CFD Simulation Study On Liquid Distributor Of High Gravity Reactor

Chemical process intensification technology is considered to be the key technology for energy conservation and consumption reduction in the chemical industry.High gravity reactor(rotating packed bed,RPB)is one of the typical representatives of process intensification equipment.In response to the processes of reaction absorption and continuous distillation in chemical production,our research group has developed a multi-stage high gravity reactor,where multiple rotors are installed on a single rotating shaft.Due to the lack of pump pressure,the liquid distribution from the upper rotor and its collection plate to the lower rotor is uneven,resulting in waste of some fillers in the lower rotor,greatly reducing the gas-liquid mass transfer efficiency.Based on this,this paper relies on the previous experimental exploration and industrial application of multistage high gravity reactor,and combines computational fluid dynamics(CFD)simulation and visualization experimental means to optimize the design of the liquid distributor structure of the high gravity reactor,providing a theoretical basis for the design of industrial reactors.The main conclusions are as follows:(1)Firstly,the computational domain model of the high-gravity reactor with liquid distributor is established,the grid is divided and the independence is checked,and a CFD simulation method suitable for the study of rotating liquid distributor is established.The VOF multiphase flow model and SST k-ωturbulence equation is selected for calculation.The simulation method is verified by visual experimental results,and the error is within ± 15%.(2)The radial distribution of liquid was studied by CFD simulation.Using the established simulation method,the distributors with different baffle structures and different baffle bending angles,baffle length and baffle width were simulated and calculated respectively.The liquid distributors were compared from three aspects: liquid flow pattern,liquid velocity distribution and liquid and liquid impacting angle.It is determined that the left-bending L-wheel structure with a length of 7.5 mm and a width of 4 mm is a better structure.(3)The axial distribution of liquid on the distributor was simulated by CFD.The liquid distributors with different axial arrangements were simulated and compared from three aspects: liquid flow pattern,liquid velocity distribution and liquid axial volume distribution.It is determined that the final liquid distributor has three layers of wheel arrangement,the number of wheels in each layer is 4-5-10.