Upgraded northern large-sized or medium-sized biogas digester

Abstract

The invention relates to an upgraded northern large-sized or medium-sized biogas digester. The upgraded northern large-sized or medium-sized biogas digester comprises a digester body, wherein heat preservation layers are laid on the bottom and the side wall of the digester body; a digester top cover is arranged on the top of the digester body, dumping grooves which are 2-5 meters long are formed in the periphery of the digester top cover at inclination angles of 5-15 degrees in directions of outer edges, a feeding opening is formed in the digester top cover, a vertical stirrer is additionallyinstalled at a center of the digester top cover, the bottom of the vertical stirrer is provided with two stirring blades, the two stirring blades are located in positions, a half to one third of a distance from the bottom of the digester to a liquid level, and the upper portion of the vertical stirrer is provided with a crust breaking blade parallel to the liquid level in the digester body; a discharging groove is formed in one side of the digester body, and a cutting sewage pump used for discharging residual liquid after fermentation is additionally installed in the discharging groove; and awarming greenhouse is built in a position, corresponding to the ground, the periphery of the top of the digester body, and before the heat preservation layers are laid, the biogas digester is emptiedand cleaned thoroughly. The biogas digester meets the use requirements of a user in winter, the utilization efficiency and use convenience of the biogas digester are improved, the risks of layering and crusting of the interior of the digester body are lowered, and the system stability is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, in particular to an upgraded large and medium-sized biogas digester in the north. Background technique [0002] Large and medium-sized biogas projects are medium-sized biogas projects (the total fermentation volume of single or multiple monomers is not less than 100m 3 ) and large-scale biogas projects (the total fermentation volume of single or multiple monomers is not less than 500m 3 , or the daily gas production is greater than 1000m 3 ) in general, most of them currently use the normal temperature anaerobic digestion process, that is, in the underground concrete pool, biogas is produced under natural ambient temperature conditions. The establishment of large and medium-sized biogas projects has solved the problem of solid organic waste and sewage pollution such as livestock manure in rural areas, effectively improved the level of energy utilization in rural areas, and bro...

AI Technical Summary

Problems solved by technology

Firstly, for users of large and medium-sized biogas projects in the north, the low temperature in winter makes the fermentation temperature in the tank only maintain at 5-10°C, resulting in the failure of normal operation; secondly, the diameter of the feeding port of traditional biogas projects is 20-30cm, which is generally too small , the feeding speed is slow, easy to overflow, easy to block, resulting in inconvenient operation; third, after the fermentation substrate is added, due to density difference and uneven mixing, stratification, crusting and other phenomena generally occur, resulting in a decrease in the gas production of the biogas digester, serious Leading to the scrapping of the biogas project; finally, the remaining mixture of fermentation is mostly pumped by the excrement truck, and the volume of a single truck is generally 1-2m 3 , for a total volume of more than 100 cubic meters, the efficiency is low and the pipeline is easy to be blocked

Images