Heat storage and heat exchange device and heat storage control method

Abstract

The application 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 chamber and a second chamber, one side of the partition plate is arranged at a distance from an inner surface of a heat preservation shell and forms a flow gap to communicate the first chamber and the second chamber; the heat exchanger comprises a medium output channel and a medium input channel, the medium output channel communicates with the first chamber through an inlet, and the medium input channel communicates with the second chamber through an outlet; part of phase change heat exchange pieces are arranged in the first chamber and located between the inlet and the flow gap, and part of phase change heat exchange pieces 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 exchange pieces in the first chamber, the flow gap, the phase change heat exchange pieces in the second chamber and the outlet in sequence. The technical scheme of the application can effectively solve the problem of insufficient heat exchange of the heat exchange medium in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat storage and heat exchange, in particular to a heat storage and heat exchange device and a heat storage control method. BACKGROUND

[0002] Heat storage technology generally includes sensible heat storage, latent heat storage (both of which are thermophysical heat storage) and thermochemical heat storage. Among them, sensible heat storage stores heat by temperature rise of high specific heat capacity materials, and the energy storage density is 30-80 kWh / m 3 , which has simple storage mode and low energy storage cost, but the system volume is too large and the heat loss is serious. Latent heat storage stores heat by phase change of materials, and the energy storage density is 83-140 kWh / m 3 .

[0003] At present, common heat storage technologies include solid heat storage (sensible heat), water heat storage (sensible heat), phase change heat storage (latent heat + sensible heat), etc., among which the water heat storage has the lowest cost, the solid heat storage has medium cost, and the phase change heat storage has relatively high cost. The metal phase change material for medium and high temperature has the characteristics of high heat storage density and high thermal conductivity, and its main advantages are as follows: 1. The thermal conductivity is tens of times that of traditional phase change materials, which is beneficial to the rapid response of system charging and discharging heat; 2. The metal has large density, high latent heat per unit volume, and high phase change temperature, so the high sensible heat and high latent heat make the energy storage density high, which is beneficial to the design of compact heat storage device. Due to the above characteristics, the heat storage device based on metal phase change material can solve the problems of low heat storage density and low charging and discharging power of traditional heat storage device.

[0004] During the heat releasing process of the heat storage device, the heat exchange between the heat exchange medium and the metal phase change material is often not sufficient, which leads to low heating efficiency of the heat exchange medium on the heated material. SUMMARY

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

[0006] In order to achieve the above object, according to one aspect of the present application, a heat storage and exchange device is provided, comprising: a heat preservation shell having a containing cavity, the heat preservation shell comprising an inlet and an outlet communicating with the containing cavity; a partition plate arranged in the containing cavity, the partition plate being connected with an inner surface of the heat preservation shell and separating the containing cavity into a first chamber and a second chamber, one side of the partition plate being arranged in a spaced manner with the inner surface of the heat preservation shell and forming a flow gap to communicate the first chamber and the second chamber; a heat exchanger arranged on the heat preservation shell, the heat exchanger comprising a medium output channel and a medium input channel, the medium output channel communicating with the first chamber through the inlet and enabling a heat exchange medium to enter into the first chamber, the medium input channel communicating with the second chamber through the outlet and enabling the heat exchange medium to enter into the medium input channel; phase change heat exchange pieces arranged in the containing cavity to enable the heat exchange medium to exchange heat with the phase change heat exchange pieces, the phase change heat exchange pieces being a plurality of pieces, part of the phase change heat exchange pieces being arranged in the first chamber and located between the inlet and the flow gap, part of the phase change heat exchange pieces being arranged in the second chamber and located between the outlet and the flow gap, the heat exchange medium sequentially flowing through the inlet, the phase change heat exchange pieces located in the first chamber, the flow gap, the phase change heat exchange pieces located in the second chamber and the outlet.

[0007] Further, the phase change heat exchange pieces are in a cylindrical structure or a square column structure or a flat column structure, and the plurality of phase change heat exchange pieces are arranged in a spaced manner along a direction parallel to an extension direction of the first chamber or in a spaced manner perpendicular to the extension direction of the first chamber.

[0008] Further, an electric heating wire is arranged in the phase change heat exchange piece, wherein the inlet end and the outlet end of the electric heating wire are arranged at the first end of the phase change heat exchange piece, the electric heating wire has a bending part, and the bending part is located at the second end of the phase change heat exchange piece; or the inlet end of the electric heating wire is arranged at the first end of the phase change heat exchange piece, and the outlet end of the electric heating wire is arranged at the second end of the phase change heat exchange piece.

[0009] Further, in the first chamber, the phase change heat exchange pieces are in a plate structure, the plurality of phase change heat exchange pieces are arranged in a spaced manner, a flow channel is formed between two adjacent phase change heat exchange pieces, and two ends of the flow channel respectively communicate with the inlet and the flow gap.

[0010] Further, the heat preservation shell is provided with a first terminal and a second terminal, the phase change heat exchange piece comprises an outer shell, an inner shell and a plurality of insulating support pieces, the inner shell is located in the inner part of the outer shell, an electric heating element is arranged in the inner part of the inner shell, the plurality of insulating support pieces are arranged in the inner part of the inner shell in a spaced manner and are in supporting cooperation with the electric heating element, two ends of the electric heating element are respectively in electrically conductive connection with the first terminal and the second terminal, and a metal phase change filler is arranged between the inner surface of the outer shell and the outer surface of the inner shell.

[0011] Further, the heat storage and exchange device further comprises a first conductive member and a second conductive member, the first conductive member and the second conductive member are located on two sides of the phase-change heat exchange member in the direction of the inlet of the flow gap, the first conductive member is in conductive connection with the first terminal, the second conductive member is in conductive connection with the second terminal, one end of the electric heating element of each phase-change heat exchange member is in conductive connection with the first conductive member, and the other end is in conductive connection with the second conductive member.

[0012] Further, the first terminal and the second terminal are both located on the side of the phase-change heat exchange member away from the flow gap, the baffle is provided with a conductive connecting member, and the conductive connecting member is in conductive connection between the second terminal and the second conductive member.

[0013] Further, the metal phase-change filler is made of one or more of aluminum, germanium, magnesium, zinc or nickel; 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] Further, the heat storage and exchange device comprises heat exchange fins arranged in the flow channel, and at least one phase-change heat exchange member is in conductive connection with the heat exchange fins.

[0015] According to another aspect of the present application, a heat storage control method is provided for controlling the heat storage and exchange device, and the heat storage control method comprises: monitoring the power grid load, starting the electric heating element when the power grid load is less than or equal to a first preset value, and stopping the electric heating element when the power grid load is greater than or equal to the first preset value; monitoring the heating time of the electric heating element, and starting the heat exchanger to make the heat exchange medium exchange heat with the phase-change heat storage assembly when the heating time is greater than or equal to a second preset value.

[0016] Applying the technical solution of this invention, the heat-insulating shell has a receiving cavity, including an inlet and an outlet communicating with the receiving cavity. A partition is disposed within the receiving cavity, dividing the receiving cavity into a first chamber and a second chamber. The partition is spaced apart from the inner surface of the heat-insulating shell, forming a flow gap that connects the first and second chambers. The heat exchanger enables the heat exchange medium to heat the substance to be heated. The heat exchanger includes a medium output channel and a medium input channel. The medium output channel communicates with the first chamber through the inlet, and the medium input channel communicates with the second chamber through the outlet, thus forming a flow path where 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. Multiple phase change heat exchange elements are disposed within the receiving cavity to enable the heat exchange medium to undergo phase change heat exchange. In this heat exchanger, a portion of the phase change heat exchanger is disposed within the first chamber, located between the inlet and the flow gap, while another portion is disposed within the second chamber, located between the outlet and the flow gap. When the phase change heat exchanger heats the heat exchange medium, the lower-energy heat exchange medium flows sequentially through the inlet, the phase change heat exchanger in the first chamber, the flow gap, the phase change heat exchanger in the second chamber, and the outlet, thus being heated multiple times by the phase change heat exchanger to become a higher-energy heat exchange medium. This higher-energy heat exchange medium then heats the substance to be heated through the heat exchanger, and then becomes a lower-energy heat exchange medium again. This arrangement allows the heat exchange medium to flow along a longer path within the chamber, exchanging heat with the phase change heat exchanger multiple times, thereby ensuring sufficient heat exchange and improving heat exchange efficiency. Therefore, the technical solution of this application effectively solves the problem of insufficient heat exchange in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, 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:

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

[0019] Figure 2 It shows Figure 1 A top view of the first phase change heat exchange element and flow channel plate of the heat storage heat exchange device;

[0020] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of the first phase change heat exchange element of the heat storage and exchange device;

[0021] Figure 4 It shows Figure 1 A schematic diagram of the principle of the first terminal, second terminal, first conductive component, second conductive component, and conductive connector of the heat storage and exchange device;

[0022] Figure 5 shows a cross-sectional view of a second embodiment of the heat storage and exchange device according to the present application;

[0023] Figure 6 shows a flow chart of an embodiment of the heat storage control method according to the present application.

[0024] Wherein, the above figures include the following reference signs:

[0025] 10, heat insulation shell; 11, containing cavity; 111, first chamber; 112, second chamber; 113, flow gap; 12, inlet; 13, outlet;

[0026] 20, partition plate;

[0027] 30, heat exchanger;

[0028] 40, phase change heat exchange member; 411, outer shell; 412, inner shell; 413, electric heating member; 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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

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

[0033] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only and not to limit the scope of the application. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail but are intended to be part of the specification when appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Thus, other examples of exemplary embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the several views, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures.

[0034] As Figure 1 shown, the application provides a heat storage and exchange device, the first embodiment of the heat storage and exchange device of the application comprises: a heat preservation shell 10, a partition plate 20, a heat exchanger 30, and a phase change heat exchange member 40; the heat preservation shell 10 has a containing cavity 11, and the heat preservation shell 10 comprises an inlet 12 and an outlet 13 which communicate with the containing cavity 11; the partition plate 20 is arranged in the containing cavity 11, the partition plate 20 is connected with the inner surface of the heat preservation shell 10 and separates the containing cavity 11 into a first chamber 111 and a second chamber 112, one side of the partition plate 20 is arranged in a spaced manner with the inner surface of the heat preservation shell 10 and forms an overflow gap 113 to communicate the first chamber 111 and the second chamber 112; the heat exchanger 30 is arranged on the heat preservation shell 10, the heat exchanger 30 comprises a medium output channel and a medium input channel, the medium output channel communicates with the first chamber 111 through the inlet 12 and enables the heat exchange medium to enter into the first chamber 111, and the medium input channel communicates with the second chamber 112 through the outlet 13 and enables the heat exchange medium to enter into the medium input channel; the phase change heat exchange member 40 is arranged in the containing cavity 11 to enable the heat exchange medium to exchange heat with the phase change heat exchange member 40, the phase change heat exchange member 40 is multiple, part of the phase change heat exchange member 40 is arranged in the first chamber 111 and located between the inlet 12 and the overflow gap 113, and part of the phase change heat exchange member 40 is arranged in the second chamber 112 and located between the outlet 13 and the overflow gap 113, the heat exchange medium flows through the inlet 12, the phase change heat exchange member 40 located in the first chamber 111, the overflow gap 113, the phase change heat exchange member 40 located in the second chamber 112, and the outlet 13 in sequence.

[0035] The application discloses a heat preservation shell, which comprises a containing cavity, an inlet and an outlet, a partition plate, a heat exchanger and a plurality of phase change heat exchange elements.

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

[0037] As Figure 1 and Figure 2As shown in the drawings, in the first chamber 111, the phase change heat transfer piece 40 is in a plate structure, a plurality of phase change heat transfer pieces 40 are arranged at intervals, a flow passage 43 is formed between two adjacent phase change heat transfer pieces 40, and the two ends of the flow passage 43 are respectively communicated with the inlet 12 and the flow gap 113. Specifically, the phase change heat transfer piece 40 in the plate structure can have a larger contact surface with the heat exchange medium, thereby ensuring sufficient heat exchange of the heat exchange medium, and a plurality of phase change heat transfer pieces 40 can also ensure the heat exchange efficiency of the heat exchange medium. The arrangement of the flow passage 43 enables the heat exchange medium to flow through the flow passage 43, and thus the heat exchange medium can be in heat exchange with the phase change heat transfer piece 40. The present embodiment mainly describes the phase change heat transfer piece 40 in the first chamber 111, and the phase change heat transfer piece 40 in the second chamber 112 also has similar structure and function,

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

[0039] As shown in the drawings, Figure 1 and Figure 2 The flow passage 43 comprises oppositely arranged first and second side walls, and the flow gaps 113 between the two adjacent flow channel plates 50 and the flow passage 43 are formed by the first and second inner walls, respectively. In the present embodiment, the oppositely arranged first and second side walls of the flow passage 43 are respectively Figure 1 two opposite inner surfaces (respectively, the first and second inner surfaces, which are located on the upper and lower sides in the Figure 2 first and second inner surfaces), one end of one flow channel plate 50 of the two adjacent flow channel plates 50 is connected with the first inner surface, and the other end is arranged at intervals with the second inner surface, one end of the other flow channel plate 50 of the two adjacent flow channel plates 50 is connected with the second inner surface, and the other end is arranged at intervals with the first inner surface, that is, the two adjacent flow gaps 113 are formed between the flow channel plate 50 and the first inner surface and between the flow channel plate 50 and the second inner surface, respectively, and thus the flow path of the heat exchange medium forms an S shape, thereby making the flow path of the heat exchange medium longer.

[0040] As shown in the drawings, Figure 1 andFigure 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 arranged in a spaced manner with the first inner wall, the second flow channel plate 53 is arranged in a spaced manner with the second inner wall, and the first flow channel plate 52 and the second flow channel plate 53 are arranged alternately. In this way, the S-shaped flow path is further lengthened, so that the heat exchange medium and the phase change heat exchange member 40 can be fully heat exchanged.

[0041] As shown in the drawings, Figure 3 As shown, the heat preservation shell 10 is provided with a first terminal 61 and a second terminal 62, the phase change heat exchange member 40 includes an outer shell 411, an inner shell 412, and a plurality of insulating supports, the inner shell 412 is located inside the outer shell 411, the inner shell 412 is provided with an electric heating element 413 inside, the plurality of insulating supports are arranged in a spaced manner inside the inner shell 412 and are in supporting cooperation with the electric heating element 413, the two ends of the electric heating element 413 are respectively electrically connected with the first terminal 61 and the second terminal 62, and a metal phase change filler 414 is arranged 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 a heat release process, so that the phase change heat exchange member 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 material has the characteristics of high thermal conductivity, high phase change latent heat, and relatively low corrosion, and has become the most widely researched and applied metal phase change heat storage material. 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] As shown in the drawings, Figure 4As shown, the heat storage and exchange device further comprises a first electrically conductive member 63 and a second electrically conductive member 64, which are located on both sides of the phase-change heat exchange member 40 in the direction from the inlet 12 to the flow gap 113, the first electrically conductive member 63 is in electrically conductive connection with the first terminal 61, the second electrically conductive member 64 is in electrically conductive connection with the second terminal 62, one end of the electric heating element 413 of each phase-change heat exchange member 40 is in electrically conductive connection with the first electrically conductive member 63, and the other end is in electrically conductive connection with the second electrically conductive member 64. Specifically, the first electrically conductive member 63 and the second electrically conductive member 64 are similar in structure, the first electrically conductive member 63 is in the form of a ring-shaped frame structure, the heat exchange medium can pass through the first electrically conductive member 63 smoothly, one end of the electric heating element 413 of each phase-change heat exchange member 40 is in electrically conductive connection with the first electrically conductive member 63, and the other end is in electrically conductive connection with the second electrically conductive member 64, so that each electric heating element 413 is connected in parallel between the first electrically conductive member 63 and the second electrically conductive member 64, and then the first electrically conductive member 63 is in electrically conductive connection with the first terminal 61, and the second electrically conductive member 64 is in electrically conductive connection with the second terminal 62, thereby forming a circuit loop. In this way, the circuit arrangement of the electric heating element 413 is more reasonable.

[0043] As shown in Figure 4 the first terminal 61 and the second terminal 62 are located on the side of the phase-change heat exchange member 40 away from the flow gap 113, and an electrically conductive connecting member 65 is arranged in the partition plate 20 and is in electrically conductive connection between the second terminal 62 and the second electrically conductive member 64. Specifically, the first terminal 61 and the second terminal 62 are located on the same side of the phase-change heat exchange member 40, so that the first terminal 61 and the second terminal 62 are more easily electrically connected to an external power supply, and the electrically conductive connecting member 65 can achieve electrically conductive connection between the second terminal 62 and the second electrically conductive member 64.

[0044] In addition, in the present embodiment, the heat storage and exchange device comprises heat exchange fins arranged in the flow passage 43, and at least one phase-change heat exchange member 40 is in thermal conductive connection with 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] As shown in Figure 5 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 member 40 is in the form of a cylindrical structure or a square columnar structure or a flat columnar structure, and a plurality of phase-change heat exchange members 40 are arranged in a spaced manner along the extension direction parallel to the first chamber 111 or in a spaced manner perpendicular to the extension direction of the first chamber 111. Specifically, in the present embodiment, the plurality of phase-change heat exchange members 40 are arranged in a spaced manner perpendicular to the extension direction of the first chamber 111, and the phase-change heat exchange member 40 satisfying the above requirements has the advantages of being easy to process and disassemble.

[0046] Further, in the embodiment, the phase-change heat exchange element 40 is internally provided with an electric heating wire, the power input end of the electric heating wire is arranged at the first end of the phase-change heat exchange element 40, and the power output end of the electric heating wire is arranged at the second end of the phase-change heat exchange element 40, so as to realize heating of the phase-change heat exchange element 40. In other embodiments, 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 exchange element, and the electric heating wire has a bending portion, which is located at the second end of the phase-change heat exchange element. The arrangement of the bending portion can increase the length of the electric heating wire, thereby increasing the heating power thereof.

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

[0048] Specifically, the heat storage control method comprises the following steps: S10: monitoring the power grid load. When the power grid load is less than or equal to a first preset value, the electric heating element 413 is started. When the power 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, the heat exchanger 30 is started, and the heat exchange medium is subjected to heat exchange with the phase-change heat exchange element 40.

[0049] Monitoring the power grid load means that when the power grid load is less than or equal to the first preset value (that is, when the power grid load is small), the number of users using electricity at this time is small, and the electric energy is relatively abundant. The electric energy is used to make the electric heating element 413 work, thereby avoiding waste of electric energy. When the power grid load is greater than or equal to the first preset value (that is, when the power grid load is large), the electric heating element 413 stops working, and the electric energy at this time is supplied to users. Monitoring the heating time of the electric heating element 413 means that when the heating time is greater than or equal to the second preset value, the metal phase-change filler 414 in the phase-change heat exchange element 40 is fully heated and melted. Then, the heat exchanger 30 is started, and the heat exchange medium is subjected to heat exchange with the phase-change heat exchange element 40.

[0050] Further, according to the demand of the source grid load storage in the power grid for the heat storage device, the heat storage capacity and the electric heating capacity of the heat storage device are designed, so that the heat storage device meets the demand of the power source side, the power grid side, the load side or the peak shaving and frequency modulation or heat utilization in the energy storage station.

[0051] According to the type of heat utilization demand, the heat storage device with a matched capacity is designed, so that hot water or steam is generated to meet the demand of heat users.

[0052] According to the temperature range of the hot water or steam, the type of the metal phase-change filler of the heat storage device is designed and selected.

[0053] According to the temperature range of generating hot water or steam, the horizontal or vertical arrangement mode of the phase change heat transfer piece in the containing cavity is selected, the containing cavity is divided into a first chamber and a second chamber by a partition plate, and the phase change heat transfer piece is fixed by the partition plate;

[0054] The increase or decrease of the power consumption of the device is realized by the batch switching of the phase change heat transfer pieces in series or parallel, so as to respond to the peak regulation and frequency modulation signal of the power grid or the thermal power unit, and the heat storage energy is realized by using the surplus power of the peak regulation and frequency modulation.

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

[0056] When the heat storage and exchange device is in the heat storage operating condition, the heat storage and exchange device starts to supply power to the phase change heat transfer piece for electric heating, and the overall power consumption is increased by increasing the power supply of the phase change heat transfer piece in groups, so as to respond to the demand of the power grid or the thermal power unit for deep peak regulation;

[0057] When the heat storage and exchange device is in the heat release operating condition, the heat storage and exchange device stops supplying power to the phase change heat transfer piece for electric heating, and the heat storage and exchange device is heated by the heat storage of the phase change heat transfer piece and the hot air circulation in the containing cavity to generate hot water or steam for heat supply demand, so as to respond to the demand of the power grid or the thermal power unit for reducing the power consumption of the heat storage and exchange device;

[0058] When the power grid or the thermal power unit wants to respond to the grid frequency modulation auxiliary service demand by using the heat storage and exchange device, the power supply of several phase change heat transfer pieces can be quickly put into or cut off, so as to realize the rapid increase or decrease of the power consumption of the heat storage and exchange device, and respond to the grid frequency modulation auxiliary service demand.

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

[0060] 1. The heat storage and exchange device provided by the present application realizes efficient storage of electric energy into heat energy by using specially designed electric heating metal phase change heat storage pipes, has high heat storage efficiency, small occupied area, and higher safety than conventional molten salt heat storage;

[0061] 2. The heat storage and exchange device provided by the present application changes the electric heating power by switching the number of metal phase change heat storage pipes, so as to respond to the peak regulation and frequency modulation signal of the power grid, so that the heat storage and exchange device can participate in the auxiliary service regulation of the power grid and obtain auxiliary service income.

[0062] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0063] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0064] In addition, it should be noted that the use of "first", "second" and the like to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0065] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A heat accumulator-exchanger device, characterized by, The application relates to a heat preservation shell (10) with a containing cavity (11), the heat preservation shell (10) comprising an inlet (12) and an outlet (13) communicating with the containing cavity (11); a partition plate (20) arranged in the containing cavity (11), the partition plate (20) being connected with the inner surface of the heat preservation shell (10) and separating the containing cavity (11) into a first cavity (111) and a second cavity (112), one side of the partition plate (20) being arranged in a spaced mode with the inner surface of the heat preservation shell (10) and forming a flow gap (113) to communicate the first cavity (111) and the second cavity (112); a heat exchanger (30) arranged on the heat preservation shell (10), the heat exchanger (30) comprising a medium output channel and a medium input channel, the medium output channel communicating with the first cavity (111) through the inlet (12) and enabling a heat exchange medium to enter into the first cavity (111), the medium input channel communicating with the second cavity (112) through the outlet (13) and enabling the heat exchange medium to enter into the medium input channel; phase change heat exchange pieces (40) arranged in the containing cavity (11) to enable the heat exchange medium to exchange heat with the phase change heat exchange pieces (40), the phase change heat exchange pieces (40) being multiple, part of the phase change heat exchange pieces (40) being arranged in the first cavity (111) and located between the inlet (12) and the flow gap (113), part of the phase change heat exchange pieces (40) being arranged in the second cavity (112) and located between the outlet (13) and the flow gap (113), the heat exchange medium sequentially flowing through the inlet (12), the phase change heat exchange pieces (40) located in the first cavity (111), the flow gap (113), the phase change heat exchange pieces (40) located in the second cavity (112) and the outlet (13); the heat preservation shell (10) being provided with a first terminal (61) and a second terminal (62), the phase change heat exchange pieces (40) comprising an outer shell (411), an inner shell (412) and insulating supports, the inner shell (412) being located in the inner part of the outer shell (411), the inner part of the inner shell (412) being provided with an electric heating piece (413), the insulating supports being multiple, the multiple insulating supports being arranged in a spaced mode in the inner part of the inner shell (412) and being in supporting cooperation with the electric heating piece (413), two ends of the electric heating piece (413) being electrically connected with the first terminal (61) and the second terminal (62) respectively, and metal phase change fillers (414) being arranged between the inner surface of the outer shell (411) and the outer surface of the inner shell (412). ​ ​ ​ ​ ​ The heat storage and exchange device further comprises a first conductive member (63) and a second conductive member (64), the first conductive member (63) and the second conductive member (64) are located on both sides of the phase-change heat exchange member (40) in the direction from the inlet (12) to the flow gap (113), the first conductive member (63) is in conductive connection with the first terminal (61), the second conductive member (64) is in conductive connection with the second terminal (62), one end of the electric heating element (413) of each phase-change heat exchange member (40) is in conductive connection with the first conductive member (63), and the other end is in conductive connection with the second conductive member (64).

2. The heat accumulator according to claim 1, characterized in that The phase-change heat exchange member (40) has a cylindrical structure, a square columnar structure or a flat columnar structure, and a plurality of phase-change heat exchange members (40) are arranged at intervals in parallel to the extension direction of the first chamber (111) or at intervals perpendicular to the extension direction of the first chamber (111).

3. The heat accumulator according to claim 2, characterized in that The phase-change heat exchange member (40) is internally provided with an electric heating wire, 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 exchange member (40), the electric heating wire has a bending part, and the bending part is located at the second end of the phase-change heat exchange member (40); or the power input end of the electric heating wire is arranged at the first end of the phase-change heat exchange member (40), and the power output end of the electric heating wire is arranged at the second end of the phase-change heat exchange member (40).

4. The heat accumulator according to claim 1, wherein In the first chamber (111), the phase-change heat exchange member (40) has a plate structure, a plurality of phase-change heat exchange members (40) are arranged at intervals, a flow passage (43) is formed between two adjacent phase-change heat exchange members (40), and the two ends of the flow passage (43) are respectively in communication with the inlet (12) and the flow gap (113).

5. The heat accumulator according to claim 4, characterized in that The first terminal (61) and the second terminal (62) are both located on the side of the phase-change heat exchange member (40) away from the flow gap (113), and the baffle (20) is internally provided with a conductive connecting member (65) in conductive connection between the second terminal (62) and the second conductive member (64).

6. The heat storage and exchange device according to claim 4 or 5, wherein 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 aluminum-based alloy, germanium-based alloy, magnesium-based alloy, zinc-based alloy or nickel-based alloy.

7. The heat accumulator according to claim 4 or 5, characterized in that The heat storage and exchange device comprises heat exchange fins arranged in the flow passage (43), and at least one phase-change heat exchange member (40) is in conductive connection with the heat exchange fins.

8. A heat storage control method characterized by, The heat storage control method for controlling the heat storage and exchange device of any one of claims 5, 6 or 7 comprises: monitoring the power grid load, starting the electric heating element (413) when the power grid load is less than or equal to a first preset value, and stopping the electric heating element (413) when the power grid load is greater than or equal to the first preset value; 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 make the heat exchange medium exchange heat with the phase change heat exchange element (40).

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