Heating devices, energy storage systems and their control methods

Abstract

This invention relates to a heating device, an energy storage system, and a control method thereof. The heating device is applied to an energy storage system, which includes a turbine and an energy release heat exchanger. The heating device includes: a heat exchange module comprising a shell side for hot fluid flow and a tube side for gaseous carbon dioxide flow, wherein the inlet of the tube side is connected to the outlet of the energy release heat exchanger, and the outlet is connected to the turbine inlet; and a heating module, which is connected in a closed loop to the shell side and cooperates to form a heating loop to drive the hot fluid to flow within the heating loop, providing hot fluid with a temperature higher than that of the gaseous carbon dioxide in the tube side. The heating device starts working before the turbine starts up, and the hot fluid in the shell side exchanges heat with the gaseous carbon dioxide in the tube side, so that the temperature of the gaseous carbon dioxide in the tube side rises to the turbine start-up allowable temperature, and the turbine is in the allowable start-up state. At this time, the gaseous carbon dioxide entering the turbine will not cause the turbine blades to become brittle, ensuring the safe, reliable, and stable operation of the turbine.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a heating device, an energy storage system and a control method thereof. Background Technology

[0002] Utilizing clean energy sources such as solar and wind power to mitigate the consumption of non-renewable traditional energy sources such as coal and oil has become an inevitable choice. Due to the intermittent, fluctuating, and off-peak power generation characteristics of clean energy, energy storage technology has become one of the key technologies for the development of clean energy.

[0003] Currently, energy storage technology based on carbon dioxide gas-liquid phase change cycle (CO2-LCC) compresses and condenses gaseous carbon dioxide at room temperature and pressure into liquid carbon dioxide during off-peak hours using surplus electricity or clean energy sources. The heat generated during compression is stored, and during peak hours, this stored heat is used to reheat the liquid carbon dioxide back to a gaseous state. The gaseous carbon dioxide then drives a turbine to power a generator. The used gaseous carbon dioxide is then returned to the storage tank for reuse. This technology has attracted widespread attention due to its simple structure, flexible layout, and high energy storage efficiency. However, after the turbine finishes operation, the temperature of the gaseous carbon dioxide in the intake pipe decreases over time, resulting in low-temperature gaseous carbon dioxide in the intake pipe. When the turbine starts up, the gaseous carbon dioxide directly enters the turbine and expands, further cooling it. This low temperature causes the turbine blades to become brittle, endangering the turbine's operational safety and even affecting the reliability, stability, and service life of the entire energy storage system.

[0004] Therefore, providing a heating device, energy storage system, and control method that can warm up the pipes before turbine startup is an urgent technical problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide a heating device, an energy storage system, and a control method for the above-mentioned technical problems. The heating device warms up the pipes before the turbine starts up, ensuring that the gaseous carbon dioxide at the turbine inlet meets the start-up temperature, thus ensuring the safe operation of the turbine and the energy storage system.

[0006] This invention provides a heating device for use in an energy storage system, the energy storage system including a turbine and an energy-releasing heat exchanger, the heating device comprising:

[0007] A heat exchange module includes a shell side for the flow of hot fluid and a tube side for the flow of gaseous carbon dioxide, wherein the inlet of the tube side is connected to the outlet of the energy-releasing heat exchanger of the turbine, and the outlet is connected to the inlet of the turbine.

[0008] A heating module is connected in a closed loop to the shell side and cooperates to form a heating loop to drive the hot fluid to circulate in the heating loop, for providing the hot fluid at a temperature higher than that of gaseous carbon dioxide in the tube side.

[0009] The aforementioned heating device starts working before the turbine starts. The heating module drives the hot fluid to circulate in the heating loop. The hot fluid in the shell side exchanges heat with the gaseous carbon dioxide in the tube side, so that the temperature of the gaseous carbon dioxide in the tube side rises. As the hot fluid continues to circulate in the heating loop, the gaseous carbon dioxide in the tube side heats up to the turbine start-up allowable temperature. At this time, the turbine is in the start-up allowable state. At this time, the gaseous carbon dioxide entering the turbine will not cause the turbine blades to become brittle, which can ensure the safe, reliable and stable operation of the turbine.

[0010] In one embodiment, the heat exchange module includes a heat exchange component, which includes an inner tube and an outer tube. The inner tube is inserted into the outer tube and is sealed and connected to the outer tube as a whole. The inner tube is connected to the outlet of the energy release heat exchanger and the inlet of the turbine. The outer tube is connected to the heating module. When there is only one heat exchange component, the inner cavity of the inner tube forms the tube side, and the cavity between the outer tube and the inner tube forms the shell side.

[0011] In one embodiment, the number of heat exchange components is multiple, the multiple inner tubes are connected in series through at least one heat exchange joint to form the tube side, the adjacent openings of adjacent outer tubes are connected by connecting pipes, and the multiple outer tubes, multiple inner tubes and the connecting pipes cooperate to form the shell side.

[0012] In one embodiment, the heating module includes a heat storage tank, a pressure pump, and a heating pipeline. The heat storage tank, the pressure pump, and the shell side are connected in a closed loop through the heating pipeline to form the heating loop. The heat storage tank is used to store the hot fluid, and the pressure pump is used to provide the driving force for the flow of the hot fluid.

[0013] In one embodiment, the heating device further includes a monitoring module, which includes a temperature acquisition element and a control component. The temperature acquisition element is disposed at the end of the tube near the turbine inlet and is used to acquire temperature data of gaseous carbon dioxide at the turbine inlet. The control component is communicatively connected to the temperature acquisition element, the pressure pump, and the turbine and is used to control the operation of the pressure pump and the turbine based on the acquired temperature data.

[0014] In one embodiment, the heat fluid is one of hot oil, pressurized hot water, or molten salt.

[0015] In addition, the present invention also provides an energy storage system, including a closed-loop connected energy storage tank, an energy release heat exchanger, a turbine, and a gas storage tank. The energy storage tank is used to store liquid carbon dioxide. The energy storage system also includes a heating device as described in any of the above technical solutions. The inlet of the tube side of the heating device is connected to the outlet of the energy release heat exchanger, and the outlet is connected to the inlet of the turbine.

[0016] In the aforementioned energy storage system, during energy release, the medium-pressure (2MPa-10MPa) liquid carbon dioxide in the energy storage tank is converted into medium-pressure gaseous carbon dioxide through the energy release heat exchange component and heated to high-temperature gaseous carbon dioxide to drive the turbine for power generation. The gaseous carbon dioxide after work is returned to the gas storage tank for recycling. After the turbine finishes operation, medium-pressure, low-temperature gaseous carbon dioxide remains in the tube side. The heating device starts working before the turbine starts up. The heating module drives the hot fluid to circulate in the heating loop. The hot fluid in the shell side exchanges heat with the gaseous carbon dioxide in the tube side, causing the temperature of the gaseous carbon dioxide in the tube side to rise. As the hot fluid continues to circulate in the heating loop, the gaseous carbon dioxide in the tube side heats up to the turbine start-up allowable temperature. At this time, the turbine is in the allowable start-up state. After the turbine starts up, the gaseous carbon dioxide entering the turbine at a high temperature will not cause the turbine blades to become brittle, which can ensure the safe, reliable and stable operation of the turbine, thereby ensuring the safety, reliability, stability and service life of the energy storage system.

[0017] In one embodiment, the energy storage system further includes a compression device connected to the energy storage tank, the compression device being used to compress and condense gaseous carbon dioxide into liquid carbon dioxide, and the heat of the heat fluid in the heating device coming from the heat of compression generated by the compression device during the energy storage process.

[0018] In addition, the present invention also provides a control method for an energy storage system as described in any of the above technical solutions, comprising the following steps:

[0019] Step S701: Before the turbine starts up, the heating module drives the hot fluid to circulate in the heating loop.

[0020] Step S702: The gaseous carbon dioxide in the tube exchanges heat with the hot fluid;

[0021] In step S703, the gaseous carbon dioxide in the tube is heated to a set temperature, which is the turbine start-up allowable temperature.

[0022] In the control method of the above-mentioned energy storage system, firstly, in step S701, the heating device starts working before the turbine starts. The heating module drives the hot fluid to circulate in the heating loop. The temperature of the hot fluid is much higher than the temperature of the gaseous carbon dioxide in the tube, at which point a temperature difference is formed between the hot fluid and the gaseous carbon dioxide. Then, in step S702, the gaseous carbon dioxide in the tube exchanges heat with the hot fluid, causing the temperature of the gaseous carbon dioxide in the tube to rise. As the hot fluid continues to circulate in the heating loop, the temperature of the gaseous carbon dioxide in the tube continues to rise. Finally, in step S703, the gaseous carbon dioxide in the tube rises to a set temperature, which is the turbine start-up allowable temperature. At this point, the turbine is in a start-up allowable state. The turbine starts, and the gaseous carbon dioxide enters the turbine. Since the temperature of the gaseous carbon dioxide is high at this time, the entry of the gaseous carbon dioxide will not affect the turbine blades. The control method of the above-mentioned energy storage system has simple logic, is easy to implement, and can achieve the operation of the energy storage system safely, reliably, and stably.

[0023] In one embodiment, the control method of the energy storage system is used to control the heating device as described in the above technical solution. The heating device further includes a monitoring module. Correspondingly, step S701 in the control method of the energy storage system specifically includes the following steps:

[0024] Before the turbine starts up, the temperature acquisition element collects and transmits the temperature data of gaseous carbon dioxide at the turbine inlet;

[0025] The control unit compares the received temperature data with the turbine start-up allowable temperature. When the temperature data is lower than the turbine start-up allowable temperature, the pressure pump works and the heating module drives the hot fluid to circulate in the heating loop. When the temperature data is higher than the turbine start-up allowable temperature, the turbine starts and the pressure pump stops working. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the energy storage system in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the heat exchange module in one embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the heating device in one embodiment of the present invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure of the module consisting of the heating device, turbine, and energy-releasing heat exchanger;

[0030] Figure 5 This is a schematic diagram of the heating device in another embodiment of the present invention;

[0031] Figure 6 for Figure 5 A schematic diagram of the structure of the module consisting of the heating device, turbine, and energy-releasing heat exchanger;

[0032] Figure 7 This is a flowchart of a control method for an energy storage system according to an embodiment of the present invention.

[0033] Figure label:

[0034] 01. Energy storage system;

[0035] 10. Heating device;

[0036] 100. Heat exchange module; 110. Shell side; 120. Tube side; 130. Heat exchange assembly; 131. Inner tube; 132. Tube sheet flange; 133. Outer tube; 140. Heat exchange joint; 150. Connecting pipe; 160. Heating joint;

[0037] 200. Heating module; 210. Thermal storage tank; 220. Pressure pump; 230. Heating pipeline;

[0038] 20. Turbine;

[0039] 30. Energy release heat exchanger;

[0040] 40. Energy storage tank;

[0041] 50. Gas storage facility. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] The technical solutions provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

[0049] like Figure 1As shown, the present invention provides a heating device 10, which is applied to an energy storage system 01. The energy storage system 01 includes at least a turbine 20 and an energy release heat exchanger 30. The heating device 10 is used to heat the turbine 20 before it is started, so that the gaseous carbon dioxide entering the turbine 20 has a high temperature, thus preventing the turbine blades from becoming brittle. The heating device 10 includes a heat exchange module 100 and a heating module 200, which are connected to each other, wherein:

[0050] like Figure 2 , Figure 3 , Figure 4 As shown, the heat exchange module 100 includes a shell side 110 and a tube side 120. The inlet of the tube side 120 is connected to the outlet of the energy release heat exchanger 30, and the outlet of the tube side 120 is connected to the inlet of the turbine 20. The shell side 110 is used for the flow of hot fluid, and the tube side 120 is used for the flow of gaseous carbon dioxide. After the heating device 10 is connected between the turbine 20 and the energy release heat exchanger 30, the gaseous carbon dioxide enters the turbine 20 through the outlet of the energy release heat exchanger 30, the tube side 120, and the inlet of the turbine 20 in sequence, so that the introduction of the heating device 10 will not adversely affect the original gaseous carbon dioxide flow path of the turbine 20.

[0051] The heat exchange module 100 has various structural forms. In a preferred embodiment, such as... Figure 2 , Figure 3 , Figure 4 As shown, the heat exchange module 100 includes a heat exchange assembly 130, which includes an inner tube 131, an outer tube 133, and a tube sheet flange 132. The inner tube 131 is inserted into the outer tube 133, and the inner tube 131 is sealed to the outer tube 133 through the tube sheet flange 132. The inner tube 131 is connected to the outlet of the energy release heat exchanger 30 and the inlet of the turbine 20, and the outer tube 133 is connected to the heating module 200. In a specific configuration, the tube sheet flange 132 and the two ends of the inner tube 131 and the outer tube 133 are fixedly connected by means of threaded connection, snap connection, anti-convex and concave fit, welding, etc., and the tube sheet flange 132 and the inner tube 131 and the outer tube 133 are sealed together by a sealing structure, which can be one or a combination of gaskets, sealing rings, oil seals, etc. Of course, the structure of the heat exchange component 130 is not limited to this, and can also be other forms that meet the requirements. For example, the heat exchange component 130 can be an injection-molded structure with a tube side 120 and a shell side 110.

[0052] like Figure 2 , Figure 3 , Figure 4As shown, the number of heat exchange components 130 can be one set. In this case, the inner cavity of the inner tube 131 constitutes the tube side 120, and the cavity between the outer tube 133 and the inner tube 131 constitutes the shell side 110. Of course, to improve the applicability of the heating device 10, the number of heat exchange components 130 can be multiple sets. Specifically, as shown... Figure 5 as well as Figure 6 As shown, in multiple heat exchange components 130, multiple inner tubes 131 are connected in series through at least one heat exchange joint 140 to form a tube side 120. The adjacent openings of adjacent outer tubes 133 are connected by a connecting pipe 150. Multiple outer tubes 133, multiple inner tubes 131, and the connecting pipe 150 cooperate to form a shell side 110. For example, if there are two heat exchange components 130, then there is one heat exchange joint 140 and one connecting pipe 150. The two inner tubes 131 and one heat exchange joint 140 are connected in series to form a shell side 110. For example, if there are three heat exchange components 130, then there are two heat exchange joints 140 and two connecting pipes 150. In this case, the heat exchange joints 140 are connected in series between each pair of inner tubes 131 to form the tube side 120. Similarly, the heat exchange joints 140 are connected between each pair of outer tubes 133 to form the shell side 110. In specific configurations, the inner tubes 131 and heat exchange joints 140, and the outer tubes 133 and connecting pipes 150 are sealed together using gaskets, sealing rings, oil seals, etc. Both heat exchange joints 140 and connecting pipes 150 can be flanges or welded bodies. The structures of heat exchange joints 140 and connecting pipes 150 can be the same or different, and they can also be other structural forms that meet the connection requirements.

[0053] Please refer to the above. Figure 1 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 The heating module 200 is connected in a closed loop to the shell side 110, and the heating module 200 and the shell side 110 cooperate to form a heating loop. The heating module 200 is used to provide hot fluid and drive the hot fluid to circulate within the heating loop. The temperature of the hot fluid is higher than the temperature of gaseous carbon dioxide in the tube side 120. In a preferred embodiment, the hot fluid can be one of hot oil, pressurized hot water, or molten salt. Hot fluids formed by hot oil, pressurized hot water, or molten salt can have a high temperature, for example, above 100°C, and high fluidity, allowing them to circulate within the heating loop. Of course, the hot fluid is not limited to these and can also be other forms with the above functions. Of course, for special turbine start-up conditions, the hot fluid can also be hot water with a temperature below 100°C.

[0054] The heating module 200 has various structural forms. In a preferred embodiment, such as... Figure 3 , Figure 4 , Figure 5 as well as Figure 6 As shown, the heating module 200 includes a heat storage tank 210, a pressure pump 220, and a heating pipe 230. The heat storage tank 210, pressure pump 220, and shell side 110 are connected in a closed loop through the heating pipe 230, and the heat storage tank 210, pressure pump 220, shell side 110, and heating pipe 230 cooperate to form a heating loop. The heat storage tank 210 is used to store hot fluid, and the pressure pump 220 is used to provide the driving force for the flow of hot fluid. In a specific configuration, the heat storage tank 210 and the heating pipe 230, the pressure pump 220 and the heating pipe 230, and the shell side 110 and the heating pipe 230 are sealed together using gaskets, sealing rings, oil seals, etc. During operation, the pressure pump 220 operates to drive the hot fluid within the heat storage tank 210. The hot fluid flows from the heat storage tank 210 towards the shell side 110 and then back towards the heat storage tank 210 within the heating loop, exchanging heat with the gaseous carbon dioxide within the tube side 120. To further improve the heat exchange effect, the outlet of the heat storage tank 210 is close to the inlet of the shell side 110 and the inlet of the tube side 120, and the heat storage tank 210 and pressure pump 220 are arranged along the tube side 120 from the inlet to the outlet. It is noteworthy that the inner tube 131 is connected to the outlet of the energy release heat exchanger 30 and the inlet of the turbine 20 via a heating joint 160. Similarly, the outer tube 133 is connected to the heating pipe 230 and the connecting pipe 150 via a heating joint 160. The heating joint 160 can be a flange, a welded body, or other structural forms that meet the connection requirements.

[0055] To improve heating accuracy, the heating device 10 further includes a monitoring module. This module comprises a temperature acquisition element and a control component. The temperature acquisition element is located at the end of the tube 120 near the inlet of the turbine 20. It collects temperature data of the gaseous carbon dioxide at the turbine 20 inlet. The control component is connected to the temperature acquisition element, the pressure pump 220, and the turbine 20 via cables. The control component controls the operation of the pressure pump 220 and the turbine 20 based on the obtained temperature data. Specifically, the temperature acquisition element can be a temperature sensor, thermocouple, resistance temperature detector (RTD), or other suitable form. The control component can be a PLC, control panel, or other suitable form. Before the turbine 20 starts, the temperature acquisition element accurately collects the temperature data of the gaseous carbon dioxide at the turbine 20 inlet. The control component then precisely controls the opening and closing of the pressure pump 220 and whether the turbine 20 starts based on this temperature data.

[0056] The aforementioned heating device 10 starts working before the turbine 20 is started. The heating module 200 drives the hot fluid to circulate in the heating loop. The hot fluid in the shell side 110 exchanges heat with the gaseous carbon dioxide in the tube side 120, so that the temperature of the gaseous carbon dioxide in the tube side 120 rises. As the hot fluid continues to circulate in the heating loop, the gaseous carbon dioxide in the tube side 120 heats up to the turbine 20 start-up allowable temperature. At this time, the turbine 20 is in the start-up allowable state, and the gaseous carbon dioxide entering the turbine 20 at this time will not cause the turbine blades to become brittle, thus ensuring the safe, reliable and stable operation of the turbine 20.

[0057] In addition, such as Figure 1 As shown, the present invention also provides an energy storage system 01, which stores energy based on a carbon dioxide gas-liquid phase change cycle. The energy storage system 01 includes an energy storage tank 40, an energy release heat exchanger 30, a turbine 20, and a gas storage tank 50. The energy storage tank 40, the energy release heat exchanger 30, the turbine 20, and the gas storage tank 50 are connected in a closed loop. The energy storage tank 40 is used to store liquid carbon dioxide, and the energy release heat exchanger 30 is used to heat gaseous carbon dioxide. The energy storage system 01 also includes a heating device 10 as described in any of the above technical solutions. The inlet of the energy release heat exchanger 30 is connected to the energy storage tank 40, and the outlet is connected to the inlet of the tube side 120 in the heating device 10. The outlet of the tube side 120 is connected to the inlet of the turbine 20, and the outlet of the turbine 20 is connected to the gas storage tank 50.

[0058] To improve the energy utilization of the energy storage system 01, in a preferred embodiment, the energy storage system 01 further includes a compression device connected to the energy storage tank 40. The compression device is used to compress and condense gaseous carbon dioxide into liquid carbon dioxide. The heat of the hot fluid in the heating device 10 comes from the heat of compression generated by the compression device during the energy storage process. In a specific configuration, the compression device generates heat of compression during the process of compressing and condensing gaseous carbon dioxide into liquid carbon dioxide. This heat of compression can be used to heat the fluid in the heating device 10 to form a hot fluid flowing in the heating loop. Through this heat exchange, the energy utilization of the energy storage system 01 can be improved. Of course, the heat source of the hot fluid is not limited to this and can also be other forms that meet the requirements, such as photovoltaic heating.

[0059] In the aforementioned energy storage system 01, the medium-pressure, low-temperature liquid carbon dioxide in the energy storage tank 40 evaporates and heats up into medium-pressure, high-temperature gaseous carbon dioxide through the heat exchanger 30. During peak electricity consumption periods, this gaseous carbon dioxide drives the turbine 20 to generate electricity. After the work is done, the gaseous carbon dioxide returns to the gas storage tank 50 for recycling. After the turbine 20 finishes operating, medium-pressure, low-temperature gaseous carbon dioxide remains in the tube side 120. The heating device 10 starts working before the turbine 20 starts, and the heating module 200 drives the heat fluid to circulate in the heating loop. The heat fluid in the shell side 110 and the gaseous carbon dioxide in the tube side 120... Carbon dioxide undergoes heat exchange, raising the temperature of the gaseous carbon dioxide within tube 120. As the hot fluid continues to flow in the heating loop, the gaseous carbon dioxide within tube 120 heats up to the allowable start-up temperature of turbine 20. At this point, turbine 20 is in a state where it is allowed to start up. Furthermore, after turbine 20 starts up, the gaseous carbon dioxide entering turbine 20 at a high temperature will not cause the turbine blades to become brittle, ensuring the safe, reliable, and stable operation of turbine 20. This, in turn, ensures the safety, reliability, stability, and service life of energy storage system 01.

[0060] In addition, such as Figure 7 As shown, the present invention also provides a control method for an energy storage system 01 as described in any of the above technical solutions, comprising the following steps:

[0061] In step S701, before turbine 20 starts, heating module 200 is activated to drive hot fluid to circulate in the heating loop; in specific settings, step S701 is executed before turbine 20 starts, if the temperature at the inlet of turbine 20 is lower than the allowable temperature for turbine 20 to start.

[0062] In step S702, the gaseous carbon dioxide in the tube 120 exchanges heat with the hot fluid; in a specific setting, the gaseous carbon dioxide in the tube 120 exchanges heat with the hot fluid so that the temperature of the gaseous carbon dioxide in the tube 120 continuously increases.

[0063] In step S703, the gaseous carbon dioxide in tube 120 is heated to the set temperature; in specific settings, this set temperature is the turbine 20 start-up allowable temperature.

[0064] In the control method of the aforementioned energy storage system 01, firstly, in step S701, the heating device 10 starts working before the turbine 20 starts. The heating module 200 drives the hot fluid to circulate in the heating loop. The temperature of the hot fluid is much higher than the temperature of the gaseous carbon dioxide in the tube side 120, at which point a temperature difference is formed between the hot fluid and the gaseous carbon dioxide. Then, in step S702, the gaseous carbon dioxide in the tube side 120 exchanges heat with the hot fluid, causing the temperature of the gaseous carbon dioxide in the tube side 120 to rise. As the hot fluid continues to circulate in the heating loop, the temperature of the gaseous carbon dioxide in the tube side 120 also rises. The carbon dioxide continues to heat up; finally, through step S703, the gaseous carbon dioxide in tube 120 is heated to a set temperature, which is the allowable start-up temperature of turbine 20. At this time, turbine 20 is in the allowable start-up state. Turbine 20 starts up, and gaseous carbon dioxide enters turbine 20 through the inlet. Since the temperature of gaseous carbon dioxide is high at this time, the entry of gaseous carbon dioxide will not affect the blades of turbine 20. The control method of the above energy storage system 01 is simple in logic and easy to implement, and can realize the operation of energy storage system 01 in a relatively safe, reliable and stable manner.

[0065] Based on the control method of the energy storage system 01 described above, in a preferred embodiment, the heating device 10 used to control the heating device 10 as described in the above technical solution further includes a monitoring module. Correspondingly, step S701 in the control method of the energy storage system 01 specifically includes the following steps: before the turbine starts, the temperature acquisition element collects and transmits the temperature data of gaseous carbon dioxide at the inlet of the turbine 20; the control component compares the received temperature data with the allowable start-up temperature of the turbine 20; when the temperature data is less than the allowable start-up temperature of the turbine 20, the pressure pump 220 operates, and the heating module 200 drives the hot fluid to circulate in the heating loop; when the temperature data is greater than the allowable start-up temperature of the turbine 20, the turbine 20 starts, and the pressure pump 220 stops operating. The control method of the energy storage system 01 described above can obtain the temperature data of gaseous carbon dioxide at the inlet of the turbine 20 relatively accurately, thereby enabling precise control of the temperature of gaseous carbon dioxide at the inlet of the turbine 20 by controlling the operating time of the pressure pump 220, thus facilitating accurate control of the start-up of the turbine 20.

[0066] 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.

[0067] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A heating device applied to an energy storage system, the energy storage system comprising a turbine and an energy-releasing heat exchanger, characterized in that, The heating device includes: The heat exchange module includes a shell side for the flow of hot fluid and a tube side for the flow of gaseous carbon dioxide, wherein the inlet of the tube side is connected to the outlet of the energy-releasing heat exchanger and the outlet is connected to the inlet of the turbine. A heating module is connected in a closed loop to the shell side and cooperates to form a heating loop to drive the hot fluid to flow in the heating loop, for providing the hot fluid at a temperature higher than that of gaseous carbon dioxide in the tube side; The heating module includes a heat storage tank, a pressure pump, and a heating pipeline. The heat storage tank, the pressure pump, and the shell side are connected in a closed loop through the heating pipeline to form the heating loop. It also includes a monitoring module, which includes a temperature acquisition element and a control component. The temperature acquisition element is located at the end of the tube side near the turbine inlet. The control component is used to activate the pressure pump and drive the heating module to circulate the hot fluid in the heating loop when the temperature of the gaseous carbon dioxide at the inlet end is lower than the turbine start-up allowable temperature; and to activate the turbine and stop the pressure pump when the temperature of the gaseous carbon dioxide at the inlet end is higher than the turbine start-up allowable temperature.

2. The heating device according to claim 1, characterized in that, The heat exchange module includes a heat exchange component, which includes an inner tube and an outer tube. The inner tube is inserted into the outer tube and is sealed and connected to the outer tube as a whole. The inner tube is connected to the outlet of the energy release heat exchanger and the inlet of the turbine. The outer tube is connected to the heating module. When there is only one heat exchange component, the inner cavity of the inner tube forms the tube side, and the cavity between the outer tube and the inner tube forms the shell side.

3. The heating device according to claim 2, characterized in that, The number of heat exchange components is multiple, and the multiple inner tubes are connected in series through at least one heat exchange joint to form the tube side. The adjacent openings of adjacent outer tubes are connected by connecting pipes, and the multiple outer tubes, multiple inner tubes and the connecting pipes cooperate to form the shell side.

4. The heating device according to claim 1, characterized in that, The heat storage tank is used to store the hot fluid, and the pressure pump is used to provide the driving force for the flow of the hot fluid.

5. The heating device according to claim 4, characterized in that, The temperature acquisition element is used to acquire temperature data of gaseous carbon dioxide at the turbine inlet. The control component is communicatively connected to the temperature acquisition element, the pressure pump, and the turbine, and is used to control the operation of the pressure pump and the turbine based on the acquired temperature data.

6. The heating device according to claim 1, characterized in that, The heat fluid is one of hot oil, pressurized hot water, or molten salt.

7. An energy storage system comprising a closed-loop connected energy storage tank, an energy release heat exchanger, a turbine, and a gas storage tank, wherein the energy storage tank is used to store liquid carbon dioxide, characterized in that, It also includes a heating device as described in any one of claims 1-6, wherein the inlet of the tube side of the heating device is connected to the outlet of the energy-releasing heat exchanger, and the outlet is connected to the inlet of the turbine.

8. The energy storage system according to claim 7, characterized in that, It also includes a compression device connected to the energy storage tank. The compression device is used to compress and condense gaseous carbon dioxide into liquid carbon dioxide. The heat of the hot fluid in the heating device comes from the heat of compression generated by the compression device during the energy storage process.

9. A control method for an energy storage system as described in any one of claims 7-8, characterized in that, Includes the following steps: Step S701: Before the turbine starts up, the heating module drives the hot fluid to circulate in the heating loop. Step S702: The gaseous carbon dioxide in the tube exchanges heat with the hot fluid; In step S703, the gaseous carbon dioxide in the tube is heated to a set temperature, which is the turbine start-up allowable temperature.

10. The control method for the energy storage system according to claim 9, characterized in that, For controlling the heating device as described in claim 5, step S701 specifically includes the following steps: Before the turbine starts up, the temperature acquisition element collects and transmits the temperature data of gaseous carbon dioxide at the turbine inlet; The control unit compares the received temperature data with the turbine start-up allowable temperature. When the temperature data is lower than the turbine start-up allowable temperature, the pressure pump works and the heating module drives the hot fluid to circulate in the heating loop. When the temperature data is higher than the turbine start-up allowable temperature, the turbine starts and the pressure pump stops working.

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