Coproduction of Power, Steam, and Oxygen in Coal or Low Quality Fuel Combustion Systems
Publication Date: 2003-Sep-11
The IP.com Prior Art Database
Oxygen can be recovered from air at high temperatures by passing hot compressed oxygen-containing gas, preferably air, at temperatures above 500oC over a selectively permeable solid ceramic membrane containing selected inorganic oxide compounds. These membranes, known in the art generically as ion transport membranes, utilize a voltage or pressure differential across the membrane which causes oxygen ions to migrate through the membrane. The ions recombine to form oxygen gas and electrons, and the electrons move through the membrane in a direction opposite to the oxygen flux. Membranes which operate under a pressure differential typically are defined as mixed conductor membranes. Membranes can be fabricated as tubes or flat plates which are arranged in modules for efficient contacting with 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 High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules.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.