Thermal power plant fused salt energy storage stable steam supply system

Abstract

The embodiment of the utility model provides a thermal power plant fused salt energy storage stable steam supply system. The system comprises a first power supply unit, a second power supply unit and a fused salt energy storage steam supply module. The first power supply unit and the second power supply unit are respectively connected with the fused salt energy storage and steam supply module through a station service bus and are used for supplying power to the fused salt energy storage and steam supply module; the first power supply unit, the second power supply unit and the station service bus are respectively connected with a power grid bus; and the fused salt energy storage steam supply module is used for supplying steam to users. According to the thermal power plant fused salt energy storage stable steam supply system, by flexibly selecting the operation modes of multiple units, it is guaranteed that the thermal power plant fused salt energy storage steam supply system can stably supply steam to users under various working conditions of starting and stopping of the units, the stability of the thermal power plant steam supply system is improved, social benefits are guaranteed, and the economic benefits are increased. And possible safety accidents are avoided.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure belongs to the technical field of molten salt energy storage steam supply for thermal power plants, and particularly relates to a molten salt energy storage stable steam supply system for thermal power plants. BACKGROUND

[0002] With the development of industry, more and more enterprises need to be guaranteed by thermal power plants for steam supply, and have higher requirements for the quality and uninterruptedness of steam supply. When the molten salt energy storage steam supply system of the thermal power plant fails and is powered off, steam supply will be interrupted, the enterprise cannot be stably supplied with steam, and may face huge default penalties, loss of social benefits, even cause safety accidents and the like. SUMMARY

[0003] The embodiment of the present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a molten salt energy storage stable steam supply system for thermal power plants. The system comprises a first power supply unit, a second power supply unit and a molten salt energy storage steam supply module;

[0004] The first power supply unit and the second power supply unit are connected with the molten salt energy storage steam supply module through a plant bus respectively, and are used for supplying power to the molten salt energy storage steam supply module;

[0005] The first power supply unit, the second power supply unit and the plant bus are also connected with a grid bus respectively;

[0006] The molten salt energy storage steam supply module is used for supplying steam to a user.

[0007] Further, the first power supply unit is connected with a first grid bus through a first main transformer;

[0008] The first power supply unit is connected with the first plant bus through a first plant transformer and a first plant bus incoming line circuit breaker in sequence;

[0009] The first plant bus is connected with the molten salt energy storage steam supply module through a first molten salt circuit breaker, and is used for supplying power to the molten salt energy storage steam supply module.

[0010] Further, the first grid bus is connected with the first plant bus through an enabling backup transformer and an enabling backup circuit breaker in sequence.

[0011] Further, the second power supply unit is connected with a second grid bus through a second main transformer;

[0012] The second power supply unit is connected with a second plant bus through a second plant transformer and a second plant bus incoming line circuit breaker in sequence;

[0013] The second plant bus is connected with the molten salt energy storage steam supply module through a second molten salt circuit breaker, and is used for supplying power to the molten salt energy storage steam supply module.

[0014] Further, the molten salt energy storage steam supply module comprises a first molten salt electric heater, a second molten salt electric heater, a high-temperature molten salt tank, a high-temperature molten salt pump, a heat exchanger, a low-temperature molten salt tank, and a low-temperature molten salt pump.

[0015] The high-temperature molten salt tank, the high-temperature molten salt pump, the heat exchanger, the low-temperature molten salt tank, and the low-temperature molten salt pump are sequentially connected; wherein the heat exchanger is provided with a steam supply outlet for supplying steam to a user.

[0016] Output ends of the first molten salt electric heater and the second molten salt electric heater are connected to input ends of the high-temperature molten salt tank, respectively.

[0017] Output ends of the low-temperature molten salt pump are connected to input ends of the first molten salt electric heater and the second molten salt electric heater, respectively.

[0018] The first plant bus is connected to the first molten salt electric heater through a first molten salt circuit breaker for supplying power to the first molten salt electric heater; and the second plant bus is connected to the second molten salt electric heater through a second molten salt circuit breaker for supplying power to the second molten salt electric heater.

[0019] Further, a high-temperature molten salt valve is arranged between the high-temperature molten salt pump and the heat exchanger.

[0020] Further, first and second low-temperature molten salt valves are arranged between the low-temperature molten salt pump and the first and second molten salt electric heaters, respectively.

[0021] Further, the molten salt energy storage steam supply module further comprises a deoxygenated water device.

[0022] The deoxygenated water device is connected to the steam supply outlet through the heat exchanger.

[0023] The power plant molten salt energy storage stable steam supply system of the embodiment of the present disclosure can ensure that the power plant molten salt energy storage steam supply system can stably supply steam to users under various operating conditions of starting and stopping of each unit by flexibly selecting the operating mode of multiple units, improve the stability of the power plant steam supply system, ensure social benefits, and avoid possible safety accidents. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a power plant molten salt energy storage stable steam supply system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0026] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0027] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0028] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this disclosure. As used in this disclosure, the term "and / or" includes all combinations of any and more of the associated listed items.

[0029] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing this disclosure, and therefore cannot be used to limit the scope of protection of this disclosure.

[0030] like Figure 1 As shown in the figure, embodiments of this disclosure provide a molten salt energy storage stable steam supply system for a thermal power plant. The system includes a first power supply unit 1-1, a second power supply unit 2-1, and a molten salt energy storage steam supply module 3. The first power supply unit 1-1 and the second power supply unit 2-1 are respectively connected to the molten salt energy storage steam supply module 3 via a 6kV plant service bus, for supplying power to the molten salt energy storage steam supply module 3. The first power supply unit 1-1, the second power supply unit 2-1, and the 6kV plant service bus are also respectively connected to a 220kV power grid bus. The molten salt energy storage steam supply module 3 is used to supply steam to users.

[0031] Specifically, when the first power supply unit 1-1 and the second power supply unit 2-1 are in normal operation, the molten salt energy storage steam supply module 3 is supplied with power respectively. When any one of the first power supply unit 1-1 and the second power supply unit 2-1 is out of service due to failure or maintenance, the molten salt energy storage steam supply module 3 is supplied with power by the one of the two units that is still in operation. When both the first power supply unit 1-1 and the second power supply unit 2-1 are out of service, the molten salt energy storage steam supply module 3 is supplied with power by the unified regulating power transformer that connects the 220kV power grid bus to the 6kV plant bus.

[0032] As shown in Figure 1 , the first power supply unit 1-1 is connected to the first power grid bus 1-3 through the first main transformer 1-2. The first power supply unit 1-1 is connected to the first plant bus 1-6 through the first plant transformer 1-4 and the first plant bus incoming line circuit breaker 1-5 in sequence. The first plant bus 1-6 is connected to the molten salt energy storage steam supply module 3 through the first molten salt circuit breaker 1-9, for supplying the molten salt energy storage steam supply module 3 with power.

[0033] Specifically, the power generated by the first power supply unit 1-1 is transmitted to the first 220kV power grid bus 1-3 for power grid on-grid, and is transmitted to the first 6kV plant bus 1-6 for supplying the molten salt energy storage steam supply module 3 with power. When the first power supply unit 1-1 is out of service, the high-voltage molten salt circuit breaker 1-9 is disconnected, so that the supply of power to the molten salt energy storage steam supply module 3 is stopped, and the molten salt energy storage steam supply module 3 is supplied with power by the second power supply unit 2-1.

[0034] As shown in Figure 1 , the first power grid bus 1-3 is connected to the first plant bus 1-6 through the standby transformer 1-7 and the standby circuit breaker 1-8 in sequence.

[0035] Specifically, when both the first power supply unit 1-1 and the second power supply unit 2-1 are out of service, the standby circuit breaker 1-8 and the first molten salt circuit breaker 1-9 can be closed, and the power is transmitted from the first 220kV power grid bus 1-3 to the first 6kV plant bus 1-6 through the standby transformer 1-7, so as to supply the molten salt energy storage steam supply module 3 with power.

[0036] As shown in Figure 1 , the second power supply unit 2-1 is connected to the second power grid bus 2-3 through the second main transformer 2-2. The second power supply unit 2-1 is connected to the second plant bus 2-6 through the second plant transformer 2-4 and the second plant bus incoming line circuit breaker 2-5 in sequence. The second plant bus 2-6 is connected to the molten salt energy storage steam supply module 3 through the second molten salt circuit breaker 2-7, for supplying the molten salt energy storage steam supply module 3 with power.

[0037] Specifically, the electric energy generated by the second power supply unit 2-1 is connected to the second 220kV power grid bus 2-3 for power supply, and the other part is connected to the second 6kV plant bus 2-6, and the second 6kV plant bus 2-6 supplies power to the molten salt energy storage steam supply module 3. When the second power supply unit 2-1 is shut down, the high-voltage molten salt circuit breaker 2-7 is disconnected to stop supplying power to the molten salt energy storage steam supply module 3, and only the first power supply unit 1-1 supplies power to the molten salt energy storage steam supply module 3.

[0038] As shown in Figure 1 , the molten salt energy storage steam supply module 3 includes a first molten salt electric heater 3-1, a second molten salt electric heater 3-2, a high-temperature molten salt tank 3-3, a high-temperature molten salt pump 3-4, a heat exchanger 3-6, a low-temperature molten salt tank 3-7, and a low-temperature molten salt pump 3-7. The high-temperature molten salt tank 3-3, the high-temperature molten salt pump 3-4, the heat exchanger 3-6, the low-temperature molten salt tank 3-7, and the low-temperature molten salt pump 3-8 are connected in sequence; wherein the heat exchanger 3-6 is provided with a steam outlet 3-12 for supplying steam to the user. The output ends of the first molten salt electric heater 3-1 and the second molten salt electric heater 3-2 are respectively connected to the input ends of the high-temperature molten salt tank 3-3. The output end of the low-temperature molten salt pump 3-8 is respectively connected to the input ends of the first molten salt electric heater 3-1 and the second molten salt electric heater 3-1. The first plant bus 1-6 is connected to the first molten salt electric heater 3-1 through the first molten salt circuit breaker 1-9, for supplying power to the first molten salt electric heater 3-1; the second plant bus 2-6 is connected to the second molten salt electric heater 3-2 through the second molten salt circuit breaker 2-7, for supplying power to the second molten salt electric heater 3-2.

[0039] As shown in Figure 1 , a high-temperature molten salt valve 3-5 is arranged between the high-temperature molten salt pump 3-4 and the heat exchanger 3-6 to control the on-off of the high-temperature molten salt pump 3-4 and the heat exchanger 3-6.

[0040] As shown in Figure 1 , the low-temperature molten salt pump 3-8 and the first molten salt electric heater 3-1 and the second molten salt electric heater 3-2 are respectively provided with a first low-temperature molten salt valve 3-9 and a second low-temperature molten salt valve 3-10 to control the on-off of the low-temperature molten salt pump 3-8 and the first molten salt electric heater 3-1, and the low-temperature molten salt pump 3-8 and the second molten salt electric heater 3-2.

[0041] As shown in Figure 1 , the molten salt energy storage steam supply module 3 further includes an oxygen-free water device 3-11. The oxygen-free water device 3-11 is connected to the steam outlet 3-12 through the heat exchanger 3-6 to provide oxygen-free water for the steam outlet 3-12.

[0042] The power plant molten salt energy storage stable steam supply system of the embodiment of the present disclosure can ensure that the power plant molten salt energy storage steam supply system can stably supply steam to users under various operating conditions of starting and stopping of each unit by flexibly selecting the operating mode of multiple units, improve the stability of the power plant steam supply system, ensure social benefits, and avoid possible safety accidents.

[0043] It can be understood that the above implementation manners are only exemplary implementation manners adopted for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the present disclosure.

Claims

1. A molten salt energy storage and stable steam supply system for thermal power plants, characterized in that, The system comprises a first power supply unit, a second power supply unit and a molten salt energy storage steam supply module; The first power supply unit and the second power supply unit are respectively connected with the molten salt energy storage steam supply module through a plant bus, for supplying power to the molten salt energy storage steam supply module; The first power supply unit, the second power supply unit and the plant bus are also respectively connected with a grid bus; The molten salt energy storage steam supply module is used for supplying steam to users.

2. The system of claim 1, wherein, The first power supply unit is connected with a first grid bus through a first main transformer; The first power supply unit is connected with a first plant bus through a first plant transformer and a first plant bus incoming line breaker in sequence; The first plant bus is connected with the molten salt energy storage steam supply module through a first molten salt breaker, for supplying power to the molten salt energy storage steam supply module.

3. The system of claim 2, wherein, The first grid bus is connected with the first plant bus through a standby transformer and a standby breaker in sequence.

4. The system of claim 3, wherein, The second power supply unit is connected with a second grid bus through a second main transformer; The second power supply unit is connected with a second plant bus through a second plant transformer and a second plant bus incoming line breaker in sequence; The second plant bus is connected with the molten salt energy storage steam supply module through a second molten salt breaker, for supplying power to the molten salt energy storage steam supply module.

5. The system of claim 4, wherein, The molten salt energy storage steam supply module comprises a first molten salt electric heater, a second molten salt electric heater, a high-temperature molten salt tank, a high-temperature molten salt pump, a heat exchanger, a low-temperature molten salt tank and a low-temperature molten salt pump; The high-temperature molten salt tank, the high-temperature molten salt pump, the heat exchanger, the low-temperature molten salt tank and the low-temperature molten salt pump are connected in sequence; wherein the heat exchanger is provided with a steam supply outlet for supplying steam to users; Output ends of the first molten salt electric heater and the second molten salt electric heater are respectively connected with input ends of the high-temperature molten salt tank; Output ends of the low-temperature molten salt pump are respectively connected with input ends of the first molten salt electric heater and the second molten salt electric heater; The first plant bus is connected with the first molten salt electric heater through a first molten salt breaker, for supplying power to the first molten salt electric heater; and the second plant bus is connected with the second molten salt electric heater through a second molten salt breaker, for supplying power to the second molten salt electric heater.

6. The system of claim 5, wherein, A high-temperature molten salt valve is arranged between the high-temperature molten salt pump and the heat exchanger.

7. The system of claim 5, wherein, First and second low-temperature molten salt valves are respectively arranged between the low-temperature molten salt pump and the first and second molten salt electric heaters.

8. The system of any one of claims 5 to 7, wherein, The molten salt energy storage steam supply module further comprises a deoxygenated water device; The deoxygenated water device is connected with the steam supply outlet through the heat exchanger.

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