铝电解槽石墨化阴极和槽壳的变形

Deformation in the graphitized cathodes and on the shells of aluminum reduction cells

摘要: 通过实验室和工业电解槽系统研究了铝电解槽阴极和槽壳的变形,从中获取钠膨胀系数并用于工业阴极和槽壳的应力场的模拟分析,在考虑温度梯度热应力和钠膨胀化学应力共同作用条件下,获得了工业槽焙烧、启动后槽壳的变形位移数值.用机械式位移计对350 kA石墨化阴极工业电解槽变形进行了长达360 d的现场测试和监测,模拟值与实测值吻合.

Abstract: Deformations in the cathode and on the shell of aluminum reduction cells were systematically investigated in laboratory and industrial cells. The sodium expansion coefficient was obtained from test data. Numerical simulation was utilized to study the stress fields of the cathode and the shell, which took not only the sodium expansion chemical stress but also the temperature gradient thermal stress into account. The displacements of the shell during cell heating treatment and after start-up were acquired. The deformation on the shell of a 350 kA cell with the graphitized cathode has been monitored and measured for 360 d with a mechanical displacement meter. It is found that the simulation values are in good agreement with the measured ones.