Page 62 - Handbook of Energy Engineering Calculations

turbogenerator used in central-station, industrial, marine, and other plants.

REHEAT-REGENERATIVE TURBOGENERATOR ENERGY
ANALYSIS

A turbogenerator operates on the reheating-regenerative cycle with one stage
of reheat and one regenerative feedwater heater. Throttle steam at 400 lb/in 2

(abs) (2756.0 kPa) and 700°F (371.1°C) is used. Exhaust at 2-in (5.08-cm)
2
Hg is taken from the turbine at a pressure of 63 lb/in (abs) (434 kPa) for both
reheating and feedwater heating with reheat to 700°F (371.1°C). For an ideal
turbine working under these conditions, find: (a) Percentage of throttle steam

bled for feedwater heating; (b) Heat converted to work per pound (kg) of
throttle steam; (c) Heat supplied per pound (kg) of throttle steam; (d) Ideal
thermal efficiency; (e) Other ways to heat feedwater and increase the

turbogenerator output. Figure 2 shows the layout of the cycle being
considered, along with a Mollier chart of the steam conditions.