双端面机械密封使用故障分析

孙业洞
(大唐内蒙古多伦煤化工有限责任公司,内蒙古 多伦 027300)

摘要:双端面机械密封是一种应用较为广泛的密封形式,主要应用在工业生产中输送易燃、易爆、有毒、有害等介质的设备上。以实际使用时出现的典型故障为例进行分析,阐述了在解决实际问题的过程中,密封辅助系统冲洗方案的选择与隔离液压力及循环效果等因素对密封寿命和安全性的影响。对密封端面进行了受力分析,并根据API682标准对密封辅助系统布置方案Plan23+52的应用参数进行了分析和优化。结果表明:除了密封本身设计缺陷以外,引起密封失效的主要原因多为忽视密封辅助系统的重要性,导致其无法为密封提供不间断的冷却润滑流体,无法保证密封在良好的环境下运行。而经过优化后的密封辅助系统能保证双断面机械密封长时间连续平稳地运行。
关键词:双端面机械密封;密封辅助系统;冲洗方案;冷却系统;液体润滑
中图分类号:TH136          文献标识码:B            文章编号:1006-0316 (2012) 11-0077-04

Analysis on malfunctions of dual mechanical seals
SUN Ye-dong
( Datang Duolun Coal Chemical Company, Duolun 027300, China )

Abstract:The dual mechanical seal is commonly used in industrial process to transmit the mediums and materials which are inflammable explosive poisonous and harmful. In this paper some classical mechanical seal faults have been discussed as examples. The auxiliary system will influence the life cycle and safe of the whole seal system. So that the relationships between the selections of flush plans, pressure of seal liquid and cooling performance have been presented detailedly. The force on the end face has been discussed also. According to the API682, the parameters of auxiliary system with Plan23+52 have been analysis and optimized. The results present that the auxiliary system is important to dual mechanical seal. It is easy to break down when the auxiliary system works abnormally. After optimization, the auxiliary system can ensure the dual mechanical seal work smoothly and steadily.
Key words:dual mechanical seals;seal auxiliary system;pipe plan;cooling system;fluid lubrication

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收稿日期:2012-02-07
作者简介:孙业洞(1975-),山东肥城人,本科,工程师,主要从事于煤化工设备管理工作。


 

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