Regulating overfire air in a boiler using an overfire air tube damper
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United States of America Patent
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May 15, 2012
Grant Date -
Jun 10, 2010
app pub date -
Feb 23, 2010
filing date -
May 16, 2007
priority date (Note) -
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Abstract
A method to regulate overfire air passing through an overfire air duct and entering a flue gas stream in a combustion system including: directing overfire air into an inlet of the overfire air duct, passing the overfire air through the duct and discharging the overfire air into the flue gas stream in the combustion system; adjusting a flow rate of overfire air entering the inlet using a damper adjacent the inlet, and moving the damper parallel along an axis of the overfire air duct to increase and decrease the overfire air entering the inlet, wherein the damper has an open position at which the damper is extended out of the inlet and a closed position in which the damper is substantially in the inlet and blocking air entering the inlet.
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