CN112302843B - Fuel supply system and fuel supply method for crude oil transport ship - Google Patents

Fuel supply system and fuel supply method for crude oil transport ship Download PDF

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Publication number
CN112302843B
CN112302843B CN202010722703.0A CN202010722703A CN112302843B CN 112302843 B CN112302843 B CN 112302843B CN 202010722703 A CN202010722703 A CN 202010722703A CN 112302843 B CN112302843 B CN 112302843B
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Prior art keywords
voc
fuel
crude oil
engine
mixer
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CN202010722703.0A
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CN112302843A (en
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林锺基
金南守
朴钟炫
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Hanhua Ocean Co ltd
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Hanhua Ocean Co ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • 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
    • 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
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • 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
    • F02D19/0639—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 characterised by the type of fuels
    • F02D19/0642—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F02D19/082—Premixed fuels, i.e. emulsions or blends
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/02—Mixing fluids
    • F17C2265/025—Mixing fluids different fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/031—Treating the boil-off by discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • 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
    • 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
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • 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
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Abstract

The present invention relates to a fuel supply system and a fuel supply method for a crude oil carrier. The supply system includes a VOC collection tank that collects a VOC in a gaseous state discharged from a crude oil storage tank without phase-changing it, a fuel storage tank that stores LNG to be used as fuel for an engine, a fuel pump that pressurizes and discharges LNG stored in the fuel storage tank, and a mixer that mixes LNG in a liquid state pressurized by the fuel pump with the VOC in a gaseous state discharged from the VOC collection tank, the engine being a two-stroke diesel cycle engine, the system including a mixed fuel supply line that connects the mixer and the engine and supplies mixed fuel mixed in the mixer to the engine, and a VOC supply line that connects the VOC collection tank and the mixer to deliver VOCs containing nitrogen and heavy hydrocarbon components from the VOC collection tank to the mixer.

Description

Fuel supply system and fuel supply method for crude oil transport ship
Technical Field
The present invention relates to a fuel supply system and a fuel supply method for a crude oil carrier, which can use a volatile organic compound generated in a crude oil tank of a crude oil carrier in which liquefied natural gas is used as a fuel for an engine.
Background
A crude oil transport ship is provided with a plurality of crude oil tanks (cargo tanks) capable of storing crude oil (crude oil). The crude oil stored in the crude oil storage tank evaporates and generates volatile organic compounds (VOCs; volatile Organic Compounds). In order to safely maintain the pressure of the crude oil tank, VOCs generated in the crude oil tank need to be discharged to the outside.
In particular, considerable amounts of VOC are generated when the crude oil storage tank is washed (cleaning) after loading (loading) the crude oil into the crude oil storage tank, in a full voyage (laden voyage), and unloading (discharging) the crude oil to a place of demand.
The components of the VOC contain almost all of the constituents of the crude oil stored in the crude oil storage tank, i.e., organic compounds. In the case of discharging VOC into the atmosphere, it is photochemically reacted with nitrogen oxides by sunlight, thereby generating ozone and photochemically oxidized substances, and causing environmental pollution such as causing photochemical smog, destroying ozone layers, and affecting the greenhouse effect.
Due to the harmful problem of the VOC, the international maritime organization and the like manage and control the VOC discharge of a part of ports. Furthermore, the emission of VOCs into the atmosphere eventually results in a considerable loss of active substances, and therefore methods are needed that can be recovered and effectively treated as compared to the emission of VOCs into the atmosphere.
Disclosure of Invention
Technical problem to be solved
As a technique for effectively treating VOCs, a VOC generation reduction technique (VOC reduction technology) for reducing the amount of VOCs generated when loading cargo, and a VOC recovery technique (VOC recovery technology) for recovering and treating the generated VOCs without discharging them to the atmosphere are generally applied.
A representative technique of VOC generation reduction techniques is to reduce the phenomenon of negative pressure generated in a crude oil tank when cargo is loaded into the crude oil tank, thereby adjusting the pressure of the tank to the vapor pressure (vapor pressure) of the crude oil.
VOC recovery technology is a technology for collecting and liquefying the generated VOC, and storing or supplying the VOC as fuel, and can be used by mounting expensive VOC treatment system equipment consisting of packets on a ship.
Further, since the VOC generated in the crude oil transportation ship has a high heavy hydrocarbon content, the amount of methane in the gas engine cannot be satisfied, and thus it is necessary to upgrade the VOC into methane as light hydrocarbon by using an reformer and supply the methane.
However, the fuel supply using the reformer requires maintenance and management for maintaining the performance of the reformer periodically, and since a large amount of heat energy such as steam is required to perform reforming, there is a problem in that additional fuel combustion is necessary.
The present invention aims to provide a fuel supply system and a fuel supply method of an improved crude oil transport ship capable of effectively supplying VOC generated in a ship as fuel of an engine with a simpler and lower cost without discharging the VOC generated in the ship into the atmosphere while using LNG as fuel.
Means for solving the problems
According to an aspect of the present invention for achieving the above object, there is provided a fuel supply system of a crude oil carrier including a VOC collection tank that collects a gaseous state VOC (Volatile Organic Compounds) discharged from a crude oil storage tank without phase-changing it, a fuel storage tank that stores LNG (Liquefied Natural Gas) to be used as fuel for an engine, a fuel pump that pressurizes and discharges LNG stored in the fuel storage tank, and a mixer that mixes LNG in a liquid state pressurized by the fuel pump with VOC in a gaseous state discharged from the VOC collection tank, wherein the engine is a two-stroke diesel cycle engine, and wherein the system further includes a mixed fuel supply line that connects the mixer and the engine and supplies mixed fuel mixed in the mixer to the engine, and a VOC supply line that connects the VOC collection tank and the mixer to deliver VOC containing nitrogen and heavy hydrocarbon components from the VOC collection tank to the mixer.
Preferably, a high-pressure pump compressing the mixed fuel in a liquid state mixed in the mixer to a high pressure required for the engine, and a vaporizer vaporizing the mixed fuel compressed by the high-pressure pump may be further included, and the mixed fuel in a gaseous state vaporized in the vaporizer may be supplied as the fuel of the engine through the mixed fuel supply line.
Preferably, a VOC valve which is provided on the VOC supply line and controls an opening and closing amount according to a nitrogen content of the VOC supplied from the VOC collection tank to the mixer may be further included.
Preferably, the fuel mixer may further include a control unit that controls an opening/closing amount of the VOC valve so that a nitrogen content of the mixed fuel mixed in the mixer is 30mol% or less.
Preferably, the engine may be a gas engine capable of using 100% ethane gas, 100% natural gas, a mixture of natural gas and VOC, and VOC as fuel.
Preferably, the high pressure pump may compress the mixed fuel to 200bar to 420bar.
Preferably, the mixer may be an ejector using LNG in the liquid state as a working fluid.
Preferably, a VOC collection line connecting the crude oil storage tank and the VOC collection tank to transfer VOCs containing nitrogen and heavy hydrocarbon components from the crude oil storage tank to the VOC collection tank may be further included, and the VOCs may be transferred from the crude oil storage tank to the VOC collection tank and from the VOC collection tank to the mixer without a pretreatment process to remove moisture and nitrogen.
According to another aspect of the present invention for achieving the above object, there is provided a fuel supply method of a crude oil carrier, the fuel supply method of the crude oil carrier comprising: collecting and storing the gaseous state containing nitrogen and heavy hydrocarbon components discharged from the crude oil storage tank in a gaseous state without causing a phase change in VOC (Volatile Organic Compounds) thereof; compressing LNG to be used as fuel for an engine; discharging the stored VOC to be mixed with the LNG in a compressed liquid state; and supplying a mixed fuel, which mixes the LNG and the VOC, to a two-stroke diesel cycle engine.
Preferably, in the step of mixing the LNG with the VOC, the LNG may be used as a working fluid to inhale the VOC in a gaseous state for mixing.
Preferably, the mixed fuel may be further compressed to a high pressure required for the engine, the mixed fuel compressed to the high pressure may be gasified, and the gasified mixed fuel in a gaseous state may be supplied to the engine.
Preferably, the flow rate of VOC in a gaseous state to be mixed with the compressed LNG may be adjusted so that the nitrogen content of the mixed fuel is 30mol% or less.
Effects of the invention
The fuel supply system and the fuel supply method of the crude oil transport ship of the present invention can simplify the process of recovering and reusing VOCs.
In addition, by simplifying the process of recovering and recycling the VOCs, the reuse rate of VOCs generated during the loading and sailing of crude oil can be maximized.
In particular, the apparatus for liquefying VOCs, the pretreatment apparatus for removing moisture or nitrogen from VOCs are not required, and thus by omitting additional apparatus, the installation cost, area and energy consumption cost can be reduced.
In addition, VOC can be recovered without using electric power, so that the amount of electric power used by the ship can be reduced.
By supplying the recovered VOC as fuel for the engine, it is possible to dispose of the VOC in an environmentally friendly manner without discharging the harmful VOC to the atmosphere.
Drawings
Fig. 1 is a configuration diagram schematically showing a fuel supply system of a crude oil carrier according to a first embodiment of the present invention.
Fig. 2 is a configuration diagram schematically showing a fuel supply system of a crude oil carrier according to a second embodiment of the present invention.
Fig. 3 is a configuration diagram schematically showing a fuel supply system of a crude oil carrier according to a third embodiment of the present invention.
Description of the reference numerals
100: crude oil storage tank
200: VOC collecting tank
300: fuel storage tank
400: fuel pump
501. 502, 503: high-pressure pump
601. 602, 603: gasifier
701. 702, 900: mixer
800: VOC compressor
1000: engine
VL1: VOC collection line
VL2, VL3: VOC supply line
FL: fuel supply line
ML1, ML2, ML3: mixed fuel supply line
Detailed Description
For a fuller understanding of the operational advantages of the present invention, as well as the objects attained by the embodiments of the present invention, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention.
The configuration and function of the preferred embodiment of the present invention will be described in detail hereinafter with reference to the accompanying drawings. Here, it should be understood that when reference numerals are given to constituent elements of respective drawings, the same constituent elements are given the same reference numerals as far as possible even though they are shown in different drawings. Further, the following embodiments may be modified into various other embodiments, and the scope of the present invention is not limited to the following embodiments.
In an embodiment of the invention described below, the liquefied gas may be a liquefied gas comprising methane and/or ethane, for example LNG (Liquefied Natural Gas), LEG (Liquefied Ethane Gas), LPG (Liquefied Petroleum Gas), liquefied ethylene gas (Liquefied Ethylene Gas).
However, in the embodiments described later, the case of LNG as a representative liquefied gas will be described as an example. LNG is primarily costly in terms of methane and includes ethane, propane, butane, etc., while its composition may vary depending on the place of production.
Further, although a case where the fuel supply system and the fuel supply method of the crude oil carrier according to an embodiment of the present invention described later are applied to a ship is described as an example, it may be used on land.
Further, in the embodiments described later, although the case where a ship is a crude oil transport ship (crude oil carrier or trude oil tank) that transports produced crude oil as cargo is described as an example, the present invention is applicable to all ships or offshore Floating structures that are provided with crude oil storage tanks and generate a considerable amount of VOC, potentially risking the environment, and that require fuel supply to engines, such as a Floating crude oil Production storage and handling facility (FPSO; floating, production Storage and Offloading Unit) that produces crude oil at sea, a petroleum product transport ship (product carrier) that transports produced crude oil, a Floating storage facility (FSU; floating and Storage Unit) that is capable of storing produced crude oil, and the like.
Further, in an embodiment of the present invention described later, the ship may be LFS (LNG Fuelled Ship) using LNG as fuel.
Further, in an embodiment of the present invention described later, liquefied gas and evaporated gas of the liquefied gas can be used as fuel for an engine, particularly for an engine of a ship.
First, a fuel supply system and a fuel supply method of a crude oil carrier according to a first embodiment of the present invention will be described with reference to fig. 1.
The fuel supply system of the crude oil carrier according to the first embodiment of the present invention includes one or more crude oil tanks (cargo tank) 100 storing crude oil, a VOC collection tank 200 collecting low-pressure VOC (VOC; volatile Organic Compounds) generated by vaporization of crude oil in the crude oil tanks 100 without phase-changing them, a fuel tank 300 storing Liquefied Natural Gas (LNG) to be used as fuel of an engine 1000 of the ship, a fuel pump 400 pressurizing LNG stored in the fuel tank 300 to be discharged to the outside from the fuel tank 300, a high-pressure pump 501 compressing LNG transported by the fuel pump 400 to a pressure range required for the engine 1000, a vaporizer 601 vaporizing LNG compressed by the high-pressure pump 501 to natural gas, a mixer 701 using high-pressure natural gas vaporized by the vaporizer 601 as a working (dring) fluid and sucking low-pressure VOC transported from the VOC collection tank 200 and mixing natural gas with VOC to be supplied as fuel of the engine 1000, and a fuel mixer 701 mixing VOC stored in the fuel tank 300 with VOC, and the natural gas collected by the vaporizer 200 or the natural gas mixed with VOC 1000.
The VOC collection line VL1 connects the crude oil tank 100 and the VOC collection tank 200, and the VOC discharged from the crude oil tank 100 is transported to the VOC collection tank 200 along the VOC collection line VL 1.
The VOC in the gaseous state discharged from the crude oil storage tank 100 is transported in the gaseous state along the VOC collection line VL1 as it is, and stored in the gaseous state in the VOC collection tank 200.
That is, in the present embodiment, the VOC stored in the VOC collection tank 200 does not undergo phase transition during transportation from the crude oil storage tank 100 to the VOC collection tank 200, during storage in the VOC collection tank 200, and during transportation from the VOC collection tank 200 to the mixer 701 along the VOC supply line VL 2.
Further, the VOC collection tank 200 of the present embodiment is provided with a smaller capacity than one crude oil storage tank 100.
The VOC discharged from the crude oil tank 100 includes not only hydrocarbon components of various carbon numbers but also impurities such as moisture or nitrogen.
While the composition of the VOC discharged from the crude oil tank 100 varies depending on the composition of the crude oil, propane, butane (especially n-butane) are generally used as the main component, and ethane, isobutane, n-pentane and isopentane, hexane, heptane, etc. are included in addition thereto.
In addition, when crude oil is loaded (loaded) into the crude oil tank 100 or unloaded (discharged) from the crude oil tank 100, nitrogen is supplied to the crude oil tank 100 as a means for realizing a smooth process or a means for shielding gas (shielding gas). Because the liquefaction temperature of nitrogen is lower than the liquefaction temperature of methane, which is the lowest in the liquefaction temperatures among the various hydrocarbons that can be included in the VOC, the VOC discharged from the crude oil storage tank 100 must contain nitrogen, although the contents are different.
However, the fuel supply system section according to the present embodiment includes a pretreatment device that removes impurities such as moisture or nitrogen from the VOC transferred from the crude oil storage tank 100 to the VOC collection tank 200.
That is, the VOC transferred from the crude oil storage tank 100 to the VOC collection tank 200 is not subjected to a pretreatment process. The VOC delivered from VOC collection tank 200 to mixer 701 is not subjected to a pretreatment process.
The VOC in the gaseous state collected in the VOC collection tank 200 is delivered to the mixer 701 without phase transition along the VOC supply line VL2 connecting the VOC collection tank 200 and the mixer 701.
A VOC valve CV capable of adjusting the flow rate of the VOC delivered from the VOC collection tank 200 to the mixer 701 is provided in the VOC supply line VL 2.
The VOC valve CV may be controlled based on the composition of the VOC delivered from the VOC collection tank 200 to the mixer 701.
For example, when the nitrogen content of the VOC transferred from the VOC collection tank 200 to the mixer 701 exceeds a reference value, the opening and closing amount of the VOC valve CV is controlled to reduce the flow rate of the VOC supplied from the VOC collection tank 200 to the mixer 701.
The reference value of the nitrogen content of the VOC transferred from the VOC collection tank 200 to the mixer 701 may be a value in which the nitrogen content of the mixed fuel mixed in the mixer 701 is the nitrogen content required for the engine (for example, 20mol% or less or 30mol% or less).
For example, when the heavy hydrocarbon content of VOC delivered from the VOC collection tank 200 to the mixer 701, particularly the heavy hydrocarbon content of 10 carbon atoms or more, exceeds the reference value, the opening and closing amount of the VOC valve CV is adjusted to reduce the flow rate of VOC supplied from the VOC collection tank 200 to the mixer 701.
The reference value of the heavy hydrocarbon of the VOC transferred from the VOC collection tank 200 to the mixer 701 may be a value that does not cause the mixed fuel mixed in the mixer 701 to be multi-phase (multi-phase). For example, the reference value for not rendering the mixed fuel heterogeneous may be a value in which the concentration of heavy hydrocarbons having 10 or more carbon atoms contained in the VOC is 1mol% or less.
The engine 1000 of the present embodiment may be a two-stroke (2-stroke) cycle engine. Further, the engine 1000 of the present embodiment can operate on the basis of a diesel cycle (diesel cycle) in which high-pressure gaseous fuel is directly injected into a combustion chamber near the top dead center of a piston.
Further, the pressure conditions of the gaseous fuel required for the engine 1000 of the present embodiment may be about 200bar to 420bar, or about 250bar to 380bar, and preferably, 380barg of high pressure gaseous fuel may be combusted.
Further, the temperature condition of the gas fuel required for the engine 1000 of the present embodiment may be about 35 ℃ to 45 ℃, and preferably, may be about 45 ℃.
Further, the engine 1000 of the present embodiment may be a gas engine capable of using 100% ethane gas, 100% natural gas, a mixture of natural gas and VOC, and VOC as fuel.
For example, in the present embodiment, engine 1000 may be an ME-GIE (MAN Electronic Gas Injection Ethane) engine from MAN ES corporation.
Further, the engine 1000 of the present embodiment uses LNG as a main fuel, and uses a mixed fuel of LNG (or natural gas) and VOC or VOC as a fuel of the engine with the amount of VOC generated.
That is, the ship of the present embodiment is based on a natural gas fuel ship that normally uses LNG as fuel.
LNG stored in the fuel tank 300 is pressurized by the fuel pump 400 and delivered to the high-pressure pump 501 along a fuel supply line FL connecting the fuel pump 400 and the high-pressure pump 501.
The fuel pump 400 may pressurize the LNG stored in the fuel tank 300 to about 10bar. However, the present invention is not limited thereto.
The high-pressure pump 501 compresses LNG pressurized by the fuel pump 400 to a gas fuel pressure required for the engine 1000 (i.e., a high pressure of about 380bar or more in the present embodiment) and supplies it to the gasifier 601.
LNG compressed to a high pressure by the high pressure pump 501 is transferred to the vaporizer 601 along a fuel supply line FL connecting the high pressure pump 501 and the vaporizer 601.
LNG compressed in the gasifier 601 to the high pressure required by the engine 1000 by the high pressure pump 501 (i.e., compressed to about 380bar in the present embodiment) is gasified to natural gas (gas state or supercritical state).
The natural gas gasified in the gasifier 601 is supplied to the mixer 701 along a fuel supply line FL connecting the gasifier 601 and the mixer 701.
LNG valves (not shown) that control the flow rate of LNG transferred from the fuel tank 300 to the mixer 701 may be provided at any one or more of between the fuel pump 400 and the high-pressure pump 501, between the high-pressure pump 501 and the vaporizer 601, and between the vaporizer 601 and the mixer 701.
The LNG valve may be controlled based on the amount of fuel required by the engine 1000, the heavy hydrocarbon or nitrogen content of the VOC delivered from the VOC collection tank 200 to the mixer 701.
The mixer 701 of the present embodiment may be an injector (projector) utilizing the bernoulli effect. The ejector 701 can inhale and mix VOCs transferred from the VOC collection tank 200 to the ejector 701 in an unpowered manner without using external power such as electric power by using high-pressure natural gas compressed to a high pressure (i.e., about 380bar in the present embodiment) required for the engine 1000 as a working (driving) fluid. The high pressure natural gas is mixed with VOC in a single phase in the mixer 701 and diffusion sprayed.
As in the present embodiment, when the ejector is used as the mixer 701, the fluid that is diffusion-ejected into the ejector promotes mixing during formation of a vortex in a curved shape, and thus natural gas and VOC can be easily uniformly mixed without using electric power.
The mixed fuel in which the natural gas and VOC are mixed in the injector 701 is supplied as the fuel of the engine 1000 along the mixed fuel supply line ML1 connecting the injector 701 and the engine 1000.
Subsequently, a fuel supply system and a fuel supply method of a crude oil carrier according to a second embodiment of the present invention will be described with reference to fig. 2. This embodiment is different from the first embodiment in which the mixer 701 is provided downstream of the high-pressure pump 501 in that the mixer 702 is provided upstream of the high-pressure pump 502 in this embodiment, as a modification of the first embodiment described above. Differences will be highlighted hereinafter, and detailed descriptions of the same components will be omitted. Even if detailed reference or explanation is omitted, the same components are applicable as those of the first embodiment described above.
The fuel supply system of the crude oil carrier according to the present embodiment includes one or more crude oil tanks (cargo tank) 100 storing crude oil, a VOC collection tank 200 collecting volatile organic compounds (VOCs; volatile Organic Compounds) generated by vaporization of crude oil in the crude oil tanks 100 without phase-changing them, a fuel tank 300 storing Liquefied Natural Gas (LNG) to be used as fuel of an engine 1000 of a ship, a fuel pump 400 pressurizing LNG stored in the fuel tank 300 to be discharged from the fuel tank 300 to the outside, a mixer 702 using LNG in a liquid state pressurized by the fuel pump 400 as a working (driving) fluid to inhale VOCs in a gas state delivered from the VOC collection tank 200 and mix the LNG with the VOCs, a high-pressure pump 502 compressing the mixed fuel in a liquid state mixed in the mixer 702 to a pressure range required for the engine 1000, a vaporizer 602 vaporizing the mixed fuel compressed by the high-pressure pump, and vaporizing the natural gas stored in the fuel tank 300 by the vaporizer 602 to discharge the LNG as the liquefied natural gas stored in the fuel tank 300, or the VOC in the tank 602 vaporizing the mixed fuel stored in the tank 200.
The VOC collection line VL1 connects the crude oil tank 100 and the VOC collection tank 200, and the VOC discharged from the crude oil tank 100 is transported to the VOC collection tank 200 along the VOC collection line VL 1.
The VOC generated by the evaporation of the crude oil in the crude oil tank 100 is in a gaseous state, is transported in a gaseous state along the VOC collection line VL1, and is stored in a gaseous state in the VOC collection tank 200.
Also, in the present embodiment, the VOC stored in the VOC collection tank 200 does not undergo phase change during transportation from the crude oil storage tank 100 to the VOC collection tank 200, during storage in the VOC collection tank 200, during transportation from the VOC collection tank 200 to the mixer 702 along the VOC supply line VL 2.
Further, the fuel supply system according to the present embodiment does not include a pretreatment device that removes impurities such as moisture or nitrogen from the VOC transferred from the crude oil storage tank 100 to the VOC collection tank 200.
The VOC in the gaseous state collected in the VOC collection tank 200 is delivered to the mixer 702 without phase transition along the VOC supply line VL2 connecting the VOC collection tank 200 and the mixer 702.
A VOC valve CV capable of adjusting the flow rate of VOC delivered from the VOC collection tank 200 to the mixer 702 is provided in the VOC supply line VL 2.
The VOC valve CV may be controlled based on the composition of the VOC delivered from the VOC collection tank 200 to the mixer 702. The control method is also applicable as same as the first embodiment.
The engine 1000 of the present embodiment operates as a two-stroke cycle engine that is based on the diesel cycle (diesel cycle).
LNG stored in the fuel tank 300 is pressurized by the fuel pump 400 and delivered to the mixer 702 along a fuel supply line FL connecting the fuel pump 400 and the mixer 702.
The mixer 702 of the present embodiment may be an injector (projector) that utilizes the bernoulli effect. The ejector 702 may use LNG in a liquid state pressurized by the fuel pump 400 as a working fluid and inhale VOCs in a gaseous state delivered from the VOC collection tank 200 to the ejector 702.
LNG pressurized by fuel pump 400 may be about 10barg or greater. However, the present invention is not limited thereto. The fuel pump 400 compresses the LNG to a degree that can condense out VOCs in the mixer 702.
LNG is mixed with VOCs in a mixer 702 as a single phase and diffusion sprayed. The VOC in a gaseous state is diffusely sprayed from the LNG in a compressed liquid state and condensed, and is mixed with the LNG in a liquid state.
The mixed fuel in which LNG and VOC are mixed in the injector 702 is delivered to the high-pressure pump 502 along a mixed fuel supply line ML2 connecting the injector 702 and the high-pressure pump 502.
The high-pressure pump 502 compresses the mixed fuel of LNG and VOC mixed in the mixer 702 to a gaseous fuel pressure required for the engine 1000 (i.e., a high pressure of about 380bar or more) and supplies it to the gasifier 602.
The mixed fuel compressed to a high pressure by the high-pressure pump 502 is delivered to the gasifier 602 along a mixed fuel supply line ML2 connecting the high-pressure pump 502 and the gasifier 602.
The mixed fuel compressed by the high pressure pump 502 to the high pressure required for the engine 1000 (i.e., about 380bar in the present embodiment) is gasified in the gasifier 602 into a gaseous state or a supercritical state.
The mixed fuel gas vaporized in the vaporizer 602 is supplied to the engine 1000 along a mixed fuel supply line ML2 connecting the vaporizer 602 and the engine 1000.
An LNG valve (not shown) that controls the flow of LNG transferred from the fuel tank 300 to the mixer 702 may be provided between the fuel pump 400 and the mixer 702.
Subsequently, a fuel supply system and a fuel supply method of a crude oil carrier according to a third embodiment of the present invention will be described with reference to fig. 3. This embodiment is a modification of the second embodiment, and is different from the second embodiment in which the ejector is provided as the mixer 702 in that the condenser is provided as the mixer 900, and further includes the VOC compressor 800. Differences will be highlighted hereinafter, and detailed descriptions of the same components will be omitted. Even if detailed reference or explanation is omitted, the same components are applicable as those of the second embodiment described above.
The fuel supply system of the crude oil carrier according to the present embodiment includes one or more crude oil tanks (cargo tank) 100 storing crude oil, a VOC collection tank 200 collecting volatile organic compounds (VOCs; volatile Organic Compounds) generated by vaporization of crude oil in the crude oil tanks 100 without phase-changing them, a fuel tank 300 storing Liquefied Natural Gas (LNG) to be used as fuel of an engine 1000 of a ship, a fuel pump 400 pressurizing LNG stored in the fuel tank 300 to be discharged from the fuel tank 300 to the outside, a mixer 900 mixing LNG pressurized by the fuel pump 400 with VOCs transferred from the VOC collection tank 200, a VOC compressor 800 compressing VOCs to be supplied from the VOC collection tank 200 to the mixer 900, a high-pressure pump 503 compressing the mixed fuel in a liquid state mixed in the mixer 900 to a pressure range required for the engine 1000, a vaporizer 603 vaporizing the mixed fuel compressed by the high-pressure pump 503, and a natural gas gasifying the LNG stored in the fuel tank 300, the fuel collected in the tank 603, or the VOC compressed by the vaporizer 200 as a gasification engine 603.
The VOC collection line VL1 connects the crude oil tank 100 and the VOC collection tank 200, and the VOC discharged from the crude oil tank 100 is transported to the VOC collection tank 200 along the VOC collection line VL 1.
The VOC generated by the evaporation of the crude oil in the crude oil tank 100 is in a gaseous state, is transported in a gaseous state along the VOC collection line VL1, and is stored in a gaseous state in the VOC collection tank 200.
Similarly, in the present embodiment, the VOC stored in the VOC collection tank 200 does not undergo phase change during transportation from the crude oil storage tank 100 to the VOC collection tank 200, during storage in the VOC collection tank 200, during transportation to the mixer 900.
Further, the fuel supply system according to the present embodiment does not include a pretreatment device that removes impurities such as moisture or nitrogen from the VOC transferred from the crude oil storage tank 100 to the VOC collection tank 200 and the VOC transferred from the VOC collection tank 200 to the mixer 900.
The VOC in the gaseous state collected in the VOC collection tank 200 is delivered to the VOC compressor 800 along the VOC supply line VL3 connecting the VOC collection tank 200 and the VOC compressor 800.
The VOC supply line VL3 is provided with a VOC valve CV capable of adjusting the flow rate of the VOC delivered from the VOC collection tank 200 to the VOC compressor 800.
The VOC valve CV may be controlled based on the composition of the VOC delivered from the VOC collection tank 200 to the mixer 900. The control method is applicable to the same as that of the first embodiment described above.
The engine 1000 of the present embodiment operates as a two-stroke cycle engine that is based on the diesel cycle (diesel cycle).
LNG stored in the fuel tank 300 is transferred to the mixer 900 along a fuel supply line FL connecting the fuel pump 400 and the mixer 900.
The mixer 900 of the present embodiment may be a condenser (condenser) that mixes LNG pressurized by the fuel pump 400 with VOC compressed by the VOC compressor 800 to condense out compressed VOC.
LNG pressurized by fuel pump 400 may be about 10barg or greater. However, the present invention is not limited thereto. The fuel pump 400 compresses the LNG to a pressure at which VOC can be condensed out in the mixer 900.
In addition, the VOC compressor 800 may compress the VOC to approximately the same pressure to which the LNG is compressed by the compression pump 400.
The mixed fuel in a liquid state in which LNG and VOC are mixed in the mixer 900 is sent to the high-pressure pump 503 along a mixed fuel supply line ML3 connecting the mixer 900 and the high-pressure pump 503.
The high-pressure pump 503 compresses the mixed fuel of LNG and VOC mixed in the mixer 900 to a gas fuel pressure required for the engine 1000 (i.e., a high pressure of about 380bar or more) and supplies it to the gasifier 603.
The mixed fuel compressed to a high pressure by the high-pressure pump 503 is delivered to the gasifier 603 along a mixed fuel supply line ML3 connecting the high-pressure pump 503 and the gasifier 603.
The mixed fuel compressed by the high-pressure pump 503 to a high pressure (i.e., about 380bar in the present embodiment) required for the engine 1000 is gasified in the gasifier 603 into a gaseous state or a supercritical state.
The mixed fuel gas vaporized in the vaporizer 603 is supplied to the engine 1000 along a mixed fuel supply line ML3 connecting the vaporizer 603 and the engine 1000.
An LNG valve (not shown) controlling the flow rate of LNG transferred from the fuel tank 300 to the mixer 900 may be provided between the fuel pump 400 and the mixer 900.
Conventional VOC treatment systems include a refrigeration cycle to liquefy the VOC and then store it in a storage tank or gasify the liquefied VOC (i.e., LVOC) to supply it to a portion of the engine that can use the VOC as fuel. Because LVOC is liquefied from VOCs, it contains relatively high concentrations of heavy hydrocarbons, especially heavy hydrocarbons that contain primarily large numbers of carbon atoms, as compared to before liquefaction.
In the liquefaction of VOC, SVOC containing a gas that has an extremely low boiling point and does not liquefy (for example, a low-carbon hydrocarbon such as nitrogen, methane, or ethane) is separated and used as a fuel for a boiler or a gas turbine.
Therefore, in the conventional VOC processing system, since the power consumption consumed in the freezing cycle and the like is very high, it occupies much space and is constituted by an expensive package, and thus the cost thereof is expensive. Furthermore, the VOC components vary depending on the residence time in the crude oil tank, and the longer the residence time is, the higher the heavy hydrocarbon component content is, and thus there is also a problem that the fuel supply is not smooth enough.
In addition, most engines are not capable of combusting not only SVOC with high nitrogen content but also LVOC with high heavy hydrocarbon content, and thus a method of reforming VOC into methane and supplying it as fuel has also been proposed. However, the reforming reaction itself requires a large amount of heat source, and since the reforming reaction system apparatus is bulky and cannot ensure safety when it is applied to a ship, there is a lot of burden in setting it on the ship.
However, according to the present invention, the pretreatment process of VOC, the upgrading process of VOC, the liquefaction process of VOC are omitted, and by mixing VOC with LNG and supplying it as fuel for an engine, the cost or physical space burden according to power consumption, installation space can be significantly reduced. In addition, it is environmentally friendly because harmful VOCs may not be discharged to the atmosphere but be recovered entirely and used as fuel.
As described above, the embodiments according to the present invention are reviewed, and it will be apparent to those of ordinary skill in the art to which the present invention pertains that the present invention may be implemented in other specific forms in addition to the foregoing embodiments without departing from the spirit or scope of the present invention. The present embodiments are, therefore, to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.

Claims (10)

1. A fuel supply system for a crude oil carrier, comprising:
a VOC collection tank that collects VOC in a gaseous state discharged from a crude oil storage tank without causing phase change thereof;
a fuel tank that stores LNG to be used as fuel for an engine;
a fuel pump that pressurizes and discharges LNG stored in the fuel tank; and
a mixer that mixes LNG in a liquid state pressurized by the fuel pump with VOC in a gaseous state discharged from the VO C collecting tank,
wherein the engine is a two-stroke diesel cycle engine,
and wherein the fuel supply system of the crude oil carrier further comprises:
a mixed fuel supply line that connects the mixer and the engine, and supplies the mixed fuel mixed in the mixer to the engine;
a VOC supply line connecting the VOC collection tank with the mixer to deliver VOCs containing nitrogen and heavy hydrocarbon components from the VOC collection tank to the mixer;
a high-pressure pump compressing the mixed fuel in a liquid state mixed in the mixer to a high pressure required for the engine; and
a gasifier that gasifies the mixed fuel compressed by the high-pressure pump,
wherein the mixed fuel in a gaseous state vaporized in the vaporizer is supplied as the fuel of the engine through the mixed fuel supply line.
2. The crude carrier fuel supply system of claim 1, further comprising:
a VOC valve which is provided on the VOC supply line and controls an opening and closing amount according to a nitrogen content of the VOC supplied from the VOC collection tank to the mixer.
3. The crude oil carrier fuel supply system of claim 2, further comprising:
and a control unit that controls the amount of opening and closing of the VOC valve so that the nitrogen content of the mixed fuel mixed in the mixer is 30mol% or less.
4. The crude oil carrier fuel supply system of claim 1, wherein the engine is a gas engine capable of using 100% ethane gas, 100% natural gas, a mixture of natural gas and VOC, and VOC as fuel.
5. The crude oil carrier fuel supply system of claim 1, wherein the high pressure pump compresses the mixed fuel to 200bar to 420bar.
6. The fuel supply system of a crude oil carrier according to claim 1, wherein the mixer is an ejector using the LNG in the liquid state as a working fluid.
7. The crude carrier fuel supply system of claim 1, further comprising:
a VOC collection line connecting the crude oil storage tank and the VOC collection tank to deliver VOC containing nitrogen and heavy hydrocarbon components from the crude oil storage tank to the VOC collection tank,
wherein the VOC is transported from the crude oil storage tank to the VOC collection tank and from the VOC collection tank to the mixer without a pretreatment process to remove moisture and nitrogen.
8. A fuel supply method for a crude oil carrier, comprising:
collecting and storing the VOC in a gaseous state containing nitrogen and heavy hydrocarbon components discharged from the crude oil storage tank in a gaseous state without causing a phase change of the VOC;
compressing LNG to be used as fuel for an engine;
discharging the stored VOC to be mixed with the LNG in a compressed liquid state;
supplying a mixed fuel, in which the LNG and the VOC are mixed, to a two-stroke diesel cycle engine; and
the mixed fuel is further compressed to a high pressure required for the engine, the mixed fuel compressed to the high pressure is gasified, and the mixed fuel in a gasified gaseous state is supplied to the engine.
9. The fueling method of the crude oil carrier of claim 8 wherein in the step of mixing the LNG with the VOC, the LNG is used as a working fluid to inhale the VOC in a gaseous state for mixing.
10. The fueling method of the crude oil carrier of claim 8 wherein the flow rate of the VOC in a gaseous state to be mixed with the compressed LNG is adjusted so that the nitrogen content of the mixed fuel is 30mol% or less.
CN202010722703.0A 2019-07-26 2020-07-24 Fuel supply system and fuel supply method for crude oil transport ship Active CN112302843B (en)

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