CN114669176A - Method for treating waste gas by calcium circulation decarburization - Google Patents
Method for treating waste gas by calcium circulation decarburization Download PDFInfo
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- CN114669176A CN114669176A CN202210409286.3A CN202210409286A CN114669176A CN 114669176 A CN114669176 A CN 114669176A CN 202210409286 A CN202210409286 A CN 202210409286A CN 114669176 A CN114669176 A CN 114669176A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005261 decarburization Methods 0.000 title claims abstract description 31
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000011575 calcium Substances 0.000 title claims abstract description 28
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 52
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 48
- 238000005507 spraying Methods 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 26
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 26
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 24
- 238000007084 catalytic combustion reaction Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 208000005156 Dehydration Diseases 0.000 claims abstract description 10
- 230000018044 dehydration Effects 0.000 claims abstract description 10
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 230000004913 activation Effects 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 239000002274 desiccant Substances 0.000 claims description 4
- 239000013618 particulate matter Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 238000004134 energy conservation Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 238000000746 purification Methods 0.000 abstract description 8
- 238000005262 decarbonization Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000000197 pyrolysis Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
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
- B01D53/343—Heat recovery
-
- 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
-
- 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
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a method for treating waste gas by utilizing calcium circulation decarburization, which is used for purifying the waste gas. The method comprises the following steps: s1 exhaust gas pretreatment. S2 is subjected to catalytic combustion processing. S3 calcium circulation decarbonization treatment is carried out. S4 collects the heat evaporated during spraying. And S5 dehydration treatment. The operation of the calcium cycle decarburization treatment method is as follows: s31 provides a spray solution containing calcium ions and water. S32 forms a spray water curtain. And S33, decarbonizing the high-temperature gas by spraying a water curtain. S34, the calcium carbonate generated by the decarburization reaction is subjected to high temperature treatment. S35 recycling the calcium ions obtained by high-temperature treatment. According to the waste gas treatment method, the calcium circulation decarburization mode is established to remove the carbon dioxide in the waste gas, in the mode, the carbon absorption rate is high, the reutilization property of decarburization components is good, the waste gas purification treatment strength is improved, the treatment cost is greatly reduced, the time required by temperature rise is short, the waste gas treatment work efficiency is high, the energy consumption is low, and the energy conservation and environmental protection properties are good.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a method for treating waste gas by utilizing calcium circulation decarburization.
Background
Waste gas generated in life and industry can be discharged after being purified, different treatment methods can be selected according to the type of the waste gas in a targeted manner, wherein, as combustible harmful components in the waste gas are converted into harmless substances through thermal oxidation by a combustion method, organic waste gas generated by petroleum industry hydrocarbon waste gas and other harmful gases, solvent industry waste gas, urban waste incineration treatment, almost all malodorous substances and the like can be removed, and therefore, the waste gas is purified by catalytic combustion more commonly. Catalytic combustion is based on catalytic activation technology, so that hydrocarbons in the exhaust gas are rapidly oxidized with oxygen molecules to produce carbon dioxide and water for purification.
However, in the current waste gas treatment, the removal of carbon dioxide in the waste gas is inconvenient, and meanwhile, the temperature rise time in the catalytic combustion link is long, so that the working efficiency of the whole waste gas treatment process is low, the energy consumption is high, and the energy conservation and environmental protection of the waste gas treatment are affected.
Disclosure of Invention
Therefore, the method for treating the waste gas by utilizing the calcium circulation decarburization is needed to solve the problems that the carbon dioxide in the waste gas is inconvenient to remove, the temperature rise time of the catalytic combustion link is long, the working efficiency of the whole waste gas treatment process is low, the energy consumption is high, and the energy conservation and environmental protection of the waste gas treatment are affected.
A method for treating exhaust gas by calcium cycle decarburization for purification of the exhaust gas, the method comprising the steps of:
s1, removing particulate matters and solid suspended matters by waste gas pretreatment;
s2, carrying out catalytic combustion treatment on the waste gas pretreated by the S1 to obtain high-temperature gas;
s3, performing calcium circulation decarburization treatment on the high-temperature gas to obtain clean gas;
the calcium circulation decarburization treatment method is operated as follows:
s31, providing spraying liquid and a spraying device;
the spraying liquid contains calcium ions and water;
s32, the spraying device extracts the spraying liquid and sprays the liquid along the spraying area to form a spraying water curtain;
s33, blowing the high-temperature gas into the spraying area, and reacting calcium ions with carbon dioxide in the high-temperature gas to decarbonize when a water curtain is sprayed;
s34, performing high-temperature treatment on the calcium carbonate generated by the decarburization reaction to enable the calcium carbonate to exist in the form of calcium ions;
s35, adding the calcium ions obtained by the high-temperature treatment into the spray liquid for recycling;
s4, collecting the heat evaporated during spraying as a standby heat source while S3 is performed;
and S5, directly discharging the clean gas after dehydration treatment.
According to the method, a calcium circulation decarburization mode is established to remove carbon dioxide in the waste gas, calcium ions and the carbon dioxide in the waste gas are subjected to chemical reaction to generate calcium carbonate and water while spraying and cooling are performed, the generated calcium carbonate exists in the form of calcium ions after pyrolysis, the reutilization is good, the waste gas purification treatment strength is improved, and meanwhile, the chemical decarburization mode is adopted, the treatment cost is reduced, the heating time of a catalytic combustion link is shortened, the working efficiency of the whole waste gas treatment process is improved, the energy consumption is reduced, and the energy conservation and environmental protection of waste gas treatment are enhanced.
In one embodiment, the exhaust gas is pre-treated in a filter chamber, and particulate matter and suspended matter in the exhaust gas is trapped and removed by physical adsorption.
In one embodiment, the method of catalytic combustion processing operates as follows:
s21 preheats the exhaust gas;
s22, the preheated waste gas enters a combustion chamber and is activated by a catalyst bed;
after S23 is activated, the waste gas is quickly oxidized to generate carbon dioxide and water.
Further, preheating the waste gas in a heat exchanger, and carrying out an activation step after preheating to 300-400 ℃.
In one embodiment, the preheated exhaust gas enters the combustion chamber, and when passing through the catalyst bed, the hydrocarbon molecules in the exhaust gas and the oxygen molecules in the mixed gas are respectively adsorbed on the surface of the catalyst to be activated.
In one embodiment, in S33, the calcium ions react with the carbon dioxide in the high-temperature gas to generate calcium carbonate and water;
in S34, the calcium carbonate undergoes decomposition reaction at high temperature to generate calcium oxide and carbon dioxide.
In one embodiment, the heat distilled off during spraying is recovered and transferred to S2 for use.
In one embodiment, the dehydration process is effected on the basis of physical adsorption;
wherein, the dehydration treatment adopts any one of sponge, active carbon and drying agent.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the carbon dioxide in the waste gas is removed by adopting a calcium circulation decarburization mode, calcium ions and the carbon dioxide in the waste gas are subjected to chemical reaction to generate calcium carbonate and water while spraying and cooling are carried out, and the generated calcium carbonate exists in the form of calcium ions after pyrolysis, so that the reutilization property is good, the waste gas purification treatment strength is improved, and meanwhile, the chemical decarburization mode is adopted, the absorption effect is good, the decarburization rate is high, and the treatment cost is reduced.
According to the invention, the heat evaporated during spraying is collected as a standby heat source, so that the heat evaporated during spraying in the decarburization treatment process can be effectively and fully utilized, the evaporated heat is sent to the preheating zone to heat the waste gas to be treated, the temperature of the waste gas is raised to the preheating temperature in an auxiliary manner, the temperature rise time of a catalytic combustion link is reduced, the working efficiency of the whole waste gas treatment process is improved, the energy consumption is reduced, and the energy conservation and environmental protection of the waste gas treatment method are enhanced.
In conclusion, the waste gas treatment method provided by the invention establishes a calcium circulation decarburization mode to remove carbon dioxide in waste gas, calcium ions and the carbon dioxide in the waste gas are subjected to chemical reaction to generate calcium carbonate and water while spraying and cooling, the generated calcium carbonate exists in the form of calcium ions after being subjected to pyrolysis, the reutilization is good, the waste gas purification treatment strength is improved, and meanwhile, the chemical decarburization mode is adopted, the treatment cost is reduced, the heating time of a catalytic combustion link is reduced, the working efficiency of the whole waste gas treatment process is improved, the energy consumption is reduced, and the energy conservation and environmental protection of the waste gas treatment method are enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Examples
A method for treating waste gas by calcium circulation decarburization is used for purifying the waste gas. The method comprises the following steps:
s1 flue gas pretreatment removes particulate matter and solid suspended matter.
The exhaust gas enters the filter chamber for pretreatment, and the embodiment adopts activated carbon material for pretreatment. When the exhaust gas passes through the activated carbon layer, particulate matter and suspended matter in the exhaust gas are trapped and removed based on physical adsorption.
S2, carrying out catalytic combustion treatment (catalytic combustion device) on the exhaust gas pretreated by the S1 to obtain high-temperature gas.
The method for catalytic combustion treatment is operated as follows:
s21 preheats the exhaust gas.
Preheating the waste gas in a heat exchanger, and performing an activation step after preheating to 300-400 ℃.
The preheated S22 waste gas enters the combustion chamber and is activated by the catalyst bed.
The preheated exhaust gas enters the combustion chamber, and when passing through the catalyst bed, hydrocarbon molecules in the exhaust gas and oxygen molecules in the mixed gas are respectively adsorbed on the surface of the catalyst to be activated.
After S23 is activated, the waste gas is quickly oxidized to generate carbon dioxide and water. The activation energy of the reaction is reduced by the surface adsorption, and at this time, hydrocarbons in the exhaust gas are rapidly oxidized with oxygen molecules to generate carbon dioxide and water.
In this embodiment, after the catalytic combustion process, the combustible harmful components such as organic matters, mercaptan, hydrogen sulfide and the like in the exhaust gas are purified and converted into harmless substances.
S3, performing calcium circulation decarburization treatment on the high-temperature gas to obtain clean gas.
The calcium circulation decarburization treatment method is operated as follows:
s31 provides a spray liquid and a spray device.
The spraying liquid contains calcium ions and water.
S32, the spraying device extracts the spraying liquid and sprays the liquid along the spraying area to form a spraying water curtain.
The spraying water curtain is used for cooling and further purifying the high-temperature gas obtained by catalytic combustion.
S33, the high-temperature gas is blown into the spraying area, and calcium ions react with carbon dioxide in the high-temperature gas to decarbonize when the high-temperature gas passes through the spraying water curtain.
S34, the calcium carbonate generated by the decarbonization reaction is subjected to high-temperature treatment, so that the calcium carbonate exists in the form of calcium ions.
The calcium carbonate and the carbon dioxide undergo a chemical reaction to produce calcium carbonate and water, thereby removing carbon from the exhaust gas.
S35, adding the calcium ions obtained by the high-temperature treatment into the spray liquid for recycling.
The calcium carbonate is subjected to decomposition reaction under a high-temperature condition, the decomposition products are water and calcium oxide, the calcium oxide has strong water absorbability and can be used as a drying agent, and the calcium oxide reacts with the water to form a spraying liquid for spraying and cooling based on the water absorbability of the calcium oxide.
In this embodiment, the carbon dioxide in the mode that adopts calcium circulation decarbonization comes the desorption waste gas, when spraying the cooling, carries out chemical reaction through the carbon dioxide in calcium ion and the waste gas and generates calcium carbonate and water to, the calcium carbonate that generates exists with the form of calcium ion again after pyrolysis, and reuse nature is good, when improving the waste gas purification treatment dynamics, adopts the mode that chemistry decarbonization was removed, and the absorption effect is good makes the decarbonization rate high and reduce the treatment cost.
S4 collects the heat evaporated during spraying as a backup heat source at the same time as S3.
Recovering the heat distilled off during spraying, and transmitting the heat distilled off to S2 for use.
In the embodiment, the heat evaporated during spraying is collected as the standby heat source, so that the heat evaporated during spraying in the decarburization treatment process can be effectively and fully utilized, the evaporated heat is sent to the preheating zone to heat the waste gas to be treated, the temperature of the waste gas is raised to the preheating temperature in an auxiliary manner, the temperature rise time of the catalytic combustion link is reduced, the work efficiency of the whole waste gas treatment process is improved, the energy consumption is reduced, and the energy conservation and environmental protection of the waste gas treatment method are enhanced. In other embodiments, the collected steaming-out heat can be used as a heat source for heating of a target such as a boiler according to the application environment.
And S5, directly discharging the clean gas after dehydration treatment.
The dehydration treatment is achieved based on physical adsorption. Wherein, the dehydration treatment adopts any one of sponge, active carbon and drying agent.
In summary, the method for treating exhaust gas of the present embodiment has the following advantages compared to the conventional exhaust gas treatment: according to the waste gas treatment method, the calcium circulation decarburization mode is established to remove carbon dioxide in waste gas, calcium carbonate and water are generated through chemical reaction of calcium ions and the carbon dioxide in the waste gas while spraying and cooling are carried out, the generated calcium carbonate exists in the form of calcium ions after pyrolysis, the recycling performance is good, the waste gas purification treatment strength is improved, meanwhile, the chemical decarburization mode is adopted, the treatment cost is reduced, the temperature rise time of a catalytic combustion link is reduced, the working efficiency of the whole waste gas treatment process is improved, the energy consumption is reduced, and the energy conservation and environmental protection performance of the waste gas treatment method are enhanced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The embodiments described above are more specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A method for treating exhaust gas by calcium cycle decarburization for purifying the exhaust gas, characterized by comprising the steps of:
s1, removing particulate matters and solid suspended matters by waste gas pretreatment;
s2, carrying out catalytic combustion treatment on the waste gas pretreated by the S1 to obtain high-temperature gas;
s3, carrying out calcium circulation decarburization treatment on the high-temperature gas to obtain clean gas;
the calcium circulation decarburization treatment method is operated as follows:
s31, providing spraying liquid and a spraying device;
the spraying liquid contains calcium ions and water;
s32, the spraying device extracts the spraying liquid and sprays the liquid along the spraying area to form a spraying water curtain;
s33, blowing the high-temperature gas into the spraying area, and reacting calcium ions with carbon dioxide in the high-temperature gas to decarbonize when a water curtain is sprayed;
s34, performing high-temperature treatment on the calcium carbonate generated by the decarburization reaction to enable the calcium carbonate to exist in the form of calcium ions;
s35, adding the calcium ions obtained by the high-temperature treatment into the spray liquid for recycling;
s4, collecting the heat evaporated during spraying as a standby heat source while S3 is performed;
and S5, directly discharging the clean gas after dehydration treatment.
2. A method of decarbonising exhaust gases using calcium cycles according to claim 1, characterized in that the exhaust gases are fed to a filter chamber for pretreatment, whereby the particulate matter and suspended matter in the exhaust gases are retained and removed by physical adsorption.
3. The method for decarbonizing and treating exhaust gas by calcium cycle according to claim 1, wherein the method for catalytic combustion treatment is operated as follows:
s21 preheats the exhaust gas;
s22, the preheated waste gas enters a combustion chamber and is activated by a catalyst bed;
after S23 is activated, the waste gas is quickly oxidized to generate carbon dioxide and water.
4. The method for decarbonizing with calcium cycle according to claim 3 is characterized in that the exhaust gas is preheated in a heat exchanger, and the exhaust gas is preheated to 300-400 ℃ before being subjected to the activation step.
5. The method of claim 3, wherein the preheated exhaust gas is introduced into the combustion chamber, and hydrocarbon molecules in the exhaust gas and oxygen molecules in the mixed gas are adsorbed on the surface of the catalyst to be activated, respectively, while passing through the catalyst bed.
6. The method for decarbonizing with calcium cycle according to claim 1, wherein in S33, the calcium ions react with the carbon dioxide in the high temperature gas to generate calcium carbonate and water;
in S34, the calcium carbonate undergoes decomposition reaction at high temperature to generate calcium oxide and carbon dioxide.
7. The method for decarbonizing exhaust gas by calcium cycle according to claim 1, wherein the heat distilled off during spraying is recovered and transferred to S2 for use.
8. The method for decarbonizing with calcium cycle according to claim 1 is characterized in that the dehydration treatment is performed based on physical adsorption;
wherein, the dehydration treatment adopts any one of sponge, active carbon and drying agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210409286.3A CN114669176A (en) | 2022-04-19 | 2022-04-19 | Method for treating waste gas by calcium circulation decarburization |
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| CN202210409286.3A CN114669176A (en) | 2022-04-19 | 2022-04-19 | Method for treating waste gas by calcium circulation decarburization |
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| CN112624634A (en) * | 2020-12-16 | 2021-04-09 | 张照鹏 | Desulfurization and decarburization system and desulfurization and decarburization method |
| CN113731134A (en) * | 2021-09-29 | 2021-12-03 | 大连海事大学 | Shipborne carbon dioxide capturing and sealing device and method |
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2022
- 2022-04-19 CN CN202210409286.3A patent/CN114669176A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205979816U (en) * | 2016-08-28 | 2017-02-22 | 宜兴市荣茂化工有限公司 | Catalytic combustor |
| CN106782734A (en) * | 2017-01-23 | 2017-05-31 | 青岛天和清原科技有限公司 | A kind of middle cool waste processing method |
| WO2021004730A1 (en) * | 2019-07-05 | 2021-01-14 | Ctp Chemisch Thermische Prozesstechnik Gmbh | Method and system for cleaning exhaust gases charged with organic contaminants |
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| CN113731134A (en) * | 2021-09-29 | 2021-12-03 | 大连海事大学 | Shipborne carbon dioxide capturing and sealing device and method |
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