Ammonia gas treatment device and ammonia gas treatment method

Abstract

The invention provides an ammonia gas treatment device and an ammonia gas treatment method, which can effectively treat ammonia gas volatilized from cargo or ammonia gas remaining in a fuel supply line of a power machine in a ship without discharging the ammonia gas to the outside of the ship, and does not need an additional ammonia water supply tank. In the ammonia gas treatment device and the ammonia gas treatment method, the ammonia gas remaining in the fuel supply line of the engine (3) becomes ammonia water in the disinfection device (6), the exhaust gas of the engine (3), the urea water from the urea water tank (8), and the ammonia water generated by the disinfection device (6) are introduced into the selective reduction catalyst unit (17), and the exhaust gas is denitrated. And the ammonia water is subjected to innocent treatment.

Description

Technical Field

[0001] This invention relates to an ammonia treatment apparatus and method for ships carrying liquefied ammonia as cargo or engine fuel. More specifically, it relates to an ammonia treatment apparatus and method that can effectively treat ammonia gas inside the ship without discharging ammonia gas volatilized from cargo or ammonia gas remaining in the fuel supply lines of the power machinery into water, thereby eliminating the need for additional ammonia water supply tanks. Background Technology

[0002] As described in Patent Document 1, urea SCR (selective reduction) systems are known as methods for removing NO contained in exhaust gases from engines. x A waste gas purification device for purifying nitrogen oxides.

[0003] In a urea SCR system, the ammonia gas generated by the hydrolysis of urea water injected into the exhaust gas due to the heat of the exhaust gas is used as a reducing agent. Under the condition of an SCR catalyst, NO... x It reacts chemically with ammonia to reduce it to nitrogen and water.

[0004] Due to the NO of ships x With stricter emission restrictions, urea SCR systems are being introduced into ships.

[0005] On the other hand, in recent years, with the issue of global warming, liquefied ammonia has been considered as a fuel for ship propulsion engines. When using liquefied ammonia as fuel, it is sometimes necessary to empty the fuel supply system to purge the fuel supply lines or to control combustion within the combustion range in case of anomalies. Furthermore, in the tanks storing liquefied ammonia, due to its volatility, ammonia gas, known as vapor gas, is generated due to natural heat input and other factors. If ammonia gas generation is allowed to continue, the pressure inside the tank will rise and exceed the design pressure.

[0006] Furthermore, because ammonia is flammable and toxic, direct storage of ammonia may have adverse effects on human health. Therefore, it is necessary to remove the toxicity of ammonia through a purification device. This purification device uses a mechanism that dissolves ammonia in water to generate ammonia solution.

[0007] In addition, according to current environmental regulations, ammonia cannot be discharged outside the ship, so ammonia recovered inside the ship needs to be treated on board.

[0008] Furthermore, since ships need to install various devices within a limited space, methods that can be carried out in a smaller space are desired.

[0009] In Patent Document 2, liquefied ammonia, which is used as fuel, is supplied to a selective reduction catalyst device for denitrification treatment.

[0010] In Patent Document 3, residual ammonia in the fuel supply system is recovered and treated as in-ship ammonia water. The recovered ammonia water is then fed to a selective reduction catalyst (SCR) unit after reaching a specified high concentration (e.g., several tens of percent). The ammonia component is consumed through denitrification treatment of engine exhaust gas.

[0011] However, in Patent Document 2, since the residual ammonia in the fuel supply system is not recovered, the issue of residual ammonia recovery is not addressed.

[0012] Patent document 3, which describes the recovery of residual ammonia in a fuel supply system, uses recovered ammonia water to denitrify engine exhaust. However, the recovered ammonia water may not have a sufficient concentration for denitrification, necessitating the installation of an additional ammonia water supply tank, thus requiring additional space.

[0013] Existing technical documents

[0014] Patent documents

[0015] Patent Document 1: Japanese Patent Application Publication No. 2020-045769

[0016] Patent Document 2: Japanese Patent Publication No. 2022-528443

[0017] Patent Document 3: Japanese Patent Application Publication No. 2022-179983 Summary of the Invention

[0018] The purpose of this invention is to provide an ammonia treatment device and ammonia treatment method that can effectively treat ammonia gas inside the ship without discharging the ammonia gas volatilized from cargo or ammonia gas remaining in the fuel supply line of the power machinery into water. This treatment does not require additional ammonia supply tanks.

[0019] Furthermore, other objectives of the present invention become clear from the following description.

[0020] The above objectives are achieved through the following inventions.

[0021] 1. An ammonia treatment device, installed in a ship carrying liquefied ammonia as fuel for cargo or ship propulsion machinery and having a selective reduction catalyst unit, wherein in the ammonia treatment device,

[0022] Within the selective reduction catalyst unit, the exhaust gas from the ship's power machinery is supplied with urea water as a reducing agent, and a selective reduction catalyst is configured to denitrify the exhaust gas.

[0023] The ammonia treatment device includes a purging unit that dissolves liquefied ammonia remaining in the fuel supply lines of the ship's power machinery into clean water to generate ammonia water.

[0024] The ammonia water generated by the removal device is supplied to the selective reduction catalyst unit to treat the ammonia water to render it harmless.

[0025] 2. In the ammonia treatment apparatus described in 1, the ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit reaches the selective reduction catalyst unit in a manner independent of the urea water supply path for supplying the urea water to the selective reduction catalyst unit.

[0026] The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle.

[0027] The nozzle is a three-fluid nozzle, comprising: a flow path connected to an air supply source to supply air for diffusing the urea solution and / or the ammonia solution; a flow path connected to the urea solution supply path to spray the urea solution; and a flow path connected to the ammonia solution supply path to spray the ammonia solution.

[0028] The nozzle is positioned upstream of the selective reduction catalyst unit.

[0029] 3. In the ammonia treatment apparatus described in 1, the ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit reaches the selective reduction catalyst unit in a manner independent of the urea water supply path for supplying the urea water to the selective reduction catalyst unit.

[0030] The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle.

[0031] The nozzle includes a first nozzle and a second nozzle.

[0032] The first nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source to supply air; and a flow path connected to the urea water supply path to spray the urea water.

[0033] The first nozzle is disposed on the upstream side within the selective reduction catalyst unit.

[0034] The second nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source for supplying air; and a flow path connected to the ammonia water supply path for spraying the ammonia water.

[0035] The second nozzle is disposed on the upstream side within the selective reduction catalyst unit.

[0036] 4. In the ammonia treatment apparatus described in 1, the ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit reaches the selective reduction catalyst unit in a manner independent of the urea water supply path for supplying the urea water to the selective reduction catalyst unit.

[0037] The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle.

[0038] The nozzle includes a first nozzle and a second nozzle.

[0039] The first nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source to supply air; and a flow path connected to the urea water supply path to spray the urea water.

[0040] The first nozzle is disposed on the upstream side within the selective reduction catalyst unit.

[0041] The second nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source for supplying air; and a flow path connected to the ammonia water supply path for spraying the ammonia water.

[0042] The second nozzle is disposed in the exhaust receiver through which the exhaust gas passes before reaching the selective reduction catalyst unit, and supplies the air and the ammonia water into the selective reduction catalyst unit through the exhaust receiver.

[0043] 5. In the ammonia treatment apparatus described in 1, the ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit merges with the urea water supply path for supplying the urea water to the selective reduction catalyst unit before reaching the selective reduction catalyst unit.

[0044] Either the urea solution or the ammonia solution is supplied to the selective reduction catalyst unit through a nozzle.

[0045] The nozzle is a dual-fluid nozzle, comprising: a flow path connected to an air supply source to supply air; and a flow path connecting the urea water supply path and the ammonia water supply path after they merge, for spraying the urea water or the ammonia water.

[0046] The nozzle is positioned upstream of the selective reduction catalyst unit.

[0047] 6. The ammonia treatment apparatus described in any one of 1 to 4 includes an instrument for measuring the density of the ammonia solution.

[0048] The selective reduction catalyst unit is simultaneously supplied with the urea solution and the ammonia solution.

[0049] The density of the ammonia solution, measured by an instrument measuring the density of the ammonia solution, is converted into the concentration of the ammonia solution. Based on this concentration, the molar equivalent of the ammonia solution supplied to the selective reduction catalyst unit is calculated.

[0050] Based on the known concentration of the urea solution, the molar equivalent of the urea solution supplied to the selective reduction catalyst unit is calculated.

[0051] The molar equivalents of ammonia and urea supplied to the selective reduction catalyst unit are added together, and the flow rates of the urea and ammonia are adjusted according to the resulting molar equivalents as a harmless treatment to denitrify the waste gas.

[0052] 7. In the ammonia treatment apparatus described in any one of 1 to 5, liquefied ammonia supplied from the ship's fuel supply device merges with an ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit, wherein the ammonia water and the liquefied ammonia are mixed to generate ammonia water, which is then supplied to the selective reduction catalyst unit.

[0053] The ammonia treatment device includes an instrument for measuring the density of the ammonia solution obtained by mixing the ammonia water and the liquefied ammonia.

[0054] Based on the density of the ammonia water measured by an instrument measuring the density of the ammonia water, the molar equivalent of the ammonia water supplied to the selective reduction catalyst unit is calculated, and the flow rate of the ammonia water is adjusted according to the calculated molar equivalent as a harmless treatment to denitrify the waste gas.

[0055] 8. The ammonia treatment apparatus described in any one of items 1 to 5 includes an instrument for measuring the concentration of leaked ammonia in the waste gas.

[0056] The exhaust gas flow rate of the power machinery is measured, and the ammonia leakage amount is calculated based on the measured exhaust gas flow rate and the ammonia leakage concentration, or based on the exhaust gas flow rate and the ammonia leakage concentration calculated according to the output and load information of the power machinery.

[0057] The flow rate of the urea solution or the ammonia solution is adjusted so that the sum of the amount of ammonia supplied to the selective reduction catalyst unit by the urea solution and / or the ammonia solution and the amount of ammonia leakage becomes the amount of ammonia treated in the selective reduction catalyst unit as the harmless treatment, and the waste gas is denitrified.

[0058] 9. In any one of the ammonia treatment apparatuses described in 1 to 5, an ammonia slip catalyst is provided within the selective reduction catalyst unit.

[0059] The ammonia water supplied to the selective reduction catalyst unit is rendered harmless by the ammonia escape catalyst.

[0060] 10. An ammonia treatment method for treating ammonia in a ship that carries liquefied ammonia as fuel for the power machinery of the cargo ship or the ship and has a selective reduction catalyst unit.

[0061] Within the selective reduction catalyst unit, the exhaust gas from the ship's power machinery is supplied with urea water as a reducing agent, and a selective reduction catalyst is provided to denitrify the exhaust gas.

[0062] Ammonia water is generated by vaporizing liquefied ammonia remaining in the fuel supply line of the ship's power machinery, or by dissolving ammonia volatilized from the cargo in clean water using a pest control device.

[0063] The ammonia water generated by the removal device is supplied to the selective reduction catalyst unit to treat the ammonia water to render it harmless.

[0064] 11. In the ammonia treatment method described in 10, the urea solution and the ammonia solution are simultaneously supplied to the selective reduction catalyst unit.

[0065] The density of the ammonia solution is measured, and the measured density is converted into an ammonia concentration. Based on this concentration, the molar equivalent of ammonia solution supplied to the selective reduction catalyst unit is calculated.

[0066] Based on the known concentration of the urea solution, the molar equivalent of the urea solution supplied to the selective reduction catalyst unit is calculated.

[0067] The molar equivalents of ammonia and urea supplied to the selective reduction catalyst unit are added together, and the flow rates of the urea and ammonia are adjusted according to the resulting molar equivalents, as part of the denitrification treatment of the waste gas.

[0068] 12. In the ammonia treatment method described in 10, liquefied ammonia supplied from the ship's fuel supply device is merged with an ammonia supply path for supplying ammonia water to the selective reduction catalyst unit, so that the ammonia water and the liquefied ammonia are mixed to generate ammonia water, which is then supplied to the selective reduction catalyst unit.

[0069] The density of the ammonia solution formed by mixing the ammonia solution and the liquefied ammonia was measured.

[0070] Based on the measured density of the ammonia water, the molar equivalent of the ammonia water supplied to the selective reduction catalyst unit is calculated, and the flow rate of the ammonia water is adjusted according to the calculated molar equivalent to perform denitrification treatment on the waste gas as the harmless treatment.

[0071] 13. In the ammonia treatment method described in 10, an instrument for measuring the concentration of leaked ammonia in the waste gas is provided.

[0072] The amount of ammonia leakage is calculated based on the measured exhaust gas flow rate and the ammonia leakage concentration, or based on the exhaust gas flow rate and the ammonia leakage concentration calculated according to the output and load information of the power machinery.

[0073] The flow rate of the urea solution or the ammonia solution is adjusted so that the sum of the amount of ammonia supplied to the selective reduction catalyst unit by the urea solution and / or the ammonia solution and the amount of ammonia leakage becomes the amount of ammonia treated in the selective reduction catalyst unit, and the waste gas is denitrified as the harmless treatment.

[0074] 14. In the ammonia treatment method described in 10, an ammonia slip catalyst is provided in the selective reduction catalyst unit.

[0075] The ammonia water supplied to the selective reduction catalyst unit is rendered harmless by the ammonia escape catalyst.

[0076] Invention Effects

[0077] According to the present invention, an ammonia treatment apparatus and ammonia treatment method are provided, which can effectively treat ammonia gas inside the ship without discharging the ammonia gas volatilized from cargo or ammonia gas remaining in the fuel supply line of power machinery into water. This eliminates the need for additional ammonia supply tanks. Attached Figure Description

[0078] Figure 1 This is a structural block diagram showing the fuel supply device of a ship using the ammonia treatment device of the present invention.

[0079] Figure 2 This is a block diagram showing the structure of the ammonia treatment apparatus according to the first embodiment of the present invention.

[0080] Figure 3 This is a block diagram showing the structure of the ammonia treatment apparatus according to the second embodiment of the present invention.

[0081] Figure 4This is a schematic cross-sectional view showing the first configuration of the nozzle and selective reduction catalyst unit of the ammonia treatment apparatus applicable to the present invention.

[0082] Figure 5 This is a block diagram showing the structure of the ammonia treatment apparatus according to the third embodiment of the present invention.

[0083] Figure 6 This is a block diagram showing the structure of the ammonia treatment apparatus according to the fourth embodiment of the present invention.

[0084] Figure 7 This is a schematic cross-sectional view showing a second configuration of the nozzle and selective reduction catalyst unit of the ammonia treatment apparatus applicable to the present invention.

[0085] Figure 8 This is a schematic cross-sectional view showing the third configuration of the nozzle and selective reduction catalyst unit of the ammonia treatment apparatus applicable to the present invention.

[0086] Figure 9 This is a schematic cross-sectional view showing the fourth configuration of the nozzle and selective reduction catalyst unit of the ammonia treatment apparatus applicable to the present invention.

[0087] Figure 10 This is a schematic cross-sectional view showing the fifth configuration of the nozzle and selective reduction catalyst unit of the ammonia treatment apparatus applicable to the present invention.

[0088] Explanation of reference numerals in the attached figures

[0089] Detailed Implementation

[0090] Hereinafter, embodiments of the present invention will be described using the accompanying drawings. Various features shown in the following embodiments can be combined with each other.

[0091] The present invention relates to an ammonia treatment device for a ship carrying liquefied ammonia as cargo or ship propulsion fuel, and an ammonia treatment method performed in the ammonia treatment device.

[0092] (Structure of a ship's fuel supply system)

[0093] Figure 1 This is a structural block diagram showing the fuel supply device of a ship using the ammonia treatment apparatus of the present invention. Figure 1 In the diagram, solid lines represent the flow path of liquids, and dashed lines represent the flow path of gases.

[0094] like Figure 1As shown, the ship's fuel supply system includes a selective reduction catalyst (SCR) unit 17. The selective reduction catalyst (SCR) unit 17 contains a selective reduction catalyst (SCR) that uses selective catalytic reduction (SCR) to remove NO from engine exhaust gases. x It reacts with ammonia to perform denitrification.

[0095] The selective reduction catalyst unit 17 is connected to the exhaust pipe of the engine 3, which is the ship's power machinery, and the engine exhaust gas is introduced into the selective reduction catalyst unit 17. In addition, urea water, which serves as a reducing agent, stored in the urea water tank 8, is supplied to the selective reduction catalyst unit 17.

[0096] In addition, although not shown, an instrument (ammonia concentration meter) for measuring the concentration of leaked ammonia in the engine exhaust gas can be installed in the exhaust pipe of engine 3, and an instrument (gas flow meter) for measuring the gas flow rate of engine exhaust gas can also be installed.

[0097] Urea water stored in urea water tank 8 is supplied to selective reduction catalyst unit 17 via urea water delivery pipe 15, which serves as the urea water supply path, by urea water pump 15a. The urea water undergoes hydrolysis within the high-temperature selective reduction catalyst unit 17, generating ammonia gas. This ammonia gas is used to denitrify the engine exhaust gas. The denitrified exhaust gas is then released into the atmosphere.

[0098] On the other hand, in this fuel supply device, liquefied ammonia fuel is supplied from liquefied ammonia tank 1 to engine 3 via fuel supply lines (fuel supply device 2 and fuel piping 4). Engine 3 is driven by burning liquefied ammonia fuel.

[0099] Furthermore, in this fuel supply device, the following ammonia gas is treated by the decontamination device 6: ammonia gas and / or ammonia gas (residual gas) obtained from the vaporization of liquefied ammonia introduced from the fuel supply line, and ammonia gas and / or ammonia gas remaining in the fuel supply device 2 obtained from the vaporization of liquefied ammonia, or ammonia gas (evaporated gas) introduced from the cargo ammonia tank not shown.

[0100] The fuel supply line includes a fuel supply device 2 and a fuel piping 4, which is the path through which liquefied ammonia fuel is supplied to the engine 3 via a compressor or pump, heat exchanger, etc., in the fuel supply device 2. Alternatively, the fuel supply device 2 may be omitted if not needed. The fuel piping 4 may include a supply piping that supplies ammonia from the fuel supply device 2 to the engine 3, and a return piping that returns any remaining ammonia from the engine 3 to the fuel supply device 2. Although not shown, a switching valve may be provided on the liquefied ammonia tank 1 side of the fuel supply device 2 and the engine 3 side of the fuel piping 4, which can close the section between the liquefied ammonia tank 1 side of the fuel supply device 2 and the engine 3 side of the fuel piping 4.

[0101] The liquefied ammonia tank 1 stores ammonia as fuel for engines 3, etc. Ammonia is stored as liquefied ammonia in the liquefied ammonia tank 1. To maintain the liquid state of the liquefied ammonia, the interior of the liquefied ammonia tank 1 is kept at high pressure or low temperature. In cases where large quantities of liquefied ammonia are carried on ships due to long voyages or other reasons, the liquefied ammonia tank 1 is primarily made of thin-walled, easily manufactured, fully refrigerated (atmospheric pressure) or semi-refrigerated (semi-pressurized) ammonia tank. A suction pump 1a is installed inside the liquefied ammonia tank 1, which delivers the stored liquefied ammonia to the piping leading to the fuel supply device 2.

[0102] The cargo ammonia tank (not shown) stores liquefied ammonia as cargo, not as fuel for engines 3, etc. Similar to liquefied ammonia tank 1, the cargo ammonia tank maintains a high pressure or low temperature inside to preserve the liquid state of the liquefied ammonia. When a large amount of liquefied ammonia is carried on board a ship, thin-walled, easily manufactured, fully refrigerated (atmospheric pressure) or semi-refrigerated (semi-pressurized) ammonia tanks are primarily used as cargo ammonia tanks.

[0103] Liquefied ammonia fuel is supplied from liquefied ammonia tank 1 to engine 3 via fuel supply device 2. Alternatively, ignition fuel (from a heavy oil tank not shown) can also be supplied to engine 3. The ignition fuel burns together with the ammonia fuel when combustion begins, raising the temperature in the combustion chamber and ensuring proper combustion of the ammonia fuel. The supply of ignition fuel can be stopped when the combustion chamber reaches a state where combustion can be achieved solely with ammonia fuel. Furthermore, if engine 3 can burn solely with ammonia fuel from startup, ignition fuel is not required.

[0104] Furthermore, engine 3 can also be a dual-fuel engine that uses fossil fuels such as liquefied ammonia fuel and heavy oil. In a dual-fuel engine, it is possible to selectively switch between a mode in which fossil fuels such as heavy oil are used as the ignition source and liquefied ammonia fuel is supplied as the main fuel, and a fossil fuel mode in which fossil fuels are used as the only fuel.

[0105] Nitrogen gas is supplied from nitrogen supply device 51 to fuel line 4 via purge gas supply valve 50. This nitrogen gas is also supplied to fuel supply device 2 via fuel line 4. This nitrogen gas is an inert gas used to purge ammonia and / or liquefied ammonia gas remaining in fuel line 4 and fuel supply device 2 during engine start-up, shutdown, and emergency shutdown.

[0106] When the engine 3 starts, stops, or undergoes an emergency stop, the ammonia and / or ammonia gas obtained from the vaporization of residual liquefied ammonia is introduced from the fuel pipe 4 through the gas-liquid separator 4a and the purge gas discharge valve 5 into the purging device 6. Additionally, when the engine 3 starts, stops, undergoes an emergency stop, or is under maintenance, the ammonia and / or ammonia gas obtained from the vaporization of residual liquefied ammonia is also introduced from the fuel supply device 2 through the switching valve 2a into the purging device 6. Furthermore, a pump or the like is installed in the fuel supply device 2, and a gas-liquid separator is installed at the outlet of the ammonia and / or ammonia gas obtained from the vaporization of residual liquefied ammonia.

[0107] Furthermore, the gas introduced into the purging device 6 from the fuel pipe 4 and the fuel supply device 2 is a mixture of ammonia and a purging gas such as nitrogen. The treatment in this embodiment targets the ammonia component in the mixed gas.

[0108] When ammonia is introduced into the purging device 6, the section between the liquefied ammonia tank 1 side of the fuel supply device 2 and the engine 3 side of the fuel piping 4 is closed by a switching valve. Additionally, ammonia (evaporated gas) is also introduced into the purging device 6 from the cargo ammonia tank. Furthermore, nitrogen used for purging is discharged into the atmosphere through the purging device 6.

[0109] For example, clean water generated by the ship's water maker and stored in the clean water tank 22 is introduced into the pest control device 6 by the water supply pump 22a. Here, clean water refers to water that contains as few impurities and additives as possible, such as distilled water, ion-exchanged water, filtered water, etc.

[0110] The pest control device 6 is configured to include a water seal tank or a washing tank. The mixed gas of ammonia and nitrogen introduced into the pest control device 6 is introduced into the water seal tank or the washing tank.

[0111] In a water-sealed tank or washing tank, a mixture of ammonia and nitrogen is introduced and passed through clean water, or clean water is sprayed from above, causing the ammonia to dissolve in the water and form ammonia water. The nitrogen used for purging is released into the atmosphere from the purging device 6.

[0112] Water seal tanks or washing tanks are preferred as pest control devices.

[0113] When using a water seal tank, ammonia gas is introduced from the bottom of the tank and absorbed by the clean water stored in the tank, becoming ammonia water.

[0114] In addition, when using a washing tank, ammonia gas is introduced from the bottom of the washing tank and comes into contact with clean water sprayed from the top of the washing tank. As a result, the ammonia gas is absorbed by the clean water and becomes ammonia water.

[0115] Preferably, a water seal tank and a washing tank are provided together, and ammonia gas that evaporates again from the ammonia water generated in the water seal tank, as well as ammonia gas that is not completely absorbed by the water seal tank, is introduced into the lower part of the washing tank. Preferably, in the washing tank, ammonia gas that evaporates again from the ammonia water in the washing tank, as well as ammonia gas that is not completely absorbed, is sprayed again from the upper part of the washing tank and this process is repeated, which can further absorb ammonia gas that evaporates again from the ammonia water in the washing tank, as well as ammonia gas that is not completely absorbed. By providing a water seal tank and a washing tank together, ammonia gas can be reliably absorbed, thereby reliably preventing ammonia gas from being released outside the ship.

[0116] Furthermore, even when using only a water seal tank as the pest control device 6, ammonia gas volatilized from the ammonia water and ammonia gas not fully absorbed by the clean water can be reliably absorbed by introducing the circulation mechanism back into the lower part of the water seal tank, thereby reliably preventing ammonia gas from being released outside the ship.

[0117] Furthermore, even when only the washing tank is used as the pest control device 6, in order to further absorb the ammonia gas volatilized from the ammonia water and the ammonia gas that has not been completely absorbed by the clean water, a circulation mechanism is set up to spray the ammonia water accumulated in the washing tank from the top of the washing tank again, which can reliably absorb the ammonia gas and thus reliably prevent the ammonia gas from being released outside the ship.

[0118] The wastewater (ammonia water) from the pest control device 6 is transported by gravity to the ammonia water tank 7, where it is temporarily stored. Furthermore, the ammonia water tank 7 is preferably a closed pressurized tank to prevent ammonia gas from evaporating from the contained ammonia water. If the ammonia water tank 7 is not a closed pressurized tank, it is preferable to return any ammonia gas evaporating from the contained ammonia water to the pest control device 6 (water seal tank and / or washing tank).

[0119] The ammonia water temporarily stored in the ammonia water tank 7 is rendered harmless through denitrification treatment in the selective reduction catalyst unit 17. The ammonia water stored in the ammonia water tank 7 is supplied to the selective reduction catalyst unit 17 by the ammonia water pump 18a via the ammonia water delivery pipe 18, which serves as the ammonia water supply path. The ammonia water generates ammonia gas within the high-temperature selective reduction catalyst unit 17, and this ammonia gas is then reacted with NO in the engine exhaust gas. x The reaction occurs to render it harmless. Alternatively, the ammonia generated in the selective reduction catalyst unit 17 is rendered harmless by an ammonia escape catalyst (ASC) installed in the selective reduction catalyst unit 17.

[0120] Furthermore, the denitrification process in the selective reduction catalyst unit 17 is carried out in either the liquefied ammonia fuel-based operation mode or the fossil fuel mode.

[0121] The supply paths for ammonia water from ammonia water tank 7 to selective reduction catalyst unit 17, and for urea water from urea water tank 8 to selective reduction catalyst unit 17, will be described in the embodiments described later.

[0122] In addition, the structure of the selective reduction catalyst unit 17 and the structure of the nozzles that supply urea water and ammonia water to the selective reduction catalyst unit 17 will also be described later.

[0123] (First Implementation)

[0124] Figure 2 This is a block diagram illustrating the structure of an ammonia treatment apparatus according to a first embodiment of the present invention. The ammonia treatment method of the first embodiment of the present invention is performed in this ammonia treatment apparatus.

[0125] In the ammonia treatment apparatus of this embodiment, the urea water stored in the urea water tank 8 is measured by the LIT8a (hereinafter referred to as "liquid level gauge 8a") and sent from the urea water tank 8 to the urea water delivery pipe 15 by the urea water pump 15a.

[0126] Urea water from urea water tank 8 can be supplied to selective reduction catalyst unit 17 via a first switching valve 16, urea water flow regulating valve 19, and FT20 (hereinafter referred to as "urea water flow meter 20") located on urea water delivery pipe 15. Urea water flow regulating valve 19 operates according to the measurement results of urea water flow meter 20.

[0127] The urea water delivery pipe 15 branches between the urea water pump 15a and the urea water flow regulating valve 19, and the branch pipe returns to the urea water tank 8 via the urea water circulation valve 21. The urea water circulation valve 21 is a back pressure valve (automatic regulator). The urea water circulation valve 21 opens when the pressure in the urea water delivery pipe 15 exceeds a specified pressure, limiting the pressure in the urea water delivery pipe 15 to below the specified pressure. Alternatively, the urea water circulation valve 21 can also be a pressure reducing valve.

[0128] Urea water delivery pipe 15 merges with ammonia water delivery pipe 18, which serves as the supply path for ammonia water, before reaching the selective reduction catalyst unit 17. The piping after the merging of urea water delivery pipe 15 and ammonia water delivery pipe 18 is either urea water or ammonia water delivery pipe 28.

[0129] The ammonia water stored in the ammonia water tank 7 is measured by LIT7a (hereinafter referred to as "liquid level gauge 7a") and is sent from the ammonia water tank 7 to the ammonia water delivery pipe 18 by the ammonia water pump 18a.

[0130] Ammonia water from ammonia tank 7 is supplied to selective reduction catalyst unit 17 via a second switching valve 9 installed on ammonia water delivery pipe 18, FD10 (hereinafter referred to as "flow density meter 10"), FT11 (hereinafter referred to as "ammonia water flow meter 11") which are instruments for measuring the density of ammonia water, and a third switching valve 12. Flow density meter 10 is a Coriolis flow meter capable of measuring the flow rate and density of ammonia water.

[0131] The ammonia delivery pipe 18 branches between the flow density meter 10 and the ammonia flow meter 11, and the branch pipe returns to the ammonia tank 7 via the ammonia circulation valve 14. The ammonia circulation valve 14 is a back pressure valve (automatic regulator). The ammonia circulation valve 14 opens when the pressure in the ammonia delivery pipe 18 exceeds a specified pressure, limiting the pressure in the ammonia delivery pipe 18 to below the specified pressure. Alternatively, the ammonia circulation valve 14 can also be a pressure reducing valve.

[0132] The ammonia water delivery pipe 18 merges with the urea water delivery pipe 15 before reaching the selective reduction catalyst unit 17. The piping after the urea water delivery pipe 15 and the ammonia water delivery pipe 18 merge is the urea water or ammonia water delivery pipe 28.

[0133] Air is supplied from air supply source 25 to urea water or ammonia water supply pipe 28, and is supplied together with urea water or ammonia water into the selective reduction catalyst unit 17. The pressure inside urea water or ammonia water supply pipe 28 is measured by PT24 (hereinafter referred to as "pressure gauge 24"). The temperature inside selective reduction catalyst unit 17 is measured by TT26 (hereinafter referred to as "thermometer 26").

[0134] Furthermore, the ammonia water circulation valve 14 and the urea water circulation valve 21 can also be flow regulating valves that operate based on the measurement results of the pressure gauge 24. Alternatively, the flow rate of urea water and ammonia water can be adjusted by using a frequency converter to adjust the pump speed according to the load of the engine 3.

[0135] Air and urea solution, or air and ammonia solution, are supplied to the selective reduction catalyst unit 17 through nozzle 13. The construction of the selective reduction catalyst unit 17 and the shape of the nozzle 13 will be described later.

[0136] In addition, the pest control device 6, the ammonia tank 7 and the urea tank 8 are located outside the ship's machinery room, and the selective reduction catalyst unit 17 is located inside the ship's machinery room.

[0137] In this embodiment, in marine areas where the emission limits for marine diesel engines are Tier 3, urea solution is supplied to the selective reduction catalyst unit 17 for denitrification treatment. In marine areas where the emission limits are Tier 2, ammonia solution is supplied to the selective reduction catalyst unit 17 and the ammonia solution is subjected to harmless treatment. In the harmless treatment of the ammonia solution, it is not necessary to remove nitrogen oxides (NOx) from the engine exhaust gas. x All of them undergo denitrification treatment.

[0138] When supplying ammonia water to the selective reduction catalyst unit 17, the concentration of ammonia water is calculated based on the density of the ammonia water measured by the flow density meter 10, and the output of the ammonia water pump 18a is adjusted according to the concentration. This allows for concentration management of the ammonia water supplied to the selective reduction catalyst unit 17, thereby enabling the complete neutralization of the supplied ammonia water within the selective reduction catalyst unit 17.

[0139] The supply of urea water and / or ammonia water in the ammonia treatment unit is, for example, carried out in the following manner.

[0140] (1) Supply within Tier 3 sea areas

[0141] In the ammonia treatment device of this embodiment, in a Tier 3 sea area, the engine 3 is started, and if the temperature in the selective reduction catalyst unit 17, as measured by the thermometer 26, is high enough, a reducing agent is supplied to the selective reduction catalyst unit 17 to perform denitrification treatment.

[0142] Preferably, as a reducing agent, ammonia water generated by the purification device 6 is supplied whenever it is available; if the ammonia water is insufficient, urea water is supplied instead. By prioritizing the treatment of ammonia water, the consumption of urea water can be reduced. Furthermore, the capacity of the urea water tank can be reduced.

[0143] The supply of ammonia water is adjusted as follows: the density of ammonia water in the ammonia water delivery pipe 18 is measured by the flow density meter 10 and converted into ammonia water concentration, and the third switch valve 12 is operated according to the ammonia water concentration.

[0144] In addition, it is necessary to determine in advance the concentration and flow rate of the supplied ammonia water and the nitrogen oxides (NOx) in the engine exhaust. x The relationship between the processing volume of ).

[0145] If the ammonia level in ammonia tank 7 is above the low level (L), the ammonia pump 18a is started, and the second switch valve 9 and the third switch valve 12 are opened to supply ammonia.

[0146] The flow rate of ammonia water is adjusted so that the amount of ammonia water supplied to the selective reduction catalyst unit 17 is the necessary and sufficient amount for denitrification treatment within the selective reduction catalyst unit 17, calculated based on the molar equivalent of ammonia water.

[0147] Furthermore, in the operation mode where liquefied ammonia fuel is the primary fuel, since leaked ammonia from the engine exhaust enters the selective reduction catalyst unit 17, the amount of ammonia water supplied is the amount obtained by subtracting the amount of leaked ammonia.

[0148] In this case, an instrument (ammonia concentration meter) for measuring the concentration of leaked ammonia in the engine exhaust is preferred. That is, the amount of ammonia leakage is calculated based on the exhaust flow rate calculated from the output and load information of engine 3 and the ammonia leakage concentration measured by the instrument. The load information refers to the relationship between the output of engine 3 and the exhaust flow rate, which must be determined in advance. Based on this load information, the exhaust flow rate is calculated from the output of engine 3. Furthermore, the load information varies depending on whether the operating mode is primarily liquefied ammonia fuel or fossil fuel, and whether the navigation area is Tier 3 or Tier 2, so it must be determined for each situation.

[0149] Alternatively, an instrument (gas flow meter) can be installed to measure the exhaust gas flow rate of engine 3, and the amount of ammonia leakage can be calculated based on the exhaust gas flow rate and ammonia leakage concentration measured by the instrument.

[0150] When both urea solution and ammonia solution are supplied simultaneously, the flow rate of ammonia solution is adjusted by subtracting the amount of ammonia leakage from the amount of ammonia supplied to the selective reduction catalyst unit 17, with this amount of ammonia supplied by the ammonia solution. Furthermore, any shortfall in the amount of ammonia necessary for the denitrification treatment of the exhaust gas in the selective reduction catalyst unit 17 is supplemented with ammonia supplied by the urea solution. Moreover, ammonia supply from the urea solution refers to the hydrolysis of the urea solution within the selective reduction catalyst unit 17 due to the heat of the exhaust gas, thereby generating ammonia.

[0151] That is, when urea water and ammonia water are supplied at the same time, the flow rate of ammonia water is adjusted so that the total amount of ammonia supplied to the selective reduction catalyst unit 17 by urea water and ammonia water and the amount of ammonia leakage becomes the amount of ammonia that is treated in the selective reduction catalyst unit 17 as a harmless treatment, and the waste gas is denitrified.

[0152] When only urea water is supplied, the flow rate of the urea water is adjusted by subtracting the amount of ammonia leakage from the amount of ammonia supplied to the selective reduction catalyst unit 17, with this amount of ammonia supplied by the urea water. Through this flow rate adjustment, the amount of ammonia supplied to the selective reduction catalyst unit 17 becomes the necessary and sufficient amount of ammonia for the denitrification treatment of the waste gas.

[0153] That is, when only urea water is supplied, the flow rate of urea water is adjusted so that the sum of the amount of ammonia supplied to the selective reduction catalyst unit 17 by urea water and the amount of ammonia leakage becomes the amount of ammonia that is treated in the selective reduction catalyst unit 17, thereby denitrifying the waste gas.

[0154] In addition, nitrogen oxides (NOx) in engine exhaust can also be measured. x The amount of ammonia is measured, and the flow rate of the ammonia water is adjusted based on the measurement results.

[0155] If the ammonia level in ammonia tank 7 falls below the minimum level (LL), the ammonia pump 18a will stop, thereby stopping the supply of ammonia.

[0156] In this embodiment, when urea water is supplied, the ammonia water pump 18a is stopped, the urea water pump 15a is started, the first switch valve 16 is opened, the urea water is supplied, and the flow rate of the urea water is adjusted so that the amount of urea water supplied is the necessary and sufficient amount for denitrification treatment in the selective reduction catalyst unit 17, calculated based on the molar equivalent of urea water.

[0157] Since the concentration of the urea solution is known, the molar equivalent of the supplied urea solution can be calculated based on this concentration. In other words, based on the molar equivalent of the urea solution in the urea solution delivery pipe 15, the flow rate of the urea solution in the urea solution delivery pipe 15 is measured by the urea solution flow meter 20, and the urea solution flow regulating valve 19 is adjusted, thereby adjusting the supply amount of urea solution.

[0158] In addition, nitrogen oxides (NOx) in engine exhaust can also be measured. x The amount of urea is measured, and the urea flow rate regulating valve 19 is adjusted based on the measurement result.

[0159] (2) Supply within Tier 2 sea areas

[0160] Within Tier 2 sea areas, only ammonia water is supplied for harmless treatment or denitrification. That is, within Tier 2 sea areas, urea water pump 15a is stopped, thereby ceasing the supply of urea water.

[0161] If the ammonia level in ammonia tank 7 is above the low level (L), the ammonia pump 18a is started, and the second switch valve 9 and the third switch valve 12 are opened to supply ammonia.

[0162] The flow rate of ammonia water is adjusted so that the amount of ammonia water supplied to the selective reduction catalyst unit 17 is below the amount necessary for denitrification treatment in the selective reduction catalyst unit 17, calculated based on the molar equivalent of ammonia water.

[0163] Furthermore, in the operation mode where liquefied ammonia fuel is the primary fuel, since leaked ammonia from the engine exhaust enters the selective reduction catalyst unit 17, the amount of ammonia water supplied is the amount obtained by subtracting the amount of leaked ammonia.

[0164] In this case, it is preferable to have an instrument (ammonia concentration meter) for measuring the concentration of leaked ammonia in the engine exhaust gas. That is, the amount of ammonia leakage is calculated based on the exhaust gas flow rate calculated according to the output and load information of engine 3 and the ammonia leakage concentration measured by the instrument. Alternatively, an instrument (gas flow meter) for measuring the exhaust gas flow rate of engine 3 may also be provided, and the amount of ammonia leakage is calculated based on the exhaust gas flow rate and ammonia leakage concentration measured by the instrument.

[0165] Within Tier 2 sea areas, since only ammonia water is supplied, the flow rate of ammonia water is adjusted by subtracting the amount of ammonia leakage from the amount of ammonia water supplied to the selective reduction catalyst unit 17, with this amount of ammonia water being supplied in a manner that ensures the supply of ammonia water. Through this flow rate adjustment, the amount of ammonia water supplied to the selective reduction catalyst unit 17 is made up to the amount of ammonia water within the denitrification treatment capacity of the selective reduction catalyst unit 17.

[0166] That is, the flow rate of ammonia water is adjusted so that the total amount of ammonia supplied to the selective reduction catalyst unit 17 and the amount of ammonia leakage becomes the amount of ammonia treated in the selective reduction catalyst unit 17, and the waste gas is denitrified as a harmless treatment.

[0167] In addition, when using the ammonia escape catalyst (ASC) 17c described later, the flow rate of ammonia water is adjusted so that the amount of ammonia water supplied to the selective reduction catalyst unit 17 is a supply amount below the processing capacity of the ammonia escape catalyst (ASC) 17c, calculated based on the molar equivalent of ammonia water.

[0168] As described above, the ammonia supply is adjusted as follows: the density of the ammonia in the ammonia delivery pipe 18, measured by the flow density meter 10, is converted into an ammonia concentration; the flow rate of the ammonia flowing through the ammonia delivery pipe 18 is measured by the flow density meter 10; and the third switching valve 12 is operated according to the ammonia concentration. Furthermore, the concentration and flow rate of the supplied ammonia must be known in advance in relation to the nitrogen oxides (NOx) in the engine exhaust gas. x The relationship between the processing volume of ).

[0169] If the ammonia level in ammonia tank 7 falls below the minimum level (LL), the ammonia pump 18a will stop, thereby stopping the supply of ammonia.

[0170] (Second Implementation)

[0171] Figure 3This is a block diagram illustrating the structure of an ammonia treatment apparatus according to a second embodiment of the present invention. The ammonia treatment method according to the second embodiment of the present invention is performed in this ammonia treatment apparatus.

[0172] like Figure 3 As shown, this embodiment is based on the first embodiment ( Figure 2 The mixture is provided with a mixer 29 for mixing the added liquefied ammonia with the ammonia water supplied from the purifying device 6, and an FD10b (hereinafter referred to as "second flow density meter 10b") for measuring the density of the ammonia water. The second flow density meter 10b is a Coriolis flow meter that can measure the flow rate and density of the ammonia water after mixing with the added liquefied ammonia.

[0173] In this ammonia processing device, downstream of the third switch valve 12 of the ammonia water delivery pipe 18, liquefied ammonia supplied from the fuel supply device 2 merges with ammonia water. The liquefied ammonia is supplied from the fuel supply device 2 to the ammonia water delivery pipe 18 via the liquefied ammonia back pressure valve (automatic regulator) 31 and the liquefied ammonia flow meter 32.

[0174] The mixer 29 receives ammonia water after merging with liquefied ammonia, mixing the liquefied ammonia and ammonia water to generate ammonia water. Cooling water, which cools the ammonia water delivery pipe 18 from the outside, is supplied to the mixer 29 to ensure proper mixing. The ammonia water delivery pipe 18, which delivers the ammonia water through the mixer 29, merges with the urea water delivery pipe 15 after passing through the second flow density meter 10b and the check valve 30. The piping after the merging of the urea water delivery pipe 15 and the ammonia water delivery pipe 18 is the urea water or ammonia water delivery pipe 28.

[0175] A check valve 33 is installed downstream of the urea water flow meter 20, which is located on the urea water delivery pipe 15.

[0176] In this embodiment, in marine areas where emissions from marine diesel engines are limited to Tier 3, urea solution or ammonia solution is supplied to the selective reduction catalyst unit 17 for denitrification treatment. In marine areas where emissions are limited to Tier 2, ammonia solution is supplied to the selective reduction catalyst unit 17 and the ammonia solution is subjected to harmless treatment. In the harmless treatment of ammonia solution, it is not necessary to remove nitrogen oxides (NOx) from the engine exhaust gas. x All of them undergo denitrification treatment.

[0177] In the denitrification process, when the concentration and / or flow rate of ammonia water is insufficient, the pressure of liquefied ammonia supplied from fuel supply device 2 is increased, allowing liquefied ammonia to be mixed with ammonia water via liquefied ammonia back pressure valve 31 and liquefied ammonia flow meter 32. The supply of liquefied ammonia is adjusted by measuring the flow rate of liquefied ammonia via liquefied ammonia flow meter 32, measuring the flow rate and density of ammonia water upstream and downstream of mixer 29 via flow density meter 10 and second flow density meter 10b, and adjusting the liquefied ammonia supply pressure from fuel supply device 2 to regulate the flow rate through liquefied ammonia back pressure valve 31. By mixing with liquefied ammonia, the ammonia water supplied to selective reduction catalyst unit 17 reaches the necessary and sufficient concentration for denitrification.

[0178] In this case, the consumption of urea solution can be reduced.

[0179] The supply of urea water and / or ammonia water in the ammonia treatment unit is, for example, carried out in the following manner.

[0180] (1) Supply within Tier 3 sea areas

[0181] In the ammonia treatment apparatus of this embodiment, the supply of reducing agent from the Tier 3 sea area is the same as in the first embodiment ( Figure 2 )same.

[0182] However, in this embodiment, when the concentration of ammonia water generated by the pest control device 6 is insufficient, the additional liquefied ammonia is mixed by the mixer 29.

[0183] In this embodiment, it is preferable that, as a reducing agent, ammonia water generated by the purification device 6 is supplied whenever it is stored; if the ammonia water is insufficient, liquefied ammonia or urea water is added. By prioritizing the treatment of ammonia water, the consumption of urea water can be reduced. Furthermore, the capacity of the urea water tank can be reduced.

[0184] The density of the ammonia solution mixed with the added liquefied ammonia was measured by the second flow density meter 10b.

[0185] That is, the supply of ammonia water is adjusted in the following way: based on the density of ammonia water in the ammonia water delivery pipe 18 measured by the flow density meter 10, the amount of liquefied ammonia to be added is calculated, the density of ammonia water in the ammonia water delivery pipe 18 after the addition is measured by the second flow density meter 10b and converted into ammonia water concentration, and the third switch valve 12 is operated according to the ammonia water concentration.

[0186] In this embodiment, within the Tier 3 sea area, when supplying urea solution, the adjustment of the urea solution supply amount is the same as in the first embodiment (…). Figure 2 )same.

[0187] (2) Supply within Tier 2 sea areas

[0188] In this embodiment, within the Tier 2 sea area, only ammonia water is supplied, and the adjustment of the ammonia water supply amount is the same as in the first embodiment (…). Figure 2 )same.

[0189] In this case, since no additional liquefied ammonia is added, the amount of ammonia supplied to the selective reduction catalyst unit 17 can be adjusted in accordance with the first embodiment ( Figure 2 Similarly, the concentration of ammonia water is calculated based on the density of ammonia water measured by flow density meter 10, and the output of ammonia water pump 18a is adjusted according to the concentration.

[0190] (Construction of nozzle and selective reduction catalyst unit (1))

[0191] Figure 4 This indicates that it is applicable to the first embodiment ( Figure 2 ) and the second implementation method ( Figure 3 A schematic cross-sectional view of the first structure of the nozzle and selective reduction catalyst unit of the ammonia treatment device.

[0192] like Figure 4 As shown, the exhaust gas from engine 3 is introduced into the selective reduction catalyst unit 17 from the combustion chamber 3a of engine 3 via the exhaust receiver 27. The exhaust gas passing through the exhaust receiver 27 causes the turbine of turbocharger 52 to rotate and is then discharged into the atmosphere. The intake air compressed by the turbine of turbocharger 52 is supplied to the combustion chamber 3a. The selective reduction catalyst unit 17 is equipped with two stages of selective reduction catalyst (SCR) 17a and 17b: an upstream (inlet side) stage and a downstream (exhaust side) stage. By providing multiple stages of selective reduction catalyst, the function of each catalyst can be easily distinguished, and sufficient reaction area can be ensured without increasing the size of the selective reduction catalyst unit 17. Alternatively, the selective reduction catalyst may not be multi-stage.

[0193] Within the selective reduction catalyst unit 17, the nozzle 13 that supplies urea water or ammonia water along with air is a dual-fluid nozzle comprising two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the urea water or ammonia water delivery pipe 28 to spray urea water or ammonia water.

[0194] The nozzle 13 supplies air from upstream of the selective reduction catalyst 17a via a flow path for supplying air, and sprays urea water or ammonia water from upstream of the selective reduction catalyst 17a via a flow path for spraying urea water or ammonia water.

[0195] In this nozzle 13, both ammonia and urea water can be sprayed from the central axis of the selective reduction catalyst unit 17, thus achieving uniform diffusion. Furthermore, only one nozzle 13 (one port) is required within the selective reduction catalyst unit 17, resulting in a simple construction.

[0196] (Third Implementation)

[0197] Figure 5 This is a block diagram illustrating the structure of an ammonia treatment apparatus according to a third embodiment of the present invention. The ammonia treatment method according to the third embodiment of the present invention is performed in this ammonia treatment apparatus.

[0198] like Figure 5 As shown, in this embodiment, the first embodiment ( Figure 2 The urea water delivery pipe 15 and the ammonia water delivery pipe 18 are connected to the nozzle 13 independently so that they do not merge.

[0199] In this ammonia treatment unit, the urea water flow regulating valve 19 operates based on the measurements from the urea water flow meter 20 and the flow density meter 10. This is to ensure that the combined molar equivalent of the supplied urea water and ammonia water is equal to the molar equivalent under the condition of supplying only urea water. The molar equivalent under the condition of supplying only urea water is the necessary and sufficient molar equivalent for denitrification treatment in the selective reduction catalyst unit 17.

[0200] In this embodiment, pressure gauge 24 measures the pressure inside urea water delivery pipe 15. The pressure inside ammonia water delivery pipe 18 is measured by PT23 (hereinafter referred to as "ammonia water pressure gauge 23").

[0201] Air supply source 25 supplies air to the selective reduction catalyst unit 17 along with urea water to the urea water delivery pipe 15, and supplies air to the selective reduction catalyst unit 17 along with ammonia water to the ammonia water delivery pipe 18.

[0202] Furthermore, the air supply source 25 can also supply air directly to the nozzle 13 via a single pipe, instead of supplying it to the urea water delivery pipe 15 and the ammonia water delivery pipe 18. In the fourth embodiment described later... Figure 6 The same applies to ( ).

[0203] In this embodiment, urea solution and ammonia solution can be supplied simultaneously and sprayed at the same time. In this embodiment, in marine areas where emission limits for marine diesel engines are Tier 3, urea solution and / or ammonia solution are supplied to the selective reduction catalyst unit 17 for denitrification treatment; in marine areas where emissions are Tier 2, ammonia solution is supplied to the selective reduction catalyst unit 17 and the ammonia solution is subjected to harmless treatment. In the harmless treatment of ammonia solution, it is not necessary to treat nitrogen oxides (NOx) in the engine exhaust gas. x All of them undergo denitrification treatment.

[0204] When supplying ammonia water to the selective reduction catalyst unit 17, the concentration of ammonia water is calculated based on the density of ammonia water measured by the flow density meter 10, and the output of the ammonia water pump 18a is adjusted according to the concentration. This enables the concentration management of the ammonia water supplied to the selective reduction catalyst unit 17, in which all the supplied ammonia water can be rendered harmless.

[0205] The supply of urea water and / or ammonia water in the ammonia treatment unit is, for example, carried out in the following manner.

[0206] (1) Supply within Tier 3 sea areas

[0207] In the ammonia treatment device of this embodiment, in Tier 3 marine areas, urea water and ammonia water can be supplied simultaneously for denitrification treatment.

[0208] In this embodiment, it is preferable that, as a reducing agent, ammonia water generated by the purifying device 6 is supplied whenever it is available, and urea water is supplied simultaneously if the ammonia water is insufficient. By prioritizing the treatment of ammonia water, the consumption of urea water can be reduced. Furthermore, the capacity of the urea water tank can also be reduced.

[0209] In this embodiment, urea pump 15a and ammonia pump 18a are started to supply urea water and ammonia water simultaneously. The flow rates of urea water and ammonia water are adjusted so that the total supply of urea water and ammonia water to the selective reduction catalyst unit 17 is a sufficient and necessary amount for denitrification treatment within the selective reduction catalyst unit 17, calculated based on the total molar equivalent of urea water and ammonia water.

[0210] The total molar equivalent of urea water and ammonia water necessary and sufficient for denitrification treatment in the selective reduction catalyst unit 17 is equal to the molar equivalent of urea water that should be supplied if only urea water is supplied to the selective reduction catalyst unit 17.

[0211] Furthermore, the total supply of urea solution and ammonia solution can also be such that the supply of either urea solution or ammonia solution is 0 (no supply). When urea solution and ammonia solution are not sprayed simultaneously, the supply of either urea solution or ammonia solution is 0 (no supply).

[0212] When the ammonia supply is 0 (no supply), the ammonia pump 18a is stopped, and only urea solution is supplied. In this case, the adjustment of the urea solution supply is the same as in the first embodiment. Figure 2 )same.

[0213] When the supply of urea solution is 0 (no supply), the urea solution pump 15a is stopped, and only ammonia solution is supplied. In this case, the adjustment of the ammonia solution supply is the same as in the first embodiment ( Figure 2 )same.

[0214] (2) Supply within Tier 2 sea areas

[0215] In this embodiment, within the Tier 2 sea area, only ammonia water is supplied, and the adjustment of the ammonia water supply amount is the same as in the first embodiment (…). Figure 2 )same.

[0216] (Fourth Implementation)

[0217] Figure 6 This is a block diagram illustrating the structure of an ammonia treatment apparatus according to a fourth embodiment of the present invention. The ammonia treatment method according to the fourth embodiment of the present invention is performed in this ammonia treatment apparatus.

[0218] like Figure 6 As shown, this embodiment is based on the third embodiment ( Figure 5 The settings in the second implementation method are consistent with those in the second implementation method. Figure 3 Similarly, the mixture is obtained by mixing the added liquefied ammonia with the ammonia water supplied from the purging device 6 using a mixer 29 and a second flow density meter 10b. The second flow density meter 10b is a Coriolis flow meter, capable of measuring the flow rate and density of the ammonia water after mixing with the added liquefied ammonia.

[0219] In this ammonia processing device, downstream of the third switch valve 12 of the ammonia water delivery pipe 18, liquefied ammonia supplied from the fuel supply device 2 merges with ammonia water. The liquefied ammonia is supplied from the fuel supply device 2 to the ammonia water delivery pipe 18 via the liquefied ammonia back pressure valve (automatic regulator) 31 and the liquefied ammonia flow meter 32.

[0220] The mixer 29 is supplied with ammonia water after merging with liquefied ammonia, causing the liquefied ammonia and ammonia water to mix and generate ammonia water. Cooling water that cools the ammonia water delivery pipe 18 from the outside is supplied to the mixer 29. The ammonia water that has passed through the mixer 29 is delivered to the nozzle 13 through the check valve 30.

[0221] A check valve 33 is installed downstream of the urea water flow meter 20, which is located on the urea water delivery pipe 15.

[0222] In this embodiment, urea solution and ammonia solution can be sprayed simultaneously. In this embodiment, in marine areas where the emission limits for marine diesel engines are Tier 3, urea solution and / or ammonia solution are supplied to the selective reduction catalyst unit 17 for denitrification treatment; in marine areas where the emission limits are Tier 2, ammonia solution is supplied to the selective reduction catalyst unit 17 for harmless treatment or denitrification treatment.

[0223] In the denitrification process, when the concentration and / or flow rate of ammonia water is insufficient, the pressure of liquefied ammonia supplied from fuel supply device 2 is increased, causing the liquefied ammonia to merge with the ammonia water through liquefied ammonia back pressure valve 31 and liquefied ammonia flow meter 32. The supply of liquefied ammonia is adjusted by measuring the flow rate of liquefied ammonia through liquefied ammonia flow meter 32, measuring the flow rate and density of ammonia water through flow density meter 10, adjusting the liquefied ammonia supply pressure from fuel supply device 2, and regulating the flow rate through liquefied ammonia back pressure valve 31. Through mixing the liquefied ammonia, the ammonia water supplied to the selective reduction catalyst unit 17 reaches the necessary and sufficient concentration for denitrification.

[0224] In this case, the consumption of urea solution can be reduced.

[0225] The supply of urea water and / or ammonia water in the ammonia treatment unit is, for example, carried out in the following manner.

[0226] (1) Supply within Tier 3 sea areas

[0227] In this embodiment, within the Tier 3 sea area, when urea solution and ammonia solution are supplied simultaneously, the adjustment of the supply amounts of urea solution and ammonia solution is the same as in the third embodiment (…). Figure 5 )same.

[0228] However, the supply amount of ammonia to the selective reduction catalyst unit 17 is adjusted by calculating the ammonia concentration based on the density of the ammonia measured by the second flow-density meter 10, rather than based on the flow-density meter 10, and adjusting the output of the ammonia pump 18a accordingly. This is because there is a case where liquefied ammonia is added.

[0229] In this embodiment, it is preferable that, as a reducing agent, ammonia water generated by the purifying device 6 is supplied whenever it is stored; if the ammonia water is insufficient, liquefied ammonia is added and / or urea water is supplied simultaneously. By prioritizing the treatment of ammonia water, the consumption of urea water can be reduced. Furthermore, the capacity of the urea water tank can be reduced.

[0230] In this embodiment, within the Tier 3 sea area, when only urea solution is supplied, the adjustment of the urea solution supply amount is the same as in the first embodiment ( Figure 2 )same.

[0231] In this embodiment, within Tier 3 sea areas, when only ammonia is supplied, the adjustment of the ammonia supply amount is the same as in the second embodiment (…). Figure 3 The same applies. This is because there is a situation where additional liquefied ammonia is added.

[0232] (2) Supply within Tier 2 sea areas

[0233] In this embodiment, within the Tier 2 sea area, only ammonia water is supplied. The adjustment of the ammonia water supply amount is the same as in the second embodiment. Figure 3 )same.

[0234] In this case, since no additional liquefied ammonia is added, the amount of ammonia supplied to the selective reduction catalyst unit 17 can be adjusted in accordance with the first embodiment ( Figure 2 Similarly, the concentration of ammonia water is calculated based on the density of ammonia water measured by flow density meter 10, and the output of ammonia water pump 18a is adjusted according to the concentration.

[0235] (Construction of nozzle and selective reduction catalyst unit (2))

[0236] Figure 7 This indicates that it is applicable to the third implementation method ( Figure 5 ) and the fourth implementation method ( Figure 6 A schematic cross-sectional view of the second structure of the nozzle and selective reduction catalyst unit of the ammonia treatment device.

[0237] like Figure 7 As shown, nozzle 13 can be a three-fluid nozzle comprising the following three flow paths: a flow path connected to air supply source 25 to supply air; a flow path connected to ammonia water delivery pipe 18 to supply ammonia water; and a flow path connected to urea water delivery pipe 15 to supply urea water. In this structural example, the air supply flow path is used for both ammonia water diffusion and urea water diffusion.

[0238] The nozzle 13 supplies diffusion air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, sprays ammonia water through an ammonia water flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays urea water through a urea water flow path from upstream of the selective reduction catalyst 17a on the upstream side.

[0239] In this nozzle 13, both ammonia and urea water can be sprayed from the central axis of the selective reduction catalyst unit 17, thus achieving uniform diffusion. Furthermore, only one nozzle 13 (one port) is required within the selective reduction catalyst unit 17, resulting in a simple construction.

[0240] In this nozzle 13, since urea water and ammonia water are sprayed through dedicated flow paths, it can handle even if there is a large difference between the amount of ammonia water to be sprayed and the amount of urea water to be sprayed.

[0241] In the selective reduction catalyst unit 17 using nozzle 13, urea water and / or ammonia water are sprayed in sea areas where the emission limits for marine diesel engines are Tier 3, and ammonia water is sprayed in sea areas where the emission limits are Tier 2.

[0242] When ammonia is sprayed in Tier 3 marine areas, concentration management of the ammonia solution is required to ensure that there is a sufficient amount of ammonia necessary for denitrification treatment.

[0243] In this nozzle 13, the flow path for urea solution can be set to a high flow rate, while the flow path for ammonia solution can be set to a low flow rate. The air flow rate is adjusted by a regulating valve equipped with a flow meter, based on a signal indicating whether the mode is spraying urea solution or ammonia solution.

[0244] By using nozzle 13, a low-flow-rate mode that treats only ammonia water can be implemented in Tier 2 sea areas. In this case, urea water and ammonia water are not sprayed simultaneously.

[0245] In the above-described example of nozzle 13 structure, the air supply path is shared for the diffusion of ammonia and the diffusion of urea. However, it is not limited to this. It is also possible to provide separate air supply paths for the diffusion of ammonia and for the diffusion of urea.

[0246] That is, as nozzle 13, a three-fluid nozzle including the following four flow paths can also be used: a flow path connected to urea water delivery pipe 15 to spray urea water; a flow path connected to ammonia water delivery pipe 18 to spray ammonia water; a flow path with an opening connected to air supply source 25 to supply air for diffusing urea water; and a flow path with an opening connected to air supply source 25 to supply air for diffusing ammonia water.

[0247] The nozzle 13 supplies ammonia water diffusion air and ammonia water through the ammonia water diffusion air flow path and the ammonia water flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays urea water diffusion air and urea water through the urea water diffusion air flow path and the urea water flow path from upstream of the selective reduction catalyst 17a on the upstream side.

[0248] By using the nozzle 13, the supply of ammonia water diffusion air and ammonia water, as well as the supply of urea water diffusion air and urea water, can be changed according to the load of the engine 3.

[0249] (Construction of nozzle and selective reduction catalyst unit (3))

[0250] Figure 8 This indicates that it is applicable to the third implementation method ( Figure 5 ) and the fourth implementation method ( Figure 6 A schematic cross-sectional view of the third structure of the nozzle and selective reduction catalyst unit of the ammonia treatment device.

[0251] like Figure 8 As shown, the nozzle can be configured to include a first nozzle 13a and a second nozzle 13b.

[0252] The first nozzle 13a is a dual-fluid nozzle comprising two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the urea water delivery pipe 15 to spray urea water.

[0253] The second nozzle 13b is a dual-fluid nozzle comprising the following two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the ammonia water delivery pipe 18 to spray ammonia water.

[0254] The first nozzle 13a supplies air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays urea water through a urea water flow path from upstream of the selective reduction catalyst 17a on the upstream side.

[0255] The second nozzle 13b supplies air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays ammonia water through an ammonia water flow path from upstream of the selective reduction catalyst 17a on the upstream side.

[0256] Both the first nozzle 13a and the second nozzle 13b are arranged near the central axis of the selective reduction catalyst unit 17. With the central axis as the Z-axis, they can be arranged such that the X-axis direction and the Z-axis direction are the same but only the Y-axis direction is different, or the Y-axis direction and the Z-axis direction are the same but only the X-axis direction is different.

[0257] When using the first nozzle 13a and the second nozzle 13b described above, since urea water and ammonia water are sprayed from the dedicated first nozzle 13a and the second nozzle 13b respectively, urea water and ammonia water can be sprayed simultaneously, and it can cope with a large difference between the amount of ammonia water to be sprayed and the amount of urea water to be sprayed.

[0258] The spray volume of urea solution and ammonia solution can be adjusted according to the operating status of engine 3.

[0259] In the selective reduction catalyst unit 17 using nozzle 13, urea water and / or ammonia water are sprayed in sea areas where the emission limits for marine diesel engines are Tier 3, and ammonia water is sprayed in sea areas where the emission limits are Tier 2.

[0260] When ammonia is sprayed in Tier 3 marine areas, concentration management of the ammonia solution is required to ensure that there is a sufficient amount of ammonia necessary for denitrification treatment.

[0261] (Construction of nozzle and selective reduction catalyst unit (4))

[0262] Figure 9 This indicates that it is applicable to the third implementation method ( Figure 5 ) and the fourth implementation method ( Figure 6 A schematic cross-sectional view of the fourth structure of the nozzle and selective reduction catalyst unit of the ammonia treatment device.

[0263] like Figure 9 As shown, the nozzle may also include a first nozzle 13a and a second nozzle 13b, with the second nozzle 13b disposed within the exhaust receiver 27.

[0264] The first nozzle 13a is a dual-fluid nozzle comprising two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the urea water delivery pipe 15 to spray urea water.

[0265] The second nozzle 13b is a dual-fluid nozzle comprising the following two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the ammonia water delivery pipe 18 to spray ammonia water.

[0266] The first nozzle 13a supplies air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays urea water through a urea water flow path from upstream of the selective reduction catalyst 17a on the upstream side within the selective reduction catalyst unit 17.

[0267] The second nozzle 13b supplies air from upstream of the selective reduction catalyst 17a via an air flow path, and sprays ammonia water into the exhaust receiver 27 via an ammonia water flow path.

[0268] In the first nozzle 13a and the second nozzle 13b described above, ammonia water and urea water can both be sprayed from the central axis of the selective reduction catalyst unit 17, so they can be diffused evenly.

[0269] When using the first nozzle 13a and the second nozzle 13b described above, since urea water and ammonia water are sprayed from the dedicated first nozzle 13a and the second nozzle 13b respectively, urea water and ammonia water can be sprayed simultaneously, and it can cope with a large difference between the amount of urea water to be sprayed and the amount of ammonia water to be sprayed.

[0270] The spray volume of urea solution and ammonia solution can be adjusted according to the operating status of engine 3.

[0271] When using the first nozzle 13a and the second nozzle 13b, since the outlet temperature of the exhaust receiver 27 is higher than the inlet temperature of the selective reduction catalyst unit 17, the temperature drop of the exhaust gas can be suppressed even if the ammonia water is at a low concentration and the spray volume is large.

[0272] The first nozzle 13a and the second nozzle 13b described above are suitable for situations where the spray volume of ammonia water is less than 1 / 10 of the spray volume of urea water.

[0273] In the selective reduction catalyst unit 17 using nozzle 13, urea water and / or ammonia water are sprayed in sea areas where the emission limits for marine diesel engines are Tier 3, and ammonia water is sprayed in sea areas where the emission limits are Tier 2.

[0274] When ammonia is sprayed in Tier 3 marine areas, concentration management of the ammonia solution is required to ensure that there is a sufficient amount of ammonia necessary for denitrification treatment.

[0275] Furthermore, the first nozzle 13a, which sprays urea solution, can also be configured on the exhaust receiver 27 in the same way as the second nozzle 13b.

[0276] (Construction of nozzle and selective reduction catalyst unit (5))

[0277] Figure 10 This indicates that it is applicable to the third implementation method ( Figure 5 ) and the fourth implementation method ( Figure 6 A schematic cross-sectional view of the fifth structure of the nozzle and selective reduction catalyst unit of the ammonia treatment device.

[0278] like Figure 10 As shown, the nozzle may also include a first nozzle 13a and a second nozzle 13b, with the second nozzle 13b disposed upstream of the ammonia escape catalyst (ASC) 17c, which is provided in place of the selective reduction catalyst 17b on the downstream side.

[0279] The first nozzle 13a is a dual-fluid nozzle comprising two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the urea water delivery pipe 15 to spray urea water.

[0280] The second nozzle 13b is a dual-fluid nozzle comprising the following two flow paths: a flow path connected to the air supply source 25 to supply air; and a flow path connected to the ammonia water delivery pipe 18 to spray ammonia water.

[0281] The first nozzle 13a supplies air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays urea water through a urea water flow path from upstream of the selective reduction catalyst 17a on the upstream side within the selective reduction catalyst unit 17.

[0282] The second nozzle 13b supplies air through an air flow path from upstream of the selective reduction catalyst 17a on the upstream side, and sprays ammonia water through an ammonia water flow path from upstream of the ammonia escape catalyst (ASC) 17c, which is located downstream of the selective reduction catalyst 17a on the upstream side and is installed in place of the selective reduction catalyst 17b on the downstream side, within the selective reduction catalyst unit 17.

[0283] In the first nozzle 13a and the second nozzle 13b described above, ammonia water and urea water can both be sprayed from the central axis of the selective reduction catalyst unit 17, so they can be diffused evenly.

[0284] When using the first nozzle 13a and the second nozzle 13b described above, since urea water and ammonia water are sprayed from the dedicated first nozzle 13a and the second nozzle 13b respectively, urea water and ammonia water can be sprayed simultaneously, and it can cope with a large difference between the amount of ammonia water to be sprayed and the amount of urea water to be sprayed.

[0285] The spray volume of urea solution and ammonia solution can be adjusted according to the operating status of engine 3.

[0286] When using the first nozzle 13a and the second nozzle 13b described above, the nitrogen oxide reduction treatment is completed only by the selective reduction catalyst 17a on the upstream side, while the ammonia escape catalyst on the downstream side is dedicated to the treatment of ammonia water.

[0287] The first nozzle 13a and the second nozzle 13b described above are suitable for situations where the spray volume of ammonia water is less than 1 / 10 of the spray volume of urea water.

[0288] Furthermore, in this nozzle, the second nozzle 13b can also spray ammonia water upstream of the selective reduction catalyst 17a on the upstream side within the selective reduction catalyst unit 17. In this case, if there is excess ammonia gas in the denitrification process carried out by the selective reduction catalyst 17a, the ammonia gas is rendered harmless by the ammonia escape catalyst on the downstream side.

[0289] In the selective reduction catalyst unit 17 using nozzle 13, urea water and ammonia water are sprayed in sea areas where the emission limits for marine diesel engines are Tier 3, and ammonia water is sprayed in sea areas where the emission limits are Tier 2.

[0290] In the selective reduction catalyst unit 17 using the nozzle 13, since ammonia does not participate in the denitrification process, there is no need for concentration management, but concentration management can still be performed to confirm that the amount of ammonia is below the processing capacity of the ammonia escape catalyst (ASC) 17c.

[0291] Thus, in this ammonia treatment device and method, in sea areas where the emission limits for marine diesel engines are Tier 3, denitrification can be reliably performed using urea water in the selective reduction catalyst unit 17, thereby meeting the limits, and onboard treatment of ammonia generated on board the ship is also possible. The ammonia water is consumed through harmless treatment, eliminating the need for additional ammonia water supply tanks, thus reducing the capacity of the ammonia water tanks.

[0292] In addition, in the denitrification process using ammonia water generated by a denitrification device, in sea areas where denitrification is not necessarily required under Tier 2 regulations, denitrification can be carried out using ammonia water, thereby providing a clean ship that can discharge clean exhaust gas with reduced nitrogen oxides throughout the entire sea area.

Claims

1. An ammonia treatment device, wherein the ammonia treatment device is installed in a ship carrying liquefied ammonia as fuel for the propulsion machinery of cargo or ship and having a selective reduction catalyst unit, characterized in that: Within the selective reduction catalyst unit, the exhaust gas from the ship's power machinery is supplied with urea water as a reducing agent, and a selective reduction catalyst is configured to denitrify the exhaust gas. The ammonia treatment device includes a purging unit that dissolves liquefied ammonia remaining in the fuel supply line of the ship's power machinery into clean water to generate ammonia water. The ammonia water generated by the removal device is supplied to the selective reduction catalyst unit to treat the ammonia water to render it harmless.

2. The ammonia treatment device according to claim 1, characterized in that: The ammonia supply path for supplying the ammonia solution to the selective reduction catalyst unit arrives at the selective reduction catalyst unit in a manner independent of the urea solution supply path for supplying the urea solution to the selective reduction catalyst unit. The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle. The nozzle is a three-fluid nozzle, comprising: a flow path connected to an air supply source to supply air for diffusing the urea solution and / or the ammonia solution; a flow path connected to the urea solution supply path to spray the urea solution; and a flow path connected to the ammonia solution supply path to spray the ammonia solution. The nozzle is positioned upstream of the selective reduction catalyst unit.

3. The ammonia treatment device according to claim 1, characterized in that: The ammonia supply path for supplying the ammonia solution to the selective reduction catalyst unit arrives at the selective reduction catalyst unit in a manner independent of the urea solution supply path for supplying the urea solution to the selective reduction catalyst unit. The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle. The nozzle includes a first nozzle and a second nozzle. The first nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source to supply air; and a flow path connected to the urea water supply path to spray the urea water. The first nozzle is disposed on the upstream side within the selective reduction catalyst unit. The second nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source for supplying air; and a flow path connected to the ammonia water supply path for spraying the ammonia water. The second nozzle is disposed on the upstream side within the selective reduction catalyst unit.

4. The ammonia treatment device according to claim 1, characterized in that: The ammonia supply path for supplying the ammonia solution to the selective reduction catalyst unit arrives at the selective reduction catalyst unit in a manner independent of the urea solution supply path for supplying the urea solution to the selective reduction catalyst unit. The selective reduction catalyst unit can be simultaneously supplied with urea solution and ammonia solution through a nozzle. The nozzle includes a first nozzle and a second nozzle. The first nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source to supply air; and a flow path connected to the urea water supply path to spray the urea water. The first nozzle is disposed on the upstream side within the selective reduction catalyst unit. The second nozzle is a dual-fluid nozzle, comprising: a flow path connected to the air supply source for supplying air; and a flow path connected to the ammonia water supply path for spraying the ammonia water. The second nozzle is disposed in the exhaust receiver through which the exhaust gas passes before reaching the selective reduction catalyst unit, and supplies the air and the ammonia water into the selective reduction catalyst unit through the exhaust receiver.

5. The ammonia treatment device according to claim 1, characterized in that: The ammonia supply path for supplying the ammonia water to the selective reduction catalyst unit merges with the urea water supply path for supplying the urea water to the selective reduction catalyst unit before reaching the selective reduction catalyst unit. Either the urea solution or the ammonia solution is supplied to the selective reduction catalyst unit through a nozzle. The nozzle is a dual-fluid nozzle, comprising: a flow path connected to an air supply source to supply air; and a flow path connecting the urea water supply path and the ammonia water supply path after they merge, for spraying the urea water or the ammonia water. The nozzle is positioned upstream of the selective reduction catalyst unit.

6. The ammonia treatment apparatus according to any one of claims 1 to 4, characterized in that: The ammonia treatment device has an instrument for measuring the density of the ammonia solution. The selective reduction catalyst unit is simultaneously supplied with the urea solution and the ammonia solution. The density of the ammonia solution, measured by an instrument measuring the density of the ammonia solution, is converted into the concentration of the ammonia solution. Based on this concentration, the molar equivalent of the ammonia solution supplied to the selective reduction catalyst unit is calculated. Based on the known concentration of the urea solution, the molar equivalent of the urea solution supplied to the selective reduction catalyst unit is calculated. The molar equivalents of ammonia and urea supplied to the selective reduction catalyst unit are added together, and the flow rates of the urea and ammonia are adjusted according to the resulting molar equivalents, as part of the denitrification treatment of the waste gas.

7. The ammonia treatment apparatus according to any one of claims 1 to 5, characterized in that: The liquefied ammonia supplied from the ship's fuel supply system merges with an ammonia supply path for supplying the ammonia solution to the selective reduction catalyst unit. The ammonia solution mixes with the liquefied ammonia to form ammonia water, which is then supplied to the selective reduction catalyst unit. The ammonia treatment device includes an instrument for measuring the density of the ammonia solution obtained by mixing the ammonia water and the liquefied ammonia. Based on the density of the ammonia water measured by an instrument measuring the density of the ammonia water, the molar equivalent of the ammonia water supplied to the selective reduction catalyst unit is calculated, and the flow rate of the ammonia water is adjusted according to the calculated molar equivalent to perform denitrification treatment on the waste gas as the harmless treatment.

8. The ammonia treatment apparatus according to any one of claims 1 to 5, characterized in that: The ammonia treatment device is equipped with instruments to measure the concentration of leaked ammonia in the waste gas. The exhaust gas flow rate of the power machinery is measured, and the ammonia leakage amount is calculated based on the measured exhaust gas flow rate and the ammonia leakage concentration, or based on the exhaust gas flow rate and the ammonia leakage concentration calculated according to the output and load information of the power machinery. The flow rate of the urea solution or the ammonia solution is adjusted so that the sum of the amount of ammonia supplied to the selective reduction catalyst unit by the urea solution and / or the ammonia solution and the amount of ammonia leakage becomes the amount of ammonia treated in the selective reduction catalyst unit, and the waste gas is denitrified as the harmless treatment.

9. The ammonia treatment apparatus according to any one of claims 1 to 5, characterized in that: An ammonia slip catalyst is disposed within the selective reduction catalyst unit. The ammonia water supplied to the selective reduction catalyst unit is rendered harmless by the ammonia escape catalyst.

10. An ammonia treatment method, said ammonia treatment method being used to treat ammonia in a ship that carries liquefied ammonia as fuel for the power machinery of a cargo ship or vessel and has a selective reduction catalyst unit, characterized in that: Within the selective reduction catalyst unit, the exhaust gas from the ship's power machinery is supplied with urea water as a reducing agent, and a selective reduction catalyst is provided to denitrify the exhaust gas. Ammonia water is generated by vaporizing liquefied ammonia remaining in the fuel supply line of the ship's power machinery, or by dissolving ammonia volatilized from the cargo in clean water using a pest control device. The ammonia water generated by the removal device is supplied to the selective reduction catalyst unit to treat the ammonia water to render it harmless.

11. The ammonia treatment method according to claim 10, characterized in that: The selective reduction catalyst unit is simultaneously supplied with the urea solution and the ammonia solution. The density of the ammonia solution is measured, and the measured density is converted into an ammonia concentration. Based on this concentration, the molar equivalent of ammonia solution supplied to the selective reduction catalyst unit is calculated. Based on the known concentration of the urea solution, the molar equivalent of the urea solution supplied to the selective reduction catalyst unit is calculated. The molar equivalents of ammonia and urea supplied to the selective reduction catalyst unit are added together, and the flow rates of the urea and ammonia are adjusted according to the resulting molar equivalents, as part of the denitrification treatment of the waste gas.

12. The ammonia treatment method according to claim 10, characterized in that: The liquefied ammonia supplied from the ship's fuel supply system is merged with an ammonia supply path used to supply the ammonia water to the selective reduction catalyst unit, so that the ammonia water and the liquefied ammonia are mixed to generate ammonia water, which is then supplied to the selective reduction catalyst unit. The density of the ammonia solution formed by mixing the ammonia solution and the liquefied ammonia was measured. Based on the measured density of the ammonia water, the molar equivalent of the ammonia water supplied to the selective reduction catalyst unit is calculated, and the flow rate of the ammonia water is adjusted according to the calculated molar equivalent to perform denitrification treatment on the waste gas as the harmless treatment.

13. The ammonia treatment method according to claim 10, characterized in that: Install an instrument to measure the concentration of leaked ammonia in the exhaust gas. The amount of ammonia leakage is calculated based on the measured exhaust gas flow rate and the ammonia leakage concentration, or based on the exhaust gas flow rate and the ammonia leakage concentration calculated according to the output and load information of the power machinery. The flow rate of the urea solution or the ammonia solution is adjusted so that the sum of the amount of ammonia supplied to the selective reduction catalyst unit by the urea solution and / or the ammonia solution and the amount of ammonia leakage becomes the amount of ammonia treated in the selective reduction catalyst unit, and the waste gas is denitrified as the harmless treatment.

14. The ammonia treatment method according to claim 10, characterized in that: An ammonia slip catalyst is provided within the selective reduction catalyst unit. The ammonia water supplied to the selective reduction catalyst unit is rendered harmless by the ammonia escape catalyst.

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