700℃超超临界燃煤发电机组热力系统设计及炯分析

根据MC（MasterCycle）系统的框架结构，设计了基于MC的1000MW、700℃超超临界燃煤发电机组热力系统，确定了相关的热力参数，同时设计了基于常规热力系统结构的对比系统．将这2个热力系统划分为锅炉、汽轮机、发电机、凝汽器和管道共5个单元，采用炯分析法计算了各单元的炯损、焖损系数和焖效率指标．结果表明：采用MC系统机组的热经济性比常规热力系统机组的热经济性高，主要体现在MC系统机组中汽轮机系统的热经济性较高，尤其是MC系统机组中汽轮机系统的中压缸、第3～6级加热器具有更高的热经济性．

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 de- signed based on conventional structures. Both the thermodynamic systems were divided into 5 units, inclu- ding the boiler, steam turbine, generator, condenser and pipeline, and three indexes of each unit including the 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 sys- tem, especially in the higher thermo-economy of the IP cylinder and of the heaters at stages 3 to 6.