粉煤灰所产新型氧化铝电解过程中流场仿真研究

Chemical and Materials Engineering.1990,University of Auckland:Auckland,New Zealand.Simulation and Analysis of Flow Field in Electrolysis Process of New Alumina Produced by Fly Ash

本文以粉煤灰提取的新型氧化铝为电解原料,根据新型氧化铝性能特点,基于200 kA铝电解槽开展仿真计算,研究电解槽内电解质流场和新型氧化铝浓度的分布,分析影响新型氧化铝溶解、扩散及对流的传质因素,掌握新型氧化铝电解过程中溶解输运性能。结果显示,新型氧化铝在电解质中溶解速度快、分散均匀,电解质流场稳定,电解质出铝端和烟道端角部位置的氧化铝溶解最快。在实际生产中,通过合理配置下料器及下料点控制氧化铝浓度的分散、输运,可保持氧化铝浓度分布均匀、电解质流场稳定,有利于减少阳极效应和提高电流效率。

In this paper,the new alumina extracted from fly ash was used as the electrolytic raw material.According to the performance characteristics of the new alumina,the simulation calculation was carried out based on the 200 kA aluminum electrolytic cell.The electrolyte flow field and the distribution of the new alumina concentration in the electrolytic cell were studied.The mass transfer factors affecting the dissolution,diffusion and convection of the new alumina were analyzed,and the dissolution transport performance in the new alumina electrolysis process was mastered.The results show that the new alumina dissolves quickly and uniformly in the electrolyte,the electrolyte flow field is stable,and the alumina at the aluminum end and the corner of the flue end dissolves fastest.In actual production,by reasonably configuring the feeder and the feeding point to control the dispersion and transport of alumina concentration,the uniform distribution of alumina concentration and the stability of electrolyte flow field can be maintained,which is beneficial to reduce the anode effect and improve the current efficiency.