天然气集输管道90°弯头冲蚀磨损规律研究  

Study on Erosion of 90° Elbow of Natural Gas Gathering Pipelines

作　　者：宋晓琴[1] 刘玲 骆宋洋 罗鹏 王彦然 SONG Xiaoqin;LIU Ling;LUO Songyang;LUO Peng;WANG Yanran(School of Oil and Gas Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;Product Department,Chengdu Gas Group Co.Ltd.,Chengdu Sichuan 610041,China)

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]成都燃气集团股份有限公司生产部,四川成都610041

出　　处：《润滑与密封》2018年第8期62-68,共7页Lubrication Engineering

基　　金：国家自然科学基金面上项目(51474183)

摘　　要：针对输气管道中90°弯头冲蚀磨损失效的问题,依据现场实际工况,利用CFD仿真软件建立相应的模型,探究集输管道输送气固两相流介质时固体颗粒冲击弯头壁面的冲蚀磨损规律。采用RNG k-ε湍流模型、DPM模型和E/CRC冲蚀磨损模型研究集输压力、不同重力方向、集输流速、集输管径以及颗粒大小对弯头冲蚀磨损的影响。结果表明:集输压力越大,弯头冲蚀磨损程度减轻,且磨损区域呈现由中部向出口、由外侧向内侧凹曲面移动的现象;重力会影响弯头冲蚀磨损程度以及磨损区域,重力场和气相主流场趋势相同时会加剧磨损;当气流速度超过临界集输流速时,冲蚀磨损情况加剧且最大磨损率出现区域后移;集输管径越小、颗粒直径越大时,冲蚀磨损越严重。Aimed at the failure of 90° elbow in the natural gas gathering pipelines caused by erosion,the corresponding model was established by using CFD simulation software based on the actual working conditions,in order to investigate the erosion law of solid particles on the bend wall of natural gas gathering pipelines when delivering gas-solid two-phase flow medium.By using RNG k-ε turbulence model,DPM model and E/CRC erosion model,the effects of pressure,gravity direction,velocity,the diameter of the pipe and the solid particle size on the erosion of elbow were studied. The simulation results show that with the increasing of the pressure,the erosion wear of the elbow is reduced,and the wear area moves from the center to the exit and from the outside wall to the inside concave surface. Gravity has a influence on the degree of erosion and the wear area. Erosion will be increased when the gravity field coincides with the gas flow field. When the airflow velocity exceeds critical velocity,the erosion wear is aggravated,and the position of the maximum wear rate moves backward.The smaller the diameter of pipe and the greater the diameter of the solid particle,the more severe the erosion.

关 键 词：弯头 冲蚀磨损 固体颗粒 集输管道 

分 类 号：TH117.1[机械工程—机械设计及理论]