KR102209710B1 - Dual structure fuel cell box and fuel cell system using thereof - Google Patents

Abstract

The dual structure fuel cell box according to the present invention includes: a hot box for accommodating a fuel cell stack; And a space between the inner surface and the outer surface of the hot box from the outside through an inlet in which the hot box is accommodated in the inner space, and the inner surface and the outer surface of the hot box are spaced apart and communicated with the outside. The fuel cell includes a case for introducing air into a heat exchange space, wherein the introduced air exchanges heat with the hot box in the heat exchange space and communicates the air electrode of the fuel cell stack with the heat exchange space. It is supplied to the air electrode of the stack.

Description

Dual structure fuel cell box and fuel cell system using the same {DUAL STRUCTURE FUEL CELL BOX AND FUEL CELL SYSTEM USING THEREOF}

The present invention relates to a dual structure fuel cell box and a fuel cell system using the same.

A container in which a fuel cell stack of a high-temperature fuel cell is accommodated is called a hot box. The hot box operates at high temperatures, including stacks, burners and high temperature BOPs. The hot box is operated at a temperature between 200 and 1000 degrees Celsius, so even if insulation is performed, the case of the hot box has a very high temperature.

For the safety of the system as a whole, the temperature of the hot box must be maintained within the specified temperature range. Previously, to achieve this purpose, a method of reinforcing the case of a hot box with an insulating material was used.

The present invention has been devised to solve these problems, and provides a dual structure fuel cell box and a fuel cell system using the same.

A fuel cell box having a dual structure according to an embodiment of the present invention includes a hot box for accommodating a fuel cell stack; Heat exchange, which is a space between the inner surface and the outer surface of the hot box from the outside through an inlet in which the hot box is accommodated in the inner space, the inner surface and the outer surface of the hot box are spaced apart and communicated with the outside A case for introducing air into the space; From at least one of the inner side of the case and the outer side of the hot box to form a flow path for dividing the heat exchange space to bypass the introduced air and guide it in a predetermined direction, the one side of the A plurality of baffles protruding toward the other side facing; And an air injection pipe that is introduced from the outside and flows along a flow path formed by the baffle in the heat exchange space and supplies air that has exchanged heat with the hot box to the cathode of the fuel cell stack, wherein the inner space of the case, A hot box accommodation space formed to accommodate the hot box therein and including the heat exchange space; And an air injection space which is the remaining space excluding the hot box accommodation space and communicates with the air electrode by the air injection pipe, wherein the case divides the hot box accommodation space and the air injection space, and A through hole communicating the heat exchange space and the air injection space is formed so that the air heat-exchanged with the box can flow into the air injection space from the heat exchange space, and flows into the air injection space from the heat exchange space, and in the air injection space. And a partition wall through which the air injection pipe passes so as to supply flowing air to the cathode.

A fuel cell system according to an embodiment of the present invention includes: a fuel cell stack including an air electrode and a fuel electrode; A hot box accommodating the fuel cell stack therein; A case receiving the hot box inside, having an inner surface spaced apart from the outer surface of the hot box, and receiving air from the outside into a heat exchange space that is a space between the inner surface and the outer surface of the hot box; From at least one of the inner side of the case and the outer side of the hot box to form a flow path for dividing the heat exchange space to bypass the introduced air and guide it in a predetermined direction, the one side of the A plurality of baffles protruding toward the other side facing; And an air injection pipe that is introduced from the outside and flows along a flow path formed by the baffle in the heat exchange space, and supplies air that has exchanged heat with the hot box to the cathode of the fuel cell stack, and heated in the heat exchange space. A hot box accommodation space including an air injection part supplying at least a portion of air to the cathode, and the inner space of the case is formed to accommodate the hot box therein and includes the heat exchange space; And an air injection space which is the remaining space excluding the hot box accommodation space and communicates with the air electrode by the air injection pipe, wherein the case divides the hot box accommodation space and the air injection space, and A through hole communicating the heat exchange space and the air injection space is formed so that the air heat-exchanged with the box can flow into the air injection space from the heat exchange space, and flows into the air injection space from the heat exchange space, and in the air injection space. And a partition wall through which the air injection pipe passes so as to supply flowing air to the cathode.

Accordingly, the temperature of the hot box can achieve a thermal insulation effect by the case of the double structure, and meet the required appropriate temperature range.

The efficiency of the fuel cell system increases as the air introduced into the hot box through the dual structure case is preheated.

1 is a longitudinal sectional view of a dual-structure fuel cell box and fuel cell system according to an embodiment of the present invention.
2 is a perspective view showing a region surrounding a hot box of a dual structure fuel cell box according to an embodiment of the present invention.
3 is a view showing a coupling relationship between a baffle and a case of a dual structure fuel cell box according to an embodiment of the present invention.
4 is a view showing a baffle structure of a double structure fuel cell box according to another embodiment of the present invention.
5 is a conceptual diagram of a fuel cell system including a dual-structure fuel cell box according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs an understanding of the embodiment of the present invention, a detailed description thereof will be omitted.

In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a) and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled", "communicated" or "connected" to another component, the component may be directly connected or connected to that other component, but between each component It should be understood that another component may be “connected”, “coupled”, “communicated” or “connected”.

1 is a longitudinal cross-sectional view of a dual-structure fuel cell box 1 and a fuel cell system according to an embodiment of the present invention.

Referring to FIG. 1, a fuel cell box 1 of a dual structure according to an embodiment of the present invention includes a case 10 and a hot box 20. A fuel cell system is configured by further providing an air injection unit 30 inside the dual structure and further providing a fuel cell stack 22 in the hot box 20.

Case(10)

The case 10 is a container constituting the exterior of the fuel cell system, and accommodates the hot box 20 and the air injection unit 30 in the inner space. The case 10 may be made of a material having low thermal conductivity, and may be formed as a rectangular parallelepiped, but the shape and material are not limited thereto.

An inlet 11 in communication with the outside is formed on one side of the case 10. Air is introduced into the inner space of the case 10 from the outside through the inlet 11. In an exemplary embodiment of the present invention, the position where the inlet 11 is formed is shown as an upper side of the case 10, but the position is not limited thereto.

The inner space of the case 10 may be divided into two areas. One is a hotbox accommodation space 18 formed to accommodate the hotbox 20 therein, and the other is an air injection space 17 which is the remaining space excluding the hotbox accommodation space 18. The case 10 may further include a partition wall 15 to separate the hot box accommodation space 18 and the air injection space 17. The cold box 19 may be accommodated in the air injection space 17, and the air injection unit 30 may be accommodated in the cold box 19 again. The cold box 19 is a container including the components of a fuel cell operated at room temperature, such as the air inlet 30.

The partition wall 15 divides the hot box accommodation space 18 and the air injection space 17 and allows air to flow between the two spaces. Therefore, at least one through hole 16 communicating the hot box accommodation space 18 and the air injection space 17 may be formed in the partition wall 15.

In addition, the partition wall 15 is configured such that the air injection pipe 31 can be connected from the air injection space 17 to the hot box 20. Accordingly, the air injection pipe 31 may pass through the partition wall 15. The air injection space after heat exchange in the heat exchange space 12 through the air injection pipe 31 communicating with the air electrode 221 of the fuel cell stack 22 included in the hot box 20 and the air injection space 17 The air staying at (17) is introduced into the cathode (221). Air is introduced through the air inlet 34 of the air inlet 30, and the air inlet 30 delivers the air to the hot box 20 through the air inlet pipe 31. The air injection unit 30 may be divided into compartments as shown in FIG. 1. In addition, the air injection unit 30 may include a blower 32.

In one embodiment of the present invention, as the partition wall 15 is located under the hot box 20, it is configured to withstand the self-weight of the hot box 20, and the air injection pipe 31 is It is arranged to communicate with the lower side, but the arrangement is not limited thereto.

The inlet 11 is formed to communicate with the hot box receiving space 18 and the outside, and the air injection space 17 is not directly connected to the inlet 11. Accordingly, air introduced from the outside flows into the air injection space 17 through the hot box accommodation space 18 first.

Hot Box(20)

The hot box 20 is a container for accommodating the fuel cell stack 22, and in addition to the fuel cell stack 22, a burner (25 in Fig. 5), a preheater (23 in Fig. 5), and a reformer (Fig. 5 of 24) and the like may be further included. These components may be mounted on a plate and assembled, and the hot box 20 may be configured by casing. The thermal conductivity of the material constituting the cover forming the hot box 20 may be higher than the thermal conductivity of the material constituting the case 10.

The outer surface 21 of the hot box and the inner surface 14 of the case are disposed to be spaced apart from each other. Accordingly, a space is formed between the outer surface 21 of the hot box and the inner surface 14 of the case, which is referred to as a heat exchange space 12. That is, except for the space occupied by the hot box 20 in the hot box accommodation space 18, it becomes the heat exchange space 12.

Air introduced from the outside through the inlet 11 flows along the heat exchange space 12. As the introduced air flows in the heat exchange space 12, it meets the outer surface 21 of the hot box, thereby exchanging heat with the hot box 20. The heat-exchanged air moves to the air injection space 17 through the through hole 16 of the partition wall 15 and is delivered to the hot box 20 through the air injection pipe 31.

The air introduced into the heat exchange space 12 from the outside heat exchanges with the outer surface 21 of the hot box that generates heat, and moves to the air injection space 17 through the through hole 16 of the partition wall 15. The moved air is introduced into the air injection unit 30 accommodated in the air injection space 17 through the air injection port 34, and the air injection unit 30 re-heats the air through the air injection pipe 31 Pass it to (20). Air is delivered from the hot box 20 to the cathode 221 to generate power for the fuel cell stack 22. Since the preheated air is supplied from the heat exchange space 12 and the heat insulation effect is generated due to the air flowing through the heat exchange space 12, the fuel cell box 1 and the hot box 20 of the entire double structure are required at an appropriate temperature Can meet the range.

In such a dual structure of the fuel cell box, the entire case surrounding the entire fuel cell system may be configured as the case 10 according to the exemplary embodiment of the present invention, or an implementation of the present invention within the entire case of the fuel cell system. The case 10 as in the example may be formed and accommodated. When the entire case and the case 10 of the present invention are the same, various components constituting the fuel cell may be accommodated in the air injection space 17 in addition to the air injection unit 30 and the cold box 19.

A flow path through which air flowing through the heat exchange space 12 can exchange heat with the hot box 20 is formed so that the temperature of the outer surface 21 of the hot box 20 is located within an appropriate temperature range. The flow path may be formed differently depending on the desired air flow type. In order to form a flow path in the heat exchange space 12, baffles 41, 42, 43, 44, 45, 47 may be formed between the inner side 14 of the case and the outer side 21 of the hot box.

Baffle (41, 42, 43, 44, 45, 47)

2 is a perspective view showing a region surrounding the hot box 20 of the dual-structure fuel cell box 1 according to an embodiment of the present invention.

Referring to FIG. 2, a baffle 41, 42, 43 from at least one of the outer surface 21 of the hot box and the inner surface 14 of the case toward the other side facing one side. , 44, 45) are formed to protrude. These baffles 41, 42, 43, 44, and 45 may be formed in a plate shape parallel to the bottom surface of the case 10, as shown in FIG. 2. In addition, the baffle 47 may be formed to protrude upward from the upper surface 215 of the hot box, and may also protrude downward from the lower surface.

The baffles 41, 42, 43, 44, 45, 47 divide the heat exchange space 12 to form a flow path for guiding the introduced air to move in a predetermined direction. However, the baffle (41, 42, 43, 44, 45, 47) completely divides the heat exchange space (12) into a plurality of parts so that the introduced air passes through the baffles (41, 42, 43, 44, 45, 47). Don't let it flow. Baffles 41, 42, 43, 44, 45, 47 are formed so that the introduced air stays at an appropriate position for a desired appropriate time and exchanges heat with the hot box 20. In addition, since air must be supplied to the fuel cell stack 22 as a result, baffles 41, 42, 43, 44, 45, and 47 must be formed so that air can flow smoothly.

Further, the flow paths formed by the baffles 41, 42, 43, 44, 45, 47 do not form small openings or narrow slits. When such a narrow flow path is formed, a pressure rises or a channeling phenomenon occurs, so that air flows very quickly to the region, which is disadvantageous in flowing a fluid to perform appropriate heat exchange.

Therefore, the shape of the baffles 41, 42, 43, 44, 45, 47 is not formed so that a narrow flow path is formed. As can be seen from the drawing, the baffle 41 may protrude from a predetermined height of one outer surface 212 of the hot box and be coupled to the inner surface 14 of the case, and another baffle 43 It may protrude from an area of a predetermined width among a predetermined height of the side surface 211 and be coupled to the inner surface 14 of the case. In addition, another baffle 44 may protrude from a predetermined height of the other outer surface 211 of the hot box, but may be disposed to be spaced apart from the inner surface 14 of the case without being coupled to the inner surface 14 of the case. Another baffle 42 protrudes toward the inner side 14 of the case, but some areas are coupled to the inner side 14 of the case, and some areas are not coupled to the inner side 14 of the case, but the inner side of the case. It can be arranged to be spaced apart from (14).

The arrangement of the baffles 41, 42, 43, 44, 45, 47 is not made so as to divide the heat exchange space 12 into a plurality of areas that are completely blocked from each other. The case where the hot box 20 and the case 10 is formed of a rectangular parallelepiped including an upper surface 215, a lower surface, and four side surfaces 211, 212, 213, and 214 will be described as an example. As can be seen in the drawing, it is placed on any two sides (any two sides of 211, 212, 213, 214) of the hot box 20 among a plurality of baffles (41, 42, 43, 44, 45, 47) The baffles (41, 42, 43, 44, 45) that are disposed on the other two side surfaces (211, 212, 213, 214 except for the two sides) are baffles (41, 42, 43, 44, 45). ) And are arranged not to be continuous with each other. In other words, a plurality of baffles (41, 42, 43, 44, 45) extending in the transverse direction are provided in plurality on the four side surfaces (211, 212, 213, 214) of the hot box 20, respectively, The baffles 41, 42, 43, 44, 45 may be disposed to be spaced apart from each other in the longitudinal direction from the side. Looking at one side 212, it can be seen that the two baffles 41 and 42 are spaced apart from each other in the longitudinal direction. When observing the side surfaces 211, 212, 213, and 214 of two adjacent hot boxes at the same time, the baffles 41, 42 and 43 are not continuous from each other along the transverse direction from one side to the other. 44, 45) can be deployed. The baffles 41, 42, 43, 44, and 45 are arranged in a non-continuous manner, so that air may flow therebetween. Also, a plurality of baffles 47 may be formed on the upper surface 215, but may be disposed so as not to be continuous with the baffles 41, 42, 43, 44 and 45 on the other side.

The baffles 41, 42, 43, 44, 45, 47 may be coupled to the outer surface 21 of the case 10 through a coupling member 50 such as a piece or a bolt or by a method including welding. . 3 is a view showing a coupling relationship between a baffle 41 and a case 10 of a dual-structure fuel cell box 1 according to an embodiment of the present invention. The baffle 41 protrudes from the outer surface 212 of the hot box toward the inner surface 14 of the case, and its tip contacts the inner surface 14 of the case, but is fastened from the outer surface of the case 10. The baffle 41 and the case 10 are fixed through the member 50. As the baffle 41 and the case 10 are fixed in this way, the baffle 41 connects the case 10 and the hot box 20, so that the positions of the case 10 and the hot box 20 are maintained. There is no need for a separate support to fix. In one embodiment of the present invention, the baffle 41 protrudes from the outer surface 212 of the hot box to the inner surface 14 of the case and is coupled, but the present invention is not limited thereto. The baffles may protrude to the outer surface 212 of the hot box and be coupled to perform the same role, or the baffles may protrude toward each other from both sides and be coupled to each other.

In FIG. 3, another baffle 42 is also shown, and it can be seen that air may flow through a flow path formed between the baffle 42 because it does not contact the inner surface 14 of the case.

With respect to the shape of the baffles 41, 42, 43, 44, 45, 47, only plate-shaped baffles 41, 42, 43, 44, 45, 47 protruding in parallel in the transverse direction were described in one embodiment. According to another embodiment of the present invention, a'v' shaped baffle 46 is possible. 4 is a view showing a structure of a baffle 46 of a dual-structure fuel cell box 1 according to another embodiment of the present invention. In the baffle 46 of another embodiment whose longitudinal section is formed in a'v' shape, a change in the flow of air occurs around the baffle 46 to obtain a desired heat exchange characteristic. A plurality of'v'-shaped baffles 46 may be disposed in the heat exchange space 12. In the case of the'v'-type baffle 46, heat exchange occurs largely around the location where the baffle is installed, so it can be used in a portion where the temperature is partially high.

5 is a conceptual diagram of a fuel cell system including a fuel cell box 1 of a dual structure according to an embodiment of the present invention.

Referring to FIG. 5, a fuel cell system according to an embodiment of the present invention includes an air injection unit 30 and a hot box 20. Although the case 10 is not shown in FIG. 5, referring to FIG. 1, it can be seen that the hot box 20 and the air injection part 30 are accommodated in separate spaces.

The air injection unit 30 flows through the heat exchange space 12 to heat exchange and receives preheated air from the air injection space 17. The introduced air is introduced into the hot box 20 through an air injection pipe 31 through a filter 33 for removing foreign substances in the air and a blower 32 for blowing air toward the pipe.

The air injection pipe 31 is a pipe that supplies at least a portion of the air received from the air injection unit 30 to the cathode 221 of the fuel cell stack 22, and may include a preheater 23. The preheater 23 is a component that preheats air in the air injection pipe 31, and supplies the air to the fuel cell by receiving exhaust gas generated from the burner 25 through the exhaust gas pipes 251 and 252. Preheat to the right temperature. Since the air supplied to the cathode 221 of the fuel cell stack 22 must be maintained at a predetermined reaction temperature or higher, a preheater 23 is required. Since the air preheated in the heat exchange space 12 flows through the air injection pipe 31, the amount of heat to be transferred when the preheater 23 preheats the air decreases, thereby increasing the overall efficiency of the fuel cell. The exhaust gas passing through the preheater 23 is discharged to the outside of the hot box 20 through the exhaust gas discharge pipe 253.

The burner air injection pipe 254 is branched from the air injection pipe 31 and provides at least another part of the air delivered from the air injection unit 30 to the burner 25. The burner 25 is a component that receives fuel required for fuel operation, including LNG-type city gas, and mixes it with air to generate heat and exhaust gas through a combustion reaction. Therefore, by burning the air delivered from the burner air injection pipe 254, the gas obtained after the reaction of the cathode 221, and the exhaust gas introduced from the outside, the burner 25 generates heat, and as a result of the combustion reaction. The obtained exhaust gas is delivered to the reformer 24 through exhaust gas pipes 251 and 252. In order to transfer the gas obtained after the reaction of the cathode 221 to the burner 25, the fuel cell system may further include a cathode discharge pipe 224 communicating between the cathode 221 and the burner 25.

The exhaust gas pipes 251 and 252 primarily communicate the burner 25 and the reformer 24, and secondaryly communicate the reformer 24 and the preheater 23. Accordingly, the exhaust gas pipes 251 and 252 are the first exhaust gas pipe 251 connecting the reformer 24 and the burner 25, and the second exhaust gas pipe 252 connecting the reformer 24 and the preheater 23. ) Can be included. By sequentially supplying the exhaust gas generated by the burner 25 to the reformer 24 and the preheater 23, heat can be used for heating air or fuel.

The reformer 24 is a component that reforms fuel for supply of hydrogen. The reformer 24 receives hydrocarbons as fuel, and provides hydrogen to the fuel electrode 222 of the fuel cell stack 22 by decomposing it by reforming and decomposing it using heat in the exhaust gas of the burner 25. Accordingly, a fuel supply pipe 241 communicating the reformer 24 and the anode 222 may be disposed.

The fuel cell stack 22 includes a fuel electrode 222 and an air electrode 221, and includes an electrolyte membrane 223 connecting them, and is a component that receives fuel and air to generate electricity. As described above, as air is delivered to the cathode 221 through the air injection pipe 31, and hydrogen is supplied to the anode 222 from the reformed fuel through the reformer 24, the fuel cell stack 22 Produces power.

In the above, even if all the constituent elements constituting the embodiments of the present invention are described as being combined into one or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the constituent elements may be selectively combined and operated in one or more. In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components Rather, it should be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined, to which the present invention belongs. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1: dual structure fuel cell box 10: case
11: inlet 12: heat exchange space
14: inner side of the case 15: bulkhead
16: through hole 17: air injection space
18: hot box accommodation space 19: cold box
20: hot box 21: hot box outer surface
22: fuel cell stack 23: preheater
24: reformer 25: burner
30: air injection part 31: air injection pipe
32: blower 33: filter
34: air inlet
41, 42, 43, 44, 45, 46, 47: baffle
50: coupling member 211, 212, 213, 214: side
215: upper surface 221: air electrode
222: anode 223: electrolyte membrane
224: air electrode discharge pipe 241: fuel supply pipe
251, 252: exhaust gas pipe 253: exhaust gas discharge pipe
254: burner air injection pipe

Claims (13)

A hot box accommodating a fuel cell stack;
Heat exchange, which is a space between the inner surface and the outer surface of the hot box from the outside through an inlet in which the hot box is accommodated in the inner space, the inner surface and the outer surface of the hot box are spaced apart and communicated with the outside A case for introducing air into the space;
From at least one of the inner side of the case and the outer side of the hot box to form a flow path for dividing the heat exchange space to bypass the introduced air and guide it in a predetermined direction, the one side of the A plurality of baffles protruding toward the other side facing; And
An air injection pipe that is introduced from the outside and flows along a flow path formed by the baffle in the heat exchange space and supplies air that has exchanged heat with the hot box to the cathode of the fuel cell stack,
The inner space of the case,
A hot box accommodation space formed to accommodate the hot box therein and including the heat exchange space; And
The remaining space except for the hot box accommodation space, and includes an air injection space communicating with the air electrode by the air injection pipe,
The case divides the hot box accommodation space and the air injection space, and communicates the heat exchange space and the air injection space so that the air heat-exchanged with the hot box can flow into the air injection space from the heat exchange space. And a partition wall through which the air injection pipe passes so that air flowing from the heat exchange space into the air injection space and flowing in the air injection space can be supplied to the cathode.

delete The method of claim 1,
A front end of at least one baffle among the plurality of baffles is coupled to the other side surface to connect the case and the hot box. The method of claim 1,
The baffle is a double-structured fuel cell box having a plate shape parallel to the bottom surface of the case. The method of claim 1,
The longitudinal section of the baffle is formed in a'v' shape, a dual-structure fuel cell box. The method of claim 1,
The hot box and the case are composed of a rectangular parallelepiped,
The baffles disposed on any two side surfaces of the hot box among the plurality of baffles are not continuous with the baffles disposed on the other two side surfaces of the hot box. According to claim 1
The hot box and the case are formed in the shape of a rectangular parallelepiped including an upper surface, a lower surface and four side surfaces,
The plurality of baffles,
Each extends transversely,
Each of the four sides of the hot box is provided in a plurality,
On any one side, they are arranged to be spaced apart from each other in the longitudinal direction,
In two adjacent side surfaces, the fuel cell box having a dual structure, which is disposed not consecutively to each other along the transverse direction from one side to the other side. The method of claim 1,
The material constituting the case is a material having a lower thermal conductivity than the material constituting the hot box. delete A fuel cell stack including an air electrode and a fuel electrode;
A hot box accommodating the fuel cell stack therein;
A case receiving the hot box inside, having an inner surface spaced apart from the outer surface of the hot box, and receiving air from the outside into a heat exchange space that is a space between the inner surface and the outer surface of the hot box;
From at least one of the inner side of the case and the outer side of the hot box to form a flow path for dividing the heat exchange space to bypass the introduced air and guide it in a predetermined direction, the one side of the A plurality of baffles protruding toward the other side facing; And
Air heated in the heat exchange space, including an air injection pipe that is introduced from the outside and flows along a flow path formed by the baffles in the heat exchange space, and supplies the air heat-exchanged with the hot box to the cathode of the fuel cell stack. Includes an air injection part for supplying at least a portion of the air electrode,
The inner space of the case,
A hot box accommodation space formed to accommodate the hot box therein and including the heat exchange space; And
The remaining space except for the hot box accommodation space, and includes an air injection space communicating with the air electrode by the air injection pipe,
The case divides the hot box accommodation space and the air injection space, and communicates the heat exchange space and the air injection space so that the air heat-exchanged with the hot box can flow into the air injection space from the heat exchange space. And a partition wall through which the air injection pipe passes so that air flowing in the air injection space from the heat exchange space and flowing in the air injection space can be supplied to the cathode.
The method of claim 10,
A burner generating exhaust gas by combustion;
A preheater for receiving the exhaust gas from the burner and preheating the air in the air injection pipe through heat exchange; And
The fuel cell system further comprising a burner air injection pipe communicating with the air injection pipe and the burner to supply at least another part of heated air in the heat exchange space to the burner. The method of claim 11,
In order to supply hydrogen to the anode, the fuel cell system further comprises a reformer for reforming the supplied fuel, receiving the exhaust gas from the burner and using heat in the exhaust gas for a reforming reaction. The method of claim 12,
The fuel cell further comprises an exhaust gas pipe that primarily communicates with the burner and the reformer, and secondaryly communicates with the reformer and the preheater to sequentially supply exhaust gas generated by the burner to the reformer and the preheater. system.

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