CN111006914A

CN111006914A - Quick sampling clamp for efficiency test of iodine adsorber

Info

Publication number: CN111006914A
Application number: CN201911119513.3A
Authority: CN
Inventors: 俞杰; 杜建兴; 杨凯; 吴潞华; 吴振龙; 张鹏; 边守利; 梁飞; 乔太飞; 林海鹏; 侯建荣; 路富强; 邱继林
Original assignee: China Institute for Radiation Protection
Current assignee: China Institute for Radiation Protection
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-04-14

Abstract

The invention provides a rapid sampling clamp for an iodine adsorber efficiency test, which comprises an upper end cover, an upper cylinder body, a lower end cover, a primary carbon box and a secondary carbon box, wherein the upper cylinder body is communicated up and down; the quick sampling anchor clamps in this scheme are through adopting the upper end cover, go up the barrel, the lower barrel and the lower extreme cover constitute adjacent two between adopt threaded connection's structural style, will be used for the gaseous one-level carbon box of adsorption test and the corresponding installation of second grade carbon box under in barrel and lower extreme cover inner chamber, it can make the gas distribution that enters into in the carbon box more even of this kind of structural style's sampling anchor clamps, and the sampling representativeness is better.

Description

Quick sampling clamp for efficiency test of iodine adsorber

Technical Field

The invention relates to the technical field of radioactive gas sampling equipment in the nuclear field, in particular to a rapid sampling clamp for an efficiency test of an iodine adsorber.

Background

The radioactive iodine is one of main source items of radioactive waste gas generated in the operation process of the nuclear facility, and in order to prevent the radioactive iodine from entering the human living environment under the operation and accident working conditions, the nuclear facility generally adopts an iodine adsorber to purify the radioactive iodine in exhaust air, so that the iodine adsorber is a key device in a nuclear air purification system, and the reliability of the iodine adsorber has important significance for the safe operation of the nuclear facility. In order to ensure the safe and reliable operation of the nuclear air purification system, a field efficiency test needs to be carried out on a newly installed iodine adsorber before operation, and the field efficiency test needs to be carried out on the installed iodine adsorber periodically after the iodine adsorber is operated for a period of time.

The method for testing the efficiency of the iodine adsorber of the nuclear facility in China mainly adopts a Freon method and a radioactive methyl iodine method. The radioactive methyl iodine method mainly uses I-131 marked methyl iodine as tracer, and uses methyl iodine generator to inject it into tested ventilation system, and respectively uses samplers connected with sampling clamps to make sample collection at upstream and downstream of iodine adsorber, and the active carbon box for test is placed in the sampling clamps, and the radioactive gas in the air channel is adsorbed by sample collection box when it is passed through the sampling device, and after the sampling is completed, the gamma spectrometer is used to measure the activity of sample, and the adsorption efficiency of iodine adsorber to radioactive iodine can be calculated by comparing the activities of upstream and downstream active carbon boxes. The traditional sampling carbon clamp is made of stainless steel processing materials and is heavy; the compression mode adopts a single compression mode of threads after two-stage carbon box overlapping, and if the carbon box is not installed in place or the single tightening force is not enough, the sampling airflow short circuit is possibly caused, so that the sample collection and measurement result is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a rapid sampling clamp for an efficiency test of an iodine adsorber, which has a reasonable structural design, enables the distribution of a sampling gas in a sampling clamp to be more uniform and enables the sampling result to be more reasonable.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides an iodine adsorber efficiency test is with quick sampling anchor clamps, the sampling anchor clamps include upper end cover, the last barrel that link up from top to bottom, the lower barrel that link up from top to bottom, lower end cover, one-level charcoal box and second grade charcoal box, upper end cover and lower end cover are provided with air inlet and gas outlet on it respectively, wherein it links to each other to constitute the screw thread between the bottom of barrel and the lower end cover down, the upper end of barrel and last barrel bottom constitute the screw thread and link to each other down, it constitutes the screw thread with the upper end cover bottom and links to each other to go up the barrel upper end, one-level charcoal box horizontal installation be in the lower barrel inner chamber, second grade charcoal box horizontal installation be in.

Furthermore, the sampling clamp also comprises rubber sealing gaskets arranged on the upper end surface and the lower end surface of the first-stage carbon box and the second-stage carbon box.

Furthermore, a filter membrane is arranged between the upper end cover and the end face of the upper cylinder body.

Further, the sampling clamp further comprises a metal honeycomb net core arranged below the filter membrane, wherein the filter membrane is arranged on the upper end face of the metal honeycomb net core.

Further, the upper end cover, the upper cylinder body, the lower cylinder body and the lower end cover are made of aluminum alloy materials subjected to surface passivation treatment.

Furthermore, the outer walls of the upper end cover, the upper cylinder body, the lower cylinder body and the lower end cover are provided with a knurled line layer.

The scheme has the beneficial technical effects that: the quick sampling anchor clamps in this scheme are through adopting the upper end cover, go up the barrel, the lower barrel and the lower extreme cover constitute adjacent two between adopt threaded connection's structural style, will be used for the gaseous one-level carbon box of adsorption test and the corresponding installation of second grade carbon box under in barrel and lower extreme cover inner chamber, it can make the gas distribution that enters into in the carbon box more even of this kind of structural style's sampling anchor clamps, and the sampling representativeness is better.

Drawings

Fig. 1 is a schematic partial sectional view of a rapid sampling jig for efficiency test of an iodine adsorber in this embodiment.

In the figure:

1-upper end cover, 2-upper cylinder, 3-lower cylinder, 4-lower end cover, 5-first-stage carbon box, 6-second-stage carbon box, 7-filter membrane, 8-metal honeycomb net core, 9-air inlet, 10-air outlet.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

Referring to fig. 1, the rapid sampling fixture for the efficiency test of the iodine adsorber in the embodiment includes an upper end cover 1, an upper cylinder 2 penetrating up and down, a lower cylinder 3 penetrating up and down, a lower end cover 4, a primary carbon box 5, and a secondary carbon box 6, where the upper end cover 1 and the lower end cover 4 are respectively provided with an air inlet 9 and an air outlet 10, that is, the upper end cover 1, the upper cylinder 2, the lower cylinder 3, and the lower end cover 4 jointly form a shell structure of the sampling fixture, and a sampling gas enters from the air inlet 9 of the upper end cover 1, flows through inner cavities of the upper cylinder 2 and the lower cylinder 3, and then flows out through the air outlet 10 of the lower end cover 4. Wherein, the bottom of the lower barrel 3 is connected with the lower end cover 4 through internal and external threads, the upper end of the lower barrel 3 is connected with the bottom of the upper barrel 2 through internal and external threads, the upper end of the upper barrel 2 is connected with the bottom of the upper end cover 1 through internal and external threads, the primary carbon box 5 is horizontally arranged in the inner cavity of the lower barrel 3, and the secondary carbon box 6 is horizontally arranged in the inner cavity of the lower end cover 6.

In order to make the whole sampling clamp lighter, the upper end cover 1, the upper cylinder 2, the lower cylinder 3 and the lower end cover 4 in the embodiment are preferably made of aluminum alloy materials subjected to surface passivation treatment, and of course, other suitable materials can be selected in practice. In addition, in order to facilitate the operation and holding of the sampling clamp, the sampling clamp shell of the embodiment is also provided with a knurled layer.

In order to have excellent sealing effect, the rubber sealing gaskets are arranged on the upper end surface and the lower end surface of the first-stage carbon box 5 and the second-stage carbon box 6, namely the contact end surfaces of the carbon boxes and the lower barrel 3, the lower end cover 4 and the upper barrel 2 respectively, so that the entered test airflow is prevented from leaking outwards.

In order to prevent the accuracy of the test result from being affected by the impurity contained in the test gas flow entering the carbon box, a filter membrane 7 is further arranged between the upper end cover 1 and the upper cylinder 2, namely, the filter membrane 7 is positioned below the gas inlet 9 of the upper end cover 1 and is used for filtering the entering gas; in addition, this embodiment still sets up metal honeycomb net core 8 in this filter membrane 7 below ingeniously, and this metal honeycomb net core 8 horizontal installation is in last barrel 2 inner chamber, and the filtering is directly installed on the up end of this metal honeycomb net core 8, and on one hand it forms the support function to the filtering through metal honeycomb net core 8, prevents not blown by the air current in the in-process that the air current got into, and on the other hand it can also play and improve the air current function that gets into for the experimental testing result of air current is more accurate reasonable.

When in use, the parts are unscrewed and placed, the prepared secondary carbon box 6 is placed on an inner cavity support of the lower end cover 4, the lower barrel 3 and the lower end cover 4 are connected and screwed, the primary carbon box 5 is placed on the inner cavity support of the lower barrel 3, the upper barrel 2 and the lower barrel 3 are connected and screwed, and finally the filter membrane 7 is arranged on the upper surface of the metal honeycomb net core 8 of the upper barrel 2, and the upper end cover 1 is screwed; and connecting the combined sampling carbon clamp with a gas sampler, and then starting sampling operation.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. The utility model provides an experimental anchor clamps of sampling fast of using of iodine adsorber efficiency which characterized in that: the sampling fixture comprises an upper end cover, an upper barrel body which is communicated up and down, a lower end cover, a primary carbon box and a secondary carbon box, wherein an air inlet and an air outlet are respectively arranged on the upper end cover and the lower end cover, the bottom end of the lower barrel body is connected with the lower end cover in a threaded manner, the upper end of the lower barrel body is connected with the bottom end of the upper barrel body in a threaded manner, the upper end of the upper barrel body is connected with the bottom end of the upper end cover in a threaded manner, the primary carbon box is horizontally arranged in an inner cavity of the lower barrel body, and the secondary carbon box is horizontally arranged in.

2. The rapid sampling clamp for the efficiency test of the iodine adsorber according to claim 1, wherein: the sampling clamp further comprises rubber sealing gaskets arranged on the upper end face and the lower end face of the first-stage carbon box and the second-stage carbon box.

3. The rapid sampling clamp for the efficiency test of the iodine adsorber according to claim 1 or 2, wherein: and a filter membrane is also arranged between the upper end cover and the end face of the upper cylinder body.

4. The rapid sampling clamp for the efficiency test of the iodine adsorber according to claim 3, wherein: the sampling clamp further comprises a metal honeycomb net core arranged below the filter membrane, wherein the filter membrane is arranged on the upper end face of the metal honeycomb net core.

5. The rapid sampling clamp for the efficiency test of the iodine adsorber according to claim 1, wherein: the upper end cover, the upper cylinder body, the lower cylinder body and the lower end cover are made of aluminum alloy materials subjected to surface passivation treatment.

6. The rapid sampling clamp for the efficiency test of the iodine adsorption device according to claim 1 or 5, wherein: and the outer walls of the upper end cover, the upper cylinder body, the lower cylinder body and the lower end cover are provided with a knurled line layer.