Numerical Simulation of Temperature Distribution in a Pilot Thermal Reactor for Methanol to Dimethyl Ether
Based on the numerical simulation for the catalytic reaction of gaseous methanol to dimethyl ether in a small reactor,the effects of different reaction temperatures on the axial and radial temperature distribution of the catalyst bed were investigated under a certain methanol mass space velocity.The results show that when the methanol mass space velocity is 1 h-1 and the reaction temperature is 250℃,the axial temperature of the catalyst bed is parabolically distributed,and reaches the highest at the middle and lower parts of the bed.The simulation results are in good agreement with the experimental results.At the same time,the radial temperature distribution at each axial height of the bed is characterized by higher value in the center and lower one near the wall.While the methanol mass space velocity is 1 h-1 and the reaction temperature is 270℃ and 290℃ respectively,the axial temperature distribution of the bed is lower at the inlet and outlet and higher at the middle position,which is similar to the result under the reaction temperature of 250℃.At the same time,the radial temperature distribution at each axial height of the bed shows the distribution characteristics of higher value near wall and lower one in the center,which is opposite to results under the reaction temperature of 250℃.
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