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The Research On The Optimization Of Aluminum Reduction Cell Physical Fields’ Simulation Under Low Voltage

Posted on:2015-10-29Degree:MasterType:Thesis
Country:ChinaCandidate:S Y ZhangFull Text:PDF
GTID:2181330434450879Subject:Power Engineering and Engineering Thermophysics
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Abstract:Aluminum reduction cell is the traditional energy consumption users, energy conservation is the persistent pursuit of aluminum industry workers, low-voltage aluminum electrolysis is the only way for the future development of the aluminum industry, lower polar distance is a direct and effective method to lower cell voltage. While lower cell voltage will cause a series of effects to aluminum reduction cells normal operating, especially its’ physical fields, the current design of aluminum reduction cells’ physical fields is not suitable for its running under low-voltage, people don’t much research on aluminum reduction cells’ physical fields under low-voltage. This paper set175kA aluminum reduction cells of an aluminum company as the research object, do some numerical simulation of its physical fields under low-voltage, studied the relationship between lower cell voltage and intensify current in detail, calculated the energy balance of the experimental cells, and get the heat loss of each direction under different voltage. The main contents in this paper are as follows:(1) Consulting large numbers of related literature, according to175kA prebaked aluminum reduction cell dimensions and paraments the aluminum company provided, appropriately simplified the model, established this series of aluminum reduction cells’ electric-magnetic-flow field and thermal field mathematical and physical models.(2) Simulated the series of175kA aluminum reduction cells’ electric-magnetic-flow field, and carried out some industrial test, verified the correctness of the model. The results show that:magnetic field strength in the X direction is obvious hierarchical, anti-symmetric about the minor axis center line distribution, extreme value is distributed in the inlet and outlet near the pot shell of the cells, and the value in the inlet is bigger than in the outlet; magnetic field strength in the Y direction substantially symmetric with the respect to the long axis of the center of the distribution, and the extreme values are in the two corners of the inlet; magnetic field strength in the Z direction substantially symmetric with the respect to the long axis of the center of the distribution, and the extreme values are in the two corners of the outlet; The flow rate of liquid aluminum is the distribution of basic two large eddies; the maximum flow rate, appeared at the edge of the large vortex; the interface depressed in the region of the two large eddies.(3) Studied the relationship between lower cell voltage and intensify current in detail, calculated the magnetic field, flow flied and interface deformation under different cell voltage and current. The result show that: As the current increases, the magnetic strength and aluminum liquid flow rate increase steadily; when the current is less than185kA, the electrolyte-liquid interface deformation grows slowly, when the current is more than185kA,it grows fast; Under the same current but different polar distances, the magnetic field distribution of the cell, the flow rate of aluminum liquid and aluminum liquid-electrolyte interface deformation didn’t change a lot, indicating lower polar distance won’t make the physical fields a big change. For the test cells, considering various factors, should choose the polar distance between3.5cm-4cm,the current between180-185kA to run. After the joint venture industrial tests carried out, it perform well。(4) Calculated the aluminum reduction cells’thermal field, compared to the test results,verified the correctness of the model. Research the aluminum reduction cells’thermal field under different conditions, through the calculation of the experimental cell’s energy balance, get the heat loss of each direction. Studied the heat dissipation of aluminum reduction cell in each direction changes with the cell voltage reduce, get an new insulation scheme under low cell voltage. Pictures42, Tables18, References80...
Keywords/Search Tags:aluminum electrolytic under low voltage, multi-physicalfields, simulation, energy balance
PDF Full Text Request
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