Biogas desulfurization device

Abstract

The utility model provides a biogas desulfurization device which absorbs H2S in acid biogas through the oxidation-reduction property of an alkaline complex iron catalyst. H2S is directly oxidized by complexing iron to generate elemental sulfur, the complexing iron is converted into complexing ferrous iron, then air is blown into the regeneration settling tank, the complexing ferrous iron in the alkaline absorbent is oxidized by the air, the complexing ferrous iron in the absorbent is converted into the complexing iron for regeneration and reuse, and meanwhile, sulfur is subjected to settling separation in the regeneration settling tank to form sulfur slurry; the method has the characteristics that a complexing iron catalyst with high sulfur capacity is adopted, the method is not only suitable for treating feed gas with high sulfur content, but also small in circulating liquid amount and small in device size, elemental sulfur can be directly generated, and the problem of secondary pollution does not exist.

Description

TECHNICAL FIELD

[0001] The utility model relates to a biogas desulfurization technical field especially relates to a biogas desulfurization device. BACKGROUND

[0002] As a new energy, the application of biogas is more and more extensive. In the environmental protection standard of China, it is strictly stipulated that the content of H2S in biogas gas should not exceed 20mg / m3 when using biogas energy. H2S must be removed as much as possible in industrial or domestic gas.

[0003] When biogas is produced from anaerobic fermentation device, especially in medium or high temperature fermentation, a large amount of H2S is carried. Because there is a large amount of water vapor in biogas, water and H2S in biogas jointly act, which accelerates the corrosion and blockage of metal pipeline, valve and flowmeter. In addition, SO2 generated by the combustion of H2S combines with water vapor in the combustion product to form sulfurous acid, which causes corrosion of the metal surface of the equipment and also causes pollution to the atmospheric environment and affects human health. Therefore, before using biogas, H2S in it must be removed.

[0004] There is a wet desulfurization device in the prior art, for example, a complex iron wet desulfurization device for biogas disclosed in patent No. CN220450123U, which comprises a liquid exchange tank, a first flow divider, a second flow divider and a liquid return pipe, etc. The first flow divider is arranged at the upper middle part of the liquid exchange tank, a plurality of second flow dividers are connected to the upper side of the liquid exchange tank, the liquid return pipe is connected between each second flow divider and the liquid exchange tank, and each second flow divider is connected with the first flow divider. In the utility model, ammonia water and biogas react in the ammonia water reaction pipe, ammonia water absorbs hydrogen sulfide in biogas, and the ammonia water reaction pipe is arranged in a spiral shape, which can increase the reaction time of ammonia water and biogas and reduce the occupied space.

[0005] However, wet chemical desulfurization is only suitable for high hydrogen sulfide content and large gas flow, and its universality is not high, and it cannot reach the precision of dry desulfurization. CONTENT OF THE UTILITY MODEL

[0006] Therefore, it is necessary to provide a biogas desulfurization device to solve the problems in the background art.

[0007] To achieve the above purpose, the utility model provides a biogas desulfurization device, which comprises

[0008] The desulfurization tower is provided with a rich liquid outlet at the bottom, a gas outlet at the top, a sprayer at the upper part and an air inlet at the lower side wall.

[0009] The oxidation regeneration tower is provided with a dosing inlet, a rich liquid inlet connected with a rich liquid outlet at the top or upper sidewall, an oxidation inlet at the middle sidewall, a lean liquid outlet connected with the sprayer at the lower sidewall, and a sulfur slurry outlet at the bottom;

[0010] The filtration system is provided with a sulfur slurry inlet connected with the sulfur slurry outlet, and is used for separating the sulfur slurry into solid and liquid.

[0011] Further, the gas-water separator is provided with a separation inlet connected with the gas outlet.

[0012] Further, the dosing barrel is provided with a dosing outlet connected with the dosing inlet, and the dosing pump is arranged between the dosing inlet and the dosing outlet.

[0013] Further, the filtration system is provided with a liquid outlet, and the oxidation regeneration tower is provided with a liquid inlet, and the liquid outlet is connected with the liquid inlet.

[0014] Further,

[0015] The lean liquid outlet and the sprayer are provided with a lean liquid pump; and / or

[0016] The rich liquid outlet and the rich liquid inlet are provided with a rich liquid pump; and / or

[0017] The sulfur slurry outlet and the sulfur slurry inlet are provided with a sulfur slurry pump.

[0018] Further,

[0019] The front end of the gas inlet is provided with a booster fan; and / or

[0020] The front end of the oxidation inlet is provided with an oxidation fan.

[0021] Further, the sprayer has a plurality of sprayers.

[0022] Further, the bottom of the oxidation regeneration tower is a cone with a pointed end downward.

[0023] Different from the prior art, the technical scheme absorbs H2S in the acid biogas through the redox property of the basic complex iron catalyst. The H2S is directly oxidized by the complex iron to generate elemental sulfur, and the complex iron is converted into complex ferrous iron. Then, air is blown into the regeneration settling tank to oxidize the complex ferrous iron in the basic absorbent by air, so that the complex ferrous iron in the absorbent is converted into complex iron for recycling. Meanwhile, sulfur is settled and separated in the regeneration settling tank to form sulfur slurry, and the sulfur slurry is sent to a sulfur recovery system. The method has the characteristics of using a high-sulfur-capacity complex iron catalyst, which is not only suitable for treating raw gas with high sulfur content, but also has small circulating liquid volume and small device size, and can directly generate elemental sulfur without secondary pollution. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structural schematic diagram of a biogas desulfurization device according to the embodiment;

[0025] Figure 2 A structural schematic diagram of a biogas desulfurization device provided with a gas-water separator according to another embodiment;

[0026] Figure 3 A structural schematic diagram of a biogas desulfurization device provided with a dosing barrel and a dosing pump according to another embodiment;

[0027] Figure 4 A structural schematic diagram of a biogas desulfurization device provided with a rich liquid pump, a lean liquid pump, and a sulfur slurry pump according to another embodiment;

[0028] Figure 5 A structural schematic diagram of a biogas desulfurization device provided with a booster fan and an oxidation fan according to another embodiment.

[0029] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0030] 10, desulfurization tower; 11, sprayer; 12, oxidation regeneration tower; 13, filtration system; 14, gas-water separator; 15, dosing barrel; 21, dosing pump; 22, rich liquid pump; 23, lean liquid pump; 24, sulfur slurry pump; 25, booster fan; 26, oxidation fan. DETAILED DESCRIPTION

[0031] To describe the technical content, structural features, purposes and effects of the technical scheme in detail, the following will be described in detail in combination with specific embodiments and the accompanying drawings.

[0032] The term "embodiment" is mentioned in this document means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0033] Unless otherwise defined, the meaning of technical terms used in this document is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms in this document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0034] In the description of the present application, the phrase "and / or" is used to describe the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this document generally represents the logical relationship of "or" between the associated objects before and after.

[0035] In this application, such as "first" and "second", the terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0036] In this application, without more limitation, the "includes", "contains", "has" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent in such process, method or product.

[0037] As the same understanding as in the "Guidelines for Examination", in this application, "greater than", "less than", "exceed" and other expressions are understood as not including the number; "above", "below", "within" and other expressions are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0038] In the description of the embodiments of the present application, the spatial relative expressions such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship shown in the specific embodiments or the drawings, and are only used to facilitate the description of the specific embodiments of the present application or to facilitate the understanding of the reader, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be understood broadly. For example, the "connection" can be fixed connection, or detachable connection, or integral setting; it can be mechanical connection, or electrical connection, or communication connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] Please refer to Figures 1 to 5 The present embodiment provides a biogas desulfurization device, comprising

[0041] The desulfurization tower 10 is provided with a rich liquid outlet at the bottom, an air outlet at the top, a sprayer 11 at the upper part, and an air inlet at the lower side wall. The desulfurization tower 10 is the core part of the biogas desulfurization device, and its design includes the rich liquid outlet at the bottom for discharging the treated sulfur-lean liquid; the air outlet at the top for discharging the purified biogas; the sprayer 11 at the upper part for uniformly spraying the sulfur-lean liquid into the tower to increase the gas-liquid contact area; and the air inlet at the lower side wall through which the biogas enters the tower. The sulfur-lean liquid containing complex iron is uniformly sprayed by the sprayer 11 inside the desulfurization tower 10, and is in countercurrent contact with the biogas containing hydrogen sulfide, so as to realize the chemical adsorption and oxidation reaction of hydrogen sulfide, and generate sulfide.

[0042] The desulfurization tower 10 needs to be able to withstand the chemical corrosion of sulfur-lean liquid and high operating pressure. Therefore, the tower body is usually made of corrosion-resistant materials such as stainless steel, glass steel or high-density polyethylene to ensure the durability and safety of the equipment. The sprayer 11 and the piping system can also use the same corrosion-resistant materials to prevent leakage or damage due to chemical corrosion. The desulfurization tower 10 can also be provided with fillers or sieve plates, the material selection of which also considers corrosion resistance. Commonly used materials include polypropylene, polyvinyl chloride or ceramics, which not only resist corrosion but also provide good gas-liquid distribution performance.

[0043] The sprayer 11 is located at the upper part of the desulfurization tower 10, and its main function is to uniformly spray the sulfur-lean liquid containing complex iron catalyst into the desulfurization tower 10. The sprayer 11 is usually composed of multiple nozzles, which are responsible for dispersing the sulfur-lean liquid into fine droplets to increase the gas-liquid contact area and improve the desulfurization efficiency. The structural design of the sprayer 11 ensures that the sulfur-lean liquid can cover the entire tower cross section, so that the biogas containing hydrogen sulfide can fully contact the sulfur-lean liquid and effectively react. The function of the sprayer 11 is to promote the mass transfer process between the biogas containing hydrogen sulfide and the sulfur-lean liquid. In the desulfurization tower 10, the biogas enters from the gas inlet on the lower side wall and contacts the sulfur-lean liquid flowing downward. The sprayer 11 atomizes the sulfur-lean liquid, increasing the opportunity for gas-liquid contact, so that hydrogen sulfide can be more effectively oxidized by the complex iron catalyst to convert into elemental sulfur. This process not only improves the desulfurization efficiency, but also helps to reduce the circulation amount of sulfur-lean liquid and operating costs.

[0044] Further, the sprayer 11 has multiple. Multiple sprayers 11 can be arranged in multiple layers, with multiple layers of spraying arranged at different heights in the desulfurization tower 10, which can ensure that the sulfur-lean liquid uniformly covers the entire filler layer, increases the gas-liquid contact area, and improves the desulfurization efficiency. Spiral pipe arrangement can also be used to help the sulfur-lean liquid to be more evenly distributed and improve the desulfurization efficiency.

[0045] The top or upper sidewall of the oxidation regeneration tower 12 is respectively provided with a dosing inlet, a rich liquid inlet connected with a rich liquid outlet, preferably, a rich liquid pump 22 is arranged between the rich liquid outlet and the rich liquid inlet; the rich liquid pump 22 can be a centrifugal pump, a plunger pump or a diaphragm pump, so as to improve the conveying efficiency; the middle sidewall is provided with an oxidation inlet; the lower sidewall is provided with a lean liquid outlet connected with the sprayer 11; preferably, a lean liquid pump 23 is arranged between the lean liquid outlet and the sprayer 11; the lean liquid pump 23 can be a centrifugal pump, a plunger pump or a diaphragm pump, so as to improve the conveying efficiency; and the bottom is provided with a sulfur slurry outlet. The dosing inlet of the top or upper sidewall of the oxidation regeneration tower 12 is used for adding a catalyst, such as a basic complex iron catalyst or other necessary chemicals, into the tower; the rich liquid inlet connected with the rich liquid outlet of the desulfurization tower 10 is used for receiving a rich liquid containing sulfur, that is, a solution containing a large amount of sulfides; the oxidation inlet of the middle sidewall is used for introducing air or other oxidants to promote the oxidation of sulfides; the lean liquid outlet of the lower sidewall is connected with the sprayer 11 of the desulfurization tower 10, and is used for returning the regenerated sulfur-containing lean liquid, that is, a solution containing a small amount of sulfur and containing a basic complex iron catalyst, to the desulfurization tower 10 to continue to participate in the desulfurization reaction; and the sulfur slurry outlet at the bottom is used for discharging the sulfur slurry generated by the oxidation reaction. The main function of the oxidation regeneration tower 12 is to regenerate the complex iron catalyst and oxidize the sulfides. In the tower, the rich sulfur liquid introduced by the rich liquid inlet contains sulfides generated by the reaction with hydrogen sulfide, and the sulfides are oxidized under the action of air or other oxidants introduced by the oxidation inlet to generate elemental sulfur or sulfate, so as to realize the harmless treatment of the sulfides. At the same time, the complex iron ions in the complex iron catalyst are regenerated in the oxidation process, the desulfurization activity is restored, and the complex iron catalyst returns to the desulfurization tower 10 through the lean liquid outlet to continue to participate in the desulfurization reaction. This process not only improves the utilization rate of the complex iron catalyst, but also reduces the consumption of chemicals and the operation cost. The sulfur slurry outlet is used for discharging the sulfur slurry generated in the oxidation process out of the tower, and the sulfur slurry is subjected to solid-liquid separation in the filtration system 13 to recover the elemental sulfur or sulfate, so as to realize the recycling of resources. Through the oxidation regeneration tower 12, the hydrogen sulfide in the biogas can be effectively removed, the iron catalyst can be recycled, the sulfur resources can be recovered, and the economic benefit and environmental friendliness of the desulfurization process are improved.

[0046] Further, the bottom of the oxidation regeneration tower 12 is a cone with a tip pointing downward, so as to facilitate the aggregation of the sulfur slurry and the conveying of the sulfur slurry to the filtration system 13 through the sulfur slurry outlet.

[0047] The filtration system 13 is provided with a sulfur slurry inlet connected with the sulfur slurry outlet, and is used for subjecting the sulfur slurry to solid-liquid separation. Preferably, a sulfur slurry pump 24 is arranged between the sulfur slurry outlet and the sulfur slurry inlet; the sulfur slurry pump 24 can be a plunger pump or a diaphragm pump, so as to improve the conveying efficiency.

[0048] The filter system 13 can adopt various filtering methods in the prior art. The following is exemplified: the filter system 13 can adopt a plate-and-frame filter press, which is composed of alternating filter plates and filter frames, the surface of the filter plate is covered with filter cloth for capturing solid particles, and the filter frame is used to contain the sulfur slurry to be filtered. The sulfur slurry enters the plate-and-frame filter press from the sulfur slurry inlet, under the action of high pressure, the liquid is separated out through the filter cloth, and the solid sulfur is retained on the filter cloth, effectively separating the sulfur from the liquid, realizing the recovery of sulfur and the purification of the iron catalyst. The filter system 13 can also adopt a vacuum drum filter, which includes a rotating drum body, the surface of the drum body is covered with filter cloth, and a vacuum is formed inside the drum body to enhance the filtering effect. The sulfur slurry is introduced onto the surface of the drum body, the liquid is drawn away through the filter cloth under the action of vacuum, and the solid sulfur is retained on the filter cloth. The vacuum drum filter is suitable for continuous filtering operation and can realize high-efficiency solid-liquid separation, reducing operation time and cost. The filter system 13 can also adopt a belt filter press, which is composed of two parallel filter belts and a pressing roller. The filter belts move under the drive of the roller, and the sulfur slurry is pressed and filtered between the filter belts. The sulfur slurry is evenly laid on the filter belts, and as the filter belts move, the liquid is filtered out, and the solid sulfur is pressed into a cake. The belt filter press is suitable for processing large flow of sulfur slurry and can operate continuously, reducing manual intervention and improving automation. The filter system 13 functions to separate the sulfur slurry discharged from the bottom of the oxidation regeneration tower 12 into solid and liquid, recover the solid sulfur, and return the purified iron catalyst to the desulfurization tower 10 for recycling. This process not only improves the recovery rate of sulfur resources, reduces environmental pollution, but also reduces the consumption of iron catalyst, improves the economic benefit of the entire desulfurization device, and improves the environmental friendliness. By selecting appropriate filtering methods and structural compositions, the filter system 13 can meet the needs of biogas desulfurization devices of different scales and requirements.

[0049] Further, a gas-water separator 14 is also included, which is provided with a separation inlet connected with the gas outlet. The gas-water separator 14 mainly consists of the following parts: a main cylinder, which is the core of the separator, usually made of stainless steel or carbon steel and other pressure-resistant and corrosion-resistant materials to ensure stability and durability in high-pressure and corrosive environments; an inlet and outlet pipeline for connecting the gas outlet of the desulfurization tower 10 and the separator, and discharging the purified gas; a separation cylinder, which is the core component of the gas-water separator, usually made of stainless steel or aluminum alloy, with good corrosion resistance and strength; separation plates or guide plates, which are usually provided with guide plates or fiber devices in the separation chamber to increase the gas-liquid separation effect and prevent liquid from being carried out by gas; a drainage outlet and a drainage valve for draining the separated liquid, usually located at the bottom of the separator. The main function of the gas-water separator 14 is to remove the water in the biogas from the desulfurization tower 10 to prevent the water from causing equipment damage or efficiency reduction in the subsequent biogas utilization process. Specifically, by removing the water in the biogas, the gas quality entering the subsequent equipment (such as a biogas generator) is improved, avoiding equipment corrosion and efficiency reduction caused by water, preventing water from damaging downstream equipment, and protecting equipment from damage.

[0050] Further, a dosing bucket 15 and a dosing pump 21 are also included, the dosing bucket 15 is provided with a dosing outlet connected with the dosing inlet, and the dosing pump 21 is arranged between the dosing inlet and the dosing outlet.

[0051] The dosing bucket 15 is mainly responsible for the storage and supply of iron catalyst. It usually consists of the following parts: a solution tank, which is a storage container for iron catalyst to prevent its volatilization, leakage or contamination by the outside world, and to maintain the purity and stability of the iron catalyst; a stirrer for stirring and dissolving the iron catalyst to ensure uniform mixing of the iron catalyst for subsequent accurate dosing; a liquid level meter for monitoring the liquid level in the dosing bucket 15 to ensure sufficient supply of iron catalyst and prevent overflow; a metering pump (i.e. dosing pump 21) connected with the dosing bucket 15 for accurately dosing the iron catalyst into the oxidation regeneration tower 12; an electric control cabinet for controlling the operation of the dosing bucket 15 and the metering pump to realize automatic operation. The function of the dosing bucket 15 is to provide a stable and safe medicament storage environment and to ensure that the iron catalyst can be accurately metered and dosed into the desulfurization system to ensure the desulfurization efficiency and effect.

[0052] Further, the filter system 13 is also provided with a liquid outlet, and the oxidation regeneration tower 12 is also provided with a liquid inlet, and the liquid outlet is connected with the liquid inlet. The solution after solid-liquid separation by the filter system 13 contains a large amount of oxidized iron catalyst, which is equivalent to the sulfur-lean liquid in the oxidation regeneration tower 12. By returning this part of the solution to the oxidation regeneration tower 12, the consumption of iron catalyst can be reduced, and the economic benefit and environmental friendliness of the entire desulfurization device can be improved.

[0053] Preferably, the front end of the air inlet is provided with a booster fan 25; and / or the front end of the oxidation inlet is provided with an oxidation fan 26. The booster fan 25 and the oxidation fan 26 can adopt Roots blower, centrifugal fan, etc. Stable delivery of biogas or air ensures stable operation of the desulfurization process.

[0054] The working process of the new type is as follows: the biogas containing hydrogen sulfide from outside the boundary region is reversely contacted with the lean liquid pumped by the lean liquid pump 23 from the bottom to the top after being pressurized by the booster fan 25, and the biogas after separation of liquid drops is discharged from the top of the desulfurization tower 10 into the gas-water separator 14. The trivalent iron in the solution at the bottom of the desulfurization tower 10 absorbs the hydrogen sulfide in the biogas to become divalent iron, and the solution becomes sulfur-rich liquid which is pumped into the regeneration tank by the rich liquid pump 22 and is oxidized with the air blown in by the oxidation fan 26. The divalent iron in the rich liquid is oxidized to become trivalent iron lean liquid by the oxygen blown in by the regeneration fan, and at the same time, the elemental sulfur in the regeneration tank grows layer by layer in each compartment, and the sulfur particles deposit at the bottom of the conical body of the settling tank due to weight, and the lean liquid separated from the sulfur at the upper layer is delivered to the desulfurization tower 10 by the lean liquid pump 23 for desulfurization. When the sulfur content in the bottom sulfur slurry reaches a certain concentration, the sulfur slurry is pumped into the plate-and-frame filter press by the sulfur slurry pump 24 for solid-liquid separation, the liquid is recycled to the system, and the sulfur paste can be sold.

[0055] The new type absorbs H2S in the acidic biogas by the redox property of the basic complex iron catalyst. The H2S is directly oxidized to elemental sulfur by the complex iron, and the complex iron is converted into complex ferrous iron. Then, air is blown into the regeneration settling tank to oxidize the complex ferrous iron in the basic absorbent, so that the complex ferrous iron in the absorbent is converted into complex iron for recycling, and at the same time, the sulfur in the regeneration settling tank is settled and separated to form sulfur slurry which is sent to a sulfur recovery system. The method has the characteristics of using high-sulfur-content complex iron catalyst, which is not only suitable for high-sulfur-content raw gas treatment, but also has small circulation liquid volume and small device size, and can directly generate elemental sulfur without secondary pollution problem.

[0056] It should be noted that although the above embodiments have been described in the present text, the patent protection scope of the present utility model is not limited thereby. Therefore, based on the innovative concept of the present utility model, the changes and modifications made to the embodiments described in the present text, or the equivalent structure or equivalent process transformation made by using the contents of the present utility model specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the patent of the present utility model.

Claims

1. A biogas desulfurization device, characterized by, The device comprises a desulfurization tower, which is provided with a rich liquid outlet at the bottom, a gas outlet at the top, a sprayer at the upper part, and an air inlet at the lower side wall; an oxidation regeneration tower, which is provided with a dosing inlet at the top or upper side wall, a rich liquid inlet connected with the rich liquid outlet, an oxidation inlet at the middle side wall, a lean liquid outlet connected with the sprayer at the lower side wall, and a sulfur slurry outlet at the bottom; a filtering system, which is provided with a sulfur slurry inlet connected with the sulfur slurry outlet, and is used for solid-liquid separation of the sulfur slurry.

2. The biogas desulfurization device according to claim 1, characterized in that: The device further comprises an air-water separator, which is provided with a separation inlet connected with the gas outlet.

3. The biogas desulfurization device according to claim 2, characterized in that: The device further comprises a dosing barrel and a dosing pump, the dosing barrel is provided with a dosing outlet connected with the dosing inlet, and the dosing pump is arranged between the dosing inlet and the dosing outlet.

4. The biogas desulfurization device according to claim 3, characterized in that: The filtering system is further provided with a liquid outlet, and the oxidation regeneration tower is further provided with a liquid inlet, the liquid outlet is connected with the liquid inlet.

5. The device according to claim 4, characterized in that: a lean liquid pump is arranged between the lean liquid outlet and the sprayer; and / or a rich liquid pump is arranged between the rich liquid outlet and the rich liquid inlet; and / or a sulfur slurry pump is arranged between the sulfur slurry outlet and the sulfur slurry inlet.

6. The device according to claim 5, characterized in that: a booster fan is arranged at the front end of the air inlet; and / or an oxidation fan is arranged at the front end of the oxidation inlet.

7. The biogas desulfurization device according to claim 6, characterized in that: The sprayer has a plurality of sprayers.

8. The biogas desulphurization device according to claim 7, characterized in that: The bottom of the oxidation regeneration tower is a cone with a pointed end downward.

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