Multiple pass economizer and method for SCR temperature control

Liquid heaters and vaporizers – Steam treatment – Fire tube boiler

Reexamination Certificate

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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.

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