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为了研究稀土电解槽阳极生成气体对电场影响,利用CFD软件二次开发功能建立气-液两相流场-电场耦合模型,首次提出将电场电导率与阳极气体气含率关系相结合的稀土电解槽流场-电场耦合数值模拟,并对比有无阳极气体气含率影响的电场电势云图及流场分布情况,研究发现,稀土电解槽阳极生成大量气体并在阳极表面形成动态气层,使得阳极附近熔盐扰动较为剧烈,其气液两相流区域的熔盐与阳极生成气体的混合相电导率受气体波动影响发生变化,熔体内部电场分布受到阳极生成气体影响,通过获取阳极深度175 mm、250 mm、300mm、350 mm、395 mm处的阳极生成气体气含率分布情况,发现气液混合相区域电导率随阳极生成气体气含率增高而增高,阳极上部生成气体气含率及动态气层厚度大于阳极下部,阳极气体气含率的熔体内部电场阳极上部电压降快于下部,电场等势线整体呈斜型分布,阳极上部部分区域电场等势线受到生成气体扰动影响呈现波动,同X坐标下槽内熔体电压上部小于下部,而电解槽底部由于为单相区,该处电场分布并未受到阳极气体直接影响。
In order to study the influence of the anode formation gas on the electric field in the rare earth electrolyzer, the gas-liquid two-phase flow field-electric field coupling model was established by the secondary development function of the CFD software. It was first proposed to combine the electric field conductivity with the anode gas gas holdup Slot flow field and electric field coupling numerical simulation, and compared with or without the anode gas gas holdup effect of the electric field potential cloud and flow field distribution, the study found that the rare earth electrolysis cell anode to generate a large number of gases and the formation of a dynamic gas layer on the anode surface, making the anode The molten salt perturbation nearby is more violent. The conductivity of mixed phase of molten salt and anode forming gas in the gas-liquid two-phase flow field is affected by gas fluctuations. The electric field distribution inside the melt is affected by the anode gas. The anode depth of 175 mm , 250 mm, 300 mm, 350 mm and 395 mm, respectively. It was found that the conductivity of gas-liquid mixed phase increased with the gas holdup of the anode gas. The gas holdup and the dynamic The gas layer thickness is larger than that of the lower part of the anode. The voltage drop of the internal electric field in the anode of the anode gas is faster than that of the anode. The distribution of the equipotential lines in the upper part of the anode is fluctuating due to the disturbance of the generated gas. The upper part of the melt voltage in the tank under the X coordinate is smaller than the lower part, and the bottom of the electrolytic cell is a single-phase region where the electric field distribution is not Directly affected by the anode gas.