Technical progress in operation of maanshan steel's 2500 m3 blast furnace
After the 2500 m3 blast furnace of Maanshan Iron and Steel Co.was opened,the furnace condition fluctua-ted or even became abnormal to varying degrees,and the productivity and indicators were difficult to break through significantly.Through exploration,the technical team gradually transforms their inherent operational concepts and actively adapts to external raw material and fuel conditions;Correct misconceptions regarding the use of air volume and high titanium iron,maintain the blowing kinetic energy at 130～135 kJ/s,control the iron[Ti]below 0.080％,and control the[Ti]+[Si]around 0.45％～0.55％;Guide the balance of attack and defense in the blast furnace based on the state of the furnace hearth.When there is a decline in the condition of the furnace,it is necessary to re-treat appropriately,strengthen the quality management of raw materials,and prioritize the treatment of slag and i-ron;During the recovery process of the furnace hearth,seize the opportunity to quickly adjust the upper material system,so that the blast furnace can enter the expected state as quickly as possible and strengthen smelting;A set of upper system adjustment methods has been formed to regulate and stabilize the central airflow by controlling the amount of coke added to the center,and to control the strength of the edge airflow by controlling the edge ore coke load,platform angle,and material line,forming a stable distribution of two airflow channels.With this,we have successfully overcome a series of peripheral adverse factors,maintained stable and smooth furnace conditions,and achieved good technical and economic indicators.
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