余热排出泵机械密封冲洗水温度高理论分析  

Theoretical Analysis of High Temperature of Mechanical Seal Water in Residual Heat Removal Pump

作　　者：李波 赵亮 孙敏[2] 范瑞波 许德忠 孔令杰 牛红军[2] 

机构地区：[1]中广核工程有限公司,广东深圳518124 [2]沈阳鼓风机集团核电泵业有限公司,沈阳110869

出　　处：《核动力工程》2018年第1期152-156,共5页Nuclear Power Engineering

摘　　要：某核电站余热排出泵在高温备用工况下,出现机械密封冲洗水温度测点值超出高高报警值的问题。通过对不同传热因素的梳理与排查,建立该问题的根本原因分析故障树。研究发现热屏在径向的位置对密封腔温度的影响较大,为±0.458℃/mm;热屏大小存在最优值,使得密封腔介质温度最小;在冷却水流量小于5m^3/h时,冷却水流量增加对降低密封腔温度贡献较大;轴套间隙变化0.1 mm使得密封腔介质温度降低14℃,对该问题起主要影响;环境温度由16℃上升至45℃时,密封腔介质温度升高0.13℃。On the hot standby condition of the residual heat removal pump in a nuclear power plant, the temperature at the measurement points of the mechanical seal water exceeds the alarm value. To deal with this issue, the root cause analysis （RCA） tree is established. Methods of CFD analysis and classical thermodynamics theory are implemented. The study found that in the radial position, the heat shield has greater effect on the temperature in the cooling chamber, which is ±0.458 ℃/mm. The cooling chamber size have the optimize value for temperature of mechanical seal water. And when the cooling water rate is less than 5m3/h, it increase is obviously for this issue. Study found the sleeve clearance is the major factor, when the value change 0.1 mm, the temperature of mechanical seal water reduced 14 ℃. The ambient temperature increased from 16 ℃ to 45 ℃, the temperature rise 0.13 ℃.

关 键 词：余热排出泵 高温备用 根本原因分析故障树 轴套间隙 

分 类 号：TH38[机械工程—机械制造及自动化]