Super low NO x , high efficiency, compact firetube boiler

Details Super low NO x , high efficiency, compact firetube boiler Super low NO x , high efficiency, compact firetube boiler

2005-12-06

2005-12-06

Wilson, Gregory (Department: 3749)

Liquid heaters and vaporizers

Flue

Horizontal

C122S075000, C122S076000

Reexamination Certificate

active

06971336

ABSTRACT:
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 NOxformation is less than 5 ppmv at 3% O2.

REFERENCES:
patent: 438872 (1890-10-01), Wilson et al.
patent: 4004875 (1977-01-01), Zink et al.
patent: 4147134 (1979-04-01), Vogt et al.
patent: 4195596 (1980-04-01), Scheifley et al.
patent: 4989549 (1991-02-01), Korenberg
patent: 5350293 (1994-09-01), Khinkis et al.
patent: 6289851 (2001-09-01), Rabovitser et al.
patent: 6338337 (2002-01-01), Panz et al.
patent: 6672859 (2004-01-01), Rabovitser et al.

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