Environmental Engineering Reference
In-Depth Information
The Grid Diagram for the Step -By-Step HEN Design
Pinch
CP
(kW/ ºC)
310 ºC
QH_min = 2870 kW
330 ºC
520 ºC
H1=10
Q= 350 kW
380 ºC
300 ºC
H2=5
550 ºC
300 ºC
317.5 ºC
C1=20
380 ºC
320 ºC
C2=2
QC_min = 50 kW
300 ºC
Figure 22. Grid Diagram for H2-C1 matching above the pinch at the pinch
The hot stream H1 has a heat load of 1900 kW and hence the process to process heat
exchange between H1-C1 match shall be 1900 kW which is now the duty of this heat
exchanger as shown in figure 23 below.
The Grid Diagram for the Step -By-Step HEN Design
Pinch
CP
(kW/ ºC)
310 ºC
QH_min = 2870 kW
Q= 1900 kW
520 ºC
330 º
C
H1=10
Q= 350 kW
380 ºC
300 ºC
H2=5
550 ºC
300 ºC
412.5 ºC
317.5 ºC
C1=20
380 ºC
320 ºC
C2=2
QC_min = 50 kW
300 ºC
Figure 23. Grid Diagram for H1-C1 matching away from the pinch
