pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER NO, PA-115<br />
(Page 245)<br />
X. High Purity Linde Oxygen Making System (MR-IQOO Plants: The<br />
equipment making-up the high purity oxygen making system (99.5<br />
percent pure oxygen) is located in Blow Engine House No. 1 and<br />
just east of the Central Boiler House between Blow Engine House<br />
No. 1 and Blow Engine House No. 2. Located inside of Blow Engine<br />
House No. 1 at its western end is a large two stage Allis-<br />
Chamlers compressor (1st stage axial, 2nd stage centrifugal)<br />
which is driven by a Worthington steam turbine. The first stage<br />
of the air compressor is rated at 125,000 cfm, while the second<br />
stage is rated at 44,400 cfm. The steam turbine is rated at<br />
10,250 hp. Air entered the first stage of the compressor after<br />
passing through a small filter house located in the northwest<br />
corner of the building. Compressed air left the second stage of<br />
the compressor through an approximately 2• diameter pipe that<br />
extends along the eastern wall of the Central Boiler House before<br />
turning into an approximately 10 f diameter x 50* long surge tank<br />
located on the roof of a two story cinder block building, just<br />
east of the various towers used for separating out the<br />
constituent elements of the compressed air. After passing<br />
through the surge tank, which dampens pressure fluctuations in<br />
the system, the air was led to the two reversing heat exchangers<br />
and three nitrogen regenerators located alongside each of the MR-<br />
1000 plant's two fractionating towers. The fractionating towers<br />
are each composed of an upper and lower column separated by a<br />
condenser.<br />
The approximately 20' diameter x 50' high reversing heat<br />
exchangers and nitrogen regenerators were used to cool down the<br />
compressed air to temperatures of -300° F. This was accomplished<br />
in the regenerators by running the incoming air against outgoing<br />
waste nitrogen which deposited moisture, carbon dioxide, and most<br />
of the hydrocarbons as solids in the regenerator packing. That<br />
portion of the compressed air which was directed to the reversing<br />
heat exchangers is cooled against the outgoing oxygen and high<br />
purity nitrogen products respectively. Both the reversing heat<br />
exchangers and the regenerators have side bleed take-off points<br />
which passed about 15 percent of the air through one of two 5'<br />
diameter x 15* high side bleed gel traps located near each<br />
fractionating tower for the removal of any remaining carbon<br />
dioxide and hydrocarbons. The air that left the cold end of the<br />
reversing heat exchangers and the regenerators (about 85 percent<br />
of the total) passed through one of two 5' diameter x 15* high<br />
cold end gel traps located near each fractionating tower for the<br />
same purpose.<br />
Most of the air which left the side bleed gel traps flowed<br />
to one of two expansion turbines (one at each fractionating<br />
tower) where the temperature is lowered by expansion to near the<br />
liquescent point. From the turbines the air was fed to the upper