All Rights Reserved. Copyright © 2004, Yokogawa Electric Corporation TI 11M12A01-01E
4-15
4. Applications<Toc> <Ind>
4.6 Non-Combustion Applications
a) Oxygen enrichment facility
Although in most combustion systems air is used as-is, there are cases such as in blast furnaces
in steel plants where the air will be enriched with oxygen gas to raise efficiency. When this is
done, oxygen analyzers are used to monitor the oxygen generation unit (air separator, etc.), and/
or to check the condition of the mixing with the air in later process stages. In these cases, the
oxygen analyzer will be measuring values higher than the concentration of oxygen in the air
(approximately 21%).
T0415.EPS
Sample point
Air-oxygen mixing line
Oxygen supply line
Oxygen compressor outlet
System type
H3 (Note 1)
H3 (Note 1)
Detector
Note 1
Note 1
Objective
Operational monitoring
Operational monitoring
Note 1: Measurement will be done using a sampling system, since all the points are at high pressure.
F0415.EPS
Air
Blast Furnace
Air Compressor
490 kPa
20 kPa
75 to 100%O
2
75 to 100%O
2
420 kPa
Regulator Valve
or Needle Valve
Note 1: Due to the high pressure, measurement will
be done with a sampling type system.
0 to 50%O
2
Air
Blast Furnace
Blower
Oxygen
Generation Unit
(Air Separation
Unit)
Blast Furnace Oxygen Enrichment Example
490 to 780 kPa
Intake Tower
Hot Blast Stove
Oxygen Gas
Compressor
May 31, 2004-00
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