Vertical dry anaerobic system adopting bottom feeding and top discharging

Abstract

The invention discloses a vertical dry anaerobic system adopting bottom feeding and top discharging. The vertical dry anaerobic system comprises a feeding back-mixing tank, an anaerobic fermentation tank, a discharging tank and a sand discharging device, wherein the upper part of the side wall of the feeding back-mixing tank is connected with a raw material feeding pipe, the bottom of the side wall is connected with a steam pipe, and the bottom end of the feeding back-mixing tank is connected with a feeding plunger pump; a heat insulation coil pipe is arranged outside a shell of the anaerobicfermentation tank, an anaerobic tank feeding pipe is arranged at the bottom of the shell, one end of the anaerobic tank feeding pipe is connected with the feeding plunger pump, the center of the bottom end of the shell is connected with a sand discharging pipe, and a plurality of spiral discharging machines are uniformly arranged at the upper part of the side wall of the shell and are respectivelyconnected with a material returning pipe and an anaerobic tank discharging pipe; the top of a shell of the discharging tank is connected with the anaerobic tank discharging pipe, the bottom of the shell is connected with a discharging pipe, and a discharging plunger pump is installed at the bottom of the discharging pipe; and the sand discharging device is connected with the bottom of the sand discharging pipe. The system can adapt to materials with 20-25% of solid content during feeding and dross in a layered mode during discharging, and the range of the water content of a feedstock in a vertical dry anaerobic fermentation technology is expanded.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a vertical dry anaerobic system with bottom feeding and top discharging. Background technique [0002] At present, waste classification has become a new fashion, and it is the general trend to treat high-solid and easily degradable organic waste separately. At present, there are two types of dry anaerobic digestion technologies commonly used in my country: vertical and horizontal. Compared with the vertical anaerobic fermentation technology, the horizontal anaerobic fermentation technology occupies a larger area and has higher investment. The mature vertical dry anaerobic digestion technologies mainly include the Dranco process and the Valorga process. However, the existing vertical dry anaerobic digestion technologies are all derived from foreign countries. For the kitchen waste in my country, the content of light and heavy impurities is high, and the solid content is lowe...

AI Technical Summary

Problems solved by technology

The scum layer hinders fermentation to produce biogas, causing excessive pressure in the tank and posing safety hazards

The sand layer blocks the pores and hinders the stable operation of the push flow in the tank

[0006] In summary, although the current existing technology can effectively deal with high-solid and easily degradable organic waste with high solid content and low miscellaneous content, the solid content of kitchen waste in my country is less than 25%, and the content of foreign matter is high. The problem of slag and sand settling needs to be improved, so a new anaerobic system suitable for the characteristics of kitchen waste in my country is needed to meet the needs of classified kitchen waste treatment projects

Images