CN115475502A - Method and system for capturing carbon dioxide containing carbon dioxide emission tail gas - Google Patents
Method and system for capturing carbon dioxide containing carbon dioxide emission tail gas Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 31
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 60
- 238000003860 storage Methods 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims abstract description 46
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 43
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 43
- 239000012528 membrane Substances 0.000 claims abstract description 42
- 239000011259 mixed solution Substances 0.000 claims abstract description 41
- 238000011084 recovery Methods 0.000 claims abstract description 31
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 27
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 27
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 27
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 24
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 24
- 230000005587 bubbling Effects 0.000 claims abstract description 24
- 239000000243 solution Substances 0.000 claims abstract description 21
- 238000000909 electrodialysis Methods 0.000 claims abstract description 19
- 239000002918 waste heat Substances 0.000 claims abstract description 16
- 238000010926 purge Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 239000001117 sulphuric acid Substances 0.000 claims description 8
- 235000011149 sulphuric acid Nutrition 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- JTXJZBMXQMTSQN-UHFFFAOYSA-N amino hydrogen carbonate Chemical compound NOC(O)=O JTXJZBMXQMTSQN-UHFFFAOYSA-N 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 241000197194 Bulla Species 0.000 description 6
- 208000002352 blister Diseases 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000002803 fossil fuel Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101100272279 Beauveria bassiana Beas gene Proteins 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- PRKQVKDSMLBJBJ-UHFFFAOYSA-N ammonium carbonate Chemical compound N.N.OC(O)=O PRKQVKDSMLBJBJ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 108010066278 cabin-4 Proteins 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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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
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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
- B01D53/74—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
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a method for capturing carbon dioxide containing carbon dioxide emission tail gas, which comprises the steps of carrying out bubbling reaction on the emission tail gas and an alkaline ammonia water solution to prepare a mixed solution of ammonium bicarbonate; leading out the ammonium bicarbonate mixed solution to react with sulfuric acid to generate carbon dioxide and reaction mixed solution; performing membrane removal on the reaction mixed solution to generate a mixed solution of trapped carbon dioxide and ammonium sulfate, and performing carbon dioxide collection and storage through vacuumizing or gas purging; and (3) performing bipolar membrane electrodialysis on the ammonium sulfate mixed solution to convert the ammonium sulfate mixed solution into sulfuric acid and ammonia water, wherein the ammonia water and the sulfuric acid participate in circulation. The invention meets the requirement of high-efficiency recovery of carbon dioxide, can realize high-efficiency circulation of sulfuric acid and ammonia water, reduces the recovery cost of carbon dioxide, and maintains stable and high-efficiency operation of recovery operation. Through the combination of the front-end bubbling reaction and the reaction of the back-end sulfuric acid, the recovery rate of carbon dioxide is improved, and the method has higher economic value. The system has the function of waste heat utilization, effectively reduces the reaction energy consumption of the system, and is particularly suitable for recovering the tail gas discharged by a power plant.
Description
Technical Field
The invention relates to a method and a system for capturing carbon dioxide containing carbon dioxide emission tail gas, belonging to the technical field of carbon dioxide recovery.
Background
Human activities such as the production of energy by burning fossil fuels emit large quantities of carbon dioxide (and other acidic gases such as sulfur dioxide and hydrogen chloride) into the atmosphere. Carbon dioxide is an important greenhouse gas. Elevated atmospheric carbon dioxide concentrations are widely recognized as a major cause of global climate change or global warming and surface ocean acidification. The United Nations Climate Change Framework Convention (United Nations Framework Convention on Climate Change) in the Copenhagen protocol (Copenhagen accession, 2009) emphasizes that Climate Change is one of the greatest challenges of the present era, and therefore, a common goal of controlling the global temperature rise amplitude below 2 ℃ is established. It is widely accepted by the international scientific community that in order to control the global temperature rise below 2 ℃, the annual emission of global greenhouse gases must be reduced to half of the emission in 1990 before 2050.
Currently 80% of the energy worldwide comes from fossil fuels and the earth reserves very abundant fossil fuels, especially coal. In view of the present and foreseeable future need for human beings to rely on fossil fuels, it is particularly important and urgent to find or invent an effective, economical and environmentally responsible method for sequestration of carbon dioxide. Only with such a method we can achieve the goal of carbon dioxide abatement while continuing to rely on fossil fuels.
Chinese patent publication No. CN101992015a provides a method for sequestering carbon dioxide in a gas, which discloses absorbing a part of carbon dioxide in the exhaust gas by an alkaline ammoniated solution, and absorbing the carbon dioxide to convert into ammonium carbonate salt and precipitate out. The method adopts the reaction of ammonium salt and alkaline substances to generate ammonia gas, and realizes carbon dioxide recovery by absorbing carbon dioxide with alkaline ammoniated solution to separate out bicarbonate, and has the problems of low system circulation rate and the like.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a method and a system for capturing carbon dioxide containing carbon dioxide emission tail gas aiming at the problems of unstable recovery rate of the traditional carbon dioxide and poor cycle sustainability and high energy consumption.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method for capturing the carbon dioxide in the tail gas containing the carbon dioxide comprises the following steps:
s1, carrying out bubbling reaction on the discharged tail gas and a basic ammonia water solution to prepare an ammonia bicarbonate mixed solution;
s2, leading out the ammonium bicarbonate mixed solution, reacting with sulfuric acid to generate carbon dioxide and reaction mixed solution;
s3, performing membrane removal on the reaction mixed solution to generate a mixed solution of trapped carbon dioxide and ammonium sulfate, and performing carbon dioxide collection and storage through vacuumizing or gas purging;
and S4, performing bipolar membrane electrodialysis on the ammonium sulfate mixed solution to convert the ammonium sulfate mixed solution into sulfuric acid and ammonia water, wherein the ammonia water enters the step S1 for cyclic reaction, and the sulfuric acid enters the step S2 for cyclic reaction.
Preferably, in the step S1, the mixed solution of ammonium bicarbonate is led out and stored, and waste heat recovery and heat preservation are performed by using waste heat of exhaust gas and waste heat of bubble reaction.
Preferably, the temperature of the waste heat recovery heat preservation is at least 45 ℃.
Preferably, in the step S1, after the bubbling reaction, off-gas recovery is performed.
Preferably, in the step S1, the alkaline aqueous ammonia solution is supplied to a PH of 12 at a water content of 16.8%.
Preferably, in the step S2, the reaction temperature of the ammonium bicarbonate mixed solution and the sulfuric acid is 20 ℃ ± 2 ℃.
The invention also provides a carbon dioxide capturing system, which comprises a bubbling reactor, an alkaline ammonia water solution storage tank, an ammonia bicarbonate mixed solution storage tank, an ammonium bicarbonate reaction cabin, a sulfuric acid storage tank, a carbon dioxide collecting and storing cabin, a membrane removal system, an ammonium sulfate mixed solution storage tank and a bipolar membrane electrodialysis system,
the alkaline ammonia water solution storage tank with the tympanic bulla reactor feed links to each other, the tympanic bulla reactor with alkaline ammonia water solution storage tank feed links to each other, alkaline ammonia water solution storage tank with the mixed liquid storage tank feed of ammonium bicarbonate links to each other, the sulphuric acid storage tank with ammonium bicarbonate reaction cabin feed links to each other, membrane takes off the system with ammonium bicarbonate reaction cabin respectively with carbon dioxide collects the storage cabin and links to each other, the play liquid end of membrane takes off the system with the mixed liquid storage tank of ammonium sulfate links to each other, the mixed liquid storage tank of ammonium sulfate with bipolar membrane electrodialysis system links to each other, bipolar membrane electrodialysis system respectively with the tympanic bulla reactor with the sulphuric acid storage tank links to each other.
Preferably, a preheating recovery system is arranged between the bubbling reactor and the alkaline ammonia water solution storage tank.
Preferably, a pH detection sensor and an ammonia water concentration determinator are arranged in the bubbling reactor.
Preferably, the ammonium bicarbonate reaction cabin is provided with a temperature control device.
The invention has the following beneficial effects:
1. the requirement of high-efficiency recovery of carbon dioxide is met, high-efficiency circulation of sulfuric acid and ammonia water can be realized, the recovery cost of carbon dioxide is reduced, and stable and high-efficiency operation of recovery operation is maintained.
2. Through the combination of the front-end bubbling reaction and the reaction of the back-end sulfuric acid, the recovery rate of carbon dioxide is improved, and the method has higher economic value.
3. The system has the function of waste heat utilization, effectively reduces the reaction energy consumption of the system, and is particularly suitable for recovering the tail gas discharged by a power plant.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic flow diagram of a method for capturing carbon dioxide from exhaust gas from a power plant according to the present invention.
FIG. 2 is a schematic diagram of a carbon dioxide capture system for exhaust gas from a power plant according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides a method for capturing carbon dioxide in carbon dioxide-containing exhaust tail gas, which comprises the following steps as shown in figure 1:
carrying out bubbling reaction on the discharged tail gas and a basic ammonia water solution to prepare an ammonia bicarbonate mixed solution;
leading out the ammonium bicarbonate mixed solution to react with sulfuric acid to generate carbon dioxide and reaction mixed solution;
performing membrane removal on the reaction mixed solution to generate a mixed solution of trapped carbon dioxide and ammonium sulfate, and performing carbon dioxide collection and storage through vacuumizing or gas purging;
and (3) performing bipolar membrane electrodialysis on the ammonium sulfate mixed solution to convert the ammonium sulfate mixed solution into sulfuric acid and ammonia water, wherein the ammonia water enters the step S1 for cyclic reaction, and the sulfuric acid enters the step S2 for cyclic reaction.
The specific implementation process and principle description are as follows:
absorbing carbon dioxide by ammonia water: NH (NH) 3 +H 2 O＝NH 3 ·H 2 O，NH 3 ·H 2 O+CO 2 ＝NH 4 HCO 3 ；
Sulfuric acid participates in the reaction: h 2 SO 4 +2NH 4 HCO 3 (excess) =2H 2 O+2CO 2 ↑+(NH 4 ) 2 SO 4 。
In the present case, utilize the bubbling reaction to increase the absorption efficiency that the aqueous ammonia absorbed the carbon dioxide, participate in the reaction through rear end sulphuric acid and carry out the carbon dioxide release, utilize the drawing of patterns to realize ammonium sulfate infiltration recovery and gas interception simultaneously, improved the rate of recovery of carbon dioxide, adopt bipolar membrane electrodialysis to realize the conversion of sulphuric acid and alkaline aqueous ammonia at last.
In a refined manner, when a membrane removal system is vacuumized or purged with gas, the dissolution balance of gas and liquid can be destroyed; this creates a driving force for the migration of gas from the liquid to the gas phase. Since the membrane contact surface is a hydrophobic membrane, only gas is allowed to pass through, and liquid cannot pass through. The dissolved gas in the liquid is continuously taken away by vacuum or purge gas, but water cannot permeate, so that the degassing is realized. Then we can get more than 90% CO concentration at the collecting end 2 。
Bipolar membrane electrodialysis (BPED) is a new type of electrodialysis that is composed of Bipolar membranes and various configurations of negative and/or positive membranes combined together, based on the original electrodialysis. Unlike the concentration desalination function of conventional electrodialysis, its function is to convert salt solutions into acids and bases. The three-compartment bipolar membrane electrodialysis is characterized in that a bipolar membrane, a negative membrane and a positive membrane are combined to form an acid, alkali and salt three compartment, anions of salt penetrate through the negative membrane to be combined with H & lt + & gt ions generated by the bipolar membrane to generate acid, and cations penetrate through the positive membrane to be combined with OH & lt- & gt ions generated by the bipolar membrane to generate alkali. The process corresponds to the reverse reaction process of the neutralization reaction. Thereby converting the ammonium sulfate mixed solution into sulfuric acid and alkaline ammonia water to participate in system circulation.
In one embodiment, the mixed liquid of ammonium bicarbonate is exported and stored, and waste heat of exhaust gas and waste heat of bubbling reaction are utilized for waste heat recovery and heat preservation. The temperature of the waste heat recovery heat preservation is at least 45 ℃. The basic ammonia solution was supplied at a pH of 12 and a water content of 16.8%. And recovering tail gas after the bubbling reaction.
Research shows that the CO in the flue gas of the power plant is removed 2 While the solution absorbs CO 2 Not a purely exothermic reaction; the absorption capacity can beAs high as 1.0kg (CO 2)/1 kg (ammonia), theoretical analysis and mass data calculation are carried out, and practice shows that if 16.8% of ammonia water is used, the PH value is 12, and the removal rate of carbon dioxide absorbed by the ammonia water at the temperature of 45 ℃ can reach more than 98%.
Thereby adopting two-stage CO 2 And absorption, namely, firstly, realizing sufficient gas-liquid mixing through a bubbling reaction, discharging insoluble gas, and then, carrying out absorption stabilization and maintenance through waste heat recovery and heat preservation so as to guarantee the absorption content before the rear-end cooling reaction.
When the back-end ammonium bicarbonate mixed solution reacts with the sulfuric acid, the reaction temperature is 20 +/-2 ℃. Thus, the production of ammonium sulfate and CO can be satisfied 2 Releasing the requirement and meeting the requirement of membrane separation efficiency.
In a specific embodiment, for a power plant emission tail gas related parameter monitoring, it contains 12.7% 2 、N 2 + Ar 66.7%, H 2 O is 18.1, O 2 2.5% of SO 2 23.1ppm, NOx27.8ppm, 85 ℃.
N 2 And Ar is insoluble in water, the solubility of nitrogen in water, the solubility of 17.28X 10-6 (w) of oxygen in water at 25 ℃ and the solubility of 39.45X 10-6 (w) of oxygen in water at 25 ℃ are removed in the tail gas recovery process after the bubbling reaction, and nitrogen oxides and sulfur dioxide are both acidic oxides and exist in the mixed solution as trace ammonium salts after the reaction of alkaline ammonia water.
The scheme also provides a carbon dioxide capture system which is used as an equipment foundation of the carbon dioxide capture method and comprises a bubbling reactor 1, an alkaline ammonia water solution storage tank 2, an ammonia bicarbonate mixed solution storage tank 3, an ammonium bicarbonate reaction cabin 4, a sulfuric acid storage tank 5, a carbon dioxide collecting and storing cabin 6, a membrane removal system 7, an ammonium sulfate mixed solution storage tank 8 and a bipolar membrane electrodialysis system 9 as shown in figure 2.
Specifically, the alkaline aqueous ammonia solution storage tank links to each other with the tympanic bulla reactor feed, the tympanic bulla reactor links to each other with alkaline aqueous ammonia solution storage tank feed, alkaline aqueous ammonia solution storage tank links to each other with the mixed liquid storage tank feed of ammonium bicarbonate, the sulphuric acid storage tank links to each other with ammonium bicarbonate reaction cabin feed, the membrane takes off the system and links to each other with carbon dioxide collection storage cabin respectively with ammonium bicarbonate reaction cabin, the play liquid end of membrane takes off the system and links to each other with the mixed liquid storage tank of ammonium sulfate, the mixed liquid storage tank of ammonium sulfate links to each other with bipolar membrane electrodialysis system, bipolar membrane electrodialysis system links to each other with tympanic bulla reactor and sulphuric acid storage tank respectively.
Thus meeting the reaction and operation requirements of each step of the carbon dioxide capture method.
In one embodiment, a preheating recovery system 10 is provided between the bubble reactor and the alkaline aqueous ammonia solution storage tank to meet the preheating recovery requirement.
In one embodiment, a pH sensor and an ammonia concentration meter are provided in the bubble reactor. The monitoring and allocating requirements in the reaction process and the circulation process are met.
In one embodiment, the ammonium bicarbonate reaction cabin is provided with a temperature control device to meet the requirement of temperature control monitoring.
Through the above description, the method and the system for capturing carbon dioxide containing carbon dioxide emission tail gas disclosed by the invention can meet the requirement of efficient recovery of carbon dioxide, can realize efficient circulation of sulfuric acid and ammonia water, reduce the recovery cost of carbon dioxide, and maintain stable and efficient operation of recovery operation. Through the combination of the front-end bubbling reaction and the reaction of the back-end sulfuric acid, the recovery rate of carbon dioxide is improved, and the method has higher economic value. The system has the function of waste heat utilization, effectively reduces the reaction energy consumption of the system, and is particularly suitable for recovering the tail gas discharged by a power plant.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The method for capturing the carbon dioxide in the carbon dioxide-containing exhaust tail gas is characterized by comprising the following steps of:
s1, carrying out bubbling reaction on the discharged tail gas and a basic ammonia water solution to obtain a mixed solution of ammonium bicarbonate;
s2, leading out the ammonium bicarbonate mixed solution to react with sulfuric acid to generate carbon dioxide and reaction mixed solution;
s3, performing membrane removal on the reaction mixed solution to generate a mixed solution of trapped carbon dioxide and ammonium sulfate, and performing carbon dioxide collection and storage through vacuumizing or gas purging;
and S4, performing bipolar membrane electrodialysis on the ammonium sulfate mixed solution to convert the ammonium sulfate mixed solution into sulfuric acid and ammonia water, wherein the ammonia water enters the step S1 for cyclic reaction, and the sulfuric acid enters the step S2 for cyclic reaction.
2. The method for capturing carbon dioxide in a carbon dioxide-containing exhaust gas according to claim 1, wherein:
in the step S1, the ammonium bicarbonate mixed solution is led out and stored, and waste heat of the exhaust gas and the bubbling reaction waste heat are utilized for waste heat recovery and heat preservation.
3. The method for capturing carbon dioxide in the carbon dioxide-containing exhaust gas according to claim 2, wherein:
the temperature of the waste heat recovery heat preservation is at least 45 ℃.
4. The method for capturing carbon dioxide in the carbon dioxide-containing exhaust gas of claim 1, wherein:
in the step S1, after the bubble reaction, off-gas recovery is performed.
5. The method for capturing carbon dioxide in the carbon dioxide-containing exhaust gas of claim 1, wherein:
in the step S1, the supplied alkaline aqueous ammonia solution is an alkaline aqueous ammonia solution having a water content of 16.8% and a PH of 12.
6. The method for capturing carbon dioxide in a carbon dioxide-containing exhaust gas according to claim 1, wherein:
in the step S2, the reaction temperature of the ammonium bicarbonate mixed solution and the sulfuric acid is 20 +/-2 ℃.
7. The carbon dioxide capturing system according to any one of claims 1 to 6, wherein:
comprises a bubbling reactor, an alkaline ammonia water solution storage tank, an ammonia bicarbonate mixed solution storage tank, an ammonium bicarbonate reaction cabin, a sulfuric acid storage tank, a carbon dioxide collecting and storing cabin, a membrane removing system, an ammonium sulfate mixed solution storage tank and a bipolar membrane electrodialysis system,
the alkaline ammonia water solution storage tank with the bubbling reactor feed links to each other, the bubbling reactor with the alkaline ammonia water solution storage tank feed links to each other, alkaline ammonia water solution storage tank with the mixed liquid storage tank feed of ammonium bicarbonate links to each other, the sulphuric acid storage tank with the mixed liquid storage tank feed of ammonium bicarbonate links to each other, membrane takes off the system with the ammonium bicarbonate reaction tank respectively with the storage tank is collected to carbon dioxide links to each other, the play liquid end of membrane takes off the system with the mixed liquid storage tank of ammonium sulfate links to each other, the mixed liquid storage tank of ammonium sulfate with bipolar membrane electrodialysis system links to each other, bipolar membrane electrodialysis system respectively with the bubbling reactor with sulphuric acid storage tank links to each other.
8. The carbon dioxide capture system of claim 7, wherein:
and a preheating recovery system is arranged between the bubbling reactor and the alkaline ammonia water solution storage tank.
9. The carbon dioxide capture system of claim 7, wherein:
and a PH detection sensor and an ammonia water concentration determinator are arranged in the bubbling reactor.
10. The carbon dioxide capture system of claim 7, wherein:
the ammonium bicarbonate reaction cabin is provided with a temperature control device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211263940.0A CN115475502B (en) | 2022-10-14 | 2022-10-14 | Carbon dioxide capturing method and system for tail gas containing carbon dioxide emission |
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| JPH07101703A (en) * | 1993-10-01 | 1995-04-18 | Tokuyama Corp | Sulfurous acid gas recovery method |
| CN101992015A (en) * | 2009-08-14 | 2011-03-30 | 钟少军 | Method for sequestering carbon dioxide |
| CN102612401A (en) * | 2009-11-17 | 2012-07-25 | 韩国能量技术研究院 | Apparatus for removing trace amounts of ammonia from the gas discharged during a carbon-dioxide-collecting process using aqueous ammonia |
| CN111924807A (en) * | 2020-05-26 | 2020-11-13 | 萍乡市华星环保工程技术有限公司 | Method and device for trapping carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate |
| CN114788997A (en) * | 2022-04-14 | 2022-07-26 | 中国石油大学(北京) | Flue gas CO by chemical absorption method 2 Trapping system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07101703A (en) * | 1993-10-01 | 1995-04-18 | Tokuyama Corp | Sulfurous acid gas recovery method |
| CN101992015A (en) * | 2009-08-14 | 2011-03-30 | 钟少军 | Method for sequestering carbon dioxide |
| CN102612401A (en) * | 2009-11-17 | 2012-07-25 | 韩国能量技术研究院 | Apparatus for removing trace amounts of ammonia from the gas discharged during a carbon-dioxide-collecting process using aqueous ammonia |
| CN111924807A (en) * | 2020-05-26 | 2020-11-13 | 萍乡市华星环保工程技术有限公司 | Method and device for trapping carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate |
| CN114788997A (en) * | 2022-04-14 | 2022-07-26 | 中国石油大学(北京) | Flue gas CO by chemical absorption method 2 Trapping system |
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