CN115960706A - Laminar flow type stirring device and fermentation tank - Google Patents

Abstract

The application relates to a laminar flow type stirring device and a fermentation tank, relates to the fermentation technology, and comprises a central column, a stirring assembly and a driving assembly, wherein the central column is arranged in the fermentation tank, the stirring assembly comprises a cross beam, a supporting rod and a plurality of blades distributed along the length direction of the supporting rod, and the supporting rod is hung below the cross beam; the crossbeam is provided with drive assembly, drive assembly is used for driving the crossbeam around center post circular motion, the crossbeam rotates to be connected in the center post, the paddle can rotate along with the crossbeam to be used for disturbing the dominant bacterial colony that different height layers correspond in the fermentation cylinder. The utility model provides a stirring subassembly can carry out the layering stirring to the material in the fermentation cylinder, has both guaranteed the mass transfer effect and also can reduce the appearance of the mutual mixing condition of advantage fungus crowd.

Description

Laminar flow type stirring device and fermentation tank

Technical Field

The application relates to a fermentation technology, in particular to a laminar flow type stirring device and a fermentation tank.

Background

Anaerobic fermentation is a process for preparing direct metabolites or secondary metabolites by means of the life activities of microorganisms under anaerobic conditions, and the main application in the aspect of anaerobic fermentation in China at present is the preparation of biogas, so that the reutilization rate of energy is improved. The anaerobic fermentation process is mainly divided into three stages of hydrolysis, acidification and methane production.

The process of the enzymatic hydrolysis of organic substances into small molecular compounds by microorganisms is called hydrolysis stage; the stage of converting small molecule compounds into substances such as organic acids, alcohols, carbon dioxide, hydrogen, amines and the like under the action of the methane-producing microbe groups is called an acidification stage; the process by which the second stage products are broken down into methane and carbon dioxide by the methanogenic bacteria is referred to as the methanogenic stage. The three stages correspond to different advantageous microbial floras, and the three advantageous microbial floras are naturally driven to be layered to form an advantageous fermentation area due to different environments among different height layers in the anaerobic fermentation tank. However, most devices for mechanically stirring and transferring mass in the anaerobic fermentation tank in the prior art adopt full-mixing type mass transfer, the stirrer usually adopts a top-placing type, a side-entering type, a diving type or a mixing type, and the anaerobic fermentation tank stirred by the full-mixing type mass transfer has no obvious stage division, so that the problems of uneven velocity distribution of mass points in a flow field, large ineffective energy occupation ratio, incapability of establishing dominant flora or unobvious dominant flora and large energy consumption exist.

Therefore, the inventors considered that it is highly desirable to provide a stirring device and a fermentation tank capable of achieving inter-level micro-stirring mass transfer.

Disclosure of Invention

In order to make the in-process of stirring mass transfer in the fermentation cylinder, the difficult intermixing of the advantage fungus crowd between the different altitude layers, this application provides a laminar flow formula agitating unit and fermentation cylinder.

A laminar flow agitation apparatus comprising: the central column is arranged in the fermentation tank;

the stirring assembly comprises a cross beam which is rotatably connected to the central column;

the driving assembly is used for driving the cross beam to do circumferential motion around the central column;

the stirring assembly further comprises a supporting rod fixed below the cross beam and a plurality of blades fixedly arranged along the length direction of the supporting rod, and the blades rotate along with the circumferential direction of the cross beam and are used for disturbing the advantageous flora in the height layer corresponding to the blades in the fermentation tank.

In other embodiments, a plurality of support rods are arranged below the cross beam, a plurality of connecting rods are fixed between every two adjacent support rods along the length direction, and at least one blade is fixedly arranged on each connecting rod.

In other embodiments, the paddle is in a strip plate-shaped structure, and the planes of the cross beam and the support rod are intersected with the plate surface of the paddle but not perpendicular to each other.

In other embodiments, at least one internal circulation pump is arranged on the cross beam, the internal circulation pump comprises at least two conveying units arranged at intervals along the axial direction, and each conveying unit comprises a spiral shaft and a sleeve.

In other embodiments, the internal circulation pump further comprises a spacing unit arranged between the two conveying units, and the spacing unit comprises a connecting shaft and a supporting tube, wherein two ends of the connecting shaft are respectively connected to two adjacent spiral shafts, and the supporting tube is sleeved outside the connecting shaft.

In other embodiments, the driving assembly comprises a hydraulic motor and a driving wheel, the hydraulic motor is fixed at one end of the cross beam far away from the central column, and an output shaft of the hydraulic motor is connected with the driving wheel.

In other embodiments, a shell breaker is fixedly arranged on the cross beam, and the shell breaker is provided with at least one tip for breaking shells.

The fermentation tank comprises a tank body, wherein the laminar flow type stirring device is arranged in the tank body.

In other embodiments, a sand cleaning assembly is arranged in the tank body, the sand cleaning assembly comprises a sand breaking part and a sand conveying part, the sand breaking part comprises a screw rod and a driving motor, the screw rod is rotatably connected to the lower end of the support rod, and the driving motor is connected to the support rod and is used for driving the screw rod to rotate; the sand conveying piece comprises a spiral conveyor, and the spiral conveyor is used for conveying settled sand pushed by a spiral rod to the outside of the tank body.

In other embodiments, the sand conveying part further comprises a sand collecting barrel used for collecting settled sand, the screw conveyer is communicated with the sand collecting barrel, the central column is provided with a sand scraper, the sand scraper comprises a driven ring, a sand scraping plate and a driving part, the driven ring is rotatably connected to the central column, the driving part is connected to the supporting rod and used for driving the driven ring to rotate, the sand scraping plate is connected to the lower end face of the driven ring, and the sand scraping plate is used for sweeping the settled sand into the sand collecting barrel.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the driving assembly can drive the cross beam to move around the center column in a circular mode, the rail can provide supporting force for the cross beam, stability in the rotating or swinging process of the cross beam is improved, the supporting rod can drive the blades to disturb materials in the fermentation tank in the rotating process of the cross beam, the mass transfer effect of the materials in the fermentation tank is improved, vortex and movement in the vertical direction are not generated in the process that the blades horizontally disturb the materials, and different dominant bacterial groups are not prone to being mixed; in addition, the internal circulation pump can convey flora in high-density areas among different height layers to a low-density area, and the paddle can be matched with the internal circulation pump, so that the conveyed flora is rapidly dispersed, the density of the flora among the same height layers is improved, and the fermentation efficiency is improved;

2. the hob can break open and promote near the receipts sand section of thick bamboo opening with the grit of jar body bottom to by the rotation of driving part drive sand scraper, scrape into in receiving a sand section of thick bamboo near the grit of receiving a sand section of thick bamboo, carry to jar external by screw conveyer at last, except that the sand effect is better, and gathers the grit through receiving a sand section of thick bamboo and unified clear away the together exhaust condition of reducible jar internal material along with the grit, reduce the waste of raw materials.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

FIG. 2 is a schematic view of a partial structure of a can body according to an embodiment of the present disclosure.

FIG. 3 is a schematic structural diagram of a laminar flow type stirring apparatus according to an embodiment of the present application.

Fig. 4 is an enlarged schematic view of a portion a and a portion B in fig. 2.

Fig. 5 is a schematic structural view of an internal circulation pump according to an embodiment of the present application.

Description of the reference numerals: 1. a central column; 11. a hydraulic oil distributor; 101. a track; 2. a stirring assembly; 21. a cross beam; 211. a shell breaker; 22. a support bar; 221. a connecting rod; 23. a paddle; 3. a drive assembly; 31. a hydraulic motor; 32. a drive wheel; 4. an internal circulation pump; 41. a drive member; 42. a conveying unit; 421. a screw shaft; 422. a sleeve; 423. a connecting strip; 43. a spacing unit; 431. a connecting shaft; 432. a blocking disk; 433. supporting a pipe; 5. a tank body; 51. a feed pipe; 52. a discharge pipe; 6. a sand removal assembly; 61. a sand breaking part; 611. a screw rod; 612. a drive motor; 613. breaking sand teeth; 62. a sand feeding part; 621. a sand collecting cylinder; 622. a screw conveyor; 63. a sand scraper; 631. a driven ring; 632. a sand scraping plate; 6311. a ring sheet; 6312. erecting a rod; 633. a driving member; 634. a transmission gear.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses laminar flow formula agitating unit and fermentation cylinder.

Referring to fig. 1, a fermentation tank comprises a tank body 5, wherein the tank body 5 is in a cylindrical structure, and an upper opening of the tank body 5 is sealed and covered with a membrane top so as to contain biogas generated after anaerobic fermentation and lead the biogas out of a biogas collecting device outside the tank body 5 in time. Referring to fig. 2 and 3, a laminar stirring device is arranged in the tank 5, and the laminar stirring device comprises a central column 1, a stirring assembly 2 and a driving assembly 3. The central column 1 is vertically fixed at the bottom of the tank body 5 and has the same central axis with the tank body 5. Stirring subassembly 2 includes crossbeam 21, bracing piece 22 and a plurality of paddle 23, crossbeam 21 can rotate through the bearing frame and connect in the upper end of center post 1, the middle part of crossbeam 21 also can directly rotate the connection and install in center post 1 upper end, bracing piece 22 one end is hung and is located the below of crossbeam 21, a plurality of paddles 23 are fixed in bracing piece 22 and are distributed along the length direction of bracing piece 22, so that crossbeam 21 is the same horizontal circumferential motion of circular motion in-process around center post 1 and can drive bracing piece 22 and paddle 23, the paddle 23 horizontal disturbance of not co-altitude is the dominant fungus crowd on the corresponding high layer in the jar body 5, and do not produce the change of vortex or axial height when paddle 23 removes, then be difficult to mix the dominant fungus crowd of difference.

In order to improve the stirring effect of stirring subassembly 2 to the material of jar 5 internal homostorey scope, set up a plurality of bracing pieces 22 and a plurality of bracing pieces 22 along the length direction equidistance distribution setting of crossbeam 21 in crossbeam 21 below to improve stirring subassembly 2 in the quantity of paddle 23, increase the efficiency of stirring mass transfer. Top-down is provided with a plurality of connecting rods 221 between two adjacent bracing pieces 22, and the both ends of connecting rod 221 weld respectively in two adjacent bracing pieces 22 to improve stirring subassembly 2's overall structure stability. At least one paddle 23 is fixedly arranged on each connecting rod 221 in a penetrating mode, and the dominant flora on the corresponding height layer in the tank body 5 is disturbed horizontally.

In this embodiment, in order to improve the stirring effect of paddle 23, paddle 23 is the vertical setting of the face of bar platelike structure and paddle 23, and the place plane between crossbeam 21 and bracing piece 22 intersects but mutually perpendicular with the face of paddle to make paddle 23 along with the in-process of crossbeam 21 circumferential movement, paddle 23 side surface plays the water conservancy diversion effect, reduces the resistance of paddle 23 disturbance material.

Referring to the enlarged view of the part a in fig. 4, a ring-shaped rail 101 is fixed on the inner wall of the tank 5, the rail 101 and the tank 5 are arranged on the same central axis, the driving assembly 3 is mounted on the cross beam 21 and used for driving the cross beam 21 to rotate around the central column 1, the driving assembly 3 comprises a hydraulic motor 31 and a driving wheel 32, the cylinder of the hydraulic motor 31 is fixed on the cross beam 21, the driving wheel 32 is connected with the output shaft of the hydraulic motor 31, and the driving wheel 32 is arranged on the rail 101. After the hydraulic motor 31 drives the driving wheel 32 to rotate, the driving wheel 32 can run along the contour of the track 101, so as to drive the free end of the cross beam 21 to rotate or swing back and forth on the track 101. It is worth mentioning that the hydraulic motor 31 can be replaced by a driving motor or a pneumatic motor, and because the anaerobic fermentation process needs to reduce the potential safety hazard that ignition spark is generated in the device to detonate the fermentation tank as much as possible, the power source for driving in the embodiment adopts a hydraulic driving mode. The upper end of the central column 1 is provided with a hydraulic oil distributor 11, the hydraulic oil distributor 11 can guide the hydraulic oil outside the tank body 5 into the hydraulic oil distributor 11, and the hydraulic oil distributor 11 distributes the hydraulic oil to the hydraulic motor 31 to provide driving force for the hydraulic motor 31.

In other embodiments, the driving assembly 3 may also include only the hydraulic motor 31, a cylinder of the hydraulic motor 31 is fixed to the upper end of the central column 1, and an output shaft of the hydraulic motor 31 is fixed to the end of the cross beam 21, so that the hydraulic motor 31 can directly drive the cross beam 21 to rotate, in order to reduce the damage of the hydraulic motor 31 caused by a force, one end of the cross beam 21 facing the rail 101 may be connected to a roller, and the other end of the cross beam 21 is connected to the rail 101 in a rolling manner through a roller, thereby reducing the damage of the hydraulic motor 31 caused by the inclination of the cross beam 21.

In some embodiments, a plurality of crust breakers 211 are fixed below the cross beam 21, and the plurality of crust breakers 211 are distributed along the length direction of the cross beam 21. The shell breaking device 211 is provided with two tips, and when the cross beam 21 drives the shell breaking device 211 to rotate, the shell breaking device 211 can break crusts on the liquid level of the material and press the crusts below the liquid level, so that the shell breaking effect is achieved. The inner part of the shell breaking device 211 is provided with a cavity, so that the shell breaking device 211 can provide certain buoyancy for the cross beam 21, and the stress of the cross beam 21 is reduced.

Considering that the feeding process of the conventional fermentation tank can affect the operation of the stirring device, referring to fig. 1, the lower end of the side wall of the tank body 5 of this embodiment is provided with a plurality of feeding pipes 51, the plurality of feeding pipes 51 are distributed along the circumference of the tank body 5, the upper end of the side wall of the tank body 5 is also provided with a plurality of discharging pipes 52, the feeding pipes 51 correspond to the discharging pipes 52 one by one, and the feeding pipes 51 are located right above the discharging pipes 52. In the feeding or discharging process, a worker can open the feeding pipe 51 and the discharging pipe 52 on one corresponding side, and set a stirring program, so that the hydraulic motor 31 can drive the free end of the beam 21 to stir in a reciprocating mode at a position far away from the feeding or discharging, and the stirring program can be changed if the feeding is finished, so that the beam 21 can rotate circumferentially and comprehensively disturb materials in the tank body 5, at the moment, the influence of the feeding process on the laminar flow type stirring device is small, the damage of the laminar flow type stirring device is reduced, and meanwhile, the feeding or discharging can be carried out in the tank body 5 in an uninterrupted mode in turn.

Referring to fig. 5, the cross beam 21 is provided with an internal circulation pump 4, the internal circulation pump 4 includes a driving element 41, two conveying units 42 and a spacing unit 43 arranged between the two conveying units 42, a hydraulic motor is selected for the driving element 41, the driving element 41 is applied to a fermentation tank, the hydraulic motor is preferably selected for the driving element in view of safety performance, the conveying units 42 and the spacing unit 43 are arranged in an axial direction, the conveying unit 42 includes a screw shaft 421 and a sleeve 422, the spacing unit 43 includes a connecting shaft 431, a blocking disc 432 and a supporting pipe 433, the two screw shafts 421 and the connecting shaft 431 are integrally formed and are arranged on the same central axis, the screw shaft 421 is arranged in an inner cavity of the sleeve 422, a gap is left between the screw shaft 421 and the sleeve 422 for conduction of a material, the upper end of the sleeve 422 is fixed to the cross beam 21, a connecting bar 423 is welded to the upper end of the sleeve 422, the driving element 41 is fixed to the sleeve 422 through at least one connecting bar 423, and an output shaft of the driving element 41 is connected to the screw shaft 421, so that the driving element 41 can drive the screw shaft 421 to rotate and push the material into the sleeve 422, thereby realizing the transportation of dominant bacteria colonies in the high-level bacteria colony in the same-level low-density bacteria colony zone, and improving the functional zone of the same-level bacteria colony.

The number of the conveying units 42 and the spacing units 43 can be set according to the number of different floras or different distribution layers in a specific fermentation process.

A plurality of connecting strips 423 are arranged between the supporting tube 433 and two adjacent sleeves 422, one end of each connecting strip 423 is welded on the supporting tube 433, the other end of each connecting strip 423 is welded on the corresponding sleeve 422, and an opening for feeding or discharging is reserved between the supporting tube 433 and the corresponding sleeve 422, so that the supporting tube 433 is positioned between the two sleeves 422 and plays a role in transitional connection, the two conveying units 42 can be spaced apart, and the effect of connecting the two sleeves 422 to increase the structural stability can be achieved. In addition, the connecting shaft 431 penetrates through the blocking disc 432, the blocking disc 432 is located in an inner cavity of the supporting tube 433, the blocking disc 432 is of a disc-shaped structure, the outer side edge of the blocking disc 432 abuts against the inner wall of the supporting tube 433, when materials conveyed upwards from the lower side have a certain upward movement trend and continuously move upwards, the blocking disc 432 can timely block the upward movement trend, the conveying unit 42 above the blocking disc is made to be difficult to suck the materials conveyed below into different flora areas and convey the materials to the different flora areas, and accordingly flora mixing is reduced under the condition that mass transfer of the materials is guaranteed.

The upper end opening of sleeve 422 forms the flash ring, and the flash ring sets up with the sleeve 422 with the central axis, and the flash ring is discoid structure, and its axial cross-section is the horn-shaped structure for when the material was derived from sleeve 422's discharge gate, the inclined plane of flaring form can support and guide the material, made the material can spread along the horizontal direction. The support tube 433 is also provided with an overflow ring at the upper opening, which can block the material that continues to move upward, so that the material moves downward along the outside of the sidewall between the inner circular edge and the outer circular edge. This arrangement can reduce the suction of the dominant bacteria from the feeding port of the feeding unit 42 located above the feeding unit 42 located below the spacing unit 43.

When the internal circulation pump 4 conveys flora in a high-density area between the same height layers to a low-density area, the stirring component 2 can horizontally stir the conveyed high-density flora, so that the density of the flora between the same height layers is increased, and the fermentation efficiency is improved. It should be noted that, since the fermentation process in the embodiment is anaerobic fermentation, the three dominant bacterial communities, i.e., the hydrolytic bacteria, the acidifying bacteria, and the methanogenic bacteria, are layered in sequence along the height direction of the tank 5, and the bacterial communities in the same height layer in the embodiment are located between the height layers where the three dominant bacterial communities are located.

In order to solve the problem of sand setting in the tank 5, as further described with reference to fig. 4, a sand cleaning assembly 6 is disposed in the tank 5, the sand cleaning assembly 6 includes a sand breaking component 61 and a sand feeding component 62, the sand breaking component 61 includes a screw rod 611 and a driving motor 612, the driving motor 612 can selectively use a hydraulic motor or a pneumatic motor, considering that the application environment of the present invention is in a fermentation tank, the driving motor 612 is preferably a hydraulic motor, the screw rod 611 penetrates through and is rotatably connected to the lower end of the support rod 22, the driving motor 612 is fixed to the support rod 22, the screw rod 611 is fixed to the driving motor 612, the driving motor 612 can drive the screw rod 611 to rotate, and during the rotation of the screw rod 611, the screw blade thereof can break the sand setting at the bottom of the tank 5 and gradually push the broken sand to one side for later-stage discharge. Of course, a plurality of screw rods 611 may be provided, and both ends of each screw rod 611 are respectively rotatably connected to two adjacent support rods 22, and the screw rods 611 are connected to each other through a coupling. In addition, in order to improve the sand-breaking effect of the screw rod 611, a plurality of sand-breaking teeth 613 are formed on the outer edge of the screw blade of the screw rod 611.

Send sand 62 including receiving sand section of thick bamboo 621 and screw conveyer 622, receive sand section of thick bamboo 621 and be the open-ended tubbiness structure and center post 1 lower extreme and insert and locate receiving sand section of thick bamboo 621 in, receiving sand section of thick bamboo 621 is located the one end of hob 611 towards center post 1, screw conveyer 622's feed inlet intercommunication receiving sand section of thick bamboo 621 inner chamber, screw conveyer 622's discharge gate sets up in the outside of jar body 5, consequently, after hob 611 promoted the material to receiving sand section of thick bamboo 621, it can carry the sand setting in receiving sand section of thick bamboo 621 to the jar body 5 outside to open screw conveyer 622, accomplish desanding work.

Since the settled sand pushed by the screw 611 is easily scattered near the opening of the sand collecting barrel 621, the sand removing effect is reduced. Therefore, the center post 1 of the present embodiment is provided with the sand scraper 63, the sand scraper 63 includes a driven ring 631, a plurality of sand scraping plates 632, and a driving member 633, and the driving member 633 may adopt the same components as the driving assembly 3, such as a hydraulic motor. In order to improve the compactness of the structure, the driving member 633 can be directly and fixedly connected with the cylinder of the driving motor 612, the driving member 633 can also be fixed on the supporting rod 22, and the output shaft of the driving member 633 is fixed with the transmission gear 634.

The driven ring 631 comprises two ring pieces 6311 with the same structure and a plurality of vertical rods 6312 distributed along the outer ring edge of the ring pieces 6311, the inner ring edge of the driven ring 631 is rotatably connected to the central column 1 and uses the central axis of the central column 1 as a rotation axis, the vertical rods 6312 penetrate through the two ring pieces 6311, and the tooth tops of the transmission gears 634 are inserted between the two adjacent vertical rods 6312 and drive the driven ring 631 to rotate through the transmission of the transmission gears 634. In other embodiments, the driven ring 631 may be directly geared, and the driven ring 631 may be geared with the drive gear 634 such that the drive gear 634 can drive the driven ring 631 to rotate.

The sand scraping plates 632 are in a strip plate structure and fixed on the lower end face of the driven ring 631, the plurality of sand scraping plates 632 radially deviate from the center of the driven ring 631 by taking the central axis of the driven ring 631 as the center, and the length of the sand scraping plates 632 is greater than the radius of the sand collecting cylinder 621. Therefore, when the driven ring 631 is driven by the transmission gear 634 to rotate, the sand scraping plate 632 can scrape settled sand near the sand collecting cylinder 621 into the sand collecting cylinder 621, and the sand collecting efficiency is improved.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A laminar flow agitation apparatus, comprising:

a central column (1) arranged in the fermentation tank;

the stirring assembly (2) comprises a cross beam (21) which is rotatably connected to the central column (1);

the driving assembly (3) is used for driving the cross beam (21) to do circumferential motion around the central column (1);

stirring subassembly (2) still including fixed setting up paddle (23) of crossbeam (21) below, paddle (23) are along with crossbeam (21) circumferential direction for in the disturbance fermentation cylinder the intraformational dominant flora of height that paddle (23) are corresponding.

2. Laminar flow agitation apparatus according to claim 1, characterized in that: a plurality of supporting rods (22) are arranged below the cross beam (21), a plurality of connecting rods (221) are fixed between every two adjacent supporting rods (22) along the length direction, and at least one blade (23) is fixedly arranged on each connecting rod.

3. Laminar flow stirring apparatus according to claim 1, characterized in that: the paddle (23) is of a strip-shaped plate structure, and the planes of the cross beam (21) and the support rod (22) are intersected with the plate surface of the paddle (23) but not mutually perpendicular.

4. Laminar flow agitation apparatus according to claim 1, characterized in that: the cross beam (21) is provided with at least one internal circulation pump (4), the internal circulation pump (4) comprises at least two conveying units (42) which are arranged at intervals along the axial direction, and each conveying unit (42) comprises a spiral shaft (421) and a sleeve (422).

5. Laminar flow stirring apparatus according to claim 4, characterized in that: the internal circulation pump (4) further comprises a spacing unit (43) arranged between the two conveying units (42), wherein the spacing unit (43) comprises a connecting shaft (431) and a supporting pipe (433), two ends of the connecting shaft (431) are respectively connected to the two adjacent spiral shafts (421), and the supporting pipe is sleeved outside the connecting shaft (431).

6. Laminar flow stirring apparatus according to claim 1, characterized in that: the driving assembly (3) comprises a hydraulic motor (31) and a driving wheel (32), the hydraulic motor (31) is fixed at one end, far away from the central column, of the cross beam (21), and an output shaft of the hydraulic motor (31) is connected with the driving wheel (32).

7. Laminar flow agitation apparatus according to claim 1, characterized in that: a shell breaking device (211) is fixedly arranged on the cross beam (21), and at least one tip for breaking shells is arranged on the shell breaking device (211).

8. A fermentation apparatus, comprising: tank (5), in which tank (5) a laminar flow agitation device according to any one of claims 1 to 7 is provided.

9. The fermenter of claim 8, wherein: a sand cleaning assembly (6) is arranged in the tank body (5), the sand cleaning assembly (6) comprises a sand breaking part (61) and a sand feeding part (62), the sand breaking part (61) comprises a screw rod (611) and a driving motor (612), the screw rod (611) is rotatably connected to the lower end of the supporting rod (22), and the driving motor (612) is fixed on the supporting rod (22) and used for driving the screw rod (611) to rotate; the sand conveying piece (62) comprises a screw conveyor (622), and the screw conveyor (622) is used for conveying settled sand pushed by a screw rod (611) to the outside of the tank body (5).

10. The fermenter of claim 9, wherein: send sand part (62) still including a sand collecting cylinder (621) that is used for collecting the sand setting, screw conveyer (622) communicates in sand collecting cylinder (621), center post (1) is provided with scrapes sand ware (63), it includes driven ring (631), sand scraping plate (632) and driving part (633) to scrape sand ware (63), driven ring (631) rotate to be connected in center post (1), driving part (633) are connected in bracing piece (22) and driving part (633) and are used for driving driven ring (631) rotatory, sand scraping plate (632) are connected in the lower terminal surface of driven ring (631), and sand scraping plate (632) are used for sweeping the sand setting into in sand collecting cylinder (621).

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