JP3290395B2 - Direct contact type condensed water recovery system for fuel cell and direct contact type steam condenser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct contact type condensed water recovery system for a fuel cell and a direct contact type steam condenser for recovering water from a fuel cell exhaust gas and treating the recovered water.

[0002]

2. Description of the Related Art FIG. 2 is a structural explanatory view showing an example of water recovery from a conventional fuel cell. In the figure, 101 is a fuel cell system, 102 is a reformer, 103 is a burner in the reformer,
104 is a reformer combustion exhaust gas supply pipe, 105 is an air electrode exhaust gas supply pipe, 106 is a gas-water system partition type steam condenser for collecting exhaust gas water, 107 is a secondary cooling water circulation pump, 10
8 is secondary cooling water, 109 is a cooling tower, 110 is an exhaust pipe, 1
11 is a condensed water pipe, 112 is a water tank, 113 is a condensed water pump, 114 is a water treatment device, 115 is an ion exchange resin, 116 is an air electrode, 117 is a fuel electrode, 118 is a cooling unit, 119 is a heat utilization device, 120 is a steam separator, 12
1 is steam, 122 is steam, 123 is battery cooling water, 1
24 is city gas, and 125 is air.

[0003] First, a mixed gas obtained by mixing city gas 124 as a raw fuel and steam 122 supplied from a steam separator 120 in the fuel cell system 101 is supplied to a reformer 102.
And reacts the city gas 124 with the water vapor 122 supplied from the water vapor separator 120 to generate hydrogen as the main fuel. In the reformer 102, a steam reforming reaction is performed in which city gas (hydrocarbon mainly composed of methane) 124 and steam 122 are reacted on a catalyst to generate hydrogen. Since this reaction is an endothermic reaction, surplus hydrogen discharged from the fuel electrode 117 is burned by the burner 103 in the reformer 102 in order to maintain the reformer 102 at a constant temperature. As a result, the combustion exhaust gas from the reformer 102 is discharged as a mixed gas of carbon dioxide, steam, nitrogen, and oxygen. The reformer combustion exhaust gas passes through a reformer combustion exhaust gas supply pipe 104 and is guided to an exhaust gas water recovery gas-water system partition type steam condenser 106.

On the other hand, heat generated by the power generation reaction at the air electrode 116 and the fuel electrode 117 is recovered by the battery cooling water 123 in the cooling section 118. The battery cooling water from which heat has been recovered is guided to a heat utilization device 119 such as an absorption refrigerator through a steam separator 120. Further, the exhaust gas of the air electrode 116 in which the oxygen in the air 125 is used for the power generation reaction and the water vapor generated by the power generation reaction are guided from the air electrode 116 by the air electrode exhaust gas supply pipe 105 as a mixed gas of water vapor, nitrogen, and oxygen. Also, the gas is guided to the exhaust gas water collecting gas-water system partition type steam condenser 106 and mixed therein with the reformer combustion exhaust gas.

[0005] Conventionally, a gas-water partition wall type steam condenser 106 for collecting exhaust gas water, which is a partition type heat exchanger via a metal surface, has been used for recovering water from exhaust gas. As shown in FIG. 2, the secondary cooling water circulating pump 107 is provided with a circulating force to circulate and radiate heat in the cooling tower 109.
The secondary cooling water 108 performs heat exchange between the reformer combustion exhaust gas and the mixed exhaust gas of the air electrode exhaust gas in the exhaust gas water recovery gas-water system partition type steam condenser 106.

By the above heat exchange, the mixed exhaust gas of the reformer combustion exhaust gas and the air electrode exhaust gas is cooled in the exhaust gas water recovery gas-water partition wall type steam condenser 106. As a result, the water vapor contained in the exhaust gas is condensed, and condensed water is generated. This condensed water is collected in a water tank 112 through a condensed water pipe 111. Further, the remaining exhaust gas components are discharged to the outside air through the exhaust pipe 110. The condensed water stored in the water tank 112 is sent to a water treatment device 114 via a condensed water pump 113 and the ion exchange resin
After removing carbon dioxide gas, phosphoric acid, etc., which are slightly remaining, to make pure water, it is reused as makeup water for fuel cell cooling water. The make-up water is pure water in order to ensure electrical insulation at the air electrode and the fuel electrode by its low electric conductivity.

[0007]

In the conventional water recovery from a fuel cell, a gas-water system and a water-water system partition type steam condenser through a metal surface are used as the steam condenser. This bulkhead type steam condenser is expensive and has a large volume and a large mass. Further, since a water tank for collecting the condensed water generated by cooling the exhaust gas is required, there is a disadvantage that the cost and volume of the fuel cell system body are increased. In addition, the removal of carbon dioxide and phosphoric acid contained in the condensed water is performed by an ion exchange resin in a water treatment apparatus. To maintain the electric conductivity of the treated water within a certain value, the ion exchange resin is removed by 2 to 3 times. They had to be replaced every month. Further, since the phosphoric acid contained in the condensed water adheres to the inside of the bulkhead type steam condenser and the condensed water pipe, cleaning to remove the phosphoric acid stops the fuel cell and stops the entire steam condenser and the condensed water pipe. Had the drawback that it would be necessary to go inside.

The present invention has been made in view of the above circumstances, and provides a direct contact type condensed water recovery system and a direct contact type steam condenser for a fuel cell which are extremely economical, compact and easy to maintain. The purpose is to:

[0009]

According to the present invention, a fuel cell exhaust gas, which is a mixed gas of a reformer exhaust gas and an air electrode exhaust gas, is guided to a lower part of a direct contact type steam condenser, and By performing exhaust gas cooling by direct contact with gas cooling water sprinkled from near the exhaust gas inlet,
It is characterized by enabling highly efficient condensed water recovery with low pressure loss.

Further, in the present invention, the direct contact steam condenser has a structure in which a plurality of semicircular shelves with perforations are vertically combined in a plurality of stages, and the semicircular shelves with perforations have an aperture ratio (the direct contact type). 15 to 30%, which indicates the ratio of the area not occupied by the shelf to the cross-sectional area of the steam condenser.
^The number of holes per ² is 3200 to 4000, the hole diameter is 3 to 7 mm, and the number of shelves per 1 m of the height of the gas cooling section is 6 to 14.

Further, according to the present invention, a part of the condensed water sent from the condensed water reservoir to the cooling tower via the circulation pump is returned to the decarbonation means of the condensed water reservoir again, and the side wall extends inward from the outer wall. The nozzle with a jet pump, which is mounted as described above and has an air intake for taking in outside air, blows out into the condensed water reservoir together with the air sucked from the air intake by a jet pump effect without power. Thereby, the carbon dioxide component contained in the exhaust gas condensed water can be gasified and removed, and can be discharged from the air discharge port.

The present invention also provides a dephosphorizing means which is adjacent to the decarburizing means and is separated from the decarboxylating means by a second partition plate having a height lower than the water surface. Is vertically divided by a third partition plate made of two metal wire meshes having a height higher than the water surface sandwiching a highly transparent retainer, and a DC voltage is applied between the two metal wire meshes. The method is characterized in that phosphoric acid can be removed by performing electrolysis, and cleaning is facilitated by replacing the wire mesh.

The conventional condensed water recovery system for a fuel cell is different from a bulkhead type steam condenser in that a direct contact type steam condenser that is inexpensive, small, and highly efficient is applied, and a special decarbonation device is not required. The difference is that the removal and cleaning of phosphoric acid can be easily performed, and the frequency of replacement of expensive ion exchange resin is reduced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration explanatory view showing an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing an example of a direct contact steam condenser of FIG. 1, and FIG. It is an enlarged plan view showing an example. In the figure,
1 is a fuel cell system, 2 is a burner in a reformer, 3 is a reformer, 4 is a reformer combustion exhaust gas supply pipe, 5 is an air electrode exhaust gas supply pipe, 6 is a direct contact steam condenser, and 7 is a direct condenser. Exhaust gas inlet of a contact type steam condenser, 8 is a gas cooling unit, 9 is a semicircular shelf with perforations, 901 is a number of holes provided in the semicircular shelf 9, 10 is a gas cooling water inlet, 11 is gas Cooling water spray nozzle, 12 is gas cooling water, 13 is exhaust pipe, 14 is first
15 is a jetting water pipe for air bubbling, 16 is a decarbonation means, 17 is an air intake, 18 is a nozzle with a jet pump, 19 is an air outlet, 20 is a second partition, and 21 is dephosphorization. Acid means, 22 a third partition plate made of two metal meshes sandwiching a retainer, 23 a DC power supply, 24 a condensed water reservoir, 25 a water level detecting device, 26 a condensed water outlet, and 27 a circulation Pump, 28 is a branch valve, 29 is a cooling tower, 30 is a flow control valve, 31 is a battery cooling water pump,
32 is a water treatment device, 33 is an ion exchange resin, 34 is an air electrode, 35 is a fuel electrode, 36 is a cooling unit, 37 is a heat utilization device,
38 is a steam separator, 39 is steam, 40 is steam, 4
1 is battery cooling water, 42 is city gas, and 43 is air.
As shown in FIG. 2, a plurality of semicircular shelves 9 with perforations are installed inside the direct contact steam condenser 6 at equal intervals in the vertical direction while facing each other. The plate 9 is provided with a number of holes 901 as shown in FIG. Note that the gas cooling water spray nozzle 11 is omitted in FIG. 2, and a part of the hole 901 is omitted in FIGS. 2 and 3.

That is, the reformer combustion exhaust gas discharged from the reformer 3 by the combustion of the burner 2 in the reformer is discharged from the reformer combustion exhaust gas supply pipe 4 and the air electrode exhaust gas discharged from the air electrode 34 is discharged. After being guided by the cathode exhaust gas supply pipe 5 and merging with the reformer combustion exhaust gas supply pipe 4, both exhaust gases are mixed and then sent to the lower exhaust gas inlet 7 of the direct contact steam condenser 6.

In the gas cooling section 8 inside the direct contact steam condenser 6, the exhaust gas is supplied to a plurality of semicircular shelves 9
The gas is cooled by meandering upward while meandering in the interior partitioned by the gas cooling water inlet 10 and the gas cooling water 12 sprinkled from the spray nozzle 11 near the exhaust gas inlet by counterflow. Condenses the water vapor inside. At this time, the semicircular shelf 9 with perforations is configured with an optimal opening ratio, the number of holes, the hole diameter, and the interval between the shelves for cooling the gas with low pressure loss and high efficiency.

The exhaust gas sufficiently cooled by the gas cooling water 12 is discharged from an exhaust pipe 13. The gas cooling water 12 that has cooled the exhaust gas and the condensed water that has been collected are separated by the first partition plate 1.
The water drops fall into the condensed water storage section 24 of the direct contact steam condenser partitioned by 4 and is stored.

On the other hand, a part of the condensed water sent to the cooling tower 29 via the circulation pump 27 and the branch valve 28 passes through the jetting water pipe 15 for air bubbling, and the decarbonation means 16 on the bottom side surface of the condensed water storage part 24. From the nozzle 18 with a jet pump having an air inlet 17 on the outside, and squirts into the condensed water reservoir 24 together with the air sucked from the air inlet 17 by the jet pump effect to generate a rotating water flow inside. Let it. The ejected air removes carbon dioxide contained in the exhaust gas condensed water by a degassing action and is discharged to the outside through an air discharge port 19 provided above the condensed water reservoir 24.

After the condensed water bubbled by the air passes through the second partition plate 20, the condensed water is sandwiched by a plurality of third partition plates 22 as retainers in the next dephosphorizing means 21. It passes through two metal wire meshes. Said 2
A DC voltage is applied between the wire meshes by the DC power supply device 23, and the phosphoric acid contained in the exhaust gas condensed water is precipitated and removed as a phosphate compound when passing through. The precipitated phosphate compound is easily removed by replacing the wire mesh with the retainer.

The dephosphorized condensed water is supplied to the condensed water outlet 26
Is sent to the cooling tower 29 via the branch valve 28 by the circulation pump 27 and cooled. After being cooled in the cooling tower 29, one of them is again sprayed through the flow control valve 30 from the gas cooling water inlet 10 at the upper part of the direct contact steam condenser 6 and the spray nozzle 11 near the lower exhaust gas inlet 7, and Is sent to a water treatment device 32 via a battery cooling water pump 31. Although this condensed water has been subjected to decarboxylation and dephosphorylation in the decarboxylation means 16 and dephosphorylation means 21, the decarbonation means 16 and dephosphorylation means 21
Since iron ions and the like, which are components not to be removed in the process, are dissolved, the pure water is removed therefrom by the ion exchange resin 33 in the water treatment device 32, and then the air electrode is used as replenishing water for battery cooling water. 34 and to the cooling part 36 of the fuel electrode 35. The flow control valve 30 is electrically connected to a water level detecting device 25 installed in the condensed water storage unit 24, and the opening of the flow control valve 30 is adjusted according to the water level of the condensed water storage unit 24, and battery cooling is performed. The flow toward the water pump 31 is controlled.

In the direct contact condensed water recovery system for a fuel cell according to the present invention, the fuel cell exhaust gas, which is a mixed gas of the exhaust gas from the reformer 3 and the exhaust gas from the air electrode 34, is guided to the lower part of the direct contact steam condenser 6. The gas cooling is performed by directly contacting the gas cooling water 12 sprayed from the spray nozzle 11 near the upper gas cooling water inlet 10 and the exhaust gas inlet 7. On this occasion,
The water vapor contained in the exhaust gas is cooled, releases latent heat and condenses. The condensed water is stored in the condensed water storage section 24 provided at the lowermost part of the direct contact steam condenser 6 together with the gas cooling water sprinkled from the upper part and the vicinity of the exhaust gas inlet.

At this time, when the opening ratio of the perforated semicircular shelf 9 for gas cooling is less than 15%, the pressure loss of the exhaust gas increases, and when it exceeds 30%, the gas cooling efficiency decreases, so Appropriate. In the case the number of holes 1 m ² per shelves 9 is less than 3200, cause a decrease in gas cooling efficiency,
When the number exceeds 4,000, although the gas cooling efficiency is increased, it is extremely small, and therefore, it becomes inappropriate in consideration of the processing cost. The hole diameter of the shelf 9 is 3
If it is less than 7 mm, the cooling water drops and the cooling efficiency decreases, and if it exceeds 7 mm, the cooling water drops in a columnar shape and the contact area with the exhaust gas decreases significantly, so the cooling efficiency also decreases. It becomes inappropriate. Further, when the number of the shelf plates 9 per 1 m height of the gas cooling unit 8 is less than 6, the required drop time from the water outlet of the gas cooling water to the condensed water storage unit 24,
That is, the contact time between the exhaust gas and the gas cooling water is shortened, so that the gas cooling efficiency is reduced. If the number exceeds 14, the gas cooling efficiency is increased, but the meandering of the exhaust gas is sharpened, and the pressure loss is increased, which is inappropriate. Becomes

Accordingly, the semicircular shelf 9 with a hole has an aperture ratio of 1
5 to 30%, the number of holes per 1 m ^{2 of the} shelf 9 is 3200 to 4000, the hole diameter is 3 to 7 mm, and the number of the shelves 9 per 1 m of the height of the gas cooling section 8 is 6 Or 14 pages.

On the other hand, the condensed water reservoir 24
A part of the water sent to the cooling tower 29 via 7 is returned to the decarbonation means 16 of the condensed water storage part 24 again, and is jetted from the nozzle 18 with the jet pump into the condensed water storage part 24. The nozzle 18 with a jet pump has an air intake 17 outside the direct contact type steam condenser 6 and, when jetting water, causes the air sucked from the air intake 17 to be jetted together by the jet pump effect.

The nozzle 18 with the jet pump
Is installed along the bottom side surface of the condensed water storage section 24 having a vertical cylindrical shape, so that a rotating water flow is generated in the condensed water storage section 24 and the gas cooling water sprinkled from the upper gas cooling water inlet 10. The water, condensed water from the exhaust gas, and the jetted air are stirred while being in sufficient contact. Thereby, the carbon dioxide gas contained in the exhaust gas condensed water comes into contact with air having an extremely low carbon dioxide gas concentration, and is thereby removed by the degassing action.

The air from which the carbon dioxide gas has been degassed is discharged outside through an air discharge port 19 provided separately. At this time, since the gas cooling unit 8 above the direct contact steam condenser 6 is partitioned by the first partition plate 14, the carbon dioxide gas is not taken into the exhaust gas again. Further, since it does not mix with the exhaust gas, there is no possibility that the partial pressure of water vapor in the exhaust gas is reduced. Therefore, there is no danger of lowering the condensation temperature of the water vapor in the exhaust gas and reducing the amount of condensed water recovered.

The condensed water thus decarbonated and stored passes through the second partition plate 20, and passes through the third partition plate 22, a dephosphorizing means 21 separated by a metal wire mesh. It is led to. The dephosphorizing means 21 is composed of two metal wire meshes having a height from the bottom to the surface of the water to which a retainer having a high water permeability is sandwiched and electrically connected to each other to apply a DC voltage. A plurality of third partition plates 22 are provided. When condensed water passes between the wire meshes, the phosphoric acid contained in the condensed water reacts with the metal and precipitates as a phosphate compound. Since this phosphate compound is insoluble in water, it can be adsorbed on a retainer, thereby removing phosphoric acid. Here, the material of the wire netting is most preferably inexpensive aluminum, which has a feature that it easily reacts with phosphoric acid and precipitates a gel-like aluminum phosphate, so that it can be easily adsorbed to a retainer. You may.

Cleaning can be easily performed by replacing the wire mesh with the retainer. The condensed water from which phosphoric acid has been removed in this way is sent to the cooling tower 29 via the circulation pump 27. This makes it possible to collectively perform water recovery from the exhaust gas and decarboxylation and dephosphorization of the collected condensed water by one unit. After the condensed water is cooled by the cooling tower 29, the condensed water is guided to the upper part of the direct contact type steam condenser 6 via the flow control valve 30, and is sprayed again as the gas cooling water 12. The condensed water storage unit 24 is provided with a water level detection device 25 electrically connected to the flow control valve 30. When the condensed water from the exhaust gas gradually increases and exceeds a specified water level. The flow control valve 30 is opened by an electric signal, and excess condensed water is guided again to the air electrode and fuel electrode cooling unit 36 via the pump 31 and the water treatment device 32 as battery cooling water, and is reused.

[0029]

EXAMPLES The effects of the above embodiment were confirmed by experiments. That is, 1150 kg of 170 ° C. exhaust gas containing 0.17 kg of water vapor, 0.09 kg of carbon dioxide gas, and a trace amount of phosphoric acid per kg is fed from the lower exhaust gas inlet 7, and a flow rate of 18,000 kg / h at a water temperature of 30 ° C.
Was sent to the direct contact type steam condenser 6 to cool the exhaust gas. At this time, a semicircular shelf 9 with a hole
Has an aperture ratio of 25%, 3650 holes per 1 m ^2, a hole diameter of 5 mm, and eight shelves per 1 m of gas cooling unit height.

As a result, the exhaust gas passes through the exhaust pipe 13
It was cooled to 8 ° C., and 135 kg of condensed water was obtained. Further, the concentration of carbon dioxide in 1 L of condensed water was suppressed to 0.002 g, and the concentration of phosphoric acid was suppressed to less than 1 ppm. As is apparent from the results, it was confirmed that the present invention can easily and collectively perform highly efficient condensed water recovery, decarboxylation and dephosphorization.

It has also been confirmed that the decarboxylation and dephosphorylation treatments can increase the exchange frequency of the ion exchange resin in the water treatment device from the conventional 2 to 3 months every 5 to 6 months.

Further, the volume of the direct contact type steam condenser and the condensed water storage section is 0.65 m ^3, which is a volume ratio as compared with the case where the conventional partition type steam condenser and the condensed water recovery water tank are used. Approximately 60% downsizing was achieved.

[0033]

As described above, according to the present invention, the decarbonation means which is divided by the gas cooling part of the direct contact steam condenser and the first partition plate and has a nozzle with a jet pump at the lower part, A condensed water reservoir, an exhaust gas inlet, and a dephosphorization means having a second partition plate separating the decarbonation unit and a third partition plate provided with a plurality of two metal wire meshes sandwiching a retainer; By a direct contact steam condenser with a very simple structure consisting of a gas cooling unit and a condensate outlet,
It is possible to recover water from the reformer combustion exhaust gas and the air electrode exhaust gas, and remove carbon dioxide and phosphoric acid.

Further, the cleaning for removing the phosphoric acid can be performed very easily by replacing the third partition plate. As a result, the conventional expensive and large-volume, heavy-weight bulkhead-type steam condenser or water tank is not required, and the frequency of replacing expensive ion-exchange resin is reduced. Therefore, the present invention is extremely economical and compact. It is possible to provide a direct contact condensed water recovery system and a direct contact steam condenser for a fuel cell which are easy to maintain.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing an example of the direct contact steam condenser of FIG.

FIG. 3 is an enlarged plan view showing an example of a semicircular shelf board with perforations shown in FIG. 1;

FIG. 4 is a configuration explanatory view showing an example of a conventional fuel cell condensed water recovery system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel cell system 2 ... Burner in a reformer 3 ... Reformer 4 ... Reformer combustion exhaust gas supply pipe 5 ... Air electrode exhaust gas supply pipe 6 ... Direct contact steam condenser 7 ... Direct contact steam condenser exhaust gas Inlet 8 ... Gas cooling unit 9 ... Semicircular shelf board with perforations 10 ... Gas cooling water inlet 11 ... Gas cooling water spray nozzle 12 ... Gas cooling water 13 ... Exhaust pipe 14 ... First partition plate 15 ... Ejection for air bubbling Water pipe 16 ... Decarbonation means 17 ... Air intake 18 ... Nozzle with jet pump 19 ... Air outlet 20 ... Second partition plate 21 ... Dephosphorization means 22 ... Second metal wire mesh sandwiching a retainer 3 partition plate 23 DC power supply 24 condensed water reservoir 25 water level detecting device 26 condensed water outlet 27 circulation pump 28 branch valve 29 cooling tower 30 flow control valve 31 battery cooling water pump 3 2 ... Water treatment apparatus 33 ... Ion exchange resin 101 ... Fuel cell system 102 ... Reformer 103 ... Burner in the reformer 104 ... Reformer combustion exhaust gas supply pipe 105 ... Air electrode exhaust gas supply pipe 106 ... Exhaust gas water recovery gas -Water system partition type steam condenser 107 ... Secondary cooling water circulation pump 108 ... Secondary cooling water 109 ... Cooling tower 110 ... Exhaust pipe 111 ... Condensed water pipe 112 ... Water tank 113 ... Condensed water pump 114 ... Water treatment device 115 ... Ion Exchange resin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-28483 (JP, A) JP-A-61-39371 (JP, A) JP-A-3-179674 (JP, A) JP-A-4- 126369 (JP, A) JP-A-4-332478 (JP, A) JP-A-5-82147 (JP, A) JP-A-6-84538 (JP, A) JP-A-6-140069 (JP, A) JP-A-8-124590 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 8/06 H01M 8/04

Claims (10)

(57) [Claims] 1. A fuel cell that generates electric energy and heat energy by reacting hydrogen obtained by reforming raw fuel gas with a reformer and oxygen in the air, and a reformer of the fuel cell. A condensed water recovery unit that recovers condensed water from the reformer combustion exhaust gas discharged from the fuel cell and the cathode exhaust gas discharged from the air electrode of the fuel cell. A direct contact steam condenser for receiving the supply of the exhaust gas composed of the exhaust gas and the air electrode exhaust gas and recovering the moisture of the exhaust gas; including a condensed water storage section below the direct contact steam condenser; The water storage unit includes a decarbonation unit that removes carbon dioxide, a dephosphorization unit that removes phosphoric acid, and a water level detection device.A circulation pump is provided in a pipe connecting the condensed water storage unit and the cooling tower. A branch valve that branches one side of the condensed water to the decarbonation means and the other side to the two-way path of the cooling tower on the side other than the condensed water reservoir with respect to the circulation pump; On the side other than the condensed water storage section, a flow control valve for branching one of the condensed water to the direct contact type steam condenser and the other to two paths of a water treatment apparatus for replenishing battery cooling water for cooling the fuel cell. Wherein the water stored in the condensed water storage section is circulated through the cooling tower with the direct contact steam condenser to recover water from the exhaust gas. Contact type condensed water recovery system. 2. The direct contact condensed water recovery system for a fuel cell according to claim 1, wherein an exhaust gas outlet is provided at an uppermost portion of the direct contact steam condenser, a water spouting port is provided at an upper portion, an exhaust gas inlet is provided at a lower portion, and the vicinity of the exhaust gas inlet. A gas cooling unit comprising a spray nozzle, a decarboxylation unit partitioned by the gas cooling unit and the first partition plate, and a dephosphorization unit partitioned by the decarbonation unit and the second partition plate. A direct contact type condensed water recovery system for a fuel cell, comprising: 3. The fuel cell direct contact condensed water recovery system according to claim 2, wherein the water spout and the spray nozzle are connected to a flow control valve by the circulating water pipe. Contact type condensed water recovery system. 4. The direct contact condensed water recovery system for a fuel cell according to claim 1, 2 or 3, further comprising a semicircular shelf with perforations inside the direct contact steam condenser; A direct contact condensed water recovery system for a fuel cell, wherein the circular shelves are installed at equal intervals in the vertical direction while facing each other. 5. The direct contact condensed water recovery system for a fuel cell according to claim 4, wherein the semicircular shelf with holes has an opening ratio of 15 to 30%, and the number of holes per 1 m ^{2 of} the shelf is 3,200. Or 4000
A direct contact type condensed water recovery system for a fuel cell, characterized in that the number of holes is 3 to 7 mm, and the number of shelf plates per 1 m of the height of the gas cooling unit is 6 to 14. 6. The direct-contact condensed water recovery system for a fuel cell according to claim 1, 2, 3, 4, or 5, wherein the decarboxylation means is provided with a nozzle with a jet pump having an air intake for taking in external air. A direct contact type condensed water recovery system for a fuel cell, wherein the nozzle is provided on a lower side surface of the condensed water storage part in a direction along the side surface. 7. The direct contact condensed water recovery system for a fuel cell according to claim 1, 2, 3, 4, 5, or 6, wherein the dephosphorizing means has a highly water-permeable retainer and a water reservoir sandwiching the retainer. A pair of two metal meshes having a height from the bottom to the surface of the water are divided by a third partition plate made of a metal mesh sandwiching a plurality of pairs of the retainers, and the metal mesh is a DC power supply. A direct contact condensed water recovery system for a fuel cell, wherein the condensed water recovery system is electrically connected to each other via a fluid reservoir and electrically insulated from the condensed water reservoir. 8. The direct-contact condensed water recovery system for a fuel cell according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the flow control valve is electrically connected to the water level detection device, When the water level of the condensed water storage unit rises, a flow control valve is opened and the water is sent to the fuel cell water treatment device and reused as replenishing water for battery cooling water for cooling the fuel cell. Type condensed water recovery system. 9. The fuel cell exhaust gas is guided to a lower portion, and the exhaust gas is cooled by direct contact with gas cooling water sprinkled from the upper portion and the vicinity of the fuel cell exhaust gas inlet, so that condensed water can be recovered. And direct contact steam condenser. 10. A internally with a combination of a plurality of stages of perforated with semicircular shelves vertical structure, said to porous with semicircular shelves is not an aperture ratio 15 was 30%, the number of holes per shelf board 1 m ² Is 3200 to 4000 and the hole diameter is 3 to 7 mm
10. The direct contact steam condenser according to claim 9, wherein the number of shelves per meter of gas cooling unit height is 6 to 14.