含蜡天然气孔板式节流阀内蜡沉积特性数值模拟

蜡沉积是含蜡天然气在集输和处理过程中常见的一种问题，会危害到天然气管输系统的高效、安全运行。为分析含蜡天然气在孔板式节流阀内的蜡沉积问题，基于离散相模型，通过自定义函数，建立蜡沉积数值模拟模型，分析传统孔板式节流阀的蜡沉积规律。研究结果表明：节流阀内蜡沉积主要受湍动能与涡流的影响，沉积位置主要出现在喉道出口处以及距喉道出口0.17 m左右的管壁处；管道内颗粒最大沉积量随压力的增加而增加，距喉道出口0.17 m左右的沉积宽度约为0.01 m,当压力增加1 MPa,该处沉积位置向管道出口处移动约0.005 m。其中，管道内最大沉积量与节流孔径呈负相关，与颗粒直径、喉道长度呈正相关。

Numerical simulation of wax deposition in an orifice throttle valve pertinent to waxy natural gas

Wax deposition is a common problem in the process of gathering, transportation and processing of waxy natural gas, which will endanger the efficient and safe operation of natural gas pipeline system. In order to analyze the wax deposition problem of waxy natural gas in orifice throttle valve, based on discrete phase model and UDF user-defined function, a wax deposition numerical simulation model was established to analyze the wax deposition rule of traditional orifice plate throttle valve. The results show that the wax deposition in the throttle valve is mainly affected by turbulent kinetic energy and eddy current, and the deposition position mainly occurs at the throat outlet and the pipe wall about 0.17 m away from the throat outlet; The maximum deposition amount of particles in the pipeline increases with the increase of pressure. The deposition width about 0.17 m away from the throat outlet is about 0.01 m. When the pressure increases 1MPa, the deposition position moves about 0.005 m towards the pipeline outlet. The maximum deposition in the pipeline is negatively related to the orifice diameter, and positively related to the particle diameter and throat length.