Vertical drying machine for tail gas waste heat recycling

Abstract

The invention discloses a raw coal vertical drying machine suitable for using pulverized coal as energy. A high-temperature tail gas flue penetrates the center of the drying machine, and an expansionjoint and at least two layers of rotational flow bodies are arranged at the upper portion of the flue. The outer wall of the drying machine is wrapped by a heat preservation layer. A conical distributor I and a conical distributor II are arranged between an outer barrel and the flue, raw coal flows in a zigzag fold-back manner, and the drying effect is enhanced. A settling chamber is designed on the top of the inner side of the outer barrel and used for settling of dust, the work pressure of a dust remover is relieved, an annular air bellow is located at the lower portion of the outer barrel and communicates with an air tower, air hoods are evenly arranged on the air tower, and uniform hot air inflow is guaranteed. Ventilation holes are formed in the distributors, raw coal drying is enhanced, and airflow resistance in the system is reduced. Spraying pipes are arranged at the upper ends of the distributors, and stacking of the raw coal on the distributors is prevented. According to thevertical drying machine, tail gas waste heat is sufficiently utilized, energy is saved, the drying effect is enhanced, sufficient waste heat utilization is achieved, and raw coal drying energy consumption is reduced.

Description

technical field [0001] The invention is applied to industrial kiln system equipment in industries such as mines, metallurgy, and building materials, and relates to a vertical dryer for drying raw coal by using the waste heat of high-temperature exhaust gas from the kiln, and is especially suitable for industrial kilns using coal powder as energy. Background technique [0002] Industrial furnaces in mining, metallurgy, building materials and other industries are necessary equipment for production. These furnaces are usually designed with heat recovery and comprehensive utilization of high-temperature exhaust gas in mind. attached figure 1 It is a schematic diagram of limestone rotary kiln equipment using pulverized coal as energy, including rotary kiln, preheater, cooler, burner, flue, dust collector, blower and chimney. The rotary kiln calcines the limestone into lime at high temperature, the burner blows coal powder into the rotary kiln to provide high-temperature calcinat...

AI Technical Summary

Problems solved by technology

This cooling method not only wastes waste heat, but also increases power consumption

[0004] The raw coal used as the calcined fuel of the rotary kiln is affected by market conditions, and its water content is often high, sometimes up to 20%, which seriously affects the production efficiency of grinding and processing coal powder from raw coal

In order to meet the fuel demand for rotary kiln calcination, it is usually necessary to set up a separate dryer or hot blast stove to dry the raw coal and then grind it, which increases the complexity of coal powder production equipment, increases the floor area and energy consumption

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