CN103752142B - A kind of solar energy auxiliary carbon dioxide trapping integrated system - Google Patents
A kind of solar energy auxiliary carbon dioxide trapping integrated system Download PDFInfo
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- CN103752142B CN103752142B CN201410037906.0A CN201410037906A CN103752142B CN 103752142 B CN103752142 B CN 103752142B CN 201410037906 A CN201410037906 A CN 201410037906A CN 103752142 B CN103752142 B CN 103752142B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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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
- Y02P20/133—Renewable energy sources, e.g. sunlight
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Abstract
The invention discloses the integrated system of a kind of solar energy auxiliary carbon dioxide trapping, form primarily of power generation sub-system, collecting carbonic anhydride subsystem and solar energy heating subsystem three part.Connect mainly through boiler water-suppling heater, reboiler and Flue Gas Pretreatment Device between each subsystem, form whole integrated system.Heat output for solar energy heating subsystem passes through to adopt different connected modes, the height of the energy requirement grade of associated components between solar energy heating and power generation sub-system and collecting carbonic anhydride subsystem is carried out rational distribution and integrated, achieve the cascade utilization of energy, significantly can reduce the energy consumption of steam pumping from power plant steam turbine, the double effects of renewable energy utilization and power plant's carbon dioxide discharge-reduction is realized, the strong large-scale application promoting China's solar energy and flue gas trapping integrated technology while maintaining power plant's stability.
Description
Technical field
The present invention relates to low-temperature solar energy auxiliary carbon dioxide trapping integrated technology in one, be specifically related to the integrated of middle low-temperature solar energy collecting system and carbon dioxide in flue gas trapping system, solar energy is utilized to provide the energy compensating of carbon dioxide capture system, while realizing solar energy cascade utilization, effectively reduce the efficiency decline that power plant brings because of steam pumping.
Background technology
In current chemical absorption method trapping system, need during regeneration of waste liquor to consume a large amount of power plant steam, cause the decline of power plant efficiency, add trapping cost, become restriction CO
2the principal element of trapping technique large-scale application.
For CO in existing power plant aspect flue gas
2trapping, after burning, carbon traps this technical scheme and is extensively approved, and wherein monoethanolamine (MEA) method is wherein comparatively ripe commercial methods, has the potentiality of large-scale application.But the regenerative process in desorber often needs temperature to reach the heat energy of 100-120 DEG C, meanwhile, the power consumption of reboiler reaches 3-4GJ/ ton CO
2.Conventional power plant adopts gas turbine to draw gas as thermal source usually, meets the energy requirements of regenerative process, thus causes decrease in power generation efficiency 15-30%.Therefore, the power consumption (needed for reboiler electric energy needed for heat energy, rich or poor liquid circulating pump etc.) that technological process is corresponding and the height trapping cost thereupon caused, become the maximum resistance factor that MEA process is promoted.
Solar energy is as the reproducible clean energy resource of one, and its developing and utilizingpotentiality is very huge.Solar energy is combined with existing carbon dioxide capture system, the heat energy utilizing solar energy heating to produce trapping system desorb temperature required carries out desorb, significantly can reduce the energy consumption of steam pumping from power plant steam turbine, the double effects of regenerative resource and power plant's carbon dioxide discharge-reduction is realized, the strong large-scale application promoting China's solar energy and flue gas trapping integrated technology while maintaining power plant's stability.
Summary of the invention
For the high energy consumption problem that current trapping system brings, the present invention proposes a kind of solar energy auxiliary carbon dioxide trapping integrated system, the energy requirements that middle low-temperature solar energy thermal-arrest compensates traditional trapping system can be made full use of according to the different relations of being integrated and connected, while realizing solar energy cascade utilization, effectively reduce the efficiency decline that power plant brings because of steam pumping.
In order to effectively solve technical problem above, a kind of solar energy auxiliary carbon dioxide trapping of the present invention integrated system, comprises power generation sub-system, collecting carbonic anhydride subsystem, solar energy heating subsystem; Described power generation sub-system is by water-to-water heat exchanger, boiler, steam turbine and exhaust steam condenser steam generating system in series; Described collecting carbonic anhydride subsystem comprises Flue Gas Pretreatment Device, absorption tower, rich solution pump, lean solution condenser, lean/rich liquid heat exchanger, lean pump, desorber, gas-liquid separator and reboiler; The exhaust opening of described boiler is connected with the entrance of described Flue Gas Pretreatment Device, and the outlet of described Flue Gas Pretreatment Device connects the gas access of bottom, absorption tower; The outlet of described lean solution condenser is connected with the upper liquid spray inlet on described absorption tower; Described lean/rich liquid heat exchanger is connected with the entrance of the rich solution spray inlet on described lean solution delivery side of pump, described desorber top, described rich solution delivery side of pump and described lean solution condenser respectively; Entrance bottom described desorber is connected with the outlet of described reboiler and the entrance of described lean pump respectively, and the gas vent at described desorber top is connected to the bottom of described gas-liquid separator, as the backflow of condensate liquid; The extraction opening of described steam turbine is connected with the high temperature side entrance of described reboiler, and the high temperature side outlet of described reboiler is connected with described exhaust steam condenser; Connecting line between described steam turbine and described reboiler is provided with the valve that draws gas; Described solar energy heating subsystem is composed in series by solar thermal collector series and working medium pump,
The present invention provides two kinds of integration modes according to the heat-collecting temperature scope of solar energy, namely the heat output of described solar energy heating subsystem comprises one of following two kinds of situations with the annexation between described reboiler: Yi Zhongshi: the sender property outlet end in described solar energy heating subsystem is connected with the described high temperature side entrance of water-to-water heat exchanger of giving, described outlet to the high temperature side of water-to-water heat exchanger is connected with the high temperature side entrance of described reboiler, and the high temperature side outlet of described reboiler is connected with the working medium arrival end of described solar energy heating subsystem; This connected mode can by solar energy heating subsystem thermal-arrest to high-temperature in about 200-350 DEG C, steam power plant's feed temperature is added by heat exchanger, heat exchange is proceeded through reboiler again after heat exchange, to provide the heat of reboiler, and the insufficient section of reboiler institute calorific requirement is provided by the steam extracting steam turbine low-temp low-pressure again, such formation solar energy heating circulation, achieves the cascade utilization of energy grade, reduces the irreversible loss of system; Another kind is: the sender property outlet end of described solar energy heating subsystem is connected with the high temperature side arrival end of described reboiler, the high temperature side outlet of described reboiler is connected with the working medium arrival end of described solar energy heating subsystem, this connected mode can directly utilize solar energy heating subsystem to be utilized to the temperature range supply reboiler needed for reboiler by the working fluid thermal-arrest in solar thermal collector series, while simplification system, also take full advantage of solar thermal collection system collecting efficiency higher at low temperatures, decrease working fluid radiation loss at high temperature.Above-mentioned two kinds of connected modes all devise the connecting line from extracted steam from turbine, and can utilize to draw gas when solar energy is not enough like this provides heat.
In the present invention, can produce a large amount of containing certain density flue gas in power generation sub-system after boiler combustion, flue gas enters absorption tower after pretreatment unit process at the bottom of tower, the chemical absorbing liquid sprayed with tower top contacts, absorb the carbon dioxide in flue gas, form rich solution, rich solution sprays desorber from tower top and regenerates after rich solution pump and the heat exchange of lean/rich liquid heat exchanger, reboiler provides the heat needed for desorb simultaneously, part water vapour is carried out condensing reflux to desorber through gas-liquid separator by the carbon dioxide separating sucking-off, isolated carbon dioxide stores through the laggard row of overcompression.Separate the lean solution after sucking-off carbon dioxide again spray to absorption tower after lean pump, lean/rich liquid heat exchanger and lean solution condenser and form the circulation of whole absorption and desorption.
Compared with prior art, the invention has the beneficial effects as follows:
(1) by low-temperature heat collection in solar energy and CO
2trapping system combines, and can make full use of the high collection effciency of middle low-temperature solar energy collecting system in collecting regenerated temperature range, to reduce the reduction that conventional power plants extracts the arresting efficiency that high-grade energy causes, improves system synthesis efficiency.
(2) directly utilize middle-low grade heat energy to realize the energy requirement of reboiler, realize the docking of energy grade, the irreversible loss that the steam after avoiding traditional capture method to use cooling decompression in a large number brings, cause the waste of high-grade energy.
(3) reduce original system traditional in prior art to draw gas in a large number the adverse effect of regeneration to steam turbine.
(4) solar energy heating can adapt to the operational mode of power plant well, the energy supply that solar energy realizes trapping system is made full use of by day during peak of power consumption, and night without during solar energy also just low power consumption time, can utilize draws gas provides heat, to maintain operating steadily of power plant.
Accompanying drawing explanation
Fig. 1 is systematic schematic diagram and the structural representation of solar energy auxiliary carbon dioxide of the present invention trapping integrated system embodiment 1;
Fig. 2 is systematic schematic diagram and the structural representation of solar energy auxiliary carbon dioxide of the present invention trapping integrated system embodiment 2.
In figure: 1-power generation sub-system, 2-collecting carbonic anhydride subsystem, 3-solar energy heating subsystem, 4-is to water-to-water heat exchanger, 5-boiler, 6-steam turbine, 7-exhaust steam condenser, 8-Flue Gas Pretreatment Device, 9-absorption tower, 10-rich solution pump, 11-lean solution condenser, the lean/rich liquid heat exchanger of 12-, 13-lean pump, 14-desorber, 15-gas-liquid separator, 16-reboiler, 17-heat collector series, 18-working medium pump, 19-draws gas valve.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail.
A kind of solar energy auxiliary carbon dioxide trapping of the present invention integrated system, as depicted in figs. 1 and 2, comprises power generation sub-system 1, collecting carbonic anhydride subsystem 2 and solar energy heating subsystem 3.
Described power generation sub-system 1 is by water-to-water heat exchanger 4, boiler 5, steam turbine 6 and exhaust steam condenser 7 steam generating system in series.
Described collecting carbonic anhydride subsystem 2 comprises Flue Gas Pretreatment Device 8, absorption tower 9, rich solution pump 10, lean solution condenser 11, lean/rich liquid heat exchanger 12, lean pump 13, desorber 14, gas-liquid separator 15 and reboiler 16; The exhaust opening of described boiler 3 is connected with the entrance of described Flue Gas Pretreatment Device 8, the outlet of described Flue Gas Pretreatment Device 8 connects the gas access of bottom, absorption tower 9, and the flue gas after pretreatment unit 8 desulphurization denitration enters in tower from the bottom on absorption tower 9 and carries out collecting carbonic anhydride; The outlet of described lean solution condenser 11 is connected with the upper liquid spray inlet on described absorption tower 9; Described lean/rich liquid heat exchanger 12 is connected with the entrance of the outlet of described lean pump 13, the rich solution spray inlet on described desorber 14 top, the outlet of described rich solution pump 10 and described lean solution condenser 11 respectively; Entrance bottom described desorber 14 is connected with the outlet of described reboiler 16 and the entrance of described lean pump 13 respectively, and the gas vent at described desorber 14 top is connected to the bottom of described gas-liquid separator 15, as the backflow of condensate liquid.Steam turbine 6 in power generation sub-system 1 according to trapping temperature need therefrom to draw draw gas, therefore, the extraction opening of described steam turbine 6 is connected with the high temperature side entrance of described reboiler 16, the high temperature side outlet of described reboiler 16 is connected with described exhaust steam condenser 7, to maintain the water balance in power generation sub-system; Connecting line between described steam turbine 6 and described reboiler 16 is provided with the valve 19 that draws gas.
Described solar energy heating subsystem 3 is composed in series by solar thermal collector series 17 and working medium pump 18.
In the present invention, different according to the heat-collecting temperature that solar energy heating subsystem 1 designs, solar energy heating subsystem 3 has two kinds with the annexation of power generation sub-system 1 and collecting carbonic anhydride subsystem 2.
Embodiment 1:
When the heat-collecting temperature of solar energy heating subsystem 3 is middle temperature, its annexation is: as shown in Figure 1, sender property outlet end in described solar energy heating subsystem 3 is connected with the high temperature side entrance of water-to-water heat exchanger 4 of giving in power generation sub-system 1, in utilization, high temperature solar heat collecting heating replaces steam-extracting type feedwater heating, described outlet to the high temperature side of water-to-water heat exchanger 4 is connected with the high temperature side entrance of the reboiler 16 in described carbon dioxide capture system 2 again, the high temperature side outlet of described reboiler 16 is connected with the working medium arrival end of described solar energy heating subsystem 3, thus form solar energy heating circulation.The connected mode of embodiment 1 can by solar energy heating subsystem thermal-arrest to high-temperature in about 200-350 DEG C, steam power plant's feed temperature is added by heat exchanger, heat exchange is proceeded through reboiler again after heat exchange, to provide the heat of reboiler, and the insufficient section of reboiler institute calorific requirement is provided by the steam extracting steam turbine low-temp low-pressure again, such formation solar energy heating circulation, achieves the cascade utilization of energy grade, reduces the irreversible loss of system.
Embodiment 2:
The sender property outlet end of described solar energy heating subsystem 3 is connected with the high temperature side arrival end of the reboiler 16 in described collecting carbonic anhydride subsystem 2, the high temperature side outlet of described reboiler 16 is connected with the working medium arrival end of described solar energy heating subsystem 3, forms solar energy heating circulation.The connected mode of embodiment 2 can directly utilize solar energy heating subsystem to be utilized to the temperature range supply reboiler needed for reboiler by the working fluid thermal-arrest in solar thermal collector series, while simplification system, also take full advantage of solar thermal collection system collecting efficiency higher at low temperatures, decrease working fluid radiation loss at high temperature.
To sum up, heat output for solar energy heating subsystem passes through to adopt different connected modes, the height of the energy requirement grade of associated components between solar energy heating and power generation sub-system and collecting carbonic anhydride subsystem is carried out rational distribution and integrated, achieve the cascade utilization of energy, significantly can reduce the energy consumption of steam pumping from power plant steam turbine, the double effects of renewable energy utilization and power plant's carbon dioxide discharge-reduction is realized, the strong large-scale application promoting China's solar energy and flue gas trapping integrated technology while maintaining power plant's stability.
In the solar energy auxiliary carbon dioxide trapping integrated system course of work of the present invention, drawn gas by solar energy and steam turbine 6 and jointly complete the heat demand of reboiler 16, the valve 19 that draws gas is closed when the heat that solar energy is supplied to reboiler 16 is sufficient, trapping system desorb energy consumption is provided completely by solar energy, then open when solar energy is not enough the valve 19 that draws gas, utilize solar energy and extracted steam from turbine to provide reboiler heat demand simultaneously.
Power generation sub-system described in the present invention and conventional power generation systems similar, just add on the basis of conventional power plants utilize solar energy give water-to-water heat exchanger 4, can switch utilizing solar energy and do not utilize between solar energy heating boiler feedwater, introduce reboiler bleeding cycle pipeline simultaneously, increase valve and controlled.
The subsystem of collecting carbonic anhydride described in the present invention 2 is mainly applicable to the chemical absorbent aqueous solution based on alcamines material, namely can be the absorbent solution that single chemical absorbing material is made into, also can be the composite absorber of number of chemical absorbing material proportioning composition.Adsorbent used in the present invention belongs to the mature technology in this area, and its formula and preparation technology do not repeat them here.
In described solar energy heating subsystem 3, the selection form of heat collector series 17 can be the forms such as compound parabolic concentrating collector (CPC), groove type heat collector, Fresnel heat collector, dish-style heat collector and tower-type heat collector.
In described solar energy heating subsystem 3, circulation of fluid generally adopts high temperature heat conductive oil as heat transfer medium, in addition, also fuse salt or water can be used as heat transfer medium, be that medium need, through one-level heat exchange, then only need when taking water as heat transferring medium directly be connected with reboiler when being connected with reboiler with conduction oil.
Although invention has been described for composition graphs above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (4)
1. a solar energy auxiliary carbon dioxide trapping integrated system, comprises power generation sub-system (1), collecting carbonic anhydride subsystem (2), solar energy heating subsystem (3); It is characterized in that:
Described power generation sub-system (1) is by water-to-water heat exchanger (4), boiler (5), steam turbine (6) and exhaust steam condenser (7) steam generating system in series;
Described collecting carbonic anhydride subsystem (2) comprises Flue Gas Pretreatment Device (8), absorption tower (9), rich solution pump (10), lean solution condenser (11), lean/rich liquid heat exchanger (12), lean pump (13), desorber (14), gas-liquid separator (15) and reboiler (16);
The exhaust opening of described boiler (5) is connected with the entrance of described Flue Gas Pretreatment Device (8), and the outlet of described Flue Gas Pretreatment Device (8) connects the gas access of absorption tower (9) bottom;
The outlet of described lean solution condenser (11) is connected with the upper liquid spray inlet of described absorption tower (9);
Described lean/rich liquid heat exchanger (12) is connected with the entrance of the rich solution spray inlet on the outlet of described lean pump (13), described desorber (14) top, the outlet of described rich solution pump (10) and described lean solution condenser (11) respectively;
The entrance of described desorber (14) bottom is connected with the outlet of described reboiler (16) and the entrance of described lean pump (13) respectively, the gas vent at described desorber (14) top is connected to the bottom of described gas-liquid separator (15), as the backflow of condensate liquid;
The extraction opening of described steam turbine (6) is connected with the high temperature side entrance of described reboiler (16), and the high temperature side outlet of described reboiler (16) is connected with described exhaust steam condenser (7);
Connecting line between described steam turbine (6) and described reboiler (16) is provided with the valve that draws gas (19);
Described solar energy heating subsystem (3) is composed in series by solar thermal collector series (17) and working medium pump (18), the heat output of described solar energy heating subsystem (3) with the annexation between described reboiler (16) is: the sender property outlet end in described solar energy heating subsystem (3) is connected with the described high temperature side entrance of water-to-water heat exchanger (4) of giving, described outlet to the high temperature side of water-to-water heat exchanger (4) is connected with the high temperature side entrance of described reboiler (16), the high temperature side outlet of described reboiler (16) is connected with the working medium arrival end of described solar energy heating subsystem (3).
2. solar energy auxiliary carbon dioxide trapping integrated system according to claim 1, it is characterized in that, absorbent in described collecting carbonic anhydride subsystem is the chemical absorbent aqueous solution based on alcamines material, and described absorbent is the absorbent solution that single chemical absorbing material is made into or the composite absorber be made up of number of chemical absorbing material proportioning.
3. solar energy auxiliary carbon dioxide trapping integrated system according to claim 1, it is characterized in that, described solar thermal collector series is a kind of or several combination in compound parabolic concentrating collector, groove type heat collector, Fresnel heat collector, dish-style heat collector and tower-type heat collector.
4. solar energy auxiliary carbon dioxide trapping integrated system according to claim 1, it is characterized in that, the heat transfer medium of described solar energy heating subsystem selects the one in conduction oil, fuse salt and water.
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| CN104613654B (en) * | 2015-01-13 | 2017-02-01 | 宁波瑞信能源科技有限公司 | Combined-type-solar-system power-plant water-feeding and CO2-collecting assisted integrated system |
| CN104607001A (en) * | 2015-01-13 | 2015-05-13 | 宁波瑞信能源科技有限公司 | Solar gradient phase change heat storage indirect steam assisted carbon dioxide capture system |
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| CN107744722A (en) * | 2017-11-14 | 2018-03-02 | 西安交通大学 | Collecting carbonic anhydride and recycling system and method based on Driven by Solar Energy |
| CN108508748B (en) * | 2018-03-28 | 2020-11-03 | 东南大学 | Effective operation control method for photo-thermal auxiliary combustion post-CO 2 capture system |
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| CN112126477A (en) * | 2020-09-17 | 2020-12-25 | 安徽工业大学 | Carbon dioxide capture system and method based on blast furnace slag washing water waste heat recycling |
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