应用分析方法 ,对火电厂热力系统进行了诊断。分析了系统中各主要设备和环节的热力学完善性 ,找出系统中的薄弱环节 ,并与使用传统的热平衡法取得的结果进行了比较 ,为火电厂的运行优化和节能技改提供了较为科学的依据 Application  analysis method, thermal power plant thermal system diagnosed. The thermodynamic perfection of each major equipment and links in the system is analyzed, and the weak links in the system are found out. Compared with the results obtained by the traditional heat balance method, the results provide a more scientific basis for the operation optimization and energy saving of thermal power plants The basis