文章摘要
孙杰,陆晓峰,朱晓磊.某法兰连接结构更换保温层后的泄漏失效分析[J].润滑与密封,2017,42(12):110-114
某法兰连接结构更换保温层后的泄漏失效分析
Leakage Failure Analysis on Flange Connection Structure in Header of Reforming Reactor
  
DOI:10.3969/j.issn.0254-0150.2017.12.021
中文关键词: 重整反应器  螺栓法兰连接  蠕变  环境降温  泄漏失效
英文关键词: reforming reactor  bolted flange connection  creep  ambient cooling  leakage failure
基金项目:
作者单位E-mail
孙杰 南京工业大学机械与动力工程学院 568877536@qq.com 
陆晓峰   
朱晓磊   
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中文摘要:
      针对某重整反应器封头高温螺栓法兰连接系统在运行半年、更换保温层并再次保温后发生的泄漏失效问题,在考虑法兰、螺栓等高温蠕变的基础上,应用瞬态热-结构分析方法探讨重整反应器螺栓法兰接头失效机制。结果表明:螺栓和法兰的高温蠕变对垫片接触应力的影响显著,但运行半年后最大垫片接触应力仍大于操作密封比压,因此高温蠕变不是造成泄漏的主要原因;更换保温层时外部降温幅度对垫片接触应力分布及大小有决定性影响,随着降温幅度的增大,保温后的垫片接触应力逐渐减小,有效密封宽度也随之减小;当降温幅度过大时,垫片接触应力将下降至小于垫片操作密封比压,垫片失去密封能力,因此更换保温层时降温幅度过大是造成泄漏的主要原因。
英文摘要:
      The leakage failure occurs for the head flange connection system of a reforming reactor after the insulation layer is replaced and the reforming reactor has been running for six months.In order to solve this problem,the failure mechanism considering elevated temperature creep of flanges and bolts was studied by transient thermal structure analysis.Results show that the elevated temperature creep of bolts and flanges has a significant effect on the contact stress of gasket,but the maximum contact stress of gasket of the head flange connection system is greater than the operating specific pressure of gasket after six months’ service,therefore the elevated temperature creep of bolts and flanges is not the main cause of leakage.Cooling amplitude on the outer surface of the flange joint when replacing the insulation layer has a significant influence on contact stress of the gasket.With the increasing of cooling amplitude,the contact stress of gasket is gradually reduced,and the effective sealing width is also reduced.When the cooling amplitude is too large,the contact stress of gasket will decrease to be less than the operating specific pressure of gasket,and the gasket will lose the sealing capacity.Therefore,the excessive cooling amplitude when replacing the insulation layer is the main cause of leakage.
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