Hi Roger,
Even at 75% load, the O2 ex radiant section is approx 10%.
Recently we have made a provision at ID-Fan suction for portable O2 analyser. We are yet to check.
No reply from HTAS in this regard.
I work in a Tosoe designed Steam methane reorming plant.
What is the excess oxygen in such plants (measured in the ex radiant section).
We have about 10% excess oxygen.
There is no provision for inserting portable oxygen analyser also.