CN105032123A - Middle-low temperature regenerated carbon dioxide capturing absorbent and application method thereof - Google Patents
Middle-low temperature regenerated carbon dioxide capturing absorbent and application method thereof Download PDFInfo
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- CN105032123A CN105032123A CN201510377568.XA CN201510377568A CN105032123A CN 105032123 A CN105032123 A CN 105032123A CN 201510377568 A CN201510377568 A CN 201510377568A CN 105032123 A CN105032123 A CN 105032123A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- 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
Abstract
A middle-low temperature regenerated carbon dioxide capturing absorbent is composed of the following components in percentage by weight: 10 to 80% of low temperature regenerated amine, 5 to 25% of pH adjuster, 0 to 10% of auxiliary agent, and the balance being water. When the absorbent is used, low temperature regenerated carbon dioxide absorbent in an absorbing tower reacts with gas containing carbon dioxide to form a rich liquor, the absorbing temperature is 30 to 50 DEG C, and the absorbing tower pressure is 0.05 to 6 MPa. The rich liquor is preheated in a barren liquor/rich liquor heat exchanger to flash-evaporate part of carbon dioxide gas, after flash evaporation the rich liquor is transferred to a regeneration tower to carry out low temperature pyrolysis, the rich liquor is converted into barren liquor, at the same time carbon dioxide is generated; the temperature of the bottom of the regeneration tower is 70 to 100 DEG C, the generated hot barren liquor in the regeneration tower is conveyed to the absorbing tower for capturing carbon dioxide after going through the heat exchanger, and thus the whole absorption-regeneration-absorption circle is completed. The provided absorbent can be regenerated at a low temperature, and thus the capturing cost can be reduced in multiple aspects.
Description
Technical field
The present invention relates to GAS ABSORPTION and separation engineering technical field, be specifically related to low-temp recovery collecting carbonic anhydride absorbent and using method thereof in one.
Background technology
At present, in industrial large-sized CO2 emission source, in the emission source of particularly middle low concentration, capturing carbon dioxide generally selects chemical absorption method, absorbent take monoethanolamine as representative, in absorption tower, form compound with sour gas carbon dioxide reaction, make it separate from gas phase to enter rich solution to leave absorption tower.Heat rich solution in regenerator, the compound that carbon dioxide and hydramine are formed is heated to occur to decompose release of carbon dioxide and realize hydramine and regenerates.The subject matter of this kind of absorbent is that the energy consumption trapped is higher, and regeneration temperature is 110-120 DEG C, needs to consume a large amount of saturated vapors, and this is also one of main reason that this kind of carbon trapping technique cost is high.
For monoethanolamine, in trapping technique, regeneration energy consumption accounts for more than 60% of total energy consumption, and the heat in regeneration energy consumption needed for compound pyrolysis accounts for 50%, and rich solution is warmed up to the adjoint sensible heat of regeneration temperature and latent heat respectively accounts for about 25%.If the absorbent adopted and carbon dioxide can regenerate at 95 DEG C, just be enough to the ability again recovering absorbent capturing carbon dioxide, calculating shows like this under the condition that concentration of absorbing is consistent with rich or poor liquid load, whole trapping circulation can save the sensible heat of nearly 50% and the latent heat of more than 80%, meanwhile, the absorbent that regeneration temperature is low and the general chemical regenerated heat of the compound that carbon dioxide is formed also lower.Under such equal conditions, the trapping energy consumption of carbon dioxide entirety is estimated reduction by more than 25%.But, if absorbent is to the binding ability of carbon dioxide is not strong or reaction speed is low, so the capture rate on absorption tower is just more difficult reaches, in rich solution, the load of carbon dioxide does not reach expection, also may affect the efficiency of trapping technique, in therefore adopting, the carbon-dioxide absorbent of low-temp recovery also rarely has feasible discovery.
Summary of the invention
In order to overcome the shortcoming that prior art exists, the object of the present invention is to provide a kind of carbon-dioxide absorbent that can regenerate under middle cryogenic conditions, absorbent has the features such as regeneration energy consumption is low, circulation volume is large.
In order to achieve the above object, the present invention is by the following technical solutions:
Low-temp recovery collecting carbonic anhydride absorbent in one, each component by mass percentage is:
Low-temp recovery amine: 10 ~ 80%
PH adjusting agent: 5 ~ 25%
Auxiliary agent: 0 ~ 10%
Water: surplus.
Wherein, described low-temp recovery amine is organic amine, and be a class material, its structural formula is:
In structural formula, R1, R2, R6, R8 are linear paraffin, R3, R4, R5, R7, R9, R10 are hydrogen atom, linear paraffin base, branched alkane alkyl or alkoxyl, R5, R6 be straight chained alkyl or, specifically comprise 2-(tert-butylamine base) ethanol, 2-(2,2 dimethyl propylene amido) ethanol, 3-(Zhong Ding is amino) propyl alcohol etc.
Described pH adjusting agent is potash, sodium carbonate, potassium hydroxide, NaOH, saleratus or sodium acid carbonate.
Described auxiliary agent is one or more defoamers, antioxidant or corrosion inhibiter, and defoamer is organosiloxane, acid amides or fatty alcohol; Antioxidant is potassium tartrate, sodium tartrate, potassium antimony tartrate or sodium thiosulfate; Corrosion inhibiter is chromate, nitrate or molybdate.
A using method for middle low-temp recovery collecting carbonic anhydride absorbent, concrete steps are:
In absorption tower, the carbon-dioxide absorbent of low-temp recovery forms rich solution with the gas reaction containing carbon dioxide, absorb temperature: 30 ~ 50 DEG C, absorption tower pressure: 0.05 ~ 6Mpa, rich solution carries out preheating through poor rich liquid heat exchanger, flash off a part of carbon dioxide, rich solution after flash distillation enters regenerator and carries out low temperature pyrogenation, regeneration becomes lean solution and output carbon dioxide, regenerator bottom temp 70-100 DEG C, the hot lean solution that regenerator produces is sent to absorption tower for collecting carbonic anhydride through heat exchanger, completes whole absorption-regeneration-absorption cycle.
Described carbonated source of the gas comprises the industrial gasses of flue gas, synthesis gas or natural gas.
Compared with prior art, the present invention has the following advantages:
Because absorbent can regenerate at a lower temperature, therefore the low-grade steam of use more than can trying one's best or even the used heat of 80 degrees centigrade, and regeneration temperature is below the boiling point of water, temperature elevating range reduces greatly, the latent heat of regenerative process and sensible heat consumption reduce, and therefore can greatly reduce the energy consumption of collecting carbonic anhydride, in addition because operating temperature is low, energy consumption and the corrosion of trapping system also reduce greatly, thus can cut down trapping cost in many-side.
Detailed description of the invention
Below in conjunction with example, the present invention is described in detail.
Embodiment one
A carbon-dioxide absorbent for low-temp recovery, each component is designated as by mass percentage: low-temp recovery amine: 25.00%; PH adjusting agent: 5.00%; Auxiliary agent: 0.03%; Water: surplus.Low-temp recovery amine is 2-(tert-butylamine base) ethanol, and pH adjusting agent is potash, and auxiliary agent is organosiloxane defoamer.
Its using method is: the carbon-dioxide absorbent of the low-temp recovery in absorption tower forms rich solution with the gas reaction containing carbon dioxide, absorb temperature: 40 DEG C, absorption pressure: 0.1Mpa, the amount of absorbed carbon dioxide material is more than 0.40 with the ratio of low-temp recovery amine amount of substance, rich solution carries out preheating through poor rich liquid heat exchanger, flash off a part of carbon dioxide, rich solution after flash distillation enters regenerator and carries out low temperature pyrogenation, regeneration forms lean solution and output carbon dioxide, regenerator bottom temp 90 DEG C, the hot lean solution that regenerator produces is sent to absorption tower for collecting carbonic anhydride through heat exchanger, complete whole absorption-regeneration-absorption cycle.
Embodiment two
A carbon-dioxide absorbent for low-temp recovery, each component is designated as by mass percentage: low-temp recovery amine: 25.00%; PH adjusting agent: 5.00%; Auxiliary agent: 0.02%; Water: surplus.Low-temp recovery amine is 3-(Zhong Ding is amino) propyl alcohol, and pH adjusting agent is potassium hydroxide, and auxiliary agent is organosiloxane defoamer.
Its using method is: the carbon-dioxide absorbent of the low-temp recovery in absorption tower with form rich solution with the gas reaction containing carbon dioxide, absorb temperature: 40 DEG C, absorption pressure: 0.1Mpa, the amount of absorbed carbon dioxide material is more than 0.35 with the ratio of low-temp recovery amine amount of substance, rich solution carries out preheating through poor rich liquid heat exchanger, flash off a part of carbon dioxide, rich solution after flash distillation enters regenerator and carries out low temperature pyrogenation, regeneration becomes lean solution and output carbon dioxide, regenerator bottom temp 85 DEG C, the hot lean solution that regenerator produces is sent to absorption tower for collecting carbonic anhydride through heat exchanger, complete whole absorption-regeneration-absorption cycle.
Embodiment three
A carbon-dioxide absorbent for low-temp recovery, each component is designated as by mass percentage: low-temp recovery amine: 25.00%; PH adjusting agent: 5.00%; Auxiliary agent: 0.02%; Water: surplus.Low-temp recovery amine is 2-(2,2 dimethyl propylene amido) ethanol, and pH adjusting agent is sodium acid carbonate, and auxiliary agent is organosiloxane defoamer.
Its using method is: in absorption tower, absorbent solution forms rich solution with the gas reaction containing carbon dioxide, absorb temperature: 35 DEG C, absorption pressure: 1Mpa, the amount of absorbed carbon dioxide material is more than 0.45 with the ratio of low-temp recovery amine amount of substance, rich solution carries out preheating through poor rich liquid heat exchanger, flash off a part of carbon dioxide, rich solution after flash distillation enters regenerator and carries out low temperature pyrogenation, regeneration becomes lean solution and output carbon dioxide, regenerator bottom temp 90 DEG C, the hot lean solution that regenerator produces is sent to absorption tower for collecting carbonic anhydride through heat exchanger, complete whole absorption-regeneration-absorption cycle.
Claims (2)
1. in, a low-temp recovery collecting carbonic anhydride absorbent, is characterized in that, each component by mass percentage is:
Low-temp recovery amine: 10 ~ 80%
PH adjusting agent: 5 ~ 25%
Auxiliary agent: 0 ~ 10%
Water: surplus;
Wherein, described low-temp recovery amine is organic amine, and be a class material, its structural formula is:
In structural formula, R1, R2, R6, R8 are linear paraffin, R3, R4, R5, R7, R9, R10 are hydrogen atom, linear paraffin base, branched alkane alkyl or alkoxyl, R5, R6 be straight chained alkyl or, specifically comprise 2-(tert-butylamine base) ethanol, 2-(2,2 dimethyl propylene amido) ethanol, 3-(Zhong Ding is amino) propyl alcohol.
Described pH adjusting agent is potash, sodium carbonate, potassium hydroxide, NaOH, saleratus or sodium acid carbonate.
Described auxiliary agent is one or more defoamers, antioxidant or corrosion inhibiter, and defoamer is organosiloxane, acid amides or fatty alcohol; Antioxidant is potassium tartrate, sodium tartrate, potassium antimony tartrate or sodium thiosulfate; Corrosion inhibiter is chromate, nitrate or molybdate.
2., based on the using method of a kind of middle low-temp recovery collecting carbonic anhydride absorbent according to claim 1, it is characterized in that, concrete steps are:
In absorption tower, the carbon-dioxide absorbent of low-temp recovery forms rich solution with the gas reaction containing carbon dioxide, absorb temperature: 30 ~ 50 DEG C, absorption tower pressure: 0.05 ~ 6Mpa, rich solution carries out preheating through poor rich liquid heat exchanger, flash off a part of carbon dioxide, rich solution after flash distillation enters regenerator and carries out low temperature pyrogenation, regeneration becomes lean solution and output carbon dioxide, regenerator bottom temp 70-100 DEG C, the hot lean solution that regenerator produces is sent to absorption tower for collecting carbonic anhydride through heat exchanger, completes whole absorption-regeneration-absorption cycle;
Described carbonated source of the gas comprises the industrial gasses of flue gas, synthesis gas or natural gas.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012089A (en) * | 2018-06-28 | 2018-12-18 | 北京科技大学 | A method of carbon dioxide is trapped using potassium hydroxide and potassium carbonate |
| CN109012110A (en) * | 2018-06-28 | 2018-12-18 | 北京科技大学 | A method of carbon dioxide is trapped using sodium hydroxide and sodium carbonate |
| CN110052117A (en) * | 2019-05-08 | 2019-07-26 | 华能国际电力股份有限公司 | It is a kind of for the liquid-liquid decomposition absorbent of collecting carbonic anhydride and application |
| CN113318572A (en) * | 2021-05-27 | 2021-08-31 | 华侨大学 | Carbon dioxide phase change absorbent organic alcohol regeneration regulation and control method and application thereof |
| CN114669177A (en) * | 2022-03-09 | 2022-06-28 | 中国矿业大学 | Low-energy-consumption CO2Trapping and compression refining process |
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| CN113318572B (en) * | 2021-05-27 | 2022-06-07 | 华侨大学 | Carbon dioxide phase change absorbent organic alcohol regeneration regulation and control method and application thereof |
| CN114669177A (en) * | 2022-03-09 | 2022-06-28 | 中国矿业大学 | Low-energy-consumption CO2Trapping and compression refining process |
| CN114669177B (en) * | 2022-03-09 | 2024-01-26 | 中国矿业大学 | Low-energy-consumption CO 2 Trapping and compression refining process |
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| CN105032123B (en) | 2018-07-06 |
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