Portable sampling device for measuring hydrogen sulfide

Abstract

The utility model belongs to the field of sampling of hydrogen sulfide, and particularly relates to a portable sampling device for measuring hydrogen sulfide, which comprises a gas absorption column, absorption liquid is arranged in the gas absorption column, one side of the gas absorption column is connected with a flow meter through a gas guide pipe, one end of the flow meter is provided with a gas inlet pipe, and one end of the gas inlet pipe is connected with a sampling port; an air inlet three-way valve and a steady flow three-way valve are respectively arranged on the air inlet pipe and the air guide pipe, and one end of the air inlet three-way valve and one end of the steady flow three-way valve are both used for emptying and exhausting. Due to the fact that the absorption liquid is the cadmium acetate-sodium chloride solution with the freezing point ranging from-10 DEG C to-20 DEG C, it is avoided that hydrogen sulfide gas in carbon dioxide exhaust gas is dissolved in condensed water, and consequently the determination result of the gas chromatography method is low, the gas absorption column is wrapped with the heat preservation layer, and sample collection in the alpine region is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of sampling of hydrogen sulfide, and particularly relates to a portable sampling device for the determination of hydrogen sulfide. Background Art

[0002] The removal of acidic gases carbon dioxide and hydrogen sulfide in coal gas mainly adopts the Rectisol process, but there will still be a small amount of hydrogen sulfide gas in the discharged carbon dioxide. Since hydrogen sulfide is a toxic gas, strict requirements are imposed on its emission index.

[0003] The main method for the determination of hydrogen sulfide in carbon dioxide emission gas is gas chromatography. However, since the temperature of the carbon dioxide emission gas is generally about 10°C and the gas contains a high content of water vapor, its sampling link is very important. Generally, a sampling bag is used to directly collect the gas sample and then taken to the laboratory for chromatographic analysis. During the above sampling process, hydrogen sulfide in the carbon dioxide gas will dissolve in the condensed water vapor, resulting in a low determination result of hydrogen sulfide, especially in winter. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides a portable sampling device for the determination of hydrogen sulfide, which can avoid the low determination result of gas chromatography caused by the dissolution of hydrogen sulfide gas in carbon dioxide emission gas in condensed water.

[0005] The technical solution of the utility model is as follows: A portable sampling device for the determination of hydrogen sulfide includes a gas absorption column. An absorption liquid is provided inside the gas absorption column. One side of the gas absorption column is connected to a flow meter through a gas guide pipe. One end of the flow meter is provided with an inlet pipe, and one end of the inlet pipe is connected to a sampling port.

[0006] Furthermore, an intake three-way valve and a flow-stabilizing three-way valve are respectively provided on the inlet pipe and the gas guide pipe. One end of each of the intake three-way valve and the flow-stabilizing three-way valve is used for venting and exhausting.

[0007] Furthermore, one end of the gas guide pipe is provided with a porous sand chip, and the porous sand chip is arranged below the interior of the gas absorption column.

[0008] Furthermore, a top screw cap is provided at the top of the gas absorption column. An air inlet and an exhaust port are respectively provided through the top screw cap. The air inlet is connected to the gas guide pipe; an exhaust pipe is connected to the exhaust port.

[0009] Furthermore, a bottom screw cap is provided at the bottom of the gas absorption column. A liquid discharge port is provided through the bottom screw cap. A liquid discharge pipe is connected to the liquid discharge port, and a liquid discharge valve is provided on the liquid discharge pipe.

[0010] Further, the gas absorption column is made of plexiglass, and the ratio of the height to the diameter of the gas absorption column is 2 to 5; the outside of the gas absorption column is coated with a heat-insulating layer with a thickness of 3 cm to 5 cm.

[0011] Further, the absorption liquid is a cadmium acetate-sodium chloride solution with a freezing point of -10°C to -20°C, and the filling height of the absorption liquid in the gas absorption column is 1 / 3 - 3 / 5 of the height of the gas absorption column.

[0012] Further, the intake three-way valve, the flowmeter, the steady-flow three-way valve and the gas absorption column are all arranged on the fixing plate.

[0013] The beneficial effects of the present utility model are as follows: The intake three-way valve, the flowmeter, the steady-flow three-way valve and the gas absorption column are installed and fixed through the fixing plate, making the sampling device compact in shape and easy to carry; the flow rate of the sample gas is adjusted through the intake three-way valve, and the flow rate of the sample gas is detected through the flowmeter. At this time, the steady-flow three-way valve discharges the sample gas entering the gas absorption column from the flowmeter. When the flowmeter detects the required flow rate of the sample gas, quickly adjust the steady-flow three-way valve to make the sample gas enter the gas absorption column, and start timing at the same time to determine the volume of the sample gas entering the gas absorption column; since the filling height of the absorption liquid in the gas absorption column is 1 / 3 - 3 / 5 of the height of the gas absorption column, the space above the liquid level of the absorption liquid inside the gas absorption column is relatively large, avoiding damage to the flowmeter caused by excessive gas pressure changes; the sample gas is evenly distributed in the absorption liquid through the porous sand chip, so that hydrogen sulfide in the sample gas can be completely absorbed by the absorption liquid; since the absorption liquid is a cadmium acetate-sodium chloride solution with a freezing point of -10°C to -20°C, it avoids the low determination result of gas chromatography caused by the dissolution of hydrogen sulfide gas in carbon dioxide emission gas in condensed water, and the outside of the gas absorption column is coated with a heat-insulating layer, ensuring the sample collection in alpine regions. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the working process of the present utility model. Detailed Embodiments

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "one end", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] During the sampling process of carbon dioxide emission gas, hydrogen sulfide in the carbon dioxide gas will dissolve in the condensed water vapor, resulting in a low measurement result of hydrogen sulfide. In view of this, the inventor of the present application provides a portable device for measuring hydrogen sulfide, which can avoid the low measurement result of gas chromatography caused by the dissolution of hydrogen sulfide gas in carbon dioxide emission gas in condensed water.

[0019] As Figure 1 shown, the portable sampling device for measuring hydrogen sulfide includes a gas absorption column 4. An absorption liquid is provided inside the gas absorption column 4. One side of the gas absorption column 4 is connected to a flow meter 2 through a conduit 3. One end of the flow meter 2 is provided with an intake pipe 1, and one end of the intake pipe 1 is connected to a sampling port.

[0020] Based on the above embodiments, the flow meter 2 and the gas absorption column 4 are connected through a guiding pipe 3 to form an integrated device for rapid sampling.

[0021] Among them, an intake three-way valve 5 and a flow-stabilizing three-way valve 6 are respectively provided on the intake pipe 1 and the conduit 3. One end of the intake three-way valve 5 and the flow-stabilizing three-way valve 6 is used for venting and exhausting.

[0022] Based on the above embodiments, after the intake pipe 1 starts to communicate with the sampling port, the flow rate of the sample gas is adjusted by the intake three-way valve 5, and the flow rate of the sample gas is detected by the flow meter 2. At the same time, the sample gas entering the gas absorption column 4 from the flow meter 2 is discharged through the steady flow three-way valve 6. After the flow rate of the flow meter 2 is stable, the steady flow three-way valve 6 is quickly adjusted to connect the gas absorption column 4 to the flow meter 2 through the guide pipe 3, so that the sample gas enters the gas absorption column 4.

[0023] In this embodiment, one end of the guide pipe 3 is provided with a porous sand chip 13, and the porous sand chip 13 is arranged below the inside of the gas absorption column 4;

[0024] Among them, the top of the gas absorption column 4 is provided with a top screw cap 7. The top screw cap 7 is provided with an air inlet and an exhaust port. The air inlet is connected to the guide pipe 3; the exhaust port is connected to an exhaust pipe 8;

[0025] The bottom of the gas absorption column 4 is provided with a bottom screw cap 9. The bottom screw cap 9 is provided with a liquid discharge port. The liquid discharge port is connected to a liquid discharge pipe 10, and a liquid discharge valve 11 is provided on the liquid discharge pipe 10.

[0026] Based on the above embodiments, after the top screw cap 7 is opened, the absorption liquid is poured into the gas absorption column 4, and the top screw cap 7 is closed; when the sample gas enters the gas absorption column 4, the sample gas is evenly distributed in the absorption liquid through the porous sand chip 13. Hydrogen sulfide in the sample gas reacts with the absorption liquid, and other gases in the sample gas are discharged through the exhaust pipe 8.

[0027] In this embodiment, the gas absorption column 4 is an organic glass column, and the ratio of the height to the diameter of the gas absorption column 4 is 2 to 5; a heat preservation layer 12 with a thickness of 3 cm to 5 cm is coated on the outside of the gas absorption column 4.

[0028] Among them, the absorption liquid is a cadmium acetate-sodium chloride solution with a freezing point of -10°C to -20°C, and the filling height of the absorption liquid in the gas absorption column 4 is 1 / 3 - 3 / 5 of the height of the gas absorption column 4.

[0029] Based on the above embodiments, since the outside of the gas absorption column 4 is coated with a heat preservation layer 12 and the absorption liquid is a cadmium acetate-sodium chloride solution resistant to -20°C, it ensures the collection of gas samples in alpine regions. After hydrogen sulfide in the sample gas reacts with the absorption liquid, the content of hydrogen sulfide is detected by spectrophotometry or titration using its reaction products; at the same time, since the space above the liquid surface of the absorption liquid inside the gas absorption column 4 is relatively large, it can avoid damage to the flow meter 2 caused by gas pressure changes.

[0030] In this embodiment, the intake three-way valve 5, the flow meter 2, the steady flow three-way valve 6, and the gas absorption column 4 are all arranged on the fixing plate 14.

[0031] Based on the above embodiments, since the intake three-way valve 5, the flow meter 2, the flow-stabilizing three-way valve 6, and the gas absorption column 4 are all arranged on the fixed plate 14, it is convenient to carry.

[0032] The working principle of the present utility model is as follows: First, place the absorption liquid in the gas absorption column 4, rotate the intake three-way valve 5 to connect the intake pipe 1 with the sampling port, and at the same time adjust the flow rate of the sample gas through the intake three-way valve 5, and detect the flow rate of the sample gas through the flow meter 2. At this time, the flow-stabilizing three-way valve 6 discharges the sample gas entering the gas absorption column 4 from the flow meter 2. When the flow meter 2 detects the required flow rate of the sample gas, quickly adjust the flow-stabilizing three-way valve 6 to make the sample gas enter the gas absorption column 4, and at the same time start timing to determine the volume of the sample gas entering the gas absorption column 4. The sample gas is evenly distributed in the absorption liquid through the porous sand chip 13, and hydrogen sulfide in the sample gas reacts with the absorption liquid, and other gases are discharged through the exhaust pipe 8; the content of hydrogen sulfide is detected by spectrophotometry or titration method, and then the liquid in the gas absorption column 4 is emptied through the drain pipe 10 and the drain valve 11.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitutions on some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A portable sampling device for hydrogen sulfide determination, characterized in that, It includes a gas absorption column, an absorption liquid is provided inside the gas absorption column, one side of the gas absorption column is connected to a flowmeter through a gas guide pipe, one end of the flowmeter is provided with an intake pipe, and one end of the intake pipe is connected to a sampling port; An intake three-way valve and a flow-stabilizing three-way valve are respectively provided on the intake pipe and the gas guide pipe, and one end of each of the intake three-way valve and the flow-stabilizing three-way valve is used for venting and exhausting; One end of the gas guide pipe is provided with a porous sand chip, and the porous sand chip is arranged below the interior of the gas absorption column; The top of the gas absorption column is provided with a top screw cap, an intake port and an exhaust port are penetrated through the top screw cap, the intake port is connected to the gas guide pipe; a exhaust pipe is connected to the exhaust port; The bottom of the gas absorption column is provided with a bottom screw cap, a liquid discharge port is penetrated through the bottom screw cap, a liquid discharge pipe is connected to the liquid discharge port, and a liquid discharge valve is provided on the liquid discharge pipe; The gas absorption column is an organic glass column, and the ratio of the height to the diameter of the gas absorption column is 2 to 5; a heat insulation layer of 3 cm to 5 cm is coated outside the gas absorption column; The filling height of the absorption liquid in the gas absorption column is 1 / 3 - 3 / 5 of the height of the gas absorption column.

2. The portable sampling device for hydrogen sulfide determination according to claim 1, characterized in that, The intake three-way valve, the flowmeter, the flow-stabilizing three-way valve and the gas absorption column are all arranged on a fixing plate.

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