Novel anaerobic fermentation tank and up-flow full-mixing type anaerobic fermentation system

Abstract

The invention discloses a novel anaerobic fermentation tank and an up-flow full-mixing type anaerobic fermentation system. The fermentation tank comprises an underground base tank, a feeding chamber and an upper tank wall. The base tank is internally provided with multiple layers of waterproof membranes, an inner gas storage membrane and an outer gas storage membrane are mounted on the upper tank wall, and an air blower is connected between the inner gas storage membrane and the outer gas storage membrane. Compared with concrete or a steel tank, the fermentation tank with the underground portion in a form of the directly coated base tank has advantages of convenience in construction and low manufacturing cost; external mechanical feeding devices are few, production halting caused by mechanical faults is avoided, and convenience in maintenance and low energy consumption are realized; by a heat exchanger, circulation biogas slurry can be heated directly by biogas power generation waste heat and then injected into the fermentation tank, so that fermentation temperature is guaranteed; multiple nozzles are in uniform arrangement and available for injection order switching to guarantee completeness in spraying and stirring; no mechanical device requiring maintenance is arranged in the tank, so that the risk of tank clearing due to faults of equipment in the tank is completely avoided.

Description

technical field [0001] The invention relates to the field, in particular to a novel anaerobic fermentation tank and an upflow fully mixed anaerobic fermentation system. Background technique [0002] Since the development of biogas anaerobic fermentation technology, after decades of practice and exploration of large and medium-sized biogas projects around the world, several technologies have been proved to be relatively successful, among which the fully mixed anaerobic process (CSTR) and upflow technology are the most widely used. UASB fermentation process. These two anaerobic fermentation methods have their own advantages and disadvantages. [0003] Fully mixed anaerobic fermentation tank, in Germany, where the development of biogas projects is the most mature in the world, this form of reactor accounts for more than 95% of the total biogas projects. Fermenters are upright cylindrical tanks, generally large in diameter and relatively small in height. The bottom foundation...

AI Technical Summary

Problems solved by technology

However, the current domestic upflow anaerobic fermentation system has the following problems: 1) The diameter is small and the height is too high, resulting in poor fluid mixing effect and easy to form stratification; 2) The spray pipe is fixed and the spray direction is fixed. Only partial mixing can be formed, and the spray pipe in the tank is easy to block and difficult to maintain; 3) Like the fully mixed anaerobic fermentation tank, in order to maintain the fermentation temperature, a heating coil is installed in the tank, which is not conducive to maintenance

[0005] Whether it is an upflow or fully mixed anaerobic fermentation system, it is necessary to set up an independent mechanical feeding device. During the fermentation process, once the feeding device fails, it will affect the operation of the entire biogas project

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