Steam-exploded wet-stored corn straw two-phase anaerobic fermentation method

Abstract

The present invention relates to the technical field of new energy, and relates to a wet-stored corn straw two-phase anaerobic fermentation method using instantaneous ejection type steam explosion as a pretreatment way. According to the method, aiming at the character of rich intracellular water contained in wet-stored corn straws, the intracellular water in the wet-stored corn straws is rapidly vaporized, and expanded by instantaneous ejection type steam explosion technology by use of high-pressure steam heating and short time explosion effect to achieve material microstructure crushing and macroscopic slurrying purposes. Meanwhile, formic acid, acetic acid, propionic acid and butyric acid are produced by thermochemical reaction during steam explosion process, so that the exploded straws are in the acidic state of PH of 4.1-4.4. With the condition, the steam exploded and slurried straws are pumped into an acidified reactor, and can be naturally rapidly acidified and hydrolyzed under conditions without the addition of chemicals. Finally, according to the fermentation load capacity of a methanation reactor, hydrolysate is uniformly and continuously supplied by the acidified reactor, and a smooth anaerobic fermentation process can be achieved.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a two-phase anaerobic fermentation method for wet storage of corn stalks by using instantaneous catapult steam explosion as a pretreatment method. Background technique [0002] The annual reserves of corn stalks in my country reach 261 million tons, accounting for 39% of the total straw resources in my country. The proportion of these straws as feed, fertilizer and industrial raw materials is still very low. Straw returning and incineration have become the most important treatment methods in essence. Due to the high carbon-nitrogen ratio of corn stalks, slow degradation and maturity, no isolation of diseases and insect pests, and excessive quantity, straw returning to the field has affected the planting of the next season. Although straw incineration solves the above problems, it brings serious atmospheric particulate matter pollution, which runs counter to the construction of...

AI Technical Summary

Problems solved by technology

Due to the rapid acidification of straw, in the case of full-mix fermentation, it is easy to cause the impact of feeding, causing acidification and inhibiting fermentation, so it is difficult to increase the fermentation concentration

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