Sludge drying device

Abstract

The invention discloses a sludge drying device which comprises a drying rotary drum; the drying rotary drum comprises a horizontally arranged outer rotary drum and an inner rotor arranged in the outer rotary drum, the two ends of the drying rotary drum are an inlet end and an outlet end respectively, the inlet end is connected with a gas inlet chamber used for introducing hot flue gas, and the outlet end is connected with a gas outlet chamber used for discharging low-temperature hot flue gas; the drying rotary drum is sequentially divided into a front section, a middle section and a rear section from the inlet end to the outlet end, the outer rotary drum and the inner rotor rotate in the same direction, a plurality of stirring rods are arranged on the inner rotor, and the stirring rods are arranged in a double-helix shape; and an auxiliary crushing structure is arranged on the inner wall surface of the outer rotary drum. According to the sludge drying device provided by the invention, high-temperature hot flue gas is used for direct drying, the heat transfer efficiency is high, and the drying effect is good; the specific surface area replacement speed is high and the drying efficiency is high; drying is conducted in a Brownian motion mode, and drying is uniform; equipment abrasion is reduced, and the service life of equipment is prolonged; the mechanical energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a screw propulsion sludge drying device. Background technique Background technique [0002] With the development of modern industry, a huge amount of various types of urban domestic sludge and industrial sludge are produced around the world every year. Among them, various types of sewage and wastewater treatment plants will produce a large amount of wet sludge with high water content, which needs to be dried before being incinerated in an incinerator or transported for other purposes. The sludge drying technology is A common technology that can effectively reduce the moisture content of sludge so that it can continue to be processed further is the process of heating the sludge in specially designed equipment and evaporating the water in it. It can not only effectively remove the "free water" in the sludge, but also quickly evaporate the "interstitial water", "surface ...

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Problems solved by technology

[0003] The present invention aims to overcome the above-mentioned problems of low drying efficiency, poor drying effect, uneven drying, and large wear and tear during the installation process that will affect the service life of the drying equipment in the existing drying device, and provides a sludge Drying device, high-temperature hot flue gas is directly dried, with high heat transfer efficiency and good drying effect; fast specific surface area replacement speed and high drying efficiency; drying is carried out by Brownian motion, and the drying is uniform; reducing equipment wear and improving equipment service life; Reduce mechanical energy consumption

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