CN110770118A - Fuel supply system and method for ship - Google Patents
Fuel supply system and method for ship Download PDFInfo
- Publication number
- CN110770118A CN110770118A CN201780091988.9A CN201780091988A CN110770118A CN 110770118 A CN110770118 A CN 110770118A CN 201780091988 A CN201780091988 A CN 201780091988A CN 110770118 A CN110770118 A CN 110770118A
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- Prior art keywords
- fuel
- engine
- ship
- pump
- tank
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- 239000000446 fuel Substances 0.000 title claims abstract description 332
- 238000000034 method Methods 0.000 title claims abstract description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003345 natural gas Substances 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 20
- 239000003949 liquefied natural gas Substances 0.000 description 9
- 239000000295 fuel oil Substances 0.000 description 6
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A method for supplying fuel to a ship is disclosed. The fuel supply method of a ship relates to a fuel supply method of a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel, supplies compressed air to a pressurizing tank to store fuel in a pressurized state, supplies the fuel stored in the pressurizing tank with a circulation pump in a case where the engine is operated in a fuel mode, adjusts the fuel pressurized by the circulation pump to a temperature required by the engine through a temperature adjusting device, and supplies the fuel passing through the temperature adjusting device to the engine.
Description
Technical Field
The present invention relates to a fuel supply system and method for a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel.
Background
In recent years, the consumption of Liquefied Gas such as Liquefied Natural Gas (LNG) has been increasing rapidly worldwide. Compared to gas, liquefied gas that liquefies gas at low temperature has an advantage in that storage and transportation efficiency can be improved because its volume is very small. In addition, in the liquefaction process, liquefied gas including liquefied natural gas can remove or reduce air pollutants, and can also be regarded as an environmentally friendly fuel that discharges a small amount of air pollutants when burned.
Liquefied natural gas is a colorless transparent liquid that can be liquefied by cooling natural gas containing methane (methane) as a main component to about-162 ℃, and has a volume of about 1/600 compared with natural gas. Therefore, when natural gas is liquefied and transported, the natural gas can be transported very efficiently.
However, the liquefaction temperature of natural gas is an extremely low temperature of-162 ℃ at atmospheric pressure, and thus liquefied natural gas is sensitive to temperature variation and easily vaporized. Thus, although the storage tank storing the liquefied natural Gas is thermally insulated, since external heat is continuously transferred to the storage tank, Boil-Off Gas (BOG) is generated as the liquefied natural Gas is naturally vaporized continuously in the storage tank during the transportation of the liquefied natural Gas. This is also the case for other cryogenic liquefied gases such as ethane.
Boil-off gas is an important issue in terms of transport efficiency as a loss. Further, when the boil-off gas accumulates in the storage tank, the internal pressure of the tank may rise excessively, and there is a risk of damaging the tank. Therefore, various methods of treating the boil-off gas generated in the storage tank have been studied, and in recent years, for treating the boil-off gas, a method of liquefying the boil-off gas again and returning it to the storage tank, a method of using the boil-off gas as an energy source at the fuel consumption site such as an engine of a ship, or the like has been used.
In addition, among engines commonly used in ships, engines that may use natural gas as Fuel may include an ME-GI engine, a Dual Fuel (DF) engine, and the like.
The ME-GI engine is constituted by two strokes, and employs a Diesel Cycle (Diesel Cycle) in which high-pressure natural gas of about 300bar is directly injected into a combustion chamber near the top dead center of a piston.
The DF engine is constituted by four strokes, and employs an Otto Cycle (Otto Cycle) in which natural gas having a pressure of about 6.5bar, which is a relatively low pressure, is injected and a mixture gas, which is a fluid in which combustion air is mixed with the natural gas, is compressed as a piston rises.
Natural gas is less expensive than fuel oil and requires processing of boil-off gas generated in a storage tank storing liquefied natural gas, so the ME-GI engine and the DF engine can be operated to use natural gas preferentially as fuel and fuel oil in the case of shortage of natural gas.
When the engine is operated in such a manner that natural gas is preferentially used as fuel, although the amount of fuel used is very small or not used, conventionally, in order to immediately supply fuel in the case of a shortage of natural gas, it is necessary to operate the fuel supply pump all the time, and there is a problem in that a large energy loss is caused thereby.
Disclosure of Invention
Technical problem to be solved
The present invention is directed to provide a fuel supply system and method for a ship, which can immediately supply fuel to an engine when natural gas is insufficient, even if a fuel supply pump is not always operated but is operated only when necessary.
Means for solving the problems
According to an aspect of the present invention for achieving the above object, there is provided a fuel supply method of a ship, which relates to a fuel supply method of a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel, the method supplying compressed air to a pressurizing tank to store fuel in a pressurized state, in a case where the engine is operated in a fuel mode, supplying the fuel stored in the pressurizing tank with a circulation pump, adjusting the fuel pressurized by the circulation pump to a temperature required by the engine through a temperature adjusting device, and supplying the fuel passing through the temperature adjusting device to the engine.
In the case where the fuel stored in the pressurizing tank cannot satisfy the required amount of the engine, the fuel stored in the storage tank may be pressurized by the supply pump and supplied to the engine.
In the case where the amount of fuel inside the pressurizing tank is a first measured value or less, the fuel stored in the storage tank may be pressurized by the supply pump and supplied to the pressurizing tank.
The fuel used in the engine and remaining may be temporarily stored in a pipe and delivered to the circulation pump after the air is removed.
When the amount of fuel in the inside of the pipe is above the third measurement value, the fuel stored in the pipe may be delivered to the storage tank.
Fuel used in the engine and remaining can bypass the conduit and be delivered to the storage tank.
The fuel discharged from the pressurizing tank can be prevented from flowing backward in the direction of the feed pump.
According to another aspect of the present invention for achieving the above object, there is provided a fuel supply system of a ship, which relates to a fuel supply system of a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel, the system including a storage tank that stores fuel supplied to the engine, a supply pump that pressurizes fuel discharged from the storage tank, a pressurizing tank that is provided at a rear end of the supply pump and that receives compressed air and stores fuel in a pressurized state, a pressurizing tank that is provided at a rear end of the pressurizing tank and that pressurizes the fuel, a circulating pump that is provided at a rear end of the pressurizing tank and that pressurizes the fuel, and a temperature adjusting device that is provided at a rear end of the circulating pump and that adjusts the fuel pressurized by the circulating pump to a temperature required by the engine, wherein, when the engine is operated in a fuel mode, the fuel stored in the pressurizing tank is preferentially supplied to the engine.
The fuel supply system of the ship may further include a return line that branches from a line between the supply pump and the pressurizing tank and merges to a line between the supply pump and the storage tank, and through which fuel that is not used in the engine among fuel pressurized by the supply pump may be circulated.
The return line may comprise a heat dissipation duct.
The circulation pump may compress the fuel discharged from the pressurizing tank, or a fluid in which the fuel discharged from the pressurizing tank and the fuel pressurized by the feed pump are combined.
The fuel supply system of the ship may further include a water level detector that is provided at an inside of the pressurizing tank and that measures an amount of fuel stored in the pressurizing tank, and the water level detector may transmit a signal to the supply pump to operate the supply pump in a case where the measured amount of fuel is a first measurement value or less, and may transmit a signal to the supply pump to stop the operation of the supply pump in a case where the measured amount of fuel is a second measurement value or more, and the supply pump may pressurize the fuel discharged from the storage tank to supply it to the pressurizing tank in a case where the measured amount of fuel is the first measurement value or less.
The fuel supply system of the ship may further include a pipe temporarily storing fuel used in the engine and remaining, and an air removing device removing air contained in the fuel temporarily stored in the pipe, and the fuel from which the air is removed by the air removing device may be delivered to the circulation pump.
The fuel supply system of the ship may further include a first valve that is opened to deliver the fuel stored in the pipe to the storage tank when the amount of the fuel inside the pipe is a third measured value.
The fuel supply system of the ship may further include a bypass line that branches from between the pipe and the engine and merges between the pipe and the storage tank, and fuel may be supplied to the storage tank by bypassing the pipe through the bypass line.
The fuel supply system of the ship may further include a flow meter that is provided at the supply pump and at a rear end of the pressurizing tank and measures a flow rate of the fuel supplied to the engine.
The fuel supply system of the ship may further include a filtering device provided at a front end of the engine and filtering foreign substances mixed in the fuel delivered to the engine.
The fuel supply system of the ship may include a fifth valve that is provided between the supply pump and the pressurizing tank and prevents the fuel discharged from the pressurizing tank from flowing backward to the supply pump.
According to still another aspect of the present invention for achieving the above object, there is provided a fuel supply method of a ship, which preferentially supplies fuel stored in a pressurized state in a pressurized tank to an engine in a case where the engine is driven in a fuel mode, and pressurizes fuel stored in a storage tank by a supply pump to supply it to the engine in a case where the fuel stored in the pressurized state is insufficient.
Effects of the invention
According to the present invention, since the fuel tank for storing the fuel pressurized by the compressed air is provided, the fuel stored in the fuel tank is preferentially used when the engine is driven in the fuel mode, and thus the energy used for driving the supply pump can be reduced.
Further, according to the present invention, even in the case where it is necessary to drive the supply pump, it is only necessary to drive the supply pump during the period in which the engine consumes the fuel stored in the pressurizing tank, and therefore it is possible to secure the time required to drive the supply pump.
Drawings
Fig. 1 is a schematic view of a fuel supply system of a ship according to a first preferred embodiment of the present invention.
Fig. 2 is a schematic view of a fuel supply system of a ship according to a preferred second embodiment of the present invention.
Detailed Description
Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Further, the following embodiments may be modified into various other ways, and the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a schematic view of a fuel supply system of a ship according to a first preferred embodiment of the present invention.
Referring to fig. 1, the fuel supply system of a ship of the present embodiment includes a storage tank (300), a supply pump (400), a pressurizing tank (500), a return line (L1), a circulation pump (700), and a temperature adjusting device (800).
The storage tank (300) of the present embodiment stores fuel, and the fuel stored in the storage tank (300) is supplied to the engine (100). A portion of the fuel used and remaining in the engine (100) may be delivered to the storage tank (300), and a third valve (30) that regulates the flow and opening and closing of the fuel may be provided on a line that delivers the fuel used and remaining in the engine (100) to the storage tank (300).
The engine (100) that supplies fuel in the fuel supply system for a ship according to the present embodiment is an engine that can use both gas and fuel as fuel, and may be an ME-GI engine. The engine (100) of the present embodiment can be operated in a gas mode using natural gas as a main fuel or in a fuel mode using fuel oil as a fuel.
The supply pump (400) of the present embodiment pressurizes the fuel discharged from the storage tank (300). The supply pump (400) of the present embodiment may be provided in parallel in plurality, and may be replaced with another pump when one or more pumps fail.
The pressurizing tank (500) of the present embodiment is provided at the rear end of the feed pump (400), and receives compressed air from the outside and stores fuel in a pressurized state. A second valve (20) for adjusting the flow rate and opening/closing of the compressed air may be provided on a line for supplying the compressed air to the pressurizing tank (500).
The fuel supply system of a ship of the present embodiment may further include a fifth valve (50), and the fifth valve (50) is disposed between the pressurizing tank (500) and the supply pump (400), and prevents the fuel discharged from the pressurizing tank (500) from flowing backward to the supply pump (400).
Since the fuel supply system of the ship of the present embodiment includes the pressurizing tank (500), the fuel stored in the pressurizing tank (500) can be preferentially supplied to the engine (100) when the engine (100) is operated in the fuel mode.
Generally, natural gas is used as a fuel for the engine (100) first, and fuel oil is used as a fuel for the engine (100) only at the moment when natural gas is insufficient, so the amount of fuel oil used is very small. Therefore, even with the pressurizing tank (500) of the present embodiment, it is possible to supply fuel to the engine (100) sufficiently stably, and to operate the supply pump (400) when the fuel stored in the pressurizing tank (500) is insufficient.
According to the fuel supply system for a ship of the present embodiment, the supply pump (400) is operated only in a special situation where the fuel stored in the pressurizing tank (500) is insufficient, and therefore the energy consumed when the supply pump (400) is operated can be reduced.
Further, according to the fuel supply system for a ship of the present embodiment, the supply pump (400) may be operated only during the period when the engine (100) consumes the fuel stored in the pressurizing tank (500), and therefore, the time consumed when the supply pump (400) is operated can be ensured.
Furthermore, since the amount of fuel used in the engine (100) is small and the loss of fuel is small, a sufficient pressure for circulating the fuel can be obtained by the circulation pump (700) even if the supply pump (400) is not operated.
That is, according to the fuel supply system for a ship of the present embodiment, fuel can be stably supplied to the engine (100) without operating the supply pump (400) all the time.
The return line (L1) of the present embodiment branches from the line between the feed pump (400) and the pressurizing tank (500) and merges to the line between the feed pump (400) and the storage tank (300).
The fuel compressed by the feed pump (400) may also be supplied to the engine (100) after being additionally compressed by the circulation pump (700) and may also be delivered to the front end of the feed pump (400) through the return line (L1), while the fuel compressed by the feed pump (400) that is not used in the engine (100) continues to be circulated in such a manner as to be delivered to the front end of the feed pump (400) through the return line (L1) and compressed again by the feed pump (400).
Although a certain flow of fuel may be required to operate the feed pump (400), in the case where no fuel or only a small amount of fuel is required in the engine (100), all or a part of the fuel compressed by the feed pump (400) is circulated through the return line (L1).
A part of the return line (L1) is formed by a heat radiation pipe, and the fuel, which is compressed by the feed pump (400) and has a pressure and a temperature that are increased, can be made to pass through the heat radiation pipe while being reduced in temperature. Further, a fourth valve (40) that regulates the flow rate and opening/closing of the fuel may be provided in the return line (L1).
Conventionally, in the case where the pressurizing tank (500) is not included and the engine (100) is operated in the fuel mode, the supply pump (400) needs to be operated all the time in order to immediately supply the fuel, and therefore a return line (L1) for circulating the remaining fuel must be provided.
The circulation pump (700) of the present embodiment is provided at the rear ends of the feed pump (400) and the pressurizing tank (500), and pressurizes fuel. The circulation pump (700) of the present embodiment may be provided in parallel in plurality, and may be arranged so that another pump may be used in place of the pump when one or more pumps fail.
The circulation pump (700) of the present embodiment compresses fuel discharged from the pressurizing tank (500) or compresses fluid in which fuel discharged from the pressurizing tank (500) and fuel compressed by the feed pump (400) are combined, depending on the operation mode of the system.
That is, in the case where the amount of fuel required in the engine (100) is relatively small, the supply pump (400) is not operated, but only the fuel stored in the pressurizing tank (500) is supplied to the engine (100), so the circulation pump (700) compresses the fuel discharged from the pressurizing tank (500) and supplies it to the engine (100).
Further, in the case where the amount of fuel required in the engine (100) is relatively large, the required amount is made up by the supply pump (400) only by the shortage of fuel stored in the pressurizing tank (500), and therefore the circulation pump (700) compresses the fluid in which the fuel discharged from the pressurizing tank (500) is merged with the fuel compressed by the supply pump (400) and supplies it to the engine (100).
The temperature adjustment device (800) of the present embodiment is provided at the rear end of the circulation pump (700) and adjusts the fuel compressed by the circulation pump (700) to the temperature required by the engine (100). The temperature adjustment device (800) of the present embodiment may be a heater or may be a cooler depending on the configuration of the system.
The fuel supply system for a ship of the present embodiment may further include a water level detector (510) disposed inside the pressurizing tank (500).
The water level detector (510) of the present embodiment detects the level of fuel inside the pressurizing tank (500) to measure the amount of fuel inside the pressurizing tank (500). When the amount of fuel measured by the water level detector (510) is equal to or less than a first measurement value, a signal is transmitted from the water level detector (510) to the feed pump (400) to operate the feed pump (400).
The fuel compressed by the supply pump (400) that receives the signal from the water level detector (510) is delivered to the pressurizing tank (500), and when the amount of fuel inside the pressurizing tank (500) is equal to or greater than a second measurement value, the water level detector (510) transmits a signal to the supply pump (400) again to stop the operation of the supply pump (400).
The fuel supply system of the ship of the present embodiment may further include a duct (200) and an air removing device (210).
The pipe (200) of the present embodiment temporarily stores fuel that is used in the engine (100) and remains. The fuel stored in the pipe (200) is deaerated by the air-removing device (210), and the air removed by the air-removing device (210) is discharged to the outside.
The fuel from which air is removed by the air removing device (210) is delivered to the circulation pump (700) together with the fuel discharged from the pressurizing tank (500) or the fluid in which the fuel discharged from the pressurizing tank (500) is merged with the fuel compressed by the feed pump (400) and reused as the fuel for the engine.
According to the fuel supply system of the ship of the embodiment, air of the fuel used in the engine (100) and surplus is removed and circulated, so that air bubbles generated when the fuel is heated can be reduced to the maximum extent, and damage of the pump caused by the air mixed in the fuel can be reduced to the maximum extent.
In the case where the fuel supply system of the ship of the present embodiment includes the pipe (200), the fuel supply system may further include a first valve (10) provided on a line that delivers fuel from the pipe (200) to the storage tank (300).
The first valve (10) of the present embodiment is normally kept in a closed state, and is opened in a case where the amount of fuel inside the pipe (200) becomes excessive (hereinafter, referred to as "third measurement value") to enable fuel to be delivered from the pipe (200) to the storage tank (300).
In the case where the fuel supply system of the ship of the present embodiment includes the pipe (200), a bypass line (L2) branching from between the pipe (200) and the engine (100) and merging to between the pipe (200) and the storage tank (300) may be further included.
In the case where the present embodiment includes the bypass line (L2), the fuel used in the engine (100) and remaining may be delivered to the pipe (200), and may also be delivered to the storage tank (300) bypassing the pipe (200) and along the bypass line (L2), the bypass line (L2) is not used at ordinary times, but is used in the case of replacing the fuel or in the case where the pipe (200) is damaged and cannot be used, or the like.
The fuel supply system for a ship according to the present embodiment may further include a flow meter (600) that is provided between the pressurizing tank (500) and the engine (100) and measures the flow rate of the fuel.
The flow meter (600) of the present embodiment is provided at the rear ends of the feed pump (400) and the pressurizing tank (500), and therefore, the flow rate of the fuel delivered to the engine (100) can be confirmed both in the case where only the fuel discharged from the pressurizing tank (500) is supplied to the engine and in the case where the fluid in which the fuel discharged from the pressurizing tank (500) and the fuel compressed by the feed pump (400) are merged is delivered to the engine (100).
The fuel supply system of the ship of the present embodiment may further include a filtering device (900) that is provided at a front end of the engine (100) and filters foreign substances mixed in the fuel delivered to the engine (100).
In the case where the fuel supply system of the ship of the present embodiment further includes the pipe (200), the flow meter (600), and the filter device (900), an example of the flow of fuel is described as follows.
When the engine (100) is in the fuel mode, fuel stored in the pressurizing tank (500) and pressurized is discharged, passed through the flow meter (600), and then delivered to the circulation pump (700). The fuel pressurized by the circulation pump (700) is supplied to the engine (100) after passing through the temperature adjustment device (800) and the filter device (900). The fuel remaining after use in the engine (100) is delivered to the circulation pump (700) after being delivered to the pipe and mixed air is removed.
In the case where the required amount of the engine (100) cannot be filled only with the fuel stored in the pressurizing tank (500), the feed pump (400) is operated to compress the fuel discharged from the storage tank (300). The fuel compressed by the supply pump (400) is supplied to the engine (100) together with the fuel discharged from the pressurizing tank (500) through the flow meter (600), the circulation pump (700), the temperature control device (800), and the filter device (900).
When the engine (100) is in the gas mode, the feed pump (400) is operated in order to replenish the fuel consumed in the pressurizing tank (500), and the feed pump (400) compresses the fuel discharged from the storage tank (300) and delivers it to the pressurizing tank (500). In addition, even when the amount of fuel inside the pressurizing tank (500) becomes small due to leakage or the like occurring in the pressurizing tank (500) at ordinary times, the fuel discharged from the storage tank (300) can be compressed and delivered to the pressurizing tank (500) by operating the supply pump (400).
Fig. 2 is a schematic view of a fuel supply system of a ship according to a preferred second embodiment of the present invention.
The fuel supply system of the ship of the second embodiment shown in fig. 2 has a difference not including the return line (L1) as compared with the fuel supply system of the ship of the first embodiment shown in fig. 1, and the difference will be mainly explained hereinafter. Detailed description of the same components as those of the fuel supply system for a ship according to the first embodiment is omitted.
As in the first embodiment, referring to fig. 2, the fuel supply system of the ship of the present embodiment includes a storage tank (300), a supply pump (400), a pressurizing tank (500), a return line (L1), a circulation pump (700), and a temperature adjusting device (800).
The storage tank (300) of the present embodiment stores fuel, and the fuel stored in the storage tank (300) is supplied to the engine (100), as in the first embodiment. As in the first embodiment, a part of the fuel used and remaining in the engine (100) may be delivered to the storage tank (300), and a third valve (30) that regulates the flow rate of the fuel and opens and closes may be provided on a line that delivers the fuel used and remaining in the engine (100) to the storage tank (300).
The engine (100) that supplies fuel in the fuel supply system for a ship of the present embodiment is an engine that can use both gas and fuel as fuel, and may be an ME-GI engine, as in the first embodiment. Like the first embodiment, the engine (100) of the present embodiment can be operated in a gas mode using natural gas as a main fuel or in a fuel mode using fuel oil as a fuel.
The supply pump (400) of the present embodiment pressurizes the fuel discharged from the storage tank (300), as in the first embodiment. As in the first embodiment, a plurality of supply pumps (400) of the present embodiment may be provided in parallel, and may be arranged so that, in the case where one or more pumps have failed, the pumps may be replaced with other pumps.
The pressurizing tank (500) of the present embodiment is provided at the rear end of the feed pump (400), and receives compressed air from the outside and stores fuel in a pressurized state, as in the first embodiment. As in the first embodiment, a second valve (20) for adjusting the flow rate and opening/closing of the compressed air may be provided on the line for supplying the compressed air to the pressurizing tank (500).
The fuel supply system of the ship of the present embodiment may further include a fifth valve (50) that is disposed between the pressurizing tank (500) and the feed pump (400) and prevents the fuel discharged from the pressurizing tank (500) from flowing back to the feed pump (400), as in the first embodiment.
In the same manner as in the first embodiment, the fuel supply system for a ship according to the present embodiment preferentially supplies the fuel stored in the pressurizing tank (500) to the engine (100) when the engine (100) is operated in the fuel mode, and operates the supply pump (400) when the fuel stored in the pressurizing tank (500) is insufficient.
As in the first embodiment, according to the fuel supply system for a ship of the present embodiment, fuel can be stably supplied to the engine (100) without operating the supply pump (400) at all times.
The circulation pump (700) of the present embodiment is provided at the rear ends of the feed pump (400) and the pressurizing tank (500), and pressurizes the fuel, as in the first embodiment. As in the first embodiment, a plurality of circulation pumps (700) of the present embodiment may be provided in parallel, and may be arranged so that, in the case where one or more pumps have failed, the other pump may be used instead.
The circulation pump (700) of the present embodiment compresses only the fuel discharged from the pressurizing tank (500) and supplies it to the engine (100) in the case where the amount of fuel required in the engine (100) is relatively small, and compresses the fluid in which the fuel discharged from the pressurizing tank (500) merges with the fuel compressed by the supply pump (400) and supplies it to the engine (100) in the case where the amount of fuel required in the engine (100) is relatively large, as in the first embodiment.
The temperature adjustment device (800) of the present embodiment is provided at the rear end of the circulation pump (700) and adjusts the fuel compressed by the circulation pump (700) to the temperature required by the engine (100), as in the first embodiment. As in the first embodiment, the temperature control device (800) of the present embodiment may be a heater or a cooler.
The fuel supply system for a ship of the present embodiment may further include a water level detector (510) disposed inside the pressurizing tank (500), as in the first embodiment.
In the same manner as the first embodiment, when the level of the fuel inside the pressurizing tank (500) is detected so that the measured amount of the fuel is equal to or less than the first measurement value, the level detector (510) of the present embodiment transmits a signal to the feed pump (400) to operate the feed pump (400), and when the amount of the fuel inside the pressurizing tank (500) is equal to or more than the second measurement value, the level detector (510) transmits a signal to the feed pump (400) again to stop the operation of the feed pump (400).
The fuel supply system of the ship of the present embodiment may include a pipe (200) and an air removing device (210), as in the first embodiment.
The pipe (200) of the present embodiment temporarily stores fuel used and remaining in the engine (100), and the fuel stored in the pipe (200) is air-removed by the air removing device (210), and the air removed by the air removing device (210) is discharged to the outside, as in the first embodiment.
As in the first embodiment, the fuel from which air is removed by the air removing device (210) is delivered to the circulation pump (700) and reused as fuel for the engine.
In the case where the fuel supply system of the ship of the present embodiment includes the pipe (200), the same as in the first embodiment, may further include a first valve (10) provided on a line that delivers fuel from the pipe (200) to the storage tank (300).
The first valve (10) of the present embodiment is normally kept in a closed state as in the first embodiment, and is opened in a case where the amount of fuel inside the pipe (200) becomes excessive ("third measurement value") to enable fuel to be delivered from the pipe (200) to the storage tank (300).
In the case where the fuel supply system of the ship of the present embodiment includes the pipe (200), as in the first embodiment, a bypass line (L2) branching from between the pipe (200) and the engine (100) and merging to between the pipe (200) and the storage tank (300) may be further included.
As in the first embodiment, in the case where the present embodiment includes the bypass line (L2), the fuel used in the engine (100) and remaining may be delivered to the pipe (200), and may also be delivered to the storage tank (300) bypassing the pipe (200) and along the bypass line (L2), the bypass line (L2) not being used at ordinary times, but being used in the case of replacing the fuel or in the case where the pipe (200) is damaged and cannot be used, or the like.
The fuel supply system for a ship of the present embodiment may further include a flow meter (600) that is provided between the pressurizing tank (500) and the engine (100) and measures the flow rate of the fuel, as in the first embodiment.
The fuel supply system of the ship of the present embodiment may further include a filtering device (900) that is provided at the front end of the engine (100) and filters impurities mixed in the fuel delivered to the engine (100), as in the first embodiment.
However, unlike the first embodiment, the fuel supply system of the ship of the present embodiment does not include a return line (L1) that branches from a line between the supply pump (400) and the pressurizing tank (500) and merges to a line between the supply pump (400) and the storage tank (300).
According to the present invention, when the engine (100) is operated in the fuel mode, the fuel stored in the pressurizing tank (500) is preferentially used, and the feed pump (400) is not operated all the time, so that the fuel at the flow rate required for operating the feed pump (400) does not need to be continuously supplied regardless of the required amount of the engine (100), and the fuel that is not used in the engine (100) after being compressed by the feed pump (400) does not need to be circulated through the return line (L1).
Therefore, there is no problem according to the present invention without providing the return line (L1) as conventional, and according to the embodiment, the return line (L1) may be omitted, thus having an advantage that the system can be simplified.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art to which the present invention pertains that various modifications and variations can be made without departing from the technical spirit of the present invention.
Claims (19)
1. A fuel supply method of a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel, wherein compressed air is supplied to a pressurizing tank to store the fuel in a pressurized state;
supplying fuel stored in the pressurizing tank with a circulation pump in a case where the engine is operated in a fuel mode;
adjusting the fuel pressurized by the circulation pump to a temperature required by the engine by a temperature adjusting device; and
supplying the fuel passing through the thermostat to the engine.
2. The fuel supply method for a ship according to claim 1, wherein in a case where the fuel stored in the pressurizing tank cannot satisfy the demand of the engine, the fuel stored in the storage tank is pressurized by a supply pump and supplied to the engine.
3. The fuel supply method for a ship according to claim 2, wherein in a case where an amount of fuel inside the pressurizing tank is a first measured value or less, the fuel stored in the storage tank is pressurized and supplied to the pressurizing tank by the supply pump.
4. A fuel supply method of a ship according to claim 2 or 3, wherein fuel used in the engine and remaining is temporarily stored in a pipe and delivered to the circulation pump after air is removed.
5. The fuel supply method for a ship according to claim 4, wherein the fuel stored in the pipe is delivered to the storage tank when the amount of fuel in the inside of the pipe is above a third measurement value.
6. The fuel supply method for a ship according to claim 4, wherein fuel used in the engine and remaining is bypassed the pipe and delivered to the storage tank.
7. The fuel supply method for a ship according to claim 2, wherein the fuel discharged from the pressurizing tank is prevented from flowing backward toward the supply pump.
8. A fuel supply system of a ship that supplies fuel to an engine that uses both natural gas and fuel as fuel, comprising:
a storage tank storing fuel supplied to the engine;
a supply pump that pressurizes the fuel discharged from the storage tank;
a pressurizing tank that is provided at a rear end of the feed pump, and that receives compressed air and stores fuel in a pressurized state;
a circulation pump that is provided at a rear end of the pressurizing tank and pressurizes fuel; and
a temperature adjusting device that is provided at a rear end of the circulation pump and adjusts fuel pressurized by the circulation pump to a temperature required by the engine,
wherein the fuel stored in the pressurized tank is preferentially supplied to the engine when the engine is operated in a fuel mode.
9. The fuel supply system of a ship of claim 8, further comprising:
a return line that branches from a line between the feed pump and the pressurized tank and merges to a line between the feed pump and the storage tank,
wherein fuel that is not used in the engine among the fuel pressurized by the feed pump is circulated through the return line.
10. The fuel supply system for a ship of claim 9, wherein the return line includes a heat dissipation pipe.
11. The fuel supply system for a ship according to claim 8, wherein the circulation pump compresses the fuel discharged from the pressurizing tank or a fluid in which the fuel discharged from the pressurizing tank and the fuel pressurized by the supply pump are combined.
12. The fuel supply system of a ship of claim 8, further comprising:
a water level detector that is provided at an inside of the pressurizing tank and measures an amount of fuel stored in the pressurizing tank,
wherein the water level detector transmits a signal to the supply pump to operate the supply pump when the measured amount of fuel is equal to or less than a first measurement value, and transmits a signal to the supply pump to stop the operation of the supply pump when the measured amount of fuel is equal to or more than a second measurement value, and
in a case where the amount of fuel measured by the water level detector is equal to or less than the first measurement value, the supply pump pressurizes the fuel discharged from the storage tank to supply it to the pressurizing tank.
13. The fuel supply system of a ship of claim 8, further comprising:
a pipe temporarily storing fuel used in the engine and remaining; and
an air removing device that removes air contained in the fuel temporarily stored in the pipe,
the fuel from which air is removed by the air removing device is delivered to the circulation pump.
14. The fuel supply system for a ship of claim 13, further comprising:
a first valve that is opened to deliver the fuel stored in the pipe to the storage tank when the amount of fuel inside the pipe is a third measured value.
15. The fuel supply system for a ship of claim 13, further comprising:
a bypass line branched from and merged between the pipe and the engine and between the pipe and the storage tank,
wherein the fuel is supplied to the storage tank by bypassing the pipe through the bypass line.
16. The fuel supply system of a ship of claim 8, further comprising:
a flow meter that is provided at a rear end of the feed pump and the pressurizing tank and measures a flow rate of the fuel supplied to the engine.
17. The fuel supply system of a ship of claim 8, further comprising:
a filtering device provided at a front end of the engine and filtering impurities mixed in fuel delivered to the engine.
18. The fuel supply system of a ship according to any one of claims 8 to 17, further comprising:
a fifth valve that is provided between the feed pump and the pressurizing tank and prevents fuel discharged from the pressurizing tank from flowing back to the feed pump.
19. A fuel supply method of a ship, wherein, in a case where an engine is driven in a fuel mode, fuel stored in a pressurized state in a pressurized tank is preferentially supplied to the engine, and
in the case where the fuel stored in the pressurized state is insufficient, the fuel stored in the storage tank is pressurized by the supply pump to be supplied to the engine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2017/012082 WO2019088308A1 (en) | 2017-10-30 | 2017-10-30 | Fuel oil supply system and method for ship |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110770118A true CN110770118A (en) | 2020-02-07 |
| CN110770118B CN110770118B (en) | 2022-03-15 |
Family
ID=66332080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780091988.9A Active CN110770118B (en) | 2017-10-30 | 2017-10-30 | Fuel supply system and method for ship |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6910484B2 (en) |
| CN (1) | CN110770118B (en) |
| SG (1) | SG11201912007XA (en) |
| WO (1) | WO2019088308A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575972A (en) * | 2022-02-28 | 2022-06-03 | 东风商用车有限公司 | Valve group controlled gas-drive fuel and urea metering injection system and method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7344019B2 (en) * | 2019-06-24 | 2023-09-13 | 株式会社ジャパンエンジンコーポレーション | Marine internal combustion engine |
| JP7464478B2 (en) | 2020-08-24 | 2024-04-09 | 三菱造船株式会社 | Tank systems, ships |
| KR20230143846A (en) | 2022-04-06 | 2023-10-13 | 에이치디현대중공업 주식회사 | Apparatus for monitoring fuel oil tank level of ship |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6910484B2 (en) | 2021-07-28 |
| CN110770118B (en) | 2022-03-15 |
| JP2020523252A (en) | 2020-08-06 |
| SG11201912007XA (en) | 2020-01-30 |
| WO2019088308A1 (en) | 2019-05-09 |
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