Reheat cycle

Basic components of steam power plant

T 1 2 3 4 S

Thermal Efficiency Thermal efficiency can be improved by T T T (a) Lowering the condensing pressure (lower condensing temperature, lower TL) (b) Superheating the steam to higher temperature ( c) Increasing the boiler pressure (increase boiler temperature, increase TH) ( c) increase pressure s T 1 2 3 4 T 3 (b) Superheating 2 s T 1 2 4 1 s Low quality, high moisture content (a) lower pressure(temp)

Reheating high-P turbine Low-P pump condenser 1 2 3 4 5 6 T s low-P boiler