Brittle Fracture-Resisting Design And Safety Assessment Of Hydrogenation Reactor Based On Master Curve Approach

Hydrogcnation reactor is a key equipment in petrochemical industry and its safety is very important. After long-term service, the toughness of steel of hydrogenation reactor may decrease due to hydrogen embrittlcment and tempering brittleness. Thus, the brittle failure of hydrogenation reactor should be considered. At present, the proper toughness of charpy impact energy AKV, which is determined by engineering experience, mainly used to prevent the hydrogenation reactor from brittle fracture. But it is difficult to bulid the relationship between design load and material toughness by this method. In this study, the newly developed Master Curve approach was applied to the research of brittle fracture prevention design and safety of the hydrogenation reactor made of2.25Cr-lMo steel. The main contents and conclusion oi the thesis are as follows:(1) The reference temperature T0for2.25C’r-l Mo steel without and after step cooling was determined with the method of single and multiple temperatures. The applicability of Master Curve to petrochemical materials was validated.(2) Based on Master Curve approach, the safety assessment criteria of hydrogenation reactor at the final life expectancy is present by using T0parameter(3)Funclion of the corresponding relationship between temperature, pressure and fracture toughness was established quantificationally.Besides. the vessel pressure-temperature limit curve of the shutdown condition was determined, and pressure and temperature of the hydrostatic test was controlled. Quantitative prediction method was established to prevent brittle failure in hydrogenation reactor in order to avoid catastrophic accidents...