Biogas treatment device and method for purifying biogas

Abstract

The invention relates to the technical field of marsh gas treatment, and discloses a marsh gas treatment device and method for marsh gas purification, the marsh gas treatment device comprises a marsh gas treatment device body, a driving motor is arranged in the marsh gas treatment device body, and a driving rod driven by the driving motor is arranged in the marsh gas treatment device body; a first-stage gas filtering part and a second-stage gas filtering part which are used for purifying biogas are respectively arranged at two ends of the driving rod, and the first-stage gas filtering part is connected with the second-stage gas filtering part through a rubber hose. The number of rolling turns of the rolled permeable membrane can be changed through swinging of a poke rod and under the extrusion action of a first reset spring and a second reset spring on the two sides, so that the number of layers for filtering carbon dioxide can be changed, the purity of methane in biogas is improved, and meanwhile, through rolling of the permeable membrane, the carbon dioxide can be effectively filtered. The inner diameter of the rolled permeable membrane can also be reduced, and the pressure can also be increased, so that a high-pressure environment is provided for removing carbon dioxide.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas treatment, and in particular to a biogas treatment device and method for biogas purification. Background Art

[0002] Biogas purification refers to the process of removing impurities from biogas and increasing the methane content to achieve higher quality standards. Biogas usually contains a large amount of carbon dioxide, so the corresponding carbon dioxide needs to be removed. Conventional methods for removing carbon dioxide from biogas use a combination of methods, such as absorption, pressure swing adsorption, low-temperature condensation, and membrane separation to achieve the separation of carbon dioxide from biogas. The following problems usually occur in the process of biogas purification:

[0003] In the process of biogas pressurization, additional auxiliary equipment is required. Only the gas is pressurized to allow the high-pressure gas to pass through the corresponding device. This will only allow the airflow to have a one-time pressurization process without filtering the biogas multiple times. This will cause a large amount of carbon dioxide to remain in the filtered biogas. At the same time, the pressurized airflow is also affected by the diameter of the pipe when passing through the internal process of the device. When passing through a pipe with a larger diameter, the gas pressure is reduced, and the purification efficiency is affected.

[0004] To this end, we designed a biogas treatment device and method for biogas purification. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the air flow is pressurized once without filtering the biogas multiple times, which will result in a large amount of carbon dioxide remaining in the filtered biogas; the pressurized air flow is also affected by the diameter of the pipe when passing through the internal process of the device. When passing through a pipe with a larger diameter, the gas pressure is reduced, and the purification efficiency is affected. A biogas treatment device and method for biogas purification are proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A biogas treatment device for biogas purification, comprising a biogas treatment device body, a drive motor disposed within the biogas treatment device body, a drive rod driven by the drive motor disposed within the biogas treatment device body, a primary air filter portion and a secondary air filter portion for purifying biogas disposed at each end of the drive rod, the primary air filter portion being connected to the secondary air filter portion via a rubber hose;

[0008] The primary air filter portion includes a telescopic piston that penetrates and slides telescopically on the side wall of the biogas treatment device body. The biogas treatment device body is provided with an air intake cylinder and a baffle ring that are coaxially arranged with the telescopic piston. The air intake cylinder is provided with an air intake hole, and a one-way valve is provided in the air intake hole. The air intake cylinder is also provided with an electric exhaust valve. The telescopic piston is also provided with an adsorbent for adsorbing carbon dioxide in the biogas. The telescopic piston is provided with an internal hole and a side wall hole for discharging the biogas to the secondary air filter portion.

[0009] The secondary air filtration part includes a permeable membrane, which is in a rolled-up shape. The rolled-up permeable membrane is coaxially provided with an air intake rod, and the side wall of the air intake rod is provided with multiple inclined holes. The biogas is discharged from the inclined holes on the side wall of the air intake rod. The two ends of the rolled-up permeable membrane are respectively tightly attached to the first side wall baffle and the second side wall baffle, and the second side wall baffle is provided with multiple air outlet holes, and a pressure valve is provided in the air outlet hole.

[0010] Preferably, the primary air filter unit further includes:

[0011] A mounting ring groove is provided on the outer side wall of the telescopic piston, and a half-ring magnet is fixedly provided in the mounting ring groove;

[0012] The side wall cavity is opened on the side wall of the air inlet cylinder, an exhaust hole is opened on the blocking hole ring, a lifting magnet is slid in the side wall cavity to block the exhaust hole, and a sealing strip is provided on the outer wall of the lifting magnet.

[0013] Preferably, the internal hole and the side wall hole are arranged perpendicular to each other, the side wall holes are arranged in multiple numbers and are arranged linearly along the radial direction, the side wall holes are located below the mounting ring groove, an installation cavity is opened at the top of the telescopic piston, and the adsorbent is installed in the installation cavity.

[0014] Preferably, a first swing rod is fixed to one end of the driving rod, a bottom pillow block is fixed to the bottom of the telescopic piston, and the bottom pillow block is connected to the other end of the first swing rod through a second swing rod.

[0015] Preferably, a rotating disk is coaxially fixed to the other end of the driving rod, and a plurality of radial sliding holes are circumferentially opened on the rotating disk, and a telescopic block slides on the radial sliding hole, and the telescopic block is connected to the outer side wall of the driving rod by a fourth reset spring, and a telescopic rack slides in the body of the biogas treatment device, one end of the telescopic rack is reset and retracted by a third reset spring, and an end plate is fixed to the other end.

[0016] Preferably, a bracket is fixed in the body of the biogas treatment device, and an air intake rod is fixed on the bracket, a rotating frame is rotated on the air intake rod, and a lifting block that slides through a bar-shaped sliding hole is provided on the rotating frame. A rotating gear is coaxially provided on the air intake rod, and the rotating gear is connected to the rotating frame through a connecting rod, and the telescopic rack is engaged with the rotating gear.

[0017] Preferably, a first axial cavity and a second axial cavity are coaxially opened on the air intake rod, the first axial cavity is connected to the second axial cavity through a connecting hole, a through jack is opened on the air intake rod, and the inclined hole is connected to the second axial cavity.

[0018] Preferably, a first side wall baffle is provided on the other side of the rolled-up permeable membrane, the first side wall baffle and the second side wall baffle are respectively against the two sides of the rolled-up permeable membrane, and the air intake rod passes through the first side wall baffle and the second side wall baffle, an exhaust pipe is coaxially arranged on the second side wall baffle, the first side wall baffle and the bracket are respectively provided with a first fixed plate and a second fixed plate, and the first fixed plate and the second fixed plate are connected by a connecting plate passing through the strip-shaped sliding hole.

[0019] Preferably, a toggle rod is passed through one end of the rolled-up permeable membrane, and the toggle rod is inserted into the lifting block. The lifting block slides in the strip-shaped sliding hole through the first return spring. An insertion rod is inserted into the insertion hole, and the insertion rod is fixed to the other end of the permeable membrane, and a second return spring is provided on the outer wall of the insertion rod. Both the first return spring and the second return spring are in a compressed state.

[0020] A method for a biogas treatment device for biogas purification, comprising the following specific steps:

[0021] S1: First, the drive motor is turned on, causing the drive motor to rotate the drive rod, and the primary and secondary air filter parts at both ends of the drive rod are driven to operate. One end of the drive rod drives the telescopic piston to move through the swinging first and second swing rods. The lifting of the telescopic piston compresses the gas.

[0022] S2: When the telescopic piston is lifted, it will lift up with the half ring magnet in the mounting ring groove and attract the half ring magnet to lift up together;

[0023] When the biogas is pressurized, the carbon dioxide in it is adsorbed in the adsorbent on the top of the telescopic piston. When the telescopic piston continues to rise, it will also lift the lifting magnet. Since the side wall hole is located below the mounting ring groove, when the exhaust hole is opened, the side wall hole is connected to the exhaust hole, so methane, a weakly adsorbed gas, will be discharged from the exhaust hole as purified gas.

[0024] S3: As the telescopic piston continues to rise, the half-ring magnet just passes the top of the lifting magnet and is located above the lifting magnet, so a repulsion phenomenon occurs. At this time, the lifting magnet will fall under the action of repulsion and block the exhaust hole again, and also block the side wall hole. Then, when the telescopic piston descends, negative pressure will be formed above the telescopic piston. At this time, the gas originally adsorbed in the adsorbent will be released under the negative pressure environment;

[0025] S4: The gas discharged from the exhaust hole will enter the first shaft cavity in the air intake rod through the rubber hose. By adjusting the speed of the drive motor, the speed of the rotating disk will be adjusted, and the speed will be adjusted to drive the telescopic rack to move left and right;

[0026] S5: As the telescopic rack and the rotating gear mesh with each other, the rotating gear will be driven to rotate forward and reverse. At the same time, the gas will be discharged from the permeable membrane. The gas entering from the first axial cavity will pass through the connecting hole to the second axial cavity, and then be discharged from the inclined hole. The permeation rate of carbon dioxide is fast, and it is discharged as fast gas through the permeable membrane; the permeation rate of methane is slow, and it passes through the pressure valve in the outlet hole as slow gas, and then is discharged from the exhaust pipe.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention utilizes the lifting and lowering of the telescopic piston. When the telescopic piston reaches the top of the air inlet cylinder, the half-ring magnet in the mounting ring groove just passes over the top of the lifting magnet and is located above the lifting magnet, causing repulsion. The lifting magnet then falls under the action of repulsion and re-blocks the exhaust hole, while also blocking the sidewall hole. Then, as the telescopic piston descends, negative pressure is formed above the telescopic piston. At this time, the gas originally adsorbed in the adsorbent is released under the negative pressure environment, thereby achieving adsorbent regeneration. To ensure continuous gas processing, the initial separation of methane and carbon dioxide in the biogas is also completed.

[0029] 2. The present invention changes the number of windings of the rolled-up permeable membrane by the swing of the toggle lever and the squeezing action of the first and second return springs on both sides, thereby changing the number of layers for carbon dioxide filtration, thereby improving the purity of methane in biogas and completing the secondary separation of methane and carbon dioxide in biogas. At the same time, by winding up the permeable membrane, the inner diameter of the rolled-up permeable membrane can be reduced, and the pressure can also be increased, providing a high-pressure environment for removing carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a biogas treatment device for biogas purification proposed by the present invention;

[0031] Figure 2This is a schematic structural diagram of a first-stage gas filter section in a biogas treatment device for biogas purification proposed by the present invention;

[0032] Figure 3 This is a schematic structural diagram of a telescopic piston in a biogas processing device for biogas purification proposed by the present invention;

[0033] Figure 4 This is a schematic structural diagram of a secondary gas filter section in a biogas treatment device for biogas purification proposed by the present invention;

[0034] Figure 5 for Figure 4 A schematic diagram of the structure at point A in the middle;

[0035] Figure 6 This is a partial exploded view of the secondary gas filter portion of a biogas treatment device for biogas purification proposed in the present invention;

[0036] Figure 7 This is a structural schematic diagram of an air inlet rod in a biogas processing device for biogas purification proposed by the present invention;

[0037] Figure 8 This is a schematic diagram of the interior of an air inlet rod in a biogas processing device for biogas purification proposed by the present invention;

[0038] Figure 9 This is a schematic diagram of a first state of a primary gas filter portion in a biogas treatment device for biogas purification proposed by the present invention;

[0039] Figure 10 for Figure 9 A magnified schematic diagram of the structure at B in the middle;

[0040] Figure 11 This is a schematic diagram of a second state of a primary gas filter portion in a biogas treatment device for biogas purification proposed by the present invention;

[0041] Figure 12 for Figure 11 A magnified schematic diagram of the structure at C in the middle;

[0042] Figure 13 This is a schematic diagram of a third state of a primary gas filter portion in a biogas treatment device for biogas purification proposed by the present invention;

[0043] Figure 14 for Figure 13 A magnified schematic diagram of the structure at D in the middle;

[0044] Figure 15 This is a schematic diagram of a fourth state of a primary gas filter portion in a biogas treatment device for biogas purification proposed by the present invention;

[0045] Figure 16for Figure 15 Enlarged schematic diagram of the structure at E in the middle.

[0046] In the figure: 1, biogas treatment device body; 2, air inlet cylinder; 3, baffle ring; 4, telescopic piston; 5, air inlet; 6, driving rod; 7, rotating disk; 8, telescopic rack; 9, rotating gear; 10, air inlet rod; 11, permeable membrane; 12, exhaust pipe; 13, first swing rod; 14, second swing rod; 15, bottom pillow block; 16, internal hole; 17, side wall hole; 18, adsorbent; 19, exhaust hole; 20, side wall cavity; 21, mounting ring groove; 22, half ring magnet; 23, lifting magnet; 2 4. First side wall baffle; 25. Bracket; 26. Rotating frame; 27. First axial cavity; 28. First fixed plate; 29. ​​Second fixed plate; 30. Lifting block; 31. First return spring; 32. Toggle rod; 33. Connecting rod; 34. Second side wall baffle; 35. Air outlet; 36. Second axial cavity; 37. Connecting hole; 38. Insertion hole; 39. Insertion rod; 40. Second return spring; 41. Inclined hole; 42. Third return spring; 43. End plate; 44. Radial sliding hole; 45. Telescopic block. DETAILED DESCRIPTION

[0047] Reference Figures 1-16 A biogas treatment device for biogas purification includes a biogas treatment device body 1. A drive motor is provided in the biogas treatment device body 1. First, the drive motor is turned on to drive the drive rod 6 to rotate, and the first-level air filter part and the second-level air filter part at both ends of the drive rod 6 are driven to run.

[0048] A driving rod 6 driven by a driving motor is provided in the biogas treatment device body 1. The two ends of the driving rod 6 are respectively provided with a primary air filter part and a secondary air filter part for purifying biogas. The primary air filter part is connected to the secondary air filter part through a rubber hose.

[0049] A first swing rod 13 is fixed to one end of the driving rod 6, and a bottom pillow block 15 is fixed to the bottom of the telescopic piston 4. The bottom pillow block 15 is connected to the other end of the first swing rod 13 through the second swing rod 14. One end of the driving rod 6 drives the telescopic piston 4 to move through the swinging first swing rod 13 and the second swing rod 14, that is, the telescopic piston 4 continuously rises and falls in the air intake cylinder 2.

[0050] The first-stage air filter part includes a telescopic piston 4, which slides telescopically through the side wall of the biogas treatment device body 1. The biogas treatment device body 1 is provided with an air intake cylinder 2 and a baffle ring 3 coaxially arranged with the telescopic piston 4. An air intake hole 5 is opened on the air intake cylinder 2, and a one-way valve is provided in the air intake hole 5. The one-way valve is provided in the air intake hole 5, and biogas can only flow from the outside to the air intake cylinder 2.

[0051] During the upward lifting of the telescopic piston 4, the gas is squeezed by the telescopic piston 4, and the internal hole 16 and the side wall hole 17 that are interconnected are blocked by the blocking ring 3. Therefore, the gas at this time cannot be discharged and can only be compressed as the telescopic piston 4 is lifted.

[0052] The first-stage air filter part also includes a mounting ring groove 21, which is provided on the outer side wall of the telescopic piston 4, and a half-ring magnet 22 is fixedly arranged in the mounting ring groove 21. When the telescopic piston 4 is lifted, the half-ring magnet 22 in the mounting ring groove 21 will be lifted together. The side of the half-ring magnet 22 facing the lifting magnet 23 is S-level, the bottom of the lifting magnet 23 is S-level, and the top is N-level, so that when the telescopic piston 4 is lifted, it will attract the half-ring magnet 22 to lift together.

[0053] The first-stage air filter section also includes a side wall cavity 20, which is opened on the side wall of the air inlet cylinder 2, and an exhaust hole 19 is opened on the blocking hole ring 3. A lifting magnet 23 is sliding in the side wall cavity 20 to block the exhaust hole 19, and a sealing strip is provided on the outer wall of the lifting magnet 23. An electric exhaust valve is also provided on the air inlet cylinder 2, and an adsorbent 18 for adsorbing carbon dioxide in biogas is also provided on the telescopic piston 4. The telescopic piston 4 is provided with an internal hole 16 and a side wall hole 17 for discharging biogas to the secondary air filter section. The internal hole 16 and the side wall hole 17 are arranged perpendicular to each other. There are multiple side wall holes 17 and they are arranged linearly in the radial direction. The side wall hole 17 is located below the mounting ring groove 21. A mounting cavity is opened on the top of the telescopic piston 4, and the adsorbent 18 is installed in the mounting cavity.

[0054] When the biogas is pressurized, the carbon dioxide therein is adsorbed in the adsorbent 18 on the top of the telescopic piston 4. When the telescopic piston 4 continues to rise, it will lift the lifting magnet 23 together. Since the side wall hole 17 is located below the mounting ring groove 21, when the exhaust hole 19 is opened, the side wall hole 17 is connected to the exhaust hole 19, so methane, a weakly adsorbable gas, will be discharged from the exhaust hole 19 as purified gas.

[0055] As the telescopic piston 4 continues to rise, the telescopic piston 4 reaches the top of the air intake cylinder 2. At this time, the semi-ring magnet 22 in the mounting ring groove 21 also just passes over the top of the lifting magnet 23 and is located above the lifting magnet 23. Therefore, a repulsion phenomenon will occur. At this time, the lifting magnet 23 will fall under the action of the repulsive force and block the exhaust hole 19 again, and also block the side wall hole 17. Then, when the telescopic piston 4 descends, a negative pressure will be formed above the telescopic piston 4. At this time, the gas originally adsorbed in the adsorbent 18 will be released under the negative pressure environment, thereby realizing the regeneration of the adsorbent and completing the preliminary separation of methane and carbon dioxide in the biogas.

[0056] In order to ensure continuous processing of the gas, it is necessary to open the electric exhaust valve through the external control device after a period of use to discharge the carbon dioxide in the air intake cylinder 2 to facilitate the subsequent continuous separation of the gas.

[0057] The gas exhausted from the exhaust hole 19 enters the first shaft cavity 27 in the intake rod 10 through the rubber hose.

[0058] The other end of the driving rod 6 is coaxially fixed with a rotating disk 7, and a plurality of radial sliding holes 44 are opened on the rotating disk 7 in a circumferential manner, and a telescopic block 45 slides on the radial sliding hole 44, and the telescopic block 45 is connected to the outer wall of the driving rod 6 by a fourth return spring. A telescopic rack 8 slides in the biogas treatment device body 1, and one end of the telescopic rack 8 is reset and retracted by the third return spring 42, and an end plate 43 is fixed to the other end. By adjusting the speed of the driving motor, the speed of the rotating disk 7 can be adjusted, so the telescopic block 45 on the rotating disk 7 will slide on the radial sliding hole 44. The faster the speed, the telescopic block 45 will push the telescopic rack 8 to move toward the left. When the speed decreases, the telescopic rack 8 moves to the right under the action of the third return spring 42. Therefore, by adjusting the speed of the rotating disk 7, the telescopic block 45 pushes and the reset action of the fourth return spring is achieved, thereby driving the telescopic rack 8 to move left and right.

[0059] A bracket 25 is fixed in the body 1 of the biogas treatment device, and an air intake rod 10 is fixed on the bracket 25. A first axial cavity 27 and a second axial cavity 36 are coaxially provided on the air intake rod 10. The first axial cavity 27 is connected to the second axial cavity 36 through a connecting hole 37. A penetrating jack 38 is provided on the air intake rod 10, and the inclined hole 41 is connected to the second axial cavity 36. A rotating frame 26 is rotated on the air intake rod 10, and a lifting block 30 that slides through a bar-shaped sliding hole is provided on the rotating frame 26. A rotating gear 9 is coaxially provided on the air intake rod 10, and the rotating gear 9 is connected to the rotating frame 26 through a connecting rod 33. The telescopic rack 8 is engaged with the rotating gear 9. Since the telescopic rack 8 and the rotating gear 9 are engaged with each other, the rotating gear 9 will be driven to rotate forward and reverse.

[0060] The secondary air filter section includes a permeable membrane 11, which is in a rolled-up shape. The rolled-up permeable membrane 11 is coaxially provided with an air intake rod 10, and a plurality of inclined holes 41 are opened on the side wall of the air intake rod 10. The biogas is discharged from the inclined holes 41 on the side wall of the air intake rod 10. The two ends of the rolled-up permeable membrane 11 are respectively tightly attached to the first side wall baffle 24 and the second side wall baffle 34. The other side of the rolled-up permeable membrane 11 is provided with a first side wall baffle 24. The first side wall baffle 24 and the second side wall baffle 34 respectively abut against the two sides of the rolled-up permeable membrane 11, and the air intake rod 10 passes through the first side wall baffle 24 and the second side wall baffle 34. The exhaust pipe 12 is coaxially provided on the second side wall baffle 34. The first side wall baffle 24 and the bracket 25 are respectively provided with a first fixed plate 28 and a second fixed plate 29, and the first fixed plate 28 and the second fixed plate 29 are connected by a connecting plate passing through the strip sliding hole.

[0061] Since the two ends of the rolled-up permeable membrane 11 are counterbalanced by the first side wall baffle 24 and the second side wall baffle 34, the gas will be discharged from the permeable membrane 11, and the gas entering from the first axial cavity 27 will pass through the connecting hole 37 to reach the second axial cavity 36, and then be discharged from the inclined hole 41. The permeation rate of carbon dioxide is fast, and it is discharged as fast gas through the permeable membrane 11; the permeation rate of methane is slow, and it passes through the pressure valve in the outlet hole 35 as slow gas, and then is discharged from the exhaust pipe 12.

[0062] A toggle rod 32 passes through one end of the rolled-up permeable membrane 11, and the toggle rod 32 is inserted into the lifting block 30. The lifting block 30 slides in the strip-shaped sliding hole through the first return spring 31. An insertion rod 39 is inserted into the insertion hole 38, and the insertion rod 39 is fixed to the other end of the permeable membrane 11, and a second return spring 40 is sleeved on the outer wall of the insertion rod 39. The first return spring 31 and the second return spring 40 are both in a compressed state, so they will drive the rotating frame 26 to rotate on the air intake rod 10, and finally drive the toggle rod 32 on the lifting block 30 to rotate forward and reverse around the air intake rod 10.

[0063] A plurality of air outlet holes 35 are provided on the second side wall baffle 34, and a pressure valve is provided in the air outlet hole 35. The swing of the toggle rod 32 and the squeezing action of the first return spring 31 and the second return spring 40 on both sides will change the number of winding turns of the rolled-up permeable membrane 11, thereby changing the number of layers for carbon dioxide filtration and improving the purity of methane in biogas. At the same time, by winding up the permeable membrane 11, the inner diameter of the rolled-up permeable membrane 11 can also be reduced, and the pressure can also be increased, thereby providing a high-pressure environment for removing carbon dioxide.

[0064] The working principle of the present invention is as follows, and the specific steps are as follows:

[0065] S1: First, turn on the drive motor, and let the drive motor drive the drive rod 6 to rotate, and let the primary air filter part and the secondary air filter part at both ends of the drive rod 6 be driven to operate, wherein one end of the drive rod 6 drives the telescopic piston 4 to move through the swinging first swing rod 13 and the second swing rod 14, that is, the telescopic piston 4 is continuously raised and lowered in the air intake cylinder 2, wherein a one-way valve is provided in the air intake hole 5, which can only allow biogas to flow from the outside into the air intake cylinder 2. In the process of the telescopic piston 4 being lifted upward, the telescopic piston 4 is lifted and squeezed to squeeze the gas, and the interconnected internal hole 16 and the side wall hole 17 are blocked by the blocking hole ring 3, so that the gas at this time cannot be discharged, and can only be compressed as the telescopic piston 4 is lifted;

[0066] S2: When the telescopic piston 4 is lifted, the half-ring magnet 22 in the mounting ring groove 21 is lifted together. The side of the half-ring magnet 22 facing the lifting magnet 23 is S-level. The bottom of the lifting magnet 23 is S-level and the top is N-level. When the telescopic piston 4 is lifted, it will attract the half-ring magnet 22 to lift together.

[0067] When the biogas is pressurized, the carbon dioxide therein is adsorbed in the adsorbent 18 on the top of the telescopic piston 4. When the telescopic piston 4 continues to rise, it will also lift the lifting magnet 23. Since the side wall hole 17 is located below the mounting ring groove 21, when the exhaust hole 19 is opened, the side wall hole 17 is connected to the exhaust hole 19. Therefore, methane, a weakly adsorbed gas, will be discharged from the exhaust hole 19 as purified gas.

[0068] S3: As the telescopic piston 4 continues to rise, it reaches the top of the air intake cylinder 2. At this time, the half-ring magnet 22 in the mounting ring groove 21 just passes over the top of the lifting magnet 23 and is located above the lifting magnet 23. Therefore, a repulsion phenomenon will occur. At this time, the lifting magnet 23 will fall under the action of the repulsive force and block the exhaust hole 19 again, while also blocking the side wall hole 17. Then, when the telescopic piston 4 descends, a negative pressure will be formed above the telescopic piston 4. At this time, the gas originally adsorbed in the adsorbent 18 will be released under the negative pressure environment, thereby achieving the regeneration of the adsorbent. In order to ensure the continuous treatment of the gas, the preliminary separation of methane and carbon dioxide in the biogas is also completed. At the same time, after a period of use, it is necessary to open the electric exhaust valve through the external control device to discharge the carbon dioxide in the air intake cylinder 2, so as to facilitate the subsequent continuous separation of the gas.

[0069] S4: The gas exhausted from the exhaust hole 19 will enter the first shaft cavity 27 in the air intake rod 10 through the rubber hose. By adjusting the speed of the driving motor, the speed of the rotating disk 7 will be adjusted. Therefore, the telescopic block 45 on the rotating disk 7 will slide on the radial sliding hole 44. The faster the speed, the more the telescopic block 45 will push the telescopic rack 8 to the left. When the speed decreases, the telescopic rack 8 moves to the right under the action of the third return spring 42, thereby achieving the effect of driving the telescopic rack 8 to move left and right by adjusting the speed;

[0070] S5: Since the telescopic rack 8 and the rotating gear 9 are meshed with each other, the rotating gear 9 will be driven to rotate forward and reverse, thereby driving the rotating frame 26 to rotate on the air inlet rod 10, and finally driving the toggle rod 32 on the lifting block 30 to rotate forward and reverse around the air inlet rod 10. Since the two ends of the rolled-up permeable membrane 11 are resisted by the first side wall baffle 24 and the second side wall baffle 34, the gas will be discharged from the permeable membrane 11, and the gas entering from the first shaft cavity 27 will pass through the connecting hole 37 to the second shaft cavity 36, and then be discharged from the inclined hole 41. The permeation speed of carbon dioxide is fast, and it can penetrate through the air as a fast gas. The methane is discharged through the permeable membrane 11; the permeation speed of methane is slow, and it passes through the pressure valve in the air outlet 35 as slow gas, and then is discharged from the exhaust pipe 12; the swing of the toggle rod 32, plus the squeezing action of the first return spring 31 and the second return spring 40 on both sides, will change the number of winding turns of the rolled-up permeable membrane 11, thereby changing the number of layers for carbon dioxide filtration, thereby improving the purity of methane in biogas, and at the same time, by winding up the permeable membrane 11, the inner diameter of the rolled-up permeable membrane 11 can also be reduced, and the pressure can also be increased, providing a high-pressure environment for removing carbon dioxide.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A biogas treatment device for biogas purification, comprising a biogas treatment device body (1), wherein a driving motor is provided in the biogas treatment device body (1), characterized in that: A driving rod (6) driven by a driving motor is provided in the biogas treatment device body (1), and a primary air filter and a secondary air filter for purifying biogas are provided at both ends of the driving rod (6), and the primary air filter is connected to the secondary air filter via a rubber hose. The primary air filter section comprises a telescopic piston (4), the telescopic piston (4) penetrates and slides telescopically on the side wall of the biogas treatment device body (1), the biogas treatment device body (1) is provided with an air intake cylinder (2) and a baffle ring (3) coaxially arranged with the telescopic piston (4), the air intake cylinder (2) is provided with an air intake hole (5), a one-way valve is provided in the air intake hole (5), and an electric exhaust valve is also provided on the air intake cylinder (2), the telescopic piston (4) is also provided with an adsorbent (18) for adsorbing carbon dioxide in biogas, and the telescopic piston (4) is provided with an internal hole (16) and a side wall hole (17) for discharging biogas to the secondary air filter section; The secondary air filter section comprises a permeable membrane (11), the permeable membrane (11) is in a rolled-up shape, an air intake rod (10) is coaxially arranged on the permeable membrane (11), and a plurality of inclined holes (41) are provided on the side wall of the air intake rod (10), and biogas is discharged from the inclined holes (41) on the side wall of the air intake rod (10), and a first side wall baffle (24) and a second side wall baffle (34) are respectively closely attached to the two ends of the permeable membrane (11) in a rolled-up shape, a plurality of air outlet holes (35) are provided on the second side wall baffle (34), and a pressure valve is provided in the air outlet hole (35).

2. A biogas processing device for biogas purification according to claim 1, characterized in that: The first-level air filter unit also includes: A mounting ring groove (21), wherein the mounting ring groove (21) is provided on the outer side wall of the telescopic piston (4), and a half-ring magnet (22) is fixedly provided in the mounting ring groove (21); A side wall cavity (20) is provided on the side wall of the air inlet cylinder (2); an exhaust hole (19) is provided on the blocking hole ring (3); a lifting magnet (23) is slidably provided in the side wall cavity (20) to block the exhaust hole (19); and a sealing strip is provided on the outer side wall of the lifting magnet (23).

3. A biogas processing device for biogas purification according to claim 2, characterized in that: The internal hole (16) and the side wall hole (17) are arranged perpendicular to each other. The side wall holes (17) are arranged in a plurality and are arranged linearly along the radial direction. The side wall holes (17) are located below the mounting ring groove (21). A mounting cavity is opened on the top of the telescopic piston (4), and the adsorbent (18) is installed in the mounting cavity.

4. A biogas processing device for biogas purification according to claim 3, characterized in that: A first swing rod (13) is fixed to one end of the driving rod (6), a bottom pillow block (15) is fixed to the bottom of the telescopic piston (4), and the bottom pillow block (15) is connected to the other end of the first swing rod (13) via a second swing rod (14).

5. A biogas processing device for biogas purification according to claim 4, characterized in that: A rotating disk (7) is coaxially fixed to the other end of the driving rod (6), and a plurality of radial sliding holes (44) are circumferentially opened on the rotating disk (7), and a telescopic block (45) slides on the radial sliding hole (44), and the telescopic block (45) is connected to the outer wall of the driving rod (6) by a fourth reset spring. A telescopic rack (8) slides in the body (1) of the biogas treatment device, and one end of the telescopic rack (8) is reset and retracted by a third reset spring (42), and the other end is fixed to an end plate (43).

6. A biogas processing device for biogas purification according to claim 5, characterized in that: A bracket (25) is fixed in the biogas treatment device body (1), and an air intake rod (10) is fixed on the bracket (25). A rotating frame (26) is rotatable on the air intake rod (10), and a lifting block (30) is provided on the rotating frame (26) that slides through a strip-shaped sliding hole. A rotating gear (9) is coaxially provided on the air intake rod (10), and the rotating gear (9) is connected to the rotating frame (26) through a connecting rod (33). The telescopic rack (8) and the rotating gear (9) are meshed with each other.

7. A biogas processing device for biogas purification according to claim 6, characterized in that: The air intake rod (10) is coaxially provided with a first axial cavity (27) and a second axial cavity (36), the first axial cavity (27) is connected to the second axial cavity (36) through a connecting hole (37), the air intake rod (10) is provided with a through-hole (38), and the inclined hole (41) is connected to the second axial cavity (36).

8. A biogas processing device for biogas purification according to claim 7, characterized in that: A first side wall baffle (24) is provided on the other side of the rolled-up permeable membrane (11), the first side wall baffle (24) and the second side wall baffle (34) respectively abut against both sides of the rolled-up permeable membrane (11), and an air intake rod (10) passes through the first side wall baffle (24) and the second side wall baffle (34), an exhaust pipe (12) is coaxially arranged on the second side wall baffle (34), a first fixed disk (28) and a second fixed disk (29) are respectively provided on the first side wall baffle (24) and the bracket (25), and the first fixed disk (28) and the second fixed disk (29) are connected by a connecting plate passing through a strip-shaped sliding hole.

9. A biogas processing device for biogas purification according to claim 8, characterized in that: One end of the rolled-up permeable membrane (11) is penetrated by a toggle rod (32), and the toggle rod (32) is inserted into the lifting block (30). The lifting block (30) slides in the strip-shaped sliding hole through a first return spring (31). An insertion rod (39) is inserted into the insertion hole (38), and the insertion rod (39) is fixed to the other end of the permeable membrane (11). A second return spring (40) is sleeved on the outer wall of the insertion rod (39). Both the first return spring (31) and the second return spring (40) are in a compressed state.

10. A method for a biogas treatment device for biogas purification, applied to a biogas treatment device for biogas purification according to claim 9, characterized in that: The specific steps are as follows: S1: First, the driving motor is turned on, and the driving motor drives the driving rod (6) to rotate, and the primary air filter part and the secondary air filter part at both ends of the driving rod (6) are driven to operate, wherein one end of the driving rod (6) drives the telescopic piston (4) to move through the swinging first swing rod (13) and the second swing rod (14), and the lifting of the telescopic piston (4) compresses the gas; S2: When the telescopic piston (4) is lifted, it will lift the half-ring magnet (22) in the mounting ring groove (21) together with it, and will attract the half-ring magnet (22) to lift together; When the biogas is pressurized, the carbon dioxide therein is adsorbed in the adsorbent (18) on the top of the telescopic piston (4). When the telescopic piston (4) continues to rise, it will lift the lifting magnet (23) together. Since the side wall hole (17) is located below the mounting ring groove (21), when the exhaust hole (19) is opened, the side wall hole (17) is connected to the exhaust hole (19), so that methane, a weakly adsorbed gas, will be discharged from the exhaust hole (19) as purified gas. S3: As the telescopic piston (4) continues to rise, the half-ring magnet (22) also just passes over the top of the lifting magnet (23) and is located above the lifting magnet (23), so a repulsion phenomenon occurs. At this time, the lifting magnet (23) will fall under the action of the repulsive force and block the exhaust hole (19) again, and also block the side wall hole (17). Then, when the telescopic piston (4) descends, a negative pressure will be formed above the telescopic piston (4). At this time, the gas originally adsorbed in the adsorbent (18) will be released under the negative pressure environment; S4: The gas discharged from the exhaust hole (19) enters the first shaft cavity (27) in the air inlet rod (10) through the rubber hose, wherein the speed of the driving motor is regulated to adjust the speed of the rotating disk (7), and the speed is regulated to drive the telescopic rack (8) to move left and right; S5: As the telescopic rack (8) and the rotating gear (9) are meshed with each other, the rotating gear (9) is driven to rotate forward and reverse, and at the same time, the gas is discharged from the permeable membrane (11). The gas entering from the first shaft cavity (27) passes through the connecting hole (37) to reach the second shaft cavity (36), and then is discharged from the inclined hole (41). The permeation speed of carbon dioxide is fast, and it is discharged as fast gas by passing through the permeable membrane (11); the permeation speed of methane is slow, and it passes through the pressure valve in the outlet hole (35) as slow gas, and then is discharged from the exhaust pipe (12).

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