CN118346392A - Secondary reheating unit peak regulation system utilizing bypass heat accumulation - Google Patents
Secondary reheating unit peak regulation system utilizing bypass heat accumulation Download PDFInfo
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- CN118346392A CN118346392A CN202410516557.4A CN202410516557A CN118346392A CN 118346392 A CN118346392 A CN 118346392A CN 202410516557 A CN202410516557 A CN 202410516557A CN 118346392 A CN118346392 A CN 118346392A
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- 238000003303 reheating Methods 0.000 title claims abstract description 31
- 238000009825 accumulation Methods 0.000 title claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 178
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000005338 heat storage Methods 0.000 claims abstract description 40
- 230000001105 regulatory effect Effects 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 24
- 230000006837 decompression Effects 0.000 claims description 9
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Abstract
The invention relates to a peak shaving system of a secondary reheating unit utilizing bypass heat storage, which comprises the following components: a heat storage device and a turbine unit; the heat storage device comprises a high-temperature molten salt tank, a high-temperature molten salt pump, a high-temperature molten salt shut-off valve, a molten salt water supply heat exchanger, a low-temperature molten salt tank, a low-temperature molten salt pump, a low-temperature molten salt shut-off valve and a molten salt steam heat exchanger group which are connected in sequence; the steam side inlet of the fused salt steam heat exchanger group is connected with the steam turbine group through a bypass pipeline. Compared with the prior art, the peak regulation technology of the thermal power generating unit based on steam heating fused salt heat accumulation aims at the secondary reheating unit, the boiler and the turbine body do not need to be modified, and only one fused salt heat accumulation and release system is needed to be additionally arranged outside, so that energy integration can be realized, and the peak regulation capacity and flexibility of an energy system are improved.
Description
Technical Field
The invention relates to a peak shaving system of a secondary reheating unit, in particular to a peak shaving system of a secondary reheating unit utilizing bypass heat accumulation.
Background
Along with the continuous increase of the power generation proportion of the fluctuation renewable energy sources, the operation mode of the generator set is gradually changed from the basic load bearing operation to the deep peak shaving operation, and the load change is frequent. The operation target of the thermal power unit is changed from pursuing high-efficiency energy conservation to focusing on the flexibility of the lifting unit, the unit depth peak shaving and the quick start-stop capability. The method is also a development trend of running of the coal motor unit in the future in China. In order to meet the stability of the load and frequency response of the power grid system and improve the digestion capacity of the new energy system, the coal-fired power plant must improve the operation flexibility.
The existing thermal power generating unit peak regulating unit has very limited depth peak regulating capability and overload capability, cannot meet the increase of peak regulating pressure of an electric power system, and needs to improve the peak regulating capability and flexibility of the thermal power generating unit.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the peak shaving system of the secondary reheating unit by utilizing bypass heat accumulation, the peak shaving technology of the thermal power unit by utilizing steam to heat molten salt heat accumulation does not need to modify a boiler and a turbine body, and only one set of molten salt heat accumulation and release system is needed to be additionally arranged outside, so that energy integration can be realized, and the peak shaving capacity and flexibility of the energy system are improved.
The aim of the invention can be achieved by the following technical scheme:
The invention provides a peak shaving system of a secondary reheating unit utilizing bypass heat storage, which comprises the following components: a heat storage device and a turbine unit;
The heat storage device comprises a high-temperature molten salt tank, a high-temperature molten salt pump, a high-temperature molten salt shut-off valve, a molten salt water supply heat exchanger, a low-temperature molten salt tank, a low-temperature molten salt pump, a low-temperature molten salt shut-off valve and a molten salt steam heat exchanger group which are connected in sequence;
The steam side inlet of the fused salt steam heat exchanger group is connected with the steam turbine group through a bypass pipeline.
Further, the low-temperature molten salt tank is used for storing low-temperature molten salt, a low-temperature molten salt shutoff valve is opened in the heat storage process, the low-temperature molten salt stored in the low-temperature molten salt tank enters a molten salt steam heat exchanger group to absorb heat of bypass steam, and the low-temperature molten salt enters a high-temperature molten salt tank for storage after temperature rising;
The high-temperature molten salt tank is used for storing high-temperature molten salt, the high-temperature molten salt shutoff valve is opened in the heat release process, and the high-temperature molten salt stored in the high-temperature molten salt tank enters the molten salt water supply heat exchanger to heat boiler water, and enters the low-temperature molten salt tank for storage after temperature reduction.
Further, the fused salt steam heat exchanger group includes three parallelly connected fused salt steam heat exchangers, and the fused salt steam heat exchanger includes: molten salt steam heat exchanger A, molten salt steam heat exchanger B, molten salt steam heat exchanger C, the low temperature molten salt reposition of redundant personnel that comes out from low temperature molten salt jar gets into three molten salt steam heat exchanger, and the low temperature molten salt absorbs steam heat after, merges again and gets into high temperature molten salt jar.
Further, in the heat storage process, the low-temperature molten salt flow rate fed into the molten salt steam heat exchanger A is regulated by the low-temperature molten salt flow regulating valve A at the molten salt side inlet of the molten salt steam heat exchanger A, the low-temperature molten salt flow rate fed into the molten salt steam heat exchanger B is regulated by the low-temperature molten salt flow regulating valve B at the molten salt side inlet of the molten salt steam heat exchanger B, and the low-temperature molten salt flow rate fed into the molten salt steam heat exchanger C is regulated by the low-temperature molten salt flow regulating valve C at the molten salt side inlet of the molten salt steam heat exchanger C.
Further, a steam side inlet of the fused salt steam heat exchanger A is connected with a first bypass pipeline on a steam inlet pipeline of the ultrahigh pressure cylinder of the steam turbine, and a steam side outlet of the fused salt steam heat exchanger A is connected with a primary cold reheat steam pipeline;
In the heat storage process, part of superheated steam from a boiler superheater is decompressed through a decompression valve A, is sent into a fused salt steam heat exchanger A to heat low-temperature fused salt, and enters a primary cold reheat steam pipeline after the temperature of the superheated steam is reduced; the surplus superheated steam from the boiler superheater is conveyed to a turbine ultrahigh pressure cylinder to push the turbine ultrahigh pressure cylinder to do work, exhaust steam of the turbine ultrahigh pressure cylinder is conveyed to a primary cold reheat steam pipeline, and the primary cold reheat steam pipeline conveys outlet steam of the fused salt steam heat exchanger A and outlet steam of the turbine ultrahigh pressure cylinder to a boiler primary reheater.
Further, a steam side inlet of the fused salt steam heat exchanger B is connected with a second bypass pipeline on a steam inlet pipeline of a high-pressure cylinder of the steam turbine, and a steam side outlet of the fused salt steam heat exchanger B is connected with a secondary cold reheat steam pipeline;
in the heat storage process, part of primary reheating steam from a boiler primary reheater is decompressed through a decompression valve B, is sent into a fused salt steam heat exchanger B to heat low-temperature fused salt, and is sent into a secondary cold reheating steam pipeline after the temperature of the primary reheating steam is reduced; the residual primary reheating steam from the boiler primary reheater is conveyed to a turbine high-pressure cylinder to push the turbine high-pressure cylinder to do work, exhaust steam of the turbine high-pressure cylinder is conveyed to a secondary cold reheating steam pipeline, and the secondary cold reheating steam pipeline conveys outlet steam of the fused salt steam heat exchanger B and outlet steam of the turbine high-pressure cylinder to the boiler secondary reheater.
Further, a steam side inlet of the fused salt steam heat exchanger C is connected with a bypass pipeline on a steam inlet pipeline of a middle pressure cylinder of the steam turbine, and a steam side outlet of the fused salt steam heat exchanger C is connected with a condenser;
In the heat accumulation process, part of the secondary reheating steam from the boiler secondary reheater is decompressed through a decompression valve C, is sent into a fused salt steam heat exchanger C to heat low-temperature fused salt, is sent into a condenser after the temperature of the secondary reheating steam is reduced, and the rest of the secondary reheating steam from the boiler secondary reheater is sent into a turbine medium-pressure cylinder to push the turbine medium-pressure cylinder to do work.
Further, in the heat storage process, the superheated steam flow sent into the molten salt steam heat exchanger A is regulated by a superheated steam flow regulating valve at the steam side inlet of the molten salt steam heat exchanger A, the primary reheat steam flow sent into the molten salt steam heat exchanger B is regulated by a primary reheat steam flow regulating valve at the steam side inlet of the molten salt steam heat exchanger B, and the secondary reheat steam flow sent into the molten salt steam heat exchanger C is regulated by a secondary reheat steam flow regulating valve at the steam side inlet of the molten salt steam heat exchanger C.
Further, in the exothermic process, the flow rate of the high-temperature molten salt fed into the molten salt feed water heat exchanger is regulated by a high-temperature molten salt flow regulating valve at the molten salt side inlet of the molten salt feed water heat exchanger.
Further, an inlet of the water side of the molten salt water supply heat exchanger is connected with an outlet of a water supply pump, and an outlet of the water side of the molten salt water supply heat exchanger is connected with a water supply pipeline of the boiler;
In the heat release process, a first shutoff valve on a pipeline of a water supply pump outlet leading to the high-pressure heater is closed, a second shutoff valve on a pipeline leading to the molten salt water supply heat exchanger is opened, and the water in the water storage tank is sent into the molten salt water supply heat exchanger by the water supply pump to be heated and then is sent into the boiler economizer.
Compared with the prior art, the invention has the following advantages:
The invention improves the peak regulation capacity and flexibility of the thermal power generating unit. The system benefits from a fused salt-steam heat exchanger three-parallel structure, part of main steam, primary reheat steam and secondary reheat steam can be extracted simultaneously as high-temperature heat sources in the heat storage process, when the part of main steam, the primary reheat steam and the secondary reheat steam are extracted as high-temperature heat sources, the flow of a boiler reheater is not excessively reduced, the problem of the lowest stable combustion load constraint of the boiler is solved, compared with the existing scheme, the turbine ultrahigh pressure cylinder and the high pressure cylinder do less work, the part of secondary reheat steam is extracted simultaneously as the high-temperature heat sources, the steam enters the condenser after heat storage, the steam inlet quantity of the middle pressure cylinder and the low pressure cylinder of the turbine can be simultaneously reduced, and the power generation power is reduced. And in the heat release process, the water fed by the high-pressure heater fully enters the heat storage system for heat storage and then enters the boiler economizer, and the steam is extracted by the high-pressure heater to quickly perform peak operation.
Drawings
Fig. 1 is a schematic diagram of a secondary reheat unit peak shaving system utilizing bypass heat storage.
Reference numerals: 4. a water storage tank; 5. a water feed pump; 6. a first shut-off valve; 7. a high pressure heater; 9. a high temperature salt melting tank; 10. a low-temperature salt melting tank; 11. a low temperature molten salt pump; 12. a high temperature molten salt pump; 16. a low temperature molten salt shutoff valve; 17. a secondary cold reheat steam line; 18. a primary cold reheat steam line; 19. a boiler feed water pipe; 21. an ultrahigh pressure cylinder of the steam turbine; 22-a turbine high-pressure cylinder; 23. a turbine intermediate pressure cylinder; 24. a high temperature molten salt shutoff valve; 1-1, a steam inlet pipeline of a turbine ultrahigh pressure cylinder; 1-2, a first bypass pipeline; 1-3, a superheated steam flow regulating valve; 2-1, a steam inlet pipeline of a high-pressure cylinder of a steam turbine; 2-2, a second bypass pipeline; 2-3, a primary reheat steam flow regulating valve; 3-1, a steam inlet pipeline of a middle pressure cylinder of the steam turbine; 3-2, a third bypass duct; 3-3, a double reheat steam flow regulating valve; 13-1, a molten salt-steam heat exchanger A;13-2, a pressure reducing valve A;13-3, a low-temperature molten salt flow regulating valve A;14-1, a molten salt-steam heat exchanger B;14-2, a pressure reducing valve B;14-3, a low-temperature molten salt flow regulating valve B;15-1, a molten salt-steam heat exchanger C;15-2, a pressure reducing valve C;15-3, a low-temperature molten salt flow regulating valve C;20-1, a molten salt-feedwater heat exchanger; 20-2, a second shut-off valve; 20-3, a high-temperature molten salt flow regulating valve.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. Features such as a part model, a material name, a connection structure, a control method, an algorithm and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art.
Example 1
The embodiment provides a peak shaving system of a secondary reheating unit using bypass heat storage, as shown in fig. 1, including: a heat storage device and a turbine unit;
The heat storage device comprises a high-temperature molten salt tank 9, a high-temperature molten salt pump 12, a high-temperature molten salt shutoff valve 24, a molten salt-water supply heat exchanger 20-1, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a low-temperature molten salt shutoff valve 16 and a molten salt-steam heat exchanger group which are connected in sequence;
the steam side inlet of the fused salt-steam heat exchanger group is connected with the steam turbine group through a bypass pipeline.
In a specific embodiment, the low-temperature molten salt tank 10 is used for storing low-temperature molten salt, the low-temperature molten salt shutoff valve 16 is opened in the heat storage process, the low-temperature molten salt stored in the low-temperature molten salt tank 10 enters the molten salt-steam heat exchanger group to absorb the heat of bypass steam, and the low-temperature molten salt enters the high-temperature molten salt tank 9 for storage after being heated;
The high-temperature molten salt tank 9 is used for storing high-temperature molten salt, the high-temperature molten salt shutoff valve 24 is opened in the heat release process, and the high-temperature molten salt stored in the high-temperature molten salt tank 9 enters the molten salt-water supply heat exchanger 20-1 to heat boiler water supply, and enters the low-temperature molten salt tank 10 to store after temperature reduction.
In a specific embodiment, the molten salt-steam heat exchanger set comprises three molten salt-steam heat exchangers connected in parallel, the molten salt-steam heat exchanger comprising: the molten salt-steam heat exchanger A13-1, the molten salt-steam heat exchanger B14-1 and the molten salt-steam heat exchanger C15-1, the low-temperature molten salt from the low-temperature molten salt tank 10 is split into three molten salt-steam heat exchangers, and the low-temperature molten salt absorbs steam heat and then is converged into the high-temperature molten salt tank 9.
In a specific embodiment, in the heat storage process, the flow rate of the low-temperature molten salt fed into the molten salt-steam heat exchanger A13-1 is regulated by a low-temperature molten salt flow regulating valve A13-3 at a molten salt side inlet of the molten salt-steam heat exchanger A13-1, the flow rate of the low-temperature molten salt fed into the molten salt-steam heat exchanger B14-1 is regulated by a low-temperature molten salt flow regulating valve B14-3 at a molten salt side inlet of the molten salt-steam heat exchanger B14-1, and the flow rate of the low-temperature molten salt fed into the molten salt-steam heat exchanger C15-1 is regulated by a low-temperature molten salt flow regulating valve C15-3 at a molten salt side inlet of the molten salt-steam heat exchanger C15-1.
In a specific embodiment, a steam side inlet of the fused salt-steam heat exchanger A13-1 is connected with a first bypass pipeline 1-2 on a steam turbine ultrahigh pressure cylinder steam inlet pipeline 1-1, and a steam side outlet of the fused salt-steam heat exchanger A13-1 is connected with a primary cold reheat steam pipeline 18;
In the heat storage process, part of superheated steam from a boiler superheater is decompressed through a decompression valve A13-2, is sent into a fused salt-steam heat exchanger A13-1 to heat low-temperature fused salt, and enters a primary cold reheat steam pipeline 18 after the temperature of the superheated steam is reduced; the surplus superheated steam from the boiler superheater is conveyed to a turbine ultrahigh pressure cylinder 21 to push the turbine ultrahigh pressure cylinder 21 to do work, the exhaust steam of the turbine ultrahigh pressure cylinder 21 is conveyed to a primary cold reheat steam pipeline 18, and the primary cold reheat steam pipeline 18 conveys the outlet steam of the fused salt-steam heat exchanger A13-1 and the outlet steam of the turbine ultrahigh pressure cylinder 21 to the boiler primary reheater.
In a specific embodiment, a steam side inlet of the fused salt-steam heat exchanger B14-1 is connected with a second bypass pipeline 2-2 on a steam inlet pipeline 2-1 of the high-pressure cylinder of the steam turbine, and a steam side outlet of the fused salt-steam heat exchanger B14-1 is connected with a secondary cold reheat steam pipeline 17;
In the heat storage process, part of primary reheat steam from a boiler primary reheater is decompressed through a decompression valve B14-2, is sent into a fused salt-steam heat exchanger B14-1 to heat low-temperature fused salt, and is sent into a secondary cold reheat steam pipeline 17 after the temperature of the primary reheat steam is reduced; the residual primary reheating steam from the boiler primary reheater is conveyed to the turbine high-pressure cylinder 22 to push the turbine high-pressure cylinder 22 to do work, the exhaust steam of the turbine high-pressure cylinder 22 is conveyed to the secondary cold reheating steam pipeline 17, and the secondary cold reheating steam pipeline 17 conveys the outlet steam of the fused salt-steam heat exchanger B14-1 and the outlet steam of the turbine high-pressure cylinder 22 to the boiler secondary reheater.
In a specific embodiment, a steam side inlet of the fused salt-steam heat exchanger C15-1 is connected with a bypass pipeline 3-2 on a steam inlet pipeline 3-1 of a medium pressure cylinder of the steam turbine, and a steam side outlet of the fused salt-steam heat exchanger C15-1 is connected with a condenser;
In the heat accumulation process, part of the secondary reheat steam from the boiler secondary reheater is decompressed through a decompression valve C15-2, is sent into a fused salt-steam heat exchanger C15-1 to heat low-temperature fused salt, is sent into a condenser after the temperature of the secondary reheat steam is reduced, and the rest of the secondary reheat steam from the boiler secondary reheater is sent into a turbine intermediate pressure cylinder 23 to push the turbine intermediate pressure cylinder to do work.
In a specific embodiment, in the heat storage process, the superheated steam flow rate fed into the molten salt-steam heat exchanger A13-1 is regulated by the superheated steam flow regulating valve 1-3 at the steam side inlet of the molten salt-steam heat exchanger A13-1, the primary reheat steam flow rate fed into the molten salt-steam heat exchanger B14-1 is regulated by the primary reheat steam flow regulating valve 2-3 at the steam side inlet of the molten salt-steam heat exchanger B14-1, and the secondary reheat steam flow rate fed into the molten salt-steam heat exchanger C15-1 is regulated by the secondary reheat steam flow regulating valve 3-3 at the steam side inlet of the molten salt-steam heat exchanger C15-1.
In a specific embodiment, in the exothermic process, the flow rate of the high-temperature molten salt fed into the molten salt-feed water heat exchanger 20-1 is regulated by the high-temperature molten salt flow regulating valve 20-3 of the molten salt side inlet of the molten salt-feed water heat exchanger 20-1.
In a specific embodiment, the inlet of the water side of the molten salt-water feeding heat exchanger 20-1 is connected with the outlet of the water feeding pump 5, and the outlet of the water side of the molten salt-water feeding heat exchanger 20-1 is connected with the boiler water feeding pipeline 19;
In the heat release process, a first shutoff valve 6 on a pipeline of an outlet of the water feed pump 5, which is communicated with the high-pressure heater 7, is closed, a second shutoff valve 20-2 on a pipeline, which is communicated with the molten salt-water feed heat exchanger 20-1, is opened, and the water in the water storage tank 4 is fed into the molten salt-water feed heat exchanger 20-1 by the water feed pump 5 to be heated and then is fed into the boiler economizer.
The components not described in detail in this embodiment are all existing components that can be purchased in public channels.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. The utility model provides an utilize secondary reheat unit peak regulation system of bypass heat accumulation which characterized in that includes: a heat storage device and a turbine unit;
The heat storage device comprises a high-temperature molten salt tank (9), a high-temperature molten salt pump (12), a high-temperature molten salt shutoff valve (24), a molten salt-water heat exchanger (20-1), a low-temperature molten salt tank (10), a low-temperature molten salt pump (11), a low-temperature molten salt shutoff valve (16) and a molten salt-steam heat exchanger group which are connected in sequence;
And a steam side inlet of the fused salt-steam heat exchanger group is connected with the steam turbine group through a bypass pipeline.
2. The peak shaving system of the secondary reheating unit utilizing bypass heat storage according to claim 1, wherein the low-temperature molten salt tank (10) is used for storing low-temperature molten salt, a low-temperature molten salt shutoff valve (16) is opened in the heat storage process, the low-temperature molten salt stored in the low-temperature molten salt tank (10) enters a molten salt-steam heat exchanger group to absorb heat of bypass steam, and the heated low-temperature molten salt enters a high-temperature molten salt tank (9) to be stored;
the high-temperature molten salt tank (9) is used for storing high-temperature molten salt, a high-temperature molten salt shutoff valve (24) is opened in the heat release process, and the high-temperature molten salt stored in the high-temperature molten salt tank (9) enters a molten salt-water supply heat exchanger (20-1) to heat boiler water supply, and enters a low-temperature molten salt tank (10) to store after the temperature is reduced.
3. The secondary reheat unit peak shaving system utilizing bypass heat storage as set forth in claim 1, wherein the molten salt-steam heat exchanger group includes three parallel molten salt-steam heat exchangers, the molten salt-steam heat exchangers including: the molten salt-steam heat exchanger A (13-1), the molten salt-steam heat exchanger B (14-1) and the molten salt-steam heat exchanger C (15-1) are characterized in that low-temperature molten salt from the low-temperature molten salt tank (10) is split into three molten salt-steam heat exchangers, and the low-temperature molten salt absorbs steam heat and then is converged into the high-temperature molten salt tank (9).
4. A secondary reheat unit peak shaving system using bypass heat storage as set forth in claim 3, wherein in the heat storage process, the flow rate of low-temperature molten salt fed into the molten salt-steam heat exchanger a (13-1) is regulated by the low-temperature molten salt flow regulating valve a (13-3) of the molten salt side inlet of the molten salt-steam heat exchanger a (13-1), the flow rate of low-temperature molten salt fed into the molten salt-steam heat exchanger B (14-1) is regulated by the low-temperature molten salt flow regulating valve B (14-3) of the molten salt side inlet of the molten salt-steam heat exchanger B (14-1), and the flow rate of low-temperature molten salt fed into the molten salt-steam heat exchanger C (15-1) is regulated by the low-temperature molten salt flow regulating valve C (15-3) of the molten salt side inlet of the molten salt-steam heat exchanger C (15-1).
5. A secondary reheat unit peak shaving system using bypass heat storage as set forth in claim 3, wherein the steam side inlet of said molten salt-steam heat exchanger a (13-1) is connected to a first bypass pipe (1-2) on the steam turbine ultra high pressure cylinder steam inlet pipe (1-1), and the steam side outlet of said molten salt-steam heat exchanger a (13-1) is connected to a primary cold reheat steam pipe (18);
In the heat storage process, part of superheated steam from a boiler superheater is decompressed through a decompression valve A (13-2), is sent into a fused salt-steam heat exchanger A (13-1) to heat low-temperature fused salt, and enters a primary cold reheat steam pipeline (18) after the temperature of the superheated steam is reduced; the surplus superheated steam from the boiler superheater is conveyed to a turbine ultrahigh pressure cylinder (21) to push the turbine ultrahigh pressure cylinder (21) to do work, exhaust steam of the turbine ultrahigh pressure cylinder (21) is conveyed to a primary cold reheat steam pipeline (18), and the primary cold reheat steam pipeline (18) conveys outlet steam of a fused salt-steam heat exchanger A (13-1) and outlet steam of the turbine ultrahigh pressure cylinder (21) to a boiler primary reheater.
6. A secondary reheat unit peak shaving system using bypass heat storage as set forth in claim 3, wherein the steam side inlet of the molten salt-steam heat exchanger B (14-1) is connected to a second bypass pipe (2-2) on the high pressure cylinder steam inlet pipe (2-1) of the steam turbine, and the steam side outlet of the molten salt-steam heat exchanger B (14-1) is connected to a secondary cold reheat steam pipe (17);
In the heat storage process, part of primary reheat steam from a boiler primary reheater is decompressed through a decompression valve B (14-2), is sent into a fused salt-steam heat exchanger B (14-1) to heat low-temperature fused salt, and is sent into a secondary cold reheat steam pipeline (17) after the temperature of the primary reheat steam is reduced; the residual primary reheating steam from the boiler primary reheater is conveyed to a turbine high-pressure cylinder (22) to push the turbine high-pressure cylinder (22) to do work, exhaust steam of the turbine high-pressure cylinder (22) is conveyed to a secondary cold reheating steam pipeline (17), and the secondary cold reheating steam pipeline (17) conveys outlet steam of a fused salt-steam heat exchanger B (14-1) and outlet steam of the turbine high-pressure cylinder (22) to the boiler secondary reheater.
7. A secondary reheat unit peak shaving system using bypass heat storage as set forth in claim 3, wherein a steam side inlet of said molten salt-steam heat exchanger C (15-1) is connected to a bypass pipe (3-2) on a steam inlet pipe (3-1) of a medium pressure cylinder of a steam turbine, and a steam side outlet of said molten salt-steam heat exchanger C (15-1) is connected to a condenser;
In the heat accumulation process, part of the secondary reheat steam from the boiler secondary reheater is decompressed through a decompression valve C (15-2), is sent into a fused salt-steam heat exchanger C (15-1) to heat low-temperature fused salt, is sent into a condenser after the temperature of the secondary reheat steam is reduced, and is sent to a middle pressure cylinder (23) of a steam turbine to push the residual secondary reheat steam from the boiler secondary reheater to do work.
8. A secondary reheating unit peak conditioning system utilizing bypass heat storage according to claim 3, wherein during the heat storage, the superheated steam flow rate fed into the molten salt-steam heat exchanger a (13-1) is adjusted by the superheated steam flow rate adjusting valve (1-3) at the steam side inlet of the molten salt-steam heat exchanger a (13-1), the primary reheating steam flow rate fed into the molten salt-steam heat exchanger B (14-1) is adjusted by the primary reheating steam flow rate adjusting valve (2-3) at the steam side inlet of the molten salt-steam heat exchanger B (14-1), and the secondary reheating steam flow rate fed into the molten salt-steam heat exchanger C (15-1) is adjusted by the secondary reheating steam flow rate adjusting valve (3-3) at the steam side inlet of the molten salt-steam heat exchanger C (15-1).
9. The peak shaving system of a secondary reheating unit using bypass heat storage according to claim 1, wherein the flow rate of high temperature molten salt fed into the molten salt-feedwater heat exchanger (20-1) is regulated by a high temperature molten salt flow regulating valve (20-3) at a molten salt side inlet of the molten salt-feedwater heat exchanger (20-1) during heat release.
10. The secondary reheat unit peak shaving system utilizing bypass heat storage as set forth in claim 1, wherein an inlet of a water side of the molten salt-feedwater heat exchanger (20-1) is connected with an outlet of a feedwater pump (5), and an outlet of a water side of the molten salt-feedwater heat exchanger (20-1) is connected with a boiler feedwater pipe (19);
in the heat release process, a first shutoff valve (6) on a pipeline of an outlet of a water feed pump (5) leading to a high-pressure heater (7) is closed, a second shutoff valve (20-2) on a pipeline leading to a fused salt-water feed heat exchanger (20-1) is opened, and the water in a water storage tank (4) is fed into the fused salt-water feed heat exchanger (20-1) by the water feed pump (5) to be heated and then is fed into a boiler economizer.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118346392A true CN118346392A (en) | 2024-07-16 |
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