CN216477491U - Hot-oil plant service fused salt heat storage and steam supply system - Google Patents

Abstract

The utility model discloses an electric molten salt heat storage and steam supply system for thermal power plant, which comprises: the industrial molten salt heat storage and power supply unit comprises an industrial molten salt heat storage and power supply unit, a molten salt heat exchange unit and an industrial gas generation unit; the utility model provides a fuse salt heat exchange unit, including industrial electricity fuse salt heat storage power supply unit, industrial electricity fuse salt heat exchange unit, industrial electricity fuse salt heat exchanger, industrial electricity fuse salt heat exchange unit, industrial electricity fuse salt heat exchanger, industrial electricity fuse salt heat exchange unit, and industrial electricity fuse salt. The heat energy of the industrial gas generation unit is from the molten salt heat exchange unit, so that the condition that the industrial hot water steam of the conventional thermal power heating system is from the intermediate pressure cylinder is avoided, the original thermal power heating system is not required to be modified, and the investment cost is saved.

Description

Hot-oil plant service fused salt heat storage and steam supply system

Technical Field

The utility model relates to an electric molten salt heat storage and steam supply system for thermal power plant, in particular to a structure of an electric molten salt heat storage and steam supply system for thermal power plant.

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.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric fused salt heat storage and steam supply system for a thermal power plant, which is constructed and used for supplying power to the thermal power plant, 6kV power plant and 6kV/400V voltage reduction diversion fused salt heating devices are used for supplying power, 300 ℃ liquid fused salt stored in a low-temperature tank is changed into 600 ℃ high-temperature liquid fused salt by the fused salt heating devices and stored in a high-temperature tank, the 600 ℃ high-temperature liquid fused salt enters a salt-water heat exchanger by a thermal driving device, deoxygenated water pressurized to 1.2MPa by a booster pump is heated to 260 ℃ steam meeting industrial steam supply requirements, the steam enters an industrial gas unit, the 600 ℃ high-temperature liquid fused salt releases heat and then returns to the low-temperature tank to participate in the next fused salt heat storage and steam supply cycle.

In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:

thermal power plant station power molten salt heat storage steam supply system includes: the industrial molten salt heat storage and power supply unit, the molten salt heat exchange unit and the industrial gas generation unit;

the industrial molten salt heat storage and power supply unit is connected to an outlet of a power generator through a high transformer, the industrial molten salt heat storage and power supply unit is connected to a molten salt electric heating device in the molten salt heat exchange unit through a voltage reduction transformer, a high-temperature tank of the molten salt heat exchange unit is connected to a heat driving device in the industrial gas generation unit, and a heat exchanger in the industrial gas generation unit is connected to a low-temperature tank of the molten salt heat exchange unit.

In a further improvement of the present invention, the service molten salt heat storage and power supply unit includes: a #1 machine 20kV to 6.3kV split winding transformer, a #2 machine 20kV to 6.3kV split winding transformer, a #1 factory A section interconnection switch, a #1 factory B section interconnection switch, a #2 factory A section interconnection switch, a #2 factory B section interconnection switch, a 6kV1A section bus, a 6kV1B section bus, a 6kV2A section bus, a 6kV2B section bus, a 6kV1A section leading-in switch and a 6kV1B section leading-in switch, the system comprises a 6kV2A section incoming line switch, a 6kV2B section incoming line switch, an A set of fused salt heating device grid-connected switch, a B set of fused salt heating device grid-connected switch, a A, B set of fused salt heating device and C, D sets of fused salt heating device communication switch, a C set of fused salt heating device grid-connected switch, a D set of fused salt heating device grid-connected switch, an A set of fused salt heating device voltage reduction change, a B set of fused salt heating device voltage reduction change, a C set of fused salt heating device voltage reduction change and a D set of fused salt heating device voltage reduction change;

the 20kV becomes 6.3kV split winding transformer high pressure side and is connected to the generator export, and the electric energy comes from the generator, two branches in the 20kV becomes 6.3kV split winding transformer low pressure side are connected with respectively: the section A for the 6.3kV alternating current plant and the section B for the 6.3kV alternating current plant; taking a plant A branch as an example, the plant AC load is connected to the 6.3kV AC plant A section through the AC load switch, the low-voltage side of the 6.3kV to 10kV double-winding transformer is connected to the 6.3kV AC plant A section through the plant AC-plant DC interconnection switch, and the low-voltage side of the 6.3kV to 10kV double-winding transformer is connected with the medium-voltage DC bus through the bidirectional PCS converter; the high-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 generator is connected to the outlet of the #1 generator, electric energy is from the generator, the high-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #2 generator is connected to the outlet of the #2 generator, and the electric energy is from the generator; the 6kV1A section bus is connected with the A section at the low-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 machine through the A section interconnection switch for the #1 machine factory, and the 6kV1B section bus is connected with the B section at the low-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 machine factory through the B section interconnection switch for the #1 machine factory; the 6kV2A section bus is connected with the A section at the low-voltage side of the #2 machine 20 kV-to-6.3 kV split winding transformer through the A section interconnection switch for the #2 machine factory, and the 6kV2B section bus is connected with the B section at the low-voltage side of the #2 machine 20 kV-to-6.3 kV split winding transformer through the B section interconnection switch for the #2 machine factory; 6kV1A section service entrance switch with 6kV1A section generating line is connected, 6kV1B section service entrance switch with 6kV1B section generating line is connected, 6kV2A section service entrance switch with 6kV2A section generating line is connected, 6kV2B section service entrance switch with 6kV2B section generating line is connected.

In a further improvement of the utility model, the voltage-reducing high-voltage side of the A set of molten salt heating device is connected with the 6kV1A section incoming line switch and the 6kV2A section incoming line switch through the A set of molten salt heating device grid-connected switch, and the voltage-reducing high-voltage side of the B set of molten salt heating device is connected with the 6kV1A section incoming line switch and the 6kV2A section incoming line switch through the B set of molten salt heating device grid-connected switch; the voltage-reducing and high-voltage-changing side of the C-set molten salt heating device is connected with the 6kV1B section incoming line switch and the 6kV2B section incoming line switch through the C-set molten salt heating device grid-connected switch, and the voltage-reducing and high-voltage-changing side of the D-set molten salt heating device is connected with the 6kV1B section incoming line switch and the 6kV2B section incoming line switch through the D-set molten salt heating device grid-connected switch; the A set of molten salt heating device grid-connected switch, the B set of molten salt heating device grid-connected switch, the C set of molten salt heating device grid-connected switch and the D set of molten salt heating device grid-connected switch are connected with the C, D set of molten salt heating device communication switch through the A, B set of molten salt heating device.

The further improvement of the utility model is that in order to avoid loop closing operation, an interlocking function is arranged between the incoming line switch of the 6kV1A section and the incoming line switch of the 6kV2A section, and an interlocking function is arranged between the incoming line switch of the 6kV1B section and the incoming line switch of the 6kV2B section.

A further improvement of the utility model is that the molten salt heat exchange unit comprises: the system comprises a molten salt heating device A, a molten salt heating device B, a molten salt heating device C, a molten salt heating device D, a low-temperature molten salt water inlet valve of the heating device A of the low-temperature tank, a low-temperature molten salt water inlet valve of the heating device B of the low-temperature tank, a low-temperature molten salt water inlet valve of the heating device C of the low-temperature tank, a high-temperature molten salt water outlet valve of the heating device A of the low-temperature molten salt water inlet valve of the heating device D of the low-temperature tank, a high-temperature molten salt water outlet valve of the heating device B of the high-temperature tank, a high-temperature molten salt water outlet valve of the heating device C of the high-temperature tank, a high-temperature molten salt water outlet valve of the heating device D of the high-temperature tank, a liquid molten salt low-temperature tank and a liquid molten salt high-temperature tank;

the A set of molten salt heating device is connected to the reduced pressure and low pressure side of the A set of molten salt heating device, the B set of molten salt heating device is connected to the reduced pressure and low pressure side of the B set of molten salt heating device, the C set of molten salt heating device is connected to the reduced pressure and low pressure side of the C set of molten salt heating device, and the D set of molten salt heating device is connected to the reduced pressure and low pressure side of the D set of molten salt heating device; the A set of molten salt heating device is operated by closing the grid-connected switch of the A set of molten salt heating device, or by closing the incoming line switch of the 6kV1A section and then connecting the incoming line switch of the 6kV1A section of bus, or by closing the grid-connected switch of the A set of molten salt heating device and then connecting the incoming line switch of the 6kV2A section and then connecting the incoming line switch of the 6kV2A section of bus; the operation of the B sets of molten salt heating devices is realized by closing the grid-connected switch of the B sets of molten salt heating devices, closing the incoming line switch of the 6kV1A section and then connecting the incoming line switch of the 6kV1A section, or by closing the grid-connected switch of the B sets of molten salt heating devices, closing the incoming line switch of the 6kV2A section and then connecting the incoming line switch of the 6kV2A section; the C sets of molten salt heating devices operate by closing grid-connected switches of the C sets of molten salt heating devices, and connecting the 6kV1B section of bus after closing the 6kV1B section of incoming line switches, or by closing the grid-connected switches of the C sets of molten salt heating devices, and connecting the 6kV2B section of bus after closing the 6kV2B section of incoming line switches; the D sets of molten salt heating devices are operated by closing the grid-connected switch of the D sets of molten salt heating devices and connecting the 6kV1B section of bus after closing the 6kV1B section of incoming line switch, or by closing the grid-connected switch of the D sets of molten salt heating devices and connecting the 6kV2B section of bus after closing the 6kV2B section of incoming line switch.

The liquid molten salt low-temperature tank is connected with the A set of molten salt heating device through the A set of heating device low-temperature molten salt water inlet valve of the low-temperature tank, connected with the B set of molten salt heating device through the B set of heating device of the low-temperature tank, connected with the C set of molten salt heating device through the C set of heating device low-temperature molten salt water inlet valve of the low-temperature tank, and connected with the D set of molten salt heating device through the D set of heating device low-temperature molten salt water inlet valve of the low-temperature tank;

the liquid molten salt high-temperature tank is connected with the A set of molten salt heating device through the A set of heating device high-temperature molten salt outlet valve of the high-temperature tank, the liquid molten salt high-temperature tank is connected with the B set of molten salt heating device through the B set of heating device high-temperature molten salt outlet valve of the high-temperature tank, the liquid molten salt high-temperature tank is connected with the C set of molten salt heating device through the C set of heating device high-temperature molten salt outlet valve of the high-temperature tank, and the liquid molten salt high-temperature tank is connected with the D set of molten salt heating device through the D set of heating device high-temperature molten salt outlet valve of the high-temperature tank.

The utility model has the further improvement that the temperature control of the liquid molten salt is realized by controlling the on and off of the low-temperature molten salt inlet valve of the heating device of the low-temperature tank A, the low-temperature molten salt inlet valve of the heating device of the low-temperature tank B, the low-temperature molten salt inlet valve of the heating device of the low-temperature tank C and the low-temperature molten salt inlet valve of the heating device of the low-temperature tank D;

the control of the pressure of the liquid molten salt is realized by controlling the opening and closing of the high-temperature molten salt outlet valve of the heating device of the high-temperature tank A, the high-temperature molten salt outlet valve of the heating device of the high-temperature tank B, the high-temperature molten salt outlet valve of the heating device of the high-temperature tank C and the high-temperature molten salt outlet valve of the heating device of the high-temperature tank D.

In a further development of the utility model, the industrial gas generation unit comprises: the system comprises industrial deaerated water, a deaerated water inlet valve, a deaerated water booster pump, a salt-water heat exchanger, a high-temperature liquid molten salt heat driving device, a high-temperature steam outlet valve, an industrial gas device and a low-temperature liquid molten salt inlet valve;

high-temperature liquid molten salt in the liquid molten salt high-temperature tank enters the salt-water heat exchanger through the thermal driving device, the industrial deoxygenated water enters the salt-water heat exchanger through the deoxygenated water inlet valve and the deoxygenated water booster pump, the high-temperature liquid molten salt heats the industrial high-pressure deoxygenated water to a temperature higher than 260 ℃ to form industrial high-pressure water vapor, and the industrial high-pressure water vapor is supplied to the industrial gas device through the high-temperature water vapor outlet valve; the temperature of the high-temperature liquid molten salt passing through the salt-water heat exchanger is reduced, the high-temperature liquid molten salt enters the liquid molten salt low-temperature tank through the low-temperature liquid molten salt inlet valve, and the low-temperature liquid molten salt participates in the next molten salt heat storage and steam supply cycle.

Compared with the prior art, the utility model has at least the following beneficial technical effects:

1. according to the utility model, the interlocking function is arranged between the grid-connected switches of different units of the service molten salt heat storage and power supply unit, and the interlocking function is arranged between the inlet wire switches of different units, so that the closed-loop operation of the molten salt heat storage systems of the two units can be effectively prevented.

2. The electric energy of the molten salt electric heating device is from station power, the power supply through an external power grid is not needed, and the cost of the electric charge can be controlled.

3. According to the utility model, a heating resistance wire and an automatic zero crossing point judging switch are adopted in the molten salt electric heating device, and the temperature of the high-temperature tank in the molten salt heat exchange unit is controlled by closing or opening the automatic zero crossing point judging switch.

4. The heat energy of the industrial gas generation unit is from the molten salt heat exchange unit, so that the condition that the industrial hot water steam of the conventional thermal power heating system is from the intermediate pressure cylinder is avoided, the original thermal power heating system is not required to be modified, and the investment cost is saved.

Drawings

FIG. 1 is a diagram of an electric molten salt heat storage and steam supply system for thermal power plant.

Description of reference numerals:

1, an industrial molten salt heat storage and power supply unit; 2-molten salt heat exchange unit; 3-industrial gas generation unit. 1- #1 machine 20kV to 6.3kV split winding transformer; 1-2- #2 machine 20kV to 6.3kV split winding transformer; 1-3- #1 factory-used A-section interconnection switch; 1-4- #1 machine shop contact switch of section B; 1-5- #2 factory-used A-section interconnection switch; 1-6- #2 factory-used B-section interconnection switch; 1-7-6 kV1A section of bus; 1-8-6 kV1B section of bus; 1-9-6 kV2A section of bus; 1-10-6 kV2B section of bus; 1-11-6 kV1A section incoming line switch; 1-12-6 kV1B section incoming line switch; 1-13-6 kV2A section incoming line switch; 1-14-6 kV2B section incoming line switch; 1-15-A sets of fused salt heating devices are connected with a grid switch; 1-16-B sets of molten salt heating devices are connected with a grid switch; 1-17-A, B sets of molten salt heating devices and C, D sets of molten salt heating device communication switches; 1-18-C sets of fused salt heating devices are connected with a grid switch; 1-19-D sets of fused salt heating devices are connected with a grid switch; 1-20-A sets of fused salt heating device for reducing pressure; 1-21-B sets of fused salt heating device for reducing pressure; 1-22-C sets of molten salt heating devices reduce pressure; 1-23-D sets of molten salt heating device for reducing pressure. 2-1-A sets of molten salt heating devices; 2-B sets of molten salt heating devices; 2-3-C sets of molten salt heating devices; 2-4-D sets of molten salt heating devices; 2-5 parts of a low-temperature molten salt inlet valve of a heating device of a low-temperature tank A; 2-6-low temperature molten salt inlet valves of a heating device of a low temperature tank B set; 2-7-low temperature molten salt inlet valve of the heating device of the low temperature tank C set; 2-8-low-temperature molten salt inlet valves of a heating device of a low-temperature tank D set; 2-9-high temperature molten salt outlet valve of the heating device of the high temperature tank A set; 2-10-high temperature molten salt outlet valve of heating device B set of high temperature tank; 2-11-high temperature molten salt outlet valve of the heating device of the high temperature tank C set; 2-12-high temperature tank D set heating device high temperature fused salt outlet valve; 2-13-liquid molten salt low-temperature tank; 2-14-liquid molten salt high-temperature tank. 3-1-industrial deoxygenated water; 3-2-a deaerated water inlet valve; 3-deaerated water booster pump; 3-4-salt-water heat exchanger; 3-5-high temperature liquid molten salt heat driving device; 3-6-high temperature steam outlet valve; 3-7-industrial gas-using device; 3-8 parts of a low-temperature liquid molten salt inlet valve.

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 and steam supply system for thermal power plant provided by the utility model comprises: the industrial molten salt heat storage and power supply system comprises an industrial molten salt heat storage and power supply unit 1, a molten salt heat exchange unit 2 and an industrial gas generation unit 3; the industrial molten salt heat storage and power supply unit 1 is connected to an outlet of a power generator through a high-voltage transformer, the industrial molten salt heat storage and power supply unit 1 is connected to a molten salt electric heating device in the molten salt heat exchange unit 2 through a voltage reduction and low-voltage transformer, a high-temperature tank of the molten salt heat exchange unit 2 is connected to a heat driving device in the industrial gas generation unit 3, and a heat exchanger in the industrial gas generation unit 3 is connected to a low-temperature tank of the molten salt heat exchange unit 2.

The service molten salt heat storage and power supply unit 1 includes: 1-1 part of #1 machine 20 kV-to-6.3 kV split winding transformer, 1-2 parts of #2 machine 20 kV-to-6.3 kV split winding transformer, 1-3 parts of #1 plant A section interconnection switch, 1-4 parts of #1 plant B section interconnection switch, 1-5 parts of #2 plant A section interconnection switch, 1-6 parts of #2 plant B section interconnection switch, 1-7 parts of 6kV1A section bus, 1-8 parts of 6kV1B section bus, 1-9 parts of 6kV2A section bus, 1-10 parts of 6kV2B section bus, 1-11 parts of 6kV1A section incoming line switch, 1-12 parts of 6kV1B section incoming line switch, 1-13 parts of 6kV2A section incoming line switch, 1-14 parts of 6kV2B section incoming line switch, 1-15 parts of A sleeve fused salt heating device, 1-16 parts of B sleeve fused salt heating device, 1-16 parts of A, B sleeve fused salt heating device and C sleeve fused salt heating device, The device comprises a D set of fused salt heating device communication switch 1-17, a C set of fused salt heating device grid-connected switch 1-18, a D set of fused salt heating device grid-connected switch 1-19, an A set of fused salt heating device voltage reduction transformer 1-20, a B set of fused salt heating device voltage reduction transformer 1-21, a C set of fused salt heating device voltage reduction transformer 1-22 and a D set of fused salt heating device voltage reduction transformer 1-23.

The molten salt heat exchange unit 2 includes: 2-1 of a set of fused salt heating device A, 2-2 of a set of fused salt heating device B, 2-3 of a set of fused salt heating device C, 2-4 of a set of fused salt heating device D, 2-5 of a low-temperature fused salt water inlet valve of a set of heating device A of a low-temperature tank, 2-6 of a low-temperature fused salt water inlet valve of a set of heating device B of the low-temperature tank, 2-7 of a low-temperature fused salt water inlet valve of a set of heating device C of the low-temperature tank, 2-8 parts of low-temperature molten salt inlet valve of a heating device of a low-temperature tank D, 2-9 parts of high-temperature molten salt outlet valve of a heating device of a high-temperature tank A, 2-10 parts of high-temperature molten salt outlet valve of a heating device of a high-temperature tank B, 2-11 parts of high-temperature molten salt outlet valve of a heating device of a high-temperature tank C, 2-12 parts of high-temperature molten salt outlet valve of a heating device of a high-temperature tank D, 2-13 parts of liquid molten salt low-temperature tank and 2-14 parts of liquid molten salt high-temperature tank.

The industrial gas generation unit 3 includes: 3-1 parts of industrial deoxygenated water, 3-2 parts of a deoxygenated water inlet valve, 3-3 parts of a deoxygenated water booster pump, 3-4 parts of a salt-water heat exchanger, 3-5 parts of a high-temperature liquid molten salt heat driving device, 3-6 parts of a high-temperature water vapor outlet valve, 3-7 parts of an industrial gas device and 3-8 parts of a low-temperature liquid molten salt inlet valve.

The high-voltage side of the #1 machine 20 kV-to-6.3 kV split winding transformer 1-1 is connected to the outlet of a #1 generator, electric energy is from the generator, the high-voltage side of the #2 machine 20 kV-to-6.3 kV split winding transformer 1-2 is connected to the outlet of a #2 generator, and the electric energy is from the generator. The 6kV1A section bus 1-7 is connected with the A section of the low-voltage side of the 20kV to 6.3kV split winding transformer 1-1 of the #1 machine through the A section interconnection switch 1-3 of the #1 machine factory, and the 6kV1B section bus 1-8 is connected with the B section of the low-voltage side of the 20kV to 6.3kV split winding transformer 1-1 of the #1 machine factory through the B section interconnection switch 1-4 of the #1 machine factory.

The 6kV2A section bus 1-9 is connected with the A section of the low-voltage side of the 20kV to 6.3kV split winding transformer 1-2 of the #2 machine through the A section interconnection switch 1-5 of the #2 machine factory, and the 6kV2B section bus 1-10 is connected with the B section of the low-voltage side of the 20kV to 6.3kV split winding transformer 1-2 of the #2 machine factory through the B section interconnection switch 1-6 of the #2 machine factory. The section 6kV1A incoming line switch 1-11 is connected with the section 6kV1A bus bar 1-7, the section 6kV1B incoming line switch 1-12 is connected with the section 6kV1B bus bar 1-8, the section 6kV2A incoming line switch 1-13 is connected with the section 6kV2A bus bar 1-9, and the section 6kV2B incoming line switch 1-14 is connected with the section 6kV2B bus bar 1-10.

The voltage reduction of the A set of molten salt heating device is changed to 1-20 high voltage side and is connected with the 6kV1A section incoming line switch 1-11 and the 6kV2A section incoming line switch 1-13 through the A set of molten salt heating device grid-connected switch 1-15, and the voltage reduction of the B set of molten salt heating device is changed to 1-21 high voltage side and is connected with the 6kV1A section incoming line switch 1-11 and the 6kV2A section incoming line switch 1-13 through the B set of molten salt heating device grid-connected switch 1-16. The C-set molten salt heating device voltage reduction transformer 1-22 high-voltage side is connected with the 6kV1B section incoming line switch 1-12 and the 6kV2B section incoming line switch 1-14 through the C-set molten salt heating device grid-connected switch 1-18, and the D-set molten salt heating device voltage reduction transformer 1-23 high-voltage side is connected with the 6kV1B section incoming line switch 1-12 and the 6kV2B section incoming line switch 1-14 through the D-set molten salt heating device grid-connected switch 1-19. The A set of molten salt heating device grid-connected switches 1-15, the B set of molten salt heating device grid-connected switches 1-16, the C set of molten salt heating device grid-connected switches 1-18 and the D set of molten salt heating device grid-connected switches 1-19 are connected with C, D set of molten salt heating device communication switches 1-17 through the A, B set of molten salt heating devices. In order to avoid loop closing operation, an interlocking function is arranged between the 6kV1A section incoming line switch 1-11 and the 6kV2A section incoming line switch 1-13, and an interlocking function is arranged between the 6kV1B section incoming line switch 1-12 and the 6kV2B section incoming line switch 1-14.

The A set of molten salt heating device 2-1 is connected to the A set of molten salt heating device pressure reduction and change 1-20 low pressure side, the B set of molten salt heating device 2-2 is connected to the B set of molten salt heating device pressure reduction and change 1-21 low pressure side, the C set of molten salt heating device 2-3 is connected to the C set of molten salt heating device pressure reduction and change 1-22 low pressure side, the D set of molten salt heating device 2-4 is connected to the D set of molten salt heating device pressure reduction and change 1-23 low pressure side.

The operation of the A set of molten salt heating device 2-1 can be realized by closing a grid-connected switch 1-15 of the A set of molten salt heating device, switching in a bus 1-7 of the 6kV1A section after closing a wire-incoming switch 1-11 of the 6kV1A section, or switching in a bus 1-9 of the 6kV2A section after closing a grid-connected switch 1-15 of the A set of molten salt heating device and switching in a wire-incoming switch 1-13 of the 6kV2A section. The operation of the B set of molten salt heating device 2-2 can be realized by closing the grid-connected switch 1-16 of the B set of molten salt heating device and switching in the 6kV1A section of bus 1-7 after closing the 6kV1A section of incoming line switch 1-11, or can be realized by closing the grid-connected switch 1-16 of the B set of molten salt heating device and switching in the 6kV2A section of bus 1-9 after closing the 6kV2A section of incoming line switch 1-13. The operation of the C-set molten salt heating devices 2-3 can be realized by closing grid-connected switches 1-18 of the C-set molten salt heating devices, switching in 6kV1B bus bars 1-8 after closing the 6kV1B section incoming line switches 1-12, or switching in 6kV2B bus bars 1-10 after closing the C-set molten salt heating device grid-connected switches 1-18 and switching in 6kV2B section incoming line switches 1-14. The operation of the D sets of molten salt heating devices 2-4 can be realized by closing grid-connected switches 1-19 of the D sets of molten salt heating devices and switching in the 6kV1B bus 1-8 after closing the 6kV1B section incoming line switches 1-12, or by closing the grid-connected switches 1-19 of the D sets of molten salt heating devices and switching in the 6kV2B bus 1-10 after closing the 6kV2B section incoming line switches 1-14.

The liquid molten salt low-temperature tank 2-13 is connected with the A set of molten salt heating device 2-1 through the A set of heating device low-temperature molten salt water inlet valve 2-5 of the low-temperature tank, connected with the B set of molten salt heating device 2-2 through the B set of heating device low-temperature molten salt water inlet valve 2-6 of the low-temperature tank, connected with the C set of molten salt heating device 2-3 through the C set of heating device low-temperature molten salt water inlet valve 2-7 of the low-temperature tank, and connected with the D set of molten salt heating device 2-4 through the D set of heating device low-temperature molten salt water inlet valve 2-8 of the low-temperature tank. The temperature control of the liquid molten salt is realized by controlling the on-off of 2-5 parts of the low-temperature molten salt inlet valve of the A set of heating device of the low-temperature tank, 2-6 parts of the low-temperature molten salt inlet valve of the B set of heating device of the low-temperature tank, 2-7 parts of the low-temperature molten salt inlet valve of the C set of heating device of the low-temperature tank and 2-8 parts of the low-temperature molten salt inlet valve of the D set of heating device of the low-temperature tank.

The liquid molten salt high-temperature tank 2-14 is connected with the A set of molten salt heating device 2-1 through the A set of heating device high-temperature molten salt outlet valve 2-9 of the high-temperature tank, the liquid molten salt high-temperature tank 2-14 is connected with the B set of molten salt heating device 2-2 through the B set of heating device high-temperature molten salt outlet valve 2-10 of the high-temperature tank, the liquid molten salt high-temperature tank 2-14 is connected with the C set of molten salt heating device 2-3 through the C set of heating device high-temperature molten salt outlet valve 2-11 of the high-temperature tank, and the liquid molten salt high-temperature tank 2-14 is connected with the D set of molten salt heating device 2-4 through the D set of heating device high-temperature molten salt outlet valve 2-12 of the high-temperature tank. And controlling the high-temperature molten salt outlet valve 2-9 of the high-temperature tank A set of heating device, the high-temperature molten salt outlet valve 2-10 of the high-temperature tank B set of heating device, the high-temperature molten salt outlet valve 2-11 of the high-temperature tank C set of heating device and the high-temperature molten salt outlet valve 2-12 of the high-temperature tank D set of heating device to be opened and closed, so that the pressure control of the liquid molten salt is realized.

The high-temperature liquid molten salt in the liquid molten salt high-temperature tank 2-14 enters the salt-water heat exchanger 3-4 through the thermal driving device 3-5, the industrial deoxygenated water 3-1 enters the salt-water heat exchanger 3-4 through the deoxygenated water inlet valve 3-2 and the deoxygenated water booster pump 3-3, the high-temperature liquid molten salt heats the industrial high-pressure deoxygenated water to a temperature higher than 260 ℃ to form industrial high-pressure water vapor, and the industrial gas device 3-7 is supplied with steam through the high-temperature water vapor outlet valve 3-6. The temperature of the high-temperature liquid molten salt passing through the salt-water heat exchanger 3-4 is reduced, the high-temperature liquid molten salt enters the liquid molten salt low-temperature tank 2-13 through the low-temperature liquid molten salt inlet valve 3-8, and the low-temperature liquid molten salt participates in the next molten salt heat storage and steam supply cycle.

Claims (8)

1. Fused salt heat storage steam supply system for thermal power plant, its characterized in that includes: the industrial molten salt heat storage and power supply unit, the molten salt heat exchange unit and the industrial gas generation unit;

the industrial molten salt heat storage and power supply unit is connected to an outlet of a power generator through a high transformer, the industrial molten salt heat storage and power supply unit is connected to a molten salt electric heating device in the molten salt heat exchange unit through a voltage reduction transformer, a high-temperature tank of the molten salt heat exchange unit is connected to a heat driving device in the industrial gas generation unit, and a heat exchanger in the industrial gas generation unit is connected to a low-temperature tank of the molten salt heat exchange unit.

2. The thermal power plant service electrical molten salt heat storage and steam supply system according to claim 1, wherein the service electrical molten salt heat storage and power supply unit comprises: a #1 machine 20kV to 6.3kV split winding transformer, a #2 machine 20kV to 6.3kV split winding transformer, a #1 factory A section interconnection switch, a #1 factory B section interconnection switch, a #2 factory A section interconnection switch, a #2 factory B section interconnection switch, a 6kV1A section bus, a 6kV1B section bus, a 6kV2A section bus, a 6kV2B section bus, a 6kV1A section leading-in switch and a 6kV1B section leading-in switch, the system comprises a 6kV2A section incoming line switch, a 6kV2B section incoming line switch, an A set of fused salt heating device grid-connected switch, a B set of fused salt heating device grid-connected switch, a A, B set of fused salt heating device and C, D sets of fused salt heating device communication switch, a C set of fused salt heating device grid-connected switch, a D set of fused salt heating device grid-connected switch, an A set of fused salt heating device voltage reduction change, a B set of fused salt heating device voltage reduction change, a C set of fused salt heating device voltage reduction change and a D set of fused salt heating device voltage reduction change;

the 20kV becomes 6.3kV split winding transformer high pressure side and is connected to the generator export, and the electric energy comes from the generator, two branches in the 20kV becomes 6.3kV split winding transformer low pressure side are connected with respectively: the section A for the 6.3kV alternating current plant and the section B for the 6.3kV alternating current plant; when the branch is a plant A branch, a plant AC load is connected to the 6.3kV AC plant A section through an AC load switch, the low-voltage side of the 6.3kV to 10kV double-winding transformer is connected to the 6.3kV AC plant A section through the plant AC-plant DC interconnection switch, and the low-voltage side of the 6.3kV to 10kV double-winding transformer is connected to a medium-voltage DC bus through a bidirectional PCS converter; the high-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 generator is connected to the outlet of the #1 generator, electric energy is from the generator, the high-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #2 generator is connected to the outlet of the #2 generator, and the electric energy is from the generator; the 6kV1A section bus is connected with the A section at the low-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 machine through the A section interconnection switch for the #1 machine factory, and the 6kV1B section bus is connected with the B section at the low-voltage side of the 20 kV-to-6.3 kV split winding transformer of the #1 machine factory through the B section interconnection switch for the #1 machine factory; the 6kV2A section bus is connected with the A section at the low-voltage side of the #2 machine 20 kV-to-6.3 kV split winding transformer through the A section interconnection switch for the #2 machine factory, and the 6kV2B section bus is connected with the B section at the low-voltage side of the #2 machine 20 kV-to-6.3 kV split winding transformer through the B section interconnection switch for the #2 machine factory; 6kV1A section service entrance switch with 6kV1A section generating line is connected, 6kV1B section service entrance switch with 6kV1B section generating line is connected, 6kV2A section service entrance switch with 6kV2A section generating line is connected, 6kV2B section service entrance switch with 6kV2B section generating line is connected.

3. The molten salt heat storage and steam supply system for thermal power plant according to claim 2, wherein the voltage reduction and high voltage side of the A set of molten salt heating device is connected with the 6kV1A section incoming line switch and the 6kV2A section incoming line switch through the A set of molten salt heating device grid-connected switch, and the voltage reduction and high voltage side of the B set of molten salt heating device is connected with the 6kV1A section incoming line switch and the 6kV2A section incoming line switch through the B set of molten salt heating device grid-connected switch; the voltage-reducing and high-voltage-changing side of the C-set molten salt heating device is connected with the 6kV1B section incoming line switch and the 6kV2B section incoming line switch through the C-set molten salt heating device grid-connected switch, and the voltage-reducing and high-voltage-changing side of the D-set molten salt heating device is connected with the 6kV1B section incoming line switch and the 6kV2B section incoming line switch through the D-set molten salt heating device grid-connected switch; the A set of molten salt heating device grid-connected switch, the B set of molten salt heating device grid-connected switch, the C set of molten salt heating device grid-connected switch and the D set of molten salt heating device grid-connected switch are connected with the C, D set of molten salt heating device communication switch through the A, B set of molten salt heating device.

4. The fused salt heat storage and steam supply system for thermal power plant as claimed in claim 3, wherein in order to avoid loop closing operation, an interlocking function is provided between the 6kV1A section incoming line switch and the 6kV2A section incoming line switch, and an interlocking function is provided between the 6kV1B section incoming line switch and the 6kV2B section incoming line switch.

5. The molten salt heat storage and steam supply system for thermal power plant according to claim 3, wherein the molten salt heat exchange unit comprises: the system comprises a molten salt heating device A, a molten salt heating device B, a molten salt heating device C, a molten salt heating device D, a low-temperature molten salt water inlet valve of the heating device A of the low-temperature tank, a low-temperature molten salt water inlet valve of the heating device B of the low-temperature tank, a low-temperature molten salt water inlet valve of the heating device C of the low-temperature tank, a high-temperature molten salt water outlet valve of the heating device A of the low-temperature molten salt water inlet valve of the heating device D of the low-temperature tank, a high-temperature molten salt water outlet valve of the heating device B of the high-temperature tank, a high-temperature molten salt water outlet valve of the heating device C of the high-temperature tank, a high-temperature molten salt water outlet valve of the heating device D of the high-temperature tank, a liquid molten salt low-temperature tank and a liquid molten salt high-temperature tank;

the A set of molten salt heating device is connected to the reduced pressure and low pressure side of the A set of molten salt heating device, the B set of molten salt heating device is connected to the reduced pressure and low pressure side of the B set of molten salt heating device, the C set of molten salt heating device is connected to the reduced pressure and low pressure side of the C set of molten salt heating device, and the D set of molten salt heating device is connected to the reduced pressure and low pressure side of the D set of molten salt heating device; the A set of molten salt heating device is operated by closing the grid-connected switch of the A set of molten salt heating device, or by closing the incoming line switch of the 6kV1A section and then connecting the incoming line switch of the 6kV1A section of bus, or by closing the grid-connected switch of the A set of molten salt heating device and then connecting the incoming line switch of the 6kV2A section and then connecting the incoming line switch of the 6kV2A section of bus; the operation of the B sets of molten salt heating devices is realized by closing the grid-connected switch of the B sets of molten salt heating devices, closing the incoming line switch of the 6kV1A section and then connecting the incoming line switch of the 6kV1A section, or by closing the grid-connected switch of the B sets of molten salt heating devices, closing the incoming line switch of the 6kV2A section and then connecting the incoming line switch of the 6kV2A section; the C sets of molten salt heating devices operate by closing grid-connected switches of the C sets of molten salt heating devices, and connecting the 6kV1B section of bus after closing the 6kV1B section of incoming line switches, or by closing the grid-connected switches of the C sets of molten salt heating devices, and connecting the 6kV2B section of bus after closing the 6kV2B section of incoming line switches; the D sets of molten salt heating devices are operated by closing the grid-connected switch of the D sets of molten salt heating devices and connecting the 6kV1B section of bus after closing the 6kV1B section of incoming line switch, or by closing the grid-connected switch of the D sets of molten salt heating devices and connecting the 6kV2B section of bus after closing the 6kV2B section of incoming line switch.

6. The fused salt heat storage and steam supply system for thermal power plant according to claim 5, wherein the liquid fused salt low-temperature tank is connected with the A sets of fused salt heating devices through the A sets of heating devices of the low-temperature tank, is connected with the B sets of fused salt heating devices through the B sets of heating devices of the low-temperature tank, is connected with the C sets of fused salt heating devices through the C sets of heating devices of the low-temperature tank, and is connected with the D sets of fused salt heating devices through the D sets of heating devices of the low-temperature tank;

the liquid molten salt high-temperature tank is connected with the A set of molten salt heating device through the A set of heating device high-temperature molten salt outlet valve of the high-temperature tank, the liquid molten salt high-temperature tank is connected with the B set of molten salt heating device through the B set of heating device high-temperature molten salt outlet valve of the high-temperature tank, the liquid molten salt high-temperature tank is connected with the C set of molten salt heating device through the C set of heating device high-temperature molten salt outlet valve of the high-temperature tank, and the liquid molten salt high-temperature tank is connected with the D set of molten salt heating device through the D set of heating device high-temperature molten salt outlet valve of the high-temperature tank.

7. The molten salt heat storage and steam supply system for thermal power plant according to claim 6, wherein the liquid molten salt temperature control is realized by controlling the opening and closing of the A set of heating device low-temperature molten salt inlet valves of the low-temperature tank, the B set of heating device low-temperature molten salt inlet valves of the low-temperature tank, the C set of heating device low-temperature molten salt inlet valves of the low-temperature tank and the D set of heating device low-temperature molten salt inlet valves of the low-temperature tank;

the control of the pressure of the liquid molten salt is realized by controlling the opening and closing of the high-temperature molten salt outlet valve of the heating device of the high-temperature tank A, the high-temperature molten salt outlet valve of the heating device of the high-temperature tank B, the high-temperature molten salt outlet valve of the heating device of the high-temperature tank C and the high-temperature molten salt outlet valve of the heating device of the high-temperature tank D.

8. The molten salt heat storage and steam supply system for thermal power plant according to claim 6, wherein the industrial gas generation unit comprises: the system comprises industrial deaerated water, a deaerated water inlet valve, a deaerated water booster pump, a salt-water heat exchanger, a high-temperature liquid molten salt heat driving device, a high-temperature steam outlet valve, an industrial gas device and a low-temperature liquid molten salt inlet valve;

high-temperature liquid molten salt in the liquid molten salt high-temperature tank enters the salt-water heat exchanger through the thermal driving device, the industrial deoxygenated water enters the salt-water heat exchanger through the deoxygenated water inlet valve and the deoxygenated water booster pump, the high-temperature liquid molten salt heats the industrial high-pressure deoxygenated water to a temperature higher than 260 ℃ to form industrial high-pressure water vapor, and the industrial high-pressure water vapor is supplied to the industrial gas device through the high-temperature water vapor outlet valve; the temperature of the high-temperature liquid molten salt passing through the salt-water heat exchanger is reduced, the high-temperature liquid molten salt enters the liquid molten salt low-temperature tank through the low-temperature liquid molten salt inlet valve, and the low-temperature liquid molten salt participates in the next molten salt heat storage and steam supply cycle.

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