Rock heat storage system

Abstract

The utility model relates to the field of heat storage equipment, and provides a rock heat storage system which comprises a heat storage device filled with rock grains and provided with an inlet and an outlet, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline which are arranged outside the heat storage device, a fan arranged on the second pipeline, and an outer heater arranged on the third pipeline, the outlet, the first pipeline, the second pipeline, the third pipeline and the inlet are sequentially communicated to form a heat charging path; and the fifth pipeline is provided with a heat exchanger and an outlet, the fifth pipeline, the second pipeline, the fourth pipeline and the inlet are sequentially communicated to form a first heat release path, and / or an air inlet and an air outlet are formed, and the air inlet, the fan, the fourth pipeline, the inlet, the outlet and the air outlet are sequentially communicated to form a second heat release path. The fan drives air to charge or discharge heat, so that the heat charge and discharge efficiency can be improved. The outer heater is arranged outside the heat storage device, so that the heat storage device and the outer heater are flexibly arranged. The heat release path avoids the outer heater, so that resistance and heat loss can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of thermal storage equipment, and in particular to a rock thermal storage system. Background Technology

[0002] Thermal storage equipment typically uses off-peak electricity or waste electricity to convert electrical energy into thermal energy for storage. The stored thermal energy is then released when needed to improve energy efficiency.

[0003] Existing thermal storage equipment suffers from problems such as slow heat storage and release, and uneven heat distribution, resulting in poor utilization efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect of poor utilization effect of existing thermal storage equipment and provide a rock thermal storage system.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A rock thermal storage system comprising:

[0007] The heat storage device has an internal filling cavity filled with rock particles. The pores between the rock particles form air channels. The heat storage device has an inlet and an outlet that are connected through the air channels.

[0008] A piping unit, located outside the heat storage tank, includes a first pipe, a second pipe, a third pipe, and a fourth pipe;

[0009] The fan is installed on the second pipeline;

[0010] An external heater is installed on the third pipeline;

[0011] The outlet, the first pipeline, the second pipeline, the third pipeline, and the inlet are connected in sequence to form a heat charging path;

[0012] The fifth pipeline is equipped with a heat exchanger for heating the liquid. The outlet, the fifth pipeline, the second pipeline, the fourth pipeline, and the inlet are sequentially connected to form a first heat release path; and / or, the rock thermal storage system is further equipped with an air inlet and an air outlet. The air inlet, the fan, the fourth pipeline, the inlet, the outlet, and the air outlet are sequentially connected to form a second heat release path.

[0013] In this scheme, by setting up a fan to drive airflow for heat charging and releasing, the heat charging and releasing efficiency can be improved. By placing the fan and external heater outside the heat storage tank, the arrangement flexibility of these three components can be improved. By setting up a fourth pipeline to form a first heat release path and a second heat release path, avoiding the external heater, airflow resistance and heat loss during heat release can be reduced, thereby improving heat release efficiency.

[0014] Preferably, the piping unit further includes a sixth piping, and the third piping and the fourth piping are both connected to the inlet through the sixth piping.

[0015] Preferably, the piping unit further includes a seventh piping, through which the first piping and the fifth piping are connected to the outlet.

[0016] Preferably, the rock thermal storage system further includes a control valve unit, the control valve unit comprising:

[0017] Valve 1 and Valve 2 are respectively installed at both ends of the first pipeline;

[0018] Valve three and valve four are respectively installed at both ends of the third pipeline;

[0019] Valve five and valve six are respectively installed at both ends of the fourth pipeline;

[0020] Valves 7 and 8 are respectively installed at both ends of the fifth pipeline, and / or valves 9 and 10 are respectively installed at the air inlet and the air outlet.

[0021] Preferably, the air inlet and the fifth pipeline are connected at a first connection point on the fifth pipeline, and the first connection point is located at one end of the heat exchanger facing the second pipeline along the first heat dissipation path.

[0022] Preferably, the rock thermal storage system further includes a control valve unit, which includes valve eight and valve nine. The air inlet is connected to the fifth pipeline through valve nine. Valve eight is located at one end of the fifth pipeline connected to the second pipeline. The heat exchanger, the first connection point, and valve eight are arranged sequentially along the first heat release path.

[0023] Preferably, the air outlet and the fifth pipeline are connected at a second connection point on the fifth pipeline, and the second connection point is located at the end of the heat exchanger facing the outlet along the first heat release path.

[0024] Preferably, the rock thermal storage system further includes a control valve unit, which includes valve seven, valve ten, and valve eleven. The air outlet is connected to the fifth pipeline through valve ten. Valve seven, the second connection point, valve eleven, and the heat exchanger are sequentially arranged on the fifth pipeline. Valve seven is located at the end of the fifth pipeline that is connected to the outlet.

[0025] Preferably, the inlet is located at the bottom of the thermal storage tank, and the outlet is located at the top of the thermal storage tank.

[0026] Preferably, the rock thermal storage system further includes a mounting bracket, on which the thermal storage device is mounted, with the bottom of the thermal storage device being higher than the bottom of the mounting bracket.

[0027] Preferably, the rock thermal storage system further includes an air inlet baffle and an air outlet baffle, which are spaced apart within the cavity of the thermal storage unit, dividing the cavity inside the thermal storage unit into:

[0028] The air inlet cavity is connected to the inlet.

[0029] The filling cavity is located between the air inlet baffle and the air outlet baffle;

[0030] The air outlet cavity is connected to the outlet.

[0031] The air inlet baffle and the air outlet baffle are provided with multiple openings at even intervals to connect the air inlet cavity, the filling cavity and the air outlet cavity in sequence. The cross-sectional dimensions of the air inlet cavity and the air outlet cavity gradually increase in the direction close to the filling cavity.

[0032] Preferably, the heat storage device is provided with a feed inlet communicating with the outside of the heat storage device and the filling cavity, and a baffle for closing the feed inlet, wherein the feed inlet is located at the top of the filling cavity along the height direction of the heat storage device.

[0033] Preferably, the heat storage device is provided with a sampling port and a cover plate. The sampling port is used to connect the outside of the heat storage device and the filling cavity, and the cover plate is used to close the sampling port.

[0034] The positive and progressive effects of this utility model are as follows:

[0035] By installing a fan to drive airflow for heat charging and discharging, the efficiency of heat charging and discharging can be improved. Placing the fan and external heater outside the heat storage tank increases the flexibility of their arrangement. By installing a fourth pipeline to form a first heat dissipation path and a second heat dissipation path, bypassing the external heater, airflow resistance and heat loss during heat dissipation can be reduced, thus improving heat dissipation efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a thermal storage system;

[0037] Figure 2 A schematic diagram of a thermal storage device mounted on a mounting bracket;

[0038] Figure 3 This is a schematic diagram of the interior of the thermal storage device.

[0039] Explanation of reference numerals in the attached figures:

[0040] Thermal storage system 100;

[0041] 1. Heat storage tank, 11. Inlet, 12. Outlet, 13. Cover plate, 14. Auxiliary opening, 15. Air inlet baffle, 16. Air outlet baffle, 17. Air inlet cavity, 18. Filling cavity, 19. Air outlet cavity;

[0042] Fan 2;

[0043] External heater 3, internal heater 4;

[0044] Heat exchanger 5;

[0045] Air inlet 61, air outlet 62;

[0046] Pipeline 71, Pipeline 72, Pipeline 73, Pipeline 74, Pipeline 75, Pipeline 76, Pipeline 77, Pipeline 78, Pipeline 79;

[0047] Valve 1 (81), Valve 2 (82), Valve 3 (83), Valve 4 (84), Valve 5 (85), Valve 6 (86), Valve 7 (87), Valve 8 (88), Valve 9 (89), Valve 10 (90), Valve 11 (91);

[0048] Mounting bracket 110. Detailed Implementation

[0049] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0050] This embodiment provides a rock thermal storage system (rock thermal storage system is referred to as thermal storage system). Figures 1-3 This is a schematic diagram provided for this embodiment.

[0051] like Figure 1 The thermal storage system 100 includes:

[0052] The heat storage device 1 has a filling cavity 18 inside for filling rock particles (rock particles are referred to as rocks). The rock particles are used as a heat storage medium to store heat energy. The pores between the rock particles form air channels. The heat storage device 1 has an inlet 11 and an outlet 12. The inlet 11, the air channels, and the outlet 12 are connected in sequence.

[0053] The piping unit includes a first pipe 71, a second pipe 72, a third pipe 73, a fourth pipe 74, and a fifth pipe 75. The piping unit is located outside the heat storage tank 1.

[0054] Fan 2, installed on the second pipe 72, is used to drive airflow;

[0055] An external heater 3 is installed on the third pipe 73 and is used to heat the air;

[0056] Heat exchanger 5 is installed on the fifth pipe 75 and is used to exchange heat with water;

[0057] Air inlet 61 and air outlet 62.

[0058] The outlet 12, the first pipe 71, the second pipe 72, the third pipe 73, and the inlet 11 are sequentially connected to form a heat charging path. When heat storage is required, the fan 2 drives the air to flow along the heat charging path. The air flows to the third pipe 73 and is heated by the external heater 3 on the third pipe 73. Then, it flows into the heat storage tank 1 from the inlet 11 to exchange heat with the rock particles, causing the temperature of the rock particles to rise and store heat energy. The temperature of the air after exchanging heat with the rock particles decreases, and it flows out from the outlet 12 and then flows through the first pipe 71 and the second pipe 72 back to the external heater 3 on the third pipe 73 for heating. The cycle continues, transferring the heat from the external heater 3 to the heat storage chamber and releasing it to the rocks for storage.

[0059] The outlet 12, the fifth pipe 75, the second pipe 72, the fourth pipe 74, and the inlet 11 are connected in sequence to form the first heat release path. When heat needs to be released to the heat exchanger 5, the fan 2 drives the air to flow in the first heat release path. The air enters the heat storage tank 1 and flows through the pores formed between the high-temperature rock particles to carry away the heat. Then, it flows through the outlet 12 to the fifth pipe 75 to exchange heat and release heat at the heat exchanger 5. After releasing the heat, the air enters the heat storage tank 1 again through the second pipe 72, the fourth pipe 74, and the inlet 11 in sequence to carry away the heat from the rock. The cycle continues to transfer the heat from the rock to the heat exchanger 5 for release.

[0060] The air inlet 61, fan 2, fourth pipe 74, inlet 11, outlet 12, and air outlet 62 are connected in sequence to form the second heat release path. When heat release is required to generate hot air, fan 2 drives the air flow in the second heat release path. The cold air at air inlet 61 enters the heat storage tank 1 through fan 2, fourth pipe 74, and inlet 11 and exchanges heat with the rock to form hot air. The hot air flows out from air outlet 62 through outlet 12 for use.

[0061] Figure 1 Arrows or short straight lines with arrows are marked on the pipeline to indicate the direction of airflow, as well as the direction of fluid flow at heat exchanger 5.

[0062] By installing a fan 2 to drive airflow for heat charging and discharging, the heat charging and discharging efficiency can be improved. By placing the fan 2 and the external heater 3 outside the heat storage tank 1, the flexibility of their arrangement can be increased. By installing a fourth pipe 74 to form a first heat dissipation path and a second heat dissipation path, avoiding the external heater 3, the airflow resistance and heat loss during heat dissipation can be reduced, thereby improving the heat dissipation efficiency.

[0063] High-temperature thermal cycling resistant natural rocks can be selected through testing and evaluation. Compared to other thermal storage materials, this method reduces processing and manufacturing steps, lowers costs, and is more environmentally friendly. The high-temperature resistance of the rocks also enhances safety. The natural rocks have irregular shapes and are naturally stacked within the filling cavity 18. The gaps between the rocks naturally form pores for air circulation, eliminating the need for specially designed air passages within the filling cavity 18, thus simplifying the structure. Rocks with a size of 2 cm or larger are preferred.

[0064] The heat energy of the external heater 3 can come from off-peak electricity, waste electricity, peak-shaving and frequency-modulating electricity, solar and wind power generation, etc. The external heater 3 converts electrical energy into heat energy; or the external heater 3 can be modified into a waste heat heater, which uses high-temperature waste heat to heat the air and then transfers the heat to the rock for storage.

[0065] Heat exchanger 5 is used for heat exchange with water. In the first heat dissipation path, high-temperature air flows to heat exchanger 5 to heat the water there to form hot water, or heats the water to generate hot steam or saturated steam for use. In other embodiments, heat exchanger 5 can exchange heat with liquid media such as water and heat transfer oil for user use.

[0066] like Figure 1 The piping unit also includes a sixth pipe 76 and a seventh pipe 77. The inlet 11 is connected to the third pipe 73 and the fourth pipe 74 through the sixth pipe 76, and the outlet 12 is connected to the first pipe 71 and the fifth pipe 75 through the seventh pipe 77. This arrangement can improve the flexibility of the layout of each part of the thermal storage system 100 and reduce the relative position requirements.

[0067] like Figure 1 The thermal storage system 100 includes a control valve unit comprising valves 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, and 91. An external heater 3 is located on the third pipe 73 between valves 83 and 84. A heat exchanger 5 is located on the fourth pipe 74 between valves 87 and 88. The control valves can be on / off valves or regulating valves with both on / off and flow regulation functions.

[0068] like Figure 1The first pipe 71 has valves 81 and 82 installed at both ends; the third pipe 73 has valves 83 and 84 installed at both ends; the fourth pipe 74 has valves 85 and 86 installed at both ends; and the fifth pipe 75 has valves 87 and 88 installed at both ends. When using the heat charging path to store heat through rock, valves 81, 82, 83, and 84 are opened, and valves 85, 86, 87, and 88 are closed. When using heat release path one or two, valves 81, 82, 83, and 84 are closed, and valves 85, 86, 87, and 88 are opened. This arrangement allows unused pipes to be closed during heat charging and releasing, preventing air from entering unused pipes and trapping heat, thereby improving heat exchange efficiency. The orientation description of the structures in the control valve unit and pipe unit can be understood as their orientation along the airflow path.

[0069] Air inlet 61 is connected to valve 89 and fifth pipe 75. For example... Figure 1 The heat storage system 100 also includes an eighth pipe 78, with an air inlet 61 and a valve 89 disposed on the eighth pipe 78. The eighth pipe 78 connects to the first connection point of the fifth pipe 75, namely point P1. Point P1 is located along the fifth pipe 75 between the heat exchanger 5 and the valve 88. This arrangement allows the second heat release path to utilize the valve 88 on the fifth pipe 75. When not in use, the valve 88 can be closed to prevent air from entering and trapping heat. Simultaneously, by providing the valve 89, when the first heat release path is operating, the valve 89 can be closed to prevent the air inlet 61 from interfering with the heat exchanger 5. The valve 89 can be located on the eighth pipe 78 near point P1 or near the air inlet 61.

[0070] Air outlet 62 and fifth pipe 75 are connected via valve 90. For example... Figure 1 The heat storage system 100 also includes a ninth pipe 79, with an air outlet 62 and a valve 11 90 installed on the ninth pipe 79. The ninth pipe 79 connects to the second connection point of the fifth pipe 75, namely point P2. A valve 7 87, point P2, a valve 11 91, and the heat exchanger 5 are sequentially arranged along the fifth pipe 75. This arrangement allows the second heat release path to utilize valve 7 87 on the fifth pipe 75, closing valve 7 87 when not in use to prevent air from entering and trapping heat. By installing valve 11 90, when the first heat release path is operating, closing valve 11 90 prevents the air outlet 62 from interfering with the heat exchanger 5. By installing valve 11 91, when the second heat release path is operating, closing valve 11 91 prevents the heat exchanger 5 from interfering with the hot air flowing out of the air outlet 62. Valve 11 90 can be installed on the ninth pipe 79 near point P2 or near the air outlet 62.

[0071] In this embodiment, the air inlet 61 and air outlet 62 are connected to the fifth pipe 75, so that the air inlet 61, air outlet 62, and heat exchanger 5 are all located close to the user's position. In other embodiments, the eighth pipe 78 and / or the ninth pipe 79 may not be provided. For example, a valve may be provided on the seventh pipe 77, the first pipe 71, or the second pipe 72, and the valve's connection port may be used as the air inlet 61 or the air outlet 62. In other embodiments, only the heat exchanger 5 may be provided, or only the air inlet 61 and the air outlet 62 may be provided, to form a heat dissipation path.

[0072] In this invention, the heat release power can be adjusted by means such as adjusting the frequency of the fan 2, for example, by using a variable frequency fan 2, and adjusting the wind speed. The parameters of the hot water or steam output from the heat exchanger 5 can be adjusted by regulating the fluid flow rate and velocity at the heat exchanger 5.

[0073] The heat storage unit 1 can be configured as a cylinder or a cuboid, etc. For example... Figure 1 Along the height direction H of the heat storage tank 1, the inlet 11 is located at the bottom of the heat storage tank 1, and the outlet 12 is located at the top of the heat storage tank 1. When the heat storage tank 1 is charged, the hot air flows from bottom to top. When the charging ends, the temperature of the lower rock is higher than that of the upper rock. When valves 1-81, 4-84, 6-86, and 7-87 are closed, or the inlet 11 and outlet 12 of the heat storage tank 1 are closed, the hot air inside the heat storage tank 1 naturally rises and the cold air naturally falls. The hot and cold air inside the heat storage tank 1 naturally convects from top to bottom, which reduces the temperature difference between the upper and lower parts of the rock until the temperature tends to be uniform.

[0074] like Figure 2 The thermal storage system 100 also includes a mounting bracket 110, on which the thermal storage unit 1 is mounted, such that the bottom of the thermal storage unit 1 is higher than the bottom of the mounting bracket 110, so as to form a gap below the thermal storage unit 1 for the installation of pipes, etc.

[0075] like Figure 1 The heat storage tank 1 is provided with an air inlet baffle 15 and an air outlet baffle 16 at intervals. The air inlet baffle 15 and the air outlet baffle 16 divide the internal cavity of the heat storage tank 1 into an air inlet cavity 17, a filling cavity 18, and an air outlet cavity 19. Multiple openings are evenly provided on both the air inlet baffle 15 and the air outlet baffle 16 to allow the inlet 11, air inlet cavity 17, filling cavity 18, air outlet cavity 19, and outlet 12 to be sequentially connected. The cross-sectional dimensions of the air inlet cavity 17 and the air outlet cavity 19 gradually increase towards the filling cavity 18. The air inlet cavity 17 and the air outlet cavity 19 facilitate the uniform entry and exit of air into and out of the filling cavity 18, improving the uniformity of heat exchange between the rock and the air. The air inlet baffle 15 and the air outlet baffle 16 block the air, causing it to disperse as it enters and exits the filling cavity 18, further improving the uniformity of heat exchange between the air and the rock.

[0076] To facilitate rock sampling and testing within the thermal storage tank 1, a sampling port is provided on the thermal storage tank 1, and a cover plate 13 is installed to close the sampling port. When rock sampling is required, the cover plate 13 is opened, and a tool is inserted into the filling cavity 18 through the sampling port to select a rock sample for testing. After sampling, the cover plate 13 is closed. The location of the sampling port can be flexibly set according to sampling needs. This sampling port also serves as an observation port. After long-term operation, such as thousands or tens of thousands of cycles, changes in rock shape can be observed and monitored through it. It can also serve as a backup port for unforeseen circumstances, such as adding, reducing, or replacing small quantities of rocks. The sampling port can also be used as an operating hole, through which tools can be used to enter the interior to adjust the stacking pattern of interfering rocks to maintain unobstructed passage.

[0077] like Figure 2 The heat storage tank 1 is provided with an auxiliary opening 14, such as Figure 3 The heat storage system 100 is also equipped with an internal heater 4, which is inserted into the filling cavity 18 from the auxiliary opening 14 and surrounded by rocks. It can heat the rocks and the air entering the filling cavity 18, thereby improving the uniformity of heating of the rocks in different areas of the filling cavity 18.

[0078] Overall, this utility model has the following advantages:

[0079] Using natural rocks is more environmentally friendly;

[0080] Natural rocks, compared to other thermal storage materials, reduce processing and manufacturing steps, thus lowering costs;

[0081] The addition of the second power fan enhances convective heat transfer, increases the system's heat charging and discharging speed, and improves the system's energy efficiency.

[0082] The addition of the power fan 2 makes the system more flexible and adjustable. For example, by using the variable frequency fan 2, the wind speed can be adjusted by adjusting the frequency of the fan 2, making the heat release power adjustable and improving the system's flexibility and adaptability.

[0083] When the rocks in the heat storage tank 1 are heated, hot air conducts heat from bottom to top, resulting in a temperature that is higher at the top and lower at the bottom. When the fan 2 is turned off and the tank is left to stand, natural circulation is used to allow the temperature to rise and fall, gradually making the temperature at the top and bottom more uniform and maximizing the utilization of the rock's heat storage capacity.

[0084] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rock thermal storage system, characterized in that, It includes: The heat storage device has an internal filling cavity filled with rock particles. The pores between the rock particles form air channels. The heat storage device has an inlet and an outlet that are connected through the air channels. A piping unit, located outside the heat storage tank, includes a first pipe, a second pipe, a third pipe, and a fourth pipe; The fan is installed on the second pipeline; An external heater is installed on the third pipeline; The outlet, the first pipeline, the second pipeline, the third pipeline, and the inlet are connected in sequence to form a heat charging path; The pipeline unit further includes a fifth pipeline, on which a heat exchanger for heating the liquid is provided. The outlet, the fifth pipeline, the second pipeline, the fourth pipeline, and the inlet are sequentially connected to form a first heat release path; and / or, the rock thermal storage system also includes an air inlet and an air outlet, on which the air inlet, the fan, the fourth pipeline, the inlet, the outlet, and the air outlet are sequentially connected to form a second heat release path.

2. The rock thermal storage system as described in claim 1, characterized in that, The pipeline unit also includes a sixth pipeline, and the third pipeline and the fourth pipeline are both connected to the inlet through the sixth pipeline; And / or, the piping unit further includes a seventh piping, through which the first piping and the fifth piping are connected to the outlet.

3. The rock thermal storage system as described in claim 1, characterized in that, The rock thermal storage system further includes a control valve unit, which comprises: Valve 1 and Valve 2 are respectively installed at both ends of the first pipeline; Valve three and valve four are respectively installed at both ends of the third pipeline; Valve five and valve six are respectively installed at both ends of the fourth pipeline; Valves 7 and 8 are respectively installed at both ends of the fifth pipeline, and / or valves 9 and 10 are respectively installed at the air inlet and the air outlet.

4. The rock thermal storage system as described in claim 1, characterized in that, The air inlet and the fifth pipeline are connected to a first connection point on the fifth pipeline, and the first connection point is located at the end of the heat exchanger facing the second pipeline along the first heat release path. And / or, the air outlet and the fifth pipeline are connected to a second connection point on the fifth pipeline, the second connection point being located at the end of the heat exchanger facing the outlet along the first heat release path.

5. The rock thermal storage system as described in claim 4, characterized in that, The rock thermal storage system also includes a control valve unit, which includes valve eight and valve nine. The air inlet is connected to the fifth pipeline through valve nine. Valve eight is located at one end of the fifth pipeline that is connected to the second pipeline. The heat exchanger, the first connection point, and valve eight are arranged sequentially along the first heat release path.

6. The rock thermal storage system as described in claim 4, characterized in that, The rock thermal storage system also includes a control valve unit, which includes valve seven, valve ten, and valve eleven. The air outlet is connected to the fifth pipeline through valve ten. Valve seven, the second connection point, valve eleven, and the heat exchanger are sequentially arranged on the fifth pipeline. Valve seven is located at the end of the fifth pipeline that is connected to the outlet.

7. The rock thermal storage system as described in claim 1, characterized in that, The inlet is located at the bottom of the thermal storage tank, and the outlet is located at the top of the thermal storage tank; And / or, the rock thermal storage system further includes a mounting bracket on which the thermal storage unit is mounted, with the bottom of the thermal storage unit being higher than the bottom of the mounting bracket.

8. The rock thermal storage system as described in claim 1, characterized in that, The rock thermal storage system further includes an air inlet baffle and an air outlet baffle, which are spaced apart within the cavity of the thermal storage unit, dividing the cavity inside the thermal storage unit into: The air inlet cavity is connected to the inlet. The filling cavity is located between the air inlet baffle and the air outlet baffle; The air outlet cavity is connected to the outlet. The air inlet baffle and the air outlet baffle are provided with multiple openings at even intervals to connect the air inlet cavity, the filling cavity and the air outlet cavity in sequence. The cross-sectional dimensions of the air inlet cavity and the air outlet cavity gradually increase in the direction close to the filling cavity.

9. The rock thermal storage system as described in claim 1, characterized in that, The heat storage device is provided with a sampling port and a cover plate. The sampling port is used to connect the outside of the heat storage device and the filling cavity, and the cover plate is used to close the sampling port.

10. The rock thermal storage system as described in claim 1, characterized in that, The rock thermal storage system also includes an internal heater. The thermal storage device is provided with an auxiliary opening that connects the outside of the thermal storage device to the filling cavity. The internal heater is inserted into the auxiliary opening and located inside the filling cavity.

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