JP2008192435A - Reforming unit, and fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system capable of efficiently stably reforming in simple structure. <P>SOLUTION: A reforming unit 300 of the fuel cell system is equipped with a reformer 620; a reforming outer packaging case 610 in which a CO transformer 820 and a selective CO oxidizing device 830 are housed; a piping outer packaging case 710; a CO removing outer packaging case 810; a plurality of block-shaped heat insulating materials 511B installed along the outer peripheral surfaces of the reforming outer packaging case 610, the piping outer packaging case 710, and the CO removing outer packaging case 810; and a shell 540 covering the outer peripheral surfaces of the heat insulating materials 511B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reforming unit that generates a reformed gas containing hydrogen gas by heating a source gas containing a hydrocarbon feedstock with a combustion gas of a burner, and a fuel cell system including the reforming unit.

  2. Description of the Related Art Conventionally, for example, in a fuel cell system, various reformers are known that generate hydrogen gas by reforming with a reforming catalyst while heating a supplied raw material gas with a burner. These reformers have a multi-tube structure with multiple annular gaps in the radial direction, and a structure is adopted in which the raw material gas mixed with water vapor is heated and heated by combustion of a burner disposed at a substantially central position. (For example, see Patent Document 1 to Patent Document 7).

In the device disclosed in Patent Document 1, a cylindrical heat transfer partition is provided in a state surrounding the burner with a central axis on which the burner disposed by the burner mounting base is located, and the first is concentrically outside the heat transfer partition. A plurality of cylinders from the cylinder to the eighth cylinder are sequentially arranged. The lower end of the first cylinder is closed by a heat transfer partition and a bottom plate through a gap, and the lower end of the third cylinder is closed by a bottom plate facing the bottom plate of the first cylinder through a gap, and the first cylinder And between the 2nd cylinder and the channel | path of a 2nd cylinder and a 3rd cylinder communicates in the lower part.
A supply port to which water is supplied is communicated between the exhaust passage connected to the exhaust port of the combustion exhaust gas, which is partitioned between the heat transfer partition and the first cylindrical body, and whose upper end opens to the outer peripheral side, and the burner mounting base. A water heating path is formed. Between the first cylinder and the second cylinder, an upper portion communicates with a supply port to which the source gas is supplied, and a blade is provided in a spiral shape so that the source gas flows in a spiral shape. A preheating layer filled with a filler is provided on the upper side in the passage, a reforming catalyst layer is provided on the lower side, and the lower part is provided with a reforming catalyst layer connected to the passages of the second cylinder and the third cylinder. ing. A gap filled with a heat insulating material is formed between the third cylinder and the fourth cylinder.
Between the fourth cylinder and the fifth cylinder, the upper end is connected to the reforming catalyst layer and is filled with a CO shift catalyst to form a shift layer. A sixth cylinder is interposed between the fifth cylinder and the seventh cylinder, and a heating passage is formed which communicates with the source gas supply port and whose downstream side communicates with the upper portion of the preheating layer. Between the seventh cylinder and the eighth cylinder is partitioned by a partition plate so that gas can flow, and the lower part is filled with a CO removal catalyst through a mixing chamber that communicates with the lower part of the shift layer and introduces air. The first PROX layer and the second PROX layer that communicates with the first PROX layer and communicates with the reformed gas outlet are employed.

In Patent Document 2, a cylindrical heat transfer partition is provided in a state of surrounding the burner with a central axis on which the burner disposed by the burner mounting base is located, and the first is concentrically outside the heat transfer partition. A plurality of cylinders from the cylinder to the eighth cylinder are sequentially arranged. The lower end of the first cylinder is closed by a heat transfer partition and a bottom plate through a gap, and the lower end of the third cylinder is closed by a bottom plate facing the bottom plate of the first cylinder through a gap, and the first cylinder And between the 2nd cylinder and the channel | path of a 2nd cylinder and a 3rd cylinder communicates in the lower part.
A supply port to which water is supplied is communicated between the exhaust passage connected to the exhaust port of the combustion exhaust gas, which is partitioned between the heat transfer partition and the first cylindrical body, and whose upper end opens to the outer peripheral side, and the burner mounting base. A water heating path is formed. Between the first cylinder and the second cylinder, the upper part communicates with the supply port to which the raw material gas is supplied, the preheating layer filled with the filler is provided on the upper side, and the reforming catalyst is filled on the lower side A reforming catalyst layer having a lower portion connected to the passages of the second and third cylinders is provided. A gap filled with a heat insulating material is formed between the third cylinder and the fourth cylinder.
Between the fourth cylinder and the fifth cylinder, the upper end is connected to the reforming catalyst layer and is filled with a CO shift catalyst to form a shift layer. A sixth cylinder is interposed between the fifth cylinder and the seventh cylinder, and a heating passage is formed which communicates with the source gas supply port and whose downstream side communicates with the upper portion of the preheating layer. Between the seventh cylinder and the eighth cylinder, the lower part communicates with the lower part of the shift layer and is partitioned by a partition plate through a chamber in which air is introduced and filled with a CO removal catalyst. A 1 PROX layer is formed. In addition, a plurality of chambers are formed between the seventh cylinder and the eighth cylinder by a partition plate through which the gas can flow in a state in which the gas generates a turbulent flow in the flow process. A configuration is adopted in which a second PROX layer is formed which communicates with the first PROX layer and communicates with the reformed gas outlet through the chamber.

In Patent Document 3, a cylindrical heat transfer partition is provided in a state of surrounding the burner with a central axis on which the burner disposed by the burner mount is located, and the first is concentrically outside the heat transfer partition. A plurality of cylinders from the cylinder to the eighth cylinder are sequentially arranged. The lower end of the first cylinder is closed by a heat transfer partition and a bottom plate through a gap, and the lower end of the third cylinder is closed by a bottom plate facing the bottom plate of the first cylinder through a gap, and the first cylinder And between the 2nd cylinder and the channel | path of a 2nd cylinder and a 3rd cylinder communicates in the lower part. The lower ends of the fourth cylinder and the eighth cylinder are joined by a bottom plate.
The upper end of the exhaust passage of the annular space defined between the heat transfer partition and the first cylinder communicates with a combustion exhaust gas outlet opening to the outer peripheral side. The passage between the first cylinder and the second cylinder has an upper part communicating with a supply port to which a raw material gas obtained by mixing water and city gas is supplied, and a lower part between the second cylinder and the third cylinder. Are connected to the reforming catalyst layer filled with the reforming catalyst. A gap is formed between the third cylinder and the fourth cylinder.
Between the fourth cylinder and the fifth cylinder, the upper end is connected to the reforming catalyst layer and is filled with a CO shift catalyst to form a shift layer. A shift layer connected between the fourth cylinder and the fifth cylinder is formed in the lower part between the seventh cylinder and the eighth cylinder, and mixed with air mixed by being partitioned by a partition plate on the upper part of the shift layer. A chamber is defined, and a PROX layer filled with a CO selective oxidation catalyst that communicates with the outlet of the reformed gas is formed in the upper portion of the mixing chamber. A sixth cylinder is interposed between the fifth cylinder and the seventh cylinder, and communicates with the supply port, and the downstream side heats the source gas connected to the upper part of the passage between the first cylinder and the second cylinder. A heating path is formed. A drainage device for discharging the water accumulated inside is provided at the lower part where the shift layer between the fourth and fifth cylinders and the shift layer between the seventh and eighth cylinders are connected. Configuration is adopted.

In the device disclosed in Patent Document 4, a cylindrical heat transfer partition is provided in a state of surrounding the burner with a central axis where the burner to be disposed is located, and concentrically on the outer side of the heat transfer partition from the first cylinder. A plurality of cylinders up to 8 cylinders are sequentially arranged. The lower end of the first cylinder is closed by a heat transfer partition and a bottom plate through a gap, and the lower end of the third cylinder is closed by a bottom plate facing the bottom plate of the first cylinder through a gap, and the first cylinder And between the 2nd cylinder and the channel | path of a 2nd cylinder and a 3rd cylinder communicates in the lower part. The lower ends of the fourth cylinder and the eighth cylinder are joined by a bottom plate.
The upper end of the ascending passage of the annular space defined between the heat transfer partition and the first cylindrical body communicates with an annular intermediate passage in the horizontal direction and extends downward from the outer periphery of the intermediate passage to the combustion exhaust gas outlet at the lower end. A connecting circular descending passage is provided. Adjacent to the outer periphery of the descending passage, a circular water supply preheating portion is provided which has a water supply port at the lower end and preheats the supplied water. At the upper end of the feed water preheating part, a connecting part connected to an annular chamber to which a raw material gas supply port is connected and raw material gas and wet steam are supplied is provided. A tubular raw material preheating portion is provided adjacent to the inner peripheral side of the descending passage. Between the first cylinder and the second cylinder, a heating passage connected to the annular chamber is connected to the upper part, a preheating layer filled with a filler such as stainless steel or alumina is provided at the upper part, and the reforming catalyst is provided at the lower part. A filled reforming catalyst layer is provided.
A heat insulating material is filled between the third cylinder and the fourth cylinder, and an upper end communicates with the passage between the fourth cylinder and the fifth cylinder, and a CO shift catalyst is filled to form a shift layer. . A sixth cylinder is interposed between the fifth cylinder and the seventh cylinder to form a double tube structure, and the source gas supplied from the source gas supply port and the water supplied from the water supply port are mixed The heating passage which passes in the state and was connected to the preheating layer is formed. Between the seventh cylinder and the eighth cylinder, the lower part is filled with a CO removal catalyst that communicates with the lower part of the shift layer and air is introduced, and the first PROX layer is partitioned by the partition plate on the upper part of the first PROX layer. The structure which formed the made 2nd PROX layer is taken.

Patent Document 5 describes a reforming tube having at least a lower part covered with a furnace vessel, an upright partitioning cylinder, and a concentric ring arranged inside and outside the partitioning cylinder, with the lower part separated from the lower end of the partitioning cylinder. The inner cylinder and the outer cylinder connected with a bottom plate are formed into a double annular structure. The reforming pipe has a source gas inlet formed between the partitioning cylinder and the outer cylinder via a source gas manifold at the top, and a lower end communicating with an inner annular space defined between the partitioning cylinder and the inner cylinder. An outer annular space is defined.
The inner annular space is filled with a granular reforming catalyst, and a reformed gas outlet is formed in the upper part via a reformed gas manifold. The combustion gas burned by the burner is exhausted from the inner cylinder of the reforming pipe through the gap between the lower end of the reforming pipe and the inner peripheral side of the furnace vessel. When the combustion gas is exhausted, the raw material gas flowing into the outer annular space is heated, and flows into the inner annular space to be reformed by the granular reforming catalyst.

The one described in Patent Document 6 is provided with a combustion cylinder having a concentric opening in the vicinity of the lower end and a burner disposed in a state where a burner forms a downward flow flame in a bottomed cylindrical partition wall. A vertical columnar first region is defined on the inner side of the cylinder, and an annular second region is formed concentrically with the first region and located on the outer peripheral side of the first region and communicated through the opening of the combustion cylinder. is doing.
In the second region, a plurality of reforming pipes having a double pipe structure and filled with a reforming catalyst on the outer peripheral side are arranged along the axial direction in a state of being positioned on the circumference. A raw material gas manifold is connected to the upper end portion of each reforming pipe in a state where the outer peripheral side communicates.
An annular third region that is concentric and has an upper end communicating with the second region is formed on the outer peripheral side of the second region, and an annular fourth region is formed concentrically on the outer peripheral side of the third region. In the third region, a water evaporation pipe for generating water vapor from the supplied water by the combustion gas of the burner flowing through the second region is arranged in a spiral shape substantially concentrically with the first region. In the fourth region, a high-temperature CO converter filled with a high-temperature CO (carbon monoxide) conversion catalyst connected to a reformed gas manifold connected to each communication portion communicating with the inner peripheral side of the reforming pipe, a low-temperature CO The transformer and the first and second selective oxidizers filled with the selective oxidation catalyst are partitioned in a state of being arranged in the circumferential direction.
Then, the raw material gas mixed with the water vapor generated in the water evaporation pipe by the combustion gas of the burner flowing into the third region from the first region through the second region is fed from the raw material gas manifold to the outer peripheral side of each reforming tube. Flow into. Furthermore, the raw material gas is reformed by the reforming catalyst while being heated by the combustion gas of the burner flowing into the second region, and the high temperature CO converter, the low temperature CO converter, The structure processed by the 1st selective oxidizer and the 2nd selective oxidizer is taken.

  Patent Document 7 describes a reformer and related equipment such as a desulfurizer, a water evaporator, a raw fuel vaporizer, a low-temperature shift converter, and a selective oxidation CO remover as one unit configuration, and a vacuum insulated container It is arranged inside. The combustion gas of the combustor flows through the inner space of the vacuum heat insulating container. Around the combustor, a reforming pipe having a double pipe structure consisting of an inner pipe and an outer pipe is filled with a reforming catalyst in which a raw material gas is passed through the inner pipe and the outer pipe, and the reformed gas is passed through the inner pipe. Are arranged in plural.

JP 2002-187705 A JP 2002-293509 A JP 2003-112904 A JP 2004-123464 A JP-A-5-303972 JP 2004-288434 A JP 2003-327405 A

By the way, in a fuel cell system, energy efficiency is important. In the process of producing hydrogen gas to be supplied to the fuel cell, the heating at the time of reforming requires relatively large energy in all the processes. Therefore, it is necessary to efficiently heat and perform the reforming treatment.
In particular, there is a strong demand for suppression of a decrease in energy efficiency and further improvement in energy efficiency when reducing the size and simplifying the configuration for general household use.

  In view of the above, an object of the present invention is to provide a reforming unit and a fuel cell system capable of obtaining an efficient and stable reforming process with a simple structure.

The reforming unit of the present invention includes a reformer that generates a reformed gas containing hydrogen gas (H ₂ ) by heating a feed gas containing a hydrocarbon feedstock with a combustion gas of a burner in a reforming catalyst; A CO converter that is supplied with the reformed gas generated by the reformer and converts carbon monoxide (CO) in the reformed gas into carbon dioxide (CO ₂ ) by a CO shift catalyst, and a CO converter A reforming unit comprising: a CO selective oxidizer that is supplied with the treated reformed gas and that oxidizes CO remaining in the reformed gas to CO ₂ by a CO selective oxidation catalyst; A case body that houses the CO transformer and the CO selective oxidizer, a substantially block-shaped heat insulating member provided along an outer peripheral surface of the case body, and an outer peripheral surface of the heat insulating member; A cap for reinforcing the heat insulating member Characterized by comprising a chromatography plate, a.
According to this invention, since the cover plate which covers the outer peripheral surface of a heat insulation member is provided, the heat radiation from a heat insulation member can be suppressed. Moreover, a heat insulation part can be appropriately hold | maintained in a heat insulation heat retention position with a cover plate. Therefore, the heat insulation effect by a heat insulation part can be improved more, and the thermal efficiency in a modification process can be improved more. Furthermore, since the heat insulating member is protected by the cover plate, even if an external force such as an impact is applied, the external force can be absorbed by the cover plate and the heat insulating member can be prevented from being damaged.

And in this invention, it is a modification | reformation unit of Claim 1, Comprising: The said heat insulation member is continuously arranged in the state which covers the outer peripheral surface of the said case body along the outer peripheral surface of the said case body, It is preferable that a cover plate is provided along the outer peripheral surface of each said heat insulation member.
According to this invention, a plurality of heat insulating members are continuously arranged along the outer peripheral surface of the case body, and the cover plate is provided so as to cover the outer peripheral surfaces of these heat insulating members.
For this reason, it is possible to easily combine adjacent heat insulating members by, for example, welding the cover plates, and the cover plates can be easily removed by removing the respective heat insulating members. It can be easily dismantled.

Moreover, in this invention, it is a modification | reformation unit of Claim 1 or Claim 2, Comprising: It is preferable that the said cover plate is integrally provided in the said heat insulation member.
According to this invention, the cover plate is integrally provided on the heat insulating member. Thus, the cover plate can be more easily attached in a state of covering the outer peripheral surface of the heat insulating member simply by attaching the heat insulating member integrally provided with the cover plate along the outer peripheral surface of the case body. Therefore, the heat insulating member of the reforming unit can be assembled and disassembled more easily, and maintenance of the reforming unit can be performed more easily. Moreover, by providing a cover plate integrally with each heat insulation member, the adhesiveness of a heat insulation member and a cover plate can be ensured, and reinforcement of each heat insulation member can be implemented reliably. Moreover, the heat insulation effect in each heat insulation member can be improved more.

Furthermore, in this invention, it is a modification | reformation unit of Claim 1, Comprising: The said heat insulation member is continuously arranged in the state which covers the outer peripheral surface of the said case body along the outer peripheral surface of the said case body, The cover plate may be configured to be formed in a substantially cylindrical shape in which a substantially plate-like member is bent so as to cover the outer peripheral surfaces of the plurality of heat insulating members, and the edges of the plate-like members are connected to each other.
In this invention, the cover plate is formed in a substantially cylindrical shape by bending a single plate-like member so as to cover the outer peripheral surfaces of the plurality of heat insulating members and joining the edges. For this reason, a plurality of heat insulation members can be pressed to the case body side by this cover plate, and a heat insulation member can be stuck to a case body more certainly. Therefore, the heat insulation of the reforming unit can be improved. In addition, since the gap between the heat insulating members adjacent to each other can be covered with the cover plate, heat dissipation from the heat insulating member can be more reliably prevented. Furthermore, the outer peripheral surface of the heat insulating member can be aligned with the plate surface of the cover plate, and the exterior shape of the reforming unit can be improved.

In the present invention, the reforming unit according to claim 1, wherein the case body is formed in a substantially cylindrical shape, and the cover plate is formed in a substantially cylindrical shape surrounding an outer peripheral surface of the case body. The heat insulating member may be formed by filling a space between the case body and the cover plate with a heat insulating material.
In this invention, the heat insulating member is formed by filling the gap between the case body and the cover plate with the heat insulating material. In this invention, the heat insulating material of the reforming unit can be easily formed by pouring and fixing a heat insulating material between the case body and the cover plate, for example, and the heat dissipation of the heat insulating member can be prevented by the cover plate. it can.

Furthermore, in this invention, it is the modification | reformation unit in any one of Claim 1 thru | or 5, Comprising: While the said case body is formed in a substantially cylindrical shape, it protrudes outward at the cylinder one end part, and the said A heat insulating material supporting portion having a mounting portion for holding one end surface of the heat insulating member and an outer peripheral holding portion for holding an outer peripheral side surface of the heat insulating member; It is preferable that the contact is fixed.
According to the present invention, the cover plate and the heat insulating member can be easily held by fixing the cover plate to the outer periphery holding portion of the heat insulating material support portion provided at one end of the case body. Moreover, the positioning of the end portion of the case body and the end portion of the heat insulating member is facilitated, and the productivity can be improved. Moreover, since a heat insulation member can be appropriately arrange | positioned in a required site | part, heat insulation is also improved.

And in this invention, it is the modification | reformation unit in any one of Claim 1 thru | or 6, Comprising: It is preferable that the said cover plate was formed with the metal member.
According to this invention, the cover plate is formed of a metal member. Thereby, the cover plates adjacent to each other can be easily connected by welding or the like, the manufacturability can be improved, and the heat insulating member can be reliably reinforced.

A fuel cell system according to the present invention includes a reforming unit according to any one of claims 1 to 7, an oxygen-containing gas supply means for supplying an oxygen-containing gas, and the reforming unit. And a fuel cell that generates electric power using the oxygen-containing gas supplied by the reformed gas and the oxygen-containing gas supply means.
In the present invention, power is generated in the fuel cell by the reformed gas generated by the reforming unit according to any one of claims 1 to 3 and the oxygen-containing gas supplied by the oxygen-containing gas supply means.
This makes it possible to provide a small system configuration that can generate power efficiently and stably, making it easy to use for home use, and easily expanding the use.

[Configuration of fuel cell system]
Hereinafter, an embodiment according to the fuel cell system of the present invention will be described.
In the present embodiment, the configuration of the fuel cell system including the reforming unit of the present invention is illustrated. However, the configuration is not limited to the configuration used for the fuel cell system, and for example, as a hydrogen gas production apparatus, the reforming unit alone is used. It may be configured. Moreover, although the structure which uses liquid fuel is illustrated as raw material gas with which water vapor | steam is mixed, it is not restricted to liquid fuel, For example, it mixes water vapor | steam using hydrocarbon raw material gas, such as liquefied petroleum gas and city gas, and raw material gas The present invention can also be applied to a configuration using various hydrocarbon raw materials such as a configuration to be prepared. Furthermore, although the system configuration for homes is exemplified, the present invention can be applied to a relatively large system configuration used for, for example, an apartment house or various stores.
FIG. 1 is a block diagram showing a schematic configuration of a fuel cell system in the present embodiment. FIG. 1 shows the configuration of the reforming unit in separate blocks for convenience of explanation.

(overall structure)
In FIG. 1, reference numeral 100 denotes a fuel cell system. The fuel cell system 100 is a system in which, for example, liquid fuel is used as a raw material to be reformed into a fuel gas containing hydrogen as a main component, and the fuel cell 200 generates power.
The fuel cell system 100 includes a liquid fuel storage tank 110 that stores liquid fuel 111, for example, kerosene. Here, the liquid fuel 111 is not limited to kerosene, and various liquid fuels such as light oil and naphtha can be used. A desulfurizer 130 is connected to the liquid fuel storage tank 110 via a fuel conveyance path 120 that includes a liquid fuel pump 121 and conveys the liquid fuel 111.
The desulfurizer 130 contains the liquid fuel 111 supplied from the liquid fuel storage tank 110 via the fuel transfer path 120 at, for example, about 300 [ml / hour] in the liquid fuel 111 by a desulfurization process, that is, a liquid phase adsorption method. The sulfur compound is adsorbed and removed while heating with an electric heater or the like. A reforming unit 300 is connected to the desulfurizer 130.

Although the details will be described later, the reforming unit 300 includes a vaporizer, a heat exchange device, a reformer, a CO converter, a CO selective oxidizer, and the like.
The vaporizer is connected to the desulfurizer 130, and the liquid fuel 111 that has been subjected to the desulfurization process is introduced into the vaporizer. Moreover, the heat exchanger is connected to the vaporizer. The vaporizer mixes and vaporizes the water vapor supplied from the heat exchange device with the liquid fuel 111 flowing out from the desulfurizer 130, and converts the vaporized liquid fuel as a raw material gas, which is a mixed gas of the liquid fuel 111 and the water vapor, into the vaporizer. Generate.
A pure water tank 180 for storing pure water 181 is connected to the heat exchange device via a water supply path 183 having a transport pump 182, and pure water 181 is supplied from the pure water tank 180. Then, the heat exchange device cools the exhaust gas exhausted from the reformer by the supplied pure water 181 and generates water vapor, and supplies the generated water vapor to the vaporizer. The pure water tank 180 may be configured to store pure water 181 that does not contain impurities such as distilled water and to supply, for example, tap water or the like after being purified.
Although the details of the vaporizer and the heat exchange device will be described later, a configuration integrated with the reformer, that is, a configuration in which the reforming unit 300 is integrated into an integral unit is illustrated, but another configuration may be used.

The reformer reforms the vaporized liquid fuel that has been desulfurized and mixed with water vapor into a hydrogen-rich fuel gas. This reformer includes a reformer catalyst such as a Ru-based catalyst and a nickel catalyst (not shown) and a burner unit 151 as a burner. The heating device is not limited to the burner unit 151, and various heating devices such as an electric heater can also be used.
The burner unit 151 is supplied with the liquid fuel 111 from the liquid fuel storage tank 110 via the branched fuel conveyance path 120 and also with the fuel gas discharged from the fuel cell 200 described later. The burner unit 151 combusts the liquid fuel 111 and the fuel gas by the air supplied from the air supply blower 170, and steam-reforms the vaporized liquid fuel into hydrogen-rich fuel gas by the heat generated by the combustion.
High-temperature exhaust gas generated by the combustion of the burner unit 151 is supplied to a heat exchange device, cooled by heat exchange with water, and exhausted into the outside air.

In addition, a CO converter and a CO selective oxidizer are connected in series to the reformer of the reforming unit 300.
The CO converter is charged with a CO conversion catalyst and converts carbon monoxide (CO) contained in the hydrogen-rich fuel gas flowing out from the reformer.
The CO selective oxidizer is filled with a CO selective oxidation catalyst, oxidizes the remaining CO without being converted by the CO converter to carbon dioxide (CO ₂ ), and removes CO in the fuel gas.
Although the CO converter and the CO selective oxidizer will be described in detail later, the reformer and the reformer unit 300 are illustrated as an integral configuration, that is, an example of an integral unit configuration as the reformer and the reforming unit 300. You may make it the structure assembled | attached integrally. In addition to the CO converter and the CO selective oxidizer, a device for adsorbing and removing CO is provided separately, or a device for adsorbing and removing CO is provided in place of the CO converter and the CO selective oxidizer. May be.

The fuel cell 200 is connected to the CO selective oxidizer by piping or the like.
The fuel cell 200 reacts hydrogen and oxygen to generate DC power. The fuel cell 200 is, for example, a solid polymer fuel cell, and includes a positive electrode 201, a negative electrode 202, and a polymer electrolyte membrane (not shown) disposed between the positive electrode 201 and the negative electrode 202. For example, air appropriately humidified by a humidifier (not shown) is supplied to the positive electrode 201 side, and hydrogen-rich fuel gas generated by the reforming unit 300 is supplied to the negative electrode 202 side. Then, hydrogen (fuel gas) and oxygen in the air react to generate water (pure water 181), and DC power is generated between the positive electrode 201 and the negative electrode 202.
The fuel gas supplied from the reforming unit 300 may be appropriately humidified and supplied via a humidifier as necessary. Further, the humidifier can be used in various forms such as being installed independently as a system configuration or a unit configuration built in the fuel cell 200.
The negative electrode 202 side is connected to the burner unit 151 of the reformer as described above, and surplus hydrogen is supplied as fuel for the burner unit 151. A separator 185 is connected to the positive electrode 201 side. The separator 185 is supplied with air used for the reaction from the positive electrode 201 side, and is separated into air for the gas phase and water (pure water 181) for the liquid phase. The separated air is exhausted to the outside air. The separator 185 is connected to a pure water tank 180 and supplies the separated water (pure water 181) to the pure water tank 180.

The fuel cell 200 is provided with a cooling device 187. The cooling device 187 is provided with a heat recovery unit 187A attached to the fuel cell 200. A pure water tank 180 is connected to the heat recovery unit 187A via a circulation path 187D including a pump 187B and a heat exchanger 187C.
The circulation path 187D circulates the pure water 181 between the heat recovery unit 187A and the pure water tank 180 by driving the pump 187B, cools the fuel cell 200 that generates heat accompanying power generation, and recovers heat.
The heat exchanger 187C exchanges heat with the pure water 181 that has been circulated and recovered heat by the heat recovery unit 187A, for example, tap water. The tap water warmed by this heat exchange is directly supplied to other facilities such as a bath for effective use. In addition to heat exchange with tap water, it may be used effectively for other facilities such as generating electricity from heat obtained by heat exchange.
Note that the heat exchanger 187C is not only configured to exchange heat by directly flowing tap water, but, for example, water that exchanges heat with air flowing from the positive electrode 201 of the fuel cell 200 to the separator 185 with a heat exchange device (not shown). A configuration may be employed in which water exchanges heat with pure water 181.

The fuel cell system 100 includes a control device (not shown) that controls the operation of the entire system.
This control device controls the flow rate of the liquid fuel 111, controls the power supplied to the electric heater, which is the heating condition of the heating means of the desulfurizer 130, controls the combustion of the burner unit 151 of the reformer, and generates steam with the heat exchange device 160 For example, the supply amount control of the pure water 181 for controlling the temperature, the temperature management, and the power generation amount management are performed.

(Reforming unit)
Next, the configuration of the reforming unit 300 in the fuel cell system 100 described above will be described in detail.
FIG. 2 is a side sectional view showing a schematic configuration of the reforming unit. FIG. 3 is a side cross-sectional view showing a schematic configuration in the reforming exterior case of the reforming unit of the reforming unit. FIG. 4 is a bottom view showing the reforming section. FIG. 5 is a side sectional view showing a schematic configuration of a combustion chamber portion of the reforming portion. FIG. 6 is a side cross-sectional view showing the rectifying pipe. FIG. 7 is a plan view showing the retaining ring portion attached to the outer cylindrical body. FIG. 8 is a side view showing the heat exchange device. FIG. 9 is a side cross-sectional view showing the piping outer case. FIG. 10 is a plan cross-sectional view showing a pipe exterior case. FIG. 11 is a plan view with a part cut away showing a piping state in a piping portion of the unit main body. FIG. 12 is a side sectional view showing the CO removal exterior case. FIG. 13 is a side view showing the CO transformer. FIG. 14 is a front view with a part cut away showing the CO transformer. FIG. 15 is a plan view showing a CO transformer. FIG. 16 is a side view showing a CO selective oxidizer. FIG. 17 is a front view of the CO selective oxidizer with a part cut away. FIG. 18 is a plan view showing a CO selective oxidizer. FIG. 19 is a plan view showing a partition plate of a CO selective oxidizer. Note that FIGS. 2 to 4 and FIG. 11 are shown with some piping omitted for convenience of explanation. Moreover, FIG. 11 shows the downward side in the vertical direction from the support pedestal part of the reformed exterior case for convenience of explanation.

As described above, the reforming unit 300 has an integrated configuration including a vaporizer, a reformer, a CO converter, a CO selective oxidizer, and a heat exchange device.
As shown in FIG. 2, the reforming unit 300 includes a unit main body portion 400 and a heat insulating portion 500 that covers the unit main body portion 400. The unit main body 400 includes a reforming unit 600, a piping unit 700, and a CO removing unit 800. And the unit main-body part 400 is the reforming part 600 via the piping part 700 in the upper direction with respect to the CO removal part 800 mounted and fixed to the bottom part of the case body which is not shown in figure which accommodates the fuel cell system 100. Are integrally connected.

The reforming unit 600 includes a reformed exterior case 610 that constitutes a case body. The modified exterior case 610 includes a lower case 611 having an upper surface opened, an upper case 612 that covers the upper surface of the lower case 611 and is integrally attached, and a support base that is integrally attached to substantially cover the lower surface of the lower case 611. Part 613.
The lower case 611 is formed, for example, in a substantially cylindrical shape with a steel plate or the like, and more specifically, is formed by using a sheet-wound tube of a steel plate that is a tube material. And the upper connection flange 611A which protrudes in series in a bowl shape toward the inner side is provided at the upper end which is one end in the axial direction of the lower case 611. The upper connecting flange 611A is formed in a shape in which the outer peripheral edge is bent into a substantially cylindrical shape and joined by welding, for example. That is, it is a so-called flange-up shape. Further, a lower screw hole 611B through which a screw (not shown) is penetrated and the support pedestal portion 613 is integrally attached is provided at the lower end which is the other end in the axial direction of the lower case 611.
The upper case 612 is formed of, for example, a steel plate or the like in a substantially cylindrical shape having a diameter smaller than that of the lower case 611, and more specifically, is formed by using a sheet-wound tube of a steel plate that is a tube material. A top plate flange 612A is provided at the upper end, which is one end in the axial direction of the upper case 612, and projects in a bowl shape toward the inside. A cylindrical burner connecting portion 612B is integrally provided on the inner peripheral edge of the top plate flange 612A by welding or the like. Furthermore, a burner connection flange 612C is provided at the upper end, which is one end in the axial direction of the burner connection portion 612B, and protrudes in series in a bowl shape toward the outside. For example, a bolt insertion hole 612E through which the mounting bolt 612D is inserted is formed in the burner connection flange 612C. And the lower end outer peripheral surface which becomes the other end in the axial direction of the upper case 612 is integrally connected to the inner peripheral edge of the upper connecting flange 611A of the lower case 611 bent in a substantially cylindrical shape by welding or the like. Yes. That is, the joint portion between the upper connecting flange 611A and the upper case 612 of the lower case 611 and the joint portion of the top plate flange 612A of the upper case 612 have a so-called flange-up shape.
As shown in FIGS. 2 and 3, the support pedestal 613 is formed in a substantially bottomed cylindrical shape with, for example, a steel plate so as to substantially close the lower end in the axial direction of the lower case 611. The support pedestal portion 613 has a bottom joint portion 613A that is formed in a cylindrical shape whose outer dimension is substantially the same as the inner diameter dimension of the lower case 611. A partition bottom portion 613B that protrudes inward toward the inside is provided in series at a lower end that is one end in the axial direction of the bottom joint portion 613A. The bottom joint portion 613A is provided with an attachment female screw portion 613C that is screwed in correspondence with the lower screw hole 611B of the lower case 611. The screwed portion between the bottom joint 613A and the lower case 611 is preferably sealed with, for example, a heat-resistant caulking material. The support pedestal 613 is integrally connected to the other end in the axial direction of the lower case 611 so that a part of the axial direction protrudes from the other end of the lower case 611. In addition, a substantially circular heat exchange hole 613D is formed in the partition bottom 613B of the support pedestal 613. Further, as shown in FIG. 4, the support base 613 is provided with a plurality of, for example, three column mounting screw holes 613 </ b> E in the partition bottom 613 </ b> B.

In the reforming exterior case 610, as shown in FIGS. 2 and 3, a reformer 620 and a heat exchanging device 640 as a steam generating means are disposed.
The reformer 620 includes a combustion chamber 621, a burner unit 151, and a reforming vessel 622.

As shown in FIGS. 2 and 5, the combustion chamber portion 621 includes a combustion cylinder portion 621 </ b> A that is formed of a steel plate or the like and has a cylindrical shape slightly smaller in diameter than the burner coupling portion 612 </ b> B of the upper case 612. . The combustion cylinder portion 621A is provided with a positioning dowel 621B that bulges inward at a predetermined position on the upper end side that is one end in the axial direction. Also, a support flange 621C that protrudes outward in a bowl shape is provided at the upper end, which is one end in the axial direction, of the combustion cylinder portion 621A, like the burner connection flange 612C. The support flange 621C is formed with a bolt insertion hole 612E through which the mounting bolt 612D is inserted, similarly to the burner connection flange 612C.
In addition, a flame rectification unit 621F is integrally disposed in the combustion chamber unit 621. The flame rectifying portion 621F has an attachment cylindrical portion 621F1 that has an outer diameter that is substantially the same as the inner diameter of the combustion cylinder portion 621A and is positioned on the upper end side of the combustion cylinder portion 621A and attached integrally by welding or the like. . Further, a funnel-shaped rectifying cylinder portion 621F2 having a diameter gradually decreasing in accordance with the distal end side is provided in series at the lower end, which is one end in the axial direction of the mounting cylindrical portion 621F1. The flame rectifying unit 621F is positioned by a positioning dowel 621B of the combustion cylinder 621A, and the attachment cylinder 621F1 is integrally attached to a predetermined position on the inner peripheral side of the combustion cylinder 621A by welding or the like.

For example, as shown in FIG. 2, the burner unit 151 burns a burner body portion 651 that is cast, the liquid fuel 111 that is fuel, and the off-gas that is fuel gas discharged from the negative electrode 202 of the fuel cell 200. And a burner section 652 having a plurality of combustion ports (not shown) for generating a flame.
The burner body 651 has a first air introduction part 651A in which air supplied from the air supply blower 170 is introduced as primary air, and a second air introduction part (not shown) in which supplied air is introduced as secondary air. And an off-gas introduction part 651B for introducing and burning off-gas. In addition, a liquid fuel supply pipe 651C to which the liquid fuel 111 is supplied is connected to the first air introduction part 651A, and the supplied liquid fuel 111 is mixed with the primary air and supplied to the burner body part 651 to be sufficiently vaporized. And burned. As a connection structure of the liquid fuel supply pipe 651C, it is preferable to connect the liquid fuel supply pipe 651C to a bent portion of the first air introduction part 651A formed to be bent in a substantially L shape. Further, the burner body 651 is provided with a preheating electric heater 651D for evaporating the liquid fuel 111 and an ignition electrode (not shown). Note that the preheating electric heater 651D is used only at the time of start-up, and once combustion is started, heat for evaporating the liquid fuel 111 is obtained from the surroundings, so that the energization to the preheating electric heater 651D is turned off. The
The burner unit 151 is supported such that the mounting flange 651E provided in a bowl shape on the burner main body 651 further overlaps the burner connection flange 612C of the overlapping upper case 612 and the support flange 621C of the combustion chamber 621, A mounting bolt 612D is screwed. In this state, the upper end portion of the upper case 612 of the reformed exterior case 610 is closed, and the burner unit 151 is integrally provided.
The attached state of the burner unit 151 corresponds to the upper end portion of the reforming vessel 622 while the lower end portion of the burner portion 652 is substantially located within the rectifying cylinder portion 621F2 of the flame rectifying portion 621F of the combustion chamber portion 621. Is in position.

As shown in FIGS. 2 and 3, the reforming container 622 has an inner cylindrical body 622A and an outer cylindrical body 622B having different diameters and substantially coincident with the central axis, and these inner cylindrical body 622A and outer cylindrical body 622A. It is formed in a substantially annular cylindrical shape that partitions and forms a reforming chamber 622 </ b> C having a substantially annular space between the cylindrical bodies 622 </ b> B, and is disposed in a state of being located in the upper case 612.
Further, the reforming vessel 622 is formed on a reforming vessel that is formed in a substantially ring shape on the upper end side that is one end side in the axial direction of the inner cylindrical body 622A and the outer cylindrical body 622B and partitions the reforming chamber 622C. A closing plate 622D is provided. Further, the reforming vessel 622 has a substantially disc-shaped modification in which the peripheral edge is fitted to the lower end portion of the outer cylindrical body 622B and closed at the lower end side which is the other end side in the axial direction of the outer cylindrical body 622B. A quality container lower closing plate 622E is provided.
In addition, the reforming container lower closing plate 622E is fitted with the lower end portion of the inner cylindrical body 622A at the periphery, and the reforming container lower closing portion 622E closes the lower end portion of the inner cylindrical body 622A. The partition plates 622F are integrally provided by concentrically laminating.
The reforming chamber 622C partitioned by the reforming vessel 622 is filled with a reforming catalyst to form a reforming catalyst layer 622G. As the reforming catalyst layer 622G, a packed bed may be provided on the lower end side in the axial direction so that alumina particles are filled and the vaporized liquid fuel flows through the reforming catalyst layer 622G substantially uniformly.

Further, the reforming vessel 622 is attached by closing the inner peripheral side of the lower end portion of the inner cylindrical body 622A, and defines a heating chamber 622H containing the combustion chamber portion 621 on the inner peripheral side of the reforming vessel 622. A heating chamber partition plate 622I is provided. In the heating chamber partition plate 622I, a connecting screw portion 622J having a male screw 622J1 provided on the outer peripheral surface of the tip portion is integrally protruded at a substantially center on the upper surface side which is one surface side.
Further, as shown in FIG. 2, a refractory heat insulating material 622K formed in a flat ring shape is provided on the upper surface side of the heating chamber partition plate 622I so as to fit the connecting screw portion. The refractory heat insulating material 622K is arranged in a state in which the male screw 622J1 of the connecting screw portion 622J protrudes, that is, the temperature on the lower surface side of the heating chamber partition plate 622I is set to a temperature that does not exceed a predetermined temperature, for example, about 500 ° C. Even in the state where the refractory heat insulating material 622K is disposed, the connecting screw portion 622J is formed in a state in which the male screw 622J1 of the connecting screw portion 622J protrudes.
Further, a rectifying pipe 622L is connected to the connecting screw portion 622J. As shown in FIGS. 2 and 6, the rectifying pipe 622L is formed in a substantially bottomed cylindrical shape whose one end in the axial direction is substantially closed by a closing plate 622L1. The rectifying pipe 622L has a length dimension in which the axial direction substantially corresponds to the reforming catalyst layer 622G, the outer diameter is smaller than the inner diameter of the combustion cylinder part 621A of the combustion chamber part 621, and the outer peripheral surface of the combustion cylinder part 621A. It is formed so as to face the inner peripheral surface with a predetermined gap. A male screw insertion hole 622L2 into which a male screw 622J1 of the connecting screw portion 622J is fitted and a nut (not shown) is screwed is provided at the approximate center of the closing plate 622L1 of the rectifying tube 622L. Further, the rectifying pipe 622L is integrally provided with a turbulent flow portion 622L3 arranged on the outer peripheral surface in a spiral shape with respect to the central axis by using an elongated steel material. This turbulent flow part 622L3 does not contact the inner peripheral surface of the combustion cylinder part 621A, and the combustion gas of the burner unit 151 that circulates between the outer peripheral surface of the rectifying pipe 622L and the inner peripheral surface of the combustion cylinder part 621A. Is formed so as to circulate spirally with respect to the central axis. 6 shows the turbulent flow portion 622L3 formed of one elongated steel material for convenience of explanation. However, the outer peripheral surface of the rectifying tube 622L may be formed into a plurality of turbulent portions 622L3, for example, so that the cross section has a wave shape. It can be formed in various shapes, such as projecting from or extending in a rib shape, or a combination of these with an elongated steel material.
The closing plate 622L1 of the rectifying pipe 622L is described as an example of a plate shape in which the combustion gas of the burner unit 151 cannot flow. For example, a plate having a hole through which a part of the combustion gas can flow, mesh Various forms such as a shape can be used. That is, the closing plate 622L1 adds a flow resistance to the combustion gas that tends to flow from the burner unit 151 side to the other end side in the rectifying pipe 622L, and at least a part of the combustion gas from the burner unit 151 is rectified pipe. It functions to flow between the outer peripheral side of 622L and the inner peripheral side of the combustion cylinder portion 621A. Therefore, it is preferable that the gas is completely closed. However, the combustion gas may flow depending on the flow resistance between the rectifying pipe 622L and the combustion cylinder 621A, the degree of heating of the rectifying pipe 622L and the combustion cylinder 621A, and the like. You may make it provide the hole etc. which one part can pass through the obstruction | occlusion board 622L1.
The combustion cylinder portion 621A and the rectifying pipe 622L allow the combustion gas of the burner unit 151 to flow between the outer peripheral surface of the rectifying pipe 622L and the inner peripheral surface of the combustion cylinder portion 621A from within the rectifying pipe 622L. Further, the combustion gas flows between the outer peripheral surface of the outer cylindrical body 622B of the reforming vessel 622B and the upper case 612 from between the outer peripheral surface of the combustion cylindrical portion 621A and the inner peripheral surface of the inner cylindrical body 622A of the reforming vessel 622. Between the inner surface of the lower case 611 and the upper surface of the support pedestal 613.

Further, as shown in FIGS. 2 and 3, a ring-shaped holding ring portion 622 </ b> M is fitted and fixed to the reforming container 622 at the upper end side in the axial direction of the outer cylindrical body 622 </ b> B. As shown in FIG. 7, the holding ring portion 622 </ b> M has a plurality of holding piece portions 622 </ b> M <b> 2 projecting in a tongue-like shape toward the inner peripheral side and having fitting insertion holding holes 622 </ b> M <b> 1. Has been.
Further, as shown in FIGS. 2, 3 and 7, the reforming vessel 622 has a substantially equal interval in the circumferential direction, for example, three locations and a predetermined interval in the axial direction on the outer peripheral surface of the outer cylindrical body 622 B. For example, positioning protrusions 622N are provided at two locations. These positioning projections 622N are provided in a shape that positions the tip of the positioning container 622 and the upper case 612 so as to be positioned substantially coaxially with their tips substantially in contact with the inner surface of the upper case 612, respectively. The positioning protrusion 622N is formed, for example, such that a steel plate is bent to form a substantially triangular shape in plan view in the vertical direction, that is, the combustion gas of the burner unit 151 in the vertical direction can flow. Furthermore, the reforming vessel 622 is provided with three sensor protection pipes 622O provided with temperature sensors (not shown) for detecting the temperature of the reforming catalyst layer 622G in the axial direction.

The reforming vessel 622 is provided with a circulation part 622P. The circulation unit 622P is configured to flow the raw material gas into the reforming vessel 622 and to flow out, that is, recover the generated reformed gas. As shown in FIGS. 2 and 3, the circulation part 622P has a supply pipe 622Q1 and a return pipe 622Q2 that is fitted into the supply pipe 622Q1 substantially coaxially, and is in the axial direction of the reforming vessel 622. A plurality of double pipe portions 622Q having a double pipe structure that is connected to the lower end of the lower case 611 and located in the lower case 611.
The supply pipe 622Q1 has an upper end that is one end in the axial direction, in the vicinity of the outer peripheral edge of the reforming vessel lower closing plate 622E of the reforming vessel 622, that is, at a position corresponding to the reforming catalyst layer 622G at an approximately equal interval in the circumferential direction. A plurality of circumferential sides are arranged in a state communicating with the reforming catalyst layer 622G.
The return pipe 622Q2 opens at the upper end side, which is one end in the axial direction, through the reforming catalyst layer 622G so that the reformed gas can flow into the upper end side, which is one end side in the axial direction in the reforming chamber 622C. The retaining ring portion 622M of the quality container 622 is inserted into and fixed to the fitting insertion holding hole 622M1, and the other end in the axial direction is disposed so as to protrude from the supply pipe 622Q1 by a predetermined amount.
Thus, the double pipe portion 622Q has one end in the axial direction in the vicinity of the outer peripheral edge of the reforming vessel lower blocking plate 622E of the reforming vessel 622, that is, at a substantially equal interval in the circumferential direction at a position corresponding to the reforming catalyst layer 622G. Multiple connections to 7 shows a configuration in which 16 return pipes 622Q2 of the double pipe portion 622Q are connected and held for convenience of explanation, the present invention is not limited to 16. Further, it is preferable that the double pipe portion 622Q is provided with 3 or more and 32 or less.
When the number of the double pipe portions 622Q is two or less, the heat exchange rate is greatly reduced, and the inflowing raw material gas is drifted, so that a good contact efficiency with the reforming catalyst cannot be obtained. There is a risk that it cannot be generated. On the other hand, when the number of the double pipe portions 622Q is 33 or more, the structure becomes complicated as the small reforming unit 300 used particularly for home use, and the productivity may be lowered. Accordingly, the number of the double pipe portions 622Q is preferably 3 or more and 32 or less.

Further, as shown in FIGS. 2 and 3, a substantially disc-shaped flow disc portion 622R1 is provided at the lower end of the double pipe portion 622Q which is the other end in the axial direction of the supply pipe 622Q1. That is, a plurality of supply pipes 622Q1 are connected to the vicinity of the outer peripheral edge of the circulation disk portion 622R1 so as to be substantially equally spaced in the circumferential direction.
Furthermore, a substantially disc-shaped flow partitioning part 622R2 is provided at the lower end, which is the other end in the axial direction, of the return pipe 622Q2 of the double pipe part 622Q. The circulation partition 622R2 is formed in a substantially cylindrical shape having a peripheral edge that fits the outer periphery of the flow disk part 622R1 in a substantially airtight manner, and a substantially center is formed in a substantially cylindrical shape on the opposite side of the peripheral edge. In addition, a partition closing plate 622R3 that closes the substantially center is integrally provided in the distribution partition portion 622R2.
Then, by these flow disk part 622R1, flow partition part 622R2 and partition closing plate 622R3, a substantially columnar shape communicating with the reforming catalyst layer 622G via the outer peripheral surface of the return pipe 622Q2 and the inner peripheral surface of the supply pipe 622Q1. A source gas supply unit 622R that partitions the space is provided.

In addition, a raw material gas supply pipe 622S that is connected to the internal space of the raw material gas supply unit 622R and supplies the vaporized liquid fuel gas to the raw material gas supply unit 622R is connected to the partition closing plate 622R3. ing.
The source gas supply pipe 622S has a vaporizer 630 as shown in FIGS. The vaporizer 630 includes a liquid fuel connection portion 631 to which a desulfurized fuel supply pipe 740 (see FIG. 11) to which the liquid fuel 111 desulfurized by the desulfurizer 130 is supplied, a CO converter 820 to be described in detail, and Generated by the first water vapor connection portion 632A to which a first water vapor supply pipe (not shown) to which water vapor generated by cooling of the CO selective oxidizer 830 (see FIGS. 2 and 11) is supplied and the heat exchange device 640 are supplied. A steam connection section 632 having a second steam connection section 632B to which a not-shown second steam supply pipe (not shown) is supplied is formed in a substantially T-tube shape. That is, the vaporizer 630 causes the supplied liquid fuel 111 and water vapor to merge and mix to generate vaporized liquid fuel.
Also,
Furthermore, the raw material return pipe 622S is connected between the vaporizer 630 and one end serving as a connection position with the raw material gas supply section 622R, and the raw material return pipe 730 (see FIG. 11) is connected. 622S2 is provided. This raw material return section 622S2 is returned by the operation of a safety valve (not shown) provided outside the reforming unit 300 in the raw material return pipe 730, or returned vaporized liquid fuel or reformed gas, or generated vaporized liquid. The fuel flows out of the reforming unit 300 through the raw material return pipe 730. That is, the safety valve normally supplies vaporized liquid fuel to the source gas supply unit 622R through the source gas supply pipe 622S, and the internal pressure in the source gas supply unit 622R is reduced due to, for example, the reforming catalyst layer 622G being blocked. When reaching a predetermined value or more, an operation of causing vapor phase liquid fuel gas, reformed gas or the like in the source gas supply unit 622R to flow out of the reforming unit 300 from the source gas supply pipe 622S through the source return pipe 730 do.
In addition, what flows out as the raw material return pipe 730 is not only a gas phase component, but also liquid such as condensed water of a liquid phase that is pure water 181 that has not been sufficiently heated at the beginning of startup or the like to become water vapor. The structure can also flow out. In addition, the component condensed from the gas phase component by the outflow of the gas phase component to the outside of the reforming unit 300 such as the vaporized liquid fuel to be discharged may be recovered in a receiving portion provided separately. The receiving part is provided with a window in which the liquid fuel 111, which is a desulfurized fuel that has been collected and condensed, water, etc. can be visually observed, or the fact that it has been recovered by a sensor or the like, and the safety valve functions. It is good to be able to detect what happened. Note that the receiving portion may be configured to store not only the liquid phase component that is a condensed component of the gas phase component but also the gas phase component itself.
Here, the relationship between the inner diameter A of the liquid fuel connection portion 631 of the vaporizer 630 of the raw material gas supply pipe 622S and the inner diameter B of the flow path from the raw material gas supply pipe 622S to the raw material return pipe 730 returned by the safety valve is B It is preferable to set / A = 1-15. Here, if the relationship of B / A <1 is satisfied, the pressure in the source gas supply unit 622R may not be reduced satisfactorily. On the other hand, even if the relationship of B / A> 15 is satisfied, it is not possible to reduce the outflow resistance of the vaporized liquid fuel or the like, and there is a possibility that the apparatus becomes large. For this reason, it is preferable to set B / A = 1-15. The relationship between the cross-sectional area C of the liquid fuel connection portion 631 and the cross-sectional area D of the flow path from the raw material gas supply pipe 622S to the raw material return pipe 730 is preferably set to D / C = 1 to 220. Similarly, the relationship between the cross-sectional areas is preferably set to D / C = 1 to 220 from the viewpoint of outflow resistance of vaporized liquid fuel and the like, and from the viewpoint of increasing the size of the apparatus. In the household fuel cell system 100 in this embodiment, B / A = 2.0 and D / C = 4.0 are set.

Further, as shown in FIGS. 2 and 3, the circulation partition 622R2 constituting the source gas supply unit 622R is formed in a substantially cylindrical shape that fits the outer periphery of the circulation partition 622R2, and is distributed substantially in the center. A partition cylindrical portion 622T1 formed in a substantially cylindrical shape that fits an inner peripheral edge formed in a substantially cylindrical shape of the partition portion 622R2 is provided. The partition cylindrical portion 622T1 is laminated on the partition bottom portion 613B of the support base portion 613 of the reformed exterior case 610 and attached to the support base portion 613 by welding or the like so as to close the inner peripheral edge of the partition bottom portion 613B. It is done.
The partition tubular portion 622T1 and the flow partition 622R2 define a substantially annular space communicating with the return pipe 622Q2, and reformed by the reforming catalyst layer 622G and generated through the return pipe 622Q2. A reformed gas outflow portion 622T into which gas is introduced is provided.
Further, the partition tubular portion 622T1 is positioned closer to the center side than the inner peripheral edge of the partition bottom portion 613B of the support pedestal 613, and the reformed gas discharge that communicates the reformed gas outflow portion 622T to the outside of the partition tubular portion 622T1. A tube portion 622T2 is provided.

The heat exchange device 640 has a double tube structure. As shown in FIGS. 2, 3, and 8, the heat exchange device 640 includes a reformed water inner pipe 641 through which pure water 181 is circulated, and an outside of the exhaust air passage into which the reformed water inner pipe 641 is inserted. A tube 642.
The exhaust air duct outer pipe 642 has one end in the axial direction opened, the other end in the axial direction is fitted and fixed to the heat exchange hole 613D of the support base 613 by welding or the like, and has a predetermined diameter smaller than the inner diameter of the lower case 611. It is formed in a spiral shape with a curvature radius of. That is, the exhaust air duct outer pipe 642 is disposed in a state where the upper surface side and the lower surface side of the support pedestal portion 613 communicate with each other, and the combustion gas burned in the burner unit 151 that circulates through the heating chamber 622H of the reformer 620. However, it is the state which distribute | circulates from the upper surface side of the support base part 613 to the lower surface side of the support base part 613 via the inside of the exhaust air path outer pipe | tube 642. As shown in FIGS. 2 and 3, the exhaust air duct outer tube 642 is provided with a spacer 642 </ b> A formed in a substantially drum shape, for example, with a steel plate, and maintains a spiral shape at a predetermined interval.
The reformed water inner pipe 641 has one end side in the axial direction extending from one end where the exhaust air path outer pipe 642 opens, and the other end side in the axial direction is connected to the support base 613 in addition to the exhaust air path outer pipe 642. It extends from the end and is fitted into the exhaust air passage outer pipe 642 and disposed. Although details will be described later, in terms of heat exchange efficiency between pure water 181 and the combustion gas, the reformed water inner pipe 641 is substantially coaxially fitted into the exhaust air duct outer pipe 642 and disposed. However, a configuration in which a separate member such as a pipe or a spacer for positioning on the same axis is provided may be used. Although the details of the reformed water pipe 641 will be described later, one end side in the axial direction, which is an end corresponding to the outflow side of water vapor generated by heat exchange, passes through the support pedestal 613, and the support pedestal 613. It is arrange | positioned in the state extended to the lower surface side. Note that the penetration portion of the support pedestal 613 of the reformed water inner pipe 641, that is, the penetration portion of the support pedestal 613 of a steam connection pipe (not shown) connected to the reformed water inner pipe 641, is welded or brazed substantially airtightly. It is sealed by etc. Also, the reformed water supply pipe 720 to which pure water 181 as reformed water is supplied to the other end side in the axial direction extending to the lower surface side of the support pedestal 613 in the reformed water inner pipe 641 (FIG. 11). Reference) is connected, and pure water 181 is circulated in the reformed water inner pipe 641. Further, the tip of the reformed water inner pipe 641 extending to the lower surface side of the support pedestal 613 is connected to the second water vapor connection part 632B in the vaporizer 630 of the source gas supply pipe 622S provided in the reformer 620. A second water vapor supply pipe (not shown) to be connected is connected. That is, the reformed water inner pipe 641 generates steam by exchanging heat of the pure water 181 by the flow of the combustion gas by the burner unit 151 flowing through the exhaust air duct outer pipe 642, and the generated steam is vaporized. It supplies to 630 via a 2nd water vapor | steam supply pipe | tube.

As shown in FIGS. 2 to 4, the piping unit 700 of the reforming unit 300 includes a piping exterior case 710 that constitutes a case body. The pipe outer case 710 includes a pipe covering part 711 and a connecting cylinder part 712.
As shown in FIGS. 2 to 4, 9, and 10, the pipe covering portion 711 is formed in a cylindrical shape having substantially the same diameter as the lower case 611 of the reformed exterior case 610, more specifically, a steel plate that is a pipe material It is formed using the plate winding tube. The upper end side, which is one end in the axial direction, of the pipe covering portion 711 is integrally connected by fitting the bottom joint portion 613A of the support pedestal portion 613 of the reforming portion 600 by welding or brazing. The pipe cover 711 includes a reformed water supply pipe 720, a raw material return pipe 730, a desulfurized fuel supply pipe 740, an air supply pipe 750, a fuel gas outflow pipe 760, and a cooling water pipe 770, as shown in FIG. Pipe holes 711A, 711B, 711C, 711D, 711E, and 711F to be inserted are drilled. In addition, the pipe covering portion 711 is provided with a plurality of, for example, four, for example, four positioning dowels 711G that bulge into the inner package.
The connecting cylinder portion 712 is formed in a substantially cylindrical shape having a diameter dimension that can be fitted to the lower end side, which is the other end in the axial direction of the pipe covering portion 711, and more specifically, a pipe material. It is formed using a sheet-wound tube of a certain steel plate. Further, the other end side in the axial direction of the connecting tube portion 712 is formed in a state of being slightly reduced in diameter. The connecting cylinder portion 712 has a plurality of engaging recesses 712 </ b> A formed in a concave shape that are positioned by engaging the positioning dowels 711 </ b> G of the pipe covering portion 711 with the upper end edge in the axial direction corresponding to the positioning dowels 711 </ b> G. For example, four places are provided. Then, the connecting cylinder portion 712 is fitted to the pipe covering portion 711 at the upper end side in the axial direction, and the engaging recess 712A is engaged with the positioning dowel 711G and positioned, and other than the axial direction from the pipe covering portion 711 by welding or the like. It is connected so that the end side is exposed. Further, the connecting cylinder portion 712 has a plurality of connecting female screw holes 712B into which, for example, screw members (not shown) as connecting attachment members are screwed, at the lower end portion on the other end side in the axial direction exposed from the pipe covering portion 711. Is provided.

As shown in FIG. 2, the CO removal unit 800 includes a CO removal exterior case 810 that constitutes a case body, and a CO transformer 820 and a CO selective oxidizer 830 that are disposed in the CO removal exterior case. ing.
As shown in FIGS. 2 and 12, the CO removal outer case 810 includes a substantially cylindrical lower body portion 811 having substantially the same diameter as the lower case 611 of the reforming outer case 610 and the pipe covering portion 711 of the pipe outer case 710. Have. The lower body portion 811 is formed, for example, in a substantially cylindrical shape using a steel plate or the like, and more specifically, is formed using a sheet-wound tube of a steel plate that is a tube material. The CO removal exterior case 810, the above-described modified exterior case 610, and the piping exterior case 710 constitute an exterior case of the unit main body 400.
A connecting screw hole 811 </ b> A that is screwed corresponding to the connecting female screw hole 712 </ b> B of the connecting tube portion 712 of the pipe exterior case 710 is provided on the upper end side that is one end side in the axial direction of the lower body portion 811. The screwed portions of the lower body portion 811 and the connecting cylinder portion 712 are preferably sealed with, for example, a heat-resistant caulking material. Further, a plurality of screw through holes 811B are provided on the lower end side which is the other end side in the axial direction of the lower body portion 811. In addition, an exhaust gas port 811 </ b> C that communicates the inside with the outside is formed at the lower end side in the axial direction of the lower body portion 811.
Further, on the lower end side of the lower body portion 811, a heat insulating material support portion 812 that protrudes outward from the outer peripheral surface in a bowl shape and that supports the heat insulating portion 500 is provided. The heat insulating material support portion 812 has an attachment cylindrical portion 812A having an inner diameter that is substantially the same as the outer diameter of the lower body portion 811, and an outward flange at an upper end that is one end in the axial direction of the attachment cylindrical portion 812A. And a cylindrical holding portion 812C formed on the outer peripheral edge of the flange portion 812B in a cylindrical shape on the opposite side to the attachment cylindrical portion 812A and substantially coaxial with the attachment cylindrical portion 812A. Have. As shown in FIG. 2, the heat insulating material support portion 812 is inserted with a screw (not shown) in a screw insertion hole 812 </ b> A <b> 1 provided in the attachment cylindrical portion 812 </ b> A corresponding to the screw through hole 811 </ b> B of the lower body portion 811. And integrally attached to the lower body portion 811. In this attached state, the flange portion 812 </ b> B of the heat insulating material support portion 812 is substantially in alignment with the opening edge of the exhaust port 811 </ b> C of the lower body portion 811. In addition, as shown in FIG. 12, one end in the axial direction is attached to the exhaust port 811C of the lower body part 811 in the cylindrical holding part 812C of the heat insulating material support part 812, for example, by welding or brazing. The exhaust gas pipe 840 that exhausts the exhaust gas from the exhaust gas port 811C to the outside of the reforming unit 300 is provided with a notch 812C1 that is formed to be engageable.
Further, as shown in FIG. 2, a bottom plate portion 813 formed in a substantially disc shape with a steel plate or the like is provided on the lower end side which is the other end side in the axial direction of the lower body portion 811. The bottom plate portion 813 includes a substantially disc-shaped bottom plate 813A and a bottom plate connecting portion 813B formed in a series of cylinders whose outer diameter is substantially the same as the inner diameter of the lower body portion 811 from the periphery of the bottom plate 813A. is doing. The bottom plate connecting portion 813B of the bottom plate portion 813 is provided with a mounting female screw hole 813B1 corresponding to the screw through hole 811B of the lower body portion 811 and screwed into the screw through hole 811B. Is attached in a state of closing the lower end side of the lower body portion 811. Further, the bottom plate 813A of the bottom plate portion 813 is provided with two pairs of heater through holes 813A1 through which a CO conversion electric heater 823 and a CO selective oxidation electric heater 833, which will be described in detail later, and a temperature sensor are arranged. Two sensor through-holes (not shown) through which the CO conversion sensor protection tube 825 and the selective oxidation sensor protection tube 835 pass are provided.
Further, as shown in FIG. 2, a positioning and holding base portion 814 for positioning and holding the CO transformer 820 and the CO selective oxidizer 830 is provided on the upper surface of the bottom plate 813 </ b> A of the bottom plate portion 813. The positioning holding base portion 814 is provided with two pairs of notch recesses 814A to which the CO transformer 820 and the CO selective oxidizer 830 are respectively engaged at the upper end edge.
Further, the bottom plate 813A of the bottom plate portion 813 is provided with a column screw hole (not shown) corresponding to the column mounting screw hole of the support base portion 613 of the modified exterior case 610. Between the bottom plate portion 813 and the support pedestal portion 613 of the modified exterior case 610, as shown in FIGS. 2 and 11, both end portions in the longitudinal direction are the column screw holes and the column mounting of the support pedestal portion 613, respectively. A plurality of, for example, three support columns 815, which are screwed into the screw holes 613E and connect the bottom plate portion 813 and the support base portion 613, are attached.

As shown in FIGS. 2 and 13 to 15, the CO converter 820 has a CO conversion container 821 formed in a hollow, substantially rectangular shape.
As shown in FIGS. 13 to 15, the CO conversion container 821 has a substantially box-shaped CO conversion container main body part 821A that is open on one surface, and one surface of the CO conversion container main body part 821A is closed, for example, by welding or brazing. And a CO conversion container lid 821B attached by, for example. The CO conversion container main body 821A is connected to the reformed gas discharge pipe 622T2 of the flow section 622P of the reforming container 622, and the reformed gas supplied from the reformed gas discharge pipe 622T2 enters the CO conversion container 821. A reformed gas inflow pipe 821A1 to be supplied is provided substantially at the center of one side surface. In the CO conversion container lid portion 821B, the reformed gas that has flowed into the inside is provided at the approximate center near the lower edge on the opposite side to the side where the reformed gas inflow pipe 821A1 of the CO conversion container main body portion 821A is provided. A reformed gas outlet 821B1 to be discharged is formed as an opening. Further, a reinforcing sheet metal 821B2 is provided at substantially the center of the CO conversion container lid 821B. Note that the configuration is not limited to the configuration in which the reinforcing sheet metal 821B2 is provided, and various types of reinforcement configurations can be applied, for example, a portion other than the peripheral edge to be joined to the CO conversion container main body 821A is formed in an uneven shape such as a wave shape.
The CO shift vessel 821 is provided with a CO shift catalyst layer 822 filled with a CO shift catalyst.
In the CO conversion container 821, a CO conversion electric heater 823 such as a sheathed heater for heating the CO conversion catalyst layer 822 is disposed. This CO conversion electric heater 823 is located on the other side opposite to the one side where the reformed gas inflow pipe 821A1 of the CO conversion container main body 821A is provided, and is a heater for the bottom plate portion 813 of the CO removal exterior case 810. A pair of heater fitting insertion holes 821A2 provided corresponding to the through holes 813A1 are arranged in a substantially U shape so as to penetrate airtightly. Further, the CO transformation electric heater 823 is formed by cutting and raising a bent top portion in a cooling pipe attachment plate 821C which is attached in a CO transformation vessel 821 and bent into a substantially U-shaped cross section with a steel plate, for example. It is held by the heater mounting piece 821C1. This electric heater 823 for CO conversion is welded or brazed to the CO conversion container main body portion 821A in an airtight manner to prevent inconvenience due to electric leakage or the like, and is welded to the bottom plate portion 813 of the CO removal exterior case 810. It is preferable to apply brazing or brazing.
Further, in the CO conversion container 821, a CO conversion cooling pipe 824 that also functions as a water vapor generating means formed in a spiral shape is held and disposed by a cooling pipe mounting plate 821C. One end of the CO shift cooling pipe 824 in the axial direction is connected to the first steam connection of the raw material gas supply pipe 622S of the reforming vessel 622 from one side surface where the reformed gas inflow tube 821A1 of the CO shift vessel main body 821A is provided. It extends in an airtight manner so as to be connectable to a first water vapor supply pipe (not shown) connected to the portion 632A. The other end of the CO shift cooling pipe 824 in the axial direction is near the lower edge on the opposite side to the side where the reformed gas inflow pipe 821A1 of the CO shift vessel main body portion 821A is provided in the CO shift vessel lid portion 821B. It extends through airtightly.
The CO conversion container 821 has a sensor (not shown) of the bottom plate portion 813 of the CO removal exterior case 810 on the other side opposite to the one side where the reformed gas inflow pipe 821A1 of the CO conversion container main body 821A is provided. A CO conversion sensor protective tube 825 is provided that is airtightly inserted into a sensor insertion hole (not shown) provided corresponding to the through-hole for use, and is provided with a temperature sensor (not shown).
Further, the CO shift vessel 821 is connected to the reformed gas outlet 821B1 of the CO shift vessel lid portion 821B, and an air introduction portion 826 for flowing out the reformed gas in the CO shift vessel 821. The air inlet 826 is connected to an air supply pipe 750 and is formed in a substantially T-tube shape that mixes air from the air supply pipe 750 with the reformed gas flowing out from the reformed gas outlet 821B1.

As shown in FIGS. 2 and 16 to 18, the CO selective oxidizer 830 has a CO selective oxidation vessel 831 formed in a hollow, substantially rectangular shape.
As shown in FIGS. 16 to 18, the CO selective oxidation container 831 has a substantially box-shaped CO selective oxidation container main body portion 831 </ b> A whose one surface is open, and one surface of the CO selective oxidation container main body portion 831 </ b> A is closed. And a CO selective oxidation container lid portion 831B attached by, for example. The CO selective oxidation vessel lid portion 831B communicates with the reformed gas outlet 821B1 of the CO converter 820 via the air inlet 826, and the reformed gas mixed with the air supplied from the reformed gas outlet 821B1. A reformed gas introduction pipe 831B1 that supplies CO into the CO selective oxidation vessel 831 is provided at the approximate center in the vicinity of the lower edge serving as one edge. In the CO selective oxidation container main body 831A, a fuel gas, which is a reformed gas that has flowed into the interior and has CO removed therein, is selected at the center of the upper end surface opposite to the reformed gas introduction pipe 831B1. A fuel gas outlet pipe 831A1 that flows out of the oxidation container 831 is provided. The fuel gas outlet pipe 831A1 is connected to the fuel gas outlet pipe 760, and the fuel gas flows out of the reforming unit 300 through the fuel gas outlet pipe 760.
The CO selective oxidation container 831 is filled with a diffusion region 831C1 communicating with the reformed gas introduction pipe 831B1 and a CO selective oxidation catalyst communicating with the fuel gas outlet pipe 831A1 to form a CO selective oxidation catalyst layer 832. A partition plate 831D for partitioning the reaction region 831C2 is provided. As shown in FIG. 19, the partition plate 831D is formed with a plurality of communication holes 831D1 that allow the diffusion region 831C1 and the reaction region 831C2 to communicate with each other. These communication holes 831D1 have a plurality of, for example, 0.3 mm or more and 6 mm or less so that the reformed gas mixed with the air flowing in from the reformed gas introduction pipe 831B1 and flowing into the diffusion region 831C1 can be distributed almost uniformly to the reaction region 831C2. An opening is formed. The partition plate 831D is not limited to the configuration having the plurality of communication holes 831D1, and a mesh member may be used. Furthermore, alumina particles or the like may be filled in a portion corresponding to the diffusion region 831C1 without using the partition plate 831D.
Further, in the CO selective oxidation container 831, as shown in FIGS. 16 to 18, an electric heater 833 for CO selective oxidation such as a sheathed heater for heating the CO selective oxidation catalyst layer 832 is disposed. This electric heater 833 for CO selective oxidation has a heater through hole in the bottom plate portion 813 of the CO removal exterior case 810 at the lower end surface opposite to the upper end surface where the fuel gas outlet pipe 831A1 of the CO selective oxidation container main body portion 831A is provided. Airtightly penetrates the heater insertion hole 831A2 provided corresponding to 813A1, and is arranged in a substantially U shape so as to penetrate the heater insertion hole 831D2 formed in the partition plate 831D as shown in FIG. Has been. In the same manner as the CO conversion electric heater 823, the CO selective oxidation electric heater 833 is hermetically welded or brazed to the CO selective oxidation container main body 831A in order to prevent inconvenience due to electric leakage or the like. The bottom plate 813 of the CO removal exterior case 810 is preferably welded or brazed.
Further, a CO selective oxidation cooling pipe 834 that also functions as a water vapor generating means formed in a spiral shape in the CO selective oxidation container 831 is provided with a cooling pipe holding plate 831E provided in the CO selective oxidation container 831 in a rib shape. It is held and arranged by. One end of this CO selective oxidation cooling pipe 834 extends in an airtight manner so that one end in the axial direction can be connected to the cooling water pipe 770 from the upper end surface provided with the fuel gas outlet pipe 831A1 of the CO selective oxidation container main body 831A. . The other end of the CO selective oxidation cooling pipe 834 in the axial direction can be connected to the CO conversion cooling pipe 824 of the CO converter 820 so that the reformed gas introduction pipe 831B1 in the CO selective oxidation container lid 831B is provided. It extends in a hermetic manner near the lower edge. Then, pure water 181 which is cooling water supplied from the cooling water pipe 770 flows through the CO selective oxidation cooling pipe 834 and flows into the CO shift cooling pipe 824 while appropriately cooling the CO selective oxidation catalyst layer 832, and further CO 2 While the modified catalyst layer 822 is appropriately cooled, it is converted into water vapor by heat exchange and supplied to the vaporizer 630 of the source gas supply pipe 622S.
Further, the CO selective oxidation container 831 has a sensor fitting (not shown) provided on the lower end surface of the CO selective oxidation container main body 831A corresponding to a sensor through hole (not shown) of the bottom plate portion 813 of the CO removal exterior case 810. A selective oxidation sensor protective tube 835 that is air-tightly inserted into the insertion hole and is fitted into a sensor insertion hole 831D3 formed in the partition plate 831D as shown in FIG. Is provided.
Note that pure water 181 as cooling water supplied to the CO selective oxidation cooling pipe 834 and the CO shift cooling pipe 824 is supplied from the water supply path 183 having the transport pump 182 serving as a path for supplying the heat exchange device 640 to the water supply path 183. Although the structure supplied from the cooling water pipe 770 which comprises a part of this is illustrated (refer FIG. 1), it is good also as supplying from the path | route different from the heat exchange apparatus 640, or a part branched supply. Furthermore, it is not configured to be used for water vapor mixed with the liquid fuel 111. For example, a coolant such as tap water may be circulated as a configuration for recovering the heat of CO conversion and CO selective oxidation like the cooling device 187. Good.

As shown in FIG. 2, the heat insulating part 500 includes a lower heat insulating part 510, an intermediate heat insulating part 520, an upper heat insulating part 530, and a shell 540 as a cover plate.
As shown in FIG. 2, the heat insulating part 500 includes a lower heat insulating part 510, an intermediate heat insulating part 520, an upper heat insulating part 530, and a shell 540.
The lower heat insulating portion 510 is configured in a substantially cylindrical shape by joining a pair of lower block bodies 511 formed by, for example, forming a heat insulating material 511B as a heat insulating member in a semicircular shape in a plan view. The lower heat insulating portion 510 is formed so that the inner diameter is substantially the same as the outer diameter of the CO removing outer case 810 of the CO removing portion 800, and the CO removing portion 800 is included on the inner peripheral side so as to be insulated. . The lower heat insulating portion 510 is formed to have a thickness dimension substantially the same as the inner diameter of the cylindrical holding portion 812C of the heat insulating material support portion 812 of the CO removal exterior case 810, and can be placed on the heat insulating material support portion 812. Has been. Furthermore, on the upper end surface which is one end side in the axial direction of the lower heat insulating portion 510, the reformed water supply pipe 720, the raw material return pipe 730, the desulfurized fuel supply pipe 740, the air supply pipe 750, and the cooling pipe. A concave pipe lower recess 512 is provided at a position corresponding to the water pipe 770 and the fuel gas outflow pipe 760. Further, a concave portion for exhaust gas pipe (not shown) is provided at a position corresponding to the exhaust gas pipe 840 on the lower end surface which is the other end side in the axial direction of the lower heat insulating portion 510. In addition, the lower heat insulating portion 510 is configured by the lower block body 511 that forms a pair, and for example, a heat insulating wool material or a heat insulating material such as a granular material is filled between the shell 540 and the CO removal outer case 810 or the like. It can be formed using various heat insulating materials.
The intermediate heat insulating part 520 is joined to the intermediate block body 521 formed in a substantially semicircular arc shape with the heat insulating material 511B, for example, similarly to the lower heat insulating part 510, and is formed into a substantially cylindrical shape having the same diameter as the lower heat insulating part 510. Is formed. The axial length of the intermediate heat insulating portion 520 is such that the upper end surface of the intermediate heat insulating portion 520 is stacked on the lower heat insulating portion 510 placed on the heat insulating material support portion 812, and the upper end surface is the lower case of the reformed outer case 610. The upper edge of 611 does not protrude from the upper end surface of the intermediate heat insulating portion 520. That is, the intermediate heat insulating portion 520 has an axial length dimension in which the upper end surface is positioned above the thermal expansion dimension of the modified exterior case 610 having a predetermined dimension from the upper end edge of the lower case 611. Is formed. In addition, a concave pipe upper concave portion 522 is provided on the end surface of the intermediate heat insulating portion 520 on the lower heat insulating portion 510 side in the axial direction, corresponding to the pipe lower concave portion 512 of the lower heat insulating portion 510. In addition, it is comprised by the piping lower recessed part 512 of the lower heat insulation part 510 and the piping upper recessed part 522 of the intermediate | middle heat insulation part 520, the reforming water supply pipe 720, the raw material return pipe 730, the desulfurization fuel supply pipe 740, the air supply pipe 750, An opening in which the cooling water pipe 770 and the fuel gas outflow pipe 760 are piped is filled with a heat insulating material (not shown) and closed. Note that the intermediate heat insulating portion 520 can also be formed using various heat insulating materials, similarly to the lower heat insulating portion 510.
The upper heat insulating portion 530 is formed in a substantially cylindrical shape with, for example, a heat insulating material 511B. In addition, like the lower heat insulation part 510, you may comprise in a substantially cylindrical shape with the block body formed in the substantially semicircular arc shape. The upper heat insulating portion 530 can also be formed using various heat insulating materials. The upper heat insulating portion 530 has an outer diameter substantially the same as that of the lower heat insulating portion 510 and the intermediate heat insulating portion 520 and an inner diameter substantially equal to the outer diameter of the upper case 612 of the reformed exterior case 610. Further, the upper heat insulating portion 530 is formed such that the upper end thereof is substantially positioned at the upper end portion of the upper case 612 with the axial length dimension being stacked on the arranged intermediate heat insulating portion 520.
The shell 540 is formed in a substantially cylindrical shape using, for example, a steel plate so as to wrap around the outer peripheral surfaces of the lower heat insulating portion 510, the intermediate heat insulating portion 520, and the upper heat insulating portion 530 stacked in the axial direction. The shell 540 is formed in a cylindrical shape by winding a steel plate so as to surround the outer peripheral surfaces of the stacked lower heat insulating portion 510, intermediate heat insulating portion 520, and upper heat insulating portion 530, and screwing, bonding, tape fixing or the like. . For example, the lower end portion of the shell 540 is interposed between the outer peripheral surface of the lower heat insulating portion 510 and the cylindrical holding portion 812C of the heat insulating material support portion 812, and is fixed by screwing or the like from the cylindrical holding portion 812C.

[Operation of fuel cell system]
(Reforming unit assembly operation)
Next, the assembly operation of the reforming unit 300 in the fuel cell system 100 described above will be described.

First, the flow passage 622P is integrally provided in the reforming vessel 622 and filled with the reforming catalyst. Further, the heat exchanging device 640 is integrally attached to the support pedestal 613. And the partition cylindrical part 622T1 of the distribution | circulation part 622P connected with the modification | reformation container 622 is connected with the support base part 613 with which the heat exchange apparatus 640 was attached by welding etc., for example. Furthermore, one end of the reformed water inner pipe 641 of the heat exchange device 640 that is the outflow side of water vapor that passes through the support pedestal 613 is connected to the second water vapor connection part 632B of the source gas supply pipe 622S and piped.
Thereafter, the outer pipe case 710 is welded or brazed to the support pedestal 613, and the pipe holes 711A, 711B, 711C, 711D, 711E, and 711F of the pipe cover 711 of the pipe outer case 710 are modified. A water supply pipe 720, a raw material return pipe 730, a desulfurized fuel supply pipe 740, an air supply pipe 750, a cooling water pipe 770, and a fuel gas outflow pipe 760 are fitted and welded. Then, the reforming water supply pipe 720 is connected to the reforming water inner pipe 641 of the heat exchanger 640, the raw material return pipe 730 is connected to the raw material return section 622S2 of the raw material gas supply pipe 622S, and the desulfurized fuel supply pipe 740 is used as the raw material. It connects with the liquid fuel connection part 631 of the gas supply pipe 622S, and it pipes.

In addition, the CO transformer 820 and the CO selective oxidizer 830 are positioned and held on the positioning holding base portion 814 of the bottom plate portion 813 and are integrally attached. When the bottom plate portion 813 is attached to the CO transformer 820 and the CO selective oxidizer 830, the CO transformation electric heater 823 and the CO selective oxidation heater 833 are welded to the heater through hole 813A1 of the bottom plate portion 813. Further, the air introduction part 826 integrally attached to the CO converter 820 is connected to the reformed gas introduction pipe 831B1 of the CO selective oxidizer 830, and is extended from the CO conversion container lid part 821B of the CO converter 820. The CO conversion cooling pipe 824 and the CO selective oxidation cooling pipe 834 extending from the CO selective oxidation container lid 831B of the CO selective oxidizer 830 are connected, and the CO converter 820 and the CO selective oxidizer 830 are assembled together.
And while attaching the end of the support | pillar part 815 to the baseplate part 813, attaching the other end of the support | pillar part 815 to the support base part 613 to which the piping exterior case 710 mentioned above was attached, and connected.
In this state, the CO shift cooling pipe 824 of the CO shift converter 820 is connected to the first steam connection 632A of the raw material gas supply pipe 622S of the reforming vessel 622, and the CO selective oxidation cooling pipe 834 of the CO selective oxidizer 830 is connected. Connected to the reformed water supply pipe 720 and piped. In addition, the reformed gas inflow pipe 821A1 of the CO converter 820 is connected to the reformed gas discharge pipe 622T2 of the flow section 622P of the reforming vessel 622 and piped. Further, the fuel gas outlet pipe 831A1 of the CO selective oxidizer 830 is connected to the fuel gas outflow pipe 760 for piping.

Thereafter, the heat insulating material support portion 812 is inserted into the lower body portion 811 positioned on the outer peripheral side from the bottom plate portion 813 side, and the lower body portion 811 and the connecting tube portion 712 of the pipe exterior case 710 are brought into contact with each other. Then, the female screw hole 813B1 of the bottom plate connecting part 813B of the bottom plate part 813 and the screw insertion hole of the cylindrical part 812A of the screw through hole 811B and the mounting cylindrical part 812A corresponding to the screw through hole 811B of the lower body part 811 812A1 is communicated, and screws are screwed together to be assembled together. When screwing, seal the screwed part with heat-resistant caulking material. Further, the exhaust gas pipe 840 is connected to the exhaust gas port 811C of the lower body part 811 by welding or the like. Note that the exhaust pipe 840 may be connected in advance to the lower body portion 811 to be assembled with the bottom plate portion 813.
Furthermore, the refractory heat insulating material 622K is placed on the heating chamber partition plate 622I in the heating chamber 622H of the reforming vessel 622, and the closing plate 622L1 of the rectifying tube 622L is screwed to the connecting screw portion 622J to thereby connect the rectifying tube 622L. Assemble.
Thereafter, the exposed reforming container 622 is attached so as to cover the reforming outer case 610, and the lower case 611 of the reforming outer case 610 is brought into contact with the pipe outer case 710. In this state, the screw into which the lower screw hole 611B of the lower case 611 is fitted is screwed into the mounting female screw portion 613C of the support base 613, and is assembled integrally. Furthermore, the combustion chamber portion 621 is fitted into the heating chamber 622H, and the support flange 621C of the combustion chamber portion 621 is suspended and supported by being superimposed on the burner connection flange 612C of the upper case 612 of the reformed exterior case 610.
Thereafter, the lower heat insulating portion 510 is placed and fixed on the heat insulating material support portion 812, the intermediate heat insulating portion 520 is stacked on the lower heat insulating portion 510 on the same axis, and the upper heat insulating portion 530 is further stacked. Then, the shell 540 is wound around the outer peripheral surfaces of the stacked lower heat insulating portion 510, intermediate heat insulating portion 520, and upper heat insulating portion 530, and the heat insulating portion 500 is configured. Further, the burner unit 151 is placed on the upper case 612, and the upper case 612, the combustion chamber portion 621, and the burner unit 151 are integrally assembled with the mounting bolt 612D, and the reforming unit 300 is assembled.

(Power generation operation of fuel cell system)
Next, the power generation operation in the fuel cell system 100 described above will be described.

First, when the control device acquires a signal related to a power generation request, liquid fuel 111 and air are supplied to the burner unit 151 to heat the reformer 620 to, for example, 500 ° C. or higher. The CO converter 820 and the CO selective oxidizer 830 are appropriately heated by the CO converter electric heater 823 of the CO converter 820 and the CO selective oxidation electric heater 833 of the CO selective oxidizer 830. Then, in a state where the CO converter 820 and the CO selective oxidizer 830 are heated to some extent, the pure water 181 stored in the pure water tank 180 by driving the transport pump 182 is supplied from the water supply path 183 to a part of the water supply path 183. Is supplied to the CO selective oxidation cooling pipe 834 of the CO selective oxidizer 830 and the CO conversion cooling pipe 824 of the CO converter 820 in order through the cooling water pipe 770 constituting the above.
And the combustion gas by the burner unit 151 flows into the inner peripheral side of the opposing rectifying pipe 622L, heats the rectifying pipe 622L, and burns in the outer peripheral surface of the rectifying pipe 622L and the combustion chamber portion 621 from the upper end that expands. It flows between the inner peripheral surface of the cylinder part 621A downward in the vertical direction. At the time of this flow, the turbulent flow part 622L3 flows spirally with respect to the central axis of the reformer 620. By this flow, the rectifying pipe 622L and the combustion cylinder portion 621A are heated. Further, the combustion gas flows upward from the lower end of the combustion cylinder portion 621A between the outer peripheral surface of the combustion cylinder portion 621A and the inner peripheral surface of the reforming vessel 622, and passes through the combustion cylinder portion 621A and the reforming vessel 622. Heat. The combustion gas that has flowed to the upper part of the reforming vessel 622 flows downward between the outer peripheral surface of the reforming vessel 622 and the upper case 612 and flows into the lower case 611. Further, the combustion gas flows from the lower case 611 between the inner peripheral side of the exhaust air passage outer pipe 642 and the outer peripheral side of the reformed water inner pipe 641 of the heat exchange device 640 and flows into the piping unit 700. Further, the combustion gas flowing into the CO removing unit 800 from the piping unit 700 is appropriately heated by the CO converter 820 and the CO selective oxidizer 830 and exhausted from the exhaust gas pipe 840 to the outside. Note that in the state where the CO converter 820 and the CO selective oxidizer 830 are heated by the combustion gas, the heating by the CO converter electric heater 823 and the CO selective electric heater 833 may be stopped.

In this way, the reformer 620 is heated, and the heat exchanger 640, each pipe, the CO converter 820, and the CO selective oxidizer 830 are heated.
The control device drives the transport pump 182 to store the pure water 181 stored in the pure water tank 180 from the water supply path 183 through the reforming water supply pipe 720 constituting a part of the water supply path 183. 640 is supplied to the reformed water inner pipe 641. The supplied pure water becomes steam by heat exchange with the flowing combustion gas, and is supplied to the vaporizer 630 from the second steam connection part 632B of the source gas supply pipe 622S. In addition, although mentioned later for details, the water vapor | steam supplied from the CO removal part 800 is also supplied to the vaporizer | carburetor 630 from the 1st water vapor | steam connection part 632A of source gas supply pipe | tube 622S.
Further, the control device heats the electric heater of the desulfurizer 130 and drives the liquid fuel pump 121 to supply the liquid fuel 111 from the liquid fuel storage tank 110 to the desulfurizer 130 at, for example, about 300 [ml / hour]. To do.

The liquid fuel 111 supplied to the desulfurizer 130 flows into the desulfurization agent container, and the flow velocity distribution in the cross section of the desulfurization catalyst layer (not shown) formed by filling the desulfurization agent container with the desulfurization catalyst is substantially uniform. It is desulfurized while being heated. The desulfurized liquid fuel 111 is mixed with water vapor supplied by the vaporizer 630 and vaporized, and is supplied from the raw material gas supply unit 622R to the reforming vessel 622 as vaporized liquid fuel. The vaporized liquid fuel is reformed by the reformer 620 into a hydrogen-rich fuel gas.
Here, in the flow of the combustion gas of the burner unit 151 in the reformer 620, the heated rectifying pipe 622L heats the reforming vessel 622 to, for example, about 700 ° C. through the combustion cylinder portion 621A by radiant heat. Note that the rectifying pipe 622L is not positioned at the lower end portion of the reforming catalyst layer 622G of the reforming vessel 622, that is, the closing plate 622L1 of the rectifying tube 622L is positioned above the lower end portion of the reforming catalyst layer 622G of the reforming vessel 622. Since it is arranged in a state, the proportion of the upstream side of the reforming catalyst layer 622G due to the radiant heat of the rectifying pipe 622L is reduced. For this reason, the temperature at the lower end of the reforming catalyst layer 622G where the raw material gas flows is somewhat lower than the upper end, and overheating is suppressed. Therefore, the vaporized liquid fuel that has flowed into the lower end of the reforming catalyst layer 622G is reformed over substantially the entire area in the axial direction of the reforming catalyst layer 622G, and is efficiently and stably processed.

Then, the fuel gas reformed by the reformer 620 is supplied from the reformed gas outflow portion 622T to the CO converter 820 and the CO selective oxidizer 830 sequentially, and these CO converter 820 and the CO selector are selected. CO in the fuel gas is transformed and removed by the oxidizer 830 and supplied to the fuel cell 200 from the fuel gas outlet pipe 760 of the reforming unit 300.
Further, the fuel gas supplied to the fuel cell 200 is appropriately humidified by, for example, a humidifier, and then supplied to the negative electrode 202 side of the fuel cell 200. The hydrogen of the fuel gas supplied to the negative electrode 202 side is appropriately humidified as necessary and reacts with oxygen in the air supplied to the positive electrode 201 side of the fuel cell 200 to generate water. DC power is generated between the negative electrodes 202.
The fuel gas containing surplus hydrogen on the negative electrode 202 side is supplied to the burner unit 151 of the reformer 620, for example, and burned.

  On the other hand, for example, when the reforming catalyst layer 622G of the reforming vessel 622 is closed during a power generation operation, the internal pressure in the source gas supply unit 622R reaches a predetermined value or more and is connected to the source gas supply pipe 622S. The safety valve of the raw material return pipe 730 thus operated operates. The safety valve then causes gas phase components such as vaporized liquid fuel gas and reformed gas in the source gas supply unit 622R to flow out of the reforming unit 300 from the source gas supply pipe 622S through the source return pipe 730. In addition, the vaporized liquid fuel generated in the vaporizer 630 is not supplied to the raw material gas supply unit 622R but flows out of the reforming unit 300 through the raw material return pipe 730. In addition, the vaporized liquid fuel etc. which flow out are collect | recovered by the receiving part etc. which were provided separately.

[Effects of fuel cell system]
As described above, in the reforming unit 300 in the fuel cell system 100 of the embodiment, the heat insulating material 511B is provided along the outer peripheral surfaces of the reforming outer case 610, the pipe outer case 710, and the CO removal outer case 810. The outer peripheral surface of the heat insulating material 511B is covered with a shell 540.
For this reason, for example, it is possible to easily hold the heat insulating material 511B in the heat insulating heat retaining position. Furthermore, the heat dissipation rate can be reduced by the shell 540 as compared with the configuration in which the heat insulating material 511B is exposed, and the thermal efficiency can be further improved. Further, the heat insulating material 511B can be protected from external force such as an impact, and the heat insulating material 511B can be prevented from being damaged. Further, the structure in which the lower heat insulating portion 510 is integrally fixed to the heat insulating material support portion 812 can be obtained by a simple method such as screwing from the cylindrical holding portion 812C of the heat insulating material support portion 812 to the shell 540.

And the heat insulation part 500 comprises the lower heat insulation part 510, the intermediate | middle heat insulation part 520, and the upper heat insulation part 530 combining a pair of semicircular arc block-shaped heat insulating material 511B, These lower heat insulation parts 510, intermediate | middle heat insulation part 520 and the upper heat insulating part 530 are connected in the vertical direction to constitute the heat insulating part 500. And the shell 540 has covered each heat insulating material 511B which comprises these lower heat insulation parts 510, the intermediate | middle heat insulation part 520, and the upper heat insulation part 530, respectively.
For this reason, a pair of semicircular arc-shaped heat insulating materials 511B arranged in the circumferential direction of the outer peripheral surface of each case 610, 710, 810 can be easily connected by a simple method such as welding, and further in the vertical direction. An integral connection of the divided lower heat insulating portion 510, intermediate heat insulating portion 520, and upper heat insulating portion 530 can also be obtained by a simple method such as welding.

  The shell 540 is provided integrally with the heat insulating material 511B. For this reason, these shells 540 can be easily attached to the reforming unit 300 only by assembling the heat insulating material 511 </ b> B to the cases 610, 710, and 810. Moreover, since the heat insulating material 511B and the shell 540 can be removed at the time of maintenance of the reforming unit 300, maintenance work and the like can be performed more easily.

Furthermore, the shell 540 is formed of a metal member such as a steel plate.
For this reason, the shells 540 adjacent to each other can be easily connected by welding or the like, and assemblability can be improved. Further, the structure in which the lower heat insulating portion 510 is integrally fixed to the heat insulating material support portion 812 can be obtained by a simple method such as screwing from the cylindrical holding portion 812C of the heat insulating material support portion 812 as described above. The assemblability of the quality unit 300 can be further improved.

A heat insulating portion 500 in which block-shaped heat insulating materials 511B are arranged is provided along the outer peripheral surfaces of the reformed outer case 610, the pipe outer case 710, and the CO removal outer case 810.
For this reason, the reforming unit 300 can be easily assembled and disassembled for maintenance and inspection, and manufacturability can be improved and management such as maintenance and inspection can be easily performed. In particular, a substantially cylindrical heat insulating portion 500 is configured by a heat insulating material 511B having a semicircular arc block shape which is a so-called half shape. For this reason, the modification unit 300 can be assembled and disassembled more easily. In addition, by providing the heat insulating portion 500, the heat does not escape to the outside, the reforming process can be performed efficiently, and the energy efficiency can be further improved.

  In addition, when the intermediate heat insulating portion 520 is disposed, the upper end surface of the intermediate heat insulating portion 520 is higher than the thermal expansion dimension of the reformed outer case 610 having a predetermined dimension from the upper edge of the lower case 611 where the upper end surface is a step. It is configured to be located in For this reason, due to thermal expansion of the unit main body 400 such as the reformed exterior case 610, the upper heat insulating part 530 rides on the lower case 611, and the intermediate heat insulating part 520 and the upper heat insulating part 530 are positioned at the level difference. It is possible to easily prevent the inconvenience that a gap is generated between them and heat loss occurs.

Further, a heat insulating material that protrudes outwardly from the outer peripheral surface in a bowl shape and places and supports the heat insulating portion 500 at the lower portion of the CO removing outer case 810 that is positioned at the lower portion constituting the outer case of the unit main body 400 of the reforming unit 300. A support portion 812 is provided.
For this reason, the heat insulation of the required part of the reforming unit 300 is obtained, the heat insulating part 500 can be minimized, and the displacement of the heat insulating part 500 for heat insulating the required part can be prevented, and reliable heat insulation is simple. Easy to get in configuration.

Further, a burner unit 151 is provided in the upper part of the reforming unit 300 in the vertical direction, and the combustion gas of the burner unit 151 is provided in the lower part of the reforming unit 300 by circulating in the lower part of the reforming unit 300 in the vertical direction. The exhaust gas is exhausted from the exhaust port 811C.
For this reason, by heating the CO converter 820 and the CO selective oxidizer 830 when the combustion gas of the burner unit 151 flows, the thermal energy of the combustion gas can be used effectively and the energy efficiency can be improved.

A reformer 620 is disposed at the upper part of the reforming unit 300, and a CO converter 820 and a CO selective oxidizer 830 are disposed at the lower part. The reformer 620, the CO converter 820, and the CO selective oxidizer are disposed. A pipe portion 700 is provided between the pipe 830 and the pipe 830.
For this reason, the liquid fuel 111 that is the raw material of the fuel gas of the fuel cell 200 and the pure water 181 that is supplied as water vapor are from the middle position of the reforming unit 300, the total length of each pipe is minimized, and the size of the apparatus is reduced. And piping work can be done easily. Furthermore, since the total length of the piping is the shortest, the risk of leakage can be reduced and the manufacturing can be made relatively inexpensively.
Further, the fuel gas outflow pipe 760 is led out from the piping position which is an intermediate position of the reforming unit 300, and the generated fuel gas is caused to flow out to the outside.
For this reason, for example, when the fuel gas is allowed to flow out from the lower portion, the fuel cell 200 is disposed above the flow-out position in the vertical direction, so that the water vapor content in the fuel gas is condensed and the piping is Therefore, a configuration in which fuel gas is stably supplied to the fuel cell 200 can be easily obtained.
Further, a heat exchange device 640 serving as a steam generating means is disposed at an intermediate position of the reforming unit 300, that is, between the reforming vessel 622, the CO converter 820 and the CO selective oxidizer 830. .
For this reason, the temperature in the reforming vessel 622 necessary for reforming, the temperature necessary for generating steam, and the temperature necessary for preheating the CO converter 820 and the CO selective oxidizer 830 are sequentially reduced in the vertical direction. The arrangement relationship is such that the temperature decreases in order from the upper side to the lower side. Therefore, since the temperature required for using the combustion gas of the burner unit 151 is arranged in the order of high temperature, each part can be heated by the combustion gas at an appropriate temperature, and good thermal efficiency can be easily obtained. It is done.

In addition, a burner unit 151 is provided in the upper part, that is, the upper end of the reforming unit 300 in the vertical direction.
Therefore, the burner unit 151 can be easily attached and detached, and management such as maintenance and inspection of the burner unit 151 is facilitated. In particular, by providing it at the upper end, it is only necessary to attach and detach with the mounting bolt 612D, and management such as maintenance and inspection becomes easier, and simplification of the configuration can be easily obtained.
Further, the burner unit 151 is disposed in a state where the combustion gas flows out substantially downward in the vertical direction, and a rectifying pipe 622L is disposed in a state where the combustion gas is located below the burner unit 151 and opens upward. ing.
For this reason, it is possible to prevent liquid from dripping from the burner unit 151 such as liquid dripping from the burner unit 151 and condensation of moisture on the surface of the rectifying pipe 622L when operation is stopped. Therefore, the burner unit 151 can be prevented from being clogged or damaged by dripping, and a stable combustion gas can be generated, and a stable operation can be easily obtained.

Further, the reforming unit 300 includes a reformer 620, a CO converter 820, and a CO selective oxidizer in the reformed outer case 610, the pipe outer case 710, and the CO removal outer case 810 that are integrally connected. 830 and the like are integrated.
For this reason, the reforming unit 300 has a substantially columnar configuration, can reduce the surface area, prevent heat loss, and improve energy efficiency. Furthermore, it becomes easy to heat-treat with the heat insulation part 500 of the simple structure comprised in substantially cylindrical shape, and workability can be improved.

In the reforming unit 300, the position corresponding to the reforming vessel 622 is configured in a substantially circular columnar shape with a small diameter of the upper case 612.
That is, since the thickness of the heat insulating material 511B at the position of the reforming vessel 622 that is the highest temperature is increased, the maximum outer diameter of the reforming unit 300 can be minimized by forming the corresponding portion with a smaller diameter. Can be easily reduced in size.
Furthermore, the outer peripheral surface of the reforming unit 300 is configured in a cylindrical shape without a step, and the appearance can be improved.

Further, as the reforming unit 300, there is no pipe at the bottom for connecting the liquid fuel 111, which is a raw material for the fuel gas of the fuel cell 200, and the pure water 181 supplied as water vapor, or for piping the fuel gas to the outside. In the configuration, that is, piping is performed in the intermediate piping section 700.
For this reason, a pedestal or the like for securing a space for piping at the bottom is not necessary, and the installation space for the reforming unit 300 can be reduced. In particular, piping at the intermediate portion facilitates piping processing, enables raw materials to be brought together in the shortest distance, and facilitates downsizing of the apparatus and improvement of piping work. Further, the reforming unit 300 can be easily arranged in the case when the fuel cell system 100 is unitized.

Further, the CO conversion electric heater 823 of the CO converter 820 and the CO selective oxidation electric heater 833 of the CO selective oxidizer 830 are passed through the bottom plate portion 813 of the CO removal exterior case 810 which is the bottom of the reforming unit 300, respectively. Wiring.
For this reason, it is not necessary to wire the CO conversion electric heater 823 and the CO selective oxidation electric heater 833 through, for example, the heat insulating portion 500, and can be wired to the outside in the shortest time, thereby improving the assembly workability.
Further, the CO conversion electric heater 823 and the CO selective oxidation electric heater 833 are welded to the respective CO conversion containers 821 and the CO selective oxidation containers 831 that pass therethrough and are also welded to the bottom plate portion 813 of the CO removal exterior case 810. Etc.
For this reason, inconvenience due to electric leakage is prevented.

A safety valve is connected between the vaporizer 630 and the connection position of the source gas supply unit 622R in the source gas supply pipe 622S that communicates with the internal space of the source gas supply unit 622R and supplies vaporized liquid fuel to the source gas supply unit 622R. The raw material return part 622S2 to which the raw material return pipe 730 having the above is connected is provided.
For this reason, when the internal pressure in the raw material gas supply unit 622R reaches a predetermined value or more and the safety valve operates, the vaporized liquid fuel and reformed gas in the raw material gas supply unit 622R and the vaporized liquid fuel generated in the vaporizer 630 become raw materials. Since it flows out of the reforming unit 300 via the return pipe 730, even if the reforming process of the vaporized liquid fuel cannot be performed due to, for example, the reforming catalyst layer 622G being blocked, the raw material gas supply unit 622R and the reforming unit It is possible to prevent the reforming unit 300 from being damaged due to an increase in the internal pressure of the quality container 622 or the like. Further, by extending the raw material return pipe 730 from the intermediate position in the vertical direction, the liquid phase component generated by the condensation of the gas phase components in the reformer 620 flowing through the raw material return pipe 730 is discharged without staying. Is easily obtained.

  Further, as the burner unit 151, a liquid fuel supply pipe 651C to which the liquid fuel 111 is supplied is connected to a first air introduction portion 651A into which air is introduced as primary air. For this reason, inconveniences such as the liquid fuel 111 sticking in the burner unit 151 as coke can be prevented. In particular, the liquid fuel supply pipe 651C is connected to a bent portion of the first air introduction portion 651A formed to be bent in a substantially L shape. For this reason, the liquid fuel 111 and primary air are mixed well, coke sticking can be further prevented, and stable combustion can be obtained.

Further, the reforming outer case 610, the pipe outer case 710, and the CO removal outer case 810 that constitute the outer case of the unit main body 400 of the reforming unit 300 are formed into a cylindrical shape with a steel plate, and in particular, a steel sheet wound tube is used. Formed.
For this reason, it can form easily in arbitrary diameter dimensions. Therefore, for example, a configuration in which so-called halved members are combined does not cause inconvenience such as difficulty in combining due to different inner diameters due to dimensional tolerances, etc., and it is formed in a cylindrical shape with an appropriate plate thickness in advance. The outer case can be easily formed by the plate-wrapped tube.

  Then, as the joint portion of the upper connection flange 611A of the lower case 611, the outer peripheral edge of the upper connection flange 611A is bent and joined in a substantially cylindrical shape. In addition, the inner peripheral edge of the upper connecting flange 611A is bent in a substantially cylindrical shape on the opposite side and joined to the upper case 612. Similarly, the outer peripheral edge and the inner peripheral edge of the top plate flange 612A of the upper case 612 are configured to be bent into a substantially cylindrical shape and joined in opposite directions. For this reason, when forming the lower case 611 and the upper case 612, what is necessary is just to sandwich and weld a so-called flange-up joint, and even in the lower case 611 and the upper case 612 formed of thin steel plates, an automatic welder or the like can be used. It can be formed easily by using it, and the productivity can be improved.

Then, as the reformer 620, a substantially annular shape in which the reforming catalyst is filled between the inner cylindrical body 622A and the inner cylindrical body 622A and the outer cylindrical body 622B having a different diameter and having a substantially identical central axis. A reforming container 622 is provided to partition and form a space reforming chamber 622C. A cylindrical combustion cylinder portion 621A having a smaller diameter than the inner cylindrical body 622A of the reforming vessel 622 is disposed in a state where the central axis substantially coincides with the inner peripheral side of the inner cylindrical body 622A. A burner unit 151 is disposed at a position substantially corresponding to one axial end portion of the reforming chamber 622C of the reforming vessel 622 on the inner peripheral side of the portion 621A. Further, a bottomed cylindrical rectifying pipe 622L having a diameter smaller than that of the combustion cylinder 621A and opposed to the burner unit 151 in the axial direction is closed by a closing plate 622L1 on the inner peripheral side of the combustion cylinder 621A. The combustion gas of the burner unit 151 is arranged so that it can flow between the outer peripheral surface and the inner peripheral surface of the combustion cylinder portion 621A in a state where the axes substantially coincide.
As a result, the combustion gas of the burner unit 151 flows into the inner peripheral side of the rectifying pipe 622L from the upper end side that is not closed by the closing plate 622L1, and then flows out from the upper end side so as to turn back, and then combusts with the rectifying pipe 622L. It circulates between cylinder part 621A.
For this reason, for example, when supplying a reformed gas that is a fuel gas as the hydrogen gas used in the fuel cell 200, the capacity for filling the reforming catalyst according to the required supply amount can be relatively easily secured, What is necessary is just to fill a substantially annular space with a reforming catalyst, and workability can be improved. Further, the rectifying pipe 622L is heated and the combustion cylinder 621A located on the inner peripheral side of the reforming vessel 622 is efficiently heated, and the heat of the rectifying pipe 622L is reformed via the heating combustion cylinder 621A. Since the container 622 is heated, the temperature variation in the axial direction of the reforming container 622 is less likely to occur, and the material gas can be efficiently and stably reformed. Furthermore, it is possible to use the combustion cylinder portion 621A that performs good combustion of the burner unit 151, and to provide stable heating to the reforming vessel 622 with a simple configuration in which the cylindrical rectifying pipe 622L is provided.
In addition, a positioning protrusion 622N is provided on the outer peripheral surface of the outer cylindrical body 622B of the reforming vessel 622. Therefore, the combustion gas of the burner unit 151 can be easily positioned with a simple configuration so that the central axis of the reforming vessel 622 is coaxial with the central axis of the reforming unit 300 while ensuring the flow path of the combustion gas. Thus, the substantially uniform heating of the reforming catalyst layer 622G can be easily obtained. In particular, the positioning protrusion 622N is formed such that, for example, a steel plate is bent to form a substantially triangular shape in plan view in the vertical direction, that is, the combustion gas of the burner unit 151 in the vertical direction can flow. For this reason, it is possible to easily prevent the occurrence of the circumferential drift of the combustion gas due to the configuration for positioning the reforming vessel 622 with a simple configuration.

A supply pipe 622Q1 for supplying vaporized liquid fuel to one end side in the axial direction of the reforming chamber 622C of the reforming container 622 is connected to one end in the axial direction of the reforming container 622, and is substantially coaxial in the supply pipe 622Q1. Are inserted into the reforming chamber 622C, and one end of the reforming chamber 622C is disposed in the state of opening the return pipe 622Q2 so that the reformed gas generated on the upper end side in the axial direction in the reforming chamber 622C can flow in. A flow part 622P having a plurality of double pipe parts 622Q having a pipe structure is provided.
Therefore, the supply pipe 622Q1 for supplying the raw material gas to the reforming chamber 622C and the return pipe 622Q2 for circulating and recovering the reformed gas generated by the reforming catalyst in the reforming chamber 622C are substantially coaxial. Since the flow section 622P is provided with a plurality of double pipe sections 622Q having a heavy pipe structure, the configuration for supplying the vaporized liquid fuel and the configuration for collecting the generated reformed gas are one side of the reforming vessel 622. For example, heat insulation of the reforming vessel 622 and interference with other configurations are less likely to occur, and the configuration of the reforming unit 300 can be easily downsized. Further, the vaporized liquid fuel supplied from the supply pipe 622Q1 is heated when the reformed gas generated by being heated to a predetermined temperature flows through the return pipe 622Q2 inserted into the inner peripheral side of the supply pipe 622Q1. Thermal efficiency can be obtained.

Further, the arranged rectifying pipe 622L is configured to supply the vaporized liquid fuel to the state in which the vaporized liquid fuel is circulated in the direction substantially along the axial direction in the reforming chamber 622C by the flow part 622P and to flow out the reformed gas. In the container 622, the rectifying pipe 622L is not opposed to the lower end portion of the inner cylindrical body 622A that corresponds to the upstream side in which the vaporized liquid fuel flows in the reforming chamber 622C, that is, the upstream in which the vaporized liquid fuel flows. The rectifying pipe 622L is disposed so as not to be positioned at the lower end portion of the reforming catalyst layer 622G at a position corresponding to the side.
For this reason, the ratio that the radiant heat from the rectifying pipe 622L heated by the burner unit 151 acts on the upstream side through which the vaporized liquid fuel flows decreases, and overheating at the upstream side through which the vaporized liquid fuel flows in the reforming chamber 622C is prevented. Thus, a substantially uniform and stable reforming process can be obtained for the entire reforming catalyst layer 622G of the reforming chamber 622C, and an efficient reforming process can be easily obtained with a simple configuration.

Then, a rectifying pipe 622L is disposed on a heating chamber partition plate 622I that closes the inner peripheral side of the lower end portion of the inner cylindrical body 622A of the reforming vessel 622 and partitions the heating chamber 622H through a refractory heat insulating material 622K. ing.
For this reason, it is possible to easily prevent the vaporized liquid fuel flowing into the reforming chamber 622C from overheating. Further, the arrangement of the rectifying pipe 622L is such that the rectifying pipe 622L is attached to a connecting screw portion 622J provided integrally with the heating chamber partition plate 622I. Therefore, the rectifying tube 622L can be easily positioned and arranged with a simple configuration.

In the above-described embodiment, the turbulent flow portion 622L3 that is spiral with respect to the central axis is provided between the outer peripheral surface of the rectifying pipe 622L and the inner peripheral surface of the combustion cylinder portion 621A.
For this reason, the combustion gas of the burner unit 151 flowing between the outer peripheral surface of the rectifying pipe 622L and the inner peripheral surface of the combustion cylinder portion 621A flows in a spiral shape with respect to the central axis, and the rectifying pipe 622L and the combustion cylinder The heating efficiency of the part 621A can be improved, and an efficient reforming process can be easily obtained.
And as the turbulent flow part 622L3, it is provided on the outer peripheral surface of the rectifying pipe 622L in a spiral shape protruding toward the inner peripheral surface of the combustion cylinder part 621A.
For this reason, it is possible to easily obtain a helical flow of the combustion gas with a simple configuration such as spirally winding an elongated steel material around the outer peripheral surface of the rectifying pipe 622L, and an efficient reforming process is simple. Easy to get in configuration.

Further, the other end of the supply pipe 622Q1 connected to one end of the reforming vessel 622 in the axial direction is connected to a raw material gas supply unit 622R that has a substantially columnar space therein and into which vaporized liquid fuel flows. Further, the other end of the return pipe 622Q2 having one end opened on the other end side of the reforming chamber 622C is provided adjacent to the source gas supply unit 622R, and a portion of the source gas supply unit 622R is located on the inner peripheral side. The source gas supply unit 622R is connected to the reformed gas outflow part 622T into which the reformed gas is introduced having an annular space.
For this reason, inflow of the vaporized liquid fuel to be supplied into the reforming chamber 622C and recovery of the reformed gas generated by reforming in the reforming chamber 622C are substantially uniform with no drift. Obtained as a distribution state. Therefore, the charged reforming catalyst is used for the reforming process without any bias, and further, the heat exchange efficiency between the raw material gas and the reformed gas is improved, and a good reforming process can be obtained efficiently.

Then, a source gas supply unit 622R to which the supply pipe 622Q1 is connected and the source gas is supplied, and a reformed gas outflow unit 622T to which the return gas 622Q2 is connected and the reformed gas generated in the reforming chamber 622C is supplied. These are substantially cylindrical with substantially the same diameter, and are integrally formed in series.
For this reason, the source gas supply unit 622R and the reformed gas outflow unit 622T having a substantially columnar space are integrally formed in a series with substantially the same diameter, and thus can be formed in series by, for example, partitioning a cylindrical member in the axial direction. Therefore, simplification of the structure and improvement of manufacturability can be easily achieved. Furthermore, for example, by forming a series with substantially the same diameter as the outer cylindrical body 622B of the reforming vessel 622, the configuration can be simplified and the productivity can be improved, and the system configuration with other members can be easily constructed. Thus, the system configuration can be easily reduced in size. In addition, by forming a series, it is possible to easily form an integrated structure that supports the reforming vessel 622 with the source gas supply unit 622R and the reformed gas outflow unit 622T as a pedestal and the flow unit 622P as a support leg. The construction of the configuration can be made easier.
Furthermore, the configuration is such that vaporized liquid fuel is supplied from a source gas supply pipe 622S provided substantially at the center of the source gas supply unit 622R to which source gas is supplied.
For this reason, the supplied raw material gas flows into the raw material gas supply part 622R, flows in the circumferential direction and flows into the supply pipe 622Q1, and a better flow state of the vaporized liquid fuel can be obtained without more uneven flow.

Further, as a unit configuration, both the CO converter 820 and the CO selective oxidizer 830 are incorporated together with the reformer 620.
For this reason, the reformed gas reformed by the reformer 620 is immediately processed by the CO converter 820 and the CO selective oxidizer 830, so that, for example, a configuration for supplying hydrogen gas for the fuel cell 200 can be easily obtained. It can be easily used for home use, and can be easily downsized. In addition, the reforming unit 300 has a unit configuration combined with the heat exchange device 640 and the vaporizer 630. For this reason, better thermal efficiency can be easily obtained, and downsizing can be easily achieved.

Further, as a configuration for generating steam, not only the heat exchange device 640 but also the CO conversion cooling pipe 824 and the CO conversion passage through which pure water 181 that is cooling water for preventing overheating of the CO conversion device 820 and the CO selective oxidizer 830 is circulated. A selective oxidation cooling pipe 834 is provided.
For this reason, it is possible to share a configuration in which a high-temperature reformed gas is cooled for CO conversion and CO removal and a configuration in which steam is generated to prepare raw material gas by mixing with liquid fuel that has been separately desulfurized, Further simplification of configuration and further improvement of thermal efficiency are obtained.
The CO conversion container 821 of the CO conversion device 820 includes a substantially box-shaped CO conversion container main body 821A having one open surface, and a CO conversion container attached by, for example, welding by closing one surface of the CO conversion container main body 821A. It is comprised with the cover part 821B. Similarly, the CO selective oxidation container 831 of the CO selective oxidizer 830 is closed by substantially welding a box-shaped CO selective oxidation container main body portion 831A having one surface open and one surface of the CO selective oxidation container main body portion 831A, for example, by welding. It is comprised with the CO selective oxidation container cover part 831B attached. For this reason, the CO conversion container 821 and the CO selective oxidation container 831 can be easily formed, and the productivity can be improved.
Further, pure water 181 serving as cooling water is circulated from the CO selective oxidation cooling pipe 834 to the CO conversion cooling pipe 824. That is, since the temperature required for CO transformation is higher than the temperature required for CO selective oxidation, cooling is performed in order from the lowest temperature, and each part is cooled by pure water 181 flowing at an appropriate temperature, which is good. Processing is obtained.

The reforming unit 300 described above is used as the fuel cell system 100.
For this reason, a small system configuration capable of generating power efficiently and stably can be provided, and it can be easily used for home use, and the expansion of use can be easily obtained.

[Modification of Embodiment]
The aspect described above shows one aspect of the present invention, and the present invention is not limited to each of the above-described embodiments, and within the scope of achieving the objects and effects of the present invention. Needless to say, variations and improvements are included in the content of the present invention. In addition, the specific structure and shape in carrying out the present invention may be used as other structures and shapes within the scope of achieving the object and effect of the present invention.

That is, as described above, the reforming unit 300 of the present invention has been described as being used in the fuel cell system 100, but may be applied as, for example, a hydrogen gas production apparatus used in the fuel cell system 100. .
Further, as described above, the unit configuration is not limited to a configuration in which all of the heat exchange device 640, the vaporizer 630, the CO converter 820, and the CO selective oxidizer 830 are incorporated.

  Further, in each of the above-described embodiments, as a configuration of supplying the raw material gas to the reforming vessel 622 and outflow of the reforming gas from the reforming vessel 622, for example, the modified portion is not used without using the double-pipe structure circulation portion 622P. Any configuration can be used such as supplying the raw material gas from one end side in the axial direction of the quality container 622 and recovering the reformed gas from the other end side.

Further, although the rectifying pipe 622L is provided, the radiant heat generated by heating the combustion cylinder portion 621A may be used without providing the rectifying pipe 622L.
Furthermore, the turbulent flow part 622L3 may not be provided. Moreover, although the turbulent flow part 622L3 is provided on the outer peripheral surface of the rectifying pipe 622L, for example, it is provided on the inner peripheral surface of the combustion cylinder part 621A or between the outer peripheral surface of the rectifying pipe 622L and the inner peripheral surface of the combustion cylinder part 621A. It may be arranged on the surface.

  Then, a heat insulating material support for supporting and placing the heat insulating portion 500 projecting in a bowl shape on the outer peripheral surface to be open on the lower surface of the CO removing outer case 810 positioned at the lower portion constituting the outer case of the unit main body 400 of the reforming unit 300. Although the portion 812 is provided, the heat insulating material support portion 812 may be formed in any shape such as a hook shape or a plate shape. Moreover, it is good also as a structure by which the heat insulating material support part 812 was provided not only in the lower end part of the exterior case but in the upper end part.

  In addition, although the configuration in which the shell 540 is provided along the outer circumferential surface of the arc of the heat insulating material 511B is shown, for example, the shell 540 may be provided on the entire surface other than the inner peripheral surface in contact with the exterior case of the heat insulating material 511B. Moreover, after providing the heat insulating material 511B along the outer peripheral surface of an exterior case, it is good also as a structure etc. which cover the outer peripheral surface of this heat insulating material 511B with the shell 540.

  Furthermore, after arrange | positioning the several heat insulating material 511B in the state which contact | connects an exterior case, the plate-shaped shell 540 is bent and wound in the state which covers the outer peripheral surface of these heat insulating materials 511B, for example, and the edge of shell 540 It is good also as a structure etc. which are joined by welding etc., for example. In such a configuration, the heat insulating material 511B can be pressed and adhered to the outer case side by the shell 540, and the heat insulating property can be further improved. Further, if the outer periphery of the reforming unit 300 is covered with one shell 540, the gap between the heat insulating materials 511B adjacent in the vertical direction can also be covered with the shell 540, and the heat dissipation of the heat insulating material 511B can be further improved. It can suppress reliably and can improve heat insulation more.

  A configuration in which a cylindrical shell 540 having a diameter larger than the cross-sectional diameter of the outer case is arranged at a predetermined distance from the outer peripheral surface of the outer case, and a heat insulating material is filled between the outer case and the shell 540. It is good. In this case, the heat insulating material is not limited to a block shape, and a fibrous heat insulating material such as glass wool, rock wool, or cellulose fiber may be used, and a liquid or gel heat insulating solvent may be used for the outer case and the shell 540. It is good also as a structure etc. which are made to adhere by a predetermined | prescribed fixing method, after making it fill in between. Even in such a configuration, the same effect as the above embodiment can be obtained, and the heat insulating portion 500 can be easily configured because the heat insulating material is simply filled between the outer case and the shell 540. .

  Furthermore, the opening through which each pipe is inserted was formed by opposing the pipe lower recess 512 and the pipe upper recess 522 formed on the upper end surface of the lower heat insulating portion 510 and the lower end surface of the intermediate heat insulating portion 520, respectively. Not limited to this. For example, the structure which provides a recessed part in the end surface along the axial direction of the semicircular arc-shaped heat insulating material 511B which comprises the lower heat insulation part 510 and the intermediate heat insulation part 520 which cover the piping part 700, and provides an opening by making these recessed parts face, etc. It is good. Moreover, it is good also as a structure etc. which provide the opening corresponding to each piping separately with the some heat insulating material 511B.

  And in the said embodiment, the heat insulating material 511B is formed in a substantially semicircular arc shape, and the heat insulation part 500 is formed by making a pair of heat insulating material 511B oppose the state which an inner peripheral surface contact | connects the outer peripheral surface of an exterior case. However, for example, a plurality of arc-shaped heat insulating materials 511B may be continuously arranged in the circumferential direction along the outer peripheral surface of the outer case to form the heat insulating portion 500.

  Moreover, although the structure which provides the opening for piping in the pipe lower recessed part 512 of the lower heat insulation part 510 and the pipe upper recessed part 522 of the intermediate heat insulation part 520 was illustrated, for example, the lower heat insulation part 510 or the intermediate heat insulation part 520 It is good also as a structure which provides the recessed part for piping in either. In addition, when providing in either one, it is preferable to set it as the structure provided in the intermediate | middle heat insulation part 520 at the point of assembly property.

  In addition, the specific structure and shape in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.

  The present invention relates to a reformed gas containing hydrogen gas by heating with a burner in a reforming catalyst using a raw material gas containing a hydrocarbon raw material such as a liquid fuel such as kerosene or a hydrocarbon raw material gas such as liquefied petroleum gas. It can be used for the reforming process to generate In particular, it can be used for a reformer in a fuel cell system.

1 is a block diagram showing a schematic configuration of a fuel cell system according to the present invention. It is side surface sectional drawing which shows schematic structure of the reforming unit in the said fuel cell system. It is side surface sectional drawing which shows schematic structure in the modification | reformation exterior case of the modification part of the said modification unit. It is a bottom view which shows the modification part of the said modification unit. It is side surface sectional drawing which shows schematic structure of the combustion chamber part of the said modification | reformation part. It is side surface sectional drawing which shows the rectification | straightening pipe | tube of the said modification part. It is a top view which shows the holding | maintenance ring part attached to the outer side cylindrical body of the said modification | reformation container. It is a side view which shows the heat exchange apparatus of the said modification | reformation unit. It is side surface sectional drawing which shows the piping exterior case of the piping part of the said modification | reformation unit. It is a plane sectional view showing the piping exterior case. It is the top view which notched a part which shows the piping state in the piping part of the unit main-body part of the said modification | reformation unit. It is side surface sectional drawing which shows the CO removal exterior case of the CO removal part of the said modification | reformation unit. It is a side view which shows the CO transformer of the said CO removal part. It is the front view which notched a part which shows the said CO transformer. It is a top view which shows the said CO transformer. It is a side view which shows the CO selective oxidizer of the said CO removal part. It is the front view which notched a part which shows the said CO selective oxidizer. It is a top view which shows the said CO selective oxidizer. It is a top view which shows the partition plate of the said CO selective oxidizer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Fuel cell system 111 ... Liquid fuel which is hydrocarbon raw material 130 ... Desulfurizer 151 ... Burner unit as burner 200 ... Fuel cell 210 ... Blower as oxygen-containing gas supply means 300 ... Reformation Unit 500... Heat insulation part 511B .. heat insulation material as heat insulation member 540... Shell as cover plate 610 .. reformed exterior case constituting case body 620... Reformer 710. Case 810 …… CO removal exterior case constituting the case body 812 …… Insulation support 820 …… CO transformer 830 …… CO selective oxidizer

Claims (8)

A reformer for generating a reformed gas containing hydrogen gas (H ₂ ) by heating a source gas containing a hydrocarbon feedstock with a combustion gas of a burner in a reforming catalyst, and the reformer generated by the reformer A reformer gas is supplied to convert a carbon monoxide (CO) in the reformed gas into carbon dioxide (CO ₂ ) by a CO shift catalyst, and the reformed gas treated by the CO shifter is A CO selective oxidizer that oxidizes CO supplied and remaining in the reformed gas to CO ₂ by a CO selective oxidation catalyst,
A case body that houses the reformer, the CO converter, and the CO selective oxidizer;
A heat insulating member provided along the outer peripheral surface of the case body;
A cover plate for covering the outer peripheral surface of the heat insulating member and reinforcing the heat insulating member;
A reforming unit characterized by comprising: The reforming unit according to claim 1,
A plurality of the heat insulating members are continuously arranged along the outer peripheral surface of the case body so as to cover the outer peripheral surface of the case body,
The reforming unit, wherein the cover plate is provided along an outer peripheral surface of each of the heat insulating members. The reforming unit according to claim 1 or 2,
The reforming unit, wherein the cover plate is provided integrally with the heat insulating member. The reforming unit according to claim 1,
A plurality of the heat insulating members are continuously arranged along the outer peripheral surface of the case body so as to cover the outer peripheral surface of the case body,
The cover plate is formed in a substantially cylindrical shape in which a substantially plate-like member is bent so as to cover the outer peripheral surfaces of the plurality of heat insulating members, and the edges of the plate-like members are connected to each other. Reforming unit. The reforming unit according to claim 1,
The case body is formed in a substantially cylindrical shape,
The cover plate is formed in a substantially cylindrical shape surrounding the outer peripheral surface of the case body,
The reforming unit, wherein the heat insulating member is formed by filling a gap space between the case body and the cover plate with a heat insulating material. A reforming unit according to any one of claims 1 to 5,
The case body is formed in a substantially cylindrical shape, and has a mounting portion that protrudes outward at one end portion of the cylinder to hold one end surface of the heat insulating member, and an outer peripheral holding portion that holds an outer peripheral side surface of the heat insulating member. With a thermal insulation support,
The reforming unit, wherein the cover plate is fixed in contact with the outer periphery holding portion of the heat insulating material support portion. A reforming unit according to any one of claims 1 to 6,
The reforming unit, wherein the cover plate is formed of a metal member. A reforming unit according to any one of claims 1 to 7,
An oxygen-containing gas supply means for supplying an oxygen-containing gas;
A fuel cell that generates electric power using the reformed gas generated by the reforming unit and the oxygen-containing gas supplied by the oxygen-containing gas supply means;
A fuel cell system comprising:

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