• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (6): 73-78.doi: 10.3901/JME.2015.06.073

• 压力容器专栏 • 上一篇    下一篇


高炳军 郭丽丽 董俊华   

  1. 河北工业大学化工学院 天津 300130
  • 出版日期:2015-03-20 发布日期:2015-03-20
  • 基金资助:

Cyclic Plasticity Analysis of the Coke Drum under Moving Axial Temperature Front

GAO Bingjun GUO Lili DONG Junhua   

  1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130
  • Online:2015-03-20 Published:2015-03-20

摘要: 对焦炭塔材料15CrMoR在20 ℃、200 ℃、300 ℃及400 ℃下进行单轴拉伸试验与单轴棘轮效应试验,利用OW-II随动强化模型对材料的棘轮应变进行预测,模型能较好地预测材料稳定段的棘轮应变率。运用动态坐标系法对焦炭塔进油及进水两种工况进行瞬态温度场分析,确定轴向移动温差及其特征量,为焦炭塔循环塑性分析确定简化的温差特征载荷。对焦炭塔筒体进油生焦及进水冷焦两种工况进行循环塑性分析,发现进油及进水轴向温差渐变范围下对齐时结构具有更大的棘轮应变率,内压循环的同时作用会增大结构的棘轮应变。通过参数化计算,确定焦炭塔结构的棘轮边界,当进水轴向温差高度较小时棘轮边界受内压循环的影响较大。

关键词: 本构模型, 棘轮效应, 焦炭塔, 轴向移动温差

Abstract: Experiments of uniaxial tension and ratcheting of material of coke tower 15CrMoR are carried out under 20 ℃, 200 ℃, 300 ℃, and 400 ℃. The ratcheting strain of the material is predicted by OW-II model, which could predict the stable ratcheting strain rate of the material well. The transient temperature field under oil-feeding and water quenching are numerically simulated with the help of dynamic coordinate system method, which yields the axial temperature difference and its characteristic value for the simplified characteristic temperature load to be used in the cyclic plastic analysis of coke drum. According to the cyclic plastic analysis of coke drum cycled between oil-feeding and water quenching, the bottom alignment of temperature difference ranges produces much ratchet strain rate. In addition, the co-existence of cyclic internal pressure would increase the ratcheting strain of the structure. By parametric study, the ratchet boundary is determined for the temperature gradient under oil-feeding and water quenching. It indicates that, when temperature difference range of water quenching is smaller, the ratchet boundaries would be influenced much more by the cyclic internal pressure.

Key words: coke drum, constitutive mode, moving axial temperature front, ratcheting