针对“组合氨冷器”这类特殊结构的换热器,如何解决换热管和管板的拉脱力及密封性能,成为该类产品结构设计的关键。本文介绍一种新的连接结构,以“O”形密封圈配合螺纹堵头来密封换热管和管板,通过实验验证及设备的开车运行,证明该结构完全能够满足设备工艺要求。 Aiming at the special structure of heat exchangers such as “combined ammonia cooler”, how to solve the pull-off force and sealing performance of heat exchange tubes and tube sheets has become the key to the structural design of such products. This paper introduces a new connection structure, with “O” ring seal with thread plug to seal the heat exchange tube and tube plate, through the experimental verification and equipment running, prove that the structure can fully meet the requirements of equipment technology.