CN104607016A - Thermal power plant carbon dioxide recovery method - Google Patents
Thermal power plant carbon dioxide recovery method Download PDFInfo
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- CN104607016A CN104607016A CN201310535502.XA CN201310535502A CN104607016A CN 104607016 A CN104607016 A CN 104607016A CN 201310535502 A CN201310535502 A CN 201310535502A CN 104607016 A CN104607016 A CN 104607016A
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- carbon dioxide
- power plant
- absorption
- flue gas
- solvent
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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
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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
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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
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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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
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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- Treating Waste Gases (AREA)
Abstract
The invention provides a thermal power plant carbon dioxide recovery method. The thermal power plant carbon dioxide recovery method comprise steps of flue gas pretreatment, carbon dioxide absorption solvent preparation, absorption of carbon dioxide by an absorbing tower, exhaust gas water washing purification, carbon dioxide regeneration, and solvent recycling. According to the thermal power plant carbon dioxide recovery method, three absorbents, including monoethanolamine (MEA), N-Methyldiethanolamine (MDEA), and piperazine (PZ), are mixed at a certain mole ratio so as to obtain a carbon dioxide absorption solvent; CO2 comprehensive recovery rate is higher than 90%; low absorption efficiency of single solvents is avoided; energy consumption of CO2 regeneration is reduced greatly; and corrosivity of amine-enriched solution obtained via CO2 absorption is reduced.
Description
Technical field
The present invention relates to the recycling technique of carbon dioxide in a kind of industrial waste gas, especially steam power plant's carbon dioxide recovery technique
.
Background technology
Steam power plant produces the Power Secondary energy by this primary energy of combustion of fossil fuels, a large amount of carbon dioxide is discharged in production process, and according to the study, carbon dioxide is the arch-criminal causing greenhouse effects thus cause global warming, strictly must control the discharge capacity of carbon dioxide, the carbon dioxide produced in power generation process is reclaimed.At present, recovery before the recovery method of steam power plant's carbon dioxide generally can be divided into burning, oxygen-enriched combusting are reclaimed and reclaim three classes after burning.
Reclaim before burning and be mainly used in integrated gasification combined cycle for power generation system (IGCC), the gaseous mixture of carbon monoxide and hydrogen is obtained by coal gasification, be called as synthesis gas, pass into after steam converts carbon monoxide to carbon dioxide, carbon dioxide is separated from synthesis gas, and hydrogen is used for generating electricity as carbon-free turbine fuel.The technical requirement of the method to steam turbine is higher, and initial investment is huge, is also in the bench-scale testing stage at present, is unsuitable for ubiquitous steam power plant.
Oxygen-enriched combusting reclaims and refers to oxygen replacement air for combustion reaction, namely coal dust burns in the oxygen of purity more than 95%, obtain the gaseous mixture of steam and carbon dioxide, steam is condensed in compression and dehydration workshop section, and gaseous mixture condensation obtains after falling steam containing micro-N2, NO
x, SO
xcarbon dioxide.Its advantage is that recovery rate of CO 2 can reach more than 97%, and the discharge capacity of nitrogen oxide can drop to very low.The method needs provision of purified oxygen, costly, in addition, need resistant to elevated temperatures boiler, because flame temperature is very high in pure oxygen, therefore, need cyclic part carbon dioxide to reduce the temperature of burning in boiler, the nitrogen oxide wherein contained in addition has a strong impact on the recovery of carbon.
Reclaiming after burning is adopt a kind of maximum methods, is collect carbon dioxide in the flue gas discharged after combustion, wherein representative with chemical solvent absorption method most again.Present faintly acid in aqueous according to carbon dioxide, the principle utilizing acid-base neutralization to react uses alkalescent solvent to carry out CO
2absorption, solution carrys out regenerated solvent by its back reaction again and reclaims carbon dioxide.Two kinds of methods that present commercial Application is maximum are hot potash method and hydramine method.Hot potash method utilizes the solution of potassium carbonate of heat to absorb the carbon dioxide in flue gas.In absorption process, potash absorbing carbon dioxide reaction Formed potassium hydrogen phthalate, then can be heated and again discharge carbon dioxide, and obtain solution of potassium carbonate, can reuse in desorption process.Hydramine method use solvent is the hydramine alkaline aqueous solution with hydroxyl and amido, contacts also therefrom absorbing carbon dioxide, then in desorber, go out carbon dioxide product by thermal desorption and regenerate alkanolamine solution, recycle in absorption tower with flue gas adverse current.The maximum shortcoming of hydramine method is that power consumption is serious, and the carbamic acid solution after absorbing carbon dioxide has very large corrosivity, so find the emphasis that low, low to the equipment corrosion speed solvent of regeneration energy consumption is present stage research.
Summary of the invention
The object of the invention is the above-mentioned shortcoming for overcoming current steam power plant carbon dioxide recovery technique, adopting the mixed solvent of optimal components ratio to recycle carbon dioxide.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of steam power plant carbon dioxide recovery technique is provided, comprises the following steps:
(1) flue gas pretreatment: the pretreatment such as denitration, dedusting, desulfurization are carried out to boiler of power plant discharge flue gas, removes to subsequent technique and the harmful substance and the dust granules that air are had to pollution in flue gas, become clean flue gas;
(2) carbon dioxide absorption solvent configuration: be configured to carbon dioxide absorption solvent by certain mol ratio by MEA MEA, N methyldiethanol amine MDEA and piperazine PZ tri-kinds of absorbents;
(3) absorption tower absorbing carbon dioxide: clean flue gas is sent into be full of in the absorption tower of carbon dioxide absorption solvent by blower fan pressurization and carried out gas-liquid counter current contact generation chemical reaction, carbon dioxide in flue gas is absorbed by carbon dioxide absorption dissolution with solvents, forms rich amine aqueous solution;
(4) waste gas water washing cleaning: the waste gas removed after carbon dioxide passes into water scrubber, and water and the direct counter current contacting of waste gas remove the carbon dioxide absorption solvent evaporated, and the waste gas after purification directly enters in air;
(5) carbon dioxide regeneration: rich amine aqueous solution sends into regenerator through poor rich liquid heat exchanger recovery waste heat, after the Steam Heating of reboiler heats up, the desorb in regenerator of rich amine aqueous solution discharges carbon dioxide, become poor amine aqueous solution, the carbon dioxide discharged, through overcompression, dehydration and liquefaction process, obtains liquid carbon dioxide;
(6) solvent recycles: poor amine aqueous solution is flowed out by regenerator and after heat exchanger cooling, enters absorption tower and recycle as carbon dioxide absorption solvent.
Described in step (2), the mol ratio of three kinds of absorbents is MEA:MDEA:PZ=5:4:1.
The present invention adopts MEA MEA, N methyldiethanol amine MDEA and piperazine PZ tri-kinds of absorbents to be configured to carbon dioxide absorption solvent by certain mol ratio, CO
2comprehensive recovery can reach more than 90%, overcomes the shortcoming that single solvent absorption efficiency is low, and CO
2energy consumption needed for regeneration stage reduces greatly, absorbs CO
2after the corrosivity of rich amine aqueous solution decrease.
Detailed description of the invention
Below by an embodiment, the invention will be further described.
A kind of steam power plant carbon dioxide recovery technique, comprises the following steps:
(1) flue gas pretreatment: the pretreatment such as denitration, dedusting, desulfurization are carried out to boiler of power plant discharge flue gas, removes to subsequent technique and the harmful substance and the dust granules that air are had to pollution in flue gas, become clean flue gas;
(2) carbon dioxide absorption solvent configuration: be configured to carbon dioxide absorption solvent by certain mol ratio by MEA MEA, N methyldiethanol amine MDEA and piperazine PZ tri-kinds of absorbents; The mol ratio of three kinds of absorbents is MEA:MDEA:PZ=5:4:1;
(3) absorption tower absorbing carbon dioxide: clean flue gas is sent into be full of in the absorption tower of carbon dioxide absorption solvent by blower fan pressurization and carried out gas-liquid counter current contact generation chemical reaction, carbon dioxide in flue gas is absorbed by carbon dioxide absorption dissolution with solvents, forms rich amine aqueous solution;
(4) waste gas water washing cleaning: the waste gas removed after carbon dioxide passes into water scrubber, and water and the direct counter current contacting of waste gas remove the carbon dioxide absorption solvent evaporated, and the waste gas after purification directly enters in air;
(5) carbon dioxide regeneration: rich amine aqueous solution sends into regenerator through poor rich liquid heat exchanger recovery waste heat, after the Steam Heating of reboiler heats up, the desorb in regenerator of rich amine aqueous solution discharges carbon dioxide, become poor amine aqueous solution, the carbon dioxide discharged, through overcompression, dehydration and liquefaction process, obtains liquid carbon dioxide;
(6) solvent recycles: poor amine aqueous solution is flowed out by regenerator and after heat exchanger cooling, enters absorption tower and recycle as carbon dioxide absorption solvent.
Claims (2)
1. steam power plant's carbon dioxide recovery technique, is characterized in that comprising the following steps:
(1) flue gas pretreatment: the pretreatment such as denitration, dedusting, desulfurization are carried out to boiler of power plant discharge flue gas, removes to subsequent technique and the harmful substance and the dust granules that air are had to pollution in flue gas, become clean flue gas;
(2) carbon dioxide absorption solvent configuration: be configured to carbon dioxide absorption solvent by certain mol ratio by MEA MEA, N methyldiethanol amine MDEA and piperazine PZ tri-kinds of absorbents;
(3) absorption tower absorbing carbon dioxide: clean flue gas is sent into be full of in the absorption tower of carbon dioxide absorption solvent by blower fan pressurization and carried out gas-liquid counter current contact generation chemical reaction, carbon dioxide in flue gas is absorbed by carbon dioxide absorption dissolution with solvents, forms rich amine aqueous solution;
(4) waste gas water washing cleaning: the waste gas removed after carbon dioxide passes into water scrubber, and water and the direct counter current contacting of waste gas remove the carbon dioxide absorption solvent evaporated, and the waste gas after purification directly enters in air;
(5) carbon dioxide regeneration: rich amine aqueous solution sends into regenerator through poor rich liquid heat exchanger recovery waste heat, after the Steam Heating of reboiler heats up, the desorb in regenerator of rich amine aqueous solution discharges carbon dioxide, become poor amine aqueous solution, the carbon dioxide discharged, through overcompression, dehydration and liquefaction process, obtains liquid carbon dioxide;
(6) solvent recycles: poor amine aqueous solution is flowed out by regenerator and after heat exchanger cooling, enters absorption tower and recycle as carbon dioxide absorption solvent.
2. steam power plant according to claim 1 carbon dioxide recovery technique, is characterized in that: described in step (2), the mol ratio of three kinds of absorbents is MEA:MDEA:PZ=5:4:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310535502.XA CN104607016A (en) | 2013-11-04 | 2013-11-04 | Thermal power plant carbon dioxide recovery method |
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| CN201310535502.XA CN104607016A (en) | 2013-11-04 | 2013-11-04 | Thermal power plant carbon dioxide recovery method |
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| CN104607016A true CN104607016A (en) | 2015-05-13 |
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| CN201310535502.XA Pending CN104607016A (en) | 2013-11-04 | 2013-11-04 | Thermal power plant carbon dioxide recovery method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892953A (en) * | 2017-10-27 | 2018-04-10 | 中石化宁波工程有限公司 | A kind of half lean absorbent regeneration technology |
| CN110498394A (en) * | 2019-05-30 | 2019-11-26 | 赫普能源环境科技有限公司 | A kind of thermal power plant's coke hydrogen generating system and method |
-
2013
- 2013-11-04 CN CN201310535502.XA patent/CN104607016A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892953A (en) * | 2017-10-27 | 2018-04-10 | 中石化宁波工程有限公司 | A kind of half lean absorbent regeneration technology |
| CN110498394A (en) * | 2019-05-30 | 2019-11-26 | 赫普能源环境科技有限公司 | A kind of thermal power plant's coke hydrogen generating system and method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150513 |
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| WD01 | Invention patent application deemed withdrawn after publication |