Gas sampling device for measuring flux of greenhouse gas in water body

Abstract

The utility model discloses a gas sampling device for measuring the flux of greenhouse gas in a water body. The gas sampling device comprises a floating table and a manual sampling chamber, the floating table comprises a floating body, a water seal tank and a flux ring, the floating body provides buoyancy, the water seal tank forms air-tight seal through water injection, and the flux ring is used for being matched with the automatic flux chamber. The floating body is provided with hollow holes, and water-gas interface substance exchange is achieved. The manual sampling chamber is of a bottomless columnar structure and comprises a barrel, a top cover, a gas sampling port and a gas pressure balance port, and the lower end of the manual sampling chamber can be inserted into the water seal tank to form gas seal. The gas sampling port is connected with sampling equipment or a laser spectrometer, and the gas pressure balance port maintains pressure balance. The floating table and the manual sampling chamber are designed in a modularized and separable mode, and after the manual sampling chamber is detached, the flux ring can be provided with an automatic flux chamber for measurement. The device is modularized and separable in design, flexible in multi-combination mode, suitable for various application scenes, compact in structure, convenient to carry and install and suitable for in-situ monitoring and research of water body greenhouse gas flux.

Description

TECHNICAL FIELD

[0001] The utility model relates to greenhouse gas monitoring technical field especially is related to a gas sampling device for water body greenhouse gas flux determination. BACKGROUND

[0002] The release of water body greenhouse gases (such as carbon dioxide, methane and nitrous oxide) is an important source of global greenhouse gas emissions. The existing water body greenhouse gas flux determination equipment is usually bulky, and the operation is complex, which is not convenient for field operation. At the same time, the traditional equipment usually lacks light and modular design, and is difficult to adapt to complex field environment. Therefore, it is of great significance to develop a light and flexible, modular and suitable for multi-scene water body greenhouse gas sampling device.

[0003] It should be noted that the information disclosed in the above background section is only for understanding the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to overcome the defects in the above background technology, and provide a gas sampling device for water body greenhouse gas flux determination.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A gas sampling device for water body greenhouse gas flux determination, comprising:

[0007] The floating platform comprises a floating main body, a water seal groove and a flux ring, the floating main body provides buoyancy, the water seal groove is provided at the top of the floating main body and is composed of two protruding concentric circles, and a reliable airtight seal is formed by water injection, and the flux ring is arranged inside the water seal groove and is used for adapting an automatic flux chamber for determination; The floating main body is provided with a hollow hole hole that penetrates up and down, the hollow hole hole is communicated with the flux ring, and a channel can be provided between water surface and air to realize water-gas interface mass exchange.

[0008] The manual sampling chamber is a columnar structure without bottom, comprising a hollow cylinder, a top cover closing the upper part of the cylinder, a gas inlet and a gas pressure balance port arranged on the top cover; The lower end of the cylinder can be adaptively inserted into the water seal groove, and an airtight seal is formed between the floating platform and the water seal groove after water injection; The gas inlet is used for connecting a sampling device or a laser spectrum gas concentration analyzer, and the gas pressure balance port is used for maintaining the pressure balance inside and outside the sampling chamber.

[0009] The floating platform and the manual sampling chamber are configured as a modular separable design, and when the manual sampling chamber is detached from the floating platform, an automatic flux chamber can be docked and installed through the flux ring to perform automatic flux determination.

[0010] Further, the convex height of the concentric ring of the water seal groove is 25-35mm.

[0011] Further, the flux ring is detachable and is a convex circular ring with a convex height of 30-100mm, an inner diameter of 200-210mm and a thickness of 5-10mm.

[0012] Further, the height of the cylinder of the manual sampling chamber is 100-300mm.

[0013] Further, the water seal groove, the flux ring and the cylinder of the manual sampling chamber are made of acrylic or PVC material.

[0014] Further, a gas sampling hose is detachably connected to the gas sampling port on the top cover of the manual sampling chamber, and the gas sampling hose is connected to a gas sampling syringe through a tee valve with a luer connector.

[0015] Further, a gas pressure balancing pipe with a length of not less than 1.5m is detachably connected to the gas pressure balancing port on the top cover of the manual sampling chamber.

[0016] Further, two portable handles are arranged on the top of the manual sampling chamber.

[0017] Further, a gas mixing fan is arranged inside the top cover of the manual sampling chamber, and the gas mixing fan is kept at a distance of more than 30mm from the top cover to fully mix the gas in the manual sampling chamber.

[0018] Further, a battery box assembly is arranged in the manual sampling chamber to supply power to the gas mixing fan.

[0019] The utility model has the following beneficial effects:

[0020] The utility model provides a gas sampling device for water body greenhouse gas flux determination, and its main technical advantages lie in innovative modular design and multifunctionality. The device mainly comprises a floating platform and a manual sampling chamber, the floating platform provides buoyancy through a floating main body and is equipped with a water seal groove and a flux ring, can realize reliable airtightness, supports connection of an automatic flux chamber and exchange of water-gas interface substances, the manual sampling chamber is a bottomless columnar structure, is provided with a gas sampling port, a gas pressure balancing port and an integrated gas mixing fan and battery box assembly inside, can be quickly combined or separated with the floating platform to form a flexible sampling system.

[0021] The gas sampling device with the innovative modular design not only realizes separability of the floating platform and the manual sampling chamber, but also supports multiple combination modes and use scenarios.

[0022] In addition, the gas sampling device has compact structure, convenient operation, good air tightness and is suitable for long-term field monitoring.

[0023] To sum up, the gas sampling device with the modular design, separable multiple combinations and diversified use modes realizes efficient, flexible and convenient greenhouse gas flux determination of water bodies, and provides an ideal solution for in-situ monitoring and research of greenhouse gas fluxes of water bodies.

[0024] Other beneficial effects of the embodiments of the present application will be further described in the following. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1A and Figure 1B are respectively a perspective view and a top view of the floating platform of the embodiments of the present application.

[0026] Figure 2A is a perspective view of the manual sampling chamber of the embodiments of the present application.

[0027] Figure 2B is another perspective view of the manual sampling chamber of the embodiments of the present application.

[0028] Figure 3 is an exploded view of the floating platform and the manual sampling chamber of the embodiments of the present application. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail below. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the present application and its applications.

[0030] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for fixing or for coupling or communicating.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0032] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0033] Referring to Figures 1A to 3 The utility model embodiment provides a kind of gas sampling device for water greenhouse gas flux determination, including floating platform and manual sampling chamber;The floating platform includes floating main body 1, water seal groove 2 and flux ring 3, the floating main body 1 provides buoyancy, the water seal groove 2 is set at the top of the floating main body 1, is formed by two circles of protruding concentric rings, reliable airtight seal is formed by water injection, the flux ring 3 is set in the inside of the water seal groove 2, for adapting automatic flux chamber to determine;The floating main body 1 is equipped with hollow hole from top to bottom, the hollow hole is communicated with the flux ring 3, can provide passage between water surface and air, to realize water-gas interface material exchange;The manual sampling chamber is bottomless columnar structure, including hollow cylinder 4, top cover 5 that closes the upper portion of cylinder 4, gas inlet 6 and gas pressure balance port 7 that are set on the top cover 5;The lower end of the cylinder 4 can be adaptively inserted into the water seal groove 2, and form airtight seal with the floating platform after water injection in the water seal groove 2;The gas inlet 6 is used to connect sampling equipment or laser spectrum gas concentration analyzer, the gas pressure balance port 7 is used to maintain pressure balance inside and outside sampling chamber;The floating platform and the manual sampling chamber are configured into modular separable design, when the manual sampling chamber is unloaded from the floating platform, automatic flux chamber can be docked and installed through the flux ring 3 to carry out automatic flux determination.

[0034] Due to the adoption of the innovative modular design and separable structure, the gas sampling device has remarkable flexibility and multifunctionality. The separable design of the floating platform and the manual sampling chamber not only facilitates the carrying and installation of the device, but also supports multiple combination modes and use scenarios. The floating platform can be used alone with the flux ring for automatic flux determination, or combined with the manual sampling chamber for in-situ determination by needle sampling or laser spectrometer. Such diversified combination modes greatly improve the applicability and portability of the device, enabling it to meet different monitoring requirements and complex field environment requirements. In addition, the modular design also simplifies the maintenance and replacement process of the device, reducing the use cost. The floating platform has good air tightness, suitable for long-term field monitoring, and the high-integration design of the manual sampling chamber further improves the convenience of operation. In summary, the present utility model realizes efficient, flexible and convenient determination of water body greenhouse gas flux through modular design, separable multi-combination and diversified use modes, providing an ideal solution for in-situ monitoring and research of water body greenhouse gas flux.

[0035] The floating main body 1 is made of low-density waterproof material, providing sufficient buoyancy and good corrosion resistance, and can be deployed in fresh water or seawater environment. In the preferred embodiment, the convex height of the concentric circular ring of the water seal groove 2 is 25-35mm. The flux ring 3 is a detachable structure, which is a convex circular ring with a convex height of 30-100mm, an inner diameter of 200-210mm and a thickness of 5-10mm. The height of the cylinder body 4 of the manual sampling chamber is 100-300mm. The water seal groove 2, the flux ring 3 and the cylinder body 4 of the manual sampling chamber are made of acrylic or PVC material.

[0036] Preferably, the gas sampling port 6 of the manual sampling chamber is detachably connected with a gas sampling hose 12 on the top cover 5, and the gas sampling hose 12 is connected with a gas sampling syringe 13 through a three-way valve 11 with a luer connector. Preferably, the gas pressure balancing port 7 is detachably connected with a gas pressure balancing pipe on the top cover 5 of the manual sampling chamber, with a length not less than 1.5 meters. Two portable handles 8 are also provided on the top of the manual sampling chamber.

[0037] In the preferred embodiment, a gas mixing fan 10 is arranged inside the top cover 5 of the manual sampling chamber, which maintains a distance of more than 30mm from the top cover 5, for fully mixing the gas in the manual sampling chamber. A battery box assembly 9 is provided inside the manual sampling chamber to power the gas mixing fan 10.

[0038] The specific embodiments of the present utility model are further described below.

[0039] A gas sampling device for water greenhouse gas flux determination, comprising a floating platform and a manual sampling chamber. As shown in Figure 1A 、 Figure 1B and Figure 3 , the floating platform comprises a floating body 1, a water seal groove 2 and a flux ring 3, wherein the floating body 1 is made of corrosion-resistant waterproof material to provide long-term buoyancy of the device in water; the water seal groove 2 can form a reliable airtight seal by water injection; and the flux ring 3 is used to cooperate with the automatic flux chamber for determination. As shown in Figure 2A 、 Figure 2B and Figure 3 , the manual sampling chamber comprises a cylinder 4, a top cover 5, a gas sampling port 6, a gas pressure balance port 7, a portable handle 8, a battery box assembly 9, a gas mixing fan 10, a three-way valve with a luer connector 11, a gas sampling hose 12 and a gas sampling syringe 13. The gas sampling port 6 of the manual sampling chamber can be connected with a sampling needle for sampling, or can be used in cooperation with a laser spectrum gas concentration analyzer; the gas pressure balance port 7 is used to keep the pressure balance inside and outside the sampling chamber; the gas mixing fan 10 ensures the uniformity of the sampling gas, and the power required for its operation is provided by the battery box assembly 9; and the portable handle 8 facilitates the movement and operation of the device. The utility model has the advantages of compact structure, convenient operation, modular design facilitating carrying and installation, and is suitable for in-situ monitoring and research of water greenhouse gas flux.

[0040] Specifically, the floating body 1 is made of low-density waterproof material, has good corrosion resistance, can be deployed in fresh water or seawater environment, has a side length of not less than 450 mm, and can provide a buoyancy of not less than 20 kg. The water seal groove 2 is made of acrylic material, is located at the top of the floating body, is composed of two protruding concentric circles, the protruding height is 30 mm, the inner diameter of the outer acrylic ring is not less than the outer diameter of the manual sampling chamber, the outer diameter of the inner acrylic ring is not greater than the inner diameter of the manual sampling chamber, the manual sampling chamber can be inserted therein, and after water injection, a reliable airtight seal is formed. The flux ring is a detachable structure made of acrylic material, is a protruding circular ring, the protruding height is 30-100 mm, the inner diameter is 200 mm, and the outer diameter is 210-220 mm, which is used to adapt to the common automatic flux chamber on the market. The floating platform has a hollow hole with a diameter similar to the inner diameter of the flux ring, which can provide a channel between the water surface and the air without affecting the exchange of substances at the water-air interface, and the dissolved gas can diffuse into the air according to Henry's law. The manual sampling chamber is a columnar structure without a bottom column, which is made of PVC or acrylic material, the upper top cover is closed, and in addition to the gas sampling port and the gas pressure balancing port, the upper part can achieve effective airtightness. The height of the barrel of the sampling chamber is determined according to the discharge amount of the water surface gas to be measured, which is usually not less than 100 mm and not more than 300 mm. The gas sampling port is located at the center of the top cover of the manual sampling chamber, and a PVC gas sampling hose can be detachably connected. The length of the gas sampling hose is not more than 50 mm, which is connected with a gas sampling syringe through a three-way valve with a luer connector, and the solvent of the gas sampling syringe is 20-50 mL, which can be used for gas sampling. The gas pressure balancing port can be connected with a gas pressure balancing pipe to realize the pressure balance between the inside and outside of the sampling chamber. The gas pressure balancing pipe has a detachable property, and the length is not less than 1.5 meters, which satisfies the gas pressure balancing function while avoiding the exchange of gases inside and outside the device. A gas mixing fan 10 with a power of 2-4 W is hung inside the top cover of the manual sampling chamber, and the gas mixing fan maintains a distance of more than 30 mm from the top cover, which is used to generate disturbance inside the sampling chamber to ensure that the gas is fully mixed, thereby improving the sampling accuracy. The battery box assembly 9 can install three 18650 batteries to provide a voltage of 12 V, which can provide power for the gas mixing fan to work for not less than 10 hours. In addition, two portable handles are provided on the top of the manual sampling chamber to facilitate carrying and transporting. The floating platform can be combined with the manual sampling chamber or the automatic flux chamber to monitor the concentration of greenhouse gases in real time.

[0041] Application example:

[0042] Two combination modes of the floating platform were tested, one was the floating platform combined with the manual sampling chamber, and the other was the floating platform installed with the flux ring. Three application scenarios of the floating platform were tested: the first was the floating platform combined with the manual sampling chamber and the syringe for needle sampling, the second was the floating platform combined with the manual sampling chamber and the laser spectrometer for in-situ measurement, and the third was the floating platform combined with the flux ring and the automatic flux chamber for in-situ measurement.

[0043] (1) Preparation before flux measurement.

[0044] The device purposes include both manual gas sampling method and automatic flux measurement method. One of the two measurement methods needs to be determined before measurement, and the device needs to be adjusted according to the method. If the manual gas sampling is adopted, the manual sampling chamber needs to be matched, and the air pressure balance pipe needs to be installed at the air pressure balance port, and at the same time, the flux ring of the floating platform needs to be removed. If the automatic flux measurement method is adopted, the automatic flux chamber and the laser spectrum need to be matched, and at the same time, the flux ring needs to be installed on the floating platform, and the air tightness between the flux ring and the floating platform needs to be ensured.

[0045] (2) Device deployment.

[0046] Before the experiment is carried out, the floating platform is placed above the water surface to be measured. The water surface can be fresh water area or sea water area, including but not limited to rivers, lakes, oceans and the like. It should be ensured that the floating platform is placed horizontally, so that the water seal groove is above, and at the same time, the middle hole can realize water and air communication, without affecting the material exchange of water and air interface. The dissolved gas can spontaneously diffuse into the air.

[0047] (3) Manual gas sampling.

[0048] Turn on the power of the gas mixing fan built in the manual sampling chamber, clamp the manual sampling chamber in the water seal groove of the floating platform and ensure that the edge is inserted therein. After water is injected into the water seal groove (2) on the top of the floating platform, water seal can be effectively formed to reduce the entry of external gas into the sampling chamber and ensure air tightness. Record the time t. At t+60s, 30 ml of gas is collected through a needle tube with a luer connector and injected into a pre-evacuated gas sample bottle. Record the sample number and save it. Repeat the operation at t+60s at t+300s, t+600s, t+900s and t+1200s. Store the sample in the dark and take it back to the laboratory. The concentration of the sampled gas (carbon dioxide CO2, methane CH4, or nitrous oxide N2O) is measured by gas chromatography. According to the concentration and sampling time, the rate of change of gas concentration with time can be obtained. The rate of change can be used to calculate the exchange amount of greenhouse gases at the water-air interface.

[0049] (4) Automatic flux measurement.

[0050] Place the automatic flux chamber on the flux ring and ensure air tightness. Connect the inlet and outlet of the automatic flux chamber to the laser spectrum device that can measure the concentration of greenhouse gases. The real-time concentration can be directly measured by opening and closing the box of the automatic flux chamber. After the automatic flux chamber is closed, the automatic flux chamber and the flux ring form a sealed chamber. At this time, the laser spectrum can measure the gas concentration in the chamber in real time, and the rate of change of concentration with time can be obtained. The rate of change result can be used to calculate the exchange amount of greenhouse gases at the water-air interface.

[0051] The above is further detailed description of the utility model in combination with specific / preferred embodiments, and cannot be deemed as limitation of the specific implementation of the utility model to these descriptions. For ordinary skilled in the art to which the utility model belongs, without departing from the concept of the utility model, some substitutions or variations can be made to the described embodiments, and these substitutions or variations shall be deemed as falling within the protection scope of the utility model. In the description of the specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the case of not mutually contradictory, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples. Although the embodiments of the utility model and its advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made in this paper without departing from the protection scope of the patent application.

Claims

1. A gas sampling device for water body greenhouse gas flux determination, characterized in that, The application relates to a floating platform and a manual sampling chamber. The floating platform comprises a floating body, a water seal groove and a flux ring, the floating body provides buoyancy, the water seal groove is arranged at the top of the floating body and is composed of two protruding concentric rings, a reliable air-tight seal is formed by water injection, and the flux ring is arranged inside the water seal groove and is used for adapting an automatic flux chamber for measurement; the floating body is provided with a hollow hole penetrating from top to bottom, the hollow hole is communicated with the flux ring, a channel is provided between water and air to realize material exchange at the water-air interface; the manual sampling chamber is a bottomless columnar structure and comprises a hollow cylinder, a top cover closing the upper part of the cylinder, a gas sampling port and a gas pressure balance port arranged on the top cover; the lower end of the cylinder can be adaptively inserted into the water seal groove and forms an air-tight seal with the floating platform after water injection in the water seal groove; the gas sampling port is used for connecting a sampling device or a laser spectrum gas concentration analyzer, and the gas pressure balance port is used for maintaining pressure balance inside and outside the sampling chamber. The floating platform and the manual sampling chamber are configured in a modular separable design, when the manual sampling chamber is detached from the floating platform, an automatic flux chamber can be docked and installed through the flux ring to perform automatic flux measurement. The protruding height of the concentric ring of the water seal groove is 25-35 mm.

2. The gas sampling device of claim 1, wherein, The flux ring is a detachable structure, is a protruding ring, the protruding height is 30-100 mm, the inner diameter is 200-210 mm, and the thickness is 5-10 mm.

3. The gas sampling device of claim 1, wherein, The height of the cylinder of the manual sampling chamber is 100-300 mm.

4. The gas sampling device of claim 1, wherein, The water seal groove, the flux ring and the cylinder of the manual sampling chamber are made of acrylic or PVC material.

5. The gas sampling device of claim 1, wherein, A gas sampling hose is detachably connected to the gas sampling port on the top cover of the manual sampling chamber, the gas sampling hose is connected with a gas sampling syringe through a three-way valve with a luer connector.

6. The gas sampling device of claim 1, wherein, The gas pressure balance port is detachably connected with a gas pressure balance pipe on the top cover of the manual sampling chamber, and the length is not less than 1.5 m.

7. The gas sampling device of claim 1, wherein, Two portable handles are arranged on the top of the manual sampling chamber.

8. The gas sampling device of claim 1, wherein, A gas mixing fan is arranged inside the top cover of the manual sampling chamber, the gas mixing fan is kept at a distance of more than 30 mm from the top cover, and is used for fully mixing the gas in the manual sampling chamber.

9. The gas sampling device of claim 1, wherein, A battery box assembly is arranged in the manual sampling chamber and is used for supplying power to the gas mixing fan.

10. The gas sampling device of claim 9, wherein, ​

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