Page 105 - Sustainability in the Process Industry Integration and Optimization

82 Cha p te r F o u r

Feed 2 140°C 4
3
230°C
Reactor 2
250°C
Product 2
180°C
Reactor 1 80°C

Off-Gas
Feed 1 1 40°C
20°C

2 40°C

Product 1, 40°C
FIGURE 4.45 Using a general process fl owsheet to represent a HEN.

FIGURE 4.46 2 250°C 4 200°C
Conventional HEN
fl owsheet.
140°C 12.5 MW
3
181.7°C
205°C 230°C
H
7.0 MW 7.5 MW
203.3°C
150°C

8.0 MW 180°C
150°C
140°C
6.5 MW
52.5°C
1
17.5 MW
106.7°C
20°C
C 10.0 MW Above the
Pinch
80°C
40°C
streams vertically. Although the Pinch location can be marked for
simple cases, it is still difficult to see. This representation makes it
difficult to express the proper sequencing of heat exchangers and to
represent clearly the network temperatures. Furthermore, changing