Patent ID: 6247917
Filing Date: 2001-06-19
Classification: F23C,F23N

Abstract:
A passive flue gas recirculation system, for use with a combustion generator, for providing a selected percentage of flue gas recirculation, comprising:an exhaust stack for exhausting flue gas from the combustion generator, said exhaust stack having a stack inlet coupled to the combustion generator and a take off point;a recirculation line having a recirculation inlet and a recirculation outlet, wherein said recirculation inlet is coupled to said take off point; andan air inlet line for providing air to the combustion generator, wherein said recirculation outlet is coupled to said air inlet line at a combination point, said air inlet line is sized relative to said recirculation line such that the air inlet pressure drop plus the exhaust stack pressure drop equals the recirculation line pressure drop, thereby passively maintaining the selected percentage of flue gas recirculation to achieve a corresponding reduction in NOx emission.