Gas-liquid separator and hydrogen production system

Abstract

The utility model relates to a gas-liquid separator and a hydrogen production system. The gas-liquid separator comprises a device main body, a cooling pipe and an ultrasonic engine, a containing cavity is formed in the device body and used for containing liquid to be separated. The device main body is provided with a mounting port communicated with the accommodating cavity; at least one part of the cooling pipe is assembled in the accommodating cavity of the device main body, and a water inlet and a water outlet of the cooling pipe are arranged outside the device main body through the mounting port; protruding structures are arranged in the circumferential direction of the cooling pipe, and the multiple protruding structures are evenly distributed in the axial direction of the cooling pipe. The ultrasonic engine is installed on the cooling pipe and located outside the device body. In the circulating heat absorption process of the cooling pipe, the ultrasonic engine can vibrate the cooling pipe, the contact area of the cooling pipe and the gas is increased, alkaline water vapor in the gas is condensed into alkaline water, the gas dissolved in the alkaline water is separated, bubbles in the alkaline water are dispersed, and the gas purity is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production by electrolysis of water, and in particular to a gas-liquid separator and a hydrogen production system. Background Art

[0002] Hydrogen energy is an efficient, clean and environmentally friendly energy source and an important support for achieving carbon neutrality. At present, the electrolysis of water is mature and widely used in the current commercial hydrogen production technology. Among them, alkaline water electrolysis is an important technology for large-scale hydrogen production and one of the most mature hydrogen production technologies. At present, alkaline electrolyzers face the problem of low power operation, reduced gas purity and automatic system shutdown in the process of coupling with renewable energy.

[0003] In the fields of photovoltaic hydrogen production and wind power hydrogen production, the power supply voltage is unstable, resulting in fluctuations in power supply. In this case, there is a certain probability of facing the risk of low-power operation, which will lead to low gas purity, system shutdown, and inability to continue hydrogen production. Summary of the invention

[0004] Based on this, it is necessary to provide a gas-liquid separator and a hydrogen production system to address the problem of how to broaden the low-power operation range of alkaline water electrolysis.

[0005] One aspect of the present application provides a gas-liquid separator, comprising:

[0006] A device body, wherein the device body has a containing cavity inside, and the containing cavity is used to contain the liquid to be separated; the device body is provided with a mounting port connected to the containing cavity;

[0007] A cooling pipe, at least a portion of which is mounted in the accommodating cavity of the device body, wherein a water inlet and a water outlet of the cooling pipe are arranged outside the device body through the mounting port;

[0008] An ultrasonic motor is mounted on the cooling tube and is located outside the device body.

[0009] In one embodiment, the wall surface of the device body includes an inner surface layer, an intermediate layer and an outer surface layer connected in sequence from the inside to the outside.

[0010] In one embodiment, the sum of the thickness of the inner surface layer and the thickness of the middle layer is 100 μm to 300 μm.

[0011] In one embodiment, the inner surface layer is configured as a nano-ceramic layer; the middle layer is configured as an acrylic and rubber composite material layer and has a loose porous layer structure.

[0012] In one embodiment, it also includes:

[0013] The gas concentration detector is installed in the accommodating cavity, and the lowest height of the gas concentration detector in the accommodating cavity is higher than the highest liquid level mark of the liquid to be separated.

[0014] In one of the embodiments, a protrusion structure is provided along the circumference of the cooling tube, and a plurality of the protrusion structures are evenly distributed along the axial direction of the cooling tube.

[0015] In one embodiment, it also includes:

[0016] The damping interface is installed between the mounting port and the cooling pipe.

[0017] In one embodiment, the damping interface is a sleeve-shaped structure; the damping interface is configured as a rubber interface.

[0018] In one embodiment, the power of the ultrasonic generator is 200W to 50000W, the frequency is 20kHz to 500000kHz, and the amplitude is 20μm to 150μm.

[0019] Another aspect of the present application provides a hydrogen production system, comprising the gas-liquid separator as described above.

[0020] In the present application, an ultrasonic engine is installed on the cooling tube. During the cooling tube's cyclic heat absorption process, the ultrasonic engine can vibrate the cooling tube, thereby increasing the contact area between the cooling tube and the gas, and efficiently condensing the alkaline water vapor in the gas into alkaline water. At the same time, the gas dissolved in the alkaline water and the bubbles dispersed in the alkaline water can be quickly separated, thereby effectively improving the gas purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a gas-liquid separator provided in one embodiment of the present application is shown.

[0022] Figure 2 Shows Figure 1 Schematic diagram of the locally enlarged structure of A in the middle.

[0023] Figure 3 Shows Figure 1 Schematic diagram of the partially enlarged structure of B.

[0024] Figure Number:

[0025] 100-device body;

[0026] 110-installation port;

[0027] 120-wall;

[0028] 121 - inner surface layer;

[0029] 122-middle layer;

[0030] 123 - outer surface layer;

[0031] 130-accommodating cavity;

[0032] 200-cooling pipe;

[0033] 210-water inlet;

[0034] 220-water outlet;

[0035] 230-protruding structure;

[0036] 300-ultrasonic generator;

[0037] 400-damping interface;

[0038] 500-Gas concentration detector;

[0039] 600-Liquid to be separated. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0046] See also Figure 1 , Figure 1The schematic diagram of the structure of the gas-liquid separator provided by one embodiment of the present application is shown. A gas-liquid separator provided by one embodiment of the present application includes: a device body 100, a cooling tube 200 and an ultrasonic generator 300; the device body 100 has a receiving cavity 130 inside, and the receiving cavity 130 is used to receive the liquid 600 to be separated; the device body is provided with an installation port 110 connected to the receiving cavity 130; at least a part of the cooling tube 200 is assembled in the receiving cavity of the device body, wherein the water inlet and the water outlet of the cooling tube are arranged outside the device body 100 through the installation port 110; the ultrasonic generator 300 is installed on the cooling tube 200 and the ultrasonic generator 300 is located outside the device body 100.

[0047] In some embodiments, an ultrasonic generator 300 is installed on the cooling pipe 200 near the water inlet 210 of the cooling pipe 200. In this embodiment, the ultrasonic generator 300 is installed on the cooling pipe 200. During the heat absorption cycle of the cooling pipe 200, the ultrasonic generator 300 can vibrate the cooling pipe 200, increase the contact area between the cooling pipe 200 and the gas, and efficiently condense the alkaline water vapor in the gas into alkaline water. At the same time, the gas dissolved in the alkaline water and the bubbles dispersed in the alkaline water can be quickly separated, effectively improving the purity of the gas.

[0048] Optionally, the ultrasonic generator 300 is located outside the accommodating cavity 130 .

[0049] Optionally, the ultrasonic generator 300 is located inside the accommodating cavity 130 .

[0050] In some embodiments, an ultrasonic generator 300 is installed on the cooling pipe 200 near the water outlet 220 of the cooling pipe 200. The ultrasonic generator 300 is installed on the cooling pipe 200. During the heat absorption cycle of the cooling pipe 200, the ultrasonic generator 300 can vibrate the cooling pipe 200, increase the contact area between the cooling pipe 200 and the gas, and efficiently condense the alkaline water vapor in the gas into alkaline water. At the same time, the gas dissolved in the alkaline water and the bubbles dispersed in the alkaline water can be quickly separated, effectively improving the purity of the gas.

[0051] Optionally, the ultrasonic generator 300 is located outside the accommodating cavity 130 .

[0052] Optionally, the ultrasonic generator 300 is located inside the accommodating cavity 130 .

[0053] In some embodiments, two ultrasonic generators 300 are respectively installed on the cooling pipe 200 near the water inlet 210 and the cooling pipe 200 near the water outlet 220. The ultrasonic generator 300 is installed on the cooling pipe 200. During the heat absorption cycle of the cooling pipe 200, the ultrasonic generator 300 can vibrate the cooling pipe 200, increase the contact area between the cooling pipe 200 and the gas, and efficiently condense the alkaline water vapor in the gas into alkaline water. At the same time, the gas dissolved in the alkaline water and the bubbles dispersed in the alkaline water can be quickly separated, effectively improving the purity of the gas.

[0054] Optionally, the two ultrasonic generators 300 are both located outside the accommodating cavity 130 .

[0055] Optionally, the two ultrasonic generators 300 are both located inside the accommodating cavity 130 .

[0056] Optionally, one ultrasonic generator 300 is located outside the accommodating cavity 130 , and the other ultrasonic generator 300 is located inside the accommodating cavity 130 .

[0057] See also Figure 2 As shown, Figure 2 Shows Figure 1 A is a partial enlarged structural diagram of FIG. In some embodiments, the wall surface 120 of the device body 100 includes an inner surface layer 121, an intermediate layer 122, and an outer surface layer 123 connected in sequence from the inside to the outside.

[0058] Optionally, the inner surface layer 121 is configured as a nano-ceramic layer. Here, the inner surface layer 121 can ensure that the alkaline water is fully infiltrated in the accommodating cavity 130, so that there is no gas remaining in the area where the alkaline water contacts the inner wall of the container cavity, so that the inner wall surface of the accommodating cavity 130 has good anti-corrosion performance and can also improve durability.

[0059] Optionally, the middle layer 122 is configured as an acrylic and rubber composite material layer, and has a loose porous layer structure. The loose porous structure of the middle layer 122 can absorb the energy brought by the ultrasonic vibration, avoid the wall surface of the accommodating cavity 130 from cracking due to long-term vibration stress, improve the stability of the gas-liquid separator movement, and also extend the service life of the device.

[0060] Optionally, the sum of the thickness of the inner surface layer 121 and the thickness of the intermediate layer 122 is 130 μm to 300 μm. Preferably, the sum of the thickness of the inner surface layer 121 and the thickness of the intermediate layer 122 is 300 μm.

[0061] Alternatively, the middle layer 122 and the inner surface layer 121 may be coated at once on the outer surface layer 123. The coating thicknesses of the middle layer 122 and the inner surface layer 121 may be different.

[0062] Optionally, the inner surface layer 121 may also be made of other materials with hydrophilic surfaces, which are not listed here one by one.

[0063] Optionally, the outer surface layer 123 may be made of metal materials, such as carbon steel, stainless steel, fiberglass, etc., which are not listed here one by one.

[0064] Optionally, the outer surface layer 123 may be made of glass fiber reinforced composite plastic to ensure that the wall surface of the accommodating cavity 130 has good corrosion resistance.

[0065] Optionally, the surface of the outer surface layer 123 can also be sandblasted, mainly using compressed air as a power to form a high-speed jet beam to spray material (garnet sand, copper ore sand, quartz sand, corundum, iron sand, Hainan sand) at high speed onto the area on the surface of the outer surface layer 123 that needs to be processed, so that the appearance or shape of the surface of the outer surface layer 123 changes. After sandblasting, dirt such as rust on the surface of the outer surface layer 123 can be removed, and a rough surface can be formed on the surface of the outer surface layer 123. By replacing abrasives of different particle sizes, the bonding force between the outer surface layer 123 and the intermediate layer 122 can be greatly improved.

[0066] The wall structure of the cooling pipe is introduced in detail. Figure 3 As shown, Figure 3 Shows Figure 1 The schematic diagram of the partially enlarged structure of B in the figure. The wall of the cooling pipe is provided with a protruding structure along the circumference of the cooling pipe. Multiple protruding structures are provided on the wall from the water inlet 210 of the cooling pipe 200 to the water outlet 220 of the cooling pipe 200, and the multiple protruding structures are evenly distributed along the axial direction of the cooling pipe. The provision of the protruding structure on the wall of the cooling pipe can increase the surface area of ​​the cooling pipe, which is conducive to absorbing vibration energy and extending the service life of the cooling pipe.

[0067] Optionally, the cross-section of the protruding structure 230 is triangular, rectangular, semi-elliptical, or semi-circular. The protruding structure 230 may also be other regular or irregular shapes known to those skilled in the art, which will not be listed one by one here, nor will they be limited to the above examples.

[0068] Optionally, no gap may be provided between two adjacent protrusion structures 230 along the axial direction of the cooling pipe. Then, the plurality of protrusion structures are continuously and evenly distributed along the axial direction of the cooling pipe, which is conducive to fully increasing the surface area of ​​the cooling pipe, fully absorbing vibration energy, and effectively extending the service life of the cooling pipe.

[0069] Optionally, a gap may be provided between two axially adjacent protrusion structures 230 of the cooling pipe, and the sizes of the gaps are the same, which is beneficial to uniformly increase the surface area of ​​the cooling pipe, uniformly absorb vibration energy, and effectively extend the service life of the cooling pipe.

[0070] Optionally, a gap can be set between two axially adjacent protrusion structures 230 of the cooling tube, and each gap is different. Among them, the gap set between two axially adjacent protrusion structures 230 of the cooling tube can gradually decrease along the axial gap of the cooling tube, that is, the depth of the cooling tube extending into the liquid to be separated gradually increases, and the size of the gap can gradually decrease, which is conducive to dynamically increasing the surface area of ​​the cooling tube according to the relationship between the cooling tube and the liquid to be separated, more fully absorbing vibration energy, and effectively extending the service life of the cooling tube.

[0071] Optionally, a gap can be set between two axially adjacent protrusion structures 230 of the cooling tube, and each gap is different. Among them, the gap set between two axially adjacent protrusion structures 230 of the cooling tube can gradually increase along the axial gap of the cooling tube, that is, the depth of the cooling tube extending into the accommodating cavity gradually increases, and the size of the gap can gradually increase, which is beneficial to dynamically increase the surface area of ​​the cooling tube according to the relationship between the cooling tube and the alkaline water vapor, and is beneficial to efficiently condense the alkaline water vapor in the gas into alkaline water, more fully absorb the vibration energy, and effectively extend the service life of the cooling tube.

[0072] In some embodiments, referring to the diagram, the water inlet 210 of the cooling tube 200 to the water outlet 220 of the cooling tube 200 is in a U-shaped structure, wherein one side of the water inlet 210 of the cooling tube 200 is spirally coiled, and one side of the water outlet 220 of the cooling tube 200 is passed through the spiral coil, thereby increasing the contact area between the cooling tube and the liquid to be separated without increasing the overall footprint of the cooling tube, thereby improving the cooling efficiency and fully absorbing vibration energy, thereby effectively extending the service life of the cooling tube.

[0073] Optionally, the water inlet 210 of the cooling pipe 200 to the water outlet 220 of the cooling pipe 200 is in a U-shaped structure, wherein one side of the water outlet 220 of the cooling pipe 200 is spirally coiled, and one side of the water inlet 210 of the cooling pipe 200 is passed through the spiral coil, thereby increasing the contact area between the cooling pipe and the liquid to be separated without increasing the overall space occupied by the cooling pipe, thereby improving the cooling efficiency and fully absorbing vibration energy, thereby effectively extending the service life of the cooling pipe.

[0074] Optionally, the water inlet 210 of the cooling pipe 200 to the water outlet 220 of the cooling pipe 200 is in a U-shaped structure, and one side of the water inlet 210 of the cooling pipe 200 is spirally coiled, and one side of the water outlet 220 of the cooling pipe 200 is also spirally coiled, and the spiral coils arranged on the side of the water inlet 210 of the cooling pipe 200 and the spiral coils arranged on the side of the water outlet 220 of the cooling pipe 200 are arranged in an interlaced manner, so as to increase the contact area between the cooling pipe and the liquid to be separated, improve the cooling efficiency, and at the same time fully absorb the vibration energy, thereby effectively extending the service life of the cooling pipe.

[0075] In some embodiments, the gas concentration detector 500 is further included. The gas concentration detector 500 is installed in the accommodating cavity 130, and the lowest height of the gas concentration detector 500 in the accommodating cavity 130 is higher than the highest liquid level mark of the liquid 600 to be separated.

[0076] The gas concentration detected by the gas concentration detector 500 is inversely proportional to the power, frequency and amplitude of the ultrasonic generator 300. That is, when the gas concentration detector 500 detects a low gas concentration, the power, frequency and amplitude of the ultrasonic generator 300 need to be increased accordingly. When the gas concentration detector 500 detects a high gas concentration, the power, frequency and amplitude of the ultrasonic generator 300 need to be reduced accordingly.

[0077] In some embodiments, it also includes: a controller. The controller is electrically connected to the gas concentration detector 500 and the ultrasonic generator, respectively. The controller receives the real-time gas concentration in the containing cavity 130 detected by the gas concentration detector 500. When the real-time gas concentration is less than the preset gas concentration, it is judged that the gas concentration in the retaining wall containing cavity is low. At this time, it is necessary to increase the power, frequency and amplitude of the ultrasonic generator under the control of the controller. Or the controller receives the real-time gas concentration in the containing cavity 130 detected by the gas concentration detector 500. When the real-time gas concentration is greater than the preset gas concentration, it is judged that the gas concentration in the retaining wall containing cavity is high. At this time, it is necessary to reduce the power, frequency and amplitude of the ultrasonic generator under the control of the controller.

[0078] In some embodiments, the interference fit between the ultrasonic generator 300 and the cooling tube 200 can ensure a tight fit between the ultrasonic generator 300 and the cooling tube 200, and prevent the ultrasonic generator 300 from loosening or falling off during vibration.

[0079] In some embodiments, the ultrasonic generator 300 is connected to the cooling tube 200 by threads, which can ensure a secure installation between the ultrasonic generator 300 and the cooling tube 200 and prevent the ultrasonic generator 300 from loosening or falling off during vibration.

[0080] In some embodiments, it also includes: a damping interface. The damping interface is installed between the mounting port 110 and the cooling pipe 200. The damping interface 400 is a sleeve-shaped structure; the damping interface 400 is configured as a rubber interface. By providing the damping interface 400 between the mounting port 110 of the accommodating cavity 130 and the cooling pipe 200, the ultrasonic generator is prevented from causing vibration wear to the position in contact with the mounting port 110 of the device body 100 during operation, thereby extending the service life of the gas-liquid separator and ensuring the stability of the operation of the gas-liquid separator.

[0081] In some embodiments, the power of the ultrasonic generator 300 is 200 W to 50000 W. Preferably, the ultrasonic generator 30000.

[0082] In some embodiments, the frequency of the ultrasonic generator 300 is 20kHz to 500000kHz. Preferably, the frequency of the ultrasonic generator is 500000kHz.

[0083] In some embodiments, the amplitude of the ultrasonic generator 300 is 20 μm to 150 μm. Preferably, the amplitude of the ultrasonic generator 300 is 100 μm.

[0084] In one embodiment of the present application, a hydrogen production system is also provided, comprising a gas-liquid separator, an alkaline electrolyzer and a post-processing unit as described above. The alkaline electrolyzer, the gas-liquid separator and the post-processing unit are connected and arranged in sequence. In this embodiment, the alkaline electrolyzer is mainly used to electrolyze water to produce hydrogen and oxygen. The post-processing unit is mainly used to remove alkaline liquid from the gas-liquid mixture of hydrogen and oxygen produced after electrolysis.

[0085] When the operating power of the alkaline electrolytic cell is 20%, the power of the ultrasonic generator 300 is 30000W, the frequency of the ultrasonic generator 300 is 300000kHz, and the amplitude of the ultrasonic generator is 100μm, the purity of hydrogen detected by the gas concentration detector 500 is 99.21%, and the purity of oxygen is 99.09%. When the operating power of the alkaline electrolytic cell is 20%, and the ultrasonic generator 300 is not started, the purity of hydrogen detected by the gas concentration detector 500 is 97.17%, and the purity of oxygen is 97.05%.

[0086] When the alkaline electrolyzer is operated at 50% power, the power of the ultrasonic generator 300 is 10000W, the frequency of the ultrasonic generator 300 is 50000kHz, and the amplitude of the ultrasonic generator is 50μm, the purity of hydrogen detected by the gas concentration detector 500 is 99.40%, and the purity of oxygen is 99.15%. When the alkaline electrolyzer is operated at 50% power and the ultrasonic generator 300 is not started, the purity of hydrogen detected by the gas concentration detector 500 is 98.83%, and the purity of oxygen is 98.13%.

[0087] The gas-liquid separator provided in this embodiment is started when the operating power of the alkaline electrolyzer is less than 50%, which can ensure that the purity of hydrogen and oxygen obtained in the post-processing part is not reduced and avoid the problem of automatic shutdown.

[0088] In some embodiments, when the operating power of the alkaline electrolyzer is 20%, the power of the ultrasonic generator 300 is 30000W, the frequency of the ultrasonic generator 300 is 300000kHz, and the amplitude of the ultrasonic generator is 100μm, the purity of hydrogen detected by the gas concentration detector 500 is 99.21%, and the purity of oxygen is 99.09%. When the operating power of the alkaline electrolyzer is 50%, the power of the ultrasonic generator 300 is 10000W, the frequency of the ultrasonic generator 300 is 50000kHz, and the amplitude of the ultrasonic generator is 50μm, the purity of hydrogen detected by the gas concentration detector 500 is 99.40%, and the purity of oxygen is 99.15%. It can be seen that as the power, frequency, and amplitude of the gas-liquid separator decrease, the purity of hydrogen and oxygen detected by the gas concentration detector 500 increases. It can be seen that the power, frequency, and amplitude of the gas-liquid separator are inversely proportional to the purity of hydrogen and oxygen detected by the gas concentration detector 500.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A gas-liquid separator, characterized in that: include: A device body, wherein the device body has a containing cavity inside, and the containing cavity is used to contain the liquid to be separated; the device body is provided with a mounting port connected to the containing cavity; A cooling pipe, at least a portion of which is mounted in the accommodating cavity of the device body, wherein a water inlet and a water outlet of the cooling pipe are arranged outside the device body through the mounting port; An ultrasonic motor is mounted on the cooling tube and is located outside the device body.

2. The gas-liquid separator according to claim 1, characterized in that: The wall surface of the device body comprises an inner surface layer, an intermediate layer and an outer surface layer which are connected in sequence from the inside to the outside.

3. The gas-liquid separator according to claim 2, characterized in that: The sum of the thickness of the inner surface layer and the thickness of the intermediate layer is 100 μm to 300 μm.

4. The gas-liquid separator according to claim 1, characterized in that: Also includes: The gas concentration detector is installed in the accommodating cavity, and the lowest height of the gas concentration detector in the accommodating cavity is higher than the highest liquid level mark of the liquid to be separated.

5. The gas-liquid separator according to claim 1, characterized in that: A protrusion structure is provided along the circumference of the cooling pipe, and a plurality of the protrusion structures are evenly distributed along the axial direction of the cooling pipe.

6. The gas-liquid separator according to claim 1, characterized in that: Also includes: A damping interface is installed between the installation port and the cooling pipe.

7. The gas-liquid separator according to claim 6, characterized in that: The damping interface is a sleeve-shaped structure; the damping interface is configured as a rubber interface.

8. The gas-liquid separator according to claim 1, characterized in that: The power of the ultrasonic generator is 200W to 50000W, the frequency is 20kHz to 500000kHz, and the amplitude is 20μm to 150μm.

9. A hydrogen production system, characterized in that: Comprising the gas-liquid separator as claimed in any one of claims 1 to 8.

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