本文關鍵詞： 重整反應器 螺栓法蘭連接 蠕變 環(huán)境降溫 泄漏失效　出處：《潤滑與密封》2017年12期 　論文類型：期刊論文

【摘要】：針對某重整反應器封頭高溫螺栓法蘭連接系統(tǒng)在運行半年、更換保溫層并再次保溫后發(fā)生的泄漏失效問題,在考慮法蘭、螺栓等高溫蠕變的基礎上,應用瞬態(tài)熱-結構分析方法探討重整反應器螺栓法蘭接頭失效機制。結果表明:螺栓和法蘭的高溫蠕變對墊片接觸應力的影響顯著,但運行半年后最大墊片接觸應力仍大于操作密封比壓,因此高溫蠕變不是造成泄漏的主要原因;更換保溫層時外部降溫幅度對墊片接觸應力分布及大小有決定性影響,隨著降溫幅度的增大,保溫后的墊片接觸應力逐漸減小,有效密封寬度也隨之減小;當降溫幅度過大時,墊片接觸應力將下降至小于墊片操作密封比壓,墊片失去密封能力,因此更換保溫層時降溫幅度過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.
【作者單位】： 南京工業(yè)大學機械與動力工程學院;
【分類號】：TE65;TQ055.81
【正文快照】： )j縥縥縥縥縥縥縥，

本文編號：1478536