碘吸附器泄漏率检测的方法与影响因素探讨

辐射防护 ›› 2018, Vol. 38 ›› Issue (6): 496-501.

碘吸附器泄漏率检测的方法与影响因素探讨

梁飞, 张计荣, 张渊, 张崇文, 张昭辰

中国辐射防护研究院,太原 030006

收稿日期:2017-09-23 出版日期:2018-11-20 发布日期:2020-07-21
作者简介:梁飞(1985—),男,2012年毕业于山西大学化学化工学院有机化学专业,助理研究员。E-mail:LF665157@163.com

Study on methods and influence factors of mechanical leakage tests for iodine adsorbers

LIANG Fei, ZHANG Jirong, ZHANG Yuan, ZHANG Chongwen, ZHANG Zhaochen

China Institute for Radiation Protection, Taiyuan 030006

Received:2017-09-23 Online:2018-11-20 Published:2020-07-21

摘要/Abstract

摘要： 探讨了用于检验碘吸附器机械泄漏率的几种示踪气体的可行性,包括三氯氟甲烷(R-11)、十氟戊烷(Vertrel-XF)、全氟甲基环戊烷(PMCP)、全氟甲基环己烷(PMCH)及全氟二甲基环己烷(PDCH);在检验碘吸附器泄漏率现场试验期间,分析了示踪剂的分子量和沸点、温度、气流比速、湿度及活性炭含水量等影响因素对示踪气体发生解吸的影响;以R-11为示踪剂分别进行不同湿度环境下碘吸附器机械泄漏率的验证试验和不同含水量活性炭的吸附效率实验;结果表明:Vertrel-XF、PMCP、PMCH和PDCH均满足美国机械工程师协会核空气与气体处理规范(ASME AG-1)中关于替代物的六项标准;气流相对湿度小于20%,活性炭含水量小于15%时,R-11在活性炭上的解吸量很少,因此检测结果更加接近真实值;目前,国内核电厂以R-11测得碘吸附器的机械泄漏率偏结果保守。

关键词: 示踪气体, 泄漏率, 解吸

Abstract: The applicability of several tracer gases for performance tests of iodine adsorbers were studied. Tracer gases investigated are trichlorofluoromethane (R-11), 1,1,1,2,2,3,4,5,5,5-decafluoro-pentane (Vertrel-XF), perfluoromethycylcopentane (PMCP), perfluoromethycyclohexane (PMCH), and perfluorodimethylcyclohexane (PDCH). Desorption behaviors of tracer gases from activated carbon affected by molecular weight, boiling point, temperatures, air velocity, moisture, water content of activated carbon were studied. R-11 was used in measuring mechanical leakage rates of iodine adsorbers at different levels of moisture loading. Meanwhile desorption efficiency of activated charcoal bed were measured after R-11 injection. Results show that the above alternative substitute gases (tracers) all meet the six criteria in Non-Mandatory Appendix TA-C of AG-1: Substitute Gas and Aerosol Substitute Selection Criteria. R-11 exhibited minimal desorption from activated carbon at less than 20% relative humidity of gas stream and 15% water content of activated carbon.Its result was more accurate.R-11 is now generally used in domestic nuclear power plants to measure mechanical leakage rates of iodine adsorbers.

Key words: tracer gas, leakage rate, desorption

中图分类号:

O644.2

梁飞, 张计荣, 张渊, 张崇文, 张昭辰. 碘吸附器泄漏率检测的方法与影响因素探讨[J]. 辐射防护, 2018, 38(6): 496-501.

LIANG Fei, ZHANG Jirong, ZHANG Yuan, ZHANG Chongwen, ZHANG Zhaochen. Study on methods and influence factors of mechanical leakage tests for iodine adsorbers[J]. RADIATION PROTECTION, 2018, 38(6): 496-501.

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