CN109386972B - Multi-tank fused salt heat storage system driven by coupling of compressed gas and fused salt pump - Google Patents
Multi-tank fused salt heat storage system driven by coupling of compressed gas and fused salt pump Download PDFInfo
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- CN109386972B CN109386972B CN201811339887.1A CN201811339887A CN109386972B CN 109386972 B CN109386972 B CN 109386972B CN 201811339887 A CN201811339887 A CN 201811339887A CN 109386972 B CN109386972 B CN 109386972B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 373
- 238000005338 heat storage Methods 0.000 title claims abstract description 17
- 230000008878 coupling Effects 0.000 title claims abstract description 13
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 13
- 239000006096 absorbing agent Substances 0.000 claims abstract description 23
- 230000006835 compression Effects 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000004146 energy storage Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
- F24H7/0408—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply
- F24H7/0433—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply the transfer medium being water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a multi-tank fused salt heat storage system driven by coupling of compressed gas and a fused salt pump, which comprises a low-temperature fused salt tank, a high-temperature fused salt tank, a salt storage tank, a compressed gas device, a heat exchanger, a high-temperature fused salt pump, a low-temperature fused salt pump, a high-temperature fused salt valve, a low-temperature fused salt valve, a gas valve and a heat absorber; the number of the salt storage tanks is not less than 2, and the salt storage tanks are arranged in parallel. The beneficial effects of the invention are as follows: by arranging a plurality of salt storage tanks in parallel, the volume of a single salt storage tank is reduced, and the processing and manufacturing difficulty and investment cost of the salt storage tank are reduced; the utilization rate of the molten salt tank is improved, the normal operation of the system is not affected by the failure of any single salt storage tank, and the risk of leakage of molten salt is reduced by avoiding perforation at the bottom of the molten salt tank; meanwhile, the method of combining the gas compression device with multi-tank molten salt reduces the use quantity of molten salt pumps in the system, reduces the running cost of the system and increases the safe reliability of the system running.
Description
Technical Field
The invention relates to the field of molten salt energy storage, in particular to a multi-tank molten salt heat storage system driven by coupling of compressed gas and a molten salt pump.
Background
The intermittent and fluctuating problems of new energy sources such as solar photovoltaic power generation and wind energy in China currently exist, and the fused salt serving as an energy storage material has the advantages of high energy storage density, no toxicity, no harm, low cost, easy obtainment, environment friendliness, safety and the like, and can well solve the problems. By utilizing the fused salt heat storage technology, the low-valley electricity or the waste electricity of the abandoned wind and the abandoned light are used for heating the fused salt, so that heat is supplied to a building or steam is supplied to industry, the peak-valley difference of a power grid can be greatly reduced, the power transmission capacity of the power grid is enhanced, the utilization efficiency of renewable energy sources can be improved, and the haze problem in heating seasons is relieved.
At present, a molten salt energy storage system mainly comprises a double-tank system, wherein the double-tank system comprises a cold salt tank and a hot salt tank. The low temperature fused salt in the cold salt tank is conveyed to the heater by the pump and then enters the hot salt tank to be stored and then conveyed to the heat exchange equipment, along with the increase of energy storage requirements, the volume of the fused salt tank is increased, the processing and manufacturing difficulty is increased, meanwhile, the equipment danger is increased, the fused salt is easy to leak, the safe and stable operation of the system is not facilitated, meanwhile, any one of the salt storage tanks breaks down, the system needs to be completely stopped, and the influence and the loss to enterprises are large.
Disclosure of Invention
The invention provides a multi-tank fused salt heat storage system driven by coupling compressed gas and a fused salt pump, which solves the problems or partially solves the problems.
The technical scheme of the invention is as follows:
a multi-tank fused salt heat storage system driven by coupling of compressed gas and a fused salt pump comprises a high-temperature fused salt tank, a low-temperature fused salt tank, a salt storage tank, a fused salt pipeline, a high-temperature fused salt pump, a low-temperature fused salt valve, a high-temperature fused salt valve, a gas compression device, a gas valve, a heat absorber and a heat exchanger.
The high-temperature salt melting tank, the low-temperature salt melting tank and the salt storage tank are in a three-dimensional cylinder shape or a cylindrical horizontal shape.
The salt storage tanks are arranged in parallel, and the number of the salt storage tanks is not less than 2.
The low-temperature molten salt pump, the high-temperature molten salt pump, the low-temperature molten salt valve and the high-temperature molten salt valve are arranged above the salt storage tank, the high-temperature molten salt tank and the low-temperature molten salt tank.
The heat absorber is a central heat absorber of a tower type photo-thermal system, a heat collector of a groove type photo-thermal system, a heat collector of a linear Fresnel photo-thermal system and an electric heating device.
The heat absorption medium of the heat exchanger is water or heat conduction oil.
The gas in the compressed gas device is air or nitrogen.
According to the invention, the multi-tank fused salt heat storage system driven by coupling compressed gas and fused salt pumps is adopted, the salt storage tanks are arranged in parallel, the volume of a single fused salt tank is reduced, the volume utilization rate of the fused salt tank is improved, the processing and manufacturing difficulty is reduced, the bottom of the fused salt tank is prevented from being perforated, the fused salt leakage risk is reduced, any single salt storage tank fails, the system can normally and stably operate, the use quantity of the fused salt pumps in the system is reduced, the operation cost of the system is reduced, and the safety and reliability of the system operation are improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a multi-tank fused salt heat storage system driven by coupling of compressed gas and a fused salt pump.
The system comprises a 1-low-temperature molten salt tank, a 2-low-temperature molten salt pump, a 3-heat absorber, a 4-high-temperature molten salt tank, a 5-first low-temperature molten salt valve, a 6-first salt storage tank, a 7-first high-temperature molten salt pump, an 8-second low-temperature molten salt valve, a 9-second high-temperature molten salt valve, a 10-third low-temperature molten salt valve, a 11-third high-temperature molten salt valve, a 12-gas compression device, a 13-first gas valve, a 14-second salt storage tank, a 15-second gas valve, a 16-fourth high-temperature molten salt valve, a 17-fourth low-temperature molten salt valve, a 18-fifth low-temperature molten salt valve, a 19-heat exchanger and a 20-fifth high-temperature molten salt valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 is a schematic structural diagram of a multi-tank molten salt heat storage system driven by coupling compressed gas and a molten salt pump, as shown in fig. 1, and the multi-tank molten salt heat storage system comprises a low-temperature molten salt tank 1, a low-temperature molten salt pump 2, a heat absorber 3, a high-temperature molten salt tank 4, a first low-temperature molten salt valve 5, a first salt storage tank 6, a first high-temperature molten salt pump 7, a second low-temperature molten salt valve 8, a second high-temperature molten salt valve 9, a third low-temperature molten salt valve 10, a third high-temperature molten salt valve 11, a gas compression device 12, a first gas valve 13, a second salt storage tank 14, a second gas valve 15, a fourth high-temperature molten salt valve 16, a fourth low-temperature molten salt valve 17, a fifth low-temperature molten salt valve 18, a heat exchanger 19 and a fifth high-temperature molten salt valve 20.
The low-temperature molten salt tank 1 is connected with the heat absorber 3 through the low-temperature molten salt pump 2, the first salt storage tank 6 and the second salt storage tank 14 are connected with the heat absorber 3 in parallel, a second high-temperature molten salt valve 9 is arranged between the heat absorber 3 and the first salt storage tank 6, and a fourth high-temperature molten salt valve 16 is arranged between the heat absorber 3 and the second salt storage tank 14; the first salt storage tank 6 is connected with the high-temperature molten salt tank 4 through a third high-temperature molten salt valve 11; the second salt storage tank 14 is connected with the high-temperature molten salt tank 4 through a fifth high-temperature molten salt valve 20; the first salt storage tank 6 is connected with the low-temperature molten salt tank 1 through two parallel branches, the first salt storage tank 6 is connected with the low-temperature molten salt tank 1 through a third low-temperature molten salt valve 10 in the first branch, and the first salt storage tank 6 is connected with the low-temperature molten salt tank 1 through a second low-temperature molten salt valve 8 and a first low-temperature molten salt valve 5 in the second branch; the second salt storage tank 14 is connected with the low-temperature molten salt tank 1 through two parallel branches, wherein in the first branch, the second salt storage tank 14 is connected with the low-temperature molten salt tank 1 through a fourth low-temperature molten salt valve 17, and in the second branch, the second salt storage tank 14 is connected with the low-temperature molten salt tank 1 through a fifth low-temperature molten salt valve 18 and a first low-temperature molten salt valve 5; the high-temperature molten salt tank 4 is connected with the low-temperature molten salt tank 1 through a first high-temperature molten salt pump 7, a heat exchanger 19 and a first low-temperature molten salt valve 5; the second low-temperature molten salt valve 8 and the fifth low-temperature molten salt valve 18 are connected in parallel with the first low-temperature molten salt valve 5; the first salt storage tank 6 and the second salt storage tank 14 are connected through a first gas valve 13, a gas compression device 12 and a second gas valve 15.
In the system heat storage process, a first salt storage tank 6 and a salt storage tank 14 are filled with low-temperature molten salt, a first gas valve 13 is firstly opened, a third low-temperature molten salt valve 10 is closed, all other valves are closed, the low-temperature molten salt in the first salt storage tank 6 is conveyed to a low-temperature molten salt tank 1 through a gas compression device 12, then the low-temperature molten salt in the low-temperature molten salt tank 1 is pumped into a heat absorber 3 through a low-temperature molten salt pump 2, a fourth high-temperature molten salt valve 16 is closed, a second high-temperature molten salt valve 9 is opened, high-temperature molten salt flowing out of the heat absorber 3 flows into the first salt storage tank 6, meanwhile, a first gas valve 13 is opened, a third high-temperature molten salt valve 11 presses the high-temperature molten salt into the high-temperature molten salt tank 4 through the gas compression device 12, then enters a heat exchanger 19 through a first high-temperature molten salt pump 7 for heat exchange, meanwhile, a fifth low-temperature molten salt valve 18 is closed, the second low-temperature molten salt valve 8 is opened, the low-temperature molten salt flowing out of the heat exchanger 19 flows into the low-temperature molten salt tank 1, and the low-temperature molten salt pump 2 is larger than the first high-temperature molten salt pump 7, and the high-temperature molten salt storage tank 14 is filled up to the first high-temperature molten salt storage tank 14 according to the flow.
In the system heat release process, a first salt storage tank 6 and a salt storage tank 14 are filled with high-temperature molten salt, a gas valve 13 and a third high-temperature molten salt valve 11 are firstly opened, a third low-temperature molten salt valve 10 is closed, a second low-temperature molten salt valve 8 and a second high-temperature molten salt valve 9 are pressed into a second high-temperature molten salt tank 4 through a gas compression device 12, then the high-temperature molten salt in the first salt storage tank 6 flows into a heat exchanger 19 through a first high-temperature molten salt pump 7 to exchange heat, a fifth low-temperature molten salt valve 18 is closed, the second low-temperature molten salt valve 8 is opened, the first low-temperature molten salt valve 5 is opened, the low-temperature molten salt flows into the low-temperature molten salt tank 1 from the second heat exchanger 19 until the high-temperature molten salt in the first salt storage tank 6 is completely discharged, and at the moment, the low-temperature molten salt tank 1 is filled with the low-temperature molten salt. According to the method, high-temperature molten salt in the second salt storage tank 14 is pressed into the high-temperature molten salt tank 4 through the gas compression device 12, then flows into the heat exchanger 19 through the first high-temperature molten salt pump 7 for heat exchange, simultaneously closes the fifth low-temperature molten salt valve 18, opens the first low-temperature molten salt valve 5, opens the second low-temperature molten salt valve 8, and flows into the first salt storage tank 6 from the fourth heat exchanger 16 until the high-temperature molten salt in the second salt storage tank 14 is completely discharged, and at the moment, the first salt storage tank 6 is filled with the low-temperature molten salt.
The high-temperature molten salt tank 4, the low-temperature molten salt tank 1, the first salt storage tank 6 and the second salt storage tank 14 are in a three-dimensional cylinder shape or a cylindrical horizontal shape.
The first salt storage tank 6 and the second salt storage tank 14 are arranged in parallel, and the total number of the first salt storage tank 6 and the second salt storage tank 14 in the system is not less than 2.
The low-temperature molten salt pump, the high-temperature molten salt pump, the low-temperature molten salt valve and the high-temperature molten salt valve are arranged above the salt storage tank, the high-temperature molten salt tank and the low-temperature molten salt tank.
The heat absorber 3 is a central heat absorber of a tower type photo-thermal system, a heat collector of a groove type photo-thermal system, a heat collector of a linear Fresnel photo-thermal system or an electric heating device.
The heat absorbing medium of the heat exchanger 19 is water or heat conducting oil.
The gas in the compressed gas device is air or nitrogen.
Example 2
Similar to the structure in the embodiment 1, the system is provided with a third salt storage tank in parallel, and the third salt storage tank, the first salt storage tank 6 and the second salt storage tank 14 are arranged in parallel, so that the working requirement of the system is met according to the working requirement of the molten salt energy storage system; in addition, when any salt storage tank fails, the system can normally and stably operate, and the whole safety and reliability are ensured.
According to the multi-tank fused salt heat storage system driven by coupling of compressed gas and the fused salt pump, the plurality of salt storage tanks are arranged in parallel, so that the volume of a single salt storage tank is reduced, the utilization rate of the volume of the fused salt tank is improved, the processing and manufacturing difficulty is reduced, holes are prevented from being formed in the bottom of the fused salt tank, the fused salt leakage risk is reduced, any single salt storage tank breaks down, the system can normally and stably operate, the use quantity of the fused salt pumps in the system is reduced, the operation cost of the system is reduced, and the safe reliability of the system operation is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A compressed gas and molten salt pump coupling driven multi-tank molten salt heat storage system is characterized in that: the low-temperature molten salt heat pump comprises a low-temperature molten salt tank (1), a low-temperature molten salt pump (2), a heat absorber (3), a high-temperature molten salt tank (4), a first low-temperature molten salt valve (5), a first salt storage tank (6), a first high-temperature molten salt pump (7), a second low-temperature molten salt valve (8), a second high-temperature molten salt valve (9), a third low-temperature molten salt valve (10), a third high-temperature molten salt valve (11), a gas compression device (12), a first gas valve (13), a second salt storage tank (14), a second gas valve (15), a fourth high-temperature molten salt valve (16), a fourth low-temperature molten salt valve (17), a fifth low-temperature molten salt valve (18), a heat exchanger (19) and a fifth high-temperature molten salt valve (20);
the low-temperature molten salt tank (1) is connected with the heat absorber (3) through the low-temperature molten salt pump (2), the first salt storage tank (6) and the second salt storage tank (14) are connected with the heat absorber (3) in parallel, a second high-temperature molten salt valve (9) is arranged between the heat absorber (3) and the first salt storage tank (6), and a fourth high-temperature molten salt valve (16) is arranged between the heat absorber (3) and the second salt storage tank (14); the first salt storage tank (6) is connected with the high-temperature molten salt tank (4) through a third high-temperature molten salt valve (11); the second salt storage tank (14) is connected with the high-temperature salt melting tank (4) through a fifth high-temperature salt melting valve (20); the first salt storage tank (6) is connected with the low-temperature molten salt tank (1) through two parallel branches, the first salt storage tank (6) is connected with the low-temperature molten salt tank (1) through a third low-temperature molten salt valve (10) in the first branch, and the first salt storage tank (6) is connected with the low-temperature molten salt tank (1) through a second low-temperature molten salt valve (8) and a first low-temperature molten salt valve (5) in the second branch; the second salt storage tank (14) is connected with the low-temperature molten salt tank (1) through two parallel branches, the second salt storage tank (14) is connected with the low-temperature molten salt tank (1) through a fourth low-temperature molten salt valve (17) in the first branch, and the second salt storage tank (14) is connected with the low-temperature molten salt tank (1) through a fifth low-temperature molten salt valve (18) and a first low-temperature molten salt valve (5) in the second branch; the high-temperature molten salt tank (4) is connected with the low-temperature molten salt tank (1) through a first high-temperature molten salt pump (7), a heat exchanger (19) and a first low-temperature molten salt valve (5); the second low-temperature molten salt valve (8) and the fifth low-temperature molten salt valve (18) are connected with the first low-temperature molten salt valve (5) in parallel; the first salt storage tank (6) and the second salt storage tank (14) are connected through a first gas valve (13), a gas compression device (12) and a second gas valve (15);
in the system heat storage process, a first salt storage tank (6) and a second salt storage tank (14) are filled with low-temperature molten salt, a first gas valve (13) is firstly opened, a third low-temperature molten salt valve (10) is closed, all other valves are closed, low-temperature molten salt in the first salt storage tank (6) is conveyed to the low-temperature molten salt tank (1) through a gas compression device (12), then the low-temperature molten salt in the low-temperature molten salt tank (1) is pumped into a heat absorber (3) through a low-temperature molten salt pump (2), a fourth high-temperature molten salt valve (16) is closed, a second high-temperature molten salt valve (9) is opened, high-temperature molten salt flowing out of the heat absorber (3) flows into the first salt storage tank (6), meanwhile, the first gas valve (13) is opened, the third high-temperature molten salt valve (11) presses the high-temperature molten salt into the high-temperature molten salt tank (4) through a gas compression device (12), then the low-temperature molten salt enters a heat exchanger (19) through a first high-temperature molten salt pump (7) to exchange heat, meanwhile, the fifth low-temperature molten salt valve (18) is closed, the second low-temperature molten salt valve (8) is opened, the high-temperature molten salt (7) flows out of the first high-temperature molten salt pump (7) until the high-temperature molten salt (1) flows out of the high-temperature pump (1) and flows out of the high-temperature pump (1), filling the second salt storage tank (14) with high-temperature molten salt according to the flow; the method comprises the steps that in a system heat release process, a first salt storage tank (6) and a salt storage tank (14) are filled with high-temperature molten salt, a gas valve (13) and a third high-temperature molten salt valve (11) are firstly opened, a third low-temperature molten salt valve (10) is closed, a second low-temperature molten salt valve (8) and a second high-temperature molten salt valve (9) are arranged, the high-temperature molten salt in the first salt storage tank (6) is pressed into a second high-temperature molten salt tank (4) through a gas compression device (12), then flows into a heat exchanger (19) through a first high-temperature molten salt pump (7) to exchange heat, meanwhile, a fifth low-temperature molten salt valve (18) is closed, the second low-temperature molten salt valve (8) is opened, the low-temperature molten salt flows into a low-temperature molten salt tank (1) from the second heat exchanger (19) until all high-temperature molten salt in the first salt storage tank (6) is discharged, and the low-temperature molten salt tank (1) is filled with the low-temperature molten salt; according to the method, high-temperature molten salt in a second salt storage tank (14) is pressed into a high-temperature molten salt tank (4) through a gas compression device (12), then flows into a heat exchanger (19) through a first high-temperature molten salt pump (7) to exchange heat, simultaneously a fifth low-temperature molten salt valve (18) is closed, a first low-temperature molten salt valve (5) is opened, a second low-temperature molten salt valve (8) is opened, low-temperature molten salt flows into a first salt storage tank (6) from a fourth heat exchanger until the high-temperature molten salt in the second salt storage tank (14) is completely discharged, and at the moment, the first salt storage tank (6) is filled with the low-temperature molten salt; the heat absorption medium of the heat exchanger (19) is water or heat conduction oil; the gas in the compressed gas device is air or nitrogen; the low-temperature molten salt pump, the high-temperature molten salt pump, the low-temperature molten salt valve and the high-temperature molten salt valve are arranged above the salt storage tank, the high-temperature molten salt tank and the low-temperature molten salt tank; the heat absorber (3) is a central heat absorber of a tower type photo-thermal system, a heat collector of a groove type photo-thermal system, a heat collector of a linear Fresnel photo-thermal system or an electric heating device.
2. The multi-tank molten salt heat storage system driven by coupling of compressed gas and a molten salt pump as claimed in claim 1, wherein: the high-temperature molten salt tank (4), the low-temperature molten salt tank (1), the first salt storage tank (6) and the second salt storage tank (14) are in a three-dimensional cylinder shape or a cylindrical horizontal shape.
3. The multi-tank molten salt heat storage system driven by coupling of compressed gas and a molten salt pump as claimed in claim 1, wherein: the first salt storage tank (6) and the second salt storage tank (14) are arranged in parallel, and the number of the first salt storage tank (6) and the second salt storage tank (14) is not less than 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811339887.1A CN109386972B (en) | 2018-11-12 | 2018-11-12 | Multi-tank fused salt heat storage system driven by coupling of compressed gas and fused salt pump |
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| CN201811339887.1A CN109386972B (en) | 2018-11-12 | 2018-11-12 | Multi-tank fused salt heat storage system driven by coupling of compressed gas and fused salt pump |
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| CN109386972A CN109386972A (en) | 2019-02-26 |
| CN109386972B true CN109386972B (en) | 2024-03-26 |
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| CN114353350A (en) * | 2021-12-31 | 2022-04-15 | 中广核太阳能德令哈有限公司 | Heat storage circulating system of groove type photo-thermal power station and control method thereof |
| CN114876599B (en) * | 2022-05-09 | 2023-06-27 | 徐州工程学院 | Molten salt new energy power system, control method and mobile equipment |
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| CN209116560U (en) * | 2018-11-12 | 2019-07-16 | 北京工业大学 | A kind of multiple tank fused salt hold over system of compressed gas and pump for liquid salts coupling driving |
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| CN203053050U (en) * | 2012-12-07 | 2013-07-10 | 上海工电能源科技有限公司 | Tank field of solar energy heat generating station |
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