公开(公告)号：US5829369A

公开(公告)日：1998-11-03

申请号：US747319

申请日：1996-11-12

申请人： Jennifer L. Sivy ,  Larry W. Rodgers ,  John V. Koslosy ,  Albert D. LaRue ,  Keith C. Kaufman ,  Hamid Sarv

发明人： Jennifer L. Sivy ,  Larry W. Rodgers ,  John V. Koslosy ,  Albert D. LaRue ,  Keith C. Kaufman ,  Hamid Sarv

IPC分类号： F23D1/02 ,  F23C1/10 ,  F23C1/12 ,  F23C7/00 ,  F23C7/02 ,  F23D1/00 ,  F23D17/00 ,  F23K3/02

CPC分类号： F23C7/004 ,  F23D1/00 ,  F23C2201/20

摘要： A burner having lower emissions and lower unburned fuel losses by implementing a transition zone in a low NO.sub.x burner. The improved burner includes a pulverized fuel transport nozzle surrounded by the transition zone which shields the central oxygen-lean fuel devolatilization zone from the swirling secondary combustion air. The transition zone acts as a buffer between the primary and the secondary air streams to improve the control of near-burner mixing and flame stability by providing limited recirculation regions between primary and secondary air streams. These limited recirculation regions transport evolved NO.sub.x back towards the oxygen-lean fuel pyrolysis zone for reduction to molecular nitrogen. Alternate embodiments include natural gas and fuel oil firing.

摘要翻译： 燃烧器通过在低NOx燃烧器中实现过渡区域而具有较低的排放和较低的未燃燃料损失。 改进的燃烧器包括由过渡区围绕的粉碎的燃料输送喷嘴，其将中心贫氧燃料脱挥发分区域与涡流二次燃烧空气进行屏蔽。 过渡区域充当初级和次级空气流之间的缓冲区，以通过在一级和二级空气流之间提供有限的再循环区域来改善近燃烧器混合和火焰稳定性的控制。 这些有限的再循环区将逸出的NOx转移回贫氧燃料热解区，以还原成分子氮。 替代实施例包括天然气和燃料油燃烧。