JP2016130197A - Spiral waveform cylinder, hydrogen generation apparatus comprising the same, and producing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrogen generation apparatus in which cut-off and destruction hardly occur at an attachment part of a flow path of an evaporator.SOLUTION: There is provided a spiral waveform cylinder 1 for an evaporator of a hydrogen generation apparatus, in which sidewall is machined so that the sidewall forms spiral uneven part directing to axis direction, which comprises second projecting part 4 deformed so as to project in periphery direction at peak part of a projecting part 2, surface pressure of attachment part is increased by squashing at least a part of the second projecting part 4 when the spiral waveform cylinder is attached to an inner peripheral surface of an outer syringe, and stress on the spiral waveform cylinder 1 may be distributed.SELECTED DRAWING: Figure 1

Description

  The present invention reforms a hydrocarbon-based raw material gas such as city gas or LPG, produces a hydrogen-rich reformed gas, and a hydrogen generator used for producing a fuel gas for a fuel cell power generator, etc. The present invention relates to a spiral corrugated cylinder used in an evaporation section of the hydrogen generator and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, in a fuel cell system, there is known a hydrogen generator that generates hydrogen from a raw material gas such as city gas or LPG and steam by a steam reforming reaction and uses the reformed gas to be supplied to a power generation stack. The steam used for the steam reforming reaction is generated by evaporating the reformed water using an evaporator.

  As this evaporator, an evaporator that can efficiently evaporate the reforming water by combining a cylindrical tube to form a spiral flow path is known. FIG. 10 is a longitudinal cross-sectional view showing a main configuration of a conventional evaporator.

  As shown in FIG. 10, in the conventional evaporator 120, a cylindrical body 122 is disposed so as to cover the inner spiral corrugated tube 121 and its outer periphery. The inner spiral corrugated tube 121 is formed with irregularities that spiral in the axial direction. As a result, a flow passage 120 a is formed in the gap between the inner spiral corrugated tube 121 and the cylindrical body 122. A guide tube 113 is disposed on the inner peripheral side of the inner spiral corrugated tube 121 with a gap.

  The raw material gas 101 and the reformed water 102 are supplied to the flow passage 120a. Further, the combustion exhaust gas 106 is supplied from the burner to the gap between the inner spiral corrugated tube 121 and the guide tube 113.

  The reformed water 102 is heated by exchanging heat with the combustion exhaust gas 106 while circling around the spiral flow passage 120a to become steam 102a. Similarly, the source gas 101 is heated and mixed with the water vapor 102a. As a result, the mixed gas of the source gas 101 and the water vapor 102a heated to a high temperature is discharged from the evaporator 120.

  Thereafter, the mixed gas is sent to the reforming section, and hydrogen is generated by a steam reforming reaction by the action of the reforming catalyst. At this time, the efficiency of the reaction increases because the mixed gas is further mixed and heated.

  As described above, the conventional evaporator 120 comes into surface contact with the heated gas and the liquid via the inner spiral corrugated tube 121, so that it can be efficiently heated while having a simple structure.

JP 2007-139404 A

  However, according to the conventional technique, there is a possibility that a gap is formed in the close contact portion between the inner spiral corrugated tube 121 and the cylindrical body 122, and the reforming water 102 may short-cut the spiral flow passage 120a.

  As a method of bringing the inner spiral corrugated tube 121 and the cylindrical body 122 into close contact, the inner spiral corrugated tube 121 is inserted into the cylindrical body 122 that has been heated and thermally expanded in advance, and the cylindrical body 122 is brought into close contact by thermal shrinkage. These means are used.

  In this case, the inner peripheral surface of the thermally contracted cylindrical body 122 is in close contact with the apex of the convex portion 123 in the spiral unevenness of the inner spiral corrugated tube 121, and a surface pressure is generated in the close contact portion.

  When the surface pressure of the close contact portion is low, there is a possibility that a shortcut of the reforming water 102 occurs. For example, a temperature difference may be generated between the inner spiral corrugated tube 121 and the cylindrical body 122 at the time of start-up or operation stop, and the cylindrical body 122 may be more thermally expanded to lower the surface pressure.

  In such a case, a gap may occur when the initial surface pressure is low. In addition, when the raw material gas 101 is introduced at a high pressure and the reforming water 102 rapidly evaporates, the internal pressure of the gas in the flow passage 120a becomes high, and there is a possibility that a close contact is lost and a gap is generated. When the reforming water 102 is short-cut, it is sent to the reforming section without completing evaporation, and the reforming catalyst is wetted and deteriorated, thereby reducing the performance.

  In addition, when an exothermic catalyst (for example, a shift catalyst, a CO removal catalyst) is disposed adjacent to the evaporation section and cooled by heat exchange, the cooling becomes insufficient due to the shortcut of the reforming water 102, and the exothermic catalyst. There is a risk that thermal runaway will occur when the temperature of the battery continues to rise. Thus, the shortcut of the reforming water 102 reduces the performance of the hydrogen generator.

  The same problem occurs in the contact method other than shrink fitting in Patent Document 1. On the other hand, another problem arises when increasing the surface pressure of the close contact portion. FIG. 11 is a longitudinal cross-sectional view showing a main part configuration in a modification of the conventional evaporator.

  The evaporator 130 includes an inner spiral corrugated tube 131 and a cylindrical body 122. As means for increasing the surface pressure of the close contact portion, in the inner spiral corrugated tube 131, the R (curvature radius) of the convex portion 133 is reduced, and the rigidity of the convex portion 133 is increased.

  However, as a result of increasing the rigidity of the convex portion 133, a high stress is generated at the root 135 of the convex portion without the load being dispersed. Since the convex portion 133 has high rigidity, the convex portion 133 is hardly deformed even by a load applied to the inner spiral corrugated tube 131 when the cylindrical body 122 is brought into close contact therewith.

  As a result, the load is transmitted almost as it is to the recess 134, and the load is dispersed by the deflection of the recess 134. In particular, a high shear stress is generated by a load that is not dispersed at the root 135 of the convex portion. When shear stress is repeatedly applied, the portion is easily broken.

  If starting and stopping are repeated in this state, the inner spiral corrugated tube 131 may be broken. When the inner spiral corrugated tube 131 is broken, the operation of the hydrogen generator cannot be continued.

  In the convex part 123 of FIG. 10, since R (radius of curvature) is comparatively large, the convex part 123 whole can bend, and a load is disperse | distributed. As a result, it is difficult for stress to concentrate on the base of the convex portion 123. On the other hand, in the convex part 133 of FIG. 11, since R (radius of curvature) is comparatively small, a load is not disperse | distributed but stress will concentrate on the root 135 of a convex part.

  As described above, the conventional technology has a problem that the evaporator of the hydrogen generator may be broken when the configuration is adopted in which the contact pressure is increased to prevent the shortcut.

Accordingly, the present invention solves the above-described conventional problems, and maintains a high surface pressure at the close contact portion of the flow path, does not generate a shortcut, and can provide an evaporator that is unlikely to break down. It aims at providing a pipe | tube, the hydrogen production | generation apparatus provided with the same, and its manufacturing method.

  In order to solve the above-mentioned conventional problems, the spiral corrugated tube for the evaporator of the hydrogen generator of the first invention is such that the side wall has spiral irregularities in the axial direction, and the apex portion of the convex portion has an outer circumferential direction. It is characterized by comprising a second convex part which is deformed so as to protrude.

  By using this spiral corrugated tube, it is possible to provide an evaporator in which shortcuts are unlikely to occur in the spiral flow path and are not easily broken.

  In order to solve the above-described conventional problem, the spiral corrugated cylinder for an evaporator of the hydrogen generator of the second invention has a spiral corrugated side wall in the axial direction, A second concave portion deformed so as to protrude in the circumferential direction is provided.

  By using this spiral corrugated tube, it is possible to provide an evaporator in which shortcuts are unlikely to occur in the spiral flow path and are not easily broken.

  In order to solve the above-described conventional problem, the hydrogen generator of the third invention is processed so that the outer cylinder and the side wall form spiral irregularities in the axial direction. A spiral corrugated tube that is in close contact with the inner peripheral surface of the outer tube and forms a spiral flow path for evaporating water between the outer tube and a heating unit is provided on the inner peripheral side of the spiral corrugated tube A hydrogen generator for generating hydrogen from a raw material gas and water by a reforming reaction, comprising a second convex portion deformed so as to protrude in the outer peripheral direction at the apex portion of the convex portion, and an outer spiral corrugated tube At least a part of the second convex portion is crushed when brought into close contact with the inner peripheral surface of the cylinder.

  Thereby, in the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed, and thus the breakdown is not easily generated. In addition, it is possible to provide a hydrogen generator that can increase the heat exchange efficiency between the spiral flow path and the heating unit disposed on the inner periphery thereof.

  In order to solve the above-described conventional problems, the hydrogen generator of the fourth invention is processed so that the inner cylinder and the side wall form spiral irregularities in the axial direction. A spiral corrugated cylinder that is in close contact with the outer peripheral surface of the cylinder and forms a spiral flow path for evaporating water between the inner cylinder and a heating unit provided on the inner circumference side of the inner cylinder, Generation device for generating hydrogen by reforming reaction from water and water, comprising a second concave portion deformed so as to protrude in the inner circumferential direction at the apex portion of the concave portion, and forming the spiral corrugated cylinder on the outer peripheral surface of the inner cylinder It is characterized in that at least a part of the second recess is crushed when it is brought into close contact with.

  Accordingly, it is possible to provide a hydrogen generator that is unlikely to cause a shortcut in the spiral flow path due to the high surface pressure of the close contact portion in the evaporator, and is less likely to break due to the stress being dispersed.

In addition, in order to solve the above-described conventional problems, the method for manufacturing a hydrogen generator according to the fifth aspect of the present invention is processed so that the outer cylinder and the side wall form spiral irregularities in the axial direction. A spiral corrugated cylinder that forms a spiral flow path for causing water to evaporate between the outer cylinder and the convex portion in close contact with the inner circumferential surface of the outer cylinder, and a heating unit on the inner circumferential side of the spiral corrugated cylinder And a method of manufacturing a hydrogen generator that generates hydrogen from a raw material gas and water by a reforming reaction, and deforms the side wall of the cylindrical body to form a spiral unevenness in the axial direction and A tube forming step in which a second convex portion deformed so as to protrude in the outer peripheral direction is provided at the apex portion of the portion, and the spiral corrugated tube obtained in the tube forming step is brought into close contact with the inner peripheral surface of the outer tube, An adhesion step of crushing at least a part of the two convex portions.

  As a result, the hydrogen generator can be easily manufactured. In the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed to cause a breakdown. Hateful. Moreover, the manufacturing method of the hydrogen generator which can make high the heat exchange efficiency of a helical flow path and the heating part arrange | positioned in the inner periphery can be provided.

  In order to solve the above-described conventional problems, the method for manufacturing a hydrogen generator according to the sixth aspect of the invention is processed so that the inner cylinder and the side wall form spiral irregularities in the axial direction. A spiral corrugated cylinder that forms a spiral flow path that causes water to evaporate between the inner cylinder and a concave portion that is in close contact with the outer circumferential surface of the inner cylinder, and a heating unit is provided on the inner circumference side of the inner cylinder A method of manufacturing a hydrogen generator that generates hydrogen from a raw material gas and water by a reforming reaction, wherein the side wall of the cylinder is deformed to form spiral irregularities in the axial direction and the apex portion of the depressions A cylinder forming step for providing a second recess deformed so as to protrude in the inner peripheral direction, and a spiral corrugated tube obtained in the cylinder generating step is brought into close contact with the outer peripheral surface of the inner cylinder so that at least one of the second recesses is provided. And an adhesion process for crushing the part.

  As a result, the hydrogen generator can be easily manufactured. In the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed to cause a breakdown. It is possible to provide a method for manufacturing a difficult hydrogen generator.

  According to the spiral corrugated cylinder of the present invention, a hydrogen generator including the same, and a manufacturing method thereof, an evaporator that maintains a high surface pressure in a close contact portion of the flow path of the evaporator, is less likely to cause a shortcut, and is less likely to break And a hydrogen generator can be provided.

  Further, in an evaporator using a spiral corrugated cylinder that forms a spiral flow path for evaporating water between the concave and convex portions closely contacting the inner peripheral surface of the outer cylinder, the spiral flow When the heating unit is disposed on the inner periphery of the path, the heat exchange efficiency between the spiral channel and the heating unit can be increased.

The longitudinal cross-sectional view which shows the structure of the spiral waveform cylinder which concerns on Embodiment 1 of this invention Schematic configuration diagram of a hydrogen generator according to Embodiment 2 of the present invention Process drawing which shows the assembly by shrink fitting of the evaporator which concerns on Embodiment 3 of this invention Process drawing which shows the assembly by the cold fitting of the evaporator which concerns on Embodiment 4 of this invention Process drawing which shows the assembly by diameter expansion of the evaporator which concerns on Embodiment 5 of this invention Process drawing which shows the assembly by the diameter reduction of the evaporator which concerns on Embodiment 6 of this invention Process drawing which shows the assembly by press injection of the evaporator which concerns on Embodiment 7 of this invention A longitudinal sectional view showing a configuration of a spiral corrugated cylinder according to an eighth embodiment of the present invention. Schematic configuration diagram of a hydrogen generator according to Embodiment 9 of the present invention Longitudinal sectional view showing the main configuration of a conventional evaporator Longitudinal sectional view showing the main configuration of a modification of the conventional evaporator

  1st invention is processed so that a side wall may form a spiral unevenness | corrugation toward an axial direction, an uneven | corrugated convex part is closely_contact | adhered to the inner peripheral surface of an outer cylinder, and water is evaporated between outer cylinders A spiral corrugated tube that forms a spiral flow path, and includes a second convex portion that is deformed so as to protrude in an outer peripheral direction at the apex portion of the convex portion, and the spiral corrugated tube is an inner peripheral surface of the outer cylinder A spiral corrugated tube for an evaporator of a hydrogen generator, wherein at least a part of the second convex portion is crushed when brought into close contact with.

  In the evaporator using the spiral corrugated tube, the surface pressure of the close contact portion is high, so that the shortcut is not easily generated in the spiral flow path, and the stress is dispersed and the breakdown is not easily generated. Moreover, when a heating part is arrange | positioned at the inner periphery of a helical flow path, the heat exchange efficiency of a helical flow path and a heating part can be made high.

  2nd invention is processed so that a side wall may form a spiral unevenness in the direction of an axis, and a spiral which makes a concave and convex part stick to the outer peripheral surface of an inner cylinder, and evaporates water between it and an inner cylinder A spiral corrugated tube that forms a channel and has a second recess deformed so as to protrude in the inner circumferential direction at the apex of the recess, and the spiral corrugated tube is brought into close contact with the outer peripheral surface of the inner tube A helical corrugated tube for an evaporator of a hydrogen generator, characterized in that at least part of the second recess is sometimes crushed.

  In the evaporator using the spiral corrugated tube, the surface pressure of the close contact portion is high, so that the shortcut is not easily generated in the spiral flow path, and the stress is dispersed and the breakdown is not easily generated.

  According to a third aspect of the present invention, the outer cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, and the irregularities are brought into close contact with the inner peripheral surface of the outer cylinder so as to be between the outer cylinder and the outer cylinder. A spiral corrugated tube that forms a spiral flow path for evaporating water, and a heating unit is provided on the inner peripheral side of the spiral corrugated tube to generate hydrogen from the source gas and water by a reforming reaction The device includes a second convex portion that is deformed so as to protrude in the outer peripheral direction at the apex portion of the convex portion, and when the spiral corrugated tube is brought into close contact with the inner peripheral surface of the outer cylinder, the second convex portion At least a part of the hydrogen generator is crushed.

  Thereby, in the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed, and thus the breakdown is not easily generated. In addition, the heat exchange efficiency between the spiral flow path and the heating unit disposed on the inner periphery thereof can be increased.

  According to a fourth aspect of the present invention, the inner cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, the concave and convex depressions are brought into close contact with the outer peripheral surface of the inner cylinder, and water is provided between the inner cylinder and the inner cylinder. And a helical corrugated cylinder that forms a spiral flow path for evaporating a gas, and a heating unit is provided on the inner peripheral side of the inner cylinder, and generates hydrogen from a raw material gas and water by a reforming reaction. The second concave portion deformed so as to protrude in the inner peripheral direction is provided at the apex portion of the concave portion, and at least a part of the second concave portion is crushed when the spiral corrugated tube is brought into close contact with the outer peripheral surface of the inner cylinder. This is a hydrogen generator.

  Thereby, in the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed, and thus the breakdown is not easily generated.

  According to a fifth aspect of the present invention, the outer cylinder and the side wall are processed so as to form spiral irregularities in the axial direction. A spiral corrugated tube that forms a spiral flow path for evaporating water, and a heating unit is provided on the inner peripheral side of the spiral corrugated tube to generate hydrogen from the source gas and water by a reforming reaction A method of manufacturing an apparatus, wherein the side wall of the cylindrical body is deformed to form a spiral concavo-convex shape in the axial direction, and the second protrusion is deformed so as to protrude in the outer peripheral direction at the apex portion of the protrusion. A hydrogen generation apparatus comprising: a cylinder creating step for providing a portion; and an adhesion process in which the spiral corrugated cylinder obtained in the cylinder creating step is brought into close contact with the inner peripheral surface of the outer cylinder to crush at least a part of the second convex portion It is a manufacturing method.

  As a result, the hydrogen generator can be easily manufactured. In the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed to cause a breakdown. Hateful. In addition, the heat exchange efficiency between the spiral flow path and the heating unit disposed on the inner periphery thereof can be increased.

According to a sixth aspect of the present invention, the inner cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, the concave and convex depressions are brought into close contact with the outer peripheral surface of the inner cylinder, and water is provided between the inner cylinder and the inner cylinder. A helical corrugated cylinder that forms a spiral flow path that evaporates water, a heating unit is provided on the inner peripheral side of the inner cylinder, and a hydrogen generator that generates hydrogen from a raw material gas and water by a reforming reaction is manufactured. A cylinder in which a side wall of a cylindrical body is deformed to form a spiral concavo-convex shape in an axial direction and a second concave portion is formed at the apex portion of the concave portion so as to protrude in an inner circumferential direction. It is a manufacturing method of the hydrogen generator which has a creation process and a contact process which crushes at least a part of the 2nd crevice, making the spiral corrugated cylinder obtained at the cylinder creation process stick to the outer peripheral surface of an inner cylinder.

  As a result, the hydrogen generator can be easily manufactured. In the evaporator, the surface pressure of the close contact portion is high, so that a shortcut is not easily generated in the spiral flow path, and the stress is dispersed to cause a breakdown. Hateful.

  The seventh aspect of the invention is particularly located outside the two cylinders arranged coaxially when the two cylinders are brought into close contact with each other in the contact step in the method for producing a hydrogen generator of the fifth or sixth aspect of the invention. The tube is shrink-fitted.

  As a result, since the heat shrinks as a whole, it is possible to easily manufacture a hydrogen generator that is in close contact uniformly over the entire contact portion.

  In the eighth aspect of the invention, in particular, in the method for manufacturing the hydrogen generator of the fifth or sixth aspect, when the two cylinders are brought into close contact with each other in the contact step, they are located on the inner side of the two cylinders arranged coaxially. The tube is cooled and fitted.

  As a result, since the thermal expansion occurs as a whole, it is possible to easily manufacture the hydrogen generator without causing thermal deterioration due to uniform contact over the entire contact portion.

  In the ninth aspect of the invention, in particular, in the method of manufacturing the hydrogen generator of the fifth or sixth aspect, when the two cylinders are brought into close contact with each other in the contact step, they are located on the inner side of the two cylinders arranged coaxially. Internal pressure is applied to the inside of the tube.

  As a result, it is possible to efficiently perform contact processing in a short time, and to easily manufacture a hydrogen generator.

  In a tenth aspect of the invention, in particular, in the method for manufacturing a hydrogen generator according to the fifth or sixth aspect, when two cylinders are brought into close contact with each other in the contact step, they are located outside of the two cylinders arranged coaxially. External pressure is applied from the outside of the tube.

  Thereby, even if it is long in the axial direction, it is possible to efficiently perform contact processing in a short time, and it is possible to easily manufacture a hydrogen generator.

  In the eleventh aspect of the invention, in particular, in the method of manufacturing the hydrogen generator of the fifth or sixth aspect, when two cylinders are brought into close contact in the contact step, the inner cylinder is press-fitted into the outer cylinder.

  As a result, a hydrogen generator can be easily manufactured without using a special apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view showing a configuration of a spiral corrugated tube 1 according to Embodiment 1 of the present invention.

  The spiral corrugated tube 1 has spiral irregularities formed in the axial direction on a cylindrical side wall. The part protruding to the outer periphery is the convex part 2, the both sides are sandwiched by the convex part 2, and the part protruding to the inner peripheral side is the concave part 3. The convex part 2 has an outward R shape. The 2nd convex part 4 is formed by providing a level | step difference in the vertex part of this R shape.

  Since the helical corrugated tube 1 is required to have thermal conductivity and high temperature durability, it is made of, for example, a stainless steel thin plate. First, a thin stainless steel plate is rolled, the joint is welded, and a cylindrical part is manufactured. Thereafter, spiral irregularities are formed by bulging or spinning.

  The convex part 2 and the 2nd convex part 4 can be formed simultaneously by one process. Moreover, you may form the 2nd convex part 4 in what formed the convex part 2 previously. Although the number of steps increases by performing the processing twice, the dimensional accuracy of the second convex portion 4 can be increased.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram of the hydrogen generator 20 according to Embodiment 2 of the present invention.

  The hydrogen generator 20 is configured by a plurality of cylindrical partition walls arranged concentrically and forming flow paths and spaces by multiple cylinders.

  A heating unit 13 is disposed at the center of the multiple cylinder. The heating unit 13 includes a burner 14 and a heating channel 15. Fuel gas 55 and air 56 are supplied to the burner 14 to generate high-temperature combustion exhaust gas 57. As the fuel gas 55, a source gas such as city gas or LP gas, an off-gas containing hydrogen returned from the power generation stack, or the like is appropriately used.

  The generated flue gas 57 is folded back at the lower end, and after heat exchange is performed in the heating flow path 15, it is discharged out of the hydrogen generator 20. As the heating unit 13, a heating element other than the burner, for example, a heater or the like may be used.

  The evaporator 10 and the reforming unit 21 are arranged so as to surround the outer periphery of the heating unit 13. The evaporator 10 includes a spiral corrugated tube 1 and an outer tube 11 covering the outer periphery thereof. A space formed between the spiral irregularities of the spiral corrugated tube 1 and the outer tube 11 is a flow path 10a. The channel 10a is a single long channel along the spiral irregularities.

  The raw material gas 51 and the reformed water 52 flow through the flow path 10a, and the reformed water 52 is evaporated by heat exchange with the heating unit 13 disposed on the inner peripheral side of the spiral corrugated tube 1 to generate water vapor 52a.

  Since the flow path is long, heat can be exchanged over time, and since the spiral corrugated tube 1 faces the inner peripheral surface, the heat exchange area with the heating unit 13 is wide, which is high. Evaporation performance can be obtained. In particular, when the reforming water 52 is made to flow from the top to the bottom in the direction of gravity, the flow path 10a is spiral, so that the gradient of the flow path becomes gentle and the flow rate of the reforming water 52 becomes slow, which is more reliable. Can be evaporated.

  The spiral corrugated tube 1 and the outer tube 11 are in close contact with each other at the contact portion 12. The close contact portion 12 is formed by the second convex portion 4 of FIG. 1 being crushed by the inner peripheral surface of the outer cylinder 11. By doing so, the deformation of the spiral corrugated tube 1 is concentrated in the vicinity of the close contact portion 12, and the surface pressure of the close contact portion 12 can be increased. Further, the stress applied to the portions other than the close contact portion 12 of the spiral corrugated tube 1 is distributed over the entire convex portion 2 because the convex portion 2 of FIG.

When the high pressure gas flows into the flow path 10a due to the high surface pressure of the close contact portion 12, for example, a large amount of the raw material gas 51 and the reforming water 52 are flown, and the reforming water 52 becomes the water vapor 52a. Can further be prevented from collapsing when the contact portion 12 is further increased.

  Further, when the hydrogen generator 20 using the evaporator 10 is started or stopped, when the outer cylinder 11 becomes hotter than the spiral corrugated cylinder 1 and the temperature difference temporarily increases, There is a possibility that the surface pressure of the close contact portion 12 may decrease.

  Also in this case, by applying a high surface pressure in advance, it is possible to follow the deformation due to thermal expansion and make it difficult for the close contact portion 12 to collapse. As a result, it is possible to provide the evaporator 10 in which the close contact of the close contact portion 12 is always maintained, and the shortcut of the reforming water 52 hardly occurs.

  In addition, since the stress of the spiral corrugated tube 1 is distributed over the entire convex portion 2, an evaporator 10 is provided in which the spiral corrugated tube 1 is less likely to be destroyed even after a long period of operation and repeated start and stop. can do.

  The gas in which the water vapor 52 a generated in the evaporator 10 and the source gas 51 are mixed flows into the reforming unit 21. In the reforming unit 21, a reforming catalyst is filled in an annular space. As the reforming catalyst, catalyst particles in which platinum, rhodium, ruthenium, nickel or the like is supported on an alumina carrier are used.

  Due to the action of the reforming catalyst, a hydrogen-rich hydrogen-containing gas 53 is generated from the raw material gas 51 and the steam 52a by a steam reforming reaction. This steam reforming reaction is an endothermic reaction, and the reaction is promoted by the heat exchange between the reforming unit 21 and the combustion exhaust gas 57. The hydrogen-containing gas 53 contains CO (carbon monoxide).

  The hydrogen-containing gas 53 exiting the reforming unit 21 flows into the shift unit 22. The shift section 22 is filled with, for example, a copper shift catalyst. In the shift part 22, the CO concentration is reduced (for example, reduced to 0.5% or less) by the shift reaction.

  The hydrogen-containing gas 53 that has exited the shift unit 22 flows into the CO removal unit 23. At this time, air 56 is mixed with the hydrogen-containing gas 53. The CO removal unit 23 is filled with, for example, a ruthenium-based CO removal catalyst. In the CO removing unit 23, CO and oxygen in the air react by selective oxidation reaction, and CO is almost completely removed (for example, the concentration of CO is 10 ppm or less).

  By such a reaction, the hydrogen-containing gas 53 becomes a reformed gas 54 that hardly contains CO, and is discharged from the hydrogen generator 20. Thereafter, the reformed gas 54 is sent to the power generation stack and used for power generation.

  In addition, you may arrange | position the transformation part 22 and the CO removal part 23 adjacently so that the outer periphery of the evaporator 10 may be covered. Since the reaction of the shift unit 22 and the CO removal unit 23 is an exothermic reaction, the heat exchange with the evaporator 10 promotes the evaporation of the reforming water 52 and cools the shift unit 22 and the CO removal unit 23. It is possible to improve the efficiency of the hydrogen generator 20.

  Thus, the hydrogen generator 20 of the present invention can exhibit high reforming performance when the evaporator 10 efficiently exchanges heat.

If the flow path 10a of the evaporator 10 is short-circuited, the reformed water 52 that has not been completely evaporated flows into the reforming unit 21, wets the reforming catalyst, and the reforming catalyst deteriorates and becomes hydrogen. There is a possibility that the performance of the generation device 20 may be reduced. However, the hydrogen generator 20 of the present invention has a structure in which the flow path 10a is less likely to occur in the evaporator 10 and can maintain high reforming performance.

  Further, the hydrogen generator 20 is repeatedly activated and stopped once a day, for example. At this time, the temperature of the hydrogen generator 20 is rapidly raised from substantially normal temperature to, for example, 600 ° C. or higher. On the other hand, when the operation is stopped, it is rapidly cooled.

  Even by such repeated thermal contraction, the hydrogen generator 20 of the present invention is less likely to break due to stress being dispersed in the evaporator 10.

  Hereinafter, as the third to seventh embodiments, different examples of the adhesion process for forming the adhesion part 12 of the evaporator 10 will be described with reference to process diagrams.

(Embodiment 3)
FIG. 3 is a process diagram illustrating assembly by shrink fitting of the evaporator 10 according to Embodiment 3 of the present invention.

For the spiral corrugated cylinder 1 and the outer cylinder 11 constituting the evaporator 10, when the outer diameter of the spiral corrugated cylinder 1 is D1 and the inner diameter of the outer cylinder 11 is D2,
D1> D2
Make it as follows.

The outer cylinder 11 is heated using the heating device 61, and by thermal expansion,
D1 <D2
To be.

  Next, the spiral corrugated tube 1 is inserted into the inner peripheral side of the outer tube 11. Thereafter, when the temperature of the outer cylinder 11 approaches normal temperature, the outer cylinder 11 is brought into close contact with the spiral corrugated cylinder 1 by thermal contraction, whereby the evaporator 10 can be manufactured.

  As described above, the inner diameter D2 of the outer cylinder 11 smaller than the outer diameter D1 of the spiral corrugated cylinder 1 is larger than the outer diameter D1 of the spiral corrugated cylinder 1 when the temperature is raised using the heating device 61 at room temperature. Moreover, since the outer cylinder 11 is thermally contracted as a whole by using the shrink-fitting after the spiral corrugated cylinder 1 and the outer cylinder 11 are manufactured, it is possible to uniformly adhere to the entire contact portion. Thereby, a hydrogen generator can be easily manufactured.

(Embodiment 4)
FIG. 4 is a process diagram showing assembly by evaporator fitting of the evaporator 10 according to Embodiment 4 of the present invention.

As in the third embodiment described above, when the outer diameter of the spiral corrugated tube 1 is D1 and the inner diameter of the outer tube 11 is D2,
D1> D2
Make it as follows.

The spiral corrugated tube 1 is cooled using the cooling device 62, and by heat shrinkage,
D1 <D2
To be.

Next, the spiral corrugated tube 1 is inserted into the inner peripheral side of the outer tube 11. Thereafter, when the temperature of the spiral corrugated tube 1 approaches normal temperature, the spiral corrugated tube 1 is brought into close contact with the outer tube 11 by thermal expansion, whereby the evaporator 10 can be manufactured.

  Thus, when the outer diameter D1 of the spiral corrugated cylinder 1 larger than the inner diameter D2 of the outer cylinder 11 is cooled using the cooling device 62 at room temperature, the spiral is set to be smaller than the inner diameter D2 of the outer cylinder 11. Since the corrugated tube 1 and the outer tube 11 are manufactured, and the cold corrugated tube 1 is used, the spiral corrugated tube 1 is thermally expanded as a whole, so that it can be uniformly adhered.

  Thereby, a hydrogen generator can be easily manufactured. In addition, since the cold fitting has a smaller amount of temperature change than the shrink fitting, it is necessary to manufacture a more accurate part in the cylinder forming process. On the other hand, since it does not cause thermal degradation due to high temperature, it can be carried out even with a material having low heat resistance.

(Embodiment 5)
FIG. 5 is a process diagram showing the assembly of the evaporator 10 according to the fifth embodiment of the present invention by expanding the diameter.

When the outer diameter of the spiral corrugated tube 1 is D1 and the inner diameter of the outer tube 11 is D2,
D1 <D2
The spiral corrugated tube 1 and the outer tube 11 are manufactured in advance.

  First, the spiral corrugated tube 1 is inserted inside the outer tube 11. A diameter expansion jig 63 is installed further inside the spiral corrugated tube 1. The diameter expansion jig 63 spreads in the diameter expansion direction, applies internal pressure to the spiral corrugated cylinder 1 and expands the diameter, thereby closely contacting the outer cylinder 11 and manufacturing the evaporator 10.

  As the diameter expansion jig 63, a tool that is uniformly extended in the entire circumferential direction by pushing a taper pin into a plurality of molds divided in the circumferential direction is used. Moreover, you may overhang by compressing an elastic body, such as urethane rubber, to an axial direction.

  As described above, the spiral corrugated cylinder 1 manufactured with the outer diameter D1 smaller than the inner diameter D2 of the outer cylinder 11 is enlarged so as to be in close contact with the outer cylinder 11, so that the close-contact processing can be efficiently performed in a short time. It can be carried out. Thereby, a hydrogen generator can be easily manufactured.

(Embodiment 6)
FIG. 6 is a process diagram showing the assembly of the evaporator according to the sixth embodiment of the present invention with a reduced diameter.

As in the fifth embodiment described above, when the outer diameter of the spiral corrugated tube 1 is D1 and the inner diameter of the outer tube 11 is D2,
D1 <D2
The spiral corrugated tube 1 and the outer tube 11 are manufactured in advance.

  First, the spiral corrugated tube 1 is inserted inside the outer tube 11. A diameter-reducing jig 64 is installed on the outer side of the outer cylinder 11. The diameter-reducing jig 64 moves in the diameter-reducing direction, applies an external pressure to the outer cylinder 11 and reduces the diameter, thereby closely contacting the spiral corrugated cylinder 1, and the evaporator 10 can be manufactured.

  As the diameter-reducing jig 64, there is used a tool in which a plurality of molds divided in the circumferential direction are uniformly pushed in a circumferential direction using a taper block. A method of sequentially reducing the diameter by spinning or the like without using a mold may be used.

  As described above, the outer cylinder 11 manufactured with the inner diameter D2 larger than the outer diameter D1 of the spiral corrugated cylinder 1 is reduced in diameter so as to be in close contact with the spiral corrugated cylinder 1, thereby efficiently and in close contact processing. It can be performed. Thereby, a hydrogen generator can be easily manufactured.

  Compared with the diameter expansion, when the diameter is reduced, the diameter-reducing jig 64 is relatively large, so that the equipment cost is increased. On the other hand, since it is not necessary to insert a jig inside, even if it is long in the axial direction, it is possible to perform contact processing in a short time.

  Since the spiral corrugated tube 1 is used on the inner peripheral side, it is preferable to use the reduced diameter of the sixth embodiment rather than the expanded diameter of the fifth embodiment because the diameter reducing jig 64 has a simple shape.

(Embodiment 7)
FIG. 7 is a process diagram showing assembly by press-fitting an evaporator according to Embodiment 7 of the present invention.

When the outer diameter of the spiral corrugated tube 1 is D1 and the inner diameter of the outer tube 11 is D2,
D1> D2
The spiral corrugated tube 1 and the outer tube 11 are manufactured in advance.

  The evaporator 10 can be manufactured by arranging the outer cylinder 11 and the spiral corrugated cylinder 1 on the same axis, pressing the spiral corrugated cylinder 1 into the outer cylinder 11 with a press machine or the like, and press-fitting it.

  At this time, if the press-fitting resistance is strong, the spiral corrugated tube 1 and the outer tube 11 are buckled, and assembly becomes difficult. Since the spiral corrugated cylinder 1 according to the seventh embodiment of the present invention increases the surface pressure by limiting the portion to be crushed at the time of close contact, the press-fitting resistance can be kept relatively low.

  By using press-fitting, close contact processing can be performed without using special equipment or a dedicated jig. Thereby, a hydrogen generator can be manufactured simply.

(Embodiment 8)
FIG. 8 is a longitudinal sectional view showing the configuration of the spiral corrugated cylinder 31 according to the eighth embodiment of the present invention.

  The spiral corrugated tube 31 is formed with spiral irregularities on the cylindrical side wall in the axial direction. A portion protruding to the outer periphery is a convex portion 32, both sides are sandwiched by the convex portion 32, and a portion protruding to the inner peripheral side is a concave portion 33. The recess 33 has an inward R shape. A second recess 34 is formed by providing a step at the apex portion of the R shape.

  The manufacturing method of the spiral corrugated cylinder 31 is the same as that in the first embodiment.

(Embodiment 9)
FIG. 9 is a schematic configuration diagram of a hydrogen generator 50 according to Embodiment 9 of the present invention. By using the same reference numerals as those used in the description of the second embodiment described above in this embodiment, redundant description is omitted.

  The hydrogen generator 50 is configured by a plurality of cylindrical partition walls arranged concentrically and forming a flow path and a space by multiple cylinders.

  A heating unit 13 is disposed at the center of the multiple cylinder. The heating unit 13 includes a burner 14 and a heating channel 15. The combustion exhaust gas 57 generated by the burner 14 is discharged from the hydrogen generator 50 through the heating flow path 15. As the heating unit 13, a heating element other than the burner, for example, a heater or the like may be used.

  The evaporator 40 and the reforming unit 21 are arranged so as to surround the outer periphery of the heating unit 13. The evaporator 40 includes a spiral corrugated cylinder 31 and an inner cylinder 41 covered by the inner periphery thereof.

  A space formed between the spiral irregularities of the spiral corrugated cylinder 31 and the inner cylinder 41 is a flow path 40a. The channel 10a is a single long channel along the spiral irregularities. The function and effect of the channel 40a are the same as those of the channel 10a of the second embodiment.

  The spiral corrugated cylinder 31 and the inner cylinder 41 are in close contact with each other at the close contact portion 42. The close contact portion 42 is formed by crushing the second concave portion 34 of FIG. 8 by the outer peripheral surface of the inner cylinder 41. By doing so, the deformation of the spiral corrugated tube 31 is concentrated in the vicinity of the close contact portion 42, and the surface pressure of the close contact portion 42 can be applied high. Further, the stress applied to the portions other than the close contact portion 42 of the spiral corrugated tube 31 is distributed over the entire recess portion 33 because the recess portion 33 of FIG.

  As described above, as in the case of the second embodiment, the surface pressure of the tight contact portion is high, so that a shortcut is not easily generated in the flow path 40a, and the stress of the spiral corrugated cylinder 31 is dispersed throughout the recess 33. It is possible to provide the evaporator 40 that is not easily broken.

  In the second embodiment, the efficiency as the hydrogen generator 20 can be improved by arranging the transformation unit 22 and the CO removal unit 23 so as to cover the outer periphery of the evaporator 10, but also in this embodiment. Similarly, the efficiency as the hydrogen generator 50 can be improved by disposing the transformation unit 22 and the CO removal unit 23 so as to cover the outer periphery of the evaporator 40.

  In particular, since the spiral corrugated tube 31 faces the outer peripheral surface, the heat exchange area is increased, and the metamorphic portion 22 and the CO removal portion 23 can be efficiently cooled.

  Moreover, about the manufacturing method, each manufacturing method of Embodiment 3-7 is applicable similarly. By using these manufacturing methods, a hydrogen generator can be easily manufactured.

  However, in the evaporator 40 of the present embodiment, it is preferable to use the diameter expansion of the fifth embodiment rather than the diameter reduction of the sixth embodiment because the diameter expansion jig 63 has a simple shape.

  The hydrogen generator of the present invention has an evaporator that is less likely to cause shortcuts due to high surface pressure at the close contact portion of the flow path, and that is less likely to break due to stress dispersion. It is used for the production of fuel gas.

DESCRIPTION OF SYMBOLS 1 Spiral corrugated cylinder 2 Convex part 3 Concave part 4 2nd convex part 10 Evaporator 10a Flow path 11 Outer cylinder 12 Contact | adherence part 13 Heating part 20 Hydrogen generator 21 Reforming part 22 Metamorphic part 23 CO removal part 31 Spiral corrugated cylinder 32 Convex Part 33 Concave part 34 Second concave part 40 Evaporator 40a Flow path 41 Inner cylinder 42 Adhering part 50 Hydrogen generator 61 Heating apparatus 62 Cooling apparatus 63 Diameter expansion jig 64 Diameter reduction jig

Claims (11)

A side wall is processed so as to form a spiral concavo-convex shape in the axial direction, the convex portion of the concavo-convex portion is brought into close contact with the inner peripheral surface of the outer cylinder, and a spiral shape that evaporates water between the outer cylinder A spiral corrugated tube forming a flow path,
The apex portion of the convex portion includes a second convex portion that is deformed so as to protrude in the outer peripheral direction,
A spiral corrugated tube for an evaporator of a hydrogen generator, wherein at least a part of the second convex portion is crushed when the spiral corrugated tube is brought into close contact with an inner peripheral surface of the outer tube. A spiral flow path that is processed so as to form spiral irregularities in the axial direction, and that the concave and convex portions are in close contact with the outer peripheral surface of the inner cylinder to evaporate water between the inner cylinder and the inner cylinder. A spiral corrugated tube forming
The top part of the concave part is provided with a second concave part that is deformed so as to protrude in the inner circumferential direction,
The spiral corrugated cylinder for an evaporator of a hydrogen generator, wherein at least a part of the second recess is crushed when the spiral corrugated cylinder is brought into close contact with the outer peripheral surface of the inner cylinder. The outer cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, and the convex portions of the irregularities are brought into close contact with the inner peripheral surface of the outer cylinder, so that water is provided between the outer cylinder and the outer cylinder. A spiral corrugated tube forming a spiral flow path to evaporate,
A heating unit is provided on the inner peripheral side of the spiral corrugated cylinder, and generates hydrogen by a reforming reaction from a raw material gas and the water,
The apex portion of the convex portion includes a second convex portion that is deformed so as to protrude in the outer peripheral direction,
When the spiral corrugated cylinder is brought into close contact with the inner peripheral surface of the outer cylinder, at least a part of the second convex portion is crushed. The inner cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, and the concave and convex portions are brought into close contact with the outer peripheral surface of the inner cylinder to evaporate water between the inner cylinder and the inner cylinder. A spiral corrugated tube forming a spiral channel,
A heating unit is provided on the inner peripheral side of the inner cylinder, and generates hydrogen from a raw material gas and the water by a reforming reaction,
The top part of the concave part is provided with a second concave part that is deformed so as to protrude in the inner circumferential direction,
The hydrogen generator according to claim 1, wherein when the spiral corrugated tube is brought into close contact with the outer peripheral surface of the inner tube, at least a part of the second recess is crushed. The outer cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, and the convex portions of the irregularities are brought into close contact with the inner peripheral surface of the outer cylinder, so that water is provided between the outer cylinder and the outer cylinder. A spiral corrugated tube forming a spiral flow path to evaporate,
A heating unit is provided on the inner peripheral side of the spiral corrugated cylinder, and a method for producing a hydrogen generating apparatus that generates hydrogen from a raw material gas and the water by a reforming reaction,
A cylinder creating step of deforming a side wall of the cylinder to form a spiral irregularity in the axial direction and providing a second convex part deformed so as to protrude in the outer peripheral direction at the apex part of the convex part; ,
An adhesion step in which the spiral corrugated tube obtained in the tube creation step is brought into close contact with an inner peripheral surface of the outer tube, and at least a part of the second convex portion is crushed;
A method for manufacturing a hydrogen generator having The inner cylinder and the side wall are processed so as to form spiral irregularities in the axial direction, and the concave and convex portions are brought into close contact with the outer peripheral surface of the inner cylinder to evaporate water between the inner cylinder and the inner cylinder. A spiral corrugated tube forming a spiral channel,
A heating unit is provided on the inner peripheral side of the inner cylinder, and a method for producing a hydrogen generator that generates hydrogen from a raw material gas and the water by a reforming reaction,
A cylinder creating step of deforming the side wall of the cylindrical body to form a spiral concavo-convex shape in the axial direction and providing a second concave portion that is deformed so as to protrude in the inner circumferential direction at the apex portion of the concave portion,
An adhesion process in which the spiral corrugated cylinder obtained in the cylinder creation process is brought into close contact with an outer peripheral surface of the inner cylinder, and at least a part of the second recess is crushed;
A method for manufacturing a hydrogen generator having When two cylinders are brought into close contact with each other in the contact step, a cylinder located outside of the two cylinders arranged coaxially is shrink-fitted,
The manufacturing method of the hydrogen generator of Claim 5 or 6. When two cylinders are brought into close contact with each other in the contact step, a cylinder located on the inner side of the two cylinders arranged coaxially is fitted by cooling.
The manufacturing method of the hydrogen generator of Claim 5 or 6. When two cylinders are brought into close contact with each other in the contact step, an internal pressure is applied to the inside of the cylinder located inside among the two cylinders arranged coaxially.
The manufacturing method of the hydrogen generator of Claim 5 or 6. When the two cylinders are brought into close contact with each other in the contact step, external pressure is applied from the outside of the cylinder located outside of the two cylinders arranged coaxially.
The manufacturing method of the hydrogen generator of Claim 5 or 6.   The method for manufacturing a hydrogen generator according to claim 5 or 6, wherein when the two cylinders are brought into close contact with each other in the contact step, the inner cylinder is press-fitted into the outer cylinder.

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