Liquid heaters and vaporizers – Steam treatment – Fire tube boiler
Reexamination Certificate
2006-10-03
2009-12-29
Wilson, Gregory A (Department: 3749)
Liquid heaters and vaporizers
Steam treatment
Fire tube boiler
C122S470000, C122S482000
Reexamination Certificate
active
07637233
ABSTRACT:
A control system for maintaining a desired heat exchanger outlet flue gas temperature across a range of boiler loads. The heat exchanger includes a plurality of tubular configurations in heat exchange contact with the flue gas with each tubular configuration having a separate feedwater inlet. Flue gas temperature control is achieved by modulating the feedwater flow rates through the tubular configurations. In a system having two tubular configurations, the overall heat transfer capacity of the heat exchanger may be reduced to maintain the desired heat exchanger outlet flue gas temperature by reducing feedwater flow through one tubular configuration and overflowing the other, while maintaining the total flow of feedwater through the heat exchanger 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.
Albrecht Melvin John
Bloss James S.
Frascello Stephen V.
McGregor Monte J.
Babcock & Wilcox Power Generation Group, Inc.
Marich Eric
Wilson Gregory A
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