CN222230516U - A thermal remelting salt heat storage system for thermal power plants - Google Patents
A thermal remelting salt heat storage system for thermal power plants Download PDFInfo
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- CN222230516U CN222230516U CN202420546279.2U CN202420546279U CN222230516U CN 222230516 U CN222230516 U CN 222230516U CN 202420546279 U CN202420546279 U CN 202420546279U CN 222230516 U CN222230516 U CN 222230516U
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- 150000003839 salts Chemical class 0.000 title claims abstract description 156
- 238000005338 heat storage Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000000605 extraction Methods 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims 1
- 239000000284 extract Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 2
- 238000010992 reflux Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The application belongs to the technical field of peak regulation and energy storage of thermal power plants, and particularly provides a thermal remelting salt heat storage system of a thermal power plant, which is provided with a main steam turbine, a boiler (1), a main steam pipeline and a main reflux pipeline, wherein an outlet of a reheater (2) is communicated with a medium pressure cylinder (4) through a primary reflux steam pipeline and is used for conveying thermal remelting steam (21) heated by the reheater (2) to the medium pressure cylinder (4), and the thermal remelting salt heat storage system comprises a steam molten salt heat exchanger (11) and is used for extracting a part of the thermal remelting steam (21) and exchanging heat between the thermal remelting steam (21) and low-temperature molten salt flowing in the thermal remelting steam to obtain a first industrial steam supply (22) and high-temperature molten salt. The steam fused salt heat exchanger (11) extracts partial hot re-steam (21), stores heat of the steam fused salt heat exchanger in a high-temperature fused salt form for later use, so that the heat of the high-temperature fused salt can be reused under the condition of need, and compared with the existing method that steam of a boiler is directly supplied to an external user, the steam fused salt heat exchanger is more flexible, and waste of heat or power is avoided.
Description
Technical Field
The application belongs to the technical field of peak regulation and energy storage of thermal power plants, and particularly relates to a thermal remelting salt heat storage system of a thermal power plant.
Background
In the electricity consumption valley period, the load reduction capability of the steam supply unit is severely limited because the steam supply unit is influenced by steam supply parameters, and if the condition of large generation of new energy appears, the electric power is obviously rich, and the problems of wind abandoning, light abandoning and the like can occur. In order to better develop and eliminate new energy sources, the three-change linkage of the coal power energy-saving carbon reduction transformation, the flexibility transformation and the heat supply transformation is promoted, and the coal power is transformed from a main power supply of the electric quantity to a supporting and adjusting power supply.
The operation flexibility of the steam supply and heating unit in the prior art has the following technical problems that the operation load is usually adjusted by adopting a steam extraction mode of a steam turbine, and the extracted steam is directly supplied to an external user as industrial steam supply, but the mode can not simultaneously meet the load adjustment of the steam turbine and the adjustment of the industrial steam supply demand by the external user, so that the waste of heat energy is easily caused, and the flexibility is insufficient.
Disclosure of utility model
The application provides a thermal power plant hot remelting salt heat storage system which comprises a main steam turbine, a boiler, a main steam pipeline and a main return pipeline, wherein the main steam turbine is provided with a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, the boiler is used for supplying high-temperature and high-pressure main steam to the high-pressure cylinder by the main steam pipeline, the main return pipeline is used for conveying condensate water of the low-pressure cylinder back to the boiler, a reheater is arranged on the boiler, an inlet of the reheater is communicated with an outlet of the high-pressure cylinder through a first-stage return pipeline, the first-stage return pipeline is used for conveying first-stage return steam of the high-pressure cylinder to the reheater, an outlet of the reheater is communicated with the medium-pressure cylinder through a first-stage return steam pipeline and used for conveying hot re-steam heated by the reheater to the medium-pressure cylinder, and the medium-pressure cylinder is communicated with the low-pressure cylinder through a second-stage return pipeline and used for conveying second-stage return steam output by the medium-pressure cylinder to the low-pressure cylinder, and the thermal storage system comprises:
The steam molten salt heat exchanger is used for extracting a part of hot re-steam, exchanging heat between the hot re-steam and low-temperature molten salt flowing in the steam molten salt heat exchanger to obtain first industrial steam supply and high-temperature molten salt, and the temperature of the hot re-steam is higher than that of the first industrial steam supply.
Further, the system further comprises:
the low-temperature molten salt storage tank is communicated with a molten salt inlet of the steam molten salt heat exchanger;
And the high-temperature molten salt storage tank is communicated with a molten salt outlet of the steam molten salt heat exchanger.
Further, the system further comprises:
The molten salt steam heat exchanger is used for exchanging heat with water supply of a unit by utilizing high-temperature molten salt in the high-temperature molten salt storage tank to obtain low-temperature molten salt and second industrial steam supply, and the low-temperature molten salt is stored in the low-temperature molten salt storage tank;
And the unit water supply pipe is used for providing water supply for the unit.
Further, the second industrial steam supply is for providing to the main turbine and/or an external user.
Further, the first industrial steam supply is for providing to an external user.
Further, a molten salt heater is arranged between the molten salt outlet of the steam molten salt heat exchanger and the high-temperature molten salt storage tank.
Further, a water supply valve is arranged on the water supply pipe of the unit, and a steam supply valve II is arranged at a steam outlet of the fused salt steam heat exchanger.
Further, a hot re-steam inlet of the steam molten salt heat exchanger is provided with a reheater hot section steam extraction and supply valve.
Further, a steam outlet of the steam molten salt heat exchanger is provided with a temperature and pressure reducer and a steam supply valve I.
Further, an outlet of the low-temperature molten salt storage tank is provided with a low-temperature molten salt pump;
And the outlet of the high-temperature molten salt storage tank is provided with a high-temperature molten salt pump.
Further, the system also comprises a generator connected with the main turbine;
The main return pipeline is sequentially provided with a low-pressure heater, a deaerator and a high-pressure heater.
The technical scheme of the application has at least the following beneficial technical effects:
The system extracts a part of hot re-steam to adjust the operation power of the medium pressure cylinder, exchanges heat between the hot re-steam and low-temperature molten salt flowing in the hot re-steam to obtain the first industrial steam supply and high-temperature molten salt, stores the heat of the hot re-steam in the form of the high-temperature molten salt for later use, and recycles the heat in the high-temperature molten salt under the condition of need.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic structural diagram of a thermal power plant thermal remelting salt heat storage system according to an embodiment of the application.
FIG. 2 is a schematic diagram of a heat storage and release portion of a system according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a thermal power plant thermal remelting salt heat storage system according to another embodiment of the application.
FIG. 4 is a schematic diagram of a heat storage and release portion of a system according to another embodiment of the present application.
Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 3 is:
1. The boiler comprises a boiler, a reheater, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a low-pressure heater, a deaerator, a high-pressure heater, a reheater hot section steam extraction and supply valve, a steam fused salt heat exchanger, a temperature and pressure reducing device, a steam supply valve I, a low-temperature fused salt storage tank, a high-temperature fused salt storage tank, a low-temperature fused salt pump, a high-temperature fused salt pump, a water supply valve 18, a fused salt steam heat exchanger, a steam supply valve II, a steam supply valve 21, steam re-supply steam, a first industrial steam supply valve 22, a unit water supply pipe 23, a second industrial steam supply pipe 24, and an electric heater 25.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be understood by those of ordinary skill in the art that in various embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the present application. The claimed application may be practiced without these specific details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments can be combined with each other and cited with each other without contradiction.
At present, in the prior art, the operation load is adjusted by adopting a steam extraction mode of a steam turbine, and extracted steam is directly supplied to an external user as industrial steam supply, but the mode can not simultaneously meet the problems of load adjustment of the steam turbine and adjustment of the industrial steam supply demand of the external user.
In order to solve the problems, as shown in fig. 1, an embodiment of the application provides a thermal power plant hot remelting salt heat storage system, a power generation system of a traditional thermal power plant mainly comprises a main turbine, a boiler 1, a main steam pipeline and a main backflow pipeline, wherein the main turbine is provided with a high-pressure cylinder 3, a medium-pressure cylinder 4 and a low-pressure cylinder 5 which are sequentially connected and jointly provide power for a generator 6, the boiler 1 utilizes the main steam pipeline to provide high-pressure cylinder 3 with high-temperature and high-pressure main steam, the main backflow pipeline is used for conveying condensed water after condensation in the low-pressure cylinder 5 back to the boiler 1 so as to enable the steam to be recycled between the boiler and the main turbine, the boiler 1 is further provided with a reheater 2, an inlet of the reheater 2 is communicated with an outlet of the high-pressure cylinder 3 through a primary backflow pipeline, the primary backflow pipeline is used for conveying the primary backflow steam of the high-pressure cylinder 3 to the reheater 2, an outlet of the reheater 2 is communicated with the medium-pressure cylinder 4 through the primary backflow steam pipeline and is used for conveying the heated hot remelting steam 21 of the reheater 2 to the medium-pressure cylinder 4, the medium-pressure cylinder 4 is communicated with the low-pressure cylinder 5 through a secondary backflow pipeline, and the medium-pressure backflow pipeline is used for conveying the secondary backflow steam to the medium-pressure cylinder 5.
The main steam produced by the extraction boiler 1 adjusts the overall operation power of the main turbine, or extracts the first-stage return steam outputted from the high-pressure cylinder 3 to adjust the operation power of the high-pressure cylinder 3, or extracts the hot re-steam 21 heated by the reheater 2 to adjust the operation power of the intermediate-pressure cylinder 4, and provides the extracted steam to an external user. The system is also provided with the steam fused salt heat exchanger 11, when electricity consumption is low or the power generation system needs low load operation, a part of hot rebeam 21 is extracted to adjust the operation power of the medium-pressure cylinder 4, the steam fused salt heat exchanger 11 exchanges heat between the hot rebeam 21 and low-temperature fused salt flowing in the steam fused salt heat exchanger to obtain a first industrial steam supply 22 and high-temperature fused salt, the temperature of the hot rebeam 21 is higher than that of the first industrial steam supply 22, and the heat of the hot rebeam 21 is stored in a high-temperature fused salt form for standby so as to recycle the heat in the high-temperature fused salt when the heat is needed.
Further, the system also includes a low temperature molten salt storage tank 14 and a high temperature molten salt storage tank 15. The low-temperature molten salt is stored in the low-temperature molten salt storage tank 14 and is communicated with a molten salt inlet of the steam molten salt heat exchanger 11, the high-temperature molten salt storage tank 15 is communicated with a molten salt outlet of the steam molten salt heat exchanger 11, and the high-temperature molten salt obtained by heat exchange is stored for later use.
In one embodiment of the application, as shown in the schematic structural diagram of the heat storage and release part of the system in fig. 2, the system further comprises a molten salt steam heat exchanger 19 which is respectively communicated with the high-temperature molten salt storage tank 15 and the low-temperature molten salt storage tank 14 and is used for exchanging heat with the unit water supply by utilizing the high-temperature molten salt in the high-temperature molten salt storage tank 15 to obtain low-temperature molten salt and a second industrial steam supply 24, the low-temperature molten salt is stored in the low-temperature molten salt storage tank 14, and the unit water supply pipe 23 can supply water for the boiler 1 and also can supply unit water for the molten salt steam heat exchanger 19.
Further, the second industrial steam supply 24 is for providing to the main turbine and/or an external user. The first industrial steam supply 22 is for providing to an external user. The water supply pipe 23 of the unit is provided with a water supply valve 18 for adjusting the water supply amount, and the steam outlet of the fused salt steam heat exchanger 19 is provided with a steam supply valve II 20 for adjusting the output amount of the second industrial steam supply 24.
In this embodiment, when the power grid needs high load or full load peak shaving, the unit water supply pipe 23 provides a part of unit water supply to the molten salt steam heat exchanger 19 (including the preheater, the evaporator and the superheater), and the unit water supply absorbs heat in the high-temperature molten salt from the high-temperature molten salt storage tank 15 to generate the second industrial steam supply 24, so as to meet the requirement of industrial steam supply parameters, replace part or all of unit steam extraction, and enable the unit to meet the requirement of the high load or full load power grid. The high-temperature molten salt pump 17 conveys the high-temperature molten salt of the high-temperature molten salt storage tank 15 to the molten salt steam heat exchanger 19 to release heat, and the low-temperature molten salt obtained after heat release enters the low-temperature molten salt storage tank 14.
In one embodiment of the application, as shown in fig. 3 and 4, an electric heater 25 is provided between the molten salt outlet of the steam molten salt heat exchanger 11 and the high temperature molten salt storage tank 15. In order to reasonably utilize the storage space of the high-temperature molten salt storage tank 15, the high-temperature molten salt is generally made to have a higher heat mass ratio, that is, the use amount of the molten salt can be reduced by the high-temperature molten salt with higher temperature, so that the space and the transmission cost are saved, and therefore, the electric heater 25 is utilized to heat the high-temperature molten salt before the high-temperature molten salt enters the high-temperature molten salt storage tank 15. The electric heater 25 utilizes the electric power generated by the power system, particularly when the power grid is in low load, reduces the waste of electric quantity, further participates in peak regulation of the thermal power plant, and can also improve the frequency modulation capability of the unit.
Further, a reheater hot stage steam extraction and supply valve 10 is arranged at the inlet of the hot reheat steam 21 of the steam molten salt heat exchanger 11 and is used for controlling the amount of the extracted hot reheat steam 21.
Further, a temperature and pressure reducer 12 and a first steam supply valve 13 are arranged at a steam outlet of the steam molten salt heat exchanger 11, and in order to ensure the heat exchange efficiency of molten salt and steam, the steam obtained by heat exchange with low-temperature molten salt still has higher temperature and high pressure, and the steam can be provided for common heat utilization users in external users after temperature and pressure reduction.
Further, the system also comprises a generator 6 connected with the main steam turbine, the main steam turbine provides power for the generator 6, a low-pressure heater 7, a deaerator 8 and a high-pressure heater 9 are sequentially arranged on the main return pipeline from the main steam turbine to the downstream, and the low-pressure heater 7 and the high-pressure heater 9 are used for preheating condensed water entering the boiler 1 and providing proper pressure.
In one embodiment of the application, when the power grid requires the unit (comprising the main turbine) to reduce load and peak shaving, when the unit load is reduced to 50% or lower, the existing steam supply parameters cannot meet the requirements, and by increasing the hot section steam extraction point of the reheater 2, a part of high-temperature steam is obviously stored in molten salt. The heat is stored, part of hot re-steam 21 is extracted and passes through the steam molten salt heat exchanger 11, after part of sensible heat of the hot re-steam 21 is released, fine adjustment is carried out through the temperature and pressure reducer 12 according to the requirements of industrial steam parameters, the requirements of external users on industrial steam supply are met, the flexibility of steam supply is improved, the molten salt in the low-temperature molten salt storage tank 14 is conveyed to the steam molten salt heat exchanger 11 by the low-temperature molten salt pump 16, the heat is absorbed by the molten salt with the increased temperature after heat exchange, and the molten salt enters the high-temperature molten salt storage tank 15 for standby.
When the power grid needs high-load or full-load operation of the unit, a part of water supply of the unit is enabled to be absorbed by a molten salt steam heat exchanger 19 (comprising a preheater, an evaporator and a superheater) through a molten salt steam heat exchanger, so that steam is generated, the requirement of industrial steam supply parameters is met, and part or all of unit steam extraction is replaced, so that the unit meets the requirement of the high-load or full-load power grid. The high-temperature molten salt pump 17 conveys the molten salt of the high-temperature molten salt storage tank 15 to the molten salt steam heat exchanger 19 to release heat, and the exothermic molten salt enters the low-temperature molten salt storage tank 14.
In this embodiment, the system is adjusted at any time according to the amount of steam required by the main turbine and the amount of steam supplied required by an external user, and both can be adjusted separately without collision, avoiding waste of heat or power.
It is to be understood that the above-described embodiments of the present application are merely illustrative of or explanation of the principles of the present application and are in no way limiting of the application. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application should be included in the scope of the present application. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (10)
1. A thermal power plant's hot remelting salt heat storage system, has main steam turbine, boiler (1), main steam pipe way and main return line, main steam turbine has high pressure cylinder (3), well pressure cylinder (4) and low pressure cylinder (5), boiler (1) utilize main steam pipe way to provide high temperature high pressure main steam to high pressure cylinder (3), main return line is used for carrying back the condensate water of low pressure cylinder (5) boiler (1), characterized in that includes:
The boiler is characterized in that a reheater (2) is arranged on the boiler (1), an inlet of the reheater (2) is communicated with an outlet of a high-pressure cylinder (3) through a primary backflow pipeline, the primary backflow pipeline is used for conveying primary backflow steam of the high-pressure cylinder (3) to the reheater (2), an outlet of the reheater (2) is communicated with a medium-pressure cylinder (4) through a primary backflow steam pipeline and is used for conveying hot reflow steam (21) heated by the reheater (2) to the medium-pressure cylinder (4), and the medium-pressure cylinder (4) is communicated with a low-pressure cylinder (5) through a secondary backflow pipeline and is used for conveying secondary backflow steam output by the medium-pressure cylinder (4) to the low-pressure cylinder (5);
The steam molten salt heat exchanger (11) is used for extracting a part of hot re-steam (21), exchanging heat between the hot re-steam (21) and low-temperature molten salt flowing in the hot re-steam (21) to obtain a first industrial steam supply (22) and high-temperature molten salt, and the temperature of the hot re-steam (21) is higher than that of the first industrial steam supply (22).
2. The thermal power plant thermal remelting salt heat storage system of claim 1 further comprising:
A low-temperature molten salt storage tank (14) communicated with a molten salt inlet of the steam molten salt heat exchanger (11);
And the high-temperature molten salt storage tank (15) is communicated with a molten salt outlet of the steam molten salt heat exchanger (11).
3. The thermal power plant thermal remelting salt heat storage system of claim 2 further comprising:
the molten salt steam heat exchanger (19) is used for exchanging heat with unit water supply by utilizing high-temperature molten salt in the high-temperature molten salt storage tank (15) to obtain low-temperature molten salt and second industrial steam supply (24), and the low-temperature molten salt is stored in the low-temperature molten salt storage tank (14);
And a unit water supply pipe (23) for supplying the unit water supply.
4. A thermal power plant thermal re-melt salt heat storage system according to claim 3, characterized in that the second industrial steam supply (24) is for providing to the main turbine and/or an external user.
5. A thermal power plant thermal re-melt salt heat storage system according to claim 3, characterized in that the first industrial steam supply (22) is for providing to an external user.
6. Thermal power plant hot remelting salt heat storage system according to claim 2, characterized in that an electric heater (25) is arranged between the molten salt outlet of the steam molten salt heat exchanger (11) and the high temperature molten salt storage tank (15).
7. A thermal power plant thermal re-melting salt heat storage system according to claim 3, characterized in that the unit water supply pipe (23) is provided with a water supply valve (18);
a steam outlet of the molten salt steam heat exchanger (19) is provided with a steam supply valve II (20);
The inlet of the hot re-steam (21) of the steam molten salt heat exchanger (11) is provided with a reheater hot section steam extraction and supply valve (10).
8. A thermal power plant hot remelting salt heat storage system according to claim 3, characterized in that the steam outlet of the steam molten salt heat exchanger (11) is provided with a temperature and pressure reducer (12) and a steam supply valve one (13).
9. A thermal power plant hot remelting salt heat storage system according to claim 3, characterized in that the outlet of the low temperature molten salt storage tank (14) is provided with a low temperature molten salt pump (16);
The outlet of the high-temperature molten salt storage tank (15) is provided with a high-temperature molten salt pump (17).
10. A thermal power plant thermal re-melt salt heat storage system as set forth in claim 3, further comprising:
A generator (6) connected to the main turbine;
The main return pipeline is sequentially provided with a low-pressure heater (7), a deaerator (8) and a high-pressure heater (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420546279.2U CN222230516U (en) | 2024-03-20 | 2024-03-20 | A thermal remelting salt heat storage system for thermal power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420546279.2U CN222230516U (en) | 2024-03-20 | 2024-03-20 | A thermal remelting salt heat storage system for thermal power plants |
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| CN222230516U true CN222230516U (en) | 2024-12-24 |
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| CN202420546279.2U Active CN222230516U (en) | 2024-03-20 | 2024-03-20 | A thermal remelting salt heat storage system for thermal power plants |
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