Steam purifying and recycling device for geothermal power generation and zero-shutdown operation method

Abstract

The device comprises a water suction pump, a water conveying pipe is fixedly connected to the right side of the water suction pump, at least two sets of processing mechanisms which can be online standby for each other are fixedly connected to the right side of the water conveying pipe, one set is in a running state, and the other set is in a standby state. The left side of the treatment mechanism is fixedly connected with a water pipe, the right side of the water pipe is fixedly connected with a control pump, each treatment mechanism comprises a treatment box, the left side face of the inner side of each treatment box is rotationally connected with a rotating frame, and the outer side of each rotating frame is movably sleeved with a filter screen cylinder; the two mechanisms are switched through an external valve, hot water and water supplementing and draining loops are alternated, and shutdown is not needed during maintenance; the liquid level sensor and the control pump supplement water in a closed loop mode, and geothermal water full-recycling circulation is formed. The functions of filtering, flash evaporation, water supplementing and slag discharging are achieved through the single cavity, redundancy of multiple cavities is omitted, and the system is suitable for various geothermal power stations.

Description

Technical Field

[0001] This invention relates to the field of geothermal power generation technology, and in particular to a device and its working method that can continuously purify and recycle geothermal steam and perform filter maintenance without stopping the power plant operation. Background Technology

[0002] Geothermal power generation is a new type of power generation technology that uses underground hot water and steam as a power source. Its basic principle is similar to that of thermal power generation. It is also based on the principle of energy conversion. First, geothermal energy is converted into mechanical energy, and then mechanical energy is converted into electrical energy. Geothermal power generation is actually the energy conversion process of converting underground thermal energy into mechanical energy and then mechanical energy into electrical energy.

[0003] Chinese patent document CN215979726U discloses a high-utilization geothermal power generation device with steam purification function, including fixed plates, with support rods fixedly connected between the fixed plates. A water storage tank is fixedly installed on the inner side of the support rods, and the lower end of the water storage tank is fixedly connected to the fixed plates. A base is fixedly installed on the upper end of the water storage tank, and a return pump is fixedly installed on the upper end of the base. A recovery pipe is fixedly connected to the outer end of the return pump, and the return pump is fixedly connected to a processing tank through the recovery pipe. A steam turbine is fixedly installed on the right end of the processing tank, and a generator is fixedly installed on the right end of the steam turbine. This high-utilization geothermal power generation device with steam purification function allows high-temperature water that fails to pass through the steam equalization hole to enter the recovery chamber, facilitating the recovery of unused groundwater into the return pump, greatly ensuring the high utilization of the device. The device has a high overall service life and working efficiency, and is highly operable.

[0004] However, the filtration components of this device are located inside the processing chamber and around the flash evaporator, which makes it difficult to operate, disassemble, and maintain the filter screen when replacing it. In addition, since only a single processing chamber is used, multiple chambers or multiple processing chambers are usually required to achieve multiple functions, resulting in a complex structure and cumbersome piping connections. Furthermore, the entire equipment will be shut down during maintenance, resulting in low utilization. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a geothermal steam purification and recycling device that can replace the filter screen without stopping the machine, realize the functions of filtration, flash evaporation, water replenishment and slag discharge in a single chamber, and provide a zero-downtime operation method to overcome the defects of the prior art such as difficult maintenance, low utilization rate and complex structure.

[0006] The technical solution adopted by this invention to solve the technical problem is as follows: A steam purification and recycling device for geothermal power generation includes a water pump, a water supply pipe fixedly connected to the right side of the water pump, at least two sets of processing mechanisms that can be used as online backups for each other fixedly connected to the right side of the water supply pipe, one set being in operation and the other set being in standby mode, a water pipe fixedly connected to the left side of the processing mechanism, and a control pump fixedly connected to the right side of the water supply pipe. Each of the aforementioned processing mechanisms includes a processing box. A rotating frame is rotatably connected to the inner left side of the processing box. A filter cylinder is movably sleeved on the outer side of the rotating frame. A mechanism rod is fixedly connected to the inner left side of the processing box. A flash evaporator is fixedly connected to the upper side of the mechanism rod. A gas distribution pipe is fixedly connected to the inner left side of the processing box. The bottom of the processing box is inclined to the lower right. The filter cylinder, flash evaporator, and gas distribution pipe are arranged in the same cavity inside the box. There are no partitions inside, forming a continuous cavity.

[0007] Preferably, a cover plate is fixedly connected to the right side of the treatment box via a flange structure, a connecting plate is rotatably connected to the left side of the cover plate, an insertion tube is fixedly connected to the left side of the treatment box, a first insertion block is fixedly connected to the left side of the treatment box, and several annularly distributed second insertion blocks are fixedly connected to the left side of the connecting plate; a motor is fixedly connected to the right side of the treatment box, a gear is fixedly connected to the output end of the motor, the outer side of the gear is movably sleeved on the inner side of the cover plate, a gear ring is fixedly connected to the inner side of the connecting plate, and the lower side of the gear meshes with the bottom of the gear ring; rubber sleeves are fixedly connected to the outer side of the insertion tube, the outer side of the first insertion block, and the outer side of the several second insertion blocks; the cover plate can simultaneously fix or release the filter cylinder, flash evaporator, and air distribution pipe with a single disassembly and assembly, and allows the filter cylinder to be pulled out axially.

[0008] Preferably, the bottom of the treatment tank is tilted to the lower right; two liquid level sensors are fixedly connected to the inner left side of the treatment tank, and a water inlet is opened on the inner left side of the treatment tank; an observation window is fixedly connected to the outer wall of the treatment tank; the control pump is linked in a closed loop with the upper and lower liquid level sensors to keep the liquid level in the tank constant, so as to achieve 100% reuse of geothermal water.

[0009] Preferably, by switching external valves, the geothermal hot water and water supply / drainage circuits can be interchanged between the two treatment units, achieving zero-downtime online maintenance of the power station; the external valve group adopts an "open first, close later" sequence, with a switching time of ≤3 minutes, and the power station load remains at 100%.

[0010] Preferably, the motor drives the rotating frame to rotate the filter screen cylinder periodically, so that the filter screen filters evenly around the entire circumference, extending the single maintenance cycle; the rotation speed is continuously adjustable from 0-5 r / min, so that the filter screen bears the filtration load evenly around the entire circumference.

[0011] Preferably, the control pump automatically replenishes or pumps water into the treatment tank based on the signal from the liquid level sensor, maintaining a constant liquid level in the tank and achieving a closed-loop circulation of geothermal water; all flash condensate is returned to the storage tank, with no external discharge on site.

[0012] A method for achieving zero-downtime operation of geothermal steam purification and recycling using the above-mentioned device includes the following steps: S1. Start the water pump to send the underground hot water through the water pipe into the processing unit that is in operation, while the other processing unit is in standby position. S2. Hot water enters the clean water zone inside the filter cylinder after being filtered through the filter screen. S3. The flash evaporator instantly depressurizes and flashes the hot water in the water purification area. The resulting saturated steam is then sent to the steam turbine for power generation via the gas distribution pipe and the insertion pipe. S4. The exhaust steam after work is condensed and returned to the water storage tank; S5. When the liquid level in the operating position processing tank is lower than the lower liquid level sensor, the control pump will automatically replenish water; when the liquid level is higher than the upper liquid level sensor, the control pump will pump water back into the tank to maintain a constant liquid level. S6. The motor periodically drives the filter cylinder to rotate slowly, so that the filter screen participates in filtration evenly around the entire circumference; S7. When maintenance is required, switch the external valve to switch the geothermal hot water and water supply / drainage circuit from the operating position processing mechanism to the standby position processing mechanism to complete the zero-downtime switching. S8. Open the cover of the mechanism to be maintained, pull out the filter screen cylinder axially for offline cleaning or replacement, and remove the filter residue deposited at the bottom of the inclined box. S9. After maintenance, reinstall the filter screen and close the cover. The processing mechanism will then enter standby mode again, waiting for the next switch. During standby, the inlet valve of the standby position is slightly opened by 10% to maintain a temperature difference of ≤3℃ with the operating position to avoid thermal shock.

[0013] Preferably, the switching step S7 is completed under 100% load of the power station, the switching time is ≤3 minutes, and the power station does not need to reduce load or shut down during the entire process; the switching trigger condition is that the pressure difference of the observation window is ≥0.05 MPa or the operation has been completed for 30 days, and the valve timing command is issued by the central control room with one click to complete the automatic switching.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Zero downtime maintenance: This invention sets up two processing mechanisms that serve as online hot backups for each other. They can be operated alternately by switching valves. When one is under maintenance, the entire equipment can still operate normally. During filter maintenance, the power station does not need to reduce load or shut down, effectively improving the utilization rate of the equipment.

[0015] 2. Simple structure: The single-chamber treatment box realizes four major functions: filtration, flash evaporation, water replenishment and slag discharge. It eliminates multi-chamber and redundant pipelines, reducing the overall complexity by about 30% and the number of leakage points by 40%.

[0016] 3. Convenient maintenance: The cover plate can be disassembled and installed at the same time to fix or release the filter cylinder, flash evaporator and air distribution pipe. Offline cleaning can be completed by a single person in 0.5 hours. The maintenance time is shortened from the traditional 8 hours to 0.5 hours. It is easy to disassemble and install and simple to maintain.

[0017] 4. Extended lifespan: The motor-driven filter cylinder rotates slowly, evenly distributing the filtration load throughout the circumference, reducing the clogging rate and extending the filter lifespan by 1.8 times. 5. Zero-discharge circulation: The liquid level and water replenishment are fully automatic closed-loop systems, and all flash condensate is reused, achieving 100% recycling of geothermal water with no external discharge, resulting in significant environmental benefits. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the processing mechanism part of the present invention; Figure 3 This is a partial cross-sectional three-dimensional structural diagram of the processing mechanism part of the present invention; Figure 4 This is a partial exploded three-dimensional cross-sectional view of the processing mechanism part of the present invention; Figure 5 This is a partial exploded three-dimensional structural diagram of the cover plate portion of the present invention.

[0019] In the diagram: 1. Water pump; 2. Water pipe; 3. Processing mechanism; 31. Processing tank; 32. Rotating frame; 33. Filter screen; 34. Mechanism rod; 35. Flash evaporator; 36. Gas distribution pipe; 37. Cover plate; 38. Observation window; 39. Insertion tube; 310. First insertion block; 311. Connecting plate; 312. Second insertion block; 313. Motor; 314. Gear; 315. Gear ring; 316. Liquid level sensor; 317. Water inlet; 4. Water pipe; 5. Control pump. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments. Example

[0021] like Figures 1-5As shown, a steam purification and recycling device for geothermal power generation includes a water pump 1, a water supply pipe 2 fixedly connected to the right side of the water pump 1, at least two sets of processing mechanisms 3 that can be used as online backups for each other fixedly connected to the right side of the water supply pipe 2, one set being in operation and the other set being in standby mode, a water pipe 4 fixedly connected to the left side of the processing mechanism 3, and a control pump 5 fixedly connected to the right side of the water pipe 4. Each processing unit 3 includes a processing box 31, a rotating frame 32 rotatably connected to the inner left side of the processing box 31, a filter cylinder 33 movably sleeved on the outer side of the rotating frame 32, a mechanism rod 34 fixedly connected to the inner left side of the processing box 31, a flash evaporator 35 fixedly connected to the upper side of the mechanism rod 34, and an air distribution pipe 36 fixedly connected to the inner left side of the processing box 31.

[0022] It should be noted that the left side of the water pump 1 is connected to the extraction of underground hot water, the water supply pipe 2 is Y-shaped, and each branch is connected to a valve. The right side of the control pump 5 is connected to the water storage tank, the water supply pipe 4 is Y-shaped, and each branch is connected to a valve. The water pumped by the water pump 1 is sent into the treatment tank 31. After being filtered by the filter screen cylinder 33, it enters the filter screen cylinder 33. The flash evaporator 35 flashes the water in the filter screen cylinder 33, and the generated steam enters the gas distribution pipe 36. The outer side of the rotating frame 32 is provided with a horizontal groove to limit the movement between the filter screen cylinder 33 and the rotating frame 32.

[0023] like Figure 4 , Figure 5 As shown, a cover plate 37 is fixedly connected to the right side of the processing box 31 via a flange structure, a connecting plate 311 is rotatably connected to the left side of the cover plate 37, an insertion tube 39 is fixedly connected to the left side of the processing box 31, a first insertion block 310 is fixedly connected to the left side of the processing box 31, and several second insertion blocks 312 arranged in a ring are fixedly connected to the left side of the connecting plate 311.

[0024] It should be noted that a flexible hose equipped with a valve is connected to the right side of the insertion tube 39. The flexible hose is used to connect to the steam turbine. The insertion tube 39 is inserted into the inside of the gas distribution pipe 36. The first insertion block 310 is inserted into the first insertion hole opened on the right side of the mechanism rod 34. The outer side of the second insertion block 312 is inserted into the second insertion hole opened on the right side of the rotating frame 32. This allows the cover plate 37 to close the right side of the processing box 31 and simultaneously fix the rotating frame 32, the mechanism rod 34, and the gas distribution pipe 36.

[0025] like Figure 5 As shown, a motor 313 is fixedly connected to the right side of the processing box 31, and a gear 314 is fixedly connected to the output end of the motor 313. The outer side of the gear 314 is movably sleeved on the inner side of the cover plate 37. A gear ring 315 is fixedly connected to the inner side of the connecting plate 311, and the lower side of the gear 314 is meshed with the bottom of the gear ring 315.

[0026] It should be noted that the motor 313 is used to drive the gear 314 to rotate. When the gear 314 rotates, it drives the gear ring 315 to rotate, which in turn drives the connecting plate 311. This causes the rotating frame 32 to drive the filter screen cylinder 33, so that the outer side of the filter screen cylinder 33 can be alternately positioned near the outlet of the water supply pipe 2, thereby improving the durability of the filter screen cylinder 33 and extending the maintenance time.

[0027] like Figure 4 , Figure 5 As shown, rubber sleeves are fixedly connected to the outer side of the insertion tube 39, the outer side of the first insertion block 310, and the outer side of several second insertion blocks 312.

[0028] It should be noted that the rubber sleeve is used to fill the gaps between the components to prevent the rotating frame 32, the mechanism rod 34, and the air distribution pipe 36 from shaking, and to prevent air leakage between the insertion tube 39 and the air distribution pipe 36.

[0029] like Figure 4 As shown, the bottom of the processing box 31 is tilted to the lower right.

[0030] It should be noted that the structural design of the treatment tank 31 allows the filter residue isolated by the filter screen cylinder 33 to automatically flow to the right after water is supplied into the treatment tank 31 through the water supply pipe 2, thus preventing it from accumulating near the outlet of the water supply pipe 2.

[0031] like Figure 4 As shown, two liquid level sensors 316 are fixedly connected to the inner left side of the treatment tank 31, and a water inlet 317 is provided on the inner left side of the treatment tank 31.

[0032] It should be noted that the upper liquid level sensor 316 is located between the air distribution pipe 36 and the water inlet 317, while the lower liquid level sensor 316 is located near the horizontal plane of the mechanism rod 34. The water inlet 317 is used to connect the water pipe 4. When the water level in the treatment tank 31 is lower than the lower liquid level sensor 316, the lower liquid level sensor 316 detects this situation and, relying on the external control equipment, operates the control pump 5 to deliver water into the treatment tank 31. When the liquid surface contacts the upper liquid level sensor 316, the control pump 5 pumps water into the treatment tank 31.

[0033] like Figure 4 As shown, an observation window 38 is fixedly connected to the outer wall of the processing box 31.

[0034] It should be noted that the observation window 38 is used to facilitate observation of the filter cylinder 33 from the outside, so as to remind the user whether the filter cylinder 33 needs maintenance.

[0035] The working principle of this invention is as follows: First, the left side of the water pump 1 is connected to extract underground hot water. The water delivery pipe 2 is Y-shaped, with a valve connected to each branch. The right side of the control pump 5 is connected to a water storage tank. The water supply pipe 4 is Y-shaped, with a valve connected to each branch. The water pumped by the water pump 1 is sent into the treatment tank 31. After being filtered by the filter screen cylinder 33, the water enters the filter screen cylinder 33. The flash evaporator 35 flashes the water in the filter screen cylinder 33, and the generated steam enters the gas distribution pipe 36. The outer side of the rotating frame 32 is provided with a horizontal groove for adjusting the filter screen cylinder 33 and the rotating frame 36. Limiting is achieved between 2. A flexible hose equipped with a valve is connected to the right side of the insertion tube 39, which is used to connect to the steam turbine. The insertion tube 39 is inserted into the inside of the gas distribution pipe 36. The first insertion block 310 is inserted into the first insertion hole on the right side of the mechanism rod 34, and the outer side of the second insertion block 312 is inserted into the second insertion hole on the right side of the rotating frame 32. This allows the cover plate 37 to close the right side of the processing box 31 and simultaneously fix the rotating frame 32, the mechanism rod 34, and the gas distribution pipe 36. By setting two processing mechanisms 3, the entire equipment can still be maintained during maintenance of one of them. Normal operation relies on the direct disassembly and assembly of the cover plate 37 to quickly fix the mechanism rod 34, rotating frame 32, and air distribution pipe 36, while also facilitating maintenance of the filter cylinder 33. Disassembly and assembly are convenient, and maintenance is simple. Finally, the upper liquid level sensor 316 is located between the air distribution pipe 36 and the water inlet 317, while the lower liquid level sensor 316 is located near the horizontal plane of the mechanism rod 34. The water inlet 317 is used to connect to the water pipe 4. When the water level in the treatment tank 31 is lower than the lower liquid level sensor 316, the lower liquid level sensor 316 detects this. In one scenario, relying on external control equipment, the control pump 5 is operated to deliver water into the treatment tank 31. When the liquid level contacts the upper liquid level sensor 316, the control pump 5 pumps water out of the treatment tank 31. Through the interlocking of the filter screen cylinder 33, the mechanism rod 34, and the air distribution pipe 36, the treatment tank 31 can handle the temporary storage of excess water, the replenishment of water when the water volume is low, and the water filtration operation with only one chamber. The structure is simple and avoids the need to separate multiple chambers and add extra components for water transportation in different chambers, which would lead to maintenance difficulties. Example

[0036] A method for zero-downtime operation of geothermal steam purification and recycling using the device described in Example 1 includes the following steps: S1. Start the water pump 1 to send the underground hot water through the water pipe 2 into the processing unit 3, which is in operation, while the other processing unit is in standby position. S2. Hot water enters the clean water zone inside the filter cylinder after being filtered through the filter screen 33. S3, flash evaporator 35 instantaneously depressurizes and flashes the hot water in the water purification area, and the resulting saturated steam is sent to the steam turbine for power generation via the gas distribution pipe 36 and the insertion pipe 39 in sequence. S4. The exhaust steam after work is condensed and returned to the water storage tank; S5. When the liquid level in the operating position processing tank 31 is lower than the lower liquid level sensor 316, the control pump 5 automatically replenishes water; when the liquid level is higher than the upper liquid level sensor 316, the control pump 5 pumps water back to the tank to maintain a constant liquid level. S6, Motor 313 periodically drives the filter cylinder 33 to rotate slowly, so that the filter screen participates in filtration evenly around the entire circumference; S7. When maintenance is required, switch the external valve to switch the geothermal hot water and water supply / drainage circuit from the operating position processing mechanism 3 to the standby position processing mechanism to complete the zero-downtime switching. S8. Open the cover plate 37 of the maintenance mechanism, axially pull out the filter screen cylinder 33 for offline cleaning or replacement, and remove the filter residue deposited at the bottom of the inclined box. S9. After maintenance is completed, the filter screen 33 is reinstalled and the cover 37 is closed. The processing mechanism 3 then enters standby mode again, waiting for the next switch.

[0037] The switching step S7 is completed at 100% load of the power station, with a switching time of ≤3 minutes, and the power station does not need to reduce load or shut down during the entire process. Example

[0038] A. Structural Layout: A large-scale steam purification and recycling device for geothermal power generation has a production well outlet connected to a water pump, and the water pump outlet connected to a water delivery pipe. The water delivery pipe splits into two branches near the treatment unit, each branch is equipped with a gate valve, which is connected to the water inlet of the left and right treatment units respectively.

[0039] Each treatment unit has a water inlet connected to a water pipe. The two water pipes merge and are connected to a control pump. The outlet of the control pump forms a closed loop with the water storage tank.

[0040] B. Parameters: Design pressure 1.6 MPa, temperature 160 ℃; inner diameter of the treatment chamber φ1200 mm, material Q345R+316L composite board; filter cylinder uses 316L woven mesh, filtration accuracy 100 μm, effective filtration area 6 m²; motor 0.75 kW frequency conversion, 0-5 r / min continuously adjustable, rotates 30° every 6 h.

[0041] C. The operating steps are as follows: ① Normal operating conditions: Open the left gate valve and close the right gate valve; hot water passes through filter cylinder 33 → flash evaporator 35 → air distribution pipe 36 → insertion pipe 39 → steam turbine; ② Liquid level closed loop: When the lower liquid level sensor 316 is triggered, the control pump 5 is used to replenish water into the tank; when the upper liquid level sensor 316 is triggered, the control pump 5 is used to pump water out, and the water level is always maintained between the two sensors. ③ Standby side preheating: The right gate valve is slightly opened by 10% to keep the hot water flowing slowly, so that the right processing mechanism is in hot standby state, and the temperature difference between the right and the operating side is ≤3℃; ④ Switching and maintenance: When the differential pressure is ≥0.05 MPa as seen in observation window 38 or the operating time reaches 30 days, the gate valve in the central control room is switched with one button → the right side is engaged and the left side is isolated; the entire switching process takes less than 3 minutes and the power plant load is not disturbed. ⑤ Offline maintenance: Open the left cover 37, pull out the filter screen 33 in one go, rinse it with a high-pressure water gun and then reinstall it; the filter residue deposited at the bottom of the tilted box will be collected with the water flow to the side of the cover and removed together. The maintenance time is ≤30 min. ⑥ After maintenance is complete, the left side re-enters hot standby mode, awaiting the next switchover.

[0042] D. Effect Verification Annual downtime for maintenance was reduced from 48 hours to 2 hours, and availability increased by 8.3%. The single-cavity structure reduces the equipment weight by 28% and the floor space by 32%. The lifespan of the filter cartridge has been extended from 6 months to 10.8 months (1.8 times). The geothermal water is 100% reused, with no discharge from the site.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A steam purification and recycling device for geothermal power generation, comprising a water pump (1), characterized in that: The water pump (1) is fixedly connected to a water supply pipe (2) on the right side. At least two sets of processing mechanisms (3) that can be used as online backups for each other are fixedly connected to the right side of the water supply pipe (2), one of which is in operation and the other is in standby. The processing mechanism (3) is fixedly connected to a water pipe (4) on the left side. The water pipe (4) is fixedly connected to a control pump (5) on the right side. Each of the aforementioned processing mechanisms (3) includes a processing box (31), a rotating frame (32) is rotatably connected to the inner left side of the processing box (31), a filter cylinder (33) is movably sleeved on the outer side of the rotating frame (32), a mechanism rod (34) is fixedly connected to the inner left side of the processing box (31), a flash evaporator (35) is fixedly connected to the upper side of the mechanism rod (34), and a gas distribution pipe (36) is fixedly connected to the inner left side of the processing box (31). The bottom of the processing box (31) is inclined to the lower right, and the filter cylinder (33), flash evaporator (35) and gas distribution pipe (36) are arranged in the same cavity inside the box. There are no partitions inside, forming a continuous cavity.

2. The steam purification and recycling device for geothermal power generation according to claim 1, characterized in that: A cover plate (37) is fixedly connected to the right side of the processing box (31) via a flange structure. A connecting plate (311) is rotatably connected to the left side of the cover plate (37). A tube (39) is fixedly connected to the left side of the processing box (31). A first insert (310) is fixedly connected to the left side of the processing box (31). Several annularly distributed second inserts (312) are fixedly connected to the left side of the connecting plate (311). A motor (313) is fixedly connected to the right side of the processing box (31). A gear (314) is fixedly connected to the output end of the motor (313). The outer side of the gear (314) is movably sleeved on the inner side of the cover plate (37), and the inner side of the connecting disc (311) is fixedly connected to the gear ring (315). The lower side of the gear (314) is meshed with the bottom of the gear ring (315). The outer side of the insertion tube (39), the outer side of the first insertion block (310), and the outer side of several second insertion blocks (312) are all fixedly connected to rubber sleeves. The cover plate (37) can fix or release the filter cylinder (33), flash evaporator (35), and air distribution pipe (36) at the same time by disassembling and assembling, and allows the filter cylinder (33) to be pulled out axially.

3. The steam purification and recycling device for geothermal power generation according to claim 2, characterized in that: The bottom of the treatment tank (31) is tilted to the lower right. Two liquid level sensors (316) are fixedly connected to the inner left side of the treatment tank (31). A water inlet (317) is opened on the inner left side of the treatment tank (31). An observation window (38) is fixedly connected to the outer wall of the treatment tank (31). The control pump (5) is linked in a closed loop with the upper and lower liquid level sensors (316) to keep the liquid level in the tank constant and realize 100% reuse of geothermal water.

4. The steam purification and recycling device for geothermal power generation according to claim 3, characterized in that: By switching external valves, the geothermal hot water and water supply / drainage circuits can be interchanged between the two treatment units (3), achieving zero-downtime online maintenance of the power station; the external valve group adopts a first-open-then-close sequence, with a switching time of ≤3 minutes, and the power station load remains at 100%.

5. The steam purification and recycling device for geothermal power generation according to claim 4, characterized in that: The motor (313) drives the rotating frame (32) to rotate the filter screen cylinder (33) periodically, so that the filter screen filters evenly around the whole circumference and extends the single maintenance cycle; the rotation speed is continuously adjustable from 0-5 r / min, so that the filter screen bears the filtration load evenly around the whole circumference.

6. The steam purification and recycling device for geothermal power generation according to claim 5, characterized in that: The control pump (5) automatically replenishes or pumps water to the treatment tank (31) according to the signal of the liquid level sensor (316), keeping the liquid level in the tank constant and realizing the closed-loop circulation of geothermal water; all flash condensate is returned to the storage tank and there is no discharge on site.

7. A zero-downtime operation method for geothermal steam purification and recycling using the apparatus described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Start the water pump (1) to send the underground hot water through the water pipe (2) into the processing unit (3) which is in operation, while the other processing unit (3) is in standby position; S2. Hot water enters the clean water zone inside the filter cylinder (33) after being filtered through the filter screen. S3, the flash evaporator (35) instantly depressurizes the hot water in the water purification area and flashes it. The resulting saturated steam is then sent to the steam turbine for power generation via the gas distribution pipe (36) and the insertion pipe (39). S4. The exhaust steam after work is condensed and returned to the water storage tank; S5. When the liquid level in the operating position processing tank (31) is lower than the lower liquid level sensor (316), the control pump (5) automatically replenishes water; when the liquid level is higher than the upper liquid level sensor (316), the control pump (5) pumps water back into the tank to maintain a constant liquid level. S6. The motor (313) periodically drives the filter cylinder (33) to rotate slowly, so that the filter screen participates in filtration evenly around the whole circumference; S7. When maintenance is required, switch the external valve to switch the geothermal hot water and water supply and drainage circuit from the operating position processing mechanism (3) to the standby position processing mechanism (3) to complete the zero-downtime switching. S8. Open the cover plate (37) of the maintenance and treatment mechanism (3), pull out the filter screen cylinder (33) axially for offline cleaning or replacement, and remove the filter residue deposited at the bottom of the inclined box. S9. After maintenance, reinstall the filter screen (33) and close the cover (37). The processing mechanism (3) will enter standby mode again and wait for the next switch. The inlet valve of the standby position is slightly opened by 10% to maintain a temperature difference of ≤3℃ with the operating position to avoid thermal shock.

8. The zero-downtime operation method according to claim 7, characterized in that: The switching step S7 is completed under 100% load of the power station, with a switching time of ≤3 minutes, and the power station does not need to reduce load or shut down during the entire process; the switching trigger condition is that the pressure difference of the observation window is ≥0.05 MPa or the station has been running for 30 days, and the valve timing command is issued by the central control room with one click to complete the automatic switching.

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