Steam heat utilization system for improving peak regulation reliability of heat storage auxiliary thermoelectric unit

Abstract

The utility model discloses a steam heat utilization system for improving the peak regulation reliability of a heat storage auxiliary thermoelectric unit, which comprises a turboset, a low-temperature fused salt storage tank, a high-temperature fused salt storage tank, a fused salt heat storage mechanism, a fused salt heat release mechanism, a fused salt heat release starting mechanism, an industrial steam supply mechanism and an industrial steam supply main pipe. The fused salt heat storage mechanism uses hot resteam and electric energy to heat fused salt for heat storage, then the cooled hot resteam supplies heat to the outside, and when the system is subjected to load rising and peak shaving, firstly, the fused salt heat release starting mechanism uses the electric energy to generate saturated steam to assist the fused salt heat release mechanism to start and operate; and superheated steam generated by heat release of the high-temperature fused salt is used for supplying heat to the outside, and after the fused salt heat release mechanism stably operates, the fused salt heat release starting mechanism stops operating. By reasonably designing the technological process of fused salt heat storage and heat release, the gradient utilization of energy is realized, the operation energy efficiency of the system is increased, and the safety and reliability of the operation of the system are also realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of cogeneration, and specifically relates to a steam heat utilization system for improving the peak-shaving reliability of a heat storage-assisted thermal power unit, and is particularly suitable for a cogeneration unit for power peak-shaving. Background Art

[0002] At present, increasing the proportion of flexible power sources in the power grid to improve the grid's ability to absorb new energy power is a key task in the construction of new power systems. For industrial heating units, due to the high quality of steam for heating, molten salt heat storage technology is the best energy storage technology for the flexibility transformation of industrial heating units. This technology is relatively mature. With its advantages of long cycle, large capacity, and low cost, it can adjust the fluctuations of new energy power generation over a longer time dimension and truly achieve the "peak shaving and valley filling" of the power grid.

[0003] At present, the main technical measures for the combined heat and power unit to use molten salt heat storage for power peak regulation include: in the heat storage process, the energy generated by the unit such as high-pressure steam, high-temperature flue gas or electricity is mainly used to heat the low-temperature molten salt for heat storage, thereby realizing the peak regulation of the unit's power load reduction; in the heat release process, the high-temperature molten salt is used to release heat to produce steam with different parameters, which is used to replace the unit's external heat supply or for the unit to generate power, thereby realizing the peak regulation of the unit's power load increase. However, the main deficiency of the existing technology is that in the heat release process, the high-temperature molten salt heat release is a multi-stage heat exchange process with step-by-step cooling. The cold source steam of the high-temperature section of the molten salt heat exchange comes from the steam generated by the low-temperature section of the molten salt heat exchange. When the heat release process is just started, the low-temperature section of the molten salt heat exchange cannot produce steam, resulting in the high-temperature section of the molten salt heat exchange having no cold source steam, which seriously affects the reliability and safety of the system's peak regulation operation. Utility Model Content

[0004] Based on the above situation, the utility model overcomes the above shortcomings in the prior art and proposes a steam heat utilization system with reasonable design and reliable performance for improving the peak-shaving reliability of heat storage-assisted thermal power units.

[0005] The technical solution adopted by the utility model to solve the above problems is: a steam heat utilization system for improving the peak-shaving reliability of heat storage auxiliary thermal power units, including a power station boiler and a steam turbine unit, the steam turbine unit including a high-pressure cylinder, a medium- and low-pressure cylinder, a generator, a condenser, a low-pressure regenerator, a deaerator, a boiler feed pump and a high-pressure regenerator, the steam inlet of the high-pressure cylinder is connected to the steam outlet of the superheater of the power station boiler, the steam exhaust port of the high-pressure cylinder is connected to the steam inlet of the reheater of the power station boiler, and the reheater outlet of the power station boiler is connected to the steam outlet of the reheater of the power station boiler. The steam port is connected to the steam inlet of the medium and low pressure cylinders, and the steam inlet of the medium and low pressure cylinders is installed with a regulating valve, the exhaust port of the medium and low pressure cylinders is connected to the exhaust steam inlet of the condenser, the high pressure cylinder and the medium and low pressure cylinders are coaxially connected and drive the generator to generate electricity, the condenser, low pressure regenerator, deaerator, boiler feed water pump and the water supply side of the high pressure regenerator are connected in sequence along the water flow direction, the water supply inlet of the boiler feed water pump is installed with a regulating valve, and the water supply outlet of the high pressure regenerator is connected to the water supply inlet of the power station boiler;

[0006] It is characterized in that it also includes: a low-temperature molten salt storage tank, a high-temperature molten salt storage tank, a molten salt heat storage mechanism, a molten salt heat release mechanism, a molten salt heat release starting mechanism, an industrial steam supply mechanism and an industrial steam supply main pipe, the molten salt outlet of the low-temperature molten salt storage tank is connected to the molten salt inlet of the molten salt heat storage mechanism, the molten salt outlet of the molten salt heat storage mechanism is connected to the molten salt inlet of the high-temperature molten salt storage tank, the steam inlet of the molten salt heat storage mechanism is connected to the steam outlet of the reheater of the power station boiler, the steam outlet of the molten salt heat storage mechanism is connected to the high-pressure steam inlet of the industrial steam supply mechanism, the drain outlet of the molten salt heat storage mechanism is connected to the water feed inlet of the deaerator, and the high-temperature molten The molten salt outlet of the salt storage tank is connected to the molten salt inlet of the molten salt heat release mechanism, the molten salt outlet of the molten salt heat release mechanism is connected to the molten salt inlet of the low-temperature molten salt storage tank, the water supply inlets of the molten salt heat release mechanism and the molten salt heat release starting mechanism are simultaneously connected to the water supply outlet of the deaerator through a water supply branch pipe, the steam outlet of the molten salt heat release starting mechanism is connected to the steam inlet of the molten salt heat release mechanism, the steam outlet of the molten salt heat release mechanism is connected to the industrial steam supply main pipe, the low-pressure steam inlet of the industrial steam supply mechanism is connected to the steam extraction port of the medium and low pressure cylinder through the industrial steam extraction pipe, and the medium-pressure steam outlet of the industrial steam supply mechanism is connected to the industrial steam supply main pipe.

[0007] Preferably, the molten salt heat storage mechanism comprises a low-temperature molten salt pump, a steam condensing heat exchanger, a high-pressure steam cooling heat exchanger and a molten salt electric heater, the low-temperature molten salt pump is arranged at the molten salt outlet of the low-temperature molten salt storage tank, the molten salt outlet of the low-temperature molten salt storage tank is also connected to the molten salt inlet of the steam condensing heat exchanger, and a regulating valve is installed at the molten salt outlet of the low-temperature molten salt storage tank, the steam condensing heat exchanger, the high-pressure steam cooling heat exchanger and the molten salt side of the molten salt electric heater are connected in series in sequence, the molten salt outlet of the molten salt electric heater is connected to the molten salt inlet of the high-temperature molten salt storage tank, and the high-pressure steam cooling heat exchanger is connected to the high-temperature molten salt outlet of the molten salt electric heater. The molten salt inlet of the salt storage tank is installed with a regulating valve, the steam inlet of the high-pressure steam cooling heat exchanger is connected to the steam outlet of the reheater of the power station boiler, and a regulating valve is installed at the steam inlet of the high-pressure steam cooling heat exchanger, the steam outlet of the high-pressure steam cooling heat exchanger is simultaneously connected to the high-pressure steam inlet of the industrial steam supply mechanism and the steam inlet of the steam condensing heat exchanger, and a regulating valve is installed at the steam inlet of the steam condensing heat exchanger, the drain outlet of the steam condensing heat exchanger is connected to the water feed inlet of the deaerator, and a regulating valve is installed at the drain outlet of the steam condensing heat exchanger.

[0008] Preferably, the molten salt heat release mechanism includes a high-temperature molten salt pump, a steam superheater, a steam generator and a heat release feed water pump, the high-temperature molten salt pump is arranged at the molten salt outlet of the high-temperature molten salt storage tank, the molten salt outlet of the high-temperature molten salt storage tank is connected to the molten salt inlet of the steam superheater, and a regulating valve is installed at the molten salt outlet of the high-temperature molten salt storage tank, the molten salt outlet of the steam superheater is connected to the molten salt inlet of the steam generator, the molten salt outlet of the steam generator is connected to the molten salt inlet of the low-temperature molten salt storage tank, and a regulating valve is installed at the molten salt inlet of the low-temperature molten salt storage tank The water inlet of the steam generator and the molten salt exothermic starting mechanism is connected to the water outlet of the deaerator through a water feed branch pipe, and a regulating valve is installed at the water inlet of the steam generator, and a heat release water feed pump and a regulating valve are installed on the water feed branch pipe. The steam inlet of the steam superheater is connected to the steam outlet of the steam generator and the molten salt exothermic starting mechanism at the same time, and a regulating valve is installed at the steam outlet of the steam generator. The steam outlet of the steam superheater is connected to the industrial steam supply main pipe, and a regulating valve is installed at the steam outlet of the steam superheater.

[0009] Preferably, the molten salt exothermic starting mechanism includes an electric heating steam generator, the water feed inlet of the electric heating steam generator is connected to the water feed outlet of the deaerator through a water feed branch pipe, and a regulating valve is installed at the water feed inlet of the electric heating steam generator, the steam outlet of the electric heating steam generator is connected to the steam inlet of the steam superheater, and a regulating valve is installed at the steam outlet of the electric heating steam generator.

[0010] Preferably, the industrial steam supply mechanism includes a steam pressure matcher, the high-pressure steam inlet of the steam pressure matcher is connected to the steam outlet of the high-pressure steam cooling heat exchanger, and a regulating valve is installed at the high-pressure steam inlet of the steam pressure matcher, the low-pressure steam inlet of the steam pressure matcher is connected to the steam extraction ports of the medium and low pressure cylinders through an industrial steam extraction pipe, and a regulating valve is installed on the industrial steam extraction pipe, the medium-pressure steam outlet of the steam pressure matcher is connected to the industrial steam supply main pipe, and a regulating valve is installed at the medium-pressure steam outlet of the steam pressure matcher.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects: (1) by rationally designing the multi-stage heat exchange molten salt heat storage mechanism and the molten salt heat release mechanism, the step-by-step efficient utilization of energy of different grades is achieved, thereby increasing the operating energy efficiency of the system peak load regulation; (2) by designing a molten salt heat release start-up mechanism including an electric heating steam generator, the key problem that the low-temperature section of the molten salt heat exchange (i.e., the steam generator) cannot generate steam to meet the cold source steam demand of the high-temperature section of the molten salt heat exchange (i.e., the steam superheater) when the system heat release peak load regulation is started is solved, thereby improving the reliability and safety of the system peak load regulation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a steam heat utilization system for improving the peak-shaving reliability of a heat storage-assisted thermal power unit in an embodiment of the utility model.

[0013] In the figure: 1-power station boiler, 2-high pressure cylinder, 3-medium and low pressure cylinder, 4-generator, 5-condenser, 6-low pressure regenerator, 7-deaerator, 8-boiler feed water pump, 9-high pressure regenerator, 10-low temperature molten salt storage tank, 11-high temperature molten salt storage tank, 12-low temperature molten salt pump, 13-steam condensing heat exchanger, 14-high pressure steam cooling heat exchanger, 15-molten salt electric heater, 16-high temperature molten salt pump, 17-steam superheater, 18-steam generator, 19-exothermic feed water pump, 20-electrically heated steam generator, 21-steam pressure Matching device, 22-valve No. 1, 23-valve No. 2, 24-valve No. 3, 25-valve No. 4, 26-valve No. 5, 27-valve No. 6, 28-valve No. 7, 29-valve No. 8, 30-valve No. 9, 31-valve No. 10, 32-valve No. 11, 33-valve No. 12, 34-valve No. 13, 35-valve No. 14, 36-valve No. 15, 37-valve No. 16, 38-valve No. 17, 39-valve No. 18, 40-industrial steam extraction pipe, 41-water supply branch pipe, 42-industrial steam supply main pipe. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0015] See also Figure 1 The embodiment of the utility model relates to a steam heat utilization system for improving the peak-shaving reliability of a heat storage-assisted thermal power unit, comprising a power station boiler 1, a steam turbine unit, a low-temperature molten salt storage tank 10, a high-temperature molten salt storage tank 11, a molten salt heat storage mechanism, a molten salt heat release mechanism, a molten salt heat release start mechanism, an industrial steam supply mechanism and an industrial steam supply mother pipe 42. The steam turbine unit comprises a high-pressure cylinder 2, a medium- and low-pressure cylinder 3, a generator 4, a condenser 5, a low-pressure regenerator 6, a deaerator 7, a boiler feed water pump 8 and a high-pressure regenerator 9. The steam inlet of the high-pressure cylinder 2 is connected to the steam outlet of the superheater of the power station boiler 1. The exhaust port of the high-pressure cylinder 2 is connected to the steam inlet of the reheater of the power station boiler 1, and the steam outlet of the reheater of the power station boiler 1 is connected to the steam inlet of the medium-low pressure cylinder 3, and a valve No. 1 22 is installed at the steam inlet of the medium-low pressure cylinder 3, and the exhaust port of the medium-low pressure cylinder 3 is connected to the exhaust steam inlet of the condenser 5. The high-pressure cylinder 2 and the medium-low pressure cylinder 3 are coaxially connected and drive the generator 4 to generate electricity. The feed water side of the condenser 5, the low-pressure regenerator 6, the deaerator 7, the boiler feed water pump 8 and the high-pressure regenerator 9 are connected in sequence along the water flow direction. The feed water inlet of the boiler feed water pump 8 is installed with a valve No. 4 25, and the high-pressure The water supply outlet of the high-pressure regenerator 9 is connected to the water supply inlet of the power station boiler 1, the molten salt outlet of the low-temperature molten salt storage tank 10 is connected to the molten salt inlet of the molten salt heat storage mechanism, the molten salt outlet of the molten salt heat storage mechanism is connected to the molten salt inlet of the high-temperature molten salt storage tank 11, the steam inlet of the molten salt heat storage mechanism is connected to the steam outlet of the reheater of the power station boiler 1, the steam outlet of the molten salt heat storage mechanism is connected to the high-pressure steam inlet of the industrial steam supply mechanism, the drain outlet of the molten salt heat storage mechanism is connected to the water supply inlet of the deaerator 7, the molten salt outlet of the high-temperature molten salt storage tank 11 is connected to the molten salt inlet of the molten salt heat release mechanism The molten salt outlet of the molten salt heat release mechanism is connected to the molten salt inlet of the low-temperature molten salt storage tank 10, the water supply inlets of the molten salt heat release mechanism and the molten salt heat release start mechanism are simultaneously connected to the water supply outlet of the deaerator 7 through the water supply branch pipe 41, the steam outlet of the molten salt heat release start mechanism is connected to the steam inlet of the molten salt heat release mechanism, the steam outlet of the molten salt heat release mechanism is connected to the industrial steam supply mother pipe 42, the low-pressure steam inlet of the industrial steam supply mechanism is connected to the steam extraction port of the medium and low pressure cylinder 3 through the industrial steam extraction pipe 40, and the medium-pressure steam outlet of the industrial steam supply mechanism is connected to the industrial steam supply mother pipe 42;

[0016] In order to realize the system heat storage peak regulation and industrial steam supply, the molten salt heat storage mechanism includes a low-temperature molten salt pump 12, a steam condensing heat exchanger 13, a high-pressure steam cooling heat exchanger 14 and a molten salt electric heater 15. The low-temperature molten salt pump 12 is arranged at the molten salt outlet of the low-temperature molten salt storage tank 10, and the molten salt outlet of the low-temperature molten salt storage tank 10 is also connected to the molten salt inlet of the steam condensing heat exchanger 13, and a No. 9 valve 30 is installed at the molten salt outlet of the low-temperature molten salt storage tank 10. The steam condensing heat exchanger 13, the high-pressure steam cooling heat exchanger 14 and the molten salt side of the molten salt electric heater 15 are connected in series in sequence, and the molten salt outlet of the molten salt electric heater 15 is connected to the molten salt outlet of the high-temperature molten salt storage tank 11. The high-temperature molten salt inlet is connected, and a No. 10 valve 31 is installed at the molten salt inlet of the high-temperature molten salt storage tank 11, the steam inlet of the high-pressure steam cooling heat exchanger 14 is connected to the reheater steam outlet of the power station boiler 1, and a No. 2 valve 23 is installed at the steam inlet of the high-pressure steam cooling heat exchanger 14, the steam outlet of the high-pressure steam cooling heat exchanger 14 is simultaneously connected to the high-pressure steam inlet of the industrial steam supply mechanism and the steam inlet of the steam condensing heat exchanger 13, and a No. 8 valve 29 is installed at the steam inlet of the steam condensing heat exchanger 13, the drain outlet of the steam condensing heat exchanger 13 is connected to the water feed inlet of the deaerator 7, and the drain outlet of the steam condensing heat exchanger 13 is connected to the water feed inlet of the deaerator 7. A No. 6 valve 27 is installed, and the molten salt heat release mechanism includes a high-temperature molten salt pump 16, a steam superheater 17, a steam generator 18 and a heat release feed water pump 19. The high-temperature molten salt pump 16 is arranged at the molten salt outlet of the high-temperature molten salt storage tank 11, and the molten salt outlet of the high-temperature molten salt storage tank 11 is connected to the molten salt inlet of the steam superheater 17, and a No. 11 valve 32 is installed at the molten salt outlet of the high-temperature molten salt storage tank 11, the molten salt outlet of the steam superheater 17 is connected to the molten salt inlet of the steam generator 18, and the molten salt outlet of the steam generator 18 is connected to the molten salt inlet of the low-temperature molten salt storage tank 10, and a No. 12 valve 3 is installed at the molten salt inlet of the low-temperature molten salt storage tank 10 3. The water inlet of the steam generator 18 and the molten salt exothermic starting mechanism are connected to the water outlet of the deaerator 7 through the water branch pipe 41, and a No. 13 valve 34 is installed at the water inlet of the steam generator 18. A heat release water pump 19 and a No. 5 valve 26 are installed on the water branch pipe 41. The steam inlet of the steam superheater 17 is connected to the steam outlet of the steam generator 18 and the molten salt exothermic starting mechanism at the same time, and a No. 15 valve 36 is installed at the steam outlet of the steam generator 18. The steam outlet of the steam superheater 17 is connected to the industrial steam supply main pipe 42, and a No. 17 valve 38 is installed at the steam outlet of the steam superheater 17.

[0017] See also Figure 1Furthermore, in order to improve the safety and reliability of heat storage peak regulation, the molten salt heat release starting mechanism includes an electric heating steam generator 20, the water supply inlet of the electric heating steam generator 20 is connected to the water supply outlet of the deaerator 7 through a water supply branch pipe 41, and a No. 14 valve 35 is installed at the water supply inlet of the electric heating steam generator 20, the steam outlet of the electric heating steam generator 20 is connected to the steam inlet of the steam superheater 17, and a No. 16 valve 37 is installed at the steam outlet of the electric heating steam generator 20.

[0018] See also Figure 1 Furthermore, in order to improve the flexibility of industrial steam supply, the industrial steam supply mechanism includes a steam pressure matcher 21, the high-pressure steam inlet of the steam pressure matcher 21 is connected to the steam outlet of the high-pressure steam cooling heat exchanger 14, and a No. 7 valve 28 is installed at the high-pressure steam inlet of the steam pressure matcher 21, the low-pressure steam inlet of the steam pressure matcher 21 is connected to the extraction port of the medium and low pressure cylinder 3 through the industrial extraction pipe 40, and a No. 3 valve 24 is installed on the industrial extraction pipe 40, the medium-pressure steam outlet of the steam pressure matcher 21 is connected to the industrial steam supply main pipe 42, and a No. 18 valve 39 is installed at the medium-pressure steam outlet of the steam pressure matcher 21.

[0019] The system safe and reliable peak load regulation method involved in this embodiment is as follows:

[0020] When the system reduces the load for peak load regulation, by opening and adjusting the corresponding valves, the hot re-steam output by the power station boiler 1 is used to heat the low-temperature molten salt for heat storage through the high-pressure steam cooling heat exchanger 14 and the steam condensing heat exchanger 13 in sequence, thereby reducing the amount of hot re-steam entering the steam turbine unit to do work, and further reducing the on-grid power load of the steam turbine unit. When the peak load regulation capacity of the unit is insufficient to be increased by heating the molten salt for heat storage by the hot re-steam, the electric load output by the generator 4 is used again to further heat the molten salt for heat storage by the molten salt electric heater 15, which not only improves the peak load regulation capacity of the steam turbine unit, but also realizes the cascade heat exchange of the molten salt heat storage process, and increases the operating energy efficiency.

[0021] When the system increases the load for peak regulation, in the process of just starting the molten salt heat release mechanism, the electrically heated steam generator 20 is first used to produce saturated steam, which is used as the cold source steam of the steam superheater 17 to perform the first cooling of the high-temperature molten salt output from the high-temperature molten salt storage tank 11, and then transported to the steam generator 18. At this time, the amount of saturated steam produced by the electrically heated steam generator 20 is gradually reduced, and the reduced amount of saturated steam is produced and supplemented by the steam generator 18 using the second cooling of the high-temperature molten salt until the electrically heated steam generator 20 stops running. At this time, the molten salt heat release mechanism is in stable operation and the molten salt heat release starting mechanism stops running.

[0022] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A steam heat utilization system for improving the peak-shaving reliability of a heat storage-assisted thermal power unit, comprising a power station boiler and a steam turbine unit, wherein the steam turbine unit comprises a high-pressure cylinder, a medium- and low-pressure cylinder, a generator, a condenser, a low-pressure regenerator, a deaerator, a boiler feed water pump and a high-pressure regenerator, wherein the steam inlet of the high-pressure cylinder is connected to the steam outlet of the superheater of the power station boiler, the steam outlet of the high-pressure cylinder is connected to the steam inlet of the reheater of the power station boiler, the steam outlet of the reheater of the power station boiler is connected to the steam inlet of the medium- and low-pressure cylinders, and a regulating valve is installed at the steam inlet of the medium- and low-pressure cylinders, the steam outlet of the medium- and low-pressure cylinders is connected to the exhaust steam inlet of the condenser, the high-pressure cylinder is coaxially connected with the medium- and low-pressure cylinders, the water supply sides of the condenser, the low-pressure regenerator, the deaerator, the boiler feed water pump and the high-pressure regenerator are sequentially connected along the water flow direction, the water supply inlet of the boiler feed water pump is installed with a regulating valve, and the water supply outlet of the high-pressure regenerator is connected to the water supply inlet of the power station boiler; It is characterized in that Also includes: A low-temperature molten salt storage tank, a high-temperature molten salt storage tank, a molten salt heat storage mechanism, a molten salt heat release mechanism, a molten salt heat release start-up mechanism, an industrial steam supply mechanism and an industrial steam supply main pipe, the molten salt outlet of the low-temperature molten salt storage tank is connected to the molten salt inlet of the molten salt heat storage mechanism, the molten salt outlet of the molten salt heat storage mechanism is connected to the molten salt inlet of the high-temperature molten salt storage tank, the steam inlet of the molten salt heat storage mechanism is connected to the steam outlet of the reheater of the power station boiler, the steam outlet of the molten salt heat storage mechanism is connected to the high-pressure steam inlet of the industrial steam supply mechanism, the drain outlet of the molten salt heat storage mechanism is connected to the water feed inlet of the deaerator, the molten salt outlet of the high-temperature molten salt storage tank ... The salt outlet is connected to the molten salt inlet of the molten salt heat release mechanism, the molten salt outlet of the molten salt heat release mechanism is connected to the molten salt inlet of the low-temperature molten salt storage tank, the water inlets of the molten salt heat release mechanism and the molten salt heat release starting mechanism are simultaneously connected to the water supply outlet of the deaerator through a water supply branch pipe, the steam outlet of the molten salt heat release starting mechanism is connected to the steam inlet of the molten salt heat release mechanism, the steam outlet of the molten salt heat release mechanism is connected to the industrial steam supply main pipe, the low-pressure steam inlet of the industrial steam supply mechanism is connected to the steam extraction port of the medium and low pressure cylinder through the industrial steam extraction pipe, and the medium-pressure steam outlet of the industrial steam supply mechanism is connected to the industrial steam supply main pipe.

2. A steam heat utilization system for improving the peak load reliability of thermal power generation units assisted by thermal storage according to claim 1, characterized in that: The molten salt heat storage mechanism comprises a low-temperature molten salt pump, a steam condensing heat exchanger, a high-pressure steam cooling heat exchanger and a molten salt electric heater. The low-temperature molten salt pump is arranged at the molten salt outlet of the low-temperature molten salt storage tank. The molten salt outlet of the low-temperature molten salt storage tank is also connected to the molten salt inlet of the steam condensing heat exchanger, and a regulating valve is installed at the molten salt outlet of the low-temperature molten salt storage tank. The molten salt sides of the steam condensing heat exchanger, the high-pressure steam cooling heat exchanger and the molten salt electric heater are sequentially connected in series. The molten salt outlet of the molten salt electric heater is connected to the molten salt inlet of the high-temperature molten salt storage tank, and the high-pressure steam cooling heat exchanger is connected to the high-temperature molten salt storage tank. A regulating valve is installed at the molten salt inlet of the tank, the steam inlet of the high-pressure steam cooling heat exchanger is connected to the steam outlet of the reheater of the power station boiler, and a regulating valve is installed at the steam inlet of the high-pressure steam cooling heat exchanger, the steam outlet of the high-pressure steam cooling heat exchanger is simultaneously connected to the high-pressure steam inlet of the industrial steam supply mechanism and the steam inlet of the steam condensing heat exchanger, and a regulating valve is installed at the steam inlet of the steam condensing heat exchanger, the drain outlet of the steam condensing heat exchanger is connected to the water feed inlet of the deaerator, and a regulating valve is installed at the drain outlet of the steam condensing heat exchanger.

3. A steam heat utilization system for improving the peak load reliability of a thermal power unit assisted by heat storage according to claim 1 or 2, characterized in that: The molten salt heat release mechanism comprises a high-temperature molten salt pump, a steam superheater, a steam generator and a heat release feed water pump. The high-temperature molten salt pump is arranged at the molten salt outlet of the high-temperature molten salt storage tank, the molten salt outlet of the high-temperature molten salt storage tank is connected to the molten salt inlet of the steam superheater, and a regulating valve is installed at the molten salt outlet of the high-temperature molten salt storage tank, the molten salt outlet of the steam superheater is connected to the molten salt inlet of the steam generator, the molten salt outlet of the steam generator is connected to the molten salt inlet of the low-temperature molten salt storage tank, and a regulating valve is installed at the molten salt inlet of the low-temperature molten salt storage tank. The water supply inlet of the steam generator and the molten salt exothermic starting mechanism are connected to the water supply outlet of the deaerator through a water supply branch pipe, and a regulating valve is installed at the water supply inlet of the steam generator. A heat release water supply pump and a regulating valve are installed on the water supply branch pipe. The steam inlet of the steam superheater is connected to the steam outlet of the steam generator and the molten salt exothermic starting mechanism, and a regulating valve is installed at the steam outlet of the steam generator. The steam outlet of the steam superheater is connected to the industrial steam supply main pipe, and a regulating valve is installed at the steam outlet of the steam superheater.

4. A steam heat utilization system for improving the peak load reliability of a thermal power unit assisted by thermal storage according to claim 3, characterized in that: The molten salt exothermic starting mechanism includes an electric heating steam generator, the water feed inlet of the electric heating steam generator is connected to the water feed outlet of the deaerator through a water feed branch pipe, and a regulating valve is installed at the water feed inlet of the electric heating steam generator, the steam outlet of the electric heating steam generator is connected to the steam inlet of the steam superheater, and a regulating valve is installed at the steam outlet of the electric heating steam generator.

5. A steam heat utilization system for improving the peak load reliability of a thermal power unit assisted by thermal storage according to claim 2 or 4, characterized in that: The industrial steam supply mechanism includes a steam pressure matcher, a high-pressure steam inlet of the steam pressure matcher is connected to the steam outlet of the high-pressure steam cooling heat exchanger, and a regulating valve is installed at the high-pressure steam inlet of the steam pressure matcher, a low-pressure steam inlet of the steam pressure matcher is connected to the steam extraction ports of the medium and low pressure cylinders through an industrial steam extraction pipe, and a regulating valve is installed on the industrial steam extraction pipe, and a medium-pressure steam outlet of the steam pressure matcher is connected to the industrial steam supply main pipe, and a regulating valve is installed at the medium-pressure steam outlet of the steam pressure matcher.

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