Split pass economizer bank with integrated water coil air heating and feedwater biasing
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United States of America Patent
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Feb 5, 2019
Grant Date -
Aug 1, 2013
app pub date -
Jan 30, 2013
filing date -
Feb 1, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus for using a water coil air heater with a single bank economizer. A boiler economizer arrangement includes an economizer bank which has separate hot pass bank and cold pass bank economizer portions in a parallel arrangement, each facing the same flow of hot flue gas. Feedwater enters the cold pass bank economizer where it is heated by the hot flue gas, and then flows to a water coil air heater away from the hot flue gas. The feedwater dissipates heat energy in the water coil air heater which may be used to heat air bound for combustion. The feedwater continues into the hot pass bank economizer portion of the economizer arrangement where it absorbs additional heat from the flue gas. The heated feedwater flows out of the economizer arrangement and may be subject to additional heating by a boiler or other heat exchanger.
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