Investigation of SOFC operation with steam gasifier product gasesas a basis for enhancing ist performance

Abstract

Solid oxide fuel cells (SOFC) represent a promising technology to increase the electrical efficiency of biomass-based combined-heat-power systems in comparison to state-of-the-art gas engines, additionally providing high temperature heat. To identify favorable gas compositions and operating conditions for an efficient coupling with gasifiers at low degradation risk is of major importance to ensure stability, reliability and durability of the systems used. Therefore, this study presents a comprehensive analysis on the influence of main gas components on the performance of an industrial-size SOFC relevant for the use with product gases from biomass gasification. Recommendations for concentrations of H2O, CO, CH4 and CO2 in a H2+N2 gas mixture for enhancing cell performance are presented. Moreover, the degradation stability of a loaded cell fueled with a modeled steam-gasifier product gas is investigated showing no performance- or substrate degradation.