Hydrogen production device

Abstract

To achieve a reliable hydrogen production device.SOLUTION: A combustion exhaust gas flow channel 105 is for flowing combustion exhaust gas. A supply tube 120 has a supply port 120o. The supply port 120o is open to a water flow channel 130. The water flow channel 130 is for flowing water from the supply port 120o from top to bottom. The water flow channel 130 is configured to be along the combustion exhaust gas flow channel 105. The water flow channel 130 includes a vaporization part 111. The vaporization part 111 vaporizes the water to produce water vapor. A reforming part 112 is supplied with the water vapor. An inclination structure Si is inclined relative to a vertical direction AD. The vaporization part 111 extends along the inclination structure Si. An upper end Tt of the whole inclination structure Si is situated on a low level compared with a lower end B0 of the supply port 120o.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a hydrogen generation device. [Background technology]

[0002] For example, hydrogen generation devices have been studied as described in Patent Documents 1 and 2. In one example of a hydrogen generation device, water is heated by combustion exhaust gas. The heated water is supplied to a reforming section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-118143 [Patent Document 2] International Publication No. 2009 / 139159 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides techniques suitable for realizing a reliable hydrogen generation device. [Means for solving the problem]

[0005] The present disclosure provides: a combustion exhaust gas flow path through which the combustion exhaust gas flows; a supply pipe having a supply port; a water flow path that is open to the supply port, allows water from the supply port to flow from top to bottom, and is along the combustion exhaust gas flow path, and includes an evaporation section that evaporates the water to generate water vapor; a reforming section to which the steam is supplied; an inclined structure inclined with respect to the vertical direction, the evaporation portion extends along the inclined structure, The upper end of the entire inclined structure is located lower than the lower end of the supply port. A hydrogen generation device is provided. [Effects of the Invention]

[0006] The technology according to the present disclosure is suitable for realizing a reliable hydrogen generation device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing the configuration of the hydrogen generation device according to the first embodiment. [Figure 2] FIG. 2 is an enlarged perspective view of the vicinity of the supply port of the supply pipe in the water flow path of the first embodiment. [Figure 3] FIG. 3 is an enlarged cross-sectional view of the water flow path in the first embodiment, near the supply port of the supply pipe. [Figure 4] FIG. 4 is a schematic explanatory view of the water flow path in the first embodiment, near the supply port of the supply pipe. [Figure 5] FIG. 5 is an enlarged perspective view of the vicinity of the supply port of the supply pipe in the water flow path according to the second embodiment. [Figure 6] FIG. 6 is an enlarged perspective view of the vicinity of the supply port of the supply pipe in the water flow path according to the third embodiment. [Figure 7] FIG. 7 is an enlarged cross-sectional view of the vicinity of the supply port of the supply pipe in the water flow path according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (Findings that formed the basis of this disclosure) In one example of a hydrogen generator, heat exchange occurs between the flue gas and water to be supplied to the reforming section. The water is heated by the heat exchange. Meanwhile, the flue gas is cooled by the heat exchange. If the temperature of the flue gas drops excessively due to cooling, condensation occurs, and there is a risk that the pipes through which the flue gas passes will become clogged with water.

[0009] The temperature of water is lower upstream of the water flow path than downstream of the water flow path. According to the study by the inventors, the above risk can be reduced by reducing the area where heat exchange between the combustion exhaust gas and water occurs upstream of the water flow path to avoid excessive heat exchange. This can contribute to realizing a reliable hydrogen generation device.

[0010] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of already well-known matters or redundant description of substantially the same configuration may be omitted. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0012] [1-1.Configuration] 1 is a cross-sectional view showing the configuration of a hydrogen generator 100 in Embodiment 1. The hydrogen generator 100 includes a combustion tube 101, an inner tube 102, a partition wall 103, an outer tube 104, a heating section 110, an evaporation section 111, a reforming section 112, a CO reduction section 113, a combustion exhaust gas flow path 105, a primary hydrogen-containing gas flow path 141, a secondary hydrogen-containing gas flow path 142, a supply pipe 120, a combustion exhaust gas exhaust pipe 121, a hydrogen gas exhaust pipe 122, and a partition plate 123.

[0013] The combustion cylinder 101 has an axis O extending in the up-down direction AD. The up-down direction AD is specifically a vertical direction. In FIG. 1, the radial direction RD is a linear direction perpendicular to the up-down direction AD. The circumferential direction CD is a direction perpendicular to the up-down direction AD and circumferential around the axis O. The inner cylinder 102 surrounds the combustion cylinder 101. The partition wall 103 surrounds the inner cylinder 102. The outer cylinder 104 surrounds the partition wall 103. The combustion cylinder 101, the inner cylinder 102, the partition wall 103, and the outer cylinder 104 are coaxial. The combustion cylinder 101, the inner cylinder 102, the partition wall 103, and the outer cylinder 104 are plate-shaped bodies. The combustion cylinder 101, the inner cylinder 102, the partition wall 103, the outer cylinder 104, the supply pipe 120, the combustion exhaust gas exhaust pipe 121, the hydrogen gas exhaust pipe 122, and the partition plate 123 contain metal.

[0014] A heating section 110 is provided within the combustion tube 101. The heating section 110 extends along an axis O. The heating section 110 includes an intake port 110a, an air flow path 110b, a combustible gas flow path 110c, and a combustion section 110d. The combustion section 110d is located below the intake port 110a. The intake port 110a draws in air. The air flow path 110b flows air from the intake port 110a to the combustion section 110d from top to bottom. The combustible gas flow path 110c flows combustible gas from top to bottom to the combustion section 110d. In the combustion section 110d, the air and combustible gas are combusted, forming a downward flame and generating combustion exhaust gas. In the illustrated example, the heating section 110 is a burner. The combustion section 110d is an opening of the burner.

[0015] A combustion exhaust gas flow path 105 is provided between the inner cylinder 102 and the combustion cylinder 101. A combustion exhaust gas exhaust pipe 121 is connected to the upper part of the outer cylinder 104. The combustion exhaust gas generated in the combustion section 110d enters the combustion exhaust gas flow path 105 through a gap below the combustion cylinder 101 and flows through the combustion exhaust gas flow path 105 from bottom to top. Heat of the combustion exhaust gas in the combustion exhaust gas flow path 105 is imparted to the air in the air flow path 110b, the raw material gas and water in the evaporation section 111, and the raw material gas and water in the reforming section 112. After flowing through the combustion exhaust gas flow path 105, the combustion exhaust gas is discharged from the combustion exhaust gas exhaust pipe 121.

[0016] The inner cylinder 102 is cylindrical and has a bottom. The partition wall 103 includes an upper portion and a lower portion. The diameter of the lower portion is larger than the diameter of the upper portion. The partition wall 103 surrounds the inner cylinder 102.

[0017] A supply pipe 120 is connected to the inner cylinder 102 and the partition wall 103. A source gas containing hydrocarbon and water are supplied to the supply pipe 120. The source gas and water are supplied to the evaporation section 111.

[0018] An evaporation section 111 is provided between the inner cylinder 102 and the partition wall 103. Raw material gas and water are supplied to the evaporation section 111 from a supply pipe 120. The evaporation section 111 allows the raw material gas and water to flow from top to bottom. The water evaporates in the evaporation section 111. Note that flowing a fluid from top to bottom means that the outlet of the fluid is located below the inlet of the fluid. Flowing a fluid from bottom to top means that the outlet of the fluid is located above the inlet of the fluid. The same applies to other similar expressions, such as fluid flowing from top to bottom.

[0019] The inner cylinder 102 includes a spiral structure 161 and a lower structure 162. The spiral structure 161 and the lower structure 162 are surrounded by a partition wall 103. A spiral space is defined by the spiral structure 161 and the upper part of the partition wall 103. This spiral space is the evaporation section 111. The lower structure 162 is provided below the spiral structure 161.

[0020] It should be noted that the term "evaporation section 111" is not intended to exclude a form in which water evaporation occurs at a position other than the evaporation section 111. In this embodiment, water may evaporate at a position other than the evaporation section 111, or water may evaporate only in the evaporation section 111. Furthermore, water may evaporate in the entire evaporation section 111, or water may evaporate only in a part of the evaporation section 111.

[0021] In the first embodiment, the inner cylinder 102 is bent to surround the axis O, thereby forming a cylindrical shape. The inner cylinder 102 is also bent to have a convex structure that protrudes away from the axis O, that is, outward in the radial direction RD in the illustrated example. This convex structure is a spiral structure 161. The inner cylinder 102 and the partition wall 103 define a spiral space along the spiral structure 161, i.e., an evaporation section 111. The spiral structure 161 functions as a partition that divides the area inside the partition wall 103 into a spiral shape.

[0022] The reforming section 112 is provided between the lower portion of the partition wall 103 and the lower structure 162. A reforming catalyst is filled in the reforming section 112. The raw material gas and steam flowing out from the evaporation section 111 flow through the reforming section 112. The reforming catalyst generates a hydrogen-containing gas (hereinafter referred to as a primary hydrogen-containing gas) from the raw material gas and steam through a reforming reaction. The primary hydrogen-containing gas contains carbon monoxide and hydrogen.

[0023] The outer cylinder 104 has a cylindrical shape with a bottom and includes an upper portion, a lower portion, and a bottom.

[0024] The lower portion of the outer casing 104 surrounds the lower portion of the partition wall 103. Between the bottom of the outer casing 104 and the lower end of the partition wall 103, there is a gap through which the primary hydrogen-containing gas flows. A primary hydrogen-containing gas flow path 141 is provided between the lower portion of the outer casing 104 and the lower portion of the partition wall 103. The primary hydrogen-containing gas flow path 141 redirects the flow of the primary hydrogen-containing gas that has flowed downward from the reforming section 112 upward and guides it to the CO reduction section 113. In this embodiment, the primary hydrogen-containing gas flow path 141 may also be referred to as a return flow path.

[0025] The upper part of the outer casing 104 surrounds the upper part of the partition wall 103. A CO reduction section 113 is provided between the upper part of the outer casing 104 and the upper part of the partition wall 103. A hydrogen gas exhaust pipe 122 is connected to the outer casing 104 at a position above the CO reduction section 113.

[0026] The CO reduction section 113 is filled with a CO reduction catalyst. The primary hydrogen-containing gas flowing out from the reforming section 112 contains carbon monoxide. The CO reduction catalyst reduces the concentration of carbon monoxide through a modification reaction. This produces a hydrogen-containing gas with a reduced concentration of carbon monoxide (hereinafter referred to as a secondary hydrogen-containing gas).

[0027] A secondary hydrogen-containing gas flow path 142 is provided between the CO reduction section 113 and the hydrogen gas exhaust pipe 122. The secondary hydrogen-containing gas flow path 142 guides the secondary hydrogen-containing gas from the CO reduction section 113 to the hydrogen gas exhaust pipe 122. In this way, carbon monoxide and hydrogen with reduced concentrations from the CO reduction catalyst are discharged from the hydrogen gas exhaust pipe 122.

[0028] Hereinafter, the term water flow path 130 will be used. The raw material gas and water are supplied to the water flow path 130 from an opening 120o of the supply pipe 120. Hereinafter, the opening 120o may be referred to as a supply port 120o. The water flow path 130 guides the raw material gas and water to the reforming section 112. The evaporation section 111 is included in the water flow path 130.

[0029] Hereinafter, the term "hydrogen-containing gas flow passage 140" will be used. The hydrogen-containing gas discharged from the reforming unit 112 flows through the hydrogen-containing gas flow passage 140. The hydrogen-containing gas flow passage 140 includes a primary hydrogen-containing gas flow passage 141 and a secondary hydrogen-containing gas flow passage 142. The hydrogen-containing gas flow passage 140 is provided with a CO reduction unit 113.

[0030] The partition plate 123 separates the combustion exhaust gas flow path 105 from the hydrogen-containing gas flow path 140. Specifically, the partition plate 123 separates the combustion exhaust gas flow path 105 from the secondary hydrogen-containing gas flow path 142. The partition plate 123 is fixed to the partition wall 103 and the outer casing 104.

[0031] In this embodiment, the combustion exhaust gas passage 105 and the air passage 110b are arranged alongside each other via the combustion tube 101. This configuration is suitable for causing heat exchange between the combustion exhaust gas in the combustion exhaust gas passage 105 and the air in the air passage 110b. Furthermore, the combustion exhaust gas passage 105 and the water passage 130 are arranged alongside each other via the inner tube 102. This configuration is suitable for causing heat exchange between the combustion exhaust gas in the combustion exhaust gas passage 105 and the raw material gas and water in the evaporation section 111. These heat exchanges can recover heat from the combustion exhaust gas in the hydrogen generator 100 and contribute to efficient operation of the hydrogen generator 100.

[0032] As can be understood from the above description, in this embodiment, the hydrogen generator 100 includes a combustion exhaust gas flow path 105, a supply pipe 120, a water flow path 130, a reforming section 112, and a sloped structure Si. The combustion exhaust gas flow path 105 allows combustion exhaust gas to flow. The supply pipe 120 has a supply port 120o. The supply port 120o opens into the water flow path 130. In the illustrated example, the supply port 120o opens in a direction different from the up-down direction AD, specifically, opens inward in the radial direction RD. The water flow path 130 allows raw material gas and water from the supply port 120o to flow from top to bottom. The water flow path 130 is aligned with the combustion exhaust gas flow path 105. The water flow path 130 includes an evaporation section 111. The evaporation section 111 evaporates water to generate steam. Steam is supplied to the reforming section 112. The sloped structure Si is inclined with respect to the up-down direction AD. Specifically, the inclined structure Si is a spiral structure 161. The evaporation portion 111 extends along the inclined structure Si.

[0033] This embodiment will be further described below with reference to FIGS. 2 to 4. FIG. 2 is an enlarged perspective view of the water flow path 130 of the first embodiment, near the supply port 120o of the supply pipe 120. In FIG. 2, the partition wall 103 is partially omitted, thereby making the water flow path 130 visible, and the inner cylinder 102 and its spiral structure 161 are also visible. This also applies to FIGS. 5 and 6. FIG. 3 is an enlarged cross-sectional view of the water flow path 130 of the first embodiment, near the supply port 120o of the supply pipe 120. FIG. 3 shows the circumferential position X0. This also applies to FIG. 7. The circumferential position X0 will be described later. FIG. 4 is a schematic explanatory view of the water flow path 130 of the first embodiment, near the supply port 120o of the supply pipe 120.

[0034] In this embodiment, the upper end Tt of the entire gradient structure Si is located lower than the lower end B0 of the supply port 120o. This configuration makes it easy to avoid excessive heat exchange between the combustion exhaust gas and water in the region from when the water flows from the supply port 120o into the water flow path 130 until it hits the gradient structure Si. This reduces the risk of the combustion exhaust gas exhaust pipe 121 being clogged with water due to condensation caused by an excessive drop in the temperature of the combustion exhaust gas due to heat exchange. This can contribute to realizing a reliable hydrogen generator 100.

[0035] In this embodiment, as shown in FIG. 4 , the angle difference θ of the water flow direction FD with respect to the vertical direction AD increases when the water flows into the water flow path 130 from the supply port 120o and begins to flow downward within the water flow path 130, as the water strikes the inclined structure Si. After striking the inclined structure Si, the water flows through the evaporation section 111 along the inclined structure Si. In this configuration, the angle difference θ of the water flow direction FD with respect to the vertical direction AD is relatively small in the region from when the water flows into the water flow path 130 from the supply port 120o until when the water strikes the inclined structure Si, and is relatively large in the region from when the water flows into the evaporation section 111 along the inclined structure Si. This means that there is a region upstream of the water flow path 130 where the area where heat exchange between the combustion exhaust gas and the water occurs is relatively small. The existence of such a region makes it easy to avoid excessive heat exchange. Note that the angle difference θ may be zero or non-zero in the region from when the water flows into the water flow path 130 from the supply port 120o until when the water strikes the inclined structure Si.

[0036] In this embodiment, the water flow path 130 is arranged to surround an axis O extending in the up-down direction AD. As shown in Fig. 2, the supply port 120o of the supply pipe 120 is located at a predetermined circumferential position X0 in the circumferential direction CD of rotation around the axis O.

[0037] In this embodiment, the hydrogen generator 100 includes a hydrogen-containing gas flow channel 140 and a partition Qg. Hydrogen-containing gas from the reforming section 112 flows through the hydrogen-containing gas flow channel 140. The partition Qg separates the combustion exhaust gas flow channel 105 and the hydrogen-containing gas flow channel 140 into upper and lower sections. The partition Qg is located below the lower end B0 of the supply port 120o and above the upper end T0 of the sloped structure Si at the circumferential position X0. Specifically, the partition Qg is a partition plate 123. The partition Qg is located above the upper end Tt of the entire sloped structure Si. The partition Qg also separates the combustion exhaust gas flow channel 105 and the secondary hydrogen-containing gas flow channel 142 into upper and lower sections.

[0038] In this embodiment, the distance in the up-down direction AD between the lower end B0 of the supply port 120o and the upper end T0 at the circumferential position X0 of the inclined structure Si is expressed as distance Le. In this embodiment, distance Le is greater than at least one distance selected from the group consisting of a first distance L1 and a second distance L2. The first distance L1 is the equivalent circle diameter of the supply port 120o. The second distance L2 is the pitch in the up-down direction AD at which the inclined structure Si appears. The distance Le may be greater than twice or three times the first distance L1. The distance Le may be greater than twice or three times the second distance L2.

[0039] Here, the equivalent circular diameter of supply port 120o is the diameter of a circle having the same area as supply port 120o. The expression "equivalent circular diameter of supply port 120o" is not intended to limit the shape of supply port 120o. The shape of supply port 120o may be circular or may be a shape other than circular.

[0040] As the second distance L2, for example, the pitch in the up-down direction AD at which the inclined structure Si appears at the circumferential position X0 can be adopted.

[0041] [1-2. Operation] The operation of the hydrogen generator 100 will be described below.

[0042] In the hydrogen generator 100, raw material gas and water are supplied from a supply pipe 120 to an evaporation section 111. The water receives heat from the combustion exhaust gas while flowing spirally from top to bottom through the evaporation section 111. This converts the water into steam and mixes with the raw material gas. A mixed gas of the raw material gas and steam flows into a reforming section 112. The mixed gas is heated and reformed by a reforming catalyst into a primary hydrogen-containing gas containing hydrogen and carbon monoxide. The primary hydrogen-containing gas flows into a primary hydrogen-containing gas flow path 141, flows upward, and is supplied to a CO reduction section 113. The CO reduction section 113 reduces the carbon monoxide contained in the primary hydrogen-containing gas to generate a secondary hydrogen-containing gas. The secondary hydrogen-containing gas is discharged to the outside of the hydrogen generator 100 through a hydrogen gas exhaust pipe 122. The secondary hydrogen-containing gas is supplied to a hydrogen-utilizing device such as a fuel cell power generation device.

[0043] Combustion in the heating section 110 generates combustion exhaust gas. The combustion exhaust gas flows from top to bottom along the inner circumferential side of the combustion tube 101. Next, the combustion exhaust gas passes through the gap between the bottom of the inner tube 102 and the lower end of the combustion tube 101 and turns back upward. Next, the combustion exhaust gas exchanges heat with the air flow path 110b, the reforming section 112, and the evaporating section 111 while flowing through the combustion exhaust gas flow path 105. Next, the combustion exhaust gas is discharged from the combustion exhaust gas exhaust pipe 121 to the outside of the hydrogen generator 100.

[0044] Several other embodiments will be described below. In the following, elements common to the embodiments already described and the embodiments to be described thereafter will be given the same reference numerals, and their description may be omitted. The descriptions of the respective embodiments may be mutually applicable unless technically inconsistent. The respective embodiments may be combined with each other unless technically inconsistent.

[0045] (Embodiment 2) Hereinafter, the second embodiment will be described with reference to FIG.

[0046] [2-1.Configuration] FIG. 5 is an enlarged perspective view of the vicinity of the supply port 120o of the supply pipe 120 in the water flow path 130 of the second embodiment.

[0047] In the second embodiment, the hydrogen generator 100 includes a guide structure 250. The guide structure 250 guides water in the vertical direction AD from the supply port 120o of the supply pipe 120 to the evaporation section 111. With this configuration, the amount of heat that the water receives from the combustion exhaust gas from the supply port 120o until it reaches the evaporation section 111 can be stabilized, compared to a configuration in which the direction in which the water will flow down is unknown. That is, the amount of heat that the water receives in advance before flowing into the evaporation section 111 can be stabilized. This can stabilize the evaporation of water in the evaporation section 111.

[0048] Specifically, the guide structure 250 is a concave-convex structure. The guide structure 250 is provided on the inner cylinder 102. The guide structure 250 includes a convex structure 251, a convex structure 252, and a receding portion 253. The convex structures 251 and 252 protrude outward in the radial direction RD and extend in the up-down direction AD. The receding portion 253 is located between the convex structures 251 and 252 and recedes inward in the radial direction RD relative to the convex structures 251 and 252. Water is guided from the supply port 120o along the receding portion 253 to the evaporation section 111.

[0049] (Embodiment 3) Hereinafter, the third embodiment will be described with reference to FIGS.

[0050] [3-1.Configuration] Fig. 6 is an enlarged perspective view of the vicinity of the supply port 120o of the supply pipe 120 in the water flow path 130 of the third embodiment. Fig. 7 is an enlarged cross-sectional view of the vicinity of the supply port 120o of the supply pipe 120 in the water flow path 130 of the third embodiment.

[0051] In the third embodiment, the hydrogen generator 100 includes a first structure 301 and a second structure 302. The first structure 301 includes a sloped structure Si and a first surface 331s. The second structure 302 includes a second surface 332s. The first surface 331s and the second surface 332s face each other. The water flow path 130 includes a portion between the first surface 331s and the second surface 332s. At the circumferential position X0, the first surface 331s and the second surface 332s are located below the lower end B0 of the supply port 120o and above the upper end T0 of the sloped structure Si at the circumferential position X0. The contact angle of water with the second surface 332s is smaller than the contact angle of water with the first surface 331s. Specifically, the first structure 301 is the inner cylinder 102. The second structure 302 is the partition wall 103.

[0052] In the above configuration, the second surface 332s is more hydrophilic than the first surface 331s. Therefore, water flowing into the water flow path 130 from the supply port 120o flows more easily along the second surface 332s opposite the first surface 331s than along the first surface 331s on the side having the gradient structure Si. This configuration prevents excessive water from being introduced into the region along the gradient structure Si, thereby making it easier to avoid excessive heat exchange between the combustion exhaust gas and water. This reduces the risk of the combustion exhaust gas exhaust pipe 121 becoming clogged with water due to condensation caused by an excessive drop in the temperature of the combustion exhaust gas due to heat exchange. This can contribute to the realization of a reliable hydrogen generation device.

[0053] The contact angle of the second surface 332s with water that is smaller than the contact angle of the first surface 331s with water can be achieved, for example, by performing a surface treatment on the second surface 332s to improve hydrophilicity. The surface treatment may be a physical surface treatment or a chemical surface treatment. For example, the physical surface treatment is roughening the surface by etching. For example, the chemical surface treatment is introducing hydrophilic functional groups into the surface by exposing the surface to a flame. Another example of the chemical surface treatment is applying a coating agent to the surface. The coating agent includes, for example, titanium oxide.

[0054] The contact angle of the first surface 331s with water is, for example, not less than 45° and not more than 90°, and the contact angle of the second surface 332s with water is, for example, not less than 0° and not more than 45°.

[0055] (Addendum) The present disclosure provides the following techniques.

[0056] (Technology 1) a combustion exhaust gas flow path through which the combustion exhaust gas flows; a supply pipe having a supply port; a water flow path that is open to the supply port, allows water from the supply port to flow from top to bottom, and is along the combustion exhaust gas flow path, and includes an evaporation section that evaporates the water to generate water vapor; a reforming section to which the steam is supplied; an inclined structure inclined with respect to the vertical direction, the evaporation portion extends along the inclined structure, The upper end of the entire inclined structure is located lower than the lower end of the supply port. Hydrogen generator.

[0057] (Technology 2) a hydrogen-containing gas flow path through which the hydrogen-containing gas from the reforming unit flows; a partition that separates the combustion exhaust gas flow path and the hydrogen-containing gas flow path into upper and lower sections, The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, the partition is located below the lower end of the supply port and above the upper end of the inclined structure in the circumferential direction. The hydrogen generating device according to claim 1.

[0058] (Technology 3) The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, a distance in the up-down direction between the lower end of the supply port and an upper end of the inclined structure at the circumferential position is greater than at least one distance selected from the group consisting of a first distance and a second distance, the first distance is a circular equivalent diameter of the supply port, the second distance is a pitch in the vertical direction at which the inclined structure appears; The hydrogen generating device according to Technology 1 or 2.

[0059] (Technology 4) a guide structure that guides the water in the vertical direction from the supply port to the evaporation section, The hydrogen generating device according to any one of techniques 1 to 3.

[0060] (Technology 5) a first structure including the inclined structure and a first surface; a second structure including a second surface opposite the first surface; the water flow path includes a portion between the first surface and the second surface, The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, At the circumferential position, the first surface and the second surface are located below the lower end of the supply port and above the upper end of the inclined structure at the circumferential position, a contact angle of the second surface with water that is smaller than a contact angle of the first surface with water; The hydrogen generating device according to any one of the first to fourth aspects.

[0061] (Technology 6) The inclined structure is a spiral structure. The hydrogen generating device according to any one of techniques 1 to 5.

[0062] (Technology 7) The angle difference of the water flow direction with respect to the vertical direction increases when the water hits the inclined structure after the water flows into the water flow path from the opening and starts to flow from top to bottom in the water flow path. The hydrogen generating device according to any one of the first to sixth aspects. [Industrial Applicability]

[0063] The hydrogen generation device according to the present disclosure can be combined with a fuel cell power generation device, a hydrogen purification system, and the like. [Explanation of symbols]

[0064] 100 Hydrogen generator 101 Combustion tube 102 Inner cylinder 103 Bulkhead 104 Outer cylinder 105 Combustion exhaust gas flow path 110 Heating section 110a air intake 110b air flow path 110c Combustible gas flow path 110d Combustion section 111 Evaporation section 112 Reforming section 113 CO reduction unit 120 Supply pipe 120o opening (supply port) 121 Combustion exhaust gas exhaust pipe 122 Hydrogen gas exhaust pipe 123 Partition 130 Water channel 140, 141, 142 Hydrogen-containing gas flow path 161 Spiral structure 162 Lower structure 250 Guidance Structure 251, 252 Convex structure 253 Retreat 301 1st structure 302 Second structure 331s 1st page 332s 2nd page AD vertical direction B0 bottom end CD circumferential direction FD Flow direction O-axis Qg Divider RD radial direction Si graded structure T0, Tt upper end X0 Circumferential position

Claims

1. a combustion exhaust gas flow path through which the combustion exhaust gas flows; a supply pipe having a supply port; a water flow path that is open to the supply port, allows water from the supply port to flow from top to bottom, and is along the combustion exhaust gas flow path, and includes an evaporation section that evaporates the water to generate water vapor; a reforming section to which the steam is supplied; an inclined structure inclined with respect to the vertical direction, the evaporation portion extends along the inclined structure, The upper end of the entire inclined structure is located lower than the lower end of the supply port. Hydrogen generator.

2. a hydrogen-containing gas flow path through which the hydrogen-containing gas from the reforming unit flows; a partition that separates the combustion exhaust gas flow path and the hydrogen-containing gas flow path into upper and lower sections, The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, the partition is located below the lower end of the supply port and above the upper end of the inclined structure in the circumferential direction. The hydrogen generation device according to claim 1 .

3. The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, a distance in the up-down direction between the lower end of the supply port and an upper end of the inclined structure at the circumferential position is greater than at least one distance selected from the group consisting of a first distance and a second distance, the first distance is a circular equivalent diameter of the supply port, the second distance is a pitch in the vertical direction at which the inclined structures appear; The hydrogen generation device according to claim 1 .

4. a guide structure that guides the water in the vertical direction from the supply port to the evaporation section, The hydrogen generation device according to claim 1 .

5. a first structure including the inclined structure and a first surface; a second structure including a second surface opposite the first surface; the water flow path includes a portion between the first surface and the second surface, The water flow path is arranged to surround the axis extending in the vertical direction, the supply port is located at a predetermined circumferential position in the circumferential direction of rotation around the axis, At the circumferential position, the first surface and the second surface are located below the lower end of the supply port and above the upper end of the inclined structure at the circumferential position, a contact angle of the second surface with water that is smaller than a contact angle of the first surface with water; The hydrogen generation device according to claim 1 .

6. The inclined structure is a spiral structure. The hydrogen generation device according to claim 1 .

7. The angle difference of the water flow direction with respect to the vertical direction increases when the water hits the inclined structure after the water flows into the water flow path from the opening and starts to flow from top to bottom in the water flow path. The hydrogen generation device according to any one of claims 1 to 6.

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