External circulating fermentation technique and device thereof

Abstract

The invention relates to an external circulating fermentation technique and a device thereof. The technique comprises the following steps that: step (A), materials flow into a fermentation tank of the device naturally by a material outlet of a dry-type fermentation device; step (B), the materials in the fermentation tank are pumped into a heat exchange device for heating, and after the temperature rises, the materials return into the fermentation tank for heat preservation and fermentation by a circulating pump; and step (C), the materials in the fermentation tank are fermented continuously so as to generate methane, and the methane slag and methane liquid are discharged from respective outlets. The device comprises the fermentation tank, the heat exchange device, an inner film, an outer film, the circulating pump, a control system and the like; the heat exchange device is arranged outside the fermentation tank; the fermentation tank is provided with a methane outlet valve and a material outlet valve, and the top part of the fermentation tank is provided with the inner film and the outer film in sequence; the upper part of the outer film is provided with a safety valve; a gas-filled cavity is formed between the inner film and the outer film; an air blower and a pipeline are communicated with the gas-filled cavity; the lower part of the tank is provided with a temperature sensor; and the control system is electrically connected with the temperature sensor and the heat exchange device. The invention is mainly applied in dry-type fermentation techniques of crop straws.

Description

1. Technical field [0001] The invention relates to a method and equipment for microbial anaerobic treatment of agricultural waste, animal husbandry waste and industrial waste water, in particular to an external circulation fermentation process and device. 2. Background technology [0002] At present, anaerobic fermentation methods and equipment mainly include fully stirred anaerobic fermentation process, anaerobic contact process reactor, upflow anaerobic sludge bed reactor and upflow anaerobic solid reactor, etc. These methods and process equipment have the following disadvantages or deficiencies: ①The materials targeted by the equipment are mainly animal husbandry manure. Since the carbon-nitrogen ratio of straw is much higher than the carbon-nitrogen ratio required by anaerobic fermentation itself, it is not yet possible to treat agricultural straw materials. Carry out fermentation treatment; ②Built-in heat exchange is mostly used, the tank body is easy to corrode, poorly...

AI Technical Summary

Problems solved by technology

These methods and process equipment have the following disadvantages or deficiencies: ①The materials targeted by the equipment are mainly animal husbandry manure. Since the carbon-nitrogen ratio of straw is much higher than the carbon-nitrogen ratio required by anaerobic fermentation itself, it is not yet possible to treat agricultural straw materials. Carry out fermentation treatment; ②Built-in heat exchange is mostly used, the tank body is easy to corrode, poorly sealed, and easily affected by anaerobic bacteria; ③The equipment is complicated, and the fermentation tank must be equipped with a special gas storage tank, which occupies a large area and has poor operation safety; ④Many supporting facilities, large investment and high operating cost

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