Numerical Simulation On The Jet Loop Reactor

JLR combines with the technological advantages of jet and circulation.Because of the strong cycle. It is beneficial for mass transfer, heat transferand diffusion. It has plenty of excellent characteristics: high mass transferefficiency, hort hydraulic retention time, high volume of load, strongresistance to impact load. Research for JLR mainly focused on thegas-liquid and gas-solid. Research for JLR on liquid-solid is less. Thenozzle is important structure of JLR.The change of nozzle radius andnozzle position has great influence on flow fields, as a result, affect themass transfer efficiency of entire reactor.This paper based on previous studies， using computational fluiddynamics method, combined with numerical simulation and experimentalmethod to research injection nozzle structure and position of JLR.The speed was first measured under different nozzle exit speed anddifferent nozzle position, and the speed distribution was rendered. Thispaper used three turbulence models inside FLUENT which were standardk-ε model, Realizable k-ε model and RNG k-ε model to simulat calculation the velocity field inside JLR, and compared with the experimental value,found that standard k-ε model better agreed with the experimental valuebest.Standard k-ε model was adopted to simulate velocity and pressurefield, turbulent kinetic energy, internal and external circulation ratio underdifferent nozzle radius, different positions within the nozzle JLR. Byanalyzing the results, the optimal nozzle radius and optimal nozzle positionwere selected. The optimal nozzle position was40mm, r0/h0equal0.08was the optimal nozzle radius parameters.In the liquid-solid two-phase simulation, DPM model was chosen.Multiphase model was set on the basis of turbulent simulation. Thedistribution and motion of solid particles in the loop reactor was shown.Particle residence time under different speeds and particle residence time ofdifferent particle diameter were calculated. Using mixture model, particlesolid content rate was calculated.The study provided theory basis for designing and magnifying JLR bycalculating and analyzing the velocity field, JLR inside pressure field, andturbulent kinetic energy, internal and external circulation ratio.