临界CO_(2)传输中水合物对弯管冲蚀规律分析

Analysis of Erosion Rule of Bent Pipe by Hydrate in Supercritical CO_(2) Transport

管道输送超临界CO_(2)过程中,受含汽量条件影响而形成的CO_(2)固体水合物颗粒会对管壁造成冲蚀。研究水合物颗粒在不同条件下对弯管管壁的冲蚀规律对CO_(2)的安全输送有重要意义。利用COMSOL Multiphysics软件分析超临界CO_(2)输送管道的弯管段的固液两相流的流场规律,研究不同流速、不同粒径、不同弯曲角度下固体水合物对管壁的冲蚀规律。结果表明,流动速度和粒子粒径的增加会使固体水合物对管壁的冲蚀更严重,使冲蚀区域的分布位置往弯管外侧管壁集中;弯管角度发生变化时,碰撞时粒子的入射方向与壁面的夹角发生改变,造成了冲蚀区域和程度的不同,直角弯管更易受到水合物粒子的冲蚀破坏。

In the process of supercritical CO_(2)transportation in pipelines,the CO_(2)solid hydrate particles formed under the influence of the vapor content condition will erode the pipe wall.It is of great significance to study the eroding rule of the particles on the elbow pipe wall under different conditions for the safe transportation of CO_(2).The COMSOL Multiphysics software was used to calculate the flow conditions of the solid-liquid two-phase flow in the elbow section of the supercritical CO_(2)transportation pipeline,and the erosion law of solid hydrate on the pipe wall under different flow rates,different particle sizes,and different bending angles were analyzed.The results show that the increase in flow velocity and particle size will strengthen the erosion of solid hydrates on the pipe wall,causing the erosion area to concentrate on the outer pipe wall of the elbow.When the angle of the elbow changes,it mainly affects the angle between the incident direction and the wall surface when the particles collide,resulting in different erosion areas and degrees.The right-angle elbow is more susceptible to erosion damage by hydrate particles.