Smashing, screening and circulating coal feeding system

Abstract

The invention relates to a smashing, screening and circulating coal feeding system which comprises a mixed coal bunker, a coal feeding material nozzle, an iron separator, a smasher and a number one coal feeding belt conveyor. The lower portion of the number one coal feeding belt conveyor is connected with the mixed coal bunker, the coal feeding material nozzle is positioned at the bottom of the mixed coal bunker, the lower portion of the coal feeding material nozzle is connected with the smasher, and materials after being processed are conveyed to a boiler by the belt conveyor. The smashing, screening and circulating coal feeding system is characterized in that a vibratory screening machine is additionally arranged at an outlet of the smasher, a material separating nozzle is arranged on the lower portion of the vibratory screening machine and connected with a number two below-screen belt conveyor, coal briquette with qualified granularity is conveyed to the boiler by the number two below-screen belt conveyor, materials on a screen of the vibratory screening machine are conveyed to a number three above-screen belt conveyor, and a hanging rack is arranged on the end portion of the number three above-screen belt conveyor. By the smashing, screening and circulating coal feeding system, resource waste caused by incomplete burning of large-sized coal is effectively reduced, burning efficiency of the coal briquette is improved, production cost of the boiler is reduced, and the problems of difficulty in raw coal separating and high load of the coal smasher are solved. The smashing, screening and circulating coal feeding system is suitable for closed cycle processes like smashing, screening, separating and the like of bulky materials.

Description

technical field [0001] The invention relates to a crushing and screening circulating coal supply system, which belongs to the automatic closed-circuit circulating coal supply technology of boiler crushing and screening. Background technique [0002] Ekou Iron Mine is the production base of iron ore powder, the main raw material of Taiyuan Iron and Steel (Group) Company. The base uses two 35-ton boilers to supply air and heat to the living area. The type is a type II layout, which is composed of main components such as the drum, the internal device of the drum, the water pipe system, the economizer, the air preheater, the air distribution system, the coal feeder, and the flue gas separator. [0003] The boiler coal supply system is the main equipment for the 35-ton boiler gas supply in Ekou Iron Mine. The coal supply system is to put the coal with a particle size of 0-100mm into the furnace through the coal feeder for sulfidation and combustion, and generate high-temperature ...

AI Technical Summary

Problems solved by technology

[0004] Defects in the coal supply system of the original boiler: the particle size of pulverized coal is uneven, which reduces the combustion heat of coal particles; and it contains large lumps of coal, which makes the coal particles burn insufficiently (the coal slag contains black cores), which reduces the combustion efficiency

Ekou Iron Mine used to crush the raw coal directly into the boiler for combustion. After the crushing, no vibrating screen was designed to check the particle size, resulting in uneven particle size, resulting in insufficient combustion of coal particles (the coal slag contains black cores), and reduced combustion. efficiency

There are many large pieces of coal cinder, many failures of the slag extractor, and difficult slag discharge

Incomplete combustion of pulverized coal will increase the unit consumption of pulverized coal and increase the cost of steam production

In particular, increasing the load of the coal breaker and the uneven particle size of the coal block have seriously affected the boiler production operation rate and efficiency. Increasing the load of the slag extractor has caused major hidden dangers such as low combustion efficiency and coking of the fluidized bed, which has seriously affected equipment management and production organization. bring great difficulty

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