含砂气流冲蚀下盲三通的减磨特性数值分析  

Numerical analysis of wear reduction characteristics of blind tee under sand-laden flow erosion

作　　者：李金宝 马川[1] 刘立君 李晓庆 LI Jinbao;MA Chuan;LIU Lijun;LI Xiaoqing(School of Civil Engineering,Northeast Petroleum University,Daqing,Heilongjiang,163318,China;School of Electronic Information Engineering,Changshu Institute of Technology,Suzhou,Jiangsu,215500,China)

机构地区：[1]东北石油大学土木建筑工程学院,黑龙江大庆163318 [2]常熟理工学院电子信息工程学院,江苏苏州215500

出　　处：《天然气与石油》2022年第6期101-107,共7页Natural Gas and Oil

基　　金：中国石油科技创新基金资助项目“稠油热采过程多孔介质内热质传递耦合作用机制研究”(2018D-5007-0211)。

摘　　要：为了分析含砂气流环境下传统90°弯管和盲三通内的流场分布,揭示冲蚀机理,并对比分析盲三通的抗冲蚀减磨能力,基于计算流体力学—颗粒离散(Computational Fluid Dynamics-Discrete Phase Model, CFD-DPM)方法,选用重整化群(Re-normalization group, RNG)k-ε湍流模型、挪威船级社(Det Norske Veritas, DNV)冲蚀预测模型以及颗粒—壁面碰撞反弹模型对相同操作参数的两管流场变化和壁面冲蚀速率进行数值计算。结果表明:90°弯管的严重冲蚀磨损区域主要分布在弯头外侧壁中心线附近,盲三通的严重冲蚀磨损区域分布在靠近盲段的竖直管段壁面和盲端圆壁上;盲三通在冲蚀过程中存在气流涡旋,阻碍了砂粒直接与壁面发生碰撞,减缓了对盲三通的冲蚀;随着流速、砂粒粒径和砂粒质量流量的增大,两管的最大冲蚀速率增大,盲三通的最大冲蚀速率增幅较小,因此盲三通比90°弯管的抗冲蚀减磨能力更好。研究结果可为集输站输气管汇的安全运行提供理论指导。In order to analyze the flow field distribution in the traditional 90° elbow and blind tee in the sand-laden flow environment, reveal the erosion mechanism, and compare and analyze the erosion resistance and wear reduction ability of the blind tee, this paper numerically simulate the flow field changes and wall erosion rates of the two pipe fittings with the same operating parameters, by using the RNG k-ε turbulence model, the DNV erosion prediction model and the particle-wall collision rebound model, based on the CFD-DPM method. The results show that: 1)The erosion area of the 90° elbow is mainly distributed near the center line of the outer side wall of the elbow, and the main erosion areas of the blind tee are distributed at the outer arch of the "joint" and the end of the blind plug;2)There is a flow vortex in the erosion path, which prevents the sand particles from directly colliding with the wall and slows down the erosion of the blind tee. With larger flow velocity, sand size, and mass flow rate of sand, the larger is the maximum erosion rate of both the 90° elbow and blind tee;but the blind tee exhibits more significant erosion resistance and wear reduction ability. The research results can provide theoretical guidance for safe operation of gas pipeline manifolds in gas gathering and transmission station.

关 键 词：气—固两相流 盲三通 90°弯管 冲蚀磨损 数值模拟 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]