CN211348199U

CN211348199U - A high-efficient aqueous vapor mixing arrangement for calibration of solubility gas sensor

Info

Publication number: CN211348199U
Application number: CN201922353360.0U
Authority: CN
Inventors: 郑旻辉; 杨俊毅; 潘建明; 林燈科; 廖丹宁; 倪玮
Original assignee: Second Institute of Oceanography MNR
Current assignee: Second Institute of Oceanography MNR
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-08-25
Anticipated expiration: 2029-12-24

Abstract

The utility model discloses a high-efficient aqueous vapor mixing arrangement for calibration of solubility gas sensor. The utility model discloses an air feeder, blender, water receiver and control box through setting up the water receiver, combines thin shower head, can let whole waters all carry out abundant contact with the form and the gas of water smoke, but the at utmost promotes aqueous vapor mixing efficiency. Additionally, the utility model discloses a blender can regard as the calibrator to use simultaneously, and the aqueous vapor is mixed and is directly carried out calibration test after accomplishing. The device is whole need not to open the storehouse in the experiment, switches through valves such as accuse gas three-way valve, accuse water three-way valve, water control valve and can realize draining, intaking, drum gas, whole operations such as circulation, but furthest reduces external environment's interference, benefits from high mixing efficiency moreover, and this device has great water volume, can realize large-scale sensor calibration or a plurality of small-size sensor calibration simultaneously.

Description

A high-efficient aqueous vapor mixing arrangement for calibration of solubility gas sensor

Technical Field

The utility model belongs to sensor calibration field, concretely relates to a high-efficient aqueous vapor mixing arrangement for calibration of solubility gas sensor.

Background

Various gases are dissolved in seawater, and dissolved oxygen, carbon dioxide, methane and other gases have very important influence on ecological environment, so that the method is widely concerned, and has important significance in rapidly and accurately determining the content of the dissolved gases in the water body. In recent years, with the technological progress, the measurement technologies of in-situ sensors such as a dissolved oxygen sensor, a carbon dioxide sensor, a methane sensor and the like have been rapidly developed. Because the sensor can easily acquire a large amount of in-situ data, the related sensor is widely applied to the fields of marine products, environment, scientific research and the like. However, the sensor inevitably suffers from data drift due to biological contamination, component loss and the like in the long-term field use process, so that the sensor calibration is required to be carried out regularly.

Through specific equipment and method, aiming at a certain parameter to be calibrated (such as dissolved oxygen, carbon dioxide, methane and the like), the concentration of the parameter in a water body test environment can be quickly changed and stably maintained, and the method is the basis for carrying out high-efficiency and high-precision sensor calibration work. To change the concentration of a certain dissolved gas in a body of water, two methods are generally used: (1) adding a chemical reagent into the water body to react, and consuming or generating the gas; (2) and introducing mixed gas with different contents to change the dissolved amount of the gas in the water body. By adopting a mode of adding a chemical reagent for reaction, on one hand, the concentration value of the dissolved gas after reaction is difficult to accurately control, and on the other hand, the added chemical reagent often causes interference on the measurement of the reference value, so that the method is not suitable for the calibration test of the sensor. The mode of introducing gas into the water body inevitably needs to experience the process of water-gas mixing balance, and the speed directly determines the efficiency of the whole sensor calibration test.

The currently widely adopted water-gas mixing measures include: (1) blowing gas into a water body, and adding bubbles by using a sand nozzle; (2) placing materials such as microbeads in a water body to increase the contact area of water and air; (3) and spraying the water body in the gas by adopting a spray header and other modes. Although the water-gas mixing exchange can be accelerated to a certain degree by using one or more of the above measures, the efficiency of the large-volume water body is still low, and the requirement of efficient calibration of the sensor cannot be met.

Therefore, the efficient water-gas balance device is established, the adjusting speed of the concentration of the soluble gas in the water body is greatly increased, and the sensor calibration device is expected to greatly improve the calibration efficiency and the calibration precision of the sensor when being used for calibration of the soluble gas sensor.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to overcome current aqueous vapor mixing arrangement and measure shortcoming of inefficiency, provide a high-efficient aqueous vapor mixing arrangement that can be used to the calibration of solubility gas sensor.

The utility model discloses the concrete technical scheme who adopts as follows:

an efficient water-gas mixing device for calibration of a dissolved gas sensor comprises a gas supply device, a mixer, a water storage device and a control box; the gas supply device consists of a gas supply device to be calibrated and a nitrogen supply device, gas is supplied into the mixer through a pipeline with a gas control three-way valve, and the gas control three-way valve is a two-in one-out three-way valve; the mixer is a sealed container for placing a sensor, the top of the mixer is provided with a breather valve, a water inlet, a gas inlet and a gas outlet, the outside of the gas inlet is connected with the outlet of a gas control three-way valve through a gas supply pipeline, and a gas outlet at the tail end of the gas supply pipeline extends below the liquid level of the mixer; a water control three-way valve, a high-pressure water pump and an air pump are arranged in the control box, and the water control three-way valve is a two-in one-out three-way valve; the gas outlet is connected to a first inlet of the gas control three-way valve through a gas outlet pipeline with a gas pump; the water storage device is arranged below the mixer and is communicated with the mixer through a water control valve; the device for supplying the gas to be calibrated comprises a device for storing the gas to be calibrated and a first pressure reducing valve which are sequentially connected through a gas pipeline to be calibrated, and the nitrogen supply device comprises a nitrogen storage device and a second pressure reducing valve which are sequentially connected through a nitrogen pipeline; the tail ends of the gas pipeline to be calibrated and the nitrogen pipeline are converged into a gas supply pipeline and then connected to a second inlet of the gas control three-way valve; the first inlet of the water control three-way valve is connected with the water intake of the mixer, the second inlet is connected with the water intake of the water storage device, the outlet of the water control three-way valve is communicated with the water intake of the mixer through a water pipe with a high-pressure water pump, and the water control three-way valve is connected with a spray head used for spraying the mixer.

Preferably, the gas supply pipeline passing through the gas inlet extends into the bottom of the inner cavity of the mixer, and the gas outlet pipeline passing through the gas outlet is positioned at the top of the inner cavity of the mixer.

Preferably, the mixer intake is located at the bottom of the mixer and the reservoir intake is located at the bottom of the reservoir.

Preferably, the mixer is a cylindrical shell and is made of organic glass.

Preferably, the reservoir volume is no greater than the volume of the mixer.

Preferably, the spray header adopts a water-gas mixed type fine atomization spray head.

Preferably, an air blowing sand nozzle is installed at an air outlet at the tail end of the air supply pipeline.

Preferably, the gas storage device to be calibrated is a gas cylinder to be calibrated; the nitrogen storage device is a nitrogen cylinder.

Preferably, the connection between the air pipe and the interface is provided with a seal.

Compared with the prior art, the utility model, following beneficial effect has:

the utility model discloses a high-efficient aqueous vapor mixing arrangement for dissolubility gas sensor calibration can improve calibration efficiency by a wide margin, and the concrete manifestation is at: (1) by arranging the water storage device and combining with the fine atomization nozzle, all water bodies can be fully contacted with gas in a water mist mode, and the water-gas mixing efficiency can be improved to the maximum extent; (2) the mixer can be used as a calibrator at the same time, and a calibration test is directly carried out after the water-gas mixing is finished; (3) the whole test process does not need opening the bin, and the whole operations of water discharging, water feeding, air blowing, circulation and the like can be realized by switching valves such as an air control three-way valve, a water control valve and the like, so that the interference of the external environment can be reduced to the maximum extent; (4) benefit from high mixing efficiency, this device has great water volume, can realize large-scale sensor calibration or a plurality of small-size sensor calibration simultaneously.

Drawings

FIG. 1 is a schematic structural view of the high-efficiency water-gas mixing device of the present invention;

FIG. 2 is a schematic diagram of the device used for controlling the concentration of dissolved oxygen in a water body;

in the figure: the device comprises a mixer 1, a water storage device 2, a control box 3, a water control three-way valve 4, a high-pressure water pump 5, an air pump 6, a vent valve 7, a water inlet 8, an air inlet 9, an air outlet 10, an air control three-way valve 11, a water control valve 12, a to-be-calibrated air storage device 13, a nitrogen storage device 14, a first pressure reducing valve 15, a second pressure reducing valve 16, a mixer water intake 17, a water storage device water intake 18, a spray header 19, an air blowing sand nozzle 20 and a sensor 21.

Detailed Description

The invention will be further elucidated and described with reference to the drawings and embodiments. The utility model discloses in the technical characteristics of each embodiment under the prerequisite that does not conflict each other, all can carry out corresponding combination.

As shown in fig. 1, the main components of the high efficiency water-air mixing device for calibration of a dissolved gas sensor provided in an embodiment of the present invention include a gas supply device, a mixer 1, a water reservoir 2 and a control box 3. Wherein the mixer 1 is the main body for performing the water-gas mixing, and the gas supply means is used for supplying gas into the mixer 1 through the pipe, adjusting the concentration of the dissolved gas to be calibrated in the mixer 1. The utility model discloses in, the solubility gas can be dissolved oxygen, carbon dioxide, methane etc. have the gas of certain solubility in aqueous.

The gas supply device consists of a gas supply device to be calibrated and a nitrogen supply device, and supplies gas into the mixer 1 through a pipeline with a gas control three-way valve 11. The gas control three-way valve 11 is a two-in one-out three-way valve, the gas inlet end of the gas control three-way valve is provided with two gas inlets, the gas outlet end of the gas control three-way valve is provided with only one gas outlet, and one of the two gas inlets is communicated with the gas outlet.

Mixer 1 is a sealed container who is used for placing the sensor, and the shape is cylindrical casing, adopts the organic glass material to make to observe interior state. The top of the mixer 1 is provided with a breather valve 7, a water inlet 8, a gas inlet 9 and a gas outlet 10, and the rest parts of the mixer 1 are kept closed except the openings. The vent valve 7 can be opened or closed according to the test requirements, and is communicated with the external atmosphere when opened so as to release the internal pressure. The outside of the gas inlet 9 is connected with the outlet of the gas control three-way valve 11 through a gas supply pipeline, and a gas outlet at the tail end of the gas supply pipeline extends below the liquid level of the mixer 1 and is used for blowing gas conveyed in the gas supply pipeline into a water body to realize water-gas exchange of the soluble gas. The control box 3 is a box body for placing various control devices, and a water control three-way valve 4, a high-pressure water pump 5 and an air pump 6 are arranged in the box body. The water control three-way valve 4 is a two-in one-out three-way valve, the water inlet end of the water control three-way valve is also provided with two water inlets, the water outlet end of the water control three-way valve is also provided with only one water outlet, and one of the two water inlets is communicated with the water outlet. The gas outlet 10 at the top of the mixer 1 is connected to the first inlet of the gas-control three-way valve 11 by a gas outlet pipeline with a gas pump 6. The water storage device 2 is arranged below the mixer 1 and is communicated with the mixer 1 through a water control valve 12. The water control valve 12 is used for controlling whether the water in the mixer 1 can flow into the water storage device 2 or not, when the water control valve 12 is opened, the flow path is through, the water in the mixer 1 can flow into the water storage device 2 to be stored under the action of gravity, and when the water control valve 12 is closed, the water cannot flow. Therefore, to ensure that the reservoir 2 is sufficient to store the water flowing down the mixer 1, the volume of the reservoir 2 should not be greater than the volume of the mixer 1.

The gas supply device to be calibrated comprises a gas storage device 13 to be calibrated and a first pressure reducing valve 15 which are sequentially connected through a gas pipeline to be calibrated. Similarly, the nitrogen supply means includes a nitrogen storage device 14 and a second pressure reducing valve 16 connected in series by a nitrogen gas line. And the tail ends of the gas pipeline to be calibrated and the nitrogen pipeline are converged into a gas supply pipeline and then connected to a second inlet of the gas control three-way valve 11. The first pressure reducing valve 15 and the second pressure reducing valve 16 can adjust the opening degree, and thus the air flow of the branch in which the first pressure reducing valve and the second pressure reducing valve are respectively controlled. By adjusting the opening of the first pressure reducing valve 15 and the second pressure reducing valve 16, the mixing ratio of the gas to be calibrated and the nitrogen in the gas supply line can be changed, and the concentration of the soluble gas in the gas blown into the mixer 1 can be changed.

In addition, because only one of the two inlets of the gas control three-way valve 11 can be communicated, the source of the gas blown into the mixer 1 can be adjusted by changing the connection direction of the gas inlet end of the gas control three-way valve 11. When it is necessary to change the gas concentration in the mixer 1, the gas concentration in the mixer 1 can be changed by using a gas of a specific concentration in the gas supply line by adjusting the gas inlet end to communicate with the gas supply line. And when the gas concentration in the blender 1 need not to be changed, then can be through adjusting the inlet end to the intercommunication opposite side, communicate the gas outlet pipe way promptly, utilize the effect of air pump 6 to make the gas in the blender 1 constantly circulate, utilize inside gas to blast, and then realize the aqueous vapor and mix.

In addition, the utility model discloses in the purpose that sets up water receiver 2 below blender 1 can both directly take out the water from water receiver 2 at every turn, carries out initial aqueous vapor and mixes, and need not just need utilize the water of blender 1 inside to carry out self circulation at the initial stage. The method for changing water can greatly improve the water-gas mixing efficiency. For this purpose, the water-controlling three-way valve 4 is used for switching, the first inlet of the water-controlling three-way valve 4 is connected with the mixer water intake 17, the second inlet is connected with the water intake 18 of the water storage device, the outlet of the water-controlling three-way valve is communicated with the mixer water intake 8 through a water pipe with the high-pressure water pump 5, and the circulating water source can be changed through the switching of the inlet ends. To ensure smooth and convenient water intake, the mixer intake 17 should open at the bottom of the side of the mixer 1 and the reservoir intake 18 should open at the bottom of the side of the reservoir 2.

In addition, after the circulating water pipe passes through the mixer water inlet 8 and enters the interior of the mixer 1, a spray header 19 for spraying the mixer 1 needs to be connected. In this embodiment, in order to improve the mixing efficiency, the shower head 19 uses a water-gas mixed type fine atomization nozzle to atomize the shower water, thereby increasing the water-gas contact surface area and prolonging the contact time. Similarly, in order to ensure that the gas-water contact time and the mixing efficiency are improved as much as possible, the gas supply pipeline passing through the gas inlet 9 extends into the bottom of the inner cavity of the mixer 1, the gas blowing sand nozzle 20 is installed at the gas outlet at the tail end of the gas supply pipeline passing through the gas inlet 9, and the gas outlet pipeline passing through the gas outlet 10 is located at the top of the inner cavity of the mixer 1.

In this embodiment, the to-be-calibrated gas storage device 13 is a to-be-calibrated gas cylinder, and the nitrogen storage device 14 is a nitrogen cylinder. Of course, other high pressure gas storage devices may be used as long as the gas storage function is achieved.

In addition, for the air tightness inside the mixer 1, the connections between the respective air pipes, water pipes and the respective connections on the housing should have a seal. It should be noted that, in the mixer 1, the calibration may be performed for a large sensor, or for a plurality of small sensors at the same time, and the calibration scheme may be set according to actual needs.

The operation method of the device of the present invention for controlling the dissolved oxygen concentration in the water will be further described below by taking oxygen as the dissolved gas to be calibrated and using a seawater dissolved oxygen sensor 21 as an example. In the calibration process of the seawater dissolved oxygen sensor 21, the key steps are to set a plurality of target oxygen concentrations according to the calibration requirements, when a certain target oxygen concentration is reached in the mixer 1, the water body and the gas are subjected to sufficient water-gas exchange, and then the calibration of the seawater dissolved oxygen sensor is performed based on the water body reaching balance.

In the present embodiment, the target oxygen concentration required for calibration is 100%, 85%, 70%, 55%, 40%, 25% in this order. According to the preset target, the method for adjusting the concentration of the dissolved oxygen in the water body by using the high-efficiency water-gas mixing device is specifically described as follows:

(1) the connection of the parts of the device is completed, and the seawater dissolved oxygen sensor 21 to be calibrated is placed in the inner cavity of the mixer 1 and fixed (as shown in fig. 2). The mixer 1 is filled with test water in advance in an amount satisfying the calibration, the seawater dissolved oxygen sensor 21 is turned on, and the operation procedure is started.

(2) And opening the ventilation valve 7 and the water control valve 12, and closing the water control valve 12 after the water in the mixer 1 is completely drained to the water storage device 2 under the action of gravity.

(3) The air inlet end of the air control three-way valve 11 is adjusted to be communicated with the air supply pipeline.

(4) According to the relation between the oxygen concentration in the mixer 1 and the control target value, the opening degrees of the first reducing valve 15 and the second reducing valve 16 are adjusted, so that the oxygen and the nitrogen in the gas supply pipeline are mixed according to the set flow ratio to obtain the proper oxygen concentration, and the proper oxygen concentration is introduced into the mixer 1. When the opening degree of the valve is adjusted in this step, if the oxygen concentration in the mixer 1 is higher than the control target value, the opening degree of the second reducing valve 16 is increased, the opening degree of the first reducing valve 15 is decreased, and the oxygen concentration in the gas supply pipeline is further decreased; if the oxygen concentration in the mixer 1 is lower than the control target value, the opening degree of the second pressure reducing valve 16 is decreased, the opening degree of the first pressure reducing valve 15 is increased, and the oxygen concentration in the gas supply line is increased.

(5) The oxygen concentration in the mixer 1 is continuously measured by using the seawater dissolved oxygen sensor 21, and when the saturation measurement value reaches 100%, the first pressure reducing valve 15, the second pressure reducing valve 16, and the vent valve 7 are closed to stop the air intake of the air supply line.

(6) Adjusting the water inlet end of a water control three-way valve 4 to a water inlet 18 communicated with a water storage device, opening a high-pressure water pump 5 to spray water in the water storage device 2 from the top of a mixer 1 in a spraying mode, adjusting the air inlet end of an air control three-way valve 11 to a communicated air outlet pipeline, and opening an air pump 6 to ensure that air in the mixer 1 continuously and circularly blows into the water body at the inner bottom; after the liquid level of the water in the mixer 1 submerges the soluble gas sensor 21 and reaches a target position (the specific height is set according to the test requirement), the water inlet end of the water control three-way valve 4 is adjusted to be communicated with the water intake 17 of the mixer, so that the water in the mixer 1 is continuously and circularly sprayed, and the water is fully contacted and exchanged by the air blowing of the gas in the air blowing sand nozzle 20 and the spraying of the spraying head 19 in the process, so that the concentration of the two-phase oxygen tends to be balanced gradually. Therefore, in the circulation process of the water and the gas in the mixer 1, the dissolved oxygen concentration of the water in the mixer 1 is continuously measured by using the dissolved gas sensor 21, the water and the gas are balanced after the reading of the dissolved oxygen concentration is stable, the detected value is recorded, and the water in the mixer 1 can be used for calibrating the dissolved gas sensor.

(7) The steps (2) to (6) are repeated, but for each repetition, the opening degrees of the two pressure reducing valves need to be changed in accordance with a preset target oxygen concentration calibration point to adjust the concentration of the dissolved gas in the mixer 1. Thus, in the present embodiment, the detection values of the seawater dissolved oxygen sensor 21 after the initial oxygen concentration of the gas in the mixer 1 is balanced by mixing water and gas under the conditions of 85%, 70%, 55%, 40% and 25% may be sequentially obtained, and the stabilized water may be used as the calibration points of the seawater dissolved oxygen sensor.

Therefore, the utility model discloses the device is at the operation in-process, has adopted the combined mode of air-blowing + spraying + changing water in fact, can realize the aqueous vapor exchange balance fast. To illustrate the improvement in water-air mixing efficiency of the present apparatus over the prior art apparatus, a set of comparative experiments were conducted. The following three water-gas mixing operation modes are characterized respectively by gas blowing, spraying and water changing in the start-stop device:

A. air blowing only: i.e. each time it is started, the water in the mixer 1 is not drained to the reservoir 2, but is completely stored in the mixer 1, circulating itself. Meanwhile, in the water-gas exchange process, the operation of the water pump in the step (6) is stopped, spraying is not carried out, and only the air blowing mode of the air blowing sand nozzle 20 is adopted.

B. Air blowing and spraying: i.e. each time it is started, the water in the mixer 1 is not drained to the reservoir 2, but is completely stored in the mixer 1, circulating itself. But both spraying and blowing are performed during the water-gas exchange process.

C. Air blowing, spraying and water changing: adopt the above-mentioned adjusting method of the utility model, when starting up at every turn, need to discharge the water in the blender 1 to the water receiver 2, pour into it into blender 1 through the water pump again, carry out the internal circulation afterwards. Meanwhile, in the water-gas exchange process, spraying and air blowing are carried out.

Three sets of experiments take oxygen as an example, the initial oxygen concentrations in the water and air in the mixer are approximately the same, the water-air mixing efficiency is judged by comparing the time required for reaching equilibrium after mixing, and the specific results are shown in table 1. According to the result, the utility model discloses a method that the device adopted "blowing + spray + trade water" reaches balanced required time shortest, shows for current device, and this device has showing in the aspect of water-gas mixing efficiency and promotes. The method of discharging all the water bodies in the mixer 1 to the water receiver 2 and then pumping the water bodies into the mixer 1 again each time can ensure that the water bodies pumped out from the water receiver 2 exchange with gas at the maximum mass transfer speed in the mixer 1, and avoids the water bodies which finish water-gas exchange from mixing with other water bodies which do not exchange yet and further reduces the mass transfer efficiency.

TABLE 1 comparison of the Water-air mixing efficiency of this device with the existing device

The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims

1. An efficient water-gas mixing device for calibration of a dissolved gas sensor is characterized by comprising a gas supply device, a mixer (1), a water storage device (2) and a control box (3); the gas supply device consists of a gas supply device to be calibrated and a nitrogen supply device, gas is supplied into the mixer (1) through a pipeline with a gas control three-way valve (11), and the gas control three-way valve (11) is a two-in one-out three-way valve; the mixer (1) is a sealed container for placing a sensor, the top of the mixer is provided with a breather valve (7), a water inlet (8), a gas inlet (9) and a gas outlet (10), the outside of the gas inlet (9) is connected with the outlet of a gas control three-way valve (11) through a gas supply pipeline, and a gas outlet at the tail end of the gas supply pipeline extends below the liquid level of the mixer (1); a water control three-way valve (4), a high-pressure water pump (5) and an air pump (6) are arranged in the control box (3), and the water control three-way valve (4) is a two-in one-out three-way valve; the gas outlet (10) is connected to a first inlet of a gas control three-way valve (11) through a gas outlet pipeline with a gas pump (6); the water storage device (2) is arranged below the mixer (1) and is communicated with the mixer (1) through a water control valve (12); the device for supplying the gas to be calibrated comprises a device (13) for storing the gas to be calibrated and a first pressure reducing valve (15), which are sequentially connected through a gas pipeline to be calibrated, and the nitrogen supply device comprises a nitrogen storage device (14) and a second pressure reducing valve (16), which are sequentially connected through a nitrogen pipeline; the tail ends of the gas pipeline to be calibrated and the nitrogen pipeline are converged into a gas supply pipeline and then connected to a second inlet of the gas control three-way valve (11); the first inlet of the water control three-way valve (4) is connected with a mixer water intake (17), the second inlet is connected with a water intake (18) of the water storage device, the outlet of the water control three-way valve is communicated to a mixer water intake (8) through a water pipe with a high-pressure water pump (5), and the water control three-way valve is connected with a spray head (19) used for spraying the mixer (1).

2. The high efficiency water gas mixing device for calibration of a dissolved gas sensor according to claim 1, characterized in that the gas supply line through the gas inlet (9) extends into the bottom of the inner cavity of the mixer (1) and the gas outlet line inlet out of the gas outlet (10) is located at the top of the inner cavity of the mixer (1).

3. The high efficiency water gas mixing device for calibration of dissolved gas sensor according to claim 1, characterized by that the mixer water intake (17) is located at the bottom of the mixer (1) and the reservoir water intake (18) is located at the bottom of the reservoir (2).

4. The efficient water-gas mixing device for calibration of a dissolved gas sensor according to claim 1, wherein the mixer (1) is a cylindrical housing made of plexiglass.

5. The high efficiency water gas mixing device for calibration of a dissolved gas sensor according to claim 1, characterized in that the volume of the water reservoir (2) is not larger than the volume of the mixer (1).

6. The efficient water-gas mixing device for calibration of dissolved gas sensor according to claim 1, characterized in that the shower head (19) is a water-gas mixed type fine atomization shower head.

7. The high efficiency water gas mixing device for calibration of a dissolved gas sensor according to claim 1, wherein the gas outlet at the end of the gas supply line is fitted with a blowing sand nozzle (20).

8. The high efficiency water gas mixing device for calibration of dissolved gas sensors according to claim 1, wherein the gas device (13) to be calibrated is a gas cylinder to be calibrated.

9. The high efficiency water gas mixing device for calibration of a dissolved gas sensor according to claim 1, wherein the nitrogen storage means (14) is a nitrogen gas cylinder.