Ammonia vent gas treatment system and vent gas treatment method using the same

Abstract

This document relates to a vent gas treatment system for ammonia-propelled vessels. The proposed vent gas treatment system includes a vent gas treatment facility configured to recover and treat ammonia discharged from an ammonia fuel consumer or an intermediate facility supplying ammonia fuel to the consumer; a wastewater tank for storing ammonia water discharged from the vent gas treatment facility; and gas piping for returning the ammonia gas generated in the tank back to the vent gas treatment facility. This system efficiently addresses not only the discharge of ammonia water but also the problem of ammonia gas in the tank storing the ammonia water.

Description

Technical Field

[0001] The following description relates to a system for efficiently treating ammonia vent gas in an ammonia propulsion ship or a dual fuel engine ship and a vent gas treatment method using the same. Specifically, it relates to an ammonia vent gas treatment system that improves the ammonia gas problem and a vent gas treatment method using the same in the treatment of aqueous ammonia recovered by vent gas treatment equipment for preventing ammonia outflow from an ammonia propulsion ship.

Background Art

[0002] Generally, ships are propelled using a diesel engine that generates driving force using diesel oil, a gas engine that generates driving force using gas such as LNG, a dual fuel engine that generates driving force using a mixture of diesel oil and gas, and the like.

[0003] In recent years, with the strengthening of environmental regulations by IMO, the demand for environmentally friendly and highly efficient engines has been increasing, and research on propulsion systems using various fuels has been actively conducted.

[0004] Ammonia is attracting attention as an environmentally friendly fuel because it does not contain carbon, but it has relatively disadvantageous characteristics in combustion use compared to conventionally used fuels.

[0005] For example, when ammonia is used as a fuel, the combustion reactivity is lower than that of other fuels, so the exhaust gas contains unburned ammonia (ammonia slip). Unburned ammonia is known as one of the toxic substances and can also cause other environmental pollution.

[0006] Various ammonia vent gas treatment systems have been proposed to solve the problem of ammonia being contained in exhaust gases and released, but ammonia vent gas treatment systems that utilize fresh water have the disadvantage of being large in size, which creates an unfavorable environment when installed in ammonia-propelled ships or dual-fuel engine vessels. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] To solve the above-mentioned problems, one aspect of the present invention aims to provide a vent gas treatment system that further improves the ammonia gas problem in the treatment of ammonia water recovered by an ammonia vent gas treatment facility, while using an ammonia vent gas treatment facility to recover and reuse as much ammonia as possible when an ammonia-propelled vessel is stopped.

[0008] As a specific embodiment, the aim is to provide a vent gas treatment system that solves the problem that even if ammonia water is recovered through a vent gas treatment facility, ammonia may evaporate from residual ammonia remaining on the inner wall of the tank storing the recovered ammonia water, potentially releasing ammonia gas exceeding the permissible concentration to the outside.

[0009] Furthermore, in a preferred embodiment, while ammonia gas can be absorbed through water during discharge, the aim is to provide an improved vent gas treatment system that eliminates the problem that ammonia can re-evaporate from the water containing dissolved ammonia, potentially leading to the discharge of ammonia exceeding dangerous concentrations to the outside.

[0010] Furthermore, the present invention aims to provide a control method that automatically detects when the ammonia concentration in the vent gas exceeds a predetermined threshold and reduces the ammonia concentration in the vent gas in different ways depending on whether the fuel supply valve is open or closed.

[0011] Another aspect of the present invention aims to propose a system for efficiently treating ammonia vent gas by utilizing acidic water discharged from fuel demand sites as cleaning water in a vent gas treatment facility that performs ammonia recovery treatment.

[0012] Another aspect of the present invention involves using the system described above to treat ammonia vent gas and efficiently controlling one or more of the amounts and directions in which acidic water is supplied as ammonia washing water, according to the acidity of the treated water.

[0013] The problems that this invention aims to solve are not limited to the technical problems described above, and other technical problems not mentioned can be clearly understood by those skilled in the art in which this invention pertains through the following description. [Means for solving the problem]

[0014] In one aspect of the present invention, which aims to solve the above-mentioned problems, we propose a vent gas treatment system for an ammonia-propelled ship, characterized in that it includes: a vent gas treatment facility configured to recover and treat ammonia discharged from a destination for ammonia fuel or an intermediate facility that supplies ammonia fuel to the destination; a tank for storing ammonia water discharged from the vent gas treatment facility; and a gas piping that returns the ammonia gas generated in the tank to the vent gas treatment facility.

[0015] The system may further include a knockout drum (KOD), and a recovery tank for storing ammonia water discharged from the KOD.

[0016] Furthermore, in another aspect of the present invention for solving the above-mentioned problems, we propose an ammonia vent gas treatment system comprising a first tank for storing acidic water discharged from a fuel demand site, and a vent gas treatment facility configured to recover and treat ammonia discharged from an ammonia fuel supply system that supplies ammonia fuel to the demand site, wherein the vent gas treatment facility is configured to utilize the acidic water stored in the first tank as ammonia washing water. [Effects of the Invention]

[0017] According to the embodiments of the present invention described above, ammonia discharged when an ammonia-propelled vessel is stopped can be recovered and reused as much as possible, and the problem of ammonia gas in the treatment of ammonia water recovered by the vent gas treatment equipment can be further improved.

[0018] Specifically, even if ammonia water is recovered via a vent gas treatment facility, the problem that ammonia may evaporate from residual ammonia remaining on the inner wall of the tank storing the recovered ammonia water, potentially releasing ammonia gas exceeding the permissible concentration into the outside environment, can be efficiently solved.

[0019] Furthermore, by returning the ammonia gas generated in the tank storing the ammonia water discharged from the vent gas treatment facility back to the vent gas treatment facility via gas piping, the problem of ammonia re-evaporating from the water containing dissolved ammonia and potentially releasing ammonia levels exceeding dangerous limits to the outside can be efficiently eliminated.

[0020] Furthermore, the ammonia concentration of the vent gas can be efficiently managed through a gas detector that automatically detects the ammonia concentration of the vent gas, and the ammonia concentration of the vent gas can be efficiently reduced by applying water supply or air blow differently depending on whether the fuel supply valve is open or closed.

[0021] In addition, the acidic water discharged from the fuel demand side can be utilized as the washing water of the vent gas treatment facility that performs ammonia recovery treatment, thereby increasing the treatment efficiency of ammonia vent gas, and if necessary, reducing the size of the vent gas treatment facility.

[0022] Moreover, according to one embodiment of the present invention, ammonia vent gas is treated using the above-described system, and one or more of the amount and the supply direction of supplying the acidic water as ammonia washing water are controlled according to the acidity of the treated water, so that the neutralization of the discharged water can be ensured more safely.

[0023] The acidic water discharged from the fuel demand side can be utilized as the washing water of the vent gas treatment facility that performs ammonia recovery treatment, thereby increasing the treatment efficiency of ammonia vent gas, and if necessary, reducing the size of the vent gas treatment facility.

[0024] Moreover, according to one embodiment of the present invention, ammonia vent gas is treated using the above-described system, and one or more of the amount and the supply direction of supplying the acidic water as ammonia washing water are controlled according to the acidity of the treated water, so that the neutralization of the discharged water can be ensured more safely.

[0025] The effects obtained by the present invention are not limited to the above-described effects, and other effects not mentioned can also be clearly understood by those skilled in the art in the technical field to which the present invention pertains from the following description.

Brief Description of the Drawings

[0026] [Figure 1] FIG. 1 is a diagram for explaining an ammonia propulsion ship vent gas treatment system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram for explaining a configuration for recovering and reusing ammonia according to an embodiment of the present invention. [Figure 3] FIG. 3 is a diagram for intensively explaining a structure that utilizes a knockout drum as a vent gas treatment facility according to an embodiment of the present invention. [Figure 4] Figure 4 is a diagram illustrating a structure in which a scrubber and an absorption tank are used as a vent gas treatment facility according to one embodiment of the present invention. [Figure 5] Figure 5 is a diagram illustrating a control method using a gas detector according to one embodiment of the present invention. [Figure 6] Figures 6 and 7 are diagrams illustrating the operation of the fuel supply valve in its open and closed states, respectively. [Figure 7] Figures 6 and 7 are diagrams illustrating the operation of the fuel supply valve in its open and closed states, respectively. [Figure 8] Figure 8 is a diagram illustrating the basic configuration of an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 9] Figure 9 illustrates the advantages of using an acidic water scrubber as an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 10] Figure 10 illustrates a method for treating vent gas in a propulsion vessel that utilizes ammonia, using an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 11] Figures 11 to 14 illustrate a configuration for controlling the amount and direction of supply of washing water, etc., as an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 12] Figures 11 to 14 illustrate a configuration for controlling the amount and direction of supply of washing water, etc., as an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 13] Figures 11 to 14 illustrate a configuration for controlling the amount and direction of supply of washing water, etc., as an ammonia vent gas treatment system according to another embodiment of the present invention. [Figure 14] Figures 11 to 14 illustrate a configuration for controlling the amount and direction of supply of washing water, etc., as an ammonia vent gas treatment system according to another embodiment of the present invention. [Modes for carrying out the invention]

[0027] In one aspect of the present invention, which aims to solve the above-mentioned problems, we propose a vent gas treatment system for an ammonia-propelled ship, characterized in that it includes: a vent gas treatment facility configured to recover and treat ammonia discharged from a destination for ammonia fuel or an intermediate facility that supplies ammonia fuel to the destination; a tank for storing ammonia water discharged from the vent gas treatment facility; and a gas piping that returns the ammonia gas generated in the tank to the vent gas treatment facility.

[0028] The vent gas treatment equipment may include a knockout drum (KOD), and the tank may include a recovery tank for storing ammonia water discharged from the KOD.

[0029] On the other hand, the vent gas treatment equipment may further include one or more of the following: a scrubber that injects an absorbent into the vent gas discharged from the KOD to absorb ammonia; and an absorption tank that stores the absorbent and absorbs ammonia from the vent gas that is directly injected into the stored absorbent.

[0030] In this case, it is preferable that the tank further includes a wastewater tank for recovering and storing ammonia-contaminated water generated in the absorption tank.

[0031] Furthermore, a gas detector for detecting the ammonia gas concentration of the vent gas may be further included on the piping through which the vent gas is discharged.

[0032] In the above-described embodiment, it is preferable that the ammonia propulsion vessel includes a fuel storage unit for storing ammonia, a fuel supply unit for receiving ammonia from the fuel storage unit and supplying ammonia to the customer, and a fuel supply valve provided between the fuel supply unit and the customer for shutting off the supply of ammonia.

[0033] The aforementioned intermediate configuration may correspond to the fuel supply valve, but is not limited thereto. It may also be a new configuration not described in the paragraph above, or a configuration suitable for discharging ammonia between the customer and the fuel supply device.

[0034] On the other hand, if the ammonia gas concentration of the vent gas discharged from the vent gas treatment equipment is above a predetermined level, it is preferable to supply water or provide air blow depending on whether the fuel supply valve is open or closed, thereby adjusting the ammonia gas concentration of the vent gas to below the predetermined level.

[0035] Specifically, when the fuel supply valve is open, it is preferable to adjust the ammonia gas concentration of the vent gas to a predetermined level or lower by supplying water, and conversely, when the fuel supply valve is closed, it is preferable to adjust the ammonia gas concentration of the vent gas to a predetermined level or lower by blowing air.

[0036] Furthermore, in another aspect of the present invention for solving the above-mentioned problems, we propose an ammonia vent gas treatment system comprising a first tank for storing acidic water discharged from a fuel demand site, and a vent gas treatment facility configured to recover and treat ammonia discharged from an ammonia fuel supply system that supplies ammonia fuel to the demand site, wherein the vent gas treatment facility is configured to utilize the acidic water stored in the first tank as ammonia washing water.

[0037] The vent gas treatment facility may further include a second tank for storing the wastewater neutralized using the washing water.

[0038] The system may further include a first scrubber for treating acidic gases discharged from the aforementioned customer, and the acidic water may be discharged from the first scrubber and stored in the first tank.

[0039] The vent gas treatment equipment may include a second scrubber configured to utilize the acidic water stored in the first tank as ammonia washing water.

[0040] In this case, the first scrubber and the second scrubber can be defined as corresponding to acidic water scrubbers.

[0041] The aforementioned acidic water scrubber may be smaller in size than the clean water scrubber, but is not limited to this size. The acidic water scrubber can also be the same size as the clean water scrubber, but can be used to improve ammonia treatment performance.

[0042] The system may further include a pump for supplying the acidic water stored in the first tank to the vent gas treatment equipment.

[0043] In one embodiment, the present invention may further include a first pH meter for measuring the acidity of the acidic water stored in the first tank, and a first valve configured to control the opening of a pipe supplying the acidic water stored in the first tank to the vent gas treatment equipment according to the acidity measured by the first pH meter.

[0044] In other embodiments, the system may further include a second pH meter for measuring the acidity of the treated water in the vent gas treatment facility, and a second valve configured to control the opening of a pipe supplying the acidic water stored in the first tank to the vent gas treatment facility according to the acidity measured by the second pH meter.

[0045] In yet another embodiment, the system may further include a third pH meter for measuring the acidity of the wastewater treated by the vent gas treatment equipment, and a third valve configured to mix the acidic water stored in the first tank with the wastewater treated by the vent gas treatment equipment for neutralization treatment, according to the acidity measured by the third pH meter.

[0046] In this case, the system may further include a third tank for storing the acidic water stored in the first tank and the wastewater treated by the vent gas treatment equipment so that they are mixed and neutralized.

[0047] In the above description, the target market can include ammonia engines or dual-fuel engines.

[0048] On the other hand, in another aspect of the present invention for solving the above problems, a vent gas treatment method is proposed for a propulsion vessel that utilizes ammonia, which includes storing acidic water discharged from a fuel demand site in a first tank, and recovering ammonia discharged from an ammonia fuel supply system that supplies ammonia fuel to the demand site through a vent gas treatment facility, wherein the recovery of ammonia through the vent gas treatment facility includes using the acidic water stored in the first tank as ammonia washing water.

[0049] Preferably, one or more of the amounts and directions in which the acidic water is supplied as the ammonia washing water can be controlled according to the acidity of the treated water.

[0050] Specifically, this may further include measuring the acidity of the acidic water stored in the first tank and controlling the opening of the piping that supplies the acidic water stored in the first tank to the vent gas treatment equipment according to the measured acidity.

[0051] As another example, the system may further include measuring the acidity of the treated water in the vent gas treatment facility and controlling the opening of the piping that supplies the acidic water stored in the first tank to the vent gas treatment facility according to the measured acidity.

[0052] As yet another example, the acidity of the wastewater treated by the vent gas treatment equipment may be measured, and the acidic water stored in the first tank may be mixed with the wastewater treated by the vent gas treatment equipment according to the measured acidity to neutralize it.

[0053] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. However, the present invention can be embodied in a variety of different forms and is not limited to the embodiments described herein. In addition, parts unrelated to the description have been omitted in the drawings in order to clearly illustrate the present invention, and similar parts have been denoted by similar reference numerals throughout the specification.

[0054] Where the specification as a whole states that a certain part "includes" a certain component, this means that, unless otherwise stated, it may include other components rather than excluding them.

[0055] Figure 1 is a diagram illustrating a vent gas treatment system for an ammonia-propelled vessel according to one embodiment of the present invention.

[0056] In the example shown in Figure 1, the ammonia propulsion vessel 1 may include a fuel storage unit 10 for storing ammonia, a fuel supply unit 20 that receives ammonia from the fuel storage unit 10 and supplies ammonia to ammonia fuel demand destinations 40, and a fuel supply valve 30 provided between the fuel supply unit 20 and the demand destinations 40, which can shut off the supply of ammonia.

[0057] The fuel storage unit 10 is a facility capable of storing ammonia and may include any form of facility, and the fuel storage unit 10 may be a storage facility in the form of a tank.

[0058] In this specification, the term "ship" is assumed to encompass not only merchant vessels that transport cargo from a point of origin to a destination, but also offshore structures that float at a specific point in the sea and perform particular tasks.

[0059] The fuel supply unit 20 is connected to one or more fuel storage units 10 and can heat ammonia to a temperature suitable for supply to the customer 40 and pressurize the ammonia to a pressure suitable for supply to the customer 40. For example, it can supply ammonia with a pressure of 50 to 300 bar and a temperature of 10 to 50 degrees to the customer 40. The fuel supply unit 20 may also be an LFSS (Low-flashpoint Fuel Supply System).

[0060] The fuel supply valve 30 is located between the fuel supply unit 20 and the customer 40. If the fuel supply unit 20 malfunctions in the fuel supply line L1, the fuel supply valve 30 can be separated from the customer 40, effectively shutting off the fuel supply to the customer 40. The fuel supply valve 30 may consist of valves and filters for purposes such as double shutoff and discharge, venting, pressure adjustment, and nitrogen supply, as well as various sensors. The fuel supply valve 30 is a mechanism in which control valves that control the supply of ammonia to the customer 40 are centrally located, and may be a fuel valve train (FVT).

[0061] The customer (40) may be an ammonia propulsion engine or an ammonia power generation engine. The customer (40) can use ammonia to propel a ship or generate electricity for use on the ship.

[0062] On the other hand, the example in Figure 1 further shows a fuel recovery line L2. The fuel recovery line L2 connects the demand destination 40 to a recovery tank (not shown, described later in Figure 2 and below) located at the fuel supply unit 20, and excess ammonia that remains unburned at the demand destination 40 is transferred to the recovery tank (not shown) via the fuel recovery line L2. Such excess ammonia can have a pressure of 50 to 300 bar.

[0063] On the other hand, the ammonia-propelled vessel 1 according to this embodiment further includes a vent gas treatment system to prevent ammonia leakage, and the vent gas treatment system according to this embodiment is characterized by including a vent gas treatment facility C configured to recover and treat ammonia discharged from an ammonia fuel demand destination 40 or an intermediate configuration that provides ammonia fuel to the demand destination 40, a tank T for storing ammonia water discharged from the vent gas treatment facility C, and a gas piping R that returns the ammonia gas generated in the tank T to the vent gas treatment facility C.

[0064] The vent gas treatment equipment C is configured to recover and reuse as much ammonia as possible that is discharged when the ammonia-propelled vessel 1 is stopped, and may include a combination of a knockout drum (KOD) and / or a scrubber and an absorption tank, as described later.

[0065] Furthermore, depending on the type of vent gas treatment equipment C, the concept is that tank T can include recovery tanks, wastewater tanks, etc.

[0066] In this embodiment, we propose to further improve the ammonia gas problem in the treatment of ammonia water by further including a gas piping R that returns the ammonia gas generated in the tank T that stores the ammonia water discharged from the vent gas treatment facility C back to the vent gas treatment facility C.

[0067] Specifically, even if ammonia water is recovered via the vent gas treatment facility C, residual ammonia remaining on the inner wall of the tank T storing the recovered ammonia water may evaporate, potentially releasing ammonia gas exceeding the permissible concentration to the outside. However, in this embodiment, as described above, this problem can be efficiently solved by further including a gas pipe R that returns the ammonia gas generated in tank T back to the vent gas treatment facility C.

[0068] Figure 2 is a diagram illustrating a configuration for recovering and reusing ammonia according to one embodiment of the present invention.

[0069] Figure 2, in comparison with Figure 1, shows that the fuel supply unit 20 includes a heater 21, a pump 22, a return cooler 23, and a recovery tank 24. In addition to the configuration shown in Figure 2, the fuel supply unit 20 may include various valves and sensors for pressure regulation, flow rate regulation, venting, and nitrogen supply, and may also include a service tank, nitrogen supply system, glycol system, gas-liquid separator, and vent mast.

[0070] The recovery tank 24 can separate the excess ammonia recovered at the demand destination 40 into liquid ammonia LA and gaseous ammonia GA. The liquid ammonia LA separated by the recovery tank 24 can be recovered into the fuel recovery line L2. The fuel recovery line L2 may be provided with a return cooler 23 for cooling the liquid ammonia LA.

[0071] Liquid ammonia LA may be transferred to the fuel recovery line L2 via a recovery tank line L3 that connects the recovery tank 24 and the fuel recovery line L2.

[0072] Although not shown in the drawings, a line may be provided to connect the recovery tank 24 and the fuel storage unit 10, and ammonia can be transferred from the recovery tank 24 to the fuel storage unit 10 using this line.

[0073] In this way, excess ammonia that remains unburned at the demand destination 40 can be recovered, and the liquid ammonia LA separated by the recovery tank 24 can be resupplied to the fuel recovery line L2.

[0074] On the other hand, the gaseous ammonia GA separated by the recovery tank 24 may be transferred to the treatment device 50 via the vent line L4. The treatment device 50 can reduce the concentration of gaseous ammonia GA. The vent gas discharged from the treatment device 50 can be discharged to the outside via a vent mast (not shown).

[0075] The exhaust gas emitted from the customer 40 can be transferred along the exhaust gas line L5 to the nitrogen oxide reduction device 60. The nitrogen oxide reduction device 60 receives liquid ammonia LA or gaseous ammonia GA from the fuel storage unit 10, and uses the transferred ammonia as a reducing agent to reduce nitrogen oxides (NOx) and remove nitrogen oxides contained in the exhaust gas. Such a nitrogen oxide reduction device 60 may be a selective catalytic reduction (SCR).

[0076] In the ammonia-propelled vessel 2, ammonia stored in the fuel storage section 10 can be used for nitrogen oxide removal, which has the advantage of eliminating the need for a separate ammonia generator or an aqueous ammonia solution such as urea for the nitrogen oxide reduction device 60.

[0077] In the embodiment described above in relation to Figure 2, the treatment apparatus 50 is a device for treating gaseous ammonia GA from the recovery tank 24, and can be considered a type of vent gas treatment equipment C in the embodiment of Figure 1. Furthermore, the recovery tank 24 can also be considered an example of tank T in the embodiment of Figure 1, and the vent line L4 in Figure 2 can also be considered an example of gas piping R for returning ammonia gas in the embodiment of Figure 1.

[0078] However, in the embodiment of Figure 1, tank T refers to a tank T that stores ammonia water discharged from the fire prevention equipment C, but in the embodiment of Figure 2, the recovery tank 24 does not store ammonia water discharged from the treatment device 50, so the embodiment of Figure 2 can be distinguished from tank T and gas piping R in the narrow sense.

[0079] Figure 2 conceptually shows the possibility of applying an additional configuration to the treatment device 50, which serves as a vent gas treatment facility, to solve the ammonia gas concentration problem described above in relation to Figure 1. The specific structure of this configuration will be described in detail using Figures 3 and 4 below.

[0080] Figure 3 is a diagram illustrating in detail the structure of a vent gas treatment facility that utilizes a knockout drum according to one embodiment of the present invention.

[0081] In the following, we will omit explanations of parts that are common with Figure 2. In the following, the processing apparatus 51 may be in a form in which a scrubber (not shown) and an absorption tank (not shown), which will be described later in relation to Figure 4, are integrated, but in the example of Figure 3, we will omit the explanation.

[0082] Referring to Figure 3, the ammonia propulsion vessel 3 according to this embodiment shows an example in which a knockout drum (KOD:C1) is included as an example of the vent gas treatment equipment C in the embodiment of Figure 1. Furthermore, unlike the recovery tank 24 described in the embodiment of Figure 2, the recovery tank T1 is referred to using a different reference numeral in the drawings than the recovery tank 24 in Figure 2, as it is a tank that stores ammonia water discharged from the KOD(C1), which corresponds to an example of the vent gas treatment equipment C, via the 20th line L20.

[0083] In this embodiment, the ammonia gas generated in the recovery tank T1, which stores the ammonia water discharged from KOD(C1), can be returned to the recovery tank T1 via the gas piping R1, indicated as the 10th line L10.

[0084] This configuration explains the operation of the ammonia-propelled vessel 3.

[0085] Similar to the embodiment in Figure 2, the ammonia fuel is supplied from the fuel storage unit 10 to the demand destination 40, discharged from the demand destination 40, transferred to the fuel supply line L1 via the fuel recovery line L2, and transferred to the recovery tank T1 along the 30th line L30. Furthermore, the recovered ammonia water can be transferred to KOD(C1) along the 50th line L50.

[0086] In other words, similar to the recovery tank 24 in Figure 2, the recovery tank T1 according to this embodiment can also receive ammonia from the fuel recovery line L2 when the customer 40 stops, pressurize the ammonia, and supply it again to the fuel supply line L1.

[0087] When the customer 40 stops, KOD(C1) is supplied with ammonia fuel from the fuel supply valve 30 or the recovery tank T1. The gaseous ammonia is transferred to the treatment device 51, and the liquid ammonia is transferred back to the recovery tank T1. In other words, unlike the recovery tank 24 in Figure 2, the recovery tank T1 according to this embodiment additionally performs the function of a tank for storing ammonia water discharged from KOD(C1), which is an example of the vent gas treatment equipment C.

[0088] In this situation, even if ammonia water is recovered to the recovery tank T1 via KOD(C1), there is a risk that ammonia may evaporate from the residual ammonia remaining on the inner wall of the recovery tank T1 where the recovered ammonia water is stored, potentially releasing ammonia gas exceeding the permissible concentration to the outside. Therefore, in this embodiment, it is proposed to use the 10th line L10 as an ammonia gas return pipe R1 to return the ammonia gas back to KOD(C1), and for this purpose, the gas return pipe R1 can be controlled by the 20th valve V20.

[0089] The 10th line L10 and the 50th line L50 can be integrated into a single pipe and connected to KOD(C1). For example, the 10th line L10 and the 50th line L50 can be integrated into an inlet pipe P1 and connected to KOD(C1). For example, the ammonia discharged from the fuel supply valve 30 and the ammonia gas discharged from the recovery tank T1 can be integrated into a single inlet pipe P1 and connected to KOD(C1).

[0090] Ammonia can be separated into gas and liquid by moving from one side to the other within the KOD(C1). To improve the gas-liquid separation performance of the KOD(C1), the position and number of inlet sections S1 formed at the end of the inlet pipe P1 can be limited. For example, it is preferable that the inlet section S1 of the inlet pipe P1 be formed as a single unit. For example, it is preferable that the inlet section S1 of the inlet pipe P1 be formed at a predetermined distance from the discharge section S2 of the outlet pipe P2.

[0091] By supplying ammonia to KOD(C1) through the inlet S1 of the inlet piping P1, which is formed at a predetermined distance and has a single structure, sufficient distance and space can be secured for the separation of gas and liquid within KOD(C1). By securing sufficient distance and space, the separation performance of KOD(C1) can be improved.

[0092] The gaseous ammonia separated in KOD(C1) can be sent to the treatment device 51 for further processing, while the separated liquid ammonia can be reused as fuel on board the ship.

[0093] On the other hand, the inert gas supply unit 80 can supply inert gas to the recovery tank T1 or KOD(C1). The inert gas supply unit 80 is configured to supply inert gas such as nitrogen gas N2 or carbon dioxide gas CO2, and may include a device that generates inert gas or a device that stores inert gas. The inert gas supply unit 80 can supply inert gas to the recovery tank T1 or KOD(C1) so that ammonia does not come into contact with oxygen in the recovery tank T1 or KOD(C1). The inert gas is supplied to the recovery tank T1, and the pressure in the recovery tank T1 can be increased.

[0094] Figure 4 is a diagram illustrating a structure in which a scrubber and an absorption tank are used as a vent gas treatment facility according to one embodiment of the present invention.

[0095] The ammonia propulsion vessel 4 shown in Figure 4 basically includes all the structures shown in Figure 3, but the upper right part further includes an additional vent gas treatment facility C2, which is a scrubber (C2-1) that injects an absorbent into the vent gas discharged from KOD (C1) to absorb ammonia, and an absorption tank C2-2 that stores the absorbent and absorbs ammonia from the vent gas directly introduced into the stored absorbent.

[0096] Scrubber C2-1 is a device that sprays water, absorbent materials, etc., into the contaminated gas taken into Scrubber C2-1, so that the contaminants are absorbed by the water, etc., and removed. The vent gas from which contaminants have been removed via Scrubber C2-1 can be released into the atmosphere.

[0097] Specifically, the scrubber C2-1 may include a packing section. By spraying water or the like from the top of the scrubber C2-1 and injecting ammonia gas into the bottom of the scrubber C2-1, the water and ammonia gas come into contact at the packing section, causing the ammonia gas to be absorbed by the water. This allows the vented gas from which the ammonia gas has been removed to be discharged to the outside from the top of the scrubber C2-1, and the ammonia water collected at the bottom of the scrubber C2-1 to be discharged to the outside of the scrubber C2-1.

[0098] In the embodiment shown in Figure 4, a structure is illustrated in which the scrubber C2-1 and the absorption tank C2-2 described above are combined as a vent gas treatment facility. However, the present invention is not limited to this, and the scrubber C2-1 can independently perform the role of a vent gas treatment facility C2, and the ammonia water discharged from the scrubber C2-1 can be collected in the wastewater tank T2.

[0099] However, in the embodiment shown in Figure 4, we propose an example in which the absorption tank C2-2 is connected to the lower end of the scrubber C2-1 and operated in order to further improve the vent gas treatment performance.

[0100] Absorption tank C2-2 is a storage facility that stores water, absorbent materials, etc., at a certain water level or higher. Ammonia gas can be directly injected into the water stored in absorption tank C2-2, and the ammonia can be absorbed into the water stored in absorption tank C2-2.

[0101] Scrubber C2-1 has a relatively low concentration of ammonia water discharged from it when water is continuously supplied, and it can supply ammonia at a lower pressure compared to directly supplying ammonia gas in water. However, a continuous water supply is required, and if the flow rate increases significantly, it may become difficult to treat the ammonia gas.

[0102] In contrast, the absorption tank C2-2 has a simple structure in that it supplies ammonia water to the stored water, does not use electricity, and can process ammonia gas even when the flow rate increases, such as when ammonia needs to be discharged urgently. However, the absorption capacity of the absorption tank C2-2 may decrease as the amount of ammonia dissolved in the stored water increases, and because ammonia gas is injected directly into the water, ammonia must be supplied at high pressure when the water level in the stored water rises.

[0103] Therefore, in this embodiment, we propose using both a scrubber C2-1 and an absorption tank C2-2. The scrubber C2-1 can be used when the demand destination 40 is shut down normally, and the absorption tank C2-2 can be used to process a large amount of ammonia gas when the demand destination 40 is shut down urgently. In this case, it is necessary to supply water to each device for efficient absorption of ammonia gas, and it is preferable to process the ammonia water generated in each device separately.

[0104] When the combination of scrubber C2-1 and absorption tank C2-2 is connected via KOD(C1) and used as vent gas treatment equipment C2, the ammonia vent gas treatment effect can be maximized.

[0105] Within the vent gas treatment facility C2, ammonia can be dissolved in water. For example, the water used to dilute the ammonia may be, but not limited to, seawater, fresh water, or acidic water. In other examples, within the vent gas treatment facility C2, ammonia may be treated with a neutralizing agent.

[0106] As shown in Figure 4, the lower end of the vent gas treatment facility C2, specifically the lower end of the absorption tank C2-2, may further include a wastewater tank T2 for recovering and storing ammonia-contaminated water generated in the absorption tank C2-2.

[0107] When the volume, concentration, pH, etc. of the ammonia-contaminated water in absorption tank C2-2 reach a certain level or higher, the ammonia-contaminated water can be supplied to wastewater tank T2. When the ammonia-contaminated water is supplied to wastewater tank T2, the ammonia gas in wastewater tank T2 can be returned to the vent gas treatment facility C2 via gas piping R2 in order to ensure space within wastewater tank T2.

[0108] Once the ammonia recovery step is performed at the ammonia fuel demand site 40, the ammonia may be recovered in the vent gas treatment facility C2. When the recovery of ammonia from the ammonia fuel demand site 40 to the vent gas treatment facility C2 is complete, the ammonia-contaminated water in the vent gas treatment facility C2 may be supplied to the wastewater tank T2. When the ammonia-contaminated water is supplied to the wastewater tank T2, the ammonia gas in the wastewater tank T2 may be returned to the vent gas treatment facility C2 via the gas piping R2 in order to make space in the wastewater tank T2.

[0109] Furthermore, the ammonia gas generated in wastewater tank T2, which stores the ammonia water discharged from absorption tank C2-2, is returned to absorption tank C2-2 or scrubber C2-1 via gas piping R2. This efficiently eliminates the problem of ammonia re-evaporating from the water containing dissolved ammonia, resulting in residual ammonia levels exceeding dangerous concentrations.

[0110] The gas piping R2 may be connected between the scrubber C2-1 and the absorption tank C2-2. For example, the ammonia gas returned via the gas piping R2 may be supplied to a portion S3 between the scrubber C2-1 and the absorption tank C2-2. Connecting the gas piping R2 between the scrubber C2-1 and the absorption tank C2-2 increases the efficiency of ammonia reduction and minimizes the back pressure of the gas discharged from the wastewater tank T2.

[0111] For example, absorption tank C2-2 can generate a back pressure of approximately 0.1 barg, and scrubber C2-1 can generate a back pressure of approximately 0.01 barg. In some cases, it may be more effective to discharge the exhaust gas, which is discharged via gas piping R2, into a portion S3 between scrubber C2-1 and absorption tank C2-2 rather than into absorption tank C2-2.

[0112] Preferably, the gas piping R2 is connected between the scrubber C2-1 and the absorption tank C2-2, and may be connected above the maximum acceptable water level in the absorption tank C2-2.

[0113] On the other hand, as shown in Figure 4, in a preferred embodiment of the present invention, it is proposed to further include a gas detector GD on the piping VENT from which the vent gas is discharged for detecting the ammonia gas concentration of the vent gas. The gas detector GD may be a means for measuring pH. This makes it possible to further detect the threat of hazardous gases with high ammonia gas concentrations being discharged to the outside.

[0114] Specifically, if the ammonia gas concentration of the vent gas discharged from the vent gas treatment facility C2 is above a predetermined level T1, in this embodiment, water (clean water FW) or air blow (Air Blower) can be supplied depending on whether the fuel supply valve 30 is open or closed to adjust the ammonia gas concentration of the vent gas to below the predetermined level T1.

[0115] Figure 5 is a diagram illustrating a control method using a gas detector according to one embodiment of the present invention.

[0116] As shown in Figure 5, according to this embodiment, it is possible to first determine whether the ammonia concentration detected via the gas detector GD is above a predetermined level T1 (S510). In Figure 5, this is shown as determining the ammonia concentration, but this can also be applied as a method that simply determines it according to the pH level.

[0117] If the ammonia concentration detected via the gas detector GD is at or above a predetermined level T1, it is possible to determine whether or not the fuel supply valve 30, for example, FVT, has been opened (S520).

[0118] If the FVT is open, the ammonia gas concentration of the vent gas can be adjusted to a predetermined level T1 or lower through the supply of fresh water (S530). Conversely, if the FVT is closed, the ammonia gas concentration of the vent gas can be adjusted to a predetermined level T1 or lower through air blowing (S540).

[0119] Figures 6 and 7 are diagrams illustrating the operation of the fuel supply valve in its open and closed states, respectively.

[0120] Specifically, Figure 6 shows the process of venting, illustrating an example of operation when the fuel supply valve 30 is open, and Figure 7 shows the process of ammonia water recovery, illustrating an example of operation when the fuel supply valve 30 is closed.

[0121] First, referring to Figure 6, FVT30 may be opened and venting may begin. At this time, the valves for recovering ammonia water and ammonia gas from KOD(C1) are open, and the evaporated gas from KOD(C1) may be supplied to the absorption tank T1 for primary treatment.

[0122] In this manner, when the gas detector GD detects ammonia gas at a dangerous concentration or higher with FVT30 open, it is preferable to supply clean water FW to scrubber C2-1 to reduce the ammonia gas concentration. During the venting process, it can be seen that the clean water supply described above can be utilized in scrubber C2-1 and / or absorption tank C2-2.

[0123] On the other hand, Figure 7 shows the process of ammonia water recovery operation being performed with KVT30 closed. In this case, the ammonia water in absorption tank C2-2 is discharged to wastewater tank T2, and this can be considered a process of emptying absorption tank C2-2.

[0124] Therefore, if the gas detector GD detects a high ammonia concentration during such operation, it is preferable to reduce the ammonia gas concentration by injecting air using an air blow rather than injecting clean water, unlike when the FVT is open.

[0125] The following describes an ammonia vent gas treatment system according to another embodiment of the present invention.

[0126] Figure 8 is a diagram illustrating the basic configuration of an ammonia vent gas treatment system according to another embodiment of the present invention.

[0127] The ammonia-powered vessel 5 refers to a vessel that is driven by power generated from the consumption of ammonia at the ammonia fuel demand destination 110, and for this purpose the ammonia fuel supply system 130 can supply ammonia to the demand destination 110.

[0128] The ammonia fuel supply system 130 is connected to one or more fuel storage units (not shown) and can heat ammonia to a temperature suitable for supply to the demand destination 110 and pressurize the ammonia to a pressure suitable for supply to the demand destination 110. For example, it can supply ammonia having a pressure of 50 to 300 bar and a temperature of 10 to 50 degrees to the demand destination 110. The ammonia fuel supply system 130 may also be an LFSS (Low-flashpoint Fuel Supply System).

[0129] In this specification, the term "vessel" includes not only the ammonia-propelled vessel 5 described above, but also vessels utilizing a dual-fuel engine, in which case it may include a diesel fuel supply system 120 that supplies diesel fuel to the customer 110.

[0130] In this specification, the term "fuel consumer 110" does not need to be interpreted as being limited to the ammonia fuel consumer, diesel fuel consumer, etc., as long as it plays a basic role in discharging acidic water.

[0131] As described above, the customer 110 uses ammonia / diesel fuel to obtain driving force, which can result in the emission of acidic gases including NOx, SOx, and CO2. In this embodiment, a first scrubber 140 can be used to treat such acidic gases. The first scrubber 140 can be configured to receive clean water as input, as shown in Figure 8, thereby drawing acidic gases into the water, and storing the acidic water containing the drawn-in acidic gases in a first tank 150.

[0132] On the other hand, in an ammonia-propelled vessel 5 or a dual-fuel engine, the ammonia fuel supply system 130 will discharge ammonia gas, and in this embodiment, it is proposed to use a vent gas treatment facility 160 to recover and treat the ammonia from such ammonia gas.

[0133] The vent gas treatment equipment 160 can have the configuration of a second scrubber 160 as shown in Figure 8, but is not limited to this configuration. Various configurations that enable the recovery and treatment of ammonia gas using wash water can be utilized.

[0134] The vent gas treatment equipment 160 according to this embodiment is characterized by utilizing acidic water stored in the first tank 150 as washing water, rather than using clean water as in the first scrubber 140, to increase ammonia recovery efficiency and reduce the size of the vent gas treatment equipment 160 as needed. The principle of ensuring increased ammonia recovery efficiency and size reduction by utilizing acidic water as washing water will be described in detail below in Figure 9.

[0135] On the other hand, the vent gas treatment equipment 160 can store the wastewater, which has been neutralized using washing water, in the second tank 170 and then discharge it.

[0136] Figure 9 illustrates the advantages of using an acidic water scrubber as an ammonia vent gas treatment system according to another embodiment of the present invention.

[0137] When carbon dioxide dissolves in water, it forms carbonic acid (HCO3-), producing acidic water. Similarly, NOx and SOx also form acidic water. On the other hand, when ammonia dissolves in water, it forms ammonium (NH4+), producing alkaline water. Ammonia's solubility increases as the initial pH of the water decreases.

[0138] Therefore, by dissolving carbon dioxide in the exhaust gas in a scrubber to produce acidic water and supplying it as cleaning water for the ammonia scrubber, it is possible to improve the performance of the scrubber. In this embodiment, such a scrubber can be conceptualized as an acidic water scrubber 220, in particular in contrast to the clean water scrubber 210.

[0139] Tables 1 and 2 below show the simulation results for comparing the performance of the clean water scrubber 210 and the acidic water scrubber 220, respectively.

[0140] [Table 1]

[0141] [Table 2]

[0142] As can be seen from Tables 1 and 2 above, when acidic water is supplied as washing water under the same washing water supply conditions (flow rate of 370 kg / h), it can be confirmed that the ammonia emission concentration is significantly reduced.

[0143] This indicates that when using acidic water as the cleaning water, it is possible to achieve performance equivalent to that of a clean water-based scrubber, even with a small flow rate / size scrubber.

[0144] Furthermore, this reaction has the advantage of being able to neutralize wastewater by converting ammonium in aqueous ammonia to ammonium carbonate.

[0145] In Figure 9, the acidic water scrubber 220 can be constructed by combining the first scrubber 140 and the second scrubber 160 shown in Figure 8. By utilizing acidic water as the washing water, the size of the second scrubber 160 can be designed to be smaller than that of a normal clean water scrubber 210, as needed.

[0146] On the other hand, the acidic water scrubber 230 may be applied as a second scrubber 160, separate from the first scrubber 140. In Figure 9, the washing water (WATERC) input to the acidic water scrubber 230 is distinguished from the washing water (WATER) of the clean water scrubber 210 in that acidic washing water is used. Similarly, the exhaust gas (LEANGASC) and wastewater (RICHSOLC) of the acidic water scrubber 220 are distinguished from the exhaust gas (LEANGAS) and wastewater (RICHSOL) of the clean water scrubber 210. As confirmed in Tables 1 and 2 above, when used for ammonia washing, the ammonia concentration of the exhaust gas (LEANGASC) of the acidic water scrubber 230 can be significantly lower than the ammonia concentration of the exhaust gas (LEANGAS) of the clean water scrubber 210.

[0147] In other words, in the notation in Figure 9, "C" is used to distinguish the wash water, mixed gas, exhaust gas, and discharged water input / output to the acidic water scrubber 220 from the wash water, mixed gas, exhaust gas, and discharged water input / output to the clean water scrubber 230. However, depending on the application, it does not necessarily mean acidic, and the discharged water from the acidic water scrubber 220 used for ammonia washing may be discharged water that has been neutralized through the neutralization of the acidic wash water and ammonia.

[0148] Figure 10 illustrates a method for treating vent gas in a propulsion vessel that utilizes ammonia, using an ammonia vent gas treatment system according to another embodiment of the present invention.

[0149] As described above, this embodiment includes storing acidic water discharged from the fuel customer in a first tank (S310), and recovering ammonia discharged from the ammonia fuel supply system that supplies ammonia fuel to the customer through a vent gas treatment facility (S320), wherein the recovery of ammonia through the vent gas treatment facility includes using the acidic water stored in the first tank as ammonia washing water. As a result, as described above in relation to Figure 9, ammonia recovery performance can be improved, or the size of the ammonia vent gas treatment facility can be reduced.

[0150] On the other hand, in a preferred embodiment of the present invention, it is proposed to control one or more of the amounts and directions in which the acidic water supplied as ammonia washing water is supplied according to the acidity of the treated water (S330). This can be implemented based on the acidity of the first tank (S330-1), the acidity within the vent gas treatment facility (S330-2), the acidity of the discharge water from the vent gas treatment facility (S330-3), or a combination thereof, and each of these will be described in detail below.

[0151] Figures 11 to 14 are diagrams illustrating the configuration for controlling the amount and direction of washing water supply according to an embodiment of the present invention.

[0152] First, Figure 11 shows a structure in the configuration of Figure 8 that further includes a pump 310 for supplying acidic water stored in the first tank 150 to the vent gas treatment equipment 160. By utilizing the pump 310, flexibility can be ensured in the arrangement of the first tank 150 and the vent gas treatment equipment 160, and in some cases, the operation of the pump 310 can be controlled to control the amount of acidic water flowing into the vent gas treatment equipment 160.

[0153] Figure 12 proposes a structure that, in addition to the configuration of Figure 11, includes a first pH meter 410 for measuring the acidity of the acidic water stored in the first tank 150, and a first valve 420 configured to control the opening of the piping that supplies the acidic water stored in the first tank 150 to the vent gas treatment equipment 160 according to the acidity measured by the first pH meter 410.

[0154] For example, if the pH measured by the first pH meter 410 is low, this means that the acidic water has high cleaning performance, and this allows the opening of the first valve 420 to be reduced, thereby controlling the flow rate of acidic water flowing in as cleaning water.

[0155] Figure 13 proposes a structure that, in addition to the configuration of Figure 11, includes a second pH meter 510 for measuring the acidity of treated water in the vent gas treatment facility, and a second valve 520 configured to control the opening of the piping that supplies acidic water stored in the first tank 150 to the vent gas treatment facility 160 according to the acidity measured by the second pH meter 510.

[0156] This allows for the control of the supply of cleaning water in accordance with wastewater discharge regulations to meet the acidity standard value within the vent gas treatment facility 160.

[0157] Figure 14 proposes a structure that, in addition to the configuration of Figure 12, includes a third pH meter 610 for measuring the acidity of wastewater treated by the vent gas treatment equipment 160, and third valves 620 and 630 configured to mix acidic water stored in the first tank 150 with the wastewater treated by the vent gas treatment equipment 160 for neutralization treatment, according to the acidity measured by the third pH meter 610.

[0158] In other words, as a configuration for neutralizing acidic water and alkaline water containing ammonia by mixing them based on the pH of the wastewater, a third tank (not shown) or a neutralization tank (not shown) may be further included to efficiently carry out such a neutralization action, and the third pH meter 610 may be placed in such a third tank.

[0159] The ammonia vent gas treatment system and control method using the same according to other embodiments of the present invention shown in Figures 8 to 14 can be applied to the ammonia propulsion vessels 1, 2, 3, and 4 shown in Figures 1 to 7, or to the vent gas treatment system and control method using the same according to one embodiment of the present invention applicable to ammonia propulsion vessels 1, 2, 3, and 4.

[0160] Conversely, the vent gas treatment system and control method using the same shown in Figures 1 to 7 can be applied to the ammonia propulsion vessel 5 shown in Figures 8 to 14 or to the vent gas treatment system and control method using the same according to other embodiments of the present invention applicable to the ammonia propulsion vessel 5.

[0161] For example, when implementing at least one of the treatment apparatus 50, vent gas treatment equipment 50, KOD(C1), first vent gas treatment equipment C2, scrubber C2-1, and absorption tank C2-2 shown in Figures 1 to 7, at least one of the configurations and operating principles of the first scrubber 140, first tank 150, second tank 170, vent gas treatment equipment 160, clean water scrubber 210, and acidic water scrubber 220 shown in Figures 8 to 14 can be applied, and vice versa.

[0162] The detailed description of preferred embodiments of the present invention disclosed above has been provided so that those skilled in the art may embody and practice the invention. While the above description has been based on reference to preferred embodiments of the invention, those skilled in the art will understand that the invention can be modified and altered in various ways without departing from the scope of the invention.

[0163] For example, a person skilled in the art can utilize the configurations described in the above-described embodiments by combining them with each other.

[0164] Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to provide the broadest possible scope consistent with the principles and novel features disclosed herein.

[0165] The detailed description of preferred embodiments of the present invention disclosed above is provided to enable those skilled in the art to embody and practice the invention. While preferred embodiments of the invention have been described above with reference, those skilled in the art will understand that the invention can be modified and altered in various ways without departing from the scope of the invention. For example, those skilled in the art can utilize the configurations described in the embodiments above by combining them with one another.

[0166] Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to provide the broadest possible scope consistent with the principles and novel features disclosed herein. [Industrial applicability]

[0167] The vent gas treatment system for ammonia-powered vessels according to the embodiment of the present invention described above can be applied not only to merchant ships that transport cargo from their origin to their destination, but also to various other marine vessels that use ammonia as fuel.

Claims

1. A vent gas treatment facility configured to recover and treat ammonia discharged from an ammonia fuel consumer or an intermediate facility that supplies ammonia fuel to the consumer, A wastewater tank for storing ammonia water discharged from the vent gas treatment facility, A vent gas treatment system for an ammonia-propelled vessel, characterized by including a gas pipe that returns ammonia gas generated from the tank to the vent gas treatment equipment.

2. The aforementioned vent gas treatment equipment is A scrubber that absorbs ammonia by spraying an absorbent into the vent gas, The vent gas treatment system for an ammonia-propelled ship according to claim 1, further comprising: an absorption tank for storing the absorbent and for absorbing ammonia from the vent gas directly injected into the stored absorbent.

3. The vent gas treatment system for an ammonia-propelled vessel according to claim 2, wherein the ammonia gas generated in the wastewater tank is returned to the vent gas treatment facility via gas piping connected to a portion of the space between the scrubber and the absorption tank.

4. The vent gas treatment system for an ammonia-propelled ship according to claim 3, further comprising a gas detector on the piping from which the vent gas is discharged for detecting the ammonia gas concentration of the vent gas.

5. The aforementioned intermediate configuration corresponds to a fuel supply valve, If the ammonia gas concentration of the vent gas discharged from the vent gas treatment facility is above a predetermined level, The vent gas treatment system for an ammonia-propelled ship according to claim 1, wherein, when the fuel supply valve is open, the ammonia gas concentration of the vent gas is adjusted to below the predetermined level by supplying water.

6. The vent gas treatment system for an ammonia-propelled ship according to claim 5, wherein, when the fuel supply valve is closed, the ammonia gas concentration of the vent gas is adjusted to below the predetermined level by air blowing.

7. It also includes Knockout Drum (KOD), The vent gas treatment system for an ammonia-propelled vessel according to claim 1, further comprising a recovery tank for storing ammonia water discharged from the knockout drum.

8. The vent gas treatment system for an ammonia-propelled ship according to claim 7, wherein the ammonia gas generated in the recovery tank and the ammonia recovered from the intermediate configuration are supplied to the knockout drum via a single inlet pipe.

9. The ammonia-propelled vessel is A fuel storage unit for storing ammonia, A fuel supply unit receives ammonia from the fuel storage unit and supplies ammonia to the customer, The vent gas treatment system for an ammonia-propelled ship according to claim 1, comprising a fuel supply valve provided between the fuel supply unit and the customer for shutting off the supply of ammonia.

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