CN209908583U - Supercritical carbon dioxide Brayton cycle working medium purification system - Google Patents
Supercritical carbon dioxide Brayton cycle working medium purification system Download PDFInfo
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- CN209908583U CN209908583U CN201920784420.1U CN201920784420U CN209908583U CN 209908583 U CN209908583 U CN 209908583U CN 201920784420 U CN201920784420 U CN 201920784420U CN 209908583 U CN209908583 U CN 209908583U
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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
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The utility model discloses a supercritical carbon dioxide brayton cycle working medium clean system, including supercritical brayton cycle system, first air-vent valve, second air-vent valve and membrane separator, wherein, the export of main compressor is linked together through first air-vent valve and membrane separator's entry in the supercritical brayton cycle system, membrane separator's impurity gas export is divided into two the tunnel, discharge wherein all the way, another way is linked together with the one end of second air-vent valve after passing through pipeline and pipe with membrane separator's carbon dioxide export, the other end of second air-vent valve is linked together with the heat absorption side entry of low temperature regenerator in the supercritical brayton cycle system, this system realizes the continuous purification of supercritical carbon dioxide brayton cycle working medium.
Description
Technical Field
The utility model relates to a working medium clean system, concretely relates to supercritical carbon dioxide brayton cycle working medium clean system.
Background
Under the large background of energy shortage and environmental crisis, increasing attention is paid to improving energy utilization rate. The supercritical brayton cycle is currently the most advantageous form of cycle among the many thermodynamic cycles. The novel supercritical working medium carbon dioxide has the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduces the equipment volume and has very high economical efficiency.
However, there are some differences in this type of cycle compared to a conventional rankine cycle. The supercritical carbon dioxide Brayton cycle adopts carbon dioxide as work instead of water, the using amount of the carbon dioxide in a circulating system is large, the purity requirement is high, and a certain initial investment is required when industrial-grade carbon dioxide is generally used. However, for large industrial-grade systems, it is difficult to maintain the purity of carbon dioxide in the system high for a long time without mixing or remaining other impurity gases, and therefore, it is necessary to continuously purify carbon dioxide in the system for a long time to ensure the purity of carbon dioxide, thereby ensuring the performance of the system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a supercritical carbon dioxide brayton cycle working medium clean system, this system realizes the continuous purification of supercritical carbon dioxide brayton cycle working medium.
In order to achieve the above object, the supercritical carbon dioxide brayton cycle working medium purification system include supercritical brayton cycle system, first air-vent valve, second air-vent valve and membrane separation device, wherein, the export of main compressor is linked together through first air-vent valve and membrane separation device's entry among the supercritical brayton cycle system, membrane separation device's impurity gas export is divided into two the tunnel, discharge wherein all the way, another way is linked together with the one end of second air-vent valve after passing through pipeline and pipe with membrane separation device's carbon dioxide export, the other end of second air-vent valve is linked together with the heat absorption side entry of low temperature regenerator in the supercritical brayton cycle system.
The supercritical Brayton cycle system comprises a turbine, a high-temperature heat regenerator, a low-temperature heat regenerator, a precooler, a main compressor and a recompressor;
the inlet of the turbine is communicated with the working medium side outlet of the heat source, the outlet of the turbine is communicated with the heat-releasing side inlet of the high-temperature heat regenerator, the heat-releasing side outlet of the high-temperature heat regenerator is communicated with the heat-releasing side inlet of the low-temperature heat regenerator, the heat-releasing side outlet of the low-temperature heat regenerator is divided into two paths, one path is communicated with the working medium side inlet of the precooler, the other path is communicated with the inlet of the recompressor, the working medium side outlet of the precooler is communicated with the inlet of the main compressor, the heat-absorbing side outlet of the low-temperature heat regenerator and the outlet of the recompressor are communicated with the heat-absorbing side inlet of the high-temperature heat regenerator after being.
The device also comprises a working medium supplementing system, wherein the working medium supplementing system is communicated with the inlet of the precooler.
The working medium supplementing system comprises a carbon dioxide liquid storage tank, a carbon dioxide booster pump and a carbon dioxide evaporator, wherein an outlet of the carbon dioxide liquid storage tank is communicated with an inlet of the precooler through the carbon dioxide booster pump and the carbon dioxide evaporator in sequence.
The heat source is a boiler, a waste heat exchanger or a solar heat collecting system.
The utility model discloses following beneficial effect has:
supercritical carbon dioxide brayton cycle working medium clean system when concrete operation, supercritical carbon dioxide working medium of main compressor output in the supercritical brayton cycle system enters into membrane separator after first air-vent valve pressure regulating and classifies, wherein, the impure gas of membrane separator output divide into two the tunnel, wherein discharge all the way, another way carries out the pressure regulating through the second air-vent valve after converging with the pure carbon dioxide working medium of membrane separator output, then enter into in the heat absorption side of low temperature regenerator in the supercritical brayton cycle system, in order to realize the continuous purification of supercritical carbon dioxide brayton cycle working medium, and furthest's the consumption that reduces carbon dioxide emission and pure carbon dioxide gas, reduce the investment.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a heat source, 2 is a supercritical Brayton cycle system, 3 is a purification system, 4 is a working medium supplement system, 21 is a turbine, 22 is a high-temperature regenerator, 23 is a low-temperature regenerator, 24 is a precooler, 25 is a main compressor, 26 is a recompressor, 31 is a first pressure regulating valve, 32 is a membrane separation device, 33 is a second pressure regulating valve, 41 is a carbon dioxide liquid storage tank, 42 is a carbon dioxide booster pump, and 43 is a carbon dioxide evaporator.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the supercritical carbon dioxide brayton cycle working medium purification system includes supercritical brayton cycle system 2, first air-vent valve 31, second air-vent valve 33 and membrane separation device 32, wherein, the export of main compressor 25 is linked together through the entry of first air-vent valve 31 and membrane separation device 32 in the supercritical brayton cycle system 2, the export of impurity gas of membrane separation device 32 is divided into two tunnel, wherein discharge all the way, another way is linked together with the one end of second air-vent valve 33 after passing through pipeline and pipe with the carbon dioxide export of membrane separation device 32, the other end of second air-vent valve 33 is linked together with the heat absorption side entry of low temperature regenerator 23 in the supercritical brayton cycle system 2, wherein, heat source 1 is boiler, waste heat exchanger or solar energy collection system.
The supercritical brayton cycle system 2 comprises a turbine 21, a high-temperature regenerator 22, a low-temperature regenerator 23, a precooler 24, a main compressor 25 and a recompressor 26; an inlet of a turbine 21 is communicated with a working medium side outlet of a heat source 1, an outlet of the turbine 21 is communicated with a heat releasing side inlet of a high-temperature heat regenerator 22, a heat releasing side outlet of the high-temperature heat regenerator 22 is communicated with a heat releasing side inlet of a low-temperature heat regenerator 23, a heat releasing side outlet of the low-temperature heat regenerator 23 is divided into two paths, one path is communicated with a working medium side inlet of a precooler 24, the other path is communicated with an inlet of a recompressor 26, a working medium side outlet of the precooler 24 is communicated with an inlet of a main compressor 25, a heat absorbing side outlet of the low-temperature heat regenerator 23 and an outlet of the recompressor 26 are communicated with a heat absorbing side inlet of the high-temperature heat regenerator 22 after being connected in parallel through a pipeline, and a heat.
The utility model discloses still include working medium complementary system 4, wherein, working medium complementary system 4 is linked together with precooler 24's entry, and is concrete, working medium complementary system 4 includes carbon dioxide liquid storage pot 41, carbon dioxide booster pump 42 and carbon dioxide evaporimeter 43, and wherein, the export of carbon dioxide liquid storage pot 41 is linked together through carbon dioxide booster pump 42 and carbon dioxide evaporimeter 43 and precooler 24's entry in proper order.
The utility model discloses a concrete working process does:
high-temperature supercritical carbon dioxide working medium heated by a heat source 1 enters a turbine 21 to do work, dead steam output by the turbine 21 sequentially enters the heat-releasing side of a high-temperature heat regenerator 22 and the heat-releasing side of a low-temperature heat regenerator 23 to release heat, and then is divided into two paths, wherein one path enters a precooler 24 to be cooled, the other path enters a recompressor 26 to be compressed, the working medium output by the precooler 24 is compressed by a main compressor 25 and is subjected to pressure regulation by a first pressure regulating valve 31 to enter a membrane separation device 32 to be separated and classified, impurity gas output by the membrane separation device 32 is divided into two paths, one path is discharged, the other path is converged with purified carbon dioxide working medium output by the membrane separation device 32 to enter a second pressure regulating valve 33, is subjected to pressure regulation by a second pressure regulating valve 33 to enter the heat-absorbing side of the low-temperature heat regenerator 23 to absorb heat, the working medium output by the heat-absorbing side of the low-temperature heat regenerator 23 and the working medium output by the, then the working medium enters a heat source 1 to be heated, and the whole working medium circulation flow is completed.
It should be noted that the impure gas outputted from the membrane separation device 32 is divided into two paths, wherein the distribution amount of the two paths of impure gas is comprehensively determined by the content of the impure gas in the system, the system efficiency, the carbon dioxide supplement cost and other factors, when the content of the impure gas in the system is low, the amount of the impure gas directly discharged is small, and conversely, when the content of the impure gas in the system is high, the amount of the discharged impure gas is large, and more pure carbon dioxide needs to be supplemented through the working medium supplement system 4.
It should be noted that the supercritical brayton cycle system 2 described in the present invention does not affect the protection scope of the present invention, the present invention is also applicable to other layouts of the supercritical cycle system, therefore, the present invention provides a supercritical brayton cycle system 2 which is a supercritical brayton cycle system 2 in a broad sense, rather than being limited to the layout shown in the figure. For example, other supercritical brayton cycle systems 2 may employ a multi-stage turbine system, or a turbine system with reheat, or may not employ a split recompression system, i.e., only one main compressor 25, without recompressor 26, and combine the two regenerators into one regenerator.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A supercritical carbon dioxide Brayton cycle working medium purification system is characterized by comprising a supercritical Brayton cycle system (2), a first pressure regulating valve (31), a second pressure regulating valve (33) and a membrane separation device (32), wherein an outlet of a main compressor (25) in the supercritical Brayton cycle system (2) is communicated with an inlet of the membrane separation device (32) through the first pressure regulating valve (31), an impurity gas outlet of the membrane separation device (32) is divided into two paths, one path of impurity gas is discharged, the other path of impurity gas outlet is communicated with one end of the second pressure regulating valve (33) after being connected with a carbon dioxide outlet of the membrane separation device (32) through a pipeline in parallel, and the other end of the second pressure regulating valve (33) is communicated with an inlet on the heat absorption side of a low-temperature heat regenerator (23) in the supercritical Brayton cycle system (2).
2. A supercritical carbon dioxide brayton cycle working medium purification system according to claim 1, characterized in that the supercritical brayton cycle system (2) comprises a turbine (21), a high temperature regenerator (22), a low temperature regenerator (23), a precooler (24), a main compressor (25) and a recompressor (26);
an inlet of a turbine (21) is communicated with a working medium side outlet of a heat source (1), an outlet of the turbine (21) is communicated with a heat releasing side inlet of a high-temperature heat regenerator (22), a heat releasing side outlet of the high-temperature heat regenerator (22) is communicated with a heat releasing side inlet of a low-temperature heat regenerator (23), a heat releasing side outlet of the low-temperature heat regenerator (23) is divided into two paths, one path is communicated with a working medium side inlet of a precooler (24), the other path is communicated with an inlet of a recompressor (26), a working medium side outlet of the precooler (24) is communicated with an inlet of a main compressor (25), a heat absorbing side outlet of the low-temperature heat regenerator (23) is communicated with a heat absorbing side inlet of the high-temperature heat regenerator (22) after being combined with an outlet of the recompressor (26) through a pipeline, and a heat absorbing side outlet of the high-temperature heat regenerator.
3. The supercritical carbon dioxide brayton cycle working medium purification system according to claim 2, further comprising a working medium replenishment system (4), wherein the working medium replenishment system (4) is in communication with the inlet of the precooler (24).
4. The supercritical carbon dioxide brayton cycle working medium purification system according to claim 3, characterized in that the working medium supplementing system (4) comprises a carbon dioxide liquid storage tank (41), a carbon dioxide booster pump (42) and a carbon dioxide evaporator (43), wherein the outlet of the carbon dioxide liquid storage tank (41) is communicated with the inlet of the precooler (24) through the carbon dioxide booster pump (42) and the carbon dioxide evaporator (43) in sequence.
5. The supercritical carbon dioxide brayton cycle working medium purification system according to claim 1, wherein the heat source (1) is a boiler, a waste heat exchanger or a solar heat collection system.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080843A (en) * | 2019-05-28 | 2019-08-02 | 西安热工研究院有限公司 | A kind of supercritical carbon dioxide Brayton cycle working medium purification system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080843A (en) * | 2019-05-28 | 2019-08-02 | 西安热工研究院有限公司 | A kind of supercritical carbon dioxide Brayton cycle working medium purification system and method |
| CN110080843B (en) * | 2019-05-28 | 2023-11-10 | 西安热工研究院有限公司 | Supercritical carbon dioxide Brayton cycle working medium purification system and method |
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