JP2007331951A - Hydrogen generator and fuel cell system - Google Patents

Abstract

In an integrated hydrogen generator that integrates at least a reforming and metamorphic unit, it is possible to prevent the occurrence of defects such as carbon deposition during start-up and to ensure a heat balance peculiar to the integrated type during normal operation. It was necessary to have a configuration capable of.
A burner, a fuel supply passage, a first air supply passage that supplies air to the burner, a second air supply passage that covers the outer periphery of the first air supply passage and supplies air to a combustion chamber, A combustion chamber 13, a combustion exhaust gas passage 28 covering the combustor, a first gas passage 29 covering the combustion exhaust passage 28 and having a reformer, and a first gas passage 29. , A second gas flow path having a transformer, a flow rate regulator for adjusting the amount of air in the second air supply path, and a controller 27. The controller 27 is a flow rate regulator in the start-up operation. Thus, air is supplied to the combustion chamber 13, and control is performed so that air does not flow through the second air supply path by the flow rate regulator in normal operation.
[Selection] Figure 1

Description

  The present invention relates to a hydrogen generator that generates hydrogen by reacting a hydrocarbon fuel with water vapor, and more particularly to a hydrogen generator suitable for a relatively small fuel cell system for home use.

  Polymer type (PEM) fuel cell systems are being developed as a suitable method for household fuel cell cogeneration systems. However, the hydrogen of fuel is still inadequate, so city gas, LP gas, kerosene, etc. A hydrogen generator for reforming fuel to generate a hydrogen-containing gas is essential for the system. As reforming methods, the use of a steam reforming reaction, the use of a partial oxidation reaction, and the autothermal method using both of them are known, but for high-concentration polymer fuel cell systems, a high concentration is required. Many hydrogen generators using a steam reforming reaction in which hydrogen is easily obtained have been studied.

  When performing a steam reforming reaction, the hydrogen generator usually has a reformer using a reforming catalyst and a shift catalyst for reducing carbon monoxide (hereinafter, CO) in the reformed gas by an aqueous shift reaction. The CO converter includes a CO remover having an oxidation catalyst for reducing carbon monoxide in the hydrogen-containing gas sent from the CO converter by an oxidation reaction. A hydrocarbon-based fuel and water are introduced into the reformer, heated to about 700 ° C. with a burner, and heat required for the reforming reaction, which is an endothermic reaction, is supplied to advance the reforming reaction. At this time, about 10% of CO is generated, so in the downstream CO converter, the catalyst temperature is controlled to about 200 ° C. to 300 ° C., and the shift reaction proceeds to reduce the CO concentration to about 0.5% or less. Further, in the CO remover, the catalyst temperature is controlled to about 100 ° C. to 200 ° C., a small amount of air is introduced, and CO is oxidized on the catalyst to reduce its concentration to about 10 ppm or less. As a result, a hydrogen-containing gas with a hydrogen concentration of about 70% to 75% is obtained at the outlet of the CO remover, and this is supplied to hydrogen-using equipment such as a fuel cell.

  In such a hydrogen generator, the heat required for the reforming reaction in the reformer is supplied from the burner. However, in the reformer, it is necessary to vaporize water as a reaction raw material at the same time. The residual heat of the combustion exhaust gas after heating the reformer is used. Therefore, it is common that the reformer is arranged upstream of the combustion exhaust gas in the flow direction and the water evaporation section is arranged downstream.

  When starting up such a hydrogen generator, when the burner is first ignited, the flue gas flows so as to heat the reformer and then the water evaporation section. At this time, the hydrocarbon fuel gas often stays or flows inside the reformer. In that case, if the temperature of the reformer rises too much without supplying water vapor, carbon deposition occurs due to thermal decomposition of the fuel, leading to an increase in the pressure loss of the reformer flow path. The inside of the vessel may be clogged with precipitated carbon. In order to avoid this, a method of intermittent combustion has been proposed (see, for example, Patent Document 1).

  In order to avoid the above problem, a method of introducing air that is not involved in combustion (see, for example, Patent Document 2) has also been proposed.

In addition, hydrogen generators used in fuel cell systems and the like have demands such as compact size, low cost, high reforming efficiency, ease of handling, and high durability. It is important to meet as much as possible. From these viewpoints, a reforming system in which a reformer, a burner, a transformer, and a selective oxidizer are integrated in a compact manner has been developed (see, for example, Patent Document 3 and Patent Document 4).
JP 2005-170784 A JP 2005-226898 A Japanese Patent No. 3403416 International Publication No. 02/098790 Pamphlet

  In an integrated hydrogen generator that integrates each reaction unit involved in reforming, heat corresponding to the endothermic and exothermic components in each reaction unit is effectively exchanged using the reaction unit or the wall surface of the flow path. In this way, the respective parts are maintained at appropriate temperatures to perform the function as a hydrogen generator, and the structural design is aimed at increasing the reforming efficiency by minimizing the heat dissipated to the outside. As a result, the entire hydrogen generator is thermally balanced under the target conditions, and each reaction section can be maintained at the target temperature. However, in this case, if any of the input conditions of the apparatus changes, the overall heat balance may be lost and the function as a hydrogen generator may not be maintained.

  For example, when the temperature of the outside air changes, the temperature of the combustion air changes. Therefore, if the combustion air is configured to exchange heat with other fluids (for example, raw materials) in the hydrogen generator, this is the case. As a starting point, a phenomenon may occur in which the thermal balance of the entire hydrogen generator is gradually lost. In an integrated hydrogen generator designed to increase heat efficiency and reforming efficiency by performing effective heat exchange and heat recovery between each fluid in each part, such a phenomenon is unavoidable in a sense. A structure and configuration design that takes into consideration are desired.

  Even when such an integrated hydrogen generator is started, it is necessary to have a configuration that can avoid the above-described problems such as carbon deposition, or a configuration that can be operated. In particular, the integrated hydrogen generator is in an environment where each functional unit thermally affects each other, so that it is not only during normal operation, but also under transient conditions such as starting and stopping, It is necessary to make the configuration so as not to cause a malfunction. Therefore, in various hydrogen generators, a method for intermittently heating the heater to heat the reformer at startup and repeating it until the temperature of the evaporation section rises (see, for example, Patent Document 1), introducing air that is not involved in combustion. (For example, refer to Patent Document 2) and the like have been proposed, but regarding the method of intermittent combustion, problems such as long start-up time and unburned gas such as CO are discharged during ignition and extinguishing In order to apply the method of introducing air that is not involved in combustion to the integrated hydrogen generator, it is necessary to achieve both the above-described heat balance unique to the integrated hydrogen generator. Was left.

  The present invention solves the above-mentioned conventional problems, and can be started smoothly without worrying about carbon deposition in the starting operation, can perform an efficient reforming reaction even in normal operation, and can be used for disturbances such as changes in environmental temperature. An object of the present invention is to provide a hydrogen generator that integrates each reaction section capable of stable operation.

In order to solve the above problems, a hydrogen generator of the present invention includes a burner body, a fuel supply path for supplying fuel to the burner, a first air supply path for supplying air to the burner, and the air supply path. A cylindrical combustor having a second air supply passage for supplying air to the combustion chamber and a combustion chamber, and a combustion exhaust gas that covers the outer periphery of the combustor and is sent from the combustion chamber flows An annular combustion gas channel, a reformer that covers the outer periphery of the combustion gas channel, generates a hydrogen-containing gas from the raw material and steam by a reforming reaction, and the raw material and steam supplied to the reformer An annular first gas passage having a mixed gas passage through which a mixed gas flows, and an outer periphery of the first gas passage having a configuration capable of transferring heat with the first gas passage, and the reforming Carbon monoxide in the hydrogen-containing gas delivered from the vessel An annular second gas flow path having at least a shift reaction unit, a flow rate regulator for adjusting a flow rate of air flowing through the second air supply path, and a controller, wherein the controller is configured to perform the flow rate in a starting operation. Air is supplied to the combustion chamber by a regulator, and control is performed so that the supply of air to the combustion chamber is stopped by the flow rate regulator in a normal operation after the start-up operation.

  With such a configuration, in the start-up operation, air is supplied from the second air supply path to the combustion chamber by the flow rate regulator, and the combustion exhaust gas is appropriately cooled so that the raw material does not precipitate carbon in the reformer. In addition to being able to control each reaction part of the integrated hydrogen generator within a range to quickly raise the temperature to an appropriate temperature and to stop air flow in the second air supply path during normal operation, this part is an air insulation layer Thus, even when the outside air temperature changes, the temperature of the air flowing through the first air supply path has little thermal effect on the reaction part and the flow gas in the first gas flow path and the second gas flow path. Therefore, stable operation is possible against changes in external factors.

  Moreover, the hydrogen generator of the present invention is characterized in that the second air supply path is provided inside the first gas flow path via a partition wall.

  Moreover, the hydrogen generator of the present invention is characterized in that the fuel supply path is provided inside the second air supply path.

  With such a configuration, the influence of the temperature fluctuation of the fuel linked to the outside air temperature during normal operation on the flue gas in the flue gas passage is reduced by the air layer in the second air passage, Thus, a more compact configuration of the hydrogen generator can be achieved.

  The hydrogen generator of the present invention comprises a blower and a flow divider downstream of the blower, and the air supplied by the blower is diverted or switched between the first air supply path and the second air supply path by the flow divider. It is possible.

  The hydrogen generator of the present invention includes a first blower for supplying air to the first air supply path and a second blower for supplying air to the second air supply path, A closing valve or a backflow prevention valve is provided in at least one of the first air supply path and the second air supply path.

  In addition, the hydrogen generator of the present invention includes a temperature detector that detects the temperature of the reformer, and in the start-up operation, the controller uses the flow rate regulator based on the temperature detected by the temperature detector. Control is performed so that the amount of air supplied to the combustion chamber is adjusted.

  As described above, in the integrated hydrogen generator, in the start-up operation, each reaction part of the integrated hydrogen generator is quickly heated to an appropriate temperature in the temperature range so that the raw material does not precipitate carbon in the reformer. In order to enable control, it is effective to adjust the amount of air supplied from the second air supply path by the air flow rate regulator based on the temperature of the reformer.

  A fuel cell system according to the present invention includes the hydrogen generator according to the present invention and a fuel cell that generates electric power using a hydrogen-containing gas supplied from the hydrogen generator.

According to the hydrogen generator of the present invention, in the start-up operation, it becomes possible to control each reaction part of the hydrogen generator to be quickly heated to an appropriate temperature in a temperature range so that the raw material does not precipitate carbon in the reformer. In addition, it is possible to provide an integrated hydrogen generator that is less susceptible to external factors such as the outside air temperature during normal operation and that is less affected by its characteristics and can be operated stably.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of an essential part of the hydrogen generator in Embodiment 1 of the present invention. In FIG. 1, 1 is a first cylindrical body, 2 is a second cylindrical body, 3 is a third cylindrical body, and 4 is a fourth cylindrical body, which are arranged substantially concentrically from the inside. A combustion exhaust gas flow path 28 is formed in the space between the first cylindrical body 1 and the second cylindrical body 2, and the annular first gas is formed in the space between the second cylindrical body 2 and the third cylindrical body 3. The flow path 29 is configured, the annular second gas flow path 30 is configured in the space between the third cylindrical body 3 and the fourth cylindrical body 4, and the burner 12 and the burner 12 are formed in the inner space of the first cylindrical body 1. A fuel supply path 14 for supplying fuel, a first air supply path 21 for supplying combustion air, a second air supply path 22, and a combustion chamber 13 are provided. The combustor of the present invention is configured as a whole from the burner 12, the fuel supply path 14, the first air flow path 21, the second air flow path, and the combustion chamber 13. The combustion chamber 13 and the combustion exhaust gas passage 28 communicate with each other via an exhaust turn-back portion 23 in the vicinity of the end portion. Further, the first gas flow path 29 and the second gas flow path 30 are similarly communicated with each other through the raw material turn-back portion 24 in the vicinity of the end portion. The first gas passage 29 is provided with a reformer 5 filled with a reforming catalyst. Here, a spherical catalyst in which metal ruthenium is supported on an alumina carrier is used as the reforming catalyst, but in addition to this, a nickel catalyst, a platinum catalyst, a platinum group catalyst such as rhodium, or the like can be used. In addition to the spherical shape, a so-called monolith type catalyst obtained by forming a ceramic such as cordierite or a heat-resistant metal thin plate into a honeycomb shape can be used as well as a generally called pellet catalyst such as a columnar shape. The second gas flow path 29 is provided with a shifter 6 filled with a shift catalyst and a CO remover 7 filled with a selective oxidation catalyst. Here, a spherical platinum-based catalyst is used as the shift catalyst, but it is naturally possible to use a copper / zinc-based catalyst mainly composed of copper. Further, although the ruthenium-based spherical catalyst is used as the selective oxidation catalyst, a platinum-based catalyst or the like can be selected according to the purpose. Furthermore, although both the shift catalyst and the selective oxidation catalyst are spherical in this case, a pellet catalyst or a monolith catalyst having a different shape from that of the reforming catalyst can be used as a matter of course. 25 is an air supply pipe for performing an oxidation reaction with the selective oxidation catalyst of the CO remover 7, and 8 is a raw material introduction pipe from which hydrocarbon fuel and water, which are raw materials for the steam reforming reaction, are separated. Supplied. Here, city gas is used as the fuel, but other hydrocarbon fuels such as LP gas can be used as a matter of course. These hydrocarbon-based fuels contain sulfur compounds added as odorants, but they are removed when passing through a desulfurization section (not shown) installed upstream of the raw material introduction pipe 8 and carbonized after desulfurization. Hydrogen fuel is supplied to the reformer. Here, ion-exchanged water was used as the other raw material water. Reference numeral 10 denotes a reformed gas outlet from which the hydrogen-containing gas generated by reforming is discharged, and a fuel cell that generates power using this gas is connected to the outlet. Reference numeral 9 denotes a flow path defining member provided in a part of the first gas flow path 29. A helical first gas flow path is formed between the spirally installed members, and the raw material is in the space. The water is evaporated by the heat of the flue gas flowing through the flue gas passage 28 while passing through the gas and mixed with the city gas and introduced into the reformer 5. Reference numeral 26 denotes a heat insulating material that covers the entire hydrogen generation apparatus, prevents heat dissipation from the hydrogen generation apparatus, and prevents a reduction in reforming efficiency. Although the member which shape | molded the ceramic fiber is used here as a heat insulating material, it is not restricted to this. 15 is a blower for supplying air, and the air sent from the blower 15 is diverted by a flow divider 16 and branched to a first air supply pipe 17 and a second air supply pipe 18. Reference numerals 19 and 20 denote a first air shut-off valve and a second air shut-off valve provided in the first air supply pipe 17 and the second air supply pipe 18, respectively. One can be omitted. The flow regulator of the present invention corresponds to at least one of the blower 15 and the flow divider 16 and the first air shut-off valve. Reference numeral 11 denotes a temperature detector. Although a thermocouple is used here, a high-temperature heat-resistant thermistor, a resistance temperature detector, or the like can also be used. Reference numeral 27 denotes a controller for controlling the flow rate controller of the present invention, and particularly controls at least one of the blower 15 and the flow divider 16 according to the output signal of the temperature detector 11 in the starting operation.

  Next, the operation of the configuration of the hydrogen generator will be described. Before the hydrogen generator is started, the first gas flow path 29 including the reformer 5 filled with the reforming catalyst, the shifter 6 filled with the shift catalyst, and the CO remover 7 filled with the selective oxidation catalyst. The second gas flow path 30 (inside the so-called hydrogen generator) is filled with fuel gas (here, city gas) in order to prevent deterioration of each reaction catalyst as much as possible. This is because the activity of each catalyst may be deteriorated by receiving a history such as oxidation due to air mixing and water wetting due to condensation of residual water vapor.

  In this state, the hydrogen generator is started. Combustion fuel is supplied to the burner 12 from the fuel supply path 14. Although the fuel is city gas, it can also be supplied directly from a fuel supply unit (not shown) via a flow rate controller or the like. However, the off-gas of the fuel cell system is passed from the raw material introduction pipe 8 through the inside of the hydrogen generator. It is also possible to supply via a route (not shown). Which method to use from these can be selected as appropriate according to the configuration of the entire fuel cell system. Here, the city gas is supplied from the raw material introduction pipe 8 through the inside of the hydrogen generator, and via a path for bypassing the fuel cell and an off-gas path (not shown) of the fuel cell system at startup. . Therefore, while the fuel cell is generating power, the remaining anode off-gas of hydrogen consumed in the stack is supplied from the raw material introduction pipe 8 as combustion fuel while passing through the fuel cell.

  At this time, of course, the city gas from the fuel supply unit can be appropriately mixed and burned. Simultaneously with the supply of the combustion fuel, the blower 15 is operated, the flow divider 16 is operated as required, and the first air shut-off valve 19 on the first air supply pipe 17 is opened, so that the combustion air is also burned. The burner 12 is ignited by operating an igniter (not shown) and combustion is started in the combustion chamber 13. The first air shut-off valve 19 on the first air supply pipe 17 and the second air shut-off valve on the second air supply pipe 18 are connected from the blower 15 to the first air supply path 21 and the second air supply path 22, respectively. It is also possible to substitute a backflow prevention valve that opens in the direction toward and closes in the reverse direction.

  The combustion chamber 13 and the combustion exhaust gas passage 28 are heated by the combustion heat and the retained heat of the combustion exhaust gas at the start of combustion in the burner 12, and the adjacent first gas passage 29 and the reformer provided therein 5 is heated. At this time, only the city gas is supplied from the raw material introduction pipe 8, but water must be supplied to the reformer 5 in the state of steam in order to cause the reforming reaction. For this reason, a flow regulating member 9 is provided in the space between the raw material introduction pipe 8 and the reformer 5 in the first gas flow path 29 to increase the passage distance of the raw material, and heat exchange with the combustion exhaust gas flow path is sufficient. I can do it. Therefore, at the time of supplying raw water, the portion functions as a raw water evaporating part and a raw material city gas mixing part (this part is referred to as an evaporating part 31). However, the temperature of the evaporating section is difficult to increase because it is away from the combustion chamber, while the temperature of the reformer 5 is easily increased because it is close to the combustion chamber.

At this time, if an excessive temperature rise is caused while only the raw city gas flows through the first gas flow path 29, the city gas is thermally decomposed in the reformer 5 or the first gas flow path 29 in the vicinity thereof. Carbon deposition may occur. This must be avoided because damage to the hydrogen generator such as an increase in flow path pressure loss and blockage of the flow path is great. Therefore, while the temperature of the reformer 5 is kept below the temperature at which pyrolysis does not occur (about 500 ° C., desirably 400 ° C. or less), the temperature of the evaporation section 31 downstream thereof is higher than the temperature at which water can be sufficiently evaporated (about 100 ° C. or more ) Need to rise quickly. For this purpose, a method of increasing the amount of combustion air while reducing the amount of combustion of the burner 12 and transmitting the retained heat of the combustion exhaust gas further downstream than the reformer 5 is effective, but simply increasing the amount of combustion air Since the combustion in the burner 12 becomes lean combustion at a high air ratio, the possibility that the combustion becomes unstable and extinguishes becomes high. In order to avoid this, it is effective to send air that is not directly involved in combustion.

  Here, the rotational speed of the blower 15 is increased, the flow divider 16 is operated, the second air shut-off valve is opened, and the air flows through the second air supply path 22. As a result, the air sent to the second air supply path 22 is supplied to the combustion chamber 13, but since it does not participate in combustion, an exhaust gas state can be created when the air ratio is increased without lowering the quality of combustion. . By doing so, it became possible to smoothly raise the temperature of the evaporator 31 to 100 ° C. or higher while keeping the temperature of the reformer 5 at 400 ° C. or lower.

  At this time, the temperature of the reformer 5 is detected by the temperature detector 11, and at least one of the blower 15 and the flow divider 16 is controlled by the controller 27, and an appropriate air amount is controlled by the first air supply path 21 and the second air. Supply to the supply path 22. On the other hand, it is desirable to detect the temperature of the evaporator 31 with a temperature detector attached at or near the evaporator 31, but the temperature attached to the transformer 6 or the CO remover 7 of the adjacent second gas flow path 30. The detection temperature of the detector can be substituted.

  When the evaporation section 31 exceeds 100 ° C., when the supply of air to the second air supply passage is stopped and the supply of the raw material water from the raw material introduction pipe 8 is started, the reformer 5 is supplied with city gas and water vapor. The mixed gas is supplied and the reforming reaction is started. When air for selective oxidation reaction is supplied from the air supply pipe 25 at substantially the same time, the reactions of the reformer 5, the transformer 6 and the CO remover 7 are started, and the whole begins to function as a hydrogen generator.

  After that, when it can be determined that the temperature of each reaction part has reached the normal operation state, the fuel cell is connected to start supplying hydrogen-containing gas, and the fuel cell starts power generation. During normal operation (power generation), the second air supply path 22 only retains air and there is no air flow. Combustion air is supplied from the first air supply path 21. For example, the temperature of the supply air changes by about 20 to 40 degrees in summer and winter. At this time, since the air staying in the second air supply path 22 functions as a heat insulating layer, the temperature change of the first air supply path 21 does not affect the temperature of the combustion exhaust gas flow path 21. Without the second air supply path 22, the temperature change in that portion exchanges heat with the combustion exhaust gas in the combustion exhaust gas flow path 21 and affects the temperature of the combustion exhaust gas flow path 21. The temperature of the gas flow path 29 is affected, and the overall temperature balance may be disturbed, and normal reforming operation may be impaired. Thus, in the integrated hydrogen generator designed to maintain the overall temperature balance while exchanging heat with each part, changes in input conditions such as temperature at one location are likely to greatly affect the overall performance. A design that takes this into account is necessary.

Example 1
With the configuration of the hydrogen generator disclosed in the first embodiment, a hydrogen generator that can supply a hydrogen amount equivalent to about 1 kW (about 1 m ³ / h) by power generation of the fuel cell was manufactured and a start-up test was performed. As described above, in the activation using the second air supply path 22, it took about 40 minutes from the ignition of the burner 12 to the start of power generation of the stack.

(Comparative Example 1)
On the other hand, in the start-up test in which the same hydrogen generator is used and the combustion of the burner 12 is turned ON / OFF in order to raise the temperature of the evaporator 31 while maintaining the reforming temperature at 400 ° C. or less without using the second air supply path 22. It took about 60 minutes from the first ignition of the burner 12 to the start of power generation of the stack. At this time, the burner 12 was turned on and off three times, but a slight amount of unburned gas (CO, HC) was observed during ignition and digestion.

  As described above, according to the above embodiment, by providing the second air supply path 22 for introducing the air that does not directly affect the combustion into the combustion chamber, the start-up time is shortened and the start is very smooth and clean. Is possible. Further, the second air supply path 22 functions as an air insulation layer in order to prevent air from flowing through the second air supply path during normal operation after the start-up operation has been completed, and thus the influence of disturbances such as changes in air temperature is affected. Eliminate as much as possible to enable stable operation during normal operation of the integrated hydrogen generator.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a main part of the hydrogen generator according to Embodiment 2 of the present invention. In FIG. 2, the same components as those in FIG.

  In FIG. 2, the structure which provided the 1st air blower 41 for the air supplied to the 1st air supply path 21, and provided the 2nd air blower 42 for the 2nd air supply path 22 is disclosed. The other parts are the same as in FIG. 1, but the first air shut-off valve 19 on the first air supply pipe 17 and the second air shut-off valve 20 on the second air supply pipe 18 are the first and second blowers, respectively. As in the case of FIG. 1, it is possible to substitute a backflow prevention valve that opens in the direction from 41 and 42 toward the first air supply path 21 and the second air supply path 22 and closes in the reverse direction. .

  In the start-up operation in the present embodiment, air supply to the second air supply path 22 is performed by starting the operation of the second blower 42 and opening the second air shut-off valve 20. With this operation, smooth start-up can be performed as in FIG. In addition, the operation of the evaporator 31 is stopped in a state where the temperature is appropriate, as in the first embodiment in FIG.

  The hydrogen generator according to the present invention has a function of effectively generating hydrogen from hydrocarbon fuels such as city gas and LP gas using a steam reforming reaction, and is expected to be used in cogeneration systems and the like. It is useful as a fuel hydrogen generator for a fuel cell system. In particular, it is highly applicable to relatively small systems for home use and small business use. In addition, this apparatus alone can be applied to industrial uses as a hydrogen generator.

1 is a longitudinal sectional view of main parts of a hydrogen generator according to Embodiment 1 of the present invention. Main part longitudinal cross-sectional view of the hydrogen generator in Embodiment 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st cylindrical body 2 2nd cylindrical body 3 3rd cylindrical body 4 4th cylindrical body 5 Reformer 6 Transformer 7 CO remover 11 Temperature detector 12 Burner 13 Combustion chamber 19 1st air shut-off valve 20 2nd air Stop valve 21 First air supply path 22 Second air supply path 28 Combustion exhaust gas flow path 29 First gas flow path 30 Second gas flow path

Claims (7)

A burner main body, a fuel supply path for supplying fuel to the burner, a first air supply path for supplying air to the burner, and a second air for covering the outer periphery of the air supply path and supplying air to the combustion chamber A cylindrical combustor having a supply path and a combustion chamber;
An annular flue gas passage that covers the outer periphery of the combustor and through which flue gas sent from the combustion chamber flows;
A reformer that covers the outer periphery of the combustion gas flow path and generates a hydrogen-containing gas from the raw material and steam by a reforming reaction, and a mixed gas flow path through which a mixed gas of the raw material and steam supplied to the reformer flows A hydrogen-containing gas that is provided on the outer periphery of the first gas flow path in a configuration capable of transferring heat with the first gas flow path and that is delivered from the reformer An annular second gas flow path having at least a shift reaction part for reducing carbon monoxide therein, a flow rate regulator for adjusting the flow rate of air flowing through the second air supply path, and a controller,
The controller controls to supply air to the combustion chamber by the flow rate regulator in the startup operation, and to stop supplying air to the combustion chamber by the flow rate regulator in normal operation after the startup operation. Characteristic hydrogen generator. The hydrogen generation apparatus according to claim 1, wherein the second air supply path is provided inside the first gas flow path via a partition wall. The hydrogen generation apparatus according to claim 1, wherein the fuel supply path is provided inside the second air supply path. A blower and a flow divider on the downstream side of the blower are provided, and the air supplied by the blower can be divided or switched between the first air supply path and the second air supply path by the flow divider. The hydrogen generator according to claim 1. A first blower for supplying air to the first air supply path; and a second blower for supplying air to the second air supply path, wherein the first air supply path and the second air supply path are provided. The hydrogen generator according to claim 1, wherein a shut-off valve or a backflow prevention valve is provided in at least one of the air supply paths. A temperature detector for detecting the temperature of the reformer is provided, and in the start-up operation, the controller has an amount of air supplied to the combustion chamber by the flow rate regulator based on a temperature detected by the temperature detector. It controls so that it may be adjusted, The hydrogen generator of Claim 1 characterized by the above-mentioned. A fuel cell system comprising: the hydrogen generator according to any one of claims 1 to 6; and a fuel cell that generates electric power using a hydrogen-containing gas supplied from the hydrogen generator.

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