Automated Continuous Process Control Part 4 pdf

... A T H set T R T H Cooling water Figure 4- 1.2 Cascade control of reactor. c 04. qxd 7/3/2003 8:22 PM Page 63 CHAPTER 4 CASCADE CONTROL Feedback control is the simplest strategy of automatic process control that com- pensates for process ... processes, in cascade control, and when a final control element is driven by more than one controller, as in override control schemes....

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... Page i 3 FEEDBACK CONTROLLERS 38 3-1 Action of Controllers / 38 3-2 Types of Feedback Controllers / 40 3-2.1 Proportional Controller / 40 3-2.2 Proportional–Integral Controller / 44 3-2.3 Proportional–Integral–Derivative ... Tuning / 54 3-5 Summary / 60 References / 60 Problems / 60 4 CASCADE CONTROL 61 4- 1 Process Example / 61 4- 2 Implementation and Tuning of Controllers / 6...

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... 26 SELF-REGULATING PROCESSES 25 0 10 20 30 40 50 45 50 55 60 0 10 20 30 40 50 45 50 55 60 45 50 55 60 0 10 20 30 40 50 45 50 55 60 Time, sec 0 10 20 30 40 50 45 50 55 60 Time, sec Tt i () Tt i () Tt 1 () Tt 1 () Tt 2 () Tt 2 () Tt 3 () Tt 3 () Tt 6 () Tt 7 () Tt 7 () Figure ... used should be consistent with the time unit used by the controller or control K p == - () - () =- D...

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... some processes, Ms Es K C () () = mt m et () =+ () 100 PB PB = 100 K C TYPES OF FEEDBACK CONTROLLERS 43 c03.qxd 7/3/2003 8:23 PM Page 43 46 FEEDBACK CONTROLLERS To explain why the PI controller ... 7/3/2003 8:21 PM Page 34 TYPES OF FEEDBACK CONTROLLERS 49 Figure 3-2.6 Response of heat exchanger temperature to a disturbance. c03.qxd 7/3/2003 8:23 PM Page 49 44 FEEDBACK CONTROLLERS s...

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... temperature transmitter, 74 c05.qxd 7/3/2003 8:28 PM Page 74 Automated Continuous Process Control. Carlos A. Smith Copyright ¶ 2002 John Wiley & Sons, Inc. ISBN: 0 -47 1-21578-3 4- 4 CLOSING COMMENTS So ... 8:28 PM Page 75 RATIO CONTROL 85 FC 23 FC 24 PC 22 FT 24 FT 23 PT 22 Stack Steam Fuel Air FC FO F F set F F P F A SP FY 24 x F F A F F A set (a) F F F A FC 23 FC 2...

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... HS16. The valve position controller, VPC16, controls the valve posi- 94 RATIO, OVERRIDE, AND SELECTIVE CONTROL TC 14 TT 12 FC 11 FT 11 vp Fuel Air TC 12 TC 13 TC 15 TT 13 TT 14 TT 15 DPT 16 DPC 16 Recycle Hot ... CONTROL TT 12 FC 11 TC 12 FT 11 Process stream vp Fuel Air PT 14 PC 14 LS 11 TT 13 TC 13 RFB RFB T stack T P F F F F set F F set F F set FO FC Figure 5-3 .4 Heater t...

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... 123 O2T PT PT PT T -46 F -43 F -44 F -45 To flare Natural gas Chemicals Water Wells Figure P5-15 Process for Problem 5-16. c05.qxd 7/3/2003 8:28 PM Page 123 (a) Design a control scheme to control the chlorine ... a control system to control the level in the tank and at the same time maintain the correct formulation. 1 14 RATIO, OVERRIDE, AND SELECTIVE CONTROL LC 13 LT 13 Pump...

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... 6 3900 0 .47 2 3 240 0 0.167 7 500 0.900 4 340 0 0. 049 c07.qxd 7/3/2003 8:26 PM Page 145 BLOCK DIAGRAM DESIGN OF LINEAR FEEDFORWARD CONTROLLERS 147 G T 1 = transfer function of the mixing process; ... disturbances before they affect the controlled variable. Specifically, feedforward calls for measuring the 142 c07.qxd 7/3/2003 8:26 PM Page 142 Automated Continuous Process Cont...

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... () + () () -= () +1 1 53 46 44 55 8 91 FB FB .% mt mt mt () = () () + () () -= () 1 1 44 55 44 55 FB FB 158 FEEDFORWARD CONTROL c07.qxd 7/3/2003 8:26 PM Page 158 150 FEEDFORWARD CONTROL Dividing ... 150 160 FEEDFORWARD CONTROL Finally, substituting Eqs. (7-2.6), (7 -4. 5), and (7 -4. 6) into Eq. (7 -4. 4) yields (7 -4. 7) Because the dead time is again negative, (7 -4. 8) Figur...

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... MULTIVARIABLE PROCESS CONTROL c09.qxd 7/3/2003 7:55 PM Page 188 CHAPTER 9 MULTIVARIABLE PROCESS CONTROL Up to this point in our study of automatic process control only processes with a single controlled ... K C D = = = 173 056 013 1 .% . min . min CO %TO t t 47 48 49 50 51 0.0 1.0 2.0 3.0 4. 0 5.0 Time, minutes Transmitter Output, %TO 48 50 52 54 56 58 60 0.0 1.0 2.0 3.0...

Ngày tải lên: 06/08/2014, 02:20