Micro-honeycomb array tube bundle composite LNG (liquefied natural gas) gas-liquid mixing device and method thereof

Abstract

The invention relates to the field of LNG operation, and discloses a micro honeycomb array tube bundle composite LNG gas-liquid mixing device and a method thereof.The micro honeycomb array tube bundle composite LNG gas-liquid mixing device comprises a boil-off gas inlet section, and boil-off gas enters the device through the boil-off gas inlet section; the forced mixing and dissolving cavity is arranged at the rear part of the boil-off gas inlet section, and a front partition plate is arranged between the forced mixing and dissolving cavity and the boil-off gas inlet section; the array tube bundle micro honeycomb tubes are uniformly distributed in the forced mixing and dissolving cavity to form an array tube bundle area, a microbubble generating cavity is arranged in the array tube bundle area, and the front end of the microbubble generating cavity is arranged on the front partition plate; the dispersed turbulence mixing cavity is arranged at the rear part of the forced mixing and dissolving cavity, a rear partition plate is arranged between the forced mixing and dissolving cavity and the dispersed turbulence mixing cavity, the forced mixing and dissolving cavity is incompletely isolated from the dispersed turbulence mixing cavity through the rear partition plate, and the rear end of the microbubble generating cavity is arranged on the rear partition plate; and the LNG outlet section is arranged at the tail end of the dispersed turbulent flow mixing cavity and is used for discharging the LNG reaching the liquid state rate of 100%.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG operation, and in particular to a micro honeycomb array tube bundle composite LNG gas-liquid mixing device and a method thereof. Background Art

[0002] In LNG plants and stations such as LNG liquefaction plants, LNG receiving stations, and LNG storage stations, LNG with an average daily evaporation rate of 10% by mass is usually involved. Due to the absorption of environmental heat and the heat generated by the operating equipment, it is continuously gasified to form boil-off gas. The treatment of boil-off gas has always been a thorny problem in LNG plants and stations. So far, there are three main technical solutions for the treatment of boil-off gas: the first is to further compress and pressurize the boil-off gas to the pressure of the external transmission pipeline, usually from dozens of kilopascals to more than a hundred times. The accompanying problem is that it brings huge power consumption and often does not have the facilities of the external transmission pipeline, so it is difficult to become a universal technical solution. The second is to use a cold box liquefaction device to directly liquefy the boil-off gas into LNG and enter the LNG process facility. However, the accompanying problems are also huge power consumption, high investment costs, and the large daily fluctuation range of the boil-off gas generation makes it difficult for the cold box liquefaction device to operate stably, making it difficult to become a universal technical solution. The third is to use the existing LNG pressurization in the existing process to form a supercooled state, condense the boil-off gas through a gas-liquid heat exchanger to form LNG, and enter the LNG process facility. This is the current universal technical solution. But the existing problems are also quite obvious:

[0003] 1) The existing gas-liquid heat exchanger is large in size, about ten meters in height, and the investment and construction costs are relatively high, reaching several million yuan;

[0004] 2) The existing gas-liquid heat exchanger has low efficiency, and the liquid-gas mixing ratio is usually 12-16. It has a narrow adaptability to large changes in the amount of evaporation gas generated. When the LNG output volume is low, part of the evaporation gas cannot be condensed.

[0005] 3) The existing gas-liquid heat exchanger operation control is relatively manual. Even if the integrated control logic of temperature control, pressure control and liquid level control is adopted, it is difficult to put it into automatic operation due to the narrow adaptability to the large load changes of evaporation gas generation, and the operating efficiency is low. Summary of the invention

[0006] In view of the above problems, the object of the present invention is to provide a micro-honeycomb array tube bundle composite LNG gas-liquid mixing device and method thereof, which can improve the efficiency of heat exchange between LNG and evaporated gas and the efficiency of condensation.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a micro honeycomb array tube bundle composite LNG gas-liquid mixing device, which includes: a vapor gas inlet section, through which vapor gas enters the interior of the device; a forced mixing and dissolving chamber, which is arranged at the rear of the vapor gas inlet section and is connected to the vapor gas inlet section as a whole, and a front baffle is arranged between the two, and the vapor gas inlet section is sealed and isolated from the forced mixing and dissolving chamber by the front baffle; an array tube bundle micro honeycomb tube, which is arranged in a plurality of pieces and is evenly distributed in the forced mixing and dissolving chamber to form an array tube bundle area, and a micro bubble generating chamber is arranged in the array tube bundle area, and the front end of the micro bubble generating chamber is arranged on the front baffle; a dispersed turbulent mixing chamber, which is arranged at the rear of the forced mixing and dissolving chamber, is connected to the forced mixing and dissolving chamber as a whole, and a rear baffle is arranged between the forced mixing and dissolving chamber, and the forced mixing and dissolving chamber is incompletely isolated from the dispersed turbulent mixing chamber by the rear baffle, and the rear end of the micro bubble generating chamber is arranged on the rear baffle; an LNG outlet section, which is arranged at the end of the dispersed turbulent mixing chamber, and discharges the LNG after reaching a liquid rate of 100%.

[0008] Furthermore, the front end of the evaporation gas inlet section is provided with an evaporation gas inlet, and the top and bottom of the evaporation gas inlet section are respectively provided with an evaporation gas inlet section exhaust pipe and an evaporation gas inlet section liquid discharge pipe.

[0009] Furthermore, the array tube bundle micro honeycomb tube is fixed to the cavity wall inside the micro bubble generating cavity by welding through the array tube bundle support;

[0010] The array tube bundle support adopts a circular structure; a plurality of array tube bundle micro honeycomb tubes are connected to form an array tube bundle through a plurality of circular array tube bundle supports, and the space outside the array tube bundle is a forced mixing and dissolving chamber;

[0011] The microbubble generating chamber and the forced mixing and dissolving chamber are not completely sealed and isolated but are in contact with each other.

[0012] Furthermore, a plurality of regularly arranged honeycomb micropores are densely distributed on the tube wall of the micro honeycomb tube of the array tube bundle, and the honeycomb micropores evenly penetrate the tube wall of the micro honeycomb tube of the array tube bundle.

[0013] Furthermore, an LNG inlet and an LNG inlet section exhaust pipe are provided at the top of the forced mixing and dissolving chamber;

[0014] The LNG inlet and the forced mixing and dissolving chamber are arranged vertically or at an angle of 30° to 90°;

[0015] An LNG inlet section discharge pipe is arranged at the bottom of the forced mixing and dissolving chamber 10 .

[0016] Furthermore, SK-type spiral blades and / or SX-type dispersion structures are arranged in the dispersed turbulence mixing chamber.

[0017] Furthermore, the SK type spiral blade is formed by welding conventional single-channel left spiral blades and right spiral blades, and is fixedly connected to the inner wall of the dispersed turbulent mixing chamber;

[0018] The SX type dispersion structure adopts an X-shaped steel sheet structure composed of cross-bars and is fixedly connected to the inner wall of the dispersion turbulent mixing chamber.

[0019] Furthermore, an LNG outlet section exhaust pipe is provided at the top of the dispersed turbulent mixing chamber; and an LNG outlet section drain pipe is provided at the bottom of the dispersed turbulent mixing chamber.

[0020] Furthermore, each component of the device is made of austenitic duplex stainless steel of 304, 304L, 316 or 316L grades.

[0021] A micro-honeycomb array tube bundle composite LNG gas-liquid mixing method is implemented based on the above-mentioned micro-honeycomb array tube bundle composite LNG gas-liquid mixing device, which comprises: evaporation gas enters from the evaporation gas inlet and enters into the micro-honeycomb tube of the array tube bundle through the evaporation gas inlet section; the evaporation gas is ejected from the honeycomb micropores on the tube wall of the micro-honeycomb tube of the array tube bundle, and a large number of bubbles are quickly generated on the outside of the tube wall of the micro-honeycomb tube of the array tube bundle with the LNG entering from the top LNG inlet, and the bubbles are densely distributed in the array tube bundle area to form a micro-bubble generating cavity; in the micro-bubble generating cavity, a large number of bubbles are quickly absorbed, collapsed and condensed into liquid LNG under the heat and mass transfer of supercooled LNG; a small number of bubbles that are not absorbed enter the outside of the micro-bubble generating cavity In the forced mixing and dissolving chamber surrounded by the LNG, a large amount of supercooled LNG exists and completes the absorption and phase change condensation of the remaining bubbles; LNG enters from the LNG inlet, and enters the forced mixing and dissolving chamber and the microbubble generating chamber in turn, and performs heat and mass transfer with the evaporated gas ejected from the micro-honeycomb tubes of the array tube bundle, completing the absorption and phase change condensation of the evaporated gas; after the evaporated gas completes condensation in the microbubble generating chamber and the forced mixing and dissolving chamber, it passes through the rear baffle together with the LNG and enters the dispersed turbulent mixing chamber; in the dispersed turbulent mixing chamber, under the radial dispersed flow guidance of the SK-type spiral blades and / or the SX-type dispersed structure, it is further fully mixed and heat exchanged, and after reaching a liquid rate of 100%, it flows through the LNG outlet section and flows out through the LNG outlet.

[0022] The present invention adopts the above technical solution, which has the following advantages:

[0023] 1. The micro-honeycomb array tube bundle composite LNG gas-liquid mixing device of the present invention is based on microbubble dynamics and adopts a composite structure of microbubble generation, forced mixing and dissolution, and dispersed turbulent mixing based on different heat exchange technology principles, thereby achieving higher efficiency of LNG and evaporated gas mixed heat exchange and higher efficiency of condensation.

[0024] 2. The present invention can significantly reduce the size of heat exchanger equipment, reduce equipment construction costs, adapt to a wider range of gas-liquid mixing ratios, and provide simpler and more achievable operation control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of a micro honeycomb array tube bundle composite LNG gas-liquid mixing device according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the array tube bundle structure in an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the tube wall structure of the array tube bundle micro honeycomb tube in an embodiment of the present invention;

[0028] Reference numerals:

[0029] 1-evaporation gas inlet; 2-evaporation gas inlet section exhaust pipe; 3-evaporation gas inlet section drain pipe; 4-evaporation gas inlet section; 5-LNG inlet; 6-LNG inlet section exhaust pipe; 7-LNG inlet section drain pipe; 8-array tube bundle micro-honeycomb tube; 9-microbubble generating chamber; 10-forced mixing and dissolving chamber; 11-front baffle; 12-rear baffle; 13-array tube bundle support frame; 14-SK type spiral blade; 15-SX type dispersion structure; 16-dispersed turbulent mixing chamber; 17-LNG outlet section exhaust pipe; 18-LNG outlet section drain pipe; 19-LNG outlet section; 20-LNG outlet; 21-cavity wall of microbubble generating chamber; 22-tube wall of array tube bundle micro-honeycomb tube; 23-honeycomb micropores. DETAILED DESCRIPTION

[0030] At present, there are two main measures for improving the existing gas-liquid heat exchanger: the first measure is to add one or more pre-cooling links in front of the existing gas-liquid heat exchanger to reduce the temperature of the evaporating gas to reduce the liquid-gas ratio required after entering the recondenser; but this measure undoubtedly increases the complexity of the process and the improvement effect is not obvious. The second measure is to optimize the automatic control logic of the existing gas-liquid heat exchanger, and improve the adaptability of the gas-liquid heat exchanger to large changes in the evaporating gas generation load through a more complex optimization algorithm; but this measure also increases the complexity of the process and the improvement effect is not obvious.

[0031] In order to solve the problems existing in the aforementioned prior art, the present invention is directed to a condensing device and method for forming a condensed uniform liquid by mixing liquid LNG and gaseous evaporated gas in LNG plants and stations such as LNG liquefaction plants and LNG receiving stations, and proposes a micro-honeycomb array tube bundle composite LNG gas-liquid mixing device. The micro-honeycomb array tube bundle composite LNG gas-liquid mixing device is based on microbubble dynamics and adopts a composite structure based on different heat exchange technology principles of microbubble generation, forced mixing and dissolution, and dispersed turbulent mixing. The present invention realizes forced mixing heat exchange and efficient condensation of LNG and evaporated gas, has a small volume, a wide range of gas-liquid mixing ratio adaptability, and the entire process is completed automatically, achieving the technical goals of efficient heat exchange condensation and simple control.

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] In one embodiment of the present invention, Figures 1 to 3 As shown, a micro honeycomb array tube bundle composite LNG gas-liquid mixing device is provided, which is related to the heat exchange between LNG and boil-off gas and the efficient condensation of boil-off gas in LNG liquefaction plants, LNG receiving stations, and LNG storage stations. In this embodiment, the device includes:

[0035] The evaporated gas inlet section 4, through which the evaporated gas enters the interior of the device;

[0036] The forced mixing and dissolving chamber 10 is arranged at the rear of the evaporation gas inlet section 4, and is connected to the evaporation gas inlet section 4 as a whole, and a front partition plate 11 is arranged between the two, and the evaporation gas inlet section 4 and the forced mixing and dissolving chamber 10 are sealed and isolated by the front partition plate 11;

[0037] The array tube bundle micro honeycomb tube 8 is provided in a plurality of pieces and is evenly distributed in the forced mixing and dissolving chamber 10 to form an array tube bundle area, and a micro bubble generating chamber 9 is provided in the array tube bundle area, and the front end of the micro bubble generating chamber 9 is provided on the front baffle 11;

[0038] The dispersed turbulent mixing chamber 16 is arranged at the rear of the forced mixing and dissolving chamber 10, connected to the forced mixing and dissolving chamber 10 as a whole, and a rear partition 12 is arranged between the forced mixing and dissolving chamber 10, and the forced mixing and dissolving chamber 10 is incompletely isolated from the dispersed turbulent mixing chamber 16 by the rear partition 12, and the rear end of the microbubble generating chamber 9 is arranged on the rear partition 12;

[0039] The LNG outlet section 19 is disposed at the end of the dispersed turbulent mixing chamber 16 to discharge the LNG after reaching 100% liquid rate.

[0040] In the above embodiment, the front end of the evaporative gas inlet section 4 is provided with an evaporative gas inlet 1, and the top and bottom of the evaporative gas inlet section 4 are respectively provided with an evaporative gas inlet section exhaust pipe 2 and an evaporative gas inlet section drain pipe 3 for emergency exhaust and emergency drain.

[0041] In the above embodiment, the array tube bundle micro honeycomb tube 8 is welded and fixed to the cavity wall 21 inside the micro bubble generating cavity 9 through the array tube bundle support 13. The array tube bundle support 13 adopts a circular structure. A plurality of array tube bundle micro honeycomb tubes 8 form an array tube bundle through a plurality of circular array tube bundle supports 13. The space outside the array tube bundle is a forced mixing and dissolving cavity 10.

[0042] The microbubble generating chamber 9 and the forced mixing and dissolving chamber 10 are not completely sealed and isolated but are in contact with each other.

[0043] In this embodiment, a plurality of regularly arranged honeycomb micropores 23 are densely distributed on the tube wall 22 of the array tube bundle micro-honeycomb tube. The honeycomb micropores 23 evenly penetrate the tube wall 22 of the array tube bundle micro-honeycomb tube. The diameter of the honeycomb micropores 23 is 0.5 mm to 1.5 mm, the hole spacing is 3 to 10 mm, and the strength of the inner tube should meet the pressure-bearing requirements.

[0044] In the above embodiment, an LNG inlet 5 and an LNG inlet section exhaust pipe 6 are provided at the top of the forced mixing and dissolving chamber 10, and LNG is sequentially introduced into the forced mixing and dissolving chamber 10 and the microbubble generating chamber 9 through the LNG inlet 5, and the LNG inlet section exhaust pipe 6 is used for emergency exhaust. In this embodiment, the LNG inlet 5 is vertically arranged or arranged at 30° to 90° with the forced mixing and dissolving chamber 10. An LNG inlet section drain pipe 7 is provided at the bottom of the forced mixing and dissolving chamber 10 for emergency draining.

[0045] In the above embodiment, SK type spiral blades 14 and / or SX type dispersion structures 15 are arranged in the dispersion turbulent mixing chamber 16. SK type spiral blades 14 are arranged at both ends of the dispersion turbulent mixing chamber 16, and a plurality of SX type dispersion structures 15 are arranged in the middle of the dispersion turbulent mixing chamber 16.

[0046] The SK type spiral blade 14 is formed by welding conventional single-channel left spiral blades and right spiral blades, and is fixedly connected to the inner wall of the dispersed turbulent mixing chamber 16. The SX type dispersion structure 15 is an X-shaped steel sheet structure composed of cross-bars, and is fixedly connected to the inner wall of the dispersed turbulent mixing chamber 16.

[0047] In this embodiment, an LNG outlet section exhaust pipe 17 is provided at the top of the dispersed turbulent mixing chamber 16 for emergency exhaust; and an LNG outlet section drain pipe 18 is provided at the bottom of the dispersed turbulent mixing chamber 16 for emergency draining.

[0048] In the above embodiments, the material of each component is austenitic duplex stainless steel of grade 304, 304L, 316 or 316L.

[0049] In summary, the front partition 11 of the array tube bundle micro-honeycomb tube 8 of the present invention seals and isolates the evaporative gas inlet section 4 from the forced mixing and dissolution chamber 10, and the evaporative gas cannot enter the forced mixing and dissolution chamber 10 through the front partition 11; multiple array tube bundle micro-honeycomb tubes 8 form an array tube bundle through several circular array tube bundle support frames 13, and the space between the array tube bundle and the array tube bundle micro-honeycomb tubes 8 forms a microbubble generating chamber 9; the front end of the microbubble generating chamber 9 is sealed and isolated from the evaporative gas inlet section 4 by the front partition 11, and the rear end is incompletely isolated from the dispersed turbulent mixing chamber 16 by the rear partition 12; the outer space of the array tube bundle constitutes the forced mixing and dissolution chamber 10, and the microbubble generating chamber 9 is incompletely sealed and isolated from the forced mixing and dissolution chamber 10 and is in contact with it; the dispersed turbulent mixing chamber 16 is formed by multiple SK-type spiral sheets or SX-type dispersed structures.

[0050] In one embodiment of the present invention, a micro honeycomb array tube bundle composite LNG gas-liquid mixing method is provided, and the method is implemented based on the micro honeycomb array tube bundle composite LNG gas-liquid mixing device in the above embodiments. In this embodiment, the method includes the following steps:

[0051] 1) The evaporative gas enters from the evaporative gas inlet 1 and enters the array tube bundle micro honeycomb tube 8 through the evaporative gas inlet section 4;

[0052] 2) Due to the high pressure of the boil-off gas and the high flow rate, the boil-off gas is ejected from the honeycomb micropores 23 of the tube wall 22 of the array tube bundle micro-honeycomb tube, and the LNG entering from the top LNG inlet 5 quickly generates a large number of bubbles on the outside of the tube wall 22 of the array tube bundle micro-honeycomb tube. The bubbles are densely distributed in the array tube bundle area to form a micro-bubble generating cavity 9;

[0053] 3) In the microbubble generating chamber 9, a large number of bubbles are rapidly absorbed, collapsed and condensed into liquid LNG under the heat and mass transfer of supercooled LNG; a small number of bubbles that are not absorbed enter the forced mixing and dissolving chamber 10 outside the microbubble generating chamber 9, where a large amount of supercooled LNG exists and completes the absorption and phase change condensation of the remaining bubbles;

[0054] 4) LNG enters from the LNG inlet 5, and enters the forced mixing and dissolving chamber 10 and the microbubble generating chamber 9 in turn, and performs heat and mass transfer with the evaporated gas ejected from the array tube bundle micro honeycomb tube 8, completing the absorption and phase change condensation of the evaporated gas.

[0055] 5) After the evaporation gas is condensed in the microbubble generating chamber 9 and the forced mixing and dissolving chamber 10, it passes through the rear partition 12 and enters the dispersed turbulent mixing chamber 16 together with the LNG.

[0056] 6) In the dispersed turbulent mixing chamber 16, under the radial dispersed flow guiding action of the SK type spiral blades 14 and / or the SX type dispersed structure 15, further sufficient mixing and heat exchange are carried out, and after reaching a liquid rate of 100%, it flows through the LNG outlet section 19 and flows out through the LNG outlet 20.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A micro honeycomb array tube bundle composite LNG gas-liquid mixing device, characterized in that: include: An evaporation gas inlet section, through which the evaporation gas enters the interior of the device; The forced mixing and dissolving chamber is arranged at the rear of the evaporation gas inlet section, connected to the evaporation gas inlet section as a whole, and a front baffle is arranged between the two, and the evaporation gas inlet section and the forced mixing and dissolving chamber are sealed and isolated by the front baffle; The array tube bundle micro honeycomb tubes are arranged in a plurality and are evenly distributed in the forced mixing and dissolving chamber to form an array tube bundle area, and a micro bubble generating chamber is arranged in the array tube bundle area, and the front end of the micro bubble generating chamber is arranged on a front baffle; The dispersed turbulent mixing chamber is arranged at the rear of the forced mixing and dissolving chamber, connected to the forced mixing and dissolving chamber as a whole, and a rear partition is arranged between the forced mixing and dissolving chamber, and the forced mixing and dissolving chamber is incompletely isolated from the dispersed turbulent mixing chamber by the rear partition, and the rear end of the microbubble generating chamber is arranged on the rear partition; The LNG outlet section is arranged at the end of the dispersed turbulent mixing chamber to discharge the LNG after reaching 100% liquid rate.

2. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: The front end of the evaporation gas inlet section is provided with an evaporation gas inlet, and the top and bottom of the evaporation gas inlet section are respectively provided with an evaporation gas inlet section exhaust pipe and an evaporation gas inlet section liquid discharge pipe.

3. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: The array tube bundle micro honeycomb tube is fixed on the cavity wall inside the micro bubble generating cavity by welding through the array tube bundle support; The array tube bundle support adopts a circular structure; a plurality of array tube bundle micro honeycomb tubes are connected to form an array tube bundle through a plurality of circular array tube bundle supports, and the space outside the array tube bundle is a forced mixing and dissolving chamber; The microbubble generating chamber and the forced mixing and dissolving chamber are not completely sealed and isolated but are in contact with each other.

4. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: A plurality of regularly arranged honeycomb micropores are densely distributed on the tube wall of the micro honeycomb tube in the array tube bundle, and the honeycomb micropores evenly penetrate the tube wall of the micro honeycomb tube in the array tube bundle.

5. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: An LNG inlet and an LNG inlet section exhaust pipe are arranged at the top of the forced mixing and dissolving chamber; The LNG inlet and the forced mixing and dissolving chamber are arranged vertically or at an angle of 30° to 90°; An LNG inlet section discharge pipe is arranged at the bottom of the forced mixing and dissolving chamber 10 .

6. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: SK type spiral blades and / or SX type dispersion structures are arranged in the turbulent flow mixing chamber.

7. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 6, characterized in that: The SK type spiral blade is formed by welding conventional single-channel left spiral blades and right spiral blades, and is fixedly connected to the inner wall of the dispersed turbulent mixing chamber; The SX type dispersion structure adopts an X-shaped steel sheet structure composed of cross-bars and is fixedly connected to the inner wall of the dispersion turbulent mixing chamber.

8. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: An LNG outlet section exhaust pipe is arranged at the top of the dispersed turbulent mixing chamber; and an LNG outlet section liquid discharge pipe is arranged at the bottom of the dispersed turbulent mixing chamber.

9. The micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claim 1, characterized in that: All components of the device are made of austenitic duplex stainless steel of grades 304, 304L, 316 or 316L.

10. A micro honeycomb array tube bundle composite LNG gas-liquid mixing method, based on the micro honeycomb array tube bundle composite LNG gas-liquid mixing device as claimed in claims 1 to 9, characterized in that: include: The evaporative gas enters from the evaporative gas inlet and enters the micro honeycomb tubes of the array tube bundle through the evaporative gas inlet section; The evaporated gas is ejected from the honeycomb micropores on the wall of the micro-honeycomb tubes of the array tube bundle, and quickly generates a large number of bubbles on the outside of the wall of the micro-honeycomb tubes of the array tube bundle with the LNG entering from the top LNG inlet. The bubbles are densely distributed in the array tube bundle area to form a micro-bubble generating cavity; In the microbubble generating chamber, a large number of bubbles are rapidly absorbed, collapsed and condensed into liquid LNG under the heat and mass transfer of supercooled LNG; a small number of bubbles that are not absorbed enter the forced mixing and dissolution chamber outside the microbubble generating chamber, where a large amount of supercooled LNG exists and completes the absorption and phase change condensation of the remaining bubbles; LNG enters from the LNG inlet, and enters the forced mixing and dissolution chamber and the microbubble generating chamber in turn, and conducts heat and mass transfer with the evaporated gas ejected from the micro honeycomb tubes of the array tube bundle, completing the absorption and phase change condensation of the evaporated gas; After the evaporated gas is condensed in the microbubble generating chamber and the forced mixing and dissolving chamber, it passes through the rear baffle and enters the dispersed turbulent mixing chamber together with the LNG. In the dispersed turbulent mixing chamber, under the radial dispersed flow guidance of the SK type spiral blades and / or the SX type dispersed structure, further sufficient mixing and heat exchange are carried out, and after reaching 100% liquid rate, the liquid flows through the LNG outlet section and flows out through the LNG outlet.

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