Metallurgical apparatus – Process
Patent
1976-10-27
1977-09-27
Lake, Roy
Metallurgical apparatus
Process
214 35R, 266 89, 266183, C21B 700
Patent
active
040506797
ABSTRACT:
In a blast furnace installation comprising a blast furnace and a raw material charging apparatus including a hollow inverted frustum shaped rotary hopper mounted above the blast furnace, conveyor means for supplying the raw material to the rotary hopper, a hollow disc shaped impeller located beneath the rotary hopper for receiving the raw material therefrom, stationary inclined chute means including an annular chamber member surrounding the periphery of the impeller for receiving the raw material discharged from the impeller, and an electric motor for driving the impeller, the gas pressure in the furnace top is accurately controlled by detecting the gas pressure in the annular chamber member at a plurality of circumferentially spaced points, comparing the mean value of the detected gas pressure with a preset furnace top gas pressure for producing a control signal proportional to the difference therebetween, and controlling the speed of the motor by the control signal thereby reducing substantially to zero the amount of the gas discharged to the atmosphere from the impeller.
REFERENCES:
patent: 3966062 (1976-06-01), Sakai
Bell Paul A.
Lake Roy
Pfund Charles E.
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