METHOD FOR CONTROLLING TEMPERATURE DIFFERECE AT BOTTOM OF BLAST FURNACE

摘要

PURPOSE:To control stably the discahrge of pig iron and slag from a blast furnace by definitely expressing the relation among blast conditions, the ratio between ore and coke at the top of the furnace and the temp. difference at the bottom of the furnace in the form of a statistical model so as to estimate a change in the temp. difference at the bottom of the furnace. CONSTITUTION:Thermometers are placed on the upper and lower sides of the central part of the bottom base plate of a blast furnace, and the resulting data on the temp. difference at the bottom of the furnace, data on blast conditions and data on the ratio between ore and coke at the top of the furnace are stored for a fixed period. A model expressing the temp. difference at the bottom of the furnace in relation to blast conditions and conditions of charge at the top of the furnace as operation factors is identified by using the stored data. A change in the temp. difference at the bottom of the furnace with the lapse of time is estimated according to the model, and the kind, extent and period of action to be taken are decided. The temp. difference at the bottom of the furnace is controlled according to the decisions, and pig iron and slag are stably discharged.