Journal of Liaoning Petrochemical University

Journal of Liaoning Petrochemical University ›› 2005, Vol. 25 ›› Issue (3): 39-42.

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Reason and Prevention of Cracking on Tube Sheet of Oil Slurry Stream Generator

  

  1. 1 .School of Mechanical Engineering , Liaoning University of Petroleum & Chemical Technology , Fushun Liaoning 113001 ,P .R .China ;
    2 .Zhongyuan Oil Field , No .6 Oil Ex traction Factory , Heze Shandong 247511, P .R .China
  • Received:2005-04-18 Published:2005-03-25 Online:2005-03-25

重催油浆蒸气发生器管板开裂原因及防治

于 明1 , 宋天民1 , 张国福1 , 杜 栓2 , 刘玉英1   

  1. 1 .辽宁石油化工大学机械工程学院, 辽宁抚顺113001 ;
    2 .中原油田采油六厂, 山东荷泽247511
  • 作者简介:于明(1978 -), 女, 辽宁铁岭市, 在读硕士。
  • 基金资助:
    中石化集团公司资助项目(303009)。

Abstract:

        The steam generator of Jinzhou refinery is head-floating steam generator w hose tube sheet was cracked after it was put into use in mo re then a year .The wide -area cracks in the tube sheet of oil slurry steam generator were found, and the cracks star ted from the tube bundles, and went along with the direction of radius.With the cor relation method, the metalloscopy method and the crack mechanics analytic method , the reason of the cracking on the CCU tube -plate was analyzed .The chemical components, mechanical proper ties , the appearance of cracks in macro and micro of the samples were analyzed .Experimental result indicates that both the chemical components and mechanical proper ties of the tube sheet meet GB6654 -96 , that is to say , material do not result in cracking o n the CCU tube -plate.Cracks meet the feature of stress corrosion.The generating and flowing of the stream induces pipe bundle vibration that becomes especially stronger under the action of g as -fluid two phase flow , which produces cyclic load on the welded joint of tube -plate and bring s fatigue broken .The conclusion is that an interaction between fatigue and stress corrosion is the reason of the cracking on the CCU tube -plate.Fatigue is the more important reason o f the cracking on the CCU tube -plate .The improvements of preventing cracks are put forward.

Key words:  Oil slurry steam generator ,  Cracks in tube -plate,  Fatigue ,  Stress co rrosion

摘要:      锦州石化公司催化裂化装置油浆蒸气发生器, 为浮头式蒸气发生器, 投入使用一年多就发生失效, 其失效形式表现为蒸气发生器管板大面积开裂, 裂纹大多从管束开始呈环状及径向管板延伸。利用对比法、金相显微
分析方法以及开裂机理分析方法, 对重催油浆蒸气发生器管板开裂原因进行了管板化学成份、管板机械性能、宏观、微观断口形貌及管板开裂过程分析。实验结表明, 管板的化学成份和机械性能均符合国标GB6654-96 , 说明管板
开裂不是由于材质本身造成的;裂纹符合应力腐蚀特征;壳程内蒸气的发生和流动诱发振动, 使管束发生振动, 特别在汽液两相流作用下使振动加剧, 使管板焊接接头位产生循环载荷造成疲劳破坏。得出疲劳和应力腐蚀共同作用引起重催油浆蒸气发生器管板的开裂, 其中疲劳是管板开裂的最重要的原因。提出了简单易行的改进措施。

关键词: 油浆蒸气发生器,  管板开裂,  疲劳,  应力腐蚀

Cite this article

YU Ming, SONG Tian -min,et al. Reason and Prevention of Cracking on Tube Sheet of Oil Slurry Stream Generator[J]. Journal of Liaoning Petrochemical University, 2005, 25(3): 39-42.

于 明, 宋天民,等. 重催油浆蒸气发生器管板开裂原因及防治[J]. 辽宁石油化工大学学报, 2005, 25(3): 39-42.

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