Non-Combustion Applications; Oxygen Enrichment Facility - YOKOGAWA EXAxt ZR22G Technical Information

4.6

Non-Combustion Applications

(1)

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%).
Sample point
Oxygen supply line
Oxygen compressor outlet
Air-oxygen mixing line
Note 1: Measurement will be done using a sampling system, since all the points are at high pressure.
Note 2: The high-temperature detector should be used.
Air
Intake Tower
Air Compressor
Oxygen
Generation Unit
(Air Separation
Unit)
Blast Furnace Oxygen Enrichment Example
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System type
H3 (Note 1)
H3 (Note 1)
75 to 100%O
2
20 kPa
Oxygen Gas
Compressor
490 kPa
Detector
Note 2
Note 2
75 to 100%O
2
490 to 780 kPa
Blast Furnace
Blower
Air
420 kPa
Note 1: Due to the high pressure, measurement will
<4. Applications>
Objective
Operational monitoring
Operational monitoring
Blast Furnace
Hot Blast Stove
0 to 50%O
2
be done with a sampling type system.
Reducing Valve
or Needle Valve
TI 11M12A01-01E
4-15
F0415.ai
Mar. 14, 2017-00