Exam_152A

Exam_152A - Department of Chemical Engineering University...

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Department of Chemical Engineering University of California, Santa Barbara Ch.E. 152A Fall, 2003 FINAL EXAM Problem 1 (15 points) A steam-heated evaporator is used to concentrate a hazardous feed stream by evaporating water, as shown below. The mass fraction of solute in the exit stream x is measured and controlled by adjusting the steam flow rate, S . Draw a block diagram for the controlled process, using appropriate symbols in the schematic diagram. Problem 2 (15 points) Consider the evaporator control system of Problem 1. Assume that the analyzer-transmitter (AT) is direct-acting and that the control valve is air-to-open. a. ( 5 points ) Should the PI controller (AC) be reverse-acting or direct-acting? Briefly justify your answer. b. ( 10 points ) Discuss the process safety issues and propose an alarm/SIS strategy.
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Problem 3 (15 points) A process has the following transfer function: 3 2 () 5 ( 1 ) (0 . 5 1 ) s Ys se Us ss s = + + For a unit step change in u , briefly justify your answers to the following questions about the
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This note was uploaded on 07/12/2009 for the course CHE 162A taught by Professor Seborg during the Fall '08 term at UCSB.

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Exam_152A - Department of Chemical Engineering University...

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