Cross-seasonal geotechnical energy storage and recycling system

Abstract

The application provides a cross-seasonal rock-soil energy storage and recycling system, and relates to the technical field of geothermal devices. The system comprises a rock-soil energy storage and 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 heat exchange with rock-soil. The heat pump system is connected with the rock-soil energy storage and heat exchange system. The heat pump system is used for heat exchange with a heat-using building. The electric boiler heat storage system comprises a boiler heating assembly, a heat storage assembly and a heat releasing assembly. The boiler heating assembly is connected with the heat storage assembly. The heat storage assembly is used for heat storage. The heat releasing assembly is respectively connected with the heat storage assembly and the boiler heating assembly. The heat releasing assembly exchanges heat with the switching pipe network. The switching pipe network respectively controls heat exchange with the rock-soil energy storage and heat exchange system or the heat-using building. The application can improve the problem of underground rock-soil heat balance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal devices, and particularly relates to a cross-seasonal geothermal energy storage and recycling system. BACKGROUND

[0002] The geothermal energy storage and recycling system refers to a system that uses the natural environment inside the earth, such as soil, rock, aquifer or cavity, as a heat storage medium. The geothermal energy storage and recycling system can provide a buffer between energy demand and supply, help balance the power grid load, improve energy efficiency, and reduce carbon emissions.

[0003] The geothermal energy storage and recycling system in the related art generally includes a heat pump system, a buried pipe heat exchanger, a pipe network and a circulating pump. The buried pipe heat exchanger is buried in the geothermal energy storage and recycling system. The buried pipe heat exchanger is in communication with the heat pump system. The circulating pump circulates the fluid medium between the buried pipe heat exchanger and the heat pump system, so as to transfer the heat energy in the geothermal energy storage and recycling system to the heat pump system. The heat pump system transports the fluid medium to the heat-using building and returns the fluid medium, so as to supply heat to the heat-using building.

[0004] In the utilization of renewable energy, the seasonal fluctuation and instability of renewable energy are inevitable. On the one hand, the use of solar or wind power for power generation results in the existence of areas with peak and valley electricity prices. The valley electricity price is cheap, but the heat load demand may be small during the valley electricity price period, while the heat load demand is large during the peak electricity price period. On the other hand, the use of shallow geothermal energy in the air conditioning system of the heat-using building has the problem of geothermal heat balance. It is suitable for the air conditioning system of the heat-using building whose heat load in winter matches that in summer. The problem of geothermal heat balance limits the application range of this clean energy. In particular, for clean heating of the heat-using building, the buried pipe heat exchanger in the related art cannot recover the geothermal heat balance alone. The cumulative operation of multiple heating seasons and non-heating seasons will result in cold accumulation in the geothermal energy storage and recycling system, which will destroy the heat balance of the underground soil. In the long run, this imbalance will cause the abnormal reduction of the soil temperature, thereby affecting the use of geothermal energy in the heating season. SUMMARY

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

[0006] The present application provides a cross-seasonal geothermal energy storage and recycling system, which adopts the following technical scheme:

[0007] A cross-seasonal geothermal energy storage and recycling system, comprising a geothermal energy storage and heat exchange system, a heat pump system, a switching pipe network and an electric boiler heat storage system; the geothermal energy storage and heat exchange system is used for heat exchange with geothermal energy, the heat pump system is connected with the geothermal energy storage and heat exchange system, and the heat pump system is used for heat exchange with the heat-using building;

[0008] The electric boiler heat storage system comprises a boiler heating assembly, a heat storage assembly and a heat release assembly; the boiler heating assembly and the heat storage assembly are connected, the heat storage assembly is used for heat storage; the heat release assembly is respectively connected with the heat storage assembly and the boiler heating assembly; the heat release assembly exchanges heat with the switching pipe network, and the switching pipe network respectively controls heat exchange with the ground energy storage heat exchange system or the heat-using building.

[0009] By using the above technical scheme, in the heating season, when the heat-using amount of the heat-using building is not high, the ground energy storage heat exchange system absorbs heat from the ground, transmits the heat to the heat pump system, and the heat pump system supplies heat to the heat-using building. When the heat-using amount of the heat-using building is high, in the night valley electricity price period, the boiler heating assembly is started, and the heat generated by the boiler heating assembly is partly transmitted to the heat storage assembly for storage, and the other part of the heat is transmitted to the heat release assembly, and the heat release assembly supplies heat to the heat-using building through the switching pipe network. In the day peak electricity price period, the heat storage assembly transmits heat to the heat release pipe network, the heat release pipe network supplies heat to the heat-using building, and at the same time, the ground energy storage heat exchange system and the heat pump system supply heat in the ground to the heat-using building. When the heat-using amount of the heat-using building is higher, the boiler heating assembly is started again, and at this time, the boiler heating assembly, the heat storage assembly and the ground energy storage heat exchange system supply heat to the heat-using building at the same time to meet the heat-using demand of the heat-using building.

[0010] In the non-heating season and the transition season, in the night valley electricity price period, the boiler heating assembly generates heat, transmits part of the heat to the heat storage assembly for heat storage, and transmits the other part of the heat to the heat release assembly, and the heat release assembly transmits heat to the ground energy storage heat exchange system through the switching pipe network, and stores heat in the ground. In the day peak electricity price period, the heat storage assembly transmits heat to the heat release assembly, and the heat release assembly transmits heat to the ground energy storage heat exchange system through the switching pipe network, so as to store heat in the ground.

[0011] The application takes the ground energy storage heat exchange system as the main heat source to realize heating in the heating season, and takes the electric boiler heat storage system as the auxiliary heat source to realize peak shaving. In the non-heating season and the transition season, the electric boiler heat storage system stores heat in the ground, recovers and supplements the heat of the ground, and realizes the annual balance of the soil heat.

[0012] Optionally, the ground energy storage heat exchange system comprises a heat exchange circulation pipeline, a buried pipe heat exchanger and a geothermal circulation pump, the buried pipe heat exchanger is buried in the ground, the heat exchange circulation pipeline is respectively communicated with the heat pump system and the buried pipe heat exchanger; 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 pipe heat exchanger.

[0013] By adopting the technical scheme, the ground heat circulation pump is started, so that the fluid medium in the heat exchange circulation pipeline circulates between the heat pump system and the buried pipe heat exchanger, the buried pipe heat exchanger absorbs the heat in the rock-soil, and the heat in the rock-soil is transmitted to the heat pump system, thereby realizing the utilization of the heat in the rock-soil.

[0014] Optionally, the heat pump system comprises a ground source heat pump main machine, a heat supply circulation pipeline and a terminal circulation pump, the ground source heat pump main machine is communicated with the heat exchange circulation pipeline; the heat supply circulation pipeline is respectively communicated with the ground source heat pump main machine and the heat-using building; the terminal circulation pump is arranged on the heat supply circulation pipeline, and the terminal circulation pump enables the fluid medium in the heat supply circulation pipeline to circulate between the ground source heat pump main machine and the heat-using building.

[0015] By adopting the technical scheme, the ground source heat pump main machine transmits the heat in the heat exchange circulation pipeline to the heat supply circulation pipeline, the terminal circulation pump is started, so that the fluid medium in the heat supply circulation pipeline circulates between the ground source heat pump main machine and the heat-using building, thereby transmitting the heat to the heat-using building.

[0016] Optionally, the boiler heating assembly comprises an electrode boiler, a boiler circulation pump, a boiler circulation pipeline and a boiler plate heat exchanger; the boiler circulation pipeline is respectively communicated with the electrode boiler and the boiler plate heat exchanger, and the boiler circulation pump is arranged on the boiler circulation pipeline.

[0017] The heat storage assembly comprises a heat storage water tank, a heat storage circulation pipeline and a heat storage circulation pump; the heat storage circulation pipeline is respectively communicated with the heat storage water tank and the boiler plate heat exchanger, and the heat storage circulation pump is arranged on the heat storage circulation pipeline.

[0018] By adopting the technical scheme, the boiler heating assembly is started, the heat generated by the boiler heating assembly is transmitted to the heat storage circulation pipeline through the boiler plate heat exchanger, and the heat storage circulation pump enables the fluid medium in the circulation pipeline to circulate, thereby storing a part of the heat in the heat storage water tank.

[0019] Optionally, the heat release assembly comprises 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 communicated with 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 communicated with the terminal plate heat exchanger.

[0020] 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 to be communicated with the heat release circulation pipeline through the switch valve group; 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.

[0021] By adopting the technical scheme, the heat storage water tank is communicated with the heat release circulation pipeline or the boiler plate heat exchanger is communicated with the heat release circulation pipeline through the switch valve group control, so that the boiler heating assembly is directly controlled to supply heat or the heat storage assembly is controlled to supply heat.

[0022] Optionally, the switch pipe network comprises an end heat supply pipeline, an end heat storage pipeline, a heat supply valve group and a heat storage valve group; the end heat supply pipeline is communicated with the heat supply circulation pipeline and the end plate heat exchanger respectively; the heat supply valve group is arranged on the end heat supply pipeline; the heat supply valve group controls the communication between the end plate heat exchanger and the heat supply circulation pipeline.

[0023] The end heat storage pipeline is communicated with the end heat supply pipeline and the heat exchange circulation pipeline respectively; the heat storage valve group is arranged on the end heat storage pipeline; and the heat storage valve group controls the communication between the heat exchange circulation pipeline and the end plate heat exchanger.

[0024] By adopting the technical scheme, when the heat supply valve group is opened and the heat storage valve group is closed, the heat release circulation pipeline transmits heat to the end heat supply pipeline through the end plate heat exchanger, and the end heat supply pipeline supplies heat to the heat consumption building through the heat supply circulation pipeline. When the heat supply valve group is closed and the heat storage valve group is opened, the heat release circulation pipeline transmits heat to the end heat storage pipeline through the end plate heat exchanger, and the end heat storage pipeline transmits heat to the pipe buried heat exchanger through the heat exchange circulation pipeline, and the pipe buried heat exchanger stores heat in the rock-soil.

[0025] Optionally, the pipe buried heat exchanger comprises an outer pipe, an inner pipe, a heat exchange sleeve pipe, a return pipe, a heat conduction circulation assembly and a bottom heat exchange assembly; the inner pipe is arranged in the outer pipe; the bottom end of the inner pipe is communicated with the bottom end of the outer pipe; the heat exchange sleeve pipe is sleeved outside the inner pipe; the bottom heat exchange assembly is arranged at the bottom end of the outer pipe; and the bottom heat exchange assembly exchanges heat with the rock-soil.

[0026] The return pipe is communicated with the top end of the heat exchange sleeve pipe and the bottom heat exchange assembly respectively; the heat conduction circulation assembly is arranged between the outer pipe and the bottom heat exchange assembly; the heat exchange sleeve pipe is filled with heat conduction oil; and the heat conduction circulation assembly makes the heat conduction oil flow circularly between the heat exchange sleeve pipe, the return pipe and the bottom heat exchange assembly.

[0027] By adopting the technical scheme, the fluid medium flows downward from the top end of the outer pipe and then is discharged from the inner pipe, and the fluid medium absorbs heat in the rock-soil when flowing in the outer pipe. The bottom heat exchange assembly absorbs heat in the rock-soil, the heat conduction circulation assembly makes the heat conduction oil flow circularly between the heat exchange sleeve pipe, the return pipe and the bottom heat exchange assembly, so that the heat conduction oil transmits heat in the rock-soil to the heat exchange sleeve pipe, and the heat exchange sleeve pipe transmits heat to the fluid medium in the outer pipe and the inner pipe respectively, thereby improving the heat exchange efficiency of the pipe buried heat exchanger.

[0028] Optionally, the heat-conducting circulating assembly comprises a mounting shell, a circulating vane, a support ring seat and a spoiler vane; the mounting shell is connected with the bottom end of the inner tube, the circulating vane is rotationally connected in the mounting shell, the support ring seat is rotationally connected with the heat exchange sleeve, the support ring seat is connected with the circulating vane, and the spoiler vane is connected with the support ring seat.

[0029] When the fluid medium flows from the top end to the bottom end of the outer tube, the spoiler vane is driven to rotate, the spoiler vane drives the support ring seat to rotate through the support ring seat, and the circulating vane drives the heat-conducting oil in the bottom end heat exchange assembly to flow into the heat exchange sleeve.

[0030] By adopting the above technical scheme, when the fluid medium flows from the top end to the bottom end of the outer tube, the fluid medium drives the spoiler vane to rotate, the spoiler vane drives the support ring seat to rotate, the support ring seat drives the circulating vane to rotate, and the circulating vane drives the heat-conducting oil in the bottom end heat exchange assembly to flow into the heat exchange sleeve, so that the heat absorbed by the bottom end heat exchange assembly can be transmitted to the heat exchange sleeve, and the heat exchange sleeve can transmit the heat to the fluid media in the outer tube and the inner tube, respectively, thereby improving the heat exchange efficiency.

[0031] Optionally, the heat exchange sleeve is connected with a first heat exchange net.

[0032] By adopting the above technical scheme, when the heat-conducting oil flows in the heat exchange sleeve, the first heat exchange net can absorb part of the heat, thereby facilitating the transmission of the heat to the fluid media in the outer tube and the inner tube, respectively, and improving the heat exchange efficiency.

[0033] Optionally, the bottom end heat exchange assembly comprises a bottom shell, a spiral guide vane, a second heat exchange net, a heat absorption column and a heat absorption ring plate; the bottom shell is connected with the bottom end of the outer tube, the heat absorption ring plate is sleeved on the side of the bottom shell, and the heat absorption column is connected with the bottom end of the bottom shell; the spiral guide vane is connected inside the bottom shell, the second heat exchange net is connected inside the bottom shell, and the return pipe extends into the bottom end of the bottom shell through the spiral guide vane.

[0034] By adopting the above technical scheme, the heat absorption column and the heat absorption ring plate transmit the heat of the rock-soil to the second heat exchange net, the heat-conducting oil enters the return pipe through the heat exchange sleeve, the return pipe makes the heat-conducting oil enter the inner bottom end of the bottom shell, the heat-conducting oil flows along the spiral guide vane, so that the heat-conducting oil contacts the second heat exchange net more fully, which is conducive to absorbing the heat of the second heat exchange net, and the heat exchange efficiency can be improved.

[0035] In summary, the present application has at least one of the following beneficial effects:

[0036] 1. The application uses the geotechnical energy storage heat exchange system as the main heat source to realize heating in the heating season, and uses the electric boiler heat storage system as the auxiliary heat source to realize peak shaving. For non-heating season and transition season, the electric boiler heat storage system stores heat in the geotechnical, recovers and supplements the heat of the geotechnical, and realizes the annual balance of soil heat;

[0037] 2. Through the control of the switch valve group, the heat storage water tank can be connected with the heat release circulation pipeline, or the boiler plate heat exchanger can be connected with the heat release circulation pipeline, so that the boiler heating assembly can be directly controlled to heat, or the heat storage assembly can be controlled to heat;

[0038] 3. The bottom heat exchange assembly absorbs the heat of the geotechnical, the heat conduction circulation assembly makes the heat conduction oil circulate between the heat exchange sleeve pipe, the return pipe and the bottom heat exchange assembly, so that the heat conduction oil transfers the heat in the geotechnical to the heat exchange sleeve pipe, and the heat exchange sleeve pipe respectively transfers heat to the fluid medium in the outer pipe and the inner pipe, thereby improving the heat exchange efficiency of the buried pipe heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the overall structure schematic diagram of the cross-season geotechnical energy storage recycling system of the embodiment 1 of the application;

[0040] Figure 2 is the structure schematic diagram of the geotechnical energy storage heat exchange system, the heat pump system and the heat exchange pipe network of the embodiment 1 of the application;

[0041] Figure 3 is the structure schematic diagram of the electric boiler heat storage system of the embodiment 1 of the application;

[0042] Figure 4 is the structure schematic diagram of the buried pipe heat exchanger of the embodiment 2 of the application;

[0043] Figure 5 is Figure 4 the local structure schematic diagram after removing the first heat exchange network and the second heat exchange network in the embodiment 2 of the application.

[0044] Explanation of reference signs: 1, rock-soil energy storage heat exchange system; 11, heat exchange circulation pipeline; 12, buried pipe heat exchanger; 121, outer pipe; 122, inner pipe; 123, communication pipe; 124, heat exchange sleeve pipe; 125, first heat exchange net; 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 net; 1284, heat absorption column; 1285, heat absorption ring plate; 13, geothermal circulation pump; 2, heat pump system; 21, ground source heat pump main machine; 22, heat supply circulation pipeline; 23, end circulation pump; 3, switching pipe network; 31, end heat supply pipeline; 32, end heat storage pipeline; 4, electric boiler heat storage system; 41, boiler heating assembly; 411, electrode boiler; 412, boiler circulation pump; 413, boiler circulation pipeline; 414, boiler plate heat exchanger; 42, heat storage assembly; 421, heat storage water tank; 422, heat storage circulation pipeline; 423, heat storage circulation pump; 43, heat release assembly; 431, heat release circulation pipeline; 432, heat release circulation pump; 433, end plate heat exchanger; 100, heat-using building. DETAILED DESCRIPTION

[0045] The following Figures 1 to 5 The present application is further described in detail.

[0046] Example 1

[0047] The present application provides a cross-season rock-soil energy storage recycling system.

[0048] Reference Figure 1 and Figure 2 A cross-season rock-soil energy storage recycling system includes a rock-soil energy storage 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 heat exchange system 1 is connected to the heat pump system 2, the heat pump system 2 is connected to the heat-using building 100, and the heat in the rock-soil is transferred to the heat-using building 100 through the rock-soil energy storage heat exchange system 1 and the heat pump system 2. The electric boiler heat storage system 4 is in communication with the switching pipe network 3, and the electric boiler heat storage system 4 transfers heat to the heat-using building 100 through the switching pipe network 3, or the electric boiler heat storage system 4 transfers heat to the rock-soil energy storage heat exchange system 1 through the switching pipe network 3, and the rock-soil energy storage heat exchange system 1 stores heat in the rock-soil.

[0049] Reference Figure 1 and Figure 2, the rock-soil energy storage heat exchange system 1 includes a heat exchange circulation pipeline 11, a buried pipe heat exchanger 12, a geothermal circulation pump 13, an electrically operated on-off valve V9, an electrically operated on-off valve V10, and a heat meter R1. The buried pipe heat exchanger 12 is buried in the rock-soil, and the buried pipe heat exchanger 12 can exchange heat with the rock-soil. The heat exchange circulation pipeline 11 is in communication with the buried pipe heat exchanger 12, and the geothermal circulation pump 13 is installed on the heat exchange circulation pipeline 11, and the geothermal circulation pump 13 circulates the fluid medium in the heat exchange circulation pipeline 11.

[0050] With reference to Figure 1 and Figure 2 , the heat exchange circulation pipeline 11 has a water supply pipe and a return pipe, the electrically operated on-off valve V9 is installed on the water supply pipe of the heat exchange circulation pipeline 11, and the electrically operated on-off valve V9 can control the on-off of the water supply pipe of the heat exchange circulation pipeline 11. The electrically operated on-off valve V10 is installed on the return pipe of the heat exchange circulation pipeline 11, and the electrically operated on-off valve V10 can control the on-off of the return pipe of the heat exchange circulation pipeline 11. The heat meter R1 is installed on the water supply pipe of the heat exchange circulation pipeline 11, and the heat meter R1 detects the temperature of the fluid medium in the water supply pipe of the heat exchange circulation pipeline 11.

[0051] With reference to Figure 1 and Figure 2 , the heat pump system 2 includes a ground-source heat pump main unit 21, a heat supply circulation pipeline 22, a terminal circulation pump 23, a heat meter R2, an electrically operated on-off valve V12, and an electrically operated on-off valve V11. The heat supply circulation pipeline 22 is in communication with the ground-source heat pump main unit 21, the heat exchange circulation pipeline 11 is in communication with the ground-source heat pump main unit 21, and the ground-source heat pump main unit 21 transmits the heat in the heat exchange circulation pipeline 11 to the heat supply circulation pipeline 22. The terminal circulation pump 23 is installed on the heat supply circulation pipeline 22, and the terminal circulation pump 23 circulates the fluid medium in the heat supply circulation pipeline 22. The heat supply circulation pipeline 22 exchanges heat with the heat-using building 100, thereby supplying heat to the heat-using building 100.

[0052] With reference to Figure 1 and Figure 2 , the heat supply circulation pipeline 22 has a water supply pipe and a return pipe, the electrically operated on-off valve V12 is installed on the water supply pipe of the heat supply circulation pipeline 22, and the electrically operated on-off valve V12 controls the on-off of the water supply pipe of the heat supply circulation pipeline 22. The electrically operated on-off valve V11 is installed on the return pipe of the heat supply circulation pipeline 22, and the electrically operated on-off valve V11 controls the on-off of the return pipe of the heat supply circulation pipeline 22. The heat meter R2 is installed on the water supply pipe of the heat supply circulation pipeline 22, and the heat meter R2 detects the temperature of the fluid medium in the water supply pipe of the heat supply circulation pipeline 22.

[0053] With reference to Figure 1 and Figure 3, the electric boiler heat storage system 4 comprises a boiler heating assembly 41, a heat storage assembly 42 and a heat release assembly 43. The boiler heating assembly 41 comprises an electrode boiler 411, a boiler circulating pump 412, a boiler circulating pipeline 413 and a boiler plate heat exchanger 414. The boiler circulating pipeline 413 is in communication with the electrode boiler 411 and the boiler plate heat exchanger 414 respectively, the boiler circulating pump 412 is installed on the boiler circulating pipeline 413, and the boiler circulating pump 412 circulates the fluid medium in the boiler circulating pipeline 413 and the electrode boiler 411.

[0054] With reference to Figure 1 and Figure 3 , the heat storage assembly 42 comprises a heat storage water tank 421, a heat storage circulating pipeline 422 and a heat storage circulating pump 423. The heat storage circulating pipeline 422 is in communication with the heat storage water tank 421 and the boiler plate heat exchanger 414 respectively, and the boiler plate heat exchanger 414 transmits the heat of the boiler circulating pipeline 413 to the heat storage circulating pipeline 422. The heat storage circulating pump 423 is installed on the heat storage circulating pipeline 422, and the heat storage circulating pump 423 circulates the fluid medium in the heat storage circulating pipeline 422 and the heat storage water tank 421, and the heat storage water tank 421 can store heat.

[0055] With reference to Figure 1 and Figure 3 , the heat release assembly 43 comprises a heat release circulating pipeline 431, a heat release circulating pump 432, a terminal plate heat exchanger 433, a switch valve group and an electric regulating valve group. The heat release circulating pipeline 431 is in communication with the heat storage circulating pipeline 422 and the terminal plate heat exchanger 433 respectively, and the heat release circulating pump 432 is installed on the heat release circulating pipeline 431.

[0056] With reference to Figure 1 and Figure 3 , the switch valve group comprises an electric switch valve V1, an electric switch valve V2, an electric switch valve V3 and an electric switch valve V4. The heat storage circulating pipeline 422 has a water supply pipe and a water return pipe, the heat release circulating pipeline 431 has a water supply pipe and a water 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 circulating pipeline 422. The water supply pipe of the heat release circulating pipeline 431 is in communication with the water supply pipe of the heat storage circulating pipeline 422, and the communication position is 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 water return pipe of the heat storage circulating pipeline 422. The water return pipe of the heat release circulating pipeline 431 is in communication with the water return pipe of the heat storage circulating pipeline 422, and the communication position is between the electric switch valve V1 and the electric switch valve V2.

[0057] With reference to Figure 1 and Figure 3The electric regulating valve group comprises 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, the electric regulating valve T1 is installed on the water return pipe of the heat release circulation pipeline 431, and the electric regulating valve T1 and the electric regulating valve T2 can adjust the flow size of the heat release circulation pipeline 431.

[0058] With reference 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 transmits heat to the heat release circulation pipeline 431, that is, direct heating of the boiler heating assembly 41.

[0059] With reference 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 water tank 421 transmits heat to the heat release circulation pipeline 431.

[0060] With reference 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 assembly 41 transmits part of the heat to the heat storage water tank 421 for storage, and transmits another part of the heat to the heat release circulation pipeline 431.

[0061] With reference to Figure 1 and Figure 3 The switching pipeline network 3 comprises an end heat supply pipeline 31, a heat supply valve group, an end heat storage pipeline 32 and a heat storage valve group. The end heat supply pipeline 31 is in communication with the end plate heat exchanger 433 and the heat supply circulation pipeline 22 respectively, and the end heat storage pipeline 32 is in communication with the end heat supply pipeline 31 and the heat exchange circulation pipeline 11 respectively.

[0062] With reference to Figure 1 and Figure 3 The heat supply valve group comprises an electric switch valve V5 and an electric switch valve V6, and the heat storage valve group comprises an electric switch valve V8 and an electric switch valve V7. The end heat supply pipeline 31 has a water supply pipe and a water return pipe, the electric switch valve V5 is installed on the water return pipe of the end heat supply pipeline 31, and the electric switch valve V6 is installed on the water supply pipe of the end heat supply pipeline 31. The end heat storage pipeline 32 has a water supply pipe and a water return pipe, the electric switch valve V8 is installed on the water supply pipe of the end heat storage pipeline 32, and the electric switch valve V7 is installed on the water return pipe of the end heat storage pipeline 32.

[0063] With reference to Figure 1 and Figure 3When the electrically operated on-off valve V5 and the electrically operated on-off valve V6 are opened, the electrically operated on-off valve V8 and the electrically operated on-off valve V7 are closed, the terminal plate heat exchanger 433 transfers heat to the terminal heat supply pipeline 31, and the terminal heat supply pipeline 31 supplies heat to the heat consumption building 100 through the heat supply circulation pipeline 22. When the electrically operated on-off valve V8 and the electrically operated on-off valve V7 are opened, the electrically operated on-off valve V5 and the electrically operated on-off valve V6 are closed, the terminal plate heat exchanger 433 transfers heat to the terminal heat storage pipeline 32, and the terminal heat storage pipeline 32 transfers heat to the buried pipe heat exchanger 12 through the heat exchange circulation pipeline 11, and the buried pipe heat exchanger 12 stores heat in the rock-soil.

[0064] For the present application, it is assumed that the total heat load of the heat consumption building 100 is 5 MW, the heat consumption time is from November 1 to March 31 of the next year, the operation time is 8:00-18:00 every day for 10 hours, one 3 MW heat generating ground source heat pump host 21 is used, and the ground source heat pump host 21 makes the temperature of the water supply pipe and the return water pipe of the heat supply circulation pipeline 22 be 50℃ and 40℃ respectively.

[0065] For the heating season (winter), at the beginning and the end of heating, when the hourly load of the heat consumption building 100 is ≤3 MW, the electrically operated on-off valves V9, V10, V11 and V12 are opened, the rock-soil energy storage heat exchange system 1 and the heat pump system 2 are opened, and the heat consumption load of the heat consumption building 100 is borne, and the remaining valves and equipment are closed. When the hourly load of the heat consumption building 100 is >3 MW in the night valley electricity price period, the part of the heat consumption load exceeding 3 MW is directly supplied by the electrode boiler 411, at this time, V9, V10, V11, V12, V1, V4, V5, V6, T1 and T2 are opened, the rock-soil energy storage heat exchange system 1, the heat pump system 2, the boiler heating assembly 41 and the heat releasing assembly 43 are opened, and the remaining valves and equipment are closed. When the hourly load of the heat consumption building 100 is <3 MW in the night valley electricity price period, the electrode boiler 411 generates heat, and the heat storage water tank 421 accumulates the heat generated by the electrode boiler 411.

[0066] At the beginning and the end of heating, when the hourly load of the heat consumption building 100 is >3 MW in the day peak electricity price period, the part of the heat consumption load exceeding 3 MW is borne by the heat storage water tank 421, at this time, V9, V10, V11, V12, V5, V6, V2, V3, T1 and T2 are opened, the rock-soil energy storage heat exchange system 1, the heat pump system 2, the heat storage assembly 42 and the heat releasing assembly 43 are opened, and the remaining valves and equipment are closed.

[0067] For the heating severe cold period, when the hourly load of the building 100 is greater than 3MW, the geothermal energy storage and heat exchange system 1 is coupled with the electric boiler heat storage system 4 to run and jointly bear the heating load of the building 100. When the hourly load of the building 100 is greater than 3MW in the night valley electricity price period, the valves and equipment are opened in the same way as in the initial and final heating periods. When the hourly load of the building 100 is greater than 3MW in the day peak electricity price period, the valves and equipment are opened in the same way as in the initial and final heating periods. When the heat storage water tank 421 still cannot meet the heating load requirement in the heating severe cold period, the electric electrode boiler 411 is started synchronously to directly supply heat, at this time, V9, V10, V11, V12, V1, V2, V3, V4, V5, V6, T1 and T2 are opened, the geothermal energy storage and heat exchange system 1, the heat pump system 2, the boiler heating assembly 41, the heat storage assembly 42 and the heat release assembly 43 are opened, and the remaining valves and equipment are closed.

[0068] In the non-heating season (summer) and the transition season (spring and autumn), for the night valley electricity price period, the electric electrode boiler 411 with a heating capacity of 5MW makes the temperature of the water supply pipe and the return water pipe of the boiler circulation pipeline 413 be 90℃ and 70℃ respectively, the water supply pipe and the return water pipe of the heat storage circulation pipeline 422 are heat exchanged to 85℃ and 50℃ respectively through the boiler plate heat exchanger 414, 60% of the hot water is heat exchanged through the terminal plate heat exchanger 433, the water supply pipe and the return water pipe of the terminal heat storage pipeline 32 are heat exchanged to 50℃ and 40℃ respectively, and then reversely circulate to the buried pipe heat exchanger 12 of the geothermal energy storage and heat exchange system 1, heat is transferred to the surrounding soil through the buried pipe heat exchanger 12, heat storage is carried out through the soil, and the remaining 40% of the hot water is stored in the heat storage water tank 421, at this time, V1, V2, V3, V4, V7, V8, T1 and T2 are opened, the geothermal energy storage and heat exchange system 1 and the electric boiler heat storage system 4 are opened, and the remaining valves and equipment are closed.

[0069] In the non-heating season and the transition season, for the day peak electricity price period, the heat storage water tank 421 makes the temperature of the water supply pipe and the return water pipe of the heat release circulation pipeline 431 be 85℃ and 50℃ respectively, the water supply pipe and the return water pipe of the terminal heat storage pipeline 32 are heat exchanged through the terminal plate heat exchanger 433, and then reversely circulate to the buried pipe heat exchanger 12 of the geothermal energy storage and heat exchange system 1, heat is transferred to the surrounding soil through the buried pipe heat exchanger 12, and heat storage is carried out through the soil, at this time, the valves V2, V3, V7, V8, T1 and T2 are opened, the heat storage assembly 42, the heat release assembly 43 and the geothermal energy storage and heat exchange system 1 are opened, and the remaining valves and equipment are closed.

[0070] The present application is operated according to the model of 5 months of heating season operation-natural recovery for 1 month-supplemental heating for 2 months-natural recovery for 1 month-supplemental heating for 1 month-natural recovery for 2 months, to realize the system cross-season energy storage and energy utilization mode.

[0071] The implementation principle of the cross-season geotechnical energy storage and recycling system in the embodiment 1 is as follows: during the night valley electricity price period in the heating season, on the one hand, the geotechnical energy storage and heat exchange system 1 absorbs the heat energy in the geotechnical, 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 water tank 421 stores the heat generated by the electrode boiler 411, if the heat-using demand of the heat-using building 100 is high, the excess part is directly supplied by the electrode boiler 411. During the day peak electricity price period in 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 assembly 42 and the heat releasing assembly 43 are started to supply heat to the heat-using building 100. When the heat storage assembly 42 cannot meet the heat-using demand during the heating severe cold period, the boiler heating assembly 41 is started synchronously, so that the boiler heating assembly 41, the heat storage assembly 42 and the geotechnical energy storage and heat exchange system 1 supply heat to the heat-using building 100;

[0072] During the night valley electricity price period in the non-heating season, part of the heat generated by the boiler heating assembly 41 is stored in the heat storage assembly 42, and the other part is stored in the geotechnical through the geotechnical energy storage and heat exchange system 1. During the day peak electricity price period in the non-heating season, the heat storage assembly 42, the heat releasing assembly 43 and the geotechnical energy storage and heat exchange system 1 work to store heat in the geotechnical.

[0073] Embodiment 2

[0074] The embodiment 2 of the present application provides a cross-season geotechnical energy storage and recycling system, and the difference between the embodiment 2 and the embodiment 1 is as follows:

[0075] Reference Figure 4 and Figure 5 The buried pipe heat exchanger 12 comprises an outer pipe 121, an inner pipe 122, a communication pipe 123, a heat exchange sleeve pipe 124 and a return pipe 126. The inner pipe 122 is located in the outer pipe 121, the outer pipe 121 is coaxial with the inner pipe 122, and the bottom end of the outer pipe 121 and the inner pipe 122 are communicated through the communication pipe 123. The inner pipe 122 is communicated with the water supply pipe of the heat exchange circulating pipeline 11, the outer pipe 121 is communicated with the return pipe of the heat exchange circulating pipeline 11, the fluid medium enters the inner pipe 122 from the outer pipe 121 through the communication pipe 123, and the heat of the geotechnical is transmitted to the fluid medium in the outer pipe 121 through the outer pipe 121. The heat exchange sleeve pipe 124 is sleeved outside the inner pipe 122, the heat exchange sleeve pipe 124 is located between the outer pipe 121 and the inner pipe 122, and the communication pipe 123 penetrates through the heat exchange sleeve pipe 124. The return pipe 126 is located in the inner pipe 122, and the top end of the return pipe 126 is communicated with the top end of the heat exchange sleeve pipe 124.

[0076] Reference Figure 4 and Figure 5, the buried pipe heat exchanger 12 further comprises a heat conduction circulating assembly 127 and a bottom end heat exchange assembly 128. The bottom end heat exchange assembly 128 comprises a bottom shell 1281, a spiral guide vane 1282, a second heat exchange net 1283, a heat absorption column 1284 and a heat absorption ring plate 1285. The bottom shell 1281 is fixedly connected with the bottom end of the outer pipe 121, and the bottom end of the return pipe 126 extends into the inner bottom end of the bottom shell 1281. The heat absorption ring plate 1285 is sleeved on the side of the bottom shell 1281, the heat absorption column 1284 is fixedly connected with the bottom side of the bottom shell 1281, the spiral guide vane 1282 is fixedly connected in the bottom shell 1281, and the second heat exchange net 1283 is filled in the bottom shell 1281. The heat absorption column 1284 and the heat absorption ring plate 1285 can transmit the heat in the rock-soil to the second heat exchange net 1283.

[0077] With reference to Figure 4 and Figure 5 , the heat conduction circulating assembly 127 comprises a mounting shell 1271, a circulating vane 1272, a support ring seat 1273 and a spoiler vane 1274. The mounting shell 1271 is fixedly connected with the bottom ends of the inner pipe 122 and the outer pipe 121 respectively, and the circulating vane 1272 is rotationally connected in the mounting shell 1271. The support ring seat 1273 is rotationally connected with the heat exchange sleeve pipe 124, the support ring seat 1273 is fixedly connected with the circulating vane 1272, and the spoiler vane 1274 is fixedly connected with the support ring seat 1273.

[0078] With reference to Figure 4 and Figure 5 , the bottom shell 1281, the mounting shell 1271, the heat exchange sleeve pipe 124 and the return pipe 126 are sequentially communicated and are all filled with heat conduction oil. The support ring seat 1273 is sealed against the heat exchange sleeve pipe 124 and the outer pipe 121 respectively, so as to prevent the fluid medium in the outer pipe 121 from entering the mounting shell 1271. When the fluid medium in the outer pipe 121 flows from the top end to the bottom end, the fluid medium drives the spoiler vane 1274 to rotate, the spoiler vane 1274 drives the support ring seat 1273 to rotate, the support ring seat 1273 drives the circulating vane 1272 to rotate, and the circulating vane 1272 makes the heat conduction oil in the bottom shell 1281 enter the heat exchange sleeve pipe 124. The first heat exchange net 125 is fixedly connected in the heat exchange sleeve pipe 124, the heat conduction oil passes through the first heat exchange net 125, the first heat exchange net 125 absorbs heat, and the first heat exchange net 125 and the heat exchange sleeve pipe 124 transmit the heat to the fluid medium in the outer pipe 121 and the inner pipe 122 respectively. The heat conduction oil in the heat exchange sleeve pipe 124 enters the return pipe 126, and the return pipe 126 flows the heat conduction oil to the inner bottom end of the bottom shell 1281. The return pipe 126 is covered with heat insulation material on the outside, so as to reduce the heat exchange between the return pipe 126 and the fluid medium in the inner pipe 122.

[0079] The implementation principle of the cross-seasonal rock-soil energy storage and recycling system of the embodiment 2 is as follows: when the rock-soil energy storage and heat exchange system 1 needs to supply heat, the heat of the rock-soil is transferred to the fluid medium through the outer pipe 121, the bottom heat exchange assembly 128 absorbs the heat of the rock-soil, the heat conduction circulating assembly 127 transfers the heat of the bottom heat exchange assembly 128 to the heat exchange sleeve pipe 124, the heat exchange sleeve pipe 124 further transfers the heat to the fluid medium in the outer pipe 121 and the inner pipe 122, and the inner pipe 122 delivers the heated fluid medium to the water supply pipe of the heat exchange circulating pipeline 11. When the rock-soil energy storage and heat exchange system 1 needs to store heat in the rock-soil, the heat of the fluid medium in the outer pipe 121 is transferred to the rock-soil through the outer pipe 121, the outer pipe 121 and the inner pipe 122 transfer the heat to the heat exchange sleeve pipe 124, the heat conduction circulating assembly 127 makes the heat conduction oil transfer the heat to the bottom heat exchange assembly 128, and the bottom heat exchange assembly 128 further transfers the heat to the rock-soil.

[0080] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A cross-seasonal geotechnical energy storage and recycling system, characterized in that, It includes a soil and rock energy storage heat exchange system (1), a heat pump system (2), a switching network (3), and an electric boiler heat storage system (4); the soil and rock energy storage heat exchange system (1) is used to exchange heat with soil and rock, the heat pump system (2) is connected to the soil and rock energy storage heat exchange system (1), and the heat pump system (2) is used to exchange heat with the heat-using building (100); The electric boiler heat storage system (4) includes a boiler heating component (41), a heat storage component (42), and a heat release component (43); the boiler heating component (41) and the heat storage component (42) are connected, and the heat storage component (42) is used for heat storage; the heat release component (43) is controlled to be connected to the heat storage component (42) or the boiler heating component (41) respectively; the heat release component (43) exchanges heat with the switching network (3), and the switching network (3) is controlled to exchange heat with the geotechnical energy storage heat exchange system (1) or the heat-using building (100) respectively; The geothermal energy storage heat exchange system (1) includes a heat exchange circulation pipeline (11), a buried pipe heat exchanger (12), and a geothermal circulation pump (13); the buried pipe heat exchanger (12) is buried in the soil and rock, and the heat exchange circulation pipeline (11) is connected to the heat pump system (2) and the buried pipe heat exchanger (12) respectively; the geothermal circulation pump (13) is installed on the heat exchange circulation pipeline (11), and the geothermal circulation pump (13) makes the fluid medium in the heat exchange circulation pipeline (11) circulate between the heat pump system (2) and the buried pipe heat exchanger (12); The buried tube heat exchanger (12) includes an outer tube (121), an inner tube (122), a heat exchange sleeve (124), a return pipe (126), a heat conduction circulation assembly (127), and a bottom heat exchange assembly (128); the inner tube (122) is disposed inside 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), and the bottom heat exchange assembly (128) is disposed at the bottom end of the outer tube (121), and the bottom heat exchange assembly (128) exchanges heat with the soil and rock; The return pipe (126) is connected to the top end of the heat exchange sleeve (124) and the bottom heat exchange assembly (128) respectively. The heat conduction circulation assembly (127) is disposed between the outer pipe (121) and the bottom heat exchange assembly (128). The heat exchange sleeve (124) is filled with heat conduction oil. The heat conduction circulation assembly (127) makes the heat conduction oil circulate between the heat exchange sleeve (124), the return pipe (126) and the bottom heat exchange assembly (128).

2. The cross-seasonal geotechnical energy storage and recycling system of claim 1, wherein, The heat pump system (2) comprises a ground source heat pump host (21), a heat supply circulation pipeline (22) and a terminal circulation pump (23), the ground source heat pump host (21) is communicated with the heat exchange circulation pipeline (11); the heat supply circulation pipeline (22) is respectively communicated with the ground source heat pump host (21) and a heat using building (100); the terminal circulation pump (23) is arranged on the heat supply circulation pipeline (22), and the terminal circulation pump (23) makes the fluid medium in the heat supply circulation pipeline (22) circulate between the ground source heat pump host (21) and the heat using building (100).

3. The cross-seasonal geotechnical energy storage and recycling system of claim 2, wherein, The boiler heating assembly (41) comprises 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 communicated with 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 assembly (42) comprises a heat storage water tank (421), a heat storage circulation pipeline (422) and a heat storage circulation pump (423); the heat storage circulation pipeline (422) is respectively communicated with the heat storage water 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).

4. The cross-seasonal geotechnical energy storage and recycling system of claim 3, wherein, The heat release assembly (43) comprises 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 communicated 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 communicated 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 be communicated 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).

5. The cross-seasonal geotechnical energy storage and recycling system of claim 4, wherein, The switching pipe network (3) comprises a terminal heat supply pipeline (31), a terminal heat storage pipeline (32), a heat supply valve group and a heat storage valve group; the terminal heat supply pipeline (31) is respectively communicated with the heat supply circulation pipeline (22) and the terminal plate heat exchanger (433), the heat supply valve group is arranged on the terminal heat supply pipeline (31), and the heat supply valve group controls the communication of the terminal plate heat exchanger (433) and the heat supply circulation pipeline (22); The terminal heat storage pipeline (32) is respectively communicated with 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 communication of the heat exchange circulation pipeline (11) and the terminal plate heat exchanger (433).

6. The cross-seasonal geotechnical energy storage and recycling system of claim 1, wherein, The heat-conducting circulating assembly (127) comprises a mounting shell (1271), circulating blades (1272), a support ring seat (1273) and turbulence blades (1274); the mounting shell (1271) is connected with the bottom end of the inner tube (122), the circulating blades (1272) are rotationally connected in the mounting shell (1271), the support ring seat (1273) is rotationally connected with the heat exchange sleeve (124), the support ring seat (1273) is connected with the circulating blades (1272), and the turbulence blades (1274) are connected with the support ring seat (1273). When the fluid medium flows from the top end to the bottom end of the outer tube (121), the turbulence blades (1274) are driven to rotate, the turbulence blades (1274) drive the circulating blades (1272) to rotate through the support ring seat (1273), and the circulating blades (1272) make the heat-conducting oil in the bottom end heat exchange assembly (128) flow into the heat exchange sleeve (124).

7. The cross-seasonal geotechnical energy storage and recycling system of claim 6, wherein, The heat exchange sleeve (124) is connected with a first heat exchange net (125).

8. The cross-seasonal geotechnical energy storage and recycling system of claim 1, wherein, The bottom end heat exchange assembly (128) comprises a bottom shell (1281), spiral guide blades (1282), a second heat exchange net (1283), heat absorption columns (1284) and heat absorption ring plates (1285); the bottom shell (1281) is connected with the bottom end of the outer tube (121), the heat absorption ring plates (1285) are sleeved on the side of the bottom shell (1281), and the heat absorption columns (1284) are connected with the bottom end of the bottom shell (1281); the spiral guide blades (1282) are connected inside the bottom shell (1281), the second heat exchange net (1283) is connected inside the bottom shell (1281), and the return pipe (126) penetrates through the spiral guide blades (1282) and extends into the bottom end of the bottom shell (1281).

Images