Multi-objective optimization of two hybrid power generation systems for optimum selection of SOFC reactants heat exchangers mid-temperatures

Document Type: Research Paper


1Department of mechanical engineering, Graduate University of advanced technology, Kerman, Iran


Increasing efficiency and decreasing cost are the main purposes in the design of the power generation systems. In this study two hybrid systems: solid oxide fuel cell (SOFC)-gas turbine (GT) and SOFC-GT-steam turbine (ST); are considered. Increasing the SOFC input temperature causes thermodynamics improvement in the hybrid system operation. For this purpose, using two set of SOFC reactants heat exchangers (primary heat exchangers and secondary heat exchangers) are recommended. Selection of The primary heat exchangers output temperature and therefore the secondary heat exchangers input temperature (heat exchangers mid-temperatures) influences on the thermodynamics and economics operation of the hybrid system. This work shows that the annualized cost (ANC) and the levelized cost of energy (LCOE) act in conflict with each other. The MatLab genetic optimization algorithms are used to obtain the optimum solutions. The maximum achievable efficiency is 0.599 and the minimum LCOE is 0.0163 $/kWh. Also results show that the heat exchangers mid-temperature of air has the main role in the operation of the hybrid system.


Main Subjects

[1] Larminie J. and Dicks A., 2nd ed., Fuel cell systems explained, Academic Press, 2003.

[2] Singhal S. C. and Kendel K., 2nd ed., High temperature solid oxide fuel cell: fundamental, design and applications,  Academic Press, 2003.

[3] Palsson J., Selimovic A. and Sjunnesson L., “Combined solid oxide fuel cell and gas turbine systems for efficient power and heatgeneration”, J. Power Sources, 2000, 86:442.

[4] Zhang X., Chan S. H., Li G., Ho H. K., Li J. and Feng Z., “A review of integration strategies for solid oxide fuel cells”, J. Power Sources, 2010, 195:685.

[5] Gupta G. K., Marda J. R., Dean A. M., Colclasure A. M., Zhu H. Y. and Kee R. J., “Performance predictions of a tubular SOFC operating on a partially reformed JP-8 surrogate”, J. Power Sources, 2006, 162:553.

[6] Ni M., Leung M. K. H. and Leung D. Y. C., “A modeling study on concentration over potentials of a reversible solid oxide fuel cell”, J. Power Sources, 2006, 163:460.

[7] Milewski J., Swirski K., Santarelli M. and Leone P., 1st ed., Advanced methods of solid oxide fuel cell modeling, Academic Press, 2011.

[8] Huang K. and Goodenough J. B., 1st ed., Solid oxide fuel cell technology: principles, Academic Press, 2009.

[9] Wereszczak A., Lara-Curzio E. and Bansal N. P., 1st ed., Advances in solid oxide fuel cells II, Academic Press, 2006.

[10] O’Hayre R., Cha S. W., Colella W. and Prinz F. B., 2nd ed., Fuel cell fundamentals, Academic Press, 2009.

[11] Chan S. H., Ho H. K., Tian Y., “Modeling of simple hybrid solid oxide fuel cell and gas turbine power plant”, J. Power Sources, 2002, 109:111.

[12] Chan S. H., Ho H. K. and Tian Y., “Multi-level modeling of SOFC-gas turbine hybrid system”, Int. J. Hydrogen Energy, 2003, 28:889.

[13] Chan S. H., Ho H. K. and Tian Y., “Modeling for part-load operation of solid oxide fuel cell-gas turbine hybrid power plant”, J. Power Sources, 2003, 114:213.

[14] Costamagna P., Magistri L. and Massardo A. F., “Design and part-load performance of a hybrid system based on a solid oxide fuel cell reactor and a micro gas turbine”, J. Power Sources, 2001, 96:352.

[15] Cheddie D. F., “Thermo-economic optimization of an indirectly coupled solid oxide fuel cell/gas turbine hybrid power plant”, Int. J. Hydrogen Energy, 2011, 36:1702.

[16] Cheddie D. F. and Murray R., “Thermo-economic modeling of a solid oxide fuel cell/gas turbine power plant with semi-direct coupling and anode recycling”, Int. J. Hydrogen Energy, 2010, 35:11208.

[17] Santin M., Traverso A., Magistri L. and Massardo A., “Thermo-economic analysis of SOFC-GT hybrid systems fed by liquid fuels”, Energy, 2010, 35:1077.

[18] Arsalis A., “Thermoeconomic modeling and parametric study of hybrid SOFC-gas turbine-steam turbine power plants ranging from 1.5 to 10 MW”, J. Power Sources, 2008, 181:313.

[19] Autissier N., Palazzi F., Marechal F., Van Herle J. and Favrat D., “Thermo-economic optimization of a solid oxide fuel cell, gas turbine hybrid system”, J. Fuel Cell Sci. Technol., 2007, 4:123.

[20] Palazzi F., Autissier N., Marechal F. M. A. and Favrat D., “A methodology for thermo-economic modeling and optimization of solid oxide fuel cell systems”, Appl. Therm. Eng., 2007, 27:2703.

[21] Ahamdi P. and Dincer I., “Thermodynamic and exergoenvironmental analyses, and multi-objective optimization of a gas turbine power plant”, Appl. Therm. Eng., 2011, 31:2529.

[22] Ahamdi P. and Dincer I., “Exergoenvironmental analysis and optimization of a cogeneration plant system using multimodal genetic algorithm (MGA)”, Energy, 2010, 35:5161.

[23] Ahmadi P., Rosen M. and Dincer I., “Greenhouse gas emission and exergo-environmental analyses of a trigeneration energy system”, Int. J. Green Gas Control, 2011, 5:1540.

[24] Chan S. H., Low C. F. and Ding O. L., “Energy and exergy analysis of simple solid oxide fuel cell power systems”, J. Power Sources, 2002, 103:188.

[25] Volkan Akkaya A., “Electrochemical Model for Performance Analysis of a Tubular SOFC”, Int. J. Energy Research, 2007, 31:79.

[26] Sadeghi S . and Ameri M., “Study the Combination of Photovoltaic Panels With Different Auxiliary Systems in Grid-Connected Condition”, J. Solar Energy Eng., 2014, 136:636.