Energy storage system coupled with industrial waste heat

Abstract

The application provides a kind of energy storage system coupled with industrial waste heat. It includes: energy storage unit, which is connected with the waste heat channel of industrial system through waste heat utilization unit, and the energy storage unit includes first circuit and compressor and several levels of energy storage modules arranged on the first circuit in turn and located after the waste heat utilization unit, the first circuit flows through the waste heat utilization unit, and different energy storage modules are used for storing energy of different grade heat; energy release unit, including second circuit and turbine generator arranged on the second circuit, the second circuit flows through each energy storage module; each passage is used for circulating working medium, and the working medium is used to drive heat to flow in each passage. The energy storage system coupled with industrial waste heat provided by the application can store the heat in the working medium more completely by setting the waste heat utilization unit in the waste heat channel of the industrial system and setting the multi-stage energy storage module, thereby avoiding the waste of industrial waste heat.

Description

Technical Field

[0001] This application belongs to the field of energy machinery technology, and more specifically, relates to an energy storage system coupled with industrial waste heat. Background Technology

[0002] To effectively utilize industrial waste heat, Carnot battery energy storage systems are installed in industrial systems. However, existing Carnot battery energy storage systems lack the ability to utilize heat energy of different grades, resulting in the use of only a portion of the heat energy during the energy storage process. This leads to low electricity-to-electricity conversion efficiency and consequently, a significant amount of industrial waste heat is wasted. Summary of the Invention

[0003] The purpose of this application is to provide an energy storage system coupled with industrial waste heat to solve the technical problem of significant waste of industrial waste heat in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is to provide an energy storage system coupled with industrial waste heat, which includes:

[0005] An energy storage unit is connected to the waste heat channel of the industrial system through a waste heat utilization unit. The energy storage unit includes a first circuit and a compressor and several energy storage modules arranged sequentially on the first circuit and located after the waste heat utilization unit. The first circuit flows through the waste heat utilization unit, and different energy storage modules are used to store heat energy of different grades.

[0006] The energy release unit includes a second circuit and a turbine generator disposed on the second circuit, the second circuit flowing through each of the energy storage modules;

[0007] Each loop is used to circulate the working fluid, which in turn drives the flow of heat within each loop.

[0008] Optionally, the energy storage unit further includes a renewable energy generation device connected to the compressor to provide electricity.

[0009] Optionally, the renewable energy power generation device includes a solar power generation device and / or a wind power generation device.

[0010] Optionally, the same energy storage module includes several sub-modules; different sub-modules are connected by a third passage, and a regulating valve is provided on the third passage.

[0011] Optionally, the compressor has at least two stages, with each stage of the compressor connected in series in the first circuit, and a fourth passage connecting each stage of the compressor; a three-way valve is provided in the third passage, and each branch of the three-way valve is connected to two different sub-modules and the fourth passage respectively.

[0012] Optionally, a fifth path is also connected between the fourth path and the submodule, and the connection point between the fourth path and the fifth path is located downstream of the connection point between the third path and the fourth path.

[0013] Optionally, the energy storage module includes a sensible heat energy storage module and a latent heat energy storage module, and the sub-module is disposed in the sensible heat energy storage module.

[0014] Optionally, multiple sensible heat storage modules are provided, and different sensible heat storage modules are used to store thermal energy of different grades. The latent heat storage module is provided between two sensible heat storage modules of different grades.

[0015] Optionally, a seventh passage connects the waste heat channel of the industrial system to the inlet of the compressor; and / or an eighth passage connects the outlet of the compressor to the industrial system.

[0016] Optionally, the turbine generator is provided with at least two stages.

[0017] Optionally, an interstage heat exchanger is provided between two adjacent turbine generators and on the second circuit; different interstage heat exchangers are connected to energy storage modules of different quality levels through a sixth circuit.

[0018] Optionally, a pump device is provided in the second circuit, between the last stage turbine generator and the energy storage module.

[0019] Optionally, an auxiliary fuel system is provided in the second circuit, located between the energy storage module and the first-stage turbine generator, the auxiliary fuel system being used to heat the working fluid in the second circuit.

[0020] The energy storage system coupled with industrial waste heat provided in this application embodiment has at least the following beneficial effects:

[0021] The first loop in the energy storage unit flows through the waste heat recovery unit. As the working fluid circulates in the first loop, it heats up through heat exchange in the waste heat recovery unit and flows to the compressor. Under the compression action of the compressor, it continues to heat up and pressurize, storing the heat in various energy storage modules. After energy storage, the working fluid cools and depressurizes, then circulates back to the waste heat recovery unit for further heat exchange. Thus, by setting up waste heat recovery units and multiple energy storage modules in the waste heat channel of the industrial system, the heat in the working fluid can be stored more thoroughly, thereby avoiding the waste of industrial waste heat.

[0022] The second loop in the energy release unit flows through each energy storage module. The energy release of the energy storage module allows the working fluid to carry away the heat energy and flow to the turbine generator, thereby realizing the conversion of heat energy into electrical energy. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0024] Figure 1 This is a schematic diagram of an energy storage system coupled with industrial waste heat in some embodiments of this application;

[0025] Figure 2 This is a schematic diagram of an energy storage unit in some embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the energy-releasing unit in some embodiments of this application;

[0027] Figure 4 This is a schematic diagram of an industrial system in some embodiments of this application. Detailed Implementation

[0028] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0029] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0030] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0031] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0034] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0035] It is understood that steam is used as the working medium in the description of the various embodiments of this application.

[0036] Please refer to the following: Figures 1 to 4 The energy storage system coupled with industrial waste heat provided in the embodiments of this application will now be described.

[0037] refer to Figure 1 The energy storage system coupled with industrial waste heat described in this application embodiment includes an energy storage unit 10 and an energy release unit 20.

[0038] In this embodiment, the energy storage unit 10 and the waste heat channel of the industrial system 40 are connected through the waste heat utilization unit 30. (Reference) Figure 1 and Figure 4 It is understood that in this embodiment, the industrial system 40 is a heavy oil extraction system, which includes a heavy oil injection and production well 410, a steam separator 420, a processing station 430, a water treatment system 440 and a boiler system 450 that are connected in sequence. The aforementioned waste heat utilization unit 30 is located between the steam separator 420 and the processing station 430.

[0039] Specifically, the process flow of the heavy oil extraction system is as follows: the produced fluid extracted from the heavy oil injection-production well 410 of the oilfield passes through a steam separator 420. The degassed produced fluid separated by the steam separator 420 enters other process flows for further processing. The low-temperature, low-pressure steam (e.g., steam at 160℃-180℃ and 0.52MPa-0.65MPa) separated by the steam separator 420 enters the waste heat utilization unit 30 for heat exchange and is converted into hot water at approximately 70℃. The hot water then passes through a treatment station 430, a water treatment system 440, and a boiler system 450, and is converted back into high-temperature, high-pressure steam for use in heavy oil extraction. That is, the industrial waste heat mentioned in this application is the low-temperature, low-pressure steam separated by the steam separator 420.

[0040] It is understood that the aforementioned waste heat utilization unit 30 is a steam-to-steam heat exchanger. One side is coupled to the heavy oil extraction process, wherein the inlet is the aforementioned low-temperature, low-pressure steam at 160℃-180℃ and 0.52MPa-0.65MPa, and the outlet is hot water at about 70℃; the other side is coupled to the energy storage unit 10, wherein the inlet is low-temperature steam and the outlet is high-temperature steam.

[0041] refer to Figure 1 It is understood that the energy storage unit 10 includes a first loop 111, a compressor 120, and energy storage modules 130 at various stages. The first loop 111 is used to circulate the working fluid, so that the working fluid, after heat exchange in the waste heat utilization unit 30, circulates once in the first loop 111 and then returns to the waste heat utilization unit 30 for heat exchange. In this embodiment, the working fluid is steam. The compressor 120 and the energy storage modules 130 at various stages are arranged on the first loop 111 and located after the waste heat utilization unit 30. For example, the first loop 111 flows sequentially through the waste heat treatment unit, the compressor 120, and the energy storage modules 130 at various stages. Thus, the saturated steam formed after heat exchange in the waste heat utilization unit 30 can be compressed by the compressor 120 to form high-temperature and high-pressure superheated steam, which flows to the energy storage modules 130 at various stages for thermal energy storage. After energy storage in the energy storage modules 130, the superheated steam is converted into low-temperature and low-pressure steam or unsaturated water and flows back to the waste heat utilization unit 30 for heat exchange again.

[0042] refer to Figure 1 and Figure 2 It is important to understand that energy storage modules 130 of different levels are used to store thermal energy of different grades. For example, when the working fluid is steam, the energy storage module 130 can be configured as a sensible heat energy storage module 131 and a latent heat energy storage module 132, or it can be configured as multiple sensible heat energy storage modules 131 to store energy for steam in different states. After being compressed by the compressor 120, the steam becomes superheated steam. During the process of converting into low-temperature, low-pressure steam or unsaturated water, a large amount of sensible heat and latent heat will be released at different cooling stages. For example, a large amount of sensible heat will be released during the cooling of superheated steam into saturated steam, latent heat will be released during the conversion of saturated steam into saturated water, and sensible heat will be released during the cooling of saturated water into unsaturated water.

[0043] Therefore, by setting up multi-level energy storage modules 130 to store the heat energy released during the cooling process of superheated steam, the heat energy released by superheated steam at different cooling stages can be fully utilized, avoiding excessive waste of industrial waste heat, which is conducive to improving the energy storage efficiency of the Carnot battery energy storage system.

[0044] refer to Figure 1The energy release unit 20 includes a second circuit 211 and a turbine generator 220 disposed on the second circuit 211. The second circuit 211 flows through energy storage modules 130 at various stages. A circulating working fluid flows in the second circuit 211 and is used to transfer the heat energy released by the energy storage modules 130 to the turbine generator 220 for power generation. In some embodiments, the working fluid in the second circuit 211 may be steam.

[0045] refer to Figure 1 and Figure 2 In some embodiments, the energy storage unit 10 further includes a renewable energy generation device 140, which is connected to the compressor 120 to provide power.

[0046] In some embodiments, the renewable energy power generation device 140 includes a solar power generation device and / or a wind power generation device.

[0047] By connecting the compressor 120 to the renewable energy power generation device 140, the electrical energy generated by the renewable energy power generation device 140 can drive the compressor 120, which compresses saturated steam to form superheated steam. The energy storage module 130 then stores the heat energy in the superheated steam. That is, the heat energy generated by the renewable energy power generation device can be indirectly stored in the energy storage module 130. Thus, when the renewable energy power generation device 140 is generating electricity, the electrical energy directly drives the compressor 120 and is indirectly stored in the energy storage module 130. When the renewable energy power generation device 140 is stopped, the compressor 120 is driven by other electrical sources, thereby solving the indirectness problem of renewable energy power generation (especially solar or wind power).

[0048] refer to Figure 1 and Figure 2 In some embodiments, the same energy storage module 130 includes several sub-modules 1301; different sub-modules 1301 are connected by a third passage 112, and a regulating valve is provided on the third passage 112. It should be understood that the energy storage module 130 in this embodiment takes a sensible heat energy storage module 131 as an example, and takes two sub-modules 1301 as an example.

[0049] When storing energy with a working fluid of the same grade, although the working fluid remains within the same grade range after storage, its temperature, pressure, and other parameters decrease, and its flow rate may also change. This results in lower energy storage efficiency of the working fluid in the same energy storage module 130. To address this, multiple sub-modules 1301 are set up in the same energy storage module 130, and a third passage 112 is connected between the sub-modules 1301. After the working fluid has undergone energy storage once in the first sub-module 1301, although its parameters have changed, the parameters of the working fluid can be matched with the high-efficiency operating range of the second sub-module 1301 by adjusting the relevant parameters of the working fluid through the regulating valve, thereby improving the energy storage efficiency.

[0050] refer to Figure 1 and Figure 2 It is understandable that, in order to enable the compressor 120 to fully compress the working fluid so that the parameters of the working fluid can reach the optimal operating conditions of the energy storage module 130, and also to make full use of the residual heat energy of the stored working fluid, based on the aforementioned embodiment, the compressor 120 is provided with at least two stages, and each stage of the compressor 120 is connected in series in the first circuit 111.

[0051] refer to Figure 2 In this embodiment, taking a compressor 120 with two stages as an example, namely a first compressor 121 and a second compressor 122, a fourth passage 113 connects the first compressor 121 and the second compressor 122, that is, the working fluid compressed by the first compressor 121 flows to the second compressor 122 through the fourth passage 113. At the same time, a three-way valve is provided on the third passage 112, and each branch of the three-way valve is connected to two different sub-modules 1301 and the fourth passage 113 respectively.

[0052] Specifically, after energy storage in the first submodule 1301 of the energy storage module 130, part of the working fluid flows to the third passage 112. At the same time, the working fluid compressed by the first compressor 121 flows to the fourth passage 113. At this time, the temperature of the working fluid in the third passage 112 is higher than that in the fourth passage 113. Since the third passage 112 and the fourth passage 113 are connected, part of the working fluid in the third passage 112 flows to the second submodule 1301 for further energy storage. The remaining part of the working fluid in the third passage 112 flows to the fourth passage 113 and mixes with the working fluid in the fourth passage 113. After the temperature of the mixed working fluid is increased to a certain extent, it enters the second compressor 122. This fully utilizes the thermal energy of the working fluid stored in the third passage 112 and also makes the parameters of the working fluid entering the second compressor 122 more suitable for the high-efficiency operating range of the second compressor 122.

[0053] refer to Figure 2In a further embodiment, a fifth passage 114 is also connected between the fourth passage 113 and the second submodule 1301. The connection point between the fourth passage 113 and the fifth passage 114 is located downstream of the connection point between the third passage 112 and the fourth passage 113. At the same time, a three-way valve is provided at the connection point between the fourth passage 113 and the fifth passage 114.

[0054] The working fluid compressed by the first compressor 121 flows into the fourth passage 113 to enter the second compressor 122. At this time, since the third passage 112 is connected to the fourth passage 113, part of the working fluid that has been stored in the third passage 112 also flows to the fourth passage 113. As a result, the flow rate of the working fluid in the fourth passage 113 to the second compressor 122 is large, which may exceed the operating limit of the second compressor 122 and thus affect the stable operation of the second compressor 122.

[0055] To this end, a three-way valve is installed on the fourth passage 113, and a fifth passage 114 is connected between one branch of the three-way valve and the second submodule 1301. The three-way valve diverts the working fluid in the fourth passage 113 to reduce the flow rate of the working fluid flowing into the second compressor 122 in the fourth passage 113 to a reasonable range. At the same time, the mixed working fluid in the fifth passage 114 flows to the second submodule 1301, where the second submodule 1301 stores the heat it contains.

[0056] refer to Figure 1 and Figure 2 In some embodiments, the energy storage module 130 includes a sensible heat energy storage module 131 and a latent heat energy storage module 132, with a submodule 1301 disposed above the sensible heat energy storage module 131. For example, the sensible heat energy storage module 131 may be disposed before the latent heat energy storage module 132, or the latent heat energy storage module 132 may be disposed before the sensible heat energy storage module 131.

[0057] It is understood that in the energy storage system coupled with industrial waste heat in this embodiment of the application, the working fluid circulating in the energy storage unit 10 is steam. Furthermore, since the heat energy released by superheated steam during cooling to saturated steam is sensible heat, the heat energy released by saturated steam during cooling to saturated water is latent heat, and the heat energy released by saturated water during cooling to unsaturated water is sensible heat, by setting up the sensible heat energy storage module 131 and the latent heat energy storage module 132, the heat energy released by superheated steam at each stage of cooling to unsaturated water can be fully utilized.

[0058] refer to Figure 1 and Figure 2In some embodiments, multiple sensible heat storage modules 131 are provided. This embodiment takes two as an example, namely a first sensible heat storage module 1311 and a second sensible heat storage module 1312; at the same time, one latent heat storage module 132 is provided, which is disposed between the two sensible heat storage modules 131. Each energy storage module 130 is responsible for storing thermal energy of different grades.

[0059] In the specific configuration, for the sensible heat storage module 131, the storage material of the first sensible heat storage module 1311 can be molten salt or fixed heat storage material (such as sand-rock-mineral oil, refractory bricks, etc.), and its specific type is determined according to the circulating working fluid in the high-temperature section; while the storage material of the second sensible heat storage module 1312 can be a phase change material in the low-temperature section, such as wax phase change material, salt phase change material, etc., and its specific selection can be combined with the circulating working fluid parameters and the conditions of the application scenario.

[0060] For the latent heat energy storage module 132, the operating temperature range of its storage material is near the latent heat temperature range of the working fluid, such as NaNO3, NaNO3-KNO3 and other phase change materials; the specific material needs to be selected according to the temperature range of the system application scenario.

[0061] For example, the first sensible heat storage module 1311 is responsible for storing the sensible heat released during the cooling of superheated steam to saturated steam, the latent heat storage module 132 is used to store the latent heat released during the cooling of saturated steam to saturated water, and the second sensible heat storage module 1312 is used to store the sensible heat released during the cooling of saturated water to unsaturated water; meanwhile, in some embodiments, each of the sub-modules 1301 in the aforementioned embodiments is disposed in the second sensible heat storage module 1312.

[0062] It is understandable that the temperature of the low-temperature, low-pressure steam separated by the steam separator 420 in the heavy oil extraction system is higher than the temperature of the steam after heat exchange in the waste heat utilization unit 30 in the first loop 111. Therefore, to ensure better utilization of this low-temperature, low-pressure steam, reference... Figure 1 , Figure 2 and Figure 4In some embodiments, a seventh passage 115 connects the waste heat channel of the industrial system to the inlet of the compressor 120. That is, the low-temperature, low-pressure steam separated by the steam separator 420 in the heavy oil extraction system enters the compressor 120 through the seventh passage 115, in addition to entering the waste heat utilization unit 30. Together with the steam in the first loop 111, the steam is compressed by the compressor 120 to increase its temperature and pressure into high-temperature, high-pressure steam. Thus, by mixing the low-temperature, low-pressure steam separated by the steam separator 420 in the heavy oil extraction system with the steam after heat exchange in the waste heat utilization unit 30, the temperature of the steam entering the compressor 120 in the first loop 111 can be increased, thereby improving the compression efficiency of the compressor 120.

[0063] Furthermore, see also Figure 1 , Figure 2 and Figure 4 An eighth passage 116 connects the outlet of compressor 130 to the industrial system. It should be understood that the eighth passage 116 can be directly connected to the outlet of compressor 120 or directly connected to the first circuit 111. That is, the high-temperature, high-pressure steam formed by compressor 120 can partially enter the heavy oil extraction system through the eighth passage 116 for heavy oil extraction, thereby reducing the processing capacity of processing station 430, water treatment system 440, and boiler system 450 in the heavy oil extraction system.

[0064] refer to Figure 3 In some embodiments, the turbine generator 220 is provided with at least two stages, and the turbine generators 220 of different stages are driven to generate electricity by working fluids with different parameters. For example, the turbine generator 220 can be provided with two stages or three stages. In this way, after the working fluid is heated by the energy storage module 130, it can first enter the first stage turbine generator 220 to generate electricity. After the first stage of power generation, the temperature and other parameters of the working fluid are reduced, so it can enter the next stage turbine generator 220 to generate electricity, thereby avoiding the waste of residual heat energy in the working fluid.

[0065] Furthermore, based on the aforementioned embodiment, an interstage heat exchanger 230 is provided between two adjacent turbine generators 220 and on the second circuit 211; different interstage heat exchangers 230 are connected to energy storage modules 130 of different quality ranges through the sixth circuit 212.

[0066] The following describes this embodiment in detail with different implementation methods.

[0067] In some embodiments, the turbine generator 220 has two stages, with an interstage heat exchanger 230 positioned between the two stages. An energy storage module 130 is typically provided. One side of the interstage heat exchanger 230 is connected to the energy storage module 130 via a sixth loop 212, while the other side is connected to a second loop 211. The working fluid, heated by the energy release module, flows along the sixth loop 212 to the interstage heat exchanger 230, where it exchanges heat with the working fluid in the second loop 211. This improves the temperature, pressure, and other parameters of the working fluid in the second loop 211 after one power generation cycle, making it more suitable for the power generation conditions of the next-stage turbine generator 220.

[0068] refer to Figure 3 In other embodiments, the turbine generator 220 is configured with three stages, with interstage heat exchangers 230 positioned between adjacent turbine generator stages 220. Multiple energy storage modules 130 are configured (i.e., sensible heat energy storage modules 131 and / or latent heat energy storage modules 132 of different grades as described in the preceding embodiments). One side of each interstage heat exchanger 230 is connected to a different energy storage module 130 via a sixth loop 212, while the other side of each interstage heat exchanger 230 is connected to a second loop 211. The operating principle in this embodiment is the same as in the previous embodiment and will not be repeated here. However, unlike the previous embodiment, by configuring multiple interstage heat exchangers 230 and multiple turbine generators 220, the thermal energy stored in each energy storage module 130 can be fully utilized to heat the working fluid in the second loop 211, thereby enabling more thermal energy to be used for power generation and improving power generation efficiency.

[0069] It should be understood that more interstage heat exchangers 230 can be set. The specific setting method can be matched according to the number of energy storage modules 130 of different quality ranges. Similarly, the number of turbine generators 220 is also adjusted accordingly.

[0070] refer to Figure 1 and Figure 3 In some embodiments, a pump device 240 is provided in the second loop 211, located between the last-stage turbine generator 220 and the energy storage module 130. For example, in embodiments where a first sensible heat energy storage module 1311, a second sensible heat energy storage module 1312, and a latent heat energy storage module 132 are provided, and in embodiments where the turbine generator 220 has three stages, the pump device 240 is provided between the last-stage turbine generator 220 and the second sensible heat energy storage module 1312. By providing the pump device 240, the pressure of the working fluid in the second loop 211 can be increased to a certain extent before entering the second sensible heat energy storage module 1312, thereby increasing the circulation speed of the working fluid in the second loop 211 and improving the power generation efficiency of the energy release unit 20.

[0071] refer to Figure 1 and Figure 3 In some embodiments, an auxiliary fuel system 250 is provided in the second loop 211, located between the energy storage module 130 and the first-stage turbine generator 220. The auxiliary fuel system 250 is used to heat the working fluid in the second loop 211. For example, in the aforementioned embodiments where a first sensible heat energy storage module 1311, a second sensible heat energy storage module 1312, and a latent heat energy storage module 132 are provided, and in embodiments where the turbine generator 220 has three stages, the auxiliary fuel system 250 is located between the first sensible heat energy storage module 1311 and the first-stage turbine generator 220. It is understood that the auxiliary fuel system 250 can be a boiler system used to heat the working fluid (i.e., steam) in the second loop 211 before it enters the turbine generator 220, thereby increasing the steam temperature so that each turbine generator 220 can operate in its high-efficiency range.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage system coupled to industrial waste heat, characterized by, The application relates to a heat energy storage and release system for an industrial system. The system comprises: a heat storage unit connected to a waste heat channel of the industrial system through a waste heat utilization unit, the heat storage unit comprising a first loop, a compressor and a plurality of heat storage modules arranged in sequence on the first loop and located after the waste heat utilization unit, the first loop flowing through the waste heat utilization unit, and the different heat storage modules being used for storing heat energy of different grades; a heat release unit comprising a second loop and a turbine generator arranged on the second loop, the second loop flowing through the heat storage modules; each loop is used for circulating a working medium, and the working medium is used for driving heat to flow in each loop; the industrial system is a heavy oil exploitation system, and comprises a heavy oil injection and production well, a steam separator, a treatment station, a water treatment system and a boiler system which are connected in sequence and communicate with each other, wherein the waste heat utilization unit is arranged between the steam separator and the treatment station; the same heat storage module comprises a plurality of sub-modules; the third passage is communicated between different sub-modules; and an adjusting valve is arranged on the third passage; the compressor is provided with at least two stages, and each stage of the compressor is arranged in series on the first loop; the fourth passage is communicated between each stage of the compressor; a three-way valve is arranged on the third passage, and each branch of the three-way valve is connected to two different sub-modules and the fourth passage; 2. The coupled industrial waste heat energy storage system of claim 1, wherein: a seventh passage is communicated between the waste heat channel of the industrial system and the inlet of the compressor; and / or an eighth passage is communicated between the outlet of the compressor and the industrial system.

3. The coupled industrial waste heat energy storage system of claim 1, wherein: The heat storage unit further comprises a renewable energy power generation device connected to the compressor to provide electric power.

4. The coupled industrial waste heat energy storage system of claim 3, wherein: A fifth passage is further communicated between the fourth passage and the sub-modules, and the communication point of the fourth passage and the fifth passage is located downstream of the communication point of the third passage and the fourth passage.

5. The coupled industrial waste heat energy storage system of claim 4, wherein: The heat storage modules comprise a sensible heat storage module and a latent heat storage module, and the sub-modules are arranged in the sensible heat storage module.

6. The coupled industrial waste heat energy storage system of claim 1, wherein: A plurality of sensible heat storage modules are arranged, and the different sensible heat storage modules are used for storing heat energy of different grades, and the latent heat storage module is arranged between two sensible heat storage modules of different grade sections.

7. The coupled industrial waste heat energy storage system of claim 6, wherein: The turbine generator is provided with at least two stages.

8. An energy storage system coupled to industrial waste heat as claimed in any one of claims 1, 6 or 7, characterised in that: An inter-stage heat exchanger is arranged between adjacent two stages of the turbine generator and located on the second loop; and different inter-stage heat exchangers are respectively communicated with the heat storage modules of different grade sections through a sixth loop.

9. An energy storage system coupled to industrial waste heat as claimed in any one of claims 1, 6 or 7, wherein: A pump device is arranged in the second loop, between the last stage of the turbine generator and the heat storage module. An auxiliary fuel system is arranged in the second loop, between the heat storage module and the first stage of the turbine generator, and the auxiliary fuel system is used for heating the working medium in the second loop.

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