Chemical Engineering. Essentials of Process Control by Dupont

By Dupont

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I i 140 P Level Control (Kc=1 S) l l-i-L ... . 8 ... 160 . I2 .. _,. ;. ;. :_ . :. i 180 200 .............. : ...... :i 10 i 0 20 40 60 80 100 120 Time (min) I I I 140 160 180 200 I I I I I I I I . ;. ;. :. . ;. ;. ;. ;. . ;. _ ; ; ; ; ; 1 f . ii I::::::::! I... j . . . . f . . . . i . . . : . . . . : . . . . :. . . . : . . . 7 Level control of two tanks in series using P controllers. abwrrx I: Introduction 1 I at time equal zero. 3 gives the “m-file” used.

5 I I . . . . . . . . . . . . . . . . . ~.................. 01 hr in the measurement of the temperature 7’, . The temperature controller sees a PV signal that is delayed by D hours. The effect this has on control is illustrated in Fig. 13. 01 hr because of the deadtime. Comparing Figs. 13 shows clearly that the dynamic performance with deadtime is worse. Higher gains now give oscillatory behavior. The FORTRAN program used for the deadtime simulation is given in Appendix A.

01 hr in the measurement of the temperature 7’, . The temperature controller sees a PV signal that is delayed by D hours. The effect this has on control is illustrated in Fig. 13. 01 hr because of the deadtime. Comparing Figs. 13 shows clearly that the dynamic performance with deadtime is worse. Higher gains now give oscillatory behavior. The FORTRAN program used for the deadtime simulation is given in Appendix A. These simulation results illustrate some profoundly important principles: 1.

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