KR-20260062237-A - Fuel Supply System and Method for Ships

KR20260062237AKR 20260062237 AKR20260062237 AKR 20260062237AKR-20260062237-A

Abstract

A ship fuel supply system is initiated. The above-described marine fuel supply system includes a compressor that compresses natural gas supplied to an engine to the engine's required pressure, mixes the mixed gas discharged during the purging operation of the gas supply line supplying natural gas to the engine with the natural gas, compresses the gas mixed with the mixed gas and the natural gas by the compressor, and then uses it as fuel for the engine.

Inventors

정성규
임종기
오세정

Assignees

한화오션 주식회사

Dates

Publication Date: 20260507
Application Date: 20241028

Claims (15)

It includes a compressor that compresses natural gas supplied to the engine to the engine's required pressure, and The mixed gas discharged during the purging operation of the gas supply line supplying natural gas to the above engine is mixed with natural gas, and A marine fuel supply system that compresses a mixture of the above-mentioned mixed gas and the above-mentioned natural gas by the above-mentioned compressor and uses it as fuel for the above-mentioned engine.
In claim 1, It includes a pressure vessel for storing mixed gas discharged during the purging operation of the above gas supply line, and A marine fuel supply system in which a mixed gas discharged from the above pressure vessel is mixed with the above natural gas.
In claim 1, A marine fuel supply system in which, after switching the engine from gas mode to fuel oil mode, the gas discharged from the gas supply line upon release of internal pressure of the gas supply line is compressed by the compressor and then used as fuel for the engine or re-liquefied.
In claim 2, A marine fuel supply system in which the mixed gas discharged during the purging operation of the above gas supply line is compressed by the above compressor and then stored in the above pressure vessel.
In claim 2, A marine fuel supply system that supplies a mixed gas inside the pressure vessel as fuel to the engine when the internal pressure of the pressure vessel is above a certain value.
In claim 2, It further includes a fourth valve installed in a flow path through which the fluid discharged from the pressure vessel is sent upstream of the compressor, and A marine fuel supply system that controls the flow rate of the mixed gas discharged from the pressure vessel by the fourth valve so that the gas mixed with the natural gas and the mixed gas supplied to the engine satisfies the calorific value per unit mass required by the engine.
In claim 6, A pressure transmitter installed in a flow path through which the fluid discharged from the pressure vessel is sent upstream of the compressor; and A flow transmitter installed in a flow path through which the fluid discharged from the pressure vessel is sent upstream of the compressor; further comprising one or more of the above. The above-mentioned fourth valve is a marine fuel supply system in which the opening is controlled by one or more of the pressure transmitter and the flow transmitter.
In claim 6, A pressure transmitter installed in a flow path through which the fluid discharged from the pressure vessel is sent upstream of the compressor; and It further includes an orifice installed in a flow path through which the fluid discharged from the pressure vessel is sent upstream of the compressor; and A marine fuel supply system that calculates a flow rate value based on the pressure difference between the upstream and downstream sides of the orifice and the size of the orifice, and controls the opening of the fourth valve based on the flow rate value and the pressure value measured by the pressure transmitter.
Mixing the mixed gas discharged during the purging operation of the gas supply line supplying natural gas to the engine with natural gas, and A method for supplying fuel for a ship, wherein the gas mixed with the above-mentioned mixed gas and the above-mentioned natural gas is compressed by a compressor and then used as fuel for the above-mentioned engine.
In claim 9, A method for supplying fuel to a ship, wherein the mixed gas discharged during the purging operation of the above gas supply line is stored in a pressure vessel, and the mixed gas discharged from the pressure vessel is mixed with natural gas.
In claim 9, A method for supplying fuel for a ship, wherein, after switching the engine from gas mode to fuel oil mode, the gas discharged from the gas supply line upon release of internal pressure of the gas supply line is compressed by the compressor and then used as fuel for the engine or re-liquefied.
In claim 10, A method for supplying fuel to a ship, wherein the mixed gas discharged during the purging operation of the above gas supply line is compressed by the above compressor and then stored in the above pressure vessel.
In claim 10, A method for supplying fuel to a ship, wherein the internal pressure of the pressure vessel is above a certain value and the mixed gas inside the pressure vessel is supplied as fuel to the engine.
In claim 10, A method for supplying fuel to a ship, wherein the gas mixed with the natural gas and the mixed gas supplied to the engine satisfies the calorific value per unit mass required by the engine, and the flow rate of the mixed gas discharged from the pressure vessel.
In claim 14, A method for supplying fuel to a ship, wherein the flow rate of a mixed gas discharged from a pressure vessel is controlled by one or more of the flow rate value and pressure value of the mixed gas discharged from the pressure vessel.

Description

Fuel Supply System and Method for Ships The present invention relates to a system and method for supplying fuel to a ship's engine. More specifically, it relates to a method for reducing the amount of greenhouse gases released into the atmosphere by treating vent gas generated from fuel pipes, which is one of the methane emissions produced during operation of a ship using liquefied natural gas (LNG) as fuel. Methane is one of the six major greenhouse gases, and it is the substance responsible for causing about 30% of total global warming and a temperature rise of 0.5°C. The Global Warming Potential (GWP) is a numerical representation of the extent to which each greenhouse gas contributes to global warming over 100 years based on one ton of carbon dioxide. Methane's GWP is calculated to be between 28 and 36, meaning that the impact of methane on global warming is 28 to 36 times greater than that of carbon dioxide. The international community is seeking cooperative measures to reduce methane emissions to curb global warming, and there is a need to develop technologies to reduce methane emissions from ships as well. The following methane-containing gases may be emitted during the process of using marine engines that use natural gas as fuel. 1) Methane slip emitted when methane is not completely burned due to improper combustion conditions, such as insufficient oxygen supply during the combustion process 2) Gas emitted when releasing pressure in the gas supply line when switching an engine capable of using both natural gas (gas mode) and fuel oil (fuel oil mode) as fuel from gas mode to fuel oil mode. 3) Gas emitted during the process of purging the natural gas inside the gas supply line with purging gas when switching an engine capable of using both natural gas (gas mode) and fuel oil (fuel oil mode) as fuel from gas mode to fuel oil mode, after the pressure in the gas supply line is released and drops below a certain value. 4) Gas emitted during the process of purging the internal purging gas of the gas supply line with natural gas when switching an engine capable of using both natural gas (gas mode) and fuel oil (fuel oil mode) as fuel from fuel oil mode to gas mode. In the above case, currently, methane slip or vent gas containing methane is being emitted into the atmosphere. However, since the global warming potential of methane is 28 times higher than that of carbon dioxide on a 100-year basis, there is a problem that the greenhouse gas reduction effect is reduced due to methane generated during operation, even though the amount of carbon dioxide generated during combustion is lower than that of oil. The content described in the background technology of the above invention is a description of background technology that is helpful for understanding the present invention, and does not mean prior art widely known to those skilled in the art. FIG. 1 schematically illustrates a fuel supply system for a ship according to one embodiment of the present invention. FIG. 2 schematically illustrates a fuel supply system for a ship according to another embodiment of the present invention. The structure and operation of a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The present invention can be applied not only in the field of ships and engine fuel supply but also in various facilities where methane is generated. Furthermore, the following embodiments may be modified in various other forms, and the scope of the present invention is not limited to the following embodiments. FIG. 1 schematically illustrates a fuel supply system for a ship according to one embodiment of the present invention. Referring to FIG. 1, the marine fuel supply system of the present embodiment includes a compressor (100) that compresses natural gas supplied to an engine to the required pressure of the engine. Additionally, the marine fuel supply system of the present embodiment may include one or more of a pressure vessel (200) that stores fluid compressed by the compressor (100), a first valve (V1) installed upstream of the compressor (100), a second valve (V2) installed in a path (20) through which the fluid compressed by the compressor (100) is sent to an engine or a re-liquefaction system, a third valve (V3) installed in a path through which the fluid compressed by the compressor (100) is sent to the pressure vessel (200), and a fourth valve (V4) installed in a path (30) through which the fluid discharged from the pressure vessel (200) is sent upstream of the compressor (100). The engine to which the present invention is applied may be a dual-fuel engine capable of using both natural gas (gas mode) and fuel oil (fuel oil mode) as fuel, and Marine Gas Oil (MGO) may be used as the fuel oil. The marine fuel supply system of this embodiment may be operated as follows. 1) When switching the engine from gas mode to fuel oil mode 1-1) When releasing internal pressure in the g