Process and equipment for preparing biogas by continuous mode dry fermentation

Abstract

The invention discloses a process and equipment for preparing biogas by continuous mode dry fermentation. The process comprises the following steps of: mixing various green materials (animal manure, straw, organic waste and the like) uniformly, delivering into a fermentation tank, feeding and discharging once per day, recovering 25-35% of discharged materials into a stirrer and mixing with green materials uniformly, and heating the percolate in the fermentation tank through a spray pump by a heat exchanger and then spraying into a reaction tank. The major equipment comprises a storage bin, a measuring belt, a gathering belt, a screw feeder, a stirrer, a feed screw, an elevator, a feeder, a fermentation tank, a gas reservoir, a biogas outlet tube, a spray tube, a heat exchanger, a spray pump, a discharge screw, a gathering screw, a discharging machine, a recovery screw, a flow-dividing screw, a control system and the like.

Description

technical field [0001] The invention belongs to the fields of energy utilization and environmental protection, and relates to a process and equipment for producing biogas by continuous dry fermentation. Background technique [0002] Biogas anaerobic fermentation can be divided into two categories: wet and dry. Wet anaerobic fermentation is mainly used to produce biogas from liquid waste such as livestock and poultry manure and sludge. The gas production rate is low, and if a large amount of biogas slurry is not treated properly, it will cause secondary pollution. In addition, it will consume a lot of energy in cold regions. The economic benefits are poor. The dry fermentation technology is used to process solid organic waste, and produce organic fertilizer while obtaining biogas. Most of the existing dry-type fermentation technologies are tank-type, chamber-type or other methods. Most of these methods are batch-based. These methods are either difficult to feed and discharg...

AI Technical Summary

Problems solved by technology

Most of the existing dry-type fermentation technologies are tank-type, chamber-type or other methods. Most of these methods are batch-based. These methods are either difficult to feed and discharge materials, expensive equipment, or occupy a large area, and the manufacturing requirements of sealed doors High, the material needs to be moved multiple times, and the requirements for biogas explosion-proof monitoring are high

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