ABSTRACT

A three-dimensional numerical model consistent with physical simulations (water/oil/thymol) has been developed to explore the mass transfer behaviour of sulphur. Euler-Lagrangian and Euler-Euler, were applied to simulate the multiphase flow; compared with experimental data, the Euler-Euler method was more accurate. The small eddy model was used for mass transfer calculations. As a new type of bottom stirring scheme, the effect of central-eccentric parallel injection on mass transfer was investigated. Moving the eccentric nozzle towards the sidewall or increasing the number of eccentric nozzles decreases the mass transfer rate at a constant total gas flow rate. The mass transfer rate increases with increasing central gas flow rate under the differential flow bottom stirring scheme. The single-nozzle central injection is still considered the most superior bottom-blowing scheme. The bubble diameter has an insignificant effect on the liquid–liquid mass transfer. The mass transfer rate of thymol is weakly accelerated with increasing bubble diameter.

摘要

已经开发了与物理模拟（水/油/百里香酚）一致的三维数值模型来探索硫的传质行为。Euler-Lagrangian和Euler-Euler，被应用于模拟多相流；与实验数据相比，Euler-Euler方法更准确。小涡模型用于传质计算。作为一种新型底部搅拌方案，研究了中心偏心平行喷射对传质的影响。将偏心喷嘴移向侧壁或增加偏心喷嘴的数量会降低在恒定总气体流速下的传质速率。在差流底部搅拌方案下，传质速率随着中心气体流量的增加而增加。单喷嘴中央喷射仍然被认为是最优越的底吹方案。气泡直径对液-液传质影响不大。百里酚的传质速率随着气泡直径的增加而微弱地加快。