Simulation of co-feeding gas for Fischer-Tropsch synthesis in slurry bubble column reactor

The effects of co-feeding gas on Fischer-Tropsch synthesis were studied in slurry bubble column reactor by modeling simulation.The optimized method of co-feeding gas in slurry bubble column was firstly selected through co-feeding inert gas.In this method,total reaction pressure and dispersion height were changed with co-feeding gas to keep the partial pressure of syngas and space velocity unchanged.Based on this method,the effects of CO2 and lower carbon olefins on Fischer-Tropsch synthesis were simulated.The results show that with inlet CO2 increasing the conversion of syngas decreases.The increasing CO2 results in the increasing of the mole ratio of olefin to paraffin;CO2 mainly affects the reactions of Fischer-Tropsch synthesis from water/gas shift reaction;when olefins are co-fed,the formation rates of hydrocarbons lighter than co-feeding olefin are suppressed,while the formations of hydrocarbons heavier than co-feeding olefin are enhanced.