Establishment Of Minimum Pressurization Temperature For Hydrogenation Reactors Made By2.25Cr-1Mo-0.25V Steel

2.25Cr-1Mo-0.25V steel was widely used in the manufacture of hydrogenation reactors in order to meet the requirement of reactor condition which is to higher temperature and higher hydrogen pressures working condition. It is very important to establish minimum pressurization temperature, in order to ensure the safety of the reactors.In this paper, a procedure to establish the minimum pressurization temperature for reactor vessels made by2.25Cr-1Mo-0.25V steel was developed. It is proved that2.25Cr-1Mo-0.25V steel is less sensitive to temper embrittlement than traditional2.25Cr-1Mo steel by the analysis of temper embrittlement. It is advisable to use a lower temperature for full pressure, which is more economic. The hydrogen diffusion coefficient of2.25Cr-1Mo-0.25V steel was determined by test. A reasonable threshold value of hydrogen concentration was determined. Finite Element Method was used to determine the hydrogen levels after reactors cool down during witch some of the hydrogen diffuses out. The establishment of minimum pressurization temperature accommodated the potential of temper embrittlement and hydrogen embrittlement. Finally, the procedure was applied in an engineering case. Hydrogenation reaction made of2.25Cr-1Mo-0.25V steel can achieve more economic benefit.