NO_x Emissions From Industrial Boilers: Potential Control Methods

Future regulations may limit emissions of NO_x from industrial/commercial boilers as well as utility boilers. The potential methods of control for these boilers are the same as those for utility boilers—low excess air, flue gas recycle, and two stage combustion. Low excess air and flue gas recycle can control NO_x from thermal fixation. Two stage combustion controls both thermal and fuel NO_x. Further development work is needed to apply these combustion modification procedures to industrial/commercial boilers in which volumetric heat release rate is normally quite high.