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    • 6. 发明授权
    • Flue gas recirculation system for fire tube boilers and burner therefor
    • 用于消防管锅炉及其燃烧器的烟气再循环系统
    • US4659305A
    • 1987-04-21
    • US814901
    • 1985-12-30
    • Peter K. NelsonElroy M. Rulseh
    • Peter K. NelsonElroy M. Rulseh
    • F23C9/08F23M3/00
    • F23C9/08
    • A flue gas recirculation system for fire tube boilers includes a duct connected to the boiler gas discharge stack and to a fan. Another duct couples the fan to a specially designed burner in the boiler. Recirculated flue gas is injected downstream of the fuel/air mixture in the burner and cools the flame leading to substantially reduce the NO.sub.x content in the boiler stack emissions. The burner includes conventional damper and air diffuser systems and a plurality of openings near the inner end of the burner housing, through which the boiler fuel is admitted and mixed with the air. A plurality of slots are formed at the outlet end of the burner, the slots being coupled to an annular chamber surrounding the burner. The duct from the recirculation fan is coupled to such annular chamber. Recirculation of between about fifteen to twenty percent of the flue gas in the above-described device can result in NO.sub.x reductions of more than sixty percent, when compared to a similar boiler operating without such flue gas recirculation.
    • 用于火管锅炉的烟道气再循环系统包括连接到锅炉气体排放堆和与风扇相连的管道。 另一个管道将风扇连接到锅炉中专门设计的燃烧器。 再循环的烟气在燃烧器的燃料/空气混合物的下游被注入并冷却火焰,导致大大降低锅炉排放物中的NOx含量。 燃烧器包括常规的阻尼器和空气扩散器系统和靠近燃烧器壳体的内端的多个开口,锅炉燃料通过该开口进入并与空气混合。 在燃烧器的出口端处形成多个槽,该槽与围绕燃烧器的环形室联接。 来自再循环风扇的管道联接到这种环形室。 与在没有这种烟道气循环的情况下操作的类似锅炉相比,在上述装置中,约15%至20%的烟道气之间的再循环可以导致NOx减少超过百分之六十。