Iodomethane test method and method for testing adsorption efficiency of activated carbon

A technology of activated carbon adsorption and testing methods, applied in separation methods, chemical instruments and methods, measuring devices, etc., can solve problems such as radioactive leakage, operators and environmental pollution, achieve reliable results, accurate test results, and solve the problem of radioactive methyl iodide leaked effect

Active Publication Date: 2019-10-18
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

However, radioactive iodine element is needed when using the above method to test the efficiency of iodine adsorber, and radioactive iodine may have the problem of radioactive leakage no ma

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  • Iodomethane test method and method for testing adsorption efficiency of activated carbon
  • Iodomethane test method and method for testing adsorption efficiency of activated carbon
  • Iodomethane test method and method for testing adsorption efficiency of activated carbon

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Example Embodiment

[0040] Example 1

[0041] The mixed gas of air and stable methyl iodide is passed through the activated carbon adsorber, where the concentration of stable methyl iodide in the mixed gas is 50 ppm; the activated carbon filling amount in the activated carbon adsorber is 30 kg. Adding stable methyl iodide to the mixed gas is beneficial to make the final test result more accurate.

[0042] The conditions for the mixed gas of air and stable methyl iodide to pass through the activated carbon adsorber are: a temperature of 25°C, a relative humidity of 35%, and a mixed gas flow rate of 1.2 cm / s.

[0043] Before the mixed gas passes through the activated carbon adsorber, pulse injection of methyl iodide with a total concentration of 500 ppm (the sum of stable methyl iodide concentration and pulsed methyl iodide concentration) is immediately sampled downstream of the activated carbon adsorber. The downstream sampling time is 3 min / The sampling volume is 0.5L / piece, and the total number of sa...

Example Embodiment

[0047] Example 2

[0048] The mixed gas of air and stable methyl iodide is passed through the activated carbon adsorber, where the concentration of stable methyl iodide in the mixed gas is 5 ppm; the activated carbon filling amount in the activated carbon adsorber is 40 kg. Adding stable methyl iodide to the mixed gas is beneficial to make the final test result more accurate.

[0049] The conditions for the mixed gas of air and stable methyl iodide to pass through the activated carbon adsorber are: a temperature of 45° C., a relative humidity of 40%, and a mixed gas flow rate of 1.2 cm / s.

[0050] Before the mixed gas passes through the activated carbon adsorber, continue to inject methyl iodide for 20 minutes, and continue sampling upstream of the activated carbon adsorber before adsorption and downstream of the activated carbon adsorber after adsorption. The sampling time is 3min / piece, the upstream sampling time is 45min, and the downstream sampling time For 60 minutes, each samp...

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Abstract

The invention provides a iodomethane test method and a method for testing adsorption efficiency of activated carbon and belongs to the technical field of the nuclear industry. The test method tests iodomethane content of a to-be-detected sample by adopting gas chromatography, wherein filler of a chromatographic column is activated carbon and/or an activated molecular sieve; water content of the activated carbon is less than or equal to 2%, and particle size of the activated carbon is less than or equal to 0.5mm; and the activated molecular sieve is obtained by activating a molecular sieve at the temperature of 300-700 DEG C and an absolute pressure lower than 101kPa. The iodomethane test method provided by the invention can test and obtain the iodomethane content without using radioactiveiodomethane, and the problem that the radioactive iodomethane leaks and irradiates personnel when the radioactive iodomethane is adopted for testing in the prior art is effectively solved; meanwhile,the method provided by the invention is accurate and reliable in test result.

Description

technical field [0001] The invention relates to the technical field of nuclear industry, in particular to a method for testing methyl iodide and a method for testing the adsorption efficiency of activated carbon. Background technique [0002] Activated carbon iodine adsorbers are usually installed in the ventilation systems of nuclear facilities such as nuclear power plants to remove gaseous iodine generated during normal operation or under accident conditions, so as to protect workers, the public and the environment from radiation hazards. The effectiveness of the iodine adsorber needs to be evaluated after it is first installed or replaced, and it also needs to be verified after a period of operation to ensure the integrity and reliability of its iodine removal and filtration function. [0003] The radioactive methyl iodide method usually used for the test method of activated carbon efficiency of iodine adsorber, that is, methyl iodide labeled with I-131 is used as the tes...

Claims

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Application Information

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IPC IPC(8): G01N30/88B01D53/02B01J20/20
CPCB01D53/02B01D2253/102B01D2257/2068B01J20/20G01N30/88G01N2030/8845
Inventor 李永国张渊俞杰张雪平邱继林王坤俊韩丽红张崇文李世军王龙江乔太飞吴涛
Owner CHINA INST FOR RADIATION PROTECTION
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