某油气管道刺漏着火原因分析

Reason Analysis of Oil and Gas Pipeline Leakage and Ignition

针对某起油气集输钢管刺漏着火事故,通过化学成分检测、拉伸性能检测、硬度检测、金相检验、扫描电镜分析及能谱EDS分析和X射线衍射分析等试验,并结合运行工况环境调研,系统研究了该钢管刺漏以及着火的原因。结果表明:该钢管刺漏的主要原因是输送油气中含有的H_2S和O_2共同作用发生了点腐蚀,同时在CO_2、Cl^-等协同作用下进一步加快了腐蚀速率而最终导致刺漏,刺漏后腐蚀产物FeS自燃引发着火。

Leakage and ignition occurred in an oil and gas pipeline. Through chemical composition analysis, tensite tesl, hardness test, metal lographic examination, scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and X-ray diffractometer （XRD）, the reson for pipeline leakage and ignition was systematically investigated, combined with the operating environment research. Results showed that the main reason was the pitting corrosion of the pipeline due to hydrogen sulfide （ H2S） and oxygen （O2） during the transportation of oil and gas. Besides, the synergistic effects of carbon dioxide （ CO2 ） and chlorine （ CI- ） accelerated the eorrosive rates, which finally led to the leakage. After that, the corrosion products FeS spontaneously ignited.