铝电解槽电-热场强耦合建模计算方法

Method of strongly coupled modeling and computing for thermal-electrical field in aluminium reduction cells

指出广泛使用的铝电解槽电-热场分离的计算方法和电-热场弱耦合计算方法的理论缺陷,提出一种电-热场强耦合计算模型。以某420 kA铝电解槽为对象,同时应用强耦合模型与传统的弱耦合模型对其电-热场进行计算,计算结果证明了在电-热场分析中采用强耦合模型的必要性。研究结果表明:不设定熔体温度是电场和热场实现强耦合的关键,对槽内各热源进行准确描述并引入计算模型中是获得可靠的铝电解槽电-热场分布的必要条件。

The theoretical defects of the widely adopted separation calculation method and weakly coupled calculation methods for the thermal-electrical field in aluminium reduction cells were pointed out, and a strongly coupled model of thermal-electrical field was presented. The thermal-electrical field of a 420 kA aluminium reduction cell was computed by using the strongly coupled model and the conventional weakly coupled model, respectively, and the results of this comparative computation prove that adopting the strongly coupled model is necessary. The results show that not setting the temperature of the melt is the key to realize the strong coupling of the electrical field and thermal field, and that introducing the each heat source, which are exactly described, into the calculation model is requirement for obtaining the reliable distribution of the thermal-electrical field.