Ultrahigh oxygen-enriched low-carbon smelting method

Abstract

The invention discloses an ultrahigh oxygen-enriched low-carbon smelting method, which is mainly characterized in that the oxygen-enriched rate is increased in the operation process of a blast furnace, the oxygen-enriched rate of the blast furnace is 40-50%, the oxygen-enriched rate of a hot blast stove part reaches 15-20%, and the oxygen enters the furnace at the temperature of 900-1000 DEG C, so that the heat brought by the enriched oxygen is increased, and the carbon consumption in the blast furnace can be effectively reduced; while high oxygen enrichment is achieved, high-reducibility coal gas and coke oven gas are blown at the tuyere, the theoretical combustion temperature of the tuyere can be adjusted, a part of high-reducibility coal gas and coke oven gas can serve as heat sources, a large amount of heat is released through combustion, and the purpose of reducing coke consumption is achieved; the condition that the upper part is cold and the lower part is hot under the high oxygen enrichment condition of a traditional blast furnace is avoided, the main component of coke oven gas is hydrogen, hydrogen replaces carbon to participate in the reduction reaction in the furnace, and the carbon reduction effect is achieved; according to the method, the operation of the blast furnace can be stabilized, the productivity is improved by 20%, and the comprehensive consumption of coke is reduced by 10-15%.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to an ultra-high oxygen-enriched and low-carbon smelting method. Background technique [0002] 70% of the energy consumption of iron and steel enterprises is concentrated in the iron-making process, so reducing the carbon consumption in the iron-making process is the main way to realize the reduction of coal in the iron and steel industry. At present, the development of blast furnaces is facing the technical bottleneck of carbon emission reduction. The space for further reduction of fuel consumption of molten iron is very limited, and the enlargement of blast furnaces and the improvement of production efficiency have reached their limits. At present, the fuel consumption of hot metal smelting in blast furnaces is about 550kg per ton of iron. In the context of the national double carbon target, the carbon emission reduction of traditional blast furnaces h...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a super-high oxygen-enriched low-carbon smelting method to solve the temperature distribution in the furnace "cooling at the top and heating at the bottom" proposed in the above background technology, Reduce the direct reduction and increase the proportion of indirect reduction, thereby reducing the problem of large coke consumption in the process