CN113864016A - Diesel generator standby system based on molten salt heat storage of power plant - Google Patents
Diesel generator standby system based on molten salt heat storage of power plant Download PDFInfo
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- CN113864016A CN113864016A CN202111249309.0A CN202111249309A CN113864016A CN 113864016 A CN113864016 A CN 113864016A CN 202111249309 A CN202111249309 A CN 202111249309A CN 113864016 A CN113864016 A CN 113864016A
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- switch
- generator
- molten salt
- transformer
- heat storage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/34—Turning or inching gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
Abstract
The invention discloses a standby system of a diesel generator based on fused salt heat storage of a power plant, which comprises a 500kV high-voltage bus, a main transformer, a generator, a high-voltage station transformer, a 6kV station power bus, a boiler transformer, a boiler PC section, a security PC section, a diesel generator, a small steam turbine, a fused salt heat storage transformer, an electric heater, a high-temperature tank, a low-temperature tank and a heat exchanger. When the generator set fails and loses service power and the security section does not supply power, if the diesel generator fails in fault maintenance or start-up, emergency power supply can be performed for the security section through the molten salt heat storage system and the small turbonator, so that the critical load of a power plant can be ensured to normally operate, the generator set can be safely shut down, and the safety of the system is improved.
Description
Technical Field
The invention belongs to the field of fused salt heat storage of power plants, and particularly relates to a standby system of a diesel generator based on the fused salt heat storage of the power plants.
Background
The cogeneration unit has inherent advantages in the aspect of gradient utilization of energy, can greatly improve the thermal efficiency of the coal-fired thermal power generating unit and reduce the total pollutant emission, is one of heat source forms with stable, reliable and efficient heating in winter, and is one of ideal heat sources for replacing small coal-fired industrial boilers around power plants. However, the cogeneration unit itself also exhibits strong thermoelectric coupling characteristics, and further down regulation of the electrical load cannot be realized due to the demand for heat supply guarantee in the low-ebb period of the electrical load of the power grid. During the high load period of the power grid, the power grid cannot be operated with full load (electric load) due to the requirement of heat supply, so that more and more thermal power generating units adopt a molten salt heat storage mode to relieve the contradiction between the heat supply and the power generation of the units.
The working load of a thermal power plant engine furnace is connected to a 6kV station power bus, one end of a boiler transformer is connected with the 6kV station power bus, the other end of the boiler transformer is connected to a boiler PC section, the boiler PC section is connected with a security PC section, the security PC section is connected with a diesel generator, one end of a fused salt heat storage transformer is connected with the 6kV station power bus, and the other end of the fused salt heat storage transformer is connected with an electric heater; when the system normally operates, the fused salt heat storage system can help the unit to improve the peak regulation and frequency modulation capabilities and increase the heat supply safety of the unit. The load of the security section of the unit is supplied with power by a station service system, if the accident causes the power loss of the whole plant, the diesel generator is used as a standby power supply to supply power for the key load of the security section, the unit can be ensured to be normally shut down, and a system wiring diagram is shown in figure 1.
By adopting the system with the connection mode, when the unit breaks down emergently and loses station service power, if the diesel generator is overhauled or fails to start, the key equipment on the security section cannot start, so that the unit cannot be stopped normally and the equipment is damaged.
Disclosure of Invention
The invention aims to provide a backup system of a diesel generator, which has a simple structure and can effectively improve the safety of a unit, for a thermal power plant with a molten salt heat storage system.
The invention is realized by adopting the following technical scheme:
a standby system of a diesel generator based on molten salt heat storage of a power plant comprises a 500kV high-voltage bus, a main transformer, a generator, a high-voltage station transformer, a 6kV station bus, a boiler transformer, a boiler PC section, a security PC section, a diesel generator, a small steam turbine, a molten salt heat storage transformer, an electric heater, a high-temperature tank, a low-temperature tank and a heat exchanger; wherein the content of the first and second substances,
the outlet of the generator is connected with a main transformer and a high-voltage station transformer, the main transformer is connected with a 500kV high-voltage bus through a first switch, the high-voltage station transformer is connected with a 6kV station bus through a second switch, the 6kV station bus is connected with the high-voltage side of a boiler transformer through a third switch, the low-voltage side of the boiler transformer is connected to a boiler PC section, the boiler PC section is connected to a security PC section through a fifth switch, the security PC section is respectively connected with a diesel generator through a seventh switch and an eighth switch, the small-size generator links to each other, and the small-size generator is by the coaxial drive of small-size steam turbine, and 6kV station service power bus passes through the fourth switch and links to each other with fused salt heat-retaining transformer, and fused salt heat-retaining transformer passes through the sixth switch and links to each other with electric heater, and electric heater passes through fused salt pipeline and links to each other with high temperature tank, low temperature tank, and high temperature tank, low temperature tank pass through fused salt pipeline and link to each other with the heat exchanger.
The further improvement of the invention is that when the fused salt heat storage system works normally, the fused salt is heated by the low-temperature tank through the electric heater and enters the high-temperature tank, then the fused salt and the water vapor exchange heat through the heat exchanger from the high-temperature tank and then return to the low-temperature tank, and the water vapor is heated by the heat exchanger and reaches the industrial air supply standard.
The invention has the further improvement that when the system fails and the station service loses power, the electric heater cannot heat the molten salt, and the molten salt heat storage system can continue to work to ensure that the industrial steam supply is not interrupted until the molten salt storage capacity of the high-temperature tank is reduced to a critical value.
The invention is further improved in that the small generator is a permanent magnet machine excitation generator, and the small turbine can be driven by industrial heating steam so as to drive the small generator to generate electricity.
The invention has the further improvement that when the generator set normally operates, the generator respectively supplies power to a 500kV high-voltage bus and a 6kV service bus through a main transformer and a high-voltage service transformer, the 6kV service bus supplies power to a PC section of the boiler through a boiler transformer, the PC section of the boiler supplies power to a security PC section, a working power supply of the security PC section is automatically provided by the generator, and the 6kV service bus supplies power to the electric heater through a fused salt heat storage transformer to ensure the normal operation of a fused salt system. The first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are in the closed position; the seventh switch and the eighth switch are in the off position.
The invention has the further improvement that when the system has a fault and the power is lost in the whole plant, the power supply of the 6kV service bus is interrupted, the diesel generator and the small generator are started immediately and simultaneously, if the diesel generator and the small generator are started and operated normally, the security PC section is powered by the diesel generator emergently, the small generator is used as a standby power supply of the diesel generator, and once the diesel generator has a fault, the small generator is switched to the small generator quickly. The seventh switch is in the closed position; the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the eighth switch are in the position division.
The invention has the further improvement that when the system has a fault and the whole plant loses power, the power supply of the 6kV service bus is interrupted, if the diesel generator fails to be overhauled or started, the safety PC section is emergently supplied by the small generator, and the eighth switch is in the closed position; the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are in the position division.
The invention has the following beneficial technical effects:
the reliability of the emergency power supply of the security section of the existing system is limited by the diesel generator, once the diesel generator is overhauled or has a fault, the generator set loses the emergency power supply of the security section, and the operation reliability of the generator set is greatly reduced. The invention provides a diesel generator standby system based on molten salt heat storage of a power plant, which is characterized in that a set of small turbonator is newly connected into a security section, air is extracted from an industrial steam supply inlet in the molten salt heat storage system to drive a small turbine, the small turbonator can be used as a standby power supply of the diesel generator, when a generator unit fails and loses service power and a security section does not supply power, if the diesel generator fails in maintenance or starting, the emergency power supply can be provided for the security section through the molten salt heat storage system and the small turbonator, the key load of the power plant is ensured to normally operate, the unit can be safely shut down, and the safety of the system is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art system.
Fig. 2 is a schematic diagram of a modified system.
FIG. 3 is a schematic diagram of a system during normal operation of a genset.
Fig. 4 is a schematic diagram of a system when a diesel generator supplies power to a security segment in the case of loss of service power.
Fig. 5 is a schematic diagram of a system when a small generator supplies power to a security segment in case of loss of service power.
Description of reference numerals:
1-500kV high-voltage bus, 2-main transformer, 3-generator, 4-high-voltage station transformer, 5-6kV station bus, 6-boiler transformer, 7-boiler PC section, 8-security PC section, 9-diesel generator, 10-small generator, 11-small turbine, 12-fused salt heat storage transformer, 13-electric heater, 14-high temperature tank, 15-low temperature tank, 16-heat exchanger;
101-first switch, 201-second switch, 202-third switch, 203-fourth switch, 301-fifth switch, 302-sixth switch, 401-seventh switch, 402-eighth switch.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 2, the standby system of the diesel generator based on molten salt heat storage of the power plant provided by the invention comprises a 500kV high-voltage bus 1, a main transformer 2, a generator 3, a high-voltage station transformer 4, a 6kV station bus 5, a boiler transformer 6, a boiler PC section 7, a security PC section 8, a diesel generator 9, a small generator 10, a small turbine 11, a molten salt heat storage transformer 12, an electric heater 13, a high-temperature tank 14, a low-temperature tank 15 and a heat exchanger 16; wherein, the outlet of the generator 3 is connected with a main transformer 2 and a high-voltage station transformer 4, the main transformer 2 is connected with a 500kV high-voltage bus 1 through a first switch 101, the high-voltage station transformer 4 is connected with a 6kV station bus 5 through a second switch 201, the 6kV station bus 5 is connected with the high-voltage side of a boiler transformer 6 through a third switch 202, the low-voltage side of the boiler transformer 6 is connected with a boiler PC section 7, the boiler PC section 7 is connected with a security PC section 8 through a fifth switch 301, the security PC section 8 is respectively connected with a diesel generator 9 and a small generator 10 through a seventh switch 401 and an eighth switch 402, the small generator 10 is coaxially driven by a small turbine 11, the 6kV station bus 5 is connected with a fused salt heat storage transformer 12 through a fourth switch 203, the fused salt heat storage transformer 12 is connected with an electric heater 13 through a sixth switch 302, the electric heater 13 is connected with a high-temperature tank 14 through a fused salt pipeline, The low-temperature tank 15 is connected, and the high-temperature tank 14 and the low-temperature tank 15 are connected with the heat exchanger 16 through molten salt pipelines.
The working principle of the invention is as follows:
as shown in fig. 3, when the generator set is in normal operation, the generator 3 supplies power to the 500kV high-voltage bus 1 and the 6kV service bus 5 through the main transformer 2 and the high-voltage service transformer 4, the 6kV service bus 5 supplies power to the boiler PC section 7 through the boiler transformer 6, the boiler PC section 7 supplies power to the security PC section 8, the working power of the security PC section 8 is supplied by the generator 3, and the 6kV service bus 5 supplies power to the electric heater 13 through the fused salt heat storage transformer 12 to ensure normal operation of the fused salt system. The first switch 101, the second switch 201, the third switch 202, the fourth switch 203, the fifth switch 301 and the sixth switch 302 are in the closed position; the seventh switch 401 and the eighth switch 402 are in the divide position.
As shown in fig. 4, when the system has a fault and the whole plant loses power, the power supply of the 6kV station service bus 5 is interrupted, the diesel generator 9 and the small generator 10 are started simultaneously, if the diesel generator 9 and the small generator 10 are both started and operated normally, the security PC section 8 is supplied with power by the diesel generator 9 in an emergency, the small generator 10 is used as a standby power supply of the diesel generator 9, and once the diesel generator 9 has a fault, the system is switched to the small generator 10 rapidly. The seventh switch 401 is on; the first switch 101, the second switch 201, the third switch 202, the fourth switch 203, the fifth switch 301, the sixth switch 302, and the eighth switch 402 are in the tap position.
As shown in fig. 5, when the system fails and the whole plant loses power, the power supply of the 6kV station service bus 5 is interrupted, if the diesel generator 9 fails to be overhauled or started, the security PC section 8 is powered by the small generator 10 in an emergency, and the eighth switch 402 is in an on position; the first switch 101, the second switch 201, the third switch 202, the fourth switch 203, the fifth switch 301, the sixth switch 302, and the seventh switch 401 are in the tap position.
Claims (8)
1. A diesel generator standby system based on molten salt heat storage of a power plant is characterized by comprising a 500kV high-voltage bus (1), a main transformer (2), a generator (3), a high-voltage station transformer (4), a 6kV station bus (5), a boiler transformer (6), a boiler PC section (7), a security PC section (8), a diesel generator (9), a small generator (10), a small steam turbine (11), a molten salt heat storage transformer (12), an electric heater (13), a high-temperature tank (14), a low-temperature tank (15) and a heat exchanger (16); wherein the content of the first and second substances,
the outlet of the generator (3) is connected with a main transformer (2) and a high-voltage station transformer (4), the main transformer (2) is connected with a 500kV high-voltage bus (1) through a first switch (101), the high-voltage station transformer (4) is connected with a 6kV station bus (5) through a second switch (201), the 6kV station bus (5) is connected with the high-voltage side of a boiler transformer (6) through a third switch (202), the low-voltage side of the boiler transformer (6) is connected to a boiler PC section (7), the boiler PC section (7) is connected to a security PC section (8) through a fifth switch (301), the security PC section (8) is respectively connected with a diesel generator (9) and a small generator (10) through a seventh switch (401) and an eighth switch (402), the small generator (10) is coaxially driven by a small turbine (11), and the 6kV station bus (5) is connected with a heat storage transformer (12) through a fourth switch (203), the molten salt heat storage transformer (12) is connected with the electric heater (13) through a sixth switch (302), the electric heater (13) is connected with the high-temperature tank (14) and the low-temperature tank (15) through molten salt pipelines, and the high-temperature tank (14) and the low-temperature tank (15) are connected with the heat exchanger (16) through molten salt pipelines.
2. The backup system of the diesel generator based on the molten salt heat storage of the power plant according to claim 1, wherein when the molten salt heat storage system works normally, the molten salt enters the high temperature tank (14) from the low temperature tank (15) through the electric heater (13), and then returns to the low temperature tank (15) from the high temperature tank (14) after heat exchange with the water vapor through the heat exchanger (16), and the water vapor reaches the industrial air supply standard after being heated by the heat exchanger (16).
3. The backup system of the diesel generator based on molten salt heat storage of the power plant as claimed in claim 2, characterized in that when the system fails and the station power is lost, the electric heater (13) can not heat the molten salt, the molten salt heat storage system can continue to work, and the industrial steam supply is not interrupted until the molten salt storage of the high-temperature tank drops to the critical value.
4. The backup system of diesel generator based on molten salt heat storage of power plant according to claim 1, characterized in that the small generator (10) is a permanent magnet machine excitation generator.
5. The backup system for the molten salt heat storage-based diesel generator of the power plant according to claim 4, characterized in that the small turbine (11) is driven by industrial heating steam, thereby driving the small generator (10) to generate electricity.
6. The diesel generator standby system based on molten salt heat storage of the power plant according to claim 1, wherein when the generator set is in normal operation, the generator (3) supplies power to the 500kV high-voltage bus (1) and the 6kV service bus (5) through the main transformer (2) and the high-voltage service transformer (4), the 6kV service bus (5) supplies power to the boiler PC section (7) through the boiler transformer (6), the boiler PC section (7) supplies power to the security PC section (8), the working power of the security PC section (8) is supplied by the generator (3), and the 6kV service bus (5) supplies power to the electric heater (13) through the molten salt heat storage transformer (12) to ensure normal operation of the molten salt system; the first switch (101), the second switch (201), the third switch (202), the fourth switch (203), the fifth switch (301) and the sixth switch (302) are in the closed position; the seventh switch (401) and the eighth switch (402) are in the divide position.
7. The diesel generator standby system based on molten salt heat storage of the power plant is characterized in that when the system fails and the whole plant loses power, the power supply of the 6kV service bus (5) is interrupted, the diesel generator (9) and the small generator (10) are started simultaneously, if the diesel generator (9) and the small generator (10) are started and operated normally, the security PC section (8) is supplied with power by the diesel generator (9) in an emergency mode, the small generator (10) serves as a standby power supply of the diesel generator (9), and once the diesel generator (9) fails, the system is switched to the small generator (10) rapidly; the seventh switch (401) is in the closed position; the first switch (101), the second switch (201), the third switch (202), the fourth switch (203), the fifth switch (301), the sixth switch (302) and the eighth switch (402) are in a position division state.
8. The diesel generator backup system based on molten salt heat storage of the power plant is characterized in that when the system fails and loses power from the whole plant, the power supply of the 6kV service bus (5) is interrupted, if the diesel generator (9) fails in fault maintenance or starting, the safety PC section (8) is supplied with power by the small generator (10) in an emergency, and the eighth switch (402) is closed; the first switch (101), the second switch (201), the third switch (202), the fourth switch (203), the fifth switch (301), the sixth switch (302) and the seventh switch (401) are in the position division.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111249309.0A CN113864016A (en) | 2021-10-26 | 2021-10-26 | Diesel generator standby system based on molten salt heat storage of power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111249309.0A CN113864016A (en) | 2021-10-26 | 2021-10-26 | Diesel generator standby system based on molten salt heat storage of power plant |
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| CN113864016A true CN113864016A (en) | 2021-12-31 |
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| CN202111249309.0A Pending CN113864016A (en) | 2021-10-26 | 2021-10-26 | Diesel generator standby system based on molten salt heat storage of power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023168863A1 (en) * | 2022-03-11 | 2023-09-14 | 西安热工研究院有限公司 | System and method for implementing black start of thermal power generating unit by using molten salt heat storage |
| CN117293998A (en) * | 2023-09-25 | 2023-12-26 | 云南储能有限公司 | Station service electricity recovery control method and device based on generator set |
| CN117293998B (en) * | 2023-09-25 | 2024-04-19 | 云南储能有限公司 | Station service electricity recovery control method and device based on generator set |
-
2021
- 2021-10-26 CN CN202111249309.0A patent/CN113864016A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023168863A1 (en) * | 2022-03-11 | 2023-09-14 | 西安热工研究院有限公司 | System and method for implementing black start of thermal power generating unit by using molten salt heat storage |
| CN117293998A (en) * | 2023-09-25 | 2023-12-26 | 云南储能有限公司 | Station service electricity recovery control method and device based on generator set |
| CN117293998B (en) * | 2023-09-25 | 2024-04-19 | 云南储能有限公司 | Station service electricity recovery control method and device based on generator set |
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