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针对低含液率高压天然气节流过程易发生节流阀堵塞进而引发连锁关井问题,采用Fluent软件建立低含液率高压天然气节流过程的三维模型,分析液塞长度、持液率及液相黏度对节流阀压差和超压时间的影响。结果表明:液塞长度、持液率及液相黏度均对气液两相流场产生较大影响;在低含液率高压天然气节流过程中形成的液塞会极大地阻碍气相的运动,造成节流阀两端压差迅速升高,压差峰值随液塞长度和持液率的增加呈指数增加,随液相黏度的增加呈线性增加;超压时间随液塞长度和液相黏度的增加呈线性增加。
Aiming at the problem that the plug-in of the throttle valve is easy to occur and the problem of interlocking shut-in occurs for the throttling process of low liquid-containing high-pressure natural gas, Fluent software is used to establish the three-dimensional model of the throttling process of natural gas with low liquid content and high pressure. Effect of phase viscosity on throttle differential pressure and overpressure time. The results show that the length of the liquid slug, the liquid holdup and the viscosity of the liquid phase all have a great influence on the gas-liquid two-phase flow field. The liquid slugs formed during the throttling process of natural gas with low liquid content and high pressure will greatly impede the movement of the gas phase. Resulting in the rapid increase in the pressure drop across the throttle. The peak pressure difference increases exponentially with the increase of the length of the liquid slug and the liquid holdup, and increases linearly with the increase of the liquid viscosity. The overpressure time increases with the length of the liquid slug and the viscosity of liquid phase The increase is linearly increasing.