The present invention relates to a method for the production of fossil-free coke from lignin comprising the steps of providing lignin, subjecting the lignin to increased pressure, subjecting the lignin to increased temperature, whereby a combination of increased pressure and temperature releases volatile organic compounds (VOCs), and recovering coke. The present invention relates also to an apparatus (1000) for the production of fossil-free coke from lignin, a use of the apparatus (1000), and the coke obtainable by the method.
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
C10L 9/08 - Treating solid fuels to improve their combustion by heat treatment, e.g. calcining
B30B 3/00 - Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
B30B 3/02 - Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with a fixed member
A system for decolorization of material comprising cellulose including: a purification stage for removing non-cellulosic components from cellulose in alkaline process conditions; a first decolorization stage for decolorizing the material comprising cellulose in alkaline process conditions; and a second decolorization stage for decolorizing the cellulose in alkaline process conditions; wherein the first and second decolorization stages use ozone and hydrogen peroxide; wherein the purification stage and the second decolorization stage include washing the cellulose, wherein the purification stage, the first decolorization stage and the second decolorization stage are connected to the subsequent stage by a process line for feeding the cellulose; and wherein each washing arrangement is connected to the washing arrangement of a preceding stage by a filtrate line for feeding wash filtrate of the washer of a preceding stage.
A method for controlling nitrogen flows in a pulp mill which comprises a recovery boiler, a lime kiln, a power boiler and a concentrated non-condensable gases (CNCG) incinerator and/or a wet gas sulfuric acid (WSA) plant is disclosed. Further is disclosed a system for controlling nitrogen flows in a pulp mill.
22S), ammonia, acetone, alcohols such as ethanol, extractives such as turpentine, and mixtures thereof. The method comprises the steps in temporal order of contacting the liquor with an oxidant, whereby at least a part of the sulphur compounds in the liquor are oxidized to their oxidized forms providing an oxidised liquor, and contacting the oxidised liquor with an acidifying agent, whereby ammonia present in the oxidised liquor reacts to form ammonium sulphate and provide an acidified liquor, essentially free of polymerised terpenes.
The invention relates to a method for degassing fiber suspension containing gas with a medium consistency pump (11), wherein the medium consistency pump (11) is a centrifugal pump driven by an electric motor (12) and having an impeller rotating in a pump housing (13), an inlet (14) connectable to a fibrous suspension supply line, an outlet (15) connectable to a fibrous suspension discharge line, and at least one degassing channel (16) for discharging gas from the medium consistency pump (11). In the method according to the invention the medium consistency pump (11) is controlled by a controller (17) controlling the degassing differential pressure level based on the operation point of the medium consistency pump's (11) theoretical position on its pump curve. The invention relates also to an apparatus (10) for degassing fiber suspension containing gas.
F04D 7/04 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogeneous
The invention relates to a device (10) for providing air into a combustion furnace (18) which device (10) comprises a casing (11) encapsulating a distributing chamber (20) and a feeding duct (21) extending outwards from the distributing chamber (20); an inlet (12) for receiving air into the distributing chamber (20) from an air source; an outlet (13) at the end of the feeding duct (21) for exiting air out from inside the casing (11); an inlet valve (19) arranged at the inlet (12) and being adjustable to control air entering through the inlet (12) into the distributing chamber (20); a damper (14) being arranged inside the feeding duct (21) and being movable from a restricted position to an open position or therebetween to adjust the flow of air exiting through the outlet (13). In the device (10) according to the invention the damper (14) comprises a first restricting element (15a) and a second restricting element (15b) arranged one on the other at a distance from each other inside the feeding duct (21) such that at least portion of the air coming from the distribution chamber (20) to the feeding duct (21) can flow to the outlet (13) through a gap (GP) between the first restricting element (15a) and the second restricting element (15b). The invention relates also to a combustion furnace (18) and a method for providing air into a combustion furnace (18).
A method for controlling a gas flow separated from a suspension of medium consistency pulp. The pulp is treated in a pulp treatment apparatus including a first pump and a second pump, wherein the second pump is a degassing centrifugal pump provided with a degassing system which includes a degassing conduit in which a degassing valve is arranged for regulating a pressure difference between an inlet of the second pump and the degassing conduit. The degassing system also includes a pressurized degassing vessel working under overpressure and having an inlet and an outlet, wherein the outlet of the vessel is connected to a pressure control valve for maintaining a desired overpressure in the vessel.
F04D 7/04 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogeneous
A process, and a system configured to perform the process, is provided wherein lignin is oxidized into methanol by feeding into a black liquor containing feedstock an oxidative agent in a reactor. The process includes: providing a feedstock comprising black liquor; preconditioning the feedstock in a preconditioning reactor; transferring the feedstock or the preconditioned feedstock to a second reactor; and feeding into the second reactor a first oxidative agent to produce a reaction mixture to oxidize methoxyl groups of lignin present in the black liquor into methanol.
C07C 29/50 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
9.
A METHOD FOR TREATING LIME MUD IN A LIME KILN, A LIME KILN FEED HEAD AND A LIME KILN
The invention relates to a method for treating lime mud in a lime kiln (2) wherein the lime kiln (2) comprises a rotary kiln shell (10) having an interior space (8) between a first end wall (6) and a second end wall (11), and wherein the first 5 end wall (6) of the lime kiln (2) comprises a moving wall-part (6a) that rotates with the rotary kiln cell (10) and a stationary wall-part (6b), and wherein the method comprises method steps of: -feeding lime mud into the interior space (8) of the rotary 10 kiln shell (10) or in close proximity to the rotary kiln shell (10) by a feeding device (1) at the first end wall (7), -entraining the lime mud in flue gas flowing out from the interior space (8) of the rotary kiln shell (10) to a separating device (4) through a flue gas riser duct (3), 15 -pretreating the lime mud while the lime mud is entrained with the flue gas stream, -separating the pretreated lime mud from the flue gas stream by the separating device (4), -returning the separated lime mud back to the feeding 20 device (1) and to the lime kiln (2), and -calcining the separated lime mud in the lime kiln (2). In the method according to the invention the lime mud particles being sticked and/or deposited on the inner surfaces of the lime kiln (2) are detached at least partly 25 from inner surfaces of at least the stationary wall-part (6b) of the first end wall (6) by a cleaning device (13) provided at the lime kiln feed end (20). The invention relates also to a lime kiln feed head (20) and a lime kiln (2).
The invention relates to a method for removing lime mud depositions (30) from internal surfaces (10a) of a rotary lime kiln (10), wherein the lime mud is lime mud formed in pulp production and in which rotary lime kiln (10) the lime mud is heated in the interior space of the rotary lime kiln (10) with an internal heater to calcinate the lime mud, and wherein the method comprises method steps of -providing an external temperature control arrangement (20) being capable to change the internal surface temperature of the rotary lime kiln (10) at least in one location from outside the interior space (12) of the rotary lime kiln (10), -changing the internal surface temperature of the rotary lime kiln (10) at least in one location by the external temperature control arrangement (20) to remove lime mud depositions (30) from the internal surface (10a) at the at least one location, -increasing the temperature at the internal surface at least to 800°C, preferably at least to 900 °C. The invention relates also to an apparatus for removing lime mud depositions (30) from internal surfaces (10a) of a rotary lime kiln (10).
A process, and a system configured to perform the process, is provided which oxidizes lignin present in filtrates into methanol by feeding into a lignin-containing feedstock an oxidative agent in a reactor. The process includes: providing, in a reactor, a feedstock comprising lignin in an aqueous medium; feeding into the feedstock at least one oxidative agent to produce a reaction mixture in which methoxyl groups of the lignin are oxidized into methanol; adjusting the pH of the reaction mixture to a value in a range of 5 to 14; and operating the reactor at a temperature in a range of 50° C. to 100° C.
C07C 29/50 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
12.
ARRANGEMENT FOR INSTALLATION OF MONITORING SENSORS OF A TREATMENT VESSEL FOR LIGNOCELLULOSIC MATERIAL
An arrangement for installations of monitoring sensors of a vessel for treatment of lignocellulosic material, which vessel (1) has a central pipe (2) including at least one concentric pipe (3), mounted coaxially within the vessel (1). At least one sensor channel (4) is arranged along the outermost wall of the concentric pipe (3) of the central pipe (2) and that the at least one sensor channel (4) is connected to a cable conduit (5), which cable conduit (5) connects the exterior of the vessel (1) to the at least one sensor channel (4)) and the sensor channel (4) is several meters long and has plurality of holders (13) for sensors (11) and/or is configured to contain plurality of thermal sensors (11) with their cables (8).
A soap separation monitoring arrangement, comprising imaging means configured to image an area of interest of a surface of a liquor storage tank; illuminating means configured to illuminate the area of interest; at least one support means supporting at an end thereof an instrumentation case and configured to be releasably installed at an installation duct in a cover of a manhole on top of the liquor storage tank so that the end supporting the instrumentation case is inside the tank, wherein the imaging means and the illuminating means are positioned inside the instrumentation case of the at least one support means; wherein the instrumentation case comprises an optics element configured to provide the imaging means and illuminating means with a field of view to the area of interest; the vertical position and angle with respect to the support means of the instrumentation case is adjustable for adjusting the field of view of the imaging means; and wherein the imaging means are configured to image at least two image frames of the area of interest, wherein the area of interest comprises at least a part of the liquor storage tank and at least a part of a soap overflow channel. Also a method and a control system.
A process wherein lignin is oxidized into methanol in an air stripping column. The process includes: feeding a feedstock into the air stripping column, wherein the feedstock includes lignin such as a filtrate from a pulp mill; and feeding air into the air stripping column to oxidize methoxyl groups of the lignin into methanol.
C07C 29/48 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups
C07C 29/78 - SeparationPurificationStabilisationUse of additives by physical treatment by condensation or crystallisation
15.
AN APPARATUS FOR OPERATING A LIQUOR GUN OF A RECOVERY BOILER, A RECOVERY BOILER AND A METHOD OF OPERATING THE APPARATUS
The invention relates to an apparatus for operating a liquor gun (20) of a recovery boiler (100), wherein the apparatus comprises liquor burner rack (10) comprising -a base (11) -a frame (12) attached movably on a base (11 ) being provided outside a recovery boiler (100) such that the frame (12) is movable back and forth along the base (11) in a direction towards a liquor gun opening (101) at a wall (102) of the recovery boiler (100), -a holder (13) for holding a liquor gun (20) within the frame (12), and attached upwards and downwards movable at the frame (12) and rotatable in respect of a tilting axis (TX) being perpendicular to the directions of the back-and-forth movements of the frame (12) and the holder (13), -an entering element (14) being arranged to move the frame (12) back and forth along the base (11) such that at least part of the liquor gun (20) hold by the holder (13) is movable into and out from the recovery boiler (100) through the liquor gun opening (101), -a lifting element (15) arranged to lift and lower the holder (13) in respect of the frame (12), and -a tilting element (16) arranged to tilt the holder (13) in respect of the tilting axis (TX), and wherein the apparatus further comprises a hatch (103) arranged at the recovery boiler (100) liquor gun opening (101) and arranged to be closed and opened by a hatch actuator (104). In the apparatus according to the invention the hatch actuator (104) is arranged to open and close the hatch (103) automatically according to movements of the frame (12) of the liquor gun rack (10) such that when the frame (12) is moved towards the liquor gun opening (101) the hatch (102) is opened and when the frame (12) is moved away from the liquor gun opening (101 ) the hatch (103) is closed. The invention relates also to a recovery boiler (100) and a method of operating the apparatus.
F23C 5/06 - Provision for adjustment of burner position during operation
F23D 11/02 - Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the combustion space being a chamber substantially at atmospheric pressure
F23G 7/04 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of waste liquors, e.g. sulfite liquors
The invention relates to a method of controlling a maintenance operation apparatus (10) of a recovery boiler (11) to carry out maintenance operation for an at least one maintenance object (S1-S14) at a recovery boiler (11) wherein the maintenance operation apparatus (10) comprises a maintenance tool (13) and a tool moving device (R1-R5) for moving the maintenance tool (13) to accomplish the maintenance operation, and wherein the method comprises method steps of a) defining a position of a fixed world coordinate system (20) at the recovery boiler (11), b) defining a position of an initial base coordinate system (21) of the at least one maintenance object (12) that is at a chosen point of the at least one maintenance object (S1-S14) determined in the fixed world coordinate system (20) in an initial temperature of the recovery boiler (11), c) defining a position of a corrected base coordinate system (22) of the at least one maintenance object (S1-S14) in the fixed world coordinate system (20) that is at the position of the chosen point in the fixed world coordinate system (20) in a transited temperature of the recovery boiler, (11), d) controlling the tool moving device (R1-R5) to carry out the maintenance operation of the at least one maintenance object (S1-S14) in the corrected base coordinate system (22). The invention relates also to a maintenance operation apparatus (10).
F16J 15/3284 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structureSelection of materials
F16J 15/3296 - Arrangements for monitoring the condition or operation of elastic sealingsArrangements for control of elastic sealings, e.g. of their geometry or stiffness
G01M 3/28 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for valves
A separator (1) of a boiler drum for separating steam and water, which separator (1) has a separating chamber (5) having a fluid inlet (2) at the bottom of the separating chamber (5) and a steam outlet (3) at the top of the separating chamber (5) and spiral vanes (9) are attached to the wall (6) of the separating chamber (5) between the fluid inlet (2) and the steam outlet (3) for accomplishing circular motion of the incoming fluids and wherein a circular water outlet (4) surrounds the steam outlet (3). Top end (8) of the wall (6) of the separating chamber (5) within the water outlet (4) has a rounded top contour for ensuring smooth flow and keeping a water trap (13) filled up at the top art of the water outlet (4) and is inclined inwards. The inclination at the top end (8) of the wall (6) is concave.
An accept tank arrangement for mixing of pulped fiber suspension including sidewalls (3,4) including opposite arched ends (2) and an elongated section (1) between the arched ends (2). The accept tank has mixers (10) each located within one of the arched ends (2). The mixers (10) have axles (11) on which are mounted propellers (12). The mixers (10) are aligned horizontally and each axle points to a respective point on the elongated section (1) of the sidewall (3) which away from an end of the elongate section by at least 25% of the length of the elongated section (1). The propellers (12) are symmetrically positioned with respect to a center-point of the accept tank. Within the center of the elongated section is an elongated centerpiece (6) having rounded ends. The accept tank has a substantially flat bottom at least at the elongated section (1) of the accept tank.
B01F 27/71 - Mixers with rotary stirring devices in fixed receptaclesKneaders with stirrers rotating about a horizontal or inclined axis with propellers
The present invention relates to method for lowering emissions of a recovery boiler comprising the steps of spraying black liquor into a boiler furnace, combusting the sprayed black liquor within the boiler furnace generating steam by cooling flue gases of the combusted black liquor by passing the flue gases through heat exchangers, removing particles from the cooled flue gases with at least one electrostatic precipitator, passing the flue gases through at least one baghouse filter, removing further particles from the flue gases with bags in the at least one baghouse filter, and lowering emissions of the flue gases in an SCR catalyst phase.
A method for preparing microcrystalline cellulose (MCC) including: acid hydrolysis of a pulp mixture in at least one reactor to obtain a hydrolyzed process mixture, and mixing the hydrolyzed process mixture to form the MCC in the at least one reactor during the acid hydrolysis, wherein the mixing is performed with an energy dissipation around 1.0×106 W/m3 to 15.0×106 W/m3 and wherein a period of the mixing is in a range of 5 s to 180 s, and the MCC has an a to d ratio less than 6.0.
A SAMPLING TOOL FOR SAMPLING REBURNED LIME FROM A LIME KILN, AND AN APPARATUS AND A METHOD FOR DETERMINING AMOUNT OF RESIDUAL CARBONATE IN REBURNED LIME SAMPLED FROM A LIME KILN
The invention relates to a sampling tool (10) for sampling reburned lime from a lime kiln, comprising a holding device (11) for holding the sampling tool (10) in the lime kiln during the sampling, and a preparation compartment (12) having a sample inlet (13) for receiving a sample from the lime kiln into the preparation compartment (12), a sample outlet (14) for unloading the sample out from the preparation compartment (12), a sieving arrangement (15) for limiting the particle size range of the sample. The invention relates also to an apparatus and method for determining amount of residual carbonate in reburned lime sampled from a lime kiln.
A screen assembly for a pulp treatment vessel, the screen assembly includes a screen plate disposed substantially parallel to an inner wall of the pulp treatment vessel and having a plurality of openings configured to pass liquor from a pulping process while preventing passage of pulp; and a support structure including an inclined support plate disposed between the inner wall of the pulp treatment vessel and the screen plate, the inclined support plate being inclined at an acute angle with respect to the screen plate from an upper portion of the screen plate to a lower portion of the screen plate; and multiple of support beams disposed on the inclined support plate, the multiple support beams extending between the inner wall of the pulp treatment vessel and the screen plate.
A system for decolorization of material comprising cellulose, the system comprising: a purification stage for removing non-cellulosic components from the material comprising cellulose in alkaline process conditions; followed by a first decolorization stage for decolorizing the material comprising cellulose in alkaline process conditions; and a second decolorization stage for decolorizing the material comprising cellulose in alkaline process conditions; wherein the first and second decolorization stage comprise a decolorization stage using ozone and a decolorization stage using hydrogen peroxide; at least the purification stage and the second decolorization stage comprise a washing arrangement comprising at least one washer for washing the material treated in said stage; each of the purification stage, the first decolorization stage and the second decolorization stage are connected to the subsequent stage by a process line for feeding the material treated and washed in said stage to the subsequent stage; and wherein each washing arrangement is connected to the washing arrangement of a preceding stage by a filtrate line for feeding at least a part of the wash filtrate of the at least one washer of said washing arrangement to a preceding stage for use as wash water.
A method for monitoring a flame of a burner of a lime kiln, including imaging a video stream showing the burner end of the lime kiln; extracting at least one image from the imaged video stream; determining, using a pretrained algorithm, from the at least one image at least one area of interest, wherein the at least one area of interest includes a part of the at least one image showing an area having at least one characteristic portion of the flame and/or burner end; calculating the area of the at least one characteristic portion based on the pixels of the at least one area of interest; and determining at least one quantity of interest based on the calculated area of the at least one characteristic portion.
A method for reducing the viscosity of dissolving pulp is disclosed. The method for reducing the viscosity of dissolving pulp comprises: a) producing cellulose pulp by a kraft cooking with a prehydrolysis step or a soda cooking with a prehydrolysis step, wherein the obtained cellulose pulp has a cellulose content of at least 88%, b) bleaching the obtained cellulose pulp, wherein the bleaching comprises at least one acidic peroxide stage, wherein the cellulose pulp is treated with a mineral acid and a hydrogen peroxide, and at least one other bleaching stage.
An arrangement for measuring the distance between at least one seal bar (20) and a rotating drum (10) of a drum displacement washer, including at least one sensor element (30) positioned inside the rotating drum (10) and configured to provide a signal indicative of the distance between the outer surface of the rotating drum (10) and the at least one seal bar (20); and a signal transfer element (50) configured to transfer the signal outside the rotating drum (10).
F16J 15/3296 - Arrangements for monitoring the condition or operation of elastic sealingsArrangements for control of elastic sealings, e.g. of their geometry or stiffness
A method of purifying raw methanol obtained in chemical pulping, wherein heavy oil is admixed with the raw methanol to prevent precipitation, and the methanol mixture is distilled or evaporated to recover the methanol. The heavy oil is formed by mixing and heating raw methanol obtained from a side stream of chemical hardwood pulping with an acidic aqueous solution to vaporize low boiling point sulfurous compounds and provide acidified raw methanol. The acidified raw methanol is separated into a liquid top phase, a liquid aqueous middle phase, and a liquid bottom phase. The liquid bottom phase is extracted to obtain the heavy oil.
A sealing arrangement of a protruding bar of a boiler and a method for operating the sealing arrangement, wherein a protruding bar (1) is arranged to enter into a combustion chamber (3) of the boiler through an opening (5) of a wall (4) of the combustion chamber (3) and the protruding bar (1) is attached to a handling device (10). The sealing arrangement has a gasket (2) for sealing the opening (5). The gasket (2) is slidably arranged around the protruding bar (1) for sealing a gap between the protruding bar (1) and the wall (4) of the combustion chamber so that sealing arrangement is configured to keep the gasket (2) attached to the wall (4) of the combustion chamber (3) while the protruding bar (1) is fully inserted into the combustion chamber (3) and at least a part of time when the protruding bar (1) enters into the combustion chamber (3) and at least a part of time when the protruding bar (1) retracts from the combustion chamber (3). The gasket (2) may be attached to the wall (4) of the combustion chamber (3) by at least one magnet (8) attached to the gasket (2) or fastening elements (13) or a spring (15) on the protruding bar (1).
A process, and a system configured to perform the process, is provided which oxidizes lignin present in filtrates into methanol by feeding into a lignin-containing feedstock an oxidative agent in a reactor.
C07C 29/50 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
A process, and a system configured to perform the process, is provided wherein lignin is oxidized into methanol by feeding into a black liquor containing feedstock an oxidative agent in a reactor.
C07C 29/50 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
A process, and a system configured to perform the process, is provided wherein lignin is oxidized into methanol in an air stripping column by feeding into the air stripping column a feedstock containing lignin, and by oxidizing the lignin into methanol by using an oxidative agent.
C07C 29/50 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups with molecular oxygen only
A method for reducing combustion temperature and/or thermal radiation within a lime kiln of a pulp production plant, which kiln is a rotary kiln having a kiln tube (1) internally covered with refractory tiles (13) and having a burner (2) supplied by fuel for heating of the rotary kiln by a flame (3). The effects are achieved by supplying calcium carbonate containing particles to the flame (3) and/or to surrounding area around the flame (3). The particles are supplied into the rotary kiln by at least one lance (9) to the upper part of the flame (3). Calcium oxide containing particles may be supplied to the rotary kiln to areas surrounding the flame (3) for reducing the thermal radiation to an area over the flame (3) and/or to the area at the side of the flame (3), where the refractory tiles (13) of the kiln are rotating downwards.
A sealing arrangement for detecting thickness (t) of a sealing element (2) of a seal (1) wherein the sealing surface (3) at frontside of the sealing element (2) is arranged to be in sliding contact with sealed surface (4), wherein at least one sensor (5) measures the thickness of the sealing element (2) and is mounted to the surrounding component (10) of the sealed surface (4). The sensor (5) is positioned opposite the sealing element (2). The sensor (5) receives a response from a transverse border of the sealing element (2) or from an electrically conductive insert (6) or from an insert (6) of magnetic material, which insert (6) is embedded within the sealing element (2) or is connected to the backside of the sealing element (2). The thickness (t) is detected and/or measured along the length of the sealing element (2).
F16J 15/3296 - Arrangements for monitoring the condition or operation of elastic sealingsArrangements for control of elastic sealings, e.g. of their geometry or stiffness
F16J 15/3212 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs
G01B 7/06 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness for measuring thickness
G01B 15/02 - Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Dissolving pulp (DP) or kraft pulp is produced at a pulp mill, and the DP or kraft pulp is activated. The activated pulp is reacted with urea to produce cellulose carbamate whereby ammonia is released. The cellulose carbamate production is integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.
According to an example aspect of the present invention, there is provided a method of removing volatile compounds from a lignin-containing material, the method comprising: providing a material comprising lignin and volatile compounds; treating the material by a distillation method in order to vaporize at least a part of the volatile compounds.
A sealing arrangement (100) for a shaft, comprising at least a first seal element (10a) arranged around the shaft (30); at least a second seal element (10b) arranged around the shaft (30); wherein the first (10a) and second (10b) seal element comprise adjustable seal elements, wherein the first (10a) and second (10b) seal element comprise, respectively, an outer shell (14a,14b) of elastic material and a hollow core (12a,12b), wherein the hollow core (12a,12b) of the first (10a) and/or the second (10b) seal element is pressurized with a fluid for an adjustable sealing effect.
B01D 46/10 - Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
B60L 1/00 - Supplying electric power to auxiliary equipment of electrically-propelled vehicles
F16J 15/3296 - Arrangements for monitoring the condition or operation of elastic sealingsArrangements for control of elastic sealings, e.g. of their geometry or stiffness
F16J 15/46 - Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
G01M 3/32 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
A system for automatic monitoring of smelt flow exiting a recovery boiler based on optical information. A processor is used to read at least one stationarily imaged video sequence, comprising digital image frames, including an area under examination representing at least part of the smelt flow exiting the recovery boiler. The processor is used to identify, in the area under examination, an area distinguishable based on colour and/or intensity information. The processor is used to determine, based on the identified distinguishable area, a monitored flow property of the smelt flow.
F23G 7/04 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of waste liquors, e.g. sulfite liquors
F27D 21/00 - Arrangement of monitoring devicesArrangement of safety devices
G01F 1/002 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
G01F 1/7086 - Measuring the time taken to traverse a fixed distance using optical detecting arrangements
G01F 1/86 - Indirect mass flowmeters, e.g. measuring volume flow and density, temperature, or pressure
The invention is an accept tank arrangement for mixing of pulped fiber suspension without causing precipitation or accumulations to the bottom tank. The accept tank has sidewalls (3,4) which have a form of two opposite arched ends (2) and an elongated section (1) between the arched ends (2). The accept tank has at least two mixers (10), and at least one of the mixers (10) are located within the arched end (2). The mixers (10) have propellers (12) at ends of their axles (11). For best performance at least two of the axles (11) of the mixers (10) are horizontally aligned to the direction of the elongated section (1) and the center line of at least one axle (11) of the mixer (10) is aimed at a point, which is at the sidewall (3) of the elongated section (1) at least 25% of the length of the elongated section (1) away from the beginning of the elongated section (1). Preferably the propellers (12) are positioned and/or aligned symmetric with respect to the centerpoint of the accept tank. Within the center of the elongated section is an elongated centerpiece (6) having rounded ends. The accept tank has a substantially flat bottom at least at the elongated section (1) of the accept tank.
B01F 27/71 - Mixers with rotary stirring devices in fixed receptaclesKneaders with stirrers rotating about a horizontal or inclined axis with propellers
A method for measuring mass changes of a heat exchanger bank (1, 2, 3) or the heat exchangers thereof of a steam boiler, which heat exchanger (4) is supported by hanger rods (7) to support beams (5,8) above the steam boiler, wherein at least one hanger rod (7) of at least one heat exchanger (4) is connected a lower measuring element (9) and an upper measuring element (10), and the changes of the measuring length (X) between the measuring elements (9, 10) is measured by a measuring instrument (15) connected between the measuring elements (9, 10) for measuring the mass changes of the heat exchanger (4). The measuring instrument (15) may be attached in between the measuring elements (9, 10) and the change in the measuring length (X) is measured by the deformation of the measuring instrument (15). A connecting member (11) parallel to the hanger rod (7) may be located between the measuring elements (9, 10), which connecting member (11) relays the change in the length to the measuring instrument (15). An elastic member (16) may be attached between the measuring element (9) and the upper measuring element (10).
F22B 37/56 - Boiler-cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
F22B 37/24 - Supporting, suspending or setting arrangements, e.g. heat shielding
F22B 37/48 - Devices or arrangements for removing water, minerals or sludge from boilers
F28F 19/00 - Preventing the formation of deposits or corrosion, e.g. by using filters
F28G 15/00 - CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS Details
G01G 19/18 - Weighing apparatus or methods adapted for special purposes not provided for in groups for weighing suspended loads having electrical weight-sensitive devices
G01L 1/10 - Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
G01L 1/22 - Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluidsMeasuring force or stress, in general by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
48.
SYSTEM AND METHOD FOR PRODUCING MICROCRYSTALLINE CELLULOSE
A system for producing microcrystalline cellulose (MCC) is disclosed. A system providing a new way for producing MCC by using mixing in a two stage reactor system enabling adjustment of product average particle size and particle size distribution is further disclosed.
A microcrystalline cellulose (MCC) product is disclosed. The use of a MCC product in pharmaceutical applications, cosmetics, food and beverage applications, or any combination thereof is further disclosed.
A separator (1) of a boiler drum for separating steam and water, which separator (1) has a separating chamber (5) having a fluid inlet (2) at the bottom of the separating chamber (5) and a steam outlet (3) at the top of the separating chamber (5) and spiral vanes (9) are attached to the wall (6) of the separating chamber (5) between the fluid inlet (2) and the steam outlet (3) for accomplishing circular motion of the incoming fluids and wherein a circular water outlet (4) surrounds the steam outlet (3). Top end (8) of the wall (6) of the separating chamber (5) within the water outlet (4) has a rounded top contour for ensuring smooth flow and keeping a water trap (13) filled up at the top art of the water outlet (4) and it is preferably inclined inwards. The inclination at the top end (8) of the wall (6) is preferably concave.
A method and system to determine one or more proportional particle group shares in flue gas of a recovery boiler (110) based on optical information gained from a flue gas sample. A processor (202) is used to read (301) a digital frame comprising the area under consideration, which represents at least a part of the surface of a sampler (120) kept in the flue gas flow of a recovery boiler. Particle group areas matching a color characteristic of the particle group comprised in the flue gas is determined (302) from the area under consideration. The joint area of the identified particle group areas is determined (304), and the share of the joint area from the total area is determined (305) as the proportional particle group share of the particle group.
A method to determine a reduction rate of a recovery boiler using optical information from a chemical smelt sample. A processor is used to read a digital frame at least part of which represents the chemical smelt sample of the recovery boiler. An area of interest is determined from the digital frame read comprising at least part of the area in the digital frame representing the chemical smelt sample. Of the pixel values of the area of interest, one or more spectral characteristic values correlating with the change of reduction rate are determined. The reduction rate of the recovery boiler is determined using a reduction rate function of one or more of the determined spectral characteristic values weighted at predetermined weights.
D21C 11/10 - Concentrating spent liquor by evaporation
F23N 1/04 - Regulating fuel supply conjointly with air supply and with draught
F23N 5/08 - Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
G01N 21/25 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
53.
METHOD AND SYSTEM FOR FLAME MONITORING AND CONTROL
A method for monitoring a flame of a burner of a lime kiln, comprising imaging a video stream showing the burner end of the lime kiln; extracting at least one image from the imaged video stream; determining, using a pretrained algorithm, from the at least one image at least one area of interest, wherein the at least one area of interest comprises a part of the at least one image showing an area comprising at least one characteristic portion of the flame and/or burner end; calculating the area of the at least one characteristic portion based on the pixels of the at least one area of interest; and determining at least one quantity of interest based on the calculated area of the at least one characteristic portion.
A centrifugal cleaner with a reject chamber (1) having a center dilution arrangement (3) with a dilution nozzle (4) to deliver dilution fluid to the reject chamber (1), and a reject outlet (7) at the bottom of the reject chamber (1). The dilution nozzle (4) points outwards to create a crossing outward flow of dilution fluid across an annular space (5) around the dilution arrangement (3) to slow circulating fluid flowing down from a cone (2) of the centrifugal cleaner to the reject chamber (1). The dilution arrangement (3) may have a clearing nozzle (6), directed against the reject outlet (7). The dilution nozzle (4) may be pointed below the bottom end (9) of the cone (2) and the dilution arrangement (3) may not extend higher than the bottom end of the cone.
A method and system for control of flows of in a pulp mill, comprising storing pulp from fiberline in a first pulp tower (10); directing the pulp from the first pulp tower (10) to pulp drying; storing white water from the pulp drying into a first water tower (30) and directing the water therefrom back to the fiberline; and when the fiberline is not able to receive the white water from the first water tower (30), directing the white water to second pulp tower (10) comprising pulp with such consistency that the white water and the pulp remain substantially separated in different layers in the second pulp tower (20).
According to an example aspect of the present invention, there is provided a method for producing an oxidised lignin based high performance surface active agent in techno-economically feasible manner within kraft pulp mill without interfering the main process.
According to an example aspect of the present invention, there is provided a method of replacing with sodium make-up chemicals sodium losses caused by outflows in a pulp mill which employs a kraft process for producing cellulosic pulp, wherein the pulp mill includes a unit for conversion of sulphurous compounds, which is fed with sulphurous substances of the kraft process to convert said sulphurous substances into oxidized sulphurous compounds, said method comprising using sodium sulphate possibly together with other sodium salts as the main make-up chemical, to achieve an essentially sodium hydroxide free feed of sodium make-up chemicals, and at least a part of the sulphur contained in the sodium sulphate make-up chemical being used for producing oxidized sulphurous compounds in said unit for conversion of sulphurous compounds.
An arrangement for measuring the distance between at least one seal bar (20) and a rotating drum (10) of a drum displacement washer, comprising at least one sensor element (30) positioned inside the rotating drum (10) and configured to provide a signal indicative of the distance between the outer surface of the rotating drum (10) and the at least one seal bar (20); and a signal transfer element (50) configured to transfer the signal outside the rotating drum (10).
An arrangement and a method for controlling a gas flow separated from a suspension of medium consistency pulp. The pulp is treated in a pulp treatment apparatus including a first pump and a second pump, wherein the second pump is a degassing centrifugal pump provided with a degassing system including a degassing conduit in which a degassing valve is arranged for regulating a pressure difference between an inlet of the second pump and the degassing conduit. The degassing system further includes a pressurized degassing vessel working under overpressure and having an inlet and an outlet, wherein the outlet of the vessel is connected to a pressure control valve for maintaining a desired overpressure in the vessel.
F04D 7/04 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogeneous
An arrangement for installations of monitoring sensors of a vessel for treatment of lignocellulosic material, which vessel (1) has a central pipe (2) including at least one concentric pipe (3), mounted coaxially within the vessel (1). At least one sensor channel (4) is arranged along the outermost wall of the concentric pipe (3) of the central pipe (2) and that the at least one sensor channel (4) is connected to a cable conduit (5), which cable conduit (5) connects the exterior of the vessel (1) to the at least one sensor channel (4)) and the sensor channel (4) is several meters long and has plurality of holders (13) for sensors (11) and/or is configured to contain plurality of thermal sensors (11) with their cables (8).
The present disclosure provides a method of purifying raw methanol obtained in chemical pulping, wherein heavy oil is admixed with the raw methanol to prevent precipitation, and the methanol mixture is distilled or evaporated to recover the methanol.
A method for feeding a slurry of chips and liquid to a prehydrolysis reactor in the production of dissolving pulp. The slurry is pumped by using at least one pump to the reactor, and alkali is fed into the at least one pump 5 for adjusting the pH of the slurry to a range of 7-10.
09 - Scientific and electric apparatus and instruments
37 - Construction and mining; installation and repair services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Cranes Machine control software, namely, downloadable software for controlling communication between computers and automated machine systems; Automatic control apparatus and instruments, namely, laser scanners, cameras, electric sensors and computers Maintenance and repair of cranes Providing temporary use of non-downloadable machine control software for controlling communication between computers and automated machine systems
The present invention relates to a process for producing cellulose carbamate (CCA). A mixture of cellulose, liquid and urea is subjected to drying and heating to complete the carbamation reaction between cellulose and urea to produce cellulose carbamate and released ammonia in a fluidized bed. The mixture is introduced into a fluidized bed drying chamber; a stream of hot gaseous medium is introduced into the chamber to effect fluidization of the mixture in order to dry and heat the mixture, whereafter a stream of gaseous medium containing ammonia and the produced cellulose carbamate are removed from the fluidized bed drying chamber.
A method for reducing combustion temperature and/or thermal radiation within a lime kiln of a pulp production plant, which kiln is a rotary kiln having a kiln tube (1) internally covered with refractory tiles (13) and having a burner (2) supplied by fuel for heating of the rotary kiln by a flame (3). The effects are achieved by supplying calcium carbonate containing particles to the flame (3) and/or to surrounding area around the flame (3). Preferably the particles are supplied into the rotary kiln by at least one lance (9) to the upper part of the flame (3). Calcium oxide containing particles may be supplied to the rotary kiln to areas surrounding the flame (3) for reducing the thermal radiation, preferably to area over the flame (3) and/or to the area at the side of the flame (3), where the refractory tiles (13) of the kiln are rotating downwards.
A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Microcrystalline cellulose is produced from chemical pulp produced at a pulp mill, such that the chemical pulp is subjected to acid hydrolysis at an elevated temperature to form microcrystalline cellulose (MCC) and hydrolysate, and the MCC is reacted with urea to produce cellulose carbamate whereby ammonia is released. The microcrystalline cellulose production and the cellulose carbamate production are integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.
C08B 15/06 - Derivatives containing elements other than carbon, hydrogen, oxygen, halogen, or sulfur containing nitrogen
C07C 273/04 - Preparation of urea or its derivatives, i.e. compounds containing any of the groups the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds from carbon dioxide and ammonia
According to an example aspect of the present invention, there is provided a method of removing volatile compounds from a lignin-containing material, the method comprising: providing a material comprising lignin and volatile compounds; treating the material by a distillation method in order to vaporize at least a part of the volatile compounds.
A sealing arrangement for detecting thickness (t) of a sealing element (2) of a seal (1) wherein the sealing surface (3) at frontside of the sealing element (2) is arranged to be in sliding contact with sealed surface (4), wherein at least one sensor (5) for measuring the thickness of the sealing element (2) is mounted to the surrounding component (10) of the sealed surface (4) and the sensor (5) is positioned opposite to the sealing element (2). The sensor (5) is capable for receiving a response from a transverse border of the sealing element (2) or from an electrically conductive insert (6) or from an insert (6) of magnetic material, which insert (6) is embedded within the sealing element (2) or is connected to the backside of the sealing element (2). By the arrangement, the thickness (t) can be detected and/or measured along the length of the sealing element (2).
F16J 15/3296 - Arrangements for monitoring the condition or operation of elastic sealingsArrangements for control of elastic sealings, e.g. of their geometry or stiffness
F16J 15/3212 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs
F16J 15/3216 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction parallel to the surfaces
F16J 15/322 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction perpendicular to the surfaces
F16J 15/34 - Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
G01M 3/16 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
G01M 3/18 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for valves
F16J 15/3204 - Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
The present invention relates to a method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Dissolving pulp (DP) or kraft pulp is produced at a pulp mill, and the DP or kraft pulp is activated. The activated pulp is reacted with urea to produce cellulose carbamate whereby ammonia is released. The cellulose carbamate production is integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.
A process for producing microcrystalline cellulose from fibrous cellulosic material by acid hydrolysis at an MCC plant. In this process a suspension of cellulosic pulp is thickened, so that filtrate is formed. A consistency of the thickened suspension is adjusted to 5-40% by adding dilution liquid, and the pH of the suspension is adjusted to a value of 4 or less with acid. The pulp suspension is subjected to acid hydrolysis of at least 120° C. in a reactor to produce a mixture of microcrystalline cellulose and hydrolysate. The mixture is discharged from the reactor to a lower pressure and lower temperature to flash the mixture and generate flash steam. Microcrystalline cellulose is separated from hydrolysate. The separated cellulose is washed in one or several washing apparatuses. The consistency of the microcrystalline cellulose is increased by thickening and/or drying for further processing.
A process for producing dissolving pulp from comminuted wood-based fibrous material. The process includes the following consecutive stages: cooking comminuted fibrous material with alkaline cooking liquor in a kraft cooking process to produce pulp; treating the cooked pulp in caustic extraction at a temperature of 70-110° C. and in an effective alkali concentration of 60-120 g/l for at least 5 minutes, and washing and oxygen delignifying the caustic extracted pulp.
A transmission wheel assembled of at least two segments (1) on a shaft (12), the inner arc surface (3) of which and the shaft (12) have essentially the same radius (R), and which segments' (1) outer surfaces (9) have profiled surfaces that transmit the power of the transmission wheel. Between the segments' (1) welded-together end faces (4) there are gaps on those sections of the end faces (4) that are not welded, which creates a press fit between the shaft (12) and the inner arc surface (3) of the transmission wheel. The weld connecting the transmission wheel segments' (1) end faces (4) may be incomplete, meaning that it does not reach the shaft (12).
B23P 15/14 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
F16H 55/12 - Toothed membersWorms with body or rim assembled out of detachable parts
The invention enables automatic monitoring of smelt flow exiting a recovery boiler based on optical information. A processor is used to read at least one stationarily imaged video sequence, comprising digital image frames, comprising an area under examination representing at least part of the smelt flow exiting the recovery boiler. The processor is used to identify, in the area under examination, an area distinguishable based on colour and/or intensity information. The processor is used to determine, based on the identified distinguishable area, a monitored flow property of the smelt flow.
The invention enables determining one or more proportional particle group shares in flue gas of a recovery boiler (110) based on optical information gained from a flue gas sample. A processor (202) is used to read (301) a digital frame comprising the area under consideration, which represents at least a part of the surface of a sampler (120) kept in the flue gas flow of a recovery boiler. Particle group areas matching a colour characteristic of the particle group comprised in the flue gas is determined (302) from the area under consideration. The joint area of the identified particle group areas is determined (304), and the share of the joint area from the total area is determined (305) as the proportional particle group share of the particle group.
The invention enables determining the reduction rate of a recovery boiler using optical information from a chemical smelt sample. A processor is used to read a digital frame at least part of which represents the chemical smelt sample of the recovery boiler. An area of interest is determined from the digital frame read comprising at least part of the area in the digital frame representing the chemical smelt sample. Of the pixel values of the area of interest, one or more spectral characteristic values correlating with the change of reduction rate are determined. The reduction rate of the recovery boiler is determined using a reduction rate function of one or more of the determined spectral characteristic values weighted at predetermined weights.
G01N 21/25 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01J 3/46 - Measurement of colourColour measuring devices, e.g. colorimeters
G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
78.
A METHOD AND AN ARRANGEMENT FOR MEASURING MASS CHANGES OF HEAT EXCHANGERS OF A STEAM BOILER
A method for measuring mass changes of a heat exchanger bank (1,2,3) or the heat exchangers thereof of a steam boiler, which heat exchanger (4) is supported by hanger rods (7) to support beams (5,8) above the steam boiler, characterized in that to at least one hanger rod (7) of at least one heat exchanger (4) is connected a lower measuring element (9) and an upper measuring element (10), and the changes of the measuring length (X) between the measuring elements (9, 10) is measured by a measuring instrument (15) connected between the measuring elements (9, 10) for measuring the mass changes of the heat exchanger (4). Preferably the measuring instrument (15) is attached in between the measuring elements (9, 10) and the change in the measuring length (X) is measured by the deformation of the measuring instrument (15). Preferably a connecting member (11 ) which is parallel to the hanger rod (7) is located between the measuring elements (9, 10), which connecting member (11 ) relays the change in the length to the measuring instrument (15). An elastic member (16) is attached between the measuring element (9) and the upper measuring element (10).
According to an example aspect of the present invention, there is provided a method of replacing with sodium make-up chemicals sodium losses caused by outflows in a pulp mill which employs a kraft process for producing cellulosic pulp, wherein the pulp mill includes a unit for conversion of sulphurous compounds, which is fed with sulphurous substances of the kraft process to convert said sulphurous substances into oxidized sulphurous compounds, said method comprising using sodium sulphate possibly together with other sodium salts as the main make-up chemical, to achieve an essentially sodium hydroxide free feed of sodium make-up chemicals, and at least a part of the sulphur contained in the sodium sulphate make-up chemical being used for producing oxidized sulphurous coumpounds in said unit for conversion of sulphurous compounds.
A centrifugal cleaner which has a reject chamber (1) having a dilution arrangement (3) at the center of the reject chamber (1), which dilution arrangement (3) has at least one dilution nozzle (4) for delivery of dilution fluid to the reject chamber (1) and the reject chamber (1) has a reject outlet (7) at the bottom of the reject chamber (1). The at least one dilution nozzle (4) is pointed outwards for accomplishing a crossing outward flow of dilution fluid across an annular space (5) around the dilution arrangement (3) for slowing the circulating motion of fluid flowing down from the cone (2) of the centrifugal cleaner to the reject chamber (1). Preferably the dilution arrangement (3) has a clearing nozzle (6), which is directed against the reject outlet (7) for keeping the reject outlet (7) clear of rejected particles. The at least one dilution nozzle (4) should be pointed below the bottom end (9) of the cone (2) of the centrifugal cleaner and the dilution arrangement (3) should not extend up higher than the bottom end (9) of the cone (2) of the centrifugal cleaner.
According to an example aspect of the present invention, there is provided a method for producing an oxidised lignin based high performance surface active agent in techno-economically feasible manner within kraft pulp mill without interfering the main process.
A separation device having a housing (10) with a feed conduit (1) and a reject conduit (2), between which conduits (1, 2) and an accept conduit (3) of the housing (10) is a rotor unit (13) having a shaft (4) transverse to the through-flow direction of the separation device, which shaft rotates discs (5) attached to the shaft (4), the outer surface and/or side surfaces of which discs are jagged, i.e. they have protrusions (6) and/or notches and/or these surfaces are substantially rough and the teeth (9) of at least two sieves (7, 8) attached to the housing (10), extend between the discs (5), the first sieve (7) being between the reject conduit (2) and the accept conduit (3) and the second sieve (8) being between the feed conduit (1) and the accept conduit (3).
B07B 13/00 - Grading or sorting solid materials by dry methods, not otherwise provided forSorting articles otherwise than by indirectly controlled devices
A method of treating fly ash containing sodium sulfate from a recovery boiler of a chemical pulp mill. This method includes at least the following steps: a) ash is dissolved in an aqueous solution and the pH of the solution is adjusted with alkali for precipitating impurities, b) the solution is filtered for removing the impurities containing precipitate, c) sodium sulfate is crystallized from the solution and the crystals are separated from the solution by filtering or by centrifugation, and d) the crystallized sodium sulfate is used as initial material for producing sodium and sulfur containing chemicals or as process chemical.
B01D 15/36 - Selective adsorption, e.g. chromatography characterised by the separation mechanism involving ionic interaction, e.g. ion-exchange, ion-pair, ion-suppression or ion-exclusion
A method of producing chemical pulp including at least the following steps: a) wood chips or other comminuted ligno-cellulosic fibrous material is treated with a polysulfide-containing cooking liquor in an impregnation stage at a temperature of 90-145° C., and b) slurry of fibrous material from step a) is heated into cooking temperature and cooked for producing pulp having a desired kappa number. After step a) mercaptide ions are added into the slurry of fibrous material and the fibrous material is treated at cooking temperature in step b).
The present invention relates to an arrangement and a method for controlling a gas flow separated from a suspension of medium consistency pulp. The pulp is treated in a pulp treatment apparatus comprising at least a first pump and a second pump, wherein the second pump is a degassing centrifugal pump provided with a degassing system which comprises - a degassing conduit in which a degassing valve is arranged for regulating a pressure difference between an inlet of the second pump and the degassing conduit. The degassing system further comprises a pressurized degassing vessel working under overpressure and having an inlet and an outlet, wherein the outlet of the vessel is connected to a pressure control valve for maintaining a desired overpressure in the vessel.
F04D 7/04 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogeneous
86.
AN ARRANGEMENT FOR INSTALLATION OF MONITORING SENSORS OF A TREATMENT VESSEL FOR LIGNOCELLLULOSIC MATERIAL
An arrangement for installations of monitoring sensors of a vessel 1 for treatment of lignocellulosic material, which vessel (1) has a central pipe (2) comprising at least one concentric pipe (3), which is mounted coaxially within the vessel (1).At least one sensor channel (4) is arranged along the outermost wall of the concentric pipe (3) of the central pipe (2) and that the at least one sensor channel (4) is connected to a cable conduit (5), which cable conduit (5) connects the exterior of the vessel (1) to the at least one sensor channel (4) ) and the sensor channel (4) is several meters long and has plurality of holders (13) for sensors (11) and/or is configured to contain plurality of thermal sensors (11) with their cables (8). An outer wall (6) of the sensor channel (4) may be a concentric pipe on the central pipe (2) or it is welded from both sides of the outer wall (6) onto the central pipe (2). The sensor channel (4) may contain subchannels (7). The sensor channel (4) may be pressurized and/or have means for evacuating leaked liquid from the bottom of the sensor channel (4). The sensor channel (4) may be thermally insulated from the center pipe (2).
The invention relates to a method for feeding a slurry of chips and liquid to a prehydrolysis reactor in the production of dissolving pulp. The slurry is pumped by using at least one pump to the reactor, and alkali is fed into the at least one pump 5 for adjusting the pH of the slurry to a range of 7-10.
The invention relates to a wash nozzle assembly for all types of atmospheric diffusers for washing cellulose pulp. The nozzle assembly comprises a nozzle 5 which has a wash flow controlling orifice plate or another orifice assembly, preferably located at the trailing edge of the nozzle.
4 (52) Summary The present invention relates to a method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Microcrystalline cellulose is produced from chemical pulp produced at a pulp mill, such that the chemical pulp is subjected to acid hydrolysis at an elevated temperature to form 5 microcrystalline cellulose (MCC) and hydrolysate, and the MCC is reacted with urea to produce cellulose carbamate whereby ammonia is released. The microcrystalline cellulose production and the cellulose carbamate production are integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is 10 used in the carbamate production.
A transmission wheel assembled of at least two segments (1) on a shaft (12), the inner arc surface (3) of which and the shaft (12) have essentially the same radius (R), and which segments' (1) outer surfaces (9) have profiled surfaces that transmit the power of the transmission wheel. Between the segments' (1) welded-together end faces (4) there are gaps on those sections of the end faces (4) that are not welded, which creates a press fit between the shaft (12) and the inner arc surface (3) of the transmission wheel. The weld connecting the transmission wheel segments' (1) end faces (4) is preferably incomplete, meaning that it does not reach the shaft (12).
The present invention relates to a process for producing dissolving pulp from comminuted wood-based fibrous material. The process comprises the following consecutive stages: cooking comminuted fibrous material with alkaline cooking liquor in a kraft cooking process to produce pulp; treating the cooked pulp in caustic extraction at a temperature of 70-110 °C and in an effective alkali concentration of 60-120 g/l for at least 5 minutes, and washing and oxygen delignifying the caustic extracted pulp.
The present invention relates to a process for producing microcrystalline cellulose from fibrous cellulosic material by acid hydrolysis at an MCC plant. In this process a suspension of cellulosic pulp is thickened, so that filtrate is formed. A consistency of the thickened suspension is adjusted to 5-40 % by adding dilution liquid, and the pH of the suspension is adjusted to a value of 4 or less with acid. The pulp suspension is subjected to acid hydrolysis at at least 120 °C in a reactor to produce a mixture of microcrystalline cellulose and hydrolysate. The mixture is discharged from the reactor to a lower pressure and lower temperature to flash the mixture and to generate flash steam. Microcrystalline cellulose is separated from hydrolysate, and the separated cellulose is washed in one or several washing apparatuses, and the consistency of the microcrystalline cellulose is increased by thickening for further processing or thickening and drying for further processing.
A screen assembly for a digester, impregnation vessel or other treatment vessel for separation of cooking liquor or treatment liquor from lignocellulosic material, typically in a form of chips, in the production of chemical cellulose pulp, which screen assembly includes a plurality of screen panels (17) of woven wire mesh cloth and attachment device configured to attach the screen panels to a support frame of the digester or vessel.
A method and an arrangement for generating process steam at a chemical pulp mill. Water is heated by subjecting it to an indirect heat exchange contact with steam in a heat exchanger. The water is heated with live steam produced in a steam boiler for generating process steam, whereby the live steam is condensed and the generated condensate is recovered. The process steam is subjected to a direct heat exchange contact with a material for heating the material. The water used for process steam production is obtained from secondary condensates, purified waste water and/or raw water. Process steam can be used in the treatment of cellulosic fibrous material, such as chips.
D21C 11/06 - Treatment of pulp gasesRecovery of the heat content of the gases
D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
F22B 1/12 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam produced by an indirect cyclic process
F22D 1/18 - Feed-water heaters, e.g. preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and heated indirectly
The present invention related to a method to optimise the chemical balance at a sulfate pulp mill, which produces at least pulp bleached with chlorine dioxide and has a chlorine dioxide plant using at least chlorate, methanol and sulfuric acid for making chlorine dioxide. The method comprises at least the following steps: a), gases from the mill's concentrated non-condensable gas system are incinerated in order to form a gas containing sulfur dioxide, which is treated to produce concentrated sulfuric acid, and b), raw methanol from the mill processes is purified to produce methanol, and c), side streams containing sodium compounds and/or sulfur compounds produced by mill processes are used as make-up chemicals, wherein the production of chlorine dioxide uses the sulfuric acid produced in step a) and methanol purified in step b), with a sulfuric acid concentration of 94-99%, preferably 95-98%, and using in step c) sesquisulfate or sodium sulfate produced during the production of chlorine dioxide.
01 - Chemical and biological materials for industrial, scientific and agricultural use
17 - Rubber and plastic; packing and insulating materials
22 - Rope, netting, tents, awnings, sails and sacks; padding and stuffing materials
23 - Yarns and threads for textile use
24 - Textiles and textile goods
Goods & Services
Chemical substances, chemical materials and chemical preparations, and natural elements. Regenerated fiber thread not for textile use. Raw textile fibers and substitutes. Yarns and threads. Textile goods, and substitutes for textile goods.
98.
Arrangement of heat recovery surfaces of a recovery boiler
An arrangement in a recovery boiler having a furnace for combusting waste liquor and a flue gas duct including vertical flue gas channels, at least some of which are provided with heat recovery units for recovering heat from flue gases. The first flue gas channel downstream of the furnace is provided with a reheater and one of the following heat recovery units: an economizer or a boiler bank. The reheater and the second heat recovery unit are located one after the other in the horizontal incoming direction of the flue gas, so that in a flue gas channel the flue gas flows in a vertical direction from above downwards and heats the reheater and the second heat recovery unit simultaneously. The heat recovery elements of the reheater and the second heat recovery unit may be positioned side by side in a direction that is crosswise with respect to the horizontal incoming direction of the flue gas.
F22B 21/00 - Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
F22G 7/14 - Steam superheaters characterised by location, arrangement, or disposition in water-tube boilers, e.g. between banks of water tubes
D21C 11/06 - Treatment of pulp gasesRecovery of the heat content of the gases
F22B 31/04 - Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively
F23G 7/04 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of waste liquors, e.g. sulfite liquors
A separation device having a housing (10) with a feed conduit (1 ) and a reject conduit (2), between which conduits (1, 2) and an accept conduit (3) of the housing (10) is a rotor unit (13) having a shaft (4) transverse to the through-flow direction of the separation device, which shaft rotates discs (5) attached to the shaft (4), the outer surface and/or side surfaces of which discs are jagged, i.e. they have protrusions (6) and/or notches and/or these surfaces are substantially rough and the teeth (9) of at least two sieves (7, 8) attached to the housing (10), extend between the discs (5), the first sieve (7) being between the reject conduit (2) and the accept conduit (3) and the second sieve (8) being between the feed conduit (1) and the accept conduit (3).
D21D 5/20 - Purification of the pulp suspension by mechanical meansApparatus therefor with the aid of centrifugal force in apparatus with a horizontal axis
D21B 1/02 - Pretreatment of the raw materials by physical or chemical means
B07B 1/12 - Apparatus having only parallel elements
100.
APPARATUS AND METHOD FOR CLEANING SMELT SPOUTS OF RECOVERY BOILER
An apparatus and method for cleaning smelt spouts of a recovery boiler. The invention further relates to an arrangement in the recovery boiler. The recovery boiler (1) comprises several smelt spouts (6) which are cleaned by means of motorized cleaning units (13). The cleaning units are mounted on carriers (11) for moving them between the smelt spouts. The carriers are provided with steerable moving members (12, 33) and are thereby freely steerable on a driving surface. A control system of the apparatus comprises a positioning system for guiding the carrier along an imaginary driving path to target points (TP).
