Vessel

Abstract

To further suppress retention of ammonia inside a vent post and in its vicinity.SOLUTION: A vessel includes: a hull; an ammonia present part that is provided in the hull and in which ammonia exists; a vent post having a vent post body that forms a cylindrical shape extending upward from the hull and discharges ammonia from the ammonia present part from below to above, and a rain receiving part provided inside the vent post body; and an air supply part that supplies air from outside the vent post to a position above the rain receiving part in the vent post.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to marine vessels. [Background technology]

[0002] A vent post is provided in a ship carrying fuel for propulsion of the ship or flammable gas as cargo to release the flammable gas into the atmosphere outside the ship. Even when ammonia is carried as fuel for propulsion of the ship or cargo, it is possible that the ammonia may be released into the atmosphere through the vent post in the event of an excessive increase in the pressure of the liquefied gas. Incidentally, ammonia dissolves more easily in the moisture in the air than other combustible gases. When ammonia gas dissolves in the moisture in the air, it becomes mist-like ammonia water, and its specific gravity becomes greater than that of the atmosphere. For this reason, the mist-like ammonia water may not be released smoothly from inside the vent post. Even if it can be released to the outside, it may remain near the vent post and not be sufficiently diffused.

[0003] In response to this, for example, Patent Document 1 discloses a configuration including a vent post that releases ammonia in the ammonia-containing portion together with a gas that is non-reactive with ammonia and is pumped by a gas pumping portion to the atmosphere. In such a configuration, ammonia is diluted by mixing the ammonia with the gas, and the ammonia concentration can be reduced. Patent Document 1 also includes a jet generating device that uses a non-reactive gas as a driving fluid to attract ammonia in the ammonia-containing portion. An ejector effect is produced inside the jet generating device, and ammonia can be attracted into the jet generating device, and the gas as a jet can be forcefully released to the outside of the vent post together with ammonia while diluting the ammonia. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-156543 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, even in the configuration described in Patent Document 1, there is a possibility that ammonia may remain inside and near the vent post. Therefore, it is desirable to further suppress the retention of ammonia inside and near the vent post.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship that can further prevent ammonia from remaining inside and in the vicinity of a vent post. [Means for solving the problem]

[0007] In order to solve the above problems, the ship according to the present disclosure comprises a hull, an ammonia presence section, a vent post, and an air supply section. The ammonia presence section is provided in the hull, and ammonia is present in the ammonia presence section. The vent post has a vent post main body and a rain receiving section. The vent post main body is tubular and extends upward from the hull. The vent post main body discharges ammonia from the ammonia presence section from below to above. The rain receiving section is provided within the vent post main body. The air supply section supplies air from outside the vent post to above the rain receiving section within the vent post.

[0008] The vessel according to the present disclosure comprises a hull, an ammonia presence section, a vent post, an inner water supply section, and an air supply section. The ammonia presence section is provided in the hull, and ammonia is present therein. The vent post has a cylindrical shape extending upward from the hull. The vent post discharges ammonia from the ammonia presence section from below to above. The inner water supply section is capable of supplying water into the vent post. The air supply section supplies air from outside the vent post to above the inner water supply section within the vent post. Effect of the Invention

[0009] According to the ship of the present disclosure, it is possible to further prevent ammonia from accumulating inside and near the vent post. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a side view of a floating body equipped with a vessel according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view of a vent post provided in the vessel according to the first embodiment of the present disclosure. [Diagram 3] 2 is a diagram showing a configuration of a water discharge section provided in a marine vessel according to a first embodiment of the present disclosure. FIG. [Figure 4] FIG. 11 is a cross-sectional view of a vent post provided in a vessel according to a second embodiment of the present disclosure. [Diagram 5] FIG. 11 is a diagram showing a configuration of a water discharge section provided in a marine vessel according to a second embodiment of the present disclosure. [Figure 6] FIG. 13 is a cross-sectional view of a bent post according to a first modified example of an embodiment of the present disclosure. [Figure 7] FIG. 13 is a plan view of a bent post according to a second modified example of an embodiment of the present disclosure. [Figure 8] FIG. 11 is a cross-sectional view of a bent post according to a third modified example of an embodiment of the present disclosure. [Figure 9] FIG. 11 is a cross-sectional view of a bent post according to a fourth modified example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First Embodiment Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 9. FIG. As shown in Fig. 1, the ship 1 of this embodiment includes a hull 2, a superstructure 4, a tank 10 as a tank location section, and a vent post 30A. The type of ship 1 is not limited to a specific one. Examples of the type of ship 1 include a liquefied gas carrier, a ferry, a RORO ship, a car carrier, and a passenger ship.

[0012] The hull 2 ​​is formed so as to float on seawater or the like. The hull 2 ​​has a pair of side panels 5A, 5B that form its outer hull, and a ship bottom 6. The side panels 5A, 5B each have a pair of side shell plates that form the starboard and port sides, respectively. The ship bottom 6 has a ship bottom shell plate that connects the side panels 5A, 5B.

[0013] The hull 2 ​​further includes an upper deck 7, which is a full-length deck located at the topmost level. The superstructure 4 is formed on this upper deck 7. In the ship 1 of this embodiment, for example, a cargo space (not shown) for carrying cargo is provided closer to the bow 2a in the bow-stern direction FA than the superstructure 4.

[0014] An internal combustion engine 8 is provided inside the hull 2. The internal combustion engine 8 is used as a main engine for propelling the ship 1, a generator for supplying electricity to the inside of the ship, etc. In this embodiment, the internal combustion engine 8 operates using ammonia stored in a tank 10 as fuel.

[0015] The tank 10 stores liquefied ammonia. The tank 10 is an ammonia-containing section in which ammonia exists. In this embodiment, the tank 10 is illustrated as being disposed on the upper deck 7 on the stern 2b side in the bow-stern direction FA relative to the superstructure 4. The location of the tank 10 is not limited to the above location. For example, the tank 10 may be provided inside the hull 2. The tank 10 and the internal combustion engine 8 are connected via a piping system 20. Ammonia supplied from the tank 10 to the internal combustion engine 8 flows through the piping system 20.

[0016] FIG. 2 is a cross-sectional view of a vent post provided in a vessel according to a first embodiment of the present disclosure. The vent post 30A is provided on the upper deck 7 of the hull 2. As shown in FIG. 2, the vent post 30A includes a vent post body 31, a rain receiving portion 35, an air supply portion 40A, and an outer water supply portion 50.

[0017] The vent post body 31 extends in the vertical direction Dv on the upper deck 7. The vent post body 31 is cylindrical and extends in the vertical direction Dv, and has an opening 31a at its upper part. A vent pipe 33 is connected to the lower part of the vent post body 31. The vent pipe 33 is connected to the tank 10 via a safety valve (not shown). When the pressure in the tank 10 rises above a standard and the safety valve opens, gas containing ammonia released from the tank 10 flows into the vent pipe 33. The vent post body 31 allows the gas containing ammonia introduced from the vent pipe 33 to flow from the bottom to the top, and releases it into the atmosphere from the opening 31a at the top.

[0018] The rain receiving portion 35 is provided in the vent post body 31. The rain receiving portion 35 is provided below the opening 31a, and receives rainwater that has entered the vent post body 31 from the opening 31a. In this embodiment, the rain receiving portion 35 is funnel-shaped with a diameter that narrows downward. A drain pipe 36 is connected to the rain receiving portion 35. The drain pipe 36 discharges the rainwater received by the rain receiving portion 35 to the outside of the vent post body 31. In this way, the rain receiving portion 35 prevents ammonia from reacting with the rainwater inside the vent post body 31.

[0019] The air supply unit 40A supplies air from outside the vent post 30A into the vent post body 31 of the vent post 30A. In this embodiment, the air supply unit 40A supplies air to above the rain receiving portion 35 and below the opening 31a in the vent post 30A. The air supply unit 40A includes an air compression supply unit 41 and a supply pipe 43A.

[0020] The air pumping unit 41 takes in air from outside the vent post 30A, pressurizes it, and pumps it to the supply pipe 43A. The air pumping unit 41 may be, for example, a fan or a blower (hereinafter simply referred to as a fan). In the embodiment of the present disclosure, the fan, which is the air pumping unit 41, uses a turbine (seawater-driven machine) 42 as a driving source. The turbine 42 drives the air pumping unit 41 by taking in seawater from the outside of the hull 2 ​​through a water intake pipe 44 and feeding the seawater pressurized by a pump (not shown). Take in. The turbine 42 is driven by the seawater taken in through the water intake pipe 44, and discharges the seawater used for driving through a discharge pipe 45A. The fan, which is the air pumping unit 41, is connected to the turbine shaft of the turbine 42 through a connecting shaft 46, and is rotated and driven together with the turbine shaft that rotates when taking in seawater.

[0021] The supply pipe 43A ejects pressurized air, which is delivered from the fan, which is the air compression unit 41, into the vent post body 31. For this reason, the supply pipe 43A penetrates from the outside to the inside of the vent post body 31 above the rain receiving portion 35 and below the opening 31a. The tip 43s of the supply pipe 43A opens in the vent post body 31. In the embodiment of the present disclosure, the tip 43s of the supply pipe 43A opens upward. As a result, the air compressed by the fan, which is the air compression unit 41, is ejected upward from the tip 43s of the supply pipe 43A in the vent post body 31.

[0022] The outer water supply unit 50 is provided on the outer side of the upper part of the vent post 30A. The outer water supply unit 50 can supply water to the outside of the vent post 30A. The outer water supply unit 50 includes, for example, a water supply pipe 51 and a plurality of nozzles 52. The water supply pipe 51 supplies the water to be supplied to the outside of the vent post 30A to the plurality of nozzles 52. In the embodiment of the present disclosure, the water supply pipe 51 is connected to the discharge pipe 45A of the turbine 42 via a connection pipe 53. The water supply pipe 51 supplies a portion of the seawater discharged from the turbine 42 to the discharge pipe 45A to the plurality of nozzles 52. The remainder of the seawater discharged from the turbine 42 to the discharge pipe 45A is discharged to the outside of the hull 2 ​​through the discharge pipe 45A.

[0023] The nozzles 52 are provided at intervals on the water supply pipe 51. The nozzles 52 are provided, for example, on the outer side of the upper part of the vent post 30A. Each of the nozzles 52 sprays water supplied through the water supply pipe 51 downward. The water sprayed from the nozzles 52 falls around the vent post 30A due to gravity. When ammonia discharged from the opening 31a is present around the vent post 30A, the water droplets sprayed from the nozzles 52 come into contact with the ammonia and absorb the ammonia. The droplets of the water that has absorbed the ammonia and the ammonia drain, which is ammonia, fall onto the upper deck 7 around the vent post 30A due to gravity. In addition, the water sprayed from the nozzles 52 acts as a barrier when the ammonia located above settles downward.

[0024] FIG. 3 is a diagram showing a configuration of a water drainage section provided in the marine vessel according to the first embodiment of the present disclosure. 2 and 3, the vent post 30A in the embodiment of the present disclosure includes a drainage section 60A at the bottom of the vent post body 31. The drainage section 60A includes a drain pipe 61 connected to the bottom of the vent post body 31. The drain pipe 61 collects ammonia drain containing ammonia that is not discharged upward from the opening 31a within the vent post body 31 and falls downward, and discharges it to the outside of the vent post body 31.

[0025] 3, a drain pump 62 is provided in the drain pipe 61. The ammonia drain that has accumulated at the bottom inside the vent post main body 31 is discharged by the drain pump 62 through the drain pipe 61 to the outside of the vent post main body 31.

[0026] The drain pipe 61 is connected to a waste water tank 65. The ammonia drain discharged from the inside of the vent post body 31 through the drain pipe 61 is sent to the waste water tank 65. An absorbing liquid introduction line 67 is connected to the wastewater tank 65. The absorbing liquid introduction line 67 introduces bilge water W1, seawater, fresh water, etc., accumulated at the bottom of the hull 2 ​​into the wastewater tank 65 by a pump 67p.

[0027] The wastewater tank 65 is connected to the ammonia component removal section 70 via a drainage line 68. The absorption liquid stored in the wastewater tank 65 is transferred to the ammonia component removal section 70 through the drainage line 68 by opening a valve 68v provided in the drainage line 68.

[0028] The ammonia component removal section 70 removes the ammonia components contained in the absorbing solution. The ammonia component removal section 70 removes the ammonia components contained in the absorbing solution by, for example, a denitrification reaction using sodium hypochlorite. The treated water from which the ammonia components have been removed by the denitrification reaction is discharged from a discharge section 71 connected to the ammonia component removal section 70 into the seawater surrounding the ship 2.

[0029] The absorbing liquid stored in the wastewater tank 65 may be stored as bilge water W1, for example, at the bottom of the hull 2 ​​through a storage line 67B. The bilge water W1 stored at the bottom of the hull 2 ​​may be unloaded through a landing line 69 branching off from the absorbing liquid introduction line 67. In this case, the absorbing liquid containing ammonia unloaded at a port or the like through the landing line 69 is not treated within the hull 2 ​​but is disposed of at a land facility.

[0030] (Action and effect) In the ship 1 of the above embodiment, the air supply unit 40A supplies air from the outside of the vent post 30A into the vent post 30A. This can increase the flow rate of ammonia from the ammonia-existing portion 10, which is discharged from the bottom to the top in the vent post 30A. Therefore, when the mixed gas of air and ammonia supplied into the vent post 30A is discharged to the outside of the vent post 30A, the mixed gas can be diffused farther. In addition, the ammonia in the vent post 30A is diluted by the supplied air, and the ammonia concentration in the mixed gas discharged to the outside of the vent post 30A decreases. Moreover, the air supply unit 40A supplies air to the upper part of the rain receiving part 35 in the vent post 30A. As a result, the mixed gas containing ammonia is forcefully discharged to the outside of the vent post 30A near the outlet of the vent post 30A by the air supplied from the air supply unit 40A. As a result, it is possible to further suppress the retention of ammonia inside and near the vent post 30A.

[0031] In the above embodiment, water is supplied to the outside of the vent post 30A by the outer water supply unit 50 provided on the outside of the upper part of the vent post 30A. This allows ammonia remaining around the outlet of the vent post 30A to be absorbed and dropped downward together with the water. This prevents the ammonia concentration in the atmosphere around the vent post 30A from increasing. In addition, the water sprayed from the nozzle 52 acts as a barrier when ammonia above settles downward, thereby preventing the ammonia gas concentration on the upper deck 7 from increasing.

[0032] Furthermore, in the above embodiment, the air supply unit 40A pumps the pressurized air into the vent post 30A using the air pumping unit 41. This increases the flow rate of ammonia discharged from the bottom to the top in the vent post 30A. As a result, it is possible to further suppress the retention of ammonia inside and near the vent post 30A.

[0033] In the above embodiment, the turbine 42, which takes in seawater from outside the hull 2, is used as a driving source to drive the air pumping unit 41. The seawater taken in by the turbine 42 is used as water to be supplied by the outer water supply unit 50. This reduces the need to provide a dedicated driving source for driving the air pumping unit 41.

[0034] Furthermore, in the above embodiment, the tip 43s of the supply pipe 43A, which supplies air to the inside of the vent post 30A, opens upward, so that the flow rate of ammonia discharged from the bottom to the top within the vent post 30A can be efficiently increased.

[0035] Second Embodiment Next, a second embodiment of the vessel according to the present disclosure will be described. The second embodiment described below differs from the first embodiment in that an inner water supply unit is provided, and therefore the same parts as those in the first embodiment are denoted by the same reference numerals and will not be described again. FIG. 4 is a cross-sectional view of a vent post provided in a vessel according to a second embodiment of the present disclosure. As shown in FIG. 4, in the ship 1 of this embodiment, the vent post 30B includes a vent post body 31, a rain receiving portion 35, an air supply portion 40B, and an inner water supply portion 80.

[0036] The air supply unit 40B supplies air from the outside of the vent post 30B into the vent post body 31 of the vent post 30B. In the embodiment of the present disclosure, the air supply unit 40B supplies air to the inside of the vent post 30B, above the inner water supply unit 80 described below and below the opening 31a. The air supply unit 40B includes an air compression unit 41 and a supply pipe 43A.

[0037] The air compression unit 41 is a fan that takes in air from outside the vent post 30B, pressurizes it, and pressure-feeds it to the feed pipe 43A. The fan that is the air compression unit 41 is driven by a turbine 42. The turbine 42 takes in seawater from outside the hull 2 ​​through a water intake pipe 44. The turbine 42 pressurizes the seawater taken in through the water intake pipe 44 and discharges it through a discharge pipe 45B.

[0038] The inner water supply unit 80 can supply water to the inside of the vent post 30B. The inner water supply unit 80 includes, for example, a water supply pipe 81 and a nozzle 82. The water supply pipe 81 supplies the water to be supplied to the outside of the vent post 30B to the nozzle 82. In this second embodiment, the water supply pipe 81 is connected to the discharge pipe 45B of the turbine 42. The water supply pipe 81 supplies seawater taken in by the turbine 42 to the nozzle 82.

[0039] The nozzle 82 is disposed, for example, below the rain receiving portion 35. The nozzle 82 sprays water supplied through the water supply pipe 81. The water sprayed from the nozzle 82 falls inside the vent post 30B due to gravity. The droplets of the water sprayed from the nozzle 82 come into contact with the ammonia flowing from the bottom to the top inside the vent post 30B, and absorb the ammonia. The droplets of the ammonia drain fall to the bottom inside the vent post 30B due to gravity.

[0040] FIG. 5 is a diagram showing a configuration of a water discharge section provided in a marine vessel according to a second embodiment of the present disclosure. As shown in Figures 4 and 5, the vent post 30B in the second embodiment is provided with a water discharge section 90 at the bottom of the vent post body 31. The water discharge section 90 is provided with a drain pipe 91 connected to the bottom of the vent post body 31. The drain pipe 91 discharges ammonia drain that is sprayed from the nozzle 82 inside the vent post body 31, absorbs ammonia, and falls downward to the outside of the vent post body 31. A drain pump 92 is provided on the drain pipe 91. The ammonia drain that has accumulated at the bottom inside the vent post body 31 is discharged by the drain pump 92 through the drain pipe 91 to the outside of the vent post body 31.

[0041] Here, the temperature of the ammonia drain discharged through the drain pipe 91 is increased by reaction heat generated when the water injected from the nozzle 82 absorbs the ammonia. In the second embodiment, the ammonia drain flowing through the drain pipe 91 is cooled by the water cooling unit 100. Furthermore, in the second embodiment, a ballast tank 101 is provided as the water cooling unit 100. The drain pipe 91 is inserted into the ballast tank 101. The ballast tank 101 is provided in the hull 2. Ballast water W2 is stored in the ballast tank 101. The ammonia drain with an increased temperature that is discharged from the vent post main body 31 through the drain pipe 91 is cooled by heat exchange with the ballast water W2 in the ballast tank 101.

[0042] The temperature of the ballast water W2 in the ballast tank 101 increases due to heat exchange with the ammonia drain in the drain pipe 91. An inlet pipe 103 and a discharge pipe 105 are connected to the ballast tank 101 through which the drain pipe 91 is inserted. The inlet pipe 103 introduces ballast water W2 whose temperature has not increased from, for example, another ballast tank (not shown). The discharge pipe 105 is connected to the discharge section 71, and discharges the ballast water W2 with an increased temperature from the ballast tank 101 to the outside of the hull 2 ​​after being treated by a ballast water treatment device (not shown) or the like.

[0043] The drain pipe 91 is connected to the waste water tank 65. The ammonia drain discharged from the inside of the vent post body 31 through the drain pipe 91 is sent to the waste water tank 65.

[0044] The wastewater tank 65 is connected to the ammonia component removal section 70 via a drainage line 68. The ammonia drain stored in the wastewater tank 65 is transferred to the ammonia component removal section 70 through the drainage line 68 by opening a valve 68v provided in the drainage line 68.

[0045] The ammonia component removal unit 70 removes the ammonia components contained in the ammonia drain by, for example, a denitrification reaction using sodium hypochlorite, as in the first embodiment. The treated water from which the ammonia components have been removed by the denitrification reaction is discharged into the seawater around the hull 2 ​​from a discharge unit 71 connected to the ammonia component removal unit 70.

[0046] Also, similarly to the first embodiment, the ammonia drain stored in the wastewater tank 65 may be unloaded, for example, through a landing line 79A connected to the wastewater tank 65. In this case, the ammonia drain unloaded at a port or the like through the landing line 79A is not treated within the hull 2 ​​but is disposed of at a land facility. Furthermore, when the ammonia concentration of the ammonia drain discharged through the drain pipe 91 is less than a preset reference concentration, the ammonia drain flowing through the drain pipe 91 may be landed through a landing line 79B branching off from the drain pipe 91 downstream of the ballast tank 101. When the ammonia concentration of the ammonia drain discharged through the drain pipe 91 is less than a preset reference concentration, the ammonia drain flowing through the drain pipe 91 may be discharged from the discharge section 71 into the seawater around the hull 2 ​​via a branch pipe 91s.

[0047] (Action and effect) In the ship 1 of the second embodiment, similarly to the first embodiment, the air supply unit 40B supplies air from the outside of the vent post 30B into the vent post 30B. This makes it possible to increase the flow rate of ammonia from the ammonia presence section 10 that is discharged from the bottom to the top in the vent post 30B. Therefore, when the mixed gas of air and ammonia supplied into the vent post 30B is discharged to the outside of the vent post 30B, the mixed gas can be diffused farther. In the ship 1 of the second embodiment, ammonia comes into contact with the water supplied into the vent post 30B by the inner water supply unit 80, so that the ammonia is absorbed into the water and falls downward inside the vent post 30B. This makes it possible to reduce the amount of ammonia that reaches a position above the inner water supply unit 80 inside the vent post 30B. Furthermore, the ammonia inside the vent post 30B is diluted by the air supplied by the air supply unit 40B, so that the ammonia concentration in the mixed gas discharged to the outside of the vent post 30B can be reduced. Moreover, since the air supply unit 40B supplies air into the vent post 30B above the inner water supply unit 80 in the vent post 30B, the mixed gas containing ammonia is forcefully discharged to the outside of the vent post 30B near the outlet of the vent post 30B by the air supplied from the air supply unit 40B. As a result, it is possible to further suppress the retention of ammonia inside and near the vent post 30B.

[0048] In addition, in the above second embodiment, the ammonia drain generated when the water supplied from the inner water supply section 80 into the vent post 30B absorbs ammonia can be discharged from the bottom of the vent post 30B to the outside of the vent post 30B by the water discharge section 90.

[0049] Furthermore, in the second embodiment, the temperature of the water cooling unit 100 increases due to contact with ammonia, and the ammonia drain discharged from the water discharge unit 90 can be cooled.

[0050] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. For example, in each of the above-described embodiments, the tip 43s of the feed tube 43A opens upward, but this is not limited thereto, and the tip 43s may open in another direction.

[0051] FIG. 6 is a cross-sectional view of a bent post according to a first variation of an embodiment of the present disclosure. Also, for example, as in a first modified example shown in FIG. 6, in a vent post 30C, a tip 43t of a feed pipe 43C of an air supply section 40C may open radially inward within the vent post 30C.

[0052] FIG. 7 is a plan view of a bent post according to a second modified example of the embodiment of the present disclosure. 7, a vent post 30D may have a vertically extending cylinder 38 provided radially inside the vent post body 31. The cylinder 38 is circular when viewed vertically, and has a plurality of holes 38h formed all around its circumference. In the second modification, a tip 43u of a feed pipe 43D of an air supply unit 40D opens between the inner circumferential surface of the vent post body 31 and the cylinder 38. Air supplied from the tip 43u of the feed pipe 43D to the annular space between the vent post body 31 and the cylinder 38 is supplied to the radially inside of the cylinder 38 through the plurality of holes 38h.

[0053] FIG. 8 is a cross-sectional view of a bent post according to a third variation of an embodiment of the present disclosure. 8, in a vent post 30E, an air supply unit 40E may include a plurality of sets of a feed pipe 43A and an air compression unit 41. This allows other feed pipes 43A and air compression units 41 to be used when the fan or blower serving as the air compression unit 41 breaks down or during maintenance, thereby increasing versatility.

[0054] FIG. 9 is a cross-sectional view of a bent post according to a fourth modification of the embodiment of the present disclosure. 9, in a vent post 30F, an air supply unit 40F may be configured to connect a plurality of (for example, two) air compression units 41 to one supply pipe 43A. Even in such a configuration, when the fan or blower serving as the air compression unit 41 breaks down or undergoes maintenance, another air compression unit 41 can be used, thereby increasing versatility. It should be noted that the configurations shown in FIGS. 6 and 7 can be combined with the configurations shown in FIGS.

[0055] Furthermore, for example, the configuration shown in the first embodiment and the configuration shown in the second embodiment may be appropriately combined.

[0056] In the above-described embodiments and modifications, the vent posts 30A-30F are configured to release ammonia from the tank 10 that stores ammonia as fuel for the internal combustion engine 8, but the present invention is not limited to this. The vent posts 30A-30F may be configured to release ammonia from a tank that stores ammonia as cargo, for example, provided inside the hull 2. The vent posts 30A-30F may also be configured to release ammonia pushed out of an ammonia distribution system when so-called purging is performed, in which air or an inert gas is fed into the ammonia distribution system to replace the ammonia in the distribution system.

[0057] In addition, in each of the above-described embodiments and modifications, the internal combustion engine 8 is shown as a device that uses ammonia supplied from the tank 10 as fuel, but there is no limitation on the use of the internal combustion engine 8. In addition, the device that uses ammonia as fuel is not limited to the internal combustion engine 8, and may be a boiler or the like as long as it is driven by ammonia.

[0058] In addition, in each of the above-described embodiments and modified examples, the tank 10 is arranged on the upper deck 7 on the stern 2b side of the superstructure 4, but this is not limited to the above. For example, the tank 10 may be provided on the upper deck 7 on the bow 2a side of the superstructure 4. Furthermore, the tank 10 may be provided inside the hull 2 ​​below the upper deck 7, not limited to on the upper deck 7.

[0059] In addition, in each of the above-described embodiments and modifications, seawater is supplied to the inside of the vent posts 30A, 30B by the turbine 42, but the piping layout can be changed as appropriate. Moreover, the water supplied by the outer water supply unit 50 and the inner water supply unit 80 is not limited to seawater, and may be fresh water.

[0060] In addition, in each of the above-described embodiments and modifications, the turbine 42 that takes in seawater from the outside of the hull 2 ​​is used as a driving source to drive the air pumping unit 41, but this is not limited to this. As the driving source of the air pumping unit 41, a suitable source other than the turbine 42 may be used.

[0061] <Additional Notes> The ship 1 described in each embodiment can be understood, for example, as follows.

[0062] (1) A ship 1 according to a first embodiment includes a hull 2, an ammonia presence section 10 provided in the hull 2 ​​in which ammonia is present, a vent post 30A having a tubular vent post main body 31 extending upward from the hull 2 ​​and discharging ammonia from the ammonia presence section 10 from below to above, and a rain receiving section 35 provided within the vent post main body 31, and an air supply section 40A provided above the rain receiving section 35 within the vent post 30A and supplying air from the outside of the vent post 30A.

[0063] This makes it possible to increase the flow rate of ammonia from the ammonia-existing portion 10, which is discharged from the bottom to the top in the vent post 30A. Therefore, when a mixed gas of air and ammonia supplied into the vent post 30A is discharged to the outside of the vent post 30A, the mixed gas can be diffused farther. In addition, the ammonia in the vent post 30A is diluted by the supplied air, and the ammonia concentration in the mixed gas discharged to the outside of the vent post 30A decreases. Moreover, the air supply unit 40A supplies air to the upper part of the rain receiving part 35 in the vent post 30A. As a result, the mixed gas containing ammonia is forcefully discharged to the outside of the vent post 30A near the outlet of the vent post 30A by the air supplied from the air supply unit 40A. As a result, it is possible to further suppress the retention of ammonia inside and near the vent post 30A.

[0064] (2) A ship 1 according to a second aspect includes a hull 2 ​​and The vent post 30B is provided in the hull 2 ​​and includes an ammonia-existing section 10 in which ammonia is present, a vent post 30B that is cylindrical and extends upward from the hull 2 ​​and discharges ammonia from the ammonia-existing section 10 from below to above, an inner water supply section 80 that is capable of supplying water into the vent post 30B, and an air supply section 40B that supplies air from outside the vent post 30B above the inner water supply section 80 inside the vent post 30B.

[0065] This makes it possible to increase the flow rate of ammonia discharged from the ammonia present section 10 in the vent post 30B from the bottom to the top. Therefore, when a mixed gas of air and ammonia supplied into the vent post 30B is discharged to the outside of the vent post 30B, the mixed gas can be diffused farther. Furthermore, when ammonia comes into contact with the water supplied into the vent post 30B by the inner water supply unit 80, the ammonia is absorbed into the water and falls downward inside the vent post 30B. This reduces the amount of ammonia that reaches a position above the inner water supply unit 80 inside the vent post 30B. Furthermore, the ammonia inside the vent post 30B is diluted by the air supplied by the air supply unit 40B, and the ammonia concentration in the mixed gas discharged to the outside of the vent post 30B decreases. Moreover, the air supply unit 40B supplies air into the vent post 30B above the inner water supply unit 80 inside the vent post 30B. This causes the air supplied from the air supply unit 40B to forcefully exhaust the mixed gas containing ammonia near the outlet of the vent post 30B to the outside of the vent post 30B. As a result, it is possible to further suppress the retention of ammonia inside and near the vent post 30B.

[0066] (3) The ship 1 of the third aspect is the ship 1 of (2), further comprising a water discharge section 90 that discharges water supplied from the inner water supply section 80 into the vent post 30B from the bottom of the vent post 30B to the outside of the vent post 30B.

[0067] This allows the water supplied from the inner water supply section 80 into the vent post 30B to absorb ammonia, generating ammonia drain, which can be discharged from the bottom of the vent post 30B to the outside of the vent post 30B by the water discharge section 90.

[0068] (4) The ship 1 according to a fourth aspect is the ship 1 of (3), further including a water cooling unit 100 that cools the water discharged from the water discharge unit 90.

[0069] As a result, the temperature of the water cooling unit 100 increases due to contact with ammonia, and the ammonia drain discharged from the water discharge unit 90 can be cooled.

[0070] (5) The ship 1 according to a fifth aspect is any one of the ships 1 according to (1) to (4), and further includes an external water supply unit 50 provided on the outside of the upper part of the vent post 30A and capable of supplying water to the outside of the vent post 30A.

[0071] This allows the ammonia remaining around the outlet of the vent post 30A to be absorbed and dropped downward together with the water, thereby preventing an increase in the ammonia concentration in the atmosphere around the vent post 30A.

[0072] (6) The ship 1 according to a sixth aspect is any one of the ships 1 according to (1) to (5), wherein the air supply units 40A to 40E include an air pumping unit 41 that pumps pressurized air into the vent posts 30A to 30E.

[0073] This increases the flow rate of ammonia discharged from the bottom to the top inside the vent posts 30A to 30E, thereby making it possible to further suppress retention of ammonia inside and near the vent posts 30A to 30E.

[0074] (7) The ship 1 according to a seventh aspect is the ship 1 of (6), in which the air pumping unit 41 is driven by a seawater driving machine 42 driven by seawater taken in from outside the hull 2.

[0075] As a result, the air pumping unit 41 can be driven by the seawater driving machine 42, which is driven by seawater taken in from outside the hull 2. In addition, the seawater used by the seawater driving machine 42 can also be used as water to be supplied to the inner water supply unit 80, the outer water supply unit 50, etc. In this way, the need to provide a dedicated drive source for driving the air pumping unit 41 is reduced.

[0076] (8) The ship 1 in an eighth aspect is any one of the ships 1 in (1) to (7), wherein the air supply sections 40A, 40B are provided with a supply pipe 43A that supplies air to the inside of the vent posts 30A, 30B, and a tip portion 43s of the supply pipe 43A opens upward inside the vent posts 30A, 30B.

[0077] This makes it possible to efficiently increase the flow rate of ammonia discharged from the bottom to the top within the vent posts 30A and 30B. [Explanation of symbols]

[0078] 1...ship 2...hull 2a...bow 2b...stern 4...superstructure 5A, 5B...shipside 6...bottom 7...upper deck 8...internal combustion engine 10...tank (ammonia-containing part) 20...piping system 30A-30F...vent post 31...vent post body 31a...opening 33...vent pipe 35...rain receiving part 36...drain pipe 38...cylinder 38h...hole 40A-40F...air supply part 41...air pressure delivery part 42...turbine (seawater drive machine) 43A, 43C, 43D...delivery pipe 43s, 43t, 43u...tip 44...water intake pipe 45A, 45B...discharge pipe 46...connecting shaft 50...outer water supply part 51...water supply pipe 52...nozzle 53...connecting pipe 60A...Drain section 61...Drain pipe 62...Drain pump 65...Wastewater tank 67...Absorption liquid introduction line 67B...Storage line 67p...Pump 68...Drain line 68v...Valve 69...Unloading line 70...Ammonia component removal section 71...Discharge section 79A...Unloading line 79B...Unloading line 80...Inner water supply section 81...Water supply pipe 82...Nozzle 90...Water discharge section 91...Drain pipe 91s...Branch pipe 92...Drain pump 100...Water cooling section 101...Ballast tank 103...Introduction pipe 105...Drain pipe W1...Bilge water W2...Ballast water

Claims

1. The hull and an ammonia presence section provided in the hull and in which ammonia is present; A vent post having a tubular vent post body extending upward from the hull and discharging ammonia from the ammonia-existing portion from below to above, and a rain receiving portion provided within the vent post body; an air supply section that supplies air from outside the vent post to an area above the rain receiving section in the vent post; A vessel equipped with:

2. The hull and an ammonia presence section provided in the hull and in which ammonia is present; a vent post having a cylindrical shape extending upward from the hull and discharging ammonia from the ammonia-existing portion from below to above; An inner water supply portion capable of supplying water into the vent post; an air supply unit that supplies air from outside the vent post to above the inner water supply unit within the vent post; A vessel equipped with:

3. The vent post further includes a water discharge section that discharges the water supplied from the inner water supply section into the vent post from the bottom of the vent post to the outside of the vent post.

3. The watercraft of claim 2.

4. A water cooling unit that cools the water discharged from the water discharge unit.

4. The watercraft of claim 3.

5. An outer water supply unit is provided on the outer side of the upper portion of the vent post and capable of supplying water to the outside of the vent post.

3. A vessel as claimed in claim 1 or 2.

6. The air supply unit includes an air pump that pumps pressurized air into the vent post.

3. A vessel as claimed in claim 1 or 2.

7. The air pumping unit is driven by a seawater driving machine driven by seawater taken in from outside the hull.

7. The watercraft of claim 6.

8. The air supply unit includes a supply pipe that supplies air to the inside of the vent post, The tip of the supply pipe opens upward inside the vent post.

3. A vessel as claimed in claim 1 or 2.

Images