Heat storage device

Abstract

The utility model relates to a heat storage device which comprises a heat storage container and a fluid pump, the heat storage container is tubular and vertically extends, and an inner cavity of the heat storage container is of an up-down through structure, so that the actual unit volume of the heat storage container is increased, and meanwhile, the occupied area of the unit volume is reduced; and solid heat storage particles can be filled after the device main body is installed, the installation work amount can be greatly reduced, the installation period can be shortened, the capacity of the heat storage container can be designed according to needs, and the influence of factors such as transportation and hoisting is avoided. And the heat exchange efficiency of the heat-conducting fluid can be improved. In addition, integration of heat storage and heat exchange can be achieved, and after long-time shutdown, the whole device can recover to operate within a short time only by introducing steam into the heat exchange pipe. In addition, the fluid pump can be a short-rod fluid pump (below 2 meters), and compared with an existing long-rod fluid pump (above 10 meters), the cost can be reduced, the service life of the fluid pump can be prolonged, and the overall service life of the device can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heat conducting fluid heat storage, especially to a heat storage device. BACKGROUND

[0002] The double-tank system is a traditional high-temperature molten salt heat storage system and is currently the main technology adopted. However, the double-tank system currently has the following problems: (1) complex structure and operation: including complex system connection and auxiliary facilities, which leads to complicated installation and operation; (2) high cost and short service life of the molten salt pump: a long-rod molten salt pump must be used, and the service life is only 1.5 years; (3) complicated operation and maintenance, and low reliability: the molten salt cannot solidify in the tank during the use period, and many safeguards must be provided.

[0003] Therefore, a Chinese invention patent with the patent number ZL202210608538.5 (the authorized announcement number CN114838611B) discloses a high-temperature heat exchange and heat storage unit, structure and device, and specifically discloses the following content: the high-temperature heat exchange and heat storage unit in the high-temperature heat exchange and heat storage structure is at least two and stacked in layers, wherein the fluid outlet of the shell of any one high-temperature heat exchange and heat storage unit is in fluid communication with the fluid inlet of the shell of another high-temperature heat exchange and heat storage unit located below the high-temperature heat exchange and heat storage unit, and the heat exchange pipes in the shells of the high-temperature heat exchange and heat storage units are sequentially connected. The high-temperature heat exchange and heat storage unit includes a shell filled with solid heat storage particles and capable of isolating the solid heat storage particles inside, the upper end of the shell has a fluid inlet for the inflow of high-temperature heat conducting fluid, the bottom wall is provided with a fluid outlet for the outflow of heat-exchanged heat conducting fluid, and the shell is respectively provided with an overflow port, an overflow pipe for the flow of heat conducting fluid, and a heat exchange pipe for the passage of fluid to be heated, wherein the overflow pipe connects the overflow port and the fluid outlet of the shell, and the highest point of the overflow pipe is lower than the top end of the shell.

[0004] The modular system of the above patent simplifies the structure, improves the overall safety and reliability compared with the double-tank system. At the same time, it overcomes the problem of production, installation and operation on site of the double-tank system, shortens the construction period, and effectively improves the quality and reliability of the device. Moreover, the solid heat storage particles and molten salt are used for heat storage, which greatly reduces the amount of molten salt used (the amount of molten salt used is only 1 / 3 of that of the double-tank system), which is conducive to reducing costs. In addition, the units are independently operated, and in a project with dozens of unit combinations, the accident range is limited to one unit, and the influence is limited (the double-tank system often leads to the shutdown of the entire system). In actual engineering, the investment of the modular system with the same capacity is only 50-60% of that of the double-tank system, the cost advantage is very obvious, the occupied area is only about 50% of that of the double-tank system, the land selection advantage is significant, and the project operation cost is also very low.

[0005] However, the modular system of the above patent still has the following problems: it is necessary to ensure that the molten salt surface is in a normal pressure state, that is, the top of the module cannot be sealed (that is, the top of the shell must be open), and that the overflow structure has a certain height of liquid level difference. In order to prevent molten salt from overflowing from the top of the module, it is necessary to reserve necessary space at the upper part, and at the same time, the overflow structure causes the internal part of the module to be separated. The above factors cause the internal part of the module to be not fully utilized, which affects the storage rate per unit volume of the container. The unit capacity of the land area is still large, and due to the characteristics of the stacked combination, the filling of the solid heat storage particles must be completed before installation. Therefore, considering the transportation and lifting factors, the total weight of a single module is limited. The molten salt flows in the limited overflow pipe, which limits the flow rate of the molten salt in the module. The average flow rate is only 1-2 mm / s, which is not conducive to heat exchange. Utility model content

[0006] The first technical problem to be solved by the utility model is to provide a heat storage container with a large actual average volume and a small unit volume land area.

[0007] The second technical problem to be solved by the utility model is to provide a heat storage container with a large capacity and convenient installation.

[0008] The third technical problem to be solved by the utility model is to provide a heat storage device with good heat exchange performance of the heat conducting fluid.

[0009] The fourth technical problem to be solved by the utility model is to provide a heat storage device that can avoid the solidification of the heat conducting fluid in the running state and is convenient to recover after long-term shutdown.

[0010] The fifth technical problem to be solved by the utility model is to provide a heat storage device with a long service life of the fluid pump.

[0011] The technical scheme adopted by the utility model to solve at least one of the above technical problems is: a heat storage device, comprising a heat storage container and a fluid pump for conveying a heat conducting fluid, characterized in that the heat storage container is tubular and closed at the upper end, and the heat storage container extends vertically, and the heat storage container is filled with solid heat storage particles with a density greater than the heat conducting fluid and capable of exchanging heat with the heat conducting fluid, and the solid heat storage particles can be isolated in the heat storage container,

[0012] The upper end of the heat storage container is provided with a fluid inlet, and the lower end is provided with a fluid outlet. The pump tank of the fluid pump stores the heat conducting fluid, and the output end of the pump tank is in fluid communication with the fluid inlet, and the input end is in fluid communication with the fluid outlet,

[0013] The heat exchanger includes heat exchange pipes arranged in the heat storage container along the length direction of the heat storage container, and in the operating state, water flowing into one end of the heat exchange pipes is heated into steam in the heat exchange pipes and then flows out from the other end, or steam flowing into one end of the heat exchange pipes is condensed in the heat exchange pipes and then flows out from the other end.

[0014] Further, the heat exchange pipes are arranged in a spiral along the length direction of the heat storage container, and the radius of the heat exchange pipes matches the inner diameter of the heat storage container. On one hand, the heat exchange pipes can fully exchange heat with the solid heat storage particles and / or the heat-conducting fluid, improving the heat exchange efficiency; on the other hand, the heat exchange pipes are conveniently installed in the heat storage container, only needing to be welded and fixed at both ends of the heat exchange pipes.

[0015] Further, a flow guide is arranged for changing the flow direction of the heat-conducting fluid in the heat storage container. The flow guide can strengthen the flow diffusion of the heat-conducting fluid, thereby improving the heat exchange capacity.

[0016] Further, the flow guide includes flow guide pieces arranged in the solid heat storage particles in the heat storage container in a transverse direction. The flow guide pieces can guide the radial flow of the heat-conducting fluid in the solid heat storage particles, thereby improving the radial temperature difference caused by the non-uniform vertical flow of the heat-conducting fluid, optimizing the cross-sectional temperature field, and further improving the heat storage effect.

[0017] Further, an electric heater is arranged for heating the heat-conducting fluid, wherein the input end of the electric heater is in fluid communication with the output end of the pump tank, and the output end of the electric heater is in fluid communication with the fluid inlet. In the electric heat storage mode, the heat-conducting fluid is heated by the electric heater to become high-temperature heat-conducting fluid, which then enters the heat storage container, and the high-temperature heat-conducting fluid heats the solid heat storage particles in the process of downward circulation, thereby increasing the temperature of the solid heat storage particles and completing the heat storage process.

[0018] Further, the heat storage container is at least two heat storage containers arranged side by side, and the side walls of each heat storage container are respectively provided with a communication port, and the heat-conducting fluid in the adjacent heat storage containers is in fluid communication through the communication ports. The heat-conducting fluid can flow and exchange heat between the heat storage containers, and the upward and downward flow and heat exchange in each heat storage container can improve the heat exchange effect of the heat-conducting fluid and facilitate the uniform distribution of the temperature field in each heat storage container.

[0019] Further, the communication ports of the adjacent heat storage containers are arranged opposite to each other and are connected by a horizontally extending communication pipe. The horizontal circulation between the adjacent heat storage containers and the upward and downward flow in each heat storage container can further improve the heat exchange effect of the heat-conducting fluid.

[0020] Furthermore, each of the aforementioned heat storage containers is internally divided into a fluid layer containing only heat-conducting fluid and a mixed layer below the fluid layer. The mixed layer contains both the aforementioned solid heat storage particles and the heat-conducting fluid. Each connection port is located on the sidewall corresponding to the fluid layer of its respective heat storage container. This eliminates the need for filter structures at each connection port, thus avoiding complicating the internal structure of each heat storage container.

[0021] Furthermore, a filter screen is horizontally provided at the lower end of the heat storage container, allowing the heat-conducting fluid to permeate. This filter screen is located above the fluid outlet, and its pore size is smaller than the particle size of the solid heat storage particles. This isolates the solid heat storage particles within the heat storage container, preventing them from escaping from the containers.

[0022] Furthermore, each of the aforementioned heat storage containers has a fluid outlet at its bottom, and also includes a first conveying pipe horizontally positioned below each heat storage container. The wall of this first conveying pipe has first guide ports corresponding to each heat storage container, and each first guide port is fluidly connected to the fluid outlet of its corresponding heat storage container. One end of the first conveying pipe is closed, while the other end is fluidly connected to the input end of the pump tank. This design allows the heat-conducting fluid in each heat storage container to flow smoothly back to the pump tank of the fluid pump. Furthermore, the interconnected bottoms of each heat storage container, combined with the connecting ports, enable better circulation of the heat-conducting fluid within each container, further enhancing the heat exchange effect.

[0023] Compared with the prior art, the advantages of this utility model are as follows: the heat storage container is tubular and extends vertically, so the inner cavity of the heat storage container is a vertically connected structure. Compared with the prior art, the actual average volume of the heat storage container is increased, while the floor space per unit volume is reduced. Furthermore, solid heat storage particles can be filled after the main body of the device is installed, which can significantly reduce the amount of installation work and shorten the installation period. Moreover, the capacity of the heat storage container can be designed to be as large as needed (the height can be up to 15 meters), avoiding the influence of transportation and lifting factors.

[0024] Furthermore, the through-hole structure of the thermal storage container allows the solid thermal storage particles and the heat transfer fluid to be layered vertically within it during operation, while the temperature field tends to be higher at the top and lower at the bottom. Combined with a fluid pump, this facilitates the vertical flow of the heat transfer fluid within the thermal storage container, thereby improving heat exchange efficiency.

[0025] Furthermore, the heat exchanger design prevents the heat-conducting fluid in the heat storage container from solidifying during operation, thus eliminating the complex structure and operation required in existing technologies, improving operational reliability, and integrating heat storage and heat exchange. Moreover, after a long period of shutdown, simply introducing steam into the heat exchange tubes allows the entire device to resume operation quickly. In addition, the fluid pump in this invention can be a short-rod fluid pump (less than 2 meters), which, compared to existing long-rod fluid pumps (more than 10 meters), reduces costs, extends the pump's service life, and consequently extends the overall service life of the device. Attached Figure Description

[0026] Fig. 1 This is a schematic diagram of the heat storage device in Embodiment 1 of this utility model;

[0027] Fig. 2 This is a schematic diagram of the heat exchange tube in Embodiment 1 of this utility model. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] like Figs. 1-2As shown, a heat storage device includes a heat storage container 1 and a fluid pump 2 for conveying a heat-conducting fluid. The heat storage container 1 is tubular and closed at the top, extending vertically. The container is filled with solid heat storage particles 3, which have a density greater than the heat-conducting fluid and can exchange heat with it. These solid heat storage particles 3 are isolated within the container. The heat storage container 1 has a fluid inlet 12 at its upper end and a fluid outlet 11 at its lower end. The pump tank 21 of the fluid pump 2 stores the heat-conducting fluid. The output end of the pump tank 21 is in fluid communication with the fluid inlet 12, and the input end is in fluid communication with the fluid outlet 11. It also includes a heat exchanger for exchanging heat with the aforementioned heat-conducting fluid and solid heat storage particles 3 respectively. The heat exchanger includes a heat exchange tube 4 disposed in the heat storage container 1 along the length direction of the heat storage container 1. In the heat release operation state, water flowing in from the lower end of the heat exchange tube 4 is heated into steam in the heat exchange tube 4 and then flows out from the upper end. Alternatively, in the steam heat storage process, steam flowing in from the upper end of the heat exchange tube 4 is condensed in the heat exchange tube 4 and then flows out from the lower end.

[0031] As can be seen from the above, in this utility model, the heat storage container 1 is tubular and extends vertically. Therefore, the inner cavity of the heat storage container 1 has a vertically continuous structure. Compared with the prior art, this increases the actual average volume of the heat storage container 1 while reducing the floor space per unit volume. Furthermore, the solid heat storage particles 3 can be filled after the main body of the device is installed, significantly reducing the amount of installation work and shortening the installation period. The capacity of the heat storage container 1 can be designed to be as large as needed (the height can reach up to 15 meters), avoiding the impact of transportation and lifting factors. Moreover, the vertically continuous structure of the heat storage container 1 allows the solid heat storage particles 3 and the heat transfer fluid to be layered vertically within it during operation, with the temperature field trending upwards and downwards. Combined with the fluid pump 2, this facilitates the downward flow of the heat transfer fluid within the heat storage container 1, thereby achieving heat storage.

[0032] Furthermore, by incorporating a heat exchanger, the solidification of the heat-conducting fluid in the heat storage container 1 during operation can be prevented, thus eliminating the complex structure and operation required in existing technologies, improving operational reliability, and achieving integrated heat storage and heat exchange. Moreover, after a prolonged shutdown, simply introducing steam into the heat exchange tube 4 allows the entire device to resume operation quickly. In addition, the fluid pump 2 in this invention can be a short-rod fluid pump 2 (less than 2 meters), which, compared to existing long-rod fluid pumps 2 (more than 10 meters), reduces costs, extends the service life of the fluid pump 2, and consequently extends the overall service life of the device.

[0033] In this invention, the heat-conducting fluid is at least one of molten salt or heat-conducting oil. Molten salt and heat-conducting oil can fill the gaps between the solid heat storage particles 3, greatly reducing thermal resistance, significantly increasing the heat exchange area, achieving efficient heat exchange, and drastically reducing the temperature difference between heat exchange terminals. In this embodiment, the heat-conducting fluid is preferably liquid molten salt. The solid heat storage particles 3 are at least one of magnesium olivine or quartz, thus achieving good heat exchange and heat storage effects. Furthermore, the combination of molten salt and solid heat storage particles 3 significantly reduces costs compared to the traditional pure molten salt method (the proportional cost of solid heat storage particles 3 is only 1 / 8 of that of molten salt). Molten salt primarily serves as the heat exchange medium, while solid heat storage particles 3 primarily serve as the heat storage medium.

[0034] Furthermore, the heat exchange tube 4 is spirally arranged along the length of the heat storage container 1, and the radius of the heat exchange tube 4 matches the inner diameter of the heat storage container 1, such as... Fig. 2 As shown. On the one hand, it enables the heat exchange tube 4 to fully exchange heat with the solid heat storage particles 3 and / or the heat-conducting fluid, improving the heat exchange efficiency. On the other hand, it facilitates the installation of the heat exchange tube 4 in the heat storage container 1: simply weld both ends of the heat exchange tube 4 to the heat storage container 1. In this embodiment, the heat exchanger also includes a first fluid pipe 41 and a second fluid pipe 42 disposed outside the heat storage container 1, wherein the first fluid pipe 41 is connected to one end of the heat exchange tube 4, and the second fluid pipe 42 is connected to the other end of the heat exchange tube 4.

[0035] Furthermore, it also includes a flow guide (not shown) for changing the flow direction of the heat transfer fluid inside the heat storage container 1. The flow guide enhances the flow diffusion of the heat transfer fluid, thereby improving the heat exchange capacity. Preferably, the flow guide includes flow guide plates arranged horizontally in the solid heat storage particles 3 in the heat storage container 1, thereby guiding the radial flow of the heat transfer fluid in the solid heat storage particles 3, thereby improving the radial temperature difference caused by the uneven vertical flow of the heat transfer fluid, optimizing the cross-sectional temperature field, and further improving the heat storage effect. More preferably, the flow guides are arranged vertically at intervals along the straight line of the central axis of the heat exchange tube 4, and each flow guide includes at least two flow guide plates evenly spaced circumferentially.

[0036] Furthermore, it also includes an electric heater 5 for heating the heat-conducting fluid. The input end of the electric heater 5 is fluidly connected to the output end of the pump tank 21, and the output end of the electric heater 5 is fluidly connected to the fluid inlet 12. The heat-conducting fluid is heated by the electric heater 5 during the electric heat storage process, transforming it into a high-temperature heat-conducting fluid, which then enters the heat storage container 1. As the high-temperature heat-conducting fluid circulates downwards, it heats the solid heat storage particles 3, raising their temperature and completing the heat storage process. The heat-conducting fluid itself also has heat storage capacity. Therefore, during operation, the heat-conducting fluid acts as a heat exchange medium, exchanging heat with the electric heater 5, the heat exchanger, and the solid heat storage particles 3, while simultaneously storing heat itself as its temperature rises.

[0037] Furthermore, the aforementioned heat storage containers 1 are at least two arranged side by side, and each heat storage container 1 has a communication port 13 on its side wall, and the heat-conducting fluid in adjacent heat storage containers 1 is fluidly connected through the communication port 13. This realizes the circulation and heat exchange of the heat-conducting fluid between each heat storage container 1, and combined with the vertical flow heat exchange in each heat storage container 1, it is beneficial to improve the heat exchange effect of the heat-conducting fluid and to promote the uniform distribution of the temperature field in each heat storage container 1. In this embodiment, each heat storage container 1 is provided with the aforementioned heat exchange tube 4, and one end of each heat exchange tube 4 is connected to the aforementioned first fluid tube 41, and the other end is connected to the aforementioned second fluid tube 42.

[0038] Preferably, the connecting ports 13 of adjacent heat storage containers 1 are arranged facing each other and connected by a horizontally extending connecting pipe 14. This combines the horizontal circulation between adjacent heat storage containers 1 with the vertical flow within each heat storage container 1, further enhancing the heat exchange effect of the heat-conducting fluid. More preferably, the interior of each heat storage container 1 is divided into a fluid layer 1a containing only the heat-conducting fluid and a mixing layer 1b below the fluid layer 1a. The mixing layer 1b contains both the solid heat storage particles 3 and the heat-conducting fluid. Each connecting port 13 is located on the sidewall corresponding to the fluid layer 1a of its respective heat storage container 1. This eliminates the need for filter structures at each connecting port 13, avoiding unnecessary complexity in the internal structure of each heat storage container 1.

[0039] Furthermore, each of the above-mentioned heat storage containers 1 is horizontally spaced at the lower end with a filter screen 6 that allows heat-conducting fluid to permeate. The filter screen 6 is located above the fluid outlet 11, and the pore size of the filter screen 6 is smaller than the particle size of the solid heat storage particles 3, thereby isolating the solid heat storage particles 3 in each heat storage container 1 and preventing the solid heat storage particles 3 from escaping from each heat storage container 1.

[0040] Furthermore, each of the aforementioned heat storage containers 1 has a fluid outlet 11 at its bottom, and also includes a first conveying pipe 7 horizontally positioned below each heat storage container 1. The wall of the first conveying pipe 7 has a first guide port 71 corresponding to each of the aforementioned heat storage containers 1, and each first guide port 71 is fluidly connected to the fluid outlet 11 of its corresponding heat storage container 1. One end of the first conveying pipe 7 is closed, while the other end is fluidly connected to the input end of the pump tank 21. This design allows the heat-conducting fluid in each heat storage container 1 to flow smoothly back to the pump tank 21 of the fluid pump 2. Furthermore, it connects the bottoms of each heat storage container 1, which, in conjunction with the connecting ports 13 of each heat storage container 1, allows for better circulation of the heat-conducting fluid in each heat storage container 1, further improving the heat exchange effect of the heat-conducting fluid.

[0041] Furthermore, this embodiment also includes a second conveying pipe 8 and a third conveying pipe 9. The second conveying pipe 8 is horizontally positioned above each heat storage container 1, and has a second guide port 81 corresponding to each heat storage container 1. The fluid inlet 12 of each heat storage container 1 is located at its top and is fluidly connected to the corresponding second guide port 81. The second conveying pipe 8 also has a third guide port 82, which is fluidly connected to the output end of the electric heater 5. This achieves top-to-bottom connectivity between the heat storage containers 1, thereby achieving overall connectivity (top, middle, and bottom) between the heat storage containers 1, better promoting the three-dimensional circulation of heat-conducting fluid in each heat storage container 1, and maximizing the heat exchange effect of the heat-conducting fluid. One end of the third conveying pipe 9 is connected to the open end of the second conveying pipe 8, and the other end is connected to the input end of the pump tank 21, thereby enabling the heat-conducting fluid to flow back to the pump tank 21 more smoothly.

[0042] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts, collectively referred to as the first part and the second part, meaning that a fluid, gas, liquid, or a mixture of both can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first and second parts, or an indirect connection between the first and second parts through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A heat storage device, comprising a heat storage container (1) and a fluid pump (2) for conveying a heat-conducting fluid, characterized in that, The heat storage container (1) is tubular and closed at the top, and extends vertically. The interior of the heat storage container (1) is filled with solid heat storage particles (3) that have a density greater than that of the heat-conducting fluid and can exchange heat with it. These solid heat storage particles (3) can be isolated within the heat storage container (1). The heat storage container (1) has a fluid inlet (12) at its upper end and a fluid outlet (11) at its lower end. The pump tank (21) of the fluid pump (2) stores heat-conducting fluid, and the output end of the pump tank (21) is in fluid communication with the fluid inlet (12), while the input end is in fluid communication with the fluid outlet (11). It also includes a heat exchanger for exchanging heat with the above-mentioned heat-conducting fluid and solid heat storage particles (3) respectively. The heat exchanger includes a heat exchange tube (4) arranged in the heat storage container (1) along the length direction of the heat storage container (1). In operation, water flowing in from one end of the heat exchange tube (4) is heated into steam in the heat exchange tube (4) and flows out from the other end. Alternatively, steam flowing in from one end of the heat exchange tube (4) is condensed in the heat exchange tube (4) and flows out from the other end.

2. The heat storage device as described in claim 1, characterized in that, The heat exchange tube (4) is spiraled along the length of the heat storage container (1), and the radius of the heat exchange tube (4) matches the inner diameter of the heat storage container (1).

3. The heat storage device as described in claim 1 or 2, characterized in that, It also includes a flow deflector for changing the direction of the heat transfer fluid inside the heat storage container (1).

4. The heat storage device as described in claim 3, characterized in that, The flow guide includes a flow guide plate arranged laterally in the above-mentioned heat storage container (1).

5. The heat storage device as described in claim 1 or 2, characterized in that, It also includes an electric heater (5) for heating the heat-conducting fluid. The input end of the electric heater (5) is in fluid communication with the output end of the pump tank (21), and the output end of the electric heater (5) is in fluid communication with the fluid inlet (12).

6. The heat storage device as described in claim 1 or 2, characterized in that, The heat storage container (1) consists of at least two arranged side by side, and each heat storage container (1) has a communication port (13) on its side wall. The heat-conducting fluid in the adjacent heat storage containers (1) is connected to each other through the communication port (13).

7. The heat storage device as described in claim 6, characterized in that, The communication ports (13) of the adjacent heat storage containers (1) are positioned opposite each other and connected by a horizontally extending communication pipe (14).

8. The heat storage device as described in claim 7, characterized in that, Each of the heat storage containers (1) is divided into two layers: a fluid layer (1a) containing only heat-conducting fluid and a mixed layer (1b) located below the fluid layer (1a). The mixed layer (1b) contains both the solid heat storage particles (3) and the heat-conducting fluid. Each communication port (13) is opened at the side wall corresponding to the fluid layer (1a) of the heat storage container (1).

9. The heat storage device as described in claim 1 or 2, characterized in that, The lower end of the heat storage container (1) is horizontally provided with a filter screen (6) that allows heat-conducting fluid to permeate. The filter screen (6) is located above the fluid outlet (11), and the pore size of the filter screen (6) is smaller than the particle size of the solid heat storage particles (3).

10. The heat storage device as described in claim 6, characterized in that, Each of the heat storage containers (1) has a fluid outlet (11) at its bottom and also includes a first delivery pipe (7) arranged horizontally below each heat storage container (1). The first delivery pipe (7) has a first guide port (71) corresponding to each of the heat storage containers (1) on its wall. Each first guide port (71) is in fluid communication with the fluid outlet (11) of the corresponding heat storage container (1). One end of the first delivery pipe (7) is closed, while the other end is in fluid communication with the input end of the pump tank (21).

Images