Energy storage peak regulation device and coal power unit

Abstract

The invention relates to an energy storage peak regulation device and a coal power unit. The energy storage peak shaving device comprises an energy storage assembly communicating with a main steam turbine, and the energy storage assembly is used for conducting heat exchange between a heat storage medium stored in the energy storage assembly and part of steam of the main steam turbine; the first energy release assembly communicates with the energy storage assembly and is used for converting heat energy in the heat storage medium into electric energy to be output; the second energy release assembly communicates with the energy storage assembly and is used for heating condensate water discharged by the condenser through the heat storage medium; the detection assembly is arranged in the energy storage assembly and used for detecting the medium temperature of the heat storage medium; and the control assembly is used for controlling the energy storage assembly to store heat energy in the power grid valley period and controlling the first energy release assembly or the second energy release assembly to release the heat energy stored in the energy storage assembly in the power grid peak period according to the medium temperature. According to the method, the corresponding heat release path is selected by considering the actual condition of the heat storage medium, and efficient utilization of the stored heat is facilitated.

Description

Technical Field

[0001] This application relates to the field of power generation technology, and in particular to an energy storage peak-shaving device and a coal-fired power unit. Background Technology

[0002] Traditional coal-fired power units typically consist of a boiler, main turbine, condenser, deaerator, high-pressure heater, and booster pump. Water is compressed and pressurized in the booster pump, then enters the deaerator to filter out excess oxygen. After being heated in the high-pressure heater, it enters the boiler to be heated and vaporized into steam. The steam enters the turbine, expands, and does work to drive the turbine to supply power to the grid. The steam after doing work enters the condenser to be cooled back into water, and finally returns to the booster pump to complete a cycle.

[0003] Currently, with the increasing proportion of renewable energy power generation, the power grid is placing increasingly higher demands on the peak-shaving capacity and operational flexibility of coal-fired power units. However, when traditional coal-fired power units participate in deep peak shaving, the frequently changing loads cause the boiler combustion conditions to deviate from the optimal design point, resulting in a significant decrease in boiler combustion efficiency and an increase in the unit coal consumption for power generation.

[0004] To address these issues, the industry has proposed coupling energy storage systems with coal-fired power units. This allows the energy storage system to respond to grid load changes, thereby reducing the negative impact of frequent load fluctuations on the boiler. However, current coupling technologies offer only a single method for releasing the stored heat in the energy storage system. They fail to consider the actual conditions of the heat storage medium when releasing heat, resulting in some of the stored heat being difficult to utilize efficiently, ultimately reducing the overall energy efficiency of the coupling device. Summary of the Invention

[0005] Therefore, it is necessary to provide an energy storage peak-shaving device and coal-fired power unit that can flexibly adjust the heat storage release form based on the actual situation of the heat storage medium.

[0006] In one aspect, an energy storage and peak-shaving device is provided, the device being installed in a coal-fired power unit, the unit comprising a boiler, a main steam turbine, a booster pump, and a condenser, the main steam turbine supplying power to the grid, the energy storage and peak-shaving device comprising:

[0007] An energy storage component is connected to the main steam turbine. The energy storage component contains a heat storage medium. The energy storage component is used to enable heat exchange between the heat storage medium and part of the steam in the main steam turbine, so that the heat storage medium stores thermal energy.

[0008] The first energy-releasing component is connected to the energy storage component and is used to convert the thermal energy stored in the thermal storage medium into electrical energy for output to the power grid.

[0009] The second energy release component is disposed between the booster pump and the condenser and is connected to the energy storage component, and is used to reheat the condensate discharged from the condenser using the heat energy stored in the heat storage medium.

[0010] A detection component is disposed within the energy storage component and is used to detect the temperature of the thermal storage medium within the energy storage component.

[0011] A control component is connected to the power grid, the detection component, the first energy release component, and the second energy release component, respectively, for controlling the energy storage component to store thermal energy during off-peak hours of the power grid, and for controlling the first energy release component or the second energy release component to release the thermal energy stored in the energy storage component during peak hours of the power grid according to the medium temperature.

[0012] In one embodiment, the energy storage component includes:

[0013] A cryogenic tank is used to store the heat storage medium after the heat energy has been released;

[0014] A high-temperature tank is used to store the heat storage medium after heat energy storage;

[0015] A circulating pump is installed inside the low-temperature tank and the high-temperature tank and connected to the control component to drive the flow of the heat storage medium inside the low-temperature tank and the high-temperature tank;

[0016] The heat exchange pipeline is connected to the cryogenic tank, the high-temperature tank, and the main steam turbine, respectively, for enabling heat exchange between the heat storage medium in the high-temperature tank and / or the cryogenic tank and a portion of the steam in the main steam turbine.

[0017] In one embodiment, the heat exchange piping includes:

[0018] The first heat exchanger has its steam inlet and steam outlet connected to the steam pipeline inside the main steam turbine, its heat storage medium inlet connected to the heat storage medium outlet of the low-temperature tank, and its heat storage medium outlet connected to the heat storage medium inlet of the high-temperature tank; wherein, the first heat exchanger is used to enable heat exchange between a portion of the steam inside the main steam turbine and the heat storage medium.

[0019] A first regulating valve is disposed between the steam inlet of the first heat exchanger and the steam pipeline inside the main steam turbine, and is connected to the control component; wherein, the first regulating valve is used to adjust its own opening degree according to the control of the control component;

[0020] The second regulating valve is located between the steam output end of the first heat exchanger and the steam pipeline inside the main steam turbine, and is connected to the control component; wherein, the second regulating valve is used to adjust its own opening degree according to the control of the control component.

[0021] In one embodiment, the coal-fired power unit further includes a deaerator and a high-pressure heater, and the steam output end of the first heat exchanger is connected to both the deaerator and the high-pressure heater. The heat exchange pipeline further includes:

[0022] A third regulating valve is disposed between the steam output end of the first heat exchanger and the deaerator, and is connected to the control component; wherein, the third regulating valve is used to adjust its own opening degree according to the control of the control component;

[0023] A fourth regulating valve is disposed between the steam output end of the first heat exchanger and the high-pressure heater, and is connected to the control component; wherein, the fourth regulating valve is used to adjust its own opening degree according to the control of the control component.

[0024] In one embodiment, the first energy-releasing component includes:

[0025] A steam generator, the input end of which is connected to the heat storage medium output end of the high-temperature tank, and the output end of which is connected to the heat storage medium input end of the low-temperature tank, the steam generator is also connected to the control component; wherein, the steam generator is used to generate steam based on the thermal energy stored in the heat storage medium;

[0026] An auxiliary steam turbine is connected to the steam output terminal of the steam generator and is used to supply power to the power grid under the drive of the steam generated by the steam generator.

[0027] In one embodiment, the second energy-releasing component includes:

[0028] The second heat exchanger has its heat storage medium input end connected to the heat storage medium output end of the high-temperature tank, its heat storage medium output end connected to the heat storage medium input end of the low-temperature tank, its condensate input end connected to the condensate output end of the condenser, and its condensate output end connected to the booster pump. The second heat exchanger is also connected to the control component. The second heat exchanger is used to enable heat exchange between the heat storage medium and the condensate discharged from the condenser.

[0029] In one embodiment, the control component is configured to:

[0030] When the grid load is less than the first load threshold, it is determined that the grid is in a low period. During the low period, the opening of the first regulating valve is controlled to a preset opening, the opening of the second regulating valve is controlled to the maximum value, the opening of the third regulating valve and the fourth regulating valve is controlled to zero, and the circulating pump is controlled to work.

[0031] In one embodiment, the control component is configured to:

[0032] When the grid load is greater than the second load threshold, it is determined that the grid is in a peak period. During the peak period, the temperature of the heat storage medium in the high-temperature tank is obtained. When the medium temperature is greater than or equal to the temperature threshold, the first energy release component is controlled to work, the second energy release component is controlled to not work, and the circulation pump is controlled to drive the heat storage medium in the high-temperature tank to flow to the first energy release component.

[0033] In one embodiment, the control component is configured to:

[0034] When the grid load is greater than the second load threshold, it is determined that the grid is in a peak period. During the peak period, the temperature of the heat storage medium in the high-temperature tank is obtained. When the medium temperature is less than the temperature threshold, the first energy release component is controlled to not work, the second energy release component is controlled to work, and the circulation pump is controlled to drive the heat storage medium in the high-temperature tank to flow to the second energy release component.

[0035] In another aspect, a coal-fired power unit is provided, including the energy storage and peak-shaving device described in any of the above embodiments.

[0036] In the technical solution provided in this application, an energy storage peak-shaving device is installed on a coal-fired power unit. The device includes an energy storage component, a first energy release component, a second energy release component, a detection component, and a control component. The energy storage component stores a heat storage medium. The detection component detects the temperature of the heat storage medium within the energy storage component. Under the control of the control component, the energy storage component stores thermal energy during off-peak hours. Under the control of the control component, either the first or second energy release component releases the stored thermal energy during peak hours, thus completing the peak-shaving for the coal-fired power unit. In this technical solution, the first energy release component supplements the coal-fired power unit's output by generating additional electricity during peak hours. The second energy release component indirectly increases the coal-fired power unit's output by raising the temperature of the condensate input to the boiler during peak hours. The control component selects the corresponding heat release path based on the temperature of the heat storage medium detected by the detection component. Therefore, the technical solution provided in this application sets up multiple heat release paths, fully considering the actual situation of the heat storage medium, which is conducive to the efficient utilization of heat storage. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an energy storage and peak-shaving device;

[0039] Figure 2 This is a schematic diagram of a connection method between an energy storage and peak-shaving device and a coal-fired power unit.

[0040] Figure 3 This is a schematic diagram illustrating another connection method between an energy storage and peak-shaving device and a coal-fired power unit.

[0041] Figure 4 This is a schematic diagram of the structure of a coal-fired power unit.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Energy storage component; 110. Cryogenic tank; 120. High temperature tank; 130. Circulating pump; 140. Heat exchange pipeline; 141. First heat exchanger; 142. First regulating valve; 143. Second regulating valve; 144. Steam mixer; 145. Third regulating valve; 146. Fourth regulating valve; 200. First energy release component; 210. Steam generator; 220. Auxiliary steam turbine; 300. Second energy release component; 310. Second heat exchanger; 400. Detection component; 500. Control component. Detailed Implementation

[0044] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0046] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0047] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0048] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0049] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0050] This application provides an energy storage peak-shaving device and a coal-fired power unit, aiming to solve the technical problem of low energy utilization efficiency in existing coupling schemes of energy storage systems and coal-fired power units due to the single form of heat release and the inability to flexibly adjust according to the actual situation of the heat storage medium. This energy storage peak-shaving device, by setting up an energy storage component 100, a first energy release component 200, and a second energy release component 300, and having a control component 500 select different energy release paths according to the medium temperature of the heat storage medium detected by the detection component 400, achieves efficient and flexible utilization of stored heat energy, significantly improving the energy utilization efficiency and peak-shaving flexibility of the entire coupling device.

[0051] The energy storage and peak-shaving device is installed on the coal-fired power unit and is specifically connected to the steam pipeline of the coal-fired power unit. In one possible implementation scenario, the coal-fired power unit includes a boiler, a main steam turbine, a booster pump, and a condenser. The boiler is connected to the main steam turbine. After generating steam, the boiler outputs it to the main steam turbine, which drives the main steam turbine to work and generate electricity for the grid. After doing work in the main steam turbine, the steam is output to the condenser connected to the main steam turbine. The condenser condenses the steam into condensate, which is then transported to the booster pump connected to the condenser. After being pressurized and heated by the booster pump, the condensate is transported back to the boiler connected to the booster pump, completing one complete thermodynamic cycle.

[0052] In one embodiment, refer to Figure 1 A peak-shaving energy storage device is provided, comprising:

[0053] The energy storage component 100 is connected to the main steam turbine. The energy storage component 100 contains a heat storage medium. The energy storage component 100 is used to enable heat exchange between the heat storage medium and part of the steam in the main steam turbine so that the heat storage medium can store thermal energy.

[0054] The first energy-releasing component 200 is connected to the energy storage component 100 and is used to convert the thermal energy stored in the thermal storage medium into electrical energy for output to the power grid.

[0055] The second energy release component 300 is located between the booster pump and the condenser and is connected to the energy storage component 100. It is used to reheat the condensate discharged from the condenser by using the heat energy stored in the heat storage medium.

[0056] The detection component 400 is installed inside the energy storage component 100 and is used to detect the temperature of the heat storage medium inside the energy storage component 100.

[0057] The control component 500 is connected to the power grid, the detection component 400, the first energy release component 200 and the second energy release component 300 respectively. It is used to control the energy storage component 100 to store thermal energy during the off-peak period of the power grid, and to control the first energy release component 200 or the second energy release component 300 to release the thermal energy stored in the energy storage component 100 during the peak period of the power grid according to the medium temperature.

[0058] Specifically, the energy storage component 100 is connected to the steam pipeline inside the main steam turbine. The energy storage component 100 contains a heat storage medium. The energy storage component 100 transfers and stores some of the steam's thermal energy by exchanging heat between the heat storage medium and a portion of the steam generated during power generation. The heat storage medium can be an organic phase change heat storage material, a low-melting-point alloy phase change heat storage material, or other materials with good thermodynamic properties. In a preferred embodiment, molten salt is used as the heat storage medium; specifically, a binary nitrate molten salt with an operating temperature range of 280-565℃ can be selected. The capacity of the container in the energy storage component 100 for storing the heat storage medium can be set according to the actual operating conditions of the coal-fired power unit. In a feasible embodiment, the volume of the container in the energy storage component 100 for storing the heat storage medium is designed to store 20% of the rated power of the coal-fired power unit for 4 hours.

[0059] The first energy-releasing component 200 is connected to the energy storage component 100. The first energy-releasing component 200 can absorb the thermal energy stored in the thermal storage medium in the energy storage component 100, convert this part of the thermal energy into electrical energy, and output the electrical energy to the power grid connected to the coal-fired power unit, thereby assisting the coal-fired power unit to output power to the power grid and directly increasing the total power generation capacity of the coal-fired power unit.

[0060] The second energy release component 300 is located between the booster pump and the condenser. The second energy release component 300 is also connected to the energy storage component 100. The condensate flowing between the booster pump and the condenser passes through the second energy release component 300, where it absorbs the heat energy stored in the heat storage medium of the energy storage component 100. After reheating, the condensate is driven by the booster pump to flow to the boiler. In the second energy release component 300, the condensate is reheated by the heat energy stored in the heat storage medium of the energy storage component 100, increasing the boiler feedwater temperature. This means the boiler can heat water into steam with less fuel, thereby improving the overall power generation efficiency of the unit while consuming the same amount of fuel, indirectly increasing the total power generation capacity of the coal-fired power unit.

[0061] A detection component 400 is disposed within the energy storage component 100, specifically within a container in the energy storage component 100 for storing the heat storage medium, and is used to monitor the temperature of the heat storage medium in real time. In one feasible embodiment, the detection component 400 may include a temperature sensor, which is directly placed or immersed in the heat storage medium. In another feasible embodiment, the detection component 400 may further include an infrared sensor, disposed on the inner wall of the container in the energy storage component 100 for storing the heat storage medium.

[0062] The control component 500 is electrically or communicatively connected to the power grid, the detection component 400, the first energy release component 200, and the second energy release component 300. The control component 500 monitors the power grid load in real time, controlling the energy storage component 100 to store thermal energy during off-peak hours and controlling either the first energy release component 200 or the second energy release component 300 to release the thermal energy stored in the energy storage component 100 during peak hours. Simultaneously, when the energy storage peak-shaving device releases thermal energy, the control component 500 selects whether to release heat through the first energy release component 200 or the second energy release component 300 based on the temperature of the thermal storage medium in the energy storage component 100. In one feasible embodiment, the control component 500 may specifically be the main control board of a coal-fired power unit.

[0063] It should be noted that the off-peak period refers to the time of day when the grid load is relatively low, while the peak period refers to the time of day when the grid load is relatively high. The definitions of off-peak and peak periods vary depending on the region and season. When the region and season are specific, there are clear time ranges defined. For example, under the definition of the Hunan power grid, the off-peak period is from 00:00 to 06:00 and from 12:00 to 14:00 daily, while the remaining time of the day is the peak period. In one feasible embodiment, the control component 500 can determine whether it is in an off-peak or peak period based on the current time.

[0064] In the technical solution provided in this application, an energy storage peak-shaving device is installed on a coal-fired power unit. The energy storage peak-shaving device includes an energy storage component 100, a first energy release component 200, a second energy release component 300, a detection component 400, and a control component 500. The energy storage component 100 stores a heat storage medium. The detection component 400 detects the temperature of the heat storage medium in the energy storage component 100. Under the control of the control component 500, the energy storage component 100 stores heat energy during off-peak hours of the power grid. Under the control of the control component 500, the first energy release component 200 or the second energy release component 300 releases the heat energy stored in the energy storage component 100 during peak hours of the power grid, thereby completing the peak-shaving of the coal-fired power unit. In the technical solution provided in this application, the first energy release component 200 supplements the output of the coal-fired power unit by generating additional electricity during peak grid periods. The second energy release component 300 indirectly increases the power generation of the coal-fired power unit by raising the temperature of the condensate input to the boiler during peak grid periods. The control component 500 selects the corresponding heat release path based on the real-time temperature of the heat storage medium detected by the detection component 400. Therefore, the technical solution provided in this application sets up multiple heat release paths, fully considering the actual situation of the heat storage medium, which is conducive to the efficient utilization of heat storage.

[0065] In one embodiment, refer to Figure 2 The energy storage component 100 includes:

[0066] Low-temperature tank 110 is used to store the heat storage medium after the heat energy has been released;

[0067] High-temperature tank 120 is used to store the heat storage medium after thermal energy storage;

[0068] A circulation pump 130 is installed in the low-temperature tank 110 and the high-temperature tank 120 and connected to the control component 500 to drive the heat storage medium in the low-temperature tank 110 and the high-temperature tank 120 to flow.

[0069] The heat exchange pipeline 140 is connected to the cryogenic tank 110, the high-temperature tank 120 and the main steam turbine respectively, and is used to enable heat exchange between the heat storage medium in the high-temperature tank 120 and / or the cryogenic tank 110 and part of the steam in the main steam turbine.

[0070] Specifically, the low-temperature tank 110 is used to store the heat storage medium after the energy release process and the temperature reduction, and the high-temperature tank 120 is used to store the heat storage medium after the heat storage process and the temperature rise after absorbing steam heat. The high-temperature tank 120 and the low-temperature tank 110 are connected to the main steam turbine through the heat exchange pipeline 140. The high-temperature tank 120 and the low-temperature tank 110 are equipped with a circulation pump 130. The heat storage medium stored in the high-temperature tank 120 and the low-temperature tank 110 flows under the drive of the circulation pump 130. The circulation pump 130 is connected to the control component 500. The start, stop and speed of the circulation pump 130 are controlled by the control component 500, thereby realizing the control of the flow rate of the heat storage medium.

[0071] The heat exchange pipeline 140 serves as the physical carrier for heat exchange between excess steam and the heat storage medium. When the heat storage medium needs to store energy, it flows within the heat exchange pipeline 140 under the drive of the circulating pump 130, and exchanges heat with the excess steam during the flow.

[0072] In one feasible embodiment, the low-temperature heat storage medium starts from the low-temperature tank 110, is driven by the circulation pump 130 and flows to a specific heat exchange area in the heat exchange pipeline 140. In this heat exchange area, it exchanges heat with the excess steam of the main steam turbine, absorbs the heat energy of the excess steam and becomes a high-temperature heat storage medium, and is then driven by the circulation pump 130 to flow back to the high-temperature tank 120.

[0073] In one feasible embodiment, the heat exchange pipeline 140 can extract excess steam from different locations of the main steam turbine. For example, in some implementation scenarios, the main steam turbine includes a high-pressure cylinder, a reheater, an intermediate-pressure cylinder, and a low-pressure cylinder connected in sequence. In this case, the heat exchange pipeline 140 can extract steam from the steam pipeline between the high-pressure cylinder and the reheater, or it can extract steam from the steam pipeline between the reheater and the intermediate-pressure cylinder.

[0074] In the above embodiments, the high-temperature tank 120, low-temperature tank 110, heat exchange pipeline 140 and circulation pump 130 are respectively provided, and the heat storage medium flows efficiently in the energy storage component 100, so that the energy storage component 100 can efficiently and reliably complete the storage of thermal energy and the transportation of heat storage medium.

[0075] In one embodiment, continue to refer to Figure 2 The heat exchange pipeline 140 includes:

[0076] The first heat exchanger 141 has its steam inlet and steam outlet connected to the steam pipeline inside the main steam turbine, its heat storage medium inlet connected to the heat storage medium outlet of the low-temperature tank 110, and its heat storage medium outlet connected to the heat storage medium inlet of the high-temperature tank 120; wherein, the first heat exchanger 141 is used to enable heat exchange between part of the steam inside the main steam turbine and the heat storage medium.

[0077] The first regulating valve 142 is located between the steam input end of the first heat exchanger 141 and the steam pipeline in the main steam turbine, and is connected to the control component 500; wherein, the first regulating valve 142 is used to adjust its own opening degree according to the control of the control component 500.

[0078] The second regulating valve 143 is located between the steam output end of the first heat exchanger 141 and the steam pipeline in the main steam turbine, and is connected to the control component 500; wherein, the second regulating valve 143 is used to adjust its own opening degree according to the control of the control component 500.

[0079] Specifically, the first heat exchanger 141, as the main heat exchange device in the heat exchange pipeline 140, can be a shell-and-tube or plate heat exchanger. The first heat exchanger 141 has four ports: a steam inlet and a steam outlet on the steam side, and a heat storage medium inlet and a heat storage medium outlet on the heat storage medium side. The steam inlet and steam outlet form a pipeline within the first heat exchanger 141 for flowing steam, and the heat storage medium inlet and heat storage medium outlet form a pipeline within the first heat exchanger 141 for flowing low-temperature heat storage medium. Both the steam inlet and steam outlet of the first heat exchanger 141 are connected to the steam pipeline within the main steam turbine. The heat storage medium inlet of the first heat exchanger 141 is connected to the heat storage medium outlet of the low-temperature tank 110, and the heat storage medium outlet of the first heat exchanger 141 is connected to the heat storage medium inlet of the high-temperature tank 120.

[0080] A first regulating valve 142 is provided between the steam input end of the first heat exchanger 141 and the steam pipeline in the main steam turbine. The first regulating valve 142 is connected to the control component 500 and can adjust its opening degree based on the control of the control component 500. The first regulating valve 142 is used to control the flow rate of steam extracted from the steam pipeline of the main steam turbine.

[0081] A second regulating valve 143 is provided between the steam output end of the first heat exchanger 141 and the steam pipeline in the main steam turbine. The second regulating valve 143 is connected to the control component 500 and can adjust its own opening degree based on the control of the control component 500. The second regulating valve 143 is used to control the flow rate of steam that has passed through the heat exchange and returned to the main steam turbine.

[0082] Reference Figure 2 In one embodiment, both the steam inlet and steam outlet of the first heat exchanger 141 are connected to the steam pipeline between the reheater and the intermediate-pressure cylinder of the main steam turbine. Based on this embodiment, the heat exchange process of the first heat exchanger 141 is described as follows:

[0083] During off-peak hours, some steam in the main turbine steam pipeline is drawn to the first heat exchanger 141 via the first regulating valve 142. The steam then flows into the first heat exchanger 141 through its steam inlet. Meanwhile, the cryogenic heat storage medium in the cryogenic tank 110 flows to the first heat exchanger 141 under the drive of the circulating pump 130, entering the first heat exchanger 141 through its heat storage medium inlet. Subsequently, within the first heat exchanger 141, high-temperature steam flows from its steam inlet to its steam outlet, while the cryogenic heat storage medium flows from its inlet to its outlet. During this process, the cryogenic heat storage medium absorbs heat energy from the high-temperature steam, becoming a high-temperature heat storage medium, while the excess high-temperature steam cools down due to heat release, thus achieving heat exchange. After the heat exchange is completed, the high-temperature heat storage medium flows from the heat storage medium output end of the first heat exchanger 141 to the high-temperature tank 120 and is stored in the high-temperature tank 120, while the steam with a lower temperature returns to the steam pipeline of the main steam turbine to continue to do work.

[0084] Through the above embodiments, the heat exchange process during off-peak hours of the power grid is controlled by the first regulating valve 142 and the second regulating valve 143. The first regulating valve 142 and the second regulating valve 143 work together under the unified scheduling of the control component 500 to ensure the smooth start-up, precise control and safe shutdown of the heat storage process.

[0085] In one feasible embodiment, reference is made to Figure 3 The heat exchange pipeline 140 also includes a steam mixer 144, which is located between the steam output end of the first heat exchanger 141 and the steam pipeline of the main steam turbine. The steam mixer 144 is used to uniformly mix the steam returning from the heat exchange pipeline with the steam that has not been heat exchanged.

[0086] Through the above embodiments, the two parts of steam are actively mixed to avoid excessive thermal shock to the main turbine caused by the steam returning through the heat exchange pipeline, thereby improving system stability.

[0087] In one embodiment, continue to refer to Figure 3 The coal-fired power unit also includes a deaerator and a high-pressure heater. The steam output end of the first heat exchanger 141 is also connected to the deaerator and the high-pressure heater respectively. The heat exchange pipeline 140 also includes:

[0088] The third regulating valve 145 is located between the steam output end of the first heat exchanger 141 and the deaerator, and is connected to the control component 500; wherein, the third regulating valve 145 is used to adjust its own opening degree according to the control of the control component 500.

[0089] The fourth regulating valve 146 is located between the steam output end of the first heat exchanger 141 and the high-pressure heater, and is connected to the control component 500; wherein, the fourth regulating valve 146 is used to adjust its own opening degree according to the control of the control component 500.

[0090] Specifically, in some implementation scenarios, coal-fired power units also include a deaerator and a high-pressure heater. The high-pressure heater is connected to the boiler, and the deaerator is connected to the high-pressure heater. The high-pressure heater is used to reheat the boiler feedwater to improve the boiler's operating efficiency, and the deaerator is used to remove oxygen and other gases contained in the boiler feedwater.

[0091] In this embodiment, the steam output end of the first heat exchanger 141 is also connected to a deaerator and a high-pressure heater, respectively. A third regulating valve 145 is provided between the steam output end of the first heat exchanger 141 and the deaerator, and a fourth regulating valve 146 is provided between the steam output end of the first heat exchanger 141 and the high-pressure heater. Both the third regulating valve 145 and the fourth regulating valve 146 are connected to the control component 500 and receive control from the control component 500 to change their opening degree.

[0092] When the opening of the third regulating valve 145 is not zero, a portion of the steam after heat exchange in the first heat exchanger 141 will flow to the deaerator to heat the feedwater and remove dissolved oxygen from the water. When the opening of the fourth regulating valve 146 is not zero, a portion of the steam after heat exchange in the first heat exchanger 141 will flow to the high-pressure heater to further increase the feedwater temperature of the boiler.

[0093] In the above embodiment, the first heat exchanger 141 is provided with multiple steam outlets. The control component 500 can control the destination of the steam after heat exchange in the first heat exchanger 141 by controlling the opening of the second regulating valve 143, the third regulating valve 145, and the fourth regulating valve 146. Since the demand for extraction steam in the deaerator and high-pressure heater of the coal-fired power unit varies under different loads, the control component 500 can determine the destination of the steam after heat exchange in the first heat exchanger 141 according to the real-time demand of the coal-fired power unit. For example, when the main turbine needs more steam to do work, the second regulating valve 143 is opened first; when the heat load of the deaerator or high-pressure heater is insufficient, the third regulating valve 145 or the fourth regulating valve 146 can be opened to supplement it.

[0094] The above embodiments further enhance the flexibility of the energy storage and peak-shaving device provided in this application, enabling the energy storage and peak-shaving device to be compatible with various operating conditions of coal-fired power units.

[0095] In one embodiment, refer to Figure 2 or Figure 3 The first energy-releasing component 200 includes:

[0096] Steam generator 210 has its heat storage medium input end connected to the heat storage medium output end of high temperature tank 120 and its heat storage medium output end connected to the heat storage medium input end of low temperature tank 110. Steam generator 210 is also connected to control component 500. Steam generator 210 is used to generate steam based on the heat energy stored in the heat storage medium.

[0097] The auxiliary steam turbine 220 is connected to the steam output end of the steam generator 210 and is used to supply power to the power grid under the drive of the steam generated by the steam generator 210.

[0098] Specifically, the steam generator 210 is a steam generating device independent of the boiler. Its heat source comes from the heat storage medium in the energy storage component 100. The steam generator 210 can generate steam using the heat energy in the high-temperature heat storage medium. The steam generator 210 has a heat storage medium inlet, a heat storage medium outlet, and a steam outlet. Of course, to generate steam, the steam generator 210 also has an internal water storage container or a water inlet connected to an external water storage container. The heat storage medium inlet of the steam generator 210 is connected to the outlet of the high-temperature tank 120 to receive the high-temperature heat storage medium. The heat storage medium outlet of the steam generator 210 is connected to the inlet of the low-temperature tank 110 to return the low-temperature heat storage medium that has cooled down after releasing heat. Water flows inside the steam generator 210, absorbing heat energy from the high-temperature heat storage medium and converting it into steam, which is output from the steam outlet of the steam generator 210.

[0099] The steam generator 210 is directly controlled by the control component 500. When the control component 500 determines that energy needs to be released through this path, it starts the steam generator 210 so that the thermal energy in the energy storage component 100 can be released through the steam generator 210.

[0100] The auxiliary steam turbine 220 is an auxiliary power generation device independent of the main steam turbine. Typically, the auxiliary steam turbine 220 is smaller in scale than the main steam turbine and is specifically designed for peak shaving. Like the main steam turbine, it is connected to the power grid. The steam input of the auxiliary steam turbine 220 is connected to the steam output of the steam generator 210. The auxiliary steam turbine 220 is driven by the steam generated by the steam generator 210 to rotate and perform work, which in turn drives a coaxial generator to generate electricity, which is then transmitted to the power grid. This portion of the generated power is completely independent of the incremental power of the main steam turbine. Its magnitude can be quickly adjusted according to peak shaving needs by regulating the flow rate of the heat storage medium entering the steam generator 210, with a response speed much faster than adjusting the boiler combustion. In a specific application, the power generation of the auxiliary steam turbine 220 can account for 15%-25% of the total output of the entire coal-fired power unit, providing considerable peak shaving capacity.

[0101] In one embodiment, refer to Figure 2 or Figure 3The second energy-releasing component 300 includes:

[0102] The second heat exchanger 310 has its heat storage medium input end connected to the heat storage medium output end of the high-temperature tank 120, its heat storage medium output end connected to the heat storage medium input end of the low-temperature tank 110, its condensate input end connected to the condensate output end of the condenser, and its condensate output end connected to the booster pump. The second heat exchanger 310 is also connected to the control component 500. The second heat exchanger 310 is used to enable heat exchange between the heat storage medium and the condensate discharged from the condenser.

[0103] Specifically, the second heat exchanger 310, as the main heat exchange device in the second energy release assembly 300, can be a shell-and-tube or plate heat exchanger. The second heat exchanger 310 has four ports: a condensate inlet and a condensate outlet on the condensate side, and a heat storage medium inlet and a heat storage medium outlet on the heat storage medium side. The condensate inlet and outlet form a pipeline within the second heat exchanger 310 for the flow of condensate, and the heat storage medium inlet and outlet form a pipeline within the second heat exchanger 310 for the flow of high-temperature heat storage medium. The heat storage medium inlet of the second heat exchanger 310 is connected to the heat storage medium outlet of the high-temperature tank 120, the heat storage medium outlet of the second heat exchanger 310 is connected to the heat storage medium inlet of the low-temperature tank 110, the condensate inlet of the second heat exchanger 310 is connected to the condensate outlet of the condenser, and the condensate outlet of the second heat exchanger 310 is connected to the booster pump.

[0104] Based on this embodiment, the heat exchange process of the second heat exchanger 310 is described as follows:

[0105] During peak grid hours, condensate discharged from the condenser flows to the condensate inlet of the second heat exchanger 310. The high-temperature heat storage medium in the high-temperature tank 120 flows to the second heat exchanger 310 under the drive of the circulating pump 130, entering the second heat exchanger 310 through its heat storage medium inlet. At this time, within the second heat exchanger 310, condensate flows from its condensate inlet to its condensate outlet, while the high-temperature heat storage medium flows from its inlet to its outlet. During this process, the condensate is heated by the high-temperature heat storage medium, and the high-temperature heat storage medium releases heat energy to become a low-temperature heat storage medium, thus achieving heat exchange. After the heat exchange is completed, the low-temperature heat storage medium flows from the heat storage medium output end of the second heat exchanger 310 to the low-temperature tank 110 and is stored in the low-temperature tank 110, while the condensate with increased temperature flows to the booster pump and is used as boiler feedwater under the drive of the booster pump.

[0106] Through the above embodiments, in order to increase the boiler output by increasing the boiler feedwater temperature, it can be understood that since the second heat exchanger 310 actually heats the condensate, the temperature requirement for the heat storage medium is relatively low. Therefore, by setting the heat release path described in the above embodiments, the potentially wasted medium and low grade heat energy is efficiently utilized, and efficient utilization of heat storage is achieved.

[0107] In one embodiment, the control component 500 is configured as follows:

[0108] When the grid load is less than the first load threshold, it is determined that it is a grid off-peak period. During the grid off-peak period, the opening degree of the first regulating valve 142 is controlled to the preset opening degree, the opening degree of the second regulating valve 143 is controlled to the maximum value, the opening degree of the third regulating valve 145 and the fourth regulating valve 146 is controlled to zero, and the circulation pump 130 is controlled to work.

[0109] Specifically, the control component 500 is connected to the power grid, detects the grid load, and determines the relationship between the grid load and a first load threshold. When the grid load is less than the first load threshold, it is determined that the current period is a grid off-peak period. As an example, the first load threshold can be set to 70% of the rated power of the coal-fired power unit.

[0110] After the control component 500 determines that the current period is a low-voltage period in the power grid, the control component 500 controls the energy storage and peak-shaving device to store energy. At this time, the control component 500 opens the first regulating valve 142 connecting the steam pipeline of the main steam turbine and the first heat exchanger 141, setting its opening to a preset value, thereby extracting a specific proportion of steam. The control component 500 controls the opening of the second regulating valve 143 connecting the steam output end of the first heat exchanger 141 and the steam pipeline of the main steam turbine to its maximum value or a large preset value, ensuring that the steam after heat exchange can smoothly return to the main steam turbine to continue performing work.

[0111] At the same time, the control component 500 also starts the circulation pump 130 in the energy storage component 100 to pump the low-temperature heat storage medium in the low-temperature tank 110 into the first heat exchanger 141 to exchange heat with steam. The heated high-temperature heat storage medium is then sent to the high-temperature tank 120 for storage.

[0112] On the other hand, in order to concentrate the steam energy for heating the heat storage medium, the control assembly 500 controls the opening of the third regulating valve 145, which connects the first heat exchanger 141 to the deaerator, and the fourth regulating valve 146, which connects to the high-pressure heater, to zero, completely closing these two channels.

[0113] Through the above embodiments, the control component 500 coordinates the control of the first regulating valve 142, the second regulating valve 143, and the circulating pump 130 to ensure that the excess heat energy of the coal-fired power unit can be stably and efficiently converted into the internal energy of the heat storage medium during off-peak periods of the power grid.

[0114] In one embodiment, the control component 500 is configured as follows:

[0115] When the grid load is greater than the second load threshold, it is determined that it is in the peak period of the grid. During the peak period of the grid, the medium temperature of the heat storage medium in the high temperature tank 120 is obtained. When the medium temperature is greater than or equal to the temperature threshold, the first energy release component 200 is controlled to work, the second energy release component 300 is controlled to not work, and the circulation pump 130 is controlled to drive the heat storage medium in the high temperature tank 120 to flow to the first energy release component 200.

[0116] Specifically, the control component 500 is connected to the power grid, detects the grid load, and determines the relationship between the grid load and a second load threshold. When the grid load is greater than or equal to the second load threshold, it is determined that the current period is a peak period for the power grid. As an example, the second load threshold can be set to 90% of the rated power of the coal-fired power unit.

[0117] When the control component 500 determines that it is during a peak power grid period, it acquires the temperature of the heat storage medium inside the high-temperature tank 120. In one embodiment, the control component 500 can acquire the temperature of the heat storage medium inside the high-temperature tank 120 through a sensing device installed inside the high-temperature tank 120. The control component 500 compares the temperature of the heat storage medium inside the high-temperature tank 120 with a temperature threshold. If the medium temperature is greater than or equal to the temperature threshold, it is considered that the thermodynamic quality of the heat storage medium inside the high-temperature tank 120 is good, and that the heat storage medium stores a large amount of energy. In one embodiment, the temperature threshold can be set to 500°C.

[0118] When the medium temperature is greater than or equal to a temperature threshold, the control component 500 sends a working command to the first energy-releasing component 200, which may include a steam generator 210. The steam generator 210 is started and put into operation to prepare for steam generation. The control component 500 controls the first energy-releasing component 200 to operate. At the same time, the control component 500 sends a stop command to the second energy-releasing component 300, controlling the second energy-releasing component 300 to stop operating, so as to ensure that all the energy in the thermal storage medium is used for additional power generation. The second energy-releasing component 300 may include a second heat exchanger 310, which is currently controlled by the control component 500 to stop operating. The control component 500 starts the circulation pump 130, which pumps the high-temperature heat storage medium in the high-temperature tank 120 to the heat storage medium input end of the steam generator 210 in the first energy release component 200. The high-temperature heat storage medium releases heat in the steam generator 210 to generate high-temperature and high-pressure steam, which drives the auxiliary steam turbine 220 to generate electricity, thereby outputting additional power to the grid. The cooled heat storage medium flows out of the steam generator 210 in the first energy release component 200 and returns to the low-temperature tank 110.

[0119] The above embodiments ensure that high-quality thermal energy is prioritized for direct power generation, thereby maximizing the value of energy.

[0120] In one embodiment, the control component 500 can also be configured to combine historical grid load predictions to determine whether a future preset time falls within a grid off-peak period. If the preset time does fall within a grid off-peak period, the control action described in the above embodiment is executed in advance. This embodiment ensures that the energy storage peak-shaving system can achieve energy storage in a timely manner.

[0121] In one embodiment, the control component 500 is configured as follows:

[0122] When the grid load is greater than the second load threshold, it is determined that it is in the peak period of the grid. During the peak period of the grid, the medium temperature of the heat storage medium in the high temperature tank 120 is obtained. When the medium temperature is less than the temperature threshold, the first energy release component 200 is controlled to not work, the second energy release component 300 is controlled to work, and the circulating pump 130 is controlled to drive the heat storage medium in the high temperature tank 120 to flow to the second energy release component 300.

[0123] Specifically, the control component 500 is connected to the power grid, detects the grid load, and determines the relationship between the grid load and a second load threshold. When the grid load is greater than or equal to the second load threshold, it is determined that the current period is a peak period for the power grid. As an example, the second load threshold can be set to 90% of the rated power of the coal-fired power unit.

[0124] When the control component 500 determines that it is during a peak power grid period, it acquires the temperature of the heat storage medium inside the high-temperature tank 120. In one embodiment, the control component 500 can acquire the temperature of the heat storage medium inside the high-temperature tank 120 through a sensing device installed inside the high-temperature tank 120. The control component 500 compares the temperature of the heat storage medium inside the high-temperature tank 120 with a temperature threshold. If the medium temperature is lower than the temperature threshold, it is considered that the thermodynamic quality of the heat storage medium inside the high-temperature tank 120 is poor, and the energy stored in the heat storage medium is insufficient.

[0125] When the medium temperature is below a temperature threshold, the control component 500 sends a working command to the second energy-releasing component 300, which may include a second heat exchanger 310. The second heat exchanger 310 is started and enters the operating state, and the control component 500 controls the second energy-releasing component 300 to operate. Simultaneously, the control component 500 sends a stop command to the first energy-releasing component 200, controlling it to stop operating to avoid inefficient power generation. The first energy-releasing component 200 may include a steam generator 210, and the control component 500 currently controls the steam generator 210 to stop operating. The control component 500 starts the circulation pump 130, which pumps the high-temperature heat storage medium in the high-temperature tank 120 to the heat storage medium input end of the second heat exchanger 310 in the second energy release component 300. The high-temperature heat storage medium releases heat in the second heat exchanger 310 in the second energy release component 300 to heat the condensate from the condenser. The heated condensate is then pumped to the boiler by a booster pump to increase the boiler feedwater temperature. The low-temperature heat storage medium after heat exchange is returned to the low-temperature tank 110 from the heat storage medium output end of the second heat exchanger 310 in the second energy release component 300.

[0126] Through the above embodiments, it is ensured that low- to medium-quality thermal energy is not wasted, but is recovered and utilized through the most efficient means, thus achieving full utilization of thermal storage.

[0127] In one embodiment, the control component 500 is configured as follows:

[0128] When the grid load is greater than or equal to the first load threshold but less than or equal to the second load threshold, it is determined that the grid is in a period of off-peak load. During the period of off-peak load, the opening degree of the first regulating valve 142, the second regulating valve 143, the third regulating valve 145 and the fourth regulating valve 146 are all controlled to be zero.

[0129] In one embodiment, the control component 500 can also be configured to combine historical grid load predictions to determine whether a future preset time falls within a grid off-peak period. If the preset time does fall within a grid off-peak period, the control action described in the above embodiment is executed in advance. This embodiment ensures that the energy storage peak-shaving system can achieve energy storage in a timely manner.

[0130] In one embodiment, refer to Figure 4A coal-fired power unit is provided, which includes the energy storage and peak-shaving device described in any of the above embodiments.

[0131] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0132] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An energy storage and peak-shaving device, wherein the peak-shaving device is installed in a coal-fired power unit, the coal-fired power unit comprising a boiler, a main steam turbine, a booster pump, and a condenser, the main steam turbine being used to supply power to the power grid, characterized in that, The energy storage and peak-shaving device includes: An energy storage component is connected to the main steam turbine. The energy storage component contains a heat storage medium. The energy storage component is used to enable heat exchange between the heat storage medium and part of the steam in the main steam turbine, so that the heat storage medium stores thermal energy. The first energy-releasing component is connected to the energy storage component and is used to convert the thermal energy stored in the thermal storage medium into electrical energy for output to the power grid. The second energy release component is disposed between the booster pump and the condenser and is connected to the energy storage component, and is used to reheat the condensate discharged from the condenser using the heat energy stored in the heat storage medium. A detection component is disposed within the energy storage component and is used to detect the temperature of the thermal storage medium within the energy storage component. A control component is connected to the power grid, the detection component, the first energy release component, and the second energy release component, respectively, for controlling the energy storage component to store thermal energy during off-peak hours of the power grid, and for controlling the first energy release component or the second energy release component to release the thermal energy stored in the energy storage component during peak hours of the power grid according to the medium temperature.

2. The energy storage and peak-shaving device according to claim 1, characterized in that, The energy storage component includes: A cryogenic tank is used to store the heat storage medium after the heat energy has been released; A high-temperature tank is used to store the heat storage medium after heat energy storage; A circulating pump is installed inside the low-temperature tank and the high-temperature tank and connected to the control component to drive the flow of the heat storage medium inside the low-temperature tank and the high-temperature tank; The heat exchange pipeline is connected to the cryogenic tank, the high-temperature tank, and the main steam turbine, respectively, for enabling heat exchange between the heat storage medium in the high-temperature tank and / or the cryogenic tank and a portion of the steam in the main steam turbine.

3. The energy storage and peak-shaving device according to claim 2, characterized in that, The heat exchange pipeline includes: The first heat exchanger has its steam inlet and steam outlet connected to the steam pipeline inside the main steam turbine, its heat storage medium inlet connected to the heat storage medium outlet of the low-temperature tank, and its heat storage medium outlet connected to the heat storage medium inlet of the high-temperature tank; wherein, the first heat exchanger is used to enable heat exchange between a portion of the steam inside the main steam turbine and the heat storage medium. A first regulating valve is disposed between the steam inlet of the first heat exchanger and the steam pipeline inside the main steam turbine, and is connected to the control component; wherein, the first regulating valve is used to adjust its own opening degree according to the control of the control component; The second regulating valve is located between the steam output end of the first heat exchanger and the steam pipeline inside the main steam turbine, and is connected to the control component; wherein, the second regulating valve is used to adjust its own opening degree according to the control of the control component.

4. The energy storage and peak-shaving device according to claim 3, wherein the coal-fired power unit further includes a deaerator and a high-pressure heater, characterized in that, The steam output end of the first heat exchanger is also connected to the deaerator and the high-pressure heater, and the heat exchange pipeline further includes: A third regulating valve is disposed between the steam output end of the first heat exchanger and the deaerator, and is connected to the control component; wherein, the third regulating valve is used to adjust its own opening degree according to the control of the control component; A fourth regulating valve is disposed between the steam output end of the first heat exchanger and the high-pressure heater, and is connected to the control component; wherein, the fourth regulating valve is used to adjust its own opening degree according to the control of the control component.

5. The energy storage and peak-shaving device according to claim 2, characterized in that, The first energy-releasing component includes: A steam generator, the input end of which is connected to the heat storage medium output end of the high-temperature tank, and the output end of which is connected to the heat storage medium input end of the low-temperature tank, the steam generator is also connected to the control component; wherein, the steam generator is used to generate steam based on the thermal energy stored in the heat storage medium; An auxiliary steam turbine is connected to the steam output terminal of the steam generator and is used to supply power to the power grid under the drive of the steam generated by the steam generator.

6. The energy storage and peak-shaving device according to claim 2, characterized in that, The second energy-releasing component includes: The second heat exchanger has its heat storage medium input end connected to the heat storage medium output end of the high-temperature tank, its heat storage medium output end connected to the heat storage medium input end of the low-temperature tank, its condensate input end connected to the condensate output end of the condenser, and its condensate output end connected to the booster pump. The second heat exchanger is also connected to the control component. The second heat exchanger is used to enable heat exchange between the heat storage medium and the condensate discharged from the condenser.

7. The energy storage and peak-shaving device according to claim 4, characterized in that, The control component is configured as follows: When the grid load is less than the first load threshold, it is determined that the grid is in a low period. During the low period, the opening of the first regulating valve is controlled to a preset opening, the opening of the second regulating valve is controlled to the maximum value, the opening of the third regulating valve and the fourth regulating valve is controlled to zero, and the circulating pump is controlled to work.

8. The energy storage and peak-shaving device according to claim 5 or 6, characterized in that, The control component is configured as follows: When the grid load is greater than the second load threshold, it is determined that the grid is in a peak period. During the peak period, the temperature of the heat storage medium in the high-temperature tank is obtained. When the medium temperature is greater than or equal to the temperature threshold, the first energy release component is controlled to work, the second energy release component is controlled to not work, and the circulation pump is controlled to drive the heat storage medium in the high-temperature tank to flow to the first energy release component.

9. The energy storage and peak-shaving device according to claim 8, characterized in that, The control component is configured as follows: When the grid load is greater than the second load threshold, it is determined that the grid is in a peak period. During the peak period, the temperature of the heat storage medium in the high-temperature tank is obtained. When the medium temperature is less than the temperature threshold, the first energy release component is controlled to not work, the second energy release component is controlled to work, and the circulation pump is controlled to drive the heat storage medium in the high-temperature tank to flow to the second energy release component.

10. A coal-fired power unit, characterized in that, Includes the energy storage and peak-shaving device as described in any one of claims 1-9.

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