JPH0664901A - Co convertor for fuel cell generating set - Google Patents

Abstract

PURPOSE:To miniaturize a CO convertor for a fuel cell generating set by dividing the inside of a vessel and monolithically forming the first CO convertor, an intermediate cooler and the second CO convertor so that the respective units may mutually communicate with each other. CONSTITUTION:Ceramic balls are packed in the upper part of an opening 25a in the first CO convertor 21 so as to constitute a catalyst support 31. A specified amount of a catalyst is packed thereon to constitute a catalyst bed 33 and a catalyst support 32 is placed thereon. In the second CO transformer 23, a catalyst support 34 is placed directly above a connection port of a reformed gas outlet duct 30 and a catalyst bed 36 is formed thereon. A catalyst support 35 is placed thereon and many openings 25a for allowing the first CO transformer 21 to communicate with an intermediate cooler 22 are made in the lower part wall of an inner cylinder 25. An opening 27 for allowing the intermediate cooler 22 to communicate with the second CO transformer 23 is made between the upper end part of an outer cylinder 26 and the top board 24b. A reformed gas 19 is allowed to generate heat in the catalyst bed 33 and CO and H2O are converted to CO2 and H2. Further, the residual CO is converted to CO2 and H2 after cooling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a C for fuel cell power generator.
The present invention relates to an O-transformer, and more particularly to a CO-transformer for a fuel cell power generator that causes carbon monoxide in the reformed gas from the reformer to react with steam.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of a conventional phosphoric acid fuel cell power generator. In FIG. 3, the reformer 1 reacts fuel with steam to generate reformed gas. The reformed gas undergoes heat exchange with the fuel in the heat exchangers 2 and 3 to preheat the fuel, and then carbon monoxide contained in the reformed gas is reacted with steam to generate hydrogen and dioxide. It is sent to the CO transformer 4 for conversion into carbon.

The CO transformer 4 comprises a first CO transformer 10, intercoolers 12 and 13, and a second CO transformer 11. In the first CO shift converter 10, carbon monoxide contained in the reformed gas from the reformer 1 is reacted with steam to be converted into hydrogen and carbon dioxide to be the first reformed gas. Since the reaction in the first CO shift converter 10 is an exothermic reaction, the temperature of the first reformed gas discharged from the first CO shift converter 10 is higher than the temperature of the reformed gas supplied from the reformer 1. ing. This first CO treatment gas is sent to the next second CO shift converter 11 before being transferred to the intercoolers 12, 13
And is cooled to a predetermined temperature suitable for the reaction in the second CO shift converter 11 to become a cooling process gas. This cooling processing gas is sent to the second CO shift converter 11. In the second CO shift converter 11, carbon monoxide remaining in the cooling treatment gas is reacted with water vapor to be converted into hydrogen and carbon dioxide to be a second reformed gas. This second reformed gas is supplied to the phosphoric acid fuel cell 5 via the heat exchangers 14, 15 and 16.

[0004]

However, the conventional C
Since the O-transformer 4 is composed of the first CO transformer 10, the intercoolers 12, 13 and the second CO transformer 11, each of which is configured separately and independently, the O-transformer 4 becomes large and the fuel incorporating the CO transformer 4 is increased. There is a problem that the battery power generator becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a compact CO transformer for a fuel cell power generator capable of downsizing the fuel cell power generator.

[0006]

In order to achieve the above object, a CO transformer for a fuel cell power generator according to the present invention is modified from a fuel by a reformer by partitioning the inside of a sealed container. A first CO shifter for reacting carbon monoxide in a gaseous substance with water vapor to form a first CO treatment gas; an intercooler for sending a refrigerant to cool the first CO treatment gas into a cooling treatment gas; A second CO in which carbon monoxide in the treated gas is reacted with steam to form a second CO treated gas
It is characterized in that the transformer and the transformer are integrally formed in a communicating state.

[0007]

Since the CO transformer for the fuel cell power generator is formed integrally by partitioning the interior of the container with the first CO transformer, the intercooler and the second CO transformer, it can be made compact. Therefore, the fuel cell power generator can be downsized.

[0008]

EXAMPLE An example of a CO shifter (carbon monoxide shifter) for a fuel cell power generator according to the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 2 shows a schematic structure of a phosphoric acid fuel cell power generator to which the CO converter 20 of this embodiment is applied. In the reformer 1, the fuel and the steam are reacted to generate a reformed gas. The reformed gas from the reformer 1 is sent to the heat exchangers 2 and 3 in order to cool it to the operating temperature of the CO shift converter 20, and the heat exchangers 2 and 3 exchange heat with the fuel. The reformed gas cooled by the heat exchangers 2 and 3 is sent to the CO shift converter 20. In the CO shift converter 20, carbon monoxide contained in the reformed gas reacts with steam to convert it into hydrogen and carbon dioxide. The reformed gas discharged from the CO shift converter 20 is supplied to the fuel electrode 5a of the fuel cell 5 and chemically reacts with the oxidizing gas supplied to the air electrode 5b to generate electric power. In FIG. 2, reference numeral 6 is a steam separator, and reference numeral 8
Is a desulfurizer, and 9 is a DC / AC converter.

Next, the CO transformer 20 of this embodiment will be described in detail with reference to FIG. Note that description of well-known parts will be omitted.

As shown in FIG. 1, a carbon monoxide in the reformed gas 19 obtained from the fuel by the reformer 1 is reacted with water vapor to form a first CO treated gas 19a, and a first CO converter 21 is provided. An intercooler 22 for cooling the 1CO processing gas 19a into a cooling processing gas 19b, and a cooling processing gas 19b
Carbon monoxide therein is reacted with water vapor to form the second CO treatment gas 19c hydrogen and the second CO shifter 23 integrally by partitioning the inside of the container 24.

The container 24 is composed of a cylindrical body plate 24a, a top plate 24b and a bottom plate 24c. At the center of the container 24, a cylindrical inner cylinder 25 is erected from the bottom plate 24c and extends to the top plate 24b. The inner cylinder 25, the top plate 24b, and the bottom plate 24c form the first CO transformer 21. . The top plate 24b is provided with a gas inlet 21a,
The reformed gas is sent from the outside of the container 24 through the gas inlet 21a. In the lower part of the inner cylinder 25 near the top plate 24b, a large number of small openings 25a for connecting the first CO shifter 21 and the intercooler 22 are provided.

An outer cylinder 26 is erected from the bottom plate 24c outside the inner cylinder 25 with a space therebetween. Between the upper end of the outer cylinder 26 and the top plate 24b, the intercooler 22 and the second C
An opening 27 communicating with the O-transformer 23 is formed.

The space between the inner cylinder 25 and the outer cylinder 26 is the intercooler 2.
It is 2. That is, in the space sandwiched by the inner cylinder 25 and the outer cylinder 26, the winding portion 29c of the heat guide tube 29 for circulating the cooling water 28 is spirally wound. An inlet end 29a of the heat guide tube 29 is provided at an upper portion of the body plate 24a and is connected to the winding portion 29c through a connecting pipe, and the outlet end 2
9b is provided on the upper part of the body plate 24a, and is connected to the winding part 29c through a connecting pipe.

The second CO transformer 23 includes a body plate 24a,
The outer cylinder 26, the top plate 24b, and the bottom plate 24c are partitioned and formed. A reformed gas outlet duct 30 for discharging the second CO treatment gas 19c is provided on the lower outside of the body plate 24a.

A catalyst support 31 filled with ceramic balls is provided immediately above the opening 25a in the first CO shift converter 21. The catalyst support 31 is filled with a prescribed amount of catalyst to form a first CO shift converter catalyst bed 33. A catalyst support 32 is provided on the first CO shift converter catalyst bed 33.

In the second CO shift converter 23, the catalyst support 3 is provided just above the connection port of the reformed gas outlet duct 30.
4 is provided, and the catalyst support 34 is filled with a prescribed amount of catalyst to form a second CO shift converter catalyst bed 36. A catalyst support 3 is provided on the catalyst bed 36 of the second CO shift converter.
5 are provided.

Next, the operation of this embodiment will be described. The reformed gas 19 that has passed through the heat exchanger 3 is introduced into the first CO shift converter 21 from the gas inlet 21a.

The reformed gas 19 reacts exothermically under the catalyst in the first CO shift converter catalyst bed 33, and carbon monoxide in the reformed gas 19 is shown in the formula (1) together with the steam in the reformed gas 19. It reacts according to the reaction formula to become carbon dioxide and hydrogen.

CO + H ₂ O → CO ₂ + H ₂ (1) Then, the reformed gas 19 passes through the first CO shift converter 21 to become the first CO treatment gas 19a having a temperature of about 240 ° C., and then from the opening 25a to the intercooler 22. enter.

In the intercooler 22, the pump 7 is operated at about 1
Cooling water having a temperature of 75 ° C. is pressure-fed to the electric heating pipe 29. The cooling water that has passed through the electric heating pipe 29 returns to the water vapor separator 6. The cooling capacity of the intercooler 22 is determined by the temperature of the cooling water and the length of the heat conducting tube 29, and this cooling capacity depends on the reformed gas outlet duct 30.
The second CO treatment gas 19c discharged from the tank is adjusted to a predetermined temperature.

On the other hand, the first CO treatment gas 19a passes upward through the intercooler 22 to become the cooling treatment gas 19b having a temperature of about 180 ° C. to 190 ° C., and enters the second CO shift converter 23 through the opening 27. The cooling treatment gas 19b undergoes an exothermic reaction under the catalyst in the second CO shift converter catalyst bed 36, and the cooling treatment gas 19b
The carbon monoxide remaining in b becomes carbon dioxide and hydrogen according to the reaction formula shown in Formula (1).

The first CO treatment gas 19a passes through the second CO shift converter 23 and the second CO treatment gas 1 having a temperature of about 200.degree.
9c and is sent from the reformed gas outlet duct 30 to the outside of the container 21. Unlike the conventional case shown in FIG. 3, the second CO treatment gas 19c from the reformed gas outlet duct 30 is different from that shown in FIG.
It is directly sent to the phosphoric acid fuel cell 5 without passing through the heat exchangers 14, 15 and 16 in FIG.

As described above, according to the configuration of this embodiment, the interior of the container 24 is partitioned so that the first CO transformer 21, the intercooler 22, and the second CO transformer 23 are in communication with each other. Since it is formed integrally, the CO transformer 20 for the phosphoric acid fuel cell power generator can be made compact. Moreover, the number of independent devices can be reduced, and the number of pipes connecting the respective devices can be reduced. As a result, the fuel cell power generator incorporating the CO transformer 20 can be downsized.

In addition, the second gas from the reformed gas outlet duct 30
Since the cooling capacity of the intercooler 22 can be set so that the temperature of the CO treatment gas 19c becomes a predetermined optimum temperature, the heat exchangers 14, 15 in FIG. 3 connected to the conventional CO shifter, 16 can be omitted.

In the present embodiment, the first CO transformer 21 is provided at the center of the container 24 and the second CO transformer 23 is provided as the first CO transformer 23.
Although the case where it is provided outside the CO transformer 21 is shown, the present invention is not limited to this, and the second CO transformer may be provided in the center of the container 24 and the first CO transformer may be provided outside the second CO transformer. .

Further, in the present embodiment, an example in which the inside of the container 24 is partitioned coaxially by the cylindrical inner cylinder 25 and the outer cylinder 26 is shown, but the inner cylinder 25 and the outer cylinder 26 are coaxial. It doesn't have to be.

Further, in the present embodiment, an example in which the inside of the container 24 is partitioned by the cylindrical inner cylinder 25 and the outer cylinder 26 is shown, but it is not necessary that the container 24 is cylindrical, and for example, it is partitioned by a rectangular parallelepiped. Good.

[0029]

As described above, according to the present invention,
By partitioning the inside of the container, the first CO transformer, the intercooler, and the second CO transformer are integrally formed in a communicating state, so that the CO transformer for the fuel cell power generator can be made compact. it can. As a result, the fuel cell power generator incorporating the CO transformer can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a CO transformer for a fuel cell power generator according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of a fuel cell power generation device incorporating an embodiment of a CO transformer for a fuel cell power generation device according to the present invention.

FIG. 3 is a diagram showing a schematic configuration of a fuel cell power generator incorporating a conventional CO transformer for a fuel cell power generator.

[Explanation of symbols]

 1 reformer 2 heat exchanger 3 heat exchanger 4 conventional CO shifter 5 fuel cell 6 steam separator 7 pump 8 desulfurizer 9 orthogonal converter 10 first CO shifter 11 second CO shifter 12 intercooler 13 intermediate Cooler 14 Heat exchanger 15 Heat exchanger 16 Heat exchanger 19 Reformed gas 19a First CO treatment gas 19b Cooling treatment gas 19c Second CO treatment gas 20 CO shifter 21 First CO shifter 21a Gas inlet 22 Intercooler 23th 2CO shifter 24 Container 24a Body plate 24 24b Top plate 24 24c Bottom plate 24 25 Inner cylinder 26 Outer cylinder 27 Opening 28 Cooling water 29 Heat transfer tube 29a Inlet end 29b Outlet end 30 Reformed gas outlet duct 31 Catalyst support 32 Catalyst support 33 No. 1 CO shift converter catalyst bed 34 Catalyst support 35 Catalyst support 36 2nd CO shift converter catalyst bed

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[Procedure amendment]

[Submission date] October 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

As shown in FIG. 1, a carbon monoxide in the reformed gas 19 obtained from the fuel by the reformer 1 is reacted with water vapor to form a first CO treated gas 19a, and a first CO converter 21 is provided. An intercooler 22 for cooling the 1CO processing gas 19a into a cooling processing gas 19b, and a cooling processing gas 19b
The inside of the container 24 is integrally formed with the second CO shifter 23 that reacts the carbon monoxide in the inside with the steam to generate the second CO treatment gas 19c.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The container 24 is composed of a cylindrical body plate 24a, a top plate 24b and a bottom plate 24c. At the center of the container 24, a cylindrical inner cylinder 25 is erected from the bottom plate 24c and extends to the top plate 24b. The inner cylinder 25, the top plate 24b, and the bottom plate 24c form the first CO transformer 21. . The top plate 24b is provided with a gas inlet 21a,
The reformed gas is sent from the outside of the container 24 through the gas inlet 21a. In the lower part of the inner cylinder 25 near the bottom plate 24c, a large number of small openings 25a that connect the first CO shift converter 21 and the intercooler 22 are provided.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The space between the inner cylinder 25 and the outer cylinder 26 is the intercooler 2.
It is 2. That is, the winding portion 29c of the heat transfer tube 29 for circulating the cooling water 28 is spirally wound in the space sandwiched by the inner cylinder 25 and the outer cylinder 26. An inlet end 29a of the heat transfer tube 29 is provided at an upper portion of the body plate 24a and is connected to the winding portion 29c via a connecting pipe, and the outlet end 2
9b is provided in the lower part of the body plate 24a, and is connected to the winding part 29c through a connecting pipe.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

In the intercooler 22, the pump 7 is operated at about 1
Cooling water having a temperature of 75 ° C. is pumped to the heat transfer tube 29. The cooling water that has passed through the heat transfer tube 29 returns to the water vapor separator 6. The cooling capacity of the intercooler 22 is determined by the temperature of the cooling water and the length of the heat transfer tube 29, and this cooling capacity is determined by the reformed gas outlet duct 30.
The second CO treatment gas 19c discharged from the tank is adjusted to a predetermined temperature.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 1 reformer 2 heat exchanger 3 heat exchanger 4 conventional CO shifter 5 fuel cell 6 steam separator 7 pump 8 desulfurizer 9 orthogonal converter 10 first CO shifter 11 second CO shifter 12 Intercooler 13 Intercooler 14 Heat exchanger 15 Heat exchanger 16 Heat exchanger 19 Reformed gas 19a First CO treatment gas 19b Cooling treatment gas 19c Second CO treatment gas 20 CO shifter 21 First CO shifter 21a Gas inlet 22 Intercooler 23 Second CO shifter 24 Container 24a Body plate 24 24b Top plate 24 24c Bottom plate 24 25 Inner cylinder 26 Outer cylinder 27 Opening 28 Cooling water 29 Heat transfer tube 29a Inlet end 29b Outlet end 30 Reformed gas outlet duct 31 Catalyst support 32 catalyst support 33 first CO shift converter catalyst bed 34 catalyst support 35 catalyst support 36 second CO shift Vessel catalyst bed

Claims (2)

[Claims] 1. A first C process for dividing carbon monoxide in a reformed gas obtained from a fuel by a reformer with steam to form a first CO treated gas by partitioning the inside of a closed container.
An O-transformer, an intercooler that sends a refrigerant to cool the first CO treatment gas into a cooling treatment gas, and a carbon monoxide in the cooling treatment gas to react with steam to produce a second CO treatment gas A CO transformer for a fuel cell power generator, which is formed integrally with a 2CO transformer in a communication state. 2. One of the first CO shifter and the second CO shifter is sectioned and formed in a central portion of the container, and the other is sectioned and formed in an outer portion inside the container, and the first CO transformer is formed.
The CO transformer for a fuel cell power generator according to claim 1, wherein the intercooler is partitioned between the transformer and the second CO transformer.