铝电解质过热度的快速测量方法——差热升温法

Fast Measurement on Superheat of Aluminum Electrolyte by Using Differential Thermal Analysis Method

电解质过热度是指电解质温度与电解质初晶温度的差。铝电解质过热度的快速测量对铝电解槽高效稳定生产具有重要的意义。在综述前人工作基础上,本文基于差热升温法原理研制了一种新的过热度测量传感器。用差热升温传感器对某厂400kA铝电解系列4台电解槽进行现场测试,快速测量了电解质的过热度和电解温度。并在实验室用步冷曲线法对现场电解质样品进行初晶温度测量,结果表明,差热升温法测量的结果和步冷曲线法测量的结果一致,误差小于±2℃。该方法将取代现有电解槽测温方法,在测温的同时,直接将电解质初晶温度和过热度测量出来,通过过热度控制,实现铝电解槽的高效节能。

The bath superheat is the temperature difference between the liquidus temperature of the bath and bulk of the bath. Fast measurement of bath superheat is meaningful for highly efficient and stable of aluminum reduction cells. This paper reviews the development of fast measurement methods for bath superheat and presents a new probe for fast measurement of bath superheat based on the principle of Differential Thermal Heating Analysis （DTHA）. The DTHA probe was tested in four 400 kA cells. The bath superheats and temperatures obtained with DTHA probe a- gree with that of thermal analysis method carried out in the lab with error less than ±2 ℃. The new method with DTHA probe will replace the current method for bath temperature measurement because liquidus temperature and su- perheat can be obtained simultaneously during bath temperature measurement. Better control of superheat is helpful in achieving the energy saving and efficient in aluminum reduction cells.