制氢转化炉管裂纹产生原因分析及在线措施

Cause Analysis and Online Processing on Penetrating Crack of Reforming Furnace Tube for Hydrogen Production

大庆石化公司化肥厂合成氨装置制氢转化炉采用凯洛格工艺,2008年新更换炉管外伸段材质均采用ASME标准中的A312-TP304H牌号奥氏体不锈钢,在运行2a后外伸段母材出现泄漏。国内多套装置的同类型炉管外伸段材质为A312-TP304H或接近的A312-TP321H系列牌号,投用2a左右陆续在炉管外伸段母材上发现穿透性裂纹,裂纹产生位置高度相似。通过对炉管进行失效分析,查找裂纹产生原因,提出在线延缓裂纹发展趋势的保温措施。通过检修期中的检测分析验证了上述失效分析的合理性,通过几个运行周期的连续监测,确认了在线措施的可行性。

The reforming furnace for hydrogen production of Chemical Fertilizer Plant of Daqing Petrochemical Company used Kellogg process,all the materials used for extended section of reforming furnace tube that changed in 2008 are A312-TP304 Haustenitic stainless steel in ASME standard.After 2years of operation,penetrating crack occurred in the extended section's base metal of the reforming furnace tube.In many plants,the materials used for extended section of reforming furnace tube are A312-TP304 Hor A312-TP321 H which have similar component.After about 2years of operation,penetrating crack occurred in the extended section's base metal of the reforming furnace tube.The penetrating crack in different plants had highly similar position.Through the failure analysis of the furnace tube,find the cause of crack,the online processing for the development trend of the crack growth are put forward.Through the inspection of the maintenance period,the rationality of the analysis is verified,and through the continuous monitoring of several operating cycles,the feasibility of online processing has been confirmed.