Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第2期    总第203期    2016年2月

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文章编号:1004-0609(2016)02-0430-09
铝电解槽下料过程对电解质温度场的影响
丁培林1,王恒1,黄俊2,王紫千2,曹斌2

(1. 华中科技大学力学系,武汉430074;
2. 贵阳铝镁设计研究院有限公司技术研发中心,贵阳550081
)

摘 要: 铝电解槽内保持良好的热平衡可以减少铝电解过程中的能耗,而氧化铝周期性的下料会破坏电解槽热平衡。建立铝电解槽电解质浓度-热场瞬态模型,在精确模拟氧化铝浓度分布的基础上,研究下料期间电解质温度及热平衡的变化趋势。结果表明:氧化铝下料时,电解质极距层局部温度降低5 ℃左右,上表面附近区域最多降低十几度;下料结束20 s内,逐渐恢复到正常温度;氧化铝下料会打破电解质内的热平衡,其中部分热量(最高达300 kW)用来加热氧化铝颗粒;20 s后,电解质会达到新的热平衡状态。

 

关键字: 铝电解槽;氧化铝浓度分布;浓度;热场;热平衡

Effect of feeding in aluminum reduction cell onelectrolyte temperature
DING Pei-lin1, WANG Heng1, HUANG Jun2, WANG Zi-qian2, CAO Bin2

1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;
2. Guiyang Aluminum-Magnesium Design and Research Institute Co., Ltd., Guiyang 550081, China

Abstract:Keeping good heat balance in the aluminum reduction cell can decrease the energy consumption in the process of aluminum electrolysis, but the feeding can destroy the heat balance. The transient model of alumina concentration and thermal field in cell was established. Based on the accurate simulation of the alumina concentration distribution, the temperature and heat balance were studied. The results show that the local electrolyte temperature decrease about 5 ℃in the electrolyte space layer and the dozen degrees around the bath surface, and gradually restored to the original temperature after 20 s. The feeding can break the heat balance of the cell, and heat at 300 kW is used to heat the alumina particles. After 20 s, the cell reaches a new heat balance state.

 

Key words: aluminum reduction cell; alumina concentration distribution; concentration; thermal field; heat balance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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