JP2014061485A - Apparatus for further purifying pure water, and fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for further purifying pure water, which apparatus has a purification part 21, in which an ion exchange resin C is packed, which resin is contacted with pure water W to be supplied to a pure water utilization device 80 to remove impurities from the pure water W and which apparatus is configured so that a load imposed on the ion exchange resin C for removing impurities in the pure water w is prevented from being increased while suitably performing antibacterial treatment on the pure water W.SOLUTION: The apparatus for further purifying pure water includes: a cation supply part 11 which is disposed on the upstream side of the purification part 21 and which is obtained by packing an antibacterial material A for eluting a cation exhibiting antibacterial properties to the pure water W in a container 10, through which the pure water W is passed, in such a state that the antibacterial material is contacted with the pure water W; and a cation capture part 12 which is disposed on the downstream side of the cation supply part 11 and on the upstream side of the purification part 21 and which is obtained by packing a noble-potential material B, that exhibits the natural potential nobler than that of the antibacterial material A and is connected electrically to the antibacterial material A, in the container 10, through which the pure water W is passed, in such another state that the noble-potential material is contacted with the pure water W.

Description

  The present invention relates to a pure water purification apparatus having a purification section filled with an ion exchange resin that comes into contact with pure water supplied to a pure water utilization apparatus and removes impurities from the pure water, and a fuel cell system including the same. .

In a fuel cell system including a fuel cell, pure water is used as cooling water or reforming water in the fuel cell. In order to reduce the replenishment of pure water from outside the system as much as possible, there may be provided a pure water purifying device that purifies the pure water discharged from the fuel cell and supplies it again to the fuel cell.
Such a pure water purifier has a purifier filled with an ion exchange resin, and the pure water circulating between the pure water utilization devices such as a fuel cell is passed through the purifier to purify the pure water. Water and an ion exchange resin are brought into contact with each other, and impurities such as poisonous components contained in pure water are removed by the ion exchange resin.
However, in some cases, such pure water contains fungi such as genuine bacteria that are organic substances in addition to impurities that are inorganic substances that are captured by the ion exchange resin as described above. When such fungi grow, colony and polysaccharide secretions are generated, which causes blockage of the flow path and filter of the pure water purification device and the pure water utilization device, and hinders stable operation of the pure water utilization device. Problem arises.
Therefore, as a conventional pure water purifier, a device that supplies cations such as silver ions and copper ions having antibacterial properties to such pure water is known in order to suppress the growth of such fungi. (For example, see Patent Document 1).

JP 2009-199808 A

In a conventional pure water purifier, when a cation having antibacterial properties is supplied to pure water, the cation is captured by an ion exchange resin. Therefore, there is a problem that the ion exchange resin captures positive ions in addition to impurities to increase the load, shorten the life of the ion exchange resin, and increase the frequency of replacement with a new one.
The present invention has been made paying attention to such a point, and an object of the present invention is to provide pure water purifying apparatus and a fuel cell system including the pure water purifying apparatus while appropriately performing antibacterial treatment on pure water. The object is to provide a technique capable of preventing an increase in the load of an ion exchange resin for removing impurities.

In order to achieve the above object, a pure water purification apparatus according to the present invention comprises:
A pure water purifying apparatus having a purifying section filled with an ion exchange resin that comes into contact with pure water supplied to a pure water using apparatus and removes impurities from the pure water,
The first characteristic configuration is
An antibacterial material that is disposed upstream of the purification unit and elutes cations that have antibacterial properties against the pure water is filled in a container through which the pure water passes in contact with the pure water. A cation supply unit;
A noble potential material that is disposed downstream of the cation supply unit and upstream of the purification unit and exhibits a natural potential nobler than the antibacterial material in the pure water and is electrically connected to the antibacterial material And a cation trapping part filled in a container through which the pure water passes in a state of being in contact with the pure water.

According to the first characteristic configuration, the pure water supplied to the pure water utilization device comes into contact with the antibacterial material filled in the cation supply unit, so that the antibacterial material is antibacterial against the pure water. A positively charged cation will be supplied. Therefore, the growth of fungi such as true bacteria that are organic substances contained in pure water can be suppressed.
In addition, the pure water containing the cation comes into contact with a noble potential material that exhibits a noble potential more than the antibacterial material filled in the cation capture unit before being supplied to the purification unit. The cations contained in the pure water are trapped in the noble potential material. Therefore, since it can suppress that the cation supplied from the cation supply part reaches | attains downstream ion exchange resin, the increase in the load by capturing the cation in the said ion exchange resin can be prevented.
In addition, the antibacterial material filled in the cation supply unit and the noble potential material filled in the cation capture unit and exhibiting a noble natural potential than the antibacterial material are electrically connected to each other. The flow of electrons from the material to the noble potential material is secured. Therefore, the release of cations by the antibacterial material and the capture of cations by the noble potential material can be maintained.
Therefore, according to the present invention, it is possible to realize a pure water purification apparatus capable of preventing an increase in the load of an ion exchange resin for removing impurities of pure water while suitably performing antibacterial treatment on pure water.

In addition to the first characteristic configuration described above, the second characteristic configuration of the pure water purification apparatus according to the present invention includes:
The antibacterial material filled in the cation supply unit is bronze or nickel copper,
The noble potential material filled in the cation trapping portion is nickel or stainless steel.

According to the second characteristic configuration, even when a relatively large number of cations are supplied to pure water from the cation supply unit so as to exhibit high antibacterial properties, the cations are captured by a noble potential material and the ion exchange resin. Therefore, relatively inexpensive copper or copper alloy can be used as the antibacterial material in order to elute copper ions having a lower antibacterial property than silver ions.
In addition, when copper ions are supplied into pure water from the cation supply unit in this way, it is relatively inexpensive as a noble potential material exhibiting a nobler potential than copper or a copper alloy eluting the copper ions. Nickel or stainless steel can be used.
Therefore, the pure water purification apparatus according to the present invention can be realized at a relatively low cost.

In addition to any of the first to second characteristic configurations described above, the third characteristic configuration of the pure water purification apparatus according to the present invention includes:
The antibacterial material and the noble potential material are filled in the container in a granular, fibrous, cloth-like, or porous state.

According to the third characteristic configuration, since the antibacterial material is filled in the container in a granular, fibrous, cloth-like, or porous state having a relatively large specific surface area in the cation supply unit. By increasing the contact area of the antibacterial material with pure water, a large amount of cations can be supplied to the pure water from the antibacterial material.
Furthermore, since the noble potential material is filled in the container in a granular, fibrous, cloth-like or porous state having a relatively large specific surface area in the cation trapping part, the noble potential material for pure water is used. By increasing the contact area, noble potential material can capture many cations from pure water.

In addition to any of the first to third feature configurations described above, the fourth feature configuration of the pure water purification apparatus according to the present invention includes:
Outward piping for supplying pure water to the pure water utilization device;
A return pipe for returning the pure water discharged from the pure water utilization device;
A circulation pipe for circulating a part of the pure water,
The cation supply unit and the cation capture unit are arranged in the circulation pipe.

  According to the fourth characteristic configuration, the pure water returned from the pure water utilization device via the return pipe is passed through the purification section and subjected to purification treatment, and then supplied to the pure water utilization device via the forward pipe. In this case, a part of the pure water can be circulated through the circulation pipe. And by arranging a cation supply unit and a cation capture unit in this circulation pipe, in a form to recirculate pure water partially, antibacterial treatment by the cation supply unit and cation capture by the cation capture unit Can be repeated.

In addition to the fourth characteristic configuration described above, the fifth characteristic configuration of the pure water purification apparatus according to the present invention includes:
The purifying part is located in the forward piping.

  According to the fifth characteristic configuration, since the purification unit is installed in the outgoing pipe, the pure water is recirculated through the circulating pipe and subjected to the antibacterial treatment and the cation capture repeatedly, and then the outgoing part. The purification treatment by the purification unit can be performed by taking it out to the piping, and the load on the purification unit can be further reduced by reducing the fungi and cations reaching the purification unit.

In addition to any of the fourth to fifth characteristic configurations, the sixth characteristic configuration of the pure water purification apparatus according to the present invention includes:
It has a storage tank that stores pure water inside,
The storage tank receives pure water returned from the return pipe and temporarily stores pure water supplied to the circulation pipe, and receives pure water supplied from the circulation pipe. The second storage part that temporarily stores the pure water supplied to the pure water utilization device is partitioned and formed in a state in which overflow is possible between the partition walls,
A first water pump for sending pure water from the first reservoir to the circulation pipe;
A second water pump for delivering pure water from the second reservoir to the outgoing pipe;
The water supply amount of the first water pump is set to be larger than the water supply amount of the second water pump.

  According to the sixth characteristic configuration, the storage tank is provided in which the first storage portion and the second storage portion are partitioned in a state where overflow between the partition walls is possible, and further, from the first storage portion. The water supply amount of the first water pump that supplies water toward the circulation pipe is set to be larger than the water supply amount of the second water pump that supplies water from the second reservoir to the outward pipe. Then, after passing through the cation supply unit and the cation capture unit in the order of description, antibacterial treatment and cation capture are performed, a part of the pure water flowing into the second storage unit is second water. It is sent to the outgoing pipe by the pump and passes through the purification section and then supplied to the pure water utilization device. The other part overflows to the first storage part via the partition wall and is sent out to the circulation pipe again to be antibacterial. Processing etc. will be performed. Therefore, by adopting such a rational configuration, it is possible to realize a pure water purification apparatus that can sufficiently perform antibacterial treatment and the like in a form in which pure water is partially recirculated.

In addition to any of the first to sixth feature configurations described above, the seventh feature configuration of the pure water purification apparatus according to the present invention includes:
This is in that a potential application unit for applying a negative potential to the noble potential material is provided.

  According to the seventh characteristic configuration, a negative potential is applied to the noble potential material in the cation trapping portion, and the cation capture efficiency of the noble potential material can be maintained high. Further, since the concentration of the cation in the pure water is as small as necessary for the antibacterial treatment of the pure water, the electric power consumed in the potential application unit for capturing the cation is very small.

In addition to any of the first to seventh characteristic configurations, the eighth characteristic configuration of the pure water purification apparatus according to the present invention is:
The pure water utilization device is a fuel cell,
A drain water addition unit for adding drain water of anode off-gas of the fuel cell to pure water flowing into the cation supply unit is provided.

  According to the eighth feature, hydrogen peroxide contained in the drain water of the anode off-gas of the fuel cell is added to pure water by the drain water addition unit, and the hydrogen peroxide is contained by the cation supply unit. Cations are supplied to pure water. Then, in the pure water, hydrogen peroxide reacts with a cation as a catalyst, and a radical having a very strong oxidizing power such as hydroxy radical (.OH) is generated. Therefore, the cell membrane and cell wall of fungi made of proteins and lipids are destroyed by this radical Fenton reaction, so that the fungi can be killed more reliably.

In addition to the eighth characteristic configuration, the ninth characteristic configuration of the pure water purification apparatus according to the present invention includes:
The drain water addition unit is configured to blow the anode off-gas of the fuel cell into pure water flowing into the cation supply unit.

  According to the ninth feature, the anode off-gas drain water is added to the pure water in a rational form by blowing the drain water of the anode off-gas of the fuel cell into the pure water flowing into the cation supply unit. it can.

The fuel cell system according to the present invention for achieving the above object is
A fuel cell;
A fuel cell system comprising a pure water purifier having a purifying unit filled with an ion exchange resin that contacts pure water supplied to the fuel cell and removes impurities from the pure water;
The pure water purification apparatus is characterized by the provision of the pure water purification apparatus according to the present invention, and exhibits the same effects as the above-described pure water purification apparatus according to the present invention.

1 is a schematic configuration diagram of a fuel cell system including a pure water purification device according to a first embodiment. The schematic block diagram of the fuel cell system provided with the pure water purification apparatus of 2nd Embodiment.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIG.
The fuel cell system shown in FIG. 1 includes a fuel cell 80 as a pure water utilization device that uses pure water W as cooling water, and a pure water purification device 1 that purifies the pure water W supplied to the fuel cell 80. . That is, the pure water W purified by the pure water purification apparatus 1 is supplied to the fuel cell 80, while the used pure water W discharged from the fuel cell 80 is returned to the pure water purification apparatus 1.
Since a well-known fuel cell 80 is used, a detailed description thereof will be omitted, but the electric power between hydrogen supplied to the anode electrode on one side and oxygen supplied to the cathode electrode on the other side with the electrolyte membrane interposed therebetween. It generates electricity by chemical reaction. In the fuel cell 80, the anode off-gas G containing hydrogen peroxide generated by the side reaction in addition to unreacted hydrogen is discharged from the anode electrode.
Further, the pure water W purified by the pure water purification apparatus 1 is supplied as cooling water for the fuel cell 80 and also supplied as reforming water for the reforming device 90 that supplies hydrogen to the fuel cell 80. Is done.

The pure water purification apparatus 1 is provided with a purification unit 21 filled with an ion exchange resin C that contacts the pure water W supplied to the fuel cell 80 and removes impurities from the pure water W.
This purifying unit 21 is filled with an ion exchange resin C in a granular, fibrous, cloth-like or porous state having a relatively large specific surface area in an insulating container 20 through which pure water W passes. It is configured as. In addition, as a material which comprises the container 20, the insulating material which does not elute ion in the pure water W as much as possible like a polypropylene, polyamide, a polycarbonate, a fluororesin etc. is utilized suitably.
Then, when the pure water W returned from the fuel cell 80 passes through the purification unit 21, ions in the pure water W are exchanged for hydrogen ions and hydroxide ions, respectively, and they react with each other to form water. In this manner, impurities are removed from the pure water W.

In the pure water purification apparatus 1, pipes through which the pure water W passes include an outward pipe 52 that supplies the pure water W to the fuel cell 80 and a return pipe 53 that returns the pure water W discharged from the fuel cell 80. A circulation pipe 40 for circulating a part of the pure water W is provided. That is, when pure water W returned from the fuel cell 80 via the return pipe 53 is appropriately purified by the purifying unit 21 and then supplied to the fuel cell 80 via the forward pipe 52, the pure water W is supplied. A configuration in which a part of the refrigerant circulates through the circulation pipe 40 is employed.
In the pure water purification apparatus 1 of the first embodiment, the purification unit 21 is disposed in the circulation pipe 40, and the purification process by the purification unit 21 for the pure water W circulating in the circulation pipe 40. Will be given.

The pure water purification apparatus 1 is provided with a storage tank 30 that stores pure water W therein.
The storage tank 30 receives the pure water W returned from the return pipe 53 and temporarily stores the pure water W supplied to the circulation pipe 40 and is supplied from the circulation pipe 40. A second storage portion 32 that receives the pure water W and temporarily stores the pure water W supplied to the fuel cell 80 is partitioned and formed through the partition wall 33 so that overflow between the two is possible. In addition, a first water pump 41 that sends pure water W from the first storage unit 31 toward the circulation pipe 40 and a second water pump 51 that sends pure water W from the second storage unit 32 to the outgoing pipe 52. And are provided.
Therefore, the used pure water W discharged from the fuel cell 80 is temporarily stored in the first storage unit 31 and then supplied to the circulation pipe 40 by the first water pump 41. On the other hand, the pure water W that has passed through the circulation pipe 40 and has been purified by the purification unit 21 disposed in the circulation pipe 40 is temporarily stored in the second storage unit 32, and then is purified by the second water pump 51. The fuel cell 80 is supplied.

Further, the water supply amount of the first water pump 41 is set to be larger than the water supply amount of the second water pump 51. In other words, the flow rate of the pure water W in the circulation pipe 40 is set larger than the flow rate of the pure water W in the second circulation circuit 50.
Then, in the storage tank 30, the amount of pure water W flowing from the circulation pipe 40 into the second storage section 32 is larger than the amount of pure water W flowing into the first storage section 31 from the return pipe 53. The so-called overflow occurs in which part of the pure water W stored in the second storage section 32 passes over the upper edge of the partition wall 33 and flows into the first storage section 31 side.
Therefore, a part of the pure water W flowing into the second storage part 32 after passing through the purification part 21 in the circulation pipe 40 and flowing into the second storage part 32 is forwarded by the second water pump 51 as described above. The other part gets over the upper edge of the partition wall 33, overflows into the first storage part 31, is sent out again to the circulation pipe 40, and is supplied to the purification part 21. As a result, the purification process by the purification unit 21 is repeatedly performed on the pure water W.

The pure water purification apparatus 1 is configured to perform an antibacterial treatment that suppresses the growth of fungi such as true bacteria, which are organic substances contained in the pure water W, in addition to the purification treatment by the purification unit 21. A description will be given below of the configuration.
The cation supply unit 11 is disposed on the upstream side of the purification unit 21 in the circulation pipe 40.
The cation supply unit 11 is antibacterial in a granular, fibrous, cloth-like, or porous state having a relatively large specific surface area in an insulating container 10 through which pure water W passes in the circulation pipe 40. The material A is filled.
The antibacterial material A filled in the cation supply unit 11 is a material that elutes cations having antibacterial properties with respect to the pure water W that comes into contact. In this embodiment, pure water is used as the antibacterial material A. A relatively inexpensive bronze that elutes copper ions as positive ions for W is used.
And in the pure water W to which the cation was supplied by the cation supply part 11, it will be in the state by which the proliferation of fungi was suppressed by the antibacterial action of the cation.
There are many theories about the antibacterial action of cations. For example, hydrogen peroxide produced in the body of fungi reacts with cations as a catalyst to oxidize hydroradicals (.OH) and the like. However, a very strong radical is generated, and the radical may destroy and kill the fungal cell membrane and cell wall.

If pure water W containing cations is supplied to the purification unit 21 as it is, the ion exchange resin C filled in the purification unit 21 captures the cations, thereby loading the ion exchange resin C. There is a problem that the life of the ion exchange resin C is shortened.
Therefore, the cation capturing unit 12 is disposed downstream of the cation supply unit 11 and upstream of the purification unit 21, specifically, between the cation supply unit 11 and the purification unit 21 in the circulation pipe 40. Yes.
The cation capturing unit 12 has a noble potential in a granular, fibrous, cloth, or porous state having a relatively large specific surface area in an insulating container 10 through which pure water W passes in the circulation pipe 40. The material B is filled.
The noble potential material B filled in the cation trapping portion 12 is a material that exhibits a natural potential more noble than the antibacterial material A in pure water W. In this embodiment, as the noble potential material B, bronze or A relatively inexpensive stainless steel that exhibits a natural potential more noble than nickel copper is used.
In addition, the antibacterial material A and the noble potential material B are filled in the same container 10 in a stacked state so that the noble potential material B is positioned downstream of the antibacterial material A. With this configuration, the noble potential material B is electrically connected to the antibacterial material A.

Since the cation capturing unit 12 is thus provided, the cation supplied by the cation supplying unit 11 is filled in the cation capturing unit 12 before being supplied to the purification unit 21. As a result, an increase in the load of the ion exchange resin C filled in the purification unit 21 is prevented.
In addition, since the antibacterial material A and the noble potential material B are electrically connected in a state where they are in contact with each other in the container 10, surplus electrons are released from the antibacterial material A by elution of cations. The release of the cation by the antibacterial material A and the capture of the cation by the noble potential material B are maintained in a form that flows to B and is used for cation capture.

As the material constituting the container 10, an insulating material that does not elute ions as much as possible in the pure water W, such as polypropylene, polyamide, polycarbonate, fluororesin, etc., is suitable as in the case of the container 10 of the purification unit 21. Has been used.
Further, as described above, the cation supply unit 11, the cation capture unit 12, and the purification unit are set by setting the flow rate of the pure water W in the circulation pipe 40 larger than the flow rate of the pure water W in the forward pipe 52. Part of the pure water W that has passed through the circulation pipe 40 in which the 21 is disposed is sent out to the circulation pipe 40 again, so that not only the purification process by the purification unit 21 but also the antibacterial by the cation supply of the cation supply unit 11 The treatment and cation capture are repeated.

A direct current power source 70 is connected to the noble potential material B filled in the cation capturing unit 12 as a potential application unit that applies a negative potential to the noble potential material B.
Therefore, electrons for capturing cations are sufficiently supplemented from the direct current power source 70 to the noble potential material B, so that the cation capturing efficiency is kept high.

Furthermore, the pure water purification apparatus 1 employs a configuration for more reliably sterilizing fungi such as genuine bacteria that are organic substances contained in the pure water W, and the detailed configuration will be described below.
A drain water addition tank 60 is arranged in the return pipe 53 as a drain water addition unit for adding drain water of the anode off-gas G of the fuel cell 80 to the pure water W flowing into the cation supply unit.
The drain water addition tank 60 is configured to temporarily store the used pure water W discharged from the fuel cell 80. Further, the stored pure water W is disposed in a state in which the tip of the nozzle 61 that blows out the anode off gas G discharged from the fuel cell 80 is immersed. The so-called bubbling is performed by blowing the anode off gas G from the nozzle 61 into the pure water W stored in the drain water addition tank 60, so that the drain water of the anode off gas G is reduced in the pure water W. .
Further, since the anode off gas G contains hydrogen peroxide generated by the side reaction in the fuel cell 80, the pure water W supplied with the drain water also contains hydrogen peroxide. .

Since the hydrogen peroxide contained in the pure water W increases as compared with the amount produced by the fungi in this way, it reaches the cation supply unit 11 via the first storage unit 31 and the first water pump 41. When the cation is supplied, the hydrogen peroxide reacts with the cation as a catalyst, and a radical having a very strong oxidizing power such as a hydroxy radical (.OH) is generated in a larger amount. As a result, the fungi contained in the pure water W are more completely killed by the Fenton reaction of this radical, destroying cell membranes and cell walls made of proteins and lipids.
In addition, radicals remaining in the pure water W after killing the fungi are unstable and disappear in a very short time, so that it is not possible to damage the ion exchange resin or the like of the purification unit 21 disposed in the subsequent stage. Absent.
On the other hand, in the present embodiment, a configuration in which pure water W containing hydrogen peroxide is temporarily stored in the first storage unit 31 of the storage tank 30 is employed, and therefore, the storage tank 30 is provided with a water supply valve 34. It is possible to kill or suppress the growth of fungi in the supplied water SW to some extent by the sterilizing power of hydrogen peroxide itself.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The fuel cell system and the pure water purification apparatus 2 shown in FIG. 2 differ from the first embodiment described above only in the location where the purification unit 21 is disposed. Accordingly, other similar configurations are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.

In the pure water purification apparatus 2 shown in FIG. 2, the purification unit 21 is arranged not in the circulation pipe 40 but in the forward pipe 52. Even when such a configuration is adopted, it can be said that the cation capturing unit 12 is disposed downstream of the cation supply unit 11 and upstream of the purification unit 21 in the flow direction of the pure water W.
That is, one of the pure waters W that flows into the second storage unit 32 after passing through the cation supply unit 11 and the cation capturing unit 12 and being subjected to antibacterial treatment and cation capturing in the circulation pipe 40. As described above, the part is sent to the forward piping 52 by the second water pump 51 and supplied to the fuel cell 80 after being purified by the purification unit 21, but the other part gets over the upper edge of the partition wall 33. Thus, it overflows into the first reservoir 31 and is sent again to the circulation pipe 40 and supplied to the cation supply unit 11 and the like, and as a result, the purification process and the like are repeatedly performed on the pure water W. become. Therefore, fungi and cations reaching the purification unit 21 are reduced, and the load on the purification unit 21 is further reduced.

[Other Embodiments]
Finally, other embodiments of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.
(1) In the above embodiment, the example in which the pure water purification apparatus 1 according to the present invention is applied to a fuel cell system including the fuel cell 80 has been described. However, a system including a pure water utilization apparatus other than the fuel cell 80 The present invention can also be applied as appropriate.

(2) In the above embodiment, bronze that elutes copper ions into the pure water W is used as the antibacterial material A filled in the cation supply unit 11, but as the antibacterial material A, Any material that elutes cations having antibacterial properties may be used. For example, nickel copper that elutes copper ions from pure water W or copper itself can be used.

(3) In the above-described embodiment, stainless steel is used as the noble potential material B filled in the cation trapping unit 12. However, as the noble potential material B, a natural potential that is noble than the antibacterial material A in pure water W is used. For example, nickel, other metal, or noble metal whose surface is passivated can be used.

(4) In the above embodiment, the storage tank 30 is provided to temporarily store the pure water W. Separately, the pure water W returned from the fuel cell 80 is directly supplied to the cation supply unit. 11, pure water W, such as passing through the cation capturing unit 12 and the purifying unit 21 in the order described to perform antibacterial treatment and purification treatment, and supplying the pure water W directly to the fuel cell 80. These flow circuits may be modified as appropriate.

(5) In the above embodiment, the drain water addition tank 60 configured to bubble the anode off-gas G in the pure water W returned from the fuel cell 80 is provided, but instead stored in the storage tank 30. The anode off gas G may be directly bubbled into the pure water W to be produced. The drain water addition unit for supplying the drain water of the anode off-gas G of the fuel cell 80 to the pure water W is not the bubbling of the anode off-gas G into the pure water W as in the drain water addition tank 60, The off-gas G may be condensed to generate drain water in advance, and the drain water may be added to the pure water returned from the fuel cell 80. Further, the arrangement location of the drain water addition unit is not limited to the outlet side of the fuel cell 80, and may be arranged, for example, on the upstream side of the cation supply unit 11 in the circulation pipe 40.

  The present invention relates to a pure water purification device having a purification unit filled with an ion exchange resin that contacts impurities with pure water supplied to the pure water utilization device and removes impurities from the pure water, and a fuel cell system including the same. It can be suitably used.

1, 2: Pure water purification apparatus 10, 20: Container 11: Cation supply unit 12: Cation capture unit 21: Purification unit 30: Storage tank 31: First storage unit 32: Second storage unit 33: Septum 40: Circulation piping 41: 1st water pump 51: 2nd water pump 52: Outward piping 53: Return piping 60: Drain water addition tank (drain water addition part)
70: DC power supply (potential application unit)
80: Fuel cell 90: Reformer A: Antibacterial material B: Noble potential material C: Ion exchange resin G: Anode off gas W: Pure water

Claims (10)

A pure water purifying apparatus having a purifying section filled with an ion exchange resin that comes into contact with pure water supplied to a pure water using apparatus and removes impurities from the pure water,
An antibacterial material that is disposed upstream of the purification unit and elutes cations that have antibacterial properties against the pure water is filled in a container through which the pure water passes in contact with the pure water. A cation supply unit;
A noble potential material that is disposed downstream of the cation supply unit and upstream of the purification unit and exhibits a natural potential nobler than the antibacterial material in the pure water and is electrically connected to the antibacterial material And a cation trapping unit filled with a container through which the pure water passes in a state of being in contact with the pure water. The antibacterial material filled in the cation supply unit is bronze or nickel copper,
The pure water purifier according to claim 1, wherein the noble potential material filled in the cation trapping unit is nickel or stainless steel.   The pure water purification apparatus according to claim 1 or 2, wherein the antibacterial material and the noble potential material are filled in the container in a granular, fibrous, cloth-like, or porous state. Outward piping for supplying pure water to the pure water utilization device;
A return pipe for returning the pure water discharged from the pure water utilization device;
A circulation pipe for circulating a part of the pure water,
The pure water purification apparatus according to any one of claims 1 to 3, wherein the cation supply unit and the cation capture unit are arranged in the circulation pipe.   The pure water purification apparatus according to claim 4, wherein the purification unit is disposed in the forward piping. It has a storage tank that stores pure water inside,
The storage tank receives pure water returned from the return pipe and temporarily stores pure water supplied to the circulation pipe, and receives pure water supplied from the circulation pipe. The second storage part that temporarily stores the pure water supplied to the pure water utilization device is partitioned and formed in a state in which overflow is possible between the partition walls,
A first water pump for sending pure water from the first reservoir to the circulation pipe;
A second water pump for delivering pure water from the second reservoir to the outgoing pipe;
The pure water purification apparatus according to claim 4 or 5, wherein a water supply amount of the first water pump is set larger than a water supply amount of the second water pump.   The pure water purification apparatus according to any one of claims 1 to 6, further comprising a potential applying unit that applies a negative potential to the noble potential material. The pure water utilization device is a fuel cell,
The pure water purifier according to any one of claims 1 to 7, further comprising a drain water addition unit that adds drain water of anode off-gas of the fuel cell to pure water flowing into the cation supply unit.   The pure water purifier according to claim 8, wherein the drain water addition unit is configured to blow the anode off gas of the fuel cell into the pure water flowing into the cation supply unit. A fuel cell;
A fuel cell system comprising a pure water purifier having a purifying unit filled with an ion exchange resin that contacts pure water supplied to the fuel cell and removes impurities from the pure water;
The fuel cell system provided with the pure water purification apparatus of any one of Claims 1-9 as the said pure water purification apparatus.

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