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Zhenya Duan,Haodong Zhang,Bin Liu,Zhiwei Sun,Junmei Zhang,Longlong Lin 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
Based on the fact that the distance between the heat exchange surfaces has little influence on the separation efficiency in the short-path distillation, a hypothesis that the heat and mass transfer process in the transition region is controlled by heat convection is proposed; the gas-liquid state in the transition zone was calculated by numerical simulation experiment. The results show that the gas-liquid volume fraction and temperature fluctuation in the evaporation and condensation process is unstable, while the gas-liquid volume fraction and temperature fluctuation in the transition zone is stable in the short-path distillation process. It can be concluded that in unsteady thermodynamics, the transition zone is a stable convective heat transfer process that is not affected by the distance between heat transfer surfaces. Thus, under ideal conditions, the continuous extension of the transition region has little effect on the distillation efficiency.
Study on the performance of different discharging devices of a continuous production system
Zhenya Duan,Jie Wang,Shujie Sun,Wenchen Li,Haodong Zhang,Guoyue Qiao,Junmei Zhang,Jingtao Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Based on the developed continuous production system of sodium phenol carboxylation reaction, severaltypes of discharging devices are proposed, which are suitable for the case where the transported particles are not easyto maintain a stable state in the transported fluid. Numerical simulations of the gas-solid two-phase flow characteristicsand particle distribution were performed with DPM, and the particle retention ratio and fluid loss degree were proposedto investigate the performance of the discharging devices. The results of simulations and industrial experimentsshowed that a guide plate installed in the “B” discharging device can solve the accumulation problem, realize the efficientand continuous delivery of the particles, and maintain a uniform distribution of particles. This study can providea reference for the design of a gas-solid two-phase discharging device, and guide the industrial experimental operationand modification of continuous production systems for sodium phenol carboxylation.