CN116136213A - Method for capturing carbon dioxide under critical conditions - Google Patents
Method for capturing carbon dioxide under critical conditions Download PDFInfo
- Publication number
- CN116136213A CN116136213A CN202111361026.5A CN202111361026A CN116136213A CN 116136213 A CN116136213 A CN 116136213A CN 202111361026 A CN202111361026 A CN 202111361026A CN 116136213 A CN116136213 A CN 116136213A
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- Prior art keywords
- carbon dioxide
- gas
- liquid
- supercharger
- heat exchange
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a method for capturing carbon dioxide by utilizing critical conditions, which comprises the following steps: the gas containing carbon dioxide passes through a supercharger and a heat exchange device to reach the critical temperature and pressure of carbon dioxide liquefaction, so as to obtain a gas-liquid mixture, the gas-liquid mixture separates liquid carbon dioxide from compressed gas through a liquid-gas separator, and the compressed gas separated from the liquid-gas separator is conveyed to a turbine in linkage with the supercharger after passing through the heat exchange device. When the method utilizes critical conditions to capture carbon dioxide, the energy of the separated high-pressure gas is fully utilized to drive the turbine connected with the supercharger, so that the energy consumption of the supercharger is reduced, the carbon dioxide capture cost is greatly reduced, and conditions are provided for the geological sequestration commercialization of carbon dioxide.
Description
Technical Field
The invention relates to a method for capturing carbon dioxide by utilizing critical conditions, which utilizes pressurized carbon dioxide-containing gas to reach a critical state, then utilizes a liquid-gas separator to separate liquid carbon dioxide from compressed gas with little carbon dioxide content, and conveys the compressed gas to a turbine in linkage with a supercharger to reduce energy consumption of the supercharger, and belongs to the field of energy conservation and emission reduction.
Background
The bottoming technology for achieving the targets of carbon peak of 30 years and carbon neutralization of 60 years is carbon dioxide geological sequestration, but the high carbon dioxide capture cost restricts the commercial operation of carbon dioxide geological sequestration. By utilizing the characteristic of the critical state of carbon dioxide (the critical temperature of pure carbon dioxide is 31 degrees and the pressure is 7.4 MPa), the industrial exhaust gas or air is pressurized to the critical temperature and pressure to liquefy the carbon dioxide, and the carbon dioxide is collected by utilizing the liquid-gas separation technology, so that the method is a method for capturing the carbon dioxide, but the compression cost is high and is a main bottleneck of the technology.
According to the invention, the supercharger is used for compressing industrial exhaust gas or air, the heat exchange and heat storage device is used for collecting gas heat and reducing the temperature of the gas heat, so that the gas heat is in a carbon dioxide critical state, the liquid gas device is used for separating compressed gas and liquid carbon dioxide, and then the separated compressed gas is heated by the heat exchange and heat storage device and then is introduced into the turbine in linkage with the supercharger, so that the energy consumption of the supercharger is reduced, the carbon dioxide capturing cost is greatly reduced, and conditions are provided for geological carbon dioxide storage commercialization.
Disclosure of Invention
In order to solve the problem of high cost of capturing carbon dioxide by utilizing a carbon dioxide critical state, the invention utilizes a supercharger to compress gas (air or industrial exhaust gas) to be larger than the critical pressure of the carbon dioxide, utilizes a heat exchange and heat storage technology to reduce the pressurized high-temperature gas to be lower than the critical temperature, can liquefy the carbon dioxide in the gas, then utilizes a liquid-gas separator to separate out the compressed gas with low carbon dioxide and carbon dioxide content, and the compressed gas is heated by the heat exchange and heat storage device and then is used for pushing a turbine which is in linkage with the supercharger, so that the power consumption of the supercharger is reduced.
The technical scheme adopted for solving the technical problems is as follows: industrial exhaust gas or air enters a compressor (2) from an inlet (1), is pressurized to be higher than the critical pressure of carbon dioxide, then enters a heat exchange and heat storage device (3) to reach the critical condition of carbon dioxide, carbon dioxide liquid and gas mixed phase enters a liquid-gas separator (4), liquid carbon dioxide separated by the liquid-gas separator enters a carbon dioxide container, compressed gas separated by the liquid-gas separator enters the heat exchange and heat storage device (3) to be heated, then enters a turbine (5) to push the turbine (5) to rotate, and power is transmitted to a supercharger (2) linked with the turbine (5).
The technical scheme adopted for solving the technical problems is as follows: a method for capturing carbon dioxide by utilizing critical conditions is characterized in that: the gas containing carbon dioxide passes through a supercharger and a heat exchange device to reach the critical temperature and pressure of carbon dioxide liquefaction, so as to obtain a gas-liquid mixture, the gas-liquid mixture separates liquid carbon dioxide from compressed gas through a liquid-gas separator, and the compressed gas separated from the liquid-gas separator is conveyed to a turbine in linkage with the supercharger after passing through the heat exchange device.
In some preferred embodiments of the invention, the heat exchange device is a heat exchange and storage device.
In some preferred embodiments of the invention, the heat exchange device is a common pipeline.
The invention has the beneficial effects that when the critical condition is utilized to capture carbon dioxide, the energy of the separated high-pressure gas is fully utilized to drive the turbine connected with the supercharger, so that the energy consumption of the supercharger is reduced, the carbon dioxide capture cost is greatly reduced, and the condition is provided for commercialization of carbon dioxide geological storage.
Drawings
FIG. 1 is a schematic diagram of a method for capturing carbon dioxide using critical conditions.
Reference numerals illustrate: 1. an industrial exhaust gas or air inlet, a compressor, a heat exchange and energy storage device, a liquid-gas separator, a turbine, a carbon dioxide container and compressed air.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the following description.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products available commercially without the manufacturer's knowledge.
Example 1
The industrial exhaust gas with the carbon dioxide content of about 15 volume percent enters a compressor (2) from an inlet (1), is pressurized to the critical pressure of the carbon dioxide, enters a heat exchange and heat storage device (3), is cooled, reaches the critical condition of the carbon dioxide, enters a liquid-gas separator (4) from a mixed phase of the carbon dioxide liquid and the gas, enters a carbon dioxide container from the liquid-gas separator (4), and enters a turbine (5) linked with a supercharger after the compressed gas separated from the liquid-gas separator (4) enters the heat exchange and heat storage device (3) for heating.
Example 2
The industrial exhaust gas with the carbon dioxide content of about 15 volume percent enters a compressor (2) from an inlet (1), is pressurized to the critical pressure of the carbon dioxide, enters a heat exchange and heat storage device (3), is cooled to reach the critical condition of the carbon dioxide, a mixed phase of carbon dioxide liquid and gas enters a liquid-gas separator (4), liquid carbon dioxide separated by the liquid-gas separator (4) enters a carbon dioxide container, and compressed gas separated by the liquid-gas separator (4) enters a turbine (5) linked with the supercharger.
Example 3
The industrial exhaust gas with the carbon dioxide content of about 15 volume percent enters a compressor (2) from an inlet (1) to be pressurized, the mixed phase of carbon dioxide liquid and gas enters a liquid-gas separator (4), liquid carbon dioxide separated by the liquid-gas separator (4) enters a carbon dioxide container, and compressed gas separated by the liquid-gas separator (4) enters a turbine (5) linked with a booster.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (3)
1. A method for capturing carbon dioxide by utilizing critical conditions is characterized in that: the gas containing carbon dioxide passes through a supercharger and a heat exchange device to reach the critical temperature and pressure of carbon dioxide liquefaction, so as to obtain a gas-liquid mixture, the gas-liquid mixture separates liquid carbon dioxide from compressed gas through a liquid-gas separator, and the compressed gas separated from the liquid-gas separator is conveyed to a turbine in linkage with the supercharger after passing through the heat exchange device.
2. The method for capturing carbon dioxide using critical conditions according to claim 1, wherein: the heat exchange device is a heat exchange and storage device.
3. The method for capturing carbon dioxide using critical conditions according to claim 1, wherein: the heat exchange device is a common pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111361026.5A CN116136213A (en) | 2021-11-17 | 2021-11-17 | Method for capturing carbon dioxide under critical conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111361026.5A CN116136213A (en) | 2021-11-17 | 2021-11-17 | Method for capturing carbon dioxide under critical conditions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116136213A true CN116136213A (en) | 2023-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111361026.5A Pending CN116136213A (en) | 2021-11-17 | 2021-11-17 | Method for capturing carbon dioxide under critical conditions |
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| CN (1) | CN116136213A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107081045A (en) * | 2017-04-14 | 2017-08-22 | 中国石油化工股份有限公司 | The method and its special equipment of a kind of collecting carbon dioxide from fuel gas |
| CN107569981A (en) * | 2017-10-11 | 2018-01-12 | 杨正山 | A kind of coal-burning power plant's flue gas collecting carbonic anhydride coupled biological charcoal preparation technology |
| CN209093018U (en) * | 2018-10-19 | 2019-07-12 | 中国科学院工程热物理研究所 | A low-energy carbon dioxide capture and storage system |
| CN113061475A (en) * | 2021-03-10 | 2021-07-02 | 广西大学 | Liquefaction process method and device for separating carbon dioxide from critical biogas by adjusting concentration of carbon dioxide |
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2021
- 2021-11-17 CN CN202111361026.5A patent/CN116136213A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107081045A (en) * | 2017-04-14 | 2017-08-22 | 中国石油化工股份有限公司 | The method and its special equipment of a kind of collecting carbon dioxide from fuel gas |
| CN107569981A (en) * | 2017-10-11 | 2018-01-12 | 杨正山 | A kind of coal-burning power plant's flue gas collecting carbonic anhydride coupled biological charcoal preparation technology |
| CN209093018U (en) * | 2018-10-19 | 2019-07-12 | 中国科学院工程热物理研究所 | A low-energy carbon dioxide capture and storage system |
| CN113061475A (en) * | 2021-03-10 | 2021-07-02 | 广西大学 | Liquefaction process method and device for separating carbon dioxide from critical biogas by adjusting concentration of carbon dioxide |
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