High-temperature heat storage and exchange device

Abstract

The invention relates to a high-temperature heat storage and heat exchange device which comprises a heat storage container, a heat exchange device and a heat exchange device. The storage tank is used for storing heat-conducting fluid and is provided with a second fluid port for the heat-conducting fluid to circulate, and the second fluid port is in fluid communication with the first fluid port; the first fluid pump is used for at least driving the heat conduction fluid to enter the storage tank from the heat storage container through the first fluid opening and the second fluid opening, so that the liquid level of the heat conduction fluid in the heat storage container is changed; and a fluid channel for enabling the heat-conducting fluid in the storage box to flow back to the heat storage container is also arranged between the storage box and the heat storage container. Compared with the prior art, the liquid level of the heat conduction fluid in the heat storage container is changed by arranging the storage tank and the first fluid pump, so that the flowability of the heat conduction fluid in the heat storage container can be enhanced, and the heat exchange performance and the temperature field uniformity of the heat conduction fluid are improved.

Description

Technical Field

[0001] The invention relates to the field of heat storage and heat exchange of heat-conducting fluids, and in particular to a high-temperature heat storage and heat exchange device. Background Art

[0002] The dual tank system is a traditional high-temperature molten salt thermal storage system and is also the main technology currently used. However, the dual tank system currently has the following main problems: (1) Complex structure and operation: including complex system connections and ancillary facilities, which lead to troublesome installation and complicated operation; (2) High cost and short service life of the molten salt pump: a long-rod molten salt pump must be used, and its service life is only 1.5 years; (3) Troublesome operation and maintenance and low reliability: the molten salt cannot solidify in the tank during the service life, and many safeguards must be taken.

[0003] To this end, the Chinese invention patent with patent number ZL202210608538.5 (authorization announcement number CN114838611B) discloses a high-temperature heat exchange and heat storage unit, structure and device, and specifies the following contents: There are at least two high-temperature heat exchange and heat storage units in the high-temperature heat exchange and heat storage structure and they are stacked up and down, wherein the fluid outlet of the shell of any high-temperature heat exchange and heat storage unit is fluidly connected 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 each high-temperature heat exchange and heat storage unit are connected in sequence. Among them, 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 high-temperature heat transfer fluid to flow in, and the bottom wall is provided with a fluid outlet for the heat transfer fluid after heat exchange to flow out, and the shell is respectively provided with an overflow port, an overflow pipe for the heat transfer fluid to flow, and a heat exchange pipe for the fluid to be heated to pass through, 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 of the shell.

[0004] The modular system of the above patent simplifies the overall structure compared to the double tank system, and improves the overall safety and reliability. At the same time, it overcomes the problem that the double tank system needs to be produced, manufactured and installed on the project site, shortens the construction period and effectively improves the quality and reliability of the device. In addition, the use of solid heat storage particles and molten salt to store heat greatly reduces the use of molten salt (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 unit system is used for independent operation. In large-scale projects with dozens of units, the scope of the accident is limited to one unit, and the impact is limited (the double tank system often causes the entire system to shut down). In actual projects, the investment in equal capacity projects of modular systems is only 50-60% of that of double tank systems. The cost advantage is very obvious. The land area is only about 50% 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: the molten salt in the module can only flow in one direction through overflow driven by gravity, and the flow rate of the molten salt is limited, with an average flow rate of only 1 to 2 mm / s, which is not conducive to heat exchange. In addition, the temperature field in the module is uneven, and the solid thermal storage particles in some areas cannot fully exert their thermal storage capacity. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a high-temperature heat storage and heat exchange device with good heat exchange performance in view of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a high-temperature heat storage and heat exchange device with good heat exchange performance and good temperature field uniformity in view of the existing technology.

[0008] The technical solution adopted by the present invention to solve at least one of the above technical problems is: a high-temperature heat storage and heat exchange device, characterized in that it includes:

[0009] The heat storage container has a first fluid port for circulating a heat transfer fluid;

[0010] A storage tank, used for storing a heat transfer fluid, and having a second fluid port for the heat transfer fluid to flow, the second fluid port being in fluid communication with the first fluid port;

[0011] a first fluid pump, used for at least driving the heat transfer fluid from the above-mentioned thermal storage container through the first fluid port and the second fluid port into the storage tank, thereby causing the liquid level of the heat transfer fluid in the thermal storage container to change;

[0012] A fluid channel is also provided between the storage tank and the heat storage container for allowing the heat transfer fluid in the storage tank to flow back to the heat storage container.

[0013] Furthermore, a transfer box is included, through which the heat transfer fluid in the heat storage container flows into the storage tank, and at the same time, the heat transfer fluid in the storage tank flows into the heat storage container, and the first fluid pump is arranged in the transfer box. The transfer box can make the heat transfer fluid flow back and forth between the heat storage container and the storage tank better, and can increase the change rate of the heat transfer fluid capacity in the heat storage container, thereby further increasing the fluidity of the heat transfer fluid in the heat storage container, and then further improving the heat exchange performance of the heat transfer fluid.

[0014] Further, the transfer box is the first pump tank of the first fluid pump, and the first pump tank has a third fluid port and a fourth fluid port, wherein the third fluid port is in fluid communication with the first fluid port, and the fourth fluid port is in fluid communication with the second fluid port.

[0015] Furthermore, the first fluid pump has at least two states:

[0016] In the first state, the first fluid pump drives the heat transfer fluid from the storage tank through the first pump tank to flow into the heat storage container;

[0017] In the second state, the first fluid pump drives the heat transfer fluid from the heat storage container through the first pump tank into the storage tank. In this way, the first pump tank in the present invention plays multiple functions without the need for a separate transfer tank, thereby making the internal structure of the high-temperature heat storage and heat exchange device simple.

[0018] Furthermore, the amount of the heat transfer fluid in the storage tank changes repeatedly between filling and emptying, which can maximize the change rate of the heat transfer fluid capacity in the heat storage container and prevent the heat transfer fluid from solidifying in the storage tank, thereby ensuring the normal operation of the device.

[0019] Furthermore, the transfer box is the first pump tank of the first fluid pump, which has a third fluid port and a fourth fluid port, wherein the third fluid port is in fluid communication with the first fluid port, and the fourth fluid port is in fluid communication with the second fluid port; the storage tank is arranged at a position higher than the highest liquid level of the thermal storage container; the first fluid pump is used to drive the heat transfer fluid from the thermal storage container into the storage tank, and when the first fluid pump stops running, the heat transfer fluid will flow back to the thermal storage container under the action of gravity. This facilitates the control of the device and helps to ensure the reliability of the device operation.

[0020] Furthermore, it also includes a second fluid pump for conveying the heat-conducting fluid and an electric heater for heating the heat-conducting fluid, wherein the second pump tank of the second fluid pump has a fifth fluid port and a sixth fluid port, respectively, the electric heater has a fluid inlet and a fluid outlet, respectively, and the above-mentioned thermal storage container also has a seventh fluid port,

[0021] Furthermore, the fifth fluid port is in fluid communication with the first fluid port, the sixth fluid port is in fluid communication with the fluid inlet, and the fluid outlet is in fluid communication with the seventh fluid port, so that the second fluid pump can draw the heat transfer fluid out from the bottom of the heat storage container, and then flow into the heat storage container after being heated by the electric heater. In the electric heat storage working mode, the heat transfer fluid is heated by the electric heater to become a high-temperature heat transfer fluid, and then enters the heat storage container. The high-temperature heat transfer fluid heats the solid heat storage particles in the process of circulating downward, so that the temperature is increased, and the heat storage process is completed. Furthermore, it also includes a heat exchanger capable of heat exchange between the heat transfer fluid and the solid heat storage particles, the heat exchanger includes a heat exchange tube arranged in the heat storage container along the length direction of the heat storage container, and in the working state, the water flowing in from one end of the heat exchange tube is heated into steam in the heat exchange tube and then flows out from the other end, or the steam flowing in from one end of the heat exchange tube is condensed in the heat exchange tube and then flows out from the other end. By setting up a heat exchanger, on the one hand, it can avoid the solidification of the heat transfer fluid in the heat storage container in the working state, thereby eliminating the complex structure and complex operation in the prior art, improving the working reliability, and realizing the integration of heat storage and heat exchange, and after a long period of shutdown, only steam needs to be introduced into the heat exchange tube to make the entire device resume operation in a short time. In addition, the first fluid pump in the present invention can adopt a short-rod fluid pump (less than 2 meters), which can reduce the cost and extend the service life of the fluid pump compared with the existing long-rod fluid pump (more than 10 meters), thereby helping to extend the overall service life of the device.

[0022] Furthermore, the heat storage container is tubular and extends vertically, the top of the heat storage container is closed, and the first fluid port is opened at the bottom of the heat storage container. The heat storage container is filled with solid heat storage particles whose density is greater than that of the heat transfer fluid and can exchange heat with the heat transfer fluid, and the solid heat storage particles can be isolated in the heat storage container. In the present invention, the heat storage container is tubular and extends vertically, and the inner cavity of the heat storage container is a vertical through structure. Compared with the prior art, the actual average volume of the heat storage container is increased, while the unit volume of the floor space is reduced, and the solid heat storage particles can be filled after the main body of the device is installed, which can greatly reduce the amount of installation work and shorten the installation period. Furthermore, the structure of the heat storage container that is vertically through can make the solid heat storage particles and the heat transfer fluid in the working state tend to be layered up and down, and the temperature field tends to be high at the top and low at the bottom. In conjunction with the first fluid pump and the storage tank, it is conducive to realizing the up and down flow of the heat transfer fluid in the heat storage container, better improving the fluidity of the heat transfer fluid, thereby further improving the heat exchange efficiency of the heat transfer fluid.

[0023] Furthermore, the heat storage container further includes a flow guide for changing the flow direction of the heat transfer fluid inside the heat storage container. The flow guide can enhance the flow and diffusion of the heat transfer fluid, thereby improving the heat exchange capacity.

[0024] Furthermore, the thermal storage containers are at least two arranged side by side, and the adjacent thermal storage containers are provided with communication ports on the opposite side walls, and are connected through a communication pipe, so as to realize the circulation flow and heat exchange of the heat transfer fluid between the thermal storage containers, and the upward and downward flow heat exchange in each thermal storage container is combined, which is conducive to improving the heat exchange effect of the heat transfer fluid and facilitating the uniform distribution of the temperature field in each thermal storage container.

[0025] Furthermore, each of the thermal storage containers is divided into a fluid layer containing only a heat transfer fluid and a mixed layer located below the fluid layer, wherein the mixed layer contains both the solid heat storage particles and the heat transfer fluid, and each communication port is respectively opened at the side wall corresponding to the fluid layer of the thermal storage container. In this way, there is no need to set a filtering structure at each communication port, thereby avoiding the complication of the internal structure of each thermal storage container.

[0026] Compared with the prior art, the present invention has the advantages that: by providing a storage tank and a first fluid pump, wherein the first fluid pump is used to at least drive the heat transfer fluid from the above-mentioned heat storage container through the first fluid port and the second fluid port into the storage tank, thereby causing the heat transfer fluid level in the heat storage container to change, thereby being able to enhance the fluidity of the heat transfer fluid in the heat storage container, and improve the heat exchange performance and temperature field uniformity of the heat transfer fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a high-temperature heat storage and heat exchange device in Example 1 of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a high-temperature heat storage and heat exchange device in Example 2 of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the heat exchange tube in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] Embodiment 1:

[0033] like Figure 1 and Figure 3 As shown, a high-temperature heat storage and heat exchange device includes a heat storage container 1, a storage tank 2 and a first fluid pump 3. The heat storage container 1 has a first fluid port 11 for circulation of a heat-conducting fluid. The storage tank 2 is used to store the heat-conducting fluid, and has a second fluid port 21 for circulation of the heat-conducting fluid, and the second fluid port 21 is fluidically connected with the first fluid port 11. The first fluid pump 3 is used to at least drive the heat-conducting fluid from the heat storage container 1 into the storage tank 2 through the first fluid port 11 and the second fluid port 21, thereby causing the liquid level of the heat-conducting fluid in the heat storage container 1 to change. In addition, there is a fluid channel between the storage tank 2 and the heat storage container 1 for allowing the heat-conducting fluid in the storage tank 2 to flow back to the heat storage container 1. In this embodiment, the fluid channel specifically includes the following first pump tank, a connecting pipeline between the first pump tank and the storage tank 2, and a connecting pipeline between the first pump tank and the heat storage container, such as Figure 1 shown.

[0034] As can be seen from the above, in the present invention, the storage tank 2 and the first fluid pump 3 are provided, wherein the first fluid pump 3 is used to at least drive the heat transfer fluid from the above-mentioned heat storage container 1 through the above-mentioned first fluid port 11 and the above-mentioned second fluid port 21 into the above-mentioned storage tank 2, thereby causing the liquid level of the heat transfer fluid in the heat storage container 1 to change, thereby enhancing the fluidity of the heat transfer fluid in the heat storage container 1, and improving the heat exchange performance and temperature field uniformity of the heat transfer fluid.

[0035] Furthermore, a transfer box 31 is included, through which the heat transfer fluid in the heat storage container 1 flows into the storage tank 2, and at the same time, the heat transfer fluid in the storage tank 2 flows into the heat storage container 1 through the transfer box 31, and the first fluid pump 3 is arranged in the transfer box 1. The transfer box 31 can, on the one hand, make the heat transfer fluid flow back and forth between the heat storage container 1 and the storage tank 2 better, and on the other hand, can increase the change rate of the heat transfer fluid capacity in the heat storage container 1, thereby further increasing the fluidity of the heat transfer fluid in the heat storage container 1, and then further improving the heat exchange performance of the heat transfer fluid.

[0036] In this embodiment, the transfer box 31 is preferably the first pump tank of the first fluid pump 3, and the first pump tank has a third fluid port 311 and a fourth fluid port 312, wherein the third fluid port 311 is in fluid communication with the first fluid port 11, and the fourth fluid port 312 is in fluid communication with the second fluid port 21. In addition, the first fluid pump 3 has at least two states:

[0037] In the first state, the first fluid pump 3 drives the heat transfer fluid from the storage tank 2 to flow into the heat storage container 1 through the transfer tank 31;

[0038] In the second state, the first fluid pump 3 drives the heat transfer fluid from the heat storage container 1 to flow into the storage tank 2 through the transfer tank 31. In this way, the first pump tank in the present invention has multiple functions, and there is no need to set up a transfer tank 31, so that the internal structure of the high-temperature heat storage and heat exchange device can be simple.

[0039] Further preferably, the storage amount of the heat transfer fluid in the storage tank 2 changes repeatedly between filling and emptying. On the one hand, the change rate of the heat transfer fluid capacity in the heat storage container 1 can be increased to the greatest extent, and on the other hand, the heat transfer fluid can be prevented from solidifying in the storage tank 2, which is conducive to ensuring the reliability of the operation of the device.

[0040] Furthermore, the first fluid pump 3 is used to drive the heat transfer fluid from the heat storage container 1 into the storage tank 2, and when the first fluid pump 3 stops running, the heat transfer fluid will flow back to the heat storage container 1 under the action of gravity. This facilitates the control of the device and helps to ensure the reliability of the device operation.

[0041] The heat storage container 1 can be implemented in a variety of specific ways. In the present embodiment, preferably, the heat storage container 1 is tubular and extends vertically, and the top of the heat storage container 1 is closed, the first fluid port 11 is opened at the bottom of the heat storage container 1, and the heat storage container 1 is filled with solid heat storage particles 13 having a density greater than that of the heat transfer fluid and capable of heat exchange with the heat transfer fluid, and the solid heat storage particles 13 can be isolated in the heat storage container 1.

[0042] Furthermore, it also includes a heat exchanger for respectively exchanging heat with the heat-conducting fluid and the solid heat-storage particles 13, and the heat exchanger includes a heat exchange tube 6 arranged in the heat storage container 1 along the length direction of the heat storage container 1, and in the working state, the water flowing in from the lower end of the heat exchange tube 6 is heated into steam in the heat exchange tube 6 and then flows out from the upper end, or the steam flowing in from the upper end of the heat exchange tube 6 is condensed in the heat exchange tube 6 and then flows out from the lower end. In this embodiment, during the steam heat storage process, the heat exchanger also includes a first fluid tube 61 and a second fluid tube 62 arranged outside the heat storage container 1, wherein the first fluid tube 61 is connected to one end of the heat exchange tube 6, and the second fluid tube 62 is connected to the other end of the heat exchange tube 6.

[0043] In this embodiment, a filter screen 9 through which the heat transfer fluid can penetrate is horizontally disposed at the lower end of the heat storage container 1. The filter screen 9 is located above the first fluid port 11, and the pore size of the filter screen 9 is smaller than the particle size of the solid heat storage particles 13, so that the solid heat storage particles 13 can be isolated in each heat storage container 1 to prevent the solid heat storage particles 13 from escaping from each heat storage container 1.

[0044] As can be seen from the above, the heat storage container 1 is tubular and extends vertically, and the inner cavity of the heat storage container 1 is a vertically through structure. Compared with the prior art, the actual average volume of the heat storage container 1 is increased, while the unit volume footprint is reduced, and the solid heat storage particles 13 can be filled after the main body of the device is installed, which can greatly reduce the amount of installation work and shorten the installation period. The height of the heat storage container 1 in the present invention can reach 15 meters. Furthermore, the vertically through structure of the heat storage container 1 can make the solid heat storage particles 13 and the heat transfer fluid in it tend to be layered up and down in the working state, and the temperature field tends to be high at the top and low at the bottom. In conjunction with the first fluid pump 3 and the storage tank 2, it is conducive to realizing the top-down flow of the heat transfer fluid in the heat storage container 1, and better improve the fluidity of the heat transfer fluid, thereby further improving the heat exchange efficiency of the heat transfer fluid.

[0045] Furthermore, by setting up a heat exchanger, on the one hand, it is possible to prevent the heat transfer fluid in the heat storage container 1 from solidifying during operation, thereby eliminating the complex structure and complex control in the prior art, improving the working reliability, and realizing the integration of heat storage and heat exchange. After a long period of shutdown, the entire device can be restored to operation in a short time by simply passing steam into the heat exchange pipe 6. In addition, the first fluid pump 3 in this embodiment can adopt a short-rod fluid pump (less than 2 meters), which can reduce costs and extend the service life of the first fluid pump 3 compared with the existing long-rod fluid pump (more than 10 meters), thereby helping to extend the overall service life of the device.

[0046] In the present invention, the heat transfer fluid is at least one of molten salt or heat transfer oil. Molten salt and heat transfer oil can fill the gaps between the solid heat storage particles 13, greatly reduce thermal resistance, significantly increase the heat exchange area, achieve efficient heat exchange, and greatly reduce the heat exchange temperature difference. In this embodiment, the heat transfer fluid is preferably liquid molten salt. The solid heat storage particles 13 are at least one of forsterite or quartz, so that good heat exchange and heat storage effects can be obtained. In addition, the combination of molten salt and solid heat storage particles 13 greatly reduces the cost compared with the traditional pure molten salt method (the proportional cost of solid heat storage particles 13 is only 1 / 8 of that of molten salt). Among them, molten salt is mainly used as a heat exchange medium, while solid heat storage particles 13 are mainly used as a heat storage medium.

[0047] Furthermore, it also includes a deflector (not shown) for changing the flow direction of the heat transfer fluid inside the heat storage container 1. The deflector can enhance the flow and diffusion of the heat transfer fluid, thereby improving the heat exchange capacity. Preferably, the deflector includes a deflector plate arranged in the solid heat storage particles 13 in the above-mentioned heat storage container 1 along the horizontal direction, so as to guide the radial flow of the heat transfer fluid in the solid heat storage particles 13, thereby improving the radial temperature difference caused by the uneven vertical flow process of the heat transfer fluid, optimizing the cross-sectional temperature field, and further improving the heat storage effect. Further preferably, the above-mentioned deflectors are arranged at intervals in the vertical direction along the central axis of the heat exchange tube 6, and each deflector includes at least two of the above-mentioned deflectors arranged at intervals along the circumferential direction.

[0048] Furthermore, the above-mentioned heat storage containers 1 are at least two arranged side by side, and the opposite side walls of the adjacent heat storage containers 1 are respectively provided with communication ports 14, and are connected through a horizontally extending communication pipe 15. Thus, the circulation flow heat exchange of the heat transfer fluid between the heat storage containers 1 is realized, and the upward and downward flow heat exchange in each heat storage container 1 is combined to improve the heat exchange effect of the heat transfer fluid and facilitate the uniform distribution of the temperature field in each heat storage container 1. At the same time, the above-mentioned heat exchange tubes 6 correspond to the above-mentioned heat storage containers 1 one by one, and one end of each heat exchange tube 6 is respectively connected to the above-mentioned first fluid pipe 61, and the other end is connected to the above-mentioned second fluid pipe 61.

[0049] Preferably, each of the above-mentioned thermal storage containers 1 is divided into upper and lower layers into a fluid layer 1a containing only a heat transfer fluid and a mixed layer 1b located below the fluid layer 1a, wherein the mixed layer 1b contains both the above-mentioned solid heat storage particles 13 and the heat transfer fluid, and each of the communication ports 14 is respectively opened at the side wall corresponding to the fluid layer 1a of the thermal storage container 1. In this way, there is no need to set a filtering structure at each of the communication ports 14, thereby avoiding the complication of the internal structure of each thermal storage container 1.

[0050] Further, in this embodiment, the first fluid port 11 is respectively arranged at the bottom of each thermal storage container 1, and further comprises a first delivery pipe 7, which is arranged below each thermal storage container 1 in the horizontal direction, and a first flow guide port 71 corresponding to the thermal storage container 1 is opened on the pipe wall of the first delivery pipe 7, and each first flow guide port 71 is respectively fluidly connected with the fluid outlet 52 of the corresponding thermal storage container 1, and one end of the first delivery pipe 7 is closed, and the other end is fluidly connected with the input end of the first pump tank.

[0051] Embodiment 2:

[0052] like Figure 2 As shown, different from the embodiment 1, in this embodiment, a second fluid pump 4 for conveying a heat-conducting fluid and an electric heater 5 for heating the heat-conducting fluid are further included. Among them, the second pump tank 41 of the second fluid pump 4 has a fifth fluid port 411 and a sixth fluid port 412, respectively, the electric heater 5 has a fluid inlet 51 and a fluid outlet 52, respectively, and each thermal storage container 1 also has a seventh fluid port 12. In addition, the fifth fluid port 411 is in fluid communication with the first fluid port 11, the sixth fluid port 412 is in fluid communication with the fluid inlet 51, and the fluid outlet 52 is in fluid communication with each of the seventh fluid ports 12, respectively, so that the second fluid pump 4 can draw the heat-conducting fluid out from the bottom of the thermal storage container 1, and then flow into the thermal storage container 1 after being heated by the electric heater 5. The heat transfer fluid is heated by the electric heater 5. During the electric heat storage process, the heat transfer fluid is heated by the electric heater 5 to become a high-temperature heat transfer fluid, and then enters the heat storage container 1. The high-temperature heat transfer fluid heats the solid heat storage particles 13 during the downward circulation process, so that the temperature is increased, and the heat storage process is completed. Similarly, due to the setting of the above-mentioned heat exchanger, the second fluid pump 4 in this embodiment also adopts a short-rod pump. Furthermore, it also includes a third delivery pipe 10, one end of which is connected to the open end of the above-mentioned first delivery pipe 7, and the other end is connected to the above-mentioned fifth fluid port 411, and a fourth guide port 101 is opened on the third delivery pipe 10, and the fourth guide port 101 is connected to the above-mentioned third fluid port 311 through the fourth delivery pipe 100.

[0053] Further, in the present embodiment, each seventh fluid port 12 is respectively arranged at the top of each heat storage container 1, and further comprises a second delivery pipe 8, which is horizontally arranged above each heat storage container 1, and the second delivery pipe 8 is provided with second flow guide ports 81 corresponding to each heat storage container 1 one by one, and the seventh fluid port 12 of each heat storage container 1 is respectively fluidly connected with the corresponding second flow guide port 81, and the second delivery pipe 8 is further provided with a third flow guide port 82, and the third flow guide port 82 is fluidly connected with the output end of the electric heater 5.

[0054] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two components or parts, which are collectively referred to as the first part and the second part below, that is, fluid gas, liquid or a mixture of the two can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected to each other, or the first part and the second part can be indirectly connected through at least one third party, and the third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A high-temperature heat storage and heat exchange device, characterized in that: include: A heat storage container (1) having a first fluid port (11) for circulating a heat-conducting fluid; A storage tank (2) for storing a heat-conducting fluid and having a second fluid port (21) for the heat-conducting fluid to flow through, wherein the second fluid port (21) is in fluid communication with the first fluid port (11); a first fluid pump (3) for at least driving the heat transfer fluid from the heat storage container (1) through the first fluid port (11) and the second fluid port (21) into the storage tank (2), thereby causing a change in the liquid level of the heat transfer fluid in the heat storage container (1); Furthermore, a fluid channel is provided between the storage tank (2) and the heat storage container (1) to allow the heat transfer fluid in the storage tank (2) to flow back to the heat storage container (1).

2. The high temperature heat storage and heat exchange device according to claim 1, characterized in that: The invention also comprises a transfer box (31), through which the heat transfer fluid in the heat storage container (1) flows into the storage tank (2), and at the same time, the heat transfer fluid in the storage tank (2) flows into the heat storage container (1) through the transfer box (31), and the first fluid pump (3) is arranged in the transfer box (31).

3. The high temperature heat storage and heat exchange device according to claim 2, characterized in that: The transfer box (31) is the first pump tank of the first fluid pump (3), and the first pump tank has a third fluid port (311) and a fourth fluid port (312), wherein the third fluid port (311) is in fluid communication with the first fluid port (11), and the fourth fluid port (312) is in fluid communication with the second fluid port (21). Furthermore, the first fluid pump (3) has at least two states: In the first state, the first fluid pump (3) drives the heat transfer fluid from the storage tank (2) through the transfer tank (31) to flow into the heat storage container (1); In the second state, the first fluid pump (3) drives the heat transfer fluid from the heat storage container (1) through the transfer tank (31) to flow into the storage tank (2).

4. The high temperature heat storage and heat exchange device according to claim 1, characterized in that: The storage amount of the heat transfer fluid in the storage tank (2) changes repeatedly between being filled and being emptied.

5. The high temperature heat storage and heat exchange device according to claim 2, characterized in that: The transfer box (31) is the first pump tank of the first fluid pump (3), and the first pump tank has a third fluid port (311) and a fourth fluid port (312), wherein the third fluid port (311) is in fluid communication with the first fluid port (11), and the fourth fluid port (312) is in fluid communication with the second fluid port (21); The storage tank (2) is arranged at a position higher than the highest liquid level of the heat storage container (1); The first fluid pump (3) is used to drive the heat transfer fluid from the above-mentioned heat storage container (1) into the storage tank (2), and when the first fluid pump (3) stops running, the heat transfer fluid will flow back to the heat storage container (1) under the action of gravity.

6. The high temperature heat storage and heat exchange device according to any one of claims 1 to 5, characterized in that: The heat storage container (1) further comprises a second fluid pump (4) for conveying a heat-conducting fluid and an electric heater (5) for heating the heat-conducting fluid, wherein the second pump tank (41) of the second fluid pump (4) has a fifth fluid port (411) and a sixth fluid port (412), respectively, the electric heater (5) has a fluid inlet (51) and a fluid outlet (52), and the heat storage container (1) further has a seventh fluid port (12). Furthermore, the fifth fluid port (411) is in fluid communication with the first fluid port (11), the sixth fluid port (412) is in fluid communication with the fluid inlet (51), and the fluid outlet (52) is in fluid communication with the seventh fluid port (12), so that the second fluid pump (4) can draw the heat transfer fluid out from the bottom of the heat storage container (1), heat it with the electric heater (5), and then flow it into the heat storage container (1).

7. The high temperature heat storage and heat exchange device according to any one of claims 1 to 5, characterized in that: It also includes a heat exchanger for exchanging heat with a heat-conducting fluid, the heat exchanger including a heat exchange tube (6) arranged in the heat storage container (1) along the length direction of the heat storage container (1), and in a working state, water flowing in from one end of the heat exchange tube (6) is heated in the heat exchange tube (6) to become steam and then flows out from the other end, or steam flowing in from one end of the heat exchange tube (6) is condensed in the heat exchange tube (6) and then flows out from the other end.

8. The high temperature heat storage and heat exchange device according to any one of claims 1 to 5, characterized in that: The heat storage container (1) is tubular and extends vertically. The top of the heat storage container (1) is closed, and the first fluid port (11) is opened at the bottom of the heat storage container (1). The heat storage container (1) is filled with solid heat storage particles (13) having a density greater than that of a heat transfer fluid and capable of heat exchange with the heat transfer fluid, and the solid heat storage particles (13) can be isolated in the heat storage container (1).

9. The high temperature heat storage and heat exchange device according to claim 8, characterized in that: The heat storage containers (1) are at least two arranged side by side, and communication ports (14) are respectively provided on opposite side walls of adjacent heat storage containers (1), and are connected via a communication pipe (15).

10. The high temperature heat storage and heat exchange device according to claim 9, characterized in that: The interior of each of the heat storage containers (1) is divided into upper and lower layers into a fluid layer (1a) containing only a heat-conducting fluid and a mixed layer (1b) located below the fluid layer (1a), wherein the mixed layer (1b) contains both the solid heat storage particles (13) and the heat-conducting fluid, and each of the communication ports (14) is respectively opened at a side wall corresponding to the fluid layer (1a) of the heat storage container (1).

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