Workshop for Flipped Class
Based on students having completed the Chapter 2 e-Lesson before class
Chapter 2
Control Objectives and Benefits
Copyright © Thomas Marlin 2016
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 1. Fired Heater Control Objectives
1. Safety
2. Environmental
Protection
A drawing of a fired heater is given below,
with a larger version on the next page.
Identify at least one example for each of
the seven categories of control objectives.
3. Equipment
protection
4. Smooth operation
production rate
PIC
1
AT
1
FT
1
PI
4
TI
1
PI
5
TI
5
5. Product quality
TI
2
TI
6
PT
1
6. High profit
TI
3
TI
7
TI
4
7. Monitoring &
diagnosis
TI
8
FT
2
PI
2
PI
3
TI
9
TI
10
FI
3
TI
11
PI
6
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 2. Distillation Control Objectives
1. Safety
2. Environmental
Protection
An enlarged drawing of a distillation
tower is given on a next slide. Identify at
least one example for each of the seven
categories of control objectives.
3. Equipment
protection
PC-1
L4
P3
T5
4. Smooth operation
production rate
LC-1
17
F7
16
LC-2
dP-1
15
5. Product quality
T6
AC-1
T10
3
TC-7
6. High profit
7. Monitoring &
diagnosis
F3
dP-2
2
F4
1
LC-3
F9
F8
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 2. Distillation Control Objectives
PC-1
L4
P3
T5
LC-1
17
F7
16
LC-2
dP-1
15
T6
AC-1
T10
3
TC-7
F3
dP-2
2
F4
1
LC-3
F9
F8
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 4. Residuum viscosity control
Crude oil residuum viscosity control: The product viscosity is
controlled by adjusting the flow of expensive light gas oil that reduces
the product viscosity. The initial distribution is given. Determine
what the distribution with improved control should be.
Residuum
AC
Frequency (%)
Before: mean = 376, stnd dev = 13
LC
40
30
20
10
Viscosity (cst)
Light Gas Oil
(expensive)
Ciatation3
40
5
38
5
36
5
34
5
32
5
0
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 6. Identify and evaluate key assumption
A few assumptions were tacitly made when the frequency distribution
and the performance correlation were used in calculating the average
performance. Identify the assumptions and determine when they are
valid.
Calculations for the average performance
(Pave) for the data set
CHAPTER 2. CONTROL OBJECTIVES AND BENEFITS
Workshop 8. Calculate profitability for a control improvement
Measure and control O2 to
operate
• Safety improved; less chance
of fuel-rich environment
• Higher efficiency by reducing
excess oxygen
Is the investment justified by
the fuel savings? Continued on
next slide.