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The effect on performance of a solid oxide fuel cell-micro gas turbine ͑SOFC-MGT͒ hybrid system on mixing or replacing natural gas, the normal fuel of such hybrid systems, with biomass gasified fuel ͑biofuel͒ was studied. It was found that the efficiencies of the SOFC module and of the hybrid system noticeably decrease when natural gas is completely replaced by biofuel but that the system can still be operated at a reasonable condition. To explain these results, changes in spatial distributions of temperature and concentration of certain chemical species inside an internal reforming type SOFC module are also discussed.

Performance analysis of the solid oxide fuel cell-microgas turbine (SOFC-MGT) hybrid system has been made. We assume a fuel composition that is methane based with varying concentrations of other species that are expected to be present in biomass-derived gas streams in preparation for the study of biomass fueled SOFC-MGT hybrid system. This is based on the fact that the chemical composition of biomass fuel produced from different fuel production processes is diversified, i.e., in one case one chemical species rich in concentration and in another case another chemical species rich. In the analysis, the multistage model for internal reforming SOFC module developed previously with some modification is used. With this model, studies cover not only the performance of the hybrid system but also the spatial distributions of temperature and concentration of some chemical species inside the module, namely, in the cell stack and in the internal reformer.