Parametric sensitivity analysis for a natural gas fueled high temperature tubular solid oxide fuel cell

摘要

For more than the last two decades, there has been research going on to develop advanced energy technologies involving minimum environmental pollution, to replace the conventional fossil energy systems. Solid oxide fuel cells (SOFCs) are one of the most promising, eco-friendly and efficient means for the generation of electricity to meet the future energy requirements. This research work focuses on the parametric sensitivity analysis for natural gas fueled high temperature tubular SOFC. Firstly, for the tubular SOFC, a one-dimensional radially symmetrical model has been developed and solved using the finite-difference method. Then, the effect of the variation of important operational and design parameters on its performance has been analyzed. The parameters typically include composition, inlet fuel temperature, pressure, length of SOFC tube and thicknesses of its components. The composition is expressed as steam to methane ratio and it has been observed that the voltage and power density developed by the SOFC diminishes as the ratio increases. Further, a change in the inlet fuel pressure of the tubular SOFC has no pronounced influence on the voltage and power density developed. On the other hand, with an increase in the inlet fuel temperature, a small improvement in these performance characteristics is exhibited. The axial length of the tubular SOFC does conspicuously influence its performance characteristics but solely at current densities greater than 4000A/m2. An increase in the thickness of its components results in a reduction in its voltage and power density developed. The largest decline in these performance characteristics with the increase in thickness is observed for electrolyte followed by cathode and anode respectively.