上海交通大学学报

上海交通大学学报（自然版） ›› 2014, Vol. 48 ›› Issue (08): 1159-1163.

• 机械仪表工程 • 上一篇    下一篇

结焦对HP40Nb炉管传热与机械性能的影响

沈利民1，巩建鸣2，刘焕胜1，黄玉霞1
  

  1. (1. 中国矿业大学 化工学院， 江苏 徐州 221116； 2. 南京工业大学 机械与动力工程学院， 南京 211816)
     
     
     
  • 收稿日期:2013-12-16 出版日期:2014-08-28 发布日期:2014-08-28
  • 基金资助:

    国家自然科学基金资助项目(51305440)，中央高校基本科研业务费专项资金(2013QNA15)

Effect of Coking on Thermal Diffusion and Mechanical Property of HP40Nb Tube

SHEN Limin1,GONG Jianming2,LIU Huansheng1,HUANG Yuxia
  

  1. (1. School of Chemical Engineering and Technology, China University of Mining and Technology,  Xuzhou 221116， Jiangsu, China; 2. School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China)
  • Received:2013-12-16 Online:2014-08-28 Published:2014-08-28

摘要：

利用有限元软件ABAQUS，开发了顺次耦合的热应力耦合程序，对已存在结焦层的HP40Nb合金炉管开车过程中温度场和应力场分布进行数值分析，并对乙烯裂解炉管采用停车检修时的临界结焦厚度值进行了预测.结果表明：HP40Nb合金炉管的传热性能随着结焦层的增加加速降低，最大环向应力位于结焦层与HP40Nb合金界面处，应力呈现出先增后减的变化趋势；结焦引起炉管局部径向鼓胀断裂；HP40Nb炉管需要采取清焦的临界结焦层厚度为2.3 mm.
 

关键词: 结焦, HP40Nb合金, 乙烯裂解炉, 传热性能, 机械性能

Abstract:

Based on the finite element ABAQUS code, a sequentially coupled thermal stress procedure was developed to calculate the distribution of temperature and thermal stress field of coked HP40Nb tube, and the critical depth of coking layer was predicted when the decoking measurement should be conducted. The results show that the thermal diffusion property of HP40Nb alloy deteriorates sharply with coking layer increasing. The maximum circumferential stress is along the crosssection of coking layer and HP40Nb alloy, and the stress increases initially and then decreases. Coking caused the ethylene pyrolysis furnace tube to bulge to the actual radial and rupture at local field. The critical depth of coking layer was predicted to be 2.3 mm when the decoking measurement had to be executed.
 

Key words: coking, HP40Nb alloy, ethylene pyrolysis furnace, thermal diffusion, mechanical property

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