Integrated dry anaerobic fermentation device for continuous treatment of agricultural waste

Abstract

The present invention discloses an integrated dry anaerobic fermentation device for continuously treating agricultural waste, comprising: a feeding unit, a fermentation unit, and a discharging unit. The feeding unit comprises: a feeding bin and a feeding mechanism. The feeding bin is provided with a feeding section and a feeding section. The discharging port of the feeding section extends to the bottom of the feeding bin. The height of the feeding port of the feeding section is higher than the height of the discharging port of the feeding section. The feeding mechanism is arranged in the feeding bin; the fermentation unit comprises: an outer shell, an inner shell, a push plate, a scraper, and a driving mechanism. The inner shell is arranged inside the outer shell along its own axis, and the push plates are arranged in a plurality of pieces and are arranged in sequence along the axis of the inner shell, and are arranged spirally around the inner wall of the inner shell. The scraper is arranged in the inner shell, and the driving mechanism contacts the inner shell. The height difference design between the feeding section and the feeding section can realize the liquid sealing function in the feeding bin; the inner shell that can rotate along the axis is designed so that the material can roll in the inner shell, and the material accumulated in the middle can be exposed to the fermentation environment.

Description

Technical Field

[0001] The invention relates to the technical field of fermentation equipment, and in particular to equipment for co-producing gas and fertilizer by utilizing biomass such as excrement and straw. Background Art

[0002] my country is a large agricultural country, and rural areas bear the heavy responsibility of building an ecological civilization. In the past few years, various engineering and product-based means such as manure treatment and disposal centers, centralized straw utilization, rural sewage treatment, and promotion of organic fertilizers have played a good demonstration role. However, so far, due to the radiation range and economic applicability of engineering projects, their promotion speed is still relatively slow.

[0003] At the same time, with the continuous improvement of people's living standards and the improvement of rural economy and energy supply, farmers' burning of straw has been greatly reduced, and the remaining agricultural waste has accumulated more and more. Coupled with the needs of new rural construction, rural ecology and farmers' employment will face tremendous pressure for a long time in the future.

[0004] Straw and manure contain huge amounts of biomass energy. Their resource utilization has great potential for saving energy and cultivating soil fertility. It is of great significance to the construction of new countryside and solving the last mile of "ecological countryside".

[0005] The existing technologies in agriculture and animal husbandry are mostly aerobic production of organic fertilizers, septic tanks, and relatively centralized manure treatment centers. These technologies often have one or more defects such as high operating costs, difficulty in input and output of materials, and high transportation costs, making them difficult to promote in practice.

[0006] To solve the above problems, the prior art discloses the following related patents, whose application numbers are 201921784810 or 202011275453 or 202210125573 or 201810404060 or 202011521250. These technologies disclose one or more of the zero emission technology, heat exchange technology, biological fermentation technology, stirring technology, and spraying technology applied to dry fermentation in different directions and to different degrees.

[0007] However, the above disclosed technologies are mostly carried out in a batch mode, and the product quality and quantity are unstable, which is not conducive to popularization and application. In specific practice, the feasibility of intensive, device-based and human-machine linkage of dry fermentation systems has not been fully considered. Summary of the invention

[0008] The embodiment of the present application provides an integrated dry anaerobic fermentation device for continuously treating agricultural waste, which is used to realize the continuous operation mode of the fermentation equipment, and concentrates the feeding, fermentation and discharging on the same equipment, thereby improving the overall intensiveness and device level of the equipment.

[0009] The embodiment of the present application provides an integrated dry anaerobic fermentation device for continuously treating agricultural waste, comprising:

[0010] Feed unit, comprising:

[0011] A feed bin, wherein the feed bin is provided with a feed section and a feeding section, the discharge port of the feed section extends to the bottom of the feed bin, and the height of the feed port of the feeding section is higher than the height of the discharge port of the feed section;

[0012] A feeding mechanism, which is arranged in the feeding bin and is used to transport materials to the feeding port of the feeding section;

[0013] Fermentation unit, including:

[0014] A housing connected to the feed bin;

[0015] An inner shell, the inner shell being rotatably disposed inside the outer shell along its own axis;

[0016] A push plate, wherein the push plates are provided in a plurality of pieces and are arranged in sequence and spaced apart along the axis of the inner shell, and are arranged spirally around the inner wall of the inner shell;

[0017] A scraper, the scraper is arranged in the inner shell, and the scraper is used to scrape the material adhered to the inner wall of the inner shell;

[0018] a driving mechanism, the driving mechanism being in contact with the inner shell and being used to drive the inner shell to rotate;

[0019] Discharging unit, including:

[0020] A discharge bin is connected to the other end of the outer shell relative to the feed bin, and the discharge bin has an exhaust port and a discharge port communicated with the inner shell.

[0021] The beneficial effects of the above embodiments are as follows: by designing the height difference between the feed section and the feeding section, a liquid sealing function can be achieved in the feed bin, thereby reducing the probability of biogas leakage; by feeding the material between the feed section and the feeding section through the feeding mechanism, the function of continuous or intermittent feeding can be achieved according to the fermentation requirements; by designing an inner shell that can rotate along the axis, the material can tumble in the inner shell, and during the turning process, the material in the middle is turned out and exposed to the fermentation environment, thereby ensuring the uniformity of the material fermentation.

[0022] Based on the above embodiments, the embodiments of the present application may also be improved as follows:

[0023] In one of the embodiments of the present application: the feeding mechanism is a bucket elevator, and the bucket elevator is vertically arranged in the feed bin.

[0024] In one embodiment of the present application: the inner shell is tilted so that the end of the inner shell near the discharge bin is higher than the end of the inner shell near the feed bin. The beneficial effect of this step: the tilted design structure allows a certain amount of liquid to be retained at a lower position in the inner shell, thereby facilitating the fermentation of the material.

[0025] In one embodiment of the present application: the fermentation unit further includes: a reflux groove, the reflux groove is connected to the lower end of the inner shell located at one end of the discharge bin, and the reflux groove is used to receive the liquid overflowing from the inner shell at the end of the side; a reflux pipe, one end of the reflux pipe is connected to the reflux groove, and the other end is connected to the feed bin. The beneficial effect of this step: the excess liquid can be refluxed to the feed bin through the reflux groove, thereby replenishing the liquid in the feed bin.

[0026] In one embodiment of the present application: the fermentation unit further comprises: a spray pipe, the spray pipe is arranged in the inner shell along the length direction of the inner shell, and a plurality of spray ports are sequentially opened at the lower end of the spray pipe along the length direction. The beneficial effect of this step: liquid is added to the material in the inner shell through the spray pipe to ensure the wetness of the fermentation environment.

[0027] In one embodiment of the present application: the driving mechanism includes: a guide rail, which is an annular structure sleeved on the outer side of the inner shell; a roller, which is rotatably arranged under the guide rail and in contact with the guide rail; and a driving member, which is connected to the roller and used to drive the roller to rotate. Beneficial effect of this step: the inner shell is driven to rotate by the cooperation between the roller and the guide rail.

[0028] In one of the embodiments of the present application: the discharging unit further includes: a solid-liquid separation mechanism, and the feed port of the solid-liquid separation mechanism is located below the discharge port.

[0029] In one embodiment of the present application: the fermentation unit further comprises: a heating mechanism, the heating mechanism is arranged between the outer shell and the inner shell, and the heating mechanism is used to heat the material in the inner shell. The beneficial effect of this step: the fermentation temperature of the material in the inner shell is maintained by the heating mechanism.

[0030] In one embodiment of the present application: the inner side of the shell has a heat preservation layer. The beneficial effect of this step: the heat loss of the fermentation environment is reduced by the heat preservation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0032] Figure 1 It is a structural schematic diagram of a specific embodiment;

[0033] Figure 2 This is an enlarged view of the structure at the connection between the inner shell and the outer shell.

[0034] Among them, 1 is a feeding unit, 101 is a feeding bin, 102 is a feeding mechanism, 103 is a feeding section, and 104 is a feeding section;

[0035] 2 fermentation unit, 201 outer shell, 202 inner shell, 203 push plate, 204 scraper, 205 driving mechanism, 206 bearing, 207 sealing ring, 208 reflux groove, 209 reflux pipe, 210 filter screen, 211 spray pipe, 212 bracket, 213 fixed shaft, 214 guide rail, 215 roller, 216 driving member;

[0036] 3 discharging unit, 301 discharging bin, 302 exhaust port, 303 discharging port, 304 guide plate, 305 solid-liquid separation mechanism. DETAILED DESCRIPTION

[0037] In this application, unless otherwise clearly specified and limited, terms such as installation, connection, connection, fixing, and affixing should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, and the mechanical connection method can be selected from the existing technology in a suitable connection method, such as welding, riveting, threaded connection, bonding, pin connection, key connection, elastic deformation connection, snap connection, interference connection, and injection molding to achieve structural connection; it can also be an electrical connection, through which energy or signals are transmitted; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiments

[0039] like Figure 1As shown, an integrated dry anaerobic fermentation device for continuously treating agricultural waste includes: a feeding unit 1, a fermentation unit 2, and a discharging unit 3. The feeding unit 1 is located on the left side of the fermentation unit 2, and the discharging unit 3 is located on the right side of the fermentation unit 2. The feeding unit 1, the fermentation unit 2 and the discharging unit 3 are sequentially interconnected to form an integral structure. The feeding unit 1 is used for introducing biomass materials such as straw and feces, the fermentation unit 2 is used for fermenting the materials, and the discharging unit is used for classifying and discharging the fermented gas, liquid and solid.

[0040] like Figure 1 As shown, the feeding unit 1 includes: a feeding bin 101 and a feeding mechanism 102. A feeding section 103 connected to the outside is arranged on the left side of the feeding bin 101, and a feeding section 104 connected to the fermentation unit 2 is arranged on the right side. The feed port of the feeding section 103 is connected to the external environment, and the discharge port of the feeding section 103 extends into the interior of the feeding bin 101 and extends downward to the bottom of the feeding bin 101. The feed port of the feeding section 104 is located at the upper end of the interior of the feeding bin 101 and the height of the feed port is higher than the height of the discharge port of the feeding section 103. The purpose of such a setting is to form a height difference between the discharge port of the feeding section 103 and the feed port of the feeding section 104, so that liquid can be passed into the feeding bin 101, and a liquid seal structure is formed in the feeding bin 101 by the liquid, which greatly reduces the leakage of biogas from the fermentation unit 2, and the liquid can humidify the material put therein, so as to facilitate the subsequent material fermentation work.

[0041] like Figure 1 As shown, the feeding mechanism 102 is arranged in the feeding bin 101 and is used to transport the material to the feeding port of the feeding section 104. The feeding mechanism 102 is a bucket elevator, which is vertically arranged in the feeding bin 101. The bucket elevator lifts the material on the left side and transports it to the right side. The material is thrown out and falls on the right side, thereby entering the feeding port of the feeding section 104, and then slides into the fermentation unit 2 from the feeding port.

[0042] like Figure 1 , 2 As shown, the fermentation unit 2 includes: an outer shell 201, an inner shell 202, a push plate 203, a scraper 204, and a driving mechanism 205. The outer shell 201 is connected to the feed bin 101, and the inner shell 202 is rotatably arranged inside the outer shell 201 along its own axis. There are multiple push plates 203 and they are arranged in sequence along the axis of the inner shell 202 and are spirally arranged around the inner wall of the inner shell 202. The scraper 204 is arranged in the inner shell 202. The scraper 204 is used to scrape off the material adhered to the inner wall of the inner shell 202. The driving mechanism 205 is in contact with the inner shell 202 and is used to drive the inner shell 202 to rotate.

[0043] like Figure 1As shown, the housing 201 is arranged transversely and respectively connected to the feed unit 1 and the discharge unit 3 on both sides, and specifically adopts a sealed connection method, such as direct full welding connection, or bolt connection with a sealing gasket at the connection position.

[0044] like Figure 1 , 2 As shown, the inner shell 202 is a cylindrical structure with one end open, and the open end is located on one side of the discharge unit 3. There is a gap between the outer wall of the inner shell 202 and the inner wall of the outer shell 201 and they are connected to the feed bin 101 along the transverse rotation. Specifically, a bearing 206 can be used for connection, such as a pipeline bearing. When a pipeline bearing is used, the inner ring of the pipeline bearing is fixedly connected to the feed bin 101, and the outer ring end face of the pipeline bearing is connected to the closed end of the inner shell 202. A through hole is opened at the closed end corresponding to the protruding part of the inner ring, and a sealing ring 207 is arranged between the through hole and the protruding part. The feeding section 104 passes through the two through holes and then extends obliquely into the inner shell 202.

[0045] like Figure 1 As shown, the inner shell 202 is tilted so that the end of the inner shell 202 close to the discharge bin 301 is higher than the end of the inner shell 202 close to the feed bin 101, so that a certain amount of liquid can be maintained in the lower part of the inner shell 202, thereby facilitating the fermentation operation.

[0046] like Figure 1 As shown, the fermentation unit 2 also includes: a reflux groove 208, a reflux pipe 209, and a filter screen 210. The reflux groove 208 is connected to the lower end of the inner shell 202 located at one end of the discharge bin 301. The reflux groove 208 is used to receive the liquid overflowing from the inner shell 202 at this end. An overflow hole connected to the reflux groove 208 is opened at the front end of the inner shell 202 corresponding to the position of the reflux groove 208. A filter screen 210 is arranged at the overflow hole. The filter screen 210 is used to reduce the probability of impurities entering the reflux groove 208. The fermentation liquid can enter the reflux groove 208 through the overflow hole. One end of the reflux pipe 209 is connected to the reflux groove 208, and the diameter of the reflux pipe 209 should be larger than the filter screen. The aperture of the mesh hole 210 is large, so that the impurities passing through the filter mesh 210 will not block the filter tube after entering the return pipe 209. The other end of the return pipe 209 is connected to the feed bin 101. The return pipe 209 has an overall bending structure. The tube body connected to the reflux groove 208 is vertically arranged and connected to the bottom of the reflux groove 208. The tube body connected to the reflux groove 208 extends to the outside of the lower end of the shell and then bends toward the feed bin 101. There is an angle between the bending structure and the horizontal plane. The angle allows the liquid in the pipeline to flow to the feed bin 101 by gravity. The return pipe 209 extends into the feed bin 101, thereby introducing the liquid into the feed bin 101.

[0047] like Figure 1As shown, the fermentation unit 2 also includes: a spray pipe 211, which is arranged at the upper end position of the inner shell 202 along the length direction of the inner shell 202, one end of the spray pipe 211 is connected to the bracket 212 connected to the inner ring of the pipeline bearing, and the other end is fixed to the discharge unit 3 and extends to the outside of the discharge unit 3. A plurality of spray ports are sequentially opened at the lower end of the spray pipe 211 along the length direction, and the spray pipe 211 is used to add liquid to the inner shell 202, so that the material in the inner shell 202 is in a moist fermentation environment.

[0048] like Figure 2 As shown, the fermentation unit 2 also includes: a fixed shaft 213, the fixed shaft 213 is arranged at the upper end of the inner shell 202, one end of the fixed shaft 213 is connected to the bracket 212, and the other end is connected to the discharging unit 3, the scrapers 204 are arranged at intervals and connected to the fixed shaft 213 in sequence, the blades of the scrapers 204 are arranged toward the inner wall of the upper end of the inner shell 202 and there is a gap between the scrapers 204 and the vertical plane, and the angle a is the angle between the surface of the scraper 204 away from the material and the vertical plane, and the angle a is less than 90°. The angle a enables the scraper 204 to guide the incoming material, so that the material The material can slide along the surface of the scraper 204 toward the push plate 203 on the other side. The lower end of the scraper 204 is bent toward the side where the material comes from. The curvature has a guiding effect on the material, reducing the probability of the material falling directly after hitting the scraper 204. Because if the material falls directly, it may fall into the area between the two push plates 203, increasing the difficulty of the material moving toward the push plate 203 on the other side. The curvature is set so that the material will be guided by the lower end of the scraper 204 during the falling process, so that the material moves in a certain scattered state toward the push plate 203 on the other side, thereby facilitating the material to move toward the push plate 203 on the other side.

[0049] The fermentation unit 2 also includes: a heating mechanism, which is arranged between the outer shell 201 and the inner shell 202. The heating mechanism is used to heat the material in the inner shell 202. The heating mechanism can specifically adopt electric heating wires, electric heating rods and other mechanisms. The heating mechanism is arranged in the space between the inner shell 202 and the outer shell 201. The inner side of the outer shell 201 also has an insulation layer. The insulation layer is used to reduce heat loss, so that the fermentation unit 2 can maintain a sufficient fermentation temperature. The insulation layer is composed of insulation material laid on the inner side of the outer shell 201.

[0050] like Figure 1As shown, the driving mechanism 205 includes: a guide rail 214, a roller 215, and a driving member 216. The guide rail 214 is an annular structure sleeved on the outside of the inner shell 202. There are several guide rails 214 and they are arranged in sequence along the length direction of the inner shell 202. A strip hole is opened at the lower end of the outer shell 201 corresponding to the guide rail 214. The lower end of the guide rail 214 extends to the outside of the outer shell 201 and contacts with the roller 215 arranged below. There is a gap between the hole wall of the strip hole and the outer wall of the guide rail 214. The hole wall is opened with a groove surrounding the lower end of the guide rail 214. The groove is filled with sealing materials, such as felt strips, sealing strips and other materials. There are two grooves from top to bottom, the upper one is filled with a sealing strip, and the lower one is filled with a felt strip The sealing strip is mainly used for sealing gas and liquid, and the felt strip is mainly used for heat insulation. Through the cooperation of the sealing strip and the felt strip, the functions of sealing and heat insulation are realized at the same time, reducing the leakage of biogas, biogas liquid and heat; the roller 215 is connected to the support, and a protective cover connected to the outer shell 201 is arranged on the outside of the support. Through the cooperation of the protective cover and the outer shell 201, the strip-shaped holes are sealed inside, thereby further reducing the leakage of biogas, biogas liquid and heat. The driving member 216 is connected to one of the rollers 215 and is used to drive the roller 215 to rotate. The driving member 216 adopts a motor, which drives the roller 215 to rotate through the motor, thereby driving the inner shell 202 to rotate, and the roller 215 also plays a supporting role.

[0051] like Figure 1 As shown, the discharging unit 3 includes: a discharging bin 301, which is connected to the other end of the outer shell 201 relative to the feeding bin 101, and the discharging bin 301 has an exhaust port 302 and a discharge port 303 which are connected to the inner shell 202, the exhaust port 302 is located at the upper end of the discharging bin 301, and the discharge port 303 is located at the lower end of the discharging bin 301, and a guide plate 304 extends upward from the discharge port 303, and the guide plate 304 extends to the bottom of the end of the inner shell 202, and the guide plate 304 guides the fermented material into the discharge port 303.

[0052] like Figure 1 As shown, the discharging unit 3 also includes: a solid-liquid separation mechanism 305, the feed port of the solid-liquid separation mechanism 305 is located below the discharge port 303. Specifically, the solid-liquid separation mechanism 305 adopts a screw extruder, and the fermented material is dehydrated by the screw extruder, so that the liquid in the material is separated, and the separated liquid can be further introduced into the fermentation tank, so that the separated fermentation liquid can be used as a supplementary liquid to supply liquid to the spray pipe 211 and the feed bin 101.

[0053] The working mode of this integrated dry anaerobic fermentation device for continuous treatment of agricultural waste is as follows:

[0054] The biomass fermentation material consisting of agricultural waste is fed into the feed bin 101 through the feed section 104, and the material is fed into the feed section 103 through the feed mechanism 102. The material slides into the inner shell 202 through the feed section 103, and the inner shell 202 rotates under the drive of the drive mechanism 205, and the push plate 203 pushes the material forward. During this process, the spray pipe 211 above replenishes the fermentation liquid into the inner shell 202, and the material continues to move forward. When the material moves to the gap between the two push plates 203, it is pushed forward by the push plate 203. The scraper 204 scrapes off the material adhering to the inner wall of the inner shell 202, thereby shoveling up the material in the middle, so that the accumulated material in the middle is exposed for further fermentation. The material enters the discharge port 303 of the discharge bin 301 through the opening at the other end of the inner shell 202 and falls into the solid-liquid separation mechanism 305, and the fermented material is separated into a solid matter part and a liquid matter part. The biogas generated in the inner shell 202 is passed into the biogas collection device through the exhaust port 302, thereby completing the fermentation operation of the biomass material.

[0055] This integrated dry anaerobic fermentation device for continuous treatment of agricultural waste has the following advantages:

[0056] 1. By designing the height difference between the feed section 103 and the feeding section 104, a liquid sealing function can be achieved in the feed bin 101, thereby reducing the probability of biogas leakage;

[0057] 2. Feeding materials between the feeding section 103 and the feeding section 104 by a bucket elevator can realize the function of continuous or intermittent feeding according to the fermentation requirements;

[0058] 3. By designing the inner shell 202 to be rotatable along the axis, the material can roll in the inner shell 202. During the rolling process, the material in the middle is rolled out and exposed to the fermentation environment, thereby ensuring the uniformity of the material fermentation;

[0059] 4. By designing the scraper 204, the problem that the biomass material adheres to the wall of the inner shell 202 and makes the middle material difficult to ferment can be solved, thereby improving the fermentation efficiency and fermentation uniformity of the material, and the scraper 204 can also improve the material transportation efficiency.

[0060] The above are only embodiments of the present invention. The common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An integrated dry anaerobic fermentation device for continuously treating agricultural waste, characterized in that: include: Feed unit, comprising: A feed bin, wherein the feed bin is provided with a feed section and a feeding section, the discharge port of the feed section extends to the bottom of the feed bin, and the height of the feed port of the feeding section is higher than the height of the discharge port of the feed section; A feeding mechanism, which is arranged in the feeding bin and is used to transport materials to the feeding port of the feeding section; Fermentation unit, comprising: A housing connected to the feed bin; An inner shell, the inner shell being rotatably disposed inside the outer shell along its own axis; A push plate, wherein the push plates are provided in a plurality of pieces and are arranged in sequence and spaced apart along the axis of the inner shell, and are arranged spirally around the inner wall of the inner shell; A scraper, the scraper is arranged in the inner shell, and the scraper is used to scrape the material adhered to the inner wall of the inner shell; a driving mechanism, the driving mechanism being in contact with the inner shell and being used to drive the inner shell to rotate; Discharging unit, including: A discharge bin, the discharge bin being connected to the other end of the outer shell relative to the feed bin, and the discharge bin having an exhaust port and a discharge port communicating with the inner shell; The inner shell is tilted so that the end of the inner shell close to the discharge bin is higher than the end of the inner shell close to the feed bin; The fermentation unit also includes: a fixed shaft, which is arranged at the upper end of the inner shell, the fixed shaft is connected to the discharge unit, and scrapers are arranged at intervals and connected to the fixed shafts in sequence. The blade edge of the scraper is arranged toward the inner wall of the upper end of the inner shell and there is a gap between the scraper and the inner wall. There is an angle a between the scraper and the vertical plane. The angle a is the angle between the surface of the scraper facing away from the material and the vertical plane. The angle a is less than 90°, and the lower end of the scraper is bent toward the side where the material comes.

2. The dry anaerobic fermentation device according to claim 1, characterized in that: The feeding mechanism is a bucket elevator, and the bucket elevator is vertically arranged in the feeding bin.

3. The dry anaerobic fermentation device according to claim 2, characterized in that: The fermentation unit also includes: A reflux groove, the reflux groove is connected to the lower end of the inner shell located at one end of the discharge bin, and the reflux groove is used to receive liquid overflowing from the inner shell at the end on this side; A reflux pipe, one end of which is connected to the reflux tank, and the other end of which is connected to the feed bin.

4. The dry anaerobic fermentation device according to claim 1, characterized in that: The fermentation unit also includes: A spray pipe is arranged in the inner shell along the length direction of the inner shell, and a plurality of spray ports are sequentially opened at the lower end of the spray pipe along the length direction.

5. The dry anaerobic fermentation device according to claim 1, characterized in that: The driving mechanism comprises: A guide rail, wherein the guide rail is an annular structure sleeved on the outer side of the inner shell; A roller, the roller is rotatably disposed below the guide rail and in contact with the guide rail; A driving member is connected to the roller and is used to drive the roller to rotate.

6. The dry anaerobic fermentation device according to claim 1, characterized in that: The discharging unit also includes: A solid-liquid separation mechanism, wherein the feed port of the solid-liquid separation mechanism is located below the discharge port.

7. The dry anaerobic fermentation device according to claim 1, characterized in that: The fermentation unit also includes: A heating mechanism is disposed between the outer shell and the inner shell, and is used to heat the material in the inner shell.

8. The dry anaerobic fermentation device according to claim 1, characterized in that: The inner side of the shell is provided with a heat-insulating layer.

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