B) Power Generation Boiler Window Box - YOKOGAWA ZR22G Technical Information

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b) Power generation boiler window box

In large boilers such as those for power generation, part of the combustion exhaust gas is re-
cycled to the combustion intake, and the oxygen concentration in the recycled gas is monitored
so that it does not drop too low.
The analyzer range will be a partial range that includes the atmospheric oxygen concentration,
such as 15 to 22% O
Note 1:
All Rights Reserved. Copyright © 2004, Yokogawa Electric Corporation
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2
Sample point
Window box
The ZO21DW (terminal box explosionproof type detector; pressure compensated type) or the ZR22G (pressure
compensated type) will be used. These are many cases in which the AV8C averaging converter will be used.
Power generation boiler window box
System type
L2, L3
Temperature: Max. 550°C
Pressure: –5 to 20 kPa
4. Application
Detector Objective
O , control alarm
D1 (Note)
2
TI 11M12A01-01E
4-16
T0416.EPS
F0416.EPS
May 31, 2004-00