| 摘要 |
PURPOSE:To control the thickness ratio distribution of the ore/coke layers in a blast furnace and to stabilize blast furnace operation by detecting the raw material layer thickness in the diametral direction of the furnace owing to the collapse of the raw material layer charged into the furnace and feeding the same back to a raw material charger. CONSTITUTION:A bell 1 is lowered in a blast furnace having a bell type raw material charger and coke 2 which is a reducing agent and iron ore 3 are charged alternately in a laminar state into the blast furnace. The coke near the furnace wall part is chipped by the ore 3 falling by striking against the furnace wall as the iron ore 3 charged thereafter into the furnace falls, thus the coke layer 2 moves along the sliding line 5 toward the central part of the furnace. The thickness of the coke layer in the inside diametral direction of the furnace changes accordingly and the distribution in the thickness ratio of the ore-coke layers changes. The flow rate of the gas ascending in the furnace changes in the inside diametral direction, thus making the furnace condition unstable. Such change in the coke layer is fed back to the raw material charger and the raw materials are charged in a way as to maintain the specified thickness ratio distribution of the ore-coke layer in the furnace, by which the furnace condition is stabilized. |
