A system for coupling a modular molten salt energy storage device to a solid energy storage thermal reservoir

Abstract

The application discloses a system of a modular molten salt energy storage device coupled with solid energy storage heat preservation, wherein the outlet of a deaerator is communicated with the inlet of a molten salt energy storage device, the outlet of the molten salt energy storage device is divided into three paths, one of the three paths is communicated with the inlet of the deaerator through an energy storage device starting steam exhaust pipeline, the second path is communicated with an industrial steam supply main pipeline through the molten salt energy storage device, the third path is communicated with the inlet of an auxiliary steam header of an associated unit through an energy storage device auxiliary steam supply pipeline, the outlet of the auxiliary steam header is communicated with the inlet of the deaerator through an auxiliary steam header to deaerator heating steam pipeline, a deaerator water supply pipeline is communicated with the water supply port of the deaerator, and the industrial steam supply main pipeline is communicated with the deaerator, so that the energy storage device can be started in a cold state without external steam supply.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a system for coupling a modular molten salt energy storage device with solid energy storage and insulation. Background Technology

[0002] Molten salt thermal energy storage technology has been widely applied in the solar photovoltaic industry, converting solar energy into thermal energy for storage, and then converting it into steam to drive a steam turbine for power generation, enabling a continuous, stable, and controllable power supply. Because molten salt thermal energy storage technology can generate steam with varying parameters, it has excellent application scenarios in heating and steam supply for coal-fired power units. However, there are few reports on the actual engineering applications of molten salt thermal energy storage coupled with coal-fired power units for peak shaving and heating. On the one hand, the power grid needs peak shaving from cogeneration units; on the other hand, cogeneration units need to ensure heating or steam supply. When these two demands conflict, a portion of the electricity generated by the coal-fired power unit can be electrically heated to heat molten salt, converting electrical energy into thermal energy for storage. This enhances the unit's deep peak shaving capacity and earns rewards for peak shaving ancillary services. Simultaneously, the thermal energy stored in the molten salt can be released as needed to increase the unit's heating or steam supply capacity, achieving thermoelectric decoupling of the unit.

[0003] The energy storage device is coupled with the associated thermal power unit. During unit operation, energy is stored by activating electric heaters to meet the unit's peak shaving and frequency regulation requirements. During heat release, ambient temperature demineralized water is passed into the deaerator for heating. The heating steam source is provided by the associated unit and then enters the energy storage device for heat exchange and steam generation to meet the unit's peak demand, steam supply, and heating requirements.

[0004] Due to the physical properties of molten salt, the feedwater temperature entering the molten salt unit cannot be lower than the solidification temperature of the molten salt. Therefore, the demineralized water needs to be heated and deoxygenated before entering the molten salt unit. Currently, all modular molten salt thermal storage projects in operation cannot start automatically and require external steam to deoxygenate and heat the feedwater. When all associated units are shut down, there is no external steam supply, and the energy storage unit cannot start. Existing modular molten salt energy storage solutions all use thermal insulation cotton for external insulation of the energy storage unit. The amount of thermal insulation cotton used is large, and the external insulation effect is poor at irregular splicing points. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a modular molten salt energy storage device coupled with solid energy storage and insulation system. This system enables the energy storage device to start up in a cold state without external steam supply.

[0006] To achieve the above objectives, this invention discloses a modular molten salt energy storage device coupled with solid energy storage and insulation system, comprising a molten salt energy storage device, a steam generation pipeline for the energy storage device, a start-up exhaust pipeline for the energy storage device, a steam supply pipeline from the energy storage device to the auxiliary steam header, a steam supply pipeline from the molten salt energy storage device to the industrial steam supply pipeline, an industrial steam supply header, an auxiliary steam header of the associated unit, a steam heating pipeline from the auxiliary steam header to the deaerator, a water supply pipeline for the deaerator, and a deaerator; The outlet of the deaerator is connected to the inlet of the molten salt energy storage device. The outlet of the molten salt energy storage device is divided into three paths. One path is connected to the inlet of the deaerator via the start-up exhaust pipe of the energy storage device. The second path is connected to the industrial steam supply pipe via the molten salt energy storage device and the industrial steam supply header. The third path is connected to the auxiliary steam header of the associated unit via the auxiliary steam header. The outlet of the auxiliary steam header of the associated unit is connected to the deaerator heating steam pipe via the auxiliary steam header and the inlet of the deaerator. The deaerator water supply pipe is connected to the deaerator water supply port. The industrial steam supply header is connected to the deaerator.

[0007] A further improvement of the modular molten salt energy storage device coupled with solid energy storage and insulation system described in this invention is as follows: Furthermore, the outlet of the deaerator is connected to the inlet of the molten salt energy storage device via a feedwater pump.

[0008] Furthermore, the industrial steam supply header connects to the deaerator heating steam pipeline.

[0009] Furthermore, the molten salt energy storage device includes several energy storage units.

[0010] Furthermore, each energy storage unit includes a normal water supply valve for the energy storage unit, a water inlet pipe for the thermal storage unit, a water inlet valve for the cold start insulation layer, a water outlet pipe for the insulation layer, a water inlet pipe for the insulation layer, a steam generation pipe for the energy storage unit, a modular molten salt energy storage unit, and an outer solid thermal insulation structure. The inlet of the thermal storage unit's inlet water pipe is connected to the outlet of the water supply pump. The outlet of the thermal storage unit's inlet water pipe is divided into two paths. One path is connected to the inlet of the modular molten salt energy storage unit via the normal water supply valve of the energy storage unit. The other path is connected to the inlet of the outer solid thermal storage insulation structure via the cold start insulation layer inlet valve and the insulation layer inlet water pipe. The outlet of the outer solid thermal storage insulation structure is connected to the inlet of the modular molten salt energy storage unit via the insulation layer outlet water pipe. The outlet of the modular molten salt energy storage unit is connected to the energy storage device's steam generation pipeline via the energy storage unit's steam generation pipeline valve and the energy storage unit's steam generation pipeline.

[0011] Furthermore, the outlet of the modular molten salt energy storage unit is connected to the steam production pipeline of the energy storage device via the steam production pipeline valve of the energy storage unit and the steam production pipeline of the energy storage unit.

[0012] Furthermore, the outlet of the outer solid thermal insulation structure is connected to the inlet of the modular molten salt energy storage unit via the insulation layer water outlet pipe and the cold-start insulation layer water outlet valve.

[0013] Furthermore, the energy storage units are connected in parallel.

[0014] Furthermore, the outer solid thermal insulation structure is located on the outside of the modular molten salt energy storage unit.

[0015] Furthermore, when the associated unit is operating and there is industrial steam supply, steam is supplied to the deaerator through the industrial steam supply header to heat and deoxygenate the demineralized water. When the associated unit is operating without industrial steam supply, the demineralized water is heated and deoxygenated through the auxiliary steam header of the associated unit, and the generated steam is added to the auxiliary steam header of the associated unit.

[0016] The present invention has the following beneficial effects: In the specific operation of the modular molten salt energy storage device coupled with solid energy storage and insulation system described in this invention, the outlet of the molten salt energy storage device is divided into three paths. One path is connected to the inlet of the deaerator via the energy storage device's start-up exhaust pipe. The second path is connected to the industrial steam supply pipe via the molten salt energy storage device and the industrial steam supply header. The third path is connected to the auxiliary steam header of the associated unit via the auxiliary steam header and the inlet of the auxiliary steam header of the associated unit. The outlet of the auxiliary steam header of the associated unit is connected to the deaerator heating steam pipe via the auxiliary steam header and the inlet of the deaerator. When the associated unit is running without industrial steam supply, the demineralized water is heated and deoxygenated through the auxiliary steam header of the associated unit, and the generated steam is added to the auxiliary steam header of the associated unit. Thus, the energy storage device can achieve cold start-up without external steam supply. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram of the molten salt energy storage unit in this invention.

[0018] Among them, 1 is the cold start insulation layer water outlet valve, 2 is the normal water supply valve of the energy storage unit, 3 is the water inlet pipe of the thermal storage unit, 4 is the cold start insulation layer water inlet valve, 5 is the insulation layer water outlet pipe, 6 is the insulation layer water inlet pipe, 7 is the steam generation pipe valve of the energy storage unit, 8 is the steam generation pipe of the energy storage unit, 9 is the modular molten salt energy storage unit, 10 is the outer solid thermal insulation structure, 11 is the molten salt energy storage device, 12 is the steam generation pipe of the energy storage device, 13 is the start-up exhaust pipe of the energy storage device, 14 is the steam supply pipe from the energy storage device to the auxiliary steam header, 15 is the steam supply pipe from the molten salt energy storage device to the industrial steam supply pipe, 16 is the industrial steam supply header, 17 is the industrial steam supply header to the deaerator heating steam pipe, 18 is the auxiliary steam header of the associated unit, 19 is the auxiliary steam header to the deaerator heating steam pipe, 20 is the deaerator makeup water pipe, 21 is the deaerator, and 22 is the feedwater pump. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0023] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0024] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] Example 1 refer to Figure 1The modular molten salt energy storage device coupled with solid energy storage and insulation system of the present invention includes a molten salt energy storage device 11, a steam generation pipeline 12 of the energy storage device, a start-up exhaust pipeline 13 of the energy storage device, a steam supply pipeline from the energy storage device to the auxiliary steam header 14, a steam supply pipeline from the molten salt energy storage device to the industrial steam supply pipeline 15, an industrial steam supply header 16, an industrial steam supply header to the deaerator heating steam pipeline 17, an auxiliary steam header of the associated unit 18, an auxiliary steam header to the deaerator heating steam pipeline 19, a deaerator makeup water pipeline 20, a deaerator 21, and a feedwater pump 22; The outlet of deaerator 21 is connected to the inlet of molten salt energy storage device 11 via feedwater pump 22. The outlet of molten salt energy storage device 11 is divided into three paths. One path is connected to the inlet of deaerator 21 via the energy storage device start-up exhaust pipe 13. The second path is connected to the industrial steam supply pipe 15 via the molten salt energy storage device and the industrial steam supply header 16. The third path is connected to the auxiliary steam header 14 via the energy storage device and the inlet of the auxiliary steam header 18 of the associated unit. The outlet of the auxiliary steam header 18 of the associated unit is connected to the deaerator heating steam pipe 19 via the auxiliary steam header and the inlet of deaerator 21. The deaerator makeup water pipe 20 is connected to the makeup water port of deaerator 21. The industrial steam supply header 16 is connected to the deaerator heating steam pipe 17 via the industrial steam supply header and the deaerator 21.

[0028] refer to Figure 2 The molten salt energy storage device 11 includes several energy storage units. Each energy storage unit includes a cold start insulation layer water outlet valve 1, a normal water supply valve for the energy storage unit 2, a water inlet pipe for the thermal storage unit 3, a cold start insulation layer water inlet valve 4, an insulation layer water outlet pipe 5, an insulation layer water inlet pipe 6, a steam generation pipe valve for the energy storage unit 7, a steam generation pipe for the energy storage unit 8, a modular molten salt energy storage unit 9, and an outer solid thermal insulation structure 10. The inlet of the thermal storage unit inlet pipe 3 is connected to the outlet of the water supply pump 22. The outlet of the thermal storage unit inlet pipe 3 is divided into two paths. One path is connected to the inlet of the modular molten salt energy storage unit 9 via the normal water supply valve 2 of the energy storage unit. The other path is connected to the inlet of the outer solid thermal storage insulation structure 10 via the cold start insulation layer inlet valve 4 and the insulation layer inlet pipe 6. The outlet of the outer solid thermal storage insulation structure 10 is connected to the inlet of the modular molten salt energy storage unit 9 via the insulation layer outlet pipe 5 and the cold start insulation layer outlet valve 1. The outlet of the modular molten salt energy storage unit 9 is connected to the energy storage device steam generation pipe 12 via the energy storage unit steam generation pipe valve 7 and the energy storage unit steam generation pipe 8.

[0029] Example 2 refer to Figure 1 and Figure 2This embodiment discloses a method for coupling a modular molten salt energy storage device with solid energy storage and insulation. It is based on the system implementation of the modular molten salt energy storage device coupled with solid energy storage and insulation described in this invention. The system includes a cold-start insulation layer water outlet valve 1, a normal water supply valve for the energy storage unit 2, a water inlet pipe for the thermal storage unit 3, a cold-start insulation layer water inlet valve 4, an insulation layer water outlet pipe 5, an insulation layer water inlet pipe 6, a steam generation pipe valve for the energy storage unit 7, and a steam generation pipe for the energy storage unit 8. The block molten salt energy storage unit 9, the outer solid thermal insulation structure 10, the molten salt energy storage device 11, the steam generation pipeline of the energy storage device 12, the start-up exhaust pipeline of the energy storage device 13, the steam supply pipeline from the energy storage device to the auxiliary steam header 14, the steam supply pipeline from the molten salt energy storage device to the industrial steam supply pipeline 15, the industrial steam supply header 16, the industrial steam supply header to the deaerator heating steam pipeline 17, the auxiliary steam header of the associated unit 18, the auxiliary steam header to the deaerator heating steam pipeline 19, the deaerator makeup water pipeline 20, the deaerator 21 and the feed water pump 22, the specific connection relationship is as shown in Example 1; Specifically, the method for coupling solid energy storage and insulation of the modular molten salt energy storage device of the present invention includes the following steps: Molten salt energy storage device 11 is a facility that converts surplus electrical energy into heat energy and stores it in molten salt. When the electricity price is low, an electric heater is put into operation to store energy, and when the electricity price is high, the heat is released to assist the unit in peak demand.

[0030] refer to Figure 1 The deoxygenated water enters the deaerator 21 through the deaerator makeup water pipe 20. The deaerated water is heated and deoxygenated in the deaerator 21. The water is pumped into the molten salt energy storage device 11 by the feed water pump 22 for heat exchange. The heat energy stored in the molten salt energy storage device 11 is absorbed and converted into high-temperature steam. The steam is released through the steam generation pipe 12 of the energy storage device. The generated steam is divided into three paths. The first path enters the start-up exhaust pipe 13 of the energy storage device and discharges the gas with substandard parameters in the initial heat release into the deaerator 21 for recovery. The second path goes through the energy storage device to the auxiliary steam header supply pipe 14. The qualified steam produced can go to the auxiliary steam header 18 of the associated unit. The third path goes through the molten salt energy storage device to the industrial steam supply pipe 15 and merges the generated steam into the industrial steam supply header 16. The industrial steam supply header 16 is equipped with an industrial steam supply header to the deaerator heating steam pipe 17.

[0031] When the associated unit is operating and there is industrial steam supply, steam is supplied to the deaerator 21 through the industrial steam supply header 16 to heat and deoxygenate the demineralized water. When the associated unit is operating without industrial steam supply, the demineralized water is heated and deoxygenated through the auxiliary steam header 18 of the associated unit. The generated steam is added to the auxiliary steam header 18 of the associated unit to supplement auxiliary steam and reduce the unit's coal consumption.

[0032] The energy storage device consists of multiple energy storage units connected in parallel, as referenced. Figure 2The thermal storage unit consists of multiple stacked tanks made of carbon steel. After thermal storage is complete, the tanks are filled with high-temperature molten salt. The upper tanks have a higher temperature, while the lower tanks gradually decrease in temperature. At this point, some heat is conducted through the tanks to the outer solid thermal insulation material. This solid material serves as both insulation and heat storage. After the associated units are shut down, neither the auxiliary steam header 18 nor the industrial steam header 16 provides steam for heating the demineralized water. At this time, the feedwater pump 22 pumps the ambient temperature demineralized water into the energy storage device. The normal water supply valve 2 of the energy storage unit is closed, the cold start insulation layer inlet valve 4 is opened, and the cold start insulation layer outlet valve 1 is opened. The ambient temperature demineralized water enters the insulation layer inlet pipe 6 through the heat storage unit inlet pipe 3 for preliminary heat exchange. After the heat exchange is completed, the water temperature rises above the molten salt solidification temperature. It enters the tank through the insulation layer outlet pipe 5 to exchange heat with the molten salt. After producing steam, it enters the energy storage device steam generation pipe 12 through the energy storage unit steam generation pipe 8. The outer solid heat storage insulation structure 10 has limited heat storage. At this time, a portion of the steam in the auxiliary steam header 18 of the associated unit is introduced into the deaerator 21 to heat the feedwater and gradually increase the feedwater temperature. When the water temperature of the deaerator 21 gradually rises above the molten salt solidification temperature, the normal water supply valve 2 of the energy storage unit is opened, and the cold start insulation layer inlet valve 4 and the cold start insulation layer outlet valve 1 are closed, completing the heat release cold start of the molten salt energy storage device 11.

[0033] When the associated unit is running, the insulation layer does not participate in heat exchange. External steam is used to heat the demineralized water to above the solidification temperature of the molten salt, and then it enters the molten salt energy storage device 11 for heat exchange. At this time, the normal water supply valve 2 of the energy storage unit is open, the cold start insulation layer inlet valve 4 is closed, and the cold start insulation layer outlet valve 1 is closed.

[0034] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0035] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0036] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A system for coupling a modular molten salt energy storage device with solid energy storage and insulation, characterized in that, It includes a molten salt energy storage device (11), a steam generation pipeline of the energy storage device (12), a steam exhaust pipeline for the start-up of the energy storage device (13), a steam supply pipeline from the energy storage device to the auxiliary steam header (14), a steam supply pipeline from the molten salt energy storage device to the industrial steam supply pipeline (15), an industrial steam supply header (16), an auxiliary steam header of the associated unit (18), a steam heating pipeline from the auxiliary steam header to the deaerator (19), a water supply pipeline for the deaerator (20), and a deaerator (21). The outlet of the deaerator (21) is connected to the inlet of the molten salt energy storage device (11). The outlet of the molten salt energy storage device (11) is divided into three paths. One path is connected to the inlet of the deaerator (21) via the start-up exhaust pipe (13) of the energy storage device. The second path is connected to the industrial steam supply pipe (15) of the molten salt energy storage device and the industrial steam supply header (16). The third path is connected to the auxiliary steam header (18) of the associated unit via the auxiliary steam header (14) of the energy storage device and the inlet of the auxiliary steam header (18) of the associated unit. The outlet of the auxiliary steam header (18) of the associated unit is connected to the deaerator heating steam pipe (19) of the auxiliary steam header and the inlet of the deaerator (21). The deaerator water supply pipe (20) is connected to the water supply port of the deaerator (21). The industrial steam supply header (16) is connected to the deaerator (21).

2. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 1, characterized in that, The outlet of the deaerator (21) is connected to the inlet of the molten salt energy storage device (11) via the feed water pump (22).

3. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 1, characterized in that, The industrial steam supply header (16) is connected to the deaerator heating steam pipeline (17) via the industrial steam supply header and the deaerator (21).

4. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 1, characterized in that, The molten salt energy storage device (11) includes several energy storage units.

5. The modular molten salt energy storage device coupled with solid energy storage and insulation system according to claim 4, characterized in that, Each energy storage unit includes a normal water supply valve for the energy storage unit (2), a water inlet pipe for the thermal storage unit (3), a water inlet valve for the cold start insulation layer (4), a water outlet pipe for the insulation layer (5), a water inlet pipe for the insulation layer (6), a steam generation pipe for the energy storage unit (8), a modular molten salt energy storage unit (9), and an outer solid thermal insulation structure (10). The inlet of the thermal storage unit water inlet pipe (3) is connected to the outlet of the water supply pump (22). The outlet of the thermal storage unit water inlet pipe (3) is divided into two paths. One path is connected to the inlet of the modular molten salt energy storage unit (9) via the normal water supply valve (2) of the energy storage unit. The other path is connected to the inlet of the outer solid thermal storage insulation structure (10) via the cold start insulation layer water inlet valve (4) and the insulation layer water inlet pipe (6). The outlet of the outer solid thermal storage insulation structure (10) is connected to the inlet of the modular molten salt energy storage unit (9) via the insulation layer water outlet pipe (5). The outlet of the modular molten salt energy storage unit (9) is connected to the energy storage device steam generation pipe (12) via the energy storage unit steam generation pipe valve (7) and the energy storage unit steam generation pipe (8).

6. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 5, characterized in that, The outlet of the modular molten salt energy storage unit (9) is connected to the steam production pipeline (12) of the energy storage device via the steam production pipeline valve (7) of the energy storage unit and the steam production pipeline (8) of the energy storage unit.

7. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 5, characterized in that, The outlet of the outer solid thermal insulation structure (10) is connected to the inlet of the modular molten salt energy storage unit (9) via the insulation layer water outlet pipe (5) and the cold start insulation layer water outlet valve (1).

8. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 5, characterized in that, The energy storage units are connected in parallel.

9. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 5, characterized in that, The outer solid thermal insulation structure (10) is located on the outside of the modular molten salt energy storage unit (9).

10. The system for coupling a modular molten salt energy storage device with solid energy storage and insulation according to claim 1, characterized in that, When the associated unit is in operation and there is industrial steam supply, steam is supplied to the deaerator (21) through the industrial steam supply header (16) to heat and deoxygenate the demineralized water. When the associated unit is in operation and there is no industrial steam supply, the demineralized water is heated and deoxygenated through the auxiliary steam header (18) of the associated unit, and the generated steam is added to the auxiliary steam header (18) of the associated unit.

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