核主泵推力轴承断冷却水工况磨损机理研究  

Study on Wear Mechanism of Thrust Bearing of Nuclear Main Pump in Cooling Water Loss Condition

作　　者：蔡龙 王伟光 雷明凯[1] 李梦启 朱宝[1] 苏先顺[4] Cai Long;Wang Weiguang;Lei Mingkai;Li Mengqi;Zhu Bao;Su Xianshun(School of Materials Science and Engineering,Dalian University of Technology,Dalian,Liaoning,116024,China;Engineering Research Center of RCP Heilongjiang Province,Harbin,150060,China;Harbin Electric Power Equipment Company Limited,Harbin,150060,China;Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]黑龙江省核主泵工程技术研究中心,哈尔滨150060 [3]哈尔滨电气动力装备有限公司,哈尔滨150060 [4]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2021年第4期214-221,共8页Nuclear Power Engineering

基　　金：国家科技重大专项(2019ZX06002009)。

摘　　要：核主泵在核电厂断水工况下,其推力轴承失去冷源换热,推力轴承润滑介质将因轴承温度上升而不断提高润滑介质的温度,并伴随发生较复杂的热瞬态工况。当推力轴承润滑液膜厚度严重降低时,因液膜厚度不足而引发摩擦副的部分接触磨损。对某台核主泵断水试验后拆机检查,并经润滑分析断水运行工况下的磨损规律,断水工况磨损后若再进行全厂断电(SBO)惰性停机,瓦面随着磨损深度增加,轴承油膜厚度降低至无法可靠运行程度,损耗增加且伴随着油膜温度超过巴氏合金运行极限温度110~120℃,易引发轴承严重磨损。本研究可为优化轴承及提高磨损后SBO惰性停机的耐磨损能力提供理论支撑。When the nuclear main pump is in the cooling water loss condition of the nuclear power plant,its thrust bearing loses cold source heat transfer.The temperature of the lubricating medium of the thrust bearing will be continuously increased due to the temperature rise of the bearing,which is accompanied by more complicated thermal transient conditions.When the thickness of the lubricating liquid film of the thrust bearing is seriously reduced,the contact wear of the friction pair occurrs due to the insufficient thickness of the liquid film.A nuclear main pump is disassambled and checked after a water cut-off test,and the wear pattern of the water cut-off operating conditions through lubrication is analyzed.When the station blackout(SBO)inert shutdown is carried out in the water cut-off condition,with the increasing of wear depth,the oil film thickness of the bearing decreases to the extent that it cannot operate reliably,and the loss increases.With the oil film temperature exceeding the Babbitt alloy operating limit temperature of 110-120℃,serious wear of the bearing is prone to occur.It provides a theoretical support for optimizing the bearings and improving the wear resistance of multiple SBO inert shutdowns after wear.

关 键 词：核主泵 推力轴承 断冷却水工况 磨损机理 全厂断电(SBO) 

分 类 号：TL353[核科学技术—核技术及应用]