Study On Fatigue Analysis Method Of Pressure Swing Adsorber

The traditional design method of the PSA device is based on the S-N curve,whereas the S-N curve of the material is measured by a smooth sample without cracks.In view of the PSA device is prone to defects in the process of manufacturing transportation, so the traditional methods cannot fully guarantee operation reliability and economy in the process of PSA, also cannot contain defects of equipment for safety assessment. The rapid development of fracture mechanics theory provides a scientific basis for the evaluation of pressure vessels with defects. In this paper, by using the commercial finite element analysis software, the PSA device of a model are analyzed and designed according to the traditional analysis method, and the fatigue life of the equipment with a crack is estimated. The main contents and conclusions of this paper are summarized as follows:It’s found that the calculated wall thickness values meets the equipment requirements by checking the strength and fatigue of the PSA device according to the JB-4732 (confirmed in 2005). The fatigue crack propagation test of the standard CT specimen was carried out using the material Q345R of the PSA device, found that the expansion of specimen in test under different frequency is basically the same. The fracture surface of the specimen was analyzed by micro morphology, and the conclusion was drawn that the fatigue fracture is ductile fracture.When the crack propagation is simulated by ABAQUS finite element method, the crack can be expanded in any direction without specifying the path. Regardless of the weld, use this method to simulate the location of the PSA device crack. By setting different crack depths in the model, the relationship between the stress intensity factor range and the crack depth is obtained. After getting the crack parameters, based on the Pairs formula to calculate the crack propagation from initial PSA device the critical length of the life cycle.