Oxy-pressurized fluidized bed combustion: Configuration and options analysis

•Shifting to biomass resulted in reductions in both power and oxygen requirements.•Increasing the operating pressure led to a higher amount of available heat.•An optimum operating pressure between 7 and 15 bar(g) was obtained.•The use of a WSA process for sulphur removal resulted in increases in useable heat.•Changes in flue gas O2 concentration via WSA impacts process performance.