Biogas pretreatment device for biogas power generation

Abstract

The utility model relates to the biogas power generation technical field, concretely is a kind of biogas pretreatment device for biogas power generation, including processing jar, the surface cover of processing jar is equipped with sealing jar cover, the inside of processing jar is provided with pretreatment mechanism, the pretreatment mechanism includes gas duct, baffle and sprinkling disc, the inside of processing jar is fixed with sprinkling disc, the above of sprinkling disc is provided with baffle, the above of pretreatment mechanism is provided with turn-back water-removal mechanism, the turn-back water-removal mechanism includes turn-back disc and baffle ring, the inside of processing jar is fixed with baffle ring, the above cover of baffle ring is equipped with turn-back disc, gap is left between the turn-back disc and turn-back disc, the structure of turn-back disc is conical structure.The utility model reduces the contact of water droplet adhered on the surface of turn-back disc and subsequent biogas, improves the water-removal effect of biogas when biogas pretreatment device is used.

Description

Technical Field

[0001] This utility model relates to the field of biogas power generation technology, specifically a biogas pretreatment device for biogas power generation. Background Technology

[0002] Biogas power generation converts the chemical energy in biogas into electrical energy to provide a stable power output for the load. Before converting biogas from chemical energy to electrical energy, it needs to be pretreated. Biogas pretreatment devices are mainly used to pretreat biogas and remove impurities from it.

[0003] A search revealed a utility model patent with patent number 202420413560.9 entitled "A Biogas Pretreatment Device for a Biogas Generator Set". The patent includes a base plate, a desulfurization tank installed on one side of the base plate, an air inlet on one side of the desulfurization tank, an air outlet on the other side of the desulfurization tank, a drain outlet at the bottom of the desulfurization tank, a fixing ring installed on the inner side of the desulfurization tank, and a baffle plate fixed below the fixing ring.

[0004] Research and analysis revealed that during the use of this biogas pretreatment device, the baffle plate is installed above the spray frame via the first bolt. When the biogas reacts with the sodium hydroxide solution, it impacts the baffle plate as it passes through, leaving water droplets on the baffle plate and removing moisture from the gas. This prevents moisture from damaging the biogas pretreatment device and biogas engine unit, and dehydration can also improve the calorific value and combustion efficiency of the biogas. However, the biogas after reacting with the sodium hydroxide solution contains a lot of moisture, and dehydration by the baffle plate alone is not very effective. Moreover, after a period of time, the water remaining on the surface of the baffle plate will come into contact with the biogas that subsequently enters it, reducing the dehydration effect of the biogas. Utility Model Content

[0005] The purpose of this utility model is to provide a biogas pretreatment device for biogas power generation, so as to solve the problem of poor water removal effect of biogas when using the biogas pretreatment device mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a biogas pretreatment device for biogas power generation, comprising a treatment tank, a sealed tank cover covering the surface of the treatment tank, a control button installed on the surface of the sealed tank cover, an exhaust pipe fixed to the surface of the sealed tank cover, an air inlet pipe fixed to one side at the bottom of the treatment tank, a pretreatment mechanism disposed inside the treatment tank, the pretreatment mechanism comprising an air guide pipe, a baffle plate, and a spray plate, the spray plate being fixed inside the treatment tank, an air guide pipe embedded at the center of the spray plate, the two ends of the air guide pipe extending to the outside of the spray plate respectively, a baffle plate being disposed above the spray plate, a deflection dewatering mechanism being disposed above the pretreatment mechanism, the deflection dewatering mechanism comprising a deflection plate and a baffle ring, a baffle ring being fixed inside the treatment tank, the baffle ring being located above the spray plate, a deflection plate being disposed above the baffle ring, a gap being left between the deflection plates, the deflection plate having a conical structure.

[0007] Preferably, the pretreatment mechanism further includes a nozzle, a spiral air guide seat, and a water-passing mesh plate. The water-passing mesh plate is fixed at the bottom of the treatment tank. The spiral air guide seat is fixed between the water-passing mesh plate and the spray plate. A nozzle is installed at the bottom of each spray plate. The input end of the nozzle is electrically connected to the output end of the sealed tank cover. The nozzle is located inside the spiral air guide seat.

[0008] Preferably, the folding water removal mechanism further includes a water absorption mechanism, which consists of Velcro and absorbent cotton. Velcro is circumferentially attached to the inner wall of the folding disc, and absorbent cotton is placed circumferentially on the inner wall of the folding disc. One surface of the absorbent cotton is bonded to the surface of the Velcro.

[0009] Preferably, the water absorption mechanism further includes a pressure roller and a roller frame. The roller frame is provided inside the return plate, and the pressure roller is rotatably connected to the surface of the roller frame. One end of the pressure roller extends to the outside of the return plate, and the surface of the pressure roller is in pressure contact with the surface of the absorbent cotton.

[0010] Preferably, the water absorption mechanism further includes a flow guide cover, which is provided on the outer side of the pressure roller. One end of the flow guide cover is fixedly connected to the surface of the roller frame, and the other end of the flow guide cover extends to the outer side of the retaining ring.

[0011] Preferably, the water absorption mechanism further includes a drive motor and a rotating rod. The drive motor is installed at the center of the surface of the sealing can lid. The input end of the drive motor is electrically connected to the output end of the sealing can lid. The output end of the drive motor is fixed to the rotating rod through a coupling. One end of the rotating rod extends into the interior of the folding disc. The central axis of the rotating rod coincides with the central axis of the folding disc.

[0012] Preferably, the water absorption mechanism further includes a fastening nut and a positioning stud. A positioning stud is fixed at the center of the bottom of the rotating rod. The positioning stud is inserted into the roller frame. The fastening nut is threaded on the surface of the positioning stud. The surface of the fastening nut is in close contact with the surface of the roller frame.

[0013] Preferably, the dewatering mechanism further includes a positioning sleeve and fastening bolts. One end of the dewatering disc is rotatably connected to the positioning sleeve, the positioning sleeve is slidably fitted on the bottom of the rotating rod, and fastening bolts are threadedly connected to both sides of the surface of the positioning sleeve. One end of the fastening bolt passes through the positioning sleeve and is threadedly fastened to the rotating rod.

[0014] Preferably, the water absorption mechanism further includes a flow guiding groove, and the inner wall of the folding disc is provided with a flow guiding groove along the circumference, the flow guiding groove being located between the Velcro straps.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The biogas pretreatment device for biogas power generation is equipped with a deflection and dewatering mechanism and a water suction mechanism. After the biogas enters above the spray plate, it continues to rise and impact the deflection plate. According to the difference in water and gas density, most of the water in the biogas remains on the surface of the deflection plate. After the biogas deflects, it is discharged from the deflection plate along the gap between the deflection plate and the baffle ring. Subsequently, the biogas is further deflected and dewatered under the action of the baffle plate. The dewatered biogas is discharged through the exhaust pipe, thereby realizing the deflection and dewatering function of the biogas pretreatment device and improving the dewatering effect of the biogas when the biogas pretreatment device is used.

[0016] When biogas impacts the return plate, the absorbent cotton absorbs the moisture in the biogas, preventing it from remaining on the return plate surface for extended periods and coming into contact with subsequent biogas. Simultaneously, the drive motor rotates the rotating rod, which in turn rotates the roller frame, causing the pressure roller to rotate along the return plate. This process squeezes the absorbent cotton, causing most of the water inside to drip down the pressure roller to the outside of the retaining ring, some to fall into the guide shroud and then down the guide shroud to the outside of the retaining ring, and a small portion to flow into the guide grooves on both sides of the absorbent cotton and then down the guide grooves to the outside of the retaining ring. This process squeezes and drains the absorbent cotton, facilitating better water absorption by subsequent absorbent cotton. After the biogas pretreatment device is used, the water can be drained through the drain pipe on one side of the retaining ring, thus realizing the water absorption function of the biogas pretreatment device and reducing the contact between water droplets adhering to the return plate surface and subsequent biogas.

[0017] When it is necessary to replace the absorbent cotton, the sealing tank cover can be removed by loosening the screws on the surface of the treatment tank. Then, remove the sealing tank cover from the treatment tank and take out the deflector plate and baffle plate together with the rotating rod. At this time, the fastening nut can be removed by rotating the fastening nut and the positioning stud. Then, the roller frame and pressure roller can be removed. Then, loosen the fastening bolts and separate the deflector plate from the rotating rod. Then flip the deflector plate over and tear off the absorbent cotton for replacement by the adhesion of the absorbent cotton and Velcro. Afterwards, the baffle plate can be removed from the rotating rod by loosening the nut at the bottom of the baffle plate and the baffle plate can be cleaned to realize the function of replacing the absorbent cotton in the biogas pretreatment device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model; Figure 3 This is a top view enlarged cross-sectional schematic diagram of the folding disc of this utility model; Figure 4 This is a partially enlarged structural diagram of the water absorption mechanism of this utility model.

[0019] In the diagram: 1. Treatment tank; 11. Sealed tank cover; 12. Control button; 13. Exhaust pipe; 14. Air inlet pipe; 2. Pretreatment mechanism; 21. Air guide pipe; 22. Baffle plate; 23. Spray plate; 24. Nozzle; 25. Spiral air guide seat; 26. Water-passing mesh plate; 3. Deflecting water removal mechanism; 31. Deflecting plate; 32. Positioning sleeve; 33. Fastening bolt; 34. Retaining ring; 4. Water suction mechanism; 41. Drive motor; 42. Velcro; 43. Guide groove; 44. Pressure roller; 45. Guide cover; 46. Absorbent cotton; 47. Fastening nut; 48. Positioning stud; 49. Roller frame; 410. Rotating rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0021] The structure of the biogas pretreatment device for biogas power generation provided by this utility model is as follows: Figure 1 and Figure 2 As shown, the device includes a treatment tank 1. A drain pipe is installed at the bottom of the treatment tank 1 for draining liquid. The drain pipe consists of a drain pipe fixed to the bottom of the treatment tank 1 and a valve installed on the surface of the drain pipe. A sealing tank cover 11 is provided on the surface of the treatment tank 1. The sealing tank cover 11 is detachably connected to the treatment tank 1 by screws. The treatment tank 1 and the sealing tank cover 11 are sealed together. A control button 12 is installed on the surface of the sealing tank cover 11. The control button 12 can be of the LA series. An exhaust pipe 13 is fixed on the surface of the sealing tank cover 11. An air inlet pipe 14 is fixed on one side at the bottom of the treatment tank 1.

[0022] Furthermore, such as Figure 2 As shown, the treatment tank 1 is equipped with a pretreatment mechanism 2, which includes a gas guide pipe 21, a baffle plate 22, and a spray plate 23. The spray plate 23 is fixed inside the treatment tank 1. One end of the spray plate 23 is fitted with an inlet pipe for introducing sodium hydroxide solution. The gas guide pipe 21 is embedded in the center of the spray plate 23, with both ends extending to the outside of the spray plate 23. A baffle plate 22 is positioned above the spray plate 23, below the exhaust pipe 13. The pretreatment mechanism 2 also includes a spray... The treatment tank 1 has a head 24, a spiral air guide seat 25, and a water-passing mesh plate 26. The water-passing mesh plate 26 is fixed at the bottom of the treatment tank 1. The water-passing mesh plate 26 is located above the drain pipe. The spiral air guide seat 25 is fixed between the water-passing mesh plate 26 and the spray plate 23. The inlet of the spiral air guide seat 25 is located on one side of the air inlet pipe 14. The bottom of the spray plate 23 is equipped with a nozzle 24. The nozzle 24 can be of the SK series. The input end of the nozzle 24 is electrically connected to the output end of the control button 12. The nozzle 24 is located inside the spiral air guide seat 25.

[0023] In use, the biogas to be treated enters the inlet of the spiral air guide seat 25 through the air inlet pipe 14. At the same time, a sodium hydroxide solution is introduced into the spray plate 23 by a water pump, and the solution is sprayed through the nozzle 24, so that the sodium hydroxide solution mixes and reacts with the biogas to perform desulfurization. At this time, the biogas flows spirally along the spiral air guide seat 25. Under the action of the spiral air guide seat 25, the travel time of the biogas is extended, so that the biogas can fully react with the sodium hydroxide solution. The reacted solution falls into the bottom of the treatment tank 1 through the water-passing mesh plate 26 and is discharged through the drain pipe at the bottom of the treatment tank 1. The reacted biogas enters the area above the spray plate 23 through the air guide pipe 21 to realize the desulfurization function of the biogas pretreatment device.

[0024] Furthermore, such as Figure 2 and Figure 4 As shown, a dewatering mechanism 3 is provided above the pretreatment mechanism 2. The dewatering mechanism 3 includes a dewatering disc 31 and a retaining ring 34. The retaining ring 34 is fixed inside the treatment tank 1 and is located above the spray disc 23. A drain pipe for drainage is installed on one side of the retaining ring 34. The drain pipe consists of a drain pipe fixed at the junction of the treatment tank 1 and the retaining ring 34 and a valve installed on the surface of the drain pipe. The dewatering disc 31 is covered on the top of the retaining ring 34. There is a gap between the dewatering discs 31. The dewatering disc 31 has a conical structure. The dewatering mechanism 3 also includes a positioning sleeve 32 and a fastening bolt 33. The positioning sleeve 32 is rotatably connected to one end of the dewatering disc 31. The positioning sleeve 32 is slidably fitted on the bottom of the rotating rod 410. Fastening bolts 33 are threadedly connected to both sides of the surface of the positioning sleeve 32. One end of the fastening bolt 33 passes through the positioning sleeve 32 and is threadedly fastened to the rotating rod 410.

[0025] In use, biogas enters above the spray plate 23 and continues to rise, impacting the return plate 31. Due to the different water-gas densities, most of the water in the biogas remains on the surface of the return plate 31. After the biogas returns, it is discharged from the return plate 31 through the gap between the return plate 31 and the baffle ring 34. Subsequently, the biogas is further deflected and dewatered under the action of the baffle plate 22. The dewatered biogas is discharged through the exhaust pipe 13 to realize the return and dewatering function of the biogas pretreatment device.

[0026] Furthermore, such as Figure 3 and Figure 4As shown, the dewatering mechanism 3 also includes a water absorption mechanism 4, which consists of Velcro 42 and absorbent cotton 46. Velcro 42 is circumferentially attached to the inner wall of the folding disc 31, and absorbent cotton 46 is placed circumferentially on the inner wall of the folding disc 31. One side of the absorbent cotton 46 is bonded to the surface of the Velcro 42. The water absorption mechanism 4 also includes a pressure roller 44 and a roller frame 49. The roller frame 49 is provided inside the folding disc 31, and the pressure roller 44 is rotatably connected to the surface of the roller frame 49. One end of the pressure roller 44 extends to the outside of the return plate 31. The surface of the pressure roller 44 is in contact with the surface of the absorbent cotton 46. The water absorption mechanism 4 also includes a guide shroud 45. The outer side of the pressure roller 44 is covered by the guide shroud 45. One end of the guide shroud 45 is fixedly connected to the surface of the roller frame 49. The other end of the guide shroud 45 extends to the outside of the retaining ring 34. The water absorption mechanism 4 also includes a drive motor 41 and a rotating rod 410. The drive motor 41 is installed at the center of the surface of the sealing tank cover 11. The model of the drive motor 41 can be JO series. The input end of the drive motor 41 is electrically connected to the output end of the control button 12. The output end of the drive motor 41 is fixed to the rotating rod 410 through a coupling. One end of the rotating rod 410 extends into the interior of the return plate 31. The central axis of the rotating rod 410 coincides with the central axis of the return plate 31. The water absorption mechanism 4 also includes a fastening nut 47 and a positioning stud 48. The positioning stud 48 is fixed at the center of the bottom of the rotating rod 410. The positioning stud 48 and the roller frame 49 are interlocked and fitted together. The surface of the positioning stud 48 is threaded with a fastening nut 47. The surface of the fastening nut 47 is in close contact with the surface of the roller frame 49. The water absorption mechanism 4 also includes a guide groove 43. The inner wall of the return plate 31 is provided with a guide groove 43 along the circumference. The guide groove 43 is located between the Velcro 42, so that when the pressure roller 44 squeezes the absorbent cotton 46, the water at the edge of the absorbent cotton 46 flows along the guide groove 43 to the outside of the retaining ring 34.

[0027] In use, when biogas impacts the return plate 31, the absorbent cotton 46 absorbs the moisture in the biogas, preventing it from remaining on the surface of the return plate 31 for an extended period and then coming into contact with subsequent biogas. Simultaneously, the drive motor 41 rotates the rotating rod 410, causing the roller frame 49 to rotate synchronously, which in turn rotates the pressure roller 44 along the return plate 31, sequentially squeezing the absorbent cotton 46. This causes most of the water inside the absorbent cotton 46 to drip down the pressure roller 44 to the outside of the retaining ring 34, with some falling to the outside. The water flows inside the guide hood 45 and falls along the guide hood 45 to the outside of the baffle ring 34. A small portion flows into the guide grooves 43 on both sides of the absorbent cotton 46 and falls along the guide grooves 43 to the outside of the baffle ring 34, squeezing and draining the absorbent cotton 46, which facilitates better water absorption by the absorbent cotton 46 in the future. After the biogas pretreatment device is used, the water can be discharged through the drain pipe on one side of the baffle ring 34 to realize the water absorption function of the biogas pretreatment device and reduce the contact between the water droplets attached to the surface of the return plate 31 and the subsequent biogas.

[0028] When it is necessary to replace the absorbent cotton 46, the sealing tank cover 11 can be removed by loosening the screws on the surface of the treatment tank 1. Then, the sealing tank cover 11 can be removed from the treatment tank 1, and the deflector plate 31 and the baffle plate 22 can be removed together with the rotating rod 410. At this time, the fastening nut 47 can be removed by rotating the fastening nut 47. Under the thread engagement between the fastening nut 47 and the positioning stud 48, the fastening nut 47 can be removed. Then, the roller frame 49 and the pressure roller 44 can be removed. Then, the fastening bolt 33 can be loosened to separate the deflector plate 31 from the rotating rod 410. Then, the deflector plate 31 can be flipped over. Under the adhesive action of the absorbent cotton 46 and the Velcro 42, the absorbent cotton 46 can be torn off for replacement. Then, the baffle plate 22 can be removed from the rotating rod 410 by loosening the nut at the bottom of the baffle plate 22 and the baffle plate 22 can be cleaned to realize the function of replacing the absorbent cotton 46 in the biogas pretreatment device.

[0029] Working principle: In use, the biogas pretreatment device is first started by operating the control button 12. The biogas to be treated enters the inlet of the spiral air guide seat 25 through the air inlet pipe 14. At the same time, a sodium hydroxide solution is introduced into the spray plate 23 by a water pump and sprayed through the nozzle 24. The sodium hydroxide solution mixes and reacts with the biogas to remove sulfur from the biogas. At this time, the biogas flows spirally along the spiral air guide seat 25. The spiral air guide seat 25 prolongs the travel time of the biogas, allowing it to react fully with the sodium hydroxide solution. The reacted solution falls into the bottom of the treatment tank 1 through the water filter plate 26 and is discharged through the drain pipe at the bottom of the treatment tank 1. The reacted biogas enters the area above the spray plate 23 through the air guide pipe 21 to realize the desulfurization function of the biogas pretreatment device.

[0030] Subsequently, the biogas enters above the spray plate 23 and continues to rise, impacting the return plate 31. Due to the difference in water and gas density, most of the water in the biogas remains on the surface of the return plate 31. After returning, the biogas exits through the gap between the return plate 31 and the baffle ring 34. Then, under the action of the baffle plate 22, the biogas is further deflected and dewatered. The dewatered biogas is discharged through the exhaust pipe 13, thus realizing the return and dewatering function of the biogas pretreatment device and improving the dewatering effect of the biogas when the biogas pretreatment device is in use.

[0031] When biogas impacts the return plate 31, the absorbent cotton 46 absorbs the moisture in the biogas, preventing it from remaining on the surface of the return plate 31 for an extended period and coming into contact with subsequent biogas. Simultaneously, the drive motor 41 rotates the rotating rod 410, causing the roller frame 49 to rotate synchronously. This, in turn, causes the pressure roller 44 to rotate along the return plate 31, sequentially squeezing the absorbent cotton 46. This causes most of the water inside the absorbent cotton 46 to drip along the pressure roller 44 onto the outside of the retaining ring 34, with some falling into the guide. The water flows into the inside of the cover 45 and falls along the guide cover 45 to the outside of the baffle ring 34. A small portion flows into the guide grooves 43 on both sides of the absorbent cotton 46 and falls along the guide grooves 43 to the outside of the baffle ring 34, squeezing and draining the absorbent cotton 46 to facilitate better water absorption by the absorbent cotton 46 in the future. After the biogas pretreatment device is used, the water can be discharged through the drain pipe on one side of the baffle ring 34 to realize the water absorption function of the biogas pretreatment device and reduce the contact between the water droplets attached to the surface of the return plate 31 and the subsequent biogas.

[0032] When it is necessary to replace the absorbent cotton 46, the sealing tank cover 11 can be removed by loosening the screws on the surface of the treatment tank 1. Then, the sealing tank cover 11 can be removed from the treatment tank 1, and the deflector plate 31 and the baffle plate 22 can be removed together with the rotating rod 410. At this time, the fastening nut 47 can be removed by rotating the fastening nut 47 and the positioning stud 48. Then, the roller frame 49 and the pressure roller 44 can be removed. Then, the fastening bolt 33 can be loosened to separate the deflector plate 31 from the rotating rod 410. Then, the deflector plate 31 can be flipped over, and the absorbent cotton 46 can be torn off and replaced by the adhesive action of the absorbent cotton 46 and the Velcro 42. Then, the baffle plate 22 can be removed from the rotating rod 410 by loosening the nut at the bottom of the baffle plate 22 and the baffle plate 22 can be cleaned to realize the function of replacing the absorbent cotton 46 of the biogas pretreatment device, and finally complete the use of the biogas pretreatment device.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A biogas pretreatment device for biogas power generation, comprising a treatment tank (1), characterized in that: The surface of the treatment tank (1) is covered with a sealing tank cover (11), and a control button (12) is installed on the surface of the sealing tank cover (11). An exhaust pipe (13) is fixed on the surface of the sealing tank cover (11). An air inlet pipe (14) is fixed on one side of the bottom of the treatment tank (1). A pretreatment mechanism (2) is provided inside the treatment tank (1). The pretreatment mechanism (2) includes an air guide pipe (21), a baffle plate (22), and a spray plate (23). The spray plate (23) is fixed inside the treatment tank (1), and an air guide pipe (21) is embedded in the center of the spray plate (23). The two ends of the air guide pipe (21) extend to the outside of the spray plate (23). A baffle plate (22) is provided above the spray plate (23). A deflection dewatering mechanism (3) is provided above the pretreatment mechanism (2). The deflection dewatering mechanism (3) includes a deflection plate (31) and a baffle ring (34). A baffle ring (34) is fixed inside the treatment tank (1). The baffle ring (34) is located above the spray plate (23). A deflection plate (31) is covered above the baffle ring (34). A gap is left between the deflection plate (31) and the deflection plate (31). The deflection plate (31) has a conical structure.

2. The biogas pretreatment device for biogas power generation according to claim 1, characterized in that: The pretreatment mechanism (2) also includes a nozzle (24), a spiral air guide seat (25), and a water-passing mesh plate (26). The water-passing mesh plate (26) is fixed at the bottom of the treatment tank (1). The spiral air guide seat (25) is fixed between the water-passing mesh plate (26) and the spray plate (23). The bottom of the spray plate (23) is equipped with a nozzle (24). The input end of the nozzle (24) is electrically connected to the output end of the control button (12). The nozzle (24) is located inside the spiral air guide seat (25).

3. The biogas pretreatment device for biogas power generation according to claim 1, characterized in that: The folding water removal mechanism (3) also includes a water absorption mechanism (4), which is composed of Velcro (42) and absorbent cotton (46). Velcro (42) is glued to the inner wall of the folding disc (31) in the circumferential direction, and absorbent cotton (46) is placed on the inner wall of the folding disc (31) in the circumferential direction. The surface of one side of the absorbent cotton (46) is bonded to the surface of the Velcro (42).

4. A biogas pretreatment device for biogas power generation according to claim 3, characterized in that: The water absorption mechanism (4) also includes a pressure roller (44) and a roller frame (49). The roller frame (49) is provided inside the return plate (31). The pressure roller (44) is rotatably connected to the surface of the roller frame (49). One end of the pressure roller (44) extends to the outside of the return plate (31). The surface of the pressure roller (44) is in contact with the surface of the absorbent cotton (46).

5. A biogas pretreatment device for biogas power generation according to claim 4, characterized in that: The water absorption mechanism (4) also includes a flow guide (45), the outer side of the pressure roller (44) is covered with the flow guide (45), one end of the flow guide (45) is fixedly connected to the surface of the roller frame (49), and the other end of the flow guide (45) extends to the outer side of the retaining ring (34).

6. A biogas pretreatment device for biogas power generation according to claim 5, characterized in that: The water absorption mechanism (4) also includes a drive motor (41) and a rotating rod (410). The drive motor (41) is installed at the center of the surface of the sealed tank cover (11). The input end of the drive motor (41) is electrically connected to the output end of the control button (12). The output end of the drive motor (41) is fixed to the rotating rod (410) through a coupling. One end of the rotating rod (410) extends into the interior of the return plate (31). The central axis of the rotating rod (410) coincides with the central axis of the return plate (31).

7. A biogas pretreatment device for biogas power generation according to claim 6, characterized in that: The water absorption mechanism (4) also includes a fastening nut (47) and a positioning stud (48). The positioning stud (48) is fixed at the center of the bottom of the rotating rod (410). The positioning stud (48) and the roller frame (49) are interlocked. The fastening nut (47) is threaded on the surface of the positioning stud (48). The surface of the fastening nut (47) is in close contact with the surface of the roller frame (49).

8. A biogas pretreatment device for biogas power generation according to claim 6, characterized in that: The dewatering mechanism (3) further includes a positioning sleeve (32) and a fastening bolt (33). The positioning sleeve (32) is rotatably connected to one end of the dewatering disc (31). The positioning sleeve (32) is slidably sleeved on the bottom of the rotating rod (410). Fastening bolts (33) are threadedly connected to both sides of the surface of the positioning sleeve (32). One end of the fastening bolt (33) passes through the positioning sleeve (32) and is threadedly fastened to the rotating rod (410).

9. A biogas pretreatment device for biogas power generation according to claim 3, characterized in that: The water absorption mechanism (4) also includes a flow guide groove (43), and the inner wall of the folding disc (31) is provided with a flow guide groove (43) along the circumferential direction. The flow guide groove (43) is located between the Velcro (42).

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