Electrolytic aluminum energy saving new ideas

[China Aluminum Industry Network] Grasping the pulse of electrolytic aluminum consumption reduction Based on the domestic electrolytic production system, it analyzes the drawbacks of the existing production processes, absorbs the experience of foreign advanced electrolytic aluminum production process systems, and carries out technological innovations, based on the primary crystal temperature of the electrolyte. The new electrolytic production process that controls the degree of superheating is an effective means to change the current status of low current efficiency and poor production efficiency, and has grasped the “pulse” of saving energy and reducing consumption of electrolytic aluminum.
Today's foreign advanced electrolytic aluminum plants adopt high-electrolyte temperature, high electrolyte primary crystal temperature, low superheat, high cell stability, low voltage, low effect, high current efficiency aluminum electrolytic cell process operating technology, and domestic electrolysis The aluminum plant still uses traditional low-temperature, low-electrolyte-molecule ratios to increase current efficiency and organize production.
Experimental studies have shown that low-temperature, low-molecule-ratio processes do have the effect of reducing the solubility and dissolution rate of aluminum in electrolyte solutions, reducing aluminum losses, and improving current efficiency. However, the low temperature and low molecular ratio make the electrolyte composition and thermal stability greatly reduced, and it is easy to produce precipitation, resulting in disadvantages such as large horizontal current, unstable tank pressure, and many effects. At the same time, it is also easy to reduce the temperature of the electrolytic cell. These disadvantages make low temperature and low temperature. The molecular ratio operation cannot achieve the desired purpose of improving current efficiency. On the basis of continuous process innovation, using advanced electrolytic concepts from abroad, the superheat degree is accepted as a new concept for various domestic aluminum plants.
The superheat degree is the difference between the electrolyte temperature and the primary crystal temperature of the electrolyte. At present, the superheat degree of foreign large-scale prebaked anode electrolyzers is generally 8~10°C, while the superheat of domestic electrolytic cell electrolytes is between 6~20°C, and abroad. The difference is greater. This difference comes from the domestic electrolytic process. The electrolysis process of each electrolysis plant in China adopts a route of controlling the temperature of the molecule rather than controlling the temperature of the tank. The low molecular ratio is used to control the temperature of the tank, the ratio of the electrolyte molecules is low, and the temperature of the primary crystal is low. Increase the degree of superheat to ensure the stable operation of the electrolytic cell, and how to control the appropriate degree of superheat becomes the first problem to be solved in electrolysis production. It has been reported in the literature that for every 10°C reduction in the electrolysis temperature, the current efficiency can be increased by 2-3% on the original basis.
In other words, if China’s electrolytic aluminum plants can effectively control the superheat degree and reduce the superheat to 8~10°C, the bath temperature will also be reduced by 10°C. It can be foreseen that the electrolytic cell efficiency of electrolytic aluminum plants in China will be Break the existing level and rise to a new level. Through the analysis of measured data from multiple electrolysis plants, it is found that when the molecular ratio is used to control the bath temperature, the following occurs: When the molecular ratio is high, the bath temperature is not necessarily high; when the molecular ratio is low, the bath temperature is not necessarily low; At the molecular ratio, the temperature of the controlled tank is quite different. In the process of using the molecular ratio to control the tank temperature, the superheat span is 0.6°C~25.9°C. The main reason is that the primary crystal temperature is difficult to measure directly, which makes it difficult to effectively grasp the state of the electrolytic cell during process control. The newly introduced automatic primary crystal temperature measurement equipment and smart tank temperature measurement instrument is a new type of equipment developed by Beijing Core Power Technology Co., Ltd. for electrolytic aluminum energy management. Using these new types of equipment, it effectively improves the analysis of the superheat of electrolytic cells. Efficiency, reducing analysis errors, has a significant effect on improving energy efficiency.

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