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Analysis Of Structural-Thermo-ElectricCharacteristics In420kA New Cathode Aluminum Reduction Cell

Posted on:2014-05-17Degree:MasterType:Thesis
Country:ChinaCandidate:J J ZhouFull Text:PDF
GTID:2181330431999635Subject:Non-ferrous metallurgy
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Abstract:Aluminum industry faces enormous pressure on energy saving, and the urgent need forenergy conservation technologyof domestic aluminum production lines in order to reduce the energy consumption of aluminum production. In this paper, electric-thermal field and stress field of a420kA grade aluminum cell aluminum cell with new cathodeswerecalculated and been studied forrisk diagnostic. Main results are as follows:(1) Based on theoretica ofl physics, electrical and stress problems, thermal field and stress field models forreduction cellwere established, and a set of calculation methodwith the implement in the ANSYS platform were proposed. The thermal field and stress field numerical calculation can be use to diagnostic analysis.(2) Using the established electric-thermal coupling model, a420kA cell with new cathodes wasanalyzed. The results show that voltage distribution is reasonableafter the using new structur.Total cell voltage is about3.962V, which meet with the design values and has good potential for energy savings. The thermal insulation performance is good, about12℃superheat can be achieved.The main part of cathodes are in the region ofelectrolyte liquidus temperature line.The operating remperature ofinsulating bricks is reasonable, as well asthe proportion of the various parts of cooling. The ledgeis a little thin but still has a well-shapededge. Thestress field studies of this new cathode cell have shown that the stress distribution in cathode structure is normal except for there is a big part of the stress in the insulating paste (SiC) bonded carbon block.Themaximum value of first principal stress and equivalent stress in majority region of cathoeds isbelow22MPa and33MPa respectively.(3) Acomparative studyof the electric-thermal field between420kA new cathode aluminum cell and conventional420kA aluminum reduction cellas well as the risk diagnosis were carried out. The results show that little difference existing between new cathode cell and conventional cell, but the use of new cathode can optimize current distribution in the petal pad, reduce the level of the horizontalcurrent. Risk diagnostic show that this new type of cathode cell more likely has the risk of overheatingin collector bars under thecircumstances ofloose contact with carbon paste than ordinary cell.
Keywords/Search Tags:aluminum reduction, thermal field, stressfield, numericalsimulation
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