CN112812940A - Mechanical and pneumatic combined dry anaerobic fermentation system and fermentation method - Google Patents

Mechanical and pneumatic combined dry anaerobic fermentation system and fermentation method Download PDF

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CN112812940A
CN112812940A CN202110152675.8A CN202110152675A CN112812940A CN 112812940 A CN112812940 A CN 112812940A CN 202110152675 A CN202110152675 A CN 202110152675A CN 112812940 A CN112812940 A CN 112812940A
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pneumatic
stirring
horizontal
fermentation
fermentation tank
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CN112812940B (en
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陈静
洪祖喜
王国良
张心良
贾磊
徐文倩
王建翔
吴志平
王振旗
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Shanghai Environmental Protection Co ltd
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Abstract

The invention discloses a dry anaerobic fermentation system with a mechanical pneumatic combination function, which comprises: a horizontal fermentation tank; the mechanical stirring assembly comprises a stirring shaft arranged along the axial direction of the horizontal fermentation tank and a plurality of blades arranged on the stirring shaft; the pneumatic stirring assembly comprises a first pneumatic pipe, a second pneumatic pipe and a gas supply pipeline connected with the first pneumatic pipe and the second pneumatic pipe which are sequentially arranged along the axial direction of the horizontal fermentation tank. According to the invention, through the combination of the mechanical stirring component and the pneumatic stirring component, the energy consumption of mechanical stirring is reduced, the gas generated by fermentation is used for stirring, the energy is saved, the first pneumatic pipe corresponds to the acid production stage of the material, the second pneumatic pipe corresponds to the methane production stage of the material, the materials in the two stages are differentially stirred, the stirring requirements of the materials in different stages are met, and the efficient anaerobic fermentation of the fermented materials is facilitated.

Description

Mechanical and pneumatic combined dry anaerobic fermentation system and fermentation method
Technical Field
The invention relates to the technical field of dry anaerobic fermentation, in particular to a mechanical and pneumatic combined dry anaerobic fermentation system and a fermentation method.
Background
The dry anaerobic fermentation is an organic biological waste technology with low requirements on raw material pretreatment, low energy consumption, simple system and convenient management, and has good application prospects in aspects of livestock and poultry manure treatment, straw gas production, kitchen waste treatment and the like.
The existing dry anaerobic fermentation usually adopts a horizontal fermentation tank, feeding is carried out from one end, discharging is carried out from the other end, the dry anaerobic fermentation is usually divided into two stages in the horizontal fermentation tank, the front stage is an acid production stage, newly-fed materials enter a reaction tank, more stirring is beneficial to material mixing, a crusting layer (upper layer), a clear liquid layer (middle layer) and a sediment layer (bottom layer) of straw fermentation products are completely mixed, and the materials are fermented to produce acid under the action of proper conditions and microorganisms; the acidogenic material enters the latter half and begins to produce methane, excessive stirring is not beneficial to the methanogenesis of the material, but proper stirring is also needed to help release the produced methane. However, the existing horizontal fermentation tank is internally provided with a single axial mechanical stirring shaft, one of which ensures that the stirring degrees of the front section and the rear section of the fermentation tank are the same, wastes energy, is not beneficial to differential fermentation of the front section and the rear section, and has poor fermentation effect; secondly, there is the stirring blind area at axial mechanical (mixing) shaft, especially is difficult to eliminate tank bottoms deposit and tank deck liquid level stratification, leads to the material to mix inhomogeneous, influences fermentation efficiency, and simultaneously, the liquid level stratification can influence methane and spill, is unfavorable for gas collection, influences fermentation efficiency and marsh gas utilization ratio.
Therefore, in view of the above problems, it is necessary to propose a further solution to solve at least one of the problems.
Disclosure of Invention
The invention aims to provide a dry anaerobic fermentation system and a fermentation method with combined mechanical and pneumatic functions, so as to overcome the defects in the prior art.
In order to solve the technical problems, one technical scheme of the invention is as follows:
a mechanopneumatic combined dry anaerobic fermentation system comprising:
a horizontal fermentation tank comprising an inlet end and an outlet end at both axial ends thereof;
the mechanical stirring assembly is arranged in the horizontal fermentation tank and comprises a stirring shaft arranged along the axial direction of the horizontal fermentation tank and a plurality of blades arranged on the stirring shaft, the free ends of the blades are provided with splitter plates, a plurality of through holes are formed in the splitter plates, and the axes of the through holes are tangential to the circumferential direction of the stirring shaft;
set up in pneumatic stirring subassembly in the horizontal fermentation cylinder, pneumatic stirring subassembly includes along the axial of horizontal fermentation cylinder sets gradually first pneumatic tube, second pneumatic tube and with the air supply line of both being connected, the length ratio of first pneumatic tube and second pneumatic tube is 1: (1.5-2.5), first pneumatic tube and second pneumatic tube all set up in the below of (mixing) shaft, and both sides all alternate interval and are provided with the gas outlet, the axis of gas outlet is less than 90 with the contained angle of horizontal plane.
In a preferred embodiment of the present invention, the horizontal fermentation tank further comprises a backflow assembly, the backflow assembly comprises a backflow pipeline and a pump body connected to the backflow pipeline, one end of the backflow pipeline is connected to the outlet end of the horizontal fermentation tank, and the other end of the backflow pipeline is connected to the inlet end of the horizontal fermentation tank, so as to convey the quantitative material back into the horizontal fermentation tank.
In a preferred embodiment of the invention, the first pneumatic pipe is provided with a first control valve and the second pneumatic pipe is provided with a second control valve, the opening time of the first control valve being 1.5-2 times the opening time of the second control valve.
In a preferred embodiment of the invention, a plurality of domain limiting blocks are arranged along the length direction of the first pneumatic pipe and the second pneumatic pipe, the bottoms of the domain limiting blocks are attached to the bottom of the horizontal fermentation tank, a concave area is formed between every two adjacent domain limiting blocks, the air outlet is positioned in the concave area, and the concave area is gradually enlarged towards two sides along the direction away from the first pneumatic pipe or the second pneumatic pipe.
In a preferred embodiment of the present invention, one end of the air supply pipeline is connected to the horizontal fermentation tank, and the other end of the air supply pipeline is connected to the first pneumatic pipe and the second pneumatic pipe respectively.
In a preferred embodiment of the present invention, the gas supply pipeline is connected with a flame arrester, a check valve and a fan in sequence along the gas flowing direction.
The invention also provides another technical scheme:
a mechanical-pneumatic combined dry anaerobic fermentation method adopts any one of the mechanical-pneumatic combined dry anaerobic fermentation systems and comprises the following steps:
s1, adding inoculation materials according to the inoculation ratio of 25-30%;
s2 the grain size of the broken fermentation material is 3-5 cm;
s3, controlling the solid content of the fermentation material in the horizontal fermentation tank to be 15-20%;
s4, controlling the mechanical stirring component to rotate at 0.5-2.5R/min, stirring for 30min every 12h, and controlling the gas in the pneumatic stirring component to operate at 9.5-10.5m/S and stirring state every 8h for 10min-20 min;
s5, the temperature in the horizontal fermentation tank is maintained to be 33-35 ℃.
In a preferred embodiment of the present invention, in step S3, the liquid separated from the discharged material is transported back to the tank through the inlet end of the material fermentation tank.
In a preferred embodiment of the present invention, the operation time of the first pneumatic tube in the stirring state is 1.5 to 2 times the operation time of the second pneumatic tube in the stirring state.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, through the combination of the mechanical stirring component and the pneumatic stirring component, the energy consumption of mechanical stirring is reduced, the gas generated by fermentation is used for stirring, the energy is saved, the first pneumatic pipe corresponds to the acid production stage of the material, the second pneumatic pipe corresponds to the methane production stage of the material, the materials in the two stages are differentially stirred, the stirring requirements of different stages of anaerobic fermentation are met, and the efficient anaerobic fermentation of the fermented materials is facilitated.
(2) According to the invention, the material is fully stirred by the bubbles generated by the pneumatic stirring component, so that the contact area of fermentation microorganisms, a gas phase and a liquid phase is increased, and meanwhile, the turbulent flow speed of the material is increased, so that the material components and the temperature are uniformly distributed, and the anaerobic fermentation is facilitated; meanwhile, the gas jet can disturb the sediment at the bottom of the tank to destroy the sediment compression process of the sediment, so that the tank bottom is not easy to form siltation, and disturb the floating layer of the liquid level of the material to destroy the layer knot, so that a comprehensive stirring effect is formed, and the anaerobic fermentation efficiency is improved.
(3) The anaerobic fermentation system combines mechanical stirring and pneumatic stirring, and reduces fermentation blind areas, degrades operation energy consumption, saves energy, and improves fermentation efficiency with a simple mechanical stirring anaerobic fermentation system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a perspective enlarged schematic view of a pneumatic tube of the present invention;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the present invention in one embodiment.
Specifically, 100, a horizontal fermentation tank; 110. an inlet end; 120. an outlet end; 130. using acid production as a main area; 140. using methanogenesis as a main zone;
210. a stirring shaft; 220. a blade; 230. a flow distribution plate; 231. a through hole;
310. a first pneumatic tube; 311. an air outlet; 320. an air supply pipeline; 321. a flame arrestor; 322. a check valve; 323. a fan; 324. a gate valve; 325. a biogas flow meter; 326. a biogas storage tank; 330. a domain limiting block; 331. a recessed region; 340. a second pneumatic tube;
410. a return line; 421. a discharge pump; 422. a biogas slurry reflux pump; 430. a dehydrator; 440. a biogas slurry storage tank; 441. a tap water inlet;
510. and heating the temperature control device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in figure 1, the dry anaerobic fermentation system with the combination of mechanical and pneumatic comprises a horizontal fermentation tank 100, a mechanical stirring component and a pneumatic stirring component, reduces energy consumption by matching the mechanical stirring component and the pneumatic stirring component, and meets the stirring requirements of different fermentation stages of materials.
Specifically, the horizontal fermentation tank 100 includes an inlet end 110 and an outlet end 120 at both axial ends thereof, that is, an acidogenic main zone 130 and a methanogenic main zone 140 are sequentially arranged from the inlet end 110 to the outlet end 120.
The horizontal fermentation tank 100 is connected with a heating temperature control device 510 to maintain the fermentation temperature in the tank at 33-35 ℃.
The mechanical stirring subassembly sets up in horizontal fermentation tank 100, and the mechanical stirring subassembly includes along the (mixing) shaft 210 of horizontal fermentation tank 100's axial setting to and set up a plurality of blades 220 on (mixing) shaft 210, thereby make horizontal fermentation tank 100 interior material obtain mechanical stirring, through the high-efficient stirring of machinery, make material intensive mixing even, do benefit to the fermentation and produce acid. The free end of blade 220 is provided with flow distribution plate 230, is provided with a plurality of through-holes 231 on flow distribution plate 230, and the axis of through-hole 231 is tangent with (mixing) shaft 210 circumference to do benefit to flow distribution plate 230 and cut apart the caking material, flow distribution plate 230 and the cooperation of pneumatic stirring subassembly (will explain in detail below) improve the material and mix the degree of consistency simultaneously.
The mechanical agitation provides the same degree of agitation in the acidogenic zone 130 and the methanogenic zone 140, with improved agitation by the pneumatic agitation assembly. The pneumatic stirring assembly comprises a first pneumatic pipe 310, a second pneumatic pipe 340 and a gas supply pipeline 320 connected with the first pneumatic pipe and the second pneumatic pipe which are sequentially arranged along the axial direction of the horizontal fermentation tank 100. The length ratio of the first pneumatic tube 310 to the second pneumatic tube 340 is 1: (1.5-2.5) to be compatible with the fermentation process of the material, i.e. the first pneumatic pipe 310 covers the primary acidogenic zone 130 and the second pneumatic pipe 340 covers the primary methanogenic zone 140. The first pneumatic tube 310 and the second pneumatic tube 340 are both disposed below the stirring assembly. As shown in fig. 2, the first pneumatic tube 310 is alternately provided with air outlets 311 at two sides, and the angle between the axis of the air outlet 311 and the horizontal plane is less than 90 °, so as to facilitate impacting tank bottom sediment. The second pneumatic tube 340 has the same result as the air outlet 311. The gas supply line 320 is preferably connected to a biogas storage tank 326 to store excess gas. First pneumatic pipe is provided with first control valve, second pneumatic pipe 340 is provided with the second control valve, the opening time of first control valve is 1.5-2 times of second control valve opening time, thereby make to use the acidogenesis to obtain more abundant stirring for the material of giving first zone 130, thereby improve fermentation efficiency, and use the material of giving first zone 140 of methane production to obtain less stirring, thereby avoid disturbing the material and produce methane, suitably through the air current pressure boost to this region simultaneously, make the air current can assemble the methane that drives the production, break through the liquid level and become the layer, fully release gas, avoid gas gathering inside the material.
As shown in fig. 3 and 4, it is preferable that a plurality of domain blocks 330 are provided along the length direction of the first pneumatic tube 310 and the second pneumatic tube 340. The bottom of the confinement block 330 is attached to the bottom of the horizontal fermenter 100 to prevent material from depositing between the pneumatic tube 310 and the bottom of the tank. A concave area 331 is formed between two adjacent confinement blocks 330, so as to facilitate the accumulation of the sediment, and further, the top of the confinement block 330 is gradually inclined downwards from one side close to the first pneumatic pipe 310 or the second pneumatic pipe 340 to the opposite side, so that the sediment is closer to the tank wall, the mechanical stirring is facilitated, and the pneumatic stirring pressure is reduced. The air outlet 311 is located in the recessed area 331, and the air flow range is limited by the recessed area 331, so that the air flow can be more concentrated on the sediment. The recessed area 331 gradually expands toward both sides in a direction away from the first pneumatic tube 310 or the second pneumatic tube 340, thereby expanding the deposition range, reducing the material deposited above the confinement block 330, and facilitating the airflow to gradually push the deposit.
As shown in fig. 2, the airflow pushes the sediment to move along the direction indicated by the arrow, so as to lift the sediment, and then the lifted object is quickly taken away by the plate surface of the splitter plate 230 to be high and mixed with other materials, so as to avoid re-falling of the lifted object in a short time, and meanwhile, the sediment is agglomerated due to gravity, so that the through holes 231 on the splitter plate 230 can be quickly separated to agglomerate, so as to refine the sediment, thereby facilitating mixing; after a period of time, the sediment is greatly reduced, the bubbles generated by the airflow are divided into more small bubbles by the through holes 231 through the flow distribution plate 230, the small bubbles enter the material, the contact area of fermentation microorganisms, a gas phase and a liquid phase is increased, meanwhile, the bubbles rise to increase the turbulent flow speed of the material, so that the material components and the temperature are uniformly distributed, and the anaerobic fermentation is facilitated.
As shown in FIG. 1, in the system, one end of an air supply pipeline 320 is connected with the horizontal fermentation tank 100, and the other end is respectively connected with a first pneumatic pipe 310 and a second pneumatic pipe 340, so that the gas generated by fermentation is used for pneumatic stirring, and the cost is saved. The gas supply pipe 320 is preferably connected to a flame arrester 321, a check valve 322, and a blower 323 in this order in the gas flow direction. The fire arrestor 321 is to prevent the flame of flammable gas methane in the pipeline from spreading to the horizontal fermentation tank 100. The check valve 322 prevents the biogas of the pneumatic stirring medium from flowing back to the horizontal fermentation tank 100. The fan 323 inputs mechanical energy into the biogas generated in the horizontal fermentation tank 100 to increase the pressure and kinetic energy of the biogas, and provides energy and medium for pneumatic stirring. The gas pipe 320 may further include a biogas flow meter 325 for measuring the amount of biogas used in the pneumatic stirring process to adjust the parameter conditions of the pneumatic stirring. The connection between the gas supply line 320 and the horizontal fermentation tank 100 is provided with a gate valve 324.
As shown in fig. 1, the system preferably further comprises a backflow assembly, the backflow assembly comprises a backflow pipeline 410 and a pump body connected to the backflow pipeline 410, one end of the backflow pipeline 410 is connected to the outlet end 120 of the horizontal fermentation tank 100, and the other end of the backflow pipeline 410 is connected to the inlet end 110 of the horizontal fermentation tank 100, so as to convey quantitative material back into the horizontal fermentation tank 100, mainly the biogas slurry, and reduce biogas slurry waste. Specifically, the backflow component includes two backflow pipelines 410, one backflow pipeline 410 is connected with the discharge pump 421, and directly conveys the liquid dropping from the discharged material back to the tank, and because the liquid in the pipeline is less, the pipeline does not need to be provided with the gate valve 324; another return line 410 is connected with hydroextractor 430, and the liquid in the material discharging thing after hydroextractor 430 is handled is carried back to the jar in, because liquid is more in this pipeline, can set up natural pond liquid storage jar 440, natural pond liquid reflux pump 422 on the pipeline, and natural pond liquid storage jar 440 can be provided with running water access mouth 441 simultaneously to the not enough of supplementary backward flow liquid, with to carrying suitable liquid in the jar, keep jar interior fermentation material humidity suitable.
A mechanical-pneumatic combined dry anaerobic fermentation method adopts any one of the mechanical-pneumatic combined dry anaerobic fermentation systems and comprises the following steps:
s1 adding the inoculation material according to the inoculation ratio of 25-30%.
S2 the grain size of the broken fermentation material is 3-5cm, and the fermentation material is crop straw and the like.
S3, controlling the solid content of the fermentation material in the horizontal fermentation tank 100 to be 15-20%. Generally, the material is fed at 25kg/d, and the separated liquid in the discharged material is conveyed back to the tank from the inlet end 110 at 125-.
S4, controlling the mechanical stirring component to rotate at 0.5-2.5R/min, stirring for 30min every 12h,controlling the gas in the pneumatic stirring component to operate at 9.5-10.5m/s for 10-20 min in a stirring state every 8 h. Preferably, the stirring state operation time of the first pneumatic tube 310 is 1.5 to 2 times the stirring state operation time of the second pneumatic tube 340. Generally, the blower 323 pressure is 0.12-0.3kgf/m2。
S5 the temperature in the horizontal fermentation tank 100 is maintained at 33-35 deg.C, and the heating temperature control device 510 can be used.
In conclusion, the mechanical stirring energy consumption is reduced through the combination of the mechanical stirring component and the pneumatic stirring component, the gas generated by fermentation is used for stirring, the energy is saved, the first pneumatic pipe corresponds to the acid production stage of the material, the second pneumatic pipe corresponds to the methane production stage of the material, the materials in the two stages are differentially stirred, the stirring requirements of the materials in different stages are met, and the anaerobic fermentation of the fermented materials is facilitated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. A combined mechanical and pneumatic dry anaerobic fermentation system is characterized by comprising:
a horizontal fermentation tank comprising an inlet end and an outlet end at both axial ends thereof;
the mechanical stirring assembly is arranged in the horizontal fermentation tank and comprises a stirring shaft arranged along the axial direction of the horizontal fermentation tank and a plurality of blades arranged on the stirring shaft, the free ends of the blades are provided with splitter plates, a plurality of through holes are formed in the splitter plates, and the axes of the through holes are tangential to the circumferential direction of the stirring shaft;
set up in pneumatic stirring subassembly in the horizontal fermentation cylinder, pneumatic stirring subassembly includes along the axial of horizontal fermentation cylinder sets gradually first pneumatic tube, second pneumatic tube and with the air supply line of both being connected, the length ratio of first pneumatic tube and second pneumatic tube is 1: (1.5-2.5), first pneumatic tube and second pneumatic tube all set up in the below of (mixing) shaft, and both sides all alternate interval and are provided with the gas outlet, the axis of gas outlet is less than 90 with the contained angle of horizontal plane.
2. The mechanopneumatic dry anaerobic fermentation system according to claim 1, further comprising a return assembly including a return line and a pump body connected to the return line, wherein one end of the return line is connected to the outlet end of the horizontal fermentation tank and the other end is connected to the inlet end of the horizontal fermentation tank to deliver a quantitative material back into the horizontal fermentation tank.
3. The mechanopneumatic combined dry anaerobic fermentation system according to claim 1, wherein the first pneumatic pipe is provided with a first control valve, the second pneumatic pipe is provided with a second control valve, and the opening time of the first control valve is 1.5-2 times the opening time of the second control valve.
4. The mechanical-pneumatic combined dry anaerobic fermentation system according to claim 1, wherein a plurality of domain limiting blocks are arranged along the length direction of the first pneumatic pipe and the second pneumatic pipe, the bottoms of the domain limiting blocks are attached to the bottom of the horizontal fermentation tank, a concave area is formed between two adjacent domain limiting blocks, the air outlet is positioned in the concave area, and the concave area gradually expands towards two sides along the direction away from the first pneumatic pipe or the second pneumatic pipe.
5. The mechanopneumatic dry anaerobic fermentation system according to claim 1, wherein one end of the air supply pipeline is connected to the horizontal fermentation tank, and the other end is connected to the first pneumatic pipe and the second pneumatic pipe, respectively.
6. The mechanopneumatic dry anaerobic fermentation system according to claim 5, wherein a flame arrester, a check valve and a fan are connected to the gas supply pipeline in this order in the gas flow direction.
7. A mechano-pneumatic combined dry anaerobic fermentation method, characterized in that the mechano-pneumatic combined dry anaerobic fermentation system of any one of claims 1 to 6 is adopted, and comprises the following steps:
s1, adding the inoculation materials according to the inoculation ratio of 25-30%;
s2 the grain size of the broken fermentation material is 3-5 cm;
s3, controlling the solid content of the fermentation material in the horizontal fermentation tank to be 15-20%;
s4, controlling the mechanical stirring component to rotate at 0.5-2.5R/min, stirring for 30min every 12h, and controlling the gas in the pneumatic stirring component to operate at 9.5-10.5m/S and stirring state every 8h for 10min-20 min;
s5, the temperature in the horizontal fermentation tank is maintained to be 33-35 ℃.
8. The mechano-pneumatic hybrid dry anaerobic fermentation method of claim 7, wherein the liquid separated from the discharged material in step S3 is transported back to the tank through the inlet end of the material fermentation tank.
9. The mechano-pneumatic combined dry anaerobic fermentation method according to claim 7, wherein the stirring state running time of the first pneumatic pipe is 1.5-2 times the stirring state running time of the second pneumatic pipe.
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