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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 >Life Assessment of 15CrMo Superheater Tubes in Power Station
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Life Assessment of 15CrMo Superheater Tubes in Power Station

机译：电站15CrMo过热器的寿命评估。

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摘要

Superheater tubes have a finite design life. Since utilities are now planning to operate generating units for longer than their original deign life. The tubes should be assessed periodically to determine the remaining life that can be expected from them. These assessment are necessary not only for estimation of remaining life, but also for avciding catastrophic failures and forced outages, for setting up inspection intervals and for operating procedures. This paper performs the remaining life maintenance in a shandong electric Power Station; the superheaters have been operating for 190000 hours. In order to properly evaluate superheaters, both destructive and nondestructive examinations are performed. A review of historical failure records for superheaters, local areas that have been susceptible to failures can be identified. Then visual examination are performed in conjunction with trending to detect signs of misalignment, corrosion, erosion and overheating of the tubes, highest operating temperature tubes should be checked carefully. The weakest tube samples are taken for destructive examination. The microstructure of each sample is then evaluated in laboratory for evidence of probable failure mechanisms at work, and the deterioration is identified. The metal-oxide-scale thickness is measured and calculation of the increase in tube metal temperature which shortened the life of the tubes. The stress rupture test procedure consisted of conductivity accelerated rupture test at temperatures above the service temperature. The stress was kept as close possible to the service stress value. Then the results are plotted as Stress-LMP curve. When the principal stress is calculated, the time to failure is calculated. Remaining life of the superheater tubes are then obtained by substacting the previous service time from the total time to failure. A well-planned remaining life evaluation must include periodic nondestructive and destructive testing, to provide condition-assessment data that are essential to ensure continued unit availability. This approach to life extension utility will enable the utility holding the costs to minimum.
机译：过热器管的设计寿命有限。由于公用事业公司现在计划运行发电机组的时间要比其最初的设计寿命更长。应定期评估试管，以确定可以预期的剩余寿命。这些评估不仅对于估计剩余寿命，而且对于避免灾难性故障和强迫停机，设置检查间隔和操作程序都是必要的。本文对山东电站进行剩余寿命维护。过热器已经运行了190000小时。为了正确评估过热器，必须执行破坏性检查和非破坏性检查。可以确定对过热器的历史故障记录的回顾，这些过热器是易受故障影响的局部区域。然后结合趋势进行目视检查，以检测管材未对准，腐蚀，腐蚀和过热的迹象，应仔细检查最高工作温度的管材。取最弱的试管样品进行破坏性检查。然后，在实验室中评估每个样品的微观结构，以寻找可能起作用的失效机理的证据，并确定劣化情况。测量金属氧化物鳞片的厚度并计算出管金属温度的升高，这会缩短管的寿命。应力断裂测试程序包括在高于使用温度的温度下进行电导率加速断裂测试。应力保持尽可能接近使用应力值。然后将结果绘制为Stress-LMP曲线。计算主应力时，将计算出失效时间。然后，通过替换从总时间到故障的先前服务时间，可以获得过热器管的剩余寿命。计划周全的剩余寿命评估必须包括定期的非破坏性和破坏性测试，以提供条件评估数据，这对于确保设备的持续可用性至关重要。这种延长寿命的实用程序将使实用程序将成本降至最低。

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