JP4158468B2 - Fuel cell power generation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel cell power generation system that exhausts heat generated in a fuel cell by exchanging heat with circulating water.
[0002]
[Prior art]
Conventionally, there is a fuel cell power generation system that generates power using a hydrocarbon-based raw fuel. In this system, a fuel cell generates electricity by electrochemically reacting a gas containing oxygen and a reformed gas. Since this electrochemical reaction is accompanied by heat generation, the fuel cell becomes hot as electricity is generated. However, the fuel cell can generate electricity more efficiently at a constant temperature. Therefore, unless the generated heat is discharged from the fuel cell, the power generation efficiency may be reduced. For example, in a fuel cell, a solid polymer type fuel cell, which has a high degree of attention due to good handleability, has a temperature at which about 70 to 80 ° C. can be efficiently generated.
[0003]
One method for cooling the fuel cell to keep it at a constant temperature is to use a fluid heat medium such as pure water. This is because a flow path capable of exchanging heat with the fuel cell is formed inside the fuel cell, and pure water is passed through the flow path to exchange heat between the fuel cell and pure water, thereby cooling the fuel cell. I have to. Also, with this method, it is rare to discard pure water once it is used, and it is possible to form a pure water flow path in an annular shape and use it by repeatedly circulating in the annular flow path. Many.
[0004]
However, even when a low-conductivity heat medium such as pure water is used, if it is circulated many times and repeatedly used, the components of the fuel cell, the flow path, and other components will become impurities. Elution into pure water may increase the conductivity of pure water. If the conductivity of pure water increases, it may cause problems such as damage to the fuel cell and a decrease in power generation capacity. Therefore, periodically or continuously purify the heat medium to keep the heat medium conductivity low. It is necessary to do.
[0005]
A fuel cell power generation system as shown in FIG. 11 is provided with such a heat medium purification measure (see, for example, Patent Document 1). As shown in FIG. 11, this circuit forms a circulation channel 31 in which purified water flows in an annular shape, and a water tank 91 for replenishing new liquid is formed in a part of the circulation channel 31. . This purified water (hereinafter referred to as circulating water) flows repeatedly in the circulation channel 31 to cool the fuel cell 1. As the circulating water repeatedly flows in the circulation channel 31, impurities gradually begin to mix and the conductivity increases. At that time, part of the circulating water is discharged from the circulation channel 31. Then, a low-conductivity new liquid having an amount of water corresponding to the amount of the circulated water is supplied to a water tank 91 that forms part of the circulation channel 31 from a water storage tank 92 that stores city water. Thereby, the electrical conductivity of the circulating water having a high electrical conductivity is lowered again by mixing it with a new liquid having a low electrical conductivity. By taking such purification measures, it becomes possible to maintain low conductivity without increasing the conductivity of the circulating water, and the fuel cell 1 can stably generate power.
[0006]
[Patent Document 1]
JP 2002-134126 A
[0007]
[Problems to be solved by the invention]
However, in this case, since the water tank 91 forms a part of the circulation channel 31, when a new liquid is replenished to the water tank 91, purified water having a temperature lower than that of the circulating water is mixed with the hot circulating water. As a result, the water temperature in the water tank 91 is drastically lowered. Since the fuel cell 1 can generate electric power more efficiently at a constant temperature, when such a water temperature fluctuation occurs, the electric power generation may become extremely unstable.
[0008]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel cell power generation system capable of generating power more stably.
[0009]
[Means for Solving the Problems]
  In the fuel cell power generation system according to the first aspect of the present invention, heat generated in the fuel cell is discharged by exchanging heat with circulating water flowing in the circulation channel, and part of the circulating water is drained from the circulation channel. However, in the fuel cell power generation system that introduces a new amount of water corresponding to the amount of the drained circulating water into the circulation channel,A water tank that is disposed outside the circulation flow path and contains a new liquid; and an introduction flow path that communicates the water tank and the circulation flow path. The water tank has a part of its wall surface opened. In addition to communicating with the atmosphere through the open portion, a new amount of water corresponding to the amount of circulating water discharged from the circulation channel is introduced into the circulation channel through the introduction channel.
[0010]
  A fuel cell power generation system according to a second aspect of the present invention is the fuel cell power generation system according to the first aspect, wherein the water component contained in the reformed gas introduced into the fuel cell or the exhaust gas discharged from the fuel cell. Air and water, and the water component separatedWaterAn air / water separator supplied to the tank and a purification device for purifying the new liquid introduced into the circulation flow path are also provided.
[0011]
  The fuel cell power generation system according to claim 3 is the fuel cell power generation system according to claim 1 or 2,The said water tank has the said open part on the upper surface of the wall surface, It is characterized by the above-mentioned.
[0012]
  A fuel cell power generation system according to a fourth aspect of the present invention is the fuel cell power generation system according to any one of the first to third aspects.WaterA water level detecting means for detecting the water level of the new liquid stored in the tank is also provided.
[0013]
  A fuel cell power generation system according to a fifth aspect of the present invention is the fuel cell power generation system according to any one of the first to fourth aspects, wherein a new liquid is supplied according to the amount of circulating water drained from the circulation passage. UpWaterIt is characterized by replenishing the tank.
[0014]
  A fuel cell power generation system according to a sixth aspect of the present invention is the fuel cell power generation system according to any one of the first to fifth aspects, wherein the fresh liquid in the introduction flow path or the topWaterA heating means for heating the new liquid to be supplied to the tank is also provided.
[0015]
  A fuel cell power generation system according to a seventh aspect of the present invention is the fuel cell power generation system according to the sixth aspect, wherein the heating means exchanges heat with air exhausted from the cathode of the fuel cell or exhaust gas exhausted from the anode. New liquid in the introduction flow path, orWaterIt is characterized by heating a new liquid to be supplied to the tank.
[0016]
  A fuel cell power generation system according to an eighth aspect of the present invention is the fuel cell power generation system according to the sixth or seventh aspect, wherein the heating means exchanges heat with circulating water drained from the drainage channel, and New liquid in the introduction flow path or aboveWaterIt is characterized by heating a new liquid to be supplied to the tank.
[0017]
  A fuel cell power generation system according to a ninth aspect of the present invention is the fuel cell power generation system according to any one of the sixth to eighth aspects, wherein the heating means exchanges heat with the circulating water in the circulation flow path. , New solution in the introduction channel, or aboveWaterIt is characterized by heating a new liquid to be supplied to the tank.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
A fuel cell power generation system according to a first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a fuel cell, 11 is a cathode (air electrode) of the fuel cell 1, 12 is an anode (fuel electrode) of the fuel cell 1, 31 is a circulation channel, and 13 is formed inside the fuel cell 1 and circulates. A cooling flow path that forms part of the flow path 31, 21 is an open water tank, 32 is an introduction flow path that connects the water tank 21 and the circulation flow path 31, and 33 is circulating water that is discharged from the circulation flow path 31. A drainage flow path that passes therethrough, 61 is a reformer, and 62 is a heat recovery apparatus that recovers heat from the circulating water in the circulation flow path 31.
[0020]
The open water tank 21 is a hollow tank, and its upper surface is open to the atmosphere. That is, the inside and outside of the tank are in communication with each other through an open portion on the upper surface of the tank. Therefore, when a new liquid is stored in the water tank 21, the atmospheric pressure applied to the new liquid becomes atmospheric pressure. The open portion is not necessarily provided on the upper surface of the tank, but may be provided on a part of the peripheral wall of the tank. However, the open portion is located on the upper side of the water tank 21, and the water storage of the water tank is performed. The amount is preferred because it increases. If the open part is on the lower side of the water tank 21, the new liquid flows out from the open part, and the amount of water that can be stored is reduced.
[0021]
On the other hand, a hole connected to the introduction flow path 32 is provided on the lower surface of the water tank 21. That is, the new liquid stored in the water tank 21 is caused to flow into the introduction flow path 32 through this hole. The position of the hole connecting the introduction flow path 32 is not necessarily provided on the lower surface of the tank and may be provided on the peripheral wall of the tank, but is on the lower surface side than the position of the open portion. It is near the lower surface of the water tank 21. As described above, since the new liquid is accommodated in the open water tank 21, when the new liquid is drained from the water tank 21, a hole provided in the lower portion of the water tank 21 is used without using a pump or the like. Naturally flows out of.
[0022]
Further, as shown in FIG. 1, the open water tank 21 formed in this way is provided outside the circulation channel 31, that is, circulating water flowing through the circulation channel 31 flows into the water tank 21. The circulation channel 31 and the water tank 21 are communicated with each other via an introduction channel 32. Thereby, when new liquid is replenished to the water tank 21, it can prevent introducing into the circulation flow path 31 at once.
[0023]
Hereinafter, the operation of the fuel cell power generation system of this embodiment will be described. First, when a hydrocarbon-based raw fuel is supplied to the reformer 61, the raw fuel is reformed into a hydrogen-rich reformed gas by a steam reforming reaction and supplied to the anode 12 of the fuel cell 1. The cathode 11 is supplied with oxygen-containing gas or air necessary for the electrochemical reaction by, for example, a blower. In the fuel cell 1, the reformed gas and oxygen are electrochemically reacted between the anode 12 and the cathode 11 to generate electricity. Heat is generated with the generation of electricity, but exhaust gas containing carbon dioxide, water vapor, nitrogen, etc. is also generated.
[0024]
The heat generated by this electrochemical reaction raises the temperature of the fuel cell 1, but the circulating water flowing through the cooling channel 13 inside the fuel cell 1 exchanges heat with the portion of the fuel cell 1 that has become hot. The heat is taken from the fuel cell 1. As a result, the temperature of the fuel cell 1 decreases, and power generation can be performed efficiently and continuously.
[0025]
In the cooling flow path 13, the circulating water that has become high temperature by exchanging heat with the fuel cell 1 is recovered as heat when passing through the heat recovery device 62, and the water temperature decreases. Then, it again flows in the circulation channel 31 toward the fuel cell 1, but part of the circulation water is discharged from the drainage channel 33. By this draining operation of the circulating water, the amount of the circulating water is reduced in the circulation channel 31 compared to before the draining, so that the water pressure is lowered. In response to the decrease in the water pressure, the new liquid in the water tank 21 is introduced into the circulation channel 31 through the introduction channel 32. Since the water tank 21 is an open system, the pressure applied to the new liquid is atmospheric pressure. Therefore, the amount of the new liquid that compensates for the decrease in the water pressure in the circulation flow path 31 corresponds to the amount of the circulated water discharged. That is, in this fuel cell system, a new liquid corresponding to the drainage amount of the circulating water is naturally introduced into the circulation channel 31 in response to the draining operation of the circulating water. By doing in this way, it is possible to introduce as much new liquid as necessary according to the amount of drainage without introducing a large amount of new liquid into the circulation channel 31 at a stretch. It is also possible to buffer the volume change of the circulating water without being rapidly reduced, and the constituent materials of the circulation channel 31 including the fuel cell 1 can be protected from damage. In this way, old circulating water is drained little by little from the circulation channel 31 and new liquid in the water tank 21 is introduced into the circulation channel 31 according to the amount of drainage. The conductivity can be maintained and stable power generation can be achieved.
[0026]
The draining operation of the circulating water may be either continuous or intermittent, but if it is continuously performed, the new liquid is continuously introduced into the circulation channel 31 from the water tank 21, It is preferable because fluctuations in the temperature of the circulating water can be suppressed to a smaller level. Conversely, if the draining operation is performed intermittently, the new liquid is also intermittently introduced from the water tank 21, so that the consumption of the new liquid is reduced as compared with the case of continuous drainage. Can be preferred.
[0027]
The new liquid stored in the water tank 21 may be any heat medium other than purified water as long as it has a low electrical conductivity. For example, ion-exchanged water or pure water with few impurities can be used. .
[0028]
In addition, it is preferable to control the heat exchange efficiency of the heat recovery device 62 because the temperature of the circulating water can be controlled.
[0029]
As described above, since the water tank 21 is provided outside the circulation flow path 31, it is possible to reduce fluctuations in the temperature of the circulating water, and the fuel cell 1 can be stably operated for power generation.
[0030]
(Second Embodiment)
A second embodiment according to the fuel cell power generation system of the present invention will be described below with reference to FIG. The present embodiment is different from the first embodiment in that an air / water separator 51 is provided in the exhaust flow path 34 of the exhaust gas discharged from the anode 12 and the cathode 11, and the ion exchange resin tank 22 is provided in the middle of the introduction flow path 32. Is to provide.
[0031]
The exhaust gas discharged from the anode 12 and the cathode 11 is in a high temperature state and contains reformed gas, air, water vapor generated by an electrochemical reaction, nitrogen, and the like. Therefore, when the temperature of the exhaust gas in the high temperature state is adjusted by, for example, the heat exchanger 52, the contained water component is condensed, so that the condensed water is separated into the steam by the steam / water separator 51. Then, the condensed water separated from the steam is supplied to the water tank 21 and reused as a new liquid. However, since the condensed water contains some ions, if introduced into the circulation channel 31 as it is, the conductivity of the circulating water is increased. In view of this, the ion exchange resin tank 22 is provided in the introduction channel 32, and the deionization process of the new liquid passing through the introduction channel 32 is performed. Thereby, since deionized condensed water can be introduced into the circulation flow path 31, it is possible to reduce the replenishment amount of purified water to be replenished to the water tank 21 by the condensed water, and the circulating water. Therefore, the fuel cell 1 can be stably operated to generate electric power.
[0032]
The method for purifying the ion exchange resin tank 22 includes a physical purification method and a chemical purification method, and is not particularly limited. However, the removal of particle components using a mesh or a hollow paper membrane, This is performed in combination with removal of ion components using an ion exchange resin.
[0033]
Moreover, as another form of this embodiment, as shown in FIG. 3, the reformer 61 discharges | emits the position which provides the steam separator 51 from the exhaust flow path 34 of the exhaust gas of the anode 12 and the cathode 11. As shown in FIG. There is also a modified gas passage 35 for the reformed gas. In this case, the condensed water condensed when the temperature of the reformed gas is adjusted by, for example, the heat exchanger 52 is separated by the steam separator 51 and the condensed water separated into the water tank 21 is separated. I try to replenish. And since the new liquid accommodated in the water tank 21 is introduced into the circulation channel 31 through the ion exchange resin tank 22, the deionized and purified condensed water is introduced into the circulation channel 31. The amount of purified water supplied to the water tank 21 can be reduced by the amount of the condensed water, and fluctuations in the water temperature of the circulating water can be reduced. Thus, the power generation operation can be performed.
[0034]
  (Reference example)
  According to the fuel cell power generation system of the present inventionReference exampleIs described below with reference to FIG. BookReference exampleThus, the difference from the first embodiment is that a pump 41 for sending water is provided in the introduction flow path 32 that communicates the water tank 21 and the circulation flow path 31. In addition, the same code | symbol is attached | subjected to the same thing as 1st Embodiment.
[0035]
Thus, by providing the pump 41 in the introduction flow path 32, it becomes possible to stably introduce a new liquid into the circulation flow path 31, and to keep the temperature of the circulating water more constant. Thus, it becomes possible to reduce fluctuations in the temperature of the circulating water, and it is possible to cause the fuel cell 1 to stably generate power.
[0036]
In addition, if the delivery amount of the pump 41 can be controlled, the amount of new liquid introduced into the circulation channel 31 can be freely changed. For example, the amount of new liquid introduced can be increased. For example, since the pressure in the circulation channel 31 increases greatly, a large amount of circulating water is drained from the drainage channel 33 so as to return the increased pressure. Thereby, since the ratio of the new liquid in the circulating water in the circulation channel 31 becomes high, the conductivity of the circulating water can be kept lower. On the contrary, if the amount of new liquid introduced is reduced, the increase in pressure in the circulation channel 31 is small, so the amount of drainage from the drainage channel 33 is also reduced, and the conductivity is not greatly reduced. It becomes possible to reduce the consumption of the new liquid.
[0037]
  BookReference exampleAs another form, the position of the pump 41 is changed from the introduction channel 32 to the drain channel 33 as shown in FIG. Thus, if the pump 41 is provided in the drainage flow path 33, the amount of circulating water to be discharged can be controlled. For example, if the amount of drainage is increased, the negative pressure in the circulation channel 31 increases, so a large amount of new liquid is introduced from the water tank 21 so as to return the negative pressure. As a result, the amount of new liquid in the circulation channel 31 increases, and the conductivity of the circulating water can be lowered. On the contrary, if the amount of drainage is reduced, the negative pressure in the circulation channel 31 is also reduced, and the amount of new liquid introduced is also reduced, so that the consumption of new liquid can be reduced. As described above, controlling the amount of the circulating water to be drained indirectly controls the amount of the new liquid introduced. In this case as well, the new amount is stably introduced into the circulation channel 31. The liquid can be introduced, the temperature of the circulating water can be kept more constant, the fluctuation of the water temperature of the circulating water can be reduced, and the fuel cell 1 can be operated stably. Is possible.
[0038]
  (No.3Embodiment)
  The fuel cell power generation system according to the present invention3This embodiment will be described below with reference to FIG. The present embodiment is different from the first embodiment in that the water level detection means 24 that detects the water level in the water tank 21 and the purified water that is replenished to the water tank 21 according to the water level detected by the water level detection means 24. This is to provide a water amount control means 25 for controlling the amount of water. In addition, the same code | symbol is attached | subjected to the same thing as 1st Embodiment.
[0039]
The water amount control means 25 is disposed in the supply passage 36 for purified water to be supplied to the water tank 21, and changes the flow of water in the passage so that it can be circulated / shielded by a shut-off valve. As described above, if the amount of purified water supplied to the water tank 21 is controlled according to the water level in the water tank 21, the amount of the new liquid in the water tank 21 is maintained within a substantially constant range. The new liquid can be stably introduced into the circulation channel 31 and the fluctuation of the temperature of the circulating water can be reduced, and the fuel cell 1 can be stably operated for power generation. Become.
[0040]
The water level detecting means 24 may be anything as long as it can detect the water level. For example, a float type or an optical water level sensor can be used. It may be one that can detect only the height of.
[0041]
Further, as another form of the present embodiment, there is one in which a new liquid is supplied to the water tank 21 in accordance with the amount of circulating water drained from the drain passage 33. This device is provided with a water meter in the drainage flow path 33 and a pump for controlling the open / close time of the shut-off valve according to the result measured by the water meter. That is, the amount of water delivered per second can be calculated from the water pressure delivered from the pump to the water tank 21 and its cross-sectional area, so that the opening time of the shutoff valve is adjusted in accordance with the measurement result of the water meter. I have to. In this way, the amount of water to be drained and the amount of water to be replenished to the water tank 21 can be made substantially coincident, so that the circulating water can be stably introduced into the circulation channel 31 and the circulating water can be introduced. Therefore, the fuel cell 1 can be stably operated to generate electric power.
[0042]
  (No.4Embodiment)
  The fuel cell power generation system according to the present invention4This embodiment will be described below with reference to FIG. The present embodiment differs from the first embodiment in that a heat exchanger 52 provided in the exhaust passage 34 for exhaust gas discharged from the cathode 11 of the fuel cell 1 and a heat exchanger 54 provided in the introduction passage 32 are provided. It is to provide.
[0043]
The heat exchanger 52 exchanges heat with the exhaust gas in a high temperature state discharged from the cathode 11, thereby taking heat from the exhaust gas and transferring the heat to the heat exchanger 54. The heat exchanger 54 applies the heat obtained from the heat exchanger 52 to the new liquid that passes through the introduction flow path 32, and heats the new liquid. By doing in this way, compared with circulating water, a low temperature new liquid can be heated before it introduce | transduces in the circulation flow path 31, and it can approach the water temperature of circulating water, Therefore Circulation by introduction of a new liquid It becomes possible to further reduce the water temperature fluctuation of the water, to efficiently use heat in the entire fuel cell power generation system, and to further reduce the energy required for heating the new liquid. Thus, it becomes possible to reduce fluctuations in the temperature of the circulating water, and it is possible to cause the fuel cell 1 to stably generate power.
[0044]
As another form of the present embodiment, as shown in FIG. 8, the heat exchanger 52 is changed from the exhaust gas exhaust passage 34 exhausted by the cathode 11 to the exhaust exhaust gas passage 34 exhausted by the anode 12. There is something. Even if it does in this way, while being able to reduce more the energy concerning the heating of a new liquid, it becomes possible to reduce the fluctuation | variation of the water temperature of circulating water, and can make the fuel cell 1 carry out power generation operation stably. It becomes possible.
[0045]
  The above4In the embodiment, if the heat exchanger 52 is provided not only in the exhaust flow path 34 of the exhaust gas discharged from the cathode 11 but also in the exhaust flow path 34 of the exhaust gas discharged from the anode 12, Since the heat exchanged by the two heat exchangers 52 can be transferred to the heat exchanger 54, the new liquid can be heated more efficiently, which is preferable.
[0046]
As another form of the present embodiment, there is one provided with a heat exchanger 53 for exchanging heat between the introduction channel 32 and the drain channel 33 as shown in FIG. This is because the heat exchanger 53 exchanges heat with circulating water that is higher in temperature than the new liquid that passes through the drainage flow path 33 and removes the heat, and the deprived heat passes through the introduction flow path 32. It is given to the new solution and heated. This also makes it possible to further reduce the energy required for heating the new liquid and to reduce fluctuations in the temperature of the circulating water, thereby allowing the fuel cell 1 to stably generate power. Is possible.
[0047]
In the present embodiment, the new liquid immediately before being introduced into the circulation flow path 31 is heated by the heat removed by the heat exchangers 52 and 53. However, the heat exchangers 53 and 54 are replaced with the water tank 21. When the purified water is disposed in the purified water replenishment flow path 36 and the purified water is replenished to the water tank 21, the heat removed by the heat exchangers 52 and 53 is applied to the purified water and heated. May be.
[0048]
  (No.5Embodiment)
  The fuel cell power generation system according to the present invention5This embodiment will be described below with reference to FIG. This embodiment is different from the first embodiment in that a heat exchanger 52 that exchanges heat with circulating water flowing in the circulation flow path 31 and heat exchanged by the heat exchanger 52 are supplied to the water tank 21. And a heat exchanger 54 that heats the purified water.
[0049]
By forming in this way, the heat exchanger 52 takes heat from the circulating water having a temperature higher than that of the new liquid and applies the heat to the purified water to be supplied to the water tank 21 to heat the circulating water. The difference in water temperature from the liquid can be reduced. Therefore, when the heated new liquid is introduced into the circulation flow path 31, it is possible to further reduce the fluctuation of the circulating water temperature, and also to reduce the fluctuation of the circulating water temperature. The battery 1 can be stably operated to generate power.
[0050]
In the present embodiment, the heat deprived by the heat exchanger 52 is applied to the purified water to be replenished to the water tank 21 for heating. However, the heat exchanger 54 is disposed in the introduction flow path 32. Thus, the heat taken by the heat exchanger 52 may be applied to the new liquid and heated when it passes through the introduction flow path 32.
[0051]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment and can be implemented in various forms.
[0052]
【The invention's effect】
  As described above, in the fuel cell power generation system according to claim 1 of the present invention, the heat generated in the fuel cell is discharged by exchanging heat with the circulating water flowing in the circulation channel, and a part of the circulating water is discharged. In the fuel cell power generation system that introduces a new amount of water corresponding to the amount of the drained circulating water into the circulation channel while draining water from the circulation channel,A water tank that is disposed outside the circulation flow path and contains a new liquid; and an introduction flow path that communicates the water tank and the circulation flow path. The water tank has a part of its wall surface opened. In addition to communicating with the atmosphere through the open portion, a new amount of water corresponding to the amount of circulating water discharged from the circulation channel is introduced into the circulation channel through the introduction channel.As a result, when the new liquid is introduced into the circulation channel, fluctuations in the temperature of the circulating water can be reduced, and the fuel cell can be stably generated.
[0053]
  According to the fuel cell power generation system of the second aspect of the present invention, in the first aspect of the invention, the water component contained in the reformed gas introduced into the fuel cell or the exhaust gas discharged from the fuel cell is removed. In addition to water separation,WaterAn air / water separator supplied to the tank and a purification device for purifying the new liquid introduced into the circulation flow path are also provided.
[0054]
  According to the fuel cell power generation system of claim 3 of the present invention, in the invention of claim 1 or claim 2,Since the said water tank has the said open part on the upper surface of the wall surface, there exists an effect that the amount of water storage of a water tank can be enlarged..
[0055]
  According to a fuel cell power generation system of a fourth aspect of the present invention, in any one of the first to third aspects,WaterSince the water level detection means for detecting the water level of the new liquid stored in the tank is also provided, in addition to the above effects, there is an effect that the new liquid can be stably introduced into the circulation channel.
[0056]
  According to the fuel cell power generation system according to claim 5 of the present invention, in the invention according to any one of claims 1 to 4, the new liquid is supplied according to the amount of circulating water drained from the circulation channel. UpWaterSince the tank is replenished, in addition to the above effects, there is an effect that it is possible to further reduce fluctuations in the temperature of the circulating water.
[0057]
  According to the fuel cell power generation system according to claims 6 to 9 of the present invention, in the invention according to any one of claims 1 to 5, the new liquid is heated by the heating means and then in the circulation channel. Therefore, in addition to the above effect, the difference in water temperature between the circulating water and the new liquid can be reduced, and the water temperature fluctuations of the circulating water can be further reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a fuel cell power generation system according to the present invention.
FIG. 2 is a diagram showing a second embodiment of a fuel cell power generation system according to the present invention.
FIG. 3 is a diagram showing another embodiment of the fuel cell power generation system.
FIG. 4 shows a fuel cell power generation system according to the present invention.Reference exampleFIG.
FIG. 5 is a diagram showing another embodiment of the fuel cell power generation system.
FIG. 6 shows a fuel cell power generation system according to the present invention.3It is a figure which shows this embodiment.
FIG. 7 shows a fuel cell power generation system according to the present invention.4It is a figure which shows this embodiment.
FIG. 8 is a diagram showing another form of the fuel cell power generation system.
FIG. 9 is a diagram showing still another form of the fuel cell power generation system.
FIG. 10 shows a fuel cell power generation system according to the present invention.5It is a figure which shows this embodiment.
FIG. 11 is a diagram showing a conventional fuel cell power generation system.
[Explanation of symbols]
1 Fuel cell
11 Cathode
12 Anode
21 Water tank
22 Ion exchange resin tank
24 Water level detection means
25 Water volume control means
31 Circulation channel
32 Introduction channel
33 Drainage channel
34 Exhaust flow path
35 Fuel flow path
36 Supply channel
41 pump
51 Water separator
52, 53, 54 heat exchanger

Claims (9)

The heat generated in the fuel cell is discharged by exchanging heat with the circulating water flowing in the circulation channel, and a part of the circulating water is drained from the circulation channel and corresponds to the amount of the drained circulating water. In a fuel cell power generation system that introduces a new amount of water into the circulation channel,
A water tank disposed outside the circulation channel and containing a new liquid;
An introduction flow path communicating the water tank and the circulation flow path,
The water tank is partly open and communicates with the atmosphere through the open part.
A fuel cell power generation system, wherein a new amount of water corresponding to a drainage amount of circulating water from the circulation channel is introduced into the circulation channel via the introduction channel. Reformed gas is introduced into the fuel cell, or the water component of the fuel cell is contained in exhaust gas discharged while the steam-water separator, steam separator and supplies the steam separated water component above Kisui tank The fuel cell power generation system according to claim 1, further comprising a purifier and a purification device for purifying the new liquid introduced into the circulation flow path. 3. The fuel cell power generation system according to claim 1, wherein the water tank has the open portion on an upper surface of a wall surface thereof. 4. The fuel cell power generation system according to any one of claims 1 to 3, characterized in that also provided a water level detecting means for detecting the water level of the fresh solution accommodated in the upper Kisui tank. The fuel cell power generation system according to any one of claims 1 to 4 depending on the amount of water circulating water to drain from the circulation flow path, characterized in that replenishing Shin'eki above Kisui tank. The fuel cell power generation system according to any one of claims 1 to 5, characterized in that also provided a heating means for heating the fresh liquid to be supplied to the new chemical or above Kisui tank, the inlet flow path . It said heating means, the air cathode of the fuel cell is discharged, or by the exhaust gas heat exchange with the anode is discharged, heating the fresh liquid to be supplied to the new chemical or above Kisui tank, the inlet flow path The fuel cell power generation system according to claim 6. The heating means may claim to circulating water heat exchange with effluent from the drain passage, characterized by heating the fresh liquid to be supplied to the new chemical or above Kisui tank, the introduction channel 6 Alternatively, the fuel cell power generation system according to claim 7. It said heating means, and circulating water exchanges heat with the circulating flow path, to claim 6, characterized in that heating the fresh liquid to be supplied to the new chemical or above Kisui tank, the inlet flow path The fuel cell power generation system according to claim 8.

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