CN214914835U - Integrated system for capturing and utilizing carbon dioxide in flue gas - Google Patents
Integrated system for capturing and utilizing carbon dioxide in flue gas Download PDFInfo
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- CN214914835U CN214914835U CN202121256097.4U CN202121256097U CN214914835U CN 214914835 U CN214914835 U CN 214914835U CN 202121256097 U CN202121256097 U CN 202121256097U CN 214914835 U CN214914835 U CN 214914835U
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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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
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Abstract
The utility model discloses an integration system is utilized in entrapment of flue gas carbon dioxide, connect ammonia tank and crystallizer in the absorption tower bottom, to the decarbonization process of desulfurization flue gas and with ammonium bicarbonate solution water conservancy diversion to the crystallizer in, the agitator fully reacts the interior material of crystallizer, the bottom of crystallizer connects the swirler, realize the layering of mixed thick liquid, through calcium carbonate discharge pump, realize extracting and utilizing calcium carbonate and ammonium sulfate, this system is rational in infrastructure, through adding the crystallization reaction of catalyst acceleration calcium carbonate, shorten reaction time, can realize the effect of online continuous processing; 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
Technical Field
The utility model belongs to the atmospheric pollutants field of purifying relates to a flue gas carbon dioxide entrapment utilizes integration system.
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, the method usually adopts stacking and landfill treatment, occupies land and pollutes the environmentIt is an industrial solid waste which is urgently to be treated. 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 (fertilizer) and calcium carbonate, so as to decarbonize and mineralize the smoke.
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.
SUMMERY OF THE UTILITY MODEL
To the problem that time cycle is long and with high costs among the gypsum coproduction ammonium sulfate and the calcium carbonate technique that exists among the prior art, the utility model provides a flue gas carbon dioxide entrapment utilizes integration system.
The utility model discloses a realize through 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%.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model relates to a flue gas carbon dioxide entrapment utilizes integrated system, connect ammonia tank and crystallizer respectively in absorption tower bottom both sides, can realize the decarbonization process to the desulfurization flue gas and with ammonium bicarbonate solution water conservancy diversion to the crystallizer in, the crystallizer sets up the agitator inside, outer wall connection catalyst replenishing pump, the agitator can realize the abundant reaction of material in the crystallizer, crystallizer bottom connection swirler, can realize the layering of mixed thick liquid, through calcium carbonate discharge pump, realize extracting and utilizing calcium carbonate and ammonium sulfate, this system is rational in infrastructure, through adding the crystallization reaction of catalyst acceleration calcium carbonate, shorten reaction time, can realize the effect of online continuous processing; 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.
Further, the utility model discloses the crystallizer top is all connected to swirler upper portion and bottom, can realize flowing back swirler upper catalyst to the crystallizer to and lower floor's gypsum thick liquid flows back to the crystallizer, realizes the cyclic utilization of catalyst and gypsum thick liquid, increases operation rate.
Further, the utility model discloses calcium carbonate conveyer and crystallizer are connected respectively at desulfurization slurrying system both ends, can realize the cyclic utilization of calcium carbonate.
Drawings
Fig. 1 is a schematic view of a structure flow of a flue gas carbon dioxide capture and utilization integrated system in an example of the present 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 utility model relates to a flue gas carbon dioxide capture and utilization integrated system, as shown in figure 1, which comprises 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 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 utility model relates to a flue gas carbon dioxide entrapment utilizes integration system when using, including following step:
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.
The utility model relates to a flue gas carbon dioxide entrapment utilizes a concrete embodiment of integration system when using, and the liquid ammonia in ammonia jar 1 lets in the distribution grid of absorption tower 13 bottom through ammonia supplementary pump 2, improves the pH of absorption liquid, and the main emergence reaction is that ammonium bicarbonate reacts with the aqueous ammonia and generates the ammonium carbonate, and the absorption liquid of absorption tower 13 bottom passes through the continuous circulation absorption flue gas CO of circulating pump absorption flue gas CO2The 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 (8)
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 2, 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%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118384682A (en) * | 2024-06-24 | 2024-07-26 | 山西绿源碳索科技有限公司 | Carbon dioxide trapping and sealing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118384682A (en) * | 2024-06-24 | 2024-07-26 | 山西绿源碳索科技有限公司 | Carbon dioxide trapping and sealing device |
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