Design and Exergy Analysis on Thermodynamic System of a 700 ℃ Ultra Supercritical Coal-fired Power Generating Set

According to the frame structure of MC (Master Cycle) system, a thermodynamic system was designed for 1 000 MW, 700 ℃ ultra supercritical coal-fired power generating set based on MC, during which the thermodynamic parameters were determined, while a comparative thermodynamic system designed based on conventional structures. Both the thermodynamic systems were divided into 5 units, including the boiler, steam turbine, generator, condenser and pipeline, and three indexes of each unit includingthe exergy loss, exergy loss coefficient and exergy efficiency were calculated by exergy analysis method. Results show that the power generating set based on MC system has higher thermo-economy than that based on conventional system, mainly indicating in the higher thermo-economy of the steam turbine system, especially in the higher thermo-economy of the IP cylinder and of the heaters at stages 3 to 6.