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REMAINING LIFETIME DIAGNOSTIC METHOD FOR STEAM TURBINE ROTOR
REMAINING LIFETIME DIAGNOSTIC METHOD FOR STEAM TURBINE ROTOR
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机译:汽轮机转子的剩余寿命诊断方法
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摘要
PURPOSE: To diagnose a remaining lifetime of a steam turbine rotor so as to enhance reliability of the rotor by measuring the hardness of a high temperature portion of the rotor after operation, and obtaining a creeping damage rate on the basis of a temperature, at which the high temperature portion is exposed, and a stress. ;CONSTITUTION: A hardness Hv of the high temperature portion of a rotor is measured in periodic inspection of a steam turbine. A hardness reducing rate ΔHv/HVo=(Hvo-Hv)/Hvo is calculated on the basis of an initial hardness Hvo of the high temperature portion of a new rotor or of the low temperature and low stress portion thereof after the actual operation of an engine. In a formula, wherein A1-A4 represent constants, by the hardness reducing rate ΔHv/Hvo, a creeping stress σ and a creeping temperature T are substituted, thus obtaining a creeping damage rate t/tr. A lifetime of the rotor is diagnosed based on the creeping damage rate t/tr. Consequently, it is possible to enhance reliability of the rotor.;COPYRIGHT: (C)1994,JPO&Japio
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机译:目的:通过测量运转后转子高温部分的硬度,并根据温度获得蠕变损坏率,从而诊断汽轮机转子的剩余寿命,从而提高转子的可靠性。暴露出高温部分,并产生应力。 ;组成:转子的高温部分的硬度Hv在蒸汽轮机的定期检查中测量。硬度降低率ΔHv/ HVo =(Hvo-Hv)/ Hvo是根据新转子的高温部分或其实际运行后的低温和低应力部分的初始硬度Hvo计算的发动机。在其中A 1 Sub> -A 4 Sub>代表常数的公式中,通过硬度降低率ΔHv/ Hvo代替蠕变应力σ和蠕变温度T,从而获得蠕变破坏率t / t r Sub>。根据蠕变损伤率t / t r Sub>诊断转子的寿命。因此,有可能提高转子的可靠性。;版权所有:(C)1994,日本特许厅&日本apio
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