An experimental system for performance testing of methyl iodide adsorption materials

Abstract

The invention relates to the technical field of nuclear radiation protection, and specifically discloses an experimental system for performance testing of methyl iodide adsorption materials, which adopts a double-bed structure in which an experimental adsorption bed and a control bed are symmetrically arranged, and can be used as adsorption efficiency data In order to remove the influence of the adsorption performance of the substrate material, the control bed can be used to adjust the working conditions in the early stage of the experiment, so as to reduce the influence of the gas flow on the performance of the adsorption material during the initial working condition adjustment and the preheating stage of the experimental adsorption bed and the control bed. . The invention can realize the performance test of different methyl iodide adsorption materials under a wide range of thermal conditions such as temperature and pressure, has comprehensive functions, does not need other supporting devices, and has high measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation protection, and in particular relates to an experimental system for performance testing of methyl iodide adsorption materials. Background technique [0002] After a serious accident in a nuclear power plant, the pressure in the containment will gradually increase. In the case of failure of the containment cooling system, the integrity of the containment may be destroyed due to overpressure, resulting in the leakage of radioactive substances. The containment filtration and discharge system uses active pressure relief to reduce the pressure in the containment, so that the pressure in the containment does not exceed its bearing limit and ensures the integrity of the containment; at the same time, in order to prevent the exhaust gas from causing radioactive hazards to the environment, A filter device is installed on the pressure relief pipeline of the filter discharge system to filter the ra...

AI Technical Summary

Problems solved by technology

The radioactive substances in the exhaust gas mainly exist in the form of aerosols (CsI, CsOH), gaseous elemental iodine and gaseous organic iodine. Considering that the content of organic iodine is small and difficult to measure in previous nuclear power projects, there is no requirement to filter organic iodine. However, after the Fukushima nuclear accident, it was found that the content of organic iodine in the released radioactive substances was relatively large, and organic iodine was easily absorbed by the thyroid gland of the human body and caused harm to the human body. Therefore, for the new The first-generation containment filtration and drainage system needs to improve its filtration efficiency for organic iodine

[0003] At present, there are few domestic studies on the performance of organic iodine adsorption materials. A tritium gas adsorption performance experimental device and method designed in patent 202010542892.3 is designed for the adsorption performance research of adsorbents under normal temperature and pressure conditions, but it is not applicable. under complex thermal conditions

[0004] The experimental research on the adsorption performance of methyl iodide abroad is relatively in-depth, and the literature "Silver-mordenite forradiologic gas capture from complex streams: Dual catalytic CH 3 In "I decomposition and I confinement", the experimental device is designed for the performance test of the adsorption material under the condition of multi-component gas. The multi-adsorption bed series design is used to conduct experimental research on the influence of complex gas components under severe accident conditions. The design uses an inductor Coupling plasma mass spectrometer and gas chromatography-flame ionization detector and other instruments for measurement, but does not consider the influence of thermal parameters, this device is not suitable for high temperature, high pressure and high steam ratio in terms of structure and measurement function

Literature "Effects of water vapor and temperature on the retention of radiotoxic CH 3 In "I by silver faujasite zeolites", the experimental device is designed for the performance test experiment of the adsorption material under different temperature and steam share conditions, which is used to study the influence of accident conditions on its performance. The activated carbon box is used to absorb the gas and measure the gas concentration based on the radioactive content of the gas. , this device is not suitable for high-pressure experimental environments, and the measurement method based on the radioactive content of the gas is relatively harsh

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