塔轮天然气管道沉积物形成原因及应对措施

Formation causes and countermeasures of sediments in the Talun gas pipeline

针对塔轮天然气管道内出现大量沉积物,导致管道阻塞严重的问题,利用X射线衍射、X射线荧光光谱、扫描电子显微镜、气相色谱、离子色谱等手段对现场的沉积物、水样、气样进行表征。结果表明:沉积物的主要组成为FeCO3、Fe3S4、FeO(OH)及S,综合分析当地气候条件及集输气体的变化情况,确定沉积物主要是由CO2腐蚀、H2S腐蚀生成的腐蚀产物与析出S、粉尘的堆积形成的混合物,并据此分析了沉积物中各主要物质的形成原因与沉积机理。实验结果表明:集输气体中H2S含量波动过大、水露点过低是造成沉积物形成的主要原因,进而提出了延缓管道内沉积物形成的具体应对措施。

A large number of sediments have appeared in the Talun gas pipeline,which leads to serious obstruction in the pipeline.The sediments,water samples and gas samples on site were characterized by means of X-ray diffraction(XRD),X-ray fluorescence spectrum(XRF),scanning electron microscope(SEM),gas chromatograph(GC)and ion chromatograph(IC).It is determined that the sediments are mainly composed of FeCO3,Fe3S4,FeO(OH)and S.Then,the local climatic conditions and the changes of gathered gas were analyzed comprehensively.It is shown that the sediments are mainly a mixture of the corrosion products of CO2 and H2S and the accumulation of precipitated S and dust.And accordingly,the formation causes and mechanisms of the main substances in the sediments were analyzed.It is indicated that the excessive fluctuation of H2S content and the low dew point of the gathered gas are the main formation causes of the sediments.Based on this,several specific countermeasures were proposed to delay the formation of sediments in pipelines.