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首页> 外文会议>IEEE International Conference on Power, Energy, Control and Transmission Systems >Case Study: Remaining Life Analysis of Creep Strength Enhanced Ferritic Steel T91 After 20 Years Operation on 600 MW Coal-Fired Power Plant
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Case Study: Remaining Life Analysis of Creep Strength Enhanced Ferritic Steel T91 After 20 Years Operation on 600 MW Coal-Fired Power Plant

机译：案例研究：600 MW燃煤发电厂20年后蠕变强度增强铁素体钢T91剩余寿命分析

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Coal-Fired Power Plant Boiler 600 MW has been operated more than 20 years. Secondary superheater outlet (SSH Outlet) tube bursts had been occurred on this unit. Long-term overheated failure mode was observed at failed tubes on three occasions which was on September 2017, April 2018, and December 2019. The design tubes are called SA-213 T91. On April 2018 and December 2019, the powerplant operator has joined hand with two different public university research institute which are called institution-1 and institution-2 to conduct tests to find the root cause of the failure by hardness test, microstructural examination, creep test and the remaining life analysis. The results of the hardness test on the fail tube on April 2018 and December 2019 were 170.84±1.98 Harness Vickers (HV) and 168–219 HV respectively compared to the new material hardness which are on the average of 258HV. On April 2018, creep tests were resulted that expected time to failure on 750°C and 72.93Mpa was 3.6hours; on 750°C and 93.46 Mpa was 0.4hours; on 650°C and 148.73Mpa was 4.3hours; on 650°C and 186.14 Mpa was 0.7hours; 550°C and 261.80Mpa was 9.6hours; 550°C and 316.05Mpa was 1.7hours. On December 2019, creep tests were resulted that expected time to failure on 680°C and 82.1Mpa was 16.290hours; on 650°C and 152Mpa was 0.84hours; last on 550°C and 201Mpa was 0.269hour. In order to operate more than 25 years, the stress should be less than 89.3Mpa according to ASME II PART D 2019. 6.9mm thickness tube has been resulted hoop stress 62Mpa. Welded metal approached resulted that tube remaining life of 570°C evaluated temperature was 54.4years. 600°C evaluated temperature resulted remaining life was 5.98years. In order to ensure that boiler was not overheated, Metal temperature monitoring and Coal blending has been applied to achieve the best result among bad conditions.
机译：燃煤发电厂锅炉600兆瓦已超过20年。在本机上发生了二次过热器出口（SSH出口）管突发。在2017年9月，2018年4月和2019年12月，在2017年9月的三个场合观察了长期过热的故障模式。设计管称为SA-213 T91。 2018年4月和2019年12月，动力运营商已加入了两次不同的公共大学研究院，称为机构-1和机构-2，进行测试，以找到硬度测试，微观结构检查，蠕变试验的故障根本原因和剩下的生活分析。 2018年4月和2019年12月的失败管硬度试验结果分别为170.84±1.98线束Vickers（HV）和168-219 HV，与平均为258HV的新材料硬度。于2018年4月，蠕变试验导致预期的750°C和72.93MPa失效的时间为3.6小时;在750°C和93.46 MPa上为0.4小时; 650°C和148.73MPa是4.3小时;在650°C和186.14 MPa上为0.7小时; 550°C和261.80MPa为9.6小时; 550°C和316.05MPa为1.7小时。 2019年12月，蠕变试验导致680°C和82.1MPa的预期失败时间为16.290小时;在650°C和152MPa上为0.84小时;持续550°C和201mpa为0.269℃。为了运行超过25年，根据ASME II部分D 2019，压力应小于89.3MPa。6.9mm厚度管已导致箍应力62MPa。焊接金属接近，导致管剩余寿命为570°C评价温度为54.4°。 600°C评估温度导致剩余寿命为5.98年。为了确保锅炉没有过热，已经应用了金属温度监测和煤炭混合来实现不良条件的最佳结果。

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