The Structure Design Of Cathode And Simulation On Multiple Physical Fields Of Drained Reduction Cell

The drained aluminum reduction cell,first present in the1980s, because the aluminum liquid does not exist under the anode bottom, it can keep running under the lower anode cathode distance, has great market potential for its energy saving. To research of the different physical fields of the drained aluminum reduction cell, can well evaluate its energy saving potential and the possible problems in the operation. This has gudiance meaning to realize the industrialization of the drained aluminum reduction cell.Based on the project "The structure design and simulation of114.5kA drained cell",aimed at114.5kA aluminium electrolytic cell of an aluminum company, the numercial simuliationg and optimization of the thermo-electric field, the electromagnetic field and the flow field of aluminium electrolytic cell and the drained aluminum reduction cell has been studied in this dissertation.The main conclusions and innovations of the paper are as follow:1) Taking the commercial software ANSYS as platform, Established a set of the electric field, magnetic field, thermal field, flow field coupling simulation model based on a114.5kA electricity aluminum reduction cells. Realized the thermo-electric field coupling and the flow field of the electromagnetic coupling in the same cell.2) Established routine1/4cell3d analytical model of electric heating in the114.5kA electricity aluminum reduction cells and the drained aluminum reduction cell, and has carried on the deep analysis to the result, Draw a system voltage of the drained aluminum reduction cell is3.312V, the frozen ledge thickness is9.8cm. In this paper, based on the measured results, the electric field and temperature field error less than10%;3) For the114.5kA electricity aluminum reduction cells put forward a more reasonable modification scheme of the drained aluminum reduction cell:with the method of trenching for middle and both, useing a sloping way that drive up50cm of cathode carbon in the middle of it, add a carbon ceramic fiber board of20cm thickness, increase of alumina layer thickness of20cm, use of TiB2composite coating material and so on.4) Carried on a thorough analysis to the simulation results of the electromagnetic field and the flow field that the main driving force is electromagnetic force. the size of electromagnetic field and electromagnetic force and the overall distribution of the electromagnetic force is obtained; To analyisis the flow field that the main driving force is electromagnetic force of the conventional cells and drained aluminum reduction cell, by the drained aluminum reduction cell the mean velocity of liquid aluminum has decreased by50%, the maximum of it has a30%reduction, And assessed the operation risk that the drained aluminum reduction cell run in low anode cathode distance, to obtain a result that the aluminum liquid fluctuation is only1.08cm when the curb is full of aluminum liquid, in the general case is only0.58cm. When aluminum levels low than14cm, aluminum liquid won’t overflow the grooves,it can ensure the Stable operation when the drained aluminum reduction cell has ran in low anode cathode distance.