A method for controlling alumina concentration based on aluminum electrolytic cell
A technology of aluminum electrolytic cells and control methods, applied in the field of adaptive control, can solve problems such as inapplicability of precise control, existence of noise, large measurement errors in data measurement, etc., to achieve accurate and real-time control of input, improve test accuracy, and precise control Effect of alumina concentration
Active Publication Date: 2018-04-20
CHONGQING UNIV
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Problems solved by technology
The fuzzy reasoning control method is to collect the working state parameters of the electrolyzer and control the feeding. This method has large errors and is not suitable for precise control.
[0005] In addition, in the field of correlation density measurement, there are errors and noises in the measurement of existing density sensors; at the same time, the conventional practice of digital filtering is to calculate the average value, and there are large measurement errors in the measurement of real-time changing data
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[0037] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0038] Such as figure 1As shown, a method for controlling the concentration of alumina based on an aluminum electrolytic cell provided in this embodiment includes the following steps:
[0039] S1: Model establishment; model establishment includes: S11 establishment of electrolyte density / concentration relationship curve, S12 establishment of electrolyte density / temperature compensation curve; SA1 establishment of volatility index / temperature curve;
[0040] S2: The density sensor collects the sampling density of the electrolyte and sends it to the control unit; the temperature sensor collects the sampling temperature of the electrolyte and sends it to the control unit;
[0041] S3: S31 control unit performs digital filtering on the sampling density to filter abnormal collection points; S32 calculates the weighted mean value of the filtered sampling density; ...
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The invention discloses an aluminum oxide concentration control method based on an aluminum electrolytic cell. The method comprises the following steps that a model is firstly built; then the electrolyte sampling density and sampling temperature are collected; digital filtering is carried out on the sampling density, density compensation is carried out based on the temperature after the weighted mean of the sampling density is calculated, and an equivalent density value is obtained; a control unit obtains an aluminum oxide concentration value according to a concentration / density relation curve; and finally the control unit controls a cell control machine to carry out feeding towards the electrolytic cell according to the aluminum oxide concentration. According to the novel aluminum oxide concentration monitor method, compared with the prior art, the material input quantity can be controlled precisely in real time, and the aim of precisely controlling the aluminum oxide concentration is achieved.
Description
technical field [0001] The invention relates to the field of adaptive control, in particular to an alumina concentration control method based on an aluminum electrolytic cell. Background technique [0002] Electric energy consumption is the largest energy consumption in the production process of electrolytic aluminum. As the price of electricity is getting higher and higher, its proportion in the cost of aluminum is increasing. Therefore, reducing the power consumption of electrolytic aluminum is the key to reducing the aluminum An effective way to reduce the cost of ingots and increase economic benefits is also a key national research topic. [0003] The aluminum electrolysis process is accompanied by complex electrochemical reactions, complex material and energy conversion, extremely harsh production environment, unclear production process mechanism, and difficult to establish mathematical models; and the production process is highly nonlinear, with large disturbances and ...
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IPC IPC(8): C25C3/20
CPCC25C3/20
Inventor 尹刚尹艺臻李卓蔓沈重衡尹俊皓尹冬尹松白家扬尹平尹在之张艳怡
Owner CHONGQING UNIV