Reforming unit, fuel cell module, and fuel cell device

Abstract

To provide a reforming unit, a fuel cell module, and a fuel cell device that can suppress temperature unevenness of a cell stack.SOLUTION: A reforming unit 100 is arranged above and separated from a fuel cell stack 900, and comprises: a combustion section 400 that combusts an off-gas exhausted from the fuel cell stack 900; a reforming section 300 that is arranged above the combustion section 400 and reforms a mixed gas including a source gas to generate a reformed gas including hydrogen supplied to the fuel cell stack 900; and a housing 110 that accommodates the combustion section 400 and the reforming section 300. The fuel cell stack 900 and the housing 110 have same external dimensions in at least one of a width direction (y-axis direction) and a length direction (x-axis direction).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a reforming unit, a fuel cell module, and a fuel cell device. [Background technology]

[0002] A reforming unit for supplying reformed gas to a fuel cell generally comprises, as its main components, a combustion section that burns offgas from the fuel cell, and a reforming section that generates reformed gas from a mixture of raw material gas and water vapor. The reforming unit may further comprise a vaporization section that is connected to the reforming section and vaporizes water. The reforming unit is, for example, composed of a combustion section, a reforming section, and a vaporization section stacked in this order (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-91619 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, it has become known that the size and shape of the reformer unit affect the operating performance of the fuel cell, including power generation efficiency. One of the reasons for this is thought to be that, depending on the size and shape of the reformer unit, radiant heat from the reformer unit housing is transmitted unevenly to the cell stack of the fuel cell, causing temperature variations in the cell stack.

[0005] The present disclosure has been made in consideration of the above-mentioned problems of the conventional technology, and aims to provide a reforming unit, a fuel cell module, and a fuel cell device that can suppress temperature unevenness in the cell stack. [Means for solving the problem]

[0006] In order to solve the above problems, a reforming unit according to an embodiment of the present disclosure comprises: A reforming unit disposed above and spaced apart from the fuel cell stack, a combustion section that combusts off-gas discharged from the fuel cell stack; a reforming section disposed above the combustion section, which reforms a mixed gas containing a raw material gas to generate a reformed gas containing hydrogen to be supplied to the fuel cell stack; a housing that accommodates the combustion section and the reforming section, The fuel cell stack and the housing have the same outer dimension in at least one of the width direction and length direction.

[0007] A fuel cell module according to an embodiment of the present disclosure includes the reforming unit described above.

[0008] A fuel cell device according to an embodiment of the present disclosure includes the above-described fuel cell module. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a reforming unit, a fuel cell module, and a fuel cell device that can suppress temperature unevenness in a cell stack. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a fuel cell module including a reforming unit according to one embodiment. [Figure 2] FIG. 2 is a plan view of a reformer section and a combustor section used in a reforming unit according to one embodiment. [Figure 3] FIG. 3 is a plan view of a reforming section and a combustion section used in a reforming unit according to one embodiment. [Figure 4] FIG. 4 is a schematic diagram of a fuel cell module including a reforming unit according to one embodiment. [Figure 5] FIG. 5 is a plan view of a reformer section and a combustor section used in a reforming unit according to one embodiment. [Figure 6]FIG. 6 is a plan view of a reforming section used in a reforming unit according to one embodiment. [Figure 7] FIG. 7 is a plan view of a reforming section used in a reforming unit according to one embodiment. [Figure 8] FIG. 8 is a plan view of a reforming section used in a reforming unit according to one embodiment. [Figure 9] FIG. 9 is a schematic diagram of a fuel cell module including a reforming unit according to one embodiment. [Figure 10] FIG. 10 is a plan view of the reformer section and the combustor section used in the reformer unit according to one embodiment. [Figure 11] FIG. 11 is a schematic diagram of a fuel cell module including a reforming unit according to one embodiment. [Figure 12] FIG. 12 is a side view of the fuel cell module of FIG. [Figure 13] FIG. 13 is a plan view of the fuel cell module of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] (First embodiment) FIG. 1 is a schematic diagram of a fuel cell module 10 including a reforming unit 100 according to a first embodiment. The fuel cell module 10 is a module that constitutes a fuel cell device. The fuel cell module 10 can constitute a fuel cell device together with other devices (e.g., pumps and sensors) for operating the fuel cell module 10. In the example of FIG. 1, the fuel cell module 10 includes the reforming unit 100 and a fuel cell stack 900. However, the configuration of the fuel cell module 10 is not limited to this.

[0012] The reforming unit 100 includes a combustion section 400, a reforming section 300, and a housing 110. However, the components of the reforming unit 100 are not limited to these. In this embodiment, the reforming unit 100 further includes a vaporization section 200.

[0013] Here, as shown in FIG. 1, Cartesian coordinates corresponding to the orientation of the reforming unit 100 are set. The z-axis direction is the direction in which the combustion section 400 and the reforming section 300 are stacked in the reforming unit 100. The x-axis direction corresponds to the length direction of the combustion section 400, the reforming section 300, and the fuel cell stack 900. The y-axis direction corresponds to the width direction (in other words, the depth direction) of the combustion section 400, the reforming section 300, and the fuel cell stack 900. Hereinafter, the z-axis direction may be referred to as the vertical direction or the stacking direction. Upward refers to the positive direction of the z-axis. Downward refers to the negative direction of the z-axis. The x-axis direction may be referred to as the length direction. The y-axis direction may be referred to as the width direction. This Cartesian coordinate system will also be used as appropriate in FIG. 2 and subsequent drawings. Positional relationships may be explained using the axes or planes of this Cartesian coordinate system.

[0014] The combustion section 400 combusts the off-gas discharged from the fuel cell stack 900. The combustion section 400 is also called a burner. The off-gas is a gas containing hydrogen that did not react in the fuel cell stack 900. The off-gas discharged from the fuel cell stack 900 is supplied to the combustion section 400 through an off-gas supply path 440. The combustion section 400 includes an ignition device 610, such as an ignition heater, to ignite the off-gas.

[0015] The reforming unit 300 reforms a mixed gas containing a raw material gas to generate a reformed gas to be supplied to the fuel cell stack 900. The reforming unit 300 contains a reforming catalyst and reforms the mixed gas using the reforming catalyst to generate a reformed gas containing hydrogen. The raw material gas may be a gaseous fuel such as natural gas containing hydrocarbons or LPG (Liquid Petroleum Gas). In the example of FIG. 1, the mixed gas contains not only the raw material gas but also water vapor generated by vaporizing water in the vaporization unit 200. The mixed gas is supplied to the reforming unit 300 through a mixed gas conduit 230. The reformed gas is supplied to the fuel cell stack 900 through a reformed gas supply path 330. The reforming catalyst is not limited to a specific one, and a commonly known one can be used. The outer shape of the reforming unit 300 is not limited to a specific one, and may be, for example, circular, elliptical, rectangular, or the like.

[0016] Here, the position at which the mixed gas conduit 230 is connected to the reforming section 300 may be near the end of the upper surface of the reforming section 300. The mixed gas conduit 230 may extend without bending. By connecting the reforming section 300 and the mixed gas conduit 230 in this manner, the structure of the reforming unit 100 is simplified, and it is possible to simplify the manufacturing process and reduce manufacturing costs.

[0017] The housing 110 accommodates the combustion section 400 and the reforming section 300. In the example of Fig. 1, the reforming section 300 is disposed above the combustion section 400, and the housing 110 covers them. Inside the housing 110, the reforming section 300 and the combustion section 400 may be disposed so that one end of each is flush with the other. As another example, the housing 110 may further cover the vaporization section 200 and the mixed gas conduit 230.

[0018] An oxidant gas is supplied to the housing 110 from outside the fuel cell module 10. The oxidant gas is a gas containing oxygen, and may be, for example, air. The supplied oxidant gas passes through the inside of the housing 110 and is supplied to the fuel cell stack 900 via an oxidant gas introduction channel 150 connected to the bottom of the housing 110.

[0019] While flowing inside the housing 110, the oxidant gas exchanges heat with the heat inside the housing 110, and the oxidant gas is supplied to the fuel cell stack 900 in an elevated temperature state. The housing 110 may be provided with a compartment (oxidant gas chamber) into which the oxidant gas flows, located adjacent to a compartment (exhaust gas guide chamber) into which the exhaust gas is guided, so that heat exchange with the exhaust gas generated by the combustion of the off-gas can be efficiently performed.

[0020] The housing 110 discharges exhaust gas generated by the combustion of off-gas in the combustion section 400. The housing 110 may include the above-mentioned exhaust gas guiding chamber near the reforming section 300 so that the exhaust gas can efficiently exchange heat with the reforming section 300. For example, when the reforming section 300 is provided with the hole 320 (see FIG. 5 ), the exhaust gas guiding chamber may be provided above the reforming section 300. An oxidant gas chamber may be provided adjacent to and above the exhaust gas guiding chamber. In this case, the exhaust gas exchanges heat with the reforming section 300 through the hole in the reforming section 300. The exhaust gas then transfers heat to the oxidant gas in the oxidant gas chamber in the exhaust gas guiding chamber where it has flowed, and is then discharged to the outside of the fuel cell module 10.

[0021] The temperature inside the housing 110 may be monitored by a thermocouple 620. For accurate monitoring, the thermocouple 620 may be located near the ignition device 610.

[0022] The vaporizing section 200 generates water vapor and supplies a mixed gas containing the water vapor and the raw material gas to the reforming section 300. In the example of FIG. 1, the vaporizing section 200 is provided above the housing 110. The vaporizing section 200 may include, for example, an electric heater, and may supply the mixed gas heated by the electric heater to the reforming section 300.

[0023] The vaporizer 200 is connected to a water / gas supply pipe 220, and obtains water and raw material gas from outside the fuel cell module 10 through the water / gas supply pipe 220. The water / gas supply pipe 220 may be connected to the vaporizer 200 in the form of a multi-pipe, or the water supply pipe and the gas supply pipe may be connected to the vaporizer 200 separately. For example, in the case of a multi-pipe, a cylindrical water supply pipe may be arranged on the central axis, and a cylindrical gas supply pipe may be arranged to surround the water supply pipe. The supplied water is heated in the vaporizer 200 and partly becomes water vapor. The vaporizer 200 may include a mixing layer filled with ceramic balls made of alumina or the like to promote mixing of the water vapor and raw material gas.

[0024] As shown in FIG. 1, the reforming unit 100 is disposed above and spaced apart from the fuel cell stack 900. As shown in FIG. 1, the fuel cell module 10 is configured by integrally covering the reforming unit 100 and the fuel cell stack 900 with a heat insulating material 910. In the example of FIG. 1, the fuel cell stack 900 is a flat plate type, and the exposed fuel cell stack 900, together with the reforming unit 100, is protected by the heat insulating material 910. Here, the fuel cell stack 900 may have another shape, such as a cylindrical shape or a cylindrical flat plate type, but it cannot be used exposed and must be housed in, for example, a container. Therefore, from the perspective of miniaturization, the fuel cell stack 900 is preferably a flat plate type.

[0025] Fig. 2 is a plan view of the reformer section 300 and the combustor section 400 used in the reforming unit 100 of Fig. 1. The plan view of Fig. 2 is a view of a surface parallel to the xy plane, and shows the longitudinal outer dimension Lx and the width outer dimension Ly of the reformer section 300 and the combustor section 400 including the housing 110. The plan view also shows the corresponding outer dimensions of the fuel cell stack 900. As shown in Fig. 2, in this embodiment, the longitudinal and width outer dimensions of the fuel cell stack 900 and the housing 110 are the same.

[0026] When the reforming unit 100 is disposed above the fuel cell stack 900, the upper surface of the fuel cell stack 900 receives radiant heat from the housing 110, which includes the combustion section 400. In conventional reforming units 100, the reforming section 300 and the combustion section 400 often differ significantly in size and shape. In conventional reforming units 100, for example, the heat exchange between the exhaust gas from the combustion section 400 and the reforming section 300 can be uneven in the length and width directions, or the shape of the housing 110 can become distorted. As a result, the radiant heat from the housing 110 also varies depending on the location, which can reduce the operating performance of the fuel cell.

[0027] In this embodiment, the external dimensions of the fuel cell stack 900 and the housing 110 in the lengthwise and widthwise directions are the same. Therefore, the upper surface of the fuel cell stack 900 receives radiant heat from the housing 110 almost evenly, making it difficult for temperature unevenness to occur. In other words, the reforming unit 100 according to this embodiment can suppress temperature unevenness in the fuel cell stack 900 and suppress deterioration in the operating performance of the fuel cell.

[0028] Here, the flat-plate type fuel cell stack 900 used in an exposed state is particularly susceptible to the effects of radiant heat. For this reason, the reforming unit 100 according to this embodiment is particularly suitable when used together with the flat-plate type fuel cell stack 900 to form a fuel cell module 10. As described above, the fuel cell module 10 is covered with a heat insulating material 910. In this embodiment, the fuel cell stack 900 and the housing 110 have the same external dimensions in the length and width directions, so there is no need to use a heat insulating material 910 with a special shape that matches the irregularities of the housing 110 as in the prior art. In other words, the heat insulating material 910 of the fuel cell module 10 can be formed by combining flat-plate heat insulating members. This makes it possible to simplify the manufacturing process of the fuel cell module 10 and reduce manufacturing costs.

[0029] It is preferable that the external dimensions of the fuel cell stack 900 and the housing 110 are completely identical in the length and width directions, but they do not have to be completely identical as long as the radiant heat is approximately uniform. For example, even if there is a 5% difference in the external dimensions of the fuel cell stack 900 and the housing 110 in the length and width directions, it is believed that there is an effect of suppressing temperature unevenness compared to conventional technology. In the present disclosure, "identical" is not limited to being completely identical. For example, even if there is a difference in external dimensions of less than 5%, it is included in the range of "identical."

[0030] Furthermore, it is preferable that the fuel cell stack 900 and the housing 110 have the same external dimensions in the length direction and width direction, but it is sufficient that the external dimensions in at least one of the length direction and width direction are the same.

[0031] (Second embodiment) The reforming unit 100 according to the second embodiment is configured as described below. However, the description of the same components as those in the first embodiment will be omitted, and only the components different from those in the first embodiment will be described below.

[0032] 3 is a plan view of the reformer section 300 and the combustor section 400 used in the reforming unit 100 according to this embodiment. In this embodiment, the housing 110 has the same external dimensions in the length direction and the same external dimensions in the width direction. That is, for the reformer section 300 and the combustor section 400 including the housing 110, the external dimensions in the length direction Lxy are the same as the external dimensions in the width direction Lxy. The external dimensions in the length direction and the width direction of the fuel cell stack 900 and the housing 110 are also the same. That is, the fuel cell stack 900 has the external dimensions Lxy in the length direction and the width direction.

[0033] Here, the external dimensions in the length direction and the external dimensions in the width direction do not have to be completely the same for the fuel cell stack 900 and the housing 110. In other words, when viewed in plan from the vertical direction (z-axis direction), the shapes of the fuel cell stack 900 and the housing 110 do not have to be perfect squares, as long as they are approximately square.

[0034] In addition to the same effects as the first embodiment, the reforming unit 100 of this embodiment has the advantage that the external dimensions in the width direction and length direction are the same, thereby realizing a fuel cell module 10 with a high degree of freedom in placement when assembling the fuel cell.

[0035] (Third embodiment) The reforming unit 100 according to the third embodiment is configured as described below. However, the description of the same components as those in the first embodiment will be omitted, and only the components different from those in the first embodiment will be described below.

[0036] 4 is a schematic diagram of a fuel cell module 10 including a reforming unit 100 according to this embodiment. The reforming unit 100 according to this embodiment does not include a vaporization section 200. A mixed gas obtained by mixing raw material gas and atomized water is supplied to the reforming section 300 from outside the fuel cell module 10 via a mixed gas conduit 231. The atomized water is water that has been atomized to such an extent that it becomes water vapor due to the heat inside the housing 110. In this embodiment, the reforming section 300 uses water vapor formed by vaporizing the micro-particles of water inside the housing 110, rather than water vapor generated in the vaporization section 200.

[0037] In addition to the same effects as in the first embodiment, the reforming unit 100 according to this embodiment has the effect of realizing an even smaller fuel cell module 10 by omitting the generally large vaporization section 200. Here, like the second embodiment, the reforming unit 100 according to this embodiment can also have the same external dimensions in the width and length directions.

[0038] (Fourth embodiment) The reforming unit 100 according to the fourth embodiment is configured as described below. However, the description of the same components as those in the second embodiment will be omitted, and only the components different from those in the second embodiment will be described below.

[0039] 5 is a plan view of the reforming section 300 and the combustion section 400 used in the reforming unit 100 according to this embodiment. When viewed vertically from above, the reforming section 300 has a donut shape with a hole 320. The hole 320 may be provided in the center of the reforming section 300. The combustion section 400 may also have a hole at a position corresponding to the hole 320 in the reforming section 300, for passing at least the oxidant gas introduction channel 150 therethrough.

[0040] 5, a reformed gas supply channel 330 extending from the reforming section 300 passes by the side of the combustion section 400 and is connected to a manifold for supplying reformed gas to the fuel cell stack 900. In addition, a reformed gas discharge channel 331 extending from a manifold for discharging reformed gas from the fuel cell stack 900 may pass by the side of the combustion section 400. In this case, the reformed gas supply channel 330 and the reformed gas discharge channel 331 may be located near one side of the combustion section 400.

[0041] Furthermore, the oxidant gas discharge channel 151 may pass through the hole in the combustion section 400 together with the oxidant gas inlet channel 150. Here, the manifolds of the fuel cell stack 900 connected to the oxidant gas inlet channel 150 and the oxidant gas discharge channel 151 may be provided along one side of the fuel cell stack 900. In other words, the manifold for introducing the oxidant gas and the manifold for discharging the oxidant gas do not need to be provided in the center of the fuel cell stack 900. In this case, the oxidant gas inlet channel 150 and the oxidant gas discharge channel 151 may have a shape that bends in the space between the reforming unit 100 and the fuel cell stack 900.

[0042] Furthermore, the fuel cell stack 900 may have a shape other than a square when viewed vertically in a plan view. As shown in Fig. 5, the fuel cell stack 900 may have a shape in which corners are cut at an angle or some sides have notches, as long as the maximum distances in the width and length directions of the fuel cell stack 900 are the same as those of the housing 110.

[0043] Although the reforming unit 100 according to this embodiment has some parts that do not match in shape, the fuel cell stack 900 and the housing 110 have the same external dimensions in the length and width directions, and therefore, compared to conventional technology, it is possible to suppress temperature unevenness in the fuel cell stack 900. Furthermore, because the reforming unit 100 according to this embodiment has the same external dimensions in the length and width directions, it is possible to realize a fuel cell module 10 that has a high degree of freedom in placement when assembling the fuel cell.

[0044] 6, the reforming unit 100 according to this embodiment can arrange the vaporizing section 200 in the hole 320 of the reforming section 300. With this configuration, the reforming unit 100 according to this embodiment can realize an even smaller fuel cell module 10.

[0045] (Fifth embodiment) The reforming unit 100 according to the fifth embodiment is configured as described below. However, the description of the same components as those in the fourth embodiment will be omitted, and only the components different from those in the fourth embodiment will be described below.

[0046] FIG. 7 is a plan view of a reforming section 300 used in a reforming unit 100 according to a fifth embodiment. The reforming section 300 has a shape with a hole 320 when viewed vertically. The reforming section 300 is connected to a mixed gas conduit 230, which is a flow path for the mixed gas, at a first position and to a reformed gas supply channel 330, which is a flow path for the reformed gas, at a second position. The second position is close to the first position, and a partition 310 is provided in the closest path. The partition 310 is, for example, a space that partially cuts the reforming section 300. Therefore, the flow path from the first position to the second position in the reforming section 300 is provided so as to circumvent the hole 320. By providing the partition 310 in the reforming section 300, the flow path from the first position to the second position can be lengthened, thereby improving the reforming efficiency in the reforming section 300.

[0047] The reforming unit 100 according to this embodiment has the same effects as the fourth embodiment, and in addition, since the reforming section 300 has the above-described configuration, it is possible to improve reforming efficiency while being compact.

[0048] Furthermore, in the reforming unit 100 according to this embodiment, the vaporizing section 200 can be disposed in the first position of the reforming section 300, as shown in FIG. 8. In this case, the water / gas supply pipe 220 is connected at the first position instead of the mixed gas conduit 230. When the reforming section 300 has the vaporizing section 200 disposed in the first position, the reforming unit 100 may supply the off-gas to a heat exchanger 920 located outside the fuel cell module 10, as shown in FIG. 9. The heat exchanger 920 may be installed on a side of the fuel cell module 10. Furthermore, a supply path 441 that supplies the off-gas to the heat exchanger 920 may have a combustion catalyst disposed in the flow path.

[0049] (Sixth embodiment) The reforming unit 100 according to the sixth embodiment is configured as described below. However, the description of the same components as those in the second embodiment will be omitted, and only the components different from those in the second embodiment will be described below.

[0050] 10 is a plan view of the reforming section 300 and the combustion section 400 used in the reforming unit 100 according to the sixth embodiment. The reforming unit 100 may have a cylindrical housing 110 that houses the combustion section 400 and the reforming section 300. In this case, the diameter of the housing 110 is the same as the external dimensions of the fuel cell stack 900.

[0051] In the reforming unit 100 according to this embodiment, the shape of the housing 110 is different from that of the fuel cell stack 900, but because the diameter of the housing 110 is the same as the external dimensions of the fuel cell stack 900, it is possible to suppress temperature unevenness in the fuel cell stack 900 compared to conventional technology. Furthermore, because the external dimensions of the reforming unit 100 according to this embodiment are the same in the width direction and length direction, it is possible to realize a fuel cell module 10 that has a high degree of freedom in placement when assembling the fuel cells.

[0052] (Seventh embodiment) The reforming unit 100 according to the seventh embodiment is configured as described below. However, the description of the same components as those in the first embodiment will be omitted, and only the components different from those in the first embodiment will be described below.

[0053] Fig. 11 is a schematic diagram of a fuel cell module 10 including a reforming unit 100 according to this embodiment. Fig. 12 is a side view of the fuel cell module 10 of Fig. 11. Fig. 13 is a plan view of the fuel cell module 10 of Fig. 11. As shown in Figs. 11 to 13, the reforming unit 100 according to this embodiment has a configuration in which the vaporization section 200 is integrated with the reforming section 300.

[0054] In this embodiment, the combustion section 400 is made up of an oxidant off-gas combustion section 400A and a reformed off-gas combustion section 400B. The oxidant off-gas (off-gas mainly containing oxidant gas) discharged from the fuel cell stack 900 passes through an off-gas supply channel 440 and is supplied to the oxidant off-gas combustion section 400A. The reformed off-gas (off-gas mainly containing reformed gas) discharged from the fuel cell stack 900 passes through a reformed gas discharge channel 331 and is supplied to the reformed off-gas combustion section 400B. An oxidant gas flow channel 120 is provided along the inner wall of the housing 110. A bus bar 930 is connected to the fuel cell stack 900 and is used to extract the electric power generated in the fuel cell stack 900.

[0055] In addition to the same effects as those of the first embodiment, the reforming unit 100 of this embodiment has the effect of realizing an even smaller fuel cell module 10 by integrating the vaporization section 200 with the reforming section 300. Here, the reforming unit 100 of this embodiment can also have the same external dimensions in the width direction and length direction, as in the second embodiment.

[0056] Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and alterations based on the present disclosure, and therefore, it should be noted that these modifications and alterations are included in the scope of the present disclosure. [Explanation of symbols]

[0057] 10 Fuel Cell Module 100 Reforming Unit 110 Housing 120 Oxidant gas flow path 150 Oxidant gas inlet 151 Oxidant gas exhaust channel 200 Vaporization section 220 Water and gas supply pipes 230 Mixed gas pipe 231 Mixed gas pipe 300 Reforming Section 310 Partition 320 holes 330 Reformed gas supply line 331 Reformed gas exhaust channel 400 Combustion section 400A Oxidant off-gas combustion section 400B Reformed Offgas Combustion Unit 440 Offgas supply line 441 Supply route 610 Ignition system 620 Thermocouple 900 fuel cell stack 910 Insulation 920 heat exchanger 930 Busbar

Claims

1. A reforming unit disposed above and spaced apart from the fuel cell stack, a combustion section that combusts off-gas discharged from the fuel cell stack; a reforming section disposed above the combustion section, which reforms a mixed gas containing a raw material gas to generate a reformed gas containing hydrogen to be supplied to the fuel cell stack; a housing that accommodates the combustion section and the reforming section, The reforming unit has the same outer dimensions in the width direction and length direction as the fuel cell stack and the housing.

2. The reforming unit according to claim 1 , wherein the housing has an outer dimension in the width direction that is the same as an outer dimension in the length direction.

3. The reforming unit according to claim 1 or 2, wherein the reforming section is supplied with the mixed gas obtained by mixing the raw material gas and atomized water.

4. The modified portion is A shape in which a hole is provided when viewed in a plan view from the vertical direction, a first position connected to a mixed gas conduit that is a flow path for the mixed gas; a reformed gas supply passage, which is a flow path of the reformed gas, is connected at a second position adjacent to the first position; The reforming unit according to claim 1 , wherein a flow path from the first position to the second position in the reforming section is provided so as to circumnavigate the hole.

5. A fuel cell module comprising a reforming unit according to any one of claims 1 to 4.

6. A fuel cell device comprising the fuel cell module according to claim 5.

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