CN102784546A - Efficient CO2 capture system - Google Patents

Efficient CO2 capture system Download PDF

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Publication number
CN102784546A
CN102784546A CN2012102754771A CN201210275477A CN102784546A CN 102784546 A CN102784546 A CN 102784546A CN 2012102754771 A CN2012102754771 A CN 2012102754771A CN 201210275477 A CN201210275477 A CN 201210275477A CN 102784546 A CN102784546 A CN 102784546A
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China
Prior art keywords
solution
lean solution
absorption tower
normal pressure
liquid
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CN2012102754771A
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Chinese (zh)
Inventor
许世森
程健
徐越
王保民
任永强
夏军仓
李晨
张瑞云
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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Priority to CN2012102754771A priority Critical patent/CN102784546A/en
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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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry

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Abstract

The invention relates to an efficient CO2 capture system, which comprises a two-stage absorption tower formed by vertically connecting a lower half-lean solution stage and an upper lean solution stage, wherein a CO2 gas containing inlet is positioned below the half-lean solution stage of the two-stage absorption tower, and a rich solution outlet at the bottom of the two-stage absorption tower is connected with an inlet at the top of an atmospheric pressure desorption tower; a solution outlet at the bottom of the atmospheric pressure desorption tower is connected with a solution inlet at the upper part of the half-lean solution stage of the two-stage absorption tower and is also connected with a solution inlet at the top of a regeneration tower, and a solution outlet at the bottom of the regeneration tower is connected with a solution inlet at the upper part of the lean solution stage of the two-stage absorption tower; an air outlet at the top of the regeneration tower is connected with the atmospheric pressure desorption tower, and an air outlet at the top of the atmospheric pressure desorption tower is connected to a CO2 purification and compression liquefaction system and an air outlet at the top of the two-stage absorption tower is connected with a crude hydrogen recovery system. According to the efficient CO2 capture system provided by the invention, the CO2 capture rate is improved by a half-lean solution-lean solution method, the CO2 recovery rate is improved by combining atmospheric pressure desorption with solution regeneration desorption, and the low-carbon emission of a clean coal power generation system is realized.

Description

A kind of CO efficiently 2Trapping system
Technical field
The invention belongs to the clean coal power generation technical field, relate to a kind of CO efficiently 2Trapping system.
Background technology
The global environment problem that with the climate change is core is serious day by day, has become one of principal element that threatens human kind sustainable development, and cutting down greenhouse gas emission becomes the focus that current international community is paid close attention to slow down climate change.In numerous reduction of greenhouse gas discharge schemes, carbon captures and the technology of sealing up for safekeeping is emerging, as to have an extensive reduction of discharging potentiality technology, is expected to the CO that realizes that fossil energy is used 2Low-carbon emission.
CO 2The capture process is under certain pressure, to pass through physical and chemical process with CO through various absorption liquids 2Absorb, the method for passing through heating then is with CO 2Desorb, further process according to subsequent request.Therefore, CO 2Capture be a process that consumes steam electricity equal energy source, no matter be before the burning or burning back CO 2Trapping system, the effective ways that reduce system energy consumption are to increase absorption liquid to CO as far as possible 2Absorption, improve the CO of system 2Capture rate reduces the consumption of public works such as steam, so just can reduce to capture CO per ton 2Energy consumption, reach purpose of energy saving.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art, the object of the present invention is to provide a kind of CO efficiently 2Trapping system, the CO of this system 2Capture rate is high, and energy consumption is low, can realize the low-carbon emission of clean coal power generation system.
To achieve these goals, the technical scheme of the present invention's employing is:
A kind of CO efficiently 2Trapping system comprises by two sections vertical two-part absorption towers 1 that are composed in series of bottom semi lean solution section and top lean solution section, contains CO 2The gas access is positioned at the semi lean solution section below on two-part absorption tower 1; The 1 rich bottoms liquid outlet of two-part absorption tower connects the top inlet of normal pressure desorber 5; Normal pressure desorber 5 bottom liquid outlets connect two-part absorption tower 1 semi lean solution section top liquid inlet; Normal pressure desorber 5 bottom liquid outlets also connect regenerator 12 top liquid inlets, and regenerator 12 is connected to reboiler 13, and the bottom liquid outlet of regenerator 12 connects the liquid inlet of 1 lean solution section top, two-part absorption tower; The gas outlet, top of regenerator 12 connects normal pressure desorber 5, and the gas outlet, top of normal pressure desorber 5 is connected to CO 2Purify and compress and liquefy system, the gas outlet, top on two-part absorption tower 1 connects thick hydrogen recovery system.
The gas outlet, top on said two-part absorption tower 1 is connected to decarbonization gas cooler 2 and decarburization knockout 3 successively, and the gas outlet, top of normal pressure desorber 5 is connected to CO successively 2 Gas cooler 6 and CO 2Gas knockout 7, decarburization knockout 3 and CO 2The liquid that gas knockout 7 is discharged is all delivered to bottom solution groove 16, delivers to normal pressure desorber 5 top liquid inlets by solution pump 15 again.
On the passage between the top inlet of 1 rich bottoms liquid outlet of said two-part absorption tower and normal pressure desorber 5 poor rich liquid heat exchanger 4 is set; Passage between the liquid inlet of the bottom liquid outlet of regenerator 12 and two-part absorption tower 1 lean solution section top also passes through poor rich liquid heat exchanger 4, realizes the exchange heat of lean solution and rich solution.
Lean solution in the said two-part absorption tower 1 is identical with solution in the liquid storage tank 17, is the MDEA solution of mass concentration 40%, and semi lean solution is to absorb CO 2And H 2The solution of the MDEA of the rich solution of S after the part sour gas is emitted in the normal pressure flash distillation can also add the activator such as the R of mass fraction 1 ~ 5% in the said lean solution 2NH.
The invention has the beneficial effects as follows:
1. the absorption tower of adopting two-part to arrange, the absorption liquid semi lean solution through semi lean solution section 70～80% is with the most of CO in the gas 2Absorb, utilize 20～30% the thorough remaining CO of absorption of lean solution then 2, reach CO 2High-absorbility.This layout can reduce the consumption of absorption liquid, reduces operating cost.
2. adopt normal pressure desorb and the method that solution regeneration desorb combines, improve CO 2The rate of recovery reduce steam consumption, and this method can make the equipment size of regenerator reduce greatly.
3. adopt system provided by the invention can use the CO that the monoethanolamine absorption liquid absorbs coal fired power plant or natural gas circulating power station flue gas 2, can use N methyldiethanol amine (MDEA) or NHD solution (NHD) and absorb the CO that produces after the conversion of carbon-containing fuel steam 2
Description of drawings
Accompanying drawing is a trapping system sketch map of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.
Shown in accompanying drawing, system of the present invention comprises: two-part absorption tower 1, decarbonization gas cooler 2, decarburization knockout 3, poor rich liquid heat exchanger 4, normal pressure desorber 5, CO 2Gas cooler 6, CO 2Gas knockout 7, semi-leanpump 8, normal pressure pump 9, the first heat exchangers 10, semi lean solution filter 11, regenerator 12, reboiler 13, lean solution filter 14 holds liquid pump 15, solution geosyncline 16, solution storage trough 17, lean pump 18, the second heat exchangers 19.
Wherein two-part absorption tower 1 vertically is composed in series by two sections absorption towers, and the bottom is the semi lean solution section, and top is the lean solution section.Lean solution is the MDEA solution of mass concentration 40%, wherein is added with the activator R of mass fraction 1 ~ 5% 2NH, semi lean solution absorb CO 2And H 2The solution of the MDEA of the rich solution of S after the part sour gas is emitted in the normal pressure flash distillation.The lean solution section absorbs liquid measure and accounts for 20～30% of absorption liquid total amount, and semi lean solution section absorption liquid accounts for 70～80% of absorption liquid total amount, and this structure can reduce the consumption of solution.Contain CO 2The gas access is positioned at the semi lean solution section below on two-part absorption tower 1, contains CO 2Gas gets into the semi lean solution section from this inlet, and motion from bottom to top afterwards forms counter current contacting with semi lean solution earlier, the mass-and heat-transfer reaction takes place, most CO on the surface of filler 2Be absorbed at this, gas continues upwards to get into the lean solution absorber portion, under the lean solution effect, and residue CO 2The overwhelming majority is absorbed.The gas outlet, top on two-part absorption tower 1 connects thick hydrogen recovery system through decarbonization gas cooler 2 and decarburization knockout 3 successively, and the gas that goes out two-part absorption tower 1 is delivered to out-of-bounds behind decarbonization gas cooler 2, decarburization knockout 3 and further handled according to subsequent request.
The 1 rich bottoms liquid outlet of two-part absorption tower connects the top inlet of normal pressure desorber 5; Normal pressure desorber 5 bottom liquid outlets connect two-part absorption tower 1 semi lean solution section top liquid inlet; Normal pressure desorber 5 bottom liquid outlets also connect regenerator 12 top liquid inlets, and the bottom liquid outlet of regenerator 12 connects the liquid inlet of 1 lean solution section top, two-part absorption tower.Wherein on the passage between the top inlet of outlet of two-part absorption tower 1 rich bottoms liquid and normal pressure desorber 5 poor rich liquid heat exchanger 4 is set; Passage between the liquid inlet of the bottom liquid outlet of regenerator 12 and two-part absorption tower 1 lean solution section top also passes through poor rich liquid heat exchanger 4, realizes the exchange heat of lean solution and rich solution.
The rich solution that 1 rich bottoms liquid exports out from the two-part absorption tower generally also needs to reduce to 0.3Mpa through pressure-reducing valve; Through the lean solution of being discharged from regenerator 12 bottom liquid outlets is carried out rich or poor liquid exchange heat in poor rich liquid heat exchanger after; Get into normal pressure desorber 5 again, the physical absorption properties of utilizing solution therein is with most CO 2Desorb; Solution flows downward and becomes semi lean solution; And come out to be divided into two parts from normal pressure desorber 5 bottom liquid outlets: most semi lean solution directly through semi-leanpump 8 superchargings deliver to the semi lean solution section top on two-part absorption tower 1; Remainder is boosted by normal pressure pump 9 and by in semi lean solution filter 11, filtering after 10 heat exchange of first heat exchanger, filter the back from the top of regenerator 12 liquid inlet deliver in the regenerator 12.
Regenerator 12 is connected to reboiler 13, and the gas outlet, top of regenerator 12 connects normal pressure desorber 5.In regenerator 12, solution flows from top to bottom, contacts with the water vapour of reboiler 13, makes remaining CO in the solution 2All desorb, reach the purpose of thorough regeneration, the lean solution that goes out regenerator 12 bottoms successively by poor rich liquid heat exchanger 4 carry out that heat exchange, lean pump 18 are pressurizeed, second heat exchanger 19 carry out water-cooled but after, deliver to the lean solution section top on two-part absorption tower 1.
The gas outlet, top of normal pressure desorber 5 is passed through CO successively 2 Gas cooler 6 and CO 2Gas knockout 7 meets CO 2Purify and compress and liquefy system, the gas that goes out normal pressure desorber 5 tops is at CO 2Carry out in the gas cooler 6 water-cooled but, at CO 2After carrying out separatory in the gas knockout 7, obtain the CO of high concentration 2Gas also is sent to CO 2Purify and compress and liquefy system.
Above-mentioned decarburization knockout 3 and CO 2The liquid that gas knockout 7 is discharged is all delivered to bottom solution groove 16; Through solution pump 15 liquid, lean solution filter 14 is fed through normal pressure desorber 5 by normal pressure desorber 5 top liquid inlets after filtering again; To keep systematic water balance; The moisture of system loss is replenished by the desalted water that out-of-bounds comes, and can on lean solution filter 14 paths, connect solution storage trough 17 to carry out the adjusting of solution concentration, and the solution in the liquid storage tank 17 is the lean solution in the two-part absorption tower 1.
Through above step, utilize lean solution-semi lean solution absorption process CO 2Removal efficiency can reach more than 99% and CO 2Desorption process adopt normal pressure desorb and solution to regenerate method that desorb combines, improved CO 2The rate of recovery has reduced steam consumption.The present invention utilizes lean solution-semi lean solution to absorb raising CO 2The method of capture rate both can be used for coal fired power plant, natural gas circulating power station flue gas CO 2Capture, also can be applicable to CO before the burning of the coal gas synthesis gas that the integrated gasification combined cycle plants system produces 2Capture.Also can use the CO that the monoethanolamine absorption liquid absorbs coal fired power plant or natural gas circulating power station flue gas 2Capture, and the CO that produces after N methyldiethanol amine (MDEA) or the conversion of NHD solution (NHD) absorption carbon-containing fuel steam 2Capture.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (6)

1. CO efficiently 2Trapping system is characterized in that, comprises by two sections vertical two-part absorption towers (1) that are composed in series of bottom semi lean solution section and top lean solution section, contains CO 2The gas access is positioned at the semi lean solution section below on two-part absorption tower (1); Two-part absorption tower (1) rich bottoms liquid outlet connects the top inlet of normal pressure desorber (5); Normal pressure desorber (5) bottom liquid outlet connects semi lean solution section top, two-part absorption tower (1) liquid inlet; Normal pressure desorber (5) bottom liquid outlet also connects regenerator (12) top liquid inlet, and regenerator (12) is connected to reboiler (13), and the bottom liquid outlet of regenerator (12) connects the liquid inlet of lean solution section top, two-part absorption tower (1); The gas outlet, top of regenerator (12) connects normal pressure desorber (5), and the gas outlet, top of normal pressure desorber (5) is connected to CO 2Purify and compress and liquefy system, the gas outlet, top of two-part absorption tower (1) connects thick hydrogen recovery system.
2. according to the said CO efficiently of claim 1 2Trapping system is characterized in that, the gas outlet, top on said two-part absorption tower (1) is connected to decarbonization gas cooler (2) and decarburization knockout (3) successively, and the gas outlet, top of normal pressure desorber (5) is connected to CO successively 2Gas cooler (6) and CO 2Gas knockout (7), decarburization knockout (3) and CO 2The liquid that gas knockout (7) is discharged is all delivered to bottom solution groove (16), delivers to normal pressure desorber (5) top liquid inlet by solution pump (15) again.
3. according to the said CO efficiently of claim 1 2Trapping system; It is characterized in that; On the passage between the top inlet of said two-part absorption tower (1) rich bottoms liquid outlet and normal pressure desorber (5) poor rich liquid heat exchanger (4) is set; Passage between the liquid inlet of the bottom liquid outlet of regenerator (12) and two-part absorption tower (1) lean solution section top also passes through poor rich liquid heat exchanger (4), realizes the exchange heat of lean solution and rich solution.
4. according to the said raising of claim 1 CO 2The device of capture rate is characterized in that, the lean solution in the said two-part absorption tower (1) is identical with solution in the liquid storage tank (17), is the MDEA solution of mass concentration 40%, and semi lean solution is to absorb CO 2And H 2The solution of the MDEA of the rich solution of S after the part sour gas is emitted in the normal pressure flash distillation.
5. according to the said raising of claim 4 CO 2The device of capture rate is characterized in that, adds the activator that mass fraction 1 ~ 5% is arranged in the said lean solution.
6. according to the said raising of claim 5 CO 2The device of capture rate is characterized in that, said activator is R 2NH.
CN2012102754771A 2012-08-03 2012-08-03 Efficient CO2 capture system Pending CN102784546A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103961979A (en) * 2014-04-28 2014-08-06 中国华能集团清洁能源技术研究院有限公司 Multistage division regenerative carbon dioxide trapping system and technology
CN104357096A (en) * 2014-10-16 2015-02-18 天津奥展兴达化工技术有限公司 Efficient energy-saving gas purifying treatment method
CN104815529A (en) * 2015-04-21 2015-08-05 中国华能集团清洁能源技术研究院有限公司 Carbon dioxide capture regeneration system
WO2017064541A1 (en) 2015-10-16 2017-04-20 Cseh Peter Thermal power station with reduced emission and procedure for its use
CN109999618A (en) * 2019-04-25 2019-07-12 华能国际电力股份有限公司 The separation system and method for carbon dioxide in a kind of mesohigh gas source
CN113041799A (en) * 2021-03-12 2021-06-29 中国华能集团清洁能源技术研究院有限公司 IGCC-based pre-combustion CO2Pressure energy recovery device of trapping system
CN113499669A (en) * 2021-08-02 2021-10-15 高维平 Efficient composite low-temperature methanol-washing CO2Recovery tower
CN114225623A (en) * 2022-02-25 2022-03-25 中国华能集团清洁能源技术研究院有限公司 Carbon capture system
CN114917726A (en) * 2022-03-16 2022-08-19 新疆敦华绿碳技术股份有限公司 CO (carbon monoxide) 2 Trapping device
CN115634566A (en) * 2022-10-28 2023-01-24 大连理工大学 MDEA semi-lean cycle desulfurization device and method using low-temperature heat

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CN1197763A (en) * 1998-04-10 1998-11-04 刘金成 Carbon dioxide eliminating technology used in ammonia synthesis and hydrogen production processes
CN101637694A (en) * 2009-05-08 2010-02-03 北京化工大学 Method for separating and recycling CO2 from mixed gas containing CO2
CN201578973U (en) * 2009-12-14 2010-09-15 华能集团技术创新中心 Flue gas carbon dioxide capturing equipment and absorption tower thereof
CN202803072U (en) * 2012-08-03 2013-03-20 中国华能集团清洁能源技术研究院有限公司 Efficient CO2 gathering device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1197763A (en) * 1998-04-10 1998-11-04 刘金成 Carbon dioxide eliminating technology used in ammonia synthesis and hydrogen production processes
CN101637694A (en) * 2009-05-08 2010-02-03 北京化工大学 Method for separating and recycling CO2 from mixed gas containing CO2
CN201578973U (en) * 2009-12-14 2010-09-15 华能集团技术创新中心 Flue gas carbon dioxide capturing equipment and absorption tower thereof
CN202803072U (en) * 2012-08-03 2013-03-20 中国华能集团清洁能源技术研究院有限公司 Efficient CO2 gathering device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103961979A (en) * 2014-04-28 2014-08-06 中国华能集团清洁能源技术研究院有限公司 Multistage division regenerative carbon dioxide trapping system and technology
CN104357096A (en) * 2014-10-16 2015-02-18 天津奥展兴达化工技术有限公司 Efficient energy-saving gas purifying treatment method
CN104815529A (en) * 2015-04-21 2015-08-05 中国华能集团清洁能源技术研究院有限公司 Carbon dioxide capture regeneration system
WO2017064541A1 (en) 2015-10-16 2017-04-20 Cseh Peter Thermal power station with reduced emission and procedure for its use
CN109999618A (en) * 2019-04-25 2019-07-12 华能国际电力股份有限公司 The separation system and method for carbon dioxide in a kind of mesohigh gas source
CN109999618B (en) * 2019-04-25 2024-05-14 华能国际电力股份有限公司 System and method for separating carbon dioxide from medium-high pressure gas source
CN113041799A (en) * 2021-03-12 2021-06-29 中国华能集团清洁能源技术研究院有限公司 IGCC-based pre-combustion CO2Pressure energy recovery device of trapping system
CN113499669A (en) * 2021-08-02 2021-10-15 高维平 Efficient composite low-temperature methanol-washing CO2Recovery tower
CN113499669B (en) * 2021-08-02 2024-01-19 高维平 High-efficiency composite low-temperature methanol washing CO 2 Recovery tower
CN114225623A (en) * 2022-02-25 2022-03-25 中国华能集团清洁能源技术研究院有限公司 Carbon capture system
CN114917726A (en) * 2022-03-16 2022-08-19 新疆敦华绿碳技术股份有限公司 CO (carbon monoxide) 2 Trapping device
CN115634566A (en) * 2022-10-28 2023-01-24 大连理工大学 MDEA semi-lean cycle desulfurization device and method using low-temperature heat

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Application publication date: 20121121