pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 152)<br />
delivery process consisted of its trestle supported suspension<br />
bin system and automatic stockhouse equipment as well as upgraded<br />
charging equipment at the top of the furnace which included a<br />
three bell arrangement. Moreover, the computer controlled system<br />
gave the appearance of independent operation.<br />
The delivery of raw materials to the blast furnace top began<br />
with their transfer in the stockhouse from bins hung from the<br />
steel work of the trestle to two automatic conveying systems<br />
leading to one of two 400 cu. ft. skip cars located in the center<br />
of the furnace's skip pit. The skip pit divided the stockhouse<br />
into two halves, north and south. The equipment located in the<br />
north stockhouse filled the skip car positioned on the northern<br />
most track of the inclined skip bridge. The skip car's southern<br />
counterpart was filled by the equipment of the south stockhouse.<br />
The arrangement of the equipment in each stockhouse represented a<br />
mirror image of each other.<br />
Coke was fed onto one of two 60" motor powered conveyor<br />
belts located in the north or south stockhouse from four 46,000<br />
cu. ft, capacity bins via feeder conveyors which were directly<br />
attached to the coke bins at each of their bottom openings. Each<br />
main coke conveyor belt, traveling toward the skip pit, carried<br />
its material over a 230 ton per hour Hewitt-Robins vibrating<br />
inclined screen where the coke breeze was separated out. The<br />
screen delivered the main charge directly into a 6-ton weigh<br />
hopper which weighed the coke before releasing the proper amount<br />
into a chute leading to its respective skip car. An additional<br />
46,000 cu. ft. coke bin, located directly above each vibrating<br />
screen, was designed to provide the system with coke in case of a<br />
failure with the conveying system.<br />
Fluxing material from two north or south stockhouse 8,000<br />
cu. ft. capacity bins were fed onto each of their own 48" motor<br />
powered conveyors by feeder conveyors attached to their bottom<br />
openings. The material traveled directly to a 30-ton weigh<br />
hopper which weighed it before releasing the proper amount into a<br />
chute leading to a skip car. Pellets from three 6,000 cu. ft.<br />
capacity north or south stockhouse bins were delivered via each<br />
of their own 48" conveyor belts to the waiting skip car in the<br />
same manner as the fluxing material with the exception that an<br />
additional ore bin was located directly above each miscellaneous<br />
weigh hopper in case of conveyor failure. Sinter from each of<br />
two north or south stockhouse 6,000 cu. ft. capacity sinter bins<br />
was transmitted by feeder conveyor over a 22 6 ton per hour<br />
vibrating screen where the sinter fines were separated out. Each<br />
screen delivered the main charge onto a 48" wide motor powered<br />
conveyor belt which delivered it to a sinter weigh hopper where<br />
it was weighed and fed through a chute to a waiting skip car.