Dust removal system at the tail of the chain grate machine

Abstract

The invention relates to a dust removing method in the production process of metallurgical pellets, in particular to a dust removing system of a chain grate machine tail part. The dust removing system comprises a chain grating machine tail part mechanism with a chain grate machine wheel and a chain grate machine tail wheel return device; the dust removing system is characterized in that a machine tail seal cover is arranged on the chain grate machine tail part mechanism; chain grate machine tail wheel return segment dust removing devices are arranged on the upper part of the machine tail seal cover; an overall chain grate machine tail dust removing device is arranged in the middle part of the machine tail seal cover; and a tail sealing wind box dust removing device of the chain grate machine is arranged at the end part of the lower return of the chain grate machine tail. According to the dust removing system provided by the invention, as the chain grate machine tail wheel return segment dust removing devices are arranged at the three main dust-raising spots of the chain grate machine tail mechanism, and are connected with external exhaust fans by pipelines, thereby forming a negative pressure environment; the three dust removing systems are compensated to one another and are linked with one another, so that the high temperature waste gas can be effectively prevented from overflowing, the tail machine environment of the chain grate machine workshop can be improved, the service life of the heat resistant parts of the equipment can be ensured; and moreover, the temperature gradients of the materials are smoothed, and the mine return quantity of the cured pellets can be reduced.

Description

technical field [0001] The invention relates to a dust removal method in the production process of metallurgical pellets, in particular to a dust removal system at the tail of a chain grate machine. Background technique [0002] In the production process of pellets in the metallurgical industry, qualified green balls are sent to the chain grate machine tool through a wide tape, and then through the blast drying section, exhaust drying section, and preheating section to complete the heating, drying, preheating, oxidation process. The disadvantage of this combination of drum-pumping and drying process is that the environment of the post at the tail of the machine is relatively harsh. The specific problems are: (1) The dust pollution at the tail of the machine is relatively large. First of all, when the green balls enter the drum drying section (180°C-250°C) from the ambient temperature at the tail of the chain grate machine, under the action of the blower, the hot air penetra...

AI Technical Summary

Problems solved by technology

The disadvantage of this combination of drum-pumping and drying process is that the environment at the tail of the machine is relatively harsh. The specific problems are: (1) The dust pollution at the tail of the machine is relatively large

First of all, when the green balls enter the drum drying section (180°C-250°C) from the ambient temperature at the tail of the chain grate machine, under the action of the blower, the hot air penetrates the material layer from bottom to top to heat and dehydrate the green balls, and the main waste gas produced is released from the The chimney is discharged, but due to the positive pressure in the hood, part of the hot exhaust gas also overflows from the gap between the tail material layer and the lower opening of the retaining wall, generating dust, causing poor environment, hot air pollution, and rising ambient temperature, which not only affects production but also affects workers. There are also potential safety hazards in production operations; (2) The high-temperature radiation pollution at the tail of the machine is serious, that is, there is a temperature difference between the return section and the material receiving section, and when the material enters the blast drying section of the chain grate machine (180 ° C ~ 250 ° C) from normal temperature, it is also due to the temperature The moisture in the pellets turns into dusty gas and emerges from the tail of the chain grate machine, seriously affecting the environment

At the same time, this kind of temperature fluctuation will also reduce the service life of the equipment (mainly due to small deformations such as small shafts, return cleaning scrapers, etc.), and at the same time, a small amount of water vapor in the environment enters the lower space and repeatedly contacts with structural parts that were once high. Affect the life of components and increase the workload of maintenance

At the same time, because the qualified raw balls directly enter the chain grate drum drum section (180°C-250°C) from normal temperature, the gradient of temperature change is too large, resulting in an increase in the amount of balls and returning ore, which affects production efficiency

Images