A ship-based LNG gas vaporization heat exchange system and its heat exchange process

Abstract

The present invention discloses a ship-based LNG gas vaporization heat exchange system and its heat exchange process, including: a liquid supply module for outputting LNG; multiple gas-liquid heat exchange modules, all selectively connected to the liquid supply module through a liquid supply pipeline, and having heated methane inside for heat exchange with LNG; a connecting pipeline arranged between adjacent two gas-liquid heat exchange modules; when the connecting pipeline is connected to adjacent two gas-liquid heat exchange modules, the adjacent two gas-liquid heat exchange modules are connected in series; a methane supply module connected to the corresponding gas-liquid heat exchange module and the liquid supply pipeline. Through the above settings, the present invention can not only achieve efficient heat exchange of LNG, but also effectively reduce the volume and floor area of the equipment, and can also be compatible with the gas supply requirements of different equipment for vaporized LNG to realize flexible supply of vaporized LNG, and can also make full use of the resources on the ship to achieve the purpose of energy conservation and emission reduction.

Description

Technical Field

[0001] The present invention relates to the field of liquefied gas storage and vaporization on ships, and particularly to a ship-based LNG gas vaporization heat exchange system and its heat exchange process. Background Art

[0002] At present, with the booming development of the global shipping industry, energy transformation has become a key issue for the sustainable development of the industry. Liquefied natural gas (LNG) has been increasingly widely used in the field of ship fuels due to its significant advantages of environmental friendliness and high energy density. With the in-depth penetration of LNG in the ship industry, efficient LNG vaporization technology has become the core element to ensure the stable operation of ships and reduce operating costs.

[0003] In the existing LNG vaporization technology system, traditional heat exchange vaporization equipment has exposed many drawbacks. Specifically as follows:

[0004] Firstly, from the aspects of equipment structure and cost, common liquid-liquid (such as ethylene glycol aqueous solution and LNG, seawater and LNG, etc.) or gas-liquid (such as air and LNG, etc.) heat exchange methods require a large heat exchange area to achieve efficient heat exchange. This has significantly increased the equipment size, with lengths often reaching more than ten meters, not only occupying a large amount of precious space on the ship but also resulting in high equipment costs, imposing an economic burden on ship operators.

[0005] Secondly, from the perspective of energy consumption analysis, to maintain a large gas and liquid flow circulation, such as air, ethylene glycol solution, seawater for absorbing cold, and heating steam, etc., a large amount of electric energy or fuel is required to provide power. In addition, to build and maintain these circulation systems, a series of auxiliary equipment, such as ethylene glycol solution circulation pumps, seawater pumps, solution storage tanks, solution steam heating heat exchangers, etc., are also needed, further exacerbating energy consumption and equipment complexity.

[0006] Finally, from the aspect of gas supply flexibility, traditional vaporization equipment is difficult to meet the diverse requirements of different equipment on the ship for methane gas in terms of temperature and gas volume. That is, during the operation of the ship, different equipment, such as the starting system, navigation propulsion system, auxiliary power generation equipment, etc., have quite different requirements for the temperature and flow rate of the fuel gas. Traditional vaporization equipment cannot accurately adjust the gas supply temperature and is difficult to provide gas of multiple temperature ranges with a set of process equipment, resulting in low energy utilization efficiency and being unable to fully utilize the advantages of LNG as a high-quality fuel.

[0007] Therefore, a ship-based LNG gas vaporization heat exchange system and its heat exchange process are needed to solve the above problems. Summary of the Invention

[0008] The object of the present invention is to provide a ship-based LNG gas vaporization heat exchange system and its heat exchange process, which can not only complete efficient heat exchange of LNG, but also effectively reduce the volume and floor area of equipment, and can also be compatible with the gas supply requirements of different equipment for vaporized LNG to achieve flexible supply of vaporized LNG, and can also make full use of the resources on the ship to achieve the purpose of energy conservation and emission reduction.

[0009] To solve the above technical problems, the present invention provides a ship-based LNG gas vaporization heat exchange system, including:

[0010] A liquid supply module for outputting LNG;

[0011] Multiple gas-liquid heat exchange modules, all of which are selectively connected to the liquid supply module through a liquid supply pipeline, enabling parallel connection between adjacent two gas-liquid heat exchange modules, and having heated methane inside for heat exchange with LNG;

[0012] A connecting pipeline is arranged between adjacent two gas-liquid heat exchange modules for controlling the connection or disconnection of adjacent two gas-liquid heat exchange modules;

[0013] When the connecting pipeline is connected to adjacent two gas-liquid heat exchange modules, the adjacent two gas-liquid heat exchange modules are connected in series to transfer vaporized LNG, enabling the vaporized LNG to be heated in a cascaded manner;

[0014] A methane supply module is connected to the corresponding gas-liquid heat exchange module and the liquid supply pipeline, for receiving the LNG input by the liquid supply pipeline, generating the heated methane through LNG, and supplying it to the gas-liquid heat exchange module.

[0015] Further, the gas-liquid heat exchange module includes a heat exchange cavity with a liquid inlet, a liquid outlet, a gas inlet, and a gas outlet;

[0016] The methane supply module is connected to the gas inlet and the liquid outlet of the corresponding heat exchange cavity and forms a circulation loop;

[0017] The methane supply module is used to heat the LNG input by the liquid supply pipeline and the unvaporized LNG output from the liquid outlet to form the heated methane and input it into the heat exchange cavity.

[0018] Further, the liquid inlet and the gas outlet are arranged at the top of the heat exchange cavity;

[0019] The liquid outlet and the gas inlet are arranged at the bottom of the heat exchange cavity.

[0020] Further, the gas-liquid heat exchange module further includes a liquid distributor and a gas distribution pipe;

[0021] The liquid distributor and the gas distribution pipe are respectively communicated with the air inlet and the liquid inlet.

[0022] Further, the methane supply module includes a circulating heating pipe and a first electromagnetic heater with both ends respectively communicated with the air inlet and the liquid outlet;

[0023] The first electromagnetic heater is arranged in the middle of the circulating heating pipe and is used to provide temperature for the generation of the heated methane.

[0024] Further, the gas-liquid heat exchange module is a supergravity rotating heat exchanger bed and is internally provided with a rotor structure for increasing the specific surface area of contact between LNG and the heated methane.

[0025] Further, the gasification LNG output ends of the gas-liquid heat exchange modules in the middle and at the ends of multiple said connecting pipelines are respectively connected with a first gas supply pipeline and a second gas supply pipeline;

[0026] The first gas supply pipeline is respectively used for the pressure boosting of the tank and the cleaning of pipelines or tanks;

[0027] The second gas supply pipeline is used for the supply of fuel for the cabin engine.

[0028] Further, the second gas supply pipeline includes a normal temperature gas supply pipeline and a high temperature gas supply pipeline, which are respectively used to provide fuel for the cabin engine under different working conditions;

[0029] A second electromagnetic heater is arranged on the high temperature gas supply pipeline and is used to reheat and raise the temperature of the gasified LNG output by the gas-liquid heat exchange module at the end.

[0030] Further, the second gas supply pipeline is communicated with the first gas supply pipeline and between adjacent two first gas supply pipelines through bypass pipes;

[0031] When two adjacent groups of the gas-liquid heat exchange modules are in parallel, the LNG output by the liquid supply pipeline can respectively pass through multiple groups of the gas-liquid heat exchange modules and flow back into the first gas supply pipeline for the large-scale supply of gasified LNG.

[0032] Further, it also includes a wind turbine power generation module and an energy storage module;

[0033] The input end of the energy storage module is connected with the wind turbine power generation module, and the output end is connected with the gas-liquid heat exchange module and the methane supply module for providing energy.

[0034] Further, it also includes a liquid supply adjustment module;

[0035] The liquid supply adjustment module is connected to the liquid supply pipeline and the methane supply module, and is used to adjust the LNG gas volume provided to the gas-liquid heat exchange module and the methane supply module according to the flow monitoring component provided in the liquid supply pipeline.

[0036] On the other hand, the present invention also proposes a heat exchange process based on the gasification of ship LNG gas. The heat exchange process includes two modes: series heat exchange and parallel heat exchange, which are respectively used for the conventional gas supply and large gas supply of LNG.

[0037] Further, when the heat exchange process is in the series heat exchange mode, it specifically includes the following steps:

[0038] Control the liquid supply module to be only connected to the initial gas-liquid heat exchange module, and make the connection pipeline communicate with adjacent two groups of gas-liquid heat exchange modules, so that adjacent two groups of gas-liquid heat exchange modules are in series;

[0039] Control the liquid supply module to output LNG, and transport LNG to the initial gas-liquid heat exchange module and the methane supply module respectively through the liquid supply pipeline;

[0040] The methane supply module generates heated methane through the LNG input by the liquid supply pipeline, and inputs the heated methane into the initial gas-liquid heat exchange module to perform heat exchange with LNG to complete the gasification of LNG;

[0041] Output a part of the gasified LNG to the required supply pipeline through the first gas supply pipeline connected to the connection pipeline, and output another part of the gasified LNG to the next gas-liquid heat exchange module for stepped heat exchange and temperature rise until the gasified LNG circulates to be discharged through the second gas supply pipeline connected to the end gas-liquid heat exchange module.

[0042] Further, when the heat exchange process is in the parallel heat exchange mode, it specifically includes the following steps:

[0043] Control the liquid supply module to be connected to multiple groups of gas-liquid heat exchange modules, and disconnect the connection pipeline so that adjacent two groups of gas-liquid heat exchange modules operate in parallel;

[0044] Control the liquid supply module to output LNG, and transport LNG to multiple groups of gas-liquid heat exchange modules and the methane supply module simultaneously through the liquid supply pipeline;

[0045] The methane supply module generates heated methane through the LNG input by the liquid supply pipeline, and inputs the heated methane into the corresponding gas-liquid heat exchange module to perform heat exchange with LNG to complete the gasification of LNG;

[0046] The gasified LNG flows back to the required first gas supply pipeline through the bypass pipe to complete the large supply of the gasified LNG.

[0047] Compared with the prior art, the present invention has at least the following beneficial effects:

[0048] By providing a liquid supply module, a gas-liquid heat exchange module, a connecting pipeline, and a methane supply module, and connecting the liquid supply module to the gas-liquid heat exchange module and the methane supply module, and connecting the methane supply module to the gas-liquid heat exchange module, during the heat exchange process, only the same medium (LNG) is used for heat exchange, that is, the cold energy and heat energy of LNG are in direct contact for heat exchange, without introducing additional heat exchange media. Therefore, compared with the prior art that uses other media for heat exchange, direct contact heat exchange can effectively improve the heat exchange rate, and can effectively avoid the energy consumption required for heating or cooling additional media, improve energy utilization efficiency, and can also avoid the space occupied by the supporting equipment structure required for using other media in the prior art. That is, while achieving efficient heat exchange of LNG, it can also reduce the equipment volume and the occupied space.

[0049] Moreover, by selectively connecting the liquid supply module to multiple gas-liquid heat exchange modules through a liquid supply pipeline, and providing a connecting pipeline that can be connected or disconnected between adjacent two gas-liquid heat exchange modules, the multiple gas-liquid heat exchange modules can be connected in parallel or in series. Therefore, the system can flexibly adjust the operation mode according to the actual gas consumption demand of the ship, such as connecting in parallel to achieve a large amount of gas supply, and connecting in series to precisely control the gas temperature, meeting the gas supply application requirements under different working conditions.

[0050] In addition, through the modular design of multiple gas-liquid heat exchange modules, when the initial gas-liquid heat exchange module fails, the failed initial gas-liquid heat exchange module can be disconnected by controlling the connecting pipeline, and the next normal gas-liquid heat exchange module can be connected to the liquid supply module to continue working, ensuring continuous gas supply to the system, improving reliability and stability. And because each component is relatively independent, it also achieves the purpose of being convenient for maintenance and repair. In addition, when it is necessary to increase the gas supply capacity, only the number of gas-liquid heat exchange modules needs to be increased, which has good scalability.

[0051] Furthermore, by providing a methane supply module including a circulating heating pipe and a first electromagnetic heater, and a heat exchange cavity including a liquid inlet, a liquid outlet, a gas inlet, and a gas outlet, and connecting the two ends of the circulating heating pipe to the gas inlet and the liquid outlet respectively to form a circulating loop, the first electromagnetic heater can heat the LNG input from the liquid supply pipeline and the unvaporized LNG output from the liquid outlet to form heated methane, and exchange heat with the LNG until the vaporized LNG is discharged from the gas outlet. This circulating heating method can recover and utilize the heat in the unvaporized LNG, reduce additional energy input, and reduce energy consumption.

[0052] Further, by setting up a wind turbine power generation module and an energy storage module, and connecting the energy storage module to the gas-liquid heat exchange module and the methane supply module. Since continuous wind power is generated during the navigation of the ship, the wind turbine power generation module can convert this part of the wind energy into electrical energy, and the energy storage module stores this electrical energy and provides energy for the gas-liquid heat exchange module and the methane supply module. This reduces the dependence of the entire heat exchange system on the main power supply of the ship, realizes energy self-sufficiency to a certain extent, reduces the overall energy consumption and operation cost of the ship, so as to achieve the purpose of energy conservation and emission reduction.

[0053] Further, a liquid supply adjustment module is also set up, and the liquid supply adjustment module can adjust the LNG gas volume provided to the gas-liquid heat exchange module and the methane supply module according to the flow monitoring component on the liquid supply pipeline. When the gas demand of the ship changes, such as in different working conditions such as startup, acceleration, and cruising, when the system has different requirements for the volume and temperature of the vaporized LNG, the liquid supply adjustment module can respond in a timely manner and provide the appropriate volume of LNG to ensure the efficient vaporization of the gas-liquid heat exchange module and meet the supply demand, that is, the system always maintains the best operating state and avoids the occurrence of LNG waste or insufficient supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic structural diagram of a ship-based LNG gas vaporization heat exchange system in an embodiment of the present invention;

[0055] Figure 2 It is a schematic partial structural diagram of a ship-based LNG gas vaporization heat exchange system in an embodiment of the present invention.

[0056] Reference numerals in the drawings: 1, liquid supply module; 2, gas-liquid heat exchange module; 21, heat exchange cavity; 22, liquid distributor; 23, gas distribution pipe; 3, liquid supply pipeline; 4, connection pipeline; 5, methane supply module; 51, circulating heating pipe; 52, first electromagnetic heater; 6, first gas supply pipeline; 7, second gas supply pipeline; 71, normal temperature gas supply pipeline; 72, high temperature gas supply pipeline; 721, second electromagnetic heater; 8, wind turbine power generation module; 9, energy storage module; 10, liquid supply adjustment module; 11, bypass pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] The ship-based LNG gas vaporization heat exchange system and its heat exchange process of the present invention will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present invention.

[0058] The present invention will be described more specifically by way of example with reference to the accompanying drawings in the following paragraphs. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.

[0059] Embodiment 1

[0060] As Figure 1 and Figure 2 shown, an embodiment of the present invention provides a ship-based LNG gasification heat exchange system, including:

[0061] A liquid supply module 1 for outputting LNG.

[0062] Multiple gas-liquid heat exchange modules 2 are all selectively connected to the liquid supply module 1 through a liquid supply pipeline 3, enabling parallel connection between adjacent two gas-liquid heat exchange modules 2, and having heated methane inside for heat exchange with LNG.

[0063] It should be noted that heated methane and LNG are different states of the same medium, namely gaseous and liquid states. Therefore, in this embodiment, by using heated methane as the heat exchange medium for LNG, there is no need to input an additional medium for heat exchange. Furthermore, compared with the prior art method of using different media for heat exchange, this method does not require a large heat exchange area, enabling the equipment size to be significantly reduced, improving space utilization rate while reducing equipment costs. And this method can also achieve direct contact between heated methane and LNG. Compared with the prior art method where different media are indirectly contacted through auxiliary pipelines, the heat exchange rate can be effectively increased. Therefore, this system can achieve the purpose of efficiently exchanging heat for LNG while effectively reducing the volume and floor area of the equipment.

[0064] A connection pipeline 4 is arranged between adjacent two gas-liquid heat exchange modules 2 for controlling the connection or disconnection between adjacent two gas-liquid heat exchange modules 2.

[0065] Wherein, when the connection pipeline 4 is connected to adjacent two gas-liquid heat exchange modules 2, adjacent two gas-liquid heat exchange modules 2 are connected in series to transfer vaporized LNG, enabling the vaporized LNG to be heated in a cascaded manner.

[0066] Therefore, in combination with the above method of selectively connecting multiple gas-liquid heat exchange modules 2 to the liquid supply module 1 through the liquid supply pipeline 3, this system can switch modes according to requirements (such as controlling the series or parallel connection of multiple gas-liquid heat exchange modules 2), thereby meeting the application requirements in different scenarios.

[0067] In a specific example, when LNG needs to be heated in a stepped manner to meet the supply requirements of different devices for vaporized LNG at different temperature ranges. The system can connect multiple groups of gas-liquid heat exchange modules 2 in sequence through the connecting pipeline 4, and only connect the liquid supply module 1 to the initial gas-liquid heat exchange module 2. Then, LNG will sequentially pass through the gas-liquid heat exchange modules 2 for heat exchange and vaporization, and the vaporized LNG can gradually enter the next gas-liquid heat exchange module 2 to achieve the function of stepped heating. Furthermore, a branch can be provided in the middle of the connecting pipeline 4 so that the vaporized LNG located between two groups of gas-liquid heat exchange modules 2 can be output to a specified device, thereby achieving the purpose of meeting the supply requirements of different devices for vaporized LNG at different temperature ranges.

[0068] In another specific example, when a large amount of low-temperature LNG supply is required to meet the equipment supply demand. The system can disconnect the connecting pipeline 4 and connect multiple groups of gas-liquid heat exchange modules 2 to the liquid supply module 1. Therefore, multiple groups of gas-liquid heat exchange modules 2 can simultaneously heat and vaporize LNG to meet the above application requirements.

[0069] In summary, the present system can flexibly adjust the operation mode according to the actual gas consumption demand of the ship. For example, it can be connected in parallel to achieve a large amount of gas supply, or connected in series to precisely control the gas temperature, effectively meeting the gas supply application requirements under different working conditions.

[0070] In addition, through the modular design of multiple groups of gas-liquid heat exchange modules 2, when the initial gas-liquid heat exchange module 2 fails, the initial gas-liquid heat exchange module 2 can be disconnected by controlling the connecting pipeline 4, and the next normal gas-liquid heat exchange module 2 can be connected to the liquid supply module 1 to continue working, ensuring continuous gas supply of the system, improving reliability and stability. Moreover, since the components are relatively independent of each other, it also achieves the purpose of being convenient for maintenance and repair. Additionally, when it is necessary to increase the gas supply capacity, only the number of gas-liquid heat exchange modules 2 needs to be increased, which has good scalability.

[0071] The methane supply module 5 is connected to the corresponding gas-liquid heat exchange module 2 and the liquid supply pipeline 3, and is used to receive the LNG input by the liquid supply pipeline 3, and generate the heated methane through the LNG and supply it to the gas-liquid heat exchange module 2. That is, the LNG output from the liquid supply pipeline 3 is vaporized by the methane supply module 5 to form heated methane, and then the heated methane is input into the gas-liquid heat exchange module 2 to exchange heat with the LNG in the gas-liquid heat exchange module 2 to output vaporized LNG.

[0072] It should be particularly noted that the vaporized LNG output from the gas-liquid heat exchange module 2 includes heated methane and the vaporized LNG formed after partial LNG exchanges heat with the heated methane.

[0073] In a further embodiment, the gas-liquid heat exchange module 2 is further defined to improve the heat exchange and vaporization effect of LNG.

[0074] Specifically, the gas-liquid heat exchange module 2 includes a heat exchange cavity 21 having a liquid inlet, a liquid outlet, a gas inlet, and a gas outlet.

[0075] Among them, the methane supply module 5 is connected to the gas inlet and the liquid outlet corresponding to the heat exchange cavity 21, and forms a circulation loop. The methane supply module 5 can heat the LNG input from the liquid supply pipeline 3 and the unvaporized LNG output from the liquid outlet to form the heated methane, and input it into the heat exchange cavity 21. That is, the unvaporized LNG returns to the methane supply module 5 through the liquid outlet, is mixed with the fresh LNG input from the liquid supply pipeline 3 and then heated again. This cyclic heating method can recover and utilize the heat in the unvaporized LNG, reduce the input of additional energy, lower the energy consumption, and increase the gasification rate of LNG by more than 30%.

[0076] It should be particularly noted that the liquid inlet and the gas outlet are arranged at the top of the heat exchange cavity 21, and the liquid outlet and the gas inlet are arranged at the bottom of the heat exchange cavity 21. By allowing the heated methane to enter from the bottom gas inlet and the LNG to be sprayed from the top liquid inlet, a countercurrent contact can be formed, thereby effectively prolonging the gas-liquid contact time, improving the mass transfer efficiency, and increasing the utilization rate of the heat exchange area by 50%, achieving the purpose of further improving the heat exchange effect.

[0077] In other embodiments, the gas-liquid heat exchange module 2 further includes a liquid distributor 22 and a gas distribution pipe 23. The liquid distributor 22 and the gas distribution pipe 23 are respectively communicated with the gas inlet and the liquid inlet. By providing the liquid distributor 22 and the gas distribution pipe 23, the LNG and the heated methane are evenly distributed in the heat exchange cavity, avoiding local overheating or overcooling, making the entire heat exchange process more balanced, improving the heat exchange quality, and achieving the purpose of enhancing the heat exchange uniformity. Moreover, it can also increase the contact area between the LNG and the heated methane, accelerate the gasification speed of the LNG, and significantly improve the heat and mass transfer efficiency, achieving the purpose of improving the working efficiency of the gas-liquid heat exchange module 2.

[0078] In this embodiment, the methane supply module 5 includes a circulation heating pipe 51 and a first electromagnetic heater 52 with both ends respectively communicated with the gas inlet and the liquid outlet. The first electromagnetic heater 52 is arranged in the middle of the circulation heating pipe 51 and is used to provide the temperature for the generation of the heated methane. By providing the circulation heating pipe 51 and the first electromagnetic heater 52, the methane supply module 5 can mix the LNG input from the liquid supply pipeline 3 with the unvaporized LNG returned from the liquid outlet, heat it to form the heated methane by the temperature provided by the first electromagnetic heater 52, and then transport it to the heat exchange cavity 21 through the circulation heating pipe 51, ensuring that the gas-liquid heat exchange module 2 continuously obtains a stable heat source and improving the gasification efficiency of LNG.

[0079] In other embodiments, to further improve the working efficiency of the gas-liquid heat exchange module 2, the gas-liquid heat exchange module 2 is set as a high-gravity rotary heat exchange bed and is internally provided with a rotor structure to increase the specific surface area of the contact between LNG and the heated methane, thus effectively strengthening the heat and mass transfer process, accelerating the gasification rate of LNG, significantly improving the working efficiency of the gas-liquid heat exchange module 2, and providing a more efficient gasified LNG supply for the ship.

[0080] In other embodiments, to facilitate the output of gasified LNG to the required equipment, a first gas supply pipeline 6 and a second gas supply pipeline 7 are further provided to facilitate the transfer and output of gasified LNG.

[0081] Specifically, the middle parts of the plurality of connecting pipelines 4 and the gasification LNG output ends of the gas-liquid heat exchange module 2 at the ends are respectively connected to the first gas supply pipeline 6 and the second gas supply pipeline 7.

[0082] The first gas supply pipeline 6 is respectively used for the pressure boost of the tank and the cleaning of the pipeline or the tank.

[0083] The second gas supply pipeline 7 is used for the supply of fuel for the cabin engine.

[0084] It should be noted that the gasified LNG output by the first gas supply pipeline 6 is a low-temperature gas, while the gasified LNG output by the second gas supply pipeline 7 is a high-temperature gas.

[0085] In a further embodiment, the second gas supply pipeline 7 includes a normal-temperature gas supply pipeline 71 and a high-temperature gas supply pipeline 72, which are respectively used to provide fuel for the cabin engine under different working conditions.

[0086] Among them, a second electromagnetic heater 721 is provided on the high-temperature gas supply pipeline 72 to reheat and raise the temperature of the gasified LNG output by the gas-liquid heat exchange module 2 at the end.

[0087] In other embodiments, to enable the centralized supply of gasified LNG under the parallel connection of multiple gas-liquid heat exchange modules 2, a bypass pipe 11 is further provided to connect multiple first gas supply pipelines 6 and second gas supply pipelines 7.

[0088] Specifically, the second gas supply pipeline 7 and the first gas supply pipeline 6 are connected through the bypass pipe 11, and adjacent two first gas supply pipelines 6 are also connected through the bypass pipe 11.

[0089] Among them, when two adjacent groups of gas-liquid heat exchange modules 2 are connected in parallel, the LNG output by the liquid supply pipeline 3 can respectively pass through multiple groups of gas-liquid heat exchange modules 2 and flow back to the first gas supply pipeline 6 for the large-scale supply of gasified LNG.

[0090] It should be noted that, since the main component of LNG is methane, its boiling point is -162°C. When heated, the liquid quickly vaporizes into gas, and the volume expands by about 600-700 times. Therefore, it is necessary to control the temperature in stages to make the gasified LNG step-by-step heated, so that the gas is slowly released to avoid sudden changes in pressure. When multiple groups of gas-liquid heat exchange modules 2 are in parallel operation, due to the lack of a step-by-step heating process, the LNG cannot gradually increase its temperature. This makes the temperature increase of the generated gasified LNG in this case relatively limited, and it is difficult to meet the supply requirements of high-temperature gasified LNG. Therefore, the gasified LNG generated at this time is more suitable for large-scale supply of the first gas supply pipeline 6 to meet the tank pressurization and pipeline or tank cleaning, which have relatively low requirements for gas temperature but large gas volume.

[0091] It should also be noted that the connecting valve on the connecting pipeline 4 is located on the side of the first gas supply pipeline 6 away from the gasified LNG transportation direction, that is, when the connecting pipeline 4 is disconnected, the gasified LNG can still be output from the connecting pipeline 4 to the first gas supply pipeline 6 to complete the output of the gasified LNG.

[0092] In other embodiments, a ship-based LNG gasification heat exchange system further includes a wind tube power generation module 8 and an energy storage module 9.

[0093] The input end of the energy storage module 9 is connected to the wind tube power generation module 8, and the output end is connected to the gas-liquid heat exchange module 2 and the methane supply module 5, so as to provide energy.

[0094] Specifically, since the ship will generate continuous wind power during navigation, the wind tube power generation module 8 can convert this part of wind energy into electrical energy, and the energy storage module 9 stores this electrical energy and provides energy for the gas-liquid heat exchange module 2 and the methane supply module 5 (such as the rotation power of the rotor structure of the gas-liquid heat exchange module 2 and the power required for the operation of the first electromagnetic heater 52, etc.). This reduces the dependence of the entire heat exchange system on the main power supply of the ship, achieves energy self-sufficiency to a certain extent, reduces the overall energy consumption and operating costs of the ship, and achieves the purpose of energy conservation and emission reduction.

[0095] In addition, the energy storage module 9 is also connected to the second electromagnetic heater 721 to provide energy for heating the gasified LNG in the high-temperature gas supply pipeline 72 .

[0096] Furthermore, a ship-based LNG gasification heat exchange system also includes a liquid supply regulating module 10.

[0097] The liquid supply adjustment module 10 is connected to the liquid supply pipeline 3 and the methane supply module 5, and is used to adjust the LNG gas volume provided to the gas-liquid heat exchange module 2 and the methane supply module 5 according to a flow monitoring component (not labeled in the figure) provided in the liquid supply pipeline 3.

[0098] By providing the liquid supply adjustment module 10, when the gas demand of the ship changes, such as in different working conditions such as startup, acceleration, and cruising, when the system has different requirements for the volume and temperature of vaporized LNG, the liquid supply adjustment module 10 can respond in a timely manner, provide LNG with an appropriate gas volume, ensure the efficient vaporization of the gas-liquid heat exchange module 2, meet the supply demand, that is, enable the system to always maintain the best operating state, and avoid the occurrence of LNG waste or insufficient supply.

[0099] Embodiment 2

[0100] On the other hand, the present invention also proposes a heat exchange process based on the vaporization of ship LNG gas. The heat exchange process includes two modes: series heat exchange and parallel heat exchange, which are respectively used for the conventional gas supply and large gas supply of LNG. That is, it can flexibly switch between series or parallel modes according to demand. For example, in the series mode, LNG can be heated step by step to meet the supply demand of different equipment for vaporized LNG at different temperature intervals. In the parallel mode, multiple groups of gas-liquid heat exchange modules 2 can simultaneously heat and vaporize LNG to meet the demand for a large amount of low-temperature LNG gas supply. For example, in the case of ship startup or rapid gas replenishment, the parallel mode can quickly provide sufficient gas volume. Therefore, this flexible mode switching ability enables the system to adapt to the gas demand of the ship under different working conditions, whether it is normal navigation, acceleration, deceleration, or docking, etc., and can ensure stable and efficient gas supply, enhancing the overall adaptability and reliability of the system.

[0101] Wherein, when the heat exchange process is in the series heat exchange mode, it specifically includes the following steps:

[0102] Control the liquid supply module 1 to be only connected to the initial gas-liquid heat exchange module 2, and make the connection pipeline 4 communicate with two adjacent groups of gas-liquid heat exchange modules 2, so that two adjacent groups of gas-liquid heat exchange modules 2 are connected in series;

[0103] Control the liquid supply module 1 to output LNG, and respectively transport the LNG to the initial gas-liquid heat exchange module 2 and the methane supply module 5 through the liquid supply pipeline 3;

[0104] The methane supply module 5 generates heated methane through the LNG input from the liquid supply pipeline 3, and inputs the heated methane into the initial gas-liquid heat exchange module 2 to perform heat exchange with the LNG to complete the vaporization of the LNG;

[0105] Output a part of the vaporized LNG from the first gas supply pipeline 6 connected to the connecting pipeline 4 into the required supply pipeline, and output another part of the vaporized LNG into the next gas-liquid heat exchange module 2 for step-by-step heat exchange and temperature rise until the vaporized LNG circulates to be discharged from the second gas supply pipeline 7 connected to the terminal gas-liquid heat exchange module 2.

[0106] By controlling that the liquid supply module 1 is only connected to the initial gas-liquid heat exchange module 2 and making the connecting pipeline 4 communicate with adjacent gas-liquid heat exchange modules 2, so that multiple groups of gas-liquid heat exchange modules 2 are connected in series. Control the liquid supply module 1 to output LNG and transport it to the initial gas-liquid heat exchange module 2 and the methane supply module 5. The methane supply module 5 generates heated methane for heat exchange with LNG to complete vaporization. Output part of the vaporized LNG to the required supply pipeline (such as the first gas supply pipeline 6), and perform step-by-step heat exchange and temperature rise on the other part of the vaporized LNG, and finally discharge it from the second gas supply pipeline 7 connected to the terminal gas-liquid heat exchange module 2. It can realize the step-by-step heat exchange and temperature rise of LNG, accurately control the temperature of the vaporized LNG to meet the diverse requirements of different ship equipment for gas temperature. At the same time, improve the energy utilization efficiency, reduce energy consumption and costs through cyclic heating and waste heat utilization, reduce the thermal stress of the equipment to extend the equipment life, and enhance the system reliability.

[0107] When the heat exchange process is in the parallel heat exchange mode, it specifically includes the following steps:

[0108] Control the liquid supply module 1 to be connected to multiple groups of gas-liquid heat exchange modules 2 and disconnect the connecting pipeline 4 to make adjacent two groups of gas-liquid heat exchange modules 2 operate in parallel;

[0109] Control the liquid supply module 1 to output LNG and simultaneously transport the LNG to multiple groups of gas-liquid heat exchange modules 2 and the methane supply module 5 through the liquid supply pipeline 3;

[0110] The methane supply module 5 generates heated methane through the LNG input by the liquid supply pipeline 3 and inputs the heated methane into the corresponding gas-liquid heat exchange module 2 for heat exchange with LNG to complete the vaporization of LNG;

[0111] The vaporized LNG returns to the required first gas supply pipeline 6 through the bypass pipe 11 to complete the large-scale supply of the vaporized LNG.

[0112] By controlling the connection and disconnection of the liquid supply module 1 and the multi-group gas-liquid heat exchange modules 2 through the pipeline 4, the adjacent gas-liquid heat exchange modules 2 operate in parallel. Control the liquid supply module 1 to output LNG and simultaneously transport it to the multi-group gas-liquid heat exchange modules 2 and the methane supply module 5. The methane supply module 5 generates heated methane for heat exchange with LNG to complete gasification. Then, the gasified LNG flows back to the first gas supply pipeline 6 through the bypass pipe 11, enabling the multi-group gas-liquid heat exchange modules 2 to simultaneously gasify LNG, thereby quickly completing the large-scale supply of gasified LNG, meeting the scenarios with high demand for gas volume during the startup and acceleration of the ship, etc. Moreover, the parallel connection of the multi-group gas-liquid heat exchange modules 2 has a certain redundancy, enhancing the reliability of the system and the ability to cope with instantaneous high-load demands.

[0113] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A ship-based LNG gasification heat exchange system, characterized in that: include: Liquid supply module, used to output LNG; Multiple groups of gas-liquid heat exchange modules are selectively connected to the liquid supply module through a liquid supply pipeline, so that two adjacent groups of gas-liquid heat exchange modules can be connected in parallel, and have heating methane for heat exchange with LNG inside; A connecting pipeline is provided between two adjacent groups of the gas-liquid heat exchange modules, and is used to control the connection or disconnection of the two adjacent groups of the gas-liquid heat exchange modules; When the connecting pipeline is connected to two adjacent groups of the gas-liquid heat exchange modules, the two adjacent groups of the gas-liquid heat exchange modules are connected in series to transfer the gasified LNG and enable the gasified LNG to be heated by step-by-step heat exchange; a methane supply module connected to the corresponding gas-liquid heat exchange module and the liquid supply pipeline, for receiving the LNG input from the liquid supply pipeline, generating the heated methane through the LNG, and supplying the heated methane to the gas-liquid heat exchange module; The gas-liquid heat exchange module comprises a heat exchange cavity having a liquid inlet, a liquid outlet, an air inlet and an air outlet; The methane supply module is connected to the air inlet and the liquid outlet corresponding to the heat exchange cavity to form a circulation loop; The methane supply module is used to heat the LNG input from the liquid supply pipeline and the ungasified LNG output from the liquid outlet to form the heated methane, and input it into the heat exchange cavity.

2. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: The liquid inlet and the gas outlet are arranged on the top of the heat exchange cavity; The liquid outlet and the air inlet are arranged at the bottom of the heat exchange cavity.

3. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: The gas-liquid heat exchange module also includes a liquid distributor and a gas distribution pipe; The liquid distributor and the air distribution pipe are respectively connected to the air inlet and the liquid inlet.

4. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: The methane supply module comprises a circulation heating pipe and a first electromagnetic heater, both ends of which are respectively connected to the air inlet and the liquid outlet; The first electromagnetic heater is arranged in the middle of the circulating heating tube to provide temperature for the generation of the heated methane.

5. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: The gas-liquid heat exchange module is a supergravity rotating heat exchange bed and has a built-in rotor structure for increasing the specific surface area of ​​the LNG in contact with the heated methane.

6. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: The gasified LNG output ends of the gas-liquid heat exchange modules at the middle and end of the plurality of connecting pipelines are respectively connected to the first gas supply pipeline and the second gas supply pipeline; The first air supply pipeline is used for pressurizing the tank and cleaning the pipeline or the tank respectively; The second air supply pipeline is used for supplying fuel to the cabin engine.

7. The ship-based LNG gasification heat exchange system according to claim 6, characterized in that: The second gas supply pipeline includes a normal temperature gas supply pipeline and a high temperature gas supply pipeline, which are respectively used to provide fuel to the cabin engine under different working conditions; The high-temperature gas supply pipeline is provided with a second electromagnetic heater for reheating the gasified LNG output by the gas-liquid heat exchange module at the end.

8. The ship-based LNG gasification heat exchange system according to claim 6, characterized in that: The second air supply pipeline and the first air supply pipeline, as well as two adjacent first air supply pipelines, are connected via a bypass pipe; When two adjacent groups of the gas-liquid heat exchange modules are connected in parallel, the LNG output by the liquid supply pipeline can pass through multiple groups of the gas-liquid heat exchange modules and flow back to the first gas supply pipeline for large-scale supply of gasified LNG.

9. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: It also includes a wind tube power generation module and an energy storage module; The input end of the energy storage module is connected to the wind tube power generation module, and the output end is connected to the gas-liquid heat exchange module and the methane supply module for providing energy.

10. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: Also included is a liquid supply regulation module; The liquid supply regulating module is connected to the liquid supply pipeline and the methane supply module, and is used to regulate the amount of LNG gas provided to the gas-liquid heat exchange module and the methane supply module according to a flow monitoring component arranged on the liquid supply pipeline.

11. A heat exchange process based on ship LNG gasification, characterized in that: The method is implemented by using a ship-based LNG gasification heat exchange system as described in any one of claims 1 to 10, wherein the heat exchange process includes two modes: series heat exchange and parallel heat exchange, which are used for conventional gas supply and large-scale gas supply of LNG respectively.

12. The heat exchange process based on ship LNG gasification according to claim 11, characterized in that: When the heat exchange process is in a series heat exchange mode, it specifically includes the following steps: Control the liquid supply module to be connected only to the initial gas-liquid heat exchange module, and make the connecting pipeline communicate with two adjacent groups of gas-liquid heat exchange modules, so that the two adjacent groups of gas-liquid heat exchange modules are connected in series; Control the liquid supply module to output LNG, and transport the LNG to the initial gas-liquid heat exchange module and the methane supply module through the liquid supply pipeline; The methane supply module generates heated methane through the LNG input through the liquid supply pipeline, and inputs the heated methane into the initial gas-liquid heat exchange module to perform heat exchange with the LNG to complete the gasification of the LNG; A portion of the gasified LNG is output from the first gas supply pipeline connected to the connecting pipeline to the required supply pipeline, and another portion of the gasified LNG is output to the next gas-liquid heat exchange module for step-by-step heat exchange and temperature increase until the gasified LNG circulates to the second gas supply pipeline connected to the terminal gas-liquid heat exchange module and is discharged.

13. The heat exchange process based on ship LNG gasification according to claim 11, characterized in that: When the heat exchange process is in the parallel heat exchange mode, it specifically includes the following steps: Control the liquid supply module to be connected to multiple groups of gas-liquid heat exchange modules, and disconnect the connecting pipelines so that two adjacent groups of gas-liquid heat exchange modules can operate in parallel; Control the liquid supply module to output LNG, and simultaneously transport LNG to multiple groups of gas-liquid heat exchange modules and methane supply modules through the liquid supply pipeline; The methane supply module generates heated methane through the LNG input through the liquid supply pipeline, and inputs the heated methane into the corresponding gas-liquid heat exchange module to perform heat exchange with the LNG to complete the gasification of the LNG; The gasified LNG is refluxed to the required first gas supply pipeline through the bypass pipe, thereby completing the large-scale supply of the gasified LNG.

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