乙酸阀门内衬的损害分析及处理

聚四氟乙烯

乙酸阀门内衬的损害分析及处理
薛子文 杨东辉兖矿国泰化工有限公司,山东滕州277527

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。[著者文摘]

关键词:乙酸 阀门 聚四氟乙烯内衬 损害 处理
分类号:　TQ225.122[著者标引]文献标识码：A文章编号：1006-7906（2010）04-0051-04栏目信息：工厂实践
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Analyses and settlements to damages of linings in valves with special materials in acetic acidXUE Ziwen,YANG DonghuiYankuang Cathay Coal Chemicals Co.Ltd.,Tengzhou 277527,ChinaAbstract: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.[著者文摘]

Key words:Acetic acid; Valves; PTFE lining; Damage; Settlement