METHOD FOR CHARGING RAW MATERIAL AT FURNACE COOLING TIME OF BELL BLAST FURNACE

PROBLEM TO BE SOLVED: To prevent the lowering of a stock line at opened tuyere side and to prevent the aggravation of furnace condition and the breakage of equipment caused by blowoff, etc., by opening a few of tuyeres at the furnace cooling time, opening adjacent tuyeres in order and also, using raw material having low heap angle. SOLUTION: At the furnace cooling time of a blast furnace, a few of tuyeres are opened to start the operation. The adjacent tuyeres are opened in order and finally, the whole tuyeres are opened to continue the operation. At this time, as the raw material to be charged, the raw material having low heap angle, such as pellet, is used to prevent the lowering of the stock line. The charge of the raw material 20 is conducted by using a swing hopper 22, etc. Under state of stopping the swing hopper 22, the raw material 20 is received through a charging belt conveyor 21. The swing hopper 22 is swung to a prescribed position and the raw material 20 is shifted to the direction desirable to charge and successively, a bell is opened to charge the raw material to the prescribed position. In this way, the raw material is charged to an arbitrary position in the circular direction in the furnace to prevent the lowering of the stock line.