Heat storage and exchange device and heat storage control method

Abstract

The invention provides a heat storage and exchange device and a heat storage control method.The heat storage and exchange device comprises a partition plate arranged in a containing cavity, the partition plate divides the containing cavity into a first cavity and a second cavity, one side of the partition plate and the inner surface of a heat preservation shell are arranged in a spaced mode, and an overflowing gap is formed to communicate the first cavity with the second cavity; the heat exchanger comprises a medium output channel and a medium input channel, the medium output channel communicates with the first cavity through an inlet, and the medium input channel communicates with the second cavity through an outlet; a part of the phase-change heat exchange piece is arranged in the first cavity and located between the inlet and the overflowing gap, a part of the phase-change heat exchange piece is arranged in the second cavity and located between the outlet and the overflowing gap, and a heat exchange medium sequentially flows through the inlet and the phase-change heat exchange piece located in the first cavity. And the overflowing gap is located in the phase-change heat exchange piece in the second cavity. According to the technical scheme, the problem that in the related technology, heat exchange of a heat exchange medium is not sufficient enough can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of heat storage and exchange technology, and in particular to a heat storage and exchange device and a heat storage control method. Background Art

[0002] Thermal storage technologies usually include sensible heat storage, latent heat storage (these two are thermophysical heat storage) and thermochemical heat storage. Among them, sensible heat storage uses the temperature rise of high specific heat capacity materials to store heat, and the energy storage density is 30-80kWh / m 3 The storage method is simple and the energy storage cost is low, but the system volume is too large and the heat loss is serious. Latent heat storage uses the phase change of materials to store heat, and the energy storage density is 83-140kWh / m 3 .

[0003] At present, commonly used heat storage technologies include solid heat storage (sensible heat), water heat storage (sensible heat), phase change heat storage (latent heat + sensible heat), etc. Among them, water heat storage has the lowest cost, solid heat storage has medium cost, and phase change heat storage has a higher cost. Medium and high temperature metal phase change materials have the characteristics of high heat storage density and high thermal conductivity. Their main advantages are as follows: 1. The thermal conductivity is dozens of times that of traditional phase change materials, which is conducive to the rapid response of the system to charge and release heat; 2. The metal density is large, the unit volume phase change latent heat is high, and the phase change temperature is high. Therefore, high sensible heat and high phase change latent heat make the energy storage density high, which is conducive to the design of compact heat storage devices. Due to its above characteristics, heat storage devices based on metal phase change materials can solve the problems of low heat storage density and low charging and discharging power of traditional heat storage devices.

[0004] During the heat release process of the heat storage device, the heat exchange between the heat exchange medium and the metal phase change material is often insufficient, resulting in a low heating efficiency of the heat exchange medium for the heated material. Summary of the invention

[0005] The main purpose of the present invention is to provide a heat storage and exchange device and a heat storage control method to solve the problem of insufficient heat exchange of heat exchange medium in the related art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a heat storage and exchange device is provided, comprising: a heat-insulating shell having a accommodating chamber, the heat-insulating shell comprising an inlet and an outlet connected to the accommodating chamber; a partition plate arranged in the accommodating chamber, the partition plate is connected to the inner surface of the heat-insulating shell and separates the accommodating chamber into a first chamber and a second chamber, one side of the partition plate is spaced from the inner surface of the heat-insulating shell and forms a flow gap to connect the first chamber and the second chamber; a heat exchanger is arranged on the heat-insulating shell, the heat exchanger comprises a medium output channel and a medium input channel, the medium output channel is connected to the first chamber through the inlet and enables the heat exchanger to The medium can enter into the first chamber, and the medium input channel is connected with the second chamber through the outlet so that the heat exchange medium can enter into the medium input channel; the phase change heat element is arranged in the accommodating chamber so that the heat exchange medium can exchange heat with the phase change heat element, and there are multiple phase change heat elements, some of which are arranged in the first chamber and located between the inlet and the flow gap, and some of which are arranged in the second chamber and located between the outlet and the flow gap. The heat exchange medium flows through the inlet, the phase change heat element in the first chamber, the flow gap, the phase change heat element in the second chamber and the outlet in sequence.

[0007] Furthermore, the phase change heat exchange element is a cylindrical structure, a square column structure or a flat column structure, and a plurality of phase change heat exchange elements are arranged at intervals along an extension direction parallel to the first chamber or at intervals perpendicular to the extension direction of the first chamber.

[0008] Furthermore, an electric heating wire is arranged inside the phase-change heat element, wherein the power input end and the power output end of the electric heating wire are both arranged at the first end of the phase-change heat element, and the electric heating wire has a bending portion, which is located at the second end of the phase-change heat element; or, the power input end of the electric heating wire is arranged at the first end of the phase-change heat element, and the power output end of the electric heating wire is arranged at the second end of the phase-change heat element.

[0009] Further, in the first chamber, the phase change heat exchange element is a plate-like structure, a plurality of phase change heat exchange elements are arranged at intervals, a flow channel is formed between two adjacent phase change heat exchange elements, and both ends of the flow channel are respectively connected to the inlet and the flow gap.

[0010] Furthermore, a first terminal and a second terminal are provided on the thermal insulation outer shell, and the phase change heating element includes an outer shell, an inner shell and an insulating support member. The inner shell is located inside the outer shell, and an electric heating element is provided inside the inner shell. There are multiple insulating support members, and the multiple insulating support members are arranged at intervals inside the inner shell and support and cooperate with the electric heating element. The two ends of the electric heating element are conductively connected to the first terminal and the second terminal respectively, and a metal phase change filler is provided between the inner surface of the outer shell and the outer surface of the inner shell.

[0011] Furthermore, the heat storage and exchange device also includes a first conductive member and a second conductive member. In the direction from the inlet to the flow gap, the first conductive member and the second conductive member are located on both sides of the phase change heat exchange element. The first conductive member is conductively connected to the first terminal, and the second conductive member is conductively connected to the second terminal. One end of the electric heating element of each phase change heat exchange element is conductively connected to the first conductive member, and the other end is conductively connected to the second conductive member.

[0012] Furthermore, the first terminal and the second terminal are both located on a side of the phase change heat exchanger away from the current gap, and a conductive connector is provided in the partition, and the conductive connector is conductively connected between the second terminal and the second conductive member.

[0013] Furthermore, the metal phase change filler is made of one or more of aluminum metal, germanium metal, magnesium metal, zinc metal or nickel metal; or, the metal phase change filler is made of one or more of aluminum-based alloy, germanium-based alloy, magnesium-based alloy, zinc-based alloy or nickel-based alloy.

[0014] Furthermore, the heat storage and exchange device includes heat exchange fins arranged in the flow passage, and at least one phase change heat exchange element is thermally connected to the heat exchange fins.

[0015] According to another aspect of the present invention, a heat storage control method is provided for controlling the above-mentioned heat storage and exchange device, and the heat storage control method comprises: monitoring the grid load, when the grid load is less than or equal to a first preset value, the electric heating element is started, and when the grid load is greater than or equal to the first preset value, the electric heating element stops working; monitoring the heating time of the electric heating element, when the heating time is greater than or equal to a second preset value, starting the heat exchanger to allow the heat exchange medium to exchange heat with the phase change heat storage component.

[0016] According to the technical solution of the present invention, a heat-insulating shell has a accommodating cavity, the heat-insulating shell includes an inlet and an outlet connected to the accommodating cavity, a partition is arranged in the accommodating cavity, the partition separates the accommodating cavity into a first chamber and a second chamber, the partition is spaced apart from the inner surface of the heat-insulating shell and forms a flow gap, the flow gap connects the first chamber and the second chamber, the heat exchanger can enable a heat exchange medium to heat a substance to be heated, the heat exchanger includes a medium output channel and a medium input channel, the medium output channel is connected to the first chamber through the inlet, and the medium input channel is connected to the second chamber through the outlet, thereby forming a flow path in which the heat exchange medium enters the first chamber from the inlet, then flows through the flow gap and the second chamber, and finally flows into the heat exchanger through the outlet, a plurality of phase change heat exchange components are arranged in the accommodating cavity so that the heat exchange medium can heat the substance to be heated with the phase change heat exchange component. Part of the phase change heat exchange element is arranged in the first chamber and is located between the inlet and the flow gap, and part of the phase change heat exchange element is arranged in the second chamber and is located between the outlet and the flow gap. When the phase change heat exchange element heats the heat exchange medium, the heat exchange medium with lower energy flows through the inlet, the phase change heat exchange element in the first chamber, the flow gap, the phase change heat exchange element in the second chamber and the outlet in sequence, so that it is heated by the phase change heat exchange element for many times and becomes a heat exchange medium with higher energy, and then the heat exchange medium with higher energy heats the heated material through the heat exchanger, and then becomes a heat exchange medium with lower energy again. Such an arrangement can make the heat exchange medium flow along a longer path in the accommodating chamber, and exchange heat with the phase change heat exchange element for many times, so that the heat exchange medium can fully exchange heat and improve the heat exchange efficiency. Therefore, the technical solution of the present application can effectively solve the problem of insufficient heat exchange of heat exchange medium in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A cross-sectional schematic diagram of a first embodiment of a heat storage and exchange device according to the present invention is shown;

[0019] Figure 2 Shows Figure 1 A schematic top view of a first phase change heat transfer element and a flow channel plate of a heat storage and exchange device;

[0020] Figure 3 Shows Figure 1 A cross-sectional schematic diagram of a first phase-change heat transfer element of a heat storage and exchange device;

[0021] Figure 4 Shows Figure 1 A schematic diagram of the principle of a first terminal, a second terminal, a first conductive member, a second conductive member and a conductive connecting member of a heat storage and exchange device;

[0022] Figure 5 A cross-sectional schematic diagram of a second embodiment of a heat storage and exchange device according to the present invention is shown;

[0023] Figure 6 A flow chart showing an embodiment of a thermal storage control method according to the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Insulation shell; 11. Accommodation chamber; 111. First chamber; 112. Second chamber; 113. Flow gap; 12. Inlet; 13. Outlet;

[0026] 20. Partition;

[0027] 30. Heat exchanger;

[0028] 40. phase change heating element; 411. outer shell; 412. inner shell; 413. electric heating element; 414. metal phase change filler; 43. flow passage;

[0029] 50. flow channel plate; 51. flow channel gap; 52. first flow channel plate; 53. second flow channel plate;

[0030] 61. First terminal; 62. Second terminal; 63. First conductive member; 64. Second conductive member; 65. Conductive connecting member. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] like Figure 1 As shown, the present application provides a heat storage and exchange device. The first embodiment of the heat storage and exchange device of the present application includes: a heat preservation shell 10, a partition 20, a heat exchanger 30, and a phase change heat exchange element 40; the heat preservation shell 10 has a accommodating chamber 11, and the heat preservation shell 10 includes an inlet 12 and an outlet 13 connected to the accommodating chamber 11; the partition 20 is arranged in the accommodating chamber 11, the partition 20 is connected to the inner surface of the heat preservation shell 10 and separates the accommodating chamber 11 into a first chamber 111 and a second chamber 112, one side of the partition 20 is spaced from the inner surface of the heat preservation shell 10 and forms a flow gap 113 to connect the first chamber 111 and the second chamber 112; the heat exchanger 30 is arranged on the heat preservation shell 10, and the heat exchanger 30 includes a medium output channel and a medium input channel, and the medium output channel is connected to the first chamber 111 through the inlet 12. The chambers 111 are connected so that the heat exchange medium can enter the first chamber 111. The medium input channel is connected to the second chamber 112 through the outlet 13 and the heat exchange medium can enter the medium input channel. The phase change heat element 40 is arranged in the accommodating chamber 11 so that the heat exchange medium can exchange heat with the phase change heat element 40. There are multiple phase change heat elements 40. Some of the phase change heat elements 40 are arranged in the first chamber 111 and are located between the inlet 12 and the flow gap 113. Some of the phase change heat elements 40 are arranged in the second chamber 112 and are located between the outlet 13 and the flow gap 113. The heat exchange medium flows through the inlet 12, the phase change heat element 40 located in the first chamber 111, the flow gap 113, the phase change heat element 40 located in the second chamber 112 and the outlet 13 in sequence.

[0035] According to the technical solution of the present embodiment, a heat-insulating shell 10 has a housing chamber 11, and the heat-insulating shell 10 includes an inlet 12 and an outlet 13 connected to the housing chamber 11. A partition 20 is arranged in the housing chamber 11, and the partition 20 separates the housing chamber 11 into a first chamber 111 and a second chamber 112. The partition 20 is spaced apart from the inner surface of the heat-insulating shell 10 to form a flow gap 113, and the flow gap 113 connects the first chamber 111 and the second chamber 112. The heat exchanger 30 can heat the material to be heated by the heat exchange medium. The heat exchanger 30 includes a medium output channel and a medium input channel. The medium output channel is connected to the first chamber 111 through the inlet 12, and the medium input channel is connected to the second chamber 112 through the outlet 13, thereby forming a flow path in which the heat exchange medium enters the first chamber 111 from the inlet 12, flows through the flow gap 113 and the second chamber 112, and finally flows into the heat exchanger 30 through the outlet 13. A plurality of phase change heat exchange elements 40 are arranged in the housing chamber 11 to heat the material to be heated. The heat exchange medium can exchange heat with the phase change heat element 40. Part of the phase change heat element 40 is arranged in the first chamber 111 and is located between the inlet 12 and the flow gap 113. Part of the phase change heat element 40 is arranged in the second chamber 112 and is located between the outlet 13 and the flow gap 113. When the phase change heat element 40 heats the heat exchange medium, the heat exchange medium with lower energy flows through the inlet 12, the phase change heat element 40 located in the first chamber 111, the flow gap 113, the phase change heat element 40 located in the second chamber 112 and the outlet 13 in sequence, so that it is heated by the phase change heat element 40 for many times and becomes a heat exchange medium with higher energy, and then the heat exchange medium with higher energy heats the heated material through the heat exchanger 30, and then becomes a heat exchange medium with lower energy. Such a configuration can make the heat exchange medium flow along a longer path in the accommodating chamber 11, and exchange heat with the phase change heat element 40 for many times, so that the heat exchange medium can fully exchange heat, thereby improving the heat exchange efficiency. Therefore, the technical solution of this embodiment can effectively solve the problem of insufficient heat exchange of the heat exchange medium in the related art.

[0036] It should be noted that, in this embodiment, the heat exchange medium is air.

[0037] like Figure 1 as well as Figure 2As shown, in the first chamber 111, the phase change heat element 40 is a plate-like structure, and a plurality of phase change heat elements 40 are arranged at intervals. A flow channel 43 is formed between two adjacent phase change heat elements 40, and the two ends of the flow channel 43 are respectively connected to the inlet 12 and the flow gap 113. Specifically, the phase change heat element 40 with a plate-like structure can have a larger contact surface with the heat exchange medium, thereby ensuring sufficient heat exchange of the heat exchange medium. The plurality of phase change heat elements 40 can also ensure the heat exchange efficiency of the heat exchange medium. The arrangement of the flow channel 43 enables the heat exchange medium to flow through the flow channel 43, thereby obtaining that the heat exchange medium can exchange heat with the phase change heat element 40. This embodiment mainly describes the phase change heat element 40 in the first chamber 111. The phase change heat element 40 in the second chamber 112 also has a similar structure and function.

[0038] like Figure 1 as well as Figure 2 As shown, the heat storage and exchange device further includes a plurality of flow channel plates 50, which are arranged in the flow channel 43 at intervals along the extension direction of the flow channel 43, and a flow channel gap 51 is formed between each flow channel plate 50 and a side wall of the flow channel 43, and the flow gaps 113 between each two adjacent flow channel plates 50 and the flow channel 43 do not overlap. Specifically, the plurality of flow channel plates 50 are arranged in the flow channel 43 at intervals along the extension direction of the flow channel 43, and the flow gaps 113 between each two adjacent flow channel plates 50 and the flow channel 43 do not overlap, so that the flow path of the heat exchange medium in the flow channel 43 is further increased, thereby making the heat exchange of the heat exchange medium more sufficient.

[0039] like Figure 1 as well as Figure 2 As shown, the flow passage 43 includes a first side wall and a second side wall that are arranged opposite to each other, and two adjacent flow channel plates 50 form a flow gap 113 with the first inner wall and the second inner wall, respectively. In this embodiment, the first side wall and the second side wall that are arranged opposite to each other of the flow passage 43 are respectively Figure 1 The two opposite inner surfaces of the middle heat-insulating outer shell 10 parallel to the paper surface (respectively the first inner surface and the second inner surface, Figure 2 The first inner surface and the second inner surface are located on the upper and lower sides), one end of one of the two adjacent flow channel plates 50 is connected to the first inner surface, and the other end is spaced apart from the second inner surface, one end of the other of the two adjacent flow channel plates 50 is connected to the second inner surface, and the other end is spaced apart from the first inner surface, that is, two adjacent flow gaps 113 are respectively formed between the flow channel plate 50 and the first inner surface and between the flow channel plate 50 and the second inner surface, so that the flow path of the heat exchange medium forms an S shape, thereby making the flow path of the heat exchange medium longer.

[0040] like Figure 1 as well as Figure 2 As shown, the plurality of flow channel plates 50 include a first flow channel plate 52 and a second flow channel plate 53. The first flow channel plate 52 is spaced apart from the first inner wall, the second flow channel plate 53 is spaced apart from the second inner wall, and the first flow channel plate 52 and the second flow channel plate 53 are alternately arranged. Such an arrangement further increases the above-mentioned S-shaped flow path, so that the heat exchange medium can fully exchange heat with the phase change heat exchange element 40.

[0041] like Figure 3 As shown, the heat-insulating outer shell 10 is provided with a first terminal 61 and a second terminal 62, and the phase-change heat element 40 includes an outer shell 411, an inner shell 412 and an insulating support member, the inner shell 412 is located inside the outer shell 411, and an electric heating element 413 is provided inside the inner shell 412, there are multiple insulating support members, and the multiple insulating support members are arranged at intervals inside the inner shell 412 and support and cooperate with the electric heating element 413, and the two ends of the electric heating element 413 are respectively conductively connected to the first terminal 61 and the second terminal 62, and a metal phase-change filler 414 is provided between the inner surface of the outer shell 411 and the outer surface of the inner shell 412. Specifically, the electric heating element 413 can heat the metal phase-change filler 414, so that the metal phase-change filler 414 melts, and this process enables the metal phase-change filler 414 to store heat, and after the electric heating element 413 is heated, the metal phase-change filler 414 gradually solidifies, and this process is an exothermic process, so that the phase-change heat element 40 can exchange heat with the heat exchange medium. Common metal phase change heat storage materials include aluminum-based, germanium-based, magnesium-based, zinc-based and nickel-based alloys. Among them, aluminum-silicon alloy materials have the characteristics of high thermal conductivity, high latent heat of phase change, and relatively low corrosiveness, and have become the most widely studied and applied metal phase change heat storage materials. In this embodiment, the metal phase change filler 414 is made of one or more of aluminum single metal, germanium single metal, magnesium single metal, zinc single metal or nickel single metal; or, the metal phase change filler 414 is made of one or more of aluminum-based alloy, germanium-based alloy, magnesium-based alloy, zinc-based alloy or nickel-based alloy.

[0042] like Figure 4As shown, the heat storage and exchange device also includes a first conductive member 63 and a second conductive member 64. In the direction from the inlet 12 to the flow gap 113, the first conductive member 63 and the second conductive member 64 are located on both sides of the phase change heat element 40. The first conductive member 63 is conductively connected to the first terminal 61, and the second conductive member 64 is conductively connected to the second terminal 62. One end of the electric heating element 413 of each phase change heat element 40 is conductively connected to the first conductive member 63, and the other end is conductively connected to the second conductive member 64. Specifically, the structures of the first conductive element 63 and the second conductive element 64 are similar. The first conductive element 63 is an annular frame structure, and the heat exchange medium can pass through the first conductive element 63 smoothly. One end of the electric heating element 413 of each phase change heat element 40 is conductively connected to the first conductive element 63, and the other end is conductively connected to the second conductive element 64, so that each electric heating element 413 is connected in parallel between the first conductive element 63 and the second conductive element 64, and then the first conductive element 63 is conductively connected to the first terminal 61, and the second conductive element 64 is conductively connected to the second terminal 62, thereby forming a circuit loop. Such an arrangement makes the circuit layout of the electric heating element 413 more reasonable.

[0043] like Figure 4 As shown, the first terminal 61 and the second terminal 62 are both located on the side of the phase change heat exchanger 40 away from the current gap 113, and a conductive connector 65 is provided in the partition 20, and the conductive connector 65 is conductively connected between the second terminal 62 and the second conductive member 64. Specifically, the first terminal 61 and the second terminal 62 are located on the same side of the phase change heat exchanger 40, so that the first terminal 61 and the second terminal 62 are easier to be electrically connected to the external power supply, and the provision of the conductive connector 65 can realize the conductive connection between the second terminal 62 and the second conductive member 64.

[0044] In addition, in this embodiment, the heat storage and exchange device includes heat exchange fins arranged in the flow passage 43, and at least one phase change heat exchange element 40 is thermally connected to the heat exchange fins. Specifically, the arrangement of the heat exchange fins can increase the contact area of ​​the heat exchange medium, thereby improving the heat exchange efficiency of the heat exchange medium.

[0045] like Figure 5 As shown, the present application also provides a second embodiment of the heat storage and exchange device, which is different from the first embodiment in that the phase change heat exchange element 40 is a cylindrical structure or a square column structure or a flat column structure, and a plurality of phase change heat exchange elements 40 are arranged at intervals along the extension direction parallel to the first chamber 111 or at intervals perpendicular to the extension direction of the first chamber 111. Specifically, in this embodiment, a plurality of phase change heat exchange elements 40 are arranged at intervals along the extension direction perpendicular to the first chamber 111, and the phase change heat exchange element 40 that meets the above requirements has the advantages of easy processing and loading and unloading.

[0046] In addition, in the present embodiment, an electric heating wire is disposed inside the phase-change heating element 40, the power input end of the electric heating wire is disposed at the first end of the phase-change heating element 40, and the power output end of the electric heating wire is disposed at the second end of the phase-change heating element 40, thereby achieving heating of the phase-change heating element 40. In other embodiments, the power input end and the power output end of the electric heating wire are both disposed at the first end of the phase-change heating element, the electric heating wire has a bending portion, the bending portion is disposed at the second end of the phase-change heating element, and the provision of the bending portion can increase the length of the electric heating wire, thereby increasing its heating power.

[0047] like Figure 6 As shown, the present application also provides a heat storage control method, and the heat storage control method of the present application is used to control a heat storage and exchange device, wherein the heat storage and exchange device is the above-mentioned heat storage and exchange device. The above-mentioned heat storage and exchange device can effectively solve the problem of insufficient heat exchange of the heat exchange medium in the related art, and the heat storage control method for controlling the above-mentioned heat storage and exchange device also has the above-mentioned advantages.

[0048] Specifically, the heat storage control method includes: S10: monitoring the grid load, when the grid load is less than or equal to a first preset value, the electric heating element 413 is started, and when the grid load is greater than or equal to the first preset value, the electric heating element 413 stops working; S20: monitoring the heating time of the electric heating element 413, when the heating time is greater than or equal to a second preset value, starting the heat exchanger 30, so that the heat exchange medium and the phase change heat element 40 exchange heat.

[0049] Monitor the grid load. When the grid load is less than or equal to the first preset value (that is, when the grid load is small), it means that the number of users who use electricity is small and the electric energy is relatively abundant. This part of the electric energy is used to make the electric heating element 413 work, thereby avoiding the waste of electric energy. When the grid load is greater than or equal to the first preset value (that is, when the grid load is large), the electric heating element 413 stops working, and the electric energy is supplied to the user. Monitor the heating time of the electric heating element 413. When the heating time is greater than or equal to the second preset value, it means that the metal phase change filler 414 in the phase change heat element 40 is fully heated and melted, and then start the heat exchanger 30 to allow the heat exchange medium to exchange heat with the phase change heat element 40.

[0050] Furthermore, according to the demand of the source, grid, load and storage for the heat storage and exchange device in the power grid, the heat storage capacity and electric heating capacity of the heat storage and exchange device are designed so that the heat storage and exchange device can meet the demand of peak frequency regulation or heat use on the power supply side, grid side, load side or energy storage station in the power grid;

[0051] According to the type of heat demand, design a heat storage and exchange device with matching capacity to generate hot water or steam to meet the needs of heat users;

[0052] According to the temperature range of hot water or steam, design and select the type of metal phase change filler for the heat storage and exchange device;

[0053] According to the temperature range of hot water or steam, the phase change heat exchange element is designed to be arranged horizontally or vertically in the accommodating chamber, and the accommodating chamber is separated into a first chamber and a second chamber by a partition, and the phase change heat exchange element is fixed by the partition;

[0054] The power consumption of the device can be increased or decreased by switching on and off the phase-change heat exchangers in series or parallel in batches, thereby responding to the peak-shaving and frequency-regulating signals of the power grid or thermal power units and realizing the thermal energy storage using the surplus power of the peak-shaving and frequency-regulating signals.

[0055] Furthermore, the overall power consumption of the heat storage and exchange device is adjusted according to the peak and frequency regulation load requirements of the power grid or thermal power unit on the heat storage and exchange device;

[0056] When the heat storage and exchange device is operating in the heat storage mode, the heat storage and exchange device starts to supply electric heating power to the phase change heat exchange element, and uses the power supply power of the increased group of phase change heat exchange elements to achieve an increase in overall power consumption, thereby responding to the needs of the power grid or thermal power units for deep peak regulation;

[0057] When the heat storage and exchange device is operating in a heat release condition, the heat storage and exchange device stops supplying electric heating power to the phase change heat exchange element, and utilizes the heat storage of the phase change heat exchange element and the hot air circulation in the containing cavity to heat the feed water to generate hot water or steam for heating demand, thereby responding to the demand of the power grid or thermal power unit to reduce the power consumption of the heat storage and exchange device;

[0058] When the power grid or thermal power unit hopes to use the heat storage and exchange device to respond to the power grid frequency regulation auxiliary service needs, it can use the rapid input or cut-off of power supply of several phase change heat exchange components to achieve a rapid increase or decrease in the power consumption of the heat storage and exchange device to respond to the power grid frequency regulation auxiliary service needs.

[0059] Compared with the prior art, the beneficial effects of the present invention include:

[0060] 1. The heat storage and exchange device provided by the present invention utilizes a specially designed electrically heated metal phase-change heat storage tube to achieve efficient storage of electrical energy into thermal energy, has high heat storage efficiency, occupies a small area, and is safer than conventional molten salt heat storage;

[0061] 2. The heat storage and exchange device provided by the present invention changes the electric heating work by switching on and off the number of metal phase change heat storage tubes, thereby responding to the peak and frequency modulation signals of the power grid, so that the heat storage and exchange device can participate in the regulation of power auxiliary services and obtain auxiliary service benefits.

[0062] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat storage and exchange device, characterized in that: include: A heat-insulating outer shell (10) having a containing cavity (11), wherein the heat-insulating outer shell (10) comprises an inlet (12) and an outlet (13) communicating with the containing cavity (11); a partition (20) disposed in the accommodating cavity (11), the partition (20) being connected to the inner surface of the heat-insulating outer shell (10) and dividing the accommodating cavity (11) into a first chamber (111) and a second chamber (112); one side of the partition (20) being spaced from the inner surface of the heat-insulating outer shell (10) and forming a flow gap (113) to connect the first chamber (111) and the second chamber (112); A heat exchanger (30) is arranged on the heat-insulating shell (10), and the heat exchanger (30) comprises a medium output channel and a medium input channel, the medium output channel is connected with the first chamber (111) through the inlet (12) and allows the heat exchange medium to enter the first chamber (111), and the medium input channel is connected with the second chamber (112) through the outlet (13) and allows the heat exchange medium to enter the medium input channel; A phase-change heat exchange element (40) is arranged in the accommodating cavity (11) so that the heat exchange medium can exchange heat with the phase-change heat exchange element (40). There are multiple phase-change heat exchange elements (40). Some of the phase-change heat exchange elements (40) are arranged in the first chamber (111) and are located between the inlet (12) and the flow gap (113). Some of the phase-change heat exchange elements (40) are arranged in the second chamber (112) and are located between the outlet (13) and the flow gap (113). The heat exchange medium flows through the inlet (12), the phase-change heat exchange element (40) located in the first chamber (111), the flow gap (113), the phase-change heat exchange element (40) located in the second chamber (112), and the outlet (13) in sequence.

2. The heat storage and exchange device according to claim 1, characterized in that: The phase change heat exchange element (40) is a cylindrical structure, a square column structure, or a flat column structure, and a plurality of phase change heat exchange elements (40) are arranged at intervals along an extension direction parallel to the first chamber (111) or at intervals perpendicular to the extension direction of the first chamber (111).

3. The heat storage and exchange device according to claim 2, characterized in that: The phase change heating element (40) is provided with an electric heating wire inside, wherein: The power input end and the output end of the electric heating wire are both arranged at the first end of the phase change heating element (40), and the electric heating wire has a bending portion, and the bending portion is located at the second end of the phase change heating element (40); or, The power input end of the electric heating wire is arranged at the first end of the phase-change heat element (40), and the power output end of the electric heating wire is arranged at the second end of the phase-change heat element (40).

4. The heat storage and exchange device according to claim 1, characterized in that: In the first chamber (111), the phase change heat exchange element (40) is a plate-like structure, a plurality of the phase change heat exchange elements (40) are arranged at intervals, and a flow passage (43) is formed between two adjacent phase change heat exchange elements (40), and two ends of the flow passage (43) are respectively connected to the inlet (12) and the flow gap (113).

5. The heat storage and exchange device according to claim 4, characterized in that: The heat-insulating outer shell (10) is provided with a first terminal (61) and a second terminal (62); the phase-change heating element (40) comprises an outer shell (411), an inner shell (412) and an insulating support; the inner shell (412) is located inside the outer shell (411); an electric heating element (413) is provided inside the inner shell (412); there are a plurality of insulating support members, which are arranged at intervals inside the inner shell (412) and support and cooperate with the electric heating element (413); two ends of the electric heating element (413) are respectively electrically connected to the first terminal (61) and the second terminal (62); and a metal phase-change filler (414) is provided between the inner surface of the outer shell (411) and the outer surface of the inner shell (412).

6. The heat storage and exchange device according to claim 5, characterized in that: The heat storage and exchange device further comprises a first conductive member (63) and a second conductive member (64); in the direction from the inlet (12) to the flow gap (113), the first conductive member (63) and the second conductive member (64) are located on both sides of the phase change heat exchange element (40); the first conductive member (63) is conductively connected to the first terminal (61); the second conductive member (64) is conductively connected to the second terminal (62); one end of the electric heating element (413) of each phase change heat exchange element (40) is conductively connected to the first conductive member (63); and the other end is conductively connected to the second conductive member (64).

7. The heat storage and exchange device according to claim 6, characterized in that: The first terminal (61) and the second terminal (62) are both located on a side of the phase change heat exchange element (40) away from the current flow gap (113), and a conductive connecting element (65) is provided in the partition (20), and the conductive connecting element (65) is conductively connected between the second terminal (62) and the second conductive element (64).

8. The heat storage and exchange device according to any one of claims 5 to 7, characterized in that: The metal phase change filler (414) is made of one or more of aluminum, germanium, magnesium, zinc or nickel; or, The metal phase-change filler (414) is made of one or more of an aluminum-based alloy, a germanium-based alloy, a magnesium-based alloy, a zinc-based alloy or a nickel-based alloy.

9. The heat storage and exchange device according to any one of claims 5 to 7, characterized in that: The heat storage and exchange device comprises a heat exchange fin arranged in the flow passage (43), and at least one of the phase change heat exchange elements (40) is thermally connected to the heat exchange fin.

10. A heat storage control method, characterized in that: Used to control the heat storage and exchange device according to any one of claims 5 to 9, the heat storage control method comprises: Monitoring the load of the power grid, when the load of the power grid is less than or equal to a first preset value, the electric heating element (413) starts working, and when the load of the power grid is greater than or equal to the first preset value, the electric heating element (413) stops working; The heating time of the electric heating element (413) is monitored, and when the heating time is greater than or equal to a second preset value, the heat exchanger (30) is started to allow the heat exchange medium to exchange heat with the phase change heat storage component (40).

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