Steam generating system with NO.sub.x reduction

Details Steam generating system with NO.sub.x reduction Steam generating system with NO.sub.x reduction

1990-11-15

1991-08-20

Yuen, Henry C.

Furnaces

Combined

With boiler

110188, 110204, 432 72, 432222, 1221351, F23B 700

Patent

active

050404709

ABSTRACT:
A method and system for flue gas recirculation is disclosed which will minimize NOx production from hydrocarbon combustion. In the present invention a furnace having an oxygen-bearing primary source of combustion air, a mixing chamber, a combustion chamber in downstream communication with the mixing chamber and an exhaust section downstream of the combustion chamber is provided with a flue gas recirculation line. The recirculation line establishes communication between the exhaust section and the mixing chamber for the return of combustion products as a secondary source of combustion air which is relatively lean in oxygen and is combined with the primary source of combustion air in the mixing chamber. The ratio of flow rates for the primary and secondary sources of combustion air is controlled by a signal generated by a sensor which senses the oxygen concentration in the mixing chamber.

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