CN112614605A - Method for removing radioactive methyl iodide gas - Google Patents
Method for removing radioactive methyl iodide gas Download PDFInfo
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- CN112614605A CN112614605A CN202011337180.4A CN202011337180A CN112614605A CN 112614605 A CN112614605 A CN 112614605A CN 202011337180 A CN202011337180 A CN 202011337180A CN 112614605 A CN112614605 A CN 112614605A
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- methyl iodide
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- sodium hydroxide
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
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Abstract
The invention relates to a method for purifying radioactive methyl iodide-containing gas, which comprises the following steps: (1) under normal pressure, gas containing radioactive methyl iodide passes through an ozone oxidation chamber at a certain airflow speed, 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 sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow rate to enable the gas to be treated to form aerosol; (3) filtering the aerosol formed in step (2) using a fibrous filter and discharging the filtered gas into a ventilation system. According to the invention, methyl iodide is placed in an ozone environment for oxidation reaction, and is leached by an alkali solution to finally form aerosol, and the aerosol is removed by using a fiber filter which is relatively easy to treat, so that the purification efficiency is higher, and the final waste is relatively easy to treat.
Description
Technical Field
The invention belongs to the technical field of nuclear industry, and relates to a method for removing radioactive methyl iodide gas.
Background
The release of radioactive nuclides is accompanied in the operation process of nuclear facilities or under accident conditions, so that great harm is caused to the environment and human beings, and therefore how to control radioactive pollution becomes a key problem for safely and effectively utilizing nuclear energy. Among the many radionuclides, radioactive iodine is considered the most harmful radionuclide due to its high radioactivity, chemical toxicity and high mobility. Wherein138-141The half-life of I is extremely short, causing negligible harm129I and131i becomes the most harmful radioiodine with extremely long half-life and high specific activity, respectively. The major form of radioactive iodine exists in the gaseous state, i.e., as molecular iodine and methyl iodide. Effective purification of gaseous radioactive iodine plays a crucial role in the safe utilization of nuclear energy and environmental protection.
At present, the purification method of gaseous radioactive iodine is mainly divided into a liquid absorption method and a solid adsorption method, and mainly takes adsorption removal by a solid adsorbent as a main method. The solid adsorbent purification method has high efficiency on elementary iodine, and the methyl iodide is removed by chemical adsorption after load modification. The traditional activated carbon adsorbent is commonly used for removing the radioactive methyl iodide in the nuclear facility, but has the problems of strict humidity control, high replacement frequency, difficult waste treatment and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for removing radioactive methyl iodide gas, which is used for improving the removal efficiency of the radioactive methyl iodide gas and reducing the difficulty in waste treatment.
In order to achieve the above purposes, the invention adopts the technical scheme that: there is provided a method of purifying a radioactive methyl iodide-containing gas, the method comprising the steps of:
(1) under normal pressure, gas containing radioactive methyl iodide passes through an ozone oxidation chamber at a certain airflow speed, 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 sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow rate to enable the gas to be treated to form aerosol;
(3) filtering the aerosol formed in step (2) using a fibrous filter and discharging the filtered gas into a ventilation system.
Further, the temperature range of the ozone oxidation reaction is 15-150 ℃.
Further, the concentration range of the methyl iodide is 0-105ppm。
Further, the concentration of ozone in the ozone oxidation chamber is more than 100 ppm.
Further, the sodium hydroxide concentration of the sodium hydroxide leacheate ranges from 0 to 103mol/L。
Further, the fiber filter is a glass fiber filter.
Further, the filtration efficiency of the glass fiber filter is greater than 99%.
Further, the flow rate of the gas stream in the radioactive methyl iodide-containing gas of the step (1) is 0.1 to 5 m/s.
Further, the leaching flow of the sodium hydroxide leaching solution in the step (2) is 0.2L-10L/min.
The invention has the beneficial technical effects that:
1. the method comprises the steps of placing methyl iodide in an ozone environment for oxidation reaction, leaching with an alkali solution to finally form aerosol, and removing the aerosol by using a fiber filter which is relatively easy to treat;
2. the invention effectively solves the problem that the waste of the activated carbon absorber is difficult to compress and treat finally: the invention converts the radioactive methyl iodide gas into the aerosol, and then carries out purification treatment by using the fiber filter, thereby having higher purification efficiency and easier treatment of final waste.
Drawings
FIG. 1 is a schematic view of the radioactive methyl iodide gas removal scheme of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a method for purifying a radioactive methyl iodide-containing gas, comprising the steps of: (1) under normal pressure, gas containing radioactive methyl iodide passes through an ozone oxidation chamber at a certain airflow speed, 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 sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow rate to enable the gas to be treated to form aerosol;
(3) filtering the aerosol formed in step (2) using a fibrous filter and discharging the filtered gas into a ventilation system.
Example 1
The concentration of methyl iodide is 0.001ppm, the flow velocity of air flow is 0.5m/s, the air flow enters an ozone oxidation chamber under normal pressure, the reaction temperature is 25 ℃, the concentration of ozone is 5000ppm, the concentration of sodium hydroxide leacheate is 0.1mol/L, the leaching flow is 1L/min, a glass fiber filter is adopted as an aerosol filter, and the delivery efficiency is 99.9%. After purification by the process, the removal efficiency of methyl iodide is 99%.
Example 2
The radioactive methyl iodide concentration is 10000Bq, the airflow velocity is 1.5m/s, the atmospheric pressure airflow enters the ozone oxidation chamber, the reaction temperature is 60 ℃, the ozone concentration is 8000ppm, the sodium hydroxide leacheate concentration is 0.1mol/L, the leaching flow is 0.5L/min, the aerosol filter adopts a glass fiber filter, and the delivery efficiency is 99.9%. After purification by the process, the removal efficiency of methyl iodide is 99.5%.
It will be appreciated by those skilled in the art that the method and system of the present invention are not limited to the embodiments described in the detailed description, which is for the purpose of explanation and not limitation. Other embodiments will be apparent to those skilled in the art from the following detailed description, which is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method of purifying a gas containing radioactive methyl iodide, the method comprising the steps of:
(1) under normal pressure, gas containing radioactive methyl iodide passes through an ozone oxidation chamber at a certain airflow speed, 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 sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow rate to enable the gas to be treated to form aerosol;
(3) filtering the aerosol formed in step (2) using a fibrous filter and discharging the filtered gas into a ventilation system.
2. The method for purifying a radioactive methyl iodide-containing gas according to claim 1, wherein the temperature of the ozone oxidation reaction is in a range of 15 to 150 ℃.
3. A method of purifying a gas containing radioactive methyl iodide as claimed in claim 1, wherein the concentration of methyl iodide is in the range of 0 to 105ppm。
4. The method for purifying a radioactive methyl iodide-containing gas according to claim 1, wherein the concentration of ozone in the ozone oxidation chamber is greater than 100 ppm.
5. A method of purifying a gas containing radioiodine as claimed in claim 1, wherein the sodium hydroxide concentration of the sodium hydroxide leacheate is in the range of 0 to 103mol/L。
6. The method for purifying a radioactive-iodomethane-containing gas according to claim 1, wherein the fiber filter is a glass fiber filter.
7. The method for purifying a radioactive methyl iodide-containing gas according to claim 6, wherein the glass fiber filter has a filtration efficiency of more than 99%.
8. A method for purifying a gas containing radioactive methyl iodide as claimed in claim 1, wherein the flow rate of the gas stream in the radioactive methyl iodide-containing gas of the step (1) is 0.1 to 5 m/s.
9. The method for purifying a gas containing radioiodine of claim 1, wherein the flow rate of the sodium hydroxide eluent in the step (2) is 0.2L to 10L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337180.4A CN112614605A (en) | 2020-11-25 | 2020-11-25 | Method for removing radioactive methyl iodide gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337180.4A CN112614605A (en) | 2020-11-25 | 2020-11-25 | Method for removing radioactive methyl iodide gas |
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| CN112614605A true CN112614605A (en) | 2021-04-06 |
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| CN202011337180.4A Pending CN112614605A (en) | 2020-11-25 | 2020-11-25 | Method for removing radioactive methyl iodide gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512254A (en) * | 2022-01-27 | 2022-05-17 | 中国原子能科学研究院 | Method for trapping gaseous iodine |
| CN114832621A (en) * | 2022-04-08 | 2022-08-02 | 中国辐射防护研究院 | Radioactive methyl iodide trapping preprocessing device |
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| US20120087853A1 (en) * | 2010-10-08 | 2012-04-12 | City University Of Hong Kong | Gas treatment by catalytic ozone oxidation |
| JP2012247337A (en) * | 2011-05-30 | 2012-12-13 | Japan Environment Research Co Ltd | Radioactive organic iodine removal filter and radioactive organic iodine removal method |
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Patent Citations (5)
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| CN1617757A (en) * | 2001-07-31 | 2005-05-18 | 欧内斯特·赖尔斯 | Tropospheric volume elements enriched with vital elements and/or protective substances |
| US20120087853A1 (en) * | 2010-10-08 | 2012-04-12 | City University Of Hong Kong | Gas treatment by catalytic ozone oxidation |
| JP2012247337A (en) * | 2011-05-30 | 2012-12-13 | Japan Environment Research Co Ltd | Radioactive organic iodine removal filter and radioactive organic iodine removal method |
| CN110529947A (en) * | 2019-09-26 | 2019-12-03 | 北京金茂绿建科技有限公司 | Integrated ion waterfall purifies and self-cleaning function in concentrated new trend processor of an organic whole |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512254A (en) * | 2022-01-27 | 2022-05-17 | 中国原子能科学研究院 | Method for trapping gaseous iodine |
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| CN114832621A (en) * | 2022-04-08 | 2022-08-02 | 中国辐射防护研究院 | Radioactive methyl iodide trapping preprocessing device |
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