A steam power plant operate on a regenerative-reheat cycle with two-stage of steam extraction for regenerative reheating and one extraction for reheating. The turbine receives steam at 7.0 MPa and 550°C; the steam expands to 2.0 MPa isentropically, where a fraction is extracted for feedwater heating,
A steam power plant operate on a regenerative-reheat cycle with two-stage of steam extraction for regenerative reheating and one extraction for reheating. The turbine receives steam at 7.0 MPa and 550°C; the steam expands to 2.0 MPa isentropically, where a fraction is extracted for feedwater heating, and the remainder is reheated at constant pressure until the temperature is 540°C. The steam expands isentropically to 400 kPa, where a fraction is withdrawn for low-pressure feedwater heating; the remainder expands isentropically in the turbine to 7.5 kPa, at which time it enters the condenser. Calculate the percentage overall thermal efficiency. The feed pump is located after the second-stage heater.
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