Tail vegetable utilization technology applicable to large biogas project

Abstract

The invention discloses a tail vegetable utilization technology applicable to a large biogas project and relates to the technical field of energy sources. The technology comprises the following operation steps of: crushing a tail vegetable raw material from a vegetable processing enterprise into a powdered or pasty material with a large hammer crusher, conveying the crushed tail vegetable raw material into a screw press for extrusion to sufficiently separate vegetable slag from vegetable juice, further damaging cellulose of a vegetable, allowing the tail vegetable juice obtained by pressing toenter a homogenization tank of a biogas slurry tank by gravity, mixing the tail vegetable juice with refluent biogas slurry and excrements of livestock from an anaerobic jar, adjusting a carbon-nitrogen ratio of a fermentation raw material, conveying the fermentation raw material into an anaerobic fermentator via a screw pump to produce biogas, and adjusting a potential of hydrogen. The tail vegetable is used for large biogas production can be treated quickly and extensively; the pollution of the tail vegetable to an environment is reduced; the treated tail vegetable does not generate secondary pollution; and the serious problem of acidification of the tail vegetable in a biogas production process is further solved at the same time.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a tail vegetable utilization process suitable for large biogas. Background technique [0002] Large-scale biogas means that the daily biogas production capacity reaches 300m 3 Large-scale biogas production projects in my country have made great progress in recent years, and the designed daily gas production of many large-scale biogas projects has reached 20,000m 3 / d or more, due to the different sources and properties of fermentation raw materials, there are also large gaps in raw material costs and gas production rates. How to reduce the cost of fermentation raw materials and increase the gas production of biogas anaerobic fermentation tanks is the main direction of large-scale biogas project research. [0003] At present, the research materials of biogas fermentation raw materials are mainly aimed at small rural biogas, and the main research directions are the carbon-nitroge...

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Problems solved by technology

[0003] At present, the research materials of biogas fermentation raw materials are mainly aimed at small rural biogas, and the main research directions are the carbon-nitrogen ratio of raw materials, temperature, and the influence of different methane strains on gas production. There are few studies on the ratio of raw materials for industrialized large-scale biogas

[0004] With the development of rural land circulation and intensive agriculture, the planting structure of each planting area is different. In the production and storage of vegetable planting areas, there are often a large number of end vegetables that cannot be well utilized, hundreds of tons or even thousands of tons per day. The tail vegetables are dumped indiscriminately, causing serious pollution to the local environment

Although there are some studies on the technology of biogas fermentation of the leftovers in the process of vegetable planting and processing, that is, tail vegetables, but due to the high water content of tail vegetables, the easy acidification of anaerobic fermentation raw materials, and the CO in biogas 2 Due to high ingredients, the application is not ideal

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