A Comparative Assessment of Coking on the Thermal Diffusion and Stress Distribution of Cr25Ni35Nb and Cr35Ni45Nb Austenitic Steel
Cr25Ni35Nb and Cr35Ni45Nb austenitic steel, used as furnace tube material in the ethylene pyrolysis furnace, generally suffer from coking during the long operation period.In the present paper, for coked Cr25Ni35Nb and Cr35Ni45Nb austenitic steel, using the finite element ABAQUS code, a sequentially coupled thermal stress procedure was developed to calculate distribution of the temperature and thermal stress field.The results show that thermal diffusion property of Cr25Ni35Nb and Cr35Ni45Nb steel deteriorates obviously with coking layer increasing.Radial bulge and rupture at local field would generate due to excess temperature for applied subsequent measurement.Maximum stress distribute along the cross-section of coking layer and metal matrix.Finally, the critical depth of coking layer of Cr25Ni35Nb and Cr35Ni45Nb austenitic steel are predicted when decoking measurement must be executed.
Cr25Ni35Nb Cr35Ni45Nb thermal diffusion mechanical property coking
Limin Shen Jianming Gong Huansheng Liu
School of Chemical Engineering & Technology,China University of Mining and Technology,Xuzhou 221116, School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 210009,China
国际会议
2014 International Symposium on Structural Integrity,ISSI2014(2014国际结构完整性学术会议)
兰州
英文
275-280
2014-08-20（万方平台首次上网日期，不代表论文的发表时间）