Method for utilizing coke breeze for blast furnace injection

Abstract

The invention discloses a method for utilizing coke breeze for blast furnace injection, and belongs to the field of metallurgy. The method comprises the following steps that the coke breeze with particle size less than 3.0 mm and moisture less than 12% and blast furnace injection anthracite are blended and mixed, then dried through a pulverizing link of a coal injection system, and milled by a mill, finally the mixed fuel with the particle size of 200 meshes accounting for 60% or above is used as blast furnace injection fuel, and the mixed fuel is conveyed to a blast furnace through a powder conveying system and is injected into the furnace for combustion and smelting reaction.According to the method, the coke breeze is used as part of injection anthracite or lump coke, the fuel structure of ferrous metallurgy enterprises is optimized, on one hand, the use amount of the sintered coke breeze is reduced, and the particle size of the sintered fuel is improved;on the other hand, after the use amount of the sintered coke breeze is reduced, the consumption of low-price anthracite can be increased, and the fuel cost is reduced; and meanwhile, natural resource allocation is optimized, the resource utilization rate of the sintered anthracite is increased, and sustainable development is achieved.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for utilizing powdered coke by iron and steel metallurgical enterprises. Background technique [0002] Modern iron and steel complexes generally have coking processes, sintering and pelletizing processes, and iron-making processes. These processes are generally assigned to the operation and management of the iron-making plant. The metallurgical coke required by the blast furnace is mainly produced by the coking process. In the coking process, a large amount of powder coke is produced during coke pushing, cooling, conveying, coke cutting, and screening, and a large amount of powder coke is also produced during sieving under the blast furnace ditch. Lump coke > 20 mm is used as the main fuel for smelting in blast furnaces, and small coke pieces and diced cokes of 20-8 mm can be smelted in blast furnaces without, partly or entirely, but this part of coke has certain market chan...

AI Technical Summary

Problems solved by technology

[0003] In the small coke and coke powder <8mm, about half of the coke powder <3mm is contained. This part of the coke powder is over-pulverized in the secondary crushing process of the sintered fuel, so that the particle size of the sintered fuel contains a large amount of <0.5mm or < 1mm fine-grained fuel, this kind of fuel is not conducive to sintering, the combustion speed is fast, the heat generated is quickly taken away by the exhaust gas, it is difficult to generate enough heat and high temperature to meet the needs of sintering