A burner having lower emissions and lower unburned fuel losses by implementing a transition zone in a low NOx 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 NOx back towards the oxygen-lean fuel pyrolysis zone for reduction to molecular nitrogen. Alternate embodiments include natural gas and fuel oil firing.
申请公布号
US5829369(A)
申请公布日期
1998.11.03
申请号
US19960747319
申请日期
1996.11.12
申请人
THE BABCOCK & WILCOX COMPANY
发明人
SIVY, JENNIFER L.;RODGERS, LARRY W.;KOSLOSY, JOHN V.;LARUE, ALBERT D.;KAUFMAN, KEITH C.;SARV, HAMID