Two-phase anaerobic fermentation system applying gas-liquid combined stirring

Abstract

The invention discloses a two-phase anaerobic fermentation system applying gas-liquid combined stirring. A hydrolytic acidification tank 1, a gas production tank 2, a gas collection tank 3, a desulfurization drying device 4, a purifying device 5, an air pump 6, and a circulating pump 7 form two circulation of pneumatic stirring and hydraulic stirring. The two kinds of stirring modes including pneumatic stirring and hydraulic stirring are utilized to correspond to two stages of the two-phase anaerobic fermentation system respectively; meanwhile, in the pneumatic stirring circulation, CO2 which is refined and extracted from marsh gas is regarded as stirring power, thus the yield of methane is sharply increased, the organic waste is converted into energy substance methane, the greenhouse gas emission amount is reduced at the same time, and thus the two-phase anaerobic fermentation system which is simple in structure and convenient to operate is obtained.

Description

technical field [0001] The invention relates to a two-phase anaerobic fermentation system, in particular to a two-phase anaerobic fermentation system using gas-liquid combined stirring, and belongs to the technical field of renewable energy. Background technique [0002] With the global warming and the increasing shortage of fossil energy, anaerobic fermentation technology has been paid more and more attention worldwide. Anaerobic fermentation technology has the characteristics of low energy consumption, no pollution and the ability to produce renewable energy biogas. At present, many experts and scholars at home and abroad have conducted research on anaerobic fermentation technology. Anaerobic fermentation technology mainly includes single-phase anaerobic fermentation technology and two-phase anaerobic fermentation technology. Compared with single-phase anaerobic fermentation technology, two-phase anaerobic fermentation technology has the advantages of strong impact load ...

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Problems solved by technology

[0003] However, there are still a series of problems in the current two-phase anaerobic fermentation technology. One is that the hydrolysis and acidification process in the hydrolysis and acidification tank in the traditional process will generate a large amount of hydrogen, but the amount of degraded hydrogen is very small, making the hydrolysis and acidification tank The partial pressure of hydrogen gradually increases, which inhibits the further anaerobic oxidation of propionic acid, directly leads to the accumulation of propionic acid and reduces the stability of the hydrolysis acidification tank, thus affecting the stable gas production; the second is the hydrolysis acidification tank and the gas production tank. Uneven material distribution is easy to form accumulation and top crust, which reduces the gas production, so it is necessary to add a suitable stirring method

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