Method for removing radioactive methyl iodide gas

A technology of radioactive iodine and radioactive methyl iodide, which is applied in the field of radioactive methyl iodide gas removal, can solve the problems of difficult waste disposal and high replacement frequency, and achieve the effects of easy disposal and high purification efficiency

Pending Publication Date: 2021-04-06
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional activated carbon adsorbents are often used to remove radioactive methyl iodide in nuclear facilities, but there are problems such as strict humidity control, high replacement frequency and difficult waste disposal

Method used

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  • Method for removing radioactive methyl iodide gas

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Experimental program
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Effect test

Embodiment 1

[0026] The concentration of methyl iodide is 0.001ppm, the airflow velocity is 0.5m / s, the atmospheric airflow enters the ozone oxidation chamber, the reaction temperature is 25°C, the ozone concentration is 5000ppm, the sodium hydroxide eluent concentration is 0.1mol / L, and the eluent flow rate The aerosol filter adopts glass fiber filter, and its factory efficiency is 99.9%. After purification by this process, the removal efficiency of methyl iodide is 99%.

Embodiment 2

[0028] The concentration of radioactive methyl iodide is 10000Bq, the airflow velocity is 1.5m / s, the atmospheric airflow enters the ozone oxidation chamber, the reaction temperature is 60°C, the ozone concentration is 8000ppm, the sodium hydroxide eluent concentration is 0.1mol / L, and the eluent flow rate The aerosol filter is 0.5L / min, and the aerosol filter adopts a glass fiber filter, and its ex-factory efficiency is 99.9%. After purification by this process, the removal efficiency of methyl iodide is 99.5%.

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Abstract

The invention relates to a purification method of radioactive iodomethane-containing gas, which comprises the following steps: (1) under normal pressure, the radioactive iodomethane-containing gas passes through an ozone oxidation chamber at a certain gas flow velocity, and the ozone oxidation chamber is filled with ozone with a certain concentration; (2) introducing the gas flowing out of the ozone oxidation chamber into a sodium hydroxide leaching chamber, and spraying a sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow, so that the gas to be treated forms aerosol; and (3) filtering the aerosol formed in the step (2) by using a fiber filter, and discharging the filtered gas into a ventilation system. According to the method, methyl iodide is placed in an ozone environment for an oxidation reaction, aerosol is finally formed through leaching of an alkaline solution, a fiber filter which is relatively easy to treat is used for removing, the purification efficiency is high, and final waste is easy to treat.

Description

technical field [0001] The invention belongs to the technical field of nuclear industry and relates to a method for removing radioactive methyl iodide gas. Background technique [0002] The release of radionuclides will be accompanied by the release of radionuclides during the operation of nuclear facilities or under accident conditions, which will cause great harm to the environment and human beings. Therefore, how to control radioactive pollution has become a key issue in the safe and effective use of nuclear energy. Among many radionuclides, radioactive iodine is considered to be the most harmful radionuclide because of its high radioactivity, chemical toxicity and high mobility. in 138-141 The half-life of I is extremely short, causing negligible harm, while 129 I and 131 I is the most harmful radioactive iodine isotope due to its extremely long half-life and high specific activity. The main form of radioactive iodine is gaseous, that is, in the form of molecular iod...

Claims

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Application Information

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IPC IPC(8): G21F9/02
CPCG21F9/02
Inventor 李永国俞杰李世军张雪平任宏正杨凯梁栋陈建利张崇文侯建荣丘丹圭刘群
Owner CHINA INST FOR RADIATION PROTECTION
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