核电汽轮机相对内效率测量方法研究

Study on Measurement Methods of Relative Internal Efficiency of Nuclear Steam Turbine

汽轮机的相对内效率是反映汽轮机运行经济性状态及通流部分运行状态的一项重要指标。核电汽轮机采用湿蒸汽作为工作介质,无法通过测量汽轮机各回热抽汽点和排汽点的湿度准确来确定汽轮机的相对内效率。通过对功率型相对内效率及焓降型相对内效率的分析比较发现,汽轮机通流部分运行状态发生变化时,两种相对内效率均可以反映出汽轮机通流部分的运行状态;汽轮机回热系统运行状态发生变化时,功率型与焓降型相对内效率在反映汽轮机通流部分运行经济状态方面是等效的,可以任选一种相对内效率作为汽轮机经济性能的评价指标。

The relative internal efficiency for steam evaluating the flow path conditions of steam turbines. The in wet steam area. The relative internal efficiency may not turbine is one of the main economic indexes in steam turbine used in nuclear power plant works be obtained accurately through measuring of the wetness Of regenerative extraction steam and e,xhaust steam. In this paper, by analyzing and comparing the enthalpy dropping and power types relative internal efficiency, it is found that when the operation conditions of the flow path in steam turbines change, both the two kinds of relative internal efficiency can reflect the operation conditions of the flow path in steam turbines. Also, when the operation conditions of regenerative system change, the enthalpy dropping and power types relative internal efficiency are equivalent. So either one can be used as the economic index for nuclear steam turbine.