Process Control Systems Episode 9 pps

... WCCC/WHCH) (9. 11) (9. 12) To envision what effect flow rates have upon exit temperature, Eg. (9. 11) is plot’ted in Fig. 9. 4 with the same abscissa and parameter that were used in Fig. 9. 3. FIG 9. 4. ... with Eq. (9. 11) yields: THI - THZ 1 THI - TCI = CH/AkH -k 96 •k ( WHCH/WCCC)(CC/A~C -k 35) (9. 13) A plot of Eq. (9. 13) for conditions of CH/AkH = Cc/Akc = 1 is given...

Ngày tải lên: 12/08/2014, 16:21

... capacit’y process is 400/al6 or 8 times as difficult to control. Recall that the pure dead-time process was 12.5 times as difficult to control as the most difficult two-capacity process. The ... 1.25. Zntegral control of dead time (aboue) is the same as propor- tional control of a dead-time plus integrating process (below). Dynamic Elements in the Control Loop I P7 Proporti...

Ngày tải lên: 12/08/2014, 16:21

... optimiz- ing control system, the difference between the input, and output of the Multivariable Process Control I 199 structure as the process, but would solve for manipulated variables. Since each process ... November, 195 9. 7. Mamzic, C. L.: Peak-seeking Optimizers, instruments and Control Systems, October, 196 2. PROBLEMS 6.1 The reactor in Example 3.4 is to be equipped wi...

Ngày tải lên: 12/08/2014, 16:21

... by Process I 1 ml-7-7gg+ Controller , FIG 4.10. The complementary controller has a model of the process in its positive feedback loop. L l Linear Controllers 99 I loop. For t,his reason, all controllers ... 0.76 6.00 0 .95 8.00 1.27 -__ 3. 197 d 0.517&1 4.00 0.64 5.37 0.86 2.867d 0.45rJn 4.00 0.64 6. 79 1.08 Perform- ance, PR/100 m 4 .52sd2/rl 3.65 4.58 0 .97 72/71 0.81 0 .9...

Ngày tải lên: 12/08/2014, 16:21

... than one control loop. CASCADE CONTROL The output of one controller may be used to manipulate the set point of another. The two controllers are then said to be cascaded, one upon the other. Each controller ... constant gain for the primary loop. RATIO CONTROL SYSTEMS In a ratio control system, the true controlled variable is the ratio K of two measured variables X and Y: K=; (6.3)...

Ngày tải lên: 12/08/2014, 16:21

... Feedforward Analog Computer Control of a Superfractionator, Control Eng., March, 196 4. 4. Shinskey, F. G.: Analog Computing Control for On-line Applications, Conlrol Eng., November, 196 2. PROBLEMS 8.1 ... New York, 195 1. PROBLEMS 7.1 Classify the five controlled variables appearing at the beginning of the section “Decoupling Control Systems. ” If the composition of only one produ...

Ngày tải lên: 12/08/2014, 16:21

... three-mode controllers from being optimally tuned, particu- larly the noninteracting controller. So the amount of improvement possible may only be realized with t,he forward loop. Chapter 9 9.1 Flow ... must be 96 4 lb/min; at 240°F inlet, it is reduced to.150 lb/min. 9. 3 Process gain is O.O41”F/(lb/ min) at 100 lb/min feed, and 0.28a°F/ (lb/min) at 80 Ib/min, a ratio of almost...

Ngày tải lên: 12/08/2014, 16:21

... dual-mode control, 141 in sampling systems, 114, 115 Time-shared control, 110 (See also Direct digital control) Transfer, auto-manual, 98 , 99 in digital control systems, 1 19 energy, control of ... pairing, 188- 198 controlled variables, choosing, 182-188 decoupling control systems, 198 - 202 Process gain, 51-53 Process model, for decoupling systems, 198 -202 of dist...

Ngày tải lên: 12/08/2014, 16:21

... C 98 (210) 298 (570) 98 (210) 398 (570) 398 (570) 32 (90 ) 98 (210) Inconel U 298 (570) 32 (90 ) 26 (80) 32 (90 ) 32 (90 ) 98 (210) Monel 98 (210) 298 (570) U U U U 98 (210) Nickel 98 (210) 32 (90 ) ... 98 (210) 98 (210) Monel 204 (400) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) Nickel U 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) 304 SS 49 (120) 1 4...

Ngày tải lên: 12/08/2014, 16:20