pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 149)<br />
industry wide design and technological advances. 4 While<br />
maintaining the basic principle of the Neeland process, the<br />
reconstruction improved furnace production by providing for the<br />
removal of fine coke breeze from the system, increasing the speed<br />
of materials handling, adding capacity to the hoist bucket,<br />
enhancing the distribution of iron ore within the hoist bucket,<br />
and by utilizing more efficient hoisting facilities. As a<br />
result, furnace capacity was increased from approximately 600<br />
tons of pig iron per day to 900 tons per day.<br />
Coke bins were removed from the eastern wall of the<br />
stockhouse and a double hopper bin, hung from the steel framework<br />
of the reconstructed coke track on the trestle, was installed<br />
directly over each of the newly constructed hoist bucket pits.<br />
The opening at each hopper, located above and to the north or<br />
south of the hoist bucket pit walls, led the coke directly over a<br />
8'-ll 5/8" x 8»-3 13/16" inclined screen which was used to<br />
separate out coke dust or breeze. The breeze dropped through the<br />
screens into a hopper which led to a chute delivering it to the<br />
coke breeze conveyor. Each conveyor, traveling in a northeast or<br />
southwest direction, deposited its contents into one of the two<br />
coke dust bins per furnace located along the eastern wall of the<br />
stockhouse. An electric powered coke dust larry car removed the<br />
breeze when the coke dust bins became full. 5<br />
Materials handling was improved by replacing the hoist<br />
bucket/flat rail car arrangement for delivery to the hoist<br />
carriage with a system made up of hoist bucket pits, direct coke<br />
charging facilities, electrical rail powered scale cars, and a<br />
rearrangement of the bin system. After the coke passed over the<br />
screens, it dropped into a chute which led directly into the<br />
hoist bucket located in the center of each of the newly<br />
constructed pits. The remaining raw material bins (limestone and<br />
iron ore) were reconstructed over the ore yard wall. The bins,<br />
following the "Baker" suspension system, were hung from the steel<br />
framework of the trestle. Their manually operated openings were<br />
located just inside the wall and above a rail track system set<br />
upon the stockhouse floor. The raw materials from the bins were<br />
discharged into a scale car running along the track system by an<br />
operator who pulled down on the handle of the bin opening thereby<br />
allowing the materials to fall into one of two weigh hoppers<br />
attached to the car. After discharge, the car transported the<br />
materials to the western side of the hoist bucket pit where the<br />
weigh hoppers were pneumatically opened and the contents were<br />
emptied into one of two chutes leading to the hoist bucket. 6<br />
The hoist bucket itself was enlarged to 250 cu. ft. full<br />
capacity and was attached by its stem directly to the hoist<br />
carriage. In order to improve the distribution of the charge