[China Aluminum Network] As we all know, the aluminum processing industry's energy consumption is mainly concentrated on the power consumption of electrolytic aluminum. Those who are familiar with electrolytic aluminum production know that the current DC power consumption of the electrolytic aluminum industry in China is more than 13,000 kWh/t-Al, and it is not easy to rely on the original technology to achieve the 12500 kWh/t-Al index. The energy saving and consumption reduction of electrolytic aluminum is a problem that the industry has been working on and solving. This year, there is a new electrolytic tank energy-saving technology researched and developed by Chinalco Zheng Research Institute. If the electricity price is calculated at 0.32 yuan/kWh, companies that use this energy-saving technology can add up to 64 million yuan in direct economic benefits each year, and the emission reduction equivalent CO2 is about 20. Ten thousand tons, about 6 million yuan per year of carbon trading. To this end, China Aluminum Corporation listed this technology as a technology for the overall promotion of the company's electrolytic aluminum section. A total of 536 electrolytic tanks in 8 electrolytic aluminum enterprises have been identified for the promotion and application of this technology. At present, 129 units have been started, and the rest 407 Taiwan will start gradually in the second half of the year.
It is reported that the energy saving technology of the new steady-flow heat-insulating aluminum electrolytic cell is optimized through the optimization of cathode steady flow, voltage balance optimization, thermal field design optimization, and matching and optimization of process parameters. It is matched with building furnace specifications, later-stage management specifications, and on-site service guidance. The company's energy saving and consumption reduction has made important contributions. The technology has four major innovations:
First, it breaks through the technical difficulties of low-voltage and low-efficiency of traditional aluminum electrolysis, and for the first time realizes high-efficiency and stable operation of aluminum electrolytic cells at low voltage.
Second, established a steady flow mode for the optimal combination of aluminum liquid, cathode carbon block, steel bar and assembly, eliminating current concentration and thermal stress concentration in the cathode, bottom pressure drop, furnace bottom temperature, steel window temperature, steel rod head The temperature and the deformation of the shell are relatively stable with time and have longevity characteristics. The current distribution of the cathode aluminum liquid and the cathode carbon block is optimized, the current distribution in the aluminum liquid and the cathode carbon block is more uniform, the vertical current density current of the cathode carbon block in the middle seam position increases by 2.9%, and the vertical current at the output end decreases by 32.7%. .
Thirdly, the energy balance design concept of the electrolytic cell has been innovated, and more attention has been paid to the position, material selection, and regional energy matching of the primary temperature isotherm of the electrolyte in the lining material, so as to ensure that the cathode carbon block will not be subject to freezing damage. The insulation material will not be damaged, which will not only reduce the heat dissipation at the bottom of the electrolytic cell, but also protect the service life of the tank.
4. For the first time, a steady-state high-conductivity steel bar was developed. The normal-temperature conductivity was increased from 4.03 m/Ω·mm2 to 9.45 m/Ω·mm2.
In the 2016 Non-ferrous Metals Industry Science and Technology Awards, the new energy-saving technology for steady-flow heat-insulated aluminum electrolyzer won the first prize, and successfully selected the “Top Ten Carbon Reduction Cases†of aluminum company.
The transformation and upgrading of the energy-saving and consumption-reducing technology of the electrolyzer has been the target of the aluminum processing industry at home and abroad in recent years. For example, Weiqiao Aluminium “NEUI600KA High-Efficiency Aluminum Electrolysis Cell Technology Development and Industrial Applicationâ€, which won the 2016 China Nonferrous Metals Industry Science and Technology Award, also received active cooling and heat recovery technologies from GOODTECH electrolyzers in Norway. . It is through the energy saving transformation of the electrolysis cell to achieve the effect of energy saving and environmental protection.
It is expected that the technology development of energy saving and consumption reduction in the future aluminum electrolysis plant will accelerate development.
Heilongjiang Junhe Building Materials Technology Co., Ltd , https://www.junhejiancai.com