600MW汽轮发电机组低压旁路阀内漏原因分析及处理
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摘要
内蒙古岱海发电有限责任公司3号机组在运行中3A、3B低压旁路阀因存在不同程度的内漏,阀后温度分别达到120℃、297℃。从旁路阀结构和安装工艺等方面进行改造:将阀座密封面由外倾式改为内倾式;增加盘根压缩量;研磨阀笼内表面和底口的氧化皮,并校正阀杆的同轴度;调整管道限位装置的间隙,消除因管道热膨胀引起阀体变形造成的阀座变形。改造后3A、3B阀后最高温度分别降至83℃、50℃,内漏问题得到解决。
3A and 3B low pressure bypass valve of unit 3 in Inner Mongolia Daihai Electric Power Generation Co.,Ltd.occured different degrees of leakage,resulting that the post valve temperature of 3A and 3B low pressure bypass valve separately reached 120℃and 297℃.The reason was discussed and transformation of sealing performance of low pressure bypass valve were carried out from the sealing surface,transformed the sealing surface of the valve seat from extroversion packing,improved the accuracy installation which grinded the oxidation skin of valve cage surface and bottom and adjusted the rod concentricity and adjusted the gap of pipeline limiting clearance device to eliminate thermal expansion caused by the thermal expansion deformation of the body and the seat.After the transformation,the maximum temperature of 3A and 3B valves separately decreased to 83℃and 50℃,and the leakage problem was solved.
3A and 3B low pressure bypass valve of unit 3 in Inner Mongolia Daihai Electric Power Generation Co.,Ltd.occured different degrees of leakage,resulting that the post valve temperature of 3A and 3B low pressure bypass valve separately reached 120℃and 297℃.The reason was discussed and transformation of sealing performance of low pressure bypass valve were carried out from the sealing surface,transformed the sealing surface of the valve seat from extroversion packing,improved the accuracy installation which grinded the oxidation skin of valve cage surface and bottom and adjusted the rod concentricity and adjusted the gap of pipeline limiting clearance device to eliminate thermal expansion caused by the thermal expansion deformation of the body and the seat.After the transformation,the maximum temperature of 3A and 3B valves separately decreased to 83℃and 50℃,and the leakage problem was solved.
引文
[1]叶涛.热力发电厂[M].北京:中国电力出版社,2012.
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[4]徐传堂.600 MW超临界高压旁路阀内漏的技术改造[J].能源研究与利用,2015(6):44-46.
[5]高胜利.低压旁路蒸汽变换阀内漏分析及处理方法探讨[J].机械工程与自动化,2015(6):186-187.
[6]李毅,李大为.关于火力发电厂汽机旁路阀的研究[J].电子技术与软件工程,2016(24):249.
[7]朱允花.电厂汽轮机旁路系统高压旁路阀泄漏经济性分析及对策[J].中国高新技术企业,2014(4):71-73.
[8]邹世浩.超临界高低压旁路阀的研究[J].锅炉制造,2013(5):54-56.
[9]沈君.300 MW汽轮机旁路阀阀瓣断裂失效分析[J].电站辅机,2014(2):47-50,54.
[2]赵宗彬,孙鹏.浅析汽轮机低压旁路内漏治理[J].电站辅机,2009,30(3):16-18.
[3]徐传堂,张大志.600 MW超临界汽轮机组高压旁路阀内漏原因分析及处理[J].节能,2009(7):54-55.
[4]徐传堂.600 MW超临界高压旁路阀内漏的技术改造[J].能源研究与利用,2015(6):44-46.
[5]高胜利.低压旁路蒸汽变换阀内漏分析及处理方法探讨[J].机械工程与自动化,2015(6):186-187.
[6]李毅,李大为.关于火力发电厂汽机旁路阀的研究[J].电子技术与软件工程,2016(24):249.
[7]朱允花.电厂汽轮机旁路系统高压旁路阀泄漏经济性分析及对策[J].中国高新技术企业,2014(4):71-73.
[8]邹世浩.超临界高低压旁路阀的研究[J].锅炉制造,2013(5):54-56.
[9]沈君.300 MW汽轮机旁路阀阀瓣断裂失效分析[J].电站辅机,2014(2):47-50,54.