摘要
探索一种埋地燃气管道置换作业的减排方法,提出在管道置换作业前将管道抽真空的方法(称为抽真空置换方法),以减少天然气消耗、降低甲烷排放。分析了埋地管道在负压状态下载荷特征,模拟实际埋地管道工况,建立了X70、X52和Q235这3种钢级的不含缺陷管道和含缺陷管道在分别受到外载荷联合作用(管道内绝对压力为0)、外载荷单独作用(管道压力为0)时的12组有限元模型,通过计算12组有限元模型中管道的应力及变形率,验证了抽真空置换方法的可行性。研究表明:当管内全真空状态时,负压对管道应力及变形的影响较小,没有对管道造成安全威胁。从管道承压能力角度,抽真空置换方法是可行的。
A method of reducing emission for buried gas pipeline replacement operation is explored,and a method of vacuumizing the pipeline before pipeline replacement operation(called the vacuum extraction replacement method)is proposed to reduce natural gas consumption and methane emission.The load characteristics of buried pipelines under negative pressure are analyzed.By simulating the actual working conditions of buried pipelines,12 groups of finite element models of X70,X52 and Q235 steel grades of pipelines without defects and pipelines with defects under the combined action of external load(the absolute pressure in the pipeline is 0)and external load alone(the pipeline pressure is 0)are established.The feasibility of the vacuum extraction replacement method is verified by calculating the stress and deformation rate of the pipeline in 12 groups of finite element models.The research shows that when the inside of pipeline is in full vacuum,the negative pressure has little effect on the stress and deformation of the pipeline,and does not pose a safety threat to the pipeline.From the perspective of pipeline pressure bearing capacity,the vacuum extraction replacement method is feasible.
作者
马彬
马旭卿
邸鑫
MA Bin;MA Xuqing;DI Xin
出处
《煤气与热力》
2022年第8期V0032-V0035,共4页
Gas & Heat
关键词
燃气管道置换
甲烷减排
抽真空
承压能力
负压
gas pipeline replacement
methane emission reduction
vacuum extraction
pressure bearing capacity
negative pressure
