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Pulverized coal burner

United States Patent

5,829,369
November 3, 1998
View the Complete Patent at the US Patent & Trademark Office
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.
Sivy; Jennifer L. (Alliance, OH), Rodgers; Larry W. (Canton, OH), Koslosy; John V. (Akron, OH), LaRue; Albert D. (Uniontown, OH), Kaufman; Keith C. (Canton, OH), Sarv; Hamid (Canton, OH)
The Babcock & Wilcox Company (New Orleans, LA)
08/ 747,319
November 12, 1996
This invention was made with government support under Contract No. DE-AC22-92PC92160 awarded by the Department of Energy. The government has certain rights in this invention.