| 摘要 |
PURPOSE:To decide the starting time of residual pig discharge accurately by measuring layer top depth in a furnace at every interval of time after ore is charged and operation is stopped, and calculating an index by a specific equation from the total value of said measured value in every certain time, the area of a layer top in the furnace, and the total amount of a blast. CONSTITUTION:In the flowing-down operation of a blast furnace, after ore is charged and operation is stopped, layer top depth in the furnace is measured by a depth measuring rod, etc., at 3-30min intervals, and recorded. The total value (DELTASL) of said measured value in every prescribed time, area (S) of a layer top in the furnace, and the total amount (VB.DELTAt) of the blast are used to calculate the index by equationI. When the index reaches a criterion, residual pig discharge is started. An index (i) as the criterion is calculated by equation II. In the equation II, rhoore is the bulk specific gravity of the ore rhocoke is the bulk density of the coke, and ore is the amount of treated ore; and coke is the amount of treated coke and (o) is an index in the beginning of a blowing down. |
