锂电解槽流场行为及浓度场分布模拟研究

Research on the simulation of flow field behavior and concentration field distribution in Li reduction cell

针对锂电解槽多物理场模拟仿真中关注较少的锂电解槽氯化锂浓度场开展初步研究。首先建立气泡驱动的气泡-电解质两相流动模型,随后进一步基于流动行为开发氯化锂浓度扩散模型。最后以氯化锂浓度扩散模型为工具开展针对下料位置的优化研究。研究发现仅仅通过改变下料点位置即可提高氯化锂的传输扩散速度30%,有利于提高电解槽内浓度、电导率、初晶温度和过热度的均匀性。

In this paper,the concentration field of lithium chloride in Li reduction cell,which is less concerned in the multi-physical field simulation of Li reduction cell,is studied preliminarily.Firstly,the bubble-bath two-phase flow model driven by bubbles is established,and then the lithium chloride concentration diffusion model is developed based on the flow behavior.Finally,the optimization of discharging position is carried out by using lithium chloride concentration diffusion model as a tool.It is found that the transmission and diffusion rate of lithium chloride can be increased by 30%only by changing the position of the discharging point,which is beneficial to improving the uniformity of concentration,conductivity,initial crystallization temperature and superheat in the reduction cell.