基于变形焦炭塔的冷点处套合应力分析

Analysis of the nested stress at cold spot based on deformed coke drum

基于有限元软件,应用热-结构顺序耦合法,考虑变形焦炭塔两个变形较大区域(A区、B区)水冷阶段冷点处套合应力的作用。首先对变形区域建立了冷点周围附着焦炭的冷点模型,计算冷点处的套合应力;其次建立了未变形冷点套合模型将计算结果与变形模型对比,分析塔壁变形对冷点处套合应力的影响;最后建立了无焦模型,分析套合对冷点应力的影响。结果表明,冷点套合模型A区、B区最大等效应力较未变形模型分别提高6.02%和6.07%;无焦下,A区、B区最大等效应力相较未变形模型分别提高了8.53%和14.44%;对比同一变形下套合前后最大等效应力,未变形模型提高42.5%,A区提高39.5%,B区提高30.9%。

Based on finite element software, the nested stress effect at the cold spot during the cooling stage of two areas of the coke drum(A and B) with large deformation was considered by applying the thermal-structural sequential coupling method.Firstly, the cold spot model with coke attached around the cold spot is established for the deformation areas to calculate the nested stress at the cold spot;Secondly, the cold spot nesting model without deformation was established to compare the calculation results with the deformed model, and to analyze the effect of the deformation of tower wall on the nested stress at the cold spot;Finally, the cold spot model without coke attached was established to analyze the influence of nesting on the cold spot.The results show that the maximum equivalent stress in areas A and B of the cold spot nesting model is 6.02% and 6.07% higher than the undeformed model.Compared with the undeformed model without coke attached, the maximum equivalent stress in areas A and B is increased by 8.53% and 14.44%.Besides, the maximum equivalent stress of the undeformed model before and after nesting under the same deformation increases by 42.5%,that of area A increases by 39.5%,and that of area B increases by 30.9%.