(1. 中南大学 冶金与环境学院，长沙 410083；
2. 南瑞(武汉)电气设备与工程能效测评中心，武汉 430074；
3. 江西理工大学 冶金与化学工程学院，赣州 341000)
摘 要: 在深入分析铝电解槽流体体系及氧化铝消耗机理的基础上，建立某500 kA特大型铝电解槽内氧化铝输运过程的多组分多相瞬态模型，并在CFX12.0平台上实现全槽氧化铝浓度分布情况的瞬态解析。结果表明：研究的500kA级铝电槽内氧化铝浓度场受熔体流动影响而具有显著的时间性和槽内空间性差异。下料后很短的时间内，在下料点正下方区域的氧化铝浓度急剧增加，达到最大值3.9%(质量分数)；之后，随着电解质的流动，不断分散回落到2.8%左右。在推动氧化铝的输运上，阳极气泡对氧化铝传质的驱动作用比电磁力大，但范围没有电磁力广。
关键字: 铝电解；氧化铝浓度；数值仿真；浓度场
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. NANRI (Wuhan) Electrical Equipment and Engineering Efficiency Evaluation Center, Wuhan 430074, China;
3. School of Metallurgical and Chemical Engineering,
Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:Based on the in-depth analysis of aluminium reduction cell fluid system and the mechanism of alumina consumption characteristics, the transient multicomponent and multiphase model for simulating the transport process of alumina in 500 kA aluminum reduction cells was developed in CFX12.0, which realized the accurate transient analysis of the alumina concentration distribution within the whole cell. The results show that the alumina concentration field which is affected by the melt flow has significant difference of timeliness and spatiality of cell. In a short period after feeding, alumina concentration below discharging points increases to maximum of 3.9% (mass fraction) sharply, and then decreases to around 2.8% as the electrolyte flows continuously. In promoting the alumina transport, the effect of anode bubble on the alumina mass transfer is greater than the electromagnetic force, but the affected range of anode bubble is smaller than that of electromagnetic force.
Key words: aluminium electrolysis; alumina concentration; numerical simulation; concentration field
