Furnaces – Process – Burning pulverized fuel
Patent
1996-11-12
1998-11-03
Lazarus, Ira S.
Furnaces
Process
Burning pulverized fuel
110104B, 110260, 110261, 110262, 110263, 110265, 431 8, 431 9, 431 10, 431181, 431182, 431183, 431184, 431187, F23C 110, F23C 112
Patent
active
058293698
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.
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Kaufman Keith C.
Koslosy John V.
LaRue Albert D.
Rodgers Larry W.
Sarv Hamid
Ciric Ljiljana V.
Edwards Robert J.
Kalka Daniel S.
Lazarus Ira S.
The Babcock & Wilcox Company
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