LNG gas gasification heat exchange system based on ship and heat exchange process of LNG gas gasification heat exchange system

Abstract

The invention discloses a ship-based LNG gas gasification heat exchange system and a heat exchange process thereof, and the system comprises a liquid supply module used for outputting LNG; the gas-liquid heat exchange modules selectively communicate with the liquid supply module through liquid supply pipelines, and heating methane used for exchanging heat with LNG is arranged in the gas-liquid heat exchange modules; the connecting pipeline is arranged between two adjacent groups of gas-liquid heat exchange modules; when the connecting pipeline communicates with the two adjacent gas-liquid heat exchange modules, the two adjacent gas-liquid heat exchange modules are connected in series. And the methane supply module is connected with the corresponding gas-liquid heat exchange module and the liquid supply pipeline. By means of the arrangement, efficient LNG heat exchange is completed, meanwhile, the size and the occupied area of equipment can be effectively reduced, gas supply requirements of different equipment for gasified LNG can be met, flexible supply of the gasified LNG is achieved, resources on a ship can be fully utilized, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the field of ship liquefied gas storage and gasification, and in particular to a ship LNG gasification heat exchange system and a heat exchange process thereof. Background Art

[0002] As the global shipping industry is booming, energy transformation has become a key issue for the sustainable development of the industry. With its significant advantages of cleanliness, environmental protection and high energy density, liquefied natural gas (LNG) is increasingly used in the field of ship fuel. With the deep penetration of LNG in the shipping industry, efficient LNG gasification technology has become a core element to ensure the stable operation of ships and reduce operating costs.

[0003] In the existing LNG gasification technology system, traditional heat exchange gasification equipment has exposed many drawbacks. The specific drawbacks are as follows: First, from the perspective of equipment structure and cost, the common liquid-liquid (such as ethylene glycol water 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 greatly increases the size of the equipment, which is often more than ten meters long, not only occupying a lot of valuable space on the ship, but also causing the equipment cost to remain high, bringing an economic burden to the ship operator.

[0004] Secondly, from the perspective of energy consumption, in order to maintain a large gas and liquid flow cycle, such as absorbing cold air, ethylene glycol solution, seawater, and heating steam, a large amount of electricity or fuel is required to provide power. In addition, in order to build and maintain these circulation systems, a series of auxiliary equipment is required, such as ethylene glycol solution circulation pumps, seawater pumps, solution storage tanks, solution steam heating heat exchangers, etc., which further aggravates energy consumption and equipment complexity.

[0005] Finally, from the perspective of gas supply flexibility, traditional gasification equipment is difficult to meet the diverse requirements of different equipment on ships for methane gas 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 different requirements for the temperature and flow rate of fuel gas. Traditional gasification equipment cannot accurately adjust the gas supply temperature, and it is difficult to achieve a set of process equipment to provide gas in multiple temperature ranges, resulting in low energy utilization efficiency and failure to give full play to the advantages of LNG as a high-quality fuel.

[0006] Therefore, a ship LNG gasification heat exchange system and a heat exchange process thereof are needed to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a ship-based LNG gasification heat exchange system and a heat exchange process thereof, so as to achieve efficient LNG heat exchange while effectively reducing the size and floor space of the equipment, and also being compatible with the gas supply requirements of different equipment for gasified LNG to achieve flexible supply of gasified LNG, and also being able to make full use of the resources on the ship to achieve the purpose of energy conservation and emission reduction.

[0008] In order to solve the above technical problems, the present invention provides a ship LNG gasification heat exchange system, comprising: 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, so that the gasified LNG can be heated by step-by-step heat exchange; The methane supply module is connected to the corresponding gas-liquid heat exchange module and the liquid supply pipeline, and is used to receive the LNG input from the liquid supply pipeline, generate the heated methane through the LNG, and supply it to the gas-liquid heat exchange module.

[0009] Furthermore, 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.

[0010] Furthermore, the liquid inlet and the gas outlet are arranged at the top of the heat exchange cavity; The liquid outlet and the air inlet are arranged at the bottom of the heat exchange cavity.

[0011] Furthermore, 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.

[0012] Furthermore, 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.

[0013] Furthermore, 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.

[0014] Furthermore, 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.

[0015] Furthermore, 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.

[0016] Furthermore, 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.

[0017] Furthermore, 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.

[0018] Furthermore, it also includes a liquid supply regulating 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.

[0019] On the other hand, the present invention also proposes a heat exchange process based on ship LNG gasification, wherein the heat exchange process includes two modes: series heat exchange and parallel heat exchange, which are respectively used for conventional gas supply and large-scale gas supply of LNG.

[0020] Furthermore, 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.

[0021] Furthermore, when the heat exchange process is in a parallel heat exchange mode, it specifically includes the following steps: Control the liquid supply module to connect with 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.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects: 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 with the gas-liquid heat exchange module and the methane supply module, and connecting the methane supply module with 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 the hot energy of LNG are directly contacted for heat exchange, and there is no need to introduce additional heat exchange medium. Therefore, compared with the method of using other media for heat exchange in the prior art, direct contact heat exchange can effectively improve the heat exchange rate, and can effectively avoid the energy consumption required for heating or cooling the additional medium, 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, to achieve efficient heat exchange of LNG while reducing the equipment volume and the space occupied.

[0023] In addition, by selectively connecting the liquid supply module with multiple groups of gas-liquid heat exchange modules through liquid supply pipelines, and setting connected or disconnected connecting pipelines between two adjacent groups of gas-liquid heat exchange modules, multiple groups of gas-liquid heat exchange modules can be connected in parallel or in series. Therefore, the system can flexibly adjust the operating mode according to the actual gas demand of the ship, such as realizing large-scale gas supply in parallel and accurately controlling the gas temperature in series to meet the gas supply application requirements of different working conditions.

[0024] In addition, through the modular design of multiple groups of gas-liquid heat exchange modules, when an 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, thereby ensuring continuous gas supply to the system and improving reliability and stability. Moreover, since each component is relatively independent, it is easy to maintain and overhaul. In addition, if the gas supply capacity needs to be increased, it is only necessary to increase the number of gas-liquid heat exchange modules, which has good scalability.

[0025] Furthermore, by setting up 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, an air inlet and an air outlet, and making the two ends of the circulating heating pipe connected to the air inlet and the liquid outlet respectively to form a circulation loop, the first electromagnetic heater can heat the LNG input by the liquid supply pipeline and the ungasified LNG output by the liquid outlet to form heated methane, and exchange heat with the LNG until the gasified LNG is discharged from the air outlet. This circulating heating method can recycle the heat in the ungasified LNG, reduce additional energy input, and reduce energy consumption.

[0026] Furthermore, by setting up a wind tube power generation module and an energy storage module, and connecting the energy storage module with the gas-liquid heat exchange module and the methane supply module. Since the ship will generate continuous wind power during navigation, the wind tube power generation module can convert this part of wind energy into electrical energy, while 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 operating costs of the ship, and achieves the purpose of energy conservation and emission reduction.

[0027] Furthermore, a liquid supply regulating module is provided, and the liquid supply regulating module can adjust the amount of LNG 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, for example, under different working conditions such as starting, acceleration, and cruising, when the system has different requirements for the amount and temperature of gasified LNG, the liquid supply regulating module can respond in time and provide a suitable amount of LNG to ensure efficient gasification of the gas-liquid heat exchange module and meet the supply demand, that is, the system always maintains the best operating state to avoid LNG waste or insufficient supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a ship LNG gasification heat exchange system according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the partial structure of a ship LNG gasification heat exchange system in one embodiment of the present invention.

[0029] Figure numbers: 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. Connecting 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 duct power generation module; 9. Energy storage module; 10. Liquid supply adjustment module; 11. Bypass pipe. DETAILED DESCRIPTION

[0030] The following will be described in more detail with reference to the schematic diagram of the ship LNG gasification heat exchange system and the heat exchange process thereof, wherein the preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described herein, while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0031] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown, the embodiment of the present invention proposes a ship LNG gasification heat exchange system, including: The liquid supply module 1 is used to output LNG.

[0034] Multiple groups of gas-liquid heat exchange modules 2 are selectively connected to the liquid supply module 1 through the liquid supply pipeline 3, so that two adjacent groups of gas-liquid heat exchange modules 2 can be connected in parallel, and have heating methane for heat exchange with LNG inside.

[0035] It should be noted that heated methane and LNG are different states of the same medium, namely, gaseous state and liquid state. Therefore, in this embodiment, by using heated methane as the heat exchange medium of LNG, it is not necessary to input additional medium for heat exchange. Compared with the method of using different media for heat exchange in the prior art, this method does not need to be equipped with a large heat exchange area, so that the size of the equipment can be greatly reduced, and the space utilization rate can be improved while reducing the equipment cost. In addition, this method can also achieve direct contact between heated methane and LNG, which can effectively improve the heat exchange rate compared with the method of indirect contact of different media through auxiliary pipelines in the prior art. Therefore, this system can achieve the purpose of completing efficient heat exchange of LNG while effectively reducing the volume and floor space of the equipment.

[0036] The connecting pipeline 4 is arranged between two adjacent groups of the gas-liquid heat exchange modules 2 and is used to control the connection or disconnection of the two adjacent groups of the gas-liquid heat exchange modules 2.

[0037] When the connecting pipeline 4 is connected to two adjacent groups of the gas-liquid heat exchange modules 2, the two adjacent groups of the gas-liquid heat exchange modules 2 are connected in series to transfer the gasified LNG so that the gasified LNG can be heated by step-by-step heat exchange.

[0038] Therefore, in conjunction with the above-mentioned method of selectively connecting multiple groups of gas-liquid heat exchange modules 2 with the liquid supply module 1 through the liquid supply pipeline 3, the system can switch modes according to needs (such as controlling multiple groups of gas-liquid heat exchange modules 2 in series or in parallel), thereby meeting application needs in different scenarios.

[0039] In a specific example, when LNG needs to be heated up in steps to meet the supply requirements of different equipment for gasified LNG at different intervals of temperature. The system can connect multiple groups of gas-liquid heat exchange modules 2 in sequence through the connecting pipeline 4, and make the liquid supply module 1 only connected to the initial gas-liquid heat exchange module 2, and then LNG will pass through the gas-liquid heat exchange module 2 in sequence for heat exchange and gasification, and the gasified LNG can enter the next gas-liquid heat exchange module 2 step by step, realizing the function of step-by-step heating. Then, a branch can be set in the middle of the connecting pipeline 4 so that the gasified LNG between the two groups of gas-liquid heat exchange modules 2 can be output to the designated equipment, so as to meet the supply requirements of different equipment for gasified LNG at different intervals of temperature.

[0040] In another specific example, when a large amount of low-temperature LNG gas 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 with the liquid supply module 1, so that multiple groups of gas-liquid heat exchange modules 2 can simultaneously heat exchange and gasify LNG to meet the above application requirements.

[0041] In summary, this system can flexibly adjust the operating mode according to the actual gas demand of the ship, such as realizing large-scale gas supply in parallel and accurately controlling the gas temperature in series, effectively meeting the gas supply application requirements under different working conditions.

[0042] 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, thereby ensuring continuous gas supply to the system and improving reliability and stability. Moreover, since the various components are relatively independent, it is also easy to maintain and overhaul. In addition, if the gas supply capacity needs to be increased, it is only necessary to increase the number of gas-liquid heat exchange modules 2, which has good scalability.

[0043] 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 from 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 gasified 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, so as to output the gasified LNG.

[0044] It should be particularly noted that the gasified LNG outputted from the gas-liquid heat exchange module 2 includes heated methane and gasified LNG formed after heat exchange between a portion of LNG and the heated methane.

[0045] In a further embodiment, the gas-liquid heat exchange module 2 is further limited to enhance the heat exchange gasification effect of LNG.

[0046] Specifically, the gas-liquid heat exchange module 2 includes a heat exchange cavity 21 having a liquid inlet, a liquid outlet, an air inlet, and an air outlet.

[0047] The methane supply module 5 is connected to the air inlet and the liquid outlet of the corresponding heat exchange cavity 21 to form a circulation loop. The methane supply module 5 can heat the LNG input from the liquid supply pipeline 3 and the ungasified LNG output from the liquid outlet to form the heated methane, and input it into the heat exchange cavity 21. That is, the ungasified LNG flows back to the methane supply module 5 through the liquid outlet, and is mixed with the fresh LNG input from the liquid supply pipeline 3 and heated again. This circulation heating method can recycle the heat in the ungasified LNG, reduce the additional energy input, reduce energy consumption, and increase the LNG gasification rate by more than 30%.

[0048] It should be 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 heated methane to enter from the bottom gas inlet and LNG to be ejected from the top liquid inlet, countercurrent contact can be formed, thereby effectively extending the gas-liquid contact time, improving the mass transfer efficiency, and increasing the heat exchange area utilization by 50%, thereby achieving the purpose of further improving the heat exchange effect.

[0049] In other embodiments, the gas-liquid heat exchange module 2 further includes a liquid distributor 22 and an air distribution pipe 23, and the liquid distributor 22 and the air distribution pipe 23 are respectively connected to the air inlet and the liquid inlet. By providing the liquid distributor 22 and the air distribution pipe 23, the LNG and the heated methane are evenly distributed in the heat exchange chamber, avoiding local overheating or overcooling, making the entire heat exchange process more balanced, improving the heat exchange quality, and achieving the purpose of improving the uniformity of heat exchange. It can also increase the contact area between LNG and heated methane, accelerate the gasification speed of LNG, significantly improve the heat and mass transfer efficiency, and achieve the purpose of improving the working efficiency of the gas-liquid heat exchange module 2.

[0050] In this embodiment, the methane supply module 5 includes a circulating heating pipe 51 and a first electromagnetic heater 52, both ends of which are connected to the gas inlet and the liquid outlet respectively. The first electromagnetic heater 52 is arranged in the middle of the circulating heating pipe 51 to provide temperature for the generation of the heated methane. By arranging the circulating 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 ungasified LNG refluxed from the liquid outlet, and the first electromagnetic heater 52 provides temperature heating to form heated methane, which is then transported to the heat exchange cavity 21 through the circulating heating pipe 51, thereby ensuring that the gas-liquid heat exchange module 2 continuously obtains a stable heat source and improves the LNG gasification efficiency.

[0051] In other embodiments, in order to further improve the working efficiency of the gas-liquid heat exchange module 2, the gas-liquid heat exchange module 2 is configured as a supergravity rotating heat exchange bed, and a rotor structure is built in to increase the specific surface area of ​​contact between LNG and the heated methane, thereby effectively enhancing the heat and mass transfer process to accelerate the gasification rate of LNG, significantly improving the working efficiency of the gas-liquid heat exchange module 2, and providing ships with a more efficient supply of gasified LNG.

[0052] In other embodiments, in order to facilitate the output of the 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 the gasified LNG.

[0053] Specifically, the gasified LNG output ends of the gas-liquid heat exchange modules 2 at the middle and end portions of the plurality of connecting pipelines 4 are respectively connected to the first gas supply pipeline 6 and the second gas supply pipeline 7 .

[0054] The first air supply pipeline 6 is used for pressurizing the tank and cleaning the pipeline or the tank.

[0055] The second air supply pipeline 7 is used for supplying fuel to the cabin engine.

[0056] It should be noted that the gasified LNG outputted from the first gas supply pipeline 6 is low-temperature gas, while the gasified LNG outputted from the second gas supply pipeline 7 is high-temperature gas.

[0057] In a further embodiment, the second air supply pipeline 7 includes a normal temperature air supply pipeline 71 and a high temperature air supply pipeline 72, which are respectively used to provide fuel to the cabin engine under different working conditions.

[0058] The high-temperature gas supply pipeline 72 is provided with a second electromagnetic heater 721 for reheating the gasified LNG outputted by the gas-liquid heat exchange module 2 at the end.

[0059] In other embodiments, in order to realize centralized supply of gasified LNG when multiple groups of gas-liquid heat exchange modules 2 are connected in parallel, a bypass pipe 11 is further provided to connect multiple first gas supply pipelines 6 and second gas supply pipelines 7 .

[0060] Specifically, the second air supply pipeline 7 and the first air supply pipeline 6 as well as two adjacent first air supply pipelines 6 are connected via a bypass pipe 11 .

[0061] When two adjacent groups of the gas-liquid heat exchange modules 2 are connected in parallel, the LNG output by the liquid supply pipeline 3 can pass through multiple groups of the gas-liquid heat exchange modules 2 and flow back to the first gas supply pipeline 6 for large-scale supply of gasified LNG.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 .

[0068] Furthermore, a ship-based LNG gasification heat exchange system also includes a liquid supply regulating module 10.

[0069] The liquid supply regulating module 10 is connected to the liquid supply pipeline 3 and the methane supply module 5, and is used to regulate the amount of LNG gas provided to the gas-liquid heat exchange module 2 and the methane supply module 5 according to a flow monitoring component (not numbered in the figure) arranged on the liquid supply pipeline 3.

[0070] By setting up the liquid supply regulating module 10, when the gas demand of the ship changes, for example, under different operating conditions such as starting, acceleration, cruising, etc., when the system has different requirements for the amount and temperature of gasified LNG, the liquid supply regulating module 10 can respond in time and provide a suitable amount of LNG to ensure efficient gasification of the gas-liquid heat exchange module 2 and meet the supply demand, so that the system can always maintain the best operating state and avoid LNG waste or insufficient supply.

[0071] Example 2

[0072] On the other hand, the present invention also proposes a heat exchange process based on the gasification of ship LNG gas, and the heat exchange process includes two modes of series heat exchange and parallel heat exchange, which are used for conventional gas supply and large-scale gas supply of LNG respectively. That is, the series or parallel mode can be flexibly switched according to demand. For example, in the series mode, LNG can be heated up in steps to meet the supply requirements of different equipment for gasified LNG at different temperature intervals. In the parallel mode, multiple groups of gas-liquid heat exchange modules 2 can simultaneously heat and gasify LNG to meet the demand for large-scale low-temperature LNG gas supply. For example, when the ship is started or needs to quickly replenish gas, the parallel mode can quickly provide sufficient gas volume. Therefore, this flexible mode switching capability enables the system to adapt to the gas demand of the ship under different working conditions, whether it is conventional navigation, acceleration, deceleration or docking, etc., it can ensure stable and efficient gas supply, and enhance the overall adaptability and reliability of the system.

[0073] Wherein, when the heat exchange process is in the series heat exchange mode, it specifically includes the following steps: Control the liquid supply module 1 to be connected only to the initial gas-liquid heat exchange module 2, and make the connecting pipeline 4 connect two adjacent groups of gas-liquid heat exchange modules 2, so that the two adjacent groups of gas-liquid heat exchange modules 2 are connected in series; Control the liquid supply module 1 to output LNG, and transport the LNG to the initial gas-liquid heat exchange module 2 and the methane supply module 5 through the liquid supply pipeline 3; The methane supply module 5 generates heated methane through the LNG inputted 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 gasification of the LNG; A portion of the gasified LNG is output from the first gas supply pipeline 6 connected to the connecting pipeline 4 to the required supply pipeline, and another portion of the gasified LNG is output to the next gas-liquid heat exchange module 2 for step-by-step heat exchange and heating until the gasified LNG circulates to the second gas supply pipeline 7 connected to the terminal gas-liquid heat exchange module 2 and is discharged.

[0074] By controlling the liquid supply module 1 to be connected only to the initial gas-liquid heat exchange module 2 and making the connecting pipeline 4 connect to the adjacent gas-liquid heat exchange module 2, so that multiple groups of gas-liquid heat exchange modules 2 are connected in series, the liquid supply module 1 is controlled to output LNG and transport it to the initial gas-liquid heat exchange module 2 and the methane supply module 5, and the methane supply module 5 generates heated methane and heat exchanges with LNG to complete gasification, and outputs part of the gasified LNG to the required supply pipeline (such as the first gas supply pipeline 6), and the other part of the gasified LNG is subjected to stepwise heat exchange and temperature rise, and finally discharged from the second gas supply pipeline 7 connected to the terminal gas-liquid heat exchange module 2. It can realize the stepwise heat exchange and temperature rise of LNG, accurately control the temperature of gasified LNG to meet the diverse requirements of different equipment on the gas temperature of the ship, and at the same time improve the energy utilization efficiency, reduce energy consumption and cost through cyclic heating and waste heat utilization, reduce equipment thermal stress to extend equipment life, and enhance system reliability.

[0075] When the heat exchange process is in the parallel heat exchange mode, it specifically includes the following steps: 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, so that two adjacent groups of gas-liquid heat exchange modules 2 can operate in parallel; Control the liquid supply module 1 to output LNG, and simultaneously deliver the LNG to multiple groups of gas-liquid heat exchange modules 2 and methane supply module 5 through the liquid supply pipeline 3; The methane supply module 5 generates heated methane through the LNG inputted from the liquid supply pipeline 3, and inputs the heated methane into the corresponding gas-liquid heat exchange module 2 to perform heat exchange with the LNG to complete the gasification of the LNG; The gasified LNG flows back to the required first gas supply pipeline 6 through the bypass pipe 11, thereby completing the large-scale supply of the gasified LNG.

[0076] By controlling the liquid supply module 1 to connect and disconnect the connecting pipeline 4 with multiple groups of gas-liquid heat exchange modules 2, adjacent gas-liquid heat exchange modules 2 are operated in parallel, and the liquid supply module 1 is controlled to output LNG and simultaneously transport it to the multiple groups of gas-liquid heat exchange modules 2 and the methane supply module 5. The methane supply module 5 generates heated methane and exchanges heat with LNG to complete gasification, and then the gasified LNG is returned to the first gas supply pipeline 6 through the bypass pipe 11, so that the multiple groups of gas-liquid heat exchange modules 2 can gasify LNG at the same time, and then quickly complete the large-scale supply of gasified LNG, meeting the scene of large gas demand under starting, acceleration and other working conditions of the ship, and the multiple groups of gas-liquid heat exchange modules 2 have a certain redundancy in parallel, which improves the reliability of the system and the ability to cope with instantaneous high load demand.

[0077] Obviously, those skilled in the art can make various changes and modifications 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 equivalents, 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; The methane supply module is connected to the corresponding gas-liquid heat exchange module and the liquid supply pipeline, and is used to receive the LNG input from the liquid supply pipeline, generate the heated methane through the LNG, and supply it to the gas-liquid heat exchange module.

2. The ship-based LNG gasification heat exchange system according to claim 1, characterized in that: 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.

3. The ship-based LNG gasification heat exchange system according to claim 2, 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.

4. The ship-based LNG gasification heat exchange system according to claim 2, 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.

5. The ship-based LNG gasification heat exchange system according to claim 2, 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.

6. The ship-based LNG gasification heat exchange system according to claim 1 or 2, 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.

7. 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.

8. The ship-based LNG gasification heat exchange system according to claim 7, 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.

9. The ship-based LNG gasification heat exchange system according to claim 7, 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.

10. 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.

11. 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.

12. A heat exchange process based on ship LNG gasification, characterized in that: It comprises a ship-based LNG gasification heat exchange system as described in any one of claims 1 to 11; The heat exchange process includes two modes: series heat exchange and parallel heat exchange, which are respectively used for conventional gas supply and large-scale gas supply of LNG.

13. The heat exchange process based on ship LNG gasification according to claim 12, 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.

14. The heat exchange process based on ship LNG gasification according to claim 12, 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.

Images