An apparatus for separating and purifying biogas

Abstract

This utility model discloses a device for separating and purifying biogas, relating to the field of biogas purification. It comprises a first housing and a second housing, both being basin-shaped structures open at one end, with flanges at their open ends, and the flanges being fixedly connected by bolts. An air inlet is provided on the side of the first housing. This utility model incorporates a first purification component and a second purification component within the assembly of the first and second housings. These components divide the interior of the assembly into three spatial regions. Biogas enters through the air inlet, is filtered by the first and second purification components, and finally flows out through the exhaust port, thus achieving layer-by-layer filtration and purification of the biogas. This purification device is simple to install, facilitates subsequent disassembly, cleaning, or replacement of the filter elements, and ensures continuous purification efficiency.

Description

Technical Field

[0001] This utility model relates to the field of biogas purification, specifically a device for separating and purifying biogas. Background Technology

[0002] Biogas purification is a crucial step in improving biogas utilization efficiency, ensuring safe equipment operation, and reducing environmental pollution. Biogas, a mixed gas, is primarily composed of methane (CH4), but also contains carbon dioxide (CO2), hydrogen sulfide (H2S), water vapor (H2O), and other trace impurities. These impurities can affect the calorific value of biogas, corrode equipment, and even pollute the environment; therefore, purification treatment is necessary to remove them.

[0003] Membrane separation utilizes polymer membrane materials to selectively allow CO2 to pass through, thereby achieving decarbonization. However, polymer membranes require regular cleaning or replacement during biogas purification. The installation and disassembly of existing polymer membranes are quite complicated, which is not conducive to subsequent maintenance operations. Utility Model Content

[0004] The purpose of this invention is to provide a device for separating and purifying biogas in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for separating and purifying biogas, comprising a first cover and a second cover, wherein both the first cover and the second cover are basin-shaped structures with one end open, and both the opening ends of the first cover and the second cover are provided with flanges, and the two flanges are fixedly connected by bolts.

[0006] An air inlet is provided on the side of the first cover, and an exhaust outlet is provided at the center of the top of the first cover. A first purification component and a second purification component are installed inside between the first cover and the second cover. The first purification component surrounds the second purification component in the circumferential direction, and is used to divide the internal space of the first cover and the second cover assembly into three areas.

[0007] The first region is the area between the first and second housing assembly and the first purification component. The first region is connected to the air inlet. The second region is the area between the first purification component and the second purification component. The second purification component has a cylindrical structure, and the hollow chamber of the second purification component is a third region, which is connected to the exhaust port.

[0008] As a further improvement of this utility model, the dimensions and heights of the first purification component and the second purification component are adapted to the height of the inner cavity of the first cover and the second cover assembly.

[0009] As a further embodiment of this utility model: one end of the first purification component is sealed and fixedly connected to the top of the inner cavity of the first cover, and the other end of the first purification component abuts against the rubber pad on the bottom surface of the inner cavity of the second cover.

[0010] As a further embodiment of this utility model: the first purification component includes two fixing rings, and a plurality of connecting strips are connected between the two fixing rings. The plurality of connecting strips are distributed in a ring at equal intervals. A pressing strip is provided on the outer side of the connecting strip. The pressing strip has the same structure as the connecting strip and the connecting strip is connected to the pressing strip by screws. A polymer filter membrane is sandwiched on the mating surface of the connecting strip and the pressing strip.

[0011] As a further embodiment of this utility model: the second purification component includes a first mesh cylinder and a second mesh cylinder, the second mesh cylinder is located inside the first mesh cylinder and is coaxially arranged with the first mesh cylinder, a base is connected to one side of the first mesh cylinder and the second mesh cylinder, the base is fixedly connected to the bottom of the inner cavity of the second cover by screws, and the base is fixedly connected to the first mesh cylinder and the second mesh cylinder by welding.

[0012] The other end of the first mesh cylinder is integrally formed with a first connecting ring, and an annular groove is formed on the inner side of the first connecting ring. The other end of the second mesh cylinder is integrally formed with a second connecting ring. The outer end face of the second connecting ring is at the same height as the bottom end face of the annular groove on the first connecting ring. A sealing gasket and a pressure ring are placed in the annular groove. The sealing gasket is located between the pressure ring and the bottom end face of the annular groove. The thickness of the sealing gasket and the pressure ring is greater than the depth of the annular groove.

[0013] As a further improvement of this utility model, activated carbon is filled between the first mesh cylinder and the second mesh cylinder.

[0014] As a further embodiment of this utility model: the inner wall of the first cover is integrally formed with a bracket at both sides corresponding to the air inlet, and a baffle is provided between the two brackets. The baffle is located on one side of the air inlet, and the baffle has a disc-shaped structure, and the outer diameter of the baffle is larger than the inner diameter of the air inlet.

[0015] As a further improvement of this utility model, a sealing ring is provided between the flange of the first cover and the flange of the second cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention incorporates a first purification component and a second purification component within a combination of a first and a second housing. These components divide the interior of the combined housing into three spatial regions. Biogas enters through the inlet, is filtered by the first and second purification components, and finally flows out through the outlet, thus achieving layer-by-layer filtration and purification of the biogas. This purification device is simple to install and facilitates subsequent disassembly, cleaning, or replacement of the filter components, ensuring continuous purification efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the first purification component and the first housing of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the second purification component and the second housing of this utility model.

[0022] In the diagram: 1. First housing; 11. Air inlet; 12. Exhaust outlet; 2. Second housing; 3. First purification component; 301. Fixing ring; 302. Connecting strip; 303. Pressing strip; 304. Polymer filter membrane; 4. Second purification component; 401. First mesh cylinder; 402. Second mesh cylinder; 403. Base; 404. First connecting ring; 405. Second connecting ring; 406. Sealing gasket; 407. Pressure ring; 5. Sealing ring; 6. Rubber pad; 7. Bracket; 8. Baffle. Detailed Implementation

[0023] 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, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 In this embodiment of the utility model, a device for separating and purifying biogas includes a first cover 1 and a second cover 2. Both the first cover 1 and the second cover 2 are basin-shaped structures with one open end, and both the open ends of the first cover 1 and the second cover 2 are provided with flanges, which are fixedly connected by bolts.

[0025] An air inlet 11 is provided on the side of the first cover 1, and an exhaust port 12 is provided at the top center of the first cover 1. A first purification component 3 and a second purification component 4 are installed inside between the first cover 1 and the second cover 2. The first purification component 3 surrounds the second purification component 4 in the circumferential direction, and is used to divide the internal space of the assembly of the first cover 1 and the second cover 2 into three areas.

[0026] The first region is the area between the first housing 1 and the second housing 2 assembly and the first purification component 3. The first region is connected to the air inlet 11. The second region is the area between the first purification component 3 and the second purification component 4. The second purification component 4 has a cylindrical structure, and the hollow chamber of the second purification component 4 is the third region. The third region is connected to the exhaust port 12.

[0027] The dimensions and heights of the first purification component 3 and the second purification component 4 are matched with the height of the inner cavity of the first housing 1 and the second housing 2 assembly; one end of the first purification component 3 is sealed and fixedly connected to the top of the inner cavity of the first housing 1, and the other end of the first purification component 3 abuts against the rubber pad 6 on the bottom end face of the inner cavity of the second housing 2; a sealing ring 5 is provided between the flange of the first housing 1 and the flange of the second housing 2.

[0028] In this embodiment: by setting a first purification component 3 and a second purification component 4 in the combination of the first housing 1 and the second housing 2, the inner cavity of the combination of the first housing 1 and the second housing 2 is divided into three spatial areas by the first purification component 3 and the second purification component 4. Biogas enters through the air inlet 11, is filtered by the first purification component 3 and the second purification component 4, and finally flows out from the exhaust port 12, so that the biogas is filtered and purified layer by layer. The purification device is simple to install and easy to disassemble, clean or replace the filter elements, ensuring continuous purification efficiency.

[0029] Specifically, the device for separating and purifying biogas mainly includes a first housing 1, a second housing 2, a first purification component 3, and a second purification component 4. The first purification component 3 is fixedly installed at the top of its inner cavity, and the second purification component 4 is fixedly installed at the bottom of its inner cavity. The first housing 1 and the second housing 2 are then connected and fixed together to form a device for purifying biogas. The inner cavity of this device is divided into three areas by the first purification component 3 and the second purification component 4. This allows for layer-by-layer filtration and purification to remove hydrogen sulfide, volatile organic compounds, water vapor, carbon dioxide, and particulate impurities from the biogas.

[0030] First, the unpurified biogas is introduced into the first area of ​​the purification device through the air inlet 11. The first area is an annular space. The biogas is filtered and purified for the first time by the first purification component 3. The biogas filtered for the first time enters the second area, which is also an annular space. At this time, the biogas filtered for the first time is filtered and purified again by the second purification component 4. The biogas purified by the second filtration will be collected in the inner cavity of the second purification component 4, which is the third area, and finally discharged and collected through the exhaust port 12.

[0031] Please refer to this carefully. Figures 1-4 The first purification component 3 includes two fixing rings 301, and multiple connecting strips 302 are connected between the two fixing rings 301. The multiple connecting strips 302 are distributed in a ring at equal intervals. A pressing strip 303 is provided on the outer side of the connecting strips 302. The pressing strip 303 has the same structure as the connecting strips 302, and the connecting strips 302 and the pressing strip 303 are connected by screws. A polymer filter membrane 304 is clamped on the mating surface of the connecting strips 302 and the pressing strip 303.

[0032] In this embodiment, the first purification component 3 mainly utilizes a polymer filter membrane 304 to filter and purify biogas. The polymer filter membrane achieves gas separation through selective permeation, and its core principle is based on the differences in solubility and diffusion rate of different gases in the membrane material. The main components of biogas, methane (CH4) and carbon dioxide (CO2), have significantly different permeation rates in the membrane due to their different molecular sizes and chemical properties. For example, CO2 molecules are smaller and more polar, making them easier to dissolve and diffuse through the membrane material, while CH4 molecules are larger and non-polar, resulting in a slower permeation rate. By controlling the operating pressure and temperature, impurities such as CO2 can preferentially permeate through the membrane, while CH4 is enriched on the permeate side, thereby achieving biogas purification.

[0033] The fixing ring 301, connecting strip 302, and pressing strip 303 in the first purification component 3 are all support and installation structures for the polymer filter membrane 304, facilitating quick replacement of the polymer filter membrane 304 in the future.

[0034] Please refer to this carefully. Figures 1-4 The second purification component 4 includes a first mesh cylinder 401 and a second mesh cylinder 402. The second mesh cylinder 402 is located inside the first mesh cylinder 401 and is coaxially arranged with the first mesh cylinder 401. A base 403 is connected to one side of the first mesh cylinder 401 and the second mesh cylinder 402. The base 403 is fixedly connected to the bottom of the inner cavity of the second cover 2 by screws, and the base 403 is fixedly connected to the first mesh cylinder 401 and the second mesh cylinder 402 by welding.

[0035] The other end of the first mesh cylinder 401 is integrally connected to a first connecting ring 404. An annular groove is formed on the inner side of the first connecting ring 404. The other end of the second mesh cylinder 402 is integrally connected to a second connecting ring 405. The outer end face of the second connecting ring 405 is at the same height as the bottom end face of the annular groove on the first connecting ring 404. A sealing gasket 406 and a pressure ring 407 are placed in the annular groove. The sealing gasket 406 is located between the pressure ring 407 and the bottom end face of the annular groove. The thickness of the sealing gasket 406 and the pressure ring 407 is greater than the depth of the annular groove. Activated carbon is filled between the first mesh cylinder 401 and the second mesh cylinder 402.

[0036] In this embodiment: Activated carbon is a porous carbon material with a complex internal structure, high porosity, and an extremely large specific surface area, with each gram of activated carbon having a surface area of ​​500-1700 square meters. These characteristics endow activated carbon with excellent adsorption capacity. In biogas filtration, activated carbon can adsorb impurities such as hydrogen sulfide (H2S), water vapor, and siloxanes in biogas, thereby improving the purity of biogas.

[0037] Since the adsorption capacity of activated carbon is limited, it needs to be replaced or regenerated when the adsorption reaches saturation. Therefore, this solution stores the activated carbon filter layer between the first mesh cylinder 401 and the second mesh cylinder 402, and permanently seals one end of it with the base 403. The other end is detachably sealed with the first connecting ring 404, the second connecting ring 405, the sealing gasket 406 and the pressure ring 407, which facilitates the subsequent replacement of the activated carbon filter layer.

[0038] Please refer to this carefully. Figures 1-4 The inner wall of the first cover 1 is integrally formed with a bracket 7 at both sides of the air inlet 11. A baffle 8 is provided between the two brackets 7. The baffle 8 is located on one side of the air inlet 11 and has a disc-shaped structure. The outer diameter of the baffle 8 is larger than the inner diameter of the air inlet 11.

[0039] In this embodiment: It should be noted that the existing biogas purification process requires the use of a flow pump to guide the flow of biogas for purification. When the biogas is introduced into the air inlet 11 of this device, the biogas has a certain flow rate. In order to avoid damage to the polymer filter membrane 304, the flow direction of the biogas entering the first area is changed by the baffle 8 to prevent the biogas from directly impacting the polymer filter membrane 304.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for separating and purifying biogas, characterized in that, It includes a first cover (1) and a second cover (2). Both the first cover (1) and the second cover (2) are basin-shaped structures with one end open. Both the first cover (1) and the second cover (2) have flanges at their open ends, and the two flanges are fixedly connected by bolts. An air inlet (11) is provided on the side of the first cover (1), and an exhaust port (12) is provided at the middle of the top of the first cover (1). A first purification component (3) and a second purification component (4) are installed inside between the first cover (1) and the second cover (2). The first purification component (3) surrounds the second purification component (4) in the circumferential direction, and is used to divide the internal space of the assembly of the first cover (1) and the second cover (2) into three areas. The first region is between the first housing (1) and the second housing (2) assembly and the first purification component (3). The first region is connected to the air inlet (11). The second region is between the first purification component (3) and the second purification component (4). The second purification component (4) is a cylindrical structure. The hollow chamber of the second purification component (4) is a third region. The third region is connected to the exhaust port (12).

2. The apparatus for separating and purifying biogas according to claim 1, characterized in that, The dimensions and heights of the first purification component (3) and the second purification component (4) are matched with the height of the inner cavity of the first housing (1) and the second housing (2) assembly.

3. The apparatus for separating and purifying biogas according to claim 2, characterized in that, One end of the first purification component (3) is sealed and fixedly connected to the top of the inner cavity of the first cover (1), and the other end of the first purification component (3) abuts against the rubber pad (6) on the bottom surface of the inner cavity of the second cover (2).

4. The apparatus for separating and purifying biogas according to claim 3, characterized in that, The first purification component (3) includes two fixing rings (301), and a plurality of connecting strips (302) are connected between the two fixing rings (301). The plurality of connecting strips (302) are distributed in a ring at equal intervals. A pressing strip (303) is provided on the outer side of the connecting strip (302). The pressing strip (303) has the same structure as the connecting strip (302), and the connecting strip (302) and the pressing strip (303) are connected by screws. A polymer filter membrane (304) is held between the mating surfaces of the connecting strip (302) and the pressing strip (303).

5. The apparatus for separating and purifying biogas according to claim 4, characterized in that, The second purification component (4) includes a first mesh cylinder (401) and a second mesh cylinder (402). The second mesh cylinder (402) is located inside the first mesh cylinder (401) and is coaxially arranged with the first mesh cylinder (401). A base (403) is connected to one side of the first mesh cylinder (401) and the second mesh cylinder (402). The base (403) is fixedly connected to the bottom of the inner cavity of the second cover (2) by screws, and the base (403) is fixedly connected to the first mesh cylinder (401) and the second mesh cylinder (402) by welding. The other end of the first mesh cylinder (401) is integrally formed with a first connecting ring (404). An annular groove is formed on the inner side of the first connecting ring (404). The other end of the second mesh cylinder (402) is integrally formed with a second connecting ring (405). The outer end face of the second connecting ring (405) is at the same height as the bottom end face of the annular groove on the first connecting ring (404). A sealing gasket (406) and a pressure ring (407) are placed in the annular groove. The sealing gasket (406) is located between the pressure ring (407) and the bottom end face of the annular groove. The thickness of the sealing gasket (406) and the pressure ring (407) is greater than the depth of the annular groove.

6. The apparatus for separating and purifying biogas according to claim 5, characterized in that, Activated carbon is filled between the first mesh cylinder (401) and the second mesh cylinder (402).

7. The apparatus for separating and purifying biogas according to claim 6, characterized in that, The inner wall of the first cover (1) is integrally formed with a bracket (7) at both sides of the air inlet (11). A baffle (8) is provided between the two brackets (7). The baffle (8) is located on one side of the air inlet (11), and the baffle (8) is a disc-shaped structure. The outer diameter of the baffle (8) is larger than the inner diameter of the air inlet (11).

8. The apparatus for separating and purifying biogas according to claim 7, characterized in that, A sealing ring (5) is provided between the flange of the first cover (1) and the flange of the second cover (2).

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