Patent ID: 7322818
Filing Date: 2008-01-29
Classification: F23C,F23D,F23N

Abstract:
1. A method for reducing NO x emissions from an industrial furnace having multiple pre-mix staged-air burners, each pre-mix staged-air burner including at least a primary air chamber and a secondary air chamber for supplying a flow of combustion air, at least one flue gas recirculation duct having a first end for receiving flue gas and a second end opening into the primary air chamber, a venturi to combine the fuel gas, flue gas and air, and means to adjust the flow of air to the primary air chamber and the secondary air chamber, the method comprising the steps of: (a) measuring a parameter correlative of combustion air flow for each of the multiple pre-mix staged-air burners; (b) adjusting the flow of combustion air by damping the primary air chamber and the secondary air chamber for each of the multiple pre-mix staged-air burners so that the parameter is within a predetermined tolerance; and (c) repeating steps (a) and (b) for each of the multiple pre-mix staged-air burners so as to reduce the furnace's total NO