JP2005093357A - Fuel cell humidifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell humidifier capable of substantially reducing necessary power such as a blower by suppressing pressure loss of gas low and reducing cost without needing a mechanism such as a water level gauge for adjusting the water level, an expensive film, etc. <P>SOLUTION: In a humidifying container 4a, a cathode humidifier 4 humidifying the oxidizing agent gas by pressurizing cooling water warmed by cooling a fuel cell body 1 with a humidifying water supply pump 6 and spraying it from a spray nozzle 4b and introducing oxidizing agent gas provided to a cathode 1a of the fuel cell body 1 with a blower 7 is constituted. In the humidifying container 5a, an anode humidifier 5 humidifying the fuel gas by pressurizing cooling water warmed by cooling the fuel cell body 1 with the humidifying water supply pump 6 and spraying it from a spray nozzle 5b and introducing fuel gas provided to an anode 1b of the fuel cell body 1 is constituted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel cell humidifier.

  In general, in a polymer electrolyte fuel cell (PEFC), a fuel gas supplied to the anode of the fuel cell body and an oxidant gas such as air supplied to the cathode of the fuel cell body are humidified. Although it is necessary to do this, if they are not humidified, the polymer membrane used in the fuel cell body will be dried, while internal resistance and reaction resistance will increase, leading to performance degradation, This is because if the degree of drying is excessive, the polymer film may have heat and burn and have pores, which may prevent the battery from operating.

  Conventionally, a bubbler system or a membrane system is used as a fuel cell humidifier.

  The bubbler type humidifier is configured to humidify the fuel gas or the oxidant gas by supplying the fuel gas or the oxidant gas into the cooling water of the fuel cell and bubbling.

  Further, the membrane type humidifier humidifies the fuel gas or the oxidant gas by circulating the cooling water of the fuel cell and the fuel gas or the oxidant gas through a water-permeable membrane such as an ion exchange membrane. It is what I did.

For example, Patent Document 1 shows a general technical level of a polymer electrolyte fuel cell.
JP 2002-25589 A

However, in the bubbler-type humidifier as described above, it is necessary to increase the volume in order to increase the contact area of bubbles during bubbling and cooling water, which is a factor that hinders downsizing, as well as fuel gas and oxidant. In order for the gas to pass through the cooling water for humidification, a pressure loss of several hundred [mmH ₂ O] (≈several hundred × 9.8 [Pa]) occurs, so that the necessary power of a blower or the like for feeding the gas is required. If the gas pressure loss due to the humidifier occurs, it is necessary to increase the gas pressure by that amount. If you try to seal the water due to the difference in water level, the height of the cooling water tank that stores the cooling water Therefore, it has become difficult to realize this, and as a result, a mechanism for adjusting the water level such as a water level gauge is required, leading to a cost increase.

  In addition, since the membrane type humidifier has a low transmittance per unit area, it is necessary to increase the contact area, and a laminated structure using a flow path plate similar to a fuel cell and a long flow path must be used. In addition, the pressure loss of the gas is increased, and the structure is complicated in addition to the use of an expensive membrane, so that an increase in cost is inevitable.

  In view of such circumstances, the present invention can reduce the pressure loss of the gas, greatly reduce the required power of the blower, etc., eliminate the need for a mechanism for adjusting the water level such as a water level gauge, an expensive membrane, etc. It is an object of the present invention to provide a fuel cell humidifier capable of achieving the above.

  The present invention is configured to spray the cooling water whose temperature has been increased by cooling the fuel cell body into the humidification container and to humidify the gas by introducing the gas supplied to the fuel cell body. The present invention relates to a fuel cell humidifier.

  With this configuration, the gas is humidified by passing the gas through the humidification container in which the cooling water whose temperature has been increased by cooling the fuel cell main body is sprayed, so that almost no gas pressure loss occurs due to the humidifier. However, the required power of the blower that sends gas is reduced, and it is not necessary to lower the efficiency of the power generation system, leading to lower costs, while using cooling water whose temperature has risen by cooling the fuel cell body, There is no need for a particularly high heat source, and no temperature control is required. Further, since the cooling water sprayed in the humidifying container is in the form of mist-like water droplets and comes into contact with the gas, the contact area per unit volume is increased, and the humidifying container can be made compact.

  In the fuel cell humidifier, the bottom of the humidifying container and the bottom of the cooling water tank in which the cooling water is stored are connected by a cooling water return line that returns the cooling water supplied in the humidifying container to the cooling water tank. A water seal structure that prevents gas leakage due to the difference can be formed, and in this way, the water level can be increased without increasing the height of the cooling water tank and without providing a mechanism for adjusting the water level such as a water level gauge. It becomes possible to perform water sealing with the difference, and further cost reduction can be achieved.

  Further, in the fuel cell humidifier, a tank portion in which the cooling water in which the gas is humidified is stored can be integrally formed at the bottom of the humidifying container. In this way, the cooling water tank is separately provided. Compared with the above, the area occupied by the equipment in the power generation system is reduced, and it is possible to make it difficult to receive space restrictions as a whole.

  Furthermore, in the fuel cell humidifier, the cooling water can be supplied to the humidification container by a cooling water circulation pump that pumps the cooling water to the fuel cell body. This eliminates the need for a special pump for spraying the liquid into the humidifying container, and is more effective in reducing the required power.

  In the fuel cell humidifier, the gas may be oxidant gas supplied to the cathode of the fuel cell body.

  Further, the fuel cell humidifier is configured to spray the cooling water whose temperature has been increased by cooling the fuel cell body into the humidifying container and to introduce the gas supplied to the fuel cell body so as to humidify the gas. In the apparatus or the fuel cell humidifier, the bottom of the humidifying container and the bottom of the cooling water tank in which the cooling water is stored are connected by a cooling water return line that returns the cooling water supplied in the humidifying container to the cooling water tank. In the case of forming a water-sealed structure that prevents gas leakage due to a difference in water level, the gas can be used as fuel gas supplied to the anode of the fuel cell body.

  On the other hand, according to the present invention, a filler layer filled with a filler is formed in a humidified container, and cooling water whose temperature has been increased by cooling the fuel cell body is supplied to the filler layer, and to the fuel cell body. The present invention is directed to a fuel cell humidifier that is configured to humidify a gas that is supplied by passing the gas.

  With this configuration, the gas is humidified by passing the gas through the humidification container in which the filler layer is formed and the cooling water whose temperature is increased by cooling the fuel cell body is supplied. Gas pressure loss due to the generation of air is reduced, and the required power of the blower that feeds in gas is reduced, reducing the efficiency of the power generation system, leading to lower costs, while cooling the fuel cell body to raise the temperature Since water is used, a particularly high heat source is not required, and temperature control is also unnecessary. Further, since the cooling water supplied into the humidifying container is in contact with the gas while being transmitted along the surface of the filler, the contact area per unit volume is increased, and the humidifying container can be made compact.

  In the fuel cell humidifier in which the filler layer is formed, the cooling water that returns the cooling water supplied to the humidifying container to the cooling water tank is provided between the bottom of the humidifying container and the bottom of the cooling water tank in which the cooling water is stored. It can be connected by a return line to form a water-sealed structure that prevents gas leakage due to water level difference. In this way, the water level of the water level gauge and the like can be adjusted without increasing the height of the cooling water tank. Without providing a mechanism, it becomes possible to perform water sealing with a difference in water level, and further cost reduction can be achieved.

  Further, in the fuel cell humidifier in which the filler layer is formed, a tank portion in which cooling water humidified with gas is stored can be integrally formed at the bottom of the humidifying container. Compared with a separate water tank, the area occupied by the equipment in the power generation system is reduced, and the overall space can be made less susceptible to space constraints.

  Furthermore, in the fuel cell humidifier in which the filler layer is formed, the cooling water can be supplied to the humidification container by a cooling water circulation pump that pumps the cooling water to the fuel cell main body. If it does in this way, the special pump for supplying cooling water in a humidification container will become unnecessary, and it will become more effective in reducing required power.

  In the fuel cell humidifier in which the filler layer is formed, the gas can be oxidant gas supplied to the cathode of the fuel cell body.

  Moreover, in the fuel cell humidifier in which the filler layer is formed, the filler can be a ceramic small-diameter short tubular member.

  Furthermore, in the fuel cell humidifier in which the filler layer is formed, the filler can be a metal small-diameter short tubular member.

  According to the fuel cell humidifier of the present invention, the following excellent effects can be obtained.

  If the fuel cell body is cooled and sprayed with cooling water whose temperature has risen and the gas supplied to the fuel cell body is introduced to humidify the gas, the gas generated by the humidifier Almost no pressure loss is generated, and the power required for blowers that send in gas can be greatly reduced, the efficiency of the power generation system can be prevented from lowering, and costs can be reduced. By using the cooling water, a special high heat source is not required, temperature control may be unnecessary, and the cooling water sprayed in the humidifying container is in the form of mist-like water droplets that come into contact with the gas. The contact area per contact can be increased, and the humidification container can be made compact.

  In the fuel cell humidifier configured to spray the cooling water, the cooling water for returning the cooling water supplied in the humidification container to the cooling water tank is provided between the bottom of the humidification container and the cooling water tank in which the cooling water is stored. If the water seal structure that prevents gas leakage due to the water level difference is formed by connecting with the return line, the water level can be increased without increasing the height of the cooling water tank and without providing a mechanism for adjusting the water level such as a water level gauge. Water sealing can be performed by the difference, and further cost reduction can be achieved.

  Further, in the fuel cell humidifier configured to spray the cooling water, if the tank portion in which the cooling water in which the gas is humidified is integrally formed at the bottom of the humidifying container, the cooling water tank is separately provided. Compared to the above, it is possible to reduce the area occupied by the equipment in the power generation system and to make it difficult to receive space restrictions as a whole.

  Furthermore, in the fuel cell humidifier configured to spray the cooling water, if the cooling water is supplied to the humidifying container by a cooling water circulation pump that pumps the cooling water to the fuel cell main body, the cooling water is supplied. A special pump for spraying the liquid into the humidifying container can be eliminated, and the required power can be further reduced.

  On the other hand, a filler layer filled with a filler is formed in the humidifying container, and cooling water whose temperature has been increased by cooling the fuel cell body is supplied to the filler layer, and gas supplied to the fuel cell body If the gas is configured to be humidified by passing the gas, almost no gas pressure loss is generated by the humidifier, the required power such as a blower for feeding the gas can be reduced, and a decrease in efficiency of the power generation system can be prevented. While the cost can be reduced, the use of cooling water whose temperature has been increased by cooling the fuel cell main body does not require a particularly high heat source, can eliminate the need for temperature control, and is supplied to the humidifying container. Since the cooling water is in contact with the gas while traveling along the surface of the filler, the contact area per unit volume can be increased, and the humidification container can be made compact.

  In the fuel cell humidifying device in which the filler layer is formed, a cooling water return for returning the cooling water supplied in the humidifying container to the cooling water tank is provided between the bottom of the humidifying container and the bottom of the cooling water tank in which the cooling water is stored. If the water seal structure that prevents gas leakage due to the water level difference is formed by connecting with the line, the water level difference can be achieved without increasing the height of the cooling water tank and without providing a mechanism for adjusting the water level such as a water level gauge. Can be sealed with water, which can further reduce the cost.

  In addition, in the fuel cell humidifier with the filler layer formed, if a tank part for storing the cooling water in which the gas is humidified is integrally formed at the bottom of the humidifying container, the cooling water tank can be separately provided. In comparison, the area occupied by equipment in the power generation system can be reduced, and the overall space can be made less susceptible to space constraints.

  Furthermore, in the fuel cell humidifier in which the filler layer is formed, if the cooling water is supplied to the humidification vessel by a cooling water circulation pump that pumps the cooling water to the fuel cell main body, the cooling water is supplied. A special pump for spraying into the humidification container can be dispensed with, and the required power can be further reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of an embodiment of the present invention. 1 is a fuel cell main body having a cathode 1a and an anode 1b, 2 is a cooling water tank in which cooling water for the fuel cell main body 1 is stored, and 3 is cooling water. A cooling water circulation pump that pumps cooling water stored in the tank 2, 4 is a cathode humidifier that humidifies an oxidant gas such as air, 5 is an anode humidifier that humidifies fuel gas, and the cathode humidifier 4 includes: Cooling water whose temperature has been increased by cooling the fuel cell main body 1 in the humidifying container 4a is pressurized by the humidifying water supply pump 6 and sprayed from the spray nozzle 4b, and supplied to the cathode 1a of the fuel cell main body 1 by the blower 7. The oxidant gas is humidified by introducing the oxidant gas, and the anode humidifier 5 is a cooling water whose temperature is increased by cooling the fuel cell body 1 in the humidification container 5a. With sprayed from pressurized spray nozzle 5b by the humidification water supply pump 6, by introducing the fuel gas supplied to the fuel cell body 1 of the anode 1b, it is configured to humidify the fuel gas.

  In the case of this illustrated example, the humidification containers 4a and 5a bottoms of the cathode humidifier 4 and the anode humidifier 5 and the bottom of the cooling water tank 2 in which cooling water is stored are supplied into the humidification containers 4a and 5a. A cooling water return line 8 that returns the cooling water to the cooling water tank 2 is connected to form a water seal structure that prevents gas leakage due to a difference in water level.

  In the middle of the cooling water return line 8, the oxidant gas is separated from the cooling water after humidifying the oxidant gas in the cathode humidifier 4, and the oxidant gas is supplied to the humidification container via the oxidant gas return line 9. The gas-liquid separator 10 which returns the cooling water which returned to 4a and isolate | separated oxidant gas to the cooling water tank 2, and fuel gas is isolate | separated from the cooling water after humidifying the fuel gas in the anode humidifier 5, and this fuel gas is separated. A gas-liquid separator 12 is provided for returning to the humidification container 5a via the fuel gas return line 11 and returning the cooling water from which the fuel gas has been separated to the cooling water tank 2.

  Further, a part of the cooling water whose temperature has risen by cooling the fuel cell main body 1 is returned to the cooling water tank 2 via the bypass line 13 that bypasses the humidifying water supply pump 6 and leads to the cooling water return line 8. It is.

  Next, the operation of the illustrated example will be described.

  When configured as described above, the oxidant gas and the fuel gas pass through the humidifying containers 4a and 5a of the cathode humidifier 4 and the anode humidifier 5, respectively, to which the cooling water whose temperature has been increased by cooling the fuel cell body 1 is sprayed. As a result, the oxidant gas and the fuel gas are humidified, so that almost no gas pressure loss is generated by the humidifier, the required power of the blower 7 or the like for sending the oxidant gas is reduced, and the efficiency of the power generation system is lowered. This eliminates the need for cost reduction, while the use of cooling water whose temperature is increased by cooling the fuel cell main body 1 does not require a particularly high heat source, and does not require temperature control. Further, since the cooling water sprayed in the humidifying containers 4a and 5a is in the form of mist-like water droplets and comes into contact with the gas, the contact area per unit volume is increased, and the humidifying containers 4a and 5a can be made compact. .

  In this example of illustration, the cooling water which returns the cooling water supplied in the humidification containers 4a and 5a to the cooling water tank 2 with the bottom parts of the humidification containers 4a and 5a and the cooling water tank 2 bottom where the cooling water is stored Since a water seal structure is formed which is connected by a return line 8 and prevents gas leakage due to a difference in water level, a mechanism for adjusting the water level such as a water level gauge is provided without increasing the height of the cooling water tank 2. Therefore, it becomes possible to perform water sealing with a difference in water level, and further cost reduction can be achieved.

  In this way, the pressure loss of the oxidant gas and fuel gas can be kept low, the required power of the blower 7 and the like can be greatly reduced, and a mechanism for adjusting the water level such as a water level gauge, an expensive membrane, etc. are unnecessary, and cost reduction is achieved. obtain.

  FIG. 2 shows another example of the embodiment of the present invention. In the drawing, the same reference numerals as those in FIG. 1 denote the same parts, and at the bottom of the humidifying container 4a of the cathode humidifier 4, The tank portion 4c in which the cooling water humidified with the oxidant gas is stored is integrally formed, and the cooling water is supplied to the humidification vessel 4a by the cooling water circulation pump 3 that pumps the cooling water to the fuel cell main body 1. It is what I did.

  In the example of FIG. 2, instead of the anode humidifier 5 shown in FIG. 1, the cooling water is filled with a filler and the temperature of the fuel cell body 1 is increased by cooling the fuel cell body 1 and the anode 1 b of the fuel cell body 1. A quencher 5 ′ into which the supplied fuel gas is introduced is provided so that the fuel gas is cooled and moisture is reduced in the initial operation of the fuel cell body 1, while the fuel gas is humidified during rated operation. . The cooling water supplied into the quencher 5 ′ is returned to the tank portion 4c integrated with the humidifying container 4a of the cathode humidifier 4 through the cooling water return line 8 ′, and the fuel cell body 1 is cooled. Then, a part of the cooling water whose temperature has risen is returned to the tank portion 4c via the bypass line 13 ′ and the cooling water return line 8 ′.

  As shown in FIG. 2, when the tank portion 4c in which the cooling water humidified with the oxidant gas is integrally formed at the bottom of the humidifying container 4a of the cathode humidifier 4, the cooling as shown in FIG. Compared with the case where the water tank 2 is separately provided, the area occupied by the equipment in the power generation system is reduced, and it is possible to make it difficult to receive space restrictions as a whole.

  Further, as shown in FIG. 2, when the cooling water is supplied to the humidification container 4a by the cooling water circulation pump 3 that pumps the cooling water to the fuel cell main body 1, the cooling water is stored in the humidification container 4a. This eliminates the need for a special pump for spraying, and is more effective in reducing the required power.

Here, the power generation system side demands that air 310 [l (normal) / min] as the oxidant gas is saturated at 55 [° C.] and the gas pressure loss at that time is 100 [mmH ₂ O] or less. In some cases, when the humidification performance test was performed with the cathode humidifier 4 as shown in FIG. 2, air 350 [l (standard) / min] (326 [l (normal) / min]) was supplied at a supply pressure of 0.5. [Kgf / cm ² ] (≈0.5 × 9.8 [N / cm ² ]) can be humidified to 59 [° C.] saturation, and the gas pressure loss at that time is 10 to 30 [mmH ₂ O It has been confirmed that sufficient humidification performance can be obtained with only the cooling water circulation pump 3 that pumps the cooling water to the fuel cell main body 1, and the requirements on the power generation system side are satisfied. Show.

  Thus, even in the example shown in FIG. 2, the pressure loss of the gas can be kept low, the required power of the blower 7 and the like can be greatly reduced, and a mechanism for adjusting the water level such as a water level gauge or an expensive membrane is not required. Cost can be reduced.

  FIG. 3 shows still another example of the embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same parts, and the humidifier 4a of the cathode humidifier 4 Instead of providing the spray nozzle 4b shown in FIG. 2, a filler layer 15 filled with the filler 14 is formed, and cooling water whose temperature has been increased by cooling the fuel cell body 1 is supplied to the filler layer 15. At the same time, the oxidant gas supplied to the cathode 1a of the fuel cell main body 1 is allowed to pass through to humidify the oxidant gas.

As the filler 14, for example, a ceramic or metallic small-diameter short tubular member as shown in FIG. 4 can be used. When a ceramic small-diameter short tubular member is used as the filler 14, the size is 1/4 [吋], the space ratio is approximately 62 [%], the surface area is approximately 712 [m ² / m ³ ], and the number of pieces is A material having a mass of about 3150,000 [pieces / m ³ ] and a mass of about 913 [kg / m ³ ] can be employed.

  When configured as in the example shown in FIG. 3, the oxidant gas passes through the humidifying container 4a in which the filler layer 15 is formed and the cooling water whose temperature is increased by cooling the fuel cell body 1 is supplied. Since the oxidant gas is humidified, there is almost no gas pressure loss due to the humidifier, and the power required for the blower 7 and the like for sending the oxidant gas is reduced, reducing the efficiency of the power generation system and reducing the cost. On the other hand, since the cooling water whose temperature is increased by cooling the fuel cell main body 1 is used, a particularly high heat source is not required, and temperature control is also unnecessary. Further, since the cooling water supplied into the humidifying container 4a is in contact with the gas while being transmitted through the surface of the filler 14, the contact area per unit volume is increased, and the humidifying container 4a can be made compact.

  In the example shown in FIG. 3, similarly to the example shown in FIG. 2, a tank part 4 c in which cooling water humidified with an oxidant gas is stored is integrally formed at the bottom of the humidifying container 4 a of the cathode humidifier 4. Therefore, compared with the case where the cooling water tank 2 as shown in FIG. 1 is placed separately, the area occupied by the equipment in the power generation system is reduced, and it is possible to make it difficult to receive space restrictions as a whole. .

  Further, in the example shown in FIG. 3, similarly to the example shown in FIG. 2, the cooling water is supplied to the humidifying container 4 a by the cooling water circulation pump 3 that pumps the cooling water to the fuel cell main body 1. Therefore, a special pump for spraying the cooling water into the humidifying container 4a is not necessary, which is more effective in reducing the required power.

Here, as described above, the requirement on the power generation system side is that the air 310 [l (normal) / min] as the oxidant gas is saturated at 55 [° C.], and the gas pressure loss at that time is 100 [mmH ₂ O. In the following, when the humidification performance test was performed with the cathode humidifier 4 as shown in FIG. 3, air 350 [l (standard) / min] (326 [l (normal) / min]) was supplied. It has been confirmed that water can be humidified to 66 [° C.] saturation at a water volume of 5 [l / min], and the gas pressure loss at that time can be suppressed to about 24 [mmH ₂ O]. It shows that sufficient humidification performance can be obtained only by the cooling water circulation pump 3 that pumps water to the fuel cell main body 1, and the requirements on the power generation system side are satisfied.

  Thus, even in the case of the example shown in FIG. 3, the pressure loss of the gas can be kept low, the required power such as a blower can be greatly reduced, and a mechanism for adjusting the water level such as a water level gauge or an expensive membrane is unnecessary. Cost can be reduced.

  The fuel cell humidifier of the present invention is not limited to the illustrated example described above. In the example shown in FIG. 2 or 3, the tank portion 4 c is integrated with the bottom of the humidifying container 4 a of the cathode humidifier 4. 1 may be provided separately as the cooling water tank 2 as in the example shown in FIG. 1 to form a water seal structure that prevents gas leakage due to a difference in water level. Of course, various changes can be made without departing from the scope of the invention.

It is a schematic block diagram of an example of embodiment which implements this invention. It is a schematic block diagram of the other example of embodiment which implements this invention. It is a schematic block diagram of the further another example of embodiment which implements this invention. It is a perspective view which shows an example of the shape of the filler with which it fills in the humidification apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell main body 1a Cathode 1b Anode 2 Cooling water tank 3 Cooling water circulation pump 4 Cathode humidifier 4a Humidification container 4b Spray nozzle 4c Tank part 5 Anode humidifier 5a Humidification container 5b Spray nozzle 6 Humidification water supply pump 7 Blower 8 Cooling water return Line 14 Filler 15 Filler layer

Claims (13)

  A fuel characterized in that the fuel cell body is cooled and sprayed with cooling water whose temperature has risen, and the gas supplied to the fuel cell body is introduced to humidify the gas. Battery humidifier.   The bottom of the humidification container and the bottom of the cooling water tank in which the cooling water is stored are connected by a cooling water return line that returns the cooling water supplied in the humidification container to the cooling water tank, thereby preventing gas leakage due to the water level difference. The fuel cell humidifier according to claim 1, wherein a water seal structure is formed.   The fuel cell humidifier according to claim 1, wherein a tank portion in which cooling water in which gas has been humidified is stored is integrally formed at a bottom portion of the humidifying container.   The fuel cell humidifier according to any one of claims 1 to 3, wherein the coolant is supplied to the humidification container by a coolant circulation pump that pumps the coolant to the fuel cell main body.   The fuel cell humidifier according to claim 1, wherein the gas is an oxidant gas supplied to the cathode of the fuel cell main body.   The fuel cell humidifier according to claim 1 or 2, wherein the gas is a fuel gas supplied to the anode of the fuel cell main body.   A filler layer filled with a filler is formed in a humidified container, and cooling water whose temperature has been increased by cooling the fuel cell body is supplied to the filler layer, and gas supplied to the fuel cell body is passed through the filler layer. A fuel cell humidifier configured to humidify the gas.   The bottom of the humidification container and the bottom of the cooling water tank in which the cooling water is stored are connected by a cooling water return line that returns the cooling water supplied in the humidification container to the cooling water tank, thereby preventing gas leakage due to the water level difference. 8. The fuel cell humidifier according to claim 7, wherein a water seal structure is formed.   The fuel cell humidifier according to claim 7, wherein a tank part in which cooling water in which gas has been humidified is stored is integrally formed at a bottom part of the humidifying container.   The fuel cell humidifier according to any one of claims 7 to 9, wherein the cooling water is supplied to the humidification container by a cooling water circulation pump that pumps the cooling water to the fuel cell main body.   The fuel cell humidifier according to any one of claims 7 to 10, wherein the gas is an oxidant gas supplied to the cathode of the fuel cell main body.   The fuel cell humidifier according to any one of claims 7 to 11, wherein the filler is a small-diameter short tubular member made of ceramics.   The fuel cell humidifier according to any one of claims 7 to 11, wherein the filler is a metal small-diameter short tubular member.

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