A ship

Abstract

The present invention provides a ship comprising a main engine that provides propulsion power for a ship using different fuels, and first and second power generation engines having different power generation capacities for producing power required within the ship, wherein the ship comprises: a first exhaust gas treatment unit for treating exhaust gas discharged from the main engine or the first power generation engine; a first economizer for producing steam using the exhaust gas of the first power generation engine; a second economizer for producing steam using the exhaust gas of the main engine or the second power generation engine; and a control unit for selectively operating the first economizer or the second economizer according to an operating mode among a gas mode using liquefied gas fuel of the main engine or an oil mode using oil fuel.

Description

Technology Field

[0001] The present invention relates to a ship, and more specifically, to a ship in which an economizer and an exhaust gas treatment unit can be used in common when the main engine and the power generation engine provided within the ship are driven. Background Technology

[0002] Generally, ships are equipped with engines such as a main engine to rotate propulsion devices like propellers and a generator engine to provide the power required on board.

[0003] When operating a ship, approximately 25% of the fuel required to run the engine is released into the atmosphere in the form of exhaust gas. To recover this wasted energy, ships are recently being equipped with waste heat recovery systems such as Exhaust Gas Economizers (EGE).

[0004] Here, the economizer can produce steam by heating water using exhaust gas emitted from the engine as a heat source, and the produced steam can be used in various applications within the ship.

[0005] Meanwhile, as the efficiency of the main engines, which are the primary propulsion systems, gradually improves in recently constructed ships, the temperature of the exhaust gas is decreasing and the volume of exhaust gas is decreasing.

[0006] Consequently, as the amount of steam generated by economizers utilizing the main engine's exhaust gas falls short of the steam required during operation, there is a growing trend among shipowners to request additional economizers utilizing the exhaust gas from generator engines for onboard electricity generation.

[0007] The ship is equipped with multiple generator engines; during normal operation, one generator engine is operated, and when a large amount of power is required, two generator engines are operated. In addition, a total of two generator engines are operated by providing an extra generator engine in case one fails.

[0008] At this time, an economizer may be installed on each of the main engine and the two generator engines.

[0009] That is, during normal operation of the ship, steam can be generated by operating an economizer connected to the main engine and an economizer connected to one generator engine, and an economizer is also installed in the additional generator engine to prepare for the failure of the generator engine.

[0010] However, vessels with this type of installation face problems such as increased costs due to the installation of unnecessary economizers and reduced efficiency in space utilization within the ship. Prior art literature

[0011] Published Patent No. 2014-0056531 (Publication Date: May 12, 2014) "Boiler System for Ships" The problem to be solved

[0012] The present invention aims to provide a vessel that can maximize the efficiency of the economizer, increase the efficiency of space utilization within the vessel, and reduce costs by configuring the vessel, specifically, so that the economizer and the exhaust gas treatment unit can be used in common when the main engine and the power generation engine equipped within the vessel are operated.

[0013] The technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0014] To solve the problem described above, the present invention provides a ship comprising a main engine that provides propulsion power for a ship using different fuels, and first and second power generation engines having different power generation capacities for producing power required within the ship, wherein the ship comprises: a first exhaust gas treatment unit for treating exhaust gas emitted from the main engine or the first power generation engine; a first economizer for producing steam using the exhaust gas of the first power generation engine; a second economizer for producing steam using the exhaust gas of the main engine or the second power generation engine; and a control unit for selectively operating the first economizer or the second economizer according to an operating mode among a gas mode using liquefied gas fuel of the main engine or an oil mode using oil fuel.

[0015] Additionally, the control unit provides a vessel in which, when the main engine is operated in a gas mode using liquefied gas fuel, the exhaust gas of the main engine is introduced into a second economizer, and the exhaust gas of the first power generation engine is introduced into the first economizer through a first exhaust gas treatment unit.

[0016] Additionally, the vessel further includes a second exhaust gas treatment unit for treating exhaust gas emitted from a second power generation engine, and the control unit, when the main engine is operated in an oil mode using oil fuel, introduces the exhaust gas of the main engine into a first exhaust gas treatment unit and introduces the exhaust gas of the second power generation engine into a second economizer via the second exhaust gas treatment unit.

[0017] Additionally, the first economizer is set based on the capacity of the first power generation engine, the first exhaust gas treatment unit is set based on the capacity of the main engine, and the second economizer is set based on the capacity of the second power generation engine, thereby providing a vessel.

[0018] Additionally, the present invention provides a vessel comprising: a first flow line connecting a main engine and a first exhaust gas treatment unit and selectively opening and closing; a second flow line connecting a main engine and a second economizer and selectively opening and closing; a first exhaust line connected to a first power generation engine and passing through a first exhaust gas treatment unit; a second exhaust line connected to a first exhaust gas treatment unit and passing through a first economizer; and a third exhaust line connected to a second power generation engine and passing through a second exhaust gas treatment unit and a second economizer. Effects of the invention

[0019] A vessel according to an embodiment of the present invention is configured so that an economizer and an exhaust gas treatment unit can be used in common when the main engine and the power generation engine provided in the vessel are operated, thereby maximizing the efficiency of the economizer and the exhaust gas treatment unit and reducing the installation of unnecessary economizers and exhaust gas treatment units that were previously installed according to the number of engines, thereby increasing the efficiency of space utilization within the vessel and reducing costs.

[0020] In addition, depending on whether the main engine is operated in a gas mode using liquefied gas fuel or in an oil mode using oil fuel, a pair of economizers can be selectively operated for the exhaust gases emitted from a pair of power generation engines of different capacities to produce sufficient steam required within the ship, thereby enabling the ship to be operated economically.

[0021] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below. Brief explanation of the drawing

[0022] FIG. 1 conceptually illustrates the configuration of a ship according to one embodiment of the present invention. FIGS. 2 to 4 illustrate the operating state of a main engine and a power generation engine inside a ship according to an embodiment of the present invention. Specific details for implementing the invention

[0023] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0024] The detailed description disclosed below, together with the attached drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiment in which the present invention can be practiced.

[0025] In order to clearly explain the invention in the drawings, parts unrelated to the explanation may be omitted, and the same reference numerals may be used for identical or similar components throughout the specification.

[0026] In embodiments of the present invention, expressions such as “or”, “at least one”, etc. may represent one of the words listed together or a combination of two or more.

[0027] FIG. 1 conceptually illustrates the configuration of a vessel (100) according to one embodiment of the present invention.

[0028] The vessel (100) according to the present embodiment is equipped with a main engine (110) that provides propulsion power for the vessel (100) using different fuels in the present embodiment, and a pair of power generation engines (120, 130) with different capacities that produce power required within the vessel (100). When the main engine (110) and the power generation engines (120, 130) are driven, the economizer (150, 170) and the exhaust gas treatment unit (140, 160) provided within the vessel (100) are configured to be used in common, thereby maximizing the efficiency of the use of the economizer (150, 170) and the exhaust gas treatment unit (140, 160).

[0029] In addition, the installation of unnecessary economizers and exhaust gas treatment units, which were previously installed according to the number of engines, can be reduced, thereby increasing the efficiency of space utilization within the ship (100) and reducing costs.

[0030] Referring to FIG. 1, a ship (100) according to one embodiment of the present invention may include a main engine (110), a first power generation engine (120), a second power generation engine (130), a first exhaust gas treatment unit (140), a first economizer (150), a second exhaust gas treatment unit (160), a second economizer (170), and a control unit (not shown).

[0031] The main engine (110) is a mechanism that provides propulsion for the ship (100) and can provide power to rotate a propeller installed at the rear of the hull.

[0032] In addition, the main engine (110) of the present embodiment may be configured to use different types of fuel, and as an example, may use liquefied gas fuels such as liquefied natural gas (LNG), liquefied petroleum gas (LPG) and liquefied ethane gas, and oil fuels such as diesel and heavy oil (e.g., Bunker C oil).

[0033] This main engine (110) can operate in gas mode when using liquefied gas fuel and in oil mode when using oil fuel.

[0034] For example, generally when operating a ship (100), the main engine (110) may operate in a gas mode using liquefied natural gas (LNG) as fuel, and may be switched to an oil mode when the load of the main engine (110) is below an appropriate load, when there is insufficient boil-off gas (BOG) of the liquefied natural gas (LNG) used as fuel, or when a problem occurs in the operation of the gas mode.

[0035] At this time, the exhaust gas emitted from the main engine (110) during operation in gas mode satisfies the International Maritime Organization (IMO) hazardous gas emission regulations, so it can be discharged to the outside without a separate treatment process, whereas the exhaust gas emitted from the main engine (110) during operation in oil mode can be discharged to the outside after being purified through the exhaust gas treatment unit (140).

[0036] The first power generation engine (120) and the second power generation engine (130) can produce the power required in the ship (100) using oil fuel.

[0037] At this time, the first power generation engine (120) and the second power generation engine (130) may be configured to have different power generation capacities, and in this embodiment, the second power generation engine (130) may be configured to have a larger power generation capacity than the first power generation engine (120).

[0038] The first power generation engine (120) and the second power generation engine (130) can be selectively used depending on the operating mode of the main engine (110), namely, gas mode or oil mode.

[0039] The first exhaust gas treatment unit (140) is set based on the capacity of the main engine (110) and can treat and discharge exhaust gas emitted from the main engine (110) or the first power generation engine (120).

[0040] Specifically, a first exhaust line (181) for discharging exhaust gas to the outside is connected to the first power generation engine (120), and a first exhaust gas treatment unit (140) may be provided on the first exhaust line (181).

[0041] Additionally, a first flow line (111) may be connected between the main engine (110) and the first exhaust gas treatment unit (140) to selectively introduce exhaust gas discharged from the main engine (110) into the first exhaust gas treatment unit (140).

[0042] At this time, a first valve (V1, see FIG. 2 and FIG. 3) that opens and closes the first flow line (111) according to the control of a control unit (not shown) described later may be provided on the first flow line (111).

[0043] For example, when the main engine (110) is operating in oil mode, exhaust gas discharged from the main engine (110) can be introduced into the first exhaust gas treatment unit (140) through the first flow line (111).

[0044] The first economizer (150) is connected to the first exhaust gas treatment unit (140) and can produce steam using high-temperature exhaust gas discharged from the first power generation engine (120) through the first exhaust gas treatment unit (140), and the produced steam can be used at a steam utilization site within the ship.

[0045] At this time, the capacity of the first economizer (150) is set based on the capacity of the first power generation engine (120), and in this embodiment, as the capacity of the first power generation engine (120) is configured to be less than the capacity of the second power generation engine (130), the first economizer (150) can also be formed with a low capacity.

[0046] Here, a second exhaust line (182) is connected to the first exhaust gas treatment unit (140), and a first economizer (150) may be provided on the second exhaust line (182).

[0047] Accordingly, the exhaust gas emitted from the first power generation engine (120) is processed by passing through the first exhaust gas treatment unit (140) along the first exhaust line (181), and the processed exhaust gas can be discharged to the outside after passing through the first economizer (150) along the second exhaust line (182).

[0048] The second exhaust gas treatment unit (160) can treat and discharge exhaust gas emitted from the second power generation engine (130).

[0049] Specifically, a third exhaust line (183) for discharging exhaust gas to the outside is connected to the second power generation engine (130), and a second exhaust gas treatment unit (160) and a second economizer (170) may be provided on the third exhaust line (183).

[0050] The second economizer (170) is set based on the capacity of the second power generation engine (130), and can produce steam using high-temperature exhaust gas discharged from the second power generation engine (130) through the second exhaust gas treatment unit (160) or high-temperature exhaust gas discharged from the main engine (110), and the produced steam can be used at a steam utilization site within the ship.

[0051] At this time, a second flow line (112) can be connected between the main engine (110) and the second economizer (170) to selectively introduce exhaust gas discharged from the main engine (110) into the second economizer (170).

[0052] Additionally, a second valve (V2, see FIG. 2 and FIG. 3) that opens and closes the second flow line (112) according to the control of a control unit (not shown) described later may be provided on the second flow line (112).

[0053] For example, when the main engine (110) is operating in gas mode, exhaust gas discharged from the main engine (110) can be introduced into the second economizer (170) through the second flow line (112).

[0054] The second economizer (170) is configured to produce steam using exhaust gas emitted from the main engine (110) or the second power generation engine (130). In this embodiment, since the power generation capacity of the second power generation engine (130) is greater than the power generation capacity of the first power generation engine (120), the second economizer (170) can be configured to have a larger processing capacity than the first economizer (150).

[0055] A control unit (not shown) can selectively operate a low-capacity first power generation engine (120) and a high-capacity second power generation engine (130) according to the operating mode of the main engine (110), namely, gas mode or oil mode, and can also control the operation of the first and second valves (V1, V2, see FIG. 2 and FIG. 3) to selectively open and close the first and second flow lines (111, 112) connected to the main engine (110).

[0056] Additionally, the control unit (not shown) can selectively operate the first exhaust gas treatment unit (140), the second exhaust gas treatment unit (160), the first economizer (150), and the second economizer (170) depending on the gas mode or oil mode of the main engine (110).

[0057] FIGS. 2 to 4 illustrate the operating state of the main engine (110) and the power generation engine (120, 130) inside a ship (100) according to one embodiment of the present invention.

[0058] Referring to FIG. 2, the vessel (100) according to the present embodiment can operate the vessel (100) in a gas mode by using liquefied gas fuel to drive the main engine (110) during normal vessel (100) operation.

[0059] When operating the main engine (110) in gas mode, the first power generation engine (120), which has a lower capacity than the second power generation engine (130), can be driven, and the first and second economizers (150, 170) can be operated simultaneously to produce steam.

[0060] Specifically, when the main engine (110) is operated in gas mode, the second valve (V2) on the second flow line (112) is opened according to the control of the control unit (not shown), so that exhaust gas discharged from the main engine (110) can flow into the second economizer (170) through the second flow line (112).

[0061] In addition, the second economizer (170) can generate steam using the waste heat of the incoming exhaust gas, and the exhaust gas that has passed through the second economizer (170) can be discharged to the outside through the third exhaust line (183).

[0062] At this time, when operating in gas mode, the exhaust gas emitted from the main engine (110) satisfies the International Maritime Organization (IMO) hazardous gas emission regulations and can be discharged to the outside without a separate treatment process.

[0063] In addition, a first power generation engine (120) of low capacity for producing power can be driven.

[0064] When operating in gas mode, the steam generation efficiency using exhaust gas is lower than when operating in oil mode because the main engine (110) uses liquefied gas fuel. To address this, the first economizer (150) connected to the first power generation engine (120) can be operated.

[0065] Exhaust gas discharged by the operation of the first power generation engine (120) can be introduced into the first exhaust gas treatment unit (140) through the first exhaust line (181), and exhaust gas purified through the first exhaust gas treatment unit (140) can be introduced into the first economizer (150) through the second exhaust line (182).

[0066] In addition, the first economizer (150) can generate steam using the waste heat of the incoming exhaust gas, and the exhaust gas that has passed through the first economizer (150) can be discharged to the outside through the second exhaust line (182).

[0067] Accordingly, when operating in gas mode, exhaust gas discharged from the main engine (110) is introduced into the second economizer (170), and exhaust gas discharged from the first power generation engine (120) is introduced into the first economizer (150), and by operating the first and second economizers (150, 170) simultaneously, a sufficient amount of steam can be generated and supplied to the steam utilization site within the ship (100).

[0068] Meanwhile, the vessel (100) according to the present embodiment may be switched to an oil mode when the load of the main engine (110) is below an appropriate load while operating in a gas mode, when the boil-off gas (BOG) of the liquefied natural gas (LNG) used as fuel is insufficient, or when there is a problem with the operation of the gas mode.

[0069] Referring to FIG. 3, when the main engine (110) is operated in oil mode, a second power generation engine (130) with a higher capacity than the first power generation engine (120) can be driven, and a second economizer (170) can be operated to produce power.

[0070] Specifically, when the main engine (110) is switched to oil mode, the first valve (V1) on the first flow line (111) is opened and the second valve (V2) on the second flow line (112) is closed according to the control of the control unit (not shown), so that exhaust gas discharged from the main engine (110) can flow into the first exhaust gas treatment unit (140) through the first flow line (111), and the exhaust gas purified through the first exhaust gas treatment unit (140) can be discharged to the outside through the first exhaust line (181).

[0071] In addition, a second power generation engine (130) with a high capacity for generating power can be driven.

[0072] At this time, exhaust gas discharged according to the operation of the second power generation engine (130) can be introduced into the second exhaust gas treatment unit (160) through the third exhaust line (183), and exhaust gas purified through the second exhaust gas treatment unit (160) can be introduced into the second economizer (170) through the third exhaust line (183).

[0073] In addition, the second economizer (170) can generate steam using the waste heat of the exhaust gas, and the exhaust gas that has passed through the second economizer (170) can be discharged to the outside through the third exhaust line (183).

[0074] Accordingly, when operating in oil mode, exhaust gas discharged from the main engine (110) is introduced into the first exhaust gas treatment unit (140) and discharged to the outside, and exhaust gas discharged from the high-capacity second power generation engine (130) is introduced into the second economizer (170) to generate a sufficient amount of steam, thereby supplying steam required for steam utilization within the ship (100).

[0075] Meanwhile, referring to FIG. 4, when the ship (100) is docked at a port or stops operation and loads or unloads cargo, the main engine (110) is not operated. In this case, at least one of the first power generation engine (120) and the second power generation engine (130) is driven to operate the first economizer (150) or the second economizer (170), thereby producing the necessary steam inside the ship (100).

[0076] As described above, the vessel (100) according to the embodiment of the present invention is configured so that the economizer (150, 170) and the exhaust gas treatment unit (140, 160) can be used in common when the main engine (110) and the power generation engine (120, 130) provided in the vessel (100) are operated, thereby maximizing the efficiency of the economizer (150, 170) and the exhaust gas treatment unit (140, 160), and reducing the installation of unnecessary economizers and exhaust gas treatment units that were previously installed according to the number of engines, thereby increasing the space utilization efficiency and reducing costs within the vessel (100).

[0077] In addition, depending on whether the main engine (110) is operated in a gas mode using liquefied gas fuel or in an oil mode using oil fuel, a pair of power generation engines (120, 130) and a pair of economizers (150, 170) of different capacities are selectively operated to produce sufficient power required within the vessel (100), thereby allowing the vessel (100) to be operated economically.

[0078] The embodiments of the invention disclosed in this specification and drawings are provided merely as specific examples to facilitate the explanation of the technical content of the invention and to aid in understanding the invention, and are not intended to limit the scope of the invention.

[0079] Accordingly, the scope of the present invention should be interpreted as including all modifications or variations derived based on the technical concept of the present invention, in addition to the embodiments disclosed herein. Explanation of the symbols

[0080] 100 : Ship 110 : Main engine 120: 1st power generation engine 130: 2nd power generation engine 140: 1st Exhaust Gas Treatment Unit 150: 1st Economizer 160: 2nd Exhaust Gas Treatment Unit 170: 2nd Economizer

Claims

Claim 1 A ship comprising a main engine that provides propulsion power for the ship using different fuels, and first and second power generation engines having different power generation capacities for producing power required within the ship, wherein the ship comprises: a first exhaust gas treatment unit for treating exhaust gas discharged from the main engine or the first power generation engine; a second exhaust gas treatment unit for treating exhaust gas discharged from the second power generation engine; a first economizer for producing steam using the exhaust gas of the first power generation engine; and a second economizer for producing steam using the exhaust gas of the main engine or the second power generation engine. A vessel comprising a control unit that selectively operates the first economizer or the second economizer according to the operating mode of the main engine, which is a gas mode using liquefied gas fuel or an oil mode using oil fuel, wherein the second power generation engine has a larger power generation capacity than the first power generation engine, and the control unit, when the main engine is operated in a gas mode using liquefied gas fuel, introduces the exhaust gas of the main engine into the second economizer and introduces the exhaust gas of the first power generation engine into the first economizer via the first exhaust gas treatment unit, and when the main engine is operated in an oil mode using oil fuel, introduces the exhaust gas of the main engine into the first exhaust gas treatment unit and introduces the exhaust gas of the second power generation engine into the second economizer via the second exhaust gas treatment unit. Claim 2 delete Claim 3 delete Claim 4 A vessel according to claim 1, wherein the first economizer is set based on the capacity of the first power generation engine, the first exhaust gas treatment unit is set based on the capacity of the main engine, and the second economizer is set based on the capacity of the second power generation engine. Claim 5 A vessel comprising: a first flow line connecting the main engine and the first exhaust gas treatment unit and selectively opening and closing; a second flow line connecting the main engine and the second economizer and selectively opening and closing; a first exhaust line connected to the first power generation engine and passing through the first exhaust gas treatment unit; a second exhaust line connected to the first exhaust gas treatment unit and passing through the first economizer; and a third exhaust line connected to the second power generation engine and passing through the second exhaust gas treatment unit and the second economizer.

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