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Sack dust adding method for blast furnace coal injection

A technology of blast furnace coal injection and bag ash, which is applied in the direction of dust collectors, can solve the problems affecting air permeability and fine dust environmental protection, and achieve the effect of improving the combustion rate

Inactive Publication Date: 2006-03-08
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the environmental protection problems caused by making sintered pellets with bag ash, which affects the air permeability and fine dust. At the same time, the carbon in the bag ash can be recycled in the blast furnace and the iron oxide contained in the bag ash can be used. Improve the combustion rate of pulverized coal

Method used

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Effect test

Embodiment Construction

[0018] at 1200m 3 Blast furnace, wind pressure 0.3MPa, air volume 2800m 3 / min, oxygen enrichment rate 2.0%, pressure 0.7MPa, enter from the cold air duct entering the hot blast stove, air temperature 1180 ℃, coal injection ratio 150kg / t, coke ratio 350kg / t, output 3000t / d, slag amount 280kg / t, pig iron qualification rate is 100%, and the addition of bag ash is 4%. The amount of pulverized coal and bag ash injected is kept at 150kg / t, and the production parameters of the blast furnace remain unchanged.

[0019] Benefit Analysis

[0020] Bag ash contains about 20% carbon, and they can directly replace pulverized coal when burned in front of the tuyeres. In addition, the iron-containing oxides in the bag ash can greatly promote the combustion of pulverized coal. When the amount of ash entering the bag is 4%, the combustion rate of pulverized coal is the highest. The price of pulverized coal injected by blast furnace (including transportation, milling, etc.) is about 630 yua...

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Abstract

This invention relates to a method for adding bag-ash to blast sprayed coal characterizing in adding 2-8% weight percentage of bag-ash into the sprayed coal powder, and the volume keeps at 4% when the oxygen enrichment rate is less than 3% and increase along with the increase of the wind temperature is over 1150deg.C, 2% bag-ash is increased and the oxygen enrichment rate should increase 1%. The carbon in the ash can be used circularly in the oven and the iron oxide in the ash can increase the burning rate of coal powder, in addition to that, the ash can increase the gas permeability during sintering and reduce the circulation of fine dust in the sintering.

Description

technical field [0001] The invention belongs to the field of ironmaking, and in particular relates to a method for adding bag ash to blast furnace coal injection. Background technique [0002] In the prior art, in order to reduce the coke ratio, coal injection in the blast furnace adopts the method of injecting pulverized coal. With the continuous improvement of environmental protection requirements and the reduction of water pollution, the method of collecting fine dust in blast furnace gas after gravity dust removal by cloth bags is used instead of the original washing tower dust removal method, and the dry dust that is convenient for transportation and storage is obtained. Ash. These dry ashes are also called bag ash, and are usually used as raw materials for sintering to make sintered pellets. Because the bag ash is relatively fine, it will not only produce dust pollution when making sintered pellets, but also affect the air permeability of the sintered pellets during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/22
Inventor 韩庆丁汝才吴铿郑涛吴燕一江东才王效东李志毅
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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