CN210237608U - Corn stalk anaerobic dry fermentation biogas slurry reflux methane production increasing device - Google Patents
Corn stalk anaerobic dry fermentation biogas slurry reflux methane production increasing device Download PDFInfo
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Abstract
The utility model relates to a corn stalk anaerobism dry fermentation natural pond liquid backward flow yield increase methane device, include: the anaerobic dry fermentation tank is characterized in that the upper part of the tank body is provided with a feed hole and a liquid inlet hole, the top end of the tank body is provided with an air outlet hole, and the bottom of the tank body is provided with a biogas slurry outlet; the biogas slurry storage tank is provided with a storage tank liquid inlet and a storage tank liquid outlet, the storage tank liquid inlet is communicated with the biogas slurry outlet of the anaerobic dry fermentation tank through a pipeline, and the biogas slurry outlet of the biogas slurry storage tank is communicated with a liquid inlet hole of the anaerobic dry fermentation tank through a pipeline; the biogas slurry reflux pump is arranged inside the biogas slurry storage tank and communicated with the pipeline; the liquid distributor comprises a main pipe and a plurality of branch pipes, holes are formed in the branch pipes, the branch pipes are evenly sprayed above the fermentation materials through biogas slurry backflow, the problems that a fermentation system is easy to acidify and has overhigh local temperature and the like due to high material concentration are avoided in the dry fermentation process, and the breakdown of the fermentation system is prevented.
Description
Technical Field
The utility model relates to a biological fermentation equipment technical field, concretely relates to corn stalk anaerobism dry fermentation natural pond liquid backward flow yield-increasing methane device.
Background
Corn is a crop which is mainly used as a feed and is also used as a grain, channel and feed, and corn straw is used as an agricultural waste which contains rich nutrition and available components and is also an important resource for industrial and agricultural production. Each year, the agricultural production of China produces more than 7 hundred million tons of straws, and the corn straws account for more than 50 percent. How to change waste into valuable and utilize the corn and other crop straws with high efficiency and low cost becomes a research and development hotspot of countries in the world in the field of biomass resource utilization. However, the yield of the corn straws is too large, and the yield regions are dispersed and limited by conditions such as transportation, so that the corn straws cannot be utilized on a large scale. Therefore, "straw burning" becomes the conventional treatment mode in rural areas. At present, "straw burning" becomes one of the pollution problems which troubles the national atmospheric environment in parallel with coal-fired flue gas.
Chinese patent document CN109266692A (application No. 201811195826.2) discloses a biogas production method by pretreating corn straws with biogas slurry, comprising the following steps: firstly, air-drying, crushing and sieving the corn straws, then preparing a pretreatment biogas slurry and an inoculation biogas slurry, then pretreating the corn straws through the pretreatment biogas slurry, and finally carrying out anaerobic digestion on the pretreated corn straws and the inoculation biogas slurry. The invention also provides a condition optimization method for the biogas production method, namely, the optimal conditions of the pretreatment process are obtained by taking the dosage of the pretreated biogas slurry, the pretreatment temperature and the pretreatment time as single factors of condition optimization through response surface test design and results. The corn with high lignin and cellulose content is pretreated by taking the biogas slurry as an accelerant, so that the pretreated corn is easy to carry out anaerobic fermentation; meanwhile, extra equipment is not needed in the operation process, so that the cost is low; and the optimal conditions of pretreatment of 19.08% TS, 29.78 ℃ and 5.42 days are obtained by a response surface method, and the theoretical gas production rate is 4786.3 mL.
The technology adopts the conventional method for producing the methane by fermenting the methane tank, and the problems of low gas production speed, low decomposition rate of raw materials, low gas production rate and the like are caused because the concentration of the raw materials and the moisture content are higher in the fermentation process. However, if the concentration of the raw material is increased, the fermentation system is collapsed due to the problems of local acidification, overhigh temperature and the like of the fermentation system caused by the excessively high decomposition speed of the microorganisms, and the normal operation of the fermentation process cannot be realized.
Disclosure of Invention
The not enough to prior art, the utility model discloses a maize straw anaerobism dry fermentation natural pond liquid backward flow yield increase methane device sets up the liquid distributor through the top at the anaerobism dry fermentation jar, has realized the natural pond liquid backward flow with the even spraying of natural pond liquid in the top of fermentation material, has avoided the dry fermentation in-process, because material concentration height leads to the easy acidizing of fermentation system, local temperature scheduling problem too high, has prevented the condition of fermentation system collapse, has improved the gas yield of fermentation.
The utility model discloses a realize through following technical scheme:
a corn stalk anaerobism dry fermentation natural pond liquid backward flow methane production increasing device includes:
the anaerobic dry fermentation tank is a closed fermentation tank, the upper part of the tank body is provided with a feed hole and a liquid inlet hole, the top end of the tank body is provided with an air outlet hole, and the bottom of the tank body is provided with a biogas slurry outlet;
the biogas slurry storage tank is a closed liquid storage tank and is provided with a storage tank liquid inlet and a storage tank liquid outlet, the storage tank liquid inlet is communicated with the biogas slurry outlet of the anaerobic dry fermentation tank through a pipeline, and the storage tank liquid outlet of the biogas slurry storage tank is communicated with a liquid inlet hole of the anaerobic dry fermentation tank through a pipeline;
the biogas slurry reflux pump is arranged in the biogas slurry storage tank and communicated with the pipeline, and two ends of the biogas slurry reflux pump are respectively communicated with the liquid outlet of the storage tank and the lower end of the pipeline of the liquid inlet hole of the anaerobic dry fermentation tank;
the liquid distributor consists of a main pipe and a plurality of branch pipes, wherein one end of the main pipe is connected with a liquid inlet hole of the anaerobic dry fermentation tank, the other end of the main pipe is sealed, two sides of the main pipe are vertically communicated with one ends of the branch pipes, the other ends of the branch pipes are sealed, the branch pipes are parallel to each other, and holes are formed in the branch pipes.
According to the invention, the bottom of the anaerobic dry fermentation tank is preferably V-shaped in section, and the biogas slurry outlet is arranged at the lowest end of the bottom of the anaerobic dry fermentation tank.
According to the invention, a filter screen is preferably arranged at the water inlet of the biogas slurry reflux pump.
According to the invention, the length of the branch pipes from one end of the liquid inlet of the anaerobic dry fermentation tank to the other end of the anaerobic dry fermentation tank increases gradually and then decreases gradually, and the branch pipes are symmetrical with the middle of the anaerobic dry fermentation tank.
According to the invention, the angle of the holes arranged on the branch pipe of the liquid distributor forms an included angle of 45 degrees with the vertical direction.
According to the invention, the apertures of the holes arranged on the branch pipes of the liquid distributor are sequentially increased along with the increase of the distance from the main pipe, the hole spacing is 50-70 cm, and the aperture is 2-5 mm.
According to the invention, the volume ratio of the anaerobic dry fermentation tank to the biogas slurry storage tank is (80-100): 1.
The utility model discloses a beneficial effect is:
1. the utility model discloses a corn stalk dry fermentation method preparation marsh gas through natural pond liquid backward flow, even spraying in the top of fermentation material, has avoided the dry fermentation in-process, because material concentration height leads to easy acidizing of fermentation system, local high temperature scheduling problem, has prevented the condition of fermentation system collapse.
2. The invention adopts a biogas slurry reflux mode to promote fermentation and gas production, reduces the biogas slurry production amount, avoids secondary pollution, and has the gas production rate of the corn straw dry fermentation TS (please confirm the data in the specification) reaching 400L/kgTS, which is obviously higher than the gas production rate of the conventional fermentation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a methane production increasing device by biogas slurry reflux through anaerobic dry fermentation of corn stalks;
FIG. 2 is a schematic structural view of a liquid distributor;
FIG. 3 is a cross-sectional view of the manifold.
In the figure: 1. anaerobic dry fermentation tank, 2, venthole, 3, feed port, 4, feed liquor hole, 5, biogas slurry outlet, 6, biogas slurry storage tank, 7, pipeline, 8, biogas slurry reflux pump, 9, liquid distributor, 10, main pipe, 11, branch pipe, 12, hole.
Detailed Description
The following explains the methane production increasing device by biogas liquid reflux in anaerobic dry fermentation of corn stalks with reference to the accompanying drawings.
The following is an embodiment of the present invention: a corn stalk anaerobism dry fermentation natural pond liquid backward flow methane production increasing device includes:
the anaerobic dry fermentation tank 1 is a closed fermentation tank, the upper part of the tank body is provided with a feed hole 3 and a liquid inlet hole 4, the top end of the tank body is provided with an air outlet hole 2, and the bottom of the tank body is provided with a biogas slurry outlet 5;
the biogas slurry storage tank 6 is a closed liquid storage tank and is provided with a storage tank liquid inlet and a storage tank liquid outlet, the storage tank liquid inlet is communicated with a biogas slurry outlet 5 of the anaerobic dry fermentation tank 1 through a pipeline 7, and the storage tank liquid outlet of the biogas slurry storage tank 6 is communicated with a liquid inlet hole 4 of the anaerobic dry fermentation tank 1 through the pipeline 7;
the biogas slurry reflux pump 8 is arranged in the biogas slurry storage tank 6 and is communicated with the pipeline 7, and two ends of the biogas slurry reflux pump 8 are respectively communicated with the liquid outlet of the storage tank and the lower end of the pipeline 7 of the liquid inlet hole 4 of the anaerobic dry fermentation tank 1;
a liquid distributor 9, which is composed of a main pipe 10 and a plurality of branch pipes 11, wherein one end of the main pipe 10 is connected with a liquid inlet hole 4 of an anaerobic dry fermentation tank 1, the other end of the main pipe 10 is closed, two sides of the main pipe 10 are vertically communicated with one end of the branch pipes 11, the other ends of the branch pipes 11 are closed, the branch pipes 11 are parallel to each other, holes 12 are arranged on the branch pipes 11, by the technical scheme, the corn straws can be crushed and then added into the anaerobic dry fermentation tank 1 for anaerobic fermentation for 2 months to prepare a primary fermentation raw material, biogas residues with equal mass are added into the primary fermentation raw material of the anaerobic dry fermentation tank 1 through a feed hole 3, a fermentation microbial inoculum with 4 percent of the mass of the primary fermentation raw material is added, anaerobic dry fermentation is carried out at the temperature of 36 ℃, the pH value of 8.0, biogas slurry flowing out in a fermentation system is sprayed and reflows from the top end of the fermentation raw material, and the problem, Local over-temperature and the like.
According to the invention, the bottom of the anaerobic dry fermentation tank 1 is preferably V-shaped in section, and the biogas slurry outlet 5 is arranged at the lowest end of the bottom of the anaerobic dry fermentation tank 1.
According to the invention, a filter screen is preferably arranged at the water inlet of the biogas slurry reflux pump 8. By arranging the filter screen at the water inlet, the biogas residues are prevented from blocking the holes of the liquid distributor 9, the fermentation system is prevented from collapsing,
according to the present invention, the length of the branch pipe 11 increases from one end of the liquid inlet of the anaerobic dry fermentation tank 1 to the other end and then decreases, and is symmetrical with the middle of the anaerobic dry fermentation tank 1.
According to the invention, the angle of the holes 12 arranged on the branch pipe 11 of the liquid distributor 9 is 45 degrees to the vertical direction.
According to the invention, the apertures of the holes 12 arranged on the branch pipes 11 of the liquid distributor 9 are sequentially increased along with the increase of the distance from the main pipe 10, the hole spacing is 50-70 cm, and the aperture is 2-5 mm.
According to the invention, the volume ratio of the anaerobic dry fermentation tank 1 to the biogas slurry storage tank 6 is (80-100): 1. Through the structural design of the main pipe 10 and the branch pipes 11 of the liquid distributor 9, the whole liquid distributor 9 can be fully distributed above the anaerobic dry fermentation tank 1, so that the biogas slurry can spray all the primary fermentation raw materials; the difference in the aperture in the branch pipes 11 of the distributor 9 has a certain effect on the technical result, which may be due to: the large outer aperture can lead to the fermentation heap outside natural pond liquid backward flow fast, is favorable to outside raw materials heat to be sparse, and inside temperature is higher to restrain the growth of thallus, thereby prevented the system collapse, after the fermentation heap outside preceding fermentation raw materials fully ferment, cool down gradually, thereby inside radiating rate accelerates, and the fermentation process removes to the fermentation heap center gradually, and is up to the complete consumption of preceding fermentation raw materials. Because the fermentation speed is continuous and stable, the local over-acidification cannot be generated to influence the gas production,
Referring to FIGS. 1-3: the specific steps of using the device are as follows:
(1) crushing the corn straws into particles with the particle size of 1.5cm by a crusher to prepare straw scraps;
(2) adding water into the straw scraps prepared in the step (1) to adjust the water content to 70%, placing the straw scraps into an anaerobic dry fermentation tank 1, and performing anaerobic fermentation for 2 months to obtain a pre-fermentation raw material;
(3) adding biogas residues with equal mass into the primary fermentation raw material in the step (2) in the anaerobic dry fermentation tank 1 through the feed hole 3, adding a fermentation microbial inoculum with 4% of the mass of the primary fermentation raw material, performing anaerobic dry fermentation at the temperature of 36 ℃ and the pH value of 8.0, and spraying and refluxing biogas slurry flowing out of a fermentation system from the top end of the fermentation raw material.
For those skilled in the art, based on the teachings of the present invention, changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.
Claims (7)
1. The utility model provides a maize straw anaerobism dry fermentation natural pond liquid backward flow methane production increasing device which characterized in that: the method comprises the following steps:
the anaerobic dry fermentation tank is a closed fermentation tank, the upper part of the tank body is provided with a feed hole and a liquid inlet hole, the top end of the tank body is provided with an air outlet hole, and the bottom of the tank body is provided with a biogas slurry outlet;
the biogas slurry storage tank is a closed liquid storage tank and is provided with a storage tank liquid inlet and a storage tank liquid outlet, the storage tank liquid inlet is communicated with the biogas slurry outlet of the anaerobic dry fermentation tank through a pipeline, and the storage tank liquid outlet of the biogas slurry storage tank is communicated with a liquid inlet hole of the anaerobic dry fermentation tank through a pipeline;
the biogas slurry reflux pump is arranged in the biogas slurry storage tank and communicated with the pipeline, and two ends of the biogas slurry reflux pump are respectively communicated with the liquid outlet of the storage tank and the lower end of the pipeline of the liquid inlet hole of the anaerobic dry fermentation tank;
the liquid distributor consists of a main pipe and a plurality of branch pipes, wherein one end of the main pipe is connected with a liquid inlet hole of the anaerobic dry fermentation tank, the other end of the main pipe is sealed, two sides of the main pipe are vertically communicated with one ends of the branch pipes, the other ends of the branch pipes are sealed, the branch pipes are parallel to each other, and holes are formed in the branch pipes.
2. The device for increasing the methane yield by the backflow of the biogas slurry in the anaerobic dry fermentation of the corn straws according to claim 1, which is characterized in that: the profile of the bottom of the anaerobic dry fermentation tank is V-shaped, and the biogas slurry outlet is arranged at the lowest end of the bottom of the anaerobic dry fermentation tank.
3. The device for increasing the methane yield by the backflow of the biogas slurry in the anaerobic dry fermentation of the corn straws according to claim 1, which is characterized in that: and a filter screen is arranged at the water inlet of the biogas slurry reflux pump.
4. The device for increasing the methane yield by biogas slurry reflux of anaerobic dry fermentation of corn stalks according to claim 3, characterized in that: the length of the branch pipes from one end of the liquid inlet of the anaerobic dry fermentation tank to the other end of the anaerobic dry fermentation tank increases gradually and then decreases gradually, and the branch pipes are symmetrical to the middle of the anaerobic dry fermentation tank.
5. The device for increasing the methane yield by biogas slurry reflux of anaerobic dry fermentation of corn stalks according to claim 4, characterized in that: the included angle between the angle of the hole arranged on the branch pipe of the liquid distributor and the vertical direction is 45 degrees.
6. The device for increasing the methane yield by biogas slurry reflux of anaerobic dry fermentation of corn stalks according to claim 5, characterized in that: the aperture of the holes formed in the branch pipe of the liquid distributor is sequentially increased along with the increase of the distance from the main pipe, the hole distance is 50-70 cm, and the aperture is 2-5 mm.
7. The device for increasing the yield of methane by refluxing the biogas slurry in the anaerobic dry fermentation of corn stalks according to any one of claims 1 to 6, characterized in that: the volume ratio of the anaerobic dry fermentation tank to the biogas slurry storage tank is (80-100): 1.
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| CN201921074160.5U CN210237608U (en) | 2019-07-10 | 2019-07-10 | Corn stalk anaerobic dry fermentation biogas slurry reflux methane production increasing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184228A (en) * | 2019-07-10 | 2019-08-30 | 山东省农业科学院农业资源与环境研究所 | A kind of method of corn stover anaerobic dry fermentation microbial inoculum and biogas slurry reflux volume increase methane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184228A (en) * | 2019-07-10 | 2019-08-30 | 山东省农业科学院农业资源与环境研究所 | A kind of method of corn stover anaerobic dry fermentation microbial inoculum and biogas slurry reflux volume increase methane |
| CN110184228B (en) * | 2019-07-10 | 2024-04-02 | 山东省农业科学院农业资源与环境研究所 | Corn straw anaerobic dry fermentation microbial inoculum and biogas slurry reflux methane production method |
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