Gas sampling device

Abstract

The utility model discloses a gas sampling device. The gas sampling device comprises a gas pump, a filter, a primary packed column and a secondary packed column which are connected in sequence, wherein the first-stage packed column and the second-stage packed column are respectively connected with a liquid pump. The packed column in the gas sampling device greatly improves the mass transfer efficiency in the gas collection process, greatly improves the gas sampling flow, quickly increases the content of samples in absorption liquid, greatly reduces the sampling time, avoids the influence of environmental interference and absorption liquid decomposition on the detection result, realizes quick and accurate detection, and is simple in structure and convenient to operate. And the universality is good.

Description

Technical Field

[0001] This utility model relates to the technical field of gas composition analysis and detection equipment, specifically a gas sampling device. Background Technology

[0002] Some low-level components in ambient air or exhaust gas, such as inorganic fluorides like hydrogen fluoride and silicon tetrafluoride, as well as hydrogen chloride and hydrogen bromide, require rapid and accurate determination. GB3095-2012, "Ambient Air Quality Standard," stipulates that the maximum permissible concentration of hazardous substances in residential areas is 0.007 mg / m³ for fluoride per day on average. T36-76, "Hygienic Standard for Industrial Enterprise Design," stipulates that the maximum permissible concentration of hazardous substances in residential areas is 0.015 mg / m³ for hydrogen chloride per day on average. HJ688-201, "Determination of Hydrogen Fluoride in Exhaust Gas from Stationary Sources," sets the lower limit of detection at 0.32 mg / m³; HJ549-2016, "Determination of Hydrogen Chloride in Ambient Air and Exhaust Gas by Ion Chromatography," sets the lower limit of detection for ambient air at 0.080 mg / m³. Referring to the maximum permissible concentrations of fluoride and hydrogen chloride in residential areas, and following the above testing standards, the sampling time to reach the detection limit would require several hours. The concentrations of inorganic fluorides and hydrogen chloride in the atmosphere of actual residential areas are far below the maximum permissible concentrations, and sampling will take several days.

[0003] The Earth's environment contains abundant fluoride and chloride ions, which can easily interfere with various stages of the measurement process. Particularly when the fluoride and chloride ion content is low, the proportion of interference-induced measurements in the sample is significant, affecting the accuracy of the results. Furthermore, in some detection methods, the absorbent is unstable, and the longer the sampling time, the greater the error in the test results.

[0004] To address the aforementioned issues, improving the sampling efficiency of low-content components in ambient air and exhaust gas, and rapidly increasing the concentration of the sample in the absorption liquid, can effectively solve problems such as long sampling time and sample interference. Utility Model Content

[0005] To overcome the problems of low sampling efficiency, long sampling time, and easy interference with detection results in existing gas sampling devices, this utility model provides a gas sampling device that can improve detection accuracy and efficiency.

[0006] In one embodiment, a gas sampling device is disclosed, comprising: a gas pump, a filter, a primary packing column, and a secondary packing column connected in sequence; wherein the primary packing column and the secondary packing column are respectively connected to a liquid pump and the primary packing column and the secondary packing column are filled with an absorbent liquid.

[0007] In one embodiment, the filter includes an upper flange, a lower flange, an upper gasket, a lower gasket, a filter membrane, and fasteners, wherein the fasteners sequentially fasten the upper flange, the upper gasket, the filter membrane, the lower gasket, and the lower flange.

[0008] In one embodiment, the filter membrane is made of polytetrafluoroethylene, polypropylene, or quartz.

[0009] In one embodiment, the filter membrane formed of polytetrafluoroethylene or polypropylene has a pore size of <0.3 μm.

[0010] In one embodiment, the primary or secondary packing column includes a pipe, two fittings, packing material, and two packing fixing plates, wherein the pipe has two ends; the two fittings are respectively connected to the two ends of the pipe, the packing fixing plates are located at the two ends of the pipe, and the packing material is filled inside the pipe and located between the two packing fixing plates.

[0011] In one embodiment, the pipe is made of transparent PVC, and the fitting is also made of transparent PVC.

[0012] In one embodiment, the filler is made of glass, plastic, ceramic, or metal.

[0013] In one embodiment, the packing fixing plate has a porous structure.

[0014] In one embodiment, the filler fixing plate is made of plastic.

[0015] In one embodiment, the diameter of the hole in the packing fixing plate is greater than the inner diameter of the primary packing column or the secondary packing column, and the difference between the two does not exceed 1 mm.

[0016] The beneficial effects of this invention are that the packing column in the gas sampling device significantly improves the mass transfer efficiency during the gas sampling process, greatly increases the gas sampling flow rate, rapidly increases the content of the sample in the absorption liquid, and significantly reduces the sampling time. It also avoids environmental interference and absorption liquid decomposition from affecting the detection results, achieving rapid and accurate detection. The device has a simple structure and good versatility. Attached Figure Description

[0017] The features and advantages of this application will be more clearly understood by referring to the accompanying drawings, which are illustrative and should not be construed as limiting the application in any way. In the drawings:

[0018] Appendix Figure 1 This is a structural diagram of the device of this utility model;

[0019] Appendix Figure 2 This is a structural diagram of the filter of this utility model.

[0020] In the diagram: 1. Primary packing column, 2. Secondary packing column, 3. Packing, 4. Packing fixing plate, 5. Air pump, 6. First liquid pump, 7. Second liquid pump, 8. Gas flow meter, 9. Filter, 10. First liquid flow meter, 11. Second liquid flow meter, 12. Flange, 13. Sealing gasket, 14. Filter membrane, 15. Fastener. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to 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. The terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The connection method in this embodiment is a common chemical pipeline and fitting connection method, and the connecting pipe material is PVC or PU.

[0024] Method 1: Sample hydrogen chloride from ambient air.

[0025] like Figure 1 As shown, before sampling begins, the absorbent liquid, i.e., water, is added to the primary and secondary packing columns respectively. Ambient air is drawn in and pressurized by the air pump 5, and then enters from the bottom of the primary packing column 1 and exits from the top through the gas flow meter 8 and the filter 9, entering the bottom of the secondary packing column 2 and exiting from the top. The absorbent liquid is drawn from the top of the primary and secondary packing columns 1 and 2 and exits from the bottom through the first and second liquid pumps 6 and 7 and the first and second liquid flow meters 10 and 11 respectively, circulating for absorption.

[0026] See filter 9 Figure 2It consists of two flanges 12, two gaskets 13, a filter membrane 14, and fasteners 15. The fasteners sequentially secure the upper flange, upper gasket, filter membrane, lower gasket, and lower flange. The filter membrane is a quartz membrane. The two gaskets 13 are also called two shims.

[0027] The primary and secondary packing columns 1 and 2 are formed by bonding transparent PVC pipes and fittings, and from bottom to top are a reducing straight connector, a reducing tee, a pipe, a reducing tee, and a reducing straight connector.

[0028] A packing fixing plate 4 is placed at the top and bottom of the packing column, and the diameter of the packing fixing plate is 0.5mm larger than the inner diameter of the packing column. It is fixed inside the packing column by friction. The packing fixing plate has a porous structure and is made of PVC.

[0029] The glass packing material 3 is scattered between the packing fixing plates.

[0030] Method 2: Sample fluorides in exhaust gas.

[0031] Hydrogen fluoride in fluorides is highly reactive and readily reacts with glass and metal in sampling devices; therefore, the use of glass and metal materials in sampling devices should be avoided.

[0032] Before sampling begins, the absorbent, i.e., 30 mmol potassium hydroxide solution, is added to the primary and secondary packed columns respectively. The exhaust gas is drawn in and pressurized by the gas pump 5, and then enters from the bottom of the primary packed column 1 and exits from the top through the gas flow meter 8 and the filter 9, and enters from the bottom of the secondary packed column 2 and exits from the top. The absorbent is drawn in from the top of the primary and secondary packed columns 1 and 2 and exits from the bottom through the first and second liquid pumps 6 and 7 and the first and second liquid flow meters 10 and 11 respectively, and is absorbed in a cycle.

[0033] See filter 9 Figure 2 It consists of two flanges 12, two gaskets 13, a filter membrane 14, and fasteners 15. The fasteners sequentially fasten the upper flange, upper gasket, filter membrane, lower gasket, and lower flange. The filter membrane is a polytetrafluoroethylene membrane with a pore size of 0.22 μm.

[0034] The primary and secondary packing columns 1 and 2 are formed by bonding transparent PVC pipes and fittings, and from bottom to top are a reducing straight connector, a reducing tee, a pipe, a reducing tee, and a reducing straight connector.

[0035] A packing fixing plate 4 is placed at the top and bottom of the packing column, with the diameter of the fixing plate being 0.5mm larger than the inner diameter of the packing column. It is fixed inside the packing column by friction. The packing fixing plate has a porous structure and is made of PVC. PP packing material 3 is scattered between the packing fixing plates.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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 gas sampling device, characterized in that, include: An air pump, a filter, a primary packing column, and a secondary packing column are connected in sequence; wherein the primary packing column and the secondary packing column are each connected to a liquid pump and the primary and secondary packing columns are filled with absorbent liquid.

2. The gas sampling device according to claim 1, characterized in that, The filter includes an upper flange, a lower flange, an upper gasket, a lower gasket, a filter membrane, and fasteners, wherein the fasteners sequentially fasten the upper flange, the upper gasket, the filter membrane, the lower gasket, and the lower flange.

3. A gas sampling device according to claim 2, characterized in that, The filter membrane is made of polytetrafluoroethylene, polypropylene, or quartz.

4. A gas sampling device according to claim 3, characterized in that, The filter membrane formed of polytetrafluoroethylene or polypropylene has a pore size of <0.3 μm.

5. A gas sampling device according to claim 1, characterized in that, The primary or secondary packing column includes a pipe, two fittings, packing material, and two packing fixing plates. The pipe has two ends, the two fittings are respectively connected to the two ends of the pipe, the packing fixing plates are located at the two ends of the pipe, and the packing material is filled inside the pipe and located between the two packing fixing plates.

6. A gas sampling device according to claim 5, characterized in that, The pipe is made of transparent PVC, and the fittings are also made of transparent PVC.

7. A gas sampling device according to claim 5, characterized in that, The filler material can be glass, plastic, ceramic or metal.

8. A gas sampling device according to claim 5, characterized in that, The packing fixing plate has a porous structure.

9. A gas sampling device according to claim 5, characterized in that, The packing fixing plate is made of plastic.

10. A gas sampling device according to claim 8, characterized in that, The diameter of the hole in the packing fixing plate is greater than the inner diameter of the primary packing column or the secondary packing column, and the difference between the two does not exceed 1 mm.

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