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Abstract
The kinetics of NO formation and CO conversion in lean, premixed, hydrocarbon-air flames is discussed in terms of the elementary reactions involved. With the assumption of constant temperature and equilibrium O and OH concentrations, it is shown that simple, analytic solutions for NO and CO as a function of time may be derived. The importance of low temperature in controlling the NO rate is emphasized. Under conditions appropriate to a gas turbine combustor, the results indicate that for an inlet temperature below 600°K and equivalence ratio below 0.6 there should be 0.1-1 sec available for quenching the NO formation by mixing in air. The CO should be essentially all converted to C02 in 5 msec or less in practical cases.
