Geothermal recharge equipment and method with impurity removal function

Abstract

The invention relates to the technical field of filtering equipment, and discloses terrestrial heat recharging equipment with an impurity removal function and a method thereof.The terrestrial heat recharging equipment with the impurity removal function comprises a filtering tank, a sealing cover arranged at the top of the filtering tank, a water inlet pipe arranged on the outer side of the filtering tank and a water outlet pipe arranged on the outer side of the sealing cover; the filter cartridge is arranged at the bottom of the sealing cover. According to the geothermal recharging equipment and method with the impurity removal function, by arranging the cleaning assembly, during impurity removal, high-pressure water flow enters a backwashing space along a connecting pipe, the water penetrates through a filter cartridge from inside to outside and flushes the filter cartridge, then a screw rotates to drive a cleaning head to move up and down in the filter cartridge, the filter cartridge is flushed little by little, and the cleaning efficiency is improved. In this way, pressure is concentrated in a small area, the washing effect on the filter cartridge can be improved, the flowing path of water flow can be effectively mastered, comprehensive washing of the filter cartridge is achieved, and cleaning dead corners are avoided.

Description

Technical Field

[0001] This invention relates to the field of filtration equipment technology, and in particular to a geothermal reinjection equipment and method with impurity removal function. Background Technology

[0002] Geothermal resources, as a clean and efficient renewable energy source, are increasingly widely used in heating, power generation, medical and health care, and other fields. Geothermal reinjection is the core link in realizing the sustainable development and utilization of geothermal resources. By reinjecting the wastewater generated after geothermal utilization into the underground geothermal reservoir, it can not only replenish the geothermal water volume and maintain the geothermal reservoir pressure, but also avoid the environmental impact caused by direct discharge of wastewater. It is a key technical means to ensure the long-term stable utilization of geothermal resources.

[0003] Filtration equipment is a core component of geothermal reinjection systems. Its main function is to remove suspended solids, silt, flocculent matter, and other impurities from geothermal tailwater, preventing these impurities from clogging the pores of the reinjection well or adhering to the inner wall of the well casing, thereby ensuring the smooth flow and stability of the reinjection system. Currently, most geothermal reinjection filtration equipment on the market employs a multi-stage filtration structure combining coarse and fine filtration. The filter element, as the core of the filtration process, directly determines whether the reinjection water quality meets the requirements for geothermal reservoir injection based on its filtration accuracy and interception efficiency. Commonly used filter element types include honeycomb tubular filter elements, pleated filter elements, and ceramic filter elements, with filtration accuracies ranging from 1μm to 100μm to adapt to different impurity contents in geothermal tailwater.

[0004] However, in practical applications, existing geothermal reinjection filtration systems still have significant technical defects, limiting the operational efficiency and maintenance economy of the reinjection system. The core problem lies in the clogging and cleaning of the filter element. Geothermal tailwater contains complex impurities, especially sandstone reservoirs and tailwater with high flocculent content. These impurities readily adhere to the filter element surface and gradually embed themselves into the filter element's pore structure, causing blockage of the filtration channels. As the blockage worsens, the pressure difference between the inlet and outlet of the filtration equipment increases significantly. This not only reduces the filtration flow rate and affects reinjection efficiency but may also cause filter element damage due to excessive pressure, allowing unfiltered impurities to directly enter the reinjection well and leading to permanent blockage. Summary of the Invention

[0005] Given that existing technologies have problems with the complex composition of impurities in geothermal tailwater, especially sandstone geothermal reservoirs and geothermal tailwater containing a lot of flocculent matter, impurities can easily and quickly adhere to the surface of the filter element and gradually embed into the pore structure of the filter element, causing the filter element's filtration channels to be blocked, a geothermal reinjection device and method with impurity removal function is proposed.

[0006] This application provides a geothermal reinjection device and method with impurity removal function, the purpose of which is to clean the filter element regularly and keep the water flow smoothly.

[0007] The technical solution of the present invention is as follows: a geothermal reinjection device with impurity removal function, comprising a filter tank, a sealing cover disposed on the top of the filter tank, an inlet pipe disposed on the outside of the filter tank, an outlet pipe disposed on the outside of the sealing cover, a filter cylinder disposed on the bottom of the sealing cover, a cleaning component disposed between the outlet pipe and the filter cylinder, a drain pipe disposed on the bottom of the filter tank, and an exhaust component disposed on the top of the sealing cover. The cleaning component specifically includes a main board disposed inside the outlet pipe, an assembly groove opened on the side of the main board away from the sealing cover, an outflow hole disposed on the side of the main board close to the sealing cover, a storage chamber disposed on the inner wall of the assembly groove, a support spring disposed in the storage chamber, a baffle plate disposed inside the assembly groove, a first connecting hole through the central axis of the main board, a cleaning head disposed inside the filter cylinder, a second connecting hole opened on the top of the cleaning head, a connecting pipe disposed between the second connecting hole and the first connecting hole, and a screw disposed between the sealing cover and the filter cylinder.

[0008] The assembly groove is designed in a ring shape, and the outflow hole is connected to the assembly groove and distributed in a ring array around the assembly groove. The cleaning head is in the shape of "I" and is slidably installed in the filter cylinder. The screw is threadedly connected to the cleaning head, and a sealing cap extends from the upper end of the screw. The connecting pipe is designed in a spiral shape and is wrapped around the outside of the screw.

[0009] Furthermore, the sealing cover is divided into two parts: a cover plate and a convex tube, with the water outlet pipe connected to the middle of the convex tube.

[0010] Furthermore, the inner wall of the filter tank is provided with a lower partition plate, and an upper partition plate is provided at the bottom of the cover plate, with a flow hole on the outer side of the upper partition plate;

[0011] Both the lower and upper partition plates are annular and surround the outside of the filter cylinder. The lower and upper partition plates have the same diameter, and a flow channel is provided between them.

[0012] Furthermore, the filter cartridge specifically includes an inner liner disposed at the bottom of the cover plate and a filter membrane disposed on the outer side of the inner liner;

[0013] The length of the inner liner is greater than the length of the filter membrane, and connection ends and storage ends are reserved at both ends of the inner liner.

[0014] Furthermore, the exhaust assembly specifically includes a riser disposed on the top of the cover plate and the convex pipe, a boss disposed on the top of the riser, a connecting hole opened through the top of the cover plate and the convex pipe, an overflow port opened on the top of the boss, and a sealing bolt disposed at the top opening of the overflow port.

[0015] The lower end of the riser is connected to the docking hole, and the upper end of the riser is connected to the overflow port.

[0016] Furthermore, the exhaust assembly also includes a receiving groove and a connecting hole opened on the inner wall of the overflow port, a sealing ball disposed inside the receiving groove, a partition mesh disposed inside the overflow port, and a discharge hole opened inside the sealing bolt.

[0017] The storage slot and the connecting hole are connected. Both the storage slot and the partition are designed with an inclination. The partition is located at the opening of the storage slot. One end of the drain hole passes through the bottom of the sealing bolt and the other end passes through the side of the sealing bolt.

[0018] Furthermore, a groove that fits the outer contour of the sealing ball is provided at the lower opening of the drain hole.

[0019] Furthermore, a limiting ring is provided on the inner wall of the water outlet pipe, and a compression sleeve is inserted into the end of the water outlet pipe away from the sealing cover. The main board is located between the limiting ring and the compression sleeve.

[0020] Furthermore, the present invention also provides a geothermal reinjection method with impurity removal function, comprising the following steps:

[0021] Step 1: Collect the wastewater generated after geothermal utilization and transport it to a sedimentation tank through a collection pipeline. Use gravity to separate impurities such as particulate mud and gravel.

[0022] Step 2: The pretreated effluent is transported to the filter tank, and the filter cartridge clogging status is monitored in real time by a pressure sensor; when the pressure difference reaches 0.05MPa, the booster pump reverses the pressure and works with the cleaning components to achieve reverse water flow flushing. The backwash wastewater enters the sewage tank through the drain pipe.

[0023] Step 3: Set up an online monitoring point at the outlet of the water pipe to monitor the water quality in real time using a turbidity sensor and a particle counter.

[0024] The beneficial effects of this invention are:

[0025] 1. By setting up a cleaning component, during impurity removal, geothermal water enters the filter tank through the inlet pipe, then penetrates the filter cartridge, flows upwards towards the sealing cover inside the cartridge, and flows into the outlet pipe from the sealing cover. The water flow pushes open the baffle plate through the outflow hole and finally flows out from the outlet pipe. When the filter cartridge becomes clogged, the booster pump reverses the pressure, increasing the pressure in the outlet pipe. The support spring pulls the baffle plate back into the assembly slot, sealing the outflow hole. High-pressure water enters the connecting pipe and then flows along the connecting pipe into the backwash space. This water penetrates the filter cartridge from the inside out, rinsing it. Subsequently, the drive unit rotates the screw, causing the cleaning head to move up and down inside the filter cartridge, rinsing it little by little. This concentrates the pressure in a small area, improving the rinsing effect on the filter cartridge and effectively controlling the water flow path, achieving comprehensive rinsing of the filter cartridge and avoiding cleaning dead spots.

[0026] 2. By fixing the water outlet pipe to the middle of the convex pipe, space is reserved above the water outlet pipe so that the air bubbles that are released when the water flows through the filter can float to the top and be stored there, avoiding the air bubbles from mixing in the backflow and reducing the cavitation on the inner wall of the subsequent flow pipe.

[0027] 3. By setting up a lower and upper partition plate, the geothermal water entering the filter tank first flows upward and then downward to approach the filter cylinder. This allows air bubbles in the water to rise and distribute around the upper partition plate as the water flows through the flow channel, thus preventing air bubbles from adhering to the outside of the filter cylinder and affecting the flow of water.

[0028] 4. By installing the venting assembly, when a large number of air bubbles appear below the cover plate and inside the convex pipe, first seal the water outlet pipe, then loosen the sealing bolt inside the convex platform above the cover plate, and slowly inject water into the filter tank. The air bubbles below the cover plate will be gradually squeezed into the riser pipe by the water pressure, and then discharged from the overflow port. After the first stage of venting on the outside, reset the previously loosened sealing bolt, then loosen the sealing bolt inside the convex platform above the convex pipe, and slowly inject water into the filter tank. The air bubbles inside the convex pipe will be gradually squeezed into the riser pipe by the water pressure, and then discharged from the overflow port. Finally, reset the sealing bolt.

[0029] 5. By setting a sealing ball, when venting, first loosen the sealing bolt, and then the air bubbles will gradually rise from the riser and then be discharged from the drain hole. When the water flows to the connecting hole, it will enter the space below the sealing ball. Under the action of buoyancy, the sealing ball moves towards the overflow port until the sealing ball presses against the opening below the drain hole, sealing the drain hole. This can prevent water from overflowing from the overflow port. Attached Figure Description

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is a disassembled diagram of the present invention;

[0032] Figure 3 This is a schematic diagram of the filter cartridge of the present invention;

[0033] Figure 4 This is a schematic diagram of the sealing cap of the present invention;

[0034] Figure 5 This is a schematic diagram of the cleaning component of the present invention;

[0035] Figure 6 This is a plan view of the present invention;

[0036] Figure 7 This is a cross-sectional view of the present invention;

[0037] Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle;

[0038] Figure 9 For the present invention Figure 7 Enlarged view of the center sealing cap;

[0039] Figure 10 For the present invention Figure 9 Enlarged view at point B in the middle;

[0040] Figure 11 For the present invention Figure 9 Enlarged view of point C in the middle.

[0041] In the picture:

[0042] 1. Filter tank; 11. Lower partition plate; 12. Upper partition plate; 13. Flow hole; 2. Sealing cover; 21. Cover plate; 22. Protruding tube; 3. Inlet pipe; 4. Outlet pipe; 41. Limiting ring; 42. Compression sleeve; 5. Filter cylinder; 51. Liner; 52. Filter membrane; 6. Cleaning assembly; 61. Main board; 62. Assembly slot; 63. Outflow hole; 64. Storage chamber; 65. Support spring; 66. Baffle plate; 67. Connection hole one; 68. Cleaning head; 69. Connection hole two; 610. Connecting pipe; 611. Screw; 7. Drain pipe; 8. Exhaust assembly; 81. Riser; 82. Boss; 83. Docking hole; 84. Overflow outlet; 85. Storage slot; 86. Connecting hole; 87. Sealing ball; 88. Partition mesh; 89. Sealing bolt; 810. Drain hole. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Example 1, referring to Figures 1-10This is the first embodiment of the present invention, providing a geothermal reinjection device with impurity removal function, including a filter tank 1, a sealing cover 2 disposed on the top of the filter tank 1, a water inlet pipe 3 disposed on the outside of the filter tank 1, a water outlet pipe 4 disposed on the outside of the sealing cover 2, a filter cylinder 5 disposed at the bottom of the sealing cover 2, a cleaning component 6 disposed between the water outlet pipe 4 and the filter cylinder 5, a drain pipe 7 disposed at the bottom of the filter tank 1, and an exhaust component 8 disposed on the top of the sealing cover 2. The cleaning component 6 specifically includes a main board 61 disposed inside the water outlet pipe 4, and an exhaust component 8 disposed on the main board 61 away from the sealing cover 2. The assembly groove 62 on one side of the cover 2, the outflow hole 63 on the main board 61 near the cover 2, the storage chamber 64 on the inner wall of the assembly groove 62, the support spring 65 in the storage chamber 64, the baffle plate 66 inside the assembly groove 62, the first connection hole 67 through the main board 61 at the central axis, the cleaning head 68 inside the filter cartridge 5, the second connection hole 69 on the top of the cleaning head 68, the connecting pipe 610 between the second connection hole 69 and the first connection hole 67, and the screw 611 between the cover 2 and the filter cartridge 5.

[0045] Specifically, the sealing cover 2 is fixedly installed on the top of the filter tank 1. The inlet pipe 3 and the drain pipe 7 are both welded to the filter tank 1. The other end of the inlet pipe 3 is connected to the grit chamber via a pipe. The lower end of the drain pipe 7 is connected to the sewage tank. The outlet pipe 4 is connected to the reflux equipment and has a built-in booster pump. An online monitoring point is set at the outlet of the outlet pipe 4. The online monitoring point is equipped with a turbidity sensor, a particle counter, a thermometer, and a pH detection device. Pressure sensors are installed inside both the filter tank 1 and the sealing cover 2 to detect the pressure of the filter cartridge 5. The internal and external pressure difference is used to determine the degree of clogging of filter cartridge 5. Filter cartridge 5 is a honeycomb-type tubular filter element with a filtration accuracy set at 20-50μm. It mainly intercepts medium-sized suspended particles and flocculent precursors in the water with a particle size between 20-100μm. The assembly groove 62 has an annular design, and the outflow holes 63 are connected to the assembly groove 62 and distributed in a ring array around the assembly groove 62. The receiving chamber 64 is divided into inner and outer layers, which are distributed on the inner and outer annular walls of the assembly groove 62, respectively. One end of the supporting spring 65 One end is connected to the barrier plate 66, and the other end is connected to the inner wall of the storage chamber 64. The barrier plate 66 is slidably installed in the assembly groove 62. The cleaning head 68 is I-shaped and consists of two piston plates and a threaded tube. A backwashing space is formed between the two piston plates. The threaded tube is sleeved on the outside of the screw 611. A sealed bearing is installed between the screw 611 and the sealing cover 2 to reduce friction between the two and prevent water leakage. The rotation of the screw 611 controls the cleaning head 68 to move at a speed of 5mm / s. The cleaning head 68 is slidably installed inside the filter cartridge 5. The screw 611 is threadedly connected to the cleaning head 68. The upper end of the screw 611 extends out to the sealing cover 2 and is connected to the drive device. The connecting pipe 610 has a spiral design and wraps around the outside of the screw 611. The spiral pitch is designed to be 40mm, which ensures the cross-sectional area of ​​the water flow channel and avoids interference with the screw 611, so as not to affect the normal flow of water. It is made of silicone rubber and has the characteristics of high temperature resistance, good flexibility, aging resistance and ozone resistance.

[0046] By setting the cleaning component 6, during impurity removal, geothermal water enters the filter tank 1 from the inlet pipe 3, then penetrates the filter cylinder 5, flows upwards to the sealing cover 2 inside the filter cylinder 5, flows into the outlet pipe 4 from the sealing cover 2, and the water flows through the outflow hole 63 to push open the baffle plate 66, and finally flows out from the outlet pipe 4. When the filter cylinder 5 is blocked, the booster pump pressurizes in reverse, the pressure in the outlet pipe 4 increases, the support spring 65 pulls the baffle plate 66 back into the assembly groove 62, and closes the outflow hole 63. The high-pressure water flows into the connecting pipe 610, and then enters the backwash space along the connecting pipe 610. This water penetrates the filter cylinder 5 from the inside to the outside, rinsing the filter cylinder 5. Then the drive device drives the screw 611 to rotate, causing the cleaning head 68 to move up and down inside the filter cylinder 5, rinsing the filter cylinder 5 little by little. In this way, the pressure is concentrated in a small area, which can improve the rinsing effect of the filter cylinder 5 and effectively control the flow path of the water, so as to achieve a comprehensive rinsing of the filter cylinder 5 and avoid cleaning dead corners.

[0047] Specifically, the sealing cover 2 is divided into two parts: cover plate 21 and convex tube 22. The cover plate 21 and convex tube 22 are integrally formed. The cover plate 21 is fixed to the filter tank 1 by bolts. The water outlet pipe 4 is fixedly connected to the middle of the convex tube 22. In this way, a space is reserved above the water outlet pipe 4 so that the air bubbles precipitated when the water flows through the filter cylinder 5 can float up and be stored here, avoiding the air bubbles from being mixed in the backflow and reducing the cavitation caused to the inner wall of the subsequent flow pipe.

[0048] The inner wall of the filter tank 1 is provided with a lower partition plate 11, an upper partition plate 12 is provided at the bottom of the cover plate 21, and a flow hole 13 is opened on the outside of the upper partition plate 12.

[0049] Specifically, the lower partition plate 11 is welded to the filter tank 1, and the upper partition plate 12 is welded to the cover plate 21. Both the lower partition plate 11 and the upper partition plate 12 are annular and surround the outside of the filter cylinder 5. The lower partition plate 11 and the upper partition plate 12 have the same diameter, and a flow channel is provided between them.

[0050] In this way, the geothermal water enters the filter tank 1 and flows upward first, then downward and close to the filter cylinder 5. This allows air bubbles in the water to float up and distribute around the upper partition plate 12 when the water flows through the flow channel. This prevents air bubbles from adhering to the outside of the filter cylinder 5 and affecting the flow of water.

[0051] The filter cartridge 5 specifically includes an inner liner 51 disposed at the bottom of the cover plate 21 and a filter membrane 52 disposed on the outside of the inner liner 51.

[0052] Specifically, the inner liner 51 is snapped onto the bottom of the cover plate 21, and the area of ​​the inner liner 51 wrapped by the filter membrane 52 is set as a mesh frame. The length of the inner liner 51 is greater than the length of the filter membrane 52, and connection ends and storage ends are reserved at both ends of the inner liner 51.

[0053] When filtering geothermal wastewater normally, the cleaning head 68 is hidden inside the storage end, so as not to block the filter cartridge 5, ensuring the filtration efficiency of the filter cartridge 5, and making the wastewater flow more smoothly after entering the filter cartridge 5.

[0054] Example 2, refer to Figures 1-11 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the exhaust assembly 8 specifically includes a riser 81 disposed on the top of the cover plate 21 and the convex pipe 22, a boss 82 disposed on the top of the riser 81, a connecting hole 83 through the top of the cover plate 21 and the convex pipe 22, an overflow port 84 disposed on the top of the boss 82, and a sealing bolt 89 disposed at the top opening of the overflow port 84.

[0055] Specifically, the riser 81 is welded to the sealing cover 2, the boss 82 is welded to the riser 81, the lower end of the riser 81 is connected to the docking hole 83, the upper end of the riser 81 is connected to the overflow port 84, and the sealing bolt 89 is threaded into the overflow port 84.

[0056] When a large number of air bubbles appear below the cover plate 21 and inside the convex pipe 22 by setting the venting assembly 8, first seal the water outlet pipe 4, then loosen the sealing bolt 89 in the boss 82 above the cover plate 21, and slowly inject water into the filter tank 1. The air bubbles below the cover plate 21 will be gradually squeezed into the riser pipe 81 by the water pressure, and then discharged from the overflow port 84. After the first stage of venting on the outside, reset the previously loosened sealing bolt 89, then loosen the sealing bolt 89 in the boss 82 above the convex pipe 22, and slowly inject water into the filter tank 1. The air bubbles in the convex pipe 22 will be gradually squeezed into the riser pipe 81 by the water pressure, and then discharged from the overflow port 84. Finally, reset the sealing bolt 89.

[0057] The exhaust assembly 8 also includes a receiving groove 85 and a connecting hole 86 opened on the inner wall of the overflow port 84, a sealing ball 87 disposed inside the receiving groove 85, a partition 88 disposed inside the overflow port 84, and a discharge hole 810 opened inside the sealing bolt 89.

[0058] Specifically, the receiving groove 85 and the connecting hole 86 are connected. The overflow port 84, the receiving groove 85 and the connecting hole 86 are arranged in a triangle. The receiving groove 85 and the partition net 88 are both designed with an inclination. The partition net 88 is located at the opening of the receiving groove 85. The sealing ball 87 is made of rubber and can float on the water surface. One end of the drain hole 810 passes through the bottom end of the sealing bolt 89 and the other end passes through the side of the sealing bolt 89. The lower opening of the drain hole 810 has a groove that fits the outer contour of the sealing ball 87, so that the sealing ball 87 can stably seal the drain hole 810.

[0059] By setting the sealing ball 87, when venting, first loosen the sealing bolt 89, and then the air bubbles will gradually rise from the riser 81 and then be discharged from the drain hole 810. When the water flow reaches the connecting hole 86, it will enter the space below the sealing ball 87. Under the action of buoyancy, the sealing ball 87 moves towards the overflow port 84 until the sealing ball 87 presses against the opening below the drain hole 810, sealing the drain hole 810. This can prevent water from overflowing from the overflow port 84.

[0060] Specifically, a limiting ring 41 is provided on the inner wall of the water outlet pipe 4, and a clamping sleeve 42 is inserted into the end of the water outlet pipe 4 away from the sealing cover 2. The main board 61 is located between the limiting ring 41 and the clamping sleeve 42, which facilitates the installation of the cleaning component 6.

[0061] The remaining structure is the same as that in Example 1.

[0062] Example 3, referring to Figures 1-11The third embodiment of the present invention provides a geothermal reinjection method with impurity removal function, comprising the following steps:

[0063] Step 1: Collect the wastewater generated after geothermal utilization and transport it to the sedimentation tank through the collection pipeline. The residence time in the tank is set to 15 minutes. Gravity is used to separate large particles of mud, sand, gravel and other impurities with a particle size ≥100μm. The settled impurities are discharged periodically through the drain valve at the bottom of the tank.

[0064] Step 2: The pretreated effluent is transported to filter tank 1, the filtration flow rate is controlled at 0.5 m / s, the inlet and outlet pressure difference is maintained at 0.05 MPa, and the clogging status of filter cartridge 5 is monitored in real time by pressure sensor; when the pressure difference reaches 0.05 MPa, the booster pump reverses the pressure and sets the reverse booster pressure to 0.5 MPa, which works with cleaning component 6 to achieve reverse water flow flushing. The backwash wastewater enters the sewage tank through sewage pipe 7.

[0065] Step 3: Set up an online monitoring point at the outlet of water pipe 4, and monitor the water quality in real time using a turbidity sensor and a particle counter: the turbidity must be ≤5 NTU, and the content of particles with a diameter ≥5 μm must be ≤10 particles / mL. If the standards are not met, the water will be automatically returned to filter tank 1 for reprocessing. Monitor the temperature and pH value of the tailwater. If the temperature difference between the tailwater and the original water temperature of the thermal reservoir is ≥10℃, adjust the water temperature to be close to the reservoir water temperature through a heat exchanger. If the pH value deviates from the suitable range of 6.5-8.5, adjust it to the standard range by adding acid-base regulators such as hydrochloric acid or sodium hydroxide solution to avoid acid and alkali corrosion of the reinjection well or changes in the geological characteristics of the reservoir.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A geothermal reinjection device with impurity removal function, comprising a filter tank (1), a sealing cover (2) disposed on the top of the filter tank (1), an inlet pipe (3) disposed on the outside of the filter tank (1), an outlet pipe (4) disposed on the outside of the sealing cover (2), and a filter cylinder (5) disposed on the bottom of the sealing cover (2), characterized in that: A cleaning component (6) is located between the outlet pipe (4) and the filter cartridge (5), a drain pipe (7) is located at the bottom of the filter tank (1), and an exhaust component (8) is located at the top of the sealing cover (2). The cleaning component (6) specifically includes a main board (61) located inside the outlet pipe (4), an assembly groove (62) located on the side of the main board (61) away from the sealing cover (2), an outflow hole (63) located on the side of the main board (61) near the sealing cover (2), and a storage chamber (64) located on the inner wall of the assembly groove (62). 4) A support spring (65) installed in the storage chamber (64), a baffle plate (66) installed in the assembly slot (62), a connecting hole (67) that passes through the central axis of the main board (61), a cleaning head (68) installed inside the filter cartridge (5), a connecting hole (69) opened on the top of the cleaning head (68), a connecting pipe (610) installed between the connecting hole (69) and the connecting hole (67), and a screw (611) installed between the sealing cover (2) and the filter cartridge (5). The assembly groove (62) is designed in a ring shape. The outflow hole (63) is connected to the assembly groove (62) and is arranged in a ring array around the assembly groove (62). The cleaning head (68) is shaped like an "I". The cleaning head (68) is slidably installed in the filter cylinder (5). The screw (611) is threadedly connected to the cleaning head (68). The upper end of the screw (611) extends out of the sealing cap (2). The connecting pipe (610) is designed in a spiral shape and is wrapped around the outside of the screw (611).

2. The geothermal reinjection equipment with impurity removal function according to claim 1, characterized in that: The sealing cover (2) is divided into two parts: a cover plate (21) and a convex tube (22). The water outlet pipe (4) is connected to the middle of the convex tube (22).

3. The geothermal reinjection equipment with impurity removal function according to claim 2, characterized in that: The filter tank (1) has a lower partition plate (11) on its inner wall, an upper partition plate (12) at the bottom of the cover plate (21), and a flow hole (13) on the outside of the upper partition plate (12). The lower partition plate (11) and the upper partition plate (12) are both annular and surround the outside of the filter cylinder (5). The lower partition plate (11) and the upper partition plate (12) have the same diameter and a flow channel is provided between them.

4. The geothermal reinjection equipment with impurity removal function according to claim 2, characterized in that: The filter cartridge (5) specifically includes an inner liner (51) disposed at the bottom of the cover plate (21) and a filter membrane (52) disposed on the outside of the inner liner (51). The length of the inner liner (51) is greater than the length of the filter membrane (52), and connection ends and storage ends are reserved at both ends of the inner liner (51).

5. The geothermal reinjection equipment with impurity removal function according to claim 2, characterized in that: The exhaust assembly (8) specifically includes a riser (81) disposed on the top of the cover plate (21) and the convex pipe (22), a boss (82) disposed on the top of the riser (81), a connecting hole (83) passing through the top of the cover plate (21) and the convex pipe (22), an overflow port (84) disposed on the top of the boss (82), and a sealing bolt (89) disposed at the top opening of the overflow port (84). The lower end of the riser (81) is connected to the docking hole (83), and the upper end of the riser (81) is connected to the overflow port (84).

6. The geothermal reinjection equipment with impurity removal function according to claim 5, characterized in that: The exhaust assembly (8) also includes a receiving groove (85) and a connecting hole (86) opened on the inner wall of the overflow port (84), a sealing ball (87) set inside the receiving groove (85), a partition (88) set inside the overflow port (84), and a discharge hole (810) opened inside the sealing bolt (89). The storage groove (85) and the connecting hole (86) are connected. Both the storage groove (85) and the partition (88) are inclined. The partition (88) is located at the opening of the storage groove (85). One end of the drain hole (810) passes through the bottom of the sealing bolt (89), and the other end passes through the side of the sealing bolt (89).

7. The geothermal reinjection equipment with impurity removal function according to claim 6, characterized in that: The lower opening of the drain hole (810) is provided with a groove that fits the outer contour of the sealing ball (87).

8. The geothermal reinjection equipment with impurity removal function according to claim 7, characterized in that: The inner wall of the water outlet pipe (4) is provided with a limiting ring (41), and a compression sleeve (42) is inserted into the end of the water outlet pipe (4) away from the sealing cover (2). The main board (61) is located between the limiting ring (41) and the compression sleeve (42).

9. A geothermal reinjection method with impurity removal function, employing the geothermal reinjection equipment with impurity removal function as described in claim 1, characterized in that, Includes the following steps: Step 1: Collect the wastewater generated after geothermal utilization and transport it to a sedimentation tank through a collection pipeline to separate impurities using gravity. Step 2: The pretreated tailwater is transported to the filter tank (1), and the filter cartridge (5) is monitored in real time by the pressure sensor. When the pressure difference reaches 0.05MPa, the booster pump is boosted in reverse, and the cleaning component (6) is used to achieve reverse water flow flushing. The backwash wastewater enters the sewage tank through the sewage pipe (7). Step 3: Set up an online monitoring point at the outlet of the water outlet pipe (4) and use a turbidity sensor and a particle counter to detect the water quality in real time.

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