运行工况对X80天然气管道在役焊接温度场的影响  

Influence of operation condition on in-service welding temperature field of X80 natural gas pipeline

作　　者：朱汪友 ZHU Wangyou(PipeChina North Pipeline Company)

机构地区：[1]国家管网集团北方管道公司

出　　处：《油气储运》2022年第8期953-961,共9页Oil & Gas Storage and Transportation

基　　金：国家管网集团揭榜挂帅重点研究项目“油气管道维抢修关键技术研究”,AQWH202207。

摘　　要：为研究天然气输送工况参数对X80天然气输送管道在役焊接热影响区温度场的影响规律,以直径1422 mm、壁厚25.7 mm的X80天然气管道为研究对象,采用有限元方法对其在役焊接过程温度场进行数值模拟。结果表明:在役焊接时,热影响区温度由800℃降至500℃的过程(所需时间为t_(8/5))出现在焊接阶段的前20 s,深度范围为10 mm以内;天然气输送温度对管道温度场的影响最大,当输送温度低于10℃时,t_(8/5)随着输送温度下降而急剧减小,输送温度为-50℃时,t_(8/5)低至2.5 s;输送压力和流速对t_(8/5)影响较小,随着输送压力和流速的增加,t_(8/5)缓慢减小。当输送温度低于10℃、流速高于10 m/s、输送压力大于10 MPa时,热影响区和焊缝处产生冷裂纹的风险较大。研究成果可为现场施工单位调控X80管道在役焊接的输送工况和焊接工艺等参数提供理论依据,有助于保障X80管道在役焊接的安全。In order to study the influence law of natural gas transportation parameters on temperature field in the heat affected zone of in-service welding in X80 natural gas pipeline,the X80 natural gas pipeline with a diameter of 1422 mm and a wall thickness of 25.7 mm was studied and the temperature field during its in-service welding was numerically simulated with the finite element method.The results show that the process of temperature drop from 800℃to 500℃in the heat affected area(with the time required expressed as t_(8/5))appears within the depth of 10 mm in the first 20 s of in-service welding.Besides,the natural gas transportation temperature has the greatest impact on the temperature field of pipeline.When the transportation temperature is less than 10℃,t_(8/5) decreases sharply as the temperature drops,and it is as low as 2.5 s when the transportation temperature is-50℃.Further,the transportation pressure and flow rate of natural gas have little effect on t_(8/5),and t_(8/5) decreases slowly with the increasing of transportation pressure and flow rate of natural gas.When the transportation temperature is less than 10℃,the flow rate is greater than 10 m/s,and the pressure is higher than 10 MPa,the heat affected zone and the welds are at a high risk of cold cracks.The research results could provide a theoretical basis for the on-site construction organizations to control the parameters such as the transportation conditions and welding technology for in-service welding of X80 pipeline,which is helpful to ensure the safe operation of in-service welding of X80 pipeline.

关 键 词：在役焊接 X80钢 运行工况 温度场特征 有限元 

分 类 号：TG402[金属学及工艺—焊接]