Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN)...
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Transcript of Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN)...
![Page 1: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/1.jpg)
Pinch technology series 1
By:
Anwaruddin Hisyam
An Introduction to An Introduction to
Heat Exchanger Network (HEN) Heat Exchanger Network (HEN) DesignDesign
![Page 2: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/2.jpg)
Pinch technology series 2
In this lecture we will learn how to set energy recovery targets for a process.
![Page 3: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/3.jpg)
Pinch technology series 3
Pinch identificationPinch identification
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Pinch technology series 4
Base case
Reactor
50 C
160 C270 C210 C
210 C
220 C
180 C60 C
130 C
149 C
1620
2640
19801220
178 C
160 C
880
![Page 5: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/5.jpg)
Pinch technology series 5
Data Extraction
Reactor
50 C
160 C270 C210 C
210 C
220 C
180 C60 C
130 C
149 C
1620
2640
19801220
178 C
160 C
880
![Page 6: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/6.jpg)
Pinch technology series 6
…..from data extraction
Reactor
50 C
160 C270 C210 C
210 C
220 C 60 C
130 C
160 C
![Page 7: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/7.jpg)
Pinch technology series 7
Stream Data (Problem Table)
NoT source,
CT target,
CHeat duty,
kWCP Type
1 220 60 3520 22 Hot
2 270 160 1980 18 Hot
3 50 210 3200 20 Cold
4 160 210 2500 50 Cold
CP = Heat duty/ABS(T source – T target)
![Page 8: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/8.jpg)
Pinch technology series 8
Composite Curve
Composite Curve
0
50
100
150
200
250
300
0 1000 2000 3000 4000 5000 6000 7000
Heat duty (kW)
Tem
p in
terv
al (
K) DT min
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Pinch technology series 9
Set DTmin = 20 CSet DTmin = 20 C
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Pinch technology series 10
Shifted Stream DataHot - ½DTmin; Cold + ½DTmin
NoT source,
CT target,
CHeat duty,
kWCP Type
1 210 50 3520 22 Hot
2 260 150 1980 18 Hot
3 60 220 3200 20 Cold
4 170 220 2500 50 Cold
![Page 11: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/11.jpg)
Pinch technology series 11
Shifted Composite Curve
Shifted Composite Curve
050
100150200250300
0 1000 2000 3000 4000 5000 6000 7000
Heat Duty (kW)
Tem
p in
terv
al (
K)
![Page 12: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/12.jpg)
Pinch technology series 12
Cascade Diagram
0 720 -720 SURPLUS
700 180 520 DEFICIT
2800 1600 1200 DEFICIT
400 800 -400 SURPLUS
1800 1980 -180 SURPLUS
0 220 -220 SURPLUS
22
18
20
50
260
220
210
170
150
60
50
Cold HotCold-HotStream population
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Pinch technology series 13
Heat balance in the interval
260
220
210
170
150
60
50
0
720
200
- 1000
- 600
- 420
- 200
Hot utility
-720
520
1200
-400
-180
-220
Cold utility
Heat flow
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Pinch technology series 14
The heat flow must NOT be negative
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Pinch technology series 15
Normalization
260
220
210
170
150
60
50
0
720
200
- 1000
- 600
- 420
- 200
Hot utility
-720
520
1200
-400
-180
-220
Cold utility
Need additional
heat
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Pinch technology series 16
Original Grand Composite Curve
0
50
100
150
200
250
300
-1200 -1000 -800 -600 -400 -200 0 200 400 600 800 1000
Unfeasible region
Feasible region
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Pinch technology series 17
…finding pinch
260
220
210
170
150
60
50
1000
1720
1200
0
400
580
800
Hot utility
-720
520
1200
-400
-180
-220
Cold utility
No heat flow at this point
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Pinch technology series 18
Grand Composite Curve
0
50
100
150
200
250
300
0 500 1000 1500 2000
Heat duty (kW)
Tem
p in
terv
al (K
)
Qh min
Qc min
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Pinch technology series 19
finally….finally….The PINCH POINT = 170 CThe PINCH POINT = 170 C
which means thatwhich means that
Hot stream PINCH = 170+Hot stream PINCH = 170+½DTmin = 180½DTmin = 180
Cold stream PINCH = 170-Cold stream PINCH = 170-½DTmin = 160½DTmin = 160
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Pinch technology series 20
Heat source and sink
Heat source this part releases heat
Heat sink this part requires heat
Composite Curve
0
50
100
150
200
250
300
0 1000 2000 3000 4000 5000 6000 7000
Heat duty (kW)
Tem
p in
terv
al (K
)
PINCH
Heat Source Heat Sink
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Pinch technology series 21
and, and, how can we design HEN how can we design HEN
based on the pinch?based on the pinch?
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Pinch technology series 22
Base case….the existing network
Heat recovery = 1980 + 880 = 2860 kW
Cold utility = 2640 kW
Hot utility = 1220 + 1620 = 2840 kW
22060
270160
21050
160
210H
C
H H
2640
1620
880
1980
1220
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Pinch technology series 23
Let’s start from Let’s start from the pinchthe pinch
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Pinch technology series 24
22060
270160
21050
160
210
180
180
160
160
2200
PIN
CH
AT
170
0
360
2640
1000
2500
1640
880
20
50
18
22
CPBELOW ABOVE
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Pinch technology series 25
Rules….
CP in ≤ CP out Start finding partners for streams OUT (with streams IN,
away from pinch, or utility)
N stream IN ≤ N stream out If Ns IN > Ns OUT, split stream(s) OUT
If CP in > CP out (no match), try to split stream(s) IN Set maximum heat recovery The remaining heat duty is covered by heater or
cooler
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Pinch technology series 26
22060
270160
21050
160
210
1
180
2200
1
180
160
160
2200 √√
Step 1: Below the PINCH
Connect S1(22) and S3(20)
CP in < CP out
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Pinch technology series 27
22060
270160
21050
160
210
1
180
2200
1
180
160
160
2200 √√
2
2
1620√√1620
Step 2: Above the PINCH
Connect S2(18) and S4(50)
CP in < CP out
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Pinch technology series 28
22060
270160
21050
160
210
1
180
2200
1
180
160
160
2200 √√
2
2
1620√√1620
3
3
880
880
√√
2500√√
Step 3: Above the PINCH
Connect S1(22) and S4(50)
CP in < CP out
![Page 29: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/29.jpg)
Pinch technology series 29
22060
270160
21050
160
210
1
180
2200
1
180
160
160
2200 √√
2
2
1620√√1620
3
3
880
880
√√
2500√√
H
1000
1000√√
Step 4: Above the PINCH
Install Heater at S3(20)
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Pinch technology series 30
22060
270160
21050
160
210
1
180
2200
1
180
160
160
2200 √√
2
2
1620√√1620
3
3
880
880
√√
2500√√
H
1000
1000√√
C
C
360
360
2640
440
√√
√√
Step 5: Below the PINCH
Install Cooler at S1(22) and S2(18)
All heat requirements have been All heat requirements have been met !!!met !!!
![Page 31: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/31.jpg)
Pinch technology series 31
22060
270160
21050
160
210
H
2200
440
1000
1620
880
C
360
C
…finally…Heat Exchanger Network (HEN)
Maximum Energy Recovery (MER) = 2200 + 880 + 1620 = 4700 kW
Minimum cooling heat duty (Qc min) = 440 + 360 = 800 kW
Minimum heating heat duty (Qh min) = 1000 kW
![Page 32: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/32.jpg)
Pinch technology series 32
Then draw the flowsheet…
Reactor
50 C
160 C
270 C210 C
210 C220 C
60 C
130 C
160 C
880
1620
2200440
360
1000
177.6 C
180 C
180 C
80 C
160 C
![Page 33: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/33.jpg)
Pinch technology series 33
Possible modifications
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Pinch technology series 34
Grand Composite Curve
0
50
100
150
200
250
300
0 500 1000 1500 2000
Heat duty (kW)
Tem
p in
terv
al (K
)
Heat generation
Cooling water
MP steam
![Page 35: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/35.jpg)
Pinch technology series 35
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Pinch technology series 36
Working Session Working Session
![Page 37: Pinch technology series1 By: Anwaruddin Hisyam An Introduction to Heat Exchanger Network (HEN) Design.](https://reader033.fdocuments.in/reader033/viewer/2022051620/56649f055503460f94c196b4/html5/thumbnails/37.jpg)
Pinch technology series 37
Feed 2
Feed 1
H= 27 MW
H=32 MW
H= -31.5 MW
H=-30 MW
140 C
250 C
230 C
40 C
40 C
40 C
180 C
20 C
200 C
80 C
Product 2
Product 1
Reactor 1
Reactor 2
How will the HEN be….?