Ultrasonic vaporizer for LNG, LNG vaporization system and vaporization method

Abstract

The present invention discloses an ultrasonic gasifier for LNG and an LNG gasification system, which belongs to the technical field of ship liquefied gas storage and gasification, and comprises a gasification part, which is provided with a gasification channel, and the gasification channel comprises a feed end and a discharge end; a heat exchange part, which is arranged around the periphery of the gasification part; a first ultrasonic generator, which is connected to one side of the feed end of the gasification part; the feed end comprises a first air inlet end and a second air inlet end, the first air inlet end is configured for the input of liquefied natural gas, and the second air inlet end is configured for the input of gaseous natural gas. The present invention also discloses an LNG gasification method. The ultrasonic gasifier for LNG, the gasification system and the gasification method of the present invention realize the efficient gasification of liquefied natural gas through the oscillation and cavitation of ultrasonic waves and the heat transfer and energy supply of the heat exchange part. The ultrasonic gasifier can greatly reduce the overall size of the gasifier, and realize the gasification of liquefied natural gas in a limited space.

Description

Technical Field

[0001] The invention belongs to the technical field of ship liquefied gas storage and gasification, and in particular relates to an ultrasonic gasifier for LNG and an LNG gasification system. Background Art

[0002] LNG (liquefied natural gas) is obtained by cooling gaseous natural gas to about -162°C under normal pressure to condense it into liquid. Its main components are methane, a small amount of ethane, propane, nitrogen and other impurities. LNG itself has a high combustion efficiency, produces fewer pollutants after combustion, and is relatively safe, making it an ideal clean energy source.

[0003] In addition to its own usage characteristics, LNG has certain advantages in storage and transportation. LNG is usually transported by low-temperature tank trucks or ships to achieve long-distance and cross-regional transportation. Since LNG is compressed from gaseous natural gas, it has a high energy density. When used, LNG needs to be converted into gaseous natural gas before it can be transported to the user end for use. In conventional land use, since it is not restricted by the site, LNG can be heated and gasified using a vaporizer pipeline of up to ten meters to complete the LNG gasification work. However, in the offshore field, due to the limitations of LNG ships, the space reserved for LNG gasification equipment on board is limited, resulting in the inability to fully gasify LNG. Therefore, existing gasification equipment often cannot meet the gasification work of ship LNG. Summary of the invention

[0004] In view of one or more of the above defects or improvement needs of the prior art, the present invention provides an ultrasonic vaporizer for LNG, which is used to solve the problem that the existing LNG gasification equipment cannot meet the requirements of offshore gasification.

[0005] To achieve the above object, the present invention provides an ultrasonic vaporizer for LNG, comprising:

[0006] A gasification section, wherein the gasification section is provided with a gasification channel, one end of the gasification channel is provided with a feed end, and the other end of the gasification channel is provided with a discharge end;

[0007] a heat exchange portion, the heat exchange portion being disposed around the periphery of the gasification portion and being used to heat the gasification channel; and

[0008] A first ultrasonic generator, wherein the first ultrasonic generator is connected to one side of the feed end;

[0009] The feed end includes a first air inlet end and a second air inlet end, the first air inlet end is configured for inputting liquid natural gas, and the second air inlet end is configured for inputting gaseous natural gas, and the natural gas inputted through the first air inlet end and the second air inlet end is mixed at the feed end and cavitated by the first ultrasonic generator.

[0010] In certain embodiments, the feed end further includes a nozzle having a containing space therein, and the containing space is open toward one side of the discharge end, and the first air inlet end and the second air inlet end are respectively connected to the containing space.

[0011] In certain embodiments, the gasification channel is filled with a wire mesh component, the wire mesh component is a porous structure, and the wire mesh component is extended along a first direction, and the first direction is an extension direction from the feed end to the discharge end.

[0012] In certain embodiments, the wire mesh component is a wire mesh packing.

[0013] In some embodiments, the heat exchange part includes a shell, and the shell and the outer periphery of the gasification part form a heat exchange channel. The heat exchange channel is provided with a medium input port and a medium output port at both ends along a first direction, and the first direction is the extension direction from the feed end to the discharge end.

[0014] In certain embodiments, a plurality of baffles are arranged in the heat exchange channel at intervals along a first direction, and the plurality of baffles partially block the heat exchange channel along the first direction.

[0015] According to another aspect of the present invention, there is also provided an LNG gasification system, comprising:

[0016] A feed chamber, wherein the feed chamber is used to store liquid natural gas;

[0017] A gas delivery cavity, the gas delivery cavity is used to output or store gaseous natural gas;

[0018] The ultrasonic gasifier for LNG is arranged between the feed cavity and the gas delivery cavity.

[0019] In certain embodiments, a multi-stage gasification assembly is provided between the feed cavity and the gas delivery cavity, the gasification assemblies at each stage are connected in series, and the gasification assemblies at each stage include at least one ultrasonic gasifier for LNG.

[0020] In certain embodiments, the gas delivery cavity is connected to the second gas inlet end of the LNG ultrasonic vaporizer.

[0021] In certain embodiments, a multi-stage gasification assembly is provided between the feed cavity and the gas delivery cavity, the gasification assemblies at each stage are connected in series, and the gasification assemblies at each stage include at least one ultrasonic gasifier for LNG.

[0022] In certain embodiments, at least some of the gasification components include two ultrasonic gasifiers for LNG arranged in parallel, and the discharge end of the ultrasonic gasifier for LNG of the upper-level gasification component is connected to the first air inlet end of the ultrasonic gasifier for LNG of the lower-level gasification component.

[0023] In certain embodiments, the multi-stage gasification assembly includes a primary gasification assembly, a secondary gasification assembly, and a tertiary gasification assembly; wherein,

[0024] The first-stage gasification assembly and the second-stage gasification assembly each include two ultrasonic gasifiers for LNG arranged in parallel;

[0025] The three-stage gasification assembly includes an ultrasonic gasifier for LNG.

[0026] In some embodiments, it further includes a medium supply end and a medium recovery end, wherein the medium supply end is configured to supply a heating medium, and the medium recovery end is configured to recover the heating medium;

[0027] The plurality of medium input ports are connected to the medium supply end through a first pipeline, and the plurality of medium output ports are connected to the medium recovery end through a second pipeline.

[0028] In some embodiments, the gas delivery cavity is further connected to a buffer tank at one end facing the multi-stage gasification assembly;

[0029] A second ultrasonic generator is arranged in the buffer tank, and a demister is also arranged in the buffer tank.

[0030] According to another aspect of the present invention, there is also provided a method for gasifying LNG, which comprises the following steps:

[0031] S1. Setting a storage space, inputting liquid natural gas and gaseous natural gas into the storage space according to a set ratio for mixing;

[0032] S2, performing ultrasonic cavitation on the mixed natural gas in the accommodation space;

[0033] S3. Heating the mixed natural gas to achieve conversion of liquid natural gas into gaseous natural gas.

[0034] In certain embodiments, in step S3, the mixed natural gas is heated along the conveying direction, and a wire mesh filler is arranged on the conveying path of the mixed natural gas.

[0035] In certain embodiments, in step S3, the cavitated mixed natural gas is transported via a pipeline, and the cavitated mixed natural gas is heated via an ethylene glycol solution at the periphery of the pipeline.

[0036] In certain embodiments, further comprising:

[0037] S4, transporting the heated mixed natural gas to another accommodating space, inputting a set proportion of gaseous natural gas into the accommodating space, and going to steps S2 and S3;

[0038] S5. Obtain the gas ratio in the mixed natural gas. When the gas ratio in the mixed natural gas is ≤99%, repeat step S4 until the gas ratio in the mixed natural gas is greater than 99%. When the gas ratio in the mixed natural gas is greater than 99%, the gasification of the liquefied natural gas is completed.

[0039] In certain embodiments, in step S1, the mixing ratio of liquid natural gas to gaseous natural gas is 1:1.5-3.

[0040] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0041] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0042] The ultrasonic gasifier for LNG of the present invention uses a first ultrasonic generator to cavitate the liquefied natural gas, so that the liquefied natural gas can be quickly formed into tiny liquid droplets, increasing the specific surface area of ​​the liquefied natural gas, making it easier for the liquefied natural gas to absorb the heat transferred by the heat exchange part, and quickly forming it into gaseous natural gas, thereby realizing efficient gasification of the liquefied natural gas. At the same time, the present invention adopts a method of mixing liquefied natural gas with gaseous natural gas to form a multiphase mixed state, thereby avoiding the severe cavitation of the highly compressed liquefied natural gas and ensuring the stable gasification of the liquefied natural gas. The ultrasonic gasifier for LNG of the present invention directly converts electrical energy into molecular motion kinetic energy through ultrasonic oscillation and cavitation, and realizes efficient gasification of the liquefied natural gas through heat transfer energy supply through the heat exchange part, and the ultrasonic gasifier can overall reduce the problem of the traditional gasification method requiring sufficient heat exchange area, which can greatly reduce the overall size of the gasifier and realize the gasification of the liquefied natural gas in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1 Schematic diagram of the overall structure of an ultrasonic vaporizer for LNG in an embodiment of the present invention;

[0045] Figure 2is a schematic diagram of the overall structure of the LNG gasification system in an embodiment of the present invention;

[0046] Figure 3 is a schematic flow diagram of one of the LNG gasification methods in the embodiments of the present invention;

[0047] Figure 4 It is a schematic flow diagram of one of the LNG gasification methods in the embodiments of the present invention.

[0048] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0049] 100. Ultrasonic vaporizer for LNG; 200. Feed chamber; 300. Gas delivery chamber; 400. Primary vaporization assembly; 500. Secondary vaporization assembly; 600. Thirdary vaporization assembly; 700. Medium supply end; 800. Medium recovery end; 900. First pipeline; 1000. Second pipeline; 1100. Third pipeline; 1200. Buffer tank; 1300. Pressure regulating valve; 1400. Booster pump; 1500. Ultrasonic power supply;

[0050] 1201, a second ultrasonic generator; 1202, a demister;

[0051] 110, gasification part; 111, gasification channel; 112, first air inlet end; 113, second air inlet end; 114, discharge end;

[0052] 120, heat exchange part; 121, heat exchange channel; 122, baffle; 123, medium input port; 124, medium output port;

[0053] 130. A first ultrasonic generator;

[0054] 140. Connecting flange;

[0055] 150, nozzle;

[0056] 160. Screen assembly. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] In the description of the present invention, it should be understood that, unless otherwise specified, terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 limiting the present invention.

[0059] In addition, unless otherwise specified, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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 the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0062] See also Figures 1 to 4The ultrasonic vaporizer 100 for LNG in the preferred embodiment of the present invention includes a vaporization part 110, the vaporization part 110 is provided with a vaporization channel 111, a feed end is provided at one end of the vaporization channel 111, and a discharge end 114 is provided at the other end of the vaporization channel 111; and a heat exchange part 120, the heat exchange part 120 is arranged around the periphery of the vaporization part 110, and is used to heat the vaporization channel 111; a first ultrasonic generator 130, the first ultrasonic generator 130 is connected to one side of the feed end of the vaporization part 110; at the same time, the feed end includes a first gas inlet end 112 and a second gas inlet end 113, the first gas inlet end 112 is configured to input liquefied natural gas, and the natural gas input from the first gas inlet end 112 and the second gas inlet end 113 is mixed at the feed end and finally cavitated by the first ultrasonic generator 130.

[0063] The ultrasonic gasifier 100 for LNG of the present invention uses the first ultrasonic generator 130 to cavitate the liquefied natural gas, so that the liquefied natural gas can be quickly formed into tiny liquid droplets, increasing the specific surface area of ​​the liquefied natural gas, facilitating the liquefied natural gas to absorb the heat transferred by the heat exchange part 120, and quickly forming into gaseous natural gas, thereby realizing efficient gasification of the liquefied natural gas. At the same time, the present invention adopts a method of mixing liquefied natural gas with gaseous natural gas to form a multiphase mixed state, avoiding the severe cavitation of highly compressed liquefied natural gas, and ensuring the stable gasification of the liquefied natural gas. The ultrasonic gasifier 100 for LNG of the present invention directly converts electrical energy into molecular motion kinetic energy through ultrasonic oscillation and cavitation, and realizes efficient gasification of the liquefied natural gas through heat transfer energy supply through the heat exchange part 120. The ultrasonic gasifier can overall reduce the problem that the traditional gasification method requires sufficient heat exchange area, can greatly reduce the overall size of the gasifier, and realize the gasification of liquefied natural gas in a limited space.

[0064] Specifically, the ultrasonic gasifier 100 for LNG of the present invention realizes efficient gasification of liquefied natural gas in a limited space by using the first ultrasonic generator 130 to perform ultrasonic vibration on liquefied natural gas, and heating with the aid of the heat exchange part 120; at the same time, by using the first gas inlet end 112 and the second gas inlet end 113 to input liquefied and gaseous natural gas, the proportion of liquefied natural gas at the action point of the first ultrasonic generator 130 is reduced by using gaseous natural gas, and the ultrasonic vibration is ensured to be suitable for liquefaction of LNG in the form of diluting the proportion of liquefied natural gas, thereby solving the potential safety hazard caused by the high-speed expansion of liquefied natural gas under ultrasonic oscillation in a small space. The present application completes the efficient and stable gasification of liquefied natural gas at -162°C and compressed 600 to 625 times in a small space through the combined structure of the first ultrasonic generator 130, the heat exchange part 120, the first gas inlet end 112 and the second gas inlet end 113, thereby solving the problem that the ultrasonic gasification device cannot be applied to LNG gasification and the existing LNG gasification device occupies a large space.

[0065] As an optional embodiment of the present invention, the feed end in the present invention further includes a nozzle 150, which is connected to the first ultrasonic generator 130 and is disposed in the gasification channel 111. The nozzle 150 has a containing space, and the containing space is provided with an opening on one side facing the discharge end 114. The first gas inlet end 112 and the second gas inlet end 113 are respectively connected to the nozzle 150. The nozzle 150 in the present invention serves as a mixing space for liquefied natural gas and gaseous natural gas and an action carrier of the first ultrasonic generator 130, facilitating the mixing of liquefied natural gas and gaseous natural gas and receiving the energy transmitted by the first ultrasonic generator 130, thereby realizing efficient cavitation of liquefied natural gas.

[0066] As an optional embodiment of the present invention, the gasification part 110 in the present invention is a long cylindrical structure, in which a gasification channel 111 is formed in the middle, one end of the gasification part 110 is connected to the first ultrasonic generator 130, and the other end is provided with a discharge end 114. The first ultrasonic generator 130 is installed at the end of the gasification part 110 through a connecting flange 140, and a nozzle 150 is provided at one end of the connecting flange 140 away from the first ultrasonic generator 130, and the two sides of the nozzle 150 are respectively connected to the first air inlet end 112 and the second air inlet end 113. Optionally, the gasification part 110 in the present invention can be a structure with an internal space such as a circular cylinder, a square cylinder, etc. The gasification part 110 is preferably a circular cylinder to increase the contact area with the heat exchange part 120.

[0067] As an optional embodiment of the present invention, the gasification channel 111 in the present invention is filled with a wire mesh component 160, which is a porous structure, and the wire mesh component 160 is arranged to extend along the first direction. The wire mesh component 160 with a porous structure blocks the liquefied natural gas in the gasification channel 111, thereby increasing the retention time of the liquefied natural gas in the gasification channel 111, so as to increase the contact time with the heat exchange part 120 and improve the gasification efficiency. At the same time, the wire mesh component 160 is a solid structure, which has a higher energy transfer efficiency than air. When the surface of the wire mesh component 160 retains the liquefied natural gas, the ultrasonic wave generated by the first ultrasonic generator 130 can be transmitted through the wire mesh component 160, and the secondary cavitation of the liquefied natural gas in the gasification channel 111 is realized, further increasing the cavitation efficiency of the natural gas. At the same time, through the secondary transmission of the wire mesh component 160, the problem of the highly compressed liquefied natural gas releasing energy instantly when it contacts the first ultrasonic generator 130 is avoided, ensuring the safety and stability of the natural gas gasification.

[0068] Optionally, the wire mesh component 160 in the present invention can be a porous structure such as a wire mesh filler or foam metal, and both the wire mesh filler and the foam metal have good heat transfer and ultrasonic transmission effects. Preferably, the wire mesh component 160 in the present invention is a wire mesh filler, which is usually made of a metal wire mesh or a plastic wire mesh, and has the advantages of a large specific surface area, a high porosity, and sufficient gas-liquid contact, and can be used as an attachment for liquid natural gas and facilitate the circulation of gaseous natural gas.

[0069] Optionally, the wire mesh assembly 160 in the present invention is connected to the inner wall of the gasification section 110 at both ends along the first direction, and the ultrasonic wave generated by the first ultrasonic generator 130 can be transmitted to the wire mesh assembly 160 through the gasification section 110, and the liquid natural gas attached to its surface can be vibrated through the wire mesh assembly 160 to achieve secondary cavitation of the liquid natural gas.

[0070] Optionally, the first direction in the present invention is the arrangement direction of the ultrasonic vaporizer 100 for LNG, that is, the setting direction of the vaporization channel 111. It is worth noting that the first gas inlet end 112 in the present application refers to the inlet port of liquefied natural gas, which does not mean that the substance entering the first gas inlet end 112 must be gas, which can be liquefied natural gas, liquid-gas mixed natural gas or gaseous natural gas.

[0071] Optionally, the heat exchange part 120 in the present invention can be partially wrapped around the periphery of the gasification part 110, such as being wrapped around the periphery of the gasification part 110 at intervals along the first direction, or being wrapped around the periphery of the gasification part 110 in a spiral winding form, or forming a cylindrical structure cover arranged around the periphery of the gasification part 110 to achieve heat transfer to the gasification part 110. The heat exchange part 120 in the present invention can be a heating device with heat generation capability, or can be used as a heating carrier to introduce an external heat source into the heat exchange part 120 to heat the gasification part 110.

[0072] As an optional embodiment of the present invention, the heat exchange part 120 in the present invention includes a shell, and the shell and the outer periphery of the gasification part 110 form a heat exchange channel 121. The heat exchange channel 121 is respectively provided with a medium input port 123 and a medium output port 124 at both ends along the first direction. A plurality of baffles 122 are arranged in the heat exchange channel 121 at intervals along the first direction, and the plurality of baffles 122 at least partially block the heat exchange channel 121 along the first direction. The heating medium is transported to the heat exchange channel 121 through the medium input port 123, and the heating medium transfers heat to the gasification channel 111 through the outer wall of the gasification part 110 to achieve heating of the natural gas and facilitate gasification of the natural gas. The arrangement of the medium input port 123 and the medium output port 124 can achieve rapid replacement of the heating medium and the natural gas after heat exchange, thereby ensuring the gasification efficiency of the natural gas. The baffles 122 form a barrier in the first direction to slow down the flow rate of the heating medium in the gasification channel 111, increase the contact time with the natural gas, and improve the heat exchange efficiency.

[0073] Optionally, the baffle 122 is a flat plate structure or a curved surface structure, and the baffle 122 is arranged in the heat exchange channel 121 perpendicularly to the first direction or obliquely, and the cross-sectional area of ​​the baffle 122 is smaller than the cross-sectional area between the heat exchange channel 121 and the gasification channel 111, so that the heating medium can flow from the medium input port 123 through the medium output port 124 to heat the natural gas. Optionally, the baffle 122 can also close the cross-section between the heat exchange channel 121 and the gasification channel 111, and open a plurality of flow channels on the baffle 122 for the heating medium to flow.

[0074] Optionally, the medium input port 123 in the present application is set at one end close to the feed end, the medium output port 124 is set at one end close to the discharge end 114, and the heating medium and the natural gas are transmitted in the same direction. In the actual setting process, the heating medium and the natural gas can also be transmitted in the opposite direction, that is, the medium input port 123 is set at one end close to the discharge end 114, and the medium output port 124 is set at one end close to the feed end.

[0075] As another optional embodiment of the present invention, the baffle 122 in the present invention divides the heat exchange channel 121 into a spiral channel, and the medium input port 123 and the medium output port 124 are respectively connected to the two ends of the spiral channel, so as to increase the contact distance between the heating medium and the outer wall of the vaporization part 110 and improve the heat exchange efficiency.

[0076] Optionally, the medium flowing in the heat exchange part 120 in the present invention is water or ethylene glycol solution. Preferably, ethylene glycol solution is used. Ethylene glycol has a higher boiling point and is not easy to boil and vaporize at a higher temperature, and can carry more heat energy in a liquid state, thereby achieving stable heat transfer to natural gas.

[0077] As an optional embodiment of the present invention, Figure 2As shown, the present invention also includes an LNG gasification system, which includes a feed chamber 200 and a gas delivery chamber 300, wherein the feed chamber 200 is used to store liquid natural gas, and the gas delivery chamber 300 is used to output or store gaseous natural gas for use by the user end, and the above-mentioned ultrasonic gasifier 100 for LNG is arranged between the feed chamber 200 and the gas delivery chamber 300. The LNG gasification system of the present invention realizes efficient gasification of natural gas by arranging the ultrasonic gasifier 100 for LNG between the feed chamber 200 and the gas delivery chamber 300, realizes natural gas gasification work in a limited space, and facilitates the daily use of natural gas.

[0078] Optionally, a multi-stage gasification assembly is provided between the feed chamber 200 and the gas delivery chamber 300, and each stage of the gasification assembly is connected in series, and each stage of the gasification assembly includes at least one ultrasonic gasifier 100 for LNG. In addition to using the ultrasonic gasifier 100 for LNG to achieve primary gasification, the present invention can also be provided with a multi-stage gasification assembly, and the natural gas output by the ultrasonic gasifier 100 for LNG is transmitted to another ultrasonic gasifier 100 for LNG for secondary gasification, so as to perform gasification step by step to ensure that the final natural gas meets the direct use of the gas delivery chamber 300. At the same time, the gasification assembly at each stage may include one ultrasonic gasifier 100 for LNG, or may include multiple ultrasonic gasifiers 100 for LNG. When the gasification assembly at each stage uses multiple ultrasonic gasifiers 100 for LNG, the gasification efficiency of the liquefied natural gas can be improved, and the supply of the gaseous natural gas can be increased. Optionally, in actual use, the opening and closing states of the ultrasonic gasifiers 100 for LNG in the gasification assembly at each stage can be adjusted according to the natural gas demand of the gas delivery chamber 300 to ensure a stable supply of natural gas.

[0079] As an optional embodiment of the present invention, at least part of the gasification components in the present invention include two ultrasonic gasifiers 100 for LNG arranged in parallel, and the discharge end 114 of the ultrasonic gasifier 100 for LNG of the upper-stage gasification component is connected to the first air inlet end 112 of the ultrasonic gasifier 100 for LNG of the lower-stage gasification component.

[0080] Optionally, the multi-stage gasification assembly in the present application includes a primary gasification assembly 400, a secondary gasification assembly 500 and a tertiary gasification assembly 600; wherein the primary gasification assembly 400 is connected to the feed chamber 200, and the primary gasification assembly 400 includes two ultrasonic gasifiers 100 for LNG arranged in parallel; the secondary gasification assembly 500 also includes two ultrasonic gasifiers 100 for LNG arranged in parallel, and the discharge ends 114 of the two ultrasonic gasifiers 100 for LNG of the primary gasification assembly 400 are connected to the feed ends of the two ultrasonic gasifiers 100 for LNG of the secondary gasification assembly 500 through a pipeline; the tertiary gasification assembly 600 includes an ultrasonic gasifier 100 for LNG, and the discharge ends 114 of the two ultrasonic gasifiers 100 for LNG of the secondary gasification assembly 500 are connected to the feed end of the ultrasonic gasifier 100 for LNG of the tertiary gasification assembly 600 through a pipeline. By arranging the three-stage gasification assembly 600 and the ultrasonic gasifier 100 for LNG in parallel, the supply of natural gas can be increased, while preventing the natural gas output from the gas transmission cavity 300 from containing liquefied natural gas, thereby ensuring the stable use of the natural gas in the gas transmission cavity 300.

[0081] Optionally, in addition to the above-mentioned three-stage gasification assembly 600, other multi-stage forms such as two-stage, four-stage, etc. can also be set according to actual use requirements; and one or more LNG ultrasonic gasifiers 100 can be set in each gasification assembly according to requirements.

[0082] As an optional embodiment of the present invention, the LNG gasification system of the present invention further includes a medium supply end 700 and a medium recovery end 800. The medium supply end 700 is used to supply a heating medium to transfer heat to the natural gas in the gasification section 110 to achieve gasification of liquefied natural gas; the medium recovery end 800 is used to recover the heating medium after heat transfer to achieve recycling of the heating medium, ensure efficient heating of the gasification section 110 by the heating medium, and achieve stable gasification of liquefied natural gas. At the same time, the medium input ports 123 of the plurality of LNG ultrasonic gasifiers 100 are all connected to the medium supply end 700 through the first pipeline 900, and the plurality of medium output ports 124 are all connected to the medium recovery end 800 through the second pipeline 1000. Through the connection arrangement of the first pipeline 900 and the second pipeline 1000, the stable supply and recovery of the heating medium in the LNG gasification system is achieved.

[0083] As an optional embodiment of the present invention, the gas delivery cavity 300 in the present application is connected to the second gas inlet end 113 of the ultrasonic gasifier 100 for LNG of each gasification assembly. Liquid natural gas will be violently cavitated under the ultrasonic action of the first ultrasonic generator 130, so it is necessary to transfer the natural gas part that is completely gasified at the gas delivery cavity 300 back to the second gas inlet end 113 to reduce the cavitation degree of the liquid natural gas. Optionally, the gas delivery cavity 300 can be connected to each second gas inlet end 113 through a third pipeline 1100, or a branch pipe can be set between the gas delivery cavity 300 and the discharge end 114 of the ultrasonic gasifier 100 for LNG of the last gasification assembly 400, and connected to each second gas inlet end 113 through the branch pipe.

[0084] Optionally, a booster pump 1400 is further provided on the third pipeline 1100. The natural gas supplied to each second gas inlet end 113 belongs to the part diverted from the gas transmission cavity 300. The booster pump 1400 is provided on the third pipeline 1100 to increase the transmission pressure of the natural gas diverted from the output end to ensure the mixing ratio of liquid natural gas and gaseous natural gas in the ultrasonic gasifier 100 for LNG.

[0085] As an optional embodiment of the present invention, a buffer tank 1200 is further provided at one end of the gas delivery cavity 300 facing the multi-stage gasification assembly in the present application, and a second ultrasonic generator 1201 is provided in the buffer tank 1200, and a demister 1202 is also provided in the buffer tank 1200. The buffer tank 1200 is arranged between the gas delivery cavity 300 and the gasification assembly, and is used to remove the residual liquefied natural gas in the natural gas transmitted from the multi-stage gasification assembly. The buffer tank 1200 is designed as a redundancy to prevent the natural gas output from the gas delivery cavity 300 from containing liquefied natural gas.

[0086] As an optional embodiment of the present invention, in the present application, a pressure-stabilizing valve 1300 is further provided between the buffer tank 1200 and the gas transmission cavity 300. The pressure-stabilizing valve 1300 is used to stabilize the transmission rate of natural gas and realize a stable supply of natural gas.

[0087] Optionally, a pressure regulating valve is provided between the multi-stage gasification assembly and the buffer tank 1200, which is mainly used to balance the internal pressure of the LNG system caused by changes in the input amount of liquid natural gas in the feed chamber 200, so as to avoid overpressure or underpressure caused by different natural gas demands in the gas transmission chamber 300.

[0088] Optionally, the plurality of first ultrasonic generators 130 and second ultrasonic generators 1201 in the present application are all connected to the ultrasonic power supply 1500 through lines to achieve stable operation of the first ultrasonic generators 130 and the second ultrasonic generators 1201 .

[0089] As another optional embodiment of the present invention, the present application also includes a LNG gasification method, which includes the following steps:

[0090] S1. Setting a storage space, inputting liquid natural gas and gaseous natural gas into the storage space according to a set ratio for mixing;

[0091] S2, performing ultrasonic cavitation on the mixed natural gas in the accommodation space;

[0092] S3. Heating the mixed natural gas to achieve conversion of liquid natural gas into gaseous natural gas.

[0093] The LNG gasification method of the present invention adopts ultrasonic cavitation to achieve rapid cavitation of liquefied natural gas. At the same time, gaseous natural gas is mixed with liquefied natural gas to control the cavitation degree of liquefied natural gas under the action of ultrasonic waves, so that liquefied natural gas can be cavitated under ultrasonic waves. The cavitated natural gas can quickly absorb heat to achieve efficient gasification.

[0094] As an optional embodiment of the present invention, in step S3, the mixed natural gas is heated along the conveying direction, and a wire mesh filler is arranged on the conveying path of the mixed natural gas.

[0095] As an optional embodiment of the present invention, in step S3, the cavitated mixed natural gas is transported by a pipeline, and the cavitated mixed natural gas is heated by an ethylene glycol solution at the periphery of the pipeline.

[0096] As an optional embodiment of the present invention, the LNG gasification method further includes:

[0097] S4, transporting the heated mixed natural gas to another accommodating space, inputting a set proportion of gaseous natural gas into the accommodating space, and going to steps S2 and S3;

[0098] S5. Obtain the gas ratio in the mixed natural gas. When the gas ratio in the mixed natural gas is ≤99%, repeat step S4 until the gas ratio in the mixed natural gas is greater than 99%. When the gas ratio in the mixed natural gas is greater than 99%, the gasification of the liquefied natural gas is completed.

[0099] In addition to using ultrasonic primary cavitation to form gaseous natural gas, the present invention can also use a step-by-step gasification method to achieve gasification of liquefied natural gas through a multi-stage LNG ultrasonic gasifier 100.

[0100] As an optional embodiment of the present invention, in step S1, the ratio of liquefied natural gas to gaseous natural gas is 1:1.5 to 3. Optionally, when the gasification assembly is multi-stage, the ratio of liquefied natural gas to gaseous natural gas in different stages of gasification assemblies is different, and the ratio of gaseous natural gas input into the second gas inlet 113 can be adjusted according to actual gasification requirements.

[0101] As an optional embodiment of the present invention, when the LNG gasification system includes three-stage gasification components, and the first-stage gasification component 400 includes two ultrasonic gasifiers 100 for LNG, the second-stage gasification component 500 includes two ultrasonic gasifiers 100 for LNG, and the third-stage gasification component 600 includes one ultrasonic gasifier 100 for LNG. The ratio of liquid natural gas to gaseous natural gas inputted from the first gas inlet end 112 and the second gas inlet end 113 in the first-stage gasification component 400 is 1:2; the ratio of mixed natural gas to gaseous natural gas inputted from the first gas inlet end 112 and the second gas inlet end 113 in the second-stage gasification component 500 is 95%:5%; the ratio of mixed natural gas to gaseous natural gas inputted from the first gas inlet end 112 and the second gas inlet end 113 in the third-stage gasification component 600 is 98%:2%. In this way, the gasification of liquefied natural gas is achieved through multi-stage gasification.

[0102] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic vaporizer for LNG, characterized in that: include: A gasification section, wherein the gasification section is provided with a gasification channel, one end of the gasification channel is provided with a feed end, and the other end of the gasification channel is provided with a discharge end; a heat exchange portion, the heat exchange portion being disposed around the periphery of the gasification portion and being used to heat the gasification channel; and A first ultrasonic generator, wherein the first ultrasonic generator is connected to one side of the feed end; The feed end includes a first gas inlet end and a second gas inlet end, the first gas inlet end is configured for inputting liquid natural gas, and the second gas inlet end is configured for inputting gaseous natural gas, and the natural gas inputted through the first gas inlet end and the second gas inlet end is mixed at the feed end and cavitated by the first ultrasonic generator; The feed end further comprises a nozzle, wherein a containing space is provided in the nozzle, and the containing space is open toward one side of the discharge end, and the first air inlet end and the second air inlet end are respectively connected to the containing space.

2. The ultrasonic vaporizer for LNG according to claim 1, characterized in that: The gasification channel is filled with a wire mesh component, the wire mesh component is a porous structure, and the wire mesh component is extended along a first direction, and the first direction is the extension direction from the feed end to the discharge end.

3. The ultrasonic vaporizer for LNG according to claim 2, characterized in that: The wire mesh component is a wire mesh filler.

4. The ultrasonic vaporizer for LNG according to claim 1, characterized in that: The heat exchange part includes a shell, and the shell and the periphery of the gasification part form a heat exchange channel. The heat exchange channel is provided with a medium input port and a medium output port at both ends along a first direction, and the first direction is the extension direction from the feed end to the discharge end.

5. The ultrasonic vaporizer for LNG according to claim 4, characterized in that: A plurality of baffles are arranged in the heat exchange channel at intervals along a first direction, and the plurality of baffles partially block the heat exchange channel along the first direction.

6. An LNG gasification system, characterized in that: include: A feed chamber, wherein the feed chamber is used to store liquid natural gas; A gas delivery cavity, the gas delivery cavity is used to output or store gaseous natural gas; An ultrasonic gasifier for LNG as claimed in any one of claims 1 to 5 is arranged between the feed cavity and the gas delivery cavity.

7. The LNG gasification system according to claim 6, characterized in that: The gas delivery cavity is connected to the second gas inlet end of the LNG ultrasonic vaporizer.

8. The LNG gasification system according to claim 6, characterized in that: A multi-stage gasification assembly is provided between the feed cavity and the gas delivery cavity. The gasification assemblies at each stage are connected in series with each other, and each stage of the gasification assembly includes at least one ultrasonic gasifier for LNG.

9. The LNG gasification system according to claim 8, characterized in that: At least part of the gasification components include two parallel-connected ultrasonic gasifiers for LNG, and the discharge end of the ultrasonic gasifier for LNG of the upper-stage gasification component is connected to the first air inlet end of the ultrasonic gasifier for LNG of the lower-stage gasification component.

10. The LNG gasification system according to claim 9, characterized in that: The multi-stage gasification assembly includes a primary gasification assembly, a secondary gasification assembly and a tertiary gasification assembly; wherein, The first-stage gasification assembly and the second-stage gasification assembly each include two ultrasonic gasifiers for LNG arranged in parallel; The three-stage gasification assembly includes an ultrasonic gasifier for LNG.

11. The LNG gasification system according to claim 8, characterized in that: It also includes a medium supply end and a medium recovery end, wherein the medium supply end is configured to supply a heating medium, and the medium recovery end is configured to recover the heating medium; The heat exchange channel of each LNG ultrasonic vaporizer is provided with a medium input port and a medium output port at both ends along the first direction, and multiple medium input ports are connected to the medium supply end through a first pipeline, and multiple medium output ports are connected to the medium recovery end through a second pipeline.

12. The LNG gasification system according to claim 8, characterized in that: The gas delivery cavity is also connected to a buffer tank at one end facing the multi-stage gasification assembly; A second ultrasonic generator is arranged in the buffer tank, and a demister is also arranged in the buffer tank.

13. A method for gasifying LNG, comprising gasifying LNG by using the LNG gasification system according to any one of claims 7 to 12, characterized in that: The steps include: S1. Setting a storage space, inputting liquid natural gas and gaseous natural gas into the storage space according to a set ratio for mixing; S2, performing ultrasonic cavitation on the mixed natural gas in the accommodation space; S3. Heating the mixed natural gas to achieve conversion of liquid natural gas into gaseous natural gas.

14. The LNG gasification method according to claim 13, characterized in that: In step S3, the mixed natural gas is heated along the conveying direction, and a wire mesh filler is arranged on the conveying path of the mixed natural gas.

15. The LNG gasification method according to claim 13, characterized in that: In step S3, the cavitated mixed natural gas is transported through a pipeline, and the cavitated mixed natural gas is heated by using an ethylene glycol solution at the periphery of the pipeline.

16. The LNG gasification method according to claim 13, characterized in that: Also includes: S4, transporting the heated mixed natural gas to another accommodating space, inputting a set proportion of gaseous natural gas into the accommodating space, and going to steps S2 and S3; S5. Obtain the gas ratio in the mixed natural gas in S3. When the gas ratio in the mixed natural gas is ≤99%, repeat step S4 until the gas ratio in the mixed natural gas is greater than 99%. When the gas ratio in the mixed natural gas is greater than 99%, the gasification of the liquefied natural gas is completed.

17. The LNG gasification method according to claim 13, characterized in that: In the step S1, the mixing ratio of the liquid natural gas to the gaseous natural gas is 1:1.5-3.

Images