Answer 2 questions for 100 marks Question 1: Process Design [25 marks] An incomplete process design of a flash drum distillation unit is presented in Figure 1. The key variables to be controlled are flow rate, temperature, composition, pressure and liquid level in the drum. Disturbances are observed in the feed temperature and composition. Heat exchangers Drum Vapor Liquid Pump Figure 1: Incomplete process design of a distillation unit Answer the following questions briefly and in a qualitative fashion: a) Determine which sensors and final elements are required so that the important variables can be controlled. Sketch them in the figure using correct instrumentation tags. Describe briefly what instruments you will use and where they should be located. Reflect on the potential presence of a flow controller upstream of your process design (not shown in the diagram). How would this affect the level controller in the drum? b) [10 marks] Describe briefly how you qualitatively determine the required capacities / sizes of the heat exchangers. [5 marks] c) Select controller pairings; in other words, select which measured variable should be controlled by adjusting which manipulated variable. State explicitly what action is taken by each final element upon a deviation of the measured variable? Critique your design in max four sentences: are there any competing control actions, potentially causing further deviations? [10 marks]
Answer 2 questions for 100 marks Question 1: Process Design [25 marks] An incomplete process design of a flash drum distillation unit is presented in Figure 1. The key variables to be controlled are flow rate, temperature, composition, pressure and liquid level in the drum. Disturbances are observed in the feed temperature and composition. Heat exchangers Drum Vapor Liquid Pump Figure 1: Incomplete process design of a distillation unit Answer the following questions briefly and in a qualitative fashion: a) Determine which sensors and final elements are required so that the important variables can be controlled. Sketch them in the figure using correct instrumentation tags. Describe briefly what instruments you will use and where they should be located. Reflect on the potential presence of a flow controller upstream of your process design (not shown in the diagram). How would this affect the level controller in the drum? b) [10 marks] Describe briefly how you qualitatively determine the required capacities / sizes of the heat exchangers. [5 marks] c) Select controller pairings; in other words, select which measured variable should be controlled by adjusting which manipulated variable. State explicitly what action is taken by each final element upon a deviation of the measured variable? Critique your design in max four sentences: are there any competing control actions, potentially causing further deviations? [10 marks]
Chapter59: Motor Startup And Troubleshooting Basics
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Problem 12SQ: How is a solid-state diode tested? Explain.
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![Answer 2 questions for 100 marks
Question 1: Process Design
[25 marks]
An incomplete process design of a flash drum distillation unit is presented in Figure 1. The
key variables to be controlled are flow rate, temperature, composition, pressure and liquid
level in the drum. Disturbances are observed in the feed temperature and composition.
Heat exchangers
Drum
Vapor
Liquid
Pump
Figure 1: Incomplete process design of a distillation unit
Answer the following questions briefly and in a qualitative fashion:
a) Determine which sensors and final elements are required so that the important
variables can be controlled. Sketch them in the figure using correct instrumentation
tags. Describe briefly what instruments you will use and where they should be
located. Reflect on the potential presence of a flow controller upstream of your
process design (not shown in the diagram). How would this affect the level controller in
the drum?
b)
[10 marks]
Describe briefly how you qualitatively determine the required capacities / sizes of
the heat exchangers.
[5 marks]
c) Select controller pairings; in other words, select which measured variable should be
controlled by adjusting which manipulated variable. State explicitly what action is taken
by each final element upon a deviation of the measured variable? Critique your design
in max four sentences: are there any competing control actions, potentially causing
further deviations?
[10 marks]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2db44585-c4a2-4af2-ac7a-630d880435aa%2Ff723f3d0-e202-4117-b26e-f3aa2363a09d%2Fu1hk2xa_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Answer 2 questions for 100 marks
Question 1: Process Design
[25 marks]
An incomplete process design of a flash drum distillation unit is presented in Figure 1. The
key variables to be controlled are flow rate, temperature, composition, pressure and liquid
level in the drum. Disturbances are observed in the feed temperature and composition.
Heat exchangers
Drum
Vapor
Liquid
Pump
Figure 1: Incomplete process design of a distillation unit
Answer the following questions briefly and in a qualitative fashion:
a) Determine which sensors and final elements are required so that the important
variables can be controlled. Sketch them in the figure using correct instrumentation
tags. Describe briefly what instruments you will use and where they should be
located. Reflect on the potential presence of a flow controller upstream of your
process design (not shown in the diagram). How would this affect the level controller in
the drum?
b)
[10 marks]
Describe briefly how you qualitatively determine the required capacities / sizes of
the heat exchangers.
[5 marks]
c) Select controller pairings; in other words, select which measured variable should be
controlled by adjusting which manipulated variable. State explicitly what action is taken
by each final element upon a deviation of the measured variable? Critique your design
in max four sentences: are there any competing control actions, potentially causing
further deviations?
[10 marks]
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