ANALYSIS AND CONTROL OF ABNORMAL CONDITION OF 1 250 m3 BLAST FURNACE
The causes of abnormal furnace condition of Luoyuan Minguang 1 250 m3blast furnace are analyzed,and the process and effect of furnace condition restoration are summarized.It is considered that the blast furnace is characterized by frequent adjustment of capacity by adding or subtracting air,high rate of slow air,poor quality of coke purchased from abroad,high fluctuation of basicity and ferrous iron in sinter,high content of Al2O3,high content of lead and zinc in blast furnace and low discharge rate,as a result,the hearth of blast furnace is not active and accumulates,and then it is difficult to resume the abnormal furnace condition,low output,high consumption and frequent burning of small sleeves.By improving the quality of coke,stopping the high sulfur coke,reducing the load of zinc,stabilizing the basicity and ferrous content of sinter,reducing the content of Al2O3,adjusting the lower air supply system and blocking the air outlet,to improve the distribution of the initial gas flow in the hearth,to adjust the charging system on the upper hearth,to develop the edge and center gas flow,to ensure the smooth flow,to reduce the basicity of the slag,and to match with the high-dose hot washing of manganese ore and fluorite,the blast furnace condition is gradually recovered,the hearth center temperature is gradually raised to normal level,and all the indexes of the blast furnace are returned to normal.
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