起伏天然气管道干空气法干燥时间预测模型  

Drying time prediction model of undulating natural gas pipeline with dry air

作　　者：卫续 吕晓阳 田鑫地 李自力[3] WEI Xu;LYU Xiaoyang;TIAN Xindi;LI Zili(PipeChina Oil&Gas Control center;PetroChina Guangdong Petrochemical Company;College of Pipeline and Civil Engineering,China University of Petroleum(East China))

机构地区：[1]国家管网集团油气调控中心 [2]中国石油广东石化公司 [3]中国石油大学(华东)储运与建筑工程学院

出　　处：《油气储运》2022年第8期972-979,共8页Oil & Gas Storage and Transportation

基　　金：山东省自然科学基金面上项目“X80钢焊接热影响区断裂失效机制及剩余寿命预测方法研究”,ZR2020ME094。

摘　　要：准确预测起伏管道干燥时间可保障管道低洼处残余水干燥彻底,避免投产后天然气含水量超标。通过建立起伏天然气管道干空气法干燥时间预测模型,引入低洼处积液量与表面积的几何关系模型,对低洼处积液量及表面积随干燥时间的变化规律进行准确描述,并通过室内实验分别验证了连续吹扫过程及封堵过程的准确性。选取某标段现场大口径起伏天然气管道进行干燥模拟,结果表明:起伏管道干燥时干空气露点不宜低于-40℃,流速不宜高于6 m/s,均匀水膜从前向后逐渐被干燥,管道后端低洼处残余水最后被干燥。研究成果提高了起伏天然气管道干燥时间的预测精度,可对起伏天然气管道干燥方案设计及干燥施工过程提供指导。Accurate prediction of the drying time of undulating pipeline can ensure the complete drying of residual water in the low-lying sections of pipeline and prevent the water content of natural gas from exceeding the specified standard after the pipeline is put into operation.Herein,a drying time prediction model of undulating natural gas pipeline with dry air was established.Meanwhile,the geometric relationship model between the amount of liquid accumulated at the low-lying areas and the surface area was introduced,which could accurately describe the changes of residual water and surface area at low-lying areas with drying time.Besides,the accuracy of the continuous purging and plugging process was verified by laboratory experiments respectively.Moreover,the drying process was simulated with a large-diameter undulating natural gas pipeline on the site of a bid project.The results show that the dew point of the dry air should not be lower than-40℃and the flow velocity should not be higher than 6 m/s when drying the undulating pipeline.The uniform water film is dried from front to back,and the residual water at the low-lying sections of the back end of pipeline is dried last.The relevant research which improves the prediction accuracy of the drying time of the undulating natural gas pipeline,could provide guidance for the design of drying scheme and the drying process of the undulating natural gas pipeline.(8 Figures,2 Tables,36 References)

关 键 词：起伏天然气管道 低洼处存水 干空气干燥 时间预测 

分 类 号：TE973[石油与天然气工程—石油机械设备]