<4. Applications>
4-16
TI 11M12A01-01EAll Right Reserved Copyright © 2004, Yokogawa Electric Corporation
Mar. 14, 2017-00
(2) Power generation boiler window box
In large boilers such as those for power generation, part of the combustion exhaust gas is
recycled 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
2
.
Sample point System type Detector Objective
Window box L2, L3 D1 (Note) O
2
, control alarm
Note: The ZO21DW (terminal box explosion-proof type detector; pressure compensated type) or the ZR22G (pressure
compensated type) will be used. These are many cases in which the AV550G averaging converter will be used.
Heavy Oil
Gas
Forced Draft Fan
Air Preheater
Electric Precipitator
Fuel Pump
Feedwater
Economizer
Reheater
Water drum
Steam drum
To water drum
Steam
To turbine
Window Box
Power generation boiler window box
Gas temperature: Max. 550°C
Gas pressure: −5 to 20 kPa
F0416.ai
Gas Recycle Fan
Combustion Exhaust Gas
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