Page 275 - Design of Simple and Robust Process Plants

7.5 The Optimization of an Integrated Complex 261

fuel Power
air fuel
VHP steam
WHB
Power
De -superheaters
Condensate
HP steam
Power
MP steam
Power
LP steam
Power
CW
CW

Fig. 7.2. Co-generation energy system.

HP Steam

Power
De-superheater

MP Steam

Condensate De-superheater
flash drum MP Power
Condensate
LP Steam

LP Condensate
Return Condensate
Fig. 7.3. Detail of steam header with turbine drivers, de-super-
heaters, heat exchangers and condensate collection.

demands of the complex, and form the basis for heat exchange between the plants.
Smaller sites may have one or two steam levels, while larger sites have four utility
steam levels. Smaller energy consumers may consider the application of a gas
engines instead of gas turbines. The design of such an energy system is based on
the input from the individual plants.
The below-ambient temperature systems (if applicable) are based on multi-stage com-
pression refrigeration systems, the number of levels being determined by the consu-
mers. The installation of an absorption system is very heat-intensive and only justifi-