In a reheat-regenerative steam cycle, steam enters the h.p. turbine at 80 bar, 480 °C and expands to 7 bar. The steam is then reheated to 440 °C before entering the l.p. turbine, where it expands to the condenser pressure of 0.08 bar. Steam extracted from the h.p. turbine at 20 bar is fed to a closed feedwater heater, from which the drain at 205 °C is cascaded to an open feedwater heater through a trap. Steam extracted from the l.p. turbine at 3 bar is also fed into the open feedwater heater, from which the total flow is pumped into the steam generator. The net power output of the cycle is 100 MW. Assuming ideal processes, determine (a) the cycle efficiency, and (b) the rate of steam generation in kg/h.
In a reheat-regenerative steam cycle, steam enters the h.p. turbine at 80 bar, 480 °C and
expands to 7 bar. The steam is then reheated to 440 °C before entering the l.p. turbine,
where it expands to the condenser pressure of 0.08 bar. Steam extracted from the h.p.
turbine at 20 bar is fed to a closed feedwater heater, from which the drain at 205 °C is
cascaded to an open feedwater heater through a trap. Steam extracted from the l.p. turbine
at 3 bar is also fed into the open feedwater heater, from which the total flow is pumped
into the steam generator. The net power output of the cycle is 100 MW. Assuming ideal
processes, determine (a) the cycle efficiency, and (b) the rate of steam generation in kg/h.
[Ans. (a) 43%, (b) 2.8 × 105 kg/h]
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