Liquid heaters and vaporizers – Steam treatment – Fire tube boiler
Reexamination Certificate
2006-05-09
2009-08-25
McAllister, Steven B (Department: 3749)
Liquid heaters and vaporizers
Steam treatment
Fire tube boiler
C122S470000, C122S482000
Reexamination Certificate
active
07578265
ABSTRACT:
A gas temperature control system for maintaining a desired economizer outlet gas temperature across a range of boiler loads comprises a plurality of tubular configurations having surfaces that are in contact with the flue gas. Each tubular configuration, preferably, comprises a plurality of serpentine or stringer tubes arranged horizontally or vertically back and forth within the economizer, and each tubular configuration having a separate feedwater inlet. Heat transfer from the flue gas is accomplished by controlling the feedwater flow rates through the tubular configurations. In a temperature control system having two tubular configurations, the overall heat transfer capacity of the economizer may be reduced to maintain the desired economizer outlet gas temperature during low boiler loads by reducing feedwater flow through one tubular configuration and by overflowing the other tubular configuration, such that total flow of feedwater through the economizer is maintained substantially constant.
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Chapter 34 of STEAM/its generation and use, 41st Ed., Kitto and Stultz, Eds., Copyright 2005, The Babcock & Wilcox Company, Barberton, Ohio, USA, pp. 34-1 through 34-15.
Nischt et al., “Recent SCR Retrofit Experience on Coal-Fired Boilers,” Power-Gen International 1999, Nov. 30-Dec. 2, 1999, New Orleans, LA, Fig. 4, pp. 1-11.
Babcock & Wilcox Power Generation Group, Inc.
Marich Eric
McAllister Steven B
Thomas Robert E
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