CN104785073A - Carbon dioxide capture, power generation and sequestration system utilizing terrestrial heat - Google Patents
Carbon dioxide capture, power generation and sequestration system utilizing terrestrial heat Download PDFInfo
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- CN104785073A CN104785073A CN201510216551.6A CN201510216551A CN104785073A CN 104785073 A CN104785073 A CN 104785073A CN 201510216551 A CN201510216551 A CN 201510216551A CN 104785073 A CN104785073 A CN 104785073A
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Abstract
The invention discloses a carbon dioxide capture, power generation and sequestration system utilizing terrestrial heat. According to the system, a lean-solution and rich-solution heat exchanger of an absorption tower is communicated with a regeneration tower, and the regeneration tower is communicated with the absorption tower through the lean-solution and rich-solution heat exchanger; a re-boiler at the bottom of the regeneration tower is communicated with a low-pressure steam and a CO2 expander; the regeneration tower is communicated with a condenser, the condenser is communicated with the re-boiler and a CO2 cooler, the CO2 cooler is communicated with a compressor, and the compressor is connected to a terrestrial heat layer; the re-boiler is communicated with the CO2 expander, the CO2 expander is communicated with the carbon dioxide ejected by the terrestrial heat layer, and the power generated by a CO2 power generator is conveyed to a power grid. According to the system disclosed by the invention, a part of the carbon dioxide is permanently sequestrated underground, the other part of the carbon dioxide is heated and pressurized in the terrestrial heat layer, and then conveyed to the ground through a pipeline, and converted to a mechanical energy in the carbon dioxide expander to drive the carbon dioxide power generator to generate power; the expanded carbon dioxide can be used for rich solution desorption in a capture section, the clean power is generated by virtue of terrestrial heat resources while the emission of greenhouse gases are slowed down, and the system has economic benefits.
Description
Technical field
The invention belongs to collecting carbonic anhydride, utilize and Plugging Technology Applied field, be particularly useful for low concentration CO in the flue gas of the generation such as coal-burning boiler, gas turbine
2trapping, and utilize geother-mal power generation while by carbon dioxide sequestration underground, particularly a kind ofly utilize the collecting carbonic anhydride of underground heat, generate electricity and the system of sealing up for safekeeping.
Background technology
Climate change is one of the most great survival and development problem of facing mankind in this century.Mankind's activity since the industrial revolution, especially the discharge of developed country's a large amount of greenhouse gases in course of industrialization, cause global climate immediate and mid-term to warm as the marked change of principal character, obvious impact is created on global natural ecosystems, serious challenge is brought to the survival and development of human society, and the carbon dioxide of industrial discharge is considered to the one of the main reasons causing climate warming, for avoiding causing irreversible adverse effect to weather system, must adopt an effective measure and reduce and control generation and the discharge of carbon dioxide, the carbon dioxide sequestration maybe will produced.
Correlative study shows, the CO2 emission of China more than 50% comes from the thermal power generation of coal-burning power plant.Coal-fired plant flue gas discharge capacity is large, and Relatively centralized, the carbon trapping technique based on coal-burning power plant's exploitation is one of important channel of carbon dioxide discharge-reduction.In traditional carbon dioxide geologic sequestration technology, a kind of is by the CO under supercriticality
2the water-bearing layer that press-in underground 800m is dark, utilizes the cap rock layer preventing gas and liquid from permeating to storage layer top, can by CO
2be sealed in underground for a long time, stably, this kind of method cost of investment is high, and without any economic well-being of workers and staff; The another kind of processing mode associated with geological storage is CO
2recycling.CO
2recycling usually have two kinds of modes, one is that coal gas layer is sealed up for safekeeping, refer in the middle of coal seam deep for carbon dioxide injection, displace the coal bed gas containing methane, so this technology has certain economy, but must be selected in darker coal seam, to ensure to cause leakage because of exploitation, problem is that carbon dioxide melts swollen reaction after entering coal gas layer, causes the space of coal gas layer to diminish, injecting carbon dioxide can be more and more difficult, again cannot inject gradually; Another kind is then by CO
2inject just close to exhausted oil field to improve oil recovery, this project plan comparison is attractive, because of its can from the oil additionally exploited partial-compensation CO
2storage cost, but shortcoming to be the geographical distribution in this kind of oil field uneven, and Exploitation Potential is limited.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide and a kind ofly utilize the collecting carbonic anhydride of underground heat, generating electricity and the system of sealing up for safekeeping, this system can be used for low concentration CO in the flue gas that coal-burning boiler, gas turbine etc. produce
2trapping, and again trapped carbon dioxide sequestration is utilized geothermal energy while underground, utilize carbon dioxide as generating working medium, a part of regenerated heat of carbon dioxide capture system is provided simultaneously, this system can not only reduce collecting carbonic anhydride energy consumption, can realize again sealing up for safekeeping and utilizing integration, and produce certain economic benefit, reduce by the great number cost sealing generation up for safekeeping.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind ofly utilize the collecting carbonic anhydride of underground heat, generate electricity and the system of sealing up for safekeeping, comprise absorption tower 2, rich solution outlet bottom absorption tower 2 is through poor rich liquid heat exchanger 3 and regenerator 4 upper end rich solution inlet communication, and the lean solution outlet bottom regenerator 4 is communicated with packing section on absorption tower 2 through poor rich liquid heat exchanger 3;
Be provided with reboiler 10 bottom described regenerator 4, the thermal source of reboiler 10 is provided by two-way, and a steam inlet, road is communicated with the low-pressure steam from steam pipe system, another road and CO
2the carbon dioxide gas outlet of decompressor 8 is communicated with;
The CO at described regenerator 4 top
2gas vent is communicated with condenser 5 upper end gas feed, and condenser 5 lower end is communicated with regenerator 4 upper end condensate liquid reflux inlet, the CO at condenser 5 top
2gas after being communicated with reboiler 10 carbon dioxide gas outlet again with CO
2cooler 6 entrance is communicated with, CO
2cooler 6 exports and compressor 7 inlet communication, and compressor 7 outlet is connected to geothermal layer;
Described reboiler 10 carbon dioxide entrance and CO
2decompressor 8 gas vent is communicated with, CO
2the carbon dioxide that decompressor 8 gas access and geothermal layer spray is communicated with, CO
2decompressor 8 axle head and CO
2generator 9 is communicated with, CO
2the electric power that generator 9 produces is sent to electrical network.
Described CO
2decompressor 8 is piston type or turbo-expander.
Described reboiler 10 is provided with two-way thermal source, and the carbon dioxide after steam and expansion power generation, is used alone or uses simultaneously.
Compared with prior art, the present invention by collecting carbonic anhydride, seal up for safekeeping and combine with utilization, be compressed in the process of geothermal layer at the carbon dioxide trapped from flue gas, understand some carbon dioxide progressively permeate and be stored in underground, remaining carbon dioxide is heated it by geothermal energy, and the carbon dioxide after heating is pumped to CO
2thermal energy is that mechanical energy drives CO by decompressor
2generator produces electric power, and the carbon dioxide after once discharging heat energy is used further to the rich solution desorb trapping workshop section, greatly reduces energy consumption and the cost of chemical carbon rejection processes.The method, while slowing down greenhouse gas emission, solving climate change problem, can also utilize geothermal energy resources to produce the clean charged power of base, produce certain economic benefit, and naturally combines together.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
With reference to accompanying drawing, a kind ofly utilize the collecting carbonic anhydride of underground heat, generate electricity and the system of sealing up for safekeeping, comprise the absorption tower 2 be communicated with flue gas flow control valve 1, rich solution outlet bottom absorption tower 2 is through poor rich liquid heat exchanger 3 and regenerator 4 upper end rich solution inlet communication, and the lean solution outlet bottom regenerator 4 is communicated with packing section on absorption tower 2 through poor rich liquid heat exchanger 3;
Be provided with reboiler 10 bottom described regenerator 4, the thermal source of reboiler 10 is provided by two-way, and a steam inlet, road is communicated with the low-pressure steam from steam pipe system, another road and CO
2the carbon dioxide gas outlet of decompressor 8 is communicated with;
The CO at described regenerator 4 top
2gas vent is communicated with condenser 5 upper end gas feed, and condenser 5 lower end is communicated with regenerator 4 upper end condensate liquid reflux inlet, the CO at condenser 5 top
2gas after being communicated with reboiler 10 carbon dioxide gas outlet again with CO
2cooler 6 entrance is communicated with, CO
2cooler 6 exports and compressor 7 inlet communication, and compressor 7 outlet is connected to geothermal layer;
Described reboiler 10 carbon dioxide entrance and CO
2decompressor 8 gas vent is communicated with, CO
2the carbon dioxide that decompressor 8 gas access and geothermal layer spray is communicated with, CO
2decompressor 8 axle head and CO
2generator 9 is communicated with, CO
2the electric power that generator 9 produces is sent to electrical network.
Described CO
2decompressor 8 is piston type or turbo-expander.
Described reboiler 10 is provided with two-way thermal source, and the carbon dioxide after steam and expansion power generation, is used alone or uses simultaneously.
Described condenser 5 is the container that can realize steam-condensation and gas-liquid separation.
Technical process of the present invention and principle are:
Neat stress after desulphurization denitration enters absorption tower 2 by flue gas flow control valve 1 adjust flux, flue gas and spray and under absorbent form counter current contacting, the rich solution absorbing carbon dioxide enters regenerator 4 upper end packing layer deliver to poor rich liquid heat exchanger 3 and lean solution heat exchange bottom absorption tower 2 after and carries out desorption and regeneration.
Lean solution bottom regenerator 4 is gone to after poor rich liquid heat exchanger 3 reclaims heat with rich solution heat exchange, delivers to packing section upper end, absorption tower 2, carries out carbon dioxide absorption.
The regenerating carbon dioxide gas at regenerator 4 top is after condenser 5 gas-water separation, aqueous water is recycled to regenerator 4 upper end bottom condenser 5, the carbon dioxide of regeneration and the outlet of reboiler 10 carbon dioxide heat source side, mixed carbon dioxide is through CO
2cooler 6 cools and is depressed into underground geothermal tomography through compressor 7 again, CO
2heated by deep geothermal heat, reach ultra supercritical state.Beat a bite vertical shaft at tomography far-end, be subject to the CO of powerful extruding in underground
2eruption that can be fierce out, and carries huge energy.This energy is utilized to make CO
2decompressor 8 does work and drives CO
2generator 9 generates electricity.
The reboiler 10 arranged bottom regenerator 4 has two-way thermal source, and preferentially using can rear CO in once release
2the outlet source of the gas of decompressor 8, secondly uses the low-pressure steam thermal source from pipe network.The carbon dioxide and the regeneration gas that again discharge interior energy are together delivered to underground heating by compressor 7, reciprocation cycle again.
During system for geothermal production of electricity runs, some carbon dioxide injected is can penetrate into stratum by during bottom interstitial space, and namely this part carbon dioxide is sealed up for safekeeping in underground, and the carbon dioxide of loss supplements by the carbon dioxide newly trapped from flue gas.
Claims (3)
1. one kind utilizes the collecting carbonic anhydride of underground heat, generates electricity and the system of sealing up for safekeeping, comprise absorption tower (2), it is characterized in that, the rich solution outlet of bottom, absorption tower (2) is through poor rich liquid heat exchanger (3) and regenerator (4) upper end rich solution inlet communication, and the lean solution outlet of regenerator (4) bottom is communicated with through the upper packing section in poor rich liquid heat exchanger (3) and absorption tower (2);
Described regenerator (4) bottom is provided with reboiler (10), and the thermal source of reboiler (10) is provided by two-way, and a steam inlet, road is communicated with the low-pressure steam from steam pipe system, another road and CO
2the carbon dioxide gas outlet of decompressor (8) is communicated with;
The CO at described regenerator (4) top
2gas vent is communicated with condenser (5) upper end gas feed, and condenser (5) lower end is communicated with regenerator (4) upper end condensate liquid reflux inlet, the CO at condenser (5) top
2gas after being communicated with reboiler (10) carbon dioxide gas outlet again with CO
2cooler (6) entrance is communicated with, CO
2cooler 6 exports and compressor (7) inlet communication, and compressor (7) outlet is connected to geothermal layer;
Described reboiler 10 carbon dioxide entrance and CO
2decompressor 8 gas vent is communicated with, CO
2the carbon dioxide that decompressor (8) gas access and geothermal layer spray is communicated with, CO
2decompressor (8) axle head and CO
2generator (9) is communicated with, CO
2the electric power that generator (9) produces is sent to electrical network.
2. according to claim 1ly a kind ofly utilize the collecting carbonic anhydride of underground heat, generate electricity and the system of sealing up for safekeeping, it is characterized in that, described CO
2decompressor (8) is piston type or turbo-expander.
3. according to claim 1ly a kind ofly utilize the collecting carbonic anhydride of underground heat, generate electricity and the system of sealing up for safekeeping, it is characterized in that, described reboiler (10) is provided with two-way thermal source, and the carbon dioxide after steam and expansion power generation, is used alone or uses simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510216551.6A CN104785073A (en) | 2015-04-30 | 2015-04-30 | Carbon dioxide capture, power generation and sequestration system utilizing terrestrial heat |
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|---|---|---|---|
| CN201510216551.6A CN104785073A (en) | 2015-04-30 | 2015-04-30 | Carbon dioxide capture, power generation and sequestration system utilizing terrestrial heat |
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| CN104785073A true CN104785073A (en) | 2015-07-22 |
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Cited By (5)
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| CN105561742A (en) * | 2016-02-19 | 2016-05-11 | 天津大学 | Carbon dioxide capture system assisted by combination of solar energy and geothermal energy |
| CN106587062A (en) * | 2016-11-22 | 2017-04-26 | 中盈长江国际新能源投资有限公司 | Carbon dioxide capturing and storing method and system for collecting geothermal energy to supply heat |
| WO2019071526A1 (en) * | 2017-10-12 | 2019-04-18 | 彭斯干 | Zero-carbon emission fossil fuel power generation method and apparatus system |
| CN115178090A (en) * | 2022-08-19 | 2022-10-14 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired flue gas treatment system and method |
| CN117959872A (en) * | 2024-03-28 | 2024-05-03 | 数皮科技(湖北)有限公司 | Carbon dioxide sealing system in geothermal energy heat supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105561742A (en) * | 2016-02-19 | 2016-05-11 | 天津大学 | Carbon dioxide capture system assisted by combination of solar energy and geothermal energy |
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| WO2019071526A1 (en) * | 2017-10-12 | 2019-04-18 | 彭斯干 | Zero-carbon emission fossil fuel power generation method and apparatus system |
| CN115178090A (en) * | 2022-08-19 | 2022-10-14 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired flue gas treatment system and method |
| CN117959872A (en) * | 2024-03-28 | 2024-05-03 | 数皮科技(湖北)有限公司 | Carbon dioxide sealing system in geothermal energy heat supply |
| CN117959872B (en) * | 2024-03-28 | 2024-06-07 | 数皮科技(湖北)有限公司 | Carbon dioxide sealing system in geothermal energy heat supply |
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Application publication date: 20150722 |