Fluid Dynamics and Contact Stress on Hard Sealing Surface Analysis of LNG Cryogenic Ball Valve

Zhen-hao Lin, Jiaqing Lu, Jun-ye Li, Jingjing Qian
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Abstract

LNG (liquefied natural gas) cryogenic ball valve (CBV) is an important flow control device in LNG receiving stations. Its reliability directly affects the stability of the pipeline system, especially its damage or leak in the seat seal will seriously threaten the normal operation and the safety of LNG receiving stations. When LNG flows through the CBV, due to the interaction between fluid pressure and the valve structure, the hard sealing at the valve seat is not only subjected to the pre-tightening force of saucer spring, but also affected by the fluid pressure of the complex flow. Therefore, it is necessary to study the flow characteristics in the CBV and the hard sealing performance affected by the LNG. In this paper, the fluid dynamics and the contact stress on hard sealing performance in the CBV are analyzed. The pressure drop, pressure, and velocity distributions were analyzed, respectively. The contact stress on the hard sealing surfaces of the CBV with fluid pressure was analyzed by the fluid-structure coupling method. This work has a certain reference value for researching and mastering the hard sealing performance of cryogenic ball valves.
LNG低温球阀硬密封面流体动力学及接触应力分析
LNG(液化天然气)低温球阀(CBV)是LNG接收站中重要的流量控制装置。其可靠性直接影响管道系统的稳定性,特别是其阀座密封的损坏或泄漏将严重威胁LNG接收站的正常运行和安全。LNG流经CBV时,由于流体压力与阀门结构的相互作用,阀座处的硬密封不仅要承受碟形弹簧的预紧力,还要受到复杂流动流体压力的影响。因此,有必要对CBV内的流动特性以及LNG对其硬密封性能的影响进行研究。本文分析了影响CBV硬密封性能的流体力学和接触应力。分别分析了压降、压力和速度分布。采用流固耦合方法,分析了流体压力作用下CBV硬密封面上的接触应力。本工作对研究和掌握低温球阀的硬密封性能具有一定的参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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