Pretreatment process of biogas fermentation system

Abstract

The present invention discloses a pretreatment process of a biogas fermentation system. The process can pretreat lignocellulosic feedstock with high lignin content for biogas fermentation and is as follows: feeding recovered lignocellulosic feedstock to an unpacking crude powder machine for cutting and rough grinding; then cut and crushed lignocellulosic feedstock to the a plug flow decomposition generation tank provided with a central plug flow agitator for preliminary infiltration decomposition, wherein the plug flow decomposition generation tank is provided with reflux biogas, and the temperature in the plug flow decomposition generation tank can be controlled by waste heat form thermoelectricity combined production or other heat sources; slowly advancing the lignocellulosic feedstock through the central plug flow agitator, outputting the feedstock from the end of the plug flow decomposition generation tank, and sending the feedstock into a double helix of thermal decomposition kneading machine for thermal decomposition and knead operation to each a pasty state; and pumping the pasty lignocellulosic feedstock by a screw pump into an anaerobic reactor.

Description

technical field [0001] The invention relates to the technical field of a biogas fermentation system, in particular to a pretreatment process of a biogas fermentation system. Background technique [0002] While grain production continues to increase, the processing of wood fiber materials such as crops after harvest has become a particularly prominent problem. More than 30% of crop fiber materials are left idle every year. Although many supporting measures have been introduced in various places, it still cannot solve a large number of The status quo of crop fiber materials being idle, discarded, and burned has resulted in waste of resources and serious pollution to the environment. To solve the problem of idle fiber materials, it is necessary to find ways to use fiber materials extensively. Biogas fermentation production is the solution One of the best ways to deal with fiber materials is gradually becoming a key link in the development of eco-agricultural circular economy. ...

AI Technical Summary

Problems solved by technology

[0003] The existing biogas fermentation system has the problems of relatively low gas production efficiency and long fermentation cycle. How to process lignocellulosic raw materials into raw materials with high gas production efficiency, short fermentation cycle, and convenient feeding and discharging through simple pretreatment technology is an important issue. The key to restricting the direct and efficient biogasification of lignocellulosic raw materials

The existing pretreatment process is mainly based on alkali treatment, but the alkalinity of the material increases after alkali treatment, which has an inhibitory effect on the activity of anaerobic microorganisms, thus affecting the anaerobic fermentation rate of lignocellulosic raw materials

Moreover, alkali treatment is easy to cause pollution to the environment, which is not conducive to environmental protection.

[0004] In addition, in the existing pretreatment process, lignocellulosic raw materials are generally crushed into short fibers. During the anaerobic fermentation process, the short fibers float on the surface of the liquid driven by biogas bubbles, causing floating crusting problems, which hinder the accumulation of biogas , low raw material utilization

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