泄流式电解槽热电场数值模拟
首发时间:2009-01-08
摘要:本文对新型结构泄流式电解槽的热电场进行了数值模拟。对于有可能影响电解槽能量平衡的因素分别进行了讨论。计算结果表明,将75kA预焙电解槽改造成泄流式电解槽后,由于极距的降低,能量收入的减少,电流强度须强化至94kA可维持较好的能量平衡。在阴极倾角小于9o 之前,阳极、阴极、极间及槽总体压降随倾角增大而降低,大于9o 后则随之升高。在倾角9o 左右能量平衡效果最佳。聚铝沟内铝液面越低,阳极、阴极、极间及槽总体压降越高,在铝液充满聚铝沟时,阳极、阴极、极间及槽总体压降最低,且能量平衡效果最佳。聚铝沟宽度越小,槽压降越高。在聚铝沟宽度与边部加工面同宽时,能量平衡效果最好。适当加强侧部保温,并将电流降低至87kA时,电解槽总体压降较低,能量平衡效果较好,且侧部炉帮占据聚铝沟空间较小。此方案更为理想。
关键词: 泄流式电解槽 阴极倾角 聚铝沟 铝液高度 能量平衡
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Numerical Simulation of Electro-thermal Field of Drained-cathode Reduction Cells
Abstract:Numerical simulation is done for new-structured drained-cathode cells and influencing factors for energy balance are discussed. It is found that drained-cathode cells retrofitted from 75kA PB cells must be intensified to 94kA to keep energy balance because of the ACD reduction. While inclination angle smaller than 9o, the voltages of anode, cathode, bath and the whole cell decrease with angles but increase with angles after 9o. Energy balance is best at about 9o among all angles. The lower the metal height, the higher the voltages of anode, cathode, bath and the whole cell. Voltages are the lowest and energy balance is the best while the metal fully fills the groove. The narrower the groove, the higher the cell voltage and the worse the energy balance. With strengthened side insulation, cell current can be lowered to 87kA and cell voltage is noticeably reduced. Meanwhile, energy balance can be well kept. Metal groove is less occupied by ledges thence bigger enough for metal. This plan is the best of all in terms of energy consumption and operation.
Keywords: Drained-cathode cell inclination angle metal groove metal height energy balance
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