CN101485952A - System with transcritical carbon dioxide heat pump for providing heat to CCS - Google Patents

System with transcritical carbon dioxide heat pump for providing heat to CCS Download PDF

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CN101485952A
CN101485952A CNA2009100766490A CN200910076649A CN101485952A CN 101485952 A CN101485952 A CN 101485952A CN A2009100766490 A CNA2009100766490 A CN A2009100766490A CN 200910076649 A CN200910076649 A CN 200910076649A CN 101485952 A CN101485952 A CN 101485952A
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heat
carbon dioxide
trans
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CNA2009100766490A
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CN101485952B (en
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姜培学
张有为
张富珍
王淑娟
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清华大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/151Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The invention discloses a system for providing heat quantity for CCS (carbon dioxide capture and storage) by adopting a transcritical carbon dioxide heat pump, which belongs to the field of energy utilization and coal fired power generation. The system comprises two parts of a transcritical carbon dioxide heat pump system and the system for capturing carbon dioxide by a chemical absorption method in a coal-fired power plant, wherein the two parts are connected into the system capable of saving energy resources by a boiling unit 12, and the boiling unit 12 of the system capturing the carbon dioxide by the chemical absorption method in the coal-fired power plant is an air cooler of the transcritical carbon dioxide heat pump system. The heat pump device can improve the economical efficiency of the carbon dioxide captured by a chemical absorption method in the coal-fired power plant, and can reduce the water consumption amount of the coal-fired power plant.

Description

Adopt CO 2 trans-critical heat pump that the system of heat is provided for CCS
Technical field
The invention belongs to using energy source and coal fired power generation field, particularly a kind of employing CO 2 trans-critical heat pump is the system that the CCS of coal-burning power plant (carbon dioxide capture with seal up for safekeeping) provides heat.Specifically the critical-cross carbon dioxide high temperature heat pump device being applied to coal-burning power plant's chemical absorption method catches in the system of carbon dioxide, thereby improve the economy that coal-burning power plant's chemical absorption method is caught carbon dioxide, and can reduce the water consumption of coal-burning power plant, also realize the recycling of carbon dioxide simultaneously.
Background technology
The reduction of discharging of carbon dioxide isothermal chamber gas more and more is subjected to the extensive concern of international community, has become the focus of international energy field research and development.The core of whole world reply climate change is to reduce greenhouse gas emission, wherein mainly is the CO2 emission that reduces energy-consuming.Coal-burning power plant's CO2 emission is the main emission source of China's greenhouse gases, accounts for 50% of China's CO2 emission total amount.In recent years, along with increasing rapidly of thermoelectricity installed capacity, the absolute quantity of coal-burning power plant's CO2 emission and relative scale also will further increase.Because China's energy resource structure is based on coal fired power generation, and, from coal-fired flue-gas, effectively remove carbon dioxide with very urgent from now on to the long-term input of coal fired power generation.At present the coal-burning power plant catches that the method for carbon dioxide mainly contains absorption process, absorption method and membrane separation process etc. in the flue gas, and chemical absorption method is a most ripe technical method at present.It is 80-120 ℃ of desorb that this method is caught the chemical absorbent that carbon dioxide adopts, and existing heating technique is to extract steam to heat, and generating efficiency is declined to a great extent.And the condensation waste heat of the exhaust steam of coal-burning power plant's steam turbine outlet at present generally is to adopt by the wet cooling tower heat radiation, has so not only wasted big energy, and can impact environment.Be to extract the Steam Heating chemical absorbent to cause generating efficiency to descend on the one hand, wasted a large amount of condensation waste heats on the other hand again.Therefore chemical absorption method is difficult to apply in the coal-burning power plant.
The typical coal-burning power plant chemical absorption method that Figure 1 shows that present use is caught carbon dioxide system, its structure is as follows: the exit of air-introduced machine 3 links to each other with 4 bottoms, absorption tower, 4 bottoms, absorption tower link to each other with rich solution pump 9 import departments, rich solution pump 9 exits link to each other with the path m import of heat exchanger 8, the path m outlet of heat exchanger 8 links to each other with regenerator 10 tops, regenerator 10 bottoms link to each other with the path n import of heat exchanger 8, the path n outlet of heat exchanger 8 links to each other with lean pump 7 imports, lean pump 7 outlets link to each other with water cooler 6 imports, and water cooler 6 outlets link to each other with 4 tops, absorption tower.Regenerator 10 middle parts (on) link to each other with boiling device 12 import h, boiling device 12 outlet f link to each other with regenerator 10 middle parts (descending).Regenerator 10 tops link to each other with cooler 11 imports, and cooler 11 outlets link to each other with separator 13 imports.Underground tank 17 links to each other with regenerator 10 tops.Cleaning solution reservoir 2 links to each other with 4 tops, absorption tower, as shown in Figure 1.
Coal-burning power plant shown in Figure 1 chemical absorption method is caught carbon dioxide system, and the bottom-up absorption tower 4 of flowing through of flue gas forms counter current contacting with the absorption liquid of going into tower from top, and carbon dioxide is removed.Decarburization flue gas after the purification is discharged from cat head.The absorption liquid (rich solution) that has absorbed acid gas is delivered to regenerator 10 by 9 pressurizations of rich solution pump.The consumption of steam utilizes the waste heat of the absorbent solution (lean solution) after regenerating that rich solution is heated when regenerating for reducing rich solution, also reaches the purpose of cooling actified solution simultaneously, and rich solution and lean solution are carried out heat exchange in poor rich liquid heat exchanger 8.Rich solution enters from regenerator 10 tops, by stripping desorb partial CO 2, enters boiling device 12 then, is heated by steam 16, makes the further desorb of carbon dioxide wherein.Lean solution behind the desorb carbon dioxide is gone out by regenerator 10 underflows, after poor rich liquid heat exchanger 8 heat exchange, delivers to water cooler 6 with lean pump 7, enters absorption tower 4 after the cooling.Solvent comes and goes the technical process that circulation constitutes continuous absorption and desorption carbon dioxide.Eject the carbon dioxide and the vapour mixture that come from regenerator 10 and pass through cooler 11 cooling condensations, separate via separator 13 carbonated drinks, condensed water is isolated carbon dioxide and is entered follow-up compression handling procedure by backflow fluid infusion retrieval system.This system owing to extract the Steam Heating chemical absorbent, declines to a great extent generating efficiency.
In addition, inefficiency in China's coal-burning power plant's water and waste are startling, and 300,000 kilowatts of power stations per hour need to replenish cooling water 500-2000 ton, wherein are to be discharged in the atmosphere by cooling tower more than 65%.The North China is the important Industrial Complex of China, water resource only account for the whole nation 4.6%, the per capita quantity not sufficient whole nation per capita 1/5; Be distributed in the northern area of the relative shortage of water resource, the situation of having aggravated local shortage of water resources and water consumption industries such as China's thermoelectricity, metallurgy and petrochemical industry are many according to the mineral resources condition.Lack of water has greatly limited industrial development, has also caused very big influence to people's lives, and coal-burning power plant's water conservation is very urgent.
Summary of the invention
The objective of the invention is to overcome the defective of said system, it is the system that CCS (carbon dioxide capture with seal up for safekeeping) provides heat that a kind of employing CO 2 trans-critical heat pump is provided, adopt the critical-cross carbon dioxide high temperature heat pump device, draw heat from coal-burning power plant's condensation waste heat, improve the carbon dioxide temperature by heat pump cycle, make it can directly heat the coal-burning power plant and catch the chemical absorbent that carbon dioxide is used in the flue gas, finish desorption process.
The technical solution used in the present invention:
Adopt CO 2 trans-critical heat pump for CCS provides the system of heat, comprise that CO 2 trans-critical heat pump system and coal-burning power plant's chemical absorption method catch two parts of carbon dioxide system;
Described two parts are connected by boiling device 12;
Compressor 22 outlets of described CO 2 trans-critical heat pump system link to each other with boiling device 12 import g, boiling device 12 outlet e link to each other with internal exchanger 21 path d imports, internal exchanger 21 path d outlet links to each other with choke valve 19 imports, choke valve 19 outlets link to each other with evaporimeter 20 path a imports, evaporimeter 20 path a outlet links to each other with internal exchanger 21 path c imports, internal exchanger 21 path c outlet links to each other with compressor 22 imports, evaporimeter 20 path b outlet links to each other with condenser 18 import j, condenser 18 outlet i link to each other with evaporimeter 20 path b imports, the outlet of condenser 18 import k and exhaust steam in steam turbine links to each other, and condenser 18 exports 1 and links to each other with the boiler condensation water inlet.
Described CO 2 trans-critical heat pump system adopts carbon dioxide as working medium, and its working medium derives from the desorb reaction that takes place in the boiling device 12.
Described carbon dioxide working medium is the heat release cooling in boiling device 12, and the heating coal-burning power plant catches the chemical absorbent that carbon dioxide is used in the flue gas, makes it finish desorption process.
The condensation waste heat of origin of heat in exhaust steam in steam turbine of described CO 2 trans-critical heat pump system.
Described condenser 18 is used for the heat exchange of exhaust steam in steam turbine and cooling water.
Described evaporimeter 20 is used to come from the water outlet of condenser 18 and the heat exchange of carbon dioxide working medium.
Described internal exchanger 21 is used for the high temperature carbon dioxide working medium heat exchange that carbon dioxide working medium and boiling device come out, and increases its degree of superheat, reduces the compressor work amount.
The carbon dioxide working medium temperature of described compressor 22 outlets is 80~140 degree.
Described boiling device 12 is the air cooler of CO 2 trans-critical heat pump system.
The present invention adopts critical-cross carbon dioxide high temperature heat pump device draw heat from condensation waste heat, is used to heat chemical absorbent, has avoided on the one hand extracting the generating efficiency decline that steam causes, and has reduced the environment that the condensation waste heat discharging causes environment on the other hand.In addition, the cooling water flow of the wet cooling tower of flowing through reduces greatly, has reduced the water consumption of wet cooling tower, has played the effect of water saving, has also realized the recycling of carbon dioxide simultaneously.
Description of drawings
Fig. 1 catches the carbon dioxide system schematic diagram for typical coal-burning power plant chemical absorption method;
Fig. 2 catches the carbon dioxide system schematic diagram for the coal-burning power plant's chemical absorption method that adopts CO 2 trans-critical heat pump.
1-demineralized water or regeneration gas condensed water; 2-cleaning solution reservoir; The 3-air-introduced machine; The 4-absorption tower; 5-decarburization flue gas; 6 water coolers; The 7-lean pump; The 8-heat exchanger; 9-rich solution pump; The 10-regenerator; The 11-cooler; 12-boiling device/air cooler; The 13-separator; The 16-steam-gas inlet; The 17-underground tank; The 18-condenser; The 19-choke valve; The 20-evaporimeter; The 21-internal exchanger; The 22-compressor
The specific embodiment
Describe below in conjunction with accompanying drawing 2.
Coal-burning power plant's chemical absorption method of employing CO 2 trans-critical heat pump shown in Figure 2 is caught carbon dioxide system, the exit of air-introduced machine 3 links to each other with 4 bottoms, absorption tower, 4 bottoms, absorption tower link to each other with rich solution pump 9 import departments, rich solution pump 9 exits link to each other with the path m import of heat exchanger 8, the path m outlet of heat exchanger 8 links to each other with regenerator 10 tops, regenerator 10 bottoms link to each other with the path n import of heat exchanger 8, the path n outlet of heat exchanger 8 links to each other with lean pump 7 imports, lean pump 7 outlets link to each other with water cooler 6 imports, and water cooler 6 outlets link to each other with 4 tops, absorption tower.Regenerator 10 middle parts (on) link to each other with boiling device 12 import h, boiling device 12 outlet f link to each other with regenerator 10 middle parts (descending).Regenerator 10 tops link to each other with cooler 11 imports, and cooler 11 outlets link to each other with separator 13 imports.Underground tank 17 links to each other with regenerator 10 tops.Cleaning solution reservoir 2 links to each other with 4 tops, absorption tower.Compressor 22 outlets link to each other with boiling device 12 import g, boiling device 12 outlet e link to each other with internal exchanger 21 path d imports, internal exchanger 21 path d outlet links to each other with choke valve 19 imports, choke valve 19 outlets link to each other with evaporimeter 20 path a imports, evaporimeter 20 path a outlet links to each other with internal exchanger 21 path c imports, and internal exchanger 21 path c outlet links to each other with compressor 22 imports.Evaporimeter 20 path b outlet links to each other with condenser 18 import j, and condenser 18 outlet i link to each other with evaporimeter 20 path b imports.Condenser (18) import (k) links to each other with the exhaust steam in steam turbine outlet, and condenser (18) outlet (1) links to each other with the boiler condensation water inlet.
Adopted coal-burning power plant's chemical absorption method of CO 2 trans-critical heat pump to catch carbon dioxide system, the bottom-up absorption tower 4 of flowing through of flue gas forms counter current contacting with the absorption liquid of going into tower from top, and carbon dioxide is removed.Decarburization flue gas after the purification is discharged from cat head.The absorption liquid (rich solution) that has absorbed acid gas is delivered to regenerator 10 by 9 pressurizations of rich solution pump.The consumption of steam utilizes the waste heat of the absorbent solution (lean solution) after regenerating that rich solution is heated when regenerating for reducing rich solution, also reaches the purpose of cooling actified solution simultaneously, and rich solution and lean solution are carried out heat exchange in poor rich liquid heat exchanger 8.Rich solution enters from regenerator 10 tops, by stripping desorb partial CO 2, enters boiling device 12 then, and the carbon dioxide working medium heating by from compressor 22 makes the further desorb of carbon dioxide in the rich solution.Lean solution behind the desorb carbon dioxide is gone out by regenerator 10 underflows, after poor rich liquid heat exchanger 8 heat exchange, delivers to water cooler 6 with lean pump 7, enters absorption tower 4 after the cooling.Solvent comes and goes the technical process that circulation constitutes continuous absorption and desorption carbon dioxide.Eject the carbon dioxide and the vapour mixture that come from regenerator 10 and pass through cooler 11 cooling condensations, separate via separator 13 carbonated drinks, condensed water is isolated carbon dioxide and is entered follow-up compression handling procedure by backflow fluid infusion retrieval system.The exhaust steam in steam turbine condenser 18 of flowing through is with the cooling water heat exchange.Cooling water is by after the exhaust steam heating, and the evaporimeter 20 of the CO 2 trans-critical heat pump system that flows through with the carbon dioxide heat exchange, is passed to carbon dioxide with heat, makes the carbon dioxide heat absorption evaporation after the throttling.After the carbon dioxide heat absorption, the internal exchanger 21 of flowing through increases its degree of superheat, enters compressor 22 then, and the carbon dioxide temperature of outlet reaches 120 degree.Then, the carbon dioxide of high temperature is admitted to boiling device 12, and the heating chemical absorbent makes its desorb, and carbon dioxide release heat temperature reduces.Carbon dioxide enters internal exchanger 21 and carries out backheat after flowing out boiling device 12, at choke valve 19 adiabatic throttlings, next enters evaporimeter 20 then, finishes heat pump cycle.
Generating set calculates by generating efficiency 40%, and coal burning caloricity is 330/40%=825MW, and the heat of discharging is 495MW.Unit CCS institute calorific requirement is about 165MW, if heat pump with COP=3.5, from condensation waste heat, extract the required 165MW heat of CCS, the heat pump running needs power consumption 47MW, power plant output electric weight is 330MW-47MW=283MW, generating efficiency is reduced to 283MW/825MW=34.3% by original 40%, has descended 5.7%.Adopt wet cooling tower, among the condensation waste heat 495MW, press cooling water into and out of 8.5 ℃ of calculating of the tower temperature difference, cooling water flow is 40032m 3/ h, the cooling water heat dissipation capacity is 395MW; The flue gas windage is 100MW.The cooling water loss amount is about 400~600m 3/ h.
Adopt heat pump to extract 165MW and be used for CCS, cooling water inflow is by 40032m 3/ h is reduced to 23310m 3/ h, circular flow has reduced 16722m 3/ h, the cooling water loss amount reduces by 167~251m 3/ h, the minimizing ratio is 41.8%.

Claims (8)

1, adopt CO 2 trans-critical heat pump that the system of heat is provided for CCS, comprise that CO 2 trans-critical heat pump system and coal-burning power plant's chemical absorption method catch two parts of carbon dioxide system, it is characterized in that described two parts are connected by boiling device (12); Compressor (22) outlet of described CO 2 trans-critical heat pump system links to each other with boiling device (12) import (g), boiling device (12) outlet (e) links to each other with internal exchanger (21) path (d) import, internal exchanger (21) path (d) outlet links to each other with choke valve (19) import, choke valve (19) outlet links to each other with evaporimeter (20) path (a) import, evaporimeter (20) path (a) outlet links to each other with internal exchanger (21) path (c) import, internal exchanger (21) path (c) outlet links to each other with compressor (22) import, evaporimeter (20) path (b) outlet links to each other with condenser (18) import (j), condenser (18) outlet (i) links to each other with evaporimeter (20) path (b) import, condenser (18) import (k) links to each other with the exhaust steam in steam turbine outlet, and condenser (18) outlet (1) links to each other with the boiler condensation water inlet.
2, according to the described employing CO 2 trans-critical heat pump of claim 1 for CCS provides the system of heat, it is characterized in that described CO 2 trans-critical heat pump system adopts carbon dioxide as working medium.
3, the system of heat is provided for CCS according to claim 1 or 2 described employing CO 2 trans-critical heat pumps, it is characterized in that, described carbon dioxide working medium is the heat release cooling in boiling device (12), and the heating coal-burning power plant catches the chemical absorbent that carbon dioxide is used in the flue gas, makes it finish desorption process.
4, according to claim 1 or 2 described employing CO 2 trans-critical heat pumps for CCS provides the system of heat, it is characterized in that the condensation waste heat of origin of heat in exhaust steam in steam turbine of described CO 2 trans-critical heat pump system.
5, according to claim 1 or 2 described employing CO 2 trans-critical heat pumps for the system that CCS provides heat, it is characterized in that described condenser (18) is used for the heat exchange of exhaust steam in steam turbine and cooling water.
6, according to claim 1 or 2 described employing CO 2 trans-critical heat pumps for the system that CCS provides heat, it is characterized in that described evaporimeter (20) is used to come from the water outlet of condenser (18) and the heat exchange of carbon dioxide working medium.
7, the system of heat is provided for CCS according to claim 1 or 2 described employing CO 2 trans-critical heat pumps, it is characterized in that described internal exchanger (21) is used for the high temperature carbon dioxide working medium heat exchange that carbon dioxide working medium and boiling device come out, increase its degree of superheat, reduce the compressor work amount.
8, according to claim 1 or 2 described employing CO 2 trans-critical heat pumps for the system that CCS provides heat, it is characterized in that the carbon dioxide working medium temperature of described compressor (22) outlet is 80~140 degree.
CN2009100766490A 2009-01-12 2009-01-12 System with transcritical carbon dioxide heat pump for providing heat to CCS CN101485952B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102049174A (en) * 2009-10-28 2011-05-11 中国石油化工股份有限公司 Method for partially separating carbon dioxide from gas mixture
CN102283284A (en) * 2011-06-16 2011-12-21 上海理工大学 Transcritical carbon dioxide heat pump milk disinfecting and cooling system and method
CN102519299A (en) * 2011-12-15 2012-06-27 东南大学 System capable of improving cooling effect of cooling tower by means of reducing moisture content of air
CN102824818A (en) * 2012-08-24 2012-12-19 中国石油化工股份有限公司 Device for reducing energy consumption of flue gas CO2 capturing system and increasing CO2 recovery rate
CN104154521A (en) * 2014-08-12 2014-11-19 天津大学 Auxiliary solar energy carbon-dioxide-capturing and heating integrated system and method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942734A (en) * 1989-03-20 1990-07-24 Kryos Energy Inc. Cogeneration of electricity and liquid carbon dioxide by combustion of methane-rich gas
CN1162667C (en) * 2003-04-10 2004-08-18 上海交通大学 Throttle control mechanism of cross-critical CO2 refrigerating system
CN100483041C (en) * 2004-09-29 2009-04-29 上海交通大学 Over critical CO2 refrigeration and rotary wheel dehumidifying combined air conditioning system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102049174A (en) * 2009-10-28 2011-05-11 中国石油化工股份有限公司 Method for partially separating carbon dioxide from gas mixture
CN102283284A (en) * 2011-06-16 2011-12-21 上海理工大学 Transcritical carbon dioxide heat pump milk disinfecting and cooling system and method
CN102283284B (en) * 2011-06-16 2013-04-03 上海理工大学 Transcritical carbon dioxide heat pump milk disinfecting and cooling system and method
CN102519299A (en) * 2011-12-15 2012-06-27 东南大学 System capable of improving cooling effect of cooling tower by means of reducing moisture content of air
CN102519299B (en) * 2011-12-15 2013-05-01 东南大学 System capable of improving cooling effect of cooling tower by means of reducing moisture content of air
CN102824818A (en) * 2012-08-24 2012-12-19 中国石油化工股份有限公司 Device for reducing energy consumption of flue gas CO2 capturing system and increasing CO2 recovery rate
CN104154521A (en) * 2014-08-12 2014-11-19 天津大学 Auxiliary solar energy carbon-dioxide-capturing and heating integrated system and method thereof
CN104154521B (en) * 2014-08-12 2015-12-09 天津大学 The integrated system of a kind of solar energy auxiliary carbon dioxide trapping and heat supply and method thereof

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