Dry straw fermentation device

Abstract

The invention provides a dry straw fermentation device. In the dry straw fermentation device, straw is discharged in a way of combining upward push flow with a mechanical structure, straw is fed from a straw feeding hole at the bottom of a fermentation tank body, the straw fed at an earlier stage is pushed upwards to form upward push flow, finally enters a gravity precipitator, and is discharged through a spiral conveyer, so that material change is completed; in a material changing way, the straw is prevented from forming hardening and a tower-bridge phenomenon easily, and fermentation is performed in combination with spraying, so that active sewage can be contacted fully with straw, and the gas producing rate is increased; by adopting a dry fermentation technology and circular utilization of active sewage, the water using amount is greatly reduced, sewage is drained hardly, and the resource utilization ratio is high; and moreover, a heat exchange pipe is arranged at the bottom of the fermentation tank body, so that the temperature of active sewage and the internal temperature of the fermentation tank can be kept, the fermentation temperature is kept at about 35 DEG C, and a best fermentation effect is achieved.

Description

technical field [0001] The invention relates to the technical field of biogas preparation devices, in particular to a straw dry fermentation device. Background technique [0002] Straw is the general term for the stems and leaves (ears) of mature crops. Usually refers to the remaining parts of wheat, rice, corn, potatoes, oilseeds, cotton, sugar cane and other crops after harvesting seeds. More than half of the photosynthetic products of crops exist in straw, which is rich in nitrogen, phosphorus, potassium, calcium, magnesium and organic matter, etc., and is a multi-purpose renewable biological resource. and rich in nutrients. After research and development, crop straws have become one of the main raw materials for preparing biogas. [0003] At present, in the method of using straw as raw material for the preparation of biogas, straw wet fermentation is widely used. This fermentation method has a low concentration of raw materials and requires a lot of water. After the f...

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Problems solved by technology

[0003] At present, in the method of using straw as raw material for the preparation of biogas, straw wet fermentation is widely used. This fermentation method has a low concentration of raw materials and requires a lot of water. After the fermentation is completed, it is difficult to treat the fermentation residue, causing additional environmental pollution; At the same time, due to the small specific gravity and poor fluidity of crop straws in the liquid, when the crop straws are crushed to 10mm in the configuration of stirring, a large amount of scum will still be produced on the surface of the fermentation liquid, forming a clear separation with the lower layer of fermentation liquid. layer, it is easy to form compaction, which causes the crop stalks to not fully contact with the fungi in the fermentation liquid, which affects the gas production efficiency and gas production of the fermentation; for the discharge method of the fermented crops, the automatic gravity discharge method is generally used now. The phenomenon of hardening is serious, and it is difficult to store materials, so that the production cannot continue to run normally; when special equipment is used to crush the straw to less than 2mm, the discharge situation has improved, but the power consumption per ton of material has reached 20-30kwh, and the cost has increased significantly. Economical Poor benefit, reducing the practicability of the device

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