The sub- raw materials entry device null in the compressed die

摘要

PURPOSE:To enable charge of auxiliary material into a furnace under pressurized condition by injecting inert gas into an intermediate hopper and pressure vessel and charging the auxiliary material into a furnace with driving of an auxiliary material discharging feeder through an auxiliary charging chute. CONSTITUTION:At first, by opening a cutoff valve 19 in an auxiliary material receiving hole 20, the auxiliary material A is received into the intermediate hopper 18 and the prescribed quantity ie charged and the cutoff valve 19 is closed. Successively, the furnace gas pressure is detected with a furnace gas pressure detecting device 27 and the inert gas is injected into the intermediate hopper 18 and the pressure vessel 21 by opening inert gas passages 28, 29 so that the detected furnace gas pressure is equal to the pressure in the intermediate hopper 18 and the pressure vessel 21. Successively, by opening the cutoff valve 26 on the way of the auxiliary raw material charging chute 24 and driving the auxiliary raw material discharging feeder 22 in the pressure vessel 21, the prescribed quantity of auxiliary raw material A charged in the intermediate hopper 18 is discharged into the auxiliary raw material charging chute 24 and from there, the auxiliary raw material A is charged into the furnace.