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Life Extension Strategy for Heavy-Duty Gas Turbines after Long Operating Periods

机译：长期运行期后重型燃气轮机的生命延长策略

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Gas turbine and GUD(~R) power plants are typically designed for a useful service life of over 30 years. Essential components of SIEMENS gas turbines ― these include turbine blades and the hot-gas-path-casings ― are designed for a service life of 100,000 equivalent operating hours. If operated at base load, the hot-gas-path parts of this type of gas turbine, for example in a GUD(~R) combined-cycle power plant, would reach the end of their useful service life after only 10 to 12 years. This is well before the end overall plant service life defined in the power plant concept. Such plant applications therefore necessitate life extension measures enabling to continuing operation beyond 100,000 equivalent operating hours. In more concrete terms, this concept encompasses maintaining the original output and efficiency levels. It does, however, offer the option of implementing measures to increase power output and efficiency. This contribution gives a detailed presentation of the strategy of service life extension measures based not only on the design criteria but also operating experience gathered with SIEMENS V94.2 gas turbines. Focal points include the strategy for hot-gas-path components in the form of detailed materials investigations into the residual service life of components such as turbine blades which have been subjected to long-term operation. Evaluation criteria for the remaining gas turbine components such as the compressor blading, rotor and pressure-tight casings are also presented. The concept for service life extension measures after 100,000 equivalent operating hours was developed for implementation during a scheduled major inspection and overhaul. It is possible to calculate the impact of life extension measures on power generation costs over the plant's entire service life on this basis.
机译：燃气轮机和GUD（〜R）发电厂通常设计用于有用的使用寿命超过30年。西门子燃气轮机的基本组件 - 这些包括涡轮机叶片和热气路径 - 设计用于100,000等效工作时间的使用寿命。如果在基部负载下操作，这种燃气轮机的热气路径部件例如在GUD（〜R）联合循环发电厂中，可以在仅10到12年后到达其有用的使用寿命的结束。这在电厂概念中定义的整体植物使用寿命之前，这很好。因此，这种植物应用需要终身延长措施，从而继续运行超过100,000等效的工作时间。在更具体的条件下，该概念包括维持原始输出和效率水平。但是，它确实提供了实施措施以提高功率输出和效率。此贡献不仅根据设计标准提供了服务寿命延长措施策略的详细介绍，而且还提供了与西门子V94.2燃气轮机聚集的经营经验。焦点包括以详细的材料形式的热气路径部件的策略研究进入已经经受长期操作的涡轮机叶片的组件的残余使用寿命。还呈现了剩余燃气轮机部件的评价标准，例如压缩机叶片，转子和压力密封外壳。在预定的重大检验和大修期间开发了100,000等效运行时间后的使用寿命延长措施的概念。在此基础上，可以计算生命延长措施对植物整个使用寿命的发电成本的影响。

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