CN113105997A - Anaerobic fermentation device capable of extracting biogas slurry - Google Patents
Anaerobic fermentation device capable of extracting biogas slurry Download PDFInfo
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- CN113105997A CN113105997A CN202110400716.0A CN202110400716A CN113105997A CN 113105997 A CN113105997 A CN 113105997A CN 202110400716 A CN202110400716 A CN 202110400716A CN 113105997 A CN113105997 A CN 113105997A
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Abstract
The invention provides an anaerobic fermentation device capable of extracting biogas slurry, which belongs to the technical field of anaerobic fermentation and comprises an anaerobic fermentation tank, a fixed pipe, a closing piece, a sliding pipe, a driving assembly and a liquid collecting box. The anaerobic fermentation tank is provided with a long hole. The fixed pipe is fixedly connected with the anaerobic fermentation tank, is provided with a biogas slurry extraction pump and has a first vertical section. The closing piece is arranged on the anaerobic fermentation tank in a sliding mode along the vertical direction and closes the strip-shaped hole. The sliding pipe is provided with a second vertical section, one section of the upper part of the second vertical section is slidably arranged in the first vertical section in a penetrating way, and the second vertical section is connected with the first vertical section in a sealing way. The driving assembly is used for driving the sliding pipe to slide. The liquid collecting box is fixedly connected with the closing piece, the bottom end of the liquid collecting box is communicated with the sliding pipe, and the upper end of the liquid collecting box is communicated with the inside of the anaerobic fermentation tank. The anaerobic fermentation device capable of extracting biogas slurry provided by the invention can solve the problem that the existing biogas slurry extraction device can only extract biogas slurry and can not control the amount of the extracted biogas slurry.
Description
Technical Field
The invention belongs to the technical field of anaerobic fermentation, and particularly relates to an anaerobic fermentation device capable of extracting biogas slurry.
Background
In large-scale cow breeding, excrement discharged by cows is collected by a scraper and then placed into an anaerobic fermentation tank for anaerobic fermentation to generate biogas. In the process, biogas slurry in the anaerobic fermentation tank is often required to be extracted for backflow or is used for farmlands after treatment. The existing biogas slurry extraction device can only extract biogas slurry, but cannot control the amount of the extracted biogas slurry, and the existing biogas slurry extraction device is not suitable for metering by using an electromagnetic flowmeter because a certain amount of biogas exists in the biogas slurry.
Disclosure of Invention
The invention aims to provide an anaerobic fermentation device capable of extracting biogas slurry, and aims to solve the problem that the conventional biogas slurry extraction device can only extract biogas slurry and cannot control the amount of the extracted biogas slurry.
In order to achieve the purpose, the invention adopts the technical scheme that: the anaerobic fermentation device capable of extracting biogas slurry comprises an anaerobic fermentation tank, wherein one side wall of the anaerobic fermentation tank is provided with a strip hole arranged in the vertical direction, and the anaerobic fermentation device capable of extracting biogas slurry further comprises a fixing pipe, a closing piece, a sliding pipe, a driving assembly and a liquid collecting box. The fixed pipe with anaerobic fermentation pond fixed connection is equipped with the natural pond liquid extraction pump, has first vertical section. The closing piece is arranged on the anaerobic fermentation tank in a sliding mode in the vertical direction and closes the strip-shaped hole. The sliding pipe is provided with a second vertical section, one section of the upper part of the second vertical section penetrates through the first vertical section in a sliding mode, and the second vertical section is connected with the first vertical section in a sealing mode. The driving assembly is arranged on the fixed pipe and connected with the sliding pipe and used for driving the sliding pipe to slide. The liquid collecting box is fixedly connected with the closing piece, the bottom end of the liquid collecting box is communicated with the sliding pipe, and the upper end of the liquid collecting box is communicated with the inside of the anaerobic fermentation tank.
As another embodiment of this application, the anaerobic fermentation pond is used for setting up the lateral wall embedding in rectangular hole is fixed with the stand, the upper and lower both ends of stand respectively with the roof and the diapire laminating of anaerobic fermentation pond are fixed, the stand is used for setting up rectangular hole.
As another embodiment of the present application, the elongated hole has a length equal to the upright post to divide the upright post into two divided portions.
As another embodiment of the present application, the closure includes a first slider and a second slider. First slider is located rectangular downthehole and seal rectangular hole has the first slide board portion of two vertical settings, two first slide board portion slides respectively and wears to locate two in the part portion, first slider can the lapse of lapse downwards the diapire in anaerobic fermentation pond, the upper end of first slider with liquid collection box fixed connection and be equipped with be used for with the intercommunicating pore of intercommunication in the anaerobic fermentation pond, the intercommunicating pore with liquid collection box intercommunication. The second slider is located rectangular downthehole and seal rectangular hole is located first slider orientation one side in the anaerobic fermentation pond has the second slide portion of two vertical settings, two the second slide portion slides respectively and wears to locate two in the branch portion, the second slider can upwards slide and pierce through the roof of anaerobic fermentation pond, works as the second slider upwards slides extremely the top of intercommunicating pore just the bottom of second slider is located when rectangular downthehole, the second slider can with first slider is connected.
As another embodiment of the present application, the first slider and the second slider are attached to each other.
As another embodiment of this application, the top surface of second slider extends to the top of anaerobic fermentation pond just is equipped with first screw hole, the cover is established and is fixed with first horizontal plate on the sliding tube, the top surface of first horizontal plate has set firmly the connecting axle of vertical setting, the top surface of connecting axle has set firmly and is located the second horizontal plate of second slider top, wear to be equipped with fastening bolt on the second horizontal plate, work as the second slider upwards slides extremely the top of intercommunicating pore just the bottom of second slider is located when rectangular is downthehole, fastening bolt's screw rod can penetrate first threaded hole in and with first screw hole threaded connection.
As another embodiment of the present application, the second horizontal plate is slidably sleeved on the first vertical section.
As another embodiment of this application, fixed pipe is gone up the cover and is established and be fixed with the third horizontal plate, the third horizontal plate is located first horizontal plate with between the second horizontal plate, the connecting axle is equipped with the external screw thread, drive assembly includes:
the driving ring is sleeved on the connecting shaft and is provided with a second threaded hole in threaded connection with the external thread, an annular groove coaxial with the second threaded hole is formed in the side face of the driving ring, and the annular groove is rotatably clamped in the third horizontal plate.
As another embodiment of this application, the lateral wall on vertical section top of second is equipped with outside convex sliding part, the vertical section cover of second establish be fixed with the sealing rubber circle of the laminating of the bottom surface of sliding part, the sliding part with the sealing rubber circle all with the inner wall laminating of first vertical section.
As another embodiment of this application, the rectangular downthehole filter screen that covers rectangular hole that sets firmly, the filter screen is located the second slider orientation one side in the anaerobic fermentation pond.
The anaerobic fermentation device capable of extracting biogas slurry provided by the invention has the beneficial effects that: compared with the prior art, the anaerobic fermentation device capable of extracting biogas slurry calculates the height of the liquid level of the biogas slurry in the anaerobic fermentation tank to be reduced according to the amount of the biogas slurry to be extracted and the liquid level of the biogas slurry in the anaerobic fermentation tank, the driving assembly drives the sliding pipe to slide downwards, the sliding pipe drives the closing piece to slide downwards through the liquid collecting box, when the sliding pipe slides downwards to a proper position, the biogas slurry to be extracted in the anaerobic fermentation tank can flow into the liquid collecting box, and meanwhile, the biogas slurry in the liquid collecting box is extracted by the biogas slurry extracting pump, so that the problem that the conventional biogas slurry extracting device can only extract biogas slurry and cannot control the amount of the extracted biogas slurry can be solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic axial view of an anaerobic fermentation device capable of extracting biogas slurry according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a portion A of FIG. 1;
fig. 3 is a schematic sectional structural view of a front view of an anaerobic fermentation device capable of extracting biogas slurry according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of a portion B of FIG. 3;
FIG. 5 is an enlarged schematic view of a portion C of FIG. 3;
fig. 6 is a schematic partial top sectional structure view of an anaerobic fermentation device capable of extracting biogas slurry according to an embodiment of the present invention.
In the figure: 1. an anaerobic fermentation tank; 111. a strip hole; 112. a separation part; 1121. a sealing strip; 12. a chute; 2. a fixed tube; 21. a biogas slurry extraction pump; 22. a first vertical section; 3. a closure; 31. a first slider; 311. a first slide plate portion; 312. a communicating hole; 32. a second slider; 321. a second slide plate portion; 322. a first threaded hole; 323. a drive aperture; 4. a sliding tube; 41. a second vertical section; 411. a sliding part; 412. sealing the rubber ring; 5. a drive assembly; 51. a drive ring; 52. a gear; 53. a drive motor; 6. a liquid collection tank; 7. a first horizontal plate; 8. a connecting shaft; 9. a second horizontal plate; 110. fastening a bolt; 120. a third horizontal plate; 130. and (5) filtering by using a filter screen.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 3 together, an anaerobic fermentation apparatus capable of extracting biogas slurry according to the present invention will now be described. The anaerobic fermentation device capable of extracting biogas slurry comprises an anaerobic fermentation tank 1, wherein one side wall of the anaerobic fermentation tank 1 is provided with a strip hole 111 arranged in the vertical direction, and the anaerobic fermentation device capable of extracting biogas slurry further comprises a fixed pipe 2, a closing piece 3, a sliding pipe 4, a driving assembly 5 and a liquid collecting box 6. The fixed pipe 2 is fixedly connected with the anaerobic fermentation tank 1, is provided with a biogas slurry extraction pump 21 and is provided with a first vertical section 22. The closing piece 3 is arranged on the anaerobic fermentation tank 1 in a sliding mode along the vertical direction and closes the long hole 111. The sliding tube 4 has a second vertical section 41, a section of the upper portion of the second vertical section 41 is slidably disposed in the first vertical section 22, and the second vertical section 41 is hermetically connected to the first vertical section 22. The driving assembly 5 is arranged on the fixed pipe 2 and connected with the sliding pipe 4, and is used for driving the sliding pipe 4 to slide. The liquid collecting box 6 is fixedly connected with the closing piece 3, the bottom end of the liquid collecting box is communicated with the sliding pipe 4, and the upper end of the liquid collecting box is communicated with the interior of the anaerobic fermentation tank 1.
Compared with the prior art, the anaerobic fermentation device capable of extracting biogas slurry provided by the invention has the advantages that the height of the liquid level of the biogas slurry in the anaerobic fermentation tank 1 to be reduced is calculated according to the amount of the biogas slurry to be extracted and the liquid level height of the biogas slurry in the anaerobic fermentation tank 1, the driving component 5 drives the sliding pipe 4 to slide downwards, the sliding pipe 4 drives the closing piece 3 to slide downwards through the liquid collection box 6, when the sliding pipe 4 slides downwards to a proper position, the biogas slurry to be extracted in the anaerobic fermentation tank 1 can flow into the liquid collection box 6, and meanwhile, the biogas slurry in the liquid collection box 6 is extracted by the biogas slurry extraction pump 21, so that the problem that the conventional biogas slurry extraction device can only extract biogas slurry and cannot control the amount of the extracted biogas slurry can be solved.
In this embodiment, the fixed pipe 2 may further be provided with a gas-liquid separation device, so as to separate biogas contained in the biogas slurry.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry provided by the present invention, please refer to fig. 1, the liquid collection box 6 is made of transparent material, so that the extraction condition of biogas slurry can be conveniently observed.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry according to the present invention, referring to fig. 2 and 6, an upright is embedded and fixed on a side wall of the anaerobic fermentation tank 1 for installing the elongated hole 111, an upper end and a lower end of the upright are respectively attached and fixed to a top wall and a bottom wall of the anaerobic fermentation tank 1, and the upright is used for installing the elongated hole 111, such that strength of the side wall of the anaerobic fermentation tank 1 for installing the elongated hole 111 can be increased.
Referring to fig. 2 and 6, as a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry according to the present invention, a long hole 111 is as long as a vertical column to divide the vertical column into two split portions 112, so that the device can extract biogas slurry to the maximum.
Referring to fig. 3 and 6, as one embodiment of the anaerobic fermentation device capable of extracting biogas slurry provided by the present invention, the closing member 3 includes a first slider 31 and a second slider 32. The first slide block 31 is located in the elongated hole 111 and closes the elongated hole 111, and has two vertically arranged first slide plate portions 311, the two first slide plate portions 311 are respectively slidably arranged in the two split portions 112, the first slide block 31 can slide downwards to penetrate through the bottom wall of the anaerobic fermentation tank 1, the upper end of the first slide block 31 is fixedly connected with the liquid collection tank 6 and is provided with a communication hole 312 for communicating with the interior of the anaerobic fermentation tank 1, and the communication hole 312 is communicated with the liquid collection tank 6. The second slider 32 is located the rectangular hole 111 and seals rectangular hole 111, is located one side of first slider 31 in towards anaerobic fermentation tank 1, has two vertical second slide plate portions 321 that set up, and two second slide plate portions 321 slide respectively and wear to locate in two parts portion 112, and the second slider 32 can upwards slide and pierce through the roof of anaerobic fermentation tank 1, and when the second slider 32 upwards slides to the top of intercommunicating pore 312 and the bottom of second slider 32 is located rectangular hole 111, the second slider 32 can be connected with first slider 31. When the biogas slurry does not need to be extracted, the second sliding block 32 seals the long hole 111, so that the biogas in the anaerobic fermentation tank 1 can be prevented from escaping through the communication hole 312; when biogas slurry is to be extracted, the second slide block 32 slides upwards to the upper part of the communication hole 312, the second slide block 32 is connected with the first slide block 31, the bottom end of the second slide block 32 is still positioned in the long hole 111, then the driving assembly 5 drives the slide pipe 4 to slide downwards, the slide pipe 4 drives the first slide block 31 and the second slide block 32 connected with the first slide block 31 to simultaneously slide downwards through the liquid collection box 6, and thus the first slide block 31 and the second slide block 32 can always seal the long hole 111, so that biogas in the anaerobic fermentation tank 1 is prevented from escaping from the long hole 111.
In this embodiment, two elongated sealing strips 1121 may be embedded and fixed in the side surface of the split portion 112 facing the elongated hole 111, the sealing strips 1121 penetrate through the split portion 112 in the vertical direction, and the first sliding plate portion 311 and the second sliding plate portion 321 on the same side are respectively slidably inserted into the two sealing strips 1121 on the same side, so that the sealing performance between the first slider 31 and the split portion 112 and the second slider 32 is ensured.
In this embodiment, a chute 12, which is fixedly connected to the anaerobic fermentation tank 1 and vertically disposed, may be further disposed below the anaerobic fermentation tank 1, and the first sliding block 31 can slide and penetrate into the chute 12 after sliding downward to penetrate through the bottom wall of the anaerobic fermentation tank 1.
Referring to fig. 6, a first slide block 31 and a second slide block 32 are attached to each other as a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry according to the present invention. After the first slider 31 and the second slider 32 are reset, residual biogas slurry between the first slider 31 and the second slider 32 can be prevented.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry provided by the present invention, referring to fig. 1 to 2, the top surface of the second slider 32 extends to the upper side of the anaerobic fermentation tank 1 and is provided with a first threaded hole 322, the sliding tube 4 is fixedly sleeved with a first horizontal plate 7, the top surface of the first horizontal plate 7 is fixedly provided with a vertically arranged connecting shaft 8, the top surface of the connecting shaft 8 is fixedly provided with a second horizontal plate 9 positioned above the second slider 32, the second horizontal plate 9 is provided with a fastening bolt 110 in a penetrating manner, when the second slider 32 slides upwards to the upper side of the communicating hole 312 and the bottom end of the second slider 32 is positioned in the elongated hole 111, the screw of the fastening bolt 110 can penetrate into the first threaded hole 322 and is in threaded connection with the connecting shaft 322, the connection of the first slider 31 and the second slider 32 is realized by the sliding tube 4, the liquid collection tank 6, the first horizontal plates 7, 8, the second horizontal plate 9 and the fastening bolt 110, meanwhile, the second horizontal plate 9 can limit the second sliding block 32 when the second sliding block 32 slides upwards.
In the present embodiment, the first screw hole 322 and the fastening bolt 110 may be provided in a plurality of sets.
Referring to fig. 2 and 4, as a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry according to the present invention, a driving hole 323 is formed at one end of the second slider 32 exposed from the top wall of the anaerobic fermentation tank 1, the driving hole 323 is horizontally disposed, and a hand can be inserted into the driving hole 323 to conveniently drive the second slider 32 to slide upward.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry provided by the present invention, please refer to fig. 1, the second horizontal plate 9 is slidably sleeved on the first vertical section 22, so as to prevent the connecting shaft 8 from bending.
Referring to fig. 1, 2 and 4, a third horizontal plate 120 is fixedly sleeved on the fixed pipe 2, the third horizontal plate 120 is located between the first horizontal plate 7 and the second horizontal plate 9, the connecting shaft 8 is provided with an external thread, and the driving assembly 5 includes a driving ring 51. The driving ring 51 is sleeved on the connecting shaft 8 and is provided with a second threaded hole in threaded connection with the external thread, the side surface of the driving ring is provided with an annular groove coaxial with the second threaded hole, and the annular groove is rotatably clamped in the third horizontal plate 120. Since the connecting shaft 8 cannot rotate, the rotating driving ring 51 can realize the movement of the connecting shaft 8 in the vertical direction, so as to realize the sliding of the driving sliding pipe 4 in the vertical direction, and meanwhile, the arrangement of the third horizontal plate 120 and the driving ring 51 can further avoid the bending of the connecting shaft 8. In this embodiment, the driving assembly 5 further comprises a driving motor 53 and two meshed gears 52, the driving motor 53 is fixed on the third horizontal plate 120, and the two meshed gears 52 are fixed on the driving ring 51 and the output shaft of the driving motor 53, respectively. The drive motor 53 rotates the drive ring 51 via two meshed gears 52.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry provided by the present invention, please refer to fig. 5, a sliding portion 411 protruding outward is disposed on a side wall of a top end of the second vertical section 41, a sealing rubber ring 412 attached to a bottom surface of the sliding portion 411 is fixedly sleeved on the second vertical section 41, and both the sliding portion 411 and the sealing rubber ring 412 are attached to an inner wall of the first vertical section 22. This ensures a sealed connection between the first vertical section 22 and the second vertical section 41, and the second vertical section 41 has less friction when sliding in the vertical direction.
As a specific embodiment of the anaerobic fermentation device capable of extracting biogas slurry according to the present invention, please refer to fig. 6, a filter screen 130 covering the elongated hole 111 is fixedly disposed in the elongated hole 111, the filter screen 130 is disposed on a side of the second slider 32 facing the anaerobic fermentation tank 1, and when the biogas slurry is extracted by the biogas slurry extraction pump 21, the separation of biogas slurry and biogas residue can be achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Anaerobic fermentation device that can extract natural pond liquid, including anaerobic fermentation pond, its characterized in that, one of them lateral wall of anaerobic fermentation pond is equipped with the rectangular hole that sets up along vertical direction, anaerobic fermentation device that can extract natural pond liquid still includes:
the fixed pipe is fixedly arranged opposite to the anaerobic fermentation tank, is provided with a biogas slurry extraction pump and is provided with a first vertical section;
the closing piece is arranged on the anaerobic fermentation tank in a sliding mode along the vertical direction and closes the long hole;
the sliding pipe is provided with a second vertical section, one section of the upper part of the second vertical section is slidably arranged in the first vertical section in a penetrating way, and the second vertical section is connected with the first vertical section in a sealing way;
the driving assembly is arranged on the fixed pipe, connected with the sliding pipe and used for driving the sliding pipe to slide; and
and the liquid collecting box is fixedly connected with the closing piece, the bottom end of the liquid collecting box is communicated with the sliding pipe, and the upper end of the liquid collecting box is communicated with the inside of the anaerobic fermentation tank.
2. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 1, wherein the side wall of the anaerobic fermentation tank for arranging the elongated hole is embedded and fixed with a stand column, the upper end and the lower end of the stand column are respectively attached and fixed with the top wall and the bottom wall of the anaerobic fermentation tank, and the stand column is used for arranging the elongated hole.
3. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 2, wherein the elongated hole is as long as the upright column to divide the upright column into two divided parts.
4. An anaerobic fermentation device capable of extracting biogas slurry according to claim 3, wherein the closure member comprises:
the first sliding block is positioned in the long strip hole, closes the long strip hole, and is provided with two vertically arranged first sliding plate parts, the two first sliding plate parts are respectively penetrated into the two split parts in a sliding manner, the first sliding block can downwards slide to penetrate through the bottom wall of the anaerobic fermentation tank, the upper end of the first sliding block is fixedly connected with the liquid collecting tank and is provided with a communication hole communicated with the anaerobic fermentation tank, and the communication hole is communicated with the liquid collecting tank;
the second slider is located rectangular downthehole and seal rectangular hole is located first slider orientation one side in the anaerobic fermentation pond has the second slide board portion of two vertical settings, two the second slide board portion slides respectively and wears to locate two in the branch portion, the second slider can upwards slide and pierce through the roof of anaerobic fermentation pond, works as the second slider upwards slides extremely the top of intercommunicating pore just the bottom of second slider is located when rectangular downthehole, the second slider can with first slider is connected.
5. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 4, wherein the first slider and the second slider are attached.
6. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 4, wherein the top surface of the second slider extends to the top of the anaerobic fermentation tank and is provided with a first threaded hole, the sliding tube is sleeved and fixed with a first horizontal plate, the top surface of the first horizontal plate is fixedly provided with a vertically arranged connecting shaft, the top surface of the connecting shaft is fixedly provided with a second horizontal plate located above the second slider, the second horizontal plate is provided with a fastening bolt in a penetrating manner, and when the second slider slides upwards to the upper part of the communicating hole and the bottom end of the second slider is located in the long-strip hole, the screw rod of the fastening bolt can penetrate into the first threaded hole and is in threaded connection with the first threaded hole.
7. The anaerobic fermentation device capable of extracting biogas slurry of claim 6, wherein the second horizontal plate is slidably sleeved on the first vertical section.
8. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 6, wherein a third horizontal plate is fixedly sleeved on the fixing pipe, the third horizontal plate is located between the first horizontal plate and the second horizontal plate, the connecting shaft is provided with an external thread, and the driving assembly comprises:
the driving ring is sleeved on the connecting shaft and is provided with a second threaded hole in threaded connection with the external thread, an annular groove coaxial with the second threaded hole is formed in the side face of the driving ring, and the annular groove is rotatably clamped in the third horizontal plate.
9. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 1, wherein a sliding part protruding outwards is arranged on the side wall of the top end of the second vertical section, a sealing rubber ring attached to the bottom surface of the sliding part is fixedly sleeved on the second vertical section, and the sliding part and the sealing rubber ring are both attached to the inner wall of the first vertical section.
10. The anaerobic fermentation device capable of extracting biogas slurry as claimed in claim 4, wherein a filter screen covering the elongated hole is fixedly arranged in the elongated hole, and the filter screen is positioned on one side of the second sliding block facing the anaerobic fermentation tank.
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| US20100285556A1 (en) * | 2007-06-27 | 2010-11-11 | Michael Feldmann | Biogas plant and process for the production of biogas from ligneous renewable resources |
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