Biogas filtering device

Abstract

The utility model belongs to the technical field of biomass biogas treatment, and discloses a biogas filtering device which comprises a tank body, a wire mesh demister and a cleaner, and the tank body is provided with a gas inlet, a gas outlet and a water outlet; the interior of the tank body is divided into an upper cavity and a lower cavity by the wire mesh demister, the upper cavity is communicated with the air outlet, and the lower cavity is respectively communicated with the air inlet and the water outlet; the cleaners are connected with the tank body through flanges, each cleaner comprises a water inlet end and a water outlet end, the number of the cleaners is two, and the two water outlet ends extend into the upper cavity and the lower cavity respectively and face the wire mesh demister. Through the arrangement of the cleaner, the wire mesh demister can be quickly cleaned, the time cost and the labor cost required for disassembling the tank body and the wire mesh demister are saved, and the biogas treatment efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass biogas treatment, in particular to a biogas filtering device. Background Art

[0002] During the biogas treatment process, the biogas just produced by the anaerobic tank usually carries a large amount of lighter impurities and moisture. If these impurities and moisture are transported into the backend system along with the biogas, it will greatly affect the normal operation of the backend system, and even affect the accuracy and service life of the instruments in the backend system.

[0003] At present, the main filtering device used in the market for dehydrating and removing impurities from biogas is a coarse filtering device with a wire mesh demister installed inside. However, if the wire mesh demister in such a filtering device is blocked due to impurity accumulation or other reasons, the user needs to disassemble the filtering device, take out and clean the wire mesh demister or replace it with a new one before it can be used again. However, biogas is a flammable and explosive gas, and direct opening of the filtering device for maintenance has certain safety risks. After nitrogen replacement, the wire mesh demister can be disassembled and maintained. The whole cleaning process has many steps and takes a long time, which will greatly affect the normal operation of the project. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a biogas filtering device, which can directly clean the wire mesh demister in the tank body without disassembling and replacing the wire mesh demister, and effectively improve the biogas treatment efficiency.

[0005] To achieve this purpose, the utility model adopts the following technical solutions: A biogas filtering device includes a tank body, a wire mesh demister and a cleaner. The tank body is provided with an air inlet, an air outlet and a drain outlet. The drain outlet is located below the air inlet, and a first switch valve is installed at the drain outlet. The wire mesh demister is installed inside the tank body and divides the interior of the tank body into an upper chamber and a lower chamber located below the upper chamber. The upper chamber is communicated with the air outlet, and the lower chamber is respectively communicated with the air inlet and the drain outlet. The cleaner is connected to the tank body. There are two cleaners in total, and the water outlet ends of the two cleaners respectively extend into the upper chamber and the lower chamber and face the wire mesh demister, and the water inlet ends can be connected to an external water source or a steam source.

[0006] Preferably, the cleaner includes a pipe body, the pipe body is connected to the tank body, and the water inlet end and the water outlet end are respectively arranged at both ends of the pipe body.

[0007] Preferably, the cleaner further includes a spray head, and the spray head is connected to the water outlet end.

[0008] Preferably, the two cleaners are symmetrically arranged on both sides of the wire mesh demister in the vertical direction.

[0009] Preferably, the pipe body extends along the radial direction of the tank body, and the spray head and the tank body are coaxially arranged.

[0010] Preferably, the spray head is configured as a spiral nozzle, and the spiral nozzle is threadedly connected to the water outlet end.

[0011] Preferably, the biogas filtration device further includes a differential pressure gauge. The tank body is provided with two gas extraction ports, the two gas extraction ports are respectively communicated with the upper cavity and the lower cavity, and the two gas extraction ports are respectively connected to the two detection ends of the differential pressure gauge through pipelines.

[0012] Preferably, the tank body is provided with a manhole, the manhole is communicated with the inside of the tank body, and a detachable blind plate is installed at the manhole.

[0013] Preferably, the tank body is further provided with an exhaust port and a reserved port. The exhaust port is communicated with the upper cavity, the reserved port is communicated with the lower cavity, a second switch valve is installed at the exhaust port, and the reserved port is used for installing a detachable liquid level gauge.

[0014] Preferably, the drain port is connected with a water seal structure. The water seal structure is provided with a bypass pipeline communicated with the drain port, and the first switch valve is arranged on the bypass pipeline.

[0015] The beneficial effects of the present utility model: By providing two cleaners, the user can directly open an external water source or steam source without disassembling the tank body, so that the water outlet ends facing the wire mesh demister directly spray water or steam towards the wire mesh demister, thereby flushing the impurities blocking both sides of the wire mesh demister, realizing the rapid cleaning of the wire mesh demister and ensuring the cleaning effect, saving the time cost and labor cost required for disassembling the tank body and the wire mesh demister and waiting for nitrogen replacement, and effectively improving the processing efficiency of biogas. Description of the Drawings

[0016] Figure 1 is the front view of the biogas filtration device of the present utility model;

[0017] Figure 2 is Figure 1 the cross-sectional view at A-A in

[0018] Figure 3 is the top view of the biogas filtration device of the present utility model;

[0019] Figure 4 is Figure 2 the enlarged view at B in

[0020] In the figure: 100, tank body; 110, air inlet; 111, upper cavity; 112, lower cavity; 120, air outlet; 130, drain outlet; 140, installation part; 141, ring plate; 142, through hole; 150, manhole; 151, blind plate; 160, reserved port; 170, installation port; 180, lifting lug; 200, wire mesh demister; 300, cleaner; 310, pipe body; 311, water inlet end; 312, water outlet end; 320, spray head; 330, flange; 340, mounting plate. Detailed implementation manners

[0021] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0022] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0024] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0025] Refer to Figures 1 to 3, A biogas filtration device provided by an embodiment of the present utility model includes a tank body 100, a wire mesh demister 200, and a cleaner 300. The tank body 100 is provided with an air inlet 110, an air outlet 120, and a drain outlet 130. The air inlet 110 is provided in the middle and lower part of the tank body 100 and is connected to the front-end system. The air outlet 120 is provided at the center of the top end of the tank body 100 and is connected to the rear-end system. The drain outlet 130 is provided below the air inlet 110, and a first switch valve is installed at the drain outlet 130. The wire mesh demister 200 is installed inside the tank body 100 and divides the interior of the tank body 100 into an upper chamber 111 and a lower chamber 112 which are distributed up and down. The upper chamber 111 is communicated with the air outlet 120, and the lower chamber 112 is respectively communicated with the air inlet 110 and the drain outlet 130.

[0026] The cleaner 300 is connected to the tank body 100. The cleaner 300 includes a water inlet end 311 and a water outlet end 312. The water inlet end 311 can be connected to an external water source or steam source, and the water outlet end 312 extends into the tank body 100 and faces the wire mesh demister 200.

[0027] Specifically, referring to Figure 2 As shown, it can be understood that there are two cleaners 300. The water outlet end 312 (or the spray head 320) of one cleaner 300 extends into the upper chamber 111 inside the tank body 100, and the water outlet end 312 (or the spray head 320) of the other cleaner 300 extends into the lower chamber 112 inside the tank body 100. The spray heads 320 of the two cleaners 300 are arranged oppositely and both face the wire mesh demister 200.

[0028] It can be understood that by setting two cleaners 300, the user can directly open the external water source or steam source without disassembling the tank body 100, so that the water outlet end 312 facing the wire mesh demister 200 directly sprays water on the wire mesh demister 200. The water outlet ends 312 on the two cleaners 300 can spray and wash the upper and lower sides of the wire mesh demister 200, thereby washing away the impurities blocking the wire mesh demister 200 and preventing the impurities from accumulating on the unwashed side of the wire mesh demister 200, effectively cleaning the wire mesh demister 200, realizing the rapid cleaning of the wire mesh demister 200, saving the time cost and labor cost required for disassembling the tank body 100 and the wire mesh demister 200 and waiting for nitrogen replacement, and effectively improving the biogas treatment efficiency.

[0029] In some embodiments, the tank body 100 is a flat-bottomed or vertical cylindrical tank supported by legs. The inner diameter size and height size of the tank body 100 can be determined according to the biogas flow rate. The inner diameter size of the air inlet 110 is determined according to the biogas volume, and the height of the air inlet 110 from the bottom surface of the tank body 100 is determined according to the biogas design pressure. The inner diameters of the air outlet 120 and the air inlet 110 are the same to ensure the ventilation efficiency, and the installation positions of the air outlet 120 and the drain outlet 130 can be set according to the size and shape of the tank body 100.

[0030] Specifically, when the tank body 100 is a flat-bottom vertical tank, the drain port 130 is located about 150 mm above the bottom panel of the tank body 100. When the tank body 100 is a vertical tank supported by legs, the drain port 130 can be arranged at the center of the bottom end of the tank body 100.

[0031] In some embodiments, lifting lugs 180 for equipment hoisting are symmetrically arranged on both sides of the air outlet 120.

[0032] The wire mesh demister 200 is a split-type wire mesh demister installed from above. Such a wire mesh demister 200 is mainly composed of a wire mesh and upper and lower support grid bars, which is a mature product in the field. Different shapes, sizes, filtration precisions, and materials can be selected according to actual needs, and will not be elaborated here.

[0033] Refer to Figure 2 and Figure 4 As shown, it can be understood that the wire mesh demister 200 can be directly installed on the inner wall of the tank body 100, or can be installed on the installation part 140 arranged inside the tank body 100.

[0034] Among them, the installation part 140 can be an annular plate 141 welded and fixed to the inner wall of the tank body 100. The center of the annular plate 141 is a through hole 142 for biogas to pass through. The diameter of the through hole 142 needs to be determined according to the biogas flow rate to ensure the biogas flow rate. The wire mesh demister 200 matches and overlaps with the annular plate 141.

[0035] By setting the annular plate 141, on the one hand, the annular plate 141 has a simple structure and is convenient for processing, which can effectively reduce the material cost of the filtering device; on the other hand, setting the annular plate 141 can greatly reduce the height of the installation part 140, avoiding subsequent interference between the annular plate 141 and the pipe body 310 and affecting the installation of the pipe body 310.

[0036] It should be added that reinforcing ribs can also be arranged below the annular plate 141. A plurality of reinforcing ribs are arranged at intervals along the circumferential direction of the annular plate 141, so as to increase the supporting force of the annular plate and improve the installation stability of the wire mesh demister 200.

[0037] In addition, the installation part 140 can also be set as an annular block extending downward from the inner top surface of the tank body 100 and surrounding the wire mesh demister 200. At this time, a hollow structure for the pipe body 310 and the spray head 320 to pass through is arranged on the side wall of the annular block.

[0038] The cleaner 300 includes a pipe body 310. The water inlet end 311 and the water outlet end 312 are respectively arranged at both ends of the pipe body 310. The pipe body 310 is connected to the tank body 100. Specifically, an installation plate 340 is connected to the outer peripheral wall of the pipe body 310, that is, the installation plate 340 is provided with an installation hole, and the pipe body 310 is in interference fit with the installation hole or the pipe body 310 and the installation plate 340 are integrally formed. The tank body 100 is provided with an installation port 170, and the installation port 170 is hermetically connected to the installation plate 340 through a flange structure. The pipe body 310 passes through the installation port 170 so that the water outlet end 312 of the pipe body 310 extends into the tank body 100. A flange member 330 is provided at the water inlet end 311 of the pipe body 310, and the water inlet end 311 is hermetically connected to the pipeline of an external water source or steam source through the flange member 330. When the external water source or steam source is opened, the water outlet end 312 can spray washing water or steam towards the wire mesh demister 200 to realize the backwashing function.

[0039] The pipe body 310 is connected to the tank body 100 through the installation plate 340. While ensuring the stable installation of the pipe body 310, the flange structure between the installation plate 340 and the installation port 170 can improve the sealing performance of the tank body 100, prevent the leakage of pressure, biogas or water vapor sprayed from the water outlet end 312 in the tank body 100, and improve the use safety of the filtering device.

[0040] Preferably, two cleaners 300 are symmetrically arranged on both sides of the wire mesh demister 200 along the vertical direction, which is convenient for designing and processing the installation port 170 and ensures the consistency of the cleaning effect of the cleaners 300 on both sides of the wire mesh demister 200.

[0041] It should be noted that when the pipe body 310 extends into the tank body 100 along the vertical direction, the water outlet end 312 faces the wire mesh demister 200. When the pipe body 310 does not extend into the tank body 100 vertically, an elbow can be provided at the end of the pipe body 310 so that the end of the elbow not connected to the pipe body 310 forms a water outlet end 312 facing the wire mesh demister 200. This is specifically stated here to avoid misunderstanding.

[0042] Refer to Figure 2 and Figure 3 As shown, it can be understood that the cleaner 300 further includes a spray head 320, and the spray head 320 is connected to the water outlet end 312. Specifically, the pipe body 310 extends along the radial direction of the tank body 100, that is, the pipe body 310 is located on the side wall of the tank body 100 and is horizontally arranged (at this time, the elbow is a 90° right-angle elbow), and the position of the connecting plate on the pipe body 310 is accurately calculated so that when the connecting plate is connected to the installation port 170, the spray head 320 and the tank body 100 (or the ring plate 141) are coaxial.

[0043] The pipe body 310 is set horizontally, which can facilitate the installation or disassembly of the pipe body 310. At the same time, it is convenient to preset the position of the connecting plate, improving the assembly efficiency of the biogas filtration device. The spray head 320 and the tank body 100 are coaxially arranged, so that the water vapor sprayed by the spray head 320 can evenly wash the wire mesh demister 200 covering the through hole 142 of the ring plate 141, improving the cleaning efficiency of the biogas filtration device.

[0044] In addition, when the spray head 320 and the tank body 100 are not coaxially arranged, a plurality of pipe bodies 310 and the spray head 320 can be arranged at intervals along the circumferential direction of the wire mesh demister 200, and the same effect of evenly washing the wire mesh demister 200 can be achieved, which will not be elaborated here.

[0045] Preferably, the spray head 320 is configured as a spiral nozzle. The spiral nozzle is a corrosion-resistant stainless steel part, and the spiral nozzle is threadedly connected to the elbow.

[0046] The spray head 320 is configured as a stainless steel spiral nozzle. On the one hand, the hollow conical spiral design of the spiral nozzle can make the water vapor spray out of the spray head 320 at a high speed, improving the spraying efficiency and spraying distance and ensuring the stability and reliability of the spraying process. On the other hand, the high-pressure and corrosion-resistant characteristics of the spiral nozzle itself can ensure that the spiral nozzle can work in the tank body 100 for a long time, effectively extending the service life of the spray head 320.

[0047] Preferably, the biogas filtration device further includes a differential pressure gauge. The differential pressure gauge is installed on the outer wall of the tank body 100. The tank body 100 is provided with two air intake ports, and the two air intake ports are respectively communicated with the upper cavity 111 and the lower cavity 112. The two air intake ports are respectively connected to the two detection ends of the differential pressure gauge through air pipes.

[0048] By setting the differential pressure gauge, the differential pressure gauge detects the pressures in the upper cavity 111 and the lower cavity 112 respectively through the two air intake ports, and then the differential pressure on the upper and lower sides of the wire mesh demister 200 can be measured. Users can judge the working condition of the wire mesh demister 200 by regularly inspecting the differential pressure gauge value. When the differential pressure gauge reading is large, for example, greater than or equal to 200 Pa, it indicates that the wire mesh demister 200 is blocked. Users need to clean the wire mesh demister 200 in time with an external water source or steam source to avoid affecting the biogas treatment efficiency.

[0049] In addition, if it is found that the differential pressure between the upper and lower sides of the wire mesh demister 200 does not decrease significantly after flushing the wire mesh demister 200 many times, it indicates that the wire mesh demister 200 is severely blocked, and the wire mesh demister 200 inside the tank body 100 needs to be taken out for repair or replacement.

[0050] Preferably, one end of the drain port 130 located outside the tank body 100 is connected with a water seal structure. The water seal structure is provided with a bypass pipeline connected to the drain port 130, and the first on-off valve is arranged on the bypass pipeline.

[0051] Specifically, the water seal structure includes a U-shaped pipe with a downward opening, which is sequentially connected by three pipelines. A vertical water replenishment port is provided on one side of the U-shaped pipe. The bypass pipeline is a pipe extending radially along the tank body 100 and connecting the two ends of the U-shaped pipe. One end of the bypass pipeline is connected to the drain port 130, and the other end is connected to the external space. The first on-off valve is arranged on the bypass pipeline and is located at the opening of the U-shaped pipe. Opening the first on-off valve can discharge sewage.

[0052] It should be noted that the first on-off valve can be a ball valve, butterfly valve, globe valve, etc. with a simple structure and convenient use, or an electromagnetic valve with high intelligence and good control accuracy. The type of the first on-off valve is not specifically limited here, and users can select a suitable valve body according to actual needs, which will not be elaborated here.

[0053] The depth of the water seal structure (i.e., the height of the U-shaped pipe) is determined according to the design pressure of biogas, and it is ensured that the water seal depth meets the biogas pressure requirements.

[0054] In the initial state, that is, when the air inlet 110 is connected to the front-end system, the air outlet 120 is connected to the rear-end system, and the tank body 100 is not connected to biogas, the user can close the first on-off valve, open the external water source or steam source, and observe the end of the bypass pipeline in the water seal structure that is not connected to the drain port 130 until water flows out of the water seal structure, completing the initial water replenishment of the water seal inside the biogas rough filtration device.

[0055] By setting the water seal structure, on the one hand, the drain port 130 can be sealed in the form of a water seal to further improve the sealing performance of the biogas filtration device; on the other hand, when the external water source or steam source is opened to spray and heavily wash the wire mesh demister 200, the liquid in the tank body 100 that exceeds the water seal depth will automatically drain out of the tank body 100 through the water seal structure, realizing the automatic drainage function, saving the time cost required for the user to manually drain water, and improving the use convenience of the biogas filtration device.

[0056] In addition, the wire mesh demister 200, the pipe body 310, the nozzle 320 and the water seal structure cooperate with each other to form a "filtration + backwashing + automatic drainage" cyclic cleaning system, effectively improving the working efficiency of the biogas filtration device.

[0057] Refer to Figure 1 and Figure 2 As shown, it can be understood that the tank body 100 is provided with a manhole 150, the manhole 150 is internally connected to the tank body 100, the manhole 150 and the pipe body 310 are arranged at intervals along the circumferential direction of the tank body 100, a detachable blind plate 151 is installed at the manhole 150, and the manhole 150 and the blind plate 151 are also sealed and connected through a flange structure. The maximum outer diameter of each block of the split wire mesh demister 200 is smaller than the aperture of the manhole 150.

[0058] By providing a manhole 150, when the biogas filtration device is operating normally, the blind plate 151 blocks the manhole 150 to ensure the sealing of the tank body 100. When the biogas filtration device is shut down, the user can remove the blind plate 151 to inspect, maintain, or load and unload the wire mesh demister 200 through the manhole 150. In addition, since the manhole 150 and the pipe body 310 are arranged at intervals along the circumferential direction of the tank body 100, it is also convenient for the user to inspect, maintain, or load and unload the spray head 320 through the manhole 150, improving the user experience.

[0059] Preferably, the tank body 100 is further provided with an exhaust port and a reserved port 160. The exhaust port communicates with the upper cavity 111, and the reserved port 160 communicates with the lower cavity 112.

[0060] Specifically, the exhaust port can be arranged on the tank body 100 or on the side wall of the air outlet 120, thereby simplifying the structure of the tank body 100. A second switching valve is installed at the exhaust port, and the structure of the second switching valve can refer to the description of the first switching valve above and will not be elaborated here. The reserved port 160 is suitable for installing a detachable hydrostatic level gauge.

[0061] Before the user removes the blind plate 151 to repair components such as the wire mesh demister 200 and the spray head 320 inside the tank body 100, the biogas filtration device can be disconnected from the front-end system and the back-end system first, and the air inlet and the air outlet 120 can be isolated and blocked. Subsequently, the first switching valve is opened to drain the accumulated water inside, the second switching valve is opened and the level gauge is removed, and nitrogen is introduced at the reserved port 160 to displace the biogas inside the tank body 100 until the internal gas is qualified. Then, keep introducing nitrogen and take relevant protective measures for the repair operation.

[0062] By providing the exhaust port and the reserved port 160, on the one hand, the reserved port 160 can install a hydrostatic level gauge, so as to detect the liquid level height in the lower cavity 112 in real time when the biogas filtration device is operating or backwashing, helping the user quickly decide whether to replenish or drain water; on the other hand, the exhaust port and the reserved port 160 cooperate to achieve rapid air exchange inside the tank body 100, avoiding damage to the human body caused by residual biogas and further improving the use safety of the biogas filtration device.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A biogas filtering device, characterized in that: include: The tank body (100) is provided with an air inlet (110), an air outlet (120) and a water outlet (130), wherein the water outlet (130) is located below the air inlet (110), and a first switch valve is installed at the water outlet (130); a wire mesh demister (200) installed inside the tank body (100) and dividing the inside of the tank body (100) into an upper chamber (111) and a lower chamber (112), wherein the upper chamber (111) is in communication with the air outlet (120), and the lower chamber (112) is in communication with the air inlet (110) and the water outlet (130), respectively; A cleaner (300) is connected to the tank body (100), and the cleaner (300) comprises a water inlet end (311) and a water outlet end (312). The cleaner (300) is provided with two upper and lower ends. The water outlet ends (312) of the two cleaners (300) extend into the upper chamber (111) and the lower chamber (112) respectively and face the wire mesh demister (200) respectively. The water inlet end (311) can be connected to an external water source or a steam source.

2. A biogas filtering device according to claim 1, characterized in that: The cleaner (300) comprises a tube body (310), the tube body (310) is connected to the tank body (100), and the water inlet end (311) and the water outlet end (312) are respectively arranged at two ends of the tube body (310).

3. A biogas filtering device according to claim 2, characterized in that: The cleaner (300) further comprises a spray head (320), and the spray head (320) is connected to the water outlet (312).

4. A biogas filtering device according to claim 3, characterized in that: The two cleaners (300) are symmetrically arranged on both sides of the wire mesh demister (200) in the vertical direction.

5. A biogas filtering device according to claim 3, characterized in that: The tube body (310) is arranged to extend radially along the tank body (100), and the spray head (320) and the tank body (100) are arranged coaxially.

6. A biogas filtering device according to claim 3, characterized in that: The spray head (320) is configured as a spiral nozzle, and the spiral nozzle is threadedly connected to the water outlet end (312).

7. A biogas filtering device according to claim 1, characterized in that: The biogas filtering device also includes a differential pressure gauge. The tank body (100) is provided with two air intake ports, the two air intake ports are respectively connected to the upper chamber (111) and the lower chamber (112), and the two air intake ports are respectively connected to the detection end of the differential pressure gauge.

8. A biogas filtering device according to claim 1, characterized in that: The tank body (100) is provided with a manhole (150), the manhole (150) is communicated with the interior of the tank body (100), and a detachable blind plate (151) is installed at the manhole (150).

9. A biogas filtering device according to claim 8, characterized in that: The tank body (100) is further provided with an exhaust port and a reserved port (160); the exhaust port is in communication with the upper chamber (111); the reserved port (160) is in communication with the lower chamber (112); a second switch valve is installed at the exhaust port; and the reserved port (160) is used for installing a detachable liquid level meter.

10. The biogas filtering device according to claim 1, characterized in that: The drain port (130) is connected to a water seal structure, the water seal structure is provided with a bypass pipeline communicating with the drain port (130), and the first switch valve is arranged on the bypass pipeline.

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