(285e) An Innovative Hydrogen and Power Coproduction System Using Integrated  Exergy Recuperative Biomass Gasification and SOFC

A novel hydrogen and power coproduction system based on the exergy recuperative biomass gasification integrated with solid oxide fuel cell was proposed. In this system micro-tubular SOFC stacks are immersed in the internal circulating fluidized bed gasifier. The exothermic heat from SOFC is recuperated and utilized for endothermic heat of biomass steam gasification. In addition, providing the recirculation system of unreacted hydrogen separated from SOFC anode exhaust, gas turbine can be eliminated. Since the exergy loss of SOFC is much smaller than that of gas turbine, the net power generation efficiency of the combination of gasification and SOFC power generation system can be considerably improved. The internal circulating fluidized bed was composed of a moving bed high-temperature pyrolyzer with the function of tar cracking, a bubbling bed char gasifier equipped with micro-tubular SOFC stacks, and a fluidized bed combustor of remained char. A 20 kW-class pilot plant was constructed and tested. In the present study, the conceptual design of a integrated exergy recuperative biomass gasification and SOFC system for hydrogen and power coproduction and the performance of exergy recuperative biomass gasification are described.