摘要
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。针对铝电解槽侧部余热回收困难的技术瓶颈问题,开发电解槽侧部余热回收专用换热模块,优化调控模块换热介质流量,调控取热速率,在不影响电解槽稳定运行状态条件下,高效回收电解槽槽壳侧部辐射热。在1台200 kA试验槽上开展的工业试验结果表明: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77 734 kJ/h,折合每小时回收热量21.59 kW,吨铝回收热量317 kWh,热回收效率99.71%。系统实现了回收热量在18.44~21.59 kW/h内稳定、高效、精准调控,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。
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 technical bottleneck problem of difficult recovery of waste heat on the side of aluminum electrolytic cells,a dedicated heat exchange module for waste heat recovery on the side of the electrolytic cell has been developed.The flow rate of the heat exchange medium in the module has been optimized and controlled,and the heat extraction rate has been adjusted to ensure stable operation of the electrolytic cell without affecting it.The radiant heat on the side of the electrolytic cell shell has been efficiently recovered.The technology was tested in an industrial scale on a 200 kA test cell and the results showed that the overall operation of the aluminum electrolysis cell waste heat recovery system was 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%.The system has achieved stable,efficient,and precise regulation of heat recovery within the range of 18.44-21.59 kW/h,and can optimize and regulate the furnace,which is conducive to the long-term,efficient,and stable production operation of aluminum electrolysis cells.
作者
张阳
张亚楠
于强
梁贵生
关月超
ZHANG Yang;ZHANG Yanan;YU Qiang;LIANG Guisheng;GUAN Yuechao(Liancheng Branch of CHALCO,Lanzhou 730335,China;Zhengzhou Non-ferrous Metals Research Institute Co.Ltd.of CHALCO,Zhengzhou 450041,China)
出处
《有色金属工程》
CAS
北大核心
2023年第8期78-83,160,共7页
Nonferrous Metals Engineering
基金
2021年中国铝业股份有限公司科技研发项目(中铝股份科发字[2021]153号)。
关键词
铝电解
余热回收
侧部余热
热回收效率
aluminum electrolysis
waste heat recovery
side waste heat
heat recovery efficiency
