Moving bed anaerobic fermentation reactor

Abstract

An active bed anaerobic fermentation reactor can be used for biogas production. The reactor includes a tank body, a gas collecting hood, a water outlet pipe and a water inlet pipe. The gas collecting hood is arranged on the upper part of the tank body, the porous baffle is arranged under the gas collecting hood, the upper and lower movable beds are arranged under the baffle, and the upper movable bed is provided with a lifting device. An air bag is arranged under the lower movable bed, and a side door is arranged at the lower part of the tank body. When working, use a loader to load fermented materials such as straw into the tank from the side door, filling the space between the baffle and the lower movable bed. Inject biogas slurry to submerge the lower opening of the gas collecting hood for anaerobic fermentation. As the biogas is discharged, the volume of the fermented material is continuously reduced, and the air bag is inflated in time to keep the liquid level from falling. After the gas production is over, the liquid is drained first and then the slag is discharged. The reactor uses less water, directly reuses sewage, zero discharge, efficient and convenient loading and unloading, and less investment in equipment.

Description

technical field [0001] The invention relates to an anaerobic fermentation reactor used in biogas production. Background technique [0002] Biogas is a clean and renewable energy source. Anaerobic fermentation reactor is the core device in biogas production. Anaerobic fermentation reactors (hereinafter referred to as fermentation reactors) are generally divided into two categories, namely wet fermentation reactors and dry fermentation reactors. The several reactors disclosed in pages 49-57 of "Design and Application of Large and Medium-Sized Biogas Projects" published by Chemical Industry Press in 2013 and edited by Tang Yanfang are all wet fermentation reactors, and their basic structures include tanks, outlet pipes , Inlet pipe. During work, the fermented material is mixed with water and sent into the tank for anaerobic fermentation to generate biogas. Due to the limitations of pipeline valves and water pumps, the particle size of the material in the mixed solution cann...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) large water consumption, high energy consumption in winter (up to 30-45% of self-production capacity); (2) large amount of sewage, and secondary pollution of biogas slurry that cannot be used up, requiring high investment Sewage treatment costs; (3) A large amount of agricultural and forestry solid waste such as straw cannot be treated

The disadvantages are: (1) Because there is no or almost no free water flow between the materials in the dry fermentation reactor, there is a serious concentration gradient in the fermentation material, and heat and mass transfer are difficult; PH value, temperature and other parameters are difficult to control, and the equipment technical requirements are very high; (3) For rigid reactors, the remaining biogas must be replaced at the end of gas production to ensure safe operation; (4) Large and medium-sized fermentation reactors enter and exit Material difficulty

A large amount of agricultural and forestry waste such as straw and other solid biological organic matter have not been effectively utilized

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