KR102367178B1 - boil-off gas treatment system of LNG fueled ship equipped with hybrid power generation system - Google Patents

Abstract

The present invention relates to a BOG treatment system for an LNG fueled ship equipped with a hybrid power generation system, and more specifically to the BOG treatment system for an LNG fueled ship equipped with a hybrid power generation system that generates power by supplying boil off gas (BOG) generated in a process of supplying LNG to an LNG fuel-powered ship to a solid oxide fuel cell, uses the generated power as power used inside the ship during bunkering, and is able to compress and store the BOG and use the BOG after the bunkering is completed when surplus BOG occurs.

Description

BOG treatment system of LNG fueled ship equipped with hybrid power generation system {boil-off gas treatment system of LNG fueled ship equipped with hybrid power generation system}

The present invention relates to a BOG treatment system for an LNG fueled ship equipped with a hybrid power generation system, and more particularly, to a solid oxide fuel cell by supplying vaporized gas (BOG) generated in the process of supplying LNG to an LNG fueled ship. A hybrid power generation system that can be used after bunkering is completed by compressing and storing the surplus BOG when bunkering is used. It relates to the BOG processing system of LNG fueled ships.

As the International Maritime Organization (IMO) has confirmed that it will implement environmental strengthening regulations to drastically lower the sulfur content of ship fuel oil from 3.5% to 0.5% from 2020, regulations on ship exhaust gas are being strengthened worldwide. The market demand for ships using LNG as fuel (hereafter, LNG-fueled ships) is very high. Accordingly, interest in LNG bunkering, which is the process of receiving LNG, the fuel for LNG fueled ships, has grown.

In this regard, the LNG fuel tank and LNG storage by appropriately treating the gas that may be generated in large amounts in the LNG fuel tank of transportation means such as land transportation vehicles and ships during the LNG bunkering process in a way that does not emit air that may cause environmental pollution. A technology for preventing an increase in the internal pressure of a tank and reducing the risk of gas explosion is essential. In order to treat the evaporated gas in this way, conventionally, a method of discharging BOG into the atmosphere or incineration has been used. Techniques that allow liquefaction treatment to be reused as fuel are attracting attention.

In Korean Patent Application Laid-Open No. 10-2016-0012296 'Gas bunkering line and gas bunkering system including the same', it includes an inner tube through which liquefied gas flows, and an outer tube through which a refrigerant flows while surrounding the outer side of the inner tube, , a gas bunkering line connecting the liquefied gas storage tank and the bunkering station and bunkering the liquefied gas to the liquefied gas storage tank; a refrigerant supply line connected to the outer tube and supplying the refrigerant; It is provided on the refrigerant supply line and characterized in that it includes a refrigerant supply device for supplying the refrigerant, thereby minimizing the generation of boil-off gas generated during bunkering.

Although the above technology has the effect of minimizing the amount of BOG generated during the bunkering process by forming a gas bunker line with a double pipe and flowing a refrigerant through the outer pipe, there is a limitation in that BOG that has already been generated and stored in the LNG fuel tank cannot be treated there is

Korean Patent Laid-Open Patent No. 10-2016-0012296 'Gas bunkering line and gas bunkering system including the same'

It is an object of the present invention to not re-send boil-off gas (BOG), which is excessively generated in an LNG fuel tank during operation of an LNG vessel or during LNG bunkering, to an LNG bunkering vessel, It aims to utilize self-generated power without power supply from land or bunkering ships during bunkering by treating it so that it can be directly supplied as fuel to the oxide fuel cell.

In addition, when BOG exceeding the amount of fuel required in the SOFC is generated, a compressor capable of compressing the gas is provided to compress and store the BOG and then utilize it as a fuel for a solid oxide fuel cell in the future.

In addition, the main purpose is to improve the safety of the entire system by regulating the internal pressure of the LNG fuel tank, which may occur during bunkering of LNG.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

In order to achieve the above object, in the BOG processing system of an LNG fuel-propelled ship equipped with a hybrid power generation system according to the present invention, the LNG fuel is provided inside the LNG fuel-propelled ship and stores LNG used as a fuel of the ship. A dual fuel engine for a vessel in which a tank and the fuel stored in the LNG fuel tank are delivered through a first pipe to produce electric power and power required for the vessel; and the fuel stored in the LNG fuel tank is branched from the first pipe A high-temperature solid oxide fuel cell (SOFC) that is transmitted through two pipes and supplies power required for a ship by generating power through an electrochemical reaction; and at the front end of the branching point of the first pipe and the second pipe A fuel supply system (FGSS) that is provided and supplies the fuel stored in the LNG fuel tank to at least one of the dual fuel engine for ships and the high-temperature solid oxide fuel cell; and one side is an upper side of the LNG fuel tank; connected, and the other end is connected to the tip of the high-temperature solid oxide fuel cell, and is disposed on the flow path so that boil-off gas (BOG) generated inside the LNG fuel tank and boil-off gas generated from the LNG fuel tank during bunkering are transferred. 1 BOG transfer pipe having a gas valve unit; includes.

In addition, the first pipe includes a second gas valve unit provided on a flow path connecting the fuel supply system and the dual fuel engine for ships to transport, block, and control the supply amount of fuel,

The second pipe has one side connected to the fuel supply system, the other side coupled to one side of the first gas valve unit, and is on the flow path to adjust the pressure of the gas supplied to the pressure level of the second pipe. A pressure control valve is further provided, and it is characterized in that it is provided to deliver fuel to the high-temperature solid oxide fuel cell.

In addition, in the BOG transfer pipe, a heat exchanger is provided on the flow path in front of the first gas valve unit so that the temperature of the boil-off gas can be increased to a temperature required by the high-temperature type solid oxide fuel cell and supplied. A third pipe is coupled to the high-temperature solid oxide fuel cell and the other end is connected to one side of the heat exchanger to supply the high-temperature exhaust gas discharged from the high-temperature solid oxide fuel cell as the heat medium of the heat exchanger. characterized.

In addition, the BOG transfer pipe is configured to compress and store the remaining BOG after the BOG passed through the heat exchanger is supplied in an amount required by the high-temperature solid oxide fuel cell during LNG bunkering, and if necessary, the solid oxide fuel cell Or it is characterized in that it comprises a compression storage unit on the flow path of the BOG transfer pipe so as to be supplied to the dual fuel engine for ships.

Finally, in the compression storage unit, a compressor is provided on a fourth pipe branched from the rear end of the heat exchanger, and a compression storage tank is provided to store the compressed boil-off gas, the rear end of the compression storage tank and the BOG A fifth pipe connecting the transfer pipe and a sixth pipe branched from the fifth pipe and connected to the front end of the dual fuel engine for ships, the boil-off gas compressed and stored when necessary is stored in the high-temperature solid oxide fuel cell or for the ship It is characterized in that it is supplied to a dual fuel engine.

According to the present invention, in order to maintain the pressure of the LNG fuel tank, there is an effect that it is not necessary to provide a facility for sending gas to an LNG bunkering vessel or land.

In addition, by considering a high-temperature fuel cell that can directly utilize boil-off gas as fuel, the amount of power required for system operation can be met by itself, and energy efficiency can be maximized by using the heat supplied from the high-temperature fuel cell as a heat source. can

In addition, it is possible to control the pressure inside the LNG fuel tank by using the BOG transfer pipe for discharging BOG during bunkering, and it is possible to reduce the need to control the conventional LNG bunkering speed.

1 is a basic configuration diagram showing a fuel supply flow of an LNG-fueled propulsion ship equipped with a hybrid power generation system according to the present invention.
2 is a schematic diagram illustrating a process for treating boil-off gas generated in an LNG fuel tank according to the present invention.
3 is a schematic diagram showing the configuration of a compression storage unit for processing an excess portion of boil-off gas generated during bunkering according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings will be described in detail for the implementation of the present invention. Irrespective of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a basic configuration diagram showing a fuel supply flow of an LNG-fueled propulsion ship equipped with a hybrid power generation system according to the present invention.

As shown in FIG. 1 , the LNG fuel-propelled ship 20 equipped with a hybrid power generation system has an LNG fuel tank 210 provided therein, a fuel supply system (FGSS) 240 , and a dual fuel engine for ships 220 . , a high-temperature solid oxide fuel cell (SOFC) 230 and a BOG transfer pipe 250 .

First, the LNG fuel tank 210 is provided inside the LNG fuel propulsion ship 20 , and is provided as a space for storing LNG, which is fuel supplied from the LNG bunkering ship 10 .

A plurality of the LNG fuel tanks 210 may be provided inside the LNG fuel-propelled ship 20 , and natural gas is liquefied at a cryogenic temperature in the LNG fuel tank 210 to the LNG fuel tank 210 . Liquefied natural gas (LNG) having a liquid state is stored therein.

For example, vacuum cooling or polyurethane cooling may be applied to the LNG fuel tank to minimize vaporization of LNG so that LNG can be maintained in a liquid state at -163° C. under atmospheric pressure conditions.

In addition, during the bunkering process in which LNG is supplied from the LNG bunkering vessel 10 or the LNG fuel propulsion vessel 20 is operated inside the LNG fuel tank 210, the LNG is vaporized inside the LNG fuel tank 210. BOG (Boil off gas) is generated.

On the other hand, during the bunkering process of receiving LNG supply from the LNG bunkering vessel 10 or the operation of the LNG fuel propulsion vessel 20, the boil-off gas (BOG) generated inside the LNG fuel tank 210 is mostly methane. It is constituted, and preferably exists under the condition of -120°C.

The transfer of the boil-off gas (BOG) will be described in detail with reference to FIG. 2 to be described later.

Next, the fuel stored in the LNG fuel tank 210 is double for ships along the first pipe 222 connected to the LNG fuel tank 210 by a fuel supply system (FGSS) 240 to be described later. Fuel is delivered to engine 220 .

The dual fuel engine for ships 220 is connected to the generator 225 to generate AC power and to the ship propulsion unit 224 for securing the propulsion of the ship and a propulsion engine for generating power. (220b) can be distinguished.

The first pipe 222 is provided on a flow path connecting the fuel supply system 240 and the generator engine 220a, and a second gas valve unit ( 221) is provided, and a third gas valve unit 223 is also provided at the front end of the propulsion engine 220b to transfer, block, and control the amount of fuel supplied.

In this case, it is preferable that the second gas valve unit 221 and the third gas valve unit 223 are separately provided to supply the fuel pressure required by each engine.

For example, the generator engine 220a may be provided as a Dual Fuel Diesel Engine (DFDE).

On the other hand, the propulsion engine 220b may be a low-speed two-stroke cycle engine such as ME-GI or X-DF, and the generated power is transmitted to the ship propulsion unit 224 through the shaft to drive the ship. The generator engine 220a generates electricity through the generator 225 and transmits it to the power supply circuit 234 to be used as power required in the ship.

For example, when the low-speed two-stroke cycle is utilized, the ship propulsion unit 224 may be axially connected to a propeller that directly drives a ship, and is indirectly connected to a motor driving the propeller to propel the LNG fuel. Of course, it may be provided in any configuration capable of driving the vessel 20 .

Next, the fuel stored in the LNG fuel tank 210 is transmitted through the second pipe 232 branched from the first pipe 222, and power is generated by an electrochemical reaction to supply power required for the vessel. A high-temperature solid oxide fuel cell (SOFC) 230 is provided.

That is, one side of the second pipe 232 is connected to the fuel supply system 240 and the other side is coupled to one side of a first gas valve unit (GVU) 251 to be described later, thereby supplying fuel to the high-temperature solid. It is provided so as to be delivered to the oxide fuel cell 230 side.

For example, as the fuel pressure required by the high-temperature solid oxide fuel cell 230 is supplied at 1 bar, the first gas valve unit 251 requires the high-temperature solid oxide fuel cell 230 to supply the fuel pressure. The pressure is precisely controlled by the pressure, and the third gas valve unit 223 supplies the fuel pressure required by the engine, and the pressure of the gas supplied from the fuel supply system is in the range of up to 300 bar,g. It is preferable to be provided so that it can be adjusted.

On the other hand, when repairing or replacing the dual fuel engine 220 for ships, the second gas valve unit and the third gas valve unit are cut off, and the LNG fuel is transferred from the fuel supply system 240 to the second pipe 232 . It is provided to be supplied to the inside of the high-temperature solid oxide fuel cell 230 after the pressure is reduced through the first gas valve unit 251 by moving along the .

The first pipe 222 and the second pipe 232 may have any configuration capable of transporting low-temperature LNG while minimizing the temperature change, and preferably, a double-structured heat-insulating pipe (not shown). It is preferable to be provided.

On the other hand, the high-temperature solid oxide fuel cell 230 is a device that directly converts natural gas supplied as fuel into electrical energy through a chemical reaction, and uses a solid ceramic (not shown) as an electrolyte at a high temperature of 700°C to 1000°C. is driven

In other words, the anode side of the high-temperature type solid oxide fuel cell 230 receives fuel gas, and the cathode side of the high-temperature type solid oxide fuel cell 230 receives at least oxygen-containing air to receive fuel gas and oxidizing gas. power is produced by the mutual electrochemical reaction of

The power generated by the chemical reaction is transmitted to be used as power required in the ship through the power supply circuit 234 .

In addition, the high-temperature solid oxide fuel cell 230 is a fuel cell that does not cause electrolyte loss or has to replenish the electrolyte, and since it discharges high-temperature gas after a chemical reaction, it is It is prepared to be used.

Next, at least one of the dual fuel engine 220 and the high-temperature solid oxide fuel cell 230 provided at the front end of the branching point of the first pipe 222 and the second pipe 232 . A fuel supply system (FGSS) 240 for supplying the fuel stored in the LNG fuel tank 210 to the above system is provided.

In general, the fuel supply system 240 may be provided with an LNG vaporizer (not shown), a valve (not shown) and a control system (not shown), and the technology for the fuel supply system 240 is already known. Since it is an existing technology, a detailed description thereof will be omitted.

On the other hand, the fuel supplied to the dual fuel engine 220 for ships and the high-temperature solid oxide fuel cell 230 must be a gaseous component, which is the second fuel supply branched from the rear end of the fuel supply system 240 that vaporizes LNG. It is transmitted through the first pipe 222 and the second pipe 232 .

Next, one side is connected to the upper side of the LNG fuel tank 210, and the other side is connected to the tip of the high-temperature solid oxide fuel cell 230, and the boil-off gas generated inside the LNG fuel tank and bunkering A BOG transfer pipe 250 having the first gas valve unit (GVU) 251 is provided on a flow path so that boil-off gas (BOG) generated from the LNG fuel tank 210 is transferred.

Meanwhile, during the bunkering process of receiving LNG supply from the LNG bunkering vessel 10 or when the LNG fuel propulsion vessel 20 operates, the boil-off gas generated inside the LNG fuel tank 210 passes through the BOG transfer pipe 250 . The pressure inside the LNG fuel tank 210 can be appropriately adjusted, and the safety problem of explosion due to high pressure can also be solved.

That is, the BOG transfer pipe 250 sends the boil-off gas generated in the LNG fuel tank 210 to the high-temperature solid oxide fuel cell 230 without passing through the fuel supply system 240 , the first gas valve. The pressure required by the high-temperature solid oxide fuel cell 230 is adjusted through the unit 251 and then connected to be supplied.

At this time, of course, the first gas valve unit 251 may be controlled manually or automatically by a controller (not shown).

In addition, the first gas valve unit 251 is provided to control the amount or speed of LNG or BOG supplied from the fuel supply system 240 and the LNG storage tank 210, and the high-temperature solid oxide fuel cell The supply to 230 can be controlled.

Next, FIG. 2 is a schematic diagram showing a process of treating boil-off gas generated in the LNG fuel tank according to the present invention.

As shown in FIG. 2 , the BOG transfer at the front end of the first gas valve unit 251 so that the temperature of the boil-off gas is increased to a temperature required by the high-temperature solid oxide fuel cell 230 and supplied. A heat exchanger 260 is provided on the pipe 250 flow path.

The temperature of the boil-off gas (BOG) generated in the LNG fuel tank 210 may be -120°C, and since the temperature of the fuel required by the high-temperature solid oxide fuel cell 230 is 25°C at room temperature, the heat exchange The group 260 may be provided with any heat exchanger capable of overcoming the two temperature differences.

Accordingly, the configuration of the heat exchanger 260 is added to increase the temperature of the low-temperature boil-off gas to provide stable supply.

On the other hand, in order to increase the temperature of the low-temperature BOG, a high-temperature heating medium is required in the heat exchanger 260, and in the present invention, the high-temperature exhaust gas discharged after a chemical reaction in the high-temperature solid oxide fuel cell 230 is is used as a heating medium of the heat exchanger 260 .

That is, one side is coupled to the high-temperature type solid oxide fuel cell 230 , and the other side is connected to one side of the heat exchanger 260 to heat exchange the high-temperature exhaust gas discharged from the high-temperature type solid oxide fuel cell 230 . A third pipe 262 is provided to supply the heating medium of the group 260 .

Accordingly, since the high-temperature exhaust gas discharged from the high-temperature solid oxide fuel cell 230 is utilized, there is an advantage in that additional power equipment such as a heat source supply device for heating the low-temperature BOG is not required.

The boil-off gas that has undergone the heat exchange process is heated to a temperature of about 25° C. required by the high-temperature solid oxide fuel cell 230 , and then is supplied through the gas valve unit 251 .

In addition, at the same time as the BOG treatment, in the fuel supply system 240 , a pressure control valve 233 is provided on the flow path to supply fuel at an appropriate pressure along the flow path of the second pipe 232 .

That is, one side of the pressure control valve 233 is connected to the fuel supply system 240 , and the other side is coupled to one side of the first gas valve unit 251 , and the pressure level of the second pipe 232 . It is provided to adjust the pressure of the gas supplied to the .

Next, FIG. 3 is a schematic diagram showing the configuration of a compression storage unit for processing an excess portion of boil-off gas generated during bunkering according to the present invention.

As shown in FIG. 3 , in the BOG transfer pipe 250 , during LNG bunkering, the boil-off gas that has passed through the heat exchanger 260 is supplied in an amount required by the high-temperature solid oxide fuel cell 230 , and The remaining boil-off gas is compressed and stored, and a compression storage unit 270 provided on the flow path of the BOG transfer pipe 250 so that it can be supplied to the solid oxide fuel cell 230 or the dual fuel engine 220 for ships when necessary. ) is included.

In other words, the boil-off gas that has passed through the heat exchanger 260 is consumed in an amount necessary for the chemical reaction in the high-temperature solid oxide fuel cell 230, and the additionally supplied boil-off gas is compressed and stored to complete bunkering. The rear end of the BOG transfer pipe 250 and the first gas valve unit 251 so that it can be re-supplied to the high-temperature solid oxide fuel cell 230 or supplied to the dual fuel engine 220 for ships at a time point, if necessary. A compression storage unit 270 is provided at the front end of the .

In the compression storage unit 270 , a compressor 274 is provided on a fourth pipe 272 branched from the rear end of the heat exchanger 260 , and the compressed boil-off gas is supplied to the rear end of the compressor 274 . A compression storage tank 276 is provided for storage, and a fifth pipe 278 connecting the rear end of the compression storage tank 276 and the BOG transfer pipe 250 and the fifth pipe 278 are branched from the A sixth pipe 279 connected to the front end of the dual fuel engine 220 for ships is provided, and if necessary, the compressed and stored BOG is transferred to the high-temperature solid oxide fuel cell 230 or the dual fuel engine 220 for ships. It is provided so that it can be supplied.

In other words, the compression storage unit 270 is provided between the rear end of the heat exchanger 260 provided in the BOG transfer pipe 250 and the front end of the gas valve unit 251 to store the excess boil-off gas. will be.

In addition, a fourth gas valve unit 271 is provided on the flow path of the fourth pipe 272 to transfer and block the boil-off gas flowing into the compression storage unit 270 at the front end of the compressor 274 . will be prepared

The fourth gas valve unit 271 may transfer the boil-off gas to the compression storage unit 270 when the boil-off gas required by the high-temperature solid oxide fuel cell 230 is supplied and excess boil-off gas is generated. It is preferable that the fourth pipe 272 is opened and closed so that the fourth gas valve unit 271 can also be opened and closed automatically manually or remotely.

Meanwhile, the first gas valve unit 251 may further include a controller (not shown) to calculate the amount of the boil-off gas required in the high-temperature solid oxide fuel cell 230 .

Meanwhile, the gas valve unit (GVU) 251 may control the fuel to be delivered to the high temperature solid oxide fuel cell (SOFC) 230 when fuel is normally supplied through the fuel supply system 240 . The amount of fuel required so that the boil-off gas (BOG) generated inside the LNG fuel tank 210 is transferred to the high-temperature solid oxide fuel cell (SOFC) 230 through the BOG transfer pipe 250 during bunkering. It plays the role of controlling so that it can be calculated and delivered.

In addition, a control unit (not shown) provided in the first gas valve unit 251 is interlocked with the fourth gas valve unit 271 to the high-temperature solid oxide fuel cell 230 or the dual fuel engine 220 for ships. ) can be provided to control the opening and closing of the valves of the first gas valve unit 251, the second gas valve unit 221, and the third gas valve unit 223 by calculating the amount of fuel required in Of course.

For example, during operation of the LNG fuel-propelled ship 20 or bunkering operation, the first gas valve unit 251 is supplied with fuel through the fuel supply system 240 to provide the high-temperature solid oxide fuel cell (SOFC). ) 230, the control unit (not shown) closes the fourth gas valve unit 271 when it is calculated as the amount of fuel that can be accommodated in the high-temperature solid oxide fuel cell 230, and closes the heat exchange It is possible to control so that the boil-off gas that has passed through the unit 260 is delivered and supplied only to the high-temperature solid oxide fuel cell 230 without going through the compression storage unit 270 .

Additionally, when the BOG that has passed through the heat exchanger 260 is supplied in an amount required by the high-temperature solid oxide fuel cell 230 or the dual fuel engine 220 for ships and the remaining surplus BOG is generated, the gas A control unit (not shown) provided in the valve unit 251 opens the second on/off valve 271 so that the boil-off gas can be transferred to the compression storage unit 270 so that the boil-off gas is transferred to the fourth pipe ( Control is also possible so that it can be transferred into the compressor 274 along the 272 .

Accordingly, the high-temperature solid oxide fuel cell 230 supplied with the LNG fuel or the boil-off gas through the above process is able to produce power required in the ship.

In particular, during bunkering, the BOG is supplied to the high-temperature solid oxide fuel cell 230 or the generator engine 220a to be provided to produce electric power, and it may be provided to generate electric power required in the ship through self-generated electric power. that can supply power.

Accordingly, while the LNG-fueled propulsion ship 20 is in operation, propulsion power and electric power can be produced through the dual fuel engine 220 for the ship, and the LNG-fueled propulsion ship 20 supplies fuel from the LNG bunkering ship. During the receiving bunkering operation, as the high-temperature solid oxide fuel cell 230 receives the boil-off gas and produces electricity, the fuel efficiency and energy efficiency of the LNG-fueled propulsion ship 20 equipped with a hybrid power generation system will also be increased. it can be

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: LNG bunkering vessel
20: LNG fueled ship
200: BOG processing system
210: LNG fuel tank
220: dual fuel engine for ships
220a: generator engine
220b: engine for propulsion
221: second gas valve unit
222: first pipe
223: third gas valve unit
224: ship propulsion department
225: generator
230: high-temperature solid oxide fuel cell (SOFC)
232: second pipe
233: pressure control valve
234: power supply circuit
240: fuel supply system (FGSS)
250: BOG transfer pipe
251: first gas valve unit (GVU)
260: heat exchanger
262: third pipe
270: compression storage unit
271: fourth gas valve unit
272: fourth pipe
274: compressor
276: compression storage tank
278: fifth pipe
279: sixth pipe

Claims (5)

In the BOG processing system of an LNG-fueled propulsion ship equipped with a hybrid power generation system,
an LNG fuel tank that is provided inside the LNG fuel-propelled ship and stores LNG used as a fuel for the ship;
a dual fuel engine for ships in which the fuel stored in the LNG fuel tank is delivered through a first pipe to produce electric power and power required for the ship;
a high-temperature solid oxide fuel cell (SOFC) in which the fuel stored in the LNG fuel tank is delivered through a second pipe branched from the first pipe, and generates power through an electrochemical reaction to supply power required for the vessel;
A fuel supply that is provided at the front end of the branching point of the first pipe and the second pipe, and supplies the fuel stored in the LNG fuel tank to at least one of the dual fuel engine for ships and the high-temperature solid oxide fuel cell. system (FGSS);
One side is connected to one side of the upper part of the LNG fuel tank, and the other side is connected to the tip of the high-temperature solid oxide fuel cell, and BOG generated inside the LNG fuel tank and generated in the LNG fuel tank during bunkering A BOG transfer pipe having a first gas valve unit on the flow path so that the boil-off gas is transferred;
The first pipe includes a second gas valve unit provided on a flow path connecting the fuel supply system and the dual fuel engine for ships to transport, block, and control the supply amount of fuel,
The second pipe has one side connected to the fuel supply system, the other side coupled to one side of the first gas valve unit, and is on the flow path to adjust the pressure of the gas supplied to the pressure level of the second pipe. A pressure control valve is further provided, and the BOG treatment system of an LNG fuel-propelled ship equipped with a hybrid power generation system, characterized in that it is provided to deliver fuel to the high-temperature solid oxide fuel cell side. delete According to claim 1,
The BOG transfer pipe,
A heat exchanger is provided on the flow path in front of the first gas valve unit so that the temperature of the boil-off gas is increased to a temperature required by the high-temperature solid oxide fuel cell and supplied;
A third pipe is provided so that one end is coupled to the high-temperature solid oxide fuel cell and the other end is connected to one side of the heat exchanger to supply the high-temperature exhaust gas discharged from the high-temperature solid oxide fuel cell as the heat medium of the heat exchanger. BOG processing system for LNG fuel-powered ships equipped with a hybrid power generation system, characterized in that 4. The method of claim 3,
The BOG transfer pipe,
During LNG bunkering, the boil-off gas that has passed through the heat exchanger is supplied in an amount required by the high-temperature solid oxide fuel cell, and the remaining boil-off gas is compressed and stored, if necessary, supplied to the solid oxide fuel cell or the dual fuel engine for ships. A BOG processing system for an LNG-fueled propulsion vessel equipped with a hybrid power generation system, characterized in that it includes a compression storage unit on the flow path of the BOG transfer pipe so as to be able to do so. 5. The method of claim 4,
The compression storage unit,
A compressor is provided on a fourth pipe branched from the rear end of the heat exchanger, a compression storage tank is provided to store the compressed BOG, and a fifth pipe connecting the rear end of the compression storage tank and the BOG transfer pipe and the boil-off gas that is compressed and stored when necessary along a sixth pipe branched from the fifth pipe and connected to the front end of the dual fuel engine for ships is supplied to the high-temperature solid oxide fuel cell or the dual fuel engine for ships. A BOG processing system for LNG-fueled ships equipped with a hybrid power generation system.

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