机组调峰对汽轮机导汽管焊缝开裂的影响及动态应力测试技术初探
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摘要
从近年来多台火电机组出现的高压导汽管焊缝开裂事故出发,结合电站异种钢焊接接头早期失效问题,阐述了火电机组调峰时疲劳载荷对金属部件失效的影响,首次提出了采用高温应变片对超临界机组的导汽管焊缝动态应力进行测试的方法。通过对某调峰机组高压导汽管焊缝多点应变的实际测试,形成了一套从现场应变片布置到数据采集与分析的技术路线,为下一步实现机组焊缝动态应力的在线监测、定量描述机组变负荷运行时疲劳载荷对承压管道焊缝开裂的影响奠定了基础。
Inspired by the weld crack of high pressure steam pipes of some thermal power units in recent years and combined with the early failure of dissimilar steel joints of power plant, the influence of fatigue load caused by the peak regulation of unit on the failure of the metal components was stated, the dynamic stress testing technique at the weld area of steam pipes of supercritical unit by using the high-temperature strain gage was purposed first. A technology route from the strain gage arrangement to data collection and analysis was created by the multipoint strain test of the weld area of high-pressure steam pipes of a peak regulation unit. This technique provides a basis that the on-line monitoring of the dynamic stress at weld area of unit and quantitatively analyzing the influence of the fatingue load on the weld crack of pressure pipes under variable load operation of the unit can be realized.
Inspired by the weld crack of high pressure steam pipes of some thermal power units in recent years and combined with the early failure of dissimilar steel joints of power plant, the influence of fatigue load caused by the peak regulation of unit on the failure of the metal components was stated, the dynamic stress testing technique at the weld area of steam pipes of supercritical unit by using the high-temperature strain gage was purposed first. A technology route from the strain gage arrangement to data collection and analysis was created by the multipoint strain test of the weld area of high-pressure steam pipes of a peak regulation unit. This technique provides a basis that the on-line monitoring of the dynamic stress at weld area of unit and quantitatively analyzing the influence of the fatingue load on the weld crack of pressure pipes under variable load operation of the unit can be realized.
引文
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[8]胡加瑞,刘旺,谢亿,等.末级过热器12Cr2MoWVTiB/TP347H异种钢焊口失效分析[J].矿冶工程,2015,35(1):123-125.
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[11]裴世英,朱小令.调峰机组的汽轮机转子寿命研究[J],热力发电,1985(6):16-24.
[2]蔡志强,林雪松,邓永龙,等.高温再热器Super304H与T91异种钢接头开裂失效分析[J].四川电力技术,2016,39(2):88-90.
[3]蔡文河,赵卫东,杨富,等.TP347H与12Cr1MoV异种钢焊接接头早期失效研究[J].中国电力,2009,42(4):22-24.
[4]李新梅,张忠文,邹勇,等.T92/Super304H异种钢焊接接头的性能研究[J].材料导报B,2011,25(9):99-101.
[5]姜孝春.镍基填充材料在异种钢接头中的应用[J].焊接技术,2007,36(3):49-51.
[6]李萌盛,邹德安.电站锅炉异种钢焊接接头中的热疲劳现象研究[J].热力发电,1997(6):48-50.
[7]岳亮.浅谈600MW等级超临界工程屏过、末过异种钢焊口断裂问题[J].锅炉制造,2014(1):26-28.
[8]胡加瑞,刘旺,谢亿,等.末级过热器12Cr2MoWVTiB/TP347H异种钢焊口失效分析[J].矿冶工程,2015,35(1):123-125.
[9]吕学勤,刘刚,黄自元.电力调峰方式及其存在的问题[J].电站系统工程,2007,23(5):37-40.
[10]Dooley R B,Stephenson G G,丛欣滋.Ontario Hydro电厂锅炉管子异种钢接头的实验[J].锅炉技术,1983(2):16-24.
[11]裴世英,朱小令.调峰机组的汽轮机转子寿命研究[J],热力发电,1985(6):16-24.