An anaerobic fermentation reactor

Abstract

The present invention relates to the technical field of anaerobic fermentation, and in particular to an anaerobic fermentation reactor, comprising: a tank body, a stirring mechanism, a liquid storage mechanism, a circulation pipeline, and an auger. The present invention divides the tank body into a dry fermentation chamber and a wet fermentation chamber. Straw first passes through the dry fermentation chamber to destroy the lignin of the straw, and then undergoes wet fermentation, thereby increasing the straw degradation rate and improving the fermentation effect. Liquid is introduced into the liquid storage mechanism through the circulation pipeline, and the liquid storage mechanism then discharges liquid into the wet fermentation chamber, thereby controlling the liquid level in the wet fermentation chamber. In the process of the liquid storage mechanism moving up and down with the liquid level, a screw is driven to rotate by a nut, so that stirring blades 1 and 2 stir the materials in the dry fermentation chamber and the wet fermentation chamber, thereby reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic fermentation, in particular to an anaerobic fermentation reactor. Background Art

[0002] Anaerobic digestion refers to the decomposition and metabolism of organic matter (such as human and livestock feces, straw, weeds, etc.) under certain moisture, temperature and anaerobic conditions to form methane through microbial metabolism. This method can turn waste into treasure. At present, conventional anaerobic fermentation equipment generally uses a fully mixed fermentation tank, but this method has some problems. First, because straw is mainly composed of lignin, cellulose and hemicellulose, especially lignin is difficult to degrade, the anaerobic fermentation speed is slow and the straw degradation rate is low; second, the material in the fermentation tank is stirred by mechanical agitation to improve the fermentation efficiency. However, the stirring process of the motor consumes electricity, resulting in high energy consumption. Summary of the Invention

[0003] Therefore, the present invention is made in view of the above problems. The purpose of the present invention is to provide an anaerobic fermentation reactor. First, the straw is pre-fermented (i.e., dry fermentation) to allow the straw to be fermented and decomposed in advance to improve the utilization rate of the straw in subsequent wet fermentation. Second, by floating up and down, the dry anaerobic fermentation zone and the wet anaerobic fermentation zone are stirred by blades, thereby reducing energy consumption. The present invention achieves the above purposes through the following technical solutions:

[0004] An anaerobic fermentation reactor comprises: a tank body, a stirring mechanism, a liquid storage mechanism, a circulation pipeline, and an auger;

[0005] The tank body is provided with a liquid storage mechanism, which divides the tank body into a dry fermentation chamber and a wet fermentation chamber. A partition is provided at the lower end of the wet fermentation chamber. A certain space is left between the partition and the inner wall of the wet fermentation chamber. This space is a biogas slurry storage space. A gap is opened on the wall surface of the partition. The lower end of the wet fermentation chamber is connected to the auger through an electric butterfly valve. The wet fermentation chamber is connected to a liquid inlet pipe. The upper ends of the dry fermentation chamber and the wet fermentation chamber are respectively provided with an exhaust pipe 1 and an exhaust pipe 2, and the exhaust pipe 1 is connected to the exhaust pipe 2.

[0006] The stirring mechanism is multiple in number, and the stirring mechanism includes: a screw, a stirring blade 1, and a stirring blade 2. The upper and lower ends of the screw are connected to the upper and lower surfaces of the tank body through bearings. The screw is provided with a strip groove. The stirring blade 1 is multiple in number, and one end of the multiple stirring blades is fixed on the sleeve. The sleeve is nested in the screw, wherein the inner wall of the sleeve is provided with a slider 1, and the slider 1 is engaged with the strip groove of the screw. The stirring blade 2 is multiple in number, and the multiple stirring blades 2 are fixed to the screw. A limit baffle is provided on the screw.

[0007] The liquid storage mechanism includes: a material receiving plate, a liquid storage shell 1, a liquid storage shell 2, a valve, and a floating block 1. The material receiving plate is annular and is arranged downwardly along the axis of the tank body. A plurality of nuts are arranged at the edge of the material receiving plate, and the plurality of nuts are respectively engaged with a plurality of the screws. A plurality of baffles are arranged vertically downward on the bottom surface of the material receiving plate. The liquid storage shell 1 is slidably arranged in the material receiving plate. The lower end of the liquid storage shell is open. A liquid discharge port and an air port are opened on the wall of the liquid storage shell 1. The liquid storage shell 2 is arranged at the storage Inside the liquid housing one, the internal top surface of the liquid storage housing one is connected to the top surface of the liquid storage housing two through a compression spring, the combined weight of the material receiving plate and the liquid storage housing one is greater than the stress of the compression spring, a communication port is provided on one side wall of the liquid storage housing two, the top surface of the liquid storage housing two is connected to an air pipe, the air pipe passes through the liquid storage housing one upward, a support plate is provided at the lower end of the liquid storage housing two, the support plate is in contact with the bottom surfaces of the liquid storage housing one and the plurality of baffles, the valve is provided at the lower end of the liquid storage housing two, and the floating block one is provided on the bottom surface of the liquid storage housing two;

[0008] One end of the circulation pipe is connected to the biogas slurry storage space, and the other end is connected to the liquid storage shell 1 through a hose. The communication port of the liquid storage shell 2 is opposite to the connection point of the hose and the liquid storage shell 1. The circulation pipe is connected to a circulation pump.

[0009] Preferably, the valve includes: an outer tube, an inner tube, a torsion spring, and a second floating block. The upper end of the outer tube is located inside the second liquid storage shell. A drain port is provided on the vertical wall surface of the upper end of the outer tube. A limited slide groove is provided at the lower end of the outer tube. The limited slide groove is composed of a slideway 1 and a slideway 2 that are connected end to end. The width of the slideway 2 is greater than that of the slideway 1. The center of the slideway 2 is slidably connected to the limited block, and a circular channel is formed in the slideway 2 through the limited block. The lower end of the slideway 2 is a slope 1 that is inclined downward, and the side of the limit block corresponding to the slope 1 is a slope 2. The inner tube is nested in the outer tube, and a cylindrical A slider, one end of the cylindrical slider is inserted into the limiting slide groove, and one end of the initial cylindrical slider is located at the lower end of the slideway one, and a drain port two is provided on the vertical wall surface at the lower end of the inner tube, and the drain port one and the drain port two are staggered ninety degrees, and the float block two is located in the liquid storage shell two and connected to the upper end of the inner tube, and a hydraulic spring rod is also provided at the upper end of the interior of the liquid storage shell two, and the lower end of the hydraulic spring rod is rotatably connected to the top surface of the float block two, and the torsion spring surrounds the outer tube, and one end of the torsion spring is connected to the float block two, and the other end is connected to the inner wall of the liquid storage shell two, wherein the stress of the hydraulic spring rod is greater than that of the torsion spring, and the buoyancy of the float block two is greater than that of the hydraulic spring rod.

[0010] Beneficial effects of the present invention:

[0011] 1. The present invention divides the tank into a dry fermentation chamber and a wet fermentation chamber. The straw first passes through the dry fermentation chamber to destroy the lignin in the straw, and then undergoes wet fermentation, thereby increasing the straw degradation rate and improving the fermentation effect.

[0012] 2. The present invention feeds liquid into the liquid storage mechanism through a circulation pipe, and the liquid storage mechanism then discharges the liquid into the wet fermentation chamber, thereby controlling the liquid level in the wet fermentation chamber. During the up and down movement of the liquid storage mechanism, the screw is driven to rotate by the nut, thereby stirring the materials in the dry fermentation chamber and the wet fermentation chamber through the stirring blade 1 and the stirring blade 2. The above energy consumption is the energy consumption used when the circulation pump extracts the biogas slurry. Compared with the case where the motor directly drives the stirring blade to rotate, the energy consumption is reduced, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0015] Figure 3 It is a schematic diagram of the local structure of the stirring mechanism of the present invention.

[0016] Figure 4 It is a structural schematic diagram of the liquid storage mechanism of the present invention.

[0017] Figure 5 It is a structural schematic diagram of the splicing plate of the present invention.

[0018] Figure 6 This is a schematic diagram of the limiting groove structure of the present invention.

[0019] Figure 7 Schematic diagram of liquid storage of the liquid storage mechanism of the present invention Figure 1 .

[0020] Figure 8 Schematic diagram of liquid storage of the liquid storage mechanism of the present invention Figure 2 . DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that it is easy for a person skilled in the art to implement these embodiments. However, the present invention can also be implemented in various different forms. Therefore, the present invention is not limited to the embodiments described below. In addition, in order to more clearly describe the present invention, parts that are not connected with the invention will be omitted from the accompanying drawings.

[0022] like Figure 1-2 As shown, an anaerobic fermentation reactor includes: a tank body 1, a stirring mechanism 2, a liquid storage mechanism 3, a circulation pipe 4, and an auger 5;

[0023] The tank body 1 is provided with a liquid storage mechanism 3, and the liquid storage mechanism 3 divides the tank body 1 into two chambers, the upper chamber of the tank body 1 is a dry fermentation chamber 1-1, and the lower space of the tank body 1 is a wet fermentation chamber 1-2. The straw first passes through the dry fermentation chamber 1-1 and then enters the wet fermentation chamber 1-2. The purpose is to pre-treat the straw, destroy the lignin of the straw, and achieve rapid fermentation of the straw. The top surface of the dry fermentation chamber 1-1 is provided with a cover 11, and the chopped straw is put into the dry fermentation chamber 1-1 by opening the cover 11. The lower end of the wet fermentation chamber 1-2 is provided with a partition 12, and a certain space is left between the partition 12 and the inner wall of the wet fermentation chamber 1-2. This space is the biogas slurry storage space, and a gap is opened on the wall surface of the partition 12. The straw cannot pass through the gap to enter the biogas slurry storage space. The wet fermentation chamber 1-2 is funnel-shaped at the lower end of the partition 12. The funnel-shaped lower end of the wet fermentation chamber 1-2 is connected to the auger 5 through an electric butterfly valve 16. By opening the electric butterfly valve 16, the biogas slurry and biogas residue are discharged along the auger 5. The wet fermentation chamber 1-2 is connected with a liquid inlet pipe 13. The liquid inlet pipe 13 is used to transport a mixture of poultry manure and hot water into the wet fermentation chamber 1-2. The upper ends of the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2 are respectively provided with an exhaust pipe 14 and an exhaust pipe 2 15. The exhaust pipe 14 is connected to the exhaust pipe 2 15, that is, the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2 are connected. The exhaust pipe 14 and the exhaust pipe 2 15 are used to discharge the biogas generated in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2. The dry fermentation chamber 1-1 and the wet fermentation chamber 1-2 are provided with heating elements (not shown in the figure). The heating elements control the temperature in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2;

[0024] There are multiple stirring mechanisms 2, and multiple stirring mechanisms 2 are arranged inside the tank body 1 along the axis thereof. The stirring mechanism 2 includes: a screw 21, a stirring blade 1 22, and a stirring blade 23. The upper and lower ends of the screw 21 are connected to the upper and lower surfaces of the tank body 1 through bearings. Figure 3As shown, the screw 21 is provided with a strip groove 211, the number of the stirring blades 22 is multiple, one end of the multiple stirring blades 22 is fixed on the sleeve 221, the sleeve 221 is nested in the screw 21, wherein the inner wall of the sleeve 221 is provided with a slider 222, the slider 222 is engaged with the strip groove 211 of the screw 21, so that the multiple stirring blades 22 can move up and down along the screw 21, and when the screw 21 rotates, the multiple stirring blades 22 are driven to rotate, the number of the stirring blades 23 is multiple, and the multiple stirring blades 23 are fixed to the screw 21, the stirring blade 22 is located in the dry fermentation chamber 1-1, and the stirring blade 23 is located in the wet fermentation chamber 1-2. On the screw 21, a limit baffle 24 is provided between the stirring blades 22 and the stirring blades 23;

[0025] like Figure 4 As shown, the liquid storage mechanism 3 includes: a material receiving plate 31, a liquid storage shell 1 32, a liquid storage shell 2 33, a valve 34, and a float 1 35. Figure 5As shown, the receiving plate 31 is annular and is arranged obliquely downward along the axis of the tank body 1. A plurality of nuts 311 are provided at the edge of the receiving plate 31. The plurality of nuts 311 are respectively engaged with the plurality of the screws 21. The bottom surface of the receiving plate 31 is provided with a plurality of baffles 312 that are vertically downward. Some of the baffles 312 are provided with chutes. The liquid storage housing 32 is arranged in the receiving plate 31, and the wall surfaces are fitted together, thereby forming a through-hole at the axis of the receiving plate 31. Blocking, the outer wall of the liquid storage shell 1 32 is provided with a plurality of sliders 2, the plurality of sliders 2 are engaged with the slide grooves provided on the baffle 312, the upper end of the liquid storage shell 1 32 is conical, the lower end of the liquid storage shell 1 32 is open, the wall of the liquid storage shell 1 32 is provided with a drain port 321, the liquid storage shell 1 32 is provided with an air port 322 above the drain port 321, the drain port 321 and the air port 322 are located in the dry fermentation chamber 1-1, the liquid storage shell 2 33 is provided in the liquid storage The interior of the shell 1 32 and the walls are in contact with each other. The top surface of the liquid storage shell 1 32 is connected to the top surface of the liquid storage shell 2 33 through a compression spring 323. The combined weight of the material receiving plate 31 and the liquid storage shell 1 32 is greater than the stress of the compression spring 323. A connecting port 331 is provided on one side wall of the liquid storage shell 2 33. The top surface of the liquid storage shell 2 33 is connected to an air pipe 332. The air pipe 332 passes through the liquid storage shell 1 32 upward and is connected to the dry fermentation chamber 1-1. A horizontally extending support plate 334 is provided at the lower end of the second body 33. The support plate 334 is in contact with the bottom surface of the liquid storage housing 1 32 and the multiple baffles 312. The valve 34 is provided at the lower end of the second liquid storage housing 33. The valve 34 controls the communication between the interior of the second liquid storage housing 33 and the wet fermentation chamber 1-2. The floating block 1 35 is provided on the bottom surface of the second liquid storage housing 33. The buoyancy of the floating block 1 35 by the biogas slurry supports the docking plate 31, the first liquid storage housing 32, and the second liquid storage housing 33.

[0026] The valve 34 includes: an outer tube 341, an inner tube 342, a torsion spring 343, and a second float 344. The upper end of the outer tube 341 is located inside the second liquid storage housing 33. A drain port 1 is provided on the vertical wall surface of the upper end of the outer tube 341. A limiting slide groove 345 is provided at the lower end of the outer tube 341. Figure 6As shown, the limiting slide groove 345 is composed of a slide 1 3451 and a slide 2 3452 which are connected to each other end to end, wherein the width of the slide 2 3452 is larger than that of the slide 1 3451, and the center of the slide 2 3452 is slidably connected to the limiting block 3453, and a circular channel is formed in the slide 2 3452 through the limiting block 3453, wherein the lower end of the slide 2 3452 is a slope 1 3454 inclined downward, and the side of the limiting block 3453 corresponding to the slope 1 3454 is a slope 2, the inner tube 342 is nested in the outer tube 341, and a cylindrical slider 3421 is provided on the wall of the inner tube 342, one end of the cylindrical slider 3421 is inserted into the limiting slide groove 345, and one end of the initial cylindrical slider 3421 is located at the lower end of the slide 1 3451, and the lower end of the inner tube 342 is located at the lower end of the inner tube 342. A drain port 2 is provided on the vertical wall surface at the end, and the drain port 1 and the drain port 2 are staggered by 90 degrees, thereby blocking the inside of the liquid storage shell 2 33. When the drain port 1 and the drain port 2 coincide with each other, the liquid storage shell 2 33 is connected to the wet fermentation chamber 1-2. The floating block 2 344 is located in the liquid storage shell 2 33 and is connected to the upper end of the inner tube 342. A hydraulic spring rod 333 is further provided at the upper end of the interior of the liquid storage shell 2 33. The lower end of the hydraulic spring rod 333 is rotatably connected to the top surface of the floating block 2 344. The torsion spring 343 surrounds the outer tube 341. One end of the torsion spring 343 is connected to the floating block 2 344, and the other end is connected to the inner wall of the liquid storage shell 2 33. The stress of the hydraulic spring rod 333 is greater than that of the torsion spring 343, and the buoyancy of the floating block 2 344 is greater than that of the hydraulic spring rod 333.

[0027] One end of the circulation pipe 4 is connected to the biogas slurry storage space, and the other end is connected to the liquid storage shell 1 32 through a hose 42. The communication port 331 of the liquid storage shell 2 33 is opposite to the connection point between the hose 42 and the liquid storage shell 1 32, wherein the drain port 321 is located above the connection point between the hose 42 and the liquid storage shell 1 32. A circulation pump 41 is connected to the circulation pipe 4.

[0028] Working principle of the invention:

[0029] When the materials in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2 need to be stirred, the circulation pipe 4 extracts the biogas slurry from the biogas slurry storage space through the circulation pump 41. Figure 7As shown, the biogas slurry enters the second liquid storage shell 33 along the circulation pipe 4, and the liquid level in the second liquid storage shell 33 rises, driving the second floating block 344 to rise, the hydraulic elastic rod 333 is compressed, and the biogas slurry level in the wet fermentation chamber 1-2 drops, so that the liquid storage mechanism 3 drops accordingly, and the screw 21 is driven to rotate by the nut 311, that is, the stirring blade 1 22 and the stirring blade 23 are driven to rotate, so as to achieve stirring of the materials in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2. When the floating block 2 344 rises to a certain height, the circulation pump 41 stops, and the cylindrical slider 3421 is now located at the upper end of the slideway 2 3452, and is reset by the torsion spring 343 to drive the inner tube 342 to rotate ninety degrees. When the discharge port 1 and the discharge port 2 coincide with each other, the biogas slurry flows into the wet fermentation chamber 1-2 again, and is driven by the hydraulic elastic rod 333 The inner tube 342 slowly descends, so that there is enough time for the biogas slurry to flow out. During the extension and reset process of the hydraulic elastic rod 333, the cylindrical slider 3421 fits the slope 1 3454 and the slope 2. The cylindrical slider 3421 pushes the limit block 3453 through the slope 2 to allow the cylindrical slider 3421 to pass. The cylindrical slider 3421 reverses ninety degrees along the slope 1 3454, so that the drainage port 1 and the drainage port 2 are staggered again, blocking the liquid storage shell 2 33. Finally, the cylindrical slider 3421 moves to the lower end of the slide 1 3451 for limiting. As the biogas slurry is discharged, the biogas slurry level in the wet fermentation chamber 1-2 rises, and the liquid storage mechanism 3 rises with the liquid level, thereby driving the screw 21 to rotate again through the nut 311 to stir the materials in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2 again.

[0030] When the biogas slurry in the wet fermentation chamber 1-2 is fermented, the electric butterfly valve 16 is opened to discharge the biogas slurry and biogas residue. A certain amount of biogas slurry is retained in the biogas slurry storage space. This biogas slurry is used to inoculate the straw in the dry fermentation chamber 1-1. At this time, the floating block 35 loses its buoyancy, and the liquid storage mechanism 3 moves downward. Figure 8As shown, the limiting baffle 24 limits the descending depth of the feeding plate 31, and the liquid storage shell 1 32 slides downward to the lower end of the chute opened by the baffle 312, and the baffle 312 blocks the drain port 321. At this time, the feeding plate 31 and the liquid storage shell 1 32 are staggered, and the straw in the dry fermentation chamber 1-1 slides into the wet fermentation chamber 1-2 along the axial through-hole of the feeding plate 31. The liquid storage shell 2 33 descends, and the compression spring 323 naturally expands, and the internal space of the liquid storage shell 1 32 is opened. At this time, the top surface of the liquid storage shell 2 33 is the bottom surface of the liquid storage shell 1 32, the circulating pump 41 is started, and the biogas slurry is injected into the liquid storage shell 1 32, and then the electric butterfly valve 16 is closed, and the mixed liquid is injected into the wet fermentation chamber 1-2 through the liquid inlet pipe 13. The liquid is combined, and the liquid level in the wet fermentation chamber 1-2 continues to rise. First, it rises through the floating block 135, driving the liquid storage shell 132 and the liquid storage shell 23 to rise. After the liquid storage shell 132 rises, the discharge port 321 is located in the dry fermentation chamber 1-1, and then the liquid storage shell 2 33 continues to rise, and the compression spring 323 is compressed. The biogas slurry in the liquid storage shell 132 is discharged into the dry fermentation chamber 1-1 along the discharge port 321, and finally, the supporting plate 334 drives the receiving plate 31 and the liquid storage shell 132 to rise to the initial height, the cover 11 is opened, and the straw is put in. Then, through the above actions, the stirring blade 122 and the stirring blade 22 stir the materials in the dry fermentation chamber 1-1 and the wet fermentation chamber 1-2.

Claims

1. An anaerobic fermentation reactor comprising: A tank body (1), a stirring mechanism (2), a liquid storage mechanism (3), a circulation pipe (4), and an auger (5); characterized in that: the tank body (1) is divided into a dry fermentation chamber (1-1) and a wet fermentation chamber (1-2); a partition (12) is provided at the lower end of the wet fermentation chamber (1-2); a certain space is left between the partition (12) and the inner wall of the wet fermentation chamber (1-2); this space is a biogas slurry storage space; a gap is provided on the wall surface of the partition (12); the lower end of the wet fermentation chamber (1-2) is connected to the auger (5) through an electric butterfly valve (16); the wet fermentation chamber (1-2) is connected to a liquid inlet pipe (13); the upper ends of the dry fermentation chamber (1-1) and the wet fermentation chamber (1-2) are respectively provided with an exhaust pipe 1 (14) and an exhaust pipe 2 (15); the exhaust pipe 1 (14) is connected to the exhaust pipe 2 (15); The stirring mechanism (2) is multiple in number and comprises: a screw (21), a stirring blade (22), and a stirring blade (23). The screw (21) is vertically arranged in the tank body (1). The screw (21) is provided with a strip groove (211). The stirring blade (22) is multiple in number. The multiple stirring blades (22) are fixed to the sleeve (221). The inner wall of the sleeve (221) is provided with a slider (222). The sleeve (221) is nested in the screw (21). The slider (222) is engaged in the strip groove (211). The stirring blade (23) is multiple in number. The multiple stirring blades (23) are fixed to the screw (21). A limit baffle (24) is provided on the screw (21). The liquid storage mechanism (3) comprises: a receiving plate (31), a liquid storage shell (1) (32), a liquid storage shell (2) (33), a valve (34), and a floating block (35). The receiving plate (31) is annular and is arranged downwardly along the axis of the tank body (1). A plurality of nuts (311) are arranged at the edge of the receiving plate (31). The plurality of nuts (311) are respectively engaged with the plurality of screw rods (21). A plurality of baffles (312) facing downwardly are arranged on the bottom surface of the receiving plate (31). The liquid storage shell (1) (32) is slidably arranged in the receiving plate (31). The lower end of the liquid storage shell (1) (32) is open. A liquid discharge port (321) and an air port (322) are provided on the wall surface of the liquid storage shell (1). The liquid storage shell (2) (33) is arranged on the liquid storage shell (1). The interior of the liquid storage shell (32) is connected to the liquid storage shell (33) through the compression spring (323). The combined weight of the material receiving plate (31) and the liquid storage shell (32) is greater than the stress of the compression spring (323). A connecting port (331) is provided on one side wall of the liquid storage shell (33). The top surface of the liquid storage shell (33) is connected with an air pipe (332). The air pipe (332) passes through the liquid storage shell (32) upward. A supporting plate (334) is provided at the lower end of the liquid storage shell (33). The supporting plate (334) is in contact with the bottom surface of the liquid storage shell (32) and the plurality of baffles (312). The valve (34) is provided at the lower end of the liquid storage shell (33). The floating block (35) is provided on the bottom surface of the liquid storage shell (33). One end of the circulation pipe (4) is connected to the biogas slurry storage space, and the other end is connected to the liquid storage housing (32) through a hose (42). The communication port (331) is opposite to the connection point between the hose (42) and the liquid storage housing (32). A circulation pump (41) is connected to the circulation pipe (4).

2. An anaerobic fermentation reactor according to claim 1, characterized in that: The valve (34) comprises: an outer tube (341), an inner tube (342), a torsion spring (343), and a second floating block (344). The upper end of the outer tube (341) is located inside the second liquid storage shell (33). A liquid discharge port 1 is provided on the vertical wall surface of the upper end of the outer tube (341). A limiting slide groove (345) is provided at the lower end of the outer tube (341). The limiting slide groove (345) is composed of a slideway 1 (3451) and a slideway 2 (3452) connected to each other end to end. The width of the second slideway (3452) is greater than that of the first slideway (3451), and the center of the second slideway (3452) is connected to the limiting block (3453) in a sliding manner. A circular channel is formed in the second slideway (3452) through the limiting block (3453), wherein the lower end of the second slideway (3452) is a slope surface 1 (3454) inclined downward, and the side of the limiting block (3453) corresponding to the slope surface 1 (3454) is a slope surface 2, and the inner tube (342) is nested in the outer tube (341), and the inner tube ( 342) is provided with a cylindrical slider (3421), one end of the cylindrical slider (3421) is inserted into the limiting slide groove (345), and one end of the initial cylindrical slider (3421) is located at the lower end of the slideway (3451), and a drain port 2 is provided on the vertical wall surface of the lower end of the inner tube (342), and the drain port 1 and the drain port 2 are staggered at 90 degrees. The floating block 2 (344) is located in the liquid storage shell 2 (33) and is connected to the upper end of the inner tube (342). The liquid storage shell 2 A hydraulic spring rod (333) is also provided at the upper end of the interior (33), the lower end of the hydraulic spring rod (333) is rotatably connected to the top surface of the second floating block (344), the torsion spring (343) surrounds the outer tube (341), one end of the torsion spring (343) is connected to the second floating block (344), and the other end is connected to the inner wall of the second liquid storage shell (33), wherein the stress of the hydraulic spring rod (333) is greater than that of the torsion spring (343), and the buoyancy of the second floating block (344) is greater than that of the hydraulic spring rod (333).

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