Optimal slot dimension for skirt support structure of coke drums

作     者：Edward WANG Zihui XIA 

作者机构：Department of Mechanical Engineering University of Alberta Edmonton T6G1H9 Canada 

出 版 物：《Frontiers of Mechanical Engineering》 (机械工程前沿（英文版）)

年 卷 期：2018年第13卷第4期

页      面：554-562页

核心收录：

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 13[艺术学] 080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Collaborative Research and Development (CRD) Grant of the National Science and Engineering Research Council (NSERC) of Canada 

主　　题：coke drum stress analysis cyclic stress fatigue life skirt slots 

摘      要：The skirt-to-shell junction weld on coke drums is susceptible to fatigue failure due to severe thermal cyclic stresses. One method to decrease junction stress is to add slots near the top of the skirt, thereby reducing the local stiffness close to the weld. The most common skirt slot design is thin relative to its circumferential spacing. A new slot design, which is significantly wider, is proposed. In this study, thermal-mechanical elastoplastic 3-D finite element models of coke drums are created to analyze the effect of different skirt designs on the stress/strain field near the shell-to-skirt junction weld, as well as any other critical stress locations in the overall skirt design. The results confirm that the inclusion of the conventional slot design effectively reduces stress in the junction weld. However, it has also been found that the critical stress location migrates from the shell-to-skirt junction weld to the slot ends. A method is used to estimate the fatigue life near the critical areas of each skirt slot design. It is found that wider skirt slots provide a significant improvement on fatigue life in the weld and slot area.