Exergy and environmental analysis of a power and heat co-generation system fed by rice husk

In the present study, a power and heat cogeneration system consisting of solid oxide fuel cell and biomass gas is introduced. In this system, heat pipes were used to transfer heat from the after burner to the gasifier. The results show that as the fuel cell temperature increases, the efficiency of the system increases and the irreversibility decreases. Cold gas efficiency of biomass gasification and exergy efficiency are achieved 91.74% and 45.79%, respectively, at the current density of 4000 A/m2 and outlet solid oxide fuel cell temperature of 850 °C.  Hydrogen percent is 35% in the gas composition of the gas outlet.