Additive amount method of low-rank coal in blast furnace injection coal

Abstract

The invention discloses an additive amount method of low-rank coal in blast furnace injection coal. The method is characterized by comprising the steps of grinding the low-rank coal by a coal mill to obtain the pulverized coal of the low-rank coal, wherein the weight of the pulverized coal with the particle size of less than or equal to 100 meshes in the low-rank coal accounts for 38.05-93.74% of the total weight of the pulverized coal of the low-rank coal; grinding high-rank coal by the coal mill to obtain the pulverized coal of the high-rank coal; and mixing the pulverized coal of the low-rank coal and the pulverized coal of the high-rank coal to obtain the blast furnace injection coal. According to the method, the limitation for the particle size of the low-rank coal is broadened in the pulverizing process, and the content of the pulverized coal with the particle size of less than or equal to 100-meshe aperture in the low-rank coal is increased, so that the explosiveness of the pulverized coal is reduced, the safety requirement for the blast furnace injection coal is reached, and the coal blending ratio of the high-rank coal and the low-rank coal is increased. Therefore, the consumption of the low-rank coal which is taken as the blast furnace injection coal can be increased, the production cost of iron and steel enterprises is greatly lowered, and the economic benefit of the enterprises can be improved.

Description

technical field [0001] The invention relates to the related technical field of coal blending, in particular to a method for blending low-rank coal into blast furnace injection coal. Background technique [0002] Blast furnace fuel injection is a new technology widely used in modern blast furnace ironmaking production, and it is one of the indispensable and important means for modern blast furnace condition adjustment. Fuel injection in blast furnace is beneficial to reduce coke ratio, reduce pig iron cost, improve blast furnace smelting process, and further improve various technical and economic indicators of blast furnace. [0003] Blast furnace injection has certain requirements on the quality of coal. Coal should have low ash and sulfur content, high calorific value, good grindability, combustibility, and transportation performance, low explosiveness, and good reactivity. For a long time, my country's blast furnace coal injection generally uses anthracite. But after mo...

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Problems solved by technology

[0009] Based on this, it is necessary to provide a method for blending low-rank coal into blast furnace PCI coal in view of the technical problem of low-rank coal blending ratio in blast furnace PCI coal in the prior art

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