The present invention relates to the field of flue gas nitrogen oxide emission, and in particular to a method and a combustion system for reducing nitrogen oxide emission. Introducing non-nitrogen inert gas as a combustion diluent to establish ignition; when the amount of circulation flue gas reaches a designed value, the introduction of the non-nitrogen inert gaseous diluent is stopped; and by means of circulation of a part of flue gas and a part of CO2 in the flue gas, the internal circulation of the whole process system is ensured. The present invention achieves the objectives of reducing the nitrogen oxide emission and saving the fuel, thereby saving the energy, protecting the environment, fundamentally solving the emission problem of NOx in the flue gas, and achieving carbon reduction.
A process for producing olefins by steam cracking of a heavier hydrocarbon includes the steps of: subjecting a heavier hydrocarbon to a first separation to obtain a first vapour stream and a first liquid stream, partially condensing (second separation) the first vapour stream to obtain a condensate (third heavier fraction), introducing at least a portion of the third heavier fraction into the first liquid stream to obtain a first modified liquid stream, subjecting the first modified liquid stream to a third separation to obtain a second vapour stream and a second liquid stream, and carrying out steam cracking on the second vapour stream to obtain a cracked gas effluent containing the olefins. This process inhibits the coking of the convection zone, and provide a high utilization rate of heavier hydrocarbon (crude oil) and a high ethylene yield.
The present invention relates to a gas-liquid separation device and the use thereof in the preparation of olefin by steam cracking. A method for preparing olefin by steam cracking of the present invention comprises the following steps: heating heavy hydrocarbon to obtain a gas-liquid mixture; conveying the gas-liquid mixture into a gas-liquid separation device for gas-liquid separation so as to obtain gas-phase materials and liquid-phase materials, wherein the gas-liquid separation device comprises an inner cavity, a liquid-phase outlet, a gas-phase outlet, one or more baffles, which divide at least the middle of the inner cavity into n separation chambers in the direction of the central axis of the inner cavity, a gas-liquid separation feeding device, and gas-liquid separation components, which are respectively arranged inside the n separation chambers and are configured to be capable of respectively performing gas-liquid separation in the n separation chambers, so as to obtain the corresponding n gas-phase materials and n liquid-phase materials; and performing steam cracking on at least one of the n gas-phase materials or the combined gas-phase materials to obtain a cracking product containing olefin. The gas-liquid separation device of the present invention has the characteristics of long-period operation, etc.
C10G 55/04 - Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one refining process and at least one cracking process plural serial stages only including at least one thermal cracking step
B01D 45/12 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
The present invention relates to a coke burning method of a steam cracking furnace. The coke burning method of a steam cracking furnace of the present invention comprises the following steps: 1) subjecting heavy hydrocarbons to gas-liquid separation in a gas-liquid separation device to obtain a gas-phase material and a liquid-phase material, and depositing residues on the inner wall of the gas-liquid separation device; 2) conveying the gas-phase material into a radiant section furnace tube of a steam cracking furnace to perform pyrolysis so as to generate a pyrolysis product containing ethylene and deposit coke on the inner wall of the radiant section furnace tube; 3) conveying air and/or steam through the radiant section furnace tube to remove at least part of the coke, so as to obtain coke-burning tail gas; and 4) making the coke-burning tail gas enter a hearth via at least one burner disposed in the hearth of the steam cracking furnace and undergo a combustion treatment. The present invention can effectively solve the decoking problem of a gas-liquid separation device of a heavy-hydrocarbon cracking furnace.
F23G 7/06 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
22 in the flue gas, the internal circulation of the whole process system is ensured. The objectives of reducing the nitrogen oxide emission and saving the fuel are achieved, thereby saving the energy, protecting the environment, fundamentally solving the emission problem of NOx in the flue gas, and achieving carbon reduction.
Provided is a method for treating an oil gas, which can realize high-efficiency separation for and recovery of gasoline components, C2, C3, and C4 components. The method first conducts separation of light hydrocarbon components from gasoline components, and then performs subsequent treatment on a stream rich in the light hydrocarbon components, during which it is no longer necessary to use gasoline to circularly absorb liquefied gas components, which significantly reduces the amount of gasoline to be circulated and reduces energy consumption throughout the separation process. Besides, in this method, impurities, such as H2S and mercaptans, in the stream rich in the light hydrocarbon components are removed first before the separation for the components. This ensures that impurities will not be carried to a downstream light hydrocarbon recovery section, thus avoiding corrosion issues caused by hydrogen sulfide in the light hydrocarbon recovery section.
C10G 53/08 - Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one sorption step
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
7.
Processing apparatus, corrugated plate, and storage container
Disclosed are a processing apparatus, a corrugated plate, and a storage container. The processing apparatus includes a pair of slide plates, a pair of press plates, a shaping block, and a driving mechanism. The driving mechanism includes a slide plate driving portion linked to a shaping block driving portion, allowing the slide plate driving portion drives the pair of slide plates to approach each other at a first predetermined speed, the shaping block driving portion moves the shaping block downward at a second predetermined speed, and the first and second predetermined speed are specifically correlated with respect to a predetermined forming profile of an intersection portion. The processing apparatus of the present disclosure causes running speeds of various portions that move in different directions to extrude a blank plate to be specifically associated, so that the formation process is particularly applicable to a corrugated plate having the predetermined corrugated shape.
A heat recovery apparatus and process for cracked gas are provided. The cracked gas comprises liquid feedstock cracked gas and gaseous feedstock cracked gas, and the apparatus comprises a heat recovery device for liquid feedstock cracked gas, a heat recovery device for gaseous feedstock cracked gas and a heavy component removal unit. The invention solves the problems in the art, i.e., incomplete heat recovery technology for cracked gas, insufficient control of viscosity of quench oil, high capital investment and large footprint of the equipment, as well as unstable operation and high energy consumption.
The present invention relates to a method and system for producing an olefin by steam cracking a heavy hydrocarbon. The method for producing an olefin by steam cracking a heavy hydrocarbon comprises the following steps: carrying out first separation of the heavy hydrocarbon, and obtaining a first gas-phase material and a first liquid-phase material; partially condensing the first gas-phase material (second separation), and obtaining a condensate (third heavy component); introducing at least a portion of the third heavy component into the first liquid-phase material, and obtaining a first modified liquid-phase material; carrying out a third separation for the first modified liquid-phase material, and obtaining a second gas-phase material and a second liquid-phase material; and steam cracking the second gas-phase material, and obtain a cracked product containing the olefin. Compared with existing technology, the method and system of the present invention may inhibit coking of a convection section and have high utilization of the heavy hydrocarbon (crude oil) and a high ethylene yield.
C10G 55/04 - Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one refining process and at least one cracking process plural serial stages only including at least one thermal cracking step
The present invention relates to a fractionating column and an application thereof. The fractionating column comprises a housing and a partition provided in the housing; the partition partitions the interior of the housing into a lower section A (flash evaporation section) and an upper section B (fractionation section). The fractionating column of the present invention has a compact structure, cracking gas is separately fed to a liquid furnace and a gas furnace, and a flash evaporation method is used to lower the viscosity, thereby reducing device investment and space occupied and improving heat utilization, providing great significance for long-term stable operation of ethylene plants as well as energy conservation and consumption reduction.
The present invention relates to a cracked gas heat recovery apparatus and method. Cracked gas comprises liquid raw material cracked gas and gas raw material cracked gas. The apparatus comprises a liquid raw material cracked gas heat recovery device, a gas raw material cracked gas heat recovery device, and a heavy component removal unit. The present invention solves the problems in the art of incomplete cracked gas heat recovery technology, insufficient control of quenching oil viscosity, high device investment, large occupied area, unstable operation of apparatuses, high energy consumption and the like.
F22B 1/18 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
F27D 17/00 - Arrangements for using waste heatArrangements for using, or disposing of, waste gases
B01D 5/00 - Condensation of vapoursRecovering volatile solvents by condensation
2S and mercaptans, in the stream rich in the light hydrocarbon components are removed first before the separation for the components. This ensures that impurities will not be carried to a downstream light hydrocarbon recovery section, thus avoiding corrosion issues caused by hydrogen sulfide in the light hydrocarbon recovery section.
C10G 53/08 - Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one sorption step
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
C10G 53/02 - Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
Disclosed is an oil and gas processing method, which can achieve high-efficient separation and recovery of gasoline components and C2, C3 and C4 components. Light hydrocarbon components is first separated from gasoline components, and then the stream rich in the light hydrocarbon components is subject to post-processing, and therefore, it is no longer necessary to absorb liquefied gas components by gasoline circulation, so that the gasoline circulation volume is greatly reduced, and the energy consumption of the entire separation process is reduced. Before the component separation process is performed, impurities, such as HZS and mercaptans, in the stream rich in the light hydrocarbon components are removed to ensure that the impurities will not be brought to the downstream light hydrocarbon recovery part, which avoids the corrosion problem related to the recovery of light hydrocarbons caused by hydrogen sulfide, and at the same time, the downstream hydrogen sulfide concentration is greatly reduced, and both safety and the quality of downstream products are improved.
C10G 53/02 - Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
C07C 7/00 - Purification, separation or stabilisation of hydrocarbonsUse of additives
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
The present invention discloses a control method for a multi-phase winding deflection scanning device, comprising: defining a rectangular coordinate system where deflection scanning tracks are located; sequentially decomposing the deflection scanning tracks into finite point rectangular coordinate data; translating the rectangular coordinate data into corresponding point resultant exciting current data; decomposing the resultant exciting current data into n-phase winding exciting current data; and translating the n-phase winding exciting current data into corresponding n-phase control instruction electrical signals and outputting same to a drive power supply, amplifying the output electrical signals by the drive power supply and providing same for the multi-phase winding deflection scanning device as exciting current.
The present invention relates to a deflection scanning device with a multi-phase winding and a deflection scanning system. The deflection scanning device is of an axisymmetric structure, and comprises a ferromagnetic frame and a deflection scanning winding, wherein the inner side of the ferromagnetic frame is longitudinally provided with 2aw wire slots equally distributed along the circumference; and the deflection scanning winding comprises a w-phase winding, wherein the axis of the each phase winding is symmetrically distributed. The deflection scanning system comprises a deflection scanning device, a drive power supply unit and, a central, control unit. The deflection scanning device of the present invention can improve the uniformity of the magnetic induction intensity in the charged particle beam channel, and then reduce the defocusing effect and improve the scanning accuracy.
H01J 37/00 - Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
H01J 37/147 - Arrangements for directing or deflecting the discharge along a desired path
A nanocrystalline material based on a stainless steel surface. In percentage by weight, the nanocrystalline material comprises: 0 to 3% of carbon, 20% to 35% of oxygen, 40% to 53% of chromium, 10% to 35% of ferrum, 0 to 4% of molybdenum, 1% to 4% of nickel, 0 to 2.5% of silicon, 0 to 2% of calcium, and the balance of impurity elements. Also disclosed is a preparation method for the nanocrystalline material, and the nanocrystalline material that is based on a stainless steel surface and that is prepared by using the preparation method.
C25D 5/36 - Pretreatment of metallic surfaces to be electroplated of iron or steel
C25D 5/50 - After-treatment of electroplated surfaces by heat-treatment
C25D 11/00 - Electrolytic coating by surface reaction, i.e. forming conversion layers
C23C 22/24 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing hexavalent chromium compounds
C23C 22/78 - Pretreatment of the material to be coated
The present disclosure provides an ethylene cracking furnace, comprising at least one radiant section provided with a bottom burner and/or a side burner, and at least one set of radiant coil arranged along a longitudinal direction of the radiant section. The radiant coil is an at least two-pass coil having an N−1 structure, wherein N is preferably a natural number from 2 to 8. A manifold is arranged at an inlet end of a downstream tube of said at least two-pass coil, and an outlet end of each upstream tube of said at least two-pass coil is connected to the manifold through a curved connector. The arrangement according to the present disclosure can effectively reduce the expansion differences between the upstream tubes and the downstream tubes, and therefore reduce the stress caused thereby. Consequently, bending of the radiant coil can be avoided, thereby extending the service life of the radiant coil.
F28D 7/06 - 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 having a single U-bend
C07C 4/02 - Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
F28D 21/00 - Heat-exchange apparatus not covered by any of the groups
18.
Fluidized bed polymerization reactor and process for preparing polymer
The invention provides a fluidized bed polymerization reactor, including: a column, in which a liquid distributor and a gas distributor above the liquid distributor are arranged, so that the reaction zone being divided into a first zone and a second zone through the gas distributor; and a circulating unit for circulating the gas material originated from the top zone of the column into the bottom zone thereof in a form of gas-liquid mixture. The gas-liquid mixture is undergone a gas-liquid separation in the bottom zone, the gas phase portion obtained being fed to the gas distributor and then into the second zone while the liquid phase portion obtained being entered into the first zone through the liquid distributor, so that the temperature in the first zone is lower than that in the second zone. Therefore, polymer with a molecular weight distributed in a relatively wide range can be obtained. The invention further provides a method for preparing polymer.
B01J 8/24 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique
B01J 8/32 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique with introduction into the fluidised bed of more than one kind of moving particles
B01J 8/18 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles
B01J 8/22 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles with liquid as a fluidising medium gas being introduced into the liquid
C08F 2/01 - Processes of polymerisation characterised by special features of the polymerisation apparatus used
C08F 10/00 - Homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
The present disclosure provides an ethylene cracking furnace, comprising at least one radiant section provided with a bottom burner and/or a side burner, and at least one set of radiant coil arranged along a longitudinal direction of the radiant section. The radiant coil is an at least two-pass coil having an N−1 structure, wherein N is preferably a natural number from 2 to 8. A manifold is arranged at an inlet end of a downstream tube of said at least two-pass coil, and an outlet end of each upstream tube of said at least two-pass coil is connected to the manifold through a curved connector. The arrangement according to the present disclosure can effectively reduce the expansion differences between the upstream tubes and the downstream tubes, and therefore reduce the stress caused thereby. Consequently, bending of the radiant coil can be avoided, thereby extending the service life of the radiant coil.
F28D 7/06 - 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 having a single U-bend
F28D 21/00 - Heat-exchange apparatus not covered by any of the groups
An ethylene cracking furnace is provided. The ethylene cracking furnace includes at least one radiant section. The at least one radiant section includes bottom burners and/or sidewall burners, and at least one radiant coil arranged in the radiant section. The radiant coil includes at least an upstream pass tube and a downstream pass tube, the upstream pass tube being configured as an inner tube, and the downstream pass tube being configured as an outer tube surrounding the inner tube and having a closed end. The inner tube defines an inner space forming an upstream flow path. A gap defined between the inner tube and the outer tube forms an downstream flow path.
An ethylene cracking furnace is provided, comprising: at least one radiation region where a bottom burner and/or side wall burner is installed; and at least one set of radiation furnace tubes arranged along the longitudinal direction of the radiation region. The radiation furnace comprises at least two segments of furnace tube having a structure of N-1 type, wherein N is preferably a natural number between 2 and 8. A collective tube is provided at the lower end of the furnace tube in the downstream segment of the at least two segments of furnace tube. The lower end of the furnace tube in the upstream segment of the at least two segments of furnace tube is connected to the collective tube via a curved connector. By means of this configuration, stress existing in the furnace tubes, due to the inequality in expansion between the furnace tubes in the first segment and the difference in expansion between the upstream and downstream segments of the furnace tubes, is reduced, thereby preventing the furnace tubes from bending and prolonging the service life of the radiation furnace tubes.
China Petroleum & Chemical Corporation, Beijing Institute of Chemical Industry (China)
Inventor
He, Xiou
Li, Changli
Zhang, Zhaobin
Liu, Jingkun
Yuan, Mujun
Zhou, Cong
Guo, Yuping
Zhao, Yonghua
Shen, Hainü
Abstract
The invention relates to an ethylene cracking furnace having a multi-pass radiant coil, comprising at least one radiant section. In the radiant section there are provided with bottom burners and/or sidewall burners, and at least one set of multi-pass radiant coil longitudinally arranged in the radiant section. The multi-pass radiant coil is a four- to ten-pass type radiant coil. At least one tube of the multi-pass radiant coil is arranged to be spatially adjacent to a tube which is not consecutive to said at least one tube. With this arrangement, the thermal radiation influence between tubes with high temperature can be reduced, so that the tubes with low temperature can absorb the radiation heat from the tubes with high temperature. Therefore, the surface temperature of the tubes with high temperature can be reduced, thus extending the lifetime of the radiant coil and the operational cycle of the cracking furnace.
F28D 7/00 - 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
C10G 9/14 - Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
The present invention provides a fluidized bed polymerization reactor, comprising: a tower body, provided therein with a liquid phase distributor and a gas phase distributor above the liquid phase distributor, so as to divide a reaction area into a first area and a second area by means of the gas phase distributor; and a recycling unit, for recycling the gaseous substances originating from the top area of the tower to the bottom area in the form of a gas liquid mixture. In this situation, the gas liquid mixture is subjected to a gas liquid separation in the bottom area, wherein the gas phase obtained is output into the gas phase distributor and thence into the second area, and the liquid phase obtained enters the first area via the liquid phase distributor, such that the temperature in the first area is lower than the temperature in the second area. A polymer with a relatively wide molecular weight distribution can thus be produced. The present invention also provides a process for preparing polymers.
B01J 8/24 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique
Nanjing Industrial Furnace Institute of Tianhua of Chemical Machinery & Automation (China)
Sinopac Engineering Incorporation (China)
Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corp. (China)
Inventor
He, Xiou
Wang, Guoqing
Li, Changli
Zhang, Lijun
Li, Jinke
Shao, Chen
Li, Guang
Guo, Yuping
Abstract
An ethylene cracking furnace comprising a high pressure steam drum (1), a convection section (2), a radiant section (3), multiple groups of radiant coils (4) arranged vertically in the firebox of radiant section, burners (5) and transfer line exchangers (6), each radiant coil comprising a first-pass tube (7), a second-pass tube (8) and a connection member (9); feedstocks being introduced into an inlet end of the first-pass tube and outflow from an outlet end of the second-pass tube, said first-pass tube (7) and said second-pass tube (8) are non-split coils, and the centerlines of the respective radiant tubes (7, 8) are within a common plane; said connection member (9) is a tridimensional structural member comprising an inlet bending tube (10), a return bending tube (11) and an outlet bending tube (12); said inlet bending tubes (10) and said outlet bending tubes (12) are arranged at two sides of the plane containing the centerlines of said first-pass tubes (7) and said second-pass tubes (8), respectively; the projections of the respective connection members (9) in a side view are the same curve line that is symmetrical, continuous and closed; the inner diameters of said radiant coils (7, 8) is varied at least once along the length of the tubes.
C10G 9/14 - Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
B01J 8/00 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes
C07C 4/02 - Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
25.
ETHYLENE CRACKING FURNACE WITH MULTIPASS RADIANT FURNACE TUBES
CHINA PETROLEUM & CHEMICAL CORPORATION BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY (China)
Inventor
He, Xiou
Li, Changli
Zhang, Zhaobin
Liu, Jingkun
Yuan, Mujun
Zhou, Cong
Guo, Yuping
Zhao, Yonghua
Shen, Hainü
Abstract
An ethylene cracking furnace with multipass radiant furnace tubes comprises at least a radiant section, a bottom burner and/or a side wall burner being arranged in the radiant section, and at least one set of multipass radiant furnace tubes being arranged longitudinally in the radiant section. The multipass radiant furnace tubes are four to ten rows of radiant tubes and at least one row of furnace tube thereof, does not neighbor another connecting one in space. By means of this arrangement, the influence of thermal radiant among high temperature tube rows can be reduced and the tubes with low wall temperature can absorb radiant heat from the tubes with high wall temperature, which is advantageous to reduce the surface temperature of furnace tube with a high temperature and to achieve the object of prolonging operating period of cracking furnace and service lifetime of radiant tubes.
C07C 4/02 - Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
A composite catalyst useful in the production of polyethylene, which comprises at least a first catalyst and a second catalyst separated by a polymer layer, with the first catalyst and the second catalyst being identical or different, is described. A composite catalyst useful in the production of polyethylene with a broad molecular weight distribution in a single polymerization reactor, which comprises at least a first catalyst and a second catalyst separated by a polymer layer, with the first catalyst and the second catalyst being different, is also described. A process for preparing said catalysts and a process for the production of a polyethylene by using said catalysts are also described.
C08F 4/06 - Metallic compounds other than hydrides and other than metallo-organic compoundsBoron halide or aluminium halide complexes with organic compounds containing oxygen
BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION (China)
NANJING INDUSTRIAL FURNACE INSTITUTE OF TIANHUA INSTITUTE OF CHEMICAL MACHINERY & AUTOMATION (China)
Inventor
He, Xiou
Wang, Guoqing
Li, Changli
Zhang, Lijun
Li, Jinke
Shao, Chen
Li, Guang
Guo, Yuping
Abstract
Disclosed is a ethylene cracking furnace which comprises followings: high pressure vapor-bag (1), convection section (2), radiation section, several furnace tubes (14) which are vertically set out in the radiation section, burner (5), and instant-freezing boiler (6); each furnace tube of radiation section comprises one first stroke pipe (7), one second stroke pipe (8) and one connecting piece (9); the cracking material is fed in through the inlet of the first stroke pipe, and drawn out through the outlet of the second stroke pipe; said first stroke pipe (7) and second stroke pipe (8) are non-branched furnace tubes, and the central lines of each furnace tube are in same plane; said connecting piece (9) is a stereo structure which comprises inlet bend (10), return bend (11) and outlet bend (12); said inlet bend (10) and outlet bend (12) are situated on the both sides of the plane in which are the central lines of the first stroke pipe (7) and the second stroke pipe (8); the side project of said connecting pieces (9) is one symmetrical continual endless curve, the inner diameters of furnace tubes are changed at least once along the length direction of said furnace tube.
C07C 4/02 - Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
A composite catalyst for production of polyethylene is provided, which comprises at least a first catalyst and a second catalyst isolated by a polymer, the first catalyst and the second catalyst may be the same or may be different. A composite catalyst for production of polyethylene with wide molecular weight distribution in a single polymerization reactor is also provided, which comprises at least a first catalyst and a second catalyst isolated by a polymer, the first catalyst and the second catalyst may be the same or may be different. The production method of the composite catalyst and the preparation method of polyethylene using the composite catalyst are also provided.
The present invention concerns a process for recovering lower carbon olefins from MTO or DTO product gas. Said process primarily comprises the product gas compressing, pre-deethanizing, demethanizing and ethylene recovering apparatus, depropanizing column, ethylene rectification column, propylene rectification column and the like. In addition, the process of the present invention needs no independent ethylene cooling system, and the ethylene recovery rate may achieve 99.5%.
patents
