Page 255 - Sustainability in the Process Industry Integration and Optimization

232 Cha p te r T e n

Q [MW] Q [MW] Pinch (hot/cold) [°C]
H,min H,min
Process A 2.852 14.955 124 / 114
Process B 1.800 0 None (threshold problem)

TABLE 10.13 Heat Recovery Targets for Problem 4(a)

∗
T [°C]
(2.9; 165.0)
160
140 (0.3; 148.0)
(0.3; 121.0)
120
(8.9; 85.0)
100
(0; 119.0)
(10.3; 79.0)
80
(9.9; 80.0)
60
40
20 (15.0; 32.5)
0
0 2 4 6 8 10 12 14 ΔH [MW]
FIGURE 10.13 GCC for process A [Problem 4(a)].

T* [°C]
(1.8; 175.0)
180
(0.5; 163.3)
160 (2.6; 164.9)
140
120 (1.4; 130.6)
100
(3.1; 100.0)
80
60 (1.8; 75.0)
40
20
(0; 15.0)
0
0 0.5 1 1.5 2 2.5 3 ΔH [MW]
FIGURE 10.14 GCC for process B [Problem 4(a)].

Answer to (b). The TSPs for the combination of the two processes are plotted in
Figure 10.15. The apparent temperature overlap of the profiles indicates a good
opportunity for heat recovery.
Answer to (c). The heat recovery on the site can only take place via the steam
system. Any steam raised from process cooling has to be utilized to the greatest