【摘要】 在工业生产或科学实验过程中,出于安全因素或是保护产品的目的,需用惰性气体或其他气体对相关管道、容器或密闭空间内的初始气体进行置换。本文介绍了近年来气体置换技术在化工、航天及低温等领域的研究及应用进展情况,重点是在天然气管道投产置换、火箭液氢加注系统加注前置换、LNG低温储罐投用置换、常压热环境试验湿空气置换等领域的研究及应用情况,同时也介绍了在煤矿瓦斯置换、低温液体管路置换等方面的研究及应用情况,提出了气体置换技术在很多应用领域的基础理论研究和计算分析方面还有所缺乏的问题,特别是在由纯净氮气置换湿空气来实现低露点的航天常压热环境试验中,为了掌握气体混合机理及置换效果影响因素等,急需进一步的理论分析和实验验证。更多还原

【Abstract】 In the industrial production and scientific experiment,for security reasons or protection of the product,the initial gas in the pipeline,vessel or confined space should be replaced with inert gas or other gases.The paper introduces the recent research and application progress of gas displacement in the areas of chemical,aerospace and cryogenics.The focus is on the research and application situation of the displacement of natural gas pipeline,rocket’s liquid hydrogen filling system,LNG cryogenic storage tank,atmospheric thermal environment experiment and other fields.The displacement of coal mine gas,cryogenics liquid pipeline is also introduced.The lack of research and calculation of the basic theory of gas displacement technology in many applications is proposed.Especially,in order to grasp the gas mixing mechanism and influence factors of displacement,theoretical analysis and experimental verification are urgent need for more to obtain low dew point in the atmospheric thermal environment experiment by nitrogen displacement.更多还原