Ventilation mast for LNG (Liquefied Natural Gas) ship

Abstract

When the ventilation mast for the LNG ship is used, the lifting driving piece is adjusted according to the concentration of BOG, so that the lifting driving piece drives the lifting cover to move in the direction close to or away from the main body, and the size of a discharging channel formed between the lifting cover and the main body is adjusted so as to adapt to the concentration of the BOG, and air of the BOG can be rapidly discharged to the outside conveniently. Meanwhile, when the wind power in the air is large, the lifting cover is driven to be close to the main body through the lifting driving piece so as to shrink the discharging channel, so that the discharging channel forms a narrow pipe effect under the action of the wind power, the air pressure at the discharging channel is lower than the air pressure in the air discharging channel, and then the discharging efficiency of BOG is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of LNG ships, in particular to a LNG ship venting mast. BACKGROUND

[0002] LNG ships transport liquefied natural gas, which is extremely cold, about -162 degrees Celsius. The cargo hold for storing LNG needs to be highly insulated, but even so, a portion of the LNG will vaporize, producing boil-off gas (BOG), which must be properly handled, otherwise the pressure in the cargo hold will rise, leading to danger. If the BOG cannot be handled in time (such as being re-liquefied or used as fuel), the pressure in the cargo hold will gradually rise, possibly causing structural damage or explosion risk. At this time, excess gas needs to be safely discharged through the venting mast.

[0003] However, in the process of use, since the discharge channel at the top of the venting mast is in an open-air state, and only a venting net and a rain cover are provided, the rain cover will partially block the discharge channel of the venting mast, and when a large amount of BOG needs to be discharged, since the rain cover is fixed with the venting mast, the channel size between the rain cover and the venting mast and the discharge amount cannot be adjusted according to the discharge amount of the BOG during the discharge process, so that the BOG will accumulate in the discharge channel during use, and a large amount of BOG is produced but cannot be quickly discharged, which may cause danger due to the BOG not being discharged in the first time. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a LNG ship venting mast to solve the above problems.

[0005] Embodiments of the present application provide a LNG ship venting mast, comprising:

[0006] a main body, an exhaust channel, an air inlet and an air outlet are formed in the main body, the air inlet and the air outlet are respectively arranged at two ends of the main body, and the air inlet and the air outlet are in communication;

[0007] a lifting cover is arranged on the main body and partially blocks the air outlet in the opening direction of the air outlet, and a discharge channel in communication with the air outlet is formed between the lifting cover and the main body;

[0008] a lifting driving member is fixed to one end of the main body and drivingly connected to the other end of the lifting cover.

[0009] In at least one embodiment of the present application, the exhaust channel has a circular segment and an elliptical segment in communication with the circular segment, one end of the elliptical segment close to the circular segment gradually expands away from the circular segment to form the air outlet, and the circular segment is in communication with the air inlet.

[0010] In at least one embodiment of the present application, the LNG ship venting mast further comprises:

[0011] A flow guide portion is arranged on the outer circumferential surface of the main body and located at one end of the main body close to the gas outlet. The flow guide portion is formed as an oval protrusion outward away from the outer circumferential surface of the main body. An arc-shaped flow guide surface is formed on the side of the flow guide portion away from the main body. A flow guide opening is arranged on the flow guide portion and communicates with the gas outlet. The flow guide opening is arranged on both sides of the main body.

[0012] In at least one embodiment of the present application, a skeleton is arranged in the main body. The skeleton divides the exhaust passage into a first gas outlet passage and a second gas outlet passage.

[0013] In at least one embodiment of the present application, a mounting groove is arranged on the skeleton.

[0014] The lifting drive member comprises:

[0015] A motor is fixedly installed in the mounting groove.

[0016] A drive screw is installed on the output end of the motor.

[0017] A screw hole is arranged on the lifting cover. One end of the drive screw is accommodated in the screw hole and is in transmission connection with the lifting cover.

[0018] In at least one embodiment of the present application, a guide column is arranged on one end of the lifting cover close to the main body.

[0019] A guide hole is further arranged on the skeleton. The guide column is accommodated in the guide hole.

[0020] In at least one embodiment of the present application, the lifting cover completely blocks the gas outlet in the axial direction of the drive screw.

[0021] In at least one embodiment of the present application, the width of the first gas outlet passage is denoted as a, and the width of the second gas outlet passage is denoted as b. The relationship a>b is satisfied.

[0022] In at least one embodiment of the present application, the first gas outlet passage is two groups. The second gas outlet passage is located between the two groups of first gas outlet passages.

[0023] In at least one embodiment of the present application, the main body comprises:

[0024] An air inlet section is arranged with the air inlet.

[0025] A communication section is in communication with one end of the air inlet section.

[0026] The air outlet section is provided with the air outlet, and the other end of the connecting section is connected to the air outlet section.

[0027] In at least one embodiment of this application, the air intake section and the air outlet section are arranged in parallel, and the connecting section is arranged at an angle to the air intake section.

[0028] In at least one embodiment of this application, the peripheral wall of the air outlet section is provided with a through opening, and the through opening is connected to the air outlet;

[0029] The LNG marine ventilated mast also includes:

[0030] A barrier net is installed at the air outlet.

[0031] Implementing the LNG marine ventilated mast of this embodiment will have at least the following beneficial effects:

[0032] The aforementioned LNG marine vented mast, during use, adjusts the lifting drive according to the BOG concentration. This allows the lifting drive to move the lifting cover closer to or further away from the main body, thereby adjusting the size of the exhaust channel formed between the lifting cover and the main body to accommodate the BOG concentration and facilitate the rapid discharge of BOG air to the outside. Simultaneously, when wind speeds are high, the lifting drive moves the lifting cover closer to the main body, narrowing the exhaust channel. This creates a "narrowing effect" in the exhaust channel under wind force, resulting in lower air pressure at the exhaust channel compared to the exhaust channel, thus increasing BOG emission efficiency. Attached Figure Description

[0033] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0034] Figure 1 This is a structural diagram of the LNG marine ventilated mast of this utility model;

[0035] Figure 2 for Figure 1 Exploded view of the LNG ship's permeable mast;

[0036] Figure 3 for Figure 2 Structural diagram of the lifting cover;

[0037] Figure 4 for Figure 2 Structural diagram of the main body;

[0038] Figure 5 for Figure 2 Structural diagram of the lifting drive component;

[0039] Figure 6 Fig. 1 is a structural diagram of a venting mast for an LNG ship according to an embodiment of the present application; Figure 1 Fig. 2 is a sectional view of the venting mast for the LNG ship according to the embodiment of the present application;

[0040] Figure 7 Fig. 3 is a structural diagram of another embodiment of the venting mast for the LNG ship according to the present application; Figure 1 Fig. 4 is a sectional view of the venting mast for the LNG ship according to the embodiment of the present application;

[0041] Figure 8 Fig. 5 is a structural diagram of another embodiment of the venting mast for the LNG ship according to the present application; Figure 7 Fig. 6 is a sectional view of the venting mast for the LNG ship according to the embodiment of the present application.

[0042] Explanation of main component symbols

[0043] 100, venting mast for an LNG ship;

[0044] 110, main body; 110a, exhaust passage; 110b, air inlet; 110c, air outlet; 111, skeleton; 111a, first air outlet passage; 111b, second air outlet passage; 111c, mounting groove; 111d, guide hole; 112, air inlet section; 113, communication section; 114, air outlet section; 110d, through hole; 110e, circular section; 110f, elliptical section; 115, flow guide; 115a, flow guide hole;

[0045] 120, lifting cover; 120a, discharge passage; 120b, screw hole; 121, guide post;

[0046] 130, lifting driving member; 131, motor; 132, driving screw;

[0047] 140, screen. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of, but not all of the embodiments of the present application.

[0049] It should be noted that when one component is considered to be "connected" to another component, it can be directly connected to the other component or can exist with a middle component. When one component is considered to be "provided on" another component, it can be directly provided on the other component or can exist with a middle component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0050] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0051] Embodiments of the present application provide a gas permeable mast 100 for LNG ships, comprising:

[0052] a main body 110, which is internally provided with an exhaust passage 110a, an air inlet 110b and an air outlet 110c, the air inlet 110b and the air outlet 110c are respectively arranged at two ends of the main body 110, and the air inlet 110b and the air outlet 110c are in communication;

[0053] a lifting cover 120, which is arranged on the main body 110 and partially blocks the air outlet 110c along the opening direction of the air outlet 110c, and a discharge passage 120a in communication with the air outlet 110c is formed between the lifting cover 120 and the main body 110;

[0054] a lifting driving member 130, one end of which is fixed to the main body 110, and the other end is in transmission connection with the lifting cover 120.

[0055] Please refer to Figures 1-8 In this embodiment, during use, the lifting driving member 130 is adjusted according to the concentration of BOG, so that the lifting driving member 130 drives the lifting cover 120 to move towards or away from the main body 110, thereby adjusting the size of the discharge passage 120a formed between the lifting cover 120 and the main body 110, to adapt to the concentration of BOG, and facilitate the rapid discharge of air of BOG to the outside. At the same time, when the wind in the air is relatively large, the lifting cover 120 is driven to approach the main body 110 by the lifting driving member 130, so as to reduce the discharge passage 120a, so that the discharge passage 120a is under the action of wind force to form a "narrow pipe effect", so that the air pressure at the discharge passage 120a is lower than that in the exhaust passage 110a, thereby increasing the discharge efficiency of BOG.

[0056] It should be noted that the main body 110 is generally an inclined hollow tubular, the exhaust passage 110a is a hollow passage, the air inlet 110b is in communication with the discharge port of the LNG fuel system, the air inlet 110b is a through hole, the air outlet 110c is a through hole, and the air outlet 110c is used to communicate with the outside.

[0057] The lifting cover 120 is generally plate-shaped, and the side close to the main body 110 is recessed inward to form a cover shape, and the middle part is protruded to form a positioning part away from the main body 110, a threaded hole 120b is arranged on the positioning part, and the positioning part is generally cylindrical.

[0058] Since the lifting cover 120 blocks the air outlet 110c along the opening direction of the air outlet 110c, rainwater is prevented from entering the exhaust passage 110a through the air outlet 110c.

[0059] In at least one embodiment of the present application, the exhaust passage 110a has a circular segment 110e and an elliptical segment 110f in communication with the circular segment 110e, the elliptical segment 110f gradually expands away from the circular segment 110e at one end close to the circular segment 110e to form the gas outlet 110c, and the circular segment 110e is in communication with the gas inlet 110b.

[0060] Please refer to Figures 1-8 In the present embodiment, since the exhaust passage 110a has the circular segment 110e and the elliptical segment 110f, and the elliptical segment 110f gradually expands away from the circular segment 110e at one end close to the circular segment 110e to form the gas outlet 110c, when the BOG gas is discharged, the circular cross section is an axisymmetric structure when the BOG gas enters the circular segment 110e, the flow velocity distribution of the BOG gas in the circular pipeline is more uniform (follows the Hagen-Poiseuille flow characteristics), the turbulent flow and energy loss caused by the flow velocity difference can be reduced, and the stable flow of the BOG gas can be maintained.

[0061] The elliptical segment 110f gradually expands from the end of the circular segment 110e to form a gradually expanding cross section, which functions to gradually convert the kinetic energy (high speed) of the BOG gas into pressure energy (low speed and high pressure), and reduce the flow separation and vortex caused by sudden expansion.

[0062] The BOG gas is guided to extend to both sides, the lateral dilution is accelerated by using natural wind power, and the risk of accumulation of flammable gas around the ship is reduced.

[0063] At the same time, the LNG ship venting mast 100 is kept at a certain height from the deck to avoid the BOG gas from sinking to the deck area too early.

[0064] The end of the elliptical segment 110f is further expanded to form the gas outlet 110c, the contact area of the gas and the air is increased, the mixing of methane and air is promoted, and the concentration is quickly reduced to below the lower explosive limit (5%).

[0065] By adopting the gradually changing transition from the circular to the elliptical of the exhaust passage 110a to avoid sharp corners, local flow separation is reduced, the gas is smoothly discharged, and the BOG is prevented from remaining in the passage.

[0066] It needs to be further explained that the exhaust passage 110a is vertically arranged with the discharge passage 120a, the diameter of the discharge passage 120a is smaller than the minimum diameter of the exhaust passage 110a, the flow velocity on the outside is accelerated and the low-speed backflow area is formed on the inside under the influence of the centrifugal force when the gas makes a right-angle turn, which causes flow separation. The cross-sectional area of the turning part is reduced, the flow velocity is increased, a negative pressure area is formed, the high-speed gas flow entrains the surrounding air, and the methane concentration is reduced to below 1%.

[0067] In at least one embodiment of the present application, the LNG ship venting mast 100 further comprises:

[0068] The flow guide part 115 is arranged on the outer circumferential surface of the main body 110 and located at one end of the main body 110 close to the gas outlet 110c. The flow guide part 115 is formed as an oval protrusion outward away from the outer circumferential surface of the main body 110. An arc-shaped flow guide surface is formed on the side of the flow guide part 115 away from the main body 110. A flow guide opening 115a is arranged on the flow guide part 115 and communicates with the gas outlet 110c. The flow guide opening 115a is arranged on both sides of the main body 110.

[0069] Please refer to Figures 1-8 In the present embodiment, the flow guide part 115 is designed with three functions: the oval protrusion for horizontal diffusion, the arc-shaped flow guide surface for kinetic energy conversion, and the double-sided flow guide opening 115a for self-adaptive wind direction, so as to realize efficient and safe discharge of BOG.

[0070] The long-oval cross section reduces the windward surface resistance and avoids interference with the stability of ship navigation.

[0071] The oval streamline shape promotes the environmental wind to flow along the surface of the flow guide block, forms a boundary layer, and reduces the turbulence caused by flow separation.

[0072] The flow guide opening 115a is arranged on both sides of the flow guide block to guide the BOG gas horizontally to the outside of the ship, accelerate the dilution by using natural wind power, and avoid the accumulation of the gas in the deck area.

[0073] The circular cross section has axial symmetry, and the gas can achieve a relatively uniform flow velocity distribution in the Hagen-Poiseuille flow (laminar flow) or turbulent flow state, reducing flow separation and energy loss.

[0074] The oval segment 110f starts from the end of the circular segment 110e and gradually expands the major axis to form a gradually expanding flow passage.

[0075] The oval major axis direction (horizontal) expands more significantly, guiding the gas to diffuse to both sides and reducing the methane concentration.

[0076] It should be noted that the flow guide part 115 is arranged on one side of the windward surface of the main body 110, and the flow guide part 115 is arranged along the length direction of the main body 110. The flow guide part 115 is formed as a hill shape outward protruding from one end close to the gas outlet 110c, and the other end is inclined along the direction close to the main body 110 and adheres to the outer circumferential surface of the main body 110. The length direction of the flow guide part 115 is arranged along the length direction of the main body 110.

[0077] In at least one embodiment of the present application, the main body 110 is provided with a skeleton 111, which divides the exhaust passage 110a into a first exhaust passage 111a and a second exhaust passage 111b.

[0078] Please refer to Figures 1-8 , in this embodiment, the framework 111 is fixedly installed in the exhaust passage 110a, and the exhaust passage 110a is divided into a first exhaust passage 111a and a second exhaust passage 111b. The BOG gas is discharged through the first exhaust passage 111a and the second exhaust passage 111b to avoid danger. The framework 111 is generally in the shape of the Chinese character "丰" (Feng), and the length direction of the framework 111 is arranged along the length direction of the main body 110.

[0079] In this embodiment, the framework 111 is fixed to the main body 110 by an integral molding method.

[0080] In at least one embodiment of the present application, an installation groove 111c is provided on the framework 111;

[0081] The lifting drive member 130 includes:

[0082] A motor 131, fixedly installed in the installation groove 111c;

[0083] A driving screw rod 132, installed at the output end of the motor 131;

[0084] A screw hole 120b is provided on the lifting cover 120, and one end of the driving screw rod 132 is received in the screw hole 120b and is in transmission connection with the lifting cover 120.

[0085] Please refer to Figures 1-8 , in this embodiment, during use, the motor 131 moves, driving the driving screw rod 132 to rotate around its axis. Since the driving screw rod 132 is in transmission connection with the lifting cover 120, the driving screw rod 132 drives the lifting cover 120 to move in a direction closer to or farther from the main body 110, thereby adjusting the size of the discharge passage 120a.

[0086] In a windless environment, when it is necessary to accelerate the discharge of BOG gas, the motor 131 moves, driving the driving screw rod 132 to rotate around its axis. Since the driving screw rod 132 is in transmission connection with the lifting cover 120, the driving screw rod 132 drives the lifting cover 120 to move in a direction away from the main body 110, thereby increasing the discharge passage 120a to improve the discharge efficiency of BOG gas.

[0087] In a windless environment, when it is necessary to slow down the discharge of BOG gas, the motor 131 moves, driving the driving screw rod 132 to rotate around its axis. Since the driving screw rod 132 is in transmission connection with the lifting cover 120, the driving screw rod 132 drives the lifting cover 120 to move in a direction closer to the main body 110, thereby reducing the discharge passage 120a to adapt to the discharge amount and discharge speed of BOG gas.

[0088] It should be noted that the installation groove 111c is generally a groove; the motor 131 is generally a motor; the drive screw 132 is generally a round rod, and the outer circumferential surface is provided with a thread. The screw hole 120b is a threaded hole formed by recessing the side of the lifting cover 120 close to the main body 110.

[0089] In at least one embodiment of the present application, the lifting cover 120 is provided with a guide column 121 protruding from one end close to the main body 110;

[0090] The skeleton 111 is also provided with a guide hole 111d, and the guide column 121 is accommodated in the guide hole 111d.

[0091] Please refer to Figures 1-8 In this embodiment, the guide column 121 is used in cooperation with the guide hole 111d, so that the motor 131 drives the drive screw 132 to rotate, so that the lifting cover 120 moves along the length direction of the guide column 121, to ensure the movement trajectory and movement direction of the lifting cover 120.

[0092] The guide column 121 is generally a cylinder, and the guide hole 111d is generally a circular hole.

[0093] In at least one embodiment of the present application, the lifting cover 120 completely blocks the air outlet 110c in the axial direction of the drive screw 132.

[0094] Please refer to Figures 1-8 In this embodiment, since the lifting cover 120 completely blocks the air outlet 110c in the axial direction of the drive screw 132, it can avoid that the external rainwater enters the exhaust passage 110a along the axial direction of the drive screw 132.

[0095] The axis of the drive screw 132 is arranged in the vertical direction.

[0096] In at least one embodiment of the present application, the width of the first air outlet passage 111a is denoted as a, and the width of the second air outlet passage 111b is denoted as b, satisfying the relationship: a>b.

[0097] Please refer to Figures 1-8 In this embodiment, since the widths of the first air outlet passage 111a and the second air outlet passage 111b are different, the gas flow rates in the first air outlet passage 111a and the second air outlet passage 111b are different, thereby improving the exhaust speed of the exhaust gas.

[0098] In at least one embodiment of the present application, the first air outlet passage 111a is two groups, and the second air outlet passage 111b is located between the two groups of first air outlet passages 111a.

[0099] Please refer to Figures 1-8In the embodiment, the second air outlet passage 111b is located between the two groups of first air outlet passages 111a, and a large-small-large pipeline is formed between the air inlet 110b, the first air outlet passage 111a and the air outlet 110c, so that the flow rate is faster, and the width of the second air outlet passage 111b is narrower than that of the first air outlet passage 111a, so that the flow rate in the second air outlet passage 111b is faster than that in the first air outlet passage 111a, to form a flow rate difference, thereby improving the exhaust efficiency of the exhaust gas.

[0100] In at least one embodiment of the present application, the main body 110 comprises:

[0101] The air inlet section 112 is provided with the air inlet 110b;

[0102] The communication section 113 is in communication with one end of the air inlet section 112;

[0103] The air outlet section 114 is provided with the air outlet 110c, and the other end of the communication section 113 is in communication with the air outlet section 114.

[0104] In at least one embodiment of the present application, the air inlet section 112 and the air outlet section 114 are arranged in parallel, and the communication section 113 is inclined to the air inlet section 112.

[0105] Please refer to Figures 1-8 In the embodiment, the communication section 113 is inclined to the air inlet section 112, so that the airflow entering the communication section 113 through the air inlet section 112 changes along with the direction of inclination and the angle of inclination, and rises from the circular section 110e to the elliptical section 110f. Because of the inclination, the cross section of the air inlet section 112 and the communication section 113 in the vertical direction is different, so that a "narrow tube effect" is formed here to increase the flow rate of the gas, which can better improve the flow rate of the exhaust gas in the exhaust passage 110a.

[0106] Combined with the external flow guide part 115, the airflow generated by the windward surface of the flow guide part 115 forms a negative pressure at the flow guide port 115a, and further discharges the BOG gas in the exhaust passage 120a to the outside.

[0107] In at least one embodiment of the present application, the peripheral wall of the air outlet section 114 is provided with a through hole 110d, and the through hole 110d is in communication with the air outlet 110c;

[0108] The LNG ship venting mast 100 further comprises:

[0109] The screen 140 is arranged at the air outlet 110c.

[0110] Please refer to Figures 1-8In the embodiment, the effect of discharging the airflow at the air outlet 110c can be increased by the through hole 110d.

[0111] By installing the blocking net 140 at the air outlet 110c, the foreign matter from outside can be prevented from entering the exhaust passage 110a.

[0112] The above merely illustrates the embodiments of the present application, and it should be pointed out that, for those skilled in the art, improvements can be made without departing from the creative concept of the present application, and these improvements shall fall within the protection scope of the present application.

Claims

1. A gas venting mast for an LNG carrier, characterized in that include: The main body has an exhaust channel, an air inlet, and an air outlet inside. The air inlet and the air outlet are respectively located at both ends of the main body and are connected to each other. A lifting cover is provided on the main body and partially blocks the air outlet along the opening direction of the air outlet. The lifting cover and the main body form an exhaust channel communicating with the air outlet. The lifting drive component is fixed at one end to the main body and connected to the lifting cover at the other end.

2. The LNG ship's gas permeation mast according to claim 1, characterized in that The exhaust channel has a circular segment and an elliptical segment connected to the circular segment. The elliptical segment gradually expands from the end near the circular segment away from the circular segment to form the air outlet. The circular segment is connected to the air inlet.

3. The LNG carrier gas permeation mast according to claim 2, characterized in that The LNG marine ventilated mast also includes: A flow guide is provided on the outer peripheral surface of the main body and located at one end of the main body near the air outlet. The flow guide protrudes outward along the outer peripheral surface away from the main body to form an elliptical protrusion. An arc-shaped flow guide surface protrudes on the side of the flow guide away from the main body. A flow guide port communicating with the air outlet is provided on the flow guide and the flow guide port is located on both sides of the main body.

4. The LNG carrier gas permeation mast of claim 1, wherein, The main body has a frame that divides the exhaust channel into a first exhaust channel and a second exhaust channel.

5. The LNG carrier gas permeation mast according to claim 4, characterized in that The frame is provided with a mounting groove; The lifting drive component includes: The motor is fixedly installed in the mounting slot; A drive screw is installed at the output end of the motor; The lifting cover has a screw hole, and one end of the drive screw is housed in the screw hole and is connected to the lifting cover in a transmission manner.

6. The LNG carrier gas permeation mast according to claim 5, characterized in that A guide post is protruding from one end of the lifting cover near the main body; The frame is also provided with guide holes, and the guide post is housed in the guide holes.

7. The LNG carrier gas permeation mast of claim 5, wherein, In the axial direction of the drive screw, the lifting cover completely blocks the air outlet.

8. The LNG carrier gas permeation mast of claim 4, wherein, The width of the first air outlet channel is denoted as a, and the width of the second air outlet channel is denoted as b, satisfying the relationship: a > b.

9. The LNG carrier gas permeation mast according to claim 8, characterized in that The first air outlet channel consists of two sets, and the second air outlet channel is located between the two sets of the first air outlet channels.

10. The LNG carrier gas permeation mast of claim 1, wherein, The subject includes: The air intake section is provided with the aforementioned air intake port; The connecting section is connected at one end to the air intake section; An air outlet section is provided with an air outlet. The other end of the connecting section is connected to the air outlet section. The air inlet section is arranged parallel to the air outlet section. The connecting section is arranged inclined to the air inlet section. A through-hole is provided on the peripheral wall of the air outlet section. The through-hole is connected to the air outlet. The LNG marine ventilated mast also includes: A barrier net is installed at the air outlet.

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