Performance Research On The Impact Of Stressed-skin Effect On The Carrying Capacity Of Cold Box

As the shell of air separation plant, cold box can play a role of cooling in fractionatorin which filled with pearlite sands. Bearing capacity of panel was not considered in theconventional design only as enclosure structure. The in-plane shearing strength of panel islarge. The whole stiffness of structures would be increased greatly if the panel can beconnected with surrounding frame reliably and bear loads which are transferred fromstructures. This would help to saving amount of steels and better economic benefits areobtained.Stressed-skin effect refers to considering the role of panel which is set outside coldbox in horizontal load.The steel plate is also stressed-skin diaphragm Based on thedomestic and foreign research achievements about skin technology, finite elementsimulations are carried out based on ANSYS for analyzing the bearing capacity. Theconclusions are drawn that the capacity of cold box using skin technology has increasedgreatly compared to cold box using traditional technology. The effects of depth-thicknessratio and aspect ratio of stressed-skin diaphragm, axial compression ratio and stiffnesscoefficient of frame columns and welding rate between stressed-skin diaphragm and thesurrounding frame on bearing capacity of cold box are analyzed.The results of the finite element analysis are as follow: the smaller depth-thicknessratio is, the more obvious capacity of cold box increases; aspect ratio is the major factor inbearing capacity of cold box and the smaller aspect ratio is, the higher capacity and lateralstiffness is; The smaller axial compression ratio and the bigger stiffness coefficient offrame columns is, the higher the capacity of cold box, but the impact on the initial elasticstiffness of cold box are relatively small; After the welding rate of stressed-skin diaphragmand the surrounding frame exceeds a certain value, stress field of the skin plate developsfully relying on frame columns and the effects on the bearing capacity of the cold box areno longer clear. Based on the summary of analysis results, a design method of cold boxconsidering the stressed-skin effect is proposed combining with the relevant design rulesand the research achievements at home and abroad.