摘要
针对某大型煤化工企业所用汽轮机出现的高温蒸汽泄漏问题,对汽轮机前汽封加以改造,进行了基于蜂窝密封技术的结构设计、仿真分析和应用研究。在原始梳齿密封结构的基础上,进行了蜂窝密封结构设计;利用CFD软件对密封流场进行了仿真分析,研究了梳齿密封和蜂窝密封的密封性能差异;研究了梳齿结构、蜂窝芯格深度和蜂窝芯格直径对蜂窝密封性能的影响;最后,加工了新型蜂窝密封件,对汽轮机前汽封进行了改造,验证了蜂窝密封的密封性能。研究结果表明:结构合理的蜂窝密封能够有效地降低汽轮机高温蒸汽泄漏量;在有齿的转子结构上使用具有梳齿结构的蜂窝密封,密封性能更好;蜂窝芯格深度越深、蜂窝芯格直径越小的蜂窝密封的密封性能越好;进行蜂窝密封改造后,汽轮机径向瓦的温度降低了20℃,振动降低了45%,机组的运行效率和安全稳定性得到了提升。
Aiming at the high-temperature steam leakage problem of the steam turbine used by a large coal chemical enterprise,the front steam seal of steam turbine was reformed,based on honeycomb sealing technology,the structure design,simulation analysis and application of the steam turbine front seal were carried out.Based on the original labyrinth seal structure,the honeycomb seal structure was designed;the sealing flow field was simulated and analyzed by CFD software,and the difference in sealing performance between labyrinth seal and honeycomb seal was studied;the influence of labyrinth structure,honeycomb core lattice depth and core lattice diameter on the sealing performance of the honeycomb seal was studied.Finally,the front steam seal of the steam turbine was modified by processing new honeycomb seals to verify the sealing performance of the honeycomb seal.The research results show that the honeycomb seal with reasonable structure can effectively reduce the high-temperature steam leakage of the steam turbine;the honeycomb seal with labyrinth structure on the toothed rotor structure has better sealing performance;the deeper the depth of honeycomb core is,the smaller the diameter of honeycomb core is,and the better the sealing performance of honeycomb seal is;after the honeycomb seal modification,the temperature of the radial bush of the steam turbine is reduced by 20℃,the vibration is reduced by 45%;and the operating efficiency,safety and stability of the unit are improved.
作者
张雨霏
何立东
王胜利
亢嘉妮
朱港
ZHANG Yu-fei;HE Li-dong;WANG Sheng-li;KANG Jia-ni;ZHU Gang(Engineering Research Center of Chemical Technology Safety Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《机电工程》
CAS
北大核心
2021年第7期807-814,共8页
Journal of Mechanical & Electrical Engineering
基金
国家科技重大专项资助项目(2017-ⅠV-0010-0047)。
关键词
梳齿密封
蜂窝密封
泄漏量
计算流体力学
密封流场分析
labyrinth seal
honeycomb seal
leakage rate
computational fluid dynamics(CFD)
analysis of seal flow field
作者简介
张雨霏(1996-),男,安徽合肥人,硕士研究生,主要从事动力机械及密封流体激振方面的研究。E-mail:747469427@qq.com;通信联系人:何立东,男,教授,博士生导师。E-mail:1963he@163.com
