METHOD AND APPARATUS FOR REGULATING GAS FLOW FOR PRE-REDUCTION IN SMELTING REDUCTION EQUIPMENT PROVIDING PRE-REDUCTION FURNACE

摘要

PURPOSE:To keep ore under suitable fluidized condition and to enable suitable pre- reduction by varying gas pressure for introducing into a pre-reduction furnace and regulating the actual flow rate. CONSTITUTION:A flow detector 18 outputs gas flow rate passing through a duct 11 to a computing control unit 20. The computing control unit 20 calculates the suitable pressure, which is outputted to a comparison adjusting device 21 and also opening degree regulating signal decided with calculation is transmitted to a damper 17 to regulate the opening degree. The pressure at the inlet of the pre-reduction furnace 2 is detected with a pressure detector 19 and this is outputted to the comparison adjusting device 21. The comparison adjusting device 21 compares this pressure signal and the pressure signal from the computing control unit 20 and the opening degree regulating signal is transmitted to the damper 16 so that the actual pressure approaches the suitable pressure to regulate the opening degree. By this method, for the variations of gas pressure and flow rate generated in the smelting reduction furnace, the fluidity in pre-reduction furnace 2 is kept under the suitable condition, thereby smooth operation of the furnace is made possible.