JP3671752B2 - Mobile fuel cell system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel cell system for a mobile body, and more particularly to a method for generating a mixed steam having a composition required for a fuel reformer.
[0002]
[Prior art]
As a conventional mobile fuel cell system, for example, the one described in Japanese Patent Application Laid-Open No. 8-91804 has been reported.
[0003]
This is a problem in the case where water necessary for fuel reforming is stored in a water tank, that is, a mobile fuel cell system placed in a cold region, specifically in an environment below freezing point, is started. At the same time, enormous heat energy was required for thawing and warming up the water system such as water, water tank, water piping, and water valves.
[0004]
For this reason, it is necessary to solve the problem that not only the efficiency including the start and stop of the fuel cell system is lowered, but also the start-up time is lengthened and the practicality may be impaired.
[0005]
For this reason, instead of the water tank, a mixed liquid tank for storing a mixed liquid of water and methanol is provided, and the composition of the mixed liquid (mixing ratio of methanol and water) in the mixed liquid tank is a predetermined value, specifically In particular, the composition of the mixed gas required by the fuel reformer is controlled so that it can withstand use in cold regions.
[0006]
[Problems to be solved by the invention]
However, in such a conventional mobile fuel cell system, when a mixed liquid having the same composition as the mixed gas required by the fuel reformer is supplied to the evaporator, water is transiently transferred. There was a problem that a mixed gas containing a large amount of fuel was generated.
[0007]
Fig. 7 (a) shows the amount of steam required by the fuel reformer, Fig. 7 (b) shows the injection amount of the mixed liquid supplied to the evaporator, and Fig. 7 (c) shows the generation of steam generated by the evaporator. Each amount is shown. In particular, as can be seen from FIG. 7 (c), in the evaporator, time τ is required until the mixed steam having the steam composition required in the fuel reformer is obtained. And the composition of the mixed steam generated at the initial stage of supplying the mixed liquid is such that the fuel (methanol vapor) is large and the water (water vapor) is small.
[0008]
For this reason, when the mixed gas with a small amount of water and a large amount of fuel is supplied to the fuel reformer, the fuel cell cannot generate a reformed gas containing a necessary amount of hydrogen in the fuel reformer. There is a problem that sufficient electric power cannot be generated and the driver of the moving body cannot follow the accelerator operation.
[0009]
Further, since the hatching reaction is likely to occur, there is a problem that the activity of the catalyst in the fuel reformer is lowered and the flow path is blocked in some cases.
[0010]
Furthermore, in some cases, a part of the fuel is discharged from the fuel reformer without being reformed, and there is a problem that the characteristics of the fuel cell are deteriorated.
[0011]
The present invention has been made in view of the above, and as an object thereof, it is possible to always generate a mixed steam having a composition required in a fuel reformer, thereby improving power generation efficiency and extending the life of the system. It is an object of the present invention to provide a fuel cell system for a moving body.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes a fuel reformer that reforms fuel using water, a reformed gas containing hydrogen reformed by the fuel reformer, and oxygen. A fuel cell that generates electricity using gas, a water recovery unit that recovers water from exhaust gas discharged from the fuel cell, a fuel tank that stores fuel, and water recovered by the water recovery unit; Necessary for the fuel reformer in a fuel cell system for a mobile body, comprising: a liquid mixture tank for storing a liquid mixture with fuel in the fuel tank; and an evaporator for evaporating the liquid mixture in the liquid mixture tank. When the required amount of the mixed gas composed of water and fuel is increased, the liquid composition of water and fuel supplied to the evaporator is changed to the composition of the mixed gas required in the fuel reformer. The idea is to temporarily adjust the composition to an excess of water rather than To.
[0013]
In order to solve the above-mentioned problem, the invention according to claim 2 makes the composition of the liquid mixture in the liquid mixture tank more water than the composition of the mixed gas required in the fuel reformer, and The liquid mixture in the liquid mixture tank and the fuel in the fuel tank are supplied to the evaporator, and the required amount of the mixed gas composed of water and fuel required in the fuel reformer is When increasing, the fuel reformer needs the liquid composition of water and fuel supplied to the evaporator by temporarily limiting the flow rate to the fuel supplied from the fuel tank to the evaporator. The gist is to temporarily adjust the composition to an excess of water rather than the composition of the mixed gas.
[0014]
In order to solve the above-mentioned problem, the invention according to claim 3 makes the composition of the mixed solution in the mixed solution tank the same as the composition of the mixed gas required in the fuel reformer, and the mixed solution tank The mixed liquid is supplied to the evaporator, and when the required amount of the mixed gas composed of water and fuel required by the fuel reformer increases, it is recovered by the water recovery unit. By temporarily supplying the recovered water to the evaporation section, the liquid composition of the water and fuel supplied to the evaporator is more temporary than the composition of the mixed gas required by the fuel reformer. The main point is to adjust the composition to an excess of water.
[0015]
【The invention's effect】
According to the first aspect of the present invention, when the required amount of the mixed gas composed of water and fuel required in the fuel reformer is increased, the liquid composition of water and fuel supplied to the evaporator is increased. By adjusting the gas to a composition that is temporarily water-excessive than the composition of the gas mixture required for the fuel reformer, it is possible to always generate a mixed steam having the composition required for the fuel reformer. Therefore, it is possible to improve the power generation efficiency and extend the life of the system.
[0016]
According to the second aspect of the present invention, when the required amount of the mixed gas comprising water and fuel required in the fuel reformer increases, the liquid composition of the water and fuel supplied to the evaporator the mixture, as a means for adjusting the temporary water excess of composition than the composition of the mixed gas required by the fuel reformer, which is required for the composition of the mixture of the mixed liquid in the tank in a fuel reformer The water and fuel required by the fuel reformer are set such that the composition of the water is greater than that of the gas , and the mixed liquid in the mixed liquid tank and the fuel in the fuel tank are supplied to the evaporator. When the required amount of the mixed gas consisting of is increased, the flow rate of the fuel supplied from the fuel tank to the evaporation unit is temporarily limited, whereby the liquid composition of water and fuel supplied to the evaporator is changed to the fuel. Temporarily adjust the water-excess composition to the composition of the gas mixture required by the reformer And, in a relatively simple configuration, the fuel reformer can always generate a mixed vapor of composition required in, can be improved and the life of the system the power generation efficiency.
[0017]
According to the third aspect of the present invention, when the required amount of the mixed gas composed of water and fuel required in the fuel reformer increases, the liquid composition of water and fuel supplied to the evaporator the mixture, as a means for adjusting the temporary water excess of composition than the composition of the mixed gas required by the fuel reformer, which is required for the composition of the mixture of the mixed liquid in the tank in a fuel reformer By making the gas composition the same and supplying the mixed liquid in the mixed liquid tank to the evaporator, the required amount of the mixed gas composed of water and fuel required by the fuel reformer increases. In this case, the liquid composition of water and fuel supplied to the evaporator is changed to a mixed gas required by the fuel reformer by temporarily supplying the recovered water recovered by the water recovery unit to the evaporation unit. The composition of the composition required by the fuel reformer is adjusted by temporarily adjusting the excess water composition to the composition of the fuel reformer. Can always generate steam, it is possible to improve the life of the system in power generation efficiency can be improved cold resistance.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
(First embodiment)
FIG. 1 is a diagram showing a configuration of a mobile fuel cell system according to a first embodiment of the present invention. Here, a fuel cell system mounted on a fuel cell vehicle is taken as an example of the fuel cell system for a moving body. In particular, the system of FIG. 1 is the case of a hybrid fuel cell vehicle with a fuel cell system having a fuel reformer and a battery.
[0020]
In FIG. 1, a fuel reformer 1 steam reforms methanol, which is a fuel, using water to generate a reformed gas containing hydrogen. At this time, depending on the case, air is sent from the compressor 15 and reforming by partial oxidation of methanol is also performed. Steam reforming is an endothermic reaction and partial oxidation is an exothermic reaction.
[0021]
The reformed gas generated in the fuel reformer 1 and the air from the compressor 15 are sent to the respective electrodes of the anode and cathode of the fuel cell 3, where hydrogen in the reformed gas and oxygen in the air are combined. Electricity is generated using this. At this time, the hydrogen in the reformed gas and the oxygen in the air are not all consumed in the fuel cell 3 but are exhausted while leaving a part, and are passed through the capacitor 5 as exhausted reformed gas and exhausted air. And is combusted together with air from the compressor 15 and methanol in the methanol tank 7 in some cases. The heat of the combustion reaction in the combustor 13 is reused as a heat source for the evaporator 11 that evaporates methanol and water and as a heat source for the endothermic reaction of the steam reforming in the fuel reformer 1.
[0022]
The condenser 5 functions as a water recovery device, and cools the exhaust reformed gas and exhaust air, which are exhaust of the fuel cell, with cooling water, and condenses and collects the water vapor contained in the exhaust reformed gas and exhaust air. To do. The recovered water recovered by the condenser 5 is sent to the mixed liquid tank 9.
[0023]
The mixed liquid tank 9 is a tank for storing a mixed liquid of methanol and water as fuel. Methanol is supplied from a methanol tank (fuel tank) 7 for storing methanol liquid, and water is supplied from the capacitor 5 as described above. The mixed liquid in the mixed liquid tank 9 is supplied to the evaporator 11, evaporated to be a mixed gas of methanol vapor and water vapor, and sent to the fuel reformer 1. Further, the methanol in the methanol tank 7 is also supplied directly to the evaporator 11.
[0024]
Here, the methanol supply amount (injection amount) supplied from the methanol tank 7 to the evaporator 11 is measured by the flow meter 17, and the mixed solution supply amount (injection amount) supplied from the mixture tank 9 to the evaporator 11. Is measured by the flow meter 19. The flow meters 17 and 19 are connected to a control unit 21 for controlling the fuel cell system, and output respective measurement signals to the control unit 21.
[0025]
The control unit 21 includes a control ROM that stores therein a control program and a required injection amount characteristic function, and a RAM that serves as a work area during control. The control unit 21 receives measurement signals (feedback signals) from the flow meters 17 and 19. The control signal is flow-controlled so that the liquid injection amount (mixed liquid injection amount from the mixed liquid tank 9 and methanol injection amount from the methanol tank 7) matches the predetermined required injection amount function. Output to valves 23 and 25 (feedback control).
[0026]
The methanol supply amount (injection amount) supplied from the methanol tank 7 to the evaporator 11 is adjusted by the flow rate control valve 23, and the liquid mixture supply amount supplied from the liquid mixture tank 9 to the evaporator 11 by the flow rate control valve 25. (Injection amount) is adjusted. The flow control valves 23 and 25 and the flow meters 17 and 19 may be of an integral structure (flow control valve with flow meter).
[0027]
The battery 27 accumulates surplus power generated by the fuel cell 3 and regenerative power generated by the motor 29 when the fuel cell vehicle decelerates, travel power consumed by the motor 29, the compressor 15, and the fuel reformer 1. If the fuel cell 3 does not generate enough power to cover the auxiliary power consumed by the combustor 13, the fuel cell 3 is discharged to discharge the motor 29 and auxiliary equipment (compressor 15, fuel reformer 1, combustion Power supply to the device 13 and the like) to compensate for the insufficient power. These power distributions are performed via the power regulator 31. The control device 33 controls power distribution by the power adjuster 31 based on a signal obtained by detecting the depression amount (accelerator opening) of the accelerator pedal 35 by the position sensor 37.
[0028]
Next, with reference to the required injection amount characteristic function shown in FIG. 2, the liquid injection amount control operation to the evaporator 11 for always generating the mixed steam having the composition required by the fuel reformer 1 will be described.
[0029]
In the first embodiment, as described above, the liquid mixture of water and methanol stored in the mixed liquid tank 9 and the methanol stored in the methanol tank 7 are supplied to the evaporator 11. . The composition of the mixed liquid in the mixed liquid tank 9 (mixing ratio of methanol and water) is an appropriate constant composition (mixing ratio) in which the water is in excess of the composition of the mixed gas required in the fuel reformer 1. Has been adjusted.
[0030]
The adjustment of the composition of the liquid mixture in the liquid mixture tank 9 is performed by, for example, providing means for measuring the mixing ratio of methanol and water (such as a specific gravity sensor and a temperature sensor) to accurately measure the composition of the liquid mixture. This is done by adjusting the amount of water recovered from the condenser 5 and / or methanol flowing from the methanol tank 7 flowing into the mixed liquid tank 9 so that the measured value becomes a predetermined value.
[0031]
Here, the injection amount of the liquid into the evaporator 11 with respect to the required steam amount of the fuel reformer 1 shown in FIG. 7A is controlled according to the characteristic function shown in FIG.
[0032]
In the section b shown in FIG. 2, the total amount of methanol injected from the methanol tank 7 to the evaporator 11 and the methanol contained in the liquid mixture injected from the liquid mixture tank 9 to the evaporator 11 are mixed and mixed. The composition ratio (mixing ratio) with the amount of water contained in the mixed liquid injected from the liquid tank 9 into the evaporator 11 becomes the same as the composition ratio of the mixed gas required in the fuel reformer 1. Yes.
[0033]
Further, in the initial stage when the liquid injection amount is increased with the increase of the required steam amount in the fuel reformer 1, that is, in the section a shown in FIG. 2, the methanol from the methanol tank 7 to the evaporator 11 is increased. By temporarily suppressing the supply amount of methanol, the total amount of methanol injected into the evaporator 11 from the methanol tank 7 and the methanol contained in the mixed solution injected into the evaporator 11 from the mixed solution tank 9 And the composition ratio of the amount of water contained in the mixed liquid injected into the evaporator 11 from the mixed liquid tank 9 is temporarily larger than the composition ratio of the mixed gas required in the fuel reformer 1. The composition is excessive.
[0034]
Note that the control here is normal feedback control as described above, and a measurement signal (feedback signal) from the flowmeters 17 and 19 is input to the control unit 21 to inject the liquid into the evaporator 11. A control signal is sent from the control unit 21 to the flow rate control valves 23 and 25 so that (mixed liquid injection amount from the mixed liquid tank 9 and methanol injection amount from the methanol tank 7) matches the required injection amount function shown in FIG. This is done by outputting.
[0035]
Next, the operation will be described.
[0036]
FIG. 3 shows the relationship between the vapor composition (mol% of methanol) and the composition of the mixed liquid (mol% of methanol) when a large amount of mixed liquid of water and methanol is evaporated by the storage type evaporator 11. FIG.
[0037]
For example, when it is desired to generate a vapor having a methanol composition of 50 mol 1% as the vapor composition, it is necessary to make the composition of methanol in the mixed solution about 13 mol%, that is, an excess water composition from FIG.
[0038]
Accordingly, in FIG. 7C, the time τ until the mixed gas having the same composition as that of the mixed liquid injected into the evaporator 11 is generated for the liquid film formed on the vaporization heat transfer surface of the evaporator 11. It can be considered as the time from when methanol evaporates until an excessive liquid film of water is formed.
[0039]
Therefore, according to the required injection amount characteristic function shown in FIG. 2, since the liquid is supplied to the evaporator 11 with an excessive water composition in the initial section a, the above-mentioned excessive liquid film is rapidly formed. Thereafter, the liquid is supplied in an amount that compensates for the evaporation of methanol and water, so that the mixed gas having the composition required by the fuel reformer 1 can be quickly evaporated.
[0040]
As a result, as an effect related to the first embodiment, when the required steam amount in the fuel reformer 1 increases, the flow rate of methanol supplied from the methanol tank 7 to the evaporator 11 is temporarily limited. (See FIG. 2), the composition ratio of methanol and water supplied to the evaporator 11 is temporarily set to an excess water composition compared to the composition ratio of the mixed gas required in the fuel reformer 1. The mixed steam having the composition required by the fuel reformer 1 can always be generated, and the power generation efficiency of the fuel cell system can be improved. At the same time, since the fuel cell 3 can generate sufficient electric power, it is possible to follow the accelerator operation of the driver of the moving body.
[0041]
Further, since the generation of a mixed gas having a high composition of methanol (fuel) is prevented, the hatching reaction is less likely to occur, and the catalyst activity in the fuel reformer 1 can be prevented from being lowered and the flow path can be blocked. The life of the fuel reformer 1 can be improved. At the same time, part of the fuel is not discharged from the fuel reformer 1 without being reformed, so that the characteristic deterioration of the fuel cell 3 can be prevented and the life of the fuel cell 3 can be improved. . That is, the life of the fuel cell system can be extended.
[0042]
(Second Embodiment)
FIG. 4 is a diagram showing a configuration of a mobile fuel cell system according to a second embodiment of the present invention. The second embodiment has the same basic configuration as the mobile fuel cell system corresponding to the first embodiment shown in FIG. 1, and the same reference numerals are used for the same components. The description will be omitted.
[0043]
The feature of the second embodiment is that, as shown in FIG. 4, a mixed liquid of water and methanol stored in the mixed liquid tank 9 and recovered water recovered by the condenser 5 are supplied to the evaporator 11. It is to supply.
[0044]
The recovered water supply amount (injection amount) supplied from the condenser 5 to the evaporator 11 is measured by the flow meter 39 and the flow rate is adjusted by the flow rate control control valve 41. The flow meter 39 is connected to the control unit 21 for controlling the fuel cell system, and sends a measurement signal to the control unit 21.
[0045]
The control unit 21 stores a control program and a required injection amount characteristic function in an internal control ROM, inputs measurement signals (feedback signals) from the flow meters 19 and 39, and injects liquid into the evaporator 11. A control signal is output to the flow control valves 25 and 41 so that the amount (mixed liquid injection amount from the mixed liquid tank 9 and water injection amount from the condenser 5) matches a predetermined required injection amount function (feedback control). .
[0046]
Here, the composition of the mixed liquid in the mixed liquid tank 9 (mixing ratio of methanol and water) is made the same as the composition of the mixed gas required in the fuel reformer 1.
[0047]
Then, the injection amount of the liquid into the evaporator 11 with respect to the required steam amount of the fuel reformer 1 shown in FIG. 7A is controlled according to the characteristic function shown in FIG. In section d shown in FIG. 5, the recovered water is not supplied from the condenser 5 to the evaporator 11, but only the mixed liquid in the mixed liquid tank 9 is supplied to the evaporator 11, so that methanol and water supplied to the evaporator 11 are supplied. Is the same as the composition ratio of the mixed gas required in the fuel reformer 1.
[0048]
In addition, in the initial stage when the liquid injection amount is increased with the increase in the required steam amount in the fuel reformer 1, that is, in the section c shown in FIG. Is temporarily supplied, the injection amount of methanol contained in the liquid mixture injected into the evaporator 11 from the liquid mixture tank 9 and the water contained in the liquid mixture injected into the evaporator 11 from the liquid mixture tank 9. And the recovered water injected from the condenser 5 into the evaporator 11, the composition ratio of the total water injection amount is temporarily larger than the composition ratio of the mixed gas required in the fuel reformer 1. It has a composition.
[0049]
The control here is also normal feedback control as described above, and the measurement signal (feedback signal) from the flow meters 19 and 39 is input to the control unit 21 to inject the liquid into the evaporator 11. The control signal is sent from the control unit 21 to the flow control valves 25 and 41 so that the amount (mixed liquid injection amount from the mixed liquid tank 9 and the recovered water injection amount from the condenser 5) matches the required injection amount function shown in FIG. This is done by outputting to
[0050]
As a result, also in the second embodiment, it becomes possible to quickly evaporate the mixed gas having the composition required in the fuel reformer 1 for the same reason as described in the first embodiment. The effects related to the first embodiment described above can be obtained.
[0051]
Furthermore, in the second embodiment, the cold resistance is improved because the composition of the liquid mixture in the liquid mixture tank 9 is rich in methanol (fuel) as compared to the first embodiment. That is, FIG. 6 shows the relationship between the composition of the liquid mixture (mol% of methanol) and the freezing point. From this figure, for example, the mixed gas of methanol and water required by the fuel reformer 1 is shown. Assuming that the composition is 50 mo 1%, in the first embodiment, the composition of the mixed liquid in the mixed liquid tank 1 is approximately 13 mol in which water is in excess of the composition of the mixed gas required by the fuel reformer 1. (See FIG. 3) and the freezing point is about −15 ° C., whereas in the second embodiment, the freezing point is 50 mol% which is the same as the composition of the mixed gas required by the fuel reformer 1, and the freezing point Is about -90 ° C.
[0052]
It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention described in the claims. Hereinafter, the example of a change is demonstrated.
[0053]
In the first and second embodiments, the case where the amount of steam required in the fuel reformer 1 increases stepwise from 0 has been described as an example (see FIG. 7A). It is not limited. For example, the present invention can be applied even when increasing from a certain amount to a certain amount in a stepped manner or when increasing in a ramp shape instead of a stepped shape. Further, the amount of steam required by the fuel reformer 1 may be read as the load of the fuel reformer 1.
[0054]
In the first embodiment, the function for increasing the injection amount of methanol in a ramp shape in the initial section a when the amount of steam required in the fuel reformer 1 increases has been described as an example. (See FIG. 2), but is not limited to this function. It is only necessary to supply methanol (fuel) and water so that the water becomes excessive in the initial section a when the amount of steam required in the fuel reformer 1 increases. May be delayed, or may be ramped after being delayed in time. This point is the same in the second embodiment, and is not limited to this function.
[0055]
In the first and second embodiments, the case where the composition of the mixed steam required in the fuel reformer 1 is always constant has been described as an example (see FIG. 7A). It is not limited to. When the load of the fuel reformer 1 increases, a mixed gas composition that excessively contains water temporarily is required, or when the composition of the mixed gas is corrected by the load or temperature of the fuel reformer 1, The present invention is applicable.
[0056]
In the first and second embodiments, the liquid mixture supplied to the evaporator 11 and methanol (fuel) or recovered water are mixed immediately before the injector that injects these liquids into the evaporator 11. Alternatively, each may be injected and mixed in an atomized state with an injector, or in some cases mixing by boiling.
[0057]
In particular, in the second embodiment, since there is a water supply line for supplying the recovered water collected by the condenser 5 to the evaporator 11, as a countermeasure against freezing in a sub-freezing environment, the water supply line is used when the system is stopped. A mechanism may be provided such as draining the water or injecting methanol (fuel) into the water supply line.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a mobile fuel cell system according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a required injection amount characteristic function of the first embodiment.
FIG. 3 is a diagram showing a relationship between a vapor composition and a mixed liquid composition when a mixed liquid of water and methanol is evaporated by an evaporator.
FIG. 4 is a diagram showing a configuration of a mobile fuel cell system according to a second embodiment of the present invention.
FIG. 5 is a diagram showing a required injection amount characteristic function of the second embodiment.
FIG. 6 is a diagram showing the relationship between the composition of a mixed solution and the freezing point.
FIG. 7 is a diagram for explaining a problem of the prior art.
[Explanation of symbols]
1 Fuel reformer 3 Fuel cell 5 Capacitor (water recovery device)
7 Methanol tank (fuel tank)
9 Mixture tank 11 Evaporator 13 Combustor 15 Compressor 17, 19, 39 Flow meter 21 Control unit 23, 25, 41 Flow control valve 27 Battery 29 Motor 31 Power regulator 33 Controller 35 Accelerator pedal 37 Position sensor

Claims (3)

A fuel reformer that reforms the fuel using water; and
A fuel cell that generates electric power using a reformed gas containing hydrogen and a gas containing oxygen reformed by the fuel reformer ;
A water recovery device for recovering water from the exhaust gas discharged from the fuel cell;
A fuel tank for storing fuel;
A mixed liquid tank for storing a mixed liquid of water recovered by the water recovery device and fuel in the fuel tank;
In the fuel cell system for a moving body, comprising an evaporator for evaporating the liquid mixture in the liquid mixture tank,
When the required amount of the mixed gas composed of water and fuel required in the fuel reformer increases, the liquid composition of water and fuel supplied to the evaporator is required in the fuel reformer. The mobile fuel cell system is characterized in that the composition is temporarily adjusted to a water-excess composition rather than the composition of the mixed gas. The composition of the liquid mixture in the liquid mixture tank is set to a composition in which water is in excess of the composition of the gas mixture required in the fuel reformer, and the liquid mixture in the liquid mixture tank and the fuel in the fuel tank Is supplied to the evaporator, and when the required amount of the mixed gas composed of water and fuel required by the fuel reformer increases, the fuel tank supplies the evaporator to the evaporator. By temporarily restricting the flow rate to the fuel, the liquid composition of water and fuel supplied to the evaporator is temporarily in excess of the mixed gas composition required by the fuel reformer. The fuel cell system for a moving body according to claim 1, wherein the fuel cell system is adjusted to a composition. The composition of the mixed liquid in the mixed liquid tank is made the same as the composition of the mixed gas required in the fuel reformer, and the mixed liquid in the mixed liquid tank is supplied to the evaporator. When the required amount of the mixed gas composed of water and fuel required by the fuel reformer increases, the recovered water recovered by the water recovery unit is temporarily supplied to the evaporation unit The liquid composition of water and fuel supplied to the evaporator is temporarily adjusted to an excess water composition compared to the composition of the mixed gas required in the fuel reformer. The fuel cell system for a mobile body according to 1.

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