Liquid heaters and vaporizers – Steam treatment – Superheater
Reexamination Certificate
2006-12-05
2009-06-23
McAllister, Steven B (Department: 3749)
Liquid heaters and vaporizers
Steam treatment
Superheater
C122S00700A, C122S460000, C122S465000
Reexamination Certificate
active
07549400
ABSTRACT:
A method of heating process streams fed to a boiler incorporating an oxygen transport membrane device that includes an oxygen-containing stream and a boiler feed water stream. The membrane device separates oxygen to support combustion of a fuel and generate heat to raise the steam. Heat is recovered and process streams are heated by separately heating portions of the oxygen-containing stream and the boiler feed water stream with a retentate stream produced from the oxygen separation and a flue gas stream generated from the combustion. The flow rate of the portion of the oxygen-containing stream heated by the retentate stream is greater than that heated by the flue gas stream to help minimize heat transfer area and thus, fabrication costs. Also, water is condensed from the flue gas stream during the heat exchange involved in the heat recovery to increase thermodynamic efficiency.
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Ahmed M. Mushtaq
Chakravarthy Vijayaraghavan Srinivasan
van Hassel Bart A.
McAllister Steven B
Praxair Technology Inc.
Rosenblum David M.
Thomas Robert E
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