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In this work, an integrated system of biogas tri-reforming and fuel cells (MCFC and SOFC) were studied by using Aspen Plus v.9.0. Biogas obtained from sewage of sugar industry contained 75 % CH4 and 25 % CO2. The effect of several parameters including tri-reforming temperature (200-1,200 ºC), steam/carbon (S/C) molar ratio (0.1-3.0), oxygen/carbon (O2/C) molar ratio (0.1-1.0), MCFC temperature (600-750 ºC), and SOFC temperature (800-1,000 ºC) on power generation were investigated. The simulation results showed that the optimal operating conditions provided the highest hydrogen production from tri-reforming were tri-reforming temperature of 700 ºC, S/C molar ratio of 3.0, and O2/C molar ratio of 0.1. Under these conditions of tri-reforming, the optimal operating conditions of MCFC and SOFC provided maximum power generation were temperature of 750 ºC for MCFC and temperature of 1,000 ºC for SOFC under atmospheric pressure. Moreover, the comparison of system performance in term of power density was evaluated. The results showed that power density of SOFC was 5807.33 W/m2, which was higher value than that of MCFC system (3085.14 W/m2).
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