JP5534866B2 - HYDROGEN GENERATOR AND ITS START-UP METHOD, FUEL CELL SYSTEM AND ITS START-UP METHOD - Google Patents

Description

  The present invention relates to a hydrogen generator and a startup method thereof, a fuel cell system, and a startup method thereof.

  The fuel cell system includes a fuel cell main body and a hydrogen generator that generates hydrogen to be supplied to the fuel cell main body. The hydrogen generator includes, for example, a combustion section and a reforming section, and is supplied with a hydrocarbon-based fuel and generates hydrogen by, for example, a steam reforming reaction. The combustion section is provided with a burner for combustion, and supplies the amount of heat necessary for the reforming reaction. The reforming section is provided at a position adjacent to the combustion section and is filled with a reforming catalyst. Each of the combustion section and the reforming section has an airtight structure. Since the reforming pipe (or reforming plate) between the combustion section and the reforming section is exposed to a high-temperature combustion gas of about 1100 to 1300 ° C., generally a member having heat resistance and corrosion resistance Is used.

  At the time of starting the hydrogen generator, the temperature of the combustion section is rapidly increased from the normal temperature state by the burner flame. At this time, the temperature of the reforming section filled with the reforming catalyst gradually increases due to heat transfer through the reforming pipe which is a partition wall with the combustion section. For this reason, it tends to produce a large temperature difference between the combustion section and the reforming section. Since the temperature of the reforming pipe between the combustion section and the reforming section becomes high, a large thermal elongation occurs with respect to the container constituting the reforming section. As a result, stress concentrates on the joint, which causes cracks.

  For example, Patent Literature 1 and Patent Literature 2 disclose methods for improving resistance to thermal stress generated in a hydrogen generator. As this method, there are a method of using a more special material and a method of making a structure that restrains thermal elongation as much as possible. In addition, in order to relieve the generated thermal stress, there is a method of improving the heat resistance cycle by providing an expansion joint in the container constituting the combustion part / reforming part.

JP 2003-226506 A JP 2008-169089 A

  In order to improve the resistance to the thermal stress generated in the hydrogen generator, the use of a special material having heat resistance tends to be expensive. Further, in the method of structural relaxation, there is a limit to the degree of thermal stress relaxation, and since such a structure is complicated, it tends to be expensive.

  Therefore, an object of the present invention is to prevent an excessive thermal stress from being generated in a hydrogen generator of a fuel cell system without excessively increasing the manufacturing cost.

In order to achieve the above-mentioned object, the present invention accommodates a catalyst for generating a steam reforming reaction between hydrocarbon fuel and steam surrounded by an outer wall and a partition plate fixed to the outer wall in a hydrogen generator. A temperature difference measuring means for measuring a temperature difference between a reforming unit, a combustion unit provided facing the partition plate and generating heat, and a point on the combustion unit side of the partition plate and a point inside the reforming unit When the temperature difference at the time of startup becomes equal to or higher than a predetermined value, the temperature difference is controlled to be equal to or lower than the predetermined value while reducing the heat generation amount per unit time of the combustion unit, and the catalyst reaches a predetermined temperature. until allowed to exotherm to the combustion section and having a a temperature difference controlling means you heat the catalyst.

Further, the present invention provides a fuel cell system in which a fuel cell, a reformer that contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam surrounded by an outer wall and a partition plate fixed to the outer wall. A temperature difference measuring means for measuring a temperature difference between a point on the combustion plate side facing the partition plate and generating heat, a point on the combustion portion side of the partition plate and a point inside the reforming unit, When the temperature difference becomes greater than or equal to a predetermined value at startup, the temperature difference is controlled to be equal to or less than a predetermined value while reducing the amount of heat generated per unit time of the combustion unit until the catalyst reaches a predetermined temperature. allowed to exotherm to the combustion section and having a hydrogen generating device for supplying hydrogen to the fuel cell and a temperature difference controlling means you heat the catalyst.

  Further, the present invention faces a reforming section that contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam surrounded by an outer wall and a partition plate fixed to the outer wall, and the partition plate. In a method for starting a hydrogen generator provided with a combustion section that generates heat, a temperature difference measurement step for measuring a temperature difference between a point on the combustion section side of the partition plate and a point inside the reforming section; A heating step of heating the catalyst by causing the combustion section to generate heat until the catalyst reaches a predetermined temperature, and reducing the amount of heat generated per unit time of the combustion section when the temperature difference exceeds a predetermined value And a calorific value reduction step.

  Combustion that is surrounded by an outer wall and a partition plate fixed to the outer wall and contains a reforming unit that contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam, and that faces the partition plate and generates heat In the start-up method of the fuel cell system comprising a hydrogen generator having a section and a fuel cell, a temperature difference for measuring a temperature difference between a point on the combustion section side of the partition plate and a point inside the reforming section A measurement step, a heating step of heating the catalyst by causing the combustion portion to generate heat until the catalyst reaches a predetermined temperature, and a unit per unit time of the combustion portion when the temperature difference becomes a predetermined value or more. A heating value reduction step for reducing the heating value and a raw fuel supply step for supplying raw fuel to the reforming section when the catalyst is at a predetermined temperature or higher are provided.

  According to the present invention, it is possible to prevent excessive thermal stress from being generated in the hydrogen generator of the fuel cell system without excessively increasing the manufacturing cost.

It is a block diagram in one embodiment of a fuel cell system concerning the present invention. It is a flowchart at the time of starting of the hydrogen generator in one embodiment of the fuel cell system concerning the present invention. It is a graph which shows the time change of the temperature of each part of the reformer in one embodiment of the fuel cell system concerning the present invention.

  Embodiments of a fuel cell system according to the present invention will be described with reference to the drawings. Note that this embodiment is merely an example, and the present invention is not limited thereto.

  FIG. 1 is a block diagram of an embodiment of a fuel cell system according to the present invention.

  The fuel cell system includes a fuel cell 70 and a hydrogen generator 10. The hydrogen generator 10 generates hydrogen by a steam reforming reaction using pure water supplied from the reformed water supplier 41 and hydrocarbon fuel supplied from the raw fuel supplier 40. The hydrogen generated by the hydrogen generator 10 is supplied to the fuel cell 70 and used for the power generation reaction. The hydrogen generator 10 includes a reformer 11, a carbon monoxide converter 12, a carbon monoxide remover 13, a steam generator 14, a first heat exchanger 51, a second heat exchanger 52, and a controller 60. ing.

  The reformer 11 includes a reforming unit 17 and a combustion unit 16. The reformer 11 is formed using stainless steel having heat resistance and corrosion resistance.

  The reforming part 17 is surrounded by an outer wall 21 and a partition plate 22 fixed to the outer wall 21. The partition plate 22 of the reforming unit 17 is formed in a cylindrical shape. The outer wall 21 of the reformer 17 includes a cylindrical partition plate 22 and a concentric cylinder, and a plate that blocks between the partition plate 22 at both axial ends thereof. That is, in the present embodiment, the reforming portion 17 is formed in an annular shape.

  A reforming catalyst 23 is housed inside the reforming unit 17. The reforming catalyst 23 is disposed along the partition plate 22. A portion of the reforming unit 17 where the reforming catalyst 23 is not disposed is a cavity.

  In the vicinity of the portion of the reforming unit 17 where the reforming catalyst 23 is disposed, an inlet 24 through which reforming steam and hydrocarbon fuel are introduced is provided. Further, the reforming unit 17 is provided with a discharge port 25 that communicates with a hollow portion in which the reforming catalyst 23 is not disposed and discharges the hydrogen rich gas generated by the reforming reaction.

  The combustion unit 16 is provided facing the partition plate 22. In the present embodiment, the columnar region inside the cylindrical partition plate 22 is the combustion section 16. An air supply device 30 and a burner fuel supply device 31 are connected to the combustion unit 16. A burner air adjustment valve 64 is provided between the air supply unit 30 and the combustion unit 16. A burner fuel adjustment valve 63 is provided between the burner fuel supplier 31 and the combustion unit 16. A discharge pipe 32 is attached to the combustion unit 16.

  The reforming water supply unit 41 includes, for example, a tank (not shown) for storing pure water, a pump (not shown) for sending the stored pure water, and the like, and is used for the steam reforming reaction. Supply. The reforming water supplier 41 is connected to the low temperature side inlet of the second heat exchanger 52. The low temperature side outlet of the second heat exchanger 52 is connected to the low temperature side inlet of the steam generator 14.

  The raw fuel supplier 40 is connected to the low temperature side inlet of the first heat exchanger 51. The raw fuel supplier 40 is, for example, a city gas pipe or an LP gas tank, and supplies a hydrocarbon-based fuel used for the steam reforming reaction. The outlet on the low temperature side of the steam generator 14 is connected in the middle of a pipe extending from the raw fuel supplier 40 to the first heat exchanger 51.

  The low temperature side outlet of the first heat exchanger 51 is connected to the inlet 24 of the reforming unit 17. The outlet 25 of the reforming unit 17 is connected to the high temperature side inlet of the first heat exchanger 51. The outlet on the high temperature side of the first heat exchanger 51 is connected to the inlet of the carbon monoxide transformer 12. The outlet of the carbon monoxide transformer 12 is connected to the inlet on the high temperature side of the second heat exchanger 52. The outlet on the high temperature side of the second heat exchanger 52 is connected to the inlet of the carbon monoxide remover 13. The outlet of the carbon monoxide remover 13 is connected to the fuel cell 70.

  A first thermometer 61 is attached to the partition plate 22. The 1st thermometer 61 is provided in the position which measures typical temperature which can express the amount of thermal expansion of the partition plate 22, such as the position where temperature becomes the highest at the combustion part 16 side of the partition plate 22, for example. .

  A second thermometer 62 for measuring the temperature is attached inside the reforming unit 17. The second thermometer 62 is provided at a position for measuring a representative temperature that can express the amount of thermal expansion of the outer wall 21 of the reforming unit 17, such as the vicinity of the outlet of the reforming catalyst 23.

  That is, the difference in temperature measured by the first thermometer 61 and the second thermometer 62 is a value that can express the difference in thermal expansion between the partition plate 22 and the outer wall 21 of the reforming unit 17. The first thermometer 61 and the second thermometer 62 are, for example, thermocouples.

  The temperatures measured by the first thermometer 61 and the second thermometer 62 are transmitted to the controller 60. The controller 60 controls the burner fuel adjustment valve 63 and the burner air adjustment valve 64 based on these temperatures. By controlling the opening / closing amounts of the burner fuel adjustment valve 63 and the burner air adjustment valve 64, the controller 60 controls the combustion in the combustion unit 16, that is, the heat generation amount.

  In the present embodiment, the burner fuel adjustment valve 63 and the burner air adjustment valve 64, which are continuously variable in valve opening, are provided so that the amount of heat generated in the combustion section 16 can be controlled. The amount may be controlled. For example, a heat generation amount may be changed by switching between ignition and misfire in the combustion unit 16 using a shut-off valve that only opens and closes the valve. Alternatively, when a blower is used for the air supply device 30, the amount of heat generated can be changed by changing the amount of air supplied to the combustion section 16 by changing the rotational speed of the blower.

  The reformed water supplied from the reformed water supplier 41 is sent to the low temperature side of the second heat exchanger 52. The reformed water heated through the low temperature side of the second heat exchanger 52 is sent to the low temperature side of the steam generator 14. The reformed water sent to the steam generator 14 is heated to become steam. The reformed water that has become steam is mixed with the hydrocarbon-based fuel sent from the raw fuel supplier 40 and sent to the low temperature side of the first heat exchanger 51. The mixed gas of steam and hydrocarbon fuel sent to the first heat exchanger 51 is heated by the first heat exchanger 51 and then sent to the reforming unit 17 of the reformer 11.

  Air is supplied to the combustion section 16 of the reformer 11 by an air supply device 30 and fuel for burner combustion is supplied by a burner fuel supply device 31. In the combustion section 16, the burner combustion fuel burns. The heat generated by the combustion in the combustion unit 16 passes through the partition plate 22 of the reformer 11 and is transmitted to the reforming unit 17. The combustion exhaust gas in the combustion section 16 is discharged from the discharge pipe 32. The combustion exhaust gas from the combustion section 16 discharged from the discharge pipe 32 is supplied to the high temperature side of the steam generator 14.

  In the reforming unit 17 heated by the heat generated in the combustion unit 16, a steam reforming reaction occurs to generate hydrogen. The hydrogen rich gas containing hydrogen generated in the reforming unit 17 is sent to the high temperature side of the first heat exchanger 51. The hydrogen-rich gas that has passed through the high temperature side of the first heat exchanger 51 and heat-exchanged with the mixed gas of water vapor and hydrocarbon fuel that passes through the low temperature side of the first heat exchanger 51 is converted into the carbon monoxide converter 12. Sent to.

  Most of the carbon monoxide contained in the hydrogen-rich gas sent to the carbon monoxide converter 12 is converted to carbon dioxide by the shift reaction. The hydrogen rich gas in which the concentration of carbon monoxide is reduced in the carbon monoxide converter 12 is sent to the high temperature side of the second heat exchanger 52. The hydrogen-rich gas that has passed through the high temperature side of the second heat exchanger and exchanged heat with the reformed water that passes through the low temperature side of the second heat exchanger 52 is sent to the carbon monoxide remover 13.

  Carbon monoxide contained in the hydrogen-rich gas sent to the carbon monoxide remover 13 is almost removed by the carbon monoxide remover 13. The hydrogen-rich gas from which carbon monoxide has been almost removed by the carbon monoxide remover 13 is sent to the fuel cell 70. Hydrogen contained in the hydrogen-rich gas sent to the fuel cell 70 is used for a power generation reaction together with oxygen in the air separately supplied to the fuel cell 70.

  Next, a startup method of the hydrogen generator 10 in such a fuel cell system will be described. Here, the start includes not only the start of the first operation but also the restart when the operation of generating hydrogen is performed in the hydrogen generator and then the operation is shifted to the operation of generating hydrogen again. For this reason, when starting the hydrogen generator, the combustion unit 16 and the reforming unit 17 of the hydrogen generator 10 are in a state where the temperature is lower than that in the steady operation state. In particular, when a long time has passed since the start-up and the steady operation are completed for the first time, the combustion unit 16 and the reforming unit 17 are started from a state where the temperature is substantially equal to the temperature of the installation site.

FIG. 2 is a flowchart at the time of startup of the hydrogen generator of the present embodiment. FIG. 3 is a graph showing the change over time in the temperature of each part of the reformer in the present embodiment. In FIG. 3, the solid line indicates the temperature TC1 measured by the first thermometer 61 installed in the combustion section 16, the alternate long and short dash line indicates the temperature TC2 measured by the second thermometer 62 installed in the reforming section 17, and the broken line indicates these. The temperature difference TC1-TC2 is shown.

  When starting of the hydrogen generator 10 is started, first, the first temperature raising step is entered (S1 to S4, S11). In the first temperature raising step, the combustion section 16 of the reformer 11 is purged (S1). The purging of the combustion unit 16 is performed by opening the burner air adjustment valve 64 and introducing air from the burner air supply device 30 into the combustion unit 16.

  When the purge of the combustion unit 16 is completed, the combustion unit 16 is ignited (S2). The ignition of the combustion unit 16 is performed by opening the burner fuel adjustment valve 63, supplying starter fuel from the burner fuel supplier 31, and turning on the igniter.

  When the combustion unit 16 provided in the reformer 11 is ignited, the temperature increase in the first temperature increase step starts. At this time, the reforming section 17 filled with the reforming catalyst 23 is heated by the heat recovered by the steam generator 14 from the combustion exhaust gas of the combustion section 16. Further, a heater for heating may be provided in the reforming unit 17 to heat the reforming unit 17 directly.

  During the first temperature raising step, the temperature TC1 measured by the first thermometer 61 installed in the combustion section 11 and the temperature TC2 measured by the second thermometer 62 installed in the reforming section 17 are monitored ( S3). When the difference (TC1-TC2) between TC1 and TC2 is equal to or greater than a preset reference temperature difference Ta, the combustion section 16 is forcibly misfired (S11). By this forced misfire, the temperature rise of the combustion part 16 is suppressed. This reference temperature difference Ta is a temperature that is taken into consideration from the resistance of the members constituting the combustion section 16 and the reforming section 17. In addition, in the case of containment with raw fuel, in order to prevent catalytic oxidation, the combustion section 16 is forcibly misfired even when TC2 exceeds the temperature Tb at which carbon is deposited by pyrolysis of the raw fuel. May be.

  When the combustion unit 16 is forcibly misfired (S11), the process returns to the burner air purge (S1). At this time, after confirming that the temperature of the temperature TC2 measured by the second thermometer 62 has decreased, the ignition is performed again (S2), and the temperature is again increased.

  The reference temperature difference Ta varies depending on the mounting positions of the first thermometer 61 and the second thermometer 62 and the material of the constituent members. The reference temperature difference Ta can be obtained as follows.

  First, a test for repeatedly applying a certain temperature difference between the partition plate 22 and the outer wall 21 is performed. Thereby, it is possible to obtain the number of repetitions until the partition plate 22 and the outer wall 21 are damaged due to fatigue caused by a difference in thermal expansion due to a certain temperature difference. By performing such a test for a plurality of temperature differences, the dependency of the number of repetitions until breakage on the temperature difference can be obtained. If the number of temperature increases and decreases assumed during the life of the fuel cell is known, the temperature difference between the partition plate 22 and the outer wall 21 that does not cause damage may be set as the reference temperature difference Ta. Or when replacing | exchanging the hydrogen production | generation apparatus 10 rather than the lifetime of the whole fuel cell system, you may consider the replacement frequency.

  In a test in which a thermal load is repeatedly applied, it is not always necessary to repeat the process until breakage occurs. In such a case, first, the member is disassembled, and the length of the crack that has developed in the member by the fracture surface inspection is measured. Therefore, from the length of the crack measured, it is possible to estimate the number of thermal loads that lead to breakage, that is, until the crack grows by the thickness of the member.

  By such a test, for example, the first thermometer 61 is provided at the location where the temperature of the partition plate 22 of the reformer 11 is highest, the second thermometer 62 is provided at the outlet of the reforming catalyst 23, and the partition plate 22 is provided. When a stainless steel SUS310S (JIS standard) material is used for the outer wall 21, the reference temperature difference Ta is about 150 ° C to 250 ° C.

  When the controller 60 performs control so as to reduce the amount of heat generated in the combustion section 16 when the temperature difference becomes the reference temperature difference Ta, this temperature difference temporarily exceeds the reference temperature difference. Therefore, in such a case, an appropriate margin is provided for the reference temperature difference.

  Alternatively, a target temperature difference that is lower than the reference temperature difference Ta by a certain margin may be set, and the controller 60 may be controlled to approach the target temperature difference. That is, the difference between the temperature TC1 measured by the first thermometer 61 installed in the combustion unit 11 and the temperature TC2 measured by the second thermometer installed in the reforming unit 12 (TC1-TC2) with respect to the target temperature difference. Proportional control may be performed so that the amount of heat generated by the combustion unit 16 is proportional.

  The first temperature raising step is continued while determining (S4) until the temperature of the reforming catalyst 23 reaches a temperature that does not condense even if steam purge is performed, for example, 100 ° C. or higher. When the temperature of the reforming catalyst 23 finally reaches such a temperature, the reforming water pump operates and introduction of the reforming water into the steam generator 14 is started (S5).

  When the introduction of the reforming water is started and steam is generated by the steam generation 14, and the steam purge of the reforming catalyst 23 is completed, the restriction of the temperature Tb at which carbon is deposited by thermal decomposition is removed. Therefore, ignition is performed again (S6), and the process proceeds to the second temperature raising step (S6 to S9, S21, S22).

  In the second temperature raising step, the temperature rise is continued while determining whether or not the temperature TC2 of the reforming unit 17 has reached a temperature suitable for the reforming reaction of about 600 to 700 ° C. (S8). Even during the second temperature raising step, the temperature difference between the temperatures TC1 and TC2 is always monitored (S7). When the difference (TC1-TC2) between TC1 and TC2 is equal to or greater than the reference temperature difference Ta, the burner is misfired (S21), burner air purge is performed (S22), and then ignition is performed again (S6).

  In this manner, the temperature increase is completed when the temperature of each fuel processing catalyst including the reforming catalyst 23 reaches a temperature suitable for the reaction. When the temperature rise is completed, introduction of raw fuel from the raw fuel supplier 40 is started (S9). Thus, the raw fuel is mixed with the steam generated from the steam generator 14 and then supplied to the reforming unit 17 to cause a reforming reaction. When hydrogen is generated by the reforming reaction, the power generation operation is started.

  Thus, in this Embodiment, the hydrogen generator 10 can be started so that an excessive thermal stress may not be generated. Moreover, it is not necessary to use a special material with high heat resistance or to have a complicated structure. For this reason, it is possible to prevent excessive thermal stress from being generated in the hydrogen generator of the fuel cell system without excessively increasing the manufacturing cost. As a result, the possibility of damage to the hydrogen generator 10 can be suppressed. Therefore, an inexpensive and highly durable hydrogen generator and a fuel cell system using the same can be provided.

  During the first or second temperature raising step, the difference (T1) between the temperature TC1 measured by the first thermometer 61 installed in the combustion section 16 and the temperature TC2 measured by the second thermometer 62 installed in the reforming section 17 -T2) may be monitored to adjust the flow rate of air or burner fuel supplied to the combustion section 16 so that this temperature difference does not exceed the reference temperature difference Ta. By performing control so that the temperature difference does not exceed the reference temperature difference Ta in this way, it is not necessary to cause the combustion unit 16 to forcibly misfire. As a result, the number of repetitions of ignition and misfire can be reduced, and the temperature raising time can be shortened.

DESCRIPTION OF SYMBOLS 10 ... Hydrogen generator, 11 ... Reformer, 12 ... Carbon monoxide converter, 13 ... Carbon monoxide remover, 14 ... Steam generator, 16 ... Combustion part, 17 ... Reformation part, 21 ... Outer wall, 22 DESCRIPTION OF SYMBOLS ... Partition plate 23 ... Reforming catalyst 24 ... Inlet port 25 ... Discharge port 30 ... Air supply device 31 ... Burner fuel supply device 32 ... Discharge pipe 40 ... Raw fuel supply device 41 ... Reformed water Feeder 51 ... first heat exchanger 52 ... second heat exchanger 60 ... controller 61 ... first thermometer 62 ... second thermometer 63 ... burner fuel regulating valve 64 ... burner air regulation Valve, 70 ... Fuel cell

Claims (8)

A reforming section containing a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam surrounded by an outer wall and a partition plate fixed to the outer wall;
A combustion section that faces the partition plate and generates heat;
A temperature difference measuring means for measuring a temperature difference between a point on the combustion part side of the partition plate and a point inside the reforming part;
When the temperature difference becomes greater than or equal to a predetermined value at startup, the temperature difference is controlled to be equal to or less than a predetermined value while reducing the amount of heat generated per unit time of the combustion unit until the catalyst reaches a predetermined temperature. Temperature difference control means for heating the catalyst by generating heat in the combustion section;
A hydrogen generator characterized by comprising: The combustion section is supplied with hydrocarbon fuel and burns the hydrocarbon fuel,
The temperature difference control means includes fuel adjustment means for changing the amount of hydrocarbon fuel supplied to the combustion unit per unit time.
The hydrogen generator according to claim 1.   The fuel adjusting means includes at least one of a flow rate adjusting valve for adjusting the flow rate of the hydrocarbon fuel supplied to the combustion unit and a shut-off valve for shutting off the hydrocarbon fuel supplied to the combustion unit. The hydrogen generator according to claim 2.   4. The hydrogen generation apparatus according to claim 2, wherein the temperature difference control unit includes an air adjustment unit that changes an amount of air supplied to the combustion unit per unit time. 5.   5. The air adjusting unit includes at least one of a flow rate adjusting valve and a blower for adjusting a flow rate of air supplied to the combustion unit, and a cutoff valve for blocking air supplied to the combustion unit. The hydrogen generator described. A fuel cell;
A reforming part that is surrounded by an outer wall and a partition plate fixed to the outer wall and contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam, and is provided facing the partition plate to generate heat. A temperature difference measuring means for measuring a temperature difference between the combustion part, a point on the combustion part side of the partition plate and a point inside the reforming part, and when the temperature difference becomes a predetermined value or more at start-up A temperature difference control means for controlling the temperature difference to a predetermined value or less while reducing the amount of heat generated per unit time of the combustion unit, and heating the catalyst by causing the combustion unit to generate heat until the catalyst reaches a predetermined temperature. And a hydrogen generator for supplying hydrogen to the fuel cell,
A fuel cell system comprising: Combustion that is surrounded by an outer wall and a partition plate fixed to the outer wall and contains a reforming unit that contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam, and that faces the partition plate and generates heat A start-up method of a hydrogen generator comprising:
A temperature difference measuring step of measuring a temperature difference between a point on the combustion part side of the partition plate and a point inside the reforming part;
A heating step of heating the catalyst by causing the combustion section to generate heat until the catalyst reaches a predetermined temperature;
A calorific value reduction step of reducing the calorific value per unit time of the combustion part when the temperature difference becomes a predetermined value or more;
A start-up method for a hydrogen generator characterized by comprising: Combustion that is surrounded by an outer wall and a partition plate fixed to the outer wall and contains a reforming unit that contains a catalyst that causes a steam reforming reaction between hydrocarbon fuel and steam, and that faces the partition plate and generates heat In a starting method of a fuel cell system comprising a hydrogen generator and a fuel cell comprising:
A temperature difference measuring step of measuring a temperature difference between a point on the combustion part side of the partition plate and a point inside the reforming part;
A heating step of heating the catalyst by causing the combustion section to generate heat until the catalyst reaches a predetermined temperature;
A calorific value reduction step of reducing the calorific value per unit time of the combustion part when the temperature difference becomes a predetermined value or more;
A raw fuel supply step of supplying raw fuel to the reforming section when the catalyst is at a predetermined temperature or higher;
A starting method for a fuel cell system, comprising:

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