Application Note
Using Oxygen Analyzers As A Predictive Maintenance Tool For Air Heaters
The probe-type in situ oxygen analyzer has become an indispensable tool for monitoring combustion process efficiency.
A usual location for mounting an O2 probe in boilers is downstream from the economizer. This location is ideal because it is close to the boiler, but the flue gas temperatures are usually below 1000°F (537°C). Some facilities mount one or more probes downstream from the "air heater". The air heater exchanges the heat from the flue gas to the fresh air used to fire the burners. There is always a possibility that a leak can occur allowing fresh air to infiltrate into the flue gas and reducing the rate of heat transfer and diminishing boiler efficiency. Likewise, the leaked air is not available for combustion, reducing the maximum firing rate of the boiler.
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