乙酸阀门内衬的损害分析及处理  

Analyses and settlements to damages of linings in valves with special materials in acetic acid

作　　者：薛子文[1] 杨东辉[1] 

机构地区：[1]兖矿国泰化工有限公司,山东滕州277527

出　　处：《化学工业与工程技术》2010年第4期51-54,共4页Journal of Chemical Industry & Engineering

摘　　要：在某300 kt/a乙酸装置中,合成反应釜自循环管线上所采用的普通型PTFE(聚四氟乙烯)内衬旋塞阀经常出现内衬损坏的情况,经分析主要原因是冷流现象导致内衬脱落,现场操作导致内衬错位,阀门半开半闭导致内衬变形,内衬热膨胀导致阀芯旋转时剪切脱落,温度升高导致PTFE力学性能下降。通过采用T475材质来取代原有的普通型PTFE内衬,并改变旋塞阀的内部结构,使旋塞阀内衬损坏的问题得到解决,取得了较好的结果。In the 300 kt/a acetic acid plant,plug valves with plain PTFE linings in self-recycling lines of synthetic reactors are often damaged.After analysis,five reasons are found as follows： the phenomenon of cold flow causes falling of linings,the operation on site causes misplacement of linings,the half-opened and half-closed situation causes the transformation of linings,the heat expansion of linings the valve plugs fall off during the process of rotation,raising temperature causes mechanic performance reduction.Through a further analysis,two solutions are worked out including replacing the prior plain PTFE linings with T475 and changing the interior structure of plug valves.

关 键 词：乙酸 阀门 聚四氟乙烯内衬 损害 处理 

分 类 号：TQ225.122[化学工程—有机化工]