A biogas power generation tail gas recycling device

Abstract

This application discloses a biogas power generation tail gas reuse device, relating to the field of biogas power generation technology. It includes a housing, a first side plate, a second side plate, a main gas pipe, branch gas pipes, and a drive component. The first and second side plates are symmetrically arranged on the inner walls of both sides of the housing. An inlet pipe and an outlet pipe are respectively provided on both sides of the housing, and cavities are provided inside both the first and second side plates. A main gas pipe is installed inside the housing, with one end rotatably connected to the first side plate and the other end rotatably connected to the second side plate. The main gas pipe passes through the second side plate and the housing and connects to the drive component. One end of the main gas pipe extends into the inner cavity of the first side plate, and the main gas pipe communicates with the inner cavity of the first side plate. Multiple gas ports are opened in the portion of the main gas pipe located in the inner cavity of the second side plate. Multiple branch gas pipes are distributed circumferentially on the main gas pipe. This device can utilize the heat from the biogas power generation tail gas while simultaneously achieving uniform drying of the biogas residue, realizing resource and energy utilization within the industrial chain.

Description

Technical Field

[0001] This utility model relates to the field of biogas power generation technology, and in particular to a biogas power generation tail gas recycling device. Background Technology

[0002] Against the backdrop of energy utilization and environmental protection, biogas power generation, with its clean and renewable characteristics, has become a prominent energy utilization method and is widely used in numerous scenarios. During the operation of biogas power generation, a large amount of high-temperature exhaust gas is generated, which contains abundant thermal energy. If this thermal energy can be rationally and efficiently recovered and reused, it can significantly improve the overall energy utilization efficiency, allowing energy to be fully utilized; on the other hand, it can effectively reduce the negative environmental impact of thermal pollution, which is of vital importance for promoting sustainable energy development and environmental protection.

[0003] Meanwhile, a certain amount of biogas residue is generated in the complete biogas production industrial chain. Biogas residue itself has certain utilization value. In order to realize its recycling and create greater economic benefits, it usually needs to be dried first. After drying, the physical and chemical properties of the biogas residue are more suitable for recycling as a by-product such as cattle bedding. This not only provides high-quality bedding resources for the livestock industry but also further expands the added value of the biogas industry, forming a complete industrial closed loop.

[0004] In the crucial stage of drying biogas residue, the limitations of traditional drying equipment are becoming increasingly apparent. Traditional drying equipment mostly relies on a fixed heat source, which leads to uneven heating of the material during the drying process. During drying, some materials may experience localized overheating due to proximity to the heat source or concentrated heat. Excessive temperatures can damage the internal molecular structure of the material, leading to a decline in quality and affecting its subsequent use as a byproduct and its market value. Conversely, other materials may experience insufficient drying due to distance from the heat source or poor heat transfer. This not only prolongs drying time, reduces drying efficiency, and increases production costs, but may also cause the material to easily mold and deteriorate during storage, further affecting its quality and utilization value. Therefore, developing a device and technology that can fully and efficiently utilize the heat from biogas power generation tail gas while achieving uniform drying of biogas residue has become a critical issue urgently needing to be addressed in the fields of energy utilization and biogas residue recycling. Utility Model Content

[0005] To solve the above problems, the purpose of the present utility model is to provide a device for recycling the tail gas of biogas power generation. This device for recycling the tail gas of biogas power generation fully utilizes the heat in the tail gas generated after biogas power generation, reduces the energy waste of biogas, and this part of the heat is used to dry the biogas residue, achieving the resource utilization of the biogas residue.

[0006] This application provides a device for recycling the tail gas of biogas power generation, including a box body, a first side plate, a second side plate, a main air pipe, a bronchus, and a driving component; a feeding end is arranged at the top of the box body, and a discharge door is opened at the bottom of the box body; the first side plate and the second side plate are symmetrically arranged on the inner walls of both sides of the box body; an air inlet pipe and an air outlet pipe are respectively arranged on both sides of the box body, and cavities are arranged inside both the first side plate and the second side plate; a main air pipe is arranged inside the box body, one end of the main air pipe is rotatably connected to the first side plate, and the other end of the main air pipe is rotatably connected to the second side plate; the main air pipe passes through the second side plate and the box body and is connected to the driving component, and the driving component is used to drive the main air pipe to rotate self; one end of the main air pipe extends into the cavity inside the first side plate, and the inside of the main air pipe is hollow and is communicated with the cavity inside the first side plate; multiple air ports are arranged on the part of the main air pipe located in the cavity inside the second side plate, so that the main air pipe is communicated with the cavity inside the second side plate through the air ports; the driving component is installed on the outer side wall of the box body; multiple bronchi are circumferentially distributed on the main air pipe, and both ends of the bronchus are fixed and communicated with the main air pipe.

[0007] Optionally, the air inlet pipe passes through the box body and the first side plate and extends into the cavity inside the first side plate; the air outlet pipe passes through the box body and the second side plate and extends into the cavity inside the second side plate.

[0008] Optionally, one end of the main air pipe is connected to the first side plate by means of dynamic sealing connection, and the other end of the main air pipe is connected to the second side plate by means of dynamic sealing connection.

[0009] Optionally, the bronchus is of a "C" - shaped structure, an arc - shaped structure or an "M" - shaped structure.

[0010] Optionally, the sizes of the multiple bronchi are different; the structural sizes of the multiple bronchi are set to be scaled according to a preset proportional relationship; the distances between the two sides of the bronchus along the axial direction of the main air pipe from the first side plate and the second side plate are equal.

[0011] Optionally, multiple heat dissipation fins can be arranged on the bronchus.

[0012] One or more technical solutions provided in this application have at least the following technical effects or advantages: The material is dried using high-temperature exhaust gas from biogas power generation. The unit has inlet and outlet pipes on both sides. Side plates one and two are symmetrically located on the inner walls of both sides of the unit and have internal cavities. The inlet and outlet pipes extend into these cavities and are sealed together. The main gas pipe is rotatably connected to the side plates at both ends with dynamic seals. One end is connected to the drive unit, the other end is open and communicates with the cavity of side plate one, and the other end has an outlet communicating with the cavity of side plate two. Multiple branch pipes are distributed circumferentially around the main gas pipe. The biogas exhaust gas enters through the inlet pipe and forms a heat source through the main and branch pipes. The drive unit drives the main gas pipe to rotate, which in turn drives the branch pipes to stir the material, improving the drying effect. This system utilizes the heat from the biogas exhaust gas to achieve uniform drying of the biogas residue, realizing resource and energy utilization within the industrial chain. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the biogas power generation tail gas recycling device of this utility model; Figure 2 This is a schematic diagram showing the location of the gas inlet of the biogas power generation tail gas recycling device of this utility model; Figure 3 This is a schematic diagram of the branch pipe distribution of the biogas power generation tail gas recycling device of this utility model. Figure 4 This is a schematic diagram showing the location of the heat sink in the biogas power generation tail gas recycling device of this utility model.

[0014] In the diagram: 10. Housing; 11. Supporting component; 12. Feeding end; 13. Discharge door; 14. Dehumidifier; 15. Air inlet pipe; 16. Air outlet pipe; 20. Side plate one; 30. Side plate two; 40. Main air pipe; 41. Air inlet; 50. Branch air pipe; 51. Heat sink; 60. Drive component. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more comprehensive description of this application will be given below with reference to the accompanying drawings, which show preferred embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this utility model.

[0016] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] Example: Figures 1 to 4 As shown, the biogas power generation tail gas reuse device of this application includes a housing 10, a first side plate 20, a second side plate 30, a main gas pipe 40, a branch gas pipe 50, a drive component 60, a power component, and a control unit.

[0019] The bottom of the housing 10 is provided with a support component 11.

[0020] It should be noted that the support component 11 can be a support leg or a support frame, which is existing technology and will not be described in detail here.

[0021] The top of the box 10 is provided with a feeding end 12, and the bottom of the box 10 is provided with a discharge door 13.

[0022] It should be noted that the feed end 12 of the box 10 can be a feed hopper, and the feed hopper can be equipped with an opening and closing door; the discharge door 13 is equipped with a sealing gasket (not shown in the figure) or a sealing ring (not shown in the figure), so that the discharge door 13 can be sealed on the box 10; the feed end 12 and the discharge door 13 are common structures in the prior art, and will not be described in detail here.

[0023] Optionally, the space inside the housing 10 in this embodiment can be a cylindrical space with the central axis set horizontally.

[0024] Side panel 1 20 and side panel 2 30 are symmetrically arranged on the inner walls of both sides of the box 10.

[0025] It should be noted that side panel 20 and side panel 30 can be installed inside the housing 10 by bolt connection or snap-fit ​​connection, respectively. The specific installation method is existing technology and will not be described in detail here.

[0026] An air inlet pipe 15 and an air outlet pipe 16 are respectively provided on both sides of the housing 10.

[0027] Both side plate 1 (20) and side plate 2 (30) have cavities inside.

[0028] Specifically, the air intake pipe 15 passes through the housing 10 and the side panel 20 and extends into the internal cavity of the side panel 20; the air outlet pipe 16 passes through the housing 10 and the side panel 30 and extends into the internal cavity of the side panel 30.

[0029] It should be noted that both the air inlet pipe 15 and the air outlet pipe 16 are equipped with sealing gaskets (not shown in the figure) or sealing rings (not shown in the figure), so that the air inlet pipe 15 is sealed to the side plate 20, the air inlet pipe 15 is sealed to the housing 10, the air outlet pipe 16 is sealed to the side plate 30, and the air outlet pipe 16 is sealed to the housing 10. This sealing method is a common structure in the prior art and will not be described in detail here.

[0030] The housing 10 is equipped with a main air pipe 40. One end of the main air pipe 40 is rotatably connected to the side plate 20, and the other end of the main air pipe 40 is rotatably connected to the side plate 30.

[0031] In this embodiment, the main air pipe 40 passes through the side plate 30 and the housing 10 and is connected to the drive component 60. The drive component 60 is used to drive the main air pipe 40 to rotate.

[0032] One end of the main air tube 40 extends into the internal cavity of the side plate 20, and the main air tube 40 is hollow inside, and the main air tube 40 is connected to the internal cavity of the side plate 20.

[0033] The main air pipe 40 is provided with multiple air ports 41 in the part of the internal cavity of the side plate 2 30, so that the main air pipe 40 is connected to the internal cavity of the side plate 2 30 through the air ports 41.

[0034] The drive unit 60 is mounted on the outer side wall of the housing 10.

[0035] It should be noted that there can be 3, 4, 5, 6, or 7 air ports 41, etc. The specific number and size of the air ports 41 are selected according to actual needs, and will not be elaborated here.

[0036] In addition, one end of the main air pipe 40 is connected to the side plate 20 by a dynamic sealing connection, and the other end of the main air pipe 40 is connected to the side plate 30 by a dynamic sealing connection.

[0037] It should be noted that in this embodiment, the end of the main air pipe 40 away from the driving component 60 is open, and the end of the main air pipe 40 near the driving component 60 is closed, so that gas enters from the opening at the end of the main air pipe 40 away from the driving component 60 and exits from the air port 41.

[0038] The drive component 60 may be a drive motor.

[0039] Among them, the dynamic sealing connection can be a mechanical seal, such as the Burgmann MG1 mechanical seal, which has been widely used in existing technology and will not be described in detail here.

[0040] It is important to note that, such as Figure 1 and Figure 2As shown, one end of the main air pipe 40 close to the driving component 60 penetrates through the second side plate 30. Therefore, two dynamic seal connection components can be selected to be arranged at this end of the main air pipe 40 to achieve a better sealing effect; one end of the main air pipe 40 far from the driving component 60 extends into the first side plate 20. Therefore, one dynamic seal connection component can be selected to be arranged at this end of the main air pipe 40 to achieve a better sealing effect; this sealing method is a conventional choice for those skilled in the art and will not be elaborated here.

[0041] Among them, the main air pipe 40 in this embodiment can be horizontally arranged.

[0042] The power component is used to supply energy for the operation of the device, preferably an AC power supply or a battery; the control unit is used to control the coordinated operation of each component of the device, preferably a programmable logic controller; both are prior arts and will not be elaborated here.

[0043] Furthermore, as Figure 1 and Figure 3 shown, in another embodiment of the present application, a plurality of bronchial tubes 50 are circumferentially distributed on the main air pipe 40.

[0044] The bronchial tubes 50 are connected to the main air pipe 40.

[0045] It should be noted that the bronchial tubes 50 can be installed on the main air pipe 40 by welding or bolt connection, and a sealing mechanism (not shown in the figure), such as a gasket or a sealing ring, can be arranged at the position where the bronchial tubes 50 are connected to the main air pipe 40. This sealing method is a common structure in the prior art and will not be elaborated in detail here.

[0046] It should be noted that the plurality of bronchial tubes 50 can be 3, 4, 5, 6, 7 bronchial tubes 50, etc. The specific number and inner diameter size of the bronchial tubes 50 are selected according to actual needs and will not be elaborated here.

[0047] Among them, both ends of the bronchial tubes 50 are fixed and connected to the main air pipe 40.

[0048] The bronchial tubes 50 are of a "C" - shaped structure, or can be an arc - shaped structure or an "M" - shaped structure. The specific shape is selected according to actual needs and is not specifically limited in this embodiment.

[0049] Optionally, the plurality of bronchial tubes 50 are evenly distributed on the main air pipe 40.

[0050] In addition, regulating valves are arranged on both the intake pipe 15 and the outlet pipe 16. The regulating valves are a conventional choice for those skilled in the art and will not be elaborated here.

[0051] Specifically, in actual operation, the staff opens the opening and closing door (if any) of the feeding end 12 and puts the material to be dried (such as biogas residue) into the box 10 through the feeding end 12. After feeding is completed, the opening and closing door (if any) of the feeding end 12 is closed. High-temperature biogas power generation exhaust gas is introduced into the internal cavity of the side plate 20 through the air inlet pipe 15. The biogas power generation exhaust gas enters the main gas pipe 40 from the end away from the drive component 60, and then enters the internal cavity of the side plate 30 through the air outlet 41, and then is discharged through the air outlet pipe 16 to enter the next process (such as the gas purification process). During the flow of high-temperature gas, the drive component 60 is started. The drive component 60 drives the main gas pipe 40 to rotate. During the rotation of the main gas pipe 40, it drives the main gas pipe 40 to rotate. The multiple branch pipes 50 distributed in the upper direction rotate together. The branch pipes 50 are through-pipe structures, through which the high-temperature exhaust gas from biogas power generation flows. During this process, the main gas pipe 40 and the branch pipes 50 heat up to form a heat source to dry the material (such as biogas residue). Simultaneously, the side plates 20 and 30 also form heat sources to dry the material (such as biogas residue). At the same time, the branch pipes 50 rotate with the main gas pipe 40, stirring the material (such as biogas residue) inside the chamber 10, ensuring full contact between the material and the heat source, improving the drying effect, and promoting better release of water vapor from the material (such as biogas residue). This water vapor can be discharged through the feed end 12, improving the uniformity of drying. After the material is dried, the discharge door 13 is opened to discharge the processed material. After discharge, the discharge door 13 is closed.

[0052] Understandably, by introducing the high-temperature exhaust gas released by the biogas generator into the main gas pipe 40 and branch gas pipe 50, a heat source is formed to dry the material inside the housing 10. The main gas pipe 40 drives the branch gas pipe 50 to rotate, thereby stirring the material and improving the uniformity of heating. At the same time, the water vapor generated by the material during the turning process is released. High-temperature exhaust gas is introduced into the side plates 20 and 30, making them fixed heat sources. Combined with the moving heat sources of the main gas pipe 40 and branch gas pipe 50, the drying effect can be better achieved. The continuous stirring and turning of the material during the drying process can prevent some materials from being overheated and becoming excessively hardened on the surface.

[0053] Optionally, a maintenance door (not shown in the figure) may be provided on the side wall of the enclosure 10, and the maintenance door is offset from the side plate 20 and the side plate 30. The maintenance door is provided with a sealing gasket (not shown in the figure) or a sealing ring (not shown in the figure), so that the maintenance door can be sealed on the enclosure 10. The maintenance door is a conventional choice for those skilled in the art, and will not be described in detail here.

[0054] Optionally, such as Figure 1As shown, a dehumidifier 14 can be installed on the top of the box 10. The dehumidifier 14 is used to draw water vapor from inside the box 10 to the outside of the box 10.

[0055] It should be noted that the dehumidifier 14 may be a fan with an anti-corrosion coating, which is existing technology and will not be described in detail here.

[0056] like Figure 3 As shown, in another embodiment of this application, the multiple bronchi 50 have different sizes.

[0057] The structural dimensions of multiple bronchi 50 can be scaled according to a preset proportional relationship.

[0058] It should be noted that a temperature sensor (not shown in the figure) and a humidity sensor (not shown in the figure) can be installed inside the enclosure 10. The temperature sensor and humidity sensor have the characteristics of high temperature resistance and corrosion resistance. For example, the temperature sensor can be a K-type armored thermocouple from Rolls-Royce in the United States, and the monitoring end can be directly inserted near the heat source or the material layer; it can also be a SHT85 digital temperature and humidity sensor from Sensirion in Switzerland, which can detect both temperature and humidity and can be installed on the top inner wall of the enclosure 10. The temperature sensor and humidity sensor in this application are all mature products in the prior art, and their usage methods and internal structural principles will not be described in detail here.

[0059] For example, if the length values ​​of multiple bronchi 50 are increased by increments of one-tenth of the minimum length value from smallest to largest, then the distance values ​​between the multiple bronchi 50 and the main trachea 40 are also increased by increments of one-tenth of the minimum distance value from smallest to largest. Assuming there are six bronchi 50, the minimum length of each bronchi 50 is 50 cm, and the minimum distance to the main trachea 40 is 20 cm, the dimensional parameters of the multiple bronchi 50 can be found in the table below:

[0060] It should be noted that the above content is only a hypothetical scenario. The specific preset proportions and size ranges should be selected according to actual needs, and the distribution of multiple bronchi 50 on the main trachea 40 does not have to follow an increasing or decreasing size distribution. Figure 3 Only one method is given in the text.

[0061] Optionally, such as Figure 1 As shown, the distances from the bronchus 50 to the side plates 20 and 30 on both sides along the axial direction of the main trachea 40 are equal.

[0062] The length direction of the bronchus 50 is the same as the axial direction of the bronchus 50 along the main trachea 40. The distance between the bronchus 50 and the main trachea 40 is the perpendicular distance between the farthest radial portion of the bronchus 50 along the main trachea 40 and the main trachea 40. For details, please refer to [reference needed]. Figure 1 .

[0063] It should be added that the main air pipe 40 drives the branch air pipe 50 to rotate, and the branch air pipe 50 will not collide with the inner wall of the box 10. The distance between the main air pipe 40 and the bottom of the box 10, and the distance between the main air pipe 40 and the two side walls of the box 10 (the side walls without side plates 20 and 30) can be equal, and this distance can be less than the distance between the main air pipe 40 and the top of the box 10. In this case, the maximum stirring range of the branch air pipe 50 can be slightly smaller than the distance between the main air pipe 40 and the bottom of the box 10 (for example, the difference is 3 cm to 10 cm) to achieve a more thorough stirring and drying effect. The distance between the main air pipe 40 and the top of the box 10 is relatively large because the biogas residue placed inside the box 10 will not be completely filled. If the biogas residue occupies one-half to two-thirds of the internal space of the box 10, a better stirring and drying effect can be ensured by reasonably setting the position of the main air pipe 40. This setting method is a conventional choice for those skilled in the art and will not be elaborated here.

[0064] It should be noted that the main air pipe 40 and branch air pipe 50 in this application can be made of stainless steel, which has a certain hardness and can achieve a stable stirring and drying effect; and the wall thickness of the main air pipe 40 can be set according to actual needs, such as 5 cm to 8 cm; the side plate 20 and side plate 30 can both be made of aluminum alloy, and the internal cavity of the side plate 20 and side plate 30 can both be equipped with support members (not shown in the figure), which can be made of stainless steel, ensuring a certain limit of strength while ensuring the thermal conductivity of the side plate 20 and side plate 30.

[0065] Similarly, the inner surfaces of side plate 1 20, side plate 2 30, main air pipe 40, and branch air pipe 50, as well as the inner surface of the box body 10, can all be provided with anti-corrosion coatings. This method is a conventional choice for those skilled in the art and will not be described in detail here.

[0066] Temperature compensation components (not shown in the figure), such as heating layers or embedded electric heating wires, may be provided on the housing 10 to compensate for temperature. This is a common choice for those skilled in the art and will not be described in detail here.

[0067] It is understandable that by setting up branch pipes 50 of different sizes, during the rotation of the main air pipe 40, multiple branch pipes 50 can dry and stir the materials at different positions inside the box 10. The stirring and drying ranges of multiple branch pipes 50 complement each other, improving the drying efficiency and uniformity, and better promoting the release of moisture inside the materials.

[0068] Furthermore, such as Figure 4 As shown, in another embodiment of this application, a plurality of heat sinks 51 may be provided on the bronchus 50.

[0069] The heat sink 51 can be made of stainless steel, aluminum alloy or copper alloy.

[0070] It should be noted that the number of heat sinks 51 on each bronchus 50 can be 6, 7, 8, 9, or 10, etc. The specific number can be selected according to actual needs, which will not be elaborated here.

[0071] It is understandable that by setting up the heat sink 51, the heat on the branch pipe 50 can be better transferred to the material through the heat sink 51, and the heat sink 51 can better promote the turning of the material. The heat sink 51 drives the material to move better during the movement.

[0072] It should be noted that the heat sink 51 in this embodiment can be set perpendicularly to the bronchus 50 or at an angle; the shape of the heat sink 51 can be circular, square or triangular; the specific shape of the heat sink 51 and the angular relationship between the heat sink 51 and the main bronchus 40 can be selected according to actual needs, and are not specifically limited here.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, various modifications and variations are possible with this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A biogas power generation tail gas recycling device, characterized in that, It includes a box body (10), a first side plate (20), a second side plate (30), a main air pipe (40), a bronchial tube (50) and a driving component (60); A feed end (12) is provided at the top of the box body (10), and a discharge door (13) is opened at the bottom of the box body (10); The first side plate (20) and the second side plate (30) are symmetrically arranged on the inner walls on both sides of the box body (10); An air inlet pipe (15) and an air outlet pipe (16) are respectively arranged on both sides of the box body (10), and cavities are arranged inside both the first side plate (20) and the second side plate (30); A main air pipe (40) is arranged inside the box body (10), one end of the main air pipe (40) is rotatably connected to the first side plate (20), and the other end of the main air pipe (40) is rotatably connected to the second side plate (30); The main air pipe (40) passes through the second side plate (30) and the box body (10) and is connected to the driving component (60), and the driving component (60) is used to drive the main air pipe (40) to rotate self; One end of the main air pipe (40) extends into the cavity inside the first side plate (20), and the main air pipe (40) is communicated with the cavity inside the first side plate (20); Multiple air ports (41) are arranged on the part of the main air pipe (40) located in the cavity inside the second side plate (30), so that the main air pipe (40) is communicated with the cavity inside the second side plate (30) through the air ports (41); The driving component (60) is installed on the outer side wall of the box body (10); Multiple bronchial tubes (50) are circumferentially distributed on the main air pipe (40), and both ends of the bronchial tube (50) are fixed and communicated with the main air pipe (40).

2. The biogas power generation tail gas recycling device according to claim 1, characterized in that, The air inlet pipe (15) passes through the box body (10) and the first side plate (20) and extends into the cavity inside the first side plate (20); the air outlet pipe (16) passes through the box body (10) and the second side plate (30) and extends into the cavity inside the second side plate (30).

3. The biogas power generation tail gas recycling device according to claim 1, characterized in that, One end of the main air pipe (40) is connected to the first side plate (20) by means of dynamic sealing connection, and the other end of the main air pipe (40) is connected to the second side plate (30) by means of dynamic sealing connection.

4. The biogas power generation tail gas recycling device according to claim 1, characterized in that, The bronchial tube (50) is of a "C" - shaped structure, an arc - shaped structure or an "M" - shaped structure; 5. The biogas power generation tail gas recycling device as described in claim 1, characterized in that, The sizes of multiple said bronchial tubes (50) are different; The structural sizes of the multiple bronchial tubes (50) are set to be scaled according to a preset proportional relationship; The distances between the two sides of the bronchial tube (50) along the axial direction of the main air pipe (40) from the first side plate (20) and the second side plate (30) are equal; 6. The biogas power generation tail gas recycling device according to claim 1, characterized in that, Multiple heat dissipation fins (51) can be arranged on the bronchial tube (50).

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