天然气集输系统典型管件流场及固体颗粒沉积规律研究
发布时间：2018-09-13 14:52
【摘要】：高含硫天然气在集输过程中会在集输系统内部出现固体颗粒沉积的现象,固体颗粒沉积会导致集输系统的集输能力下降,甚至停产。故研究集输系统中,天然气经过一些典型管件如计量分离器、节流孔板(阀门)、管汇和三通等时,气体与固体的流动情况以及固体颗粒直径变化以及分布情况,对于预测颗粒沉积、提高天然气集输系统安全水平,保障天然气集输系统稳定运行,具有重要的工程指导意义。本文利用CFD技术对天然气集输系统中的直管段、计量分离器以及节流孔板内部的气固两相湍流流动进行了三维的数值模拟。通过对不同湍流模型、气固两相流模型以及群体平衡模型的学习,最终选用标准k-ε模型模拟管件内的湍流流动,利用Euler模型模拟管件内的气固两相流动,选择Lou模型作为颗粒间的聚并模型以及Ghadiri模型作为颗粒间的破碎模型。通过模拟得到如下结论:圆形管道中心处固体颗粒直径最小,在靠近管道壁面附近颗粒直径最大,随着流动距离和进口颗粒浓度的增加,出口处颗粒的直径呈增大趋势,管道的布置方式对固体颗粒的直径变化也有很大的影响;计量分离器内部存在着不同大小的低速区和漩涡区,天然气在主流方向上流动稳定,在垂直于主流方向上存在着较强的二次流,同时内部固体颗粒的直径基本上在10μm以下,整体上固体颗粒的聚并作用较弱,故以重力沉降为主;天然气流过节流孔板后形成尖峰状的低温区,此低温区随着节流压降和孔板直径比的增大呈扩大的趋势,且最低温度存在于管道的中心轴线上,工质温度沿径向到管内壁附近逐渐升高;流体经过节流孔板之后,内部固体颗粒的直径迅速增大,其分布特点是:孔板下游的中轴线附近形成小直径颗粒的尖峰,在尖峰的两侧,形成一个颗粒直径较大的区域,天然气沿着管道继续流动,最终达到稳定的颗粒直径分布状态,且颗粒直径随着孔板节流压降和进口颗粒浓度的增加以及孔板直径比的减小呈增大趋势。
[Abstract]:In the process of gathering and transporting high sulfur natural gas, solid particle deposition will occur in the gathering and transportation system, and the solid particle deposition will lead to the decrease of gathering and transportation capacity of the gathering and transportation system, and even the shutdown of production. Therefore, when natural gas passes through some typical pipe fittings such as metering separator, throttle plate (valve), manifold and three-way connection, the flow of gas and solid and the change and distribution of solid particle diameter are studied in the gathering and transportation system. It is of great significance to predict grain deposition, improve the safety level of natural gas gathering and transportation system, and ensure the stable operation of natural gas gathering and transportation system. In this paper, the three-dimensional numerical simulation of gas-solid two-phase turbulent flow in the straight pipe section, metering separator and orifice plate of natural gas gathering and transportation system is carried out by using CFD technology. Through the study of different turbulence models, gas-solid two-phase flow models and mass equilibrium models, the standard k- 蔚 model is used to simulate the turbulent flow in the tube fittings, and the Euler model is used to simulate the gas-solid two-phase flow in the tube fittings. Lou model is chosen as aggregation model and Ghadiri model as breakage model. The results show that the diameter of solid particles is the smallest at the center of circular pipeline and the largest near the wall of pipe. With the increase of flow distance and concentration of inlet particles, the diameter of particles at outlet increases. The arrangement of pipeline also has a great influence on the change of the diameter of solid particles. There are low speed regions and whirlpool regions in the metering separator, and the flow of natural gas is stable in the mainstream direction. There is a strong secondary flow in the direction perpendicular to the mainstream, and the diameter of the solid particles is basically less than 10 渭 m. The natural gas flows through the orifice plate to form a peak-like low temperature zone, which tends to expand with the increase of the throttling pressure drop and the diameter ratio of the orifice plate, and the lowest temperature exists on the central axis of the pipeline. The temperature of the working fluid increases gradually along the radial direction to the inner wall of the tube, and the diameter of the solid particles increases rapidly after the fluid passes through the orifice plate. The distribution characteristic is that the peak of the small diameter particles is formed near the central axis of the downstream of the orifice plate. On both sides of the peak, a region with a larger particle diameter is formed, and the natural gas continues to flow along the pipeline, finally reaching a stable particle diameter distribution state. The particle diameter increases with the increase of orifice pressure drop, inlet particle concentration and the decrease of orifice diameter ratio.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE863
本文编号：2241492
[Abstract]:In the process of gathering and transporting high sulfur natural gas, solid particle deposition will occur in the gathering and transportation system, and the solid particle deposition will lead to the decrease of gathering and transportation capacity of the gathering and transportation system, and even the shutdown of production. Therefore, when natural gas passes through some typical pipe fittings such as metering separator, throttle plate (valve), manifold and three-way connection, the flow of gas and solid and the change and distribution of solid particle diameter are studied in the gathering and transportation system. It is of great significance to predict grain deposition, improve the safety level of natural gas gathering and transportation system, and ensure the stable operation of natural gas gathering and transportation system. In this paper, the three-dimensional numerical simulation of gas-solid two-phase turbulent flow in the straight pipe section, metering separator and orifice plate of natural gas gathering and transportation system is carried out by using CFD technology. Through the study of different turbulence models, gas-solid two-phase flow models and mass equilibrium models, the standard k- 蔚 model is used to simulate the turbulent flow in the tube fittings, and the Euler model is used to simulate the gas-solid two-phase flow in the tube fittings. Lou model is chosen as aggregation model and Ghadiri model as breakage model. The results show that the diameter of solid particles is the smallest at the center of circular pipeline and the largest near the wall of pipe. With the increase of flow distance and concentration of inlet particles, the diameter of particles at outlet increases. The arrangement of pipeline also has a great influence on the change of the diameter of solid particles. There are low speed regions and whirlpool regions in the metering separator, and the flow of natural gas is stable in the mainstream direction. There is a strong secondary flow in the direction perpendicular to the mainstream, and the diameter of the solid particles is basically less than 10 渭 m. The natural gas flows through the orifice plate to form a peak-like low temperature zone, which tends to expand with the increase of the throttling pressure drop and the diameter ratio of the orifice plate, and the lowest temperature exists on the central axis of the pipeline. The temperature of the working fluid increases gradually along the radial direction to the inner wall of the tube, and the diameter of the solid particles increases rapidly after the fluid passes through the orifice plate. The distribution characteristic is that the peak of the small diameter particles is formed near the central axis of the downstream of the orifice plate. On both sides of the peak, a region with a larger particle diameter is formed, and the natural gas continues to flow along the pipeline, finally reaching a stable particle diameter distribution state. The particle diameter increases with the increase of orifice pressure drop, inlet particle concentration and the decrease of orifice diameter ratio.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE863
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