JP5423141B2 - Hydrogen generator - Google Patents

Description

  The present invention relates to a hydrogen generation apparatus including a carbon monoxide reduction unit that generates a hydrogen-containing gas by a reforming reaction between a raw material and water and reduces carbon monoxide in the hydrogen-containing gas.

  Fuel cells that enable highly efficient power generation even with small devices are being developed as power generation systems for distributed energy sources. Hydrogen gas or hydrogen-containing gas used as fuel during power generation has not been developed as a general infrastructure. For this reason, for example, a hydrogen generator that uses raw materials supplied from existing fossil raw material infrastructures such as city gas and propane gas and generates a hydrogen-containing gas by a reforming reaction between these raw materials and water is provided.

  The hydrogen generator includes a reforming unit that causes a reforming reaction between a raw material and water to generate a hydrogen-containing gas. In addition, a configuration is provided in which a carbon monoxide reduction unit that reduces carbon monoxide in the hydrogen-containing gas, a shift unit that performs a water gas shift reaction between carbon monoxide and water vapor, and a selective oxidation unit that oxidizes carbon monoxide. There are many cases. In these reaction parts, a catalyst suitable for each reaction, for example, a Ru catalyst or Ni catalyst is used in the reforming part, a Cu-Zn catalyst is used in the shift part, and a Ru catalyst is used in the selective oxidation part. Each reaction section has a suitable temperature, and the reforming section is often used at about 650 ° C., the modification section is about 200 ° C., and the selective oxidation section is used at about 150 ° C.

  When a fuel cell power generation system is used for home use, it is desirable to correspond to the power load of the home, and to support start / stop operation that stops the system at night when the load is small, and a desirable operation method for obtaining high energy efficiency Become.

  The hydrogen generator also needs to correspond to the operation method, and in order to supply the hydrogen-containing gas quickly at the time of startup, the reforming catalyst and the carbon monoxide reduction catalyst are heated to temperatures that can be activated at the time of startup. There is a need.

  Therefore, a configuration in which a heater for heating the shift catalyst is provided on the outer wall of the shift section, which is a carbon monoxide reduction section, and a heat insulating material is provided so as to cover the entire shift section so as to be in contact with the heater. (For example, refer to Patent Document 1).

JP 2006-225223 A

In the conventional configuration as described in Patent Document 1, the heat generated by the heater is transmitted to the carbon monoxide reduction catalyst by heat conduction through the outer wall of the shift portion. That is, the carbon monoxide reduction catalyst in the vicinity of the outer wall surface where the heater is installed is configured to be easily heated. However, the temperature rise of the carbon monoxide reducing catalyst in the vicinity of the outer wall surface where the heater is not installed is delayed. Therefore, the predetermined carbon monoxide reduction effect cannot be obtained until the entire carbon monoxide reduction catalyst is heated to the activation temperature, and it is desired to further shorten the startup time.

  This invention solves the said conventional subject, and it aims at providing the hydrogen generator which heats a carbon monoxide reduction part rapidly to activation temperature.

In order to solve the above-described problem, the hydrogen generator of the present invention includes a raw material supply path, a water supply path, a raw material supplied from the raw material supply path, and a reforming reaction of water supplied from the water supply path. A reforming unit that generates a hydrogen-containing gas, a heating unit that supplies heat necessary for the reforming reaction to the reforming unit, a carbon monoxide reduction unit that reduces carbon monoxide in the hydrogen-containing gas, and a reforming unit A reforming heat insulating portion provided outside the carbon monoxide reducing portion and a carbon monoxide reducing heat insulating portion provided outside the carbon monoxide reducing portion , and a space between the outer wall of the carbon monoxide reducing portion and the carbon monoxide reducing heat insulating portion. The air convection layer in which air flows from the bottom to the top in the direction of gravity is formed by the air intake and the air intake to the space, and the carbon monoxide reduction portion is formed by heat carried by the hydrogen-containing gas. Heated from the lower side of the gravity direction upstream Upstream of the heat of carbon monoxide reduction unit is of being transmitted to the downstream of the carbon monoxide reduction portion from the outer wall side by the air flow of the air convection.

In the hydrogen generator of the present invention, the carbon monoxide reduction unit is heated from the lower side in the gravity direction upstream by the heat carried by the hydrogen-containing gas, but the heat upstream of the carbon monoxide reduction unit is heated in the air convection layer. The carbon monoxide reduction is stored in the carbon monoxide reduction section because it is transmitted from the outer wall side to the downstream side of the carbon monoxide reduction section by the air flow of the air and can effectively heat the entire carbon monoxide reduction section. The time for heating the catalyst to the activation temperature can be shortened. As a result, it is possible to reduce the energy consumption required at startup. Further, since the entire carbon monoxide reducing catalyst can be effectively used, the amount of the catalyst can be reduced.

Schematic configuration diagram of a hydrogen generator 100 according to Embodiment 1 of the present invention Overview of transformation heater 27 in Embodiment 1 of the present invention Overview of a modification of the shift heater 27 in the first embodiment of the present invention Schematic configuration diagram of a hydrogen generator 101 according to Embodiment 2 of the present invention Schematic configuration diagram of hydrogen generator 102 in Embodiment 3 of the present invention Schematic configuration diagram of hydrogen generator 103 in Embodiment 4 of the present invention

According to a first aspect of the present invention, there is provided a raw material supply path, a water supply path, a reforming unit that generates a hydrogen-containing gas by a reforming reaction between a raw material supplied from the raw material supply path and water supplied from the water supply path. A heating unit that supplies heat necessary for the reforming reaction to the reforming unit, a carbon monoxide reducing unit that reduces carbon monoxide in the hydrogen-containing gas, and a reforming heat insulating unit provided outside the reforming unit, And a carbon monoxide reduction heat insulation part provided outside the carbon monoxide reduction part , and a space is provided between the outer wall of the carbon monoxide reduction part and the carbon monoxide reduction heat insulation part . An air convection layer in which air flows from the bottom to the top in the direction of gravity is formed by the air inlet and the air outlet , and the carbon monoxide reduction section is heated from the lower side in the direction of gravity upstream by the heat carried by the hydrogen-containing gas. However, the heat upstream of the carbon monoxide reduction unit A hydrogen generator delivered downstream of the carbon monoxide reduction portion from the outer wall side by the air flow of the layer. More this, the carbon monoxide reducing unit, but is heated from the lower side in the gravity direction on the upstream by the heat carried by the hydrogen-containing gas flow upstream of the heat of carbon monoxide reduction portion of the air in the air convection layer Is transmitted from the outer wall side to the downstream side of the carbon monoxide reduction unit, and the entire carbon monoxide reduction unit can be effectively heated. Therefore, the carbon monoxide reduction catalyst contained in the carbon monoxide reduction unit is activated. The time for heating to the temperature can be shortened. As a result, it is possible to reduce the energy consumption required at startup. Further, since the entire carbon monoxide reducing catalyst can be effectively used, the amount of the catalyst can be reduced .

In the second invention, in particular, in the first invention, since the air inlet and the air outlet are provided in the carbon monoxide reduction heat insulating portion, the air flow is positively generated in the air convection layer. The carbon monoxide reducing portion can be heated by the air flow.

In the third aspect of the invention, in particular, in the invention of the first or 2, a heater for heating the carbon monoxide reduction portion, in proximity to the outer wall of the carbon monoxide reducing unit, provided in an air convection, the air convection layer by the flow of air flowing through the heater of the heat, Runode transmitted across the carbon monoxide reducing unit, by the flow of air flowing through the air convection heater of heat, it can be transmitted to the whole carbon monoxide reducing unit It becomes.

In the fourth aspect of the invention, particularly in the third aspect of the invention, the air intake is provided on the lower side in the gravitational direction than the heater installation position, so that air flow (natural convection) is positively generated in the air convection layer. The heat of the heater can be transmitted to the entire carbon monoxide reduction unit.

  In the fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the carbon monoxide reduction unit is provided on the upper side in the gravity direction of the reforming unit with the same outer wall, and is modified to the outside of the outer wall. The heat of the reforming part, which becomes a high temperature state compared with the carbon monoxide reduction part, is heated by the carbon monoxide reduction part. Can be used effectively.

  In the sixth aspect of the invention, in particular, in the fifth aspect of the invention, since the raw material supply path or the water supply path is provided at the air outlet, the heat generated by the air discharged from the air convection layer is converted into the reformer. Since heat exchange can be performed with the raw material or water supplied to the heat dissipation loss, heat dissipation loss can be reduced.

  In the seventh invention, in particular, in any one of the first to sixth inventions, a spacer for securing a space is provided between the carbon monoxide reducing portion and the carbon monoxide reducing heat insulating portion. The air convection layer that generates the air flow can be reliably configured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing a cross-section of the main part of a hydrogen generator 100 according to the first embodiment of the present invention.

  In FIG. 1, the hydrogen generator 100 includes a water vapor generating unit 23 that evaporates water supplied from the water supply path 3 and preheats a mixed gas of raw material and water vapor. In addition, a steam reforming unit 20 that promotes a reforming reaction between the raw material supplied from the raw material supply path 4 and steam, and carbon monoxide and steam in the hydrogen-containing gas generated in the steam reforming unit 20 are transformed. There is a shift section 25 that reacts to reduce the carbon monoxide concentration of the hydrogen-containing gas. Further, the carbon monoxide remaining in the hydrogen-containing gas after passing through the shift conversion section 25 is mainly oxidized using air supplied from the air supply section 19 to the hydrogen-containing gas after passing through the shift conversion section 25. The selective oxidation unit 26 is removed. The metamorphic unit 25 and the selective oxidation unit 26 constitute a carbon monoxide reduction unit.

  The steam reforming section 20 is provided with a Ru-based reforming catalyst, the shift section 25 is provided with a Cu—Zn-based shift catalyst, and the selective oxidation section 26 is provided with a Ru-based selective oxidation catalyst. Further, the temperature of the reforming temperature detection unit 21 for detecting the temperature (reaction temperature) of the reforming catalyst (or hydrogen-containing gas) in the steam reforming unit 20 and the temperature of the shift catalyst (or mixed gas of raw material and steam) in the shift unit 25. Is provided with a metamorphic temperature section 24 for detecting.

  In addition, the hydrogen generator 100 includes a combustion unit 2 that serves as a heating unit for supplying reaction heat necessary for the reforming reaction in the steam reforming unit 20. The combustion unit 2 is a burner that burns combustion gas that serves as a heating source, a combustion detection unit 22 that is a flame rod that detects the combustion state of the combustion unit 2, and combustion air that supplies fuel air to the combustion unit 2 It has the combustion fan 18 used as a supply part. Combustion gas burned in the combustion unit 2 is supplied to the combustion unit 2 via a combustion gas supply path (not shown). The hydrogen-containing gas generated by the hydrogen generator 100 is supplied to a fuel cell or the like installed outside via the hydrogen gas supply path 12. The flame rod is a device that applies a voltage to ions generated when a flame is formed and measures the value of the ionic current that flows at that time. Further, the steam reforming unit 20 and the steam generating unit 23 are configured to be supplied from the combustion exhaust gas generated by the combustion unit 2 through the wall surface of the hydrogen generator 100 with the combustion unit 2. Further, the combustion exhaust gas is exhausted to the outside of the hydrogen generator 100 from the upper right outlet of the drawing.

A water supply unit is connected to the water supply path 3. A raw material supply unit is connected to the raw material supply path 4. The raw material supplied from the raw material supply path 4 may be a raw material containing an organic compound composed of at least carbon and hydrogen elements such as hydrocarbons, for example, city gas mainly composed of methane, natural gas, LPG, etc. is there. Here, a gas infrastructure line 6 of city gas is used as a raw material supply source, and a desulfurization section for removing sulfur compounds, which are odorous components in the raw material, is connected to the gas infrastructure line 6. For example, the desulfurization part can use a zeolite-based adsorption / removal agent that adsorbs a sulfur compound, which is an odorous component in city gas. The water supply unit and the raw material supply unit 4 can use a booster pump, and have a function of adjusting the flow rate of the supplied water and the flow rate of the raw material, for example, by controlling the input current pulse, input power, and the like. (Details not shown).

  The hydrogen generator 100 is provided with a reforming heat insulating unit 30 so as to be in close contact with the outer outer wall surface of the steam reforming unit 20. In addition, the carbon monoxide reducing unit that is the metamorphic unit 25 and the selective oxidation unit 26 is provided with a gap between the outer wall surface and a carbon monoxide removing heat insulating unit 31. A space formed by a gap between the outer wall surface and the carbon monoxide removal heat insulating portion 31 is an air convection layer 29. In addition, the modified heat insulation part 30 and the carbon monoxide removal heat insulation part 31 of this Embodiment 1 are comprised with the shaping | molding molded heat insulating material using the ceramic fiber raw cotton and the binder.

  Further, a transformation heater 27 and a selective oxidation heater 28 are provided in close contact with the outer walls of the transformation portion 25 and the selective oxidation portion 26 of the air convection layer 29. FIG. 2 shows an overview of the transformation heater 27. The shift heater 27 is a sheathed heater and has a shape that matches the shape of the outer wall of the hydrogen generator 100. Moreover, it is good also as a shape of a heater as shown in FIG. Further, since the selective oxidation heater 28 has the same configuration as the shift heater 27, description thereof is omitted.

  In addition, the carbon monoxide removal heat insulating portion 31 is provided with an air inlet 32 on the lower side (lower side in the gravity direction) of the transformation heater 27 in order to take air into the air convection layer 29. In addition, an air outlet 33 for discharging air from the air convection layer 29 is provided. The air outlet 33 is configured by providing a gap between the carbon monoxide removal heat insulating portion 31, the water supply path 3, and the raw material supply path 4.

<Operation of Hydrogen Generator 100>
Next, the start-up operation, the normal operation operation, and the stop operation of the hydrogen generator 100 will be described focusing on the operation of the hydrogen generator 100.

When the hydrogen generator 100 is started from the stopped state, a hydrogen generator bypass path (not shown) is passed from the raw material supply unit 4 according to a command from an operation control unit (not shown), and a sealing unit (not shown ). ) Through a fuel cell bypass path (not shown) , the raw material is supplied to the combustion unit 2, and the combustion unit 2 ignites the raw material to start heating the hydrogen generator 100.

This operation both by energizing the transformer heater 27 and the selective oxidation heater 28, based on the temperature detected by the shift temperature detection section 24 performs heating of the shift converter 25 and the selective oxidation unit 26. In addition, the heating operation of the carbon monoxide removing unit may be performed prior to the ignition operation of the combustion unit 2.

After starting the heating in the combustion unit 2, the raw material is supplied to the hydrogen generator 100 (steam reforming unit 20) through the raw material supply path 4, and the water is supplied from the water supply path 3 to the hydrogen generator 100. And start the reforming reaction. In the present embodiment, city gas (13A) containing methane as a main component is used as a raw material. The amount of water supplied from the water supply unit 3 is controlled so that water vapor is about 3 moles per 1 mole of carbon atoms in the average molecular formula of the city gas (steam carbon ratio (S / C) is 3). degree).

  In the hydrogen generator 100, a steam reforming reaction is performed in the steam reforming unit 20, a shift reaction is performed in the shift unit 24, and a selective oxidation reaction of carbon monoxide is performed in the selective oxidation unit 26. The produced hydrogen-containing gas passes through the fuel cell bypass path 13 to the combustion unit 2 through the sealing unit 9 until the carbon monoxide concentration can be reduced to a predetermined concentration (in this embodiment, 20 ppm or less on a dry gas basis). Supplied. At this time, based on the temperature detected by the reforming temperature detector 21, the combustion of the combustion section 2 is performed so that the steam reforming section 20, the shift section 24, and the selective oxidation section 26 have temperatures suitable for each reaction. Control.

  After the transformation unit 24 and the selective oxidation unit 26 reach an appropriate temperature for the reaction and the carbon monoxide concentration is reduced to a predetermined concentration, the sealing unit 9 is operated, and the hydrogen-containing gas is supplied through the hydrogen gas supply path 12, for example, Then, supply to the fuel cell or the like is started.

  When the apparatus is stopped, the supply of raw materials and water is stopped, and the temperatures of the catalyst layers of the steam reforming unit 20, the shift unit 25, and the selective oxidation unit 26 in the fuel reformer 1 are lowered. At this time, the basic operation of the combustion unit 2 is stopped. After the temperature of each catalyst layer is lowered to the set temperature, the raw material is circulated through the fuel reformer 1, and the operation of replacing the hydrogen-containing gas staying in the gas path of the fuel reformer 1 with the raw material is performed, and the fuel is appropriately selected. An operation of sealing the reformer 1 is performed.

<Characteristics of configuration of hydrogen generator 100>
(1) In the hydrogen generator 100 according to the first embodiment, the air convection layer 29 is formed between the carbon monoxide reduction unit and the carbon monoxide reduction heat insulation unit 31 to reduce carbon monoxide particularly at the time of startup. The whole part can be heated quickly, and the carbon monoxide reducing catalyst contained in the carbon monoxide reducing part is uniformly heated. By providing the air convection layer 29, an air flow is generated in the air convection layer 29. The metamorphic unit 25 serving as the carbon monoxide removing unit is heated from the upstream by the heat carried by the hydrogen-containing gas after the steam reforming unit 20, but the upstream heat is also downstream from the outer wall side by the flow of air. Will be communicated. That is, the entire carbon monoxide reduction unit can be heated by the air flow, and the carbon monoxide reduction catalyst accommodated in the carbon monoxide reduction unit can be heated uniformly.

  (2) Since the air inlet 32 and the air outlet 33 to the air convection layer 29 are provided in the carbon monoxide reduced heat insulating portion, the air convection layer positively generates an air flow. The carbon monoxide reducing portion can be heated by the air flow.

  (3) Since the transformation heater 27 and the selective oxidation heater 28 for heating the carbon monoxide reduction unit are provided in the air convection layer 29 in the vicinity of the outer wall of the carbon monoxide reduction unit, the air convection layer 29 It is also possible to transfer the heat of the heater to the entire carbon monoxide reduction unit by the flow of air flowing through the.

  (4) In addition, by providing the air intake 32 on the lower side in the gravitational direction than the installation position of the transformation heater 27, an air flow can be actively generated in the air convection layer 29. This heat can be transferred to the entire carbon monoxide reduction unit.

  (5) Moreover, the carbon monoxide reduction part is provided in the gravity direction upper side of the steam reforming part 20 with the same outer wall, and the reforming heat insulation part 30 and the carbon monoxide reduction heat insulation part 31 are outside the outer wall. By being provided in, it becomes the structure which can use effectively the heat | fever of the steam reforming part 20 used as a high temperature state compared with a carbon monoxide reduction part for the heating of a carbon monoxide reduction part.

(6) Since the raw material supply path 4 and the water supply path 3 are provided at the air outlet 33, the heat generated by the air discharged from the air convection layer 29 is supplied to the hydrogen generator 100. Heat exchange with the raw material or water makes it possible to reduce heat dissipation loss.

  The configurations shown in (1) to (6) above are all preferable configurations. However, the carbon monoxide reduction section can be quickly provided even when at least the air convection layer 29 is provided and the respective configurations are individually combined. In addition, the hydrogen generator 100 that heats to the active temperature can be provided.

  Depending on the concentration required for carbon monoxide in the hydrogen-containing gas produced by the fuel reformer 100 (when allowed at a high concentration), the selective oxidation unit 26 is not necessarily an essential component of the fuel reformer 1. Do not need to. As a specific example, there is a case where the fuel reformer 1 that does not have the selective oxidation unit 26 is used by being connected to a solid polymer type fuel cell or a phosphoric acid type having high CO resistance.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.

  In FIG. 4, the principal part cross section of the hydrogen generator 101 in the 2nd Embodiment of this invention is shown.

  In FIG. 4, the hydrogen generation apparatus 101 has substantially the same configuration as the hydrogen generation apparatus 100 of Embodiment 1, and performs substantially the same operation. The difference is that the selective oxidation heater 28 is eliminated from the heating configuration of the carbon monoxide reduction unit (the transformation unit 25 and the selective oxidation unit 26). Therefore, at the time of start-up, the carbon monoxide reduction unit is heated using the transformation heater 27.

  Compared with the hydrogen generator 100 of the first embodiment in which the selective oxidization heater 28 is also provided in the air convection layer 29, the heatability of the carbon monoxide reduction unit at the start-up of the apparatus is deteriorated. However, since the heat of the shift heater 27 can be transferred to the entire carbon monoxide reduction portion by the air flow flowing through the air convection layer 29, compared with a configuration in which the air convection layer 29 is not provided, An effect of uniformly heating the carbon monoxide reducing catalyst housed in the carbon oxide reducing portion can be obtained.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.

  In FIG. 5, the principal part cross section of the hydrogen generator 102 in the 3rd Embodiment of this invention is shown.

  In FIG. 5, the hydrogen generation apparatus 102 has substantially the same configuration as the hydrogen generation apparatus 100 of Embodiment 1, and performs substantially the same operation. The difference is that a space is provided between the steam reforming unit 20 and the reforming heat insulating unit 30, and an air convection layer 29 is also formed in the space, and the air intake unit 32 is used as the reforming heat insulating unit 30. It is the point which provided the spacer for ensuring the air convection layer 29 in the bottom part of the reforming heat insulation part 30, and the spacer for ensuring the air convection layer 29 of a carbon monoxide removal part. In addition, the air convection layer 29 provided between the carbon monoxide reduction part and the carbon monoxide reduction heat insulation part 31 communicates.

  The air convection layer 29 is configured across the steam reforming unit 20 and the carbon monoxide removal unit, and the air intake unit 32 is provided in the reforming heat insulating unit 30 so that the temperature becomes higher than that of the carbon monoxide reduction unit. The heat of the steam reforming unit 20 can be effectively used for heating the carbon monoxide reduction unit.

In addition, by providing a spacer for securing a space between the reforming heat insulating unit 30 and the carbon monoxide reduced heat insulating unit 31, the air convection layer 29 that generates an air flow can be reliably ensured. . In addition, when the heat insulating portions of the modified heat insulating portion 30 and the carbon monoxide reduced heat insulating portion 31 are made of a material having low thermal conductivity such as a microporous heat insulating material (for example, trade name WDS, Myurotherm), An air convection layer 29 can be formed.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.

  In FIG. 6, the principal part cross section of the hydrogen generator 103 in the 4th Embodiment of this invention is shown.

  In FIG. 6, the hydrogen generator 103 has substantially the same configuration as the hydrogen generator 100 of Embodiment 1, and performs substantially the same operation. The difference is that the shift heater 27 and the selective oxidation heater 28 are eliminated. Compared with the hydrogen generator 103 of Embodiment 3, the heating property of the carbon monoxide reduction unit at the time of starting the apparatus becomes worse. However, since the heat of the steam reforming unit 20 can be transferred to the entire carbon monoxide reduction unit by the flow of air flowing through the air convection layer 29, compared with a configuration in which the air convection layer 29 is not provided. In addition, it is possible to obtain an effect of heating the carbon monoxide reducing catalyst by effectively using the heat of the steam reforming unit 20.

  The present invention is useful for a hydrogen generator having a carbon monoxide reduction unit that reduces carbon monoxide in a hydrogen-containing gas.

DESCRIPTION OF SYMBOLS 2 Combustion part 3 Water supply path 4 Raw material supply path 18 Combustion air supply part 19 Air supply part 20 Steam reforming part 21 Reforming temperature detection part 22 Frame rod 23 Steam generation part 24 Metamorphic temperature detection part 25 Metamorphic part 26 Selective oxidation part 26 27 Transformation heater 28 Selective oxidation heater 29 Air convection layer 30 Reforming heat insulation part 31 Carbon monoxide removal heat insulation part 32 Air intake 33 Air intake 34 Spacer 100, 101, 102, 103 Hydrogen generator

Claims (7)

A reforming unit that generates a hydrogen-containing gas by a reforming reaction of a raw material supply path, a water supply path, a raw material supplied from the raw material supply path, and water supplied from the water supply path; heating unit supplied to the reformer heat required quality react with a carbon monoxide reducing section for reducing the carbon monoxide in the hydrogen-containing gas, the reformer reforming heat insulating portion provided on the outside of And a carbon monoxide reduction heat insulation part provided outside the carbon monoxide reduction part, a space is provided between an outer wall of the carbon monoxide reduction part and the carbon monoxide reduction heat insulation part, and the space And an air inlet and an air outlet to the space constitute an air convection layer in which air flows from the bottom to the top in the direction of gravity , and the carbon monoxide reducing portion is upstream by heat carried by the hydrogen-containing gas. It is heated from below in the direction of gravity Upstream of heat the hydrogen generator delivered to downstream of the carbon monoxide reducing unit from the outer wall by the flow of the air in the air convection layer of the carbon monoxide reducing unit. The hydrogen generation apparatus according to claim 1, wherein the air intake and the air intake are provided in the carbon monoxide reduced heat insulating portion. A heater for heating the carbon monoxide reduction unit is provided in the air convection layer in the vicinity of the outer wall of the carbon monoxide reduction unit, and heat of the heater is generated by the flow of air flowing through the air convection layer. but the hydrogen generating apparatus according to claim 1 or 2 that is transmitted across the carbon monoxide reducing unit. The hydrogen generation apparatus according to claim 3 , wherein the air intake port is provided below the installation position of the heater in the direction of gravity. The heat insulation part which makes the outer wall the same, the carbon monoxide reduction part is provided in the gravity direction upper side of the reforming part, and becomes the reforming heat insulation part and the carbon monoxide reduction heat insulation part on the outside of the outer wall. The hydrogen generator according to any one of claims 1 to 4, wherein: The hydrogen generation apparatus according to claim 5, wherein the raw material supply path or the water supply path is provided at the air outlet. The hydrogen generator according to claim 1, wherein a spacer for securing the space is provided between the carbon monoxide reducing unit and the carbon monoxide reducing heat insulating unit.

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