Page 91 - Sustainability in the Process Industry Integration and Optimization

68 Cha p te r F o u r

T* T*

HP Steam HP Steam
Generation Generation

LP Steam use

CW CW
ΔH ΔH
FIGURE 4.24 Exploiting a GCC pocket for utility substitution.

T*

T CW

−5°C

−40°C

−70°C
ΔH
FIGURE 4.25 Placing refrigeration levels for pure refrigerants.

the GCC. In this case, the Balanced Composite Curves (BCCs) are
used. Figure 4.26 shows how the data about the placed utilities can be
transferred from the GCC to the BCCs, enabling the correct location
of the Utility Pinch associated with LP steam.
The BCCs create a combined view in which all heat sources and
sinks (including utilities) are in balance and all Pinches are shown.