A device and method for collecting and preprocessing dissolved trace greenhouse gases

Abstract

The present invention discloses a device and method for collecting and preprocessing soluble trace greenhouse gases in the field of carbon emission monitoring and accounting technology, comprising a main body component, wherein the main body component comprises a hollow tank body with a tapered upper end, and the upper end of the tank body is sequentially connected with a liquid inlet pipe, an air guide pipe and a negative pressure pipe. The present invention is conducive to the aggregation and extraction of gas through the tapered design of the tank body, thereby improving the efficiency of gas collection. The liquid inlet component controls the introduction of fluid into the tank body, and the detection component monitors the pressure change inside the tank body in real time, which facilitates the reading of real-time vacuum data by the vacuum component. When no fluid is introduced, the tank body and the gas collection component are connected through the vacuum component, and the residual gas in the tank body and the gas collection component is vacuumed to avoid the residual gas from affecting the subsequent trace non-carbon dioxide greenhouse gas detection results, thereby ensuring the accuracy of the subsequent detection results, improving the accuracy of gas component analysis, and having a good use effect.

Description

Technical Field

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

[0002] Non-CO2 greenhouse gases (NGHGs), such as methane (CH4) and nitrous oxide (N2O), are significant atmospheric greenhouse gases, with per-molecule warming potentials 27.9 and 298 times greater than that of carbon dioxide (CO2), respectively. Water contains abundant carbon and nitrogen, which can produce CH4 and N2O through the carbon and nitrogen cycles, making them important pathways for direct carbon emissions. Therefore, accurate monitoring of dissolved NGHGs in water is a critical component of carbon emissions accounting.

[0003] The headspace equilibrium method is the mainstream pretreatment method currently used for analysis and detection of dissolved gases in water bodies. This method oscillates the liquid sample to be tested in a closed container so that the liquid phase and the components to be tested in the headspace of the container reach a state of equilibrium, and then measures the concentration of the headspace components and infers the concentration of each component in the sample to be tested based on Henry's law. However, the existing water sample pretreatment equipment for dissolved trace gases is lacking, the pretreatment operation method is not standardized, and the sample is easily contaminated by environmental gases, resulting in large errors and low precision in the subsequent gas component analysis, which cannot meet the requirements of accurate quantitative analysis of dissolved trace non-dihydrogenous greenhouse gases in water bodies. In addition, the ordinary dissolved gas analysis and detection equipment in water bodies takes a long time to precipitate trace non-dihydrogenous greenhouse gases, and the precipitation in the fluid is not thorough enough, which affects the final detection results and the use effect is poor. 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 mentioned above that the samples are easily contaminated by environmental gases, and the dissolved gas analysis and detection device in ordinary water bodies takes a long time to precipitate trace non-greenhouse gases, and the precipitation in the fluid is not thorough enough, resulting in large errors and low accuracy in subsequent gas component analysis.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a device for collecting and preprocessing dissolved trace greenhouse gases, comprising:

[0007] A main body assembly, comprising a hollow tank body with a tapered upper end, the upper end of which is sequentially connected to a liquid inlet pipe, an air guide pipe, and a negative pressure pipe, the tank body being used to store fluid and release greenhouse gases;

[0008] A liquid inlet assembly, the liquid inlet assembly being connected to a liquid inlet pipe, the liquid inlet pipe being used to introduce fluid;

[0009] A gas collecting assembly connected to the air duct and used to collect gas;

[0010] A detection component is installed at the upper end of the tank body; the detection component is used for pressure detection;

[0011] A vacuum pumping component is connected to a negative pressure pipe and is used to form a negative pressure environment inside the tank to reduce gas pollution and assist the fluid in releasing greenhouse gases.

[0012] As a further solution of the present invention: the vacuum assembly includes a valve body, a negative pressure middle tube and an exhaust pipe, the valve body is connected to the negative pressure tube, one end of the negative pressure middle tube is connected to the upper end of the tank body, the inner wall of the negative pressure middle tube is connected to a limiting ring, a piston is movably connected inside the negative pressure middle tube, the other end of the negative pressure middle tube is connected to a sealing valve, the exhaust pipe is connected to the valve body and the sealing valve in sequence, the exhaust pipe is used to connect an external vacuum equipment, the exhaust pipe and the valve body are used to vacuum the tank before introducing fluid to reduce gas pollution, and the exhaust pipe and the negative pressure middle tube are used to precipitate greenhouse gases after introducing fluid.

[0013] 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.

[0014] As a further solution of the present invention: the liquid inlet assembly includes a liquid inlet needle body, a sealing plug is passed through the liquid inlet needle body, the liquid inlet needle body is sealed and connected to the liquid inlet pipe through the sealing plug, the other end of the liquid inlet needle body is connected to the liquid inlet three-way valve, one end of the liquid inlet three-way valve is connected to the filter, the filter is connected to the liquid inlet hose, and the liquid inlet three-way valve is used to discharge the gas in the liquid inlet hose and control the introduction of fluid into the liquid inlet needle body.

[0015] As a further solution of the present invention: the gas collection assembly includes a gas guide needle body and a gas collection bag, the gas guide needle body is connected through a sealing plug, the gas guide needle body is sealed in the liquid inlet pipe through the sealing plug, one end of the gas guide needle body is connected to a gas guide three-way valve, the gas guide three-way valve is connected to a gas collection bag, and the gas collection bag is used to collect gas.

[0016] 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.

[0017] As a further solution of the present invention: the detection component also includes a temperature sensor and a liquid level sensor, both of which are connected to the upper end of the tank body. The temperature sensor is used to detect the temperature inside the tank body, and the liquid level sensor is used to detect the liquid level of the fluid inside the tank body to obtain the fluid capacity inside the tank body.

[0018] As a further solution of the present invention: it also includes an oscillation component, the oscillation component includes a base plate, the bottom end of the tank body is connected to the bridge end, the upper end surface of the base plate is connected to a connecting shaft, the connecting shaft passes through and is movably connected to the middle part of the bridge end, the bottom of the bridge end is movably connected to a connecting rod, the other end of the connecting rod is movably connected to an eccentric wheel, the eccentric wheel is movably connected to the upper end surface of the base plate, the eccentric wheel is connected to an external power device, a limiting component is installed on the base plate, the oscillation component is used for the oscillation and swinging of the tank body, and the limiting component is used to resist and limit the tank body.

[0019] As a further solution of the present invention: the limiting component includes a limiting claw and a limiting block, a plurality of limiting claws are fixedly connected to the bottom plate, a plurality of groups of positioning grooves are provided inside the limiting block, the limiting claws are clamped and installed in the positioning grooves inside the limiting block, the limiting claws are used for the vertical movement limiting clamping of the limiting block, the limiting block is used for the interference limiting and oscillation swing limiting of the tank body, the two sides of the bottom end of the bridge end are arc-shaped surfaces, and the interference limiting end of the limiting block matches the bottom end of the bridge end.

[0020] In a second aspect, the present invention provides a method for collecting and preprocessing dissolved trace greenhouse gases, comprising the following steps:

[0021] When the tank body in the main assembly is not filled with fluid, the gas collecting assembly is connected to the tank body;

[0022] A negative pressure environment is formed inside the tank through the vacuum component, and when the negative pressure value inside the tank reaches the preset value through the detection component, the gas collection component is closed to reduce gas contamination of the tank and the gas collection component;

[0023] The fluid to be pre-treated is introduced into the tank through the liquid inlet assembly, and then a negative pressure environment is formed inside the tank through the vacuum assembly to assist the fluid in releasing greenhouse gases;

[0024] The released greenhouse gases are collected by the gas collection assembly.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the present invention, the conical design of the tank body is conducive to the gathering and discharge of gas, thereby improving the efficiency of gas collection. The liquid inlet component controls the introduction of fluid into the tank body, and the detection component monitors the pressure changes inside the tank body in real time, which is convenient for the vacuum component to read the real-time vacuum data. When no fluid is introduced, the tank body and the gas collection component are connected through the vacuum component, and the residual gas in the tank body and the gas collection component is vacuumed to avoid the residual gas from affecting the subsequent trace non-CO2 greenhouse gas detection results, thereby ensuring the accuracy of the subsequent detection results, improving the accuracy of gas component analysis, and having a good use effect.

[0027] 2. In the present invention, when the fluid is introduced into the negative pressure tank, the negative pressure inside the tank facilitates the introduction of the fluid through the liquid inlet component. After the fluid is introduced into the tank, the vacuum component is used to form a negative pressure inside the tank again, but the gas inside the tank will not be discharged, so that the trace non-CO2 greenhouse gas in the fluid inside the tank can be quickly precipitated, and the trace non-CO2 greenhouse gas can be balanced at the tapered end inside the tank, thereby reducing the pretreatment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the overall explosion structure of the present invention;

[0030] Figure 3 It is a front view structural schematic diagram of the present invention;

[0031] Figure 4 For the present invention Figure 3 AA cross-sectional structural diagram;

[0032] Figure 5 It is a side structural schematic diagram of the present invention;

[0033] Figure 6 The present invention Figure 5 Schematic diagram of the BB cross-sectional structure.

[0034] In the figure: 1. Main assembly; 11. Tank body; 12. Bridge end; 13. Liquid inlet pipe; 14. Air 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 hose; 3. Gas collection assembly; 31. Air guide needle body; 32. Air guide three-way valve; 33. Gas collecting bag; 4. Detection assembly; 41. Pressure sensor; 42. Temperature sensor; 43. Liquid level sensor; 5. Vacuum assembly; 51. Valve body; 52. Air extraction pipe; 53. Negative pressure middle pipe; 54. Piston; 55. Limiting ring; 6. Oscillation assembly; 61. Bottom plate; 62. Connecting shaft; 63. Limiting claw; 64. Limiting block; 65. Eccentric wheel; 66. Connecting rod. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example:

[0037] See also Figures 1-6 In an embodiment of the present invention, a dissolved trace greenhouse gas collection and pretreatment device includes a main component 1, a liquid inlet component 2, a gas collection component 3, a detection component 4 and a vacuum component 5: the main component 1 includes a hollow tank body 11 with a conical upper end, and the upper end of the tank body 11 is connected with a liquid inlet pipe 13, an air guide pipe 14 and a negative pressure pipe 15 in sequence, and the tank body 11 is used to store fluid and precipitate greenhouse gases; the liquid inlet component 2 is connected to the liquid inlet pipe 13, and the liquid inlet pipe 13 is used to introduce fluid; the gas collection component 3 is connected to the air guide pipe 14, and the gas collection component 3 is used to collect gas; the detection component 4 is installed at the upper end of the tank body 11; the detection component 4 is used for pressure detection; the vacuum component 5 is connected to the negative pressure pipe 15, and the vacuum component 5 is used to form a negative pressure environment inside the tank body 11 to reduce gas pollution and assist the fluid in precipitating greenhouse gases.

[0038] Specifically, the conical design of the tank body 11 in the present invention is conducive to the gathering and discharge of gas, thereby improving the efficiency of gas collection. The liquid inlet component 2 controls the introduction of fluid into the tank body 11, and the detection component 4 monitors the pressure change inside the tank body 11 in real time, which is convenient for the vacuum component 5 to read the real-time true data. When no fluid is introduced, the tank body 11 and the gas collection component 3 are connected through the vacuum component 5, and the residual gas in the tank body 11 and the gas collection component 3 is vacuumed to avoid the residual gas from affecting the subsequent trace non-carbon dioxide greenhouse gas detection results, thereby ensuring the accuracy of the subsequent detection results, improving the accuracy of gas component analysis, and having a good use effect. After the gas collection component 3 is vacuumed, the gas collection component 3 is sealed and closed, which is convenient for 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 component 2. After the fluid is introduced into the tank body 11, the vacuum component 5 forms a negative pressure inside the tank body 11 again, but the gas inside the tank body 11 will not be discharged, so that the trace non-carbon dioxide greenhouse gases in the fluid inside the tank body 11 can be quickly precipitated, and the trace non-carbon dioxide greenhouse gases can form a balance at the tapered end inside the tank body 11, reducing the pretreatment time. After the precipitation is completed, the tank body 11 is formed into a normal pressure, which is convenient for the gas to be collected through the gas collection component 3. It is suitable for the collection and pretreatment of soluble trace non-carbon dioxide greenhouse gases in urban water systems such as urban surface water, urban drainage, and urban recycled water, and is not interfered by external environmental gases, and the sample fidelity is high.

[0039] Preferably, Figure 2 and Figure 4 As shown, the vacuum assembly 5 includes a valve body 51, a negative pressure middle tube 53 and an exhaust pipe 52. The valve body 51 is connected to the negative pressure tube 15. One end of the negative pressure middle tube 53 is connected to the upper end of the tank body 11. The inner wall of the negative pressure middle tube 53 is connected to a limiting ring 55. A piston 54 is movably connected inside the negative pressure middle tube 53. The other end of the negative pressure middle tube 53 is connected to a sealing valve. The exhaust pipe 52 is connected to the valve body 51 and the sealing valve in sequence. The exhaust pipe 52 is used to connect an external vacuum equipment. The exhaust pipe 52 and the valve body 51 are used to vacuum the tank body 11 before introducing fluid to reduce gas pollution. The exhaust pipe 52 and the negative pressure middle tube 53 are used to precipitate greenhouse gases after introducing fluid.

[0040] Furthermore, the external vacuuming equipment includes a vacuum pump, which is connected to the sealing valve through an exhaust pipe 52. When vacuuming is required in the tank body 11, the vacuum pump is started to ensure that a negative pressure environment is formed in the tank body 11.

[0041] Specifically, when no fluid is introduced into the tank body 11 to form a negative pressure, the sealing valve on the negative pressure middle tube 53 is closed, the tank body 11 and the gas collection component 3 are connected, the sealing valve on the negative pressure middle tube 53 is closed, and the vacuum pump is started. The vacuum pump vacuums the residual gas in the tank body 11 and the gas collection component 3 through the exhaust pipe 52 to avoid the residual gas from affecting the subsequent trace non-carbon dioxide greenhouse gas detection results, ensuring the accuracy of the subsequent detection results, and improving the accuracy of gas component analysis. After the fluid is introduced into the tank body 11, the valve body 51 is closed, the sealing valve on the negative pressure middle tube 53 is opened, and the vacuum pump is started. The vacuum pump forms a negative pressure inside the tank body 11 again through the exhaust pipe 52. Since a piston 54 is connected to the negative pressure middle tube 53, the piston 54 moves after negative pressure is formed in the negative pressure middle tube 53, thereby forming a negative pressure inside the tank body 11, reducing the trace non-carbon dioxide greenhouse gases in the fluid. solubility, but will not lead out the gas inside the tank body 11, the total content of trace non-CO2 greenhouse gases remains unchanged, allowing the trace non-CO2 greenhouse gases in the fluid inside the tank body 11 to precipitate quickly, allowing the trace non-CO2 greenhouse gases to form a balance at the tapered end inside the tank body 11, and continuously maintaining pressure through the sealing valve at one end of the negative pressure middle tube 53, allowing the trace non-CO2 greenhouse gases in the fluid to precipitate stably, reducing the pretreatment time, after the precipitation is completed, open the sealing valve on the negative pressure middle tube 53 to allow external gas to be introduced, allowing the tank body 11 to return to normal pressure, so that the gas can be collected through the gas collection component 3, wherein, when the vacuum pump removes the residual gas in the tank body 11 and the gas collection component 3 through the exhaust pipe 52, the piston 54 contacts the limit ring 55 to ensure the overall sealing state of the tank body 11, and form negative pressure again to ensure that the trace non-CO2 greenhouse gases in the fluid can be fully precipitated.

[0042] Preferably, Figure 2 As 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 .

[0043] Specifically, the sealing strip can effectively prevent gas leakage in the negative pressure middle tube 53, improving the stability and durability of the negative pressure formation. When the piston 54 moves in the negative pressure middle tube 53, the sealing strip fits tightly against the inner wall of the negative pressure middle tube 53, forming a reliable sealing barrier. This ensures precise control of the negative pressure environment, thereby further improving the accuracy and reliability of gas component analysis. In addition, the sealing strips are equidistantly arranged on the piston 54 to ensure the stability and uniformity of the piston 54 during movement, avoiding negative pressure fluctuations caused by uneven sealing, and providing a more stable environment for subsequent gas collection and analysis.

[0044] Preferably, Figure 2 and Figure 4As shown, the liquid inlet assembly 2 includes a liquid inlet needle body 21, a sealing plug 22 is passed through the liquid inlet needle body 21, and the liquid inlet needle body 21 is sealed and connected to the liquid inlet pipe 13 through the sealing plug 22. The other end of the liquid inlet needle body 21 is connected to the liquid inlet three-way valve 23, one end of the liquid inlet three-way valve 23 is connected to the filter 24, the filter 24 is connected to the liquid inlet hose 25, and the liquid inlet three-way valve 23 is used to discharge the gas in the liquid inlet hose 25 and control the introduction of fluid into the liquid inlet needle body 21.

[0045] Specifically, when the liquid inlet hose 25 introduces the fluid, the liquid inlet three-way valve 23 is opened, and the fluid is injected into the liquid inlet hose 25 through the injection device to discharge the residual gas in the liquid inlet hose 25 to reduce gas interference. When the fluid needs to be introduced, the liquid inlet hose 25 filled with the fluid is placed in a container for storing the fluid, and the negative pressure inside the tank body 11 is used to open the fluid channel of the liquid inlet three-way valve 23, allowing the fluid to pass through the filter 24, the liquid inlet three-way valve 23 and the liquid inlet needle 21 in sequence into the tank body 11, which is convenient to operate.

[0046] Furthermore, the sealing plug 22 is a solid "T"-shaped silicone plug. It fits snugly against the inlet needle 21 to prevent fluid leakage, while also maintaining good elasticity for easy installation and removal. The "T" shape of the sealing plug 22 increases the contact area with the inner wall of the inlet tube 13, further enhancing the sealing effect. Furthermore, the choice of silicone material ensures the corrosion and high temperature resistance of the sealing plug 22, making it suitable for a variety of fluid environments and extending the service life of the device.

[0047] Preferably, Figure 2 As shown, the gas collection assembly 3 includes a gas guide needle body 31 and a gas collecting bag 33. The gas guide needle body 31 is connected through a sealing plug 22. The gas guide needle body 31 is sealed in the liquid 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 a gas collecting bag 33. The gas collecting bag 33 is used to collect gas.

[0048] Specifically, during the vacuuming process, the gas inside tank 11 is smoothly drained through gas guide needle 31. The three-way gas guide valve 32, acting as a control hub for gas flow, can flexibly open or close the gas channel, facilitating the introduction of gas into gas collection bag 33. Gas collection bag 33 utilizes a dual-valve aluminum foil sampling bag with a volume of 50 mL. The left valve is controlled to collect headspace gas samples, while the right valve is used to collect gas for testing by a gas chromatograph, facilitating subsequent gas analysis or processing.

[0049] Furthermore, when collecting trace amounts of non-carbon dioxide greenhouse gases, close the sealing valve and the valve body 51, take a 20 mL graduated glass syringe, rinse the syringe with high-purity nitrogen (content>99.999%) 3-4 times, then quantitatively take 20 mL of high-purity nitrogen and rotate the gas guide three-way valve 32 in the gas collection system to connect the gas guide three-way valve 32 with the conical headspace inside the tank body 11, inject the taken 20 mL of high-purity nitrogen into the headspace, repeatedly pull and draw the syringe multiple times to mix the headspace gas evenly, and after the headspace gas is evenly mixed, push out all the gas in the glass syringe, rotate the gas guide three-way valve 32 to connect the aluminum foil air bag with the headspace, unscrew the sealing component on the left side of the aluminum foil air bag 8, and since the headspace of the tank body 11 is in a positive pressure state, the gas of the component to be measured automatically enters the aluminum foil gas sampling bag, then tighten the sealing component on the left side of the aluminum foil air bag, and the gas of the component to be measured is collected.

[0050] The collected gas was then measured by a gas chromatograph equipped with a dielectric barrier discharge plasma detector (BID).

[0051] The concentration of dissolved non-GHGs in the sample to be tested is calculated according to Henry's law. The calculation formula is as follows:

[0052] C w, eq = H • R • T • C g, eq

[0053] C s = [(V r - V s ) C g, eq + V s • C w, eq ] / V s

[0054] Where 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 solubility concentration in the water sample (mol / L); V s is the volume of the sample liquid (L); V r is the reactor volume (L); H is Henry's law constant (mol / L • atm); R is the ideal gas constant (0.0821 L • atm / mol • K); and T is the temperature (K).

[0055] Preferably, Figure 2 and Figure 4As shown, the detection component 4 includes a pressure sensor 41, which is connected to the upper end of the tank body 11 and is used to detect the internal pressure of the tank body 11. The detection component 4 also includes a temperature sensor 42 and a liquid level sensor 43, which are both connected to the upper end of the tank body 11. The temperature sensor 42 is used to detect the internal temperature of the tank body 11, and the liquid level sensor 43 is used to detect the liquid level of the fluid inside the tank body 11 to obtain the internal fluid capacity of the tank body 11.

[0056] Specifically, pressure sensor 41 can monitor pressure changes inside tank 11 in real time, ensuring a stable pressure environment during gas collection and measurement. This is crucial for accurately measuring the concentration of dissolved non-GHGs. Temperature sensor 42 can precisely measure the temperature inside tank 11, providing a key parameter for Henry's law calculations and ensuring the accuracy of the results. The introduction of liquid level sensor 43 enables the system to monitor the liquid level inside tank 11 in real time, thereby indirectly calculating the fluid volume and providing strong support for subsequent sample processing and data analysis.

[0057] Preferably, Figure 2-Figure 6 As shown, it also includes an oscillation component 6, which includes a base plate 61. The bottom end of the tank body 11 is connected to the bridge end 12, and the upper end surface of the base plate 61 is connected to a connecting shaft 62. The connecting shaft 62 passes through and is movably connected to the middle part of the bridge end 12. The bottom of the bridge end 12 is movably connected to a connecting rod 66, and 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 base plate 61, and the eccentric wheel 65 is connected to an external power device. A limiting component is installed on the base plate 61. The oscillation component 6 is used for the oscillation and swinging of the tank body 11, and the limiting component is used to resist and limit the tank body 11.

[0058] Specifically, when the external power equipment is started, the eccentric wheel 65 rotates accordingly. Since the two 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 will drive the bridge end 12 and the connected tank body 11 to oscillate back and forth. This swinging helps the fluid inside the tank body 11 to more fully contact the tank wall, promotes the mixing and dissolution process of the fluid, and can significantly improve efficiency and effect, especially when performing operations such as gas dissolution or sample pretreatment. At the same time, the limiting component installed on the bottom plate 61 can ensure that the tank body 11 does not exceed the predetermined range during the swinging process, which not only ensures the safety of the operation, but also avoids the risk of damage to the equipment due to excessive swinging. The design of the entire oscillation assembly 6 is ingenious and practical. The overall device adopts an integrated design with a simple and compact structure and low cost. It is easy to make modular equipment and is suitable for in-situ or ectopic detection of fluids.

[0059] Preferably, Figure 6As shown, the limiting components include 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 positioning grooves are provided inside the limiting block 64. The limiting claws 63 are clamped and installed in the positioning grooves inside the limiting block 64. The limiting claws 63 are used for the vertical movement limiting clamping of the limiting block 64. The limiting block 64 is used for the interference limiting and oscillation swing limiting of the tank body 11. The two sides of the bottom end of the bridge end 12 are arc-shaped surfaces, and the interference limiting end of the limiting block 64 matches the bottom end of the bridge end 12.

[0060] Specifically, the limit block 64 is adjusted in vertical height by the limit claw 63, so that the limit block 64 and the bridge end 12 are in contact and limited or separated. When the limit block 64 and the bridge end 12 are in a separated state, the arc-shaped end of the limit 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.

[0061] A method for collecting and preprocessing dissolved trace greenhouse gases comprises the following steps:

[0062] When the tank body 11 in the main assembly 1 is not filled with fluid, the gas collecting assembly 3 is connected to the tank body 11;

[0063] A negative pressure environment is formed inside the tank body 11 by the vacuum assembly 5. When the negative pressure value inside the tank body 11 reaches a preset value by the detection assembly 4, the gas collection assembly 3 is closed to reduce gas contamination of the tank body 11 and the gas collection assembly 3.

[0064] The fluid to be treated is introduced into the tank body 11 through the liquid inlet component 2, and then a negative pressure environment is formed inside the tank body 11 through the vacuum component 5 to assist the fluid in releasing greenhouse gases;

[0065] The released greenhouse gases are collected by the gas collection assembly 3 .

[0066] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for collecting and preprocessing dissolved trace greenhouse gases, characterized in that: include: A main body component (1), the main body component (1) comprising a hollow tank body (11) with a tapered upper end, the upper end of the tank body (11) being sequentially connected to a liquid inlet pipe (13), an air guide pipe (14) and a negative pressure pipe (15), the tank body (11) being used to store fluid and release greenhouse gases; A liquid inlet assembly (2), the liquid inlet assembly (2) being connected to a liquid inlet pipe (13), the liquid inlet pipe (13) being used to introduce fluid; A gas collecting assembly (3), the gas collecting assembly (3) being connected to the gas guide pipe (14), and the gas collecting assembly (3) being used to collect 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 assembly (5), the vacuum pumping assembly (5) being connected to a negative pressure pipe (15), the vacuum pumping assembly (5) being used to form a negative pressure environment inside the tank body (11) to reduce gas pollution and simultaneously assist the fluid in releasing greenhouse gases; The vacuum pumping assembly (5) comprises a valve body (51), a negative pressure middle tube (53) and an air extraction pipe (52), wherein the valve body (51) is connected to the negative pressure tube (15), one end of the negative pressure middle tube (53) is connected to the upper end of the tank body (11), the inner wall of the negative pressure middle tube (53) is connected to a limit ring (55), a piston (54) is movably connected inside the negative pressure middle tube (53), the other end of the negative pressure middle tube (53) is connected to a sealing valve, the air extraction pipe (52) is connected to the valve body (51) and the sealing valve in sequence, 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 vacuum the tank body (11) before introducing fluid to reduce gas pollution, and the air extraction pipe (52) and the negative pressure middle tube (53) are used to separate greenhouse gases after the fluid is introduced.

2. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: A plurality of annular sealing strips are sleeved on the piston (54), and the plurality of sealing strips are arranged at equal intervals on the piston (54).

3. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: The liquid inlet assembly (2) comprises a liquid inlet needle (21), a sealing plug (22) passing through the liquid inlet needle (21), the liquid inlet needle (21) being sealed and connected to the liquid inlet pipe (13) via the sealing plug (22), the other end of the liquid inlet needle (21) being connected to a liquid inlet three-way valve (23), one end of the liquid inlet three-way valve (23) being connected to a filter (24), the filter (24) being connected to a liquid inlet hose (25), the liquid inlet three-way valve (23) being used to discharge gas from the liquid inlet hose (25) and to control the introduction of fluid into the liquid inlet needle (21).

4. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 3, characterized in that: The gas collection assembly (3) comprises a gas guide needle body (31) and a gas collection bag (33). The gas guide needle body (31) is connected to a sealing plug (22) through the sealing plug (22). The gas guide needle body (31) is sealed and connected to the liquid 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), and the gas guide three-way valve (32) is connected to the gas collection bag (33). The gas collection bag (33) is used to collect gas.

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

6. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 5, characterized in that: The detection assembly (4) further comprises a temperature sensor (42) and a liquid level sensor (43), both of which are connected to the upper end of the tank body (11). The temperature sensor (42) is used to detect the internal temperature of the tank body (11), and the liquid level sensor (43) is used to detect the liquid level of the fluid inside the tank body (11) to obtain the internal fluid capacity of the tank body (11).

7. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 1, characterized in that: The invention also includes an oscillation component (6), wherein the oscillation component (6) includes a bottom plate (61), the bottom end of the tank body (11) is connected to the bridge end (12), the upper end surface of the bottom plate (61) is connected to a connecting shaft (62), the connecting shaft (62) passes through and is movably connected to the middle part of the bridge end (12), the bottom of the bridge end (12) is movably connected to a connecting rod (66), 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, and a limiting component is installed on the bottom plate (61), the oscillation component (6) is used for the oscillation and swinging of the tank body (11), and the limiting component is used to resist and limit the tank body (11).

8. The device for collecting and preprocessing dissolved trace greenhouse gases according to claim 7, 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 positioning grooves are provided inside the limiting block (64). The limiting claws (63) are mounted in the positioning grooves inside the limiting block (64). The limiting claws (63) are used for the vertical movement limiting clamping of the limiting block (64). The limiting block (64) is used for the resistance limiting and oscillation swing limiting of the tank body (11). Both sides of the bottom end of the bridge end (12) are arc-shaped surfaces. The resistance limiting end of the limiting block (64) matches the bottom end of the bridge end (12).

9. A method for collecting and preprocessing dissolved trace greenhouse gases, applied to the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: When the tank body (11) in the main assembly (1) is not filled with fluid, the gas collecting assembly (3) is connected to the tank body (11); A negative pressure environment is formed inside the tank body (11) by using the vacuum pumping component (5), and when the negative pressure value inside the tank body (11) reaches a preset value by using the detection component (4), the gas collection component (3) is closed to reduce gas contamination of the tank body (11) and the gas collection component (3); The fluid to be pretreated is introduced into the tank body (11) through the liquid inlet component (2), and then a negative pressure environment is formed inside the tank body (11) through the vacuum component (5) to assist the fluid in releasing greenhouse gases; The released greenhouse gases are collected by the gas collection assembly (3).

Images