二次再热汽轮机性能试验系统修正计算研究

Research on System Correction of Performance Test for Double-reheat Steam Turbine

研究了典型热力系统配置的二次再热汽轮机性能试验的系统修正中各抽汽压力及抽汽焓的求取方法,提出了二次再热汽轮机性能试验的系统修正计算方法。以某660 MW、1000 MW二次再热汽轮机为例进行算例分析,验证了计算方法的可行性,对比了求取抽汽焓时定缸效率截取法与定级组效率截取法的热力过程膨胀线差异。结果表明:基于试验膨胀线法,结合定缸效率截取进行系统修正计算相对更优。

Calculation methods of extraction steam pressure and enthalpy in system correction of performance test for typical thermal system configured double-reheat steam turbines were researched and corresponding system correction methods were proposed.Design and performance test data of 660 MW and 1000 MW double-reheat steam turbines were analyzed and the calculation methods were verified to be feasible.Characteristics of turbine cylinder efficiency interception method were compared with stage efficiency interception method.Results show that it is better to adopt turbine cylinder efficiency interception based on test expansion line method under performance test system correction.