(1. 中南大學 冶金與環(huán)境學院，長沙 410083；
2. 南瑞(武漢)電氣設備與工程能效測評中心，武漢 430074；
3. 江西理工大學 冶金與化學工程學院，贛州 341000)
摘 要: 在深入分析鋁電解槽流體體系及氧化鋁消耗機理的基礎上，建立某500 kA特大型鋁電解槽內氧化鋁輸運過程的多組分多相瞬態(tài)模型，并在CFX12.0平臺上實現(xiàn)全槽氧化鋁濃度分布情況的瞬態(tài)解析。結果表明：研究的500kA級鋁電槽內氧化鋁濃度場受熔體流動影響而具有顯著的時間性和槽內空間性差異。下料后很短的時間內，在下料點正下方區(qū)域的氧化鋁濃度急劇增加，達到最大值3.9%(質量分數(shù))；之后，隨著電解質的流動，不斷分散回落到2.8%左右。在推動氧化鋁的輸運上，陽極氣泡對氧化鋁傳質的驅動作用比電磁力大，但范圍沒有電磁力廣。
關鍵字: 鋁電解；氧化鋁濃度；數(shù)值仿真；濃度場
（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
