JP2007087756A - Solid oxide fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid oxide fuel cell in which mass flow rate to fuel cells is adjusted, deterioration of fuel cells is prevented, and high power operation is maintained. <P>SOLUTION: The solid oxide fuel cell comprises cylindrical fuel cells 1, a power generation chamber 8 equipped with a plurality of the cylindrical fuel cells, and a fuel dispersing chamber 11 which supplies fuel in the state of dispersion to the power generation chamber, and the fuel dispersing chamber comprises an adjusting part 25 with temperature distribution. The adjusting part has heat-exchanging units 24 for cooling. Air or water is used for a cooling medium sent to the heat-exchanging units. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solid oxide fuel cell, and in particular, a solid oxide fuel cell having a fuel cell, a power generation chamber containing a plurality of fuel cells, and a fuel dispersion chamber located below the power generation chamber. It is invention regarding.

A solid oxide fuel cell is a type of fuel cell that is made by laminating ceramic materials of different components as an air electrode, an electrolyte, and a fuel electrode, and generates electricity most efficiently at about 700 ° C to 1000 ° C. In particular, a fuel cell having a cylindrical shape is called a cylindrical solid oxide fuel cell.
An example of a conventional typical cylindrical solid oxide fuel cell is shown in FIG. A plurality of cylindrical fuel cells 1 are housed inside the metal wall 4 with the sealing end facing downward, and the insulating wall 3 is disposed between the fuel cell 1 located on the outermost periphery and the metal wall 4. is doing. The plurality of fuel cells 1 are electrically connected by a current collector 2 and exhibit a predetermined electric capacity. A partition plate 7 is attached in the vicinity of the opening of the fuel cell 1, and the sealing end side of the fuel cell 1 from the partition plate 7 is a power generation chamber 8, and the fuel cell 1 opening side is a combustion chamber 9. The fuel gas supplied through the fuel supply pipe 14 is effectively dispersed in the fuel dispersion chamber 11 located below the fuel cell 1, enters the power generation chamber 8 from the fuel dispersion plate 16, and moves toward the upper partition plate 7. It contacts the outer surface of each fuel cell 1 while flowing. On the other hand, air is supplied from the air supply pipe 15 to the air distributor 6, where it is effectively dispersed, and air is introduced through the introduction pipe 5 inserted inside the fuel battery cell 1, and the inner surface of the fuel battery cell 1. To touch. When the operating temperature of the solid oxide fuel cell configured as described above is raised from about 700 ° C. to 1000 ° C., O ² flows from the air electrode inside the fuel cell 1 to the fuel electrode outside the fuel cell 1. ^- ions to move electrochemical reaction takes place, generating electricity. Water vapor and unreacted fuel gas generated during power generation pass through a partition plate 7 having an appropriate pressure loss and ventilation function and enter the combustion chamber 9, where unreacted residue remains inside the fuel cell 1. It is mixed with air and discharged from the exhaust gas duct 10 after ignition and combustion. Since the partition plate 7 has an appropriate pressure loss, the gas in the combustion chamber 9 is prevented from flowing back to the power generation chamber 8. A heat insulating material 17 is disposed on the outer periphery of the metal wall 4 so that the temperature in the power generation chamber 8 can be maintained at a high temperature, and energy loss due to heat dissipation is prevented.

  In the configuration of such a conventional solid oxide fuel cell, the fuel cell 1 and the introduction pipe 5, the insulating wall 3, and the fuel dispersion plate 16 are ceramic materials, the metal wall 4, the fuel supply pipe 14, the exhaust gas duct 10, and the like. In general, the piping and the air distributor 6 are made of heat-resistant metal material such as Inconel or stainless steel or nickel, and the partition plate 7 is made of ceramic material such as alumina fiber.

The voltage of the solid oxide fuel cell is strongly influenced by the mass flow rate of the fuel supplied to the fuel cell 1. If the mass flow rate of the fuel is small, the replenishment will be delayed with respect to the consumption of the fuel at the electrode, and a phenomenon in which the voltage drops (= concentration overvoltage) occurs because energy is consumed for the diffusion of the fuel.
The state where the voltage is decreasing is a state where a burden is applied to the fuel battery cell 1, and generally indicates that the deterioration of the fuel battery cell is proceeding.
Therefore, in the solid oxide fuel cell, it is desirable that the same mass flow rate is supplied to all the fuel cells 1 as the fuel. However, in reality, a temperature distribution in the power generation chamber 8 due to heat radiation from the metal wall 4 located on the outer periphery of the power generation chamber 8 and a temperature distribution due to individual differences in the calorific value of the cell occur, and the fuel density is increased due to thermal expansion at high temperatures. And the mass flow rate of the fuel is smaller than that at a relatively low temperature. Also, uneven fuel dispersion due to structural or constructional variations can occur. In this case, the voltage of the fuel cell 1 in the portion where the mass flow rate of the supplied fuel is small is relatively lowered, and the fuel cell 1 is rapidly deteriorated, and in the worst case, it is damaged. In general, when operating a solid oxide fuel cell, in order to avoid abrupt deterioration or breakage of the fuel cell 1, the overall power generation output or power generation efficiency must be reduced according to the fuel cell 1 having the lowest voltage. I don't get it.

In conventional solid oxide fuel cells, proposals have been made to uniformly disperse fuel. For example, the fuel dispersion chamber 11 located below the power generation chamber 8 is filled with ceramic balls as the fuel dispersion material 12 or is porous, and the fuel is dispersed by pressure loss. (For example, see Patent Document 1)
According to this means, most of the structural and construction variations are eliminated, the fuel supplied from the bottom surface of the fuel dispersion chamber 11 is effectively dispersed, and the volume flow rate is almost uniform in the upper fuel cell 1. Can be supplied to.
However, due to heat dissipation from the outer peripheral surface of the fuel dispersion chamber 11, a temperature distribution is generated in the fuel dispersion chamber 11, and the fuel density is reduced due to thermal expansion at a high temperature, and the volume flow rate is almost uniform. Even if the fuel is dispersed, the mass flow rate of the fuel is lower at a higher temperature than at a relatively lower temperature. In particular, variations that are discovered by checking the power generation performance during operation, such as individual differences in the calorific value of the cell and variations in construction, cannot be flexibly handled according to the power generation situation, and fuel The uneven mass flow rate is not resolved. Therefore, in the fuel battery cell 1 having a small fuel mass flow rate, the concentration overvoltage becomes stronger, the voltage is lowered, and the deterioration proceeds.
Further, regarding temperature distribution, there is a proposal that enables air or fuel flow paths to be arranged in the vicinity of a relatively high temperature fuel cell to cool a high temperature portion and adjust the temperature. (For example, see Patent Document 2)
According to this means, the fuel cell 1 that is relatively high in temperature can be cooled, and a uniform temperature state can be created in the entire power generation chamber 8.
However, providing a cooling channel between the fuel cells 1 increases the pitch between the fuel cells 1 and increases the installation area of the solid oxide fuel cell.
JP 2000-58087 A JP 2002-289250 A

  The present invention has been made in order to solve the above problems, and an object of the present invention is to adjust the mass flow rate of the fuel flowing through the fuel cell 1. It is to maintain high power and high efficiency operation of the oxide fuel cell.

  In order to achieve the above object, the present invention includes a cylindrical fuel cell, a power generation chamber in which a plurality of the cylindrical fuel cells are arranged, and a fuel dispersion chamber that supplies fuel in a dispersed state to the power generation chamber. In the solid oxide fuel cell, there is provided a solid oxide fuel cell characterized in that the fuel dispersion chamber is provided with an adjusting unit for adjusting a temperature distribution in the fuel dispersion chamber.

  In a preferred embodiment of the present invention, the adjustment unit has a heat exchange unit for cooling.

  In a preferred aspect of the present invention, a refrigerant that is sent to the heat exchange unit and a drive unit that sends the refrigerant to the heat exchange unit are provided.

  In a preferred embodiment of the present invention, the refrigerant is air.

  In a preferred embodiment of the present invention, the refrigerant is water.

  In a preferred embodiment of the present invention, the heat exchanging portion is located on the wall surface of the fuel dispersion chamber facing the power generation chamber.

  In a preferred embodiment of the present invention, a measurement unit that measures the voltage of the cylindrical fuel cell and a control unit that controls the operation of the adjustment unit by comparing the measured value and the threshold value in the measurement unit are provided.

According to the present invention, it is possible to prevent deterioration of the fuel cell due to fuel variation, and to maintain high performance at all times without having to reduce the performance of the entire fuel cell according to the fuel cell having a reduced voltage. can do.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a side sectional view of a cylindrical solid oxide fuel cell schematically showing a first embodiment of the present invention, and FIG. 2 is a three-dimensional view of a fuel dispersion chamber portion of the example.

  As shown in FIGS. 1 and 2, a plurality of cylindrical fuel cells 1 are housed inside a metal wall 4 with the sealing ends facing downward, and the fuel cells 1 and the metal located on the outermost periphery. An insulating wall 3 is arranged between the walls 4. In the fuel cell shown in FIG. 1, the fuel cell 1 is arranged in six rows in the horizontal direction and six rows in the vertical direction, and is stored in the center of the power generation chamber. The plurality of fuel cells 1 are electrically connected by the current collector 2 to exhibit a predetermined electric capacity. A voltage measurement line 13 is connected to the current collector 2 in advance at a required position, and is taken out of the metal wall 4. A partition plate 7 having an appropriate gas conduction hole or porosity is attached in the vicinity of the opening of the fuel cell 1, and the sealed end side of the fuel cell 1 is connected to the power generation chamber 8 and the fuel cell from the partition plate 7. One opening side is a combustion chamber 9. A fuel dispersion plate 16 having a gas conduction hole of an appropriate size is attached below the fuel cell 1, and a fuel dispersion chamber 11 is provided below the fuel dispersion plate 16. A fuel supply pipe 14 is connected to the fuel dispersion chamber 11, and the fuel dispersion chamber 12 is filled with a fuel dispersion material 12 such as an alumina ball or a porous material as necessary. A predetermined number and number of dispersion chamber heat exchange boxes 18 are attached as heat exchange portions 24 to the bottom surface, which is the wall surface of the fuel dispersion chamber 11 located facing the power generation chamber 8. A plurality of refrigerant pipes 22 are connected to the dispersion chamber heat exchange box 18, at least one of which is connected to the refrigerant driving unit 23 to serve as a refrigerant supply pipe, and the remaining refrigerant pipe 22 serves as a refrigerant discharge pipe. The heat exchanging unit 24, the refrigerant pipe 22, and the refrigerant driving unit 23 constitute an adjusting unit 25. When the refrigerant is a gas such as air, a fan or a blower is generally used for the refrigerant driving unit 23, and when the refrigerant is a liquid such as water, a pump is generally used. The combustion chamber 9 is connected to an exhaust gas duct 10, and an air distributor 6 is accommodated in the combustion chamber 9. An air supply pipe 15 connected to the air distributor 6 extends outside the metal wall 4. Yes. In addition, the same number of introduction pipes 5 as the fuel cells 1 are connected from the air distributor 6, and the introduction pipes 5 pass through the inside of the fuel cells 1 and have discharge ports directed downwardly of the fuel cells 1. Is provided. A heat insulating material 17 is disposed on the outer periphery of the metal wall 4 so that the temperature in the power generation chamber 8 can be maintained at a high temperature, and energy loss due to heat radiation is prevented.

When operating the solid oxide fuel cell configured as described above, the fuel gas is supplied from the fuel supply pipe 14, is effectively dispersed in the fuel dispersion chamber 11, and enters the power generation chamber 8 from the fuel dispersion plate 16. The fuel cell 1 contacts the outer surface of the fuel cell 1 while flowing toward the upper partition plate 7. On the other hand, air is supplied from the air supply pipe 15 to the air distributor 6, where it is effectively dispersed, and the air contacts the inner surface of the fuel cell 1 through the introduction pipe 5. When the temperature of the fuel cell 1 is raised from the operating temperature of about 700 ° C. to 1000 ° C., O ²⁻ ions are generated from the air electrode inside the fuel cell 1 to the fuel electrode outside the fuel cell 1. It moves and causes an electrochemical reaction, generating electricity. Water vapor and unreacted fuel gas generated during power generation pass through a partition plate 7 having an appropriate pressure loss and ventilation function and enter the combustion chamber 9, where unreacted residue remains inside the fuel cell 1. It is mixed with air and discharged from the exhaust gas duct 10 after ignition and combustion. Since the partition plate 7 has an appropriate pressure loss, the gas in the combustion chamber 9 is prevented from flowing back to the power generation chamber 8.

During operation of the solid oxide fuel cell, a temperature distribution in the power generation chamber 8 and the fuel dispersion chamber 11 due to heat radiation from the metal wall 4 and a temperature distribution due to individual differences in the calorific value of the cell occur, and the temperature is high. Then, the density of the fuel is reduced due to thermal expansion. Therefore, the mass flow rate of the fuel is smaller in the place where the temperature is higher than the place where the temperature is relatively low, and the potential of the fuel cell 1 located there is lowered.
Here, it is assumed that the heat in the fuel dispersion chamber 11 is partially taken away by the adjusting unit 25 located immediately below the place where the mass flow rate of the fuel is low. In other words, in the example of FIG. 1, a fluid serving as a refrigerant is caused to flow from the refrigerant driving unit 23 to the refrigerant pipe 22 through the dispersion chamber heat exchange box 18, and the refrigerant is effective through the dispersion chamber heat exchange box 18 that is the heat exchange unit 24. The heat in the fuel dispersion chamber 11 is partially taken away. By doing so, since the density of the fuel becomes relatively large in the cooled portion in the fuel dispersion chamber 11, the mass flow rate of the fuel flowing upward from there can be intentionally increased, and the fuel is located there. The potential of the fuel cell 1 can be raised.

  Further, similarly to the deviation of fuel dispersion due to structural or constructional variations, the fluid is supplied to the dispersion chamber heat exchange box 18 located just below the place where the mass flow rate of the fuel is reduced, By partially depriving the heat in the fuel dispersion chamber 11, the mass flow rate of the fuel flowing upward from there can be increased intentionally.

It is effective to use air as the fluid flowing through the heat exchanging section 24. If it is air, a sufficient amount can always be procured from outside air, and the cost of the material itself is not required. Further, if the air supplied to the fuel cell 1 is used as a refrigerant sent to the heat exchanging unit 24 and then supplied to the fuel cell 1 in a preheated state, the heat recovered from the fuel dispersion chamber 11 can be used effectively. The overall efficiency of the solid oxide fuel cell can be increased.
It is also effective to use water as the fluid that flows to the heat exchange unit 24. Since water has a large heat capacity per volume, a cooling effect can be obtained with a very small flow rate. Thereby, the heat exchange part 24 can be reduced more in size and the piping diameter of the refrigerant | coolant pipe | tube 22 can also be made small. In addition, when the solid oxide fuel cell uses a hydrocarbon-based fuel such as city gas as a fuel, steam for reforming is required, and in many cases, a steam generator is provided to vaporize the water. ing. Therefore, if the water used for the reforming steam is used as a refrigerant sent to the heat exchanging section 24 and then supplied to the steam generator in a preheated state, the heat recovered from the fuel dispersion chamber 11 can be effectively utilized, The overall efficiency of the oxide fuel cell can be increased.
The overall efficiency referred to here is the ratio of the total value of the generated power and the thermal energy used to the amount of fuel heat input.

The biggest factor causing the deviation in the mass flow rate of the fuel is the temperature distribution in the power generation chamber 8 and the fuel dispersion chamber 11 due to heat radiation from the metal wall 4. In this regard, the temperature of the central portion is relatively high in plan view. Therefore, it is effective to arrange the heat exchanging part 24 in the planar center part of the fuel dispersion chamber 11. As shown in FIG. 3, when the bottom surface of the fuel dispersion chamber 11 is equally divided into 16, as shown in FIG. 3, the division range indicated by hatching is defined as the fuel dispersion chamber central portion 26 and the other division ranges. Is the fuel dispersion chamber peripheral portion 27, the heat transfer area of the heat exchange portion 24 in the fuel dispersion chamber central portion 26 is larger than the heat transfer area of the heat exchange portion 24 in the fuel dispersion chamber peripheral portion 27. Represents.
In the case where deviation of fuel dispersion due to the structure of the power generation chamber 8 or the fuel dispersion chamber 11 occurs, the heat exchange unit 24 is arranged at an optimum position according to the situation.
When dealing with unpredictable deviations in fuel dispersion caused by variations in construction, heat exchange units 24 are provided at a plurality of locations in the fuel dispersion chamber 11, and means for detecting deviations in fuel dispersion are provided. The effect can be obtained by flowing the refrigerant through the heat exchanging portion 24 at a necessary location according to the detection result of the dispersion bias.

Regarding the flow rate control of the refrigerant to the heat exchanging unit 24, factors that can be predicted such as the distribution of the mass flow rate of the fuel due to the temperature distribution in the power generation chamber 8 and the fuel dispersion chamber 11 due to heat radiation from the metal wall 4. On the other hand, an optimal refrigerant supply amount can be set in advance according to parameters such as the power generation output and the supply amount of fuel and air supplied to the fuel cell 1. In this way, the temperature distribution of the fuel dispersion chamber 11 can be controlled with a very simple circuit, and the mass flow rate of the fuel supplied to the fuel cell 1 can be optimized.
As a method for optimally controlling the mass flow rate of the fuel supplied to the fuel cell 1 with higher accuracy, the fuel cell 1 in the portion where the mass flow rate of the fuel is reduced is utilized to reduce the voltage. There is a method of observing the voltage drop of the cell 1 and controlling the supply position / flow rate of the refrigerant according to the location / voltage value. For example, a voltage measurement line 13 is installed in advance so that a partial potential of a plurality of fuel cells 1 can be measured, and a corresponding location according to an observed voltage value during operation of the solid oxide fuel cell. The flow rate of the refrigerant supplied to the heat exchange unit 24 is feedback-controlled, so that the voltage distribution of the fuel cell 1 can always be made uniform. In the feedback control, a voltage threshold value is set in advance, and when the voltage of the fuel cell 1 falls below the threshold value, a method of increasing the supply flow rate of the refrigerant by a certain amount or a voltage threshold value is set in a plurality of steps in advance. In addition, when the voltage of the fuel battery cell 1 falls below these thresholds, a method of increasing the supply flow rate of the refrigerant by a certain amount according to the level of the voltage threshold, or a voltage in which the voltage of the fuel battery cell 1 is set in advance. When the value falls below the threshold value, a method of increasing the flow rate of the refrigerant according to a function equation set in advance according to the decrease range of the voltage value from the voltage threshold value can be used.
With respect to the installation of the voltage measurement line 13, a location where the voltage drop of the fuel cell 1 can be predicted, such as the distribution of the mass flow rate of the fuel due to heat dissipation, for example, the central portion when the power generation chamber 8 is viewed in plan. It is necessary to install a voltage measurement line 13. If the voltage measurement line 13 is installed only in a place where the voltage drop of the fuel cell 1 can be predicted in advance, optimizing the mass flow rate of the fuel supplied to the fuel cell 1 is effective at low cost. Can be realized. Alternatively, if the voltage measurement line 13 is installed in advance so that the voltage at each location can be measured by dividing the fuel cell 1 in units of a plurality of units, the entire solid oxide fuel cell can be observed without leakage, and heat radiation Not only for factors that can be predicted, such as the distribution of the mass flow rate of fuel due to the fuel, but also for factors that cannot be predicted, such as individual differences in the fuel cells 1 and variations in construction, The voltage drop of the fuel cell 1 can be observed, and the mass flow rate of the fuel supplied to the fuel cell 1 can be optimized by controlling the flow rate of the refrigerant supplied to the heat exchanging portion 24 at the corresponding location. It is not necessary to reduce the performance of the entire fuel cell according to the fuel cell in which the voltage is reduced while preventing the battery cell 1 from deteriorating, and high performance can always be maintained.

In the configuration described in the first embodiment of the present invention, a dispersion chamber heat exchange box 18 is provided at the center of the bottom surface of the fuel dispersion chamber 11 as the heat exchange portion 24, and an experiment is performed when air is used as a fluid flowing therethrough. The results are shown in FIGS.
When the air supply flow rate to the dispersion chamber heat exchange box 18 is 80 NL / min, the temperature at the center is 8 ° C. higher than the end of the fuel dispersion chamber 11 as shown in FIG. 7, and at this time, as shown in FIG. The voltage of the fuel cell 1 located at the center was 55 mV lower than the voltage of the fuel cell 1 located at the end. Therefore, it is considered that the progress of deterioration of the fuel cell 1 located in the central portion is faster than that of the fuel cell 1 located in the end portion. Therefore, when the amount of air supplied to the dispersion chamber heat exchange box 18 is increased to 100 NL / min, the temperature of the fuel dispersion chamber 11 is conversely lowered by 4 ° C. from the end as shown in FIG. Thus, as shown in FIG. 10, the difference can be reduced to a state where the voltage of the fuel cell 1 located in the center is 23 mV lower than the voltage of the fuel cell 1 located at the end. The deterioration of the fuel battery cell 1 was suppressed.

FIG. 4 is a side sectional view of a cylindrical solid oxide fuel cell schematically showing the second embodiment of the present invention.
As shown in FIG. 4, the heat exchanging section 24 can be constituted by a dispersion chamber heat exchange box 18 and heat exchange fins 19 installed inside the fuel dispersion chamber 11. By doing so, the heat transfer area per unit affixed area to the bottom surface of the fuel dispersion chamber 11 of the dispersion chamber heat exchange box 18 increases dramatically, so that the temperature in the fuel dispersion chamber 11 can be efficiently reduced with a small amount of refrigerant. Can be adjusted.

FIG. 5 is a side sectional view of a cylindrical solid oxide fuel cell schematically showing a third embodiment of the present invention.
As shown in FIG. 5, the heat exchanging section 24 can be used as a heat exchanging pipe 19 by allowing the refrigerant pipe 22 to flow directly into the fuel dispersion chamber 11. By doing so, heat can be directly exchanged to the inside of the fuel dispersion chamber 11 without substantially obstructing the fuel dispersion flow path in the fuel dispersion chamber 11, so that the inside of the fuel dispersion chamber 11 can be efficiently produced with a small flow rate of refrigerant. The temperature of can be adjusted.

FIG. 6 is a side sectional view of a cylindrical solid oxide fuel cell schematically showing a fourth embodiment of the present invention.
In FIG. 6, a cooling fan 21 is provided on the bottom surface, which is the wall surface of the fuel dispersion chamber 11 located on the opposite side of the power generation chamber 8. By doing so, a pipe for supplying a fluid as a refrigerant is not necessary, and the apparatus can be made compact.

The fuel cell according to the present invention may be one in which the fuel cells are arranged in a row, but preferably the fuel cells are arranged in a plurality of rows in the vertical and horizontal directions. This is because when the fuel cell is manufactured with the same number of cells, the latter can reduce the outer surface area of the fuel cell and reduce the temperature drop due to heat dissipation.

1 is a side sectional view of a cylindrical solid oxide fuel cell schematically showing a first embodiment of the present invention. It is a three-dimensional view of the fuel dispersion chamber portion schematically showing the same example. It is a top view of the fuel dispersion | distribution chamber part bottom face which shows the same example schematically. It is side surface sectional drawing of the cylindrical solid oxide fuel cell which shows the 2nd Example of this invention schematically. It is side surface sectional drawing of the cylindrical solid oxide fuel cell which shows the 3rd Example of this invention schematically. It is side surface sectional drawing of the cylindrical solid oxide fuel cell which shows the 4th Example of this invention schematically. 6 is a graph of fuel dispersion chamber temperature-fuel dispersion chamber arrangement showing experimental results when the refrigerant air flow rate is 80 NL / min in the first embodiment of the present invention. It is a graph of the voltage-fuel dispersion | distribution chamber arrangement | positioning showing the experimental result when the refrigerant | coolant air flow rate is 80 NL / min in the 1st Example of this invention. 6 is a graph of fuel dispersion chamber temperature-fuel dispersion chamber arrangement showing experimental results when the refrigerant air flow rate is 100 NL / min in the first embodiment of the present invention. It is a graph of voltage-fuel dispersion | distribution chamber arrangement | positioning showing the experimental result when the refrigerant | coolant air flow rate in the 1st Example of this invention is 100 NL / min. It is side surface sectional drawing which shows the conventional solid oxide fuel cell system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 2 ... Current collector 3 ... Insulating wall 4 ... Metal wall 5 ... Introducing pipe 6 ... Air distributor 7 ... Partition plate
DESCRIPTION OF SYMBOLS 8 ... Power generation chamber 9 ... Combustion chamber 10 ... Exhaust gas duct 11 ... Fuel dispersion chamber 12 ... Fuel dispersion material 13 ... Voltage measurement line 14 ... Fuel supply pipe 15 ... Air supply pipe 16 ... Fuel dispersion plate 17 ... Heat insulation material 18 ... Dispersion chamber Heat exchange box 19 ... Heat exchange fin 20 ... Dispersion chamber heat exchange pipe 21 ... Cooling fan 22 ... Refrigerant pipe 23 ... Refrigerant drive unit 24 ... Heat exchange unit 25 ... Adjustment unit 26 ... Fuel dispersion chamber central portion 27 ... Around fuel dispersion chamber Part

Claims (7)

A solid oxide fuel cell comprising: a cylindrical fuel cell; a power generation chamber in which a plurality of the cylindrical fuel cells are arranged; and a fuel dispersion chamber that supplies fuel in a dispersed state to the power generation chamber. A solid oxide fuel cell, wherein the chamber is provided with an adjustment unit for adjusting a temperature distribution in the fuel dispersion chamber. The solid oxide fuel cell according to claim 1, wherein the adjustment unit includes a heat exchange unit for cooling. The solid oxide fuel cell according to claim 2, further comprising: a refrigerant sent to the heat exchange unit; and a drive unit that sends the refrigerant to the heat exchange unit. The solid oxide fuel cell according to claim 3, wherein the refrigerant is air. The solid oxide fuel cell according to claim 3, wherein the refrigerant is water. 6. The solid oxide fuel cell according to claim 2, wherein the heat exchanging portion is located on a wall surface of the fuel dispersion chamber facing the power generation chamber. 2. A measuring unit that measures the voltage of the cylindrical fuel cell, and a control unit that controls the operation of the adjusting unit by comparing a measured value in the measuring unit with a threshold value. 7. The solid oxide fuel cell according to any one of items 1 to 6.

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