JP2000048843A - Fuel cell power facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a capacity factor of exhaust heat in a fuel cell power facility. SOLUTION: In the fuel cell power facility, having a fuel cell power generating unit 3 for generating electricity by feeding fuel gas and oxygen contained gas and making hydrogen in fuel gas and oxygen in oxygen contained gas to electrochemically react with each other, a water-cooling means 7 for cooling the fuel cell power generating unit 3 by cooling water to be fed, an exhaust gas and exhaust heat recovery means 26 for recovering exhaust heat from exhaust gas discharged from the plant by condensing steam and recovering it as cooling water, and a cooling water exhaust heat recovering means A for recovering the exhausted heat having the temperature higher than that of recovered exhausted heat of the exhaust gas exhaust heat recovering means 26, a heat output means B for obtaining output of heat having a temperature higher than that of the recovered exhaust heat of the exhaust gas exhaust heat recovering means 26 by making use of the recovered exhaust heat of the cooling water exhaust heat recovering means A and recovered exhaust heat of the exhaust gas and exhaust heat recovering means 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generation unit which is supplied with a fuel gas and an oxygen-containing gas, and performs an electrochemical reaction between hydrogen in the fuel gas and oxygen in the oxygen-containing gas to generate electric power. Water cooling means for water-cooling the fuel cell power generation unit with cooling water, exhaust gas heat recovery means for collecting exhaust heat while condensing water vapor from exhaust gas discharged from the facility and collecting the water as the cooling water, The present invention relates to a fuel cell power generation facility provided with cooling water exhaust heat recovery means for recovering exhaust heat higher than the recovery exhaust heat of the exhaust gas exhaust heat recovery means from the cooling water discharged from the water cooling means.

[0002]

2. Description of the Related Art In such a fuel cell power generation system, conventionally, the heat output from the cooling water exhaust heat recovery means and the heat output from the exhaust gas exhaust heat recovery means are output to the outside as they are and used. Was like that. For example, from the exhaust gas exhaust heat recovery means, hot water is obtained as the heat output, and from the cooling water exhaust heat recovery means, as the heat output, hot water higher than the hot water obtained from the exhaust gas exhaust heat recovery means is obtained. The hot water obtained from each of the exhaust gas heat recovery means and the cooling water heat recovery means was used.

[0003]

In order to condense the water vapor in the exhaust gas, it is necessary to cool the exhaust gas to, for example, about 50 ° C. Reduces the temperature of the heat output (e.g., below 60 ° C). However, conventionally, since the heat output output from the exhaust gas exhaust heat recovery means is used as it is,
Even if you use that heat output, because its temperature is low,
For example, it is difficult to use it for hot water supply and its use is limited,
It could not be used efficiently. Therefore, there is a problem that the utilization rate of exhaust heat as the whole fuel cell power generation equipment is low.

The present invention has been made in view of such circumstances, and an object of the present invention is to improve the utilization rate of exhaust heat as a whole of a fuel cell power generation facility.

[0005]

According to the first aspect of the present invention, the heat output means uses the recovered waste heat of the cooling water waste heat recovery means and the recovered waste heat of the exhaust gas waste heat recovery means. As a result, a higher heat output than the exhaust heat recovered by the exhaust gas exhaust heat recovery means can be obtained. Therefore, since the heat output at a higher temperature than the exhaust heat recovered by the exhaust gas exhaust heat recovery means can be used, the application of the heat output is widened, and the utilization rate of the exhaust heat as the whole fuel cell power generation equipment is improved. Is now available.

According to a second aspect of the present invention, in the evaporator, the refrigerant liquid evaporates using the recovered exhaust heat of the exhaust gas exhaust heat recovery means as a heat source, and the refrigerant vapor is supplied to the absorber.
In the absorber, it is absorbed by the absorbing liquid. The dilute absorption liquid that has absorbed the refrigerant vapor in the absorber is supplied to a regenerator, and in the regenerator, the dilute absorption liquid is heated using the recovered waste heat of the cooling water waste heat recovery means as a heat source to generate refrigerant vapor. I do. Refrigerant vapor generated in the regenerator is supplied to the condenser,
In the condenser, the refrigerant vapor is condensed into a refrigerant liquid, and the refrigerant liquid is supplied to the evaporator. Then, heat generated in the absorber (sensible heat, absorption heat, etc. of the absorbing liquid) or heat generated in the condenser (sensible heat, condensation heat, etc. of refrigerant vapor) is recovered and output. In other words, using the absorption cycle of the absorption heat pump, the high-temperature recovered exhaust heat of the cooling water exhaust heat recovery unit is used as driving energy, and heat is drawn from the low-temperature recovered exhaust heat of the exhaust gas exhaust heat recovery unit, and the exhaust gas exhaust heat recovery unit is used. The heat output is higher than the recovered waste heat. Incidentally, the heat output means heat-exchanges the high-temperature recovered exhaust heat of the cooling water exhaust heat recovery means with the low-temperature recovered exhaust heat of the exhaust gas exhaust heat recovery means to raise the recovered exhaust heat of the exhaust gas exhaust heat recovery means. It can be constituted by a heat exchanger that outputs the output.
However, in the case of using this heat exchanger, the heat loss is large, so that the utilization rate of exhaust heat is smaller than in the case of using an absorption heat pump. Therefore, according to the characteristic configuration of the second aspect, in implementing the present invention, it is possible to provide a specific configuration having a large effect in improving the utilization rate of exhaust heat.

According to a third aspect of the present invention, the cooling water exhaust heat recovery means includes a heat exchanger for heating the fluid to be heated by using the cooling water discharged from the cooling means as the heating fluid. The fluid to be heated heated by the heat exchanger flows through the regenerator as a heat source.
Therefore, since the cooling water does not decrease by collecting the exhaust heat from the cooling water by the cooling water exhaust heat recovery means, a configuration for newly supplying the cooling water is added in practicing the present invention. It is not necessary to carry out, and the implementation cost of the present invention can be reduced. Further, it is possible to avoid a problem that the supply amount of the cooling water has to be increased, so that an increase in running cost can be avoided.

According to a fourth aspect of the present invention, the cooling water exhaust heat recovery means is provided with a steam-water separation device for separating steam from the cooling water discharged from the cooling means. The steam separated by the device is passed through a regenerator as a heat source, and condensed water obtained by condensing the steam is recovered as cooling water. Therefore, heat can be pumped using high-temperature steam as driving energy, so that a higher-temperature heat output can be obtained.
Further, since the condensed water in which the water vapor is condensed is collected as the cooling water, the present invention can be implemented while avoiding an increase in running costs due to an increase in the amount of cooling water supplied.

[0009] According to the characteristic configuration of claim 5, 60
A heat output of more than ° C can be obtained. Therefore, 60 °
Since the heat output of C or more can be effectively used for a hot water supply system and the like, and the use thereof is widened, the utilization rate of exhaust heat can be further improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a phosphoric acid type fuel cell power generation facility will be described below with reference to FIG. The fuel cell power generation unit 3 includes a fuel cell power generation unit 3 that generates an electrochemical reaction between hydrogen in fuel gas supplied through the fuel gas passage 1 and oxygen in reaction air supplied through the air passage 2 to generate power. A water-cooling unit 7 (corresponding to a water-cooling unit) for water-cooling the fuel cell power generation unit 3 with the supplied cooling water, and cooling for condensing water vapor from exhaust gas discharged from the fuel cell power generation unit 3 and supplying the water-cooled unit 7 An exhaust gas heat exchanger 26 (corresponding to an exhaust gas exhaust heat recovery unit) that recovers exhaust heat while recovering as water, and cooling water discharged from the water cooling unit 7 recovers the exhaust heat from the exhaust gas heat exchanger 26. Also, cooling water exhaust heat recovery means A for recovering high-temperature exhaust heat is provided.

In the present invention, the cooling water exhaust heat recovery means A
A heat output means B is provided which obtains a higher heat output than the recovered exhaust heat of the exhaust gas heat exchanger 26 by using the recovered exhaust heat of the exhaust gas heat exchanger 26 and the recovered exhaust heat of the exhaust gas heat exchanger 26. The heat output means B includes an evaporator 51 for evaporating the refrigerant liquid, an absorber 52 for absorbing the refrigerant vapor generated by the evaporator 51 into an absorbing liquid, and a rare absorbing liquid generated by the absorber 52. Regenerator 53 for generating refrigerant vapor by heating the
3 is constituted by an absorption heat pump C provided with a condenser 54 for condensing the refrigerant vapor generated. The absorption heat pump C uses the recovered waste heat of the exhaust gas heat exchanger 26 as a heat source for evaporating the refrigerant in the evaporator 51, and uses the recovered waste heat of the cooling water waste heat recovery means A in the regenerator 53. A configuration in which the heat generated by the absorber 52 and the heat generated by the condenser 54 are recovered using the heat source for heating the absorbing liquid, and the recovered heat is output to the heat utilization unit D such as a hot water supply system. I have.

The fuel cell power generation section 3 will be described.
Although not shown, the fuel cell power generation unit 3 is configured by stacking a plurality of cells each having a fuel electrode on one surface of an electrolyte layer containing phosphoric acid and an oxygen electrode on the other surface. The fuel gas is supplied to the fuel electrode of each cell, and the reaction air is supplied to the oxygen electrode of each cell. In each cell, hydrogen and oxygen are electrochemically reacted to generate power. Further, the fuel electrode exhaust gas is discharged from the fuel electrode of each cell to the fuel electrode exhaust gas passage 4, and the oxygen electrode exhaust gas is discharged from the oxygen electrode of each cell to the oxygen electrode exhaust gas passage 5. The oxygen exhaust gas discharged from the oxygen electrode of each cell to the oxygen electrode exhaust gas passage 5 contains water vapor generated by an electrochemical reaction between hydrogen and oxygen. Hydrogen gas remains in the fuel electrode exhaust gas discharged to the fuel cell.

Further, since the electrochemical reaction between hydrogen and oxygen in each cell is an exothermic reaction, the fuel cell power generation unit 3 uses the cooling water supplied through the cooling water outgoing passage 6 to
A water cooling unit 7 for cooling the cell with water is provided. The cooling water is discharged from the water cooling section 7 to the cooling water return path 8. Then, each of the cooling water forward path 6 and the cooling water return path 8 is connected to the air / water separator 9, and a cooling water pump 10 is interposed in the cooling water outward path 6, and the cooling water is supplied from the air / water separator 9 to a water cooling unit. The cooling water is supplied from the water cooling unit 7 to the steam-water separator 9, and the steam-water is separated from the cooling water in the steam-water separator 9.

Next, a configuration for supplying fuel gas to the fuel cell power generation section 3 will be described. A hydrocarbon-based raw fuel gas such as natural gas is supplied to a desulfurization device 12 through a raw fuel gas passage 11 to be desulfurized, and the desulfurized raw fuel gas is sent to an ejector 14 through a gas passage 13, where the fuel is supplied to the ejector 14. The gas is mixed with the desulfurized raw fuel gas and the steam sent from the steam separator 9 through the steam passage 15 and sent to the reformer 17 through the gas passage 16. In the reformer 17, a reforming reaction is performed between the raw fuel gas and the steam to generate a reformed gas containing hydrogen gas and carbon monoxide gas,
The reformed gas is sent to a shift converter 19 through a gas passage 18. In the shift converter 19, a shift reaction between the carbon monoxide gas and the water vapor in the reformed gas is performed to generate a shift gas containing hydrogen gas and carbon dioxide gas. To the fuel cell power generation unit 3 through

An air supply blower 20 is connected to the air passage 2 to supply reaction air to the fuel cell power generation unit 3 through the air passage 2.

Since the reforming reaction in the reforming device 17 is an endothermic reaction, the reforming device 17 is provided with a burner 21 for giving heat of reaction. The fuel electrode exhaust gas passage 4 and the air passage 2 are each connected to a burner 21, and the burner 21 burns the fuel electrode exhaust gas discharged from the fuel cell power generation unit 3. A flue gas passage 22 for guiding a flue gas containing water vapor discharged from the burner 21 is connected to the oxygen electrode exhaust gas passage 5, and the oxygen electrode exhaust gas discharged from the fuel cell power generation unit 3 by the oxygen electrode exhaust gas passage 5. And the combustion exhaust gas discharged from the burner 21 are both discharged.

Since the shift reaction in the shift unit 19 is an exothermic reaction, the shift unit 16 is provided with a water-cooling unit 23 that performs water cooling with the supplied cooling water. The cooling water forward path 6 and the cooling water return path 8 are connected to the water cooling section 23 so that the cooling water is supplied from the water cooling section 9 and the cooling water is returned from the water cooling section 23 to the steam separator 9.

In the cooling water outward path 6, the cooling water flowing through the cooling water outward path 6 is used as the heating side fluid, and the cooling water for heating the heat transporting water as the heated side fluid flowing through the heat transport circulation path 29 is used. With the heat exchanger 24 interposed, the cooling water heat exchanger 24
As a result, exhaust heat is recovered from the cooling water flowing through the cooling water outward path 6.

A circulation pump 31 is interposed in the heat transfer circulation path 29, and the heat transfer circulation path 29 is connected to a heat transfer coil 65 in the regenerator 53 so that the cooling water heat exchanger 2
The heat transfer water heated in 4 is passed through the heat transfer coil 65 of the regenerator 53 as a heat source. Accordingly, the cooling water exhaust heat recovery means A is configured to include the cooling water heat exchanger 24, and the cooling water heat exchanger 24 includes the water cooling unit 7 of the fuel cell power generation unit 3, The exhaust heat is recovered from the cooling water discharged from the 19 water cooling section 23.

A steam discharge passage 25 is connected to the gas phase of the steam / water separation device 9 so that the steam can be appropriately taken out to the outside through the steam discharge passage 25 for use.

The oxygen-electrode exhaust gas passage 5 exchanges heat between the exhaust gas containing steam (including the oxygen-electrode exhaust gas and the combustion exhaust gas) flowing therethrough and the heat transfer water flowing through the heat transfer circulation passage 30. The exhaust gas heat exchanger 26 for condensing the water vapor in the exhaust gas and recovering the exhaust heat from the exhaust gas to the heat transfer water is provided. A circulation pump 32 is interposed in the heat transfer circuit 30, and the heat transfer circuit 3
0 is connected to the heat transfer coil 66 in the evaporator 51 so that the heat transfer water heated in the exhaust gas heat exchanger 26 flows through the heat transfer coil 66 of the evaporator 51 as a heat source. is there. In the figure, reference numeral 33 denotes an exhaust gas heat exchanger 26.
This is a cooler that further cools the heat transfer water returning to.

In order to store the condensed water obtained in the exhaust gas heat exchanger 26 in a tank 27, the exhaust gas heat exchanger 26 and the tank 27 are connected by a condensed water passage 28. Further, the tank 27 and the water treatment device 34 are connected by a condensed water passage 36 provided with a pump 35, and the water treatment device 34 and the cooling water outgoing passage 6 are connected to a condensed water return passage 38 provided with a pump 37. Connected. That is, the condensed water obtained in the exhaust gas heat exchanger 26 is filtered by the water treatment device 34 to be pure water, and the pure water is returned to the cooling water outflow path 6 as cooling water.

The absorption heat pump C will be described with reference to FIG. The gas phase of the evaporator 51 and the gas phase of the absorber 52 are connected by a communication path 55, and the gas phase of the regenerator 53 and the gas phase of the condenser 54 are connected by a communication path 56. is there. The liquid reservoir of the condenser 54 and the upper part of the evaporator 51 are connected by a refrigerant liquid passage 57, and the liquid reservoir of the evaporator 51 and the refrigerant liquid dispersing tool 58 in the upper part of the evaporator 51 are connected to the refrigerant liquid pump 5.
9 are connected by a refrigerant liquid passage 60 interposed. Further, the liquid reservoir of the absorber 52 and the regenerator 53 are connected to the absorbent pump 61.
Are connected by a dilute absorption liquid passage 62 interposed therebetween, and a liquid pool part of a regenerator 53 and an absorption liquid spraying tool 63 on an upper part of the absorber 52 are connected to each other.
It is connected by a thick absorption liquid passage 64.

In the regenerator 53, a heat transfer coil 65 is provided in a state of being immersed in the liquid reservoir, and the heat transfer coil 65 is connected to the heat transfer circulation path 29;
A heat transfer coil 66 is provided in the gas phase of the evaporator 51, and the heat transfer circulation path 30 is connected to the heat transfer coil 66. Further, a heat transfer coil 67 is provided in the gas phase of the absorber 52.
Are provided in the gas phase portion of the condenser 54, respectively, and the heat transfer coils 67, 68 and the heat utilization section D are respectively provided.
Are connected by a heat transfer water return path 70 with a circulation pump 69 interposed therebetween, and the heat transfer coils 67 and 68 and the heat utilization section D are connected by a heat transfer water forward path 71.

That is, the absorption heat pump C operates as follows. In the evaporator 51, the refrigerant liquid disperser 5
The refrigerant liquid sprayed in 8 evaporates due to the heating action of the heat transfer coil 66 through which the heat transfer water heated by the exhaust gas heat exchanger 26 flows. The refrigerant vapor generated in the evaporator 51 is supplied to the absorber 52 through the communication path 55, and is absorbed in the absorber 52 by the absorbing liquid sprayed from the absorbing liquid spraying tool 63. In addition, the sensible heat of the absorbing liquid and the absorbing heat generated by the absorbing liquid absorbing the refrigerant vapor are provided to the heat transfer water returning from the heat utilization section D and flowing through the heat transfer coil 67.

The absorbing liquid having absorbed the refrigerant vapor in the absorber 52 is supplied to a regenerator 53 through a dilute absorbing liquid passage 62. In the regenerator 53, the absorbing liquid is heated by the heating action of the heat transfer coil 65 through which the heat transfer water heated by the cooling water heat exchanger 24 flows, and refrigerant vapor is generated. The refrigerant vapor generated in the regenerator 53 is supplied to the condenser 54 through the communication path 56. In the condenser 54, the refrigerant vapor returns from the heat utilization section D and returns to the heat transfer coil 6.
The cooling water is cooled and condensed by the heat transfer water flowing through 8, and the sensible heat and condensation heat of the refrigerant vapor are given to the heat transfer water. The refrigerant liquid generated in the condenser 54 is supplied to the evaporator 51 through the refrigerant liquid path 57.

The heat transfer water heated by flowing through the heat transfer coil 67 of the absorber 52 and the heat transfer water heated by flowing through the heat transfer coil 68 of the condenser 54 are connected to the heat transfer water outlet. 71, and is supplied to the heat utilization section D through the heat transfer water outward path 71, and the heat is recovered. The heat transfer water whose temperature has been reduced due to the recovery of heat in the heat utilization section D is supplied to the heat transfer coil 67 and the heat transfer coil 68.
Returned in parallel to each. That is, the heat generated by the absorber 52 and the heat generated by the condenser 54 are recovered by the heat transfer water and output by the heat transfer water.

Next, the results of evaluating the exhaust heat recovery performance by applying the present invention to a fuel cell power plant having an output of 200 kW will be described. In addition, for example, an aqueous solution of lithium bromide was used as the absorbing liquid, and water was used as the refrigerant, for example. The inflow temperature and outflow temperature of the heat transfer water to and from the cooling water heat exchanger 24 are 110 ° C. and 120 ° C., respectively, and the amount of heat recovered by the cooling water heat exchanger 24 is 89 Mcal / h.
It is. The inflow temperature and outflow temperature of the heat transfer water with respect to the exhaust gas heat exchanger 26 are 27 ° C. and 57 ° C., respectively, and the amount of heat recovered in the exhaust gas heat exchanger 26 is one.
00 Mcal / h. The temperature of the heat transfer water returning from the heat utilization section D to the heat transfer coils 67 and 68 is 60 degrees.
° C, and the heat utilization portion D
The temperature of the heat transfer water flowing out is 65 ° C,
The amount of heat recovered by the heat transfer coils 67 and 68 is 152
Mcal / h.

Accordingly, the recovery rate of the exhaust heat is determined by comparing the amount of heat 152 Mcal / h output from the absorption heat pump C with the amount of heat supplied to the absorption heat pump C (that is, the amount of heat recovered by the cooling water heat exchanger 24). It is obtained by dividing by the heat amount (heat amount obtained by adding the heat amount recovered in the exhaust gas heat exchanger 26) of 189 Mcal / h, and becomes 80%. When operated under these conditions, the concentration of the diluted absorption liquid was 57.2%, the concentration of the concentrated absorption liquid was 59.7%, and the heat amount 152 Mcal / h output from the absorption heat pump C was supplied to the absorption heat pump C. Heat recovered from the heat exchanger 24 for cooling water, which is the heat input
The cycle efficiency (COP) divided by 9 Mcal / h was 1.
72.

The During diagram of the absorption heat pump C at this time is as shown in FIG. In the During diagram shown in FIG. 3, the temperature TG of the absorbent coming out of the regenerator 53 is 1
The temperature TA at which the absorption is completed in the absorber 52 is 65 ° C., the evaporation temperature TE is 30.4 ° C., and the condensation temperature TC is 67.5 ° C. According to the During diagram, the higher the temperature of the exhaust heat supplied to the absorber 52 (that is, the recovered exhaust heat of the cooling water exhaust heat recovery means A), or the more the exhaust heat supplied to the evaporator 51 (that is, The higher the temperature of the exhaust heat exchanger 26 (exhaust heat recovered), the higher the recovery efficiency of the exhaust heat recovered by the absorption heat pump C and the higher the temperature of the heat output output from the absorption heat pump C.

[Another Embodiment] Next, another embodiment will be described. (A) The specific configuration of the cooling water exhaust heat recovery means A is not limited to the configuration exemplified in the above embodiment. For example, as shown in FIG. 4, the steam discharge passage 25 may be connected to the heat exchange coil 65, and the steam separated by the steam separator 9 may be passed through the heat exchange coil 65 as a heat source. . In this case, the cooling water exhaust heat recovery means A
Is provided with the steam-water separation device 9. FIG.
Reference numeral 39 denotes a condensed water return path that returns condensed water in which water vapor flowing through the heat transfer coil 65 is condensed to the cooling water outward path 6 as cooling water. In this case, the cooling water heat exchanger 24 can supply hot water to the outside through the hot water recovery passage 40.

Alternatively, the cooling water exhaust heat recovery means A is provided with both the cooling water heat exchanger 24 and the steam / water separator 9 and is provided to the regenerator 53 by the cooling water heat exchanger 24. It may be configured such that both the warm water thus obtained and the steam obtained by the steam separator 9 flow as heat sources. In this case, since the temperature of the absorbent flowing out of the regenerator 53 can be further increased, a higher temperature heat output can be obtained.

(B) The specific structure of the heat output means B is not limited to the case where the heat output means B is constituted by the absorption heat pump C exemplified in the above embodiment. For example, the high temperature recovered waste heat of the cooling water waste heat recovery means A and the exhaust gas heat exchanger 2
The exhaust gas heat exchanger 26 may be configured by a heat exchanger that exchanges heat with the low-temperature recovered waste heat of No. 6 to raise the temperature of the low-temperature recovered waste heat of the exhaust gas heat exchanger 26. In this case, for example, the cooling water heat exchanger 2
The low-temperature hot water obtained in the exhaust gas heat exchanger 26 is heated with the high-temperature hot water obtained in Step 4 (or steam obtained in the steam-water separator 9), for example, at 60 ° It can be configured to obtain C or higher warm water. However, in terms of improving the utilization rate of exhaust heat, it is better to use the absorption heat pump C.

(C) In the above-described embodiment, the exhaust gas heat exchanger 26 includes the fuel cell power generation unit 3 and the reformer 1
The example has been described in which exhaust heat is recovered from exhaust gas discharged from both of the burners 21 and cooling water is recovered. Instead of this, it may be configured to collect the exhaust heat from the exhaust gas discharged from either the fuel cell power generation unit 3 or the burner 21 of the reformer 17 and the cooling water.

(D) In the above embodiment, the heat output from the absorption heat pump C is the absorber 5
Although the case where both the generated heat of the condenser 2 and the condenser 54 are recovered is output, the recovered one of the two may be output.

(E) In the above embodiment, the case where a single-effect type is used as the absorption heat pump C has been exemplified, but a double-effect type can also be used.

(F) The type of the fuel cell power generation equipment to which the present invention can be applied is not limited to the phosphoric acid type exemplified in the above embodiment, but may be various types such as a solid electrolyte type. It can be applied to fuel cell power generation equipment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a fuel cell power generation facility

FIG. 2 is a block diagram showing a configuration of an absorption heat pump.

FIG. 3 is a diagram showing a During diagram of an absorption heat pump.

FIG. 4 is a block diagram showing the overall configuration of a fuel cell power generation facility according to another embodiment.

[Explanation of symbols]

 Reference Signs List 3 fuel cell power generation unit 7 water cooling means 9 steam-water separator 24 heat exchanger 26 exhaust gas exhaust heat recovery means 51 evaporator 52 absorber 53 regenerator 54 condenser A cooling water exhaust heat recovery means B heat output means C absorption heat pump

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masafumi Tatemori 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka F-term in Osaka Gas Co., Ltd. 5H027 AA04 BA01 BA06 BA09 BA16 BA17 CC06 DD00

Claims (5)

[Claims] A fuel cell and a fuel cell, wherein a fuel gas and an oxygen-containing gas are supplied, and an electrochemical reaction between hydrogen in the fuel gas and oxygen in the oxygen-containing gas is performed to generate electric power. A water cooling unit for water cooling the fuel cell power generation unit; an exhaust gas exhaust heat recovery unit for collecting exhaust heat while condensing water vapor from the exhaust gas discharged from the facility and collecting it as the cooling water; A cooling water exhaust heat recovery means for recovering exhaust heat higher than the recovery exhaust heat of the exhaust gas exhaust heat recovery means from the cooling water. And a heat output means for obtaining a higher heat output than the recovered exhaust heat of the exhaust gas exhaust heat recovery means using the recovered exhaust heat of the exhaust gas exhaust heat recovery means. Facility. 2. The heat output means includes: an evaporator for evaporating a refrigerant liquid; an absorber for absorbing refrigerant vapor generated by the evaporator into an absorption liquid; and a rare absorption liquid generated by the absorber. The regenerator includes a regenerator that generates refrigerant vapor by heating, and an absorption heat pump that includes a condenser that condenses the refrigerant vapor generated by the regenerator. Using the heat as a heat source for evaporating the refrigerant in the evaporator, and using the recovered waste heat of the cooling water waste heat recovery means as a heat source for heating the diluted absorbing liquid in the regenerator, the absorber The fuel cell power generation equipment according to claim 1, wherein the heat generated by the condenser or the heat generated by the condenser is recovered and output. 3. The cooling water exhaust heat recovery means includes a heat exchanger that heats the heated fluid using the cooling water discharged from the cooling means as a heating fluid. 3. The fuel cell power generation equipment according to claim 2, wherein the heated fluid is passed through the regenerator as a heat source. 4. The cooling water exhaust heat recovery means includes a steam / water separator for separating steam from cooling water discharged from the cooling means, and the steam separated by the steam / water separator is used as a heat source. 4. The fuel cell power plant according to claim 2, wherein the condensed water in which the steam is condensed is recovered as the cooling water. 5. 5. The fuel cell power plant according to claim 1, wherein the heat output means is configured to obtain a heat output of 60 ° C. or higher.