Bubble driven flow in narrow channels between the electrodes of an aluminium electrolysis cell

铝电解槽电极之间狭窄通道中的气泡驱动流

• 批准号: 250454-2011
• 负责人: Kiss, Laszlo
• 金额: $ 2.19万
• 依托单位: Université du Québec à Chicoutimi
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=509972
• 关键词: Bubble; driven; flow; narrow; channels

Today's production technologies consume about twice of the electrical energy needed theoretically to reduce alumina into metallic aluminum. An important part of the excess energy is dissipated in the molten electrolyte during the passage of the electrical current. The gas bubbles that are generated during the electrochemical reduction of alumina occupy a part of the horizontal interelectrode space and increase the electrical resistance provoking a parasite heat generation. One method of reducing that excess heating is by reducing the interelectrode space, the so-called anode-cathode distance, ACD. However, the thickness of the bubble layer under the anode sets a limit to the reduction of the ACD as the bubbles can perturb the electrolyte-metal interface, causing a reduction in the current efficiency of the electrolysis cell.

当今的生产技术在理论上消耗了大约两次电能，以将氧化铝降低到金属铝中。在电流通过期间，在熔融电解质中散发了多余能量的重要部分。氧化铝的电化学还原过程中产生的气泡占据了水平互电极空间的一部分，并增加了引发寄生虫热产生的电阻。 减少过量加热的一种方法是减少互电去的空间，即所谓的阳极阴极距离ACD。但是，由于气泡会扰动电解质 - 金属界面，因此气泡层的厚度设定了ACD还原的限制，从而导致电解电池的电流效率降低。