Vessel

Abstract

To provide a vessel capable of suppressing suction of drain by a gas detector while speedily detecting leaking of gas.SOLUTION: A vessel includes: a hull; fuel tank for retaining liquefied gas as fuel; a main pipe extending from an expansion tank upward including a fuel circulation circuit for having the fuel from the fuel tank circulate and a medium circuit having a medium that exchanges heat with fuel circulating through the fuel circulation circuit as well as having an expansion tank capable of retaining the medium; and further including an air vent pipe opening outside the hull by being connected to the main pipe; a sampling pipe connected to the main pipe and extending upward; and a gas detector connected to a top end of the sampling pipe, suctioning the gas from the sampling pipe, and capable of detecting the fuel contained in the sucked gas.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a ship.

Background Art

[0002] Patent Document 1 discloses a liquefied gas vaporization system. In this liquefied gas vaporization system, a heat source machine and a vaporizer are connected by a circulation path. A high-temperature fluid heated by a combustor of the heat source machine is circulated and supplied into a sealed can body of the vaporizer. Further, liquefied gas is supplied to a coil tube in the vaporizer. In the vaporizer, the liquefied gas is heated by the high-temperature fluid and vaporized.

[0003] Moreover, an expansion tank is provided in the circulation path. A gas detector is provided in an overflow pipe from this expansion tank. When a gas leak occurs in the vaporizer, the leaked gas is mixed into the fluid flowing in the circulation flow path. The gas detector detects the gas leak that has occurred in the vaporizer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in a liquefied gas vaporization system as disclosed in Patent Document 1, drain may occur in the process of gas being sucked into the gas detector. If the generated drain is sucked into the gas detector, it may cause a failure of the gas detector.

[0006] As a countermeasure, for example, there is a method of arranging a gas detector at a position separated from the expansion tank. By doing so, the gas is sufficiently cooled at a position far from the gas detector, and the generation of drain near the gas detector is suppressed. As a result, it is possible to suppress the suction of drain into the gas detector, but there has been a problem that it takes time for the gas to reach the gas detector and the detection of gas leakage is delayed.

[0007] The present disclosure has been made to solve the above problems, and an object thereof is to provide a ship capable of quickly detecting gas leakage while suppressing the suction of drain into a gas detector.

Means for Solving the Problems

[0008] In order to solve the above problems, a ship according to the present disclosure includes a hull, a fuel tank for storing liquefied gas as fuel, a fuel circulation system through which the fuel from the fuel tank circulates, and a medium system having an expansion tank capable of storing a medium through which a medium that exchanges heat with the fuel flowing through the fuel circulation system circulates, and a main pipe extending upward from the expansion tank, an air vent pipe connected to the main pipe and opening to the outside of the hull, a sampling pipe connected to the main pipe and extending upward, and a gas detector connected to the upper end of the sampling pipe for sucking gas from the sampling pipe and detecting the fuel contained in the sucked gas.

Effects of the Invention

[0009] According to the ship of the present disclosure, it is possible to quickly detect gas leakage while suppressing the suction of drain into the gas detector.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0011] (Configuration of the ship) Hereinafter, a ship 1 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the ship 1 includes a hull 2 and an engine plant 10. The ship 1 is capable of sailing by a main engine or the like using liquefied gas G1 as fuel G. Note that the ship type of the ship 1 is not limited to a specific ship type.

[0012] (Hull) The hull 2 includes a hull main body 3, an upper structure 7, and a funnel 8. The hull main body 3 is formed to float on seawater. The hull main body 3 has a bow 3a, a stern 3b, a side 4, a bottom 5, and an exposed deck 6. A pair of sides 4 are provided facing each other left and right so as to connect the bow 3a and the stern 3b. The bottom 5 connects the bow 3a and the stern 3b and also connects the lower ends of the pair of sides 4. The exposed deck 6 connects the bow 3a and the stern 3b and also connects the upper ends of the pair of sides 4.

[0013] The upper structure 7 is formed on the exposed deck 6. Living quarters and the like are provided inside the upper structure 7. The funnel 8 is formed on the exposed deck 6. In order to discharge the exhaust gas of the engine plant 10 described later to the outside of the hull 2, a pipe extending from the engine plant 10 is arranged in the funnel 8.

[0014] (Engine plant) The engine plant 10 is provided inside the hull main body 3. As shown in FIG. 2, the engine plant 10 includes a heat engine 11, a fuel tank 12, a fuel flow system 13, a heat medium system 14, and a second heat medium heater 15.

[0015] (Heat engine) The heat engine 11 is provided inside the hull 2. The heat engine 11 is a main engine or an auxiliary engine that uses, as fuel G, vaporized liquefied gas G1 stored in a fuel tank 12 described later. The waste heat generated in the heat engine 11 is used to heat a first heat medium M1 flowing through a first heat medium system 20 described later.

[0016] (Fuel tank) The fuel tank 12 stores liquefied gas G1 as fuel G for the heat engine 11. The liquefied gas G1 stored in the fuel tank 12 of the present embodiment is LNG (Liquefied Natural Gas).

[0017] (Fuel flow system) The fuel flow system 13 connects the fuel tank 12 and the heat engine 11. Fuel G from the fuel tank 12 flows through the fuel flow system 13. The fuel flow system 13 heat-exchanges fuel G from the fuel tank 12 with a second heat medium M2 flowing through a second heat medium system 30 described later, and supplies the heat-exchanged fuel G to the heat engine 11. In FIG. 2, the flow direction of fuel G in the fuel flow system 13 is illustrated by an arrow. Hereinafter, in the description related to the fuel flow system 13, the upstream side in the flow direction of fuel G may be simply referred to as the upstream side, and the downstream side in the flow direction of fuel G may be simply referred to as the downstream side.

[0018] The fuel circulation system 13 includes a fuel flow path 13a, a pump 16, and a coil tube 17. The fuel flow path 13a connects the fuel tank 12 and the heat engine 11 and allows the fuel G to flow through. Also, a pump 16 for pumping the liquefied gas G1 in the fuel tank 12 is provided at the upstream end of the fuel flow path 13a. In this embodiment, the pump 16 is provided inside the fuel tank 12. The coil tube 17 is provided in the middle part of the fuel flow path 13a. The coil tube 17 is arranged inside the vaporizer 33 of the first medium system 20 described later. The liquefied gas G1 pumped from the fuel tank 12 flows through the coil tube 17. The liquefied gas G1 flowing through the coil tube 17 is heated by the vaporizer 33 and vaporizes.

[0019] The heat engine 11 operates by burning the fuel G supplied from the fuel circulation system 13. At this time, waste heat is generated from the heat engine 11, and this waste heat of the heat engine 11 is used to heat the first medium M1 flowing through the first medium system 20 described later.

[0020] (Medium system) In the medium system 14, a medium M that exchanges heat with the fuel G flowing through the fuel circulation system 13 flows through. In this embodiment, as the medium system 14, there are a first medium system 20 and a second medium system 30. Hereinafter, among the medium M, the medium M flowing through the first medium system 20 is referred to as the first medium M1, and the medium M flowing through the second medium system 30 is referred to as the second medium M2.

[0021] Also, both the first medium system 20 and the second medium system 30 have an expansion tank 50 capable of storing the medium M. Hereinafter, among the expansion tanks 50, the expansion tank 50 belonging to the first medium system 20 is referred to as the first expansion tank 50a, and the expansion tank 50 belonging to the second medium system 30 is referred to as the second expansion tank 50b.

[0022] (First medium system) In the first medium system 20, a first medium M1 that indirectly exchanges heat with fuel G flowing through the fuel circulation system 13 via a second medium M2 described later flows. In FIG. 2, the flow direction of the first medium M1 in the first medium system 20 is illustrated by an arrow. Hereinafter, in the description related to the first medium system 20, the upstream side in the flow direction of the first medium M1 may be simply referred to as the upstream side, and the downstream side in the flow direction of the first medium M1 may be simply referred to as the downstream side for explanation.

[0023] In the present embodiment, cooling fresh water is used as the first medium M1. The first medium system 20 includes a first medium flow path 21, a pump 22, a first medium cooler 24, a valve 25, and a first expansion tank 50a.

[0024] (First medium flow path) The first medium flow path 21 circulates the first medium M1. Various devices such as a pump 22, a jacket 23, a first medium cooler 24, a valve 25, and a second medium heater 15, which will be described later, are provided in the first medium flow path 21. The first medium flow path 21 includes a heat engine cooling flow path 21a and a bypass flow path 21b.

[0025] The heat engine cooling flow path 21a is annularly arranged so as to pass through a jacket 23 attached to the heat engine 11. The heat engine cooling flow path 21a circulates the first medium M1 and cools the heat engine 11 with the first medium M1. In the heat engine cooling flow path 21a, with the pump 22 being the most upstream side, the pump 22, the jacket 23, the second medium heater 15, the valve 25, and the first expansion tank 50a are annularly arranged in this order.

[0026] The bypass flow path 21b branches from the valve 25 of the heat engine cooling flow path 21a. Then, the bypass flow path 21b is arranged between the valve 25 and a first expansion tank 50a described later in the heat engine cooling flow path 21a and returns to the downstream side of the valve 25. A first medium cooler 24 is provided in the bypass flow path 21b.

[0027] The valve 25 is a so-called three-way valve. The valve 25 can switch the first medium flow path 21 so that the first medium M1 passes through the first medium cooler 24. Conversely, the valve 25 can also switch the first medium flow path 21 so that the first medium M1 does not pass through the first medium cooler 24.

[0028] The pump 22 pumps the first medium M1 and circulates it within the first medium system 20. The pump 22 is provided upstream of the heat engine 11 in the flow direction of the first medium M1.

[0029] (Jacket) The jacket 23 is provided upstream of the pump 22 in the flow direction of the first medium M1. The first medium M1 pumped from the pump 22 flows through the jacket 23. The jacket 23 is attached to the heat engine 11. In the jacket 23, the waste heat of the heat engine 11 is transferred to the first medium M1. As a result, the heat engine 11 is cooled. On the other hand, the first medium M1 is heated by absorbing the waste heat of the heat engine 11.

[0030] (First medium cooler) The first medium cooler 24 is provided upstream of the pump 22 in the flow direction of the first medium M1. The first medium cooler 24 cools the first medium M1 before it is supplied to the jacket 23.

[0031] (First expansion tank) The first expansion tank 50a is provided downstream of the first medium cooler 24 in the flow direction of the first medium M1. The first expansion tank 50a temporarily stores the liquid-phase first medium M1 flowing through the first medium system 20. Thereby, the volume change due to the expansion and contraction of the first medium M1 is absorbed. Details of the first expansion tank 50a and the configuration around the first expansion tank 50a will be described later.

[0032] (Second medium heater) The second medium heater 15 is provided so as to span between the first medium system 20 and the second medium system 30 described later. The second medium heater 15 is provided between the jacket 23 and the valve 25 in the first medium system 20, and is provided on the downstream side of the jacket 23 in the flow direction of the first medium M1. The second medium heater 15 heats the second medium M2 by exchanging heat between the first medium M1 heated by the jacket 23 and the second medium M2 flowing through the second medium system 30.

[0033] (Second medium system) In the second medium system 30, the second medium M2 that directly exchanges heat with the fuel G flowing through the fuel flow system 13 flows. In FIG. 2, the flow direction of the second medium M2 in the second medium system 30 is illustrated by an arrow. Hereinafter, in the description related to the second medium system 30, the upstream side in the flow direction of the second medium M2 may be simply referred to as the upstream side, and the downstream side in the flow direction of the second medium M2 may be simply referred to as the downstream side.

[0034] In this embodiment, an antifreeze liquid is used as the second medium M2. The second medium system 30 includes a second medium flow path 31, a pump 32, a vaporizer 33, an auxiliary cooler 34, valves 35, 36, 37, and a second expansion tank 50b.

[0035] (Second medium flow path) The second medium flow path 31 circulates the second medium M2. Various devices such as the second medium heater 15, the second medium flow path 31, the pump 32, the vaporizer 33, the valves 35, 36, 37, and the second expansion tank 50b described later are provided in the second medium flow path 31. The second medium flow path 31 includes a vaporization flow path 31a and bypass flow paths 31b and 31c.

[0036] The vaporization flow path 31a is arranged in a ring shape so as to circulate the second medium M2. In the vaporization flow path 31a, with the second medium heater 15 being the most upstream side, the second medium heater 15, the valve 35, the valve 36, the pump 32, the vaporizer 33, and the second expansion tank 50b are arranged in this order in a ring shape.

[0037] The bypass passage 31b is between the second expansion tank 50b and the second medium heater 15 in the vaporization passage 31a, and branches off from the downstream side with respect to the second expansion tank 50b. The bypass passage 31b is connected to the valve 35 and is arranged to return to the vaporization passage 31a via the valve 35.

[0038] The valve 35 is a so-called three-way valve. The valve 35 can switch the second medium passage 31 so that the second medium M2 passes through the second medium heater 15. Conversely, the valve 35 can switch the second medium passage 31 so that the second medium M2 does not pass through the second medium heater 15.

[0039] The bypass passage 31c is between the valve 35 and the valve 36 in the vaporization passage 31a, and branches off from the downstream side with respect to the valve 35. The bypass passage 31c is between the valve 36 and the pump 32 in the vaporization passage 31a and is arranged to return to the downstream side with respect to the valve 36. The valve 36 is provided so as to be able to open and close the heat engine cooling passage 21a. An auxiliary cooler 34 is provided in the bypass passage 31c. Valves 37 are provided upstream and downstream of the auxiliary cooler 34 in the bypass passage 31c, respectively. This valve 37 is provided so as to be able to open and close the bypass passage 31c.

[0040] By closing the valve 36 and opening the valve 37, the second medium passage 31 can be switched so that the second medium M2 passes through the auxiliary cooler 34. Conversely, by opening the valve 36 and closing the valve 37, the second medium passage 31 can be switched so that the second medium M2 does not pass through the second medium M2 cooler.

[0041] The pump 32 pumps the second medium M2 and circulates it in the second medium system 30. In the present embodiment, the pump 32 is provided on the downstream side in the flow direction of the second medium M2 with respect to the second medium heater 15.

[0042] (Vaporizer) The vaporizer 33 exchanges heat between the liquefied gas G1 stored in the fuel tank 12 and the second medium M2 to vaporize the liquefied gas G1. The vaporizer 33 is provided downstream of the pump 32 in the flow direction of the second medium M2. Inside the vaporizer 33, a coil tube 17 through which the liquefied gas G1 pumped from the fuel tank 12 flows is arranged. Also, the second medium M2 flows inside the vaporizer 33. The liquefied gas G1 and the second medium M2 perform heat exchange through the coil tube 17. As a result, the liquefied gas G1 is vaporized and the second medium M2 is cooled.

[0043] (Second expansion tank) The second expansion tank 50b is provided downstream of the vaporizer 33 in the flow direction of the second medium M2. The second expansion tank 50b temporarily stores the liquid-phase second medium M2 flowing through the second medium system 30. Thereby, the volume change due to the expansion and contraction of the second medium M2 is absorbed. Details of the second expansion tank 50b and the configuration around the second expansion tank 50b will be described later.

[0044] (Configuration of the expansion tank and its surroundings) Hereinafter, the common configuration of the first expansion tank 50a and the second expansion tank 50b and the surrounding configuration thereof will be described with reference to FIGS. 3 and 4. In the following description, the upper side in the vertical direction is denoted by the symbol "Dvu" and the lower side in the vertical direction is denoted by the symbol "Dvd".

[0045] As shown in FIG. 3, the expansion tank 50 has a tank body 51 and a port 52. The liquid-phase medium M is temporarily stored in the tank body 51. The port 52 extends upward from the tank body 51. The gas inside the tank body 51 can be discharged to the outside of the tank body 51 through the port 52. The gas discharged from the port 52 contains the gas of the medium M generated by the evaporation of the medium M temporarily stored in the tank body 51.

[0046] Here, as described above, the expansion tank 50 includes a first expansion tank 50a belonging to the first medium system 20 and a second expansion tank 50b belonging to the second medium system 30. In the first medium system 20, the jacket 23 that exchanges heat between the heat engine 11 and the first medium M1 is separated from the heat engine 11 only by a thin partition wall. Therefore, gas of the fuel G may leak from the heat engine 11 and the leaked gas may be mixed into the first medium M1. Further, in the second medium system 30, in the vaporizer 33 that exchanges heat between the liquefied gas G1 as the fuel G flowing through the fuel flow system 13 and the second medium M2, the liquefied gas G1 and the second medium M2 are separated only by the thin partition wall of the coil tube 17. Therefore, gas of the fuel G may leak and the leaked gas may be mixed into the second medium M2.

[0047] When leaked gas is mixed into the medium M, there is a risk such as the leaked gas catching fire. Therefore, in order to detect the leaked gas mixed into the medium M, in addition to the above-described configuration, the engine plant 10 further includes a gas detection system 18.

[0048] (Gas Detection System) As shown in FIG. 3, the gas detection system 18 of the present embodiment further includes a main pipe 55, an air vent pipe 56, a sampling pipe 60, a gas detector 80, a detection pipe 86, and valves 87 and 88.

[0049] (Main Pipe) The main pipe 55 extends upward from the port 52 of the expansion tank 50. When the central axis of the main pipe 55 is the first axis O1, the first axis O1 extends linearly in the vertical direction. That is, the main pipe 55 is formed to extend linearly in the vertical direction from the expansion tank 50. The main pipe 55 includes a main pipe body 55a and a flange 55b. The main pipe body 55a is formed in a cylindrical shape extending along the first axis O1. Flanges 55b are provided at both upper and lower ends of the main pipe body 55a in the vertical direction.

[0050] (Air Vent Pipe) The vent pipe 56 is connected to the main pipe 55 and opens to the outside. Of the vent pipe 56, the portion located below the exposed deck 6 and inside the hull 2 is defined as the first part 57. Also, of the vent pipe 56, the portion located above the exposed deck 6 and protruding outside the hull 2 is defined as the second part 58.

[0051] If the portion of the first part 57 connected to the main pipe 55 is defined as the connection part 57a, this connection part 57a extends horizontally from the side surface of the first part 57. If the central axis of the connection part 57a is defined as the second axis O2, the angle θ1 between the first axis O1 of the main pipe 55 and the second axis O2 is designed to be 90 degrees.

[0052] The tip 58a of the second part 58 is curved and opens downward. The gas discharged from the expansion tank 50 is guided to the vent pipe 56 through the main pipe 55. Then, this gas flows through the vent pipe 56 and is discharged to the outside from the tip 58a.

[0053] (Sampling pipe) The sampling pipe 60 is connected to the main pipe 55 and extends upward from the upper end of the main pipe 55. In this embodiment, the sampling pipe 60 is formed to extend linearly in the vertical direction. Further, the sampling pipe 60 is arranged on the same axis as the main pipe 55. That is, if the central axis of the sampling pipe 60 is defined as the third axis O3, the third axis O3 is in the same straight line as the first axis O1 of the main pipe 55, and the angle θ2 between the first axis O1 and the third axis O3 is designed to be 0 degrees.

[0054] Also, the sampling pipe 60 is a cooler that cools the gas from the expansion tank 50. As shown in FIG. 4, the sampling pipe 60 includes a sampling pipe body 61, a flange 62, fins 63, a heat transfer promotion part 64, and a discharge port 65.

[0055] The sampling tube body 61 extends upward from the main pipe 55. The sampling tube body 61 is formed in a cylindrical shape extending along the third axis O3. Inside the sampling tube 60, the gas from the expansion tank 50 circulates.

[0056] The flanges 62 are provided at both upper and lower ends of the sampling tube body 61 in the vertical direction. Among the flanges 62 of the sampling tube 60, the lower flange 62 is overlapped with the flange 55b of the main pipe 55 and sealed.

[0057] The fins 63 project radially outward from the outer surface 61a of the sampling tube body 61. A plurality of fins 63 are formed side by side in the circumferential direction of the sampling tube body 61. Each flange 62 is formed in a plate shape extending in the vertical direction. The fins 63 increase the area of the outer surface of the sampling tube 60 and improve the heat dissipation performance of the sampling tube 60.

[0058] The heat transfer promotion part 64 is provided on the sampling tube body 61. The heat transfer promotion part 64 contacts the inner surface 61b of the sampling tube body 61 and promotes the heat transfer between the gas flowing through the sampling tube body 61 and the sampling tube body 61. Examples of the heat transfer promotion part 64 include steel mesh and steel wool.

[0059] The discharge port 65 is attached to the upper flange 62. The discharge port 65 has a lid part 65a and a discharge pipe 65b. The lid parts 65a, 66 are overlapped with the flanges 55b, 62, 72 and sealed. The lid parts 65a, 66 close the openings of the sampling tube body 61. The discharge pipe 65b extends in the vertical direction and penetrates the lid part 65a. The discharge pipe 65b is arranged to extend upward from the lid part 65a. The gas from the expansion tank 50 that has passed through the sampling tube body 61 is discharged to the outside of the sampling tube body 61 through the discharge pipe 65b.

[0060] (Gas detector) The gas detector 80 is connected to the upper end of the sampling pipe 60 via a detection pipe 86 described later. The gas detector 80 is capable of sucking gas from the sampling pipe 60 and detecting the fuel G contained in the sucked gas. When a leakage gas of the fuel G is mixed into the medium M flowing through the medium system 14, the gas detector 80 can immediately detect this gas leakage.

[0061] The detection pipe 86 connects the discharge port 65 of the sampling pipe 60 and the gas detector 80. A valve 87 capable of opening and closing the detection pipe 86 is provided at the end of the detection pipe 86 on the discharge port 65 side. Also, a valve 88 capable of opening and closing the detection pipe 86 is provided at the end of the detection pipe 86 on the gas detector 80 side.

[0062] (Function and effect) In the ship 1 having the above configuration, the following function and effect can be exhibited. In this embodiment, the ship 1 includes a main pipe 55, an air vent pipe 56, sampling pipes 60 and 60A, and a gas detector 80. The main pipe 55 extends upward from the expansion tank 50. The sampling pipe 60 is connected to the main pipe 55 and opens to the outside of the hull 2. The gas detector 80 is connected to the upper end of the sampling pipe 60, sucks gas from the sampling pipe 60, and is capable of detecting the fuel G contained in the sucked gas.

[0063] Since the sampling pipe 60 extends upward from the main pipe 55, even if drain is generated in the sampling pipe 60, the drain is returned into the expansion tank 50 through the main pipe 55. Therefore, it is suppressed that the drain is sucked by the gas detector 80. Furthermore, since it is not necessary to separate the gas detector 80 far from the expansion tank 50, the gas detector 80 can be arranged near the expansion tank 50. Thus, gas is quickly sucked from the expansion tank 50 to the gas detector 80, and it becomes possible to immediately detect gas leakage. Also, when a fuel G with a low specific gravity such as methane is mixed into the medium M, the suction force of the gas detector 80 is added, and the fuel G can be preferentially caught from the sampling pipe 60. Also, by arranging the gas detector 80 near the expansion tank 50, it becomes easier to maintain the gas detector 80.

[0064] The sampling pipe 60 extends upward from the upper end of the main pipe 55.

[0065] It is possible to suppress the drain flowing down the inner surface of the main pipe 55 from entering the sampling pipe 60. Therefore, it is possible to further suppress the drain from being sucked into the gas detector 80.

[0066] The main pipe 55 is formed to extend linearly in the vertical direction from the expansion tank 50, the sampling pipe 60 is formed to extend linearly in the vertical direction, and the sampling pipe 60 is arranged on the same axis as the main pipe 55.

[0067] As a result, gas can move smoothly from the expansion tank 50 to the main pipe 55 and from the main pipe 55 to the sampling pipe 60. Therefore, it is possible to more immediately detect gas leakage.

[0068] The sampling pipes 60, 60A are coolers that cool the gas from the expansion tank 50.

[0069] As a result, it is possible to generate drain in the sampling pipe 60 in advance, drop the drain into the lower expansion tank 50, and then guide the gas to the gas detector 80. Therefore, it is possible to further suppress the drain from being sucked into the gas detector 80.

[0070] The sampling pipe 60 includes a sampling pipe main body 61, fins 63, and a heat transfer promotion part 64. The sampling pipe main body 61 extends upward, and the gas from the expansion tank 50 flows through the sampling pipe main body 61. The fins 63 protrude from the outer surface 61a of the sampling pipe main body 61. The heat transfer promotion part 64 is provided inside the sampling pipe main body 61 and is capable of transferring the heat of the medium M to the sampling pipe main body 61 while allowing the medium M to flow through the inside.

[0071] The fin 63 increases the surface area of the outer surface of the sampling tube 60, improving the heat dissipation performance. Further, the heat transfer promoting part 64 of the present embodiment is made of steel mesh or steel wool, increasing the internal surface area of the sampling tube 60. With these configurations, heat exchange is performed between the gas from the expansion tank 50 flowing inside the sampling tube main body 61 and the outside air of the sampling tube 60, and the gas from the expansion tank 50 can be cooled by air cooling. As a result, the gas (sampling air) inside the sampling tube 60 is cooled to near the outside air temperature of the sampling tube 60. Therefore, the gas from the expansion tank 50 can be cooled by air cooling without introducing another refrigerant M3 into the sampling tube 60. That is, the sampling tube 60 can be provided with a cooling function with simpler equipment.

[0072] Next, a modified example will be described with reference to FIG. 5. In this modified example, as shown in FIG. 5, the sampling tube 60A includes a sampling tube main body 61, a flange 62, a fin 63, a heat transfer promoting part 64, a discharge port 65, a lid part 66, a refrigerant supply part 67, a refrigerant discharge part 68, a tube 69, and a gas tube 70.

[0073] (Sampling tube main body) The sampling tube main body extends in the vertical direction.

[0074] (Lid part) The lid part 66 closes both upper and lower ends of the sampling tube main body 61 in the vertical direction. The lower lid part 66 is overlapped and sealed with the flange 55b of the main pipe 55.

[0075] (Refrigerant supply part) The refrigerant supply unit 67 is provided at the upper part of the sampling tube main body 61. The refrigerant supply unit 67 is provided so as to protrude radially outward from the outer surface 61a of the sampling tube main body 61. The refrigerant supply unit 67 is a tubular member communicating with the sampling tube main body 61. The refrigerant supply unit 67 supplies a refrigerant M3 such as cooling water into the sampling tube main body 61. Note that the refrigerant M3 is not limited to cooling water.

[0076] (Refrigerant discharge part) The refrigerant discharge unit 68 is provided at the lower part of the sampling tube main body 61. The refrigerant discharge unit 68 is provided so as to protrude radially outward from the outer surface 61a of the sampling tube main body 61. The refrigerant discharge unit 68 is a tubular member communicating with the sampling tube main body 61. The refrigerant discharge unit 68 discharges the refrigerant M3 from inside the sampling tube main body 61.

[0077] (Tube) The tube 69 is provided so as to extend in the vertical direction and penetrate through the lid portions 66 on both sides in the vertical direction. The tube 69 allows the gas from the expansion tank 50 to flow inside, and exchanges heat with the refrigerant M3 inside the sampling tube main body 61. The tube 69 in this embodiment includes a coiled tube 69a formed in a coil shape and a linear tube 69b extending linearly in the vertical direction.

[0078] (Gas pipe) The gas pipe 70 is provided above the lid portion 66. The gas pipe 70 has a gas pipe main body 71 and a flange 72. The gas pipe main body 71 is a tubular member extending in the vertical direction. The gas pipe main body 71 is formed to have the same diameter as the sampling tube main body 61. The flanges 72 are provided at both ends in the vertical direction of the gas pipe main body 71. The lower flange 72 is overlapped and sealed with the upper lid portion 66. The upper flange 72 is overlapped and sealed with the lid portion 65a of the discharge port 65.

[0079] (Function and effect) In this modification, the following function and effect can be exhibited. In this modified example, the sampling tube 60A includes a sampling tube main body 61, a lid portion 66, a refrigerant supply portion 67, a refrigerant discharge portion 68, and a tube 69. The sampling tube main body 61 extends upward. The lid portion 66 closes both the upper and lower ends of the sampling tube main body 61 in the vertical direction. The refrigerant supply portion 67 supplies the refrigerant M3 into the sampling tube main body 61. The refrigerant discharge portion 68 discharges the refrigerant M3 from the sampling tube main body 61. The tube 69 is provided so as to extend in the vertical direction and penetrate the lid portions 66 on both sides in the vertical direction, allowing the gas from the expansion tank 50 to flow inside and exchange heat with the refrigerant M3.

[0080] Thereby, the gas from the expansion tank 50 can be cooled by the refrigerant M3 supplied from the outside. Therefore, the gas (sampling air) in the sampling tube 60 can be cooled to the temperature of the refrigerant M3, and the gas from the expansion tank 50 can be efficiently cooled. The sampling air is cooled in the sampling tube 60, and the generated drain drops to the expansion tank 50 along the inner surface of the tube 69.

[0081] (Other Embodiments) As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present disclosure are also included.

[0082] In the above-described embodiment, the case where the primary medium M is cooling fresh water and the secondary medium M is antifreeze has been described. However, the types of the primary medium M and the secondary medium M are not limited to the examples of the embodiment. The types of the primary medium M and the secondary medium M can be appropriately changed.

[0083] In the above-described embodiment, the embodiment has been described by taking the case where the liquefied gas G1 stored in the fuel tank 12 is LNG as an example. However, it is not limited to this. The liquefied gas G1 stored in the fuel tank 12 may be, for example, LPG (Liquefied Petroleum Gas).

[0084] In the above-described embodiment, the angle θ1 between the first axis O1 of the main pipe 55 and the second axis O2 of the connection portion 57a of the air vent pipe 56 is 90 degrees, and the angle θ2 between the first axis O1 of the main pipe 55 and the third axis O3 of the sampling pipes 60 and 60A is 0 degrees. However, each of the angles θ1 and θ2 can be appropriately changed. However, the angle θ2 between the first axis O1 of the main pipe 55 and the third axis O3 of the sampling pipes 60 and 60A is less than 90 degrees, and the sampling pipes 60 and 60A need to extend upward even slightly.

[0085] In the above-described embodiment, the case where the air vent pipe 56 is provided on the side surface of the main pipe 55 and the sampling pipes 60 and 60A are provided at the upper end of the main pipe 55 has been described. However, the present invention is not limited to this. The installation positions of the air vent pipe 56 and the sampling pipes 60 and 60A can be appropriately changed.

[0086] <Supplementary Note> The ship 1 described in each embodiment can be grasped as follows, for example.

[0087] (1) The ship 1 according to the first aspect includes a hull 2, a fuel tank 12 that stores liquefied gas G1 as fuel G, a fuel circulation system 13 through which the fuel G from the fuel tank 12 flows, and a medium system 14 that has an expansion tank 50 through which a medium M that exchanges heat with the fuel G flowing through the fuel circulation system 13 flows and that can store the medium M. The ship 1 further includes a main pipe 55 that extends upward from the expansion tank 50, an air vent pipe 56 that is connected to the main pipe 55 and opens to the outside of the hull 2, sampling pipes 60 and 60A that are connected to the main pipe 55 and extend upward, and a gas detector 80 that is connected to the upper ends of the sampling pipes 60 and 60A, sucks gas from the sampling pipes 60 and 60A, and can detect the fuel G contained in the sucked gas.

[0088] Since the sampling pipes 60 and 60A extend upward from the main pipe 55, even if drain water is generated in the sampling pipes 60 and 60A, the drain water will be returned into the expansion tank 50 through the main pipe 55. Therefore, it is possible to prevent the drain water from being sucked into the gas detector 80. Further, since it is not necessary to separate the gas detector 80 far from the expansion tank 50, the gas detector 80 can be arranged near the expansion tank 50. As a result, gas can be quickly sucked from the expansion tank 50 into the gas detector 80, and gas leakage can be detected immediately.

[0089] (2) The ship 1 of the second aspect is the ship 1 of the first aspect, wherein the sampling pipes 60 and 60A may extend upward from the upper end of the main pipe 55.

[0090] It is possible to prevent the drain water flowing down the inner surface of the main pipe 55 from entering the sampling pipes 60 and 60A.

[0091] (3) The ship 1 of the third aspect is the ship 1 of the first or second aspect, wherein the main pipe 55 is formed to extend linearly in the vertical direction from the expansion tank 50, the sampling pipes 60 and 60A are formed to extend linearly in the vertical direction, and the sampling pipes 60 and 60A may be arranged on the same axis as the main pipe 55.

[0092] This allows gas to move smoothly from the expansion tank 50 to the main pipe 55 and from the main pipe 55 to the sampling pipes 60 and 60A.

[0093] (4) The ship 1 of the fourth aspect is the ship 1 of any one of the first to third aspects, wherein the sampling pipes 60 and 60A may be coolers for cooling the gas from the expansion tank 50.

[0094] This allows drain water to be generated in advance in the sampling pipes 60 and 60A, the drain water to be dropped into the lower expansion tank 50, and then gas to be guided to the gas detector 80.

[0095] (5) The ship 1 of the fifth aspect is the ship 1 of the fourth aspect, wherein the sampling pipe 60 extends upward, and includes a sampling pipe main body 61 through which gas from the expansion tank 50 flows, fins 63 protruding from the outer surface 61a of the sampling pipe main body 61, and a heat transfer promoting part 64 provided inside the sampling pipe main body 61 that allows the gas from the expansion tank to flow through the inside and can transfer the heat of the gas from the expansion tank to the sampling pipe main body 61. Examples of the heat transfer promoting part 64 include steel mesh and steel wool.

[0096] Thereby, heat exchange can be performed between the gas from the expansion tank 50 flowing in the sampling pipe main body 61 and the outside air of the sampling pipe 60, and the gas from the expansion tank 50 can be cooled by air cooling.

[0097] (6) The ship 1 of the sixth aspect is the ship 1 of the fourth aspect, wherein the sampling pipe 60A includes a sampling pipe main body 61 that extends upward, lid parts 66 that close both upper and lower ends of the sampling pipe main body 61 in the vertical direction, a refrigerant supply part 67 that supplies refrigerant M3 into the sampling pipe main body 61, a refrigerant discharge part 68 that discharges the refrigerant M3 from the sampling pipe main body 61, and a tube 69 that extends in the vertical direction and penetrates the lid parts 66 on both sides in the vertical direction, allowing the gas from the expansion tank 50 to flow inside and causing heat exchange with the refrigerant M3.

[0098] Thereby, the gas from the expansion tank 50 can be cooled by the refrigerant M3 supplied from the outside.

Explanation of Reference Numerals

[0099] 1…Ship 2…Hull 3…Hull body 3a…Bow 3b…Stern 4…Side 5…Bottom 6…Exposed deck 7…Superstructure 8…Funnel 10…Engine plant 11…Heat engine 12…Fuel tank 13…Fuel circulation system 13a…Fuel flow path 14…Medium system 15…Second medium heater 16…Pump 17…Coil tube 18…Gas detection system 20…First medium system 21…First medium flow path 21a…Heat engine cooling flow path 21b…Bypass flow path 22…Pump 23…Jacket 24…First medium cooler 25…Valve 30…Second medium system 31…Second medium flow path 31a…Vaporization flow path 31b…Bypass flow path 31c…Bypass flow path 32…Pump 33…Vaporizer 34…Auxiliary cooler 35…Valve 36…Valve 37…Valve 50…Expansion tank 50a…First expansion tank 50b…Second expansion tank 51…Tank body 52…Port 55…Main pipe 55a…Main pipe body 55b…Flange 56…Vent pipe 57…First part 57a…Connection part 58…Second part 58a…Tip part 60…Sampling pipe 60A…Sampling pipe 61…Sampling pipe body 61a…Outer surface 61b…Inner surface 62…Flange 63…Fin 64…Heat transfer promotion part 65…Discharge port 65a…Cover part 65b…Discharge pipe 66…Cover part 67…Refrigerant supply part 68…Refrigerant discharge part 69…Tube 69a…Coil tube 69b…Linear tube 70…Gas pipe 71…Gas pipe body 72…Flange 80…Gas detector 86…Detection pipe 87…Valve 88…Valve G…Fuel G1…Liquefied gas M…Medium M1…First medium M2…Second medium M3…Refrigerant O1…First axis O2…Second axis O3…Third axis θ1…Angle θ2…Angle

Claims

1. A hull, a fuel tank for storing liquefied gas as fuel, a fuel circulation system through which the fuel from the fuel tank flows, a medium system having an expansion tank through which a medium that exchanges heat with the fuel flowing through the fuel circulation system flows and in which the medium can be stored, comprising: a main pipe extending upward from the expansion tank, a vent pipe connected to the main pipe and opening to the outside of the hull, a sampling pipe connected to the main pipe and extending upward, a gas detector connected to the upper end of the sampling pipe, sucking gas from the sampling pipe and capable of detecting the fuel contained in the sucked gas, a ship further comprising the above.

2. The sampling pipe extends upward from the upper end of the main pipe. The ship according to Claim 1.

3. The main pipe is formed to extend linearly in the vertical direction from the expansion tank, The sampling pipe is formed to extend linearly in the vertical direction, The sampling pipe is arranged on the same axis as the main pipe. The ship according to Claim 1 or 2.

4. The ship according to Claim 1 or 2, wherein the sampling pipe is a cooler for cooling the gas from the expansion tank.

5. The sampling pipe has a sampling pipe body extending upward through which the gas from the expansion tank flows, fins protruding from the outer surface of the sampling pipe body, and a heat transfer promoting part provided inside the sampling pipe body, allowing the gas from the expansion tank to flow inside and capable of transferring the heat of the gas from the expansion tank to the sampling pipe body. The ship according to Claim 4 having the above.

6. The sampling pipe has a sampling pipe body extending upward, lid parts closing both upper and lower ends of the sampling pipe body in the vertical direction, a refrigerant supply part for supplying refrigerant into the sampling pipe body, a refrigerant discharge part for discharging the refrigerant from the sampling pipe body, and a tube extending in the vertical direction and penetrating the lid parts on both sides in the vertical direction, allowing the gas from the expansion tank to flow inside and exchanging heat with the refrigerant. The ship according to Claim 4 having the above.

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