Integrated solid electric heat storage device based on molten salt heat storage and use method

Abstract

Provided in the present application are an integrated solid electric heat storage device based on molten salt heat storage and a use method. The device comprises flow channels, a circulation pipe, solid heat storage blocks, a heat exchanger and a molten salt pump; the plurality of flow channels are arranged in parallel, each of the flow channels containing molten salt; output ends of the flow channels are all connected to a first end of the circulation pipe, and input ends of the flow channels are all connected to a second end of the circulation pipe; the plurality of solid heat storage blocks are arranged in the molten salt in each of the flow channels; the heat exchanger and the molten salt pump are arranged on the circulation pipe; the molten salt pump is located on the side of the heat exchanger away from the output ends of the flow channels, and is used for providing power for the circulation of the liquid molten salt between the flow channels and the circulation pipe, wherein the liquid molten salt releases heat in the heat exchanger. The present application has one technical effect of reasonable design, thus improving heat transfer efficiency while significantly reducing investment costs.

Description

Integrated solid electric heat storage device based on molten salt heat storage and use method

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411290820.9, filed on September 14, 2024, and entitled "Integrated solid electric heat storage device based on molten salt heat storage and use method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of energy storage, and specifically relates to an integrated solid electric heat storage device based on molten salt heat storage and a use method thereof. BACKGROUND

[0004] The significance of energy storage technology lies in changing the mode of synchronous completion of power generation, transmission and use, and realizing the time-dimension staggered use of energy. The energy storage system can realize the functions of smoothing the fluctuation of energy, shaving peak and filling valley, etc., and suppresses the fluctuation of power grid frequency by instantaneously balancing the difference between load and power generation. Solid electric heat storage boiler and molten salt heat storage technology are conventional large-scale energy storage technologies, which have been widely used in engineering. The solid electric heat storage boiler energy storage process converts electric energy into sensible heat storage of solid heat storage blocks, and the heat release process uses air to take away heat to heat feed water, which can directly work at voltage levels of 66kV / 35kV / 10kV, etc. Although the heat storage temperature of the solid heat storage block can reach more than 600℃, the heat release temperature is only 80℃-130℃ due to the low thermal conductivity of air, resulting in a large loss of energy quality.

[0005] Therefore, there is an urgent need for an integrated solid electric heat storage device based on molten salt heat storage and a use method thereof to improve the heat transfer efficiency while reducing the investment cost. SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art, and provides a new technical solution of an integrated solid electric heat storage device based on molten salt heat storage and a use method thereof.

[0007] According to a first aspect of the present application, an integrated solid electric heat storage device based on molten salt heat storage is provided, comprising:

[0008] a flow channel and a circulation pipeline, a plurality of flow channels are arranged in parallel, and each flow channel is filled with molten salt; the output end of each flow channel is connected with the first end of the circulation pipeline, and the input end of each flow channel is connected with the second end of the circulation pipeline;

[0009] Solid heat storage blocks, a plurality of solid heat storage blocks are arranged in the molten salt in each flow channel, and each solid heat storage block is used for converting electrical energy into heat energy and storing in the molten salt;

[0010] A heat exchanger and a molten salt pump, the heat exchanger and the molten salt pump are arranged in the circulation pipeline, and the molten salt pump is located on the side of the heat exchanger away from the output end of the flow channel, and the molten salt pump is used to provide power for the circulation of the liquid molten salt between the flow channel and the circulation pipeline; wherein the liquid molten salt is cooled in the heat exchanger.

[0011] Optionally, the solid heat storage block comprises a metal shell, a heat storage filler and a resistance wire;

[0012] The inside of the metal shell is filled with a heat storage filler, and the inside of the heat storage filler is provided with a resistance wire;

[0013] The resistance wire is powered to convert electrical energy into heat energy and deliver to the heat storage filler, and the heat storage filler is used for storing heat and can transmit heat energy to the molten salt outside the metal shell through the metal shell.

[0014] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a power regulator and a power grid;

[0015] Each solid heat storage block is electrically connected with the power grid through the power regulator.

[0016] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises an output pipeline, an input pipeline, an outlet isolation valve and an inlet isolation valve;

[0017] The output end of each flow channel is connected with the first end of the circulation pipeline through the output pipeline, and the outlet isolation valve is arranged in the output pipeline;

[0018] The input end of each flow channel is connected with the second end of the circulation pipeline through the input pipeline, and the inlet isolation valve is arranged in the input pipeline.

[0019] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a first temperature measuring element;

[0020] A first temperature measuring element is arranged on each output pipeline, and the first temperature measuring element is used for measuring the temperature of the molten salt at the output end of the flow channel.

[0021] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a second temperature measuring element;

[0022] The second temperature measuring element is arranged in the metal shell, and the second temperature measuring element is used for measuring the temperature of the solid heat storage block.

[0023] Optionally, each of the flow channels is located at the lowest part of the integrated solid electrothermal storage device.

[0024] Optionally, the integrated solid electrothermal storage device based on molten salt heat storage further comprises a first branch pipe, a second branch pipe, a bypass valve and an adjusting valve.

[0025] The second end of the circulation pipe has two ports, one of which is connected to the input pipe through the first branch pipe, and the other of which is connected to the input pipe through the second branch pipe.

[0026] The adjusting valve is arranged in the first branch pipe, and the bypass valve is arranged in the second branch pipe.

[0027] According to a second aspect of the present application, a use method of an integrated solid electrothermal storage device based on molten salt heat storage is provided, which uses the integrated solid electrothermal storage device based on molten salt heat storage as described in the first aspect, and comprises the following steps:

[0028] During the off-peak period of electricity, the power regulator is used to increase the electricity load to convert the surplus electricity of the power grid into solid heat storage blocks and molten salt sensible heat storage; wherein the surplus electricity of the power grid flows through the solid heat storage blocks and is converted into heat, and as the temperature of the solid heat storage blocks gradually rises, the temperature of the molten salt inside the flow channels also rises and forms high-temperature molten salt;

[0029] During the peak period of electricity, the power regulator is used to reduce the electricity load or stop electricity, and the stored high-temperature molten salt is used to heat the feed water through the heat exchanger to generate steam, which is used to do work or supply steam outside; wherein first, each inlet isolation valve, each outlet isolation valve and the adjusting valve are opened, and the bypass valve is closed, and the molten salt pump is started to pump out the high-temperature molten salt inside the flow channels; second, the high-temperature molten salt enters the heat exchanger to release heat and form low-temperature molten salt, which sequentially passes through the adjusting valve, the inlet isolation valve and is circulated into the flow channels.

[0030] Optionally, the use method of the integrated solid electrothermal storage device based on molten salt heat storage further comprises:

[0031] During the shutdown of the system, each inlet isolation valve and each outlet isolation valve is opened, and the adjusting valve is closed, and the molten salt in the circulation pipe and the heat exchanger flows back to the flow channels under the action of gravity.

[0032] One technical effect of the present application is that:

[0033] In the embodiments of the present application, solid heat storage blocks are used as the main heat storage medium, and molten salt is used as the heat exchange medium, which not only plays the low-cost advantage of solid heat storage, but also greatly improves the heat transfer efficiency compared with air as the heat exchange medium. At the same time, the integrated solid electric heat storage device based on molten salt heat storage can reduce the amount of molten salt used and avoid the use of anti-condensation equipment (electric heat tracing, electric heater, etc.), which helps to reduce the operating cost.

[0034] In addition, the integrated solid electric heat storage device based on molten salt heat storage has the advantages of large scale, long time, low cost and modularity, which can assist the power grid in peak shaving and valley filling and improve the level of new energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0035] FIG. 1 is a structural schematic diagram of an integrated solid electric heat storage device based on molten salt heat storage according to an embodiment of the present application;

[0036] FIG. 2 is a structural schematic diagram of a solid heat storage block of an integrated solid electric heat storage device based on molten salt heat storage according to an embodiment of the present application;

[0037] FIG. 3 is a cross-sectional schematic diagram of a solid heat storage block of an integrated solid electric heat storage device based on molten salt heat storage according to an embodiment of the present application.

[0038] In the figure: 1, flow channel; 2, circulating pipeline; 3, molten salt; 4, solid heat storage block; 41, metal shell; 42, heat storage filler; 43, resistance wire; 5, heat exchanger; 6, molten salt pump; 7, power regulator; 8, power grid; 9, output pipeline; 10, input pipeline; 11, outlet isolation valve; 12, inlet isolation valve; 13, first temperature measuring element; 14, second temperature measuring element; 15, first branch pipe; 16, second branch pipe; 17, bypass valve; 18, regulating valve. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0040] The embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0041] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] According to the first aspect of the present application, referring to FIGS. 1-3, an integrated solid heat storage device based on molten salt heat storage is provided, comprising:

[0045] Flow channels 1 and circulating pipes 2, a plurality of flow channels 1 are arranged in parallel, and each of the flow channels 1 is filled with molten salt 3, i.e. the molten salt 3 stays in the flow channel 1 for a long time; the output end of each flow channel 1 is connected with the first end of the circulating pipe 2, and the input end of each flow channel 1 is connected with the second end of the circulating pipe 2;

[0046] Solid heat storage blocks 4, a plurality of solid heat storage blocks 4 are arranged in the molten salt 3 in each flow channel 1, and each solid heat storage block 4 is used to convert electrical energy into heat energy and store it in the molten salt, i.e. when the temperature of the solid heat storage block 4 rises, the molten salt 3 absorbs the heat of the solid heat storage block 4 and the temperature rises;

[0047] A heat exchanger 5 and a molten salt pump 6 are arranged in the circulating pipeline 2, and the molten salt pump 6 is located on the side of the heat exchanger 5 away from the output end of the flow channel 1, and is used to provide power for the circulation of the liquid molten salt 3 between the flow channel 1 and the circulating pipeline 2; wherein the liquid molten salt 3 is discharged in the heat exchanger 5.

[0048] In the embodiment of the present application, the solid heat storage block 4 is used as the main heat storage medium, and the molten salt 3 is used as the heat exchange medium, which not only has the low-cost advantage of solid heat storage, but also greatly improves the heat transfer efficiency compared with air as the heat exchange medium. At the same time, the integrated solid electric heat storage device based on molten salt heat storage can reduce the amount of molten salt 3 and avoid the use of anti-condensation equipment (electric heat tracing, electric heater, etc.), which helps to reduce the operating cost.

[0049] In addition, the integrated solid electric heat storage device based on molten salt heat storage has the advantages of large scale, long time, low cost and modularity, which can assist the power grid 8 to reduce peak load and improve new energy consumption level.

[0050] Optionally, the solid heat storage block 4 comprises a metal shell 41, a heat storage filler 42 and a resistance wire 43; for example, the heat storage filler 42 can be an insulation-heat storage filler, and the material is magnesium oxide;

[0051] The inside of the metal shell 41 is filled with the heat storage filler 42, and the inside of the heat storage filler 42 is provided with the resistance wire 43;

[0052] The resistance wire 43 is electrified to convert electrical energy into heat energy and deliver it to the heat storage filler 42, and the heat storage filler 42 is used for heat storage and can transmit heat energy to the molten salt outside the metal shell 41 through the metal shell 41.

[0053] In the above embodiment, the solid heat storage block 4 has a reasonable structure, can effectively store the heat energy converted from electrical energy, and can transmit the heat energy to the molten salt to realize heat exchange through the molten salt.

[0054] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a power regulator 7 and a power grid 8;

[0055] Each of the solid heat storage blocks 4 is electrically connected to the power grid 8 through the power regulator 7.

[0056] In the above embodiment, the internal resistance of the solid heat storage block 4 is electrically connected to the power regulator 7 through the cable, and the power regulator 7 is connected to the power grid 8. Then the surplus power of the power grid 8 flows through the resistance wire 43 through the power regulator 7, and the current generates heat when flowing through the resistance wire 43, and the heat is stored in the heat storage filler 42.

[0057] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises output pipes 9, input pipes 10, an outlet isolation valve 11 and an inlet isolation valve 12.

[0058] The output end of each flow channel 1 is connected to the first end of the circulation pipe 2 through an output pipe 9, and the outlet isolation valve 11 is arranged on the output pipe 9.

[0059] The input end of each flow channel 1 is connected to the second end of the circulation pipe 2 through an input pipe 10, and the inlet isolation valve 12 is arranged on the input pipe 10.

[0060] In the above embodiment, the output end of each flow channel 1 is connected to the first end of the circulation pipe 2 through an output pipe 9, and the input end of each flow channel 1 is connected to the second end of the circulation pipe 2 through an input pipe 10, so that the connection of each flow channel 1 and the circulation pipe 2 is relatively simple.

[0061] In addition, the molten salt in the flow channel 1 can be effectively isolated by the outlet isolation valve 11 and the inlet isolation valve 12.

[0062] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a first temperature measuring element 13.

[0063] A first temperature measuring element 13 is arranged on each output pipe 9, and the first temperature measuring element 13 is used to measure the temperature of the molten salt at the output end of the flow channel 1.

[0064] In the above embodiment, the temperature of the molten salt at the output end of the flow channel 1 can be measured in real time by the first temperature measuring element 13 to avoid over-temperature of the molten salt, thereby ensuring safe and stable operation of the integrated solid electric heat storage device based on molten salt heat storage.

[0065] For example, by observing the temperature of the molten salt at the output end of the flow channel 1 measured by each first temperature measuring element 13, the speed of the molten salt pump 6 can be adjusted in time to change the flow of the molten salt 3, thereby ensuring stable temperature of the molten salt 3 at the output end of the flow channel 1.

[0066] Optionally, the integrated solid electric heat storage device based on molten salt heat storage further comprises a second temperature measuring element 14.

[0067] The second temperature measuring element 14 is arranged on the metal shell 41, and the second temperature measuring element 14 is used to measure the temperature of the solid heat storage block 4. For example, the second temperature measuring element 14 is used to measure whether the temperature of the solid heat storage block 4 is over-temperature.

[0068] In the above embodiment, the temperature of the solid heat storage block 4 can be measured in real time by the second temperature measuring element 14 to avoid over-temperature of the solid heat storage block 4, thereby ensuring safe and stable operation of the solid heat storage block 4.

[0069] Optionally, each of the flow channels 1 is located at the lowest point of the integrated solid electro-thermal storage device. This enables the liquid molten salt in the heat exchanger 5 and the circulating pipeline 2 to flow back into the flow channels 1 under the action of gravity.

[0070] Optionally, the integrated solid electro-thermal storage device based on molten salt heat storage further comprises a first branch pipe 15, a second branch pipe 16, a bypass valve 17 and an adjusting valve 18.

[0071] The second end of the circulating pipeline 2 has two ports, one of which is connected to the input pipeline 10 through the first branch pipe 15, and the other of which is connected to the input pipeline 10 through the second branch pipe 16.

[0072] The adjusting valve 18 is arranged in the first branch pipe 15, and the bypass valve 17 is arranged in the second branch pipe 16.

[0073] In the above embodiment, in the shutdown state, the liquid molten salt in the heat exchanger 5 and the circulating pipeline 2 can flow back into the flow channels 1 through the second branch pipe 16. During the pumping of the molten salt pump 6, the bypass valve 17 is in a closed state, and the flow of the liquid molten salt in the first branch pipe 15 is adjusted by the adjusting valve 18.

[0074] It should be noted that the state of the molten salt in the integrated solid electro-thermal storage device based on molten salt heat storage is always liquid. For example, each of the flow channels 1 is located at the lowest point of the integrated solid electro-thermal storage device, and when the integrated solid electro-thermal storage device is shut down, the molten salt in the integrated solid electro-thermal storage device will flow into the flow channels 1. At the same time, the outside of the flow channels 1 is provided with a heat preservation and heating layer, which can also heat and preserve the molten salt inside the flow channels 1 when the temperature of the molten salt decreases.

[0075] In a specific embodiment, the solid heat storage block converts electrical energy into heat energy in real time, and also has a heat storage function. When the integrated solid electro-thermal storage device only heats and does not release heat, the molten salt does not flow, and the main functions of the solid heat storage block and the molten salt in the flow channels 1 are both heat storage.

[0076] According to a second aspect of the present application, a use method of an integrated solid electro-thermal storage device based on molten salt heat storage is provided, which uses the integrated solid electro-thermal storage device based on molten salt heat storage as described in the first aspect, and comprises:

[0077] During the power valley, the power load is increased by the power regulator 7 to convert the power surplus of the power grid 8 into the sensible heat storage of the solid heat storage block 4 and the molten salt 3; wherein the power surplus of the power grid 8 flows through the solid heat storage block 4 and is converted into heat, and the temperature of the solid heat storage block 4 gradually rises, and the temperature of the molten salt 3 in the flow channel 1 also rises and forms high-temperature molten salt;

[0078] During the power peak, the power load is reduced or stopped by the power regulator 7, and the stored high-temperature molten salt 3 is used to heat the feed water through the heat exchanger 5 to generate steam, and the steam is used to do work or supply steam; wherein first, each inlet isolation valve 12, each outlet isolation valve 11 and the regulating valve 18 are opened, the bypass valve 17 is closed, and the molten salt pump 6 is started to pump the high-temperature molten salt in the flow channel 1; second, the high-temperature molten salt 3 enters the heat exchanger 5 to release heat and form low-temperature molten salt, and the low-temperature molten salt sequentially passes through the regulating valve 18 and the inlet isolation valve 12 and is circulated into the flow channel 1.

[0079] In the above embodiment, the use method of the integrated solid electrical heat storage device based on molten salt heat storage is reasonable in design, the solid heat storage block 4 is used as the main heat storage medium, and the molten salt 3 is used as the heat exchange medium, which not only takes advantage of the low cost of solid heat storage, but also greatly improves the heat transfer efficiency compared to air as the heat exchange medium. At the same time, the integrated solid electrical heat storage device based on molten salt heat storage can reduce the amount of molten salt 3 and avoid the use of anti-condensation equipment (electric heat tracing, electric heater, etc.), which helps to reduce the operating cost.

[0080] Optionally, the use method of the integrated solid electrical heat storage device based on molten salt heat storage further comprises:

[0081] During the system shutdown, that is, neither heat storage nor heat release, each inlet isolation valve 12 and each outlet isolation valve 11 are opened, and the regulating valve 18 is closed, and the molten salt 3 in the circulating pipeline 2 and the heat exchanger 5 flows back to the flow channel 1 under the action of gravity to prevent the molten salt 3 from staying in the circulating pipeline 2 and the heat exchanger 5 for a long time and solidifying.

[0082] In the above embodiment, the molten salt 3 in the circulating pipeline 2 and the heat exchanger 5 flows back to the flow channel 1 under the action of gravity during the system shutdown, which better ensures the safety of the system.

[0083] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. An integrated solid electrothermal storage device based on molten salt heat storage, characterized by, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

2. The integrated solid electrothermal storage based on molten salt heat storage according to claim 1, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

3. The integrated solid electrothermal storage based on molten salt heat storage according to claim 2, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

4. The integrated solid electrothermal storage based on molten salt heat storage according to claim 3, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

5. The integrated solid electrothermal storage based on molten salt heat storage according to claim 4, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

6. The integrated solid electrothermal storage based on molten salt heat storage according to claim 5, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

7. The integrated solid electrothermal storage based on molten salt heat storage according to claim 6, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

8. The integrated solid electrothermal storage based on molten salt heat storage according to claim 7, characterized in that, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage.

9. A method of using an integrated solid electrothermal storage device based on molten salt thermal storage, characterized by, The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. The application relates to an integrated solid electric heat storage device based on molten salt heat storage. 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10. The method of using the integrated solid electrothermal storage device based on molten salt heat storage according to claim 9, characterized in that, Also includes: During the system shutdown, open each inlet isolation valve and each outlet isolation valve, close the regulating valve, and the molten salt in the circulating pipeline and the heat exchanger flows back to the flow channel under the action of gravity.

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