A two-phase anaerobic process and equipment for extracting lignocellulose and producing methane from straw

Abstract

The invention discloses a two-phase anaerobic technology and equipment for extracting lignocellulose from straw and generating methane. After rubbing breakage is performed on the straw, pyrohydrolysis is performed, then enhanced hydrolytic acidification is performed, after acidification mud generated through enhanced hydrolytic acidification is regulated by being mixed with part of acidizing liquid, anaerobic fermentation is performed, and after being regulated by biogas liquid generated through anaerobic fermentation, another part of the acidizing liquid is mixed with the straw processed through pyrohydrolysis to for continuous enhanced hydrolytic acidification; anaerobic fermentation is performed on the retained acidizing liquid; mechanical and hydraulic composite membrane removing is performed on floaters undissolved through enhanced hydrolytic acidification to form the lignocellulose, and then cleaning, disinfecting, drying, packaging and warehousing are performed; biogas generated through enhanced hydrolytic acidification and anaerobic fermentation is output to be utilized; biogas residues generated through anaerobic fermentation are used as organic fertilizer, and the redundant biogas liquid is used as the organic fertilizer or discharged after being processed through advanced treatment to reach the standard.

Description

technical field [0001] The invention belongs to the fields of new energy, environmental protection and circular economy, and specifically relates to a two-phase anaerobic process and equipment for extracting lignocellulose and producing methane through enhanced hydrolysis pretreatment of straw biogas. Background technique [0002] Straw usually refers to the remaining part of crops such as wheat, rice, and corn after the seeds are harvested. my country is a large agricultural country and is also a major producer of straw. Statistics show that in 2010, my country's theoretical straw resources amounted to 840 million tons, the amount of resources that could be collected was about 700 million tons, and the amount of resources that could be comprehensively utilized was about 500 million tons. However, due to the lack of effective treatment methods, about 247 million tons of straw Being directly incinerated will not only pollute the surrounding air environment, endanger human heal...

AI Technical Summary

Problems solved by technology

[0003] In 2013, the Chinese Academy of Agricultural Sciences and Beijing University of Chemical Technology jointly carried out an evaluation study on the economic benefits of straw biogas centralized gas supply projects. The empirical analysis results show that under the existing management conditions, most straw biogas centralized gas supply projects can only save capital or small profit run

This method needs to use extra equipment, increases investment, and the operation method is more complicated;

[0008] 3) Automatic shell breaking biogas digester: if the baffle is used to prevent the fermentation raw materials from floating up to form a scum layer, etc., the disadvantage is that the tank body is more complicated, which increases investment, and later maintenance is difficult, and it is only suitable for new tanks;

The disadvantage is that due to the accumulation of a large amount of non-degradable straw, it is not easy to operate, prone to failure, and complex maintenance and management

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