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Extraction method and equipment of apparent aluminum oxide concentration for process control of aluminum electrolysis cell

A process control, aluminum electrolytic cell technology, applied in electrical digital data processing, special data processing applications, complex mathematical operations, etc. Can not clearly distinguish the corresponding relationship between the tank voltage signal and other problems

Active Publication Date: 2018-07-27
CENT SOUTH UNIV
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Problems solved by technology

Therefore, the use of spectrum analysis based on Fourier transform cannot analyze the frequency composition of the tank voltage signal and its variation with time, and cannot clearly distinguish the corresponding relationship between the components of the tank voltage signal and their physical meanings; using Fourier transform Spectrum analysis of non-stationary signals is also prone to false spectral peaks, which in turn affects the accuracy of signal component acquisition related to alumina concentration state information and tank noise[2]

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  • Extraction method and equipment of apparent aluminum oxide concentration for process control of aluminum electrolysis cell
  • Extraction method and equipment of apparent aluminum oxide concentration for process control of aluminum electrolysis cell
  • Extraction method and equipment of apparent aluminum oxide concentration for process control of aluminum electrolysis cell

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[0149] In the following, the sampling frequency of the 400kA aluminum electrolytic cell is f s =0.1Hz to normalize the tank voltage as an example, expand the description.

[0150] 1. Extraction of apparent alumina concentration

[0151] Take any section of normalized tank voltage data with obvious "under-rise and over-fall" law and record it as #1, as shown in Figure 2, there are 6 comprehensive cutting periods in Figure 2(a). The sampling frequency of this segment of data is 0.1 Hz, that is, Δt=10s, and the data length N=1440, that is, four hours of production data. When the aluminum electrolytic cell control machine collects this section of data, it does not have any routine operations such as aluminum discharge, pole change, and busbar lifting, nor does it have any special operations such as anode movement and side processing, nor does it include special cell conditions such as anode effects.

[0152] In Fig. 2, the wavy curve is the normalized tank pressure, the middle a...

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Abstract

The invention discloses an extraction method and equipment of apparent aluminum oxide concentration for process control of an aluminum electrolysis cell. The method comprises the following steps: A, separating normalized bath voltage data with any sample frequency layer by layer to obtain signal components relevant to an aluminum oxide concentration state by means of a multiresolution analysis theory and shift-invariant wavelet transform; B, defining a state characteristic variable relevant to the apparent aluminum oxide concentration state information as the apparent aluminum oxide concentration according to the physical meaning of the signal components relevant to the aluminum oxide concentration state; and C, designing a novel slope by means of the obtained apparent aluminum oxide concentration. Experiments verify that a rate of change of the apparent aluminum oxide concentration is obtained, influence of changing factors, for example, electrolyte components, electrolyzing temperature, polar distance and molten aluminum fluctuation, which cannot be detected in real time on pre-estimation of the aluminum oxide concentration in industrial production can be eliminated greatly, andrelative change of the aluminum oxide concentration is represented relatively well.

Description

technical field [0001] The invention relates to the field of aluminum electrolytic cell process control, in particular to a method and equipment for extracting apparent alumina concentration used in aluminum electrolytic cell process control. Background technique [0002] Cryolite-alumina molten salt electrolysis is the only way for the aluminum electrolysis industry to produce primary aluminum, and the aluminum electrolysis cell is the "heart" of the aluminum electrolysis production process. The raw material used in electrolysis is alumina, the electrolyte is molten cryolite, and a carbon anode is used. The result of electrolysis is molten aluminum on the cathode and carbon dioxide on the anode. Due to the complex electrochemical, physical and chemical reactions involved in the aluminum electrolytic cell, the cryolite-alumina molten salt has the characteristics of high temperature and strong corrosion, so many key parameters cannot be directly measured online. At the same...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20G06F17/14
CPCC25C3/20G06F17/148
Inventor 陈晓方曾朝晖桂卫华谢永芳
Owner CENT SOUTH UNIV
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