JP6612166B2 - Fuel processing apparatus and fuel cell module - Google Patents

Description

  The present invention relates to a fuel processing apparatus that processes raw fuel to generate fuel gas containing hydrogen as a main component, and a fuel cell module including the fuel processing apparatus.

  Generally, a heat insulating layer is used in this type of fuel processing apparatus or fuel cell module. Conventionally, a silica-alumina-based high-performance heat insulating material is often used as the heat insulating layer (see, for example, Patent Document 1). Moreover, a vacuum heat insulation layer may be used as a heat insulation layer (for example, refer patent document 2).

JP 2004-182528 A Japanese Patent Laid-Open No. 2005-9553

  However, even if it is a silica alumina type high performance heat insulating material, when heat-insulating a high temperature part, it is necessary to enlarge thickness, and it becomes a factor which inhibits size reduction.

  In addition, the use of a vacuum heat insulating layer has the advantage that the thickness can be reduced. However, in fuel processing devices and fuel cell modules that handle high-temperature hydrogen, the permeation of hydrogen from the container is inevitable, and the vacuum heat insulating layer There is a problem that the degree of vacuum is reduced.

  In order to avoid this problem, for example, Patent Document 2 proposes providing a space between a heat insulator having a vacuum heat insulating layer and a gas filler. However, even if a space is provided, as time elapses, the hydrogen concentration in the space increases, and hydrogen permeates the container and reduces the degree of vacuum of the vacuum heat insulating layer. In addition, it is conceivable that the air in the space is actively dissipated to the outside so that the hydrogen concentration in the space does not become high, but in this case, heat is released to the outside, and the system efficiency is lowered.

  In view of the above circumstances, an object of the present invention is to provide a fuel processing device and a fuel cell module that can be miniaturized, can ensure heat insulation, and can suppress a decrease in system efficiency.

The fuel processing apparatus according to the first aspect has a multi-tube structure and a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first tube and the second tube from the outside. A fuel processor main body, and at least a double multi-tube structure provided outside the fuel processor main body, and having a vacuum heat insulating layer between the first tube and the second tube from the outside And a heat insulating structure having an air flow path that communicates with an air introduction port of the combustion chamber of the fuel processing apparatus main body or the fuel cell stack and flows through the inside of the second pipe from the outside.

  According to this fuel processor, a heat insulating structure having at least a double multi-tube structure is provided outside the fuel processor main body having the fuel gas flow path. This heat insulating structure has a vacuum heat insulating layer having a high heat insulating property between the first tube and the second tube from the outside as compared with, for example, a silica alumina high performance heat insulating material. Therefore, since the thickness of the heat insulating structure can be reduced, the fuel processing apparatus can be reduced in size.

  Moreover, the heat insulation structure has an air flow path through which air flows inside the second tube from the outside. Therefore, even if hydrogen in the fuel gas flowing through the fuel gas passage penetrates the first pipe or the like from the outside of the fuel processing apparatus main body and enters the air passage, the hydrogen flows along with the air flow in the air passage. The partial pressure of becomes low. For this reason, it can suppress that the hydrogen which penetrate | invaded into the air flow path permeate | transmits a 2nd pipe | tube from the outer side of a heat insulation structure, and penetrate | invades into a vacuum heat insulation layer. Thereby, since the vacuum degree of a vacuum heat insulation layer can be maintained, heat insulation can be ensured.

  Further, the air flow path communicates with the combustion chamber of the fuel processing apparatus main body or the air inlet of the fuel cell stack. Therefore, the air flowing through the air flow path and preheated by heat exchange with the fuel gas can be used for combustion in the combustion chamber of the fuel processing apparatus main body or power generation of the fuel cell stack. Thereby, compared with the case where the air which flows through an air flow path is dissipated outside, the fall of system efficiency can be suppressed, for example.

The fuel processor according to the second aspect is the fuel processor according to the first aspect , wherein the second tube from the outside in the heat insulation structure is more than the first tube from the outside in the heat insulation structure. It may be thick.

  According to this fuel processing apparatus, since the second tube from the outside in the heat insulation structure is thicker than the first tube from the outside in the heat insulation structure, hydrogen that has entered the air flow path is second from the outside of the heat insulation structure. It is possible to further effectively suppress the penetration of the second tube and entering the vacuum heat insulating layer. Thereby, the vacuum degree of a vacuum heat insulation layer can be maintained higher.

  Moreover, the rigidity of a heat insulation structure can be improved because the 2nd pipe | tube from the outer side in a heat insulation structure is thick.

The fuel processing apparatus according to the third aspect is the fuel processing apparatus according to the first aspect or the second aspect , wherein the vacuum heat insulating layer may be provided with a radiant heat reflecting material.

  According to this fuel processing apparatus, since the radiant heat reflecting material is provided in the vacuum heat insulating layer, the radiant heat from the fuel processing apparatus main body can be reflected by the radiant heat reflecting material. Thereby, heat insulation can be improved.

A fuel processor according to a fourth aspect is the fuel processor according to any one of the first to third aspects , wherein a gas adsorbent may be enclosed in the vacuum heat insulating layer. .

  According to this fuel processing apparatus, since the gas adsorbent is sealed in the vacuum heat insulating layer, the gas that has entered the vacuum heat insulating layer can be adsorbed by the gas adsorbent. Thereby, the vacuum degree of a vacuum heat insulation layer can be maintained higher.

A fuel processor according to a fifth aspect is the fuel processor according to any one of the first to fourth aspects , wherein the temperature of the fuel processor main body is relatively high with respect to a surrounding portion. Each of the axially opposite ends of the heat insulation structure has extension portions protruding in the axial direction of the heat insulation structure with respect to the high temperature portion. Each may be filled with a heat insulating material.

  According to this fuel processing apparatus, at both ends in the axial direction of the heat insulating structure, extensions extending in the axial direction of the heat insulating structure with respect to the high temperature part are formed, and inside each extension, Each is filled with insulation. Therefore, it can suppress that the heat | fever of a high temperature part escapes from the axial direction both ends of a heat insulation structure. Thereby, heat insulation can be improved more.

A fuel processor according to a sixth aspect is the fuel processor according to any one of the first to fifth aspects , wherein the heat insulating structure is separate from the fuel processor main body, A heat insulating material may be filled between the fuel processor main body and the heat insulating structure.

  According to this fuel processing apparatus, since the heat insulating material is filled between the fuel processing apparatus main body and the heat insulating structure, the heat insulating property can be improved.

  Further, since the heat insulating structure is separate from the fuel processing apparatus main body, the heat insulating material can be easily filled between the fuel processing apparatus main body and the heat insulating structure when the fuel processing apparatus is assembled.

A fuel processor according to a seventh aspect is the fuel processor according to any one of the first to fifth aspects , wherein the heat insulating structure is integrated with the fuel processor main body, The air flow path may be formed between the second pipe from the outside in the heat insulating structure and the first pipe from the outside in the fuel processing apparatus main body.

  According to this fuel processing apparatus, since the heat insulating structure is integral with the fuel processing apparatus main body, when manufacturing the multi-tube structure including the fuel processing apparatus main body and the heat insulating structure, the heat insulating structure is used as the fuel processing apparatus main body. Can be assembled together. Thereby, for example, the number of assembling steps can be reduced as compared with the case where the heat insulating structure is a separate body from the main body of the fuel processing apparatus, and thus the cost can be reduced.

A fuel processing apparatus according to an eighth aspect is the fuel processing apparatus according to the seventh aspect , wherein the fuel processing apparatus main body includes a high temperature portion whose temperature is relatively higher than a surrounding portion, and a shaft of the high temperature portion. And a low-temperature part that is lower in temperature than the high-temperature part, the outer peripheral part of the high-temperature part is covered by the heat insulating structure, and the outer peripheral part of the low-temperature part is insulated It may be covered with a material.

  According to this fuel processing apparatus, since the outer peripheral part of the high temperature part is covered with the heat insulating structure including the vacuum heat insulating layer, it is possible to exhibit high heat insulation for the high temperature part that requires high heat insulation.

  Moreover, although the outer peripheral part of the low temperature part is covered with the heat insulating material, since the low temperature part does not require high heat insulation, the thickness of the heat insulating material may be thin. Thereby, size reduction of a fuel processing apparatus is realizable.

  Furthermore, since it is not necessary to cover the outer peripheral part of the low temperature part with the vacuum heat insulating layer, the degree of freedom in designing the fuel processor main body including the high temperature part and the low temperature part can be increased.

A fuel cell module according to a ninth aspect is disposed alongside the fuel processing apparatus according to any one of the first to eighth aspects and the fuel processing apparatus in an axial direction of the fuel processing apparatus. And a fuel cell stack that generates electric power by an electrochemical reaction between the fuel gas channel and the fuel gas supplied through the air channel and air.

According to this fuel cell module, since the fuel processing apparatus according to any one of the first to eighth aspects described above is provided, the fuel cell module can be downsized, heat insulation can be secured, and system efficiency can be improved. The decrease can be suppressed.

As described above in detail, according to the fuel processing device and the fuel cell module of this aspect , it is possible to reduce the size, to ensure heat insulation, and to suppress a decrease in system efficiency.

It is a longitudinal section showing the whole fuel processor concerning the first embodiment of the present invention. It is an enlarged view of the upper half part of the fuel processing apparatus shown by FIG. It is an enlarged view of the lower half part of the fuel processor shown in FIG. In the fuel processing apparatus which concerns on 1st embodiment of this invention, it is a principal part expanded longitudinal cross-sectional view which shows the modification which enclosed the gas adsorbent in the vacuum heat insulation layer. It is a longitudinal cross-sectional view which shows the whole structure of the fuel cell module to which the fuel processing apparatus which concerns on 2nd embodiment of this invention was applied. It is an enlarged view of the upper half part of the fuel cell module shown in FIG. It is an enlarged view of the lower half part of the fuel cell module shown in FIG. In the fuel cell module according to the second embodiment of the present invention, an enlarged vertical cross-sectional view of a main part showing a modification in which a gas adsorbent is sealed in a vacuum heat insulating layer. It is a longitudinal cross-sectional view which shows the comparative example of the fuel processing apparatus with respect to 1st embodiment of this invention.

[First embodiment]
First, a first embodiment of the present invention will be described.

(Overall configuration of fuel processor)
The fuel processing apparatus 10 according to the first embodiment of the present invention shown in FIGS. 1 to 3 is, for example, for PEFC (solid polymer fuel cell), and processes raw fuel to mainly contain hydrogen. To produce a fuel gas. The fuel processor 10 includes a fuel processor main body 20 and a heat insulating structure 70.

  In each drawing, an arrow A1 indicates one axial side of the fuel processing apparatus 10, and an arrow A2 indicates the other axial direction of the fuel processing apparatus 10. As an example, the fuel processing apparatus 10 is arranged such that one side in the axial direction is the upper side and the other side in the axial direction is the lower side. Hereinafter, description will be made assuming that one axial side of the fuel processing apparatus 10 is an upper side and the other axial side of the fuel processing apparatus 10 is a lower side.

(Configuration of fuel processor main body)
The fuel processor main body 20 has a multiple tube structure and includes quadruple tubes 21 to 24. The quadruple tubes 21 to 24 are made of a metal having high heat conductivity such as stainless steel. Further, as the quadruple tubes 21 to 24, for example, cylindrical tubes such as a cylindrical tube having a circular cross section and an elliptic tube having an elliptical cross section are used.

  The quadruple pipes 21 to 24 are arranged in order from the radially outer side to the inner side of the fuel processor main body 20. Hereinafter, the first tube 21 from the outside is referred to as the first tube 21, the second tube 22 from the outside is referred to as the second tube 22, the third tube 23 from the outside is referred to as the third tube 23, and the four from the outside. The second tube 24 is referred to as the fourth tube 24.

  Between the first pipe 21 and the second pipe 22 is formed as a fuel gas flow path 31, and between the second pipe 22 and the third pipe 23 is formed as a fuel processing flow path 32. Further, a space between the third pipe 23 and the fourth pipe 24 is formed as a combustion exhaust gas flow path 33, and an inside of the fourth pipe 24 is formed as a combustion chamber 34.

  The fuel gas channel 31 and the fuel processing channel 32 communicate with each other at their lower ends, and the combustion exhaust gas channel 33 and the combustion chamber 34 also communicate with each other at their lower ends. A reforming catalyst layer 35 is provided in the lower part of the fuel processing channel 32, and a shift catalyst layer 36 and a selective oxidation catalyst layer 37 are provided in the upper part of the fuel gas channel 31.

  The portion of the fuel processor main body 20 in which the reforming catalyst layer 35 is provided in the axial direction constitutes a reformer 41, and the shift catalyst layer 36 and the selective oxidation catalyst layer 37 in the axial direction of the fuel processor main body 20 are provided. The part provided with constitutes the carbon monoxide reduction part 42. The reforming part 41 and the carbon monoxide reducing part 42 are high temperature parts where the temperature is relatively higher than the surrounding part.

  A reforming water introduction pipe 51 is connected to the upper end portion of the second pipe 22, and the upper part of the second pipe 22 in the vertical direction (the part where the shift catalyst layer 36 is located) A raw fuel introduction pipe 52 is connected. The inside of the reforming water introduction pipe 51 and the inside of the raw fuel introduction pipe 52 communicate with the fuel processing flow path 32, respectively.

  A selective oxidation air introduction pipe 53 is connected to a portion of the first pipe 21 corresponding to the selective oxidation catalyst layer 37, and a fuel gas delivery pipe 54 is connected to the upper end of the first pipe 21. Yes. The inside of the selective oxidizing air introduction pipe 53 and the inside of the fuel gas delivery pipe 54 communicate with the fuel gas flow path 31.

  A burner 60 is provided above the combustion chamber 34. The burner 60 is disposed in the axial center portion of the combustion chamber 34. A fuel introduction pipe 61 is connected to the upper end portion of the burner 60. The fuel introduction pipe 61 is located above an upper end opening of a heat insulating structure 70 described later.

  A combustion air introduction pipe 62 is connected to the upper wall portion of the combustion chamber 34. The combustion air introduction pipe 62 is curved after extending upward from the upper part of the third pipe 73 of the heat insulating structure 70 described later, and then extends downward and is connected to the upper wall portion of the combustion chamber 34. Has been. The inside of the combustion air introduction pipe 62 and the inside of the fuel introduction pipe 61 communicate with the combustion chamber 34, respectively.

  A combustion exhaust gas discharge pipe 63 is connected to the upper end portion of the third pipe 23. The inside of the flue gas exhaust pipe 63 communicates with the flue gas passage 33. The combustion exhaust gas discharge pipe 63, the above-described reforming water introduction pipe 51, raw fuel introduction pipe 52, selective oxidation air introduction pipe 53, and fuel gas delivery pipe 54 all extend upward. The distal end portion protrudes upward from an upper end opening of a heat insulating structure 70 described later.

(Configuration of heat insulation structure)
The heat insulating structure 70 is separate from the fuel processing apparatus main body 20 and is provided on the outer side (radially outer side) of the fuel processing apparatus main body 20. The heat insulating structure 70 is also a multi-tube structure and includes triple tubes 71 to 73. The triple tubes 71 to 73 are made of, for example, a metal having high heat conductivity such as stainless steel. For the triple tubes 71 to 73, for example, a cylindrical tube such as a cylindrical tube having a circular cross section or an elliptic tube having a circular cross section is used, similar to the multiple tube of the fuel processor main body 20 described above. ing.

  The triple tubes 71 to 73 are disposed in order from the radially outer side to the inner side of the heat insulating structure 70. Hereinafter, the first tube 71 from the outside is referred to as the first tube 71, the second tube 72 from the outside is referred to as the second tube 72, and the third tube 73 from the outside is referred to as the third tube 73.

  A space between the first tube 71 and the second tube 72 is sealed and formed as a vacuum heat insulating layer 81. Although not particularly illustrated, the first pipe 71 is provided with a nozzle. After the heat insulating structure 70 is assembled, air between the first pipe 71 and the second pipe 72 is sucked through the nozzle. A vacuum heat insulating layer 81 is formed.

  Further, an air flow path 82 is formed inside the second pipe 72, that is, between the second pipe 72 and the third pipe 73. The second pipe 72 is thicker than the first pipe 71, and the vacuum heat insulating layer 81 is provided with a radiant heat reflecting material 83. The radiant heat reflector 83 is provided from the lower end portion to the upper end portion of the vacuum heat insulating layer 81.

  In addition, an air introduction pipe 84 is connected to the lower end portion of the third pipe 73. The air introduction tube 84 extends downward, and its tip protrudes downward from the lower end opening of the heat insulating structure 70. In addition, the combustion air introduction pipe 62 is connected to the upper end portion of the third pipe 73 as described above. The inside of the air introduction pipe 84, the air flow path 82, the inside of the combustion air introduction pipe 62, and the above-described combustion chamber 34 communicate with each other.

  A heat insulating material 90 is filled between the fuel processor main body 20 and the heat insulating structure 70. Further, an extension 74 is formed at the upper end of the heat insulation structure 70 so as to protrude upward with respect to the carbon monoxide reduction part 42 which is a high temperature part. An extension portion 75 that protrudes downward with respect to the reforming portion 41 is formed. The upper end portion and the lower end portion of the heat insulating structure 70 are examples of “both axial end portions of the heat insulating structure” in the present invention.

  And the upper end part 94 and the lower end part 95 of the heat insulating material 90 are each filled in the inside of each extension part 74 and 75 formed in the upper end part and lower end part of this heat insulation structure 70, respectively. The fuel processor main body 20 described above is covered from the upper side by the upper end portion 94 of the heat insulating material 90 and from the lower side by the lower end portion 95 of the heat insulating material 90.

  A wiring member 64 such as a thermocouple is provided at the lower end portion of the fuel processing apparatus main body 20, and this wiring member 64 passes through the lower end portion 95 of the heat insulating material 90 and is led out to the lower side of the fuel processing apparatus 10. Has been.

(Operation of fuel processor)
Next, the operation of the above-described fuel processing apparatus 10 will be described.

  When air is introduced into the air flow path 82 through the air introduction pipe 84, this air is supplied to the burner 60 in the combustion chamber 34 through the combustion air introduction pipe 62. In addition, combustion fuel is supplied to the burner 60 through the fuel introduction pipe 61, and this combustion fuel is burned in the combustion chamber 34. The combustion exhaust gas combusted in the combustion chamber 34 is discharged from the combustion exhaust gas discharge pipe 63 to the outside through the combustion exhaust gas passage 33.

  Further, the reforming water and the raw fuel are introduced into the fuel processing channel 32 through the reforming water introduction pipe 51 and the raw fuel introduction pipe 52. For example, city gas is preferably used as the raw fuel, but a gas mainly composed of a hydrocarbon such as propane may be used, and a hydrocarbon-based liquid may be used as the raw fuel.

  When the reforming water and raw fuel are introduced into the fuel processing channel 32, the reforming catalyst layer 35 provided in the fuel processing channel 32 uses the heat of the combustion exhaust gas flowing through the combustion exhaust gas channel 33. As a result, the raw fuel is steam-reformed and a fuel gas (reformed gas) containing hydrogen as a main component is generated. This fuel gas flows from the fuel processing channel 32 into the fuel gas channel 31.

  The fuel gas flowing through the fuel gas channel 31 passes through the shift catalyst layer 36 and the selective oxidation catalyst layer 37 in order. In the shift catalyst layer 36, carbon monoxide in the fuel gas is transformed by the shift reaction, and in the selective oxidation catalyst layer 37, carbon monoxide in the fuel gas is utilized using the air introduced from the selective oxidation air introduction pipe 53. Is removed by a selective oxidation reaction. The fuel gas from which carbon monoxide has been removed by the shift catalyst layer 36 and the selective oxidation catalyst layer 37 is sent to an external fuel cell or the like through the fuel gas delivery pipe 54.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  First, in order to clarify the operation and effect of the first embodiment of the present invention, a comparative example will be described. FIG. 9 shows a fuel processor 310 according to a comparative example. The fuel processing device 310 according to this comparative example has substantially the same configuration as the fuel processing device main body 20 as compared with the fuel processing device 10 according to the first embodiment described above, but a heat insulating layer that covers the fuel processing device main body 20. A silica-alumina-based heat insulating material 320 is used throughout.

  However, as in this comparative example, even when using a silica-alumina-based high-performance heat insulating material 320, it is necessary to increase the thickness in order to insulate the reformed portion or the like that is a high-temperature portion. This is a factor that hinders downsizing.

  On the other hand, according to the fuel processing apparatus 10 according to the first embodiment of the present invention shown in FIGS. 1 to 3, a triple multiple pipe is provided outside the fuel processing apparatus main body 20 having the fuel gas flow path 31. The heat insulation structure 70 which is a structure is provided. The heat insulating structure 70 includes a vacuum heat insulating layer 81 having a high heat insulating property between the first pipe 71 and the second pipe 72 as compared with, for example, a silica alumina high performance heat insulating material. Accordingly, since the heat insulating structure 70 can be thin, the fuel processing apparatus 10 can be downsized.

  That is, the imaginary line L shown in FIG. 1 shows the outer shape of the heat insulating material 320 of the fuel processing apparatus 310 according to the above-described comparative example, and the size of the heat insulating material 320 in the radial direction is φ2. On the other hand, in the fuel processing apparatus 10 according to the first embodiment of the present invention, the dimension in the radial direction of the heat insulating structure 70 is φ1, which is significantly smaller than φ2.

  Moreover, according to the fuel processing apparatus 10 according to the first embodiment of the present invention, the heat insulating structure 70 has the air flow path 82 through which air flows between the second pipe 72 and the third pipe 73. Yes. Therefore, hydrogen in the fuel gas flowing through the fuel gas flow path 31 passes through the first pipe 21 of the fuel processing apparatus main body 20, the heat insulating material 90, and the third pipe 73 of the heat insulating structure 70 and passes through the air flow path 82. However, the partial pressure of hydrogen decreases as the air flows in the air flow path 82. For this reason, it is possible to prevent hydrogen that has entered the air flow path 82 from passing through the second pipe 72 of the heat insulating structure 70 and entering the vacuum heat insulating layer 81. Thereby, since the vacuum degree of the vacuum heat insulation layer 81 can be maintained, heat insulation can be ensured.

  Further, the air flow path 82 is in communication with the combustion chamber 34 of the fuel processor main body 20. Therefore, the air flowing through the air flow path 82 and preheated by heat exchange with the fuel gas can be used for combustion in the combustion chamber 34 of the fuel processing apparatus main body 20. Thereby, compared with the case where the air which flows through the air flow path 82 is dissipated outside, the fall of system efficiency can be suppressed, for example.

  Further, since the second pipe 72 of the heat insulating structure 70 is thicker than the first pipe 71 of the heat insulating structure 70, hydrogen that has entered the air flow path 82 passes through the second pipe 72 of the heat insulating structure 70 and is vacuumed. Intrusion into the heat insulating layer 81 can be further effectively suppressed. Thereby, the vacuum degree of the vacuum heat insulation layer 81 can be maintained higher.

  In addition, since the second pipe 72 of the heat insulating structure 70 is thick, the rigidity of the heat insulating structure 70 constituting the outer portion of the fuel processing apparatus 10 can be improved.

  Further, since the radiant heat reflecting material 83 is provided on the vacuum heat insulating layer 81, the radiant heat from the fuel processing apparatus main body 20 can be reflected by the radiant heat reflecting material 83. Thereby, heat insulation can be improved.

  Further, at the upper end and the lower end of the heat insulating structure 70, extension portions 74 and 75 projecting upward and downward with respect to the reforming portion 41 and the carbon monoxide reduction portion 42 which are high temperature portions are formed, respectively. The upper ends 94 and the lower ends 95 of the heat insulating material 90 are filled inside the extensions 74 and 75, respectively. Therefore, the heat of the reforming part 41 and the carbon monoxide reduction part 42 which are high temperature parts can be prevented from escaping from the upper end part and the lower end part of the heat insulating structure 70. Thereby, heat insulation can be improved more.

  Moreover, since the heat insulating material 90 is filled between the fuel processor main body 20 and the heat insulating structure 70, the heat insulating property can be improved.

  Further, since the heat insulating structure 70 is separate from the fuel processing apparatus main body 20, the heat insulating material 90 is easily filled between the fuel processing apparatus main body 20 and the heat insulating structure 70 when the fuel processing apparatus 10 is assembled. be able to.

  Next, a modification of the first embodiment of the present invention will be described.

  As shown in FIG. 4, in the first embodiment described above, the gas adsorbent 100 may be enclosed in the vacuum heat insulating layer 81. Thus, when the gas adsorbent 100 is sealed in the vacuum heat insulating layer 81, the gas that has entered the vacuum heat insulating layer 81 can be adsorbed by the gas adsorbent 100. Thereby, the vacuum degree of the vacuum heat insulation layer 81 can be maintained higher.

  Further, in the first embodiment described above, the fuel processor main body 20 has a quadruple multi-tube structure having the fuel gas passage 31, the fuel treatment passage 32, and the combustion exhaust gas passage 33. Any structure may be used as long as it has a fuel gas passage 31 in which a fuel gas mainly composed of hydrogen flows between the pipe 21 and the second pipe 22.

  In the first embodiment described above, the heat insulating structure 70 has a triple multi-tube structure including the vacuum heat insulating layer 81 and the air flow path 82, but a vacuum is formed between the first pipe 71 and the second pipe 72. Any structure may be used as long as it has a heat insulation layer 81 and a multi-tube structure having an air flow path 82 inside the second pipe 72.

  Further, in the first embodiment described above, the heat insulating structure 70 is separate from the fuel processor main body 20, and the air flow path 82 includes the second pipe 72 of the heat insulating structure 70 having a triple multi-pipe structure. It is formed between the third pipe 73. However, the heat insulating structure 70 has a double multiple pipe structure integrated with the fuel processing apparatus main body 20, and the air flow path 82 includes the second pipe 72 of the heat insulating structure 70 and the first pipe of the fuel processing apparatus main body 20. 21 may be formed.

  In the first embodiment described above, the second pipe 72 of the heat insulating structure 70 is preferably configured to be thicker than the first pipe 71 of the heat insulating structure 70. If the permeation can be prevented, the second pipe 72 of the heat insulating structure 70 may be the same thickness as the first pipe 71 of the heat insulating structure 70 or may be thinner than the first pipe 71.

  In the first embodiment described above, the vacuum heat insulating layer 81 is preferably provided with the radiant heat reflecting material 83, but the radiant heat reflecting material 83 may be omitted.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

(Overall configuration of fuel cell module)
As shown in FIGS. 5 to 7, the fuel cell module M according to the second embodiment includes a fuel cell stack 230, a multi-pipe structure 240, an upper heat insulating material 214, and a lower heat insulating material 215. With.

  In each figure, an arrow A1 indicates one axial side of the fuel cell module M, and an arrow A2 indicates the other axial side of the fuel cell module M. As an example, the fuel cell module M is arranged such that one side in the axial direction is the upper side and the other side in the axial direction is the lower side. Hereinafter, description will be made assuming that one axial side of the fuel cell module M is an upper side and the other axial side of the fuel processing device 110 is a lower side.

(Configuration of fuel cell stack)
As an example, a solid oxide fuel cell (SOFC) is applied to the fuel cell stack 230. This fuel cell stack 230 is placed on a base member 241 provided at the bottom of the multi-pipe structure 240. The fuel cell stack 230 has a plurality of flat cells 231. The plurality of cells 231 are stacked in the vertical direction of the multi-pipe structure 240.

  Each cell 231 has a fuel electrode (anode electrode), an electrolyte layer, and an air electrode (cathode electrode). Each cell 231 generates power by an electrochemical reaction between the fuel gas supplied to the fuel electrode and the air (oxidant gas) supplied to the air electrode, and generates heat as the power is generated.

(Configuration of multi-pipe structure)
The multi-pipe structure 240 is a multi-ply multi-pipe structure. The multi-pipe structure 240 is classified into a fuel processor main body 120 and a heat insulation structure 190 by function. The fuel processor main body 120 is configured to have an inner triple tube structure of the multiple tube structure 240, and the heat insulation structure 190 includes an outer double tube structure of the multiple tube structure 240. It is configured.

  The plurality of tubes of the multiple tube structure 240 are made of a metal having high heat conductivity such as stainless steel, for example. Further, as the plurality of tubes of the multiple tube structure 240, for example, a cylindrical tube such as a cylindrical tube having a circular cross section or an elliptic tube having an elliptical cross section is used.

(Configuration of fuel processor main body)
The fuel processor main body 120 includes triple tubes 121 to 123. The triple pipes 121 to 123 are arranged in order from the radially outer side to the inner side of the fuel processor main body 120. Hereinafter, the first tube 121 from the outside is referred to as the first tube 121, the second tube 122 from the outside is referred to as the second tube 122, and the third tube 123 from the outside is referred to as the third tube 123.

  The fuel processor main body 120 includes a vaporization unit 131, a reforming unit 132, and a combustion unit 133 for each function. The vaporization unit 131, the reforming unit 132, and the combustion unit 133 are arranged in order from the upper side to the lower side of the fuel processing apparatus main body 120. The reforming part 132 and the combustion part 133 are high temperature parts where the temperature is relatively higher than the surrounding part such as the vaporization part 131. On the other hand, the vaporization part 131 is a low temperature part whose temperature is lower than that of the high temperature part.

  Between the first pipe 121 and the second pipe 122, a vaporization flow path 141 and a fuel gas flow path 151 are formed in an up and down direction. The vaporization channel 141 is formed from the upper end to the lower end of the vaporization unit 131, and the fuel gas channel 151 extends from the upper end of the reforming unit 132 to the lower end side of the combustion unit 133 (up to a partition wall 181 described later). It is formed over. The vaporization channel 141 and the fuel gas channel 151 are in communication with each other. The fuel gas channel 151 is an example of the “fuel gas channel through which a fuel gas mainly composed of hydrogen flows” in the present invention, and the reforming catalyst layer 152 is provided in the fuel gas channel 151. .

  A combustion exhaust gas passage 153 is formed between the second pipe 122 and the third pipe 123. The combustion exhaust gas channel 153 is formed across the vaporization part 131 and the reforming part 132. A raw fuel introduction pipe 161 is connected to the upper end of the first pipe 121, and a combustion exhaust gas discharge pipe 162 is connected to the upper end of the second pipe 122. The inner side of the raw fuel introduction pipe 161 communicates with the upper end portion of the vaporization passage 141, and the inner side of the combustion exhaust gas discharge pipe 162 communicates with the upper end portion of the combustion exhaust gas passage 153.

  The second pipe 122 extends downward with respect to the third pipe 123, and the inside of the lower part of the second pipe 122 is formed as a combustion chamber 135. The inside of the third pipe 123 is formed as a heat insulating space 136, and a tapered portion 137 extending into the combustion chamber 135 is formed at the lower end of the third pipe 123.

  An ignition electrode 171 is provided at the tip of the tapered portion 137. The ignition electrode 171 protrudes into the combustion chamber 135 from the tip (lower end) of the tapered portion 137 and is disposed at the center of the combustion chamber 135. A pipe 172 is accommodated inside the third pipe 123, and a conductive portion 173 connected to the ignition electrode 171 and insulated by an insulator is inserted inside the pipe 172.

  In the present embodiment, the fuel processing device 110 is configured by the vaporization unit 131, the reforming unit 132, the combustion unit 133, the raw fuel introduction pipe 161, the combustion exhaust gas discharge pipe 162, the ignition electrode 171 and the like. The above-described fuel cell stack 230 is arranged alongside the fuel processor 110 below the fuel processor 110.

  A storage portion 134 is provided below the fuel processing apparatus 110. That is, the lower part of the first pipe 121 of the fuel processing apparatus main body 120 is extended below the second pipe 122, and a cylindrical housing part 134 is formed by the lower part of the second pipe 122. A fuel cell stack 230 is accommodated inside the accommodating portion 134. The accommodating part 134 becomes high temperature by the heat which the fuel cell stack 230 discharge | releases. This accommodating part 134 comprises the high temperature part from which the temperature becomes high relatively with respect to the vaporization part 131 etc. which are the surrounding parts with the above-mentioned reforming part 132 and the combustion part 133.

  A partition wall 181 that partitions the combustion chamber 135 vertically is provided at the lower end of the second pipe 122. A communication hole 182 is formed at the center of the partition wall 181. An annular rectifying member 183 is provided on the lower surface of the partition wall 181 so as to surround the communication hole 182. The rectifying member 183 is provided between the fuel cell stack 230 and the partition wall 181.

  In addition, a fuel gas supply pipe 184 is provided inside the accommodating portion 134. The upper end portion of the fuel gas supply pipe 184 is connected to the partition wall portion 181, and the lower end portion of the fuel gas flow channel 151 and the fuel gas inlet 232 of the fuel cell stack 230 are formed in the partition wall portion 181. The hole 185 communicates with the inside of the fuel gas supply pipe 184.

(Configuration of heat insulation structure)
The heat insulating structure 190 is integral with the fuel processing apparatus main body 120 and is provided on the outer side (radially outer side) of the fuel processing apparatus main body 120. The heat insulating structure 190 covers the outer peripheral portions of the reforming portion 132, the combustion portion 133, and the accommodating portion 134 that are high-temperature portions. The heat insulating structure 190 has double pipes 191 and 192. The double pipes 191 and 192 are arranged in order from the radially outer side to the inner side of the heat insulating structure 190. Hereinafter, the first tube 191 from the outside is referred to as a first tube 191, and the second tube 192 from the outside is referred to as a second tube 192.

  A space between the first pipe 191 and the second pipe 192 is sealed and formed as a vacuum heat insulating layer 201. Although not particularly illustrated, the first pipe 191 is provided with a nozzle, and after the assembly of the multiple pipe structure 240 including the heat insulating structure 190, air between the first pipe 191 and the second pipe 192 is generated. By being sucked through the nozzle, the vacuum heat insulating layer 201 is formed.

  An air flow path 202 is formed inside the second pipe 192, that is, between the second pipe 192 and the first pipe 121 of the fuel processor main body 120. The second pipe 192 is thicker than the first pipe 191, and the radiant heat reflecting material 203 is provided on the vacuum heat insulating layer 201. The radiant heat reflector 203 is provided from the lower end portion to the upper end portion of the vacuum heat insulating layer 201.

  An air introduction pipe 204 is connected to the upper ends of the second pipe 192 and the first pipe 121 of the fuel processor main body 120. The inside of the air introduction pipe 204 communicates with the air flow path 202. An air supply path 242 is formed in the base member 241, and a lower end portion of the air flow path 202 communicates with the air inlet 233 of the fuel cell stack 230 through the air supply path 242.

  An extension portion 194 that protrudes upward with respect to the reforming portion 132 that is a high temperature portion is formed at the upper end portion of the heat insulation structure 190, and a storage portion that is a high temperature portion is formed at the lower end portion of the heat insulation structure 190. An extension portion 195 protruding downward with respect to 134 is formed. The upper end portion and the lower end portion of the heat insulating structure 190 are an example of “both axial end portions of the heat insulating structure” in the present invention.

  And the inside of each extension part 194,195 formed in the upper end part and lower end part of this heat insulation structure 190 is filled with the upper heat insulating material 214 and the lower heat insulating material 215, respectively. Moreover, the heat insulating material 214 provided inside the upper extension part 194 covers the outer peripheral part of the vaporization part 131 which is a low temperature part.

  Further, a wiring member 234 such as a power line is connected to the fuel cell stack 230, and this wiring member 234 passes through the lower heat insulating material 215 and is led out to the lower side of the fuel cell module M. Yes.

(Operation of fuel cell module)
Next, the operation of the fuel cell module M will be described.

  The raw fuel is supplied to the vaporization channel 141 through the raw fuel supply pipe. As this raw fuel, for example, a hydrocarbon fuel mixed with reforming water is used. As the hydrocarbon fuel, for example, city gas is preferably used, but a gas mainly composed of a hydrocarbon such as propane may be used, or a hydrocarbon-based liquid may be used.

  When raw fuel is supplied to the vaporization flow path 141, the raw fuel flows through the vaporization flow path 141 from the upper side to the lower side. At this time, in the vaporization unit 131, the combustion exhaust gas discharged from the combustion chamber 135 flows through the combustion exhaust gas passage 153 from the lower side to the upper side. When the combustion exhaust gas flows through the combustion exhaust gas flow channel 153 adjacent to the vaporization flow channel 141, heat is exchanged between the raw fuel flowing through the vaporization flow channel 141 and the combustion exhaust gas. And in the vaporization flow path 141, raw fuel is vaporized and raw fuel gas is produced | generated.

  The raw fuel gas vaporized in the vaporization channel 141 flows into the fuel gas channel 151. In the reforming unit 132, the combustion exhaust gas discharged from the combustion chamber 135 flows from the lower side to the upper side of the combustion exhaust gas channel 153, so that heat is exchanged between the raw fuel gas flowing through the fuel gas channel 151 and the combustion exhaust gas. The In the fuel gas channel 151, fuel gas (reformed gas) is generated from the raw fuel gas by the reforming catalyst layer 152 using the heat of the combustion exhaust gas.

  The fuel gas generated in the fuel gas flow channel 151 flows into the fuel gas supply pipe 184 through a hole 185 formed in the partition wall 181. The fuel gas is supplied to the fuel gas inlet 232 of the fuel cell stack 230 through the fuel gas supply pipe 184.

  On the other hand, in the reforming unit 132, air (oxidant gas) is supplied to the air flow path 202 through the air introduction pipe 204, and this air flows through the air flow path 202 from the upper side to the lower side. The air flowing through the air flow path 202 is preheated by the heat of the fuel cell stack 230 at the lower part of the air flow path 202. The preheated air is supplied to the air inlet 233 of the fuel cell stack 230 through an air supply path 242 formed in the base member 241.

  As described above, when fuel gas is supplied to the fuel gas inlet 232 of the fuel cell stack 230 and air is supplied to the air inlet 233 of the fuel cell stack 230, the fuel cell stack 230 In each cell 231, electric power is generated by an electrochemical reaction between fuel gas and air (oxidant gas). Each cell 231 generates heat with power generation.

  Further, when the fuel cell stack 230 generates power, the stack exhaust gas including the fuel electrode exhaust gas and the air electrode exhaust gas is discharged from the fuel cell stack 230 to the inside of the rectifying member 183. The stack exhaust gas is mixed in the rectifying member 183, ejected from the communication hole 182 of the partition wall 181, and supplied to the upper side of the partition wall 181.

  The stack exhaust gas supplied to the upper side of the partition wall 181 includes fuel gas and air that have not been supplied to the power generation in the fuel cell stack 230, and the stack exhaust gas supplied to the upper side of the partition wall 181. Is ignited and burned by a spark formed between the ignition electrode 171 and the pipe 172 or the like.

  When the stack exhaust gas is burned in the combustion chamber 135 in this way, the combustion exhaust gas is generated in the combustion chamber 135. This combustion exhaust gas flows into the combustion exhaust gas flow path 153 along the tapered portion 137. The flue gas flowing into the flue gas passage 153 flows from the lower side to the upper side through the flue gas passage 153 and is then discharged to the outside of the fuel cell module M through the flue gas exhaust pipe 162.

  Next, the operation and effect of the second embodiment of the present invention will be described.

  As described in detail above, according to the second embodiment of the present invention, the heat insulation structure 190 having a double multi-pipe structure is provided outside the fuel processor main body 120 having the fuel gas flow channel 151. ing. The heat insulating structure 190 includes a vacuum heat insulating layer 201 having a high heat insulating property between the first pipe 191 and the second pipe 192 as compared with, for example, a silica alumina high performance heat insulating material. Accordingly, since the heat insulating structure 190 can be thin, the fuel processing apparatus 110 can be downsized.

  The heat insulating structure 190 has an air flow path 202 through which air flows inside the second pipe 192. Therefore, even if hydrogen in the fuel gas flowing through the fuel gas flow channel 151 permeates through the first pipe 121 of the fuel processing apparatus main body 120 and enters the air flow channel 202, the hydrogen flows along the air flow in the air flow channel 202. The partial pressure of hydrogen is lowered. For this reason, hydrogen that has entered the air flow path 202 can be prevented from penetrating through the second pipe 192 of the heat insulating structure 190 and entering the vacuum heat insulating layer 201. Thereby, since the vacuum degree of the vacuum heat insulation layer 201 can be maintained, heat insulation can be ensured.

  Further, the air flow path 202 is communicated with the air inlet 233 of the fuel cell stack 230. Therefore, the air flowing through the air flow path 202 and preheated by heat exchange with the fuel gas can be used for power generation of the fuel cell stack 230. Thereby, compared with the case where the air which flows through the air flow path 202 is dissipated outside, the fall of system efficiency can be suppressed, for example.

  Further, since the second pipe 192 of the heat insulating structure 190 is thicker than the first pipe 191 of the heat insulating structure 190, the hydrogen that has entered the air flow path 202 passes through the second pipe 192 of the heat insulating structure 190 and is vacuumed. Intrusion into the heat insulating layer 201 can be further effectively suppressed. Thereby, the vacuum degree of the vacuum heat insulation layer 201 can be maintained higher.

  Further, since the second pipe 192 of the heat insulating structure 190 is thick, the rigidity of the heat insulating structure 190 constituting the outer portion of the fuel cell module M can be improved.

  Further, since the radiant heat reflecting material 203 is provided in the vacuum heat insulating layer 201, the radiant heat from the fuel processing apparatus main body 120 can be reflected by the radiant heat reflecting material 203. Thereby, heat insulation can be improved.

  Further, at the upper end portion and the lower end portion of the heat insulating structure 190, there are extension portions 194 and 195 that protrude upward and downward with respect to the reforming portion 132, the combustion portion 133, and the accommodating portion 134, which are high temperature portions, respectively. The extension portions 194 and 195 are filled with heat insulating materials 214 and 215, respectively. Therefore, the heat of the high temperature part can be prevented from escaping from the upper end part and the lower end part of the heat insulating structure 190. Thereby, heat insulation can be improved more.

  In addition, since the heat insulating structure 190 has a double multi-tube structure and is integrated with the fuel processing apparatus main body 120, the multi-tube structure 240 including the fuel processing apparatus main body 120 and the heat insulating structure 190 is manufactured. This heat insulating structure 190 can be assembled integrally with the fuel processor main body 120. Thereby, for example, as compared with the case where the heat insulating structure 190 is separate from the fuel processing apparatus main body 120, the number of assembling steps can be reduced, and the cost can be reduced.

  Moreover, since the outer peripheral part of the reforming part 132, the combustion part 133, and the accommodating part 134 which are high temperature parts is covered with the heat insulating structure 190 including the vacuum heat insulating layer 201, the high temperature part requiring high heat insulation is used. On the other hand, high heat insulation can be exhibited.

  Moreover, although the outer peripheral part of the vaporization part 131 which is a low temperature part is covered with the upper heat insulating material 214, since the low temperature part does not require high heat insulation, the thickness of the upper heat insulating material 214 may be thin. Thereby, size reduction is realizable.

  Furthermore, since it is not necessary to cover the outer peripheral part of the vaporization part 131 which is a low temperature part with the vacuum heat insulation layer 201, the freedom degree of design of the fuel processing apparatus main body 120 including a high temperature part and a low temperature part can be raised.

  Next, a modification of the second embodiment of the present invention will be described.

  As shown in FIG. 7, in the second embodiment described above, the gas adsorbent 200 may be sealed in the vacuum heat insulating layer 201. As described above, when the gas adsorbent 200 is sealed in the vacuum heat insulating layer 201, the gas that has entered the vacuum heat insulating layer 201 can be adsorbed by the gas adsorbent 200. Thereby, the vacuum degree of the vacuum heat insulation layer 201 can be maintained higher.

  In the second embodiment described above, the fuel processor main body 120 has a triple multi-pipe structure having a fuel gas flow channel 151 and a combustion exhaust gas flow channel 153. Any structure may be used as long as it has a multi-tube structure having a fuel gas channel 151 through which a fuel gas mainly composed of hydrogen flows.

  In the second embodiment described above, the heat insulating structure 190 has the vacuum heat insulating layer 201 between the first pipe 191 and the second pipe 192 and the air flow path 202 inside the second pipe 192. Although it is a double multi-pipe structure, if it is a multi-pipe structure which has the vacuum heat insulation layer 201 between the 1st pipe | tube 191 and the 2nd pipe | tube 192, and has the air flow path 202 inside the 2nd pipe | tube 192, Any structure is acceptable.

  In the second embodiment described above, the heat insulating structure 190 is integral with the fuel processor main body 120, and the air flow path 202 includes the second pipe 192 of the heat insulating structure 190 and the first of the fuel processor main body 120. It is formed between one pipe 121. However, the heat insulating structure 190 is a triple multi-tube structure that is separate from the fuel processor main body 120, and has a vacuum heat insulating layer 201 between the first pipe 191 and the second pipe 192 and the second pipe 192. An air flow path 202 may be provided between the inner third pipe.

  Further, when the heat insulating structure 190 is a separate body from the fuel processing apparatus main body 120, a heat insulating material may be filled between the fuel processing apparatus main body 120 and the heat insulating structure 190.

  In the second embodiment described above, the second pipe 192 of the heat insulating structure 190 is preferably configured to be thicker than the first pipe 191 of the heat insulating structure 190. If the permeation can be prevented, the second pipe 192 of the heat insulating structure 190 may be the same thickness as the first pipe 191 of the heat insulating structure 190 or may be thinner than the first pipe 191.

  In the second embodiment described above, the vacuum heat insulating layer 201 is preferably provided with the radiant heat reflecting material 203, but the radiant heat reflecting material 203 may be omitted.

  In the second embodiment described above, the fuel cell module M may be constructed by combining the fuel processing device 10 according to the first embodiment described above and the fuel cell stack 230.

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to the above, and various modifications can be made without departing from the spirit of the present invention. Of course there is.

(First embodiment)
DESCRIPTION OF SYMBOLS 10 ... Fuel processing apparatus, 20 ... Fuel processing apparatus main body, 21 ... First pipe (first pipe from the outside), 22 ... Second pipe (second pipe from the outside), 23 ... Third pipe (three from the outside) ), 24... Fourth tube (fourth tube from the outside), 31... Fuel gas channel, 32. Fuel treatment channel, 33. Combustion exhaust gas channel, 34. Combustion chamber, 35. , 36 ... shift catalyst layer, 37 ... selective oxidation catalyst layer, 41 ... reforming section, 42 ... carbon monoxide reduction section, 51 ... reforming water introduction pipe, 52 ... raw fuel introduction pipe, 53 ... selective oxidation air introduction Pipe ... 54 ... Fuel gas delivery pipe, 60 ... Burner, 61 ... Fuel introduction pipe, 62 ... Combustion air introduction pipe, 63 ... Combustion exhaust gas discharge pipe, 64 ... Wiring member, 70 ... Thermal insulation structure, 71 ... First pipe ( First tube from outside), 72 ... Second tube (second tube from outside), 73 ... Third tube (third tube from outside) , 74, 75 ... Extension, 81 ... Vacuum heat insulating layer, 82 ... Air flow path, 83 ... Radiant heat reflecting material, 84 ... Air introduction pipe, 90 ... Heat insulating material, 94 ... Upper end, 95 ... Lower end, 100 ... Gas adsorbent.
(Second embodiment)
DESCRIPTION OF SYMBOLS 110 ... Fuel processing apparatus, 120 ... Fuel processing apparatus main body, 121 ... First pipe (first pipe from the outside), 122 ... Second pipe (second pipe from the outside), 123 ... Third pipe (three from the outside) The second pipe), 131 ... the vaporizing section, 132 ... the reforming section, 133 ... the combustion section, 134 ... the housing section, 135 ... the combustion chamber, 136 ... the heat insulation space, 137 ... the taper section, 141 ... the vaporization flow path, 151 ... fuel. Gas passage, 152 ... reforming catalyst layer, 153 ... combustion exhaust gas passage, 161 ... raw fuel introduction pipe, 162 ... combustion exhaust gas discharge pipe, 171 ... ignition electrode, 172 ... pipe, 173 ... conductive part, 181 ... partition wall part 182 ... communication hole, 183 ... rectifying member, 184 ... fuel gas supply pipe, 185 ... hole, 190 ... heat insulation structure, 191 ... first pipe (first pipe from outside), 192 ... second pipe (from outside) Second tube), 194, 195 ... extension, DESCRIPTION OF SYMBOLS 00 ... Gas adsorbent, 201 ... Vacuum heat insulation layer, 202 ... Air flow path, 203 ... Radiant heat reflection material, 204 ... Air introduction pipe, 214, 215 ... Heat insulation material, 230 ... Fuel cell stack, 231 ... Cell, 232 ... Fuel gas inlet port, 233... Air inlet port, 234 .. wiring member, 240 .. multiple tube structure, 241... Base member, 242.

Claims (8)

A fuel processing apparatus main body having a multi-tube structure and having a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first pipe and the second pipe from the outside,
It has at least a double multi-tube structure provided outside the fuel processor main body, and has a vacuum heat insulating layer between the first tube and the second tube from the outside, and two from the outside. A heat insulating structure having an air flow path that is in communication with the air introduction port of the combustion chamber or the fuel cell stack of the fuel processor main body and through which the air flows, inside the second pipe ;
With
The fuel processing apparatus , wherein the second tube from the outside in the heat insulation structure is thicker than the first tube from the outside in the heat insulation structure . A fuel processing apparatus main body having a multi-tube structure and having a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first pipe and the second pipe from the outside,
A vacuum heat insulating layer having at least a double multi-tube structure provided outside the fuel processor main body and having a gas adsorbent sealed between the first tube and the second tube from the outside. And a heat insulating structure having an air flow path that is in communication with the air introduction port of the combustion chamber of the fuel processor main body or the fuel cell stack, inside the second pipe from the outside, and through which the air flows.
A fuel processing apparatus comprising: A fuel processing apparatus main body having a multi-tube structure and having a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first pipe and the second pipe from the outside,
It has at least a double multi-tube structure provided outside the fuel processor main body, and has a vacuum heat insulating layer between the first tube and the second tube from the outside, and two from the outside. A heat insulating structure having an air flow path that is in communication with the air introduction port of the combustion chamber or the fuel cell stack of the fuel processor main body and through which the air flows;
With
The fuel processor main body has a high temperature portion where the temperature is relatively higher than the surrounding portion,
Extension portions projecting in the axial direction of the heat insulating structure with respect to the high temperature portion are respectively formed at both axial end portions of the heat insulating structure,
A fuel processing apparatus, wherein each extension portion is filled with a heat insulating material. The heat insulating structure is a separate body from the fuel processor main body,
Between the fuel processor main body and the heat insulating structure, a heat insulating material is filled,
The fuel processor as described in any one of Claims 1-3. A fuel processing apparatus main body having a multi-tube structure and having a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first pipe and the second pipe from the outside,
It has at least a double multi-tube structure provided outside the fuel processor main body, and has a vacuum heat insulating layer between the first tube and the second tube from the outside, and two from the outside. A heat insulating structure having an air flow path that is in communication with the air introduction port of the combustion chamber or the fuel cell stack of the fuel processor main body and through which the air flows, inside the second pipe;
With
The heat insulating structure is integral with the fuel processor main body,
Between the second tube from the outside in the heat insulation structure and the first tube from the outside in the fuel processor main body, the air flow path is formed,
The fuel processing apparatus main body includes a high temperature portion having a temperature relatively higher than a surrounding portion, and a low temperature portion that is provided alongside the high temperature portion in an axial direction of the high temperature portion and at a lower temperature than the high temperature portion. Have
The outer peripheral part of the high temperature part is covered with the heat insulating structure,
The fuel processing apparatus , wherein an outer peripheral portion of the low temperature portion is covered with a heat insulating material . The vacuum heat insulating layer is provided with a radiant heat reflecting material,
The fuel processing apparatus as described in any one of Claims 1-5. The fuel processor according to any one of claims 1 to 6,
A fuel cell stack disposed alongside the fuel processor in the axial direction of the fuel processor and generating electric power by an electrochemical reaction between fuel gas and air supplied through the fuel gas passage and the air passage;
A fuel cell module comprising: A fuel processing apparatus main body having a multi-tube structure and having a fuel gas passage through which a fuel gas mainly composed of hydrogen flows between the first pipe and the second pipe from the outside, and the fuel processing apparatus main body And at least a double multi-tube structure provided outside, and having a vacuum heat insulating layer between the first tube and the second tube from the outside, and the inside of the second tube from the outside And a heat insulating structure having an air flow path that is communicated with an air inlet of the fuel cell stack and through which air flows, and a fuel processing device comprising:
A fuel cell stack disposed alongside the fuel processor in the axial direction of the fuel processor and generating electric power by an electrochemical reaction between fuel gas and air supplied through the fuel gas passage and the air passage;
A fuel cell module comprising:

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