CN113171679A - Integrated system and method for capturing and utilizing carbon dioxide in flue gas - Google Patents

Integrated system and method for capturing and utilizing carbon dioxide in flue gas Download PDF

Info

Publication number
CN113171679A
CN113171679A CN202110627435.9A CN202110627435A CN113171679A CN 113171679 A CN113171679 A CN 113171679A CN 202110627435 A CN202110627435 A CN 202110627435A CN 113171679 A CN113171679 A CN 113171679A
Authority
CN
China
Prior art keywords
catalyst
tank
calcium carbonate
flue gas
cyclone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110627435.9A
Other languages
Chinese (zh)
Inventor
杨成龙
程广文
杨嵩
郭中旭
姚明宇
蔡铭
李阳
赵瀚辰
付康丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202110627435.9A priority Critical patent/CN113171679A/en
Publication of CN113171679A publication Critical patent/CN113171679A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/24—Sulfates of ammonium
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention discloses a flue gas carbon dioxide capture and utilization integrated system and a method, wherein an ammonia tank and a crystallizing tank are connected at the bottom of an absorption tower, the decarbonization process of desulfurized flue gas and ammonium bicarbonate solution are guided into the crystallizing tank, a stirrer fully reacts the substances in the crystallizing tank, the bottom of the crystallizing tank is connected with a swirler, the layering of mixed slurry is realized, and the extraction and utilization of calcium carbonate and ammonium sulfate are realized through a calcium carbonate discharge pump; the cyclone layered recovery technology is adopted, so that the loss of the catalyst is reduced, the utilization rate of gypsum is improved, and the high-purity calcium carbonate can be obtained; meanwhile, the desulfurized gypsum slurry is used as a reaction raw material, pretreatment is not needed, and the reaction product calcium carbonate returns to the desulfurization system to be used as a desulfurization raw material, so that calcium circulation of the desulfurization system is realized, and the problems of desulfurization raw material source and desulfurization waste disposal are effectively solved.

Description

Integrated system and method for capturing and utilizing carbon dioxide in flue gas
Technical Field
The invention belongs to the field of purification of atmospheric pollutants, and relates to a flue gas carbon dioxide capture and utilization integrated system and method.
Background
Carbon emission reduction is the most realistic challenge in the coal and electricity industry, and the decarburization capability becomes an important problem of a coal-fired unit in the future.
At present, the smoke decarbonization of a coal burner unit mainly adopts a carbon capture, utilization and storage (CCUS) technology. Organic amine is used as absorbent to react with CO in smoke2Reacting to generate water-soluble salt, heating the absorption liquid to realize CO2The technology has the problems of large energy consumption, low economic benefit, secondary pollution and the like, and the trapped carbon dioxide is mainly used for geological storage and oil displacement and has the problem of secondary leakage, so that the technology for decarbonizing and recycling the flue gas with high efficiency and low cost is urgently needed to be developed.
The chemical composition of gypsum is CaSO4·2H2O, because of low quality, large yield and difficult resource utilization, is generally treated by stacking and landfill, occupies land and pollutes the environment, and is an industrial solid waste to be treated urgently. Based on CO2The new technology of direct mineralized fume decarbonization is to utilize ammonia (NH)3) And gypsum (CaSO)4) With CO in the flue gas2Reacting to produce ammonium sulfate (chemical fertilizer) and calcium carbonate, so as to decarbonize fumeIt is mineralized.
Flue gas CO2The technology of directly mineralizing gypsum to co-produce ammonium sulfate and calcium carbonate is always a research hotspot. At present, in the prior art, gypsum powder is mixed with organic alcohol amine solution and then CO is introduced2The gas generates calcium carbonate, the organic alcohol amine in the method has the function of replacing ammonia, and finally the organic alcohol amine generates organic amine sulfate, which needs to be regenerated and utilized by an electrodialysis technology, so that the regeneration cost is high, and the large-scale application cannot be realized. In summary, none of these patents relate to the development of catalytic calcium carbonate crystallization process technology, the development of carbon capture and utilization process technology coupled with a wet desulphurization pulping system, and the research of calcium circulation process technology of the desulphurization pulping system.
Disclosure of Invention
Aiming at the problems of long time period and high cost in the technology of coproducing ammonium sulfate and calcium carbonate by gypsum in the prior art, the invention provides an integrated system and method for capturing and utilizing flue gas carbon dioxide.
The invention is realized by the following technical scheme:
a flue gas carbon dioxide capture and utilization integrated system is characterized by comprising an absorption tower, a crystallizing tank, a swirler and a desulfurization pulping system;
an ammonia inlet and a slurry outlet are respectively arranged on two sides of the bottom of the absorption tower, the ammonia inlet is sequentially connected with an ammonia supply pump and an ammonia tank, and the slurry outlet is connected with a top feed inlet of a crystallization tank;
a stirrer is arranged in the crystallization tank, an output port at the bottom of the crystallization tank is sequentially connected with a crystallization discharge pump and a feed inlet of a cyclone, a catalyst feed inlet is arranged on the side wall of the middle part of the crystallization tank, and a catalyst supply pump and a catalyst tank are sequentially connected;
the side wall of the cyclone is provided with a middle outlet which is sequentially connected with a calcium carbonate discharge pump and a vacuum belt conveyor;
the vacuum belt conveyor is provided with a solid outlet and a filtrate outlet, the solid outlet is connected with the input end of the calcium carbonate conveyor, and the filtrate outlet is connected with the input end of the evaporative crystallizer;
one end of the desulfurization pulping system is provided with a desulfurization gypsum slurry pipe and is connected with an input port of the side wall of the middle part of the crystallizing tank.
Furthermore, a backflow input port is formed in the top of the crystallization tank, a catalyst backflow output port is formed in the side wall of the upper portion of the cyclone, and the catalyst backflow output port is connected with the backflow input port in the top of the crystallization tank through a catalyst backflow pump.
Furthermore, the bottom of the cyclone is provided with a gypsum slurry outlet, and the cyclone is connected with a reflux input port at the top of the crystallization tank through a gypsum reflux pump.
Furthermore, the outlet pipeline of the catalyst reflux pump and the outlet pipeline of the gypsum reflux pump are converged and then connected with a reflux inlet at the top of the crystallization tank.
Further, the input end of the desulfurization pulping system is connected with the output end of the calcium carbonate conveyor.
Further, the height of a pipe orifice of the catalyst return pump at the output end of the cyclone is at least 50cm larger than that of the calcium carbonate discharge pump.
Further, the absorption tower adopts a spray tower or a packed tower.
Further, the catalyst in the catalyst tank adopts water-insoluble organic tertiary amine with the mass concentration of 1-5%.
A method for integrating capture and utilization of carbon dioxide in flue gas is characterized by comprising the following steps:
the desulfurized flue gas enters from the bottom of the absorption tower and is in circulating countercurrent contact with the ammonia water provided by the ammonia tank to carry out decarburization reaction, and CO in the desulfurized flue gas is removed2And discharging;
discharging ammonium bicarbonate solution generated by the decarburization reaction from a slurry outlet at the bottom of the absorption tower to a crystallizing tank, mixing the ammonium bicarbonate solution with gypsum slurry provided by a desulfurization pulping system, and continuously introducing an insoluble catalyst into a catalyst tank through a catalyst feed inlet of the crystallizing tank;
the stirrer is stirred in the crystallizing tank to generate catalytic crystallization reaction, mixed slurry at the bottom of the crystallizing tank is pumped into a cyclone through a crystallization discharge pump, and the mixed slurry is separated in the cyclone;
pumping the separated crystalline calcium carbonate into a vacuum belt conveyor through a calcium carbonate discharge pump at an outlet in the middle of the cyclone; calcium carbonate filtered by the vacuum belt conveyor is conveyed to a desulfurization pulping system through a calcium carbonate conveyor through a solid outlet to be used as a desulfurization raw material, filtrate of the vacuum belt conveyor is rich in ammonium sulfate solution, and the filtrate enters an evaporative crystallizer to be evaporated, crystallized and separated to obtain ammonium sulfate.
And further, three-layer separation of the mixed slurry in a cyclone is realized, the upper layer rich in insoluble catalyst is pumped into a catalyst reflux pump and pumped back into a crystallization tank for recycling, the bottom layer rich in residual calcium sulfate is pumped into a gypsum reflux pump and pumped back into the crystallization tank for reaction again, the middle layer rich in calcium carbonate generated by crystallization is pumped into a calcium carbonate discharge pump and pumped into a vacuum belt conveyor.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the integrated system for capturing and utilizing the carbon dioxide in the flue gas, the ammonia tank and the crystallizing tank are respectively connected to the two sides of the bottom of the absorption tower, the decarbonization process of the desulfurized flue gas can be realized, the ammonium bicarbonate solution is guided into the crystallizing tank, the stirrer is arranged in the crystallizing tank, the outer wall of the crystallizing tank is connected with the catalyst replenishing pump, the stirrer can realize the full reaction of substances in the crystallizing tank, the bottom of the crystallizing tank is connected with the swirler, the layering of mixed slurry can be realized, the extraction and utilization of calcium carbonate and ammonium sulfate are realized through the calcium carbonate discharge pump, the structure of the system is reasonable, the crystallization reaction of the calcium carbonate is accelerated by adding the catalyst, the reaction time is shortened, and the effect of online continuous treatment can be realized; the cyclone layered recovery technology is adopted, so that the loss of the catalyst is reduced, the utilization rate of gypsum is improved, and the high-purity calcium carbonate can be obtained; the system is coupled with a limestone-gypsum desulfurization system, desulfurization gypsum slurry is used as a reaction raw material, pretreatment is not needed, and a reaction product calcium carbonate returns to the desulfurization system to serve as a desulfurization raw material, so that calcium circulation of the desulfurization system is realized, and the problems of desulfurization raw material source and desulfurization waste disposal are effectively solved.
Furthermore, the upper part and the bottom of the cyclone are both connected with the top of the crystallizing tank, so that the catalyst on the upper layer of the cyclone can be refluxed to the crystallizing tank, and the gypsum slurry on the lower layer of the cyclone can be refluxed to the crystallizing tank, so that the catalyst and the gypsum slurry can be recycled, and the utilization rate is improved.
Furthermore, the two ends of the desulfurization pulping system are respectively connected with the calcium carbonate conveyor and the crystallizing tank, so that the cyclic utilization of calcium carbonate can be realized.
The invention relates to a flue gas carbon dioxide capture and utilization integrated method, wherein desulfurized flue gas reacts with ammonia water to generate ammonium bicarbonate solution, the ammonium bicarbonate solution, a catalyst and gypsum slurry are respectively guided to a crystallizing tank and are fully mixed by a stirrer, and because the densities of various substances are different, a cyclone realizes layering under the action of cyclone centrifugation, and middle calcium carbonate is extracted and separated to obtain calcium carbonate and ammonium sulfate crystals; the method has low flue gas decarburization and utilization cost, can realize continuous online treatment of large flue gas amount, and can realize calcium circulation with a desulfurization pulping system.
Furthermore, the mixed slurry is separated into three layers in the cyclone, wherein the upper layer is rich in insoluble catalyst, the insoluble catalyst is introduced into the catalyst reflux pump and pumped back to the crystallization tank for recycling, the bottom layer is rich in residual calcium sulfate, and the insoluble catalyst is introduced into the gypsum reflux pump and pumped back to the crystallization tank for reaction again, so that the utilization rate of the catalyst and the gypsum is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic structural flow diagram of an integrated system for capturing and utilizing carbon dioxide in flue gas according to an embodiment of the invention.
In the figure: an ammonia tank 1; an ammonia supply pump 2; a catalyst tank 3; a catalyst replenishment pump 4; a crystallization tank 5; a crystal discharge pump 6; a swirler 7; a gypsum reflux pump 8; a calcium carbonate conveyor 9; an evaporative crystallizer 10; a vacuum belt conveyor 11; a calcium carbonate discharge pump 12; an absorption tower 13; a desulfurized gypsum slurry pipe 14; a stirrer 15; a catalyst reflux pump 16; and a desulfurization pulping system 17.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a flue gas carbon dioxide capture and utilization integrated system, which comprises an absorption tower 13, a crystallizing tank 5, a cyclone 7 and a desulfurization pulping system 17 as shown in figure 1; an ammonia inlet and a slurry outlet are respectively arranged on two sides of the bottom of the absorption tower 13, the ammonia inlet on one side of the bottom of the absorption tower 13 is connected with the output end of the ammonia tank 1, the ammonia inlet of the absorption tower 13 is provided with an ammonia supply pump 2, and the slurry outlet on the other side of the bottom is connected with a top feed inlet of the crystallization tank 5;
wherein, the stirrer 15 is arranged in the crystallization tank 5, and the stirrer 15 penetrates through the crystallization tank 5 from top to bottom, so that the mixed solution in the crystallization tank 5 can be fully stirred; the bottom of the crystallizing tank 5 is provided with an output port, and is sequentially connected with a crystallization discharge pump 6 and a top feed inlet of a swirler 7, the side wall of the middle part of the crystallizing tank 5 is provided with a catalyst feed inlet, and is sequentially connected with a catalyst replenishing pump 4 and a catalyst tank 3; the side wall of the cyclone 7 is provided with a middle outlet, and is sequentially connected with a calcium carbonate discharge pump 12 and a vacuum belt conveyor 11; the vacuum belt conveyor 11 is provided with a solid outlet and a filtrate outlet, the solid outlet is connected with the input end of the calcium carbonate conveyor 9, the input end of the desulfurization pulping system 17 is connected with the output end of the calcium carbonate conveyor 9, and the filtrate outlet is connected with the input end of the evaporative crystallizer 10;
wherein, one end of the desulfurization pulping system 17 is provided with a desulfurization gypsum slurry pipe 14 and is connected with the input port of the side wall of the middle part of the crystallizing tank 5, so as to form the cyclic utilization of calcium carbonate.
Wherein, the top of the crystallization tank 5 is provided with a reflux input port, the side wall of the upper part of the swirler 7 is provided with a catalyst reflux output port, and the catalyst reflux output port is connected with the reflux input port through a catalyst reflux pump 16; the bottom of the cyclone 7 is provided with a gypsum slurry outlet and is connected with a reflux input port at the top of the crystallization tank 5 through a gypsum reflux pump 8; the outlet pipelines of the catalyst reflux pump 16 and the gypsum reflux pump 8 are converged and then connected with a reflux input port at the top of the crystallization tank 5.
The height of the nozzle of the catalyst return pump 16 at the output end of the cyclone 7 is at least 50cm greater than that of the calcium carbonate discharge pump 12; the absorption tower 13 includes a spray tower or a packed tower; the catalyst in the catalyst tank 3 comprises water-insoluble organic tertiary amine with the mass concentration of 1-5%.
The system divides the mineralization reaction process into two steps, namely an ammonium bicarbonate generation process and a calcium carbonate crystal generation process, wherein the generation of calcium carbonate is the main control step of the system; the system has reasonable design, simple system and low flue gas decarburization and utilization cost, and can realize continuous online treatment of large flue gas volume.
The invention discloses an integrated method for capturing and utilizing carbon dioxide in flue gas, which comprises the following steps:
the desulfurized flue gas enters from the bottom of the absorption tower 13 and is in circulating countercurrent contact with the ammonia water provided by the ammonia tank 1 to carry out decarburization reaction, and CO in the desulfurized flue gas is removed2And discharging;
discharging ammonium bicarbonate solution generated by the decarburization reaction from a slurry outlet at the bottom of the absorption tower 13 to the crystallizing tank 5, mixing the ammonium bicarbonate solution with gypsum slurry provided by the desulfurization pulping system 17, and continuously introducing insoluble catalyst into the catalyst tank 3 through a catalyst feed inlet of the crystallizing tank 5;
the stirrer 15 is stirred in the crystallizing tank 5 to generate catalytic crystallization reaction, the mixed slurry at the bottom of the crystallizing tank 5 is pumped into the cyclone 7 through the crystallization discharge pump 6, and the mixed slurry is separated in the cyclone 7;
the separated crystalline calcium carbonate is pumped into a vacuum belt conveyor 11 through a calcium carbonate discharge pump 12 at the middle outlet of the cyclone 7; calcium carbonate filtered by the vacuum belt conveyor 11 is conveyed to a desulfurization pulping system 17 through a calcium carbonate conveyor 9 through a solid outlet to be used as a desulfurization raw material, filtrate of the vacuum belt conveyor 11 is rich in ammonium sulfate solution, and the filtrate enters an evaporative crystallizer 10 to be evaporated, crystallized and separated to obtain ammonium sulfate.
Wherein, the mixed slurry is separated into three layers in the cyclone 7, the upper layer is rich in insoluble catalyst and is pumped into the catalyst reflux pump 16 to be pumped into the crystallization tank 5 for recycling, the bottom layer is rich in residual calcium sulfate and is pumped into the gypsum reflux pump 8 to be pumped into the crystallization tank 5 for reaction again, the middle layer is rich in calcium carbonate generated by crystallization, and the calcium carbonate is pumped into the vacuum belt conveyor 11 by the calcium carbonate discharge pump 12.
According to a specific embodiment of the integrated method for capturing and utilizing carbon dioxide in flue gas, liquid ammonia in an ammonia tank 1 is introduced into a distribution grid at the bottom of an absorption tower 13 through an ammonia supplementing pump 2, the pH of absorption liquid is improved, the reaction mainly occurs in that ammonium bicarbonate and ammonia water react to generate ammonium carbonate, and the absorption liquid at the bottom of the absorption tower 13 continuously and circularly absorbs CO in flue gas through a circulating pump2The concentration of the formed slurry is between 5 and 20 percent;
pumping out the thick slurry at the bottom of the absorption tower 13, introducing the thick slurry into a crystallizing tank 5, simultaneously supplementing gypsum slurry and insoluble organic amine catalyst tributylamine into the crystallizing tank 5 through a desulfurized gypsum slurry pipe 14 and a catalyst supplementing pump 4, wherein the nitrogen-sulfur molar ratio of the ammonium bicarbonate solution to the desulfurized gypsum slurry is controlled between 2 and 2.5, the addition amount of the catalyst tributylamine is 1 to 5 percent of the mass concentration, and the ammonium bicarbonate solution and the desulfurized gypsum slurry are fully mixed under the action of a stirrer 15 to generate catalytic accelerated crystallization reaction;
slurry at the bottom of the crystallization tank 5 is pumped into a cyclone 7 through a crystallization discharge pump 6, due to the difference of densities of insoluble catalyst tributylamine, gypsum slurry and calcium carbonate slurry, the slurry is layered under the cyclone 7 cyclone centrifugal action, the upper layer is rich in insoluble catalyst and is pumped back to the crystallization tank 5 through a catalyst reflux pump 16 for recycling, the bottom layer is rich in residual calcium sulfate and is pumped back to the crystallization tank 5 through a gypsum reflux pump 8 for reaction again, the middle layer is rich in calcium carbonate generated by crystallization, and the slurry is pumped into a vacuum belt conveyor 11 through a calcium carbonate discharge pump 12;
the solid filtered by the vacuum belt conveyor 11 is calcium carbonate, and is transported to a desulfurization pulping system 17 through a calcium carbonate conveyor 9 to be used as a desulfurization raw material, the filtrate of the vacuum belt conveyor 11 is a solution rich in ammonium sulfate, and the solution enters an evaporative crystallizer 10 to be evaporated, crystallized and separated to obtain ammonium sulfate.

Claims (10)

1. A flue gas carbon dioxide capture and utilization integrated system is characterized by comprising an absorption tower (13), a crystallizing tank (5), a swirler (7) and a desulfurization pulping system (17);
an ammonia inlet and a slurry outlet are respectively arranged on two sides of the bottom of the absorption tower (13), the ammonia inlet is sequentially connected with an ammonia supply pump (2) and an ammonia tank (1), and the slurry outlet is connected with a top feed inlet of a crystallization tank (5);
a stirrer (15) is arranged in the crystallization tank (5), a bottom output port is sequentially connected with a crystallization discharge pump (6) and a feed inlet of a cyclone (7), a catalyst feed inlet is arranged on the side wall of the middle part of the crystallization tank (5), and a catalyst replenishing pump (4) and a catalyst tank (3) are sequentially connected;
the side wall of the cyclone (7) is provided with a middle outlet, and is sequentially connected with a calcium carbonate discharge pump (12) and a vacuum belt conveyor (11);
the vacuum belt conveyor (11) is provided with a solid outlet and a filtrate outlet, the solid outlet is connected with the input end of the calcium carbonate conveyor (9), and the filtrate outlet is connected with the input end of the evaporative crystallizer (10);
one end of the desulfurization pulping system (17) is provided with a desulfurization gypsum slurry pipe (14) and is connected with an input port of the side wall of the middle part of the crystallizing tank (5).
2. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 1, wherein a reflux input port is arranged at the top of the crystallization tank (5), a catalyst reflux output port is arranged on the side wall of the upper part of the cyclone (7), and the catalyst reflux output port is connected with the reflux input port at the top of the crystallization tank (5) through a catalyst reflux pump (16).
3. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 2, wherein the bottom of the cyclone (7) is provided with a gypsum slurry outlet, and is connected with a reflux input port at the top of the crystallizing tank (5) through a gypsum reflux pump (8).
4. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 3, wherein the outlet pipeline of the catalyst return pump (16) and the outlet pipeline of the gypsum return pump (8) are merged and then connected with the return input port at the top of the crystallizing tank (5).
5. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 1, wherein the input end of the desulfurization and pulping system (17) is connected with the output end of the calcium carbonate conveyor (9).
6. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 1, wherein the height of the nozzle of the outlet end of the catalyst return pump (16) on the cyclone (7) is at least 50cm larger than that of the calcium carbonate discharge pump (12).
7. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 1, wherein the absorption tower (13) adopts a spray tower or a packed tower.
8. The integrated system for capturing and utilizing carbon dioxide in flue gas as claimed in claim 1, wherein the catalyst in the catalyst tank (3) adopts water-insoluble organic tertiary amine with the mass concentration of 1% -5%.
9. A method for integrating capturing and utilizing carbon dioxide in flue gas, which is characterized in that based on any one of the systems in claims 1-8, the method comprises the following steps:
the desulfurized flue gas enters from the bottom of the absorption tower (13) and is in circulating countercurrent contact with the ammonia water provided by the ammonia tank (1) to carry out decarburization reaction to remove CO in the desulfurized flue gas2And discharging;
discharging ammonium bicarbonate solution generated by the decarburization reaction from a slurry outlet at the bottom of the absorption tower (13) to a crystallization tank (5), mixing the ammonium bicarbonate solution with gypsum slurry provided by a desulfurization pulping system (17), and continuously introducing an insoluble catalyst into a catalyst tank (3) through a catalyst feed inlet of the crystallization tank (5);
the stirrer (15) is stirred in the crystallizing tank (5) to generate catalytic crystallization reaction, the mixed slurry at the bottom of the crystallizing tank (5) is pumped into the cyclone (7) through the crystallization discharge pump (6), and the mixed slurry is separated in the cyclone (7);
the separated crystalline calcium carbonate is pumped into a vacuum belt conveyor (11) through a calcium carbonate discharge pump (12) at the middle outlet of the cyclone (7); calcium carbonate filtered by the vacuum belt conveyor (11) is conveyed to a desulfurization pulping system (17) through a calcium carbonate conveyor (9) through a solid outlet to be used as a desulfurization raw material, filtrate of the vacuum belt conveyor (11) is rich in ammonium sulfate solution, and the solution enters an evaporation crystallizer (10) to be evaporated, crystallized and separated to obtain ammonium sulfate.
10. The integrated method for capturing and utilizing the carbon dioxide in the flue gas as claimed in claim 9, wherein the mixed slurry is separated into three layers in a cyclone (7), the upper layer is rich in the insoluble catalyst and is pumped back to the crystallization tank (5) by a catalyst reflux pump (16) for recycling, the bottom layer is rich in the residual calcium sulfate and is pumped back to the crystallization tank (5) by a gypsum reflux pump (8) for reacting again, the middle layer is rich in the calcium carbonate generated by crystallization, and the middle layer is pumped into a vacuum belt conveyor (11) by a calcium carbonate discharge pump (12).
CN202110627435.9A 2021-06-04 2021-06-04 Integrated system and method for capturing and utilizing carbon dioxide in flue gas Pending CN113171679A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110627435.9A CN113171679A (en) 2021-06-04 2021-06-04 Integrated system and method for capturing and utilizing carbon dioxide in flue gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110627435.9A CN113171679A (en) 2021-06-04 2021-06-04 Integrated system and method for capturing and utilizing carbon dioxide in flue gas

Publications (1)

Publication Number Publication Date
CN113171679A true CN113171679A (en) 2021-07-27

Family

ID=76927427

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110627435.9A Pending CN113171679A (en) 2021-06-04 2021-06-04 Integrated system and method for capturing and utilizing carbon dioxide in flue gas

Country Status (1)

Country Link
CN (1) CN113171679A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113877414A (en) * 2021-10-25 2022-01-04 西安热工研究院有限公司 Flue gas CO capture based on magnetic activated carbon immobilized carbonic anhydrase2System and method
CN115615066A (en) * 2022-12-21 2023-01-17 苏州仕净科技股份有限公司 Novel carbon emission reduction refrigeration cycle method
CN116116185A (en) * 2023-01-31 2023-05-16 西安热工研究院有限公司 System and method for directly mineralizing flue gas carbon dioxide by using desulfurization gypsum
WO2023166481A1 (en) * 2022-03-03 2023-09-07 Politecnico Di Milano Process of carbon dioxide sequestration and relative transformation into high value-added chemicals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113877414A (en) * 2021-10-25 2022-01-04 西安热工研究院有限公司 Flue gas CO capture based on magnetic activated carbon immobilized carbonic anhydrase2System and method
CN113877414B (en) * 2021-10-25 2024-04-23 西安热工研究院有限公司 Magnetic activated carbon-based immobilized carbonic anhydrase for capturing CO in flue gas2System and method
WO2023166481A1 (en) * 2022-03-03 2023-09-07 Politecnico Di Milano Process of carbon dioxide sequestration and relative transformation into high value-added chemicals
CN115615066A (en) * 2022-12-21 2023-01-17 苏州仕净科技股份有限公司 Novel carbon emission reduction refrigeration cycle method
CN116116185A (en) * 2023-01-31 2023-05-16 西安热工研究院有限公司 System and method for directly mineralizing flue gas carbon dioxide by using desulfurization gypsum

Similar Documents

Publication Publication Date Title
CN113171679A (en) Integrated system and method for capturing and utilizing carbon dioxide in flue gas
CN101934191B (en) Method for desulfurizing and denitrating smoke simultaneously through ammonia method
CN105854560B (en) The method of flue gas desulfurization and denitrification
CN101879404B (en) Recycled flue gas desulfurization and denitration method
CN200998639Y (en) Concentrated crystallization and absorbed oxidation combined type ammonia process desulfuration tower
CN100435910C (en) Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus
CN103977689B (en) Device and method for removing sulfur dioxide in smoke by two-step alkalifying reproducing and sodium sulfite method
CN102489132B (en) Novel dual-alkali desulfurization method for removal of sulfur dioxide from flue gas and generation of elemental sulfur as byproduct
CN101745305A (en) Method for removing various gaseous pollutants from smoke gas
AU2010201373A1 (en) System and methods for processing CO2
CN113181751A (en) System and method for directly mineralizing flue gas carbon dioxide by using gypsum
CN101797466A (en) Wet flue gas desulphurizing method utilizing carbide slag slurry and device thereof
KR20230004591A (en) Integrated ammonia-based desulfurization and decarbonization apparatus and method
CN103007721B (en) Ammonia circulation-based method and device for carbonating fixation of CO2 in coal-fired flue gas
US5510094A (en) Ammonia-limestone scrubbing with by-product for use in agriculture
CN101347706A (en) Flue gas desulfurization technique using dual alkali method with acetylene sludge as recycling agent
CN113171678A (en) System and method for directly mineralizing flue gas carbon dioxide based on three-phase fluidized bed
CN108686477A (en) A kind of sulfur removal technology and equipment reducing ammonia and doctor solution escape
CN214809744U (en) System for directly mineralizing flue gas carbon dioxide based on three-phase fluidized bed
CN103977686A (en) Ammonia desulfurization and denitration type flue gas purification system
CN214914835U (en) Integrated system for capturing and utilizing carbon dioxide in flue gas
CN105032173A (en) Device and process of ammonia-soda-process combined desulfurization and denitrification
CN202161921U (en) Ammonia regenerative desulphurization device
CN205517223U (en) Flue gas desulfurization zero release money source processing system
CN111644043A (en) Method and device for deeply removing sulfur dioxide in flue gas and efficiently removing gaseous heavy metal selenium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination