Self-sealing type low-rank coal and coal slime negative pressure drying device

Abstract

The invention discloses a self-sealing type low-rank coal and coal slime negative pressure drying device. The self-sealing type low-rank coal and coal slime negative pressure drying device comprises a spiral feeder, a drying barrel and a spiral discharger which are connected in sequence in a matched manner, wherein the spiral feeder is provided with a feeding opening; the spiral discharger is provided with a material outlet; spiral blades in the spiral feeder and the spiral discharger are fixedly connected with a central hot air pipe; coal scrapers achieving stirring and loosening effects are uniformly arranged around the inner wall of the drying barrel at equal intervals; heat exchange pipes for supplying heat needed by coal drying are arranged in the drying barrel; the spiral discharger is provided with a vapor discharging opening; the vapor discharging opening is connected with a dust collection device through a vacuum pump. The negative pressure drying device is ingenious in structural design; by the use of a spiral extruder type structure, continuous feeding and continuous discharging of coal are realized, and a self-sealing state of the drying device is achieved; due to the adoption of an indirect heating mode, the device has the advantages of preventing high-temperature spontaneous combustion and avoiding explosion; furthermore, water in a coal material can be further removed efficiently and quickly.

Description

technical field [0001] The invention relates to a self-sealing low-rank coal and coal slime negative pressure drying device, which belongs to the technical field of coal drying equipment. Background technique [0002] Low-rank coal is mainly lignite, long-flame coal, non-caking coal, weakly caking coal, etc. Due to its low coalification degree, developed pores, high water content (usually 30%-50%), and low calorific value, its volatile High portion, low ignition point. Coal slime is produced during the crushing and separation process of coal, which usually needs to go through flotation and pressure filtration, but the water content of the coal slime after pressure filtration is still very high (usually not less than 20%). The high moisture content of low-rank coal and coal slime directly affects its use, transportation and storage. Because the moisture in coal increases, the useful components decrease relatively, and the moisture turns into steam to absorb heat during comb...

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