JPH11111315A - Fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell having high safety, while stably generating power by condensing moisture included in an exhaust oxidant or exhaust fuel gas in an exhaust duct for separation. SOLUTION: An exhaust duct 33 for discharging exhaust air generated from a fuel cell main body 3 out of a case 12 is provided. One end of the exhaust duct 33 is fixed to a partitioning wall 11 near an exhaust air outlet 60, and the other end thereof is adhered to communicate with an exhaust port 31 provided in a door 23 via a packing. Plural baffle plates 61 are arranged inside the duct, and the high temperature exhaust air flowing in the duct contacts with the baffle plates 61, and the moisture contained is condensed on an inner surface of the exhaust duct 33 and surfaces of baffle plates 61, and the dewatered exhaust gas is discharged out of the case 12. The separated water is collected in a drain pipe 62 of a lower part along a slope of the exhaust duct 33 and once stored inside of a drain tank 41, and a closing valve 63 is manually opened for draining out of the case 12, or the opening and closing valve 63 is opened for draining out of the case 12 on the basis of the signal from a control device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell.

[0002]

2. Description of the Related Art Conventionally, a fuel cell, a storage battery, a fuel supply source, a controller, and the like are provided, and surplus power after supplying power generated by the fuel cell to an external load is stored in the storage battery. 2. Description of the Related Art There is known a fuel cell device that supplements electric power from a storage battery and supplies the electric power to an external load when battery power is insufficient. As such a fuel cell device, a mobile fuel cell device having the above-described fuel cell, storage battery, fuel supply source, various controllers, and the like mounted inside a case is also known. Since such mobile fuel cells are excellent in portability, many expectations have been gathered as power supplies for civil engineering and construction work, home emergency power supplies, and the like.

[0003] There are two types of fuel cells: acidic fuel cells and alkaline fuel cells. The characteristics of a polymer electrolyte fuel cell, one of the acidic fuel cells, will be described below. As shown in FIG. 4, the polymer electrolyte fuel cell uses a polymer ion exchange membrane (for example, a fluororesin-based ion exchange membrane having a sulfonic acid group) for the electrolyte 01 and catalyst electrodes (for example, platinum) on both sides thereof. Etc.) and an electrode assembly 06 including current collectors 02 and 03 and current collectors 04 and 05.

[0004] Hydrogen in the humidified fuel supplied to the anode electrode is hydrogen-ionized on the catalyst electrode (anode electrode) 02, and the hydrogen ions pass through the electrolyte 01 with H ^+. _{As 2} O, it moves together with water to the cathode electrode side. The transferred hydrogen ions react with oxygen in the oxidant (for example, air) on the catalyst electrode (cathode electrode) 03 and the electrons flowing through the external circuit 07 to generate water. The generated water is transported from the cathodes 03 and 05 to the remaining oxidant and discharged out of the fuel cell. At this time, the flow of electrons flowing through the external circuit 07 can be used as DC electric energy.

In order to realize the above-mentioned hydrogen ion permeability in the polymer ion exchange membrane serving as the electrolyte 01, it is necessary to keep the polymer ion exchange membrane in a sufficiently water-retaining state at all times. Yes, for example, the fuel or oxidant is made to contain saturated water vapor corresponding to the vicinity of the operating temperature of the fuel cell (normal temperature to about 100 ° C.), that is, humidified to supply the fuel and the oxidant to the electrode assembly 06 to retain the water of the membrane. I try to keep my condition. In addition, the fuel cell generates heat during operation and needs to be cooled.

On the other hand, in the case of an alkaline fuel cell, hydroxyl ions move in the electrolyte and react with fuel gas (hydrogen gas) on the anode electrode to generate water. The generated water is transported from the anode to the remaining fuel gas and discharged out of the fuel cell.

A conventional fuel cell disclosed in Japanese Patent Application Laid-Open No. 6-310166 reforms a fuel cylinder 1 and an aqueous methanol solution jetted from the fuel cylinder 1 into a hydrogen component as shown in FIG. The fuel reformer 2 includes a fuel reformer 2, a fuel cell main body 3 for generating power using the hydrogen-based gas as fuel, and a case 5 for housing these components. The fuel cylinder 1 is detachably connected to the fuel reformer 2. . Reference numeral 4 denotes a control device.

On the other hand, a conventional fuel cell disclosed in Japanese Patent Application Laid-Open No. 9-171842, for example, as shown in FIG.
The inside of the case 5 is divided into spaces A, B, C, and D, and the hydrogen cylinder 1 housed in the space A on the left side of the case 5 and the case where power is generated using hydrogen supplied from the hydrogen cylinder 1 as fuel. 5, a storage battery 6 stored in a space C on the right side of the case 5, a storage battery 6 stored in a space C on the right side of the case 5, and a DC stored in a space D on the right side of the case 5.
The control unit 4 includes a power converter such as a / AC inverter and the like, and a closing lid 7 is provided at an upper part of the case 5.

[0009]

Since water is generated from the fuel cell main body as described above, when a high-temperature exhaust oxidant or exhaust fuel gas containing a large amount of water, such as the generated water, is discharged into the room, the indoor wall surface is disturbed. In such a case, dew condensation occurs, and a problem that mold and the like are generated occurs. Therefore, it is necessary to remove the water and exhaust the air to a room or the like. The conventional fuel cells disclosed in JP-A-6-310166 and JP-A-9-171842 do not take any measures to remove the water in the exhaust oxidizing agent or the exhaust fuel gas, and suggest a description. Nor. An object of the present invention is to provide a fuel cell in which water is removed from a waste oxidant or a waste fuel gas containing a large amount of water such as water generated from a fuel cell main body and exhausted.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on such a problem, and as a result, provided a water tank for supplying water to a fuel cell body in a case, and a waste oxidant or waste fuel gas. It is possible to solve the problem by condensing moisture in the exhaust duct and separating and then exhausting the water.Preferably, the separated wastewater is temporarily stored in a drainage tank via a drainage pipe and then drained out of the case. It has been found that the present invention has been accomplished.

That is, in order to solve the above-mentioned problems, the invention according to claim 1 includes a power supply unit having a fuel gas cylinder in a case, a fuel cell main body for receiving a supply of fuel gas and an oxidizing agent, and a fuel cell main body. A water tank for supplying water to the fuel cell, a control device, and the like are housed, and at least one of a waste oxidant or waste fuel gas containing water such as generated water from the fuel cell main body is discharged out of the case through a discharge duct. A fuel cell, wherein water contained in the exhaust oxidant or the exhaust fuel gas is condensed and separated in the exhaust duct.

In the present invention, a fuel gas cylinder, a fuel cell body which receives a supply of a fuel gas such as hydrogen gas and methane gas and an oxidant such as air to generate electric power, and produces a high-temperature exhaust oxidant and exhaust fuel gas, A power supply unit including a power converter such as a DC / AC inverter for converting DC power generated by the fuel cell into AC, a water tank for supplying water to the fuel cell body, and control for controlling these. The equipment etc. are compactly stored in the case.
It is preferable that the above-mentioned water tank is housed in, for example, the lower part of the rear part of the fuel cell of the present invention and supplied to the fuel cell main body by a pump or the like. It is preferable that the liquid level of the water tank is disposed below the fuel cell body. By doing so, the water in the water tank does not flow back to the fuel cell main body when the power is stopped, and the fuel cell main body can be prevented from being submerged.

The exhaust oxidant or the exhaust fuel gas is led to the exhaust duct, and the moisture in the exhaust oxidant or the exhaust fuel gas is condensed and separated in the middle of the exhaust duct. Even when the oxidizing agent or the exhaust fuel gas is discharged into the room, no dew condensation occurs on the indoor wall surface.

According to a second aspect of the present invention, in the fuel cell according to the first aspect, means is provided for collecting separated water in the water tank. If the separated water is collected in the water tank by disposing a pipe, a siphon, a pump or the like in the case, the separated water can be effectively used without being discarded.

According to a third aspect of the present invention, in the fuel cell according to the first or second aspect, the separated water is guided to a drain pipe, and is temporarily stored in a drain tank connected to the drain pipe. It is characterized by draining out of the case.
Once the separated water is stored in the drain tank through the drain pipe, and when the drain tank is full, the drain is opened by opening the on-off valve etc.
The drainage tank can be safely drained, and the water stored in the drainage tank can be circulated and used for water retention and cooling of the polymer ion exchange membrane of the fuel cell body, for example.

According to a fourth aspect of the present invention, in the fuel cell according to any one of the first to third aspects, a plurality of baffle plates are disposed inside the exhaust duct, and the exhaust oxidant or the exhaust The fuel gas is brought into contact with the baffle plate to condense and separate moisture in the exhaust duct.
The shape, number, size and the like of the baffle plate are not particularly limited.
The baffle plate is preferably arranged such that when the exhaust oxidant or the exhaust fuel gas is brought into contact with the baffle plate, the moisture is sufficiently condensed in the exhaust duct and can be separated.
It is preferable to provide a gradient in the exhaust duct so that the condensed water does not stay and collects and flows into the drain pipe.

According to a fifth aspect of the present invention, in the fuel cell according to any one of the first to fourth aspects, the exhaust oxidant or the exhaust fuel gas containing water in the exhaust duct is cooled. It is characterized by dew condensation in the exhaust duct and separation. By cooling the high-temperature exhaust oxidant or exhaust fuel gas in the exhaust duct, the contained moisture can be easily dewed. The method of cooling is not particularly limited.For example, even if a heat exchanger is provided in the exhaust duct and a high-temperature exhaust oxidant or exhaust fuel gas is brought into contact with the heat exchanger and cooled, the exhaust duct and The high temperature exhaust oxidizer or exhaust fuel gas may be indirectly cooled by cooling the baffle plate, or a method combining these may be used.

According to a sixth aspect of the present invention, in the fuel cell according to the fifth aspect, the exhaust oxidant or the exhaust fuel gas containing water in the exhaust duct is cooled with water and / or air and / or Peltier effect. It is characterized by utilizing and cooling. The method using water cooling is an easy and inexpensive method if a water source is available, and the method using the Peltier effect or cooling using a cooling fan (air cooling) uses electric power generated by the fuel cell of the present invention. It is also an easy and inexpensive method.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the appearance of one embodiment of the fuel cell of the present invention. FIG. 2 is an explanatory side view showing the inside of the fuel cell of the present invention shown in FIG. FIG.
Indicates an electric signal path (indicated by a dashed line in the figure), a hydrogen gas path (indicated by a dashed line in the figure), and an air path (solid line in the figure) between the components of the fuel cell of the present invention shown in FIG. It is an explanatory view showing a power route (displayed with a thick solid line in the figure) and a water route (displayed with a broken line in the figure).

1 to 3, a fuel cell 1 according to the present invention is shown.
Reference numeral 0 denotes a structure in which the inside of a case 12 of an integral structure is partitioned into a front part A and a rear part B by a partition wall 11. Two fuel gas cylinders 1 are stored in the front part a in an upright state. The rear part B is divided into an upper part 13, a middle part 14, and a lower part 15, and houses a power supply unit, a water tank, and the like. That is, the control device 16 including the secondary battery 44 and the DC / DC converter 46 and the auxiliary water tank 17 are housed in the upper stage 13.
The fuel cell main body 3 for generating electricity by supplying the fuel and air as an oxidant and causing an electrochemical reaction is accommodated in the middle stage 14, and the DC / AC inverter 1 is accommodated in the lower stage 15.
8 and a main water tank 19 connected to the auxiliary water tank 17 are housed. Reference numeral 20 denotes a movable wheel. 21
Is a handle used when moving, and 22 is an auxiliary arm rod that can be rotated separately. The fuel cell 10 of the present invention can be easily moved alone by using the movable wheel 20 and the handle 21.

The case 12 has an L-shaped door 23 and an operation panel 24 on the front surface, and has two side surfaces 25 and 26, a rear surface 27, and a bottom surface 2.
8, an upper surface 29, and a lid main body 30 that can be freely opened and closed to cover the front part A. Reference numeral 31 denotes an exhaust port provided at an upper portion of the door 23, and 32 denotes a side exhaust port for exhausting air or the like in the rear part B.

Here, the height of the case 12 is set slightly higher than the height of the fuel gas cylinder 1. The width of the front part a is set slightly larger than the sum of the two diameters of the fuel gas cylinder 1, the width of the exhaust duct 33, and the width of the operation panel 24, and the depth of the front part a is set slightly larger than the diameter of the fuel gas cylinder 1. ing.
The width and the depth of the rear part B are set slightly larger than the width and the depth of each member to be arranged. In this way, even if the case 12 is installed outdoors, water hardly penetrates, and the case 12 can be made compact.

As the fuel gas cylinder 1, for example, a commercially available one (10 L container, hydrogen amount 1.5 m ³ ) can be used. A hydrogen delivery valve 34 is provided at the upper end of each fuel gas cylinder 1, and the hydrogen delivery valve 34 and the fuel cell main body 3 are connected by a hydrogen supply pipe 35. Further, a pressure gauge 51 for displaying the pressure in the fuel gas cylinder 1, a regulator 47, and a solenoid valve 48 are inserted at predetermined positions of the hydrogen supply pipe 35.

The operation panel 24 has a digital display 3
6, a start / stop button 37, a display switching button 38, and the like are provided. By pressing the start / stop button 37, the operation of the fuel cell 10 of the present invention can be started or stopped. Display switching button 38
By pressing, the content displayed on the digital display unit 36 can be switched to, for example, an AC output, a fuel pressure, or another display. Reference numeral 39 denotes a water-resistant outlet. The operation panel 24 may be provided with alarm lamps for warning of an overload state, replacement of the fuel gas cylinder 1, and the like, and a display unit for displaying an error or the like.

An exhaust duct 33 for discharging exhaust air from the fuel cell body 3 to the outside of the case 12 is provided in the front part A. One end of the exhaust duct 33 is fixed to the exhaust air outlet 60 side of the fuel cell main body 3, and is fixedly attached to the partition 11 in the vicinity of the exhaust air outlet 60, and the other end is, for example, at the tip thereof. It is in close contact with an exhaust port 31 provided on the door 23 via a packing provided. Therefore, the exhaust air does not leak into the front part a. Although the position of the exhaust duct 33 in the front part A is not particularly limited, it is preferable to provide the exhaust duct 33 as close to the fuel cell body 3 as possible.

A plurality of baffle plates 61 are provided inside the exhaust duct 33, and the high-temperature exhaust air flowing as shown by the white arrow contacts the baffle plate 61 and contains the contained moisture (water). The generated water and part of the circulating water are condensed on the inner surface of the exhaust duct 33 and the surface of the baffle plate 61, and the exhaust air from which the water has been separated is discharged to the outside of the case 12. The separated water collects in a drain pipe 62 provided at a lower portion by a gradient provided in the exhaust duct 33 as indicated by an arrow, and temporarily enters a drain tank 41 provided in connection with the drain pipe 62. It is stored. The lower part of the drain pipe 62 is used as a part of the drain tank 41. When the lower portions of the drainage tank 41 and the drainage pipe 62 are full of water, the drainage is drained out of the case 12 by manually opening an on-off valve 63 provided at the end of the drainage tank 41, for example.
Alternatively, the water can be discharged to the outside of the case 12 by detecting this with a sensor (not shown) and sending a signal to the control device 16 and opening the on-off valve 63 by a signal from the control device 16. The generated water can be recycled without draining.

Reference numeral 40 denotes a main water tank 19 as shown in FIG.
Is a circulating pump for pumping water and supplying it to the polymer ion exchange membrane of the fuel cell main body 3 to keep it constantly in a water-retaining state, and to cool the water. The water is circulated and used. When the water in the main water tank 19 becomes low and reaches the limit, it is detected by a sensor or the like (not shown) and a signal is sent to the control device 16, and the signal from the control device 16 opens the auxiliary water tank solenoid valve 49. The water in the auxiliary water tank 17 connected to the main water tank 19 is supplied to the main water tank 19.

Reference numeral 42 denotes a fan which takes in the reaction air into the case 12 and sends it to the fuel cell main body 3. As shown in FIG. 3, hydrogen gas supplied from the fuel gas cylinder 1 to the anode electrode of the fuel cell body 3 via the regulator 47 and the solenoid valve 48 is supplied from the outside by the fan 42 to the reaction air inlet 4.
3 and the air which is taken into the case 12 through the case 12 and sent to the cathode electrode of the fuel cell main body 3 and the electrochemical reaction is performed in the fuel cell main body 3 to generate electric power. Case 1 as described above via mixer 50
2 to the outside. In the fuel cell 10, the fuel cell main body 3 is located near the reaction air intake 43 of the case 12, so that the intake from the outside can be smoothly performed.

The secondary battery 44 is, for example, a Ni-Cd secondary battery (12V-40Ah) using a nickel electrode for the positive electrode and a cadmium electrode for the negative electrode, and is installed in the control device 16 in this example. Normally, the secondary battery 44 is automatically charged by the surplus power of the fuel cell 10. However, the secondary battery 44 is connected to a charging input terminal 45 provided at a power extraction terminal unit (not shown) and an external AC power supply (not shown). AC100
V), the battery can be forcibly charged from the outside. The DC / DC converter 46 is a DC power voltage (24 to 50 V DC) from the fuel cell 10.
Is converted to a predetermined voltage (for example, DC 100 V), and the DC / AC inverter 18
V) to an alternating current (AC100V).

The controller 16 controls various controls, such as turning on / off an external output, processing a signal from a combustible gas sensor (not shown), transmitting an open / close signal to the solenoid valve 48 or the solenoid valve 49, and controlling the fuel cell body. 3 to transmit an ON / OFF signal to the DC / AC inverter 18 and the like. Alternatively, the primary pressure value measured by a pressure sensor (not shown) may be taken in, converted into a hydrogen gas remaining amount, transmitted to the digital display unit 36, and displayed. Further, data of the power output to the outside and data of the amount of charge of the secondary battery 44 are sent to the digital display unit 36,
This can also be displayed.

The hydrogen supply pipe 35 is connected to the fuel gas cylinder 1,
It is arranged to connect with the fuel cell body 3. Further, the regulator 47 and the solenoid valve 48 are inserted between the fuel gas cylinder 1 and the fuel cell main body 3 as described above, and the opening / closing of the solenoid valve 48 turns on / off the delivery of hydrogen gas from the fuel gas cylinder 1. Is made.

The control device 16 includes a fuel cell body 3, a secondary battery 44, a DC / DC converter 46, a DC / AC inverter 18, a solenoid valve 48, a fan 42, a circulation pump 40,
Not shown combustible gas sensor and main water tank water level meter, charging input terminal 45 and auxiliary water tank solenoid valve 4
9 for transmitting and receiving electrical signals to and from these devices. For example, when a flammable gas sensor (not shown) detects hydrogen gas having a concentration equal to or higher than a specified concentration, the signal is received, the electromagnetic valve 48 is closed to stop the supply of hydrogen gas, and the operation of the fuel cell body 3 is stopped. An alarm is issued by alarm lamps (not shown) or the operation of the entire fuel cell 10 is stopped.

The fuel cell main body 3 and the secondary battery 44 are electrically connected in parallel to each other, and when the power from the fuel cell 3 is not sufficient, the control device can supplement the power from the secondary battery 44 at startup. Power supply (AC100V-1K) to auxiliary equipment such as the water pump 16 and the water pump 40.
W).

FIG. 5 is an explanatory view showing an exhaust duct, a drain pipe, and the like of another fuel cell according to the present invention. In FIG. 5, a plurality of heat dissipating fins 65 are provided outside, and a cooling fan 64 is provided.
The high-temperature exhaust air flowing through the exhaust duct 33 in which the plurality of baffle plates 61 are disposed as shown by white arrows in contact with the baffle plate 61 is contained therein. The moisture is condensed on the inner surface of the exhaust duct 33 and the surface of the baffle plate 61, and the exhaust air from which the moisture is separated is discharged to the outside of the case 12 (not shown) as described above.
The separated water is discharged from the exhaust duct 3 as indicated by the arrow.
Due to the gradient provided in 3, they collect in a drain pipe 62 provided at the lower part, and are temporarily stored in a drain tank 41 provided in connection with the drain pipe 62. The lower part of the drain pipe 62 is used as a part of the drain tank 41. This drainage tank 4
When the lower part of the drain pipe 62 is filled with water, the drainage can be drained out of the case 12 by, for example, manually opening an on-off valve 63 provided at the end of the drain tank 41.

FIG. 6 is an explanatory view showing an exhaust duct, a drain pipe, and the like of another fuel cell according to the present invention. In the other fuel cell of the present invention shown in FIG. 6, the lower part of the exhaust duct 33 also serves as the drain pipe 62, and the heat exchanger 66 is provided in the exhaust duct 33 near the exhaust air outlet 60. . The heat exchanger 66 may be of a type that cools by passing water or gas inside, a type that cools using the Peltier effect, or a type that combines them. The exhaust air is supplied to the heat exchanger 66.
The water contained therein is cooled by contact with water, and condensed on the surface thereof, and flows through the exhaust duct 33 in which a plurality of baffle plates 61 are disposed as indicated by white arrows and flows into the baffle plates 61. Upon contact, the contained moisture condenses on the inner surface of the exhaust duct 33 and the surface of the baffle plate 61. The discharged air from which the water has been separated is discharged to the outside of the case 12 (not shown) as described above. The separated water flows downward in the exhaust duct 33 also serving as the drain pipe 62 as indicated by the arrow, and is temporarily stored in a drain tank 41 provided in connection with the drain pipe 62. The lower part of the drain pipe 62 is used as a part of the drain tank 41.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0037]

The fuel cell of the present invention can stably generate electric power because it can remove the water from the exhaust oxidant or the exhaust fuel gas containing a large amount of water, such as water produced from the fuel cell body, and exhaust it. It is safe, secure and compact. Even if the exhausted oxidant or exhausted fuel gas from which water is removed is discharged into a room, there is no problem that dew condensation does not occur on the indoor wall surface and mold and the like are generated.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a fuel cell of the present invention.

FIG. 2 is an explanatory side view showing the inside of the fuel cell of the present invention shown in FIG. 1;

FIG. 3 is an explanatory view showing an electric signal path, a hydrogen gas path, an air path, a power path, and a water path between components of the fuel cell of the present invention shown in FIG.

FIG. 4 is an explanatory diagram showing characteristics of a polymer electrolyte fuel cell.

FIG. 5 is an explanatory diagram showing an exhaust duct, a drain pipe, and the like of another fuel cell of the present invention.

FIG. 6 is an explanatory diagram showing an exhaust duct, a drain pipe, and the like of another fuel cell of the present invention.

FIG. 7 is an explanatory diagram of a conventional fuel cell.

FIG. 8 is an explanatory diagram of another conventional fuel cell.

[Explanation of symbols]

 B Front part Rear part 1 Fuel gas cylinder 3 Fuel cell body 10 Fuel cell 11 Partition wall 12 Case 13 Upper stage 14 Middle stage 15 Lower stage 16 Controller 17 Auxiliary water tank 18 DC / AC inverter 19 Main water tank 20 Movable wheel 23 Door 24 Operation panel 30 Lid body 31 Exhaust port 32 Side exhaust port 33 Exhaust duct 36 Digital display 37 Start / stop button 38 Display switch button 39 Outlet 40 Circulation pump 41 Drain tank 42 Fan 43 Reaction air intake 44 Secondary battery 46 DC / DC converter 60 Exhaust air outlet 61 Baffle plate 62 Drain pipe 64 Cooling fan 66 Heat exchanger

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Taketoshi Koki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. No. 5-5 in Sanyo Electric Co., Ltd.

Claims (6)

[Claims] 1. A power supply unit having a fuel gas cylinder in a case, a fuel cell main body for generating power by receiving supply of fuel gas and an oxidant, a water tank for supplying water to the fuel cell main body, and a control device And a fuel cell that discharges at least one of a waste oxidant or a fuel gas containing water, such as water generated from the fuel cell body, through an exhaust duct to the outside of the case. A fuel cell, wherein water contained in fuel gas is dewed and separated in the exhaust duct. 2. The fuel cell according to claim 1, further comprising means for collecting the separated water in the water tank. 3. The method according to claim 1, wherein the separated water is guided to a drain pipe, temporarily stored in a drain tank connected to the drain pipe, and then drained out of the case.
The fuel cell as described. 4. A plurality of baffle plates are provided inside the exhaust duct, and the exhaust oxidant or the exhaust fuel gas is brought into contact with the baffle plates to condense and separate moisture in the exhaust duct. The fuel cell according to any one of claims 1 to 3, wherein 5. The exhaust gas according to claim 1, wherein the exhaust oxidant or the exhaust fuel gas in the exhaust duct is cooled and dewed and separated in the exhaust duct. Fuel cell. 6. The fuel cell according to claim 5, wherein the exhaust oxidizer or the exhaust fuel gas in the exhaust duct is cooled using water cooling and / or air cooling and / or Peltier effect.