Electric power system based on fused salt energy storage power generation

Abstract

The utility model provides an electric power system based on fused salt energy storage power generation, which comprises a hot fused salt tank, a hot fused salt pump is arranged on one side of an outlet of the hot fused salt tank, a superheater and a reheater are arranged on one side of the hot fused salt pump, a preheating evaporator is arranged on one side of the superheater and one side of the reheater, and the preheating evaporator is arranged on one side of the hot fused salt tank. One side of the preheating evaporator is connected to a cold molten salt tank, a first heating pipeline and a second heating pipeline are arranged at an outlet of the cold molten salt tank, a first cold molten salt pump is arranged on the first heating pipeline, a first heating electric appliance is arranged on one side of the first cold molten salt pump, and a second heating electric appliance is arranged on the other side of the second cold molten salt pump. The second heating pipeline is provided with a second cold molten salt pump, and one side of the second cold molten salt pump is provided with a second electric heater. According to the scheme, the arrangement is flexible, the energy storage power generation capacity is determined according to the installed capacity of new energy, and wind energy is better consumed.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, specifically a power system based on molten salt energy storage for power generation. Background Technology

[0002] Wind and solar energy are abundant renewable energy sources, but they cannot provide a continuous and constant energy supply. Therefore, the proportion of wind and solar power generation capacity in the grid capacity cannot exceed a certain limit, otherwise it will affect grid security. Under the guidance of the national policies of "carbon neutrality" and "carbon peaking," more and more new energy power plants such as wind farms and solar power plants are being built in my country, with increasingly larger capacities. Due to grid stability limitations, "wind curtailment" and "solar curtailment" are common, resulting in huge waste. To ensure the large-scale and stable grid connection of wind and solar power, the problem of large-scale energy storage must be solved. At present, large-scale energy storage technology is far from mature, and there are even fewer energy storage systems that can be applied to wind and solar power generation. Although flywheel energy storage, chemical battery energy storage, supercapacitor energy storage, and superconducting energy storage have high power density and fast response speed, and can provide instantaneous power support for the grid to absorb wind power, their energy storage capacity is very small and can only be used to improve power quality and system stability. Pumped hydro storage and compressed air storage have the advantages of large energy storage capacity and long storage time, but their response speed is relatively slow. They are mainly used in energy management and power peak shaving applications. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a power system based on molten salt energy storage for power generation, so as to solve the problems mentioned in the background art.

[0004] The technical problem solved by this utility model is achieved by the following technical solution: a power system based on molten salt energy storage power generation, including a hot molten salt tank, a hot molten salt pump is provided on one side of the outlet of the hot molten salt tank, a superheater and a reheater are provided on one side of the hot molten salt pump, a preheating evaporator is provided on one side of the superheater and the reheater, and one side of the preheating evaporator is connected to a cold molten salt tank.

[0005] Furthermore, the outlet of the cold molten salt tank is provided with a first heating pipe and a second heating pipe. A first cold molten salt pump is provided on the first heating pipe, and a first heating appliance is provided on one side of the first cold molten salt pump. A second cold molten salt pump is provided on the second heating pipe, and a second electric heater is provided on one side of the second cold molten salt pump.

[0006] Furthermore, one side of the first heating appliance and the second electric heater is connected to the molten salt tank.

[0007] Furthermore, a temperature-regulating molten salt pipeline is provided at the outlet of the cold molten salt tank, and a temperature-regulating pump is installed on the temperature-regulating molten salt pipeline, which is connected to the outlet pipeline of the hot molten salt pump.

[0008] Furthermore, the superheater and reheater are connected in parallel.

[0009] Furthermore, the outlet of the reheater is connected to the intermediate-pressure cylinder, one side of the intermediate-pressure cylinder is connected to the low-pressure cylinder, and a generator is installed on one side of the low-pressure cylinder.

[0010] Furthermore, a condenser is provided at the lower end of the low-pressure cylinder, a condensate pump is provided on one side of the condenser, a first low-pressure heater is provided on one side of the condensate pump, a second low-pressure heater is provided on one side of the first low-pressure heater, a deaerator is provided on one side of the second low-pressure heater, a feedwater pump is provided at the outlet of the deaerator, a first high-pressure heater is provided on one side of the feedwater pump, and a second high-pressure heater is provided on one side of the first high-pressure heater.

[0011] Furthermore, the cold molten salt tank has a built-in electric heater.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) The layout of this utility model is flexible. The energy storage and power generation capacity is determined according to the installed capacity of new energy, which can better absorb wind energy.

[0014] (2) Completely change the unreasonable phenomena such as “curtailment of wind power” and “curtailment of solar power”. This plan will convert all the scattered and unstable wind power, solar power and other new energy power generation into the thermal energy of high temperature lava and store it. At any time, the thermal energy can be continuously and stably released to exchange heat with water to generate superheated steam, and high-quality power will be generated through steam turbine generator sets.

[0015] (3) Applicable to the energy storage transformation of existing wind farms and photovoltaic power plants and other new energy power plants, so as to improve the utilization efficiency of new energy power plants.

[0016] (4) After the large-scale promotion of this technology, it can promote the early arrival of "carbon neutrality" and "carbon peak", making a huge contribution to the cause of environmental protection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram: 1-Hot molten salt tank; 2-Hot molten salt pump; 3-Superheater; 4-Preheating evaporator; 5-Reheater; 6-Cold molten salt tank; 7-Temperature regulating pump; 8-First cold molten salt pump; 9-First electric heater; 10-Second cold molten salt pump; 11-Second electric heater; 12-Medium pressure cylinder; 13-Low pressure cylinder; 14-Generator; 15-Condenser; 16-Condensate pump; 17-First low pressure heater; 18-Second low pressure heater; 19-Deaerator; 20-Feed water pump; 21-First high pressure heater; 22-Second high pressure heater. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can be internal connections between two components.

[0020] Example 1

[0021] like Figure 1 As shown, a power system based on molten salt energy storage for power generation includes a hot molten salt tank 1. A hot molten salt pump 2 is provided on one side of the outlet of the hot molten salt tank 1. A superheater 3 and a reheater 5 are provided on one side of the hot molten salt pump 2. A preheating evaporator 4 is provided on one side of the superheater 3 and the reheater 5. One side of the preheating evaporator 4 is connected to a cold molten salt tank 6.

[0022] Furthermore, the outlet of the cold molten salt tank 6 is provided with a first heating pipe and a second heating pipe. A first cold molten salt pump 8 is provided on the first heating pipe, and a first heating appliance 9 is provided on one side of the first cold molten salt pump 8. A second cold molten salt pump 10 is provided on the second heating pipe, and a second electric heater 11 is provided on one side of the second cold molten salt pump 10.

[0023] Furthermore, one side of the first heating appliance 9 and the second electric heater 11 is connected to the hot molten salt tank 1, and the first heating appliance 9 and the second electric heater 11 are heated by basic electrical energy from an isolated power grid.

[0024] Furthermore, a temperature-regulating molten salt pipeline is provided at the outlet of the cold molten salt tank 6, and a temperature-regulating pump 7 is provided on the temperature-regulating molten salt pipeline. The temperature-regulating pump 7 is connected to the outlet pipeline of the hot molten salt pump 2. Its function is to precisely adjust the temperature of the lava entering the inlet of the molten salt heat exchanger so that the heat exchanger efficiency reaches the optimal level.

[0025] Furthermore, the superheater 3 and the reheater 5 are connected in parallel.

[0026] Furthermore, the outlet of the reheater 5 is connected to the intermediate pressure cylinder 12, one side of the intermediate pressure cylinder 12 is connected to the low pressure cylinder 13, and a generator 14 is provided on one side of the low pressure cylinder 13.

[0027] Furthermore, a condenser 15 is provided at the lower end of the low-pressure cylinder 13, a condensate pump 16 is provided on one side of the condensate pump 15, a first low-pressure heater 17 is provided on one side of the condensate pump 16, a second low-pressure heater 18 is provided on one side of the first low-pressure heater 17, a deaerator 19 is provided on one side of the second low-pressure heater 18, a feed water pump 20 is provided at the outlet of the deaerator 19, a first high-pressure heater 21 is provided on one side of the feed water pump 20, and a second high-pressure heater 22 is provided on one side of the first high-pressure heater 21.

[0028] Furthermore, the cold molten salt tank 6 has a built-in electric heater for absorbing fluctuating electrical energy in isolated power grids.

[0029] The working principle of this invention is as follows: The molten salt from the outlet of the molten salt tank 1 is pressurized by the molten salt pump 2 and then passes sequentially through the superheater 3 and the preheating evaporator 4 before entering the cold molten salt tank 6. The cold molten salt tank 6 contains a built-in electric heater to absorb fluctuating electrical energy from the isolated power grid. The molten salt heating pipe at the outlet of the cold molten salt tank 6 is divided into two paths. After being pressurized by the first cold molten salt pump 8 and the second cold molten salt pump 10, the molten salt passes through the first electric heater 9 and the second electric heater 11 respectively before entering the molten salt tank 1. These two electric heaters utilize the basic electrical energy provided by the isolated power grid. The pump flow rate is matched to the real-time basic electrical energy supplied by the isolated power grid, ensuring that the molten salt at the heater outlet is slightly higher than the temperature required by the molten salt heat exchange system. The cold molten salt tank 6 is also equipped with a temperature-regulating molten salt pipeline, which, after being pressurized by the temperature-regulating pump 7, is connected to the outlet pipeline of the hot molten salt pump 2. Its function is to precisely adjust the temperature of the lava entering the inlet of the molten salt-water heat exchanger, so that the heat exchanger efficiency reaches the optimal level. The condensate from the condenser 15 is pressurized by the condensate pump 16 and then passes through the first low-pressure heater 17 and the second low-pressure heater 18 before entering the deaerator 19. The low-pressure feedwater from the outlet of the deaerator 19 is pressurized by the feedwater pump 20 and then passes through the first high-pressure heater 21, the second high-pressure heater 22, the preheating evaporator 4, and the superheater 3 before being heated into superheated steam and entering the high-pressure cylinder 12 of the turbine to do work. The exhaust steam from the high-pressure cylinder 12 enters the reheater 5 for heating and then enters the intermediate-pressure cylinder to do work. The exhaust steam from the intermediate-pressure cylinder enters the low-pressure cylinder through the connecting pipe to do work. The exhaust steam from the low-pressure cylinder is cooled into condensate and then enters the condenser 15. In this scheme, the high-pressure cylinder and the low-pressure cylinder are arranged coaxially and jointly drive the generator 14 to generate electricity. The electricity is then boosted and connected to the nearby national power grid.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A power system based on molten salt energy storage for power generation, comprising a hot molten salt tank (1), characterized in that: A hot molten salt pump (2) is provided on the outlet side of the hot molten salt tank (1). A superheater (3) and a reheater (5) are provided on one side of the hot molten salt pump (2). A preheating evaporator (4) is provided on one side of the superheater (3) and the reheater (5). One side of the preheating evaporator (4) is connected to the cold molten salt tank (6).

2. The power system based on molten salt energy storage for power generation as described in claim 1, characterized in that: The outlet of the cold molten salt tank (6) is provided with a first heating pipe and a second heating pipe. A first cold molten salt pump (8) is provided on the first heating pipe. A first heating appliance (9) is provided on one side of the first cold molten salt pump (8). A second cold molten salt pump (10) is provided on the second heating pipe. A second electric heater (11) is provided on one side of the second cold molten salt pump (10).

3. A power system based on molten salt energy storage for power generation as described in claim 2, characterized in that: The first heating appliance (9) and the second electric heater (11) are connected on one side to the hot molten salt tank (1).

4. A power system based on molten salt energy storage for power generation as described in claim 1, characterized in that: The outlet of the cold molten salt tank (6) is also equipped with a temperature-regulating molten salt pipeline, and a temperature-regulating pump (7) is installed on the temperature-regulating molten salt pipeline. The temperature-regulating pump (7) is connected to the outlet pipeline of the hot molten salt pump (2).

5. A power system based on molten salt energy storage for power generation as described in claim 1, characterized in that: The superheater (3) and reheater (5) are connected in parallel.

6. A power system based on molten salt energy storage for power generation as described in claim 1, characterized in that: The outlet of the reheater (5) is connected to the intermediate pressure cylinder (12), one side of the intermediate pressure cylinder (12) is connected to the low pressure cylinder (13), and a generator (14) is provided on one side of the low pressure cylinder (13).

7. A power system based on molten salt energy storage for power generation as described in claim 6, characterized in that: A condenser (15) is provided at the lower end of the low-pressure cylinder (13). A condensate pump (16) is provided on one side of the condenser (15). A first low-pressure heater (17) is provided on one side of the condensate pump (16). A second low-pressure heater (18) is provided on one side of the first low-pressure heater (17). A deaerator (19) is provided on one side of the second low-pressure heater (18). A feed water pump (20) is provided at the outlet of the deaerator (19). A first high-pressure heater (21) is provided on one side of the feed water pump (20). A second high-pressure heater (22) is provided on one side of the first high-pressure heater (21).

8. A power system based on molten salt energy storage for power generation as described in claim 1, characterized in that: The cold molten salt tank (6) has a built-in electric heater.

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