Safety Assessment And Structural Optimization Of Hydrogen Absorber Based On Software ANSYS

Hydrogen absorber is one typical pressure vessel which is very important and usually seen in petroleum refining, chemical, metallurgical and other industries. Because of its harsh operating conditions of complex, high pressure and low pressure operate periodically alternating, the nature of the most adsorption medium is explosive, so hydrogen absorber belongs to fatigue pressure vessel with higher risks. However, the modern industry requires absorber with more security and reliability. Hydrogen absorber researched in this article comes from one hydrogen adsorption unit in victory petrochemical plant. It's put into use in 1998, has been in use for 13 years, and has been in extended service status. If we want to improve economic benefit and prevent security incidents, the hydrogen absorber needs accurate stress analysis of the structure, safety assessment and structural optimization, life prediction.This article bases on a large number of domestic and foreign literatures, uses the methods of elastic analysis and plastic analysis and uses finite element analysis software ANSYS to make the numerical simulation, stress analysis and safety assessment and life prediction. Through calculation and analysis, we found that the corner of hand hole forging, manhole wall opening reinforcement components, the reinforcing elements of export department and the intersection of lower head and skirt are dangerous. Among them, the corner of hand hole is the most dangerous and seriously restricts the fatigue life of absorber. Through calculation, we can know the life of absorber is about 17 years. In addition, this paper also analyzes the inner surface of the crack and the pressure test affects the absorber fatigue life. We use the Parametric Design Language APDL and Optimization Module OPT in software ANSYS to reestablish the analysis model, and optimization, find the best option which can lower the stress of the corner of hand hole forging and improve the lift of hydrogen absorber. We recalculate with the parameters of this program in old model and find this program meets the requirements of safety assessment of absorber, which also reduce the stress, and the life of hydrogen absorber is more than 30 years.