Ship

Abstract

A ship includes: a cargo hold that stores liquefied gas transported on the ship as cargo; a reformer supplying methane, carbon dioxide, and water to produce a synthesis gas including hydrogen and carbon monoxide; an FT processing unit supplying the syngas produced in the reformer and converting the syngas into liquid hydrocarbons; and an exhaust line extending from the cargo hold to the reformer, in which boil-off gas generated by liquefied gas in the cargo hold is supplied to the reformer through the exhaust line for generation of syngas.

Description

Technical Field

[0001] The present invention relates to a ship, and more particularly, to a ship that can discharge evaporation gas generated from liquefied gas in a cargo hold to a reformer to produce syngas, and can convert the syngas into liquid hydrocarbons in an FT processing unit to supply the fuel to a consumption location on the ship. Background Art

[0002] As global warming intensifies, various efforts have been made globally to reduce greenhouse gas emissions.

[0003] As the Kyoto Protocol, which stipulated the obligation of developed countries to reduce greenhouse gas emissions, expired in 2020, the Paris Climate Change Accord, which was adopted at the 21st Conference of the Parties to the United Nations Framework Convention on Climate Change held in Paris, France in December 2015 and came into force in November 2016, has prompted 195 parties to the accord to make various efforts to reduce greenhouse gas emissions.

[0004] With this global trend, as a pollution-free energy alternative to fossil fuels and nuclear power, interest in renewable energy (or new energy) such as wind power, photovoltaic power, solar thermoelectric power, bioenergy, tidal energy, geothermal energy, etc. is increasing, and various technologies are being developed in this field.

[0005] As a specialized agency of the United Nations established to internationally coordinate shipping routes, traffic rules, port facilities, etc., the International Maritime Organization (IMO) estimates that greenhouse gas emissions from ships will increase from 2.7% in 2007 to 12% - 18% in 2050, and has added "prevention of air pollution" to Annex VI of the MARPOL Convention to designate SOx (sulfur compounds), NOx (nitrogen oxides), and ODS (ozone-depleting substances) as regulated substances to prevent air pollution caused by ships.

[0006] Therefore, in recent years, technologies using liquefied gas such as LNG, LPG, CNG, DME, etc. have received attention in this field as fuels for ships. In particular, since LNG emits 20% less carbon dioxide than petroleum fuels such as marine grade C fuel oil, and hardly emits nitrogen oxides and sulfur oxides, which are the main causes of air pollution, LNG is evaluated as an environmentally friendly fuel compared to other fossil fuels. As a result, with the trend of strengthening international emission regulations, the number of ships using LNG as a propulsion fuel is increasing, including not only LPG or LNG tankers, but also general ships.

[0007] Although LNG is considered a cleaner fuel than other fossil fuels, LNG still produces carbon dioxide when burned, and ships fueled with LNG emit carbon dioxide during ship operation. Summary of the Invention

[0008] Technical Problem

[0009] The International Maritime Organization (IMO) has set a goal of reducing greenhouse gases by 50% by 2050 and 100% by 2100 (GHG zero emission) compared to 2008, and thus it is expected that regulations in various countries and regions will be strengthened.

[0010] According to the Energy Efficiency Design Index (EEDI), which is the IMO's mandatory carbon dioxide reduction regulation for newly built ships, the initial EEDI announcement required EEDI Phase 1, which required a 10% reduction in carbon dioxide emissions based on the carbon dioxide emissions from 2015 to 2013 in 2015, and EEDI Phase 3 is planned to be applied in 2025 with a step - by - step increase every five years. However, for LPG carriers, EEDI Phase 3 will be applied two years earlier than EEDI Phase 2, in 2022, and requires ships ordered after 2030 to reduce carbon emissions by 40% compared to ships ordered in 2008, and by 50% by 2050. Thus, as international attention to climate change and greenhouse gas emissions grows, regulations on ship carbon dioxide emissions are tightening rapidly.

[0011] In line with this trend of tightening regulations, various technologies are being studied, including the development of environmentally friendly fuel technologies that do not emit carbon dioxide, and technologies for capturing carbon dioxide from fossil fuel combustion gases and converting or liquefying the captured carbon dioxide into methane or methanol. In particular, since it is inevitable to use fossil fuels before the development of economically viable renewable energy technologies, it is also necessary to develop technologies that can capture and effectively process carbon dioxide generated by the use of fossil fuels.

[0012] On the other hand, liquefied gases such as LNG, LPG, and liquefied carbon dioxide are cooled and liquefied to facilitate storage and transportation by ship. Due to the heat transferred to the cargo hold during their transportation, boil-off gas (BOG) that continuously undergoes spontaneous vaporization is generated. The generation of boil-off gas in the cargo hold causes an increase in the internal pressure of the cargo hold, and when the internal pressure of the cargo hold exceeds the preset safety pressure, emergencies such as the rupture of the container can occur. Since boil-off gas is a loss of cargo and an important issue in the transportation efficiency of liquefied gases, a solution that can safely and effectively handle the boil-off gas generated in the cargo hold is needed.

[0013] One aspect of the present invention is to provide a method for effectively treating the boil-off gas generated in the cargo hold while effectively treating carbon dioxide.

[0014] Technical solution

[0015] According to one aspect of the present invention, a ship is provided, including: a cargo hold for storing liquefied gas transported as cargo on the ship;

[0016] A reformer that supplies methane, carbon dioxide, and water to produce syngas including hydrogen and carbon monoxide;

[0017] An FT processing unit that is supplied with the syngas produced in the reformer and converts the syngas into liquid hydrocarbons; and

[0018] An exhaust pipeline that extends from the cargo hold to the reformer,

[0019] wherein the boil-off gas generated from the liquefied gas in the cargo hold is supplied to the reformer through the exhaust pipeline for the production of syngas.

[0020] The ship can be an LNG carrier, the liquefied gas in the cargo hold can be LNG, the boil-off gas generated from the LNG in the cargo hold can be discharged to the reformer through the exhaust pipeline, and the liquid hydrocarbons produced in the FT processing unit can be supplied as fuel to the on-board consumption locations on the ship.

[0021] The ship can further include: a carbon dioxide tank for storing liquefied carbon dioxide; and a fuel supply pipeline that extends from the carbon dioxide tank to the reformer and supplies the evaporated gas of carbon dioxide generated in the carbon dioxide tank to the reformer.

[0022] The ship may further include: a transfer pump arranged to the carbon dioxide tank to pump liquefied carbon dioxide; and an in-line mixer arranged to the fuel supply line, wherein when the amount of evaporated gas of carbon dioxide generated in the carbon dioxide tank is less than the amount of carbon dioxide required for the reformer, the liquefied carbon dioxide transferred by the transfer pump is mixed with the evaporated gas of carbon dioxide in the in-line mixer and supplied to the reformer.

[0023] The ship may further include: a liquid supply line along which LNG stored in the cargo hold is supplied outside the cargo hold; and an LNG supply pump arranged to the cargo hold and transferring LNG to the liquid supply line, wherein when the amount of evaporated gas generated in the cargo hold is less than the amount of methane required for the reformer, the LNG transferred by the LNG supply pump is supplied to the reformer.

[0024] The ship may further include: an LNG booster pump arranged to the liquid supply line and pressurizing LNG depending on the fuel supply pressure of the main propulsion engine; and a forced vaporizer heating the LNG pressurized in the LNG booster pump depending on the fuel supply temperature of the main engine and supplying the heated LNG to the main engine, wherein the on-board consumption locations include a power generation engine and a boiler.

[0025] The on-board consumption locations may include a main propulsion engine, a power generation engine, and a boiler.

[0026] The ship may be a carbon dioxide carrier and may further include a fuel tank storing LNG to be supplied as on-board fuel, wherein the liquefied gas in the cargo hold is liquefied carbon dioxide.

[0027] The ship may further include: a gas supply line extending from the fuel tank to the reformer and supplying the evaporated gas generated from LNG in the fuel tank to the reformer.

[0028] The ship may further include: a liquid supply line along which LNG stored in the fuel tank is supplied outside the fuel tank; and an LNG supply pump arranged to the fuel tank and transferring LNG to the liquid supply line, wherein when the amount of evaporated gas generated in the fuel tank is less than the amount of methane required for the reformer, the LNG transferred by the LNG supply pump is supplied to the reformer.

[0029] The ship may further include: an LNG booster pump arranged to the liquid supply line and pressurizing LNG depending on the fuel supply pressure of the main propulsion engine; and a forced vaporizer heating the LNG pressurized in the LNG booster pump depending on the fuel supply temperature of the main engine and supplying the heated LNG to the main engine, wherein the on-board consumption locations include a power generation engine and a boiler.

[0030] The ship may further include: a transfer pump provided to the cargo hold for pumping liquefied carbon dioxide; and an in-line mixer provided to the exhaust pipeline, wherein when the amount of evaporated gas of carbon dioxide generated in the cargo hold is less than the amount of carbon dioxide required for the reformer, the liquefied carbon dioxide transferred by the transfer pump is mixed with the evaporated gas of carbon dioxide in the in-line mixer and supplied to the reformer, and the on-board consumption locations include a main engine for propulsion, a power generation engine, and a boiler.

[0031] Carbon dioxide contained in the exhaust gas generated in the main engine for propulsion, the power generation engine, and the boiler can be captured and supplied to the reformer.

[0032] Advantageous Effects

[0033] Embodiments of the present invention provide a ship that can produce syngas from the evaporated gas generated from LNG in the cargo hold and can convert the syngas into liquid hydrocarbons to supply the liquid hydrocarbons as fuel for on-board consumption locations.

[0034] In this way, the ship according to the embodiments of the present invention can effectively handle the evaporated gas generated from LNG in the cargo hold, thereby preventing an increase in the internal pressure of the cargo hold when ensuring the safety of the ship.

[0035] Embodiments of the present invention provide a ship that can produce syngas from the carbon dioxide evaporated gas generated from liquefied carbon dioxide in the cargo hold and can convert the syngas into liquid hydrocarbons to supply as fuel for on-board consumption locations.

[0036] In this way, the ship according to the embodiments of the present invention can prevent an increase in the internal pressure of the cargo hold, ensure safety, and can use the evaporated gas as fuel at consumption locations such as a power generation engine by effectively handling the evaporated gas of carbon dioxide generated in the cargo hold, thereby achieving a reduction in operating costs and an increase in energy efficiency.

[0037] In addition, the ship according to the embodiments of the present invention captures carbon dioxide from the exhaust gas generated by the main engine, the power generation engine, etc. to use the carbon dioxide for the production of syngas, thereby minimizing carbon dioxide emissions during ship operation. Description of the Drawings

[0038] Figure 1 is a schematic diagram of a ship according to a first embodiment of the present invention.

[0039] Figure 2 is a schematic diagram of a ship according to a second embodiment of the present invention.

[0040] Figure 3 is a schematic diagram of a ship according to a third embodiment of the present invention.

[0041] Figure 4 It is a schematic view of a ship according to a fourth embodiment of the present invention. Detailed implementation manners

[0042] To fully understand the operational advantages of the present invention and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings, which illustrate the preferred embodiments of the present invention and their descriptions.

[0043] Hereinafter, the features and effects of exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0044] As used herein, the term "ship" may refer to any type of ship provided with an LNG cargo hold, in which methane is generated as boil-off gas, and may include self-propelled ships such as LNG carriers and regasification vessels (RVs), and non-self-propelled floating offshore structures such as floating production storage offloading (FPSO) structures and floating storage regasification unit (FSRU) structures.

[0045] Figure 1 and Figure 2 show ships according to the first and second embodiments of the present invention. More specifically, Figure 1 is a schematic view of a fuel supply system of an LNG carrier according to a first embodiment of the present invention, and Figure 2 is a schematic view of a fuel supply system of an LNG carrier according to a second embodiment of the present invention.

[0046] Referring to Figure 1 , the fuel supply system according to the first embodiment includes a plurality of cargo holds (CTa, CTb, CTc), each of which stores LNG transported as the cargo of the ship; a reformer (100) that supplies methane, carbon, and water to produce syngas including hydrogen and carbon monoxide; an FT processing unit (200) that supplies the syngas produced in the reformer (100) and converts the syngas into liquefied hydrocarbons; and an exhaust gas pipeline (BL) extending from the cargo hold to the reformer.

[0047] The boil-off gas generated from the LNG in the cargo holds (CTa, CTb, CTc) is discharged through the exhaust gas pipeline to the reformer (100) to be processed therein, and the liquefied hydrocarbons generated in the FT processing unit (200) are supplied as fuel for on-board consumption at position (C).

[0048] The ship is provided with a carbon dioxide tank (FT) that stores liquefied carbon dioxide to supply carbon dioxide to a reformer (100) for the production of syngas.

[0049] The carbon dioxide tank (FT) can be realized by a pressure vessel capable of maintaining the internal pressure above the triple point of carbon dioxide and stores carbon dioxide in a liquid state. Since carbon dioxide has a triple point at approximately 5.18 bara and -56.7 °C, carbon dioxide transforms into a solid phase to form dry ice when cooled at atmospheric pressure. Therefore, the ship is provided with a carbon dioxide tank (FT) realized by a pressure vessel and capable of storing carbon dioxide in a liquid state, which allows for more efficient transportation and storage than in the solid state by maintaining the internal pressure of the carbon dioxide tank above the pressure of the triple point of carbon dioxide while maintaining the temperature of the tank at a temperature less than or equal to the boiling point of carbon dioxide.

[0050] The evaporation of carbon dioxide generated in the carbon dioxide tank (FT) is discharged from the carbon dioxide tank and supplied to the reformer (100) for the production of syngas. For this purpose, a fuel supply line (FL) extends from the carbon dioxide tank to the reformer.

[0051] The reformer (100) receives methane of LNG evaporation gas supplied from a cargo hold along an exhaust gas line (BL), carbon dioxide supplied from the carbon dioxide tank along the fuel supply line, and water to produce syngas including hydrogen and carbon monoxide through reforming gasification as follows.

[0052] 2CH4+CO2+H2O→5H2+3CO

[0053] The syngas produced in the reformer is supplied to an FT processing unit (200), where the syngas is converted into liquid hydrocarbons (GTL, gas to liquid), such as diesel, naphtha, etc., through a Fischer-Tropsch synthesis reaction in the presence of a catalyst such as cobalt (Co), iron (Fe), etc. The FT processing unit can produce liquid hydrocarbons including diesel required for on-board consumption locations to supply the liquid hydrocarbons as fuel thereto.

[0054] 5H2+3CO→GTL fuel

[0055] In this embodiment, the main engine (ME) for ship propulsion can be fuel-supplied with LNG from the cargo hold, and consumption points (C), such as a power generation engine, an auxiliary boiler, etc., can be fuel-supplied with liquid hydrocarbons produced through the reformer and the FT processing unit.

[0056] The ship may be provided with a liquid supply line (LL) along which LNG stored in the cargo holds (CTa, CTb, CTc) is supplied outside the cargo holds, and LNG supply pumps (CP) provided to each cargo hold to pump (CP) LNG to the liquid supply line. The liquid supply line is provided with an LNG booster pump (300) that pressurizes the LNG according to the fuel supply pressure of the main propulsion engine, and a forced vaporizer (350) that heats the pressurized LNG according to the fuel supply temperature of the main engine and supplies the heated LNG to the main engine. Thus, LNG can be supplied from the cargo hold to the main engine as fuel through pressurization and heating.

[0057] When the amount of evaporation gas generated in the cargo hold is less than the amount of methane required by the reformer, the LNG pumped through the LNG supply pump can be supplied to the reformer. For this purpose, the liquid supply line (LL) may branch upstream of the LNG booster pump (300) and be connected to the reformer along line LL1 and to the LNG booster pump along line (LL2) respectively.

[0058] The evaporation gas of carbon dioxide generated in the carbon dioxide tank is supplied to the reformer so that, when the amount of evaporation gas of carbon dioxide generated in the carbon dioxide tank is less than the amount of carbon dioxide required by the reformer, the liquefied carbon dioxide pumped through the transfer pump (FP) provided on the carbon dioxide tank can be mixed with the evaporation gas of carbon dioxide in the in-line mixer (150) provided on the fuel supply line (FL) to be supplied to the reformer.

[0059] Since hydrocarbon fuel is used for the main propulsion engine, the power generation engine and the boiler, the exhaust gas contains carbon dioxide. The carbon dioxide contained in the exhaust gas can be captured and supplied to the reformer or can be captured and liquefied to be stored in the carbon dioxide tank.

[0060] Figure 2 is a schematic diagram of a ship according to a second embodiment of the present invention, in which the main propulsion engine is also configured to receive the liquid hydrocarbons generated in the FT processing unit.

[0061] That is, the ship according to the first embodiment is configured to supply the LNG in the cargo hold to the main engine while supplying liquid hydrocarbons to the power generation engine, the boiler, etc., while the ship according to the second embodiment is configured to supply liquid hydrocarbons not only to the power generation engine and the boiler but also to the main engine as a shipboard consumption location.

[0062] The liquid supply line (LL) extending from the cargo holds (CTa, CTb, CTc) is connected only to the reformer (100) without any branches, and the LNG pumped through the LNG supply pump (CP) is supplied to the reformer as fuel for producing syngas and liquid hydrocarbons.

[0063] The boil-off gas generated in the plurality of cargo holds is first supplied to the reformer, and when the amount of boil-off gas generated in the cargo hold is less than the amount of methane required by the reformer, the LNG transported by the LNG supply pump can be supplied to the reformer.

[0064] Thus, the systems according to the first and second embodiments can produce ship fuel by effectively treating the boil-off gas generated in the cargo hold and transport it to the on-board consumption location, while safely maintaining the internal pressure of the cargo hold of the LNG carrier, thereby reducing the ship operation cost and carbon dioxide emissions during ship operation.

[0065] The ships according to the third and fourth embodiments of the present invention described below are carbon dioxide carriers and can be any type of ship provided with a cargo hold for storing liquefied carbon dioxide and a fuel tank for storing LNG to be supplied as ship fuel for producing syngas.

[0066] Figure 3 and Figure 4 shows a ship according to the third and fourth embodiments of the present invention. More specifically, Figure 3 is a schematic diagram of a boil-off gas treatment system of a carbon dioxide carrier according to the third embodiment of the present invention, and Figure 4 is a schematic diagram of a boil-off gas treatment system of a carbon dioxide carrier according to the fourth embodiment of the present invention.

[0067] As Figure 3 and Figure 4 shown, the boil-off gas treatment systems according to the third and fourth embodiments are configured to treat the boil-off gas of carbon dioxide generated in the cargo hold of the ship, which stores liquefied carbon dioxide transported as the cargo of the ship.

[0068] The ship is provided with a plurality of cargo holds (CTa, CTb, CTc) for storing liquefied carbon dioxide and a fuel tank (FT) for storing LNG to be supplied as ship fuel. In these embodiments, the main engine (ME) for ship propulsion can be supplied with LNG fuel from the fuel tank.

[0069] The system according to the third embodiment includes: a reformer (100) that supplies methane, carbon dioxide, and water to produce syngas including hydrogen and carbon monoxide; and an FT treatment unit (200) that supplies the syngas produced in the reformer and converts the syngas into liquid hydrocarbons, wherein an exhaust pipeline (BL) extends from the cargo hold to the reformer, and a gas supply pipeline (GL) extends from the fuel tank to the reformer, such that the boil-off gas generated from the LNG in the fuel tank is supplied to the reformer.

[0070] Vaporized gas of carbon dioxide generated from liquefied carbon dioxide in the cargo tanks (CTa, CTb, CTc) is discharged from the cargo tanks along the exhaust pipeline (BL) and then supplied to a reformer for producing syngas.

[0071] The cargo tanks (CTa, CTb, CTc) can be implemented by pressure vessels capable of maintaining the internal pressure above the triple point of carbon dioxide and store carbon dioxide in a liquid state. Since carbon dioxide has a triple point of about 5.18 bara and -56.7 °C, carbon dioxide turns into a solid phase to form dry ice when cooled at normal pressure. Therefore, the ship is provided with cargo tanks (CTa, CTb, CTc) implemented by pressure vessels capable of withstanding pressure and can store carbon dioxide in a liquid state, which allows for more efficient transportation and storage than in the solid state by maintaining the internal pressure of the cargo tanks above the pressure of the triple point of carbon dioxide while maintaining the temperature of the cargo tanks at a temperature less than or equal to the boiling point of carbon dioxide.

[0072] Vaporized gas of carbon dioxide generated in the cargo tanks (CTa, CTb, CTc) is discharged from the cargo tanks and supplied to a reformer (100) for producing syngas. For this purpose, the exhaust pipeline (BL) extends from the carbon dioxide tank to the reformer.

[0073] The reformer (100) receives methane of LNG vaporized gas supplied along the gas supply pipeline (GL) from the fuel tank (FT), carbon dioxide supplied along the exhaust pipeline (BL) from the cargo tanks, and water to produce syngas including hydrogen and carbon monoxide through reforming gasification as follows.

[0074] 2CH4 + CO2 + H2O → 5H2 + 3CO

[0075] The syngas produced in the reformer is supplied to the FT processing unit (200), where the syngas is converted into liquid hydrocarbons (Gas to Liquid, GTL), such as diesel, naphtha, etc., through a Fischer Tropsch Synthesis Reaction in the presence of a catalyst such as cobalt (Co), iron (Fe), etc. The FT processing unit can produce liquid hydrocarbons including diesel required for the consumption location on the ship to supply the liquid hydrocarbons as fuel thereto.

[0076] 5H2 + 3CO → GTL fuel

[0077] In this embodiment, the main engine (ME) for ship propulsion can be supplied with LNG fuel from a fuel tank, and the consumption points (C), such as a power generation engine, an auxiliary boiler (Aux. Boiler), etc., can be supplied with liquid hydrocarbon fuel produced by a reformer and an FT processing unit.

[0078] The ship can be provided with a liquid supply line (LL) along which the LNG stored in the fuel tank (FT) is supplied to the outside of the fuel tank (FT), and an LNG supply pump (FP) provided to the fuel tank (FT) to transport the LNG to the liquid supply line. The liquid supply line is provided with an LNG booster pump (300) that pressurizes the LNG according to the fuel supply pressure of the main engine for propulsion, and a forced vaporizer (350) that heats the pressurized LNG according to the fuel supply temperature of the main engine and supplies the heated LNG to the main engine. Thus, the LNG can be supplied as fuel to the main engine from the fuel tank through pressurization and heating.

[0079] The methane boil-off gas generated from the LNG in the fuel tank is supplied to the reformer for producing syngas, and when the amount of the evaporation gas generated in the fuel tank is less than the amount of methane required by the reformer, the LNG transported by the LNG supply pump (FP) can be supplied to the reformer. For this purpose, the liquid supply line (FL) can branch upstream of the LNG booster pump (300) and is connected to the reformer along line (FL1) and to the LNG booster pump along line (FL2) respectively.

[0080] When the amount of carbon dioxide boil-off gas generated in the cargo hold is less than the amount of carbon dioxide required by the reformer, some of the liquefied carbon dioxide in the cargo hold can be supplied to the reformer.

[0081] Since hydrocarbon fuel is used in the main engine for propulsion, the power generation engine, and the boiler, the exhaust gas contains carbon dioxide. The carbon dioxide contained in the exhaust gas can be captured and supplied to the reformer, or can be captured and liquefied for storage in the cargo hold.

[0082] The ship can be further provided with a storage tank (not shown) for storing the remaining liquid hydrocarbons after being transported as fuel for on-board consumption.

[0083] According to Figure 4 The ship according to the fourth embodiment shown in

[0084] That is, the ship according to the third embodiment is configured to supply LNG from the fuel tank to the main engine while supplying liquid hydrocarbons to the power generation engine, boiler, etc., whereas the ship according to the fourth embodiment is configured to supply liquid hydrocarbons not only to the power generation engine and the boiler but also to the main engine as on-board consumption locations.

[0085] The liquid supply line (FL) extending from the fuel tank (FT) is connected only to the reformer (100) without any branches, and the LNG transported by the LNG supply pump (FP) is supplied to the reformer as fuel for producing syngas and liquid hydrocarbons.

[0086] The cargo hold is provided with a transfer pump (CP) configured to pump liquefied carbon dioxide, and the exhaust gas line (BL) is provided with an in-line mixer (150). The carbon dioxide evaporation gas generated in the plurality of cargo holds is first supplied to the reformer, and when the amount of the evaporation gas generated in the cargo hold is less than the amount of carbon dioxide required by the reformer, the liquefied carbon dioxide transported by the transfer pump can be mixed with the carbon dioxide evaporation gas in the in-line mixer and supplied to the reformer.

[0087] Thus, the systems according to the third and fourth embodiments can effectively process the carbon dioxide evaporation gas generated in the cargo hold without discharging carbon dioxide into the atmosphere, maintain the internal pressure of the cargo hold of the carbon dioxide carrier during liquefied carbon dioxide transportation, and can produce on-board fuel from carbon dioxide to supply fuel to on-board consumption locations, thereby reducing the cost for ship operation and carbon dioxide emissions during ship operation.

[0088] Although some embodiments have been described herein, it should be understood that these embodiments are presented by way of example only, and those skilled in the art can make various modifications, changes, alterations, and equivalent embodiments without departing from the spirit and scope of the present invention.

Claims

1. A ship, comprising: A cargo hold for storing liquefied gas transported as cargo of the ship; A reformer for supplying methane, carbon dioxide and water to produce syngas including hydrogen and carbon monoxide; An FT processing unit for supplying the syngas produced in the reformer and converting the syngas into liquid hydrocarbons; And An exhaust gas pipeline extending from the cargo hold to the reformer, Wherein the evaporation gas generated by the liquefied gas in the cargo hold is supplied to the reformer through the exhaust gas pipeline for the production of syngas.

2. The ship according to claim 1, wherein The ship is an LNG carrier, The liquefied gas in the cargo hold is LNG, The evaporation gas generated from the LNG in the cargo hold is discharged to the reformer through the exhaust gas pipeline, and The liquid hydrocarbons produced in the FT processing unit are supplied as fuel to the on-board consumption locations.

3. The ship according to claim 2, further comprising: A carbon dioxide tank for storing liquefied carbon dioxide; And A fuel supply pipeline extending from the carbon dioxide tank to the reformer and supplying the evaporation gas of carbon dioxide generated in the carbon dioxide tank to the reformer.

4. The ship according to claim 3, further comprising: A transfer pump provided to the carbon dioxide tank for pumping the liquefied carbon dioxide; And An in-line mixer provided to the fuel supply pipeline, Wherein, when the amount of the evaporation gas of carbon dioxide generated in the carbon dioxide tank is less than the amount of carbon dioxide required by the reformer, the liquefied carbon dioxide transported by the transfer pump is mixed with the evaporation gas of carbon dioxide in the in-line mixer and supplied to the reformer.

5. The ship according to claim 4, further comprising: A liquid supply pipeline, along which the LNG stored in the cargo hold is supplied to the outside of the cargo hold; And An LNG supply pump provided to the cargo hold and transporting the LNG to the liquid supply pipeline, Wherein, when the amount of the evaporation gas generated in the cargo hold is less than the amount of methane required by the reformer, the LNG transported by the LNG supply pump is supplied to the reformer.

6. The ship according to claim 5, further comprising: An LNG booster pump provided to the liquid supply pipeline and pressurizing the LNG according to the fuel supply pressure of the main propulsion engine; And A forced vaporizer for heating the LNG pressurized in the LNG booster pump according to the fuel supply temperature of the main engine and supplying the heated LNG to the main engine, Wherein the on-board consumption locations include a power generation engine and a boiler.

7. The ship according to claim 5, wherein the on-board consumption locations include a main propulsion engine, a power generation engine and a boiler.

8. The ship according to claim 1, further comprising: A fuel tank for storing LNG supplied as on-board fuel, Wherein the ship is a carbon dioxide carrier and the liquefied gas in the cargo hold is liquefied carbon dioxide.

9. The ship according to claim 8 further comprises: A gas supply pipeline extending from the fuel tank to the reformer and supplying the evaporation gas generated from the LNG in the fuel tank to the reformer.

10. The ship according to claim 9 further comprises: A liquid supply pipeline along which the LNG stored in the fuel tank is supplied to the outside of the fuel tank; and An LNG supply pump provided to the fuel tank and transporting the LNG to the liquid supply pipeline, wherein when the amount of the evaporation gas generated in the fuel tank is less than the amount of methane required by the reformer, the LNG transported by the LNG supply pump is supplied to the reformer.

11. The ship according to claim 10 further comprises: An LNG booster pump provided to the liquid supply pipeline and pressurizing the LNG according to the fuel supply pressure of the main propulsion engine; and A forced vaporizer heating the LNG pressurized in the LNG booster pump according to the fuel supply temperature of the main engine and supplying the heated LNG to the main engine, wherein the on-board consumption locations include a power generation engine and a boiler.

12. The ship according to claim 10 further comprises: A transfer pump provided to the cargo hold for pumping the liquefied carbon dioxide; and An in-line mixer provided to the exhaust pipeline, wherein when the amount of the evaporation gas of carbon dioxide generated in the cargo hold is less than the amount of carbon dioxide required by the reformer, the liquefied carbon dioxide transported by the transfer pump is mixed with the evaporation gas of carbon dioxide in the in-line mixer and supplied to the reformer, and the on-board consumption locations include the main propulsion engine, a power generation engine and a boiler.

13. The ship according to any one of claims 6, 7, 11 and 12, wherein the carbon dioxide contained in the exhaust gas generated in the main propulsion engine, the power generation engine and the boiler is captured and supplied to the reformer.

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