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基于已开发的顺次耦合的热应力耦合程序,运用有限元分析软件ABAQUS,对于已存在的结焦层和渗碳层的Cr35Ni45Nb合金乙烯裂解炉管,对其开车升温过程中温度场以及应力场的分布进行了数值分析。讨论了结焦层和渗碳层尺寸、不同升温方式对于炉管力学性能和传热性能的影响。结果表明:随着结焦层和渗碳层的厚度的增加,导致了炉管传热性能的加速下降。应力在结焦层、渗碳层和金属基体的界面处发生了突变的现象,其中产生的最大环向应力位于炉管的内壁,最小环向应力位于炉管的外壁,而且这种分布并不会随着炉管服役时间的增长而得到改变。
Based on the developed coupled thermal stress coupling procedure, the finite element analysis software ABAQUS was used to analyze the temperature field and stress field of Cr35Ni45Nb alloy ethylene pyrolysis furnace tubes with existing coking and carburizing layers Distribution of numerical analysis. The influence of the size of coke layer and carburized layer and different heating methods on the mechanical properties and heat transfer performance of the furnace tube was discussed. The results show that with the increase of the thickness of coke layer and carburized layer, the heat transfer performance of the tube decreases rapidly. There is a sudden change in stress at the interface between the coke layer, carburized layer and metal matrix, where the maximum circumferential stress is located on the inner wall of the furnace tube and the minimum circumferential stress is on the outer wall of the furnace tube, and this distribution does not With the furnace tube service time has changed.