Discussion
Which change would NOT reduce thermal nitrogen oxide formation?
Answer: D
Correct answer: Raising the peak flame temperature
Raising the peak flame temperature increases thermal NOx rather than reducing it. The Zeldovich mechanism has a high activation energy, so its rate climbs steeply above about 1300 degrees Celsius - temperature is the single most powerful variable.
The other three all lower that peak. Staged combustion avoids any zone running at the stoichiometric maximum, flue gas recirculation dilutes the charge with inert products that absorb heat, and reducing excess air within safe limits lowers the flame temperature while still ensuring complete combustion.
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