Mechanical and pneumatic combined dry anaerobic fermentation system and fermentation method

Abstract

The invention discloses a mechanical and pneumatic combined dry anaerobic fermentation system. The system comprises a horizontal fermentation tank, a mechanical stirring assembly and a pneumatic stirring assembly, wherein the mechanical stirring assembly comprises a stirring shaft arranged in the axial direction of the horizontal fermentation tank and a plurality of blades arranged on the stirring shaft; the pneumatic stirring assembly comprises a first pneumatic pipe, a second pneumatic pipe and an air supply pipeline connected with the first pneumatic pipe and the second pneumatic pipe, and the first pneumatic pipe and the second pneumatic pipe are sequentially arranged in the axial direction of the horizontal fermentation tank. Through combination of the mechanical stirring assembly and the pneumatic stirring assembly, energy consumption of mechanical stirring is reduced, gas generated through fermentation is used for stirring, energy is saved, the first pneumatic pipe corresponds to the material acid production stage, the second pneumatic pipe corresponds to the material methane production stage, materials in the two stages are stirred in a differentiated mode, the stirring requirements of the materials in different stages are met, and efficient anaerobic fermentation of the fermented materials is facilitated.

Description

technical field [0001] The invention relates to the technical field of dry anaerobic fermentation, in particular to a dry anaerobic fermentation system and fermentation method combined with mechanical and pneumatic. Background technique [0002] Dry anaerobic fermentation is an organic biowaste technology with low requirements for raw material pretreatment, low energy consumption, simple system, and convenient management. application prospects. [0003] The current dry anaerobic fermentation usually adopts a horizontal fermenter, which is fed from one end and discharged from the other end. The dry anaerobic fermentation is usually divided into two stages in the horizontal fermenter. The first stage is the acid production stage, and the new stage The material enters the reaction tank, more stirring is conducive to the mixing of materials, so that the crust layer (upper layer), supernatant layer (middle layer) and sediment layer (bottom layer) of the straw fermentation produc...

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Problems solved by technology

[0003]The current dry anaerobic fermentation usually adopts a horizontal fermenter, which is fed from one end and discharged from the other end. Dry anaerobic fermentation is carried out in a horizontal fermenter It is usually divided into two stages. The first stage is the acid production stage. The new material enters the reaction tank, and more stirring is conducive to the mixing of materials, so that the crust layer (upper layer), supernatant layer (middle layer) and sediment layer ( Bottom layer) is completely mixed, and under suitable conditions and the action of microorganisms, the material is fermented to produce acid; the material after acid production enters the second half and begins to produce methane. Excessive stirring is not conducive to the production of methane by the material, but it also needs Proper agitation helps release methane produced

However, the interior of the existing horizontal fermenter is a single axial mechanical stirring shaft. First, the stirring degree of the two stages before and after fermentation is the same, which wastes energy, and is not conducive to the differential fermentation of the two stages before and after the fermentation, and the fermentation effect is poor; , there is a blind spot in the axial mechanical stirring shaft, especially it is difficult to eliminate the sediment at the bottom of the tank and the layer on the liquid surface of the tank, which leads to uneven mixing of materials and affects the fermentation efficiency. At the same time, the layer on the liquid surface will affect the emission of methane, which is not conducive to Gas collection, affecting fermentation efficiency and biogas utilization

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