A biogas purification and recycling device and process based on sewage treatment plants

Abstract

The invention relates to the technical field of biogas purification, and specifically discloses a biogas purification and recycling device and process based on a sewage treatment plant, comprising a cleaning tower, a bioreactor and a gravity settler, wherein one end of the cleaning tower is connected to a first pipeline, a cleaning component is arranged inside the cleaning tower, the cleaning component comprises a first cover, which is fixed to the inner wall of the cleaning tower through a connecting block, a gap is provided around the first cover and the cleaning tower, a fourth pipeline is connected to the top of the first cover, the other end of the fourth pipeline is connected to the top of the bioreactor and extends to below the liquid surface in the bioreactor, and a plurality of discharge holes are provided at the bottom of the first cover; a filler is installed in the middle of the cleaning tower, a cavity is formed between its bottom and the inner bottom of the cleaning tower, a rising hole and fine holes are provided in the middle of the filler, a flat cavity is provided at the bottom of the filler, the rising hole and the fine holes both extend from the top of the filler to the flat cavity, and the rising hole is arranged in a spiral shape.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas purification, and in particular to a biogas purification and recycling device and process based on a sewage treatment plant. Background Art

[0002] Biogas purification is a complex but important process, which aims to increase the concentration of methane (CH4) in biogas and reduce the content of other impurity gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S). In the biogas purification process, the scrubbing tower (also known as the desulfurization tower, water scrubber, etc.) plays a key role in removing impurity gases in biogas. The specific process is that the biogas enters from the bottom of the water scrubber and is dispersed into a large number of small bubbles through the gas dispersion device and evenly distributed in the water. During the rising process, water-soluble gases such as CO2 and H2S dissolve in the water, thereby achieving purification;

[0003] Prior art patent publication number CN102851090A discloses a biogas dry filtration desulfurization system and a preparation method thereof, the device comprises a biogas inlet pipe, the biogas inlet pipe is connected to an inlet cabinet, the inlet cabinet is connected to a desulfurization absorption tower, the upper part of the desulfurization absorption tower is connected to a gas-liquid separator, the gas-liquid separator is connected to a gas washing tower, the gas washing tower is connected to a dry desulfurizer, the upper part of the dry desulfurizer is connected to a dust collector, the bottom of the dry desulfurizer is connected to a sulfide pipe, the dust collector is connected to a compressor, and the compressor is connected to a biogas outlet pipe;

[0004] In the prior art, when desulfurizing biogas, biological bacteria react with sulfur in the biogas to generate elemental sulfur or sulfate solution, and then separate and extract the elemental sulfur or sulfate solution to achieve biogas purification. However, when biogas and biological bacteria solution are mixed in the prior art, they are mixed in the pores in the filler. Since the inner diameter of the pores in the filler is small, the elemental sulfur and sulfate generated by the reaction of biogas and bacteria easily clog the pores, resulting in the inability of new biogas to rise through the filler, thereby greatly reducing the efficiency of the reaction. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] The present invention provides a biogas purification and recycling device and process based on a sewage treatment plant, which can solve the problem that the filler in the cleaning tower is easily blocked in the prior art. The specific scheme is as follows:

[0007] On the one hand, the present invention provides a biogas purification and recycling device based on a sewage treatment plant, comprising a cleaning tower, a bioreactor and a gravity settler, one end of the cleaning tower is connected to a first pipeline, a cleaning component is arranged inside the cleaning tower, and the cleaning component comprises:

[0008] A first cover is fixed to the inner wall of the cleaning tower through a connecting block, a gap is formed between the periphery of the first cover and the cleaning tower, a fourth pipe is connected to the top of the first cover, the other end of the fourth pipe is connected to the top of the bioreactor and extends below the liquid surface in the bioreactor, and a plurality of discharge holes are opened at the bottom of the first cover;

[0009] A filler is installed in the middle of the cleaning tower, and a cavity is formed between its bottom and the inner bottom of the cleaning tower. A rising hole and fine holes are opened in the middle of the filler, and a flat cavity is opened at the bottom of the filler. The rising hole and fine holes extend from the top of the filler to the flat cavity, and the rising hole is arranged in a spiral shape;

[0010] A second cover, the second cover is connected to one end of the first pipeline located in the cleaning tower, and a plurality of air outlet holes are opened on the top of the second cover;

[0011] Wherein, a plurality of rising holes in the middle of the filler penetrate to the bottom of the filler and are located within the circumference of the top of the second cover;

[0012] A driving shaft is rotatably mounted in the middle of the first cover, and an extrusion structure is connected to the bottom of the driving shaft. A pressure structure matching the extrusion structure is connected to the top of the filler. When the driving shaft rotates under the drive of an external force, the extrusion structure squeezes the pressure structure, which can cause the filler to move along the radial direction of the driving shaft.

[0013] In the above scheme, when the driving shaft of the driving device rotates, the extrusion structure at its bottom squeezes the pressure structure at the top of the filler 109, so that the filler can achieve eccentric shaking. When shaking, the solids remaining in the filler can fall quickly, avoiding blockage of the pores of the filler and increasing the service life of the filler.

[0014] Preferably, a second pipeline is connected to the bottom of the cleaning tower, a first pump is connected to the middle of the second pipeline, the other end of the second pipeline is connected to the top of the bioreactor, a third pipeline is connected between the bottom of the bioreactor and the top of the gravity settler, a second pump is connected to the middle of the third pipeline, an air inlet and a feed port are connected to the top of the bioreactor, a blower is installed on the top of the air inlet for injecting air into the bioreactor, and the feed port is used to add biological strains;

[0015] In the above scheme, the biological bacteria in the bioreactor are mixed with the biogas to react with the sulfur element in the biogas to generate elemental sulfur or sulfate solution, thereby achieving desulfurization of the biogas, purifying the biogas, and improving the combustion efficiency of the biogas. The external air is injected into the bioreactor through a blower, which can promote the respiration of microorganisms, enhance microbial metabolism, and improve the activity of microorganisms, so as to better react with the biogas.

[0016] Preferably, a filter press is installed at the bottom of the gravity settler, a motor is installed at one end of the filter press, a spiral piece is rotatably installed inside the filter press, the output end of the motor is fixedly connected to one end of the spiral piece, the motor can drive the spiral piece to rotate inside the filter press, one end of the filter press is connected to a discharge pipe, and the middle part of the filter press is connected to a water outlet pipe. The filter press is used for solid-liquid separation of sulfur sludge, the formed liquid can be used as a fertilizer or fungicide, and the formed solid is a liquid suspension concentrate.

[0017] Preferably, a frame is provided outside the cleaning tower, the bioreactor and the gravity settler, and the outer walls of the cleaning tower, the bioreactor and the gravity settler are fixedly connected to the inner wall of the frame.

[0018] Preferably, an outlet pipe is fixedly connected to the top of the cleaning tower, and one end of the outlet pipe located inside the cleaning tower is connected to an air collecting hood. The top of the driving shaft is connected to a first fan blade. When the driving shaft rotates forward, the wind direction of the first fan blade is upward, and the wind force range of the first fan blade is within the coverage range of the air collecting hood. The middle part of the fourth pipeline is connected to a third pump and a pressure gauge.

[0019] Preferably, a rotating sleeve is connected to the top of the first cover, and a rotating block is connected to one end of the driving shaft. The rotating block is rotatably connected to the inner wall of the rotating sleeve. A spiral groove is provided in the middle of the rotating block. The spiral groove runs through the upper and lower ends of the rotating block. The high-pressure liquid in the fourth pipe impacts the spiral groove, thereby driving the rotating block to rotate, and then causing the driving shaft to rotate forward.

[0020] In the above scheme, when the third pump injects the biological strains in the bioreactor into the cleaning tower from the fourth pipeline, under the action of the pressurization of the third pump, the liquid impacts the rotating block. When the liquid passes through the spiral groove, it can drive the rotating block to rotate, and then drive the drive shaft to rotate synchronously, thereby realizing the driving effect of the drive shaft.

[0021] Preferably, a first limit groove is opened at the left and right ends of the filler, a first limit block is connected to the inner wall of the cleaning tower, a spring is connected between the first limit groove and the first limit block, a second limit block is opened at the bottom of the filler, a second limit groove is opened on the inner wall of the cleaning tower, and the second limit block is slidably connected to the second limit groove.

[0022] Preferably, a discharge port is provided in the middle of the first pipe, the discharge port is inclined, an inner wall of the discharge port is connected to an inclined plate, a second fan blade is connected to the lower part of the drive shaft, when the drive shaft rotates forward, the wind direction of the second fan blade faces upward, a spoiler and a guide groove are connected to the middle part of the drive shaft, the spoiler and the guide groove are located in the first cover, the spoiler is used to evenly distribute the biological strains in the first cover, and the guide groove is used to allow the biological strains to be thrown to the surroundings of the first cover;

[0023] In the above scheme, by setting an inclined discharge port, when biogas is injected, biogas will not leak out from the discharge port, when elemental sulfur or sulfate solution descends, it will not flow back from the first pipe, and through the spoiler and the guide groove, the biological bacteria solution is evenly distributed inside the first cover, so that when the biological bacteria descends, it can be evenly mixed with the biogas, thereby improving the reaction efficiency of the bacteria and biogas;

[0024] It should be noted that the rotation of the second blade and the first blade generates upward wind force, thereby increasing the lift of the biogas, thereby increasing the reaction rate of the biogas and biological bacteria, and preventing the biogas from staying inside the cleaning tower for a long time.

[0025] Preferably, a driving disk is connected to the bottom of the driving shaft, a first protrusion is connected around the driving disk, a driving ring is connected to the top of the filler, and a second protrusion is connected to the inner wall of the driving ring. When the driving shaft rotates to cause the first protrusion to abut against the second protrusion, the filler slides toward the second protrusion. When the first protrusion leaves the second protrusion, under the action of a spring, the filler returns to the middle position of the cleaning tower. The outer wall of the filler is provided with convex teeth, and the inner wall of the cleaning tower is connected to a paddle. When the filler moves, the paddle abuts against the convex teeth, causing the filler to vibrate.

[0026] On the other hand, the present invention provides a biogas purification and recycling process based on a sewage treatment plant, comprising the following steps:

[0027] S1. Add sodium hydroxide into the cleaning tower, inject the biogas to be treated into the cleaning tower from the first pipeline, and inject the biological bacteria into the bioreactor;

[0028] S2, biogas rises from the bottom of the cleaning tower through the packing to the top of the cleaning tower, and the biological bacteria in the bioreactor are injected into the cleaning tower from the fourth pipeline. The biological bacteria come into contact with the biogas and react with the sulfur element in the biogas to generate elemental sulfur or sulfate solution. The solution falls to the bottom of the cleaning tower and is transported to the bioreactor through the second pipeline;

[0029] S3, the cleaned biogas is discharged from the top of the cleaning tower;

[0030] S4. The elemental sulfur or sulfate solution is transported to the interior of the gravity settler for sedimentation, and the settled material is transported to a filter press or a centrifuge for dehydration to form a liquid suspension concentrate.

[0031] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0032] 1. The driving shaft is rotated by the driving device, and the extrusion structure at the bottom of the driving shaft squeezes the pressure structure at the top of the filler 109, so that the filler can achieve eccentric shaking. When shaking, the solids remaining in the filler can fall quickly to avoid clogging the pores of the filler and increase the service life of the filler.

[0033] 2. By mixing the biological bacteria in the bioreactor with the biogas, the sulfur element in the biogas reacts to generate elemental sulfur or sulfate solution, thereby achieving desulfurization of the biogas, purifying the biogas and improving the combustion efficiency of the biogas. By injecting external air into the bioreactor through a blower, the respiration of microorganisms can be promoted, the metabolism of microorganisms can be enhanced, and the activity of microorganisms can be increased, so that they can react better with the biogas.

[0034] 3. By setting an inclined discharge port, when biogas is injected, the biogas will not leak from the discharge port, and when the elemental sulfur or sulfate solution descends, it will not flow back from the first pipe. In addition, through the spoiler and the guide groove, the biological bacteria solution is evenly distributed inside the first cover, so that when the biological bacteria descends, it can be evenly mixed with the biogas, thereby improving the reaction efficiency of the bacteria and biogas.

[0035] 4. When the biological strains in the bioreactor are injected into the cleaning tower from the fourth pipeline through the third pump, the liquid impacts the rotating block under the pressure of the third pump. When the liquid passes through the spiral groove, it can drive the rotating block to rotate, and then drive the driving shaft to rotate synchronously, thereby realizing the driving effect of the driving shaft.

[0036] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative labor. Among them:

[0038] Figure 1 It is an overall stereogram of the present invention;

[0039] Figure 2 It is a front view of the present invention;

[0040] Figure 3 is a cross-sectional view of a cleaning tower of the present invention;

[0041] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0042] Figure 5 It is a front cross-sectional view of the cleaning tower of the present invention;

[0043] Figure 6 It is a partial cross-sectional view of the cleaning tower of the present invention;

[0044] Figure 7 is a three-dimensional diagram of the drive shaft of the present invention;

[0045] Figure 8 It is a schematic diagram of the drive shaft and packing of the present invention;

[0046] Fig. 9 It is a schematic diagram of the structure of the driving disk and the driving ring of the present invention;

[0047] Fig.10 is a cross-sectional view of the packing of the present invention;

[0048] Fig.11 This is a schematic diagram of the installation of the packing of the present invention;

[0049] Fig.12 It is a partial cross-sectional view of the packing of the present invention;

[0050] Fig.13 This is a schematic diagram of the front installation of the packing of the present invention.

[0051] The reference numerals are as follows:

[0052] 1. Cleaning tower; 101. First cover; 102. Rotating sleeve; 103. Driving shaft; 104. First blade; 105. Spiral groove; 106. Discharge hole; 107. Spoiler; 108. Guide groove; 109. Filler; 1091. Rising hole; 1092. Fine hole; 1093. First limit groove; 1094. Protruding tooth; 1095. Second limit block; 1096. Driving ring; 1097. Second convex block; 1098. Flat cavity; 110. Second blade; 111. Driving disk; 112. First convex block; 113. Rotating block; 2. Bioreactor Response device; 201, air inlet; 202, feed inlet; 3, gravity settler; 4, filter cartridge; 401, motor; 402, discharge pipe; 403, water outlet pipe; 5, first pipeline; 501, discharge port; 502, inclined plate; 503, second cover; 504, air outlet; 6, second pipeline; 601, first pump; 7, third pipeline; 701, second pump; 8, fourth pipeline; 801, third pump; 802, pressure gauge; 9, air outlet pipe; 901, air collecting hood; 10, frame; 11, first limit block; 12, second limit groove; 13, spring. DETAILED DESCRIPTION

[0053] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0054] Example 1: See Figure 1-Figure 13 This embodiment provides a biogas purification and recycling device based on a sewage treatment plant, comprising a cleaning tower 1, a bioreactor 2 and a gravity settler 3. One end of the cleaning tower 1 is connected to a first pipeline 5. A cleaning component is arranged inside the cleaning tower 1. The cleaning component comprises:

[0055] The first cover 101 is fixed to the inner wall of the cleaning tower 1 through a connecting block, and there is a gap between the first cover 101 and the cleaning tower 1. The top of the first cover 101 is connected to a fourth pipe 8, and the other end of the fourth pipe 8 is connected to the top of the bioreactor 2 and extends below the liquid surface in the bioreactor 2. The bottom of the first cover 101 is provided with a plurality of discharge holes 106;

[0056] The packing 109 is installed in the middle of the cleaning tower 1, and a cavity is formed between its bottom and the inner bottom of the cleaning tower 1. A rising hole 1091 and a fine hole 1092 are opened in the middle of the packing 109, and a flat cavity 1098 is opened at the bottom of the packing 109. The rising hole 1091 and the fine hole 1092 extend from the top of the packing 109 to the flat cavity 1098, and the rising hole 1091 is arranged in a spiral shape;

[0057] A second cover 503, the second cover 503 is connected to one end of the first pipe 5 located in the cleaning tower 1, and a plurality of air outlet holes 504 are opened on the top of the second cover 503;

[0058] Among them, a plurality of rising holes 1091 in the middle of the filler 109 penetrate to the bottom of the filler 109 and are located within the circumference of the top of the second cover 503;

[0059] The driving shaft 103 is rotatably mounted in the middle of the first cover 101, and the bottom of the driving shaft 103 is connected to an extrusion structure, and the top of the filler 109 is connected to a pressure structure matching the extrusion structure. When the driving shaft 103 rotates under the drive of an external force, the extrusion structure squeezes the pressure structure, which can cause the filler 109 to move along the radial direction of the driving shaft 103;

[0060] In the above scheme, when the driving device drives the shaft 103 to rotate, the extrusion structure at its bottom squeezes the pressure structure at the top of the filler 109, so that the filler 109 can achieve eccentric shaking. When shaking, the solids remaining in the filler 109 can fall quickly, avoiding blockage of the pores of the filler 109 and increasing the service life of the filler 109.

[0061] As a possible embodiment, the bottom of the cleaning tower 1 is connected to a second pipe 6, the middle of the second pipe 6 is connected to a first pump 601, the other end of the second pipe 6 is connected to the top of the bioreactor 2, a third pipe 7 is connected between the bottom of the bioreactor 2 and the top of the gravity settler 3, the middle of the third pipe 7 is connected to a second pump 701, the top of the bioreactor 2 is connected to an air inlet 201 and a feed port 202, a blower is installed on the top of the air inlet 201 for injecting air into the bioreactor 2, and the feed port 202 is used to add biological strains;

[0062] In the above scheme, the biological bacteria in the bioreactor 2 are mixed with the biogas to react with the sulfur element in the biogas to generate elemental sulfur or sulfate solution, thereby achieving desulfurization of the biogas, purifying the biogas, and improving the combustion efficiency of the biogas. The external air is injected into the bioreactor 2 by the blower, which can promote the respiration of the microorganisms, enhance the metabolism of the microorganisms, and improve the activity of the microorganisms, so as to better react with the biogas.

[0063] As a possible embodiment, a filter press cartridge 4 is installed at the bottom of the gravity settler 3, a motor 401 is installed at one end of the filter press cartridge 4, a spiral blade is rotatably installed inside the filter press cartridge 4, the output end of the motor 401 is fixedly connected to one end of the spiral blade, and the motor 401 can drive the spiral blade to rotate inside the filter press cartridge 4. A discharge pipe 402 is connected to one end of the filter press cartridge 4, and a water outlet pipe 403 is connected to the middle of the filter press cartridge 4. The filter press cartridge 4 is used for solid-liquid separation of sulfur sludge, and the formed liquid can be used as a fertilizer or a fungicide, and the formed solid is a liquid suspension concentrate.

[0064] As a possible embodiment, a frame 10 is provided outside the cleaning tower 1 , the bioreactor 2 and the gravity settler 3 , and the outer walls of the cleaning tower 1 , the bioreactor 2 and the gravity settler 3 are fixedly connected to the inner wall of the frame 10 .

[0065] As a possible embodiment, an air outlet pipe 9 is fixedly connected to the top of the cleaning tower 1, and one end of the air outlet pipe 9 located inside the cleaning tower 1 is connected to an air collecting hood 901. The top of the driving shaft 103 is connected to a first fan blade 104. When the driving shaft 103 rotates forward, the wind direction of the first fan blade 104 is upward, and the wind force range of the first fan blade 104 is within the coverage range of the air collecting hood 901. The middle part of the fourth pipe 8 is connected to a third pump 801 and a pressure gauge 802.

[0066] As a possible embodiment, a rotating sleeve 102 is connected to the top of the first cover 101, and a rotating block 113 is connected to one end of the driving shaft 103. The rotating block 113 is rotatably connected to the inner wall of the rotating sleeve 102. A spiral groove 105 is opened in the middle of the rotating block 113. The spiral groove 105 runs through the upper and lower ends of the rotating block 113. The high-pressure liquid in the fourth pipe 8 impacts the spiral groove 105, which can drive the rotating block 113 to rotate, and then make the driving shaft 103 rotate forward.

[0067] In the above scheme, when the third pump 801 injects the biological strains in the bioreactor 2 into the cleaning tower 1 from the fourth pipeline 8, under the pressurized action of the third pump 801, the liquid impacts the rotating block 113. When the liquid passes through the spiral groove 105, it can drive the rotating block 113 to rotate, and then drive the driving shaft 103 to rotate synchronously, thereby realizing the driving effect of the driving shaft 103.

[0068] As a possible embodiment, a first limiting groove 1093 is provided at the left and right ends of the filler 109, a first limiting block 11 is connected to the inner wall of the cleaning tower 1, a spring 13 is connected between the first limiting groove 1093 and the first limiting block 11, a second limiting block 1095 is provided at the bottom of the filler 109, a second limiting groove 12 is provided on the inner wall of the cleaning tower 1, and the second limiting block 1095 is slidably connected to the second limiting groove 12.

[0069] As a possible embodiment, a discharge port 501 is provided in the middle of the first pipe 5, the discharge port 501 is tilted, an inner wall of the discharge port 501 is connected to an inclined plate 502, a second fan blade 110 is connected to the lower part of the drive shaft 103, when the drive shaft 103 rotates forward, the wind direction of the second fan blade 110 faces upward, a spoiler 107 and a guide groove 108 are connected to the middle part of the drive shaft 103, the spoiler 107 and the guide groove 108 are located in the first cover 101, the spoiler 107 is used to evenly distribute the biological strains in the first cover 101, and the guide groove 108 is used to allow the biological strains to be thrown to the surroundings of the first cover 101;

[0070] In the above scheme, by providing the inclined discharge port 501, when biogas is injected, the biogas will not leak out from the discharge port 501, when the elemental sulfur or sulfate solution descends, it will not flow back from the first pipe 5, and through the spoiler 107 and the guide groove 108, the biological bacteria solution is evenly distributed inside the first cover 101, so that when the biological bacteria descends, it can be evenly mixed with the biogas, thereby improving the reaction efficiency of the bacteria and the biogas;

[0071] It should be noted that the rotation of the second blade 110 and the first blade 104 generates upward wind force, which can increase the lift of the biogas, thereby increasing the reaction rate of the biogas and the biological bacteria, and preventing the biogas from staying inside the cleaning tower 1 for a long time.

[0072] As a possible embodiment, a driving disk 111 is connected to the bottom of the driving shaft 103, a first protrusion 112 is connected around the driving disk 111, a driving ring 1096 is connected to the top of the filler 109, and a second protrusion 1097 is connected to the inner wall of the driving ring 1096. When the driving shaft 103 rotates to cause the first protrusion 112 to abut against the second protrusion 1097, the filler 109 slides in the direction of the second protrusion 1097. When the first protrusion 112 leaves the second protrusion 1097, under the action of the spring 13, the filler 109 returns to the middle position of the cleaning tower 1. The outer wall of the filler 109 is provided with a convex tooth 1094, and the inner wall of the cleaning tower 1 is connected with a paddle (not shown in the figure). When the filler 109 moves, the paddle abuts against the convex tooth 1094, causing the filler 109 to vibrate.

[0073] Embodiment 2: The technical solution of this embodiment is different from that of Embodiment 1 in that this embodiment provides a biogas purification and recycling process based on a sewage treatment plant, comprising the following steps:

[0074] S1, adding sodium hydroxide into the cleaning tower 1, injecting the biogas to be treated into the cleaning tower 1 from the first pipeline 5, and injecting the biological bacteria into the bioreactor 2;

[0075] S2, the biogas rises from the bottom of the cleaning tower 1 through the filler 109 to the top of the cleaning tower 1, and the biological bacteria in the bioreactor 2 are injected into the cleaning tower 1 from the fourth pipeline 8, and the biological bacteria come into contact with the biogas and react with the sulfur element in the biogas to generate elemental sulfur or sulfate solution, which falls to the bottom of the cleaning tower 1 and is transported to the bioreactor 2 through the second pipeline 6;

[0076] S3, the cleaned biogas is discharged from the top of the cleaning tower 1;

[0077] S4. The elemental sulfur or sulfate solution is transported to the interior of the gravity settler 3 for sedimentation, and the settled material is transported to a filter press or a centrifuge for dehydration to form a liquid suspension concentrate after dehydration.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A biogas purification and recycling device based on a sewage treatment plant, comprising a cleaning tower (1), a bioreactor (2) and a gravity settler (3), wherein one end of the cleaning tower (1) is connected to a first pipeline (5), characterized in that: A cleaning component is arranged inside the cleaning tower (1), and the cleaning component comprises: A first cover (101) is fixed to the inner wall of the cleaning tower (1) via a connecting block, a fourth pipe (8) is connected between the top of the first cover (101) and the top of the bioreactor (2), and a plurality of discharge holes (106) are provided at the bottom of the first cover (101); A filler (109) is installed in the middle of the cleaning tower (1), and a cavity is formed between its bottom and the inner bottom of the cleaning tower (1); a rising hole (1091) and fine holes (1092) are provided in the middle of the filler (109); a flat cavity (1098) is provided at the bottom of the filler (109); the rising hole (1091) and the fine holes (1092) both extend from the top of the filler (109) into the flat cavity (1098); and the rising hole (1091) is arranged in a spiral shape; A second cover (503), the second cover (503) being connected to one end of the first pipe (5) located inside the cleaning tower (1), and a plurality of air outlet holes (504) being formed on the top of the second cover (503); A drive shaft (103) is rotatably mounted in the middle of the first cover (101), and its bottom is connected to an extrusion structure, and the top of the filler (109) is connected to a pressure-bearing structure matching the extrusion structure, and when the drive shaft (103) rotates under the drive of an external force, the extrusion structure squeezes the pressure-bearing structure, thereby causing the filler (109) to move radially along the drive shaft (103); The left and right ends of the filler (109) are provided with first limit grooves (1093); the inner wall of the cleaning tower (1) is connected with a first limit block (11); a spring (13) is connected between the first limit groove (1093) and the first limit block (11); a second limit block (1095) is provided at the bottom of the filler (109); the inner wall of the cleaning tower (1) is provided with a second limit groove (12); the second limit block (1095) is slidably connected to the second limit groove (12); The bottom of the driving shaft (103) is connected to a driving disk (111), the periphery of the driving disk (111) is connected to a first protrusion (112), the top of the filler (109) is connected to a driving ring (1096), the inner wall of the driving ring (1096) is connected to a second protrusion (1097), and when the driving shaft (103) rotates to cause the first protrusion (112) to abut against the second protrusion (1097), the filler (109) moves toward the second protrusion (1097). The packing (109) slides in the direction of the protrusion (1097), and when the first protrusion (112) leaves the second protrusion (1097), under the action of the spring (13), the packing (109) returns to the middle position of the cleaning tower (1), the outer wall of the packing (109) is provided with a protruding tooth (1094), and the inner wall of the cleaning tower (1) is connected with a paddle, and when the packing (109) moves, the paddle and the protruding tooth (1094) abut against each other, causing the packing (109) to vibrate.

2. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: The bottom of the cleaning tower (1) is connected to a second pipeline (6), the middle of the second pipeline (6) is connected to a first pump (601), the other end of the second pipeline (6) is connected to the top of the bioreactor (2), a third pipeline (7) is connected between the bottom of the bioreactor (2) and the top of the gravity settler (3), the middle of the third pipeline (7) is connected to a second pump (701), the top of the bioreactor (2) is connected to an air inlet (201) and a feed inlet (202), a blower is installed at the top of the air inlet (201) for injecting air into the bioreactor (2), and the feed inlet (202) is used to add biological strains.

3. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: A filter cartridge (4) is installed at the bottom of the gravity settler (3), a motor (401) is installed at one end of the filter cartridge (4), a spiral blade is rotatably installed inside the filter cartridge (4), an output end of the motor (401) is fixedly connected to one end of the spiral blade, the motor (401) can drive the spiral blade to rotate inside the filter cartridge (4), one end of the filter cartridge (4) is connected to a discharge pipe (402), and the middle of the filter cartridge (4) is connected to a water outlet pipe (403), and the filter cartridge (4) is used for solid-liquid separation of sulfur sludge.

4. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: A frame (10) is arranged outside the cleaning tower (1), the bioreactor (2) and the gravity settler (3); the outer walls of the cleaning tower (1), the bioreactor (2) and the gravity settler (3) are fixedly connected to the inner wall of the frame (10).

5. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: An air outlet pipe (9) is fixedly connected to the top of the cleaning tower (1); one end of the air outlet pipe (9) located inside the cleaning tower (1) is connected to an air collecting hood (901); the top of the driving shaft (103) is connected to a first fan blade (104); when the driving shaft (103) rotates forward, the wind direction of the first fan blade (104) faces upward, and the wind force range of the first fan blade (104) is within the coverage range of the air collecting hood (901); and the middle of the fourth pipeline (8) is connected to a third pump (801) and a pressure gauge (802).

6. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: The top of the first cover (101) is connected to a rotating sleeve (102), one end of the driving shaft (103) is connected to a rotating block (113), the rotating block (113) is rotatably connected to the inner wall of the rotating sleeve (102), a spiral groove (105) is provided in the middle of the rotating block (113), the spiral groove (105) runs through the upper and lower ends of the rotating block (113), and the high-pressure liquid in the fourth pipe (8) impacts the spiral groove (105), thereby driving the rotating block (113) to rotate, thereby causing the driving shaft (103) to rotate in the forward direction.

7. The biogas purification and recycling device based on a sewage treatment plant as claimed in claim 1, characterized in that: A discharge port (501) is provided in the middle of the first pipe (5), the discharge port (501) is arranged at an angle, an inner wall of the discharge port (501) is connected to an inclined plate (502), a lower portion of the drive shaft (103) is connected to a second fan blade (110), when the drive shaft (103) rotates forward, the wind direction of the second fan blade (110) faces upward, a spoiler (107) and a guide groove (108) are connected to the middle of the drive shaft (103), the spoiler (107) and the guide groove (108) are located in the first cover (101), the spoiler (107) is used to allow the biological strains to be evenly distributed in the first cover (101), and the guide groove (108) is used to allow the biological strains to be thrown to the periphery of the first cover (101).

8. A purification process using a biogas purification and recycling device based on a sewage treatment plant according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, adding sodium hydroxide into the cleaning tower (1), injecting the biogas to be treated into the cleaning tower (1) from the first pipeline (5), and injecting the biological bacteria into the bioreactor (2); S2, the biogas rises from the bottom of the cleaning tower (1) through the filler (109) to the top of the cleaning tower (1), the biological bacteria in the bioreactor (2) are injected into the cleaning tower (1) from the fourth pipeline (8), the biological bacteria come into contact with the biogas, react with the sulfur element in the biogas, and generate elemental sulfur or sulfate solution, the solution falls to the bottom of the cleaning tower (1), and is transported to the bioreactor (2) through the second pipeline (6); S3, the cleaned biogas is discharged from the top of the cleaning tower (1); S4, elemental sulfur or sulfate solution is transported to the interior of the gravity settler (3) for sedimentation, and the settled material is transported to a filter press or a centrifuge for dehydration, and a liquid suspension concentrate is formed after dehydration.

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