Engineering, 17.04.2020 16:19, dinosaur10
A 250-MW vapor dominated hydrothermal powerplant uses well steam that is saturated at 450 psia at shutoff. The steam is throttled to a turbine inlet pressure of 140 psia. A direct-contact condenser operates at a pressure of 5 psia with a cooling-water inlet temperature of 48°F. The turbine polytopic efficicency is .8 and the turbine-generator combined mechanical-electrical efficiency is .90. Calculate
(a) the steam mass flow rate, in pounds mass per hour,
(b) the condenser cooling water mas flow rate, in pounds mass per hour
(c) the cycle thermal efficiency and heat rate, in BTUs per kilowatt hour, and
(d) the difference between well flow and disposal flow, in pounds mass per hour, if the cooling tower losses by evaporation and drift are 2 percent.
Answers: 1
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