Hollow stirring shaft for oil bath heating of sludge hydrolysis treatment equipment

Abstract

The invention relates to a hollow stirring shaft for oil bath heating of sludge hydrolysis treatment equipment. The hollow stirring shaft comprises a shaft body and stirring blades, a plurality of stirring blades are arranged on the shaft body in the axial direction of the shaft body, a hollow structure penetrating in the axial direction is arranged in the shaft body, a cavity is formed in the stirring blade, and through holes communicating the cavities with the hollow structure are formed in the side wall of the shaft body connected with the stirring blades. The hollow stirring shaft has the advantages that the shaft body and the stirring blades are of hollow structures, the hollow structures are filled with high temperature liquid (e.g., high temperature oil), and the high temperature liquid flows in the hollow structures, so that heat is transferred between the surfaces of the shaft body and the stirring blades and the interior of sludge, stirring heating on the interior of the sludge is completed, the situation that the sludge is not heated uniformly due to heating of a tank interlayer is avoided, the heating efficiency is improved, and simultaneously, the sludge heat hydrolysis treatment is more thorough.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a hollow stirring shaft used for oil bath heating of sludge hydrolysis treatment equipment. Background technique [0002] Sludge is a by-product produced in the process of sewage treatment. The composition of sludge is extremely complex, mainly containing about 80-90% water, and other organic matter that can be recycled, various organic matter, various trace elements, and possible environmental hazards. Pathogenic microorganisms, parasite eggs, heavy metals, etc. that have adverse effects. The harmless and resourceful treatment of sludge is an important issue in the protection of the ecological environment worldwide. [0003] Traditional sludge treatment methods include throwing into the sea (or direct discharge), landfill and composting, but they all have negative impacts on the environment (water pollution, soil pollution, air pollution, etc.) and space resources (lan...

AI Technical Summary

Problems solved by technology

The existing sludge thermal hydrolysis treatment methods mainly have the following disadvantages: (1), the sludge is heated slowly during the heating process, the heating time is long, and the treatment efficiency is low; (2), the sludge in the tank is heated by the tank interlayer , so that the surface temperature of the sludge is high, and the internal heat of the sludge is less, which is prone to incomplete treatment.

Images