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Super low NO.sub.x, high efficiency, compact firetube boiler

United States Patent

December 6, 2005
View the Complete Patent at the US Patent & Trademark Office
A firetube boiler furnace having two combustion sections and an in-line intermediate tubular heat transfer section between the two combustion sections and integral to the pressure vessel. This design provides a staged oxidant combustion apparatus with separate in-line combustion chambers for fuel-rich primary combustion and fuel-lean secondary combustion and sufficient cooling of the combustion products from the primary combustion such that when the secondary combustion oxidant is added in the secondary combustion stage, the NO.sub.x formation is less than 5 ppmv at 3% O.sub.2.
Chojnacki; Dennis A. (Schaumburg, IL), Rabovitser; Iosif K. (Skokie, IL), Knight; Richard A. (Brookfield, IL), Cygan; David F. (Villa Park, IL), Korenberg; Jacob (York, PA)
Gas Technology Institute (Des Plaines, IL)
11/ 029,946
January 5, 2005
The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC36-00ID13904 awarded by the U.S. Department of Energy.