Noise Classification in the Aluminum Reduction Process

Banta, Larry E.; Dai, Congxia; Biedler, Philip L.

doi:10.1002/9781118647851.ch121

Cited by 2 publications

(7 citation statements)

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“…Three different types of voltage noise occur in the electrolysis cell. Bubble noise or fluctuating noise occurs due to the production of CO2 bubbles on the anodes as a necessary and inevitable part of the electrolysis process [45][46][47][48]. Short-circuiting noise or pulsating noise occurs due to a temporary shortening caused by molten metal splashing against the bottoms of the anodes [45][46][47][48].…”

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

“…Bubble noise or fluctuating noise occurs due to the production of CO2 bubbles on the anodes as a necessary and inevitable part of the electrolysis process [45][46][47][48]. Short-circuiting noise or pulsating noise occurs due to a temporary shortening caused by molten metal splashing against the bottoms of the anodes [45][46][47][48]. Metal pad motion or wavy noise occurs due to vigorous metal movement in the cathode cavity, resulting in changes of the actual ACD [45][46][47][48].…”

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

“…Short-circuiting noise or pulsating noise occurs due to a temporary shortening caused by molten metal splashing against the bottoms of the anodes [45][46][47][48]. Metal pad motion or wavy noise occurs due to vigorous metal movement in the cathode cavity, resulting in changes of the actual ACD [45][46][47][48].…”

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

“…Bubble noise is not a concern for cell operation and has little effect on the current efficiency and power demand of the electrolysis process [45][46][47][48]. Current efficiency is reduced and power demand is increased by both the anode short-circuiting noise and the metal pad roll noise [45][46][47][48].…”

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

See 3 more Smart Citations

Review of measures for improved energy efficiency in production-related processes in the aluminium industry – From electrolysis to recycling

Haraldsson

Johansson

2018

Renewable and Sustainable Energy Reviews

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The aluminium industry is facing a challenge in meeting the goal of halved greenhouse gas emissions by 2050, while the demand for aluminium is estimated to increase 2-3 times by the same year. Energy efficiency will play an important part in achieving the goal. The paper's aim was to investigate possible production-related energy efficiency measures in the aluminium industry. Mining of bauxite and production of alumina from bauxite are not included in the study. In total, 52 measures were identified through a literature review. Electrolysis in primary aluminium production, recycling and general measures constituted the majority of the 52 measures. This can be explained by the high energy intensity of electrolysis, the relatively wide applicability of the general measures and the fact that all aluminium passes through either electrolysis or recycling. Electrolysis shows a higher number of emerging/novel measures compared to the other processes, which can also be explained by its high energy intensity. Processing aluminium with extrusion, rolling, casting (shape-casting and casting of ingots, slabs and billets), heat treatment and anodising will also benefit from energy efficiency. However, these processes showed relatively fewer measures, which might be explained by the fact that to some extent, these processes are not as energy demanding compared, for example, to electrolysis. In many cases, the presented measures can be combined, which implies that the best practice should be to combine the measures. There may also be a future prospect of achieving carbon-neutral and coal-independent electrolysis. Secondary aluminium production will be increasingly important for meeting the increasing demand for aluminium with respect to environmental and economic concerns and strengthened competitiveness. Focusing on increased production capacity, recovery yields and energy efficiency in secondary production will be pivotal. Further research and development will be required for those measures designated as novel or emerging.

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Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

Section: Cell Voltage Noise Reductionmentioning

confidence: 99%

See 2 more Smart Citations

Review of measures for improved energy efficiency in production-related processes in the aluminium industry – From electrolysis to recycling

Haraldsson

Johansson

2018

Renewable and Sustainable Energy Reviews

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show abstract

“…As the cell becomes larger in size, the number of anodes in the cell is more than 40, due to the various physical and chemical changes, any local changes will cause the change of cell resistance. The changes of CV and anode current distribution mean that the cell resistance changes [3]. As a result, the CV and anode current are usually used to diagnose the cell working conditions.…”

Section: Introductionmentioning

confidence: 99%

Simulation Method Based on Equivalent Circuit to Investigate the Circuit Characteristics in Aluminum Reduction Cell

Wang

Tie

Sun

et al. 2014

Trans Indian Inst Met

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In this paper, on the basis of simulation on the electric field of aluminum reduction cell, the simulation signals of cell voltage (CV) and anode currents were obtained through simulating the cell equivalent circuit which was established using Matlab/Simulink software. Several cell conditions, including potline current fluctuation, anode changing, low anode-cathode distance, metal pad contacting with anode surface and local anode effect, were simulated using this model. These obtained simulation data were analyzed comprehensively by time domain, frequency domain, and other statistical methods, such as skewness, and kurtosis. This study further demonstrates that the individual anode current can provide more information on local cell conditions. Different cell conditions produce different characteristics of CV and anode current in time domain or frequency domain, skewness and kurtosis are more sensitive to the change of signals.

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Noise Classification in the Aluminum Reduction Process

Cited by 2 publications

References 0 publications

Review of measures for improved energy efficiency in production-related processes in the aluminium industry – From electrolysis to recycling

Review of measures for improved energy efficiency in production-related processes in the aluminium industry – From electrolysis to recycling

Simulation Method Based on Equivalent Circuit to Investigate the Circuit Characteristics in Aluminum Reduction Cell

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