升降电流对铝电解槽热场、阴极应力场的影响

Effect of Electric Current on Thermal Field and Cathode Stress Field of Aluminum Reduction Cell

为了应对高电价对铝电解行业的冲击,同时根据白天和晚上电价的不同,对铝电解槽的电流强度进行调整(白天降低电流,晚上升高电流)以降低生产成本。本文在黄河鑫业铝厂进行工业测试与试验,通过ANSYS有限元仿真软件分别建立了在不同电流密度下的铝电解槽阴极热应力场模型和铝电解槽单阳极电热场模型,并对其进行了正确性验证。通过考察不同电流强度下的温度场分布、阴极应力,发现低电流强度时对侧部的保温性要求较高,高电流时可以适当的改善底部散热条件,其它部位温度场变化不大;同时在控制温度场的波动下,最大拉应力的差值为0.2MPa,相对于本身拉应力的数量级而言,其影响不明显,阴极应力的变化不会影响正常的生产过程。

To deal with the impact of high electricity price on aluminum electrolysis industry, and based on the day and night differential price, adjustment of the current intensity of aluminum electrolytic cell was done （lower current at daytime and raise current at night ） to reduce production cost. Tests and industrial trial for this paper were done in Huang He Xin Ye aluminum plant. Meanwhile, cathode thermal stress field model and single anode electric-thermal field model of aluminum electrolytic cell under different current strength were established by using ANSYS finite element simulation software, and their correctness was verified. Through investigation of temperature distribution and cathode stress under different current intensity, it is found that lower current requires better thermal insulation side, and higher current needs appropriately improved bottom cooling condition, while other parts of the temperature field changed slightly. At the same time, when the controlled temperature field changes, the difference of maximum tensile stress is 0.2MPa, and compared with its own stress, the effect is subtle, thus the change of cathode stress will not affect production process.