汽轮机轴端螺旋汽封的设计研究  

Design Study of Turbine Shaft End Screw Steam Seal

作　　者：孟召军[1] 梁策 孟书宇 杨子健 艾涔 王克宇 刘达 张淏 MENG Zhao-jun;LIANG Ce;MENG Shu-yu;YANG Zi-jian;AI Cen;WANG Ke-yu;LIU Da;ZHANG Hao(Shenyang Institute of Engineering,Shenyang 110136,China)

机构地区：[1]沈阳工程学院,沈阳110136

出　　处：《汽轮机技术》2023年第4期247-250,共4页Turbine Technology

基　　金：辽宁省教育厅项目(JL-1904)。

摘　　要：针对常见机组的汽轮机传统三段式轴封系统存在的漏汽(气)量较大的缺点,在不改变汽轮机的轴端长度及轴封系统设置的基础上,将原汽轮机轴端的三段直齿环型汽封的内外两段设计成一种旋向相反的非接触螺旋汽封,利用螺纹旋转斥气效应,减少汽缸内部蒸汽漏出、汽缸外部空气漏入的效果,进而降低汽轮机的漏汽损失,提高汽轮发电机组的效率。为了验证新型汽封的封汽(气)效果,利用有限元软件对在相同工况下的新老汽封的内部流动状况进行了仿真分析,对两种汽封的蒸汽漏出量与空气漏入量进行对比分析,分析结果表明:在相同工况下,新型螺旋汽封比传统梳齿汽封漏汽量减少约13%,空气漏入量减少约8%,验证了新型螺旋汽封设计的可行性,研究结果为汽轮机轴端汽封的灵活性改造提供了参考。In view of the shortcomings of large steam leakage(gas)in the traditional three-stage shaft seal system of steam turbines of common units today,on the basis of not changing the shaft end length of the steam turbine,the inner and outer two sections of the three-stage straight tooth ring steam seal of the shaft end of the original steam turbine are designed as a non-contact spiral steam seal with opposite rotation,and the effect of steam leakage inside the cylinder and air leakage outside the cylinder is reduced by using the gas repulsion effect of thread rotation,so as to reduce the steam leakage loss of the steam turbine and improve the efficiency of the turbine generator set.In order to verify the sealing effect of the new steam seal,the internal flow of the new and old steam seals under the same working conditions was simulated and analyzed by finite element software,and the steam leakage and air leakage of the two steam seals were compared and analyzed,and the analysis results showed that under the same working conditions,the steam leakage of the new spiral steam seal was reduced by about 13%and the air leakage was reduced by about 8%compared with the traditional comb tooth,which verified the feasibility of the new spiral steam seal design.

关 键 词：新型轴端汽封 漏气量 螺旋汽封 

分 类 号：TK263.2[动力工程及工程热物理—动力机械及工程]