Dissolvable gas aqueous solution standard sample preparation and concentration detection device

Abstract

The utility model relates to a dissolved gas aqueous solution standard sample preparation and concentration detection device, which comprises an aeration tank, a measurement tank, a water storage tank, a standard gas inlet, a standard gas outlet, a main water inlet and a main water outlet, a sensor for measuring the concentration of gas-dissolved water in the measuring tank is arranged on the measuring tank, the standard gas inlet is respectively communicated with the aeration tank and the water storage tank through a three-way ball valve I, and the main water outlet is respectively communicated with the measuring tank and the water storage tank through a three-way ball valve II; the measuring tank and the water storage tank are communicated with the standard gas outlet through a three-way ball valve III; the device is mainly suitable for laboratories and instrument and meter calibration scenes, solves the problem of quickly preparing gas-dissolved water with different standard concentrations, is convenient to measure, has the advantages of simple structure, convenience in operation and high practicability, and is suitable for large-scale popularization and application. Meanwhile, the device is light and small in occupied space, and pressurization drainage equipment is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of dissolved gas water preparation, and more particularly to a device for preparing a standard sample of an aqueous solution of dissolved gas and detecting its concentration. Background Art

[0002] Dissolved gas water refers to an aqueous solution of dissolved gas, such as dissolved hydrogen, dissolved oxygen, ozone water, etc. When testing the performance of a dissolved gas water quality analyzer, standard dissolved gas water with different concentrations is required to calibrate the instrument and detect the basic error and accuracy of the instrument. Currently, standard dissolved gas water cannot be purchased on the market and can only be prepared on-site. The traditional method for preparing dissolved gas water is to first pressurize the gas and then introduce the pressurized gas into water for aeration to obtain dissolved gas water. During the preparation process, the concentration of the prepared dissolved gas water is controlled by controlling the gas pressure, flow rate, and aeration time.

[0003] The dissolved gas water prepared by the traditional method has a large output and a long preparation time, and is suitable for industrial application scenarios with a large demand for dissolved gas water of a single concentration. However, in the process of calibrating and detecting laboratory and instrumentation, the demand for dissolved gas water is small, but a large number of concentration gradients are required, and rapid preparation is needed. The preparation of dissolved gas water is no longer applicable in laboratory scenarios, and the pressurization equipment is bulky and inconvenient. Due to the limitations of instrument calibration and detection and laboratory environment, large-scale dissolved gas water preparation devices are not suitable for laboratory scenarios. Moreover, when preparing standard samples of dissolved gas water (such as dissolved oxygen, dissolved hydrogen, etc.), since the gas is very easy to precipitate from the water and the preparation process is difficult to control, the concentration of the prepared standard sample is inaccurate and inconvenient to measure.

[0004] Therefore, how to quickly dissolve a certain concentration of gas in water to reach a saturated state, obtain saturated dissolved gas water, facilitate the measurement of the concentration of this aqueous solution, and achieve the rapid preparation of standard samples of dissolved gas water is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] In view of this, the present invention provides a device for preparing a standard sample of an aqueous solution of dissolved gas and detecting its concentration, which is applicable to laboratory and instrumentation calibration scenarios. Under the condition of small demand for dissolved gas water, it solves the problem of rapidly preparing standard dissolved gas water with different concentrations, is convenient for measurement, and at the same time, the device of the present invention is light and occupies little space, and does not require pressurization and drainage equipment.

[0006] The device for preparing a standard sample of an aqueous solution of dissolved gas and detecting its concentration provided by the present invention adopts the following technical solutions:

[0007] A device for preparing a standard sample of an aqueous solution of dissolved gas and detecting its concentration includes an aeration tank, a measurement tank, a water storage tank, a standard gas inlet, a standard gas outlet, a main water inlet, and a main drain outlet;

[0008] The main water inlet communicates with the aeration tank, which is used for aeration and storing dissolved air water. A sensor is provided on the measurement tank, and the sensor is used to measure the concentration of dissolved air water in the measurement tank. The water storage tank is used for temporarily storing the converted flow direction of the dissolved air water;

[0009] The standard gas inlet communicates with the aeration tank and the water storage tank respectively through a three-way ball valve I, and the main drain outlet communicates with the measurement tank and the water storage tank respectively through a three-way ball valve II;

[0010] The measurement tank and the water storage tank communicate with the standard gas outlet through a three-way ball valve III;

[0011] A three-way ball valve IV is provided between the aeration tank and the measurement tank, and a three-way ball valve V is provided between the three-way ball valve IV and the water storage tank.

[0012] Optionally, a pressure stabilizing and unloading valve is provided between the standard gas outlet and the aeration tank and the water storage tank, and the pressure stabilizing and unloading valve is preset with a pressure threshold.

[0013] Optionally, a three-way ball valve VII is provided between the pressure stabilizing and unloading valve and the three-way ball valve III. Two of the three ends of the three-way ball valve VII communicate with the pressure stabilizing and unloading valve and the three-way ball valve III, and the remaining end is connected with a gas check valve I. The gas check valve I communicates with the main exhaust port, and a gas check valve II is provided between the pressure stabilizing and unloading valve and the main exhaust port.

[0014] Optionally, there are three measurement tanks. A four-way ball valve I is provided between the three-way ball valve IV and the water inlet end of the measurement tank, and a four-way ball valve II is provided between the water outlet end of the measurement tank and the three-way ball valve II.

[0015] Optionally, a valve II is provided between the measurement tank and the four-way ball valve I, and a liquid pressure gauge is provided between the four-way ball valve I and the three-way ball valve II.

[0016] Optionally, a valve I and a liquid check valve I are provided between the water storage tank and the main drain outlet, and a liquid check valve II is provided between the three-way ball valve II and the main drain outlet.

[0017] Optionally, a valve I and a liquid level gauge I are provided between the main water inlet and the aeration tank, and a liquid level gauge II is provided between the water storage tank and the three-way ball valve III.

[0018] Optionally, a gas flow meter is provided between the standard gas inlet and the three-way ball valve I, a gas pressure gauge is provided between the three-way ball valve III and the three-way ball valve VII, and a liquid flow meter and a liquid flow control valve are provided between the three-way ball valve IV and the measurement tank.

[0019] Optionally, a three-way ball valve VI is provided between the three-way ball valve II, the aeration tank and the three-way ball valve V.

[0020] Optionally, an aeration disc is provided at the bottom of the aeration tank. The aeration disc is placed in the middle of the aeration tank and has multiple layers of steel meshes with pore sizes increasing from small to large.

[0021] In summary, the present invention includes at least one of the following beneficial technical effects: The device of the present invention is mainly applicable to laboratory and instrument calibration scenarios. Under the condition of small demand for dissolved air water, it solves the problem of quickly preparing dissolved air water with different standard concentrations and is convenient for measurement. At the same time, the device of the present invention is light and occupies little space, and does not require pressurized drainage equipment. Under certain conditions, a certain concentration of gas is quickly dissolved in water to reach a saturated state to obtain saturated dissolved air water, and it is convenient to measure the concentration of this aqueous solution. To achieve the purpose of quickly preparing a standard sample of dissolved air water, the device of the present invention is small in volume and light in weight, and is mainly used in some scenarios with small demand for dissolved air water and requiring quick preparation, such as laboratory and instrument calibration and detection. Description of the Drawings

[0022] Figure 1 is a flow diagram of an embodiment of the present invention;

[0023] Figure 2 is a partial cross-sectional view of the aeration tank of an embodiment of the present invention.

[0024] Description of the reference numerals: 1, standard gas inlet; 2, main water inlet; 3, main drain; 4, standard gas exhaust port; 5, gas flow meter; 6, level gauge 1; 7, liquid flow meter; 8, level gauge 2; 9, gas pressure gauge; 10, liquid pressure gauge; 11, liquid check valve 2; 12, three-way ball valve 2; 13, three-way ball valve 6; 14, three-way ball valve 1; 15, liquid check valve 1; 16, valve 1; 17, three-way ball valve 5; 18, three-way ball valve 4; 19, valve; 20, liquid flow control valve; 21, three-way ball valve 3; 22, three-way ball valve 7; 23, gas check valve 1; 24, pressure stabilizing unloading valve; 25, gas check valve 2; 26, four-way ball valve 1; 27, four-way ball valve 2; 28, valve 3; 29, aeration tank; 30, water storage tank; 31, measurement tank; 32, aeration disc. Detailed Embodiments

[0025] The following is a further detailed description of the present invention with reference to the Figure 1-2 drawings.

[0026] An embodiment of the present invention discloses a device for preparing and detecting the concentration of a standard sample of a dissolved gas aqueous solution.

[0027] Refer to Figure 1 and Figure 2, An apparatus for preparing a standard sample of an aqueous solution of a soluble gas and detecting its concentration includes an aeration tank 29, a measurement tank 31, a water storage tank 30, a standard gas inlet 1, a standard gas outlet, a main water inlet 2, and a main drain 3. The main water inlet 2 communicates with the aeration tank 29. The aeration tank 29 is used for aeration and storing dissolved gas water. A sensor is provided on the measurement tank 31, and the sensor is used to measure the concentration of the dissolved gas water in the measurement tank 31. The water storage tank 30 is used for temporarily storing the dissolved gas water to change the flow direction; the standard gas inlet 1 communicates with the aeration tank 29 and the water storage tank 30 respectively through a three-way ball valve 14, and the main drain 3 communicates with the measurement tank 31 and the water storage tank 30 respectively through a three-way ball valve 12; the measurement tank 31 and the water storage tank 30 communicate with the standard gas outlet through a three-way ball valve 21; a three-way ball valve 18 is provided between the aeration tank 29 and the measurement tank 31, and a three-way ball valve 17 is provided between the three-way ball valve 18 and the water storage tank 30. The present invention is mainly applicable to laboratory and instrument calibration scenarios, especially under the condition of a small demand for dissolved gas water, to solve the problem of quickly preparing standard-concentration dissolved gas water with different concentrations and facilitate measurement. At the same time, the device of the present invention is light and occupies little space, and does not require pressurized drainage equipment.

[0028] In this embodiment, the main functions of the aeration tank 29 are to carry out aeration and store dissolved gas water. The aeration tank 29 is made of thickened 304 stainless steel, which is resistant to high pressure, corrosion-resistant, and does not react with the dissolved gas water. In order to quickly dissolve the standard gas in water, there is a special aeration disk 32 at the bottom of the aeration tank 29. The aeration disk 32 is placed in the middle position of the aeration tank 29. The aeration disk 32 is formed by stacking and welding multiple layers of steel meshes with gradually increasing pore sizes from small to large. This structure can cut a whole stream of air entering through the pipeline into countless small bubbles after passing through layer after layer of steel meshes with different pore sizes, allowing the gas to fully contact the water and quickly dissolve in the water, improving the aeration efficiency.

[0029] In this embodiment, during the process of measuring the concentration of the dissolved gas water, the dissolved gas water flows from the aeration tank 29, through the measurement tank 31 and then to the water storage tank 30 for storage. Through the commutation control of the opening and closing of each valve 19, the dissolved gas water flows from the water storage tank 30, through the measurement tank 31 and back to the aeration tank 29. The water storage tank 30 mainly serves as a temporary storage for changing the flow direction of the dissolved gas water during the whole process.

[0030] The measurement tank 31 is used to install a sensor to measure the concentration of the dissolved gas water. The water outlet is located in the middle part of the measurement tank 31, so that the dissolved gas water flows through the sensor probe after passing through the water inlet and then flows out of the measurement tank 31. This structure enables the sensor probe to fully contact the dissolved gas water, making the measurement result more accurate. Therefore, the flow direction of the dissolved gas water flowing in and out of the flow-through cell is fixed.

[0031] In this embodiment, three measurement cells 31 are provided. To effectively avoid differences in the pressure flowing through each measurement cell 31 due to slight differences in the installation of the sensor probes, resulting in poor consistency of the measurement results and achieving the same pressure at both ends of the three measurement cells 31, in this embodiment, the two ends of the three measurement cells 31 are connected in parallel, and a four-way ball valve is provided. Specifically, a four-way ball valve one 26 is provided between the three-way ball valve four 18 and the water inlet end of the measurement cell 31, and a four-way ball valve two 27 is provided between the water outlet end of the measurement cell 31 and the three-way ball valve two 12.

[0032] A pressure stabilizing and unloading valve 24 is provided between the standard gas outlet and the aeration tank 29 and the water storage tank 30, and the pressure stabilizing and unloading valve 24 is preset with a pressure threshold. The pressure stabilizing and unloading valve 24 is preset with a system internal pressure opening threshold. When the pressure is greater than the set opening threshold, the excess gas is discharged through the outlet of the pressure stabilizing and unloading valve 24. When the pressure is less than or equal to the set opening threshold, the pressure stabilizing and unloading valve 24 closes.

[0033] A three-way ball valve seven 22 is provided between the pressure stabilizing and unloading valve 24 and the three-way ball valve three 21. Two of the ends of the three-way ball valve seven 22 communicate with the pressure stabilizing and unloading valve 24 and the three-way ball valve three 21, and the remaining end is connected with a gas check valve one 23, and the gas check valve one 23 communicates with the main exhaust port. A gas check valve two 25 is provided between the pressure stabilizing and unloading valve 24 and the main exhaust port.

[0034] A valve two 19 is provided between the measurement cell 31 and the four-way ball valve one 26, and a liquid pressure gauge 10 is provided between the four-way ball valve one 26 and the three-way ball valve two 12.

[0035] A valve one 16 and a liquid check valve one 15 are provided between the water storage tank 30 and the main drain port 3, and a liquid check valve two 11 is provided between the three-way ball valve two 12 and the main drain port 3.

[0036] A valve one 16 and a level gauge one 6 are provided between the main water inlet 2 and the aeration tank 29, and a level gauge two 8 is provided between the water storage tank 30 and the three-way ball valve three 21.

[0037] A gas flowmeter 5 is provided between the standard gas inlet 1 and the three-way ball valve one 14, a gas pressure gauge 9 is provided between the three-way ball valve three 21 and the three-way ball valve seven 22, and a liquid flowmeter 7 and a liquid flow control valve 20 are provided between the three-way ball valve four 18 and the measurement cell 31.

[0038] A three-way ball valve six 13 is provided between the three-way ball valve two 12 and the aeration tank 29 and the three-way ball valve five 17.

[0039] A valve three 28 is provided at the water inlet end and the water outlet end of the measurement cell 31.

[0040] Standard gas inlet: The standard gas enters this device through the standard gas inlet 1. The gas flow path is switched by the three-way ball valve 14, so that the standard gas enters the aeration tank 29 for aeration or drives the flow of dissolved air water, or the standard gas enters the water storage tank 30 to drive the flow of dissolved air water. The pressure of the standard gas entering the standard gas inlet 1 needs to be greater than the pressure required during the aeration of this device.

[0041] Standard gas outlet: The pressure inside the device comes from the standard gas pressure. The standard gas entering the system is used for aeration and maintaining the internal pressure of the system. The excess gas flows through the pressure stabilizing and unloading valve 24 and is discharged from the device through the standard gas exhaust port 4. When it is necessary to completely release the internal pressure of the device, switch the three-way ball valve 7 22 to communicate with the gas check valve 1 23, and the internal pressure of the system is discharged from the device through the gas check valve 1 23. The entire gas flow path is as follows:

[0042] Aeration: Standard gas inlet 1 → Three-way ball valve 1 14 → Aeration tank 29 → Three-way ball valve 3 21 → Three-way ball valve 7 22 → Pressure stabilizing and unloading valve 24 → Gas check valve 2 25 → Standard gas exhaust port 4;

[0043] Exhaust and pressure relief: Three-way ball valve 3 21 → Three-way ball valve 7 22 → Gas check valve 1 23 → Standard gas exhaust port 4;

[0044] The dissolved air water flows from the aeration tank 29 to the water storage tank 30: Standard gas inlet 1 → Three-way ball valve 1 14 → Aeration tank 29 → Three-way ball valve 3 21 → Three-way ball valve 7 22 → Pressure stabilizing and unloading valve 24 → Gas check valve 2 25 → Standard gas exhaust port 4;

[0045] The dissolved air water flows from the water storage tank 30 to the aeration tank 29: Standard gas inlet 1 → Three-way ball valve 1 14 → Water storage tank 30 → Three-way ball valve 3 21 → Three-way ball valve 7 22 → Pressure stabilizing and unloading valve 24 → Gas check valve 2 25 → Standard gas exhaust port 4.

[0046] Water injection: Before aeration, pure water needs to be injected into the aeration tank 29 through the main water inlet 2. The injection volume is about three-quarters of the volume of the aeration tank 29 and should not be filled up. To ensure that the actual concentration of the dissolved air water after aeration is close to the theoretical concentration, the injected water should be pure water without impurities and mixtures. After injection, close the valve 19 2 to prevent air leakage.

[0047] When it is necessary to drain the dissolved air water inside this device, there are two situations:

[0048] When the liquid is in the aeration tank 29, after passing through the measuring tank 31, the water passes through the liquid check valve 2 11 and is discharged through the main drain port 3. The detailed flow paths of the liquid and gas are as follows:

[0049] Gas flow path: Standard gas inlet 1 → Three-way ball valve 1 14 → Aeration tank 29 → Three-way ball valve 3 21 → Three-way ball valve 7 22 → Pressure stabilizing and unloading valve 24 → Gas check valve 2 25 → Standard gas exhaust port 4;

[0050] Liquid flow path: Aeration tank 29 → Three-way ball valve four 18 → Liquid flowmeter 7 → Liquid flow control valve 20 → Four-way ball valve one 26 → Measuring cell 31 → Four-way ball valve two 27 → Liquid pressure gauge 10 → Three-way ball valve two 12 → Liquid check valve two 11 → Main drain port 3.

[0051] When the liquid is in the storage tank 30, close the three-way ball valve five 17 and the three-way ball valve three 21. The liquid can flow through the valve one 16 to the outlet main drain port 3. The detailed gas-liquid flow path is as follows;

[0052] Gas flow path: Standard gas inlet 1 → Three-way ball valve one 14 → Storage tank 30 → Three-way ball valve three 21 → Three-way ball valve seven 22 → Pressure stabilizing unloading valve 24 → Gas check valve two 25 → Standard gas exhaust port 4;

[0053] Liquid flow path: Storage tank 30 → Valve one 16 → Liquid check valve one 15 → Main drain port 3.

[0054] The pressure inside the entire device comes from the gas, and the pressure of the gas at the standard gas inlet 1 needs to be greater than the pressure required by the device to carry out aeration and drive the liquid to flow. The pressure regulation and stabilization of the device rely on the pressure stabilizing unloading valve 24. The internal pressure of the system can be set by adjusting the opening threshold of the pressure stabilizing unloading valve 24. When the pressure is greater than the set threshold, the excess gas will be discharged through the outlet of the pressure stabilizing unloading valve 24. When the pressure is less than or equal to the set threshold, the pressure stabilizing unloading valve 24 closes.

[0055] During the preparation of the dissolved air water, in order to allow the standard gas to fully dissolve in the water, it is necessary to close the three-way ball valve four 18 and the three-way ball valve seven 22 connected to the aeration tank 29, so that the water and the standard gas are fully mixed in the aeration tank 29. Part of the introduced standard gas is dissolved, and the undissolved part is discharged from the device through the exhaust port. The detailed gas flow path is: Standard gas inlet 1 → Three-way ball valve one 14 → Aeration tank 29 → Three-way ball valve three 21 → Three-way ball valve seven 22 → Pressure stabilizing unloading valve 24 → Gas check valve two 25 → Standard gas exhaust port 4. During the preparation process, the duration for the dissolved air water to reach the saturated state is related to the volume, pressure, temperature of the dissolved air water, and the flow rate of the standard gas.

[0056] When measuring the concentration of the dissolved air water, the sensor is installed on the measuring cell 31. During the entire measurement process, the dissolved air water flows back and forth between the aeration tank 29 and the storage tank 30 through the measuring cell 31, and the flow direction of the liquid path always remains unchanged during the flow through the measuring cell 31. Therefore, there are two cases during the measurement:

[0057] The dissolved air water is in the aeration tank 29, and the calibration gas is introduced into the aeration tank 29 to drive the dissolved air water to flow towards the storage tank 30. At this time, the gas in the storage tank 30 passes through the three-way ball valve three 21 to the pressure stabilizing and unloading valve 24 and is discharged from the calibration gas exhaust port 4. The detailed flow paths of the gas and liquid are as follows:

[0058] Calibration gas (calibration gas inlet 1 → three-way ball valve one 14 → aeration tank 29) → dissolved air water (aeration tank 29 → three-way ball valve four 18 → liquid flowmeter 7 → liquid flow control valve 20 → four-way valve one → measuring cell 31 → four-way valve two → liquid pressure gauge 10 → three-way ball valve two 12 → three-way ball valve six 13 → three-way ball valve five 17 → storage tank 30) → gas in the storage tank 30 (storage tank 30 → three-way ball valve three 21 → gas pressure gauge 9 → three-way ball valve seven 22 → pressure stabilizing and unloading valve 24 → gas check valve two 25 → calibration gas exhaust port 4)

[0059] The dissolved air water is in the aeration tank 29 and the storage tank 30. The calibration gas is introduced into the storage tank 30 to drive the dissolved air water to flow towards the aeration tank 29. At this time, the gas in the aeration tank 29 passes through the three-way ball valve three 21 to the pressure stabilizing and unloading valve 24 and is discharged from the calibration gas exhaust port 4. The detailed flow paths of the gas and liquid are as follows:

[0060] Calibration gas (calibration gas inlet 1 → three-way ball valve one 14 → storage tank 30) → dissolved air water in the storage tank 30 → three-way ball valve five 17 → three-way ball valve four 18 → liquid flowmeter 7 → liquid flow control valve 20 → four-way valve one → measuring cell 31 → four-way valve two → liquid pressure gauge 10 → three-way ball valve two 12 → three-way ball valve six 13 → aeration tank 29 → gas in the aeration tank 29 (aeration tank 29 → three-way ball valve three 21 → gas pressure gauge 9 → three-way ball valve seven 22 → pressure stabilizing and unloading valve 24 → gas check valve two 25 → calibration gas exhaust port 4).

[0061] During the preparation of the dissolved air water, it is necessary to keep the internal pressure of the device constant. If it is necessary to replace the sensor or perform other operations midway, the pressure needs to be released to atmospheric pressure. Then, the preparation of the dissolved air water needs to start over. Therefore, in order to improve the working efficiency of the device for preparing the dissolved air water and achieve the replacement of the sensor under pressure without affecting the preparation of the dissolved air water, the specific operation is to close the three-way ball valve four 18, switch the flow path of the three-way ball valve two 12, and release the pressure from the three-way ball valve four 18 through the measuring cell 31 to the three-way ball valve two 12, realizing the local pipeline pressure release without affecting the preparation process of the dissolved air water.

[0062] Under certain conditions, the present invention can quickly dissolve a certain concentration of gas in water to reach a saturated state, obtain saturated dissolved air water, and facilitate the measurement of the concentration of the aqueous solution. To achieve the purpose of quickly preparing the standard sample of the dissolved air water, the device of the present invention is small in volume and light in weight, and is particularly suitable for some scenarios with small demand for dissolved air water and rapid preparation, such as calibration and detection in laboratories and instrument and meters.

[0063] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A device for preparing standard samples of dissolved gas aqueous solutions and detecting their concentrations, characterized in that: It includes an aeration tank, a measuring tank, a water storage tank, a standard gas inlet, a standard gas outlet, a main water inlet and a main drain; The main water inlet is in communication with the aeration tank, the aeration tank is used for aeration and storage of dissolved air water, a sensor is provided on the measuring tank, the sensor is used for measuring the concentration of dissolved air water in the measuring tank, and the water storage tank is used for temporary storage of dissolved air water to change the flow direction; The standard gas inlet is communicated with the aeration tank and the water storage tank respectively through a three-way ball valve 1, and the main drain port is communicated with the measurement tank and the water storage tank respectively through a three-way ball valve 2; The measuring tank and the water storage tank are in communication with the standard gas outlet through a three-way ball valve; A three-way ball valve four is arranged between the aeration tank and the measuring tank, and a three-way ball valve five is arranged between the three-way ball valve four and the water storage tank.

2. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting a concentration thereof according to claim 1, characterized in that: A pressure-stabilizing unloading valve is arranged between the standard gas outlet and the aeration tank and the water storage tank, and the pressure-stabilizing unloading valve is preset with a pressure threshold.

3. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting a concentration thereof according to claim 2, characterized in that: A three-way ball valve seven is arranged between the pressure-stabilizing unloading valve and the three-way ball valve three, two ends of the three-way ball valve seven are in communication with the pressure-stabilizing unloading valve and the three-way ball valve three, and the remaining end is connected to a gas one-way valve one, the gas one-way valve one is in communication with the main exhaust port, and a gas one-way valve two is arranged between the pressure-stabilizing unloading valve and the main exhaust port.

4. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting a concentration thereof according to claim 1, characterized in that: There are three measuring pools, a four-way ball valve 1 is arranged between the three-way ball valve 4 and the water inlet end of the measuring pool, and a four-way ball valve 2 is arranged between the water outlet end of the measuring pool and the three-way ball valve 2.

5. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting its concentration according to claim 4, characterized in that: A valve 2 is arranged between the measuring pool and the four-way ball valve 1, and a liquid pressure gauge is arranged between the four-way ball valve 1 and the three-way ball valve 2.

6. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting its concentration according to claim 1, characterized in that: A valve 1 and a liquid one-way valve 1 are arranged between the water storage tank and the main drain outlet, and a liquid one-way valve 2 is arranged between the three-way ball valve 2 and the main drain outlet.

7. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting a concentration thereof according to claim 1, characterized in that: A valve one and a liquid level gauge one are arranged between the main water inlet and the aeration tank, and a liquid level gauge two is arranged between the water storage tank and the three-way ball valve three.

8. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting its concentration according to claim 3, characterized in that: A gas flow meter is arranged between the standard gas inlet and three-way ball valve one, a gas pressure gauge is arranged between three-way ball valve three and three-way ball valve seven, and a liquid flow meter and a liquid flow control valve are arranged between three-way ball valve four and the measuring pool.

9. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting its concentration according to claim 1, characterized in that: A three-way ball valve six is ​​arranged between the three-way ball valve two and the aeration tank and the three-way ball valve five.

10. The device for preparing a standard sample of a dissolved gas aqueous solution and detecting its concentration according to claim 1, characterized in that: An aeration plate is arranged at the bottom of the aeration tank, and the aeration plate is placed in the middle of the aeration tank. The aeration plate has multiple layers of steel mesh with apertures ranging from small to large.

Images