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Course Lecture Notes - 28150 Introduction to proces control...

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1 28150. Introduction to proces control 1. Introduction Krist V. Gernaey 31 August 2009 28150 Learning objectives • At the end of this lesson you should be able to: – Identify the basic elements of a given control system – Classify SISO control strategies 31 August 2009 28150 Outline • Introductory examples + basic control terminology • A detailed example: blending tank • Process control hierarchy and control system design • Group work 31 August 2009 28150 Outline Introductory examples + basic control terminology • A detailed example: blending tank • Process control hierarchy and control system design • Group work
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2 31 August 2009 28150 A couple of questions • Who knows something about process control? • Who knows how to drive a car? 31 August 2009 28150 A process control example 31 August 2009 28150 Basic control terminology controlled variable (output variable, Y): the variable which quantifies the performance or quality of the final product set point (Y SP ): the desired value of the controlled variable manipulated variable (input variable, U): the variable that is adjusted dynamically to keep the controlled variable at the set point measured variable disturbance variable (D): input variable that can cause the controlled variable to deviate from the set point 31 August 2009 28150 Basic control terminology – block diagram
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3 31 August 2009 28150 Basic control terminology – block diagram 31 August 2009 28150 Bioreactor example: pH control 31 August 2009 28150 Bioreactor example: pH control, block diagram 31 August 2009 28150 Single input – Single output (SISO) control loop structures Can you come up with suggestions for an alternative structure? Y SP + - FEEDBACK CONTROLLER PROCESS D Y U FEEDFORWARD CONTROLLER PROCESS D Y U Y SP
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4 31 August 2009 28150 What is a process? • The conversion of feed materials to products using chemical and physical operations • The term ”process” can be used to denote: – The processing operation – The processing equipment • ”The foundation of process control is process understanding” 31 August 2009 28150 Why process control • Increasing performance requirements for process plants: – Competition – Environmental regulations – Safety regulations • Modern process plants are more difficult to operate: – More complex processes – Trend towards integrated plants (disturbance propagates!) • New regulations, e.g. in the pharmaceutical industry (Process Analytical Technology (PAT) guidance) 31 August 2009 28150 DSM, Geleen, The Netherlands 31 August 2009 28150 Why process control?
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