NDLI: Computational Analysis of O2 Separating Membrane for a CO2-Emission-Free Power Process

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Selimovic, Faruk Sunde´n, Bengt Assadi, Mohsen Selimovic, Azra
Copyright Year	2004
Abstract	The increased demand for clean power in recent years has led to the development of various processes that include different types of CO2 capture. Several options are possible: pre-combustion concepts (fuel de-carbonization and subsequent combustion of H2), post-combustion concepts (tail-end CO2 capture solutions, such as amine scrubbing), and integrated concepts in which combustion is carried out in pure a O2 or oxygen-enriched environment instead of air. The integrated concepts involve the use of oxygen-, hydrogen-, or CO2-separating membranes resulting in exhaust gas containing CO2 and water, from which CO2 can easily be separated. In contrast to traditional oxygen pumps, where a solid oxide electrolyte is sandwiched between two gas-permeable electrodes, a dense, mixed ionic-electronic conducting membrane (MIECM) shows high potential for oxygen separation without external electrodes attached to the oxide surface. Models for oxygen transport through dense membranes have been reported in numerous recent studies. In this study, an equation for oxygen separation has been integrated into a steady-state heat and mass transfer membrane model. Oxygen transfer through a porous supporting layer of membrane is also taken into account. The developed FORTRAN code has been used for numerical investigation and performance analysis of the MIECM and the oxygen transport potential over a range of operating conditions. Preliminary results indicate that a non-uniform temperature distribution, for a given set of oxygen inlet boundary conditions has considerable impact on the oxygen flux and membrane efficiency. Since the implementation of detailed membrane models in heat and mass balance calculations for system studies would result in excessive calculation time, results from this study will be utilized for the generation of correlations describing the oxygen transfer as a function of operating parameters such as temperature and partial pressure. This modeling approach is expected to improve the accuracy of system studies.
Sponsorship	Heat Transfer Division
Starting Page	9
Ending Page	18
Page Count	10
File Format	PDF
ISBN	079184711X
DOI	10.1115/IMECE2004-59382
Volume Number	Heat Transfer, Volume 2
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Water Membranes Solid oxide fuel cells Temperature Hydrogen Carbon dioxide Combustion Separation (technology) Fuels Modeling Exhaust systems Fortran Electrodes Carbon capture and storage Temperature distribution Oxygen Pressure Steady state Mass transfer Emissions Heat Renewable energy Pumps Boundary-value problems Electrolytes
Content Type	Text
Resource Type	Article

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