High-temperature biogas production device in agricultural waste straw mixed raw materials

Abstract

The invention discloses a device for preparing biogas from agricultural waste straw mixed raw materials at a medium-high temperature. The device comprises a double-cone fermentation tank and an automatic deslagging system, the double-cone fermentation tank and the automatic deslagging system comprise a fermentation tank body, the top of the fermentation tank body is provided with a tank top, the top of the tank top is connected to a gas storage tank, the gas storage tank is provided with a gas storage tank cover, the side wall of the gas storage tank is connected to a gas guide pipe, the conical tank top is provided with a peripheral feeding port, the conical tank top is provided with an overflow pipe and a backflow pipe, the lower end of the backflow pipe extends into a biogas slurry pool, and a heating circulating pipe is arranged in a biogas slurry heating chamber and is communicated with a boiler; inspection windows are arranged at the lower part of the fermentation tank and are matched with and connected to covers; and the bottom of the fermentation tank is provided with a slag discharging channel and a water discharging pipe which are communicated with the biogas slurry pool.The device has the advantages that the structure is compact, the design is reasonable, the straw biogas mixed raw material is subjected to stack retting in the fermentation tank by adopting a full-dry fermentation process, the stack retting temperature is as high as 60-70 DEG C, after the old biogas slurry returns, the straw mixed raw material can be subjected to medium-high temperature fermentation, the fermentation period is short, the gas production rate is high, and a large amount of crop straw can be consumed.

Description

technical field [0001] The invention relates to the technical fields of energy and environmental protection, in particular to a high-temperature biogas production device from agricultural waste and straw mixed raw materials. Background technique [0002] At present, vertical large-scale fermentation tanks that use crop straw as biogas raw material both at home and abroad have the problem of biogas raw material floating and crusting. The straw biogas raw material floating on the biogas slurry does not produce gas or produces a small amount of gas, and it will crust over time. It is thick and hard, and the biogas produced cannot come out, and the fermenter will be scrapped. For this reason, a stirring device is installed. Although the stirring device solves the crusting problem, it limits the increase of the dry matter content of the biogas raw material in turn, resulting in low production rate and large investment; the dry matter content of the straw biogas raw material in th...

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Problems solved by technology

[0005] As a biogas raw material, straw floats and crusts, and it is difficult to feed in and out, low gas production rate, large project investment, and high operating costs are common technical problems at home and abroad. At the same time, the mechanical stirring motor is directly installed on the tank roof, which makes sealing difficult and easy to leak air leak

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