CN211005365U - Material stirring device for producing biogas through anaerobic fermentation - Google Patents

Abstract

The embodiment of the utility model discloses a material stirring device for producing biogas through anaerobic fermentation, which relates to the field of garbage treatment, and comprises a fermentation tank, a guide cylinder, a biogas circulating treatment device, a first circulating device and a second circulating device, wherein the upper part of the side wall of the fermentation tank is provided with a first circulating outlet and three first circulating inlets, and the lower part of the side wall of the fermentation tank is provided with a feeding pipe, a second circulating inlet and a second circulating outlet; a liquid inlet of the first circulating device is communicated with the first circulating outlet, and a liquid outlet of the first circulating device is communicated with the second circulating inlet; the liquid inlet of the second circulating device is communicated with the second circulating outlet, and the liquid outlet of the second circulating device is communicated with the first circulating inlet. Compare in traditional mechanical stirring device, the utility model discloses agitating unit stirring process is more energy-conserving, and the operation is more stable, can effectively reduce the running cost, is applicable to large-scale fermentation cylinder, stirs more fully, better realization material homogeneity and heat conduction.

Description

Material stirring device for producing biogas through anaerobic fermentation

Technical Field

The embodiment of the utility model relates to the field of garbage treatment, concretely relates to material mixing device of marsh gas is produced in anaerobic fermentation.

Background

Kitchen waste or other organic waste (kitchen waste, livestock and poultry manure and the like) is rich in biological organic matters, and the organic waste is treated by adopting a methane production mode through anaerobic fermentation at home and abroad so as to realize solid waste treatment and simultaneously produce biomass energy.

The anaerobic fermentation process needs to be continuously and effectively stirred, so that the homogeneity of materials in the anaerobic fermentation tank is ensured, the heat conduction is promoted, the microorganisms in the fermentation tank are fully contacted with the fermentation materials, and the intermediate process products are rapidly dispersed and finally degraded.

The existing anaerobic fermentation reactor generally adopts a mechanical stirring mode as a main mode to realize uniform mixing and homogenization, the stirring mode is better applied in small and medium-sized fermentation tanks, but for large-sized anaerobic fermentation tanks with monomer volume of more than 3000 cubic meters, a mechanical stirring device needs to be longer to process and has larger stirring radius, so that the processing and production difficulty of equipment is improved, and the aim of material homogenization is difficult to realize; in addition, because the mechanical stirring device needs to be immersed in the fermented materials, the daily maintenance is difficult.

The stirring form that current anaerobic fermentation jar adopted requires highly to the material, and the material that domestic usually requires to get into anaerobic fermentation jar gets rid of interferents such as almost all impurity and grease, and this material pretreatment systems that leads to solid useless anaerobic fermentation such as current kitchen garbage to produce marsh gas facility is very complicated, leads to on the one hand that construction and operation cost are high, the degree of difficulty is big, and on the other hand too meticulous pretreatment systems leads to that the organic matter of the material that the fermentation jar received loses seriously, total marsh gas output rate is lower.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides a material stirring device and method of marsh gas is produced in anaerobic fermentation to solve the problem that current anaerobic fermentation reactor exists the production degree of difficulty big, be difficult to realize the material homogeneity, the maintenance degree of difficulty is big, require higher and the marsh gas output rate is low to the material.

In order to achieve the above object, an embodiment of the present invention provides a material stirring device for producing biogas through anaerobic fermentation, the material stirring device for producing biogas through anaerobic fermentation includes a fermentation tank, a draft tube, a biogas circulation processing device, a first circulation device and a second circulation device, the upper portion of the side wall of the fermentation tank is provided with at least one first circulation outlet and at least one first circulation inlet, the lower portion of the side wall of the fermentation tank is provided with a feeding pipe, at least one second circulation inlet and at least one second circulation outlet, and the top of the fermentation tank is provided with a biogas outlet; the liquid inlet of the first circulating device is communicated with the first circulating outlet, the liquid outlet of the first circulating device is communicated with the second circulating inlet, and the first circulating device is used for circulating the material on the upper part of the fermentation tank to the bottom of the fermentation tank so that the material is dissolved in the fermentation liquid and is degraded by microorganisms; the guide flow cylinder is arranged in the fermentation tank, and a plurality of methane spray heads are arranged in the guide flow cylinder; a liquid inlet of the second circulating device is communicated with a second circulating outlet, a liquid outlet of the second circulating device is communicated with a first circulating inlet, the first circulating inlet extends to the position above an upper port of the guide cylinder, and the second circulating device is used for circulating the material at the bottom of the fermentation tank to the upper part of the fermentation tank; the biogas recycling device is used for collecting biogas at the top of the fermentation tank, sequentially compressing, purifying and storing the collected biogas, and conveying the processed biogas to the biogas spray heads.

Further, first circulating device includes first valve, second valve and first circulating pump, the inlet and the first circulation export intercommunication of first valve, the inlet of first circulating pump communicates with the liquid outlet of first valve, the inlet of second valve respectively, the liquid outlet and the second circulation entry intercommunication of first circulating pump.

Further, the second circulating device comprises a third valve, a fourth valve, a second circulating pump and a cyclone sand removing machine, a liquid inlet of the third valve is communicated with a second circulating outlet, a liquid outlet of the third valve is communicated with a liquid inlet of the second circulating pump, a liquid outlet of the second circulating pump is communicated with a liquid inlet of the cyclone sand removing machine, a liquid outlet of the cyclone sand removing machine is communicated with a liquid inlet of the fourth valve, and a liquid outlet of the fourth valve is communicated with the first circulating inlet.

Furthermore, the second circulating device further comprises a fifth valve, at least one third circulating inlet is formed in the lower portion of the side wall of the fermentation tank, the height of the third circulating inlet is higher than that of the second circulating outlet, the third circulating inlet and the second circulating inlet are arranged in a counter clock mode, a liquid inlet of the fifth valve is communicated with a liquid outlet of the second circulating pump, and a liquid outlet of the fifth valve is communicated with the third circulating inlet.

Further, the biogas circulation treatment device comprises a biogas compressor, a sulfuric acid washing tower, a demister, a storage tank and an air valve, wherein an air inlet of the biogas compressor is communicated with a biogas outlet, an air outlet of the biogas compressor is communicated with an air inlet of the sulfuric acid washing tower, an air outlet of the sulfuric acid washing tower is communicated with an air inlet of the demister, an air outlet of the demister is communicated with an air inlet of the storage tank, and an air outlet of the storage tank is communicated with air inlets of a plurality of biogas spray heads through the air valve.

Furthermore, the material stirring device for producing biogas through anaerobic fermentation further comprises a heater, the heater is arranged in the guide shell and is positioned above the biogas spray head, and a hot water inlet and a hot water outlet of the heater sequentially penetrate through the guide shell and the side wall of the fermentation tank and are communicated with the heat supply equipment.

Further, the middle part of the bottom plate of the fermentation tank is downwards sunken to form a concave part, and the second circulation outlet extends into the concave part.

Furthermore, the size of the upper port of the guide shell is larger than that of the lower port of the guide shell, and a guide plate is arranged at the upper port of the guide shell.

Correspondingly, the embodiment of the utility model provides a material stirring method of anaerobic fermentation production marsh gas still provides, material stirring method of anaerobic fermentation production marsh gas includes following step:

step a, circulating materials on the upper part of a fermentation tank to the bottom of the fermentation tank to dissolve the materials in a fermentation solution and degrade the materials by microorganisms;

b, circulating the material at the bottom of the fermentation tank to the upper part of the fermentation tank to homogenize the material in the fermentation tank and conduct heat;

c, circulating the material at the bottom of the fermentation tank upwards to a preset height, and forming an anticlockwise rotational flow at the bottom of the fermentation tank under the combined action of the material circulated to the bottom of the fermentation tank and the material;

d, collecting the methane at the top of the fermentation tank, and sequentially compressing, purifying and storing the collected methane;

and e, conveying the purified methane into the guide cylinder, and mixing the methane and the fermentation liquor to form a low-density gas-liquid mixture.

Further, the following steps are also executed while the step e is executed: the gas-liquid mixture is heated using a heater.

The embodiment of the utility model provides a have following advantage:

1. the material stirring device for producing methane by anaerobic fermentation of the embodiment of the utility model circulates the material on the upper part of the fermentation tank to the bottom of the fermentation tank by the first circulating device; circulating the material at the bottom of the fermentation tank to the upper part of the fermentation tank through a second circulating device; conveying the purified methane into the guide shell through a methane circulating treatment device to enable fermentation liquor in the guide shell to flow upwards, so that the fermentation liquor between the guide shell and the fermentation tank flows downwards; compare in traditional mechanical stirring device, the utility model discloses agitating unit stirring process is more energy-conserving, can effectively reduce the running cost.

2. The utility model discloses agitating unit is applicable in large-scale fermentation cylinder, and the stirring is more abundant, better realization material homogeneity and heat conduction.

3. The utility model discloses in the fermentation cylinder owing to do not have the moving part of mechanical stirring, make the maintenance cycle of fermentation cylinder prolong by a wide margin, reduce and maintain the degree of difficulty and cost.

4. The utility model discloses agitating unit can take off the ammonia nitrogen in the zymotic fluid, avoids anaerobic fermentation process ammonia nitrogen to restrain.

5. The utility model discloses agitating unit can make the fermentation cylinder can handle the fermentation material that contains more impurity and grease, reduces the fermentation material preliminary treatment degree of difficulty.

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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a schematic structural view of a material stirring device for producing biogas through anaerobic fermentation according to an embodiment of the present invention;

fig. 2 is a flow chart of a material stirring method for producing biogas by anaerobic fermentation according to an embodiment of the present invention.

Description of reference numerals: 10. a fermentation tank; 11. a first recycle outlet; 12. a first circulation inlet; 13. a feed pipe; 14. a second recycle inlet; 15. a second recycle outlet; 16. a biogas outlet; 17. a recess; 20. a draft tube; 21. a biogas spray head; 22. a heater; 23. a baffle; 31. a biogas compressor; 32. a sulfuric acid washing tower; 33. a demister; 34. storing the tank; 35. an air valve; 41. a first valve; 42. a second valve; 43. a first circulation pump; 44. a top material discharge port; 51. a third valve; 52. a fourth valve; 53. a second circulation pump; 54. cyclone sand removing machine; 55. a fifth valve; 56. a third recycle inlet; 57. and a material outlet at the bottom.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the material stirring device for producing biogas through anaerobic fermentation comprises a fermentation tank 10, a guide cylinder 20, a biogas circulation processing device, a first circulation device and a second circulation device, wherein the upper part of the side wall of the fermentation tank 10 is provided with a first circulation outlet 11 and three first circulation inlets 12, the three first circulation inlets 12 are equidistantly and alternately arranged on the upper part of the side wall of the fermentation tank 10, the distance between the three first circulation inlets 12 and the liquid level inside the fermentation tank 10 (the fermentation tank 10 is provided with an overflow port, so that the liquid level is constant) is more than 1.5m, so that the liquid sprayed out from the three first circulation inlets 12 has a strong impact effect, scum or floating oil on the top can be pushed to the first circulation outlet 11 for discharging the scum or floating oil, a feeding pipe 13, a second circulation inlet 14 and a second circulation outlet 15 are arranged on the lower part of the side wall of the fermentation tank 10, the pretreated organic waste slurry is conveyed into the fermentation tank 10 through the feeding pipe 13, the waste feeding pipe 13 is bent downwards so that the spout of the feeding pipe 13 is downward, the organic slurry is sprayed out from the spout of the fermentation tank, the feeding pipe 13 is sprayed out from the fermentation tank, the bottom of the fermentation tank 10, the anaerobic fermentation tank 10 is more reasonably, the distance between the bottom of the feeding pipe is 0.5 and the bottom of the fermentation tank 10, the fermentation tank 10 is more reasonably controlled by the anaerobic fermentation tank, the distance between the anaerobic fermentation tank 10 and the bottom plate, the fermentation tank, the anaerobic fermentation tank is controlled by the fermentation tank, the anaerobic slurry is controlled by the anaerobic slurry, the anaerobic slurry is controlled by the anaerobic slurry, the.

The first circulating device is used for circulating the materials at the upper part of the fermentation tank 10 to the bottom of the fermentation tank 10, so that the materials are dissolved in the fermentation liquor and are degraded by microorganisms; first circulating device includes first valve 41, second valve 42 and first circulating pump 43, the inlet of first valve 41 is first circulating device's inlet, the inlet of first valve 41 and first circulation export 11 intercommunication, the inlet of first circulating pump 43 respectively with the liquid outlet of first valve 41, the inlet of second valve 42 communicates, the liquid outlet of first circulating pump 43 is first circulating device's liquid outlet, the liquid outlet of first circulating pump 43 and second circulation entry 14 intercommunication, the liquid outlet of second valve 42 is top material discharge port 44. When the first circulation pump 43 is in operation, the materials in the upper part of the fermentation tank 10 flow to the second circulation inlet 14 through the first circulation outlet 11 under the pumping action of the first circulation pump 43, so that the materials in the upper part are circulated to the bottom. Grease or other light organic matters in the kitchen waste slurry float on the top once floating, and the part of materials cannot be degraded once floating because microorganisms cannot enter a grease layer, and through the circulation process, the grease on the top flows to the second circulation inlet 14 through the first circulation outlet 11, and the grease or other light organic matters are dissolved into the fermentation liquor again and degraded by the microorganisms.

In addition, by adjusting the opening and closing of the first valve 41 and the second valve 42, the same set of pipes can be used to discharge the top material from the fermentation tank 10 through the top material discharge port 44. This operation is used to discharge top non-degradable lightweight floating objects (such as plastics, etc.), and in addition, the above process realizes two purposes of the same pipeline, effectively reducing the construction cost.

The guide shell 20 is arranged in the fermentation tank 10, the guide shell 20 and the fermentation tank 10 are coaxially arranged, a plurality of methane spray heads 21 are arranged in the guide shell 20, the methane spray heads 21 are used for spraying purified methane into the guide shell 20, the guide shell 20 is positioned above a nozzle of the feed pipe 13, the size of an upper port of the guide shell 20 is larger than that of a lower port of the guide shell 20, and the inclination angle of the side wall of the guide shell 20 is 5 degrees, so that the design is favorable for preventing a gas-liquid mixture from contacting with the side wall of the guide shell 20 in a large area to form large bubbles, destroying the form of the gas-liquid mixture and enabling the liquid; in addition, the upper port of the guide shell 20 is provided with a guide plate 23, the diameter of the guide plate 23 is half of the diameter of the top of the guide shell 20, and the guide plate 23 is beneficial to diffusing the floating light impurities to the periphery of the fermentation tank 10 and smoothly discharging the floating light impurities from the first circulation outlet 11.

The second circulating device is used for circulating the material at the bottom of the fermentation tank 10 to the upper part of the fermentation tank 10, the second circulating device comprises a third valve 51, a fourth valve 52, a second circulating pump 53 and a cyclone desander 54, a liquid inlet of the third valve 51 is a liquid inlet of the second circulating device, a liquid inlet of the third valve 51 is communicated with the second circulating outlet 15, a liquid outlet of the third valve 51 is communicated with a liquid inlet of the second circulating pump 53, a liquid outlet of the second circulating pump 53 is communicated with a liquid inlet of the cyclone desander 54, a liquid outlet of the cyclone desander 54 is communicated with a liquid inlet of the fourth valve 52, a sand discharging port of the cyclone desander 54 is a bottom material discharging port 57, a liquid outlet of the fourth valve 52 is a liquid outlet of the second circulating device, a liquid outlet of the fourth valve 52 is communicated with the first circulating inlet 12, and the first circulating inlet 12 extends to the upper part of the guide cylinder 20. The second circulation device further promotes the homogenization and heat conduction of the materials in the fermentation tank 10, the materials at the bottom of the fermentation tank 10 flow to the first circulation inlet 12 through the second circulation outlet 15 under the pumping action of the second circulation pump 53, so that the bottom liquid and the materials are circulated to the top, and in the process, through the cyclone sand remover 54, the sandstone impurities with high specific gravity are discharged through the bottom material discharge port 57, so that the long-term stable operation of the fermentation tank 10 is ensured. Further, in order to ensure that as much material as possible is circulated, the middle of the bottom plate of the fermentation tank 10 is recessed downwards forming a recess 17, and the second circulation outlet 15 extends into the recess 17.

Further, the second circulation device further comprises a fifth valve 55, a third circulation inlet 56 is correspondingly arranged at the lower part of the side wall of the fermentation tank 10, the height of the third circulation inlet 56 is higher than that of the second circulation outlet 15, and the third circulation inlet 56 and the second circulation inlet 14 are arranged in a counter-clockwise manner, so that the sprayed materials can form a counterclockwise rotational flow at the bottom of the fermentation tank 10. A liquid inlet of the fifth valve 55 is communicated with a liquid outlet of the second circulation pump 53, and a liquid outlet of the fifth valve 55 is communicated with the third circulation inlet 56. When the second circulation pump 53 is operated, the bottom liquid and the materials are circulated between different positions in the lower part of the fermenter 10 by controlling the opening and closing of the third valve 51, the fourth valve 52 and the fifth valve 55 to make the bottom materials flow to the third circulation inlet 56 through the second circulation outlet 15. In addition, the second circulation device can also utilize the same set of pipelines to realize that the bottom material flows to the bottom material outlet 57 through the second circulation outlet 15 and is discharged out of the fermentation tank 10. The non-degradable sediment (such as silt) at the bottom is discharged in the process, and in addition, the three purposes of the same set of pipeline are realized in the process, so that the construction cost is reduced. The materials at the upper part of the fermentation tank 10 are circulated to the bottom of the fermentation tank 10 through the first circulation device, and the materials at the bottom of the fermentation tank 10 are circulated to the upper part of the fermentation tank 10 through the second circulation device, so that compared with the traditional mechanical stirring device, the stirring process of the stirring device is more energy-saving, and the operation cost can be effectively reduced; compare in traditional mechanical agitating unit, the agitating unit of this embodiment is more applicable to large-scale fermentation cylinder 10 and stirs more fully, better realization material homogeneity and heat conduction. Compare in traditional fermentation cylinder 10, the agitating unit of this embodiment can make fermentation cylinder 10 can handle the fermentation material that contains more impurity and grease, reduces the fermentation material preliminary treatment degree of difficulty, and it is verified through the experiment, and the fermentation cylinder 10 of this embodiment can handle the organic waste thick liquids that contain more impurity, is not higher than 5% grease, is not higher than 0.5% plastics, is not higher than the organic waste material of 2% silt class impurity.

The biogas circulation processing device is used for collecting biogas at the top of the fermentation tank 10, sequentially compressing, purifying and storing the collected biogas, and conveying the processed biogas to the biogas spray head 21. The biogas circulation treatment device comprises a biogas compressor 31, a sulfuric acid washing tower 32, a demister 33, a storage tank 34 and an air valve 35, wherein an air inlet of the biogas compressor 31 is an air inlet of the biogas circulation treatment device, an air inlet of the biogas compressor 31 is communicated with a biogas outlet 16, an air outlet of the biogas compressor 31 is communicated with an air inlet of the sulfuric acid washing tower 32, an air outlet of the sulfuric acid washing tower 32 is communicated with an air inlet of the demister 33, an air outlet of the demister 33 is communicated with an air inlet of the storage tank 34, an air outlet of the storage tank 34 is an air outlet of the biogas circulation treatment device, and an air outlet of the storage tank 34 is communicated with air inlets of a plurality.

The biogas at the upper part of the fermentation tank 10 firstly enters a biogas compressor 31 for compression, the compressed biogas enters a sulfuric acid washing tower 32 through a gas pipeline, the biogas removes ammonia in fermentation liquor, so that the biogas contains ammonia (the empirical value of the ammonia concentration in the biogas is 200 plus 600ppm), the ammonia in the biogas containing ammonia is removed when the biogas passes through the sulfuric acid washing tower 32, the biogas after ammonia removal is sprayed into the fermentation liquor to blow out the ammonia in the fermentation liquor again, the ammonia nitrogen concentration in the fermentation liquor is reduced (the empirical value is that the ammonia nitrogen concentration can be reduced from 5500 mg/L to 1500 mg/L) in the continuous circulating biogas stirring process, the ammonia nitrogen inhibition problem in the high-solid fermentation process of kitchen waste is solved, the biogas after ammonia removal enters a demister 33, water mist in the biogas is gathered into water and discharged from a water outlet of the demister 33 when the biogas flows through the demister 33, the biogas without water finally enters a 34 for storage and pressure maintenance, the compressed biogas is sprayed out through a biogas spray nozzle 21 and forms a gas-liquid mixture, the low-density flow guide cylinder 20 in the guide cylinder 20, the fermentation tank 20 promotes the biogas to flow of the fermentation tank 20 to form a biogas fermentation tank 20, the fermentation tank 10 and the fermentation tank 10 can stably flow of the fermentation tank 10, the fermentation tank 10 can stably flows upwards and the fermentation tank.

Further, in a preferred embodiment of the present invention, the material stirring apparatus for producing biogas through anaerobic fermentation further comprises a heater 22, the heater 22 is disposed in the draft tube 20 and located above the biogas nozzle 21, and a hot water inlet and a hot water outlet of the heater 22 sequentially pass through the draft tube 20 and the side wall of the fermentation tank 10 and then communicate with the heat supply device. When the heater 22 works, part of the gas-liquid mixture mixed with the biogas is contacted with the heater 22 in the floating process, the gas-liquid mixture is heated by the heater 22, the density of the heated gas-liquid mixture is further reduced, the floating of the part of the gas-liquid mixture is effectively promoted, and the heat conduction is facilitated. The heater 22 is arranged above the biogas spray head 21, so that the gas-liquid mixture can be conveniently contacted with the heater 22 in the floating process, the heater 22 also has small bottom diameter and large top diameter, and the inclination angle of the side wall of the heater 22 is 5 degrees, so that the design is favorable for the fermentation liquor to be fully contacted with the heater 22 in the floating process, and the heat exchange efficiency is improved.

Correspondingly, as shown in fig. 2, the utility model also provides a material stirring method for producing biogas by anaerobic fermentation, which comprises the following steps:

step a, circulating the materials on the upper part of the fermentation tank 10 to the bottom of the fermentation tank 10 to dissolve the materials in the fermentation liquid and degrade the materials by microorganisms;

b, circulating the materials at the bottom of the fermentation tank 10 to the upper part of the fermentation tank 10 to homogenize the materials in the fermentation tank 10 and conduct heat;

step c, circulating the materials at the bottom of the fermentation tank 10 upwards to a preset height, and forming a counterclockwise rotational flow at the bottom of the fermentation tank 10 by the combined action of the materials and the materials which are circulated to the bottom of the fermentation tank 10;

d, collecting the biogas at the top of the fermentation tank 10, and sequentially compressing, purifying and storing the collected biogas;

and e, conveying the purified methane into the guide cylinder 20, and mixing the methane and the fermentation liquor to form a low-density gas-liquid mixture.

Further, the following steps are also executed while the step e is executed: the gas-liquid mixture is heated using the heater 22.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (8)

1. The material stirring device for producing the biogas through anaerobic fermentation is characterized by comprising a fermentation tank, a guide cylinder, a biogas circulating treatment device, a first circulating device and a second circulating device, wherein at least one first circulating outlet and at least one first circulating inlet are formed in the upper part of the side wall of the fermentation tank, a feeding pipe, at least one second circulating inlet and at least one second circulating outlet are formed in the lower part of the side wall of the fermentation tank, and a biogas outlet is formed in the top of the fermentation tank; the liquid inlet of the first circulating device is communicated with the first circulating outlet, the liquid outlet of the first circulating device is communicated with the second circulating inlet, and the first circulating device is used for circulating the material on the upper part of the fermentation tank to the bottom of the fermentation tank so that the material is dissolved in the fermentation liquid and is degraded by microorganisms; the guide flow cylinder is arranged in the fermentation tank, and a plurality of methane spray heads are arranged in the guide flow cylinder; a liquid inlet of the second circulating device is communicated with a second circulating outlet, a liquid outlet of the second circulating device is communicated with a first circulating inlet, the first circulating inlet extends to the position above an upper port of the guide cylinder, and the second circulating device is used for circulating the material at the bottom of the fermentation tank to the upper part of the fermentation tank; the biogas recycling device is used for collecting biogas at the top of the fermentation tank, sequentially compressing, purifying and storing the collected biogas, and conveying the processed biogas to the biogas spray heads.

2. The material stirring device for producing biogas through anaerobic fermentation as claimed in claim 1, wherein the first circulation device comprises a first valve, a second valve and a first circulation pump, a liquid inlet of the first valve is communicated with the first circulation outlet, a liquid inlet of the first circulation pump is respectively communicated with a liquid outlet of the first valve and a liquid inlet of the second valve, and a liquid outlet of the first circulation pump is communicated with the second circulation inlet.

3. The material stirring device for producing the biogas through the anaerobic fermentation as claimed in claim 2, wherein the second circulating device comprises a third valve, a fourth valve, a second circulating pump and a cyclone desander, a liquid inlet of the third valve is communicated with the second circulating outlet, a liquid outlet of the third valve is communicated with a liquid inlet of the second circulating pump, a liquid outlet of the second circulating pump is communicated with a liquid inlet of the cyclone desander, a liquid outlet of the cyclone desander is communicated with a liquid inlet of the fourth valve, and a liquid outlet of the fourth valve is communicated with the first circulating inlet.

4. The material stirring device for producing biogas through anaerobic fermentation of claim 3, wherein the second circulating device further comprises a fifth valve, at least one third circulating inlet is arranged at the lower part of the side wall of the fermentation tank, the height of the third circulating inlet is higher than that of the second circulating outlet, the third circulating inlet and the second circulating inlet are arranged in a counter clock manner, a liquid inlet of the fifth valve is communicated with a liquid outlet of the second circulating pump, and a liquid outlet of the fifth valve is communicated with the third circulating inlet.

5. The material stirring device for producing the biogas through the anaerobic fermentation according to claim 1, 2, 3 or 4, wherein the biogas circulation treatment device comprises a biogas compressor, a sulfuric acid washing tower, a demister, a storage tank and a gas valve, wherein a gas inlet of the biogas compressor is communicated with a biogas outlet, a gas outlet of the biogas compressor is communicated with a gas inlet of the sulfuric acid washing tower, a gas outlet of the sulfuric acid washing tower is communicated with a gas inlet of the demister, a gas outlet of the demister is communicated with a gas inlet of the storage tank, and a gas outlet of the storage tank is communicated with gas inlets of a plurality of biogas spray heads through the gas valve.

6. The material stirring device for producing biogas through anaerobic fermentation as claimed in claim 5, wherein the material stirring device for producing biogas through anaerobic fermentation further comprises a heater, the heater is arranged in the guide shell and is positioned above the biogas spray head, and a hot water inlet and a hot water outlet of the heater are communicated with the heat supply equipment after sequentially passing through the guide shell and the side wall of the fermentation tank.

7. The material stirring device for producing biogas through anaerobic fermentation according to claim 1, 2, 3 or 4, wherein the bottom plate of the fermentation tank is depressed downwards to form a concave part, and the second recycling outlet extends into the concave part.

8. The material stirring device for producing the biogas through the anaerobic fermentation according to claim 1, 2, 3 or 4, wherein the size of the upper port of the guide shell is larger than that of the lower port of the guide shell, and the guide shell is provided with a guide plate at the upper port.

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