Ships

Abstract

To provide a vessel capable of suppressing a hull from becoming large sized.SOLUTION: A vessel includes: a hull; a fuel ammonia tank provided in the hull for retaining fuel ammonia; a fuel supply line connected to the fuel ammonia tank; a combustion device into which fuel ammonia is conducted from the ammonia tank through the fuel supply line; an inactive gas supply device for forcibly feeding inactive gas at least to the combustion device through the fuel supply line; an ammonia recovery tank to which remaining ammonia in the combustion device is conducted along with the inactive gas forcibly fed to the fuel device; a denitrification device to which exhaust gas generated by combustion of fuel ammonia in the combustion device is conducted; and an ammonia conduction line for connecting the ammonia recovery tank and the denitrification device as well as conducting ammonia in the ammonia recovery tank to the denitrification device as reducer.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] In ships that use ammonia as their main fuel, the exhaust gas generated by the combustion of ammonia must be treated with a selective catalytic reduction (SCR) system in order to suppress the emission of nitrogen oxides. The exhaust gas treated by this SCR system is then released into the atmosphere, for example, via a chimney. Patent Document 1 discloses a ship in which ammonia is generated as a reducing agent for use in a denitration device by an ammonia generator.

[0003] On the other hand, in the above-mentioned ship, the fuel of the main engine, which is the combustion device, may be switched from ammonia to other fuel such as heavy oil. When the fuel of the main engine is switched from ammonia to other fuel, it is necessary to purge the ammonia remaining in the combustion device without being burned, for example, with an inert gas or the like, in order to remove the ammonia fuel from the piping. Patent Document 2 discloses a ship in which flammable gas remaining in the piping of a gas engine driven by flammable gas is purged with an inert gas and released into the atmosphere via a vent post. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-47094 A [Patent Document 2] JP 2013-11332 A Summary of the Invention [Problem to be solved by the invention]

[0005] The ship described in Patent Document 1 requires an ammonia generator for generating a reducing agent, and therefore it is necessary to ensure space for installing the ammonia generator within the hull. Ammonia purged with an inert gas as in Patent Document 2 cannot be released directly into the atmosphere and must be rendered harmless (detoxified) by an ammonia detoxification device. However, for example, when a large amount of ammonia remains in the combustion device, this large amount of ammonia must be detoxified, which requires a large ammonia detoxification device, resulting in a problem of an increase in the size of the ship.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a ship that can prevent the hull from becoming larger. [Means for solving the problem]

[0007] In order to solve the above problems, a ship according to the present disclosure includes a hull, a fuel ammonia tank provided in the hull and configured to store fuel ammonia, a fuel supply line connected to the fuel ammonia tank, and a fuel supply line for supplying fuel ammonia from the fuel ammonia tank via the fuel supply line. The fuel ammonia is introduced as fuel. The present invention comprises a combustion device, an inert gas supply device which pressure-feeds an inert gas to at least the combustion device via the fuel supply line, an ammonia recovery tank into which ammonia remaining in the combustion device is introduced together with the inert gas pressure-feeded to the combustion device, a denitration device into which exhaust gas generated by combustion of the fuel ammonia in the combustion device is introduced, and an ammonia introduction line which connects the ammonia recovery tank and the denitration device and introduces the ammonia in the ammonia recovery tank as a reducing agent to the denitration device. The combustion device is capable of operating with a fuel other than the fuel ammonia, and the inert gas supply device pumps inert gas to the combustion device when the fuel used in the combustion device is switched from the fuel ammonia to the other fuel. A ship according to the present disclosure includes a hull, a fuel ammonia tank provided on the hull and storing fuel ammonia, a fuel supply line connected to the fuel ammonia tank, a combustion device into which the fuel ammonia is introduced from the fuel ammonia tank via the fuel supply line, an inert gas supply device that pressure-feeds an inert gas to at least the combustion device via the fuel supply line, an ammonia recovery tank into which ammonia remaining in the combustion device is introduced together with the inert gas pressure-feeded to the combustion device, a denitration device into which exhaust gas generated by combustion of the fuel ammonia in the combustion device is introduced, and the ammonia recovery tank and the denitration device and an ammonia introduction line that connects the ammonia recovery tank and the ammonia recovery tank to the denitration device, and a reducing agent supply line that supplies the fuel ammonia in the fuel ammonia tank as a reducing agent to the denitration device, an ammonia sensor that measures at least one of a concentration and a flow rate of the ammonia in the ammonia introduction line and the reducing agent supply line, and a mixer that adjusts the amount of the ammonia introduced from the ammonia introduction line and the reducing agent supply line to the denitration device, based on at least one of the concentration and the flow rate of the ammonia and load information of the combustion device. Effect of the Invention

[0008] According to the present disclosure, a ship can be provided that can prevent the hull from becoming too large. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a marine vessel according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram showing an introduction system of ammonia to a denitration device according to an embodiment of the present disclosure. [Diagram 3] FIG. 13 is a diagram showing an introduction system of ammonia to a denitration device according to another embodiment of the present disclosure. [Figure 4] FIG. 13 is a diagram showing an introduction system of ammonia to a denitration device according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a vessel according to each embodiment of the present disclosure will be described with reference to the drawings.

[0011] (Vessel configuration) The ship in this embodiment is a ship that uses ammonia as fuel. The type of the ship is not limited to a specific one. Examples of the types of the ship include a liquefied gas carrier, a ferry, a RO-RO ship, a car carrier, and a passenger ship.

[0012] As shown in Figures 1 and 2, the ship 1 includes a hull 10, an upper structure 20, a combustion device 30, a fuel ammonia tank 40, a fuel supply system 50, an ammonia recovery tank 100, an inert gas supply device 60, an inert gas supply system 70, a purge system 80, an ammonia purge line 90, a denitration device 110, an exhaust gas duct 120, a flue 130, an ammonia introduction system 140, an ammonia separation system 150, a reducing agent supply system 160, a mixer 170, an ammonia detoxification system 180, and a vent post 190.

[0013] (Hull) As shown in Fig. 1, the hull 10 has sides 11A, 11B, a ship bottom 12, and an upper deck 13. The sides 11A, 11B have a pair of side shell plates that form the left and right side sides 11A and 11B, respectively. The ship bottom 12 has a double-bottom ship bottom shell plate that connects the sides 11A, 11B. The upper deck 13 is provided across the upper ends of the pair of side sides 11A, 11B shell plates in the vertical direction Dv.

[0014] The outer hull of the hull 10 forms a box shape in a cross section perpendicular to the fore-aft direction Fa by the side panels 11A, 11B, the bottom 12, and the upper deck 13. The fore-aft direction Fa in this embodiment is the direction extending from the stern 15 to the bow 14 of the hull 10.

[0015] (superstructure) The superstructure 20 is a structure provided so as to extend upward in the vertical direction Dv from the upper deck 13. In the superstructure 20, for example, a living area is provided.

[0016] (Combustion equipment) The combustion device 30 is a device that generates thermal energy by burning fuel. The combustion device 30 is provided, for example, in a compartment such as an engine room (not shown) provided inside the hull 10. Examples of the combustion device 30 include a main engine for propelling the ship 1, a generator for supplying electricity to the inside of the ship, and a boiler for generating steam as a working fluid. The combustion device 30 in this embodiment is a main engine that uses ammonia (hereinafter referred to as fuel ammonia) as fuel.

[0017] The combustion device 30 is provided with an output monitoring device (not shown) that periodically acquires load information of the combustion device 30 at a predetermined time interval. The load information in this embodiment is, for example, information that indicates the magnitude of the output of the combustion device 30 (how much load is applied to the combustion device 30), such as the rotation speed of the combustion device 30 or the engine output (horsepower). The output monitoring device acquires the load information of the combustion device 30 and transmits it via wire or wirelessly to a valve control device (a supply amount control device 171 described later) that is provided outside the combustion device 30. The output monitoring device can be, for example, a measuring instrument such as a horsepower meter (shaft horsepower meter for ships).

[0018] (Ammonia fuel tank) The fuel ammonia tank 40 is a tank that stores liquefied ammonia therein as fuel ammonia for the combustion device 30. The fuel ammonia tank 40 in this embodiment is provided on the upper deck 13 on the stern 15 side in the bow-stern direction Fa relative to the superstructure 20.

[0019] (Fuel supply system) The fuel supply system 50 is a system that supplies liquid fuel ammonia from the fuel ammonia tank 40 to the combustion device 30. The fuel supply system 50 in this embodiment is provided inside the hull 10, for example.

[0020] As shown in FIG. 2, the fuel supply system 50 includes a fuel supply line 51, a mix tank 52, a return line 53, a first pump 54, a first heat exchanger 55, a first fuel pressure regulating device 56, a second fuel pressure regulating device 57, and a second heat exchanger 58.

[0021] The fuel supply line 51 is a pipe connecting the fuel ammonia tank 40 and the combustion device 30. Liquid fuel ammonia flows through the fuel supply line 51 from the fuel ammonia tank 40 toward the combustion device 30. Therefore, the fuel ammonia is introduced from the fuel ammonia tank 40 to the combustion device 30 through the fuel supply line 51.

[0022] The mix tank 52 is a tank that recovers from the combustion device 30 the fuel ammonia that has not been supplied to the inside of the combustion device 30 and has returned, i.e., has not been used for combustion, and that recovers the recovered ammonia and re-supplies it to the fuel supply line 51 as fuel ammonia. The mix tank 52 is provided in the fuel supply line 51. Note that the mix tank 52 is not limited to a tank and may be, for example, a pipe.

[0023] The return line 53 is a pipe connecting the combustion device 30 and the mix tank 52. In the return line 53, liquid ammonia that remains without being completely combusted in the combustion device 30 flows from the combustion device 30 to the mix tank 52. Therefore, the ammonia sent to the mix tank 52 by the return line 53 is supplied again into the fuel supply line 51 in the mix tank 52, thereby becoming the fuel ammonia used again in the combustion device 30.

[0024] The first pump 54 is a pump that pumps the fuel ammonia from the fuel ammonia tank 40 to the combustion device 30. The first pump 54 is provided in the fuel supply line 51 on the combustion device 30 side relative to the mix tank 52.

[0025] The first heat exchanger 55 is a heat exchanger that heats the fuel ammonia flowing through the fuel supply line 51. The first heat exchanger 55 is provided in the fuel supply line 51 on the combustion device 30 side relative to the first pump 54. For example, steam generated in an auxiliary boiler or the like (not shown) provided inside the hull 10 or heated liquid is introduced into the first heat exchanger 55 (hereinafter, this steam or liquid will be referred to as a heat source).

[0026] Heat exchange between this heating source and the fuel ammonia occurs in the first heat exchanger 55, whereby the fuel ammonia is heated to a temperature suitable for combustion.

[0027] The first fuel pressure regulating device 56 is a device that regulates the inflow pressure of the fuel ammonia flowing through the fuel supply line 51 to the combustion device 30. The first fuel pressure regulating device 56 is provided in the fuel supply line 51 on the combustion device 30 side relative to the first heat exchanger 55.

[0028] The first fuel pressure regulating device 56 has, for example, a shutoff valve 56a and a first control valve 56b. In this embodiment, two shutoff valves 56a are provided on the fuel supply line 51, spaced apart from each other. The shutoff valve 56a is normally in an open state, and is closed at a predetermined timing. When the shutoff valve 56a is in a closed state, it becomes impossible for the fuel ammonia in the fuel ammonia tank 40 to flow through the fuel supply line 51 toward the combustion device 30.

[0029] The first control valve 56b is an automatically operated valve provided in the fuel supply line 51 between the two shutoff valves 56a. The first control valve 56b adjusts the pressure of the fuel ammonia flowing through the fuel supply line 51 by the opening degree of the valve. The opening degree of the first control valve 56b is suitably controlled, for example, by inputting a control signal instructing the opening degree, which is transmitted from a control device or the like (not shown) that controls the first control valve 56b provided outside the first fuel pressure regulating device 56, to the first control valve 56b.

[0030] The second fuel pressure regulating device 57 is a device that regulates the inflow pressure of the ammonia flowing through the return line 53 into the mix tank 52. The second fuel pressure regulating device 57 is provided in the return line 53.

[0031] The second fuel pressure regulating device 57 has, for example, a shutoff valve 57a and a second control valve 57b. Two shutoff valves 57a are provided on the return line 53, spaced apart from each other. The shutoff valve 57a is normally open and is closed at a predetermined timing. When the shutoff valve 57a is closed, it becomes impossible for the ammonia in the combustion device 30 to flow through the return line 53 toward the mix tank 52.

[0032] The second control valve 57b is an automatically operated valve provided in the return line 53 between the two shutoff valves 57a. The second control valve 57b adjusts the pressure of the ammonia flowing in the return line 53 by changing the opening degree of the valve. The opening degree of the second control valve 57b is suitably controlled by, for example, inputting a control signal instructing the opening degree, which is transmitted from a control device or the like (not shown) that controls the second control valve 57b provided outside the second fuel pressure regulating device 57, to the first control valve 56b.

[0033] In addition, the timing when the shut valves 56a, 57a are closed can be, for example, when the fuel used by the combustion device 30 as the main engine is switched from ammonia to heavy oil or the like, and the fuel ammonia present between the shut valves 56a, 57a is taken out and recovered to the outside.

[0034] The second heat exchanger 58 is a heat exchanger that utilizes the above heat source to heat the ammonia flowing in the return line 53. The second heat exchanger 58 is provided in the return line 53 on the mix tank 52 side of the second fuel pressure regulating device 57. When the ammonia flowing in the return line 53 upstream of the second heat exchanger 58 has a higher temperature than the heat source, the ammonia is cooled in the second heat exchanger 58.

[0035] (Ammonia recovery tank) The ammonia recovery tank 100 is a tank serving as an ammonia recovery section into which the ammonia remaining in the fuel supply line 51, the combustion device 30, and the return line 53 is introduced and which stores the ammonia therein. The ammonia recovery tank 100 in this embodiment is provided, for example, inside the hull 10.

[0036] A level sensor S3 is provided in the ammonia recovery tank 100. The level sensor S3 is a water level gauge that measures the amount of liquid ammonia stored in the ammonia recovery tank 100. The level sensor S3 in this embodiment transmits the measurement result of the amount of ammonia stored in the ammonia recovery tank 100 to a control device or the like (not shown) provided outside the ammonia recovery tank 100 wirelessly or via wire.

[0037] (Inert gas supply device) The inert gas supplying device 60 is a device that generates and pumps an inert gas for purging that is non-reactive with ammonia. The inert gas may be, for example, nitrogen gas (N 2 The inert gas supply device 60 in this embodiment is provided inside the hull 10, for example.

[0038] (Inert gas supply system) The inert gas supply system 70 is a system that sends the inert gas generated by the inert gas supply device 60 to the fuel supply system 50 and the combustion device 30, and purges ammonia present in the fuel supply system 50 and the combustion device 30. The inert gas supply system 70 in this embodiment is provided, for example, inside the hull 10. The inert gas supply system 70 has a first purge line 71 and a first purge valve 72.

[0039] The first purge line 71 is a pipe through which the inert gas generated by the inert gas supply device 60 flows. One end of the first purge line 71 is connected to the inert gas supply device 60. The other end of the first purge line 71 is connected to the fuel supply line 51 between the first heat exchanger 55 and the first fuel pressure regulator 56.

[0040] The inert gas pumped from the inert gas supply device 60 through the first purge line 71 flows into the fuel supply line 51, and is then pumped to the combustion device 30 and the return line 53 in that order. As a result, the inert gas pushes out (purges) the ammonia present in the fuel supply line 51, the combustion device 30, and the return line 53.

[0041] The first purge valve 72 is an automatically operated valve provided in the first purge line 71. The first purge valve 72 is normally closed and is opened at a predetermined timing. When the first purge valve 72 is opened, the inert gas is allowed to flow through the first purge line 71 from the inert gas supply device 60 toward the fuel supply line 51. The automatically operated valve in this embodiment includes an electromagnetic valve, a valve driven by an electric motor, and the like.

[0042] (Purge system) The purge system 80 is a system that extracts ammonia remaining in the fuel supply line 51, the combustion device 30, and the return line 53 to the fuel ammonia tank 40. The purge system 80 in this embodiment is provided, for example, inside the hull 10. The purge system 80 has a plurality of second purge lines 81 and a plurality of second purge valves 82.

[0043] The second purge lines 81 are pipes respectively connecting the fuel supply line 51 and the fuel ammonia tank 40, the combustion device 30 and the fuel ammonia tank 40, and the return line 53 and the fuel ammonia tank 40. When the ammonia present in the fuel supply line 51, the combustion device 30, and the return line 53 is purged into the inert gas, the ammonia flows through the second purge line 81 together with the inert gas.

[0044] In this embodiment, for example, five second purge lines 81 connect the fuel supply line 51 and the fuel ammonia tank 40, the combustion device 30 and the fuel ammonia tank 40, and the return line 53 and the fuel ammonia tank 40, respectively.

[0045] One end of each of the second purge lines 81 is connected to the combustion device 30, the fuel supply line 51 between the two shut valves 56a of the first fuel pressure regulator 56, the return line 53 between the two shut valves 57a of the second fuel pressure regulator 57, the fuel supply line 51 between the first fuel pressure regulator 56 and the first heat exchanger 55, and the return line 53 between the second fuel pressure regulator 57 and the mix tank 52. The other end of each of the second purge lines 81 is connected to the fuel ammonia tank 40.

[0046] The second purge valves 82 are automatically operated valves provided one each on the second purge lines 81. The second purge valves 82 are normally closed and are opened together with the first purge valve 72. Therefore, when the first purge valve 72 and the second purge valve 82 are opened, the inert gas flows through the first purge line 71 and into the fuel supply line 51, the combustion device 30, and the return line 53.

[0047] When the inert gas flows into the fuel supply line 51, the combustion device 30, and the return line 53, the ammonia purged by the inert gas flows toward the ammonia recovery tank 100 via each second purge line 81. That is, the ammonia remaining in the fuel supply line 51, the combustion device 30, and the return line 53 is replaced (purged) by the inert gas.

[0048] (Ammonia purge line) The ammonia purge line 90 is a pipe through which an inert gas flows for purging ammonia in the ammonia recovery tank 100. One end of the ammonia purge line 90 is connected to the first purge line 71 located closer to the inert gas supplying device 60 than the first purge valve 72. The other end of the ammonia purge line 90 is connected to the ammonia recovery tank 100. That is, the ammonia purge line 90 branches off from the first purge line 71, thereby connecting the inert gas supplying device 60 and the ammonia recovery tank.

[0049] The ammonia purge line 90 is provided with a third purge valve 91. The third purge valve 91 is an automatically operated valve. The third purge valve 91 is normally closed and is opened at a predetermined timing. When the third purge valve 91 is opened, the inert gas is introduced into the ammonia purge line 90 via the first purge line 71 and then pumped to the ammonia recovery tank 100.

[0050] In addition, the timing when the third purge valve 91 is opened can be, for example, when the first purge valve 72 is closed and it is necessary to purge the ammonia in the ammonia recovery tank 100.

[0051] (Denitration equipment) The denitration device 110 is a device that receives the exhaust gas G generated by the combustion of ammonia in the combustion device 30 and performs a denitration process on the exhaust gas G. The denitration device 110 uses a denitration catalyst or the like to remove nitrogen oxides (NO X ) to nitrogen (N 2 ) and water (H 2 O).

[0052] The denitration device 110 in this embodiment is a selective catalytic reduction (SCR) denitration device. The denitration device 110 is provided, for example, inside the hull 10. The denitration device 110 reduces the nitrogen oxide concentration of the exhaust gas G introduced from the combustion device 30 to a level at which the nitrogen oxide concentration may be discharged into the atmosphere.

[0053] (Exhaust gas duct) The exhaust gas duct 120 is a duct that forms a flue inside for guiding the exhaust gas G generated in the combustion device 30 to the denitration device 110. One end of the exhaust gas duct 120 is connected to the combustion device 30. The other end of the exhaust gas duct 120 is connected to the denitration device 110. Therefore, the exhaust gas G generated in conjunction with the combustion of fuel ammonia in the combustion device 30 is introduced from the combustion device 30 to the denitration device 110 via this exhaust gas duct 120.

[0054] (flue) The flue 130 is an exhaust gas duct that discharges the exhaust gas G that has been subjected to the denitration treatment by the denitration device 110 into the atmosphere. The flue 130 in this embodiment is connected to the denitration device 110, and extends upward in the vertical direction Dv outside the hull 10, penetrating the upper deck 13. Note that, as shown in FIG. 1, the portion of the flue 130 that extends outside the hull 10 is surrounded by a hull structure 131 and a funnel 132.

[0055] An ammonia sensor S1 and a nitrogen oxide sensor S2 are provided inside the flue 130. Hereinafter, the ammonia sensor S1 provided inside the flue 130 will be referred to as a first ammonia sensor S1a.

[0056] The first ammonia sensor S1a is a sensor that measures the concentration of ammonia contained in the flue gas G flowing upward inside the flue 130. The first ammonia sensor S1a in this embodiment transmits the measurement result of the concentration of ammonia contained in the flue gas G flowing inside the flue 130 to a control device or the like (not shown) wirelessly or via wire.

[0057] The nitrogen oxide sensor S2 is a sensor that measures the nitrogen oxide concentration of the exhaust gas G flowing upward inside the flue 130. The nitrogen oxide sensor S2 in this embodiment transmits the measurement result of the nitrogen oxide concentration of the exhaust gas G flowing inside the flue 130 to a control device or the like (not shown) wirelessly or via wire.

[0058] (Ammonia introduction system) The ammonia introduction system 140 is a system that introduces ammonia from the ammonia recovery tank 100 to the denitration device 110. The ammonia introduction system 140 in this embodiment is provided, for example, inside the hull 10. The ammonia introduction system 140 has an ammonia introduction line 141, a second pump 142, and an ammonia introduction valve 143.

[0059] The ammonia introduction line 141 is a pipe that connects the ammonia recovery tank 100 and the denitration device 110. Inside the ammonia introduction line 141, ammonia in the ammonia recovery tank 100 flows toward the denitration device 110.

[0060] The ammonia introduced into the denitration device 110 via the ammonia introduction line 141 is used as a reducing agent for the denitration catalyst in the denitration device 110. In other words, the ammonia introduction line 141 connects the ammonia recovery tank 100 and the denitration device 110, and introduces the ammonia in the ammonia recovery tank 100 into the denitration device 110 as a reducing agent.

[0061] An ammonia sensor S1 is provided inside the ammonia introduction line 141. Hereinafter, the ammonia sensor S1 provided in the ammonia introduction line 141 will be referred to as a second ammonia sensor S1b. The second ammonia sensor S1b is a sensor that measures the concentration and flow rate of ammonia flowing through the ammonia introduction line 141.

[0062] The second ammonia sensor S1b in this embodiment measures the concentration and flow rate of ammonia flowing through the ammonia introduction line 141 at predetermined time intervals, and transmits the measurement results to a valve control device (a supply amount control device 171 described later) provided outside the ammonia introduction line 141.

[0063] The second pump 142 is a pump that pumps liquid ammonia stored in the ammonia recovery tank 100 from the ammonia recovery tank 100 to the denitration device 110. The second pump 142 is provided in the ammonia introduction line 141 between the position where the second ammonia sensor S1b in the ammonia introduction line 141 is provided and the ammonia recovery tank 100.

[0064] When the internal pressure of the ammonia recovery tank 100 is sufficiently high, the ammonia introduction system 140 does not need to have the second pump 142. That is, when the internal pressure of the ammonia recovery tank 100 is high, the liquid ammonia in the ammonia recovery tank 100 is pushed into the ammonia introduction line 141 by the pressure difference. This allows the liquid ammonia to flow through the ammonia introduction line 141 from the ammonia recovery tank 100 toward the denitration device 110.

[0065] The ammonia introduction valve 143 is an automatically operated valve provided in the ammonia introduction line 141 between the second pump 142 and the ammonia recovery tank 100. The ammonia introduction valve 143 is normally in an open state and is closed at a predetermined timing. When the ammonia introduction valve 143 is in a closed state, it becomes impossible for ammonia to flow through the ammonia introduction line 141 from the ammonia recovery tank 100 toward the denitration device 110.

[0066] Specifically, the ammonia introduction valve 143 is closed, for example, when the ammonia flowing from the ammonia recovery tank 100 to the ammonia introduction line 141 transitions from a liquid state to a gas state. When the ammonia state transitions from a liquid state to a gas state, the ammonia introduced from the ammonia recovery tank 100 to the ammonia introduction line 141 is mixed with an inert gas.

[0067] Incidentally, whether the ammonia introduction valve 143 is in an open state or a closed state may be determined based on a measurement result of a level sensor S3 provided in the ammonia recovery tank 100. Specifically, a control device or the like that receives the measurement result of the level sensor S3 may compare the measurement result with a threshold value related to a predetermined water level to determine the open / closed state that the ammonia introduction valve 143 should be in.

[0068] (Ammonia separation system) The ammonia separation system 150 is a system that separates ammonia from a mixed gas of an inert gas and an ammonia gas from the gas phase part of the ammonia recovery tank 100. The ammonia separation system 150 in this embodiment is provided, for example, inside the hull 10. The ammonia separation system 150 has a gas line 151, a gas compressor 152, a separator 153, a gas line inlet valve 154, a gas line outlet valve 155, and a return line 156.

[0069] The gas line 151 is a pipe for introducing a mixed gas of an inert gas and an ammonia gas from the gas phase of the ammonia recovery tank 100. One end of the gas line 151 is connected to the ammonia recovery tank 100. The other end of the gas line 151 is connected to the ammonia introduction line 141 between the ammonia introduction valve 143 and a position in the ammonia introduction line 141 where the second ammonia sensor S1b is provided.

[0070] The gas pressure sender 152 is provided in the gas line 151 and is a blower that causes gas to flow through the gas line 151 .

[0071] The separation device 153 is a device that separates ammonia from the gas flowing through the gas line 151 and sends the ammonia to the denitrification device 110. The separation device 153 in this embodiment has a separation membrane that separates ammonia from the gas. The separation device 153 is provided in the gas line 151 downstream of the gas compressor 152.

[0072] The separator 153 separates the gas delivered by the gas compressor 152 into ammonia (NH 3 ) and inert gas mixed with some unseparated ammonia (inert gas + NH 3 ) and separated into

[0073] The separator 153 sends only the separated ammonia downstream to the gas line 151. Therefore, the ammonia separated from the gas by the separator 153 is introduced into the ammonia introduction line 141 and headed toward the denitration device 110 as a reducing agent for the denitration catalyst.

[0074] The gas line inlet valve 154 is an automatically operated valve provided in the gas line 151 upstream of the gas compressor 152. The gas line outlet valve 155 is an automatically operated valve provided in the gas line 151 downstream of the separation device 153.

[0075] The gas line inlet valve 154 and the gas line outlet valve 155 are normally closed and opened at a predetermined timing. The gas line inlet valve 154 and the gas line outlet valve 155 are controlled to be opened when, for example, the ammonia introduction valve 143 is closed and gas remains in the ammonia recovery tank 100.

[0076] The return line 156 is a pipe connecting the separation device 153 and the ammonia recovery tank 100. Of the ammonia separated from the gas by the separation device 153 and the inert gas mixed with a part of ammonia that was not separated from the gas, the latter inert gas mixed with a part of ammonia flows through the return line 156. Therefore, the inert gas mixed with a part of ammonia separated by the separation device 153 is returned from the separation device 153 to the ammonia recovery tank 100 via the return line 156.

[0077] (Reducing agent supply system) The reducing agent supply system 160 is a system that supplies fuel ammonia from the fuel ammonia tank 40 to the denitration device 110 without passing through the ammonia recovery tank 100. The reducing agent supply system 160 has a reducing agent supply line 161, a third pump 162, and a third heat exchanger 163.

[0078] The reducing agent supply line 161 is a pipe that supplies fuel ammonia from the fuel ammonia tank 40 to the ammonia introduction line 141. One end of the reducing agent supply line 161 is connected to the fuel ammonia tank 40, and the other end is connected to the ammonia introduction line 141 between the position where the second ammonia sensor S1b is provided in the ammonia introduction line 141 and the denitration device 110.

[0079] In the reducing agent supply line 161, the fuel ammonia in the fuel ammonia tank 40 flows toward the ammonia introduction line 141. The fuel ammonia introduced into the ammonia introduction line 141 is supplied to the denitration device 110. Therefore, the fuel ammonia introduced into the denitration device 110 via the reducing agent supply line 161 and the ammonia introduction line 141 is used as a reducing agent for the denitration catalyst in the denitration device 110. Therefore, the reducing agent supply line 161 supplies the fuel ammonia in the fuel ammonia tank 40 to the denitration device 110 as a reducing agent.

[0080] An ammonia sensor S1 is provided inside the reducing agent supply line 161. Hereinafter, the ammonia sensor S1 provided in the reducing agent supply line 161 will be referred to as a third ammonia sensor S1c. The third ammonia sensor S1c is a sensor that measures the concentration and flow rate of ammonia flowing in the reducing agent supply line 161. The third ammonia sensor S1c in this embodiment measures the concentration and flow rate of ammonia flowing in the reducing agent supply line 161 at predetermined time intervals, and transmits the measurement results to a valve control device provided outside the reducing agent supply line 161.

[0081] The third pump 162 is a pump that pumps the fuel ammonia flowing inside the reducing agent supply line 161 from the fuel ammonia tank 40 to the ammonia introduction line 141. The third pump 162 is provided in the reducing agent supply line 161.

[0082] The third heat exchanger 163 is a heat exchanger that heats the fuel ammonia flowing through the reducing agent supply line 161. The third heat exchanger 163 is provided in the reducing agent supply line 161 closer to the ammonia introduction line 141 than the position of the reducing agent supply line 161 where the third pump 162 is provided.

[0083] For example, the above-mentioned heat source is introduced into the third heat exchanger 163. The steam and the fuel ammonia exchange heat in the third heat exchanger 163, whereby the fuel ammonia is heated to a temperature suitable for the reducing agent of the denitration device 110.

[0084] (mixer) The mixer 170 is a device that adjusts the amount of ammonia introduced from the ammonia introduction line 141 and the reducing agent supply line 161 to the denitration device 110, based on the concentration of ammonia in the ammonia introduction line 141 and the reducing agent supply line 161, the flow rate of ammonia, and load information of the combustion device 30. The mixer 170 in this embodiment is provided, for example, inside the hull 10. The mixer 170 has a supply amount control device 171, a third control valve 172, and a fourth control valve 173.

[0085] The supply amount control device 171 is a valve control device that controls the amount of ammonia supplied to the denitration device 110 based on the concentration and flow rate of ammonia flowing through the ammonia introduction line 141, the concentration and flow rate of fuel ammonia flowing through the reducing agent supply line 161, and load information of the combustion device 30.

[0086] The supply amount control device 171 acquires the measurement results of the second ammonia sensor S1b and the third ammonia sensor S1c, and load information of the combustion device 30 transmitted from the output monitoring device. The supply amount control device 171 adjusts the amount of ammonia introduced from the ammonia introduction line 141 to the denitration device 110 and the amount of ammonia introduced from the reducing agent supply line 161 to the ammonia introduction line 141, based on these measurement results and the load information.

[0087] The third control valve 172 is an automatically operated valve provided in the ammonia introduction line 141 between a position where the ammonia sensor S1b is provided in the ammonia introduction line 141 and a position where the reducing agent supply line 161 and the ammonia introduction line 141 are connected. The third control valve 172 adjusts the inflow amount of ammonia flowing through the ammonia introduction line 141 into the denitration device 110 by changing the opening degree of the valve.

[0088] The opening degree of the third control valve 172 is controlled by inputting a control signal to the third control valve 172, the control signal indicating the opening degree determined by the supply amount control device 171 based on the measurement results of the second ammonia sensor S1b and the third ammonia sensor S1c, and on the load information of the combustion device 30 transmitted from the output monitoring device.

[0089] The fourth control valve 173 is an automatically operated valve provided in the reducing agent supply line 161 downstream of the third heat exchanger 163. The fourth control valve 173 adjusts the inflow amount of the fuel ammonia flowing through the reducing agent supply line 161 into the ammonia introduction line 141 by changing the opening degree of the valve.

[0090] The opening degree of the fourth control valve 173 is controlled by inputting a control signal to the fourth control valve 173, the control signal indicating the opening degree determined by the supply amount control device 171 based on the measurement results of the second ammonia sensor S1b and the third ammonia sensor S1c, and on the load information of the combustion device 30 transmitted from the output monitoring device.

[0091] (Ammonia removal system) The ammonia detoxification system 180 is a system that renders the ammonia in the ammonia recovery tank 100 harmless (detoxifies the ammonia). The ammonia detoxification system 180 in this embodiment is provided, for example, inside the hull 10. The ammonia detoxification system 180 has an ammonia detoxification device 181, an ammonia detoxification line 182, and a detoxification device valve 183.

[0092] The ammonia detoxification device 181 is a device that detoxifies the ammonia introduced from the ammonia recovery tank 100. The ammonia detoxification device 181 in this embodiment is a scrubber. Note that the ammonia detoxification device 181 is not limited to a scrubber, and may be a combustion type gas treatment device or the like. The ammonia detoxification device 181 reduces the concentration of ammonia introduced from the ammonia recovery tank 100 to a level at which it may be released into the atmosphere.

[0093] The ammonia detoxification line 182 is a pipe connecting the ammonia recovery tank 100 and the ammonia detoxification device 181. Ammonia in the ammonia recovery tank 100 flows through the ammonia detoxification line 182 toward the ammonia detoxification device 181. That is, the ammonia in the ammonia recovery tank 100 is introduced into the ammonia detoxification device 181 through the ammonia detoxification line 182.

[0094] The abatement device valve 183 is an automatically operated valve provided in the ammonia abatement line 182. The abatement device valve 183 is normally in a closed state and is opened at a predetermined timing. When the abatement device valve 183 is in an open state, ammonia can flow from the ammonia recovery tank 100 to the ammonia abatement device 181 through the ammonia abatement line 182, and the ammonia in the ammonia recovery tank 100 is detoxified by the ammonia abatement device 181.

[0095] (Bent Post) The vent post 190 is a pipe that releases into the atmosphere the ammonia that has been detoxified by the ammonia detoxification device 181. The vent post 190 in this embodiment is connected to the ammonia detoxification device 181, and extends upward in the vertical direction Dv outside the hull 10, penetrating the upper deck 13.

[0096] (Action and effect) According to the configuration of the ship 1 according to the embodiment, at least the ammonia remaining in the combustion device 30 is introduced into the ammonia recovery tank 100 together with the inert gas pumped by the inert gas supply device 60. The ammonia introduced into the ammonia recovery tank 100 is introduced into the denitration device 110 via the ammonia introduction line 141 and is used as a reducing agent for the denitration device 110. As a result, even if a large amount of ammonia remaining in the combustion device 30 is recovered when the fuel used by the combustion device 30 is switched from ammonia to another fuel, the ammonia can be effectively utilized and detoxified by the denitration device 110. In other words, since it is not necessary to detoxify the entire amount of ammonia recovered from the combustion device 30 by the ammonia detoxification device 181 or the like and release it into the atmosphere, a large ammonia detoxification device 181 is not required. Therefore, the size of the ship 10 can be suppressed. Furthermore, for example, by combining the above-mentioned configuration with an existing ammonia detoxification device 181, the time required to detoxify the recovered ammonia can be shortened.

[0097] Furthermore, according to the configuration of the ship 1 according to the embodiment, the separation device 153 separates ammonia from the gas sent from the ammonia recovery tank 100, and sends this ammonia to the denitration device 110. As a result, even if, for example, liquid ammonia that can flow from the ammonia recovery tank 100 to the ammonia introduction line runs out, the separation device 153 can send only ammonia to the denitration device 110. Therefore, since only ammonia can be constantly introduced into the denitration device 110, a decrease in reduction efficiency in the denitration device 110 can be suppressed.

[0098] Furthermore, according to the configuration of the ship 1 according to the above embodiment, fuel ammonia in the fuel ammonia tank 40 is introduced into the denitration device 110 via the reducing agent supply line 161, and this fuel ammonia can also be used as a reducing agent for the denitration device 110. As a result, even if the ammonia that can flow from the ammonia recovery tank 100 into the ammonia introduction line 141 runs out, for example, fuel ammonia can be supplied as a reducing agent to the denitration device 110. Therefore, ammonia as a reducing agent can be introduced into the denitration device 110 at any time, so that the denitration device 110 does not run out of reducing agent.

[0099] Furthermore, according to the configuration of the ship 1 according to the above embodiment, the mixer 170 adjusts the amount of ammonia introduced into the denitration device 110 based on the concentrations of ammonia in the ammonia introduction line 141 and the reducing agent supply line 161. This makes it possible to adjust the amount of ammonia introduced into the denitration device 110 to an appropriate amount. Therefore, the reduction efficiency of the denitration device 110 can be stabilized.

[0100] Furthermore, according to the configuration of the ship 1 according to the above embodiment, the inert gas can be supplied to the ammonia recovery tank 100 via the ammonia purge line 90. As a result, even if the combustion device 30 is operating, for example, the inert gas can be sent to the ammonia recovery tank 100 via the ammonia purge line 90. Therefore, all of the ammonia in the ammonia recovery tank 100 can be introduced into the denitration device 110 via the ammonia introduction line 141, making it unnecessary to use the ammonia detoxification device 181.

[0101] [Other embodiments] Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to the configuration of the embodiment, and addition, omission, substitution, and other modifications of the configuration are possible within the scope of the gist of the present disclosure. Furthermore, the present disclosure is not limited to the embodiments, but is limited only by the claims.

[0102] In addition, one end of each of the second purge lines 81 described in the above embodiment is connected to the fuel supply line 51, the combustion device 30, and the return line 53, respectively, but is not limited to this configuration. The number of second purge lines 81 may be any appropriate number, and one end of each of the second purge lines 81 may be connected to an appropriate location. That is, the number of second purge lines 81 is not limited to five.

[0103] Furthermore, the supply amount control device 171 of the mixer 170 described in the above embodiment may control the opening degree of the third control valve 172 and the fourth control valve 173 based on the measurement result of the first ammonia sensor S1a provided inside the flue 130. As a result, even if, for example, a failure occurs in the second ammonia sensor S1b or the third ammonia sensor S1c, causing an abnormality in the measurement results, the amount of ammonia introduced into the denitration device 110 can be stabilized based on the measurement result of the first ammonia sensor S1a as well.

[0104] Furthermore, the mixer 170 described in the above embodiment may be configured to adjust the amount of ammonia introduced into the denitration device 110 based on at least one of the ammonia concentration and flow rate and on the load information of the combustion device 30. Therefore, the ammonia sensor S1b and the ammonia sensor S1c may be configured to measure only one of the ammonia concentration and flow rate.

[0105] In addition, when the ammonia sensors S1b and S1c measure only the flow rate of ammonia, the supply amount control device 171 may control the opening degrees of the third control valve 172 and the fourth control valve 173 based also on the measurement results of the first ammonia sensor S1a and the nitrogen oxide sensor S2.

[0106] 3, the ammonia in the ammonia introduction line 141 and the ammonia in the reducing agent supply line 161 may be separately supplied to the denitration device 110. This allows liquid or gaseous ammonia to be supplied from the ammonia introduction line 141, and liquid fuel ammonia to be supplied from the reducing agent supply line 161. Therefore, for example, when the ammonia supplied from the ammonia introduction line 141 is gaseous, this ammonia is mixed with the liquid ammonia supplied from the reducing agent supply line 161 by the mixer 170, and the ammonia does not become in a gas-liquid mixed state.

[0107] Furthermore, the first heat exchanger 55, the second heat exchanger 58, and the third heat exchanger 163 described in the above embodiment are not limited to the configuration of a heat exchanger that utilizes the above-mentioned heat source as a heat medium, and may be, for example, a heating device that can apply thermal energy, such as an electric heater.

[0108] As shown in FIG. 4, the ship 1 described in the above embodiment may further include an ammonia transfer tank 101. The ammonia transfer tank 101 is a tank that is provided in the ammonia introduction line 141 between the ammonia recovery tank 100 and the ammonia introduction valve 143 and can store ammonia therein. This allows the ammonia in the ammonia recovery tank 100 to be transferred to the ammonia transfer tank 101, and the ammonia recovery tank 100 can be made free of liquid ammonia. That is, for example, when the fuel used by the combustion device 30 is switched from ammonia to another fuel such as heavy oil and then switched back from the other fuel to ammonia, the ammonia in the ammonia recovery tank 100 can be temporarily stored or transferred to the ammonia transfer tank 101 in advance. Therefore, the other fuel can be collected in the empty ammonia recovery tank 100, and operations related to the fuel switching can be smoothly performed.

[0109] [Note] The ship described in the embodiment can be understood, for example, as follows.

[0110] (1) A ship 1 according to a first aspect includes a hull 10, a fuel ammonia tank 40 provided in the hull 10 and storing fuel ammonia, a fuel supply line 51 connected to the fuel ammonia tank 40, a combustion device 30 to which the fuel ammonia is introduced from the fuel ammonia tank 40 via the fuel supply line 51, an inert gas supply device 60 that pressure-feeds an inert gas to at least the combustion device 30 via the fuel supply line 51, an ammonia recovery tank 100 to which ammonia remaining in the combustion device 30 is introduced together with the inert gas pressure-feeded to the combustion device 30, a denitration device 110 to which exhaust gas G generated by combustion of the fuel ammonia in the combustion device 30 is introduced, and an ammonia introduction line 141 that connects the ammonia recovery tank 100 and the denitration device 110 and introduces the ammonia in the ammonia recovery tank 100 as a reducing agent to the denitration device 110.

[0111] According to the above configuration, for example, when the fuel used by the combustion device 30 is switched from ammonia to another fuel, even if a large amount of ammonia remaining in at least the combustion device 30 is recovered, this ammonia can be effectively utilized and detoxified in the denitration device 110. In addition, for example, by using an existing ammonia detoxification device 181 in combination with the above configuration, the time required to detoxify the recovered ammonia can be shortened.

[0112] (2) The ship 1 according to a second aspect is the ship 1 of (1), and may further include a gas line 151 that introduces gas in the ammonia recovery tank 100 into the ammonia introduction line 141, and may further include a separation device 153 that separates the ammonia from the gas flowing through the gas line 151 and sends the ammonia to the denitrification device 110.

[0113] According to the above configuration, even if liquid ammonia that can flow from the ammonia recovery tank 100 to the ammonia introduction line runs out, gaseous ammonia can be caused to flow together with the inert gas into the gas line 151. Then, the separator 153 can send only ammonia to the denitration device 110.

[0114] (3) The ship 1 according to a third aspect may be the ship 1 of (1) or (2), further including a reducing agent supply line 161 that supplies the fuel ammonia in the fuel ammonia tank 40 to the denitration device 110 as a reducing agent.

[0115] According to the above configuration, the fuel ammonia in the fuel ammonia tank 40 can also be used as a reducing agent for the denitration device 110. Therefore, for example, even if the ammonia that can flow from the ammonia recovery tank 100 to the ammonia introduction line 141 runs out, the fuel ammonia can be supplied to the denitration device 110 as a reducing agent.

[0116] (4) The ship 1 according to a fourth aspect is the ship 1 of (3), and may further include an ammonia sensor S1 that measures at least one of a concentration and a flow rate of the ammonia in the ammonia introduction line 141 and the reducing agent supply line 161, and a mixer 170 that adjusts the amount of the ammonia introduced from the ammonia introduction line 141 and the reducing agent supply line 161 to the denitrification device 110 based on at least one of the concentration and the flow rate of the ammonia and load information of the combustion device.

[0117] According to the above configuration, the amount of ammonia introduced into the denitration device 110 can be adjusted to an appropriate amount.

[0118] (5) The ship 1 according to a fifth aspect may be any of the ships 1 according to (1) to (4), and may further include an ammonia purge line 90 that connects the inert gas supply device 60 to the ammonia recovery tank 100 and through which the inert gas flows.

[0119] According to the above configuration, for example, even if the combustion device 30 is operating, the inert gas can be sent to the ammonia recovery tank 100 via the ammonia purge line 90. Therefore, all of the ammonia in the ammonia recovery tank 100 can be introduced into the denitration device 110 via the ammonia introduction line 141, so that it is not necessary to use the ammonia detoxification device 181. [Explanation of symbols]

[0120] 1...ship 10...hull 11A, 11B...shipside 12...bottom 13...upper deck 13 14...bow 15...stern 20...superstructure 30...combustion system 40...fuel ammonia tank 50...fuel supply system 51...fuel supply line 52...mix tank 53...return line 54...first pump 55...first heat exchanger 56...first fuel pressure regulator 56a, 57a...shut valve 56b...first control valve 57...second fuel pressure regulator 57b...second control valve 58...second heat exchanger 60...inert gas supply system 70...inert gas supply system 71...first purge line 72...first purge valve 80...purge system 81...second purge line 82...second purge valve 90...ammonia purge line 91...third purge valve 100...ammonia recovery tank 101...Ammonia transfer tank 110...Denitrification device 120...Exhaust gas duct 130...Fume duct 131...Hull structure 132...Funnel 140...Ammonia introduction system 141...Ammonia introduction line 142...Second pump 143...Ammonia introduction valve 150...Ammonia separation system 151...Gas line 152...Gas compressor 153...Separator 154...Gas line inlet valve 155...Gas line outlet valve 156...Return line 160...Reducing agent supply system 161...Reducing agent supply line 162...Third pump 163...Third heat exchanger 170...Mixer 171...Feed amount control device 172...Third control valve 173...Fourth control valve 180...Ammonia detoxification system 181...Ammonia detoxification device 182...Ammonia detoxification line 183...Detoxification device valve 190...Vent post Dv...Up and down direction Fa...Fore-stern direction G...Exhaust gas S1...Ammonia sensor S1a...First ammonia sensor S1b...Second ammonia sensor S1c...Third ammonia sensor S2...Nitrogen oxide sensor S3...Level sensor

Claims

1. The hull and A fuel ammonia tank provided in the hull and configured to store fuel ammonia; a fuel supply line connected to the fuel ammonia tank; A combustion device operated using the fuel ammonia introduced from the fuel ammonia tank through the fuel supply line as fuel; an inert gas supply device that pressure-feeds an inert gas to at least the combustion device through the fuel supply line; an ammonia recovery tank into which ammonia remaining in the combustion device is introduced together with the inert gas pumped to the combustion device; A denitration device into which exhaust gas generated by combustion of the fuel ammonia in the combustion device is introduced; an ammonia introduction line connecting the ammonia recovery tank and the denitration device and introducing the ammonia in the ammonia recovery tank as a reducing agent into the denitration device; Equipped with The combustion device can be operated with a fuel other than the fuel ammonia, The inert gas supply device is a ship that pressure-feeds the inert gas to the combustion device when the fuel used in the combustion device is switched from the fuel ammonia to the other fuel.

2. A ship as described in claim 1, wherein an ammonia introduction line introduces the ammonia in the ammonia recovery tank into the de-nitrification device after the fuel used in the combustion device is switched from the fuel ammonia to the other fuel.

3. 3. The ship according to claim 1, further comprising a reducing agent supply line that supplies the fuel ammonia in the fuel ammonia tank to the denitration device as a reducing agent.

4. an ammonia sensor that measures at least one of a concentration and a flow rate of the ammonia in the ammonia introduction line and the reducing agent supply line; a mixer that adjusts an amount of the ammonia introduced from the ammonia introduction line and the reducing agent supply line to the denitration device based on at least one of the concentration and the flow rate of the ammonia and load information of the combustion device; The marine vessel of claim 3 further comprising:

5. The hull and A fuel ammonia tank provided in the hull and configured to store fuel ammonia; a fuel supply line connected to the fuel ammonia tank; a combustion device into which the fuel ammonia is introduced from the fuel ammonia tank via the fuel supply line; an inert gas supply device that pressure-feeds an inert gas to at least the combustion device through the fuel supply line; an ammonia recovery tank into which ammonia remaining in the combustion device is introduced together with the inert gas pumped to the combustion device; A denitration device into which exhaust gas generated by combustion of the fuel ammonia in the combustion device is introduced; an ammonia introduction line connecting the ammonia recovery tank and the denitration device and introducing the ammonia in the ammonia recovery tank as a reducing agent into the denitration device; a reducing agent supply line that supplies the fuel ammonia in the fuel ammonia tank to the denitration device as a reducing agent; an ammonia sensor that measures at least one of a concentration and a flow rate of the ammonia in the ammonia introduction line and the reducing agent supply line; a mixer that adjusts an amount of the ammonia introduced from the ammonia introduction line and the reducing agent supply line to the denitration device based on at least one of the concentration and the flow rate of the ammonia and load information of the combustion device; A vessel equipped with:

6. A gas line for introducing gas in the ammonia recovery tank into the ammonia introduction line is further provided, The ship according to any one of claims 1 to 5, further comprising a separation device that separates the ammonia from the gas flowing through the gas line and sends the ammonia to the denitrification device.

7. 7. The ship according to claim 1, further comprising an ammonia purge line that connects the inert gas supply device and the ammonia recovery tank and through which the inert gas flows.

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