Gas flux collecting device

Abstract

The utility model relates to the technical field of greenhouse gas monitoring, in particular to a gas flux collecting device which comprises a gas collecting hood and a sampling assembly, the sampling assembly comprises a cylinder body and a pressure relief mechanism, the top of the cylinder body is closed, the bottom of the cylinder body is communicated with the top of the gas-collecting hood, and the pressure relief mechanism is arranged in the cylinder body and divides the internal space of the cylinder body into a first gas chamber communicated with the gas-collecting hood and a second gas chamber deviating from the gas-collecting hood; a sampling pipe communicated with the first gas chamber and a gas escape pipe communicated with the second gas chamber are arranged on the outer side surface of the cylinder body, and the pressure relief mechanism can selectively communicate the first gas chamber with the second gas chamber, so that part of gas in the first gas chamber is discharged out of the sampling assembly through the gas escape pipe. According to the collecting device provided by the utility model, the gas collecting hood can be prevented from being jacked away from the water surface in the sewage treatment process, so that the accuracy of collected data is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of greenhouse gas monitoring, in particular to a gas flux collection device. Background Art

[0002] The gas flux collection device at the water-air interface is an important means to quantify the greenhouse gas flux released from water bodies to the atmosphere, and its monitoring data can provide a basis for evaluating the contribution of industrial production activities to the greenhouse effect of the atmospheric environment. Currently, the commonly used greenhouse gas flux monitoring methods mainly include the floating chamber method, the gradient method, the inverted funnel method, the TDLAS method, and the eddy covariance method, etc.; among them, the floating chamber method is the most widely used due to its advantages such as simple principle, convenient operation, and high monitoring accuracy.

[0003] The floating chamber method is a commonly used method for observing gas flux at the water-air interface. For example, a water surface greenhouse gas emission measurement floating chamber disclosed in a Chinese patent document with the application number CN201020540093.4 includes a measurement box body, a floating device is arranged outside the measurement box body, a fixing rope is connected to the measurement box body, a gas sample hole is arranged on the measurement box body, a tin foil reflective material layer covers the outer surface of the measurement box body, a measurement pipeline is communicated with the measurement box body through the gas sample hole, and a three-way valve is arranged on the measurement pipeline. There are two gas sample holes, and an instrument connected by a measurement pipeline is arranged between the two gas sample holes. It can collect carbon dioxide, methane and other gas samples to be measured emitted by the surface water body in a diffusion manner, collect the concentration of the gas samples to be measured in the measurement box body at regular intervals, and calculate the emission flux of the gas samples to be measured in the covered water area according to the change rate of the concentration with time. Generally speaking, when this measurement box body is set in a calm water area, the accuracy of the collected data meets the standard. However, when it is applied to the sewage treatment field, due to the need of the process operation in the sewage treatment process, aeration is carried out into the water body, which causes the air pressure in the measurement box body to rise suddenly, pushing the gas collection cover away from the water surface and allowing air to enter the gas collection cover, diluting the concentration of greenhouse gases in the gas collection cover, thus reducing the accuracy of the finally collected data. Summary of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a gas flux collection device, which solves the technical problem of low accuracy of the data collected in the sewage treatment field in the prior art.

[0006] (II) Technical Solutions

[0007] In order to achieve the above object, the main technical solutions adopted by the utility model include:

[0008] An embodiment of the utility model provides a gas flux collection device, including: a gas collection cover and a sampling assembly;

[0009] The sampling assembly includes: a cylinder body and a pressure relief mechanism. The top of the cylinder body is closed, and the bottom of the cylinder body is communicated with the top of the gas collection hood. The pressure relief mechanism is arranged inside the cylinder body and divides the inner space of the cylinder body into a first gas chamber communicated with the gas collection hood and a second gas chamber facing away from the gas collection hood;

[0010] A sampling pipe communicated with the first gas chamber and an escape pipe communicated with the second gas chamber are arranged on the outer side surface of the cylinder body. The pressure relief mechanism can selectively communicate the first gas chamber with the second gas chamber so that part of the gas in the first gas chamber is discharged from the sampling assembly through the escape pipe.

[0011] Optionally, the pressure relief mechanism includes: a partition piece and an isolation ball;

[0012] The partition piece is arranged on the inner wall of the cylinder body. A round hole is formed in the partition piece. The diameter of the round hole is smaller than the diameter of the isolation ball. The isolation ball is movably arranged on the round hole and is in clearance fit with the inner wall of the cylinder body.

[0013] Optionally, a sensor group is further arranged in the first gas chamber. The sensor group includes: a temperature sensor, a pressure sensor, and / or a humidity sensor.

[0014] Optionally, the sampling assembly further includes a control box. A flow sensor and a control circuit are arranged in the control box. The control circuit is communicatively connected with the sensor group and the flow sensor; the control box is provided with a gas dispersion port, and the flow sensor is communicated with the escape pipe or the gas dispersion port.

[0015] Optionally, a return pipe for receiving the gas sample analyzed by the analyzer is further arranged on the gas collection hood.

[0016] Optionally, the gas collection hood is a conical shell, and a connection port for communicating with the sampling assembly is arranged at the top of the conical shell.

[0017] Optionally, the connection port is detachably connected with the sampling assembly.

[0018] Optionally, the connection port is threadedly connected with the sampling assembly.

[0019] Optionally, a floating bag is arranged at the bottom of the conical shell, and an extension plate extending in the vertical direction is arranged at the bottom of the floating bag.

[0020] (III) Beneficial effects

[0021] The gas flux collection device provided by the present utility model includes a gas collection hood floating on the water surface. A sampling component is connected to the top of the gas collection hood; a first gas chamber and a second gas chamber separated by a pressure relief mechanism; the first gas chamber is connected to the top of the gas collection hood, and a sampling tube for an analyzer to collect gas samples is provided in the first gas chamber; an escape tube is provided in the second gas chamber.

[0022] When the air pressure in the first gas chamber is greater than the preset air pressure, the pressure relief mechanism of the above sampling component makes the first gas chamber communicate with the second gas chamber, so that part of the gas in the first gas chamber is discharged from the collection device through the escape tube, thereby preventing the gas collection hood from being lifted off the water surface, affecting the total amount of gas in the gas collection hood and the concentration of greenhouse gases, and further ensuring the accuracy of the data collected by it. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a gas flux collection device provided in the embodiment;

[0024] Figure 2 It is a schematic structural diagram of the sampling component provided in the embodiment;

[0025] Figure 3 It is a three-dimensional structural diagram of a gas flux collection device provided in the embodiment.

[0026]

Description of the Reference Numerals

[0027] 1. Gas collection hood; 2. First gas chamber; 3. Second gas chamber; 4. Sampling tube; 5. Escape tube; 6. Cylinder body; 7. Partition; 8. Isolation ball; 9. Sensor group; 10. Control box; 11. Flow sensor; 12. Return air tube; 13. Floating bladder; 14. Extension plate; 15. First connection ring; 16. Second connection ring; 17. Clamping part; 18. Sampling valve; 19. Signal wire; 20. Fixed plate. Detailed Embodiments

[0028] In order to better understand the above technical solutions, the exemplary embodiments of the present utility model will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present utility model can be understood more clearly and thoroughly, and the scope of the present utility model can be completely conveyed to those skilled in the art.

[0029] Embodiment 1:

[0030] As Figure 1 shown, the embodiment of the present utility model provides a gas flux collection device, including: a gas collection hood 1 and a sampling component;

[0031] The sampling assembly includes: a cylinder body 6 and a pressure relief mechanism. The top of the cylinder body 6 is closed, and the bottom of the cylinder body 6 is communicated with the top of the gas collecting hood 1. The pressure relief mechanism is arranged inside the cylinder body 6 and divides the internal space of the cylinder body 6 into a first air chamber 2 communicated with the gas collecting hood 1 and a second air chamber 3 facing away from the gas collecting hood.

[0032] A sampling pipe 4 communicated with the first air chamber 2 and an air escape pipe 5 communicated with the second air chamber 3 are arranged on the outer side surface of the cylinder body 6. The pressure relief mechanism can selectively communicate the first air chamber 2 with the second air chamber 3 so that part of the gas in the first air chamber 2 is discharged from the sampling assembly through the air escape pipe 5. Preferably, a sampling valve 18 is arranged on the sampling pipe 4. The sampling valve 18 is opened when the analyzer collects a gas sample from the first air chamber 2 and is closed at other times. The sampling pipe 4 can be set as a bent pipe to prevent wind and water.

[0033] When the air pressure in the first air chamber 2 is greater than the preset air pressure, the pressure relief mechanism communicates the first air chamber 2 with the second air chamber 3, and part of the gas in the first air chamber 2 is discharged from the collection device through the air escape pipe 5.

[0034] Based on the pressure relief mechanism of the above sampling assembly, the collection device provided in this embodiment can prevent the gas collecting hood 1 from being pushed away from the water surface, thereby preventing the gas in the gas collecting hood from exchanging with the outside world when the gas collecting hood 1 is pushed away from the water surface, affecting the total amount of gas and the greenhouse gas concentration in the gas collecting hood 1, and ensuring the accuracy of the collected data.

[0035] As Figure 2 As shown, in a specific implementation manner of this embodiment, the sampling assembly includes a vertically arranged cylinder body 6. The top of the cylinder body 6 is closed, and the bottom of the cylinder body 6 is communicated with the top of the gas collecting hood 1. The pressure relief mechanism is arranged inside the cylinder body 6 and transversely divides the internal space of the cylinder body 6 into a first air chamber 2 communicated with the gas collecting hood 1 and a second air chamber 3 away from the gas collecting hood 1.

[0036] Further specifically, the pressure relief mechanism includes: a separator 7 and an isolation ball 8; the separator 7 is disposed on the inner wall of the cylinder 6, and the separator 7 divides the inner space of the cylinder 6 into a first air chamber 2 and a second air chamber 3. A round hole is formed in the separator 7, and the diameter of the round hole is smaller than the diameter of the isolation ball 8. The isolation ball 8 is movably disposed on the round hole and is in clearance fit with the inner wall of the cylinder 6. The isolation ball 8 is movably disposed in the round hole of the separator 7. When the gas pressure in the first air chamber 2 is less than or equal to the self-weight of the isolation ball 8, the isolation ball 8 is clamped on the round hole under the action of gravity. When the pressure of the gas in the first air chamber 2 on the isolation ball 8 is greater than the self-weight of the isolation ball 8, the isolation ball 8 is pushed away from the round hole, so that the first air chamber 2 is communicated with the second air chamber 3. That is to say, the gravity received by the isolation ball 8 is the preset air pressure corresponding to the first air chamber 2, and its specific weight can be set according to actual use requirements.

[0037] Preferably, the cylinder 6 can be a circular cylinder, a square cylinder, a hexagonal cylinder or an octagonal cylinder. The clearance fit between the isolation ball 8 and the inner wall of the cylinder 6 means that the inner diameter or the inscribed circle diameter of the cylinder 6 is slightly larger than the diameter of the isolation ball 8, so as to limit the isolation ball to accurately fall back into the round hole on the separator 7 when the pressure in the first air chamber 2 is less than the self-weight of the isolation ball 8, and enable the gas in the first air chamber 2 to smoothly enter the second air chamber 3 through the gap between the isolation ball 8 and the inner wall of the cylinder 6. More preferably, the cylinder 6 is a circular cylinder.

[0038] Embodiment 2:

[0039] As Figure 2 shown, in order to further improve the accuracy of the data collected by the collection device, based on the collection device provided in Embodiment 1, a sensor group 9 is further provided in the first air chamber 2 of this embodiment. The sensor group 9 includes: a temperature sensor, a pressure sensor and a humidity sensor. The environmental data such as temperature, pressure and humidity in the first air chamber 2 collected by the sensor group 9 are used to correct the concentration data or flux data of the greenhouse gas measured by the analyzer later. The temperature sensor, the pressure sensor and the humidity sensor included in the sensor group 9 can be separately arranged or integrated on the same end.

[0040] In addition, the sampling assembly further includes a control box 10, where a flow sensor 11 and a control circuit are provided inside the control box 10; the control circuit is communicatively connected to the sensor group 9 and the flow sensor 11. Specifically, the control circuit is connected through a signal line 19. The flow sensor 11 is used to detect the gas flow discharged through the escape pipe 5. A gas dispersion port is provided on the control box 10. The first end (intake end) of the flow sensor 11 is communicated with the escape pipe 5, and the second end (outlet end) of the flow sensor 11 is communicated with the gas dispersion port on the control box 10. The total amount of gas collected by the flow sensor 11 is added to the total amount of gas in the first air chamber, which is the total amount of gas discharged from the water body covered by the gas collection hood. The flow sensor 11 ensures the accuracy of the total amount of gas collected by the collection device, thereby further improving the accuracy of the greenhouse gas concentration, total gas amount or other flux data collected by it.

[0041] It should be noted that the control circuit, the sensor group 9 and the flow sensor 11 involved in this embodiment are all physical mechanism components. Among them, existing known programs can be integrated in the control circuit. This embodiment does not involve any improvement and use of computer programs, and only provides the connection relationship between the control circuit, the sensor group 9 and the flow sensor 11.

[0042] More preferably, a return pipe 12 for receiving the gas sample analyzed by the analyzer is further provided on the gas collection hood 1. That is to say, after the analyzer extracts a certain amount of gas sample from the first air chamber 2 for analysis, the analyzed gas sample is then sent back into the gas collection hood 1 through the return pipe 12, ensuring that the behavior of collecting the gas sample will not affect the pressure and gas concentration in the gas collection hood 1, and further ensuring the accuracy of the final greenhouse gas concentration or flux data. Similar to the sampling pipe 4, a return gas valve is provided on the return pipe. The return gas valve is opened when the analyzer sends the gas sample back into the gas collection hood 1 and is closed at other times to prevent the gas in the gas collection hood 1 from exchanging with the outside gas. A fixing plate 20 may also be provided on the gas collection hood 1. The fixing plate 20 is provided with mounting holes for fixedly installing the collection device provided in this embodiment on an anchor platform or a hoisting device.

[0043] It should be noted that the analyzer involved in this embodiment is used to analyze the concentration of greenhouse gases in the gas sample, and specifically may have the function of measuring the concentration of one or more greenhouse gases such as carbon dioxide, methane, nitrous oxide, etc. The analyzer body can use existing instruments. The intake port of the analyzer is communicated with the sampling pipe of the sampling assembly in this embodiment through a hose, and the outlet port of the analyzer is communicated with the return pipe of the gas collection hood provided in this embodiment through a hose.

[0044] Specifically, as Figure 3As shown, the gas collecting hood 1 is a conical shell, and a connection port for connecting the sampling assembly is provided at the top of the conical shell. The conical shell can be a conical shape or a pyramid shape, which facilitates the gas in the gas collecting hood 1 to converge upward along the gas collecting hood 1 and enter the first gas chamber 2. A floating bladder 13 is provided at the bottom of the conical shell, and an extension plate 14 extending in the vertical direction is provided at the bottom of the floating bladder 13. The shape enclosed by the extension plate 14 can be matched with the shape of the bottom of the floating bladder 13 to facilitate gas collection and improve the stability of the gas collecting hood 1 on the water surface.

[0045] The connection port of the gas collecting hood 1 can be detachably connected to the sampling assembly, so as to facilitate the installation and disassembly of the sampling device during use, handling and debugging, and reduce the occupation of space.

[0046] Preferably, the connection port is threadedly connected to the sampling assembly. More specifically, the sampling assembly can be detachably connected to the gas collecting hood 1 through a connecting member. The connecting member includes a first connecting ring 15 and a second connecting ring 16. A convex edge is provided on the outer side wall of the lower end of the cylinder body 6. The upper end of the first connecting ring 15 is provided with a limiting ring that cooperates with the convex edge. The inner diameter of the limiting ring is larger than the outer diameter of the cylinder body 6 and smaller than the outer diameter of the convex edge. The first connecting ring 15 is slidably sleeved on the outer side of the lower end of the cylinder body 6 through the limiting ring. The inner side surface of the first connecting ring 15 is provided with a first thread, and the outer side surface of the second connecting ring 16 is provided with a second thread that cooperates with the first thread. The lower end of the second connecting ring 16 bulges to form a clamping portion 17. The upper end of the second connecting ring 16 passes through the gas collecting hood 1 and is threadedly connected to the first connecting ring 15, and the gas collecting hood 1 is clamped between the clamping portion 17 and the first connecting ring 15.

[0047] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and defined, when a first feature is "on" or "under" a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is "above", "over" and "on top of" a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it merely means that the horizontal height of the first feature is higher than that of the second feature. When a first feature is "under", "below" and "beneath" a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it merely means that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples", etc., mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0050] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A gas flux collection device, characterized in that, Comprising: A gas collection hood (1) and a sampling assembly; The sampling assembly includes: a cylinder body (6) and a pressure relief mechanism. The top of the cylinder body (6) is closed, the bottom of the cylinder body (6) is communicated with the top of the gas collection hood (1), the pressure relief mechanism is arranged inside the cylinder body (6), and divides the internal space of the cylinder body (6) into a first gas chamber (2) communicated with the gas collection hood (1) and a second gas chamber (3) facing away from the gas collection hood (1); A sampling pipe (4) communicated with the first gas chamber (2) and an exhaust pipe (5) communicated with the second gas chamber (3) are arranged on the outer side surface of the cylinder body (6). The pressure relief mechanism can selectively communicate the first gas chamber (2) with the second gas chamber (3) so that part of the gas in the first gas chamber (2) is discharged from the sampling assembly through the exhaust pipe (5).

2. The acquisition device according to claim 1, wherein The pressure relief mechanism includes: a partition piece (7) and an isolation ball (8); The partition piece (7) is arranged on the inner wall of the cylinder body (6). A round hole is formed in the partition piece (7). The diameter of the round hole is smaller than the diameter of the isolation ball (8). The isolation ball (8) is movably arranged on the round hole and is in clearance fit with the inner wall of the cylinder body (6).

3. The acquisition device according to claim 1, wherein The first gas chamber (2) is also provided with a sensor group (9). The sensor group (9) includes: a temperature sensor, a pressure sensor and / or a humidity sensor.

4. The acquisition device according to claim 3, characterized in that, The sampling assembly also includes a control box (10). A flow sensor (11) and a control circuit are arranged in the control box (10). The control circuit is communicatively connected with the sensor group (9) and the flow sensor (11); The control box (10) is provided with a gas dispersion port. The flow sensor (11) is communicated with the exhaust pipe (5) or the gas dispersion port.

5. The acquisition device according to claim 1, characterized in that, A return air pipe (12) is also arranged on the gas collection hood (1).

6. The acquisition device according to claim 1, wherein The gas collection hood (1) is a conical shell. A connection port for communicating with the sampling assembly is arranged at the top of the conical shell.

7. The acquisition device according to claim 6, wherein The connection port is detachably connected with the sampling assembly.

8. The acquisition device according to claim 7, characterized in that, The connection port is threadedly connected with the sampling assembly.

9. The acquisition device according to claim 6, characterized in that, A floating bladder (13) is arranged at the bottom of the conical shell. An extension plate (14) extending in the vertical direction is arranged at the bottom of the floating bladder (13).

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