摘要
低温球阀是液化天然气(LNG)接收站中必不可少的流体管道控制装置之一,其在低温工况下工作时阀座密封易发生泄露,严重威胁工业生产的正常运行。本工作基于热固耦合方法研究了LNG接收站用低温球阀唇形密封圈与阀体和阀座的接触特性,包括接触间隙和接触压力。结果表明,受低温介质的影响,唇形密封圈上存在较大温差,导致密封圈上的Mises应力大幅增加,最大Mises应力达到204.92 MPa。相比于常温工况时,低温工况时唇形密封圈的接触间隙变大,接触压力减小,最大接触间隙值达到-0.72 mm。增大弹簧预紧力在一定程度上可以改善低温工况时唇形密封圈的密封性能,增大接触压力。本工作对低温球阀的阀座密封设计和研究具有一定参考价值。
The cryogenic ball valve is one of the indispensable fluid pipeline control devices in liquefied natural gas(LNG)receiving terminal.Its reliability directly affects the stability of the entire system,especially,when the ball valve has a serious valve seat seal leakage problem,which will seriously threaten the normal operation of industrial production and the safety of operators.In this work,based on the thermo-solid coupling method,the software of ANSYS Workbench was adopted to simulate the contact characteristics,including contact gap and contact pressure,of the lip seal of the cryogenic ball valve used in the LNG receiving station.Firstly,the distribution of temperature and Mises stress of lip seal under low-temperature conditions were analyzed.It was found that there were significant temperature differences in the lip seal,and the maximum temperature difference of the lip seal ring was 77℃.The temperature on the path from the inner lip seal ring to the outer lip seal ring decreased in order,which results in a significant increase of Mises stress.The maximum Mises stress reaches 204.92 MPa.Secondly,the contact characteristics of the lip seal under normal temperature and low-temperature conditions were analyzed.The results showed that the contact gap between the lip seal ring and the valve body and seat was unchanged,and the maximum contact pressure was evenly distributed along the circumferential direction under normal temperature conditions.While the contact gap of the lip seal increased and the contact pressure decreased under low-temperature conditions.The maximum contact gap reached-0.72 mm.Finally,the effects of different spring forced on the contact characteristics of the lip seal under low-temperature conditions were studied.It was found that the sealing performance of the lip seal could be improved to some extent by increasing the force.When the force of the spring was greater than 7000 N,the contact pressure between the lip seal ring and the valve body was greater than zero,and the precondition for s
作者
林振浩
李军业
金志江
钱锦远
Zhenhao LIN;Junye LI;Zhijiang JIN;Jinyuan QIAN(Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,China;CNNC SUFATechnology Industry Co.,Ltd.,Suzhou,Jiangsu 215129,China;State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou,Zhejiang 310027,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2022年第6期819-827,共9页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51875514)
浙江省重点研发计划项目(编号:2019C01025)。
关键词
低温球阀
液化天然气(LNG)
唇形密封圈
热固耦合
密封性能
接触特性
cryogenic ball valve
liquefied natural gas(LNG)
lip seal
thermo-solid coupling
sealing performance
contact characteristics
