基于Abaqus的焦炭塔裙座柔性槽疲劳分析  

Fatigue analysis of flexible groove of coke drum skirt based on Abaqus

作　　者：徐晓东 孙亮[1] 陈照和[1] 刘鑫 杨俊威 徐永生 XU Xiaodong;SUN Liang;CHEN Zhaohe;LIU Xin;YANG Junwei;XU Yongsheng(China Special Equipment Inspection and Research Institute,Beijing 100029,China)

机构地区：[1]中国特种设备检测研究院,北京100029

出　　处：《压力容器》2022年第3期48-54,共7页Pressure Vessel Technology

基　　金：国家市场监督管理总局科技计划项目“非常规服役条件下结构的韧性断裂行为数值模拟研究”(2021MK176)。

摘　　要：通过对焦炭塔进行有限元瞬态热应力分析,获得柔性槽上方位置的应力随时间历程曲线,并在此基础上分别采用JB 4732—1995方法和ASME BPVC方法对其进行热机械疲劳裂纹萌生寿命评估。采用焦炭塔裙座环焊缝上方测量的某一周期随时间变化的温度作为有限元热应力分析的边界条件或“热源”,对真实热源进行近似模拟。分析模型采用三维有限元模型,考虑裙座和焦炭塔间的接触传热和辐射传热、焦炭塔和环境的对流换热、外壁材料的保温作用、基座的吸热、内压、物料的加载过程等。采用JB 4732—1995方法和ASME BPVC方法获得疲劳寿命分别为6.3年和6.65年,误差为5.3%,二者很接近。该分析方法和结果为预测和控制焦炭塔寿命提供参考,保证其安全平稳运行,最大程度地发挥焦炭塔的使用价值,从而提高经济效益。The transient thermal stress of coke drum was analyzed by finite element method and the stress history curve of the location over the flexible groove was obtained.On this basis,JB 4732—1995 and ASME BPVC methods were used separately to evaluate the thermal mechanical fatigue crack initiation life of the flexible groove of coke drum.The time-varying temperature of a period measured above the girth weld of coke tower skirt was used as the boundary condition or heat source for finite element thermal stress analysis to approximate simulation of the real heat source.The three-dimensional finite element model was adopted in the analysis.This analysis considered the effects of the following factors:the contact heat transfer and radiation transfer between the skirt and the coke drum,the convection heat transfer between the coke drum and the environment,the heat preservation effect of the outer wall material,the heat absorption of the base,the internal pressure,the material loading process,etc.The fatigue life obtained by JB 4732—1995 method and ASME BPVC method is 6.3 years and 6.65 years respectively,which are very close to each other since the difference between the two methods is 5.3%.The analysis method and results herein provide a reference for predicting and controlling the life of coke drum,ensuring its safe and stable operation,maximizing the use value of coke drum and improving economic benefits.

关 键 词：焦炭塔 裙座 柔性槽 疲劳分析 裂纹 

分 类 号：TH136[机械工程—机械制造及自动化] TQ053.5[化学工程]