Dissolvable trace greenhouse gas collection and pretreatment device and method

Abstract

The invention discloses a soluble trace greenhouse gas collection and pretreatment device and method in the technical field of carbon emission monitoring and accounting, the device comprises a main body assembly, the main body assembly comprises a hollow tank body with a conical upper end, and the upper end of the tank body is sequentially connected with a liquid inlet pipe, a gas guide pipe and a negative pressure pipe. By means of the conical design of the tank body, gas gathering and guiding-out are facilitated, the gas collecting efficiency is improved, the liquid inlet assembly controls fluid to be guided into the tank body, the detection assembly monitors the pressure change in the tank body in real time, real-time vacuumizing data reading of the vacuumizing assembly is facilitated, and when the fluid is not guided into the tank body, the gas collecting efficiency is improved. The tank body and the gas collecting assembly are communicated through the vacuumizing assembly, and residual gas in the tank body and the gas collecting assembly is vacuumized, so that the influence of the residual gas on a subsequent trace non-carbon dioxide greenhouse gas detection result is avoided, the accuracy of the subsequent detection result is ensured, the gas component analysis precision is improved, and the use effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission monitoring and accounting, and specifically to a device and method for collecting and preprocessing dissolved trace greenhouse gases. Background Art

[0002] Non-carbon dioxide greenhouse gases (referred to as non-CO2 greenhouse gases), such as methane (CH4) and nitrous oxide (N2O), are important greenhouse gases in the atmosphere, and their single-molecule warming potentials are 27.9 and 298 times that of carbon dioxide (CO2), respectively. Water bodies contain abundant carbon and nitrogen elements, and CH4 and N2O can be produced through the carbon cycle and nitrogen cycle processes, which is an important way of direct carbon emissions. Therefore, the accurate monitoring of dissolved non-CO2 greenhouse gases in water bodies has become a key link in the process of carbon emission accounting.

[0003] The headspace equilibrium method is the mainstream pretreatment method currently used for the analysis and detection of dissolved gases in water bodies. This method oscillates the liquid sample to be measured in a closed container to make the components to be measured in the liquid phase and the headspace of the container reach an equilibrium state. Subsequently, the concentration of the gas-phase components in the headspace is measured, and the concentration of each component in the sample to be measured is calculated based on Henry's law. However, there are problems such as the lack of pretreatment equipment for dissolved trace gas water samples, the non-standard pretreatment operation method, and the easy contamination of samples by environmental gases, resulting in large errors and low precision in the subsequent gas component analysis, which cannot meet the accurate quantitative analysis of dissolved trace non-CO2 greenhouse gases in water bodies. Moreover, the time for ordinary dissolved gas analysis and detection devices in water bodies to precipitate trace non-CO2 greenhouse gases is relatively long, and the precipitation in the fluid is not thorough enough, affecting the final detection result and the use effect is not good. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for collecting and preprocessing dissolved trace greenhouse gases to solve the problems of easy contamination of samples by environmental gases, relatively long time for ordinary dissolved gas analysis and detection devices in water bodies to precipitate trace non-CO2 greenhouse gases, and incomplete precipitation in the fluid, resulting in large errors and low precision in the subsequent gas component analysis.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, the present invention provides a device for collecting and preprocessing dissolved trace greenhouse gases, including: A main body component, the main body component includes a tank body that is hollow and has a conical upper end. The upper end of the tank body is sequentially connected with a liquid inlet pipe, a gas guide pipe, and a negative pressure pipe. The tank body is used for storing fluid and precipitating greenhouse gases; A liquid inlet component, the liquid inlet component is connected to the liquid inlet pipe, and the liquid inlet pipe is used for introducing fluid; A gas collection component, the gas collection component is connected to the gas guide pipe, and the gas collection component is used for collecting gas; Detection component, the detection component is installed at the upper end of the tank body; the detection component is used for pressure detection; Vacuum pumping component, the vacuum pumping component is connected to a negative pressure pipe, and the vacuum pumping component is used to form a negative pressure environment inside the tank body to reduce gas pollution and assist the fluid in precipitating greenhouse gases.

[0006] As a further solution of the present invention: the vacuum pumping component includes a valve body, a negative pressure middle pipe and an air extraction pipe. The valve body is connected to the negative pressure pipe. One end of the negative pressure middle pipe is connected to the upper end of the tank body. A limiting ring is connected to the inner wall of the negative pressure middle pipe. A piston is movably connected inside the negative pressure middle pipe. The other end of the negative pressure middle pipe is connected to a sealing valve. The air extraction pipe is sequentially connected to the valve body and the sealing valve. The air extraction pipe is used to connect an external vacuum pumping device. The air extraction pipe and the valve body are used to evacuate the tank body before introducing the fluid to reduce gas pollution. The air extraction pipe and the negative pressure middle pipe are used to precipitate greenhouse gases after introducing the fluid.

[0007] As a further solution of the present invention: a plurality of annular sealing strips are sleeved on the piston, and the plurality of sealing strips are equidistantly arranged on the piston.

[0008] As a further solution of the present invention: the liquid inlet component includes a liquid inlet needle body, a sealing plug is penetrated and connected on the liquid inlet needle body, the liquid inlet needle body is hermetically connected inside the liquid inlet pipe through the sealing plug, the other end of the liquid inlet needle body is connected to a liquid inlet three-way valve, one end of the liquid inlet three-way valve is connected to a filter, the filter is connected to a liquid inlet rubber tube, and the liquid inlet three-way valve is used for discharging the gas inside the liquid inlet rubber tube and controlling the introduction of the fluid into the liquid inlet needle body.

[0009] As a further solution of the present invention: the gas collection component includes a gas guiding needle body and a gas collection bag. A sealing plug is penetrated and connected on the gas guiding needle body, the gas guiding needle body is hermetically connected inside the liquid inlet pipe through the sealing plug, one end of the gas guiding needle body is connected to a gas guiding three-way valve, the gas guiding three-way valve is connected to the gas collection bag, and the gas collection bag is used for collecting gas.

[0010] As a further solution of the present invention: the detection component includes a pressure sensor, the pressure sensor is connected to the upper end of the tank body, and the pressure sensor is used for detecting the internal pressure of the tank body.

[0011] As a further solution of the present invention: the detection component further includes a temperature sensor and a liquid level sensor. The temperature sensor and the liquid level sensor are both connected to the upper end of the tank body. The temperature sensor is used for detecting the internal temperature of the tank body, and the liquid level sensor is used for detecting the internal liquid level of the fluid in the tank body to obtain the internal fluid capacity of the tank body.

[0012] As a further solution of the present invention: It further includes an oscillation assembly. The oscillation assembly includes a bottom plate. The bottom end of the tank body is connected with a bridge end. The upper end surface of the bottom plate is connected with a connecting shaft. The connecting shaft penetrates and is movably connected to the middle of the bridge end. The bottom of the bridge end is movably connected with a connecting rod. The other end of the connecting rod is movably connected with an eccentric wheel. The eccentric wheel is movably connected to the upper end surface of the bottom plate. The eccentric wheel is connected to an external power device. A limiting component is installed on the bottom plate. The oscillation assembly is used for the oscillation and swing of the tank body, and the limiting component is used for abutting and limiting the tank body.

[0013] As a further solution of the present invention: The limiting component includes limiting claws and a limiting block. A plurality of limiting claws are fixedly connected to the bottom plate. A plurality of groups of clamping grooves are formed inside the limiting block. The limiting claws are clamped and installed in the clamping grooves inside the limiting block. The limiting claws are used for vertically moving and limiting the clamping of the limiting block. The limiting block is used for abutting and limiting the tank body and limiting the oscillation and swing. The two sides of the bottom end of the bridge end are arc-shaped surfaces. The abutting and limiting end of the limiting block matches the bottom end of the bridge end.

[0014] In a second aspect, the present invention provides a method for collecting and pre-treating dissolved trace greenhouse gases, including the following steps: When the fluid is not injected into the tank body in the main body assembly, connect the gas collection assembly to the tank body; Form a negative pressure environment inside the tank body through the vacuum pumping assembly. Observe that the negative pressure value inside the tank body reaches the preset value through the detection assembly, and then close the gas collection assembly to reduce the gas pollution of the tank body and the gas collection assembly; Introduce the fluid to be pre-treated into the tank body through the liquid inlet assembly, and then form a negative pressure environment inside the tank body through the vacuum pumping assembly to assist the fluid in precipitating greenhouse gases; Collect the precipitated greenhouse gases through the gas collection assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, the conical design of the tank body is beneficial to the aggregation and derivation of gases, improving the efficiency of gas collection. The liquid inlet assembly controls the introduction of the fluid into the tank body. The detection assembly monitors the internal pressure change of the tank body in real time, facilitating the reading of the real-time vacuum pumping data by the vacuum pumping assembly. When the fluid is not introduced, the tank body and the gas collection assembly are connected through the vacuum pumping assembly, and the residual gases in the tank body and the gas collection assembly are vacuum-treated to avoid the influence of the remaining gases on the subsequent detection results of trace non-carbon dioxide greenhouse gases, ensuring the accuracy of the subsequent detection results and improving the accuracy of gas component analysis, with good use effects.

[0016] 2. In the present invention, when the fluid is introduced through the negative-pressure tank body, the negative pressure inside the tank body facilitates the introduction of the fluid through the liquid inlet assembly. After the fluid is introduced into the tank body, the vacuum pumping assembly is used to form a negative pressure inside the tank body again, but the gas inside the tank body will not be exported, so that the trace non-carbon dioxide greenhouse gas in the fluid inside the tank body can be quickly precipitated, and the trace non-carbon dioxide greenhouse gas forms an equilibrium at the conical end inside the tank body, reducing the pretreatment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic three-dimensional structure diagram of the present invention; Figure 2 is an overall exploded structure diagram of the present invention; Figure 3 is a schematic front view structure diagram of the present invention; Figure 4 In the present invention Figure 3 is a schematic A-A cross-sectional structure diagram; Figure 5 is a schematic side view structure diagram of the present invention; Figure 6 In the present invention Figure 5 is a schematic B-B cross-sectional structure diagram.

[0018] In the figure: 1. Main body assembly; 11. Tank body; 12. Bridge end; 13. Liquid inlet pipe; 14. Gas guide pipe; 15. Negative pressure pipe; 2. Liquid inlet assembly; 21. Liquid inlet needle body; 22. Sealing plug; 23. Liquid inlet three-way valve; 24. Filter; 25. Liquid inlet rubber hose; 3. Gas collection assembly; 31. Gas guide needle body; 32. Gas guide three-way valve; 33. Gas collection bag; 4. Detection assembly; 41. Pressure sensor; 42. Temperature sensor; 43. Liquid level sensor; 5. Vacuum pumping assembly; 51. Valve body; 52. Exhaust pipe; 53. Negative pressure middle pipe; 54. Piston; 55. Limit ring; 6. Oscillation assembly; 61. Bottom plate; 62. Connecting shaft; 63. Limit claw; 64. Limit block; 65. Eccentric wheel; 66. Connecting rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment: Please refer to Figures 1 - 6, in the embodiments of the present invention, a dissolved trace greenhouse gas collection and pretreatment device includes a main body assembly 1, a liquid inlet assembly 2, a gas collection assembly 3, a detection assembly 4, and a vacuum pumping assembly 5: The main body assembly 1 includes a tank body 11 that is hollow and has a conical upper end. The upper end of the tank body 11 is sequentially connected with a liquid inlet pipe 13, a gas guide pipe 14, and a negative pressure pipe 15. The tank body 11 is used to store the fluid and precipitate greenhouse gases; the liquid inlet assembly 2 is connected to the liquid inlet pipe 13, and the liquid inlet pipe 13 is used to introduce the fluid; the gas collection assembly 3 is connected to the gas guide pipe 14, and the gas collection assembly 3 is used to collect gases; the detection assembly 4 is installed at the upper end of the tank body 11; the detection assembly 4 is used for pressure detection; the vacuum pumping assembly 5 is connected to the negative pressure pipe 15, and the vacuum pumping assembly 5 is used to form a negative pressure environment inside the tank body 11 to reduce gas pollution and at the same time assist the fluid to precipitate greenhouse gases.

[0021] Specifically, in the present invention, the conical design of the tank body 11 is conducive to the aggregation and export of gases, improving the efficiency of gas collection. The liquid inlet assembly 2 controls the introduction of the fluid into the tank body 11. The detection assembly 4 monitors the internal pressure change of the tank body 11 in real time, facilitating the reading of the real-time vacuum pumping data by the vacuum pumping assembly 5. When the fluid is not introduced, the tank body 11 and the gas collection assembly 3 are connected through the vacuum pumping assembly 5, and the residual gases in the tank body 11 and the gas collection assembly 3 are vacuumed to avoid the influence of the remaining gases on the detection results of subsequent trace non-carbon dioxide greenhouse gases, ensuring the accuracy of subsequent detection results, improving the accuracy of gas component analysis, and having good use effects. After the gas collection assembly 3 is vacuumed, the gas collection assembly 3 is sealed and closed, facilitating subsequent gas collection. When the negative pressure tank body 11 introduces the fluid, the negative pressure inside the tank body 11 facilitates the introduction of the fluid through the liquid inlet assembly 2. After the fluid is introduced into the tank body 11, the vacuum pumping assembly 5 forms a negative pressure inside the tank body 11 again, but does not export the gas inside the tank body 11, enabling the trace non-carbon dioxide greenhouse gases in the fluid inside the tank body 11 to precipitate quickly, allowing the trace non-carbon dioxide greenhouse gases to form an equilibrium at the conical end inside the tank body 11, reducing the pretreatment time. After the precipitation is completed, the inside of the tank body 11 is made to be at normal pressure, facilitating the collection of gases through the gas collection assembly 3. It is applicable to the collection and pretreatment of dissolved trace non-carbon dioxide greenhouse gases in urban water systems such as urban surface water, urban drainage, and urban reclaimed water, and is not interfered by external environmental gases, with high sample fidelity.

[0022] Preferably, as Figure 2 and Figure 4As shown in the figure, the vacuum pumping assembly 5 includes a valve body 51, a negative pressure middle pipe 53 and an air extraction pipe 52. The valve body 51 is connected to the negative pressure pipe 15. One end of the negative pressure middle pipe 53 is connected to the upper end of the tank body 11. A limiting ring 55 is connected to the inner wall of the negative pressure middle pipe 53. A piston 54 is movably connected in the negative pressure middle pipe 53. The other end of the negative pressure middle pipe 53 is connected to a sealing valve. The air extraction pipe 52 is sequentially connected to the valve body 51 and the sealing valve. The air extraction pipe 52 is used to connect to an external vacuum pumping device. The air extraction pipe 52 and the valve body 51 are used to pump vacuum before the fluid is introduced into the tank body 11 to reduce gas pollution. The air extraction pipe 52 and the negative pressure middle pipe 53 are used to precipitate greenhouse gases after the fluid is introduced.

[0023] Further, the external vacuum pumping device includes a vacuum pump. The vacuum pump is connected to the sealing valve through the air extraction pipe 52. When the inside of the tank body 11 needs to be pumped vacuum, the vacuum pump is started to ensure a negative pressure environment is formed inside the tank body 11.

[0024] Specifically, when there is no fluid introduced inside the tank body 11 to form a negative pressure, the sealing valve on the negative pressure middle pipe 53 is closed. The tank body 11 is communicated with the gas collection assembly 3. The sealing valve on the negative pressure middle pipe 53 is closed. The vacuum pump is started. The vacuum pump evacuates the residual gas existing in the tank body 11 and the gas collection assembly 3 through the air extraction pipe 52 to avoid the influence of the remaining gas on the detection result of trace non-carbon dioxide greenhouse gases in the subsequent process, ensure the accuracy of the subsequent detection result, and improve the analysis accuracy of gas components. After the fluid is introduced into the tank body 11, by closing the valve body 51, opening the sealing valve on the negative pressure middle pipe 53, and starting the vacuum pump, the vacuum pump forms a negative pressure inside the tank body 11 again through the air extraction pipe 52. Since the piston 54 is connected inside the negative pressure middle pipe 53, the piston 54 moves after a negative pressure is formed inside the negative pressure middle pipe 53, thereby forming a negative pressure inside the tank body 11, reducing the solubility of trace non-carbon dioxide greenhouse gases in the fluid, but not discharging the gas inside the tank body 11. The total content of trace non-carbon dioxide greenhouse gases remains unchanged, enabling the trace non-carbon dioxide greenhouse gases in the fluid inside the tank body 11 to precipitate quickly, allowing the trace non-carbon dioxide greenhouse gases to form an equilibrium at the conical end inside the tank body 11, continuously maintaining the pressure through the sealing valve at one end of the negative pressure middle pipe 53, enabling the trace non-carbon dioxide greenhouse gases in the fluid to precipitate stably, reducing the pretreatment time. After the precipitation is completed, the sealing valve on the negative pressure middle pipe 53 is opened to allow external gas to be introduced, and the tank body 11 is restored to normal pressure, facilitating the collection of gas through the gas collection assembly 3. Among them, when the vacuum pump evacuates the residual gas existing in the tank body 11 and the gas collection assembly 3 through the air extraction pipe 52, the piston 54 abuts against the limiting ring 55 to ensure the overall sealing state of the tank body 11, form a negative pressure again, and ensure that the trace non-carbon dioxide greenhouse gases in the fluid can be fully precipitated.

[0025] Preferably, as Figure 2 shown, a plurality of annular sealing strips are sleeved on the piston 54, and the plurality of sealing strips are equidistantly arranged on the piston 54.

[0026] Specifically, the sealing strip can effectively prevent gas leakage in the negative pressure middle tube 53, improve the stability and durability of negative pressure formation. When the piston 54 moves in the negative pressure middle tube 53, the sealing strip fits closely with the inner wall of the negative pressure middle tube 53, forming a reliable sealing barrier, ensuring precise control of the negative pressure environment, and further improving the accuracy and reliability of gas component analysis. In addition, the sealing strips are equidistantly arranged on the piston 54, which can ensure the smoothness and uniformity of the piston 54 during movement, avoid negative pressure fluctuations caused by uneven sealing, and provide a more stable environment for subsequent gas collection and analysis.

[0027] Preferably, as Figure 2 and Figure 4 shown, the liquid inlet assembly 2 includes a liquid inlet needle body 21, a sealing plug 22 is penetrated and connected to the liquid inlet needle body 21, the liquid inlet needle body 21 is hermetically connected to the liquid inlet tube 13 through the sealing plug 22, the other end of the liquid inlet needle body 21 is connected to a liquid inlet three-way valve 23, one end of the liquid inlet three-way valve 23 is connected to a filter 24, the filter 24 is connected to a liquid inlet rubber tube 25, and the liquid inlet three-way valve 23 is used for exhausting the gas in the liquid inlet rubber tube 25 and controlling the fluid to be introduced into the liquid inlet needle body 21.

[0028] Specifically, when introducing fluid into the liquid inlet rubber tube 25, open the liquid inlet three-way valve 23, inject the fluid into the liquid inlet rubber tube 25 through an injection device, and exhaust the residual gas in the liquid inlet rubber tube 25 to reduce gas interference. When fluid needs to be introduced, place the liquid inlet rubber tube 25 filled with fluid into the container storing the fluid, utilize the negative pressure inside the tank body 11, open the fluid channel of the liquid inlet three-way valve 23, and let the fluid enter the tank body 11 through the filter 24, the liquid inlet three-way valve 23 and the liquid inlet needle body 21 in sequence, which is convenient to operate.

[0029] Furthermore, the sealing plug 22 is a solid "T"-shaped silica gel plug, which can not only fit closely with the liquid inlet needle body 21 to prevent fluid leakage, but also maintain good elasticity for easy installation and disassembly. The "T"-shaped structure of the sealing plug 22 increases the contact area with the inner wall of the liquid inlet tube 13, further improving the sealing effect. In addition, the selection of silica gel material ensures the corrosion resistance and high temperature resistance of the sealing plug 22, is suitable for various fluid environments, and extends the service life of the equipment.

[0030] Preferably, as Figure 2 shown, the gas collection assembly 3 includes a gas guiding needle body 31 and a gas collection bag 33, a sealing plug 22 is penetrated and connected to the gas guiding needle body 31, the gas guiding needle body 31 is hermetically connected to the liquid inlet tube 13 through the sealing plug 22, one end of the gas guiding needle body 31 is connected to a gas guiding three-way valve 32, the gas guiding three-way valve 32 is connected to the gas collection bag 33, and the gas collection bag 33 is used for collecting gas.

[0031] Specifically, during the vacuum pumping process, the gas inside the tank body 11 is smoothly led out through the air guiding needle body 31. The air guiding three-way valve 32, as the control hub for the gas flow direction, can flexibly open or close the gas channel, facilitating the introduction of gas into the gas collection bag 33. The gas collection bag 33 adopts a double-valve aluminum foil sampling gas bag with a volume of 50 mL. The gas sample in the headspace is collected by controlling the left valve, and the right valve is used to collect the gas and send it to a gas chromatograph for detection, providing convenience for subsequent gas analysis or treatment.

[0032] Furthermore, when collecting trace non-carbon dioxide greenhouse gases, close the sealing valve and the valve body 51. Take a 20 mL graduated glass syringe, rinse the syringe 3 - 4 times with high-purity nitrogen (content > 99.999%), quantitatively take 20 mL of high-purity nitrogen, and through rotating the air guiding three-way valve 32 in the gas collection system, make the air guiding three-way valve 32 communicate with the conical headspace inside the tank body 11. Inject the 20 mL of high-purity nitrogen taken into the headspace, repeatedly pull and push the syringe multiple times to make the headspace gas mix evenly. After the headspace gas is mixed evenly, push all the gas in the glass syringe out, rotate the air guiding three-way valve 32 to make the aluminum foil gas bag communicate with the headspace, unscrew the left sealing component of the aluminum foil gas bag 8. Since the headspace of the tank body 11 is in a positive pressure state, the gas components to be measured automatically enter the aluminum foil gas sampling bag. Subsequently, tighten the left sealing component of the aluminum foil gas bag, and the collection of the gas components to be measured is completed.

[0033] Then, the collected gas is measured by a gas chromatograph equipped with a dielectric barrier discharge plasma detector (BID).

[0034] Calculate the concentration of the dissolved non-carbon dioxide greenhouse gas in the sample to be measured according to Henry's law. The calculation formula is as follows: C w, eq = H • R • T • C g, eq C s = [(V r - V s ) C g, eq + V s • C w, eq / V s In the formula, C w, eq is the concentration in the liquid phase under equilibrium conditions (mol / L); C g, eq is the concentration in the gas phase under equilibrium conditions (mol / L); C s is the dissolved concentration in the water sample (mol / L); V s is the volume of the sample liquid (L); V rV is the reactor volume (L); H is the Henry's law constant (mol / L • atm); R is the ideal gas constant (0.0821 L • atm / mol • K); T is the temperature (K).

[0035] Preferably, as Figure 2 and Figure 4 shown, the detection component 4 includes a pressure sensor 41, the pressure sensor 41 is connected to the upper end of the tank body 11, the pressure sensor 41 is used for detecting the internal pressure of the tank body 11, the detection component 4 further includes a temperature sensor 42 and a liquid level sensor 43, the temperature sensor 42 and the liquid level sensor 43 are both connected to the upper end of the tank body 11, the temperature sensor 42 is used for detecting the internal temperature of the tank body 11, and the liquid level sensor 43 is used for detecting the internal fluid level of the tank body 11 to obtain the internal fluid volume of the tank body 11.

[0036] Specifically, through the pressure sensor 41, the internal pressure change of the tank body 11 can be monitored in real time to ensure a stable pressure environment during gas collection and measurement, which is crucial for accurately measuring the concentration of dissolved non - greenhouse gases. The temperature sensor 42 can accurately measure the internal temperature of the tank body 11, providing key parameters for the calculation of Henry's law and ensuring the accuracy of the calculation results. The introduction of the liquid level sensor 43 enables the system to grasp the liquid level situation of the internal fluid of the tank body 11 in real time, thereby indirectly calculating the fluid volume and providing strong support for subsequent sample processing and data analysis.

[0037] Preferably, as Figures 2 - 6 shown, it further includes an oscillation component 6, the oscillation component 6 includes a bottom plate 61, the bottom end of the tank body 11 is connected with a bridge end 12, the upper end surface of the bottom plate 61 is connected with a connecting shaft 62, the connecting shaft 62 passes through and is movably connected to the middle of the bridge end 12, the bottom of the bridge end 12 is movably connected with a connecting rod 66, the other end of the connecting rod 66 is movably connected with an eccentric wheel 65, the eccentric wheel 65 is movably connected to the upper end surface of the bottom plate 61, the eccentric wheel 65 is connected to an external power device, and a limiting component is installed on the bottom plate 61. The oscillation component 6 is used for the oscillation swing of the tank body 11, and the limiting component is used for resisting and limiting the tank body 11.

[0038] Specifically, when the external power device is started, the eccentric wheel 65 rotates accordingly. Since both ends of the connecting rod 66 are movably connected to the bridge end 12 and the eccentric wheel 65 respectively, as the eccentric wheel 65 rotates, the connecting rod 66 drives the bridge end 12 and the connected tank body 11 to perform reciprocating oscillating swings. This kind of swing helps the fluid inside the tank body 11 to come into contact with the tank wall more fully, promoting the mixing and dissolution process of the fluid. Especially when performing operations such as gas dissolution or sample pretreatment, it can significantly improve the efficiency and effect. At the same time, the limiting components installed on the bottom plate 61 can ensure that the tank body 11 will not exceed the predetermined range during the swinging process, which not only guarantees the safety of the operation but also avoids the risk of damage to the equipment due to excessive swinging. The design of the entire oscillating assembly 6 is ingenious and practical. The device as a whole adopts an integrated design, with a simple, compact structure, low cost, and is easy to be made into a modular equipment, suitable for in-situ or off-site detection of fluids.

[0039] Preferably, as Figure 6 shown, the limiting components include limiting claws 63 and a limiting block 64. A plurality of limiting claws 63 are fixedly connected to the bottom plate 61. Multiple groups of clamping grooves are formed inside the limiting block 64. The limiting claws 63 are clamped and installed in the clamping grooves inside the limiting block 64. The limiting claws 63 are used for vertically moving and limiting the clamping connection of the limiting block 64. The limiting block 64 is used for the contact limiting and oscillating swing limiting of the tank body 11. The two sides at the bottom end of the bridge end 12 are arc-shaped surfaces, and the contact limiting end of the limiting block 64 matches the bottom end of the bridge end 12.

[0040] Specifically, the limiting block 64 is adjusted in the vertical height through the limiting claws 63, so that the limiting block 64 contacts and limits or separates from the bridge end 12. When the limiting block 64 and the bridge end 12 are in a separated state, the arc-shaped end of the limiting block 64 limits the swing of the bridge end 12 on both sides, thereby limiting the tank body 11, further ensuring the stability and safety of the swing of the tank body 11, and enhancing the stability and reliability of the entire device.

[0041] A method for collecting and preprocessing dissolved trace greenhouse gases includes the following steps: When the tank body 11 in the main body assembly 1 is not filled with fluid, connect the gas collection assembly 3 to the tank body 11; Form a negative pressure environment inside the tank body 11 through the vacuum pumping assembly 5. Observe through the detection assembly 4 that the negative pressure value inside the tank body 11 reaches the preset value, and then close the gas collection assembly 3 to reduce the gas pollution of the tank body 11 and the gas collection assembly 3; Introduce the fluid to be preprocessed into the tank body 11 through the liquid inlet assembly 2, and then form a negative pressure environment inside the tank body 11 through the vacuum pumping assembly 5 to assist the fluid in precipitating greenhouse gases; Collect the precipitated greenhouse gases through the gas collection assembly 3.

[0042] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A device for collecting and preprocessing dissolved trace greenhouse gases, characterized in that Comprising: A main body component (1), the main body component (1) includes a hollow tank body (11) with a conical upper end. An inlet pipe (13), a gas guide pipe (14), and a negative pressure pipe (15) are sequentially connected to the upper end of the tank body (11). The tank body (11) is used for storing fluid and precipitating greenhouse gases. A liquid inlet component (2), the liquid inlet component (2) is connected to the inlet pipe (13), and the inlet pipe (13) is used for introducing fluid. A gas collection component (3), the gas collection component (3) is connected to the gas guide pipe (14), and the gas collection component (3) is used for collecting gas. A detection component (4), the detection component (4) is installed at the upper end of the tank body (11); the detection component (4) is used for pressure detection. A vacuum pumping component (5), the vacuum pumping component (5) is connected to the negative pressure pipe (15), and the vacuum pumping component (5) is used to form a negative pressure environment inside the tank body (11) to reduce gas pollution and at the same time assist the fluid in precipitating greenhouse gases.

2. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: The vacuum pumping component (5) includes a valve body (51), a negative pressure middle pipe (53), and a suction pipe (52). The valve body (51) is connected to the negative pressure pipe (15). One end of the negative pressure middle pipe (53) is connected to the upper end of the tank body (11). A limiting ring (55) is connected to the inner wall of the negative pressure middle pipe (53). A piston (54) is movably connected inside the negative pressure middle pipe (53). The other end of the negative pressure middle pipe (53) is connected to a sealing valve. The suction pipe (52) is sequentially connected to the valve body (51) and the sealing valve. The suction pipe (52) is used to connect to an external vacuum pumping device. The suction pipe (52) and the valve body (51) are used to pump vacuum before introducing fluid into the tank body (11) to reduce gas pollution. The suction pipe (52) and the negative pressure middle pipe (53) are used to precipitate greenhouse gases after introducing fluid.

3. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 2, characterized in that: A plurality of annular sealing strips are sleeved on the piston (54), and the plurality of sealing strips are equidistantly arranged on the piston (54).

4. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 2, characterized in that: The liquid inlet component (2) includes a liquid inlet needle body (21). A sealing plug (22) is penetrated and connected to the liquid inlet needle body (21). The liquid inlet needle body (21) is hermetically connected to the inside of the inlet pipe (13) through the sealing plug (22). The other end of the liquid inlet needle body (21) is connected to a liquid inlet three-way valve (23). One end of the liquid inlet three-way valve (23) is connected to a filter (24). The filter (24) is connected to a liquid inlet rubber hose (25). The liquid inlet three-way valve (23) is used for discharging gas in the liquid inlet rubber hose (25) and controlling the introduction of fluid into the liquid inlet needle body (21).

5. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 4, characterized in that: The gas collection component (3) includes a gas guide needle body (31) and a gas collection bag (33). A sealing plug (22) is penetrated and connected to the gas guide needle body (31). The gas guide needle body (31) is hermetically connected to the inside of the inlet pipe (13) through the sealing plug (22). One end of the gas guide needle body (31) is connected to a gas guide three-way valve (32). The gas guide three-way valve (32) is connected to the gas collection bag (33). The gas collection bag (33) is used for collecting gas.

6. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: The detection component (4) includes a pressure sensor (41), and the pressure sensor (41) is connected to the upper end of the tank body (11), and the pressure sensor (41) is used for detecting the internal pressure of the tank body (11).

7. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 6, characterized in that: The detection component (4) further includes a temperature sensor (42) and a liquid level sensor (43). Both the temperature sensor (42) and the liquid level sensor (43) are connected to the upper end of the tank body (11). The temperature sensor (42) is used for detecting the internal temperature of the tank body (11), and the liquid level sensor (43) is used for detecting the internal fluid level of the tank body (11) to obtain the internal fluid volume of the tank body (11).

8. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: It further includes an oscillation component (6). The oscillation component (6) includes a bottom plate (61). A bridge end (12) is connected to the bottom end of the tank body (11). A connecting shaft (62) is connected to the upper end surface of the bottom plate (61). The connecting shaft (62) penetrates and is movably connected to the middle of the bridge end (12). A connecting rod (66) is movably connected to the bottom of the bridge end (12). The other end of the connecting rod (66) is movably connected to an eccentric wheel (65). The eccentric wheel (65) is movably connected to the upper end surface of the bottom plate (61). The eccentric wheel (65) is connected to an external power device. A limiting component is installed on the bottom plate (61). The oscillation component (6) is used for the oscillating swing of the tank body (11), and the limiting component is used for resisting and limiting the tank body (11).

9. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 8, characterized in that: The limiting component includes a limiting claw (63) and a limiting block (64). A plurality of limiting claws (63) are fixedly connected to the bottom plate (61). A plurality of groups of clamping grooves are formed inside the limiting block (64). The limiting claws (63) are clamped and installed in the clamping grooves inside the limiting block (64). The limiting claws (63) are used for vertically moving and limiting the clamping of the limiting block (64). The limiting block (64) is used for resisting and limiting the tank body (11) and limiting the oscillating swing. The two sides of the bottom end of the bridge end (12) are arc-shaped surfaces, and the resisting and limiting end of the limiting block (64) matches the bottom end of the bridge end (12).

10. A method for collecting and preprocessing dissolved trace greenhouse gases, applied to the device according to any one of claims 1-9 above, characterized in that It includes the following steps: When the tank body (11) in the main body component (1) is not filled with fluid, connect the gas collection component (3) to the tank body (11); Form a negative pressure environment inside the tank body (11) through the vacuum pumping component (5). Observe that the internal negative pressure value of the tank body (11) reaches the preset value through the detection component (4), and then close the gas collection component (3) to reduce the gas pollution of the tank body (11) and the gas collection component (3); Import the fluid to be pre-treated into the tank body (11) through the liquid inlet component (2), and then form a negative pressure environment inside the tank body (11) through the vacuum pumping component (5) to assist the fluid in precipitating greenhouse gases; Collect the precipitated greenhouse gases through the gas collection component (3).

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