Abstract
For the first time, a multi-objective optimization approach is used to optimize energy efficiency with other conflicting objectives for tri-reforming of methane. A 2-D axisymmetric model over nickel based catalysts is established to maximize the energy efficiency, syngas production and CO2 conversion. The inlet temperature, oxygen/methane and carbon dioxide/methane are considered as the decision variables. The attained results revealed that at the utopia point for maximization of H2/CO ratio and energy efficiency, not only H2/CO ratio and energy efficiency reach 2.76 and 42.21, but also CH4 consumption overtakes 60%. Besides, when we consider maximization of CO2 conversion and energy efficiency as the objectives, 1% compromise in the best value of energy efficiency results in an increment of 40% in the value of CO2 conversion. Finally, the third optimization reveals that the CH4 conversion is above 80% and the final mole fraction of H2 is approximately 0.15.
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