CN218784726U

CN218784726U - Sample introduction drying device for mercury measurement

Info

Publication number: CN218784726U
Application number: CN202223125136.4U
Authority: CN
Inventors: 张辉
Original assignee: Institute of Geochemistry of CAS
Current assignee: Institute of Geochemistry of CAS
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-04-04
Anticipated expiration: 2032-11-23

Abstract

The utility model relates to a mercury measures technical field, especially relates to a advance a kind drying device for mercury is measured. The adsorption type pipe comprises a pipe body, cover bodies and mesh screens, wherein two ends of the pipe body are detachably connected with the two cover bodies respectively, one cover body is provided with an air inlet, the other cover body is provided with an air outlet, the two mesh screens are arranged in the pipe body respectively, an adsorption cavity is arranged between the two mesh screens, and a buffer cavity is arranged between the mesh screens and the cover bodies. The problem that desorption airflow from the mercury enrichment pipe uniformly and stably passes through the drying agent is solved by arranging the buffer chamber, and the removal efficiency and the service life of the drying device to water vapor and other impurities are improved.

Description

Sample introduction drying device for mercury measurement

Technical Field

The utility model relates to a mercury measures technical field, especially relates to a advance a kind drying device for mercury is measured.

Background

Mercury is a heavy metal substance that is liquid at normal temperature and pressure, and is widely distributed in media such as environmental water, solids, gases and the like. However, the concentration of mercury in natural environment is very low, usually in trace level (ppt or ppm), so it is very difficult to accurately measure the mercury concentration in environmental sample, and it is required that not only the mercury detector has high sensitivity, but also various impurities affecting the detector are removed in the purification, enrichment and thermal desorption processes of sample injection, especially water vapor generated in the thermal desorption process, which can lead to the passivation of the mercury enrichment tube, so that the mercury enrichment efficiency is reduced, so it is very important for drying the thermal desorption gas in the mercury analysis process.

At present, in the sample injection drying process of mercury measurement, a traditional drying device is mainly manufactured into a cavity with the inner diameter of 1-3 cm by adopting borosilicate glass, a borosilicate air inlet and an air outlet with the inner diameter of 0.5 cm (or 1/4 inch) are formed in two ends of the cavity, and soda lime drying agent is filled in the cavity. Airflow analyzed from the mercury enrichment pipe directly passes through the drying agent in the chamber through the air inlet, and after water vapor is adsorbed, the airflow passes through the air outlet and then is subjected to one-step enrichment and purification, or directly enters the mercury detector to analyze and measure the mass or the concentration of mercury. However, the desorption air flow from the mercury enrichment pipe directly passes through the drying agent in the cavity without a buffer space, so that the adsorption efficiency of water vapor is low in the process that the air flow rapidly passes through the cavity, and particularly, the higher the concentration of the water vapor of the desorption air is, the higher the speed of the air flow is, the longer the time for using the drying agent is, and the lower the removal efficiency of the drying device to the water vapor is; meanwhile, the inner diameter ratio of an air inlet and an air outlet of the traditional drying device is small, and the drying agent is inconvenient to fill; the air inlet and the air outlet are connected with an upstream pipeline and a downstream pipeline by adopting a silicone tube, the interface is easy to loosen, leak or hold back air, and the silicone tube is easy to damage after a long time; the borosilicate glass material is easy to be broken in the transportation or use process, etc.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model aims at providing a for abundant get rid of the steam of mercury analysis in-process thermal analysis gas and other impurity that influence mercury detector performance, prevent passivation in the mercury enrichment pipe short time, prolong the life's of mercury enrichment pipe problem.

(II) technical scheme

In order to solve the technical problem, the utility model provides a advance kind drying device for mercury is measured, including body, lid and mesh screen, the body both ends respectively with two the connection can be dismantled to the lid, one of them be provided with the air inlet on the lid, another be provided with the gas outlet on the lid, two the mesh screen sets up respectively in the body, two of them for adsorbing the cavity between the mesh screen, the mesh screen with be the buffering cavity between the lid.

Further, the pipe body is made of Teflon materials.

Further, the cover body is connected with the pipe body through threads.

Further, the aperture of the mesh screen is 0.1-0.5 mm.

Further, the air inlet and the air outlet are both provided with threaded joints.

Furthermore, the inner diameter of the adsorption chamber is 3-5 cm, and the length of the adsorption chamber is 5-10 cm.

Further, the inner diameter of the buffer chamber is 3-5 cm, and the length of the buffer chamber is 3-5 cm.

Furthermore, a drying agent is filled in the adsorption cavity.

(III) advantageous effects

The above technical scheme of the utility model have following advantage:

1. the problem that desorption airflow from the mercury enrichment pipe uniformly and stably passes through the drying agent is solved by arranging the buffer chamber, and the removal efficiency of the drying device on water vapor and other impurities is improved, and the service life of the drying device is prolonged;

2. the pipe body and the cover body are detachably connected, so that the drying agent is quickly filled, the drying agent replacement efficiency is improved, and the cleaning and purification are convenient;

3. adopt the special fluorine dragon material body, the absorption of maximum reduction body material to mercury avoids damaging, adopts threaded connection simultaneously, and convenient and special fluorine dragon union coupling has guaranteed the gas tightness.

Drawings

FIG. 1 is a schematic diagram of a sample injection drying device for mercury measurement;

in the figure: 1. a tube body; 2. a cover body; 3. a mesh screen; 4. an air inlet; 5. an air outlet; 6. an adsorption chamber; 7. a buffer chamber.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the utility model provides a advance a kind drying device for mercury is measured, including body 1, lid 2 and mesh screen 3, body 1 both ends respectively with two the connection can be dismantled to lid 2, one of them be provided with air inlet 4 on the lid 2, another be provided with gas outlet 5 on the lid 2, two the mesh screen 3 sets up respectively in the body 1, wherein two for adsorbing cavity 6 between the mesh screen 3, the mesh screen 3 with be buffering cavity 7 between the lid 2. The problem that desorption airflow from the mercury enrichment pipe uniformly and stably passes through the drying agent is solved by arranging the buffer chamber 7, and the removal efficiency and the service life of the drying device to water vapor and other impurities are improved.

During the use, the analytic gas that comes from mercury enrichment pipe gets into one of them buffering cavity 7 through air inlet 4 and cushions the back, gets into absorption cavity 6 through the mesh screen 3, through absorbing moisture and other impurity in the absorption cavity 6 after, gets into another buffering cavity 7 buffering through the mesh screen 3, then gets into downstream pipeline enrichment through gas outlet 5, or directly gets into mercury analysis (detector) and measures mercury quality or concentration.

In some embodiments, the tube body 1 is made of teflon, so that the mercury adsorption of the tube body 1 is reduced to the maximum extent, and meanwhile, the tube body is more durable than borosilicate glass materials, and damage in the transportation or use process is avoided. The tube body 1 may also be made of PTFE or PFA material.

In some embodiments, the cover 2 is screwed to the tube 1, and in use, the cover 2 is unscrewed from one end of the tube 1, the mesh 3 is removed, the adsorption chamber 6 is filled with a desiccant, the mesh 3 is replaced after the filling, and the cover 2 is screwed down. Can dismantle the connection through body 1 and lid 2, realize filling the drier fast, improve the drier and changed efficiency and convenient the washing and purifying.

In some embodiments, the mesh 3 has a pore size of 0.1 to 0.5 mm, which can effectively fix the desiccant and facilitate the gas circulation.

In some embodiments, the air inlet 4 and the air outlet 5 are provided with threaded joints, and can be connected with 1/4 inch Teflon pipes or glass pipes, so that air tightness is ensured.

In some embodiments, the inner diameter of the adsorption chamber 6 is 3-5 cm, and the length of the adsorption chamber 6 is 5-10 cm, which can be adjusted according to the measurement requirement.

In some embodiments, the inner diameter of the buffer chamber 7 is 3-5 cm, and the length of the buffer chamber 7 is 3-5 cm, which can be adjusted according to the measurement requirement.

In some embodiments, the adsorption chamber 6 is filled with a desiccant, which may be soda lime or other materials that can adsorb moisture but not mercury.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a advance a kind drying device for mercury is measured which characterized in that: the pipe comprises a pipe body, a cover body and mesh screens, wherein two ends of the pipe body are detachably connected with the cover body respectively, one end of the cover body is provided with an air inlet, the other end of the cover body is provided with an air outlet, the two mesh screens are arranged in the pipe body respectively, an adsorption cavity is arranged between the two mesh screens, and a buffer cavity is arranged between the mesh screens and the cover body.

2. The sample drying device for mercury measurement according to claim 1, characterized in that: the pipe body is made of Teflon materials.

3. The sample drying device for mercury measurement according to claim 1, characterized in that: the cover body is connected with the pipe body through threads.

4. The sample introduction drying device for mercury measurement according to claim 1, wherein: the aperture of the mesh screen is 0.1-0.5 mm.

5. The sample drying device for mercury measurement according to claim 1, characterized in that: the air inlet with the gas outlet all is provided with screwed joint.

6. The sample drying device for mercury measurement according to claim 1, characterized in that: the inner diameter of the adsorption chamber is 3-5 cm, and the length of the adsorption chamber is 5-10 cm.

7. The sample drying device for mercury measurement according to claim 1, characterized in that: the inner diameter of the buffer chamber is 3-5 cm, and the length of the buffer chamber is 3-5 cm.

8. The sample drying device for mercury measurement according to any one of claims 1 to 7, characterized in that: and a drying agent is filled in the adsorption cavity.