Estimating the Alumina Concentration During Aluminum Electrolysis by Identifying the Sensitive Frequency Band Using Marginal Kurtosis
Estimating the Alumina Concentration During Aluminum Electrolysis by Identifying the Sensitive Frequency Band Using Marginal Kurtosis
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DOI：
10.1109/access.2020.3046500
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Zhaohui Zeng;W. Gui;Lihui Cen;Xiaofang Chen;Yongfang Xie
中科院分区：
文献类型：
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作者：
Zhaohui Zeng;W. Gui;Lihui Cen;Xiaofang Chen;Yongfang Xie
对工业铝电解槽中氧化铝浓度进行准确、及时的在线估计，可以提高电解槽的进料控制性能。利用所提出的边际峰度（MK）、边际峰度主频（MK-DF）、积分馈电频率和灵敏频带（SFB），揭示了不同电流强度和馈电方式下的归一化槽电压具有不同的氧化铝浓度SFB，并确定了SFB的一般计算公式。在此基础上，提出了一种利用SFB的上限作为低通滤波器截止频率的准不变滤波获取准氧化铝浓度（PAC）的通用算法。PAC用于估计氧化铝的绝对和相对浓度。使用测定浓度验证绝对浓度。此外，使用相对浓度PAC斜率，提出了工业电池的改进的进料控制性能。
The accurate and timely online estimation of the alumina concentration in an industrial aluminum electrolysis cell can improve its feed control performance. By using the proposed marginal kurtosis (MK), marginal kurtosis dominant frequency (MK-DF), integral feed frequency and sensitive frequency band (SFB), this study reveals that a normalized cell voltage with different current intensities and feed schemes has different alumina concentration SFBs and determines the general formula for calculating the SFB. On this basis, a general algorithm for acquiring the pseudo alumina concentration (PAC) using translation-invariant filtering is proposed in which the upper limit of the SFB provides the cutoff frequency of the low-pass filter. The PAC was used to estimate the absolute and relative concentrations of alumina. The absolute concentrations are validated using measured concentrations. Additionally, improved feed control performance of the industrial cells is presented using the relative concentration PAC-slope.