Atmospheric xenon enrichment and purification method and device

Abstract

The invention belongs to atmospheric radiation environment monitoring and nuclear facility safety running monitoring systems and methods, and particularly relates to an atmospheric xenon enrichment and purification method and device and a method for preparing a carbon molecular sieve. The atmospheric xenon enrichment and purification method mainly includes the steps of air pretreatment, three-level concentration, separation and purification, sample preparation and online stable xenon detection. M hollow fiber nitrogen-enriched membrane components of the same type and / or different types are connected in series and / or in parallel for separation in the air pretreatment process. The carbon molecular sieve is used as an adsorbent in the step of separation and purification. The problem of low enrichment efficiency of an existing atmospheric xenon enrichment and purification method and device is solved, the quantity of xenon acquired in 24 hours by the system is not smaller than 10mL, xenon volume-by-volume concentration is not lower than 30%, and quantitative uncertainty of stable xenon is less than 10%.

Description

technical field [0001] The invention belongs to a monitoring system and method for atmospheric radiation environment monitoring and safe operation of nuclear facilities, in particular to a high-efficiency atmospheric xenon enrichment and purification method and device. Background technique [0002] The volume fraction of the rare gas xenon in the air is 8.7×10 -8 (V / V), in which the content of radioactive xenon isotopes is lower and difficult to analyze directly. Radioactive gas xenon sampling is to separate and enrich xenon isotopes from the ambient atmosphere, and make it meet the quantitative detection sensitivity of xenon analysis instruments and the requirements of radioactive xenon isotope content of radioactive measuring instruments. Therefore, it is necessary to efficiently concentrate xenon from a large amount of air to in a small volume. [0003] Invented by Zhou Chongyang and others in the 63653 Unit of the Chinese People's Liberation Army, the patent number is ...

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Problems solved by technology

[0006] In order to solve the problem of low enrichment efficiency of existing atmospheric xenon enrichment and purification methods and devices, the present invention provides an atmospheric xenon enrichment and purification method with high enrichment efficiency, and simultaneously provides a xenon enrichment purification method with simple structure capable of realizing the method. The integrated purification device further solves the problem that the existing device cannot judge and evaluate the operating status of the device in time

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