JPS5647506A - Controlling raw material charging into blast furnace - Google Patents

Abstract

PURPOSE:To charge into a blast furnace a hopper-stored raw material in accordance with the target number of chute rotation by a method wherein how much the flow-control valve to be opened at the next time is calculated by examining the past information data on the number of chute rotation accumulated at a constant rotational speed, and on the information how widely the same valve be opened at the preceeding time. CONSTITUTION:Hoppers 1, 1' are installed with detectors 11, 11' such as an acoustic detector capable of accurately measuring the time at which a base material is charged. A circumferential location detector 7 is used to detect the number of rotation of the rotary chute 14 during a time interval detected by the detectors 11, 11', and its pulse number is counted by the detector section B. If, for example, the degree of opening of flow control gate valves 2, 2' is to be controlled at a constant rotational speed, then the calculator section B uses the detected B rotational number and a preliminarily set A target rotational number to calculate the error of opening of the flow control valves between the calculated and actual values. The instruction of how much the valve to be opened at the next time is calculated from the above calculation value, the charged amount from the hoppers 1, 1' and the corrected opening degree of the valves 2, 2' at previous time both given from the memory section D, and the previous instruction on the opening degree of the valves.