Biogas biological desulfurization device

Abstract

The present application is suitable for biogas treatment equipment technical field, provide a kind of biogas biological desulfurization device, including: tower body, top is equipped with circulating spray system, tower body middle section is equipped with filler layer;Sulfur removal system is set to the bottom of tower body, sulfur removal system includes: the aeration head being set to the bottom of tower body, the liquid inside the bottom of tower body is supplied with gas by aeration head, the inside of tower body is equipped with suction material mechanism that adsorbs floating scum on the top of liquid, and the floating object on the top of liquid is removed by suction material mechanism;Slidingly connected to the bottom of tower body's discharge tray, discharge tray is slid down after liquid is accumulated to a certain degree, whereby, the structure for automatically removing and dredging sulfur particles on the bottom is set in the present application, it is guaranteed that the accumulated sulfur particles can be automatically removed regularly, while the small sulfur particles in suspension are removed, the automatic cleaning and particle removal of desulfurization device are realized, and the maintenance cost in later period is reduced.

Description

Technical Field

[0001] This invention relates to the field of biogas treatment equipment technology, and in particular to a biogas biological desulfurization device. Background Technology

[0002] Biogas, as a green energy source, is receiving increasing attention due to current energy shortages. The biogas produced in this project primarily consists of methane and carbon dioxide, with small amounts of hydrogen sulfide and other gases. Hydrogen sulfide is a highly toxic and harmful gas that affects human health; even 0.1% hydrogen sulfide or organic sulfur in the air can be fatal within seconds. Furthermore, under humid and hot conditions, it is severely corrosive to metal pipes, storage tanks, and gas-using equipment. The SO2 produced during combustion is also a highly corrosive gas and can contribute to acid rain in the atmosphere, polluting the environment. Therefore, biogas must undergo desulfurization before comprehensive utilization.

[0003] Among existing methods for desulfurizing biogas, biological desulfurization is particularly common, and it is mainly divided into two categories: internal circulation and external circulation. In the internal circulation method (In-situ method), air (oxygen) is directly introduced into the storage tank or a dedicated biological desulfurization reactor, utilizing a microbial film present at the biogas-liquid interface for desulfurization. A precisely metered small amount of air (or oxygen) is injected into the top space of the biogas storage tank. H2S from the biogas, the injected O2, and circulating water (providing humidity and nutrients) mix within the tank. Sulfur bacteria attached to the biofilm on the inner wall of the tank oxidize the H2S. The resulting sulfur particles precipitate to the bottom of the tank and are periodically discharged; the purified biogas is output from the top. When using this method for desulfurization, since sulfur particles are continuously generated, during the desulfurization process, on the one hand, larger sulfur particles will settle at the bottom of the device, requiring a sludge removal process, which is quite labor-intensive; on the other hand, smaller particles will be suspended inside the liquid, making it difficult to separate the liquid from the sulfur particles and affecting the recycling of the liquid.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a biogas biological desulfurization device that can automatically remove and dredge sulfur particles at the bottom by setting up a structure that ensures the regular automatic removal of accumulated sulfur particles and suspended small sulfur particles, thereby achieving automatic cleaning and particle removal of the desulfurization device and reducing subsequent maintenance costs.

[0006] To achieve the above objectives, the present invention provides a biogas biological desulfurization device, comprising: a tower body, wherein a circulating spray system is provided at the top of the tower body, and a packing layer is provided in the middle section of the tower body;

[0007] A desulfurization system is installed at the bottom of the tower body, the desulfurization system comprising:

[0008] An aeration head is installed at the bottom of the tower body. The aeration head supplies gas to the liquid inside the bottom of the tower body, thereby aerating the small sulfur particles inside the liquid to the edge of the liquid surface. The tower body is equipped with a suction mechanism to adsorb the foam floating on the top of the liquid. The suction mechanism adsorbs and removes the floating matter on the top of the liquid.

[0009] A discharge tray is slidably connected to the bottom of the tower body. After the liquid on the top of the discharge tray accumulates to a certain extent, it slides downward and discharges the large sulfur particles accumulated on the top of the discharge tray to the bottom of the discharge tray and out of the tower body through the discharge port.

[0010] In one embodiment, a connecting pipe is provided between the aeration head and the bottom surface of the tower body. The connecting pipe extends from the bottom of the tower body to the outside of the tower body through an air supply pipe, and the air supply pipe is connected to an air supply mechanism.

[0011] In one embodiment, the suction mechanism includes:

[0012] A suction pipe fixed to the tower body, wherein one end of the suction pipe is located inside the tower body and points vertically downwards, directly opposite the edge of the liquid;

[0013] A suction head is slidably connected to one end of the suction pipe located inside the tower body. The suction head is suspended above the liquid. The side wall of the suction head is provided with a suction port. Suspended impurities at the top of the liquid are discharged from the tower body through the suction port.

[0014] In one embodiment, a thrust spring is provided between the discharge tray and the bottom of the tower body, and there is an adsorption force between the top of the discharge tray and the aeration head. When the liquid at the top of the discharge tray reaches a predetermined weight, the discharge tray slides downward under the force of gravity, overcoming the adsorption force and the elastic force of the thrust spring.

[0015] In one embodiment, the discharge tray includes:

[0016] The intermediate body has a disc-shaped structure, and several closely arranged material support plates are rotatably provided on the outer edge of the intermediate body. The top of the intermediate body is provided with a guide bevel, so as to guide large sulfur particles to the top of the material support plates.

[0017] The intermediate body is provided with a sliding sleeve that is rotatably connected to the outside of the connecting pipe. A guide vane is provided between the sliding sleeve and the intermediate body. Under the action of liquid flow, the guide vane pushes the discharge plate to rotate so that the material receiving plate flips 180°.

[0018] In one embodiment, the outer edge of the intermediate body is provided with an installation ring, the material support plate is rotatably connected between the installation ring and the intermediate body, the two sides of the material support plate are provided with rotating shafts, the rotating shafts that cooperate with the installation ring are provided with driven gears, the inside of the tower body is provided with fixed teeth corresponding to the driven gears, and the fixed teeth drive the driven gears to rotate 180°.

[0019] In one embodiment, the outer wall of the mounting ring is provided with a sliding shaft, the interior of the tower body is provided with an annular groove and a straight groove that is perpendicularly connected to the annular groove, when the sliding shaft is engaged with the annular groove, the discharge plate rotates inside the annular groove, and the fixing teeth are provided at the bottom of the annular groove.

[0020] In one embodiment, the outer ring of the connecting pipe is provided with a sealing ring sleeve, the bottom of the sliding sleeve is inserted into the inside of the sealing ring sleeve, the thrust spring is disposed inside the sealing ring sleeve, and a thrust bearing is provided between the thrust spring and the sliding sleeve.

[0021] In one embodiment, the bottom edge of the intermediate body is provided with a mating ring sleeve, the bottom of the tower body is provided with a separating ring sleeve that fits and seals against the inner wall of the mating ring sleeve, the separating ring sleeve is provided with a connecting hole, the tower body is provided with a liquid outlet inside the separating ring sleeve, the mating ring sleeve blocks the connecting hole when the discharge plate slides down to a predetermined position, and the material receiving plate is provided with a plurality of sieve holes.

[0022] In one embodiment, the tower body is provided with a large particle discharge pipe that communicates with the outside of the separating ring.

[0023] This invention provides a biogas biological desulfurization device, comprising: a tower body, the top of which is provided with a circulating spray system, and a packing layer in the middle section of the tower body to ensure normal biological reaction and biogas desulfurization process inside the tower body;

[0024] A desulfurization system located at the bottom of the tower separates sulfur particles from the liquid at the bottom of the tower, ensuring effective separation of the liquid and sulfur particles. The desulfurization system includes:

[0025] An aeration head is installed at the bottom of the tower body. The aeration head supplies gas to the liquid at the bottom of the tower body, thereby aerating the small sulfur particles inside the liquid to the edge of the liquid surface. By setting the aeration head, the technical effect of removing small sulfur particles inside the liquid through aeration is achieved, thereby ensuring that the content of small sulfur particles inside the liquid is within a low and reasonable range, and achieving rapid removal of small sulfur particles inside the liquid. The tower body is equipped with a suction mechanism to adsorb and remove the floating matter on the top of the liquid. Under the action of the aeration head, small sulfur particles form floating matter and foam on the top of the liquid, so that the floating matter and foam can be removed simultaneously by the suction mechanism.

[0026] A discharge tray slidably connected to the bottom of the tower body is used to collect the liquid and large sulfur particles within it, ensuring smooth subsequent processing. During operation, when the liquid accumulates to a certain level on the top of the discharge tray, it slides downwards, discharging the large sulfur particles accumulated on top of the tray to the bottom and then out of the tower body through the discharge port. This achieves periodic discharge of large sulfur particles without manual removal, optimizing the sulfur particle separation process. In summary, the technical advantage of this invention is that by setting up an automatic structure for removing and clearing sulfur particles from the bottom, it ensures the periodic automatic removal of accumulated sulfur particles and suspended small sulfur particles, achieving automatic cleaning and particle removal of the desulfurization device and reducing subsequent maintenance costs. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0028] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0029] Figure 3 yes Figure 2 Enlarged structural diagram of section A;

[0030] Figure 4 yes Figure 2 Enlarged structural diagram of section B;

[0031] Figure 5 This is a schematic diagram of the internal structure of the tower body of the present invention;

[0032] Figure 6 This is a three-dimensional structural diagram of the discharge tray of the present invention;

[0033] Figure 7 This is a three-dimensional structural diagram of the material support plate of the present invention;

[0034] In the diagram, 1-feed inlet, 2-tower body, 21-straight groove, 22-ring groove, 23-fixed tooth, 24-connecting hole, 25-separating ring sleeve, 3-large particle discharge pipe, 4-liquid discharge pipe, 5-air supply pipe, 6-base, 7-suction pipe, 8-packing layer, 9-suction head, 10-aeration head, 11-discharge plate, 111-sliding shaft, 112-mounting ring, 113-mounting hole, 114-intermediate body, 115-guide vane, 12-thrust spring, 13-sealing ring sleeve, 14-material support plate, 141-sieve hole, 142-rotating shaft, 143-driven gear. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] See Figure 1 , Figure 2 and Figure 3 The present invention provides a biogas biological desulfurization device, which includes a tower body 2, with a feed inlet 1 and a circulating spray system at the top. The bottom of the tower body 2 is installed in a predetermined position via a base 6. A packing layer 8 is provided in the middle section of the tower body 2 to ensure normal biological reaction inside the tower body 2 and the desulfurization process of biogas.

[0039] The desulfurization system, located at the bottom of tower 2, separates sulfur particles from the liquid at the bottom of tower 2, ensuring effective separation of the liquid and sulfur particles. The desulfurization system includes:

[0040] The aeration head 10, located at the bottom of the tower body 2, supplies gas to the liquid at the bottom of the tower body 2, thereby aerating the small sulfur particles inside the liquid to the edge of the liquid surface to form floating foam. By setting the aeration head 10, the technical effect of removing small sulfur particles from the liquid through aeration is achieved, thus ensuring that the content of small sulfur particles in the liquid is within a low and reasonable range, and achieving rapid removal of small sulfur particles from the liquid. The tower body 2 is equipped with a suction mechanism to adsorb the foam floating on the top of the liquid. At this time, the foam will adhere to the floating matter of small sulfur particles, so the small sulfur particles can be removed at the same time as the foam. The suction mechanism adsorbs and removes the floating matter on the top of the liquid. Under the action of the aeration head 10, the small sulfur particles form floating matter on the top of the liquid, which can be removed by the suction mechanism.

[0041] The discharge plate 11, which is slidably connected to the bottom of the tower body 2, is used to receive the liquid and large sulfur particles inside the liquid, ensuring the subsequent processing. In use, when the liquid accumulates to a certain level, the discharge plate 11 slides downward and discharges the large sulfur particles accumulated on the top of the discharge plate 11 to the bottom of the discharge plate 11 and out of the tower body 2 through the discharge port. The large particle discharge pipe 3 is connected to the discharge port, thereby realizing the periodic discharge of large sulfur particles without the need for manual removal, thus optimizing the separation process of sulfur particles.

[0042] In one embodiment, in order to ensure the aeration and impurity removal effect of the liquid inside the tower body 2, a connecting pipe is provided between the aeration head 10 and the bottom surface of the tower body 2. The connecting pipe extends from the bottom of the tower body 2 to the outside of the tower body 2 through the air supply pipe 5, thereby ensuring that the air supply pipe 5 can be connected to the air supply mechanism. The setting of the air supply mechanism is a conventional setting for those skilled in the art, and various devices with compressed or high-pressure air supply functions can be used, which will not be described in detail. By setting the air supply mechanism, it is convenient to supply gas to the inside of the aeration head 10, thereby effectively ensuring the aeration and removal effect of sulfur particles inside the liquid.

[0043] Specifically, to ensure that the suction mechanism adsorbs and removes floating matter from the top of the liquid, the suction mechanism includes:

[0044] The suction pipe 7 is fixed on the tower body 2. One end of the suction pipe 7 is located inside the tower body 2, vertically downward and facing the edge of the liquid, to ensure that the floating objects floating on the edge of the liquid can be properly adsorbed and the impurities can be properly removed.

[0045] The suction head 9 is slidably connected to one end of the suction pipe 7 located inside the tower body 2. The suction head 9 can be made of various materials that can float on the water surface, ensuring that the suction head 9 can float on the top of the liquid, thereby ensuring the adsorption effect on floating objects. The suction head 9 is suspended on the top surface of the liquid. The side wall of the suction head 9 is provided with a suction port. The suspended impurities on the top of the liquid are discharged from the tower body 2 through the suction port. The suction pipe 7 can be connected to an external negative pressure adsorption mechanism. The negative pressure adsorption mechanism is existing technology and will not be described in detail.

[0046] In one embodiment of the present invention, in order to ensure the normal use of the discharge plate 11, a thrust spring 12 is provided between the discharge plate 11 and the bottom of the tower body 2. There is an adsorption force between the top of the discharge plate 11 and the aeration head 10. When the liquid at the top of the discharge plate 11 reaches a predetermined weight, the discharge plate 11 is overcoming the adsorption force and the elastic force of the thrust spring 12 by gravity and slides down quickly, ensuring that the large sulfur particles at the top of the discharge plate 11 can be discharged from the top of the discharge plate 11 and the tower body 2 normally, thus achieving a normal particle removal effect.

[0047] Specifically, in combination Figure 4 and Figure 6 The discharge tray 11 includes:

[0048] The intermediate body 114 has a disc-shaped structure. Several closely arranged material support plates 14 are rotatably provided on the outer edge of the intermediate body 114. The top of the intermediate body 114 is provided with a guide slope, so as to guide the large sulfur particles to the top of the material support plates 14 and prevent the large sulfur particles from accumulating on the intermediate body 114, which would prevent the large sulfur particles from being discharged from the top of the discharge plate 11.

[0049] The intermediate body 114 is provided with a sliding sleeve rotatably connected to the outside of the connecting pipe. A guide vane 115 is provided between the sliding sleeve and the intermediate body 114. Under the action of liquid flow, the guide vane 115 pushes the discharge plate 11 to rotate so that the support plate 14 is rotated 180°. When the discharge plate 11 slides down to the predetermined position, the liquid at the top of the discharge plate 11 will flow through the guide vane 115, thereby pushing the intermediate body 114 to rotate on the connecting pipe, which facilitates the subsequent discharge of large sulfur particles from the top of the support plate 14 from the tower body 2.

[0050] Furthermore, in combination Figures 5-7To enable the discharge plate 11 to rotate the support plate 14, thereby rotating the large sulfur particles at the top of the support plate 14 to the bottom, an installation ring 112 is provided on the outer edge of the intermediate body 114. Installation holes 113 are provided on the installation ring 112 and the intermediate body 114 to ensure the rotational installation effect of the support plate and to ensure that the driven gear 143 inside the installation hole 113 can connect with the driving gear. The support plate 14 is rotatably connected between the installation ring 112 and the intermediate body 114, ensuring the normal installation of the support plate 14. Simultaneously, to maintain the shape of the support plate 14 itself... The force of the load-bearing plate can be controlled by adjusting the installation gap of the rotating shaft 142 or by installing a torsion bearing on the outside of the rotating shaft 142. This ensures the holding force and load-bearing capacity of the load-bearing plate 14 and controls the rotational force of the load-bearing plate 14, thus ensuring that the load-bearing plate 14 can maintain its original state and receive large sulfur particles when not controlled. The load-bearing plate 14 has rotating shafts 142 on both sides. The rotating shafts 142 that cooperate with the mounting ring 112 are equipped with driven gears 143. The tower body 2 has fixed teeth 23 inside that correspond to the driven gears 143. The fixed teeth 23 drive the driven gears 143. Rotating 180°, the length of the fixed tooth 23 is precisely set to control the driven gear 143 to rotate 180°, ensuring that the large sulfur particles on the top of the support plate 14 directly flip into the bottom of the discharge plate 11, completing the discharge effect. The outer wall of the mounting ring 112 is provided with a sliding shaft 111, and the inside of the tower body 2 is provided with an annular groove 22 and a straight groove 21 that is perpendicularly connected to the annular groove 22. When the sliding shaft 111 is engaged with the annular groove 22, the discharge plate 11 rotates inside the annular groove 22. At this time, the flow of liquid drives the discharge plate 11 to rotate inside the annular groove 22, further realizing the support plate rotation. The material plate 14 is controlled by a fixed tooth 23 located at the bottom of the annular groove 22. This ensures that when the discharge plate 11 rotates, the driven gear 143 can rotate to a position where it meshes with the fixed tooth 23, thus controlling the material plate 14. At the same time, when the sliding shaft 111 rotates to the position of the straight groove 21, all the receiving plates rotate 180°. Under the action of the thrust spring 12, the discharge plate 11 slides upward and is pushed into the interior of the straight groove 21, restricting the rotation of the discharge plate 11. Simultaneously, the position of the guide vane 115 is blocked by the aeration head 10.

[0051] In one embodiment, to ensure the pushing and resetting of the receiving plate, a sealing ring sleeve 13 is provided around the outer ring of the connecting pipe. The bottom of the sliding sleeve is inserted into the inside of the sealing ring sleeve 13 to protect the internal thrust spring 12 and thrust bearing, preventing liquid from entering the interior of the sealing ring sleeve 13 and affecting the internal structure. The thrust spring 12 is located inside the sealing ring sleeve 13, and a thrust bearing is provided between the thrust spring 12 and the sliding sleeve to ensure the normal rotation of the discharge plate 11 and prevent wear on the thrust spring 12.

[0052] Further, see Figure 5 , Figure 6 and Figure 7 To ensure partitioning at the bottom of tower body 2, a mating ring is provided at the bottom edge of the intermediate body 114. A separating ring 25, which seals against the inner wall of the mating ring, is provided at the bottom of tower body 2. The mating ring and the separating ring 25 work together to partition the bottom area of ​​the discharge plate 11. Through separation in different areas, normal separation of particles and liquid is achieved. A connecting hole 24 is provided on the separating ring 25. When the discharge plate 11 is not sliding downwards, the connecting hole 24 connects the inner and outer sides of the separating ring 25. At this time, the liquid enters the outer side of the separating ring 25 through the sieve holes 141 on the receiving plate, and further enters the interior of the separating ring 25. The liquid is discharged from the bottom outlet. The tower body 2 is located inside the partition ring 25 and has an outlet. The outlet discharges the liquid inside the partition ring 25 into the tower body 2. The outlet is connected to the outlet pipe 4 and extends to the outside of the tower body 2 to ensure normal discharge of the liquid. At this time, the large particle discharge pipe 3 is in a blocked state. When the ring slides down the discharge plate 11 to the predetermined position, it blocks the connecting hole 24. The receiving plate 14 is provided with several sieve holes 141. The tower body 2 is provided with a large particle discharge pipe 3 that communicates with the outside of the partition ring 25. After the connecting hole 24 is blocked, the large particle discharge pipe 3 is opened. The opening and closing of the large particle discharge pipe 3 can be controlled by a control valve.

[0053] When using, combine Figures 1-7Various raw materials are supplied to the feed inlet 1 at the top of the tower 2. The raw materials then undergo desulfurization through the action of biological agents and the packing layer 8. Sulfur particles and liquid simultaneously fall to the bottom of the tower 2. Gas is supplied to the bottom of the tower 2 through the air inlet pipe (this gas can be oxygen-containing gas or inert gas, and its supply can be controlled according to the biological reaction state; this is existing technology and will not be elaborated further). Under the action of the aeration head 10, the small sulfur particles inside the liquid form foam-like scum that floats to the edge of the liquid. The suction head 9 floats on top of the liquid, and then the negative pressure mechanism adsorbs and removes the floating foam impurities, thus completing the removal of small sulfur particles. Under the action of aeration, large sulfur particles slide from the top surface of the intermediate body 114 to the top of the support plate 14. At this time, the liquid on the support plate 14 enters the outer side of the separating ring 25 through the support plate 14 and the screen holes 141, and then enters the interior of the separating ring 25 through the connecting holes 24, and is further discharged from the outlet. During the gradual accumulation of large sulfur particles, the support plate... As the sieve holes 141 of 14 are gradually blocked, liquid accumulates at the top of the discharge plate 11 and gradually increases. When it reaches a predetermined amount, the weight of the liquid exceeds the combined force of the suction force of the discharge plate 11 and the aeration head 10 and the thrust force of the thrust spring 12. At this point, the discharge plate 11 immediately separates from the aeration head 10 and slides down to the predetermined position. The connecting hole 24 is then blocked, and the liquid at the top passes through the guide vanes 115, pushing the discharge plate 11 to rotate. At this time, the sliding shaft 111 enters the annular groove 22 from the straight groove 21, and then the discharge... The material tray 11 rotates 180°, and the fixed teeth 23 on both sides mesh with the driven gear 143 one by one, so that all the material plates 14 rotate 180°. The side with large sulfur particles that were blocked rotates to the bottom. At this time, the liquid flows in reverse through the screen hole 141, flushing away the large sulfur particles, and is discharged from the tower body 2 through the large particle discharge pipe 3. At this time, the sliding shaft 111 rotates to the position of the straight groove 21 and enters the straight groove 21 under the action of the thrust spring 12. The intermediate body 114 is adsorbed to the bottom of the aeration head 10, completing the removal process.

[0054] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A biogas biological desulfurization device, characterized in that, The application relates to a sulfur removal tower. The tower body is provided with a circulating spray system at the top and a filler layer at the middle section. A sulfur removal system is arranged at the bottom of the tower body, which comprises: An aeration head arranged at the bottom of the tower body, which supplies gas to the inside of the liquid at the bottom of the tower body and further aerates the small sulfur particles in the inside of the liquid to the edge of the liquid surface, the inside of the tower body is provided with a suction mechanism for adsorbing the floating scum on the top of the liquid, the suction mechanism adsorbs and removes the floating substances on the top of the liquid. A discharge disc slidingly connected to the bottom of the tower body, which slides downward and discharges the large sulfur particles accumulated on the top of the discharge disc to the bottom of the discharge disc when the liquid on the top of the discharge disc is accumulated to a certain degree, the bottom of the tower body is provided with a discharge port for discharging the large sulfur particles. A connecting pipe is arranged between the aeration head and the bottom surface of the tower body, the connecting pipe extends from the bottom of the tower body to the outside of the tower body through a gas supply pipe, the gas supply pipe is connected with a gas supply mechanism, a thrust spring is arranged between the discharge disc and the bottom of the tower body, the top of the discharge disc has an adsorption force with the aeration head, when the liquid on the top of the discharge disc reaches a predetermined weight, the discharge disc slides downward under the action of gravity to overcome the adsorption force and the elastic force of the thrust spring. The discharge disc comprises: A middle body in a disc structure, the outer edge of the middle body is rotationally provided with a plurality of closely arranged material receiving plates, and the top of the middle body is provided with a material guiding bevel to guide the large sulfur particles to the top of the material receiving plates. A sliding sleeve is rotationally connected to the outside of the connecting pipe in the middle of the middle body, a flow guide vane is arranged between the sliding sleeve and the middle body, the flow guide vane drives the discharge disc to rotate under the action of liquid flow to make the material receiving plates overturn by 180 degrees, when the discharge disc slides to a predetermined position, the liquid on the top of the discharge disc flows through the flow guide vane to drive the middle body to rotate on the connecting pipe. The outer edge of the middle body is provided with a mounting ring, the material receiving plates are rotationally connected between the mounting ring and the middle body, rotating shafts are arranged on the two sides of the material receiving plates, driven gears are arranged on the rotating shafts matched with the mounting ring, the inside of the tower body is provided with fixed teeth corresponding to the driven gears, and the fixed teeth drive the driven gears to rotate by 180 degrees.

2. The biogas biological desulfurization device according to claim 1, characterized in that, The suction mechanism comprises: A suction pipe fixed to the tower body, one end of the suction pipe inside the tower body is vertically downward and faces the edge of the liquid; A suction head slidingly connected to the suction pipe and located inside the tower body, the suction head is suspended on the top surface of the liquid, the side wall of the suction head is provided with a suction port, and the suspended impurities on the top of the liquid are discharged out of the tower body through the suction port.

3. The biogas biological desulfurization device according to claim 2, characterized in that, The outer wall of the mounting ring is provided with a sliding shaft, the inside of the tower body is provided with a ring groove and a straight groove vertically communicated with the ring groove, when the sliding shaft is matched with the ring groove, the discharge disc rotates inside the ring groove, and the fixed teeth are arranged at the bottom of the ring groove.

4. The biogas biological desulfurization device according to claim 2, characterized in that, The outer ring of the connecting pipe is provided with a sealing ring, the bottom of the sliding sleeve is inserted into the inner part of the sealing ring, the thrust spring is arranged in the inner part of the sealing ring, and the thrust bearing is arranged between the thrust spring and the sliding sleeve.

5. The biogas biological desulfurization device according to claim 2, characterized in that, The bottom edge of the intermediate body is provided with a matching ring, the bottom of the tower body is provided with a separation ring which is sealed with the inner wall of the matching ring, the separation ring is provided with a communication hole, the tower body is provided with a liquid outlet in the inner part of the separation ring, the matching ring seals the communication hole when the matching ring slides to the predetermined position under the discharge disc, and the supporting plate is provided with a plurality of sieve holes.

6. The biogas biological desulfurization device according to claim 5, characterized in that, The tower body is provided with a large-particle discharge pipe which is in communication with the outer part of the separation ring.

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