CN216278054U - Molten salt heat storage and steam supply system for supplying black start power supply - Google Patents
Molten salt heat storage and steam supply system for supplying black start power supply Download PDFInfo
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- CN216278054U CN216278054U CN202122813505.8U CN202122813505U CN216278054U CN 216278054 U CN216278054 U CN 216278054U CN 202122813505 U CN202122813505 U CN 202122813505U CN 216278054 U CN216278054 U CN 216278054U
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Abstract
The utility model discloses a fused salt heat and steam storage and supply system for supplying a black start power supply. Compared with the traditional electric heating heat storage system, the multi-stage conversion from steam heat energy to electric energy to molten salt heat energy is avoided, and the system operation efficiency is improved. The molten salt heat storage system transfers the stored heat energy to steam through the steam generator, and is used for supplying steam to external industry or serving as a power source to drive a steam turbine generator unit to operate. The generated energy of the turbo generator unit can be merged into a station service power end through a station service transformer to drive an auxiliary engine in the starting process to operate, the power supply of the power plant for black start is realized, and the problem of black start of the power plant in isolated network operation can be effectively solved.
Description
Technical Field
The utility model belongs to the field of fused salt heat storage and steam supply, and particularly relates to a fused salt heat storage and steam supply system for supplying a black start power supply.
Background
The black start means that after the whole system has power failure due to failure, the set with the self-starting capability in the system is started in advance without depending on the help of a power supply outside the system, then the set without the self-starting capability is driven, the power supply range of the system is gradually expanded, and finally the process of recovering the power supply of the whole system is realized.
The black start capability of the coal-fired power plant is designed, so that the black start capability is not only a necessary measure for safe production and self rescue of the power plant under the condition of power loss of the whole plant, but also the requirement for reliable and stable operation of a power grid. Due to the high interconnection of the existing power grids and the influence of various uncertain factors, the major power failure accident of the power system is difficult to completely avoid. Therefore, how to rapidly recover self-rescue after system breakdown needs to be considered, so as to reduce economic loss and social turbulence caused by accidents.
When a black fault occurs, the coal-fired power plant generally meets the power demand of the service load of the black start plant by configuring a diesel generator set. However, the diesel generator set is only started during black start, so that the equipment utilization rate is low. And the diesel generator inevitably brings the problem of environmental pollution.
Disclosure of Invention
In order to achieve the purpose, the utility model provides a molten salt heat storage and steam supply system for supplying a black start power supply.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a fused salt heat storage and steam supply system for supplying black start power comprises a boiler, a steam outlet of the boiler is connected with a high pressure cylinder, a reheat steam outlet of the boiler is connected with a medium pressure cylinder through a pipeline, a steam outlet of the medium pressure cylinder is connected with a low pressure cylinder through a pipeline, the low pressure cylinder is connected with a first generator, the first generator is connected with a second generator, main transformer and station-service transformer, the reheat steam of boiler passes through the tube coupling fused salt heater as the heat source, reheat steam after the heat transfer passes through tube coupling steam-water heat exchanger among the fused salt heater, fused salt among the fused salt heater passes through the tube coupling high temperature molten salt jar, steam generator is connected to the high temperature molten salt jar, steam generator's fused salt export passes through the tube coupling low temperature molten salt jar, the fused salt heater is connected to the low temperature molten salt jar, steam generator connects the demineralized water source, steam generator's steam outlet passes through tube coupling steam turbine and industry steam supply export. The steam turbine is connected with the second generator.
The steam outlet of the low-pressure cylinder is connected with a condenser through a pipeline, the condenser is connected with a low-pressure heater group and a steam-water heat exchanger, the low-pressure heater group and the steam-water heat exchanger are both connected with a high-pressure heater group, the high-pressure heater group is connected with a boiler, and steam after heat exchange in the steam-water heat exchanger is connected with the inlet of the condenser through a pipeline.
A condensate pump is arranged at the lower stream of the condenser, a first valve is arranged between the condensate pump and the low-pressure heater group, a second valve is arranged between the condensate pump and the steam-water heat exchanger, and a water feed pump is arranged at the upper stream of the high-pressure heater group.
A high-temperature molten salt pump is arranged between the high-temperature molten salt tank and the steam generator, and a low-temperature molten salt pump is arranged between the low-temperature molten salt tank and the molten salt heater.
A first switch is arranged between the second generator and the main transformer, and a second switch is arranged between the second generator and the service transformer.
A third valve is arranged between the boiler and the molten salt heater.
A fourth valve is arranged between the steam generator and the industrial steam supply outlet, and a fifth valve is arranged between the steam generator and the steam turbine.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model utilizes the heat of the boiler to extract steam to heat the fused salt for heat storage, can effectively reduce the generating load of the unit and realize the peak shaving operation of the unit. Compared with the traditional electric heating heat storage system, the multi-stage conversion from steam heat energy to electric energy to molten salt heat energy is avoided, and the system operation efficiency is improved. The molten salt heat storage system transfers the stored heat energy to steam through the steam generator, and is used for supplying steam to external industry or serving as a power source to drive a steam turbine generator unit to operate. The generated energy of the turbo generator unit can be merged into a station service power end through a station service transformer to drive an auxiliary engine in the starting process to operate, the power supply of the power plant for black start is realized, and the problem of black start of the power plant in isolated network operation can be effectively solved.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic diagram of power supply of a main transformer and a service transformer according to the present invention;
the system comprises a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a first generator 5, a condenser 6, a condensate pump 7, a low-pressure heater group 8, a water feed pump 9, a high-pressure heater group 10, a steam-water heat exchanger 11, a first valve 12, a second valve 13, a third valve 14, a molten salt heater 15, a high-temperature molten salt tank 16, a high-temperature molten salt pump 17, a high-temperature molten salt generator 18, a low-temperature molten salt tank 19, a low-temperature molten salt pump 20, a steam turbine 21, a second generator 22, a fourth valve 23, a fifth valve 24, a main transformer 25, a plant transformer 26, a first switch 27 and a second switch 28.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the utility model comprises a boiler 1, a steam outlet of the boiler 1 is connected with a high pressure cylinder 2, a reheated steam outlet of the boiler 1 is connected with an intermediate pressure cylinder 3 through a pipeline, a steam outlet of the intermediate pressure cylinder 3 is connected with a low pressure cylinder 4 through a pipeline, the low pressure cylinder 4 is connected with a first generator 5, the first generator 5 is connected with a second generator 22, a main transformer 25 and a plant transformer 26, the reheated steam of the boiler 1 is used as a heat source and is connected with a molten salt heater 15 through a pipeline, and a third valve 14 is arranged between the boiler 1 and the molten salt heater 15. Reheat steam after the heat transfer passes through tube coupling soda heat exchanger 11 among the fused salt heater 15, fused salt among the fused salt heater 15 passes through tube coupling high temperature molten salt jar 16, high temperature molten salt jar 16 connects steam generator 18, steam generator 18's fused salt export passes through tube coupling low temperature molten salt jar 19, low temperature molten salt jar 19 connects fused salt heater 15, steam generator 18 connects the demineralized water source, steam generator 18's steam outlet passes through tube coupling steam turbine 21 and industry steam supply outlet, second generator 22 is connected to steam turbine 21. A first switch 27 is provided between the second generator 22 and the main transformer 25, and a second switch 28 is provided between the second generator 22 and the service transformer 26. A high-temperature molten salt pump 17 is arranged between the high-temperature molten salt tank 16 and the steam generator 18, and a low-temperature molten salt pump 20 is arranged between the low-temperature molten salt tank 19 and the molten salt heater 15. A fourth valve 23 is arranged between the steam generator 18 and the industrial steam supply outlet, and a fifth valve 24 is arranged between the steam generator 18 and the steam turbine 21.
The steam outlet of the low pressure cylinder 4 is connected with a condenser 6 through a pipeline, the condenser 6 is connected with a low pressure heater group 8 and a steam-water heat exchanger 11, the low pressure heater group 8 and the steam-water heat exchanger 11 are both connected with a high pressure heater group 10, the high pressure heater group 10 is connected with a boiler 1, and steam after heat exchange in the steam-water heat exchanger 11 is connected with the inlet of the condenser 6 through a pipeline. A condensate pump 7 is arranged on the downstream of the condenser 6, a first valve 12 is arranged between the condensate pump 7 and the low-pressure heater group 8, a second valve 13 is arranged between the condensate pump 7 and the steam-water heat exchanger 11, and a water feed pump 9 is arranged on the upstream of the high-pressure heater group 10.
The working method of the utility model comprises the following steps:
the new steam at the outlet of the boiler 1 enters the high pressure cylinder 2 to do work and then returns to the boiler 1 to be heated for the second time, and then enters the intermediate pressure cylinder 3 and the low pressure cylinder 4 in sequence to do work through expansion, so that the first generator 5 is driven to generate power. After entering the condenser 6 for condensation, the exhaust steam of the low-pressure cylinder 4 sequentially passes through the condensate pump 7, the low-pressure heater group 8, the feed pump 9 and the high-pressure heater group 10 and then returns to the boiler 1, and the steam-water circulation of the coal-fired power generating unit is completed.
When the molten salt heat storage system starts to store heat, the second valve 13 and the third valve 14 are opened, part of hot re-steam in the boiler 1 enters the molten salt heater 15, the molten salt in the low-temperature molten salt tank 19 enters the molten salt heater 15 after being boosted by the low-temperature molten salt pump 20, the temperature is increased by heat exchange to become high-temperature molten salt, and then the high-temperature molten salt enters the high-temperature molten salt tank 16 for storage; steam at the outlet of the molten salt heater 15 enters a heating unit part of condensed water in the steam-water heat exchanger 11, and exhaust steam is converged into a unit condenser 6;
when the fused salt heat storage system supplies steam to the outside, the fourth valve 23 is opened, the fused salt in the high-temperature fused salt tank 16 is pressurized by the high-temperature fused salt pump 17 and then enters the steam generator 18, the demineralized water is heated to become high-temperature steam to be supplied to the outside, and the released fused salt enters the low-temperature fused salt tank 19 to be stored;
when the fused salt heat storage system supplies power to the outside, the fifth valve 24 is opened, steam at the outlet of the steam generator 18 enters the steam turbine 21 to expand and do work, and the second generator 22 is dragged to generate power; when the first switch 27 is closed, the second switch 28 is opened, and the outlet of the second generator 22 is connected to the main transformer 25, so that the generated power is supplied to the outside.
When the power plant unit is completely stopped and needs to be started, the first switch 27 is switched off, the second switch 28 is switched on, the outlet of the second generator 22 is merged into the service power end through the service transformer 26, and the auxiliary machine in the starting process is driven to operate, so that the power supply of the power plant in the black start process is realized.
Claims (7)
1. The fused salt heat storage steam supply system for supplying the black start power supply is characterized by comprising a boiler (1), a steam outlet of the boiler (1) is connected with a high-pressure cylinder (2), a reheated steam outlet of the boiler (1) is connected with a middle-pressure cylinder (3) through a pipeline, a steam outlet of the middle-pressure cylinder (3) is connected with a low-pressure cylinder (4) through a pipeline, the low-pressure cylinder (4) is connected with a first generator (5), the first generator (5) is connected with a second generator (22), a main transformer (25) and a service transformer (26), the reheated steam of the boiler (1) is used as a heat source and is connected with a fused salt heater (15) through a pipeline, the reheated steam after heat exchange in the fused salt heater (15) is connected with a steam-water heat exchanger (11) through a pipeline, the fused salt in the fused salt heater (15) is connected with a high-temperature fused salt tank (16) through a pipeline, and the high-temperature fused salt tank (16) is connected with a steam generator (18), the fused salt export of steam generator (18) passes through pipe connection low temperature fused salt jar (19), and fused salt heater (15) are connected in low temperature fused salt jar (19), and the demineralized water source is connected in steam generator (18), and the steam outlet of steam generator (18) passes through pipe connection steam turbine (21) and industry and supplies the export of vapour, and second generator (22) are connected in steam turbine (21).
2. The molten salt heat storage and steam supply system for supplying the black start power supply according to claim 1, wherein a steam exhaust outlet of the low-pressure cylinder (4) is connected with a condenser (6) through a pipeline, the condenser (6) is connected with a low-pressure heater group (8) and a steam-water heat exchanger (11), the low-pressure heater group (8) and the steam-water heat exchanger (11) are both connected with a high-pressure heater group (10), the high-pressure heater group (10) is connected with a boiler (1), and steam after heat exchange in the steam-water heat exchanger (11) is connected with an inlet of the condenser (6) through a pipeline.
3. The molten salt heat storage and steam supply system for supplying the black-start power supply according to claim 2, wherein a condensate pump (7) is arranged at the downstream of the condenser (6), a first valve (12) is arranged between the condensate pump (7) and the low-pressure heater group (8), a second valve (13) is arranged between the condensate pump (7) and the steam-water heat exchanger (11), and a water supply pump (9) is arranged at the upstream of the high-pressure heater group (10).
4. A molten salt heat storage and steam supply system for supplying a black start power supply as claimed in claim 1, wherein a high temperature molten salt pump (17) is provided between the high temperature molten salt tank (16) and the steam generator (18), and a low temperature molten salt pump (20) is provided between the low temperature molten salt tank (19) and the molten salt heater (15).
5. A molten salt heat storage steam supply system for supplying black start power according to claim 1, characterized in that a first switch (27) is provided between the second generator (22) and the main transformer (25), and a second switch (28) is provided between the second generator (22) and the service transformer (26).
6. A molten salt heat storage and steam supply system for supplying black start power according to claim 1, characterized in that a third valve (14) is provided between the boiler (1) and the molten salt heater (15).
7. A molten salt heat storage steam supply system for supplying black start power according to claim 1, characterized in that a fourth valve (23) is provided between the steam generator (18) and the industrial steam supply outlet, and a fifth valve (24) is provided between the steam generator (18) and the steam turbine (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122813505.8U CN216278054U (en) | 2021-11-16 | 2021-11-16 | Molten salt heat storage and steam supply system for supplying black start power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122813505.8U CN216278054U (en) | 2021-11-16 | 2021-11-16 | Molten salt heat storage and steam supply system for supplying black start power supply |
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| Publication Number | Publication Date |
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| CN216278054U true CN216278054U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122813505.8U Active CN216278054U (en) | 2021-11-16 | 2021-11-16 | Molten salt heat storage and steam supply system for supplying black start power supply |
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2021
- 2021-11-16 CN CN202122813505.8U patent/CN216278054U/en active Active
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