Dissolved gas in-situ extraction and collection device

Abstract

The invention discloses an in-situ extraction and collection device for dissolved gas. The in-situ extraction and collection device comprises a microporous membrane water-gas separation and extraction module, a multi-interface gas circuit, a pressure-resistant cabin body, an exhaust electromagnetic valve, a high-pressure gas storage steel cylinder, a pressure gauge, a control panel, a gas collection electromagnetic valve, a gas collection cylinder and a submersible pump, the microporous membrane water-gas separation and extraction module comprises a microporous metal sintering block, a sintering block supporting plate, a microporous membrane, a microporous membrane supporting block, a sealing O ring, a compression spring, a spring compression amount adjusting block and a limiting block. A headspace environment with variable pressure is created by utilizing gas released by the high-pressure gas storage tank; the pore diameter of the microporous membrane is larger than that of gaseous molecules, the gaseous molecules can quickly pass through the microporous membrane, and liquid molecules are blocked outside the membrane. The dissolved gas in-situ extraction and collection device has the advantages that the problems that a headspace equilibrium method cannot be applied to a high-pressure environment and the separation efficiency of a polymer membrane is low can be solved; the advantages of fast and high-precision measurement of dissolved gas and the like are realized.

Description

Technical Field

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

[0002] The dissolution of gas in liquid is affected by various factors such as the nature of the gas, temperature, and pressure. At present, in many fields, it is necessary to measure the dissolution characteristics of gas in liquid. High-precision measurement of trace marker dissolved gases in deep sea, lakes or other solvents can provide data support for understanding the deep sea biogeochemical cycle process, the pollution degree of surface water bodies, and the working state of industrial equipment.

[0003] Currently, most sensors for measuring dissolved gas achieve high-precision measurement of dissolved gas concentration by combining water-gas separation and extraction with spectroscopy, mass spectrometry, and chromatography techniques. As the first step in high-precision measurement of dissolved gas, how to achieve in-situ and efficient separation of dissolved gas is a common difficult point.

[0004] There are mainly three traditional methods and devices for water-gas separation and extraction: headspace equilibrium method, atomization equilibrium method, and membrane separation method. The working principle of the headspace equilibrium method is: placing a liquid sample in a closed container, heating it under a certain pressure, so that the volatile components in the sample are released from the sample matrix into the space above the sample (i.e., the headspace), making the volatile components in the liquid reach equilibrium with the headspace gas above, and then indirectly measuring the concentration of the volatile components in the liquid sample by measuring the concentration of the headspace gas after equilibrium. The basic principle of the atomization equilibrium method is: high-pressure liquid sample is quickly atomized after passing through the microporous plate at the top of the device, thereby increasing the contact area between gas and liquid and accelerating the separation of gas from water. However, although the headspace equilibrium method and the atomization equilibrium method have the characteristics of fast separation and high efficiency, they need to transfer the sample to the atmospheric environment for operation, thus introducing sampling errors that cannot be ignored, so there is a problem of unstable measurement accuracy. The basic principle of the membrane separation method is: using the selective permeability of the polymer membrane to different substances (including gases) to achieve the extraction of dissolved gas. The membrane separation method combined with a high-pressure resistant encapsulation method can achieve water-gas separation in an extremely high-pressure environment, but limited by the water-gas separation efficiency of the membrane at the µL / min level, it is difficult to ensure high spatio-temporal resolution. Summary of the Invention

[0005] The present invention aims to avoid the deficiencies in the above-mentioned existing technologies and provides a device for in-situ extraction and collection of dissolved gas 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 an in-situ extraction and collection device for dissolved gases, comprising a microporous membrane water-vapor separation and extraction module 1, a multi-interface gas path 2, a pressure-resistant cabin 3, an exhaust solenoid valve 4, a high-pressure gas storage steel cylinder 5, a pressure gauge 6, a control board 7, a gas collection solenoid valve, a gas collection cylinder and a submersible pump 12; 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-interface gas path 2, the exhaust solenoid valve 4, the high-pressure gas storage steel cylinder 5, the pressure gauge 6, the control board 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 through a water pipe, and the submersible pump 12 sends the liquid to be measured 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 path 2 through a gas path, and the multi-interface gas path 2 is connected to the high-pressure gas storage steel cylinder 5 through the exhaust solenoid valve 4; the gas collection cylinder is connected to the multi-interface gas path 2 through the gas collection solenoid valve; the pressure gauge 6 is connected to the multi-interface gas path 2 for detecting the air pressure inside the multi-interface gas path 2; The exhaust solenoid valve 4, the pressure gauge 6 and the gas collection solenoid valve are all electrically connected to the control board 7; the control board 7 collects the air pressure value inside the multi-interface gas path 2 through the pressure gauge 6, and the control board 7 controls the opening and closing of the exhaust solenoid valve 4 and the gas collection solenoid valve to control the range of the air pressure value inside the multi-interface gas path 2.

[0008] The structural features of the in-situ extraction and collection device for dissolved gases according to the present invention also lie in: Further, the microporous membrane water-vapor 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 amount adjustment block 107 and a limit block 109.

[0009] Further, the microporous membrane water-vapor separation and extraction module 1 further comprises the sealing O-ring 105.

[0010] Further, a sealing O-ring 105 is arranged between the microporous membrane support block 104 and the microporous membrane water-vapor separation and extraction module main body 100.

[0011] Further, a sealing O-ring 105 is arranged between the microporous membrane 103 and the microporous membrane support block 104.

[0012] Further, the gas collection cylinder comprises a first gas collection cylinder 8 or a second gas collection cylinder 9.

[0013] Further, the gas collection solenoid valve comprises a first gas collection solenoid valve 10 or a second gas collection solenoid valve 11.

[0014] Further, the first gas collecting cylinder 8 is connected to the multi-interface gas path 2 through a first gas collecting solenoid valve 10, and the second gas collecting cylinder 9 is connected to the multi-interface gas path 2 through a second gas collecting solenoid valve 11.

[0015] Further, the pore diameter range of the microporous membrane 103 is 1 nm to 1 µm.

[0016] Further, the pore size of the pores of the microporous metal sintered block gradually increases from the side close to the microporous membrane 103 to the side far from the microporous membrane 103.

[0017] Compared with the prior art, the beneficial effects of the present invention are reflected in: The present invention discloses a device for in-situ extraction and collection of dissolved gases, including a microporous membrane water-vapor separation and extraction module, a multi-interface gas path, a pressure-resistant cabin body, an exhaust solenoid valve, a high-pressure gas storage steel cylinder, a pressure gauge, a control board, a gas collecting solenoid valve, a gas collecting cylinder, and a submersible pump; the microporous membrane water-vapor 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 amount 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 diameter of the microporous membrane is larger than that of gaseous molecules, allowing gaseous molecules to pass through quickly, while liquid molecules are blocked outside the membrane.

[0018] The device for in-situ extraction and collection of dissolved gases of the present invention uses the gas released from the high-pressure gas storage tank to create a headspace environment with variable pressure, and combines the characteristics that the size of gas molecules is smaller than that of liquid molecules and the pore diameter of the microporous membrane is larger than that of gaseous molecules, so as to achieve the purpose of allowing gaseous molecules to pass through quickly while liquid molecules are blocked outside the membrane, thereby achieving the effect of rapid and efficient extraction of dissolved gases, solving the problems that the headspace equilibrium method cannot be applied to high-pressure environments and the polymer membrane separation efficiency is low, and finally providing a new idea for rapid and high-precision measurement of dissolved gases.

[0019] The device for in-situ extraction and collection of dissolved gases of the present invention has the advantages of solving the problems that the headspace equilibrium method cannot be applied to high-pressure environments and the polymer membrane separation efficiency is low, and realizing rapid and high-precision measurement of dissolved gases. Brief Description of the Drawings

[0020] Figure 1 It is a structural diagram of a device for in-situ extraction and collection of dissolved gases of the present invention.

[0021] Figure 2 It is a structural diagram of the microporous membrane water-vapor separation and extraction module of a device for in-situ extraction and collection of dissolved gases of the present invention.

[0022] The following further illustrates the present invention through specific embodiments and in conjunction with the drawings. Specific Embodiments

[0023] See Figures 1 to 2 , the present invention provides a device for in-situ extraction and collection of dissolved gas, comprising a microporous membrane water-vapor separation and extraction module 1, a multi-interface gas path 2, a pressure-resistant cabin 3, an exhaust solenoid valve 4, a high-pressure gas storage cylinder 5, a pressure gauge 6, a control board 7, a gas collection solenoid valve, a gas collection cylinder, and a submersible pump 12; 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-interface gas path 2, the exhaust solenoid valve 4, the high-pressure gas storage cylinder 5, the pressure gauge 6, the control board 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 through a water pipe, and the submersible pump 12 sends the liquid to be measured 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 path 2 through a gas path, and the multi-interface gas path 2 is connected to the high-pressure gas storage cylinder 5 through the exhaust solenoid valve 4; the gas collection cylinder is connected to the multi-interface gas path 2 through the gas collection solenoid valve; the pressure gauge 6 is connected to the multi-interface gas path 2 for detecting the air pressure inside the multi-interface gas path 2; The exhaust solenoid valve 4, the pressure gauge 6, and the gas collection solenoid valve are all electrically connected to the control board 7; the control board 7 collects the air pressure value inside the multi-interface gas path 2 through the pressure gauge 6, and the control board 7 controls the opening and closing of the exhaust solenoid valve 4 and the gas collection solenoid valve to control the air pressure value range inside the multi-interface gas path 2.

[0024] As Figure 1As shown in the figure, during the operation of a dissolved gas in-situ 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 faces the bottom of the water body. After the exhaust solenoid valve 4 is opened for a period of time and then closed, the non-target gas in the high-pressure gas storage cylinder 5 is released into the multi-interface gas path 2, forming a high-pressure headspace between the microporous membrane water-vapor separation and extraction module 1 and the multi-interface gas path 2. The non-target gas can be gases such as N2 and He. The submersible pump 12 extracts the liquid to be measured and sends it into the microporous metal sintered block 101 of the microporous membrane water-vapor separation and extraction module 1. In the microporous metal sintered block 101, the dissolved gas is separated from the water and accumulates on the surface of the microporous membrane 103. Under the action of the concentration difference, gas molecules diffuse into the interior of the microporous membrane 103. Since water exists in a liquid state, the diameter of liquid water molecules is larger than the pores of the microporous membrane 103, and the liquid water molecules are blocked outside the microporous membrane 103. After a period of time, the gas molecule concentrations inside and outside the microporous membrane 103 reach equilibrium. At this time, the first gas collection solenoid valve 10 (or the second gas collection solenoid valve 11) is opened, and under the action of the external water pressure, the gas in the microporous membrane water-vapor separation and extraction module 1 and the multi-interface gas path 2 is squeezed into the first gas collection cylinder 8 (or the second gas collection cylinder 9). During this period, the control board 7 continuously collects the pressure value of the pressure gauge 6, that is, the pressure value of the high-pressure headspace formed between the microporous membrane water-vapor separation and extraction module 1 and the multi-interface gas path 2. The control board 7 is linked 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. At the same time, the compression spring 106 and its installation space provide a restoring force and a large gas compression space to prevent the pressure difference between the inside and outside of the microporous membrane 103 from being too large when the external pressure changes rapidly. The control board controls the exhaust solenoid valve 4 to release the gas from the high-pressure gas storage cylinder into the headspace according to the pressure value collected by the pressure gauge 6.

[0025] In specific implementation, the microporous membrane water-vapor separation and 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 amount adjustment block 107, and a limit block 109.

[0026] A compression spring 106 with an appropriate resilience is installed between the microporous membrane support block 104 and the spring compression amount adjustment block 107 to maintain the initial state under normal pressure and play a buffering role when the external environmental pressure suddenly changes.

[0027] In specific implementation, the microporous membrane water-vapor separation and extraction module 1 further includes the sealing O-ring 105.

[0028] In specific implementation, a sealing O-ring 105 is provided between the microporous membrane support block 104 and the main body 100 of the microporous membrane water-vapor separation and extraction module.

[0029] During specific implementation, a sealing O-ring 105 is provided between the microporous membrane 103 and the microporous membrane support block 104.

[0030] During specific implementation, the gas collecting bottle includes a first gas collecting bottle 8 or a second gas collecting bottle 9.

[0031] During specific implementation, the gas collecting solenoid valve includes a first gas collecting solenoid valve 10 or a second gas collecting solenoid valve 11.

[0032] In the dissolved gas in-situ extraction and collection device of the present invention, the gas collecting bottle and the gas collecting solenoid valve are arranged in one-to-one correspondence, that is, the number of gas collecting bottles and gas collecting solenoid valves is the same, and each gas collecting bottle is configured with a gas collecting solenoid valve. During specific implementation, different numbers of gas bottles can be set according to actual usage needs, that is, the number of gas bottles can be increased or decreased as required. During the use of different numbers of gas bottles, the opening times are different to collect gases at different depths.

[0033] During specific implementation, the first gas collecting bottle 8 is connected to the multi-interface gas path 2 through the first gas collecting solenoid valve 10, and the second gas collecting bottle 9 is connected to the multi-interface gas path 2 through the second gas collecting solenoid valve 11.

[0034] During specific implementation, the pore diameter range of the microporous membrane 103 is 1 nm to 1 µm.

[0035] The micropore diameter of the microporous membrane 103 is between 1 nm and 1 µm, which is easy for the molecules of dissolved gases (such as CH4, CO2, CO, etc.) to pass through, and can block the molecules of liquid solvents (such as water molecules). The material of the microporous membrane 103 is a hydrophobic material, including but not limited to materials such as polytetrafluoroethylene, polyurethane, polyester, polyamide, and polypropylene.

[0036] The microporous membrane 103 is attached between the microporous membrane support block 104 and the microporous metal sintered block 101, and relies on the microporous membrane support block 104 to improve mechanical strength when the external environmental pressure becomes higher, and relies on the microporous metal sintered block 101 to improve mechanical strength when the external environmental pressure becomes lower.

[0037] The microporous membrane support block 104 and the microporous membrane water-vapor separation extraction module main body 100 adopt a radial sealing method, and their relative positions can be changed to change the headspace physical space. The seal between the microporous membrane support block 104 and the microporous membrane water-vapor separation extraction module main body is achieved through the sealing O-ring 105.

[0038] During specific implementation, the pore diameter of the pores of the microporous metal sintered block gradually increases from the side close to the microporous membrane 103 to the side far from the microporous membrane 103.

[0039] The pore size of the microporous metal sintered block 101 gradually changes. 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 not only ensure the air permeability and strength, but also prevent sediment blockage.

[0040] The microporous metal sintered block 101 has a foam metal structure, and the materials include foam titanium, foam copper, etc.

[0041] During specific implementation, a high-pressure gas with low solubility is stored in the high-pressure gas storage cylinder, and this high-pressure gas is a non-target gas. The non-target gas can be gases such as N2 or He, so the headspace pressure in the high-pressure headspace area is not easily lost too much due to the gas dissolving in water. The pressure of the high-pressure gas is more than twice that of the headspace area, and thus the headspace pressure can be dynamically adjusted by releasing the high-pressure gas in the high-pressure gas storage cylinder.

[0042] The volume of the high-pressure gas storage cylinder is more than twice the total volume of the gas collection cylinder. The compressible amount of the gas in the space of the high-pressure headspace area (i.e., the gas-water separation and extraction module of the microporous membrane and the gas consumption space of the multi-interface gas circuit) reaches more than 5 times.

[0043] The working process of a dissolved gas in-situ extraction and collection device of the present invention includes the following steps.

[0044] Step 1: When the device of the present invention is immersed in the liquid to be measured, as the immersion depth changes, the external environmental pressure continuously rises; at this time, the pressure gauge continuously collects the pressure value, and this pressure value reflects the space change of the high-pressure headspace area and the current environmental pressure value, as shown in the following formula (1).

[0045] P 1 V 1 =P 2 V 2 (1) In formula (1), where P 1 is the initial pressure of the high-pressure headspace area, V 1 is the initial volume of the high-pressure headspace area; P 2 is the headspace pressure after the high-pressure headspace area is compressed; V 2 is the headspace volume after the high-pressure headspace area is compressed.

[0046] Step 2: When P 2 ≥2 P 1When the time is up, the exhaust solenoid valve 4 releases the high-pressure gas in the high-pressure gas storage cylinder into the high-pressure headspace area, and closes the exhaust solenoid valve 4 when the pressure in the high-pressure headspace area rises to a predetermined pressure value. At this time, it means that the pressure in the high-pressure headspace area is higher than the external environmental pressure and the physical space in the high-pressure headspace area has returned to the initial state. Thus, the headspace pressure in the high-pressure headspace area is dynamically adjusted, and the microporous membrane bears a smaller internal and external pressure difference.

[0047] Step 3: After the device of the present invention reaches the predetermined depth, it is left to stand for a period of time. The solution sample of the liquid to be measured is pumped by the submersible pump into the microporous membrane water-gas separation and extraction module. The solution sample flows out after passing through the microporous metal sintered block 101. Since there are a large number of pores in the microporous metal sintered block 101, the contact area between the dissolved gas and the liquid is increased, the separation rate of the dissolved gas from the solution sample is accelerated, and the dissolved gas converges 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 area and finally reaches dynamic equilibrium, that is, the gas concentration in the high-pressure headspace area is the same as the gas concentration collected on the microporous membrane 103.

[0048] Step 4: Open the gas collection solenoid valve, and collect the dissolved gas in the high-pressure headspace area with an empty gas collection bottle. After 5 seconds, close the gas collection solenoid valve. At this time, the in-situ collection of the dissolved gas under a certain time and a specific pressure environment has been completed. At the same time, to ensure the safety of the microporous membrane 103, it is required in the design that the gas volume in the gas collection bottle is between 2 / 5 and 4 / 5 of the compressible volume in the high-pressure headspace area, so that when the gas collection solenoid valve is opened instantaneously, the compressible headspace volume of the device can achieve the effect of eliminating the pressure difference inside and outside the membrane.

[0049] The gas storage volume of the gas collection bottle is less than 4 / 5 of the headspace volume change in the high-pressure headspace area, so as to ensure that the microporous membrane bears a smaller internal and external pressure difference during the gas collection process.

[0050] Step 5: After closing the gas collection solenoid valve, quickly open the exhaust solenoid valve 4 to release the gas in the high-pressure gas storage cylinder into the high-pressure headspace area, and close the exhaust solenoid valve 4 when the headspace pressure in the high-pressure headspace area rises.

[0051] Step 6: Repeat the process of Step 3 to Step 5 multiple times to collect the dissolved gas at different times or different depths.

[0052] During specific implementation, the pressure resistance performance of the gas collection solenoid valve and the exhaust solenoid valve is 1.2 times higher than the working environment pressure to ensure the safety of the system. The upper limit of the pressure measurement of the pressure gauge is higher than the upper limit pressure of the gas storage in the collection bottle.

[0053] An in-situ extraction and collection device for dissolved gases according to the present invention creates a high-pressure headspace with variable pressure by using an exhaust solenoid valve, a high-pressure gas storage steel cylinder, and a microporous membrane water-vapor separation and extraction module. After the solution sample pumped by a submersible pump passes through the microporous membrane water-vapor separation and extraction module, it can exchange gases with the gases in the high-pressure headspace.

[0054] The in-situ extraction and collection device for dissolved gases according to 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 realizing rapid and high-precision measurement of dissolved gases.

[0055] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An in-situ extraction and collection device for dissolved gas, characterized in that It includes a microporous membrane water-vapor separation and extraction module (1), a multi-interface gas path (2), a pressure-resistant cabin (3), an exhaust solenoid valve (4), a high-pressure gas storage steel cylinder (5), a pressure gauge (6), a control board (7), a gas collection solenoid valve, a gas collection cylinder, and a submersible pump (12); 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-interface gas path (2), the exhaust solenoid valve (4), the high-pressure gas storage steel cylinder (5), the pressure gauge (6), the control board (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) through a water pipe; the microporous membrane water-vapor separation and extraction module (1) and the pressure gauge (6) for detecting the air pressure in the multi-interface gas path (2) are both connected to the multi-interface gas path (2) through a gas path; the multi-interface gas path (2) is connected to the high-pressure gas storage steel cylinder (5) through the exhaust solenoid valve (4); the gas collection cylinder is connected to the multi-interface gas path (2) through the gas collection solenoid valve; The exhaust solenoid valve, the pressure gauge, and the gas collection solenoid valve are all electrically connected to the control board; the control board collects the air pressure value in the multi-interface gas path through the pressure gauge, and controls the on-off of the exhaust solenoid valve and the gas collection solenoid valve to control the range of the air pressure value in the multi-interface gas path.

2. The in-situ extraction and collection device for dissolved gas according to claim 1, characterized in that, The microporous membrane water-vapor separation and 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 amount adjustment block (107), and a limit block (109).

3. The in-situ extraction and collection device for dissolved gas according to claim 1, characterized in that, The microporous membrane water-vapor separation and extraction module (1) further includes a sealing O-ring (105).

4. The in-situ extraction and collection device for dissolved gas according to claim 2, characterized in that, A sealing O-ring (105) is arranged between the microporous membrane support block (104) and the microporous membrane water-vapor separation and extraction module main body (100).

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

6. The in-situ extraction and collection device for dissolved gas according to claim 1, characterized in that, The gas collection cylinder includes a first gas collection cylinder (8) or a second gas collection cylinder (9).

7. An in-situ extraction and collection device for dissolved gas according to claim 6, characterized in that, The gas collection solenoid valve includes a first gas collection solenoid valve (10) or a second gas collection solenoid valve (11).

8. The in-situ extraction and collection device for dissolved gas according to claim 7, characterized in that, The first gas collection cylinder (8) is connected to the multi-interface gas path (2) through the first gas collection solenoid valve (10), and the second gas collection cylinder (9) is connected to the multi-interface gas path (2) through the second gas collection solenoid valve (11).

9. The in-situ extraction and collection device for dissolved gas according to claim 2, characterized in that, The pore diameter range of the microporous membrane (103) is 1 nm to 1 µm.

10. The in-situ extraction and collection device for dissolved gas according to claim 2, characterized in that, The pore diameter of the pores of the microporous metal sintered block gradually increases from the side close to the microporous membrane (103) to the side far from the microporous membrane (103).

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