铝电解槽侧部余热高效回收技术工业试验研究

在双碳战略背景下,高效回收利用铝电解槽余热是铝电解产业实现深度节能、降碳的实施路径之一。针对铝电解槽槽壳侧部散热体量大、稳定性好等特点,开发铝电解槽侧部余热高效回收技术,在1台200kA试验槽上开展了工业试验。试验结果表明:铝电解槽余热回收系统整体运行稳定、高效,系统平均回收热量77734 kJ/h,折合每小时回收21.59kW,合吨铝回收317kWh,热回收效率99.71%。该系统能够优化规整炉膛,有利于铝电解槽长寿命、高效、稳定生产运行,为下一步实现铝电解槽柔性生产技术快速能量平衡调整提供了技术支撑。

Industrial Experimental Study on High Efficiency Recovery Technology of Side Waste Heat in Aluminum Electrolytic Cells

In the context of the dual carbon strategy, efficient recycling and utilization of waste heat from aluminum electrolysis cells is one of the implementation paths for the aluminum electrolysis industry to achieve deep energy conservation and carbon reduction. In response to the characteristics of large heat dissipation volume and good stability on the side of the aluminum electrolysis cell shell, an efficient heat recovery technology for the side of the aluminum electrolysis cell was developed, and industrial tests were conducted on a 200kA test cell. The experimental results show that the overall operation of the aluminum electrolysis cell waste heat recovery system is stable and efficient, with an average heat recovery of 77734 kJ/h, equivalent to 21.59 kW per hour, 317 kWh per ton of aluminum, and a heat recovery efficiency of 99.71%. This system can optimize and regulate the furnace, which is conducive to the long-term, efficient, and stable production operation of aluminum electrolysis cells. It provides technical support for the next step of achieving rapid energy balance adjustment of flexible production technology for aluminum electrolysis cells.