转子偏心状态下分布式轴封密封特性数值模拟  

Numerical Simulation of Sealing Characteristics of Distributed Shaft Seals in Eccentric Rotor State

作　　者：卢刚 李成宝 武伟 江晓然 于升旭 胡建军[2] LU Gang;LI Chengbao;WU Wei;JIANG Xiaoran;YU Shengxu;HU Jianjun(Huaneng Power International Inc.Dalian Power Plan,Dalian,Liaoning 116000;School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066004)

机构地区：[1]华能国际电力股份有限公司大连电厂,辽宁大连116000 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《液压与气动》2025年第3期43-49,共7页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51641508);中国华能集团有限公司技术开发及应用项目(2024-GP16-61)。

摘　　要：某电厂汽轮机机组在长期工作后出现转子偏心、泄漏增大,导致机组效率显著降低。提出了一种分布式轴端汽幕自密封系统,通过多路独立供汽解决偏心下间隙密封问题,可节约蒸汽以提高机组效率。采用数值模拟方法,研究了偏心下分布式轴封内气体流动特性及密封效果。结果表明,补汽压力200 Pa是分布式轴封保证密封的最低压力,此时单一位置补汽不能达到密封要求,需多位置同时补汽可使混合气体中空气比例降至10-6,从而达到密封要求;当补汽压力达到或超过20 kPa时,双侧任意位置补汽均可满足密封要求,但蒸汽消耗会增加13.6%,而只开单侧补汽在保证密封效果的同时,最多可节省40.5%的蒸汽工质。The steam turbine at a power plant exhibited an increase in rotor eccentricity and serious leakage after prolonged operation,resulting in a significant decline in efficiency.This research proposes a distributed steam curtain self-sealing system to address the issue by employing multiple independent steam sealing modules.The steam flow characteristics and sealing effectiveness of the system are analyzed using numerical simulation.The results show that a steam pressure of 200 Pa represents the minimum threshold for ensuring effective sealing.Supplying steam at multiple positions can guarantee the sealing effect and reduce the proportion of air in the mixed gas to 10-6.When the pressure reaches or exceeds 20 kPa,supplying steam at any position can meet the sealing requirements;however,the steam consumption will increase by 13.6%.This research also discusses the single-side supplying steam on sealing effect,which can lead up to a 40.5%saving in steam.

关 键 词：汽轮机 轴端密封 转子偏心 分布式控制 

分 类 号：TH138[机械工程—机械制造及自动化] TK263[动力工程及工程热物理—动力机械及工程]