加氢反应器裙座支撑结构的有限元分析

Finite element analysis of skirt support structure of hydrogenation reactor

加氢反应器裙座支撑结构部位的机械应力和温差应力均较大,应力状况较为恶劣。对加氢反应器裙座支撑局部结构进行了温度场分析,采用间接分析法将所得温度场施加到结构上进行热应力分析。根据不同温度点的单向拉伸试验得到材料在各温度点下的应力-应变曲线,采用线弹性和弹塑性两种材料本构分别对加氢反应器裙座支撑结构进行有限元计算。将计算结果进行对比分析,表明弹塑性有限元计算结果更加精确。此外,根据ASMEⅧ-2 2007关于两种方法的失效评定内容对该结构局部失效的可能性进行了评定计算。对比研究表明,基于线弹性有限元计算结果虽可用于工程设计,但其最大应力部位与实际情况并不一致,因此分析设计计算方法仍有改进的空间。(图6,表1,参10)

The skirt support structure of the hydrogenation reactor has big mechanical stress and thermal stress, and poor stress state. This paper analyzes the temperature field of the skirt support structure of the hydrogenation reactor and the thermal stress through indirect analysis method of adding the temperature field to the structure. Based on the one directional tensile test of different temperature points, the Stress-strain curve of material under different temperature points is obtained, and materials constitutive of linear elastic and elastic-plastic are used to carry out the finite element calculation of the skirt support structure of the hydrogenation reactor. Comparison and analysis of the results show that the calculation result of elastic-plastic finite element is more accurate. Besides, based on the failure evaluation content of these two methods in ASME V^-2 2007, this paper evaluates and calculates the possibility of local failure in this structure. The research in this paper indicates that the calculation results based on linear elastic finite element can be used in the engineering design, but the most stress position may not be the same position in the actual situation, which means that there is still margin for the improvement of the analysis and design calculation method. （6 Figures, 1 Table, 10 References）