Device and method for producing methane in biological biogas fermentation tank

Abstract

The invention discloses a device and a method for producing methane in biological biogas fermentation tank. The device comprises a fermentation tank body for fermenting organic wastes, wherein a feeding device is arranged above the fermentation tank body, a gas storage device is arranged above a side of the fermentation tank body, a discharging device is arranged at a bottom of the fermentation tank body, and a stirrer for stirring the organic wastes is arranged inside the fermentation tank body; the stirrer comprises a motor arranged right above the fermentation tank body, a stirring rod electrically connected with a motor and arranged inside the fermentation tank body, and a stirring impeller; wherein the stirring rod, the stirring impeller and the fermentation tank body form a voltage generating circuit through a direct-current power supply, namely, an anode of the direct-current power supply is connected with the stirring rod and the stirring impeller, a cathode of the direct-current power supply is connected with a stainless steel net surrounding an inner wall of the fermentation tank body, and carbon dioxide generated by fermentation of organic wastes is electrolyzed into methane. The device can be used to electrolyze carbon dioxide into methane, thereby improving purity of methane gas in the biogas.

Description

technical field [0001] The invention relates to the field of biogas fermentation tanks, in particular to a methane generation device and method for biogas fermentation tanks. Background technique [0002] At present, biogas is mainly produced from organic waste such as kitchen waste and straw. The production and development of biogas, as a rich energy source, has been widely used in people's life and industrial and agricultural production. [0003] With the continuous development and utilization of biogas, the requirements for biogas production technology are getting higher and higher; the existing biogas fermentation method is mainly to feed the organic waste after preliminary treatment into the biogas fermentation tank or fermentation tank at one time, and add methane Bacterial material, relying on the natural environment temperature to ferment to produce methane gas, the method of batch fermentation to produce biogas after fermenting to produce gas and then refueling. ...

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Problems solved by technology

[0004] In the above process, a large amount of carbon dioxide gas will be produced during the biogas fermentation process, accounting for about 30% of the total gas, and the purity of methane will also be affected, only 50-60%, and low-purity methane gas will affect the combustion. Efficiency, cannot be applied to daily production and life

[0005] Therefore, in order to improve the purity of methane in biogas, the method of carbon dioxide adsorption is generally used for purification, but this method consumes a lot of energy and also brings a lot of waste of carbon atoms; at the same time, in production, due to methane Fermentation requires a higher temperature. In winter in the north, because the outdoor temperature cannot meet the fermentation requirements, biogas fermentation is rarely used in the north. Even if there is a small amount of application, most of them will stop production after autumn, while biogas fermentation mostly uses Agricultural production of remaining straw, and the production of straw is mostly produced after the autumn harvest, which greatly affects the process of solid waste recycling; and in production, most of them use extra heat to provide extra heat to the fermentation tank to maintain Fermentation, which will also cause a large amount of additional energy consumption, thereby increasing the cost of biogas fermentation, and for these reasons, biogas fermentation cannot be popularized in daily life

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