Method for producing clean biogas by pure straw two-phase anaerobic fermentation

Abstract

The invention discloses a method for producing clean biogas by pure straw two-phase anaerobic fermentation. The method comprises the following steps: conducting a steam explosion pretreatment processon biomass straw, mixing the biomass after steam explosion pretreatment and water to form an acidification reaction liquid, introducing the acidification reaction liquid into an acidification reactor,generating an organic acid in the acidification reactor, and then extracting the organic acid into a digestion reactor for anaerobic digestion to produce biogas. The design is novel, the steam explosion pretreatment technology is used to pretreat the biomass straw, anaerobic bacteria suitable for pure straw is selected, and finally the clean biogas with high methane content and single compositionis obtained. Therefore, the method is a very good innovative scheme with broad market prospects.

Description

technical field [0001] The invention relates to a method for preparing biogas energy, in particular to a method for producing clean biogas by two-phase anaerobic fermentation of pure straw with convenient operation. Background technique [0002] As one of the largest agricultural countries in the world, China produced about 827 million tons of crop straw and 3.6 billion tons of livestock and poultry manure in 2010. If these agricultural wastes are anaerobically fermented Transformation can produce 340.8 billion cubic meters of biogas, which is enough to make up for the shortage of biogas for rural households across the country. At present, the existing technologies at home and abroad mainly use the crushed straw as part of the raw material, mix and ferment with livestock and poultry manure, and produce biogas through a relatively long fermentation time (usually 30-90 days to complete the fermentation). Chinese patent CN 104878045B discloses a method for two-phase mixed anae...

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Problems solved by technology

[0003] 1). Preprocessing consumes a lot of energy; 2). The system startup cycle is long;

[0004] 3). The stability of the system is poor; 4). The fermentation time is long;

[0005] 5). The single-phase fermentation process is simple and the efficiency is low; the two-phase fermentation efficiency is high, but the production process is complicated;

[0006] 6). The composition of biogas is complex, and it needs to be purified before combustion and utilization, which increases the cost of use and affects the economy of the device

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