JPH05347159A - Water treatment system in fuel cell power generation plant - Google Patents

Abstract

PURPOSE:To utilize much heat without ion exchange resin treatment and to eliminate generation of pollusion, by applying heat-exchange to recycled water with generated remaining heat so that it may make re-condensation through vaporization in a cell power generation plant. CONSTITUTION:A point of this water treatment system different from that of a conventional plant is that a means to refine recycled water and a secondary hydrogen are prepared. Concretely, water recycled by means of an exhaust gas treatment system 500 is sent to an evaporating refiner (h) to be vaporized with heat generated by means of a fuel cell body A instead of an ion exchange resin and at the same time to be re-condensed by means of cooling water of a secondary hydrogen 200 to make pure water. Water refined by means of re-condensation is used for cooling the body A and/or mixed with raw fuel to be used for reforming or denaturation. By these process, as ion exchange resin is not used as a refining means for recycled water in the secondary hydrogen 200 to cool the first hydrogen 100, its temperature is allowed to high level and a cooling tower is not necessary for the secondary hydrogen 200, and it is possible to recycle much energy in exchanging area after cooling the first hydrogen 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first water system for obtaining raw water for reforming raw fuel and cooling water for a fuel cell main body, and energy obtained by heat exchange from the first water system and exhaust gas system. The present invention relates to a water treatment system in a fuel cell power plant having a second water system provided with equipment to be used. Further, the present invention provides a third system which is a separate system other than the first water system and the second water system in the fuel cell power plant.
The water system can be used.

[0002]

2. Description of the Related Art It is known to collect and reuse water in a fuel cell system, for example, in Japanese Unexamined Patent Publication Nos. 2-169089 and 3-77278. In the fuel cell in the above-mentioned conventional example, the water recovered from the fuel gas system and / or the oxidant gas system is
After sufficiently cooling to a heat resistant temperature of the ion exchange resin, for example, 45 ° C. or lower, purification treatment is performed with the ion exchange resin. In the purification process of the recovered water by the ion exchange resin, the deoxidation process is performed while removing the kaothin. Further, anion and cations and organic substances are removed by performing purification treatment with an ion exchange resin again. The water treated by the ion exchange resin is reused as reforming water for raw fuel and cooling water for cooling the heat of chemical reaction of the fuel cell body.

FIG. 2 is a schematic explanatory view of a water treatment system in a conventional fuel cell power plant. Figure 2
In the fuel cell power plant, the fuel cell main body A
And a first water system 100 for cooling the fuel cell main body A and supplying steam for reforming raw fuel, and a second water system 200 for cooling the first water system 100 and having a facility for utilizing surplus heat. A fuel system 300 that reforms the raw fuel into fuel for the fuel cell body, an air system 400 that causes a cell reaction with the reformed fuel, and the fuel system 3
00 and an air system 400 to an exhaust gas treatment system 500. Although not shown in the figure, the fuel cell power plant is provided with a quadrature conversion device for converting direct current power generated by a chemical reaction between hydrogen and oxygen in the fuel cell body A into alternating current power, and a fuel cell power plant safely and safely. An operation control device for operating efficiently is provided.

The fuel cell body A constituting the fuel cell cools the anode A1 through which the hydrogen-rich mixed gas obtained by reforming the raw fuel passes, the cathode A2 through which air passes, and the heat of chemical reaction between hydrogen and oxygen. Cooling water passage A3 and anode A
1 and an electrolyte (not shown) provided between the cathode A2. The fuel system 300 includes a pipeline 1 for supplying raw fuel, a pipeline 2 for supplying steam for reforming raw fuel, a reforming facility B for reforming raw fuel by supplying raw fuel and steam, In the pipeline 3 for supplying the fuel reformed by the reforming facility B to the fuel cell main body A, in the fuel cell main body A, the excess hydrogen gas after the cell reaction and unreacted raw fuel are burned to carry out the reforming reaction. In order to serve as a heating source for the reforming equipment B, the pipeline 4 is again supplied to the reforming equipment B, and the pipeline 8 is supplied with auxiliary combustion air. The air system 400 includes a pipeline 6 that supplies air to the fuel cell main body A and a pipeline 7 that collects water and the like after the cell reaction. Also,
In the reforming facility B, combustion exhaust gas is released from the pipeline 5.

The raw fuel supplied from the pipeline 1 is
After being mixed with steam supplied from the pipeline 2 and heated in the heat exchanger B1 by the reforming facility B, it is reformed and metamorphosed to be mixed gas of hydrogen, carbon dioxide, carbon monoxide, steam and the like. Become. Then, these mixed gases pass through the heat exchanger B1 and are supplied from the pipeline 3 to the anode A1 of the fuel cell main body A. In the fuel cell main body A, the mixed gas supplied by the pipeline 3 reacts with the air supplied from the air system 400 through the pipeline 6 to be converted into electric power. Unreacted fuel that has not been reacted in the fuel cell main body A and the reforming equipment B, for example, hydrogen or methane as a raw fuel is burned by the air in the pipeline 8 in the reforming equipment B and discharged from the pipeline 5. To be done. From the cathode A2 of the fuel cell main body A, the water produced by the cell reaction is discharged into the cathode exhaust gas and recovered via the pipeline 7.

The first water system 100 includes a cooling water passage A3 for cooling the fuel cell main body A, a steam separator b for separating hot water into steam and hot water, and a circulation pump c for circulating the first water system 100. , A heat exchanger d for lowering the temperature of hot water, and water purifiers g, g'comprising ion exchange resins for purifying the recovered water
And a water supply pump e for supplying the purified water purified by the water purifiers g, g'to the steam separator b, and pipelines 11, 12, 13, 24, 25 connecting them. There is. A second water system 200 that cools the first water system 100 and an exhaust gas treatment system 500 described below includes exhaust heat recovery heat exchangers a and d, an exhaust heat utilization facility C, and a second heat recovery facility.
It comprises a cold water tower D for cooling the water system 200, a circulation pump f, and pipelines 35, 36, 37, 38 connecting these.

The exhaust gas treatment system 500 includes a pipeline 5 for collecting combustion exhaust gas discharged from the reforming facility B, a pipeline 7 for collecting exhaust gas containing water produced by the cell reaction of the fuel cell main body A, and a pipe. It is composed of a pipeline 9 where the lines 5 and 7 join, and an exhaust heat recovery heat exchanger a for cooling these exhaust gases. The excess waste gas cooled by the exhaust heat recovery heat exchanger a is released to release the pressure from the pipeline 10, and the excess water is released from the pipeline 26. When the recovered water condensed and separated by the exhaust heat recovery heat exchanger a passes from the pipeline 24 to the water purifier g using the ion exchange resin, impurities contained in the recovered water are adsorbed on the resin to be purified. .. The water purifier g is provided with a spare water purifier g ′ because the adsorption capacity of the resin deteriorates due to ion exchange adsorption and needs to be replaced. The water obtained by the exhaust heat recovery heat exchanger a is always set to 40 ° C. or lower in consideration of the heat resistance limit of the ion exchange resin. After that, the recovered water purified by the water purifier is supplied from the pipeline 25 to the steam separator b by the water supply pump e and used as cooling water for the fuel cell main body A and / or reaction water for reforming raw fuel. To be done.

In the exhaust heat recovery heat exchanger a, the water that has cooled the exhaust gas passes through the pipeline 36 and cools the water for cooling the fuel cell main body A by the heat exchanger d. The heat obtained by the heat exchanger d is supplied to the waste heat utilization equipment C from the pipeline 37. As the waste heat utilization facility C, for example, an absorption type cold water producing device is used. As an example of the fuel cell, methane gas as a raw fuel is 48.5 NM ³ / hour,
When steam is supplied at 160 kg / hr and air is supplied at 508 NM ³ / hr, DC power of 1000 A and 200 V is usually generated. In the absorption-type cold water producing device in the fuel cell of such a scale, cold water at 7 ° C. is produced at 71,000 kcal / hour, and the heat medium water flowing through the first water system pipeline 38 is set to 80 ° C. However, even at 80 ° C., the ion-exchange resin is so high that it deteriorates. Therefore, in order to protect the ion-exchange resin, the pipeline 38 further radiates heat to the atmosphere through the cold water tower D to release the heat medium. The water temperature is lowered to 40 ° C.

[0009]

As described above, the recovered water produced by the cell reaction or the like is used in the fuel cell power plant in order to prevent deterioration of the ion exchange resin due to the high temperature treatment of the ion exchange resin. The lowest temperature is required, for example 40 ° C. Therefore, the recovered water to be treated with the ion exchange resin has been cooled by providing a cold water tower or by newly introducing cooling water of a low temperature from the outside. In addition, the ion-exchange resin not only requires low-temperature raw water for treatment, but also consumes the ion-exchange capacity of the resin by adsorbing cations and anions contained in the recovered water. Disappears. In order to recover the water treatment capacity of the ion exchange resin, it was necessary to replace the ion exchange resin, reactivate it with an acid or alkali, or reactivate it with an electric current. Therefore, the fuel cell power generation plant having the ion exchange resin treatment is expensive because the above-mentioned regeneration work and regeneration cost are increased and a spare ion exchange resin and equipment such as a cooling tower are required.

Further, cooling water of the fuel cell power generation body or water for obtaining steam for reaction may have to be introduced from a system other than the fuel cell system such as tap water. In such a case, the ion exchange resin has a problem that chlorine, calcium, or the like is adsorbed and the life is shortened.

The present invention is intended to solve the above problems, and provides an aqueous treatment system in a fuel cell power plant equipped with an inexpensive means for purifying recovered water without performing ion exchange resin treatment. The purpose is to Also,
It is an object of the present invention to provide a water treatment system in a fuel cell power plant that can utilize a large amount of heat when purified recovered water. A further object of the present invention is to provide a water treatment system in a fuel cell power plant that can introduce water from a water system other than the fuel cell power plant.

[0012]

(First Invention) A water treatment system in a fuel cell power plant according to the present invention comprises a fuel cell main body (A in FIG. 1) and raw fuel as fuel of the fuel cell main body (A). And a fuel system (300 in FIG. 1) that is supplied to the fuel cell body (A).
0) for treating the combustion exhaust gas and the cathode exhaust gas of the fuel cell (500 in FIG. 1), and a first water system (FIG. 1 for generating water for cooling the fuel cell body (A) and reaction steam). 100) and the first water system (10
0) and a second water system (200 in FIG. 1) for cooling,
In the first water system (100), the exhaust gas treatment system (500)
The water recovered by is heat-exchanged with the surplus heat generated in the fuel cell power plant, and is vaporized and re-condensed to be purified.

(Second invention) The water treatment system in the fuel cell power plant according to the present invention uses the energy recovered from the first water system (100) by the heat exchanger (h ', d in FIG. 1) as a drive source. A second water system (200) having an operating cold heat generating facility.

(Third Invention) A water treatment system in a fuel cell power plant of the present invention is the second water treatment system (20).
It is characterized in that the energy obtained in 0) is used as the heat source of other heat utilization equipment.

(Fourth Invention) In a water treatment system for a fuel cell power plant according to the present invention, the water purified by the first water system (100) is used as cooling water for the fuel cell body (A) and / or fuel reforming. It is characterized by being used as raw material water.

(Fifth invention) The recovered water of the water treatment system in the fuel cell power plant according to the present invention is characterized in that it is re-condensed by using the cooling water at 70 ° C. or higher after operating the cold heat generating facility. To do.

(Sixth Invention) In the water treatment system for a fuel cell power plant of the present invention, the water vaporized and recondensed is introduced from a third water system other than the fuel cell system.

[0018]

[Operation] (First invention) Water produced by the fuel cell body or the like is collected by the exhaust gas treatment system. The recovered water is vaporized by the excess heat generated in the fuel cell power plant in the first water system. The vaporized water vapor is recondensed by the cooling water of the second water system. The purified water recondensed with the cooling water of the second water system serves as cooling water for the fuel cell main body and is supplied to the reforming facility as reaction steam. Further, the surplus heat is supplied as steam or hot water as another heat utilization heat medium. Since the water used for cooling the fuel cell main body and steam is obtained by vaporization and recondensation, not only is there no need to replace the ion-exchange resin, regeneration treatment, and the like, and the equipment is inexpensive.
Further, since the ion exchange resin is not used, the temperature of the water in the second water system can be set high, so that equipment such as a cooling tower is unnecessary.

(Second Invention) The second water system is provided with cold heat generating equipment which operates by using the energy recovered from the first water system by the heat exchanger as a drive source. Since the ion exchange resin is not used for the purification of water in the first water system, the temperature of water in the second water system can be set high.
Therefore, the waste heat utilization equipment can use a lot of hot water in a high temperature range.

(Third invention) Since the temperature of the second water system is set high, a large amount of hot water in a high temperature range after heat exchange with the first water system is transferred to other heat utilization equipment. Available.

(Fourth Invention) In the first water system, the purified water re-condensed after being vaporized becomes cooling water for cooling the fuel cell body. In the purified water of the first water system, for example, steam is taken out by a steam separator.
It is supplied to the reforming equipment together with the raw fuel.

(Fifth Invention) The water of the second water system, which has recovered heat energy from the first water system by heat exchange, is higher than the temperature used for the ion exchange resin at 70 ° C. or higher after the cold heat generating equipment is operated. It is recondensed with cooling water. Therefore, the second water system can circulate high-temperature cooling water, and high-temperature energy can be used without lowering the temperature by the cooling tower.

(Sixth Invention) Since the water for cooling the fuel cell main body and the steam used for the reforming reaction are condensed after being vaporized, it is not always necessary to use the water in the fuel cell system. For example, tap water can be introduced, this water can be vaporized, and then condensed to obtain purified water. And this system can obtain water of desired purity.

[0024]

EXAMPLE An example of the present invention will be described with reference to FIG. FIG. 1 is a schematic explanatory diagram of a water treatment system in a fuel cell power plant according to an embodiment of the present invention.
In FIG. 1, the difference from the conventional example in FIG. 2 lies in the means for purifying the recovered water and the second water system. In FIG. 1, the fuel cell power generation plant includes a fuel cell main body A, a first water system 100 that cools the fuel cell main body A, and supplies steam that reforms raw fuel, and the first water system 100.
Second, which has equipment for cooling excess heat and utilizing excess heat
A water system 200, a fuel system 300 that reforms the raw fuel into the fuel of the fuel cell main body A, an air system 400 that causes a cell reaction with the reformed fuel, and an exhaust from the fuel system 300 and the air system 400. And an exhaust gas treatment system 500 for treating the gas. Although not shown in the figure, the fuel cell power plant is provided with a quadrature conversion device for converting direct current power generated by a chemical reaction between hydrogen and oxygen in the fuel cell body A into alternating current power, and a fuel cell power plant safely and safely. An operation control device for operating efficiently is provided.

In this embodiment, the first water system 100 includes a cooling water passage A3 for the fuel cell main body A, a heat exchanger h "for vaporizing the recovered water, a heat exchanger h'for recondensing thereafter, and the cooling water passage. A3 and a vapor-water separator b for separating the cooling water from the vaporizer / refiner h, a circulation pump c, a water supply pump e, and a closed circuit composed of a pipeline 11-12-13-23-13-11, and a pipe. There is a system of vaporization-recondensation-pipeline 22 of recovered water from the line 21.

The second water system 200 includes an exhaust heat recovery heat exchanger a, a heat exchanger h'of a vaporization and refiner h, and a first water system 10.
It is composed of a heat exchanger d for cooling 0 and a closed circuit of the exhaust heat utilization equipment C, and has pipelines 31, 32, 33, 34.
Connected by.

That is, the water recovered by the exhaust gas treatment system 500 is vaporized by the heat generated by the fuel cell main body A instead of the ion exchange resin in the vaporizer / refiner h, and by the cooling water of the second water system 200. It is re-condensed and becomes pure water. The water purified by recondensation is
The fuel cell body A is cooled and / or mixed with raw fuel and used for reforming or transformation. The second water system 200 that cools the first water system 100 does not use an ion exchange resin in the means for purifying the recovered water, and thus can be at a high temperature. Therefore, the second water system 200 does not need to provide a cooling tower, for example, and can reuse a large amount of energy in the high temperature range after cooling the first water system 100.

The evaporation operation by the vaporizing and refining device h may be a distillation operation if necessary. In the vaporizer / refiner h, the water of the heat medium of the second water system 200 used for recondensation does not use an ion exchange resin, and therefore, for example, 125
C. to 85.degree. C. can be relatively high. Also,
The recovered heat obtained by cooling the first water system 100 is used as a heat source for hot water supply or an absorption chiller. The higher the temperature of the heat source, the more effectively the absorption type water cooler can be used, and the lower the temperature is, the more the utilization efficiency is drastically decreased. In the vaporizer / refiner h, the evaporator for evaporating the recovered water has a mirror-finished surface for heat exchange heat transfer, which enables stable treatment without adhesion of scale and does not require special regeneration treatment. The method for evaporating the recovered water may be an ordinary one-step evaporation method, but if a multiple evaporator method is adopted, it is possible to reduce the amount of heat required for evaporation. Furthermore, pressurizing the vaporized water vapor,
It may be used as a part of a heat source for evaporating the recovered water.

Next, a specific example in one embodiment of the present invention will be described. Methane gas, which is the raw fuel of the fuel cell, is supplied from pipeline 1 at 48.5 NM ³ / hour. The water vapor mixed with the raw fuel is from pipeline 2 to 1
It is supplied at 60 kg / hour. The mixed gas composed of the raw fuel and steam is heat-exchanged in the reforming facility B to raise the temperature,
Further, it is heated by a heating burner (not shown). In the reforming facility B, the mixed gas is used as a fuel gas for a fuel cell mainly containing hydrogen and carbon dioxide on a reforming catalyst mainly containing nickel and a shift catalyst mainly containing iron and copper. It is modified and transformed. The fuel gas reformed and metamorphosed for the fuel cell is supplied from the pipeline 3 to the anode A1 of the fuel cell main body A.

The oxidant gas in the fuel cell body A is 5
Air of 08 NM ³ / hr is supplied from the pipeline 6 to the cathode A2 of the fuel cell main body A. In the fuel cell main body A, the reaction proceeds through an electrolyte (not shown) interposed between the anode A1 and the cathode A2, and as a result, DC power of 1000 A and 200 V is generated. The reformed gas supplied to the anode A1 consumes hydrogen due to a cell reaction, and then excess unreacted methane gas, hydrogen gas, or carbon dioxide gas is supplied from the pipeline 4 to the heating burner (not shown) of the reforming facility B. Sent to. Further, these surplus gases are burned by obtaining auxiliary combustion air from the pipeline 8. The combustion exhaust gas after being burned by the reforming facility B is discharged from the pipeline 5 after preheating the auxiliary combustion air to recover heat. The air supplied from the pipeline 6 to the cathode A2 of the fuel cell main body A consumes oxygen by the cell reaction between hydrogen and oxygen, and steam is generated. Then, this steam is discharged from the pipeline 7 as cathode exhaust gas, and is recovered by the exhaust heat recovery heat exchanger a together with the combustion product water and excess steam.

The exhaust gas discharged from the pipeline 7 is
It joins the exhaust gas discharged from the pipeline 5 and is sent from the pipeline 9 to the exhaust heat recovery heat exchanger a. The exhaust heat recovery heat exchanger a is held at 7ata and cooled to 96 ° C. By cooling the exhaust heat recovery heat exchanger a, excess steam supplied in the reforming and shift reaction, steam generated by the cell reaction, and steam generated by the combustion reaction in the reforming facility B are condensed and separated. Then, it is recovered from the pipeline 21. In the exhaust heat recovery heat exchanger a, exhaust gases other than water vapor are released to release the pipeline 10
Open to the atmosphere.

In the exhaust heat recovery heat exchanger a, the recovered water condensed and separated is introduced from the pipeline 21 into the vaporization and refiner h. The amount of heat generated by the fuel cell main body A is recovered from the pipeline 11 by the cooling water circulating in the cooling water passage A3. The cooling water heated by the fuel cell body A is supplied from the pipeline 12 to the steam separator b. In the steam separator b, it becomes steam and the pipeline 2
To the reforming equipment B, and the rest is separated from the pipeline 13 into the first water system 100 as hot water. The amount of heat that the hot water separated in the pipeline 13 has is
Used for evaporating the recovered water introduced into the vaporizing and purifying device h through the evaporative heat conducting surface h ″ of the vaporizing and purifying device h. The evaporative heat conducting surface h ″ of the vaporizing and purifying device h has a mirror finish of 12.5 μm or less. There is. The recovered water that has been heated and vaporized on the evaporation heat transfer surface h ″ of the vaporization and refining device h is supplied with the heat medium water from the pipeline 32 of the second water system 200 and passes through the condensation heat transfer surface h ′. Then, it is cooled to 100 ° C. and re-condensed.The re-condensed purified and recovered water is sent from the pipeline 22 to the steam separator b by the feed water pump e, and the fuel cell main body A
Used as cooling water and steam for reforming reaction.

A vaporizer / refiner h for cooling and recondensing the recovered water.
The water of the heat medium from the pipeline 32 of the second water system 200 introduced into the pipeline is received by the vaporizing and refining device h, and the pipeline 3
3 through the heat exchanger d, the water in the pipeline 33 is
By controlling the temperature of the pipeline 11 to 172 ° C., the heat medium water itself becomes 100 ° C. The heat medium water supplied from the pipeline 33 becomes 100 ° C. and is supplied from the pipeline 34 to the waste heat utilization facility C. Waste heat utilization equipment C
There is an absorption type cold water producing device. The absorption chilled water maker produces 234,000 kcal / hr of cold water at 7 ° C. At this time, the heat medium water releases the amount of heat to 80 ° C., and is again sent to the exhaust heat recovery heat exchanger a by the circulation pump f and circulated. The flow rate of the circulation pump f at this time is 117
00 kg / hour

In the conventional example, the cooling water of the pipeline 35 at the inlet of the exhaust heat recovery heat exchanger a is 4000 kg.
40 ° C./hour, and the cooling water of the pipeline 34 at the outlet of the heat exchanger d was 100 ° C. In this embodiment, the cooling water of the pipeline 35 at the inlet of the exhaust heat recovery heat exchanger a is 80 ° C. at 11720 kg / hour, and the cooling water of the pipeline 34 at the outlet of the heat exchanger d is 1
It was 00 ° C. In this embodiment, since no ion exchange resin is used, 80 ° C. is used for heat exchange of the exhaust heat recovery heat exchanger a.
The heat medium can be used. In addition, in this embodiment, the amount of water in the heat medium is three times that of the conventional example. Therefore, the amount of heat that can be used in the waste heat utilization facility C is three times that of the conventional example.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. And
Various design changes can be made without departing from the invention as set forth in the claims. Needless to say, the fuel cell power plant can be applied to other types such as a phosphoric acid fuel cell power plant. Further, the water treatment system of this example is composed of a first water system and a second water system, but since an ion exchange resin is not used as in the conventional case, a third water system other than the first and second water systems is used. For example, tap water or the like can be introduced. Even if chlorine, calcium, etc. are mixed, the water of the third water system can be purified by vaporizing and condensing, just as in the case of the first water system of the fuel cell power plant.

[0036]

As described above, according to the present invention, in the fuel cell power plant, the recovered water is purified by being heat-exchanged with the generated excess heat, vaporized and recondensed. Therefore, in the water treatment system in the fuel cell power plant of the present invention, since the ion exchange resin is not used, it is not necessary to use low-temperature cooling water that matches the cooling of the recovered water with the ion exchange resin, and the ion exchange resin is regenerated. It is unnecessary to carry out the process for carrying out the process, the chemicals required at that time, or the electric power for regeneration. Further, since there is no outflow of waste water from the chemicals used when regenerating the ion exchange resin, no pollution will occur.

According to the present invention, if the heat of recondensation is recovered in the water of the heat medium, almost all of the recovered heat amount can be used as the drive source of the cold heat generating equipment, and the combined heat and power equipment which is one of the purposes of the fuel cell. As a result, it is particularly effective in producing cold water for cooling of buildings, which is in high demand. Furthermore, it is no longer necessary to regenerate or replace the ion-exchange resin, which was conventionally required for the treatment of battery recovery water, and the maintenance of the equipment has been simplified. As described above, since the water treatment system in the fuel cell power generation plant of the present invention does not use the ion exchange resin, the recovered water remains at a relatively high temperature and is evaporated by using the exhaust heat of the fuel cell power generation system. Treatment or distillation treatment is performed. That is, in the evaporation process or the distillation process of the recovered water, the removal process of the light component and the weight component from the recovered water is simultaneously performed. Furthermore, a large amount of high-temperature hot water with high utility value can be recovered and reused. Further, according to the present invention, since the cooling water for the fuel cell main body and / or the water for steam is vaporized and condensed, the above water can be introduced into a water system other than the fuel cell power generation system.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a water treatment system in a fuel cell power plant according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of a water treatment system in a fuel cell power plant according to a conventional example.

[Explanation of symbols]

 A ... Fuel cell main body B ... Reforming equipment C ... Exhaust heat utilization equipment a ... Exhaust heat recovery heat exchanger b ... Steam / water separator c ... Circulation pump d ... Heat exchanger e ... Water supply pump f ... Circulation pump g ... Water purifier h ... Vaporizer / refiner h '... Heat exchanger (condensation heat transfer surface) h "... Heat exchange Container (evaporation heat transfer surface) 100 ... First water system 200 ... Second water system 300 ... Fuel system 400 ... Air system 500 ... Exhaust gas treatment system

Claims (6)

[Claims] 1. A fuel cell main body, a fuel system that reforms raw fuel into fuel for the fuel cell main body and supplies the fuel to the fuel cell main body together with air, an exhaust gas treatment system in the fuel system, and the fuel cell main body. A first water system for producing water and steam for cooling water, and a second water system for cooling the first water system; and a second water system for cooling the first water system, wherein the first water system collects by an exhaust gas treatment system. A water-based treatment system in a fuel cell power plant, characterized in that the purified water is purified by exchanging heat with excess heat generated in the fuel cell power plant, vaporizing and recondensing. 2. A second water system having a cold heat generation facility that operates by using energy recovered by a heat exchanger from the first water system as a drive source.
A water treatment system in the fuel cell power plant described. 3. The water treatment system in a fuel cell power plant according to claim 1, wherein the energy obtained by the second water system is used as a heat source of another heat utilization facility. 4. The water system treatment in a fuel cell power plant according to claim 1, wherein the water purified by the first water system is used as cooling water for the fuel cell body and / or raw water for fuel reforming. system. 5. The water of the second water system, which has recovered energy from the first water system by heat exchange, is re-condensed by using cooling water of 70 ° C. or higher after operating the cold heat generating facility. The water treatment system in the fuel cell power plant according to claim 1. 6. The water vaporized and recondensed is introduced from a third water system other than the fuel cell system.
A water treatment system in a fuel cell power plant according to claim 5.