A CFD Model for Synthesis of Dimethyl Ether Directly from Syngas in a Pseudo-homogeneous Fixed Bed Reactor

Tejbir Singh

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25-Oct-23

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A CFD Model for Synthesis of Dimethyl Ether Directly from Syngas in a Pseudo-homogeneous Fixed Bed Reactor

Author(s):

Tejbir Singh , NIT SRINAGAR

Keywords:

Direct DME synthesis; CFD Modelling; ANSYS FLUENT; Pseudo-homogeneous porous bed

Abstract:

A CFD-model for direct synthesis of Dimethyl Ether (DME) from syngas in a fixed packed bed reactor is presented. One of the recent methods of DME production is the direct conversion of syngas over a dual-catalyst mixture. For the above model, Graaf kinetic model for methanol synthesis and Bercic model for methanol dehydration are used. Three-dimensional CFD simulations of the reactor are demonstrated at operating conditions of 250°C temperature and 8 bar pressure. The compositions of the reactants in the feed streams are 0.32 Carbon-mono-oxide, 0.64 Hydrogen and 0.04 Carbon-dioxide. The simulation results are validated with the available experimental results and further analyzed. The partial pressures of different species are studied in reactor and with respect to time as well, the overall conversion of CO is noted to be 36% in comparison to the experimental value of 38%. The present CFD model results match well with experimental data. The concentration profile of species in terms of partial pressure within the reactor has been analyzed at different fraction of length as well as at different time level. From the results it is concluded that present CFD-model could be a starting point for further studies on the optimization of reactor performance.