A Molten Salt Energy Storage Peak Power Generation System Based on Steam Extraction and Thermal Storage

Abstract

This application provides a molten salt energy storage peak power generation system based on extraction steam thermal storage, belonging to the field of energy storage peak shaving technology. The molten salt energy storage peak power generation system provided in this application includes a first thermal system, an energy storage system, and a second thermal system. By connecting the first thermal system to the energy storage system, and the energy storage system to the second thermal system, all the energy generated by the first thermal system can be stored in the energy storage system. Power generation is completed by adjusting the output of the energy storage system and inputting it into the second thermal system, compensating for the power generation fluctuations caused by unstable renewable energy sources such as wind and solar power. While ensuring stable power output to the grid, it eliminates the need for significant adjustments to the output of traditional thermal power systems. This results in relatively stable temperature and pressure in the boiler within the first thermal system and also protects boiler safety, solving the problem of significant adjustments to the output of thermal power systems, which affect grid stability, due to the influence of unstable renewable energy sources.

Description

Technical Field

[0001] This application relates to the field of energy storage and peak shaving technology, and in particular to a molten salt energy storage peak power generation system based on steam extraction thermal storage. Background Technology

[0002] The utilization of renewable energy sources such as wind and solar power has developed rapidly year by year. In addition, electricity consumption has been increasing year by year, and the peak-valley difference of power grid consumption has been widening. The requirements of power grid for the frequency and depth of peak regulation of coal-fired power units have been greatly increased.

[0003] Wind and solar power, generated by wind and solar energy, need to be fed into the grid along with thermal power generated by traditional coal-fired units. When wind and sunshine are abundant, wind and solar power output is high, requiring a reduction in the output of coal-fired units, i.e., lowering the temperature and pressure output of boilers. However, wind and sunshine are unstable factors. When wind and solar power output decreases, it is necessary to increase the output of coal-fired units to achieve a stable power output to the grid.

[0004] However, the temperature and pressure of the boiler change slowly. Significantly adjusting the temperature and pressure output of the boiler not only affects the stable output of electrical energy to the power grid, but can even cause the thermal power system to fail. Summary of the Invention

[0005] In view of this, this application provides a molten salt energy storage peak power generation system based on steam extraction thermal storage, which aims to solve the problem of the impact of unstable renewable energy on the stable power grid caused by significant adjustments to the output of thermal power systems.

[0006] To achieve the above objectives, this application provides a molten salt energy storage peak power generation system based on steam extraction thermal storage, which adopts the following technical solution:

[0007] This application provides a molten salt energy storage peak power generation system based on steam extraction thermal storage, comprising: a first thermal system, an energy storage system, and a second thermal system;

[0008] The first thermal system is connected to the energy storage system, and the second thermal system is used to connect to the power grid;

[0009] The first thermal system is configured to heat and generate steam by burning coal;

[0010] The energy storage system includes a first energy storage component, a second energy storage component, and a third energy storage component. The first energy storage component, the second energy storage component, and the third energy storage component are configured to each absorb and convert the energy of the steam produced by the first thermal system and store the energy of the steam.

[0011] The second thermal system, the third energy storage component, the first energy storage component, and the second energy storage component are connected end to end in sequence;

[0012] The second thermal system is configured to heat the steam within the second thermal system sequentially through the third energy storage component, the first energy storage component, and the second energy storage component, thereby generating electrical energy for input into the power grid.

[0013] In one possible implementation, the molten salt energy storage peak power generation system based on extraction steam thermal storage provided in this application includes a boiler and a first deaerator in the first thermal system.

[0014] The boiler is connected to the first energy storage component so that the steam generated by the boiler is fed back into the boiler for reheating after the first energy storage component performs work.

[0015] The boiler, the second energy storage component, the third energy storage component, and the first deaerator are connected in sequence so that the reheated steam is sequentially delivered to the second energy storage component and the third energy storage component to perform work, and then delivered to the first deaerator.

[0016] The first deaerator is connected to the boiler so that the liquid condensed in the first deaerator enters the boiler.

[0017] In one possible implementation, the molten salt energy storage peak power generation system based on extraction steam thermal storage provided in this application includes at least one of the first energy storage component, the second energy storage component, and the third energy storage component, which includes a heat exchanger, a first storage tank, a second storage tank, and a heat release element.

[0018] The heat exchanger, the first storage tank, the heat release element, and the second storage tank are connected end to end in sequence.

[0019] The low-temperature medium in the second storage tank is heated by the heat exchanger, so that the low-temperature medium in the second storage tank becomes a high-temperature medium and is stored in the first storage tank. Then, it is heated by the heat release element and becomes a low-temperature medium and is stored in the second storage tank.

[0020] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application has the heat-releasing element in the first energy storage component being an evaporator, the heat-releasing element in the second energy storage component being a superheater, and the heat-releasing element in the third energy storage component being a feedwater heater.

[0021] The water supply heater, the evaporator, the superheater, and the second thermal system are connected in sequence.

[0022] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application further includes a first steam turbine unit, a first valve, a first condenser, and a first generator.

[0023] The boiler is connected to the first turbine unit through the first valve. The first valve is configured such that when it is open, the steam directly generated by the boiler can enter the first turbine unit through the first valve.

[0024] The first steam turbine unit is connected to the first generator, and the first generator is used to connect to the power grid;

[0025] The first steam turbine unit is connected to the first condenser, and the first condenser is connected to the first deaerator.

[0026] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application further includes a first low-pressure heater group and a first high-pressure heater group in the first thermal system.

[0027] Both the first low-pressure heater group and the first high-pressure heater group are connected to the first steam turbine unit;

[0028] The first condenser, the first low-pressure heater group, the first deaerator, the first high-pressure heater group and the boiler are connected in sequence.

[0029] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application further includes a second valve in the first thermal system;

[0030] The boiler is connected to the first turbine unit through the second valve, which is configured such that when open, the reheated steam in the boiler can enter the first turbine unit.

[0031] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application further includes a first desuperheating and pressure reducing device and a second desuperheating and pressure reducing device in the first thermal system.

[0032] The boiler, the first desuperheater and pressure reducer and the first high-pressure heater are connected in sequence. A portion of the steam directly produced by the boiler can be input into the first high-pressure heater group through the first desuperheater and pressure reducer.

[0033] The second desuperheater and pressure reducer is connected between the second valve and the first low-pressure heater group.

[0034] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application has the boiler and the first desuperheating and pressure reducing device connected end to end, and part of the steam directly generated by the boiler can also be reintroduced into the boiler through the first desuperheating and pressure reducing device.

[0035] In one possible implementation, the molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application includes a second thermal system comprising a second steam turbine unit, a second generator, a second condenser, a second low-pressure heater group, a second high-pressure heater group, and a second deaerator.

[0036] The second steam turbine unit is connected to the second generator, which is used to connect to the power grid;

[0037] The second steam turbine unit, the second condenser, the second low-pressure heater group, the second deaerator, the second high-pressure heater group, the third energy storage component, the first energy storage component, and the first energy storage component are connected end to end in sequence.

[0038] The molten salt energy storage peak power generation system based on extraction steam thermal storage provided in this application connects a first thermal system to an energy storage system, and the energy storage system to a second thermal system. All the energy generated by the first thermal system is stored in the energy storage system. By adjusting the output of the energy storage system and inputting it into the second thermal system, power generation is completed. This compensates for the power generation fluctuations caused by unstable renewable energy sources such as wind and solar power. While ensuring a stable power output to the grid, it eliminates the need for significant adjustments to the output of traditional thermal power systems. This also ensures relatively stable temperature and pressure in the boiler of the first thermal system and protects boiler safety. It solves the problem of significantly adjusting the output of thermal power systems due to unstable renewable energy sources, which affects the stability of the power grid.

[0039] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the molten salt energy storage peak power generation system based on steam extraction thermal storage provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0040] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application, and this application is not limited to the specific embodiments described below.

[0041] Figure 1 A schematic diagram of a molten salt energy storage peak power generation system based on steam extraction thermal storage provided in this application embodiment;

[0042] Figure 2 To indicate Figure 1 A schematic diagram of the interconnected structure of the first thermal system, the energy storage system, and the second thermal system.

[0043] Figure 3 for Figure 2 Schematic diagram of the first thermal system in the middle;

[0044] Figure 4 for Figure 2 A schematic diagram of the structure of a medium-sized energy storage system;

[0045] Figure 5 for Figure 2 A schematic diagram of the structure of the second thermal system.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100. First thermal system; 110. Boiler; 111. Third valve; 112. Fourth valve; 120. First deaerator; 130. First steam turbine unit; 140. First valve; 150. First condenser; 160. First generator; 170. First low-pressure heater group; 171. Second desuperheater and pressure reducer; 180. First high-pressure heater group; 181. First desuperheater and pressure reducer; 190. Second valve;

[0048] 200, Energy storage system; 210, First energy storage component; 220, Second energy storage component; 230, Third energy storage component; 240, Heat exchanger; 250, First storage tank; 260, Second storage tank; 270, Heat release element; 280, Electric heater;

[0049] 300. Second thermal system; 310. Second steam turbine unit; 320. Second generator; 330. Second condenser; 340. Second low-pressure heater unit; 350. Second high-pressure heater unit; 360. Second deaerator;

[0050] 400. Water pump.

[0051] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] In the description of this application, "multiple" means two or more, unless otherwise specified precisely.

[0056] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0057] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0058] As mentioned in the background section, in related technologies, thermal power generation may affect the stable power supply to the grid during peak shaving, and there are even safety hazards such as boiler damage when adjusting the capacity of thermal power generation. This problem arises because wind and solar power generated need to be fed into the grid along with thermal power generated by traditional coal-fired units. When wind and sunshine are abundant, wind and solar power capacity is high, requiring a reduction in the capacity of coal-fired units, i.e., reducing the temperature and pressure output of the boiler. Wind and sunshine are unstable factors; when wind and solar power decrease, the capacity of coal-fired units needs to be increased. Adjusting the temperature and pressure of the boiler is a slow process; the boiler cannot quickly change its internal pressure and temperature. Significant adjustments to the boiler's temperature and pressure output will affect the stable power output to the grid.

[0059] In addition, in related technologies, excessive adjustments to the pressure and temperature of steam inside the boiler may also cause damage to the boiler.

[0060] To address the aforementioned technical issues, this application provides a molten salt energy storage peak power generation system based on steam extraction thermal storage, comprising a first thermal system, an energy storage system, and a second thermal system. In this technical solution, by connecting the first thermal system to the energy storage system, and the energy storage system to the second thermal system, all the energy generated by the first thermal system can be stored in the energy storage system. Power generation is completed by adjusting the output of the energy storage system and inputting it into the second thermal system, thus compensating for the power generation fluctuations caused by unstable renewable energy sources such as wind and solar power. This ensures stable power output to the grid without significantly adjusting the output of traditional thermal power systems. It also maintains relatively stable temperature and pressure in the boiler within the first thermal system, protecting boiler safety and solving the problem of significantly adjusting thermal power system output due to unstable renewable energy sources, which affects the stability of the power grid.

[0061] It should be noted that, Figures 1 to 5 The diagram illustrates a simplified schematic of the components in a molten salt energy storage peak power generation system based on extraction steam storage. The specific structures of the remaining components in the same system are not limited to... Figures 1 to 5 of examples.

[0062] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0063] Reference Figure 1 and Figure 2 As shown in the embodiment of this application, a molten salt energy storage peak power generation system based on steam extraction thermal storage is provided, including a first thermal system 100, an energy storage system 200, and a second thermal system 300.

[0064] The first thermal system 100 is connected to the energy storage system 200, and the second thermal system 300 is used to connect to the power grid.

[0065] The first thermal system 100 is configured to heat and generate steam by burning coal.

[0066] The energy storage system 200 includes a first energy storage component 210, a second energy storage component 220 and a third energy storage component 230. The first energy storage component 210, the second energy storage component 220 and the third energy storage component 230 are configured to each absorb and convert the energy of the steam produced by the first thermal system 100 and store the energy of the steam.

[0067] The second thermal system 300, the third energy storage component 230, the first energy storage component 210, and the second energy storage component 220 are connected end to end in sequence.

[0068] The second thermal system 300 is configured to heat the steam in the second thermal system 300 sequentially through the third energy storage component 230, the first energy storage component 210, and the second energy storage component 220, so that the steam does work to generate electrical energy for input into the power grid.

[0069] In the above embodiment, the steam generated by the first thermal system 100 is transported to the energy storage system 200 to perform work. The energy storage system 200 stores the energy. Each energy storage component in the energy storage system 200 is sequentially connected to heat the steam in the second thermal system 300, and the steam is input into the second thermal system 300 to perform work and generate electricity. All the energy generated by the first thermal system 100 can be stored in the energy storage system 200. It can be understood that the first thermal system 100 only needs to continuously complete its production capacity and does not need to perform peak-shaving operations during peak periods, thus eliminating the need to adjust the temperature and pressure of the steam in the first thermal system 100.

[0070] In addition, by adjusting the energy release of the energy storage system 200, the production capacity of the second thermal system 300 can be adjusted and input into the power grid along with wind and solar power, thereby achieving the effect of stabilizing the power in the power grid and solving the problem of the power grid being affected by unstable renewable energy sources, which drastically adjusts the output of the thermal power system and affects the stability of the power grid.

[0071] In one possible implementation, refer to Figure 3 As shown, the first thermal system 100 includes a boiler 110 and a first deaerator 120.

[0072] Boiler 110 is connected to the first energy storage component 210, and the second energy storage component 220, the third energy storage component 230, the first deaerator 120 and boiler 110 are connected end to end.

[0073] Boiler 110 directly generates first steam, which is then sent to first energy storage component 210 to perform work. After performing work, the first steam will form third steam. At this time, the temperature and pressure of the third steam are lower than those of the first steam. The third steam will be sent back to boiler 110 for reheating and will form third steam. At this time, the temperature and pressure of the third steam are lower than those of the first steam. The third steam is then sent to second energy storage component 220 and third energy storage component 230 in sequence to perform work. After performing work in third energy storage component 230, the third steam is sent to first deaerator 120.

[0074] The first deaerator 120 is connected to the boiler 110 so that the liquid condensed in the first deaerator 120 enters the boiler 110.

[0075] In the above embodiment, the boiler 110 directly heats the water to generate high-pressure, high-temperature first steam. This first steam is then transported to the first energy storage component 210, where its energy is stored. After performing work in the first energy storage component 210, the first steam becomes third steam, with a reduced temperature and pressure. This third steam is then reintroduced into the boiler 110 for secondary heating, transforming into third steam. This third steam is then sequentially transported to the second energy storage component 220 and the third energy storage component 230 to perform work. Subsequently, the third steam experiences a significant drop in temperature and pressure, rendering it ineffective for heat exchange. At this point, the third steam liquefies and, after performing work in the third energy storage component 230, is transported to the first deaerator 120. The first deaerator 120 performs deoxygenation, removing dissolved oxygen and other gases from the feedwater, preventing and reducing corrosion of the boiler 110 and other auxiliary equipment.

[0076] Here, the steam heated from the boiler 110 undergoes at least three energy conversion processes to store most of the steam's energy in the energy storage component, thereby improving the heat exchange efficiency of the steam and the energy storage efficiency of the energy storage component, and ensuring that the energy utilization of the steam produced by the first thermal system 100 is maximized.

[0077] In one possible implementation, refer to Figure 4 As shown, at least one of the first energy storage component 210, the second energy storage component 220 and the third energy storage component 230 includes a heat exchanger 240, a first storage tank 250, a second storage tank 260 and a heat release element 270.

[0078] The heat exchanger 240, the first storage tank 250, the heat release element 270, and the second storage tank 260 are connected end to end.

[0079] The low-temperature medium in the second storage tank 260 is heated by the heat exchanger 240, so that the low-temperature medium in the second storage tank 260 becomes a high-temperature medium and is stored in the first storage tank 250. Then, it is heated by the heat release element 270 and becomes a low-temperature medium and is stored in the second storage tank 260.

[0080] In the above embodiment, the heat exchanger 240, the first storage tank 250, the heat release element 270, and the second storage tank 260 are connected end to end to form a complete cycle of heat absorption, energy storage, heat release, and storage. The heat exchanger 240 in the second energy storage component 220 is connected in series with the heat exchanger 240 in the third energy storage component 230, enabling energy to be stored in each of the first storage tanks 250.

[0081] In one possible implementation, the medium in the first energy storage component 210 is molten salt. Molten salt energy storage has the advantages of high thermal efficiency, good heat transfer performance, and high safety. Furthermore, the operating temperature of molten salt energy storage is between 290℃ and 565℃, which can adapt to the first steam with high pressure and temperature, ensuring maximum heat exchange efficiency. At least one of the second energy storage component 220 and the third energy storage component 230 uses oil as the medium. The heat exchange between the steam and the different energy storage components with different media can improve energy storage efficiency.

[0082] In one possible implementation, the heat-releasing element 270 in the first energy storage component 210 is an evaporator, the heat-releasing element 270 in the second energy storage component 220 is a superheater, and the heat-releasing element 270 in the third energy storage component 230 is a feedwater heater.

[0083] The water supply heater, evaporator, superheater, and second thermal system 300 are connected end to end in sequence.

[0084] In this way, the return water in the second thermal system 300 is first heated by the feedwater heater, and then heated by the evaporator and superheater to form high-temperature and high-pressure steam, which then enters the second thermal system 300 to perform work and generate electrical energy. The sequential connection of the feedwater heater, evaporator and superheater helps to improve the heat recovery effect.

[0085] In one possible implementation, in order to further improve the utilization rate of the third steam, the second energy storage assembly 220 also includes an electric heater 280, which is connected between the heat exchanger 240 in the second energy storage assembly 220 and the first storage tank 250 in the second energy storage assembly 220.

[0086] In one possible implementation, refer to Figure 3 As shown, the first thermal system 100 also includes a first steam turbine unit 130, a first valve 140, a first condenser 150, and a first generator 160.

[0087] Boiler 110 is connected to first turbine unit 130 through first valve 140. First valve 140 is configured such that when it is opened, some first steam can enter first turbine unit 130 through first valve 140.

[0088] The first steam turbine unit 130 is connected to the first generator 160, which is used to connect to the power grid.

[0089] The first steam turbine unit 130 is connected to the first condenser 150, and the first condenser 150 is connected to the first deaerator 120.

[0090] In the above embodiment, when the first valve 140 is open, some of the first steam can enter the first turbine unit 130 to do work. After passing through the first turbine unit 130 and the first generator 160, it generates electrical energy which is input into the power grid. After doing work, the first steam will be condensed by the first condenser 150 and then flow back into the boiler 110 through the first deaerator 120. This enables the first thermal system 100 to directly generate electrical energy and input it directly into the power grid. When the first valve 140 is closed, all the first steam generated by the first thermal system 100 is delivered to the energy storage system 200. Whether the first thermal system 100 can generate electrical energy autonomously can be controlled by opening and closing the first valve 140, further improving the production efficiency of the first thermal system 100.

[0091] In one possible implementation, the first thermal system 100 further includes a first low-pressure heater group 170 and a first high-pressure heater group 180.

[0092] Both the first low-pressure heater group 170 and the first high-pressure heater group 180 are connected to the first steam turbine group 130.

[0093] The first condenser 150, the first low-pressure heater group 170, the first deaerator 120, the first high-pressure heater group 180 and the boiler 110 are connected in sequence.

[0094] In the above embodiments, the first low-pressure heater group 170 and the first high-pressure heater group 180 can heat the return water in the first thermal system 100 to improve the heat recovery effect.

[0095] In one possible implementation, the first thermal system 100 further includes a second valve 190.

[0096] Boiler 110 is connected to first turbine unit 130 through second valve 190. Second valve 190 is configured such that when it is open, some third steam can enter first turbine unit 130 through second valve 190.

[0097] In the above embodiment, when the second valve 190 is open, some of the third steam can be input into the first turbine unit 130 to do work, and generate electrical energy through the first generator 160 and input into the power grid. When the second valve 190 is closed, all the third steam is input into the energy storage system 200 to do work. The opening and closing of the second valve 190 can determine whether the third steam can do work and generate electricity, improve the energy utilization rate of the third steam, and further improve the production efficiency of the first thermal system 100.

[0098] In one possible implementation, the first thermal system 100 further includes a first desuperheating and pressure reducing device 181 and a second desuperheating and pressure reducing device 171.

[0099] Boiler 110, first desuperheater 181 and first high-pressure heater are connected in sequence. Part of the first steam produced by boiler 110 can be input into the first high-pressure heater group 180 through first desuperheater 181.

[0100] The second desuperheater and pressure reducer 171 is connected between the second valve 190 and the first low-pressure heater group 170.

[0101] In the above embodiment, part of the first steam generated by boiler 110 can be input into the first high-pressure heater through the first desuperheating and pressure reducing device 181, and part of the third steam can be input into the first low-pressure heater through the second desuperheating and pressure reducing device 171. On the one hand, when the pressure inside boiler 110 is too high and needs to be released, the circulation loop of the first steam and the circulation loop of the third steam can facilitate the pressure regulation of boiler 110 and avoid danger inside boiler 110. On the other hand, it can prevent pipe bursting and improve safety.

[0102] In one possible implementation, a third valve 111 and a fourth valve 112 are also included. The third valve 111 is connected between the boiler 110 and the first energy storage component 210. The third valve 111 is configured such that, when open, part or all of the first steam generated in the boiler 110 enters the first energy storage component 210 through the third valve 111. The second valve 190 is connected between the boiler 110 and the second energy storage component 220. The fourth valve 112 is configured such that, when open, part or all of the third steam generated in the boiler 110 enters the second energy storage component 220 through the fourth valve 112.

[0103] In the above embodiments, when the first valve 140 is closed and the third valve 111 is open, all the first steam can be controlled to enter the first energy storage component 210; when the first valve 140 is open and the third valve 111 is closed, all the first steam can enter the first turbine unit 130 to do work; or, by adjusting the opening angle of the first valve 140 and the third valve 111, part of the first steam can be controlled to enter the first turbine unit 130 to do work, and part can enter the first energy storage component 210. It can be understood that by controlling the opening and closing states of the first valve 140 and the third valve 111, the destination of the first steam can be flexibly adjusted to improve the utilization rate of the first steam.

[0104] When the second valve 190 is closed and the fourth valve 112 is open, all the third steam can be controlled to enter the second energy storage component 220; when the second valve 190 is open and the fourth valve 112 is closed, all the third steam can enter the first turbine unit 130 to do work; or, by adjusting the opening angle of the second valve 190 and the fourth valve 112, part of the third steam can be controlled to enter the first turbine unit 130 to do work, and part can enter the second energy storage component 220. It can be understood that by controlling the opening and closing states of the second valve 190 and the fourth valve 112, the destination of the third steam can be flexibly adjusted to improve the utilization rate of the third steam.

[0105] In one possible implementation, the boiler 110 and the first desuperheater 181 are connected end to end, and part of the first steam generated by the boiler 110 can be reintroduced into the boiler 110 through the first desuperheater 181.

[0106] In the above embodiment, when the boiler 110 experiences low temperature and low pressure, the first steam can also not perform work. The first valve 140 and the third valve 111 are both closed. The first steam generated by the boiler 110 re-enters the boiler 110 after passing through the first desuperheater and pressure reducer 181 to form the third steam. This situation can reduce the energy loss of the first steam, thereby maintaining the stability within the boiler 110.

[0107] In one possible implementation, refer to Figure 5 As shown, the second thermal system 300 includes a second steam turbine unit 310, a second generator 320, a second condenser 330, a second low-pressure heater group 340, a second high-pressure heater group 350, and a second deaerator 360.

[0108] The second turbine unit 310 is connected to the second generator 320, which is used to connect to the power grid.

[0109] The second steam turbine unit 310, the second condenser 330, the second low-pressure heater unit 340, the second deaerator 360, the second high-pressure heater unit 350, the third energy storage component 230, the first energy storage component 210 and the first energy storage component 210 are connected end to end in sequence.

[0110] In the above embodiment, the return water in the second thermal system 300 sequentially enters the second steam turbine unit 310 through the feedwater heater, evaporator and superheater to do work, and generates electricity through the second generator 320 and inputs it into the power grid. The steam after doing work sequentially enters the second condenser 330, the second low-pressure heater, the second deaerator 360 and the second high-pressure heater and enters the energy storage system 200, thus forming a cycle to complete the power generation of the second thermal system 300.

[0111] It should be noted that the first low-pressure heater group 170, the first high-pressure heater group 180, the second low-pressure heater group 340 and the second high-pressure heater group 350 mentioned above are related technologies in this field, and their connection relationships with other components are not limited except for the limitations mentioned in this application.

[0112] In one possible implementation, in order to improve the smoothness of the return water stage inside the first thermal system 100 and the second thermal system 300, a feed water pump 400 is connected between the first deaerator 120 and the first high-pressure heater group 180, between the first condenser 150 and the first low-pressure heater group 170, and between the second condenser 330 and the second low-pressure heater.

[0113] In one possible implementation, refer to Figures 2 to 5 As shown in the attached diagram, to clearly illustrate the connection relationships between the first thermal system 100, the energy storage system 200, and the second thermal system 300, straight lines with arrows are used to represent the connection relationships between the inlets and outlets of each system, such as... Figure 2 As shown, the outlet A of the boiler 110 that generates the first steam is connected to the inlet a of the heat exchanger 240 in the first energy storage assembly 210, the outlet B of the heat exchanger 240 in the first energy storage assembly 210 is connected to the inlet b of the first steam entering the boiler 110, the outlet D of the boiler 110 that generates the third steam is connected to the inlet d of the heat exchanger 240 in the second energy storage assembly 220, and the outlet E of the heat exchanger 240 in the third energy storage assembly 230 is connected to the inlet e of the first deaerator 120.

[0114] The outlet F of the superheater is connected to the inlet f of the second turbine unit 310, and the outlet G of the second high-pressure heater is connected to the inlet g of the feedwater heater.

[0115] The implementation principle of the molten salt energy storage peak power generation system based on extraction thermal storage provided in this application embodiment is as follows: A molten salt energy storage peak power generation system based on extraction thermal storage includes a first thermal system 100, an energy storage system 200, and a second thermal system 300. By connecting the first thermal system 100 to the energy storage system 200, and the energy storage system 200 to the second thermal system 300, all the energy generated by the first thermal system 100 can be stored in the energy storage system 200. By adjusting the output of the energy storage system 200 and inputting it into the second thermal system 300, power generation is completed, compensating for the power generation fluctuations caused by unstable renewable energy sources such as wind and solar power. While ensuring stable power output to the grid, it eliminates the need for significant adjustments to the output of traditional thermal power systems. This results in relatively stable temperature and pressure of the boiler 110 in the first thermal system 100 and also protects the safety of the boiler 110. This solves the problem of significantly adjusting the output of thermal power systems due to unstable renewable energy sources, which affects the stability of power grid output.

[0116] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein.

[0117] This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The description and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0118] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A molten salt energy storage peak power generation system based on steam extraction thermal storage, characterized in that, include: First thermal system, energy storage system, and second thermal system; The first thermal system is connected to the energy storage system, and the second thermal system is used to connect to the power grid; The first thermal system is configured to heat and generate steam by burning coal; The energy storage system includes a first energy storage component, a second energy storage component, and a third energy storage component. The first energy storage component, the second energy storage component, and the third energy storage component are configured to each absorb and convert the energy of the steam produced by the first thermal system and store the energy of the steam. The second thermal system, the third energy storage component, the first energy storage component, and the second energy storage component are connected end to end in sequence; The second thermal system is configured to heat the steam within the second thermal system sequentially through the third energy storage component, the first energy storage component, and the second energy storage component, thereby generating electrical energy for input into the power grid. The first thermal system includes a boiler and a first deaerator; The boiler is connected to the first energy storage component so that the steam generated by the boiler is fed back into the boiler for reheating after the first energy storage component performs work. The boiler, the second energy storage component, the third energy storage component, and the first deaerator are connected in sequence so that the reheated steam is sequentially delivered to the second energy storage component and the third energy storage component to perform work, and then delivered to the first deaerator. The first deaerator is connected to the boiler so that the liquid condensed in the first deaerator enters the boiler; At least one of the first energy storage component, the second energy storage component, and the third energy storage component includes a heat exchanger, a first storage tank, a second storage tank, and a heat release element; The heat exchanger, the first storage tank, the heat release element, and the second storage tank are connected end to end in sequence. The low-temperature medium in the second storage tank is heated by the heat exchanger, so that the low-temperature medium in the second storage tank becomes a high-temperature medium and is stored in the first storage tank. Then, it is heated by the heat release element and becomes a low-temperature medium and is stored in the second storage tank. The heat-releasing element in the first energy storage component is an evaporator, the heat-releasing element in the second energy storage component is a superheater, and the heat-releasing element in the third energy storage component is a feedwater heater; The water supply heater, the evaporator, the superheater, and the second thermal system are connected in sequence.

2. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to claim 1, characterized in that, The first thermal system also includes a first steam turbine unit, a first valve, a first condenser, and a first generator; The boiler is connected to the first turbine unit through the first valve. The first valve is configured such that when it is open, the steam directly generated by the boiler can enter the first turbine unit through the first valve. The first steam turbine unit is connected to the first generator, and the first generator is used to connect to the power grid; The first steam turbine unit is connected to the first condenser, and the first condenser is connected to the first deaerator.

3. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to claim 2, characterized in that, The first thermal system also includes a first low-pressure heater group and a first high-pressure heater group; Both the first low-pressure heater group and the first high-pressure heater group are connected to the first steam turbine unit; The first condenser, the first low-pressure heater group, the first deaerator, the first high-pressure heater group and the boiler are connected in sequence.

4. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to claim 3, characterized in that, The first thermal system also includes a second valve; The boiler is connected to the first turbine unit through the second valve, which is configured such that when open, the reheated steam in the boiler can enter the first turbine unit.

5. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to claim 4, characterized in that, The first thermal system also includes a first desuperheating and pressure reducing device and a second desuperheating and pressure reducing device; The boiler, the first desuperheater and pressure reducer and the first high-pressure heater group are connected in sequence. A portion of the steam directly produced by the boiler can be input into the first high-pressure heater group through the first desuperheater and pressure reducer. The second desuperheater and pressure reducer is connected between the second valve and the first low-pressure heater group.

6. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to claim 5, characterized in that, The boiler is connected to the first desuperheater and pressure reducer in sequence. A portion of the steam directly generated by the boiler can also be reintroduced into the boiler via the first desuperheater and pressure reducer.

7. The molten salt energy storage peak power generation system based on steam extraction thermal storage according to any one of claims 1 to 6, characterized in that, The second thermal system includes a second steam turbine unit, a second generator, a second condenser, a second low-pressure heater unit, a second high-pressure heater unit, and a second deaerator; The second steam turbine unit is connected to the second generator, which is used to connect to the power grid; The second steam turbine unit, the second condenser, the second low-pressure heater group, the second deaerator, the second high-pressure heater group, the third energy storage component, the first energy storage component, and the first energy storage component are connected end to end in sequence.

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