JP4904880B2 - Fuel cell reformer - Google Patents

Description

  The present invention relates to a reformer for a fuel cell that reforms raw materials such as city gas and LPG to generate a hydrogen-rich gas used in a fuel cell.

  Power generation devices using fuel cells are attracting attention and demand is increasing because they are excellent in environmental conservation and power generation efficiency. In particular, in recent years, the polymer electrolyte fuel cell (PEFC) generates electricity at a low temperature of 100 ° C. or less and has a high output density, so that it can be reduced in size compared with other types of fuel cells. Because of its advantages such as easy start-up, it has come to be used as a power generator for small-scale business use or home use.

  A general configuration of a power generation device (PEFC power generation device) using the polymer electrolyte fuel cell is as shown in FIG. That is, in the fuel cell 1, both surfaces of a solid polymer electrolyte membrane in which a fluorine-based ion exchange membrane is used as an electrolyte are sandwiched between both cathode (air electrode) 2 and anode (fuel electrode) 3 gas diffusion electrodes. The cells are stacked through a separator (not shown) to form a stack. On the inlet side of the anode 3 in the polymer electrolyte fuel cell 1, a fuel processor 4 comprising a reformer 5, a low temperature shift converter 6, a CO selective oxidation reactor (CO remover) 7 in this order, and a humidification A vessel 8 is provided. Thereby, after desulfurizing the raw material (raw fuel) 9 such as city gas (natural gas) and LPG supplied from the fuel supply unit by the desulfurizer 10, the raw material preheater (raw fuel vaporizer) 11 preheats it. Then, it is supplied to the fuel processor 4 together with the steam 13 guided from the water evaporator 12 and heated to about 700 ° C. in the reformer 5 of the fuel processor 4 so that steam reforming is performed. It is. The resulting reformed gas (fuel gas) 14 is led to the low-temperature shift converter 6 and is subjected to a shift reaction by lowering the temperature to about 250 ° C., and further to about 100 to 120 ° C. in the CO selective oxidation reactor 7. The temperature is lowered to perform CO removal treatment. The reformed gas 14 delivered from the fuel processor 4 is humidified by the humidifier 8 and then supplied to the anode 3 of the polymer electrolyte fuel cell 1. On the other hand, air 15 as an oxidizing gas is supplied to the inlet side of the cathode 2 through the humidifier 8 after being pressurized by the air blower 16. In the figure, reference numeral 9 a denotes additional fuel for supplying a part of the raw material 9 to the burner of the reformer 5, 17 an anode off gas, and 18 a cooling part of the fuel cell 1.

  The reformer 5 in the fuel processor used in the fuel cell power generator as described above generates hydrogen-rich gas to be supplied to the fuel cell 1 from the raw material such as city gas as described above. As a configuration, there is a configuration using a vertically long reaction tube as shown in FIG.

  That is, the reformer using the reaction tube shown in FIG. 5 is inserted into the outer cylinder 20 concentrically with the cylindrical outer cylinder 20 extending in the vertical direction and closed at the lower end (tip). A plurality of reaction tubes 19 each having an inner cylinder 21 and a reforming catalyst 22 filled between the inner cylinder 21 and the outer cylinder 20 are arranged in parallel in a container not shown. A reforming raw material gas 23 is allowed to flow in the catalyst 22 of the reaction tube 19, and a heating fluid 25 is allowed to flow outside each reaction tube 19. 24 is steam reformed. An example of each reaction tube 19 used in the reformer is shown in FIG. 5. The outer cylinder 20 has an upper end (base end) 26 opened and a lower end (tip end) 27 at a cap 28. It is sealed. The inner cylinder 21 is inserted into the outer cylinder 20 from above, and is positioned at the lower end portion of the outer cylinder 20 with the lower end (tip) 29 opened. The inner cylinder lower end 29 and the outer cylinder lower end 27 A plate-like catalyst support material 30 is attached between the outer cylinder 20 and the inner cylinder 21 between the outer cylinder 20 and the inner cylinder 21 above the catalyst support material 30.

  Further, the upper end 31 side of the inner cylinder 21 is extended upward from the position of the upper end 26 of the outer cylinder 20 and is connected to the reformed gas header together with the upper ends of the inner cylinders 21 of the other reaction tubes 19 (not shown). It is.

  Furthermore, a plug 32 having an outer diameter smaller than the inner diameter of the inner cylinder 21 is inserted and arranged inside the lower end side of the inner cylinder 21 so that the passage of the reformed gas 24 when passing through the inner cylinder 21 is interrupted. The area is controlled at a high temperature part (see, for example, Patent Document 1).

  The reforming action of the reforming raw material gas 23 in the reaction tube 19 shown in FIG. 5 is a mixture of the reforming raw material gas 23 introduced through the space between the upper end 26 of the outer cylinder 20 and the inner cylinder 21 and steam. While flowing through the catalyst 22 downward, the reforming reaction is carried out by absorbing the heat of the heated fluid 25 flowing outside the reaction tube 19 in the direction of the arrow. The reformed gas 24 passes through the pores of the catalyst support material 30 and is discharged downward, and then enters the inner cylinder 21 from the lower end of the inner cylinder 21 that is reversed and opened, and then rises and discharges. Is done. During this time, the passage speed of the reformed gas 24 flowing through the inner cylinder 21 changes due to the plug 32 in the inner cylinder 21 in the high temperature portion of the reforming reaction section, and the inner cylinder from the reformed gas 24 flowing through the inner cylinder 21. The amount of heat transfer to the reforming raw material gas 23 that flows outside the control unit 21 can be controlled.

  Further, as a conventional reforming apparatus, a reforming gas is returned, and as shown in FIG. 6, a reaction gas 34 in which a catalyst is filled inside the reforming pipe 33 and a reforming raw material gas and water vapor are mixed. The flow path 36 for returning the reformed gas 35 to the axial center of the reforming tube 33 is formed, and the inside of the reforming tube 33 is filled with a ruthenium catalyst 37 and a nickel catalyst 38. A catalyst two-layer packed reformer has also been proposed (see, for example, Patent Document 2).

JP-A-11-169702 Japanese Patent Laid-Open No. 8-48501

  However, what is described in Patent Document 1 is that the reaction tube 19 of the reformer itself is a reforming reaction section over almost the entire length, and is collected in a reformed gas header at the top (not shown). The reformed gas 24 is in a high temperature state. Further, the plug 32 inserted in the inner cylinder 21 in the high temperature portion of the reforming reaction section of the reaction tube 19 controls the passage cross-sectional area of the reformed gas 24 flowing through the inner cylinder 21 to the reforming raw material gas 23. The heat transfer area is changed to control the amount of heat transfer, but it is not used in a place where the reformed gas temperature is low. Further, Patent Document 1 also describes that heat transfer promoting particles are provided outside the upper end portion of the reaction tube 19, and the heat transfer promoting particles are heated by the heating fluid 25 that circulates outside the reaction tube 19. However, it does not promote heat transfer from the reformed gas 24 to the reforming raw material gas 23.

  In addition, what is described in Patent Document 2 is one in which a catalyst is laminated in two layers for the purpose of preventing carbon deposition, and the outlet temperature of the reformed gas is set to 400 to 550 ° C.

  When used as a reforming device of a polymer electrolyte fuel cell power generator, the polymer electrolyte fuel cell power generator has a low temperature downstream of the reformer, as is apparent from the system configuration example shown in FIG. A shift converter (LTS) 6 is connected. The inlet temperature of the low temperature shift converter 6 is around 250 ° C., and the sensible heat recovery of the reformed gas is required to lower the reformed gas temperature generated by reforming at a high temperature to about 250 ° C. Although it is necessary, in the conventional proposals described above, there is no disclosure or suggestion of reducing the temperature to such a temperature by sensible heat recovery. Further, neither Patent Document 1 nor Patent Document 2 discloses a catalyst scattering prevention, a catalyst replacement method, or the like.

  Accordingly, the present invention provides a fuel cell having a reforming tube that can effectively recover the sensible heat of the reformed gas to increase the temperature of the reforming raw material gas and lower the outlet temperature of the reformed gas. It is intended to provide a reforming apparatus for industrial use.

In order to solve the above problems, the present invention has a reforming reaction section and a reforming preheating section in the longitudinal direction, and the reforming reaction section includes an upper outer cylinder whose upper end is closed and whose lower end is opened. And a reforming catalyst filled on a catalyst support plate provided between the elongated small diameter return pipe inserted into the upper outer cylinder through the lower end opening and the lower end of the upper outer cylinder. The reforming preheating section includes a lower outer cylinder having a smaller diameter than the upper outer cylinder and a larger diameter than the return pipe and having a reforming raw material gas inlet at a lower end, and an upper end of the lower outer cylinder. Is fixed to the central opening of the connecting plate whose outer periphery is fixed to the lower end opening of the upper outer cylinder of the reforming reaction section, and the lower end of the lower outer cylinder is fixed to the outer peripheral surface on the lower end side of the return pipe. is fixed to, the reformed raw material gas reforming raw material gas flowing from the inlet the lower outer cylinder and litter It shall be formed by forming a reforming raw material gas flow path so as to increase the space between the tubes, so as to circulate the reformed raw material gas from the reformed raw material gas flow path of the reforming preheater to the reforming reaction portion In addition, the reformed gas is allowed to flow inside the return pipe, and an insert having a length reaching from the reforming preheating part side to a part of the reforming reaction part is inserted into the return pipe. Then, the sensible heat of the high-temperature reformed gas flowing through the return pipe is recovered in the reforming reaction section, and the sensible heat of the reformed gas that has fallen in temperature is further passed through the reforming raw material gas flow path of the reforming preheating section. It shall have the structure provided with the reforming pipe | tube which can be collect | recovered by heat exchange with the reforming source gas which distribute | circulates .

Further, a configuration in which as the reforming reaction unit that put the above configuration, the upper end of the upper outer cylinder sealable to allow opening and closing in the upper cover.

Further, a catalyst fall prevention plate having pores through which only the gas passes is attached to the inlet portion of the return pipe where the reformed gas enters.

According to the fuel cell reforming apparatus of the present invention, the following excellent effects can be obtained.
(1) A reforming reaction section and a reforming preheating section in the longitudinal direction, the reforming reaction section having an upper outer cylinder whose upper end is closed and whose lower end is opened, and a lower end opening into the upper outer cylinder And a reforming catalyst filled on a catalyst support plate provided between an elongated return pipe having an elongated diameter and a lower end portion of the upper outer cylinder. A lower outer cylinder having a diameter smaller than that of the upper outer cylinder and larger than that of the return pipe and having a reforming raw material gas inlet at a lower end thereof, the upper end of the lower outer cylinder being connected to the upper portion of the reforming reaction section The reforming raw material is fixed to the central opening of the connecting plate having an outer peripheral portion fixed to the lower end opening of the outer cylinder, and the lower end of the lower outer cylinder is fixed to the outer peripheral surface on the lower end side of the return pipe. reforming as reforming raw material gas flowing from the gas inlet increases between the lower outer cylinder and the return pipe Material gas flow path is formed and made to, as well as to circulating the reforming raw material gas from the reformed raw material gas flow path of the reforming preheater to the reforming reaction portion, reforming the inside of the return pipe A high-temperature gas that circulates in the return pipe is inserted and arranged in the return pipe so that the quality gas is circulated and the length of the insert that reaches from the reforming preheating part side to a part of the reforming reaction part is inserted. The sensible heat of the reformed gas is recovered in the reforming reaction section, and the sensible heat of the reformed gas that has fallen in temperature is further exchanged with the reformed source gas flowing in the reformed source gas flow path of the reforming preheating section. Since it has a configuration with a reforming pipe that can be recovered, the reforming raw material gas can be preheated in the reforming preheating section and introduced into the reforming reaction section, and in addition, in the return pipe of the reforming reaction section Of endothermic reforming reaction heat by recovering sensible heat of hot reformed gas flowing through Supplement, can contribute to the reforming reaction promotion. Along with this, the high temperature reformed gas can be reliably reduced by sensible heat recovery, for example, from a high temperature of around 700 ° C. to an intermediate temperature of around 550 ° C. at the outlet of the reforming reaction section. Furthermore, since the reforming reactor is heat transfer rate limiting, heat is transferred to the reforming reaction section from the outside by the upper outer cylinder and from the inner side by the return cylinder, so that the heat transfer area can be marginalized and improved. Pellets can be gathered compactly.
(2) In addition, as in the above (1), modifying the preheating section is provided with a lower outer cylinder having the reformed raw material gas inlet to the lower end, the upper end of the lower outer cylinder, the upper portion of the reforming reaction unit The reforming raw material is fixed to the central opening of the connecting plate having an outer peripheral portion fixed to the lower end opening of the outer cylinder, and the lower end of the lower outer cylinder is fixed to the outer peripheral surface on the lower end side of the return pipe. The reforming material gas flow path is formed so that the reforming material gas flowing in from the gas inlet rises between the lower outer cylinder and the return pipe, and the reforming material gas flow in the reforming preheating section is formed. The reforming raw material gas is circulated from the passage to the reforming reaction section, and the reformed gas is circulated inside the return pipe to reform the sensible heat of the reformed gas descending the return pipe. because are a structure in which to be recovered by heat exchange with the feed gas, the 550 ° C. of about And can be lowered to a temperature of the reformed gas to around 250 ° C. in heat exchange with the reformed raw material gas can be optimized inlet temperature of the low-temperature shift converter.
(3) The reforming reaction section is configured so that the upper end of the upper outer cylinder can be sealed with an upper lid so that the reforming catalyst can be replaced easily and in a short time. .
(4) By adopting a structure in which a catalyst fall prevention plate having pores for allowing only gas to flow into the return pipe into which the reformed gas enters is installed, the reformed gas blown up by the reformed gas and scattered in the reforming reaction section. A part of the quality catalyst can be prevented from entering the return pipe, and the outflow of the reforming catalyst can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an outline of an embodiment of the present invention. A reforming pipe 39 having a reforming reaction section 40 and a reforming preheating section 41 is provided, and the reforming pipes 39 are arranged in a container (not shown). Then, the reforming raw material gas 42 is allowed to flow along with steam from the lower ends of the reforming tubes 39 in the order of the reforming preheating unit 41 and the reforming reaction unit 40, while the heating fluid 44 is outside the reforming tubes 39. The reformed raw material gas 42 is steam reformed in the reforming tube 39 by absorbing the heat of the heating fluid 44.

  More specifically, the upper end of the upper outer cylinder 45 having a required diameter and length (height) is closed with the upper lid 46, only the lower end is opened, and the shaft center portion is elongated through the lower end opening of the upper outer cylinder 45. The return pipe 47 as an inner cylinder having a small diameter is inserted and arranged concentrically. An upper end edge of the outer periphery of the dish-like connecting plate 48 having an opening 49 at the center is brought into contact with the lower end opening of the upper outer cylinder 45 and fixed in the circumferential direction by welding or the like. The upper end of the lower outer cylinder 50 having a smaller diameter than the upper outer cylinder 45 and a larger diameter than the return pipe 47 and having the reforming raw material gas inlet 51 formed at the lower end is brought into contact with the inner peripheral edge of 48. The upper outer cylinder 45 and the lower outer cylinder 50 are integrated with each other through a dish-like connecting plate 48 by being fixed in the circumferential direction by welding or the like.

  In addition, the lower end portion of the lower outer cylinder 50 is fixed to the outer peripheral surface on the lower end side of the return pipe 47 in a sealed state, and all the reforming raw material gas 42 flowing from the reforming raw material gas inlet 51 is completely removed. The reforming source gas channel 52 is provided so as to rise between the return pipe 47 and the reforming source gas channel 52 is formed as the reforming preheating unit 41.

  At a position above the reforming raw material gas flow path 52, that is, at the position of the dish-like connecting plate 48, a punch plate, a firing plate having a large number of pores that allow gas to pass but not catalyst. The catalyst support plate 53 made of a metal, ceramic fiber, etc. is connected to the outer surface of the return pipe 47 and the inner surface of the dish-like connecting plate 48 or the upper outer cylinder 45 (FIG. 1 shows the case of the dish-like connecting plate 48). The reforming catalyst 54 is filled between the upper outer cylinder 45 and the return pipe 47, and the upper part of the catalyst support plate 53 is used as a catalyst layer so that the inside of the upper outer cylinder 45 is provided. The part filled with the reforming catalyst 54 is used as the reforming reaction part 40.

  In addition, a catalyst fall prevention plate 55 having a large number of pores and allowing only gas to pass therethrough is attached to the upper end of the return pipe 47 in the reforming reaction section 40 and modified. After the raw material gas 42 rises in the catalyst 54 and is reformed, it exits the catalyst layer, reverses and enters the return pipe 47, and the blown up and scattered catalyst 54 falls into the return pipe 47. I try to prevent it.

  Further, heat transfer promoting inserts 56 are inserted and arranged in the entire region of the reforming preheating unit 41 in the return pipe 47 and the reforming preheating unit 41 side region of the reforming reaction unit 40. At this time, the reason why the insert 56 is not inserted so as to extend over the entire length of the return pipe 47 is that it is preferable to limit the insert 56 only to a region where a large heat flux is required because the pressure loss of the reformed gas can be suppressed. .

  The upper lid 46 attached to the upper end of the upper outer cylinder 45 can be opened and closed by excising the welded portion, but the upper outer cylinder 45 is sealed when attached.

Since the reforming pipe 39 in the reforming apparatus of the present invention has the above-described configuration, when reforming the reforming material gas 42, the reforming material gas inlet at the lower end of the lower outer cylinder 50 in the reforming preheating unit 41 is performed. A reforming raw material gas 42 which is mixed with water vapor is introduced from 51. The reformed raw material gas 42 that has flowed in rises along the reformed raw material gas flow path 52 and is introduced into the upper outer cylinder 45 that constitutes the reforming reaction section 40. Since the catalyst support plate 53 is provided at the lower end of the upper outer cylinder 45 and the reforming catalyst 54 is filled on the upper side thereof, the reforming raw material gas 42 passes through the pores of the catalyst support plate 53. It passes through the layer of reforming catalyst 54 and is raised as shown by the arrow while passing between the catalysts.
The reforming catalyst 54 has a ball shape with a particle size of about 3 mm, and the reforming raw material gas 42 is circulated while being in contact with the catalyst 54.

  Since the heating fluid 44 flows outside the upper outer cylinder 45 of the reforming reaction section 40, the reforming raw material gas 42 passing through the reforming reaction section 40 is modified by the heat of the external heating fluid 44. An endothermic reaction is performed in the quality reaction unit 40 to reform the hydrogen-rich reformed gas 43.

  While passing through the reforming preheating section 41 and the reforming reaction section 40, the temperature of the reforming raw material gas 42 changes as shown by a broken line in FIG. That is, the temperature is raised from around 250 ° C. at the reforming raw material gas inlet 51 to around 500 ° C. at the reforming preheating unit 41, and the temperature drops slightly after entering the reforming catalyst 54 of the reforming reaction unit 40. A high temperature of about 700 ° C. is reached by absorbing the heat of the heating fluid 44 outside the reaction section 40 and performing a reforming reaction. As a result, the reforming raw material gas 42 is reformed and a hydrogen-rich reformed gas 43 is generated. The reformed gas 43 of about 700 ° C. generated in this way is sent to the low temperature shift converter 6 (see FIG. 4) before being supplied to the fuel cell, so that the inlet temperature of the low temperature shift converter 6 is set to about 250 ° C. There must be.

  In the present invention, since the return pipe 47 as an inner cylinder is inserted inside the reforming reaction section 40 and the reforming preheating section 41, the reformed gas 43 reformed in the reforming reaction section 40 is converted into the catalyst 54. Then, it is reversed and passes through the narrow hole of the catalyst fall prevention plate 55 and enters the return pipe 47 to be returned. During this time, the sensible heat of the high temperature reformed gas 43 is recovered by the endothermic reaction of the reforming reaction section 40 and the temperature is lowered to around 550 ° C. Subsequently, the sensible heat of the medium-temperature reformed gas 43 that has reached around 550 ° C. is recovered by heat exchange with the reforming raw material gas 42 in the reforming preheating unit 41. In this way, the reformed gas 43 is recovered by collecting high-temperature sensible heat while passing through the reforming reaction section 40 of the reforming pipe 39 and the return pipe 47 provided at the center of the reforming preheating section 41. It becomes possible to set it as about 250 degreeC in an exit part.

  In the present invention, the heat transfer promoting inserts 56 are inserted and arranged in the entire region of the reforming preheating unit 41 and a partial region of the reforming reaction unit 40 in the return pipe 47. In the region where the product 56 is disposed, the reformed gas flow path section is narrowed, so that the flow rate of the reformed gas 43 is increased, and heat transfer from the reformed gas 43 to the reformed raw material gas 42 is promoted. As a result, the temperature of the reforming raw material gas 42 in the reforming preheating unit 41 is increased in accordance with the sensible heat recovery of the reforming gas 43 from about 550 ° C. to about 250 ° C. However, the temperature of the reforming raw material gas 42 is a smooth curve due to the sensible heat recovery of the reformed gas 43 from about 700 ° C. to about 550 ° C. and by the heat transfer enhancement by the insert 56. The temperature of the reformed gas 43 can be adjusted so as to follow the temperature curve of the reformed gas 43 shown by the solid line in FIG.

  In the above, in order to further enhance heat transfer by the insert 56, the reformed gas 43 swirls around the surface of the insert 56 by winding thin wires, fins 57, etc. spirally as shown in FIG. However, the sensible heat recovery of the reformed gas 43 can be efficiently performed by making it flow, by providing irregularities on the surface of the insert 56, or by making the surface rough. .

  Further, when the reformed gas 43 reformed in the reforming reaction section 40 is reversed and enters the return pipe 47, if the reforming catalyst 54 blown up and scattered falls into the return pipe 47, There is a possibility that the flow of the reformed gas 43 may become an obstacle, and a reforming reverse reaction around the dropping position may occur, which may reduce the reforming rate.

  In this regard, in the present invention, since the catalyst fall prevention plate 55 is attached to the upper end of the return pipe 47, even if the reforming catalyst 54 blown up by the reformed gas 43 falls above the return pipe 47, It can be received on the catalyst fall prevention plate 55 and prevented from falling into the return pipe 47. Thereby, the above-mentioned fear can be prevented beforehand.

  Further, the reforming catalyst 54 may be deteriorated by a reforming reaction over a long period of time, and there is no mixing of steam due to an operation failure in steam reforming, and only the reforming raw material gas 42 enters the reforming reaction unit 40. If it enters, the reforming catalyst 54 may be broken and formed into powder due to carbon deposition, which may cause clogging of the reforming catalyst powder.

  In such a case, the reforming catalyst 54 must be replaced. In the case of a conventionally used reformer, the replacement of the reforming catalyst 54 is not easy, and the reforming catalyst 54 is replaced by carefully dismantling without damaging each device. Therefore, it took a long time.

  In the present invention, the upper end of the reforming reaction unit 40, that is, the upper end of the upper outer cylinder 45 is opened in a sealed state so that the reforming reaction unit 40 can be opened upward. Since it is configured, when it is necessary to replace the reforming catalyst 54, the upper lid 46 is removed as shown in FIG. Next, a suction pipe 58 of a suction device such as a vacuum cleaner is inserted between the upper outer cylinder 45 and the return pipe 47 so that the reforming catalyst 54 is blown out. As described above, the reforming catalyst 54 is in the shape of a ball having a particle size of about 3 mm and can be sucked out easily.

  When all the old reforming catalyst 54 is sucked out in this way, a new reforming catalyst 54 is injected between the upper outer cylinder 45 and the return pipe 47 from above and filled. As a result, it is possible to easily and quickly replace the reforming catalyst, which has been a difficult task in the past.

  After the filling of the new reforming catalyst 54 is completed, the upper lid 46 is put on the upper end of the upper outer cylinder 45 and sealed by welding or the like.

  The present invention is not limited to the above embodiment. For example, the insertion length of the insert 56 inserted into the return pipe 47 into the reforming reaction unit 40 is the length of the reforming raw material gas 42. It is only necessary to promote heat transfer when the temperature decreases, and the present invention is not limited to the illustrated position. Of course, various modifications can be made without departing from the scope of the present invention.

It is a schematic sectional drawing which shows one Embodiment of the reforming pipe | tube in the reforming apparatus of this invention. It is a figure which shows the temperature condition of the reforming raw material gas and reformed gas of the reforming preheating part and reforming reaction part in this invention. It is a figure which shows the state which has taken out the old reforming catalyst at the time of reforming catalyst replacement | exchange. 1 is a system configuration diagram of a solid polymer fuel cell power generator. FIG. It is sectional drawing which shows an example of the reaction tube of the conventional reformer. It is sectional drawing of the reforming pipe | tube of the conventional reforming apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell 39 Reforming pipe 40 Reforming reaction part 41 Reforming preheating part 42 Reforming raw material gas 43 Reforming gas 44 Heating fluid 45 Upper outer cylinder 46 Top cover 47 Return pipe
48 Plate-shaped connecting plate (connecting plate)
49 Opening 50 Lower outer cylinder 51 Reforming raw material gas inlet 52 Reforming raw material gas flow path 53 Catalyst support plate 54 Reforming catalyst 55 Catalyst fall prevention plate (plate)
56 Interpolation

Claims (3)

A reforming reaction part and a reforming preheating part are provided in the longitudinal direction, and the reforming reaction part is inserted into the upper outer cylinder through the lower end opening, with the upper end closed and the lower end opened. A reforming catalyst filled on a catalyst support plate provided between an elongated small-diameter return pipe and a lower end portion of the upper outer cylinder, and the reforming preheating portion is formed by the upper outer cylinder. A lower outer cylinder having a smaller diameter and a larger diameter than the return pipe and having a reforming raw material gas inlet at the lower end, and the upper end of the lower outer cylinder is connected to the upper outer cylinder of the reforming reaction section. The lower end of the lower outer cylinder is fixed to the outer peripheral surface on the lower end side of the return pipe, and is fixed to the central opening of the connecting plate having the outer periphery fixed to the lower end opening. reforming material gas as reforming raw material gas flowing to rise between the lower outer cylinder and the return pipe Shall by forming a flow path, as well as to circulating the reforming raw material gas from the reformed raw material gas flow path of the reforming preheater to the reforming reaction portion, the reformed gas to the inside of the return pipe And insert an insert having a length reaching from the reforming preheating part side to a part of the reforming reaction part into the return pipe, and the high temperature reforming that circulates in the return pipe. the sensible heat of the gas is recovered in the reforming reaction unit can be recovered by heat exchange with the reforming raw material gas flowing in the reformed raw material gas flow path of further reforming preheater sensible heat of the lowered reformed gas temperature A reformer for a fuel cell, characterized in that it has a configuration including a certain reforming tube. Reformer reformer of claim 1 Symbol placement was to be sealed to the upper end of the upper outer cylinder can be opened and closed by the upper cover of. The reformer for a fuel cell according to claim 1 or 2 , wherein a catalyst fall prevention plate having a pore through which only the gas passes is attached to an inlet portion of the return pipe into which the reformed gas enters.

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