Vertical drying machine uniform in air distribution

Abstract

The invention provides a vertical drying machine comprising a feed bin, a distribution cone, a drying barrel and a discharge hopper. The vertical drying machine is characterized in that the drying barrel comprises an inner barrel, an outer barrel and an air duct, a retainer ring is arranged between the inner barrel and the outer barrel, a drying passage is formed by gap of the retainer ring, and a circular vent is formed between the inner barrel and the outer barrel. The air duct is a circular barrel surrounding the outer barrel and divided into an upper exhaust barrel and a lower air-inlet barrel, the upper exhaust barrel is provided with an exhaust outlet, the lower air-inlet barrel is provided with an air inlet, and a partition is arranged between the exhaust barrel and the air-inlet barrel to prevent direct circulation between the exhaust barrel and the air-inlet barrel. By the aid of the circular air duct and the circular vent, hot air circulates uniformly along the circumference, and defects that materials are uneven in drying and even caught fire due to local overheating are avoided. In addition, materials are heated twice by hot air, heat exchange is carried out sufficiently, and heat utilization efficiency is improved.

Description

technical field [0001] The invention relates to a drying device, in particular to a drying machine for drying granular combustible materials. Background technique [0002] At present, large-scale drying equipment for drying granular materials in industrial production commonly includes rotary dryers and vertical dryers, among which vertical dryers have the advantages of small footprint, high drying efficiency, and low investment. It has been widely used in the market. [0003] The vertical dryer is composed of a hot blast stove, a material hoist, the main body of the dryer and a discharge device. Its working principle is that the material to be dried is lifted by the hoist to the hopper on the top of the dryer, and the material itself Gravity disperses the material through the material distribution cone to form a cylindrical material layer. The hot air is forced by the induced draft fan to pull the heat horizontally through the material layer for heat exchange. The generated...

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Problems solved by technology

[0004] The existing vertical dryer introduces the hot air into the dryer or exhausts the exhaust gas through the air-introduction flue or the air-introduction pipe. For example, this technical solution is adopted in Chinese patent applications 201010546610.3 and 200710061499.7. Due to the limitation of the caliber structure of the air duct or the air duct, the hot air in the dryer cannot evenly pass through the material layer to heat the material, and the hot air flow at the air duct or the air duct is high, resulting in uneven drying of the material, and even local overheating. causing the material to catch fire

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