A pre - impurity removal device for geothermal exploitation

Abstract

The present invention relates to the field of geothermal exploitation equipment, and in particular to a pre-treatment impurity removal device for geothermal exploitation, including a tank body with a water inlet at the bottom of one end and a water outlet at the top of the other end. The internal space of the tank body is divided into a sedimentation chamber and a cleaning chamber that are top-connected by a partition along the water flow direction, and the top of the partition is set at the same height as the bottom end face of the water outlet; a medicine box is provided on the tank body, and the medicine box is communicated with the sedimentation chamber through a dosing mechanism; the device further includes a first ring belt tensioned by several tensioning rollers and a waste removal mechanism. The waste removal mechanism includes a waste removal roller that contacts the belt body below the horizontal part of the first ring belt, and a storage box is arranged below the waste removal roller. One end of the storage box in the length direction extends to the outside and is provided with a waste removal port. The structure of the present invention is simple, adopts an overflow drainage method and dynamically filters and removes impurities from geothermal water, ensuring the filtering effect and efficiency of geothermal water.

Description

Technical Field

[0001] The present invention relates to the field of geothermal extraction equipment, and particularly to a pre-treatment impurity removal device for geothermal extraction. Background Art

[0002] Geothermal energy is a renewable energy source with rich reserves, wide distribution, stability and reliability. It mainly realizes the utilization of its heat energy by extracting high-temperature groundwater and through heat exchange. After the groundwater has completed heat exchange, it also needs to be reinjected into the well to meet the requirement of maintaining the heat reservoir pressure.

[0003] The newly extracted groundwater contains a large amount of sulfides and solid impurities. If it directly enters the heat exchange pipe network, it is likely to cause blockage and corrosion of the equipment. Therefore, it also needs to be pre-filtered. Existing treatment equipment mostly performs physical filtration on it through multiple filter media layers, such as the technical solutions disclosed in patent documents with publication numbers CN201711068U, CN111804050A, etc. However, this type of method has poor dynamics and takes a long time, resulting in an increase in the frequency of later maintenance. At the same time, it is also likely to cause the temperature of the geothermal water to drop, thereby reducing the utilization efficiency of geothermal energy. Summary of the Invention

[0004] The purpose of the present invention is to provide a pre-treatment impurity removal device for geothermal extraction. The structure of the present invention is simple, and it adopts an overflow drainage method to dynamically filter and remove impurities from geothermal water, ensuring the filtering effect and efficiency of geothermal water.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A pre-treatment impurity removal device for geothermal extraction, including a tank body with a water inlet at one end of the bottom and a water outlet at the top of the other end. The internal space of the tank body is divided by a partition into a sedimentation chamber and a cleaning chamber that communicate at the top along the water flow direction. The top of the partition is set at the same height as the bottom end face of the water outlet;

[0007] The bottom wall of the sedimentation chamber is arranged in a shape that is high at the water inlet and low towards the partition. A chemical agent tank is provided on the tank body, and the chemical agent tank is connected to the sedimentation chamber through a dosing mechanism;

[0008] The device further includes an impurity removal device, and the impurity removal device includes a first annular mesh belt tensioned by several tensioning rollers and a waste removal mechanism:

[0009] The bottom belt body of the first annular mesh belt is arranged to abut against the side of the partition facing the sedimentation chamber, and the top belt body is located above the water outlet and is arranged horizontally.

[0010] The waste removal mechanism includes a waste removal roller that contacts the lower belt body of the horizontal part of the first annular mesh belt. A storage box is provided below the waste removal roller, and one end of the storage box in the length direction extends to the outside and is provided with a waste removal port.

[0011] Preferably, a plurality of retaining ribs are equidistantly arranged on the surface of the belt body of the first annular mesh belt, and the retaining ribs extend along the width direction of the belt body;

[0012] The impurity removal roller is arranged parallel to the retaining ribs, and a plurality of rubber scraper plates axially extending and contacting the belt body of the first annular mesh belt are equidistantly arranged in the circumferential direction on the roller body;

[0013] The longitudinal section of the storage box is in a funnel-shaped structure with an expanded top, a converged bottom and a circular arc closed bottom. The storage box is arranged at the same height as the water outlet, and an impurity removal auger is arranged inside the circular arc closed section;

[0014] Preferably, the partition plate is inclined with the bottom facing the sedimentation chamber, and a curved groove for fitting the bottom end of the first annular mesh belt is opened at the position close to the bottom end of the partition plate in the sedimentation chamber;

[0015] Preferably, a plurality of impurity removal channels are opened on the bottom wall of the sedimentation chamber, and the impurity removal channels extend along the water flow direction into the curved groove;

[0016] A plurality of drainage and irrigation mechanisms are further arranged in the sedimentation chamber. The drainage and irrigation mechanism includes a drainage and irrigation cylinder and a drainage and irrigation pipe with the bottom end corresponding to the impurity removal channel and equipped with a first one-way valve, and the middle section is fixed on the inner wall of the tank body;

[0017] The drainage and irrigation cylinder is in a conical cylinder structure with a small end face facing downwards and is connected and communicated with the drainage and irrigation pipe;

[0018] Preferably, the outer wall of the drainage and irrigation cylinder is connected with the inner wall of the corresponding tank body through a first chain, and a flange made of foam material is arranged at the top port of the drainage and irrigation cylinder;

[0019] Preferably, adjacent drainage and irrigation cylinders are connected through a second chain. A hanging rod is vertically arranged on the inner wall of the tank body, and the second chain passes through a preset through hole on the hanging rod;

[0020] Preferably, the filling mechanism includes a main pipe rotatably arranged at the bottom wall of the sedimentation chamber. A plurality of groups of stirring rods are axially equidistantly distributed on the outer wall of the main pipe, and each group of stirring rods is circumferentially equidistantly arranged around the pipe body of the main pipe. The two ends of the stirring rod are respectively communicated with the main pipe and the sedimentation chamber;

[0021] The top of the main pipe penetrates to the outside and is sleeved with a driven bevel gear, and the driven bevel gear is meshed and driven with a driving bevel gear arranged at the output end of the stirring motor;

[0022] One end of a filling pipe provided with a pump is assembled with the inner wall of the top end of the main pipe through a bearing, and the other end of the filling pipe is connected to a chemical agent tank;

[0023] Preferably, the impurity removal device further includes a gas purification box disposed above the horizontal portion of the first annular mesh belt. The top of the gas purification box extends vertically outside the tank body and is bent to communicate with the inside of the tank body. The bottom of the gas purification box is open and provided with an exhaust fan group. A horizontal equipment compartment extending to the outside is provided in the middle section of the gas purification box in the vertical direction. A second annular mesh belt is horizontally provided in the equipment compartment. The second annular mesh belt is driven by corresponding tensioning rollers and driving rollers, and an activated carbon adsorbent is carried on the belt body of the second annular mesh belt.

[0024] Preferably, an electric heating member is provided at one end of the equipment compartment outside the tank body below the second annular mesh belt. An exhaust hole is opened on the top wall of the equipment compartment above the electric heating member, and a second one-way valve is provided in the exhaust hole.

[0025] Preferably, a driving roller is provided at the horizontal end of the first annular mesh belt. The coaxial ends of the driving roller, the impurity removal roller, and the impurity removal auger penetrate into a driving compartment provided on the outer wall of the tank body and are sequentially meshed and driven by sleeved gears. The other end of the impurity removal roller is connected to the output end of the driving motor.

[0026] The working process of the present invention is as follows:

[0027] The extracted geothermal water is pumped into the precipitation chamber from the water inlet of the tank body by a pump group and is blocked by the partition and temporarily cannot enter the cleaning chamber. As the water level in the precipitation chamber rises, the pump machine pumps the medicine in the medicine tank into the main pipe through the filling pipe, and at the same time, the stirring motor is started. The stirring motor drives the driving bevel gear and the meshing driven bevel gear to rotate, so that the main pipe rotates circumferentially relative to the filling pipe under the assembly effect of the bearing. On the one hand, the liquid in the precipitation chamber is stirred by the stirring rod, and on the other hand, the medicine is thrown into the liquid by the stirring rod by centrifugal force, realizing the full and efficient mixing of the liquid and the medicine, so that the impurities in the groundwater flocculate and finally settle.

[0028] During the above process, due to the setting of the first one-way valve on the drainage and irrigation pipe, the liquid in the precipitation chamber cannot enter the drainage and irrigation pipe. When the liquid level in the sedimentation tank reaches a certain height, the drainage and irrigation cylinder floats on the liquid surface by means of the flange and has a tendency to maintain this state, but shows the following dynamic changes:

[0029] 1) With the stirring of the stirring rod, the liquid level in the precipitation chamber will fluctuate, so the drainage and irrigation cylinder will change its vertical position with the water wave. At the same time, when liquid enters the drainage and irrigation cylinder, the overall gravity of the drainage and irrigation cylinder will increase, and then the drainage and irrigation cylinder will be pressed below the liquid surface. However, as this part of the liquid is discharged from the first one-way valve and introduced into the impurity removal channel, the drainage and irrigation cylinder uses the buoyancy of the flange to jump out of the liquid surface and increases the fluctuation effect of the liquid surface. Such a cycle realizes the continuous directional drainage effect of the drainage and irrigation pipe, and at the same time increases the turbulent mixing effect of the liquid as a whole.

[0030] 2) In order to ensure the vertical movement of the drainage and irrigation cylinders, adjacent drainage and irrigation cylinders are connected in series through a second chain. In this way, as long as one drainage and irrigation cylinder is filled with water and moves downward, it will link the adjacent drainage and irrigation cylinders to move upward, thereby increasing the fluctuation intensity of the liquid level and further increasing the probability of liquid entering the drainage and irrigation cylinder to trigger the vertical displacement of more drainage and irrigation cylinders.

[0031] Finally, the impurities deposited in the sedimentation bin enter the curved groove from the impurity discharge channel under the dual guidance of the inclined bottom wall of the sedimentation bin and the drainage pipe.

[0032] Turn on the transmission motor, which drives the transmission roller of the first ring mesh belt to rotate. At the same time, under the transmission effect of the mutually meshing gears, the debris removal roller and the debris removal auger rotate synchronously:

[0033] The rotation of the first ring mesh belt allows it to use the retaining ribs to hang the impurities in the curved groove and move them upward. When the impurities move above the impurity discharge roller, they fall under the action of gravity and the pushing effect of the rubber paddle on the impurity discharge roller and eventually enter the storage box. They are continuously pushed to the impurity discharge port by the rotating discharge auger and collected.

[0034] During the above process, the exhaust fan unit is turned on to evacuate the internal space of the gas purification box above it, so that the gas at the top of the gas purification box is bent and connected to the top space of the box body is extracted and discharged to the horizontal part of the first ring mesh belt. On the one hand, the gas will pass through the second ring mesh belt and be mixed with harmful components such as hydrogen sulfide by the activated carbon adsorbent attached to the belt body. On the other hand, the gas can be blown onto the first ring mesh belt after purification, so as to efficiently separate the flocculent impurities accumulated on the mesh belt and make them fall into the storage box.

[0035] At the same time, the second endless mesh belt needs to be kept rotating (using the corresponding motor to drive its drive roller), so that the activated carbon that adsorbs harmful components can reach the top of the electric heating component as the second endless mesh belt rotates and maintains dryness after being heated, thereby ensuring that the activated carbon adsorbent efficiently adsorbs harmful components in the gas. At the same time, the heated and exhausted humid air can be discharged from the second one-way valve at the exhaust hole.

[0036] Finally, as the water level in the sedimentation bin rises, the filtered water passes over the baffle and enters the cleaning bin and is discharged from the outlet.

[0037] Compared with the prior art, the present invention has the following advantages: the present invention has a simple structure, adopts an overflow drainage method and dynamically filters and removes impurities from geothermal water, thereby ensuring the filtering effect and efficiency of geothermal water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the pre-impurity removal equipment for geothermal exploitation according to the specific implementation method;

[0039] Figure 2Schematic diagram of the internal structure of the tank body described in the specific implementation manner;

[0040] Figure 3 Schematic diagram of the structure of the impurity removal device described in the specific implementation manner;

[0041] Figure 4 Schematic diagram of the internal structure of the gas purification box described in the specific implementation manner. Embodiment

[0042] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] As Figures 1-4 shown, a pre-impurity removal device for geothermal exploitation includes a tank body 1 with a water inlet 11 provided at the bottom of one end and a water outlet 12 provided at the top of the other end. The internal space of the tank body 1 is divided into a sedimentation chamber 15 and a cleaning chamber 16 that communicate at the top by a partition plate 13 along the water flow direction. The partition plate 14 is inclined with the bottom facing the sedimentation chamber 15, and the top of the partition plate 14 is at the same height as the bottom end face of the water outlet 12;

[0044] The bottom wall of the sedimentation chamber 15 is arranged in a shape that gradually decreases from high to low along the direction from the water inlet 11 to the partition plate 14. A chemical agent tank 2 is provided on the tank body 1, and the chemical agent tank 2 is communicated with the sedimentation chamber 15 through a filling mechanism;

[0045] The device further includes an impurity removal device, which includes a first ring-shaped mesh belt 5 tensioned by several tensioning rollers, a waste discharge mechanism and a gas purification box:

[0046] The bottom belt body of the first ring-shaped mesh belt 5 is arranged to abut against the side of the partition plate 14 facing the sedimentation chamber 15, and the top belt body is located above the water outlet 12 and is horizontally arranged. Several retaining ribs 55 are equidistantly arranged on the belt body surface of the first ring-shaped mesh belt 5, and the retaining ribs 55 extend along the width direction of the belt body;

[0047] A curved surface groove 17 adapted to the bottom end of the first ring-shaped mesh belt 5 is opened at the bottom end of the sedimentation chamber 15 near the partition plate 14. Several waste discharge channels 16 are opened on the bottom wall of the sedimentation chamber 15, and the waste discharge channels 16 extend along the water flow direction into the curved surface groove 17.

[0048] The impurity removal mechanism includes an impurity removal roller 52 arranged parallel to the baffle rib 55. A plurality of rubber flap plates extending axially and contacting the belt body below the horizontal part of the first annular mesh belt 5 are circumferentially and equidistantly arranged on the roller body of the impurity removal roller 52. Below the impurity removal roller 52, there is a storage box 53. One end of the storage box 53 in the length direction extends to the outside and is provided with an impurity discharge port, and the impurity discharge port is closed by a cover. The longitudinal section of the storage box 53 is in a funnel-shaped structure with an expanded top, a converged bottom and an arc-shaped closure. The storage box 53 is arranged at the same height as the water outlet 12, and an impurity removal auger 54 is arranged inside the arc-shaped closed section thereof. Among them, a driving roller 51 is provided at the horizontal end of the first annular mesh belt 5. The same-direction ends of the driving roller 51, the impurity removal roller 52 and the impurity removal auger 54 penetrate into a driving chamber 13 arranged on the outer wall of the tank body 1 and are sequentially meshed and driven through sleeved gears 7. The other end of the impurity removal roller 52 is connected to the output end of a driving motor 56.

[0049] The gas purification box 6 is arranged above the horizontal part of the first annular mesh belt 5. The top of the gas purification box 6 extends vertically to the outside of the tank body 1 and is bent and communicated with the inside of the tank body 1. The bottom of the gas purification box 6 is open and provided with an exhaust fan group 63. In the middle section of the gas purification box 6 in the vertical direction, there is an equipment chamber 61 extending horizontally to the outside. A second annular mesh belt 62 is horizontally arranged in the equipment chamber 61. The second annular mesh belt 62 is driven by corresponding tensioning rollers and driving rollers, and the belt body of the second annular mesh belt 62 is loaded with an activated carbon adsorbent. One end of the equipment chamber 61 outside the tank body is provided with an electric heating component 64 below the second annular mesh belt 62. An exhaust hole 65 is opened on the top wall of the equipment chamber 61 above the electric heating component 64, and a second one-way valve is arranged in the exhaust hole 65.

[0050] A plurality of drainage and irrigation mechanisms are further arranged in the sedimentation chamber 15. The drainage and irrigation mechanism includes a drainage and irrigation cylinder 42 and a drainage and irrigation pipe 41 with its bottom end corresponding to the impurity drainage channel 16 and equipped with a first one-way valve, and the middle section is fixed on the inner wall of the tank body 1. The drainage and irrigation cylinder 42 is in a conical cylinder structure with a small end facing downwards and is connected and communicated with the drainage and irrigation pipe 41. The outer wall of the drainage and irrigation cylinder 42 is connected to the corresponding inner wall of the tank body 1 through a first chain 46. A flange 43 made of foam material is arranged at the top port of the drainage and irrigation cylinder 42. Adjacent drainage and irrigation cylinders 42 are connected through a second chain 44. A hanging rod 45 is vertically arranged on the inner wall of the tank body 1, and the second chain 44 penetrates through a preset through hole on the hanging rod 45.

[0051] The filling mechanism includes a main pipe 34 rotatably arranged at the bottom wall of the sedimentation chamber 15. The inner wall of the top end of the main pipe 34 is assembled with one end of a filling pipe 21 provided with a pump 22 through a bearing 33, and the other end of the filling pipe 21 is connected to a chemical agent tank 2;

[0052] The outer wall of the main pipe 34 is axially and equidistantly distributed with an array of stirring rods 35. Each group of stirring rods 35 is circumferentially and equidistantly arranged around the pipe body of the main pipe 34. Both ends of the stirring rod 35 are respectively connected to the main pipe 34 and the sedimentation tank 15. The top of the main pipe 34 penetrates to the outside and is sleeved with a driven bevel gear 32, and the driven bevel gear 32 is meshed and driven with a driving bevel gear 31 arranged at the output end of the stirring motor 3.

[0053] The working process of the present invention is as follows:

[0054] The extracted geothermal water is pumped into the sedimentation tank 15 from the water inlet 11 of the tank body by the pump group and is blocked by the partition plate 14 and temporarily cannot enter the cleaning tank 16. As the water level in the sedimentation tank 15 rises, the pump 22 pumps the medicine in the medicine tank 2 into the main pipe 34 through the injection pipe 21. At the same time, the stirring motor 3 is started. The stirring motor 3 drives the driving bevel gear 31 and the meshed driven bevel gear 32 to rotate, so that the main pipe 34 rotates circumferentially relative to the injection pipe 21 under the assembly effect of the bearing 33. On the one hand, the liquid in the sedimentation tank 15 is stirred by the stirring rod 35. On the other hand, the medicine is injected into the liquid by the centrifugal force through the stirring rod 35, realizing the full and efficient mixing of the liquid and the medicine, so that the impurities in the groundwater flocculate and finally settle.

[0055] In the above process, due to the setting of the first one-way valve on the irrigation and drainage pipe 41, the liquid in the sedimentation tank 15 cannot enter the irrigation and drainage pipe 41. When the liquid level in the sedimentation tank 15 reaches a certain height, the drainage cylinder 42 floats on the liquid surface by means of the flange 43 and has a tendency to maintain this state, but shows the following dynamic changes:

[0056] 1) With the stirring of the stirring rod 35, the liquid level in the sedimentation tank 15 will fluctuate. Therefore, the drainage cylinder 42 will change its vertical position with the water wave. At the same time, when liquid enters the drainage cylinder 42, the overall gravity of the drainage cylinder 42 will increase, and then the drainage cylinder 42 will be pressed down below the liquid surface. However, as this part of the liquid is discharged from the first one-way valve and introduced into the impurity drainage channel 16, the drainage cylinder 42 will emerge from the liquid surface by the buoyancy of the flange 43 and increase the fluctuation effect of the liquid surface. Such a cycle realizes the continuous directional drainage effect of the irrigation and drainage pipe 41, and at the same time increases the turbulent mixing effect of the whole liquid.

[0057] 2) In order to ensure the vertical movement of the drainage cylinder 42, adjacent drainage cylinders 42 are connected in series by the second chain 44. In this way, as long as one drainage cylinder 42 realizes water inlet and downward movement, it will drive the adjacent drainage cylinder 42 to move upward, thereby increasing the fluctuation intensity of the liquid surface and further increasing the probability of liquid entering the drainage cylinder 42 to cause more vertical displacements of the drainage cylinder 42.

[0058] Finally, the impurities deposited in the sedimentation bin 15 enter the curved groove 17 from the impurity drainage channel 16 under the dual guidance of the inclined bottom wall of the sedimentation bin and the drainage pipe 41 .

[0059] The transmission motor 56 is turned on, and the transmission motor 56 drives the transmission roller 51 of the first endless mesh belt 5 to rotate. At the same time, under the transmission effect of the mutually meshing gears 7, the debris removal roller 52 and the debris removal auger 54 rotate synchronously:

[0060] The rotation of the first endless mesh belt 5 enables it to use the retaining ribs 55 to carry and move upward the impurities in the curved groove 17. When the impurities move above the impurity discharge roller 52, they fall under the action of gravity and the pushing effect of the rubber paddle on the impurity discharge roller 52 and eventually enter the storage box 53. They are continuously pushed to the impurity discharge port by the rotating discharge auger 54 and collected.

[0061] During the above process, the exhaust fan unit 63 is turned on to evacuate the internal space of the gas purification box 6 above it, so that the gas at the top of the gas purification box 6 is bent and connected to the top space in the box body 1, and the gas is extracted and discharged to the horizontal part of the first ring mesh belt 5. On the one hand, the gas will pass through the second ring mesh belt 62 and be mixed with harmful components such as hydrogen sulfide by the activated carbon adsorbent attached to the belt body. On the other hand, the gas can be blown onto the first ring mesh belt 5 after purification, so as to efficiently separate the flocculent impurities accumulated on the mesh belt and make them fall into the storage box 53.

[0062] At the same time, the second endless mesh belt 62 needs to be kept rotating (using the corresponding motor to drive its drive roller), so that the activated carbon that adsorbs harmful components can reach the top of the electric heating component 64 with the rotation of the second endless mesh belt 62 and maintain the drying performance after being heated, thereby ensuring that the activated carbon adsorbent efficiently adsorbs harmful components in the gas. At the same time, the heated and exhausted humid air can be discharged from the second one-way valve at the exhaust hole 65.

[0063] Finally, as the water level in the sedimentation bin 15 rises, the filtered water passes over the partition 14 and enters the cleaning bin 16 and is discharged from the water outlet 12 .

Claims

1. A pre - impurity removal device for geothermal exploitation, comprising a tank body with a water inlet at the bottom of one end and a water outlet at the top of the other end, characterized in that, The internal space of the tank body is divided into a sedimentation chamber and a cleaning chamber that communicate with each other at the top by a partition along the water flow direction, and the top of the partition is set at the same height as the bottom end face of the water outlet; The bottom wall of the sedimentation chamber is arranged in a shape that gradually decreases from the water inlet to the partition, and a chemical agent tank is provided on the tank body. The chemical agent tank is communicated with the sedimentation chamber through a filling mechanism; The device further includes a impurity removal device, which includes a first annular net belt tensioned by several tensioning rollers and a impurity discharge mechanism: The bottom belt body of the first annular net belt is arranged against the side of the partition facing the sedimentation chamber, and the top belt body is located above the water outlet and is horizontally arranged, The impurity discharge mechanism includes an impurity discharge roller that contacts the lower belt body of the horizontal part of the first annular net belt. A storage box is arranged below the impurity discharge roller, and one end of the storage box in the length direction extends to the outside and is provided with an impurity discharge port; The partition is arranged in a shape that is inclined towards the sedimentation chamber at the bottom. A curved groove for fitting the bottom end of the first annular net belt is opened near the bottom end of the partition of the sedimentation chamber, and several impurity discharge channels are opened on the bottom wall of the sedimentation chamber. The impurity discharge channels extend along the water flow direction into the curved groove; Several stirring rods and a drainage and irrigation mechanism are further arranged in the sedimentation chamber. The drainage and irrigation mechanism includes a drainage and irrigation cylinder and a drainage and irrigation pipe whose bottom end corresponds to the impurity discharge channel and is equipped with a first one-way valve, and the middle section is fixed on the inner wall of the tank body. The drainage and irrigation cylinder is a conical cylinder structure with a small end facing downwards and is connected and communicated with the drainage and irrigation pipe. A flange made of foam material is arranged at the top port of the drainage and irrigation cylinder; When the stirring rod stirs the liquid in the sedimentation chamber, part of the liquid enters the drainage and irrigation cylinder, and the drainage and irrigation cylinder moves up and down on the liquid surface under the buoyancy force given by the liquid to the flange.

2. The pre-impurity removal device for geothermal exploitation according to claim 1, wherein, Several anti-blocking ribs are arranged at equal intervals on the surface of the belt body of the first annular net belt, and the anti-blocking ribs extend along the width direction of the belt body; The impurity discharge roller is arranged parallel to the anti-blocking ribs, and several rubber scraper plates that axially extend and contact the belt body of the first annular net belt are arranged at equal intervals in the circumferential direction on the roller body of the impurity discharge roller; The longitudinal section of the storage box is a hopper-shaped structure with an expanded top, a converged bottom and a circular arc closed bottom. The storage box is set at the same height as the water outlet, and an impurity discharge auger is arranged inside the circular arc closed section of the storage box.

3. The pre - impurity removal device for geothermal exploitation according to claim 1, wherein, The outer wall of the drainage and irrigation cylinder is connected to the corresponding inner wall of the tank body through a first chain, and a flange made of foam material is arranged at the top port of the drainage and irrigation cylinder.

4. The pre - impurity removal device for geothermal exploitation according to claim 3, wherein, Adjacent drainage and irrigation cylinders are connected through a second chain. A hanging rod is vertically arranged on the inner wall of the tank body, and the second chain passes through a preset through hole on the hanging rod.

5. The pre - impurity removal device for geothermal exploitation according to claim 1, characterized in that, The filling mechanism includes a main pipe rotatably arranged at the bottom wall of the sedimentation chamber. Several groups of stirring rods are axially distributed at equal intervals on the outer wall of the main pipe, and each group of stirring rods is circumferentially arranged around the main pipe body at equal intervals. The two ends of the stirring rod are respectively communicated with the main pipe and the sedimentation chamber; The top of the main pipe penetrates to the outside and is sleeved with a driven bevel gear, and the driven bevel gear is meshed and driven with a driving bevel gear arranged at the output end of the stirring motor; One end of a filling pipe provided with a pump is assembled with the inner wall of the top end of the main pipe through a bearing, and the other end of the filling pipe is connected to the chemical agent tank.

6. The pre - impurity removal device for geothermal exploitation according to claim 1, characterized in that, The impurity removal device further includes a gas purification box disposed above the horizontal portion of the first annular mesh belt. The top of the gas purification box extends vertically to the outside of the tank body and is bent to communicate with the inside of the tank body. The bottom of the gas purification box is open and is provided with an exhaust fan group in parallel. A horizontal equipment bin extending to the outside is provided in the middle section of the gas purification box in the vertical direction. A second annular mesh belt is horizontally provided in the equipment bin. The second annular mesh belt is driven by corresponding tensioning rollers and driving rollers, and an activated carbon adsorbent is carried on the belt body of the second annular mesh belt.

7. The pre - impurity removal device for geothermal exploitation according to claim 6, characterized in that, One end of the equipment bin located outside the tank body is provided with an electric heating member located below the second annular mesh belt. An exhaust hole is opened on the top wall of the equipment bin above the electric heating member, and a second one-way valve is provided in the exhaust hole.

8. The pre - impurity removal device for geothermal exploitation according to claim 2, wherein, A driving roller is provided at the horizontal end of the first annular mesh belt. The same-direction ends of the driving roller, the impurity removal roller, and the impurity removal auger penetrate into a driving bin provided on the outer wall of the tank body and are sequentially meshed and driven through sleeved gears. The other end of the impurity removal roller is connected to the output end of a driving motor.

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