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Regardless of your final objective, the use of separated overfire air (SOFA) systems remain the most cost effective way to reduce boiler outlet NOx.
On wall fired boilers, when coupled with low NOx burners, SOFA systems generally provide an additional 20% drop in NOx, with overall reductions in NOx being greater than 50% from baseline. On tangential boilers a well designed SOFA system, when coupled with a re-sized main windbox, will deliver up to a 70% reduction in boiler exit NOx.
On a pound for pound basis, these systems are normally about 10 times more cost effective than other systems and even provide the benefit of reducing the capital and operating costs of catalytic reactors when used in tandem.