Biological sulfur recovery and preparation system

Abstract

The utility model provides a biological sulfur recovery and preparation system, which comprises an absorption tower, a biological regeneration box, a stirring tank and a centrifugal machine which are sequentially connected, a sulfur-poor liquid spray head and a filler layer are arranged in the absorption tower, and a liquid distribution pipe communicated with the bottom of the absorption tower and used for conveying rich flow liquid and an aeration pipe positioned below the liquid distribution pipe are arranged in the biological regeneration box. The biological regeneration box is connected with the stirring tank through a sulfur mud conveying pipe, a feeding port is formed in the top of the stirring tank, and the centrifugal machine is used for centrifugally separating biological sulfur and clear liquid. According to the biological sulfur recovery and preparation system provided by the utility model, hydrogen sulfide is absorbed in the absorption tower, so that a sulfur-poor solution becomes a sulfur-rich solution, the sulfur-rich solution is sent to the biological regeneration box to be oxidized into elemental sulfur and then sent to the stirring tank, and biological sulfur with different particle sizes is generated by selecting different types of surfactants; finally, the biological sulfur is centrifugally collected under the action of a centrifugal machine, so that the elemental sulfur is fully recycled, and the biological sulfur with different particle sizes can be prepared.

Description

Technical Field

[0001] The utility model belongs to the technical field of biological sulfur recovery, and more specifically relates to a biological sulfur recovery and preparation system. Background Art

[0002] Biogas, natural gas and industrial waste gas containing hydrogen sulfide need to be treated to remove hydrogen sulfide before combustion or use. Among various desulfurization methods, biological desulfurization has the advantages of mild reaction conditions, high removal efficiency, recoverable sulfur, no secondary pollution and low cost, and has attracted more and more attention.

[0003] In the biological desulfurization process, hydrogen sulfide is first absorbed by the alkaline absorption liquid to form hydrosulfide, and then the hydrosulfide is oxidized to elemental sulfur by the metabolism of sulfur-oxidizing bacteria, and then the elemental sulfur is separated by sedimentation. The existing preparation equipment generally occupies a large area, the control method is relatively complicated, and the particle size of the obtained biosulfur is single, which makes it difficult to prepare biosulfur according to needs. Utility Model Content

[0004] The utility model aims to provide a biosulfur recovery and preparation system, which can simplify the structure of elemental sulfur recovery equipment and facilitate the acquisition of biosulfur with different particle sizes.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a biosulfur recovery and preparation system, including an absorption tower, a biological regeneration box, a stirring tank and a centrifuge connected in sequence, the absorption tower is provided with an air inlet at the bottom and an air outlet at the top, a sulfur-poor liquid nozzle and a packing layer located below the sulfur-poor liquid nozzle are provided in the absorption tower, the absorption tower is used to absorb hydrogen sulfide in the sulfur-containing gas to make the lean liquid form a sulfur-rich liquid, the biological regeneration box is provided with a liquid distribution pipe connected to the bottom of the absorption tower to transport the rich liquid and an aeration pipe located below the liquid distribution pipe, the biological regeneration box is connected to the stirring tank through a sulfur mud conveying pipe, a feed port for adding a surfactant is provided on the top of the stirring tank, the stirring tank is used to mix mud sulfur and surfactant to generate biosulfur, and the centrifuge is used to centrifugally separate biosulfur and clear liquid.

[0006] In a possible implementation, a first partition arranged along the up and down direction and a second partition located on the side of the first partition away from the absorption tower are further provided in the biological regeneration box. The first partition and the second partition separate the biological regeneration box into a degassing zone, an oxidation zone and a sedimentation zone. The oxidation zone is located between the first partition and the second partition, the degassing zone is arranged adjacent to the first partition and is connected to the oxidation zone, and the sedimentation zone is arranged adjacent to the second partition.

[0007] In a possible implementation, the degassing zone is provided with a first reflux pipe extending into the absorption tower and connected to the sulfur-lean liquid nozzle. The first reflux pipe is used to reflux the sulfur-lean liquid into the absorption tower. The sedimentation zone is used to sediment the sulfur sludge generated by aeration in the oxidation zone.

[0008] In some embodiments, the sedimentation zone is connected to the first reflux pipe via a second reflux pipe, a reflux pump is provided on the second reflux pipe, and the second reflux pipe is used to reflux the supernatant of the sedimentation zone to the first reflux pipe.

[0009] In some embodiments, the centrifuge is connected to the first reflux pipe via a third reflux pipe, and the third reflux pipe is used to reflux the liquid separated by the centrifuge into the first reflux pipe.

[0010] In some embodiments, the first reflux pipe extends into the absorption tower, and the liquid outlet end of the first reflux pipe is connected to the sulfur-lean liquid nozzle.

[0011] In a possible implementation, a deposition guide block is provided on one side of the second partition adjacent to the settling zone, and the deposition guide block extends obliquely downwardly away from the second partition to guide the sulfur sludge to move downward and aggregate and precipitate.

[0012] In some embodiments, a first anti-accumulation block is provided on the side of the second partition adjacent to the first partition, and the first anti-accumulation block extends obliquely downward toward the side away from the second partition; a second anti-accumulation block is provided between the side wall and the bottom wall of the biological regeneration box, and the second anti-accumulation block is located in the degassing zone and extends obliquely downward toward the side close to the oxidation zone.

[0013] In a possible implementation, a stirring shaft is rotatably connected in the stirring tube, a stirring blade is connected to the outer periphery of the stirring shaft, and a rotating driving member connected to the upper end of the stirring shaft and used to drive the stirring shaft to rotate is provided on the top of the stirring tank.

[0014] In some embodiments, a plurality of stirring blades are provided, and the plurality of stirring blades are spaced apart along the circumference of the stirring shaft.

[0015] The scheme shown in the embodiment of the present application is compared with the prior art. The biosulfur recovery and preparation system provided in the embodiment of the present application utilizes the absorption tower to effectively absorb hydrogen sulfide in the sulfur-containing gas to make the sulfur-depleted liquid into sulfur-rich liquid. The generated sulfur-rich liquid is sent to the biological regeneration tank and oxidized into elemental sulfur under the action of aerobic sulfur-oxidizing bacteria. The sulfur sludge containing elemental sulfur enters the mixing tank. By selecting different types of surfactants, biosulfur of different particle sizes is generated. Finally, the biosulfur is centrifugally collected under the action of a centrifuge. The above method realizes the full recovery of elemental sulfur, simplifies the recovery process, improves the recovery rate, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the main structure of a biological sulfur recovery and preparation system provided by an embodiment of the utility model;

[0018] Figure 2 For the utility model embodiment Figure 1 Schematic diagram of the structure of the biological regeneration box;

[0019] Figure 3 For the utility model embodiment Figure 1 Schematic diagram of the structure of the middle mixing tank;

[0020] Figure 4 A schematic diagram of the main structure of another embodiment of the biological sulfur recovery and preparation system provided by the utility model;

[0021] Figure 5 Long rod-shaped biosulfur prepared by the biosulfur recovery and preparation system provided in the embodiment of the utility model;

[0022] Figure 6 Nano-scale bio-sulfur prepared by the bio-sulfur recovery and preparation system provided in the embodiment of the utility model;

[0023] Figure 7 Untreated biosulfur granules.

[0024] Among them, the reference numerals in the figure are:

[0025] 1. Absorption tower; 11. Air inlet; 12. Air outlet; 13. Packing layer; 14. Sulfur-depleted liquid nozzle; 2. Biological regeneration box; 21. Liquid distribution pipe; 22. Aeration pipe; 23. Sulfur mud conveying pipe; 231. Sulfur mud pump; 232. First valve; 24. First partition; 25. Second partition; 251. Sedimentation guide block; 252. First anti-accumulation block; 253. Second anti-accumulation block; 26. Degassing zone; 27. Oxidation zone; 28. Sedimentation zone; 291. First reflux pipe; 292. Second reflux pipe; 293. Reflux pump; 294. Second valve; 3. Mixing tank; 31. Feed inlet; 32. Mixing shaft; 33. Mixing blade; 34. Rotating drive member; 4. Centrifuge; 41. Third reflux pipe. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0028] Please also read Figures 1 to 4 The biosulfur recovery and preparation system provided by the utility model is now described. The biosulfur recovery and preparation system comprises an absorption tower 1, a bioregeneration tank 2, a stirring tank 3 and a centrifuge 4 connected in sequence. The absorption tower 1 is provided with an air inlet 11 at the bottom and an air outlet 12 at the top. The absorption tower 1 is provided with a sulfur-poor liquid nozzle 14 and a packing layer 13 located below the sulfur-poor liquid nozzle 14. The absorption tower 1 is used to absorb hydrogen sulfide in sulfur-containing gas to make the lean liquid form a sulfur-rich liquid. The bioregeneration tank 2 is provided with a liquid distribution pipe 21 connected to the bottom of the absorption tower 1 to transport the rich liquid and an aeration pipe 22 located below the liquid distribution pipe 21. The bioregeneration tank 2 is connected to the stirring tank 3 through a sulfur mud delivery pipe 23. The top of the stirring tank 3 is provided with a feed port 31 for adding a surfactant. The stirring tank 3 is used to mix mud sulfur and a surfactant to generate biosulfur. The centrifuge 4 is used to centrifugally separate biosulfur and clear liquid.

[0029] The biosulfur recovery and preparation system provided in this embodiment, compared with the prior art, utilizes the absorption tower 1 to effectively absorb hydrogen sulfide in the sulfur-containing gas, so that the sulfur-poor liquid becomes the sulfur-rich liquid, and the generated sulfur-rich liquid is sent to the biological regeneration tank 2, oxidized to elemental sulfur under the action of aerobic sulfur-oxidizing bacteria, and the sulfur mud delivery pipe 23 containing elemental sulfur is sent to the stirring tank 3. By selecting different types of surfactants to generate biosulfur of different particle sizes, the biosulfur is finally centrifugally collected under the action of the centrifuge 4. The above method realizes the full recovery of elemental sulfur, simplifies the control process and the recovery process, and can prepare biosulfur of different particle sizes according to demand, which has good practicality.

[0030] Biosulfur is the main by-product of biological desulfurization. Compared with chemical sulfur, the growth rate of microorganisms utilizing biosulfur increases several to dozens of times, indicating that biosulfur is expected to become a good sulfur source. The above-mentioned recovery method can fully recover biosulfur and greatly improve the recovery efficiency of elemental sulfur.

[0031] In this embodiment, the absorption tower 1 is provided with a sulfur-depleted liquid nozzle 14 capable of spraying sulfur-depleted liquid, and ball rings and other fillers are placed in the packing layer 13. The ball ring filler is a new type of filler that can greatly improve the distribution performance of gas and liquid, increase the contact area between the two, and increase the reaction efficiency.

[0032] When in use, the sulfur-poor liquid nozzle 14 sprays the sulfur-poor liquid downward, and the sprayed sulfur-poor liquid contacts the sulfur-containing gas coming from the bottom in countercurrent in the packing layer 13, and the sulfur-poor liquid absorbs hydrogen sulfide to form sulfur-rich liquid. After a period of reaction, since the biological regeneration tank 2 and the stirring tank 3 can provide recycled sulfur-spraying liquid, if the amount of this part of the sulfur-poor liquid meets the preparation requirements, it is not necessary to supply the lean liquid to the sulfur-poor liquid nozzle 14 through an external pipeline.

[0033] It should be noted that the sulphur mud conveying pipe 23 extends to the inner bottom of the biological regeneration box 2 to facilitate the collection of sulphur mud. A sulphur mud pump 231 is provided on the sulphur mud conveying pipe 23. Under the action of the sulphur mud pump 231, the sulphur mud can be smoothly conveyed to the stirring tank 3 through the sulphur mud conveying pipe 23.

[0034] In one possible implementation, please also refer to Figures 1 to 4 The biological regeneration box 2 is also provided with a first partition 24 arranged in the up and down direction and a second partition 25 located on the side of the first partition 24 away from the absorption tower 1. The first partition 24 and the second partition 25 separate the biological regeneration box 2 into a degassing zone 26, an oxidation zone 27 and a sedimentation zone 28. The oxidation zone 27 is located between the first partition 24 and the second partition 25. The degassing zone 26 is adjacent to the first partition 24 and is connected to the oxidation zone 27. The sedimentation zone 28 is adjacent to the second partition 25.

[0035] In this embodiment, the sulfur-rich liquid is dispersed in the oxidation zone 27 of the biological regeneration tank 2 through the liquid distribution pipe 21. Under the action of the aeration pipe 22, the sulfur-rich liquid can be converted into elemental sulfur under the action of aerobic sulfur-oxidizing bacteria and exists in the form of sulfur sludge. The sulfur sludge is sent to the mixing tank 3 under the action of the sulfur sludge pump 231 for subsequent treatment to finally obtain biological sulfur.

[0036] Since the sulfur-rich liquid has undergone sufficient oxidation reaction in the biological regeneration tank 2 to be converted into elemental sulfur, the liquids in the biological regeneration tank 2, the stirring tank 3 and the centrifuge 4 after the reaction are all sulfur-poor liquids, which can be sent back to the absorption tower 1 and sprayed out through the sulfur-poor liquid nozzle 14 for reuse to absorb hydrogen sulfide and form sulfur-rich liquid again.

[0037] Specifically, the biological regeneration tank 2 is divided into a degassing zone 26, an oxidation zone 27 and a settling zone 28 by a first partition 24 and a second partition 25. A gap is provided between the lower part of the first partition 24 and the inner bottom wall of the biological regeneration tank 2, so that the degassing zone 26 and the oxidation zone 27 are interconnected. The settling zone 28 can be used for the reaction liquid with a high sulfur content to settle into sulfur sludge, and the sulfur sludge in the settling zone 28 can be transported backward by a sulfur sludge pump 231.

[0038] It should be noted that the solution in the oxidation zone 27 enters the degassing zone 26 through the gap below the first partition 24. During this process, most of the bubbles in the solution in the oxidation zone 27 will burst, and the gas will move upward to the top space of the biological regeneration tank 2, thereby achieving the purpose of removing the gas and realizing the deoxygenation of the sulfur-depleted liquid.

[0039] In one possible implementation, please also refer to Figures 1 to 4 The degassing zone 26 is provided with a first reflux pipe 291 extending into the absorption tower 1 and connected to the sulfur-poor liquid nozzle 14. The first reflux pipe 291 is used to reflux the sulfur-poor liquid into the absorption tower 1. The settling zone 28 is used to settle the sulfur sludge generated by aeration in the oxidation zone 27. The sulfur-poor liquid in the degassing zone 26 is refluxed into the absorption tower 1 through the first reflux pipe 291, reabsorbs hydrogen sulfide and becomes sulfur-rich liquid and is sent to the biological regeneration tank 2, thereby realizing the full reuse of the sulfur-poor liquid.

[0040] In some embodiments, please refer to Figures 1 to 3 The settling area 28 is connected to the first reflux pipe 291 through a second reflux pipe 292. A reflux pump 293 is provided on the second reflux pipe 292. The second reflux pipe 292 is used to reflux the supernatant of the settling area 28 to the first reflux pipe 291. The supernatant floating on the sulfur mud in the settling area 28 can be sent to the absorption tower 1 for reuse by the second reflux pipe 292. The second reflux pipe 292 is connected to the first reflux pipe 291, which can simplify the layout of the pipeline and reduce the overall cost of the equipment.

[0041] See also Figure 4As a parallel embodiment, in order to reduce the number of equipment, the reflux pump 293 can be omitted, and the second reflux pipe 292 is connected to the sulfur mud pump 231, and the sulfur mud pump 231 is used to reflux the supernatant to the absorption tower 1 or to transport sulfur mud to the stirring tank 3 in time periods. A first valve 232 is set on the sulfur mud transport pipe 23, and a second valve 294 is set on the second reflux pipe 292. The first valve 232 is set on the side of the sulfur mud pump 231 close to the stirring tank 3.

[0042] When in use, first close the second valve 294 and open the first valve 232, and use the sulfur mud pump 231 to first send the sulfur mud to the stirring tank 3. After completion, open the second valve 294 and close the first valve 232, and use the sulfur mud pump 231 to return the supernatant to the absorption tower 1.

[0043] In some embodiments, please refer to Figures 1 to 4 The centrifuge 4 is connected to the first reflux pipe 291 through the third reflux pipe 41, and the third reflux pipe 41 is used to reflux the liquid separated by the centrifuge 4 into the first reflux pipe 291. The liquid generated by centrifugation in the centrifuge 4 is also sulfur-depleted liquid. This part of the liquid is sent to the first reflux pipe 291 through the third reflux pipe 41, thereby achieving full reuse of the sulfur-depleted liquid in the entire process and reducing the operating cost of the equipment.

[0044] In some embodiments, please refer to Figures 1 to 4 The first reflux pipe 291 extends into the absorption tower 1, and the liquid outlet end of the first reflux pipe 291 is connected to the sulfur-depleted liquid nozzle 14. The sulfur-depleted liquid nozzle 14 on the first reflux pipe 291 can evenly disperse the sulfur-depleted liquid on the packing layer 13, ensuring sufficient contact between the sulfur-depleted liquid and hydrogen sulfide in the sulfur-containing gas, thereby improving the recovery rate of elemental sulfur.

[0045] In one possible implementation, please also refer to Figures 1 to 4 A sedimentation guide block 251 is provided on one side of the second partition 25 adjacent to the sedimentation area 28. The sedimentation guide block 251 extends obliquely downwardly from the side away from the second partition 25 to guide the sulfur sludge to move downward and aggregate and precipitate. The sedimentation guide block 251 gradually extends obliquely downwardly from the inside to the outside of the biological regeneration box 2. Under the guidance of the above-mentioned inclined surface, the sulfur sludge can be orderly settled at the bottom of the sedimentation area 28. The sulfur sludge conveying pipe 23 connected to the sulfur sludge pump 231 extends to the above-mentioned sedimentation area 28, which can effectively convey the sulfur sludge.

[0046] In some embodiments, please refer to Figures 1 to 4A first anti-accumulation block 252 is provided on the side of the second partition 25 adjacent to the first partition 24, and the first anti-accumulation block 252 extends obliquely downwardly toward the side away from the second partition 25; a second anti-accumulation block 253 is provided between the side wall and the bottom wall of the biological regeneration box 2, and the second anti-accumulation block 253 is located in the degassing zone 26 and extends obliquely downwardly toward the side close to the oxidation zone 27.

[0047] In the present embodiment, when the sulfur-rich liquid is oxidized in the biological regeneration tank 2, in order to prevent the sulfur sludge from precipitating in the degassing zone 26 or the oxidation zone 27 and affecting its transfer to the sedimentation zone, a first anti-accumulation block 252 is provided in the degassing zone 26, and a second anti-accumulation block 253 is provided in the oxidation zone 27, so that the sulfur sludge can move to the sedimentation zone 28 under the action of the aeration pipe 22 and settle in the sedimentation zone 28, thereby improving the collection efficiency of the sulfur sludge.

[0048] In one possible implementation, please also refer to Figures 1 to 4 A stirring shaft 32 is rotatably connected in the stirring tube, a stirring blade 33 is connected to the outer periphery of the stirring shaft 32, and a rotating driving member 34 connected to the upper end of the stirring shaft 32 and used to drive the stirring shaft 32 to rotate is provided on the top of the stirring tank 3.

[0049] In this embodiment, the rotary drive member 34 is used to drive the stirring shaft 32 to rotate, and the stirring shaft 32 can synchronously drive the stirring blades 33 to rotate. The stirring blades 33 fully mix the sulfur mud and the surfactant in the stirring tank 3, so that the two react to generate biosulfur.

[0050] Specifically, biosulfur of different particle sizes can be prepared by changing the type of added surfactant, which greatly expands the preparation range of biosulfur and meets the preparation needs of biosulfur of different particle sizes.

[0051] See also Figure 5 and Figure 6 , Figure 5 The long rod-shaped biosulfur and Figure 6 The nano-scale biosulfur is the biosulfur prepared by the above equipment, wherein the surfactant added when preparing the long rod-shaped biosulfur is Tween 80, and the surfactant added when preparing the nano-scale biosulfur is chitosan. The particles of the long rod-shaped biosulfur are about 10 microns × 1 micron, and the particle size of the nano-scale biosulfur is 50-100 nanometers.

[0052] contrast Figure 7 The untreated biosulfur in the medium, the biosulfur recovery and preparation system provided in this embodiment can prepare biosulfur of different particle sizes, meeting different preparation requirements of biosulfur.

[0053] In some embodiments, please refer to Figures 1 to 4A plurality of stirring blades 33 are provided, and the plurality of stirring blades 33 are arranged at intervals along the circumference of the stirring shaft 32. This arrangement can enhance the disturbance effect and increase the reaction rate.

[0054] The above-mentioned biosulfur recovery and preparation system utilizes the absorption tower 1 to effectively absorb hydrogen sulfide in the sulfur-containing gas, so that the sulfur-depleted liquid becomes a sulfur-rich liquid. The generated sulfur-rich liquid is sent to the biological regeneration tank 2, and is oxidized into elemental sulfur under the action of aerobic sulfur-oxidizing bacteria. The sulfur sludge containing elemental sulfur enters the stirring tank 3, and biosulfur of different particle sizes is generated by selecting different types of surfactants. Finally, the biosulfur is centrifugally collected under the action of the centrifuge 4. The above-mentioned method realizes the full recovery of elemental sulfur, simplifies the control process and the recovery process, and can prepare biosulfur of different particle sizes according to demand, which has good practicality.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A biological sulfur recovery and preparation system, characterized in that: The invention comprises an absorption tower (1), a biological regeneration tank (2), a stirring tank (3) and a centrifuge (4) which are connected in sequence. The bottom of the absorption tower (1) is provided with an air inlet (11), and the top is provided with an air outlet (12). The absorption tower (1) is provided with a sulfur-poor liquid nozzle (14) and a packing layer (13) located below the sulfur-poor liquid nozzle (14). The absorption tower (1) is used to absorb hydrogen sulfide in the sulfur-containing gas so that the lean liquid is converted into sulfur-rich liquid. The biological regeneration tank (2) is provided with a The bottom of the absorption tower (1) is connected to a liquid distribution pipe (21) for conveying rich liquid and an aeration pipe (22) located below the liquid distribution pipe (21); the biological regeneration tank (2) is connected to the stirring tank (3) through a sulfur mud conveying pipe (23); a feed port (31) for adding a surfactant is provided at the top of the stirring tank (3); the stirring tank (3) is used to mix mud sulfur and a surfactant to generate biological sulfur; and the centrifuge (4) is used to centrifugally separate the biological sulfur and the clear liquid.

2. The biological sulfur recovery and preparation system according to claim 1, characterized in that: The biological regeneration box (2) is further provided with a first partition (24) arranged in the up-down direction and a second partition (25) located on the side of the first partition (24) away from the absorption tower (1); the first partition (24) and the second partition (25) separate the biological regeneration box (2) into a degassing zone (26), an oxidation zone (27) and a sedimentation zone (28); the oxidation zone (27) is located between the first partition (24) and the second partition (25); the degassing zone (26) is arranged adjacent to the first partition (24) and is connected to the oxidation zone (27); the sedimentation zone (28) is arranged adjacent to the second partition (25).

3. The biological sulfur recovery and preparation system according to claim 2, characterized in that: The degassing zone (26) is provided with a first reflux pipe (291) extending into the absorption tower (1) and connected to the sulfur-lean liquid nozzle (14); the first reflux pipe (291) is used to reflux the sulfur-lean liquid into the absorption tower (1); and the settling zone (28) is used to settle the sulfur sludge generated by aeration in the oxidation zone (27).

4. The biological sulfur recovery and preparation system according to claim 3, characterized in that: The sedimentation zone (28) is connected to the first reflux pipe (291) via a second reflux pipe (292). A reflux pump (293) is provided on the second reflux pipe (292). The second reflux pipe (292) is used to reflux the supernatant of the sedimentation zone (28) to the first reflux pipe (291).

5. The biological sulfur recovery and preparation system according to claim 4, characterized in that: The centrifuge (4) is connected to the first reflux pipe (291) via a third reflux pipe (41), and the third reflux pipe (41) is used to reflux the liquid separated by the centrifuge (4) into the first reflux pipe (291).

6. The biological sulfur recovery and preparation system according to claim 5, characterized in that: The first reflux pipe (291) extends into the absorption tower (1), and the liquid outlet end of the first reflux pipe (291) is connected to the sulfur-lean liquid nozzle (14).

7. The biological sulfur recovery and preparation system according to claim 2, characterized in that: A sedimentation guide block (251) is provided on one side of the second partition (25) adjacent to the sedimentation zone (28), and the sedimentation guide block (251) extends obliquely downwardly away from the side of the second partition (25) to guide the sulphur sludge to move downward and aggregate and precipitate.

8. The biological sulfur recovery and preparation system according to claim 7, characterized in that: A first anti-accumulation block (252) is provided on the side of the second partition (25) adjacent to the first partition (24), and the first anti-accumulation block (252) extends obliquely downwardly away from the second partition (25); a second anti-accumulation block (253) is provided between the side wall and the bottom wall of the biological regeneration box (2), and the second anti-accumulation block (253) is located in the degassing zone (26) and extends obliquely downwardly toward the side close to the oxidation zone (27).

9. The biological sulfur recovery and preparation system according to any one of claims 1 to 8, characterized in that: A stirring shaft (32) is rotatably connected inside the stirring tank (3), and a stirring blade (33) is connected to the outer periphery of the stirring shaft (32). A rotating driving member (34) connected to the upper end of the stirring shaft (32) and used to drive the stirring shaft (32) to rotate is provided at the top of the stirring tank (3).

10. The biological sulfur recovery and preparation system according to claim 9, characterized in that: A plurality of stirring blades (33) are provided, and the plurality of stirring blades (33) are arranged at intervals along the circumference of the stirring shaft (32).

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