CN113373027B - External rotation continuous anaerobic dry fermentation equipment and fermentation method - Google Patents
External rotation continuous anaerobic dry fermentation equipment and fermentation method Download PDFInfo
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- CN113373027B CN113373027B CN202110766283.0A CN202110766283A CN113373027B CN 113373027 B CN113373027 B CN 113373027B CN 202110766283 A CN202110766283 A CN 202110766283A CN 113373027 B CN113373027 B CN 113373027B
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- 238000000855 fermentation Methods 0.000 title claims abstract description 195
- 230000004151 fermentation Effects 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 66
- 238000007599 discharging Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 239000002893 slag Substances 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 238000003860 storage Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims description 34
- 239000002002 slurry Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 26
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 44
- 230000033001 locomotion Effects 0.000 description 6
- 239000013049 sediment Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
- C12M27/02—Stirrer or mobile mixing elements
- C12M27/06—Stirrer or mobile mixing elements with horizontal or inclined stirrer shaft or axis
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- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
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- C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
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- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses external rotation continuous anaerobic dry fermentation equipment and a method, which relate to the technical field of waste anaerobic fermentation, wherein a central shaft is fixedly connected in a closed shell, a rotary fermentation tank is arranged in the closed shell and is rotationally connected to the central shaft, one end of a feeding pipeline is fixedly connected with a discharging port of a pre-storage device in a sealing way, the other end of the feeding pipeline is fixedly connected with the closed shell in a sealing way, and is rotationally and hermetically connected with one end of the rotary fermentation tank after passing through the closed shell, the other end of the rotary fermentation tank is rotationally and hermetically connected to the central shaft, a stirrer is fixedly connected to the central shaft, a rotary driving device can drive the rotary fermentation tank to rotate, a plurality of discharging ports are arranged on the peripheral surface of the rotary fermentation tank, each discharging port is communicated with a discharging device, and an air outlet and a slag liquid outlet which are respectively communicated with an air collecting port and a slag liquid collecting port on the closed shell are arranged on the discharging device. Can reduce the blocking phenomenon in the continuous anaerobic dry fermentation process, stir more uniformly, and improve the fermentation effect.
Description
Technical Field
The invention relates to the technical field of anaerobic fermentation of wastes, in particular to an external rotation continuous anaerobic dry fermentation device and a fermentation method.
Background
The continuous anaerobic dry fermentation technology is characterized in that after the reactor is started, new materials are continuously and quantitatively added into the fermentation tank every day and biogas residues and biogas slurry are discharged, so that the continuous operation of the reactor is realized, and the continuous anaerobic dry fermentation technology has the advantages of continuous and stable gas production, high volume gas production rate, high dry matter degradation rate, large treatment capacity and the like. However, the equipment applied to the continuous anaerobic dry fermentation technology at present has the problems of uneven stirring and easy blockage, and the effects of continuous gas production, high volume gas production rate and large treatment capacity cannot be realized. Therefore, how to develop an efficient, rapid and uniformly mixed external rotary continuous anaerobic dry fermentation device so as to effectively promote the application of continuous anaerobic dry fermentation technology is a technical problem which needs to be solved in the research field.
Disclosure of Invention
The invention aims to provide an external rotation continuous anaerobic dry fermentation device and a fermentation method, which are used for solving the problems in the prior art, reducing the blocking phenomenon in the continuous anaerobic dry fermentation process, enhancing the stirring effect in the continuous anaerobic dry fermentation process, ensuring more uniform stirring and improving the fermentation effect.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides external rotation continuous anaerobic dry fermentation equipment which comprises a pre-storage device, a feeding pipeline, a closed shell, a rotary fermentation tank, a stirrer, a rotary driving device and a discharging device, wherein a central shaft is fixedly connected in the closed shell, the rotary fermentation tank is arranged in the closed shell and is rotationally connected to the central shaft, one end of the feeding pipeline is fixedly connected with a discharging port of the pre-storage device in a sealing manner, the other end of the feeding pipeline is fixedly connected with the closed shell in a sealing manner, the other end of the feeding pipeline is in relatively rotary sealing connection with one end of the rotary fermentation tank after passing through the closed shell, the other end of the rotary fermentation tank is rotationally and hermetically connected to the central shaft, the stirrer is fixedly connected to the central shaft and is positioned in the rotary fermentation tank, the rotary driving device can drive the rotary fermentation tank to rotate around the central shaft, a plurality of discharging ports are arranged on the outer peripheral surface of one end of the rotary fermentation tank, which is far away from the feeding pipeline, each discharging port is communicated with the discharging device, an air outlet and a slag liquid outlet are arranged on the discharging device, the air outlet and a slag liquid outlet are respectively communicated with a slag liquid collecting port on the closed slag outlet and a slag liquid outlet.
Preferably, the pre-storage device comprises at least one conical hopper, each conical hopper is internally and rotatably connected with a spiral stirring device, each spiral stirring device comprises a rotating shaft, a spiral stirring blade and a spiral driving motor, the rotating shaft is rotatably connected in the conical hopper and coaxial with the conical hopper, the spiral stirring blade is fixedly connected to the outer side wall of the rotating shaft and coaxial with the rotating shaft, and the radius of the spiral stirring blade is gradually reduced from one end corresponding to the large-mouth end of the conical hopper to one end corresponding to the small-mouth end of the conical hopper.
Preferably, the stirrer is provided with a plurality of stirring units, the plurality of stirring units are fixed on the central shaft at intervals, each stirring unit comprises two stirring units, each stirring unit is axially distributed along the central shaft at intervals, each stirring unit comprises a plurality of stirring rods, each stirring rod in one stirring unit is fixedly connected on the central shaft and uniformly distributed along the circumferential direction of the central shaft, and a fan-shaped scraping plate is fixedly arranged at the top end of each stirring rod.
Preferably, a plurality of sieve plates are fixedly connected between two stirring units in one stirrer, a plurality of sieve holes with different apertures are formed in each sieve plate, and each sieve hole is randomly distributed on each sieve plate.
Preferably, the sealed shell comprises a first shell and a second shell which are in sealing and fixed connection with each other, the inner diameter of the first shell is smaller than the inner diameter of the second shell, the rotary fermentation tank comprises a first tank body and a second tank body which are in sealing and fixed connection with each other, the inner diameter of the first tank body is smaller than the inner diameter of the second tank body, the first tank body is correspondingly arranged with the first shell, the second tank body is correspondingly arranged with the second shell, and the feeding pipeline is in sealing and fixed connection with the first shell and is in relative rotation and sealing connection with the first tank body after passing through the first shell; the central shaft comprises a first shaft section and a second shaft section which are coaxially and fixedly connected, the first shaft section is positioned in the first tank body, the second shaft section is positioned in the second tank body, a spiral conveying blade is fixedly arranged on the outer peripheral surface of the first shaft section, materials can be conveyed from the first tank body to the second tank body by the spiral conveying blade under the rotating action of the rotary fermentation tank, a sleeve is fixedly sleeved on the outer peripheral surface of the second shaft section, and the stirrer is fixedly arranged on the outer peripheral surface of the sleeve.
Preferably, the rotary driving device comprises a rotary driving motor, a power input shaft, a roller rotating shaft and rotary rollers, wherein the rotary driving motor is in transmission connection with the power input shaft, the power input shaft is in transmission connection with the roller rotating shaft through a chain, a plurality of circular roller tracks are arranged on the outer peripheral surface of the second tank body at intervals, and the roller rotating shaft is fixedly connected with a plurality of rotary rollers corresponding to the roller tracks.
Preferably, the discharging device comprises a discharging ring, an annular groove is formed in the inner wall of the discharging ring, the discharging ring is fixedly connected in the closed shell, the discharging ring and the outer peripheral surface of the rotary fermentation tank are relatively rotated and are in sealing connection, each discharging hole is communicated with the annular groove, and the air outlet and the slag liquid outlet are respectively arranged at the upper end and the lower end of the annular groove.
Preferably, a spiral heating pipe is fixedly arranged on the inner wall of the second shell, and the axis of the spiral heating pipe is collinear with the axis of the second shell.
Preferably, the discharging ring is in sealing connection with the peripheral surface of the rotary fermentation tank, the rotary fermentation tank and the feeding pipeline by adopting a floating ring, and the air outlet is connected with the air collecting port, the slag liquid outlet and the slag liquid collecting port by hoses.
The invention also provides a fermentation method based on the external rotation continuous anaerobic dry fermentation equipment, which comprises the following steps of:
s1: placing fermentation raw materials into the pre-storage device, enabling the fermentation raw materials to enter the rotary fermentation tank along the feeding pipeline, and performing anaerobic reaction in the rotary fermentation tank;
s2: the rotary driving device drives the rotary fermentation tank to rotate around the central shaft, and the rotating rotary fermentation tank and the stirrer stir fermentation raw materials together;
s3: and the biogas, the biogas residue and the biogas slurry generated in the fermentation process are discharged from the discharge port to the discharge device, then the biogas is discharged from the gas collecting port through the gas outlet, and the biogas residue and the biogas slurry are discharged from the residue liquid collecting port through the residue liquid outlet.
Compared with the prior art, the invention has the following technical effects:
the invention provides an external rotation continuous anaerobic dry fermentation device and a fermentation method, when the device works, fermentation raw materials are placed in a pre-storage device, the fermentation raw materials enter a rotary fermentation tank along a feeding pipeline to perform anaerobic reaction, a closed shell provides an airtight environment for the fermentation process and has a heat preservation effect, the rotary driving device drives the rotary fermentation tank to rotate around a central shaft, the fermentation raw materials gradually rise to the top end along with the rotation of the rotary fermentation tank due to the rotation effect of the rotary fermentation tank, then freely fall to the bottom end of the rotary fermentation tank under the action of gravity to form circulation, the flow and mixing of the fermentation raw materials are promoted, the stirring effect of a stirrer on the fermentation raw materials is enhanced, meanwhile, the stirring effect of the stirrer on the fermentation raw materials is more uniform, so that the fermentation effect is improved, and biogas, biogas slurry and biogas residues generated by fermentation can be discharged into the discharge device through the discharge ports while the rotary fermentation tank rotates, the biogas slurry and the biogas residues are always in a motion state, and the movement of the biogas residues and the biogas residues are discharged through the discharge ports under the action, so that the phenomenon of blocking of the anaerobic residues in the continuous fermentation process can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an external rotary continuous anaerobic dry fermentation device provided by the invention;
FIG. 2 is a partial cross-sectional view of the external rotary continuous anaerobic dry fermentation apparatus of FIG. 1;
FIG. 3 is a cross-sectional view A-A of the external rotary continuous anaerobic dry fermentation apparatus of FIG. 1;
FIG. 4 is a schematic diagram showing the internal structure of a pre-storage device in an external rotary continuous anaerobic dry fermentation apparatus according to the present invention;
FIG. 5 is an enlarged partial view of section I of the external rotary continuous anaerobic dry fermentation apparatus of FIG. 2;
FIG. 6 is an enlarged partial view of section II of the external rotary continuous anaerobic dry fermentation apparatus of FIG. 2;
FIG. 7 is a schematic structural view of a stirring unit in an external rotation continuous anaerobic dry fermentation device provided by the invention;
FIG. 8 is a schematic view of the structure of the stirrer in the external rotary continuous anaerobic dry fermentation device provided by the invention;
FIG. 9 is a cross-sectional view of a rotary fermenter in an external rotary continuous anaerobic dry fermentation apparatus provided by the present invention;
FIG. 10 is an enlarged view of a portion III of the rotary fermenter of FIG. 9;
FIG. 11 is a cross-sectional view of a containment vessel in an external rotary continuous anaerobic dry fermentation device provided by the present invention;
in the figure: 100-external rotation continuous anaerobic dry fermentation equipment, 1-pre-storage device, 2-feeding pipeline, 3-closed shell, 4-rotation fermentation tank, 5-stirrer, 6-rotation driving device, 7-discharging device, 8-central shaft, 9-discharging port, 10-gas outlet, 11-slag liquid outlet, 12-gas collecting port, 13-slag liquid collecting port, 14-conical hopper, 15-spiral stirring device, 16-rotating shaft, 17-spiral stirring blade, 18-spiral heating pipe, 19-stirring unit, 20-stirring rod, 21-fan-shaped scraping plate, 22-sieve plate, 23-first shell, 24-second shell, 25-first tank, 26-second tank, 27-first shaft section, 28-second shaft section, 29-spiral conveying blade, 30-sleeve, 31-roller rotating shaft, 32-rotating roller, 33-roller track, 34-discharging ring and 35-annular groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide external rotation continuous anaerobic dry fermentation equipment and a fermentation method, so as to solve the problems in the prior art, reduce the blocking phenomenon in the continuous anaerobic dry fermentation process, enhance the stirring effect in the continuous anaerobic dry fermentation process, stir more uniformly and improve the fermentation effect.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 6, this embodiment provides an external rotation continuous anaerobic dry fermentation device 100, which comprises a pre-storage device 1, a feeding pipeline 2, a closed shell 3, a rotary fermentation tank 4, a stirrer 5, a rotary driving device 6 and a discharging device 7, wherein the central shaft 8 is fixedly connected in the closed shell 3, the rotary fermentation tank 4 is arranged in the closed shell 3 and is rotationally connected on the central shaft 8, one end of the feeding pipeline 2 is in sealing and fixed connection with a feed opening of the pre-storage device 1, the other end of the feeding pipeline 2 is in sealing and fixed connection with the closed shell 3 and is rotationally and fixedly connected with one end of the rotary fermentation tank 4 after passing through the closed shell 3, the other end of the rotary fermentation tank 4 is rotationally and hermetically connected on the central shaft 8, the stirrer 5 is fixedly connected on the central shaft 8 and is positioned in the rotary fermentation tank 4, the rotary driving device 6 can drive the rotary fermentation tank 4 to rotate around the central shaft 8, a plurality of discharge openings 9 are arranged on the outer peripheral surface of one end of the rotary fermentation tank 4 far away from the feeding pipeline 2, each discharge opening 9 is communicated with the discharging device 7, an air outlet 10 and a slag liquid outlet 11 are arranged on the discharging device 7, the air outlet 10 and a slag liquid outlet 11 are respectively communicated with a collection opening 13 on the closed slag liquid outlet 11 and a slag liquid outlet 12 and a collection opening 13 on the closed shell 3.
During operation, fermentation raw materials are placed in the pre-storage device 1, the fermentation raw materials continuously enter the rotary fermentation tank 4 along the feeding pipeline 2 to perform anaerobic reaction, the airtight shell 3 provides an airtight environment for the fermentation process and has a heat preservation effect, the rotary driving device 6 drives the rotary fermentation tank 4 to rotate around the central shaft 8, due to the rotation effect of the rotary fermentation tank 4, the fermentation raw materials gradually rise to the top end along with the rotation of the rotary fermentation tank 4 and then freely fall to the bottom end of the rotary fermentation tank 4 under the action of gravity to form circulation, the flow and mixing of the fermentation raw materials are promoted, the stirring effect in the continuous anaerobic dry fermentation process is enhanced, meanwhile, the stirring effect of the stirrer 5 on the fermentation raw materials is achieved, the stirring effect of the fermentation raw materials is achieved through the joint action of the stirrer 5 on the rotating rotary fermentation tank 4, so that the stirring effect of the fermentation materials is more uniform, and the fermentation effect is improved; because the outer peripheral surface of one end of the rotary fermentation tank 4 far away from the feeding pipeline 2 is provided with the plurality of discharge holes 9, when the rotary fermentation tank 4 rotates, methane, biogas slurry and biogas residues generated by fermentation can be discharged into the discharge device 7 through the discharge holes 9, the methane, the biogas slurry and the biogas residues are always in a motion state, and the biogas slurry and the biogas residues are discharged through the discharge holes 9 in motion and under the action of centrifugal force, so that the deposition of the biogas slurry and the biogas residues can be reduced, and the blocking phenomenon in the continuous anaerobic dry fermentation process is reduced.
As shown in fig. 1 to 4, in this embodiment, the pre-storage device 1 includes at least one tapered hopper 14, a spiral stirring device 15 is rotatably connected in each tapered hopper 14, the spiral stirring device 15 includes a rotating shaft 16, a spiral stirring blade 17 and a spiral driving motor, the rotating shaft 16 is rotatably connected in the tapered hopper 14 and is coaxial with the tapered hopper 14, the spiral stirring blade 17 is fixedly connected to the outer side wall of the rotating shaft 16, the spiral stirring blade 17 is coaxial with the rotating shaft 16, and the radius of the spiral stirring blade 17 is gradually reduced from one end corresponding to the large opening end of the tapered hopper 14 to one end corresponding to the small opening end of the tapered hopper 14. The fermentation raw materials keep flowing state under the stirring action of the spiral stirring device 15, can prevent the fermentation raw materials from solidifying, and promote the fermentation raw materials to be uniformly mixed, so that the situation that the fermentation raw materials block the feeding pipeline 2 or the discharge hole 9 due to solidification is reduced.
As shown in fig. 2 to 3 and fig. 7 to 8, in the present embodiment, a plurality of agitators 5 are provided, the plurality of agitators 5 are fixed on the central shaft 8 at intervals, each agitator 5 includes two agitating units 19, each agitating unit 19 is distributed along the axial direction of the central shaft 8 at intervals, each agitating unit 19 includes a plurality of agitating rods 20, each agitating rod 20 in one agitating unit 19 is fixedly connected on the central shaft 8 and uniformly distributed along the circumferential direction of the central shaft 8, and a fan-shaped scraping plate 21 is fixedly provided at the top end of each agitating rod 20. Specifically, in the present embodiment, three agitators 5 are provided, and a good disturbance effect can be achieved on the fermentation raw materials through each agitating rod 20 and the fan-shaped scraping plate 21, so that the fermentation raw materials are more uniformly mixed, and the fermentation effect is improved.
As shown in fig. 8, in this embodiment, a plurality of sieve plates 22 are fixedly connected between two stirring units 19 in one stirrer 5, and each sieve plate 22 is provided with a plurality of sieve holes with different apertures, and each sieve hole is randomly distributed on the sieve plate 22. The moving fermentation raw material falls on the sieve plate 22, and particles in the fermentation raw material are separated through the sieve plate 22, so that the uniformity of the fermentation raw material is further improved.
As shown in fig. 1 to 2, in this embodiment, the airtight housing 3 includes a first housing 23 and a second housing 24 that are fixedly connected to each other in a sealing manner, an inner diameter of the first housing 23 is smaller than an inner diameter of the second housing 24, the rotary fermenter 4 includes a first tank 25 and a second tank 26 that are fixedly connected to each other in a sealing manner, an inner diameter of the first tank 25 is smaller than an inner diameter of the second tank 26, the first tank 25 is disposed corresponding to the first housing 23, the second tank 26 is disposed corresponding to the second housing 24, and the feed pipe 2 is fixedly connected to the first housing 23 in a sealing manner and rotatably connected to the first tank 25 after passing through the first housing 23; the center shaft 8 comprises a first shaft section 27 and a second shaft section 28 which are coaxially and fixedly connected, the first shaft section 27 is positioned in a first tank body 25, the second shaft section 28 is positioned in a second tank body 26, a spiral conveying blade 29 is fixedly arranged on the outer peripheral surface of the first shaft section 27, under the rotating action of the rotary fermentation tank 4, materials can be conveyed from the first tank body 25 to the second tank body 26 by the spiral conveying blade 29, a sleeve 30 is fixedly sleeved outside the second shaft section 28, and a stirrer 5 is fixedly arranged on the outer peripheral surface of the sleeve 30. The fermentation raw materials continuously enter the first tank body 25 along the feeding pipeline 2, under the rotation action of the spiral conveying blades 29 and the rotary fermentation tank 4, the fermentation raw materials can enter the second tank body 26, the methane slag and the methane liquid formed by fermentation continuously move towards the rear end of the rotary fermentation tank 4 under the pushing action of the new fermentation raw materials until the methane, the methane slag and the methane liquid move to the discharge holes 9 on the circumferential surface of the rotary fermentation tank 4, the methane slag and the methane liquid are discharged into the discharge device 7 from the discharge holes 9, the methane flows to the gas collecting holes 12 on the closed shell 3 through the gas outlet 10 in the discharge device 7, the methane is collected, the methane slag and the methane liquid flow to the slag and liquid collecting holes 13 on the closed shell 3 through the slag and liquid outlet 11 in the discharge device 7, and the methane slag and the methane liquid are collected.
As shown in fig. 2 and 10, in the present embodiment, the rotary driving device 6 includes a rotary driving motor, a power input shaft, a roller rotating shaft 31 and rotary rollers 32, the rotary driving motor is in transmission connection with the power input shaft, the power input shaft is in transmission connection with the roller rotating shaft 31 through a chain, a plurality of circular roller tracks 33 are arranged on the outer peripheral surface of the second tank 26 at intervals, and a plurality of rotary rollers 32 corresponding to the roller tracks 33 are fixedly connected to the roller rotating shaft 31. Specifically, in this embodiment, three roller tracks 33 are provided, three rotary rollers 32 corresponding to each roller track 33 are provided on the roller rotating shaft 31, and the power input shaft is driven to rotate by the rotary driving motor, the power input shaft drives the roller rotating shaft 31 to rotate, and the roller rotating shaft 31 drives each rotary roller 32 to rotate, so as to drive the second tank 26 to rotate around the central shaft 8, and stir the fermentation raw material. Wherein, rotary driving motor, power input shaft, gyro wheel pivot 31 and rotatory gyro wheel 32 all set up in airtight casing 3 inside to guarantee the leakproofness of fermentation environment.
As shown in fig. 5 to 6, in this embodiment, the discharging device 7 includes a discharging ring 34, an annular groove 35 is provided on the inner wall of the discharging ring 34, the discharging ring 34 is fixedly connected in the sealed housing 3, the discharging ring 34 rotates relatively to the outer peripheral surface of the rotary fermenter 4 and is in sealing connection with the outer peripheral surface, each discharging port 9 is communicated with the annular groove 35, and the air outlet 10 and the slag liquid outlet 11 are respectively provided at the upper end and the lower end of the annular groove 35. Wherein, be equipped with annular guiding gutter on rotatory fermentation cylinder 4 outer peripheral face, each discharge gate 9 along rotatory fermentation cylinder 4 circumference evenly distributed, and all communicate with annular guiding gutter, annular guiding gutter and annular groove 35 intercommunication, marsh gas sediment and natural pond liquid get into annular space that annular guiding gutter and annular groove 35 constitute from each discharge gate 9, flow along annular space, marsh gas flows through the pipe from the gas outlet 10 of annular groove 35 upper end and flows to gas collection mouth 12, and then collect marsh gas, marsh gas sediment and natural pond liquid flow through the pipe from the sediment liquid export 11 of annular groove 35 lower extreme and flow to sediment liquid collection mouth 13, and then collect marsh gas sediment and natural pond liquid.
As shown in fig. 11, in the present embodiment, a spiral heating pipe 36 is fixedly provided on the inner wall of the second housing 24, and the axis of the spiral heating pipe 36 is collinear with the axis of the second housing 24. By introducing hot water into the spiral heating pipe 36, the interior of the closed shell 3 can be heated, and a proper and stable environment temperature is provided for the fermentation process, so that the fermentation is facilitated.
The discharging ring 34 is in sealing connection with the outer peripheral surface of the rotary fermentation tank 4, the rotary fermentation tank 4 and the feeding pipeline 2 through floating rings, and the air outlet 10 is connected with the air collecting port 12, the slag liquid outlet 11 and the slag liquid collecting port 13 through hoses. The floating ring seal is a dynamic seal device which prevents medium from leaking outside by utilizing a high-pressure oil film between the floating ring and the rotating piece, is also called as oil film seal, and realizes seal when the rotary fermentation tank 4 rotates by adopting the floating ring seal, and has good seal effect.
A fermentation method based on the external rotation continuous anaerobic dry fermentation apparatus 100 described above, comprising the steps of:
s1: placing fermentation raw materials into a pre-storage device 1, enabling the fermentation raw materials to enter a rotary fermentation tank 4 along a feeding pipeline 2, and performing anaerobic reaction in the rotary fermentation tank 4;
s2: the rotary driving device 6 drives the rotary fermentation tank 4 to rotate around the central shaft 8, and the rotary fermentation tank 4 and the stirrer 5 stir fermentation raw materials together;
s3: biogas, biogas residue and biogas slurry generated in the fermentation process are discharged from the discharge port 9 to the discharge device 7, and then the biogas is discharged from the gas collecting port 12 through the gas outlet 10, and the biogas residue and the biogas slurry are discharged from the residue and liquid collecting port 13 through the residue and liquid outlet 11.
Due to the rotation effect of the rotary fermentation tank 4, fermentation materials gradually rise to the top end from the bottom end along with the rotation of the rotary fermentation tank 4, then freely fall to the bottom end of the rotary fermentation tank 4 under the action of gravity to form circulation, promote the flow and mixing of the fermentation materials, enhance the stirring effect in the continuous anaerobic dry fermentation process, and simultaneously, under the stirring effect of the stirrer 5 on the fermentation materials, act together with the rotary fermentation tank 4, so that the stirring of the fermentation materials is more uniform, and the fermentation effect is improved; because the outer peripheral surface of one end of the rotary fermentation tank 4 far away from the feeding pipeline 2 is provided with the plurality of discharge holes 9, when the rotary fermentation tank 4 rotates, methane, biogas slurry and biogas residues generated by fermentation can be discharged into the discharge device 7 through the discharge holes 9, the methane, the biogas slurry and the biogas residues are always in a motion state, and the biogas slurry and the biogas residues are discharged through the discharge holes 9 in motion and under the action of centrifugal force, so that the deposition of the biogas slurry and the biogas residues can be reduced, and the blocking phenomenon in the continuous anaerobic dry fermentation process is reduced.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. An external rotation continuous anaerobic dry fermentation device is characterized in that: the device comprises a pre-storage device, a feeding pipeline, a closed shell, a rotary fermentation tank, a stirrer, a rotary driving device and a discharging device, wherein a central shaft is fixedly connected in the closed shell, the rotary fermentation tank is arranged in the closed shell and is rotationally connected to the central shaft, one end of the feeding pipeline is fixedly connected with a discharging port of the pre-storage device in a sealing manner, the other end of the feeding pipeline is fixedly connected with the closed shell in a sealing manner, the feeding pipeline passes through the closed shell and is rotationally and oppositely connected with one end of the rotary fermentation tank in a sealing manner, the other end of the rotary fermentation tank is rotationally and hermetically connected to the central shaft, the stirrer is fixedly connected to the central shaft and is positioned in the rotary fermentation tank, the rotary driving device can drive the rotary fermentation tank to rotate around the central shaft, a plurality of discharging ports are formed in the outer peripheral surface of one end of the rotary fermentation tank, which is far away from the feeding pipeline, each discharging port is communicated with the discharging device, an air outlet and a slag liquid outlet are formed in the discharging device, the air outlet is communicated with a gas collecting port in the closed shell, and the slag liquid outlet is communicated with a collecting port in the closed shell;
the rotary fermentation tank comprises a first tank body and a second tank body which are mutually and fixedly connected in a sealing manner, the rotary driving device comprises a rotary driving motor, a power input shaft, a roller rotating shaft and rotary rollers, the rotary driving motor is in transmission connection with the power input shaft, the power input shaft is in transmission connection with the roller rotating shaft through a chain, a plurality of circular roller tracks are arranged on the peripheral surface of the second tank body at intervals, and a plurality of rotary rollers corresponding to the roller tracks are fixedly connected to the roller rotating shaft;
the discharging device comprises a discharging ring, an annular groove is formed in the inner wall of the discharging ring, the discharging ring is fixedly connected in the closed shell, the discharging ring and the outer peripheral surface of the rotary fermentation tank are in relative rotation and are in sealing connection, each discharging hole is communicated with the annular groove, the air outlet is formed in the upper end of the annular groove, and the slag liquid outlet is formed in the lower end of the annular groove;
the peripheral surface of the rotary fermentation tank is provided with annular guide grooves, the discharge holes are uniformly distributed along the peripheral direction of the rotary fermentation tank and are communicated with the annular guide grooves, biogas residues and biogas slurry enter an annular space formed by the annular guide grooves and the annular grooves from the discharge holes, flow along the annular space, the biogas flows from the air outlet at the upper end of the annular grooves to the air collecting port through a guide pipe, and then the biogas is collected, and the biogas residues and the biogas slurry flow from the residue and liquid outlet at the lower end of the annular grooves to the residue and liquid collecting port through a guide pipe, so that the biogas residues and the biogas slurry are collected.
2. The external rotation continuous anaerobic dry fermentation device according to claim 1, wherein: the pre-storage device comprises at least one conical hopper, each conical hopper is internally and rotatably connected with a spiral stirring device, each spiral stirring device comprises a rotating shaft, a spiral stirring blade and a spiral driving motor, the rotating shafts are rotatably connected in the conical hopper and coaxial with the conical hopper, the spiral stirring blades are fixedly connected to the outer side wall of the rotating shafts, the spiral stirring blades and the rotating shafts are coaxial, and the radius of each spiral stirring blade is gradually reduced from one end corresponding to the large-mouth end of the conical hopper to one end corresponding to the small-mouth end of the conical hopper.
3. The external rotation continuous anaerobic dry fermentation device according to claim 1, wherein: the stirrer is provided with a plurality of stirring units, the stirring units are fixed on the central shaft at intervals, each stirring unit comprises two stirring units, each stirring unit is distributed along the axial direction of the central shaft at intervals, each stirring unit comprises a plurality of stirring rods, each stirring rod in one stirring unit is fixedly connected on the central shaft and uniformly distributed along the circumferential direction of the central shaft, and a fan-shaped scraping plate is fixedly arranged at the top end of each stirring rod.
4. The external rotation continuous anaerobic dry fermentation device according to claim 3, wherein: a plurality of sieve plates are fixedly connected between two stirring units in one stirrer, a plurality of sieve holes with different apertures are formed in each sieve plate, and the sieve holes are randomly distributed on the sieve plates.
5. The external rotation continuous anaerobic dry fermentation device according to claim 1, wherein: the closed shell comprises a first shell and a second shell which are fixedly connected with each other in a sealing way, the inner diameter of the first shell is smaller than that of the second shell, the inner diameter of the first tank body is smaller than that of the second tank body, the first tank body is arranged corresponding to the first shell, the second tank body is arranged corresponding to the second shell, and the feeding pipeline is fixedly connected with the first shell in a sealing way and is in relative rotation sealing connection with the first tank body after passing through the first shell; the central shaft comprises a first shaft section and a second shaft section which are coaxially and fixedly connected, the first shaft section is positioned in the first tank body, the second shaft section is positioned in the second tank body, a spiral conveying blade is fixedly arranged on the outer peripheral surface of the first shaft section, materials can be conveyed from the first tank body to the second tank body by the spiral conveying blade under the rotating action of the rotary fermentation tank, a sleeve is fixedly sleeved on the outer peripheral surface of the second shaft section, and the stirrer is fixedly arranged on the outer peripheral surface of the sleeve.
6. The external rotation continuous anaerobic dry fermentation apparatus according to claim 5, wherein: the spiral heating pipe is fixedly arranged on the inner wall of the second shell, and the axis of the spiral heating pipe is collinear with the axis of the second shell.
7. The external rotation continuous anaerobic dry fermentation device according to claim 1, wherein: the discharging ring is in sealing connection with the peripheral surface of the rotary fermentation tank, the rotary fermentation tank and the feeding pipeline through floating rings, and the air outlet is connected with the air collecting port, the slag liquid outlet and the slag liquid collecting port through hoses.
8. A fermentation process based on the external rotating continuous anaerobic dry fermentation apparatus according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
s1: placing fermentation raw materials into the pre-storage device, enabling the fermentation raw materials to enter the rotary fermentation tank along the feeding pipeline, and performing anaerobic reaction in the rotary fermentation tank;
s2: the rotary driving device drives the rotary fermentation tank to rotate around the central shaft, and the rotating rotary fermentation tank and the stirrer stir fermentation raw materials together;
s3: and the biogas, the biogas residue and the biogas slurry generated in the fermentation process are discharged from the discharge port to the discharge device, then the biogas is discharged from the gas collecting port through the gas outlet, and the biogas residue and the biogas slurry are discharged from the residue liquid collecting port through the residue liquid outlet.
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