CN216518187U - Auxiliary thermal power black starting system of molten salt heat storage back press machine - Google Patents
Auxiliary thermal power black starting system of molten salt heat storage back press machine Download PDFInfo
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- CN216518187U CN216518187U CN202122589823.0U CN202122589823U CN216518187U CN 216518187 U CN216518187 U CN 216518187U CN 202122589823 U CN202122589823 U CN 202122589823U CN 216518187 U CN216518187 U CN 216518187U
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Abstract
The utility model relates to an auxiliary thermal black start system of a molten salt heat storage back press, which comprises: the system comprises a power supply unit for a thermal power plant, a backpressure power generation unit and a load unit for a black start plant; 6.3kV factory bus in the power supply unit 1 for the thermal power plant to back pressure power generation unit fused salt heating device, all kinds of loads in the load unit for the black start factory supply power, back pressure power generation unit back pressure power generation system is connected to 6.3kV factory bus in the power supply unit for the thermal power plant. In the event of an accident, the backpressure power generation unit supplies power to a 6.3kV station bus in the thermal power station load unit, and at the moment, the first type load, the second type load and the third type load in the black start station load unit need to recover power supply in sequence according to the load sequence in which the thermal power starter must operate.
Description
Technical Field
The utility model relates to an auxiliary thermal power black starting system of a molten salt heat storage back press machine, in particular to a structure of the auxiliary thermal power black starting system of the molten salt heat storage back press machine.
Background
In recent years, with the development of the energy storage industry, various novel energy storage technologies are broken through continuously, and demonstration applications are realized in more and more scenes, wherein the novel energy storage technologies mainly include a heat storage technology, a hydrogen energy storage technology, an electromagnetic energy storage technology, a flywheel energy storage technology and the like. The heat storage technology belongs to an energy type energy storage technology, has high energy density, low cost, long service life, various utilization modes and high comprehensive heat utilization efficiency, and can play a great role in the application fields of renewable energy consumption, clean heating and solar photo-thermal power station energy storage systems. In recent years, the heat storage technologies that have attracted much attention mainly include molten salt heat storage technologies and high-temperature phase change heat storage technologies. The molten salt heat storage technology has the main advantages of large scale, convenient use by matching with a conventional gas engine and is mainly applied to a large-scale tower type photo-thermal power generation system and a groove type photo-thermal power generation system.
Black-start means that when a power system is in a full "Black" state due to a failure that all power supplies in the system quit operation, a unit with self-starting capability in the system is started first to realize power supply in a small range, and then other units without self-starting capability are driven to start and recover power supply gradually, and the recovery of the whole system is finally realized along with the gradual expansion of the recovery power supply range in the system.
SUMMERY OF THE UTILITY MODEL
The utility model provides an auxiliary thermal black start system of a molten salt heat storage back press, which is constructed, when a whole grid loses electricity and the thermal power is shut down, a heat source is provided for the back press through the molten salt heat storage system, a back pressure generator generates electricity and transmits the electricity to an electricity utilization system of a thermal power plant, and the start is similar to that: various auxiliary machines such as various oil pumps, air blowers, induced draft fans, circulating water pumps, feed pumps, cooling water pumps and the like are adopted, and finally black start of the thermal power generating unit is realized.
When the thermal power generating unit normally operates, the back pressure gas turbine drives the gas source to come from the thermal power turbine, high-temperature and high-pressure steam in the thermal power turbine pushes the back pressure gas turbine to rotate so as to drive the back pressure generator to rotate, and the generated electricity is merged into a plant section of the thermal power generating unit. 6.3kV station service power and 6.3kV/400V step-down diversion fused salt heating device power supply, store in low temperature tank 300 ℃ liquid fused salt and become 600 ℃ high temperature liquid fused salt through fused salt heating device and store in the high temperature tank, 600 ℃ high temperature liquid fused salt gets into salt-water heat exchanger through hot drive arrangement, will heat to 260 ℃ vapor that accords with rear end gas equipment demand through booster pump pressurization to the oxygen-removed water of 1.2 MPa.
When the whole network loses power, the thermal power generating unit stops, the generator is disconnected at the moment, the power supply for the alternating current plant of the unit completely disappears, the air supply valve of the rear-end air using equipment is closed at the moment, the high-temperature waste heat of liquid molten salt in a liquid molten salt high-temperature tank is utilized to heat deaerated water, the air inlet valve of the back pressure turbine is opened, high-pressure steam at 260 ℃ pushes the back pressure turbine to rotate to drive the back pressure generator to rotate, the back pressure generator supplies power to 6.3kV plant equipment, power supply is restored according to the load sequence that the thermal power generating unit must run, namely, the first-class load, the second-class load and the third-class load, and the power supply is necessary for example: the method comprises the steps of fuel supply, a cooling system, a direct current system, emergency lighting and excitation system load, and finally, the backrest press generates electricity to finally realize black start of the thermal power generating unit.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
supplementary fire power black start-up system of fuse salt heat storage back press includes: the system comprises a power supply unit for a thermal power plant, a backpressure power generation unit and a load unit for a black start plant;
6.3kV factory bus in the power supply unit 1 for the thermal power plant to back pressure power generation unit fused salt heating device, all kinds of loads in the load unit for the black start factory supply power, back pressure power generation unit back pressure power generation system is connected to 6.3kV factory bus in the power supply unit for the thermal power plant.
In a further improvement of the present invention, the power supply unit for thermal power plant comprises: the system comprises a gas turbine, a gas turbine exhaust valve, a generator, a 20 kV-to-6.3 kV high station-to-6.3 kV station bus connection switch and a 6.3kV station bus;
the turbine passes through the steam pipe and connects the generator, and the steam turbine drives generator rotor and produces the alternating current through excitation system, steam turbine discharge valve is connected to back pressure turbine, generator exit linkage has the high-voltage side becomes in the high factory, 6.3kV factory is with the generating line through 6.3kV factory is with generating line contact switch and is connected to the high-voltage side becomes in the high factory.
A further improvement of the present invention is that the back pressure power generation unit includes: the system comprises a fused salt heating device grid-connected switch, a fused salt heating device pressure reduction transformer, a fused salt heating device, a liquid fused salt low-temperature tank, a low-temperature liquid fused salt water inlet valve, a high-temperature liquid fused salt water outlet valve, a liquid fused salt high-temperature tank, a high-temperature liquid fused salt heat driving device, industrial deaerated water, a deaerated water inlet valve, a deaerated water booster pump, a salt-water heat exchanger, a backpressure gas turbine air inlet valve, a backpressure gas turbine, a backpressure generator pressure increase transformer and a backpressure generator grid-connected switch;
the voltage-reducing and voltage-changing high-voltage side of the molten salt heating device is connected to the 6.3kV factory bus through the grid-connected switch of the molten salt heating device, and the molten salt heating device is connected to the voltage-reducing and voltage-changing low-voltage side of the molten salt heating device;
the liquid molten salt low-temperature tank is connected with the molten salt heating device through the low-temperature liquid molten salt inlet valve, the low-temperature liquid molten salt is heated by the molten salt heating device to form high-temperature liquid molten salt, and the high-temperature liquid molten salt enters the liquid molten salt high-temperature tank through the high-temperature liquid molten salt outlet valve, the liquid molten salt high-temperature tank is connected with the high-temperature liquid molten salt thermal driving device, liquid high-temperature molten salt is pressurized by the liquid molten salt thermal driving device and then is transmitted to the salt-water heat exchanger, the industrial deoxygenated water enters the salt-water heat exchanger through the deoxygenated water inlet valve and the deoxygenated water booster pump to form high-pressure deoxygenated water, the industrial high-pressure deoxygenated water is heated to a temperature higher than 260 ℃ through liquid high-temperature molten salt to form high-pressure water vapor, and the high-pressure water vapor is normally transmitted to an off-plant gas utilization device;
the backpressure generator is connected with the backpressure generator through a backpressure excitation system, and the backpressure generator is driven by the backpressure turbine to generate alternating current; the outlet of the backpressure generator is connected to the boost-variable low-voltage side of the backpressure machine, and the boost-variable high-voltage side of the backpressure machine is connected to the 6.3kV station bus through the grid-connected switch of the backpressure machine.
The further improvement of the utility model is that the fused salt heating device adopts a heating resistance wire and an automatic zero-crossing point judging switch, and the power control of the fused salt heating device is realized by the automatic zero-crossing point judging switch.
The utility model has the further improvement that the molten salt heating device belongs to a high-power electric device, and when a thermal driving device operates, the deep peak regulation capacity of the thermal power generating unit can be further excavated.
In a further development of the utility model, the back pressure gas turbine air supply is from the steam turbine and the salt-water heat exchanger, the steam turbine exhaust valve is closed in normal conditions, the back pressure gas turbine air supply is from the steam turbine, the back pressure gas turbine air inlet valve is closed in case of an accident when the whole grid is de-energized, and the back pressure gas turbine air supply is from the salt-water heat exchanger.
The utility model is further improved in that in case of accident, the gas turbine can not supply gas to the back pressure gas turbine normally, at this time, the exhaust valve of the gas turbine is closed, the back pressure power generation unit closes the valve of the high temperature steam output, and opens the valve of the intake valve of the back pressure gas turbine; the liquid molten salt high-temperature tank is good in heat insulation performance and capable of maintaining the high-temperature state of the liquid molten salt for more than 2 hours, the industrial deoxygenated water is heated by utilizing the high-temperature waste heat of the liquid molten salt in the liquid molten salt high-temperature tank, the back pressure turbine is pushed by high-pressure steam at 260 ℃ to rotate to drive the back pressure generator to rotate, and alternating current is generated and incorporated into the 6.3kV factory bus.
In a further improvement of the present invention, the black-start service load unit comprises: the system comprises a first-class load grid-connected switch, a first-class load, a second-class load grid-connected switch, a second-class load, a third-class load grid-connected switch, a third-class load low-station-variation load and a third-class load;
one kind of load passes through one kind load switch access that is incorporated into the power networks 6.3kV factory bus, two kinds of loads pass through two kinds of load switch access that is incorporated into the power networks 6.3kV factory bus, the low factory of three kinds of loads becomes the high-pressure side and passes through three kinds of load switch that is incorporated into the power networks is connected to 6.3kV factory bus, the low factory of three kinds of loads becomes the low pressure side and is connected with three kinds of loads.
The further improvement of the utility model is that when the back pressure generator supplies power to the 6.3kV station bus, because the capacity of the back pressure generator is not large, the voltage of the 6.3kV station bus is unstable, and the load starts impact current, the voltage of the bus is reduced in a transient state, so that the first type load, the second type load and the third type load can not be started automatically, and at the moment, the first type load, the second type load and the third type load need to be restored to supply power according to the load sequence which needs to be operated by a thermal power starter, and the starting comprises the following steps: the first type of load of a primary fan, a secondary fan, an induced draft fan, a blower, an electric water feeding pump, a condensate pump, a circulating water pump, a coal feeder, a powder feeder, an air preheater, a booster fan and an air cooling island cooling fan is restarted, wherein the restarting comprises the second type of load which allows short-time power failure, but the power failure time is too long, so that equipment can be damaged or normal production can be influenced; the first-class load and the second-class load are started to realize black start of the thermal power generating unit, and after the thermal power generating unit is started, the third-class load is started to finally realize heat supply by molten salt and power generation by a back pressure machine and finally realize black start of the thermal power generating unit.
Compared with the prior art, the utility model has at least the following beneficial technical effects:
1. the heat melting driving device in the backpressure power generation unit adopts a heating resistance wire and an automatic zero crossing point judging switch to control the temperature of a high-temperature tank in the molten salt heating unit. The related equipment has lower cost and is more suitable for the auxiliary thermal black start system of the molten salt heat storage back press.
2. The backpressure power generation unit can operate in a normal mode and an accident mode, and the backpressure power generation unit is mainly used for supplying high-temperature steam to external gas equipment and increasing the income of a thermal power plant. Under the accident mode, the auxiliary power supply of the thermal power generating unit can be continuously supplied, and the self-starting of the important auxiliary machine is realized.
3 under the accident condition, the backpressure power generation unit supplies power to a 6.3kV station bus in the thermal power station unit, and at the moment, the first type load, the second type load and the third type load in the black start station load unit need to recover power supply in sequence according to the load sequence in which the thermal power starter must operate.
Drawings
FIG. 1 is a diagram of an auxiliary thermal black start system of a molten salt heat storage back press machine.
Description of reference numerals:
1-a power supply unit for a thermal power plant; 2-a backpressure generating unit; and 3, starting the service load unit in black. 1-a gas turbine; 1-2-steam turbine exhaust valve; 1-3-generator; 1-4-20 kV to 6.3kV high-voltage substation; 1-5-6.3 kV factory bus tie switch; 1-6-6.3 kV factory bus. 2-1-fused salt heating device grid-connected switch; 2-reducing pressure of a molten salt heating device; 2-3-molten salt heating device; 2-4-liquid molten salt low-temperature tank; 2-5-a low-temperature liquid molten salt water inlet valve; 2-6-high temperature liquid molten salt outlet valve; 2-7-liquid molten salt high-temperature tank; 2-8-high temperature liquid molten salt heat driving device; 2-9-industrial deoxygenated water; 2-10-a deaerated water inlet valve; 2-11-deaerated water booster pump; 2-12-salt-water heat exchanger; 2-13-inlet valve of back pressure gas turbine; 2-14-back pressure turbine; 2-15-backpressure generator; 2-16-the pressure rising of the back pressure machine; 2-17-back pressure machine grid-connected switch. 3-1-class load grid-connected switch; 3-2-type load; 3-class II load grid-connected switch; 3-4-class II loads; 3-5-three types of load grid-connected switches; 3-6-three types of low-load factory changes; 3-7-type load.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the molten salt heat storage back press auxiliary thermal black start system provided by the utility model comprises: the system comprises a power supply unit 1 for the thermal power plant, a backpressure power generation unit 2 and a black-start plant load unit 3; 6.3kV factory bus to in the power supply unit 1 for the thermal power plant the fused salt heating device of back pressure power generation unit 2 all kinds of loads power supply in the load unit 3 for the black start factory, 2 back pressure power generation systems of back pressure power generation unit are connected to 6.3kV factory bus in the power supply unit 1 for the thermal power plant.
The unit 1 for a thermal power plant includes: the system comprises a gas turbine 1-1, a gas turbine exhaust valve 1-2, a generator 1-3, a 20 kV-to-6.3 kV-to-1-4 high-plant, a 6.3 kV-to-1-5 industrial bus tie switch and a 6.3 kV-to-1-6 industrial bus.
The back pressure power generation unit 2 includes: the system comprises 2-1 parts of a fused salt heating device grid-connected switch, 2-2 parts of a fused salt heating device pressure reduction transformer, 2-3 parts of a fused salt heating device, 2-4 parts of a liquid fused salt low-temperature tank, 2-5 parts of a low-temperature liquid fused salt water inlet valve, 2-6 parts of a high-temperature liquid fused salt water outlet valve, 2-7 parts of a liquid fused salt high-temperature tank, 2-8 parts of a high-temperature liquid fused salt heat driving device, 2-9 parts of industrial deaerated water, 2-10 parts of a deaerated water inlet valve, 2-11 parts of a deaerated water booster pump, 2-12 parts of a salt-water heat exchanger, 2-13 parts of a back pressure gas turbine air inlet valve, 2-14 parts of a back pressure gas turbine, 2-15 parts of a back pressure generator, 2-16 parts of a back pressure turbine pressure boost transformer and 2-17 parts of a back pressure grid-connected switch.
The black start service load unit 3 includes: the system comprises a first-class load grid-connected switch 3-1, a first-class load 3-2, a second-class load grid-connected switch 3-3, a second-class load 3-4, a third-class load grid-connected switch 3-5, a third-class load low-load transformer 3-6 and a third-class load 3-7.
The turbine 1-1 is connected with the generator 1-3 through a steam pipeline, and the turbine drives a generator rotor to generate alternating current through an excitation system. The steam turbine exhaust valve 1-2 is connected to the back pressure steam turbine 2-14, the outlet of the generator 1-3 is connected with the high voltage side of the high voltage plant transformer 1-4, and the 6.3kV plant bus 1-6 is connected to the low voltage side of the high voltage plant transformer 1-4 through the 6.3kV plant bus tie switch 1-5.
The high-voltage side of the reduced voltage transformer 2-2 of the molten salt heating device is connected to the 6.3kV factory bus 1-6 through the grid-connected switch of the molten salt heating device, and the low-voltage side of the reduced voltage transformer 2-2 of the molten salt heating device 2-3 is connected.
The molten salt heating device 2-3 adopts a heating resistance wire and an automatic zero crossing point judging switch, and the power control of the molten salt heating device 2-3 is realized through the automatic zero crossing point judging switch. The molten salt heating device 2-3 belongs to a high-power electric device, and when the thermal driving device operates, the deep peak regulation capacity of the thermal power generating unit can be further excavated.
The liquid molten salt low-temperature tank 2-4 is connected with the molten salt heating device 2-3 through the low-temperature liquid molten salt inlet valve 2-5, low-temperature liquid molten salt is heated by the molten salt heating device 2-3 to become high-temperature liquid molten salt, the high-temperature liquid molten salt enters the liquid molten salt high-temperature tank 2-7 through the high-temperature liquid molten salt outlet valve 2-6, the liquid molten salt high-temperature tank 2-7 is connected with the high-temperature liquid molten salt heat driving device 2-8, and the liquid high-temperature molten salt is pressurized by the liquid molten salt heat driving device 2-8 and then is transmitted to the salt-water heat exchanger 2-12. The industrial deoxygenated water 2-9 enters the salt-water heat exchanger 2-12 through the deoxygenated water inlet valve 2-10 and the deoxygenated water booster pump 2-11 to form high-pressure deoxygenated water, the industrial high-pressure deoxygenated water is heated to a temperature of over 260 ℃ through liquid high-temperature molten salt to form high-pressure steam, and the high-pressure steam is normally transmitted to an off-plant gas utilization device.
The air source of the back pressure gas turbine 2-14 is from the steam turbine 1-1 and the salt-water heat exchanger 2-1, the exhaust valve 1-2 of the steam turbine is closed under normal conditions, the air source of the back pressure gas turbine 2-14 is from the steam turbine 1-1, the air inlet valve 2-13 of the back pressure gas turbine is closed when the whole network is powered off under accident conditions, and the air source of the back pressure gas turbine 2-14 is from the salt-water heat exchanger 2-1. The back pressure turbine 2-14 is connected to the back pressure generator 2-15, and the back pressure turbine 2-14 drives the back pressure generator 2-15 to rotate and generate alternating current through a back pressure excitation system. The outlet of the back pressure generator 2-15 is connected to the low-voltage side of the back pressure machine boosting transformer 2-16, and the high-voltage side of the back pressure machine boosting transformer 2-16 is connected to the 6.3kV factory bus 1-6 through the back pressure machine grid-connected switch 2-17.
In case of accident, the gas turbine 1-1 can not normally supply gas to the back pressure gas turbine 2-14, at this time, the exhaust valve 1-2 of the gas turbine is closed, the back pressure power generation unit closes the valve of the high temperature steam output, and opens the valve of the air inlet valve 2-14 of the back pressure gas turbine. The liquid molten salt high-temperature tank 2-7 is good in heat preservation performance and capable of maintaining the high-temperature state of the liquid molten salt for more than 2 hours, the industrial deoxygenated water 2-9 is heated by utilizing the high-temperature waste heat of the liquid molten salt in the liquid molten salt high-temperature tank 2-7, high-pressure steam at 260 ℃ pushes the back pressure gas turbine 2-14 to rotate to drive the back pressure generator 2-15 to rotate, and alternating current is generated and is merged into the 6.3kV plant bus 1-6.
The first-class load 3-2 is connected to the 6.3kV service bus 1-6 through the first-class load grid-connected switch 3-1, the second-class load 3-4 is connected to the 6.3kV service bus 1-6 through the second-class load grid-connected switch 3-3, the high-voltage side of the third-class load low-voltage substation is connected to the 6.3kV service bus 1-6 through the third-class load grid-connected switch 3-5, and the low-voltage side of the third-class load low-voltage substation 3-6 is connected with the third-class load 3-7. When the back pressure generator 2-15 supplies power to the 6.3kV station bus 1-6, because the capacity of the back pressure generator 2-15 is not large, the voltage of the 6.3kV station bus is unstable, and the load starts impact current, the voltage transient state of the bus is reduced, so that the first-class load 3-2, the second-class load 3-4 and the third-class load 3-7 can not be automatically started, at this time, the first-class load 3-2, the second-class load 3-4 and the third-class load 3-7 need to be restored to supply power according to the load sequence in which the thermal power starting machine must operate, and the starting includes the following steps: the restarting of the first-class loads 3-2 of a primary fan, a secondary fan, an induced draft fan, a blower, an electric water feeding pump, a condensate pump, a circulating water pump, a coal feeder, a powder feeder, an air preheater, a booster fan, an air cooling island cooling fan and the like comprises the second-class loads 3-3 which allow short-time power failure, but have overlong power failure time and possibly damage equipment or influence normal production. The first-class load 3-2 and the second-class load 3-3 are started to realize black start of the thermal power generating unit, and after the thermal power generating unit is started, the third-class load 3-7 is started to finally realize heat supply by molten salt and power generation by a back pressure machine and finally realize black start of the thermal power generating unit.
Claims (9)
1. Supplementary thermoelectricity black start-up system of fused salt heat storage back press machine, its characterized in that includes: the system comprises a power supply unit for a thermal power plant, a backpressure power generation unit and a load unit for a black start plant;
6.3kV factory bus in the power supply unit for the thermal power plant to back pressure power generation unit fused salt heating device, all kinds of loads in the load unit for the black start factory supply power, back pressure power generation unit is connected to 6.3kV factory bus in the power supply unit for the thermal power plant.
2. The molten salt heat storage back pressure machine assisted thermal black start system according to claim 1, wherein the power supply unit for thermal power plant comprises: the system comprises a gas turbine, a gas turbine exhaust valve, a generator, a 20 kV-to-6.3 kV high station-to-6.3 kV station bus connection switch and a 6.3kV station bus;
the gas turbine passes through the steam pipe and connects the generator, and the steam turbine drives generator rotor and produces the alternating current through excitation system, steam turbine discharge valve is connected to the backpressure gas turbine of backpressure power generation unit, the generator exit linkage has the high factory becomes the high voltage side, 6.3kV factory is with the generating line through 6.3kV factory is with generating line contact switch and is connected to the high factory becomes the low voltage side.
3. The molten salt heat storage back pressure machine assisted thermal black start system according to claim 2, wherein the back pressure power generation unit comprises: the system comprises a fused salt heating device grid-connected switch, a fused salt heating device pressure reduction transformer, a fused salt heating device, a liquid fused salt low-temperature tank, a low-temperature liquid fused salt water inlet valve, a high-temperature liquid fused salt water outlet valve, a liquid fused salt high-temperature tank, a high-temperature liquid fused salt heat driving device, industrial deaerated water, a deaerated water inlet valve, a deaerated water booster pump, a salt-water heat exchanger, a backpressure gas turbine air inlet valve, a backpressure gas turbine, a backpressure generator pressure increase transformer and a backpressure generator grid-connected switch;
the voltage-reducing and voltage-changing high-voltage side of the molten salt heating device is connected to the 6.3kV factory bus through the grid-connected switch of the molten salt heating device, and the molten salt heating device is connected to the voltage-reducing and voltage-changing low-voltage side of the molten salt heating device;
the liquid molten salt low-temperature tank is connected with the molten salt heating device through the low-temperature liquid molten salt inlet valve, the low-temperature liquid molten salt is heated by the molten salt heating device to form high-temperature liquid molten salt, and the high-temperature liquid molten salt enters the liquid molten salt high-temperature tank through the high-temperature liquid molten salt outlet valve, the liquid molten salt high-temperature tank is connected with the high-temperature liquid molten salt thermal driving device, liquid high-temperature molten salt is pressurized by the liquid molten salt thermal driving device and then is transmitted to the salt-water heat exchanger, the industrial deoxygenated water enters the salt-water heat exchanger through the deoxygenated water inlet valve and the deoxygenated water booster pump to form high-pressure deoxygenated water, the industrial high-pressure deoxygenated water is heated to a temperature higher than 260 ℃ through liquid high-temperature molten salt to form high-pressure water vapor, and the high-pressure water vapor is normally transmitted to an off-plant gas utilization device;
the backpressure generator is connected with the backpressure generator through a backpressure excitation system, and the backpressure generator is driven by the backpressure turbine to generate alternating current; the outlet of the backpressure generator is connected to the boost-variable low-voltage side of the backpressure machine, and the boost-variable high-voltage side of the backpressure machine is connected to the 6.3kV station bus through the grid-connected switch of the backpressure machine.
4. The auxiliary thermal power black starting system of the molten salt heat storage back press machine as claimed in claim 3, wherein the molten salt heating device adopts a heating resistance wire and an automatic zero-crossing point judging switch, and power control of the molten salt heating device is realized through the automatic zero-crossing point judging switch.
5. The auxiliary thermal power black starting system of the molten salt heat storage back press machine according to claim 3, wherein the molten salt heating device belongs to a high-power electric device, and when a thermal driving device operates, the deep peak regulation capability of a thermal power unit can be further developed.
6. The system of claim 3, wherein the back pressure gas turbine air supply is from the steam turbine and the salt-water heat exchanger, the steam turbine exhaust valve is closed under normal conditions, the back pressure gas turbine air supply is from the steam turbine, the full grid is de-energized under accident conditions, the back pressure gas turbine intake valve is closed, and the back pressure gas turbine air supply is from the salt-water heat exchanger.
7. The system of claim 3, wherein in case of an accident, the turbine cannot supply gas to the back pressure turbine normally, the exhaust valve of the turbine is closed, the back pressure power generation unit closes the high temperature steam output valve, and opens the intake valve of the back pressure turbine; the liquid molten salt high-temperature tank is good in heat insulation performance and capable of maintaining the high-temperature state of the liquid molten salt for more than 2 hours, the industrial deoxygenated water is heated by utilizing the high-temperature waste heat of the liquid molten salt in the liquid molten salt high-temperature tank, the back pressure turbine is pushed by high-pressure steam at 260 ℃ to rotate to drive the back pressure generator to rotate, and alternating current is generated and incorporated into the 6.3kV factory bus.
8. The molten salt heat storage back press auxiliary thermal power black start system of claim 3, wherein the black start service load unit comprises: the system comprises a first-class load grid-connected switch, a first-class load, a second-class load grid-connected switch, a second-class load, a third-class load grid-connected switch, a third-class load low-station-variation load and a third-class load;
one kind of load passes through one kind load switch access that is incorporated into the power networks 6.3kV factory bus, two kinds of loads pass through two kinds of load switch access that is incorporated into the power networks 6.3kV factory bus, the low factory of three kinds of loads becomes the high-pressure side and passes through three kinds of load switch that is incorporated into the power networks is connected to 6.3kV factory bus, the low factory of three kinds of loads becomes the low pressure side and is connected with three kinds of loads.
9. The fused salt heat storage back pressure machine auxiliary thermal black start system according to claim 8, wherein when the back pressure generator supplies power to the 6.3kV station bus, because the back pressure generator has a small capacity, the 6.3kV station bus has unstable voltage, and load starting impulse current causes a transient reduction in bus voltage, which easily causes the first type load, the second type load, and the third type load to fail to start automatically, and at this time, the first type load, the second type load, and the third type load need to be restored to power supply in sequence according to a load sequence in which a thermal power start machine must operate, and the starting first includes: the first type of load of a primary fan, a secondary fan, an induced draft fan, a blower, an electric water feeding pump, a condensate pump, a circulating water pump, a coal feeder, a powder feeder, an air preheater, a booster fan and an air cooling island cooling fan is restarted, wherein the restarting comprises the second type of load which allows short-time power failure, but the power failure time is too long, so that equipment can be damaged or normal production can be influenced; the first-class load and the second-class load are started to realize black start of the thermal power generating unit, and after the thermal power generating unit is started, the third-class load is started to finally realize heat supply by molten salt and power generation by a back pressure machine and finally realize black start of the thermal power generating unit.
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| CN202122589823.0U CN216518187U (en) | 2021-10-26 | 2021-10-26 | Auxiliary thermal power black starting system of molten salt heat storage back press machine |
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| CN202122589823.0U CN216518187U (en) | 2021-10-26 | 2021-10-26 | Auxiliary thermal power black starting system of molten salt heat storage back press machine |
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