WO2012147618A1 - 石炭ガス化プロセスにおける二酸化炭素膜分離システム、およびこれを用いた石炭ガス化複合発電設備 - Google Patents
石炭ガス化プロセスにおける二酸化炭素膜分離システム、およびこれを用いた石炭ガス化複合発電設備 Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/14—Dynamic membranes
- B01D69/141—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes
- B01D69/147—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes containing embedded adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/028—Molecular sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/028—Molecular sieves
- B01D71/0281—Zeolites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
- C01B3/12—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents by reaction of water vapour with carbon monoxide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/26—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension
- F02C3/28—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension using a separate gas producer for gasifying the fuel before combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
- C01B2203/042—Purification by adsorption on solids
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
- C01B2203/0465—Composition of the impurity
- C01B2203/0475—Composition of the impurity the impurity being carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/80—Aspect of integrated processes for the production of hydrogen or synthesis gas not covered by groups C01B2203/02 - C01B2203/1695
- C01B2203/84—Energy production
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
- C10J2300/1618—Modification of synthesis gas composition, e.g. to meet some criteria
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
- C10J2300/1643—Conversion of synthesis gas to energy
- C10J2300/1653—Conversion of synthesis gas to energy integrated in a gasification combined cycle [IGCC]
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/005—Carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
- C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
- C10K3/04—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment reducing the carbon monoxide content, e.g. water-gas shift [WGS]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/72—Application in combination with a steam turbine
- F05D2220/722—Application in combination with a steam turbine as part of an integrated gasification combined cycle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
Definitions
- the present invention relates to a carbon dioxide membrane separation system in a coal gasification process, and a coal gasification combined power generation facility using the same.
- coal has been used as a fuel for power generation, but its power generation method is more efficient than conventional pulverized coal-fired boiler power generation (IGCC) combined with a coal gasification combined power generation facility (IGCC) with excellent environmental conservation. ; Integrated Coal Gasification Combined Cycle).
- IGCC coal gasification combined power generation facility
- the coal serving as fuel is gasified to operate a gas turbine, and power is generated using the driving force of the gas turbine and the exhaust heat of the gas turbine.
- development of the gasification technique which converts coal into gas in various directions is performed actively (for example, refer to patent documents 1 and patent documents 2).
- the finely pulverized coal is first introduced into the pyrolysis reactor.
- coal is mixed with the high-temperature gas generated in the high-temperature gas generator and pyrolyzed to generate pyrolysis gas, oil, and char as pyrolysis reaction products.
- the generated char is separated from gas and oil by a cyclone. Part or all of the separated char is gasified (partially oxidized) with oxygen gas in a high temperature gas generation furnace (gasification furnace), and converted into high temperature gas (main components are hydrogen and carbon monoxide).
- the hot gas is then introduced into a water gas shift reactor, and carbon monoxide is converted into hydrogen and carbon dioxide by a water gas shift reaction represented by the following formula (1). Further, carbon dioxide is removed from the reaction gas, and a fuel gas rich in hydrogen is generated.
- CO + H 2 O CO 2 + H 2 (1)
- carbon dioxide (CO 2 ) is included in the fuel gas after the reaction in addition to hydrogen (H 2 ). Contains a mole fraction.
- the supply temperature is set to 20 ° C. or more and 200 ° C. or less from the viewpoint of separation performance. It becomes. In either case, when gasified, the temperature is about 200 to 400 ° C., and it is more advantageous in terms of thermal efficiency to supply it to the gas turbine as it is, but carbon dioxide (CO 2 ) is separated. In order to concentrate the fuel, there is a problem that it is necessary to cool it once.
- the object of the present invention is to solve the above-mentioned problems of the prior art, and in addition to the absence of an absorbent regeneration step necessary for the conventional carbon dioxide absorption method, the fuel gas gasified from coal remains carbon dioxide at a high temperature.
- the invention of the carbon dioxide membrane separation system in the coal gasification process according to claim 1 is characterized in that carbon dioxide (CO 2 ) in a high temperature and high pressure state generated by a water gas shift reaction from a water gas shift reactor.
- Introducing a mixed gas of hydrogen and hydrogen (H 2 ) into a zeolite membrane module having a zeolite membrane for carbon dioxide removal under the same temperature and pressure conditions to remove carbon dioxide and produce a fuel gas rich in hydrogen It is characterized by.
- the invention according to claim 2 is a combined coal gasification combined power generation facility using the carbon dioxide membrane separation system in the coal gasification process according to claim 1, wherein the hydrogen is discharged from the zeolite membrane module at a high temperature and high pressure. It is characterized by supplying rich fuel gas to the gas turbine of the power generation facility in the same temperature and pressure state.
- the invention of claim 4 is a combined coal gasification combined power generation facility using the membrane separation system of carbon dioxide in the fuel gas production process according to claim 3, wherein the zeolite of the fuel gas generation / carbon dioxide separation unit in the final stage
- the fuel gas rich in high-temperature and high-pressure state discharged from the membrane module is supplied to the gas turbine of the power generation facility in the same temperature and pressure state.
- the invention of the carbon dioxide membrane separation system in the coal gasification process according to claim 1 is a mixed gas of carbon dioxide (CO 2 ) and hydrogen (H 2 ) in a high temperature / high pressure state generated by a water gas shift reaction from a water gas shift reactor. Is introduced into a zeolite membrane module having a zeolite membrane for carbon dioxide removal under the same temperature and pressure conditions to remove carbon dioxide and produce a fuel gas rich in hydrogen.
- gas cooling (heat exchanger) for removing carbon dioxide (CO 2 ) is unnecessary in the conventional carbon dioxide absorption method, and an absorbent regeneration process necessary for the carbon dioxide absorption method is provided.
- carbon dioxide (CO 2) of the high temperature fuel gas is gasified from coal concentrated by separating, to the gas turbine An effect that it is possible to feed.
- the invention according to claim 2 is a combined coal gasification combined power generation facility using the carbon dioxide membrane separation system in the coal gasification process according to claim 1, wherein the hydrogen is discharged from the zeolite membrane module at a high temperature and high pressure.
- the rich fuel gas is supplied to the gas turbine of the power generation facility in the same temperature and pressure state. According to the invention of claim 2, energy can be used effectively, and coal fuel is supplied. There is an effect that the power generation cost used can be significantly reduced.
- the water gas shift reaction ⁇ The combination of zeolite membrane module having a zeolite membrane for carbon dioxide removal by connecting successively, thereby improving the reaction conversion of the water gas shift reaction. Furthermore, the fuel gas gasified from coal can be concentrated by separating it with carbon dioxide (CO 2 ) at a high temperature and supplied to the gas turbine.
- CO 2 carbon dioxide
- the invention of claim 4 is a combined coal gasification combined power generation facility using the membrane separation system of carbon dioxide in the fuel gas production process according to claim 3, wherein the zeolite of the fuel gas generation / carbon dioxide separation unit in the final stage According to the invention of claim 4, the fuel gas rich in high-temperature and high-pressure hydrogen discharged from the membrane module is supplied to the gas turbine of the power generation facility in the same temperature and pressure state. Energy can be used effectively, and the power generation cost using coal fuel can be greatly reduced.
- the finely pulverized coal is first introduced into a pyrolysis reactor (not shown).
- a pyrolysis reactor coal is mixed with the high-temperature gas generated in the high-temperature gas generator and pyrolyzed to generate pyrolysis gas, oil, and char as pyrolysis reaction products.
- the generated char is separated from gas and oil by a cyclone.
- part or all of the separated char is gasified (partially oxidized) with oxygen gas in a high temperature gas generation furnace (gasification furnace), and the high temperature gas (main components are hydrogen and carbon monoxide). ).
- the hot gas is then introduced into a water gas shift reactor, and carbon monoxide is converted into hydrogen and carbon dioxide by a water gas shift reaction represented by the following formula (1).
- CO + H 2 O CO 2 + H 2 (1)
- the fuel gas after the reaction contains an equimolar amount of carbon dioxide (CO 2 ) in addition to hydrogen (H 2 ).
- the carbon dioxide membrane separation system in the coal gasification process according to the present invention uses a mixed gas of carbon dioxide (CO 2 ) and hydrogen (H 2 ) in a high temperature and high pressure state generated by a water gas shift reaction from a water gas shift reactor as it is. It is introduced into a zeolite membrane module having a zeolite membrane for removing carbon dioxide at the temperature and pressure conditions to remove carbon dioxide and produce a fuel gas rich in hydrogen.
- CO 2 carbon dioxide
- H 2 hydrogen
- “in the same temperature and pressure state” means that no gas cooling facilities are used, and does not exclude a decrease in temperature and pressure due to natural heat dissipation or the like.
- gas cooling for removing carbon dioxide (CO 2 ) in the conventional carbon dioxide absorption method is unnecessary.
- the fuel gas gasified from coal is concentrated by separating carbon dioxide (CO 2 ) at a high temperature and supplied to the gas turbine. Is possible.
- the coal gasification combined power generation facility using the carbon dioxide membrane separation system in the coal gasification process of the present invention is a high temperature / high pressure hydrogen-rich fuel gas discharged from the zeolite membrane module. In this state, it is supplied to the gas turbine of the power generation facility.
- coal gasification combined power generation facility of the present invention energy can be used effectively, and the power generation cost using coal fuel can be significantly reduced.
- a carbon dioxide membrane separation system in the coal gasification process of the present invention comprises a fuel gas generation / carbon dioxide separation unit comprising a combination of the water gas shift reactor and a zeolite membrane module having a zeolite membrane for removing carbon dioxide.
- a fuel gas generation / carbon dioxide separation unit comprising a combination of the water gas shift reactor and a zeolite membrane module having a zeolite membrane for removing carbon dioxide.
- 2 to 5 in succession, and reacting the unreacted raw material gas contained in the hydrogen-rich fuel gas generated from each unit in the water gas shift reactor of the next unit.
- the carbon dioxide produced in each unit is recovered, and according to the present invention, gas cooling (heat exchanger) for removing carbon dioxide (CO 2 ) is unnecessary in the conventional carbon dioxide absorption method.
- the water gas shift reaction ⁇ The combination of zeolite membrane module having a zeolite membrane for carbon dioxide removal by connecting successively, thereby improving the reaction conversion of the water gas shift reaction. Furthermore, it becomes possible to concentrate the fuel gas gasified from coal by carbon dioxide (CO 2 ) separation at a high temperature and supply it to the gas turbine.
- CO 2 carbon dioxide
- coal gasification combined cycle power generation facility using the carbon dioxide membrane separation system in the fuel gas production process of the present invention is a high temperature / high pressure state discharged from the zeolite membrane module of the final stage fuel gas generation / carbon dioxide separation unit.
- the fuel gas rich in hydrogen is supplied to the gas turbine of the power generation facility in the same temperature and pressure state.
- coal gasification combined power generation facility of the present invention energy can be used effectively, and the power generation cost using coal fuel can be significantly reduced.
- a typical type of the zeolite membrane for removing carbon dioxide used in the zeolite membrane module of the carbon dioxide membrane separation system in the coal gasification process of the present invention is Y type (FAU type). It is particularly preferable to use a composite zeolite membrane having an oxygen 8-membered ring structure on the surface of a zeolite membrane having an oxygen 12-membered ring structure formed on a support such as porous alumina.
- the adsorption capacity of the zeolite species for carbon dioxide is larger than that of other gases such as hydrogen, so carbon dioxide is preferentially adsorbed on the zeolite membrane surface, and the pores of the membrane are reduced. Permeated through the diffusion and transfer of carbon dioxide to the membrane secondary side, while the pores of the membrane are filled with carbon dioxide molecules, making it difficult for other gas molecules to enter the pores. It is a mechanism that can be separated.
- porous support used for the composite zeolite membrane examples include, but are not limited to, porous materials such as alumina, silica, cordierite, zirconia, titania, Vycor glass, and sintered metal.
- a porous body can be used.
- the shape of the porous support is usually a tube shape or a plate shape.
- the pore size of the porous support is usually from 0.01 to 5 ⁇ m, preferably from 0.05 to 2 ⁇ m.
- Formation of a zeolite membrane having an oxygen 12-membered ring structure is performed, for example, by applying an aqueous suspension of a zeolite powder (seed crystal) on the surface of a porous support, drying at a predetermined temperature, and then hydrothermally synthesizing. Is done by.
- the type of zeolite used as a raw material is not particularly limited, and examples thereof include Y-type zeolite (FAU), beta-type zeolite (BEA), and mordenite (MOR).
- a coating method for forming the zeolite membrane is not particularly limited, but a rubbing (rubbing) method or a dipping method is preferable.
- the rubbing (rubbing) method is a method in which a zeolite powder suspension (seed crystal) is uniformly applied by rubbing a zeolite powder suspension on the surface of a porous support and then drying it if desired.
- the dipping method is a method in which a porous support is dipped in a zeolite powder suspension, and a zeolite powder (seed crystal) is uniformly coated on the surface.
- hydrothermal synthesis is performed.
- a zeolite membrane can be formed from the zeolite powder coated on the porous support.
- the temperature of the hydrothermal synthesis is not particularly limited, but is preferably 80 to 300 ° C. from the viewpoint of more uniformly forming a zeolite membrane on the porous support, and the reaction time is usually 2 to 720 hours, preferably 6 ⁇ 120 hours.
- the composite zeolite membrane of the present invention is provided with a zeolite membrane having an oxygen 8-membered ring structure on the surface of the zeolite membrane having an oxygen 12-membered ring structure formed on a support such as porous alumina as described above. It is what has been.
- the zeolite membrane module of the carbon dioxide membrane separation system of the present invention is preferably in a turbulent state as much as possible when supplying the mixed gas to be separated to the tubular membrane element. It is preferable to provide a double tube structure by providing an outer tube, and to have a structure in which a mixed gas flows through the gap between the membrane element and the outer tube at a flow rate of 10 m / s or more.
- the zeolite membrane having an oxygen 12-membered ring structure is constituted by a FAU type zeolite membrane, and the zeolite membrane having an oxygen 8-membered ring is CHA type. It is preferable to be composed of zeolite or MER type zeolite membrane, preferably CHA type zeolite.
- Y-type zeolite is a zeolite having the same crystal structure as faujasite, which is a natural zeolite, and is formed by a polyhedron including a 12-membered ring of oxygen. It is known to be 0.74 nm, and can pass through vacancies to molecules of about 0.95 nm by molecular vibration.
- the CHA-type zeolite has a pore formed by a polyhedron containing an oxygen 8-membered ring, and the pore diameter of the oxygen 8-membered ring is 0.38 nm.
- the CHA-type zeolite having such structural characteristics has a relatively small pore size among zeolites.
- the thickness of the zeolite membrane having an oxygen 12-membered ring structure before the conversion treatment is to maintain a high membrane permeability.
- the thickness is desirably 10 ⁇ m or less, and preferably 0.1 ⁇ m to 10 ⁇ m.
- the film thickness of the converted zeolite layer having an oxygen 8-membered ring structure is preferably 10 nm or more from the viewpoint of durability and 2 ⁇ m or less from the viewpoint of membrane permeability.
- the molecular size of carbon dioxide (CO 2 ) is 0.33 nm.
- the method for producing a composite zeolite membrane used for the zeolite membrane module has, for example, an oxygen 12-membered ring structure formed on a support in an alkaline aqueous solution to which zeolite powder having an oxygen 12-membered ring structure is added.
- a part of the surface of the zeolite membrane having an oxygen 12-membered ring structure formed on the support is immersed in the zeolite membrane and subjected to heat and pressure treatment under a predetermined condition, and has an oxygen 8-membered ring structure.
- a composite zeolite membrane is formed in which a zeolite membrane having an oxygen 8-membered ring structure is provided on the surface of the zeolite membrane having an oxygen 12-membered ring structure.
- zeolite powder having an oxygen 12-membered ring structure added in an amount of 0.01 to 20 wt%, preferably 1 to 10 wt%.
- a zeolite membrane having an oxygen 12-membered ring structure formed on a support is immersed in a 1 to 1 mol / L potassium hydroxide aqueous solution, and the temperature is 80 to 150 ° C., preferably 95 to 125 ° C., and the pressure is 0 It is preferable that the heating and pressurizing treatment be performed for 1 to 120 hours, preferably 6 to 36 hours under the condition of 0.05 to 2 MPa, preferably 0.1 to 1 MPa.
- the zeolite membrane having an oxygen 12-membered ring structure is constituted by a FAU-type zeolite membrane
- the zeolite membrane having an oxygen 8-membered ring is constituted by a CHA-type zeolite membrane. Particularly preferred.
- an oxygen 8-membered ring structure is obtained compared to the conventional synthesis method. It is possible to make the zeolite membrane layer having a large thickness thin, and it is possible to synthesize a composite zeolite membrane having a molecular sieve function.
- the film thickness of the FAU type zeolite membrane before the conversion treatment is desirably 0.1 ⁇ m to 10 ⁇ m.
- the film thickness of the converted CHA-type zeolite layer having an 8-membered ring structure is preferably 10 nm or more from the viewpoint of durability and 2 ⁇ m or less from the viewpoint of membrane permeability.
- the thickness of the zeolite layer is measured by observing a cross section with an electron microscope or by examining a XRD (X-ray diffraction) pattern after grinding and removing a layer having a predetermined thickness from the surface of the zeolite membrane. can do.
- XRD X-ray diffraction
- Example 1 First, finely pulverized coal is introduced into a pyrolysis reactor (not shown).
- a pyrolysis reactor coal is mixed with the high-temperature gas generated in the high-temperature gas generator and pyrolyzed to generate pyrolysis gas, oil, and char as pyrolysis reaction products.
- the generated char is separated from gas and oil by a cyclone.
- part or all of the separated char is gasified (partially oxidized) with oxygen gas in a high temperature gas generation furnace (gasification furnace), and the high temperature gas (main components are hydrogen and carbon monoxide). ).
- the hot gas is then introduced into the water gas shift reactor, where carbon monoxide (CO) is converted to hydrogen (H 2 ) and carbon dioxide (CO 2 ) by the water gas shift reaction.
- CO carbon monoxide
- the carbon dioxide membrane separation system in the coal gasification process according to the present invention uses a mixed gas of carbon dioxide (CO 2 ) and hydrogen (H 2 ) in a high temperature and high pressure state generated by a water gas shift reaction from a water gas shift reactor as it is. It is introduced into a zeolite membrane module having a zeolite membrane for removing carbon dioxide at the temperature and pressure conditions to remove carbon dioxide and produce a fuel gas rich in hydrogen.
- CO 2 carbon dioxide
- H 2 hydrogen
- the mixed gas containing hydrogen (H 2 ) and carbon dioxide (CO 2 ) after being discharged from the water gas shift reactor is in a state where the pressure is 2 to 4 MPa and the temperature is about 200 to 400 ° C. It is directly received by the zeolite membrane module to remove carbon dioxide (CO 2 ) and produce a fuel gas rich in hydrogen.
- a composite zeolite membrane used for the zeolite membrane module of the carbon dioxide membrane separation system of the present invention was produced as follows.
- an aqueous suspension of FAU-type zeolite powder (seed crystal) (manufactured by Tosoh Corp.) is applied to the surface of a porous alumina tube (substrate) (manufactured by Hitachi Zosen Corp.) by a conventional method, and then dried.
- a FAU type zeolite membrane was synthesized by hydrothermal synthesis for 75 hours.
- the film thickness of the FAU type zeolite membrane on the surface of the porous alumina tube before the conversion treatment was about 2 ⁇ m.
- a composite zeolite membrane was produced as follows by a conversion treatment of the zeolite membrane.
- a 12-membered oxygen film formed on a support made of the above porous alumina tube in a 0.5 mol / L potassium hydroxide aqueous solution to which FAU type zeolite powder was added at a rate of 10 wt%.
- a composite zeolite membrane in which a CHA-type zeolite membrane was provided on the surface of the FAU-type zeolite membrane was formed.
- the surface of the FAU type zeolite membrane having an oxygen 12-membered ring structure formed on a porous alumina tube (substrate) is CHA type having an oxygen 8-membered ring structure.
- the zeolite membrane module of the carbon dioxide membrane separation system of the present embodiment is desirably in a turbulent state as much as possible when supplying the mixed gas to be separated to the tubular membrane element.
- the outer tube is provided to form a double tube structure, and the mixed gas flows through the gap between the membrane element and the outer tube at a flow rate of 10 m / s or more.
- Example 2 In the carbon dioxide membrane separation system in the coal gasification process of this embodiment, fuel gas generation / carbon dioxide comprising a combination of the water gas shift reactor of the above embodiment 1 and a zeolite membrane module having a zeolite membrane for removing carbon dioxide. Three separation units are combined in order, and the unreacted raw material gas contained in the hydrogen-rich fuel gas generated from each unit is reacted in the water gas shift reactor of the next stage unit, and the carbon dioxide generated in each unit. Carbon was recovered.
- the zeolite membrane modules are arranged after the water gas shift reactor, and the water gas shift reactor + zeolite membrane module is similarly inserted in the subsequent stage, so that the unreacted gas reacts by the amount of carbon dioxide (CO 2 ).
- the equilibrium state is shifted easily. This has improved the reaction conversion rate to fuel gas and promoted the effective use of coal fuel.
- the combined coal gasification combined power generation facility using the carbon dioxide membrane separation system in the fuel gas production process of the present invention is a high-temperature / high-pressure state discharged from the zeolite membrane module of the final stage fuel gas generation / carbon dioxide separation unit.
- the hydrogen-rich fuel gas was supplied to the gas turbine of the power generation facility at the same temperature and pressure.
- coal gasification combined power generation facility of this example energy could be used effectively, and the power generation cost using coal fuel could be greatly reduced.
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Abstract
Description
ガスタービンへの燃料ガス(H2)を精製するためのガス化炉および水性ガスシフト反応炉においては、反応後の燃料ガスには、水素(H2)以外にも二酸化炭素(CO2)が等モル分含まれている。
反応後の燃料ガスには、水素(H2)以外にも二酸化炭素(CO2)が等モル分含まれている。
本発明の二酸化炭素膜分離システムのゼオライト膜モジュールに用いる複合ゼオライト膜は、酸素12員環構造を有するゼオライト膜が、FAU型ゼオライト膜により構成され、酸素8員環を有するゼオライト膜が、CHA型ゼオライトまたはMER型ゼオライト膜、好ましくはCHA型ゼオライトにより構成されることが好ましい。
まず、微粉砕した石炭は熱分解反応炉(図示略)に導入される。熱分解反応炉では、高温ガス発生炉において発生する高温ガスに石炭を混合し、熱分解することによって、熱分解反応生成物として熱分解ガス、オイル、チャーが発生する。発生したチャーは、サイクロンによってガス、オイルから分離される。
この実施例の石炭ガス化プロセスにおける二酸化炭素膜分離システムでは、上記実施例1の水性ガスシフト反応炉と、二酸化炭素除去用ゼオライト膜を具備するゼオライト膜モジュールとの組み合わせよりなる燃料ガス生成・二酸化炭素分離ユニットを、順に3個連続して組み合わせ、各ユニットから生じる水素に富む燃料ガス中に含まれる未反応原料ガスを、次段のユニットの水性ガスシフト反応炉において反応させるとともに、各ユニットで生じる二酸化炭素を回収した。
Claims (4)
- 水性ガスシフト反応炉からの水性ガスシフト反応により発生する高温・高圧状態の二酸化炭素(CO2)と水素(H2)の混合ガスを、そのままの温度・圧力状態で二酸化炭素除去用ゼオライト膜を具備するゼオライト膜モジュールに導入し、二酸化炭素を除去するとともに、水素に富む燃料ガスを生成することを特徴とする、石炭ガス化プロセスにおける二酸化炭素膜分離システム。
- ゼオライト膜モジュールから排出される高温・高圧状態の水素に富む燃料ガスを、そのままの温度・圧力状態で発電設備のガスタービンへ供給することを特徴とする、請求項1に記載の石炭ガス化プロセスにおける二酸化炭素膜分離システムを用いた石炭ガス化複合発電設備。
- 請求項1に記載の水性ガスシフト反応炉と、二酸化炭素除去用ゼオライト膜を具備するゼオライト膜モジュールとの組み合わせよりなる燃料ガス生成・二酸化炭素分離ユニットを、順に複数個連続して組み合わせ、各ユニットから生じる水素に富む燃料ガス中に含まれる未反応原料ガスを、次段のユニットの水性ガスシフト反応炉において反応させるとともに、各ユニットで生じる二酸化炭素を回収することを特徴とする、燃料ガス製造プロセスにおける二酸化炭素の膜分離システム。
- 最終段の燃料ガス生成・二酸化炭素分離ユニットのゼオライト膜モジュールから排出される高温・高圧状態の水素に富む燃料ガスを、そのままの温度・圧力状態で発電設備のガスタービンへ供給することを特徴とする、請求項3に記載の石炭ガス化プロセスにおける二酸化炭素膜分離システムを用いた石炭ガス化複合発電設備。
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US14/112,650 US9863314B2 (en) | 2011-04-28 | 2012-04-19 | Carbon dioxide membrane separation system in coal gasification process, and integrated coal gasification combined cycle power generation facility using same |
CN201280020340.XA CN103687932B (zh) | 2011-04-28 | 2012-04-19 | 煤气化工艺中的二氧化碳膜分离系统及使用该系统的煤气化复合发电设备 |
JP2013512308A JP5775930B2 (ja) | 2011-04-28 | 2012-04-19 | 石炭ガス化プロセスにおける二酸化炭素膜分離システム、およびこれを用いた石炭ガス化複合発電設備 |
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JP2012236137A (ja) * | 2011-05-11 | 2012-12-06 | Hitachi Zosen Corp | 石炭ガス化プロセスにおける二酸化炭素膜分離システム、およびこれを用いた石炭ガス化複合発電設備 |
EP3132842A1 (en) * | 2014-04-18 | 2017-02-22 | Mitsubishi Chemical Corporation | (porous support)-(zeolite film) complex, and method for producing (porous support)-(zeolite film) complex |
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WO2021024045A1 (en) * | 2019-08-07 | 2021-02-11 | Chevron Usa Inc. | Potassium-merlinoite zeolite, its synthesis and use |
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