Technology for preparing methane through steam explosion sugarcane leaves dry-method anaerobic fermentation

Abstract

The invention relates to a technology for preparing methane through steam explosion sugarcane leaves dry-method anaerobic fermentation, and belongs to the field of agricultural solid waste utilization for energy. The technology comprises the steps as follows: firstly, sugarcane leaves are positioned in a sealed steam explosion device, after introducing saturated steam, the steam explosion pressure is controlled to reduce instantly for obtaining steam explosion sugarcane leaves materials; secondly, a certain amount of pig manure and methane fermentation accelerators, as well as 30% to 40% of inoculum are put into the sugarcane leaves subjected to the steam explosion in sequence as materials of which the C / N is adjusted to 25 to 1 through ammonium bicarbonate and the dry matter density of the materials is adjusted to 22% to 25% through adding water, and then be stirred uniformly and canned for intermediate temperature anaerobic fermentation, and methane is produced. Through adopting the steam explosion method for pre-processing the sugarcane leaves, the internal structure of the sugarcane leaves are damaged effectively so as to generate the breakage and separation of cellulose, hemicellulose and lignin structure, promote the digestion utilization of the fermenting on microorganism of methane in dry-method anaerobic fermentation against the sugarcane leaves, and the fermenting time is shortened by about 15 days, the methane yield is increased by 20%, and besides, the method is simple in technology and low in cost.

Description

technical field [0001] The invention relates to a method for converting biological organic material raw materials into combustible gas, in particular to a process for preparing biogas by dry anaerobic fermentation of steam-exploded sugarcane leaves, which is a process for preparing biogas by dry fermentation of sugarcane leaves , belonging to the technical field of agricultural solid waste energy utilization. Background technique [0002] Sugarcane leaves are a large amount of agricultural straw resources in the tropical regions of my country. The annual waste of sugarcane leaves reaches 20 million tons. At present, most sugarcane leaves are burned on the spot, which not only causes serious air pollution, but also causes great safety hazards. Sugarcane leaves are rich in nutrients, and compared with corn stalks, the carbon content is 10 percent higher, and it is an excellent raw material for biogas production. Through dry anaerobic fermentation technology, discarded sugarc...

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Problems solved by technology

[0005] However, the cost of the enzymatic method is relatively high, and the treatment by the acid method and the alkali method causes environmental pollution. The present invention provides a process for producing biogas by steam-exploded sugarcane leaf dry anaerobic fermentation. The steam-explosion pretreatment can effectively destroy the inside of the sugarcane leaf structure, which breaks and separates the structure of cellulose, hemicellulose and lignin, promotes the digestion and utilization of sugarcane leaves by biogas fermentation microorganisms during dry anaerobic fermentation, and can obtain a faster start-up rate and higher biogas production