Heat storage device and heat storage system

Abstract

The invention relates to a heat storage device and a heat storage system. The heat storage device comprises a heat storage box body, a solid heat storage material and a heat exchange pipeline, and a heat storage cavity is formed in the heat storage box body; the solid heat storage material is arranged in the heat storage cavity and provided with fixing holes. The heat exchange pipeline comprises heat exchange branch pipes located in the heat storage cavity and inserted into the fixing holes, and the outer wall faces of the heat exchange branch pipes are connected to the inner wall faces of the fixing holes in a heat conduction mode. By means of the technical scheme, the heat storage device can effectively improve the energy utilization rate, high heat exchange efficiency is guaranteed, and meanwhile high reliability is achieved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat storage equipment, and in particular, to a heat storage device and a heat storage system. Background Art

[0002] As the demand for electricity continues to increase, the contradiction between supply and demand between power plants and users has become increasingly prominent. During peak power loads, the power generation cannot meet user demand, while during low-peak power loads, the power generation is greater than user demand, and the power generation equipment has to operate at a low load, resulting in reduced power plant efficiency and affecting the safe and economical operation of the power generation equipment. Therefore, increasing the power consumption of the power grid during off-peak hours and balancing the load of the power grid is of great significance to improving the environment and ensuring the efficient operation of the generator sets. Thermal storage technology converts electrical energy into thermal energy and stores it in a medium during low power consumption, and releases the stored heat during peak power consumption. This method can achieve peak shaving and valley filling for the power grid, which is conducive to reducing installed capacity. The power generation efficiency can also be maintained at a high level during low power consumption, ensuring the safe and efficient operation of the power grid.

[0003] In the related art, the existing heat storage system uses an electric heating wire to convert electrical energy into thermal energy to heat the thermal storage material for energy storage. However, since the conversion of electrical energy into thermal energy for storage will reduce the energy quality, resulting in a problem of reduced energy utilization. In addition, this electric heating method also limits the selection range of thermal storage materials to insulating materials, and the life and reliability of the electric heating wire will also affect the use of the entire system. Summary of the invention

[0004] The purpose of the present disclosure is to provide a heat storage device and a heat storage system, wherein the heat storage device can effectively improve energy utilization, ensure high heat exchange efficiency, and also have high reliability.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a heat storage device, comprising: a heat storage box having a heat storage chamber therein; a solid heat storage material, which is arranged in the heat storage chamber and has a fixing hole thereon; and a heat exchange pipe, the heat exchange pipe comprising a heat exchange branch pipe located in the heat storage chamber and inserted in the fixing hole, the outer wall surface of the heat exchange branch pipe being heat-conductively connected to the inner wall surface of the fixing hole.

[0006] Optionally, the solid heat storage material is constructed as a heat storage brick layer, and the heat storage brick layer is provided with a plurality of fixing holes extending along the first direction and penetrating the heat storage brick layer, and a plurality of the heat exchange branch pipes are plugged into corresponding fixing holes one by one.

[0007] Optionally, the plurality of fixing holes are arranged in multiple rows at equal intervals along a third direction perpendicular to the first direction, and the plurality of fixing holes in the same row have the same size in a second direction perpendicular to the first direction and the third direction, and two adjacent fixing holes are arranged parallel to each other.

[0008] Optionally, the heat storage brick layer includes multiple brick layers stacked along a third direction, each brick layer includes multiple heat storage brick bodies arranged in sequence along the first direction and / or the second direction; the fixing hole includes a channel penetrating the heat storage brick body along the first direction; and / or the fixing hole includes a groove extending along the first direction and formed on the surface of the heat storage brick body, and the groove and the surface of the adjacent heat storage brick body, or the groove and the groove of the adjacent heat storage brick body together form the fixing hole.

[0009] Optionally, two upper and lower adjacent brick layers are arranged alternately along the first direction and / or along the second direction.

[0010] Optionally, a heat preservation and insulation layer is further provided inside the heat storage box to reduce heat loss in the heat storage chamber, and a heat-resistant support structure for fixing the heat exchange pipe and the solid heat storage material is also provided inside the heat storage chamber.

[0011] Optionally, the heat exchange pipeline also includes an upper pipeline and a lower pipeline located in the heat storage chamber, one of the upper pipeline and the lower pipeline has a first inlet end, and the other has a first outlet end, and the first inlet end and the first outlet end are respectively located at two relatively outer sides of the heat storage box; the upper pipeline and the lower pipeline both include a heat exchange main pipe extending along the second direction, and the two heat exchange main pipes are respectively provided with a plurality of first heat exchange branch pipes and second heat exchange branch pipes spaced and arranged in parallel along the second direction, the first heat exchange branch pipe and the second heat exchange branch pipe both extend along the third direction and are arranged in parallel one by one, and the first heat exchange branch pipes and the second heat exchange branch pipes arranged in parallel along the first direction are both connected to the plurality of heat exchange branch pipes arranged side by side; wherein the second direction intersects with the third direction, and the first direction is perpendicular to the plane where the second direction and the third direction are located.

[0012] Optionally, the solid heat storage material is a sensible heat storage material or a latent heat storage material.

[0013] A second aspect of the present disclosure further provides a heat storage system, comprising the heat storage device as described above; the number of the heat exchange pipe is one, and the heat exchange pipe is used for the circulation of the first heat exchange medium or the second heat exchange medium, or the number of the heat exchange pipes is two and includes a first heat exchange pipe and a second heat exchange pipe, the first heat exchange pipe is used for the circulation of the first heat exchange medium, and the second heat exchange pipe is used for the circulation of the second heat exchange medium; wherein, in the heat storage state, the solid heat storage material stores the heat in the first heat exchange medium into the solid heat storage material after heat exchange with the first heat exchange medium, and in the heat release state, the solid heat storage material transfers the heat stored in the solid heat storage material to the second heat exchange medium after heat exchange with the second heat exchange medium.

[0014] Optionally, there is one heat exchange pipe and both ends are connected to a heat exchange medium supply pipe and a heat exchange medium discharge pipe respectively, a first bypass pipe is connected between the heat exchange medium supply pipe and the heat exchange medium discharge pipe, and a first control valve is arranged on the first bypass pipe.

[0015] Optionally, the number of the heat exchange pipes is two, and the two ends of the first heat exchange pipe are respectively connected to the first heat exchange medium supply pipe and the first heat exchange medium discharge pipe, and the two ends of the second heat exchange pipe are respectively connected to the second heat exchange medium supply pipe and the second heat exchange medium discharge pipe, a second bypass pipe is connected between the second heat exchange medium supply pipe and the second heat exchange medium discharge pipe, and a second control valve is arranged on the second bypass pipe.

[0016] Optionally, the heat storage system also includes a heat exchange unit, which has a second inlet end and a second outlet end respectively connected to the two ends of the heat exchange pipe, and is used to guide the heat exchange medium after heat exchange in the heat storage device into the heat exchange unit and perform heat exchange with an external heat-using device.

[0017] Through the above technical solution, that is, the heat storage device provided by the present disclosure, the solid heat storage material is arranged in the heat storage chamber of the heat storage box, and a fixing hole for inserting the heat exchange branch pipe of the heat exchange pipe is opened on the solid heat storage material, and the outer wall surface of the heat exchange branch pipe is heat-conductingly connected to the inner wall surface of the fixing hole, so that when a first heat exchange medium such as high-temperature gas or liquid flows through the heat exchange pipe, the heat in the first heat exchange medium such as high-temperature gas or liquid is transferred to the solid heat storage material, that is, the corresponding heat storage process is realized. Conversely, when a second heat exchange medium such as low-temperature gas or liquid flows through the heat exchange pipe, the heat stored in the solid heat storage material can be transferred to the solid heat storage material. The stored heat is released to a second heat exchange medium such as a low-temperature gas or liquid, that is, a corresponding heat release process is realized. Therefore, the heat storage device provided by the present disclosure can realize heat exchange between the heat exchange medium and the solid heat storage material, thereby realizing the corresponding heat storage and heat release process. Compared with the related art that requires converting electrical energy into thermal energy before storing energy, it is obvious that the heat storage device provided by the present disclosure realizes energy storage and reuse by directly exchanging heat between the heat exchange medium and the solid heat storage material, so that the energy utilization rate is higher, and because the material of the solid heat storage material does not need to be limited to the insulating material, the applicability of the entire heat storage device is also higher. In addition, because the heat exchange branch pipe of the heat exchange pipeline is inserted into the fixed hole of the solid heat storage material and connected with the wall surface, it can ensure a high heat exchange efficiency while effectively improving the reliability of the entire heat storage device, which is conducive to ensuring that the heat storage device can work stably.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 is a schematic structural diagram of a heat storage device provided in an exemplary embodiment of the present disclosure;

[0021] Figure 2 is a left side view of a heat storage device provided in an exemplary embodiment of the present disclosure;

[0022] Figure 3 yes Figure 2 Cross-sectional view at the AA position;

[0023] Figure 4 yes Figure 2 Cross-section view at the mid-BB position;

[0024] Figure 5 is a schematic structural diagram of a heat exchange pipeline of a heat storage device provided in a first embodiment of the present disclosure;

[0025] Figure 6 is a schematic structural diagram of a heat exchange pipeline of a heat storage device provided in a second embodiment of the present disclosure;

[0026] Figure 7 is an exploded schematic diagram of a heat exchange pipe of a heat storage device provided in a second embodiment of the present disclosure;

[0027] Figure 8 is a front view of a heat storage brick layer of a heat storage device provided in a first embodiment of the present disclosure;

[0028] Fig. 9 is a top view of a heat storage brick layer of a heat storage device provided in a first embodiment of the present disclosure;

[0029] Fig.10 is a front view of a heat storage brick layer of a heat storage device provided in a second embodiment of the present disclosure;

[0030] Fig.11 is a top view of a heat storage brick layer of a heat storage device provided in a second embodiment of the present disclosure;

[0031] Fig.12 is a schematic diagram of a thermal storage system provided in a first embodiment of the present disclosure;

[0032] Fig.13 is a schematic diagram of a thermal storage system provided in a second embodiment of the present disclosure;

[0033] Fig.14 is a schematic diagram of a framework of a heat storage system provided in a first embodiment of the present disclosure and provided with a heat exchange unit;

[0034] Fig.15 It is a schematic diagram of a framework of a heat storage system provided in a second embodiment of the present disclosure and provided with a heat exchange unit.

[0035] Description of Reference Numerals

[0036] 1-heat storage box; 110-heat storage chamber; 120-insulation layer; 130-heat resistant support structure; 2-solid heat storage material; 210-fixing hole; 211-hole; 212-groove; 220-heat storage brick layer; 221-brick layer; 2211-heat storage brick body; 3-heat exchange pipeline; 310-heat exchange branch pipe; 320-upper pipeline; 330-lower pipeline; 340-first inlet end; 350-first outlet end; 360-heat exchange main pipe; 361-first heat exchange branch pipe; 362-second heat exchange branch pipe; 370-first heat exchange pipeline; 380-second heat exchange pipeline; 381-third inlet end; 382-third outlet end; 4-heat exchange medium supply pipeline; 410-first heat exchange medium supply pipeline; 420-second heat exchange medium supply pipeline; 5-heat exchange Hot working medium discharge pipeline; 510-first heat exchange working medium discharge pipeline; 520-second heat exchange working medium discharge pipeline; 6-first bypass pipeline; 7-first control valve; 8-second bypass pipeline; 9-second control valve; 10-heat exchange unit; 1010-second inlet end; 1020-second outlet end; 11-first working medium inlet; 12-first working medium outlet; 13-first regulating valve; 14-third control valve; 15-second working medium inlet; 16-second working medium outlet; 17-third working medium inlet; 18-third working medium outlet; 19-second regulating valve; 20-fourth control valve; 21-fifth control valve; 22-third bypass pipeline; 23-fourth bypass pipeline; 24-sixth control valve; 25-first circulation pump; 26-seventh control valve; 27-second circulation pump. DETAILED DESCRIPTION

[0037] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0038] In the present disclosure, for the convenience of description, a three-coordinate system, namely, an XYZ coordinate system, is defined for the thermal storage device, wherein Figure 5 As shown, the Z direction corresponds to the height direction of the heat storage device when in use, that is, the third direction; the X direction corresponds to the width direction of the heat storage device, that is, the first direction; and the Y direction corresponds to the length direction of the heat storage device, that is, the second direction. Unless otherwise specified, the directional words used, such as "upper and lower", usually refer to the upper and lower parts of the space when the heat storage device is in use. "Inside and outside" refer to the inside and outside relative to the outline of the component or structure itself. In addition, it should be noted that the terms used, such as "first, second", etc., are used to distinguish one element from another and do not have order and importance. In addition, in the description of the reference figures, the same marks in different figures represent the same elements.

[0039] According to a first aspect of the present disclosure, a heat storage device is provided, referring to Figures 1 to 11As shown, the heat storage device includes a heat storage box 1, a solid heat storage material 2 and a heat exchange pipe 3. The heat storage box 1 has a heat storage chamber 110 inside; the solid heat storage material 2 is arranged in the heat storage chamber 110 and a fixing hole 210 is opened on the solid heat storage material 2; the heat exchange pipe 3 includes a heat exchange branch pipe 310 located in the heat storage chamber 110 and inserted in the fixing hole 210, and the outer wall surface of the heat exchange branch pipe 310 is heat-conductively connected to the inner wall surface of the fixing hole 210.

[0040] Through the above technical solution, that is, the heat storage device provided by the present invention, the solid heat storage material 2 is arranged in the heat storage chamber 110 of the heat storage box 1, and the solid heat storage material 2 is provided with a fixing hole 210 for inserting the heat exchange branch pipe 310 of the heat exchange pipe 3, and at the same time, the outer wall surface of the heat exchange branch pipe 310 is heat-conductingly connected to the inner wall surface of the fixing hole 210, so that when the first heat exchange medium such as high-temperature gas or liquid flows through the heat exchange pipe 3, the heat in the first heat exchange medium such as high-temperature gas or liquid is transferred to the solid heat storage material 2, that is, the corresponding heat storage process is realized. Conversely, when the second heat exchange medium such as low-temperature gas or liquid flows through the heat exchange pipe 3, it can It is able to release the heat stored in the solid heat storage material 2 to a second heat exchange medium such as a low-temperature gas or liquid, that is, to realize the corresponding heat release process. Therefore, the heat storage device provided by the present disclosure can realize heat exchange between the heat exchange medium and the solid heat storage material 2, thereby realizing the corresponding heat storage and heat release process. Compared with the related art that needs to convert electrical energy into thermal energy before storing energy, it is obvious that the heat storage device provided by the present disclosure realizes energy storage and reuse by directly exchanging heat between the heat exchange medium and the solid heat storage material, so that the energy utilization rate is higher, and because the material of the solid heat storage material 2 does not need to be limited to insulating materials, the applicability of the entire heat storage device is also higher. In addition, because the heat exchange branch pipe 310 of the heat exchange pipe 3 is inserted into the fixing hole 210 of the solid heat storage material 2 and the wall is closely connected, it can ensure a high heat exchange efficiency while effectively improving the reliability of the entire heat storage device, which is conducive to ensuring that the heat storage device can work stably.

[0041] It should be noted that the first heat exchange medium such as the high-temperature gas or liquid mentioned above can be, for example, medium-high temperature steam from a power plant boiler or a steam turbine, high-temperature flue gas from a boiler, or high-temperature exhaust gas from an industrial device, and the second heat exchange medium such as the low-temperature gas or liquid mentioned above can be, for example, a low-temperature medium such as water, air, nitrogen, etc., and the present disclosure does not make specific limitations on this.

[0042] In some embodiments, reference Figure 8As shown, the solid heat storage material 2 can be constructed as a heat storage brick layer 220, and a plurality of fixing holes 210 extending along the first direction and penetrating the heat storage brick layer 220 are opened on the heat storage brick layer 220, and a plurality of heat exchange branch pipes 310 are plugged into the corresponding fixing holes 210 one by one. The overall structure is simple, which ensures that the heat storage device has high reliability and is convenient for on-site optimization and transformation.

[0043] The solid heat storage material 2 may be a sensible heat storage material such as concrete, metal, ceramic, or a latent heat storage material such as molten salt, alloy, or composite, and the present disclosure does not specifically limit such deformation modes. In addition, in order to better ensure that the heat storage device has a higher structural stability, the solid heat storage material 2 is processed into a block-shaped heat storage brick layer 220, so that the overall heat storage device can have a higher structural stability.

[0044] In addition, it should be noted that, taking into account the influence of the processing accuracy of the fixing hole 210 of the heat storage brick layer 220, for example, in some embodiments, the processing accuracy of the fixing hole 210 of the heat storage brick layer 220 is relatively high, so that when the heat exchange pipe 3 is inserted into the fixing hole 210, the outer wall surface of the heat exchange pipe 3 can be tightly fitted to the inner wall surface of the fixing hole 210, that is, the outer wall surface of the heat exchange branch pipe 310 can be thermally fitted to the inner wall surface of the fixing hole 210. In this way, it can ensure high heat exchange efficiency while also having high reliability.

[0045] However, in other embodiments, the processing accuracy of the fixing hole 210 of the heat storage brick layer 220 is low, and there may be a gap between the outer wall surface of the heat exchange pipe 3 and the inner wall surface of the fixing hole 210, thereby affecting the heat exchange effect and reliability. For this reason, in some embodiments not shown in the figure, the outer wall surface of the heat exchange pipe 3 and the inner wall surface of the fixing hole 210 may be filled with heat-conductive powder. For example, the heat-conductive powder may be the above-mentioned solid heat storage material 2 processed into powder and filled between the outer wall surface of the heat exchange pipe 3 and the inner wall surface of the fixing hole 210, or, for example, it may be a mixture obtained by uniformly mixing carbonaceous components, graphite components, or carbonaceous components, graphite components and inorganic oxide particles in a certain proportion, and then preparing the mixture into powder and filling it between the outer wall surface of the heat exchange pipe 3 and the inner wall surface of the fixing hole 210. In this way, a heat-conductive connection between the heat exchange branch pipe 310 and the fixing hole 210 can be achieved.

[0046] Among them, it should be noted that the above-mentioned carbonaceous component may include amorphous carbon, which is formed by high-temperature carbonization of a binder (asphalt or resin), the graphite component includes at least one of natural graphite and artificial graphite, and the inorganic oxide particles include at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide and silicon carbide. Based on the total weight of the thermal conductive powder, the amount of the carbonaceous component is 8-30% by weight, the amount of the graphite component is 70-92% by weight, and the amount of the inorganic oxide particles is 0-15% by weight. Specifically, the inorganic oxide particles have a particle size of 50-200μm and contain at least one of silicon oxide, boron oxide, zirconium oxide, titanium oxide and silicon carbide. In this way, a thermal conductive powder with a thermal conductivity of up to 100W / mk can be prepared.

[0047] Of course, since the heat storage temperature of the heat-conducting material prepared by the above method can reach up to 900°C, the thermal conductivity can reach up to 100W / mk, and the heat storage density is 900kJ / kg, the solid heat storage material 2 of the present disclosure can also be made by the above preparation method and processed into a block to ensure higher reliability and heat exchange efficiency. The present disclosure is not limited to this.

[0048] Further, in some embodiments, reference Figures 8 to 11 As shown, the plurality of fixing holes 210 can be arranged in multiple rows at equal intervals along a third direction perpendicular to the first direction, and the plurality of fixing holes 210 in the same row have the same size in a second direction perpendicular to the first direction and the third direction, and two adjacent fixing holes 210 are arranged parallel to each other, so that uniform heat exchange of the heat storage device can be achieved, thereby improving the heat storage effect. It should be noted that the first direction can refer to Fig. 9 The up and down direction of the middle drawing, the second direction can refer to Figure 8 The left and right directions of the middle figure, the third direction can be referenced Figure 8 The up and down direction of the center drawing.

[0049] Of course, it should be noted that the above-mentioned arrangement of the plurality of fixing holes 210 at equal intervals is exemplary, and in some embodiments not shown in the figure, those skilled in the art may also adaptively adjust the spacing between two adjacent fixing holes 210 in the plurality of fixing holes 210 according to actual application requirements, that is, the plurality of fixing holes 210 may not be arranged at equal intervals. The present disclosure is not limited thereto.

[0050] In addition, in some embodiments, reference Figures 8 to 11As shown, the heat storage brick layer 220 may include a plurality of brick layers 221 stacked along a third direction, and each brick layer 221 includes a plurality of heat storage brick bodies 2211 sequentially arranged along the first direction and / or the second direction. In this way, the heat storage brick layer 220 is formed by stacking multiple brick layers 221, which ensures high reliability and facilitates on-site optimization and transformation.

[0051] The fixing hole 210 may be constructed in any suitable manner, for example, Fig.10 It is exemplarily shown that the fixing hole 210 may include a channel 211 penetrating the heat storage brick body 2211 along the first direction; and / or, Figure 8 It is exemplarily shown that the fixing hole 210 may also include a groove 212 extending along the first direction and formed on the surface of the heat storage brick body 2211, and the groove 212 and the groove 212 of the adjacent heat storage brick body 2211 together form the fixing hole 210. In this way, the above-mentioned fixing hole 210 can be formed, and the heat exchange branch pipe 310 of the heat exchange pipe 3 is thermally connected to the fixing hole 210 at the same time, so that a higher heat exchange efficiency can be ensured while also ensuring a higher reliability of the heat storage device.

[0052] Of course, it should be noted that, in the embodiment where the fixing hole 210 may include a groove 212 extending along the first direction and formed on the surface of the heat storage brick body 2211, the groove 212 may also form the above-mentioned fixing hole 210 together with the surface of the adjacent heat storage brick body 2211. That is, the above-mentioned fixing hole 210 may be formed by, for example Figure 8 The circular fixing hole 210 formed by two semicircular grooves 212 shown in the figure may also be a non-circular fixing hole 210 not shown in the figure. Those skilled in the art may adaptively design the shape of the fixing hole 210 according to actual application requirements, with the purpose of being able to adapt to the heat exchange branch pipe 310 of the heat exchange pipe 3 and realize a heat-conducting connection between the two by surface contact, but the present disclosure is not limited to this.

[0053] Further, in some embodiments, reference Figures 8 to 11 As shown, two adjacent brick layers 221 can be arranged alternately along the first direction and / or along the second direction, so that it is convenient for on-site operators to stack the heat storage brick layers 220 while ensuring that the heat storage brick layers 220 have a high structural stability. Figure 8 and Fig. 9 As shown, two adjacent brick layers 221 can be arranged alternately along the second direction, or, as shown in FIG. Fig.10 and Fig.11As shown, two adjacent brick layers 221 above and below can also be arranged alternately along the first direction. Of course, the above two specific embodiments are exemplary. In some embodiments not shown in the figure, two adjacent brick layers 221 above and below can also be arranged alternately along the first direction and / or along the second direction. The present disclosure is not limited thereto.

[0054] In some embodiments, a heat preservation and heat insulation layer 120 may be provided inside the heat storage box 1 to reduce the heat loss of the heat storage chamber 110, and a heat-resistant support structure 130 for fixing the heat exchange pipe 3 and the solid heat storage material 2 may be provided inside the heat storage chamber 110. In this way, the heat preservation and heat insulation layer 120 can reduce the heat loss inside the heat storage box 1, and the heat-resistant support structure 130 can ensure that the heat storage device as a whole has a high reliability. It should be noted that the above-mentioned heat preservation and heat insulation layer 120 and the heat-resistant support structure 130 can be formed by a partition structure made of any known insulation material in the art, such as a fireproof insulation board, an insulation color steel sandwich board, etc., according to actual application requirements, and the above-mentioned heat-resistant support structure 130 can be prepared by, for example, an aluminum plate or an alloy steel plate, etc., and the present disclosure does not make specific limitations on this.

[0055] In some embodiments, reference Figures 3 to 7 As shown, the heat exchange pipe 3 may also include an upper pipe 320 and a lower pipe 330 located in the heat storage chamber 110, one of the upper pipe 320 and the lower pipe 330 has a first inlet end 340, and the other has a first outlet end 350, and the first inlet end 340 and the first outlet end 350 are respectively located at two opposite outer sides of the heat storage box 1; and the upper pipe 320 and the lower pipe 330 both include a heat exchange main pipe 360 ​​extending along the second direction, and the two heat exchange main pipes 360 are respectively provided with a plurality of first heat exchange branch pipes 361 and second heat exchange branch pipes 361 spaced and arranged in parallel along the second direction. 2, the first heat exchange branch pipe 361 and the second heat exchange branch pipe 362 are both extended along the third direction and are arranged in parallel in a one-to-one correspondence. The first heat exchange branch pipe 361 and the second heat exchange branch pipe 362 arranged in parallel along the first direction are both connected with a plurality of heat exchange branch pipes 310 arranged in parallel. In this way, through the structural arrangement of the above-mentioned heat exchange pipe, the heat exchange medium entering the heat exchange pipe 3 through the first inlet end 340 can be fully heat exchanged with the solid heat storage material 2 in the heat storage chamber 110 and then discharged through the first outlet end 350, thereby ensuring a high heat exchange effect and effectively improving the energy utilization rate.

[0056] It should be noted that the second direction and the third direction intersect, and the first direction is perpendicular to the plane where the second direction and the third direction are located. In addition, the heat exchange pipe 3 can be made of materials such as carbon steel, low alloy steel and stainless steel, which is not specifically limited in the present disclosure.

[0057] According to a second aspect of the present disclosure, a heat storage system is also provided, referring to Figures 12 to 15 As shown, the heat storage system includes the above-mentioned heat storage device. In this way, the heat storage system can not only effectively improve the energy utilization rate by providing the heat storage device, but also ensure high heat exchange efficiency and system reliability. In addition, the heat storage system has all the beneficial effects of the above-mentioned heat storage device, which will not be repeated in this disclosure.

[0058] It should be noted that if Fig.12 As shown, in some embodiments, the number of heat exchange pipes 3 can be one, and the heat exchange pipe 3 is used for the circulation of the first heat exchange medium or the second heat exchange medium, wherein, in the heat storage state, the solid heat storage material 2 stores the heat in the first heat exchange medium into the solid heat storage material 2 after heat exchange with the first heat exchange medium, and in the heat release state, the solid heat storage material 2 transfers the heat stored in the solid heat storage material 2 to the second heat exchange medium after heat exchange with the second heat exchange medium. In this way, the corresponding heat storage process or heat release process can be completed through one heat exchange pipe 3, and the overall system is relatively simple, which is convenient for on-site optimization and transformation. Or, as Figure 6 and Fig.13 As shown, the number of heat exchange pipes 3 can also be two and include a first heat exchange pipe 370 and a second heat exchange pipe 380. The first heat exchange pipe 370 is used for the circulation of the first heat exchange medium, and the second heat exchange pipe 380 is used for the circulation of the second heat exchange medium. In this way, the corresponding heat storage process and heat release process can be realized respectively through the two heat exchange pipes 3, thereby improving the service life of the heat exchange pipe 3. The present disclosure does not specifically limit such deformation methods, and those skilled in the art can adaptively select a specific arrangement method according to actual application requirements.

[0059] In some embodiments, reference Fig.12 As shown, taking the case where the number of heat exchange pipes 3 is one as an example, specifically, the number of heat exchange pipes 3 is one and the two ends are respectively connected with a heat exchange working medium supply pipe 4 and a heat exchange working medium discharge pipe 5, and the heat exchange working medium supply pipe 4 and the heat exchange working medium discharge pipe 5 respectively have a first working medium inlet 11 and a first working medium outlet 12, so that the heat exchange working medium can enter the heat exchange working medium supply pipe 4 through the first working medium inlet 11 and be guided into the heat storage box 1 to exchange heat with the solid heat storage material 2, and then be discharged through the first working medium outlet 12 of the heat exchange working medium discharge pipe 5, thereby completing the corresponding heat storage process or heat release process.

[0060] in addition, Fig.12It is also exemplarily shown that a first bypass pipe 6 is connected between the heat exchange working medium supply pipe 4 and the heat exchange working medium discharge pipe 5, and a first control valve 7 is arranged on the first bypass pipe 6. In this way, when the heat storage system is in, for example, a heat release process, the first control valve 7 is in an open state. In this way, as the low-temperature working medium is transported to the heat storage tank 1 through the heat exchange working medium supply pipe 4 to absorb heat and then discharged through the heat exchange working medium discharge pipe 5, part of the low-temperature working medium can also be directly guided to the heat exchange working medium discharge pipe 5 through the first bypass pipe 6 according to the heat demand of the downstream user connected at the first working medium outlet 12 to mix with the low-temperature working medium after heat absorption, thereby adaptively adjusting the low-temperature working medium flow to obtain the working medium of the target temperature, so that the heat demand of the downstream users can be met more efficiently. In addition, the first bypass pipe 6 can be provided with a first regulating valve 13 to control the flow rate of the low-temperature medium, and the heat exchange medium supply pipe 4 and the heat exchange medium discharge pipe 5 are respectively provided with a third control valve 14 on one side close to the first working medium inlet 11 and the first working medium outlet 12 to control the opening and closing of the heat exchange medium supply pipe 4 and the heat exchange medium discharge pipe 5.

[0061] In some embodiments, reference Fig.13 As shown, taking the case where the number of heat exchange pipes 3 is two as an example, specifically, the number of heat exchange pipes 3 is two, the two ends of the first heat exchange pipe 370 are respectively connected with the first heat exchange medium supply pipe 410 and the first heat exchange medium discharge pipe 510, and the two ends of the second heat exchange pipe 380, that is, the third inlet end 381 and the third outlet end 382, ​​are respectively connected with the second heat exchange medium supply pipe 420 and the second heat exchange medium discharge pipe 520, and the first heat exchange medium supply pipe 410 and the first heat exchange medium discharge pipe 510 respectively have the second working medium inlet 15 and the second working medium outlet 16, and the second heat exchange medium supply pipe 420 and the second heat exchange medium discharge pipe 520 respectively have the third working medium inlet 17 and the third working medium outlet 18, so that the heat storage process can be completed after the first heat exchange medium such as high-temperature gas or liquid flows through the first heat exchange pipe 370, and the heat release process can be completed after the second heat exchange medium such as low-temperature gas or liquid flows through the second heat exchange pipe 380.

[0062] in addition, Fig.13It is also exemplarily shown that a second bypass pipe 8 is connected between the second heat exchange working medium supply pipe 420 and the second heat exchange working medium discharge pipe 520, and a second control valve 9 is arranged on the second bypass pipe 8. In this way, when the heat storage system is in, for example, a heat release process, the second control valve 9 is in an open state. In this way, as the low-temperature second heat exchange working medium is transported to the heat storage tank 1 through the second heat exchange working medium supply pipe 420 to absorb heat and then discharged through the second heat exchange working medium discharge pipe 520, part of the low-temperature second heat exchange working medium can also be directly guided to the second heat exchange working medium discharge pipe 520 through the second bypass pipe 8 according to the heat demand of the downstream user connected at the third working medium outlet 18 to mix with the low-temperature second heat exchange working medium after heat absorption, thereby adaptively adjusting the flow rate of the low-temperature second heat exchange working medium to obtain the working medium of the target temperature, so that the heat demand of the downstream users can be met more efficiently. In addition, the second bypass pipe 8 can be provided with a second regulating valve 19 to control the flow rate of the low-temperature medium, and the first heat exchange working fluid supply pipe 410, the second heat exchange working fluid supply pipe 420, the first heat exchange working fluid discharge pipe 510 and the second heat exchange working fluid discharge pipe 520 are respectively provided with a fourth control valve 20 on one side close to the second working fluid inlet 15, the third working fluid inlet 17, the second working fluid outlet 16 and the third working fluid outlet 18 to control the opening and closing of the corresponding pipes.

[0063] In some embodiments, reference Fig.14 and Fig.15 As shown, the heat storage system may further include a heat exchange unit 10, which has a second inlet port 1010 and a second outlet port 1020 respectively connected to the two ends of the heat exchange pipe 3, and is used to guide the heat exchange medium after heat exchange in the heat storage device into the heat exchange unit 10 and perform heat exchange with an external heat-using device, so that the heat storage system can be constructed as a closed circulation system, thereby improving energy utilization.

[0064] Here, taking the case where the number of heat exchange pipes 3 is one as an example, refer to Fig.14As shown, the heat exchange medium supply pipeline 4 and the heat exchange medium discharge pipeline 5 are respectively provided with a fifth control valve 21, and the two ends of the two fifth control valves 21 are also connected with a third bypass pipeline 22 and a fourth bypass pipeline 23, respectively. The third bypass pipeline 22 is provided with a sixth control valve 24 and a first circulation pump 25 in sequence along the flow direction of the heat exchange medium, and the fourth bypass pipeline 23 is provided with a seventh control valve 26 and a second circulation pump 27 in sequence along the flow direction of the heat exchange medium, and the connection between the third bypass pipeline 22 and the heat exchange medium discharge pipeline 5 is located above the connection between the second inlet end 1010 and the heat exchange medium discharge pipeline 5. The heat exchange medium discharge pipe 5 is arranged upstream, and the connection between the second inlet end 1010 and the heat exchange medium discharge pipe 5 is arranged upstream of the third control valve 14 on the heat exchange medium discharge pipe 5. Further, the connection between the fourth bypass pipe 23 and the heat exchange medium supply pipe 4 is arranged downstream of the connection between the second outlet end 1020 and the heat exchange medium supply pipe 4. At the same time, the connection between the second outlet end 1020 and the heat exchange medium supply pipe 4 is arranged downstream of the third control valve 14 on the heat exchange medium supply pipe 4. In this way, the heat storage and heat release processes of the heat exchange medium share a set of heat exchange pipes 3 and are closed and circulated in the system.

[0065] Specifically, for example, the heat exchange medium can enter the system from the first medium inlet 11 and be discharged from the system from the first medium outlet 12. During the heat storage process, the low-temperature medium exchanges heat with other mediums in the heat exchange unit 10, absorbs heat from the heat source, and after the temperature rises, enters the heat storage box 1 to release the heat to the solid heat storage material 2. After the temperature drops, it returns to the heat exchange unit 10 to continue to take heat. At the same time, during the heat storage process, the first circulation pump 25 is turned on, and the heat exchange medium passes through the first circulation pump 25. At this time, the fifth control valve 21 on the heat exchange medium discharge pipeline 5 is in a closed state, and the second circulation pump 27 and the seventh control valve 26 are turned on. They are also in a closed state; on the contrary, during the heat release process, the low-temperature working fluid can enter the heat storage tank 1 to absorb heat. After the temperature rises, it enters the heat release unit to exchange heat with other working fluids, thereby meeting the heat demand of the external heat-using equipment. After the temperature drops, it returns to the heat storage tank 1 to absorb heat. During heat release, the second circulation pump 27 and the seventh control valve 26 are opened, and the low-temperature working fluid passes through the second circulation pump 27. At this time, the fifth control valve 21 on the heat exchange working fluid supply pipeline 4 is closed, and the first circulation pump 25 and the sixth control valve 24 are closed, and the corresponding fifth control valve 21 on the heat exchange working fluid discharge pipeline 5 is in an open state.

[0066] Of course, it should be noted that the specific embodiment in which the heat exchange unit 10 is provided when the number of the heat exchange pipe 3 is one is exemplary. Fig.15As shown, when the number of heat exchange pipes 3 is two, the above-mentioned heat exchange unit 10 can also be adaptively arranged. In this way, the heat storage process can be realized, for example, the low-temperature first heat exchange medium can enter the system from the second medium inlet 15. After the low-temperature first heat exchange medium exchanges heat with other mediums in the heat exchange unit 10, it absorbs the heat from the heat source, and after the temperature rises, it enters the heat storage box 1 to release heat. After the temperature drops, it returns to the heat exchange unit 10 again; in the heat release process, the low-temperature second heat exchange medium enters the system through the third medium inlet 17 and is guided to the heat storage box 1 to absorb heat. After the temperature rises, it is directly provided to downstream users through the third medium outlet 18. This disclosure does not specifically limit such deformation methods.

[0067] In addition, the control valve, regulating valve and circulating pump can be controlled manually or automatically by a controller, and the present disclosure does not specifically limit this. In addition, the specific structure of the heat exchange unit 10 is not specifically limited in the present disclosure. Those skilled in the art can select any heat exchanger structure known in the art, such as a tubular heat exchanger or a plate-fin heat exchanger, according to their needs, as long as the corresponding heat exchange process can be achieved.

[0068] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0070] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A heat storage device, characterized in that: include: A heat storage box having a heat storage chamber therein; A solid heat storage material is disposed in the heat storage chamber and has a fixing hole; and The heat exchange pipe comprises a heat exchange branch pipe located in the heat storage chamber and inserted in the fixing hole, and the outer wall surface of the heat exchange branch pipe is heat-conductingly connected to the inner wall surface of the fixing hole.

2. The heat storage device according to claim 1, characterized in that: The solid heat storage material is constructed as a heat storage brick layer, and a plurality of fixing holes extending along the first direction and penetrating the heat storage brick layer are opened on the heat storage brick layer, and a plurality of heat exchange branch pipes are plugged into the corresponding fixing holes one by one.

3. The heat storage device according to claim 2, characterized in that: The plurality of fixing holes are arranged in multiple rows at equal intervals along a third direction perpendicular to the first direction, and the plurality of fixing holes in the same row have the same size in a second direction perpendicular to the first direction and the third direction, and two adjacent fixing holes are arranged parallel to each other.

4. The heat storage device according to claim 2, characterized in that: The heat storage brick layer comprises a plurality of brick layers stacked along a third direction, and each of the brick layers comprises a plurality of heat storage brick bodies sequentially arranged along a first direction and / or a second direction; The fixing hole comprises a channel penetrating the heat storage brick body along a first direction; and / or, The fixing hole includes a groove extending along the first direction and formed on the surface of the heat storage brick body, and the groove and the surface of the adjacent heat storage brick body, or the groove and the groove of the adjacent heat storage brick body, together form the fixing hole.

5. The heat storage device according to claim 4, characterized in that: The brick layers of two adjacent layers above and below are arranged alternately along the first direction and / or along the second direction.

6. The heat storage device according to claim 1, characterized in that: A heat-insulating layer is also provided inside the heat storage box to reduce heat loss in the heat storage chamber, and a heat-resistant supporting structure for fixing the heat exchange pipe and the solid heat storage material is also provided inside the heat storage chamber.

7. The heat storage device according to claim 1, characterized in that: The heat exchange pipeline further includes an upper pipeline and a lower pipeline located in the heat storage chamber, one of the upper pipeline and the lower pipeline has a first inlet end, and the other has a first outlet end, and the first inlet end and the first outlet end are respectively located at two opposite outer sides of the heat storage box; The upper pipe and the lower pipe each include a heat exchange main pipe extending in the second direction, and the two heat exchange main pipes are respectively provided with a plurality of first heat exchange branch pipes and second heat exchange branch pipes spaced apart and arranged in parallel in the second direction, the first heat exchange branch pipes and the second heat exchange branch pipes both extend in the third direction and are arranged in parallel in a one-to-one correspondence, and the first heat exchange branch pipes and the second heat exchange branch pipes arranged in parallel in the first direction are both connected with a plurality of the heat exchange branch pipes arranged in parallel; The second direction intersects with the third direction, and the first direction is perpendicular to a plane where the second direction and the third direction are located.

8. The heat storage device according to any one of claims 1 to 7, characterized in that: The solid heat storage material is a sensible heat storage material or a latent heat storage material.

9. A heat storage system, characterized in that: A heat storage device comprising any one of claims 1 to 8; The number of the heat exchange pipe is one, and the heat exchange pipe is used for the circulation of the first heat exchange medium or the second heat exchange medium; or the number of the heat exchange pipes is two and includes a first heat exchange pipe and a second heat exchange pipe, the first heat exchange pipe is used for the circulation of the first heat exchange medium, and the second heat exchange pipe is used for the circulation of the second heat exchange medium; Among them, in the heat storage state, the solid heat storage material stores the heat in the first heat exchange working medium into the solid heat storage material after heat exchange with the first heat exchange working medium, and in the heat release state, the solid heat storage material transfers the heat stored in the solid heat storage material to the second heat exchange working medium after heat exchange with the second heat exchange working medium.

10. The thermal storage system according to claim 9, characterized in that: The number of the heat exchange pipeline is one, and the two ends are respectively connected with a heat exchange medium supply pipeline and a heat exchange medium discharge pipeline. A first bypass pipeline is connected between the heat exchange medium supply pipeline and the heat exchange medium discharge pipeline, and a first control valve is arranged on the first bypass pipeline.

11. The thermal storage system according to claim 9, characterized in that: There are two heat exchange pipes, and the two ends of the first heat exchange pipe are respectively connected to the first heat exchange medium supply pipe and the first heat exchange medium discharge pipe, and the two ends of the second heat exchange pipe are respectively connected to the second heat exchange medium supply pipe and the second heat exchange medium discharge pipe, and a second bypass pipe is connected between the second heat exchange medium supply pipe and the second heat exchange medium discharge pipe, and a second control valve is arranged on the second bypass pipe.

12. The thermal storage system according to claim 9, characterized in that: The heat storage system also includes a heat exchange unit having a second inlet end and a second outlet end respectively connected to the two ends of the heat exchange pipe, and is used to guide the heat exchange medium after heat exchange in the heat storage device into the heat exchange unit and perform heat exchange with external heat-using equipment.

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