Geothermal energy comprehensive utilization system of middle-deep geothermal well

Abstract

The utility model discloses a kind of geothermal energy comprehensive utilization systems of middle-deep geothermal well, belong to geothermal energy development and utilization technical field, including the geothermal utilization tank for preventing middle-deep geothermal well geothermal energy comprehensive utilization when liquid overflow, the top of the geothermal utilization tank is connected with geothermal liquid inlet pipe, another end of the geothermal liquid inlet pipe is connected with connecting pipe, the top of the geothermal utilization tank is installed with filter box, the side of the filter box is connected with the end of connecting pipe, two hollow columns for limiting movement guide are symmetrically installed in the vertical inner wall of the filter box, spring for providing reset ability is connected in the inside of two the hollow columns, the end of the spring is connected with moving disc, the system greatly improves the filtering efficiency of sand grain, scale in geothermal liquid, reduces harmful gas attachment residue, prevents air resistance, cavitation fault, guarantees heat exchange rate stability, reduces operation and maintenance cost and safety risk generated due to equipment maintenance, maintains system stable operation.

Description

Technical Field

[0001] This utility model belongs to the field of geothermal energy development and utilization technology, and in particular to a comprehensive geothermal energy utilization system for medium-deep geothermal wells. Background Technology

[0002] With the increasing demand for clean energy development, medium-deep geothermal energy has become an important alternative to traditional fossil energy due to its abundant reserves and strong stability. However, weak filtration capacity can lead to the presence of sand, scale, and harmful gases in the geothermal fluid, which can exacerbate equipment corrosion and wear, reduce heat exchange rate, cause gas blockage and cavitation, increase safety risks and maintenance costs, and affect the stable operation of the system.

[0003] A search revealed Chinese patent document (authorization announcement number CN223307113U), which discloses a comprehensive geothermal energy utilization system for a medium-deep geothermal well, belonging to the field of geothermal energy technology. The system includes: a heat exchange system connected to the geothermal well; a power grid connected to the heat exchange system; an air compressor connected to the power grid; a power generation device connected to both the air compressor and the power grid; and an energy storage device installed in the geothermal well, connected to both the air compressor and the power generation device. The heat exchange system can provide heating to users during winter. During the summer when the geothermal well is idle, the auxiliary power generation device can improve power generation efficiency, thus avoiding the waste of heat energy caused by the geothermal well being idle in summer. This device can meet basic usage needs; however, its weak filtration capacity leads to the residue of sand, scale, and harmful gases in the geothermal fluid, exacerbating equipment corrosion and wear, reducing heat exchange rate, causing air blockage and cavitation, increasing safety risks and maintenance costs, and affecting the stable operation of the system. Utility Model Content

[0004] The purpose of this invention is to provide a comprehensive geothermal energy utilization system for medium-deep geothermal wells to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a geothermal energy comprehensive utilization system for medium-deep geothermal wells, comprising a geothermal utilization tank for preventing liquid overflow during the comprehensive utilization of geothermal energy in medium-deep geothermal wells, wherein the top of the geothermal utilization tank is connected to a geothermal liquid inlet pipe, the other end of the geothermal liquid inlet pipe is connected to a connecting pipe, a filter box is installed on the top of the geothermal utilization tank, and one side of the filter box is connected to the end of the connecting pipe; Two hollow columns for limiting and guiding movement are symmetrically installed on the vertical inner wall of the filter box. Springs for providing reset capability are connected inside the two hollow columns. A movable disk is connected to the end of the spring. The movable disk is slidably disposed inside the hollow column. A connecting column is connected to the end of the movable disk away from the spring. A filter plate frame for support is installed at the end of the connecting column away from the movable disk. Two filter plates for contacting geothermal fluid are slidably installed inside the filter plate frame.

[0006] Preferably, two slide rails for limiting the movement are symmetrically installed on the vertical inner wall of the filter box, and the two sides of the filter plate frame are slidably disposed inside the guide column, with one of the slide rails having a guide column fixedly connected inside to limit the movement direction of the filter plate frame.

[0007] Preferably, another slide rail is internally rotatably mounted with a semi-circular cam for contacting the end of the filter plate holder, and a drive motor for rotating the semi-circular cam is mounted on its side via a coupling.

[0008] Preferably, the side of the filter box away from the connecting pipe is connected to a geothermal fluid connecting pipe for the geothermal fluid from the medium-deep geothermal well to flow into the filter box. The top of the filter box is provided with two sealing caps for easy replacement of the filter plates. The vertical inner wall of the filter box is fixedly installed with baffles to increase the contact between the geothermal fluid and the filter plates in the filter box.

[0009] Preferably, a water inlet buffer cover is installed at one end of the geothermal utilization tank, and a cold water inlet pipe is connected to the top of the water inlet buffer cover. A water outlet buffer cover is installed at the other end of the geothermal utilization tank, and a hot water outlet pipe for discharging liquid after heat exchange is connected to the bottom of the water outlet buffer cover.

[0010] Preferably, the bottom of the geothermal utilization tank is connected to a geothermal liquid outlet pipe, and the bottom of the geothermal utilization tank is fixedly equipped with support legs for supporting the geothermal utilization tank.

[0011] Preferably, the geothermal utilization tank is equipped with multiple baffles for controlling the flow direction of the geothermal fluid, multiple heat exchange pipes for external cold water to enter and exchange, the multiple heat exchange pipes completely penetrating the baffles, and two baffles symmetrically installed inside the geothermal utilization tank to prevent the geothermal fluid from mixing with external liquids.

[0012] Compared with the prior art, the technical effects and advantages of this utility model are as follows: This comprehensive geothermal energy utilization system for medium-deep geothermal wells benefits from a reciprocating filtration structure composed of filter plates, filter plate frames, and semi-circular cams. A drive motor rotates the semi-circular cams, and the springs inside the hollow column, along with the restoring force provided by the moving disc and connecting column, cause the filter plate frame to move the filter plates reciprocally along the slide rails and guide columns. Simultaneously, baffles increase the contact area between the geothermal fluid and the filter plates, significantly improving the filtration efficiency for sand and scale in the geothermal fluid and reducing the adhesion and residue of harmful gases. This prevents impurities from exacerbating corrosion and wear on equipment such as heat exchange pipes and geothermal outlet pipes within the geothermal utilization tank, prevents gas lock and cavitation failures, ensures stable heat exchange rates, reduces maintenance costs and safety risks associated with equipment repairs, and maintains stable system operation.

[0013] This comprehensive geothermal energy utilization system of a medium-deep geothermal well benefits from a heat exchange structure composed of baffles, heat exchange pipes, and baffles. This structure significantly improves heat exchange efficiency and fluid isolation. The baffles inside the geothermal utilization tank control the flow direction of the filtered geothermal fluid, ensuring its orderly flow within the tank and fully enveloping the heat exchange pipes. This increases the contact area between the geothermal fluid and the heat exchange pipes, allowing the heat from the geothermal fluid to be transferred to the cold water inside the pipes more efficiently, thus improving the heat exchange rate. Simultaneously, the baffles effectively isolate the geothermal fluid from the external cold water, preventing them from mixing and affecting heat exchange efficiency and fluid purity. This avoids equipment malfunctions caused by fluid mixing, further ensuring the stable and efficient operation of the system's heat exchange components and reducing energy waste. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This utility model Figure 2 Enlarged view of point A in the middle; Figure 5 This utility model Figure 3 Enlarged view of point B in the middle.

[0016] Explanation of reference numerals in the attached figures: In the diagram: 1. Geothermal utilization tank; 101. Inlet buffer cover; 102. Cold water inlet pipe; 103. Outlet buffer cover; 104. Hot water outlet pipe; 105. Support leg; 106. Geothermal liquid outlet pipe; 107. Geothermal liquid inlet pipe; 108. Heat exchange pipe; 109. Partition plate; 110. Baffle plate; 2. Filter box; 201. Sealing cover; 202. Geothermal liquid connection pipe; 203. Connection pipe; 204. Baffle plate; 3. Hollow column; 301. Spring; 302. Moving plate; 303. Connecting column; 304. Filter plate frame; 305. Slide rail; 306. Guide column; 307. Filter plate; 308. Semi-circular cam. Detailed Implementation

[0017] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0018] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0019] like Figures 1 to 5 The system for comprehensive utilization of geothermal energy in a medium-deep geothermal well includes a geothermal utilization tank 1 for preventing liquid overflow during comprehensive utilization of geothermal energy in the medium-deep geothermal well. The top of the geothermal utilization tank 1 is connected to a geothermal inlet pipe 107, and the other end of the geothermal inlet pipe 107 is connected to a connecting pipe 203. A filter box 2 is installed on the top of the geothermal utilization tank 1, and one side of the filter box 2 is connected to the end of the connecting pipe 203. Two hollow columns 3 are symmetrically installed on the vertical inner wall of the filter box 2 to restrict movement. Springs 301 for providing reset capability are connected inside the two hollow columns 3. A movable disk 302 is connected to the end of each spring 301 and slidably disposed inside the hollow columns 3. A connecting column 303 is connected to the end of the movable disk 302 away from the spring 301. A filter plate frame 304 for support is installed at the end of the connecting column 303 away from the movable disk 302. Two filter plates 307 for contacting the geothermal fluid are slidably installed inside the filter plate frame 304. The vertical inner wall of the filter box 2 is symmetrically equipped with two hollow columns 307 for restricting movement. The slide rail 305 guides the movement, and the filter plate frame 304 is slidably disposed inside the guide column 306 on both sides. The guide column 306 for limiting the movement direction of the filter plate frame 304 is fixedly connected inside one of the slide rails 305, and the semi-circular cam 308 for contacting the end of the filter plate frame 304 is rotatably installed inside the other slide rail 305. The side of the semi-circular cam 308 is equipped with a drive motor for driving the semi-circular cam 308 to rotate through a coupling. The medium-deep geothermal liquid enters the filter box 2 through the geothermal liquid connecting pipe 202. The baffle 204 can change the flow direction of the geothermal liquid and increase its contact area with the filter plate 307. The drive motor rotates the semi-circular cam 308, which pushes the filter plate frame 304 to move along the slide rail 305 and guide column 306. Simultaneously, the spring 301 inside the hollow column 3 provides a restoring force to the filter plate frame 304 through the moving disc 302 and connecting column 303, causing the filter plate frame 304 to drive the filter plate 307 to reciprocate, thus improving filtration efficiency. The filtered geothermal liquid enters the geothermal utilization tank 1 through the connecting pipe 203 and geothermal inlet pipe 107. When the filter plate 307 needs to be replaced, simply open the sealing cover 201.

[0020] The side of the filter box 2 away from the connecting pipe 203 is connected to a geothermal fluid connecting pipe 202 for geothermal fluid from medium-deep geothermal wells to flow into the filter box 2. The top of the filter box 2 is provided with two sealing caps 201 for easy replacement of the filter plate 307. The vertical inner wall of the filter box 2 is fixedly installed with a baffle 204 for increasing the contact between the geothermal fluid in the filter box 2 and the filter plate 307.

[0021] A water inlet buffer cover 101 is installed at one end of the geothermal utilization tank 1. The top of the water inlet buffer cover 101 is connected to a cold water inlet pipe 102. A water outlet buffer cover 103 is installed at the other end of the geothermal utilization tank 1. The bottom of the water outlet buffer cover 103 is connected to a hot water outlet pipe 104 for discharging the liquid after heat exchange. External cold water enters the water inlet buffer cover 101 through the cold water inlet pipe 102, and after buffering, flows into the heat exchange pipe 108 inside the geothermal utilization tank 1. At the same time, the filtered geothermal liquid enters the geothermal utilization tank 1. The baffle 109 controls the flow direction of the geothermal liquid, so that the geothermal liquid flows in an orderly manner in the tank and fully surrounds the heat exchange pipe 108. The heat of the geothermal liquid is transferred to the cold water in the pipe through the heat exchange pipe 108. After the heat exchange is completed, the hot water is discharged through the water outlet buffer cover 103 and the hot water outlet pipe 104, and the cooled geothermal liquid is discharged through the geothermal liquid outlet pipe 106.

[0022] The bottom of the geothermal utilization tank 1 is connected to a geothermal liquid outlet pipe 106. Support legs 105 are fixedly installed at the bottom of the geothermal utilization tank 1 to support it. Multiple baffles 109 are installed inside the geothermal utilization tank 1 to control the flow direction of the geothermal liquid. Multiple heat exchange pipes 108 are installed inside the geothermal utilization tank 1 to allow external cold water to enter and exchange with the liquid. These heat exchange pipes 108 completely penetrate the baffles 109. Two baffles 110 are symmetrically installed inside the geothermal utilization tank 1 to prevent the geothermal liquid from mixing with external liquids. The support legs 105 provide stable support for the entire tank, preventing it from tipping over. The baffles 110 effectively isolate the geothermal liquid from external cold water, preventing them from mixing and affecting heat exchange efficiency and fluid purity. When the geothermal liquid flows within the filter box 2 and the geothermal utilization tank 1, the sealing structures at each connection point (such as the fit between the sealing cap 201 and the filter box 2) prevent liquid overflow, ensuring the system operates in a closed loop.

[0023] To avoid the impact of environmental factors, maintenance, materials, component compatibility, and personnel operation on the normal operation of the system, the following measures should be taken in combination with the system's structural characteristics and operational requirements: Regarding environmental impact mitigation, the focus should be on addressing the interference of high temperature, humidity, and geological impurities on the system. Given the high temperature (40-150℃) characteristics of medium-deep geothermal fluids, the outer wall insulation layer of geothermal utilization tank 1 and filter box 2 should be inspected regularly. Any damage should be repaired promptly to prevent heat loss from the tank and maintain heat exchange efficiency. For equipment corrosion issues easily caused by humid environments, anti-rust coating should be applied monthly to the surfaces of metal components such as support legs 105, geothermal inlet pipe 107, and geothermal outlet pipe 106. Special attention should be paid to the flange connections between connecting pipe 203 and filter box 2 and geothermal inlet pipe 107, ensuring that the gaskets (such as the seals below the sealing cover 201) are intact to prevent humid air from seeping in and causing component corrosion. Meanwhile, a pre-filter (optional 80-mesh stainless steel mesh) is added at the inlet of the geothermal fluid connection pipe 202 to intercept large rock fragments in advance, reduce the filtration pressure of the filter plate 307 in the filter box 2, and prevent excessive external geological impurities from entering the system and causing blockage. Maintenance and upkeep should be carried out according to established procedures to ensure the continuous and stable operation of all components. For the filtration system, every two weeks, open the sealing cover 201, remove the filter plate 307 from the filter plate holder 304, and rinse the surface with high-pressure water (pressure 3-5MPa) to remove sand and scale. If the filter plate 307 is damaged or the pores are blocked by more than 30%, replace it with a new plate in time. Check the elasticity of the spring 301 in the hollow column 3 every month. If the sliding resistance of the moving disc 302 increases or the spring 301 is deformed, replace it with a spring of the same specification to ensure the reciprocating motion capability of the filter plate holder 304. Regarding the heat exchange components, the heat exchange pipes 108 inside the geothermal utilization tank 1 are cleaned quarterly. Citric acid cleaning solution (concentration 5%-8%) is injected through the cold water inlet pipe 102, and after soaking for 2-3 hours, it is rinsed with clean water to remove scale from the inner wall of the pipes and prevent a reduction in heat exchange area. The connection and sealing between the baffle 109 and the inner wall of the geothermal utilization tank 1 are checked regularly. If gaps are found, they are filled with high-temperature resistant sealant to prevent short-circuiting of the geothermal fluid and affecting the heat exchange effect. In addition, the drive motor (which drives the semi-circular cam 308 to rotate) is lubricated and maintained monthly. High-temperature grease is added, and the motor terminals are checked for looseness to prevent motor failure from causing the filter structure to stop operating. Material selection and compatibility must match the characteristics of the geothermal environment to prevent operational problems caused by material failure. The geothermal utilization tank 1 and filter box 2 should preferably be made of duplex stainless steel 2205, whose corrosion resistance and high-temperature resistance are suitable for the sulfide and chloride ion corrosion in the geothermal fluid, preventing perforation and leakage in the tank or box. The heat exchange pipe 108 uses copper-nickel alloy BFe30-1-1 to enhance the pipe's thermal conductivity and erosion resistance, preventing thinning of the pipe wall after long-term use. The spring 301 is made of high-temperature alloy spring steel to ensure stable elasticity at the operating temperature inside the filter box 2, preventing filter plate holder 304 from jamming due to high-temperature failure. Meanwhile, strict control is exercised over dimensional accuracy during component procurement. For example, the fit clearance between the filter plate holder 304 and the slide rail 305 and guide column 306 must be controlled within 0.1-0.2mm, and the surface roughness of the contact surface between the semi-circular cam 308 and the end of the filter plate holder 304 must reach Ra0.8μm or less to prevent component jamming due to dimensional deviations, which would affect the reciprocating motion efficiency of the filter structure. The precision of component fitting requires installation calibration and regular inspection and maintenance to ensure the coordinated operation of the system. During installation, ensure that the coaxiality deviation between the geothermal inlet pipe 107, connecting pipe 203, and filter box 2 does not exceed 0.5mm to avoid air lock caused by increased flow resistance of geothermal liquid due to pipe misalignment. When fixing the geothermal utilization tank 1, calibrate the tank level with a level to ensure that the support legs 105 are evenly stressed, preventing the tank from tilting and causing uneven stress on the internal baffle 109 and heat exchange pipe 108, which could lead to breakage. During operation, check the fit between the baffle 110 and the inner wall of the geothermal utilization tank 1 monthly. If gaps occur due to thermal expansion and contraction, adjust the fixing bolts of the baffle 110 to ensure effective isolation of geothermal liquid from external cold water and prevent fluid mixing. Check the coaxiality of the rotating shaft of the semi-circular cam 308 quarterly. If the deviation exceeds 0.1mm, adjust it with a coupling to ensure that the cam can stably push the filter plate frame 304 when rotating, avoiding a decrease in filtration efficiency due to component fitting deviations. Personnel operating procedures must clearly define processes and standards to avoid human error affecting system operation. Operators must undergo professional training and be familiar with the functions and operating procedures of each system component. Before starting the system, check the valve status of the geothermal fluid connection pipe 202, confirm that the filter plate 307 in the filter box 2 is installed in place and the sealing cover 201 is tightly closed, and then slowly open the valve to allow the geothermal fluid to enter the filter box 2 smoothly, preventing fluid impact from causing the filter plate holder 304 to shift. During operation, monitor the inlet and outlet temperature and pressure data of the geothermal utilization tank 1 in real time. If the temperature of the geothermal outlet pipe 106 is found to rise abnormally (more than 5°C above the set value) or the pressure fluctuation exceeds ±0.2MPa, immediately stop the machine for inspection to check for blockage of the filter plate 307 or leakage of the heat exchange pipe 108. When shutting down for maintenance, the inlet and outlet valves of the geothermal fluid and cold water must be closed first. After the system pressure drops to atmospheric pressure and the temperature drops below 50°C, operations such as replacing the filter plate 307 and cleaning the heat exchange pipe 108 can be carried out to avoid safety accidents and component damage caused by operation in a high-temperature and high-pressure environment. Through multi-dimensional safeguards, the impact of various factors on the system can be effectively mitigated, ensuring its long-term stable and efficient operation.

[0024] For emergency response, a pressure safety valve (set to 1.2 times the system's rated pressure) is installed on the top of geothermal utilization tank 1. When the pressure exceeds the limit due to a sudden increase in geothermal liquid flow or blockage of heat exchange pipe 108, the safety valve automatically releases pressure to prevent the tank from bursting. An emergency drain valve is installed at the bottom of filter box 2. If a sudden and severe blockage of filter plate 307 causes a rapid rise in the liquid level inside the box, the drain valve can be opened to temporarily drain the geothermal liquid to an emergency storage tank to prevent liquid overflow and potential safety accidents. Simultaneously, a backup power module is added next to the drive motor. When the main power supply is interrupted, the backup power can maintain motor operation for 30 minutes, ensuring temporary operation of the filtration structure and preventing unfiltered geothermal liquid from directly entering geothermal utilization tank 1. In terms of energy consumption optimization, the drive motor adopts frequency conversion control. Based on the flow data detected by the flow sensor (a newly added component with an accuracy of ±2%) at the geothermal liquid connection pipe 202, the motor speed is automatically adjusted: when the geothermal liquid flow is low, the speed is reduced to reduce energy consumption; when the flow increases, the speed is increased to ensure filtration efficiency, which can reduce motor energy consumption by 15%-20%. In addition, a temperature sensor is installed at the hot water outlet pipe 104. When the water temperature reaches the set value (e.g., 50℃), the valve opening of the cold water inlet pipe 102 is automatically adjusted to reduce heat waste caused by excessive cold water inflow. A waste heat recovery pipe (made of 316L stainless steel) is added between the geothermal liquid outlet pipe 106 and the geothermal liquid connection pipe 202. The waste heat of the cooled geothermal liquid is used to preheat the geothermal liquid entering the filter box 2, reducing the system heating energy consumption and further improving energy utilization, making the system more economical and environmentally friendly on the basis of stable operation.

[0025] Working principle In this comprehensive geothermal energy utilization system for medium-deep geothermal wells, the medium-deep geothermal fluid first enters the filter box 2 through the geothermal fluid connecting pipe 202. The baffle 204 inside the filter box 2 changes the flow direction of the geothermal fluid, increasing its contact area with the filter plate 307. The drive motor drives the semi-circular cam 308 to rotate, pushing the filter plate frame 304 to move along the slide rail 305 and the guide column 306. At the same time, the spring 301 inside the hollow column 3 provides a restoring force to the filter plate frame 304 through the moving plate 302 and the connecting column 303, causing the filter plate frame 304 to drive the filter plate 307 to reciprocate, thereby improving the filtration efficiency. The filtered geothermal fluid enters the geothermal utilization tank 1 through the connecting pipe 203 and the geothermal inlet pipe 107. When replacing the filter plate 307, the sealing cover 201 can be opened for operation. Next, the heat exchange stage begins. External cold water enters the inlet buffer cover 101 through the cold water inlet pipe 102, and after buffering, flows into the heat exchange pipe 108 inside the geothermal utilization tank 1. Simultaneously, the filtered geothermal liquid enters the geothermal utilization tank 1. The baffle 109 inside the tank controls the flow direction of the geothermal liquid, ensuring its orderly flow and fully enveloping the heat exchange pipe 108. The heat from the geothermal liquid is transferred to the cold water inside the pipe through the heat exchange pipe 108. After the heat exchange is completed, the hot water is discharged through the outlet buffer cover 103 and the hot water outlet pipe 104, while the cooled geothermal liquid is discharged through the geothermal liquid outlet pipe 106. During this process, the system's protective and auxiliary structures function simultaneously. The support legs 105 at the bottom of the geothermal utilization tank 1 provide stable support for the tank body, preventing it from tipping over. The baffle 110 inside the tank isolates the geothermal liquid from the external cold water, preventing mixing that could affect the heat exchange effect and fluid purity. Furthermore, the sealing structures at various connection points, such as the sealing cover 201 of the filter box 2, effectively prevent liquid overflow, ensuring the entire system operates in a closed and efficient manner.

[0026] It should be noted that in this article, relational terms such as one and two are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A geothermal energy comprehensive utilization system for medium-deep geothermal wells, comprising a geothermal utilization tank (1) for preventing liquid overflow during the comprehensive utilization of geothermal energy from medium-deep geothermal wells, characterized in that: The top of the geothermal utilization tank (1) is connected to a geothermal liquid inlet pipe (107), and the other end of the geothermal liquid inlet pipe (107) is connected to a connecting pipe (203). A filter box (2) is installed on the top of the geothermal utilization tank (1), and one side of the filter box (2) is connected to the end of the connecting pipe (203). Two hollow columns (3) for limiting movement guidance are symmetrically installed on the vertical inner wall of the filter box (2). Springs (301) for providing reset capability are connected inside the two hollow columns (3). A movable disk (302) is connected to the end of the spring (301). The movable disk (302) is slidably disposed inside the hollow column (3). A connecting column (303) is connected to the end of the movable disk (302) away from the spring (301). A filter plate frame (304) for support is installed at the end of the connecting column (303) away from the movable disk (302). Two filter plates (307) for contacting geothermal fluid are slidably installed inside the filter plate frame (304).

2. The geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 1, characterized in that: The filter box (2) has two slide rails (305) symmetrically installed on its vertical inner wall to restrict the movement of the filter plate frame (304). The two sides of the filter plate frame (304) are slidably disposed inside the guide post (306). One of the slide rails (305) is fixedly connected to the guide post (306) to restrict the movement direction of the filter plate frame (304).

3. The geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 2, characterized in that: Another slide rail (305) is internally rotatably mounted with a semi-circular cam (308) for contacting the end of the filter plate holder (304), and the side of the semi-circular cam (308) is mounted with a drive motor for rotating the semi-circular cam (308) via a coupling.

4. The geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 1, characterized in that: The filter box (2) is connected to a geothermal fluid connecting pipe (202) on the side away from the connecting pipe (203) for geothermal fluid from medium-deep geothermal wells to flow into the filter box (2). The top of the filter box (2) is provided with two sealing caps (201) for easy replacement of filter plates (307). The vertical inner wall of the filter box (2) is fixedly installed with baffles (204) to increase the contact between the geothermal fluid in the filter box (2) and the filter plates (307).

5. A geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 1, characterized in that: One end of the geothermal utilization tank (1) is equipped with a water inlet buffer cover (101), the top of the water inlet buffer cover (101) is connected to a cold water inlet pipe (102), the other end of the geothermal utilization tank (1) is equipped with a water outlet buffer cover (103), the bottom of the water outlet buffer cover (103) is connected to a hot water outlet pipe (104) for discharging liquid after heat exchange.

6. A geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 1, characterized in that: The bottom of the geothermal utilization tank (1) is connected to a geothermal liquid outlet pipe (106), and the bottom of the geothermal utilization tank (1) is fixedly installed with a support leg (105) for supporting the geothermal utilization tank (1).

7. A geothermal energy comprehensive utilization system for a medium-deep geothermal well according to claim 1, characterized in that: The geothermal utilization tank (1) is equipped with multiple baffles (109) for controlling the flow direction of geothermal liquid. The geothermal utilization tank (1) is also equipped with multiple heat exchange pipes (108) for external cold water to enter and exchange. The multiple heat exchange pipes (108) completely penetrate the baffles (109). The geothermal utilization tank (1) is also equipped with two baffles (110) symmetrically installed inside to prevent the geothermal liquid from mixing with external liquid.

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