Technology of producing biogas with biomass straw through anaerobic fermentation

Abstract

The invention discloses a technology of producing biogas with biomass straws through anaerobic fermentation. The steps of the technology are: (1) using a chopping and rubbing machine to process the biomass straws into soft filament strips with a length of 1.5 to 2.5 cm; (2) transmitting the straws of soft filament strips into a pretreatment pool through a conveyer, adding the biogas slurry back flowed from an anaerobic reactor into the pretreatment pool, fully stirring, the total solid concentration of the straw material liquid after stirring being 20 percent and retting the straw material liquid in the pretreatment pool for 5 to 7 days; (3) transferring the straw material liquid into the anaerobic reactor installed with a shell-breaking device for fermentation at a temperature of 30 to 40 DEG C to produce biogas.

Description

technical field [0001] The invention relates to a biogas production process, in particular to a process for producing biogas by anaerobic fermentation of biomass straw. Background technique [0002] my country will produce about 700 million tons of biomass straw every year, including rice straw, corn straw, wheat straw, etc., most of which are not used, which not only causes waste of resources, but also pollutes the environment. Anaerobic fermentation of straw to produce biogas is an effective way to utilize straw. However, as the main fermentation raw material, straw has long fermentation start-up time, low gas production rate, low raw material utilization rate, and easy crusting of raw materials, which affects the progress of fermentation and raw materials. access and other issues. This is mainly because the content of lignin, cellulose and hemicellulose in the straw is relatively high, and these macromolecules are entangled with each other and are not easy to degrade, wh...

AI Technical Summary

Problems solved by technology

Simply cutting short, the power consumption of general guillotine cutting machines is relatively low, and the energy consumption is relatively reasonable, but the particle size of straw is generally about 3-5 cm, the particle size is relatively large, and the dense structure of straw is not easily damaged, and lignin, cellulose and semi The degradation rate of organic solids such as cellulose is not high, the start-up time of anaerobic fermentation for biogas production is long, it is easy to float and crust in the reactor, the gas production rate is low, and the utilization rate of raw materials is low

With crushing treatment, the particle size of the straw can be less than 1cm, the degradation rate of organic solids has been improved, it is not easy to crust, and the gas production rate has been improved, but the small particle size of the crushing generally leads to relatively large power consumption of the crusher Higher and less economical, which limits the large-scale development and utilization of biomass straw

[0005] The existing straw fermentation needs to add microbial fermentation bacteria to the straw. After the fermentation is completed, the biogas slurry and biogas residue are directly discharged or used to make organic fertilizer, and the biogas slurry cannot be fully utilized.