A liquefied gas leakage diversion device suitable for a liquefied gas ship and a liquefied gas ship

Abstract

The present invention provides a liquefied gas leakage diversion device suitable for a liquefied gas ship and a liquefied gas ship, comprising a diversion pipe, an alarm system and a sealing system. The alarm system comprises a spring a, a metal connecting rod and an alarm circuit. The fixed end of the spring a is located on the inner wall of the diversion pipe, and the free end thereof is connected to the middle of the metal connecting rod. The alarm circuit comprises a positive terminal and a negative terminal, a power supply and an alarm light. The sealing system comprises a spring b, a filling body and a magnetic ring. The spring b is connected to the front end face of the filling body. A through hole is provided in the middle of the magnetic ring, and the magnetic ring is magnetically connected to the rear end face of the filling body, and the filling body can seal the central through hole of the magnetic ring. The present invention automatically sounds an alarm when a gas leaks by setting an alarm system, and the sealing system automatically opens for diversion, and the sealing system can effectively seal the leakage channel under normal conditions, thereby greatly improving the safety performance of the liquefied gas ship and reducing potential risks.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a liquefied gas leakage diversion device suitable for a liquefied gas ship and a liquefied gas ship. Background Art

[0002] A liquefied gas carrier is a ship specially used to transport volatile, flammable and explosive gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). The design and construction of such ships must strictly follow the safety standards set by the International Maritime Organization (IMO) and other organizations to ensure that the liquefied gas will not leak due to temperature rise or pressure changes during transportation. However, in actual operation, there is still a risk of leakage of liquefied gas in liquefied gas carriers. Once a leak occurs, it will cause serious pollution to the environment and may cause accidents such as fire and explosion, posing a great threat to the safety of people on board and the surrounding sea areas.

[0003] At present, the treatment method for liquefied gas leakage is usually to install a diversion device to guide the leaked gas into a special collection system. However, the existing diversion devices have obvious shortcomings: on the one hand, they often lack an effective alarm mechanism and cannot promptly remind the crew to take emergency measures; on the other hand, since these diversion devices are usually in a normally open state, the leakage channel cannot be effectively sealed, and external humid air can easily enter, which in turn causes moisture corrosion of the internal structure of the liquid cargo tank, increasing maintenance costs and safety hazards. Summary of the invention

[0004] In view of the problem that the existing diversion device does not have an alarm function and a sealing structure, the present invention provides a liquefied gas leakage diversion device suitable for a liquefied gas ship and a liquefied gas ship. By setting an alarm system, an alarm is automatically sounded in case of gas leakage, and the sealing system is automatically opened for diversion. Under normal conditions, the sealing system can effectively seal the leakage channel, thereby greatly improving the safety performance of the liquefied gas ship and reducing potential risks.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A liquefied gas leakage diversion device suitable for a liquefied gas ship, comprising a diversion pipe, an alarm system and a sealing system; the liquefied gas is loaded in a liquid cargo tank, an insulating layer is provided between the liquid cargo tank and the hull of the liquefied gas ship, and a liquefied gas leakage channel is formed between the insulating layer and the liquid cargo tank;

[0007] One end of the guide pipe is connected to the liquefied gas leakage channel, and the other end is connected to the liquefied gas recovery device;

[0008] The alarm system comprises a spring a, a metal connecting rod and an alarm circuit; the fixed end of the spring a is located on the inner wall of the guide tube, and the free end thereof is connected to the middle of the metal connecting rod; the inner walls of the guide tube on both sides of the metal connecting rod are provided with slide grooves along the airflow direction, and the two ends of the metal connecting rod are respectively located in the slide grooves on both sides; the alarm circuit comprises a positive electrode terminal and a negative electrode terminal respectively arranged at the ends of the slide grooves on both sides along the airflow direction, and a power supply and an alarm light connected in series with the positive electrode terminal and the negative electrode terminal through electric wires;

[0009] The sealing system is located in the guide tube behind the alarm system, and includes a spring b, a filling body and a magnetic ring; the fixed end of the spring b is located on the inner wall of the guide tube, and the free end thereof is connected to the front end face of the filling body; the magnetic ring is installed on the inner wall of the guide tube, and a through hole is provided in the middle thereof, and the magnetic ring is used to separate the guide tubes on the front and rear sides so that the airflow can only flow to the guide tube at the rear through the through hole; the magnetic ring is magnetically connected to the rear end face of the filling body, and the filling body is adsorbed on the surface of the magnetic ring under the action of magnetic force and can seal the central through hole of the magnetic ring.

[0010] Furthermore, it also includes an explosion-proof system arranged between the alarm system and the sealing system / between the alarm system and the liquid inlet of the guide tube, and the explosion-proof system includes a spring c, a piston rod, a mounting seat, an air storage tank and a vacuum pump; the mounting seat is arranged on the outer wall of the guide tube, and has a accommodating cavity inside; the spring c is placed in the accommodating cavity; the guide tube is provided with an opening connected to the accommodating cavity, the piston rod is slidably installed in the cavity formed by the accommodating cavity and the opening, and the bottom of the piston rod abuts against the free end of the spring c; the mounting seat is provided with a through-gas discharge channel, and the air storage tank is discharged through the gas discharge channel. The channel is connected with the accommodating chamber pipeline; in the initial state, the piston rod can separate the inner cavity of the guide tube from the accommodating chamber, and after the air pressure in the guide tube reaches the threshold, the piston rod compresses the spring c downward and exposes the air leakage channel, so that the air flow in the guide tube can enter the gas storage tank along the air leakage channel; the input end of the vacuum pump is connected with the accommodating chamber, and the output end of the vacuum pump is connected with the guide tube in front of the liquefied gas recovery device; the button switch of the vacuum pump is arranged in the accommodating chamber, and when the piston rod compresses the spring c downward and exposes the air leakage channel, the end of the piston rod can just touch the button switch and start the vacuum pump.

[0011] Furthermore, the material of the spring a and the spring b is low-temperature aluminum alloy.

[0012] Furthermore, the guide tube is provided with a heat-insulating layer outside; and the end surface of the piston rod close to the spring c is provided with a heat-insulating layer structure.

[0013] Furthermore, a one-way valve is provided on the pipeline connecting the output end of the vacuum pump and the flow guide pipe, so that the airflow can only be transported from the output end of the vacuum pump to the flow guide pipe.

[0014] Furthermore, the metal connecting rod is in a "T" shape.

[0015] Furthermore, in the initial state, the distance between the two ends of the metal connecting rod and the positive electrode terminal and the negative electrode terminal is less than the cold contraction amount of spring a at the liquefied gas temperature; in the initial state, the spring b is in a compressed state, and the compression amount is less than the cold contraction amount of spring b at the liquefied gas temperature.

[0016] Furthermore, the number of the springs b is not less than 2 and they are distributed in a ring shape on the inner wall of the flow guide tube.

[0017] Furthermore, the guide pipe includes a curved pipe portion and a straight pipe portion, one end of the curved pipe portion is connected to the liquefied gas leakage channel, and the other end is connected to one end of the straight pipe portion, and the other end of the straight pipe portion is connected to the liquefied gas recovery device. The curved pipe portion and the straight pipe portion are connected by a flange, and the pipe diameter at the connection between the two is larger than the pipe diameter of the remaining parts, thereby forming a cavity at the connection for accommodating the sealing system.

[0018] A liquefied gas carrier comprising the liquefied gas leakage diversion device as described in any one of the above items.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. When the liquefied gas leakage diversion device of the present invention encounters a liquefied gas leak, the leaked gas enters the diversion tube, and the spring a contracts when encountering the low-temperature liquefied gas, pulling the metal connecting rod to slide along the slide slot until the two ends of the metal connecting rod contact the positive electrode terminal and the negative electrode terminal respectively, thereby forming a closed circuit and triggering the alarm light to light up. This design realizes the instant detection and alarm of liquefied gas leakage, improves the reaction speed, and helps to take timely countermeasures.

[0021] 2. When the liquefied gas leakage diversion device of the present invention is in a non-leaking state, the filling body in the sealing system fits tightly with the magnetic ring under the adsorption effect of the magnetic ring and the abutment effect of the spring b, thereby sealing the central through hole of the magnetic ring and playing a good sealing role, preventing external humid air from entering the liquefied gas leakage channel and reducing the risk of moisture corrosion in the liquid cargo tank.

[0022] 3. When the liquefied gas leakage diversion device of the present invention detects liquefied gas leakage, the temperature of the magnetic ring decreases, the magnetism weakens, and the adsorption effect on the filling body is weakened. At the same time, the spring b contracts when encountering low-temperature liquefied gas, which will pull the filling body away from one side of the magnetic ring, thereby exposing the central through hole of the magnetic ring. This design ensures that the leaked gas can be collected in a timely and effective manner, avoiding environmental pollution.

[0023] 4. The present invention utilizes an explosion-proof system. When the leakage of liquefied gas is large, the air pressure in the guide tube rises rapidly. Since the sealing system cannot respond quickly and open the central through hole of the magnetic ring, there is a risk of explosion of the guide tube. By setting up an explosion-proof system, the air leakage channel can be opened with the help of the force of air pressure when the central through hole of the magnetic ring is not opened, and the stagnant airflow can be quickly passed into the guide tube behind the magnetic ring with the help of a vacuum pump, thereby eliminating the risk of explosion of the guide tube due to excessive air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the liquefied gas leakage diversion device of the present invention.

[0025] The reference numerals are as follows:

[0026] 1- flow guide pipe; 2- cargo tank; 3- insulation layer; 4- liquefied gas leakage channel; 5- spring a; 6- metal connecting rod; 7- slide groove; 8- positive terminal; 9- negative terminal; 10- power supply; 11- alarm light; 12- spring b; 13- filling body; 14- magnetic ring; 15- spring c; 16- piston rod; 17- mounting seat; 18- gas storage tank; 19- vacuum pump; 20- air leakage channel; 21- push button switch; 22- one-way valve. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0028] The liquefied gas leakage diversion device for liquefied gas ships in this embodiment includes a diversion pipe 1, an alarm system, a sealing system and an explosion-proof system. The liquefied gas is loaded in a liquid cargo tank 2, and an insulating layer 3 is provided between the liquid cargo tank 2 and the hull of the liquefied gas ship. A liquefied gas leakage channel 4 is formed between the insulating layer 3 and the liquid cargo tank 2. Figure 1 It is a schematic diagram of the structure of the liquefied gas leakage diversion device described in this embodiment.

[0029] The guide pipe 1 includes a curved pipe part and a straight pipe part, one end of the curved pipe part is connected to the liquefied gas leakage channel 4, and the other end is connected to one end of the straight pipe part, and the other end of the straight pipe part is connected to the liquefied gas recovery device (not shown in the figure), and the curved pipe part and the straight pipe part are connected by a flange, and the pipe diameter at the connection between the two is larger than the pipe diameter of the other parts, so that a cavity for accommodating the sealing system is formed at the connection. The guide pipe 1 has an insulation layer on the outside.

[0030] The alarm system includes a spring a5, a metal connecting rod 6 and an alarm circuit. The fixed end of the spring a5 is located on the inner wall of the flow guide tube 1, and the free end thereof is connected to the middle of the metal connecting rod 6. The metal connecting rod 6 is in a "T" shape, and a slide groove 7 along the airflow direction is provided on the inner wall of the flow guide tube 1 on both sides of the metal connecting rod 6, and the two ends of the metal connecting rod 6 are respectively located in the slide grooves 7 on both sides. The alarm circuit includes a positive electrode terminal 8 and a negative electrode terminal 9 respectively arranged at the ends of the slide grooves 7 on both sides along the airflow direction, and a power supply 10 and an alarm light 11 connected in series with the positive electrode terminal 8 and the negative electrode terminal 9 through electric wires. In the initial state, the two ends of the metal connecting rod 6 do not contact the positive electrode terminal 8 and the negative electrode terminal 9, and the distance between the two ends of the metal connecting rod 6 and the positive electrode terminal 8 and the negative electrode terminal 9 in the initial state is less than the cold contraction amount of the spring a5 at the liquefied gas temperature. When the spring a5 contracts when cold, it can apply a pulling force to the metal connecting rod 6 in the same direction as the airflow. Under the action of the pulling force, the metal connecting rod 6 slides along the slide grooves 7 on both sides and can contact the positive electrode terminal 8 and the negative electrode terminal 9.

[0031] The sealing system is located in the guide tube 1 behind the alarm system, and includes a spring b12, a filling body 13 and a magnetic ring 14. The fixed end of the spring b12 is located on the inner wall of the guide tube 1, and its free end is connected to the front end face of the filling body 13; the magnetic ring 14 is installed on the inner wall of the guide tube 1, and a through hole is opened in the middle. The magnetic ring 14 is used to separate the guide tubes 1 on the front and rear sides, so that the airflow can only flow to the guide tube 1 at the rear through the through hole; the magnetic ring 14 is magnetically connected to the rear end face of the filling body 13, and the filling body 13 is adsorbed on the surface of the magnetic ring 14 under the action of magnetic force and can seal the central through hole of the magnetic ring 14. In the initial state, the spring b12 is in a compressed state, and the compression amount is less than the cold contraction amount of the spring b12 at the liquefied gas temperature, so that the spring b12 can exert a force on the filling body 13 away from the magnetic ring 14 after cold contraction.

[0032] The explosion-proof system is arranged between the alarm system and the sealing system, and includes a spring c15, a piston rod 16, a mounting seat 17, an air storage tank 18 and a vacuum pump 19. The mounting seat 17 is arranged on the outer wall of the guide tube 1, and has a accommodating chamber inside. The spring c15 is placed in the accommodating chamber. The guide tube 1 is provided with an opening connected to the accommodating chamber, and the piston rod 16 is slidably installed in the cavity formed by the accommodating chamber and the opening, and its bottom abuts against the free end of the spring c15. The end surface of the piston rod 16 close to the spring c15 is provided with an insulation layer structure, which is used to prevent the spring c15 from shrinking due to the influence of the low-temperature liquefied gas in the guide tube 1. The mounting seat 17 is provided with a through-flowing air release channel 20, and the air storage tank 18 is connected to the accommodating chamber pipeline through the air release channel 20. In the initial state, the piston rod 16 can separate the inner cavity of the guide tube 1 from the receiving cavity. When the air pressure in the guide tube 1 reaches the threshold, the piston rod 16 compresses the spring c15 downward and exposes the air release channel 20, so that the airflow in the guide tube 1 can enter the gas storage tank 18 along the air release channel 20. The input end of the vacuum pump 19 is connected to the receiving cavity, and the output end of the vacuum pump 19 is connected to the guide tube 1 in front of the liquefied gas recovery device. A one-way valve 22 is provided on the pipeline connecting the output end of the vacuum pump 19 and the guide tube 1, so that the airflow can only be transported to the guide tube 1 from the output end of the vacuum pump 19 to avoid damaging the sealing performance of the guide tube 1. The button switch 21 of the vacuum pump 19 is set in the receiving cavity. When the piston rod 16 compresses the spring c15 downward and exposes the air release channel 20, the end of the piston rod 16 can just touch the button switch 21 and start the vacuum pump 19.

[0033] The material of the spring a5 and the spring b12 is a low-temperature aluminum alloy, which can maintain its mechanical properties in a low-temperature environment and is not prone to embrittlement or breakage. Since the operating temperature of a liquefied gas ship is usually low, the use of a low-temperature aluminum alloy can ensure that the spring still has good elasticity and reliability under low-temperature conditions. In addition, the shrinkage rate of the low-temperature aluminum alloy at low temperatures will increase significantly, which meets the design requirements of the present invention for the spring to shrink when cooled.

[0034] Furthermore, the number of the springs b12 is not less than 2 and they are distributed in a ring shape on the inner wall of the flow guide tube 1. The multiple springs b12 shrink when cooled, and the filling body 13 can be separated from the magnetic ring 14 more easily.

[0035] Furthermore, the present embodiment also relates to a liquefied gas ship comprising the above-mentioned liquefied gas leakage diversion device.

[0036] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A liquefied gas leakage diversion device suitable for a liquefied gas ship, characterized in that: It comprises a flow guide pipe (1), an alarm system, an explosion-proof system and a sealing system; the liquefied gas is loaded in a liquid cargo tank (2); an insulating layer (3) is provided between the liquid cargo tank (2) and the hull of the liquefied gas ship; a liquefied gas leakage channel (4) is formed between the insulating layer (3) and the liquid cargo tank (2); One end of the flow guide pipe (1) is in communication with the liquefied gas leakage channel (4), and the other end is connected to the liquefied gas recovery device; The alarm system comprises a spring a (5), a metal connecting rod (6) and an alarm circuit; the fixed end of the spring a (5) is located on the inner wall of the guide tube (1), and the free end thereof is connected to the middle part of the metal connecting rod (6); the inner wall of the guide tube (1) on both sides of the metal connecting rod (6) is provided with slide grooves (7) along the airflow direction, and the two ends of the metal connecting rod (6) are respectively located in the slide grooves (7) on both sides; the alarm circuit comprises a positive electrode terminal (8) and a negative electrode terminal (9) respectively arranged at the ends of the slide grooves (7) on both sides along the airflow direction, and a power source (10) and an alarm light (11) connected in series with the positive electrode terminal (8) and the negative electrode terminal (9) through electric wires; The sealing system is located in the guide tube (1) behind the alarm system, and comprises a spring b (12), a filling body (13) and a magnetic ring (14); the fixed end of the spring b (12) is located on the inner wall of the guide tube (1), and the free end thereof is connected to the front end surface of the filling body (13); the magnetic ring (14) is installed on the inner wall of the guide tube (1), and a through hole is provided in the middle thereof, and the magnetic ring (14) is used to separate the guide tubes (1) on the front and rear sides so that the airflow can only flow to the guide tube (1) at the rear through the through hole; the magnetic ring (14) is magnetically connected to the rear end surface of the filling body (13), and the filling body (13) is adsorbed on the surface of the magnetic ring (14) under the action of magnetic force and can seal the central through hole of the magnetic ring (14); in the initial state, the spring b (12) is in a compressed state, and the compression amount is less than the cold contraction amount of the spring b (12) at the temperature of liquefied gas; The explosion-proof system is arranged between the alarm system and the sealing system / between the alarm system and the liquid inlet of the guide tube (1), and comprises a spring c (15), a piston rod (16), a mounting seat (17), an air storage tank (18) and a vacuum pump (19); the mounting seat (17) is arranged on the outer wall of the guide tube (1), and has an accommodating cavity inside; the spring c (15) is placed in the accommodating cavity; the guide tube (1) is provided with an opening connected to the accommodating cavity, the piston rod (16) is slidably mounted in the cavity formed by the accommodating cavity and the opening, and the bottom of the piston rod (16) abuts against the free end of the spring c (15); the mounting seat (17) is provided with a penetrating air leakage channel (20), and the air storage tank (18) is connected to the accommodating cavity pipeline through the air leakage channel (20); the initial state In the state, the piston rod (16) can separate the inner cavity of the guide tube (1) from the accommodating cavity, and when the air pressure in the guide tube (1) reaches a threshold value, the piston rod (16) compresses the spring c (15) downwards and exposes the air leakage channel (20), so that the air flow in the guide tube (1) can enter the gas storage tank (18) along the air leakage channel (20); the input end of the vacuum pump (19) is connected to the accommodating cavity, and the output end of the vacuum pump (19) is connected to the guide tube (1) in front of the liquefied gas recovery device; the button switch (21) of the vacuum pump (19) is arranged in the accommodating cavity, and when the piston rod (16) compresses the spring c (15) downwards and exposes the air leakage channel (20), the end of the piston rod (16) can just touch the button switch (21) and start the vacuum pump (19).

2. The liquefied gas leakage diversion device according to claim 1, characterized in that: The material of the spring a (5) and the spring b (12) is low-temperature aluminum alloy.

3. The liquefied gas leakage diversion device according to claim 1, characterized in that: The guide tube (1) has a heat-insulating layer on the outside; and the end surface of the piston rod (16) close to the spring c (15) is provided with a heat-insulating layer structure.

4. The liquefied gas leakage diversion device according to claim 1, characterized in that: A one-way valve (22) is provided on the pipeline connecting the output end of the vacuum pump (19) and the flow guide pipe (1), so that the airflow can only be transported from the output end of the vacuum pump (19) to the flow guide pipe (1).

5. The liquefied gas leakage diversion device according to claim 1, characterized in that: The metal connecting rod (6) is in a "T" shape.

6. The liquefied gas leakage diversion device according to claim 1, characterized in that: In the initial state, the distance between the two ends of the metal connecting rod (6) and the positive electrode terminal (8) and the negative electrode terminal (9) is less than the cold contraction amount of the spring a (5) at the temperature of the liquefied gas.

7. The liquefied gas leakage diversion device according to claim 1, characterized in that: The number of the springs b (12) is no less than 2 and they are distributed in a ring shape on the inner wall of the flow guide tube (1).

8. The liquefied gas leakage diversion device according to claim 1, characterized in that: The flow guide pipe (1) comprises a curved pipe portion and a straight pipe portion, one end of the curved pipe portion is connected to the liquefied gas leakage channel (4), and the other end is connected to one end of the straight pipe portion, and the other end of the straight pipe portion is connected to the liquefied gas recovery device. The curved pipe portion and the straight pipe portion are connected by a flange, and the pipe diameter at the connection between the two is larger than the pipe diameter at other parts, thereby forming a cavity at the connection for accommodating the isolation system.

9. A liquefied gas carrier comprising the liquefied gas leakage diversion device according to any one of claims 1 to 8.

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