Dissolved gas concentration monitoring device and monitoring method

Abstract

The invention discloses a dissolved gas concentration monitoring device and method, and the device comprises a first container which is provided with a sealed cavity, and a liquid inlet level and a liquid outlet level which are located in the sealed cavity, and the liquid inlet level is higher than the liquid outlet level; the liquid inlet pipeline is used for conveying air-dissolved water into the closed cavity, the output end of the liquid inlet pipeline corresponds to the liquid inlet level, and the air-dissolved water conveyed into the closed cavity can release dissolved air; the liquid outlet pipeline is used for discharging water in the first container, and the liquid inlet end of the liquid outlet pipeline corresponds to the liquid outlet level; the second container is communicated with the liquid outlet end of the liquid outlet pipeline, and water with air separated out can flow into the second container through the liquid outlet pipeline; and the weighing equipment is used for weighing the first container and the second container. The dissolved gas concentration monitoring device provided by the invention can quantitatively analyze the amount of air actually dissolved in the dissolved gas water, so as to obtain the dissolved gas concentration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring equipment, in particular to a dissolved air concentration monitoring device and a monitoring method. BACKGROUND

[0002] In the sewage air flotation treatment process, the quality of dissolved air water is the core factor determining the air flotation effect, and the key indicator is the concentration of dissolved air in water (referred to as "dissolved air concentration"). In the traditional process, the control of dissolved air water only relies on indirect parameters such as the liquid level of the dissolved air tank and the compressed air pressure, and cannot directly and quantitatively analyze the actual dissolved air amount in water, which leads to significant limitations in process adjustment:

[0003] It is highly skilled to rely on the experience of operators, and the human subjective factors (such as judgment deviation and operation habit) directly determine the treatment effect, which easily leads to poor running stability. That is, only indirect parameters can be used to control the dissolved air water.

[0004] Therefore, how to monitor the dissolved air concentration is a problem to be solved by the personnel in this technical field. SUMMARY

[0005] Therefore, the present application provides a dissolved air concentration monitoring device to monitor the dissolved air concentration. The present application also provides a dissolved air concentration monitoring method.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A dissolved air concentration monitoring device, comprising:

[0008] A first container having a closed cavity and a liquid inlet level and a liquid outlet level in the closed cavity, the liquid inlet level being higher than the liquid outlet level;

[0009] A liquid inlet pipeline for conveying dissolved air water into the closed cavity, the output end of the liquid inlet pipeline corresponding to the liquid inlet level, and the dissolved air water conveyed into the closed cavity being capable of releasing dissolved air;

[0010] A liquid outlet pipeline for discharging water in the first container, the liquid inlet end of the liquid outlet pipeline corresponding to the liquid outlet level;

[0011] A second container in communication with the liquid outlet end of the liquid outlet pipeline, and water releasing air being capable of flowing from the liquid outlet pipeline into the second container;

[0012] A weighing device for weighing the weight of the first container and the second container.

[0013] Optionally, in the dissolved air concentration monitoring device, the first container comprises:

[0014] A conical bottle, a small end of the conical bottle is a bottle mouth, the bottle mouth is arranged downwardly;

[0015] A closure for plugging the bottle mouth, the closure has a first aperture for the output end of the liquid inlet pipeline to enter the closed cavity and a second aperture for the liquid inlet end of the liquid outlet pipeline to enter the closed cavity.

[0016] Optionally, in the dissolved gas concentration monitoring device, the liquid inlet level is located at the bottom of the conical bottle.

[0017] Optionally, in the dissolved gas concentration monitoring device, the conical bottle is a transparent bottle body or has a transparent observation window.

[0018] Optionally, in the dissolved gas concentration monitoring device, the number of the weighing devices is one.

[0019] The second container and the first container are movably arranged on the weighing device for weighing.

[0020] Optionally, in the dissolved gas concentration monitoring device, the weighing device is a platform scale, which has a support surface for placing the first container and the second container.

[0021] Optionally, in the dissolved gas concentration monitoring device, the liquid inlet pipeline has a first on-off valve for controlling the on-off and flow rate.

[0022] And / or the liquid outlet pipeline has a second on-off valve for controlling the on-off and flow rate.

[0023] The present application also provides a dissolved gas concentration monitoring method, which applies the dissolved gas concentration monitoring device as described in any one of the above, comprising:

[0024] Preparation before monitoring, filling water in the closed cavity of the first container, weighing the first container and recording the initial weight X;

[0025] Dissolved gas water introduction and bubble release, transporting the dissolved gas water from the liquid inlet pipeline to the closed cavity, so that the dissolved gas water can release the dissolved air in the closed cavity, and the water filled in the closed cavity and the water after the dissolved gas water releases air flows into the second container through the liquid outlet pipeline;

[0026] Calculation of dissolved gas concentration, when the water after the dissolved gas water releases air and flows into the second container reaches the target weight K, stopping the transportation of the dissolved gas water, weighing the first container and recording the current weight B, obtaining the air volume in the closed cavity of the first container according to the initial weight X and the current weight B, obtaining the dissolved gas water volume according to the target weight K, and obtaining the dissolved gas concentration according to the formula: dissolved gas concentration = air volume / dissolved gas water volume.

[0027] Optionally, in the above-mentioned dissolved gas concentration monitoring method, in the preparation step before the monitoring, the closed cavity of the first container is filled with water, and the liquid inlet level is located at the bottom of the conical bottle of the first container.

[0028] Optionally, in the above-mentioned dissolved gas concentration monitoring method, the method further comprises correlating the liquid level of the dissolved gas tank with the dissolved gas concentration of the dissolved gas water in the dissolved gas tank.

[0029] The pressure in the dissolved gas tank is kept constant, the dissolved gas water in the dissolved gas tank is transported into the closed cavity through the liquid inlet pipeline, the dissolved gas concentration of the dissolved gas water at different liquid levels in the dissolved gas tank is monitored, and the correlation between the liquid level and the dissolved gas concentration is established.

[0030] As can be seen from the above technical solutions, the dissolved gas concentration monitoring device provided by the present application can fill the closed cavity with water before monitoring the dissolved gas concentration. The water filled in the closed cavity can flow out through the liquid outlet pipeline by transporting the dissolved gas water into the closed cavity of the first container. The dissolved gas water transported into the closed cavity of the first container can release the dissolved air in the closed cavity of the first container, and the air remains in the first container. The water from which the air is released flows into the second container through the liquid outlet pipeline. Since the liquid inlet level is higher than the liquid outlet level, the air remains in the closed cavity and cannot flow out through the liquid outlet pipeline when the water level in the closed cavity is not lower than the liquid outlet level. The weight change of the first container and the weight change of the second container can be obtained by weighing the first container and the second container by the weighing device. The weight change of the first container is the weight of the water corresponding to the volume of the dissolved air released by the dissolved gas water in the closed cavity of the first container. The volume of the air released by the dissolved gas water can be obtained according to the weight change of the first container (the density of water is 1 kg / L). The weight change of the second container is the weight of the dissolved gas water, and the volume of the dissolved gas water can be obtained according to the weight change of the second container (the density of water is 1 kg / L). Thus, the dissolved gas concentration can be obtained according to the formula: dissolved gas concentration = air volume / dissolved gas water volume. The dissolved gas concentration monitoring device provided by the present application can quantitatively analyze the actual dissolved air amount in the dissolved gas water, thereby obtaining the dissolved gas concentration. The dissolved gas concentration monitoring device provided by the present application can achieve the effect of monitoring the dissolved gas concentration. Moreover, the dissolved gas concentration monitoring device provided by the present application can achieve the effect of monitoring the dissolved gas concentration, breaking through the limitation of indirect parameter control. Moreover, the monitoring of the dissolved gas concentration can be completed without professional skills, thereby reducing the dependence on the operator.

[0031] The present application also provides a dissolved gas concentration monitoring method, which has the same technical effects as the above-mentioned dissolved gas concentration monitoring device, and will not be described in detail here. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to some of the embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort.

[0033] Figure 1 A structural schematic diagram of a dissolved gas concentration monitoring device provided by an embodiment of the present application is shown.

[0034] Figure 2 A flow schematic diagram of a dissolved gas concentration monitoring method provided by an embodiment of the present application is shown.

[0035] In the present application,

[0036] The liquid inlet pipeline 1, the first container 2, the conical bottle 21, the closure 22, the air 3, the water 4, the second container 5, the liquid outlet pipeline 6, and the weighing device 7. DETAILED DESCRIPTION

[0037] The present application discloses a dissolved gas concentration monitoring device for monitoring the dissolved gas concentration. The present application also provides a dissolved gas concentration monitoring method.

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0039] As shown in the drawings, Figure 1 The present application provides a dissolved gas concentration monitoring device, which comprises a first container 2, a liquid inlet pipeline 1, a liquid outlet pipeline 6, a second container 5, and a weighing device 7.

[0040] The first container 2 has a closed cavity and a liquid inlet level and a liquid outlet level in the closed cavity, and the liquid inlet level is higher than the liquid outlet level. The liquid inlet pipeline 1 is used for conveying dissolved gas water into the closed cavity, and the output end of the liquid inlet pipeline 1 corresponds to the liquid inlet level. The dissolved gas water conveyed into the closed cavity can release dissolved air 3. The liquid outlet pipeline 6 is used for discharging water in the first container 2, and the liquid inlet end of the liquid outlet pipeline 6 corresponds to the liquid outlet level. The closed cavity is a cavity without other openings, and the fluid (air 3 and liquid, etc.) entering and leaving the closed cavity can only enter and leave through the liquid inlet pipeline 1 and the liquid outlet pipeline 6. The second container 5 is in communication with the liquid outlet end of the liquid outlet pipeline 6, and the water releasing air 3 can flow into the second container 5 through the liquid outlet pipeline 6. The weighing device 7 is used for weighing the weight of the first container 2 and the second container 5.

[0041] The dissolved gas concentration monitoring device provided by the embodiment of the present application can fill the closed cavity with water before monitoring the dissolved gas concentration, and the water filled in the closed cavity can flow out through the liquid outlet pipeline 6 by delivering the dissolved gas water to the closed cavity of the first container 2. The dissolved gas water delivered to the closed cavity of the first container 2 by the liquid inlet pipeline 1 can release the dissolved air 3 in the closed cavity of the first container 2, and the air 3 remains in the first container 2, and the water from which the air 3 is precipitated flows into the second container 5 through the liquid outlet pipeline 6. Since the liquid inlet level is higher than the liquid outlet level, the air 3 cannot flow out from the liquid outlet pipeline 6 when the water level in the closed cavity is not lower than the liquid outlet level. The weight change of the first container 2 and the second container 5 can be obtained by weighing the first container 2 and the second container 5 by the weighing device 7. The weight change of the first container 2 is the weight of the water corresponding to the volume of the dissolved air 3 released by the dissolved gas water in the closed cavity of the first container 2, and the volume of the air 3 released by the dissolved gas water can be obtained according to the weight change of the first container 2 (the density of water is 1 kg / L), and the weight change of the second container 5 is the weight of the dissolved gas water, and the volume of the dissolved gas water can be obtained according to the weight change of the second container 5 (the density of water is 1 kg / L), so that the dissolved gas concentration can be obtained according to the dissolved gas concentration = air volume / dissolved gas water volume (dissolved gas concentration (%) = (air volume / dissolved gas water volume) x 100%). The dissolved gas concentration monitoring device provided by the embodiment of the present application can quantitatively analyze the actual dissolved air amount in the dissolved gas water, so as to obtain the dissolved gas concentration. The dissolved gas concentration monitoring device provided by the embodiment of the present application can realize the effect of monitoring the dissolved gas concentration.

[0042] It can be understood that the dissolved gas concentration monitoring device provided by the embodiment of the present application is a differential pressure type air flotation system dissolved gas concentration monitoring device, which realizes quantitative measurement of the dissolved air concentration in the dissolved gas water, provides data support for standardization adjustment and optimization of the air flotation process, reduces the influence of human factors, and improves the operation stability. It can realize the effect of monitoring the dissolved gas concentration, and breaks through the limitation of indirect parameter control. Moreover, the monitoring of the dissolved gas concentration can be completed without professional skills, and the dependence on the operator is reduced.

[0043] For example, if the second container 5 changes by 10 kg, it can be considered that the weight of the dissolved air water delivered by the liquid inlet pipe 1 reaches 10 kg, and according to the density of the dissolved air water being approximately 1 kg / L, the volume of the dissolved air water can be obtained as 10 L. The weight change of the first container 2 can be the space occupied by the air 3 released by the dissolved air water in the original water in the first container 2, so the weight change of the first container 2 is the weight of the water discharged from the first container 2, and the volume of the water can be obtained according to the density of the water, and the volume of the water can be considered as the volume of the air 3 released by the dissolved air water. Therefore, according to the dissolved air concentration (%) = (air volume / dissolved air water volume (such as 10 L)) x 100%, the dissolved air concentration can be obtained.

[0044] As shown in Figure 1 The water 4 in the closed cavity of the first container 2 can be the water filled into the closed cavity before monitoring, the dissolved air water delivered by the liquid inlet pipe 1 into the closed cavity of the first container 2, or the mixed liquid of the water and the dissolved air water filled into the closed cavity, etc.

[0045] The weight change of the first container 2 and the weight change of the second container 5. The weight change of the first container 2 is the weight of the water corresponding to the volume of the dissolved air 3 released by the dissolved air water in the closed cavity of the first container 2, and the volume of the air 3 released by the dissolved air water can be obtained according to the weight change of the first container 2 (the density of water is 1 kg / L), and the weight change of the second container 5 is the weight of the dissolved air water, and the volume of the dissolved air water can be obtained according to the weight change of the second container 5 (the density of water is 1 kg / L), so the dissolved air concentration can be obtained according to the dissolved air concentration (%) = (air volume C / dissolved air water volume) x 100%. The dissolved air concentration monitoring device provided by the embodiment of the application can quantitatively analyze the actual dissolved air amount in the dissolved air water, so as to obtain the dissolved air concentration.

[0046] In order to ensure the sealing effect of the closed cavity, the first container 2 comprises a conical bottle 21 and a closure 22 for sealing the bottle mouth, wherein the small end of the conical bottle 21 is the bottle mouth, and the bottle mouth is arranged downwardly; the closure 22 has a first opening for the output end of the liquid inlet pipeline 1 to enter the closed cavity and a second opening for the liquid inlet end of the liquid outlet pipeline 6 to enter the closed cavity. Through the above arrangement, the size of the bottle mouth is small, and the bottle mouth is easily sealed by the closure 22. The closure 22 can be a bottle plug, which is partially embedded in the inside of the bottle mouth to seal the bottle mouth. The closure 22 can also be a cap or a bottle cap on the bottle mouth. The first opening and the second opening can be arranged on the closure 22, the output end of the liquid inlet pipeline 1 passes through the first opening to enter the closed cavity, and the output end of the liquid inlet pipeline 1 corresponds to the liquid inlet level (for example, the output end of the liquid inlet pipeline 1 is aligned with the liquid inlet level in the horizontal direction or the output end of the liquid inlet pipeline 1 reaches the liquid inlet level). The liquid inlet end of the liquid outlet pipeline 6 passes through the second opening to enter the closed cavity, and the liquid inlet end of the liquid outlet pipeline 6 corresponds to the liquid outlet level (for example, the liquid inlet end of the liquid outlet pipeline 6 is aligned with the liquid outlet level in the horizontal direction or the liquid inlet end of the liquid outlet pipeline 6 reaches the liquid outlet level).

[0047] In some embodiments, the liquid inlet level can be located at the bottom of the conical bottle 21. That is, the bottom of the conical bottle 21 is the highest position of the conical bottle 21 in the vertical direction. Through the above arrangement, the water in the conical bottle 21 (closed cavity) is effectively prevented from flowing out through the liquid inlet pipeline 1.

[0048] In order to facilitate observation of the bubble precipitation state, the conical bottle 21 is a transparent bottle body or has a transparent observation window. The conical bottle 21 can be made of transparent materials such as transparent glass materials. The conical bottle 21 can also be made of other non-transparent materials, and a transparent observation window made of transparent materials can be arranged on the conical bottle 21.

[0049] The dissolved gas concentration is monitored under the condition that the change amount of the second container 5 is 10 kg, and the volume of the conical bottle 21 (closed cavity) is not less than 10 L (for example, 15 L).

[0050] In order to simplify the structure of the dissolved gas concentration monitoring device and reduce the cost, the number of weighing devices 7 can be one; wherein the second container 5 and the first container 2 are movably arranged on the weighing device 7 for weighing. That is, the second container 5 and the first container 2 are weighed respectively to obtain the change amount of the weight of the second container 5 and the first container 2.

[0051] Of course, at least two weighing devices 7 can also be arranged to weigh the second container 5 and the first container 2 respectively.

[0052] For the convenience of weighing, the weighing device 7 is a platform scale, which has a support surface for placing the first container 2 and the second container 5. By placing the first container 2 on the support surface of the platform scale, the first container 2 is weighed. By placing the second container 5 on the support surface of the platform scale, the second container 5 is weighed. The accuracy of the platform scale is not less than 0.01 kg, which is used to weigh the first container 2 and the second container 5.

[0053] The second container 5 can also be a conical structure bottle, the small end of which is a bottle opening and is placed upward.

[0054] In order to facilitate the control of water into the first container 2, the liquid inlet pipeline 1 has a first on-off valve for controlling the on-off and flow rate. A second on-off valve for controlling the on-off and flow rate can also be provided on the liquid outlet pipeline 6, so as to control the water flowing out of the first container 2.

[0055] As shown in Figure 1 and Figure 2 The embodiment of the present application also provides a dissolved gas concentration monitoring method, which applies the dissolved gas concentration monitoring device of any one of the above, and comprises the following steps:

[0056] S1: preparation before monitoring, filling water in the closed cavity of the first container 2, weighing the first container 2 and recording the initial weight X; wherein the filled water can fill the closed cavity, or can fill part of the closed cavity. The water level of the filled water needs to be between the liquid inlet level and the liquid outlet level, so as to avoid the filled water in the closed cavity flowing out through the liquid inlet pipeline 1, and also avoid the air in the closed cavity flowing out through the liquid outlet pipeline 6.

[0057] S2: dissolved gas water introduction and bubble precipitation, the dissolved gas water is transported into the closed cavity through the liquid inlet pipeline 1, so that the dissolved gas water can release the dissolved air 3 in the closed cavity, and the water filled in the closed cavity and the water after the dissolved gas water precipitates the air 3 flows into the second container 5 through the liquid outlet pipeline 6;

[0058] S3: calculating the dissolved gas concentration, when the water after the dissolved gas water precipitates the air 3 reaches the target weight K, the transportation of the dissolved gas water is stopped, the first container 2 is weighed and the current weight B is recorded, the air volume in the closed cavity of the first container 2 is obtained according to the initial weight X and the current weight B, the dissolved gas water volume is obtained according to the target weight K, and the dissolved gas concentration (%) = (air volume / dissolved gas water volume) x 100% is obtained according to the dissolved gas concentration.

[0059] The change amount of the weight of the first container 2 is the weight of the water corresponding to the volume of the released air 3 in the closed cavity of the first container 2, and the change amount of the weight of the second container 5 is the weight of the dissolved air water, so that the dissolved air concentration can be obtained according to the dissolved air concentration (%)=(air volume / dissolved air water volume) x 100%. Through the dissolved air concentration monitoring method provided by the embodiment of the application, the actual dissolved air amount in the dissolved air water can be quantitatively analyzed, so that the dissolved air concentration is obtained. Through the dissolved air concentration monitoring device provided by the embodiment of the application, the effect of monitoring the dissolved air concentration can be achieved.

[0060] When the water in the second container 5 reaches the target weight K after the dissolved air water releases the air 3, the dissolved air water is stopped. That is, the dissolved air water is quantitatively (target weight K) monitored to release the air 3.

[0061] Further, in the preparation step before monitoring, the closed cavity of the first container 2 is filled with water, and the liquid level is located at the bottom of the conical bottle 21 of the first container 2. Through the above setting, the amount of the air 3 released by the dissolved air water in the closed cavity of the first container 2 can be as much as possible, so that the monitoring accuracy is improved.

[0062] In order to facilitate dynamic monitoring of the dissolved air concentration of the dissolved air tank at different liquid levels, a "liquid level-dissolved air concentration" corresponding relationship can be established. Therefore, the dissolved air concentration monitoring method provided by the embodiment of the application further comprises the following steps of associating the liquid level of the dissolved air tank with the dissolved air concentration of the dissolved air water in the dissolved air tank:

[0063] The pressure in the dissolved air tank is constant, that is, the pressure of the compressed air in the dissolved air tank is constant. On this basis, the dissolved air water in the dissolved air tank is transported into the closed cavity through the liquid inlet pipeline 1, the dissolved air concentration of the dissolved air water at different liquid levels in the dissolved air tank is monitored, and the corresponding relationship between the liquid level and the dissolved air concentration is established. Among them, the dissolved air concentration of the dissolved air water at different liquid levels is obtained through the above steps S2 and step S3 (or steps S1, S2 and S3) respectively, and then the corresponding relationship between the liquid level and the dissolved air concentration is established.

[0064] It can be understood that the constant pressure only ensures that the theoretical saturated gas-liquid amount is constant (according to Henry's law), but the actual gas-liquid effect that can be achieved is also affected by many other factors. The pressure determines the "upper limit of potential" of the gas-liquid water, but whether this upper limit can be reached also depends on other conditions, such as the liquid level. Among them, the liquid level is too high, which may cause the water outlet speed to be slow or the water inlet to be too much, resulting in an increase in gas-liquid time, so that the gas-liquid concentration is too high. The liquid level is too low, which may cause the water outlet speed to be fast or the water inlet to be insufficient, resulting in a decrease in gas-liquid time, so that the gas-liquid concentration is too low.

[0065] Due to the lack of quantitative data support, there is no standardized basis for process adjustment, and it is difficult to form a systematic optimization scheme. When air flotation appears abnormity (such as mud running, treatment efficiency decreasing), it is difficult to trace whether it is caused by abnormal gas-liquid concentration through data, and it is difficult to investigate and improve. Therefore, in order to facilitate the data tracing whether it is caused by abnormal gas-liquid concentration, reduce the difficulty of investigation and improvement, when the process conditions are stable, it can be obtained:

[0066] The gas-liquid concentration is too high (such as > 15%): the gas bubbles in the air flotation tank are dense, which may cause the sludge to be too thick and the water content to be too much, affecting the subsequent sludge treatment;

[0067] The gas-liquid concentration is too low (such as < 5%): the amount of gas bubbles is insufficient, the suspended solids cannot be effectively floated, the air flotation runs poorly, and the mud running phenomenon appears;

[0068] The optimal gas-liquid concentration range (such as 8%-12%): the air flotation runs well, the sludge is compact, and the effluent is clear.

[0069] Therefore, the above data can provide a clear direction for air flotation process optimization: when the operation is abnormal, the gas-liquid concentration can be monitored in real time to determine whether the operation is abnormal due to insufficient or excessive gas-liquid, and then the liquid level or air pressure of the gas-liquid tank can be adjusted accordingly.

[0070] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0071] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dissolved gas concentration monitoring device, characterized by, The application relates to a dissolved air concentration monitoring device, comprising: a first container (2) having a closed cavity and an inlet liquid level and an outlet liquid level in the closed cavity, wherein the inlet liquid level is higher than the outlet liquid level; an inlet liquid pipeline (1) for delivering dissolved air water into the closed cavity, wherein the output end of the inlet liquid pipeline (1) corresponds to the inlet liquid level, and the dissolved air water delivered into the closed cavity can release dissolved air (3); an outlet liquid pipeline (6) for discharging water in the first container (2), wherein the inlet end of the outlet liquid pipeline (6) corresponds to the outlet liquid level; a second container (5) in communication with the outlet end of the outlet liquid pipeline (6), wherein the water releasing air (3) can flow into the second container (5) from the outlet liquid pipeline (6); a weighing device (7) for weighing the first container (2) and the second container (5).

2. The dissolved gas concentration monitoring apparatus of claim 1, wherein The first container (2) comprises: a conical bottle (21) with a bottle mouth at the small end, wherein the bottle mouth is arranged downward; a closure (22) for blocking the bottle mouth, wherein the closure (22) has a first aperture for the output end of the inlet liquid pipeline (1) to enter the closed cavity and a second aperture for the inlet end of the outlet liquid pipeline (6) to enter the closed cavity.

3. The dissolved gas concentration monitoring apparatus of claim 2, wherein The inlet liquid level is located at the bottle bottom of the conical bottle (21).

4. The dissolved gas concentration monitoring apparatus of claim 2, wherein The conical bottle (21) is a transparent bottle body or has a transparent observation window.

5. The dissolved gas concentration monitoring apparatus of claim 1 wherein, The number of the weighing device (7) is one; The second container (5) and the first container (2) are movably arranged on the weighing device (7) for weighing.

6. The dissolved gas concentration monitoring apparatus of claim 5, wherein The weighing device (7) is a platform scale having a support surface for placing the first container (2) and the second container (5).

7. The dissolved gas concentration monitoring apparatus of claim 1 wherein, The inlet liquid pipeline (1) is provided with a first on-off valve for controlling the opening and closing and flow rate; and / or the outlet liquid pipeline (6) is provided with a second on-off valve for controlling the opening and closing and flow rate.

8. A method of monitoring the concentration of dissolved gas, characterized by, The application also discloses a monitoring method of the dissolved air concentration monitoring device. The monitoring method comprises the following steps: preparation before monitoring, filling water in the closed cavity of the first container (2), weighing the first container (2) and recording the initial weight X; dissolved air water introduction and bubble release, delivering the dissolved air water into the closed cavity from the inlet liquid pipeline (1) so that the dissolved air water can release dissolved air (3) in the closed cavity, and flowing the water filled in the closed cavity and the water after the dissolved air water releases air (3) into the second container (5) from the outlet liquid pipeline (6); calculating the dissolved air concentration, stopping the delivery of the dissolved air water when the water after the dissolved air water releases air (3) and flows into the second container (5) reaches the target weight K, weighing the first container (2) and recording the current weight B, obtaining the air volume in the closed cavity of the first container (2) according to the initial weight X and the current weight B, obtaining the dissolved air water volume according to the target weight K, and obtaining the dissolved air concentration according to the dissolved air concentration = air volume / dissolved air water volume.

9. The dissolved gas concentration monitoring method as claimed in claim 8, wherein, In the monitoring preparation step, the closed cavity of the first container (2) is filled with water, and the liquid level is located at the bottom of the flask (21) of the first container (2).

10. The dissolved gas concentration monitoring method according to claim 8 or 9, characterized by, Also including the liquid level of the dissolved air tank is associated with the dissolved air concentration of the dissolved air water in the dissolved air tank: The pressure in the dissolved air tank is constant, and the dissolved air water in the dissolved air tank is transported into the closed cavity through the liquid inlet pipeline (1), and the dissolved air concentration of the dissolved air water at different liquid levels in the dissolved air tank is monitored, and the corresponding relationship between the liquid level and the dissolved air concentration is established.

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