Jennifer L Sivy

US Patent:

58293698, Nov 3, 1998

Filed:

Nov 12, 1996

Appl. No.:

8/747319

Inventors:

Jennifer L. Sivy - Alliance OH
Larry W. Rodgers - Canton OH
Albert D. LaRue - Uniontown OH
Keith C. Kaufman - Canton OH
Hamid Sarv - Canton OH

Assignee:

The Babcock & Wilcox Company - New Orleans LA

International Classification:

F23C 110
F23C 112

US Classification:

110347

Abstract:

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.