A biogas purification treatment system

Abstract

The application relates to a biogas purification treatment system, and relates to the field of biogas purification, which comprises a filter, a dehydrator, a desulfurization tower, a fine filter and a gas storage tank. The dehydrator comprises a dehydration body and a detection channel. A water absorption and color change assembly is arranged on the dehydration body, the water absorption and color change assembly is used for detecting the water content in the detection channel, an air inlet is arranged on the dehydration body, an air outlet one and an air outlet two are arranged on the detection channel, a sealing assembly is arranged on the dehydration body, the sealing assembly is used for plugging the air outlet one or the air outlet two, a connecting pipe one is arranged on the dehydration body and is used for connecting the air outlet one and the desulfurization tower, and a connecting pipe two is arranged on the dehydration body and is used for connecting the air outlet two and the air inlet. The water absorption and color change assembly is used for detecting the water in the dehydrated biogas, the water residue in the dehydrated biogas is reduced, and then the water residue in the gas storage tank is reduced, and the situation that the gas storage tank is damaged by the water in the biogas is reduced.

Description

Technical Field

[0001] This application relates to the field of biogas purification, and in particular to a biogas purification system. Background Technology

[0002] Biogas is a mixture of gases, the main component of which is methane, followed by hydrogen sulfide, saturated water vapor, high-carbon hydrocarbons (from ethane C2H6 to heptane C7H16); it may also contain impurities such as nitrogen, helium, hydrogen, siloxanes, halogenated hydrocarbons and solid particulate matter.

[0003] For small-scale biogas projects, biogas can be used to generate electricity for mechanical power, while for large and medium-sized biogas projects, the biogas produced can be used for power generation, boiler operation, food processing, heating, etc.

[0004] Because biogas contains the above-mentioned impurities and its flow rate, pressure, temperature, and concentration are very unstable, direct use in gas-fired power generation will inevitably cause equipment corrosion and abrasion problems, thus severely shortening the lifespan of the gas generator. Therefore, before use, biogas needs to be purified through a biogas purification system to solve the above problems.

[0005] The biogas purification system consists of a filter, a dehydrator, a desulfurization tower, a fine filter, and a storage tank. The filter removes solid impurities from the biogas, the desulfurization tower and dehydrator remove water and sulfur molecules from the biogas respectively, and the fine filter further filters the biogas to meet usage standards before storing it in the storage tank.

[0006] In related technologies, biogas is dehydrated by a dehydrator before entering the pipeline and then the storage tank. Some water molecules remain in the biogas. When the biogas is pressurized and stored in the storage tank, the water in the biogas freezes, which can easily damage the storage tank. This needs to be improved. Summary of the Invention

[0007] In order to prevent the gas storage tank from being damaged by the water in the biogas, this application provides a biogas purification and treatment system.

[0008] The biogas purification system provided in this application adopts the following technical solution:

[0009] A biogas purification system includes a filter, a dehydrator, a desulfurization tower, a fine filter, a gas storage tank, and pipelines. Biogas is purified and stored in the gas storage tank by sequentially passing through the filter, dehydrator, desulfurization tower, and fine filter along the pipeline. The dehydrator includes a dehydration body and a detection channel on the dehydration body. The dehydration body is equipped with a water-absorbing and color-changing component that extends into the detection channel and is used to detect the water content in the detection channel. The dehydration body has an air inlet, and the detection channel has an air outlet and an air outlet. The dehydration body is equipped with a sealing component that is used to seal either the first or the second air outlet. The dehydration body is equipped with a connecting pipe and a connecting pipe. The first connecting pipe is used to connect the first air outlet to the desulfurization tower, and the second connecting pipe is used to connect the second air outlet to the air inlet.

[0010] By adopting the above technical solution, in the actual biogas purification process, the biogas, after being filtered by the filter, enters the dehydration unit through a pipeline for dehydration. The dehydrated biogas then enters the detection channel. While passing through the detection channel, the biogas passes through the water-absorbing color-changing component. Workers observe the water-absorbing expansion component. When the color of the water-absorbing color-changing component changes, the sealing component blocks outlet one, allowing the biogas to flow out from outlet two and into connecting pipe two. It then re-enters the dehydration unit through the inlet along connecting pipe two for further dehydration. After dehydration, the biogas enters the detection channel. If the color of the water-absorbing color-changing component does not change, the sealing component blocks outlet two, allowing the biogas in the detection channel to enter connecting pipe two from outlet one and then into the desulfurization tower for desulfurization. The water-absorbing color-changing component detects the water content in the dehydrated biogas, reducing residual water and thus helping to reduce water residue in the storage tank, minimizing the risk of the storage tank freezing due to water in the biogas.

[0011] Preferably, the sealing assembly includes an adjusting disc rotatably connected to the dehydration body, a first sealing element and a second sealing element disposed on the adjusting disc, an opening on the adjusting disc, and the second air outlet located on the rotation path of the second sealing element and the opening. The opening is used to communicate with the second air outlet, and the first air outlet is located on the rotation path of the first sealing element. When the second sealing element blocks the second air outlet, the first air outlet communicates with the first connecting pipe; when the opening communicates with the second air outlet, the first sealing element blocks the first air outlet.

[0012] By adopting the above technical solution, when the color of the water-absorbing color-changing component changes, rotating the adjusting disc seals the first outlet, connecting the second outlet to the opening. This allows biogas in the detection channel to enter the second connecting pipe through the second outlet and the opening, and then enter the dehydration body through the inlet along the second connecting pipe. When the color of the water-absorbing color-changing component does not change, rotating the adjusting disc in the opposite direction seals the second outlet, connecting the first outlet to the first connecting pipe. This allows biogas in the detection channel to enter the first connecting pipe through the first outlet, and then enter the desulfurization tower along the first connecting pipe. Rotating the adjusting disc controls the opening and closing of the first and second outlets, making it convenient to control the flow direction of biogas in the detection channel.

[0013] Preferably, the water-absorbing and color-changing assembly includes a turntable rotatably connected to the dehydration body and a plurality of water-absorbing and color-changing elements disposed on the turntable, and the detection channel is located on the moving path of the water-absorbing and color-changing elements.

[0014] By adopting the above technical solution, when the biogas passing through the water-absorbing color-changing component contains water during the process of detecting whether dehydration is complete, the water-absorbing color-changing component needs to be replaced after the test. At this time, simply rotate the turntable to cover the detection channel with the new water-absorbing color-changing component, making the replacement of the water-absorbing color-changing component convenient.

[0015] Preferably, a cover plate is rotatably connected to the dehydration body, and the cover plate is used to rotatably cover one end of the detection channel near the dehydration body.

[0016] By adopting the above technical solution, in actual use, after the dehydrated biogas fills the detection channel, the cover plate closes the detection channel, and the dehydrated biogas is tested in batches, which helps to reduce the mixing of qualified dehydrated biogas with unqualified dehydrated biogas.

[0017] Preferably, the rotation axes of the cover plate, the turntable, and the adjusting plate are parallel to each other. The rotation direction of the turntable is the same as the rotation direction of the cover plate when it opens the detection channel. A transmission rod is slidably connected to the adjusting plate, and the sliding direction of the transmission rod is consistent with the radial direction of the adjusting plate. A drive rod one is provided on the cover plate, and a plurality of drive rods two are provided on the turntable. The drive rods two are correspondingly arranged with the water-absorbing color-changing component. The transmission rod is located between adjacent drive rods one and drive rods two. A guide surface one is provided on the drive rod one, and the guide surface one faces away from the rotation axis of the cover plate and away from the transmission rod. The drive rod is inclined, and a guide surface is provided on the second drive rod. The guide surface is inclined away from the direction away from the rotation axis of the cover plate and away from the transmission rod. The guide surface and the guide surface are used to abut against the transmission rod. The sliding friction of the transmission rod is greater than the rotation friction of the adjustment disk. A limiting block is provided on the adjustment disk to limit the rotation angle of the adjustment disk. The distance between the rotation axis of the cover plate and the turntable is greater than the sum of the radii of the cover plate and the turntable, and less than the sum of the maximum distance from the drive rod to the rotation axis of the cover plate and the maximum distance from the drive rod to the axis of the turntable.

[0018] By adopting the above technical solution, in actual use, rotating the cover plate allows biogas to enter the detection channel. At this time, sealing element two blocks gas outlet two, and gas outlet one is connected to connecting pipe one. When biogas passes through the water-absorbing color-changing element, if the color of the water-absorbing color-changing element does not change, the biogas enters the desulfurization tower from gas outlet one through connecting pipe one. When the color of the water-absorbing color-changing element changes, first rotate the cover plate to block the detection channel, reducing the amount of biogas in the dehydration body that continues to enter the detection channel. Rotate the turntable to replace the water-absorbing color-changing element. The turntable abuts against the transmission rod through drive rod two, driving the adjustment plate to rotate. When the adjustment plate rotates to the point where the opening is connected to gas outlet two, sealing element blocks gas outlet one, and gas outlet two is connected to connecting pipe two, allowing biogas to enter the connecting pipe one from gas outlet two and then flow back into the dehydration body for dehydration again. At this time, the adjustment plate rotates to the maximum angle and cannot rotate further. Continue rotating the turntable, causing the transmission rod to move along guide surface two, approach the cover plate, and disengage from drive rod two. At this time, the transmission rod is located on the rotation path of drive rod one. When the gas in the detection channel flows back into the dehydration body from connecting pipe two, the cover rotates to open the detection channel, allowing biogas to enter. During the rotation of the cover, drive rod one abuts against the transmission rod, which in turn drives the adjusting disc to rotate in the opposite direction, causing seal two to re-seal gas outlet two, and gas outlet one to reconnect with connecting pipe one. The cooperation between drive rod one, drive rod two, and transmission rod makes it easy to control the rotation of the adjusting disc, thereby making it easier to control the opening and closing of opening one and opening two.

[0019] Preferably, the included angle between adjacent drive rods is greater than twice the rotation angle of the transmission rod, and the adjusting disc is provided with a plurality of air holes, which are located between adjacent water-absorbing and color-changing components.

[0020] By adopting the above technical solution, when the turntable drives the regulating plate to rotate through the drive rod and transmission rod, when the opening rotates to connect with the second air outlet, the air hole connects the detection channels on both sides of the regulating plate, reducing the contact between the insufficiently dehydrated biogas in the detection channel and the new water-absorbing color-changing component, which is beneficial to improving the detection effect of the water-absorbing color-changing component.

[0021] Preferably, the water-absorbing and color-changing component is a color-changing silicone block, the dehydration body is equipped with a drying box, the adjusting plate is located inside the drying box, and the detection channel passes through the drying box.

[0022] By adopting the above technical solution, when biogas passes through the color-changing silica gel block, the silica gel block changes color. After the silica gel block changes color, the turntable is rotated so that the color-changing silica gel block enters the drying chamber, and another color-changing silica gel block covers the detection channel. The color-changing silica gel block that enters the drying chamber is heated and restored, so that the color-changing silica gel block can be reused, which is conducive to reflecting the concept of environmental protection.

[0023] Preferably, the detection channel is provided in a plurality of ways, and the first connecting pipe is provided in a corresponding manner to the detection channel, and the second connecting pipe is provided in a corresponding manner to the detection channel.

[0024] By adopting the above technical solution, multiple tests can be conducted on the same batch of dehydrated biogas, which helps to improve the accuracy of the test.

[0025] Preferably, the dehydration body includes a dehydration section and an air storage section, the air inlet is located in the dehydration section, the detection channel is connected to the air storage section, and the detection channel is located above the air storage section.

[0026] By adopting the above technical solution, in actual use, the biogas filtered by the filter enters the dehydration section from the air inlet for dehydration, and the dehydrated biogas enters the gas storage section and accumulates there. The detection channel is set above the gas storage section so that the biogas can enter the detection channel evenly from the gas storage section.

[0027] Preferably, the detection channel is provided with a viewing window for observing the water-absorbing and color-changing component.

[0028] By adopting the above technical solution and opening a viewing window, it is convenient to observe and detect the color change of the water-absorbing color-changing component in the detection channel.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. By using a water-absorbing and color-changing component to detect the water content in the dehydrated biogas, the residual water in the biogas after dehydration is reduced, which in turn helps to reduce the amount of water remaining in the gas storage tank and reduces the possibility of the gas storage tank being damaged by the water in the biogas.

[0031] 2. Rotate the regulating disc to control the opening and closing of gas outlet one and gas outlet two, making it convenient to control the flow direction of biogas in the detection channel;

[0032] 3. After the color-changing silica gel block changes color, rotate the turntable to allow the color-changing silica gel block to enter the drying oven, so that another color-changing silica gel block covers the detection channel. The color-changing silica gel block that enters the drying oven is heated and restored, so that the color-changing silica gel block can be reused, which is conducive to the concept of environmental protection. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this embodiment.

[0034] Figure 2 This is a partial cross-sectional view of the gas storage section and the fixing nail frame in this embodiment, mainly showing the internal structure of the dehydrator.

[0035] Figure 3 This is a partial sectional view of the implementation, mainly showing the structure of the dehydration section.

[0036] Figure 4 This is a partial exploded view of this embodiment, mainly showing the structure at the mounting bracket.

[0037] Figure 5 This is a structural diagram of the fixing frame from another perspective, mainly showing the structure of the limiting groove.

[0038] Explanation of reference numerals in the attached drawings: 1. Filter; 2. Dehydrator; 21. Dehydration body; 211. Dehydration section; 2111. Receiving cavity; 2112. Air inlet; 2113. Drive motor; 2114. Condenser; 2115. Water collection box; 212. Air storage section; 2121. Air storage chamber; 2122. Chamber 1; 2123. Chamber 2; 213. Fixing frame; 2131. Limiting groove; 2132. Limiting surface 1; 2133. Limiting surface 2; 2134. Connecting hole 1; 214. Air outlet pipe; 22. Detection channel; 221. Pipe section 1; 222. Pipe section 2; 2221. Air outlet 2; 2222. Air outlet 1 ; 23. Connecting pipe one; 24. Connecting pipe two; 25. Drying oven; 26. Viewing window; 3. Desulfurization tower; 4. Fine filter; 5. Gas storage tank; 6. Centrifuge cylinder; 61. Through hole; 7. Sealing assembly; 71. Adjusting disc; 711. Limiting block; 72. Sealing component one; 721. Sealing ring; 7211. Connection port; 73. Sealing component two; 74. Opening; 75. Sliding groove; 76. Transmission rod; 77. Damping block; 8. Water absorption and color changing assembly; 81. Turntable; 811. Drive rod two; 8111. Guide surface two; 812. Air hole; 82. Water absorption and color changing component; 9. Cover plate; 91. Drive rod one; 911. Guide surface one. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings.

[0040] This application discloses a biogas purification system. (Refer to...) Figure 1 A biogas purification system includes a filter 1, a dehydrator 2, a desulfurization tower 3, a fine filter 4, and a gas storage tank 5. The collected biogas is passed into the filter 1, where the filter 1 filters out solids in the biogas. The filtered biogas is then passed into the dehydrator 2 for dehydration, then into the desulfurization tower 3 for desulfurization, and then into the fine filter 4 for further filtration before entering the gas storage tank 5 for pressurized storage. The filter 1 and the dehydrator 2, the desulfurization tower 3 and the fine filter 4, and the fine filter 4 and the gas storage pipe are all connected by pipelines.

[0041] Reference Figure 2 The dehydrator 2 includes a dehydration body 21 and several detection channels 22. The dehydration body 21 includes a dehydration section 211 and a gas storage section 212. The dehydration section 211 is located inside the gas storage section 212 and is fixedly connected to the gas storage section 212. The detection channels 22 are located above the gas storage section 212 and are fixedly connected to the gas storage section 212.

[0042] Reference Figure 1 and Figure 3The dehydration section 211 has a receiving cavity 2111, and a centrifuge cylinder 6 is rotatably connected to the dehydration section 211. The centrifuge cylinder 6 is located inside the receiving cavity 2111, and the rotation axis of the centrifuge cylinder 6 is vertically arranged. The dehydration section 211 has an air inlet 2112, which passes through the gas storage section 212 in a vertical direction and is located on the side above the dehydration section 211. The air inlet 2112 is connected to the centrifuge cylinder 6. The biogas filtered by the filter 1 enters the centrifuge cylinder 6 through the air inlet 2112 along the pipeline. A drive motor 2113 is fixed on the dehydration section 211. The output shaft of the drive motor 2113 is fixedly connected to the centrifuge cylinder 6. The drive motor 2113 drives the centrifuge cylinder 6 to rotate, and the centrifuge cylinder 6 is rotatably connected to the dehydration section 211 through the drive motor 2113.

[0043] Reference Figure 1 and Figure 3 Several condenser tubes 2114 are fixedly connected at equal intervals on the inner wall of the receiving cavity 2111. The condenser tubes 2114 are arranged around the outer periphery of the centrifuge cylinder 6. The condenser tubes 2114 are used to cool the centrifuge cylinder 6, so that the water vapor in the biogas entering the centrifuge cylinder 6 condenses into water droplets. The water droplets hang on the inner wall of the centrifuge cylinder 6 and flow down along the inner wall of the centrifuge cylinder 6. A water receiving box 2115 is fixed on the dehydration section 211. The water receiving box 2115 is located below the centrifuge cylinder 6. The water receiving box 2115 is used to collect water droplets on the inner wall of the centrifuge cylinder 6. A through hole 61 is opened on the lower end face of the centrifuge cylinder 6. The through hole 61 communicates with the receiving cavity 2111. An air outlet pipe 214 is fixed on the dehydration section 211. An air storage chamber 2121 is opened on the air storage section 212. The dehydration section 211 is located in the air storage chamber 2121. The air outlet pipe 214 is used to connect the receiving cavity 2111 and the air storage section 212, so that the biogas in the receiving cavity 2111 enters the air storage section 212.

[0044] Reference Figure 3 The gas storage chamber 2121 includes a first chamber 2122 and a second chamber 2123. The first chamber 2122 is located above the second chamber 2123. The dehydration section 211 is located inside the first chamber 2122. The first chamber 2122 is connected to the second chamber 2123. The gas storage chamber 2121 formed by splicing the first chamber 2122 and the second chamber 2123 is L-shaped. The detection channel 22 is located above the second chamber 2123 and is connected to the second chamber 2123.

[0045] Reference Figure 2The detection channel 22 includes pipe section 1 221 and pipe section 222. The dehydration body 21 also includes a fixing frame 213, which is fixed on the gas storage section 212. The two ends of pipe section 1 221 are fixedly connected to the gas storage section 212 and the fixing frame 213 respectively. Pipe section 222 is fixed on the fixing frame 213 and is vertically arranged. The fixing frame 213 has a connection hole 2134, through which pipe section 1 221 and pipe section 222 are connected.

[0046] Reference Figure 1 and Figure 4 A second outlet 2221 is provided at the end of pipe segment 222 furthest from pipe segment 221. An outlet 1 2222 is provided on the pipe wall of pipe segment 222. Outlet 2221 is located on the side of outlet 1 2222 furthest from pipe segment 221, and the extension direction of outlet 1 2222 is perpendicular to the extension direction of outlet 2221. A connecting pipe 24 is fixed to the gas storage section 212. The position and number of connecting pipes 24 correspond one-to-one with the position and number of pipe segments 222. Connecting pipes 24 are located on the side of the corresponding pipe segment 222 furthest from pipe segment 221 and are used to connect the corresponding outlet 2221 and the inlet 2112. A connecting pipe 23 is fixed to the mounting bracket 213. The position and number of connecting pipes 23 correspond one-to-one with the position and number of pipe segments 222. Connecting pipe 23 is used to connect the corresponding outlet 1 2222 and the desulfurization tower 3. A sealing component 7 is rotatably connected to the fixed frame 213. The sealing component 7 is located on the side of pipe section 222 away from pipe section 1 221. The sealing component 7 is used to seal the air outlet 1 2222 or the air outlet 2221.

[0047] Reference Figure 4 The sealing assembly 7 includes an adjusting plate 71, a first seal 72, and a second seal 73. The adjusting plate 71 is rotatably connected to the fixed frame 213, and the rotation axis of the adjusting plate 71 is vertical. The second seal 73 is fixed on the adjusting plate 71, and the position and number of the second seal 73 correspond one-to-one with the position and number of the second air outlet 2221. The second air outlet 2221 is located on the movement path of the corresponding second seal 73, and the second seal 73 is used to rotate and seal the corresponding second air outlet 2221. The adjusting plate 71 has several openings 74, the position and number of which correspond one-to-one with the position and number of the second air outlet 2221. The second air outlet 2221 is located on the movement path of the corresponding opening 74, and the second air outlet 2221 and the second connecting pipe 24 are connected through the openings 74. The second seal 73 and the openings 74 are arranged alternately.

[0048] Reference Figure 4The sealing element 72 is a sealing ring 721, which is fixed on the adjusting plate 71. The sealing ring 721 is arranged around the outer circumference of several pipe segments 222. The sealing ring 721 is located between the pipe segment 222 and the corresponding connecting pipe 23. The inner ring of the sealing ring 721 abuts against the pipe segment 222, sealing the air outlet 2222. The outer ring of the sealing ring 721 abuts against the connecting pipe 23, disconnecting the connection between the connecting pipe 23 and the pipe segment 222. The sealing ring 721 has a connection port 7211. The position and number of connection ports 7211 correspond one-to-one with the position and number of air outlets 2222. The air outlets 2222 are located on the rotation path of the connection port 7211. The connection port 7211 is used to connect the air outlet 2222 and the corresponding connecting pipe 23. The distribution of the connection port 7211 corresponds to the distribution of the second seal 73. When the second seal 73 seals the second air outlet 2221, the connection port 7211 is located between the first air outlet 2222 and the second connecting pipe 24, and the first air outlet 2222 is connected to the second connecting pipe 24.

[0049] Reference Figure 4 A water-absorbing and color-changing component 8 is rotatably connected to the fixed frame 213. The water-absorbing and color-changing component 8 is located between the pipe section 221 and the fixed frame 213. The water-absorbing and color-changing component 8 covers the pipe section 221, so that the biogas in the pipe section 221 enters the pipe section 222 after passing through the water-absorbing and color-changing component 8.

[0050] In actual use, the filtered biogas enters the centrifuge cylinder 6 through the air inlet 2112, causing water droplets condensed in the biogas to fall onto the inner wall of the centrifuge cylinder 6 and then fall into the water collection box 2115. The biogas in the centrifuge cylinder 6 enters the receiving cavity 2111 through the through hole 61, then enters the first chamber 2122 through the air outlet pipe 214, and then enters the second chamber 2123. As the biogas accumulates in the second chamber 2123, it enters the first pipe section 221 and moves along the first pipe section 221 towards the second pipe section 222. When the biogas enters the second pipe section 222 from the first pipe section 221, it passes through the water absorption and color-changing component 8. When the color changes, rotate the adjusting disc 71 so that the opening 74 connects the second gas outlet 2221 and the second connecting pipe 24. At this time, the sealing ring 721 blocks the first gas outlet 2222, allowing the biogas entering the second pipe section 222 to enter the second connecting pipe 24 from the second gas outlet 2221, and then re-enter the centrifuge 6 for dehydration from the inlet 2112 along the second connecting pipe 24. When the water absorption color changing component 8 does not change color, rotate the adjusting disc 71 so that the second sealing element 73 covers the second gas outlet 2221. At this time, the connecting port 7211 connects the first gas outlet 2222 and the first connecting pipe 23, allowing the biogas to enter the first connecting pipe 23 from the first gas outlet 2222 and then enter the desulfurization tower 3 for desulfurization.

[0051] Reference Figure 4 and Figure 5A limiting block 711 is fixed to one end of the adjusting plate 71 near the fixed frame 213. A limiting groove 2131 is formed on one end of the fixed frame 213 near the adjusting plate 71. The limiting groove 2131 allows the limiting block 711 to engage. The limiting block 711 moves within the limiting groove 2131. A limiting surface 1 2132 and a limiting surface 2133 are machined on the limiting groove 2131. The limiting surface 1 2132 and the limiting surface 2133 are located on the moving path of the limiting block 711. 2132 and limiting surface 2133 are used to abut against limiting block 711, limiting the limiting block 711 and thus limiting the rotation angle of adjusting disc 71. When limiting surface 2132 abuts against limiting block 711, sealing element 73 seals air outlet 2221, and air outlet 2222 is connected to connecting pipe 23. When limiting surface 2133 abuts against limiting block 711, sealing ring 721 seals air outlet 2222, and air outlet 2221 is connected to connecting pipe 24.

[0052] Reference Figure 4 The water-absorbing and color-changing component 8 includes a turntable 81 and several water-absorbing and color-changing elements 82. The turntable 81 is rotatably connected to a fixed frame 213 and is located between pipe section 221 and the fixed frame 213. The rotation axis of the turntable 81 is parallel to the rotation axis of the adjusting plate 71. Several water-absorbing and color-changing elements 82 are evenly distributed at equal intervals on the turntable 81 around its outer circumference. The end of pipe section 221 near the fixed frame 213 is located on the moving path of the water-absorbing and color-changing elements 82. The water-absorbing and color-changing elements 82 are used to cover pipe section 221 and detect the moisture content of biogas inside pipe section 221. The water-absorbing and color-changing elements 82 are color-changing silica gel blocks.

[0053] Reference Figure 4 A drying box 25 is fixed above the fixed frame 213, the adjusting plate 71 is located inside the drying box 25, and the end of the pipe section 221 near the fixed direction extends into the drying box 25.

[0054] In practical use, to reduce the impact of discoloration on subsequent observations, the water-absorbing color-changing component 82 needs to be replaced. At this time, the turntable 81 is rotated to move another water-absorbing color-changing component 82 between pipe section 221 and the fixing frame 213. The water-absorbing color-changing component 82 removed from between pipe section 221 and the fixing frame 213 enters the drying chamber 25. Since the color-changing silica gel block can dehydrate and recover at high temperatures, the water-absorbing color-changing component 82 dehydrates and recovers after entering the drying chamber 25. This makes replacing the water-absorbing color-changing component 82 convenient and allows it to be reused, which is beneficial for embodying the concept of environmental protection.

[0055] Reference Figure 4 A viewing window 26 is provided on pipe section 221. The viewing window 26 is located directly above the water-absorbing color-changing component 82. The viewing window 26 is used for staff to observe the color change of the water-absorbing color-changing component 82.

[0056] Reference Figure 3 A cover plate 9 is rotatably connected to the gas storage section 212. The rotation axis of the cover plate 9 is parallel to the rotation axis of the turntable 81. The cover plate 9 is located above the second chamber 2123 and between the first pipe section 221 and the gas storage section. The cover plate 9 is used to rotate and close the first pipe section 221. The cover plate 9 is used to control the opening and closing between the second chamber 2123 and the first pipe section 221.

[0057] During the actual dehydration process, after the water-absorbing and color-changing component 8 changes color, the cover plate 9 is rotated to disconnect the second chamber 2123 and the first pipe section 221, preventing the biogas in the second chamber 2123 from continuing to enter the first pipe section 221 and mix with the incompletely dehydrated biogas in the pipe section.

[0058] Reference Figure 2 and Figure 4 When the cover plate 9 rotates to connect the second chamber 2123 and the first pipe section 221, the rotation direction is the same as the rotation direction of the turntable 81. From a top view, both are clockwise. There is a gap between the gas storage section 212 and the fixed frame 213. The gap is located between the cover plate 9 and the turntable 81. The adjusting plate 71 is located below the turntable 81. The diameter of the adjusting plate 71 is larger than the diameter of the turntable 81. Part of the adjusting plate 71 is located in the gap. A sliding groove 75 is opened on the upper end face of the adjusting plate 71. The sliding groove 75 is located in the gap. A transmission rod 76 is slidably connected to the adjusting plate 71. The transmission rod 76 is located above the adjusting plate 71. The transmission rod 76 is slidably connected in the sliding groove 75. The sliding direction of the transmission rod 76 is consistent with the radial direction of the adjusting plate 71. The transmission rod 76 is vertically set. The rotation of the adjusting plate 71 drives the transmission rod 76 to move.

[0059] Reference Figure 2 and Figure 4 A drive rod 91 is fixed on the cover plate 9. The drive rod 91 is located on the side of the cover plate 9 near the turntable 81, and the length direction of the drive rod 91 is consistent with the radial direction of the cover plate 9. The rotation angle of the cover plate 9 is greater than the rotation angle of the adjusting plate 71. Several drive rods 811 are fixed on the turntable 81. The drive rods 811 are arranged around the outer circumference of the turntable 81. The position and number of drive rods 811 correspond one-to-one with the position and number of water-absorbing and color-changing components 82. The drive rods 811 protrude from the drying box 25. The included angle between adjacent drive rods 811 is greater than twice the rotation angle of the adjusting plate 71. Several air holes 812 are opened on the turntable 81. The air holes 812 are evenly distributed between adjacent water-absorbing and color-changing components 82. In this embodiment, the rotation angle of the adjusting plate 71 is 20°, the rotation angle of the drive rods 811 in one rotation is 60°, and the rotation angle of the cover plate 9 is 60°.

[0060] Reference Figure 2 and Figure 4The distance between the cover plate 9 and the rotating shaft of the turntable 81 is greater than the sum of the radii of the cover plate 9 and the turntable 81, but less than the sum of the maximum distances from the drive rod 1 91 to the rotating shaft of the cover plate 9 and the maximum distances from the drive rod 2 811 to the rotating shaft of the turntable 81. The transmission rod 76 is located between the adjacent drive rod 1 91 and drive rod 2 811. The drive rod 1 91 and drive rod 2 811 are used to abut against the transmission rod 76 to drive the transmission rod 76 to move, thereby driving the adjusting disc 71 to rotate.

[0061] Reference Figure 2 and Figure 4 A guide surface 911 is machined on the drive rod 91. The guide surface 911 is located on the side of the drive rod 91 closest to the transmission rod 76. The guide surface 911 is inclined, tilting away from the direction away from the rotation axis of the cover plate 9 and away from the transmission rod 76. The guide surface 911 is used to abut against the transmission rod 76, driving the transmission rod 76 to move, so that the second seal 73 seals the second air outlet 2221. In this embodiment, the second seal 73 is a sealing plate.

[0062] Reference Figure 2 and Figure 4 A guide surface 8111 is machined on the drive rod 811. The guide surface 8111 is located on the side of the drive rod 811 closest to the transmission rod 76 and on the side of the drive rod 811 closest to the rotation direction of the turntable 81. The guide surface 8111 is inclined. The guide surface 8111 on the drive rod 811 closest to the transmission rod 76 is inclined away from the rotation axis of the turntable 81 and away from the transmission rod 76. The guide surface 8111 is used to abut against the transmission rod 76, drive the adjusting plate 71 to rotate, and then drive the sealing ring 721 to rotate so that the connection port 7211 is separated from the air outlet 2221, and the sealing ring 721 covers the air outlet.

[0063] Reference Figure 2 and Figure 4 A damping block 77 is fixed on the transmission rod 76. The damping block 77 is located in the sliding groove 75. It increases the friction between the transmission rod 76 and the adjusting plate 71 when the transmission rod 76 slides. This causes the drive rod 91 or the drive rod 811 to abut against the transmission rod 76 and drive the adjusting plate 71 to rotate. During this process, the friction between the transmission rod 76 and the adjusting plate 71 is greater than the friction when the adjusting plate 71 rotates.

[0064] Before testing, chamber 2123 is connected to pipe section 221, and the limiting block 711 abuts against the limiting surface 2132. At this time, the sealing ring 721 seals the gas outlet 2222, and the gas outlet 2221 is connected to the connecting pipe 24. The transmission rod 76 is located on the moving path of the drive rod 811. The biogas in chamber 2123 flows along pipe section 221, passes through the water-absorbing color-changing component 82, and enters pipe section 222. The staff observes through the viewing window 26 whether the water-absorbing color-changing component 82 at pipe section 221 changes color. If the water-absorbing color-changing component 82 changes color, the cover plate 9 is rotated to disconnect pipe section 221 and chamber 2123, preventing biogas from continuing to enter pipe section 221. Then, the turntable 81 is rotated, and the turntable 81 drives the transmission rod 76 to move through the drive rod 811. Since the friction of the adjusting plate 71 when rotating is less than that of the transmission rod... During the sliding motion, friction causes the adjusting disc 71 to rotate. This rotation causes the limiting block 711 to move closer to the limiting surface 2133 until the limiting block 711 comes into contact with the limiting surface 2133, preventing the adjusting disc 71 from rotating further. At this point, the air holes 812 of the pipe section 1 221 and pipe section 222 are connected, the air outlet 1 2222 is closed, and the air outlet 2221 is connected to the connecting pipe 24, allowing the biogas in pipe section 1 221 and pipe section 222 to re-enter the dehydration section 211 along the connecting pipe 24.

[0065] Continue rotating the turntable 81 to move the next water-absorbing color-changing component 82 between pipe section 1 221 and pipe section 2 222. During this process, the adjusting disc 71 cannot rotate, and the transmission rod 76 abuts against the guide surface 2 8111. The transmission rod 76 overcomes friction and moves along the inclined direction of the guide surface 2 8111 towards the cover plate 9 to disengage from the drive rod 2 811, so that the transmission rod 76 enters the movement path of the drive rod 1 91. After the water-absorbing color-changing component 82 is moved between pipe section 1 221 and pipe section 222, the cover plate 9 is rotated to connect chamber 2123 and pipe section 221. At this time, the rotation direction of the cover plate 9 is the same as that of the turntable 81, causing the drive rod 91 to abut against the transmission rod 76 and drive the adjusting plate 71 to rotate. This causes the limiting block 711 to move towards the limiting surface 2132. When the limiting block 711 abuts against the limiting surface 2132, the second air outlet 2221 closes, and the first air outlet 2222 connects to the connecting pipe 23. The cover plate 9 continues to rotate, causing the transmission rod 76 to abut against the guide surface 911. The transmission rod 76 overcomes friction and moves along the inclined direction of the guide surface 911 towards the turntable 81, disengaging from the drive rod 91. This allows the transmission rod 76 to enter the movement range of the drive rod 91, facilitating the opening of the second air outlet 2221 next time. In this embodiment, both the turntable 81 and the cover plate 9 are driven to rotate by the drive motor 2113.

[0066] The implementation principle of a biogas purification system according to an embodiment of this application is as follows: During biogas purification, solids in the biogas are first removed through a filter 1 before being introduced into a centrifuge 6. Water vapor in the biogas is condensed into droplets, which are then separated from the biogas. The dehydrated biogas passes through chamber one 2122, chamber two 2123, pipe section one 221, and pipe section two 222. When the biogas enters pipe section two 222 from pipe section one 221, the moisture content in the biogas is detected by a water-absorbing color-changing element 82. The adjusting disc 71 is rotated according to the deformation of the water-absorbing color-changing element 82. When the water-absorbing color-changing element 82 changes color, water still exists in the biogas. The adjusting disc 71 is then rotated. The sealing ring 721 seals the first gas outlet 2222, and the second gas outlet 2221 is connected to the second connecting pipe 24, allowing the biogas to re-enter the centrifuge 6 for secondary dehydration. When the color of the water-absorbing color-changing component 82 remains unchanged, the adjusting disc 71 is rotated to connect the first gas outlet 2222 to the first connecting pipe 23, and the sealing component 73 seals the second gas outlet 2221, allowing the gas to enter the desulfurization tower 3 from the first connecting pipe 23 for desulfurization. The biogas desulfurized in the desulfurization tower 3 enters the gas storage tank 5 after passing through the fine filter 4, reducing the possibility of incomplete dehydration of the biogas when passing through the dehydrator 2, thereby reducing the amount of water entering the gas storage tank 5 and improving the service life of the gas storage tank 5.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biogas purification system, comprising a filter (1), a dehydrator (2), a desulfurization tower (3), a fine filter (4), and a gas storage tank (5), wherein biogas is purified sequentially by the filter (1), the dehydrator (2), the desulfurization tower (3), and the fine filter (4) and stored in the gas storage tank (5), characterized in that: The dehydrator (2) includes a dehydration body (21) and a detection channel (22) disposed on the dehydration body (21). The dehydration body (21) is provided with a water absorption and color-changing component (8), which extends into the detection channel (22) and is used to detect the water content in the detection channel (22). The dehydration body (21) is provided with an air inlet (2112), and the detection channel (22) is provided with an air outlet one (2222) and an air outlet two. (2221) The dehydration body (21) is provided with a sealing component (7), which is used to block the first air outlet (2222) or the second air outlet (2221). The dehydration body (21) is provided with a connecting pipe (23) and a connecting pipe (24). The first connecting pipe (23) is used to connect the first air outlet (2222) and the desulfurization tower (3). The second connecting pipe (24) is used to connect the second air outlet (2221) and the air inlet (2112). The sealing assembly (7) includes an adjusting disc (71) rotatably connected to the dehydration body (21), a first sealing element (72) and a second sealing element (73) disposed on the adjusting disc (71). The adjusting disc (71) has an opening (74). The second air outlet (2221) is located on the rotation path of the second sealing element (73) and the opening (74). The opening (74) is used to communicate with the second air outlet (2221). The first air outlet (2222) is located on the rotation path of the first sealing element (72). When the second sealing element (73) blocks the second air outlet (2221), the first air outlet (2222) is connected to the first connecting pipe (23). When the opening (74) is connected to the second air outlet (2221), the first sealing element (72) blocks the first air outlet (2222). The water-absorbing color-changing component (8) includes a turntable (81) rotatably connected to the dehydration body (21) and a plurality of water-absorbing color-changing elements (82) disposed on the turntable (81), and the detection channel (22) is located on the moving path of the water-absorbing color-changing elements (82); A cover plate (9) is rotatably connected to the dehydration body (21), and the cover plate (9) is used to rotatably cover one end of the detection channel (22) near the dehydration body (21); The rotation axes of the cover plate (9), the turntable (81), and the adjusting plate (71) are parallel to each other. The rotation direction of the turntable (81) is the same as the rotation direction of the cover plate (9) when the detection channel (22) is opened. A transmission rod (76) is slidably connected to the adjusting plate (71). The sliding direction of the transmission rod (76) is consistent with the radial direction of the adjusting plate (71). A drive rod one (91) is provided on the cover plate (9), and several drive rod two (811) are provided on the turntable (81). The drive rod two (811) is correspondingly arranged with the water-absorbing color-changing component (82). The transmission rod (76) is located between adjacent drive rod one (91) and drive rod two (811). A guide surface one (911) is provided on the drive rod one (91). The guide surface one (911) is oriented away from the rotation axis of the cover plate (9) and away from the transmission rod (76). The drive rod (811) is inclined, and a guide surface (8111) is provided on the second drive rod (8111). The guide surface (8111) is inclined in a direction away from the rotation axis of the cover plate (9) and away from the transmission rod (76). The guide surface (911) and the guide surface (8111) are used to abut against the transmission rod (76). The sliding friction of the transmission rod (76) is greater than the rotation friction of the adjustment disk (71). The adjustment disk (71) is provided with a limiting block (711). The limiting block (711) is used to limit the rotation angle of the adjustment disk (71). The distance between the rotation axis of the cover plate (9) and the turntable (81) is greater than the sum of the radii of the cover plate (9) and the turntable (81), and less than the sum of the maximum distance from the drive rod (91) to the rotation axis of the cover plate (9) and the maximum distance from the drive rod (811) to the axis of the turntable (81).

2. The biogas purification system according to claim 1, characterized in that: The included angle between adjacent drive rods (811) is greater than twice the rotation angle of the transmission rod (76). The turntable (81) is open and has a plurality of air holes (812), which are located between adjacent water-absorbing color-changing components (82).

3. The biogas purification system according to claim 1, characterized in that: The water-absorbing color-changing component (82) is a color-changing silicone block. The dehydration body (21) is equipped with a drying box (25). The turntable (81) is located inside the drying box (25). The detection channel (22) passes through the drying box (25).

4. The biogas purification system according to claim 1, characterized in that: The detection channel (22) is provided in several ways. The first connecting pipe (23) is provided in correspondence with the detection channel (22), and the second connecting pipe (24) is provided in correspondence with the detection channel (22).

5. The biogas purification system according to claim 4, characterized in that: The dehydration body (21) includes a dehydration section (211) and a gas storage section (212). The air inlet (2112) is located in the dehydration section (211). The detection channel (22) is connected to the gas storage section (212) and is located above the gas storage section (212).

6. The biogas purification system according to claim 1, characterized in that: The detection channel (22) is provided with a viewing window (26), which is used to observe the water-absorbing color-changing component (8).

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