Fuel processing system and fuel processing method

Abstract

The present invention provides a fuel processing system and a fuel processing method, wherein the fuel processing system comprises: a fuel tank for supplying fuel to an engine; a collection tank for receiving surplus fuel recovered from the engine; a discharge processing unit for receiving the fuel from the collection tank; a discharge line connecting the collection tank to the discharge processing unit; a recovery line connecting the fuel tank to the collection tank; and a control valve unit for determining the flow path of the collected fuel stored in the collection tank toward the discharge line or the recovery line.

Description

Fuel processing system and fuel processing method

[0001] The present invention relates to a fuel processing system and a fuel processing method.

[0002] Ammonia is a chemical that can be produced, stored, transported, and supplied, and ammonia ships that use ammonia as fuel are being developed as eco-friendly vessels.

[0003] However, as air pollution becomes severe worldwide, the International Maritime Organization (IMO), the European Union, the United States, and others are strengthening regulations on pollutants emitted from ships.

[0004] In other words, for ships using liquid ammonia as fuel, it is necessary to reduce the concentration of ammonia gas emitted into the atmosphere, and in addition, to reduce the risk of explosion caused by the generation of evaporated gas and improve energy efficiency.

[0005] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art.

[0006] The present invention aims to provide a fuel processing system and a fuel processing method. However, these objectives are exemplary and do not limit the scope of the present invention.

[0007] One aspect of the present invention provides a fuel processing system comprising: a fuel tank for supplying fuel to an engine; a collection tank for receiving excess fuel recovered from the engine; a discharge processing unit for receiving fuel from the collection tank; a discharge line connecting the collection tank and the discharge processing unit; a recovery line connecting the fuel tank and the collection tank; and a valve unit for determining the flow path of the collected fuel stored in the collection tank to the discharge line or the recovery line.

[0008] A fuel processing system and a fuel processing method according to one embodiment of the present invention can transfer fuel to either a discharge processing unit or a fuel tank depending on the condition of the collected fuel inside the collection tank. Thus, the concentration of harmful substances discharged outside the vessel can be reduced, and fuel efficiency can be improved.

[0009] Of course, the scope of the present invention is not limited by these effects.

[0010] FIG. 1 is a drawing illustrating a ship including a fuel processing system according to one embodiment of the present invention.

[0011] FIG. 2 is a drawing illustrating a fuel processing system according to one embodiment of the present invention.

[0012] FIGS. 3 and 4 are drawings showing the flow path of fuel according to the operation of a fuel processing system according to an embodiment of the present invention.

[0013] FIG. 5 is a configuration diagram illustrating a part of the configuration of a fuel processing system according to one embodiment of the present invention.

[0014] FIG. 6 is a flowchart illustrating a fuel processing method according to one embodiment of the present invention.

[0015] FIG. 7 is a flowchart illustrating a fuel processing method according to another embodiment of the present invention.

[0016] Figure 8 is a flowchart illustrating some steps of Figure 7 in detail.

[0017] FIG. 9 is a flowchart illustrating a fuel processing method according to another embodiment of the present invention.

[0018] Figure 10 is a flowchart illustrating some steps of Figure 9 in detail.

[0019] According to one embodiment of the present invention, a fuel processing system is provided comprising: a fuel tank for supplying fuel to an engine; a collection tank for receiving excess fuel recovered from the engine; a discharge processing unit for receiving fuel from the collection tank; a discharge line connecting the collection tank and the discharge processing unit; a recovery line connecting the fuel tank and the collection tank; and a valve unit for determining a flow path of the collected fuel stored in the collection tank to the discharge line or the recovery line.

[0020] In addition, the fuel processing system may further include a control unit that controls the operation of the valve unit to open or close the flow path of the collected fuel to the discharge line or the recovery line.

[0021] Additionally, the valve unit includes a discharge control valve disposed on the discharge line and a recovery control valve disposed on the recovery line, and the control unit can control the operation of the discharge control valve and the recovery control valve.

[0022] In addition, the control unit can control the operation of the control valve unit so that either the discharge line or the recovery line is opened.

[0023] In addition, it may further include a sensor unit for acquiring information on the collected fuel.

[0024] In addition, the sensor unit can measure the ammonia concentration value of the collected fuel.

[0025] In addition, the control unit can control the operation of the valve unit based on the ammonia concentration value.

[0026] In addition, the sensor unit can measure the level value of the collected fuel.

[0027] In addition, the control unit can control the operation of the valve unit based on the water level value.

[0028] Another aspect of the present invention provides a fuel processing method comprising the steps of measuring information of collected fuel stored in a collection tank that receives excess fuel recovered from an engine, and transferring the collected fuel to a discharge processing unit or a fuel tank based on the information of the collected fuel.

[0029] In addition, the step of delivering the collected fuel can determine a flow path to a discharge line connecting the collection tank and the discharge processing unit of the collected fuel, or to a recovery line connecting the collection tank and the fuel tank.

[0030] In addition, the step of delivering the collected fuel can open or close the flow path to the discharge line or the recovery line.

[0031] In addition, the step of delivering the collected fuel can control the operation of a discharge control valve placed on the discharge line and a recovery control valve placed on the recovery line.

[0032] In addition, the step of measuring the information of the collected fuel can measure the ammonia concentration value of the collected fuel.

[0033] In addition, the step of measuring the information of the collected fuel can measure the water level value of the collected fuel.

[0034] The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms.

[0035] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted.

[0036] In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0037] In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0038] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description.

[0039] In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the following embodiments are not necessarily limited to those illustrated.

[0040] FIG. 1 is a drawing illustrating a ship including a fuel processing system according to one embodiment of the present invention.

[0041] Referring to FIG. 1, a vessel (1) according to one embodiment of the present invention may include a hull (H), a fuel processing system (10), a propeller (P), a living quarters (DH), and a mast (M).

[0042] The hull (H) may provide space for the configuration necessary for the navigation of the vessel (1). The hull (H) may provide space for the fuel processing system (10) to be installed. The hull (H) may also be further equipped with a cargo hold for loading cargo.

[0043] The fuel processing system (10) can rotate the propeller (P) using fuel. For example, the fuel processing system (10) can generate power using fuel or generate power using electricity generated from fuel and transmit it to the propeller (P). That is, the fuel processing system (10) can generate propulsion for the ship (1) by rotating the propeller (P) using energy generated from fuel.

[0044] The fuel processing system (10) can generate electricity using fuel. The fuel processing system (10) can generate electricity using fuel and deliver it to the accommodation area (DH). Thus, the fuel processing system (10) can provide the hotel power required for the navigation of the ship (1).

[0045] Not limited to the above description, the fuel processing system (10) can generate various types of energy required for the operation of a ship using fuel.

[0046] The propeller (P) can rotate to generate thrust for the vessel (1). The propeller (P) can provide thrust to the hull (H) by rotating using energy generated from the fuel processing system (10).

[0047] The accommodation area (DH) can provide a space where crew members or passengers can live and work. The accommodation area (DH) can provide a space where various activities necessary for the lives of personnel residing on the ship are carried out by receiving power from the fuel processing system (10).

[0048] A vent mast (M) is positioned on one side of the hull (H) to connect the fuel processing system (10) to the external space of the hull (H). By fluidly connecting the fuel processing system (10) to the outside, the vent mast (M) can discharge various gases generated in the fuel processing system (10) to the outside.

[0049] For example, the vent mast (M) is connected to the exhaust treatment unit (300) of the fuel treatment system (10) and can provide a path through which gas generated in the fuel treatment system (10) can be discharged to the outside.

[0050] The vent mast (M) may be provided in multiple numbers. Thus, various gases generated in the fuel processing system (10) can be quickly discharged to the outside.

[0051] FIG. 2 is a drawing illustrating a fuel processing system according to one embodiment of the present invention.

[0052] Referring to FIG. 2, a fuel processing system (10) according to one embodiment of the present invention may include a fuel tank (100), a collection tank (200), a discharge line (400), a recovery line (500), and a control valve unit (CVU).

[0053] The fuel tank (100) may have an internal space capable of accommodating fuel. The fuel tank (100) may separate the internal space spatially, fluidly, and thermally from the external space to isolate the fuel stored inside from the influence of the external environment.

[0054] The fuel tank (100) can store liquid fuel. The fuel tank (100) can store liquid fuel that has been compressed and cooled from gaseous fuel.

[0055] For example, the fuel tank (100) can store liquefied natural gas (LNG), liquefied petroleum gas (LPG), or liquefied hydrogen (LH2). However, for convenience of explanation, the following description will focus on an embodiment in which the fuel tank (100) stores liquid ammonia fuel.

[0056] The fuel tank (100) can supply fuel stored inside to the engine (EG). The fuel tank (100) is fluidly connected to the engine (EG) to supply fuel to the engine (EG). For example, the fuel tank (100) can supply fuel to the engine (EG) through a fuel supply line (SL) in which one end is connected to the fuel tank (100) and the other end is connected to the engine (EG).

[0057] The fuel tank (100) can transfer fuel to the engine (EG) using a hydraulic pump. The hydraulic pump can supply hydraulic energy to the fuel to form a flow of fuel.

[0058] In one embodiment, fuel can be supplied to the engine (EG) using a fuel tank (100), a low-pressure pump (LP), and a high-pressure pump (HP).

[0059] The low-pressure pump (LP) can draw out fuel contained inside the fuel tank (100) to the outside. The low-pressure pump (LP) is positioned on the fuel supply line (SL) to transfer hydraulic energy to the fuel. That is, the low-pressure pump (LP) can form a flow of fuel so that the fuel inside the fuel tank (100) flows toward the engine (EG).

[0060] FIG. 2 illustrates a single low-pressure pump (LP) placed on the fuel supply line (SL), but is not limited thereto. For example, multiple low-pressure pumps (LP) may be provided and connected in series or in parallel. Additionally, the low-pressure pump (LP) may be provided inside the fuel tank (100) or may be omitted.

[0061] The high-pressure pump (HP) may be placed on the fuel supply line (SL). The high-pressure pump (HP) may be placed on the fuel supply line (SL) but between the low-pressure pump (LP) and the engine (EG). That is, the high-pressure pump (HP) can receive fuel discharged from the low-pressure pump (LP).

[0062] A high-pressure pump (HP) can transfer fuel contained within a fuel tank (100) to an engine (EG). The high-pressure pump (HP) is positioned on a fuel supply line (SL) to transfer hydraulic energy to the fuel.

[0063] A high-pressure pump (HP) can supply hydraulic energy to fuel that is drawn out from inside the fuel tank (100) and flows within the fuel supply line (SL). The high-pressure pump (HP) can supply hydraulic energy so that the fuel within the fuel supply line (SL) has a hydraulic pressure that facilitates the operation of the engine (EG).

[0064] Figure 2 illustrates a single high-pressure pump (HP) placed on a fuel supply line (SL), but is not limited thereto, and multiple high-pressure pumps (HP) may be provided and connected in series or in parallel.

[0065] The temperature of the fuel delivered to the engine (EG) can be controlled. For example, a heat exchanger (HE) is placed between the high-pressure pump (HP) and the low-pressure pump (LP) to control the temperature of the fuel delivered to the engine (EG).

[0066] The heat exchanger (HE) is positioned upstream of the high-pressure pump (HP) to provide a space where heat exchange between the fuel and the heat transfer fluid can occur. The fuel passing through the heat exchanger (HE) can have a temperature corresponding to the required temperature of the engine (EG).

[0067] The heat exchanger (HE) may use fresh water, steam, and glycol water as the heat transfer medium, but is not limited thereto.

[0068] The engine (EG) can receive fuel from the fuel tank (100). The engine (EG) can receive fuel through the fuel supply line (SL) by receiving hydraulic energy from the low-pressure pump (LP) and the high-pressure pump (HP). The fuel delivered to the engine (EG) may be in a state where its temperature is controlled by the heat exchanger (HE).

[0069] The engine (EG) can produce energy using the fuel it receives. For example, the engine (EG) can generate power using the fuel and transmit it to the propeller (P). Alternatively, the engine (EG) can generate electricity using the fuel and transmit it to the residential area (DH).

[0070] The engine (EG) can discharge excess fuel. For example, when the engine (EG) terminates operation, it can discharge the remaining fuel inside to the collection tank (200). The engine (EG) can receive purging gas through a separate purging gas line (not shown) and transfer the excess fuel inside to the collection tank (200). That is, when the engine (EG) terminates operation, it can transfer excess fuel containing purging gas to the collection tank (200).

[0071] The collection tank (200) can receive excess fuel recovered from the engine (EG). The collection tank (200) is connected to the engine (EG) through a fuel return line (RL) and can receive excess fuel discharged from the engine (EG). The collection tank (200) can store the excess fuel received from the engine (EG).

[0072] In the following, 'liquid fuel' is defined as fuel in a liquid state. Additionally, 'gaseous fuel' is defined in the following as fuel in a gaseous state, consisting of a mixture of pure fuel components and purging gas generated during the operation of a fuel processing system.

[0073] In the following, 'collected fuel' is defined as fuel stored inside a collection tank (200), including both liquid fuel and gaseous fuel.

[0074] The collection tank (200) can be connected to the fuel supply line (SL) through the fuel replenishment line (RTL). The collection tank (200) can be connected to the fuel supply line (SL) between the low-pressure pump (LP) and the high-pressure pump (HP) through the fuel replenishment line (RTL). That is, the collection tank (200) is connected upstream of the high-pressure pump (HP) to supply collected fuel to the high-pressure pump (HP).

[0075] The collection tank (200) can supply liquid fuel to the high-pressure pump (HP). The collection tank (200) can separate the collected fuel into gas and liquid phases and transfer the liquid fuel from the collected fuel to the high-pressure pump (HP) through the fuel replenishment line (RTL).

[0076] The collection tank (200) can replenish the fuel required for the operation of the high-pressure pump (HP). The collection tank (200) is connected upstream of the high-pressure pump (HP) and can replenish the hydraulic pressure upstream of the high-pressure pump (HP) for normal operation of the high-pressure pump (HP). Thus, the high-pressure pump (HP) can receive a stable supply of fuel from the low-pressure pump (LP) and the collection tank (200), thereby improving its durability.

[0077] The temperature of the fuel transferred from the collection tank (200) to the high-pressure pump (HP) can be controlled. For example, a cooler (C) may be placed on the fuel replenishment line (RTL) to control the temperature of the fuel transferred from the collection tank (200) to the high-pressure pump (HP).

[0078] The collection tank (200) can transfer fuel to the discharge processing unit (300) and the fuel tank (100). The collection tank (200) can separate the collected fuel into gas and liquid and transfer the gaseous fuel among the collected fuel to the discharge processing unit (300) and the fuel tank (100).

[0079] The cooler (C) can cool the fuel being transferred from the collection tank (200) to the fuel supply line (SL). The cooler (C) can be placed on the fuel replenishment line (RTL) to provide a space where heat exchange between the fuel and the refrigerant can occur. The fuel passing through the cooler (C) is cooled so that liquid fuel can be stably supplied to the high-pressure pump (HP).

[0080] The discharge line (400) can deliver fuel to the discharge processing unit (300). The discharge line (400) can deliver some of the excess fuel recovered from the engine (EG) to the discharge processing unit (300). The discharge line (400) can deliver gaseous fuel among the fuel recovered from the engine (EG) and stored in the collection tank (200) to the discharge processing unit (300).

[0081] One end of the discharge line (400) may be connected to the collection tank (200) and the other end may be connected to the discharge processing unit (300). The discharge line (400) may provide a path through which gaseous fuel stored inside the collection tank (200) can be discharged to the discharge processing unit (300).

[0082] The recovery line (500) can deliver fuel to the fuel tank (100). The recovery line (500) can deliver some of the excess fuel recovered from the engine (EG) to the fuel tank (100). The recovery line (500) can deliver gaseous fuel among the fuel recovered from the engine (EG) and stored in the collection tank (200) to the fuel tank (100).

[0083] One end of the recovery line (500) may be connected to the collection tank (200) and the other end may be connected to the fuel tank (100). The recovery line (500) may provide a path through which gaseous fuel stored inside the collection tank (200) can be discharged to the fuel tank (100).

[0084] The recovery line (500) can reduce the amount of fuel delivered through the discharge line (400). The recovery line (500) can reduce the amount of gaseous fuel delivered to the discharge line (400) by delivering some of the gaseous fuel stored inside the collection tank (200) to the fuel tank (100). Thus, the amount of ammonia discharged to the outside of the vessel (1) through the discharge treatment unit (300) can be reduced.

[0085] The recovery line (500) can provide a path for gaseous fuel inside the collection tank (200) to circulate into the fuel processing system (10).

[0086] In one embodiment, the recovery line (500) may be connected to a vapor header (not shown) of the fuel tank (100). Gaseous fuel delivered to the vapor header through the recovery line (500) may be stored in the fuel tank (100), or converted into liquid fuel through a separately provided re-liquefaction device (not shown) and stored in the fuel tank (100).

[0087] Some of the gaseous fuel stored in the collection tank (200) is stored in the fuel tank (100), so that the gaseous fuel stored inside the collection tank (200) can be recirculated within the fuel processing system (10). In addition, the amount of ammonia discharged outside the vessel (1) can be minimized.

[0088] The discharge line (400) and the recovery line (500) can provide a path through which fuel stored inside the collection tank (200) can flow. The discharge line (400) and the recovery line (500) are fluidically connected to the collection tank (200) to provide a path through which gaseous fuel inside the collection tank (200) can be delivered.

[0089] Gaseous fuel stored inside the collection tank (200) can be discharged outside the vessel (1) through the discharge line (400) or transferred to the fuel tank (100) through the recovery line (500) to recirculate the fuel processing system (10).

[0090] Either of the discharge line (400) and the recovery line (500) can be opened. In other words, the flow path of the collected fuel stored in the collection tank (200) can be determined so that it moves through either the discharge line (400) or the recovery line (500). Thus, the collected fuel can be delivered to either the discharge processing unit (300) or the fuel tank (100).

[0091] In the following, the 'unstable state' is defined as a state in which excess fuel is delivered from the engine (EG) at the beginning of the purging procedure of the fuel processing system (10) and has a large effect on the water level value inside the collection tank (200). Additionally, the 'stable state' is defined as a state in which excess fuel is delivered from the engine (EG) at the end of the purging procedure of the fuel processing system (10) and has a small effect on the water level value inside the collection tank (200).

[0092] In the following, 'change amount' is defined as the total amount of change in a target value over a certain period, calculated as the sum of the absolute values ​​of individual changes over time. In other words, even if the target value changes over a certain period and the starting and ending values ​​are the same, if the sum of the individual changes in between is large, the change amount is calculated as the larger value.

[0093] The control valve unit (CVU) can determine the flow path of the collected fuel stored inside the collection tank (200). The control valve unit (CVU) can determine the flow path of the gaseous fuel among the collected fuel inside the collection tank (200).

[0094] The control valve unit (CVU) includes a discharge control valve (CV1) and a recovery control valve (CV2) to determine the flow path to the discharge line (400) or recovery line (500) of the collected fuel. In other words, the control valve unit (CVU) can determine the flow path to the discharge line (400) or recovery line (500) of the gaseous fuel among the collected fuel.

[0095] In one embodiment, the control valve unit (CVU) can set a flow path so that when the ammonia concentration value of the collected fuel is high, the collected fuel flows toward the fuel tank (100) through the recovery line (500).

[0096] The control valve unit (CVU) can set a flow path so that when the ammonia concentration value of the collected fuel stored in the collection tank (200) is low, the collected fuel flows toward the discharge processing unit (300) through the discharge line (400). Thus, gaseous fuel with a high ammonia concentration value is recovered to the fuel tank (100), and liquid fuel with a low ammonia concentration value can be discharged to the outside of the vessel (1) through the discharge processing unit (300).

[0097] In another embodiment, the control valve unit (CVU) can set a flow path so that the collected fuel flows toward the fuel tank (100) through the recovery line (500) when the change in the level value of the collected fuel stored in the collection tank (200) is large.

[0098] The control valve unit (CVU) can set a flow path so that when the change in the liquid fuel level value among the collected fuel stored in the collection tank (200) is small, the collected fuel flows toward the discharge processing unit (300) through the discharge line (400).

[0099] When the amount of change in the water level inside the collection tank (200) is large, the collection tank (200) is in an unstable state, so the ammonia concentration of the excess fuel delivered from the engine (EG) may be high.

[0100] On the other hand, when the change in the water level value inside the collection tank (200) is small, the collection tank (200) is in a stable state, so the ammonia concentration of the excess fuel delivered from the engine (EG) can be low. Thus, gaseous fuel with a high ammonia concentration is recovered into the fuel tank (100), and liquid fuel with a low ammonia concentration can be discharged to the outside of the ship (1) through the discharge treatment unit (300).

[0101] A discharge control valve (CV1) may be placed on the discharge line (400). The discharge control valve (CV1) may be placed on the discharge line (400) to control the flow of fuel passing through the discharge line (400). The discharge control valve (CV1) may open and close the discharge line (400) to regulate the flow rate or pressure of fuel transferred from the collection tank (200) to the discharge processing unit (300).

[0102] In one embodiment, the operation of the discharge control valve (CV1) can be controlled according to the ammonia concentration value of the collected fuel. Specifically, the operation of the discharge control valve (CV1) can be controlled so that the discharge line (400) opens and closes according to the ammonia concentration value of the gaseous fuel inside the collection tank (200).

[0103] In another embodiment, the discharge control valve (CV1) can be driven according to the water level value inside the collection tank (200). Specifically, the discharge control valve (CV1) can be driven so that the discharge line (400) opens and closes according to the amount of change in the water level value of the liquid fuel among the collected fuel stored inside the collection tank (200).

[0104] A recovery control valve (CV2) may be placed on the recovery line (500). The recovery control valve (CV2) may be placed on the recovery line (500) to control the flow of fuel passing through the recovery line (500). The recovery control valve (CV2) may open and close the recovery line (500) to regulate the flow rate or pressure of fuel transferred from the collection tank (200) to the fuel tank (100).

[0105] In one embodiment, the recovery control valve (CV2) can be driven according to the ammonia concentration value inside the collection tank (200). Specifically, the recovery control valve (CV2) can be driven so that the recovery line (500) is opened or closed according to the ammonia concentration value of the gaseous fuel among the collected fuel inside the collection tank (200).

[0106] In another embodiment, the recovery control valve (CV2) can be controlled according to the amount of change in the liquid level inside the collection tank (200). Specifically, the recovery control valve (CV2) can be driven so that the recovery line (500) opens and closes according to the amount of change in the liquid fuel level stored inside the collection tank (200).

[0107] The discharge processing unit (300) can be connected to the collection tank (200). The discharge processing unit (300) is fluidically connected to the collection tank (200) and can receive gaseous fuel stored inside the collection tank (200). The discharge processing unit (300) can receive gaseous fuel stored inside the collection tank (200) through the discharge line (400).

[0108] The discharge treatment unit (300) can be connected to the knockout drum (K). The discharge treatment unit (300) is fluidically connected to the knockout drum (K) to receive gaseous fuel among the fuel discharged from the engine (EG).

[0109] The discharge processing unit (300) can discharge the received gaseous fuel to the outside. The discharge processing unit (300) is connected to the vent mast (M) of the vessel (1) and can be fluidly connected to the outside. That is, the discharge processing unit (300) can discharge the gaseous fuel received from the collection tank (200) and the knockout drum (K) to the outside through the vent mast (M).

[0110] The exhaust treatment unit (300) may be equipped with a configuration for reducing the ammonia concentration of the gaseous fuel. For example, the exhaust treatment unit (300) may further include a configuration such as an absorption tank (not shown) for dissolving ammonia in water or a neutralizing agent, a combustion device (not shown) for burning ammonia, a scrubber (not shown), or a demister (not shown) to lower the ammonia concentration of the gaseous fuel discharged to the outside of the vessel (1). Thus, the gas discharged from the vessel (1) through the exhaust treatment unit (300) may have an ammonia concentration below a standard value.

[0111] The knockout drum (K) can be positioned between the engine (EG) and the exhaust treatment unit (300). Specifically, the knockout drum (K) can be positioned on a drum line (DL) that fluidically connects the engine (EG) and the exhaust treatment unit (300).

[0112] The knockout drum (K) can receive excess fuel from the engine (EG). The knockout drum (K) can receive some of the excess fuel recovered from the engine (EG) through the drum line (DL).

[0113] The knockout drum (K) can process fuel delivered from the engine (EG). For example, the knockout drum (K) can separate lubricating oil from the liquid fuel. Specifically, the knockout drum (K) can discharge the liquid fuel into the gaseous phase and the lubricating oil into the liquid phase. That is, the knockout drum (K) can perform a gas-liquid separation function.

[0114] The knockout drum (K) can transfer fuel to the discharge processing unit (300). The knockout drum (K) can transfer gaseous fuel to the discharge processing unit (300) through the drum line (DL). Thus, the knockout drum (K) can discharge fuel to the outside of the vessel (1) through the discharge processing unit (300).

[0115] FIGS. 3 and 4 are drawings showing the flow path of fuel according to the operation of a fuel processing system according to an embodiment of the present invention.

[0116] Referring to FIG. 3, a fuel processing system (10) according to one embodiment of the present invention can transfer collected fuel stored inside a collection tank (200) to a discharge processing unit (300). The fuel processing system (10) can transfer gaseous fuel among the collected fuel to a discharge processing unit (300).

[0117] The control valve unit (CVU) can set a flow path so that when the ammonia concentration value of the collected fuel stored in the collection tank (200) is low, the collected fuel flows toward the discharge processing unit (300) through the discharge line (400).

[0118] The control valve unit (CVU) can set a flow path so that when the change in the liquid fuel level value among the collected fuel stored in the collection tank (200) is small, the collected fuel flows toward the discharge processing unit (300) through the discharge line (400).

[0119] Thus, liquid fuel having a low ammonia concentration value can be discharged to the outside of the vessel (1) through the discharge treatment unit (300).

[0120] In one embodiment, the discharge control valve (CV1) can open the discharge line (400) when the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is low, thereby transferring the gaseous fuel among the collected fuel to the discharge processing unit (300).

[0121] The discharge control valve (CV1) can open the discharge line (400) when it is determined that the ammonia concentration value inside the collection tank (200) is below a preset concentration value.

[0122] In detail, the discharge control valve (CV1) can open the discharge line (400) when it is determined that the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is below a preset value. That is, when the gaseous fuel stored inside the collection tank (200) has a low ammonia concentration, the gaseous fuel can be discharged to the outside of the vessel (1).

[0123] In another embodiment, the discharge control valve (CV1) is opened when the change in water level value is low, so that gaseous fuel among the collected fuel can be transferred to the discharge processing unit (300).

[0124] The discharge control valve (CV1) can open the discharge line (400) when it is determined that the change in the water level value inside the collection tank (200) is less than or equal to a preset change in the water level value.

[0125] In detail, the discharge control valve (CV1) can open the discharge line (400) when it is determined that the change in the liquid fuel level value stored inside the collection tank (200) is less than or equal to a preset change in the liquid fuel level value.

[0126] When the change in the liquid fuel level value stored inside the collection tank (200) is small, the fuel processing system (10) is in a stable state, so the ammonia concentration value of the excess fuel delivered from the engine (EG) can be small. That is, when the gaseous fuel stored inside the collection tank (200) has a low ammonia concentration value, the gaseous fuel can be discharged to the outside of the ship (1) through the discharge processing unit (300).

[0127] In one embodiment, the recovery control valve (CV2) is closed when the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is low, so that the gaseous fuel among the collected fuel can remain inside the collection tank (200).

[0128] The recovery control valve (CV2) can close the discharge line (400) when it is determined that the ammonia concentration value inside the collection tank (200) is below a preset value. Specifically, the recovery control valve (CV2) can close the discharge line (400) when it is determined that the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is below a preset value.

[0129] That is, if the gaseous fuel stored inside the collection tank (200) has a low ammonia concentration, the gaseous fuel may remain inside the collection tank (200).

[0130] In another embodiment, the recovery control valve (CV2) may close the discharge line (400) when the change in the liquid fuel level value stored inside the collection tank (200) is small, thereby allowing gaseous fuel among the collected fuel to remain inside the collection tank (200).

[0131] The recovery control valve (CV2) can close the discharge line (400) when it is determined that the amount of change in the water level inside the collection tank (200) is less than or equal to a preset amount of change in the water level. Specifically, the recovery control valve (CV2) can close the discharge line (400) when it is determined that the amount of change in the water level of the liquid fuel stored inside the collection tank (200) is less than or equal to a preset amount of change.

[0132] When the amount of change in the liquid fuel level value stored inside the collection tank (200) is small, the collection tank (200) is in a stable state, so the ammonia concentration value of the excess fuel delivered from the engine (EG) may be small.

[0133] That is, if the gaseous fuel stored inside the collection tank (200) has a low ammonia concentration, the gaseous fuel may remain inside the fuel tank (100).

[0134] Referring to FIG. 4, a fuel processing system (10) according to one embodiment of the present invention can transfer collected fuel stored inside a collection tank (200) to a fuel tank (100). The fuel processing system (10) can transfer gaseous fuel among the collected fuel to the fuel tank (100) so that the fuel is recirculated within the fuel processing system (10).

[0135] The control valve unit (CVU) can set a flow path so that when the ammonia concentration value of the collected fuel stored in the collection tank (200) is high, the collected fuel flows toward the fuel tank (100) through the recovery line (500).

[0136] The control valve unit (CVU) can set a flow path so that when the change in the liquid fuel level value among the collected fuel stored in the collection tank (200) is large, the collected fuel flows toward the fuel tank (100) through the recovery line (500).

[0137] Thus, gaseous fuel having a high ammonia concentration value can be recovered into a fuel tank (100) and recirculated within a fuel processing system (10).

[0138] In one embodiment, the discharge control valve (CV1) is closed when the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is high, so that the gaseous fuel among the collected fuel can remain inside the collection tank (200).

[0139] The discharge control valve (CV1) can close the discharge line (400) when it is determined that the ammonia concentration value inside the collection tank (200) exceeds a preset concentration value. Specifically, the discharge control valve (CV1) can close the discharge line (400) when it is determined that the ammonia concentration value of the gaseous fuel inside the collection tank (200) exceeds a preset concentration value. That is, if the gaseous fuel stored inside the collection tank (200) has a high ammonia concentration, the gaseous fuel may remain inside the collection tank (200).

[0140] In another embodiment, the discharge control valve (CV1) may close the discharge line (400) when the change in the level value of the collected fuel stored inside the collection tank (200) is large, thereby allowing the gaseous fuel among the collected fuel to remain inside the collection tank (200).

[0141] The discharge control valve (CV1) can close the discharge line (400) if it is determined that the amount of change in the water level inside the collection tank 0 exceeds a preset amount of change in the water level. Specifically, the discharge control valve (CV1) can close the discharge line (400) if it is determined that the amount of change in the water level of the liquid fuel stored inside the collection tank (200) exceeds a preset amount of change in the water level.

[0142] When the change in the liquid fuel level value stored inside the collection tank (200) is large, the collection tank (200) is in an unstable state, so the ammonia concentration value of the excess fuel delivered from the engine (EG) may be large. That is, when the gaseous fuel stored inside the collection tank (200) has a high ammonia concentration value, the gaseous fuel may remain inside the collection tank (200).

[0143] In one embodiment, the recovery control valve (CV2) can open the recovery line (500) when the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) is high, thereby transferring the gaseous fuel among the collected fuel to the fuel tank (100).

[0144] The recovery control valve (CV2) can open the recovery line (500) when it is determined that the ammonia concentration value inside the collection tank (200) exceeds a preset concentration value. Specifically, the recovery control valve (CV2) can open the recovery line (500) when it is determined that the ammonia concentration value of the gaseous fuel inside the collection tank (200) exceeds a preset concentration value.

[0145] That is, when the gaseous fuel stored inside the collection tank (200) has a high ammonia concentration, the gaseous fuel can be recovered to the fuel tank (100) and recirculated within the fuel processing system (10).

[0146] In another embodiment, the recovery control valve (CV2) is opened when the change in the liquid fuel level value stored inside the collection tank (200) is large, so that gaseous fuel among the collected fuel can be transferred to the fuel tank (100).

[0147] The recovery control valve (CV2) can open the recovery line (500) when it is determined that the amount of change in the water level value inside the collection tank 0 exceeds a preset amount of change in the water level value. Specifically, the recovery control valve (CV2) can open the recovery line (500) when it is determined that the amount of change in the water level value of the liquid fuel among the collected fuel inside the collection tank (200) exceeds a preset amount of change in the water level value.

[0148] When the change in the liquid fuel level value stored inside the collection tank (200) is large, the collection tank (200) is in an unstable state, so the ammonia concentration value of the excess fuel delivered from the engine (EG) may be large.

[0149] That is, when the gaseous fuel stored inside the collection tank (200) has a high ammonia concentration, the gaseous fuel can be recovered to the fuel tank (100) and recirculated within the fuel processing system (10).

[0150] FIG. 5 is a configuration diagram illustrating a part of the configuration of a fuel processing system according to one embodiment of the present invention.

[0151] Referring to FIG. 5, a fuel processing system (10) according to one embodiment of the present invention may further include a sensor unit (600) and a control unit (700).

[0152] The sensor unit (600) can measure fuel information inside the collection tank (200). The sensor unit (600) can obtain information about the collected fuel stored in the collection tank (200). In one embodiment, the sensor unit (600) may include a concentration sensor (610) and a water level sensor (620).

[0153] The concentration sensor (610) can measure the ammonia concentration value of the collected fuel stored inside the collection tank (200). Specifically, the concentration sensor (610) can measure the ammonia concentration value of the gaseous fuel among the collected fuel stored inside the collection tank (200).

[0154] The concentration sensor (610) can provide a basis for the control unit (700) to determine whether gaseous fuel stored inside the collection tank (200) can be reused within the fuel processing system (10).

[0155] For example, the concentration sensor (610) may be placed inside the collection tank (200). The concentration sensor (610) may be located inside the collection tank (200), but positioned at the top to measure the concentration of gaseous fuel. However, the placement location of the concentration sensor (610) is not limited to this.

[0156] The level sensor (620) can measure the level of collected fuel stored inside the collection tank (200). Specifically, the level sensor (620) can measure the level of liquid fuel among the collected fuel stored inside the collection tank (200).

[0157] The amount of change in the water level value serves as a basis for determining whether the fuel processing system (10) is in a stable state, and serves as a basis for calculating the ammonia concentration of the gaseous fuel among the collected fuel stored inside the collection tank (200).

[0158] Thus, the water level sensor (620) can provide a basis for the control unit (700) to determine whether the gaseous fuel stored inside the collection tank (200) can be reused within the fuel processing system (10).

[0159] The sensor unit (600) can transmit information about the collected fuel to the control unit (700). The sensor unit (600) can transmit information about the ammonia concentration value of the collected fuel or information about the water level value of the collected fuel to the control unit (700).

[0160] The control unit (700) is connected to the control valve unit (CVU) and can control the operation of the control valve unit (CVU). Specifically, the control unit (700) can control the operation of the control valve unit (CVU) to open or close the flow path to the discharge line (400) or recovery line (500) of the collected fuel.

[0161] The control unit (700) can determine the flow path to the discharge line (400) or recovery line (500) of the collected fuel by controlling the operation of the discharge control valve (CV1) and the recovery control valve (CV2).

[0162] The control unit (700) can control the operation of the control valve unit (CVU) so that either the discharge line (400) or the recovery line (500) is opened and the other is closed.

[0163] For example, the control unit (700) can control the operation of the control valve unit (CVU) so that the recovery line (500) is closed when the discharge line (400) is opened. Alternatively, the control unit (700) can control the operation of the control valve unit (CVU) so that the recovery line (500) is opened when the discharge line (400) is closed.

[0164] Thus, the control unit (700) can form a flow path so that the collected fuel stored inside the collection tank (200) is transferred to either the fuel tank (100) or the discharge processing unit (300).

[0165] The control unit (700) can control the operation of the control valve unit (CVU) based on fuel information received from the sensor unit (600). The control unit (700) can control the operation of the discharge control valve (CV1) and the recovery control valve (CV2) based on the ammonia concentration value or fuel level value inside the collection tank (200).

[0166] In one embodiment, the control unit (700) may include a first control module (710) and a second control module (720).

[0167] The first control module (710) can control the operation of the control valve unit (CVU) based on the ammonia concentration value received from the sensor unit (600). Specifically, the first control module (710) can control the operation of the discharge control valve (CV1) and the recovery control valve (CV2) based on the ammonia concentration value.

[0168] The first control module (710) can control the operation of the control valve unit (CVU) so that when the ammonia concentration value exceeds a preset concentration value, the discharge line (400) is closed and the recovery line (500) is opened.

[0169] In other words, the first control module (710) can determine the flow direction of the fuel so that gaseous fuel among the collected fuel flows toward the fuel tank (100) when the ammonia concentration value exceeds a preset concentration value. Thus, the first control module (710) can deliver the gaseous fuel to the fuel tank (100) when the gaseous fuel inside the collection tank (200) has a high ammonia concentration.

[0170] The first control module (710) can control the operation of the control valve unit (CVU) so that when the ammonia concentration value is below a preset concentration value, the discharge line (400) is opened and the recovery line (500) is closed.

[0171] In other words, the first control module (710) can determine the flow direction of the fuel so that the gaseous fuel among the collected fuel flows toward the discharge processing unit (300) when the ammonia concentration value is less than or equal to a preset concentration value. Thus, the first control module (710) can deliver the gaseous fuel to the discharge processing unit (300) when the gaseous fuel inside the collection tank (200) has a low ammonia concentration.

[0172] The second control module (720) can calculate the amount of change in the water level value using information regarding the water level value of the collected fuel. The second control module (720) can calculate the amount of change in the water level value using information regarding the water level value of the collected fuel over time.

[0173] The second control module (720) can control the operation of the control valve unit (CVU) based on the water level value from the sensor unit (600). Specifically, the second control module (720) can control the operation so that the discharge line (400) and the recovery line (500) are opened and closed based on the water level value.

[0174] The second control module (720) can control the operation of the control valve unit (CVU) so that when the amount of change in the water level exceeds a preset amount of change in the water level, the discharge line (400) is closed and the recovery line (500) is opened. In other words, the second control module (720) can determine the flow direction of the fuel so that when the amount of change in the water level is less than or equal to a preset value, the gaseous fuel stored inside the collection tank (200) flows toward the fuel tank (100).

[0175] When the fuel processing system (10) is in an unstable state because the change in water level exceeds the preset change in water level, the ammonia concentration of the excess fuel transferred from the engine (EG) to the collection tank (200) may be high.

[0176] The second control module (720) can transfer the gaseous fuel to the fuel tank (100) and recirculate it within the fuel processing system (10) when the gaseous fuel inside the collection tank (200) has a high ammonia concentration.

[0177] The second control module (720) can control the operation of the control valve unit (CVU) so that when the amount of change in the water level is less than or equal to a preset amount of change in the water level, the discharge control valve (CV1) is opened and the recovery control valve (CV2) is closed.

[0178] In other words, the second control module (720) can determine the flow direction of the fuel so that gaseous fuel among the collected fuel flows toward the discharge processing unit (300) when the amount of change in the water level is less than or equal to a preset amount of change in the water level.

[0179] When the amount of change in the water level is less than or equal to a preset value, the fuel processing system (10) may be in a stable state. At this time, the ammonia concentration value of the excess fuel transferred from the engine (EG) to the collection tank (200) may be small.

[0180] That is, the second control module (720) can transfer the gaseous fuel to the discharge treatment unit (300) and discharge it outside the vessel (1) when the gaseous fuel among the collected fuels has a low ammonia concentration.

[0181] The control valve unit (CVU) can be driven by receiving an electrical signal from the control unit (700). The control valve unit (CVU) is electrically connected to the control unit (700) and can be driven by receiving a control signal generated by the control unit (700).

[0182] The discharge control valve (CV1) and the recovery control valve (CV2) can receive a control signal generated by the control unit (700) and control the fuel flow within the discharge line (400) and the recovery line (500).

[0183] A fuel processing system according to one embodiment of the present invention and a ship including the same can reduce harmful substances discharged to the outside of the ship and improve fuel efficiency by forming different flow paths of collected fuel according to the state of collected fuel stored inside a collection tank.

[0184] A fuel processing system according to one embodiment of the present invention and a vessel including the same can transfer fuel to either a discharge processing unit or a fuel tank depending on the condition of the collected fuel inside the collection tank. Thus, the concentration of harmful substances discharged outside the vessel can be reduced and fuel efficiency can be improved.

[0185] FIG. 6 is a flowchart illustrating a fuel processing method according to one embodiment of the present invention.

[0186] Referring to FIG. 6, a fuel processing method according to one embodiment of the present invention may include a step of measuring information of collected fuel (S10) and a step of delivering collected fuel based on information of collected fuel (S20).

[0187] In the step (S10) of measuring information on collected fuel, information regarding the fuel inside the collection tank (200) can be obtained. In the step (S10) of measuring information on collected fuel, information regarding the collected fuel stored inside the collection tank (200) can be measured by the sensor unit (600).

[0188] The information regarding the fuel stored inside the collection tank (200) measured in the step (S10) of measuring the information of the collected fuel can be used as a basis for determining the flow direction of the fuel.

[0189] In the step of delivering the collected fuel (S20), the flow direction of the fuel can be determined based on the fuel information. Specifically, in the step of delivering the collected fuel (S20), the flow direction of the collected fuel can be determined using the information regarding the collected fuel obtained in the step of measuring the information of the collected fuel (S10).

[0190] In the step of delivering the collected fuel (S20), the collected fuel can be delivered to the discharge processing unit (300) or the fuel tank (100). Specifically, in the step of delivering the collected fuel (S20), a flow path to the discharge line (400) or recovery line (500) of the collected fuel can be determined. In the step of delivering the collected fuel (S20), the flow path of the collected fuel can be determined by opening or closing the flow path to the discharge line (400) or recovery line (500).

[0191] In the step (S20) of delivering the collected fuel, the flow path of the collected fuel can be determined by controlling the operation of the control valve unit (CVU).

[0192] In one embodiment, in the step (S20) of delivering collected fuel, the collected fuel can be delivered to the discharge processing unit (300) or the fuel tank (100) by opening either the discharge control valve (CV1) or the recovery control valve (CV2).

[0193] For example, in the step of delivering collected fuel (S20), the operation of the control valve unit (CVU) can be controlled so that the discharge control valve (CV1) is opened and the recovery control valve (CV2) is closed.

[0194] Alternatively, in the step (S20) of delivering the collected fuel, the operation of the control valve unit (CVU) can be controlled so that the discharge control valve (CV1) is closed and the recovery control valve (CV2) is opened. Thus, the collected fuel can be delivered to the discharge processing unit (300) through the discharge line (400) or to the fuel tank (100) through the recovery line (500).

[0195] FIG. 7 is a flowchart illustrating a fuel processing method according to another embodiment of the present invention.

[0196] Referring to FIG. 7, a fuel processing method according to another embodiment of the present invention may include the step of measuring the ammonia concentration value of the collected fuel (S10A) and the step of delivering the collected fuel based on the ammonia concentration value (S20A).

[0197] In the step (S10A) of measuring the ammonia concentration value, the ammonia concentration value inside the collection tank (200) can be measured. In the step (S10A) of measuring the ammonia concentration value, the ammonia concentration value of the gaseous fuel stored inside the collection tank (200) can be measured.

[0198] In the step (S10A) of measuring the ammonia concentration value, the ammonia concentration value inside the collection tank (200) can be measured by the sensor unit (600). The concentration sensor (610) can measure the ammonia concentration of the gaseous fuel stored inside the collection tank (200).

[0199] In the step of delivering the collected fuel based on the ammonia concentration value (S20A), the flow path of the collected fuel can be determined based on the ammonia concentration value measured in the step of measuring the ammonia concentration value (S10A).

[0200] In the step (S20A) of delivering collected fuel based on the ammonia concentration value, the flow path of the collected fuel can be determined by opening and closing the discharge line (400) and the recovery line (500). In the step (S20A) of delivering collected fuel based on the ammonia concentration value, the control unit (700) controls the operation of the control valve unit (CVU) so that the discharge line (400) and the recovery line (500) are opened and closed, thereby allowing the collected fuel to be delivered to either the discharge processing unit (300) or the fuel tank (100).

[0201] Figure 8 is a flowchart illustrating some steps of Figure 7 in detail.

[0202] Referring to FIG. 8, the step of delivering collected fuel based on an ammonia concentration value (S20A) may include a step of determining whether the ammonia concentration value exceeds a preset concentration value (S21A), a step of closing the discharge line and opening the recovery line (S22A), and a step of opening the discharge line and closing the recovery line (S23A).

[0203] In the step of determining whether the ammonia concentration value exceeds a preset concentration value (S21A), it can be determined whether the ammonia concentration value measured in the step of measuring the ammonia concentration value (S10A) exceeds a preset concentration value.

[0204] In the step of determining whether the ammonia concentration value exceeds a preset concentration value (S21A), if it is determined that the measured ammonia concentration value exceeds the preset concentration value, the process may proceed to the step of closing the discharge line and opening the recovery line (S22A).

[0205] In the step (S22A) of closing the discharge line and opening the recovery line, the operation of the control valve unit (CVU) can be controlled. In the step (S22A) of closing the discharge line and opening the recovery line, the operation of the control valve unit (CVU) can be controlled by the control unit (700) so that the discharge line (400) and the recovery line (500) are opened and closed.

[0206] Specifically, in the step (S22A) of closing the discharge line and opening the recovery line, the discharge line (400) may be closed and the recovery line (500) may be opened. By closing the discharge line (400) and opening the recovery line (500), the collected fuel may be transferred to the fuel tank (100). In the step (S22A) of closing the discharge line and opening the recovery line, the direction of fuel flow may be determined so that the collected fuel flows toward the fuel tank (100).

[0207] The step (S22A) of closing the discharge line and opening the recovery line can transfer gaseous fuel with a high ammonia concentration stored inside the collection tank (200) to the fuel tank (100). In other words, the step (S22A) of closing the discharge line and opening the recovery line can transfer gaseous fuel with a high ammonia concentration to the fuel tank (100) and recirculate it within the fuel processing system (10). Thus, the fuel efficiency of the fuel processing system (10) can be improved.

[0208] If, in the step (S21A) of determining whether the ammonia concentration value exceeds a preset concentration value, the measured ammonia concentration value is determined to be less than or equal to the preset value, the process may proceed to the step (S23A) of opening the discharge line and closing the recovery line.

[0209] In the step (S23A) of opening the discharge line and closing the recovery line, the operation of the control valve unit (CVU) can be controlled. In the step (S23A) of opening the discharge line and closing the recovery line, the operation of the control valve unit (CVU) can be controlled by the control unit (700) so that the discharge line (400) and the recovery line (500) are opened and closed.

[0210] Specifically, in the step (S23A) of opening the discharge line and closing the recovery line, the discharge line (400) may be opened and the recovery line (500) may be closed. By opening the discharge line (400) and closing the recovery line (500), the fuel stored inside the collection tank (200) may be transferred to the discharge processing unit (300).

[0211] In the step (S23A) of opening the discharge line and closing the recovery line, the flow direction of the fuel can be determined so that the collected fuel flows toward the discharge processing unit (300).

[0212] The step (S23A) of opening the discharge line and closing the recovery line can transfer gaseous fuel with a low ammonia concentration stored inside the collection tank (200) to the discharge processing unit (300). In other words, the step (S23A) of opening the discharge line and closing the recovery line can transfer gaseous fuel with a low ammonia concentration to the discharge processing unit (300) and discharge it outside the vessel (1). Thus, the amount of harmful substances contained in the fuel discharged from the vessel (1) can be reduced.

[0213] FIG. 9 is a flowchart illustrating a fuel processing method according to another embodiment of the present invention.

[0214] Referring to FIG. 9, a fuel processing method according to another embodiment of the present invention may include the steps of measuring the water level of collected fuel (S10B), calculating the amount of change in the water level (S15B), and delivering the collected fuel based on the amount of change in the water level (S20B).

[0215] In the step of measuring the water level value (S10B), the water level value of the collected fuel stored inside the collection tank (200) can be measured. In the step of measuring the water level value (S10B), the water level value of the liquid fuel among the collected fuel can be measured.

[0216] In the step (S10B) of measuring the water level value, the water level value of the collected fuel can be measured by the sensor unit (600). For example, the water level sensor (620) can measure the water level value of the liquid fuel among the collected fuel.

[0217] In the step of calculating the change in water level value (S15B), the change can be calculated using the water level value of the collected fuel measured in the step of measuring the water level value (S10B). In the step of calculating the change in water level value (S15B), the change in the water level value of the collected fuel per unit time can be calculated using the water level value of the collected fuel measured for a preset time in the step of measuring the water level value (S10B).

[0218] In the step of calculating the amount of change in the water level value (S15B), the amount of change in the water level value can be calculated by the control unit (700). In the step of calculating the amount of change in the water level value (S15B), the amount of change in the water level value can be calculated by the control unit (700) which receives information regarding the water level value of the collected fuel from the sensor unit (600).

[0219] In the step of delivering collected fuel based on the change in water level value (S20B), the flow path of the collected fuel can be determined based on the change in water level value calculated in the step of calculating the change in water level value (S15B).

[0220] In the step (S20B) of delivering collected fuel based on the amount of change in the water level value, the flow path of the collected fuel can be determined by opening and closing the discharge line (400) and the recovery line (500). In the step (S20B) of delivering collected fuel based on the amount of change in the water level value, the control unit (700) controls the operation of the control valve unit (CVU) so that the discharge line (400) and the recovery line (500) are opened and closed, thereby allowing the collected fuel to be delivered to either the discharge processing unit (300) or the fuel tank (100).

[0221] Figure 10 is a flowchart illustrating some steps of Figure 9 in detail.

[0222] Referring to FIG. 10, the step of delivering collected fuel based on the amount of change in the water level value (S20B) may include the step of determining whether the amount of change in the water level value exceeds a preset amount of change (S21B), the step of closing the discharge line and opening the recovery line (S22B), and the step of opening the discharge line and closing the recovery line (S23B).

[0223] In the step (S21B) of determining whether the amount of change in the water level value exceeds a preset amount of change, if it is determined that the amount of change in the calculated water level value exceeds the preset amount of change, the process may proceed to the step (S22B) of closing the discharge line and opening the recovery line.

[0224] In the step (S22B) of closing the discharge line and opening the recovery line, the operation of the control valve unit (CVU) can be controlled. In the step (S22B) of closing the discharge line and opening the recovery line, the operation of the control valve unit (CVU) can be controlled by the control unit (700) so that the discharge line (400) and the recovery line (500) are opened and closed.

[0225] Specifically, in the step (S22B) of closing the discharge line and opening the recovery line, the discharge line (400) may be closed and the recovery line (500) may be opened. By closing the discharge line (400) and opening the recovery line (500), the collected fuel may be transferred to the fuel tank (100). In the step (S22B) of closing the discharge line and opening the recovery line, the direction of fuel flow may be determined so that the collected fuel flows toward the fuel tank (100).

[0226] The step (S22B) of closing the discharge line and opening the recovery line can transfer gaseous fuel with a high ammonia concentration stored inside the collection tank (200) to the fuel tank (100).

[0227] In other words, the step (S22B) of closing the discharge line and opening the recovery line can transfer gaseous fuel with a high ammonia concentration to the fuel tank (100) and recirculate it within the fuel processing system (10). Thus, the fuel efficiency of the fuel processing system (10) can be improved.

[0228] In the step (S21B) of determining whether the amount of change in the water level value exceeds a preset amount of change, if it is determined that the amount of change in the calculated water level value is less than or equal to the preset amount of change, the process may proceed to the step (S23B) of opening the discharge line and closing the recovery line.

[0229] In the step (S23B) of opening the discharge line and closing the recovery line, the operation of the control valve unit (CVU) can be controlled. In the step (S23B) of opening the discharge line and closing the recovery line, the operation of the control valve unit (CVU) can be controlled by the control unit (700) so that the discharge line (400) and the recovery line (500) are opened and closed.

[0230] Specifically, in the step (S23B) of opening the discharge line and closing the recovery line, the discharge line (400) may be opened and the recovery line (500) may be closed. By opening the discharge line (400) and closing the recovery line (500), the fuel stored inside the collection tank (200) may be transferred to the discharge processing unit (300). In the step (S23B) of opening the discharge line and closing the recovery line, the direction of fuel flow may be determined so that the collected fuel flows toward the discharge processing unit (300).

[0231] The step (S23B) of opening the discharge line and closing the recovery line can transfer gaseous fuel having a low ammonia concentration stored inside the collection tank (200) to the discharge processing unit (300).

[0232] In other words, the step (S23B) of opening the discharge line and closing the recovery line can transfer gaseous fuel having a low ammonia concentration to the discharge treatment unit (300) and discharge it outside the vessel (1). Thus, the amount of harmful substances contained in the fuel discharged from the vessel (1) can be reduced.

[0233] The fuel processing method according to the embodiments of the present invention can reduce harmful substances discharged to the outside of the ship and improve fuel efficiency by varying the configuration of the delivery of collected fuel according to the state of the collected fuel stored inside the collection tank.

[0234] The fuel processing method according to the embodiments of the present invention can transfer fuel to either a discharge processing unit or a fuel tank depending on the condition of the collected fuel inside the collection tank. Thus, the concentration of harmful substances discharged outside the vessel can be reduced, and fuel efficiency can be improved.

[0235] The scope of the present invention is not limited to the embodiments described above, and all scopes equivalent to or equivalently modified from the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention.

[0236] The fuel processing system and fuel processing method according to an embodiment of the present invention can be applied to various types of vessels using fuel.

Claims

1. Fuel tank that supplies fuel to the engine; A collection tank that receives surplus fuel recovered from the above engine; A discharge processing unit that receives fuel from the above collection tank; A discharge line connecting the above collection tank and the above discharge processing unit; A recovery line connecting the fuel tank and the collection tank; and A fuel processing system comprising: a control valve unit that determines the flow path of collected fuel stored in the collection tank to the discharge line or the recovery line.

2. In Paragraph 1, A fuel processing system further comprising: a control unit that controls the operation of the control valve unit to open or close the flow path of the collected fuel to the discharge line or the recovery line.

3. In Paragraph 2, The above control valve unit includes a discharge control valve disposed on the discharge line; and a recovery control valve disposed on the recovery line. The above control unit controls the operation of the discharge control valve and the recovery control valve, in a fuel processing system.

4. In Paragraph 3, A fuel processing system in which the above control unit controls the operation of the control valve unit so that either the discharge line or the recovery line is opened.

5. In Paragraph 2, A fuel processing system further comprising a sensor unit for acquiring information on the collected fuel.

6. In Paragraph 5, The above sensor unit measures the ammonia concentration value of the collected fuel, a fuel processing system.

7. In Paragraph 6, A fuel processing system in which the above-mentioned control unit controls the operation of the above-mentioned valve unit based on the above-mentioned ammonia concentration value.

8. In Paragraph 5, The above sensor unit measures the level value of the collected fuel, a fuel processing system 9. In Paragraph 8, A fuel processing system in which the above-mentioned control unit controls the operation of the above-mentioned valve unit based on the above-mentioned water level value.

10. A step of measuring information of collected fuel stored in a collection tank that receives surplus fuel recovered from the engine; and A fuel processing method comprising the step of transferring the collected fuel to a discharge processing unit or a fuel tank based on information of the collected fuel.

11. In Paragraph 10, A fuel processing method in which the step of delivering the collected fuel determines a flow path to a discharge line connecting the collection tank and the discharge processing unit or to a recovery line connecting the collection tank and the fuel tank.

12. In Paragraph 11, A fuel processing method in which the step of delivering the collected fuel opens and closes a flow path to the discharge line or the recovery line.

13. In Paragraph 10, The step of delivering the collected fuel controls the operation of a discharge control valve placed on the discharge line and a recovery control valve placed on the recovery line, in a fuel processing system.

14. In Paragraph 10, The step of measuring information of the collected fuel is to measure the ammonia concentration value of the collected fuel, a fuel processing method.

15. In Paragraph 10, The step of measuring information of the collected fuel is a fuel processing method that measures the level value of the collected fuel.

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