Results of an investigation into the levels of oxides of nitrogen in Westinghouse gas turbine exhausts are presented. Various methods of controlling the amounts of these emissions were considered. The oxides of nitrogen were reduced most effectively by lowering the maximum flame temperature. This was done by either leaning the primary zone of the combustor, by water injection in the primary zone, or by using vitiated combustion air. Reductions in NOx levels to 15 percent of original values were achieved.

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