CN216049347U - Step heat storage system of fused salt coupling thermal power generating unit - Google Patents
Step heat storage system of fused salt coupling thermal power generating unit Download PDFInfo
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- CN216049347U CN216049347U CN202122651070.1U CN202122651070U CN216049347U CN 216049347 U CN216049347 U CN 216049347U CN 202122651070 U CN202122651070 U CN 202122651070U CN 216049347 U CN216049347 U CN 216049347U
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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
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- 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 utility model discloses a stepped heat storage system of a fused salt coupled thermal power generating unit, which is provided with a first fused salt heater and a second fused salt heater, wherein the first fused salt heater and the second fused salt heater are respectively used for gradually heating fused salt by using medium-exhaust steam extraction and heat re-steam extraction, and further storing heat by using the fused salt heater, so that the temperature of the fused salt is increased to 600 ℃ from 200 ℃, the heat storage mode is adjusted from the original completely-used electric heat storage mode to the mode of more-use high-temperature steam and less-use electric heat storage, the heat storage cost is reduced, the terminal product of a coal-fired power plant, namely electric energy, is completely utilized, is converted into more-use intermediate products, namely medium-exhaust steam extraction and heat re-steam extraction, and the economy of fused salt storage and heat release circulation operation can be greatly improved in the long term. Meanwhile, in the heat storage process, part of the exhausted steam and the hot re-steam of the intermediate pressure cylinder do not enter the low pressure cylinder and the intermediate pressure cylinder to do work, so that the generated energy of the unit is reduced, and the purpose of quickly reducing the load is achieved.
Description
Technical Field
The utility model belongs to the technical field of molten salt heat storage, and particularly relates to a stepped heat storage system of a molten salt coupled thermal power generating unit.
Background
Under the background that the problems of environmental pollution and energy crisis are increasingly prominent, the realization of large-scale utilization of renewable energy sources and the improvement of energy utilization efficiency have become the focus of global common attention. Through the energy storage technology, the consumption capacity of new energy power generation can be improved, the comprehensive utilization efficiency of energy can be improved, peak clipping and valley filling are realized, and the cascade utilization of the energy is really realized. The heat storage technology has the advantages of large energy storage capacity, long storage period, low cost, safe and reliable operation, no pollution emission and the like, and is expected to meet large development space and opportunities in the aspects of clean heat supply, thermal power peak regulation, clean energy consumption and the like under the double-carbon targets of 2030 and 2060. The fused salt heat storage technology has flexible heat storage mode, is the first choice of the large-scale medium-high temperature heat storage technology at present, and is an important technology for improving the power generation proportion of clean energy and promoting haze treatment. The fused salt material has the advantages of 'four high three low', so that the heat storage system has the advantages of wide application range, environmental protection, safety, stability and the like, and has wide application and development prospects in the fields of solar power generation, waste heat recovery, heating, thermal power flexibility transformation and the like.
The molten salt used in engineering is usually a molten liquid salt, is an ideal heat storage medium, and has a stable working temperature of 200-600 ℃. The molten salt energy storage technology utilizes nitrate and other raw materials as heat transfer media, stores and emits energy through conversion of heat energy of a heating molten salt heat source and internal energy of molten salt, and effective transfer of the energy is achieved.
At present, the conversion from low-temperature molten salt to high-temperature molten salt of a molten salt heat storage system mostly adopts electric heating, namely, the temperature of the molten salt is raised from 200 ℃ to 600 ℃ by fully utilizing electric energy, and an operation system is shown in figure 1. However, the electricity is used as the end product of the coal-fired power plant, and the cost is higher, so that the economical efficiency of the operation of the molten salt storage and heat release cycle is lower.
Disclosure of Invention
The utility model aims to reduce the cost of molten salt heat storage, improve the economy of molten salt heat storage and release cycle operation, change the electric energy mostly adopted by a molten salt heating heat source at present into high-temperature steam with different qualities and different parameter levels, realize stable cycle flow of molten salt at 200-600 ℃, efficiently complete heat storage and release cycles, and provide a stepped heat storage system of a molten salt coupled thermal power generating unit.
In order to achieve the purpose, the low-temperature molten salt heat pump system comprises a low-temperature molten salt tank, wherein a molten salt outlet of the low-temperature molten salt tank is connected with a first molten salt heater, the first molten salt heater is connected with a second molten salt heater, the second molten salt heater is connected with an electric molten salt heater, steam is exhausted in the first molten salt heater connection to serve as a heat source, the second molten salt heater is connected with heat re-extraction steam to serve as a heat source, a heat source outlet after heat exchange in the first molten salt heater is connected with a first steam heat exchanger through a pipeline, a heat source outlet after heat exchange in the second molten salt heater is connected with a second steam heat exchanger through a pipeline, and heat source outlets of the first steam heat exchanger and the second steam heat exchanger are respectively connected with a condenser through corresponding pipelines.
The electric molten salt heater is connected with the high-temperature molten salt tank, the high-temperature molten salt tank is connected with the heat supply station, and the heat supply station is connected with the low-temperature molten salt tank.
A first booster pump is arranged on a pipeline between the low-temperature molten salt tank and the first molten salt heater, and a second booster pump is arranged on a pipeline between the high-temperature molten salt tank and the heat supply station.
And a condensed water outlet of the condenser is connected with the low-pressure heater group and the first steam heat exchanger, the first steam heat exchanger is connected with the second steam heat exchanger, and the second steam heat exchanger and the low-pressure heater group are both connected with the deaerator.
And a condensate pump is arranged on a pipeline of the condenser, which is connected with the low-pressure heater group and the first steam heat exchanger.
And a stop valve is arranged on a pipeline of the condenser connected with the first steam heat exchanger.
And a first pressure reducing valve and a second pressure reducing valve are respectively arranged on pipelines of the first steam heat exchanger and the second steam heat exchanger which are connected with the condenser.
Compared with the prior art, the utility model is provided with the first molten salt heater and the second molten salt heater, the molten salt is gradually heated by utilizing the medium-exhaust steam extraction and the heat re-steam extraction respectively, the molten salt is further stored by utilizing the molten salt heater, the temperature of the molten salt is raised to 600 ℃ from 200 ℃, the heat storage mode is adjusted from the original completely-used electric heat storage mode to the mode of more-used high-temperature steam and less-used electric heat storage, the terminal product of the coal-fired power plant, namely electric energy, is completely utilized to be converted into a more-utilized intermediate product, namely the medium-exhaust steam extraction and the heat re-steam extraction, the heat storage cost is reduced, and the economical efficiency of the circulating operation of the molten salt storage and the heat release can be greatly improved in the long term. Meanwhile, in the heat storage process, part of the exhausted steam and the hot re-steam of the intermediate pressure cylinder do not enter the low pressure cylinder and the intermediate pressure cylinder to do work, so that the generated energy of the unit is reduced, and the purpose of quickly reducing the load is achieved.
Drawings
FIG. 1 is a prior art system diagram;
FIG. 2 is a block diagram of the system of the present invention;
the system comprises a first molten salt heater, a second molten salt heater, a third molten salt heater, a fourth molten salt heater, a fifth molten salt tank, a sixth molten salt station, a sixth booster pump, a sixth steam heat exchanger, a sixth steam condenser, a sixth condensate pump, a sixth low-pressure heater, a sixth deaerator, a sixth stop valve, a sixth relief valve, a sixth steam heat exchanger, a sixth relief valve, a fourth relief valve, a sixth relief valve, a fourth relief valve, a sixth relief valve, a fourth relief valve, a sixth relief valve, a fourth relief valve, a sixth relief valve, a fourth relief valve, a.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 2, the low-temperature molten salt heating system comprises a low-temperature molten salt tank 4, wherein a molten salt outlet of the low-temperature molten salt tank 4 is connected with a first molten salt heater 1, the first molten salt heater 1 is connected with a second molten salt heater 2, the second molten salt heater 2 is connected with an electric molten salt heater 3, the electric molten salt heater 3 is connected with a high-temperature molten salt tank 5, the high-temperature molten salt tank 5 is connected with a heat supply station 6, and the heat supply station 6 is connected with the low-temperature molten salt tank 4. A first booster pump 7 is arranged on a pipeline between the low-temperature molten salt tank 4 and the first molten salt heater 1, and a second booster pump 8 is arranged on a pipeline between the high-temperature molten salt tank 5 and the heat supply station 6.
The method comprises the following steps that extraction steam is discharged in the connection of a first molten salt heater 1 and is used as a heat source, a second molten salt heater 2 is connected with heat re-extraction steam and is used as a heat source, a heat source outlet after heat exchange in the first molten salt heater 1 is connected with a first steam heat exchanger 9 through a pipeline, a heat source outlet after heat exchange in the second molten salt heater 2 is connected with a second steam heat exchanger 10 through a pipeline, and heat source outlets of the first steam heat exchanger 9 and the second steam heat exchanger 10 are respectively connected with a condenser 11 through corresponding pipelines. The pipelines of the first steam heat exchanger 9 and the second steam heat exchanger 10 connected with the condenser 11 are respectively provided with a first pressure reducing valve 16 and a second pressure reducing valve 17. A condensed water outlet of the condenser 11 is connected with a low-pressure heater group 13 and a first steam heat exchanger 9, the first steam heat exchanger 9 is connected with a second steam heat exchanger 10, and the second steam heat exchanger 10 and the low-pressure heater group 13 are both connected with a deaerator 14. A condensate pump 12 is arranged on a pipeline of the condenser 11, which is connected with the low-pressure heater group 13 and the first steam heat exchanger 9. A stop valve 15 is arranged on a pipeline of the condenser 11 connected with the first steam heat exchanger 9.
The working method of the utility model comprises the following steps:
in the process of storing heat in molten salt, low-temperature molten salt (about 200 ℃) in a low-temperature molten salt tank 4 sequentially passes through a first molten salt heater 1 and a second molten salt heater 2, and then is sent into an electric molten salt heater 3 for heating; the molten salt heated by the electric molten salt heater 3 becomes high-temperature molten salt (600 ℃) and is stored in the high-temperature molten salt tank 5.
The heat source in the first molten salt heater 1 is middle-exhaust steam extraction, the steam enters the first steam heat exchanger 9 after heat storage through molten salt, and the drained water after heat exchange is discharged into the condenser 11;
the heat source of the second molten salt heater 2 is heat with the temperature higher than that of the middle exhaust steam extraction, the heat is stored through the molten salt and then enters the second steam heat exchanger 10, and the drain water after heat exchange is discharged into the condenser 11.
The condensed water by-passed by the low-pressure heater group 13 passes through the first steam heat exchanger 9 and the second steam heat exchanger 10 in sequence and is sent to the deaerator 14 together with the condensed water of the low-pressure heater group 13.
Claims (7)
1. The utility model provides a fused salt coupling thermal power generating unit step heat-retaining system, a serial communication port, including low temperature fused salt jar (4), the fused salt exit linkage first fused salt heater (1) of low temperature fused salt jar (4), second fused salt heater (2) are connected in first fused salt heater (1), fused salt heater (3) are connected in second fused salt heater (2), the steam extraction is as the heat source in first fused salt heater (1) is connected, second fused salt heater (2) are connected heat and are taken out the steam as the heat source again, the heat source export after the heat transfer passes through tube coupling first steam heat exchanger (9) in first fused salt heater (1), the heat source export after the heat transfer passes through tube coupling second steam heat exchanger (10) in second fused salt heater (2), the heat source export of first steam heat exchanger (9) and second steam heat exchanger (10) is respectively through corresponding tube coupling condenser (11).
2. The molten salt coupling thermal power generating unit step heat storage system according to claim 1, wherein the electric molten salt heater (3) is connected with the high-temperature molten salt tank (5), the high-temperature molten salt tank (5) is connected with the heat supply station (6), and the heat supply station (6) is connected with the low-temperature molten salt tank (4).
3. The molten salt coupling thermal power generating unit cascade heat storage system according to claim 1, wherein a first booster pump (7) is arranged on a pipeline between the low-temperature molten salt tank (4) and the first molten salt heater (1), and a second booster pump (8) is arranged on a pipeline between the high-temperature molten salt tank (5) and the heat supply station (6).
4. The molten salt coupling thermal power generating unit step heat storage system according to claim 1, wherein a condensed water outlet of a condenser (11) is connected with a low-pressure heater group (13) and a first steam heat exchanger (9), the first steam heat exchanger (9) is connected with a second steam heat exchanger (10), and the second steam heat exchanger (10) and the low-pressure heater group (13) are both connected with a deaerator (14).
5. The molten salt coupling thermal power generating unit step heat storage system according to claim 4, wherein a condensate pump (12) is arranged on a pipeline of the condenser (11) connecting the low-pressure heater group (13) and the first steam heat exchanger (9).
6. The molten salt coupling thermal power generating unit step heat storage system according to claim 4, wherein a stop valve (15) is arranged on a pipeline connecting the condenser (11) and the first steam heat exchanger (9).
7. The molten salt coupling thermal power generating unit cascade heat storage system according to claim 1, wherein a first pressure reducing valve (16) and a second pressure reducing valve (17) are respectively arranged on pipelines of the first steam heat exchanger (9) and the second steam heat exchanger (10) connected with the condenser (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122651070.1U CN216049347U (en) | 2021-11-01 | 2021-11-01 | Step heat storage system of fused salt coupling thermal power generating unit |
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| CN202122651070.1U CN216049347U (en) | 2021-11-01 | 2021-11-01 | Step heat storage system of fused salt coupling thermal power generating unit |
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| CN216049347U true CN216049347U (en) | 2022-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812247A (en) * | 2022-04-27 | 2022-07-29 | 华北电力大学 | High-flexibility coal-fired power generation system with coupled heat storage |
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2021
- 2021-11-01 CN CN202122651070.1U patent/CN216049347U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812247A (en) * | 2022-04-27 | 2022-07-29 | 华北电力大学 | High-flexibility coal-fired power generation system with coupled heat storage |
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