过程模拟期末作业.docx

Tune Move Suppression for each MV (Zhiyang Huang, L20363357)If the incremental fuel gas cost is zero, the LP Cost is showed in Table 9.1.Economics:TopBottomFuelMid RxLP CostCost-$5,000.00$3,000.00$0-$4,800RefluxFC2001$2,412.07$1,447.24$0.00$120.813.9801E+000SS ProductFC2002-$2,500.00-$1,235.65-$3,741.39$0.00-$1,370.84-8.8479E+000Feed TempTC2003-$3,951.09-$2,370.65$0.00$12.40-6.3093E+000Mid RxFC2004$2,315.38$1,389.23$0.00-$2,144.541.5601E+000Corrected SS Gains:FC2101FC2102FC2100QI2106BalanceRefluxFC2001-4.824145E-014.824145E-012.753683E-02-2.516919E-020.0000SS ProductFC20022.471305E-01-1.247130E+00-1.501417E-022.855908E-01-1.0000Feed TempTC20037.902176E-01-7.902176E-015.038574E-01-2.583789E-030.0000Mid RxFC2004-4.630762E-014.630762E-018.311425E-034.467786E-010.0000Raw SS Gains:FC2101FC2102FC2100QI2106BalanceRefluxFC2001-4.707777E-014.940513E-012.753683E-02-2.516919E-022.327360E-02SS ProductFC20022.102319E-01-1.284029E+00-1.501417E-022.855908E-01-1.073797E+00Feed TempTC20037.735323E-01-8.069029E-015.038574E-01-2.583789E-03-3.337060E-02Mid RxFC2004-4.399041E-014.862482E-018.311425E-034.467786E-014.634410E-02Table 9.1 Fractionator LP Cost Calculations(1) Find the Initial Suitable Move SuppressionImporting the new LP Cost value to the Simulate Controller, as showing in Fig 9.1.Fig 9.1 Change LP Cost (incremental fuel gas cost is zero)Table 9.2 shows suggested move size guidelines during the normal operation. Sometimes Current Move comes out with a negative value. Take absolute value and then compare with value limited table.FIC-2001Move 0.2 MBbl/dFIC-2002Move 0.15 MBbl/dTIC-2003Move 0.5 Deg FFIC-2004Move 0.5 MBbl/dTable 9.2 Suggested move size guidelinesStart with small move suppressions as 0.2. The results is showed below.Fig 9.2 Each Move Suppression=0.2Fig 9.2 illustrates that the value of Current Move of each MVs is too big. Then click initialize, double each MVs Move Suppression to 0.4. Click step, the results is showed in Fig 9.3.Fig 9.3 Each Move Suppression=0.4At this time, only the value of Current Move of FIC-2001 is too big. Then initialize the data, change the Move Suppression of FIC-2001 to 0.8, click step, the results is showed in Fig 9.4.Fig 9.4 Change Move Suppression of FIC-2001 to 0.8Fig 9.4 shows that each Current Move is acceptable. Then click run, some results was collected during the test, as showing from Fig 9.5 to Fig 9.10.Fig 9.5 DV=5, step 2Fig 9.6 DV=5, step 5Fig 9.7 DV=5, step 31Fig 9.8 DV=5, step 150Fig 9.9 DV=5, step 151Fig 9.10 DV=5, step 155(2) Change Feed FlowIn order to check whether the Move Suppression set is able to handle disturbances, we change the feed flow from 5 to 6 Mbbl/d and from 5 to 4 Mbbl/d, respectively. The following figures (From Fig 9.11 to Fig 9.26) show the results.Fig 9.11 Change Feed Flow from 5 to 6Fig 9.12 DV=6, step1Fig 9.13 DV=6, step2Fig 9.14 DV=6, step5Fig 9.15 DV=6, step40Fig 9.16 DV=6, step150Fig 9.17 DV=6, step152Fig 9.18 DV=6, step155Fig 9.19 Change Feed Flow from 5 to 4Fig 9.20 DV=4, step1Fig 9.21 DV=4, step2Fig 9.22 DV=4, step5Fig 9.23 DV=4, step50Fig 9.24 DV=4, step150Fig 9.25 DV=4, step152Fig 9.26 DV=4, step155The above figures show that the Move Suppression set can handle the disturbances changes.(3) Change set pointThe Move Suppression set that has passed both disturbances are used as the starting move suppressions for top composition set point change from 2 to 2.5 mol%. The results are showed below.Fig 9.27 Change Set Point from 2 to 2.5Fig 9.28 Change Set Point from 2 to 2.5, step1Fig 9.29 Change Set Point from 2 to 2.5, step3Fig 9.30 Change Set Point from 2 to 2.5, step5Fig 9.31 Change Set Point from 2 to 2.5, step50Fig 9.32 Change Set Point from 2 to 2.5, step150Fig 9.33 Change Set Point from 2 to 2.5, step152Fig 9.34 Change Set Point from 2 to 2.5, step155From the above figures, we find that the Move Suppression set can also handle the set point change.Accord