Equipment and method for directly depredating straw raw material in methane tank

Abstract

The invention discloses a device for directly degrading straw raw materials in a biogas generating pit and a method thereof. The device comprises a water-permeable interlayer (1), and a plurality of air ducts (4) of air outlets (5) arranged at the upper part of the water-permeable interlayer (1), wherein, the straw raw materials (6) and fermentation inocula are arranged above the air ducts (4), fermentation liquor (7) is arranged at the lower part of the water-permeable interlayer (1), the fermentation liquor (7) is connected with a circulating pump (8), a spray pipe (10) with a nozzle (9) isconnected on the circulating pump (8), and the spray pipe (10) is arranged above the straw raw materials (6). Biogas is generated by the following steps: the straw raw materials are put into the biogas generating pit and added with the fermentation inocula, the carbon-nitrogen ratio and the concentration of the fermentation liquor are adjusted, the fermentation liquor is sprayed on the straw raw materials, the wetted straw is evenly aerated, and then bacterial strains are introduced after the fermentation. The device and the method can avoid the steps of manual materials mixing and the fermentation of aerobic stacking, which increases the fermentation speed of the straw raw materials.

Description

technical field [0001] The invention belongs to the technical field of straw biogas production, in particular to equipment and a method for directly degrading straw raw materials in a biogas pit. Background technique [0002] The lignocellulose content of straw is higher than that of other biogas fermentation plant raw materials, and it is not easy to be directly digested by anaerobic bacteria. The digestibility of anaerobic fermentation is low, the speed is slow, and the gas production is small. Gas velocity and gas production, the straw raw materials currently popularized and used in the straw biogas digester need to manually mix the straw raw materials before entering the biogas digester, adjust the carbon-nitrogen ratio of the additives, and then carry out a long-term process after the proportioning is completed. Aerobic stacking fermentation, but the method of artificial aerobic stacking fermentation not only occupies a large area of ​​land, is labor-intensive and time-...

AI Technical Summary

Problems solved by technology

[0002] The lignocellulose content of straw is higher than that of other biogas fermentation plant raw materials, and it is not easy to be directly digested by anaerobic bacteria. The digestibility of anaerobic fermentation is low, the speed is slow, and the gas production is small. Gas velocity and gas production, the straw raw materials currently popularized and used in the straw biogas digester need to manually mix the straw raw materials before entering the biogas digester, adjust the carbon-nitrogen ratio of the additives, and then carry out a long-term process after the proportioning is completed. Aerobic stacking fermentation, but the method of artificial aerobic stacking fermentation not only occupies a large area of ​​land, is labor-intensive and time-consuming, pollutes the environment, but also it is difficult to control the carbon-nitrogen ratio in straw raw materials, and aerobic fermentation is not easy Uniform, simultaneous fermentation is greatly affected by the outside temperature, and the aerobic retting fermentation effect in winter is very poor and the efficiency is low

Images