Liquid fuel treatment system and ship including same

Abstract

A liquid fuel treatment system according to the present invention comprises: a plurality of holds provided along the longitudinal direction of a hull; a partition wall that divides the inner space of at least one of the holds into a plurality of separate spaces in the left-right direction; and a separation unit that partitions the separate spaces into a plurality of fuel spaces and has a structure that can be opened and closed. The separation unit is opened when a first fuel having a different boiling point than a second fuel is stored in the separate spaces, and closed when the second fuel is stored in the separate spaces.

Description

Liquid fuel processing system and vessel including same

[0001] The present invention relates to a liquid fuel processing system and a vessel including the same.

[0002] Nitrogen oxides (NO) contained in exhaust gases emitted from ships are subject to recent international agreements. x ), sulfur oxides (SO x ), carbon dioxide (CO2), and other emissions are regulated, and these regulations are being strengthened every year.

[0003] Liquefied natural gas (LNG) is being used as an environmentally friendly fuel as a response to exhaust gas regulations because it does not contain sulfur and produces less carbon dioxide.

[0004] However, since liquefied natural gas is difficult to liquefy through pressurization alone and requires maintaining an extremely low temperature of approximately -165℃ for liquefaction, fuel tanks and fuel supply systems need to be constructed of special materials that can withstand extremely low temperatures. In addition, additional equipment may be required to dissipate the heat of the liquefied natural gas, resulting in additional equipment costs for constructing fuel tanks, etc. In addition, since it is difficult to completely block the heat that penetrates the tank, the liquefied natural gas may evaporate due to the infiltrating heat, which may deteriorate fuel efficiency due to the evaporative gas generated at this time.

[0005] Instead of liquefied natural gas, methanol (CH3OH) can be used as a ship fuel. Liquid fuel is easy to handle because it remains liquid at room temperature. Furthermore, it contains no sulfur and has a low carbon content, reducing carbon dioxide emissions during combustion. Accordingly, research is being conducted to efficiently utilize liquid fuel as a ship fuel.

[0006] The present invention was created to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a liquid fuel processing system capable of reducing the amount of sulfur oxides and carbon dioxide emissions in exhaust gas by using liquid fuel as fuel, and a ship including the same.

[0007] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned can be clearly understood by a person of ordinary skill in the art from the description below.

[0008] A liquid fuel processing system according to one aspect of the present invention comprises: a plurality of holds provided along a longitudinal direction of a hull; a bulkhead dividing an internal space of at least one of the holds into a plurality of separation spaces along a left-right direction; and a separation unit having an openable and closable structure that divides the separation spaces into a plurality of fuel spaces, wherein the separation unit is opened when the first fuel among first and second fuels having different boiling points is stored in the separation space, and is closed when the second fuel is stored in the separation space.

[0009] Specifically, the separation unit may be opened when a first fuel having a relatively low boiling point is stored in the separation space, and may be closed when a second fuel having a relatively high boiling point is stored in the separation space, so that the volume of the fuel space in which the second fuel is stored may be less than a preset value.

[0010] Specifically, when a second fuel having a relatively high boiling point is stored in the separation space, at least a portion of the fuel space in which the second fuel is stored can be maintained as an empty space.

[0011] Specifically, it may include a hold wall that divides the internal space of the hold in the front-back direction; and an outer tank arranged on the left and right sides of an area provided at the rear of the internal space of the hold.

[0012] Specifically, it may further include a loading section provided between a pair of outer tanks and in which a container is loaded.

[0013] Specifically, it may further include a connecting portion that opens at least a portion of the separating portion to connect the fuel spaces to each other.

[0014] A liquid fuel processing system according to one aspect of the present invention includes a fuel supply unit for supplying liquid fuel from a fuel tank to a demander; a first transfer valve disposed outside the fuel tank and controlling the supply of the liquid fuel; and a valve room for accommodating the first transfer valve and forming an isolated space.

[0015] Specifically, the valve room is provided in a form that completely seals the inside and outside, and can maintain the pressure of the fuel tank above a preset pressure.

[0016] Specifically, it may further include a ventilation unit installed to ventilate the interior of the valve room.

[0017] Specifically, the valve room is provided in a form that partially seals the inside and outside, and may further include a leak treatment line for collecting fuel leaked from the valve room.

[0018] A liquid fuel processing system according to one aspect of the present invention comprises: a fuel tank storing liquid fuel of one of first fuel and second fuel having different boiling points; a cleaning unit supplying a cleaning medium to the fuel tank; and a collection tank collecting wastewater generated from a hull; wherein the collection tank stores liquid fuel discharged from the fuel tank together with the cleaning medium.

[0019] Specifically, the cleaning unit can supply a cleaning medium to the fuel tank before replacing the first fuel or the second fuel of the fuel tank with a liquid fuel having a different boiling point or before injecting the liquid fuel into the fuel tank.

[0020] Specifically, the system may further include a control unit that discharges the liquid fuel to the outside together with the cleaning medium when the concentration of the liquid fuel in the collection tank is below a preset value.

[0021] Specifically, the cleaning unit can supply a cleaning medium to the fuel tank using a feed pump provided at the rear of the hull.

[0022] Specifically, the collection tank may include a first collection tank that collects liquid fuel discharged from the fuel tank together with a cleaning medium; and a second collection tank that is isolated from the first collection tank by a bulkhead and collects the cleaning medium separated from the liquid fuel due to a density difference.

[0023] A vessel according to one aspect of the present invention may include the liquid fuel processing system.

[0024] The liquid fuel processing system of the present invention and the vessel including the same have the following effects.

[0025] A liquid fuel processing system according to the present invention and a ship including the same can reduce the amount of sulfur oxides and carbon dioxide emitted from exhaust gas by using liquid fuel as fuel.

[0026] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0027] FIG. 1 is a drawing for explaining a vessel according to a first embodiment of the present invention.

[0028] FIG. 2 is a first conceptual diagram for explaining a liquid fuel processing system according to a first embodiment of the present invention.

[0029] FIG. 3 is a second conceptual diagram for explaining a liquid fuel processing system according to the first embodiment of the present invention.

[0030] FIG. 4 is a drawing for explaining a fuel supply tank according to the first embodiment of the present invention.

[0031] FIG. 5 is a drawing for explaining a fuel supply tank according to a second embodiment of the present invention.

[0032] FIG. 6 is a first conceptual diagram for explaining a liquid fuel processing system according to a third embodiment of the present invention.

[0033] Figure 7 is a second conceptual diagram for explaining a liquid fuel processing system according to a third embodiment of the present invention.

[0034] Figure 8 is a first conceptual diagram for explaining a liquid fuel processing system according to a fourth embodiment of the present invention.

[0035] FIG. 9 is a second conceptual diagram for explaining a liquid fuel processing system according to a fourth embodiment of the present invention.

[0036] FIG. 10 is a first conceptual diagram for explaining a liquid fuel processing system according to a fifth embodiment of the present invention.

[0037] FIG. 11 is a second conceptual diagram for explaining a liquid fuel processing system according to the fifth embodiment of the present invention.

[0038] Figure 12 is a conceptual diagram for explaining a liquid fuel processing system according to the sixth embodiment of the present invention.

[0039] Figure 13 is a conceptual diagram for explaining a liquid fuel processing system according to the seventh embodiment of the present invention.

[0040] Figure 14 is a conceptual diagram for explaining a liquid fuel processing system according to the eighth embodiment of the present invention.

[0041] FIG. 15 is a cross-sectional view taken along portion “A” to explain the liquid fuel processing system illustrated in FIG. 14.

[0042] Figure 16 is a conceptual diagram for explaining a liquid fuel processing system according to the ninth embodiment of the present invention.

[0043] Figure 17 is a conceptual diagram for explaining a liquid fuel processing system according to the tenth embodiment of the present invention.

[0044] FIG. 18 is a first conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0045] FIG. 19 is a second conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0046] FIG. 20 is a third conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0047] FIG. 21 is a first conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0048] FIG. 22 is a second conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0049] FIG. 23 is a third conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0050] FIG. 24 is a fourth conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0051] FIG. 25 is a fifth conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0052] Figure 26 is a conceptual diagram for explaining a liquid fuel processing system according to the 13th embodiment of the present invention.

[0053] Figure 27 is a conceptual diagram for explaining a liquid fuel processing system according to the 14th embodiment of the present invention.

[0054] Figure 28 is a conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 15th embodiment of the present invention.

[0055] Figure 29 is an enlarged view of part “A” to explain the hold of the vessel shown in Figure 28.

[0056] Fig. 30 is a cross-sectional view taken along the “B” portion to explain the first region of the hold illustrated in Fig. 29.

[0057] Fig. 31 is a cross-sectional view taken along the “C” portion to explain the second region of the hold illustrated in Fig. 29.

[0058] Figure 32 is an enlarged view of the “D” portion to explain the hold of the vessel shown in Figure 28.

[0059] Figure 33 is a first conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 16th embodiment of the present invention.

[0060] Figure 34 is a second conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 16th embodiment of the present invention.

[0061] FIG. 35 is a third conceptual diagram of a vessel for explaining a cleaning section of a liquid fuel processing system according to the 16th embodiment of the present invention.

[0062] Figure 36 is a first conceptual diagram of a cleaning unit of a liquid fuel processing system according to one embodiment of the present invention.

[0063] Figure 37 is a second conceptual diagram of a cleaning unit of a liquid fuel processing system according to one embodiment of the present invention.

[0064] Figure 38 is a conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 17th embodiment of the present invention.

[0065] The purpose, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments, taken in conjunction with the accompanying drawings. In this specification, when reference numerals are assigned to components in each drawing, it should be noted that, where possible, identical components are assigned the same reference numerals even if they appear in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known technology is deemed to unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0066] In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0067] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

[0068] Additionally, it should be noted that terms indicating direction such as front, back, left, right, vertical, and horizontal are defined based on a ship consisting of the bow, stern, sides (port and starboard), upper deck, and bottom.

[0069] In addition, it is clarified that the term "ship" in this specification includes not only a merchant ship that transports cargo from the point of departure to the destination, but also a marine structure that floats at a certain point in the sea and performs a specific task.

[0070] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0071]

[0072] FIG. 1 is a drawing for explaining a vessel according to a first embodiment of the present invention.

[0073] Referring to FIG. 1, a ship (1) may include a fuel tank (2) for storing liquid fuel, and a fuel supply unit (3) for supplying liquid fuel delivered from the fuel tank (2) as fuel to a demander (14).

[0074] In this embodiment, the term "vessel (1)" may be used to encompass all vessels that propel themselves with liquid fuel. For example, if the vessel (1) is a crude oil carrier, a crude oil storage tank may be provided within the hull (11), and if the vessel (1) is a container vessel, a container may be loaded within the hull (11). Hereinafter, the case where the vessel (1) is a crude oil carrier will be described as an example. However, the vessel (1) of the present invention is not limited to a crude oil carrier, and may encompass a vessel that carries liquid fuels such as methanol.

[0075] A vessel (1) may include a liquid fuel processing system (10) that processes liquid fuel. The liquid fuel processing system (10) may process liquid fuel supplied to a demand source (14), liquid fuel stored in a fuel tank (2), liquid fuel recovered from a demand source (14), or liquid fuel leaked from a device provided on the vessel (1). In addition, the liquid fuel processing system (10) may process liquid fuel to supply it to a demand source (14), but the present invention is not limited thereto.

[0076] A ship (1) equipped with a fuel tank (2) and a fuel supply unit (3) may include a hull (11), a cargo tank (12), an engine room (13), and a demand source (14). The ship (1) may include various other components in addition to the above-described components, and in this embodiment, only the components necessary for the present invention will be described.

[0077] The hull (11) is composed of an upper deck (111), a side shell (112), a bottom plate (113), a bow (114), and a stern (115) to form the exterior of the ship (1). Hereinafter, the bow (114) and the stern (115) may represent a front area of ​​the hull (11) and a rear area of ​​the hull (11).

[0078] The fuel tank (2) can store liquid fuel supplied to a demander (14). The fuel tank (2) may include a fuel storage tank (21) that receives and stores liquid fuel from the outside and a fuel supply tank (22) that receives liquid fuel from the fuel storage tank (21) and supplies it to the demander (14). At least one of the fuel storage tank (21) and the fuel supply tank (22) may be provided in the hull (11). In the present specification, the fuel tank (2) may be used in the sense of a fuel storage tank (21) or a fuel supply tank (22). The fuel storage tank (21) and the fuel supply tank (22) may be used interchangeably.

[0079] The fuel storage tank (21) can store liquid fuel. The fuel storage tank (21) can supply the stored liquid fuel to the fuel supply tank (22) or a demand source (14), and the fuel supply tank (22) can receive and store liquid fuel from the fuel storage tank (21) or from the outside.

[0080] The fuel tank (2) may be provided on the upper deck (111) and may be provided inside the hull (11). Specifically, the fuel storage tank (21) may be provided inside the hull (11), and the fuel supply tank (22) may be provided on the upper deck (111), but the present invention is not limited thereto.

[0081] A plurality of cargo tanks (12) are arranged longitudinally within the hull (11) and can store crude oil. The cargo tanks (12) are provided with internal bulkheads, and can be separated into a plurality of spaces by the bulkheads. However, the present invention is not limited thereto. The cargo tanks (12) can include liquid fuel storage tanks such as methanol storage tanks, and liquefied gas storage tanks such as liquefied natural gas storage tanks. Of course, containers can be loaded on the hull (11) instead of the cargo tanks (12).

[0082] The engine room (13) is placed at the stern (115) of the hull (11), and can accommodate a demand source (14) that uses liquid fuel as fuel.

[0083] The demand source (14) may be provided in the engine room (13) and may be operated by receiving liquid fuel stored in the fuel tank (2) through the fuel supply unit (3). In this embodiment, the demand source (14) is not limited to being provided in the engine room (13), but may be provided in various locations and may encompass various demand sources that operate using liquid fuel as fuel.

[0084] For example, the demand source (14) may refer to a device such as a propulsion engine or a power generation engine installed for propulsion or power generation of a ship (1). The demand source (14) may include, for example, a MELGI engine, an XDF-M engine, a DF engine included in a DFDE, a DF power generation engine, a DF boiler engine, a turbine engine, etc.

[0085] The demand source (14) may include a first demand source (141) that operates at high pressure, such as a propulsion engine, and a second demand source (142) that operates at low pressure, such as a power generation engine.

[0086] Figure 2 is a first conceptual diagram for explaining a liquid fuel processing system (10) according to the first embodiment of the present invention.

[0087] As illustrated in FIG. 2, in the liquid fuel processing system (10) according to the first embodiment of the present invention, the first demand source (141) may be connected to the fuel tank (2) and a high-pressure fuel supply line (L11), and may be operated using high-pressure liquid fuel delivered from the high-pressure fuel supply unit (311) of the first fuel supply unit (31). The second demand source (142) may be connected to the fuel tank (2) and a low-pressure fuel supply line (L12), and may be operated using low-pressure liquid fuel delivered from the low-pressure fuel supply unit (312) of the first fuel supply unit (31).

[0088] The first demand source (141) can be connected to the high-pressure fuel supply unit (311) in one or more in parallel, and the second demand source (142) can be connected to the low-pressure fuel supply unit (312) in one or more in parallel.

[0089] The first demand source (141) or the second demand source (142) may be placed at a relatively low location in order to maintain the pressure of the liquid fuel supplied from the fuel tank (2) above a certain level. In this case, when the first demand source (141) or the second demand source (142) is placed at a relatively low location, a hammering phenomenon may occur in the high-pressure fuel supply line (L11) or the low-pressure fuel supply line (L12) when the liquid fuel is filled in the high-pressure fuel supply line (L11) or the low-pressure fuel supply line (L12).

[0090] If air or gas is present in the high-pressure fuel supply line (L11) or the low-pressure fuel supply line (L12), the hammering phenomenon may occur more strongly. If liquid fuel and air are supplied together to the first demand source (141) or the second demand source (142), the fuel efficiency of the first demand source (141) or the second demand source (142) may decrease, and the function of the first demand source (141) or the second demand source (142) may be damaged.

[0091] Therefore, the first demand source (141) or the second demand source (142) should be placed at a relatively low height, but in order to prevent the hammering phenomenon from occurring strongly, air or the like should not move along the high-pressure fuel supply line (L11) or the low-pressure fuel supply line (L12).

[0092] Accordingly, a liquid fuel processing system (10) according to one embodiment of the present invention includes a discharge means for removing air or gas, such as a degassing tank (DT), a first degassing line (DL1), and a second degassing line (DL2), which will be described later, so as to be able to remove air or gas existing in a high-pressure fuel supply line (L11) or a low-pressure fuel supply line (L12).

[0093] The fuel tank (2) can store liquid fuel and supply the stored liquid fuel to a demander (14) through a fuel supply unit (3). The fuel tank (2) can include a fuel storage tank (21) that stores and retains liquid fuel, and a fuel supply tank (22) that delivers the liquid fuel supplied from the fuel storage tank (21) to the fuel supply unit (3).

[0094] The liquid fuel processing system (10) may include a transfer pump (P) that pressurizes liquid fuel stored in a fuel storage tank (21) and supplies it to a fuel supply tank (22), a fuel supply line (L1) that connects between the transfer pump (P) and the fuel supply tank (22) and supplies the liquid fuel discharged from the transfer pump (P) to the fuel supply tank (22), and a fuel return line (L2) that connects between the fuel supply tank (22) and the fuel storage tank (21) and returns the liquid fuel stored in the fuel supply tank (22) to the fuel storage tank (21). The fuel supply line (L1) may include a high-pressure fuel supply line (L11) and a low-pressure fuel supply line (L12). The fuel supply line (L1) may connect a fuel tank (2) to a demand source (14). The fuel supply line (L1) may include a line connecting the fuel storage tank (21) to the fuel supply tank (22).

[0095] In this embodiment, the fuel tank (2) is described as including a fuel storage tank (21) and a fuel supply tank (22), but the fuel supply tank (22) may be omitted. In this case, the fuel storage tank (21) may be configured to directly transfer liquid fuel to the fuel supply unit (3). That is, the fuel storage tank (21) may have both a liquid fuel storage function and a fuel supply function.

[0096] The fuel tank (2) may be installed at a location exposed to the outside of the hull (11). At this time, the fuel tank (2) may be a fuel supply tank (22) installed on the upper deck (111) as shown in Fig. 1, or a fuel storage tank (21) installed below the upper deck (111).

[0097] The fuel storage tank (21) can be provided outside the hull (11) or inside the hull (11).

[0098] The fuel storage tanks (21) may be arranged one on each side of the hull (11) on the upper deck (111), but are not limited thereto.

[0099] The fuel supply unit (3) can supply liquid fuel from the fuel tank (2) to the demander (14). The fuel supply unit (3) may include a first fuel supply unit (31) that pressurizes and heats the liquid fuel supplied from the fuel tank (2) to a pressure and temperature required by the demander (14) and supplies it to the demander (14), a second fuel supply unit (32) that opens when the liquid fuel supplied from the first fuel supply unit (31) reaches the pressure required by the demander (14), an inert gas supply unit (33) that purges the fuel tank (2), the fuel supply unit (3), etc., and a vent mast (34) that discharges gases existing in the fuel tank (2), the fuel supply unit (3), etc. to the outside.

[0100] The first fuel supply unit (31) can receive liquid fuel from the fuel tank (2), pressurize it to an appropriate pressure required by the demander (14), and heat it to an appropriate temperature. This first fuel supply unit (31) may be a low-flashpoint fuel supply system (LFSS).

[0101] When the demand source (14) is composed of a first demand source (141) that operates at high pressure, such as a propulsion engine, and a second demand source (142) that operates at low pressure, such as a power generation engine, the first fuel supply unit (31) may include a high-pressure fuel supply unit (311) provided on a high-pressure fuel supply line (L11) that connects the fuel tank (2) and the first demand source (141), and a low-pressure fuel supply unit (312) provided on a low-pressure fuel supply line (L12) that connects the fuel tank (2) and the second demand source (142).

[0102] The high-pressure fuel supply unit (311) can receive liquid fuel from the fuel tank (2), pressurize it to an appropriate pressure required by the first demand source (141), and heat it to an appropriate temperature.

[0103] The high-pressure fuel supply unit (311) may include a 1-1 pump (P11), a 1-1 heat exchanger (HE11), a 1-1 pressure regulating valve (PCV11), a 1-1 degassing line (DL1), a degassing tank (DT), a 1-2 pump (P12), a 1-2 heat exchanger (HE12), a 1-2 pressure regulating valve (PCV12), and a 1-2 filter (F1).

[0104] The 1-1 pump (P11) is installed on the high-pressure fuel supply line (L11) and can pressurize the liquid fuel supplied from the fuel tank (2) to an appropriate pressure required by the degassing tank (DT) and supply it to the 1-1 heat exchanger (HE11).

[0105] In this embodiment, the first-first pump (P11) may be a magnetic pump (Magnetic Drive Pump). The magnetic pump (MP) has an external magnet attached to the motor rotation part and an internal magnet attached to the pump rotation part, so that when the motor rotates, the pump rotation part can rotate and be operated by the rotational force of the motor and the magnetic force of the magnet. The external magnet provided in the motor rotation part of the pump and the internal magnet provided in the pump rotation part can be designed to have different poles, and a magnetic force can be formed between the external magnet and the internal magnet.

[0106] Typical fluid transfer pumps employ mechanical seals. Mechanical seals utilize springs and carbon packing to seal the pump's rotating parts, preventing fluid from leaking. Mechanical seals create contact surfaces within the pump, and friction generated at these contact surfaces can cause wear on the packing, which can then lead to fluid leakage.

[0107] Since the motor rotating part and the pump rotating part can be separated from each other by a diaphragm, structural sealing such as packing is not applied to moving parts such as the pump rotating part, thereby preventing fluid leakage due to wear of packing, etc.

[0108] The 1-1 heat exchanger (HE11) is installed on the high-pressure fuel supply line (L11) and can primarily heat the liquid fuel supplied from the 1-1 pump (P11) and transfer it to the degassing tank (DT). If the 1-1 heat exchanger (HE11) is installed as described later, it can be installed on the 1-1 return line (RL1).

[0109] The 1-1 heat exchanger (HE11) may include a configuration for discharging air or gas to the outside in order to remove air or gas within the high-pressure fuel supply line (L11). For example, if the 1-1 heat exchanger (HE11) is of the shell and tube type, air or gas may be collected at the upper part of the shell body, and if the 1-1 heat exchanger (HE11) is of the shell and plate type, air or gas may be collected at the upper part of the shell body or the discharge nozzle of the plate. In this way, air or gas may be collected in a certain area of ​​the 1-1 heat exchanger (HE11) and discharged to the outside.

[0110] The 1-1 pressure regulating valve (PCV11) may be provided on the 1st return line (RL1) through which liquid fuel is returned from the downstream of the 1-1 heat exchanger (HE11) to the upstream of the 1-1 pump (P11), and may be adjusted to an open state when the upstream high-pressure fuel supply line (L11) of the 1-1 pump (P11) is not filled with liquid fuel, and may be adjusted to a closed state when the upstream high-pressure fuel supply line (L11) of the 1-1 pump (P11) is filled with liquid fuel.

[0111] The first degassing line (DL1) may be arranged to branch off from the first return line (RL1) upstream of the first-1 pressure regulating valve (PCV11). The first degassing line (DL1) may degas the gas of the liquid fuel before it is supplied to the degassing tank (DT) via the first-1 heat exchanger (HE11).

[0112] Gases such as air existing in the high-pressure fuel supply line (L11) can move along the first degassing line (DL1) and be collected in the degassing header (not shown).

[0113] An on / off valve (not shown) may be installed in the first degassing line (DL1). If only the on / off valve is installed in the first degassing line (DL1), a large amount of liquid together with gas may be discharged into the first degassing line (DL1) due to the pressure difference between the first degassing line (DL1) and the high-pressure fuel supply line (L11) to which the first return line (RL1) is connected. Accordingly, the pressure of the high-pressure fuel supply line (L11) may drop rapidly. To prevent the pressure of the high-pressure fuel supply line (L11) from dropping rapidly, a control valve (not shown) may be further installed on the first degassing line (DL1). The control valve may allow the degassing to proceed slowly.

[0114] In the above, during the initial operation of the high-pressure fuel supply unit (311), the liquid fuel may not be completely filled in the high-pressure fuel supply line (L11) upstream of the 1-1 pump (P11) or may be supplied to the 1-1 pump (P11) while the liquid fuel contains gas. In this case, the net positive suction head (NPSHr) of the 1-1 pump (P11) may not be correct, which may cause a problem of cavitation.

[0115] In this embodiment, the above problem is solved by providing a first-first pressure regulating valve (PCV11) and a first degassing line (DL1) in the first return line (RL1), and air or gas contained in the initially supplied liquid fuel is removed, and the liquid fuel is circulated through the first return line (RL1) until the liquid fuel is filled in the high-pressure fuel supply line (L11) upstream of the first-first pump (P11), and then the liquid fuel is supplied to the degassing tank (DT).

[0116] The degassing tank (DT) is provided on the high-pressure fuel supply line (L11) and can remove air or gas contained in the liquid fuel supplied from the 1-1 heat exchanger (HE11) and supply it to the 1-2 pump (P12).

[0117] Air or gas contained in the liquid fuel supplied to the degassing tank (DT) was removed through the first degassing line (DL1) mentioned above, but it cannot be considered to have been completely removed, and therefore, in this embodiment, the degassing tank (DT) was provided upstream of the 1-2 pump (P12).

[0118] The degassing tank (DT) can be configured to discharge air or gas collected at the top to the outside and transfer liquid collected at the bottom to the first-second pump (P12).

[0119] The degassing tank (DT) may be equipped with a device capable of removing air or gas, and may also be equipped with a device capable of controlling the operation of the first and second pumps (P12) according to the level of liquid fuel filled inside.

[0120] That is, the degassing tank (DT) is equipped with multiple level switches for each height to measure the level of the liquid fuel, and when the level of the liquid fuel falls below a certain level, the operation of the 1st-2nd pump (P12) can be stopped.

[0121] For example, a degassing tank (DT) may be provided with a low level switch and a high level switch. The low level switch may be installed at the lowest water level of the degassing tank (DT). The lowest water level of the degassing tank (DT) may be designed to be higher than a height at which the impeller of the first-second pump (P12) can be completely immersed in the liquid fuel. The high level switch may be installed at a height at which the capacity that the first-second pump (P12) can discharge for 1 minute and the volume of the degassing tank (DT) become equal. In the above, the low level switch provided in the degassing tank (DT) can be used to check whether the impeller of the first-second pump (P12) is immersed in the liquid fuel, and if the impeller of the first-second pump (P12) is not immersed in the liquid fuel, the first-second pump (P12) may not be operated.

[0122] The degassing tank (DT) can be omitted. This is because, in the case of liquid fuel, there are no problems such as vaporization due to fuel heating.

[0123] The 1-2 pump (P12) is installed on the high-pressure fuel supply line (L11) and can pressurize the liquid fuel supplied from the degassing tank (DT) to an appropriate pressure required by the first demand source (141) and supply it to the 1-2 heat exchanger (HE12).

[0124] In this embodiment, the 1-2 pump (P12) may be a magnetic pump (Magnetic Drive Pump) identical to or similar to the 1-1 pump (P11) described above.

[0125] In this embodiment, the 1-2 pump (P12) can be deleted, and only the 1-1 pump (P11) can be applied. At this time, the 1-1 pump (P11) can be configured to perform the function of the 1-2 pump (P12). However, due to the maximum flow rate limit of the available pumps, the 1-1 pump (P11) can be connected in parallel and applied according to the required flow rate of the first demand source (141), and the flow rate ratio of the 1-1 pump (P11) is set to 1.3 times the required flow rate of the first demand source (141).

[0126] The 1-2 heat exchanger (HE12) is installed on the high-pressure fuel supply line (L11) and can secondarily heat the liquid fuel supplied from the 1-2 pump (P12) to an appropriate temperature required by the first demand source (141).

[0127] The first-second heat exchanger (HE12) may include a configuration for discharging air or gas to the outside in order to remove air or gas within the high-pressure fuel supply line (L11). For example, if the first-second heat exchanger (HE12) is of the shell-and-tube type, air or gas may be collected at the upper portion of the shell body, and if the first-first heat exchanger (HE11) is of the shell-and-plate type, air or gas may be collected at the upper portion of the shell body or at the discharge nozzle of the plate. In this way, air or gas may be collected in a certain area of ​​the first-second heat exchanger (HE12) and discharged to the outside.

[0128] In this embodiment, the first-second heat exchanger (HE12) can be deleted, and only the first-first heat exchanger (HE11) can be applied. In this case, the first-first heat exchanger (HE11) can be configured to perform the function of the first-second heat exchanger (HE12).

[0129] The 1-2 pressure regulating valve (PCV12) may be provided on a return line (not shown in the drawing) through which liquid fuel is returned to the degassing tank (DT) downstream of the 1-2 heat exchanger (HE12), and may be opened when the pressure of the liquid fuel discharged from the 1-2 pump (P12) is higher than the pressure required by the demander.

[0130] The first filter (F1) is provided on the high-pressure fuel supply line (L11) and can remove foreign substances contained in the liquid fuel supplied from the first-second heat exchanger (HE12) and supply it to the first demand source (141).

[0131] The low-pressure fuel supply unit (312) can receive liquid fuel from the fuel tank (2), pressurize it to an appropriate pressure required by the second demand source (142), and heat it to an appropriate temperature.

[0132] The low-pressure fuel supply unit (312) may include a second pump (P2), a second heat exchanger (HE2), a second pressure regulating valve (PCV2), a second degassing line (DL2), and a second filter (F2).

[0133] The second pump (P2) is installed on the low-pressure fuel supply line (L12) and can pressurize the liquid fuel supplied from the fuel tank (2) to an appropriate pressure required by the second demand source (142) and supply it to the second heat exchanger (HE2).

[0134] In this embodiment, the second pump (P2) may be a magnetic pump (Magnetic Drive Pump) identical to or similar to the first-first pump (P11) described above.

[0135] The second heat exchanger (HE2) is installed on the low-pressure fuel supply line (L12) and can heat the liquid fuel supplied from the second pump (P2) to an appropriate temperature required by the second demand source (142).

[0136] The second heat exchanger (HE2) may include a configuration that discharges air or gas to the outside in order to remove air or gas within the low-pressure fuel supply line (L12). For example, if the second heat exchanger (HE2) is of the shell and tube type, air or gas may be collected at the upper part of the shell body, and if the second heat exchanger (HE2) is of the shell and plate type, air or gas may be collected at the upper part of the shell body or the discharge nozzle of the plate. In this way, air or gas may be collected in a certain area of ​​the second heat exchanger (HE2) and discharged to the outside.

[0137] In order to remove air or gas within the low-pressure fuel supply line (L12), the second heat exchanger (HE2) may include a configuration for discharging air or the like to the outside.

[0138] The second pressure regulating valve (PCV2) may be provided on the second return line (RL2) through which liquid fuel is returned from the downstream of the second heat exchanger (HE2) to the upstream of the second pump (P2), and may be adjusted to an open state when the low-pressure fuel supply line (L12) on the upstream side of the second pump (P2) is not filled with liquid fuel, and may be adjusted to a closed state when the low-pressure fuel supply line (L12) on the upstream side of the second pump (P2) is filled with liquid fuel.

[0139] The second degassing line (DL2) may be provided to branch off from the second return line (RL2) upstream of the second pressure regulating valve (PCV2). The second degassing line (DL2) may degas the gas within the liquid fuel before it is supplied to the second demand source (142) via the second heat exchanger (HE2). The second degassing line (DL2) may be configured similarly to the first degassing line (DL1) described above.

[0140] The second filter (F2) is provided on the low-pressure fuel supply line (L12) and can remove foreign substances contained in the liquid fuel supplied from the second heat exchanger (HE2) and supply it to the second demand source (142).

[0141] As described above, the present embodiment may be provided with a first return line (RL1) through which liquid fuel is returned from downstream of the 1-1 pump (P11) to upstream of the 1-1 pump (P11), and a second return line (RL2) through which liquid fuel is returned from downstream of the 2nd pump (P2) to upstream of the 2nd pump (P2). The return lines (RL1, RL2) may be provided with pressure regulating valves (PCV11, PCV2), and since the pressure regulating valves (PCV11, PCV2) are open, the upstream of the 1-1 pump (P11) or the 2nd pump (P2) may be filled with methanol.

[0142] A return line may be provided to return liquid fuel from the downstream of the No. 1-2 pump (P12) to the upstream of the No. 1-2 pump (P12), and a pressure regulating valve (PCV12) may be provided in the return line.

[0143] A level switch is provided in front of the No. 1-1 pump (P11) or the No. 2 pump (P2) to check whether the No. 1-1 pump (P11), the No. 2 pump (P2) and the return lines (RL1, RL2) are filled with liquid fuel. If it is determined that the No. 1-1 pump (P11) or the No. 2 pump (P2) and the return lines (RL1, RL2) are filled with liquid fuel, the No. 1-1 pump (P11) or the No. 2 pump (P2) can be operated.

[0144] A degassing tank (DT) may be installed in front of the No. 1-2 pump (P12) to discharge air, etc., from the fuel supply lines (L11, L12). The water level of the drum may be controlled so that the impeller of the No. 1-2 pump (P12) is immersed in methanol. When the No. 1-2 pump (P12) is determined to be filled by a level switch installed in the degassing tank (DT), the No. 1-2 pump (P12) may be operated.

[0145] In addition, in the present embodiment, the fuel tank (2) can be installed at a higher position than the No. 1-1 pump (P11) so that the impeller of the No. 1-1 pump (P11) is immersed in methanol. It is preferable that the fuel tank (2) be designed to be located approximately 3.3 m above the No. 1-1 pump (P11). Of course, the fuel tank (2) can be designed to be located above the No. 2 pump (P2).

[0146] The fuel tank (2) is positioned above the 1-1 pump (P11) so that liquid fuel can fill the 1-1 pump (P11) and the 2nd pump (P2). A level switch may be provided at the front end of the 1-1 pump (P11) and the 2nd pump (P2), and it is possible to check whether the 1-1 pump (P11) and the 2nd pump (P2) are filled with liquid fuel through the level switch.

[0147] A second fuel supply unit (32) may be provided between the first fuel supply unit (31) and the demand unit (14) to fill the demand unit (14) with liquid fuel.

[0148] The second fuel supply unit (32) can effectively cut off the fuel supply by separating the first fuel supply unit (31) and the demand unit (14) when the first fuel supply unit (31) operates abnormally. The second fuel supply unit (32) can be composed of valves for double blocking and discharge, venting, pressure control, nitrogen supply, etc., filters, various sensors, etc. This second fuel supply unit (32) is a mechanism in which control valves for controlling the supply of liquid fuel to the demand unit (14) are centrally arranged, and can be a fuel valve train (FVT).

[0149] When the demand source (14) is composed of a first demand source (141) that operates at high pressure, such as a propulsion engine, and a second demand source (142) that operates at low pressure, such as a power generation engine, the second fuel supply unit (32) may include a first fuel supply valve unit (321) provided on a high-pressure fuel supply line (L11) that connects the fuel tank (2) and the first demand source (141), and a second fuel supply valve unit (322) provided on a low-pressure fuel supply line (L12) that connects the fuel tank (2) and the second demand source (142).

[0150] The first fuel supply valve unit (321) can be provided between the high-pressure fuel supply unit (311) and the first demand unit (141) to fill the first demand unit (141) with liquid fuel.

[0151] The first fuel supply valve unit (321) can be opened when the liquid fuel supplied from the high-pressure fuel supply unit (311) reaches the pressure required by the first demand source (141).

[0152] A second fuel supply valve unit (322) may be provided between the low-pressure fuel supply unit (312) and the second demand unit (142) to fill the second demand unit (142) with liquid fuel.

[0153] The second fuel supply valve unit (322) can be opened when the liquid fuel supplied from the low-pressure fuel supply unit (312) reaches the pressure required by the second demand source (142).

[0154] The first fuel supply valve unit (321) and the second fuel supply valve unit (322) can be connected to the fuel tank (2) and the third return line (RL3), and liquid fuel can be returned through the third return line (RL3). In this embodiment, the third return line (RL3) is described as being connected to the fuel supply tank (22) of the fuel tank (2), but it can also be connected to the fuel storage tank (21).

[0155] The first demand source (141) and the second demand source (142) can be connected to the fuel tank (2) and the fourth return line (RL4), and the liquid fuel can be returned through the fourth return line (RL4). In this embodiment, the fourth return line (RL4) is described as being connected to the fuel supply tank (22) of the fuel tank (2), but it can also be connected to the fuel storage tank (21).

[0156] As illustrated in FIG. 2, in the present embodiment, the high-pressure fuel supply line (L11) connected to the front end of the first demand source (141) or the low-pressure fuel supply line (L12) connected to the front end of the second demand source (142) may have a double-pipe structure. One of the double-pipes is a pipe through which liquid fuel flows and is connected to the high-pressure fuel supply line (L11) or the low-pressure fuel supply line (L12), and the other pipe may be connected to the fourth return line (RL4) that returns the liquid fuel inside the first demand source (141) or the second demand source (142) to the fuel tank (2).

[0157] In addition, as illustrated in FIG. 2, in the present embodiment, an air inlet line (AL1) and an air discharge line (AL2) may be provided at the front end of the first demand source (141) to which the high-pressure fuel supply line (L11) is connected or at the front end of the second demand source (142) to which the low-pressure fuel supply line (L12) is connected so as to implement a gas safety zone. In this case, the air may be dry air.

[0158] The inert gas supply unit (33) can be configured to purge the fuel tank (2) and the fuel supply unit (3), etc.

[0159] As shown in FIG. 2, the inert gas supply unit (33) is connected to the high-pressure fuel supply line (L11) and the low-pressure fuel supply line (L12) at the front end of the second fuel supply unit (32) and can purge the inside of the high-pressure fuel supply line (L11) and the low-pressure fuel supply line (L12).

[0160] That is, the inert gas supply unit (33) is configured to supply an inert gas such as nitrogen gas (N2) or carbon dioxide gas (CO2), and may include a device for generating an inert gas or a device for storing an inert gas. This inert gas supply unit (33) can supply an inert gas to the fuel storage tank (21) and the fuel supply tank (22) constituting the fuel tank (2), the first fuel supply unit (31), the second fuel supply unit (32), the demand source (14), and various lines, and can purge liquid fuel with the inert gas.

[0161]

[0162] FIG. 3 is a second conceptual diagram for explaining a liquid fuel processing system according to the first embodiment of the present invention.

[0163] As illustrated in Fig. 3, the inert gas supply unit (33) is connected to the fuel storage tank (21) and the fuel supply tank (22) forming the fuel tank (2) and can purge the inside of the tank. The fuel storage tank (21) is connected to the inert gas supply unit (33) and can be purged by the inert gas supplied from the inert gas supply unit (33).

[0164] The vent mast (34) can be configured to discharge gases, etc. existing in the fuel tank (2) and fuel supply unit (3) to the outside.

[0165] The vent mast (34), as shown in FIG. 3, can be connected to the fuel storage tank (21) and the fuel supply tank (22) via a vent line (L3), and can control the pressure inside the tank by releasing the gas inside the tank to the outside.

[0166] The internal pressure can be controlled by releasing the internal gas to the outside through the vent mast (34). A pressure / vacuum control valve (PVRV) can be provided at the end of the vent line (L3). The opening of the pressure / vacuum control valve (PVRV) can be controlled by a pressure sensor (PS) installed in the fuel storage tank (21). A rupture disc (RD) can be installed at a part of the vent line (L3). The rupture disc (RD) is configured to automatically rupture when a dangerous situation is reached in which the internal pressure of the fuel storage tank (21) increases to a level that cannot be relieved through the vent mast (34).

[0167] In addition, the fuel storage tank (21) or the fuel supply tank (22) may be connected to a bunkering section (not shown) provided on the port and starboard sides of the hull (11) via a bunkering line (L4). The internal pressure may be regulated by releasing the internal gas to the outside through the bunkering section (5). The bunkering section (5) may be a bunker station.

[0168] An on / off valve (SV) may be provided in the bunkering line (L4). The on / off valve (SV) may be turned on / off by a pressure sensor (PS) installed in the fuel storage tank (21). In addition, liquid fuel may be supplied to the fuel storage tank (21) or the fuel supply tank (22) through the bunkering section (5) and the bunkering line (L4).

[0169] FIG. 4 is a drawing for explaining a fuel supply tank according to the first embodiment of the present invention.

[0170] As illustrated in Fig. 4, the fuel supply tank (22) may be formed such that its lower surface slopes downward at a predetermined angle from one side to the other. It may be formed as a square structure comprising an upper surface (not shown in the drawing symbol), a lower surface (not shown in the drawing symbol), and multiple side surfaces (not shown in the drawing symbol). Here, the lower surface may be provided to slope downward at a predetermined angle from one of the multiple side surfaces to the other side surface.

[0171] The fuel supply tank (22) may be provided with a bulkhead (228) inside. The fuel supply tank (22) may be formed in a square structure or may be formed in a cylindrical structure.

[0172] The fuel supply tank (22) may include a storage unit (22a) for storing liquid fuel to be supplied to a demand source (14), and a return unit (22b) that is partitioned by the storage unit (22a) and a bulkhead (228) and collects liquid fuel returned from the fuel supply unit (3) or the demand source (14).

[0173] The bulkhead (228) may be formed as a double bulkhead structure. The bulkhead (228) may be formed of a first bulkhead (228a) that is spaced apart from one side by a certain distance, connected to the upper surface, and extends in the lower direction by a certain length, and a second bulkhead (228b) that is spaced apart from the first bulkhead (228a) in the other side by a certain distance, connected to the lower surface, and extends in the upper direction by a certain length.

[0174] The return section (22b) can be separated from the storage section (22a) by a second partition wall (228b). The return section (22b) can include a first return section (22b1) and a second return section (22b2) separated from the first return section (22b1) by the first partition wall (228a).

[0175] The first return portion (22b1) may be formed by one side of the fuel supply tank (22) and the first bulkhead (228b), the second return portion (22b2) may be formed by the first bulkhead (228a) and the second bulkhead (228b), and the storage portion (22a) may be formed by the other side of the fuel supply tank (22) and the second bulkhead (228b).

[0176] The return section (22b) may be a space filled with liquid fuel returned through the third return line (RL3) connected to the second fuel supply section (32) or the fourth return line (RL4) connected to the demander (14). The third return line (RL3) or the fourth return line (RL4) may be connected to the upper surface of the fuel supply tank (22) corresponding to the return section (22b). Specifically, the third return line (RL3) or the fourth return line (RL4) may be connected to the upper surface of the fuel supply tank (22) corresponding to the first return section (22b1).

[0177] The return section (22b) may have a lower surface that slopes downward from one side toward the other side. Specifically, the return section (22b) may have a lower surface that slopes downward toward the second bulkhead (228b). Foreign substances in the liquid fuel returned from the fuel supply section (3) or the demand source (14) may be collected in an area adjacent to the second bulkhead (228b).

[0178] The storage unit (22a) may be a space filled with liquid fuel supplied through a fuel supply line (L1) connected to a fuel storage tank (21). The fuel supply line (L1) may be connected to the upper surface of the fuel supply tank (22) corresponding to the storage unit (22a). The storage unit (22a) may return the liquid fuel stored in the fuel supply tank (22) to the fuel storage tank (21) through a fuel return line (L2).

[0179] The storage unit (22a) may have a lower surface that slopes downward from one side toward the other side. Specifically, the storage unit (22a) may have a lower surface that slopes downward from the second bulkhead (228b) toward the other side of the fuel supply tank (22). The liquid fuel may move toward the other side of the fuel supply tank (22). In addition, the fuel supply line (L1) may extend adjacent to the other side of the fuel supply tank (22). In addition, the fuel supply line (L1) may extend adjacent to the lower surface of the fuel supply tank (22). In addition, the fuel return line (L2) may be provided adjacent to the other side of the fuel supply tank (22). In detail, the fuel return line (L2) may be provided on the lower surface of the fuel supply tank (22) adjacent to the other side of the fuel supply tank (22).

[0180] Since the returned liquid fuel filled in the return section (22b) may contain foreign substances and is therefore unsuitable for use as fuel for the demander (14), a drain line (L5) may be provided on the lower surface of the fuel supply tank (22) corresponding to the second return section (22b2) to discharge the returned liquid fuel to a drain tank (not shown) or the like. Specifically, the drain line (L5) may be formed on the lower surface of the second return section (22b2) adjacent to the second bulkhead (228b). The drain line (L5) may be opened and closed by a valve.

[0181] Additionally, a purging line (L6) for purging the interior may be provided on the upper surface of the fuel supply tank (22) corresponding to the second return section (22b2).

[0182] In addition, a vent line (L3) for discharging internal gas to the outside and a bunkering line (L4) for delivering internal gas to land facilities, etc. may be provided on the upper surface of the fuel supply tank (22) corresponding to the storage unit (22a).

[0183] Additionally, a fuel supply line (L11, L12) for delivering liquid fuel to a demander (14) may be provided on the lower side of the other side of the fuel supply tank (22) corresponding to the storage unit (22a).

[0184] FIG. 5 is a drawing for explaining a fuel supply tank according to a second embodiment of the present invention.

[0185] Referring to FIG. 5, the fuel supply tank (22) according to the second embodiment of the present invention has a return section (22b) that can collect fuel leaked from at least one of the fuel storage tank (21), the fuel supply tank (22), and the fuel supply section (3).

[0186] The return section (22b) can be separated into a first return section (22b1) and a second return section (22b2) by a first bulkhead (228a). Fuel leaking from at least one of the fuel storage tank (21), the fuel supply tank (22), and the fuel supply section (3) can be connected to the upper surface of the fuel supply tank (22) corresponding to the first return section (22b1).

[0187] A drip tray (not shown) may be provided to collect liquid fuel leaking from at least one of the fuel storage tank (21), the fuel supply tank (22), and the fuel supply unit (3). The drip tray may have various shapes, and for example, the drip tray may include a bottom surface extending horizontally and sides extending upward from both ends of the horizontal surface to receive liquid fuel up to a certain height. The drip tray may be placed below at least one of the fuel storage tank (21), the fuel supply tank (22), and the fuel supply unit (3). The liquid fuel discharged from the fuel storage tank (21), the fuel supply tank (22), and the fuel supply unit (3) may be transferred to the drip tray by gravity. Any drip tray that can collect leaked liquid fuel may be applied without limitation.

[0188] A leak treatment line (L7) may be provided on the upper surface of the fuel supply tank (22) to convey liquid fuel leaked from at least one of the fuel storage tank (21), the fuel supply tank (22), and the fuel supply unit (3). The leak treatment line (L7) may be connected to the upper surface of the fuel supply tank (22) corresponding to the return unit (22b). Specifically, the leak treatment line (L7) may be connected to the upper surface of the fuel supply tank (22) corresponding to the first return unit (22b1). The leak treatment line (L7) may connect the drip tray and the fuel supply tank (22). For example, the leak treatment line (L7) may be connected to the bottom surface of the drip tray. The bottom surface of the drip tray may have a shape that is inclined downward toward the leak treatment line (L7).

[0189] In addition, the fuel storage tank (21) or the fuel supply tank (22) may be connected to a bunkering unit (not shown) provided on the port side and starboard side of the hull (11) and a bunkering line (L4). The bunkering unit may transfer liquid fuel from the outside to the fuel storage tank (21) or the fuel supply tank (22). In addition, the bunkering unit may transfer gas inside the fuel storage tank (21) or the fuel supply tank (22) to the outside to control the internal pressure. An on / off valve (SV) may be provided in the bunkering line (L4). The on / off valve (SV) may be turned on / off by a pressure sensor (PS) installed in the fuel storage tank (21).

[0190] The return section (22b) can collect liquid fuel leaking from the bunkering section. Specifically, the drip tray collects liquid fuel leaking from the bunkering section, and the leaked liquid fuel can be delivered to the return section (22b) along a leak treatment line (L7) connected to the drip tray. The drip tray can be placed below the bunkering section.

[0191] A filter (221) may be provided in the return section (22b). The filter (221) can filter out foreign substances in the liquid fuel. The filter (221) can filter the liquid fuel returned through the third return line (RL3) connected to the second fuel supply section (32) or the fourth return line (RL4) connected to the demand source (14). In addition, the filter (221) can filter the liquid fuel returned through the leak treatment line (L7).

[0192] The filter (221) may be provided between the first partition wall (228a) and the second partition wall (228b). Specifically, the filter (221) may be fixed to the first partition wall (228a) and the second partition wall (228b). The filter (221) may be installed between the lower end of the first partition wall (228a) and the upper end of the second partition wall (228b). The filter (221) may be installed horizontally between the lower end of the first partition wall (228a) and the upper end of the second partition wall (228b).

[0193] The liquid fuel can be returned to the first return section (22b1) through at least one of the third return line (RL3), the fourth return line (RL4), and the leak treatment line (L7). When the return section (22b) is filled with liquid fuel to a certain height or more, the liquid fuel can pass through the filter (221) and move to the storage section (22a). The liquid fuel can be separated from foreign substances by density difference, and the liquid fuel above a certain height can be transferred from the return section (22b) to the storage section (22a). The fuel tank (2) may be provided with a line (not shown) that transfers the liquid fuel above a certain height of the return section (22b) to the storage section (22a).

[0194] The return section (22b) can collect bilge water generated from the ship (1). The return section (22b) can be connected to a bilge well (not shown) where bilge water is collected. A bilge line (not shown) connected to the bilge well can be connected to the upper surface of the fuel supply tank (22). Specifically, the bilge line can be connected to the upper portion of the first return section (22b1).

[0195]

[0196] FIG. 6 is a first conceptual diagram for explaining a liquid fuel processing system according to a third embodiment of the present invention.

[0197] Referring to FIG. 6, a liquid fuel processing system (10) according to a third embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demand unit (14) provided in a hull (11); a purging tank (4) that collects liquid fuel returned from the demand unit (14) or the fuel supply unit (3) together with a purging gas; and a transfer pump (P) that transfers the liquid fuel from the fuel tank (2) to the demand unit (14).

[0198] The fuel tank (2) may be at least one of a fuel storage tank (21) and a fuel supply tank (22). For example, the fuel tank (2) may be a fuel storage tank (21). The fuel tank (2) may be positioned lower than the fuel supply unit (3). In addition, the fuel tank (2) may be positioned lower than the purging tank (4).

[0199] The fuel supply unit (3) can supply liquid fuel to a demand source (14) provided in the hull (11). The fuel supply unit (3) can be provided above the fuel tank (2).

[0200] The transfer pump (P) may be provided inside the fuel tank (2). The transfer pump (P) may be provided at the bottom of the fuel tank (2). The liquid fuel may be transferred to the fuel supply unit (3) by the transfer pump (P) and supplied to the demander (14) through the fuel supply unit (3). The transfer pump (P) may be a submerged pump that operates in the liquid fuel. The liquid fuel of the demander (14) or the fuel supply unit (3) may be recovered (returned) to the fuel tank (2). The transfer pump (P) may be included in the fuel supply unit (3). The transfer pump (P) may be disposed outside the fuel tank (2) and may be accommodated in the pump room (6), but the present invention is not limited thereto.

[0201] In addition, although the transfer pump (P) in this specification is described as supplying liquid fuel to a demander (14) along a fuel supply line (L1), the transfer pump (P) can also transfer liquid fuel to the outside of the hull (11) via a bunkering line (L4). This transfer pump (P) may include a first fuel transfer pump (LP) that transfers first fuel and a second fuel transfer pump (DP) that transfers second fuel.

[0202] The liquid fuel can be recovered along the third return line (RL3) connected to the fuel supply unit (3). Specifically, the liquid fuel can be recovered along the third return line (RL3) connected to the second fuel supply unit (32). In addition, the liquid fuel can be recovered along the fourth return line (RL4) connected to the demand unit (14). The liquid fuel can be recovered when the supply of the liquid fuel to the demand unit (14) is stopped. At this time, the liquid fuel recovered along the third return line (RL3) or the fourth return line (RL4) can be collected in the purging tank (4).

[0203] The liquid fuel collected in the purging tank (4) can be transferred to the fuel tank (2) along the purging line (PL). The liquid fuel collected in the purging tank (4) can be transferred to the fuel tank (2) by gravity. The purging tank (4) can be placed above the fuel tank (2). A separate pumping means can be provided between the purging tank (4) and the fuel tank (2). The liquid fuel collected in the purging tank (4) can be transferred to the fuel tank (2) by the pumping means.

[0204] Liquid fuel in the fuel tank (2) can be delivered to the fuel supply unit (3) and supplied to the demand unit (14). The fuel tank (2) may be a fuel storage tank (21). That is, the fuel tank (2) can supply liquid fuel to the demand unit (14) without going through the fuel supply tank (22). At this time, the purging tank (4) can recover the liquid fuel from the fuel supply unit (3), etc. Here, the purging tank (4) may be a fuel supply tank (22). That is, the fuel supply tank (22) can recover the liquid fuel from the fuel supply unit (3), etc.

[0205]

[0206] Figure 7 is a second conceptual diagram for explaining a liquid fuel processing system according to a third embodiment of the present invention.

[0207] Referring to Fig. 7, the fuel tank (2) may be provided at the lower portion of the hull (11). Specifically, the fuel tank (2) may be provided in the hold (116) at the lower portion of the hull (11). The fuel tank (2) may be provided below the cabin (15) provided at the center portion of the hull (11). In addition, the fuel tank (2) may be provided below the bunkering section (5). In addition, the fuel tank (2) may be provided below the pump room (6). The fuel tank (2) may be surrounded by a cofferdam (7). The pump room (6) may accommodate a pump, a valve, and a measuring device.

[0208] The transfer pump (P) may be provided below the fuel tank (2). The transfer pump (P) may be provided between the bottom plate (113) and the fuel tank (2). The transfer pump (P) may be provided in a pump casing (PC) provided between the bottom plate (113) and the fuel tank (2). The liquid fuel in the fuel tank (2) may be moved to the transfer pump (P) by gravity. At this time, the fuel supply line (L1) may be provided outside the fuel tank (2). The fuel supply line (L1) may connect the transfer pump (P) provided below the fuel tank (2) and the fuel supply unit (3) provided above the fuel tank (2).

[0209] The liquid fuel processing system (10) according to the third embodiment of the present invention is such that the liquid fuel in the fuel tank (2) is supplied to the demander (14) by the transfer pump (P), and the liquid fuel recovered from the fuel supply unit (3) or the demander (14) to the purging tank (4) can be transferred to the fuel tank (2) by gravity.

[0210] The vessel (1) of the present invention may include a liquid fuel processing system (10) according to the third embodiment of the present invention. The vessel (1) may be a container ship transporting a container (C).

[0211]

[0212] Figure 8 is a first conceptual diagram for explaining a liquid fuel processing system according to a fourth embodiment of the present invention.

[0213] Referring to FIG. 8, a liquid fuel processing system (10) according to a fourth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demand unit (14) provided in a hull (11); a purging tank (4) that collects liquid fuel returned from the demand unit (14) or the fuel supply unit (3) together with a purging gas; and a purging pump (PP) that transfers liquid fuel stored in the purging tank (4) to the fuel tank (2).

[0214] The fuel tank (2) may be spaced apart from the floor surface on which the fuel tank (2) is placed. The fuel tank (2) may be supported by a support member (S). The support member (S) may be provided between the fuel tank (2) and the floor surface on which the fuel tank (2) is placed. A tank lower space (LS) may be formed between the fuel tank (2) and the floor surface on which the fuel tank (2) is placed. The floor surface on which the fuel tank (2) is placed may be the upper deck (111) of the hull (11). That is, the fuel tank (2) may be provided on the upper deck (111).

[0215] The fuel supply unit (3) can transfer the liquid fuel from the fuel tank (2) to the demand unit (14) by gravity. The fuel supply unit (3) may be provided below the fuel tank (2). The demand unit (14) may be provided below the fuel supply unit (3). A separate transfer pump may not be provided between the fuel tank (2) and the fuel supply unit (3).

[0216] Liquid fuel from the demand source (14) or the fuel supply unit (3) can be recovered to the fuel tank (2). The liquid fuel can be recovered along the third return line (RL3) connected to the fuel supply unit (3). Specifically, the liquid fuel can be recovered along the third return line (RL3) connected to the second fuel supply unit (32). Additionally, the liquid fuel can be recovered along the fourth return line (RL4) connected to the demand source (14). The liquid fuel can be recovered to the fuel tank (2) when the supply of liquid fuel to the demand source (14) is stopped.

[0217] Liquid fuel recovered along the third return line (RL3) or the fourth return line (RL4) can be collected in the purging tank (4). The liquid fuel collected in the purging tank (4) can be delivered to the fuel tank (2) along the purging line (PL).

[0218] A purging pump (PP) may be provided between the purging tank (4) and the fuel tank (2). Since the purging tank (4) may be positioned lower than the fuel tank (2), the liquid fuel collected in the purging tank (4) may be transferred to the fuel tank (2) by the purging pump (PP).

[0219] FIG. 9 is a second conceptual diagram for explaining a liquid fuel processing system according to a fourth embodiment of the present invention.

[0220] Referring to Fig. 9, a fuel tank (2) may be provided on the upper deck (111). A fuel supply unit (3) may be arranged in a lateral direction of the fuel tank (2). Specifically, the fuel supply unit (3) may be a first fuel supply unit (31). The first fuel supply unit (31) is provided below the fuel tank (2), and the liquid fuel of the fuel tank (2) may be transferred to the first fuel supply unit (31) by gravity. The first fuel supply unit (31) may be provided inside a pump room (not shown) provided in a lateral direction of the fuel tank (2).

[0221] The second fuel supply unit (32) may be placed at the stern (115). The second fuel supply unit (32) may be placed laterally of the engine casing (16) provided on the upper deck (111) above the engine room (13).

[0222] The liquid fuel processing system (10) according to the fourth embodiment of the present invention is such that the liquid fuel in the fuel tank (2) is supplied to the demander (14) by gravity, and the liquid fuel recovered from the fuel supply unit (3) or the demander (14) to the purging tank (4) can be transferred to the fuel tank (2) by the purging pump (PP).

[0223] The vessel (1) of the present invention may include a liquid fuel processing system (10) according to the fourth embodiment of the present invention. The vessel (1) may be a crude oil carrier transporting crude oil.

[0224]

[0225] FIG. 10 is a first conceptual diagram for explaining a liquid fuel processing system according to a fifth embodiment of the present invention.

[0226] Referring to FIG. 10, a liquid fuel processing system (10) according to a fifth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is arranged outside the fuel tank (2) and controls the supply of the liquid fuel; and a valve room (8) that accommodates the first transfer valve (V1) and forms an isolated space.

[0227] The first transfer valve (V1) can control the supply of liquid fuel from the fuel tank (2). The first transfer valve (V1) may be included in the fuel supply unit (3). The first transfer valve (V1) may be accommodated in the pump room (6).

[0228] The valve room (8) may be provided in a form that completely seals the inside and the outside. The valve room (8) can block the flow of liquid and gas between the inside and the outside. When liquid fuel leaks from the first transfer valve (V1) provided inside the valve room (8), the valve room (8) may have a form that prevents the leakage of liquid fuel and evaporated gas of the liquid fuel. For example, the valve room (8) may be of an enclosed type or a full containment type. Even if a leak occurs from the first transfer valve (V1), the valve room (8) can block the movement of gas to the outside, and thus the pressure of the fuel tank (2) can be maintained above a preset pressure.

[0229] The valve room (8) can form an isolated space. The valve room (8) can accommodate a first transfer valve (V1) in its internal space. The valve room (8) can be composed of a lower panel (81), a side panel (82) extending upward from an end of the lower panel (81), and an upper panel (83) covering the space formed by the side panel (82). The lower panel (81), the side panel (82), and the upper panel (83) can be connected to seal the internal space.

[0230] The second transfer valve (V2) may be arranged inside the fuel tank (2). In addition, the second transfer valve (V2) may be arranged at the bottom of the fuel tank (2). The second transfer valve (V2) may block the flow of liquid fuel when the liquid fuel leaks downstream of the fuel tank (2). The second transfer valve (V2) may block the flow of liquid fuel when the liquid fuel leaks from the first transfer valve (V1). The second transfer valve (V2) may be arranged upstream of the first transfer valve (V1).

[0231] The valve room (8) may be formed such that the lower panel (81) is parallel to the lower surface (201) of the fuel tank (2). In addition, at least a portion of the valve room (8) may be positioned lower than the lower surface (201) of the fuel tank (2).

[0232] FIG. 11 is a second conceptual diagram for explaining a liquid fuel processing system according to the fifth embodiment of the present invention.

[0233] The liquid fuel processing system (10) may further include a ventilation unit (9) installed to ventilate the inside of the valve room (8). The ventilation unit (9) may communicate the inside and the outside of the valve room (8). The ventilation unit (9) may circulate the air inside the valve room (8) and the air outside.

[0234] The ventilation unit (9) can block the circulation of air inside the valve room (8) and outside air in the event of a leak in the first transfer valve (V1). Therefore, in the event of a leak in the first transfer valve (V1), the valve room (8) can maintain the pressure of the fuel tank (2) above the preset pressure.

[0235] The ventilation unit (9) can ventilate the inside of the valve room (8) for the safety of the worker when a leak occurs in the first transfer valve (V1). That is, the ventilation unit (9) can supply air from outside the valve room (8) into the inside of the valve room (8). At this time, the ventilation unit (9) can block the air inside the valve room (8) from moving outside the valve room (8). That is, the ventilation unit (9) can control the air outside the valve room (8) to flow inward while blocking the air inside the valve room (8) from being discharged to the outside. Therefore, even when a leak occurs in the first transfer valve (V1), the valve room (8) can maintain the pressure of the fuel tank (2) above the preset pressure.

[0236] The ventilation unit (9) may be installed in at least one of the lower panel (81), the side panel (82), and the upper panel (83). The ventilation unit (9) may be formed by penetrating at least one of the lower panel (81), the side panel (82), and the upper panel (83). Specifically, the ventilation unit (9) may be formed in at least one of the side panel (82) and the upper panel (83). The ventilation unit (9) may be positioned higher than the lower surface (201) of the fuel tank (2).

[0237] The fuel tank (2) can be connected to a demand source (14) via a fuel supply line (L1). The fuel supply line (L1) can pass through a valve room (8). The fuel supply line (L1) can extend in a direction parallel to the lower surface (201) of the fuel tank (2).

[0238] A first transfer valve (V1) or transfer pump (P) may be provided on the fuel supply line (L1). A transfer pump (P) may be provided downstream of the first transfer valve (V1). The transfer pump (P) may supply liquid fuel from the fuel tank (2) to the demand source (14).

[0239]

[0240] Figure 12 is a conceptual diagram for explaining a liquid fuel processing system according to the sixth embodiment of the present invention.

[0241] Referring to FIG. 12, a liquid fuel processing system (10) according to a sixth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is arranged outside the fuel tank (2) and controls the supply of the liquid fuel; and a valve room (8) that accommodates the first transfer valve (V1) and forms an isolated space.

[0242] The valve room (8) may be provided in a form that partially seals the inside and outside. In the valve room (8), liquid and gas flow between the inside and the outside may be possible.

[0243] When liquid fuel leaks from the first transfer valve (V1) provided inside the valve room (8), the valve room (8) can collect the liquid fuel and transfer the collected liquid fuel to the leak treatment line (L7). The valve room (8) may be of the partial containment type.

[0244] The leak treatment line (L7) may be connected to a separately provided drain tank (not shown) and the return section (22b) shown in Fig. 5, but the present invention is not limited thereto. A valve (not shown) for blocking the flow of liquid fuel may be provided on the leak treatment line (L7).

[0245] A drip tray (not shown) may be provided below the valve room (8). The drip tray can collect liquid fuel leaking from the first transfer valve (V1).

[0246]

[0247] Figure 13 is a conceptual diagram for explaining a liquid fuel processing system according to the seventh embodiment of the present invention.

[0248] Referring to FIG. 13, a liquid fuel processing system (10) according to a seventh embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is arranged outside the fuel tank (2) and controls the supply of the liquid fuel; and a valve room (8) that accommodates the first transfer valve (V1) and forms an isolated space.

[0249] The fuel tank (2) may be configured to have a lower surface (201), a plurality of side surfaces (202), and an upper surface (203) and to form a fuel receiving space therein. A tank lower space (LS) may be formed below the fuel tank (2). At least a portion of the fuel supply line (L1) may extend in a vertical direction of the lower surface (201) of the fuel tank (2). That is, at least a portion of the fuel supply line (L1) may extend into the tank lower space (LS). At this time, the fuel supply line (L1) may extend below the fuel tank (2) and may have an end bent to extend in a direction parallel to the lower surface (201) of the fuel tank (2).

[0250] The fuel tank (2) may be provided on the upper deck (111) or may be provided spaced apart from the bottom plate (113), and the tank lower space (LS) may be formed between the upper deck (111) or the bottom plate (113) and the lower surface (201) of the fuel tank (2). However, the present invention is not limited thereto.

[0251] The valve room (8) can accommodate a first transfer valve (V1) therein. The valve room (8) can be provided laterally of the fuel tank (2). At least a portion of the valve room (8) can be formed below the lower surface (201) of the fuel tank (2). The first transfer valve (V1) can be provided below the lower surface (201) of the fuel tank (2).

[0252] The valve room (8) may be provided in a form that completely seals the inside and outside, or in a form that partially seals the inside and outside, and the present invention is not limited thereto.

[0253]

[0254] Figure 14 is a conceptual diagram for explaining a liquid fuel processing system according to the eighth embodiment of the present invention.

[0255] Referring to FIG. 14, a liquid fuel processing system (10) according to an eighth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is arranged outside the fuel tank (2) and controls the supply of the liquid fuel; and a valve room (8) that accommodates the first transfer valve (V1) and forms an isolated space.

[0256] The valve room (8) and the pump casing (PC) may be provided at the bottom of the fuel tank (2). The valve room (8) and the pump casing (PC) may be arranged at the bottom of the cofferdam (7) provided between adjacent fuel tanks (2). The valve room (8) is used for managing the fuel tank (2) and may be used as a TCS (Tank Connection Space) connecting the fuel supply unit (3) and the fuel tank (2).

[0257]

[0258] FIG. 15 is a cross-sectional view taken along portion “A” to explain the liquid fuel processing system illustrated in FIG. 14.

[0259] Referring to Fig. 15, a tank lower space (LS) may be formed below the fuel tank (2). At least one of a valve room (8) and a pump casing (PC) may be arranged in the tank lower space (LS). The fuel tank (2) may be formed spaced apart from the bottom plate (113), and although not shown in the drawing, may be formed on the upper deck (111).

[0260] At least one fuel tank (2) may be provided in the hold (116). A plurality of fuel tanks (2) may be provided in the left and right directions of the hull (11) in the hold (116). A cofferdam (7) may be provided between the side shell plate (112) and the fuel tank (2). In addition, a cofferdam (7) may be provided between the fuel tanks (2).

[0261] Liquid fuel in the fuel tank (2) can be supplied to a demand source (14) along a fuel supply line (L1). At this time, at least a portion of the fuel supply line (L1) can pass through the fuel tank (2). Specifically, the fuel supply line (L1) can pass through a space in the fuel tank (2) where the liquid fuel is stored.

[0262] Additionally, the fuel supply line (L1) may pass through a cofferdam (7) provided between fuel tanks (2) or a cofferdam (7) provided between the fuel tank (2) and the side shell plate (112). The fuel supply line (L1) may include a line through which liquid fuel is transferred from the fuel storage tank (21) to the fuel supply tank (22).

[0263] Meanwhile, the fuel tank (2) may be provided with a bunkering line (L4) that connects the bunkering section (5) and the fuel tank (2) inside. Liquid fuel may be supplied to the fuel tank (2) through the bunkering section (5), or gas, etc. inside the fuel tank (2) may be transferred to the outside. The bunkering line (L4) may include a liquid line (L41) and a vapor line (L42).

[0264] A valve room (8) may be provided below the fuel tank (2). A first transfer valve (V1) may be accommodated inside the valve room (8).

[0265] A pump casing (PC) may be provided below the fuel tank (2). A transfer pump (P) may be accommodated inside the pump casing (PC). The pump casing (PC) may be provided on one side of the valve room (8).

[0266] The valve room (8) and the pump casing (PC) may share a partition wall (8b). The valve room (8) and the pump casing (PC) may be formed by a wall (8a) forming a receiving space; and a partition wall (8b) separating the receiving space. The valve room (8) may be formed by one surface of the wall (8a) and the partition wall (8b), and the pump casing (PC) may be formed by the other surface of the wall (8a) and the partition wall (8b). The wall (8a) may be made of a material having relatively greater rigidity than the partition wall (8b), but the present invention is not limited thereto.

[0267] The receiving space formed by the wall (8a) can be separated by a bulkhead (8b), and each space formed by separating the receiving space can become a valve room (8) and a pump casing (PC). In addition, the valve room (8) and the pump casing (PC) can be formed with independent walls, but the present invention is not limited thereto.

[0268] A separate pump room (6) may be provided on the upper part of the fuel tank (2). The pump room (6) may accommodate a bilge pump or the like, but the present invention is not limited thereto.

[0269] A drain portion (204) may be provided inside the fuel tank (2). Liquid fuel leaking from the fuel tank (2), fuel supply portion (3), bunkering portion (5), and pump room (6) may be collected in the drain portion (204). In addition, since the fuel tank (2) serves as a fuel storage tank (21), liquid fuel recovered from the fuel supply tank (22) may be collected in the drain portion (204).

[0270]

[0271] Figure 16 is a conceptual diagram for explaining a liquid fuel processing system according to the ninth embodiment of the present invention.

[0272] Referring to FIG. 16, a liquid fuel processing system (10) according to a tenth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is disposed outside the fuel tank (2) and controls the supply of liquid fuel; and a second transfer valve (V2) that is disposed inside the fuel tank (2) and blocks the flow of liquid fuel when the liquid fuel leaks downstream of the fuel tank (2).

[0273] The first transfer valve (V1) may be arranged outside the fuel tank (2). In addition, the first transfer valve (V1) may be provided downstream of the fuel tank (2). The first transfer valve (V1) may be provided at the bottom of the fuel tank (2). The first transfer valve (V1) may be provided on a fuel supply line (L1) connecting the fuel tank (2) and a demand source (14). The fuel supply line (L1) may extend parallel to the lower surface (201) of the fuel tank (2).

[0274] The second transfer valve (V2) may be arranged inside the fuel tank (2). The second transfer valve (V2) may be arranged at the bottom of the fuel tank (2). The second transfer valve (V2) may block the flow of liquid fuel when the liquid fuel leaks downstream of the fuel tank (2). The second transfer valve (V2) may block the flow of liquid fuel when the liquid fuel leaks from the first transfer valve (V1). The second transfer valve (V2) may be arranged upstream of the first transfer valve (V1).

[0275] The transfer pump (P) may be provided downstream of the first transfer valve (V1).

[0276]

[0277] Figure 17 is a conceptual diagram for explaining a liquid fuel processing system according to the tenth embodiment of the present invention.

[0278] Referring to FIG. 17, a liquid fuel processing system (10) according to a tenth embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a first transfer valve (V1) that is disposed outside the fuel tank (2) and controls the supply of liquid fuel; and a second transfer valve (V2) that is disposed inside the fuel tank (2) and blocks the flow of liquid fuel when the liquid fuel leaks downstream of the fuel tank (2).

[0279] The valve room (8) can form an isolated space. The valve room (8) can accommodate a first transfer valve (V1). The valve room (8) can have a lower panel (81) formed parallel to the lower surface (201) of the fuel tank (2). In addition, at least a portion of the valve room (8) can be arranged below the lower surface (201) of the fuel tank (2).

[0280] The transfer pump (P) may be provided downstream of the first transfer valve (V1). The transfer pump (P) may be provided outside the valve room (8).

[0281]

[0282] FIG. 18 is a first conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0283] Referring to FIG. 18, a liquid fuel processing system (10) according to an eleventh embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a bunkering unit (5) that transfers liquid fuel from the outside to the fuel tank (2); and a leak treatment unit (70) that treats liquid fuel leaking from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5).

[0284] A leak treatment unit (70) may include a drip tray (71) for collecting liquid fuel leaking from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5); a leak treatment line (L7) connected to the drip tray (71) for draining the liquid fuel collected in the drip tray (71); a drain sensor (72) provided in the leak treatment line (L7); and a drain valve (73) for transferring the liquid fuel collected in the drip tray (71) during bunkering to the leak treatment line (L7).

[0285] The drip tray (71) may have various shapes, and for example, the drip tray (71) may include a bottom surface extending horizontally and side surfaces extending upward from both ends of the horizontal surface to receive liquid fuel up to a certain height. The drip tray (71) may be placed below at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5). The liquid fuel discharged from the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5) may be transferred to the drip tray (71) by gravity. The drip tray (71) may be applied without limitation as long as it can collect the leaked liquid fuel.

[0286] The leak treatment line (L7) can drain the liquid fuel collected in the drip tray (71). The leak treatment line (L7) can be connected to a separately provided drain tank (not shown) or the return section (22b) shown in Fig. 5, but the present invention is not limited thereto.

[0287] A drain sensor (72) may be provided in a leak treatment line (L7). It can measure the level of liquid fuel collected in the drip tray (71). The drain sensor (72) can measure the amount of liquid fuel leaked from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5). In addition, whether liquid fuel leaks from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5) can be determined by the drain sensor (72). Whether liquid fuel leaks can be determined automatically, and the present invention is not limited thereto.

[0288] The drain sensor (72) may be a level switch, and may measure the level by various methods such as air purge, electrostatic capacitance, ultrasonic, radiation, and electrode, but the present invention is not limited thereto.

[0289] A drain valve (73) may be provided in the leak treatment line (L7). The drain valve (73) may be provided upstream of the drain sensor (72). The drain valve (73) may transfer the liquid fuel collected in the drip tray (71) when bunkering is performed by the bunkering unit (5) to the leak treatment line (L7). The drain sensor (72) may measure the level of the liquid fuel transferred along the leak treatment line (L7).

[0290] The drip tray (71) may have a structure that is exposed (open) to the outside. Therefore, foreign substances may flow into the drip tray (71). For example, when it rains, water may flow into the drip tray (71). At this time, the foreign substances flowing into the drip tray (71) may be transmitted to the drain sensor (72) along the leak treatment line (L7). The drain valve (73) may block the liquid fuel containing the foreign substances. Therefore, the drain valve (73) may prevent the liquid fuel containing the foreign substances from being measured as the amount of liquid fuel leakage by the drain sensor (72).

[0291] Referring to Fig. 18, the bunkering unit (5) may include a first bunkering unit (51) arranged on the left side (port side) of the hull (11) and a second bunkering unit (52) arranged on the right side (starboard side) of the hull (11). However, the present invention is not limited by the arrangement of the bunkering unit (5).

[0292]

[0293] FIG. 19 is a second conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0294] Referring to FIG. 19, a liquid fuel processing system (10) according to an eleventh embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a bunkering unit (5) that transfers liquid fuel from the outside to the fuel tank (2); and a leak treatment unit (70) that treats liquid fuel leaking from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5).

[0295] The fuel tank (2) may include a fuel storage tank (21) and a fuel supply tank (22). A drip tray (71) may be arranged under at least one of the fuel storage tank (21), the fuel supply tank (22), the fuel supply section (3), and the bunkering section (5). Specifically, a drip tray (71) may be arranged under each of the fuel storage tank (21), the fuel supply tank (22), the fuel supply section (3), and the bunkering section (5). The drip tray (71) may include a first drip tray (71a) arranged under the fuel storage tank (21), a second drip tray (71b) arranged under the fuel supply tank (22), a third drip tray (71c) arranged under the fuel supply section (3), and a fourth drip tray (71d) arranged under the bunkering section (5). The bunkering section (5) may include a first bunkering section (51) and a second bunkering section (52), and a fourth drip tray (71d1, 71d2) may be provided under the first bunkering section (51) and the second bunkering section (52), respectively.

[0296] A drain sensor (72) may be provided on each drip tray (71). Specifically, the drain sensor (72) may be provided on a surface where liquid fuel is collected in the drip tray (71). The drain sensor (72) may be provided at a certain height from the bottom surface of the drip tray (71), but it is preferable that the drain sensor (72) be provided close to the bottom surface of the drip tray (71) for rapid detection of liquid fuel leakage. The drain sensor (72) may include a first drain sensor (72a) provided on a first drip tray (71a), a second drain sensor (72b) provided on a second drip tray (71b), a third drain sensor (72c) provided on a third drip tray (71c), and a fourth drain sensor (72d) provided on a fourth drip tray (71d).

[0297] The drain sensor (72a, 72b, 72c, 72d) can sound a leak warning or transmit a leak signal when a liquid fuel leak is detected. Accordingly, the area where a leak has occurred can be identified based on the leak warning or leak signal.

[0298]

[0299] FIG. 20 is a third conceptual diagram for explaining a liquid fuel processing system according to the 11th embodiment of the present invention.

[0300] Referring to FIG. 20, a liquid fuel processing system (10) according to an eleventh embodiment of the present invention may include a fuel supply unit (3) that supplies liquid fuel from a fuel tank (2) to a demander (14); a bunkering unit (5) that transfers liquid fuel from the outside to the fuel tank (2); and a leak treatment unit (70) that treats liquid fuel leaking from at least one of the fuel tank (2), the fuel supply unit (3), and the bunkering unit (5).

[0301] A drip tray (71) may be provided below each of the fuel storage tank (21), fuel supply tank (22), fuel supply section (3), and bunkering section (5).

[0302] A leak treatment line (L7) connected to the drip tray (71) to drain the liquid fuel collected in the drip tray (71) may be provided. The leak treatment line (L7) may be provided in each of the drip trays (71). The leak treatment line (L7) may include a first leak treatment line (L7a) connected to the fuel storage tank (21), a second leak treatment line (L7b) connected to the fuel supply tank (22), a third leak treatment line (L7c) connected to the fuel supply unit (3), and a fourth leak treatment line (L7d) connected to the bunkering unit (5).

[0303] The first leak treatment line (L7a), the second leak treatment line (L7b), the third leak treatment line (L7c), and the fourth leak treatment line (L7d) can be connected to each other and integrated into a single line. After integration, the leak treatment lines (L7a, L7b, L7c, L7d) can be connected to a separately provided drain tank (not shown) and the return section (22b) illustrated in FIG. 5. However, the present invention is not limited thereto.

[0304] The drain sensor (72) may be provided at a portion where at least two of the leak treatment lines (L7a, L7b, L7c, L7d) among the first leak treatment line (L7a), the second leak treatment line (L7b), the third leak treatment line (L7c), and the fourth leak treatment line (L7d) are integrated. The position where the first leak treatment line (L7a), the second leak treatment line (L7b), the third leak treatment line (L7c), and the fourth leak treatment line (L7d) are integrated may be determined depending on the position of the fuel storage tank (21), the fuel supply tank (22), the fuel supply section (3), the bunker section (5), and the drain tank (not shown) to which the leak treatment line (L7) is connected. The first leak treatment line (L7a), the second leak treatment line (L7b), the third leak treatment line (L7c), and the fourth leak treatment line (L7d) can be integrated at a position where the total length of the leak treatment line is the shortest.

[0305] In addition, the drain sensor (72) is arranged upstream of a portion where at least two leak treatment lines (L7a, L7b, L7c, L7d) among the first leak treatment line (L7a), the second leak treatment line (L7b), the third leak treatment line (L7c), and the fourth leak treatment line (L7d) are integrated, so that one drain sensor (72) can detect whether a leak has occurred in at least two leak treatment lines (L7a, L7b, L7c, L7d).

[0306] Whether liquid fuel has leaked from at least one of the fuel storage tank (21), fuel supply tank (22), fuel supply section (3), and bunkering section (5) can be determined by the drain sensor (72).

[0307] In the liquid fuel processing system (10) according to the present embodiment, the length of the leak processing line is minimized and the number of drain sensors is reduced by considering the locations of the fuel tank (2), fuel supply unit (3), and bunkering unit (5), so that the equipment cost can be reduced.

[0308] In the liquid fuel processing system (10) according to the present embodiment, it has been described that a leak treatment unit is provided in each of the fuel storage tank (21), the fuel supply tank (22), the fuel supply unit (3), and the bunkering unit (5), but the present invention is not limited thereto.

[0309]

[0310] FIG. 21 is a first conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0311] Referring to FIG. 21, a liquid fuel processing system (10) according to a twelfth embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points. The fuel tank (2) may include a first storage section (2a) that stores the first fuel or the second fuel; a second storage section (2b) that is separated from the first storage section (2a) by a partition wall (2c) and stores the second fuel having a relatively high boiling point; and a communication section (2d) that opens at least a portion of the partition wall (2c) to connect the first storage section (2a) and the second storage section (2b).

[0312] The first fuel and the second fuel may be liquid fuels that remain liquid at room temperature and 1 atm of pressure. The first fuel and the second fuel may be substances used as fuel for ships. The second fuel may have a relatively higher boiling point than the first fuel. For example, the first fuel may be methanol, ethanol, etc., and the second fuel may be kerosene, heavy oil, etc., but the present invention is not limited thereto.

[0313] The first fuel can be stored in the first storage unit (2a). The second fuel can be stored in the first storage unit (2a) or the second storage unit (2b). The second storage unit (2b) can be formed as an empty space when the first fuel is stored in the first storage unit (2a). When the first fuel is stored in the first storage unit (2a), the second storage unit (2b) can be used as a cofferdam. That is, when the first fuel is stored in the first storage unit (2a), the second storage unit (2b) can prevent the first fuel from leaking out of the fuel tank (2).

[0314] Conversely, the second storage unit (2b) may be filled with the second fuel when the second fuel is stored in the first storage unit (2a). In addition, when the second fuel is stored in the first storage unit (2a), at least a portion of the cofferdam (7) surrounding the fuel tank (2) may be filled with the second fuel. For example, a cofferdam (7) may be provided in at least a portion of the space between the lower surface (201) of the fuel tank (2) and the bottom plate (113), and the second fuel may be filled in the cofferdam (7).

[0315] The first storage section (2a) may be arranged above the second storage section (2b). The bulkhead (2c) may be provided at the lower portion of the fuel tank (2). The bulkhead (2c) may be arranged in a direction parallel to the lower surface of the fuel tank (2). The bulkhead (2c) may vertically separate the first storage section (2a) and the second storage section (2b). The liquid fuel may move from the first storage section (2a) to the second storage section (2b) by gravity.

[0316] A communication portion (2d) may be provided in the bulkhead (2c). The communication portion (2d) may open or block at least a portion of the bulkhead (2c). Liquid fuel may move through the communication portion (2d) provided in the bulkhead (2c). Any device capable of blocking the movement of liquid fuel, such as a valve, may be used as the communication portion (2d) without limitation.

[0317] The liquid fuel processing system (10) may further include a second fuel transfer pump (DP) provided outside the fuel tank (2) and transporting the second fuel. A valve (not shown) for communicating the fuel tank (2) and the second fuel transfer pump (DP) may be provided on the lower surface (201) of the fuel tank (2). The valve provided on the lower surface (201) of the fuel tank (2) may be provided on a fuel supply line (L1) connected to the second fuel transfer pump (LP). The fuel supply line (L1) may be a line through which the second fuel is transported. The fuel supply line (L1) may pass through the inside of the fuel tank (2) or may pass through at least a part of the cofferdam (7). In this case, the first fuel transfer pump (DP) for transporting the first fuel may be provided inside the fuel tank (2), but the present invention is not limited thereto.

[0318]

[0319] FIG. 22 is a second conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0320] Referring to FIG. 22, a liquid fuel processing system (10) according to a twelfth embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points. The fuel tank (2) may include a first storage section (2a) that stores the first fuel or the second fuel; a second storage section (2b) that is separated from the first storage section (2a) by a partition wall (2c) and stores the second fuel having a relatively high boiling point; and a communication section (2d) that opens at least a portion of the partition wall (2c) to connect the first storage section (2a) and the second storage section (2b).

[0321] The fuel tank (2) further includes an isolation portion (2e) provided in the first storage portion (2a) and surrounding the first fuel transfer pump (LP), and the isolation portion (2e) can isolate the first fuel transfer pump (LP) from the second fuel when the second fuel is stored in the first storage portion (2a). In detail, the isolation portion (2e) can cover at least a portion of the first fuel transfer pump (LP). For example, at least a portion of the first fuel transfer pump (LP) can be covered by the isolation portion (2e), and the remaining portion can be covered by the side surface (202) and the upper surface (203) of the fuel tank (2).

[0322] Additionally, the isolation section (2e) may be formed to extend upward from the bulkhead (2c). Accordingly, the first fuel transfer pump (LP) may be at least partially covered by the bulkhead (2c).

[0323] The isolation section (2e) may be provided with a valve (not shown) that allows liquid fuel to flow. The first fuel may pass through the valve of the isolation section (2e) and be transferred to the first fuel transfer pump (LP). The first fuel transfer pump (LP) may be a submerged pump, a submerged pump, or the like, and may be operated while submerged in the first fuel. When the second fuel is supplied to the first storage section (2a), the second fuel may be blocked by the valve.

[0324] The first fuel transfer pump (LP) may be connected to a fuel supply line (L1) that supplies liquid fuel from a fuel tank (2) to a demand source (14). The fuel supply line (L1) may be a line through which the first fuel is transferred. The fuel supply line (L1) may pass through a space surrounded by an isolation portion (2e) in the fuel tank (2).

[0325] The fuel tank (2) can be connected to a bunkering line (L4) that supplies liquid fuel from the outside to the fuel tank (2). The bunkering line (L4) can be connected to a first storage section (2a) of the fuel tank (2). When the liquid fuel is a second fuel, the liquid fuel can be supplied to the second storage section (2b) through a communication section (2d). When the liquid fuel is a first fuel, the liquid fuel can be blocked at the communication section (2d). In addition, the liquid fuel can be supplied through the second storage section (2b), and the present invention is not limited thereto.

[0326]

[0327] FIG. 23 is a third conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0328] Referring to FIG. 23, a liquid fuel processing system (10) according to a twelfth embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points. The fuel tank (2) may include a first storage section (2a) that stores the first fuel or the second fuel; a second storage section (2b) that is separated from the first storage section (2a) by a partition wall (2c) and stores the second fuel having a relatively high boiling point; and a communication section (2d) that opens at least a portion of the partition wall (2c) to connect the first storage section (2a) and the second storage section (2b).

[0329] The fuel tank (2) may include a housing (2f). The housing (2f) may include a housing body (2f1) and a housing cover (2f2). The fuel tank (2) further includes a housing body (2f1) having one end extending from one surface of the fuel tank (2) and the other end having an opening; and a housing cover (2f2) blocking the opening of the housing body (2f1). When storing a second fuel in the first storage section (2a), the housing cover (2f2) may isolate a first fuel transfer pump (LP) disposed inside the housing body (2f1) from the second fuel.

[0330] The housing body (2f1) may be arranged in the upper direction of the bulkhead (2c). The housing body (2f1) may include a protrusion (not shown) formed to extend in the circumferential direction of the housing body (2f1) at the other end where the opening is formed.

[0331] The housing cover (2f2) can be provided facing the housing body (2f1). The housing cover (2f2) can be coupled with an opening of the housing body (2f1) to cover the opening. The housing cover (2f2) can be coupled to a protrusion formed at the other end of the housing body (2f1). When the housing cover (2f2) is in contact with the protrusion of the housing body (2f1), the housing cover (2f2) and the protrusion can be fixed by a coupling portion (2f3) that is movably coupled to the protrusion and the housing cover (2f2). The housing body (2f1) and the housing cover (2f2) can form a foot valve. However, the present invention is not limited by the blocking method of the opening of the housing body (2f1).

[0332] When the first fuel is supplied to the first storage unit (2a), the blocking of the opening of the housing body (2f1) can be released. Accordingly, the first fuel can move into the interior of the housing body (2f1) and be delivered to the first fuel transfer pump (LP). The first fuel transfer pump (LP) is a submerged pump, a submerged pump, or the like, and can be operated while being submerged in the first fuel. When the second fuel is supplied to the first storage unit (2a), the second fuel can be blocked by the housing cover (2f2).

[0333]

[0334] FIG. 24 is a fourth conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0335] Referring to FIG. 24, a liquid fuel processing system (10) according to a 12th embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points. The fuel tank (2) may include a first storage section (2a) that stores the first fuel or the second fuel; a second storage section (2b) that is separated from the first storage section (2a) by a partition wall (2c) and stores the second fuel having a relatively high boiling point; and a communication section (2d) that opens at least a portion of the partition wall (2c) to connect the first storage section (2a) and the second storage section (2b).

[0336] The above fuel tank (2) further includes a pump casing (PC) provided in the second storage section (2b) and surrounding the first fuel transfer pump (LP), and the pump casing (PC) can isolate the first fuel transfer pump (LP) from the second fuel when the second fuel is stored in the first storage section (2a).

[0337] The pump casing (PC) accommodates a first fuel transfer pump (LP) and can isolate the first fuel transfer pump (LP) from the second storage unit (2b). The pump casing (PC) can isolate the first fuel transfer pump (LP) accommodated therein from the second fuel even when the second fuel is supplied to the second storage unit (2b).

[0338] In addition, a valve (not shown) for allowing liquid fuel to flow may be provided in the bulkhead (2c). The valve may be connected to the first fuel transfer pump (LP) through a separate line (not shown). The first fuel may pass through the valve in the bulkhead (2c) and move to the first fuel transfer pump (LP). When the second fuel is supplied to the first storage unit (2a), the second fuel may be blocked by the valve in the bulkhead (2c). Of course, the valve provided in the bulkhead (2c) may be provided in a line connecting the first fuel transfer pump (LP) and the fuel tank (2).

[0339] Additionally, the pump casing (PC) may be provided outside the fuel tank (2). For example, the pump casing (PC) may be provided in the space between the lower surface (201) of the fuel tank (2) and the bottom plate (113). For example, when the second fuel is filled in the space between the lower surface (201) of the fuel tank (2) and the bottom plate (113), the pump casing (PC) may isolate the first fuel transfer pump (LP) from the second fuel.

[0340] A plurality of valves may be provided in the bulkhead (2c). Specifically, the bulkhead (2c) may be provided with a valve connected to the first fuel transfer pump (LP) and a valve connecting the first storage unit (2a) and the second storage unit (2b).

[0341]

[0342] FIG. 25 is a fifth conceptual diagram for explaining a liquid fuel processing system according to the 12th embodiment of the present invention.

[0343] Referring to FIG. 25, a liquid fuel processing system (10) according to a twelfth embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points. The fuel tank (2) may include a first storage section (2a) that stores the first fuel or the second fuel; a second storage section (2b) that is separated from the first storage section (2a) by a partition wall (2c) and stores the second fuel having a relatively high boiling point; and a communication section (2d) that opens at least a portion of the partition wall (2c) to connect the first storage section (2a) and the second storage section (2b).

[0344] The fuel tank (2) may further include a heating unit (2g) provided inside the fuel tank (2) and configured to heat the second fuel. The second fuel has a relatively high viscosity at low temperatures and thus has a slow movement speed. Therefore, since unloading or transporting the second fuel requires a long time, the heating unit (2g) may maintain the second fuel at a certain temperature or higher to reduce unloading time, etc. The heating unit (2g) may be operated when the second fuel is stored in the first storage unit (2a) or the second storage unit (2b). The heating unit (2g) may be a heating coil and may be operated while immersed in liquid fuel, but the present invention is not limited thereto.

[0345] The heating unit (2g) may be provided in the first storage unit (2a) or the second storage unit (2b). Specifically, the heating unit (2g) may be provided in the second storage unit (2b). When the second fuel is stored in the fuel tank (2), the communication unit (2d) of the bulkhead (2c) may be opened to allow the liquid fuel to move between the first storage unit (2a) and the second storage unit (2b). At this time, when the heating unit (2g) heats the second fuel in the second storage unit (2b), the second fuel in the first storage unit (2a) and the second storage unit (2b) may be heated as the second fuel in the second storage unit (2b) moves to the first storage unit (2a).

[0346] In addition, when storing the first fuel in the first storage unit (2a), the communication unit (2d) of the bulkhead (2c) can block the liquid fuel from moving between the first storage unit (2a) and the second storage unit (2b). At this time, the second storage unit (2b) can be formed as an empty space.

[0347] The heating unit (2g) can heat the fuel tank (2). Specifically, the heating unit (2g) can heat the second storage unit (2b). When the first fuel is stored in the first storage unit (2a), the heating unit (2g) can heat the first fuel. The heat of the second storage unit (2b) can be transferred to the first storage unit (2a) through the bulkhead (2c). When the heating unit (2g) heats the liquid fuel to the temperature required by the demand unit (14), the heat exchanger provided between the fuel tank (2) and the demand unit (14) can be omitted.

[0348] Although not shown in the drawing, the heating unit (2g) may be provided in at least one of the cofferdams (7) surrounding the fuel tank (2). For example, the heating unit (2g) may be provided in the cofferdam (7) covering the side (202) of the fuel tank (2). The heating unit (2g) may heat the secondary fuel when the secondary fuel is stored in the cofferdam (7).

[0349] The liquid fuel processing system (10) further includes a fuel supply unit (3) that supplies liquid fuel received from the fuel tank (2) to a demander (14), and the fuel supply unit (3) may include a temperature control unit (TC) that controls the temperature of the liquid fuel in response to the required temperature of the demander (14).

[0350] A temperature control unit (TC) may be provided between the fuel tank (2) and the demand source (14). The temperature control unit (TC) may heat or cool the liquid fuel. For example, the temperature control unit (TC) may heat the liquid fuel. The temperature control unit (TC) may adjust the temperature of the liquid fuel in response to the temperature required by the demand source (14). The temperature required by the demand source (14) may be higher than the temperature of the liquid fuel in the fuel tank (2).

[0351] In addition, the temperature control unit (TC) may be operated in consideration of the pressure and temperature inside the fuel tank (2). For example, when the pressure inside the fuel tank (2) is above a certain pressure, the heating unit (2g) may be operated relatively less, and the temperature control unit (TC) may be operated relatively more, to prevent the pressure in the fuel tank (2) from further increasing.

[0352]

[0353] Figure 26 is a conceptual diagram for explaining a liquid fuel processing system according to the 13th embodiment of the present invention.

[0354] Referring to FIG. 26, a liquid fuel processing system (10) according to a 13th embodiment of the present invention includes a fuel tank (2) that stores either a first fuel or a second fuel having different boiling points; and a fuel supply unit (3) that supplies the liquid fuel received from the fuel tank (2) to a demander (14); and the fuel tank (2) may include a first storage unit (2a) that stores the first fuel or the second fuel; and a heating unit (2g) that is provided inside the fuel tank (2) and heats the liquid fuel.

[0355] The heating unit (2g) can control the temperature of the liquid fuel. The load of the heating unit (2g) can be adjusted according to the temperature required by the demand source (14). The temperature required by the demand source (14) can be a preset value. In addition, the load of the heating unit (2g) can be adjusted according to the internal condition of the fuel tank (2).

[0356] The heating unit (2g) can have its load controlled by a control unit (not shown). The control unit can control the operation of the heating unit (2g) according to the required temperature of the demand source (14) or the internal pressure or temperature of the fuel tank (2). The internal pressure or temperature of the fuel tank (2) can be measured by a temperature sensor or pressure sensor provided in the fuel tank (2).

[0357] Referring to Fig. 21, the fuel tank (2) may further include a second storage section (2b) that is isolated from the first storage section (2a) by a bulkhead (2c) and stores a second fuel having a relatively high boiling point.

[0358] Referring to FIG. 21, the liquid fuel processing system (10) is provided outside the fuel tank (2) and may further include a second fuel transfer pump (DP) for transferring the second fuel.

[0359] It may further include a communication portion (2d) that opens at least a portion of the above-mentioned bulkhead (2c) to connect the first storage portion (2a) and the second storage portion (2b).

[0360] The above second storage unit (2b) may be formed as an empty space when storing the first fuel in the above first storage unit (2a).

[0361] Referring to FIG. 22, the fuel tank (2) further includes an isolation section (2e) provided in the first storage section (2a) and surrounding the first fuel transfer pump (LP), and the isolation section (2e) can isolate the first fuel transfer pump (LP) from the second fuel when the second fuel is stored in the first storage section (2a).

[0362] Referring to FIG. 23, the fuel tank (2) further includes a housing body (2f1) having one end extending from one side of the fuel tank (2) and the other end having an opening; and a housing cover (2f2) that blocks the opening of the housing body (2f1); and the housing cover (2f2) can isolate a first fuel transfer pump (LP) disposed inside the housing body (2f1) from the second fuel when storing the second fuel in the first storage section (2a).

[0363] Referring to FIG. 24, the fuel tank (2) further includes a pump casing (PC) provided in the second storage section (2b) and surrounding the first fuel transfer pump (LP), and the pump casing (PC) can isolate the first fuel transfer pump (LP) from the second fuel when the second fuel is stored in the first storage section (2a).

[0364] Referring to Fig. 26, the heating unit (2g) may be provided in the second storage unit (2b).

[0365] The above fuel supply unit (3) may include a temperature control unit (TC) that controls the temperature of the liquid fuel in response to the required temperature of the demand source (14).

[0366]

[0367] Figure 27 is a conceptual diagram for explaining a liquid fuel processing system according to the 14th embodiment of the present invention.

[0368] Referring to FIG. 27, a liquid fuel processing system (10) according to a 14th embodiment of the present invention includes a fuel tank (2) that stores one of a first fuel and a second fuel having different boiling points; a fuel supply unit (3) that supplies the liquid fuel received from the fuel tank (2) to a demander (14); and the fuel tank (2) includes a heating unit (2g) provided inside the fuel tank (2); and the fuel supply unit (3) includes a temperature control unit (TC) that controls the temperature of the liquid fuel in response to a required temperature of the demander (14); and may include a control unit (not shown) that controls the operation of the heating unit (2g) and the temperature control unit (TC) according to the internal state of the fuel tank (2).

[0369] The heating unit (2g) may be provided inside the fuel tank (2). The temperature control unit (TC) may be provided between the fuel tank (2) and the demand source (14). Specifically, the temperature control unit (TC) may be provided downstream of the fuel tank (2) or the heating unit (2g). The temperature control unit (TC) may be a shell & tube type heat exchanger, a shell & plate type heat exchanger, or a water bath type heat exchanger, but the present invention is not limited thereto.

[0370] The heating unit (2g) and the temperature control unit (TC) can be operated in consideration of the pressure and temperature inside the fuel tank (2). For example, when the pressure inside the fuel tank (2) is above a certain pressure, the operation of the heating unit (2g) can be relatively reduced and the operation of the temperature control unit (TC) can be relatively increased to prevent the pressure in the fuel tank (2) from further increasing.

[0371] At this time, the control unit can control the operation of the heating unit (2g) and the temperature control unit (TC) according to the internal pressure or temperature of the fuel tank (2). A sensor such as a temperature sensor or a pressure sensor may be provided in the fuel tank (2). The control unit can control the operation of the heating unit (2g) or the temperature control unit (TC) based on the internal pressure or temperature of the fuel tank (2) measured by the sensor.

[0372] The above control unit can relatively increase the operating load of the heating unit (2g) when the internal pressure of the fuel tank (2) is lower than the reference pressure, and can relatively increase the operating load of the temperature control unit (TC) when the internal pressure of the fuel tank (2) is higher than the reference pressure. Although not limited thereto, the reference pressure here may be a midpoint between the upper and lower limits of the design pressure of the fuel tank (2). The control unit can operate the heating unit (2g) so that the internal pressure of the fuel tank (2) is maintained at the reference pressure. At this time, the control unit can adjust the operating load of the temperature control unit (TC) so that the liquid fuel delivered from the fuel tank (2) to the demander (14) becomes the temperature required by the demander (14). For example, if the amount of liquid fuel stored in the fuel tank (2) is small, the control unit increases the load of the heating unit (2g) to maintain the internal pressure of the fuel tank (2) at the reference pressure, so that the liquid fuel inside the fuel tank (2) may become hot. At this time, the control unit can reduce the operating load of the temperature control unit (TC) so that the liquid fuel reaches the temperature required by the demander (14).

[0373] The above control unit can stop the operation of the temperature control unit (TC) when the internal pressure of the fuel tank (2) is lower than the first preset pressure. Here, the first preset pressure can be the lower limit of the design pressure of the fuel tank (2). At this time, the control unit can increase the operating load of the heating unit (2g).

[0374] The above control unit can stop the operation of the heating unit (2g) when the internal pressure of the fuel tank (2) is higher than the second preset pressure. Here, the second preset pressure can be the upper limit of the design pressure of the fuel tank (2). At this time, the control unit can reduce the operating load of the heating unit (2g).

[0375] That is, the control unit can operate the heating unit (2g) so that the internal pressure of the fuel tank (2) is maintained between the upper and lower limits of the design pressure, and increase the operating load of the temperature control unit (TC) so that the liquid fuel delivered from the fuel tank (2) to the demander (14) has the required temperature of the demander (14).

[0376] The above control unit can relatively increase the operating load of the heating unit (2g) when the temperature of the fuel tank (2) is lower than the reference temperature, and can relatively increase the operating load of the temperature control unit (TC) when the temperature of the fuel tank (2) is higher than the reference temperature. Although not limited, the reference temperature here may be a midpoint between the temperature that becomes the upper limit of the design pressure of the fuel tank (2) and the temperature that becomes the lower limit of the design pressure. In this case, the control unit can increase the operating load of the heating unit (2g).

[0377] The control unit can operate the heating unit (2g) so that the temperature of the fuel tank (2) is maintained at a reference temperature. At this time, the control unit can adjust the operating load of the temperature control unit (TC) so that the liquid fuel delivered from the fuel tank (2) to the demander (14) has a temperature required by the demander (14). For example, if the amount of liquid fuel stored in the fuel tank (2) is large, the control unit reduces the load of the heating unit (2g) so that the internal pressure of the fuel tank (2) is maintained at a reference pressure, so that the liquid fuel inside the fuel tank (2) can have a low temperature. At this time, the control unit can increase the operating load of the temperature control unit (TC) so that the liquid fuel has a temperature required by the demander (14).

[0378] In addition, the control unit can block the transfer of the liquid fuel from the fuel tank (2) to the temperature control unit (TC) when the temperature of the liquid fuel in the fuel tank (2) is higher than the reference temperature. For example, the control unit can control the opening and closing of a valve (not shown) provided in the fuel tank (2) or the fuel supply line (L1). Of course, the control unit can control a part of the liquid fuel to be transferred from the fuel tank (2) to the temperature control unit (TC) and the remaining part of the liquid fuel to bypass the temperature control unit (TC). In other words, the control unit can control the flow rate of the liquid fuel transferred to the temperature control unit (TC).

[0379] The fuel supply unit (3) may include a bypass line (BL) formed by branching off from the fuel supply line (L1) upstream of the temperature control unit (TC). The liquid fuel may bypass the temperature control unit (TC) along the bypass line (BL).

[0380] In addition, the control unit can control the liquid fuel supplied to the demand source (14) to bypass the temperature control unit (TC) when the internal pressure of the fuel tank (2) is lower than the first preset pressure. At this time, the control unit can increase the operating load of the heating unit (2g).

[0381] In addition, the control unit can control the heating unit (2g) to heat the liquid fuel to a minimum reference temperature or higher. Here, the minimum reference temperature may mean the lowest value of the temperature at which the liquid fuel flowing into the temperature control unit (TC) can reach the required temperature of the demander (14) when passing through the temperature control unit (TC). For example, the minimum reference temperature may mean the temperature at which the temperature of the liquid fuel downstream of the temperature control unit (TC) reaches the required temperature of the demander (14) when the temperature control unit (TC) is operated at maximum load.

[0382]

[0383] Figure 28 is a conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 15th embodiment of the present invention.

[0384] Referring to Fig. 28, a liquid fuel propulsion vessel (1a) may include a hull (11), an engine room (13), a demand location (14), a cabin (15), an engine casing (16), a lashing bridge (17), a fuel tank (2), etc. In addition, the liquid fuel propulsion vessel (1a) may include a fuel supply section (3), a bunkering section (5), a pump room (6), a cofferdam (7), and may include various other configurations in addition to these configurations.

[0385] The hull (11) is composed of a top deck (111), a side shell (112), a bottom plate (113), a bow (114), and a stern (115), and forms the exterior of a liquid fuel propulsion vessel (1a). In addition, the liquid fuel propulsion vessel (1a) is a container carrier, and the hull (11) includes a plurality of holds (116) for loading containers (C) therein. Of course, the liquid fuel propulsion vessel (1a) may be a crude oil carrier. At least one hold (116) may be provided on the hull (11). For example, the hold (116) may include a first hold (1161) provided at the center of the hull (11) and a second hold (1162) provided adjacent to the stern (115), but the present invention is not limited by the position of the hold. Additionally, the first hold (1161) may include a first area (1161a) in which a fuel tank (2) is provided and a second area (1161b) separated from the first area (1161b).

[0386] The fuel tank (2) may be surrounded by a cofferdam (7). A pump room (6) and a cofferdam (7) may be arranged on the upper part of the fuel tank (2), and a cabin (15) may be provided on the upper part of the pump room (6), but the present invention is not limited thereto.

[0387] Although the drawing shows that the fuel tank (2) is arranged in the hold (116), the hold (116) itself can constitute a fuel tank (2). That is, the hold (116) can directly store liquid fuel. Accordingly, the hold (116) may be loaded with a fuel tank (2) so that the fuel tank (2) stores liquid fuel, or the hold (116) can directly store liquid fuel. In this case, the first region (1161a) can store liquid fuel. However, the present invention is not limited by whether the fuel tank (2) is installed in the hold (116).

[0388] The demand source (14) can be placed in the engine room (13) and can include a first demand source (141) and a second demand source (142).

[0389] The cabin (15) can be provided in the central part of the upper deck (111).

[0390] The engine casing (16) can be provided on the upper deck (111) above the engine room (13).

[0391] A lashing bridge (17) may be provided to load a container (C) on the upper deck (111) of the hull (11).

[0392] The fuel tank (2) may include a fuel storage tank (21) for storing and preserving liquid fuel, and a fuel supply tank (22) for delivering liquid fuel supplied from the fuel storage tank (21) to a fuel supply unit (3).

[0393] A fuel storage tank (21) may be provided in the hull (11). The fuel storage tank (21) may be provided in the lower part of the cabin (15) in the central part of the hull (11) and may be surrounded by a cofferdam (7). In addition, the fuel storage tank (21) may be provided inside the hull (11) adjacent to the engine room (13), or may be provided on the upper deck (111), etc., but the present invention is not limited thereto.

[0394] The fuel supply tank (22) may be provided in the engine casing (16). In addition, the fuel supply tank (22) may be provided inside the hull (11) adjacent to the engine room (13), but the present invention is not limited thereto.

[0395]

[0396] Figure 29 is an enlarged view of part “A” to explain the hold of the vessel shown in Figure 28.

[0397] Referring to FIG. 29, the liquid fuel processing system (10) according to the 15th embodiment of the present invention may include a holding wall (1161c) that divides the internal space of at least one of the holds (116) into a plurality of regions along the front-back direction. The holding wall (1161c) may divide the internal space of the hold (116) into a first region (1161a) positioned at the front and a second region (1161b) positioned at the rear. Accordingly, the hold (116) may include a first region (1161a) and a second region (1161b) separated from the first region (1161a) by the holding wall (1161c).

[0398] The hold (116) may extend to a height adjacent to the upper deck (111). The hold (116) faces the upper deck (111) with the pump room (6) as the boundary. For example, the hold (116) may be in contact with the lower surface of the pump room (6), and the upper deck (111) may be in contact with the upper surface of the pump room (6). In addition, the hold (116) may extend to the lower surface of the upper deck (111). The first region (1161a) of the hold (116) may have a height greater than the length in the forward / rear direction. When a fuel tank (2) is installed in the hold (116), the height of the fuel tank (2) may be at least 50%, 60%, 70%, 80%, or 90% of the height of the hold (116).

[0399] The second region (1161b) may include outer tanks (VT) arranged on the left and right sides of the hull (11). The outer tanks (VT) may be arranged on the left and right sides of the hull (11). The outer tanks (VT) may store first fuel or second fuel. In addition, the second region (1161b) may further include a loading section (LD) provided between a pair of outer tanks (VT) and on which a container (C) is loaded. The outer tanks (VT) may be provided on the left and right sides of the loading section (LD).

[0400]

[0401] Fig. 30 is a cross-sectional view taken along the “B” portion to explain the first region of the hold illustrated in Fig. 29.

[0402] Referring to FIG. 30, a liquid fuel processing system (10) according to a 15th embodiment of the present invention includes a plurality of holds (116) provided along the longitudinal direction of a hull (11); a bulkhead (2c) dividing the internal space of at least one of the holds (116) into a plurality of separation spaces (2h) along the left-right direction; and a separation part (2j) having an openable and closable structure that divides the separation space (2h) into a plurality of fuel spaces (2i), wherein the separation part (2j) can be opened when the first fuel among the first fuel and the second fuel having different boiling points is stored in the separation space (2h), and can be closed when the second fuel is stored in the separation space (2h).

[0403] For example, when the first fuel is stored in a separation space (2h), multiple fuel spaces (2i) may be interconnected. In this case, the separation spaces (2h) may form an integrated storage space. Conversely, when the second fuel is stored in a separation space (2h), multiple fuel spaces (2i) may be separated from each other.

[0404] The above separation section (2j) can be opened when a first fuel having a relatively low boiling point is stored in the separation space (2h), and can be closed when a second fuel having a relatively high boiling point is stored in the separation space (2h), so that the volume of the fuel space (2i) in which the second fuel is stored can be within a preset value. When the second fuel is stored in the separation space (2h), at least a portion of the fuel space (2i) can be maintained as an empty space. For example, when the second fuel is stored in the separation space (2h), the fuel spaces (2i) provided at both left and right ends of the hull (11) can be maintained as an empty space.

[0405] The hold (116) may include a first storage section (2a) for storing either a first fuel or a second fuel having different boiling points; and a second storage section (2b) separated from the first storage section (2a) by a separator (2j) for storing the first fuel having a relatively lower boiling point. When the second fuel is stored in the separation space (2h), the second storage sections (2b) provided at both left and right ends of the hull (11) may be maintained as empty spaces. At this time, the first storage section (2a) provided at the center of the hull (11) may be filled with the second fuel.

[0406] The bulkhead (2c) can separate the interior of the hold (116). Specifically, the bulkhead (2c) can separate the interior space of the fuel tank (2) in the left and right directions of the fuel tank (2). The bulkhead (2c) can be arranged in a direction perpendicular to the lower surface of the fuel tank (2). The bulkhead (2c) can be arranged at the center of the hold (116). However, the present invention is not limited by the arrangement direction of the bulkhead (2c).

[0407] The separation unit (2j) can separate the separation space (2h) into multiple fuel spaces (2i). For example, each fuel space (2i) of the separation space (2h) is 500 m 3 3,000m inland 3 The second storage unit (2b) may be separated to have a volume of , and on the other hand, the second storage unit (2b) may have a smaller volume than the first storage unit (2a). The fuel spaces (2i) may store different fuels in each space. For example, at least some of the fuel spaces (2i) may store the first fuel, and the remaining some of the fuel spaces (2i) may store the second fuel. A cofferdam (7) may be provided between the fuel spaces (2i), but the present invention is not limited thereto.

[0408] In order to reduce the amount of fuel leaked in the event of a leak in one fuel space (2i), the volume of fuel stored in one fuel space (2i) may be limited. At this time, the volume of each fuel space (2i) may be determined according to the fuel stored therein. For example, in the event that a second fuel is stored in the fuel space (2i), the volume of one fuel space (2i) may be 2,500 m 3 It may be limited to the following:

[0409] The volume of the above fuel space (2i) can be determined by the partition of the separator (2j). For example, if the second fuel with a relatively high boiling point is stored, the fuel space (2i) has a volume of 2,500 m 3 The above separation unit (2j) can separate the above separation space (2h) into a plurality of fuel spaces (2i) so that the following is provided. In addition, the fuel space (2i) has a volume of 2,500 m when a first fuel with a relatively low boiling point is stored. 3 It can be larger. Since the above separation part (2j) can partition the above separation space (2h), the hold (116) can store either the first fuel or the second fuel.

[0410] The fuel tank (2) may further include a communication portion (2d) that opens at least a portion of the separating portion (2j) to connect the fuel spaces (2i) with each other. The communication portion (2d) may be provided in the separating portion (2j). The communication portion (2d) may be arranged at the lower portion of the hold (116). The communication portion (2d) may open or block at least a portion of the separating portion (2j). Liquid fuel may move through the communication portion (2d) provided in the separating portion (2j). The communication portion (2d) may be applied without limitation as long as it can block the movement of the liquid fuel, such as a valve. The area where the liquid fuel is stored may be limited by the communication portion (2d).

[0411] Primary fuel may generate less heat than secondary fuel. For a liquid fuel-powered vessel (1a) to operate the same distance, primary fuel must be loaded in greater quantities than secondary fuel. Therefore, primary fuel may be loaded in quantities more than twice that of secondary fuel.

[0412] The liquid fuel stored in the fuel tank (2) can be changed to another liquid fuel. At this time, since the first fuel has a lower calorific value than the second fuel, the second fuel can be loaded with a smaller capacity than the first fuel. When the first fuel stored in the fuel tank (2) is changed to the second fuel, the second fuel can be stored only in the first storage section (2a). At this time, the communication section (2d) can be closed, so that the fuel spaces (2i) can be separated from each other. In addition, the second storage section (2b) filled with the first fuel can be formed as an empty space. In addition, the second fuel

[0413] Conversely, the second fuel stored in the fuel tank (2) may be changed to the first fuel. At this time, since the first fuel has a lower calorific value than the second fuel, the first fuel may be loaded with a larger capacity than the second fuel. When the second fuel stored in the fuel tank (2) is changed to the first fuel, the fuel space (2i) separated from the first storage unit (2a) by the separator (2j) may be changed to store the first fuel, and the second storage unit (2b), which was comprised of an empty space, may also be changed to store the first fuel. At this time, the fuel spaces (2i) may be connected to each other. For example, the fuel space (2i) changed to store the first fuel and the second storage unit (2b) may be connected to each other by opening the communication unit (2d).

[0414] That is, when the second fuel stored in the fuel tank (2) is changed to the first fuel, the fuel space (2i) formed by separating the first storage unit (2a) by the separator (2j) is changed to store at least a portion of the first fuel, and the second storage unit (2b) which was made up of empty space can be changed to store the first fuel.

[0415] Only a portion of the fuel space (2i) may be changed from the secondary fuel to the primary fuel. For example, the fuel space (2i) arranged on the left side of the hull (11) may be maintained as the secondary fuel, and the fuel space (2i) arranged on the right side of the hull (11) may be changed from the secondary fuel to the primary fuel.

[0416] Of course, when the fuel space (2i) is empty, the first fuel or the second fuel can be injected into the fuel space (2i). In this case, the connecting portion (2d) can be opened and closed depending on the fuel injected into the fuel space (2i).

[0417]

[0418] Fig. 31 is a cross-sectional view taken along the “C” portion to explain the second region of the hold illustrated in Fig. 29.

[0419] Referring to FIG. 31, the liquid fuel processing system (10) is provided in a second area (1161b) of the internal space of the hold (116), and may include an outer tank (VT) arranged on the left and right sides of the hull (11). The outer tank (VT) may be provided in the second area (1161b) of the first hold (1161). The outer tank (VT) may be arranged on the left and right sides of the hull (11).

[0420] The outer tank (VT) can store the first fuel or the second fuel. The outer tank (VT) can be kept empty in some cases. Multiple outer tanks (VT) can store different fuels, respectively. The outer tank (VT) can be supplementally filled when the storage space of the first region (1161a) is insufficient, but the present invention is not limited thereto. In addition, when the liquid fuel of the first region (1161a) is exhausted, the first fuel or the second fuel stored in the outer tank (VT) can be supplied to the demand source (14), but the present invention is not limited thereto.

[0421] The outer tank (VT) may have a stepped bottom. By having the lower part of the outer tank (VT) be configured in a stepped shape, the lower part of the outer tank (VT) and the stepped portion (not shown) of the hold (116) are arranged so as not to be misaligned, thereby enhancing structural stability.

[0422] The liquid fuel processing system (10) may further include a loading section (LD) provided between a pair of outer tanks (VT) in the second area (1161b) of the internal space of the hold (116) and in which a container (C) is loaded. The outer tanks (VT) may be provided on the left and right of the loading section (LD). Liquid fuel may not be stored in the central area of ​​the second area (1161b).

[0423] In this way, the liquid fuel processing system (10) according to the 15th embodiment of the present invention separates the hold (116) in the left-right direction of the hull (11), and can change the opening and closing of the separating part (2j) that separates the internal space of the hold (116) according to the fuel stored in the hold (116). Accordingly, the liquid fuel can be efficiently stored in the hold (116).

[0424] A loading area (LD) for loading containers may be provided in the second area (1161b). Accordingly, compared to a ship (1a) in which a fuel tank (2) is provided in the second area (1161b), containers of 200 TEU or more may be additionally loaded in the loading area (LD).

[0425] Meanwhile, the liquid fuel processing system (10) is disposed above the outer tank (VT) and may further include a bunkering unit (5) that transfers liquid fuel from the outside to the fuel tank (2) or the outer tank (VT). However, the present invention is not limited thereto.

[0426] Figure 32 is an enlarged view of the “D” portion to explain the hold of the vessel shown in Figure 28.

[0427] A gap (G) may be provided in the hold (116). The gap (G) may not only divide the internal space of the hold (116) into front and rear, but may also separate the hold (116) into front and rear within the hull (11). The gap (G) separating the hold (116) into front and rear may be formed as a sealed bulkhead.

[0428] An outer tank (VT) may be provided in the gap (G). This may encompass the gap (G) itself becoming an outer tank (VT). If the fuel tank (2) provided in the first area (1161a) and the outer tank (VT) provided in the second area (1161b) are sufficiently filled with liquid fuel necessary for the operation of the ship (1a), the gap (G) may not be filled with liquid fuel. In addition, the gap (G) itself that divides the holds (116) from each other may be omitted.

[0429]

[0430] Figure 33 is a first conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 16th embodiment of the present invention.

[0431] Referring to FIG. 33, a liquid fuel processing system (10) according to a 16th embodiment of the present invention includes a fuel tank (2) for storing liquid fuel of one of first fuel and second fuel having different boiling points; a cleaning unit (100) for supplying a cleaning medium to the fuel tank (2); and a collection tank (ST) for collecting wastewater generated from a hull (11). The collection tank (ST) can store liquid fuel discharged from the fuel tank (2) together with the cleaning medium. The collection tank (ST) may be a slop tank, but is not limited thereto.

[0432] The cleaning unit (100) can supply a cleaning medium to the fuel tank (2) before replacing the first fuel or the second fuel in the fuel tank (2) with a liquid fuel having a different boiling point. Specifically, the cleaning unit (100) can supply the cleaning medium from the upper portion of the fuel tank (2). The cleaning unit (100) can prevent the first fuel and the second fuel from being mixed in the fuel tank (2). For example, the first fuel may be methanol or ethanol, and the second fuel may be diesel or heavy oil, but the present invention is not limited thereto.

[0433] In addition, the cleaning unit (100) may supply a cleaning medium to the fuel tank (2) before supplying liquid fuel to the fuel tank (2), but the present invention is not limited thereto.

[0434] The liquid fuel discharged from the fuel tank (2) together with the cleaning medium can be transferred to the collection tank (ST) by gravity. The first fuel or the second fuel can be discharged to the collection tank (ST) together with the cleaning medium by gravity. The collection tank (ST) can be arranged below the fuel tank (2). The liquid fuel discharged from the fuel tank (2) together with the cleaning medium can be transferred to the collection tank (ST) along the collection line (L9).

[0435] The above cleaning unit (100) can supply a cleaning medium to the fuel tank (2) using a feed water pump (SP) provided at the rear of the hull. Here, the cleaning medium may be water, and is not limited to fresh water or seawater. The feed water pump (SP) is placed on the deck inside the engine room (13) and can pump seawater from a sea chest (not shown) through a seawater supply line, or pump fresh water from a fresh water tank (FWT) to supply a cleaning medium to the fuel tank (2).

[0436] The cleaning unit (100) is shown as being fixed to the fuel tank (2), but the cleaning unit (100) may be of a fixed type as well as a mobile type. In this case, the cleaning unit (100) may be of a portable type, which can be carried by a worker while supplying the cleaning medium. However, the present invention is not limited thereto.

[0437] The cleaning unit (100) can supply a cleaning medium to the fuel tank (2) along the cleaning line (L8). The cleaning line (L8) can be connected to a bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Therefore, the cleaning unit (100) can supply the cleaning medium to the fuel tank (2) along the bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Specifically, the cleaning unit (100) can supply the cleaning medium to the fuel tank (2) along the first fuel bunkering line (L4a) that transfers first fuel from the outside to the fuel tank (2).

[0438] In addition, the cleaning line (L8) may be connected to the fuel supply line (L1) that transfers liquid fuel from the fuel tank (2) to the demander (14). The cleaning unit (100) may supply a cleaning medium to the fuel tank (2) along the fuel supply line (L1) that transfers liquid fuel from the fuel tank (2) to the demander (14), but the present invention is not limited thereto.

[0439]

[0440] Figure 34 is a second conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 16th embodiment of the present invention.

[0441] Referring to Fig. 34, the collection tank (ST) can collect a mixture of a cleaning medium that has cleaned the fuel tank (2) and liquid fuel. The liquid fuel may have a property of being dissolved or mixed in the cleaning medium. For example, the first fuel may have a property of being dissolved in water. The first fuel may be discharged to the collection tank (ST) through the cleaning pump (CP) together with the cleaning medium. The first fuel transfer pump (LP) may be used as the cleaning pump (CP), and the first fuel may be discharged to the collection tank (ST) through the first fuel transfer pump (LP).

[0442] The above collection tank (ST) may include a first collection tank (ST1) that collects liquid fuel discharged from the fuel tank (2) together with a cleaning medium; and a second collection tank (ST2) that is isolated from the first collection tank (ST1) by a bulkhead (ST3). The first collection tank (ST1) may be connected to the fuel tank (2) by a collection line (L9).

[0443] The first collection tank (ST1) and the second collection tank (ST2) can be connected by a center line (CL). Liquid fuel and cleaning medium can flow along the center line (CL). The center line (CL) is connected to the first collection tank (ST1) above a certain height, and the center line (CL) is connected to the second collection tank (ST2) below a certain height.

[0444] When the first fuel of the fuel tank (2) is discharged to the collection tank (ST), the first fuel may be delivered to the collection tank (ST) in a state dissolved in a cleaning medium. Specifically, the first fuel and the cleaning medium may be delivered to the first collection tank (ST1).

[0445] The collection tank (ST) can store a mixture of primary fuel and cleaning medium for a certain period of time. During this time, foreign substances settle to the bottom of the primary collection tank (ST1), and the primary fuel and cleaning medium can be collected at the upper portion of the primary collection tank (ST1) due to density differences. The primary fuel and cleaning medium collected at the upper portion of the primary collection tank (ST1) can be transferred to the secondary collection tank (ST2) along the centerline (CL).

[0446] As the cleaning of the fuel tank (2) continues, the first fuel remaining in the fuel tank (2) may decrease. Accordingly, the concentration of the first fuel in the mixture of the first fuel and the cleaning medium delivered to the collection tank (ST) may decrease. When the concentration of the first fuel in the collection tank (ST) becomes lower than a preset value, the first fuel may be discharged from the collection tank (ST). The first fuel may be processed in the hull (11) or discharged outside the hull (11).

[0447] The liquid fuel processing system (10) may further include a control unit (not shown) that discharges the liquid fuel to the outside together with the cleaning medium when the concentration of the liquid fuel in the collection tank (ST) is below a preset value.

[0448] The secondary fuel can be discharged to the collection tank (ST) together with the cleaning medium through the cleaning pump (CP). The secondary fuel transfer pump (DP) can be used as the cleaning pump (CP), and the secondary fuel can be discharged to the collection tank (ST) through the secondary fuel transfer pump (DP). When the secondary fuel in the fuel tank (2) is discharged to the collection tank (ST), the secondary fuel can be delivered to the collection tank (ST) together with the cleaning medium. Specifically, the secondary fuel and the cleaning medium can be delivered to the first collection tank (ST1).

[0449] The collection tank (ST) can store a mixture of secondary fuel and cleaning medium for a certain period of time. At this time, the collection tank (ST) can separate the mixture of the cleaning medium and secondary fuel. Foreign substances and secondary fuel settle to the bottom of the first collection tank (ST1), and the cleaning medium can collect at the top of the first collection tank (ST1) due to the difference in density. The collection tank (ST) may be an oil-water separator.

[0450] The cleaning medium separated from the second fuel in the first collection tank (ST1) can move to the second collection tank (ST2) along the center line (CL). The second collection tank (ST2) can collect the cleaning medium separated from the liquid fuel due to the difference in density. The center line (CL) can be connected to the first collection tank (ST1) above a certain height. The cleaning medium in the upper portion of the first collection tank (ST1) can be transferred to the second collection tank (ST2) along the center line (CL). The center line (CL) can be connected to the second collection tank (ST2) below a certain height, but the present invention is not limited thereto.

[0451] Secondary fuel may remain in the first collection tank (ST1) along with foreign substances. Secondary fuel may be processed in the hull (11) or discharged outside the hull (11). Secondary fuel may be discharged outside via a second fuel transfer pump (DP).

[0452] The cleaning medium collected in the second collection tank (ST2) is processed in the hull (11) or discharged outside the hull (11). The cleaning medium can be discharged outside the hull (11) by a transfer pump (P) or a cargo pump (not shown) that transfers cargo to the outside of the hull (11).

[0453]

[0454] FIG. 35 is a third conceptual diagram of a vessel for explaining a cleaning section of a liquid fuel processing system according to the 16th embodiment of the present invention.

[0455] Referring to Fig. 35, the cleaning unit (100) can supply cleaning medium to the fuel tank (2) along the cleaning line (L8). The cleaning unit (100) can supply cleaning medium to the upper portion of the fuel tank (2).

[0456]

[0457] The cleaning line (L8) may be connected to a bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Accordingly, the cleaning unit (100) may supply a cleaning medium to the fuel tank (2) along the bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Specifically, the bunkering line (L4) may be connected to the upper portion of the fuel tank (2). Here, the cleaning line (L8) may mean the same line as the bunkering line (L4).

[0458] The above cleaning unit (100) can supply a cleaning medium to the fuel tank (2) along a first fuel bunkering line (L4a) that transfers first fuel from the outside to the fuel tank (2). The cleaning medium can be supplied from the upper portion of the fuel tank (2) along the first fuel bunkering line (L4a).

[0459] The first fuel may be discharged to the collection tank (ST) through the first fuel transfer pump (LP) together with the cleaning medium, and the second fuel may be discharged to the collection tank (ST) through the second fuel transfer pump (DP) together with the cleaning medium.

[0460] The first fuel may be discharged to the outside along the first fuel manifold (not shown) through the first fuel transfer pump (LP) together with the cleaning medium, and the second fuel may be discharged to the outside along the second fuel manifold (not shown) through the second fuel transfer pump (DP) together with the cleaning medium. The first fuel manifold or the second fuel manifold may be configured to transfer external liquid fuel to the fuel tank (2) or to transfer liquid fuel from the fuel tank (2) to the outside. The manifold may include a flange connected to a loading arm or the like provided on land. The manifold may be provided at the central portion in the longitudinal direction of the hull (11). The manifold may be installed on the bottom surface of the bunkering section (5), but the present invention is not limited thereto.

[0461] The first fuel transfer pump (LP) and the second fuel transfer pump (DP) can be used to supply liquid fuel stored in the fuel tank (2) to a demander (14), to supply liquid fuel stored in the fuel storage tank (21) to a fuel supply tank (22), to transfer liquid fuel stored in the fuel tank (2) to the outside of the hull (11), or to supply liquid fuel from the outside to the fuel tank (2), but the present invention is not limited thereto.

[0462] The above first fuel manifold (not shown) may be a gaseous manifold.

[0463] The first fuel manifold may be connected to a first fuel bunkering line (L4a). The first fuel, together with a cleaning medium, may be discharged outside the hull (11) along the first fuel bunkering line (L4a). The first fuel bunkering line (L4a) may be a vapor line.

[0464] The secondary fuel manifold may be connected to a secondary fuel bunkering line (L4b). The secondary fuel together with the cleaning medium may be discharged outside the hull (11) along the secondary fuel bunkering line (L4b).

[0465] The second fuel manifold (not shown) may be provided on the upper side of the engine room (13). The second fuel manifold (not shown) may be provided on one side of the engine casing (16) arranged on the upper side of the engine room (13). In addition, the second fuel manifold (not shown) may be provided on one side of the cabin (15), but the present invention is not limited thereto.

[0466] A liquid fuel processing system (10) according to the 16th embodiment of the present invention supplies a cleaning medium to a fuel tank (2) through a first fuel manifold through which first fuel is delivered from the outside to the fuel tank (2), and the first fuel can deliver a mixture of the first fuel and the cleaning medium to the outside using a first fuel transfer pump (LP), and the second fuel can deliver a mixture of the second fuel and the cleaning medium to the outside using a second fuel transfer pump (DP).

[0467]

[0468] Figure 36 is a first conceptual diagram of a cleaning unit of a liquid fuel processing system according to one embodiment of the present invention.

[0469] Referring to FIG. 36, the cleaning unit (100) may further include an injection unit (110) that injects at least a portion of the cleaning medium into the fuel tank (2). The injection unit (110) may be positioned at the top of the fuel tank (2). The injection unit (110) may inject the cleaning medium into the interior of the fuel tank (2).

[0470] The above cleaning unit (100) further includes an eductor (120) that sucks in liquid fuel from the fuel tank (2), and the cleaning medium remaining after being sprayed from the spray unit (110) can be transferred to the eductor (120).

[0471] The above eductor (120) can discharge the liquid fuel remaining at the bottom of the fuel tank (2) together with the cleaning medium into the collection tank (ST) using the pressure of the cleaning medium as a driving force. In addition, the remaining liquid fuel can be discharged to the outside of the hull (11). The first fuel can be discharged to the outside of the collection tank (ST) or the hull (11) together with the cleaning medium through the first fuel transfer pump (LP), and the second fuel can be discharged to the outside of the collection tank (ST) or the hull (11) together with the cleaning medium through the second fuel transfer pump (DP).

[0472] The injection unit (110) may be provided in the cleaning line (L8), and the eductor (120) may be provided in the collection line (L9), but the present invention is not limited thereto. The cleaning line (L8) and the collection line (L9) may pass through at least a portion of the interior of the fuel tank (2).

[0473]

[0474] Figure 37 is a second conceptual diagram of a cleaning unit of a liquid fuel processing system according to one embodiment of the present invention.

[0475] Referring to Fig. 37, the cleaning unit (100) further includes a stripping pump (130) provided inside the fuel tank (2), and the stripping pump (130) can discharge the liquid fuel remaining at the bottom of the fuel tank (2) together with the cleaning medium into the collection tank (ST). In addition, the remaining liquid fuel can be discharged to the outside of the hull (11).

[0476] The first fuel may be discharged to the outside of the collection tank (ST) or the hull (11) through the first fuel transfer pump (LP) together with the cleaning medium, and the second fuel may be discharged to the outside of the collection tank (ST) or the hull (11) through the second fuel transfer pump (DP) together with the cleaning medium.

[0477]

[0478] The liquid fuel processing system according to the 16th embodiment of the present invention may be installed in a crude oil carrier, but the present invention is not limited thereto.

[0479]

[0480] Figure 38 is a conceptual diagram of a vessel for explaining a liquid fuel processing system according to the 17th embodiment of the present invention.

[0481] Referring to FIG. 38, a liquid fuel processing system (10) according to a 17th embodiment of the present invention includes a fuel tank (2) that stores one of first and second fuels having different boiling points; a fuel supply unit (3) that supplies the liquid fuel received from the fuel tank (2) to a demander (14); a cleaning unit (100) that supplies a cleaning medium to the fuel tank (2); and a transfer pump (P) that transfers the liquid fuel of the fuel tank (2) to the demander (14), wherein the transfer pump (P) can discharge the liquid fuel of the fuel tank (2) together with the cleaning medium.

[0482] The cleaning unit (100) can supply a cleaning medium to the fuel tank (2) before replacing the first fuel or the second fuel of the fuel tank (2) with a liquid fuel having a different boiling point. In addition, the cleaning unit (100) can supply a cleaning medium to the fuel tank (2) before injecting liquid fuel into the fuel tank (2).

[0483] The liquid fuel processing system (10) may further include a control unit (not shown) that discharges the liquid fuel to the outside together with the cleaning medium when the concentration of the liquid fuel in the fuel tank (2) is below a preset value.

[0484] The liquid fuel processing system (10) further includes a collection tank (ST) for collecting wastewater generated from the hull (11), and the collection tank (ST) can store liquid fuel discharged from the fuel tank (2) together with a cleaning medium. The first fuel can be discharged to the collection tank (ST) through a first fuel transfer pump (LP) together with the cleaning medium, and the second fuel can be discharged to the collection tank (ST) through a second fuel transfer pump (DP) together with the cleaning medium.

[0485] The above collection tank (ST) can be placed in an upward direction compared to the above fuel tank (2).

[0486] The above cleaning unit (100) can supply a cleaning medium to the fuel tank (2) using a feed water pump (SP) provided at the rear of the hull (11). Here, the cleaning medium may be water, and is not limited to fresh water or seawater. The feed water pump (SP) is placed on the deck inside the engine room (13) and can pump seawater from a sea chest (not shown) through a seawater supply line, or pump fresh water from a fresh water tank (FWT) to supply a cleaning medium to the fuel tank (2).

[0487] The cleaning unit (100) is shown as being fixed to the fuel tank (2), but the cleaning unit (100) may be of a fixed type as well as a mobile type. In this case, the cleaning unit (100) may be of a portable type, which can be carried by a worker while supplying the cleaning medium. However, the present invention is not limited thereto.

[0488] The cleaning unit (100) can supply cleaning medium to the fuel tank (2) along the cleaning line (L8). The cleaning unit (100) can supply cleaning medium to the upper portion of the fuel tank (2).

[0489] The cleaning line (L8) may be connected to a bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Accordingly, the cleaning unit (100) may supply a cleaning medium to the fuel tank (2) along the bunkering line (L4) that transfers liquid fuel from the outside to the fuel tank (2). Specifically, the bunkering line (L4) may be connected to the upper portion of the fuel tank (2). Here, the cleaning line (L8) may mean the same line as the bunkering line (L4).

[0490] The cleaning unit (100) can supply a cleaning medium to the fuel tank (2) along a first fuel bunkering line (L4a) that transfers first fuel from the outside to the fuel tank (2). In addition, the cleaning unit (100) can supply a cleaning medium to the fuel tank (2) along a fuel supply line (L1) that transfers liquid fuel from the fuel tank (2) to a demander (14), but the present invention is not limited thereto.

[0491] The first fuel may be discharged to the outside through the first fuel transfer pump (LP) together with the cleaning medium, and the second fuel may be discharged to the outside through the second fuel transfer pump (DP) together with the cleaning medium. The first fuel transfer pump (LP) may be provided inside the fuel tank (2). The second fuel transfer pump (DP) may be provided in the engine room (13).

[0492] The first fuel can be discharged upward from the fuel tank (2) through the first fuel transfer pump (LP) together with the cleaning medium.

[0493] The second fuel is discharged from the bottom of the fuel tank (2) together with the cleaning medium and can be discharged to the outside through the second fuel transfer pump (DP).

[0494] The first fuel may be discharged to the outside along the first fuel manifold (not shown) through the first fuel transfer pump (LP) together with the cleaning medium, and the second fuel may be discharged to the outside along the second fuel manifold (not shown) through the second fuel transfer pump (DP) together with the cleaning medium.

[0495] The above first fuel manifold (not shown) may be a gaseous manifold.

[0496] The above second fuel manifold (not shown) can be provided on the upper side of the engine room (13).

[0497] The second fuel manifold (not shown) may be provided on one side of the engine casing (16) positioned above the engine room (13). In addition, the second fuel manifold (not shown) may be provided on one side of the cabin (15), but the present invention is not limited thereto.

[0498] The above cleaning unit (100) may further include an injection unit (110) that injects at least a portion of the cleaning medium into the fuel tank (2).

[0499] The above cleaning unit (100) further includes an eductor (120) that sucks in liquid fuel from the fuel tank (2), and the cleaning medium remaining after being sprayed from the spray unit (110) can be transferred to the eductor (120).

[0500] The above eductor (120) can discharge liquid fuel remaining at the bottom of the fuel tank (2) together with the cleaning medium to the outside using the pressure of the cleaning medium as a driving force.

[0501] The above cleaning unit (100) further includes a stripping pump (130) provided inside the fuel tank (2), and the stripping pump (130) can discharge liquid fuel remaining at the bottom of the fuel tank (2) to the outside together with a cleaning medium.

[0502] The liquid fuel processing system according to the 17th embodiment of the present invention can be installed in a container ship, but the present invention is not limited thereto.

[0503]

[0504] In this way, the fuel supply tank (22) according to one embodiment of the present invention can collect fuel leaked from the return section (22b). In addition, the return section (22b) can collect bilge water. A drain tank separately provided on the vessel can be omitted.

[0505] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention includes a purging tank (4) that collects liquid fuel returned from a demand source (14) or a fuel supply unit (3), and the liquid fuel can be supplied from a fuel storage tank (21) to the demand source (14) via the fuel supply unit (3). At this time, the fuel supply tank (22) can be omitted. The liquid fuel collected in the purging tank (4) can be transferred to the fuel storage tank (21) by gravity.

[0506] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention may include a valve room (8) that accommodates a first transfer valve (V1). The valve room (8) may be provided in a form that completely seals the interior and exterior, and in this case, the pressure of the fuel tank (2) may be maintained above a preset pressure. In addition, the valve room (8) may be provided in a form that partially seals the interior and exterior, and in this case, the liquid fuel may be collected and processed.

[0507] In addition, a liquid fuel processing system (10) according to one embodiment of the present invention includes a pump casing (PC) provided below a fuel tank (2) and accommodating a transfer pump (P), and a fuel supply line (L1) connected to the transfer pump (P) can pass through the inside of the fuel tank (2).

[0508] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention may include a second transfer valve (V2) disposed inside the fuel tank (2). The second transfer valve (V2) may block the flow of liquid fuel when the liquid fuel leaks downstream of the fuel tank (2).

[0509] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention includes a leak treatment unit (70), and the leak treatment unit (70) includes a drain sensor (72) provided in a leak treatment line (L7), and the drain sensor (72) can detect leakage of liquid fuel during bunkering. However, when foreign substances such as water are supplied to the leak treatment unit (70), the drain valve (73) provided in the leak treatment line (L7) can block the flow of liquid fuel to the drain sensor (72). Therefore, it is possible to accurately determine whether there is a leakage due to foreign substances, etc.

[0510] In addition, a liquid fuel processing system (10) according to one embodiment of the present invention includes a fuel tank (2) that stores one of a first fuel and a second fuel having different boiling points, and the fuel tank (2) is separated into a first storage section (2a) and a second storage section (2b), so that when the first fuel is stored in the fuel tank (2), the second storage section (2b) can be maintained as an empty space.

[0511] In addition, a liquid fuel processing system (10) according to one embodiment of the present invention is provided inside a fuel tank (2) and includes a heating unit (2g) for heating a second fuel, and the heating unit (2g) can be used to heat the first fuel stored in the first storage unit (2a).

[0512] In addition, a liquid fuel processing system (10) according to one embodiment of the present invention includes a heating unit (2g) provided inside a fuel tank (2) and a temperature control unit (TC) that controls the temperature of the liquid fuel in response to the temperature required by the demander, and the operating load of the heating unit (2g) and the temperature control unit (TC) can be controlled according to the internal pressure or temperature of the fuel tank (2).

[0513] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention may include a fuel tank (2) arranged in a first region (1161a) of a hold (116), outer tanks (VT) arranged on the left and right sides of the hull in a second region (1161b), and a loading section (LD) arranged between the outer tanks (VT) and on which containers are loaded. Accordingly, a fuel tank provided separately from the fuel tank (2) or an outer tank (VT) provided in the gap (G) may be omitted. In addition, containers may be additionally loaded compared to a ship (1) in which the fuel tank (2) extends to the second region (1161b).

[0514] In addition, the liquid fuel processing system (10) according to one embodiment of the present invention may include a cleaning unit (100) that supplies a cleaning medium to a fuel tank (2) and a collection tank (ST) that collects a mixture of liquid fuel and cleaning medium generated in the cleaning unit (100). When the first fuel is discharged from the fuel tank (2), the first fuel may be diluted in the collection tank (ST) and discharged to the outside or treated in the hull (11), and when the second fuel is discharged from the fuel tank (2), the second fuel may be separated from the cleaning medium in the collection tank (ST) and discharged to the outside or treated in the hull (11).

[0515] The cleaning unit (100) can transfer the cleaning medium to the fuel tank (2) through the cleaning line (L8), and at this time, the cleaning line (L8) can be a fuel supply line (L1) or a bunkering line (L4). In addition, the mixture of the cleaning medium and the liquid fuel discharged from the fuel tank (2) can be discharged to the outside by a transfer pump, and at this time, the mixture of the cleaning medium and the liquid fuel can be discharged to the outside along at least a part of the fuel supply line (L1) or at least a part of the bunkering line (L4).

[0516] The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and a known technology as another embodiment.

[0517] While the present invention has been described above with reference to embodiments thereof, these are merely examples and are not intended to limit the present invention. Those skilled in the art will appreciate that various combinations, modifications, and applications not illustrated in the embodiments are possible without departing from the essential technical content of the embodiments. Therefore, technical contents related to modifications and applications readily derivable from the embodiments of the present invention should be construed as being encompassed by the present invention.

Claims

1. A number of holds provided along the length of the hull; A partition wall dividing the internal space of at least one of the above holds into a plurality of separate spaces along the left and right directions; and The above separation space is divided into a plurality of fuel spaces and includes a separation unit having an openable structure. The above separation part, When the first fuel among the first and second fuels having different boiling points is stored in the above separation space, it is opened. A liquid fuel handling system that is sealed when secondary fuel is stored in the above separation space.

2. In paragraph 1, The above separation part, When the first fuel with a relatively low boiling point is stored in the above separation space, it is opened. A liquid fuel processing system in which, when a second fuel having a relatively high boiling point is stored in the above separation space, the space is sealed so that the volume of the fuel space in which the second fuel is stored becomes less than a preset value.

3. In paragraph 2, When a second fuel with a relatively high boiling point is stored in the above separation space, A liquid fuel handling system in which the fuel space where the secondary fuel is stored is maintained as at least a portion of empty space.

4. In paragraph 1, A hold wall dividing the internal space of the above hold in the forward and backward directions; and A liquid fuel processing system including an outer tank arranged on the left and right sides of an area provided at the rear of the internal space of the above hold.

5. In paragraph 4, A liquid fuel handling system further comprising a loading section provided between a pair of outer tanks and in which containers are loaded.

6. In paragraph 1, A liquid fuel processing system further comprising a connecting portion that opens at least a portion of the separating portion to connect the fuel spaces to each other.

7. Fuel supply unit that supplies liquid fuel from the fuel tank to the demand source; A first transfer valve arranged outside the fuel tank and controlling the supply of liquid fuel; and A liquid fuel processing system including a valve room that accommodates the first transfer valve and forms an isolated space.

8. In paragraph 7, The above valve room, It is designed to be completely sealed inside and out. A liquid fuel processing system that maintains the pressure of the fuel tank above a preset pressure.

9. In paragraph 7, A liquid fuel processing system further comprising a ventilation unit installed to ventilate the interior of the valve room.

10. In paragraph 7, The above valve room, It is designed in a form that partially seals the inside and outside, A liquid fuel treatment system further comprising a leak treatment line for collecting fuel leaked from the valve room.

11. A fuel tank storing one of the liquid fuels, the first fuel and the second fuel having different boiling points; A cleaning unit that supplies a cleaning medium to the fuel tank; and A collection tank for collecting wastewater generated from the hull; The above collection tank, A liquid fuel processing system for storing liquid fuel discharged from the fuel tank together with a cleaning medium.

12. In paragraph 11, The above cleaning unit, A liquid fuel treatment system that supplies a cleaning medium to the fuel tank before replacing the first fuel or the second fuel of the fuel tank with a liquid fuel having a different boiling point or before injecting the liquid fuel into the fuel tank.

13. In paragraph 11, A liquid fuel processing system further comprising a control unit for discharging liquid fuel to the outside together with a cleaning medium when the concentration of the liquid fuel in the above collection tank is below a preset value.

14. In paragraph 11, The above cleaning unit, A liquid fuel propulsion system that supplies cleaning medium to the fuel tank using a feed pump provided at the rear of the hull.

15. In paragraph 11, The above collection tank, A first collection tank for collecting liquid fuel discharged from the fuel tank together with a cleaning medium; and A liquid fuel processing system comprising a second collection tank, which is separated from the first collection tank by a bulkhead and collects a cleaning medium separated from the liquid fuel by a density difference.

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