Methane fermentation device for straw

Abstract

The invention belongs to a methane fermentation device for a straw in the field of energy sources. The methane fermentation device consists of a fermenting tank (11) and a liquid storage unit (1), wherein a feeding pipe (10) and a methane pipe opening (9) are arranged on the top of the tank body; a slag drainage port (8) is formed at the bottom of the tank body; a gravity material pushing device (6) is arranged in the feeding pipe (10); a material storage unit is arranged at the upper part of the feeding pipe (10); the material storage unit, the gravity material pushing device (6) and a control element form an automatic charging unit; a circular cone shaped slag retaining annular plate (14) is arranged on the upper part inside the tank body; the upper end of the slag retaining annular plate (14) is connected with an outlet of the feeding pipe; the lower end of the slag retaining annular plate (14) is connected with the inner wall of the tank body; a liquid-slag separation plate (16) is arranged on the lower part inside the tank body; the surrounding of the liquid-slag separation plate is connected with the inner wall of the tank body; and a liquid drainage pipe (3) is arranged at the bottom of the fermenting tank (11). The methane fermentation device for the straw provided by the invention can directly digest straws with large particles and successfully charge and discharge the materials, and is low in energy consumption and low in input-output ratio.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to a straw biogas fermentation device. Background technique [0002] Crop stalks come from a wide range of sources, and the amount of resources is large. A large amount of stalks cannot be effectively treated, which brings a series of environmental problems. Straw biogas utilization can effectively solve this problem, and at the same time produce high-quality bioenergy—biogas, which has become one of the important means of straw resource utilization. The raw materials of existing straw continuous fermentation devices generally need to be pretreated such as crushing, because of their poor fluidity, mechanical stirring is usually required to achieve mass and heat transfer. The specific gravity of the straw is light, and it is easy to float up to form a hard shell after entering the fermentation device, which hinders the accumulation of biogas generated in the pond and reduces the ut...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of low material concentration, low utilization rate of raw materials, relying on mechanical equipment, large investment in equipment, high energy consumption, and low efficiency of anaerobic digestion and gas production in the straw biogas continuous fermentation device in the prior art, and provide a A straw biogas fermentation device that can directly digest large particles of straw, has low energy consumption, smooth feeding and discharging, and low input-output ratio

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