【摘要】 "川气东送"管道全长约2 200km,沿线地形地貌复杂,多处形成大落差起伏,最大坡度达60°,给管道清管作业带来一定的困难和风险。为此,针对大落差管段建立了清管动力学有限元模型,在给定清管器进入管道时的初始运行速度、管道内压等作业参数的条件下,采用ABAQUS有限元分析软件分析了橡胶清管球在大落差管段清管时的运行规律以及清管器通过时管道的振动情况,研究了清管器冲击时的管道应力变化与清管器速度及管道内压的变化关系,评估了大落差管段清管时的安全性。结果表明:①橡胶清管器清管作业时,管道内部的输送压力对大落差管段的冲击载荷影响明显,管道最大应力会随着管道内压的增大而增大;②清管器的速度对冲击应力的影响不大,基本呈增长趋势,变化范围在7MPa之内;③清管器通过时管道发生明显振动,通过后管道恢复原状;④为保证清管器顺利通过大落差管段,增大了清管器两端压差,此时清管器速度表现为增长趋势。更多还原

【Abstract】 The Sichuan-to-East China gas pipeline is about 2200 km long in total,along which the landform is complex and in many areas with huge downthrow,much undulate topography and a maximum gradient of 60°.This brings about a certain difficulty and risk in pigging operation in pipelines.In view of this,a dynamic model based on the finite element method was established for pigging operation in such hilly pipelines.Under the given condition of such parameters as the initial running speed,the internal pressure of pipes,etc.when a pig enters into the pipelines,the ABAQUS was adopted to analyze the motion law of the rubber cleaning pig in the hilly pipelines and the vibration of pipes at the time when the pig goes through.On this basis,the pig’s dropping impact was discussed on the pipe’s pressure as well as its correlation to the pig’s running speed and the pipe’s internal pressure.Additionally,the pigging operation safety was evaluated in hilly pipelines.The following conclusions were thus drawn.a.During the pigging operation,the pipe’s transmission pressure has an obvious effect on the dropping impact in the hilly pipelines and the maximum pipe pressure will increase with the increase of internal pressure in pipes.b.The rubber pig’s running speed has little effect on the dropping impact and keeps rising within the range of less than 7 MPa.c.The pipes vibrate prominently when the pig goes through and after that they soon return to the status quo.d.The pressure difference between the pig’s two ends should be increased to ensure the pig’s smooth going through the hilly pipelines,by the time of which the pig’s running speed is in rising tendency.更多还原