Page 266 - Handbook of Energy Engineering Calculations

FIGURE 4 Extraction cycle in which the steam for brine heating is
removed from the turbines at some midpoint during expansion.

The multishaft cycle (Fig. 5) is fundamentally the same as Fig. 3, but it
uses parallel condensing and noncondensing turbines. The electric output can
vary over a wide range without changing the water-desalting production.

Although many other cycles are possible, all are variations of the three basic
arrangements described above.

FIGURE 5 Multishaft cycle is the same as backpressure cycle, but it
uses parallel condensing and noncondensing turbines.

2. Choose the type of cycle and reactor size to use
Figure 6 allows quick estimates of the type of cycle and reactor size. Any of

the four plotted quantities can be determined from Fig. 6 when the other three
are known.