KR102501945B1 - Apparatus for reforming fuel with excellent heat exchange efficiency and fuel cell system using the same - Google Patents

Abstract

The present invention relates to a fuel reformer with excellent heat exchange effect and a fuel cell system capable of reusing an anode off gas (AOG) using the same.
The fuel reforming apparatus according to the present invention includes a reforming unit, a burner unit, a heat exchange unit, and an exhaust gas discharge line, and the exhaust gas discharge line includes two discharge pipes having different diameters. At this time, when combustion gas including AOG is supplied to the burner unit, exhaust gas is discharged through a discharge pipe having a small diameter among two discharge pipes. Through this, when combustion gas including AOG is supplied to the burner unit, gas hourly space velocity (GHSV) in the heat exchange unit connected to the exhaust gas discharge line may be lowered, thereby increasing the heat exchange effect.

Description

Fuel reforming device with excellent heat exchange efficiency and fuel cell system using the same {Apparatus for reforming fuel with excellent heat exchange efficiency and fuel cell system using the same}

The present invention relates to a fuel reformer with excellent heat exchange efficiency.

In addition, the present invention relates to a fuel cell system capable of reusing AOG (Anode Off Gas).

A fuel cell system is a system that converts chemical energy of a fuel into electrical energy by an electrochemical reaction.

A fuel cell system includes a fuel reformer and a cell stack. The fuel reformer is a device that reforms hydrocarbon-based fuel into hydrogen to supply hydrogen to the cell stack. The cell stack generates electricity through an electrochemical reaction between hydrogen and oxygen supplied from a fuel reformer.

1 schematically shows a general fuel cell system.

Referring to FIG. 1 , the fuel cell system includes reformers 110 and 120 and a fuel cell 130 .

The reformers 110 and 120 are devices that supply hydrogen to the anode 131 of the fuel cell 130 . The reformer may include a high-temperature steam reforming unit 111 and CO removal units 112 and 120. The CO removal section includes at least one of an aqueous transition section 112 and a selective oxidation section 120 . 1 shows an example in which the high-temperature steam reforming unit 111 and the aqueous transition unit 112 are combined and the selective oxidation reaction unit 120 is separately disposed. Also, in FIG. 1 , a reformed gas discharge line 141 and a reformed gas discharge line 143 for removing carbon monoxide are shown. The reformed gas discharge line 141 has an inlet connected to the outlet of the aqueous transition unit 112 and an outlet connected to the inlet of the selective oxidation reaction unit 120 . The carbon monoxide removal reformed gas discharge line 143 has an inlet connected to the outlet of the selective oxidation reaction unit 120 and an outlet connected to the anode 131 of the fuel cell 130 .

The reforming unit 111 is connected to the reforming gas supply line 102 through which the reforming gas is supplied. The reforming gas may be a hydrocarbon gas such as LNG or LPG. The reforming unit 111 reforms the reforming gas into hydrogen. The reforming reaction in the reforming unit 111 is a chemical reaction between hydrocarbon-based fuel and water vapor. At this time, although the reformed gas, which is a result of the reforming reaction, is hydrogen, carbon monoxide (CO) is inevitably also generated. The CO removal units 112 and 120 serve to remove carbon monoxide from the reformed gas resulting from the reforming reaction of the reforming unit 111 . When the CO removal unit is the aqueous transition unit 112, carbon monoxide and water vapor chemically react to reduce the CO concentration. When the CO removal unit is the selective oxidation reaction unit 120, carbon monoxide and oxygen are chemically reacted to reduce the CO concentration.

Chemical reactions in the high-temperature steam reforming unit 111 and the CO removal units 112 and 120 are performed at a predetermined reaction temperature. This reaction temperature is determined according to the type of catalyst. This reaction temperature is obtained by exhaust gas generated by combustion of the combustion gas in a burner unit (not shown). The burner unit is connected to the combustion gas supply line 101 through which combustion gas is supplied. Exhaust gas generated from the burner unit exchanges heat with the reforming unit 110 while moving through the heat exchange unit 113 disposed around the reforming unit 110 .

Figure 2 shows the optimum temperature and the actual reaction temperature of the hot steam reforming section and the aqueous transition section.

In FIG. 2, the SR reactor refers to a high-temperature steam reforming unit, and the WGS reactor refers to an aqueous transition unit.

Referring to FIG. 2 , an actual reaction temperature may approach an appropriate temperature through heat exchange between the exhaust gas and the high-temperature steam reforming unit and heat exchange between the exhaust gas and the aqueous transition unit.

The fuel cell 130 includes an anode 131, a cathode 132, and an electrolyte 133 disposed between the anode and cathode. Hydrogen supplied to the anode 131 from the reformer and oxygen contained in the air supplied to the cathode 132 undergo an electrochemical reaction to generate electricity.

At this time, some of the hydrogen supplied to the anode 131 does not react. Hydrogen that has not reacted at the anode 131 is discharged to the outside as it is. Hydrogen that is discharged without reacting at the anode is referred to as anode off gas (AOG). In addition to hydrogen, AOG also includes CO ₂ , N ₂ , and the like. Discharging AOG as it is brings about the problem of wasting hydrogen.

3 schematically illustrates a fuel cell system in which AOG is reused.

Referring to FIG. 3 , AOG discharged from the anode 131 is supplied to the combustion gas supply line 101 through the AOG supply line 210 . In this case, hydrocarbon gas, which is a gas for fuel, and AOG are supplied together to the burner unit. It is known that when AOG containing hydrogen along with hydrocarbon gas is supplied to the burner unit, there is an effect of increasing combustion efficiency.

However, AOG containing hydrogen has a fast combustion rate, and the volumetric flow rate compared to LNG is about 120%, which is very high, including carbon dioxide and nitrogen other than hydrogen. Therefore, the exhaust gas generated through the combined combustion of LNG and AOG has a higher Gas Hourly Space Velocity (GHSV) than the exhaust gas generated through the combustion of LNG alone. Therefore, sufficient heat exchange between the high-temperature steam reforming unit and the exhaust gas is not achieved due to the fast GHSV of the exhaust gas. In addition, as the exhaust gas does not sufficiently exchange heat with the high-temperature steam reforming unit, the temperature of the exhaust gas becomes high, and excessive heat exchange occurs in the aqueous transition unit.

Figure 4 shows the appropriate temperature and actual reaction temperature of the high-temperature steam reforming section and aqueous transition section when AOG is reused as combustion gas.

Referring to FIG. 4, in the case of the high-temperature steam reforming unit, heat exchange is not sufficiently performed, so the actual reaction temperature is lower than the proper temperature (650° C.). Conversely, in the case of the aqueous transition, the actual reaction temperature is higher than the optimum temperature (190° C.) due to excessive heat exchange. This phenomenon results in poor chemical reactions in the high-temperature steam reforming section and the aqueous transition section. Therefore, the reuse of AOG as combustion gas brings another problem in that reforming efficiency and CO removal efficiency are lowered.

An object of the present invention is to provide a fuel reformer with excellent heat exchange effect.

An object of the present invention is to provide a fuel cell system capable of reusing AOG (Anode Off Gas) and having excellent heat exchange effect.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the embodiments of the present invention. . It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

A fuel reforming apparatus according to the present invention for solving the above problems includes a reforming unit, a burner unit, a heat exchange unit, and an exhaust gas discharge line, and the exhaust gas discharge line includes two discharge pipes having different inner diameters. At this time, when combustion gas including AOG is supplied to the burner unit, exhaust gas is discharged through a discharge pipe having a relatively small inner diameter among two discharge pipes.

Through this, when combustion gas including AOG is supplied to the burner unit, Gas Hourly Space Velocity (GHSV) in the heat exchange unit connected to the exhaust gas discharge line may be lowered. Through this, it is possible to increase the heat exchange effect between the exhaust gas and the reforming unit.

In the fuel reforming apparatus according to the present invention, the flow of exhaust gas may be controlled by opening and closing the valve.

For example, a valve may be disposed in a discharge pipe having a relatively large inner diameter among the two discharge pipes. In this case, when combustion gas containing AOG is supplied to the burner unit, the valve is closed, and when combustion gas not containing AOG is supplied to the burner unit, the valve is opened ( open) state.

As another example, valves may be disposed in each of the two discharge pipes. In this case, when combustion gas including AOG is supplied to the burner unit, a valve disposed in a discharge pipe having a relatively small inner diameter is in an open state, and a valve disposed in a discharge pipe having a relatively large internal diameter is in a closed state. Conversely, when combustion gas not containing AOG is supplied to the burner unit, the valve disposed in the discharge pipe having a relatively large inner diameter is in an open state, and the valve disposed in the discharge pipe having a relatively large inner diameter is in an open or closed state. do.

The reforming unit may include a high-temperature steam reforming unit and a CO removal unit. In addition, the CO removal unit may include an aqueous transition unit and a selective oxidation reaction unit.

A fuel cell system according to the present invention for solving the above problems includes a reformer and a fuel cell. The reformer includes a burner unit, a reforming unit, and a heat exchange unit. The fuel cell includes an anode, an electrolyte and a cathode.

At this time, the inlet of the anode of the fuel cell is connected to the outlet of the reforming unit of the reformer, and the outlet is connected to the inlet of the burner unit through the AOG supply line. Exhaust gas generated in the burner unit and heat exchange completed is discharged through an exhaust gas discharge line including two discharge pipes having different inner diameters. At this time, when combustion gas including AOG is supplied to the burner unit, exhaust gas is discharged through a discharge pipe having a relatively small inner diameter among two discharge pipes.

The fuel reforming device according to the present invention and the fuel cell system using the same have a structure in which combustion gas including AOG can be supplied to a burner unit. Therefore, the combustion efficiency in the burner part can be improved.

In particular, in the fuel reformer and fuel cell system using the fuel reforming device according to the present invention, exhaust gas is discharged through a discharge pipe having a relatively small inner diameter when a combustion gas including AOG is supplied to the burner unit. Through this, it is possible to lower the GHSV in the heat exchange unit by increasing the pressure of the discharge pipe. As a result, since the heat exchange time between the exhaust gas generated from the burner unit and the reforming unit can be increased, the effect of heat exchange between the exhaust gas and the reforming unit can be increased.

1 schematically shows a general fuel cell system.
Figure 2 shows the optimum temperature and the actual reaction temperature of the hot steam reforming section and the aqueous transition section.
3 schematically illustrates a fuel cell system in which AOG is reused.
Figure 4 shows the appropriate temperature and actual reaction temperature of the high-temperature steam reforming section and aqueous transition section when AOG is reused as combustion gas.
5 schematically illustrates a fuel cell system according to an embodiment of the present invention.
6 schematically illustrates a fuel cell system according to another embodiment of the present invention.
7 schematically shows a fuel cell system according to another embodiment of the present invention.
8 schematically shows a fuel cell system according to another embodiment of the present invention.
9 schematically shows an example of a fuel reforming device applicable to the present invention.

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

5 schematically illustrates a fuel cell system according to an embodiment of the present invention.

Referring to FIG. 5 , the illustrated fuel cell system includes a fuel reforming device 110 and a fuel cell 130 .

The fuel reforming device 110 is a device that supplies hydrogen to the anode 131 of the fuel cell 130 . The fuel reforming device includes a high-temperature steam reforming unit 111 . Also, the fuel reformer may include CO removal units 112 and 120 . The CO removal unit may include one or more of an aqueous transition unit 112 and a selective oxidation reaction unit 120 . 5 shows an example in which the high-temperature steam reforming unit 111 and the aqueous transition unit 112 are combined and the selective oxidation reaction unit 120 is separately disposed. The structure of the reforming unit including the high-temperature steam reforming unit may be modified as desired, and any known reformer structure is applicable to the present invention.

In addition, in FIG. 5 , the reformed gas discharge line 141 and the carbon monoxide removal reformed gas discharge line 143 are shown. The reformed gas discharge line 141 has an inlet connected to the outlet of the aqueous transition unit 112 and an outlet connected to the inlet of the selective oxidation reaction unit 120 . The carbon monoxide removal reformed gas discharge line 143 has an inlet connected to the outlet of the selective oxidation reaction unit 120 and an outlet connected to the anode 131 of the fuel cell 130 .

The high-temperature steam reforming unit 111 is connected to the reforming gas supply line 102 through which the reforming gas is supplied. The reforming gas may be a hydrocarbon gas such as LNG or LPG. The high-temperature steam reforming unit 111 reforms the reforming gas into hydrogen. The reforming reaction in the high-temperature steam reforming unit 111 is a chemical reaction between hydrocarbon-based fuel and steam, and can be represented by the following reaction formula.

CH ₄ + H ₂ O → H ₂ + CO + CO ₂ + CH ₄ + H ₂ O

In the case of the above reaction equation, it is a reaction equation when a sufficiently large amount of hydrocarbon-based fuel and steam are introduced into the reformer, and the number of moles of each component is not considered.

At this time, as can be seen in the above reaction formula, as a result of the high-temperature reforming reaction, in addition to hydrogen, carbon monoxide (CO) is inevitably produced together. Carbon monoxide is a factor that impairs the efficiency or performance of fuel cells. Therefore, it is necessary to control the concentration of carbon monoxide included in the reformed gas to be as low as possible.

The CO removal units 112 and 120 serve to remove carbon monoxide from the reformed gas resulting from the reforming reaction of the reforming unit 111 .

When the CO removal unit is the aqueous transition unit 112, carbon monoxide and water vapor chemically react to reduce the CO concentration.

CO + H ₂ O → CO ₂ + H ₂

When the CO removal unit is the selective oxidation reaction unit 120, carbon monoxide and oxygen are chemically reacted to reduce the CO concentration.

2CO + O ₂ → 2CO ₂

A catalyst is included in the reforming unit 111 and the CO removal units 112 and 120, respectively. The catalyst (first catalyst) included in the high-temperature steam reforming unit (first reforming unit) 111 may be, for example, Ni. The catalyst (2-1st catalyst) included in the aqueous transition part (2-1 reforming part) 112 may be, for example, Cu-Zn or Fe-Cr. The catalyst (second-second catalyst) included in the selective oxidation reaction unit (second-second reforming unit) 120 may be, for example, Ru or Pt.

Chemical reactions in the reforming unit 111 and the CO removal units 112 and 120 are performed at a predetermined reaction temperature. This reaction temperature is determined according to the type of catalyst. In the reforming unit 111, for example, a chemical reaction between hydrocarbon gas for reforming and water vapor is performed at about 600 to 700° C. under a Ni catalyst. In the aqueous transition unit 112, a chemical reaction between carbon monoxide and water vapor is performed at about 180 to 400° C. under a Cu—Zn catalyst, for example. In the selective oxidation reaction unit 120, for example, a chemical reaction between carbon monoxide and oxygen is performed at about 120 to 150° C. under a Pt catalyst.

This reaction temperature is obtained by exhaust gas generated by combustion of the combustion gas in a burner unit (not shown). The burner unit is connected to the combustion gas supply line 101 through which combustion gas is supplied. Combustion gas may be a hydrocarbon gas such as LNG or LPG. Exhaust gas generated from the burner unit exchanges heat with the reforming unit 110 while moving through the heat exchange unit 113 arranged in a flow path around the reforming unit 110 .

The fuel cell 130 includes an anode 131, a cathode 132, and an electrolyte 133 disposed between the anode and the cathode to move ions. Electricity is generated through an electrochemical reaction between hydrogen supplied to the anode 131 from the fuel reformer and oxygen contained in air supplied to the cathode 132 . The fuel cell 130 shown in FIG. 5 is one cell structure. In practice, tens to hundreds of fuel cells 130 shown in FIG. 5 are arranged to form a stack. Since the structure of a fuel cell or stack is already known in many literatures, a detailed description thereof will be omitted.

In the case of the present invention, AOG discharged from the anode 131 is supplied to the combustion gas supply line 101 through the AOG supply line 210. To the burner unit, hydrocarbon gas and AOG, which are fuel gases, are supplied together. When AOG containing hydrogen along with hydrocarbon gas is supplied to the burner unit, there is an effect of increasing combustion efficiency. Of course, AOG is not continuously supplied, and may be supplied to the combustion gas supply line 101 intermittently.

As described above, AOG containing hydrogen has a high combustion rate and a volumetric flow rate of about 120% compared to LNG, including carbon dioxide and nitrogen other than hydrogen. Therefore, the exhaust gas generated through the mixed combustion of LNG and AOG has a higher GHSV than the exhaust gas generated through the combustion of LNG alone. In this case, sufficient heat exchange between the high-temperature steam reforming unit and the exhaust gas is not achieved due to the fast GHSV of the exhaust gas, so there is a need to solve this problem.

In the case of the present invention, as in the example shown in FIG. 5 , the second discharge pipe 520 is branched from the exhaust gas discharge line composed of the first discharge pipe 142 . In addition, a first valve 510 is disposed in the first discharge pipe 142 . The second discharge pipe 520 may branch from the first discharge pipe 142 at a front end of the first valve 510 and merge with the first discharge pipe 142 at a rear end of the first valve 510 .

At this time, the inner diameter of the second discharge pipe 520 is smaller than the inner diameter of the first discharge pipe 142 . And, when AOG is supplied to the combustion gas supply line 101, that is, when AOG is supplied together with the combustion gas to the burner unit, the exhaust gas is discharged through the second discharge pipe 520 having a relatively small inner diameter. To this end, when AOG is supplied to the combustion gas supply line 101, the first valve 510 is in a closed state. When the inner diameter of the second discharge pipe becomes smaller, the pressure of the second discharge pipe increases, which can contribute to lowering the GHSV of the exhaust gas. When the GHSV of the exhaust gas is lowered, the heat exchange time between the exhaust gas and the reforming unit increases, and thus, a decrease in the actual reaction temperature of the high-temperature steam reforming unit can be prevented.

The inner diameter of the second discharge pipe 520 may be determined by considering the following Darcy-Weisbach equation.

(In the above formula, P is the pressure loss, L is the length of the second discharge pipe, D is the inner diameter of the second discharge pipe, ρ is the density of the exhaust gas, and V is the average flow rate of the exhaust gas)

Meanwhile, when AOG is not supplied to the combustion gas supply line, that is, when only reforming gas is supplied to the burner unit, the first valve is open. In this case, the exhaust gas may be discharged through the first discharge pipe 142 and the second discharge pipe 520 .

Also, as in the example shown in FIG. 5 , a third valve 530 may be disposed in the AOG supply line 210 . The amount of AOG supply may be adjusted according to the degree of opening of the third valve 530 .

6 schematically illustrates a fuel cell system according to another embodiment of the present invention.

The fuel cell system shown in FIG. 6 is similar to the fuel cell system shown in FIG. 5, but in that the second discharge pipe 520 is not joined to the first discharge pipe 142 at the rear end of the first valve 510. There is a difference from the fuel cell system shown in

The second discharge pipe 520 may be combined with the first discharge pipe 142 at the rear end of the first valve 510 as shown in FIG. 5 . Also, the second discharge pipe 520 may not be merged with the first discharge pipe 142 at the rear end of the first valve 510 as in the example shown in FIG. 6 .

7 and 8 schematically show a fuel cell system according to another embodiment of the present invention.

In the examples shown in FIGS. 7 and 8 , the first valve 510 is disposed in the first discharge pipe 142 and the second valve 521 is disposed in the second discharge pipe 520 .

When AOG is supplied to the combustion gas supply line 101, the first valve 510 is in a closed state and the second valve 521 is in an open state. Through this, when AOG is supplied to the combustion gas supply line 101, the exhaust gas is discharged through the second discharge pipe 520.

On the other hand, when AOG is not supplied to the combustion gas supply line 101, the first valve 510 is open. The second valve 521 can be in both an open state and a closed state. Through this, when AOG is not supplied to the combustion gas supply line 101, exhaust gas is discharged through the first discharge pipe 142 or exhaust gas is discharged through both the first discharge pipe 142 and the second discharge pipe 520. may be discharged.

9 schematically shows an example of a fuel reforming device applicable to the present invention.

Referring to FIG. 9 , the illustrated fuel reforming apparatus has a burner unit 610 and a high-temperature steam reforming unit 620 disposed at an upper portion, and an aqueous transition unit 630 disposed at a lower portion.

The position of each element of the fuel reforming device may be defined by a plurality of cylindrical bodies spaced apart from each other. The plurality of tubular bodies may have a concentric structure. For example, referring to FIG. 9 , the upper portion of the fuel reforming apparatus may include a total of four cylinders, namely, a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder. The burner unit 610 is disposed inside the first cylinder, the high-temperature steam reforming unit 620 is disposed between the second cylinder and the third cylinder, and the heat exchange unit is disposed in the space between the first cylinder and the second cylinder and in the third cylinder. It may be a space between the tubular body and the fourth tubular body.

However, the structure of the fuel reformer shown in FIG. 9 is only an example and other modifications are possible. For example, aqueous transition 630 may be disposed outside hot steam reforming 620 . As another example, a selective oxidation reaction unit may be disposed instead of the aqueous transition unit 630 .

The burner unit 610 is connected to the gas supply line 101 for combustion. The inlet 612 of the high-temperature steam reforming unit 620 is connected to the reforming gas supply line 102 . In FIG. 9 , reference numeral 615 denotes a flow of exhaust gas, and reference numeral 625 denotes a flow of reformed gas.

The reformed gas is discharged to the reformed gas discharge line through the outlet 641 of the aqueous transition part 630. The exhaust gas sequentially exchanges heat with the high-temperature steam reforming unit 620 and the aqueous transition unit 630, and then is discharged through the exhaust gas outlet 642 and the first discharge pipe 142 constituting the exhaust gas discharge line. .

As described above, when AOG is supplied to the burner unit 610 together with the reforming gas, the exhaust gas is discharged through a second discharge pipe having a small inner diameter branching from the first discharge pipe.

As described above, in the fuel reforming device and the fuel cell system using the fuel reforming device according to the present invention, when combustion gas including AOG is supplied to the burner unit, exhaust gas is discharged through an exhaust pipe having a relatively small inner diameter. Through this, it is possible to lower the GHSV in the heat exchange unit by increasing the pressure of the discharge pipe. As a result, since the heat exchange time between the exhaust gas generated from the burner unit and the reforming unit can be increased, the effect of heat exchange between the exhaust gas and the reforming unit can be increased.

The above-described present invention, since various substitutions, modifications, and changes are possible to those skilled in the art without departing from the technical spirit of the present invention, the above-described embodiments and accompanying drawings is not limited by

101: gas supply line for combustion 102: gas supply line for reforming
110: fuel reformer 111: high-temperature steam reformer
112: aqueous transition unit 113: heat exchange unit
120: selective oxidation reaction unit 130: fuel cell
131: anode 132: cathode
133: electrolyte 141: reformed gas discharge line
142: first discharge pipe
143: carbon monoxide removal reformed gas discharge line
210: AOG supply line 510: first valve
520: second discharge pipe 521: second valve
530: third valve 610: burner unit
620: high-temperature steam reforming unit 630: aqueous transition unit
612: inlet of high-temperature steam reforming unit 615: flow of exhaust gas
625: flow of reformed gas 641: outlet of aqueous transition
642: exhaust gas outlet

Claims (10)

a reformer having an inlet connected to a reforming gas supply line, an outlet connected to a reformed gas discharge line, and a catalyst disposed therein;
a burner unit having an inlet connected to a combustion gas supply line and having a burner;
a heat exchange unit arranged in a flow path around the reforming unit so that the exhaust gas supplied from the burner unit moves while exchanging heat with the reforming unit; and
An exhaust gas discharge line having an inlet connected to the heat exchange unit,
The exhaust gas discharge line includes a first discharge pipe and a second discharge pipe branching from the first discharge pipe and having a smaller inner diameter than the first discharge pipe,
A fuel reformer in which exhaust gas is discharged through the second discharge pipe when AOG (Anode Off Gas) is supplied to the combustion gas supply line.
According to claim 1,
A first valve is disposed in the first discharge pipe,
When AOG is supplied to the combustion gas supply line, the first valve is in a closed state,
The fuel reformer, wherein the first valve is in an open state when AOG is not supplied to the combustion gas supply line.
According to claim 1,
A first valve is disposed in the first discharge pipe, and a second valve is disposed in the second discharge pipe;
When AOG is supplied to the combustion gas supply line, the first valve is in a closed state and the second valve is in an open state,
When AOG is not supplied to the combustion gas supply line, the first valve is in an open state, and the second valve is in an open or closed state.
According to claim 1,
The reforming unit includes a first reforming unit in which a first catalyst for reacting the hydrocarbon-based gas supplied from the reforming gas supply line with water vapor is disposed, and carbon monoxide, water vapor, or oxygen among the reformed gases discharged from the first reforming unit. A fuel reforming device comprising a second reforming unit in which a second catalyst to react with the second reforming unit is disposed.
According to claim 4,
The second reforming part
A 2-1 reforming unit in which a 2-1 catalyst for reacting carbon monoxide and water vapor in reformed gas discharged from the first reforming unit is disposed;
A fuel reformer comprising a 2-2 reforming unit in which a 2-2 catalyst for selectively reacting carbon monoxide and oxygen among reformed gases discharged from the 2-1 reforming unit is disposed.
a reforming unit having an inlet connected to a reforming gas supply line and an outlet connected to a reformed gas discharge line and having a catalyst disposed therein; a burner unit having a burner and having an inlet connected to a combustion gas supply line; the burner unit a reformer including a heat exchanging unit disposed in a flow path around the reforming unit and having an outlet connected to an exhaust gas discharge line so that the exhaust gas supplied from the reforming unit moves while exchanging heat with the reforming unit; and
An inlet connected to the outlet of the reforming unit of the reformer, an anode to which the outlet is connected to the combustion gas supply line through an AOG supply line, a cathode to which air is supplied, and an electrolyte disposed between the anode and the cathode. including a fuel cell;
The exhaust gas discharge line includes a first discharge pipe and a second discharge pipe branching from the first discharge pipe and having a smaller inner diameter than the first discharge pipe, and when AOG is supplied to the combustion gas supply line, the second discharge pipe A fuel cell system through which exhaust gas is discharged.
According to claim 6,
Wherein the first discharge pipe is disposed with a valve closed when AOG is supplied to the combustion gas supply line.
According to claim 6,
When AOG is not supplied to the combustion gas supply line, exhaust gas is discharged through the first discharge pipe or exhaust gas is discharged through the first discharge pipe and the second discharge pipe.
According to claim 6,
A fuel cell system, wherein a valve is disposed in the AOG supply line.
According to claim 6,
The reforming unit includes a first reforming unit in which a first catalyst for reacting the hydrocarbon-based gas supplied from the reforming gas supply line with water vapor is disposed, and carbon monoxide, water vapor, or oxygen among the reformed gases discharged from the first reforming unit. A fuel cell system comprising a second reformer in which a second catalyst to react with is disposed.

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