Anaerobic fermentation device for millet straw

Abstract

This invention relates to the field of agricultural waste resource utilization technology, and provides a millet straw anaerobic fermentation device (100). The anaerobic fermentation device (100) includes: a row of fermentation chambers (11), including multiple independent fermentation chambers (30) arranged sequentially; a combined functional pipeline (20) connected to the multiple independent fermentation chambers (30) for spraying water into the independent fermentation chambers (30) and discharging leachate from the independent fermentation chambers (30); a biogas pipeline (21) connected to the multiple independent fermentation chambers (30) for collecting and transporting biogas; and multiple silo doors (12), corresponding one-to-one with the multiple independent fermentation chambers (30), wherein the multiple silo doors (12) are configured to open in conjunction with each other and close independently of each other. The millet straw anaerobic fermentation device can improve the efficiency of loading straw into the anaerobic fermentation device, reduce labor intensity, and reduce the number of motors required for electrically controlled silo doors.

Description

Technical Field

[0001] This invention relates to the field of agricultural waste resource utilization technology, specifically to an anaerobic fermentation device for millet straw. Background Technology

[0002] Straw, a byproduct of crop harvesting, occupies farmland space. If it cannot be utilized, it needs to be disposed of. Straw burning is a common method of straw disposal in rural areas, causing serious environmental pollution problems. Strengthening the comprehensive utilization of straw can not only solve environmental pollution problems but also potentially alleviate resource scarcity and increase farmers' income. Millet straw is a relatively abundant type of straw in agricultural production. If it can be comprehensively utilized, it can not only turn waste into treasure, protect the ecological environment, and promote the sustainable development of agricultural production, but also drive the transformation of rural industrial structure, improve farmers' quality of life, and improve the urban and rural environment.

[0003] Anaerobic fermentation technology can be used to treat millet straw using microorganisms, producing combustible biogas. The millet straw is pre-crushed and fed into the biogas digester, where temperature, moisture, and pH are controlled to obtain this clean energy, enabling the reuse of agricultural waste. In existing straw biogas plants, anaerobic fermentation units are typically arranged in rows of multiple fermentation chambers. Each row consists of several adjacent chambers. When supplying straw to the chambers, the doors must be opened and closed one by one. If the doors are manually operated, each chamber requires manually opening and loading straw, then closing the door, and repeating the process. If the doors are electrically operated, each chamber needs a separate motor to independently control the opening and closing of its door. Such anaerobic fermentation units are labor-intensive and inefficient when loading straw, or require the repeated placement of multiple motors, making the system complex.

[0004] In addition, the leachate produced during the fermentation process of the anaerobic fermentation device contains a large number of microorganisms. If it can be repeatedly added to the straw, it can greatly improve the gas production efficiency. In the existing technology, the leachate is generally discharged after accumulating to a certain extent in the fermentation chamber. The anaerobic fermentation device cannot recycle it for its own use. Summary of the Invention

[0005] The purpose of this invention is to at least partially overcome the deficiencies of the prior art and provide a novel anaerobic fermentation device for millet straw.

[0006] The present invention also aims to provide an anaerobic fermentation device for millet straw, which can improve the efficiency of loading straw into the anaerobic fermentation device and reduce labor intensity.

[0007] The present invention also aims to provide an anaerobic fermentation device for millet straw, which reduces the dependence of the silo door on the motor and reduces the number of motors required when the silo door is electrically controlled.

[0008] The present invention also aims to provide an anaerobic fermentation device for millet straw, which reduces the number of motors while still allowing the silo door to be closed independently, so as to start the anaerobic fermentation process earlier and improve gas production efficiency.

[0009] Another objective of this invention is to provide an anaerobic fermentation device for millet straw that can recycle leachate using a water supply pipeline.

[0010] To achieve the above-mentioned objectives or one of them, the technical solution of the present invention is as follows:

[0011] An anaerobic fermentation device for millet straw, the anaerobic fermentation device comprising:

[0012] A series of fermentation chambers, comprising multiple independent fermentation chambers arranged sequentially;

[0013] The combined functional pipeline connects to multiple independent fermentation chambers and is used to spray water into and out of the independent fermentation chambers.

[0014] Biogas pipelines connect to multiple independent fermentation chambers for collecting and transporting biogas;

[0015] Multiple doors correspond one-to-one with multiple independent fermentation chambers.

[0016] The multiple compartment doors are configured to open in a coordinated manner and close independently of each other.

[0017] According to a preferred embodiment of the present invention, each independent fermentation chamber is provided with two bearing units, and each bearing unit is provided with a drive shaft;

[0018] Each compartment door is equipped with at least one linkage rod, which is fixedly connected to the drive shaft, so that the compartment door can rotate about the axis of the drive shaft under the rotational drive of the drive shaft.

[0019] According to a preferred embodiment of the present invention, a first transmission rod, a second transmission rod, and an intermediate transmission component are provided between two adjacent independent fermentation chambers;

[0020] The end of the first transmission rod is provided with a receiving cavity for accommodating an intermediate transmission component; the end of the second transmission rod is fixedly provided with a protruding plate extending toward the first transmission rod, the protruding plate being approximately parallel to the radial direction of the second transmission rod.

[0021] The intermediate transmission component is disc-shaped. A push rod extending toward the second transmission rod is provided on the end face of the intermediate transmission component facing the second transmission rod. A recess is provided on the circumferential surface of the intermediate transmission component. A movable wedge rod parallel to the push rod is provided in the recess. The movable wedge rod is connected to the wall of the recess by a compression spring, so that there is a gap between the push rod and the movable wedge rod. The protruding plate is provided in the gap between the push rod and the movable wedge rod.

[0022] According to a preferred embodiment of the present invention, the cross section of the protruding plate along the axis perpendicular to the second transmission rod is T-shaped, the vertical part of the T-shape is arranged radially along the second transmission rod, and the head of the T-shape is arranged circumferentially along the second transmission rod, such that the head can abut against the push rod or the movable wedge rod when the second transmission rod rotates.

[0023] According to a preferred embodiment of the present invention, the first transmission rod is fixedly connected to the transmission shaft of the adjacent independent fermentation chamber or is integrally formed with the transmission shaft of the adjacent independent fermentation chamber;

[0024] The second transmission rod is fixedly connected to the transmission shaft of the adjacent independent fermentation chamber or is integrally formed with the transmission shaft of the adjacent independent fermentation chamber.

[0025] According to a preferred embodiment of the present invention, only the independent fermentation chamber located at one end of the row of fermentation chambers is provided with an actuation motor, and the actuation motor is connected to the drive shaft on the independent fermentation chamber; the other independent fermentation chambers are not provided with actuation motors.

[0026] According to a preferred embodiment of the present invention, a base is provided at the bottom of each independent fermentation chamber, a percolation tank is provided in the base, the percolation tank is funnel-shaped, and a filter plate is provided above the percolation tank.

[0027] According to a preferred embodiment of the present invention, the filter plate has uniformly distributed filter holes, the inner contour of which is frustoconical, such that the diameter of the upper end of the filter hole is smaller than the diameter of the lower end of the filter hole.

[0028] According to a preferred embodiment of the present invention, a lifting pipe is provided in each independent fermentation chamber, the lower vertical end of the lifting pipe is connected to the bottom of the percolate tank through a connecting channel located in the substrate, and the upper vertical end of the lifting pipe is connected to the combined functional pipe.

[0029] The lifting pipe is equipped with at least three one-way valves, which are arranged sequentially and at intervals on the lifting pipe, and the distance between two adjacent one-way valves gradually decreases from bottom to top.

[0030] According to a preferred embodiment of the present invention, a spiral auger is provided inside the combined functional pipe.

[0031] According to a preferred embodiment of the present invention, each compartment door is provided with a handle on its outer side for opening the compartment door; and / or

[0032] Each compartment door has a pull rope on the inside for closing.

[0033] This invention provides a novel anaerobic fermentation device for millet straw. It eliminates the need for a separate actuator motor to control the opening and closing of each independent fermentation chamber's door. This device allows multiple doors to open simultaneously, enabling the loading of millet straw into each chamber one by one. Each chamber's door can close relatively independently, allowing for the individual chamber to be closed after loading, thus facilitating the early initiation of the fermentation process. Because the device opens all doors simultaneously, it improves the efficiency of loading straw into the anaerobic fermentation unit. Furthermore, the independent control of each door's closing allows for earlier initiation of the anaerobic fermentation process in each chamber, increasing gas production efficiency. The present invention only installs an actuation motor on the independent fermentation chamber located at one end of the row of fermentation chambers, and does not install an actuation motor on the other independent fermentation chambers. Therefore, it reduces the dependence of the chamber door on the motor and reduces the number of motors required for electric control of the chamber door.

[0034] This invention achieves the above-mentioned functions by setting a first transmission rod, a second transmission rod, and an intermediate transmission component between two adjacent independent fermentation chambers. The first and second transmission rods are respectively connected to the transmission shafts of the doors of the two independent fermentation chambers. The invention is characterized by: a receiving cavity provided at the end of the first transmission rod, in which the intermediate transmission component and the protruding plate (described later) are housed; a protruding plate extending toward the first transmission rod is fixedly provided at the end of the second transmission rod, and the protruding plate has a head; the intermediate transmission component is disc-shaped, with a push rod extending toward the second transmission rod on its end face, and a recess provided on the circumference of the intermediate transmission component, in which a movable wedge rod parallel to the push rod is provided. The movable wedge rod is connected to the wall of the recess by a compression spring, so that there is a gap between the push rod and the movable wedge rod, and the protruding plate can just extend into the gap between the push rod and the movable wedge rod.

[0035] The principle of the linkage control of multiple fermentation chambers is as follows: The leftmost independent fermentation chamber equipped with an actuating motor is defined as the first fermentation chamber, and its corresponding door is the first door. Moving to the right, the doors are sequentially designated as the second fermentation chamber, second door, third fermentation chamber, and third door. The description is based on the observation perspective along a right-to-left direction (the radial direction of the first and second drive rods). Initially, all doors are closed. When the actuating motor starts to pre-open the first door, the first drive rod rotates clockwise. Since the compression spring is always compressed, without external force, the compression spring pushes the movable wedge against the wall of the cavity containing the first drive rod. When the first transmission rod rotates clockwise, under the action of the large spring force, the movable wedge rod remains largely stationary. The movable wedge rod then wedges between the inner wall of the first transmission rod and the wall of the recessed portion of the intermediate transmission member, thus fixing the first transmission rod and the intermediate transmission member relatively. (Here, to strengthen the wedging force, the inner wall of the receiving cavity of the first transmission rod can be specially designed, for example, by adding ridges or shape elements that facilitate clamping the movable wedge rod. Furthermore, the recessed portion of the intermediate transmission member is not limited to the shape of this invention and can be any shape that facilitates wedging.) At this time, the intermediate transmission member rotates together with the first transmission rod. The rotation of the intermediate transmission component drives the extension plate to rotate via the push rod, which in turn drives the second transmission rod to rotate. The second transmission rod is connected to the second compartment door. This means that when the actuator motor starts and opens the first compartment door, the subsequent second, third, and so on doors will simultaneously rotate and open. This allows for rapid loading of straw into each independent fermentation chamber without having to open the doors one by one. It is recommended to start loading straw into the leftmost first fermentation chamber. After loading the leftmost first fermentation chamber, manually pull the inner rope of its door to close it. When the door of the first fermentation chamber on the side is closed, the first transmission rod rotates counterclockwise. At this time, the intermediate transmission component also tends to rotate counterclockwise. The movable wedge rod is pushed back along the compression spring by the head of the protruding plate. At this time, the wedge-tight relationship between the first transmission rod and the intermediate transmission component is released. The rotation of the first transmission rod does not drive the intermediate transmission component to rotate. Therefore, the first door can be closed alone without closing the second door and subsequent doors, which remain open. Then, the third fermentation chamber can be loaded and the third door closed in sequence until the fermentation of the last active fermentation chamber is completed and the last door is closed.

[0036] Furthermore, the bottom of the independent fermentation chamber of the present invention is provided with a base, and a leachate tank is provided in the base. The leachate tank is funnel-shaped, which is conducive to the collection and discharge of leachate. A filter plate is provided above the leachate tank. The filter holes of the filter plate are designed so that their inner contours are frustoconical, so that the diameter of the upper end of the filter hole is smaller than the diameter of the lower end of the filter hole. This can effectively prevent the filter hole from being blocked. After individual straw residues enter the filter hole, they are easily discharged because the lower diameter is larger.

[0037] Furthermore, this invention constructs a combined functional pipeline from the water spray pipes typically used for water supply. This pipeline not only sprays water onto the straw but also discharges leachate from the individual fermentation chambers and recirculates the leachate back to the straw. Specifically, each individual fermentation chamber is equipped with a lifting pipe. The lower vertical end of the lifting pipe is connected to the bottom of the leachate tank via a connecting channel located within the base, while the upper vertical end of the lifting pipe is connected to the combined functional pipeline. Multiple one-way valves are installed on the lifting pipes. These valves only allow leachate to be transported upwards within the lifting pipes and not downwards. The multiple one-way valves are sequentially and intermittently arranged on the lifting pipes, with the distance between adjacent one-way valves gradually decreasing from bottom to top. Furthermore, a spiral auger is installed within the combined functional pipeline. The combined functional pipeline can operate in different states. Under normal conditions, it functions as a water supply pipeline, spraying water onto the straw through nozzles on the pipeline. When the leachate accumulates to a certain level in the independent fermentation chamber, the combined functional pipeline can be switched to a leachate recovery state. In this state, water is no longer supplied to the combined functional pipeline, and the water inside is completely drained. Instead, a high-speed airflow is supplied to the combined functional pipeline. At this time, all nozzles remain closed. The high-speed airflow generates negative pressure in the lifting pipe, drawing the leachate into the lifting pipe and gradually lifting it until it enters the combined functional pipeline, where it is carried by the airflow into the leachate. The leachate collection container features one-way valves with gradually decreasing spacing from bottom to top, facilitating the gradual lifting of the leachate. A spiral auger within the combined functional pipeline helps to expel the leachate, including any straw residue that may be mixed in. Once the leachate collection is complete, the combined functional pipeline can be switched to leachate supply mode. The collected leachate, after filtration, is circulated from the collection container back into the combined functional pipeline, and sprayed onto the straw through nozzles, thus achieving a continuous supply of leachate. Because the leachate contains a large number of microorganisms, each recirculation of the leachate on the biomass results in continuous bacterial inoculation, significantly improving fermentation efficiency. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a millet straw anaerobic fermentation device according to an embodiment of the present invention;

[0039] Figure 2 for Figure 1 An enlarged view of part A in the image;

[0040] Figure 3 for Figure 1 An enlarged exploded view of part A in the image;

[0041] Figure 4 It is shown from another perspective, in a decomposed state. Figure 1 Part A of the text;

[0042] Figure 5 for Figure 2 BB section diagram;

[0043] Figure 6 A cross-sectional view of a millet straw anaerobic fermentation device according to an embodiment of the present invention;

[0044] Figure 7 An exploded view of the bottom of the independent fermentation chamber of a millet straw anaerobic fermentation device according to an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of a filter plate according to an embodiment of the present invention;

[0046] Figure 9 This is a partial cross-sectional view of a millet straw anaerobic fermentation device according to an embodiment of the present invention;

[0047] Figure 10 A cross-sectional view of a combined functional pipeline according to an embodiment of the present invention;

[0048] Figure 11 This is another cross-sectional view of a millet straw anaerobic fermentation device according to an embodiment of the present invention;

[0049] Figure 12 The back side of the silo door of a millet straw anaerobic fermentation device according to an embodiment of the present invention is shown. Detailed Implementation

[0050] Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements. Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the drawings.

[0051] Figure 1An anaerobic fermentation device 100 for millet straw according to an embodiment of the present invention is shown. The anaerobic fermentation device 100 mainly includes a row of fermentation chambers 11, a combined functional pipeline 20, and a biogas pipeline 21. The row of fermentation chambers 11 can be a concrete structure and includes multiple independent fermentation chambers 30 arranged sequentially. Only three are shown in the figure; in reality, each row of fermentation chambers 11 can have more than ten independent fermentation chambers 30. The combined functional pipeline 20 communicates with the multiple independent fermentation chambers 30 and is used to spray water into and discharge leachate from the independent fermentation chambers 30. The portion of the combined functional pipeline 20 located within the independent fermentation chambers 30 has nozzles 33, which can be electrically controlled and can be opened and closed. The biogas pipeline 21 communicates with the multiple independent fermentation chambers 30 and is used to collect and transport biogas. Multiple silo doors 12 correspond one-to-one with the multiple independent fermentation chambers 30, and a sealing gasket 41 is provided on the inner side of each silo door 12 to seal the independent fermentation chamber 30.

[0052] Advantageously, the plurality of compartment doors 12 are configured to open in a coordinated manner and close independently of each other. See also Figure 1 Each independent fermentation chamber 30 is equipped with two bearing units 15, and each bearing unit 15 is equipped with a drive shaft 14; only the independent fermentation chamber 30 located at one end of the row of fermentation chambers 11 is equipped with an actuation motor 13, such as Figure 1 As shown in the leftmost independent fermentation chamber 30, the actuating motor 13 is connected to the drive shaft 14 on this independent fermentation chamber 30. The other independent fermentation chambers 30 do not have actuating motors 13. Each chamber door 12 is equipped with two linkage rods 16, which are fixedly connected to the drive shaft 14, allowing the chamber door 12 to rotate about the axis of the drive shaft 14 under the rotational drive of the drive shaft 14. Here, the actuating motor 13 can be a unidirectional rotary motor.

[0053] See Figure 3 , Figure 4Between two adjacent independent fermentation chambers 30, a first transmission rod 17, a second transmission rod 18, and an intermediate transmission component 22 are provided; the end of the first transmission rod 17 is provided with a receiving cavity 23 for accommodating the intermediate transmission component 22, and the depth of the receiving cavity 23 is greater than the thickness of the intermediate transmission component 22; the end of the second transmission rod 18 is fixedly provided with a protruding plate 24 extending toward the first transmission rod 17, and the protruding plate 24 is approximately parallel to the radial direction of the second transmission rod 18; the depth of the receiving cavity 23 is slightly greater than the sum of the thickness of the intermediate transmission component 22 and the length of the protruding plate 24. The intermediate transmission component 22 is disc-shaped. A push rod 26 extending towards the second transmission rod 18 is provided on the end face of the intermediate transmission component 22 facing the second transmission rod 18. A recess 25 is provided on the circumferential surface of the intermediate transmission component 22. A movable wedge rod 27 parallel to the push rod 26 is provided within the recess 25. The movable wedge rod 27 is connected to the wall of the recess 25 by a compression spring 28, creating a gap between the push rod 26 and the movable wedge rod 27. A protruding plate 24 is disposed within the gap between the push rod 26 and the movable wedge rod 27. The length of the movable wedge rod 27 extending beyond the end face of the intermediate transmission component 22 is the same as the length of the push rod 26. Figure 5 As shown, the cross-section of the protruding plate 24 along the axis perpendicular to the second transmission rod 18 is T-shaped. The vertical part of the T-shape is arranged radially along the second transmission rod 18, and the head 29 of the T-shape is arranged circumferentially along the second transmission rod 18, so that the head 29 can abut against the push rod 26 or the movable wedge rod 27 when the second transmission rod 18 rotates.

[0054] Specifically, the first transmission rod 17 is fixedly connected to the transmission shaft 14 of the adjacent independent fermentation chamber 30 or is integrally formed with the transmission shaft 14 of the adjacent independent fermentation chamber 30; the second transmission rod 18 is fixedly connected to the transmission shaft 14 of the adjacent independent fermentation chamber 30 or is integrally formed with the transmission shaft 14 of the adjacent independent fermentation chamber 30.

[0055] This invention provides a novel anaerobic fermentation device for millet straw. It eliminates the need for a separate actuator motor to control the opening and closing of each independent fermentation chamber's door. This device allows multiple doors to open simultaneously, enabling the loading of millet straw into each chamber one by one. Each chamber's door can close relatively independently, allowing for the individual chamber to be closed after loading, thus facilitating the early initiation of the fermentation process. Because the device opens all doors simultaneously, it improves the efficiency of loading straw into the anaerobic fermentation unit. Furthermore, the independent control of each door's closing allows for earlier initiation of the anaerobic fermentation process in each chamber, increasing gas production efficiency. The present invention only installs an actuation motor on the independent fermentation chamber located at one end of the row of fermentation chambers, and does not install an actuation motor on the other independent fermentation chambers. Therefore, it reduces the dependence of the chamber door on the motor and reduces the number of motors required for electric control of the chamber door.

[0056] This invention achieves the above-mentioned functions by setting a first transmission rod, a second transmission rod, and an intermediate transmission component between two adjacent independent fermentation chambers. The first and second transmission rods are respectively connected to the transmission shafts of the doors of the two independent fermentation chambers. The invention is characterized by: a receiving cavity provided at the end of the first transmission rod, in which the intermediate transmission component and the protruding plate (described later) are housed; a protruding plate extending toward the first transmission rod is fixedly provided at the end of the second transmission rod, and the protruding plate has a head; the intermediate transmission component is disc-shaped, with a push rod extending toward the second transmission rod on its end face, and a recess provided on the circumference of the intermediate transmission component, in which a movable wedge rod parallel to the push rod is provided. The movable wedge rod is connected to the wall of the recess by a compression spring, so that there is a gap between the push rod and the movable wedge rod, and the protruding plate can just extend into the gap between the push rod and the movable wedge rod.

[0057] The principle of the coordinated control of multiple compartment doors is as follows: See Figure 1 The leftmost independent fermentation chamber equipped with an actuating motor is defined as the first fermentation chamber, and its corresponding door is designated as the first door. Moving to the right, the chambers are designated as the second fermentation chamber, its second door, the third fermentation chamber, and its third door. The description is based on the observation perspective along a right-to-left direction (the radial direction of the first and second drive rods). (Refer to...) Figure 5Initially, all compartment doors are closed. When the actuator motor starts to pre-open the first compartment door, the first transmission rod rotates clockwise. Since the compression spring is always in a compressed state, without external force, the compression spring pushes the movable wedge against the wall of the receiving cavity of the first transmission rod. When the first transmission rod rotates clockwise, under the action of the large spring force, the movable wedge remains largely stationary. The movable wedge will wed between the inner wall of the first transmission rod and the wall of the recess of the intermediate transmission component, making the first transmission rod and the intermediate transmission component relatively fixed (here, to strengthen the wedging force, the inner wall of the receiving cavity of the first transmission rod can be specially designed, for example, by adding ridges, adding shape elements that are conducive to clamping the movable wedge, and the recess of the intermediate transmission component is not limited to the shape of the present invention, but can be any shape that is conducive to wedging). At this time, the intermediate transmission component rotates together with the first transmission rod, and the rotation of the intermediate transmission component drives the protruding plate to rotate through the push rod, thereby driving the second transmission rod to rotate. The second transmission rod is connected to the second compartment door. That is to say, when When the actuator motor starts and opens the first chamber door, the subsequent second, third, and so on doors will simultaneously rotate and open. This allows for rapid loading of straw into each independent fermentation chamber without having to open each chamber door individually. It is recommended to start loading straw into the leftmost first fermentation chamber. Once the leftmost first fermentation chamber is loaded, manually pull the inner rope of its door to close it. When the leftmost first fermentation chamber door is closed, the first drive rod rotates counter-clockwise. At this time, the intermediate drive component also tends to rotate counter-clockwise. The movable wedge rod is pushed back along the compression spring by the head of the protruding plate. This releases the wedging relationship between the first drive rod and the intermediate drive component. The rotation of the first drive rod does not drive the intermediate drive component to rotate. Therefore, the first chamber door can be closed independently without closing the second and subsequent chamber doors, which remain open. Then, the third fermentation chamber can be loaded and its door closed sequentially until the fermentation of the last active fermentation chamber is completed and the last door is closed.

[0058] According to a preferred embodiment of the present invention, a handle 19 is provided on the outer side of each compartment door 12 for opening the compartment door 12; and / or a pull rope is provided on the inner side of each compartment door 12 for closing the compartment door 12. This facilitates manual opening or closing of the compartment door 12.

[0059] According to a preferred embodiment of the present invention, a base 36 is provided at the bottom of each independent fermentation chamber 30, and a percolation tank 31 is provided in the base 36. The percolation tank 31 is funnel-shaped, and a filter plate 32 is provided above the percolation tank 31. A filter plate seat 37 is provided on the upper side of the percolation tank 31, and the filter plate 32 is installed in the filter plate seat 37. The filter plate 32 has uniformly distributed filter holes 38, and the inner contour of the filter holes 38 is frustoconical, such that the diameter of the upper end of the filter hole 38 is smaller than the diameter of the lower end of the filter hole 38. The bottom of the independent fermentation chamber of this invention is provided with a base, and a leachate tank is provided in the base. The leachate tank is funnel-shaped, which is conducive to the collection and discharge of leachate. A filter plate is provided above the leachate tank. The filter holes of the filter plate are designed so that the inner contour of the filter hole is frustoconical, so that the diameter of the upper end of the filter hole is smaller than the diameter of the lower end of the filter hole. This can effectively prevent the filter hole from being blocked. If some straw residue enters the filter hole, it is easy to be discharged because the lower diameter is larger.

[0060] Preferably, each independent fermentation chamber 30 is provided with a lifting pipe 34, the lower vertical end of which is connected to the bottom of the leachate tank 31 through a connecting channel 39 located in the base 36, and the upper vertical end of which is connected to the combined functional pipe 20; at least three one-way valves 35 are provided on the lifting pipe 34, the at least three one-way valves 35 are arranged sequentially and at intervals on the lifting pipe 34, and the distance between two adjacent one-way valves 35 gradually decreases from bottom to top; and a spiral auger 40 is provided in the combined functional pipe 20.

[0061] This invention constructs a combined functional pipeline from a water spray pipe typically used for supplying water. It can both spray water onto the straw and discharge leachate from the individual fermentation chambers, circulating the leachate back to the straw. Specifically, each individual fermentation chamber is equipped with a lifting pipe. The lower vertical end of the lifting pipe is connected to the bottom of the leachate tank via a connecting channel located within the base, and the upper vertical end of the lifting pipe is connected to the combined functional pipeline. Multiple one-way valves are installed on the lifting pipes, allowing leachate to flow upwards only and preventing it from flowing downwards. These one-way valves are arranged sequentially and at intervals on the lifting pipes, with the distance between adjacent one-way valves gradually decreasing from bottom to top. Furthermore, a spiral auger is installed within the combined functional pipeline. The combined functional pipeline can operate in different states. Under normal conditions, it functions as a water supply pipeline, spraying water onto the straw through nozzles on the pipeline. When the leachate accumulates to a certain level in the independent fermentation chamber, the combined functional pipeline can be switched to a leachate recovery state. In this state, water is no longer supplied to the combined functional pipeline, and the water inside is completely drained. Instead, a high-speed airflow is supplied to the combined functional pipeline. At this time, all nozzles remain closed. The high-speed airflow generates negative pressure in the lifting pipe, drawing the leachate into the lifting pipe and gradually lifting it until it enters the combined functional pipeline, where it is carried by the airflow into the leachate. The leachate collection container features one-way valves with gradually decreasing spacing from bottom to top, facilitating the gradual lifting of the leachate. A spiral auger within the combined functional pipeline helps to expel the leachate, including any straw residue that may be mixed in. Once the leachate collection is complete, the combined functional pipeline can be switched to leachate supply mode. The collected leachate, after filtration, is circulated from the collection container back into the combined functional pipeline, and sprayed onto the straw through nozzles, thus achieving a continuous supply of leachate. Because the leachate contains a large number of microorganisms, each recirculation of the leachate on the biomass results in continuous bacterial inoculation, significantly improving fermentation efficiency.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

[0063] List of reference numerals in the attached diagram:

[0064] 100 Anaerobic Fermentation Unit

[0065] 11-row fermentation chamber

[0066] 12 warehouse doors

[0067] 13 Actuator Motors

[0068] 14 drive shafts

[0069] 15 bearing units

[0070] 16 linkage rods

[0071] 17 First transmission rod

[0072] 18 Second transmission rod

[0073] 19 hands

[0074] 20 combined functional pipelines

[0075] 21 biogas pipelines

[0076] 22 Intermediate transmission components

[0077] 23 Receiving Cavity

[0078] 24 protruding panels

[0079] 25 concavities

[0080] 26 push rods

[0081] 27 movable wedge

[0082] 28 compression springs

[0083] 29 heads

[0084] 30 independent fermentation chambers

[0085] 31 leachate tank

[0086] 32 filter plates

[0087] 33 nozzles

[0088] 34 lifting pipes

[0089] 35 check valve

[0090] 36 base

[0091] 37 Filter Plate Seat

[0092] 38 holes

[0093] 39 connecting channels

[0094] 40 spiral auger

[0095] 41. Sealing gasket.

Claims

1. A millet straw anaerobic fermentation device (100), characterized in that, The anaerobic fermentation device (100) includes: The row of fermentation chambers (11) includes multiple independent fermentation chambers (30), which are arranged sequentially. The combined functional pipeline (20) is connected to multiple independent fermentation chambers (30) for spraying water into the independent fermentation chambers (30) and discharging leachate from the independent fermentation chambers (30); A biogas pipeline (21) is connected to multiple independent fermentation chambers (30) for collecting and transporting biogas; Multiple doors (12) correspond one-to-one with multiple independent fermentation chambers (30). The plurality of compartment doors (12) are configured to open in a coordinated manner and close independently of each other; Each independent fermentation chamber (30) is equipped with two bearing units (15), and each bearing unit (15) is equipped with a drive shaft (14). Each door (12) is provided with at least one linkage rod (16), which is fixedly connected to the drive shaft (14) so ​​that the door (12) can rotate about the axis of the drive shaft (14) under the rotation drive of the drive shaft (14). A first transmission rod (17), a second transmission rod (18), and an intermediate transmission component (22) are provided between two adjacent independent fermentation chambers (30). The end of the first transmission rod (17) is provided with a receiving cavity (23) for accommodating the intermediate transmission component (22); the end of the second transmission rod (18) is fixedly provided with a protruding plate (24) extending toward the first transmission rod (17), and the protruding plate (24) is radially parallel to the second transmission rod (18); The intermediate transmission component (22) is disc-shaped. A push rod (26) extending toward the second transmission rod (18) is provided on the end face of the intermediate transmission component (22) facing the second transmission rod (18). A recess (25) is provided on the circumferential surface of the intermediate transmission component (22). A movable wedge rod (27) parallel to the push rod (26) is provided in the recess (25). The movable wedge rod (27) is connected to the wall of the recess (25) by a compression spring (28), so that there is a gap between the push rod (26) and the movable wedge rod (27). The protruding plate (24) is provided in the gap between the push rod (26) and the movable wedge rod (27). The cross-section of the protruding plate (24) along the axis perpendicular to the second transmission rod (18) is T-shaped. The vertical part of the T-shape is arranged radially along the second transmission rod (18), and the head (29) of the T-shape is arranged circumferentially along the second transmission rod (18), so that the head (29) can abut against the push rod (26) or the movable wedge rod (27) when the second transmission rod (18) rotates. The first transmission rod (17) is fixedly connected to the transmission shaft (14) of the adjacent independent fermentation chamber (30) or is integrally formed with the transmission shaft (14) of the adjacent independent fermentation chamber (30); The second transmission rod (18) is fixedly connected to the transmission shaft (14) of the adjacent independent fermentation chamber (30) or is integrally formed with the transmission shaft (14) of the adjacent independent fermentation chamber (30); Only the independent fermentation chamber (30) located at one end of the row of fermentation chambers (11) is equipped with an actuation motor (13), which is connected to the drive shaft (14) on the independent fermentation chamber (30); the other independent fermentation chambers (30) are not equipped with actuation motors (13).

2. The millet straw anaerobic fermentation device (100) according to claim 1, characterized in that: Each independent fermentation chamber (30) has a base (36) at its bottom, and a percolation tank (31) is provided in the base (36). The percolation tank (31) is funnel-shaped, and a filter plate (32) is provided above the percolation tank (31).

3. The millet straw anaerobic fermentation device (100) according to claim 2, characterized in that: The filter plate (32) has uniformly distributed filter holes (38), and the inner contour of the filter holes (38) is frustoconical, so that the diameter of the upper end of the filter hole (38) is smaller than the diameter of the lower end of the filter hole (38).

4. The millet straw anaerobic fermentation device (100) according to claim 3, characterized in that: The combined functional pipeline (20) is equipped with a spiral auger (40).

5. The millet straw anaerobic fermentation device (100) according to any one of claims 1-4, characterized in that: Each compartment door (12) is provided with a handle (19) on the outside for opening the compartment door (12); and / or Each compartment door (12) has a pull rope on the inside for closing the compartment door (12).

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