![]() In early tests, although complete oxidation of the residual CO and H2 in the simulated SOFC depleted fuel was achieved, membrane performance degraded over time. The ceramic tubes are sealed into high temperature metallic housings which precludes mixing of the simulated SOFC depleted fuel and air streams. A number of experiments have been carried out in which simulated SOFC depleted fuel gas compositions and air have been supplied to either side of single OTM tubes in laboratory-scale reactors. ![]() This permeated oxygen subsequently combusts the residual fuel in the SOFC exhaust. In the SOFC afterburner application the chemical potential difference between the high temperature SOFC depleted fuel gas and the supplied air provides the driving force for oxygen transport. The oxygen separation membranes find applications in syngas production, high purity oxygen production and gas purification. Praxair has been developing oxygen separation systems based on dense walled, mixed electronic, oxygen ion conducting ceramics for a number of years. That CO2 can then be compressed and sequestered, resulting in a Zero Emission power generation system operating on hydrocarbon fuel that adds only water vapor to the environment. The water vapor is then condensed from the totally 1.5.DOC oxidized fuel stream exiting the afterburner, leaving only the CO2 in gaseous form. The OTM will selectively transport oxygen across the membrane to oxidize the remaining H2 and CO. The OTM is supplied air and the depleted fuel. That anode gas, the depleted fuel stream, containing less than 18% (H2 + CO), will be directed to an Oxygen Transport Membrane (OTM) Afterburner that is being developed by Praxair, Inc. To accomplish this, SWPC is developing a SOFC module design, to be demonstrated in operating hardware, that will maintain separation of the fuel cell anode gas, consisting of H2, CO, H2O and CO2, from the vitiated air. This forward looking DOE sponsored Vision 21 program is supporting the development of methods to capture and sequester the CO2, resulting in a Zero Emission power generation system. The byproducts of the power generation from hydrocarbon fuels that are released into the environment are CO2 and water vapor. Therefore the NOx and SOx emissions for the SOFC power generation system are near negligible. ![]() Within the SOFC module the desulfurized fuel is utilized electrochemically and oxidized below the temperature for NOx generation. Because the system operates with a relatively high electrical efficiency, the CO2 emissions, 1.0 lb CO2/ kW-hr, are low. The SWPC SOFC power systems are equipped to operate on lower number hydrocarbon fuels such as pipeline natural gas, which is desulfurized within the SOFC power system. It will generate electrical power at greater than 45% electrical efficiency. SWPC will soon deploy the first unit of a newly developed 250 kWe Combined Heat Power System. SWPC has combined DOE Developmental funds with commercial customer funding to establish a record of successful SOFC field demonstration power systems of increasing size. (SWPC) is engaged in the development of Solid Oxide Fuel Cell stationary power systems.
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