大口径长输天然气管道掺氢混气特性研究  

Study on the Characteristics of Hydrogen-Mixed Gas in Large-Diameter Long-Distance Natural Gas Pipeline

作　　者：杨云兰 张鑫 刘玉辉[1] 熊至宜[1] 刘涛 冯艳丽 YANG Yunlan;ZHANG Xin;LIU Yuhui;XIONG Zhiyi;LIU Tao;FENG Yanli(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing 102249,China;China National Petroleum Pipeline Machinery Manufacturing Co.,Ltd.,Langfang Hebei 065000,China;National Pipe Network Group Branch of the General Institute of Science and Technology,Tianjin 300457,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249 [2]中油管道机械制造有限责任公司,河北廊坊065000 [3]国家管网集团科学技术研究总院分公司,天津300457

出　　处：《石油化工高等学校学报》2024年第5期11-19,共9页Journal of Petrochemical Universities

基　　金：国家自然科学基金项目(52174040)。

摘　　要：长输天然气管道具有管径大、流速快的特点,掺氢混气的不均匀度会增加管道输送系统金属氢脆、密封渗漏、设备运行不稳定等风险。针对我国某长输天然气管道的运行工况,采用数值模拟的方法研究了4种静态混合器(SK型、SX型、SL型、HEV型)进行掺氢输送(掺氢比为3%)时的流场特性以及混合效果。结果表明,4种静态混合器对天然气掺氢混气均具有扰动混合作用,混合不均匀度随输量的增大而减小,压力损失随输量的增大而增大;在掺氢比为3%、掺氢压力为4.22 MPa、输量为13×10^(8)~36×10^(8)Nm^(3)/a的工况下,SK型、SX型、SL型和HEV型静态混合器的混合特性和效果差异较大,应在不同的混合距离处,将混合不均匀度下降至5%以下。综合考虑,可优选或创新设计结构相对简单、混合距离短、混合不均匀度较低、湍流特性优异、剪切特性良好并且压降适中的静态混合器,作为大口径长输天然气主管路掺氢混合器。The long-distance natural gas pipeline is characterized by large diameter and fast flow,and the uneven mixing of hydrogen gas will increase the risks of metal hydrogen embrittlement,seal leakage and unstable operation of equipment in the pipeline transportation system.According to the operating conditions of a long-distance natural gas pipeline in China,numerical simulation was used to study the flow field characteristics and mixing effect of four types of static mixers(SK,SX,SL,HEV)when hydrogen doping is transported(the ratio of hydrogen doping is 3%).The results show that all four types of static mixers have disturbing mixing effects on natural gas with hydrogen addition,and the value of the mixed non-uniformity COV decreases with the increase of flow rate,while the pressure loss increases with the increase of flow rate.The mixing characteristics and effects of SK,SX,SL and HEV type mixers vary significantly under the operating conditions of 3%hydrogen doping ratio,4.22 MPa hydrogen doping pressure,and flow rates ranging from 13×10^(8)Nm^(3)/a to 36×10^(8)Nm^(3)/a.The COV value should be reduced to less than 5%at different mixing distances.It can be optimally or innovatively designed with a relatively simple structure,short mixing distance,low non-uniformity,excellent turbulence characteristics,good shear characteristics,and moderate pressure drop as a large-caliber long-distance natural gas main pipeline hydrogen mixer.

关 键 词：天然气掺氢 静态混合器 数值模拟 流场分析 混气特性 

分 类 号：TE832[石油与天然气工程—油气储运工程]