New electrolytic cell energy-saving technology can reduce the average power consumption per ton of aluminum by more than 500 kWh

“The aluminum aluminum aluminum aluminum consumes more than 500kWh, the DC energy consumption reaches about 12500kWh/t-Al, and the current efficiency reaches 92%~94%.” Those who are familiar with electrolytic aluminum production know that China's current electrolytic aluminum industry consumes more DC power. Above 13,000 kWh/t-Al, it is not easy to rely on the original technology to achieve the 12500 kWh/t-Al index, but it is not difficult to apply the “new type of steady flow and heat insulation aluminum cell energy saving technology” independently researched and developed by China Aluminum Zhengzhou Research Institute.

In 2017, the Zhengzhou Research Institute ushered in a good time for the application and promotion of energy-saving technical achievements in aluminum reduction cells. Many companies from all over the country took the initiative to observe, investigate, and seek cooperation. They showed great interest in the energy-saving effect of energy-saving technologies in aluminum electrolyzers. By the end of the first half of the year, they have signed technical service contracts for the promotion of results with 8 companies. Facing a gratifying development trend, Fan Dalin, executive director and party secretary of the Zhengzhou Research Institute, said: “Tiandao rewards diligence, and 2017 is a year in which the Institute has been accumulating for a long time.” New energy-saving technology for steady-flow heat-insulation aluminum electrolyzers Many major scientific and technological achievements, such as "Resue Treatment Technology," have been actively promoted and applied in companies and industries."

In recent years, guided by the five development concepts of “innovation, coordination, green, openness, and sharing”, Zhengzhou Research Institute is committed to green environmental protection and sustainable development of electrolytic aluminum production, continuously increasing research and development investment, and accelerating the pace of independent innovation. The backbone force has developed a new generation of energy-saving technology for electrolytic aluminum production - "a new type of energy-saving technology for steady-flow heat-insulation aluminum electrolyzers." This technology mainly improves the cathodic group material, specification, structure and improved cathode lining materials and structures, reduces the cathode cathode pressure drop and the horizontal current of the cathode aluminum liquid layer, improves the operation stability of the electrolytic cell, and balances and stabilizes the aluminum liquid from the voltage. Reducing the polar distance to achieve low-voltage and high-efficiency operation of the electrolytic cell; improving the thermal insulation performance of the cathode lining, optimizing the distribution of the isotonic line of the cathode lining, and improving the thermal state of the electrolytic cell; reducing the power input and heat loss of the electrolytic cell from The energy balance scientifically supports the electrolyzer to obtain high electric efficiency and achieve substantial energy savings.

High energy efficiency, strong adaptability, energy saving and consumption reduction are the fundamental reasons why the new energy-saving technology for steady-flow heat-insulated aluminum reduction cells has become popular in the industry. Since 2014, this technology has been applied in more than 400 electrolyzers in many companies including Yongdeng Aluminum, Liancheng Aluminum, Huaze Aluminum, Zhongfu Aluminum, Lanzhou Aluminum, and Linfeng Aluminum. The electrolytic aluminum production capacity has reached 400,000 tons, and compared with before adopting new technologies, the electricity consumption per ton of aluminum has decreased by more than 500 kWh. For example, after Yongde Aluminum's 54 240kA series electrolyzers adopt this technology, the average power consumption per ton of aluminum is reduced from 13030 kWh/t-Al to 12170 kWh/t-Al, down by 860 kWh; 33 500kA series electrolyzers in Liancheng Aluminum After adopting this technology, the average electricity consumption per ton of aluminum decreased from 13200 kWh/t-Al to 12554 kWh/t-Al, a drop of 646 kWh. For another example, in Zhongfu Aluminum, a total of 153 electrolyzers adopt the new energy-saving technology for steady flow and heat insulation aluminum electrolyzers. The average power consumption per ton of aluminum in 82 400 kA electrolyzers is reduced from 13,050 kWh/t-Al to 12,243 kWh/t-Al. , a drop of 507 kWh; 71 320kA series electrolytic tanks were reduced from 13150 kWh/t-Al to 12465 kWh/t-Al, down 685 kWh.

If the electricity price is calculated at 0.32 yuan/kWh, the above-mentioned enterprises that have adopted the new energy-saving technology for steady-flow heat-insulated aluminum electrolytic tanks can accumulate annual direct economic benefits of 64 million yuan, and the equivalent CO2 emissions can be reduced by about 200,000 tons. 6 million yuan/year carbon trading volume. The technology was highly evaluated by experts in the non-ferrous metal industry. In the 2016 Non-ferrous Metals Industry Science and Technology Awards, the new energy-saving technology for steady-flow heat-insulated aluminum electrolyzers won the first prize; and it successfully selected the first carbon reduction company for aluminum. Great case."

In 2017, given the significant energy-saving features of the new energy-saving technology for steady-flow insulation aluminum electrolyzers, China Aluminum Corporation listed this technology as the only technology to be fully promoted in the company's electrolytic aluminum sector, with a total of 536 units in eight electrolytic aluminum enterprises. The electrolytic cell has been determined to popularize and apply this technology. At present, it has started 129 sets, and the remaining 407 sets will start gradually in the second half of the year. In anticipation of the prospects for the application of energy-saving technologies for new-type steady-flow heat-insulated aluminum reduction cells, Shi Zhirong, general manager of the Zhengzhou Research Institute, is full of confidence: “Currently, the energy-saving technology for new-type steady-flow heat-insulated aluminum electrolytic cells developed by our institute has become the industry aluminum. It is the technical center of Chinalco that we have the obligation to take up the banner of scientific and technological innovation, take advantage of the situation, overcome difficulties, and strive to achieve greater morale. Excellent results to the 19th Party Congress."