420kA大型铝电解槽槽上部集气烟道结构优化改造

Optimization and Modification of Upper Flue Structure in 420kA Large-Scale Aluminum Reduction Cells

对420kA大型铝电解槽槽上部集气烟道的结构优化与改造进行了研究。利用FLUENT软件对某公司420kA电解槽V形单烟道内烟气流动状况进行了仿真模拟,获得了烟气在出口压力设定为-400Pa时电解槽槽腔以及集气烟道内的速度场、压力场的分布情况。针对其不足,将其优化改造为上位双烟道分区集气结构,通过模拟计算结果和生产现场实际数据进行对比,仿真结果正确可靠。优化改造后的烟道集气效果较好,可实现烟道集气均匀,能提高烟道集气效率,可实现电解槽的节能降耗。通过进一步模拟计算获知,当优化改造后的烟道出口压力调节至-300Pa时即可满足生产和设计要求。

Structure optimization and improvement of flue in upper part of 420 kA large-scale aluminum reduction cells were investigated.The FLUENT software was used to simulate fume flow in V-shaped single flue.Distribution of velocity field and pressure field in cavity of aluminum reduction cells and flue are obtained when outlet pressure is set at-400 Pa.V-shaped single flue is transformed into upper dual flue with fume covering different areas after analyzing deficiencies of V-shaped single flue＇s structure.Comparison with real data in production field shows simulation results are correct and reliable.The modified flue has better fume collection effect,which can homogenize the fume,improve gas collection efficiency and reduce energy consumption of aluminum reduction cells.Further numerical simulation shows that requirements of production and design can be satisfied when outlet pressure is adjusted to-300 Pa.