JP2001068135A - Fuel cell reforming system - Google Patents

Abstract

(57) [PROBLEMS] To reduce heat loss in a reactor and effectively utilize exhaust heat from the reactor in a fuel cell reforming system for reforming a source gas and supplying the reformed gas to a fuel cell body. . SOLUTION: The reformer (13), the high-temperature transformer (14), the low-temperature transformer (15) and the selective oxidizer (16) each have an inner heat insulator (9).
Covered with. Furthermore, these reactors (13), (14), (1
The entirety of (5) and (16) is covered with an outer heat insulating material (29). The reactor is located between the inner insulation (9) and the outer insulation (29).
(13), (14), (15), (16) heat recovery heat exchanger for recovering waste heat
(31) is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell reforming system for reforming a raw material gas and supplying the reformed gas to a fuel cell.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 10-3349
As disclosed in Japanese Patent Publication No. 35, a fuel cell power generation system is used as a power source for facilities such as hospitals, schools, and buildings.

FIG. 15 is a piping diagram schematically showing the configuration of a fuel cell power generation system (100) using a polymer electrolyte fuel cell. The fuel cell power generation system (100) has a reformer (101) that adds water vapor to city gas to reform the gas, and converts carbon monoxide generated in the reformer (101) into carbon dioxide. Transformer (102) and transformer (102)
A selective oxidizer (103) for further oxidizing carbon monoxide contained in the reformed gas from the fuel cell and a fuel cell main body (104) are provided in this order.

In a reformer (101), a mixed gas of desulfurized city gas and steam is heated in a combustor (105).
A reformed gas containing carbon dioxide and hydrogen is generated in the presence of the catalyst. At this time, the anode exhaust gas containing hydrogen and the cathode exhaust gas containing air, which have not completely reacted in the fuel cell main body (104), are returned to the reformer (101), and are used as combustion sources for the combustor (105). The reformed gas from the reformer (101) also contains carbon monoxide, and this carbon monoxide is converted into carbon dioxide by the shift converter (102). Also, in order to further reduce the amount of carbon monoxide, which causes a reduction in the efficiency of the system, the reformed gas from the shift converter (102) is mixed with air in the selective oxidizer (103) and remains in the reformed gas. The resulting carbon monoxide is oxidized, and the carbon monoxide in the reformed gas is further removed. As a result, a reformed gas having a very low carbon monoxide content is supplied to the fuel cell body (104). Fuel cell body (10
In (4), the hydrogen in the reformed gas sent from the selective oxidizer (103) is combined with the oxygen contained in the supply air, and the ions generated at that time are converted to the charges of the cathode (106) and the anode (107). By changing, power is obtained.

[0005]

The reformer (10)
1) The reaction temperatures in the transformer (102) and the selective oxidizer (103) are, for example, 800 ° C., 400-200 ° C., respectively.
The temperature is about 150 ° C., and both are high temperatures. for that reason,
A large amount of heat is released from these reactors (101), (102), and (103) to the outside air at room temperature, and a large amount of heat loss occurs in the entire system.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to reduce the heat loss of the reactor and improve the efficiency of the system.

[0007]

In order to achieve the above object, the present invention provides a method for covering an individual reactor with an inner heat insulating material and simultaneously covering the whole of the plurality of reactors covered with the inner heat insulating material with the outer heat insulating material. It was decided to cover it integrally with the material. Further, in order to effectively utilize the exhaust heat from the reactor, a heat recovery heat exchanger for recovering the exhaust heat is provided.

Specifically, the reforming system for a fuel cell according to the present invention comprises a reformer (13), a transformer (14, 15), and a selective oxidizer.
16. A fuel cell reforming system having at least three reactors comprising: (16) an inner heat insulator (9) for individually covering at least two reactors; and And an outer heat insulating material (29) for integrally covering at least two reactors including the above reactor.

As a result, the at least two reactors are each covered by an inner insulation (9) and at the same time an outer insulation is provided.
Since they are covered by (29), the heat loss of these reactors is reduced. In particular, since the temperature of the reactor is higher than the outside air, the temperature between the inner heat insulator (9) and the outer heat insulator (29) (outside the inner heat insulator (9) and inside the outer heat insulator (29)) is increased. ), A high-temperature region is formed. As a result, the temperature difference between the inside and outside of the inner heat insulating material (9) becomes smaller, so that when the total amount of the heat insulating material (9, 29) is the same, the heat insulation is more effective than the case where the individual reactors are simply covered with the heat insulating material. Is performed efficiently. Further, since a space is secured between the inner heat insulating material (9) and the outer heat insulating material (29), it becomes easy to install equipment for heat recovery.

[0010] At least two of the reactors covered by the outer insulation (29) are integrated with each other to form one inner insulation.
(9) It may be covered. This reduces the overall size of the reactor and thus the overall size of the system. Also, the surface area of the reactor is reduced and heat loss is reduced.

A tank (22) for storing water for reforming may be provided inside the outer heat insulating material (29). Thereby, at least two reactors and the tank (22) are accommodated inside the outer heat insulating material (29), and the heat loss of the tank (22) is reduced.

A heat recovery heat exchanger (30) for recovering exhaust heat of the reactor (13, 14, 15, 16) may be provided inside or inside the outer heat insulating material (29). . Thereby, the exhaust heat of the reactor is recovered via the heat recovery heat exchanger (30), and the effective use of the exhaust heat is achieved while reducing the heat loss of the reactor.

The heat recovery heat exchanger (30) may include a first heat exchanger (31) provided outside the inner heat insulator (9) and inside the outer heat insulator (29). As a result, the first heat exchanger (31) for recovering exhaust heat has the inner heat insulator (9) and the outer heat insulator (2).
9), the space between the inner heat insulating material (9) and the outer heat insulating material (29) is effectively utilized.

The heat recovery heat exchanger (30) may be connected to at least one of the reactors covered by the outer heat insulator (29) or to the outer heat insulator.
It may include a second heat exchanger (32) provided in the reformed gas flow path (42) between the reactors covered by (29). Thus, since the second heat exchanger (32) for exhaust heat recovery is provided in the reactor or the reformed gas flow path (42), the exhaust heat is directly collected from the reformed gas, Effective utilization of heat is achieved.

The reformer (13) is provided with a combustor (19), and the heat recovery heat exchanger (30) is provided with a third heat exchanger for recovering exhaust heat of exhaust gas from the combustor (19). A vessel (33) may be included.
This allows the combustor (19) to pass through the third heat exchanger (33).
Exhaust heat is recovered from the exhaust gas, and the exhaust heat is effectively used.

The heat recovery heat exchanger (30) may include a fourth heat exchanger (34) embedded in the outer heat insulating material (29). As a result, the outer heat insulator (29) is connected via the fourth heat exchanger (34).
The exhaust heat passing through is recovered, and the exhaust heat is effectively used.

The heat recovery heat exchanger (30) may include a plate heat exchanger (35). As a result, the plate heat exchanger (35) has a high heat exchange efficiency and is compact, so that the entire system is reduced in size and the efficiency of recovering exhaust heat is improved.

The heat recovery heat exchanger (30) comprises a reactor (13, 14, 15,
16) may include a heat transfer tube (36) arranged to directly contact the heat transfer tube. Thereby, heat exchange is performed between the reactor and the fluid inside the heat transfer tube (36) via the heat transfer tube (36). As a result, the exhaust heat of the reactor is recovered by the fluid flowing inside the heat transfer tube (36). Therefore, the heat recovery heat exchanger (30) can be obtained with a simple and inexpensive configuration.

The heat recovery heat exchanger (30) may be connected to at least one of the reactors covered by the outer heat insulator (29) or to the outer heat insulator.
A second heat exchanger (32) provided in a reformed gas flow path (42) between the reactors covered by the (29), the first heat exchanger (31) and the second heat exchanger (32) may be connected to each other via a heat medium flow path (43) so that a predetermined heat medium flows.
Thereby, the heat medium recovers exhaust heat from the warm air inside the outer heat insulator (29) in the first heat exchanger (31),
In the second heat exchanger (32), exhaust heat is recovered from the reformed gas in the reactor or the reformed gas flow path.

The reformer (13) is provided with a combustor (19), and the heat recovery heat exchanger (30) is provided with a third heat exchanger for recovering exhaust heat of the exhaust gas from the combustor (19). First heat exchanger, including a heat exchanger (33)
(31) and the third heat exchanger (33) may be connected to each other via a heat medium flow path (43) so that a predetermined heat medium flows. As a result, the heat medium is transferred to the first heat exchanger (31).
In (3), exhaust heat is recovered from warm air inside the outer heat insulating material (29), and exhaust heat is recovered from exhaust gas of the combustor (19) in the third heat exchanger (33).

In the fuel cell reforming system, the hot water tank (50) and the water in the hot water tank (50) are transferred between the hot water tank (50) and the heat recovery heat exchanger (30). A water circulation circuit (53) for circulation. As a result, the water in the hot water supply tank (50) is heated by the exhaust heat, and the exhaust heat of the reactor is effectively used as a heat source for the hot water supply.

The outer heat insulator (29) is provided so as to form a flow space (40) through which a heat medium for exhaust heat recovery flows between the outer heat insulator (29) and the inner heat insulator (9). The above outer insulation
(29) has an inlet (44) for the circulation space (40) for the heat medium.
And an outlet (45) may be formed. As a result, the outer heat insulating material (29) defines a circulation space (40) for the heat medium, and the outer heat insulating material (29) and the inner heat insulating material (9) form a heat exchange mechanism for heat recovery. You.

The fuel cell reforming system has a flow space in which a heat medium for exhaust heat recovery flows between the fuel cell and the outer heat insulating material (29).
A casing (46) that covers the outer heat insulating material (29) so as to form (47), wherein the casing (46) has an inlet (48) and an outlet of the flow space (47) for the heat medium. An outlet (49) may be formed. As a result, the heat medium circulation space (47) is defined by the casing (46),
The heat exchange mechanism for heat recovery is formed by (46) and the outer heat insulating material (29).

The heat medium may be air supplied to the fuel cell body (12). As a result, the exhaust heat of the reactor is used for preheating the air supplied to the fuel cell body (12),
Effective utilization of waste heat is achieved.

The heat recovery heat exchanger (30) may also serve as a heat radiating mechanism for releasing excess heat of the entire system.
As a result, the heat recovery heat exchanger (30) recovers the excess heat of the entire system together with the exhaust heat, so that a special heat radiation mechanism (radiator, heat radiation fan, etc.) for releasing the excess heat is used. No need to install.

[0026]

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

<Embodiment 1> As shown in FIG. 1, a fuel cell reforming system (11) according to this embodiment is a part of a fuel cell power generation system (10), The gas is reformed and supplied to the fuel cell body (12). The fuel cell reforming system (11) includes a desulfurizer (17), a reformer (13), a high-temperature transformer (14), a low-temperature transformer (15), a selective oxidizer (16), an air compressor ( 18) and a water tank (22).

The air compressor (18) compresses and supplies air from an air supply source (21), and includes a combustor (19) of a reformer (13) and a low-temperature transformer (15). The reformed gas flow path (42) between the selective oxidizer (16) and the fuel cell main body (12) are connected. The fuel cell body (12) is connected to the combustor (1) of the reformer (13).
9) and is configured to send exhaust gas to the reformer (13).

The desulfurizer (17) removes a sulfur component in the city gas sent from the city gas source (20), and is provided between the city gas source (20) and the reformer (13). Is provided.

The reformer (13) reacts city gas sent from the desulfurizer (17) with water sent from the water tank (22) while heating it in the combustor (19), and mainly produces carbon dioxide and hydrogen. And a reactor for producing a reformed gas containing: More specifically,
The reformer (13) converts the exhaust gas (anode exhaust gas containing hydrogen gas and the cathode exhaust gas containing steam and air) from the fuel cell body (12) and the compressed air sent from the air compressor (18). While mixing and burning in the combustor (19), the reformer
The desulfurized city gas and water are heated in the presence of a not-shown reforming catalyst provided in (13) to generate a reformed gas. Note that a third heat exchanger (33) for recovering heat of exhaust gas from the combustor (19) is connected to the combustor (19) of the reformer (13).

The high-temperature converter (14) and the low-temperature converter (15) are reactors for converting carbon monoxide in the reformed gas into carbon dioxide, and are connected via a reformed gas flow path (42). A reformer (13), a high-temperature converter (14), and a low-temperature converter (15) are provided in this order from the upstream side to the downstream side.

The selective oxidizer (16) is a reactor for further oxidizing the carbon monoxide in order to remove the carbon monoxide in the reformed gas, and comprises a low-temperature shift converter (15) and a fuel cell body (12). It is provided between.

The fuel cell main body (12) has a cathode (24) and an anode (23). The mixed gas of carbon dioxide and hydrogen sent from the selective oxidizer (16) and the air compressor (18) An electrode reaction for exchanging electrons between the anode (23) and the cathode (24) is performed by bonding with oxygen in the air sent from the air. Then, by changing the ions generated when hydrogen and oxygen are combined into charges of the cathode (24) and the anode (23),
Power is obtained. The water generated by this reaction is collected and supplied to the reformer (13). (25) is the fuel cell body
A cooler for cooling (12) and a radiator (26) for radiating cooling water are provided together with a water pump (not shown) so that water in the water tank (22) circulates through piping. It is connected.

A power supply mechanism (27) including a DC / DC converter and an inverter is connected to the fuel cell main body (12) to supply electric power generated in the fuel cell main body (12). . The power supply mechanism (27) is provided with a power supply line (28), and is configured to supply power through the power supply line (28).

Reformer (13), high temperature transformer (14), low temperature transformer
Each of the reactors (15) and the selective oxidizer (16) is covered with an inner heat insulating material (9) and arranged adjacent to each other. These reactors (13), (1
4), (15), and (16) are further entirely covered with an outer heat insulating material (29). In other words, the four reactors (13), (14), (15), (16) covered by the inner insulation (9) are covered by one outer insulation (29). Each inner insulation (9)
A predetermined gap is provided between the inner heat insulator (29) and the outer heat insulator (29). As a result, there is a space between the inner heat insulator (9) and the outer heat insulator (29) in which high-temperature warm air stays. (40) is formed. As the inner heat insulating material (9) or the outer heat insulating material (29), for example, a heat insulating material such as ceramic wool can be used.

Next, the operation of the fuel cell power generation system (10) will be described together with the operation of the fuel cell reforming system (11).

First, the sulfur component of the city gas is removed in the desulfurizer (17), and the city gas is sent to the reformer (13). In the reformer (13), the cathode exhaust gas and the anode exhaust gas from the fuel cell body (12) and the compressed air from the air compressor (18) are mixed, and heated and burned in the combustor (19).
Then, the city gas and water are heated and reacted in the presence of a catalyst (not shown) provided in the reformer (13), and a reformed gas mainly containing carbon dioxide and hydrogen is generated.

The reformed gas also contains carbon monoxide, as described above.
(14) and the low temperature transformer (15). Further, after oxidizing and removing carbon monoxide in the selective oxidizer (16), a mixed gas of carbon dioxide and hydrogen is supplied to the fuel cell body (12). In the fuel cell body (12), hydrogen sent from the selective oxidizer (16) and oxygen in the compressed air sent from the air compressor (18) are combined, and ions generated at that time are combined. Electric power is obtained by being converted into charges of the cathode (24) and the anode (23).

In the above operation, the temperatures of the reformer (13), the high-temperature transformer (14), the low-temperature transformer (15), and the selective oxidizer (16) are:
About 800 ° C, about 400 ° C, about 200 ° C,
The temperature rises to about 150 ° C. Therefore, these reactors (1
3), (14), (15), and (16) release heat to the outside. However, each reactor (13), (14), (15), (16)
Is covered with inner insulation (9), so each reactor (13),
The heat radiation of (14), (15) and (16) decreases. Further, since the outer heat insulator (29) is provided outside the inner heat insulator (9), the amount of heat released to the outside of the outer heat insulator (29) is extremely small.

In particular, in the present system (10), the inner insulating material
Since a space (40) is formed between (9) and the outer heat insulating material (29), the air in the space (40) flows into each of the reactors (13), (14), (1).
5) The temperature rises due to heat radiation from (16). Therefore, the temperature difference between each reactor (13), (14), (15), (16) and the air in the space (40) is smaller than when the outer heat insulating material (29) is not provided. The amount of heat released from the reactors (13), (14), (15), and (16) through the inner heat insulator (9) to the air in the space (40) is extremely small. Therefore, reactors (13), (14), (1
5) and (16) reduce the heat loss.

-Modifications- In the above embodiment, all the reactors (13), (14), (15), (16)
Was provided with an inner insulating material (9),
It is not necessary to provide (9) in all the reactors (13), (14), (15), and (16); the reformer (13), the high-temperature transformer (14), and the low-temperature
5) Only the first to third reactors of the selective oxidizer (16) may be covered with the inner heat insulating material (9).

Further, all the reactors (13), (14), (15), (1
6) need not be accommodated in the outer heat insulator (29), and only two or three reactors may be provided inside the outer heat insulator (29).

As shown in FIG. 2, in addition to the reformer (13), the high-temperature shifter (14), the low-temperature shifter (15) and the selective oxidizer (16),
The water tank (22) may also be provided inside the outer heat insulating material (29). Thereby, the heat loss of the water tank (22) can be reduced.

As shown in FIG. 3, the reformer (13) and the high-temperature shifter (14) may be integrated. In other words, instead of the individually formed reformer (13) and the high-temperature shifter (14), the reformer (1)
A reactor (41) in which 3) and the high-temperature converter (14) are integrated may be provided. In this case, the reactor (41)
What is necessary is just to provide the inner heat insulating material (9) which integrally covers (41).

<Embodiment 2> The fuel cell reforming system (11) according to Embodiment 2 is provided with a heat recovery heat exchanger (30) inside or inside an outer heat insulator (29).

As shown in FIG. 4, in the present embodiment, the second heat exchanger (3) is used as the heat recovery heat exchanger (30) in the high-temperature transformer (14).
2) is provided. Thereby, the exhaust heat of the high-temperature converter (14) can be directly recovered via the second heat exchanger (32). Further, by adjusting the heat exchange amount of the second heat exchanger (32), the reaction temperature of the high-temperature transformer (14) can be adjusted. That is, the second heat exchanger (32) is connected to the high-temperature transformer (1).
It also plays the role of regulating the reaction temperature of 4).

It should be noted that the second heat exchanger (32) may be provided in the reformer (13), the low-temperature shift converter (15) or the selective oxidizer (16) based on the temperature level of each reactor. Of course. Also,
Instead of providing the second heat exchanger (32) directly in the reactor, the second heat exchanger (32) may be provided in a reformed gas channel (42) (see FIG. 1; not shown in FIG. 4) between the reactors.

As shown in FIG. 5, a third heat exchanger (33) for recovering exhaust heat from the exhaust gas of the reformer (13) is provided inside the outer heat insulating material (29). Is also good.

As shown in FIG. 6, a first heat exchanger as a heat recovery heat exchanger (30) is provided in a space (40) formed between the inner heat insulator (9) and the outer heat insulator (29). (31) may be provided. That is, heat may be recovered from the warm air in the space (40).

As shown in FIG. 7, the outer heat insulating material (29)
The fourth heat exchanger (34) as a heat recovery heat exchanger (30) inside
May be embedded. In other words, heat may be recovered from the outer heat insulating material (29).

As shown in FIG. 8, the outer heat insulating material (29)
A first heat exchanger (31) and a second heat exchanger (32) are provided inside the heat exchanger, and these two heat exchangers (31) and (32) are connected to a heat medium flow pipe.
They may be connected to each other via (43).

As shown in FIG. 9, the outer heat insulating material (29)
A first heat exchanger (31) and a third heat exchanger (33) are provided inside the heat exchanger, and these two heat exchangers (31) and (33) are connected to a heat medium flow pipe.
They may be connected to each other via (43).

The heat recovery heat exchanger (30) may be constituted by a plate heat exchanger as shown in FIG. Thereby, the heat recovery heat exchanger (30) can be reduced in size, and the entire system (11) can be reduced in size. Further, as shown in FIG. 11, a heat recovery heat exchanger (30) is provided with a heat transfer tube (36) disposed so as to be in direct contact with the reactors (13), (14), (15), and (16). ).
As shown in FIG. 11, the heat transfer tube (36) is connected to all the reactors (1).
3), (14), (15), and (16) may be arranged so as to be wound integrally, and each reactor (13), (14), (15), (16) It may be wound. By circulating a heat medium such as water inside the heat transfer tube (36), exhaust heat can be recovered by the heat medium.

Further, by adjusting the temperature and the flow rate of the heat medium flowing through the heat recovery heat exchanger (30),
It is possible to adjust the heat exchange amount in (30). Therefore, by adjusting the heat exchange amount of the heat recovery heat exchanger (30) in accordance with the total surplus heat amount of the system (10), the heat recovery heat exchanger (30) is dissipated by the entire heat dissipation mechanism of the system (10). Can be used as That is, the heat recovery heat exchanger (30) can be used also as the heat radiation mechanism of the system.

<Third Embodiment> As shown in FIG. 12, in the third embodiment, an inlet (44) and an outlet (45) for the heat medium are formed in the outer heat insulator (29), and the outer heat insulator (29) is formed. The space (40) between the inner heat insulating material (9) and the inner heat insulating material (9) is used as a heat medium circulation space.
In other words, in this embodiment, a heat exchange mechanism for heat recovery is formed by the outer heat insulator (29) and the inner heat insulator (9). The heat medium flows into the circulation space (40) from the inflow port (44) and recovers heat leaking from the inner heat insulating material (9). The heat medium from which heat has been recovered flows out of the circulation space (40) through the outlet (45). Here, air is used as the heat medium, but the fluid as the heat medium is not limited to air, but may be another fluid. If the air supplied from the air compressor (18) to the fuel cell body (12) is used as a heat medium, the exhaust heat of the reactors (13), (14), (15), (16) can be reduced. It can be used for preheating the supply air and is particularly suitable.

<Fourth Embodiment> As shown in FIG. 13, in a fourth embodiment, an outer heat insulating material (29) is covered with a casing (46), and a space between the casing (46) and the outer heat insulating material (29) is provided. The space (47) is used as a heat medium circulation space. The casing (46) has an inlet (48) and an outlet (49) for the heat medium. The heat medium flowing from the inflow port (48) exchanges heat with the outer heat insulator (29), and recovers heat leaking from the outer heat insulator (29) in the flow space (47). Then, the heat medium that has recovered the heat leaking from the outer heat insulating material (29) flows out from the outlet (49).
In this way, the exhaust heat of the reactors (13), (14), (15), (16) is recovered.

<Fifth Embodiment> As shown in FIG. 14, in the fifth embodiment, waste heat recovered by the heat recovery heat exchanger (30) is used as a heat source for hot water supply.

In the fifth embodiment, a water circulation circuit (53) is formed by connecting a hot water supply tank (50), a circulation pump (51) and a heat recovery heat exchanger (30) in this order. In other words, the heat recovery heat exchanger
(30) is configured to heat the water in the hot water supply tank (50) by exhaust heat. This allows the heat recovery heat exchanger (30)
In this case, the circulating water is heated, hot water is stored in the hot water supply tank (50), and the exhaust heat is effectively used as a heat source for hot water supply.

<Other Embodiments> The reformer (13)
Is not limited to a reformer that performs steam reforming, but may be a reformer that performs partial oxidation reforming.

The transformers are a high-temperature transformer (14) and a low-temperature transformer (15).
The transformer is not limited to the two-stage transformer and may be a single-stage transformer or a transformer having three or more stages.

[0061]

As described above, according to the present invention, at least two reactors are respectively covered with the inner heat insulating material, and the whole thereof is further integrally covered with the outer heat insulating material. Heat loss can be reduced. Further, a space can be secured between the inner heat insulating material and the outer heat insulating material, and equipment for exhaust heat recovery can be easily installed by using this space.

By integrating at least two of the reactors covered with the outer heat insulating material, the system can be miniaturized and the heat loss can be further reduced.

By providing a tank for storing the reforming water inside the outer heat insulating material, the heat loss of the tank can be reduced.

By providing the heat recovery heat exchanger inside or inside the outer heat insulating material, it is possible to effectively use the exhaust heat.

By using a plate heat exchanger as the heat recovery heat exchanger, it is possible to reduce the size of the entire system and to improve the efficiency of recovering exhaust heat.

By using a heat transfer tube as the heat recovery heat exchanger, the heat recovery heat exchanger can be realized with a simple and inexpensive configuration.

By providing a water circulation circuit for circulating water between the hot water supply tank and the heat recovery heat exchanger, waste heat recovered by the heat recovery heat exchanger can be used for hot water supply.

By forming a flow space for the heat medium between the outer heat insulator and the inner heat insulator, a heat exchange mechanism for heat recovery can be constituted by the outer heat insulator and the inner heat insulator.

By providing a casing for covering the outer heat insulating material and forming a heat medium circulation space between the casing and the outer heat insulating material, a heat exchange mechanism for heat recovery is constituted by the outer heat insulating material and the casing. be able to.

By utilizing the air supplied to the fuel cell body as a heat medium, the air can be preheated by utilizing the exhaust heat of the reactor.

By using the heat recovery heat exchanger as a heat radiating mechanism for releasing the excess heat of the entire system, a special heat radiating mechanism for releasing the excess heat can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a device configuration of a fuel cell power generation system according to a first embodiment.

FIG. 2 is a block diagram of a part of the fuel cell reforming system according to the first embodiment.

FIG. 3 is a diagram corresponding to FIG. 2 according to a modification of the first embodiment.

FIG. 4 is a diagram corresponding to FIG. 2 according to the second embodiment.

FIG. 5 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 6 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 7 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 8 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 9 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 10 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 11 is a diagram corresponding to FIG. 2 according to a modification of the second embodiment.

FIG. 12 is a diagram corresponding to FIG. 2 according to the third embodiment.

FIG. 13 is a diagram corresponding to FIG. 2 according to the fourth embodiment.

FIG. 14 is a block diagram of a part of a fuel cell reforming system according to a fifth embodiment.

FIG. 15 is a block diagram showing a device configuration of a conventional fuel cell power generation system.

[Explanation of symbols]

 (9) Inner insulation material (12) Fuel cell body (13) Reformer (14) High temperature transformer (15) Low temperature transformer (16) Selective oxidizer (17) Desulfurizer (18) Air compressor (19) Combustor (20) City gas supply (21) Air supply (22) Water tank (29) Outer insulation

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shuji Ikegami 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Sakai Seisakusho Kanaoka Factory F-term (reference) 5H027 AA06 BA01 BA09 BA16 BA17 DD06

Claims (17)

[Claims] 1. A fuel cell reforming system comprising at least three reactors including a reformer (13), a transformer (14, 15), and a selective oxidizer (16), wherein at least two reactors are provided. A fuel comprising: an inner insulating material (9) covering each of the reactors; and an outer insulating material (29) integrally covering at least two reactors including the reactor covered by the inner insulating material (9). Battery reforming system. 2. The fuel cell according to claim 1, wherein at least two of the reactors covered by the outer insulation (29) are integrated with one another and covered by one inner insulation (9). For reforming system. 3. A tank (22) for storing reforming water is provided inside the outer heat insulating material (29).
Or the reforming system for a fuel cell according to any one of 2. 4. Inside or inside the outer insulation (29),
The fuel cell reformer according to any one of claims 1 to 3, further comprising a heat recovery heat exchanger (30) for recovering exhaust heat of the reactor (13, 14, 15, 16). system. 5. The heat recovery heat exchanger (30) includes an inner heat insulator (9).
5. The fuel cell reforming system according to claim 4, further comprising a first heat exchanger (31) provided outside and inside the outside heat insulator (29). 6. 6. The heat recovery heat exchanger (30) includes an outer heat insulating material (29).
A second heat exchanger (32) provided in at least one of the reactors covered by or in the reformed gas flow path (42) between the reactors covered by the outer heat insulator (29). Claim 4 or 5
The fuel cell reforming system according to any one of the above. 7. A reformer (13) is provided with a combustor (19), and a heat recovery heat exchanger (30) is a third heat recovery heat exchanger for recovering exhaust heat of exhaust gas from the combustor (19). The reforming system for a fuel cell according to any one of claims 4 to 6, further comprising a heat exchanger (33). 8. The heat recovery heat exchanger (30) includes an outer heat insulating material (29).
And a fourth heat exchanger (34) embedded in the housing.
8. The reforming system for a fuel cell according to any one of items 7 to 7. 9. The fuel cell reforming system according to claim 4, wherein the heat recovery heat exchanger (30) includes a plate heat exchanger (35). 10. The heat recovery heat exchanger (30) comprises a reactor (13,1).
Heat transfer tubes (36) arranged to directly contact
The reforming system for a fuel cell according to any one of claims 4 to 9, comprising: 11. The heat recovery heat exchanger (30) includes an outer heat insulator (2).
A second heat exchanger (32) provided in at least one of the reactors covered by 9) or in the reformed gas flow path (42) between the reactors covered by the outer insulation (29) The first heat exchanger (31) and the second heat exchanger (32) are connected to each other via a heat medium flow path (43) so that a predetermined heat medium flows. 6. The reforming system for a fuel cell according to 5. 12. The reformer (13) is provided with a combustor (19), and the heat recovery heat exchanger (30) is provided with a third gas for recovering exhaust heat of the exhaust gas from the combustor (19). The first heat exchanger (31) and the third heat exchanger (33) include a heat exchanger (33). The first heat exchanger (31) and the third heat exchanger (33) are mutually connected via a heat medium flow path (43) so that a predetermined heat medium flows. The fuel cell reforming system according to claim 5, which is connected. 13. A hot water supply tank (50), and a water circulation circuit (53) for circulating water in the hot water supply tank (50) between the hot water supply tank (50) and the heat recovery heat exchanger (30). The fuel cell reforming system according to any one of claims 4 to 12, comprising: 14. The outer heat insulating material (29), wherein the outer heat insulating material (29)
The heat insulating medium for exhaust heat recovery is provided so as to form a flow space (40) between the heat insulating medium and the inner heat insulating material (9). Inlet of space (40)
The fuel cell reforming system according to any one of claims 1 to 3, wherein the (44) and the outlet (45) are formed. 15. A casing (46) for covering the outer heat insulating material (29) so as to form a flow space (47) through which a heat medium for exhaust heat recovery flows between the outer heat insulating material (29) and the outer heat insulating material (29). The casing (46) is provided in the circulation space (4
The reforming system for a fuel cell according to any one of claims 1 to 3, wherein the inlet (48) and the outlet (49) of (7) are formed. 16. The fuel cell reforming system according to claim 14, wherein the heat medium is air supplied to the fuel cell main body (12). 17. The reformer for a fuel cell according to claim 4, wherein the heat recovery heat exchanger (30) also functions as a heat radiating mechanism for releasing excess heat of the entire system. system.