JP2022121769A - Hydrogen generating apparatus - Google Patents

Abstract

To provide a low-cost hydrogen generating apparatus which reduces the manufacturing cost by reducing the welding portions between an air mixing cylinder and an outer cylinder of an evaporator when the air mixing part and the heat transfer buffer section are configured in the outer peripheral portion of the evaporator.SOLUTION: A hydrogen generating apparatus 100 of the invention includes following arrangement constitution: when a second mixing channel 143 constituting an air mixing section and a heat transfer buffer section 125 are arranged on the outer peripheral portion of an evaporator 121, the upper portion of a third partition wall 134 forming the heat transfer buffer portion 125 arranged between the outer peripheral side of the evaporator 121 and the inner peripheral side of a carbon monoxide reducer 123 and the lower portion of an air mixing cylinder 135 are arranged so as to overlap in the radial direction, wherein the inner peripheral surface of the upper end of the third partition wall 134 abuts on the lower peripheral surface of the air mixing cylinder 135, thereby the lower inner peripheral portion of the air mixing cylinder 135 is substantially in close contact with the first partition wall 132, and the lower inner peripheral portion of the air mixing cylinder 135 is not joined to the first partition wall 132.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to hydrogen generators.

Patent Literature 1 discloses a hydrogen generator having an air mixing section that mixes a hydrogen-containing gas containing carbon monoxide that has flowed out of a carbon monoxide reducer with air and supplies the mixture to a carbon monoxide remover.

In addition, Patent Document 1 discloses a configuration in which a partition wall forming the outer periphery of the evaporator and a partition wall inside the carbon monoxide reducer are provided with a heat transfer buffer formed facing each other with a gap therebetween.

In Patent Document 2, an air mixing section that promotes mixing of air and a hydrogen-containing gas flowing out of a carbon monoxide reducer is configured such that the top and bottom of the air mixing cylinder that constitutes the air mixing section are in contact with the evaporator outer cylinder. A hydrogen generator is disclosed.

Patent document 3 discloses an evaporator manufactured by setting a helically formed round bar (spiral bar) in an outer cylinder and expanding the inner cylinder as a manufacturing method. The evaporator includes an inner cylinder, an outer cylinder, and a helical rod tightly fitted between the inner cylinder and the outer cylinder.

Japanese Patent Publication No. 2014-530159 JP 2018-118863 A WO2007/125870

The present disclosure is a low-cost hydrogen generation that reduces manufacturing costs by reducing the number of welding points between the air mixing cylinder and the evaporator outer cylinder when configuring the air mixing part and the heat transfer buffer part on the outer peripheral part of the evaporator. Provide equipment.

In the present disclosure, the hydrogen generator includes a heating section, a combustion cylinder, a heating section partition, a first partition, a second partition, a combustion gas flow path, an evaporator, a reformer, and a return flow path. , a carbon monoxide reducer, a carbon monoxide remover, an air mixing cylinder, a partition member, an air supply pipe, a heat transfer buffer, and a third partition.

The heating unit is configured to burn the combustible gas and discharge flue gas. The combustion cylinder is configured to surround the outer periphery of the heating section. The heating part partition wall is configured to surround the outer periphery of the combustion tube.

The first partition wall is configured to surround the outer periphery of the heating part partition wall. The second partition is configured to surround the outer periphery of the first partition. The combustion gas flow path is formed between the combustion cylinder and the partition wall of the heating section, and configured to flow the combustion exhaust gas upward.

The evaporator is formed in the upper part between the heating part partition and the first partition, and is configured to heat the raw material gas and water with heat transmitted through the heating part partition and evaporate the water.

The reformer is formed by filling a reforming catalyst in a lower portion between the partition wall of the heating section and the first partition wall. Further, the reformer is configured to generate a primary hydrogen-containing gas containing carbon monoxide through a reforming reaction from a mixed gas of raw material gas and water vapor by heat transferred through the partition wall of the heating section.

The return channel is formed between the first partition and the second partition, and configured to flow upward the hydrogen-containing gas that has flowed out of the reformer.

The carbon monoxide reducer is formed by filling a portion adjacent to the outer peripheral side of the evaporator between the first partition wall and the second partition wall with a shift catalyst. Also, the carbon monoxide reducer is configured to reduce the concentration of carbon monoxide contained in the primary hydrogen-containing gas that has flowed out of the reformer through a modification reaction, and discharge it as a secondary hydrogen-containing gas.

The carbon monoxide remover is formed between the first partition wall and the second partition wall, above the carbon monoxide reducer and by filling a portion adjacent to the outer peripheral side of the evaporator with a selective oxidation catalyst. In addition, the carbon monoxide remover is configured to further reduce the concentration of carbon monoxide in the secondary hydrogen-containing gas discharged from the carbon monoxide reducer by a selective oxidation reaction and discharge it as a tertiary hydrogen-containing gas. .

The air mixing cylinder divides the space surrounded by the carbon monoxide reducer, the carbon monoxide remover, the first partition wall, and the second partition wall into a second mixing flow path, which is an inner peripheral space, and an outer peripheral space. configured to Also, the air mixing cylinder has a cylindrical shape, and the upper end inner peripheral portion is joined to the first partition wall.

The partition member has a donut disk shape, and has an inner peripheral side end fixed to the air mixing cylinder and an outer peripheral side end fixed to the second partition wall. Further, the partitioning member is configured to partition the outer peripheral space into the header channel, which is the outer peripheral upper space, and the first mixing channel, which is the outer peripheral lower space. The air supply tube is configured to supply air to the first mixing channel.

The heat transfer buffer is provided between the carbon monoxide reducer and the first partition so as to suppress heat exchange between the carbon monoxide reducer and the evaporator through the first partition. The third partition is configured to separate the carbon monoxide reducer and the heat transfer buffer.

The air mixing tube is a second mixing channel that allows the secondary hydrogen-containing gas mixed with the air in the first mixing channel to flow into the second mixing channel at a position facing the tip of the air supply pipe with the combustion tube interposed therebetween. It has an inlet, and a plurality of blowout holes provided in the circumferential direction for causing the secondary hydrogen-containing gas mixed with the air in the second mixing flow path to flow out to the header flow path.

In the hydrogen generator according to the present disclosure, the inner peripheral surface of the upper end of the third partition contacts the lower outer peripheral surface of the air mixing cylinder, thereby bringing the inner peripheral portion of the lower end of the air mixing cylinder into close contact with the first partition. and the inner peripheral portion of the lower end of the air mixing tube is not joined to the first partition wall.

In the hydrogen generator according to the present disclosure, the outflow of gas from the lower portion of the air mixing portion to the first mixing passage is suppressed without welding the lower portion of the air mixing portion to the evaporator outer cylinder, and the function of the air mixing portion is improved. can be maintained. Therefore, when configuring the air mixing section and the heat transfer buffer section on the outer periphery of the evaporator, the number of welding points between the air mixing cylinder and the evaporator outer cylinder is reduced to provide a low-cost hydrogen generator in which the manufacturing cost is reduced. be able to.

1 is a vertical cross-sectional view showing the configuration of a hydrogen generator according to Embodiment 1. FIG. Principal part vertical cross-sectional view showing the configuration around the air mixing part in Embodiment 1 AA sectional view of FIG. BB sectional view of FIG.

(Knowledge, etc. on which this disclosure is based)
At the time when the inventors arrived at the present disclosure, it was common for hydrogen generators to be designed so that an air mixing section and a heat transfer buffer section were arranged around the outer periphery of the evaporator.

The reason why the air mixing section is arranged on the outer periphery of the evaporator is to swirl the gas in the circumferential direction in the air mixing section that is in contact with the evaporator, thereby ensuring a mixing distance for uniformly mixing the air with the hydrogen-containing gas and the hydrogen This is to promote heat exchange between the contained gas and the evaporator, thereby lowering the temperature of the hydrogen-containing gas to a temperature suitable for the selective oxidation reaction. Thereby, a compact air mixing section can be formed without increasing the size of the device.

Disposing the heat transfer buffer between the carbon monoxide reducer and the evaporator suppresses the temperature on the inner peripheral side of the carbon monoxide reducer from becoming too low due to the low-temperature evaporator, This is to reduce the temperature distribution so that the entire shift catalyst layer mounted on the carbon monoxide reducer has a temperature distribution suitable for the shift reaction. As a result, it is possible to reduce the load of the shift conversion catalyst while maintaining the function of the carbon monoxide reducer.

Further, the upper and lower portions of the air mixing cylinder that constitutes the air mixing portion and the partition wall that constitutes the heat transfer buffer portion are connected to the outer periphery of the evaporator. In order to prevent hydrogen-containing gas from leaking from the connection between the upper and lower parts of the air mixing cylinder and the heat transfer buffer and the outer periphery of the evaporator, the partition walls constituting the upper and lower parts of the air mixing cylinder and the heat transfer buffer are evaporating. Welded to the outer circumference of the vessel.

Welding to the evaporator outer cylinder may adversely affect the contact state between the internal helical rod and the evaporator outer cylinder due to thermal strain during welding.

When attaching parts that require airtightness, such as a mixing cylinder, to the outer cylinder of the evaporator, it is necessary to ensure that the tightness of the spiral rod is not loose, that the heat input is as uniform as possible, and that airtightness is ensured. Welding needs to be performed at a reduced welding speed, resulting in high welding costs.

Under such circumstances, the inventors have come to constitute the main subject of the present disclosure in order to solve the problem of reducing the manufacturing cost while configuring the air mixing section and the heat transfer buffer section in the outer peripheral portion of the evaporator. rice field.

Therefore, the present disclosure provides low-cost hydrogen generation that reduces manufacturing costs by reducing the number of welding points between the air mixing cylinder and the evaporator outer cylinder when configuring the air mixing part and the heat transfer buffer part in the outer peripheral part of the evaporator. Provide equipment.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted.

It should be noted that the accompanying drawings and the following description are provided to allow those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

(Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. 1 to 4. FIG.

[1-1. Constitution]
FIG. 1 illustrates a longitudinal sectional view showing the configuration of the hydrogen generator in this embodiment. As shown in FIG. 1, the hydrogen generator 100 mainly includes a heating unit 120, an evaporator 121, a reformer 122, and a carbon monoxide reducer in a space partitioned by a plurality of concentric partition walls. 123 , a carbon monoxide remover 124 , a heat transfer buffer 125 , and an air mixing section composed of a first mixing channel 142 and a second mixing channel 143 . Moreover, the outer peripheral portion of the outermost partition wall is covered with a heat insulating material 170 .

The concentric partition walls are arranged in the order of the combustion cylinder 130, the heating part partition wall 131, the first partition wall 132, and the second partition wall 133 from the center side. Lower ends of the heating part partition 131 and the second partition 133 are joined to a bottom plate covering the lower opening of the second partition 133 .

A gap is provided between the lower end of the combustion tube 130 and the bottom plate so that the combustion exhaust gas of the heating part 120 can be folded back from the inside to the outside of the combustion tube 130 .

A gap is provided between the lower end of the first partition 132 and the bottom plate so that the primary hydrogen-containing gas that has flowed out of the reformer 122 can return from the inside to the outside of the first partition 132 .

The third partition 134 is arranged to cover a portion of the outer peripheral side of the first partition 132 with a gap therebetween. A lower end of the third partition 134 is fixed (joined) to the first partition 132 .

The air mixing cylinder 135 is arranged so as to cover a portion of the outer peripheral side of the first partition 132 with a gap therebetween. The upper end of the air mixing cylinder 135 is fixed (joined) to the first partition wall 132 . The lower portion of the air mixing tube 135 is arranged to radially overlap the inner side of the upper portion of the third partition wall 134 . The partition member 136 is arranged so as to vertically divide the space between the air mixing tube 135 and the second partition 133 . A stainless steel material is used for these partition walls.

The heating unit 120 is arranged at the center of the concentric circles. The heating unit 120 is a burner that burns raw material gas such as city gas and combustible gas such as hydrogen-containing off-gas returned from the power generation stack. An annular combustion gas flow path 140 is formed between the combustion cylinder 130 surrounding the outer circumference of the heating section 120 and the heating section partition wall 131 further surrounding the outer circumference. A combustion gas pipe 163 is connected to the upper portion of the combustion gas flow path 140 .

The evaporator 121 is formed of a helical flow path formed by closely contacting a helical rod between the heating part partition 131 and the first partition 132 . A raw material supply pipe 161 is connected to the upper portion of the evaporator 121 .

The reformer 122 is arranged below the heating section partition 131 and the first partition 132 , that is, below the evaporator 121 . The reformer 122 has an annular space filled with granular reforming catalyst, and the upper and lower surfaces of the reforming catalyst layer are perforated plates that allow gas to pass through and prevent catalyst particles from passing through. etc. is covered.

As the reforming catalyst, catalyst particles obtained by supporting platinum, rhodium, ruthenium, nickel, etc. on an alumina carrier are used. An annular return channel 141 is formed between the first partition 132 and the second partition 133 on the outer peripheral side of the reformer 122 .

The carbon monoxide reducer 123 is such that the annular space between the second partition 133 and the third partition 134 is filled with granular shift catalyst, and the upper and lower surfaces of the shift catalyst layer are gas-permeable. It is covered with a perforated plate that does not let catalyst particles pass through. As the conversion catalyst, catalyst particles in which platinum, copper, zinc or the like is supported on an alumina carrier are used.

The heat transfer buffer 125 is an annular space between the first partition 132 and the third partition 134 on the inner peripheral side of the carbon monoxide reducer 123 .

The air mixing section is composed of a first mixing channel 142 and a second mixing channel 143 formed above the carbon monoxide reducer 123 and the heat transfer buffer 125 .

The first mixing channel 142 is a channel formed between the upper partitioning member 136 and the lower carbon monoxide reducer 123 in the annular space between the air mixing cylinder 135 and the second partition wall 133. is. The second mixing channel 143 is a channel formed between the air mixing tube 135 and the first partition wall 132 . Also, an air supply pipe 137 is connected to the first mixing channel 142 .

The air mixing cylinder 135 has a second mixing channel inlet 150 that communicates with the first mixing channel 142 and the second mixing channel 143 arranged on the opposite side of the air supply pipe 137, and the second mixing channel 143 and a plurality of blowout holes 151 arranged in the circumferential direction communicating with the header flow path 144 . The second mixing channel inlet 150 has an opening only in one circumferential direction.

Here, after the evaporator 121 is formed, the air mixing cylinder 135 is fixed (bonded) by welding the upper end of the air mixing cylinder 135 to the first partition wall 132 . The lower end of the air mixing cylinder 135 is not welded to the first partition 132 , and the inner peripheral portion of the lower end of the air mixing cylinder 135 is configured to be in close contact with the first partition 132 .

Next, the third partition wall 134 is placed by sliding the outer side of the first partition wall 132 so that the upper part of the third partition wall 134 covers the lower part of the air mixing cylinder 135, and then the lower end of the third partition wall 134 is moved to the first position. It is fixed (joined) by welding to the partition wall 132 to form the heat transfer buffer portion 125 .

In the evaporator 121, a helical rod is set on the first partition wall 132, which is the outer cylinder, and the heating part partition wall 131, which is the inner cylinder, is expanded, so that the helical rod is attached to the heating part partition wall 131 and the first partition wall 132. make close contact.

In order to attach the air mixing cylinder 135 and the third partition 134 to the outer periphery of the evaporator 121, the contact between the first partition 132, which is the outer cylinder of the evaporator 121, and the helical rod is loose. TIG welding is performed at a slow speed so that the heat input is as uniform as possible and airtightness is ensured.

The header channel 144 consists of a space surrounded by the air mixing cylinder 135 , the second partition 133 , the partition member 136 and the carbon monoxide remover 124 .

The carbon monoxide remover 124 has a selective oxidation catalyst filled in the annular space between the first partition 132 and the second partition 133, and the upper and lower surfaces of the selective oxidation catalyst layer are gas-permeable. It is covered with a perforated plate that does not let catalyst particles pass through. As the selective oxidation catalyst, catalyst particles in which platinum, ruthenium, or the like is supported on an alumina carrier are used. A product gas pipe 162 is connected to the upper space of the carbon monoxide remover 124 .

The heat insulator 170 is a microporous material that prevents heat dissipation from the hydrogen generator 100 .

[1-2. motion]
The operation and effects of the hydrogen generator 100 of the present embodiment configured as described above will be described below.

The heating unit 120 burns the supplied combustible gas and discharges flue gas. The combustion exhaust gas that has flowed out from the heating part 120 passes through the gap between the lower end of the combustion tube 130 and the bottom plate, turns back from the inside to the outside of the combustion tube 130, and flows upward through the combustion gas flow path 140, and the combustion gas It is discharged from the pipe 163 to the outside.

The raw material gas and water supplied from the raw material supply pipe 161 to the evaporator 121 flow through the spiral flow path in the evaporator 121, and the heat transmitted through the heating part partition 131 and the first partition 132 reaches about 400 degrees Celsius. high-temperature steam and raw material gas, and flow out to the reformer 122 . Here, the raw material gas is desulfurized city gas containing methane as a main component.

In the reformer 122, the raw material gas and steam are reformed by the action of the reforming catalyst to generate a primary hydrogen-containing gas containing approximately 10% carbon monoxide. Although the reforming reaction is an endothermic reaction, heat is supplied from the combustion gas flow path 140 through the heating section partition wall 131 so that the reforming reaction proceeds sufficiently. The gas temperature at the outlet of the reformer 122 is about 700 degrees.

The primary hydrogen-containing gas that has flowed out of the reformer 122 passes through the gap between the lower end of the first partition 132 and the bottom plate, turns back from the inside to the outside of the first partition 132, and passes upward through the return flow path 141. The heat is supplied to the reformer 122 and the evaporator 121 through the first partition 132 .

In the primary hydrogen-containing gas supplied to the carbon monoxide reducer 123, the concentration of carbon monoxide in the primary hydrogen-containing gas is reduced to 1% or less by a shift reaction due to the action of the shift catalyst mounted on the carbon monoxide reducer 123. It becomes reduced secondary hydrogen-containing gas and flows out from the carbon monoxide reducer 123 to the first mixing flow path 142 .

The transformation reaction is an exothermic reaction, but by exchanging heat with the evaporator 121 arranged on the inner peripheral side of the carbon monoxide reducer 123 via the heat transfer buffer 125, the carbon monoxide reducer 123 is able to perform the transformation reaction. is kept in the range of about 200 to 300 degrees suitable for

The secondary hydrogen-containing gas that has flowed into the first mixing passage 142 is mixed with the air supplied from the air supply pipe 137 while being mixed with the air supplied from the air supply pipe 137. It flows into the second mixing channel 143 from the mixing channel inlet 150 .

The secondary hydrogen-containing gas mixed with the air that has flowed into the second mixing channel 143 flows in the second mixing channel 143 so as to swirl in the circumferential direction, and flows above the second mixing channel inlet 150. , and flows out from the outlet holes 151 into the header flow path 144 . The detailed gas flow in the air mixing portions of the first mixing channel 142 and the second mixing channel 143 will be described later.

The secondary hydrogen-containing gas uniformly mixed with air is supplied from header flow path 144 to carbon monoxide remover 124 . In the secondary hydrogen-containing gas mixed with air, the concentration of carbon monoxide in the secondary hydrogen-containing gas is further reduced by a selective oxidation reaction due to the action of the selective oxidation catalyst mounted on the carbon monoxide remover 124, A tertiary hydrogen-containing gas with a carbon monoxide concentration of about 10 ppm is obtained.

The selective oxidation reaction is an exothermic reaction, but by exchanging heat with the evaporator 121 arranged on the inner peripheral side of the carbon monoxide remover 124, the carbon monoxide remover 124 is heated to about 120°C suitable for the selective oxidation reaction. to 160 degrees.

The tertiary hydrogen-containing gas is supplied to a fuel cell stack (not shown) or the like connected to the outside of the hydrogen generator 100 from a product gas pipe 162 opened to the outlet space of the carbon monoxide remover 124 .

The detailed gas flow in the air mixing section will be described with reference to FIGS. 2 to 4. FIG.

FIG. 2 illustrates a vertical cross-sectional view showing the configuration around the air mixing section in Embodiment 1. As shown in FIG.

FIG. 3 illustrates a cross-sectional view showing the flow of gas in the vicinity of the inflow part of the air mixing part in Embodiment 1. As shown in FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG.

The air mixing section is composed of a first mixing channel 142 and a second mixing channel 143 . The first mixing passage 142 is supplied with air from the air supply pipe 137 and secondary hydrogen-containing gas with reduced carbon monoxide concentration from the outlet of the carbon monoxide reducer 123 .

The air supplied from the air supply pipe 137 flows into the second mixing passage 143 from the second mixing passage inlet 150 arranged on the opposite side of the air supply pipe 137 while being mixed with the secondary hydrogen-containing gas.

The second mixing channel inlet 150 has an opening only in one circumferential direction. The mixed gas of the flowing air and the secondary hydrogen-containing gas flows in the mixing section so as to swirl in the second mixing channel 143 in the circumferential direction. This secures a mixing distance for mixing the secondary hydrogen-containing gas and air, and promotes heat exchange between the mixed gas and the evaporator 121 .

FIG. 4 illustrates a cross-sectional view showing gas flow in the vicinity of the outflow portion of the air mixing section in Embodiment 1. As shown in FIG. FIG. 4 is a cross-sectional view taken along line BB shown in FIG.

After the mixed gas is swirled in the second mixing passage 143 in the circumferential direction to promote mixing with air and heat exchange with the evaporator 121, the mixed gas is discharged from the blowout hole 151 provided in the upper part of the second mixing passage 143. It is supplied to carbon oxide remover 124 .

As shown in FIG. 2, the inner periphery of the lower end of the air mixing tube 135 is not welded to the first partition 132, but the inner peripheral surface of the upper end of the third partition 134 is connected to the outer periphery of the lower end of the air mixing tube 135. The lower end inner peripheral portion of the air mixing cylinder 135 is brought into substantially close contact with the first partition wall 132 by contacting the surface.

The flow path resistance between the first mixing channel 142 and the heat transfer buffer portion 125 and between the lower end inner peripheral portion of the air mixing tube 135 and the first partition wall 132 increases, and the heat transfer buffer portion 125 and the first mixed flow The flow of gas between passages 142 is suppressed.

Further, since the lower portion of the air mixing cylinder 135 is regulated in the radial direction by the third partition 134, the contact state between the lower portion of the air mixing cylinder 135 and the first partition 132 is maintained. Without welding to 132, outflow of gas from the lower part of the second mixing channel 143 to the heat transfer buffer 125 is suppressed.

[1-3. effects, etc.]
As described above, in the present embodiment, the hydrogen generator 100 includes the heating portion 120, the combustion cylinder 130, the heating portion partition wall 131, the first partition wall 132, the second partition wall 133, the combustion gas flow path 140 , evaporator 121, reformer 122, return channel 141, carbon monoxide reducer 123, carbon monoxide remover 124, air mixing cylinder 135, partitioning member 136, and air supply pipe 137 , a heat transfer buffer 125 , and a third partition 134 .

The heating unit 120 is configured to burn combustible gas and discharge flue gas. Combustion cylinder 130 is configured to surround the outer circumference of heating unit 120 . The heating part partition 131 is configured to surround the outer circumference of the combustion cylinder 130 .

The first partition 132 is configured to surround the outer circumference of the heating portion partition 131 . The second partition 133 is configured to surround the outer periphery of the first partition 132 . The combustion gas flow path 140 is formed between the combustion cylinder 130 and the heating section partition 131 and configured to flow the combustion exhaust gas upward.

The evaporator 121 is formed in the upper part between the heating part partition 131 and the first partition 132, and is configured to heat the raw material gas and water with the heat transmitted through the heating part partition 131 and evaporate the water. be done.

The reformer 122 is formed by filling a reforming catalyst in the lower portion between the heating part partition 131 and the first partition 132 . Further, the reformer 122 is configured to generate a primary hydrogen-containing gas containing carbon monoxide through a reforming reaction from a mixed gas of raw material gas and water vapor by heat transmitted through the heating section partition wall 131 .

The return flow path 141 is formed between the first partition 132 and the second partition 133 and configured to allow the hydrogen-containing gas that has flowed out of the reformer 122 to flow upward.

The carbon monoxide reducer 123 is formed by filling a portion adjacent to the outer periphery of the evaporator 121 between the first partition 132 and the second partition 133 with a shift catalyst. Also, the carbon monoxide reducer 123 is configured to reduce the concentration of carbon monoxide contained in the primary hydrogen-containing gas that has flowed out of the reformer 122 through a modification reaction, and discharge it as a secondary hydrogen-containing gas.

The carbon monoxide remover 124 fills a portion of the carbon monoxide remover 124 between the first partition 132 and the second partition 133 above the carbon monoxide reducer 123 and adjacent to the outer peripheral side of the evaporator 121 with a selective oxidation catalyst. It is formed. In addition, the carbon monoxide remover 124 is configured to further reduce the carbon monoxide concentration of the secondary hydrogen-containing gas discharged from the carbon monoxide reducer 123 by a selective oxidation reaction and discharge it as a tertiary hydrogen-containing gas. be done.

The air mixing cylinder 135 divides the space surrounded by the carbon monoxide reducer 123, the carbon monoxide remover 124, the first partition 132, and the second partition 133 into the second mixing channel 143, which is the inner space. It is configured so as to be partitioned into a space on the outer peripheral side. The air mixing tube 135 has a tubular shape, and the upper end inner peripheral portion thereof is joined to the first partition wall 132 .

The partitioning member 136 has a donut disk shape, and has an inner peripheral side end fixed to the air mixing cylinder 135 and an outer peripheral side end fixed to the second partition wall 133 . In addition, the dividing member 136 is configured to divide the outer peripheral space into a header channel 144 that is an outer peripheral upper space and a first mixing channel 142 that is an outer peripheral lower space. Air supply tube 137 is configured to supply air to first mixing channel 142 .

The heat transfer buffer 125 is arranged between the carbon monoxide reducer 123 and the first partition 132 so that heat exchange between the carbon monoxide reducer 123 and the evaporator 121 via the first partition 132 is suppressed. be provided. Third partition 134 is configured to separate carbon monoxide reducer 123 and heat transfer buffer 125 .

The air mixing cylinder 135 allows the secondary hydrogen-containing gas mixed with the air in the first mixing channel 142 to flow into the second mixing channel 143 at a position facing the tip of the air supply pipe 137 with the combustion cylinder 130 interposed therebetween. It has a second mixing channel inlet 150 and a plurality of blowout holes 151 provided in the circumferential direction for causing the secondary hydrogen-containing gas mixed with the air in the second mixing channel 143 to flow out to the header channel 144 .

In the hydrogen generator 100 according to the present disclosure, the inner peripheral surface of the upper end of the third partition 134 contacts the lower outer peripheral surface of the air mixing cylinder 135, so that the inner peripheral surface of the lower end of the air mixing cylinder 135 is moved to the first partition. 132 , and the inner peripheral portion of the lower end of the air mixing cylinder 135 is not joined to the first partition 132 .

As a result, the channel resistance between the first mixing channel 142 and the heat transfer buffer 125 increases. Further, since the lower portion of the air mixing tube 135 is radially restricted by the third partition 134, the contact state between the lower portion of the air mixing tube 135 and the first partition 132 is maintained.

As described above, the outflow of gas from the lower part of the air mixing section to the first mixing flow path 142 is suppressed without welding (joining) the lower part of the air mixing cylinder 135 to the first partition 132, and the function of the air mixing section is maintained. be able to.

Therefore, when the air mixing portion and the heat transfer buffering portion 125 are formed on the outer periphery of the evaporator 121, the number of welding points between the air mixing tube 135 and the first partition 132, which is the outer periphery of the evaporator 121, is reduced, thereby reducing the manufacturing cost. A reduced, low-cost hydrogen generator 100 can be provided.

Note that the above-described embodiment is for illustrating the technology in the present disclosure, and various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

INDUSTRIAL APPLICABILITY The present disclosure is applicable to energy equipment that generates hydrogen from raw material gas and water. Specifically, the present disclosure is applicable to hydrogen production devices, fuel cell systems, and the like.

REFERENCE SIGNS LIST 100 hydrogen generator 120 heating unit 121 evaporator 122 reformer 123 carbon monoxide reducer 124 carbon monoxide remover 125 heat transfer buffer 130 combustion cylinder 131 heating unit partition 132 first partition 133 second partition 134 third partition 135 Air mixing tube 136 Partition member 137 Air supply pipe 140 Combustion gas channel 141 Return channel 142 First mixing channel 143 Second mixing channel 144 Header channel 150 Second mixing channel inlet 151 Blowout hole 161 Raw material supply pipe 162 Product gas pipe 163 Combustion gas pipe 170 Thermal insulation

Claims (1)

a heating unit that burns combustible gas and discharges combustion exhaust gas;
a combustion cylinder surrounding the outer periphery of the heating part;
a heating part partition surrounding the outer periphery of the combustion cylinder;
a first partition surrounding the outer periphery of the heating part partition;
a second partition surrounding the outer periphery of the first partition;
a combustion gas flow path formed between the combustion cylinder and the partition wall of the heating section for upwardly flowing the combustion exhaust gas;
an evaporator that is formed in an upper portion between the heating part partition and the first partition and heats a raw material gas and water with heat transferred through the heating part partition to evaporate the water;
A reforming catalyst is filled in the lower part between the partition wall of the heating part and the first partition wall, and the heat transmitted through the partition wall of the heating part forms monoxidation from the mixed gas of the raw material gas and water vapor through a reforming reaction. a reformer that produces a primary hydrogen-containing gas containing carbon;
a return passage formed between the first partition and the second partition for upwardly flowing the hydrogen-containing gas that has flowed out of the reformer;
Between the first partition wall and the second partition wall, a portion adjacent to the outer peripheral side of the evaporator is filled with a shift conversion catalyst, and the first portion contained in the primary hydrogen-containing gas that has flowed out of the reformer a carbon monoxide reducer that reduces the concentration of carbon oxide by a denaturation reaction and discharges it as a secondary hydrogen-containing gas;
Between the first partition wall and the second partition wall, a portion above the carbon monoxide reducer and adjacent to the outer peripheral side of the evaporator is filled with a selective oxidation catalyst to form the carbon monoxide reducer. a carbon monoxide remover that further reduces the concentration of carbon monoxide in the secondary hydrogen-containing gas discharged from the device by a selective oxidation reaction and discharges it as a tertiary hydrogen-containing gas;
A space surrounded by the carbon monoxide reducer, the carbon monoxide remover, the first partition wall, and the second partition wall is divided into a second mixing flow path, which is an inner peripheral space, and an outer peripheral space. a cylindrical air mixing cylinder whose upper end inner circumference is joined to the first partition;
The inner peripheral side end portion is fixed to the air mixing cylinder, the outer peripheral side end portion is fixed to the second partition wall, and the outer peripheral side space is divided into a header flow path which is an outer peripheral side upper space and a first outer peripheral side space which is an outer peripheral side lower space. A doughnut-shaped partitioning member partitioned into a mixing channel,
an air supply pipe that supplies air to the first mixing channel;
The first gas is provided between the carbon monoxide reducer and the first partition so as to suppress heat exchange between the carbon monoxide reducer and the evaporator through the first partition. a heat transfer buffer communicating with the mixing channel;
a third partition partitioning the carbon monoxide reducer and the heat transfer buffer;
A hydrogen generator comprising
The air mixing cylinder flows the secondary hydrogen-containing gas mixed with the air in the first mixing passage into the second mixing passage at a position facing the tip of the air supply pipe with the combustion cylinder interposed therebetween. and a plurality of blowout holes provided in the circumferential direction for causing the secondary hydrogen-containing gas mixed with the air in the second mixing passage to flow out to the header flow passage,
The inner peripheral surface of the upper end of the third partition is in contact with the outer peripheral surface of the lower part of the air mixing cylinder, so that the inner peripheral part of the lower end of the air mixing cylinder is substantially in close contact with the first partition,
The hydrogen generator, wherein the inner peripheral portion of the lower end of the air mixing tube is not joined to the first partition wall.

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