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Effects of two-shift operation on the remaining life of heat recovery steam generators

机译：二班制操作对余热回收蒸汽发生器剩余寿命的影响

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The author (C. D., ERA Technology) stated that some HRSG's were designed for base load (and had sparse instrumentation), and introduced a case study where exhaust from a natural gas fired gas turbine (150 MW) generated HP steam at 8.6 MPa and 510 deg C for the steam turbine and IP and LP steam for ancillary purposes. Cyclic-induced stresses had pointed up certain design weaknesses and installed monitoring had identified cyclic damage mechanisms in critical boiler components. In the gas turbine, the exhaust gases flowed through vertically suspended tube banks. The unit had run for 60,000 h with over 200 starts and over 100 trips.A phased approach' to the problem was described in detail. In Phase 1, plant records were consulted and components at risk identified. In Phase 2 during an outage, condition assessment was performed on selected points e.g. superheaters, welds and ligaments. Based on this initial assessment, locations were selected for further thermo-coupling e.g. superheater outlets and economiser inlet headers. Phase 3 concerned data collection. This covered 4 months of normal operation, 6 shutdown/start up transients and the subsequent analysis.
机译：作者（CD，ERA Technology）表示，某些HRSG是为基本负荷而设计的（并且仪表稀疏），并介绍了一个案例研究，其中天然气燃气轮机（150 MW）的废气产生了8.6 MPa和510的高压蒸汽蒸汽轮机的温度为℃，辅助用途的IP和LP蒸汽的温度为℃。周期性的应力已经指出了某些设计上的弱点，安装的监控器已经确定了关键锅炉部件中的周期性损坏机理。在燃气轮机中，废气流过垂直悬挂的管束。该装置运行了60,000小时，启动了200多次，行程超过100次。详细描述了解决该问题的分阶段方法。在第一阶段中，查阅了工厂记录并确定了有风险的组件。在中断期间的第2阶段中，对选定的点（例如，过热器，焊缝和韧带。基于此初步评估，选择了进一步热耦合的位置，例如过热器出口和省煤器入口集管。第三阶段涉及数据收集。这涵盖了4个月的正常运行，6次关机/启动瞬态以及后续分析。

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