Liquefied natural gas gasification system with air as heat source

Abstract

The embodiment of the utility model provides a liquefied natural gas gasification system taking air as a heat source, and the system comprises a liquefied natural gas system which comprises an LNG gasifier, the cold fluid side inlet of the LNG gasifier is connected with a liquefied natural gas input pipeline, and the cold fluid side outlet of the LNG gasifier is connected with a natural gas output pipeline; the intermediate medium system is connected with the LNG gasifier and used for providing an intermediate medium for the hot fluid side of the LNG gasifier, and the intermediate medium exchanges heat with the liquefied natural gas in the LNG gasifier, absorbs cold energy released by the liquefied natural gas and gasifies the liquefied natural gas into natural gas; and the air system is connected with the intermediate medium system, air conveyed by the air system exchanges heat with the intermediate medium circularly flowing in the intermediate medium system, cold energy of the intermediate medium is absorbed, and the temperature of the intermediate medium is increased. The liquefied natural gas gasification system is wide in application range, low in energy consumption, high in heat exchange efficiency and high in LNG gasification rate.

Description

Technical Field

[0001] The present application belongs to the field of natural gas technology, and in particular relates to a liquefied natural gas gasification system using air as a heat source. Background Art

[0002] Seawater is commonly used as a heat source for liquefied natural gas (LNG) vaporization and heating at LNG receiving terminals. Using seawater requires significant investment in water intake and drainage infrastructure. Furthermore, seawater systems, which include high-power equipment such as seawater pumps, consume significant energy during daily operation. Furthermore, the cold seawater discharged after heat exchange with LNG must comply with relevant environmental regulations. Furthermore, traditional air-cooled vaporizers utilize natural convection and direct heat exchange between air and LNG, resulting in relatively low vaporization rates.

[0003] Therefore, designing a liquefied natural gas gasification system that uses air as a heat source to save energy and improve operating efficiency is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In view of the above-mentioned problems existing in the prior art, the purpose of the embodiments of the present application is to provide a liquefied natural gas gasification system using air as a heat source.

[0005] The technical solution adopted in the embodiment of the present application is a liquefied natural gas gasification system using air as a heat source, comprising:

[0006] A liquefied natural gas system includes an LNG vaporizer, wherein a cold fluid side inlet of the LNG vaporizer is connected to a liquefied natural gas input pipeline, and a cold fluid side outlet of the LNG vaporizer is connected to a natural gas output pipeline;

[0007] An intermediate medium system includes an intermediate medium circulation pipeline and an intermediate medium evaporator / heater provided on the intermediate medium circulation pipeline; one end of the intermediate medium circulation pipeline is connected to the inlet of the hot fluid side of the LNG vaporizer, and the other end of the intermediate medium circulation pipeline is connected to the outlet of the hot fluid side of the LNG vaporizer; the cold fluid side of the intermediate medium evaporator / heater is connected in series to the intermediate medium circulation pipeline; the intermediate medium in the intermediate medium circulation pipeline exchanges heat with the liquefied natural gas in the LNG vaporizer, absorbs the cold energy released by the liquefied natural gas, and vaporizes the liquefied natural gas into natural gas;

[0008] An air system, comprising an air input pipeline, an air output pipeline and an air conveying device, wherein the air conveying device is arranged on the air input pipeline, one end of the air input pipeline is connected to the inlet of the hot fluid side of the intermediate medium evaporator / heater, one end of the air output pipeline is connected to the outlet of the hot fluid side of the intermediate medium evaporator / heater, and the air conveyed by the air input pipeline exchanges heat with the intermediate medium circulating in the intermediate medium circulation pipeline in the intermediate medium evaporator / heater, absorbs the cold energy of the intermediate medium, and raises the temperature of the intermediate medium.

[0009] In an alternative embodiment, the liquefied natural gas system further includes an NG reheater, the first inlet of the NG reheater is connected to the outlet of the cold fluid side of the LNG vaporizer, and the first outlet of the NG reheater is the natural gas outlet.

[0010] In an alternative embodiment, the air system is also connected to the NG reheater, so that the air conveyed by the air system enters the NG reheater and exchanges heat with the natural gas flowing through the NG reheater in the NG reheater, raising the temperature of the natural gas to a temperature that meets the requirements for external transportation.

[0011] In an alternative embodiment, the intermediate medium circulation system further includes the intermediate medium storage tank and the intermediate medium circulation pump arranged on the intermediate medium circulation pipeline. In the flow direction of the intermediate medium, the intermediate medium storage tank is located upstream of the intermediate medium circulation pump, and the intermediate medium circulation pump is located upstream of the intermediate medium evaporator / heater.

[0012] In an alternative embodiment, the air system further includes an air bypass pipeline. One end of the air bypass pipeline is connected to the air input pipeline, and the other end of the air bypass pipeline is connected to the air output pipeline. The air bypass pipeline is communicated with the hot fluid side of the NG reheater, so that the air conveyed by the air input pipeline enters the hot fluid side of the NG reheater and exchanges heat with the natural gas flowing through the cold fluid side of the NG reheater, absorbing the cold energy of the natural gas.

[0013] In an alternative embodiment, the air conveying device includes an air suction pump or a fan.

[0014] In an alternative embodiment, the air system further includes an air heating device. The air heating device is arranged on the air input pipeline and is located upstream of the air conveying device. The air heating device is used to preheat the air.

[0015] In an alternative embodiment, the air heating device is configured with solar panels to store and utilize the heat for peak shaving.

[0016] In an alternative embodiment, the liquefied natural gas (LNG) vaporization system using air as the heat source further includes a BOG cooler. The cold fluid side of the BOG cooler is connected in series to the air outlet pipeline. The inlet of the hot fluid side of the BOG cooler is connected to the BOG inlet pipeline, and the outlet of the hot fluid side of the BOG cooler is connected to the BOG outlet pipeline. The BOG inlet pipeline feeds the BOG from the receiving station into the BOG cooler, enabling the BOG to exchange heat with the air that absorbs cold energy in the BOG cooler for cooling.

[0017] In an alternative embodiment, the LNG vaporizer is a printed circuit board heat exchanger or a shell and tube heat exchanger; the intermediate medium evaporator / heater is a plate heat exchanger or a shell and tube heat exchanger; the NG reheater is a shell and tube heat exchanger.

[0018] The beneficial effects of the LNG vaporization system using air as the heat source in the embodiments of the present application are as follows: air is used to replace seawater as the heat source, an air delivery device is used to replace natural convection, and an intermediate medium with a low boiling point is used to achieve indirect heat exchange between air and LNG. At the same time, air is used to reheat the vaporized NG. It has a wide range of applications, can also reduce energy consumption, improve heat exchange efficiency, and increase the vaporization rate of LNG.

[0019] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the present application.

[0020] The overview of various implementations or examples of the technology described in the present application is not a full disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example rather than limitation, and are used together with the description and the claims to explain the embodiments of the application being claimed. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts.

[0022] Figure 1 It is a schematic diagram of an LNG vaporization system using air as the heat source in the embodiments of the present application.

[0023] Figure 2 It is another schematic diagram of an LNG vaporization system using air as the heat source in the embodiments of the present application.

[0024] Reference Numerals:

[0025] 1 - LNG vaporizer; 2 - NG temperature compensator; 3 - intermediate medium storage tank; 4 - intermediate medium circulation pump; 5 - intermediate medium evaporation / heater; 6 - air delivery device; 7 - air input pipeline; 8 - air output pipeline; 9 - liquefied natural gas input pipeline; 10 - natural gas output pipeline; 11 - intermediate medium circulation pipeline; 12 - air bypass pipeline; 13 - air heating device; 14 - BOG cooler; 15 - BOG inlet pipeline; 16 - BOG outlet pipeline. Detailed implementation manners

[0026] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present application shall have the ordinary meanings understood by those of ordinary skill in the art to which the present application pertains. The "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] In order to keep the following description of the embodiments of the present application clear and concise, the detailed descriptions of known functions and known components are omitted in the present application.

[0029] As Figure 1 shown, the embodiments of the present application provide a liquefied natural gas vaporization system using air as a heat source, and the liquefied natural gas vaporization system includes a liquefied natural gas system, an intermediate medium system, and an air system.

[0030] In the present application, LNG (Liquefied Natural Gas) is liquefied natural gas, NG (Natural Gas) is natural gas. BOG is the evaporation gas generated by LNG being heated, and the main components of BOG are methane and nitrogen.

[0031] The liquefied natural gas system includes an LNG vaporizer 1. The inlet of the cold fluid side of the LNG vaporizer 1 is connected to the liquefied natural gas input pipeline 9, and the outlet of the cold fluid side of the LNG vaporizer 1 is connected to the natural gas output pipeline 10. Liquefied natural gas is fed into the cold fluid side of the LNG vaporizer 1 through the liquefied natural gas input pipeline 9. After the liquefied natural gas is vaporized into natural gas in the LNG vaporizer 1, it is output via the output pipeline.

[0032] The intermediate medium system is connected to the LNG vaporizer 1 and is used to provide an intermediate medium for the hot fluid side of the LNG vaporizer 1. The intermediate medium exchanges heat with the liquefied natural gas in the LNG vaporizer 1, absorbs the cold energy released by the liquefied natural gas, and vaporizes the liquefied natural gas into natural gas.

[0033] The air system is connected to the intermediate medium system. The air transported by the air system exchanges heat with the intermediate medium circulating in the intermediate medium system, absorbs the cold energy of the intermediate medium, and raises the temperature of the intermediate medium so that the cold energy absorbed from the liquefied natural gas can be recycled.

[0034] The liquefied natural gas vaporization system of the embodiment of the present application uses an intermediate medium to achieve an indirect heat exchange method between air and LNG. Compared with the traditional heat exchange method using seawater as a heat source, it can omit large-power equipment such as seawater intake and drainage facilities and seawater pumps, save energy consumption, and has a wider application range and higher heat exchange efficiency, and can meet the requirements of liquefied natural gas vaporization. [[ID=1']]

[0035] In some embodiments, as Figure 1 shown, the intermediate medium circulation system includes an intermediate medium circulation pipeline 11 and an intermediate medium evaporation / heater 5 provided on the intermediate medium circulation pipeline 11. The intermediate medium circulation pipeline 11 communicates with the cold fluid side of the intermediate medium evaporation / heater 5, that is, the cold fluid side of the intermediate medium evaporation / heater 5 is connected in series to the intermediate medium circulation pipeline 11, so that the intermediate medium in the intermediate medium circulation pipeline 11 flows through the cold fluid side of the intermediate medium evaporation / heater 5 and exchanges heat with the air (to be introduced below) flowing through the hot fluid side of the intermediate medium evaporation / heater 5 to raise the temperature, and the air absorbs the cold energy and is cooled down.

[0036] One end of the intermediate medium circulation pipeline 11 is connected to the inlet of the hot fluid side of the LNG vaporizer 1, and the other end of the intermediate medium circulation pipeline 11 is connected to the outlet of the hot fluid side of the LNG vaporizer 1, so that the intermediate medium flows through the hot fluid side of the LNG vaporizer 1. The intermediate medium exchanges heat with the liquefied natural gas in the LNG vaporizer 1, absorbs the cold energy released by the liquefied natural gas, and cools down, while the liquefied natural gas is heated and vaporized into natural gas.

[0037] In some embodiments, as Figure 1As shown, the air system includes an air input pipeline 7, an air output pipeline 8, and an air conveying device 6. The air conveying device 6 is arranged on the air input pipeline 7. One end of the air input pipeline 7 is connected to the inlet of the hot fluid side of the intermediate medium evaporator / heater 5, and one end of the air output pipeline 8 is connected to the outlet of the hot fluid side of the intermediate medium evaporator / heater 5. The air input pipeline 7 conveys air to the hot fluid side of the intermediate medium evaporator / heater 5, exchanges heat with the intermediate medium flowing through the cold fluid side of the intermediate medium evaporator / heater 5, so that the intermediate medium is heated and can be circulated for heat exchange with liquefied natural gas in the LNG vaporizer 1, absorbing the cold energy of the liquefied natural gas and vaporizing the liquefied natural gas into natural gas. In some embodiments, as Figure 1 shown, the liquefied natural gas system further includes an NG reheater 2, and the first outlet of the NG reheater 2 is connected to the natural gas output pipeline 10. By providing the NG reheater 2, the gasified NG can be reheated to meet the external transmission temperature requirement

[0038] In some embodiments, continuing to combine Figure 1 , the air system is also connected to the NG reheater 2, so that the air conveyed by the air system enters the NG reheater 2 and exchanges heat with the natural gas flowing through the NG reheater 2 in the NG reheater 2 to reheat the natural gas and raise the temperature of the natural gas to the temperature that meets the external transmission requirement.

[0039] Continuing to combine Figure 1 , the intermediate medium circulation system further includes an intermediate medium storage tank 3 and an intermediate medium circulation pump 4 arranged on the intermediate medium circulation pipeline 11. In the flow direction of the intermediate medium, the intermediate medium storage tank 3 is located upstream of the intermediate medium circulation pump 4, and the intermediate medium circulation pump 4 is located upstream of the intermediate medium evaporator / heater 5. By providing the intermediate medium circulation pump 4, power can be provided for the intermediate medium to make the intermediate medium circulate in the intermediate medium circulation pipeline 11. The intermediate medium storage tank 3 can buffer the intermediate medium heated after coming out from the hot fluid side of the LNG vaporizer 1, ensuring that there is enough intermediate medium in the intermediate medium system to participate in circulation and heat exchange. The intermediate medium storage tank 3 can be selectively provided, that is, when the intermediate medium system can meet the usage requirements, the intermediate medium storage tank 3 can be cancelled.

[0040] The air system further includes an air bypass pipeline 12. One end of the air bypass pipeline 12 is connected to the air input pipeline 7, and the other end of the air bypass pipeline 12 is connected to the air output pipeline 8, and the air bypass pipeline 12 is communicated with the hot fluid side of the NG reheater 2, so that the air conveyed by the air input pipeline 7 enters the hot fluid side of the NG reheater 2 and exchanges heat with the natural gas flowing through the cold fluid side of the NG reheater 2, absorbing the cold energy of the natural gas.

[0041] In some embodiments, as Figure 2As shown, the air system further includes an air heating device 13. The air heating device 13 is provided on the air input pipeline 7 and is located upstream of the air conveying device 6. The air heating device is used to preheat the air, and the preheated air is sent by the air conveying device 6 to the hot fluid side of the intermediate medium evaporator / heater 5. The air heating device 13 is used to preheat the air to ensure that the air temperature meets the heat exchange requirements with the intermediate medium, so that the intermediate medium after heat exchange can be heated to the target temperature to effectively absorb the cold energy released by the LNG in the LNG vaporizer 1.

[0042] The air heating device 13 is configured with solar panels to exchange heat between solar energy and air, saving energy. By using solar panels, heat storage and peak shaving utilization can be achieved.

[0043] In some embodiments, as Figure 2 shown, the liquefied natural gas vaporization system using air as a heat source further includes a BOG cooler 14. The cold fluid side of the BOG cooler 14 is connected in series to the air output pipeline 8. The hot fluid side inlet of the BOG cooler 14 is connected to the BOG inlet pipeline 15, and the hot fluid side outlet of the BOG cooler 14 is connected to the BOG outlet pipeline 16. The BOG inlet pipeline 15 sends the BOG from the receiving station into the BOG cooler 14, so that the BOG exchanges heat with the air that has absorbed cold energy in the BOG cooler 14 and cools down.

[0044] This application not only uses air instead of seawater as a heat source, but also conveys the intermediate medium evaporator / heater 5 of the intermediate medium system and the NG temperature compensator 2 of the liquefied natural gas system in a parallel manner. The LNG is vaporized by exchanging heat with the intermediate medium, and then reaches the export temperature requirement after being temperature-compensated by air and is exported. The cooled intermediate medium is heated by the heat of the air and then continues to be used for vaporizing liquefied natural gas. At the same time, the air after absorbing cold energy can also be used to cool the BOG of the receiving station. The design is reasonable, the heat exchange efficiency is high, and the vaporization rate of liquefied natural gas is relatively high.

[0045] Furthermore, the air conveying device 6 may include an air suction pump or a fan. The air suction pump or the fan provides power for the flow of air.

[0046] Optionally, the forms of the LNG vaporizer 1, the intermediate medium evaporator / heater 5, and the NG temperature compensator 2 include but are not limited to printed circuit board heat exchangers, spiral wound heat exchangers, shell and tube heat exchangers, or jacketed heat exchangers, and other available heat exchangers are also acceptable. For example, the LNG vaporizer 1 selects a printed circuit board heat exchanger or a shell and tube heat exchanger; the intermediate medium evaporator / heater 5 selects a plate heat exchanger or a shell and tube heat exchanger; the NG temperature compensator 2 selects a shell and tube heat exchanger.

[0047] Optionally, the intermediate medium can be propane, an aqueous solution of ethylene glycol, or a mixture of ethylene, propylene, and propane. Depending on the heat transfer medium difference, the intermediate medium may undergo a phase change during the system cycle to utilize the latent heat of the intermediate medium, or there may be no phase change, and only the sensible heat of the intermediate medium is utilized to vaporize the LNG in the system. When the intermediate medium is propane, the state of the intermediate medium at the hot fluid side inlet of the LNG vaporizer 1 is gaseous, and the state of the intermediate medium at the hot fluid side outlet is liquid; the natural gas at the cold fluid side inlet and the cold fluid side outlet of the NG temperature compensator 2 are both gaseous, not in a two-phase state.

[0048] When the air temperature provided by the air system is relatively high, the liquefied natural gas vaporization system can use only air as a heat source. When the air temperature is too low to meet the requirements for liquefied natural gas vaporization, the air can be heated by other heat sources such as steam to meet the heat transfer requirements.

[0049] The operation process of the liquefied natural gas vaporization system of the present application is as follows:

[0050] High-pressure LNG sequentially enters the LNG vaporizer 1 and the NG temperature compensator 2 through the liquefied natural gas input pipeline 9. In the LNG vaporizer 1, the high-pressure LNG exchanges heat with the intermediate medium and vaporizes into NG, and then enters the NG temperature compensator 2, where it further exchanges heat with air to increase the temperature, and is output after reaching the temperature required for external transportation;

[0051] Air, as a heat source, first passes through the air heating device 13 for preheating, and then, driven by the power of the air delivery device 6, is divided into two paths and enters the intermediate medium evaporator / heater 5 and the NG temperature compensator 2 respectively; the intermediate medium circulation pump 4 pumps the intermediate medium in the intermediate medium storage tank 3 to the intermediate medium evaporator / heater 5. The intermediate medium is heated and evaporated / heated by one path of air and then enters the LNG vaporizer 1 to vaporize the liquefied natural gas therein. The intermediate medium after heat exchange returns to the intermediate medium storage tank 3 to realize the circulation of the intermediate medium, and the air after heat exchange returns to the air output pipeline 8; the other path of air enters the NG temperature compensator 2, exchanges heat with the low-temperature NG, heats the low-temperature NG to the required temperature and then discharges it, and the air then returns to the air output pipeline 8;

[0052] The low-temperature air in the air output pipeline 8 enters the BOG cooler 14 to cool and exchange heat with the BOG from the receiving terminal.

[0053] The liquefied natural gas (LNG) vaporization system using air as the heat source according to the embodiments of the present application uses air instead of seawater, employs an air conveying device 6 to replace natural convection, and uses an intermediate medium with a low boiling point (e.g., propane, ethylene glycol aqueous solution) to achieve indirect heat exchange between air and LNG. At the same time, air is used to supplement the temperature of the vaporized NG. Among them, LNG is vaporized by the sensible heat of the intermediate medium. The cooled intermediate medium is heated by the heat of the incoming air and then used to vaporize the liquefied natural gas.

[0054] The liquefied natural gas vaporization system using air as the heat source according to the embodiments of the present application has a wide range of applications and has the following technical advantages:

[0055] 1. Using air as the heat source, compared with the traditional seawater heat source, seawater intake and drainage facilities and high-power equipment such as seawater pumps can be omitted, saving energy consumption.

[0056] 2. Selecting air as the heat source, compared with the discharge restrictions of cold seawater, the liquefied natural gas vaporization system using air as the heat source has a wider range of applications.

[0057] 3. Air enters the intermediate medium evaporator / heater 5 and the NG temperature compensator 2 in parallel. Compared with the series connection method, the heat transfer temperature difference of the heat exchanger can be increased, and the heat transfer area of the heat exchanger can be reduced.

[0058] 4. Air is transported in and out through pipelines. Compared with natural convection, the air flow rate and trajectory can be controlled, improving the operation efficiency and controllability.

[0059] 5. Using solar energy to preheat the air ensures that the air has sufficient heat, and at the same time achieves zero-carbon treatment.

[0060] 6. The air that absorbs cold after heat exchange cools the BOG in the receiving station. Through the utilization of cold energy, the processing capacity of the recondenser in the receiving station can be effectively reduced, and the volume of the recondenser can be reduced.

[0061] The above description is intended to be illustrative rather than restrictive. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of their solutions) can be used in combination with each other, and considering these embodiments, they can be combined with each other in various combinations or permutations.

Claims

1. A liquefied natural gas vaporization system using air as a heat source, characterized in that, Comprising: A liquefied natural gas system, including an LNG vaporizer, the cold fluid side inlet of the LNG vaporizer is connected to the liquefied natural gas input pipeline, and the cold fluid side outlet of the LNG vaporizer is connected to the natural gas output pipeline; An intermediate medium system, including an intermediate medium circulation pipeline and an intermediate medium evaporator / heater provided on the intermediate medium circulation pipeline; One end of the intermediate medium circulation pipeline is connected to the inlet of the hot fluid side of the LNG vaporizer, and the other end of the intermediate medium circulation pipeline is connected to the outlet of the hot fluid side of the LNG vaporizer; the cold fluid side of the intermediate medium evaporator / heater is connected in series on the intermediate medium circulation pipeline; The intermediate medium in the intermediate medium circulation pipeline exchanges heat with the liquefied natural gas in the LNG vaporizer, absorbs the cold energy released by the liquefied natural gas, and vaporizes the liquefied natural gas into natural gas; An air system, including an air input pipeline, an air output pipeline and an air conveying device, the air conveying device is provided on the air input pipeline, one end of the air input pipeline is connected to the inlet of the hot fluid side of the intermediate medium evaporator / heater, one end of the air output pipeline is connected to the outlet of the hot fluid side of the intermediate medium evaporator / heater, the air conveyed by the air input pipeline exchanges heat with the intermediate medium circulating in the intermediate medium circulation pipeline in the intermediate medium evaporator / heater, absorbs the cold energy of the intermediate medium, and raises the temperature of the intermediate medium.

2. The liquefied natural gas gasification system using air as a heat source according to claim 1, wherein The liquefied natural gas system further includes an NG temperature compensator, the first inlet of the NG temperature compensator is connected to the outlet of the cold fluid side of the LNG vaporizer, and the first outlet of the NG temperature compensator is the natural gas outlet.

3. The liquefied natural gas gasification system using air as the heat source according to claim 2, characterized in that, The air system is also connected to the NG temperature compensator, so that the air conveyed by the air system enters the NG temperature compensator and exchanges heat with the natural gas flowing through the NG temperature compensator in the NG temperature compensator, so that the natural gas is heated to the temperature meeting the external transmission requirements.

4. A liquefied natural gas gasification system using air as a heat source according to claim 1, characterized in that, The intermediate medium circulation system further includes the intermediate medium storage tank and the intermediate medium circulation pump provided on the intermediate medium circulation pipeline. In the flow direction of the intermediate medium, the intermediate medium storage tank is located upstream of the intermediate medium circulation pump, and the intermediate medium circulation pump is located upstream of the intermediate medium evaporator / heater.

5. A liquefied natural gas gasification system using air as a heat source according to claim 2, characterized in that, The air system further includes an air bypass pipeline, one end of the air bypass pipeline is connected to the air input pipeline, the other end of the air bypass pipeline is connected to the air output pipeline, and the air bypass pipeline is communicated with the hot fluid side of the NG temperature compensator, so that the air conveyed by the air input pipeline enters the hot fluid side of the NG temperature compensator and exchanges heat with the natural gas flowing through the cold fluid side of the NG temperature compensator, and absorbs the cold energy of the natural gas.

6. The liquefied natural gas gasification system using air as a heat source according to claim 5, wherein The air conveying device includes an air suction pump or a fan.

7. The liquefied natural gas gasification system using air as a heat source according to claim 1, characterized in that, The air system further includes an air heating device, the air heating device is provided on the air input pipeline and is located upstream of the air conveying device, and the air heating device is used for preheating the air.

8. A liquefied natural gas gasification system using air as a heat source according to claim 7, characterized in that, The air heating device is configured with a solar panel to store and peak-shavingly utilize the heat.

9. A liquefied natural gas vaporization system using air as a heat source according to claim 1, characterized in that, The liquefied natural gas vaporization system using air as the heat source further includes a BOG cooler. The cold fluid side of the BOG cooler is connected in series to the air outlet pipeline. The inlet of the hot fluid side of the BOG cooler is connected to the BOG inlet pipeline, and the outlet of the hot fluid side of the BOG cooler is connected to the BOG outlet pipeline. The BOG inlet pipeline feeds the BOG from the receiving station into the BOG cooler, enabling the BOG to exchange heat with the air that absorbs cold energy in the BOG cooler for cooling.

10. The liquefied natural gas gasification system using air as a heat source according to claim 2, characterized in that, The LNG vaporizer is selected from a printed circuit board heat exchanger or a shell and tube heat exchanger; the intermediate medium evaporator / heater is selected from a plate heat exchanger or a shell and tube heat exchanger; the NG temperature compensator is selected from a shell and tube heat exchanger.

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