JP5154272B2 - Fuel cell reformer - Google Patents

Description

  The present invention relates to a reformer for a fuel cell that reforms raw fuel into a reformed gas used in a fuel cell system.

  A polymer electrolyte fuel cell generates electric power by converting chemical energy of hydrogen into electric energy. Practically, hydrogen used as a fuel for a polymer electrolyte fuel cell is a natural gas, a hydrocarbon gas such as naphtha, or a raw fuel gas of alcohols such as methanol and water vapor, which can be obtained relatively easily and inexpensively. Are mixed and reformed by a reformer. Hydrogen gas obtained by reforming is supplied to the fuel electrode of the fuel cell and used for power generation.

Generally, the reformer includes a burner for supplying heat necessary for the reforming reaction of the raw fuel gas with steam. The combustion gas generated by burning the fuel with the burner is guided from the combustion cylinder to a path provided in the vicinity of the reforming reaction section, whereby the thermal energy of the combustion gas is used for the reforming reaction (for example, Patent Documents). 1 and 2).
JP 2007-15911 A International Publication No. 03/078311 Pamphlet

  However, the reformers described in Patent Documents 1 and 2 flow the combustion exhaust gas generated by burning the fuel with a burner inside the reforming section, thereby generating the thermal energy of the combustion exhaust gas and generating or reforming high-temperature steam. Therefore, the reforming section must be arranged outside the combustion exhaust gas passage. In addition, a carbon monoxide shifter and a carbon monoxide remover for reducing carbon monoxide contained in the reformed gas generated by the reformer are further outside the flow path including the reformer. Therefore, the flow path is complicated. As a result, the diameter of the reforming part is increased, and this is a cause of increasing the complexity and size of the entire reformer.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a fuel cell reforming device having a simple configuration.

In order to solve the above problems, a fuel cell reforming apparatus according to an aspect of the present invention is a fuel cell reforming apparatus that reforms a raw fuel into a hydrogen-rich reformed gas. A selective reforming section for generating gas, a shift shift section for reducing carbon monoxide contained in the reformed gas by a shift reaction, and selective oxidation of carbon monoxide contained in the reformed gas that has passed through the shift shift section. The selective oxidation unit to be reduced, the reforming unit, the shift shift conversion unit, and the selective oxidation unit are stored in this order in a straight line, and the combustion that burns raw fuel to generate combustion exhaust gas and means, disposed on an outer periphery of the reforming reaction tube, diameter than reforming reaction tube is rather large, an outer cylinder covering the entire side of the reforming reaction tube, a. Between the reforming reaction cylinder and the outer cylinder, a heating passage through which the combustion exhaust gas passes is formed in order to heat the reforming reaction cylinder. The heating channel is formed so that the combustion exhaust gas passes from the reforming unit side toward the selective oxidation unit side.

  According to this aspect, since the reforming section, the shift shift conversion section, and the selective oxidation section are housed in this order in one reforming reaction cylinder, the reformed gas can be formed without forming a complicated-shaped flow path. The contained carbon monoxide can be reduced. In addition, by passing the combustion exhaust gas through the heating flow path between the reforming reaction cylinder and the outer cylinder, heat necessary for the reforming reaction inside the reaction reforming cylinder can be supplied, and heating of a heater or the like Means become unnecessary. In addition, by using a heating flow path between the reforming reaction cylinder and the outer cylinder, it is possible to realize a fuel cell reforming apparatus with a simple configuration without requiring a flow path that requires folding or many cylinders. it can.

  According to the present invention, the configuration of the fuel cell reforming apparatus can be simplified.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Further, for convenience of explanation, the positional relationship between the respective members will be described in correspondence with the upper, lower, left, and right sides of the drawing, but it is a relative positional relationship to the last and is not limited to this. For example, it is also possible to have an aspect that is upside down.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a fuel cell reforming apparatus 10 according to a first embodiment. The fuel cell reformer 10 generates a hydrogen-rich reformed gas by steam reforming methane, propane, butane, or the like, which is a raw fuel.

  The fuel cell reformer 10 includes a reforming unit 12 that generates reformed gas from raw fuel, a shift shifter 14 that reduces carbon monoxide contained in the reformed gas by a shift reaction, and a shift shifter 14. The selective oxidation unit 16 that selectively oxidizes and reduces carbon monoxide contained in the reformed gas that has passed through, and the reforming unit 12, the shift shift conversion unit 14, and the selective oxidation unit 16 are linearly stored in this order. A reforming reaction cylinder 18, a burner 20 as a combustion means for combusting raw fuel to generate combustion exhaust gas, and an outer periphery having a diameter larger than that of the reforming reaction cylinder 18. A cylinder 22. The periphery of the outer cylinder 22 is covered with a heat insulating material 24 except for a place where a plurality of pipes communicate with the outside.

  The burner 20 mixes and burns the air taken in from the air intake 26 and the raw fuel off-gas taken in from the fuel intake 28. When the raw fuel gas burns in the burner 20, a high-temperature combustion exhaust gas of 1200 to 1300 ° C. is generated. The burner 20 is disposed in the combustion chamber 30 formed at the end of the reforming reaction cylinder 18 on the reforming section 12 side, and is fixed to the lower portion of the outer cylinder 22. As a result, the heat of the combustion exhaust gas generated by the burner 20 can be immediately used for the reforming reaction in the reforming section 12, so that the thermal efficiency can be improved.

  Between the reforming reaction cylinder 18 and the outer cylinder 22, a heating flow path 32 through which the above-described combustion exhaust gas passes is formed in order to heat the reforming reaction cylinder 18.

  The reforming unit 12 is made of a case 34 having a smaller outer diameter than the reforming reaction tube 18 provided at the bottom of the reforming reaction tube 18, and metal particles such as nickel and ruthenium housed under the case 34 are made of alumina. And a catalyst layer 36 containing a reforming catalyst supported on the catalyst. On the upper surface of the case 34, an opening 38 is formed through which raw fuel and water vapor are mixed. The case 34 is provided with a vent on the side surface so that the reformed gas can pass from the side surface of the catalyst layer 36.

  The raw fuel is supplied to the catalyst layer 36 of the reforming unit 12 from the outside of the fuel cell reforming apparatus 10 via the raw fuel supply path 40 that penetrates the reforming reaction cylinder 18, the outer cylinder 22, and the heat insulating material 24. Is done. At this time, the raw fuel is heated by the fuel exhaust gas flowing through the heating flow path 32 or the reformed gas inside the reforming reaction cylinder 18 and the temperature of the reformed gas is lowered.

  Further, the steam necessary for the reforming reaction in the reforming unit 12 is generated from the reformed water supplied from the outside of the fuel cell reforming apparatus 10 via the steam supply path 42. The reformed water, which is a liquid supplied from the outside, is vaporized by the combustion exhaust gas or the reformed gas whose temperature is raised inside the reforming reaction cylinder 18 and is supplied to the catalyst layer 36 as water vapor, and the shift shift section. 14 and the temperature of the selective oxidation unit 16 are lowered.

  In the reformer 10 for a fuel cell according to the present embodiment, the raw fuel supply path 40 joins at the steam supply path 42 and the junction 44 on the downstream side of the location where water passing through the steam supply path 42 is vaporized. doing. The steam supply path 42 has a coil shape in which a part of the steam supply path 42 is spirally wound inside the outer cylinder 22 and the reforming reaction cylinder 18, and water is easily vaporized by increasing the surface area. Therefore, water vapor is generated at least at the lower end of the coil on the upstream side of the junction 44.

  As in the fuel cell reforming apparatus 10 according to the present embodiment, after the temperature rise of the raw fuel and the vaporization of water by heating of the combustion exhaust gas are performed in the separate raw fuel supply path 40 and the water vapor supply path 42. By combining the raw fuel and water vapor, it becomes easy to control the supply of water vapor by raising the temperature of the raw fuel and vaporizing water in each supply channel.

  The shift shifter 14 includes, for example, a catalyst layer 46 made of copper oxide or zinc oxide pellets, and a partition plate 48 that supports the catalyst layer 46 and has holes formed so that the reformed gas permeates from below to above. And have. The shift shifter 14 can reduce carbon monoxide by a shift reaction using water vapor contained in the reformed gas by the action of the catalyst layer 46.

  For example, the selective oxidation unit 16 has a catalyst layer 50 made of a carbon monoxide selective oxidation catalyst supported by alumina, and a hole formed so as to support the catalyst layer 50 and allow the reformed gas to permeate from below to above. And a partition plate 52. In the selective oxidation unit 16, the concentration of carbon monoxide is further reduced by oxidizing the carbon monoxide with oxygen by the action of the catalyst layer 50 to carbon dioxide.

  An air supply path 54 that communicates with the outside of the fuel cell reforming apparatus 10 to supply oxygen consumed by the selective oxidation unit 16 to a region between the shift shift unit 14 and the selective oxidation unit 16. The distal end portion 56 is disposed. As a result, the air flowing from the tip 56 rises together with the reformed gas from which carbon monoxide has been reduced in the shift shift unit 14 and contributes to the reaction in the selective oxidation unit 16.

  An opening 58 is formed on the upper surface of the reforming reaction cylinder 18 above the selective oxidation unit 16. Connected to the opening 58 is a reformed gas delivery pipe 60 for delivering a reformed gas with sufficiently reduced carbon monoxide to the fuel electrode of a fuel cell (not shown).

  Next, the operation of the fuel cell reforming apparatus 10 according to the present embodiment will be described. The combustion exhaust gas generated by the burner 20 heats the reforming reaction cylinder 18 from the side while ascending the heating channel 32 after heating the lower surface of the reforming reaction cylinder 18. At this time, the catalyst layer 36 is heated through the reforming reaction cylinder 18 to a temperature necessary for the reforming reaction, for example, in the range of 600 to 700 ° C. Further, the water vapor supply path 42 is heated directly or indirectly by the fuel exhaust gas via the reforming reaction cylinder 18, and the reformed water passing through the inside is vaporized. On the other hand, the fuel exhaust gas is cooled by the water vapor supply passage 42 as the heating passage 32 is raised, and the temperature gradually decreases. The combustion exhaust gas that has passed through the heating flow path 32 is discharged to the outside from a discharge port 62 formed in the upper portion of the outer cylinder 22.

  The water vapor evaporated in the water vapor supply path 42 and the raw fuel heated in the raw fuel supply path 40 are mixed in the junction 44 and sent out downward in the case 34. The raw fuel gas containing water vapor is gradually heated by the heat of the combustion exhaust gas when passing through the inside of the catalyst layer 36, and changes to a hydrogen-rich reformed gas by the reforming reaction.

  The reformed gas obtained by reforming the raw fuel gas rises inside the reforming reaction cylinder 18 by the flow of the supplied raw fuel gas and reaches the shift shift unit 14. Here, since the reforming reaction in the reforming unit 12 is an endothermic reaction, the reformed gas whose temperature has decreased due to the heat recovery of the steam supply path 42 reaches the shift shift unit 14. The shift reaction in the shift shift unit 14 is performed, for example, in the range of 200 to 300 ° C., and heat balance is achieved by the heat recovery of the water vapor supply path 42, so an appropriate temperature can be maintained without special temperature control. It is possible to maintain. As a result, the reformed gas is reduced in carbon monoxide at the shift shift section 14.

  In the case of an apparatus in which the temperature at the shift shift section 14 does not reach an appropriate temperature, the amount of raw fuel in the burner 20 is adjusted, or the number of turns of the coil of the water vapor supply path 42 near the shift shift section 14 is increased or decreased. Can be adjusted.

  The reformed gas whose carbon monoxide has been reduced in the shift shift unit 14 further rises while the flow is regulated by the flow straightening plate 64 inside the reforming reaction cylinder 18 by the flow of the supplied raw fuel gas, and the selective oxidation unit 16 is reached. At that time, the air supplied from the air supply path 54 also rises in the reforming reaction cylinder 18 and reaches the selective oxidation unit 16.

  Since the selective oxidation unit 16 is disposed in the vicinity of the inlet 66 of the water vapor supply path 42, the temperature of the reformed gas is lower than the temperature of the reformed gas in the shift shift unit 14 by cooling with the reformed water. . The selective oxidation reaction in the selective oxidation unit 16 is performed at a lower temperature than the shift reaction in the shift shift unit 14, for example, in the range of 70 to 200 ° C., and heat balance is achieved by heat recovery of the steam supply path 42. It is possible to maintain the reformed gas at an appropriate temperature without controlling the temperature. As a result, the reformed gas is further reduced in carbon monoxide in the selective oxidation unit 16.

  As described above, the fuel cell reforming apparatus 10 has a complicated shape because the reforming unit 12, the shift shift conversion unit 14, and the selective oxidation unit 16 are accommodated in one reforming reaction cylinder 18 in this order. The carbon monoxide contained in the reformed gas can be reduced without forming the flow path. Further, since the combustion exhaust gas passes through the heating flow path 32 between the reforming reaction cylinder 18 and the outer cylinder 22, heat necessary for the reforming reaction in the reforming section 12 inside the reforming reaction cylinder 18 is supplied. Therefore, no heating means such as a heater is required. Further, by forming the heating flow path 32 between the reforming reaction cylinder 18 and the outer cylinder 22, the fuel cell reforming apparatus 10 can be configured with a simple configuration without requiring a flow path that requires folding or many cylinders. Can be realized.

  In other words, the fuel cell reforming apparatus 10 according to the present embodiment is not provided with a flow path that requires folding or many cylinders, so that the cost is reduced by reducing the number of parts and simplifying the manufacturing process. The Moreover, since the heat insulation of the whole apparatus is easily securable by covering the outer peripheral part of the outer cylinder 22 with the heat insulating material 24, the process at the time of mounting | wearing with the heat insulating material 24 can be simplified.

  In addition, the heating flow path 32 is formed so that the combustion exhaust gas passes from the reforming unit 12 side toward the selective oxidation unit 16 side, so that the combustion exhaust gas is connected to the reforming reaction cylinder 18 and the steam supply path 42. The temperature gradually decreases while performing heat exchange. Therefore, the combustion exhaust gas passes through the inside of the heating channel 32 while the temperature is appropriately lowered from the reforming section having a high reaction temperature to the selective oxidation section having a low reaction temperature. Therefore, it becomes possible to form the heating flow path 32 linearly.

(Second Embodiment)
FIG. 2 is a cross-sectional view showing the configuration of the fuel cell reforming apparatus 110 according to the second embodiment. The fuel cell reforming apparatus 110 according to the present embodiment includes a steam supply path 42 through which water is vaporized by heating with combustion exhaust gas to supply steam to the reforming unit 12, and raw fuel to the reforming unit 12. And a raw fuel supply path 112 for supply. The raw fuel supply path 112 merges with the water vapor supply path 42 at a confluence section 114 on the upstream side of the location where water passing through the water vapor supply path 42 is vaporized. As a result, the temperature increase of the raw fuel and the vaporization of water by heating the combustion exhaust gas are performed together in the water vapor supply path 42, so that the raw fuel supply path can be shortened.

  Further, since the raw fuel supply path 112 merges with the steam supply path 42 in a region outside the reforming reaction cylinder 18, the raw fuel supply path 112 is connected to the steam supply path 42 inside the reforming reaction cylinder 18. There is no need to provide it separately. This facilitates the manufacture of the reforming reaction cylinder 18 and the fuel cell reforming apparatus 110 including the reforming reaction cylinder 18.

(Third embodiment)
In the fuel cell reforming apparatus according to each of the above-described embodiments, the water vapor supply path 42 passes through the reforming reaction cylinder 18 and the catalyst layer 46 of the shift shift unit 14 and the catalyst layer 50 of the selective oxidation unit 16 are provided. It is provided to penetrate. For this reason, in the portion where the water vapor supply path 42 is in direct contact with the catalyst layer 50, the catalyst temperature is lowered more than necessary, and the reaction may not be sufficiently performed. Therefore, in the present embodiment, the temperature of the catalyst layer is prevented from lowering more than necessary by devising the arrangement of the water vapor supply path.

  FIG. 3 is a cross-sectional view showing the configuration of the fuel cell reforming apparatus 210 according to the third embodiment. The fuel cell reforming apparatus 210 is significantly different from the fuel cell reforming apparatus 10 according to the first embodiment in that a water vapor supply path 142 is provided inside the heating flow path 32. With such a configuration, the catalyst layer 46 of the shift shift unit 14 and the catalyst layer 50 of the selective oxidation unit 16 are indirectly cooled by the water vapor supply path 142 via the reforming reaction cylinder 18. It is suppressed that a part of temperature falls extremely. As a result, for example, carbon monoxide does not sufficiently react in the selective oxidation unit 16 and unreacted carbon monoxide is suppressed from being sent to the fuel electrode of the fuel cell. Further, the steam supply path 142 may be provided so as to contact the reforming reaction cylinder 18. As a result, not only heat recovery from the combustion exhaust gas but also more heat of reaction in the catalyst layers 46 and 50 can be recovered, and the catalyst layers 46 and 50 can be further cooled. Further, the reformed gas inside the reforming reaction cylinder 18 can be further cooled.

(Fourth embodiment)
In the fuel cell reforming apparatus according to each of the above-described embodiments, the catalyst layer 46 of the shift shift unit 14 and the catalyst layer 50 of the selective oxidation unit 16 are both cylindrical, and thus the diameter of each catalyst layer is increased. In this case, there is a possibility that the heat removal at the central portion of the catalyst layer is not sufficiently performed. In such a case, the central portion of the catalyst layer becomes high temperature, and normal and efficient reaction becomes difficult. In particular, when the water vapor supply path 142 is disposed outside the reforming reaction cylinder 18 as in the fuel cell reforming apparatus 210 according to the third embodiment, there is a strong tendency for heat removal to be insufficient. Therefore, for example, if the temperature of the catalyst layer 50 of the selective oxidation unit 16 exceeds an appropriate temperature range, a side reaction that oxidizes hydrogen in the reformed gas may occur.

  FIG. 4 is a cross-sectional view showing a configuration of a fuel cell reforming apparatus 310 according to the fourth embodiment. In the fuel cell reformer 310, the catalyst layer 146 of the shift shift unit 14 and the catalyst layer 150 of the selective oxidation unit 16 are both formed in a ring shape. As a result, each catalyst layer has a hollow central portion that is difficult to control in an appropriate temperature range, and therefore, undesirable side reactions are suppressed.

(Fifth embodiment)
FIG. 5 is a cross-sectional view showing a configuration of a fuel cell reforming apparatus 410 according to the fifth embodiment. As described above, the catalytic reaction in the selective oxidation section needs to be performed within an appropriate temperature range. Usually, in the catalyst layer of the selective oxidation part, the reaction occurs most on the inlet side where the reformed gas flows, and therefore the temperature of the catalyst layer tends to be higher on the inlet side and lower on the outlet side. Therefore, if the temperature of the reformed gas flowing into the catalyst layer of the selective oxidation unit is too high, the reaction temperature in the vicinity of the inlet of the catalyst layer may become higher than the appropriate temperature range.

  In view of this, in the fuel cell reforming apparatus 410, the selective oxidation unit 116 has a folded flow path 118 and a ring-shaped catalyst layer 250 provided in the middle of the folded flow path 118. The return flow path 118 passes through the first flow path 120 and the first flow path 120 in which the reformed gas that has passed through the shift shift section 14 travels along the inner surface of the reforming reaction cylinder 18 toward the combustion chamber 30 side. The reformed gas comprises a second flow path 122 folded inward so that the reformed gas is directed to the combustion chamber 30 side. Further, the catalyst layer 250 is provided in the second flow path 122.

  Thus, before the reformed gas reaches the inlet side of the catalyst layer 250, heat is taken away by the low-temperature reformed water flowing through the steam supply path 142 disposed on the outer periphery of the first channel 120. Therefore, the reaction temperature on the inlet side of the catalyst layer 250 can be reduced to an appropriate temperature range. Further, the water vapor supply path 142 may be provided so as to contact the first flow path 120. Thereby, the temperature of the reformed gas flowing into the inlet side of the catalyst layer 250 can be further reduced.

  In addition, since the first flow path 120 and the second flow path 122 are arranged side by side, the reaction heat in the catalyst layer 250 can be recovered via the reformed gas. Further, since the reformed gas flows through the catalyst layer 250 toward the combustion chamber 30 in the second flow path, the reformed gas that flows into the first flow path 120 even when the reaction heat on the outlet side of the catalyst layer 250 is small. Thus, a decrease in temperature can be suppressed. As a result, a decrease in the reaction temperature on the outlet side that tends to be lower than the reaction temperature on the inlet side in the catalyst layer 250 is suppressed, and the entire catalyst layer 250 is maintained in a temperature range appropriate for the catalyst reaction.

  Here, the reaction temperature of the catalyst layer 250 is good to be maintained in the range of 100-200 degreeC. Preferably, it is good to maintain in the range of 120-180 degreeC. More preferably, it is good to maintain in the range of 130-170 degreeC. In the region where the temperature is too low, the reaction becomes insufficient. In addition, an unnecessary side reaction is preceded in a region where the temperature is too high.

  Note that, by providing the folded flow path 118 as in the present embodiment, the inlet side of the catalyst layer 250 of the selective oxidation unit 16 can be disposed on the side away from the shift shift unit 14 of the selective oxidation unit 16. It becomes. Therefore, even if the distance between the shift shift converter 14 and the selective oxidation section 16 is not increased, in other words, the reforming that has substantially passed through the shift shift converter 14 without extending the longitudinal direction of the reforming reaction cylinder 18. Since the distance until the gas reaches the catalyst layer 250 of the selective oxidation unit 16 becomes long, the temperature of the reformed gas reaching the inlet side of the catalyst layer 250 can be lowered. As a result, the longitudinal direction of the fuel cell reformer 410 can be made compact.

  The present invention has been described with reference to each of the above-described embodiments. However, this is an exemplification, and the present invention is not limited to each of the above-described embodiments, and the configuration of each embodiment is appropriately set. Combinations and substitutions are also included in the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and the embodiments to which such modifications are added are also included in the scope of the present invention. sell.

  In the fuel cell reforming apparatus described above, in the heat exchange section between gas and water, in order to promote heat transfer on the gas side, an object that increases heat transfer by diffusion of alumina balls, McMahon packing, etc. in the gas side passage. It may be filled. For example, a heat exchange unit for combustion exhaust gas between the reforming unit 12 and the shift conversion unit 14, between the shift conversion unit 14 and the selective oxidation unit 16, an upper portion of the selective oxidation unit 16, and an inlet side of the steam supply path 42. , Etc. may be filled with a heat transfer promoting substance.

  The raw fuel used in the above-described fuel cell reforming apparatus is not limited to the exemplified methane, propane, butane and the like. For example, natural gas, hydrocarbons such as LPG mainly composed of propane / butane, naphtha and kerosene, alcohols such as methanol and ethanol, ethers such as dimethyl ether, and the like may be used as the raw fuel.

It is sectional drawing which shows the structure of the reformer for fuel cells which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the reformer for fuel cells which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the reformer for fuel cells which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the reformer for fuel cells which concerns on 4th Embodiment. It is sectional drawing which shows the structure of the reformer for fuel cells which concerns on 5th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel cell reformer, 12 reformer, 14 shift shifter, 16 selective oxidation unit, 18 reforming reaction cylinder, 20 burner, 22 outer cylinder, 30 combustion chamber, 32 heating flow path, 40 raw fuel supply path , 42 water vapor supply path, 44 merging section, 110 fuel cell reformer, 112 raw fuel supply path, 114 merging section.

Claims (9)

A reformer for a fuel cell that reforms raw fuel into hydrogen-rich reformed gas,
A reforming section for generating reformed gas from raw fuel;
A shift shifter that reduces carbon monoxide contained in the reformed gas by a shift reaction;
A selective oxidation unit that selectively oxidizes and reduces carbon monoxide contained in the reformed gas that has passed through the shift transformation unit;
A reforming reaction cylinder for linearly storing the reforming section, the shift shift section, and the selective oxidation section in this order;
Combustion means for combusting raw fuel to produce combustion exhaust gas;
Wherein arranged on the outer periphery of the reforming reaction tube, with diameters from reforming reaction tube is rather large, an outer cylinder covering the entire side of the reforming reaction tube, a,
Between the reforming reaction cylinder and the outer cylinder, a heating passage through which the combustion exhaust gas passes to heat the reforming reaction cylinder is formed ,
The reformer for a fuel cell , wherein the heating flow path is formed so that the combustion exhaust gas passes from the reforming unit side toward the selective oxidation unit side .   2. The reformer for a fuel cell according to claim 1, wherein the combustion means is disposed in a combustion chamber formed at an end portion of the reforming reaction cylinder on the reforming portion side. A water vapor supply path through which water is vaporized by heating with the flue gas to supply water vapor to the reforming section;
A raw fuel supply path in which the raw fuel is heated by heating with the combustion exhaust gas in order to supply the heated raw fuel to the reforming unit,
3. The fuel cell according to claim 1, wherein the raw fuel supply passage joins the water vapor supply passage downstream of a location where water passing through the water vapor supply passage is vaporized. 4. Reformer. A water vapor supply path through which water is vaporized by heating with the flue gas to supply water vapor to the reforming section;
A raw fuel supply path for supplying raw fuel to the reforming section,
3. The fuel cell according to claim 1, wherein the raw fuel supply path is joined upstream of the water vapor supply path and a location where water passing through the water vapor supply path is vaporized. 4. Reformer. 5. The reformer for a fuel cell according to claim 4 , wherein the raw fuel supply path joins the water vapor supply path in a region outside the reforming reaction cylinder. The reformer for a fuel cell according to any one of claims 3 to 5 , wherein the water vapor supply path is provided inside the heating flow path. The reformer for a fuel cell according to claim 6 , wherein the water vapor supply path is provided so as to contact the reforming reaction cylinder. The selective oxidation unit is
A first flow path in which the reformed gas that has passed through the shift shift section travels along the inner surface of the reforming reaction tube toward the side opposite to the combustion chamber side, and the reformed gas that has passed through the first flow path is on the combustion chamber side A folded flow path including a second flow path folded inwardly toward
A catalyst layer provided in the second flow path;
The fuel cell reformer according to any one of claims 3 to 7 , wherein The reformer for a fuel cell according to claim 8 , wherein the water vapor supply path is provided so as to be in contact with the first flow path.

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