CFD Simulation of a Two-stage Hydrocyanide Stirred Kettle Reactor
Using computational fluid dynamics(CFD)technology,the secondary hydrocyanidation reactor in the direct hydrocyanidation of butadiene for the preparation of adiponitrile was studied.The velocity distribution,turbulent kinetic energy distribution,and power consumption were simulated to investigate the effects of blade type and baffle type on the flow field inside the reactor.By reducing the areas with poor flow in the flow field and making the flow field distribution inside the reactor more uniform,the yield of adiponitrile can be improved.The results showed that the flow field of the disc turbine impeller(DT impeller)was similar to that of the four oblique blade open turbine impeller impeller(FD impeller),and the turbulence generated was not high.The anchor frame impeller(AF impeller)had the most turbulent fluid in the reactor and the best stirring effect.The power of DT propeller was 2.68 W,FD propeller was 2.64 W,and AF propeller was 5.08 W.The width of the baffle was 25 mm,and the aperture of the perforated baffle was 12 mm.The perforated baffle enhanced the near wall flow velocity,effectively improved the flow state of the fluid in the mixing tank,and increased the effective utilization rate of the mixing tank's power.Thus the reactor used AF paddles and perforated straight baffles.
secondary hydrocyanidation reactionfluid dynamicsturbulence modelturbulent kinetic energy
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