保护气氛下电渣重熔过程中界面脱硫传质动力学

电渣重熔过程中渣金反应温度高,接触面积大,具有良好的脱硫传质条件.然而,渣金界面处存在着传质边界层,边界层的厚度会影响界面脱硫传质速率,这对研究界面脱硫传质具有重要的意义.本文基于菲克第二定律、渗透理论和薄膜理论,建立保护气氛条件下电渣重熔过程渣-金界面脱硫传质方程,研究温度对渣-金间脱硫传质速率的影响规律.研究结果表明:随着温度的升高,渣-金界面处硫的浓度减小,界面脱硫传质速率增大;渣-金界面硫扩散的传质边界层厚度不随温度发生变化.

Three-dimensional simulation of interfacial convection in CO_2–ethanol system by hybrid lattice Boltzmann method with experimental validation

By using a hybrid lattice-Boltzmann–finite-difference method(hybrid LBM–FDM method),three-dimensional simulations of solutal interfacial convection were conducted for the process of CO2absorption into ethanol.A self-renewal interface model is adopted as an interfacial perturbation model.The simulation results revealed some three-dimensional features of the induced interfacial convection,such as the development of diverging cellular flow and Rayleigh plume-like convection in liquid phase.The concentration distribution of the simulation result is validated and found to be in well agreement with the Schlieren visualization results qualitatively.Additionally,the mass transfer enhancements by interfacial convection were investigated via both simulation and experiment for the absorption process,and the mass transfer is shown to be enhanced by the interfacial convection by about two-fold comparing with that by diffusion.