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首页> 外文会议>International Conference on Life Management and Life Extension of Power Plant May 18-20, 2000, Xi'An, China >REQUALIFICATION OF STEAM TURBINE COMPONENTS AFTER LONG TIME SERVICE - PROCEDURE AND EXPERIENCE -
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REQUALIFICATION OF STEAM TURBINE COMPONENTS AFTER LONG TIME SERVICE - PROCEDURE AND EXPERIENCE -

机译：长期服务后汽轮机组件的重新验证-过程和经验-

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摘要

Man Operation Turbine have reached or even exceeded their design life. To assure continued safe, reliable and economic operation we recommend checking the highly-stressed main components with respect to their remaining life by calculation and non destructive examination. It is the aim of such an evaluation to obtain reliable predictions of the remaining life of main turbine components. In the case of most older turbines it is advisable to check the remaining service lifetime of the essential components such as casings, turbine and generator shafts, valves, bolts, pipings and retaining rings. Turbine lifetime is mainly determined by the design criteria, material properties and operating conditions. Accurate prediction will only be possible by high quality lifetime evaluations taking into account all design considerations, the overall material properties, as well as component properties at critical locations and a realistic description of the operating conditions. For the combined creep / low cycle fatigue lifetime expenditure, a so call "warning point" concept is used. If a component is approaching the warning point, a detailed analysis of the material data base -positioning the material properties relative to the design curves -as well as of the non-destructive tests results is required to determine whether any future operation can be safely recommended. To avoid brittle fracture failure in solid rotors or rotor with shrunk on discs, a comprehensive mechanised ultrasonic test is performed in order to determine the safety relevant defect. If there are axial- or radial bore holes in the rotor, a special bore inspection system is applied. The inspection system uses digital acquisition and computerized data evaluation. Today, the turbine designer has the tools to properly evaluate long-term operation of units and can also make accurate predictions regarding to reliable long-term, operation of older turbines. The results of lifetime assessment and component investigation may lead to specific recommendations on possible measures for the users. They concern repair by machining or welding, crack controls at . determine intervals, design improvements, improved control system, optimised operating condition and, if necessary, replacement of exhausted parts. Based on the above mentioned features, an extension of lifetime and a possible increasing turbine output and efficiency can be reached. With economical analyses it is possible to decide whether increased inspection efforts and shorter inspection intervals, component modification or replacement offers the best solution. Remaining lifetime evaluations ensure operational safety and reliability and also a longer operation of the Power Plant.
机译：汽轮机已经达到甚至超过了设计寿命。为了确保持续的安全，可靠和经济的运行，我们建议通过计算和无损检查来检查高应力主要部件的剩余寿命。评估的目的是获得主要涡轮机部件剩余寿命的可靠预测。对于大多数较旧的涡轮机，建议检查基本组件的剩余使用寿命，例如机壳，涡轮机和发电机轴，阀门，螺栓，管道和固定环。汽轮机寿命主要由设计标准，材料性能和运行条件决定。只有通过考虑所有设计考虑因素，整体材料特性以及关键位置的组件特性以及对运行条件的真实描述，高质量的使用寿命评估才能实现准确的预测。对于蠕变/低周疲劳寿命总支出，使用了所谓的“警告点”概念。如果组件接近警告点，则需要对材料数据库进行详细分析（相对于设计曲线放置材料属性）以及无损测试结果，以确定是否可以安全地建议将来进行任何操作。为避免实心转子或圆盘缩紧的转子发生脆性断裂故障，为了确定与安全相关的缺陷，进行了全面的机械化超声测试。如果转子中有轴向或径向孔，则应使用特殊的孔检查系统。该检查系统使用数字采集和计算机数据评估。如今，涡轮机设计人员拥有可正确评估机组长期运行的工具，并且还可以对老式涡轮机的可靠长期运行做出准确的预测。寿命评估和组件调查的结果可能会为用户提供有关可能措施的具体建议。他们关注通过机加工或焊接进行维修，以及进行裂纹控制。确定间隔，设计改进，改进的控制系统，优化的运行条件，并在必要时更换用完的零件。基于上述特征，可以延长使用寿命并可能增加涡轮机的输出和效率。通过经济的分析，可以决定增加检查工作量和缩短检查间隔，部件更换或更换是否是最佳解决方案。剩余的使用寿命评估可确保运行安全性和可靠性，并确保电厂的运行时间更长。

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