JP2006310018A - Fuel gas supply device for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel gas supply device for fuel cell capable of coping with various operating states and enhancing the responsiveness with respect to the demanded output. <P>SOLUTION: The fuel gas supply device for fuel cell has a fuel tank 30 storing fuel gas in pressurized state; a fuel gas supplying flow passage 13 supplying the fuel gas from the fuel tank to an anode electrode by connecting the fuel tank and the anode electrode; a regulator 5 arranged on the fuel gas supplying flow passage, adjusting the supply pressure of the fuel gas to an anode electrode in accordance with a signal pressure; a signal pressure imposed gas supplying flow passage 14, branched from the fuel gas supply flow passage and connected to a signal pressure chamber of the regulator at upper stream side of the regulator, supplying the fuel gas as signal pressure imposed gas; and a signal pressure adjusting means 16 adjusting the signal pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel gas supply device for a fuel cell having a regulator that adjusts an anode supply pressure of the fuel cell based on a signal pressure.

As an example of a fuel cell system mounted on a fuel cell vehicle or the like, an oxidant gas is supplied to the cathode electrode of the fuel cell, and a fuel gas is supplied to the anode electrode of the fuel cell, and the electrochemical reaction of these gases. There is known a system for obtaining a power generation output by means of the above.
By the way, there is a system having a regulator for adjusting the pressure of the anode electrode when generating power with a fuel cell. For example, in Patent Document 1, in order to automatically adjust the pressure of the fuel gas supplied to the anode electrode via a regulator, the pressure of the oxidant gas supplied to the cathode electrode is controlled by a control device, A technique for adjusting the signal pressure to the regulator has been proposed (see Patent Document 1).
JP 2002-373682 A

However, in the conventional technology, the signal pressure to the regulator is determined based on the pressure of the oxidant gas supplied to the cathode electrode, and the pressure of the fuel gas supplied to the anode electrode is the pressure of the oxidant gas. Will be limited by. Therefore, in a state where the pressure of the fuel gas is to be increased and the required output is low and the pressure of the oxidant gas is low, the pressure of the fuel gas remains low, and as a result, the operation of the fuel cell is limited. There is a problem. On the other hand, when the signal pressure based on the pressure of the oxidant gas is rapidly increased or the regulation ratio is increased, the size of the compressor or regulator is increased, and the cost and installation space are greatly increased. In particular, when it is mounted in a limited space such as a vehicle, it is not realistic to increase the size of the compressor or regulator.
An object of this invention is to provide the fuel gas supply apparatus of the fuel cell which can respond to various driving | running states.

  According to the first aspect of the present invention, a fuel tank that stores fuel gas in a pressurized state (for example, the high-pressure hydrogen tank 30 in the embodiment) and the fuel tank and an anode electrode of a fuel cell are connected to each other, and the fuel A fuel gas supply channel (for example, a hydrogen supply pipe 13 in the embodiment) for supplying fuel gas from a tank to the anode electrode, and the fuel gas supply channel, are provided to the anode electrode based on a signal pressure. A fuel gas supply device for a fuel cell having a regulator for adjusting the supply pressure of the fuel gas of the fuel cell, and branched from the fuel gas supply flow channel upstream of the regulator and connected to the signal pressure chamber of the regulator, A signal for adjusting the signal pressure while forming a signal pressure applying gas supply channel (for example, the branch channel 14 in the embodiment) for supplying the gas as a signal pressure applying gas Adjusting means (e.g., opening control valve 16,45 in the embodiment, the orifice 34, 44), characterized in that it comprises a.

  According to this invention, since the signal pressure applied to the regulator is set by adjusting the signal pressure adjusting means based on the pressure of the fuel gas supplied in the pressurized state, the signal pressure is applied to the cathode electrode. The pressure of the fuel gas applied to the anode electrode can be adjusted without being limited by the pressure of the oxidant gas. Therefore, even if the required output is low and the pressure of the oxidant gas applied to the cathode electrode is low, the signal pressure is set based on the pressure of the fuel gas supplied in the pressurized state. When it is judged that the signal pressure is set high, the pressure of the fuel gas applied to the anode electrode can be increased. In addition, since the pressure of the fuel gas applied to the anode electrode can be adjusted without causing an increase in size of the compressor or regulator, it is possible to reduce the cost and installation space, which is particularly suitable for mounting on a vehicle. .

The invention according to claim 2 is the invention according to claim 1, wherein the signal pressure applying gas supply flow path is provided with an orifice constituting the signal pressure adjusting means.
According to this invention, since the flow rate of the fuel gas flowing through the signal pressure applying gas supply flow path can be limited by providing an orifice in the signal pressure applying gas supply flow path, a wider range of signal pressures can be set. Can be performed.

The invention according to claim 3 is the one according to claim 1 or 2, wherein the signal pressure applying gas discharge passage for discharging the signal pressure applying gas from the regulator (for example, the branch flow in the embodiment) The passages 15 and 41) are provided with an orifice (for example, the orifice 34 in the embodiment) constituting the signal pressure adjusting means.
According to the present invention, since the flow rate of the fuel gas flowing through the signal pressure applying gas discharge flow path can be limited by providing an orifice in the signal pressure applying gas discharge flow path, there is no fuel in the signal chamber of the regulator. The gas can be easily retained, and the signal pressure to the regulator can be supplied uniformly.

The invention according to claim 4 is the invention according to claim 3, characterized in that the signal pressure applying gas discharge passage is connected to the fuel gas supply passage.
According to this invention, the fuel gas, which is the signal pressure application gas provided to apply the signal pressure of the regulator, is supplied to the anode electrode of the fuel cell connected to the fuel gas supply flow path and used for power generation. This can contribute to improved fuel efficiency.

The invention according to claim 5 is the invention according to claim 4, wherein a circulation flow path for supplying the fuel gas discharged from the anode electrode to the anode electrode again is connected to the fuel gas supply flow path via an ejector. The signal pressure applying gas discharge passage (for example, the branch passage 41 in the embodiment) is connected to the fuel gas supply passage on the upstream side of the ejector.
According to the present invention, since the fuel gas that is the signal pressure application gas used for applying the signal pressure of the regulator can be supplied to the ejector, the circulation efficiency of the fuel gas by the ejector can be improved.

The invention according to claim 6 is the invention according to claim 4, wherein a circulation flow path for supplying the fuel gas discharged from the anode electrode to the anode electrode again is connected to the fuel gas supply flow path via an ejector. The signal pressure applying gas discharge passage (for example, the branch passage 15 in the embodiment) is connected to the fuel gas supply passage on the downstream side of the ejector.
According to the present invention, it is possible to suppress an increase in pressure on the upstream side of the ejector due to the fuel gas that is a signal pressure application gas provided to the signal pressure application of the regulator. Therefore, the pressure reduction control of the fuel gas supplied to the anode electrode Responsiveness can be improved.

  According to the first aspect of the present invention, it is possible to adjust the pressure of the fuel gas applied to the anode electrode without being limited by the pressure of the oxidant gas applied to the cathode electrode. It can correspond to. In addition, the cost and installation space can be reduced, which is particularly suitable for mounting on a vehicle.

According to the invention of claim 2, it is possible to set a wide range of signal pressures.
According to the invention which concerns on Claim 3, the signal pressure to a regulator can be supplied uniformly.
According to the invention which concerns on Claim 4, it can contribute to a fuel consumption improvement.
According to the invention which concerns on Claim 5, the circulation efficiency of the fuel gas by an ejector can be improved.
According to the invention which concerns on Claim 6, the responsiveness of pressure reduction control of the fuel gas supplied to an anode pole can be improved.

Embodiments of a fuel gas supply device for a fuel cell according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a fuel gas supply device for a fuel cell according to an embodiment of the present invention. The fuel cell 1 is configured by laminating a large number of cells each having an anode electrode and a cathode electrode on both sides of a solid polymer electrolyte membrane and gas passages for supplying a reaction gas to the outside of each electrode. .
The fuel cell 1 generates power by supplying hydrogen gas as a fuel gas to the anode electrode and supplying air as an oxidant gas to the cathode electrode.

  The air is pressurized by the air compressor 2, humidified by the cathode humidifier 3, supplied to the cathode electrode of the fuel cell 1, oxygen in the air is used as an oxidant, and then discharged from the fuel cell 1 as air off-gas. And released to the atmosphere via the pressure control valve 4. The ECU 10 drives the air compressor 2 to supply a predetermined amount of air to the fuel cell 1 and controls the pressure control valve 4 in accordance with the output required for the fuel cell 1 (hereinafter, required output). The air supply pressure at the cathode electrode is adjusted to a pressure corresponding to the required output of the fuel cell 1.

  On the other hand, the hydrogen gas released from the high-pressure hydrogen tank 30 is decompressed by the regulator 5, passes through the ejector 6, is humidified by the anode humidifier 7, and is supplied to the anode electrode of the fuel cell 1. After this hydrogen gas is used for power generation, it is discharged from the fuel cell 1 as hydrogen off-gas, sucked into the ejector 6 through the hydrogen off-gas recovery passage 11, and merged with the hydrogen gas supplied from the high-pressure hydrogen tank 30 again. The fuel cell 1 is supplied and circulated.

  The regulator 5 is composed of a proportional pressure control valve (see FIG. 2), and controls the pressure of hydrogen gas (signal pressure applying gas) supplied through the branch flow path 14 branched from the hydrogen supply pipe 13 on the high-pressure hydrogen tank 30 side. The pressure control is performed so that the pressure of the hydrogen gas at the outlet of the regulator 5 falls within a predetermined pressure range corresponding to the signal pressure.

The regulator 5 will be described with reference to the schematic sectional view of FIG.
The internal space of the body 21 of the regulator 5 is partitioned vertically by pressure regulating diaphragms 22a and 22b (22), and the space above the diaphragm 22a is a signal pressure chamber 23, which is located below the diaphragm 22b. The space is a hydrogen gas passage 24. The signal pressure chamber 23 is a sealed space having a signal pressure applying gas supply hole 25 on one side surface (in this case, the left side surface in FIG. 2), and is branched from the hydrogen supply pipe 13 on the upstream side of the regulator 5. It is introduced into the signal pressure chamber 23 from the signal pressure applying gas supply hole 25 through the flow path 14.
Further, the signal pressure chamber 23 is provided with a signal pressure applying gas discharge hole 36 on the other side surface (in this case, the right side surface in FIG. 2), and is connected to the signal pressure applying gas discharge hole 36 from the hydrogen supply pipe 13. The branched branch flow path 15 is connected to the regulator 5. Details of the branch channel 15 will be described later.

A stem 26 is attached to the lower surface of the diaphragm 22b. The stem 26 is provided with a valve body 27 that can be seated and separated from the valve seat portion 28 in the hydrogen gas passage 24 from above. The signal pressure chamber 23 is provided with a bias setting spring (elastic body) 29 that urges the valve body 27 in a direction away from the valve seat portion 28.
The body 21 has a hydrogen gas inlet 31 communicating with the hydrogen gas passage 24a on the side where the valve body 27 is disposed and a hydrogen gas outlet communicating with the hydrogen gas passage 24b on the side where the valve body 27 is not disposed. The hydrogen gas inlet 31 and the hydrogen gas outlet 32 are connected to the hydrogen supply pipe 13.

  In the regulator 5 configured as described above, when the second thrust acting upward is smaller than the first thrust acting downward, the downward force acts on the diaphragms 22a and 22b, and the valve body 27 is moved to the valve seat portion. It pushes in the direction away from 28 (namely, valve opening direction). Thereby, the flow hole 33 formed in the valve seat portion 28 is opened from the valve body 27, so that the hydrogen gas flowing through the hydrogen supply pipe 13 can flow through the regulator 5. On the other hand, when the second thrust becomes larger than the first thrust, an upward force acts on the diaphragm 22 and pushes the valve body 27 in a direction approaching the valve seat portion 28 (that is, a valve closing direction). . Thereby, the flow hole 33 formed in the valve seat portion 28 is closed by the valve body 27, so that the hydrogen gas flowing through the hydrogen supply pipe 13 cannot flow through the regulator 5.

  Further, the ejector 6 has a hydrogen supply flow path whose diameter is switched in multiple stages. Specifically, when a slide member having a plurality of nozzles having different diameters is slid, any one of the nozzles is supplied with hydrogen gas. Connected to supply channel. Thereby, the flow rate of the gas (in this case, hydrogen gas) supplied to the ejector 6 is controlled.

Further, an opening adjustment valve 16 and a regulator pressure sensor 35 are provided in the branch flow path 14 connected to the regulator 5 on the upstream side. On the other hand, an orifice 34 is provided in the branch flow path 15 connected to the regulator 5 on the downstream side.
The ECU 10 is connected to a battery voltage sensor 38 that detects a battery voltage (not shown), an atmospheric pressure sensor 37, an anode inlet pressure sensor 42, a cathode inlet pressure sensor 43, and a regulator pressure sensor 35. Based on this, the opening of the opening adjustment valve 16 is adjusted.

  The hydrogen off-gas recovery path 11 is connected to a hydrogen off-gas discharge path 12 via an electromagnetically driven purge valve 8. The purge valve 8 has an effect of draining water so that water does not collect on the anode electrode side of the fuel cell 1.

  Then, the inlet gas pressure of the fuel cell 1 is controlled to a target value as follows. That is, the outlet pressure of the regulator 5 is set in consideration of the pressure loss in the ejector 6 in order to set the anode inlet pressure (pressure detected by the anode inlet pressure sensor 42) to the target value. When the ejector 6 is a multiple system (a system in which the nozzle diameter is switched) as in the present embodiment, correction is performed in consideration of pressure loss in accordance with the switched diameter. Then, the signal pressure (pilot pressure PREG) of the regulator 5 is set according to the characteristics of the regulator 5, and is supplied to the signal pressure chamber 23 of the regulator 5 so that the actual pilot pressure PREG of the regulator 5 becomes the adjusted pressure. Adjust the amount of hydrogen gas (signal pressure imparting gas).

The operation of the fuel gas supply device of the fuel cell configured as described above will be described. FIG. 3 is a flowchart showing the operation of the fuel gas supply apparatus.
First, in step S12, the target anode pressure is set using the map 1 (see FIG. 4) based on the required output of the fuel cell 1. Here, the target anode pressure is the pressure of hydrogen gas supplied to the anode electrode of the fuel cell 1. FIG. 4 is a graph showing the relationship between the required output of the fuel cell and the target anode pressure. As shown in the figure, the required output of the fuel cell is substantially proportional to the target anode pressure, and even when the required output is low (including zero), it is required to ensure an anode pressure above a certain level. .

  Next, in step S14, a target signal pressure is set using map 2 (see FIG. 5) based on the target anode pressure. Here, the target signal pressure is a pressure applied to the signal pressure chamber 23 of the regulator 5. FIG. 5 is a graph showing the relationship between the target anode pressure and the target signal pressure. As shown in the figure, the target anode pressure and the target signal pressure are in a substantially proportional relationship. As shown in FIG. 4, even when the FC required output is low, a target anode pressure of a certain level or more is required. Therefore, the target signal pressure is also required to be a certain level or higher. .

In step S16, the valve opening of the opening adjustment valve 16 is set using the map 3 (see FIG. 6) based on the target signal pressure. FIG. 6 is a graph showing the relationship between the target signal pressure and the valve opening. As shown in the figure, the target signal pressure and the valve opening are substantially proportional, and when the target signal pressure is large, the opening of the opening adjustment valve 16 is also set large.
In step S18, it is determined whether or not the anode pressure detected by the anode inlet pressure sensor 42 matches the target pressure set in step S12. If this determination result is YES, the control of this flowchart is terminated. If the determination result is NO, the process proceeds to step S20, feedback control for adjusting the opening of the opening adjusting valve 16 again is performed, and the determination of step S18 is performed again.

  As described above, the signal pressure applied to the regulator 5 can be set by the opening adjustment valve 16 or the orifice 34 based on the high-pressure hydrogen gas supplied from the high-pressure hydrogen tank 30, so that it is applied to the cathode electrode. Regardless of the air pressure, the pressure of the hydrogen gas applied to the anode electrode can be adjusted.

This will be described with reference to FIGS. FIG. 7 is a graph showing the relationship between the fuel cell output and the regulator discharge in the fuel gas supply device of the fuel cell corresponding to the present invention. FIG. 8 is a graph showing the relationship between the fuel cell output and the regulator discharge in the fuel gas supply device of the fuel cell corresponding to the conventional example.
First, in the conventional example, as shown in FIG. 8, when the signal pressure of the regulator 5 is set in proportion to the air pressure supplied to the cathode electrode, the value of the cathode pressure is low when the fuel cell output is low (including zero). Therefore, the pressure of the regulator 5 is limited to a lower value. Therefore, when the fuel cell output is low, there is a state where the target anode pressure cannot be ensured (see FIG. 4).

  On the other hand, in the embodiment of the present invention, the anode pressure can be adjusted without being limited to the air pressure applied to the cathode electrode as shown in FIG. Therefore, even if the required output is low and the air pressure applied to the cathode electrode is low, the signal pressure can be set high to increase the pressure of the hydrogen gas applied to the anode electrode when judged necessary. it can. As described above, the anode pressure can be adjusted in accordance with various operating states of the fuel cell 1.

Further, since the anode pressure is adjusted regardless of the cathode pressure, it is not necessary to rapidly increase the regulation ratio and the supply flow rate of the air compressor 2. For this reason, the hydrogen gas pressure applied to the anode electrode can be adjusted without causing an increase in the size of the compressor 2 or the regulator 5, thereby making it possible to reduce costs and installation space, and is particularly suitable for mounting in a vehicle. It is.
Further, since the pressure upstream of the ejector 6 can be arbitrarily adjusted, the pressure discharged from the nozzle of the ejector 6 can be secured by using a small nozzle even in a low output region, so that the circulation flow rate by the ejector 6 can be increased, so that the stoichiometry can be increased. The ratio is improved, and the power generation stability of the fuel cell 1 is improved. This is because the amount of hydrogen used for power generation in the fuel cell 1 is equal to the amount of hydrogen discharged from the nozzle of the ejector 6 (fresh hydrogen amount). Here, the stoichiometric ratio is a ratio between the amount of hydrogen supplied to the fuel cell 1 and the amount of hydrogen used for power generation in the fuel cell 1. The amount of hydrogen supplied to the fuel cell 1 is the sum of the amount of hydrogen discharged from the nozzle of the ejector 6 (in other words, the amount of hydrogen used for power generation in the fuel cell) and the amount of circulating hydrogen.

  Further, by providing the orifice 34 in the branch flow path 15 for discharging the signal pressure applying gas (hydrogen gas) from the regulator 5, the flow rate of the hydrogen gas flowing through the branch flow path 15 can be limited. Therefore, hydrogen gas can be easily retained in the signal pressure chamber 23 of the regulator 5, and the signal pressure can be uniformly supplied to the regulator 5.

In addition, since the branch flow path 15 is connected to the hydrogen supply pipe 13, the hydrogen gas supplied to the signal pressure of the regulator 5 can be supplied to the anode electrode of the fuel cell 1 for power generation. , Can contribute to improved fuel efficiency.
Further, since the branch flow path 15 for discharging the signal pressure applying gas is connected to the hydrogen supply pipe 13 on the downstream side of the ejector 6, the ejector 6 by the signal pressure applying gas supplied to the regulator 5 for applying the signal pressure. Therefore, it is possible to improve the responsiveness of the decompression control of the hydrogen gas supplied to the anode electrode.

  Further, an opening degree adjusting valve 16 is formed in the branch flow path 14 for supplying the signal pressure applying gas, and an orifice 34 is formed in the branch flow path 15 for discharging the signal pressure applying gas. As a result, the opening of the opening adjustment valve 16 increases with the output of the fuel cell 1, so that the amount of hydrogen supplied from the branch flow path 15 to the anode electrode of the fuel cell 1 without passing through the ejector 6 is The lower the output of the fuel cell 1, the smaller the amount. With this characteristic, it is possible to reduce the performance degradation of the ejector 6 due to the hydrogen gas supplied from the branch flow path 15.

  Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is different from the above-described embodiment in that the branch flow path 41 for discharging the signal pressure applying gas is connected to the hydrogen supply pipe 13 on the upstream side of the ejector 6. In this way, since the hydrogen gas provided for applying the signal pressure of the regulator 5 can be supplied to the ejector 6, the circulation efficiency of the hydrogen gas by the ejector 6 can be improved.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the orifice 44 is formed in the branch flow path 14 for supplying the signal pressure applying gas, and the opening degree adjusting valve 45 is formed in the branch flow path 15 for discharging the signal pressure applying gas. This is different from the embodiment. In this way, since the opening degree is adjusted on the downstream side of the regulator 5, the pressure reduction response can be improved.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the orifice 44 is formed in the branch flow path 14 for supplying the signal pressure applying gas, and the opening adjustment valve 45 is formed in the branch flow path 41 for discharging the signal pressure applying gas. This is different from the embodiment. Even in this case, the hydrogen gas provided to apply the signal pressure of the regulator 5 can be supplied to the ejector 6, so that the circulation efficiency of the hydrogen gas by the ejector 6 can be improved.

  As described above, according to the present invention, since it is applied to a fuel cell vehicle using a fuel cell as a power source, various operating states required for the vehicle (for example, full load for supplying output to full load) The operating state of the fuel cell can be controlled so that it can cope with the output state and the idle stop state. Of course, the contents of the present invention are not limited to the embodiments, and can be applied to, for example, a fuel cell system other than a vehicle.

1 is a block diagram of a fuel gas supply device for a fuel cell according to a first embodiment of the present invention. It is sectional drawing of the regulator shown in FIG. It is a flowchart which shows operation | movement of the fuel gas supply apparatus of the fuel cell shown in FIG. It is a graph which shows the relationship between the request | requirement output of a fuel cell, and target anode pressure. It is a graph which shows the relationship between a target anode pressure and a target signal pressure. It is a graph which shows the relationship between target signal pressure and valve opening. It is a graph which shows the relationship between the fuel cell output and regulator discharge in the fuel gas supply apparatus of the fuel cell corresponded to this invention. It is a graph which shows the relationship between the fuel cell output and regulator discharge in the fuel gas supply apparatus of the fuel cell corresponded to a prior art example. It is a block diagram of the fuel gas supply apparatus of the fuel cell in the 2nd Embodiment of this invention. It is a block diagram of the fuel gas supply apparatus of the fuel cell in the 3rd Embodiment of this invention. It is a block diagram of the fuel gas supply apparatus of the fuel cell in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 5 ... Regulator 6 ... Ejector 13 ... Hydrogen supply pipe (fuel gas supply flow path)
14 ... Branch channel (Signal pressure applying gas supply channel)
15, 41 ... Branch channel (signal pressure application gas discharge channel)
16, 45... Opening adjustment valve (signal pressure adjusting means)
30 ... Hydrogen tank (fuel tank)
34, 44 ... Orifice (signal pressure adjusting means)

Claims (6)

A fuel tank for storing fuel gas in a pressurized state;
A fuel gas supply channel that connects the fuel tank and an anode electrode of the fuel cell, and supplies a fuel gas from the fuel tank to the anode electrode;
A fuel gas supply device for a fuel cell, which is provided in the fuel gas supply flow path and has a regulator for adjusting a supply pressure of the fuel gas to the anode electrode based on a signal pressure;
Branching from the fuel gas supply channel upstream of the regulator and connecting to the signal pressure chamber of the regulator, forming a signal pressure application gas supply channel for supplying fuel gas as signal pressure application gas,
A fuel gas supply device for a fuel cell, comprising signal pressure adjusting means for adjusting the signal pressure.   2. The fuel gas supply device for a fuel cell according to claim 1, wherein the signal pressure applying gas supply flow path is provided with an orifice constituting the signal pressure adjusting means.   The signal pressure applying gas discharge flow path for discharging the signal pressure applying gas from the regulator is provided with an orifice that constitutes the signal pressure adjusting means. A fuel gas supply device for a fuel cell.   The fuel gas supply device of a fuel cell according to claim 3, wherein the signal pressure applying gas discharge channel is connected to the fuel gas supply channel. A circulation channel for supplying the fuel gas discharged from the anode electrode to the anode electrode again is connected to the fuel gas supply channel via an ejector;
5. The fuel gas supply device of a fuel cell according to claim 4, wherein the signal pressure applying gas discharge channel is connected to the fuel gas supply channel on the upstream side of the ejector. 6. A circulation channel for supplying the fuel gas discharged from the anode electrode to the anode electrode again is connected to the fuel gas supply channel via an ejector;
5. The fuel gas supply device for a fuel cell according to claim 4, wherein the signal pressure applying gas discharge channel is connected to the fuel gas supply channel on the downstream side of the ejector. 6.

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