400kA电解槽热场平衡及分析

利用多点热流计(HFM-215)和烟尘平行采样仪(TH-880F)对正常运行的两台400kA电解槽进行了热平衡测试,结合电解槽能量平衡理论与相关热量计算方法,对电解槽能量平衡情况进行了计算和分析。结果表明:400kA电解槽的侧部槽壳熔体区温度在195.1℃～308.8℃之间,不存在温度过高的区域,说明电解槽的侧部炉帮形成较好;槽底温度在55.5℃～116℃之间,整体保温较好;电解槽热平衡部分多余热量的60%以上从电解槽上部随烟气或槽盖板处散出,使槽壳的散热压力降低,有利于形成较好的炉帮,有利于电解槽高效稳定运行。400kA电解槽由于可在工作电压较低(约为3.91V)的条件下运行,能量利用率较高,约为49.02%。

Analysis of heat balance for 400kA pots

Heat flow meter and flue dust sampling instrument have been used in heat field test at pot shells,gas collecting tube,anode rod,cathode steel bar and pot cover board of two 400kA pots in normal operation.The values of energy input and output have been calculated in detail combining energy balance theory of the pot and the related calculation method.Thus,temperature and energy distribution of the pots are analyzed.Results show that temperature of the pot shell is decreased from the location of melt,cathode to the lining.And the temperature is among 195.1℃~308.8℃.No high temperature point is existed in this area.It can be concluded that good electrolyte incrustation are formed at the lateral shell.Besides,although heat preservation of the bottom part is not bad,temperature is among 55.5℃~116℃.What is more,higher energy utilization are received at 400kA pots,about 49.02%.It is due to a lower pot voltage,about 3.91V,is used in the pots.Meanwhile,more than 60% of the unnecessary heat is emitted from upper part by flue gas or cover boards,which means that less heat need to be emitted from the shell.Thus,better electrolyte incrustations are more likely to formed on the shell,which are benefit for the pot operation.