A kind of tcd gas chromatography multi-stage circulation separation kr system and method

Abstract

The present invention provides a TCD gas chromatography multi-stage circulation separation Kr system and method, the system includes: mass flow controller, flow totalizer, six-way valve SV1-SV3, four-way valve FV1-FV2, 1 / 4 activated carbon adsorption column , 1 / 8 activated carbon adsorption column, quantitative loop, carrier gas bottle and TCD gas chromatograph. A TCD gas chromatography multi-stage circulation separation Kr system and method provided by the present invention can not only monitor all concentration and separation steps, but also realize multiple precise cutting and collection of krypton peaks, which not only greatly improves the recovery rate, but also the special design only The use of two-stage separation columns can achieve multiple recycling to achieve multi-stage effects, reducing the number of concentrated separation columns used.

Description

technical field [0001] The invention belongs to the technical field of radiation environment monitoring, and in particular relates to a TCD gas chromatography multi-stage cyclic separation Kr system and method. Background technique [0002] The inert gas emitted by nuclear facilities to the environment is mainly Kr-85, and with a long half-life (10.7 years), the annual growth rate of the global average concentration of Kr-85 is 30mBq / m 3 This nuclide will be enriched in the environment, which will have a long-term impact on the global environment. In the long run, Kr-85 will increase the dose contribution to the public over time. To a certain extent, it is necessary to pay attention to the emission of Kr-85 from nuclear facilities. quantity. By monitoring the Kr-85 activity concentration level in the ambient air around nuclear facilities, abnormal emissions from nuclear facilities can be monitored, and corresponding monitoring can be carried out in a timely manner, which is...

AI Technical Summary

Problems solved by technology

The unstable adsorption performance of the concentrated separation column will cause the data quality of the Kr-85 monitoring system to deteriorate, and the uncertainty is difficult to control

The low-temperature frozen multi-stage activated carbon Kr concentration and separation system has a relatively big problem that each stage lacks monitoring methods, and the energy absorption performance of a certain stage deteriorates. The system can only be disassembled and checked step by step.

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