An anaerobic fermentation device and method for preparing biogas

Abstract

The invention provides an anaerobic fermentation device for preparing marsh gas. The anaerobic fermentation device comprises a tank body, a marsh dreg reflowing pipe and a feeding round pipe, wherein a separation plate is arranged in the tank body; the separation plate is convex downward to form a spherical crown structure and the tank body is divided into a tank body upper part and a tank body lower part; a feeding pipe and a dreg discharging pipe are arranged at the tank body lower part respectively; an overflowing discharging pipe is arranged at the tank body upper part; the marsh dreg reflowing pipe is arranged at the bottom of the separation plate; the tank body upper part is communicated with the tank body lower part through the marsh dreg reflowing pipe; the feeding round pipe penetrates through the separation plate along the vertical direction and is arranged in the tank body; the top of the feeding round pipe is connected with the top of the tank body; the bottom end of the feeding round pipe is connected with the bottom of the tank body; the top of the feeding round pipe is of an inverted tapered screen mesh structure; one part, located at the lower part of the tank body, of the feeding round pipe is of a cylindrical screen mesh structure; the screen hole size of the inverted tapered screen mesh structure is less than the screen hole size of the cylindrical screen mesh structure. The anaerobic fermentation device provided by the invention does not need stirring and interference of mechanical equipment and the fermentation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of anaerobic fermentation, and more specifically relates to an anaerobic fermentation device and method for preparing biogas. Background technique [0002] Anaerobic fermentation of biogas refers to the catabolism of organic substances, such as human, livestock and poultry manure, straw, weeds, etc., under certain moisture, temperature and anaerobic conditions, through the catabolism of various microorganisms with a large number and different functions. , a complex biochemical process that eventually forms mixed gases such as methane and carbon dioxide. [0003] At present, straw biomass is widely used in industry as the main raw material for anaerobic fermentation for biogas production. However, straw-like biomass is light in density and flake-like, so it is easy to float, and it is difficult to mix naturally and evenly with fermentation liquid and fermentation sludge, which makes anaerobic fermentation mo...

AI Technical Summary

Problems solved by technology

Although such an improvement can make the anaerobic fermentation device operate normally, it is difficult to fully mix the raw materials with the fermentation liquid and fermentation sludge due to the stirring and interference of the mechanical equipment, and the use of the above-mentioned mechanical equipment will consume a large amount of electricity and increase the construction investment. and later operation and maintenance costs

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