双重密封法兰研制及其密封性能  

Development and high temperature sealing performance study of double sealing flange

作　　者：张钦华[1] 唐忠锋[1,2] 傅远[1] 谢雷东[1] 黎忠[1] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院核辐射与核能技术重点实验室,上海201800

出　　处：《核技术》2013年第10期71-75,共5页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(XDA01020304)资助

摘　　要：为解决普通法兰不能在高温腐蚀环境中长期使用的问题,设计加工了一种新型双重密封管道连接法兰。该法兰采用柔性石墨缠绕垫片和金属C形密封圈双重密封结构,特有的保护气设计使石墨缠绕垫片能在高温下不被氧化而长期稳定使用;同时建立一套试验台架对双重密封法兰高温密封性能进行测试。结果表明:该双重密封法兰在750 oC、0.7 MPa保温43 h条件下,其法兰整体泄漏率几乎为零,达到并满足使用要求。该技术解决了传统法兰采用石墨垫片易被氧化和采用金属垫片易被腐蚀而失效的缺点,在众多领域具有广泛应用。Background： Flange is an important component used in the connection between pipes or between pipe and equipment. It is widely used in mechanical industry, petrochemical industry and nuclear industry. Ordinary flange could be oxidized or corroded under high temperature and strong corrosion condition, which leads to flange＇s failure. Purpose： The aim is to design and validate the double sealing flange which could be used in high temperature and strong corrosion condition stably and supplied as a reliable detachable connection for petrochemical industry and nuclear industry under high temperature and strong corrosion environment. Methods： New flange is designed using flexible graphite spiral wound gaskets and C style metal ring double sealing structure. The unique protection gas design ensures the graphite spiral wound gasket used in high temperature reliably. Test bed is built to verify the stability of the flange. Results： Pressure reducing of graphite spiral wound gasket is only 0.01 MPa at 750 ℃, 0.7 MPa for 43 h, there is not obvious oxidation phenomenon at the same time. The leakage rate of metal C sealing ring is 1.51x10-4 atm cc/s, and the metal C ring sealing＇s performance meets the engineering requirements. Conclusion： The leakage rate of double sealing flange is almost zero under 0.7 MPa at 750 ℃, which meets the engineering requirements. It avoids oxidizing at high temperature and corroding under strong corrosion condition.

关 键 词：法兰 管道连接 双重密封 

分 类 号：TL353.11[核科学技术—核技术及应用]