A series type biogas purification and desulfurization treatment equipment

Abstract

The present application relates to the technical field of excrement waste gas treatment, in particular to a series connection type marsh gas purification desulfurization treatment equipment, which comprises a desulfurization recovery equipment; the inside of the desulfurization recovery equipment is divided into a dynamic spray desulfurization zone and a static settlement desulfurization zone by a gravity plate; the dynamic spray desulfurization zone is sequentially provided with a first spray pipe and a porous tray from top to bottom; the static settlement desulfurization zone is provided with an aeration cylinder; the desulfurization recovery equipment is provided with an air inlet pipe, an air outlet pipe and a recovery pipe; the gravity plate is provided with a drainage assembly for draining the spray waste liquid from the dynamic spray desulfurization zone to the static settlement desulfurization zone; the equipment divides the inside of the equipment into the dynamic marsh gas spray desulfurization zone and the static waste liquid oxidation elemental sulfur zone by the gravity plate, thereby improving the recovery and treatment efficiency of the waste liquid while maintaining the desulfurization effect.

Description

Technical Field

[0001] This invention relates to the field of sewage and waste gas treatment technology, specifically to a series biogas purification and desulfurization treatment device. Background Technology

[0002] When using pig manure, chicken manure, or cow manure as raw materials for anaerobic fermentation, the biogas produced by the anaerobic digester is a mixed gas containing saturated water vapor. Besides the gaseous fuels CH4 and CO2, it also contains H2S and suspended particulate impurities. The H2S in the biogas is not only toxic but also highly corrosive. Based on the biogas production from the raw materials, the hydrogen sulfide content in the biogas produced is estimated to be approximately 4,000 ppm to 10,000 ppm. If the raw materials are not desulfurized and directly enter the subsequent utilization system, it will cause severe corrosion to the equipment. Therefore, desulfurization of the biogas is necessary to reduce the hydrogen sulfide content.

[0003] Existing biogas desulfurization towers primarily perform desulfurization. The spray wastewater after SO2 absorption typically needs to be discharged outside the tower and enter a separate, dedicated oxidation tower or reaction tank for forced oxidation and gypsum crystallization. This split design results in numerous pieces of equipment and long process pipelines in the entire desulfurization system, potentially leading to a large footprint. Furthermore, if the spray wastewater cannot be oxidized promptly and effectively, it not only hinders the resource utilization of byproducts but may also affect desulfurization efficiency and even cause system operational problems due to the accumulation of byproducts. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a series biogas purification and desulfurization treatment device.

[0005] A series biogas purification and desulfurization treatment device, including a desulfurization recovery device; The desulfurization and recovery equipment is internally divided into a dynamic spray desulfurization zone and a static sedimentation sulfur recovery zone by a gravity plate. The dynamic spray desulfurization zone is provided with a first spray pipe and a porous tray from top to bottom; the static sedimentation sulfur-collecting zone is provided with an aeration cylinder for oxidizing sulfides in the spray waste liquid to obtain elemental sulfur. The desulfurization and recovery equipment is equipped with an air inlet pipe that communicates with the dynamic spray desulfurization zone located below the porous tray and an air outlet pipe that communicates with the dynamic spray desulfurization zone located above the spray tray. The gravity plate is equipped with a drainage component for discharging spray waste liquid from the dynamic spray desulfurization zone to the static sedimentation sulfur-recovery zone. The inner wall of the desulfurization recovery equipment is provided with a longitudinal chute. The bottom of the gravity plate is slidably sealed to the longitudinal chute through an annular liquid pump. The annular liquid pump is externally connected to a pressure relief device. The drainage component includes a liquid outlet hole on the gravity plate, a baffle on the top of the gravity plate for blocking the liquid outlet hole when the gravity plate is at its highest point, and a shaft for connecting the baffle to the side wall of the desulfurization recovery equipment. The baffle is hemispherical.

[0006] Furthermore, the desulfurization recovery equipment is equipped with a reflux pump, and the desulfurization recovery equipment is equipped with multiple second spray pipes arranged alternately with the first spray pipe. The water inlet pipe of the reflux pump is connected to the dynamic spray desulfurization zone located between the gravity plate and the air inlet pipe, and the water outlet pipe of the reflux pump is connected to multiple second spray pipes.

[0007] Explanation: By setting up multiple second spray pipes that are staggered with the first spray pipe, a dense and uniform spray coverage area can be formed in the desulfurization tower. This greatly increases the contact area and contact opportunities between the spray liquid and biogas. The return pump directly extracts the spray liquid participating in the reaction in the dynamic spray desulfurization zone and sprays it out again through the second spray pipe. This allows the spray liquid to be used multiple times and fully, ensuring that sulfur-containing and other harmful substances in the biogas can be absorbed and removed more thoroughly. It also enables the waste liquid after use to be reused for resource recovery, thereby improving the utilization efficiency of the spray liquid.

[0008] Furthermore, the porous tray has two layers, and one layer of the porous tray is rotatably and sealed to the inner wall of the desulfurization and recovery equipment. The air inlet pipe is equipped with an adjustment component that adjusts the size of the holes connecting the two porous trays according to the amount of biogas. The adjustment assembly includes an orifice plate disposed in the air inlet pipe, a limiting plate, a first airbag rod connecting the orifice plate and the limiting plate, a connecting rod disposed on a rotatable porous tray and penetrating the through groove of the side wall of the desulfurization and recovery equipment, and a second airbag rod disposed on the through groove. The second airbag rod is connected to the first airbag rod, and the second airbag rod is hinged to the connecting rod.

[0009] Explanation: The double-layer design of the porous tray improves flow uniformity, ensuring that biogas rises evenly across the entire cross-section of the dynamic spray desulfurization zone, making full and uniform contact with the sprayed slurry. This avoids localized airflow short-circuiting or dead zones, thus improving the overall desulfurization effect. The kinetic energy of the biogas flow drives the perforated plate to compress the first airbag rod, which in turn drives the second airbag rod to move the connecting rod, rotating one layer of the porous tray so that its holes are misaligned or overlapped with those of the other layer. When the biogas volume increases, the thrust of the airflow in the inlet pipe on the perforated plate increases. Through the linkage of the first and second airbag rods, the rotatable tray layer is driven to rotate. This causes the holes on the two trays to change from being completely aligned to partially misaligned, reducing the effective ventilation area. This prevents the biogas flow rate from being too low under high load, avoiding the slurry being carried upwards by the biogas and unable to flow smoothly downwards, thus effectively suppressing flooding and ensuring the stable operation of the desulfurization tower. When the biogas volume decreases, the mechanism will increase the alignment of the tray holes, increasing the effective ventilation area and helping to reduce system resistance. At the same time, regardless of the load, the staggered porous trays can continuously cut the rising airflow into smaller bubbles or turbulence, making the gas-liquid contact more sufficient, thereby maintaining high desulfurization efficiency. Furthermore, the adjustment is made by the orifice plate according to the movement of the air volume, without the need for an external electric drive adjustment mechanism, reducing system energy consumption and achieving energy saving.

[0010] Furthermore, the first spray pipe is equipped with a regulating valve to control the spray volume of the first spray pipe, and the air inlet pipe is equipped with a sensor to sense the air volume. The sensor and the regulating valve are electrically connected through a PLC system.

[0011] Explanation: The spray volume of the first spray pipe is controlled by the regulating valve. When the biogas volume is small or the H2S concentration is low, the system will automatically reduce the spray volume, directly saving the power consumption of the spray pump and the consumption of spray liquid. Since the utilization efficiency of the spray liquid is maximized, the amount of waste liquid generated will also be reduced accordingly. This not only reduces the cost of waste liquid treatment agents and energy consumption, but also alleviates the pressure of environmental protection treatment. The automated system can quickly respond to sudden changes in the gas intake conditions (for example, a sudden increase in biogas production) and automatically increase the spray volume, effectively avoiding the decrease in desulfurization efficiency or excessive emissions caused by fluctuations in operating conditions. It can effectively coordinate cost and treatment efficiency.

[0012] Furthermore, the desulfurization recovery equipment is connected to a generator that generates electricity using desulfurized biogas, and the generator is electrically connected to the sensor via a PLC system.

[0013] Explanation: Utilizing biogas for power generation serves two purposes. First, it involves the energy conversion of biogas, transforming methane into energy, reducing direct emissions, and contributing to the goals of carbon peaking and carbon neutrality. Second, it enables the equipment to generate its own electricity, reducing the cost of purchased electricity and directly lowering the system's operating electricity costs.

[0014] Furthermore, the air inlet pipe is connected to the air outlet of the manure fermentation equipment, the air outlet pipe is connected to the air inlet of the gas storage tank, and a recovery pipe connected to the dehydration equipment is provided on the side wall of the static sedimentation sulfur-collecting zone.

[0015] Explanation: Connecting the relevant biogas generation and collection structures in series with biogas treatment equipment enables automatic and uninterrupted purification and transportation of biogas, reducing intermediate steps and energy losses, and facilitating streamlined operations; the elemental sulfur generated in the static sedimentation sulfur-gathering zone can be introduced into subsequent dehydration equipment or a dedicated collection device through a recovery pipe; this not only prevents the accumulation of harmful substances in the equipment, but also realizes the recycling of sulfur resources.

[0016] Furthermore, the bottom of the sulfur zone obtained by static settling is conical.

[0017] Explanation: The conical structure provides a gradual settling space, allowing elemental sulfur to naturally slide to the discharge port at the bottom center, effectively preventing solid particles from accumulating at the bottom of the equipment and forming dead corners. This ensures the solid-liquid separation effect and facilitates collection. The inclined walls of the conical structure make it difficult for solids such as sulfur to adhere and accumulate, reducing the risk of blockage and minimizing sedimentation dead corners, making the equipment easier to clean and maintain.

[0018] Furthermore, a demister is installed inside the desulfurization and recovery equipment located above the first spray pipe.

[0019] Note: During the desulfurization process, after the flue gas and desulfurization slurry fully contact and react, a large number of slurry droplets will be carried. The demister can capture and separate these droplets to prevent them from continuing to flow with the flue gas; and can effectively prevent droplet blockage.

[0020] Compared with existing biogas purification and desulfurization equipment, the advantages of this invention are: (1) The present invention divides the desulfurization and recovery equipment into a dynamic spray zone for treating biogas, so that the upper biogas spray desulfurization process can be carried out continuously. The gravity plate and its drainage components ensure that only spray waste liquid that has reached a certain liquid level can flow into the static zone, and at the same time, it can effectively prevent the gas in the static zone from rising to the dynamic zone. The design of the hemispherical baffle helps to disperse the liquid and reduce the impact and wear on the valve seat. The lower elemental sulfur regeneration treatment can be carried out in batches. The two are combined in space and decoupled in time, without interfering with each other. This division of labor avoids the interference of high-speed fluid flow on the sedimentation process of fine sulfur particles, and simultaneously improves the desulfurization accuracy and sulfur recovery efficiency, ensuring the stability and efficiency of the main desulfurization process. Compared with the dry desulfurization agent that needs to be discarded or the wet process that produces sulfur-containing waste liquid, in the static sedimentation sulfur-recovery zone, air is injected through the aeration tube to oxidize the sulfides absorbed by the spray liquid into elemental sulfur. This sulfur settles in solid form, making it easy to collect and recycle, turning waste into treasure. It is a cleaner and more thorough treatment method that fixes and utilizes sulfur, avoiding the generation of waste.

[0021] (2) By setting up multiple second spray pipes and alternating them with the first spray pipe, the device of the present invention can form a dense and uniform spray coverage area in the desulfurization tower, which greatly increases the contact area and contact opportunity between the spray liquid and biogas. The return pump directly extracts the spray liquid participating in the reaction in the dynamic spray desulfurization zone and sprays it out again through the second spray pipe. This allows the spray liquid to be used multiple times and fully, ensuring that sulfur-containing and other harmful substances in biogas can be absorbed and removed more thoroughly. It can also reuse the waste liquid after use and improve the utilization efficiency of the spray liquid.

[0022] (3) The device of the present invention is designed with a double-layer porous tray, which makes the flow uniformity better and ensures that the biogas rises evenly across the entire cross section of the tower and comes into full and uniform contact with the sprayed slurry, avoiding the formation of local airflow short circuits or dead zones, thereby improving the overall desulfurization effect; and the flow kinetic energy of biogas drives the perforated plate to squeeze the first airbag rod, thereby driving the second airbag rod to move the docking rod, and then rotating one layer of porous tray so that the holes of the other layer of porous tray are misaligned or overlapped. When the biogas volume increases, the thrust of the airflow in the inlet pipe on the perforated plate increases. Through the linkage of the first airbag rod and the second airbag rod, the rotatable tray layer will be driven to rotate; this makes the holes on the two layers of trays change from being completely aligned to being partially misaligned, and the effective ventilation area is reduced. This prevents the biogas flow rate from being too low under high load, avoiding the slurry being carried upwards by the biogas and unable to flow smoothly downwards, thus effectively suppressing flooding and ensuring the stable operation of the desulfurization tower. When the biogas volume decreases, the mechanism will increase the alignment of the tray holes, increasing the effective ventilation area and helping to reduce system resistance. At the same time, regardless of the load, the staggered porous trays can continuously cut the rising airflow into smaller bubbles or turbulence, making the gas-liquid contact more sufficient, thereby maintaining high desulfurization efficiency. Furthermore, the adjustment is made by the orifice plate according to the movement of the air volume, without the need for an external electric drive adjustment mechanism, reducing system energy consumption and achieving energy saving. Attached Figure Description

[0023] Figure 1 This is an overall appearance view of Embodiment 1 of the desulfurization treatment equipment of the present invention; Figure 2 This is an internal structural diagram of Embodiment 1 of the desulfurization treatment equipment of the present invention; Figure 3 This is a diagram showing the distribution of the liquid outlet structure of Embodiment 1 of the desulfurization treatment equipment of the present invention; Figure 4 This is an internal structural diagram of Embodiment 2 of the desulfurization treatment equipment of the present invention; Figure 5 This is a structural diagram of the adjustment component of Embodiment 2 of the desulfurization treatment equipment of the present invention; Figure 6 This is a connection structure diagram of the first airbag rod and the second airbag rod in Embodiment 2 of the desulfurization treatment equipment of the present invention; Figure 7 This is a structural diagram of the connecting rod of Embodiment 2 of the desulfurization treatment equipment of the present invention; In the diagram: 1-Desulfurization and recovery equipment, 11-Inlet pipe, 111-Orifice plate, 112-Limiting plate, 113-First airbag rod, 12-Outlet pipe, 13-Recovery pipe, 2-Dynamic spray desulfurization zone, 21-First spray pipe, 22-Porous tray, 221-Connecting rod, 222-Second airbag rod, 3-Static sedimentation sulfur-receiving zone, 31-Aeration cylinder, 4-Gravity plate, 41-Liquid outlet pipe, 42-Annular liquid pump, 43-Baffle, 44-Shaft rod. Detailed Implementation

[0024] To further illustrate the methods and effects of this invention, the technical solution of this invention will be clearly and completely described below in conjunction with experiments.

[0025] Example 1: A series biogas purification and desulfurization treatment device, from Figure 1 It can be seen that this includes desulfurization and recovery equipment 1; from Figure 2 It can be seen that the desulfurization and recovery equipment 1 is divided into a dynamic spray desulfurization zone 2 and a static sedimentation sulfur collection zone 3 by gravity plate 4. from Figure 2 As can be seen, the dynamic spray desulfurization zone 2 is provided with a first spray pipe 21 and a porous tray 22 from top to bottom, and a demister is provided inside the wet desulfurization tower 2 located above the first spray pipe 21. from Figure 2 It can be seen that the static sedimentation sulfur-gathering zone 3 is equipped with an aeration cylinder 31 for oxidizing sulfides in the spray waste liquid to obtain elemental sulfur; in order to improve the yield of elemental sulfur, temperature control equipment and catalyst addition equipment can also be installed in the static sedimentation sulfur-gathering zone 3. from Figure 2 As can be seen, the desulfurization recovery equipment 1 is provided with an air inlet pipe 11 that communicates with the dynamic spray desulfurization zone 2 located below the porous tray 22 and an air outlet pipe 12 that communicates with the dynamic spray desulfurization zone 2 located above the spray tray 21. The air inlet pipe 11 is located on the side wall of the desulfurization recovery equipment 1, and the air outlet pipe 12 is located on the top of the desulfurization recovery equipment 1. The air inlet of the air inlet pipe 11 is connected to the air outlet of the manure fermentation equipment, and the air outlet of the air outlet pipe 12 is connected to the air inlet of the gas storage tank. The side wall of the static sedimentation sulfur-receiving zone 3 is provided with a recovery pipe 13 that communicates with the dehydration equipment, that is, the outlet of the recovery pipe 13 is connected to the inlet of the dehydration equipment. from Figure 2 and Figure 3 It can be seen that the gravity plate 4 is provided with a drainage component for discharging the spray waste liquid from the dynamic spray desulfurization zone 2 to the static sedimentation sulfur-recovery zone 3; the inner wall of the desulfurization recovery equipment 1 is provided with a longitudinal sliding groove, and the bottom of the gravity plate 4 is slidably sealed to the longitudinal sliding groove through an annular liquid pump 42. The annular liquid pump 42 is externally connected to a pressure relief device (to facilitate the reset of the annular liquid pump 42). The drainage component includes a liquid outlet 41 provided on the gravity plate 4, a baffle 43 provided on the top of the gravity plate 4 for blocking the liquid outlet 41 when the gravity plate 4 is at its highest point, and a shaft 44 for connecting the baffle 43 and the side wall of the desulfurization recovery equipment 1. The baffle 43 is a hemispherical shape with an upward convex shape. from Figure 2It can be seen that the desulfurization recovery equipment 1 is equipped with a reflux pump 23, and the desulfurization recovery equipment 1 is equipped with multiple second spray pipes 24 arranged in a staggered manner with the first spray pipe 21. It can be understood that the staggered arrangement is as follows: the first spray pipe 21 and the second spray pipe 24 are arranged horizontally parallel on the same horizontal plane, the multiple first spray pipes 21 are arranged at equal intervals of 50cm, and there is a second spray pipe 24 between each two adjacent first spray pipes 21, that is, the staggered arrangement is as follows: first spray pipe 21, second spray pipe 24, first spray pipe 21, second spray pipe 24, first spray pipe 21... The water inlet pipe of the reflux pump 23 is connected to the dynamic spray desulfurization zone 2 located between the gravity plate 4 and the air inlet pipe 11, and the water outlet pipe of the reflux pump 23 is connected to multiple second spray pipes 24. The demister, manure fermentation equipment, dehydration equipment, annular liquid pump 42, and reflux pump 23 are all commercially available equipment.

[0026] The working principle of the above-mentioned series biogas purification and desulfurization equipment is as follows: the biogas generated by the manure fermentation equipment enters the dynamic spray desulfurization zone 2 in the desulfurization and recovery equipment 1 through the air inlet pipe 11. The first spray pipe 21 sprays the biogas to remove sulfur. The spray waste liquid that has absorbed sulfur accumulates on the gravity plate 4. The accumulated spray waste liquid can pre-absorb the biogas entering the desulfurization and recovery equipment 1. During the accumulation process, part of the spray waste liquid can be returned to the second spray pipe 24 through the return pump 23 to spray the biogas in conjunction with the first spray pipe 23. The contact reaction efficiency between the spray liquid and the biogas is increased by the porous tray 22, thereby realizing dynamic spray desulfurization in the dynamic spray desulfurization zone 2. After desulfurization, the biogas enters the gas storage tank through the gas outlet pipe 12 after being demisted by the demister. When the weight of the accumulated spray waste liquid exceeds the supporting force of gravity plate 4 and annular liquid pump 42, gravity plate 4 moves downward, exposing the outlet hole 41 and guiding the spray waste liquid into the static sedimentation sulfur-gathering zone 3. After the introduction is completed, gravity plate 4 returns to its original position and moves upward under the rebound restoring force of annular liquid pump 42. Then, the spray waste liquid entering the static sedimentation sulfur-gathering zone 3 undergoes an oxidation reaction through aeration tube 31 to obtain elemental sulfur. The elemental sulfur in the static sedimentation sulfur-gathering zone 3 and the reaction liquid after oxidation reaction are recovered together through recovery pipe 13. Thus, gravity plate 4 separates the dynamic spray desulfurization zone 2 and the static sedimentation sulfur-gathering zone 3, and the two do not interfere with each other.

[0027] Example 2: This example differs from Example 1 in that the perforated tray 22 in Example 1 is a single-layer design, and the perforated tray 22 in Example 1 is fixedly installed as a whole; from Figure 4 As can be seen, based on Embodiment 1, this embodiment further improves the number of layers and the setting state of the porous tray 22, as shown below: The porous tray 22 has two layers, and one layer of the porous tray 22 is rotatably and sealed to the inner wall of the desulfurization and recovery equipment 1. The air inlet pipe 11 is equipped with an adjustment component that adjusts the size of the holes where the two porous trays 22 meet according to the amount of biogas. from Figure 5 , Figure 6 and Figure 7 As can be seen, the adjustment assembly includes an orifice plate 111, a limiting plate 112, a first airbag rod 113 connecting the orifice plate 111 and the limiting plate 112, a connecting rod 221 disposed on a rotatable porous tray 22 and passing through a through groove in the side wall of the desulfurization and recovery equipment 1, and a second airbag rod 222 disposed on the through groove. The second airbag rod 222 is connected to the first airbag rod 113 through an air pipe embedded in the side wall of the desulfurization and recovery equipment 1, and the second airbag rod 222 is hinged to the connecting rod 221 through a hinge rod.

[0028] The working principle of this embodiment differs from that of Embodiment 1 in that when the biogas volume increases, the perforated plate 111 is pushed by the airflow, causing the perforated plate 111 to move closer to the limiting plate 112. The perforated plate 111 then continuously squeezes the first airbag rod 113, causing the second airbag rod 222 to extend and drive the docking rod 221 to rotate, which in turn drives the rotatable porous tray 22 to rotate. This causes the holes of the upper and lower porous trays 22 to gradually overlap from being misaligned, thereby increasing the size of the holes in the porous trays 22 and improving the contact reaction efficiency between the spray liquid and biogas. When the biogas volume decreases, the airflow driving force is less than the elastic restoring force of the first airbag rod 113. As a result, the perforated plate 111 resets under the elastic action of the first airbag rod 113, and the first airbag rod 113 resumes its extension. Consequently, the porous tray 22 is rotated in the opposite direction under the contraction force of the second airbag rod 222, causing the holes of the two porous trays 22 to gradually misalign and the size of the overlapping holes to gradually decrease in order to adapt to the current biogas volume processing.

[0029] Example 3: This example differs from Example 2 in that the spray volume of the first spray pipe 21 in Example 2 remains constant. Therefore, based on Example 2, this example further adjusts the spray volume of the first spray pipe 21 in relation to the air intake volume in the air intake pipe 11, as shown below: The first spray pipe 21 is equipped with a regulating valve to control the spray volume of the first spray pipe 21. The air inlet pipe 11 is equipped with a sensor to sense the air intake volume. The sensor and the regulating valve are electrically connected through a PLC system. The desulfurization recovery equipment 1 is connected to a generator that generates electricity using desulfurized biogas. The generator is electrically connected to the sensor through a PLC system. The sensor is a commercially available air intake flow sensor. The regulating valve, PLC system, and generator are all commercially available equipment. The bottom of the static sedimentation sulfur-collecting zone 3 is inverted conical (not shown in the figure).

[0030] The working principle of this embodiment differs from that of Embodiment 2 in that, when the amount of biogas changes, the sensor drives the regulating valve through the PLC system to adjust the spray volume of the first spray pipe 21 to match the current amount of biogas. That is, when the amount of biogas is small, the PLC system will adjust the first spray pipe 21 to automatically reduce the spray volume, directly saving the power consumption of the spray pump and the consumption of spray liquid; when the amount of biogas is large, the PLC system will adjust the first spray pipe 21 to automatically increase the spray volume, thereby effectively desulfurizing the biogas. Compared with biogas desulfurization under continuous large spray volume, it can reduce the waste of spray liquid while ensuring effective desulfurization of biogas; and it can generate electricity using the desulfurized biogas, thereby realizing the resource treatment of biogas and reducing the overall operating power cost of the equipment. The inverted cone design at the bottom of the static sedimentation sulfur-collecting zone 3 is conducive to the sedimentation and collection of elemental sulfur after its generation.

Claims

1. A series biogas purification and desulfurization treatment device, characterized in that, Including desulfurization and recovery equipment (1); The desulfurization and recovery equipment (1) is divided into a dynamic spray desulfurization zone (2) and a static sedimentation sulfur collection zone (3) by gravity plates (4). The dynamic spray desulfurization zone (2) is provided with a first spray pipe (21) and a porous tray (22) from top to bottom; the static sedimentation desulfurization zone (3) is provided with an aeration cylinder (31). The desulfurization recovery equipment (1) is provided with an air inlet pipe (11) connected to the dynamic spray desulfurization zone (2) located below the porous tray (22) and an air outlet pipe (12) connected to the dynamic spray desulfurization zone (2) located above the spray tray (21). The gravity plate (4) is provided with a drainage component for discharging spray waste liquid from the dynamic spray desulfurization zone (2) to the static sedimentation sulfur-receiving zone (3); the inner wall of the desulfurization recovery equipment (1) is provided with a longitudinal chute, and the bottom of the gravity plate (4) is slidably sealed to the longitudinal chute through an annular liquid pump (42). The annular liquid pump (42) is externally connected to a pressure relief device. The drainage component includes a liquid outlet (41) provided on the gravity plate (4), a baffle (43) provided on the top of the gravity plate (4) for blocking the liquid outlet (41) when the gravity plate (4) is at its highest point, and a shaft (44) for connecting the baffle (43) and the side wall of the desulfurization recovery equipment (1). The baffle (43) is hemispherical.

2. The series biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The desulfurization recovery equipment (1) is equipped with a reflux pump (23). The desulfurization recovery equipment (1) is equipped with multiple second spray pipes (24) arranged alternately with the first spray pipe (21). The water inlet pipe of the reflux pump (23) is connected to the dynamic spray desulfurization zone (2) located between the gravity plate (4) and the air inlet pipe (11). The water outlet pipe of the reflux pump (23) is connected to multiple second spray pipes (24).

3. The series-connected biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The porous tray (22) has two layers, and one layer of the porous tray (22) is rotatably sealed to the inner wall of the desulfurization and recovery equipment (1). The air inlet pipe (11) is equipped with an adjustment component that adjusts the size of the holes connecting the two porous trays (22) according to the amount of biogas. The adjustment assembly includes an orifice plate (111) and a limiting plate (112) disposed in the air inlet pipe (11), a first airbag rod (113) connecting the orifice plate (111) and the limiting plate (112), a connecting rod (221) disposed on a rotatable porous tray (22) and passing through the through groove of the side wall of the desulfurization recovery equipment (1), and a second airbag rod (222) disposed on the through groove. The second airbag rod (222) is connected to the first airbag rod (113), and the second airbag rod (222) is hinged to the connecting rod (221).

4. The series biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The first spray pipe (21) is provided with a regulating valve to control the spray volume of the first spray pipe (21), and the air inlet pipe (11) is provided with a sensor to sense the air volume. The sensor and the regulating valve are electrically connected through a PLC system.

5. The series biogas purification and desulfurization treatment equipment as described in claim 4, characterized in that, The desulfurization recovery equipment (1) is connected to a generator that generates electricity using desulfurized biogas, and the generator and the sensor are electrically connected through a PLC system.

6. The series-connected biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The air inlet pipe (11) is connected to the air outlet of the manure fermentation equipment, the air outlet pipe (12) is connected to the air inlet of the gas storage tank, and the side wall of the static sedimentation sulfur-gathering zone (3) is provided with a recovery pipe (13) connected to the dehydration equipment.

7. The series-connected biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The bottom of the statically settled sulfur zone (3) is conical.

8. The series biogas purification and desulfurization treatment equipment as described in claim 1, characterized in that, The desulfurization recovery equipment (1) located above the first spray pipe (21) is equipped with a demister.

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