某法兰连接结构更换保温层后的泄漏失效分析

发布时间：2018-01-31 07:07

  本文关键词： 重整反应器 螺栓法兰连接 蠕变 环境降温 泄漏失效　出处：《润滑与密封》2017年12期 　论文类型：期刊论文

【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。
[Abstract]:In view of the leakage failure of the high temperature bolted flange connection system of a reforming reactor after running for half a year, changing the insulation layer and holding it again, the creep of flange and bolt was considered. The failure mechanism of bolted flange joint in reforming reactor was studied by transient thermal-structural analysis. The results show that the creep of bolt and flange at high temperature has a significant effect on the contact stress of gasket. However, the maximum contact stress of gasket is still greater than the specific pressure of operation seal after six months of operation, so the creep at high temperature is not the main cause of leakage. The outer cooling range has a decisive effect on the contact stress distribution and size of the gasket when changing the insulation layer. With the increase of the cooling range, the contact stress of the gasket gradually decreases and the effective seal width decreases. When the cooling range is too large, the contact stress of the gasket will decrease to less than the specific pressure of the gasket operation seal, and the gasket will lose the sealing ability, so the main reason for the leakage is that the cooling amplitude is too large when the insulation layer is replaced.
【作者单位】： 南京工业大学机械与动力工程学院;
【分类号】：TE65;TQ055.81
【正文快照】： )j縥縥縥縥縥縥縥，

本文编号：1478536