Cross-season rock-soil energy storage recycling system

Abstract

The invention provides a cross-season rock-soil energy storage recycling system, and relates to the technical field of geothermal devices. Comprising a rock-soil energy storage heat exchange system, a heat pump system, a switching pipe network and an electric boiler heat storage system. The rock-soil energy storage and heat exchange system is used for exchanging heat with rock-soil, the heat pump system is connected with the rock-soil energy storage and heat exchange system, and the heat pump system is used for exchanging heat to a heat utilization building; the electric boiler heat storage system comprises a boiler heating assembly, a heat storage assembly and a heat release assembly. The boiler heating assembly is connected with the heat storage assembly, and the heat storage assembly is used for heat storage; the heat release assembly is connected with the heat storage assembly and the boiler heating assembly in a controlled mode. The heat release assembly exchanges heat with the switching pipe network, and the switching pipe network controls heat exchange with the rock-soil energy storage heat exchange system or the heat utilization building. The problem of heat balance of underground rock soil can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of geothermal devices, and in particular to a trans-seasonal rock and soil energy storage and recycling system. Background Art

[0002] Geotechnical energy storage systems utilize the Earth's natural environment, such as soil, rock, aquifers, or cavities, as a thermal energy storage medium. Geotechnical energy storage systems can provide a buffer between energy demand and supply, helping to balance grid loads, improve energy efficiency, and reduce carbon emissions.

[0003] Related art geotechnical energy storage and recycling systems generally include a heat pump system, a buried heat exchanger, a pipe network, and a circulation pump. The buried heat exchanger is buried in the geotechnical structure and connected to the heat pump system. The circulation pump circulates a fluid medium between the buried heat exchanger and the heat pump system, transferring heat energy from the geotechnical structure to the heat pump system. The heat pump system transports the fluid medium to the heat-using building and returns the fluid medium to supply heat to the heat-using building.

[0004] In the utilization of renewable energy, seasonal volatility and instability are unavoidable. On the one hand, the use of solar or wind energy for power generation results in regions with peak and valley electricity prices. Valley electricity prices are cheap, but the heat load demand may be low during valley electricity price periods, while the heat load demand is high during peak electricity price periods. On the other hand, the use of shallow geothermal energy in air-conditioning systems for heating buildings presents problems with geothermal thermal balance. While it is suitable for air-conditioning systems for heating buildings where winter heat loads match summer heat loads, the geothermal thermal balance problem limits the application scope of this clean energy. In particular, for clean heating in heating buildings, the buried heat exchangers used in related technologies cannot restore the thermal balance of the geothermal system by extracting heat alone. Cumulative operation over multiple heating and non-heating seasons will lead to cold accumulation in the geothermal system, disrupting the thermal balance of the underground soil. Over long-term operation, this imbalance will lead to an abnormal drop in soil temperature, which will affect the use of geothermal energy during the heating season. Summary of the Invention

[0005] In order to improve the heat balance problem of underground rock and soil, the present application provides a cross-seasonal rock and soil energy storage and recycling system.

[0006] This application provides a cross-seasonal rock and soil energy storage and recycling system, which adopts the following technical solutions: A trans-seasonal geotechnical energy storage and recycling system comprises a geotechnical energy storage and heat exchange system, a heat pump system, a switching pipe network, and an electric boiler heat storage system; the geotechnical energy storage and heat exchange system is used to exchange heat with geotechnical materials, the heat pump system is connected to the geotechnical energy storage and heat exchange system, and the heat pump system is used to exchange heat with heat-consuming buildings; The electric boiler heat storage system includes a boiler heating component, a heat storage component and a heat release component; the boiler heating component is connected to the heat storage component, and the heat storage component is used to store heat; the heat release component is controlled to be connected to the heat storage component and the boiler heating component respectively; the heat release component exchanges heat with the switching pipeline network, and the switching pipeline network is controlled to exchange heat with the geotechnical energy storage and heat exchange system or the heat-using building respectively.

[0007] By adopting the above technical solution, during the heating season, when the heat demand of the heating building is low, the geotechnical energy storage and heat exchange system absorbs heat from the geotechnical rock and transfers it to the heat pump system, which then supplies the heat to the heating building. When the heat demand of the heating building is high, during the nighttime off-peak electricity price period, the boiler heating assembly is activated. Part of the heat generated by the boiler heating assembly is transferred to the heat storage assembly for storage, and the remaining heat is transferred to the heat release assembly, which then supplies the heat to the heating building through a switching pipe network. During the daytime peak electricity price period, the heat storage assembly transfers heat to the heat release pipe network, which then supplies the heat to the heating building. Simultaneously, the geotechnical energy storage and heat exchange system and the heat pump system supply the heat from the geotechnical rock to the heating building. When the heat demand of the heating building increases, the boiler heating assembly is activated again. At this time, the boiler heating assembly, the heat storage assembly, and the geotechnical energy storage and heat exchange system simultaneously supply heat to the heating building to meet its heating needs.

[0008] During the off-season and transitional seasons, at night when electricity prices are low, the boiler heating component generates heat, transferring some of the heat to the thermal storage component for storage and the remaining heat to the heat release component. The heat release component then transfers the heat to the geotechnical energy storage and heat exchange system via a switching pipe network, where the heat is stored in the geotechnical environment. During the daytime when electricity prices are high, the thermal storage component transfers the heat to the heat release component, which then transfers the heat to the geotechnical energy storage and heat exchange system via a switching pipe network, where the heat is stored in the geotechnical environment.

[0009] This application uses a geotechnical heat storage system as the primary heat source for heating during the heating season, and an electric boiler heat storage system as an auxiliary heat source for peak load regulation. During the non-heating and transitional seasons, the electric boiler heat storage system stores heat in the geotechnical system, restoring and replenishing the heat, achieving year-round soil heat balance.

[0010] Optionally, the rock and soil energy storage and heat exchange system includes a heat exchange circulation pipeline, a buried heat exchanger and a geothermal circulation pump. The buried heat exchanger is buried in the rock and soil, and the heat exchange circulation pipeline is connected to the heat pump system and the buried heat exchanger respectively; the geothermal circulation pump is arranged on the heat exchange circulation pipeline, and the geothermal circulation pump enables the fluid medium in the heat exchange circulation pipeline to circulate between the heat pump system and the buried heat exchanger.

[0011] By adopting the above technical solution, the geothermal circulation pump is started, so that the fluid medium in the heat exchange circulation pipeline circulates between the heat pump system and the buried heat exchanger. The buried heat exchanger absorbs the heat in the rock and soil, thereby transferring the heat in the rock and soil to the heat pump system, realizing the utilization of the heat in the rock and soil.

[0012] Optionally, the heat pump system includes a geothermal heat pump main unit, a heating circulation pipeline and a terminal circulation pump, the geothermal heat pump main unit is connected to the heat exchange circulation pipeline; the heating circulation pipeline is respectively connected to the geothermal heat pump main unit and the heat-using building; the terminal circulation pump is arranged on the heating circulation pipeline, and the terminal circulation pump allows the fluid medium in the heating circulation pipeline to circulate between the geothermal heat pump main unit and the heat-using building.

[0013] By adopting the above technical solution, the ground source heat pump main unit transfers the heat in the heat exchange circulation pipeline to the heating circulation pipeline, starts the terminal circulation pump, and makes the fluid medium in the heating circulation pipeline circulate between the ground source heat pump main unit and the heat-using building, thereby transferring heat to the heat-using building.

[0014] Optionally, the boiler heating assembly includes an electrode boiler, a boiler circulation pump, a boiler circulation pipeline and a boiler plate heat exchanger; the boiler circulation pipeline is communicated with the electrode boiler and the boiler plate heat exchanger respectively, and the boiler circulation pump is arranged on the boiler circulation pipeline; The heat storage component includes a heat storage water tank, a heat storage circulation pipeline and a heat storage circulation pump; the heat storage circulation pipeline is connected to the heat storage water tank and the boiler plate heat exchanger respectively, and the heat storage circulation pump is arranged on the heat storage circulation pipeline.

[0015] By adopting the above technical solution, the boiler heating component is started, and the heat generated by the boiler heating component is transferred to the heat storage circulation pipeline through the boiler plate heat exchanger. The heat storage circulation pump circulates the fluid medium in the circulation pipeline, thereby storing part of the heat in the heat storage tank.

[0016] Optionally, the heat release assembly includes a heat release circulation pipeline, a heat release circulation pump, a terminal plate heat exchanger, a switch valve group, and an electric regulating valve group; the heat release circulation pipeline is connected to the heat storage circulation pipeline, the heat release circulation pump is arranged on the heat release circulation pipeline, and the heat release circulation pipeline is connected to the terminal plate heat exchanger; The switch valve group is arranged on the heat storage circulation pipeline, and the heat storage water tank and the boiler plate heat exchanger are respectively controlled by the switch valve group to be connected to the heat release circulation pipeline; the electric regulating valve group is arranged on the heat release circulation pipeline, and the electric regulating valve group controls the flow of the heat release circulation pipeline.

[0017] By adopting the above technical solution, through the control of the switch valve group, the heat storage tank can be connected to the heat release circulation pipeline, or the boiler plate heat exchanger can be connected to the heat release circulation pipeline, so that the boiler heating component can be controlled to directly supply heat, or the heat storage component can be controlled to supply heat.

[0018] Optionally, the switching pipeline network includes a terminal heating pipeline, a terminal heat storage pipeline, a heating valve group and a heat storage valve group; the terminal heating pipeline is respectively connected to the heating circulation pipeline and the terminal plate heat exchanger, and the heating valve group is arranged on the terminal heating pipeline, and the heating valve group controls the connection between the terminal plate heat exchanger and the heating circulation pipeline; The terminal heat storage pipeline is communicated with the terminal heat supply pipeline and the heat exchange circulation pipeline respectively. The heat storage valve group is arranged on the terminal heat storage pipeline. The heat storage valve group controls the communication between the heat exchange circulation pipeline and the terminal plate heat exchanger.

[0019] By adopting the above technical solution, when the heating valve group is opened and the heat storage valve group is closed, the heat release circulation pipeline transfers heat to the terminal heating pipeline through the terminal plate heat exchanger, and the terminal heating pipeline then supplies heat to the heat-consuming building through the heat supply circulation pipeline. When the heating valve group is closed and the heat storage valve group is opened, the heat release circulation pipeline transfers heat to the terminal heat storage pipeline through the terminal plate heat exchanger, and the terminal heat storage pipeline then transfers heat to the buried heat exchanger through the heat exchange circulation pipeline, and the buried heat exchanger stores the heat in the rock and soil.

[0020] Optionally, the buried heat exchanger includes an outer tube, an inner tube, a heat exchange sleeve, a return pipe, a heat conduction circulation component and a bottom heat exchange component; the inner tube is arranged inside the outer tube, the bottom end of the inner tube is connected to the bottom end of the outer tube, the heat exchange sleeve is arranged outside the inner tube, the bottom heat exchange component is arranged at the bottom end of the outer tube, and the bottom heat exchange component exchanges heat with the rock soil; The return pipe is respectively connected to the top end of the heat exchange sleeve and the bottom end heat exchange component, and the heat conduction circulation component is arranged between the outer pipe and the bottom end heat exchange component; the heat exchange sleeve is filled with heat conduction oil, and the heat conduction circulation component allows the heat conduction oil to circulate between the heat exchange sleeve, the return pipe and the bottom end heat exchange component.

[0021] By adopting this technical solution, the fluid medium flows downward from the top of the outer tube and then exits the inner tube. As it flows within the outer tube, the fluid medium absorbs heat from the rock and soil. The bottom heat exchange assembly absorbs the heat from the rock and soil. The heat circulation assembly circulates the thermal oil between the heat exchange sleeve, the return pipe, and the bottom heat exchange assembly, allowing the thermal oil to transfer heat from the rock and soil to the heat exchange sleeve. The heat exchange sleeve then transfers heat to the fluid medium in the outer and inner tubes, respectively, thereby improving the heat exchange efficiency of the buried heat exchanger.

[0022] Optionally, the heat conduction circulation assembly includes a mounting shell, circulation blades, a support ring seat, and spoiler blades; the mounting shell is connected to the bottom end of the inner tube, the circulation blades are rotatably connected to the mounting shell, the support ring seat is rotatably connected to the heat exchange sleeve, the support ring seat is connected to the circulation blades, and the spoiler blades are connected to the support ring seat; When the fluid medium flows from the top end to the bottom end of the outer tube, the spoiler blades are driven to rotate, and the spoiler blades drive the circulation blades to rotate through the support ring seat. The circulation blades cause the heat transfer oil in the bottom end heat exchange component to flow into the heat exchange sleeve.

[0023] By adopting the above technical solution, when the fluid medium flows from the top end to the bottom end of the outer tube, the fluid medium drives the turbulent blades to rotate, the turbulent blades drive the support ring seat to rotate, and the support ring seat drives the circulation blades to rotate. The circulation blades cause the heat transfer oil in the bottom end heat exchange component to flow into the heat exchange sleeve, thereby transferring the heat absorbed by the bottom end heat exchange component to the heat exchange sleeve, and the heat exchange sleeve then transfers the heat to the fluid medium in the outer tube and the inner tube respectively, thereby improving the heat exchange efficiency.

[0024] Optionally, a first heat exchange network is connected to the heat exchange sleeve.

[0025] By adopting the above technical solution, when the heat transfer oil flows in the heat exchange sleeve, the first heat exchange network can absorb a portion of the heat, which is conducive to transferring the heat to the fluid medium in the outer tube and the inner tube respectively, thereby improving the heat exchange efficiency.

[0026] Optionally, the bottom heat exchange component includes a bottom shell, a spiral guide blade, a second heat exchange network, a heat absorption column and a heat absorption ring plate; the bottom shell is connected to the bottom end of the outer tube, the heat absorption ring plate is sleeved on the circumference of the bottom shell, and the heat absorption column is connected to the bottom end of the bottom shell; the spiral guide blade is connected to the inside of the bottom shell, the second heat exchange network is connected to the inside of the bottom shell, and the return pipe passes through the spiral guide blade and extends into the bottom end of the bottom shell.

[0027] By adopting the above technical solution, the heat-absorbing column and the heat-absorbing ring plate transfer the heat of the rock and soil to the second heat exchange network. The heat-conducting oil enters the return pipe through the heat exchange sleeve. The return pipe allows the heat-conducting oil to enter the inner bottom end of the bottom shell. The heat-conducting oil flows along the spiral guide blades, so that the heat-conducting oil is in more complete contact with the second heat exchange network, which is conducive to absorbing the heat of the second heat exchange network and can improve the heat exchange efficiency.

[0028] In summary, this application has at least one of the following beneficial effects: 1. This application uses a geotechnical energy storage and heat exchange system as the primary heat source to provide heating during the heating season, and an electric boiler heat storage system as an auxiliary heat source for peak load regulation. During the non-heating and transitional seasons, the electric boiler heat storage system stores heat in the geotechnical system, restoring and replenishing the heat, thereby achieving year-round soil heat balance. 2. By controlling the switch valve group, the heat storage tank can be connected to the heat release circulation pipeline, or the boiler plate heat exchanger can be connected to the heat release circulation pipeline, thereby controlling the boiler heating component to directly supply heat, or controlling the heat storage component to supply heat; 3. The bottom heat exchange component absorbs the heat of the rock and soil, and the heat circulation component circulates the heat transfer oil between the heat exchange sleeve, the return pipe and the bottom heat exchange component, so that the heat transfer oil transfers the heat in the rock and soil to the heat exchange sleeve. The heat exchange sleeve transfers heat to the fluid medium in the outer tube and the inner tube respectively, thereby improving the heat exchange efficiency of the buried heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the inter-seasonal geotechnical energy storage and recycling system of Example 1 of the present application; Figure 2 This is a schematic structural diagram of the geotechnical energy storage and heat exchange system, heat pump system, and heat exchange pipe network of Example 1 of the present application; Figure 3 This is a structural diagram of the electric boiler heat storage system in Example 1 of the present application; Figure 4 This is a schematic structural diagram of the buried heat exchanger of Example 2 of the present application; Figure 5 yes Figure 4 Schematic diagram of the local structure after removing the first heat exchange network and the second heat exchange network.

[0030] Explanation of the reference numerals: 1. geotechnical energy storage and heat exchange system; 11. heat exchange circulation pipeline; 12. buried heat exchanger; 121. outer pipe; 122. inner pipe; 123. connecting pipe; 124. heat exchange sleeve; 125. first heat exchange network; 126. return pipe; 127. heat conduction circulation assembly; 1271. mounting shell; 1272. circulation blade; 1273. support ring seat; 1274. spoiler blade; 128. bottom end heat exchange assembly; 1281. bottom shell; 1282. spiral guide blade; 1283. second heat exchange network; 1284. heat absorption column; 1285. heat absorption ring plate; 13. geothermal circulation pump; 2. heat exchanger Pump system; 21. Ground source heat pump main unit; 22. Heating circulation pipeline; 23. Terminal circulation pump; 3. Switching pipeline network; 31. Terminal heating pipeline; 32. Terminal heat storage pipeline; 4. Electric boiler heat storage system; 41. Boiler heating component; 411. Electrode boiler; 412. Boiler circulation pump; 413. Boiler circulation pipeline; 414. Boiler plate heat exchanger; 42. Heat storage component; 421. Heat storage tank; 422. Heat storage circulation pipeline; 423. Heat storage circulation pump; 43. Heat release component; 431. Heat release circulation pipeline; 432. Heat release circulation pump; 433. Terminal plate heat exchanger; 100. Heat-using building. DETAILED DESCRIPTION

[0031] The following combination Figures 1 to 5 This application is described in further detail.

[0032] Example 1: Example 1 of the present application provides a cross-seasonal rock and soil energy storage and recycling system.

[0033] refer to Figure 1 and Figure 2 A trans-seasonal geotechnical energy storage and recycling system includes a geotechnical energy storage and heat exchange system 1, a heat pump system 2, a switching pipe network 3, and an electric boiler heat storage system 4. The geotechnical energy storage and heat exchange system 1 is connected to the heat pump system 2, which is connected to a heat-using building 100. Heat within the geotechnical energy storage and heat exchange system 1 and the heat pump system 2 is transferred to the heat-using building 100. The electric boiler heat storage system 4 is connected to the switching pipe network 3. The electric boiler heat storage system 4 transfers heat to the heat-using building 100 via the switching pipe network 3, or the electric boiler heat storage system 4 transfers heat to the geotechnical energy storage and heat exchange system 1 via the switching pipe network 3. The geotechnical energy storage and heat exchange system 1 stores heat within the geotechnical energy storage and heat exchange system 1.

[0034] refer to Figure 1 and Figure 2The geotechnical energy storage and heat exchange system 1 includes a heat exchange circulation pipeline 11, a buried heat exchanger 12, a geothermal circulation pump 13, an electric on / off valve V9, an electric on / off valve V10, and a heat meter R1. The buried heat exchanger 12 is buried in the geotechnical soil and can exchange heat with the geotechnical soil. The heat exchange circulation pipeline 11 is connected to the buried heat exchanger 12, and the geothermal circulation pump 13 is installed on the heat exchange circulation pipeline 11 to circulate the fluid medium within the heat exchange circulation pipeline 11.

[0035] refer to Figure 1 and Figure 2 The heat exchange circulation pipeline 11 has a water supply pipe and a water return pipe. An electric on-off valve V9 is installed on the water supply pipe of the heat exchange circulation pipeline 11. The electric on-off valve V9 can control the on / off of the water supply pipe of the heat exchange circulation pipeline 11. An electric on-off valve V10 is installed on the return pipe of the heat exchange circulation pipeline 11. The electric on-off valve V10 can control the on / off of the return pipe of the heat exchange circulation pipeline 11. A heat meter R1 is installed on the water supply pipe of the heat exchange circulation pipeline 11. The heat meter R1 detects the temperature of the fluid medium in the water supply pipe of the heat exchange circulation pipeline 11.

[0036] refer to Figure 1 and Figure 2 The heat pump system 2 includes a ground-source heat pump unit 21, a heating circulation pipeline 22, a terminal circulation pump 23, a heat meter R2, an electric on / off valve V12, and an electric on / off valve V11. The heating circulation pipeline 22 is connected to the ground-source heat pump unit 21, and the heat exchange circulation pipeline 11 is connected to the ground-source heat pump unit 21. The ground-source heat pump unit 21 transfers heat from the heat exchange circulation pipeline 11 to the heating circulation pipeline 22. The terminal circulation pump 23 is installed on the heating circulation pipeline 22 and circulates the fluid medium in the heating circulation pipeline 22. The heating circulation pipeline 22 exchanges heat with the heat-consuming building 100, thereby supplying heat to the heat-consuming building 100.

[0037] refer to Figure 1 and Figure 2 The heating circulation pipeline 22 has a water supply pipe and a water return pipe. An electric on-off valve V12 is installed on the water supply pipe of the heating circulation pipeline 22 to control the opening and closing of the water supply pipe. An electric on-off valve V11 is installed on the return pipe of the heating circulation pipeline 22 to control the opening and closing of the return pipe of the heating circulation pipeline 22. A heat meter R2 is installed on the water supply pipe of the heating circulation pipeline 22 to detect the temperature of the fluid medium in the water supply pipe of the heating circulation pipeline 22.

[0038] refer to Figure 1 and Figure 3The electric boiler heat storage system 4 includes a boiler heating assembly 41, a heat storage assembly 42, and a heat release assembly 43. The boiler heating assembly 41 includes an electrode boiler 411, a boiler circulation pump 412, a boiler circulation pipeline 413, and a boiler plate heat exchanger 414. The boiler circulation pipeline 413 is connected to the electrode boiler 411 and the boiler plate heat exchanger 414, respectively. The boiler circulation pump 412 is installed on the boiler circulation pipeline 413 and circulates the fluid medium in the boiler circulation pipeline 413 and the electrode boiler 411.

[0039] refer to Figure 1 and Figure 3 Thermal storage assembly 42 includes a hot water storage tank 421, a thermal storage circulation pipeline 422, and a thermal storage circulation pump 423. Thermal storage circulation pipeline 422 is connected to hot water storage tank 421 and boiler plate heat exchanger 414, respectively. Boiler plate heat exchanger 414 transfers heat from boiler circulation pipeline 413 to thermal storage circulation pipeline 422. Thermal storage circulation pump 423 is installed on thermal storage circulation pipeline 422 and circulates the fluid medium in thermal storage circulation pipeline 422 and hot water storage tank 421, allowing hot water storage tank 421 to store heat.

[0040] refer to Figure 1 and Figure 3 The heat release assembly 43 includes a heat release circulation pipeline 431, a heat release circulation pump 432, a terminal plate heat exchanger 433, an on-off valve assembly, and an electric regulating valve assembly. The heat release circulation pipeline 431 is connected to the heat storage circulation pipeline 422 and the terminal plate heat exchanger 433 respectively. The heat release circulation pump 432 is installed on the heat release circulation pipeline 431.

[0041] refer to Figure 1 and Figure 3 The switch valve assembly includes an electric switch valve V1, an electric switch valve V2, an electric switch valve V3, and an electric switch valve V4. The heat storage circulation pipeline 422 has a water supply pipe and a return pipe, and the heat release circulation pipeline 431 has a water supply pipe and a return pipe. The electric switch valve V3 and the electric switch valve V4 are both installed on the water supply pipe of the heat storage circulation pipeline 422. The water supply pipe of the heat release circulation pipeline 431 is connected to the water supply pipe of the heat storage circulation pipeline 422, and the connection point is located between the electric switch valve V3 and the electric switch valve V4. The electric switch valve V1 and the electric switch valve V2 are both installed on the return pipe of the heat storage circulation pipeline 422. The return pipe of the heat release circulation pipeline 431 is connected to the return pipe of the heat storage circulation pipeline 422, and the connection point is located between the electric switch valve V1 and the electric switch valve V2.

[0042] refer to Figure 1 and Figure 3The electric regulating valve group includes an electric regulating valve T1 and an electric regulating valve T2. The electric regulating valve T2 is installed on the water supply pipe of the heat release circulation pipeline 431, and the electric regulating valve T1 is installed on the return pipe of the heat release circulation pipeline 431. The electric regulating valve T1 and the electric regulating valve T2 can adjust the flow rate of the heat release circulation pipeline 431.

[0043] refer to Figure 1 and Figure 3 When the electric switch valve V3 and the electric switch valve V2 are closed, and the electric switch valve V1, the electric switch valve V4, the electric regulating valve T1 and the electric regulating valve T2 are opened, the boiler plate heat exchanger 414 transfers heat to the heat release circulation pipeline 431, which is the direct drive heating of the boiler heating component 41.

[0044] refer to Figure 1 and Figure 3 When the electric switch valve V1 and the electric switch valve V4 are closed, and the electric switch valve V3, the electric switch valve V2, the electric regulating valve T1 and the electric regulating valve T2 are opened, the heat storage tank 421 transfers heat to the heat release circulation pipeline 431.

[0045] refer to Figure 1 and Figure 3 When the electric switch valve V1, the electric switch valve V2, the electric switch valve V3, the electric switch valve V4, the electric regulating valve T1 and the electric regulating valve T2 are opened, the boiler heating component 41 transfers part of the heat to the heat storage tank 421 for storage, and transfers the other part of the heat to the heat release circulation pipeline 431.

[0046] refer to Figure 1 and Figure 3 The switching network 3 includes a terminal heat supply pipeline 31, a heat supply valve group, a terminal heat storage pipeline 32, and a heat storage valve group. The terminal heat supply pipeline 31 is connected to the terminal plate heat exchanger 433 and the heat supply circulation pipeline 22 respectively, and the terminal heat storage pipeline 32 is connected to the terminal heat supply pipeline 31 and the heat exchange circulation pipeline 11 respectively.

[0047] refer to Figure 1 and Figure 3 The heating valve group includes electric on / off valves V5 and V6, and the heat storage valve group includes electric on / off valves V8 and V7. The terminal heating pipeline 31 has a water supply pipe and a return pipe. Electric on / off valve V5 is installed on the return pipe of the terminal heating pipeline 31, and electric on / off valve V6 is installed on the water supply pipe of the terminal heating pipeline 31. The terminal heat storage pipeline 32 has a water supply pipe and a return pipe. Electric on / off valve V8 is installed on the water supply pipe of the terminal heat storage pipeline 32, and electric on / off valve V7 is installed on the return pipe of the terminal heat storage pipeline 32.

[0048] refer to Figure 1 and Figure 3When electric on / off valves V5 and V6 are opened, and electric on / off valves V8 and V7 are closed, the terminal plate heat exchanger 433 transfers heat to the terminal heating pipeline 31, which then supplies heat to the heat-consuming building 100 via the heat supply circulation pipeline 22. When electric on / off valves V8 and V7 are opened, and electric on / off valves V5 and V6 are closed, the terminal plate heat exchanger 433 transfers heat to the terminal heat storage pipeline 32, which then transfers the heat to the buried heat exchanger 12 via the heat exchange circulation pipeline 11. The buried heat exchanger 12 stores the heat in the rock and soil.

[0049] For the present application, it is assumed that the total heat load of the heat-using building 100 is 5MW, the heat-using time is from November 1 to March 31 of the following year, and it runs for 10 hours from 8:00 to 18:00 every day. A ground-source heat pump main unit 21 with a heating capacity of 3MW is used. The ground-source heat pump main unit 21 makes the temperatures of the supply pipe and return pipe of the heating circulation pipeline 22 50°C and 40°C respectively.

[0050] During the heating season (winter), at the beginning and end of the heating period, when the hourly load of heat-using building 100 is ≤3MW, electric on-off valves V9, V10, V11, and V12 are opened, and geotechnical energy storage heat exchange system 1 and heat pump system 2 are activated to cover the heat load of heat-using building 100. All other valves and equipment are closed. When the hourly load of heat-using building 100 exceeds 3MW during the nighttime off-peak electricity price period, the heat load exceeding 3MW is directly supplied by electrode boiler 411. At this time, V9, V10, V11, V12, V1, V4, V5, V6, T1, and T2 are opened, and geotechnical energy storage heat exchange system 1, heat pump system 2, boiler heating assembly 41, and heat release assembly 43 are activated. All other valves and equipment are closed. When the hourly load of heat-using building 100 is less than 3MW during the nighttime off-peak electricity price period, electrode boiler 411 generates heat, which is stored in heat storage tank 421.

[0051] At the beginning and end of heating, when the hourly load of the heat-consuming building 100 during the daytime peak electricity price period is greater than 3MW, the heat load exceeding 3MW is borne by the heat storage tank 421. At this time, V9, V10, V11, V12, V5, V6, V2, V3, T1 and T2 are turned on, the geotechnical energy storage and heat exchange system 1, the heat pump system 2, the heat storage component 42 and the heat release component 43 are turned on, and the remaining valves and equipment are closed.

[0052] During the coldest heating season, when the hourly load of heating building 100 exceeds 3MW, geotechnical energy storage and heat exchange system 1 is coupled with electric boiler heat storage system 4 to operate, jointly bearing the heating load of heating building 100. When the hourly load of heating building 100 exceeds 3MW during the nighttime off-peak electricity price period, valves and equipment are opened in the same manner as at the beginning and end of the heating period. When the hourly load of heating building 100 exceeds 3MW during the daytime peak electricity price period, valves and equipment are opened in the same manner as at the beginning and end of the heating period. If the hot water storage tank 421 still cannot meet the heating load requirements during the coldest heating season, the electrode boiler 411 is synchronously activated for direct supply. At this time, V9, V10, V11, V12, V1, V2, V3, V4, V5, V6, T1, and T2 are opened, and geotechnical energy storage and heat exchange system 1, heat pump system 2, boiler heating component 41, heat storage component 42, and heat release component 43 are opened. All other valves and equipment are closed.

[0053] During the non-heating season (summer) and transition season (spring and autumn), for the nighttime off-peak electricity price period, the electrode boiler 411 with a heating capacity of 5MW sets the water supply pipe and return pipe of the boiler circulation pipeline 413 to 90°C and 70°C respectively, and the water supply pipe and return pipe of the heat storage circulation pipeline 422 are heated to 85°C and 50°C respectively through the boiler plate heat exchanger 414. 60% of the hot water flow is exchanged through the terminal plate heat exchanger 433 to heat the terminal heat storage pipeline 322. After the water supply pipe and the return pipe are heat-exchanged to 50°C and 40°C respectively, they are reversely circulated to the buried heat exchanger 12 of the geotechnical energy storage and heat exchange system 1, and heat is transferred to the surrounding geotechnical rock and soil through the buried heat exchanger 12. Heat is stored in the geotechnical rock and soil, and the heat of the remaining 40% of the flow rate of hot water is stored in the heat storage tank 421. At this time, V1, V2, V3, V4, V7, V8, T1 and T2 are turned on, the geotechnical energy storage and heat exchange system 1 and the electric boiler heat storage system 4 are turned on, and the remaining valves and equipment are closed.

[0054] During the daytime peak electricity price period in the non-heating season and the transition season, the heat storage tank 421 makes the temperatures of the water supply pipe and the return pipe of the heat release circulation pipeline 431 85°C and 50°C respectively. After heat exchange through the terminal plate heat exchanger 433, the water supply pipe and the return pipe of the terminal heat storage pipeline 32 are heated to 50°C and 40°C respectively, and then reversely circulated to the buried heat exchanger 12 of the geotechnical energy storage and heat exchange system 1. Heat is transferred to the surrounding soil through the buried heat exchanger 12, and heat is stored in the geotechnical energy storage and heat exchange system. At this time, valves V2, V3, V7, V8, T1 and T2 are opened, the heat storage component 42, the heat release component 43 and the geotechnical energy storage and heat exchange system 1 are opened, and the remaining valves and equipment are closed.

[0055] This application operates according to a model of 5 months of operation in the heating season - 1 month of natural recovery - 2 months of supplementary heating - 1 month of natural recovery - 1 month of supplementary heating - 2 months of natural recovery, to achieve a cross-season energy storage and energy use mode for the system.

[0056] The implementation principle of a cross-seasonal geotechnical energy storage and recycling system in Example 1 of the present application is as follows: during the nighttime off-peak electricity price period of the heating season, on the one hand, the geotechnical energy storage and heat exchange system 1 absorbs thermal energy in the geotechnical rock and soil, and supplies heat to the heat-using building 100 through the heat pump system 2; on the other hand, the electrode boiler 411 generates heat, and the heat storage tank 421 stores the heat generated by the electrode boiler 411. If the heat demand of the heat-using building 100 is high, the excess is directly supplied by the electrode boiler 411. For the daytime peak electricity price period of the heating season, on the one hand, the geotechnical energy storage and heat exchange system 1 supplies heat to the heat-using building 100 through the heat pump system 2; on the other hand, the heat storage component 42 and the heat release component 43 are turned on to supply heat to the heat-using building 100. When the heat storage component 42 cannot meet the heat demand during the severe cold period of heating, the boiler heating component 41 is turned on synchronously, so that the boiler heating component 41, the heat storage component 42 and the geotechnical energy storage and heat exchange system 1 supply heat to the heat-using building 100; During the off-season nighttime off-peak electricity price period, part of the heat generated by the boiler heating assembly 41 is stored in the heat storage assembly 42, and the remaining part is stored in the rock and soil via the rock and soil energy storage and heat exchange system 1. During the off-season daytime peak electricity price period, the heat storage assembly 42, the heat release assembly 43, and the rock and soil energy storage and heat exchange system 1 operate to store heat in the rock and soil.

[0057] Example 2: Example 2 of the present application provides a cross-seasonal rock and soil energy storage and recycling system. The difference between Example 2 of the present application and Example 1 is that: refer to Figure 4 and Figure 5 The buried heat exchanger 12 includes an outer tube 121, an inner tube 122, a connecting pipe 123, a heat exchange sleeve 124, and a return pipe 126. The inner tube 122 is located inside the outer tube 121, and the outer tube 121 and the inner tube 122 are coaxial. The bottom end of the outer tube 121 and the inner tube 122 are connected by the connecting pipe 123. The inner tube 122 is connected to the water supply pipe of the heat exchange circulation pipeline 11, and the outer tube 121 is connected to the return pipe of the heat exchange circulation pipeline 11. The fluid medium enters the inner tube 122 from the outer tube 121 through the connecting pipe 123. The heat of the rock and soil is transferred to the fluid medium in the outer tube 121 through the outer tube 121. The heat exchange sleeve 124 is installed outside the inner tube 122, and the heat exchange sleeve 124 is located between the outer tube 121 and the inner tube 122. The connecting pipe 123 passes through the heat exchange sleeve 124. The return pipe 126 is located in the inner pipe 122 , and the top end of the return pipe 126 is connected to the top end of the heat exchange sleeve 124 .

[0058] refer to Figure 4 and Figure 5The borehole heat exchanger 12 also includes a heat conduction circulation assembly 127 and a bottom heat exchange assembly 128. The bottom heat exchange assembly 128 comprises a bottom shell 1281, spiral guide vanes 1282, a second heat exchange network 1283, heat absorbing columns 1284, and a heat absorbing ring plate 1285. The bottom shell 1281 is fixedly connected to the bottom end of the outer tube 121, and the bottom end of the return pipe 126 extends into the inner bottom end of the bottom shell 1281. The heat absorbing ring plate 1285 is sleeved around the side of the bottom shell 1281. The heat absorbing columns 1284 are fixedly connected to the bottom side of the bottom shell 1281, the spiral guide vanes 1282 are fixedly connected to the bottom shell 1281, and the second heat exchange network 1283 is filled in the bottom shell 1281. The heat absorbing columns 1284 and the heat absorbing ring plate 1285 can transfer heat from the rock and soil to the second heat exchange network 1283.

[0059] refer to Figure 4 and Figure 5 The heat transfer circulation assembly 127 includes a mounting housing 1271, circulation blades 1272, a support ring seat 1273, and flow-disturbing blades 1274. The mounting housing 1271 is fixedly connected to the bottom ends of the inner tube 122 and the outer tube 121, respectively. The circulation blades 1272 are rotatably connected within the mounting housing 1271. The support ring seat 1273 is rotatably connected to the heat exchange sleeve 124, fixedly connected to the circulation blades 1272, and fixedly connected to the support ring seat 1273. The flow-disturbing blades 1274 are fixedly connected to the support ring seat 1273.

[0060] refer to Figure 4 and Figure 5 The bottom shell 1281, mounting shell 1271, heat exchange sleeve 124, and return pipe 126 are sequentially connected and filled with heat transfer oil. The support ring seat 1273 seals against the heat exchange sleeve 124 and outer tube 121, preventing the fluid in the outer tube 121 from entering the mounting shell 1271. As the fluid in the outer tube 121 flows from top to bottom, it rotates the flow-disturbing vanes 1274, which in turn rotate the support ring seat 1273. The support ring seat 1273 then rotates the circulation vanes 1272, which then direct the heat transfer oil in the bottom shell 1281 into the heat exchange sleeve 124. A first heat exchange network 125 is fixedly connected to the heat exchange sleeve 124. Heat transfer oil passes through this network, where it absorbs heat. The network 125 and the heat exchange sleeve 124 then transfer the heat to the fluids in the outer tube 121 and inner tube 122, respectively. The heat transfer oil in the heat exchange sleeve 124 flows into the return pipe 126, which then flows the oil to the inner bottom end of the bottom shell 1281. The return pipe 126 is coated with a thermal insulation material to minimize heat exchange between the return pipe 126 and the fluid in the inner tube 122.

[0061] The implementation principle of a cross-seasonal rock and soil energy storage and recycling system in Example 2 of the present application is as follows: when the rock and soil energy storage and heat exchange system 1 is needed to provide heat, the heat of the rock and soil is transferred to the fluid medium through the outer tube 121, the bottom heat exchange component 128 absorbs the heat of the rock and soil, and the heat conduction circulation component 127 transfers the heat of the bottom heat exchange component 128 to the heat exchange sleeve 124, and the heat exchange sleeve 124 then transfers the heat to the fluid medium of the outer tube 121 and the inner tube 122, and the inner tube 122 transports the heated fluid medium to the water supply pipe of the heat exchange circulation pipeline 11. When the geotechnical energy storage and heat exchange system 1 is needed to store heat in the geotechnical material, the heat of the fluid medium in the outer tube 121 is transferred to the geotechnical material through the outer tube 121, and the outer tube 121 and the inner tube 122 transfer the heat to the heat exchange sleeve 124. The heat circulation component 127 enables the heat transfer oil to transfer the heat to the bottom heat exchange component 128, and the bottom heat exchange component 128 then transfers the heat to the geotechnical material.

[0062] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A trans-seasonal rock and soil energy storage and recycling system, characterized in that: It comprises a rock-soil energy storage and heat exchange system (1), a heat pump system (2), a switching pipe network (3) and an electric boiler heat storage system (4); the rock-soil energy storage and heat exchange system (1) is used to exchange heat with rock-soil, the heat pump system (2) is connected to the rock-soil energy storage and heat exchange system (1), and the heat pump system (2) is used to exchange heat with a heat-using building (100); The electric boiler heat storage system (4) comprises a boiler heating component (41), a heat storage component (42) and a heat release component (43); the boiler heating component (41) is connected to the heat storage component (42), and the heat storage component (42) is used to store heat; the heat release component (43) is controlled to be connected to the heat storage component (42) and the boiler heating component (41); the heat release component (43) exchanges heat with the switching pipe network (3), and the switching pipe network (3) is controlled to exchange heat with the geotechnical energy storage and heat exchange system (1) or the heat-using building (100).

2. The cross-seasonal rock and soil energy storage and recycling system according to claim 1 is characterized in that: The rock-soil energy storage and heat exchange system (1) comprises a heat exchange circulation pipeline (11), a buried heat exchanger (12) and a geothermal circulation pump (13); the buried heat exchanger (12) is buried in the rock and soil, and the heat exchange circulation pipeline (11) is connected to the heat pump system (2) and the buried heat exchanger (12) respectively; the geothermal circulation pump (13) is arranged on the heat exchange circulation pipeline (11), and the geothermal circulation pump (13) allows the fluid medium in the heat exchange circulation pipeline (11) to circulate between the heat pump system (2) and the buried heat exchanger (12).

3. The cross-seasonal rock and soil energy storage and recycling system according to claim 2 is characterized in that: The heat pump system (2) comprises a ground source heat pump main unit (21), a heat supply circulation pipeline (22) and a terminal circulation pump (23); the ground source heat pump main unit (21) is connected to the heat exchange circulation pipeline (11); the heat supply circulation pipeline (22) is respectively connected to the ground source heat pump main unit (21) and the heat-using building (100); the terminal circulation pump (23) is arranged on the heat supply circulation pipeline (22), and the terminal circulation pump (23) allows the fluid medium in the heat supply circulation pipeline (22) to circulate between the ground source heat pump main unit (21) and the heat-using building (100).

4. The cross-seasonal rock and soil energy storage and recycling system according to claim 3 is characterized in that: The boiler heating assembly (41) includes an electrode boiler (411), a boiler circulation pump (412), a boiler circulation pipeline (413), and a boiler plate heat exchanger (414); the boiler circulation pipeline (413) is respectively connected to the electrode boiler (411) and the boiler plate heat exchanger (414), and the boiler circulation pump (412) is arranged on the boiler circulation pipeline (413); The heat storage component (42) comprises a heat storage tank (421), a heat storage circulation pipeline (422), and a heat storage circulation pump (423); the heat storage circulation pipeline (422) is respectively connected to the heat storage tank (421) and the boiler plate heat exchanger (414), and the heat storage circulation pump (423) is arranged on the heat storage circulation pipeline (422).

5. The cross-seasonal rock and soil energy storage and recycling system according to claim 4 is characterized in that: The heat release component (43) includes a heat release circulation pipeline (431), a heat release circulation pump (432), a terminal plate heat exchanger (433), a switch valve group, and an electric regulating valve group; the heat release circulation pipeline (431) is in communication with the heat storage circulation pipeline (422), the heat release circulation pump (432) is arranged on the heat release circulation pipeline (431), and the heat release circulation pipeline (431) is in communication with the terminal plate heat exchanger (433); The switch valve group is arranged on the heat storage circulation pipeline (422), and the heat storage water tank (421) and the boiler plate heat exchanger (414) are respectively controlled to communicate with the heat release circulation pipeline (431) through the switch valve group; the electric regulating valve group is arranged on the heat release circulation pipeline (431), and the electric regulating valve group controls the flow of the heat release circulation pipeline (431).

6. The inter-seasonal rock and soil energy storage and recycling system according to claim 5 is characterized in that: The switching pipe network (3) includes a terminal heating pipeline (31), a terminal heat storage pipeline (32), a heating valve group, and a heat storage valve group; the terminal heating pipeline (31) is respectively connected to the heating circulation pipeline (22) and the terminal plate heat exchanger (433); the heating valve group is arranged on the terminal heating pipeline (31), and the heating valve group controls the connection between the terminal plate heat exchanger (433) and the heating circulation pipeline (22); The terminal heat storage pipeline (32) is respectively connected to the terminal heat supply pipeline (31) and the heat exchange circulation pipeline (11); the heat storage valve group is arranged on the terminal heat storage pipeline (32); and the heat storage valve group controls the connection between the heat exchange circulation pipeline (11) and the terminal plate heat exchanger (433).

7. The inter-seasonal rock and soil energy storage and recycling system according to claim 2 is characterized in that: The buried heat exchanger (12) comprises an outer tube (121), an inner tube (122), a heat exchange sleeve (124), a return pipe (126), a heat conduction circulation component (127) and a bottom heat exchange component (128); the inner tube (122) is arranged in the outer tube (121), the bottom end of the inner tube (122) is connected to the bottom end of the outer tube (121), the heat exchange sleeve (124) is sleeved on the outside of the inner tube (122), the bottom heat exchange component (128) is arranged at the bottom end of the outer tube (121), and the bottom heat exchange component (128) exchanges heat with rock and soil; The return pipe (126) is respectively connected to the top end of the heat exchange sleeve (124) and the bottom end heat exchange component (128), and the heat conduction circulation component (127) is arranged between the outer pipe (121) and the bottom end heat exchange component (128); the heat exchange sleeve (124) is filled with heat conduction oil, and the heat conduction circulation component (127) allows the heat conduction oil to circulate between the heat exchange sleeve (124), the return pipe (126) and the bottom end heat exchange component (128).

8. The inter-seasonal rock and soil energy storage and recycling system according to claim 7 is characterized in that: The heat conduction circulation assembly (127) comprises a mounting shell (1271), a circulation blade (1272), a support ring seat (1273) and a spoiler blade (1274); the mounting shell (1271) is connected to the bottom end of the inner tube (122); the circulation blade (1272) is rotatably connected to the mounting shell (1271); the support ring seat (1273) is rotatably connected to the heat exchange sleeve (124); the support ring seat (1273) is connected to the circulation blade (1272); and the spoiler blade (1274) is connected to the support ring seat (1273); When the fluid medium flows from the top to the bottom of the outer tube (121), the flow-disturbing blades (1274) are driven to rotate. The flow-disturbing blades (1274) drive the circulation blades (1272) to rotate via the support ring seat (1273). The circulation blades (1272) cause the heat transfer oil in the bottom heat exchange assembly (128) to flow into the heat exchange sleeve (124).

9. The inter-seasonal rock and soil energy storage and recycling system according to claim 8, characterized in that: The heat exchange sleeve (124) is connected to a first heat exchange network (125).

10. The inter-seasonal rock and soil energy storage and recycling system according to claim 7, characterized in that: The bottom heat exchange component (128) comprises a bottom shell (1281), a spiral guide blade (1282), a second heat exchange network (1283), a heat absorption column (1284) and a heat absorption ring plate (1285); the bottom shell (1281) is connected to the bottom end of the outer tube (121), the heat absorption ring plate (1285) is sleeved on the circumference of the bottom shell (1281), and the heat absorption column (1284) is connected to the bottom end of the bottom shell (1281); the spiral guide blade (1282) is connected to the inside of the bottom shell (1281), the second heat exchange network (1283) is connected to the inside of the bottom shell (1281), and the return pipe (126) passes through the spiral guide blade (1282) and extends into the bottom end of the bottom shell (1281).

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