Intensification smelting technology in blast furnace at superhigh utilization coefficient

Abstract

The invention relates to a technical project for blast furnace smelting, particularly on the precondition of not increasing smelting device for increasing the foundry iron yield, comprising: (1) large air quantity, reforming D900 draught fan to make the air quantity in air outlet being 750m3, the pressure 310KPa; (2) high air temperature, employing combustion air preheating, automatic boiler, reinforced air heater stove to improve coal gas quality and make sure the dust content in coal gas is below 5mg / m3 ; (3)smelting with less silicon, decreasing the powder content in the furnace-entering ore, increasing the air permeability in the material column, stabilizing the sintered ore proportioning, increasing the quality, alkalinity and intensity of sintered ore gradually, improving the sintered ore reduction, employing sintered ore with low-silicon and low-ferrous iron to control the coke ash content effectively and improve the coke intensity of heat and cold, increasing the press on the top if the furnace, blowing fuel and controlling the theoretical burning temperature in air outlet, and decreasing the furnace temperature gradually on the premise of the condition of furnace is stably proceeded. The invention is characterized by the high ferrous iron yield, low investment and simple process.

Description

(1) Technical field [0001] The invention relates to a blast furnace smelting technical proposal, in particular to increase pig iron output without increasing smelting equipment. (two), background technology [0002] At present, the pig iron output of blast furnace ironmaking in my country is generally low. How to increase the pig iron output without increasing smelting equipment has become the goal of technological transformation of enterprises. (3) Contents of the invention: [0003] The invention provides a technological scheme for intensified smelting under ultra-high utilization coefficient of blast furnace, which not only greatly improves the output of pig iron, but also has less investment and simple process. [0004] The technical solution adopted by the present invention to solve its technical problems is: its technical solution is: ①, transform the D900 blower fan with a large air volume, so that the air volume of the air outlet is 750M 3 , the pressure is 310Kpa...

AI Technical Summary

Problems solved by technology

[0002] At present, the pig iron output of blast furnace ironmaking in my country is generally low. How to increase the pig iron output without increasing smelting equipment has become the goal of technological transformation of enterprises.