Simulation of alumina dissolution and temperature response under different feeding quantities in aluminum reduction cell
铝电解槽不同投料量下氧化铝溶解的模拟及其温度响应(英文)作者机构:School of Energy Science and Engineering Central South University
出 版 物:《Journal of Central South University》 (中南大学学报(英文版))
年 卷 期:2019年第26卷第8期
页 面:2119-2128页
核心收录:
学科分类:080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程]
基 金:Project(2010AA065201) supported by the High-Tech Research and Development Program of China Project(2018zzts157) supported by the Fundamental Research Funds for the Central Universities,China
主 题:alumina dissolution heat and mass transfer particle size distribution temperature response numerical
摘 要:In the feeding process of aluminum electrolytic, feeding quantity of alumina affects eventually dissolved quantity at the end of a feeding cycle. Based on the OpenFOAM platform, dissolution model coupled with heat and mass transfer was established. Applying the Rosin-Rammler function, alumina particle size distribution under different feeding quantities was obtained. The temperature response of electrolyte after feeding was included and calculated, and the dissolution processes of alumina with different feeding quantities (0.6, 0.8, 1.0, 1.2, 1.4, 1.6 kg) after feeding were simulated in 300 kA aluminum reduction cell. The results show that with the increase of feeding quantity, accumulated mass fraction of dissolved alumina decreases, and the time required for the rapid dissolution stage extends. When the feeding quantity is 0.6 kg and 1.2 kg, it takes the shortest time for the electrolyte temperature dropping before rebounding back. With the increase of feeding quantity, the dissolution rate in the rapid dissolution stage increases at first and then decreases gradually. The most suitable feeding quantity is 1.2 kg. The fitting equation of alumina dissolution curve under different feeding quantities is obtained, which can be used to evaluate the alumina dissolution and guide the feeding quantity and feeding cycle.