锂电解槽极间通道内两相流场数值模拟

Numerical simulation of two-phase flow in electrode channels in lithium electrolysis cell

通过建立锂电解槽电解质-氯气气液两相流二维模型,使用标准k-ε两方程模型耦合欧拉-欧拉模型求解不同极间通道内电解质速度与体积分数分布,研究电流密度均匀和不均匀分布对气体分率与液相速度的影响。结果表明:均匀模型的体积分数和液相速度均大于非均匀模型;对不同结构和操作参数的分析发现,缩短极距能够降低体积分数,使侧面极间通道内电解质速度增加,中间极间通道内速度下降;增大阳极半径,体积分数与液相速度均下降;增加电解质液面高度对两者的影响不大,增大电流则会使两者增加。

A 2D model of electrolyte-chlorine gas-liquid two-phase flow in lithium electrolysis cell was established.The standard“k-ε”two-equation model used with the Euler-Euler model was used to solve the electrolyte velocity and volume fraction in different inter-electrode channels.Considering the influence of uniform and non-uniform distribution of current density on volume fraction and liquid flow rate,it is obtained that the volume fraction and liquid flow rate of uniform model are greater than that of non-uniform model.The study of various cell components and operating parameters showed that a reduced electrode distance could reduce the volume fraction and increase the electrolyte velocity in the side channel.This would contrastingly reduce the velocity in the middle channel.Furthermore,it was found that increasing the anode radius would decrease the volume fraction and liquid velocity.Also,increasing the electrolyte height yielded no noticeable effects but increasing the current intensity increased both the volume fractionand liquid velocity.