Air separation method and system for producing oxygen to...

B - Operations – Transporting – 01 – D

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B01D 53/22 (2006.01) C01B 13/02 (2006.01)

Patent

CA 2352867

A method and system to separate oxygen from air for producing oxygen to support combustion of a fuel, thereby to produce heat in a heat consuming device. In accordance with the method and system a heated and compressed air stream is introduced into a ceramic membrane system having one or more oxygen-selective, ion conducting membranes to produce an oxygen permeate stream which is used to support combustion of the fuel. The compressed air stream is heated within the heat consuming device itself which can be, for instance, a furnace or a boiler, through indirect heat exchange with flue gases or by radiant heat within a radiant heat exchange zone thereof. An oxygen lean retentate stream, produced through separation of oxygen from the compressed and heated air stream, can be expanded with the performance of work to produce an expanded air stream. The work of expansion can be applied to the compression of the incoming air stream. The expanded air stream can be used to preheat the compressed and heated air stream.

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