Method for treating malfunction of hearth of gasification furnace of European smelting furnace

Abstract

The invention discloses a method for treating malfunction of a hearth of a gasification furnace of an European smelting furnace. A furnace charge structure of a shaft furnace comprises 60%-100% of metallized acid pellets, 0-40% of sinter, 15-26 kg / t of manganese ore and 160 kg / t of small coke nuts; the furnace charge structure of the gasification furnace comprises 150-550 kg / t of coke, 0-200 kg / t of pulverized coal, 100-200 kg / t of sprayed coal, 0-200 kg / t of coke foam, 15-70 kg / t of silica, 250-300 kg / t of granular steel and 0.35 kg / t of fluorite, the furnace charge structure of the shaft furnace is adjusted to be a 100% pellet and manganese ore furnace charge structure in the first stage of treatment, 12 batches of 100% pellets and manganese ore are added in the first stage, and then the furnace charge structures correspond to the silicon-reducing gradient fuel structure of the gasification furnace according to the proportions of 10%, 15%, 30%, 35%, 40% and 40% in sequence. The method is implemented step by step in seven stages; in the first stage of the furnace charge structure of the gasification furnace, a fuel structure of gasification furnace charge column full-coke smelting and vault coal injection is adopted, the wind speed of a tuyere is controlled to be 185-195 m / s, the temperature of a 6-section copper cooling wall and a 7-section copper cooling wall is stabilized to be 43 + / -3 DEG C, and it is guaranteed that the iron notch interval is within 10 minutes; during hot washing, the daily average tapping frequency is about 12, and circulation of molten iron in the hearth is enhanced.

Description

technical field [0001] The invention relates to the field of non-blast furnace metallurgy, in particular to a method for treating the hearth abnormality of the gasification furnace of Ouyeel furnace. Background technique [0002] In order to solve the problems of large investment and heavy pollution in the traditional blast furnace ironmaking method, since the 1970s, a COREX furnace ironmaking method, namely the smelting reduction ironmaking method, has been developed in the world. This ironmaking method directly uses lump coal and a small amount of low-strength coke into the furnace to generate heat for smelting molten iron and reducing gas. [0003] At present, there are five sets of COREX devices in production in the world as follows: the first C2000COREX furnace in Pohang Plant in South Korea, two C2000COREX furnaces in JINDAL Plant in India, one C2000COREX furnace + direct reduction shaft furnace in SALDANHA Plant in South Africa, and Baowu in China Group Bayi Steel Ou...

AI Technical Summary

Problems solved by technology

After the tuyere leaked, the water in the furnace was too much, which made the slag and iron sticky, and the discharge was not smooth, which gradually caused the hearth of the gasifier to work abnormally.

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