Method for reducing NOx using atomizing steam injection control

摘要

A method and apparatus for controlling NOx produced by a natural gas fired combustion source includes establishing a control curve for the combustion source for indicating NOx levels based on steam injection rates and fuel flow rates provided to the burners. The atomizing steam injection flow rate provided to the burner is measured as well as the fuel flow rate. A NOx level is determined for the combustion source based on the atomizing steam injection flow rate, the firing rate, and the fuel flow rate. NOx levels are lowered by adding atomized steam to the burners according to the pre-programmed control curve.