Energy and exergy analysis of a sugar cane bagasse gasifier integrated to a solid oxide fuel cell based on a quasi-equilibrium approach

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2013-07, Vol.228, p.1121-1132
• Main Authors: Arteaga-Pérez, Luis E., Casas-Ledón, Yannay, Pérez-Bermúdez, Raúl, Peralta, Luis M., Dewulf, Jo, Prins, Wolter
• Format: Article
• Language: English
• Subjects: air; Bagasse; biomass; Biomass gasification; Carbon; chemical engineering; Conversion; electrochemistry; electrodes; energy efficiency; Exergy; Fuel cell; fuel cells; Gasification; heat; hydrogen; Mathematical models; Oryza sativa; rice hulls; Solid oxide fuel cells; Sugar cane; sugarcane bagasse; temperature; Thermodynamic analysis
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2013.05.077

•Investigation on the exergetic feasibility of an integrated gasifier-SOFC system.•A gasifier model based on a quasi-equilibrium approach experimentally validated.•Integration of mathematical models for tar formation and carbon conversion.•A survey about the influence of process parameters on systems performance. The objective of the paper being presented is to develop a comprehensive mathematical model of a bagasse gasification unit integrated with a solid oxide fuel cell, to predict the system performance using the energy and exergy criteria. The model addresses the quasi-equilibrium approach of the gasifier and the electrochemical behavior of a solid oxide fuel cell fed with producer gas. The quasi-equilibrium approach is discussed based on the experimental data from a pilot bubbling gasifier for two biomass sources: sugar cane bagasse and rice husk. The model considers the effect of equilibrium temperature, carbon conversion, heat losses and tar removal in the gasifier and the in situ reforming, water gas shift and hydrogen conversion within cell electrodes. The best results are obtained at 1023K and a 0.30 of air factor, under these conditions the total exergy efficiency is 35.20% and 58.85% of energy efficiency. After systems integration, the major exergy destruction is found in the gasifier ranging from 75% to 80% of the total loss.