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Oxygen Ion Transport Membrane Hybrid Cycle for Nitrogen Integrated IGCC Disclosure Number: IPCOM000030762D
Publication Date: 2004-Aug-25
Document File: 3 page(s) / 26K

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Oxygen Ion Transport Membrane Hybrid Cycle for Nitrogen Integrated IGCC

Oxygen can be recovered from air at high temperatures by passing hot, oxygen-containing gas, preferably air, over non-porous, mixed conducting ceramic membranes.  These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen partial pressure differential across the membrane to cause oxygen ions to migrate through the membrane.

Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot compressed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules.  A comprehensive review of ion transport membranes is given by J. D. Wright and R. J. Copeland in Report No. TDA-GRI-90/0303 prepared for the Gas Research Institute, September 1990. 

This idea is an applicaton of Ion Transport membrane technology to a nitrogen integrated IGCC process. Heated air is compressed to the requirements of the ITM oxygen reactor. In the best case, the air is at a pressure that is high enough to send rejected gas to the gas turbine combustor inlet for energy recovery without additional compression.

Oxygen permeating the ITM oxygen unit is compressed and sent to the gasifier, while the

rejected gas stream is split. One stream having a nitrogen content of approximately three times or more than the oxygen from the ITM flows to an ITM Syngas rector fed with natural gas, where all of the oxy...