The main research and development contents and innovative technologies of this project are as follows:
1. The simulation study of "physical field" of aluminum electrolyzer has reached the international advanced level, among which: 1 Electromagnetic cell "magnetic field" design uses strong compensation around the slot, weak compensation at the bottom of the slot, and local compensation of the bus at the end of the slot. Vertical magnetic field comparison The large value of │Bz│max is 13.575Gs, and the vertical magnetic field average │Bz|ave is 5.182Gs; 2 The electrolytic lining adopts a new type of carbonized silicon+carbon block, dry impervious material and high-graphite cathode. The material, the electrolytic cell "hot field" simulation results have the obvious characteristics of bottom insulation, side heat dissipation. 2. The busbar design around the electrolyzer adopts six-point uniform power feeding on the large surface, symmetry arrangement of the busbars around the groove and optimization design of the busbar section around the tank. Compared with the 320kA tank, the consumption of the single-slot busbar is reduced by 4.25 tons, and each electrolysis tank saves the infrastructure investment. 76,500 yuan. 3. Electrolytic cell structure design utilizes the current domestic and foreign electrolyzer design technical achievements, and innovative combination to form a set of electrolyzer structure design technology: 1 electrolyzer upper structure design adopts plate girder structure, double anode bus bar, double helix 8 hanging point Anode Bus Lifting Mechanism and 48 Single Anode Blocks, etc.; 2 Electrolytic Tank Shell Structure is optimized using a nonlinear finite element structural optimization model software. The tank shell structure is in the form of a boat type, a single sash, and a cradle ; 3 Aluminum electrolytic cell first 6 points AL2O3 point cutting and 2 points AlF3 point cutting. 4. For the first time, a 30% high-graphite cathode carbon block was designed. Its bottom voltage is 50-60mV lower than that of the common cathode, and it has been popularized and applied in 250kt/a large-scale aluminum electrolysis series. 5. The first graphite + coke roasting start-up method solves the problem of uneven current at the slot corner during the roasting of large-scale electrolytic cells, and ensures that the roasting start-up process of large-scale electrolytic cells is stable and the current distribution is uniform. 6. In the design of the 250kt/a extra large-scale aluminum electrolysis series, an ultra-large single electrolysis flue gas purification device with an 85kt/a electrolysis capacity was developed for the first time, and its purification rate reached F≤0.7kg/t-Al. 7. The 250kt/a extra-large aluminum electrolysis series design uses 350kA electrolyzers to save investment of 30.8 million yuan compared with 320kA electrolyzers. Eight aluminum electrolytic tanks were tested for a period of 3 months, with a current efficiency of 94.06% and a ton aluminum power consumption of 13111kwh.
The production and operation of this project shows that its main economic and technical indicators have reached the international leading level, and has significant economic and social benefits, and has broad prospects for promotion and application at home and abroad.
1. The simulation study of "physical field" of aluminum electrolyzer has reached the international advanced level, among which: 1 Electromagnetic cell "magnetic field" design uses strong compensation around the slot, weak compensation at the bottom of the slot, and local compensation of the bus at the end of the slot. Vertical magnetic field comparison The large value of │Bz│max is 13.575Gs, and the vertical magnetic field average │Bz|ave is 5.182Gs; 2 The electrolytic lining adopts a new type of carbonized silicon+carbon block, dry impervious material and high-graphite cathode. The material, the electrolytic cell "hot field" simulation results have the obvious characteristics of bottom insulation, side heat dissipation. 2. The busbar design around the electrolyzer adopts six-point uniform power feeding on the large surface, symmetry arrangement of the busbars around the groove and optimization design of the busbar section around the tank. Compared with the 320kA tank, the consumption of the single-slot busbar is reduced by 4.25 tons, and each electrolysis tank saves the infrastructure investment. 76,500 yuan. 3. Electrolytic cell structure design utilizes the current domestic and foreign electrolyzer design technical achievements, and innovative combination to form a set of electrolyzer structure design technology: 1 electrolyzer upper structure design adopts plate girder structure, double anode bus bar, double helix 8 hanging point Anode Bus Lifting Mechanism and 48 Single Anode Blocks, etc.; 2 Electrolytic Tank Shell Structure is optimized using a nonlinear finite element structural optimization model software. The tank shell structure is in the form of a boat type, a single sash, and a cradle ; 3 Aluminum electrolytic cell first 6 points AL2O3 point cutting and 2 points AlF3 point cutting. 4. For the first time, a 30% high-graphite cathode carbon block was designed. Its bottom voltage is 50-60mV lower than that of the common cathode, and it has been popularized and applied in 250kt/a large-scale aluminum electrolysis series. 5. The first graphite + coke roasting start-up method solves the problem of uneven current at the slot corner during the roasting of large-scale electrolytic cells, and ensures that the roasting start-up process of large-scale electrolytic cells is stable and the current distribution is uniform. 6. In the design of the 250kt/a extra large-scale aluminum electrolysis series, an ultra-large single electrolysis flue gas purification device with an 85kt/a electrolysis capacity was developed for the first time, and its purification rate reached F≤0.7kg/t-Al. 7. The 250kt/a extra-large aluminum electrolysis series design uses 350kA electrolyzers to save investment of 30.8 million yuan compared with 320kA electrolyzers. Eight aluminum electrolytic tanks were tested for a period of 3 months, with a current efficiency of 94.06% and a ton aluminum power consumption of 13111kwh.
The production and operation of this project shows that its main economic and technical indicators have reached the international leading level, and has significant economic and social benefits, and has broad prospects for promotion and application at home and abroad.
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