Quantitative liquefied natural gas supply system and liquefied natural gas ship

Abstract

The utility model provides a quantitative liquefied natural gas supply system, which is used for inputting liquefied natural gas in a storage tank to a power device and comprises a vaporizer and a gas phase control valve. The vaporizer is communicated with the output end of the storage tank; the vaporizer can vaporize liquefied natural gas into natural gas; the gas phase control valve comprises a valve body, a gas blocking piece and a valve element, the input end of the valve body communicates with the output end of the vaporizer, and the output end of the valve body is used for communicating with the input end of the power device. An adjusting space is formed in the valve body; the air blocking piece is arranged in the adjusting space so as to separate the adjusting space; a vent hole is formed in the air blocking piece; the valve element is arranged relative to the vent hole and can abut against the air blocking piece. Wherein the valve element can move to shield the vent hole, and the valve element can adjust the output quantity of natural gas; the coincident area of the valve element and the vent hole is smaller than the area of the vent hole. The gas phase control valve can reduce the amount of natural gas input into the power device, improve the use efficiency of the natural gas and reduce the use cost of the ship.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied natural gas, in particular to a liquefied natural gas quantitative gas supply system and a liquefied natural gas ship. Background Art

[0002] Liquefied natural gas is a type of clean energy that can be widely used in chemical industry, transportation, power generation, seawater desalination and other fields.

[0003] At present, liquefied natural gas has been widely used in ships such as passenger ships, cruise ships, liquefied natural gas carriers, tankers and container ships. LNG ships generally include storage tanks, vaporizers and power units. The storage tank contains liquefied natural gas. The vaporizer is used to connect the storage tank and the power unit. The vaporizer can vaporize liquefied natural gas into natural gas and input it into the power unit to provide fuel for the power unit. After the power unit receives and burns natural gas, it provides energy for the ship's travel and daily use.

[0004] In the related art, the ship can switch between the sailing state and the stop state. However, no matter whether the ship is in the sailing state or the stop state, the amount of liquefied natural gas output from the tank to the power unit remains unchanged. When the ship is in the stop state, some equipment on the ship will be stopped accordingly. This leads to excessive output of liquefied natural gas, excess energy generated by the power unit, and high cost of ship use. Utility Model Content

[0005] The purpose of the present application is to provide a liquefied natural gas quantitative gas supply system and a liquefied natural gas ship, which can effectively adjust the output of liquefied natural gas and reduce the use cost of the ship.

[0006] In order to solve the above technical problems, this application adopts the following technical solutions:

[0007] According to one aspect of the present application, the present application provides a liquefied natural gas quantitative supply system, which is used to input the liquefied natural gas in the storage tank to the power device, and includes: a vaporizer and a gas phase control valve. The input end of the vaporizer is used to communicate with the output end of the storage tank; the vaporizer can vaporize the liquefied natural gas into natural gas; the gas phase control valve includes a valve body, a gas blocking member and a valve core, the input end of the valve body is connected to the output end of the vaporizer, and the output end of the valve body is used to connect to the input end of the power device; an adjustment space is provided in the valve body; the gas blocking member is arranged in the adjustment space to be able to separate the adjustment space; a vent is provided on the gas blocking member; the valve core is arranged relative to the vent, and the valve core can be against the gas blocking member; wherein the valve core can move to cover the vent, and the valve core can adjust the output of natural gas; the area overlapped by the valve core and the vent is smaller than the area of ​​the vent.

[0008] In some embodiments, the area where the valve core overlaps with the vent hole is less than or equal to 50% of the area of ​​the vent hole.

[0009] In some embodiments, the valve core is rotatably accommodated in the valve body, so that the valve core can rotate to cover part of the vent hole.

[0010] In some embodiments, a plurality of ventilation holes are formed on the air blocking member, and the plurality of ventilation holes are arranged on the air blocking member at intervals along the circumferential direction.

[0011] In some embodiments, the vent extends along an arc.

[0012] In some embodiments, the valve core includes a rotating part and an adjusting part, and the rotating part is rotatably connected to the valve body; the adjusting part is arranged opposite to the vent hole, and the adjusting part is connected to the rotating part so as to be able to rotate with the rotating part.

[0013] In some embodiments, the gas supply system also includes a buffer tank, a mass flow meter and a heater; the input end of the buffer tank is connected to the output end of the gas phase control valve, and the output end of the buffer tank is connected to the input end of the mass flow meter; the output end of the mass flow meter is connected to the input end of the heater; the output end of the heater is used to connect to the power device.

[0014] In some embodiments, the gas supply system also includes a bypass pipe and a bypass valve, the input end of the bypass pipe is connected to the output end of the buffer tank, and the output end of the bypass pipe is connected to the output end of the heating machine, so as to provide the natural gas to the power device; the bypass valve is arranged on the bypass pipe so as to be able to open and close the bypass pipe.

[0015] In some embodiments, the gas supply system also includes a liquid phase discharge valve and a liquid phase discharge emergency shut-off valve, the input end of the liquid phase discharge valve is used to connect to the output end of the storage tank, and the output end of the liquid phase discharge valve is connected to the input end of the liquid phase discharge emergency shut-off valve; the output end of the liquid phase discharge emergency shut-off valve is connected to the input end of the vaporizer; and / or the gas supply system also includes a gas phase discharge valve and a gas phase discharge emergency shut-off valve, the input end of the gas phase discharge valve is connected to the output end of the mass flow meter, and the output end of the gas phase discharge valve is connected to the input end of the gas phase discharge emergency shut-off valve; the output end of the gas phase discharge emergency shut-off valve is connected to the heating machine.

[0016] A liquefied natural gas ship comprises: a storage tank, a power unit and a liquefied natural gas quantitative gas supply system as described above; the storage tank is used to accommodate liquefied natural gas; the power unit is used to burn natural gas and provide kinetic energy; the liquefied natural gas quantitative gas supply system can vaporize the liquefied natural gas in the storage tank into natural gas and transport it to the power unit.

[0017] It can be seen from the above technical solution that the present application has at least the following advantages and positive effects:

[0018] In the present application, when the liquefied natural gas ship is sailing, the valve core is adjusted so that the valve core moves to the outside of the vent and the vent is fully opened. After the carburetor vaporizes the liquefied natural gas into natural gas, it is input into the power unit through the vent so that the power unit can drive the ship to move. When the liquefied natural gas ship is at a standstill, the valve core is adjusted to block part of the vent. The gas phase control valve can reduce the amount of natural gas input to the power unit so that the power unit can meet the energy required for the daily operation of the ship. Thereby improving the efficiency of natural gas use and reducing the cost of ship use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a storage tank and a quantitative gas supply system for liquid natural gas of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the valve core and the air blocking member of the utility model.

[0021] Figure 3 It is a structural schematic diagram of the utility model when the valve core blocks part of the vent hole.

[0022] The accompanying drawings are marked as follows: 1. Storage tank; 2. Vaporizer; 3. Gas phase control valve; 310. Gas blocking member; 311. Vent; 320. Valve core; 321. Rotating part; 322. Adjusting part; 4. Buffer tank; 5. Mass flow meter; 6. Heating machine; 7. Liquid phase discharge valve; 8. Liquid phase discharge emergency shut-off valve; 9. First shut-off valve; 10. Second shut-off valve; 11. Bypass valve; 12. Gas phase discharge valve; 13. Gas phase discharge emergency shut-off valve. DETAILED DESCRIPTION

[0023] Typical implementations that embody the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various changes in different implementations without departing from the scope of the present application, and the descriptions and illustrations therein are essentially used for illustrative purposes rather than for limiting the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In related technologies, ships have gradually begun to use liquid natural gas as a power fuel to provide energy for the operation of ships, thereby reducing pollutant emissions.

[0026] Figure 1 It is a structural schematic diagram of a storage tank and a quantitative gas supply system for liquid natural gas of the utility model.

[0027] See also Figure 1 The liquefied natural gas ship (hereinafter referred to as the ship) includes a storage tank 1, a vaporizer 2 and a power unit. The storage tank 1 contains liquefied natural gas. The vaporizer 2 is connected to the storage tank 1 and the power unit. The vaporizer 2 can vaporize the liquefied natural gas into natural gas and input it into the power unit to provide fuel for the power unit. After the power unit receives and burns the natural gas, it provides energy for the ship's travel and daily use.

[0028] The ship has a sailing state and a stop state. Regardless of whether the ship is in a sailing state or a stop state, the amount of liquefied natural gas output from the storage tank 1 to the power unit remains unchanged. This results in excessive liquefied natural gas output, excess energy generated by the power unit, and high ship use costs.

[0029] See also Figure 1 The present application provides a liquefied natural gas quantitative supply system, which is used to vaporize the liquefied natural gas in the storage tank 1 and input it into the power unit. The liquefied natural gas supply system can adjust the amount of natural gas input to the power unit according to the operating state of the ship. This can prevent excessive natural gas from being input into the power unit, prevent the power unit from generating excess energy, and reduce the use cost of the ship.

[0030] Figure 2 It is a structural schematic diagram of the valve core and the air blocking member of the utility model. Figure 3 It is a structural schematic diagram of the utility model when the valve core blocks part of the vent hole.

[0031] See also Figures 1 to 3 In this embodiment, the liquefied natural gas quantitative supply system may include: a vaporizer 2 and a gas phase control valve 3. The input end of the vaporizer 2 is used to communicate with the output end of the storage tank 1. The vaporizer 2 can vaporize the liquid natural gas into natural gas. The gas phase control valve 3 may include a valve body (not shown in the figure), a gas blocking member 310 and a valve core 320. The input end of the valve body can be connected to the output end of the vaporizer 2. The output end of the valve body can be used to connect to the input end of the power device. An adjustment space may be opened in the valve body. The gas blocking member 310 can be arranged in the adjustment space to be able to separate the adjustment space. A vent 311 may be opened on the gas blocking member 310. The valve core 320 can be arranged relative to the vent 311. The valve core 320 can be supported on the gas blocking member 310. The valve core 320 can move to cover the vent hole 311 , and the valve core 320 can adjust the output of natural gas; the overlapping area of ​​the valve core 320 and the vent hole 311 is smaller than the area of ​​the vent hole 311 .

[0032] The ship can switch between the sailing state and the stop state. When the ship is in the sailing state, the valve core 320 rotates to open all the vent holes 311, so that the storage tank 1 provides sufficient natural gas for the power device to ensure sufficient power when the ship is sailing.

[0033] When the ship is in a stop state, the valve core 320 is rotated so that the valve core 320 covers part of the vent hole 311. On the one hand, the amount of natural gas input to the power device is effectively reduced to prevent waste of natural gas, prevent excess energy generated by the power device, and reduce the use cost of the ship. On the other hand, the vent hole 311 of the gas phase control valve 3 is at least partially in an open state, so as to ensure that the power device is always in a working state, provide energy for the daily use of the ship, and ensure the stable and reliable operation of various equipment on the ship.

[0034] In this embodiment, the structure of the vaporizer 2 may refer to the structure of an existing vaporizer 2 , which can vaporize liquid natural gas into natural gas.

[0035] See also Figures 1 to 3 In this embodiment, the gas phase control valve 3 can be arranged between the carburetor 2 and the power device. The input end of the gas phase control valve 3 can be connected to the output end of the carburetor 2. The output end of the gas phase control valve 3 can be used to connect to the power device to control the amount of natural gas input to the power device, thereby preventing the waste of natural gas and reducing the use cost of the ship.

[0036] See also Figure 2 and Figure 3, the gas phase control valve 3 may include a valve body, a gas blocking member 310 and a valve core 320. The input end of the valve body may be connected to the output end of the vaporizer 2. The output end of the valve body may be used to connect to a power unit. A working space may be provided in the valve body. The gas blocking member 310 may be arranged in the working space to separate the working space. A vent 311 may be provided on the gas blocking member 310, and the vent 311 may connect the working spaces on both sides of the gas blocking member 310. The valve core 320 may be movably accommodated in the working space so as to be able to cover part of the vent 311. The valve core 320 is adapted to the gas blocking member 310, so as to be able to adjust the amount of natural gas output by the gas phase control valve 3, so as to improve the energy utilization rate of natural gas and reduce the production cost of the ship.

[0037] See also Figures 1 to 3 In this embodiment, both ends of the valve body can be opened to form the input end and output end of the valve body respectively. The input end of the valve body can be connected to the output end of the vaporizer 2 and the working space on one side of the gas barrier 310. The output end of the valve body can be connected to the working space on the other side of the gas barrier 310 and the power device. Thus, the valve body and the gas barrier 310 can adjust the amount of natural gas input from the vaporizer 2 to the power device.

[0038] See also Figure 2 and Figure 3 In this embodiment, the air blocking member 310 can be located in the working space. The peripheral side wall of the air blocking member 310 can be against the inner peripheral wall of the working space to separate the working space. The air blocking member 310 can be provided with a vent hole 311 to connect the working spaces on both sides. The air blocking member 310 can be matched with the valve core 320, so that the opening area of ​​the vent hole 311 can be adjusted to adjust the amount of natural gas passing through.

[0039] In some embodiments, the air blocking member 310 may be located at the output end of the valve body to facilitate the movement of the valve core 320 to adjust the opening degree of the vent hole 311 .

[0040] See also Figure 2 and Figure 3 In this embodiment, a plurality of vent holes 311 may be provided on the gas blocking member 310. The plurality of vent holes 311 may be arranged at intervals along the circumferential direction on the gas blocking member 310. The provision of the plurality of vent holes 311 facilitates the valve core 320 to adjust the opening degree of the vent holes 311, thereby increasing the controllability of the gas phase control valve 3 and improving the adjustment efficiency of the gas phase control valve 3.

[0041] In some embodiments, a plurality of vent holes 311 may be arranged in a circular pattern at intervals on the air blocking member 310 , so that the valve core 320 can adjust the opening area of ​​the vent holes 311 .

[0042] In some embodiments, the vent hole 311 may extend along an arc shape, so as to facilitate the valve core 320 to open and cover the vent hole 311 .

[0043] See also Figure 2 and Figure 3 In this embodiment, the valve core 320 is rotatably accommodated in the valve body, so that the valve core 320 can rotate to cover part of the vent hole 311. This can effectively improve the movement efficiency of the valve core 320, so that the opening state of the vent hole 311 can be adjusted conveniently and quickly.

[0044] In some embodiments, the valve core 320 can be disposed on a side of the gas blocking member 310 close to the valve body input end, thereby ensuring the safety of the gas-phase controllable valve. In other embodiments, the valve core 320 can be disposed on a side of the gas blocking member 310 close to the valve body output end, thereby facilitating the movement of the valve core 320.

[0045] See also Figure 2 and Figure 3 In this embodiment, the valve core 320 may include a rotating portion 321 and an adjusting portion 322. The rotating portion 321 may be rotatably connected to the valve body. The adjusting portion 322 may be arranged opposite to the vent hole 311. The adjusting portion 322 may be connected to the rotating portion 321 so as to rotate with the rotating portion 321.

[0046] In some embodiments, the rotation axis of the rotating portion 321 is located in the middle of the plurality of vents 311. When the rotating portion 321 rotates, the adjusting portion 322 can cover the vents 311.

[0047] See also Figure 2 and Figure 3 In this embodiment, three vents 311 may be provided on the air blocking member 310. The three vents 311 may extend along an arc. The three vents 311 are arranged in a circular pattern. The valve core 320 is provided corresponding to the air blocking member 310. The valve core 320 includes a rotating portion 321 and three adjusting portions 322. The rotating portion 321 is located in the middle of the three through holes. The rotation axis of the rotating portion 321 is located at the center of the circle formed by the arrangement of the three through holes. The adjusting portion 322 is provided corresponding to the vent 311.

[0048] When the rotating member rotates, the three adjusting parts 322 can respectively cover the three vents 311, so as to simultaneously adjust the opening area of ​​the vents 311, thereby facilitating the adjustment of the ventilation rate of the air blocking member 310.

[0049] In some embodiments, the air blocking member 310 may be provided with one vent hole 311. In some embodiments, the air blocking member 310 may be provided with a plurality of vent holes 311 at intervals. In other embodiments, the air blocking member 310 may be provided with two vent holes 311, three vent holes 311, four vent holes 311, five vent holes 311, or six vent holes 311.

[0050] In some embodiments, the valve core 320 can be translationally disposed in the valve body, so that the valve core 320 can move to cover a portion of the vent hole 311 .

[0051] In some embodiments, the overlapping area of ​​the valve core 320 and the vent hole 311 is less than or equal to 50% of the area of ​​the vent hole 311. This ensures that at least part of the vent hole 311 is in an open state, thereby providing energy for daily use of the ship.

[0052] See also Figure 1 In this embodiment, the liquid natural gas supply system may further include a buffer tank 4, a mass flow meter 5 and a heater 6. The input end of the buffer tank 4 may be connected to the output end of the gas phase control valve 3. The output end of the buffer tank 4 may be connected to the input end of the mass flow meter 5. The output end of the mass flow meter 5 may be connected to the input end of the heater 6. The output end of the heater 6 may be used to connect to the power device. After passing through the output end of the gas phase control valve 3, the natural gas may pass through the buffer tank 4, the mass flow meter 5 and the heater 6 in sequence, so that the natural gas may be stably and efficiently input into the power device to ensure that the power device burns the natural gas stably and efficiently.

[0053] In some embodiments, the liquefied natural gas supply system may further include a buffer tank 4. The input end of the buffer tank 4 may be connected to the output end of the gas phase control valve 3. The output end of the buffer tank 4 may be used to connect to the input end of the power device.

[0054] The buffer tank 4 can receive the natural gas output by the gas phase control valve 3 to ensure the stability of the gas pressure and the output flow rate of the natural gas, thereby ensuring the stability of the efficiency of the power device burning natural gas.

[0055] In some embodiments, the liquefied natural gas supply system may further include a mass flow meter 5. The input end of the mass flow meter 5 may be connected to the output end of the buffer tank 4. The output end of the mass flow meter 5 may be used to connect to a power device.

[0056] The mass flow meter 5 can count the amount of natural gas outputted by the buffer tank 4 in real time, so as to monitor the operating status of the liquefied natural gas supply system in real time, thereby facilitating the staff to monitor, adjust and maintain the liquefied natural gas supply system.

[0057] In some embodiments, the liquefied natural gas supply system may further include a heater 6. The input end of the heater 6 may be connected to the output end of the mass flow meter 5. The output end of the heater 6 may be used to connect to the power device. The heater 6 can increase the temperature of the natural gas so that the power device burns the natural gas and improves the combustion efficiency of the natural gas.

[0058] See also Figure 1In this embodiment, the liquefied natural gas supply system may further include a bypass pipe. The input end of the bypass pipe may be connected to the output end of the buffer tank 4. The output end of the bypass pipe may be connected to the input end of the heater 6 to provide natural gas for the power device.

[0059] In some embodiments, the liquefied natural gas supply system may further include a bypass valve 11. The bypass valve 11 is disposed on the bypass pipe to be able to open and close the bypass pipe.

[0060] In some embodiments, the liquefied natural gas supply system may further include a first three-way valve (not shown in the figure) and a second three-way valve (not shown in the figure). The first three-way valve may include a first input end, a first output end and a third output end. The first input end may be connected to the output end of the buffer tank 4. The first output end may be connected to the input end of the mass flow meter 5. The second output end may be connected to the input end of the bypass pipe. The first three-way valve can control the natural gas in the buffer tank 4 to be input into the mass flow meter 5 or the bypass pipe. This can improve the reliability and stability of the liquefied natural gas supply system. It is convenient for the inspection, maintenance and replacement of the buffer tank 4, the mass flow meter 5 and the bypass pipe.

[0061] The second three-way valve may include a second input end, a third input end and a third output end. The second input end may be connected to the output end of the mass flow meter 5. The third input end may be connected to the output end of the bypass pipe. The third output end may be connected to the input end of the heating machine 6. The second three-way valve and the first three-way valve facilitate the inspection, maintenance and replacement of the mass flow meter 5 and the bypass pipe.

[0062] See also Figure 1 In this embodiment, the liquefied natural gas supply system may further include a liquid phase discharge valve 7 and a liquid phase discharge emergency shut-off valve 8. The input end of the liquid phase discharge valve 7 may be used to connect to the output end of the storage tank. The output end of the liquid phase discharge valve 7 may be connected to the input end of the liquid phase discharge emergency shut-off valve 8. The output end of the liquid phase discharge emergency shut-off valve 8 may be connected to the input end of the vaporizer 2.

[0063] The liquid phase discharge valve 7 and the liquid phase discharge emergency shut-off valve 8 can cut off the output of the liquefied natural gas in the storage tank 1, so as to facilitate the inspection, maintenance and replacement of the liquefied natural gas supply system.

[0064] In some embodiments, the liquefied natural gas supply system may further include a liquid phase discharge valve 7. The input end of the liquid phase discharge valve 7 may be used to connect to the output end of the storage tank. The output end of the liquid phase discharge valve 7 may be connected to the input end of the vaporizer 2.

[0065] In some embodiments, the liquefied natural gas supply system may further include a gas phase discharge valve 12 and a gas phase discharge emergency shut-off valve 13. The input end of the gas phase discharge valve 12 may be connected to the output end of the mass flow meter 5. The output end of the gas phase discharge valve 12 may be connected to the input end of the gas phase discharge emergency shut-off valve 13. The output end of the gas phase discharge emergency shut-off valve 13 may be connected to the heater 6.

[0066] The gas phase discharge valve 12 and the gas phase discharge emergency shut-off valve 13 can shut off the natural gas input to the heater 6 to facilitate the inspection, maintenance and replacement of the liquefied natural gas supply system.

[0067] In some embodiments, the liquefied natural gas supply system may further include a gas phase discharge valve 12. The input end of the gas phase discharge valve 12 may be connected to the output end of the mass flow meter 5. The output end of the gas phase discharge valve 12 may be connected to the input end of the heater 6.

[0068] See also Figure 1 In this embodiment, the liquefied natural gas supply system may further include a first stop valve 9. The first stop valve 9 is disposed at the input end of the mass flow meter 5 to stop the natural gas from entering the mass flow meter 5, so as to facilitate the inspection, replacement and maintenance of the mass flow meter 5.

[0069] In some embodiments, the first stop valve 9 is disposed between the first output end of the first three-way valve and the input end of the mass flow meter 5 .

[0070] In this embodiment, the liquefied natural gas supply system may further include a second stop valve 10. The second stop valve 10 is disposed at the output end of the mass flow meter 5 to prevent the natural gas output from the bypass pipe from flowing back into the mass flow meter 5, thereby facilitating the inspection, replacement and maintenance of the mass flow meter 5.

[0071] In some embodiments, the second stop valve 10 is disposed between the output end of the mass flow meter 5 and the second input end of the second three-way valve.

[0072] See also Figures 1 to 3 In the present invention, the liquid phase discharge valve 7 and the liquid phase discharge emergency shut-off valve 8 are opened to allow the liquefied natural gas in the storage tank 1 to enter the vaporizer 2 and be vaporized into natural gas.

[0073] When the ship is in a navigation state, the gas phase control valve 3 is adjusted to rotate the rotating part 321, and the regulating part 322 follows the rotating part 321 to rotate to the outside of the vent hole 311. The vent hole 311 is fully opened, and the natural gas output by the vaporizer 2 is input into the buffer tank 4 through the vent hole 311. The natural gas in the buffer tank 4 passes through the mass flow meter 5 and the heater 6 in turn, and is input into the power device. So that the power device can burn a large amount of natural gas to provide sufficient kinetic energy for the ship, thereby meeting the energy required for navigation and daily use of the ship.

[0074] When the ship is in a stop state, the gas phase control valve 3 is adjusted to rotate the rotating part 321, and the regulating part 322 rotates with the rotating part 321 to cover part of the vent 311. The vent 311 is partially opened, and the natural gas output by the vaporizer 2 enters the buffer tank 4 after passing through the vent 311. The natural gas in the buffer tank 4 passes through the mass flow meter 5 and the heater 6 in turn, and is input into the power device. So that the power device can burn natural gas to provide sufficient kinetic energy for the ship, thereby meeting the energy required for daily use of the ship.

[0075] In the present application, when the liquefied natural gas ship is traveling, the valve core 320 is adjusted so that the valve core 320 moves to the outside of the vent hole 311 and the vent hole 311 is fully opened. After the vaporizer 2 vaporizes the liquefied natural gas into natural gas, it is input into the power unit through the vent hole 311 so that the power unit can drive the ship to move. When the liquefied natural gas ship is at a standstill, the valve core 320 is adjusted to block part of the vent hole 311. The gas phase control valve 3 can reduce the amount of natural gas input into the power unit so that the power unit can meet the energy required for the daily operation of the ship. Thereby improving the use efficiency of natural gas and reducing the use cost of the ship.

[0076] The utility model also provides a liquefied natural gas ship. The liquefied natural gas ship may include: a storage tank 1, a power device and the above liquefied natural gas quantitative gas supply system. The storage tank 1 is used to contain liquefied natural gas. The power device is used to burn natural gas and provide kinetic energy. The liquefied natural gas quantitative gas supply system can vaporize the liquefied natural gas in the storage tank 1 into natural gas and transport it to the power device.

[0077] The liquefied natural gas ship can switch between the navigation state and the stop state. When the liquefied natural gas ship is in the navigation state, the regulating part 322 in the liquefied natural gas quantitative control system moves to the outside of the vent hole 311, and the gas phase control valve 3 can pass a large amount of natural gas to provide a large amount of natural gas for the power device, thereby meeting the energy required for the navigation and daily use of the ship.

[0078] When the LNG ship is in a stop state, the regulating part 322 in the LNG quantitative control system moves to the vent hole 311 to cover part of the vent hole 311. The gas phase control valve 3 can pass natural gas to provide natural gas to the power device, thereby meeting the energy required for daily use of the ship.

[0079] Although the present application has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A liquefied natural gas quantitative supply system, which is used to input the liquefied natural gas in the storage tank into the power device, characterized in that: include: A vaporizer, whose input end is used to communicate with the output end of the storage tank; the vaporizer can vaporize the liquid natural gas into natural gas; A gas phase control valve, comprising a valve body, a gas blocking member and a valve core, wherein the input end of the valve body is connected to the output end of the carburetor, and the output end of the valve body is used to connect to the input end of the power device; an adjustment space is provided in the valve body; the gas blocking member is arranged in the adjustment space to be able to separate the adjustment space; a vent hole is provided on the gas blocking member; the valve core is arranged relative to the vent hole, and the valve core can be held against the gas blocking member; The valve core can move to cover the vent hole, and the valve core can adjust the output of the natural gas; the overlapping area of ​​the valve core and the vent hole is smaller than the area of ​​the vent hole.

2. The gas supply system according to claim 1, characterized in that: The overlapping area of ​​the valve core and the vent hole is less than or equal to 50% of the area of ​​the vent hole.

3. The gas supply system according to claim 1, characterized in that: The valve core is rotatably accommodated in the valve body, so that the valve core can rotate to cover a portion of the vent hole.

4. The gas supply system according to claim 3, characterized in that: The air blocking member is provided with a plurality of vent holes, and the plurality of vent holes are arranged at intervals along the circumferential direction on the air blocking member.

5. The gas supply system according to claim 3, characterized in that: The vent hole extends along an arc shape.

6. The gas supply system according to claim 3, characterized in that: The valve core includes a rotating part and an adjusting part, wherein the rotating part is rotatably connected to the valve body; the adjusting part is arranged opposite to the vent hole, and the adjusting part is connected to the rotating part so as to be able to rotate along with the rotating part.

7. The gas supply system according to claim 1, characterized in that: The gas supply system also includes a buffer tank, a mass flow meter and a heater; the input end of the buffer tank is connected to the output end of the gas phase control valve, and the output end of the buffer tank is connected to the input end of the mass flow meter; the output end of the mass flow meter is connected to the input end of the heater; the output end of the heater is used to connect to the power device.

8. The gas supply system according to claim 7, characterized in that: The gas supply system also includes a bypass pipe and a bypass valve. The input end of the bypass pipe is connected to the output end of the buffer tank, and the output end of the bypass pipe is connected to the input end of the heater to provide the natural gas to the power unit. The bypass valve is arranged on the bypass pipe to be able to open and close the bypass pipe.

9. The gas supply system according to claim 7, characterized in that: The gas supply system further comprises a liquid phase discharge valve and a liquid phase discharge emergency shut-off valve, wherein the input end of the liquid phase discharge valve is used to communicate with the output end of the storage tank, and the output end of the liquid phase discharge valve is connected to the input end of the liquid phase discharge emergency shut-off valve; the output end of the liquid phase discharge emergency shut-off valve is connected to the input end of the vaporizer; and / or The gas supply system also includes a gas phase exhaust valve and a gas phase exhaust emergency shut-off valve, the input end of the gas phase exhaust valve is connected to the output end of the mass flow meter, and the output end of the gas phase exhaust valve is connected to the input end of the gas phase exhaust emergency shut-off valve; the output end of the gas phase exhaust emergency shut-off valve is connected to the heating machine.

10. A liquefied natural gas ship, characterized in that: include: A storage tank, which is used to contain liquid natural gas; A power plant for burning natural gas and providing kinetic energy; The liquefied natural gas quantitative gas supply system according to any one of claims 1 to 9 is capable of vaporizing the liquefied natural gas in the storage tank into natural gas and transporting it to the power unit.

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