KR101259459B1 - Fuel cell system and ship having the same - Google Patents

Abstract

A fuel cell system is disclosed. A fuel cell system according to an embodiment of the present invention includes a first fuel supply for generating fuel gas and heating air; A fuel cell stack that generates fuel gas and heats the air, and a fuel cell stack that receives electricity from the fuel gas and air generated from the first fuel supply and the second fuel supply, and generates electricity; The amount of fuel gas and air supplied to the cell stack is greater than the amount of fuel gas and air supplied from the second fuel supply to the fuel cell stack, and the fuel gas and air supplied by the second fuel supply to the fuel cell stack. The amount of is formed to be adjustable.

Description

Fuel cell system and ship having the same}

The present invention relates to a fuel cell system and a ship having the same.

The fuel cell includes a fuel supply (MBOP), a stack module, and a power converter (EBOP). The fuel supply (MBOP) supplies oxygen and hydrogen to the stack module of the fuel cell, and the oxygen, hydrogen, etc. supplied from the stack module generate electricity, water, and heat through a chemical reaction. The electricity generated is converted into alternating current in a power converter (EBOP).

The fuel cell is a polymer electrolyte and alkaline fuel cell operating at room temperature up to 100 ° C. or less, a phosphate fuel cell operating at around 150 ° C. to 200 ° C., operating at a high temperature of 600 to 700 ° C., depending on the type of electrolyte used. Molten carbonate fuel cells are classified as solid oxide fuel cells operating at high temperatures of 1,000 ° C or higher.

The fundamental principle of each of these fuel cells is the same, but the type of fuel, operating temperature, catalyst and electrolyte are different. Among these, molten carbonate fuel cells (MCFCs) are classified into an internal reformer type for producing hydrogen for reaction inside the stack and an external reformer type for producing hydrogen for reaction outside the stack.

In the internal reformer-type molten carbonate fuel cell, the fuel gas injected into the anode uses a hydrocarbon compound such as natural gas. Typically, a C2 or more hydrocarbon compound in the fuel gas is first used by using an initial reformer. The conversion to hydrogen maintains the hydrogen concentration of the entire fuel gas at 2% or more and is injected into the anode of the fuel cell stack together with water vapor, thereby promoting the steam reforming reaction occurring in the fuel cell stack.

On the other hand, high temperature fuel cells such as molten carbonate fuel cells control the temperature of the fuel cell stack in order to increase or decrease the load, but the temperature does not change quickly, which makes it difficult to control the load.

One embodiment of the present invention is to provide a fuel cell system capable of controlling a load while minimizing power consumption.

According to an aspect of the present invention, there is provided a fuel cell, comprising: a first fuel supply for generating fuel gas and heating air; A second fuel supply for generating fuel gas and heating air, and a fuel cell stack receiving the fuel gas and the air generated from the first fuel supply and the second fuel supply to generate electricity; Wherein the amount of fuel gas and air supplied from the first fuel supply to the fuel cell stack is greater than the amount of fuel gas and air supplied from the second fuel supply to the fuel cell stack, and the second fuel supply is The amount of the fuel gas and air supplied to the fuel cell stack can be provided to be adjustable to provide a fuel cell system.

At this time, the second fuel supply unit, a fuel processing unit for receiving the vaporized NG to generate the fuel gas; A fuel gas controller configured to receive the fuel gas from the fuel processor and adjust an amount of the fuel gas supplied to the fuel cell stack; A first heat supply unit which heats water to generate steam; A heat exchanger receiving the fuel gas from the fuel gas control unit and receiving the water vapor from the first heat supply unit to heat the fuel gas by heat-exchanging the fuel gas with the water vapor; And an air supply unit for sucking air and a catalytic combustor for receiving the air from the air supply unit and heating the air to supply the fuel cell stack.

On the other hand, the catalytic combustor may be heated by the combustion of a high-temperature exhaust gas supplied from the fuel cell stack.

On the other hand, the second fuel supply may further include a second heat supply for heating the air to supply to the catalytic burner.

At this time, the fuel processing unit desulfurizer for removing the sulfur component from the vaporized NG; The preliminary reformer for reforming the vaporized NG passing through the desulfurizer and the reformed gas is supplied and the vaporized NG is supplied from the desulfurizer and the reformed gas is supplied from the preliminary reformer to mix the vaporized NG and the reformed gas. It may include a mixing unit for supplying the fuel gas.

The fuel gas control unit may include a valve for recirculating a portion of the fuel gas supplied from the fuel processing unit, and an ejector for supplying the fuel gas to the fuel processing unit by receiving the fuel gas from the valve.

Meanwhile, the valve and the ejector may be mechanical.

At this time, the fuel gas control unit, a pump for controlling the supply amount of the fuel gas and a movement path control unit is installed on one side of the pump to change the movement path of the fuel gas, by using the pump of the fuel gas Increasing the supply amount may increase the load of the second fuel supply.

At this time, the movement path control unit may be any one of a blocking film or a valve.

According to another aspect of the present invention, a LNG storage tank and a fuel cell system for storing LNG, the second fuel supply and the first fuel supply is supplied with the NG or LNG vaporized from the LNG storage tank receives fuel gas LNG vessels characterized in that the supply can be provided.

In the fuel cell system according to an embodiment of the present invention, when the first fuel supply unit is operated in a steady state without a load change, the second fuel supply unit loads the load required by the fuel cell system according to the embodiment of the present invention. Can be increased or decreased.

In addition, the fuel cell system according to an embodiment of the present invention can control the load while minimizing the power consumption by using mechanical devices.

1 is a schematic configuration diagram of a fuel cell system according to a first embodiment of the present invention.
2 is a schematic configuration diagram of a first fuel supply unit of a fuel cell system according to a first embodiment of the present invention.
3 is a schematic configuration diagram of a second fuel supply unit of a fuel cell system according to a first embodiment of the present invention.
4 is a schematic configuration diagram of a second fuel supply unit of a fuel cell system according to a second embodiment of the present invention.
5 is a view illustrating that fuel gas passes through a pipe by closing an inlet of a passage of a pump among components of a second fuel supplier of a fuel cell system according to a second exemplary embodiment of the present invention.
FIG. 6 is a view illustrating an opening of an inlet of a passage of a pump among components of a second fuel supplier of a fuel cell system according to a second exemplary embodiment of the present invention, such that fuel gas passes through the pump.
7 is a schematic configuration diagram of an LNG ship according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations of embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a fuel cell system according to a first embodiment of the present invention. 2 is a schematic configuration diagram of a first fuel supply unit of a fuel cell system according to a first embodiment of the present invention. 3 is a schematic configuration diagram of a second fuel supply unit of a fuel cell system according to a first embodiment of the present invention.

The fuel cell includes a fuel supply (MBOP), a stack module, and a power converter (EBOP). The fuel supply unit (MBOP) supplies oxygen and hydrogen to the stack module in the fuel cell, and oxygen, hydrogen, etc. supplied from the stack module generate electricity, water, and heat through chemical reactions. The electricity generated is converted into alternating current in a power converter (EBOP).

Referring to FIG. 1, the fuel supply MBOP of the fuel cell system 10 according to the first embodiment of the present invention includes a first fuel supply 20 and a second fuel supply 30.

At this time, according to the present embodiment, the first fuel supply 20 may be a large capacity fuel supply, and the second fuel supply 30 may be a small capacity fuel supply. At this time, in the present embodiment, the large-capacity fuel supply means a predetermined capacity of the total supply amount of fuel gas (hereinafter referred to as fuel gas) including hydrogen supplied to the fuel cell stack and air (hereinafter referred to as air) including oxygen, For example, a fuel supply supplying a capacity of 50% or more but supplying the same capacity continuously, that is, in a steady state, and a small capacity fuel supply means a large fuel supply among the total supply of fuel gas and air supplied to the fuel cell stack. It is defined as a fuel supply means for supplying the fuel gas and air of the remaining capacity that is not supplied by the supply, but the amount of fuel gas and air supply is adjustable. For example, the first fuel supply 20 may supply more than 80% of fuel gas and air to the fuel cell stack in a normal state, and the second fuel supply may adjust the supply amount of fuel gas and air of 10-20% It can be supplied to the fuel cell stack. At this time, in this embodiment, the first fuel supply is "large capacity" and the second fuel supply is defined as "small capacity", meaning that the fuel supply amount of the first fuel supply is relatively greater than the fuel supply amount of the second fuel supply. In addition, the fuel supply amount of the first fuel supply and the fuel supply amount of the second fuel supply may vary depending on the amount of fuel supplied to the fuel cell and the amount of fuel to be adjusted.

The first fuel supplier 20 receives NG or LNG, water, and air from the outside, generates fuel gas, heats the air, and supplies a large amount of fuel gas and air to the fuel cell stack 900. The first fuel supplier 20 supplies fuel gas and air to the fuel cell stack 900 without load change.

On the other hand, the second fuel supplier 30 receives NG or LNG, water and air from the outside to generate fuel gas and heat the air to supply a small amount of fuel gas and air to the fuel cell stack 900. When the first fuel supply 20 is operated in a steady state without load fluctuation, the second fuel supply is required by the fuel cell system according to the first embodiment of the present invention while minimizing power consumption using mechanical devices. Load control is possible.

For example, when it is necessary to lower or increase the load of the fuel cell system according to the first embodiment of the present invention when the first fuel supply is operating in a steady state, the second fuel supply 30 may be used. The load of the fuel cell system according to the first embodiment can be reduced or increased.

On the other hand, the fuel cell stack 900 is supplied with fuel gas and air to produce electricity.

In this case, the fuel cell stack 900 may include an anode including a cathode gas outlet and an anode gas inlet, and an anode including the cathode gas outlet and an anode gas inlet.

In this case, the fuel cell stack 900 discharges the fuel gas introduced through the anode gas inlet to the anode gas outlet. The fuel gas may include a fuel gas in which the electrochemical reaction is performed and an unreacted fuel gas in which the electrochemical reaction is not performed.

In addition, the fuel cell stack 900 discharges air introduced through the cathode gas inlet to the cathode gas outlet. In this case, the air may include air in which the electrochemical reaction is performed and unreacted air in which the electrochemical reaction is not performed.

Next, the first fuel supply 20 of the fuel cell system 10 according to the first embodiment of the present invention will be described.

2, the first fuel supply unit 20 of the fuel cell system 10 according to the first embodiment of the present invention is the fuel processor 400, the heat exchanger 600, the first heat supply unit 300, It may include an air supply unit 200, the second heat supply unit 700 and the catalytic burner (800).

The fuel processor 400 receives the vaporized NG to generate fuel gas. The fuel processor 400 may include a desulfurizer 410, a preliminary reformer 420, and a mixing unit 430.

The desulfurizer 410 removes sulfur components from the vaporized NG.

The preliminary reformer 420 reforms the NG passing through the desulfurizer 410 to generate a reformed gas.

The mixing unit 430 receives the NG from which the sulfur component is removed from the desulfurization unit 410, receives the reformed gas from the preliminary reformer 420, and mixes the NG and the reformed gas to generate fuel gas.

On the other hand, the first heat supply unit 300 heats the water and supplies the water vapor generated through the heat exchanger 600. The first heat supply unit 300 changes the water into water vapor of about 100 degrees. The first heat supply unit 300 may heat water using, for example, a heater or a boiler.

On the other hand, the heat exchanger 600 receives the fuel gas mixed with the NG and the reforming gas from the fuel processing unit 400 and heat-exchanges the fuel gas heated by heat exchange with water vapor supplied from the first heat supply unit 300 to the fuel cell stack 900 Supplies). In addition, the heat exchanger 600 may receive water vapor from the first heat supply unit 300 to exchange heat with the fuel gas.

Meanwhile, the air supply unit 200 may suck air from the outside and supply the air to the second heat supply unit 700 at a constant pressure. In the fuel cell system according to the first embodiment of the present invention, the air supply unit 200 supplies air to the second heat supply unit 700, but the present invention is not limited thereto, and the air supply unit 200 directly supplies the air to the catalytic combustor 800. Can be supplied to Preferably, the air supply unit 200 may use a blower.

At this time, the air supply unit 200 may receive a high temperature exhaust gas from the fuel cell stack 900 and supply the air to the second heat supply unit 700 together with the air supplied from the outside. Since the high-temperature exhaust gas generated from the fuel cell stack 900 includes hydrogen and oxygen in an unreacted state, it may be supplied to the fuel cell stack 900 to improve the reaction efficiency.

Meanwhile, the second heat supply unit 700 primarily heats air and supplies the air to the catalytic combustion device. Preferably, the second heat supply unit 700 may use a heater.

Meanwhile, the catalytic combustor 800 receives air from the second heat supply unit 700 and heats it to supply the fuel cell stack 900. At this time, the catalytic combustor 800 receives the high-temperature exhaust gas from the fuel cell stack 900 and burns it to heat the air. At this time, the high-temperature exhaust gas may include unreacted hydrogen, the catalyst burner 800 is a combustion reaction occurs in the catalytic burner (800) when a certain temperature or more is maintained to remove the hydrogen in the high-temperature exhaust gas. Can be.

Next, the second fuel supplier 30 of the fuel cell system 10 according to the first embodiment of the present invention will be described.

Referring to FIG. 3, the second fuel supplier 30 of the fuel cell system 10 according to the first embodiment of the present invention includes a fuel processor 400, a fuel gas controller 500, a heat exchanger 600, The first heat supply unit 300, the air supply unit 200, the second heat supply unit 700 and the catalyst burner 800 may be included.

The second fuel supplier 30 further includes a fuel gas control unit 500 in comparison with the first fuel supplier 20. Hereinafter, in the description of the second fuel supply, the same or similar configuration as that of the first fuel supply 20 will be omitted, and the configuration of the fuel gas control unit of the configuration of the second fuel supply will be described in more detail.

The fuel gas controller 500 receives the fuel gas from the fuel processor 400 to adjust the amount of fuel gas supplied to the fuel cell stack 900. According to an embodiment of the present invention, the fuel gas control unit 500 may include a valve 530 and an ejector 510.

The valve 530 recycles some of the fuel gas from the fuel gas supplied from the fuel processor 400 to the ejector 510.

The ejector ejector 510 receives water vapor from the heat exchanger 600, receives fuel gas from the fuel processor 400 through the valve 530, and supplies the fuel gas and water vapor to the preliminary reformer 420 by the pressure of the water vapor. Supply.

The ejector 510 injects fuel gas and water vapor at a constant pressure to the front of the preliminary reformer 420. Therefore, the injection pressure of the ejector 510 should not be changed by adjusting the amount of water vapor supplied from the heat exchanger 600 according to the amount of fuel gas delivered from the valve 530. That is, when the amount of fuel gas recycled through the valve 530 is large, the amount of water vapor supplied from the heat exchanger 600 is reduced, and when the amount of fuel gas recycled is small, the water vapor supplied from the heat exchanger 600 is reduced. Increase the amount of

In this embodiment, the fuel gas control unit is configured to include a valve and an ejector. However, the configuration of the fuel gas control unit is not limited thereto. It is also possible to comprise a configuration.

Next, a process of producing a current by adjusting the amount of fuel gas supplied to the fuel cell stack using the second fuel supply of the fuel cell system according to the first embodiment of the present invention will be described. Since the process of producing electricity by using the first fuel supply is similar to the process of producing electricity by using the second fuel supply, description thereof will be omitted.

1 and 3, first, vaporized NG is supplied from a desulfurizer to remove sulfur components. The sulfur-free NG is partly fed to the pre-reformer and the remainder to the mixing section. Thereafter, NG is supplied from a preliminary reformer to be reformed to produce a reformed gas including hydrogen. Next, the reforming gas and the NG from which the sulfur component is removed are supplied from the mixing unit, and mixed with each other to generate fuel gas.

Subsequently, the fuel gas is supplied from the valve 530 of the fuel gas control unit 500 to send a part of the fuel gas to the ejector 510 and supply the remaining fuel gas to the heat exchanger 600.

The fuel gas supplied to the ejector 510 is injected into the preliminary reformer by water vapor supplied from the heat exchanger 600 to the ejector 510 and recycled. At this time, the first heat supply unit heats water to supply water vapor to the heat exchanger.

The fuel gas supplied to the heat exchanger is heated by water vapor in the heat exchanger and supplied to the fuel cell stack.

Air is then supplied to the second heat supply at a constant pressure by the air supply. At this time, the air supply unit receives the exhaust gas from the fuel cell stack and supplies it with the air to the second heat supply unit. Thereafter, the second heat supply unit primarily heats air and exhaust gas. Next, the catalytic combustor heats exhaust gas and air and supplies it to the fuel cell stack.

As described above, in the fuel cell system according to the first embodiment of the present invention, when the first fuel supply is operated in a steady state without load variation, the second fuel supply is the fuel cell according to the first embodiment of the present invention. The load required by the system can be reduced.

On the other hand, the valve supplies a part of the fuel to the ejector, and the ejector recycles a portion of the fuel in front of the pre-reformer, the fuel cell system according to the first embodiment of the present invention controls the fuel gas supplied to the fuel cell stack The load can be reduced.

Accordingly, the amount of fuel supplied decreases, and the amount of the reduced amount is further reformed by supplying methane contained in the NG vaporized again through the preliminary reformer to hydrogen, thereby increasing the reaction efficiency of the chemical reaction for power generation inside the fuel cell stack. Can be.

On the other hand, the ejector and the valve of the fuel cell system according to the first embodiment of the present invention may be made of a mechanical system that can be simply manually adjusted as well as electronically controlled electrically complicated. As such, when the ejector and the valve are mechanical, power consumption may be reduced when compared to the case where the ejector and the valve are controlled electronically.

Next, a fuel cell system according to a second embodiment of the present invention will be described.

4 is a schematic configuration diagram of a second fuel supply unit of a fuel cell system according to a second embodiment of the present invention. 5 is a view illustrating that fuel gas passes through a pipe by closing an inlet of a passage of a pump among components of a second fuel supplier of a fuel cell system according to a second exemplary embodiment of the present invention. FIG. 6 is a view illustrating an opening of an inlet of a passage of a pump among components of a second fuel supplier of a fuel cell system according to a second exemplary embodiment of the present invention, such that fuel gas passes through the pump.

A configuration similar or identical to that of the fuel cell system according to the first embodiment of the fuel cell system according to the second embodiment of the present invention will not be described in detail.

The fuel cell system according to the second embodiment of the present invention may include a first fuel supply, a second fuel supply and a fuel cell stack similarly to the fuel cell system according to the first embodiment of the present invention. In this case, the fuel cell system according to the second embodiment may be configured to increase the reaction efficiency of a chemical reaction for power generation by increasing the amount of fuel gas supplied from the second fuel supply. Are distinguished. Hereinafter, the fuel cell system according to the second embodiment will be described in more detail.

Referring to FIG. 4, the second fuel supplier 30 ′ of the fuel cell system 10 according to the second embodiment of the present invention may include a fuel processor 400, a fuel gas controller 500 ′, and a heat exchanger 600. ), The first heat supply unit 300, the air supply unit 200, the second heat supply unit 700 and the catalytic burner 800.

Referring to FIG. 5, the fuel gas controller 500 ′ receives fuel gas from the fuel processor 400 and adjusts the amount of fuel gas supplied to the fuel cell stack 900. The fuel gas regulator 500 ′ may include a pump 520, a pipe 560, and a movement path controller. The fuel cell system according to the second exemplary embodiment of the present invention may use blocking films 540 and 550 as one embodiment of the movement path controller.

The pump 520 is installed at one side of the pipe 560 and receives a portion of the fuel gas from the fuel processor 400 to adjust the amount of fuel gas supplied to the first heat exchanger 600. As the operating speed of the pump 520 increases or decreases, the amount of fuel gas supplied to the first heat exchanger 600 also decreases.

5 and 6, passages on both sides of the pump 520 are coupled to the pipe 560 through which the fuel gas passes. In addition, flat plate-type blocking films 540 and 550 are installed at the inlets of the passages on both sides of the pump 520. One side of the blocking membranes 540 and 550 is provided to be opened and closed at one side of the inlet of the passage on both sides of the pump 520. For example, the blocking films 540 and 550 are rotatably installed to allow opening and closing of passages on both sides of the pump 520.

When the blocking membranes 540 and 550 rotate to block the inlets of the passages on both sides of the pump 520, as shown in FIG. 3, the fuel gas moves along the pipe 560. When the blocking films 540 and 550 rotate to open the inlets of the passages on both sides of the pump 520, as shown in FIG. 4, when the pump 520 is operated, the pump 520 on which the fuel gas is operated is opened. It is supplied to the heat exchanger 600 while the speed is increased.

That is, in the normal supply state, the inlet of the passages on both sides of the pump 520 is blocked to supply the fuel gas to the pipe 560. If it is desired to supply more fuel gas than the normal supply state, open the inlets of the passages on both sides of the pump 520 and simultaneously operate the pump 520 to supply more fuel gas to the heat exchanger 600 than the normal supply state. To be supplied.

The fuel cell system 10 according to the second embodiment of the present invention uses a blocking film 540.550 as a movement path control unit for controlling the movement of fuel gas, but a three-way valve or a bypass line having a valve formed in front is used. Can be. In the case of a three-way valve, one side of the two outlets may be connected to one side of the pump 520 to adjust the flow of fuel gas moving to the pump 520.

When using a bypass line formed with a valve in the front, it is possible to connect the bypass line connected to one side of the pump 520 to the existing pipe 560. A valve can be installed at the front of the bypass line to regulate the flow of fuel gas. At this time, a valve may be installed in front of the existing pipe 560.

On the other hand, the fuel cell system 10 according to the second embodiment of the present invention is provided with a pump 520 that can increase the flow rate of the fuel gas in the pipe 560 to supply additional flow gas fuel if necessary. Can be.

By doing so, in the fuel cell system according to the second embodiment of the present invention, when the first fuel supply is operated in a steady state without load fluctuation, the second fuel supply system is the fuel cell system according to the second embodiment of the present invention. You can increase the load you need.

The second fuel supply of the fuel cell system according to the first embodiment of the present invention reduces the load of the fuel cell system by recirculating a portion of the fuel supplied using the valve, but the fuel cell according to the second embodiment of the present invention. The second fuel supply of the system may increase the load of the fuel cell system using a boost pump.

In the fuel cell system according to an embodiment of the present invention, the fuel supply amount of the first fuel supply unit supplying a large amount of fuel gas is made constant, and a pump is installed in the second fuel supply unit 30 supplying a small amount of fuel gas. Increasing the supply of fuel gas, a smaller capacity, e.g. approximately 10, compared to the case of controlling the entire fuel supply to adjust the amount of fuel supplied when one fuel supply alone supplies fuel Since the total fuel supply amount is controlled only by controlling the fuel supply amount of the fuel supply having a load capacity of ˜20%, the amount of power consumption for increasing the supply amount of fuel gas in the fuel cell system can be reduced.

Next, an LNG vessel according to a third embodiment of the present invention will be described.

7 is a schematic configuration diagram of an LNG ship according to a third embodiment of the present invention.

Referring to FIG. 7, the LNG vessel 100 according to the third embodiment of the present invention includes the fuel cell systems according to the first and second embodiments described above, and includes one component of the fuel cell system, for example. The LNG storage tank 110 and the fuel cell system 10 according to the embodiments of the present invention may be included to supply LNG or LNG vaporized to the fuel processor.

The LNG vessel according to the third embodiment of the present invention is configured to supply NG or LNG generated from the LNG storage tank 110 installed in the LNG vessel to the second fuel supply and the first fuel supply. Accordingly, the fuel cell system installed in the ship according to the third embodiment of the present invention, without adding a device for supplying the vaporized NG, simply connected the pipe to the LNG storage tank 110 to efficiently vaporize Electricity can be produced by supplying NG or LNG.

In addition, the LNG ship equipped with the fuel cell system according to an embodiment of the present invention can be used by supplying the electricity generated from the fuel cell system to devices that require electricity supply in the LNG vessel.

As used herein, the term “ship” is not limited to meaning a structure that sails aquatic waters, but is used to include not only structures that sail aquatic waters, but also naval structures such as FLNG, which are floating and perform operations in aquatic waters. . The ship of the present embodiment may be, for example, LNGC or FLNG, but the present invention is not limited thereto.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art may implement the present invention in other specific forms without changing the technical spirit or essential features of the present invention. You will understand that. The embodiments described above are therefore to be considered in all respects as illustrative and not restrictive.

10: fuel cell system
30, 30 ': second fuel supply 20: first fuel supply
200: air supply unit 300: first heat supply unit
400: fuel processor 410: desulfurizer
420: preliminary reformer 430: mixing unit
500, 500 ': fuel gas control unit 510: ejector
520: pump 530: valve
540, 550: barrier 560: piping
600: heat exchanger 700: second heat supply unit
800: catalytic burner 900: fuel cell stack
100: LNG ship 110: LNG storage tank

Claims (10)

A first fuel supply for producing fuel gas and heating air;
A second fuel supply for generating fuel gas and heating air;
A fuel cell stack configured to generate electricity by receiving the fuel gas and the air generated from the first fuel supply and the second fuel supply,
The amount of fuel gas and air supplied from the first fuel supply to the fuel cell stack is greater than the amount of fuel gas and air supplied from the second fuel supply to the fuel cell stack,
The fuel cell system, characterized in that the amount of the fuel gas and air supplied by the second fuel supply to the fuel cell stack is adjustable.
The method of claim 1,
The second fuel supplier,
A fuel processor configured to receive the vaporized NG and generate the fuel gas;
A fuel gas controller configured to receive the fuel gas from the fuel processor and adjust an amount of the fuel gas supplied to the fuel cell stack;
A first heat supply unit which heats water to generate steam;
A heat exchanger receiving the fuel gas from the fuel gas control unit and receiving the water vapor from the first heat supply unit to heat the fuel gas by heat-exchanging the fuel gas with the water vapor;
An air supply unit for sucking air and
And a catalytic combustor configured to receive the air from the air supply unit and heat the air to supply the fuel cell stack.
The method of claim 2,
The catalytic burner,
A fuel cell system for heating the air by receiving a high temperature exhaust gas from the fuel cell stack to burn.
The method of claim 2,
The second fuel supplier,
And a second heat supply unit for heating the air and supplying the air to the catalytic combustor.
The method of claim 2,
The fuel processor,
A desulfurizer for removing sulfur from the vaporized NG;
A preliminary reformer for reforming the vaporized NG passing through the desulfurizer to generate a reformed gas;
And a mixing unit configured to generate the fuel gas by mixing the vaporized NG and the reformed gas by receiving the vaporized NG from the desulfurizer and receiving a reformed gas from the preliminary reformer.
6. The method according to any one of claims 2 to 5,
The fuel gas control unit,
A valve for recirculating a portion of the fuel gas supplied from the fuel processor;
And an ejector configured to receive the fuel gas from the valve and supply the fuel gas to the fuel processor.
The method according to claim 6,
And the valve and ejector are mechanical.
6. The method according to any one of claims 2 to 5,
The fuel gas control unit,
A pump for adjusting a supply amount of the fuel gas;
Is installed on one side of the pump and includes a movement path adjusting unit for changing the movement path of the fuel gas,
And increasing the amount of fuel gas supplied using the pump to increase the load of the second fuel supply.
The method of claim 8,
The movement path control unit is a fuel cell system, characterized in that any one of the membrane and valve.
An LNG vessel having an LNG storage tank for storing LNG,
A fuel cell system according to any one of claims 2 to 5,
LNG vessel, characterized in that the second fuel supply and the first fuel supply is supplied with NG or LNG vaporized from the LNG storage tank to generate fuel gas.

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