CN113322161A - Device and method for producing biogas through biomass energy combined fermentation - Google Patents
Device and method for producing biogas through biomass energy combined fermentation Download PDFInfo
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- 230000004151 fermentation Effects 0.000 title claims abstract description 58
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000010902 straw Substances 0.000 claims abstract description 212
- 238000002791 soaking Methods 0.000 claims abstract description 67
- 239000010865 sewage Substances 0.000 claims abstract description 54
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 11
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- 238000003756 stirring Methods 0.000 claims description 21
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000013517 stratification Methods 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims 1
- 230000002550 fecal effect Effects 0.000 abstract 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 17
- 239000010871 livestock manure Substances 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
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Abstract
The invention discloses a biomass energy combined fermentation biogas production device and method, which comprises a straw sorting chamber, a straw chopping chamber, an ultrasonic crushing chamber, a fecal sewage mixing chamber, a fecal sewage separating chamber, a straw soaking chamber, a fermentation chamber and a biogas residue recycling pipe, wherein the right end of the straw sorting chamber is fixedly connected with the straw chopping chamber, the right end of the straw chopping chamber is fixedly connected with the ultrasonic crushing chamber, the lower end of the straw sorting chamber is fixedly connected with the fecal sewage mixing chamber, the lower end of the ultrasonic crushing chamber is fixedly connected with the straw soaking chamber, the fecal sewage mixing chamber and the interior of the straw soaking chamber are fixedly connected with the fecal sewage separating chamber together, the left end of the straw soaking chamber is fixedly connected with the fermentation chamber, and the left end of the straw sorting chamber is fixedly connected with a straw feeding hole Small secondary pollution and cost saving.
Description
Technical Field
The invention belongs to the technical field of biomass energy, and particularly relates to a device and a method for producing biogas through biomass energy combined fermentation.
Background
China pays great attention to the utilization of biomass energy, and researches and developments on biomass energy utilization technologies such as user methane tanks, firewood-saving kang stoves, large and medium-sized methane projects, biomass briquetting, gasification and gasification power generation, biomass liquid fuels and the like are developed. With the rapid development of the breeding industry in China, the yield of the method of the livestock and poultry manure and the plant straws is increased day by day, the livestock and poultry manure, the plant straws and the waste sewage of the breeding farm contain heavy metals, pathogenic microorganisms and the like, secondary pollution is easy to cause, and meanwhile, the livestock and poultry manure, the plant straws and the waste of the breeding farm contain more organic matters, so that the method has higher resource utilization value. However, the existing fermentation device has some problems: at present, most of biomass treatment and utilization technologies are used for independently treating corresponding dirt, additional microbial agents are mostly needed to be added, the economic cost is high, and the gas production efficiency is low. Therefore, a device and a method for producing biogas by biomass energy combined fermentation need to be designed.
The invention content is as follows:
the invention aims to solve the problems in the prior art by providing a device and a method for producing biogas by biomass energy combined fermentation.
In order to solve the problems, the invention provides a device and a method for producing biogas by biomass energy combined fermentation, wherein the technical scheme comprises the following steps:
a biomass energy combined fermentation biogas production device comprises a straw sorting chamber, a straw chopping chamber, an ultrasonic crushing chamber, a feces mixing chamber, a feces separating chamber, a straw soaking chamber, a fermentation chamber and a biogas residue recycling pipe, wherein the right end of the straw sorting chamber is fixedly connected with the straw chopping chamber, the right end of the straw chopping chamber is fixedly connected with the ultrasonic crushing chamber, the lower end of the straw sorting chamber is fixedly connected with the feces mixing chamber, the lower end of the ultrasonic crushing chamber is fixedly connected with the straw soaking chamber, the feces mixing chamber and the straw soaking chamber are fixedly connected with the feces separating chamber together, the left end of the straw soaking chamber is fixedly connected with the fermentation chamber, the left end of the straw sorting chamber is fixedly connected with a straw feeding port, the straw sorting chamber is fixedly connected with a sorting cylinder fixing device, and the sorting cylinder fixing device is fixedly connected with a straw sorting cylinder, the straw sorting cylinder is fixedly provided with a straw conveying belt inside, the straw chopping chamber is fixedly connected with a straw chopping cylinder inside, the left end of the straw chopping cylinder is fixedly connected with a straw tightening groove, the straw chopping cylinder is rotatably connected with a chopping fixed shaft, the outer side of the chopping fixed shaft is fixedly connected with a chopping knife, the straw chopping cylinder is internally provided with a driving belt, the straw chopping cylinder is provided with a chopping discharge hole, the left end of the excrement and sewage mixing chamber is fixedly connected with an excrement and sewage feeding hole, the excrement and sewage mixing chamber is internally provided with an excrement and sewage stirring shaft, the excrement and sewage separating chamber is internally provided with an excrement and sewage rotating separating hopper, the excrement and sewage rotating separating hopper is provided with a liquid pollutant separating opening, the excrement and sewage separating chamber is provided with a solid pollutant separating opening, and the excrement and sewage separating chamber is fixedly connected with a liquid pollutant discharging opening, the straw soaking chamber is internally provided with a soaking stirring rod, a biogas residue recycling port is formed in the straw soaking chamber, a biogas collecting port is fixedly connected to the fermentation chamber, an outer wall heat-insulating layer is fixedly connected to the outer side of the fermentation chamber, a funnel-shaped biogas residue outlet is fixedly connected to the lower end of the fermentation chamber, and a biogas residue recycling pipe is fixedly connected to the lower end of the funnel-shaped biogas residue outlet.
Preferably, the biogas residue recycling pipe is fixedly connected with a power pump, and is fixedly connected with the biogas residue recycling port.
Preferably, the number of the soaking and stirring rods is two, and the two soaking and stirring rods are symmetrically distributed in the straw soaking chamber.
Preferably, the outer side of the ultrasonic crushing chamber is fixedly connected with a noise reduction wall filler, and the lower end of the ultrasonic crushing chamber is provided with a crushing discharge hole.
Preferably, the left end of the straw soaking chamber is excessively connected with a soaking mixture outlet which is positioned inside the fermentation chamber.
Preferably, the excrement mixing chamber is provided with an excrement discharge port, and the excrement discharge port is positioned at the upper end of the excrement separation chamber.
Preferably, the outer wall heat-insulating layer is made of polystyrene foam board materials, and the outer wall heat-insulating layer is in contact with the funnel-shaped biogas residue outlet.
A method for producing biogas by biomass energy combined fermentation comprises the following specific steps:
the method comprises the following steps: firstly, straws enter a straw sorting chamber for being regulated, the collected straws enter a straw sorting barrel through a straw feeding hole, the straws are limited in the shape of a cylinder of the straw sorting barrel in a straw conveying belt, the messy straws are gradually gathered into a loose cylinder along with the transportation of the straw conveying belt, the straws directly enter a straw chopping barrel in a straw chopping chamber along with the straw conveying belt, the inner diameter of the straw chopping barrel is the same as the inner diameter of the straw sorting barrel, the straws directly enter the front end of the straw chopping barrel and are provided with straw tightening grooves, the loose straws are gradually compressed into compact straw bundles along with the pushing of the straws, and the straw bundles pass through the straw tightening grooves and then enter a transmission belt, the straw is regularly cut into sections by a cutter with a set program, the cut straw enters an ultrasonic crushing chamber through a cutting discharge port, the ultrasonic crushing chamber is provided with ultrasonic equipment, structurally crushing the straws, and feeding the ultrasonically crushed straws into a straw soaking chamber through a crushing discharge port;
step two: when the straws are treated, the excrement and sewage enters an excrement and sewage mixing chamber through an excrement and sewage feeding port, the excrement and sewage mixing chamber is provided with an excrement and sewage stirring shaft, the excrement and sewage entering the excrement and sewage mixing chamber is stirred to prevent solid-liquid separation, the sewage enters an excrement and sewage rotary separation hopper in an excrement and sewage separation chamber through an excrement and sewage discharging port, liquid sewage is separated through a liquid sewage separation port by virtue of slow high-frequency rotation of the excrement and sewage rotary separation hopper, the liquid sewage enters a straw soaking chamber through a liquid sewage discharging port, and solid sewage directly enters a fermentation chamber through a solid sewage separation port to be fermented;
step three: liquid sewage and crushed straws entering the straw soaking chamber are mixed and stirred uniformly and soaked for three to five hours under the action of a soaking stirring rod, then the materials are smoothly slid to a fermentation chamber through a soaking mixture discharge port and are mixed and fermented with solid sewage, an outer wall heat insulation layer is arranged on the outer wall of the fermentation chamber, a biogas collection port is arranged at the upper part of the fermentation chamber, generated biogas is collected in a centralized manner, after the concentration of the biogas detected at the biogas collection port is reduced, a power pump is started, the residual biogas residues in the fermentation chamber enter the straw soaking chamber through a biogas residue recycling pipe through a biogas residue recycling port through a funnel-shaped biogas residue outlet, the residual biogas residues and the next batch of materials are waited to be soaked and fermented again and are circulated sequentially, and electromagnetic control valves are arranged at each connecting port.
The invention has the beneficial effects that: the invention relates to a biomass energy combined fermentation biogas production device and method, which have the characteristics of high biogas production rate, small secondary pollution and cost saving, and compared with the traditional biomass energy combined fermentation biogas production device and method, the biomass energy combined fermentation biogas production device and method have the following beneficial effects in specific use:
the method for producing the biogas by the combined fermentation of the straws and the excrement can combine two biomass energies, improve the biogas production efficiency, reduce the secondary pollution, and reduce the cost such as labor cost and the like.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. a straw sorting chamber; 11. a straw feeding hole; 12. a straw tidying cylinder; 13. a straw conveyor belt; 14. a tidying cylinder fixing device; 2. a straw chopping chamber; 21. a straw chopping cylinder; 22. a straw tightening groove; 23. cutting up the fixed shaft; 24. a chopping knife; 25. a transmission belt; 26. cutting the discharge hole; 3. an ultrasonic crushing chamber; 31. noise reduction wall filler; 32. crushing a discharge hole; 4. a feces mixing chamber; 41. a feces feeding hole; 42. a feces stirring shaft; 43. a feces discharge hole; 5. a manure and sewage separation chamber; 51. rotating the manure separating hopper; 52. a liquid dirt separation opening; 53. a solid dirt separation opening; 54. a liquid dirt feed opening; 6. A straw soaking chamber; 61. soaking the stirring rod; 62. a discharge port for the soaking mixture; 63. a biogas residue recycling port; 7. a fermentation chamber; 71. a biogas collection port; 72. an outer wall insulating layer; 73. a funnel-shaped biogas residue outlet; 8. a biogas residue recycling pipe; 81. a power pump.
The specific implementation mode is as follows:
as shown in fig. 1, the following technical solutions are adopted in the present embodiment:
example (b):
a biomass energy combined fermentation biogas production device comprises a straw sorting chamber 1, a straw chopping chamber 2, an ultrasonic crushing chamber 3, a feces mixing chamber 4, a feces separating chamber 5, a straw soaking chamber 6, a fermentation chamber 7 and a biogas residue recycling pipe 8, wherein the right end of the straw sorting chamber 1 is fixedly connected with the straw chopping chamber 2, the right end of the straw chopping chamber 2 is fixedly connected with the ultrasonic crushing chamber 3, the lower end of the straw sorting chamber 1 is fixedly connected with the feces mixing chamber 4, the lower end of the ultrasonic crushing chamber 3 is fixedly connected with the straw soaking chamber 6, the feces mixing chamber 4 and the interior of the straw soaking chamber 6 are fixedly connected with the feces separating chamber 5 together, the left end of the straw soaking chamber 6 is fixedly connected with the fermentation chamber 7, the left end of the straw sorting chamber 1 is fixedly connected with a straw feeding port 11, and the interior of the straw sorting chamber 1 is fixedly connected with a straw fixing device 14, the inside fixedly connected with straw arrangement section of thick bamboo 12 of arrangement section of thick bamboo fixing device 14, the inside fixed mounting of a straw arrangement section of thick bamboo 12 has straw conveyer belt 13, the inside fixedly connected with straw shredding cylinder 21 of straw shredding chamber 2, the left end fixedly connected with straw tightening groove 22 of a straw shredding cylinder 21, it is connected with cuts up fixed axle 23 to rotate on the straw shredding cylinder 21, the outside fixedly connected with chopper 24 of cutting up fixed axle 23, the inside of a straw shredding cylinder 21 is provided with drive belt 25, the last comminution discharge gate 26 of having seted up of a straw shredding cylinder 21, the left end fixedly connected with excrement feed inlet 41 of excrement and sewage mixing room 4, the inside of excrement and sewage mixing room 4 is provided with excrement and sewage stirring shaft 42, the inside of excrement and sewage separating chamber 5 is provided with excrement and sewage rotary separating hopper 51, liquid filth separation mouth 52 has been seted up on excrement and sewage rotary separating hopper 51, the solid dirt separation chamber 53 is formed in the dirt and excrement separation chamber 5, the liquid dirt feed opening 54 is fixedly connected to the dirt and excrement separation chamber 5, the soaking and stirring rod 61 is arranged inside the straw soaking chamber 6, the biogas residue recycling opening 63 is formed in the straw soaking chamber 6, the biogas collection opening 71 is fixedly connected to the fermentation chamber 7, the outer wall heat preservation layer 72 is fixedly connected to the outer side of the fermentation chamber 7, the funnel-shaped biogas residue outlet 73 is fixedly connected to the lower end of the fermentation chamber 7, and the biogas residue recycling pipe 8 is fixedly connected to the lower end of the funnel-shaped biogas residue outlet 73.
Wherein, the biogas residue recycling pipe 8 is fixedly connected with a power pump 81, the biogas residue recycling pipe 8 is fixedly connected with the biogas residue recycling port 63, and the power pump 81 can provide moving power for the raw materials in the biogas residue recycling pipe 8.
The number of the soaking and stirring rods 61 is two, the two soaking and stirring rods 61 are symmetrically distributed in the straw soaking chamber 6, and the soaking solution can be fully mixed by the two soaking and stirring rods 61.
Wherein, the outer side of the ultrasonic crushing chamber 3 is fixedly connected with a noise reduction wall filler 31, the lower end of the ultrasonic crushing chamber 3 is provided with a crushing discharge port 32, and the crushing discharge port 32 can crush and discharge the raw material straws into the straw soaking chamber 6.
Wherein, the left end of the straw soaking chamber 6 is excessively connected with a soaking mixture outlet 62, the soaking mixture outlet 62 is positioned inside the fermentation chamber 7, and the soaking mixture outlet 62 can discharge soaking liquid into the fermentation chamber 7.
Wherein, the dirty mixing chamber of excrement 4 is last to have seted up the dirty discharge gate 43 of excrement, the dirty discharge gate 43 of excrement is located the upper end of the dirty separating chamber of excrement 5, the dirty discharge gate 43 of excrement can be discharged into the inside of the dirty separating chamber of excrement 5 with the excrement.
The outer wall insulating layer 72 is made of polystyrene foam board material, the outer wall insulating layer 72 is in contact with the funnel-shaped biogas residue outlet 73, and the outer wall insulating layer 72 can insulate the inside of the fermentation chamber 7.
A method for producing biogas by biomass energy combined fermentation comprises the following specific steps:
the method comprises the following steps: firstly, straws enter a straw sorting chamber 1 for being regulated, the collected straws enter a straw sorting barrel 12 through a straw feeding hole 11, the straws are limited in a cylindrical shape of the straw sorting barrel 12 in a straw conveying belt 13, the messy straws are gradually gathered into a loose cylindrical shape along with the transportation of the straw conveying belt 13, the straws directly enter a straw chopping barrel 21 in a straw chopping chamber 2 along with the straw conveying belt 13, the inner diameter of the straw chopping barrel 21 is the same as the inner diameter of the straw sorting barrel 12, the straws directly enter the front end of the straw chopping barrel 21 and are provided with a straw tightening groove 22, the loose straws are gradually compressed into compact straw bundles along with the propulsion of the straws, the straw bundles pass through the straw tightening groove 22 and enter a driving belt 25, the straw bundles are regularly cut into segments through a set program chopping knife 24, the cut straws enter an ultrasonic crushing chamber 3 through a chopping discharge hole 26, and the ultrasonic crushing chamber 3 is provided with ultrasonic equipment, structurally crushing the straws, and feeding the straws subjected to ultrasonic crushing into a straw soaking chamber 6 through a crushing discharge port 32;
step two: during straw treatment, excrement enters the excrement mixing chamber 4 through an excrement inlet 41, an excrement stirring shaft 42 is arranged in the excrement mixing chamber 4, the excrement entering the excrement mixing chamber 4 is stirred to prevent solid-liquid stratification, the excrement enters an excrement rotary separation hopper 51 in an excrement separation chamber 5 through an excrement discharge port 43, the liquid excrement is separated by 52 times through a liquid excrement separation port 51 through slow-speed high-frequency rotation of the excrement rotary separation hopper 51 and enters the straw soaking chamber 6 through a liquid excrement discharge port 54, and the solid excrement directly enters the fermentation chamber 7 through a solid excrement separation port 53 to be fermented;
step three: liquid sewage and crushed straws entering the straw soaking chamber 6 are mixed and stirred uniformly and soaked for three to five hours under the action of the soaking and stirring rod 61, then the materials are smoothly slid to the fermentation chamber 7 through the soaking mixture discharge port 62 to be mixed and fermented with the solid sewage, the outer wall of the fermentation chamber 7 is provided with an outer wall heat insulation layer 72, the upper part of the fermentation chamber is provided with a methane collection port 71, the generated methane is collected in a centralized manner, after the methane concentration detected at the methane collection port 71 is reduced, the power pump 81 is started, the residual methane in the fermentation chamber 7 passes through the funnel-shaped methane residue outlet 73, passes through the methane residue recycling pipe 8 and enters the straw soaking chamber 6 through the methane residue recycling port 63, and waits for being soaked and fermented with the next batch of materials, and circulates sequentially, wherein each connecting port is provided with an electromagnetic control valve.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. The utility model provides a biomass energy jointly ferments and produces biogas device, includes straw arrangement room (1), straw shredding chamber (2), ultrasonic crushing room (3), the dirty mixing chamber of excrement (4), the dirty separating chamber of excrement (5), straw soak room (6), fermentation chamber (7), natural pond sediment retrieval and utilization pipe (8), its characterized in that: the straw chopping machine is characterized in that a straw chopping chamber (2) is fixedly connected to the right end of the straw chopping chamber (1), an ultrasonic chopping chamber (3) is fixedly connected to the right end of the straw chopping chamber (2), a dirty uniform mixing chamber (4) of excrement is fixedly connected to the lower end of the straw chopping chamber (1), a straw soaking chamber (6) is fixedly connected to the lower end of the ultrasonic chopping chamber (3), the dirty uniform mixing chamber (4) of excrement and the dirty separating chamber (5) of excrement are fixedly connected to the inside of the straw soaking chamber (6), a fermentation chamber (7) is fixedly connected to the left end of the straw soaking chamber (6), a straw feeding port (11) is fixedly connected to the left end of the straw chopping chamber (1), a sorting cylinder fixing device (14) is fixedly connected to the inside of the straw chopping chamber (1), and a straw sorting cylinder (12) is fixedly connected to the inside of the sorting cylinder fixing device, the straw sorting barrel (12) is internally and fixedly provided with a straw conveyor belt (13), the straw chopping barrel (21) is fixedly connected with the straw chopping barrel (2), the left end of the straw chopping barrel (21) is fixedly connected with a straw tightening groove (22), the straw chopping barrel (21) is rotatably connected with a chopping fixed shaft (23), the outer side of the chopping fixed shaft (23) is fixedly connected with a chopping knife (24), the straw chopping barrel (21) is internally provided with a transmission belt (25), the straw chopping barrel (21) is provided with a chopping discharge hole (26), the left end of the excrement and sewage mixing chamber (4) is fixedly connected with an excrement and sewage feeding hole (41), the excrement and sewage mixing chamber (4) is internally provided with an excrement and sewage mixing stirring shaft (42), the excrement and sewage separating chamber (5) is internally provided with an excrement and sewage rotating separating hopper (51), and the excrement and sewage rotating separating hopper (51) is provided with a liquid pollutant separating port (52), the solid dirt separating port (53) is formed in the dirt-and-feces separating chamber (5), the liquid dirt discharging port (54) is fixedly connected to the dirt-and-feces separating chamber (5), the soaking stirring rod (61) is arranged inside the straw soaking chamber (6), the biogas residue recycling port (63) is formed in the straw soaking chamber (6), the biogas collecting port (71) is fixedly connected to the fermenting chamber (7), the outer wall heat-insulating layer (72) is fixedly connected to the outer side of the fermenting chamber (7), the funnel-shaped biogas residue outlet (73) is fixedly connected to the lower end of the fermenting chamber (7), and the biogas residue recycling pipe (8) is fixedly connected to the lower end of the funnel-shaped biogas residue outlet (73).
2. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: the biogas residue recycling pipe (8) is fixedly connected with a power pump (81), and the biogas residue recycling pipe (8) is fixedly connected with the biogas residue recycling port (63).
3. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: the number of the soaking and stirring rods (61) is two, and the two soaking and stirring rods (61) are symmetrically distributed in the straw soaking chamber (6).
4. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: the outer side of the ultrasonic crushing chamber (3) is fixedly connected with a noise reduction wall filler (31), and the lower end of the ultrasonic crushing chamber (3) is provided with a crushing discharge hole (32).
5. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: the left end of the straw soaking chamber (6) is connected with a soaking mixture outlet (62) in an overlarge way, and the soaking mixture outlet (62) is positioned inside the fermentation chamber (7).
6. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: and a feces discharge port (43) is formed in the feces mixing chamber (4), and the feces discharge port (43) is located at the upper end of the feces separation chamber (5).
7. The device for producing biogas through biomass energy combined fermentation according to claim 1, wherein: the outer wall heat-insulating layer (72) is made of polystyrene foam board materials, and the outer wall heat-insulating layer (72) is in contact with the funnel-shaped biogas residue outlet (73).
8. A method for producing biogas by biomass energy combined fermentation is characterized in that: the method comprises the following specific steps:
the method comprises the following steps: firstly, straws enter a straw sorting chamber (1) for being regulated, the collected straws enter a straw sorting barrel (12) through a straw feeding hole (11), the straws are in a straw conveying belt (13) and limited in the cylindrical shape of the straw sorting barrel (12), messy straws are gradually gathered into a loose cylindrical shape along with the transportation of the straw conveying belt (13), the straws directly enter a straw chopping barrel (21) in a straw chopping chamber (2) along with the straw conveying belt (13), the inner diameter of the straw chopping barrel (21) is the same as the inner diameter of the straw sorting barrel (12), the front end of the straw directly entering the straw chopping barrel (21) is provided with a straw tightening groove (22), the loose straws are gradually compressed into compact straw bundles along with the propulsion of the straws, the compact straw bundles pass through the straw tightening groove (22) and then enter a driving belt (25), and the compact straw bundles are regularly cut into sections through a set program chopping knife (24), the cut straws enter an ultrasonic crushing chamber (3) through a crushing discharge hole (26), ultrasonic equipment is arranged in the ultrasonic crushing chamber (3) to structurally crush the straws, and the straws crushed by the ultrasonic enter a straw soaking chamber (6) through a crushing discharge hole (32);
step two: when the straws are treated, excrement enters an excrement mixing chamber (4) through an excrement feeding port (41), an excrement stirring shaft (42) is arranged in the excrement mixing chamber (4), the excrement entering the excrement mixing chamber (4) is stirred to prevent solid-liquid stratification, the excrement enters an excrement rotary separating hopper (51) in an excrement separating chamber (5) through an excrement discharging port (43), the liquid excrement is separated through a liquid excrement separating port (52) by virtue of slow-speed high-frequency rotation of the excrement rotary separating hopper (51), the liquid excrement enters a straw soaking chamber (6) through a liquid excrement discharging port (54), and the solid excrement directly enters a fermentation chamber (7) through a solid excrement separating port (53) to be fermented;
step three: liquid sewage and crushed straws entering the straw soaking chamber (6) are mixed and stirred uniformly and soaked for three to five hours under the action of a soaking stirring rod (61), then the materials are smoothly slid to the fermentation chamber (7) through a soaking mixture discharge hole (62) and are mixed and fermented with the solid sewage, an outer wall heat preservation layer (72) is arranged on the outer wall of the fermentation chamber (7), a biogas collection hole (71) is formed in the upper part of the outer wall of the fermentation chamber (7), generated biogas is collected in a centralized mode, a power pump (81) is started after the concentration of the biogas detected at the biogas collection hole (71) is reduced, the residual biogas residues in the fermentation chamber (7) enter the straw soaking chamber (6) through a funnel-shaped biogas residue outlet (73) and a biogas residue reuse pipe (8) and a biogas residue reuse hole (63), the liquid sewage and the crushed straws are soaked and fermented with the next batch of materials, and the process of circulation is carried out sequentially, wherein electromagnetic control valves are arranged at each connecting hole.
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