2020.№4大电机技术39
及数值模拟
许文君1，王成木2，岳婷2，费宇2，张思杨3
（1.内蒙古达拉特发电厂，内蒙古鄂尔多斯014399；2.四川省机械研究设计院，成都610063；
3.中国石油西南管道分公司，成都610041）
[摘要]为了提高氢冷发电机双流环密封瓦由于密封面磨损间隙增大后的密封能力，本文对密封瓦不同间 隙下密封油的流动情况进行了研究，提出了四种提高密封瓦密封能力的设计方案并对其进行了流场数值模拟。
计算结果表明：环形阻流槽+储油阻流泡组合方案在密封间隙增大情况下，对减小氢侧向空侧窜油流量效果显
著。本研究成果不仅能延长密封瓦的使用寿命，减小发电机主轴磨损，排除机组氢爆隐患，还能为发电 机密
封瓦放大密封间隙设计提供技术依据。
[关键词]氢冷发电机；双流环密封瓦；改进设计方案；数值模拟
[中图分类号]TM303[文献标志码]A[文章编号]1000-3983(2020)04-0039-06
The Improved Design and Numerical Simulation of the Double Flow Ring Sealing Tile for
Hydrogen-cooled Generator
XU Wenjun1,WANG Chengmu2,YUE Ting2,FEI Yu2,ZHANG Siyang3
(1.Inner Mongolia Dalate Power Station,Ordos014399,China;2.Sichuan Provincial Machinery
Research and Design Institute,Chengdu610063,China;3.PetroChina Southwest Pipeline Branch,
Chengdu610041,China)
Abstract:In order to improve the sealing ability of the sealing tile of hydrogen-cooled generator due
to the increase of the sealing surface wear gap,the flow of the sealing oil in different gaps is studied
and four schemes to improve the sealing ability are put forward.Meanwhile,the numerical
simulation of the flow field is carried out.The calculation results show that the combination of
annular choke groove and oil storage choke bubble has a significance effect on reducing the flow of
oil from the hydrogen side to the air side when the sealing gap is increased.The results can not only
prolong the service life of the sealing tile and reduce the wear of the main shaft of the generator,
eliminate the hidden danger of hydrogen explosion of the unit,but also provide technical basis for
the design of enlarging the seal clearance of the sealing tile.
Key words:hydrogen-cooled generator;double flow ring sealing tile;the improved design scheme;
numerical simulation
0前言
大型氢冷发电机内部都充满了具有一定压力（一般在0.4MPa左右）且纯度相对较高的氢气，用于冷却发电机定转子。为了防止氢气外漏，在发电机主轴两端各装有一套双流环或单流环浮环式密封瓦[1,2]。采用专门的密封油系统向这种非接触式密封瓦提供密封油，在密封瓦密封间隙处形成具有一定油膜刚度的液膜，由于液膜充满了整个密封间隙，压力油膜将发电机内外进行隔离，以达到密封发电机内部氢气的目的[3-6]。双流环式密封瓦有两个环形供油槽，分空侧和氢侧两个油路将密封油供给到这两个环状配油槽内，两路油沿轴向穿过密封瓦内径与转轴之间的间隙流出。其中空侧回油与轴承回油一起回到空侧油箱，氢侧回油汇集到消泡箱后流入氢侧油箱，如图1所示。
密封油密封瓦与发电机主轴之间设计间隙一般为0.12~0.14mm，新密封瓦一般能保证此间隙，此时密封瓦漏氢量在设计的许可范围内。随着机组运行时间增加，密封瓦密封面与主轴表面相互磨损，密封间隙逐渐增大，机组漏氢量增加，即发电机的密封瓦密封能力降低，漏氢量将超过设计许可范围，此时，机组不得不进行密封瓦更换及发电机主轴的修复[7-10]。氢气的
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