过渡圆弧结构在火管锅炉中的应用

针对火管锅炉管板与壳体连接结构的设计过程中,常常依据设计者的经验设计而无法进行精确的结构优化。文章对给定的3种不同过渡圆弧半径的火管锅炉结构采用有限元分析方法进行热应力分析,得到连接管板与壳体的过渡圆弧应力集中部位,通过对比3种过渡圆弧半径的应力分布和位移状况,建议优化设计圆弧时R取值不宜过大,与此同时也要保证最大应力区的应力在许用的范围内，这对类似结构下的优化设计提供了有力的依据。

Application and Research of Transition Arc Structure in Fire Tube Boiler

For design of connection structure between tube plate and housing in fire tube boiler, precise structure optimization always cannot be obtained due to empirical design from designers. The fire tube boiler structures with three different transition radius were analyzed through ANSYS, the stress concentration of transition arc which connecting tube plate and housing was obtained. The stress distribution and displacement conditions of three transition radius were contrasted, and it was given that R should not be too large for arc optimized design, to ensure the stress in maximum stress areas is still within permitted scope while solving the problem of transition arc expansion. It provides a strong basis for optimal design of such structures.