P8_9-Box Implementation Bayside

1、Implementation at Bayside AluminiumThe Cryotherm Sensor and 9-Box Control Algorithm as a Process Control Tool at Bayside Aluminium Reduction ASULEMAN ASMALCONTENTSTrial 1 Sept 2002Trial 2 Jun 2003Trial 3 Feb 2004Full implementation Aug 2004HighlightsChallenges Trial 1 Trial 1 Trial 1 24 Pots : Summa

2、ryParameterPotline Cryotherm SectionCommentsAve Volts V4.464.52 Voltage increaseTemp Std Dev11.17.64 Improved temp Std deviationAlF3 Std Dev2.141.60 Improved AlF3 Std deviationCurrent Efficiency92.8%93.2 Increase in CE by 0.5 % Trial 1 24 Pots : TempTrial 1 24 Pots : Voltage.Trial 1 24 Pots : AlF3Tr

3、ial 1 24 Pots : CETrial 1 24 Pots : FeedTrial 2Trial 2 Trial 2 4 Pots : SummaryParameterPotlineCryotherm SectionCommentsAve Volts 4.454.39 Voltage reductionTemp Std Dev10.37.51 Improved temp Std deviationAlF3 Std Dev2.121.57 Improved AlF3 Std deviationAlumina Consumption kg/pot/day16751746 Increase

4、in alumina feedTrial 2 4 Pots : FeedTrial 2 4 Pots : VoltageTrial 2 4 Pots : AlF3Trial 2 4 Pots : TempTrial 3Trial 3Trial 3 : 24 PotsParameterPotlineCryotherm SectionCommentsAve Volts V4.434.41 Voltage reductionTemp Std Dev15.67.7 Improved temp Std deviationAlF3 Std Dev2.151.82 Improved AlF3 Std dev

5、iationAlumina Consumption kg/pot/day16621726 Increase in alumina feedTrial 3 : 24 Pots : FeedTrial 3 : 24 Pots : VoltageTrial 3 : 24 Pots :AlF3Trial 3 : 24 Pots :TempTrial 3 : 24 Pots :Temp Std DevCryotherm ProjectFull ImplementationProject TimelineHighlightsFull rollout in 21 daysRecord number of p

6、ots in operation 239 pots in Sep 04Current increased to146.20 kAReduction in pot voltageTransfer of technical knowledge to operatorsChallengesExceptional Pot Treatment New pots Voltage controlFlash disk problems location9-Box Program errors split 9-Box into 3 unitsContact block burn outs CVDFiltering suspect info so that 9-Box does not act on incorrect inputs.Next StepsExceptions reportExceptions diagnostics hintImprove interface between cr