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Combustion-supporting fire coal additive and use method thereof

A coal-burning additive and raw coal technology, which is applied in fuel, solid fuel, petroleum industry, etc., can solve the problems of reduced combustion efficiency, reduced blast furnace air permeability, liquid permeability, and reduced coal coke replacement ratio, so as to improve pulverized coal fuel sex and effect

Pending Publication Date: 2015-12-30
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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AI Technical Summary

Problems solved by technology

[0003] Now, with the continuous increase of the blast furnace coal injection ratio, the combustion conditions of pulverized coal in the blast furnace deteriorate, the combustion efficiency decreases, and the coal coke replacement ratio decreases.
At the same time, in the case of insufficient combustion of pulverized coal in the blast furnace, the unburned pulverized coal will block the pores of the material column in the blast furnace, reducing the air permeability and liquid permeability of the blast furnace

Method used

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Embodiment Construction

[0017] Below in conjunction with embodiment the present invention is described in further detail.

[0018] The configuration and usage method of the combustion-supporting coal-burning additives, steel-making converter slag is used as the main raw material, after pulverization and iron removal, the composition is prepared to obtain the combustion-supporting coal-burning additives, see Table 1, and the flow rate value of the receiving hopper valve is set in the coal injection workshop , so that the coal injection additive and coal powder are mixed in a weight ratio of 1 to 8%. After mixing, they are ground by a coal mill and fully mixed evenly. Then, the coal powder mixed with combustion-supporting additives is sprayed into the The blast furnace burns.

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Abstract

The invention relates to a combustion-supporting fire coal additive. The combustion-supporting fire coal additive is prepared by taking steel-making furnace slags as the main raw material through blending and grinding. The combustion-supporting fire coal additive is prepared from, by weight, 13%-20% of FeO, 6%-15% of SiO2, 0.8%-2.5% of Al2O3, 40%-60.0% of CaO, 3.0%-8.0% of MgO, 0-0.8% of S, 0-0.1% of K2O, 0-0.1% of Na2O, 0.1%-1.0% MnO, 0.2%-0.75% of TiO2 and the balance H2O. After the combustion-supporting additive which takes the steel slags as the main raw material and contains all the components is added in combusted pulverized coal, the combustion efficiency of fire coal and the combustion furnace conditions of a blast furnace are both improved.

Description

technical field [0001] The invention relates to the technical field of coal combustion, in particular to a combustion-supporting coal-combustion additive prepared by using converter slag as a raw material and an application method thereof. Background technique [0002] Coke is used in modern blast furnace smelting. Its role in the blast furnace is to provide the heat needed for the smelting process, the reducing agent needed to reduce iron ore, and the skeleton to maintain the air permeability of the blast furnace column. Blast furnace pulverized coal injection is to directly inject pulverized anthracite powder or bituminous coal powder or a mixture of the two from the tuyeres of the blast furnace into the furnace to replace coke to provide heat and reducers, thereby reducing the coke ratio. , to reduce the cost of pig iron, it is a major technological revolution in modern blast furnace smelting. [0003] Now, with the continuous improvement of the coal injection ratio of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10
Inventor 王琳程垚崔广信李兰涛
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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