| The jet bubbling reactor is a new type of reaction equipment which combines the two action mechanisms of liquid jet and gas bubbling to realize the full mixing of gas and liquid in the reactor.The use of equipment can effectively avoid the corrosion of stirring equipment in the process of methanol low pressure carbonyl synthesis.The gas-liquid flow behavior in the jet bubbling reactor was studied by computational fluid dynamics(CFD)method.The influence of operating parameters and geometric structure parameters on the gas-liquid flow in the reactor were analyzed.Euler-Euler two-phase flow model and Realizable k-ε turbulence model were employed in the simulation.Through the study of liquid jet Reynolds number and superficial gas velocity,the interaction law of liquid jet and gas bubbling was found,and entire reactor was divided into the liquid jet area,the liquid jet bubbling area and the circulating flow area.The influence of liquid input power on the macroscopic mixing time of the reactor was analyzed from the perspective of energy input,and the correlation of mixing time was obtained tm=93.94PL-0.289PG-0.058.Further analysis shows that when the liquid input power accounts for 83%of the total input power,the synergistic mixing effect of liquid jet and gas bubbling is the best.The geometrical structure of the reactor was optimized,and the nozzle type was determined to be conical straight nozzle,nozzle shrinkage Angle 14°,length-diameter ratio of nozzle 1,nozzles height 0.39 m,height-diameter ratio of reactor 1.8.In order to ensure that the gas-liquid two phases flow is consistent before and after the reactor scale-up,the scale-up principles of constant liquid input power per unit volume,constant gas-liquid feed ratio and constant superficial gas velocity were put forward.Taking the similar scale-up coefficient S=2 as an example,the operating parameters of the reactor after scale-up were calculated,and the production capacity of the reactor after scale-up increased by 5.44 times. |
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