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Low emission U-fired boiler combustion system

United States Patent

6,058,855
May 9, 2000
View the Complete Patent at the US Patent & Trademark Office
At least one main combustion chamber contains at least one pulverized coal burner. Each pulverized coal burner is operatively arranged for minimizing NO.sub.X production and for maintaining a predetermined operating temperature to liquefy ash within the combustion chamber. The combustion chamber includes a slag drain for removing slag from the combustion chamber. A slag screen is positioned in a generally U-shaped furnace flow pattern. The slag screen is positioned between the combustion chamber and a radiant furnace. The radiant furnace includes a reburning zone for in-furnace No.sub.X reduction. The reburning zone extends between a reburning fuel injection source and at least one overfire air injection port for injecting air.
Ake; Terence (North Brookfield, MA), Beittel; Roderick (Worcester, MA), Lisauskas; Robert A. (Shrewsbury, MA), Reicker; Eric (Barre, MA)
D. B. Riley, Inc. (Worcester, MA)
09/ 119,097
July 20, 1998
This invention was made with Government support under contract No. DE-AC22-92PC92158 awarded by the United States Department of Energy. The United States Government has certain rights in this invention.