| 摘要 |
PURPOSE:To reduce NOx in exhaust gas by a method wherein a preliminary combustion zone, equipped with a nozzle for primary fuel, in which fuel and air for stabilized combustion are supplied at the upstream side thereof, and a nozzle for secondary duel, in which only the fuel is supplied at the downstream side thereof, is provided in a duct casing by defining it while the downstream end of this zone is joined with an exhaust gas flow path in the duct casing to effect tertiary combustion. CONSTITUTION:Exhaust gas 2 is made to flow into a duct casing 1 and fuel is supplied by dividing it for a nozzle 4 for primary fuel and the nozzle 11 for secondary fuel respectively while air 6 for stabilized combustion is supplied only to the nozzle 4 for primary fuel to obtain high-temperature gas including the small amount of NOx. Further, the exhaust gas 2 is burnt by the high- temperature gas 16 to rise the temperature thereof. NOx in high-temperature exhaust gas, passing through the duct burner, may be reduced by this three stage combustion method.
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