Re-oriented over fire air ports for reduction of NO x...

Details Re-oriented over fire air ports for reduction of NO x... Re-oriented over fire air ports for reduction of NO x...

2004-01-29

2009-12-01

Lu, Jiping (Department: 3743)

Liquid heaters and vaporizers

Miscellaneous

C122S00700A, C110S251000, C110S265000

Reexamination Certificate

active

07624707

ABSTRACT:
An over fire air (OFA) port arrangement for a pulverized coal-fired boiler or furnace has at least one OFA port through each of the sidewalls for injecting OFA to increase residence time for each burner level. Plural OFA ports may be employed, staggered both vertically and horizontally to effectively deliver over fire air to the burner flames at the appropriate time and location to most efficiently reduce the formation of fuel NOx. OFA port configurations for both single-wall and opposed-wall fired furnaces and boilers are provided.

REFERENCES:
patent: 3048131 (1962-08-01), Hardgrove
patent: 5205226 (1993-04-01), Kitto, Jr. et al.
patent: 5329866 (1994-07-01), LaRue
patent: 5809913 (1998-09-01), Kramer et al.
patent: 6230664 (2001-05-01), Janka et al.
Steam/its generation and use, 40th Ed., Stultz & Kitto, Eds., © 1992 The Babcock & Wilcox Company, Chapter 13, pp. 13-6 to 13-11.

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