JPH05290865A - Fuel cell type power generation device - Google Patents

Abstract

PURPOSE:To provide a fuel cell type power generation device in which heat recovery of mixed exhaust gas can be performed sufficiently, and with which a necessary heat quantity can be supplied even to an absorption type refrigerating device. CONSTITUTION:Air introduced from an air blower 3 is preheated through a first and a second air preheaters 4, 5 to be supplied to a combustion part 2a of a reformer 2 and an air electrode 1b of a fuel cell 1. Combustion exhaust gas discharged from the combustion part 2a of the reformer 2 and air exhaust gas discharged from the air electrode 1b of the fuel cell are supplied to the first and the second air preheaters 4, 5 respectively. The combustion exhaust gas and the air exhaust gas become mixed exhaust gas to be discharged from open air discharge pipings 13 through a first calorifier 20 and a second calorifier 21. The heat quantity of the mixed exhaust gas is taken out at two-stage temperature levels at the first and the second calorifiers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell type power generator having a heat recovery device attached to the exhaust gas side of an air electrode of a fuel cell and the exhaust combustion gas side of a reformer.

[0002]

2. Description of the Related Art A fuel cell power generation system has high power generation efficiency, good environmental protection, and is capable of utilizing heat of exhaust gas. Therefore, it is marketed as an excellent power generation system suitable for urban areas. Is being introduced. For example, in a fuel cell power generator using city gas, a reformer that converts city gas into a reformed gas containing hydrogen as a main component or a direct current by reacting hydrogen in the reformed gas with oxygen in the air Although it has a fuel cell or the like for extracting electric power, in this case, the internal temperature of the reformer is maintained at, for example, 800 ° C, and the internal temperature of the fuel cell is maintained at, for example, 200 ° C to promote the reaction. Has been. Therefore, the exhaust gas discharged from the reformer and the fuel cell has a large amount of heat energy at high temperature, and the heat thereof is variously recovered and used through the heat exchanger and the like.

FIG. 5 shows the conventional heat recovery device reported in, for example, the 9th research presentation of the Japan Society for Energy and Resources (3-1 Hotel Plaza on-site fuel cell operation research P67-P69). 1 shows a fuel cell power generator.

In the figure, 1 is a fuel electrode 1a and an air electrode 1b.
And a cooler 1c are stacked, and a fuel cell for extracting electric power by an electrochemical reaction, a reformer 2 having a combustion section 2a and a reaction section 2b heated by the combustion section 2a, and 3 a reformer 2 is an air blower for supplying air to the combustion section 2a of the fuel cell 1 and the air electrode 1b of the fuel cell 1, and 4 is combustion exhaust gas discharged from the combustion section 2a of the reformer 2 for supplying combustion air to the combustion section 2a. A first air preheater 5 serving as a first heat exchange means for preheating is an air electrode 1 of the fuel cell 1.
A second air preheater as second heat exchange means for preheating the air supplied to the air electrode 1b with the air exhaust gas discharged from b, 6 is the air blower 3 to the first and second air preheaters 4, Air supply pipes up to 5, and 7 and 8 are preheated air pipes.

Reference numeral 9 is a combustion exhaust gas pipe for combustion exhaust gas discharged from the combustion section 2a of the reformer 2, 10 is an air exhaust gas pipe for air exhaust gas discharged from the air electrode 1b of the fuel cell 1, and 11 is a first A mixed exhaust gas pipe through which a mixed gas of the combustion exhaust gas discharged from the air preheater 4 and the air exhaust gas discharged from the second air preheater 5 (hereinafter referred to as mixed exhaust gas) flows, 12 uses heat of the mixed exhaust gas as hot water A water heater as a third heat exchange means for recovering, 13 is an exhaust gas discharge pipe for the mixed exhaust gas, 14 is a pipe for collecting condensed water in the mixed exhaust gas condensed by the water heater 12, and 15 is water for the water heater 12. Water supply pipe to be supplied, 16 is a hot water pipe for taking out hot water from the water heater 12, 17 is a heat utilization facility using the hot water supplied by the hot water pipe 16, and 18 is water in the mixed exhaust gas collected by the water heater 12. To To a water treatment device for supplying the necessary portions of the generator to the water.

Next, the operation of this fuel cell type power generator will be described. The combustion unit 2a of the reformer 2 is supplied with air from the air blower 3 preheated by the first air preheater 4 to burn a predetermined fuel, and this combustion changes the temperature of the reaction unit 2b. It is maintained at a predetermined temperature suitable for quality. Then, the combustion gas whose temperature is, for example, 500 ° C. discharged from the combustion section 2a is sent to the first air preheater 4 through the combustion exhaust gas pipe 9, and the temperature is, for example, 300 ° C.
Heat is recovered until. It should be noted that a predetermined reformed gas produced from city gas or the like in the reaction part 2b is subjected to a predetermined treatment and then supplied to the fuel electrode 1a of the fuel cell 1.

Air from the air blower 3 preheated by the second air preheater 5 is supplied to the air electrode 1b of the fuel cell 1, and oxygen in the air and reformed gas in the fuel electrode 1a are supplied. Electric power is taken out from the fuel cell 1 by the electrochemical reaction and the water is generated on the air electrode 1b side. Then, the temperature of the air, which is exhausted from the air electrode 1b and consists of partially consumed oxygen and generated water (steam), is 20
The 0 ° C. air exhaust gas is sent to the second air preheater 5 through the air exhaust gas pipe 10, and heat is recovered until the temperature reaches 90 ° C., for example. Then, the combustion exhaust gas and the air exhaust gas are collected in the mixed exhaust gas pipe 11 to become a mixed exhaust gas of about 160 ° C. The mixed exhaust gas contains about 30% steam generated by the combustion reaction in the combustion section 2a of the reformer 2 and the electrochemical reaction in the fuel cell 1.

The mixed exhaust gas is mixed exhaust gas pipe 1
1 is sent to the water heater 12 to recover the heat to the hot water side and is discharged to the outside from the atmosphere discharge pipe 13, and the steam in the mixed exhaust gas is condensed and collected to the water treatment device 18 side. Here, as the temperature of the mixed exhaust gas is lowered, the amount of heat recoverable from the mixed exhaust gas and the amount of condensed water can be increased, but in this case, the heat utilization facility 17
Therefore, the outlet temperature of the mixed exhaust gas water heater 12 is about 50
The temperature can be lowered to ℃ (containing about 12% steam), and this fuel cell power generator can be operated using only the water recovered by the water treatment device 18 without replenishing water from the outside. There is. The water supply temperature supplied to the water heater 12 through the water supply pipe 15 is about 25 ° C.
The temperature of the hot water taken from 2 to the hot water pipe 16 side is about 70
℃. And this hot water of about 70 ℃ is used for heat utilization equipment 17
Is used as a heat source for hot water supply.

On the other hand, in such a fuel cell type power generator, the heat utilization facility 1 is utilized by utilizing the heat recovered from the mixed exhaust gas.
Air conditioning (cooling) inside the equipment by operating the absorption type refrigeration equipment, etc.
Is desired. In this case, a heat source of 80 ° C. to 90 ° C. or higher is required in the absorption refrigerating apparatus, etc., and therefore it is necessary to heat the warm water supplied at 80 ° C. by the mixed exhaust gas to 90 ° C. or higher. In addition, the absorption refrigerating apparatus is, for example, an absorber that cools ammonia vapor while absorbing it in ammonia water, a pump that pressurizes this ammonia water, and a high-pressure ammonia gas that heats the pressurized ammonia water. And a condenser for cooling the ammonia gas to condense it as ammonia liquid, an expansion valve for the ammonia liquid, and an evaporator for evaporating the ammonia liquid to exert a refrigerating effect on the ammonia liquid. For example, the heat recovered from the mixed exhaust gas is used as a heat source for heating the absorber.

[0010]

However, if a heat recovery device serving as a heat source for an absorption refrigerating device is provided in the mixed exhaust gas pipe 11 of the conventional fuel cell type power generator, the temperature of the mixed exhaust gas at the outlet of the heat recovery device is increased. However, there was a problem that heat could not be sufficiently recovered from this mixed exhaust gas. For this reason, condensed water cannot be sufficiently recovered from the mixed exhaust gas, make-up water is required in the device, and the atmosphere discharge pipe 1
There was a problem that the mixed exhaust gas discharged from No. 3 comes into contact with the atmosphere and produces white smoke. In addition, there is a problem in that if a cooling facility such as a cooling tower is provided to prevent this white smoke, the facility cost will increase.

The present invention has been made in order to solve the above problems, and is capable of sufficiently recovering heat of mixed exhaust gas, and is also required for an absorption refrigerating device of heat utilization equipment. It is an object of the present invention to provide a fuel cell power generation device that can supply a large amount of heat.

[0012]

According to a first aspect of the present invention, there is provided a fuel cell type power generator, a fuel cell, a reformer for supplying a reformed gas to the fuel cell, and an exhaust gas from the reformer. From the first heat exchange means for recovering heat from the combustion exhaust gas, the second heat exchange means for recovering heat from the air exhaust gas discharged from the air electrode of the fuel cell, and the first and second heat exchange means. Third heat exchange means for recovering heat from the exhaust gas mixed exhaust gas of the combustion exhaust gas and air exhaust gas, and a water treatment device for processing and recovering condensed water generated from the mixed exhaust gas in the third heat exchange means In a fuel cell power generator having
The third heat exchange means is composed of a high temperature side heat exchange means provided on the high temperature side of the mixed exhaust gas and a low temperature side heat exchange means provided on the low temperature side.

In the fuel cell type power generator according to the second aspect of the present invention, the third heat exchange means includes the high temperature side heat exchange means provided on the high temperature side of the mixed exhaust gas and the low temperature side provided on the low temperature side. In addition to the heat exchanging means, a bypass passage having a flow rate adjusting means is provided on the combustion exhaust gas side of the first heat exchanging means.

In the fuel cell type power generator according to the third aspect of the present invention, the third heat exchanging means includes a high temperature side heat exchanging means provided on the high temperature side of the mixed exhaust gas and a low temperature side provided on the low temperature side. In addition to the heat exchanging means, a bypass passage having flow rate adjusting means is provided on each of the combustion exhaust gas side of the first heat exchanging means and the air exhaust gas side of the second heat exchanging means.

In the fuel cell power generator according to the fourth aspect of the present invention, a bypass passage having a flow rate adjusting means is provided on the combustion exhaust gas side of the first heat exchange means to detect the temperature of the reaction section of the reformer. And a control means for controlling the flow rate adjusting means according to the temperature detected by the temperature detector to adjust the flow rate of the combustion exhaust gas flowing through the bypass passage.

[0016]

First, the operation of the first invention of the present invention will be described. The combustion exhaust gas discharged from the reformer cooled by the first heat exchange means and the air exhaust gas discharged from the air electrode of the fuel cell cooled by the second heat exchange means are combined as a mixed exhaust gas. After that, the heat is recovered and cooled by the third heat exchange means. Then, in the third heat exchange means, condensed water is generated from the mixed exhaust gas, and this condensed water is recovered by the water treatment device and used in the device. In this case, since the mixed exhaust gas needs to be cooled to a predetermined low temperature in order to operate the apparatus only with condensed water, a high-temperature heat source is required with the recovered heat obtained by the third heat exchange means. It is necessary to operate absorption refrigeration equipment.

Therefore, the third heat exchange means is composed of two parts, a high temperature side heat exchange means and a low temperature side heat exchange means. The high temperature heat that becomes, the heat of the low temperature side mixed exhaust gas is sufficiently recovered by the low temperature side exchange means to lower the temperature of the mixed exhaust gas to a predetermined low temperature, and the necessary condensed water is recovered from the mixed exhaust gas, The heat quantity of the mixed exhaust gas was taken out in two steps.

Next, the operation of the second, third and fourth aspects of the present invention will be described. In these inventions, a large amount of heat can be temporarily obtained from the mixed exhaust gas by the high temperature side heat exchanging means of the third heat exchanging means, and the heat quantity required at the time of starting the absorption refrigerating device is secured. I made it possible.

That is, in the second aspect of the invention, the flow rate adjusting means provided in the bypass passage on the combustion exhaust gas side of the first heat exchange means is opened, and the uncooled combustion exhaust gas is exchanged with the high temperature side of the third heat exchange means. Introduced into the above and raising the temperature of the mixed exhaust gas, a large amount of heat can be obtained by this high temperature side heat exchange means. In the third invention, the first
Of the heat exchanging means, the flow rate adjusting means provided in the bypass passage on the combustion exhaust gas side and the flow rate adjusting means provided in the bypass passage on the air exhaust gas side of the second heat exchanging means are also opened, and the combustion exhaust gas and air not cooled By introducing the exhaust gas into the high temperature side heat exchange means of the third heat exchange means and raising the temperature of the mixed exhaust gas, a large amount of heat can be obtained by the high temperature side heat exchange means.

Further, according to the fourth aspect of the invention, based on the temperature detected by the temperature detector, the control means opens the flow rate adjusting means provided in the bypass passage on the combustion exhaust gas side of the first heat exchanging means to remove the combustion exhaust gas. The third without the first heat exchange means
By introducing into the high temperature side exchange means of the heat exchange means and raising the temperature of the mixed exhaust gas, a large amount of heat can be obtained by the high temperature side heat exchange means. As a method of opening the flow rate adjusting means by the control means, for example, the set value of the temperature of the reaction part of the temperature detector may be lowered.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

Example 1. FIG. 1 is a system diagram of a fuel cell type power generator showing an embodiment according to the first invention of the present invention. In the figure, the same or corresponding portions as those of the conventional fuel cell type power generator shown in FIG. 5 are the same. The reference numerals are given and the description thereof is omitted.

In the figure, 20 is a first water heater as the high temperature side heat exchange means of the third heat exchange means, and heats the heat having the high temperature mixed exhaust gas flowing upstream of the mixed exhaust gas pipe 11 to the high temperature hot water side. This high-temperature hot water is recovered and used for heat utilization equipment 17
To supply. Reference numeral 21 is a second water heater as a low temperature side heat exchanging means of the third heat exchanging means, which recovers the heat of the low temperature mixed exhaust gas flowing on the downstream side of the mixed exhaust gas pipe 11 to the low temperature hot water side. Facility for utilizing hot water as heat 17
To supply. 22 is a hot water supply pipe for supplying hot water to the first water heater 20, 23 is a high temperature hot water pipe for taking out the hot water heated by the first water heater 20 as high temperature hot water, 2
4 is a pipe for collecting water in the mixed exhaust gas condensed in the second water heater 21, 25 is a water supply pipe for supplying water to the second water heater 21, and 26 is water heated by the second water heater 21. Is a low temperature hot water pipe for taking out as low temperature hot water.

Next, the operation of the fuel cell type power generator will be described. In the combustion section 2a of the reformer 2, the air preheated by the first air preheater 4 is supplied to perform combustion,
By this combustion, the temperature of the reaction section 2b is maintained at a predetermined temperature suitable for reforming. The combustion exhaust gas discharged from the combustion unit 2a is, for example, 500 by the first air preheater 4.
Cooled from ℃ to 300 ℃. Further, the air preheated by the second air preheater 5 is supplied to the air electrode 1b of the fuel cell 1, and the oxygen in the air and the reformed gas in the fuel electrode 1a supplied from the reformer 2 are supplied. As a result, electric power is taken out from the fuel cell 1 and water is generated on the air electrode 1b side.
The air exhaust gas discharged from the air electrode 1b is cooled by the second air preheater 5 to, for example, 200 ° C to 90 ° C. Combustion exhaust gas and air exhaust gas are mixed exhaust gas piping 1
Approximately 160 ℃ with about 30% steam collected in 1
It becomes a mixed exhaust gas.

Next, the mixed exhaust gas is sent to the first water heater 20, and the hot water of about 80 ° C. supplied to the first water heater 20 via the hot water supply pipe 22 is heated to high temperature hot water of about 90 ° C. or more. And the gas temperature is 160 ° C to 100 ° C, for example.
Can be lowered to. That is, hot water of 90 ° C. or higher can be supplied to the heat utilization facility 17 side through the high-temperature hot water pipe 23, and the heat utilization facility 17 side can operate the absorption refrigerating device or the like using the high-temperature hot water. Further, the mixed exhaust gas is sent to the second water heater 21, and the second water heater 2
1. Water of about 25 ° C. supplied to the No. 1 through the water supply pipe 25 is heated to low temperature hot water of about 65 ° C., and its gas temperature is 100 ° C.
To about 50 ° C. and is discharged from the atmosphere discharge pipe 13 in a low temperature state.

Therefore, with this second water heater 21,
Steam in the mixed flue gas is condensed water as water treatment device 18
It is recovered to the side, and by this condensed water it is possible to secure the water necessary for the fuel cell power generator without makeup water,
The low temperature hot water of about 65 ° C. supplied to the heat utilization equipment 17 side through the low temperature hot water pipe 26 enables the heat utilization equipment 17 side to secure a heat source or the like for hot water supply.

Example 2. FIG. 2 is a system diagram of a fuel cell power generator of one embodiment according to the second invention of the present invention.

Since the absorption type refrigerating device on the side of the heat utilization facility 17 generally requires 1.2 to 1.5 times the amount of heat at the time of start-up, it is necessary to secure a temporary amount of heat at start-up. Only devices with small capacity can be installed. Therefore, in the second embodiment, a bypass pipe 27 communicating with the mixed exhaust gas pipe 11 is provided on the combustion exhaust gas pipe 9 side of the first air preheater 4,
The bypass pipe 27 is provided with a first adjusting valve 28 as a flow rate adjusting means capable of adjusting the flow rate of the combustion exhaust gas flowing through the bypass pipe 27, and the first water heater 20 temporarily increases a large amount at the time of starting the absorption refrigeration system or the like. The required amount of heat can be secured. The other components are the same as those of the fuel cell power generator of the first embodiment.

The combustion exhaust gas of, for example, 500 ° C. discharged from the combustion section 2a of the reformer 2 is the first exhaust gas during normal operation.
After being passed through the air preheater 4 and the temperature thereof is lowered to, for example, 300 ° C., it is supplied to the mixed exhaust gas pipe 11. The first regulating valve 2 is supplied when necessary when starting the absorption refrigeration system or the like.
After 8 pm, a part of the combustion gas at 500 ° C. is supplied to the mixed exhaust gas pipe 11 without passing through the first air preheater 4 to raise the temperature of the mixed exhaust gas, and the temperature of the high temperature hot water of the first water heater 20 is increased. By making it possible to raise the temperature, it is possible to cover the heat amount at the time of starting the absorption refrigerating device and the like. Therefore, it is possible to use an absorption refrigerating device or the like having a large rated capacity.

Example 3. FIG. 3 is a system diagram of a fuel cell power generator of one embodiment according to the third invention of the present invention.

In the third embodiment, similarly to the second embodiment, a bypass pipe 27 communicating with the mixed exhaust gas pipe 11 is provided on the combustion exhaust gas pipe 9 side of the first air preheater 4, and the bypass pipe 27 is provided with a bypass exhaust gas. A first adjusting valve 28 as a flow rate adjusting means capable of adjusting the flow rate is provided, and a bypass pipe 29 communicating with the mixed exhaust gas pipe 11 is provided on the air exhaust gas pipe 10 side of the second air preheater 5, and the bypass pipe 29 is provided.
A second adjusting valve 30 is provided as a flow rate adjusting means capable of adjusting the flow rate of the air exhaust gas, and the second adjusting valve 30 and the first adjusting valve 28 temporarily increase a large amount at the time of starting the absorption refrigerating device or the like. The required amount of heat can be secured by the first water heater 20. The other components are the same as those of the fuel cell power generator of the first embodiment.

The air exhaust gas of, for example, 200 ° C. discharged from the air electrode 1b of the fuel cell 1 is secondarily generated during normal operation.
After being passed through the air preheater 5 and the temperature thereof is lowered to, for example, 90 ° C., it is supplied to the mixed exhaust gas pipe 11. However, when necessary, the second adjusting valve 30 is opened to remove a part of the 200 ° C. Mixed exhaust gas pipe 11 without the second air preheater 5
Can be raised to raise the temperature of the mixed exhaust gas.
Therefore, when the absorption refrigerating device or the like is activated, the temperature of the mixed exhaust gas can be raised more than in the second embodiment by opening the first adjusting valve 28 provided in the bypass pipe 27 and opening the second adjusting valve 30. As a result, the temperature of the high-temperature hot water recovered by the first water heater 20 can be raised by an amount commensurate with this. Therefore, also in the third embodiment, the same effect as that of the fuel cell power generator of the second embodiment can be obtained.

Example 4. FIG. 4 is a system diagram of a fuel cell type power generator of one embodiment according to the fourth invention of the present invention.

In the fourth embodiment, the first regulating valve 2 provided in the bypass pipe 27 of the fuel cell power generator of the first embodiment
In order to control the opening and closing of the reactor 8 according to the temperature of the reaction section 2b of the reformer 2, a temperature detector 31 for detecting the reaction section temperature is provided in the reaction section 2b of the reformer 2 and this temperature detector A temperature controller 32 is provided as a control means for controlling the opening / closing of the first adjusting valve 28 based on the temperature signal from 31. The other components are the same as those of the fuel cell power generator of the first embodiment.

The temperature controller 32 opens the first adjusting valve 28 if the temperature of the reaction section 2b of the reformer 2 exceeds the set value, and opens the first control valve 28 if the temperature of the reaction section 2b of the reformer 2 drops below the set value. This is for closing the first adjusting valve 28 and adjusting the temperature of the reaction part 2b. That is, the reaction section 2b of the reformer 2
Temperature rises, the first regulating valve 28 opens and the bypass pipe 2
If the amount of combustion exhaust gas passing through 7 increases, the first air preheater 4
The amount of combustion exhaust gas introduced into the first air preheater 4 decreases
At this time, the amount of heat recovered on the side of the air supplied to the fuel portion 2b of the reformer 2 is reduced, the amount of heat generated in the combustion portion 2a is reduced, and the temperature of the reaction portion 2b is lowered. ,
If the temperature of the reaction section 2b decreases and the first regulating valve 28 closes to block the combustion gas passing through the bypass pipe 27, the amount of heat recovered to the air side in the first air preheater 4 increases, and the combustion section 2a The amount of heat generated at the temperature of the reaction section 2b increases, and the temperature of the reaction section 2b rises.

Therefore, at the time of starting the absorption refrigerating apparatus or the like, the temperature set value of the temperature controller 32 is lowered to the lower limit value of the temperature of the reaction section 2b, and this temperature set value is set to the temperature detector 3.
If the first regulating valve 28 is opened by setting the temperature of the reaction portion 2b detected at 1 to be smaller than the indicated value, a part of the high temperature combustion gas of about 500 ° C. will flow into the mixed exhaust gas pipe 11. As a result, the temperature of the mixed exhaust gas rises, and it becomes possible to raise the temperature of the high-temperature hot water recovered by the first water heater 20. You will be able to cover. Therefore, also in the fourth embodiment, the same as the fuel cell power generator of the second embodiment can be obtained.

[0037]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, the first heat for recovering heat from the fuel cell, the reformer for supplying the reformed gas to the fuel cell, and the combustion exhaust gas discharged from the reformer. An exchanging means, a second heat exchanging means for recovering heat from the air exhaust gas discharged from the air electrode of the fuel cell, and a mixed exhaust gas of the combustion exhaust gas and the air exhaust gas discharged from the first and second heat exchanging means. In a fuel cell power generation device having a third heat exchange means for recovering heat and a water treatment device for treating and recovering condensed water generated from the mixed exhaust gas in the third heat exchange means, Since the means is composed of the high temperature side heat exchange means provided on the high temperature side of the mixed exhaust gas and the low temperature side heat exchange means provided on the low temperature side, the exhaust heat of the mixed exhaust gas can be extracted at two temperature levels. Predetermined, which can obtain the necessary condensed water Temperature until it is possible to sufficiently make heat recovery of mixed exhaust gases, and can supply heat required in the absorption refrigerating apparatus such as a predetermined high-temperature heat source is required.

Further, according to the second aspect of the present invention, the third heat exchange means is the high temperature side heat exchange means provided on the high temperature side of the mixed exhaust gas and the low temperature side heat exchange means provided on the low temperature side. Since the bypass passage having the flow rate adjusting means is provided on the combustion gas side of the first heat exchanging means, a large amount of the mixed exhaust gas is temporarily increased by the high temperature side heat exchanging means of the third heat exchanging means. The heat quantity required for starting the absorption refrigeration system, etc. can be secured by the heat exchanging means on the high temperature side, and the effect of being able to use exhaust heat equipment with a large rated value can also be obtained. it can.

Furthermore, according to the third aspect of the present invention,
The third heat exchange means is composed of a high temperature side heat exchange means provided on the high temperature side of the mixed exhaust gas and a low temperature side heat exchange means provided on the low temperature side, and at the same time the fuel exhaust gas side of the first heat exchange means. Since the bypass passages having the flow rate adjusting means are provided on the air exhaust gas side of the second heat exchange means and the third heat exchange means,
It becomes possible to temporarily obtain a large amount of heat from the mixed exhaust gas in the high temperature side heat exchanging means of the heat exchanging means. The effect that it can be secured can also be obtained.

According to the fourth aspect of the present invention, a temperature detecting means for detecting the temperature of the reaction part of the reformer is provided by providing a bypass passage having a flow rate adjusting means on the combustion exhaust gas side of the first heat exchange means. Since the control unit is provided and the flow rate adjusting unit is controlled by the temperature detected by the temperature detector to adjust the flow rate of the combustion exhaust gas flowing through the bypass passage, the heat exchange on the high temperature side of the third heat exchanging unit is performed. It becomes possible to temporarily obtain a large amount of heat from the mixed exhaust gas by the means, and it is also possible to obtain the effect that the high-temperature side heat exchange means can secure the amount of heat required at the time of starting the absorption refrigeration system or the like. ..

[Brief description of drawings]

FIG. 1 is a system diagram of a fuel cell type power generator showing a first embodiment of the present invention.

FIG. 2 is a system diagram of a fuel cell type power generator showing Embodiment 2 of the present invention.

FIG. 3 is a system diagram of a fuel cell type power generator showing Embodiment 3 of the present invention.

FIG. 4 is a system diagram of a fuel cell type power generator showing Embodiment 4 of the present invention.

FIG. 5 is a system diagram showing an example of a conventional fuel cell power generator.

[Explanation of symbols]

 1 Fuel Cell 1a Fuel Electrode 1b Air Electrode 2 Reformer 4 First Air Preheater (First Heat Exchange Means) 5 Second Air Preheater (Second Heat Exchange Means) 17 Water Treatment Device 20 First Water Heater (High temperature side heat exchange means) 21 Second water heater (low temperature side heat exchange means) 27 Bypass piping (bypass passage) 28 First adjusting valve (flow rate adjusting means) 29 Bypass piping (bypass passage) 30 Second adjusting valve (flow rate) Adjusting means) 31 Temperature detector 32 Temperature controller (control means)

[Procedure amendment]

[Submission date] November 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

The temperature controller 32 let open the first control valve 28 is higher than the temperature of the reaction portion 2b of the reformer 2 is a set value, only low than the temperature of the reaction portion 2b of the reformer 2 is set value lever This is for closing the first adjusting valve 28 and adjusting the temperature of the reaction part 2b. That is, the reaction section 2b of the reformer 2
Temperature rises, the first regulating valve 28 opens and the bypass pipe 2
If the amount of combustion exhaust gas passing through 7 increases, the first air preheater 4
The amount of combustion exhaust gas introduced into the first air preheater 4 decreases
At this time, the amount of heat recovered on the side of the air supplied to the fuel portion 2b of the reformer 2 is reduced, the amount of heat generated in the combustion portion 2a is reduced, and the temperature of the reaction portion 2b is lowered. ,
If the temperature of the reaction section 2b decreases and the first regulating valve 28 closes to block the combustion gas passing through the bypass pipe 27, the amount of heat recovered to the air side in the first air preheater 4 increases, and the combustion section 2a The amount of heat generated at the temperature of the reaction section 2b increases, and the temperature of the reaction section 2b rises.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

Therefore, at the time of starting the absorption refrigerating apparatus or the like, the temperature set value of the temperature controller 32 is lowered to the lower limit value of the temperature of the reaction section 2b, and this temperature set value is set to the temperature detector 3.
If the first regulating valve 28 is opened by setting the temperature of the reaction portion 2b detected at 1 to be smaller than the indicated value, a part of the high temperature combustion gas of about 500 ° C. will flow into the mixed exhaust gas pipe 11. As a result, the temperature of the mixed exhaust gas rises, and it becomes possible to raise the temperature of the high-temperature hot water recovered by the first water heater 20. You will be able to cover. Therefore, also in the fourth embodiment , the same effect as that of the fuel cell power generator of the second embodiment can be obtained.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of reference numerals] 1 fuel cell 1a fuel electrode 1b air electrode 2 reformer 4 first air preheater (first heat exchange means) 5 second air preheater (second heat exchange means) 17 heat utilization equipment 20 1st water heater (high temperature side heat exchange means) 21 2nd water heater (low temperature side heat exchange means) 27 Bypass piping (bypass passage) 28 1st adjustment valve (flow rate adjustment means) 29 Bypass piping (bypass passage) 30th 2 adjusting valve (flow rate adjusting means) 31 temperature detector 32 temperature controller (control means)

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (4)

[Claims] 1. A fuel cell, a reformer for supplying reformed gas to the fuel cell, first heat exchange means for recovering heat from combustion exhaust gas discharged from the reformer, and the fuel cell. Second heat exchanging means for recovering heat from the air exhaust gas discharged from the air electrode, and heat from the mixed exhaust gas of the combustion exhaust gas and the air exhaust gas discharged from the first and second heat exchanging means. A third heat exchange means for recovering, and the third heat exchange means
And a water treatment device for treating and recovering condensed water generated from the mixed exhaust gas in the heat exchange means, the third heat exchange means is provided on a high temperature side of the mixed exhaust gas. A high temperature side heat exchange means and a low temperature side heat exchange means provided on a low temperature side, and heat recovery from the mixed exhaust gas is performed by the high temperature side heat exchange means and the low temperature side heat exchange means. Characteristic fuel cell power generator. 2. A fuel cell, a reformer for supplying reformed gas to the fuel cell, first heat exchange means for recovering heat from combustion exhaust gas discharged from the reformer, and the fuel cell. Second heat exchanging means for recovering heat from the air exhaust gas discharged from the air electrode, and heat from the mixed exhaust gas of the combustion exhaust gas and the air exhaust gas discharged from the first and second heat exchanging means. A third heat exchange means for recovering, and the third heat exchange means
And a water treatment device for treating and recovering condensed water generated from the mixed exhaust gas in the heat exchange means, wherein the third heat exchange means is provided on a high temperature side of the mixed exhaust gas. A high temperature side heat exchange means and a low temperature side heat exchange means provided on a low temperature side, and a bypass passage having a flow rate adjusting means is provided on the combustion exhaust gas side of the first heat exchange means. Fuel cell power generator. 3. A fuel cell, a reformer for supplying reformed gas to the fuel cell, first heat exchange means for recovering heat from combustion exhaust gas discharged from the reformer, and the fuel cell. Second heat exchanging means for recovering heat from the air exhaust gas discharged from the air electrode, and heat from the mixed exhaust gas of the combustion exhaust gas and the air exhaust gas discharged from the first and second heat exchanging means. A third heat exchange means for recovering, and the third heat exchange means
And a water treatment device for treating and recovering condensed water generated from the mixed exhaust gas in the heat exchange means, wherein the third heat exchange means is provided on a high temperature side of the mixed exhaust gas. A high temperature side heat exchange means and a low temperature side heat exchange means provided on a low temperature side, and is provided on the combustion exhaust gas side of the first heat exchange means and on the air exhaust gas side of the second heat exchange means. A fuel cell type power generator comprising a bypass passage each having a flow rate adjusting means. 4. A fuel cell, a reformer for supplying a reformed gas to the fuel cell, a first heat exchange means for recovering heat from combustion exhaust gas discharged from the reformer, and the fuel cell. Second heat exchanging means for recovering heat from the air exhaust gas discharged from the air electrode, and heat from the mixed exhaust gas of the combustion exhaust gas and the air exhaust gas discharged from the first and second heat exchanging means. A third heat exchange means for recovering, and the third heat exchange means
A water treatment device for treating and recovering condensed water generated from the mixed exhaust gas in the heat exchanging means, and a flow rate adjusting means on the combustion exhaust gas side of the first heat exchanging means. A bypass passage is provided, and a temperature detector that detects the temperature of the reaction portion of the reformer is provided, and
A fuel cell power generator comprising control means for controlling the flow rate adjusting means according to the temperature detected by the temperature detector to adjust the flow rate of combustion exhaust gas flowing through the bypass passage.