Estimation method of depositional shape of charged material inside blast furnace and replacement method of coke inside blast furnace

Abstract

An estimation method of the depositional shape of a charged material inside a blast furnace formed after coke inside the blast furnace is consumed by using a burner when the blast furnace is caused to start up. The estimation method includes estimating the depositional shape of a charged material inside a blast furnace in a blowing down with lowering stock level, estimating a charged region of coke inside the blast furnace from the estimated depositional shape of the charged material inside the blast furnace and from the shape of a solidified layer on a bottom part inside the blast furnace, estimating an amount of coke inside the blast furnace that is consumed by using the burner, and estimating, from the estimated amount of the coke inside the blast furnace, the depositional shape of a charged material inside the blast furnace formed after consumption of the coke inside the blast furnace.

1 . An estimation method of a depositional shape of a charged material inside a blast furnace for estimating, when a blast furnace in a blowing down with lowering stock level is caused to start up, a depositional shape of a charged material inside the blast furnace formed after a burner is inserted into the blast furnace through a tap hole of the blast furnace and is used to consume coke inside the blast furnace, the estimation method comprising:
 estimating a depositional shape of a charged material inside a blast furnace in a blowing down with lowering stock level;   estimating a charged region of coke inside the blast furnace from the estimated depositional shape of the charged material inside the blast furnace and from a shape of a solidified layer on a bottom part inside the blast furnace;   estimating an amount of coke inside the blast furnace that is consumed by using the burner; and   estimating, from the estimated amount of the coke inside the blast furnace, a depositional shape of a charged material inside the blast furnace formed after consumption of the coke inside the blast furnace.   
     
     
         2 . A replacement method of coke inside a blast furnace using the estimation method of the depositional shape of the charged material inside the blast furnace according to  claim 1 , the replacement method comprising:
 charging the coke into the blast furnace so as to reduce a change between the depositional shape of the charged material inside the blast furnace in the blowing down with lowering stock level and the depositional shape of the charged material inside the blast furnace formed after the consumption of the coke inside the blast furnace.