METHOD FOR ESTIMATING ALLOWABLE BLOWING DOWN TIME IN BLAST FURNACE

摘要

PURPOSE: A method is provided to accurately estimate an allowable blowing down time which is changed according to conditions inside a blast furnace by inserting a tuyere probe into the blast furnace through a tuyere during air blowing down of a blast furnace so as to measure a temperature inside the blast furnace, and estimating a temperature variation of molten materials based on the measured temperature inside the blast furnace. CONSTITUTION: The method for estimating allowable blowing down time in a blast furnace comprises the steps of deducing the change of a temperature inside a blast furnace depending on lapse of time after stopping of air blowing by measuring the temperature inside the blast furnace in a certain time interval using a tuyere probe after blowing down (S1,S2); calculating a distance from the tuyere to molten material in the blast furnace during blowing down period (S3); calculating the surface temperature of the molten material according to the lapse of time after blowing down using the temperature change inside the furnace (S4); and estimating the time that is taken to reach to a temperature in which the molten material starts to be hardened from the change of the surface temperature of molten material as an allowable blowing down time (S5).