This paper introduces the method of online performance analysis of generating units used in the optimal operating management, which is called Heat Deviation analysis (HDA).

介绍了在机组优化运行管理工作中对机组经济性进行在线监测的基本方法，即耗差分析方法。

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Heat deviation analytical method is adopted, which is used to analyze the influences which the main operational monitored parameters have on the economic performance of the power plant unit.

采用热偏差分析方法，分析了锅炉主要运行可监控参数对机组经济性的影响。

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At present heat rate calculate of the double back pressure turbine is according to single back pressure turbine, which brings deviation of heat rate calculate.

目前双背压汽轮机是按单背压汽轮机来进行热耗率计算的，由此带来热耗率计算的偏差。

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