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248 Cha p te r T e n
Answer to (b). The minimum wastewater is targeted as follows:
Minimum flow rate Mass pickup at pinch
Pinch concentration
9 [kg/h] 910 ª 6 « kg º »
100 [ppm] 100 ¬ h ¼
910 ªº
3
t
«» 90 [t/h]
100 ¬¼
h
See Figure 10.31.
FIGURE 10.30 Combined limiting water profi les for Problem 8(a).
800
C [ppm] 400
(Minimum flowrate 90 t/h)
Pinch Water Supply Line Minimize
flowrate
100
0
1 9 21 41
m [kg/h]
FIGURE 10.31 Minimum wastewater targeting for Problem 8(b).
