ã€China Aluminum Network】
Seize the key to energy saving of electrolytic aluminum With the advancement and development of new energy-saving technologies in the electrolytic aluminum industry, the use of primary crystal temperature to control the status of the electrolytic cell is more intuitive and simple compared to traditional production control systems. This has been achieved in the electrolytic aluminum industry. Broad recognition. Grasping the temperature and superheat of primary crystals is the key to seizing the "eyes" of electrolytic aluminum production.
Although China's electrolysis industry started late, it has developed rapidly; the electrolysis process system that is currently used is to use molecular ratio to control the temperature of the electrolyzer, use the molecular ratio as a control basis, and by measuring the molecular ratio, the molecular ratio is converted to the primary crystal temperature. , Then use the primary crystal temperature to calculate the tank temperature data, and then stabilize the tank temperature by adding materials. This process system has certain drawbacks. First, the accuracy of the tested molecules is not guaranteed. After a long period of experimentation, we found that the temperature of the primary crystal obtained from testing the ratio of the electrolyte molecules is not very accurate, and sometimes the deviation is very large. Usually, the error is about 10°C. Secondly, the molecular ratio is used to obtain the primary crystal temperature. It is easy to introduce human error; the molecular ratio is not directly proportional to the temperature of the primary crystal, and there are various impurities and additives that make the primary crystal temperature inaccurate. Later, in the control process, in order to ensure the stable operation of the electrolytic cell, the segregation between the bath temperature (electrolyte temperature) data is large.
Direct measurement of the primary temperature of the electrolyte is the key to solving this problem. Due to the complexity of the electrolyte composition, it is difficult to directly measure the primary crystal temperature, and the primary crystal temperature measurement method based on the step cooling curve principle has the advantages of being intuitive and accurate.
Precise measurement of electrolyte primary crystal temperature and electrolyte temperature can accurately obtain the superheat of the electrolytic cell. Due to the constraints of traditional process conditions, there are problems in the measurement of the primary crystal temperature and the electrolyte temperature, which affects the judgment of the superheat of the electrolytic cell.
With the advancement of primary crystal temperature measurement technology, large-scale measurement of primary electrolyte temperature has become simple, easy, and economical. The primary crystal temperature value of electrolyte has been introduced into the electrolytic aluminum control system, and an electrolytic production system with the goal of superheat control of the electrolytic cell has been established. It has direct significance for further improving the current efficiency of electrolytic aluminum and reducing the electricity consumption per ton of aluminum. The automatic primary crystal temperature measurement system developed by Beijing Core Power Technology Co., Ltd. improves the measurement process based on the step cooling curve principle, improves the accuracy, simplifies the measurement process, shortens the measurement time, and the measurement error is ≤±1.5°C. The test cost is low. It has been widely used in electrolytic aluminum enterprises, laying a solid foundation for large-scale measurement of primary electrolyte temperature in industrial production, and providing technical means for improving current efficiency, stabilizing cell conditions, and improving cell lifetime.
The development and competition of the aluminum industry is mainly manifested in the competition of technology and cost. Energy-saving emission reduction, cost reduction and efficiency increase are the necessary conditions for aluminum companies to stabilize the market and continue to develop. For this reason, we urgently need to study a new set of technological system to achieve good technical and economic indicators and maintain the stability of the electrolytic cell in the production process of aluminum electrolysis. Through the primary crystal temperature to adjust the production process conditions, control the tank temperature, to maintain the superheat degree between 8 ~ 10 °C, so that the electrolytic tank to form a good groove gang shell, promote the electrolysis tank material balance and energy balance, compared to the end The stability of the electrolyte composition and the stability of the electrolysis temperature improve the current efficiency and reduce the power consumption. The stability of the heat balance can also increase the life of the electrolytic cell.
Effectively and accurately measure the primary crystal temperature of the electrolyte and the temperature of the electrolytic cell to obtain a true and accurate degree of superheat; use the temperature of the primary crystal of the electrolyte to adjust the superheat degree of the electrolytic cell, maintain the material balance and energy balance of the electrolytic cell, and control the temperature of the electrolytic cell, Stable conditions, to achieve the purpose of enterprises to reduce costs and increase efficiency; and finally establish a set of primary crystal temperature control electrolytic production, energy saving and new electrolytic process system.
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