JP2015147696A - Hydrogen generation device, and fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrogen generation device, in which the amount of a reforming catalyst to be used therein is reduced so that the cost of hydrogen is made lower.SOLUTION: A hydrogen generation device 100 includes: first and second reforming catalyst layers 1, 2 for reforming a raw material; a temperature raising layer 3 for raising the temperature of the gas flowing out of the first reforming catalyst layer 1; and a heater 4 for heating the temperature raising layer 3. The second reforming catalyst layer 2 is disposed on the downstream side of the temperature raising layer 3. Such a catalyst is packed in the second reforming catalyst layer 2 that the amount of ammonia to be generated thereby is made smaller than that of ammonia to be generated by another catalyst, which is packed in the first reforming catalyst layer 1, even when used at the temperature higher than that of the first reforming catalyst layer 1. The first reforming catalyst layer 1 and the second reforming catalyst layer 2 are used in different temperature ranges suitable for respective reforming catalysts packed therein so that performance of each of the reforming catalysts can be improved while keeping performance of the hydrogen generation device 100. As a result, the amounts of the reforming catalysts can be reduced and consequently the hydrogen generation device 100 can be designed compactly.

Description

  The present invention relates to a hydrogen generator and a fuel cell system including a reforming catalyst for reforming a raw material.

  The hydrogen generator is used, for example, to supply a hydrogen-containing gas as a fuel gas to a fuel cell. Such a hydrogen generator generally includes a reformer that generates a hydrogen-containing gas by reforming a raw material composed of a hydrocarbon such as city gas, natural gas, or LPG and water (steam). Yes.

  When the raw material supplied to the reformer contains nitrogen-containing compounds such as nitrogen molecules and amines, ammonia is generated from hydrogen and nitrogen produced by the reforming catalyst when the raw material is reformed in the reformer. The ammonia becomes a factor that poisons the fuel cell body.

  As a means for suppressing the generation of ammonia, a method using a catalyst supporting at least one of platinum and rhodium has been proposed (see, for example, Patent Document 1).

  On the other hand, if the raw material contains heavy hydrocarbons, carbon deposits on the platinum / rhodium-based reforming catalyst and the catalytic activity decreases, so the upstream of the platinum / rhodium-based reforming catalyst. A method has been proposed in which a ruthenium-based catalyst, which is considered to be resistant to carbon deposition, is disposed in the low-temperature portion, heavy hydrocarbons are converted to methane, and carbon deposition on the platinum / rhodium-based reforming catalyst is suppressed (for example, , See Patent Document 2).

JP-A-2005-147483 JP2013-137865A

  However, since the amount of reforming catalyst necessary to maintain the amount of hydrogen-containing gas discharged from the hydrogen generator is determined by the temperature distribution of the reforming catalyst layer, the reforming catalyst filling method described in Patent Document 2 There was a problem that the amount of the reforming catalyst could not be reduced and the hydrogen generator could not be designed at low cost.

  The present invention has been made to solve the above-mentioned problems, and has as its object to provide a hydrogen generator and a fuel cell system that reduce the amount of reforming catalyst while maintaining the performance of the reforming catalyst and achieve lower costs. To do.

  In order to solve the above problems, the present invention raises the temperature of a first reforming catalyst layer and a second reforming catalyst layer that reform a raw material, and a gas that has flowed out of the first reforming catalyst layer. A temperature rising layer and a heater for heating the temperature rising layer are provided in a hydrogen generator, and the second reforming catalyst layer is disposed downstream of the temperature rising layer.

With the above configuration, the gas flowing out from the first reforming catalyst layer flows into the second reforming catalyst layer while being heated by the temperature raising layer. It can be used at a low temperature and the second reforming catalyst layer can be used at a relatively high temperature.

  In the reforming catalyst filled in the first reforming catalyst layer, when a nitrogen-containing compound is contained in the raw material to be reformed, ammonia is generated from nitrogen during the reforming of the raw material, but it is used at a relatively low temperature. By using a reforming catalyst (for example, a ruthenium-based catalyst or a nickel-based catalyst) capable of suppressing the amount of ammonia produced, the reforming catalyst filled in the second reforming catalyst layer contains a nitrogen-containing compound. Using a reforming catalyst (for example, a platinum / rhodium catalyst) capable of suppressing the amount of ammonia produced even if the contained raw material is reformed at a relatively high temperature, the first reforming catalyst layer and the second By configuring the heating layer and the heater so that the reforming catalyst layer is used in a temperature range suitable for each reforming catalyst to be charged, the reforming catalyst layer is maintained while maintaining the performance of the hydrogen generator. The performance of the quality catalyst can be improved.

  Thereby, since the amount of the reforming catalyst can be reduced, the hydrogen generator can be designed in a compact manner.

  According to the hydrogen generator and the fuel cell system of the present invention, each reforming catalyst can be used at an optimum temperature, so that the amount of the reforming catalyst can be reduced while maintaining the required performance. The generator and the fuel cell system can be designed in a compact manner.

The block diagram which shows an example of a structure of the hydrogen generator which concerns on Embodiment 1 of this invention Schematic sectional view showing an example of the configuration of the hydrogen generator according to Embodiment 1 of the present invention Schematic longitudinal cross-sectional view which shows an example of a structure of the hydrogen generator based on Embodiment 1 of this invention The characteristic view which shows an example of the temperature distribution of a reforming catalyst layer in the hydrogen generator which concerns on the specific example of Embodiment 1 of this invention Schematic sectional view showing an example of the configuration of the hydrogen generator according to Embodiment 2 of the present invention FIG. 3 is a block diagram showing an example of the configuration of a fuel cell system according to Embodiment 3 of the present invention.

  The first aspect of the present invention includes a first reforming catalyst layer and a second reforming catalyst layer that reform a raw material, a temperature raising layer that raises the temperature of a gas flowing out of the first reforming catalyst layer, And a heater for heating the temperature rising layer, wherein the second reforming catalyst layer is disposed downstream of the temperature rising layer.

  With the above configuration, the gas flowing out from the first reforming catalyst layer flows into the second reforming catalyst layer while being heated by the temperature raising layer. It can be used at a low temperature and the second reforming catalyst layer can be used at a relatively high temperature.

  In the reforming catalyst filled in the first reforming catalyst layer, when a nitrogen-containing compound is contained in the raw material to be reformed, ammonia is generated from nitrogen during the reforming of the raw material, but it is used at a relatively low temperature. By using a reforming catalyst (for example, a ruthenium-based catalyst or a nickel-based catalyst) capable of suppressing the amount of ammonia produced, the reforming catalyst filled in the second reforming catalyst layer contains a nitrogen-containing compound. Using a reforming catalyst (for example, a platinum / rhodium catalyst) capable of suppressing the amount of ammonia produced even if the contained raw material is reformed at a relatively high temperature, the first reforming catalyst layer and the second By configuring the heating layer and the heater so that the reforming catalyst layer is used in a temperature range suitable for each reforming catalyst to be charged, the reforming catalyst layer is maintained while maintaining the performance of the hydrogen generator. The performance of the quality catalyst can be improved.

  Thereby, since the amount of the reforming catalyst can be reduced, the hydrogen generator can be designed in a compact manner.

  In the second aspect of the present invention, the second reforming catalyst layer in the first aspect of the present invention is filled with a catalyst that generates less ammonia than the catalyst that is packed in the first reforming catalyst layer. is there.

  Note that it is desirable that the amount of ammonia produced in the second reforming catalyst layer is smaller than the amount of ammonia in which the equipment using the hydrogen produced by the hydrogen generator deteriorates in performance due to the ammonia in the produced hydrogen gas.

  Thereby, even if the control temperature of a 2nd reforming catalyst layer becomes high, the deterioration by the ammonia of the downstream apparatus of a hydrogen generator can be suppressed. Furthermore, it is possible to suppress the performance deterioration of equipment that uses the generated hydrogen.

  Moreover, 3rd this invention fills the said temperature rising layer in 1st or 2nd this invention with the heat-transfer material which accelerates | stimulates heat transfer.

  Thereby, since the heat transfer by the heater to the gas flowing out from the first reforming catalyst layer is promoted compared to the case where the temperature rising layer is a space, the temperature rising layer can be designed more compactly. .

  According to a fourth aspect of the present invention, the heat transfer material according to the third aspect of the present invention includes at least one carrier of the first reforming catalyst layer and the second reforming catalyst layer.

  Thereby, durability confirmation becomes easy compared with the case where a new material is used as a heat transfer material.

  In the fifth aspect of the present invention, the heat transfer material in the third aspect of the present invention contains alumina.

  Thereby, the cost rise by installation of a heat-transfer material can be suppressed.

  A sixth aspect of the present invention is a fuel comprising: the hydrogen generator according to any one of the first to fifth aspects of the present invention; and a fuel cell that generates power using a hydrogen-containing gas supplied from the hydrogen generator. It is a battery system.

  As a result, the amount of the reforming catalyst can be reduced and the hydrogen generator can be designed in a compact manner, so that the fuel cell system can be designed in a more compact manner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description is omitted.

(Embodiment 1)
Hereinafter, the hydrogen generator 100 according to Embodiment 1 of the present invention will be specifically described.

  FIG. 1 is a block diagram showing an example of the configuration of the hydrogen generator according to Embodiment 1 of the present invention, and FIG. 2 is a schematic cross-sectional view showing an example of the configuration of the hydrogen generator of the embodiment.

As shown in FIGS. 1 and 2, the hydrogen generator 100 according to Embodiment 1 of the present invention includes a first reforming catalyst layer 1 and a second reforming catalyst layer 2 that reform a raw material, A temperature raising layer 3 for raising the temperature of the gas flowing out from one reforming catalyst layer 1 and a heater 4 for heating the temperature raising layer 3. The second reforming catalyst layer 2 is downstream of the temperature raising layer 3. Placed on the side.

  The first reforming catalyst layer 1 is filled with a first reforming catalyst (not shown) that reforms the raw material to generate a hydrogen-containing gas.

  Examples of the first reforming catalyst include a ruthenium-based catalyst and a nickel-based catalyst. When these materials contain nitrogen-containing compounds such as nitrogen molecules and amines, Ammonia is produced from the produced hydrogen and nitrogen by the first reforming catalyst.

  The ammonia is a factor that degrades the performance of the fuel cell 400 when the fuel cell 400 is installed in the subsequent stage of the hydrogen generator 100, so the first reforming catalyst layer 1 is filled with the first ammonia. There is an upper limit to the use temperature of the reforming catalyst. For example, in the case of a ruthenium-based catalyst, the upper limit is about 550 ° C., and when this temperature is exceeded, the amount of ammonia produced is about three times.

  The gas flowing out from the first reforming catalyst layer 1 is heated in the temperature raising layer 3, then flows into the second reforming catalyst layer 2, and the second reforming catalyst layer 2 filled with the second reforming catalyst layer 2. A hydrogen-containing gas is generated by two reforming catalysts (not shown).

  The temperature raising layer 3 is heated by the heater 4 to a temperature suitable for allowing the gas flowing out from the first reforming catalyst layer 1 to flow into the second reforming catalyst layer 2. The temperature raising layer 3 can be a space.

  The heater 4 may have any configuration as long as the heating layer 3 can be heated, such as a combustor or an electric heater.

  The second reforming catalyst is a catalyst that can suppress the generation of ammonia even if the raw material contains nitrogen-containing compounds such as nitrogen molecules and amines. In particular, the first reforming catalyst It is desirable that the catalyst be capable of suppressing ammonia production at a higher temperature (for example, 600 ° C. or higher).

  Furthermore, the amount of ammonia generated by the second reforming catalyst is desirably equal to or less than an amount that can suppress poisoning of the fuel cell 400 or the like installed downstream of the hydrogen generator 100 by ammonia. Specific examples include platinum / rhodium catalysts.

  As a result, the second reforming catalyst layer 2 can be used in a high temperature range where the reforming performance is high.

  The first reforming catalyst desirably has a function of converting heavy hydrocarbons to methane and generating a hydrogen-containing gas by a reforming reaction. Here, a heavy hydrocarbon is defined as a hydrocarbon compound containing at least two carbon atoms.

  Thereby, it is possible to suppress the occurrence of carbon precipitation due to heavy hydrocarbons in the second reforming catalyst used at a high temperature, and it is possible to suppress the generation of ammonia even if the raw material contains nitrogen.

  For example, the gas at 550 ° C. or less flowing out from the first reforming catalyst layer 1 set to 550 ° C. is heated to about 650 ° C. in the temperature raising layer 3, so that the second reforming catalyst layer 2 becomes 650 ° C. A configuration (hereinafter referred to as “configuration A”) of approximately ˜680 ° C. is possible, and a configuration in which a temperature distribution of 550 ° C. to 680 ° C. is applied to the conventional second reforming catalyst layer 2 (hereinafter referred to as configuration B). In addition, the performance of the second reforming catalyst layer 2 can be improved.

That is, in the configuration A, since the first reforming catalyst layer 1 is used at a temperature (for example, 550 ° C.) or less capable of decomposing heavy hydrocarbons while suppressing the generation of ammonia, the second reforming catalyst layer 1 is used. Only methane and reformed gas (hydrogen, carbon monoxide, carbon dioxide, etc.) flow into the catalyst layer 2.

  That is, the second reforming catalyst layer 2 can be set to a temperature with high reforming performance (for example, 650 ° C. to 680 ° C.) without considering catalyst deterioration due to carbon deposition or the like. In other words, even if the amount of the second reforming catalyst filled in the second reforming catalyst layer 2 is reduced, the same performance as that of the conventional configuration B can be ensured.

  According to this configuration, the performance of the hydrogen generator 100 can be improved by using the reforming catalyst filled in the first reforming catalyst layer 1 and the second reforming catalyst layer 2 in a temperature range more suitable for each catalyst. Since the performance of the reforming catalyst can be improved while maintaining the above, the amount of the reforming catalyst can be reduced. That is, the hydrogen generator 100 can be designed in a compact manner.

  The above-described configuration can be applied to any reforming method such as a steam reforming reaction or an autothermal reaction.

  FIG. 3 shows an example of the configuration of the hydrogen generator of Embodiment 1 more specifically.

  In the hydrogen generator 200 shown in FIG. 3, a burner 5 as a heater 4 for combusting combustion gas supplied via a combustion gas supply path (not shown) is disposed at the center. A cylindrical combustion cylinder 30 is disposed outside the burner 5. A bottomed cylindrical inner cylinder 6 having an inner cylinder bottom plate 7 is disposed outside the combustion cylinder 30. A bottomed cylindrical middle cylinder 8 having a middle cylinder bottom plate 9 is disposed outside the inner cylinder 6. A bottomed cylindrical outer cylinder having an outer cylinder bottom plate is disposed outside the middle cylinder 8.

  The burner 5, the combustion cylinder 30, the inner cylinder 6, the middle cylinder 8, and the outer cylinder are arranged in a substantially concentric shape, and the upper part of the inner cylinder 6, the middle cylinder 8, and the outer cylinder are appropriately connected to each other, A substantially cylindrical reactor is constructed.

  A through-hole is formed in the central portion of the middle cylinder bottom plate 9, and the middle cylinder 8 uses a space between the inner cylinder 6 and a space between the outer cylinder and the opposite direction at the through-hole of the middle cylinder bottom plate 9. A gas flow path that folds back (from the bottom to the top in FIG. 3) is formed.

  In addition, the hydrogen generator 200 is connected to an external gas pipe on the outer wall surface of the hydrogen generator 200 on the opposite side (lower in FIG. 3) of the gas turn-up portion side (lower in FIG. 3) to the hydrogen generator 200 ( Water for supplying water to the raw material supply path 10 for supplying the raw material to the space between the inner cylinder 6 and the middle cylinder 8 and the hydrogen generator 200 (the space between the inner cylinder 6 and the middle cylinder 8). The supply path 11 is connected.

  In the space formed between the inner cylinder 6 and the middle cylinder 8, the first reforming catalyst layer 1, the temperature raising layer 3, and the second reforming catalyst layer 2 (these are collectively referred to as the reforming catalyst hereinafter). (Referred to as part 20) is arranged in order on the downstream side (downward) of the preheating part 23.

  A heat insulating material 40 is disposed on the surface of the inner cylinder bottom plate 7 facing the burner 5. The heat insulating material 40 is made of a ceramic fiber and has a property capable of withstanding a temperature of 1000 ° C. or lower.

  The basic configuration of the hydrogen generator 200 and the gas flow will be described in more detail.

The hydrogen generator 200 includes a preheating unit 23 that evaporates water supplied from the water supply path 11 and preheats a mixed gas of the raw material and water vapor supplied from the raw material supply path 10.

  In addition, the reforming catalyst unit 20 that advances the reforming reaction between the raw material supplied from the raw material supply path 10 and the steam, and the carbon monoxide and the steam in the reformed gas generated by the reforming catalyst unit 20 are transformed. It has a shift portion 25 that reacts to reduce the carbon monoxide concentration of the reformed gas.

  Furthermore, it has the selective oxidation part 26 mainly oxidized and removed using the air supplied from the air supply part 19 to the hydrogen containing gas after passing through the transformation part 25. The metamorphic unit 25 and the selective oxidation unit 26 constitute a carbon monoxide reduction unit.

  A raw material supply unit is connected to the raw material supply path 10. The raw material supplied from the raw material supply path 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.

  The preheating unit 23 is a hydrogen-containing gas that flows through the derivation unit 12 and the carbon monoxide reduction unit while sharing the one side wall surface between the derivation unit 12 and the carbon monoxide reduction unit (the transformation unit 25 and the selective oxidation unit 26) and the middle cylinder 8. In addition, heat exchange with the catalyst provided in the shift conversion unit 25 and the selective oxidation unit 26 is possible.

  In the hydrogen generator 200, reaction heat necessary for the reforming reaction in the reforming catalyst unit 20 is supplied by heat transfer from the combustion exhaust gas of the burner 5.

  The raw material supplied from the raw material supply path 10 and the water supplied from the water supply path 11 flow between the inner cylinder 6 and the middle cylinder 8 toward the through hole of the middle cylinder bottom plate 9, and are heated by the preheating unit 23 and modified. The reformed gas is reformed by the catalyst unit 20. The direction in which the reformed gas flows in the through hole of the middle tube bottom plate 9 is reversed, flows between the middle tube 8 and the outer tube toward the lead-out unit 12, and passes through the transformation unit 25 and the selective oxidation unit 26. Thus, carbon monoxide in the gas is reduced.

  In the preheating section 23 provided in the space between the inner cylinder 6 and the middle cylinder 8, heat transmitted from the combustion exhaust gas of the burner 5 passing between the combustion cylinder 30 and the inner cylinder 6 through the inner cylinder 6 is used. Then, the water supplied from the water supply path 11 is evaporated and the mixed gas of the raw material and water vapor is preheated.

  In the reforming catalyst unit 20, the reforming catalyst reacts the raw material and steam with the reforming catalyst using the heat transferred from the combustion exhaust gas of the burner 5 passing between the combustion cylinder 30 and the inner cylinder 6 through the inner cylinder 6. To generate reformed gas.

  In the shift section 25 provided in the space between the middle cylinder 8 and the outer cylinder, the carbon monoxide in the reformed gas produced in the reformed catalyst section 20 is caused to undergo a water vapor and water gas shift reaction by the reforming catalyst. Reduce by using carbon dioxide.

  In the selective oxidation section 26 provided on the downstream side (upper side) of the shift section 25 in the space between the middle cylinder 7 and the outer cylinder 15, the residual hydrogen gas remains in the hydrogen-containing gas after the water gas shift reaction in the shift section 25. Carbon oxide is converted into carbon dioxide by the selective oxidation catalyst using air supplied from the air supply unit 19 to the hydrogen-containing gas after passing through the shift conversion unit 25.

  The hydrogen product gas generated by the hydrogen generator 200 is supplied to a fuel cell or the like installed outside via the derivation unit 12. Further, the reforming catalyst unit 20 and the preheating unit 23 are configured such that heat is supplied from the combustion exhaust gas generated by the burner 5 through the wall surface of the inner cylinder 6.

The combustion exhaust gas passes from the burner 5 through the inside of the combustion cylinder 30, hits the lower portion of the inner cylinder 6 and the inner cylinder bottom plate 7 in a high temperature state, passes through a passage formed outside the combustion cylinder 30 and inside the inner cylinder 6, and FIG. The gas is exhausted from the upper right outlet to the outside of the hydrogen generator 200.

  The reforming catalyst unit 20 will be described more specifically. The temperature of the reforming catalyst unit 20 is controlled by the fuel exhaust gas generated by the burner 5 as follows. The first reforming catalyst layer 1 installed at the uppermost stream of the reforming catalyst unit 20 is controlled at a relatively low temperature (for example, 550 ° C. or less), and is sequentially installed downstream of the first reforming catalyst layer 1. The temperature rising layer 3 and the second reforming catalyst layer 2 are controlled to a relatively high temperature. For example, the gas passing through the temperature raising layer 3 is heated from 550 ° C. to 650 ° C., and is controlled at 650 ° C. to 680 ° C. in the second reforming catalyst layer 2.

  FIG. 4 shows an example of the temperature distribution of the reforming catalyst unit 20 in this configuration example. As shown in FIG. 4, according to the temperature distribution of the reforming catalyst unit 20 in the present configuration example, the temperature of the first reforming catalyst layer 1 is controlled to be equal to or lower than the temperature at which ammonia generation can be suppressed, and then the second It becomes possible to control the temperature of the reforming catalyst layer 2 to a higher temperature. That is, even if the filling amount of the second reforming catalyst is reduced, the same performance as the conventional example can be ensured.

  As shown in FIG. 4, in the conventional example, the first reforming catalyst layer 41 and the second reforming catalyst layer 42 are filled from upstream to downstream of the reforming catalyst layer 20.

  On the other hand, in this configuration example, the first reforming catalyst layer 1, the temperature raising layer 3, and the second reforming catalyst layer 2 are configured in this order from the upstream. That is, in FIG. 4, the second reforming catalyst layer 42 (upstream) of the conventional example (conventional example disclosed in Patent Document 2) corresponds to the temperature raising layer 3 of this configuration example.

  At this time, if the downstream temperature of the second reforming catalyst layer 2 of the present configuration example and the downstream temperature of the second reforming catalyst layer 42 (downstream) of the conventional example are combined, Since there is no endothermic reaction in the second reforming catalyst layer 42 (upstream), the upstream temperature of the second reforming catalyst layer 2 in this configuration example is the second reforming catalyst layer 42 (downstream) in the conventional example. ) Higher than the upstream temperature.

  That is, the temperature of the entire second reforming catalyst layer 2 in this configuration example is higher on average than the temperature of the entire second reforming catalyst layer 42 (downstream) of the conventional example, so that the reforming performance is also high. Become.

  As a result, the amount of catalyst corresponding to the second reforming catalyst layer 42 (upstream) of the conventional example can be reduced.

  According to this configuration, it is not necessary to newly use an electric heater or the like as the heater 4, and the hydrogen generator can be designed in a compact manner.

(Embodiment 2)
Next, a hydrogen generator according to Embodiment 2 of the present invention will be described.

  FIG. 5 is a schematic cross-sectional view showing an example of a hydrogen generator according to Embodiment 2 of the present invention.

  As shown in FIG. 5, the hydrogen generator 300 according to Embodiment 2 includes a first reforming catalyst layer 1 and a second reforming catalyst layer 2 that reform a raw material, and a first reforming catalyst layer. 1 is provided with a temperature raising layer 3 for raising the temperature of the gas flowing out from 1 and a heater 4 for heating the temperature raising layer 3, and the second reforming catalyst layer 2 is disposed downstream of the temperature raising layer 3, The heat layer 3 is filled with a heat transfer material 50.

  Examples of the heat transfer material 50 include an alumina layer and a carrier layer of either the first reforming catalyst or the second reforming catalyst.

  The heat transfer material 50 is not limited to the above example as long as it plays a role of transferring heat from the heater 4 to the gas flowing out from the first reforming catalyst layer 1.

  According to this configuration, heat transfer by the heater 4 to the gas flowing out from the first reforming catalyst layer 1 is promoted compared to the case where the temperature raising layer 3 is a space (see FIG. 2). The warm layer 3 can be designed more compactly.

  In particular, according to the configuration in which the carrier layer of either the first reforming catalyst or the second reforming catalyst is used as the heat transfer material 50, the durability of the heat transfer material 50 is higher than when a material such as alumina is separately used. Confirmation is easy. On the other hand, when alumina is used as the heat transfer material 50, an increase in cost due to the use of the heat transfer material 50 can be suppressed.

(Embodiment 3)
Next, a fuel cell system according to Embodiment 3 of the present invention will be described.

  FIG. 6 is a block diagram showing an example of a fuel cell system according to Embodiment 3 of the present invention.

  As shown in FIG. 6, the fuel cell system 500 according to Embodiment 3 includes a hydrogen generator 100 and a fuel cell 400 that generates power using a hydrogen-containing gas supplied from the hydrogen generator 100.

  In FIG. 6, the hydrogen generation apparatus is set to 100. However, the present invention is not limited to this, and any one of the hydrogen generation apparatuses described in the first and second embodiments, that is, the hydrogen generation apparatus 200 and The hydrogen generator 300 may be used.

  Any fuel cell such as a solid polymer fuel cell or a solid oxide fuel cell may be used as long as it is a fuel cell that generates power using a hydrogen-containing gas.

  According to this configuration, since the hydrogen generator 100 can be designed in a compact manner, the fuel cell system 500 can also be designed in a compact manner.

  The present invention can realize a hydrogen generator that is reduced in size and cost by reducing the amount of the expensive reforming catalyst, and thus requires reduction in size and cost as in a domestic fuel cell system. Suitable for use.

DESCRIPTION OF SYMBOLS 1 1st reforming catalyst layer 2 2nd reforming catalyst layer 3 Temperature rising layer 4 Heater 5 Burner 50 Heat transfer material 100 Hydrogen generating device 200 Hydrogen generating device 300 Hydrogen generating device 400 Fuel cell 500 Fuel cell system

Claims (6)

The first reforming catalyst layer and the second reforming catalyst layer for reforming the raw material, the temperature raising layer for raising the temperature of the gas flowing out from the first reforming catalyst layer, and the temperature raising layer are heated. A hydrogen generator, comprising: a heater; and the second reforming catalyst layer is disposed downstream of the temperature rising layer. 2. The catalyst according to claim 1, wherein the second reforming catalyst layer is filled with a catalyst that generates less ammonia than the catalyst that is filled in the first reforming catalyst layer. Hydrogen generator. The hydrogen generator according to claim 1 or 2, wherein the temperature rising layer is filled with a heat transfer material that promotes heat transfer. The hydrogen generation apparatus according to claim 3, wherein the heat transfer material includes at least one support of the first reforming catalyst layer and the second reforming catalyst layer. The hydrogen generator according to claim 3, wherein the heat transfer material includes alumina. A fuel cell system comprising: the hydrogen generator according to any one of claims 1 to 5; and a fuel cell that generates electric power using a hydrogen-containing gas supplied from the hydrogen generator.

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