Home device and method for producing methane by dry-type fermentation of stalks

Abstract

The invention relates to a device for producing biogas by straw dry type fermentation and a method, belongs to the agriculture environmental protection and biomass energy source utilization field. The straw is chopped. Nitrogen fertilizers are added. C / N is adjusted. The mixture is arranged in a column shaped biogas digester built underground after the mixture is composted. Anaerobic fermentation outcomes are inoculated and sealed with red-sludge plastic. The biogas is produced in the process of anaerobic fermentation. When the biogas production is lowered, the straw is processed eluviation by biogas liquid which is pumped by manual pumping device. When the biogas production is obviously reduced, the new materials should be changed. The straw dry typed anaerobic biogas can be realized. The technical requirements that the straw is substituted the animal manure as the main raw materials are achieved. The straw dry typed fermentation technology is used, which can reduce the difficulties in treating biogas liquid and biogas slag of the wet typed anaerobic fermentation biogas. At the same time, the volumetric biogas production of the biogas digester is improved, and the biogas digester building cost is lowered and the biogas digester occupied area is reduced. The designed biogas fluid backflow system solves the difficulty of the exchange of mass flows and substances in the straw dry typed fermentation.

Description

Technical field: [0001] The invention relates to a device and method for household straw dry fermentation to produce biogas, which is a straw energy utilization technology and belongs to the fields of agricultural environmental protection and biomass energy utilization. Background technique: [0002] The straw resources in rural areas of our country are very rich. At present, there are nearly 20 kinds of important crop straws, and the output is huge. It is estimated that my country produces 700 million tons of crop straws each year, of which 42% are returned to the field directly or through the belly, 30% are used as agricultural fuel, 8% are used for industrial or other purposes, and 20% of the remaining 120 million tons are not used. use]. These remaining crop stalks are abandoned in the fields and yards, which not only occupies a large amount of land, but also affects the rural environmental sanitation. Especially in the "three summers" and "three autumns" seasons every y...

AI Technical Summary

Problems solved by technology

[0011] Technical Problems The purpose of the present invention is to solve the difficulties in biogas slurry treatment in the water network area of ​​the household water pressure biogas digester straw wet method that is currently popularized and applied, and use straw as the main raw material after the fermentation of the hydraulic biogas digester is completed. , it is inconvenient to clean straw residues, and the existing hydraulic biogas digesters have no biogas slurry return system, so it is impossible to carry out biogas slurry return liquid and other difficulties. To provide a new type and method of household straw dry anaerobic biogas production

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