铝电解槽阳极导杆电流波动最频值的实用化测量方法

A practical measurement method for the most frequent value of current fluctuation in anode rod of the aluminum pot

铝电解槽内阳极电流波动的最频值反映了铝液波动的情况。但由于阳极电流的多变性,较难一次性获得最频值。大量实测结果表明,阳极电流波形可分为三类,一类是波动周期比较明显的波形,另一类是没有波动周期的随机波形,第三类是前两类波形的混合波形。周期明显的波形可以方便的获得最频值,而另两类波形能反映一些局部阳极问题。本文通过采用一种LH-80型手持式电流表,方便的获得了这三种类型的曲线信号。并通过采用离散傅里叶变换(DFT)得到的信号最频值,分析了这三种波形信号在判断电解槽稳定性方面的作用。

The most frequent value of the anode current fluctuation in the aluminum pot reflects the fluctuation of the aluminum liquid.However,due to the variability of the anode current,it is difficult to obtain the maximum frequent value at one time.A large number of actual measurement results show that the anode current waveform can be divided into three categories,one is a waveform with a relatively obvious fluctuation period,the other is a random waveform without a fluctuation period,and the third type is a mixed waveform of the first two types of waveforms.The waveform with obvious period can easily obtain the most frequent value,while the other two types of waveforms can reflect some local anode problems.This paper uses an LH-80 handheld ammeter to conveniently obtain these three types of curve signals.By using the most frequent value of the signal obtained by discrete Fourier transform(DFT),the role of these three waveform signals in judging the stability of the aluminum pot was analyzed.