Wellhead device for aquifer energy storage cold-heat exchange well

Abstract

The application relates to a well head device for a water-bearing layer energy storage cold-heat heat exchange well, relates to the technical field of groundwater resources and geothermal energy utilization, and comprises a well pipe, a deep well pump, a pump pipe, a backflow pipe, a right tee joint, a check valve, an electric tee valve and a horizontal pipe, wherein the deep well pump is arranged at the lower end in the well pipe. The pump pipe is branched into two independent branches through the right tee joint, each branch is provided with a check valve and an electric tee valve, flexible switching of pumping and recharge modes is realized, the check valve effectively prevents water backflow and cold-heat fluid mixing, ensures energy storage efficiency, the electric tee valve allows accurate control of fluid flow direction, simplifies operation, reduces the use of external pipelines and valves, and makes the structure more compact; bidirectional filtration is realized through the orientation of a rotary filter drum, two modes of pumping and recharge are adapted, and blockage of impurities flowing into the check valve and the electric tee valve during the pumping and recharge processes is effectively prevented.

Description

Technical Field

[0001] This application relates to the technical field of groundwater resources and geothermal energy utilization, and in particular to a wellhead device for aquifer energy storage and heat exchange well. Background Technology

[0002] Aquifer energy storage (ATES) is a highly efficient, large-scale seasonal energy storage technology. The system typically consists of multiple heat exchange wells, which are divided into "cold wells" and "hot wells". In summer, cold water is extracted from the cold wells for building cooling, and the warm water after heat absorption is reinjected into the hot wells for storage. In winter, hot water is extracted from the hot wells for heating, and the cooled water is reinjected into the cold wells for storage. In this system, the heat exchange wells are key equipment for the extraction and reinjection of groundwater.

[0003] However, traditional heat exchange wellhead devices have limited functionality, typically supporting only simple pumping or reinjection operations. In ATES systems, it is crucial to strictly prevent the mixing of cold and hot well water through a shared pipe network to avoid energy loss and ensure energy storage efficiency. Simultaneously, to prevent water from flowing back into the well from the pipe network due to siphoning or pressure differential, it is essential to ensure controllable flow direction during the "pumping-reinjection" mode switching process. Existing technologies rely on multiple independent valves and complex bypass systems, resulting in complex structures, large footprints, inconvenient control, and high costs. Summary of the Invention

[0004] The purpose of this application is to provide a wellhead device for aquifer energy storage cold and heat exchange well to solve the above-mentioned problems.

[0005] In the first aspect, the wellhead device for aquifer energy storage cold and heat exchange well provided in this application adopts the following technical solution: it includes a well pipe, a deep well pump, a pump pipe, a return pipe, a positive tee joint, a check valve, an electric tee valve, and a horizontal pipe. The deep well pump is placed inside the lower end of the well pipe and is connected to the first port of the positive tee joint through the pump pipe. The second and third ports of the positive tee joint are each connected to a branch pipe, and a check valve and an electric tee valve are sequentially provided on the two branch pipes. The horizontal pipe is set on the other port of the electric tee valve, and a return pipe is also provided inside the well pipe. By adopting the above technical solution, the pump pipe is divided into two independent branches through a positive three-way connector. Each branch is equipped with a check valve and an electric three-way valve, which realizes flexible switching between pumping and reinjection modes. The check valve effectively prevents backflow of water and mixing of hot and cold fluids, ensuring energy storage efficiency. The electric three-way valve allows for precise control of fluid flow direction, simplifies operation and reduces the use of external pipes and valves, making the structure more compact. Well casing is PVC / D specification, deep well pump is D specification, and pump casing is DN specification. Both the check valve and the electric three-way valve adopt the DN specification, forming a unified flow path with the pump pipe and the horizontal pipe, which reduces abrupt changes in the flow path and pressure loss, improves fluid transportation efficiency, and simplifies the maintenance and replacement process. The horizontal pipe adopts the DE specification, and multiple wellhead devices are connected in parallel through the horizontal pipe to construct a large aquifer energy storage system.

[0006] Preferably, a return pipe is connected to the spare port of the electric three-way valve, and a three-way pipe is installed at the other end of the return pipe. One of the ports of the three-way pipe is connected to the return pipe through a pipeline. By adopting the above technical solutions, the return pipe and tee pipe provide additional return paths, allowing the system to perform pressure balancing or drainage under special operating conditions, thereby enhancing the adaptability and safety of the device.

[0007] Preferably, a low-pressure balancing valve is also provided on the pipe connecting the tee pipe and the return pipe; By adopting the above technical solution, the low-pressure balancing valve can regulate the pressure in the return pipe, prevent equipment damage or abnormal fluid flow caused by excessive pressure difference, and reduce the water hammer effect during mode switching.

[0008] Preferably, the positive tee connector is provided with a V-shaped flow guide wall in the middle to guide the fluid inside the positive tee connector to the left and right ports of the positive tee connector; By adopting the above technical solution, the guide wall optimizes the flow path of fluid in the positive tee joint, reduces turbulence and resistance, improves flow splitting efficiency, and reduces energy loss.

[0009] Secondly, the wellhead device for aquifer energy storage cold and heat exchange well provided in this application adopts the following technical solution: a bidirectional filter and an exhaust valve are also provided at the connection between the pump pipe and the positive tee joint, and the exhaust valve is located at the top of the pump pipe. By adopting the above technical solutions, the bidirectional filter can filter impurities in the fluid, protect the check valve and electric three-way valve from damage, and the exhaust valve can remove gas from the pump pipe, prevent cavitation and flow instability, and ensure the normal operation of the system.

[0010] Preferably, the bidirectional filter is provided with a first interface pipe and a second interface pipe. The first interface pipe is connected to the pump pipe, and the second interface pipe is connected to the exhaust valve. A filter cartridge is installed inside the bidirectional filter, and the top of the filter cartridge is higher than the top of the first interface pipe and the second interface pipe. The top of the bidirectional filter is provided with a detachable top cover. By adopting the above technical solution, the top cover is detachable for easy cleaning or replacement of the filter cartridge, making maintenance convenient. The top of the filter cartridge is higher than the first and second interface pipes to ensure maximum filtration area and improve filtration efficiency.

[0011] Preferably, the bottom of the filter cartridge is provided with a base plate, and a connecting column is fixed in the middle of the upper surface of the base plate. The top of the connecting column is connected to the output end of the servo motor provided on the top of the top cover. The outer side of the base plate slides against the guide ball provided on the inner wall of the bottom of the bidirectional filter. By adopting the above technical solution, the servo motor can drive the filter cartridge with the inclined inlet at the top to rotate, so that the inclined inlet at the top of the filter cartridge can switch positions on the first interface pipe and the second interface pipe to achieve bidirectional filtration, adapt to both pumping and recharge modes, effectively prevent impurities from clogging during pumping and recharge, and reduce friction through guide balls to ensure smooth rotation of the filter cartridge.

[0012] In summary, this application includes at least one of the following beneficial technical effects of wellhead devices for aquifer energy storage cold and heat exchange wells: 1. The pump pipe is divided into two independent branches by a positive three-way connector. Each branch is equipped with a check valve and an electric three-way valve, which realizes flexible switching between pumping and reinjection modes. The check valve effectively prevents backflow of water and mixing of hot and cold fluids, ensuring energy storage efficiency. The electric three-way valve allows for precise control of fluid flow direction, simplifies operation and reduces the use of external pipes and valves, making the structure more compact. 2. The servo motor can drive the upper inclined inlet of the filter cartridge to rotate, so that the inclined inlet at the upper end of the filter cartridge can switch positions on the first interface pipe and the second interface pipe. By rotating the position of the filter cartridge, bidirectional filtration is achieved, which can adapt to both pumping and recharge modes. It effectively prevents impurities from flowing into the check valve and electric three-way valve and causing blockage during pumping and recharge. Furthermore, the guide ball reduces friction and ensures that the filter cartridge rotates smoothly. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a top view of the wellhead device of this application; Figure 3 This is a schematic diagram of the internal structure of the positive tee connector of this application; Figure 4 This is a three-dimensional internal structure diagram of the bidirectional filter of this application; Figure 5 This is a schematic diagram of the internal structure of the bidirectional filter in this application; Explanation of reference numerals in the attached drawings: 1. Well casing; 2. Deep well pump; 3. Pump casing; 31. Two-way filter; 311. First interface pipe; 312. Second interface pipe; 313. Filter cartridge; 3131. Base plate; 3132. Connecting column; 3133. Servo motor; 314. Top cover; 315. Guide ball; 32. Exhaust valve; 4. Return pipe; 5. Positive tee connector; 51. Guide wall; 6. Check valve; 7. Electric tee valve; 8. Horizontal pipe; 9. Return pipe; 91. Tee pipe; 92. Low-pressure balancing valve. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0015] Example 1: A wellhead device for aquifer energy storage cold and heat exchange well, referring to... Figure 1-3 The well includes a well casing 1, a deep well pump 2, a pump pipe 3, a return pipe 4, a positive tee connector 5, a check valve 6, an electric three-way valve 7, and a horizontal pipe 8. The deep well pump 2 is located inside the lower end of the well casing 1, and the deep well pump 2 is connected to the first port of the positive tee connector 5 through the pump pipe 3. The second port and the third port of the positive tee connector 5 are each connected to a branch pipe, and the two branch pipes are respectively equipped with a check valve 6 and an electric three-way valve 7. The horizontal pipe 8 is located on the other port of the electric three-way valve 7. The well casing 1 is also equipped with a return pipe 4. The pump pipe 3 is divided into two independent branches by the positive three-way connector 5. Each branch is equipped with a check valve 6 and an electric three-way valve 7, which realizes flexible switching between pumping and reinjection modes. The check valve 6 effectively prevents backflow of water and mixing of hot and cold fluids, ensuring energy storage efficiency. The electric three-way valve 7 allows precise control of fluid flow direction, simplifies operation and reduces the use of external pipes and valves, making the structure more compact. Well casing 1 is made of PVC315 / D315, deep well pump 2 is made of D184, and pump casing 3 is made of DN80. Both the check valve 6 and the electric three-way valve 7 are DN80, forming a unified flow path with the pump pipe 3 and the horizontal pipe 8, which reduces abrupt changes in the flow path and pressure loss, improves fluid delivery efficiency, and simplifies the maintenance and replacement process. The horizontal pipe 8 adopts the DE125 specification. Multiple wellhead devices are connected in parallel through the horizontal pipe 8 to construct a large aquifer energy storage system.

[0016] The spare port of the electric three-way valve 7 is connected to the return pipe 9, and the other end of the return pipe 9 is equipped with a three-way pipe 91. One of the ports of the three-way pipe 91 is connected to the return pipe 4 through a pipe. The return pipe 9 and tee 91 provide additional return paths, allowing the system to perform pressure balancing or drainage under special operating conditions, enhancing the adaptability and safety of the device.

[0017] A low-pressure balancing valve 92 is also installed on the pipe connecting the tee pipe 91 and the return pipe 4; The low-pressure balancing valve 92 can regulate the pressure in the return pipe 4 to prevent equipment damage or abnormal fluid flow due to excessive pressure difference, and reduce the water hammer effect during mode switching.

[0018] A V-shaped guide wall 51 is provided in the middle of the positive tee connector 5 to guide the fluid inside the positive tee connector 5 to the left and right ports of the positive tee connector 5. The guide wall 51 optimizes the flow path of the fluid in the positive tee joint 5, reduces turbulence and resistance, improves the flow splitting efficiency, and reduces energy loss.

[0019] The implementation principle of this application embodiment is as follows: In the pumping mode, the deep well pump 2 starts and draws groundwater from the bottom of the well pipe 1. The water enters the positive three-way connector 5 through the pump pipe 3. The guide wall 51 inside the positive three-way connector 5 guides the fluid. The electric three-way valve 7 of one branch pipe is opened, allowing the fluid to flow to the horizontal pipe 8 for external heat exchange. The electric three-way valve 7 of the other branch pipe is closed, and the check valve 6 prevents the fluid from flowing back. In the reinjection mode, the deep well pump 2 stops, and the electric three-way valve 7 is activated so that the external fluid enters the electric three-way valve 7 through the horizontal pipe 8. Then the fluid enters the pump pipe 3 through the check valve 6 and the positive three-way connector 5, and then is reinjected into the well pipe 1 through the return pipe 4.

[0020] Example 2: A wellhead device for aquifer energy storage cold and heat exchange well, referring to... Figure 4-5 The connection between the pump pipe 3 and the positive tee connector 5 is also provided with a bidirectional filter 31 and an exhaust valve 32, with the exhaust valve 32 located at the very top of the pump pipe 3. The two-way filter 31 can filter impurities in the fluid and protect the check valve 6 and the electric three-way valve 7 from damage. The exhaust valve 32 can remove gas from the pump pipe 3, prevent cavitation and flow instability, and ensure the normal operation of the system.

[0021] The bidirectional filter 31 is provided with a first interface pipe 311 and a second interface pipe 312. The first interface pipe 311 is connected to the pump pipe 3, and the second interface pipe 312 is connected to the exhaust valve 32. The filter cartridge 313 is installed inside the bidirectional filter 31, and the top of the filter cartridge 313 is higher than the top of the first interface pipe 311 and the second interface pipe 312. The top of the bidirectional filter 31 is provided with a detachable top cover 314. The top cover 314 is removable for easy cleaning or replacement of the filter cartridge 313, making maintenance convenient. The top of the filter cartridge 313 is higher than the first interface tube 311 and the second interface tube 312 to ensure maximum filtration area and improve filtration efficiency.

[0022] The bottom of the filter cartridge 313 is provided with a base plate 3131, and a connecting column 3132 is fixed in the middle of the upper end surface of the base plate 3131. The top of the connecting column 3132 is connected to the output end of the servo motor 3133 provided on the top of the top cover 314. The outer side of the base plate 3131 is in contact with and slides against the guide ball 315 provided on the inner wall of the bottom of the bidirectional filter 31. The servo motor 3133 can drive the filter cartridge 313, which has an inclined inlet at the top, to rotate. This allows the inclined inlet at the top of the filter cartridge 313 to switch positions on the first interface pipe 311 and the second interface pipe 312. During pumping, the inclined inlet at the top of the filter cartridge 313 faces the first interface pipe 311, and during refilling, the inclined inlet at the top of the filter cartridge 313 faces the second interface pipe 312. This achieves bidirectional filtration by rotating the position of the filter cartridge 313, adapting to both pumping and refilling modes. It effectively prevents impurities from flowing into the check valve 6 and the electric three-way valve 7 and causing blockages during pumping and refilling. Furthermore, multiple annular guide balls 315 distributed on the inner wall of the bottom of the bidirectional filter 31 reduce friction during the rotation of the filter cartridge 313, ensuring smooth rotation of the filter cartridge 313.

[0023] The implementation principle of this application embodiment is as follows: Based on embodiment 1, the return pipe 9 is connected to the spare interface of the electric three-way valve 7, and is connected to the return pipe 4 through the three-way pipe 91. When switching modes or performing system maintenance, when switching from pumping mode to recharge mode, the low-pressure balance valve 92 opens slowly to balance the pressure and ensure a smooth fluid transition. The pressure in the return pipe 4 is adjusted by the low-pressure balance valve 92 to prevent equipment damage or water hammer effect due to excessive pressure difference. In addition, the servo motor 3133 drives the filter cartridge 313 to rotate, causing the inclined inlet at the upper end of the filter cartridge 313 to switch positions between the first interface pipe 311 and the second interface pipe 312, thereby achieving bidirectional filtration, adapting to changes in the flow direction of pumping and recharge, and effectively preventing impurities from clogging the filter cartridge.

[0024] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wellhead device for a thermal exchange well in an aquifer energy storage system, comprising a well casing (1), a deep well pump (2), a pump casing (3), a return pipe (4), a positive tee connector (5), a check valve (6), an electric tee valve (7), and a horizontal pipe (8), characterized in that, The deep well pump (2) is placed inside the lower end of the well pipe (1), and the deep well pump (2) is connected to the first port of the positive three-way connector (5) through the pump pipe (3). The second port and the third port of the positive three-way connector (5) are each connected to a branch pipe, and a check valve (6) and an electric three-way valve (7) are installed on the two branch pipes in sequence. The horizontal pipe (8) is installed on the other port of the electric three-way valve (7). A return pipe (4) is also installed inside the well pipe (1).

2. The wellhead device for aquifer energy storage cold and heat exchange well according to claim 1, characterized in that, The spare port of the electric three-way valve (7) is connected to a return pipe (9), and the other end of the return pipe (9) is equipped with a three-way pipe (91). One port of the three-way pipe (91) is connected to the return pipe (4) through a pipe.

3. A wellhead device for aquifer energy storage cooling and heating well according to claim 2, characterized in that, A low-pressure balancing valve (92) is also installed on the pipe connecting the tee pipe (91) and the return pipe (4).

4. A wellhead device for aquifer energy storage cooling and heating well according to claim 1, characterized in that, The positive tee connector (5) is provided with a V-shaped guide wall (51) in the middle, which guides the fluid inside the positive tee connector (5) to the left and right ports of the positive tee connector (5).

5. A wellhead device for aquifer energy storage cold and heat exchange well according to claim 1, characterized in that, A bidirectional filter (31) and an exhaust valve (32) are also provided at the connection between the pump pipe (3) and the positive tee connector (5), with the exhaust valve (32) located at the top of the pump pipe (3).

6. A wellhead device for aquifer energy storage cooling and heating well according to claim 5, characterized in that, The bidirectional filter (31) is provided with a first interface pipe (311) and a second interface pipe (312). The first interface pipe (311) is connected to the pump pipe (3), and the second interface pipe (312) is connected to the exhaust valve (32). The filter cartridge (313) is installed inside the bidirectional filter (31), and the top of the filter cartridge (313) is higher than the top of the first interface pipe (311) and the second interface pipe (312). The top of the bidirectional filter (31) is provided with a detachable top cover (314).

7. A wellhead device for aquifer energy storage cold and heat exchange well according to claim 6, characterized in that, The filter cartridge (313) is provided with a base plate (3131) at the bottom, and a connecting column (3132) is fixed in the middle of the upper end face of the base plate (3131). The top of the connecting column (3132) is connected to the output end of the servo motor (3133) provided on the top cover (314). The outer side of the base plate (3131) is in contact with and slides against the guide ball (315) provided on the inner wall of the bottom of the bidirectional filter (31).

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