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Novel, Spiral, High Temperature Gas to Gas Heat Exchanger

IP.com Disclosure Number: IPCOM000021006D
Publication Date: 2003-Dec-16
Document File: 3 page(s) / 67K

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Novel, Spiral, High Temperature Gas to Gas Heat Exchanger

Oxygen can be recovered from air at high temperatures by passing hot, oxygen-containing gas, preferably air, over non-porous, solid electrolyte ceramic membranes. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an applied voltage 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 feed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules. The oxygen can also be produced by the ITM device at pressures exceeding the feed air pressure. 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 disclosure proposes a unique design for a spiral type of heat exchanger. Typical spiral heat exchangers exchange heat energy between two or more streams (for example, US patent number 5,922,178, High Temperature Gas Separation Apparatus). A key feature of this heat exchanger is the "tail section." This shape results in high efficiency with minimal area and allows the exchanger skin temperature to match the temperature of the surrounding insulation, minimizing thermal losses. In addition, the proposed spiral exchanger serves as a means of partially capturing radiative energy fro...