Flue gas reheat apparatus
AssigneeHeat Exchanger Industries, Inc.
InventorDonald F. Warner
Life of this patent
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Abstract
Flue gas is passed through a first heat exchanger, a wet scrubber, and a second heat exchanger. The first heat exchanger supplies heated liquid to the second heat exchanger to reheat the flue gas. The first heat exchanger comprises, and the second heat exchanger ideally comprises, a plurality of fluoroplastic-covered metal tubes extending through a fluoroplastic-lined gas passage.
Claims5
In flue gas treatment apparatus which includes a first heat exchanger connected to receive flue gas and transfer heat from said flue gas to a liquid, a wet scrubber connected to receive flue gas from said first heat exchanger and to mix a scrubbing liquid with said flue gas to scrub the same, and a second heat exchanger connected to receive scrubbed flue gas from said scrubber and to raise the temperature of said scrubbed flue gas, and means to circulate said liquid between said first and second heat exchangers, wherein said first heat exchanger comprises housing means defining a gas passage, and a plurality of tubes extending through said gas passage, said tubes being covered with corrosion protection coverings and said liquid being connected to pass through said tubes, the heat transfer surface areas of said heat exchangers, the circulation of said liquid between said heat exchangers, and the temperatures of flue gas entering said first heat exchanger and exiting from said second heat exchanger being so related that the temperature of that liquid received by said first heat exchanger is below the acid dewpoint of flue gas entering said first heat exchanger, whereby acid is formed in said first heat exchanger.
Dependencies are inferred from the claim text.