A dissolved gas in-situ extraction and collection device

Abstract

The present invention discloses a device for in-situ extraction and collection of dissolved gas, comprising a microporous membrane water vapor separation extraction module, a multi-interface gas circuit, a pressure-resistant cabin, an exhaust solenoid valve, a high-pressure gas storage cylinder, a pressure gauge, a control panel, a gas collecting solenoid valve, a gas collecting cylinder, and a submersible pump; the microporous membrane water vapor separation extraction module comprises a microporous metal sintered block, a sintered block support plate, a microporous membrane, a microporous membrane support block, a sealing O-ring, a compression spring, a spring compression adjustment block, and a limit block. The gas released from the high-pressure gas storage tank is used to create a headspace environment with variable pressure; the pore size of the microporous membrane is larger than that of gaseous molecules, allowing gaseous molecules to pass through quickly, while liquid molecules are blocked on the outside of the membrane. The device for in-situ extraction and collection of dissolved gas of the present invention has the advantages of being able to solve the problems that the headspace equilibrium method cannot be applied to high-pressure environments and the low separation efficiency of polymer membranes; and achieving rapid and high-precision measurement of dissolved gas.

Description

Technical Field

[0001] The present invention relates to a gas dissolution detection technology, in particular to a dissolved gas in-situ extraction and collection device. Background Art

[0002] The dissolution of gases in liquids is influenced by various factors, including the nature of the gas, temperature, and pressure. Measuring the solubility characteristics of gases in liquids is currently necessary in many fields. High-precision measurements of trace, characteristic dissolved gases in the deep sea, lakes, or other solvents can provide data support for understanding deep-sea biogeochemical cycles, surface water pollution levels, and the operating conditions of industrial equipment.

[0003] Currently, most sensors used to measure dissolved gas concentrations use water vapor separation and extraction, combined with spectroscopy, mass spectrometry, and chromatography techniques to achieve high-precision measurement of dissolved gas concentrations. As the first step in high-precision dissolved gas measurement, achieving in-situ, efficient separation of dissolved gases is a common challenge.

[0004] There are three main methods and devices for traditional water-vapor separation and extraction: headspace equilibrium, atomization equilibrium, and membrane separation. The headspace equilibrium method works by placing a liquid sample in a sealed container and heating it under a certain pressure. This releases volatile components from the sample matrix into the space above the sample (i.e., the headspace), allowing the volatile components in the liquid to reach equilibrium with the headspace gas above. The concentration of the volatile components in the liquid sample is then indirectly determined by measuring the concentration of the headspace gas after equilibrium. The basic principle of the atomization equilibrium method is that the high-pressure liquid sample passes through the microporous plate at the top of the device and is rapidly atomized, thereby increasing the contact area between the gas and liquid and accelerating the separation of gas from water. However, while headspace equilibrium and atomization equilibrium methods offer fast separation and high efficiency, they require the sample to be transferred to an ambient pressure environment, which introduces significant sampling error and can lead to unstable measurement accuracy. The basic principle of membrane separation methods is to extract dissolved gases by exploiting the selective permeability of polymer membranes to different substances (including gases). Membrane separation methods combined with high-pressure packaging can achieve water-gas separation in extremely high-pressure environments. However, due to the membrane's limited µL / min-level water-gas separation efficiency, it is difficult to ensure high spatiotemporal resolution. Summary of the Invention

[0005] The present invention aims to overcome the deficiencies in the above-mentioned prior art and to provide a dissolved gas in-situ extraction and collection device to achieve the purpose of rapid and efficient extraction of dissolved gas.

[0006] The present invention adopts the following technical solutions to solve the technical problems.

[0007] The present invention provides a dissolved gas in-situ extraction and collection device, comprising a microporous membrane water-gas separation and extraction module 1, a multi-port gas circuit 2, a pressure-resistant cabin 3, an exhaust solenoid valve 4, a high-pressure gas storage cylinder 5, a pressure gauge 6, a control panel 7, a gas collection solenoid valve, a gas collection cylinder, and a submersible pump 12;

[0008] The submersible pump 12 and the microporous membrane water vapor separation and extraction module 1 are both located outside the pressure-resistant cabin 3; the multi-port gas circuit 2, the exhaust solenoid valve 4, the high-pressure gas storage cylinder 5, the pressure gauge 6, the control panel 7, the gas collection solenoid valve and the gas collection cylinder are all arranged inside the pressure-resistant cabin 3;

[0009] The submersible pump 12 is connected to the microporous membrane water-gas separation and extraction module 1 through a water pipe, and the submersible pump 12 delivers the measured liquid into the microporous membrane water-gas separation and extraction module 1; the microporous membrane water-gas separation and extraction module 1 is connected to the multi-interface gas circuit 2 through an air circuit, and the multi-interface gas circuit 2 is connected to the high-pressure gas storage cylinder 5 through the exhaust solenoid valve 4; the gas collecting bottle is connected to the multi-interface gas circuit 2 through the gas collecting solenoid valve; the pressure gauge 6 is connected to the multi-interface gas circuit 2 for detecting the air pressure in the multi-interface gas circuit 2;

[0010] The exhaust solenoid valve 4, pressure gauge 6, and gas collecting solenoid valve are all electrically connected to the control board 7; the control board 7 collects the air pressure value in the multi-interface gas circuit 2 through the pressure gauge 6, and the control board 7 controls the on and off of the exhaust solenoid valve 4 and the gas collecting solenoid valve to control the air pressure value range in the multi-interface gas circuit 2.

[0011] The structural features of the dissolved gas in-situ extraction and collection device of the present invention are also as follows:

[0012] Furthermore, the microporous membrane water vapor separation extraction module 1 includes a microporous metal sintered block 101 , a sintered block support plate 102 , a microporous membrane 103 , a microporous membrane support block 104 , a compression spring 106 , a spring compression adjustment block 107 and a limit block 109 .

[0013] Furthermore, the microporous membrane water vapor separation and extraction module 1 also includes the sealing O-ring 105 .

[0014] Furthermore, the sealing O-ring 105 is provided between the microporous membrane support block 104 and the microporous membrane water vapor separation and extraction module body 100 .

[0015] Furthermore, the sealing O-ring 105 is provided between the microporous membrane 103 and the microporous membrane support block 104 .

[0016] Furthermore, the gas collecting bottle includes a first gas collecting bottle 8 or a second gas collecting bottle 9 .

[0017] Furthermore, the gas collecting solenoid valve includes a first gas collecting solenoid valve 10 or a second gas collecting solenoid valve 11 .

[0018] Furthermore, the first gas collecting bottle 8 is connected to the multi-interface gas circuit 2 via a first gas collecting solenoid valve 10 , and the second gas collecting bottle 9 is connected to the multi-interface gas circuit 2 via a second gas collecting solenoid valve 11 .

[0019] Furthermore, the pore diameter of the microporous membrane 103 ranges from 1 nm to 1 µm.

[0020] Furthermore, the pore size of the microporous metal sintered block gradually increases from the side close to the microporous membrane 103 to the side far away from the microporous membrane 103 .

[0021] Compared with the existing technology, the beneficial effects of the present invention are embodied in:

[0022] The present invention discloses an in-situ dissolved gas extraction and collection device, comprising a microporous membrane water-gas separation and extraction module, a multi-port gas circuit, a pressure-resistant cabin, an exhaust solenoid valve, a high-pressure gas storage cylinder, a pressure gauge, a control panel, a gas collection solenoid valve, a gas collection cylinder, and a submersible pump. The microporous membrane water-gas separation and extraction module includes a microporous metal sintered block, a sintered block support plate, a microporous membrane, a microporous membrane support block, a sealing O-ring, a compression spring, a spring compression adjustment block, and a limit block. The device utilizes gas released from the high-pressure gas storage tank to create a variable-pressure headspace environment. The microporous membrane has a pore size larger than that of gaseous molecules, allowing gaseous molecules to pass quickly while liquid molecules are blocked on the outside of the membrane.

[0023] The present invention provides an in-situ dissolved gas extraction and collection device that utilizes the gas released from a high-pressure gas storage tank to create a headspace environment with variable pressure. Combined with the characteristics that gas molecules are smaller than liquid molecules and the pore size of a microporous membrane is larger than that of gas molecules, it can achieve the purpose of allowing gas molecules to pass through quickly while liquid molecules are blocked on the outside of the membrane, thereby achieving the effect of rapid and efficient extraction of dissolved gas, solving the problem that the headspace equilibrium method cannot be applied to high-pressure environments and the problem that the separation efficiency of polymer membranes is low, and ultimately providing new ideas for rapid and high-precision measurement of dissolved gases.

[0024] The dissolved gas in-situ extraction and collection device of the present invention has the advantages of being able to solve the problems that the headspace equilibrium method cannot be applied to high-pressure environments and the low efficiency of polymer membrane separation, and achieving rapid and high-precision measurement of dissolved gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a dissolved gas in-situ extraction and collection device of the present invention.

[0026] Figure 2 This is a structural diagram of a microporous membrane water vapor separation and extraction module of a dissolved gas in-situ extraction and collection device of the present invention.

[0027] The present invention will be further described below through specific implementation methods in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0028] See also Figures 1 and 2 The present invention provides a dissolved gas in-situ extraction and collection device, comprising a microporous membrane water-gas separation and extraction module 1, a multi-port gas circuit 2, a pressure-resistant cabin 3, an exhaust solenoid valve 4, a high-pressure gas storage cylinder 5, a pressure gauge 6, a control panel 7, a gas collection solenoid valve, a gas collection cylinder, and a submersible pump 12;

[0029] The submersible pump 12 and the microporous membrane water vapor separation and extraction module 1 are both located outside the pressure-resistant cabin 3; the multi-port gas circuit 2, the exhaust solenoid valve 4, the high-pressure gas storage cylinder 5, the pressure gauge 6, the control panel 7, the gas collection solenoid valve and the gas collection cylinder are all arranged inside the pressure-resistant cabin 3;

[0030] The submersible pump 12 is connected to the microporous membrane water-gas separation and extraction module 1 through a water pipe, and the submersible pump 12 delivers the measured liquid into the microporous membrane water-gas separation and extraction module 1; the microporous membrane water-gas separation and extraction module 1 is connected to the multi-interface gas circuit 2 through an air circuit, and the multi-interface gas circuit 2 is connected to the high-pressure gas storage cylinder 5 through the exhaust solenoid valve 4; the gas collecting bottle is connected to the multi-interface gas circuit 2 through the gas collecting solenoid valve; the pressure gauge 6 is connected to the multi-interface gas circuit 2 for detecting the air pressure in the multi-interface gas circuit 2;

[0031] The exhaust solenoid valve 4, pressure gauge 6, and gas collecting solenoid valve are all electrically connected to the control board 7; the control board 7 collects the air pressure value in the multi-interface gas circuit 2 through the pressure gauge 6, and the control board 7 controls the on and off of the exhaust solenoid valve 4 and the gas collecting solenoid valve to control the air pressure value range in the multi-interface gas circuit 2.

[0032] like Figure 1As shown, during the operation of the in-situ dissolved gas extraction and collection device of the present invention, the water sample inlet and outlet 108 of the microporous membrane water vapor separation and extraction module 1 is directed toward the bottom of the water body. The exhaust solenoid valve 4 opens for a period of time and then closes, allowing non-target gases in the high-pressure gas storage cylinder 5 to be released into the multi-port gas circuit 2, forming a high-pressure headspace between the microporous membrane water vapor separation and extraction module 1 and the multi-port gas circuit 2. The non-target gases can be gases such as N2 and He. A submersible pump 12 extracts the liquid to be tested and delivers it into the microporous metal sintered block 101 of the microporous membrane water vapor separation and extraction module 1. The dissolved gas and water in the microporous metal sintered block 101 separate and converge on the surface of the microporous membrane 103. Due to the concentration difference, the gas molecules diffuse into the interior of the microporous membrane 103. Since water exists in liquid form, the diameter of the liquid water molecules is larger than the pores of the microporous membrane 103, and the liquid water molecules are blocked on the outside of the microporous membrane 103. After a period of time, the concentration of gas molecules inside and outside the microporous membrane 103 reaches equilibrium. At this point, the first gas collection solenoid valve 10 (or second gas collection solenoid valve 11) is opened. Under the influence of external water pressure, the gas in the microporous membrane water vapor separation and extraction module 1 and the multi-port gas circuit 2 is squeezed into the first gas collection bottle 8 (or second gas collection bottle 9). During this period, the control board 7 collects the pressure reading from the pressure gauge 6 in real time, indicating the pressure of the high-pressure headspace formed between the microporous membrane water vapor separation and extraction module 1 and the multi-port gas circuit 2. The control board 7 works in conjunction with the exhaust solenoid valve 4, the first gas collection solenoid valve 10, and the second gas collection solenoid valve 11 to maintain the pressure range of the high-pressure headspace. The compression spring 106 and its mounting space provide a restoring force, and the large gas compression space prevents excessive pressure differentials between the inside and outside of the microporous membrane 103 during rapid changes in external pressure. Based on the pressure readings collected by the pressure gauge 6, the control board controls the exhaust solenoid valve 4 in real time to release gas from the high-pressure gas storage cylinder into the headspace.

[0033] In specific implementation, the microporous membrane water vapor separation extraction module 1 includes a microporous metal sintered block 101, a sintered block support plate 102, a microporous membrane 103, a microporous membrane support block 104, a compression spring 106, a spring compression adjustment block 107 and a limit block 109.

[0034] A compression spring 106 with appropriate resilience is installed between the microporous membrane support block 104 and the spring compression adjustment block 107 to maintain the initial state under normal pressure and to act as a buffer when the external environmental pressure suddenly changes.

[0035] In a specific implementation, the microporous membrane water vapor separation and extraction module 1 further includes the sealing O-ring 105 .

[0036] In a specific implementation, the sealing O-ring 105 is provided between the microporous membrane support block 104 and the microporous membrane water vapor separation and extraction module body 100 .

[0037] During specific implementation, the sealing O-ring 105 is provided between the microporous membrane 103 and the microporous membrane support block 104 .

[0038] In a specific implementation, the gas collecting bottle includes a first gas collecting bottle 8 or a second gas collecting bottle 9 .

[0039] In a specific implementation, the gas collecting solenoid valve includes a first gas collecting solenoid valve 10 or a second gas collecting solenoid valve 11 .

[0040] In the dissolved gas in-situ extraction and collection device of the present invention, gas collecting bottles and gas collecting solenoid valves are arranged in a one-to-one correspondence, i.e., the number of gas collecting bottles and gas collecting solenoid valves is the same, with each gas collecting bottle being equipped with a gas collecting solenoid valve. In specific implementations, different numbers of gas bottles can be provided based on actual usage needs, i.e., the number of gas bottles can be increased or decreased as needed. During use, different numbers of gas bottles are opened at different times to collect gas at different depths.

[0041] In a specific implementation, the first gas collecting bottle 8 is connected to the multi-interface gas circuit 2 via a first gas collecting solenoid valve 10 , and the second gas collecting bottle 9 is connected to the multi-interface gas circuit 2 via a second gas collecting solenoid valve 11 .

[0042] In a specific implementation, the pore diameter of the microporous membrane 103 ranges from 1 nm to 1 µm.

[0043] The pores of microporous membrane 103 have a diameter between 1 nm and 1 µm, allowing them to easily pass dissolved gas molecules (such as CH₄, CO₂, and CO) while blocking liquid solvent molecules (such as water). Microporous membrane 103 is made of a hydrophobic material, including but not limited to polytetrafluoroethylene, polyurethane, polyester, polyamide, and polypropylene.

[0044] The microporous membrane 103 is attached between the microporous membrane support block 104 and the microporous metal sintered block 101. When the external environmental pressure becomes high, the microporous membrane support block 104 is used to improve the mechanical strength. When the external environmental pressure becomes low, the microporous metal sintered block 101 is used to improve the mechanical strength.

[0045] The microporous membrane support block 104 and the microporous membrane water vapor separation and extraction module body 100 are radially sealed, and their relative positions can be changed to change the physical headspace. The microporous membrane support block 104 and the microporous membrane water vapor separation and extraction module body are sealed by a sealing O-ring 105.

[0046] In a specific implementation, the pore diameter of the microporous metal sintered block gradually increases from the side close to the microporous membrane 103 to the side far away from the microporous membrane 103 .

[0047] The pore size of the microporous metal sintered block 101 is gradually changing. The pore size on the side close to the microporous membrane 103 is 1 μm to 10 μm, and the pore size on the other side is 30 μm to 100 μm, which can ensure air permeability and strength while preventing sediment blockage.

[0048] The microporous metal sintered block 101 is a foam metal structure, and the materials include foam titanium, foam copper, etc.

[0049] In practice, the high-pressure gas cylinder contains a low-solubility, high-pressure gas, a non-target gas. This non-target gas, such as N₂ or He, is less likely to experience significant headspace pressure loss due to dissolution of the gas in water. The high-pressure gas is more than twice as high as the headspace pressure, allowing the headspace pressure to be dynamically adjusted by releasing the high-pressure gas from the cylinder.

[0050] The volume of the high-pressure gas storage cylinder is more than twice the total volume of the gas collection cylinder. The gas in the high-pressure headspace (i.e., the microporous membrane water-gas separation and extraction module and the multi-interface gas path gas consumption space) can be compressed by more than 5 times.

[0051] The working process of the dissolved gas in-situ extraction and collection device of the present invention includes the following steps.

[0052] Step 1: When the device of the present invention is immersed in the liquid to be measured, the external environmental pressure continues to rise as the immersion depth changes; at this time, the pressure gauge continuously collects pressure values, which reflect the spatial changes of the high-pressure headspace area and the current environmental pressure value, as shown in the following formula (1).

[0053] P 1 V 1 =P 2 V 2 (1)

[0054] In formula (1), P 1 is the initial pressure of the high-pressure headspace, V 1 is the initial volume of the high-pressure headspace; P 2 is the headspace pressure after the high-pressure headspace area is compressed; V 2 It is the headspace volume after compression of the high-pressure headspace area.

[0055] Step 2: When P 2 ≥2 P 1When the pressure in the high-pressure headspace rises to a predetermined value, exhaust solenoid valve 4 closes. This means the pressure in the high-pressure headspace is higher than the ambient pressure, and the physical space in the high-pressure headspace has returned to its initial state. This dynamically adjusts the headspace pressure in the high-pressure headspace, minimizing the internal and external pressure differentials experienced by the microporous membrane.

[0056] Step 3: After the device reaches the predetermined depth, it is allowed to rest for a period of time. A submersible pump extracts a sample of the liquid being tested and delivers it to the microporous membrane water-gas separation extraction module. The sample flows through the microporous metal sintered block 101. The numerous pores in the microporous metal sintered block 101 increase the contact area between the dissolved gas and the liquid, accelerating the separation rate of the dissolved gas from the sample solution and converging on the microporous membrane 103. Driven by the concentration difference, the dissolved gas collected on the microporous membrane 103 diffuses into the high-pressure headspace region and eventually reaches a dynamic equilibrium, where the gas concentration in the high-pressure headspace region is consistent with the gas concentration collected by the microporous membrane 103.

[0057] Step 4: Open the gas collection solenoid valve and use an empty gas collection bottle to collect the dissolved gas in the high-pressure headspace. After 5 seconds, close the gas collection solenoid valve. At this point, the in-situ collection of dissolved gas under a specific pressure environment over a certain period of time has been completed. To ensure the safety of the microporous membrane 103, the gas volume in the gas collection bottle is designed to be between 2 / 5 and 4 / 5 of the compressible volume of the high-pressure headspace. This ensures that the compressible headspace volume of the device can effectively eliminate the pressure difference between the inside and outside of the membrane when the gas collection solenoid valve is opened.

[0058] The gas storage volume of the gas collecting bottle is less than 4 / 5 of the headspace variation of the high-pressure headspace zone, so as to ensure that the microporous membrane can withstand a smaller internal and external pressure difference during the gas collection process.

[0059] Step 5: After closing the gas collecting solenoid valve, quickly open the exhaust solenoid valve 4 to release the gas from the high-pressure gas storage cylinder to the high-pressure headspace area, and close the exhaust solenoid valve 4 when the headspace pressure in the high-pressure headspace area rises.

[0060] Step 6: Repeat the above steps 3 to 5 multiple times to collect dissolved gas at different times or depths.

[0061] In practice, the pressure resistance of the gas collection and exhaust solenoid valves is 1.2 times higher than the working environment pressure to ensure system safety. The upper limit of the pressure gauge is higher than the upper limit of the gas storage pressure of the collection bottle.

[0062] The present invention's in-situ dissolved gas extraction and collection device utilizes an exhaust solenoid valve, a high-pressure gas storage cylinder, and a microporous membrane water-vapor separation and extraction module to create a variable-pressure, high-pressure headspace. A solution sample drawn by a submersible pump passes through the microporous membrane water-vapor separation and extraction module, where it exchanges gas with the high-pressure headspace.

[0063] The dissolved gas in-situ extraction and collection device of the present invention has the advantages of being able to solve the problems that the headspace equilibrium method cannot be applied to high-pressure environments and the low efficiency of polymer membrane separation, and achieving rapid and high-precision measurement of dissolved gas.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0065] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A dissolved gas in-situ extraction and collection device, characterized in that: It comprises a microporous membrane water-gas separation and extraction module (1), a multi-interface gas circuit (2), a pressure-resistant cabin (3), an exhaust solenoid valve (4), a high-pressure gas storage cylinder (5), a pressure gauge (6), a control panel (7), a gas collection solenoid valve, a gas collection cylinder and a submersible pump (12); The submersible pump (12) and the microporous membrane water-gas separation and extraction module (1) are both located outside the pressure-resistant cabin (3); the multi-port gas circuit (2), the exhaust solenoid valve (4), the high-pressure gas storage cylinder (5), the pressure gauge (6), the control panel (7), the gas collection solenoid valve and the gas collection cylinder are all arranged inside the pressure-resistant cabin (3); The submersible pump (12) is connected to the microporous membrane water vapor separation and extraction module (1) via a water pipe, and the submersible pump (12) delivers the liquid to be tested into the microporous membrane water vapor separation and extraction module (1); the microporous membrane water vapor separation and extraction module (1) is connected to the multi-interface gas circuit (2) via a gas circuit, and the multi-interface gas circuit (2) is connected to the high-pressure gas storage cylinder (5) via the exhaust solenoid valve (4); the gas collecting cylinder is connected to the multi-interface gas circuit (2) via the gas collecting solenoid valve; the pressure gauge (6) is connected to the multi-interface gas circuit (2) for detecting the air pressure in the multi-interface gas circuit (2); The exhaust solenoid valve (4), the pressure gauge (6), and the gas collecting solenoid valve are all electrically connected to the control board (7); the control board (7) controls the range of the air pressure value in the multi-interface air path (2) by the air pressure value in the multi-interface air path (2) collected by the pressure gauge (6), and the exhaust solenoid valve (4) and the gas collecting solenoid valve are controlled by the control board (7) to control the on and off of the exhaust solenoid valve (4) and the gas collecting solenoid valve; the microporous membrane water-gas separation and extraction module (1) comprises a microporous metal sintered block (101), a sintered block support plate (102), a microporous membrane (103), a microporous membrane support block (104), a compression spring (106), a spring compression adjustment block (107), and a limit block (109); the pore size of the pores of the microporous metal sintered block ranges from The size gradually increases from the side close to the microporous membrane (103) to the side away from the microporous membrane (103); the microporous membrane water vapor separation and extraction module (1) also includes a sealing O-ring (105); a sealing O-ring (105) is provided between the microporous membrane support block (104) and the microporous membrane water vapor separation and extraction module body (100), and the relative positions of the two are variable so as to change the physical space of the headspace; a compression spring (106) with appropriate rebound force is installed between the microporous membrane support block (104) and the spring compression adjustment block (107) to maintain the initial state under normal pressure and to play a buffering role when the external environmental pressure suddenly changes; the microporous membrane (103) is attached between the microporous membrane support block (104) and the microporous metal sintered block (101).

2. The dissolved gas in-situ extraction and collection device according to claim 1, characterized in that: The sealing O-ring (105) is provided between the microporous membrane (103) and the microporous membrane support block (104).

3. The dissolved gas in-situ extraction and collection device according to claim 1, characterized in that: The gas collecting bottle comprises a first gas collecting bottle (8) or a second gas collecting bottle (9).

4. The dissolved gas in-situ extraction and collection device according to claim 3, characterized in that: The gas collecting solenoid valve comprises a first gas collecting solenoid valve (10) or a second gas collecting solenoid valve (11).

5. The dissolved gas in-situ extraction and collection device according to claim 4, characterized in that: The first gas collecting bottle (8) is connected to the multi-interface gas circuit (2) via a first gas collecting solenoid valve (10), and the second gas collecting bottle (9) is connected to the multi-interface gas circuit (2) via a second gas collecting solenoid valve (11).

6. The dissolved gas in-situ extraction and collection device according to claim 1, characterized in that: The diameter of the microporous membrane (103) ranges from 1 nm to 1 µm.

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