Minimization of entropy generation rate in the reaction process of CO2 hydrogenation to light olefins
The CO2 hydrogenation to light olefins is a synthesis method of light olefins that does not use petroleum.Based on the theory of finite-time thermodynamics(FTT),the reaction process model including mixer,compressor,heat exchanger and CO2 hydrogenation to light olefins reactor is established and optimized.Taking the compressor efficiency and the decene(C10H20)yield as given parameters,and the heat reservoir temperatures of both the heat exchanger and the reactor as controllable factors,the optimization objective is to minimize the total entropy generation rate of the entire process.The minimum entropy generation rate of the process and the optimal configurations of the heat reservoir temperature distributions of both the heat exchanger and the reactor are derived numerically and compared with the corresponding process with the minimum entropy generation of the reactor.The results show that the optimized entropy generation rate of the reaction process is reduced by 7.77％compared with the reference process.Within the scope of optimization,the entropy generation rate of the reaction process can be reduced by selecting a lower heat exchanger outlet temperature,appropriately increasing the H2 mole fraction and reducing the CO2 mole fraction.The obtained results could supply theoretical guidance for the optimal design of CO2 hydrogenation to light olefins reaction process.
finite-time thermodynamicssynthesis of light olefinschemical reaction processminimization of entropy generation rate
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