A method in a system for supporting a combustion boiler plant, and a system for supporting a combustion boiler plant. The support system (9) comprises at least: several hydraulic cylinders (13) which support at least one unit of the combustion boiler plant and keep said at least one unit at a desired height level; and a hydraulic control circuit and a control unit (24) for controlling the same, configured to control said cylinders. According to some examples, the unit is a boiler, or a boiler based on fluidized bed combustion, or the grate structure of a boiler based on fluidized bed combustion, or the furnace of a boiler based on fluidized bed combustion, or the loop seal of a circulating fluidized bed boiler. According to an embodiment, the system is particularly a system (9) for supporting the loop seal of a circulating fluidized bed boiler, keeping the loop seal at a desired height level.
F23C 10/30 - Control devices specially adapted for fluidised bed combustion apparatus for controlling the level of the bed or the amount of material in the bed
F23C 10/10 - Apparatus in which combustion takes place in a fluidised bed of fuel or other particles with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
F23C 10/28 - Control devices specially adapted for fluidised bed combustion apparatus
2.
IMPROVEMENT OF HEAT TRANSFER FROM A FLUIDIZED BED TO A HEAT EXCHANGER PIPE
The use of a heat exchanger pipe (300) in the fluidized bed of a fluidized bed boiler. The heat exchanger pipe (300) has a first dimension (dmax) in its crosssectional plane and a second dimension (dmin) in a direction transverse to the first dimension, the first dimension being greater than the second dimension. At least part of the heat exchanger pipe (300) is placed in a fluidized bed (100, 136, 133, 139, 130, 145) in such a way that the longitudinal direction of the pipe is at an angle smaller than 60 degrees to the horizontal plane. Said second dimension (dmin) is horizontal. The cross-section of the heat exchanger pipe (300) tapers towards the upper and lower edges. Furthermore, a fluidized bed boiler is presented for implementing said use. Moreover, a method is presented for heating a heat transfer fluid by a granular solid substance. In the method, a fluidized bed is formed of said solid substance in the fluidized bed boiler, and the heat exchanger pipe is used in the described manner.
F23C 10/00 - Apparatus in which combustion takes place in a fluidised bed of fuel or other particles
F28D 13/00 - Heat-exchange apparatus using a fluidised bed
F28F 1/02 - Tubular elements of cross-section which is non-circular
F28F 1/14 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
3.
A BOILER, AND A SILENCER FOR A FLUE GAS DUCT IN A BOILER
A boiler comprising a flue gas duct and heat exchanger pipes (132, 212, 262) in the flue gas duct. The boiler comprises a planar silencer plate (320), which silencer plate (320) comprises sound absorbing material, and said first silencer plate (320) being placed downstream of one of said heat exchanger pipes (132, 212, 262) in the flow direction of flue gases in said flue gas duct. Furthermore, a silencer for a flue gas duct with a rectangular cross-section in a boiler, the silencer comprising at least a first and a second planar silencer plate (320) substantially parallel to the flow direction of flue gases, the silencer plates (320) comprising sound absorbing material. The first silencer plate is placed at an angle to the second silencer plate, wherein the width of the resonating area of the flue gas duct becomes narrower in two directions transverse to the flow direction of the flue gases.
The use of a fluidized bed boiler as a heat source for a torrefaction process is presented. The fluidized bed boiler (100, 150) comprises means (210, 106, 156) for heating heat transfer medium (112, 212), means (213, 302) for transferring the heat transfer medium to a torrefaction reactor (200, 300, 400, 500), and means (215, 313) for receiving heat transfer medium from the torrefaction reactor. Furthermore, a method for torrefying biomass (202) is presented. In the method, biomass is heated to a torrefaction temperature in a torrefaction reactor by means of heat transfer medium, and the biomass is kept at the torrefaction temperature for a retention time. Further in the method, the heat transfer medium (112, 212) is heated by a fluidized bed boiler (100, 150), the heat transfer medium (112, 212) is transferred from the fluidized bed boiler (100, 150) to the torrefaction reactor (200, 300, 400, 500), and the heat transfer medium is transferred from the torrefaction reactor to the fluidized bed boiler. Furthermore, a torrefaction system is presented, which comprises a torrefaction reactor (200, 300, 400, 500) for torrefying biomass (202) into biocoal (204), means for conveying biomass to the torrefaction reactor, and heat transfer medium (112, 212) for heating the biomass. The torrefaction system further comprises a fluidized bed boiler (100, 150) for heating the heat transfer medium, means (213, 302) for conveying the heat transfer medium from the fluidized bed boiler (100, 150) to the torrefaction reactor (200, 300, 400, 500), and means (215, 313) for conveying the heat transfer medium from the torrefaction reactor to the fluidized bed boiler (100, 150). Both in the method and in the system, torrefaction gas or bed material from the fluidized bed boiler may be used as the heat transfer medium.
C10L 9/08 - Treating solid fuels to improve their combustion by heat treatment, e.g. calcining
C10B 49/04 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated
C10B 49/22 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form in dispersed form according to the "fluidised bed" technique
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
5.
A FLUE GAS AIR PREHEATER, AND A METHOD FOR INSTALLATION, AS WELL AS AN AIR PIPE COMPONENT FOR A FLUE GAS AIR PREHEATER
A flue gas air preheater and a method for the installation of air pipes for a flue gas air preheater (3), wherein a set of air pipes (7) is connected to said preheater, the method comprising: cutting an air pipe (7) connected to the preheater and detaching the portion of the air pipe (7) that is to be removed from the preheater for replacement; fitting a separate new air pipe (7a) in place of the air pipe portion to be removed; and connecting said new air pipe (7a) to the remaining portion (7b) of the air pipe (7) in a sealed manner, as an extension of it. In an example, the fixing is performed utilizing a fastening sleeve (13) fixed to the end of the new air pipe (7a) and inserting it in the remaining portion (7b) of the air pipe (7). In an example, the fixing is performed by means of a mechanical sealing solution (13d, 13f) without welding. The air pipe component for the flue gas air preheater (3) comprises: an air pipe (7a), and a fastening sleeve (13).
F28D 7/16 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
F28F 11/00 - Arrangements for sealing leaky tubes or conduits
A bag filter comprises a hole plate (4) as well as elongated filter elements (6) installed in apertures (5) of the hole plate. In a first step, a damaged filter element (6) is detected, and in a second step, a separate plugging piece (12) is fed into the aperture (5) of the hole plate that corresponds to the damaged filter element, in such a way that the plugging piece (12) blocks the flow from the filter element (6) to the outside of the aperture.
B01D 29/11 - Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
B01D 46/24 - Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
A boiler and a method in a boiler (1) producing thermal energy, the method comprising: combustion or fuel and combustion air in the furnace (2) of the boiler, delimited by walls; receiving of thermal energy by a steam superheater (15) placed on the wall of the furnace and comprising at least one heat exchange surface (21), and supplying of gas or a gas mixture to the front of said heat exchange surface to form a barrier layer (18) for protecting the heat exchange surface from flue gases (19) developed in connection with the combustion. At least one supply device (17) is provided in the superheater or in the direct vicinity of the superheater, to supply gas or a gas mixture to the front of said heat exchange surface to form a barrier layer (18) to protect the heat exchange surface from the flue gases (19) in the boiler. In one example, a supply device matrix is provided in the area delimited by the superheater.
The invention relates to a method and apparatus for processing the black liquor of a pulp mill to recover the chemicals and energy therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (6), formed gaseous components are lead for utilization, sand is returned to a fluidized-bed boiler, and solid matter is mixed with water, whereby a soda-water solution is returned to the pulping process and solid carbon to the fluidized-bed boiler (1).
A bag filter comprises a hole plate (4) as well as elongated filter elements (6) installed in apertures (5) of the hole plate. The hole plate (4) is a sheet with a sandwich structure, comprising an upper plate (8) and a lower plate (7), whose apertures (5b, 5a) are aligned for inserting filter elements (6) in the apertures (5), and reinforcements (9) are provided between the upper plate (8) and the lower plate (7), interconnecting the sheets and running between the apertures (5). The apertures (5) of the hole plate constitute cardioid strings in the plane of the hole plate.
B01D 29/11 - Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
10.
METHOD AND EQUIPMENT FOR TREATMENT OF BLACK LIQUOR AT PULP MILL
The invention relates to a method and equipment for treating pulp mill black liquor so as to recover the energy in chemicals therein. In the invention the black liquor is pyrolysed in a pyrolysis reactor (4), where causticizing material consisting of metal oxide and sodium, oxide and heated in a burning unit (6) is conveyed, and gaseous components formed in pyrolysis are conveyed for utilization and solids are returned to the burning unit.
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
F23G 5/027 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of waste or low-grade fuels including pretreatment pyrolising or gasifying
C10B 49/00 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
11.
METHOD AND ARRANGEMENT FOR OPTIMISING COMBUSTION CONDITIONS IN A FLUIDISED-BED BOILER
A method and an arrangement for optimising combustion conditions in a fluidised-bed boiler, in which combustion gas is fed at two or more height levels, the first of which is a primary level (P) which is located at the height of a furnace bottom and the second is a secondary level (S) which is located above fuel feed height (F), above which secondary level (S) there can be still other combustion gas feed levels (T,...). At least one combustion gas feed level (P, S, T,...) is fed at different points of the furnace (11) in its horizontal direction with combustion gases having different oxygen contents such that zones of different oxygen content can be formed in the horizontal direction of the furnace (11).
A flue gas air preheating apparatus (3) for combustion air in a boiler of a power plant, comprising an air pipe (7) placed in a flue gas duct (2). An air guide sleeve (8) is provided at the initial end of the air pipe (7), at least partly inside the air pipe, the air guide sleeve (8) being made of a poorly heat conductive material and designed to diminish turbulence in the air flow. The invention also relates to a method and a corrosion shield.
The invention relates to a method of carrying out pyrolysis process in a pyrolysis reactor (4) for solid fuel to produce pyrolysis oil. The method comprises supplying solid fuel into a drying zone in the pyrolysis reactor (4) for removing moisture containing gases, drying the solid fuel in the drying zone and extracting the moisture containing gases re- moved from the solid fuel out of the pyrolysis reactor (4), passing the dried solid fuel from the drying zone to the pyrolysis zone of the pyrolysis reactor (4), pyrolyzing the dried solid fuel for separating pyrolysis gases from the dried solid fuel and conducting the pyrolysis gases from the pyrolysis reactor (4) to a condenser (8) for producing pyrolysis oil.
C10B 49/22 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form in dispersed form according to the "fluidised bed" technique
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
C10B 49/16 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form
F23C 10/00 - Apparatus in which combustion takes place in a fluidised bed of fuel or other particles
A preheating device (1 ) for combustion air in a boiler, the device comprising first heat exchanger structures fitted in a flue gas duct (2), for heating primary air (P), a first air supply area (5) in the wall of the flue gas duct (2), for supplying air to be heated to the first heat exchanger structures, second heat exchanger structures fitted in a flue gas duct (2), for heating secondary air (S), as well as a second air supply area (6) in the wall of the flue gas duct (2), for supplying air to be heated to the second heat exchanger structures. The first air supply area (5) is opposite the second air supply area (6). The invention also relates to a power plant.
F28D 1/02 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with the heat-exchange conduits immersed in the body of fluid
F28D 1/047 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with the heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
15.
A METHOD FOR THE THERMAL TREATMENT OF BIOMASS IN CONNECTION WITH A BOILER PLANT
The invention relates to the improvement of the fuel-properties of biomass in an integrated manner to facilitate storage, shipping and applicability thereof. In the process, biomass (6) is thermally treated within a combustion process to cause partial torrefaction of the organic matter present in biomass, thus yielding components inert to biological decomposition processes. Constituents (10) separated in gaseous form are utilized as fuel, while the thermally treated biomass (8) remaining in the solid form is utilized in a separate process.
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
C10B 49/02 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
C10L 5/40 - Solid fuels essentially based on materials of non-mineral origin
16.
METHOD FOR REDUCING NITROGEN OXIDE EMISSIONS IN OXYFUEL COMBUSTION
A method for reducing nitrogen oxide emissions in oxyfuel combustion, which method comprises supplying in a furnace (11) of a circulating fluidised bed boiler (10) at least one primary gas flow (15) and at least one secondary gas flow (16), which both have been produced by mixing oxygen and circulated flue gas together. The oxygen content of the primary gas (15) is adjusted such that a reducing zone (I) is formed at the bottom of the furnace, in which zone nitrogen oxides are reduced to nitrogen. The oxygen content of the secondary gas is adjusted such that above the reducing zone (I) is formed an oxidising zone (II), in which zone combustion is completed.
F23C 10/04 - Apparatus in which combustion takes place in a fluidised bed of fuel or other particles with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
F23C 10/18 - Apparatus in which combustion takes place in a fluidised bed of fuel or other particles DetailsAccessories
F23L 7/00 - Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
17.
METHOD AND EQUIPMENT FOR TREATMENT OF BLACK LI QUOR AT PULP MILL
The invention relates to a method and equipment for treatment of black liquor at a pulp mill in order to recover chemicals and energy contained therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (4), the formed gaseous components are forwarded for utilization and the solids are mixed with water, whereby the formed solids are returned to a lime burning kiln (1) and the sodium-hydroxide-containing liquid is returned to the pulp cooking process.
A pyrolysis apparatus comprises a furnace (1) operating by fluidized bed combustion, a pyrolyzer (4) and flow paths, which connect the furnace (1) and the pyrolyzer (4) for arranging the circulation (C) of carrier material of the fluidized bed combustion between the furnace and the pyrolyzer .The apparatus also comprises a supply inlet (14) for supplying fuel to be pyrolyzed to the pyrolyzer (4), fluidizing gas supply means (5) arranged in the pyrolyzer for fluidizing the mixture of carrier material and fuel, and an outlet (6) for taking condensible gaseous substances separated from the fuel to be pyrolyzed out of the pyrolyzer (4), and a condenser for condensing the condensible gaseous substances. The carrier material circulation is arranged at the furnace (1) by a cocurrent principle along the flow path of hot flue gases, which comprises a separator (3) located higher than the pyrolyzer (4), which separator is arranged to separate carrier material from flue gases, while the circulation also comprises a connecting conduit (11) between the separator (3) and the pyrolyzer (4) for moving the carrier material by gravity to the pyrolyzer (4), and a return path (12) between the pyrolyzer (4) and the furnace (1) for returning the carrier material to the furnace (1). The outlet (6) is arranged in the chamber formed by the pyrolyzer (4) in its upper part in a space above the fluidized mixture of carrier material and fuel in order to remove the condensible gaseous substances from the pyrolyzer.
C10B 49/22 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form in dispersed form according to the "fluidised bed" technique
19.
Method for performing pyrolysis and a pyrolysis apparatus
A pyrolysis apparatus comprises a substantially closed pyrolyzer (4), a supply inlet for supplying pyrolyzable fuel to the pyrolyzer (4), an outlet for taking hot bed material in particle form out of the pyrolyzer, one or more exit outlets (6) for taking condensible gaseous substances separated from the fuel to be pyrolyzed out of the pyrolyzer, a condenser (8) for condensing the condensible gaseous substances into pyrolysis oil, and a line (7) for transferring the condensible gaseous substances from the exit outlet of the pyrolyzer (4) to the condenser (8). The means for maintaining pyrolysis conditions in the pyrolyzer (4) comprise an inlet for taking hot bed material in particle form into the pyrolyzer and means (5) for supplying fluidizing gas to the pyrolyzer.
The pyrolyzer (4) is a chamber bounded directly by a furnace (1) of a bubbling fluidized bed boiler, through which chamber fluidized bed material is arranged to be circulated between the inlet and the outlet. Means (5) for supplying fluidizing gas are divided over an area between the inlet (11) and the outlet (12) in the pyrolyzer (4) so that they create a cross-flow of fluidizing gas in relation to the transfer direction (S) of the bed material and fuel.
C10B 49/22 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form in dispersed form according to the "fluidised bed" technique
A method of scrubbing flue gases of two or more diesel engines and a scrubber for scrubbing flue gases of two or more diesel engines. The scrubber (1) comprises scrubbing means (3) for scrubbing the flue gases, and conduits (4) for conveying the flue gases to said scrubbing means (3) to be scrubbed in the same scrubbing process. The different flue gas flows are arranged to be conveyed in separate conduits (4) all the way to the scrubbing means (3).
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
A cleaning apparatus for a smelt spout of a recovery boiler, which apparatus comprises a motorized cleaning member (7) for cleaning the smelt spout (1). The cleaning apparatus further comprises a path (5) and a cleaning unit, which comprises motorized transfer means for transferring the cleaning unit to the location of the smelt spout (1) along the path.
A cleaning apparatus for a smelt spout of a recovery boiler, which apparatus comprises a motorized cleaning member (7) for cleaning the smelt spout (1). The cleaning apparatus further comprises a path (5) and a cleaning unit, which comprises motorized transfer means for transferring the cleaning unit to the location of the smelt spout (1) along the path.
A method and an equipment for reducing sulphur dioxide emissions of a marine engine, wherein flue gases are scrubbed with a scrubbing solution in a scrubber. Fresh water with added sulphur removal reagent is used as the scrubbing solution.
A method and an equipment for reducing sulphur dioxide emissions of a marine engine, wherein flue gases are scrubbed with a scrubbing solution in a scrubber. Fresh water with added sulphur removal reagent is used as the scrubbing solution.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
In a method for processing flue gases, flue gases from an incineration plant for non-condensable gases of a kraft pulp mill are scrubbed by means of a calcium compound. The calcium compound is lime mud taken from the chemical recirculation of the kraft pulp mill after causticization and before a lime reburning kiln, and it is used in the scrubbing of gas as a substance reacting with sulphur dioxide.
A method for improving the operation safety of the smelt spout area of a recovery boiler, which smelt spout area comprises a working area (6), as well as smelt spouts (2) connected to the lower part of the boiler for directing the smelt from the boiler to a dissolving tank (4). In the method the smelt spouts (2) are separated from the working area (6) by a shielding wall (8, 10) arranged movable in relation to the smelt spouts. The invention also relates to a smelt spout area of a recovery boiler.
The invention relates to an arrangement in a recovery boiler, into which spent liquor to be combusted and combustion air are fed, the arrangement comprising superheaters in the upper part of the recovery boiler for recovering heat. Instead of screen tubes the invention is provided with a superheater formed of horizontal elements.
A method for reducing nitrogen oxide emissions of a bubbling fluidized bed boiler burning biofuel and an air distribution system for a bubbling fluidized bed boiler biofuel. A fluidized bed (2) is arranged in the lower part of a furnace (1) of the bubbling fluidized bed boiler, which is fluidized by means of fluidizing gas, which comprises at least primary air. Fuel is fed to the fluidized bed (2), which dries and pyrolizes into pyrolysis gas comprising volatile matter of fuel, which gas rises upwards in the furnace and burns there. Secondary air is supplied above the fluidized bed (2) from secondary air nozzles (6), and tertiary air is supplied above the secondary air nozzles (6). A part of primary air is supplied in connection with fuel feeding in such a manner that the fuel is forced substantially on the surface of the fluidized bed (2), thus pyrolizing entirely, and at least a part of the pyrolysis gases formed in the pyrolysis is burnt by means of primary air in such a manner that the air coefficient in relation to the volatile matter of fuel in the pyrolysis gases is in the substoichiometric area.
F23C 10/22 - Fuel feeders specially adapted for fluidised bed combustion apparatus
F23G 7/10 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of field or garden waste
F23K 3/02 - Pneumatic feeding arrangements, i.e. by air blast
A method for reducing corrosion of a superheater (6) of a steam boiler, which superheater (6) comprises a superheater piping (7), which comprises a steam pipe (9), where the steam (S) to be superheated is directed to. The steam pipe (9) is separated by a protective shell (8), whose surface settling in the flue gas space (G) has a temperature that rises above an upper critical temperature (Tk2), above which temperature in the flue gas space the compounds from the fuel are substantially in a gaseous form. In addition, the invention relates to a superheater of a steam boiler and a circulating fluidized bed boiler.
F22B 31/00 - Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatusArrangements or dispositions of combustion apparatus
Method for treatment of spent liquor at a pulp mill, in which method at least a part of the spent liquor flow arriving from the evaporation plant is taken to a pyrolysis reactor, wherein it is pyrolysed at a temperature of 300-800° C. in order to separate evaporable compounds from the coke remaining in a solid state. The pyrolysis products, which are gases or liquids, may be used as fuel or they may be processed further. The coke resulting from the pyrolysis is burnt in a soda recovery boiler or in a gasification reactor to regenerate cooking chemicals. The method is suitable for recovery of chemicals and energy both in sulphate and sulphite processes and also in cooking methods based on organic solvents.
