WO2023062988A1 - ボイラ及びｃｏ２回収方法 - Google Patents

ボイラ及びｃｏ２回収方法 Download PDF

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Publication number
WO2023062988A1
WO2023062988A1 PCT/JP2022/033846 JP2022033846W WO2023062988A1 WO 2023062988 A1 WO2023062988 A1 WO 2023062988A1 JP 2022033846 W JP2022033846 W JP 2022033846W WO 2023062988 A1 WO2023062988 A1 WO 2023062988A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
gasification furnace
housing
boiler
fluid medium
Prior art date
Application number
PCT/JP2022/033846
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English (en)
French (fr)
Japanese (ja)
Inventor
学 誉田
Original Assignee
住友重機械工業株式会社
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Priority to JP2023555018A priority Critical patent/JPWO2023062988A1/ja
Priority to KR1020247010825A priority patent/KR20240087779A/ko
Publication of WO2023062988A1 publication Critical patent/WO2023062988A1/ja

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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • B01D53/14—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 absorption
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/83—Solid phase processes with moving reactants
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/60—Preparation of carbonates or bicarbonates in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/602—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F5/00—Compounds of magnesium
    • C01F5/24—Magnesium carbonates
    • 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

Definitions

  • the present invention relates to boilers and CO2 recovery methods.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to efficiently recover CO 2 contained in exhaust gas generated in a boiler.
  • a first boiler according to the present invention includes a gasification furnace and a CO 2 recovery section for recovering CO 2 from exhaust gas generated in the gasification furnace, wherein CO 2
  • the recovery unit has a housing provided with an intake for taking in the exhaust gas, and a fluid medium that flows inside the housing, the fluid medium containing steel slag containing an alkaline substance, and the intake CO2 contained in the exhaust gas introduced into the housing through the gas is reacted with the alkaline substance contained in the fluid medium to generate carbonate and recover the CO2 .
  • Calcium oxide and magnesium oxide can be used as the alkaline substance.
  • a first method for recovering CO 2 according to the present invention is a method for recovering CO 2 from exhaust gas generated in a gasification furnace, wherein an alkaline substance is contained inside a housing connected to the gasification furnace.
  • the exhaust gas generated in the gasification furnace is taken into the interior of the housing, and the CO 2 contained in the exhaust gas taken into the housing and the fluid medium (steel slag) flowing in the housing.
  • CO 2 can be recovered by reacting with an alkaline substance to form a carbonate. Therefore, it is possible to efficiently recover CO 2 at low cost while effectively using steel slag, which has been recognized as a residue, as a fluid medium.
  • the first boiler according to the present invention further comprising a solid-gas separator connected to the gasification furnace, and a heat recovery unit connected to the solid - gas separator, wherein
  • the exhaust gas generated in the gasification furnace can be configured to flow in through the solid-gas separator and the heat recovery section in sequence.
  • an exhaust port for discharging the exhaust gas is provided in the housing of the CO 2 recovery unit, and the exhaust gas discharged from the exhaust port is returned to the heat recovery unit through the return flow path.
  • the exhaust gas discharged from the exhaust port of the housing of the CO 2 recovery unit can be returned to the heat recovery unit via the return flow path and reused. In this way, by returning the exhaust gas to the heat recovery unit for reuse, it is possible to efficiently recover the heat contained in the exhaust gas.
  • a second boiler according to the present invention comprises a gasification furnace and a fluid medium that flows inside the gasification furnace, the fluid medium containing an alkaline substance. It contains iron and steel slag and is configured to recover CO2 by reacting CO2 contained in the exhaust gas generated in the gasification furnace with alkaline substances contained in the fluidized medium to produce carbonate.
  • a second boiler comprises a gasification furnace and a fluid medium that flows inside the gasification furnace, the fluid medium containing an alkaline substance. It contains iron and steel slag and is configured to recover CO2 by reacting CO2 contained in the exhaust gas generated in the gasification furnace with alkaline substances contained in the fluidized medium to produce carbonate.
  • Calcium oxide and magnesium oxide can be used as the alkaline substance.
  • a second CO 2 recovery method is a method for recovering CO 2 from exhaust gas generated in a gasification furnace, wherein a flow containing iron and steel slag containing an alkaline substance is placed inside the gasification furnace. It includes a medium charging step of charging a medium, and a CO2 recovery step of recovering CO2 by producing carbonate by reacting CO2 contained in the exhaust gas with an alkaline substance contained in the fluid medium .
  • carbonates are produced by reacting CO 2 contained in the exhaust gas generated in the gasification furnace with alkaline substances contained in the fluid medium (steel slag) flowing inside the gasification furnace. can be generated to capture CO2 . Therefore, it is possible to efficiently recover CO 2 at low cost while effectively using steel slag, which has been recognized as a residue, as a fluid medium.
  • FIG. 1 is a flow chart for explaining a CO 2 recovery method according to a first embodiment of the present invention
  • FIG. 4 is a configuration diagram showing the configuration of a boiler according to a second embodiment of the present invention
  • 4 is a flow chart for explaining a CO 2 recovery method according to a second embodiment of the present invention
  • a fluidized bed (CFB (Circulating Fluidized Bed) boiler (hereinafter referred to as "CFB boiler") 1 according to a first embodiment of the present invention will be described with reference to FIG.
  • the CFB boiler 1 includes a combustion furnace 2, a first cyclone separator 4, a heat recovery section 6, a first return line 8, a CO2 recovery section 100, a second cyclone separator 10, a second return line 12, It includes a return channel 14, a central processing unit 200, and the like.
  • the combustion furnace 2 is an external circulation fluidized bed combustion furnace that burns or gasifies fuel and heats water in a closed container (steam drum, not shown) to generate steam. It functions as a gasification furnace in the present invention.
  • Various fuels for example, biomass fuels such as rice husks and EFB (Empty Fruit Bunches), wood chips, tires, RPF, etc.
  • biomass fuels such as rice husks and EFB (Empty Fruit Bunches), wood chips, tires, RPF, etc.
  • a fluidized medium containing quartz particles as a main component is fed through a fuel inlet. hereinafter referred to as "bed") F is formed.
  • the formation of the bed F promotes fuel combustion.
  • the fluidized medium includes bottom ash BA, which is formed by condensing, melting, and aggregating components in biomass fuel with sand as a seed, or by chemically reacting on the sand surface to form particles. .
  • exhaust gas G Combustion gas (hereinafter referred to as "exhaust gas") G generated in the combustion furnace 2 rises inside the combustion furnace 2 while accompanying part of the fluid medium.
  • a gas outlet 2A for discharging exhaust gas is provided in the upper portion of the combustion furnace 2 .
  • a discharge port (not shown) for discharging the bottom ash BA is provided in the lower part of the combustion furnace 2 .
  • the fuel inlet of the combustion furnace 2 is provided with a fuel supply adjustment mechanism capable of changing each of the amount, composition, type of fuel, co-firing ratio, additive supply amount, and fluid medium supply amount.
  • a fluidized medium discharge adjustment mechanism capable of changing the amount of the fluidized medium discharged is provided.
  • the central processing unit 200 controls the fuel supply adjustment mechanism and fluidized medium discharge adjustment mechanism to adjust the amount of fuel introduced into the combustion furnace 2 and the amount of fluidized medium extracted from the combustion furnace 2. becomes.
  • the first cyclone separator 4 separates solids from the exhaust gas G and functions as a solid-gas separator in the present invention.
  • a first cyclone separator 4 is arranged adjacent to the combustion furnace 2 and is connected to the combustion furnace 2 via a gas outlet 2A.
  • the first cyclone separator 4 receives the exhaust gas G discharged from the combustion furnace 2 and the fluidized medium accompanying the exhaust gas G, separates the exhaust gas G from the fluidized medium by centrifugal separation, and transfers the fluidized medium to the combustion furnace 2. , and the exhaust gas G is sent to the heat recovery unit 6.
  • a first return line 8 is connected to the first cyclone separator 4 .
  • the heat recovery unit 6 functions to recover the heat of the exhaust gas G, and various heat exchange tubes (for example, a superheater for generating superheated steam, an economizer for preheating boiler feed water, etc.) are arranged. It is The superheater uses the heat of the exhaust gas to superheat the steam to produce superheated steam. The superheated steam passes through piping (not shown), is supplied to a turbine (not shown) outside the CFB boiler 1, and is used for power generation. The economizer transfers the heat of the exhaust gas to the boiler feed water to preheat the boiler feed water.
  • various heat exchange tubes for example, a superheater for generating superheated steam, an economizer for preheating boiler feed water, etc.
  • the first return line 8 functions to return the fly ash separated from the exhaust gas G by the first cyclone separator 4 (that is, part of the fluidized medium separated from the exhaust gas G) to the lower part of the combustion furnace 2. It is a thing.
  • the first return line 8 consists of a pipeline connected to the lower part of the combustion furnace 2, and a loop seal 8A is provided on the way.
  • the loop seal 8A is equipment that prevents the exhaust gas G from the combustion furnace 2 from flowing back. Fluid medium fed from the first cyclone separator 4 is accumulated in the loop seal 8A. Further, the fluid medium in the loop seal 8A is introduced into the combustion furnace 2 from the return chute portion 8B at the exit of the loop seal 8A.
  • the CO 2 recovery unit 100 functions to recover CO 2 from the exhaust gas G generated in the combustion furnace 2 .
  • the CO 2 recovery unit 100 has a housing 110 provided with an intake 120 for taking in the exhaust gas G, and a fluid medium 130 that flows inside the housing 110.
  • the intake of the housing 110 120, the exhaust gas G generated in the combustion furnace 2 flows through the first cyclone separator 4 and the heat recovery section 6 in sequence.
  • a connection pipe 121 connecting the heat recovery unit 6 and the intake port 120 of the housing 110 is provided with a controllable on-off valve 122 .
  • the opening/closing valve 122 By controlling the opening/closing valve 122 to be opened by the central processing unit 200, the flow of the exhaust gas G from the heat recovery unit 6 to the housing 110 becomes possible, while the central processing unit 200 is controlling the opening/closing valve 122 to be closed. By doing so, the inflow of the exhaust gas G from the heat recovery unit 6 to the housing 110 is blocked.
  • a fluidized medium (mainly composed of quartz particles or the like) that is introduced into the combustion furnace 2 and containing iron and steel slag is used as the fluidized medium 130 .
  • Iron and steel slag contains alkaline substances such as calcium oxide (CaO) and magnesium oxide (MgO), and such alkaline substances react with CO 2 contained in the exhaust gas G to produce carbonates. 2 can be immobilized and recovered.
  • the alkaline substance is calcium oxide (CaO)
  • the following chemical reaction produces calcium carbonate (CaCO 3 ) as a carbonate, while immobilizing CO 2 .
  • the fluidized medium 130 is introduced into the housing 110 before the exhaust gas G generated in the combustion furnace 2 is introduced into the housing 110.
  • a flow medium 130 is adapted to flow to facilitate CO2 capture.
  • the proportion of the alkaline substance contained in the fluid medium 130 gradually decreases. Supplementation is preferred. Note that only steel slag may be employed as the fluid medium 130 .
  • a discharge port (not shown) is provided for discharging the bottom ash BA containing carbonates produced along with the CO 2 recovery (fixation).
  • the discharge port is provided with a bottom ash discharge adjustment mechanism capable of changing the amount of bottom ash BA withdrawn. The amount of bottom ash BA (and carbonate contained therein) extracted from 110 is adjusted.
  • the housing 110 of the CO 2 recovery unit 100 is provided with an outlet 140 for discharging the exhaust gas G.
  • the exhaust gas G discharged from the discharge port 140 of the housing 110 passes through the second cyclone separator 10 and flows into the return flow path 14 .
  • the exhaust gas G that has flowed into the return flow path 14 is sucked by the suction fan 14A and returned to the heat recovery section 6 for heat recovery again.
  • the second cyclone separator 10 is arranged adjacent to the CO 2 capture section 100 and is connected to the housing 110 via the outlet 140 .
  • the second cyclone separator 10 receives the exhaust gas G discharged from the housing 110 of the CO 2 recovery unit 100 and the fluid medium 130 accompanying the exhaust gas G, and separates the exhaust gas G and the fluid medium 130 by centrifugal separation. Then, the fluid medium 130 is returned to the housing 110 , and the exhaust gas G is sent to the heat recovery section 6 via the return flow path 14 .
  • a second return line 12 is connected to the second cyclone separator 10 .
  • the second return line 12 returns the fly ash separated from the exhaust gas G in the second cyclone separator 10 (that is, part of the fluidized medium 130 separated from the exhaust gas G) to the lower part of the CO 2 recovery unit 100. function.
  • the second return line 12 consists of a pipeline connected to the lower part of the housing 110 of the CO 2 recovery unit 100, and a loop seal 12A is provided on the way.
  • the loop seal 12 ⁇ /b>A is equipment that prevents backflow of the exhaust gas G from the housing 110 .
  • Fluid medium 130 sent from the second cyclone separator 10 accumulates in the loop seal 12A. Also, the fluid medium 130 in the loop seal 12A is introduced into the housing 110 from the return chute portion 12B at the exit of the loop seal 12A.
  • a part of the exhaust gas G inside the heat recovery unit 6 (including the exhaust gas G from which CO 2 has been recovered by the CO 2 recovery unit 100) is sucked by the suction fan 18 to flow into the bag filter 16, where the exhaust gas G After being filtered and collected by the bag filter 16, fine particles such as soot and dust contained in the CFB boiler 1 are discharged from the chimney 20 to the outside of the CFB boiler 1. Dust (including fly ash FA) collected by the bag filter 16 is recovered from an unillustrated discharge port provided below the bag filter 16 .
  • the central processing unit 200 integrally controls various components of the CFB boiler 1, and includes a memory for storing various control programs, various control data, and the like, a processor for executing various control programs, and the like.
  • the central processing unit 200 adjusts the amount of fuel supplied to the combustion furnace 2 by controlling the fuel supply adjustment mechanism, and controls the fluidized medium discharge adjustment mechanism to control the fluid flow extracted from the combustion furnace 2. It is possible to adjust the amount of medium, control the combustion temperature and combustion time of the combustion furnace 2 according to the type and amount of fuel to be fed, and supply the fluid medium 130 in the housing 110 of the CO 2 recovery unit 100.
  • the bottom ash BA extracted from the housing 110 of the CO 2 recovery unit 100 (and It is now possible to adjust the amount of carbonate that is released.
  • a fluidized medium 130 containing steel slag containing an alkaline substance is introduced into the housing 110 of the CO 2 recovery unit 100 connected to the combustion furnace 2 of the CFB boiler 1 (medium introduction step: S1).
  • the medium charging step S1 is performed before the exhaust gas G generated in the combustion furnace 2 is introduced into the housing 110 .
  • the alkaline material is periodically replenished by supplying steel slag to the . That is, it is preferable that the medium feeding step S1 is periodically performed while the CFB boiler 1 is in operation.
  • the CO 2 contained in the exhaust gas introduced into the housing 110 of the CO 2 recovery unit 100 and the alkaline substance contained in the fluid medium 130 introduced into the housing 110 through the medium introduction step S1 are separated.
  • the reaction produces carbonate and recovers CO2 ( CO2 recovery step).
  • the alkaline substance is calcium oxide (CaO)
  • the following chemical reaction produces calcium carbonate (CaCO 3 ) as a carbonate while immobilizing CO 2 .
  • the exhaust gas G generated in the combustion furnace 2 is introduced into the housing 110 of the CO 2 recovery unit 100, and the CO 2 contained in the exhaust gas G introduced into the housing 110 is and an alkaline substance contained in the fluid medium 130 (steel slag) flowing within the housing 110 react with each other to generate carbonate and recover CO 2 . Therefore, it is possible to efficiently recover CO 2 at a low cost while effectively using steel slag, which has been recognized as a residue, as the fluidizing medium 130 .
  • the exhaust gas G discharged from the discharge port 140 of the housing 110 of the CO 2 recovery unit 100 is returned to the heat recovery unit 6 through the return flow path 14. Can be reused. By returning the exhaust gas G to the heat recovery unit 6 for reuse in this way, it is possible to efficiently recover the heat contained in the exhaust gas G.
  • the CFB boiler 1A includes a combustion furnace 100A, a first cyclone separator 4, a heat recovery unit 6, a first return line 8, a central processing unit 200A, etc., and the inside of the combustion furnace 100A
  • a fluidized medium 130 containing iron and steel slag into the furnace 100A
  • the CO 2 contained in the exhaust gas generated in the combustion furnace 100A is reacted with the alkaline substance contained in the iron and steel slag and recovered.
  • the combustion furnace 100A itself functions as a "CO 2 recovery section".
  • the combustion furnace 100A is an external circulation type fluidized bed combustion furnace that burns or gasifies fuel and heats water in a sealed container to generate steam. It functions as a gasification furnace in the present invention.
  • Various fuels for example, biomass fuels such as rice husks and EFB (Empty Fruit Bunches), wood chips, tires, RPF, etc.
  • a fluidized medium 130 mainly composed of quartz particles is introduced into the combustion furnace 100A through a fuel inlet.
  • F hereinafter referred to as "bed" is formed.
  • the formation of the bed F promotes fuel combustion.
  • the fluidized medium 130 includes bottom ash BA, which is formed by condensing, melting, and aggregating components of the biomass fuel with sand as a seed, or by chemically reacting on the sand surface to form particles.
  • iron and steel slag is contained in the fluidized medium 130 that is introduced into the combustion furnace 100A.
  • Iron and steel slag contains alkali substances such as calcium oxide (CaO) and magnesium oxide (MgO), and such alkali substances react with CO 2 contained in the exhaust gas G generated in the combustion furnace 100A to form carbonic acid.
  • a salt is produced to fix the CO2 so that it can be recovered.
  • the alkaline substance is calcium oxide (CaO)
  • the following chemical reaction produces calcium carbonate (CaCO 3 ) as a carbonate, while immobilizing CO 2 .
  • the fluidized medium 130 is introduced into the combustion furnace 100A before the exhaust gas G is generated in the combustion furnace 100A.
  • the ratio of the alkaline substance contained in the fluid medium 130 gradually decreases. It is preferable to replenish Note that only steel slag may be employed as the fluid medium 130 .
  • the exhaust gas G generated in the combustion furnace 100A rises inside the combustion furnace 100A while accompanying part of the fluidized medium 130.
  • a gas outlet 2A for discharging exhaust gas is provided in the upper portion of the combustion furnace 100A.
  • a discharge port (not shown) is provided for discharging the bottom ash BA containing carbonate generated along with the recovery (fixation) of CO 2 .
  • the fuel inlet of the combustion furnace 100A is provided with a fuel supply adjustment mechanism capable of changing each of the amount, composition, type of fuel, co-firing ratio, additive supply amount, and fluid medium 130 supply amount.
  • a bottom ash discharge adjustment mechanism capable of changing the amount of bottom ash BA to be discharged is provided at the discharge port of the combustion furnace 100A.
  • the central processing unit 200A By controlling these fuel supply adjustment mechanism and bottom ash discharge adjustment mechanism by the central processing unit 200A, the amount of fuel put into the combustion furnace 100A and the bottom ash BA extracted from the combustion furnace 100A (and carbonic acid contained therein) salt) will be adjusted.
  • the first cyclone separator 4, the heat recovery section 6, and the first return line 8 are substantially the same as those in the first embodiment, so detailed description thereof will be omitted.
  • a part of the exhaust gas G inside the heat recovery unit 6 (including the exhaust gas G from which CO 2 has been recovered in the combustion furnace 100A) is sucked by the suction fan 18 to pass through the bag filter 16 as in the first embodiment.
  • fine particles such as dust contained in the exhaust gas G are filtered and collected by the bag filter 16, and then discharged from the chimney 20 to the outside of the CFB boiler 1A. Dust (including fly ash FA) collected by the bag filter 16 is recovered from an unillustrated discharge port provided below the bag filter 16, as in the first embodiment.
  • the central processing unit 200A integrally controls various components of the CFB boiler 1A, and includes a memory for storing various control programs and various control data, a processor for executing various control programs, and the like.
  • the central processing unit 200A controls the fuel supply adjustment mechanism to adjust the amount of fuel supplied to the combustion furnace 100A, and controls the bottom ash discharge adjustment mechanism to control the bottom ash extracted from the combustion furnace 100A.
  • the amount of ash BA (and the carbonate contained therein) can be adjusted, and the combustion temperature and fuel input amount of the combustion furnace 100A can be controlled according to the type of fuel to be input.
  • the central processing unit 200A in this embodiment functions to achieve "low-temperature combustion" in which CO 2 is easily fixed by setting the combustion temperature in the combustion furnace 100A to 600-800°C.
  • a fluidized medium 130 containing iron and steel slag containing an alkaline substance is charged into the combustion furnace 100A of the CFB boiler 1A (medium charging step: S1A).
  • the medium feeding step S1A is performed before the exhaust gas G is generated in the combustion furnace 100A.
  • Periodic replenishment of the alkaline substance is preferred. That is, it is preferable that the medium feeding step S1A is periodically performed while the CFB boiler 1A is in operation.
  • the central processing unit 200A of the CFB boiler 1A controls various configurations so that the combustion temperature in the combustion furnace 100A is 600 to 800 ° C., thereby realizing "low temperature combustion” in which CO 2 is easily immobilized ( Low temperature combustion stroke: S2A).
  • the alkaline substance is calcium oxide (CaO)
  • the following chemical reaction produces calcium carbonate (CaCO 3 ) as a carbonate while immobilizing CO 2 .
  • the present invention is useful for efficiently recovering CO 2 contained in exhaust gas generated by a boiler.

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PCT/JP2022/033846 2021-10-12 2022-09-09 ボイラ及びｃｏ２回収方法 WO2023062988A1 (ja)

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JP2023555018A JPWO2023062988A1 (enrdf_load_stackoverflow) 2021-10-12 2022-09-09
KR1020247010825A KR20240087779A (ko) 2021-10-12 2022-09-09 보일러 및 co2회수방법

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KR (1) KR20240087779A (enrdf_load_stackoverflow)
TW (1) TWI873460B (enrdf_load_stackoverflow)
WO (1) WO2023062988A1 (enrdf_load_stackoverflow)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5375528A (en) * 1976-12-15 1978-07-05 Mitsubishi Heavy Ind Ltd Fluid combustion method
JPS648009U (enrdf_load_stackoverflow) * 1987-06-26 1989-01-17
JPH11165030A (ja) * 1997-12-05 1999-06-22 Mitsubishi Heavy Ind Ltd 排ガス中の硫酸及び無水硫酸の除去方法
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