Multifunctional LNG cylinder with heat supercharging and cold output

Abstract

This application relates to a multifunctional LNG cylinder with thermal pressurization and cooling output, belonging to the technical field of LNG cylinders. It includes an outer shell and an inner liner, with the inner liner located inside the outer shell. A vacuum jacket is formed between the outer shell and the inner liner. An internal tube is located on the outer side wall of the bottom of the inner liner, through which a working fluid flows and provides heat exchange. A front circulation pipe and a rear circulation pipe are located at both ends of the internal tube. One end of each pipe is located within the vacuum jacket, while the other end extends out of the outer shell and is sequentially connected to a circulating pump and a water bath vaporizer. The output end of the water bath vaporizer is connected to the rear circulation pipe. This application forms a closed-loop phase-change heat exchange system through the internal tube, the front circulation pipe, the circulating pump, the water bath vaporizer, and the rear circulation pipe. The internal tube performs the heat exchange function. This system has dual hot and cold loops. The hot loop controls the stable increase of pressure within the cylinder, ensuring pressure balance within the inner liner; the cold loop controls the cylinder to achieve cooling output, demonstrating high application value.

Description

Technical Field

[0001] This application relates to the field of LNG cylinders, and more particularly to a multifunctional LNG cylinder with thermal pressurization and cooling output. Background Technology

[0002] With the rapid development of the natural gas industry, the use of liquefied natural gas (LNG) as a vehicle fuel has also seen rapid growth. LNG is obtained by liquefying gaseous natural gas through cryogenic processing. It is an ultra-low temperature energy-carrying liquid and is stored in cryogenic cylinders. It must be vaporized to be utilized in gaseous form. Because LNG's temperature is -162℃, a large amount of cold energy is generated during the vaporization process. If this energy is not recovered, it will result in significant energy waste.

[0003] LNG cylinders have a double-layer structure. The inner liner stores liquid LNG and is made of cryogenic alloy steel. The outer shell serves as a protective layer for the inner liner, maintaining a certain distance to form an insulated space. This outer shell bears the weight load of the inner liner and the LNG, as well as the vacuum pressure of the insulation layer. The outer shell does not come into contact with the cryogenic temperature. When a vehicle is initially refueled, the newly added LNG is a subcooled liquid, and the pressure of the evaporated gas is insufficient to meet the pressure requirements for delivery to the generator. Therefore, a pressurization system is required.

[0004] Currently, the most commonly used gas cylinder pressurization system is the self-pressurization system, which uses the temperature difference between LNG and air to exchange heat in ambient temperature finned tubes. When the gas cylinder volume is small, it can basically meet the needs. However, when the gas cylinder volume increases several times, firstly, the heat exchange capacity is small and the pressurization time is long, and secondly, the power for pressurization is the static pressure difference of the liquid. The pressure difference at low liquid levels is too small to pressurize, and the residual liquid increases, resulting in a shorter driving range. There is a strong demand for improvement in this area within the industry. Summary of the Invention

[0005] To prevent insufficient LNG supply due to low gas pressure caused by the evaporation of supercooled liquid in LNG cylinders, which would affect engine power performance, this application provides a multifunctional LNG cylinder with thermal boosting and cold energy recovery.

[0006] This application provides a multifunctional LNG cylinder with thermal pressurization and cooling output, which adopts the following technical solution:

[0007] A multifunctional LNG cylinder with thermal pressurization and cooling output includes an outer shell and an inner liner. The inner liner is located inside the outer shell, and a vacuum jacket is formed between the outer shell and the inner liner. An internal tube is provided on the bottom outer wall of the inner liner. The internal tube carries a working fluid and has a heat exchange function. A front circulation pipe and a rear circulation pipe are provided at both ends of the internal tube. One end of the front circulation pipe and the rear circulation pipe are located in the vacuum jacket, and the other end extends out of the outer shell and is sequentially connected to a circulation pump pool and a water bath vaporizer. The output end of the water bath vaporizer is connected to the rear circulation pipe. A shut-off valve one is provided on the front circulation pipe, and a shut-off valve two is provided on the rear circulation pipe.

[0008] By adopting the above technical solution, the built-in pipe, together with the front circulation pipe, circulation pump pool, water bath vaporizer, and rear circulation pipe, forms a closed-loop phase change heat exchange system, in which the working fluid can circulate. When the pressure in the gas phase space inside the inner tank is insufficient, the circulation pump pool starts after receiving a control signal, creating a pressure difference and promoting closed-loop flow. During this process, the liquid working fluid is vaporized after being heated by the water bath vaporizer to form a gaseous working fluid. The gaseous working fluid enters the built-in pipe through the rear circulation pipe and exchanges heat with the built-in pipe, causing the temperature of the built-in pipe to rise. At the same time, the gaseous working fluid condenses to form a liquid working fluid and flows back to the front circulation pipe to await heating. Subsequently, the built-in pipe exchanges heat with the bottom space of the vacuum jacket, causing the temperature at the bottom of the inner tank to rise. The inner tank then exchanges heat with the liquid LNG inside, causing the liquid LNG to continuously vaporize. The large amount of heat input saturates the liquid working fluid. When the pressure inside the inner tank reaches the preset value, the shut-off valve two automatically closes. By controlling the pressure increase inside the gas cylinder through this closed-loop phase change heat transfer system, the pressure inside the cylinder is kept relatively balanced, thereby ensuring that the LNG cylinder can provide the engine with NG gas at a stable pressure, thus ensuring the engine's power performance.

[0009] Optionally, the water inlet of the water bath carburetor is connected to the water outlet of the engine cooling water system, and the water outlet of the water bath carburetor is connected to the water inlet of the engine cooling water system.

[0010] By adopting the above technical solution, the hot water discharged from the engine cooling water system is introduced into the water bath carburetor. By borrowing energy, the waste heat of the engine cooling water is recovered, the energy efficiency ratio is improved, and after the hot water exchanges heat with the liquid working fluid, the water temperature decreases and flows back to the engine cooling water system while the working fluid is vaporized, thus realizing water circulation between the water bath carburetor and the engine cooling water system.

[0011] Optionally, the connecting pipe is equipped with a three-way control valve, the three-way control valve is connected to a cooling pipe, the end of the cooling pipe away from the three-way control valve is connected to the rear circulation pipe, and a refrigeration device is connected to the cooling pipe.

[0012] By adopting the above technical solution, a three-way control valve connects the water bath vaporizer and the refrigeration unit in parallel, forming a dual-loop system (hot and cold) based on the circulating pump tank. When not in operation, the three-way control valve remains closed, and neither the hot nor cold phases operate. When the three-way control valve is controlled to allow the working fluid to flow back through the water bath vaporizer to the internal pipe, the gas cylinder undergoes thermal pressurization. When the three-way control valve is controlled to allow the working fluid to flow back through the refrigeration unit to the internal pipe, heat exchange between the liquid LNG and the working fluid is achieved through the internal pipe, lowering the working fluid's temperature. The cooling capacity is then output through the refrigeration unit, enabling the gas cylinder to achieve active cooling.

[0013] Optionally, a pressure sensor is also included, the sensing end of which is located in the gas phase space of the inner liner, and the pressure sensor signal is connected to a control system, which is signal connected to the circulating pump pool.

[0014] By adopting the above technical solution, the pressure sensor is used to monitor the pressure in the gas phase space of the LNG cylinder. When the actual detected pressure value is less than the preset value, the pressure sensor sends a signal to the control system. After receiving the signal, the control system sends a start control signal to the circulation pump, thereby starting the circulation pump and realizing the directional circulation of the working fluid, enabling the LNG cylinder to operate under thermal pressurization. When the pressure in the inner liner reaches the preset value, the pressure sensor sends a signal to the control system. After receiving the signal, the control system sends a stop control signal to the circulation pump, thereby stopping the circulation pump and improving control efficiency.

[0015] Optionally, the control system is signal-connected to a three-way control valve.

[0016] By adopting the above technical solution, the control system can switch the hot and cold dual circuits connected in parallel by the three-way control valve, which facilitates the switching of gas cylinders between hot pressurization and micro-energy cooling modes, and further improves control efficiency.

[0017] Optionally, in the non-operating state, the control system remains in a neutral / shutdown state, and there is no working fluid flow in any pipeline;

[0018] When the pressure value detected by the pressure sensor is less than the preset value, that is, when the gas cylinder pressure is insufficient, the control system controls the circulation pump to start and controls the three-way control valve to open the heating side valve of the connecting pipe. At this time, the connecting pipe is completely open and there is no working fluid flowing in the cooling pipe, so that the gas cylinder has the function of thermal pressurization.

[0019] When micro-powered cooling is required, the control system starts the circulating pump and opens the refrigeration side valve of the three-way control valve connected to the cooling pipe. At this time, the cooling pipe is completely open, and there is no working fluid flowing in the water bath vaporizer, so that the gas cylinder is in a micro-powered cooling state.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. A closed-loop phase-change heat exchange system is formed by the built-in pipe, the front circulation pipe, the circulation pump, the water bath vaporizer, and the rear circulation pipe, allowing the working fluid to circulate within this system. When the pressure in the gas phase space inside the inner tank is insufficient, the circulation pump starts upon receiving a control signal, creating a pressure differential and promoting closed-loop flow. During this process, the liquid working fluid vaporizes after being heated by the water bath vaporizer, forming a gaseous working fluid. This gaseous working fluid enters the built-in pipe through the rear circulation pipe and exchanges heat with it, lowering the working fluid temperature within the built-in pipe. Simultaneously, the gaseous working fluid condenses into a liquid working fluid and flows back to the front circulation pipe to await heating. Subsequently, the built-in pipe exchanges heat with the bottom space of the vacuum jacket, raising the temperature at the bottom of the inner tank. The inner tank then exchanges heat with the liquid LNG within it, causing the liquid LNG to continuously vaporize. The large input of heat saturates the liquid working fluid. When the pressure inside the inner tank reaches a preset value, shut-off valve two closes. By controlling the pressure increase inside the gas cylinder through this closed-loop phase change heat transfer system, the pressure inside the cylinder is kept relatively balanced, thereby ensuring that the LNG cylinder can provide the engine with NG gas at a stable pressure, thus ensuring the engine's power performance.

[0022] 2. By setting up a water bath vaporizer, hot water discharged from the engine cooling water system is introduced into the water bath vaporizer. By borrowing energy, the waste heat of the engine cooling water is recovered, and the energy efficiency ratio is improved. After the hot water exchanges heat with the liquid working fluid, the water temperature decreases and flows back to the engine cooling water system, realizing water circulation between the water bath vaporizer and the engine cooling water system.

[0023] 3. By setting up a three-way control valve and a cooling pipe, when the three-way control valve is controlled to allow the working fluid to flow back to the built-in pipe through the refrigeration device, the built-in pipe is used to achieve heat exchange between the liquid LNG and the working fluid, the temperature of the working fluid decreases, and then the cooling capacity is output through the refrigeration device, so that the gas cylinder can achieve the function of micro-energy cooling.

[0024] 4. Through the settings of the control system, the start and stop of the three valve ports of the three-way control valve and the circulating pump tank can be controlled: in the non-working state, the control system remains in a neutral / closed state, and there is no working fluid flow in all pipelines;

[0025] When the pressure value detected by the pressure sensor is less than the preset value, that is, when the gas cylinder pressure is insufficient, the control system controls the circulation pump to start and controls the three-way control valve to open the heating side valve of the connecting pipe. At this time, the connecting pipe is completely open and there is no working fluid flowing in the cooling pipe, so that the gas cylinder has the function of thermal pressurization.

[0026] When micro-powered cooling is required, the control system starts the circulating pump and opens the refrigeration side valve of the three-way control valve connected to the cooling pipe. At this time, the cooling pipe is completely open, and there is no working fluid flowing in the water bath vaporizer, so that the gas cylinder is in a micro-powered cooling state. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a multifunctional LNG cylinder with thermal pressurization and cooling output according to an embodiment of this application.

[0028] Figure 2 This is a schematic diagram illustrating the connection relationship between the water bath carburetor and the engine cooling water system in the embodiments of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Inner liner; 21. Internal pipe; 3. Vacuum jacket; 31. Front circulation pipe; 311. Shut-off valve one; 32. Rear circulation pipe; 321. Shut-off valve two; 4. Circulation pump pool; 5. Water bath carburetor; 51. Connecting pipe; 511. Three-way control valve; 6. Engine cooling water system; 7. Cooling pipe; 71. Refrigeration device; 8. Pressure sensor; 9. Control system. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 and attached Figure 2 This application will be described in further detail below.

[0031] Example:

[0032] This application discloses a multifunctional LNG cylinder with both thermal pressurization and cooling output. (Refer to...) Figure 1 A multifunctional LNG cylinder with thermal pressurization and cooling output includes an outer shell 1 and an inner liner 2. The inner liner 2 is disposed inside the outer shell 1, and a vacuum jacket 3 is formed between the outer shell 1 and the inner liner 2. An internal tube 21 is welded to the bottom outer wall of the inner liner 2, and a working fluid flows through the internal tube 21. The two ends of the internal tube 21 are connected to a front circulation tube 31 and a rear circulation tube 32. One end of the front circulation tube 31 and the rear circulation tube 32 is located in the vacuum jacket 3, and the other end extends out of the outer shell 1 and is sequentially connected to a circulation pump pool 4 and a water bath vaporizer 5. The output end of the water bath vaporizer 5 is connected to the rear circulation tube 32. A shut-off valve 311 is installed on the front circulation tube 31, and a shut-off valve 321 is installed on the rear circulation tube 32. In this way, the internal tube 21, the front circulation tube 31, the circulation pump pool 4, the water bath vaporizer 5, and the rear circulation tube 32 together form a closed-loop phase change heat change system, in which the working fluid can circulate.

[0033] When the pressure in the gas phase space inside the inner liner 2 is insufficient, shut-off valve 311 and shut-off valve 321 are opened. The circulating pump 4 starts upon receiving the control signal, creating a pressure differential and promoting closed-loop flow. During this process, the liquid working fluid vaporizes after being heated by the water bath vaporizer 5, forming a gaseous working fluid. This gaseous working fluid enters the inner tube 21 through the rear circulation pipe 32 and exchanges heat with the inner tube 21, causing its temperature to rise. Simultaneously, the gaseous working fluid condenses to form a liquid working fluid and flows back to the front circulation pipe 31 to await heating. Subsequently, the inner tube 21 exchanges heat with the bottom space of the vacuum jacket 3, causing the temperature at the bottom of the inner liner 2 to rise. The inner liner 2 then exchanges heat with the liquid LNG within it, causing the liquid LNG to continuously vaporize, thereby increasing the pressure in the gas phase space inside the inner liner 2. When the pressure inside the inner liner 2 reaches the preset value, shut-off valve 321 is closed. By controlling the pressure increase inside the gas cylinder through the closed-loop phase change heat transfer system, the pressure inside the inner liner 2 is kept relatively balanced, thereby ensuring that the LNG gas cylinder can provide the engine with NG gas at a stable pressure, thus ensuring the engine's power performance.

[0034] Reference Figure 1 The circulating pump pool 4 is a submersible pump circulating pump pool 4. When the circulating pump pool 4 is started, the working fluid can circulate in a direction in the built-in pipe 21, the front circulating pipe 31, the circulating pump pool 4, the water bath vaporizer 5, and the rear circulating pipe 32, thereby improving the heat exchange efficiency, increasing the efficiency of liquid LNG vaporization in the inner tank 2, and thus making the gas pressure in the LNG cylinder increase faster, thereby improving the pressurization efficiency.

[0035] Reference Figure 1 and Figure 2 The inlet of the water bath vaporizer 5 is connected to the outlet of the engine cooling water system 6, and the outlet of the water bath vaporizer 5 is connected to the inlet of the engine cooling water system 6. In this way, on the one hand, the water bath vaporizer 5 absorbs heat from the hot water to heat the liquid working fluid flowing through it, thereby vaporizing it into a gaseous working fluid. The water bath vaporizer 5 has high heat transfer efficiency, and due to the high specific heat of water, using water as a medium is beneficial for adapting to different operating conditions. On the other hand, hot water discharged from the engine cooling water system 6 is passed into the water bath vaporizer 5, achieving waste heat recovery from the engine cooling water through energy borrowing, improving the energy efficiency ratio. After heat exchange between the hot water and the liquid working fluid, the water temperature decreases and flows back into the engine cooling water system 6 while the working fluid is vaporized, realizing water circulation between the water bath vaporizer 5 and the engine cooling water system 6.

[0036] Reference Figure 1The circulating pump tank 5 is connected to the input end of the water bath vaporizer 4 via a connecting pipe 51. A three-way control valve 511 is installed on the connecting pipe 51. The other port of the three-way control valve 511 is connected to a cooling pipe 7. The end of the cooling pipe 7 away from the three-way control valve 511 is connected to the rear circulation pipe 32. A refrigeration device 71 is connected to the cooling pipe 7. The three-way control valve 511 enables the water bath vaporizer 5 and the refrigeration device 71 to be connected in parallel, forming a dual hot and cold circuit based on the circulating pump tank 4. When not in operation, the three-way control valve 511 remains closed, and neither the hot nor cold phases operate. When the three-way control valve 511 is controlled to allow the working fluid to flow back to the built-in pipe 21 through the water bath vaporizer 5, the gas cylinder undergoes thermal pressurization. When the three-way control valve 511 is controlled to allow the working fluid to flow back to the built-in pipe 21 through the refrigeration device 71, the built-in pipe 21 is used to achieve heat exchange between the liquid LNG and the working fluid, the temperature of the working fluid decreases, and then the refrigeration device 71 outputs the cooling capacity, enabling the gas cylinder to achieve the function of active cooling.

[0037] Reference Figure 1 The LNG cylinder also includes a pressure sensor 8, with its sensing end located within the gas phase space of the inner liner 2. This sensor monitors the pressure within the gas phase space of the LNG cylinder. The pressure sensor 8 is connected to a control system 9, which in turn is connected to a circulating pump pool 4. When the pressure value detected by the pressure sensor 8 is less than a preset value, the pressure sensor 8 sends a signal to the control system 9. Upon receiving the signal, the control system 9 sends a start control signal to the circulating pump pool 4, thereby starting the circulating pump pool 4 and enabling directional circulation of the working fluid. This allows the LNG cylinder to operate under thermal pressurization. When the pressure within the inner liner 2 reaches the preset value, the pressure sensor 8 sends a signal to the control system 9. Upon receiving the signal, the control system 9 sends a stop control signal to the circulating pump pool 4, thereby stopping the circulating pump pool 4 and improving control efficiency.

[0038] Reference Figure 1 The control system 9 is connected to the three-way control valve 511 via a signal connection. Thus, the control system 9 can switch between the hot and cold dual circuits connected in parallel with the three-way control valve 511, facilitating the switching between hot pressurization and micro-energy cooling modes of the gas cylinder, further improving control efficiency, as detailed below:

[0039] When not in operation, the control system 9 remains in a neutral / off state, and there is no working fluid flowing in any pipeline;

[0040] When the pressure value detected by the pressure sensor 8 is less than the preset value, that is, when the gas cylinder pressure is insufficient, the control system 9 controls the circulation pump pool 4 to start and controls the three-way control valve 511 to open the heating side valve port of the connecting pipe 51. At this time, the connecting pipe 51 is completely open, and there is no working fluid flowing in the cooling pipe 7, so that the gas cylinder has the function of thermal pressurization.

[0041] When micro-powered cooling is required, the control system 9 controls the circulation pump pool 4 to start and controls the three-way control valve 511 to open the refrigeration side valve port of the cooling pipe 7. At this time, the cooling pipe 7 is completely open, and there is no working fluid flowing in the water bath vaporizer 5, so that the gas cylinder is in a micro-powered cooling state.

[0042] The implementation principle of a multifunctional LNG cylinder with thermal pressurization and cooling output according to an embodiment of this application is as follows: The built-in pipe 21, together with the front circulation pipe 31, the circulation pump pool 4, the water bath vaporizer 5, and the rear circulation pipe 32, form a closed-loop phase change heat exchange system, in which the working fluid can circulate. When the pressure in the gas phase space inside the inner liner 2 is insufficient, the first shut-off valve 311 and the second shut-off valve 321 are opened. After receiving the control signal, the circulation pump pool 4 starts, forming a pressure difference and promoting closed-loop flow. During this process, the liquid working fluid is vaporized after being heated by the water bath vaporizer 5 to form a gaseous working fluid. The gaseous working fluid enters the built-in pipe 21 through the rear circulation pipe 32 and exchanges heat with the built-in pipe 21, causing the temperature of the built-in pipe 21 to rise. At the same time, the gaseous working fluid condenses to form a liquid working fluid and flows back to the circulation pump pool 4, where it is pressurized and placed in the front circulation pipe 31 to await heating. Subsequently, the built-in pipe 21 exchanges heat with the bottom space of the vacuum jacket 3, causing the temperature at the bottom of the inner liner 2 to rise. The inner liner 2 then exchanges heat with the liquid LNG within it, causing the liquid LNG to continuously vaporize and thus increasing the pressure in the gas phase space inside the inner liner 2. When the pressure inside the inner liner 2 reaches a preset value, the shut-off valve 321 is closed. This closed-loop phase-change heat exchange system controls the stable increase of pressure inside the gas cylinder, ensuring a relative pressure balance within the inner liner 2. This guarantees that the LNG cylinder can provide a stable pressure of NG gas to the engine, thereby ensuring the engine's power performance.

[0043] The water bath vaporizer 5 and the refrigeration unit 71 are connected in parallel via a three-way control valve 511, forming a dual-loop system (hot and cold) based on the circulating pump tank 4. When not in operation, the three-way control valve 511 remains closed, and neither the hot nor cold phases operate. When the three-way control valve 511 is controlled to allow the working fluid to flow back through the water bath vaporizer 5 to the built-in pipe 21, the gas cylinder undergoes thermal pressurization. When the three-way control valve 511 is controlled to allow the working fluid to flow back through the refrigeration unit 71 to the built-in pipe 21, heat exchange between the liquid LNG and the working fluid is achieved through the built-in pipe 21, lowering the working fluid's temperature. The cooling capacity is then output through the refrigeration unit 71, enabling the gas cylinder to actively cool.

[0044] In this application, during hot pressurization, hot water discharged from the engine cooling water system 6 is introduced into the water bath carburetor 5. The water bath carburetor 5 absorbs heat from the hot water to heat the liquid working fluid flowing through it. By borrowing energy, the waste heat of the engine cooling water is recovered, and the energy efficiency ratio is improved. After the hot water and the liquid working fluid exchange heat, the water temperature decreases and flows back to the engine cooling water system 6 while the working fluid is vaporized, thus realizing water circulation between the water bath carburetor 5 and the engine cooling water system 6.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multifunctional LNG cylinder with thermal pressurization and cold output capabilities, characterized in that: The device includes an outer shell (1) and an inner liner (2). The inner liner (2) is located inside the outer shell (1). A vacuum interlayer (3) is formed between the outer shell (1) and the inner liner (2). An internal tube (21) is provided on the bottom outer wall of the inner liner (2). The internal tube (21) contains a working fluid and has a heat exchange function. A front circulation pipe (31) and a rear circulation pipe (32) are provided at both ends of the internal tube (21). One end of the front circulation pipe (31) and the rear circulation pipe (32) are located in the vacuum interlayer (3), and the other end extends out of the outer shell (1) and is connected in sequence to a circulation pump pool (4) and a water bath vaporizer (5). The output end of the water bath vaporizer (5) is connected to the rear circulation pipe (32). A shut-off valve one (311) is provided on the front circulation pipe (31), and a shut-off valve two (321) is provided on the rear circulation pipe (32). The circulating pump pool (4) is connected to the input end of the water bath vaporizer (5) through a connecting pipe (51). A three-way control valve (511) is provided on the connecting pipe (51). The three-way control valve (511) is connected to a cooling pipe (7). The end of the cooling pipe (7) away from the three-way control valve (511) is connected to the rear circulation pipe (32). A refrigeration device (71) is connected to the cooling pipe (7). It also includes a pressure sensor (8), the sensing end of which is located in the gas phase space of the inner liner (2). The pressure sensor (8) is connected to a control system (9), which is connected to the circulating pump pool (4) and to the three-way control valve (511).

2. The multifunctional LNG cylinder with thermal pressurization and cold output according to claim 1, characterized in that: The water inlet of the water bath vaporizer (5) is connected to the water outlet of the engine cooling water system (6), and the water outlet of the water bath vaporizer (5) is connected to the water inlet of the engine cooling water system (6).

3. A multifunctional LNG cylinder with thermal pressurization and cold output as described in claim 1, characterized in that: In the non-working state, the control system (9) remains in a neutral / closed state, and there is no working fluid flow in any pipeline; When the pressure value detected by the pressure sensor (8) is less than the preset value, that is, when the pressure of the gas cylinder is insufficient, the control system (9) controls the circulation pump pool (4) to start and controls the three-way control valve (511) to open the heating side valve of the connecting pipe (51). At this time, the connecting pipe (51) is completely open, and there is no working fluid flowing in the cooling pipe (7), so that the gas cylinder has the function of heat pressurization. When micro-powered cooling is required, the control system (9) controls the circulation pump pool (4) to start and controls the three-way control valve (511) to open the refrigeration side valve of the cooling pipe (7). At this time, the cooling pipe (7) is a complete passage, and there is no working fluid flowing in the water bath vaporizer (5), so that the gas cylinder is in a micro-powered cooling state.

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