A Divergent Coal Injection Device for Blast Furnace

Abstract

The invention discloses a divergent coal injection device for a blast furnace, comprising a connecting pipe, a pulverized coal feeding pipe is connected to the center of the top of the connecting pipe, and an air supply pipe is fixedly connected to one end of the connecting pipe. One end of the air supply pipe away from the connecting pipe is fixedly connected with an air supply air hood, the center of the air supply air hood is installed with a main blower, and the center of the outside of the air supply air hood is fixedly connected with a protective net, and the connecting pipe is far away from the air supply air hood. One end of the air duct is fixedly connected with a blowing pipe, and one end of the blowing pipe away from the connecting pipe is fixedly connected with a diffusion cover, and the center of the front and rear ends of the outer wall of the diffusion cover is respectively installed with a first auxiliary coal injection fan and a second auxiliary injection fan. Coal blower. The invention can not only realize strong blowing, but also fully diffuse the pulverized coal, thereby improving the uniformity of distribution and the combustion efficiency of the pulverized coal.

Description

technical field [0001] The invention relates to blast furnace smelting technology, in particular to a divergent coal injection device for blast furnaces. Background technique [0002] Blast furnace coal injection is mainly composed of raw coal storage and transportation, coal powder preparation, coal powder transportation, coal powder injection, dry gas preparation and gas supply power system. Modern blast furnace smelting needs coke, and its role in the blast furnace is to provide the smelting process. heat; the reducing agent needed to reduce iron ore; and the framework to maintain the air permeability of the blast furnace material column (especially the reflow zone and its lower part). The anthracite powder or bituminous coal powder or the mixed coal powder of the two can replace coke to provide heat and reducer, thereby reducing the coke ratio and reducing the cost of pig iron. It is a major technological revolution in modern blast furnace smelting. Blast furnace coal i...

AI Technical Summary

Problems solved by technology

[0003] The divergent coal injection device used in the blast furnace is to blow the pulverized coal after coal grinding and dedusting into the blast furnace, but there are certain defects in the structure design of the existing injection device. The powder is blown out in a straight-through manner, and the uniformity and diffusion of the coal injection cannot be guaranteed during the coal injection process, and the nozzle holes are often blocked, and later maintenance and maintenance are also difficult

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