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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 matter in the procurement, transportation, storage, management or detection process of radioactive sources, which will further affect the operators. There is some pollution to the environment

Method used

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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

Examples

Experimental program
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Effect test

Embodiment 1

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

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

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

Embodiment 2

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

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

[0050] Before the mixed gas passes through the activated carbon adsorber, continuously inject methyl iodide for 20 minutes, and continue sampling upstream before the activated carbon adsorber is adsorbed and downstream after the activated carbon adsorber is adsorbed. For 60 minutes, each collected sample is tested by gas chromatography. The gas chromatography test conditions are: the temperature of the injection port...

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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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