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8/11/2019 Energy Recovery & Utility Balances
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Author: Teoh Su-Fern, Elyse Kymberly (007950)
Title: General Aspects – Energy Recovery & Utility Balances
Supervisor: Dr. Lee Lai Yee
Group Number: Group 5 Page 1
Energy Recovery & Utility Balances
Section A: Energy RecoveryHeat integration is done in order to save operating costs on utilities such as cooling water, hot oil, superheated
steam, etc. After conducting pinch analysis, it is found that a threshold problem is present with a minimum heating
utility of 178.51 kW. The total energy recovered is 2922.25 kW. The pinch occurs at 40oC (cold pinch) and 50
oC (hot
pinch).
The heat cascade, hot and cold composite curves, grand composite curve and heat exchanger grid diagram are
shown in the figures below:
Figure A1: Heat Cascade
Figure A2: Hot and Cold Composite Curves
8/11/2019 Energy Recovery & Utility Balances
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Author: Teoh Su-Fern, Elyse Kymberly (007950)
Title: General Aspects – Energy Recovery & Utility Balances
Supervisor: Dr. Lee Lai Yee
Group Number: Group 5 Page 2
Figure A3: Grand Composite Curve
Figure A4: Heat Exchanger Grid Network
The updated process flow diagram with the heat exchanger network is attached as Figure A5.
0
50
100
150
200
250
300
350
400
450
0 500 1000 1500 2000
S h i f t e d T e m p e r a t u r e s ( o C )
Enthalpy (kW)
Grand Composite Curve
Min. Heating Utility = 178.51 kW
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Author: Teoh Su-Fern, Elyse Kymberly (007950)
Title: General Aspects – Energy Recovery & Utility Balances
Supervisor: Dr. Lee Lai Yee
Group Number: Group 5 Page 3
Section B: Utility Balances
1. Heat Exchangers
2. Reactor Energy Balance
Heating Duty Required = 2887.28 kW
Heat Transfer Fluid Requirement = 315.94 kg/s= 1137384.0 kg/h
Note: Detailed calculations will be shown in the appendix (section reactor design)
Heat
Exchanger
Energy
(kW)
Utility
Shell Side Tube Side
Type Flowrate
(kg/h)
Supply
Temperature
(oC)
Target
Temperature
(oC)
Type Flowrate
(kg/h)
Supply
Temperature
(oC)
Target
Temperature
(oC)
HE-01 489.43 ProcessFluid 16105.8 409.0 359.6 ProcessFluid 16105.8 66.0 108.0
HE-02 4129.63 Process
Fluid
16105.8 108.0 128.0 Heat
Transfer
Fluid
1090131.9 386 380.3
HE-03 554.06 Process
Fluid
8052.9 359.6 247.7 Process
Fluid
16105.8 128.0 191.3
HE-04 554.06 Process
Fluid
8052.9 359.6 247.7 Process
Fluid
16105.8 191.3 254.6
HE-05 178.51 Heat
Transfer
Fluid
47252.1 386.0 380.3 Process
Fluid
16105.8 254.6 275.0
HE-06 1324.70 ProcessFluid 16105.8 247.7 114.0 ProcessFluid 29032.7 40.0 90.0
HE-07 3815.30 Process
Fluid
16105.8 114.0 40.0 Chilled
Water
327028.4 10.0 20.0
HE-08 2700.00 Process
Fluid
22803.1 125.0 130.0 High
Pressure
Steam
120000.0 300.0 259.0
HE-09 238.00 Process
Fluid
6262.0 46.0 37.0 Cooling
Water
51300.0 30 34
HE-10 13139.00 Process
Fluid
68760.0 130.0 145.0 Medium
Pressure
Steam
817200.0 190.0 170.0
HE-11 13111.00 Process
Fluid
55440.0 110.0 90.0 Cooling
Water
1129176.0 30.0 50.0
HE-12 18600.00 Process
Fluid
1472.1 128.7 128.7 Low
Pressure
Steam
56800.8 147.7 128.7
HE-13 5004.10 Process
Fluid
6852.3 112.9 96.0 Chilled
Water
158749.2 7.0 34.6
8/11/2019 Energy Recovery & Utility Balances
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Author: Teoh Su-Fern, Elyse Kymberly (007950)
Title: General Aspects – Energy Recovery & Utility Balances
Supervisor: Dr. Lee Lai Yee
Group Number: Group 5 Page 4
3. Pumps & Compressors
4. Acetaldehyde Storage Tank
Cooling duty required = 56.9 kW
Chilled water required = 9754.3 kg/h
Pump Power (W)
P-001 537.10
P-002 2470.66
P-003 606.59
P-004 991.52
P-005 1241.38
P-006 421.52
P-007 265.95
P-008 769.59
P-009 183.63
P-010 3746.95
P-011 479.86
P-012 652.82
P-013 2523.82
P-014 2920.96
P-015 63.88
Compressor Power (kW)
COMP-01 1426.21
