Wet anaerobic fermentation reactor

Abstract

The invention relates to the technical field of anaerobic fermentation, in particular to a wet anaerobic fermentation reactor which comprises a tank body, a liquid storage tank, a lifting shell, a liquid inlet group, a supporting mechanism, a switch group and a liquid discharge pipeline, the lifting shell ascends to expand the upper space, so that the upper space absorbs biogas slurry through negative pressure, the biogas slurry is continuously injected into the liquid storage tank, the weight of the liquid storage tank is continuously increased, the liquid storage tank descends, the lifting shell is downwards pressed to descend, a hydraulic elastic rod is stretched, and the biogas slurry is discharged in the descending and ascending process of the liquid storage tank; the electric energy consumed by the electromagnetic valve is very little, and compared with mechanical stirring and circulating pump stirring, the straw anaerobic fermentation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic fermentation, and particularly to a wet anaerobic fermentation reactor. Background Art

[0002] The anaerobic fermentation process requires continuous and effective stirring to ensure the homogeneity of the materials in the anaerobic fermentation tank, promote heat conduction, and ensure full contact between the microorganisms in the fermentation tank and the fermentation materials, as well as the rapid dispersion and ultimate degradation of intermediate process products.

[0003] The existing stirring methods mostly use mechanical stirring or a circulating pump to drive the circulation of biogas slurry for stirring. Mechanical stirring requires external power to drive the blades for stirring, which has high energy consumption. The method of using a circulating pump to drive the circulation of biogas slurry has lower energy consumption compared to mechanical stirring, but still requires electric energy to be supplied to the circulating pump. The above two stirring methods consume electric energy, which undoubtedly increases the cost of straw anaerobic fermentation. Summary of the Invention

[0004] Therefore, the present invention is made in view of the above problems. The object of the present invention is a wet anaerobic fermentation reactor, which absorbs biogas slurry under negative pressure and then discharges the biogas slurry to make the biogas slurry flow up and down to achieve the purpose of stirring the biogas slurry. The present invention realizes the above object through the following technical solutions: A wet anaerobic fermentation reactor, comprising: a tank body, a liquid storage tank, a lifting housing, a liquid inlet group, a support mechanism, a switch group, and a liquid discharge pipeline; The liquid storage tank is arranged in the tank body. The liquid storage tank is annular. A first communication port is opened on the vertical wall surface inside the liquid storage tank. A support plate is arranged at the edge of the liquid storage tank. An opening is opened on the support plate. A plurality of sleeves are arranged on the bottom surface of the liquid storage tank. The floating block is located below the liquid level. An air inlet pipeline is arranged on the top surface of the liquid storage tank. An electromagnetic valve is arranged on the air inlet pipeline. A feed pipeline is communicated with the top surface of the liquid storage tank. An electric butterfly valve II is arranged on the feed pipeline. The connection between the feed pipeline and the top surface of the liquid storage tank is a telescopic pipe; The lifting housing is nested in the liquid storage tank. A second communication port is opened on the outer wall of the lifting housing. The second communication port is opposite to the first communication port. A communication pipeline is arranged on the top surface of the lifting housing. The communication pipeline communicates the lifting housing and the liquid storage tank. An air port is opened at the lower end of the lifting housing. A horizontally extending lower pressing plate is further arranged at the lower end of the lifting housing; The liquid inlet group includes a partition plate, a liquid inlet pipe, a fixed pipe, and a baffle. The partition plate is arranged inside the lifting housing, and the partition plate divides the lifting housing into a lower space and an upper space. A hydraulic spring rod is arranged in the lower space, and the stress of the hydraulic spring rod is less than the weight of the liquid storage tank. The upper end of the liquid inlet pipe penetrates through the partition plate and communicates with the upper space, and the lower end of the liquid inlet pipe penetrates through the lifting housing and extends into the biogas slurry. The upper end of the fixed pipe is fixed to the inner top surface of the tank body, and the lower end of the fixed pipe penetrates through the top surface of the lifting housing and is connected to the partition plate. A liquid inlet is arranged at the connection between the fixed pipe and the partition plate. A baffle is arranged at the edge of the partition plate. The baffle is in an inverted "L" shape, and the vertical section of the baffle is located inside the liquid storage tank. The support mechanism is used to support the liquid storage tank with a certain weight; The number of the liquid discharge pipes is the same as that of the multiple sleeves. The upper ends of the multiple liquid discharge pipes respectively extend into the multiple sleeves. A liquid discharge port is arranged on the liquid discharge pipe, and the lower end depth of the liquid discharge pipe is greater than the lower end depth of the liquid inlet pipe.

[0005] Preferably, the number of the support mechanisms is at least four, and they are arranged equidistantly along the axis of the tank body. The support mechanism includes a rotating shaft, a collar, a torsion spring, and a support part. The rotating shaft is polygonal, and both ends of the rotating shaft are rotatably connected to the inner wall of the tank body. The collar is nested on the rotating shaft. An arc-shaped chute is arranged on the collar. One end of the torsion spring is connected to the side wall of the collar, and the other end is connected to the inner wall of the tank body. The stress of the torsion spring is greater than the buoyancy of the floating block. The support part is composed of a connecting ring and a support block. The connecting ring wraps the collar. A slider is arranged on the inner periphery of the connecting ring, and the slider engages into the arc-shaped chute. The support block is inclined, and the upper end of the support block supports the tray. The upper end of the support block is an arc-shaped surface.

[0006] Preferably, the switch group is composed of an upper switch and a lower switch. The upper switch and the lower switch are respectively connected to the inner wall of the tank body. The distance between the upper switch and the lower switch is less than the distance of the up and down movement of the liquid storage tank. The upper switch is used to control the closing of the solenoid valve, and the lower switch is used to control the opening of the solenoid valve.

[0007] Advantages of the present invention: In the present invention, the lifting housing rises to expand the upper space, so that the upper space absorbs biogas slurry through negative pressure. As the biogas slurry is continuously injected into the liquid storage tank, the weight of the liquid storage tank continuously increases, the liquid storage tank descends, and presses down the lifting housing to descend, stretching the hydraulic spring rod. During the up and down movement of the liquid storage tank, the biogas slurry is discharged, so that the biogas slurry circulates up and down, realizing the stirring of the biogas slurry. The electric energy consumed by the solenoid valve is extremely small. Compared with mechanical stirring and circulating pump stirring, the cost of straw anaerobic fermentation is reduced. Description of the drawings

[0008] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0009] Figure 2 This is a schematic cross-sectional structure diagram of the present invention.

[0010] Figure 3 This is a top view of the liquid storage tank of the present invention.

[0011] Figure 4 This is a schematic structural diagram of the liquid inlet group of the present invention.

[0012] Figure 5 This is a schematic structural diagram of the support mechanism of the present invention.

[0013] Figure 6 This is a schematic diagram of the upward movement of the lifting housing of the present invention.

[0014] Figure 7 This is a schematic diagram of the downward movement of the liquid storage tank driving the lifting housing of the present invention.

[0015] Figure 8 This is a schematic diagram of the upward flipping of the support part of the present invention. Detailed implementation manners

[0016] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those of ordinary skill in the art in the prior art of the field to which the invention belongs can easily implement these embodiments. However, the present invention can 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, components not connected to the invention will be omitted from the drawings.

[0017] As Figure 1-2 shown, a wet anaerobic fermentation reactor includes: a tank body 1, a liquid storage tank 2, a lifting housing 3, a liquid inlet group 4, a support mechanism 5, a switch group 6, and a drain pipe 7; The lower end of the tank body 1 is in a leaky shape, and a discharge pipe 11 is connected to the lower end of the tank body 1. An electric butterfly valve 111 is provided on the discharge pipe 11. When the electric butterfly valve 111 is opened, the digested slurry and digested residue in the tank body 1 are discharged along the discharge pipe 11. An exhaust pipe 12 is connected to the upper end of the tank body 1, and the exhaust pipe 12 is used to discharge the biogas generated during the fermentation process; The liquid storage tank 2 is arranged in the tank body 1, above the liquid level in the tank body 1. The liquid storage tank 2 is annular. A first communication port 25 is opened on the vertical wall surface of the inner circumference of the liquid storage tank 2. As Figure 3As shown in the figure, a support plate 26 that fits against the inner wall of the tank body 1 is provided at the edge of the liquid storage tank 2. Specifically, the support plate 26 is attached to the inner wall of the tank body 1 through a rubber layer. An opening 27 is provided on the support plate 26, and the opening 27 is used to connect the spaces above and below the liquid storage tank 2. A plurality of sleeves 21 are provided on the bottom surface of the liquid storage tank 2, and the plurality of sleeves 21 are arranged along the axis of the tank body 1. Floating blocks 22 are respectively provided at the lower ends of the plurality of sleeves 21. The floating blocks 22 are restricted by the height of the liquid storage tank 2 so that the floating blocks 22 are located below the liquid level. The purpose is that after the liquid level drops, the floating blocks 22 always remain below the liquid level, and the floating blocks 22 can continue to support the liquid storage tank 2 without changing the height. An air inlet pipe 23 is provided on the top surface of the liquid storage tank 2, and a solenoid valve 231 is provided on the air inlet pipe 23. The top surface of the liquid storage tank 2 is connected to a feed pipe 13, and an electric butterfly valve II 131 is provided on the feed pipe 13. The connection between the feed pipe 13 and the top surface of the liquid storage tank 2 is a telescopic pipe. The feed pipe 13 conveys a mixed liquid (i.e., straw, poultry manure, hot water) into the liquid storage tank 2; The lifting housing 3 is nested inside the liquid storage tank 2. The outer wall of the lifting housing 3 is attached to the inner wall of the liquid storage tank 2 through a rubber layer. A second communication port 31 is provided on the outer wall of the lifting housing 3, and the second communication port 31 is opposite to the first communication port 25, so that the inside of the lifting housing 3 is connected to the inside of the liquid storage tank 2. A communication pipe 24 is provided on the top surface of the lifting housing 3. The communication pipe 24 is a flexible pipe, and both ends of the communication pipe 24 are respectively connected to the top surfaces of the lifting housing 3 and the liquid storage tank 2. An air port 32 is provided at the lower end of the lifting housing 3, and a horizontally extending lower pressing plate 34 is also provided at the lower end of the lifting housing 3; As Figure 4As shown in the figure, the liquid inlet group 4 includes a partition plate 41, a liquid inlet pipe 42, a fixed pipe 43, and a baffle 44. The partition plate 41 is arranged inside the lifting housing 3. The partition plate 41 is frustum-shaped, with the diameter above the partition plate 41 smaller than that below. The lifting housing 3 is divided into a lower space 3-1 and an upper space 3-2 by the partition plate 41. A hydraulic spring rod 33 is arranged in the lower space 3-1. Both ends of the hydraulic spring rod 33 are connected to the lifting housing 3 and the partition plate 41. The stress of the hydraulic spring rod 33 is less than the weight of the liquid storage tank 2. The upper end of the liquid inlet pipe 42 penetrates through the partition plate 41 and communicates with the upper space 3-2. The lower end of the liquid inlet pipe 42 penetrates through the lifting housing 3 and extends into the biogas slurry, so that the upper space 3-2 is connected to the tank body 1 through the liquid inlet pipe 42. The upper end of the fixed pipe 43 is fixed to the inner top surface of the tank body 1. The lower end of the fixed pipe 43 penetrates through the top surface of the lifting housing 3 and is connected to the partition plate 41. A liquid inlet 431 is arranged at the connection between the fixed pipe 43 and the partition plate 41. A baffle 44 is arranged at the edge of the partition plate 41. The baffle 44 is in an inverted "L" shape. One end of the horizontal section of the baffle 44 is connected to the partition plate 41, and the other end extends into the liquid storage tank 2 along the second communication port 31 and the first communication port 25. The width of the vertical section of the baffle 44 is greater than that of the first communication port 25, and the lower end of the vertical section of the baffle 44 is in contact with the inner bottom surface of the liquid storage tank 2, thereby limiting the maximum rising height of the liquid storage tank 2. When the liquid storage tank 2 descends, the vertical end of the baffle 44 covers part of the first communication port 25 to prevent biogas slurry from flowing into the lower space 3-1; The number of the support mechanisms 5 is at least four and is arranged equidistantly along the axis of the tank body 1, as Figure 5As shown, the support mechanism 5 includes: a rotating shaft 51, a collar 52, a torsion spring 53, and a support portion 54. The rotating shaft 51 is polygonal, and both ends of the rotating shaft 51 are rotatably connected to the inner wall of the tank body 1. The collar 52 is nested on the rotating shaft 51. An arc-shaped chute 521 is provided on the collar 52. One end of the torsion spring 53 is connected to the side wall of the collar 52, and the other end is connected to the inner wall of the tank body 1. The stress of the torsion spring 53 is greater than the buoyancy of the floating block 22. The support portion 54 is composed of a connecting ring 541 and a support block 542. The connecting ring 541 wraps the collar 52. A slider 5411 is provided on the inner periphery of the connecting ring 541. The slider 5411 engages into the arc-shaped chute 521. Initially, the slider 5411 is located at the lower end of the arc-shaped chute 521. The support block 542 is inclined. The upper end of the support block 542 supports the support plate 26. The upper end of the support block 542 is an arc-shaped surface. The support mechanism 5 provides a certain support force for the liquid storage tank 2. The purpose is to allow more biogas slurry to be stored in the liquid storage tank 2. When the biogas slurry in the liquid storage tank 2 reaches a certain amount, that is, when the weight of the liquid storage tank 2 increases by a certain amount, the liquid storage tank 2 overcomes the stress of the torsion spring 53, the support block 542 flips downward, and the liquid storage tank 2 moves downward. When the liquid storage tank 2 resets upward, the support plate 26 pushes the support block 542 to flip upward. When the support plate 26 moves above the support block 542, the support block 542 flips downward by gravity to the initial state; The number of the drain pipes 7 is the same as that of the multiple sleeves 21. The upper ends of the multiple drain pipes 7 respectively extend into the multiple sleeves 21, and the drain pipes 7 are in contact with the wall surfaces of the sleeves 21 through rubber layers. A drain port 71 is provided in the middle of a section of the drain pipe 7 located inside the sleeve 21. The drain port 71 is strip-shaped. The lower ends of the multiple drain pipes 7 are respectively fixed to the inner wall of the tank body 1 through a cross plate 72. The lower end depth of the drain pipe 7 is greater than the lower end depth of the liquid inlet pipe 42; The switch group 6 is composed of an upper switch 61 and a lower switch 62. The upper switch 61 and the lower switch 62 are respectively connected to the inner wall of the tank body 1. The distance between the upper switch 61 and the lower switch 62 is less than the distance of the up and down movement of the liquid storage tank 2. The upper switch 61 is used to control the closing of the solenoid valve 231, and the lower switch 62 is used to control the opening of the solenoid valve 231. When the liquid storage tank 2 rises to the maximum height, the support plate 26 triggers the upper switch 61 to close the solenoid valve 26. When the liquid storage tank 2 drops to the maximum depth, the support plate 26 triggers the lower switch 61 to open the solenoid valve 26.

[0018] Working principle of the invention: The liquid storage tank 2 is at the maximum height, the support plate 26 triggers the upper switch 61 to close the solenoid valve 26, as Figure 6As shown, the hydraulic spring 33 contracts and resets to pull the lifting housing 3 upward, thereby expanding the upper space 3-2 and shrinking the lower space 3-1. The gas in the lower space 3-1 is discharged along the air port 32. Since the upper space 3-2 expands, negative pressure is generated, and the biogas slurry in the tank body 1 is absorbed through the liquid inlet pipe 42. The biogas slurry enters the upper space 3-2. Since the density of the biogas slurry is greater than that of the gas, the biogas slurry flows downward along the second communication port 31 and the first communication port 25 into the liquid storage tank 2. The gas in the liquid storage tank 2 enters the upper space 3-2 along the communication pipeline 24 to supplement the expanded upper space 3-2. As the biogas slurry is continuously injected, its weight continuously increases, and the liquid storage tank 2 descends. The support mechanism 5 continues to support the liquid storage tank 2. When the biogas slurry is further injected, that is, the weight of the liquid storage tank 2 further increases, the liquid storage tank 2 overcomes the stress of the torsion spring 53, as Figure 7 shown, the liquid storage tank 2 moves downward. The liquid storage tank 2 drives the lifting housing 3 to move downward through the lower pressing plate 34, and the hydraulic spring rod 33 is stretched. The upper space 3-2 shrinks, and the gas in the upper space 3-2 is discharged into the tank body 1 along the liquid inlet pipe 42. Then, the liquid discharge port 71 of the liquid discharge pipeline 7 is communicated with the inside of the liquid storage tank 2. During the shrinking process of the upper space 3-2, the gas enters the liquid storage tank 2, and the biogas slurry in the liquid storage tank 2 is discharged into the tank body 1 along the liquid discharge port 71. Since part of the gas in the upper space 3-2 is discharged in advance, a certain amount of biogas slurry is retained inside when the liquid storage tank 2 descends to the maximum depth. The combined weight of the retained biogas slurry and the liquid storage tank 2 is greater than the buoyancy of the floating block 22. The liquid storage tank 2 descends to the maximum depth and triggers the lower switch 62, and the solenoid valve 23 opens. The liquid storage tank 2 intakes air, and the retained biogas slurry flows out along the liquid discharge port 71. As the weight of the liquid storage tank 2 continuously decreases, the floating block 22 drives the liquid storage tank 2 to rise. During the rising process, the liquid storage tank 2 discharges the internal biogas slurry to accurately return the liquid storage tank 2 to the maximum height. Since the liquid storage tank 2 rises through the floating block 22 and the lifting housing 3 rises through the hydraulic spring rod 33, the rising speed of the liquid storage tank 2 is faster than that of the lifting housing 3, as Figure 8 shown, during the rising process of the liquid storage tank 2, the supporting plate 26 pushes up the supporting block 542, causing the supporting block 542 to flip upward. During this process, the slider 5411 moves toward the upper end of the arc-shaped chute 521, so that the torsion spring 53 does not act on the supporting block 542. When the supporting plate 26 moves above the supporting block 542, the supporting block 542 flips downward to its initial state by gravity. When the liquid storage tank 2 reaches the maximum height, the supporting plate 26 triggers the upper switch 61, and the solenoid valve 231 closes. The lifting housing 3 rises through the hydraulic spring rod 33, repeating the above actions to suck the liquid, so that the biogas slurry in the tank body 1 circulates up and down to stir the biogas slurry.

[0019] When it is necessary to discharge the fermented biogas slurry and biogas residue, open the electric butterfly valve 111. The biogas slurry and biogas residue are discharged along the discharge pipe 11, and then close the electric butterfly valve 111. At this time, if the support mechanism 5 supports the liquid storage tank 2 and the electric butterfly valve 131 is opened, the feed pipeline 13 injects the mixed liquid into the liquid storage tank 2. The weight of the liquid storage tank 2 increases, overcoming the stress of the torsion spring 53, and the liquid storage tank 2 moves downward. After the inside of the liquid storage tank 2 is communicated with the liquid discharge port 71, the mixed liquid flows into the tank body 1 along the liquid discharge port 71. Among them, the inflow rate of the mixed liquid into the liquid storage tank 2 is greater than the outflow rate of the liquid storage tank 2, so that the liquid storage tank 2 always remains at the maximum depth. After the injection of the feed pipeline 13 is completed, the electric butterfly valve 131 is closed. When the mixed liquid in the liquid storage tank 2 decreases, the liquid storage tank 2 moves upward, repeating the above actions to complete the up and down flow of the mixed liquid.

Claims

1. A wet anaerobic fermentation reactor, comprising: A wet anaerobic fermentation reactor comprises: a tank body (1), a liquid storage tank (2), a lifting shell (3), a liquid inlet group (4), a supporting mechanism (5), a switch group (6), and a liquid discharge pipe (7); the characteristics are as follows: the liquid storage tank (2) is annular, a connecting port (25) is provided on the vertical wall surface of the inner periphery of the liquid storage tank (2), a supporting plate (26) is provided on the edge of the liquid storage tank (2), an opening (27) is provided on the supporting plate (26), a plurality of sleeves (21) are provided on the bottom surface of the liquid storage tank (2), a floating block (22) is located below the liquid surface, an air inlet pipe (23) is provided on the top surface of the liquid storage tank (2), a solenoid valve (231) is provided on the air inlet pipe (23), the top surface of the liquid storage tank (2) is connected to a feed pipe (13), a second electric butterfly valve (131) is provided on the feed pipe (13), and a telescopic pipe is provided at the connection point between the feed pipe (13) and the top surface of the liquid storage tank (2); The lifting shell (3) is nested in the liquid storage tank (2); a second communication port (31) is provided on the outer wall of the lifting shell (3); the second communication port (31) is opposite to the first communication port (25); a communication pipe (24) is provided on the top surface of the lifting shell (3); the communication pipe (24) connects the lifting shell (3) and the liquid storage tank (2); an air port (32) is provided at the lower end of the lifting shell (3); and a lower pressure plate (34) extending horizontally is also provided at the lower end of the lifting shell (3); The liquid inlet group (4) comprises a partition (41), a liquid inlet pipe (42), a fixed pipe (43), and a baffle (44); the partition (41) is arranged inside the lifting shell (3); a hydraulic spring rod (33) is arranged inside the lifting shell (3); the hydraulic spring rod (33) connects the lifting shell (3) and the partition (41); the stress of the hydraulic spring rod (33) is less than the weight of the liquid storage tank (2); the upper end of the liquid inlet pipe (42) passes through the partition (41) and is connected to the inside of the lifting shell (3); the lower end passes through the lifting shell (3) and extends into the biogas slurry. The upper end of the fixed tube (43) is fixed to the top surface of the tank body (1), and the lower end passes through the top surface of the lifting shell (3) to connect to the partition (41). A liquid inlet (431) is provided at the connection between the fixed tube (43) and the partition (41). A baffle (44) is provided at the edge of the partition (41). The baffle (44) is in an inverted "L" shape. The vertical section of the baffle (44) is located in the liquid storage tank (2). The support mechanism (5) is used to support the liquid storage tank (2) with a certain weight. The switch group (6) is used to control the solenoid valve (231). The number of the drainage pipes (7) is the same as the number of the plurality of sleeves (21), and the upper ends of the plurality of drainage pipes (7) extend into the plurality of sleeves (21) respectively, wherein the drainage pipes (7) are provided with drainage ports (71), and the depth of the lower end of the drainage pipes (7) is greater than the depth of the lower end of the liquid inlet pipe (42).

2. A wet anaerobic fermentation reactor according to claim 1, characterized in that: The number of the support mechanisms (5) is at least four and they are equidistantly arranged along the axis of the tank body (1). The support mechanism (5) comprises: a rotating shaft (51), a collar (52), a torsion spring (53), and a support portion (54). The rotating shaft (51) is polygonal. Both ends of the rotating shaft (51) are rotatably connected to the inner wall of the tank body (1). The collar (52) is nested on the rotating shaft (51). An arc-shaped sliding groove (521) is formed on the collar (52). One end of the torsion spring (53) is connected to the side wall of the collar (52), and the other end is connected to the tank body ( 1) inner wall, the stress of the torsion spring (53) is greater than the buoyancy of the floating block (22), the support portion (54) is composed of a connecting ring (541) and a supporting block (542), the connecting ring (541) wraps the sleeve ring (52), wherein a sliding block (5411) is arranged inside the connecting ring (541), the sliding block (5411) is engaged in the arc-shaped sliding groove (521), the supporting block (542) is inclined, the upper end of the supporting block (542) supports the supporting plate (26), and the upper end of the supporting block (542) is an arc-shaped surface.

3. A wet anaerobic fermentation reactor according to claim 1, characterized in that: The switch group (6) is composed of an upper switch (61) and a lower switch (62). The upper switch (61) and the lower switch (62) are connected to the inner wall of the tank body (1). The distance between the upper switch (61) and the lower switch (62) is smaller than the distance of the liquid storage tank (2) moving up and down. The upper switch (61) is used to control the closing of the solenoid valve (23) (1), and the lower switch (62) is used to control the opening of the solenoid valve (231).

Images