Mercury capture tube for gaseous mercury measurement analysis

Abstract

The utility model provides a kind of mercury trapping pipe for gaseous mercury measurement and analysis, including first capture pipe and second capture pipe;First capture pipe has first inlet end and first outlet end, first capture pipe inner layer is provided with quartz fiber filter membrane layer and first quartz sand core layer, and quartz fiber filter membrane layer is arranged in the side of first quartz sand core layer close to first inlet end;Second capture pipe has second inlet end and second outlet end, and second capture pipe is equipped with mercury enrichment medium layer, and the both ends of mercury enrichment medium layer are equipped with second quartz sand core layer respectively, and second outlet end is used to be connected with suction pump;Wherein, the pipe diameter of first capture pipe is greater than the pipe diameter of second capture pipe.The utility model can collect gaseous elemental mercury, gaseous oxidized mercury and particulate mercury in gas into mercury enrichment pipe, thereby solve the problem that part of particulate mercury in gas cannot be captured and measured, realize the effective and accurate collection and measurement of gaseous total mercury.

Description

Technical Field

[0001] This utility model relates to the field of mercury measurement technology, and more specifically, to a mercury collection tube for measuring and analyzing gaseous mercury. Background Technology

[0002] Mercury is a toxic and harmful heavy metal element that is liquid at room temperature and pressure, capable of volatilizing into the air. It then diffuses and is transported with gaseous flows, entering the earth's surface and water bodies through atmospheric deposition, leading to environmental pollution. Therefore, accurate measurement of gaseous mercury concentration is crucial for studying and assessing airborne mercury pollution and its sources. Furthermore, the sources of gaseous mercury are complex and widespread. Besides natural sources such as earthquakes, volcanoes, and soil volatilization, there are also anthropogenic emissions from fossil fuel combustion, oil and gas extraction, and waste incineration. The amount of mercury emitted from these sources also needs to be assessed through accurate measurement of gaseous mercury. However, current methods for measuring gaseous mercury simply involve filtering particulate matter from the gas, collecting the mercury in the gas through a mercury enrichment tube, and then heating and desorbing it into a mercury detector for concentration analysis. This technique results in a large amount of mercury adsorbed by airborne particles or aerosols being trapped and unable to be captured by the mercury enrichment tube, leading to inaccurate measurements of the total gaseous mercury concentration. In order to accurately measure the concentration of total gaseous mercury, it is urgent to develop a new type of gaseous mercury collection device. Utility Model Content

[0003] (a) Technical problems to be solved The technical problem this invention aims to solve is that the existing technology is not accurate enough in measuring the total concentration of gaseous mercury.

[0004] (II) Technical Solution To achieve the above objectives, the technical solution adopted by this utility model is as follows: This invention provides a mercury collection tube for measuring and analyzing gaseous mercury, comprising a first collection tube and a second collection tube. The first collection tube has a first inlet end and a first outlet end, and a quartz fiber filter membrane layer and a first quartz sand core layer are stacked inside the first collection tube, with the quartz fiber filter membrane layer disposed on the side of the first quartz sand core layer near the first inlet end. The second collection tube has a second inlet end and a second outlet end, and a mercury enrichment medium layer is disposed inside the second collection tube, with second quartz sand core layers disposed at both ends of the mercury enrichment medium layer. The second outlet end is used to connect to a vacuum pump. The diameter of the first collection tube is larger than the diameter of the second collection tube. This technical solution achieves staged collection of gaseous mercury; the first collection tube filters particulate matter, while the second collection tube specifically collects gaseous mercury, thereby improving measurement accuracy and avoiding errors caused by particulate matter interference.

[0005] Preferably, the system also includes a pipe screw cap, which is connected to the first inlet end. The above technical solution provides a standardized connection interface, facilitating quick connection with the sampling pipeline, enhancing sealing, reducing gas leakage, and simplifying on-site operations.

[0006] Preferably, the distance between the first quartz sand core layer and the end face of the pipe screw cap is 30cm. The above technical solution optimizes the gas pretreatment path, ensuring sufficient diffusion of the gas before it enters the quartz fiber filter membrane layer, improving filtration efficiency, and reducing airflow resistance.

[0007] Preferably, the pipe screw cap has an internal thread. The above technical solution achieves compatible connection with general-purpose pipes (such as the GL32 type), improves equipment interchangeability and installation efficiency, and is suitable for various sampling scenarios.

[0008] Preferably, the mercury enrichment medium layer comprises at least one of pure gold particles, gold-plated quartz particles, and activated carbon. The above technical solution provides a highly efficient mercury adsorption option; pure gold and gold-plated particles exhibit high selectivity for mercury, while activated carbon is low-cost and has a large adsorption capacity. Users can flexibly choose according to their needs, enhancing applicability.

[0009] Preferably, the inner diameter of the first capture tube is 3 cm and the length is 50 cm. The above technical solution ensures sufficient gas processing capacity, suitable for high-flow-rate sampling, while the length design avoids excessive pressure drop and maintains sampling efficiency.

[0010] Preferably, the inner diameter of the second capturing tube is 1 cm and the length is 30 cm. This technical solution, in combination with the first capturing tube, achieves optimal results: the smaller diameter increases the airflow velocity to enhance mercury capture kinetics, while the appropriate length ensures sufficient contact time and improves enrichment efficiency.

[0011] Preferably, both the first and second trapping tubes are made of quartz. This technical solution utilizes the chemical stability and high-temperature resistance of quartz to avoid measurement deviations caused by mercury adsorption or reaction, and is particularly suitable for thermal desorption analysis processes.

[0012] Preferably, the distance between the second quartz sand layer and the end face of the second inlet is 10 cm. This technical solution ensures that the mercury enrichment medium layer is in the optimal position, allowing gas to pass through the medium layer uniformly, thus improving the uniformity and reliability of the capture.

[0013] Preferably, the length of the mercury enrichment medium layer is 2 cm. The above technical solution balances adsorption capacity and airflow resistance. Too short a length may reduce the capture amount, while too long a length will increase the pressure drop. The 2 cm length has been experimentally verified to maximize efficiency.

[0014] (III) Beneficial Effects The above-mentioned technical solution of this utility model has at least the following advantages: This invention achieves staged collection of gaseous mercury. The first collection tube filters particulate matter, while the second collection tube specifically collects gaseous mercury. Particulate mercury is enriched on the quartz fiber filter membrane layer of the first-stage collection tube, while the remaining gaseous mercury is enriched on the mercury enrichment medium of the second-stage collection tube, thus achieving complete collection of all total gaseous mercury. It can capture all mercury in the gas (including gaseous elemental mercury, gaseous mercuric oxide, and particulate mercury) into the mercury enrichment tube, thereby solving the problem of the inability to capture and measure some particulate mercury in the gas, and realizing the effective and accurate collection and measurement of total gaseous mercury. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a mercury trapping tube for measuring and analyzing gaseous mercury provided in an embodiment of this utility model.

[0017] The labels for the attached figures are as follows: 1. First capture tube; 2. Second capture tube; 3. Pipeline screw cap; 11. First inlet end; 12. First outlet end; 13. Quartz fiber filter membrane layer; 14. First quartz sand core layer; 21. Second inlet end; 22. Second outlet end; 23. Mercury enrichment medium layer; 24. Second quartz sand core layer. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly on or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or the number of technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. The specific implementation of this utility model is described in more detail below with reference to specific embodiments: like Figure 1 As shown, this utility model embodiment provides a mercury trapping tube for measuring and analyzing gaseous mercury, including a first trapping tube 1 and a second trapping tube 2; the first trapping tube 1 has a first inlet end 11 and a first outlet end 12, and a quartz fiber filter membrane layer 13 and a first quartz sand core layer 14 are stacked inside the first trapping tube 1, with the quartz fiber filter membrane layer 13 disposed on the side of the first quartz sand core layer 14 near the first inlet end 11; the second trapping tube 2 has a second inlet end 21 and a second outlet end 22, and a mercury enrichment medium layer 23 is disposed inside the second trapping tube 2, with second quartz sand core layers 24 respectively disposed at both ends of the mercury enrichment medium layer 23, and the second outlet end 22 is used to connect to a vacuum pump; wherein, the diameter of the first trapping tube 1 is larger than the diameter of the second trapping tube 2.

[0022] As one of the optional embodiments of this example, it also includes a pipe screw cap 3, which is connected to the first inlet end 11.

[0023] As one of the optional implementation methods of this embodiment, the distance between the first quartz sand core layer 14 and the end face of the pipe screw cap 3 is 30cm.

[0024] As one of the optional embodiments of this example, the pipe screw cap 3 is provided with internal threads.

[0025] As one of the optional embodiments of this example, the mercury enrichment medium layer 23 includes at least one of pure gold particles, gold-plated quartz particles, and activated carbon.

[0026] As one of the optional implementation methods of this embodiment, the inner diameter of the first capturing tube 1 is 3cm and the length is 50cm.

[0027] As one of the optional implementations of this embodiment, the inner diameter of the second capturing tube 2 is 1cm and the length is 30cm.

[0028] As one of the optional implementations of this embodiment, the materials of the first capturing tube 1 and the second capturing tube 2 are both quartz materials.

[0029] As one of the optional implementations of this embodiment, the distance between the second quartz sand layer 14 and the end face of the second inlet end 21 is 10cm.

[0030] As one of the optional embodiments of this example, the length of the mercury enrichment medium layer 23 is 2 cm.

[0031] like Figure 1 As shown, the entire collection tube is made of quartz material in one piece, and is divided into a first collection tube 1 (coarse tube) and a second collection tube 2 (fine tube). The first collection tube 1 is 50 cm long and has an inner diameter of 3 cm. The first inlet end 11 is threaded, which can be screwed onto a GL32 type pipe screw cap 3 to facilitate gas entering the first collection tube 1 through the pipe. A first quartz sand core layer 14 is provided 30 cm away from the threaded opening of the pipe screw cap 3 in the first collection tube 1. The micropores of the first quartz sand core layer 14 allow gas to pass through. A quartz fiber filter membrane layer 13 is placed on the air inlet side of the first quartz sand core layer 14, which can trap particulate matter and aerosols in the gas. Then the gas enters the second collection tube 2 after passing through the first quartz sand core layer 14. The second capture tube 2 is 30 cm long and has an inner diameter of 1 cm. Two second quartz sand layers 14 are provided 10 cm away from the connection with the first capture tube 1. The space between the two second quartz sand layers 14 is filled with a mercury enrichment medium layer 23 (pure gold particles, gold-plated quartz particles, activated carbon and other mercury adsorbents), which is 2 cm long. After the gas passing through the first capture tube 1 passes through the second quartz sand layer 14 and the mercury enrichment medium layer 23 between them, all the mercury in the gas will be captured by the mercury enrichment medium.

[0032] When collecting gaseous mercury using the mercury trapping tube provided in this embodiment, simply connect a 1 / 4-inch Teflon tube to the second outlet 22, then connect the Teflon tube to the vacuum pump, and start the vacuum pump at a certain flow rate for sampling. During the sampling process, particulate mercury in the gas is enriched on the quartz fiber filter membrane layer 13 of the first-stage trapping tube 1, while the remaining gaseous mercury is enriched on the mercury enrichment medium 23 of the second-stage trapping tube 2, thus achieving complete capture of all gaseous mercury. After a certain period of gaseous mercury capture, the particulate mercury on the quartz fiber filter membrane layer 13 in the first-stage trapping tube 1 and the mercury enrichment medium 23 in the second-stage trapping tube 2 can be pyrolyzed at high temperature into gaseous elemental mercury. This gaseous mercury content is then carried into the mercury detector by a carrier gas, allowing for accurate measurement and analysis of the true mercury concentration of the gas being tested based on the sampling flow rate and time.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mercury trapping tube for measuring and analyzing gaseous mercury, characterized in that, include: The first capture tube has a first inlet end and a first outlet end. A quartz fiber filter membrane layer and a first quartz sand core layer are stacked inside the first capture tube. The quartz fiber filter membrane layer is disposed on the side of the first quartz sand core layer near the first inlet end. The second capture tube has a second inlet end and a second outlet end. The second capture tube is provided with a mercury enrichment medium layer. The two ends of the mercury enrichment medium layer are respectively provided with a second quartz sand core layer. The second outlet end is used to connect to a vacuum pump. The diameter of the first capturing tube is larger than the diameter of the second capturing tube.

2. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, It also includes a pipe screw cap, which is connected to the first inlet end.

3. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 2, characterized in that, The distance between the first quartz sand core layer and the end face of the pipe screw cap is 30cm.

4. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 2, characterized in that, The pipe screw cap is provided with internal threads.

5. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, The mercury enrichment medium layer includes at least one of pure gold particles, gold-plated quartz particles, and activated carbon.

6. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, The first capture tube has an inner diameter of 3cm and a length of 50cm.

7. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, The second capture tube has an inner diameter of 1 cm and a length of 30 cm.

8. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, Both the first and second capture tubes are made of quartz.

9. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, The distance between the second quartz sand layer and the end face of the second inlet is 10cm.

10. The mercury trapping tube for measuring and analyzing gaseous mercury as described in claim 1, characterized in that, The length of the mercury enrichment medium layer is 2 cm.

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