多因素耦合下燃气管道非定型弯管冲蚀模拟  

Simulation of non-fixed bend erosion in gas pipelines under multi-factor coupling

作　　者：郭凯[1] 严哲楸 凌晓[1] GUO Kai;YAN Zheqiu;LING Xiao(School of Petroleum and Chemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu Province,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《化学工程》2025年第4期59-64,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(52204074);甘肃省科技专员专项(23CXGA0053);甘肃省教育厅青年博士基金(2024QB-026);兰州理工大学红柳优青人才计划(02/062310)。

摘　　要：特殊角度弯管在实际燃气管道工程中使用广泛,由于非定型弯管角度特殊,流体流经弯头造成的流速和压力突变使其更易发生冲蚀,甚至致其失效。基于气固两相耦合、DPM(离散相)和冲蚀模型,采用CFD模拟,建立有限元体积数学模型,对兰州市某燃气管线中的106.4°非定型弯管进行冲刷腐蚀模拟,分析实际工况下及耦合不同流速、含水率、颗粒直径等因素时弯管的冲刷腐蚀特性。结果表明:实际工况下颗粒冲蚀集中在外侧壁面,分布面积沿曲面对称,呈“甲虫”状。在耦合流速和质量流率、含水率和流速、粒径和密度、温度和颗粒密度4种情况下,前3种因素与冲蚀速率间均呈“互同”耦合关系,后者呈“互逆”关系。研究发现在流率为0.1 kg/s下,流速增大,冲蚀面积右移,含水率0.008%—0.01%对非定型弯管冲蚀速率影响最大。Special angle bend pipes are widely used in practical gas pipeline engineering.Due to the special angle of non-fixed bend pipes,the sudden changes in flow velocity and pressure caused by fluid passing through the bend pipes make them more prone to erosion and even failure.Based on gas-solid two-phase coupling,DPM and erosion model,CFD simulation was used to establish a finite element volume mathematical model to simulate the erosion and corrosion of a 106.4°amorphous bend pipe in a gas pipeline in Lanzhou.The erosion and corrosion characteristics of the bend pipe under actual working conditions and coupled with different factors such as flow velocity,moisture content and particle diameter were analyzed.The results show that under actual working conditions,particle erosion is concentrated on the outer wall surface,with a symmetrical distribution area along the curved surface,forming a“beetle”shape.In the four cases of coupling flow rate and mass flow rate,moisture content and flow rate,particle size and density,temperature and particle density,the first three factors are linearly identity correlated with erosion rate,while the latter is reciprocal correlated.It is found that at a flow rate of 0.1 kg/s,as the flow rate increases,the erosion area shifts to the right,and the moisture content of 0.008%-0.01%has the greatest impact on the erosion rate of amorphous bent pipes.

关 键 词：燃气管道 非定型弯管 耦合多因素 冲蚀 模拟 

分 类 号：TE832[石油与天然气工程—油气储运工程]