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 Art

[0002] A reforming unit for supplying reformed gas to a fuel cell generally mainly includes a combustion unit that burns off-gas of the fuel cell, and a reforming unit that generates reformed gas from a mixed gas of a raw material gas and steam. The reforming unit may be connected to the reforming unit and further include a vaporization unit that vaporizes water. The reforming unit is configured, for example, such that the combustion unit, the reforming unit, and the vaporization unit are stacked in this order (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, it has been known that the size and shape of a reforming unit affect the operating performance of a fuel cell including power generation efficiency. As one of the causes, it is considered that depending on the size and shape of the reforming unit, the radiant heat from the housing of the reforming unit is unevenly transmitted to the cell stack of the fuel cell, causing temperature unevenness in the cell stack.

[0005] In view of the problems of the prior art as described above, an object of the present disclosure is to provide a reforming unit, a fuel cell module, and a fuel cell device capable of suppressing temperature unevenness in a cell stack.

Means for Solving the Problems

[0006] To solve the above problems, a reforming unit according to an embodiment of the present disclosure is A reforming unit disposed separately above a fuel cell stack, a combustion part that burns off-gas discharged from the fuel cell stack, a reforming part disposed above the combustion part that generates a reformed gas containing hydrogen to be supplied to the fuel cell stack by reforming a mixed gas containing a raw material gas, and a housing that houses the combustion part and the reforming part, wherein at least one of the outer dimensions of the fuel cell stack and the housing in the width direction and the length direction is the same.

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

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

Advantages 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 the cell stack.

Brief Description of the Drawings

[0010]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0011] (First Embodiment) FIG. 1 is a schematic view of a fuel cell module 10 including a reforming unit 100 according to the first embodiment. The fuel cell module 10 is a module constituting a fuel cell device. The fuel cell module 10 may constitute a fuel cell device together with other devices (for example, pumps and sensors) for operating the fuel cell module 10. In the example of FIG. 1, the fuel cell module 10 includes a 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 unit 400, a reforming unit 300, and a housing 110. However, the components of the reforming unit 100 are not limited to these. In the present embodiment, the reforming unit 100 further includes a vaporization unit 200.

[0013] Here, as shown in FIG. 1, orthogonal coordinates corresponding to the orientation of the reforming unit 100 are set. The z-axis direction is the direction in which the combustion unit 400 and the reforming unit 300 are stacked in the reforming unit 100. The x-axis direction corresponds to the length direction of the combustion unit 400, the reforming unit 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 unit 400, the reforming unit 300, and the fuel cell stack 900. In the following, the z-axis direction may be referred to as the vertical direction or the stacking direction. The upward direction means the positive z-axis direction. The downward direction means the negative z-axis direction. 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 orthogonal coordinate system is also appropriately used in the drawings after FIG. 2. The positional relationship may be described using the axes or planes of this orthogonal coordinate system.

[0014] The combustion unit 400 burns the off-gas discharged from the fuel cell stack 900. The combustion unit 400 is also referred to as 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 unit 400 through the off-gas supply passage 440. The combustion unit 400 includes an ignition device 610 such as an ignition heater to ignite the off-gas.

[0015] The reforming unit 300 generates reformed gas to be supplied to the fuel cell stack 900 by reforming a mixed gas containing a raw material gas. The reforming unit 300 houses a reforming catalyst, and reforms the mixed gas with the reforming catalyst to generate reformed gas containing hydrogen. Here, the raw material gas can 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, in addition to the raw material gas, water vapor generated by vaporizing water in the vaporizing unit 200. The mixed gas is supplied to the reforming unit 300 through the mixed gas conduit 230. Further, the reformed gas is supplied to the fuel cell stack 900 through the reformed gas supply path 330. Here, the reforming catalyst is not limited to a specific one, and generally known ones can be used. Further, the outer shape of the reforming unit 300 is not limited to a specific one, and can be, for example, circular, elliptical, rectangular, or the like.

[0016] Here, the position where the mixed gas conduit 230 is connected to the reforming unit 300 may be near the end of the upper surface of the reforming unit 300. And the mixed gas conduit 230 may extend without bending. By connecting the reforming unit 300 and the mixed gas conduit 230 in this way, the structure of the reforming unit 100 is simplified, and the manufacturing process can be simplified and the manufacturing cost can be reduced.

[0017] The housing 110 houses the combustion unit 400 and the reforming unit 300. In the example of FIG. 1, the reforming unit 300 is disposed above the combustion unit 400, and the housing 110 covers them. Inside the housing 110, the reforming unit 300 and the combustion unit 400 may be arranged so that one end is aligned. As another example, the housing 110 may further cover the vaporizing unit 200 and the mixed gas conduit 230.

[0018] An oxidant gas is supplied to the housing 110 from the outside of 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 the oxidant gas introduction path 150 connected to the lower part of the housing 110.

[0019] While flowing inside the housing 110, the oxidant gas is heat-exchanged with the heat inside the housing 110 and supplied to the fuel cell stack 900 in a state where its temperature has risen. The housing 110 may include a section (oxidant gas chamber) into which the oxidant gas flows at a position adjacent to a section (exhaust gas induction chamber) where the exhaust gas is induced so that heat exchange with the exhaust gas generated by the combustion of the off-gas is efficiently performed.

[0020] The housing 110 discharges the exhaust gas generated by the combustion of the off-gas in the combustion section 400. Here, the housing 110 may include the above exhaust gas induction chamber near the reforming section 300 so that the exhaust gas can efficiently perform heat exchange with the reforming section 300. For example, when a hole 320 is provided in the reforming section 300 (see FIG. 5), the exhaust gas induction chamber may be provided above the reforming section 300. And an oxidant gas chamber may be provided adjacent above the exhaust gas induction chamber. At this time, the exhaust gas exchanges heat with the reforming section 300 through the hole of the reforming section 300. And the exhaust gas transfers heat to the oxidant gas in the oxidant gas chamber in the inflowed exhaust gas induction chamber, and then is discharged to the outside of the fuel cell module 10.

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

[0022] The vaporization 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 vaporization section 200 is provided above the housing 110. The vaporization section 200 may include, for example, an electric heater and supply the mixed gas heated by the electric heater to the reforming section 300.

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

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

[0025] FIG. 2 is a plan view of the reforming section 300 and the combustion section 400 used in the reforming unit 100 of FIG. 1. The plan view of FIG. 2 is a view of a plane parallel to the xy plane, and shows the outer dimension Lx in the length direction and the outer dimension Ly in the width direction of the reforming section 300 and the combustion section 400 including the housing 110. Also, the outer dimensions of the corresponding fuel cell stack 900 are shown. As shown in FIG. 2, in the present embodiment, the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are the same.

[0026] When the reforming unit 100 is arranged above the fuel cell stack 900, the upper surface of the fuel cell stack 900 receives radiant heat from the housing 110 including the combustion unit 400. In conventional reforming units 100, the sizes and shapes of the reforming unit 300 and the combustion unit 400 often differ significantly. In a conventional reforming unit 100, for example, there may be a bias in the length direction and the width direction in terms of heat exchange between the exhaust gas from the combustion unit 400 and the reforming unit 300, or the shape of the housing 110 may become distorted. Therefore, there is also a bias in the radiant heat from the housing 110 depending on the location, which may reduce the operating performance of the fuel cell.

[0027] In the present embodiment, the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are the same. Therefore, the upper surface of the fuel cell stack 900 receives radiant heat from the housing 110 almost evenly, and temperature unevenness is less likely to occur. That is, the reforming unit 100 according to the present embodiment can suppress temperature unevenness of the fuel cell stack 900 and suppress a decrease in the operating performance of the fuel cell.

[0028] Here, the flat plate type fuel cell stack 900 used by being exposed is particularly susceptible to the influence of radiant heat. Therefore, the reforming unit 100 according to the present embodiment is particularly suitable when constituting the fuel cell module 10 together with the flat plate type fuel cell stack 900. Further, as described above, the fuel cell module 10 is configured to be covered with the heat insulating material 910. In the present embodiment, since the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are the same, it is not necessary to use a heat insulating material 910 having a special shape adapted to the unevenness of the housing 110 as in the prior art. That is, the heat insulating material 910 of the fuel cell module 10 can be configured by combining flat heat insulating members. Therefore, simplification of the manufacturing process of the fuel cell module 10 and reduction of the manufacturing cost can be achieved.

[0029] It is preferable that the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are exactly the same, but they do not have to be exactly the same as long as the radiant heat is substantially uniform. For example, even if there is a 5% difference in the respective outer dimensions in the length direction and the width direction between the fuel cell stack 900 and the housing 110, it is considered that there is an effect of suppressing temperature unevenness compared to the prior art. In the present disclosure, "identical" is not limited to exactly the same. For example, even if there is a difference in outer dimensions within 5%, it is included in the same range.

[0030] Also, it is preferable that the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are the same, but it is sufficient if at least one of the outer dimensions in the length direction and the width direction is 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 configuration as that of the first embodiment is omitted, and the configuration different from that of the first embodiment is described below.

[0032] FIG. 3 is a plan view of the reforming section 300 and the combustion section 400 used in the reforming unit 100 according to the present embodiment. In the present embodiment, the outer dimension in the length direction and the outer dimension in the width direction of the housing 110 are the same. That is, for the reforming section 300 and the combustion section 400 including the housing 110, the outer dimension Lxy in the length direction is the same as the outer dimension Lxy in the width direction. And the outer dimensions of the fuel cell stack 900 and the housing 110 in the length direction and the width direction are the same. That is, the fuel cell stack 900 has an outer dimension Lxy in the length direction and the width direction.

[0033] Here, for the fuel cell stack 900 and the housing 110, the outer dimension in the length direction and the outer dimension in the width direction do not have to be exactly the same. That is, 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 a perfect square, but may be a substantially square.

[0034] In addition to the same effects as those of the first embodiment, the reforming unit 100 according to the present embodiment has an effect that a fuel cell module 10 with a high degree of freedom in arrangement can be realized because the outer dimensions in the width direction and the length direction are the same 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 configuration as that of the first embodiment is omitted, and the configuration different from that of the first embodiment is described below.

[0036] FIG. 4 is a schematic diagram of a fuel cell module 10 including a reforming unit 100 according to the present embodiment. The reforming unit 100 according to the present embodiment does not include a vaporization unit 200. Then, a mixed gas in which a raw material gas and atomized water are mixed is supplied to the reforming unit 300 from the outside of the fuel cell module 10 through a mixed gas conduit 231. Here, the atomized water is water that has been finely atomized to the extent that it becomes water vapor by the heat inside the housing 110. In the present embodiment, the reforming unit 300 uses water vapor generated by the atomized water vaporizing inside the housing 110 instead of the water vapor generated in the vaporization unit 200.

[0037] In addition to the same effects as those of the first embodiment, the reforming unit 100 according to the present embodiment has an effect that a further smaller fuel cell module 10 can be realized by omitting the generally large-sized vaporization unit 200. Here, the reforming unit 100 according to the present embodiment can also make the outer dimensions in the width direction and the length direction the same as those of the second embodiment.

[0038] (Fourth Embodiment) The reforming unit 100 according to the fourth embodiment is configured as described below. However, the description of the same configuration as that of the second embodiment is omitted, and the configuration different from that of the second embodiment is described below.

[0039] FIG. 5 is a plan view of the reforming unit 300 and the combustion unit 400 used in the reforming unit 100 according to the present embodiment. The reforming unit 300 has a donut shape with a hole 320 when viewed from the vertical direction in plan view. The hole 320 may be provided in the central portion of the reforming unit 300. Further, the combustion unit 400 may have a hole for passing at least the oxidant gas introduction passage 150 at a position corresponding to the hole 320 of the reforming unit 300.

[0040] As shown in FIG. 5, the reformed gas supply passage 330 extending from the reforming unit 300 passes through the side of the combustion unit 400 and is connected to the manifold for supplying reformed gas of the fuel cell stack 900. Further, a reformed gas discharge passage 331 extending from the manifold for discharging reformed gas of the fuel cell stack 900 may pass through the side of the combustion unit 400. At this time, the reformed gas supply passage 330 and the reformed gas discharge passage 331 may be near one side of the combustion unit 400.

[0041] Further, together with the oxidant gas introduction passage 150, an oxidant gas discharge passage 151 may pass through the hole of the combustion unit 400. Here, the manifolds of the fuel cell stack 900 connected to the oxidant gas introduction passage 150 and the oxidant gas discharge passage 151 may be provided along one side of the fuel cell stack 900. That is, the manifold for introducing oxidant gas and the manifold for discharging oxidant gas do not need to be provided in the central portion of the fuel cell stack 900. In this case, the oxidant gas introduction passage 150 and the oxidant gas discharge passage 151 may have a shape that bends in the space between the reforming unit 100 and the fuel cell stack 900.

[0042] Further, the fuel cell stack 900 may have a shape different from a square when viewed from the vertical direction in plan view. As shown in FIG. 5, the fuel cell stack 900 may have a shape in which the corners are cut obliquely or there are notches in some sides as long as the maximum distances in the width direction and the length direction are the same as those of the housing 110.

[0043] Although there are parts with non-matching shapes, the outer dimensions of the fuel cell stack 900 and the housing 110 in the length and width directions are the same in the reforming unit 100 according to the present embodiment. Therefore, compared with the prior art, the temperature unevenness of the fuel cell stack 900 can be suppressed. Further, since the outer dimensions of the reforming unit 100 according to the present embodiment are the same in the length and width directions, a fuel cell module 10 with a high degree of freedom in arrangement can be realized when assembling the fuel cell.

[0044] Also, as shown in FIG. 6, the vaporization unit 200 of the reforming unit 100 according to the present embodiment can be arranged at the portion of the hole 320 of the reforming unit 300. With such a configuration, the reforming unit 100 according to the present 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 configuration as that of the fourth embodiment is omitted, and the configuration different from that of the fourth embodiment is described below.

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

[0047] In addition to the same effects as those of the fourth embodiment, the reforming unit 100 according to the present embodiment can increase the reforming efficiency while being small in size because the reforming unit 300 has the above-described configuration.

[0048] Further, as shown in FIG. 8, in the reforming unit 100 according to the present embodiment, the vaporizing unit 200 can be disposed at a portion at the first position of the reforming unit 300. At this time, instead of the mixed gas conduit 230, the water / gas supply pipe 220 is connected at the first position. When the reforming unit 300 disposes the vaporizing unit 200 at the portion at the first position, as shown in FIG. 9, the reforming unit 100 may supply the off-gas to a heat exchanger 920 outside the fuel cell module 10. The heat exchanger 920 may be installed on the side surface of the fuel cell module 10. Further, in the supply path 441 for supplying the off-gas to the heat exchanger 920, a combustion catalyst may be 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 configuration as that of the second embodiment is omitted, and the configuration different from that of the second embodiment is described below.

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

[0051] Although the shapes of the fuel cell stack 900 and the housing 110 are different in the reforming unit 100 according to the present embodiment, since the diameter of the housing 110 is the same as the outer dimension of the fuel cell stack 900, temperature unevenness of the fuel cell stack 900 can be suppressed as compared with the prior art. Further, since the outer dimensions in the width direction and the length direction are the same in the reforming unit 100 according to the present embodiment, a fuel cell module 10 with a high degree of freedom in arrangement can be realized when assembling the fuel cell.

[0052] (Seventh Embodiment) The reforming unit 100 according to the seventh embodiment is configured as described below. However, the description of the same configuration as that of the first embodiment is omitted, and the configuration different from that of the first embodiment is described below.

[0053] FIG. 11 is a schematic diagram of a fuel cell module 10 including the reforming unit 100 according to the present 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 the present embodiment has a configuration in which the vaporization unit 200 is integrated with the reforming unit 300.

[0054] In the present embodiment, the combustion unit 400 is composed of an oxidant off-gas combustion unit 400A and a reformed off-gas combustion unit 400B. The oxidant off-gas (off-gas mainly containing oxidant gas) discharged from the fuel cell stack 900 is supplied to the oxidant off-gas combustion unit 400A through the off-gas supply passage 440. Further, the reformed off-gas (off-gas mainly containing reformed gas) discharged from the fuel cell stack 900 is supplied to the reformed off-gas combustion unit 400B through the reformed gas discharge passage 331. Further, the oxidant gas flow passage 120 is provided along the inner wall of the housing 110. Further, the 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 according to the present embodiment has an effect that a smaller fuel cell module 10 can be realized by integrating the vaporization unit 200 with the reforming unit 300. Here, the reforming unit 100 according to the present embodiment can also have the same outer dimensions in the width direction and the length direction as those of 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. Therefore, it should be noted that these modifications and alterations are included within the scope of the present disclosure.

Explanation of Signs

[0057] 10 Fuel cell module 100 Reformer unit 110 Housing 120 Oxidant gas flow path 150 Oxidant gas introduction path 151 Oxidant gas discharge path 200 Vaporization section 220 Water / gas supply pipe 230 Mixed gas conduit 231 Mixed gas conduit 300 Reforming section 310 Partition section 320 Hole 330 Reformed gas supply path 331 Reformed gas discharge path 400 Combustion section 400A Oxidant off-gas combustion section 400B Reformed off-gas combustion section 440 Off-gas supply path 441 Supply path 610 Ignition device 620 Thermocouple 900 Fuel cell stack 910 Heat insulating material 920 Heat exchanger 930 Bus bar

Claims

Claim 1: A reforming unit disposed spaced above a fuel cell stack, comprising: a combustion section that burns off-gas discharged from the fuel cell stack; a reforming section disposed above the combustion section that 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 houses the combustion section and the reforming section; and the reforming unit, wherein outer dimensions of the fuel cell stack and the housing in a width direction and a length direction are the same. Claim 2: The reforming unit according to Claim 1, wherein an outer dimension in the width direction and an outer dimension in the length direction of the housing are the same. Claim 3: The reforming unit according to Claim 1 or 2, wherein the reforming section is supplied with the mixed gas in which the raw material gas and atomized water are mixed. Claim 4: The reforming section is in a shape provided with holes when viewed in a plan view from a vertical direction, connected to a mixed gas conduit, which is a flow path of the mixed gas, at a first position, connected to a reformed gas supply path, which is a flow path of the reformed gas, at a second position close to the first position, and the flow path from the first position to the second position in the reforming section is provided so as to go around the holes. The reforming unit according to any one of Claims 1 to 3. Claim 5: A fuel cell module comprising the reforming unit according to any one of Claims 1 to 4. Claim 6: A fuel cell device comprising the fuel cell module according to Claim 5.

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