TWM668299U - Ring Catalyst Unit - Google Patents

Abstract

An annular catalyst unit includes a first metal annular body, a second metal annular body, and an annular honeycomb structure located between the first metal annular body and the second metal annular body. The annular honeycomb structure includes a wave plate and a flat plate that are stacked and wound on each other and accommodated in the first metal annular body. The flat plate has a first area, the wave plate has a wave cross section and has a second area and a continuous area connected to the second area. The wave cross section includes a plurality of wave crests and a plurality of wave troughs. The wave plate has a solder area that overlaps at least a portion of at least one of the second area and the continuous area. The outer sides of the wave crests and the wave troughs located in the solder area have solder. One end of the flat plate and one end of the wave plate are connected to the outer surface of the second metal annular body.

Description

Ring Catalyst Unit

The present disclosure relates to an annular catalyst monomer, and in particular to an annular catalyst monomer suitable for being installed in a hydrogen fuel cell.

Hydrogen fuel cells generate exhaust gas during operation. Therefore, a catalyst converter with the function of purifying exhaust gas is installed in hydrogen fuel cells. The catalyst converter is a ring-shaped honeycomb monomer coated with a catalyst. The ring-shaped honeycomb monomer includes a metal inner ring, a metal outer ring, and a honeycomb structure fixed between the metal inner ring and the metal outer ring. The honeycomb structure is formed by stacking and winding a flat plate and a corrugated plate, and the honeycomb structure is fixed between the metal inner ring and the metal outer ring by welding. In addition, the surface of the honeycomb structure is coated with a catalyst material. Therefore, when the exhaust gas passes through the annular honeycomb monomer, the catalyst can convert the harmful exhaust gas into harmless gas, thereby reducing the pollution of the gas emitted during the operation of the hydrogen fuel cell to the outside world.

However, since the gas channel in the annular honeycomb monomer is in a straight line shape, the time that the exhaust gas stays in the annular honeycomb monomer is too short, resulting in insufficient conversion efficiency of the annular honeycomb monomer.

In view of the above problems, the present disclosure provides a ring-shaped catalyst monomer.

According to some embodiments, the annular catalyst unit includes a first metal annular body, a second metal annular body, and an annular honeycomb structure. The second metal annular body is located in the first metal annular body, and the diameter of the second metal annular body is smaller than the diameter of the first metal annular body. The annular honeycomb structure is located between the first metal annular body and the second metal annular body. The annular honeycomb structure includes a corrugated plate and a flat plate, which are stacked and wound with each other and accommodated in the first metal annular body. The flat plate has a first area, the corrugated plate has a corrugated cross section and has a second area and a continuous area. The second area is connected to the continuous area. The corrugated cross section includes multiple crests and multiple troughs. The wave plate has a solder area, and the solder area overlaps at least a portion of at least one of the second area and the continuous area. The outer sides of the wave crests and the wave troughs in the solder area have solder, and the area ratio of the solder area to the wave plate is 20% to 67%. One end of the flat plate and one end of the wave plate are connected to the outer surface of the second metal ring body.

According to some embodiments, the overlapping portion is located in the second region, and the area ratio of the solder region to the wave plate is 40% to 67%.

According to some embodiments, the overlapping portion is located in the continuous region, and the area ratio of the solder region to the wave plate is 20% to 33%.

According to some embodiments, the overlapping portion is located in the second region and the continuous region, and the area ratio of the solder region to the wave plate is 21% to 40%.

In some embodiments, the corrugated plate is integrally connected to the flat plate; but in other embodiments, the corrugated plate and the flat plate are different plates.

In summary, according to one or more embodiments, the solder area of the annular catalyst unit and the corrugated plate have an appropriate area ratio, so that the annular honeycomb structure formed by the corrugated plate and the flat plate can be stably fixed between the first metal annular body and the second metal annular body, so that the annular honeycomb structure has good mechanical strength. In addition, according to one or more embodiments, the flat plate and the corrugated plate of the annular honeycomb structure have an appropriate opening rate, so that the exhaust gas can stay in the annular catalyst unit for a longer time, thereby increasing the turbulence effect and allowing the annular catalyst unit to have a better conversion efficiency. Furthermore, due to the opening design of the flat plate and the corrugated plate of the aforementioned annular honeycomb structure, the exhaust gas treatment process during the operation of the hydrogen fuel cell also has better thermal uniformity.

Please refer to Figures 1 and 2. Figure 1 is a three-dimensional schematic diagram of an annular catalyst monomer 100 according to some embodiments. Figure 2 is an exploded schematic diagram of an annular catalyst monomer 100 according to some embodiments. As shown in Figures 1 and 2, an annular catalyst monomer 100 is suitable for being arranged in a hydrogen fuel cell system. The annular catalyst monomer 100 can be coated with a catalyst (usually containing precious metals such as palladium (Pd), platinum (Pt) and ruthenium (Ru)). Therefore, when the exhaust gas passes through the annular catalyst monomer 100, the palladium, platinum and ruthenium in the catalyst material can oxidize the carbon monoxide and hydrocarbons contained in the harmful exhaust gas into carbon dioxide and water respectively. Thereby, the catalyst can convert harmful exhaust gas passing through the annular catalyst unit 100 into harmless gas, thereby reducing the pollution to the outside air caused by the operation of the fuel cell.

Please continue to refer to Figures 1, 2, and 3A to 3C. Figure 3A is a three-dimensional schematic diagram of the flat plate 20 and the wave plate 30 of the annular catalyst unit 100 according to some embodiments. Figure 3B is a side view schematic diagram of the flat plate 20 and the wave plate 30 of the annular catalyst unit 100 before being stacked on each other according to some embodiments. Figure 3C is a side view schematic diagram of the flat plate 20 and the wave plate 30 of the annular catalyst unit 100 after being stacked on each other according to some embodiments. As shown in Figures 1, 2, and 3A to 3C, the annular catalyst unit 100 includes a first metal annular body 12, a second metal annular body 14, and an annular honeycomb structure H. As shown in FIG. 1 , the second metal annular body 14 is located in the first metal annular body 12, and the diameter of the second metal annular body 14 is smaller than the diameter of the first metal annular body 12. The annular honeycomb structure H is located between the first metal annular body 12 and the second metal annular body 14, and the annular honeycomb structure H is formed by overlapping and winding a flat plate 20 and a corrugated plate 30 (as shown in FIG. 3B and FIG. 3C ) and is accommodated in the first metal annular body 12. One end of the flat plate 20 and one end of the corrugated plate 30 are connected to the outer surface 14a of the second metal annular body 14 (described later).

In some embodiments, the first metal ring body 12, the second metal ring body 14, the flat plate 20 and the corrugated plate 30 are made of stainless steel plates, but the present invention is not limited thereto. In some embodiments, the metal plate can be rolled into a cylinder by a machine, and then the two ends are welded to form the first metal ring body 12; similarly, the second metal ring body 14 can also be made in the same way.

The length and diameter of the annular catalyst unit 100, the length and thickness of the corrugated plate 30 and the flat plate 20 can be designed according to the requirements, for example, according to the size of the hydrogen fuel cell system. In some embodiments, the length of the annular catalyst unit 100 can be about 30 mm to 120 mm, the diameter of the annular catalyst unit 100 (i.e., the diameter of the first metal annular body 12) can be about 150 mm to 350 mm, and the diameter of the second metal annular body 14 can be about 100 mm to 250 mm. In some embodiments, the thickness of the corrugated plate 30 and the flat plate 20 can be about 0.02 mm to 0.2 mm. In some embodiments, the length of the wave plate 30 may be approximately 5790 mm to 68350 mm, and the length of the flat plate 20 may be approximately 5950 mm to 69130 mm. In some embodiments, the length and diameter of the annular catalyst unit 100 are approximately 40 mm and 150 mm, respectively, the length of the wave plate 30 is approximately 640 mm, and the length of the flat plate 20 is approximately 660 mm. In some embodiments, the length and diameter of the annular catalyst unit 100 are approximately 80 mm and 350 mm, respectively. The length of the wave plate 30 is approximately 5840 mm, and the length of the flat plate 20 is approximately 5920 mm.

In some embodiments, the plate 20 has a first region 21 (in a dotted frame), and the first region 21 has a plurality of first holes 21a, and the aperture (diameter) size (Φ) of each first hole 21a is between 0.8 mm and 5 mm. The apertures of the first holes 21a can be the same or different, and the hole spacing between adjacent first holes 21a can be the same or different. The wave plate 30 includes a second region 31 (in a dotted frame) and a continuous region 32, and the second region 31 is connected to the continuous region 32. The second region 31 has a plurality of second holes 31a, and the aperture size of each second hole 31a is between 0.8 mm and 5 mm. The apertures of the second holes 31a can be the same or different, and the hole spacing between adjacent second holes 31a can be the same or different.

Please refer to FIG. 3A again. The second area 31 of the wave plate 30 has a second hole 31a, and the continuous area 32 refers to the portion of the wave plate 30 where the second hole 31a is not formed. In some embodiments, the wave plate 30 is composed of the second area 31 and the continuous area 32. The second area 31 refers to the area where the second hole 31a is located, and the boundary of the second area 31 may be aligned with the outer edge of the outermost second hole 31a in the second area 31. The continuous area 32 is the area outside the second area 31 on the wave plate 30. Correspondingly, the flat plate 20 is composed of the first area 21 and the continuous area 22. The first area 21 refers to the area where the first hole 21a is located, and the boundary of the first area 21 may be aligned with the outer edge of the outermost first hole 21a in the first area 21. The continuous area 22 is an area outside the first area 21 on the flat plate 20. In some embodiments, the first area 21 and the continuous area 22 of the flat plate 20 and the second area 31 and the continuous area 32 of the wave plate 30 may correspond to each other and have the same configuration. For the convenience of explanation, the following only takes the wave plate 30 as an example to explain the different configurations of its second area 31 and the continuous area 32.

Please refer to FIG. 4. FIG. 4 is a schematic diagram of the second area 31 and the continuous area 32 of the wave plate 30 that has not yet been bent into a wave shape of the annular catalyst unit 100 according to some embodiments. For the convenience of diagrammatic representation, FIG. 4 uses the wave plate 30 that has not yet been bent into a wave shape to illustrate the configuration relationship between the second area 31 and the continuous area 32. As shown in FIG. 4, in this embodiment, the second area 31 is roughly rectangular, and the continuous area 32 is in the shape of a square. It should be noted that the shape of the second area 31 is only an example, and the present invention is not limited thereto.

Please refer to FIG. 5A and FIG. 5B. FIG. 5A is a schematic diagram (I) of the first region 21 of the flat plate 20 of the annular catalyst unit 100 according to some embodiments. FIG. 5B is a schematic diagram (II) of the first region 21 of the flat plate 20 of the annular catalyst unit 100 according to some embodiments. As shown in FIG. 5A, in some embodiments, the first holes 21a may be arranged in a staggered manner in the first region 21 (for example, the first holes 21a in the first row and the first holes 21a in the second row are not aligned with each other along the long axis direction D1 of the flat plate 20), but the present invention is not limited thereto. As shown in FIG. 5B, in other embodiments, the first holes 21a may also be arranged in alignment with each other in the first region 21 (for example, the first holes 21a in the first row and the first holes 21a in the second row are aligned with each other along the long axis direction D1 of the flat plate 20). Please refer to FIG. 5C and FIG. 5D. FIG. 5C is a schematic diagram (I) of the second region 31 of the wave plate 30 of the annular catalyst unit 100 that has not yet been bent into a wave shape according to some embodiments. FIG. 5D is a schematic diagram (II) of the second region 31 of the wave plate 30 of the annular catalyst unit 100 that has not yet been bent into a wave shape according to some embodiments. For the convenience of diagrammatic representation, FIG. 5C and FIG. 5D illustrate the configuration relationship of the second holes 31a of the wave plate 30 that has not yet been bent into a wave shape. As shown in FIG. 5C, similarly, in some embodiments, the second holes 31a can be arranged in a staggered manner in the second region 31 (for example, the second holes 31a of the first row and the second holes 31a of the second row are not aligned with each other along the long axis direction D1 of the wave plate 30), but it is not limited thereto. As shown in FIG. 5D , in some other embodiments, the second holes 31 a may also be arranged in alignment with each other in the second region 31 (eg, the second holes 31 a in the first row and the second holes 31 a in the second row are aligned with each other along the long axis direction D1 of the corrugated plate 30 ).

The first hole 21a and the second hole 31a are circular holes, but the present invention is not limited thereto. In some embodiments, the shape of the hole can also be other geometric shapes, and the shapes of the first hole 21a and the second hole 31a can also be different.

The ratio of the total area of the first holes 21a and the second holes 31a to the total area of the flat plate 20 and the corrugated plate 30 (hereinafter referred to as the opening ratio) is between about 30% and 60%. In one embodiment, the opening ratio is about 45%.

Please refer to Figures 6A to 6C. Figure 6A is a schematic diagram (I) showing the second region 31, the continuous region 32, and the solder region 33 of the wave plate 30 of the annular catalyst unit 100 that has not yet been bent into a wave shape. Figure 6B is a schematic diagram (II) showing the second region 31, the continuous region 32, and the solder region 33 of the wave plate 30 of the annular catalyst unit 100 that has not yet been bent into a wave shape. Figure 6C is a schematic diagram (III) showing the second region 31, the continuous region 32, and the solder region 33 of the wave plate 30 of the annular catalyst unit 100 that has not yet been bent into a wave shape. For the convenience of diagrammatic representation, FIG. 6A to FIG. 6C illustrate the configuration relationship between the second region 31, the continuous region 32, and the solder region 33 of the wave plate 30 that has not yet been bent into a wave shape. As shown in FIG. 6A to FIG. 6C, in some embodiments, the wave plate 30 has a solder region 33 (represented by dot-chain lines). The solder region 33 overlaps at least a portion of at least one of the second region 31 and the continuous region 32. In other words, in some embodiments, the solder region 33 overlaps at least a portion of the second region 31 (as shown in FIG. 6A), or overlaps at least a portion of the continuous region 32 (as shown in FIG. 6B), or overlaps at least a portion of the second region 31 and at least a portion of the continuous region 32 (as shown in FIG. 6C).

Please also refer to FIG. 7. FIG. 7 is a partial cross-sectional schematic diagram of the annular honeycomb structure H of the annular catalyst unit 100 according to some embodiments. For the convenience of explanation, FIG. 7 only shows the cross-sectional conditions of the first layer of wave plate 30 and the second layer of flat plate 20 in the annular honeycomb structure H. As shown in FIG. 7, in some embodiments, when viewed along the cross-section of the annular honeycomb structure H, the wave plate 30 has a wave cross-section, and the wave cross-section includes a plurality of wave crests 30a and a plurality of wave troughs 30b, and the wave crests 30a and the wave troughs 30b are arranged alternately along the long axis direction D1 of the wave plate 30 (i.e., along the circumferential direction of the annular honeycomb structure H). The solder T is disposed outside the wave crests 30a and the wave valleys 30b of the solder region 33. As shown in FIG7 , in the present embodiment, the outside refers to the portion of the wave crests 30a/wave valleys 30b of the wave plate 30 close to the adjacent flat plate 20. In addition, in some embodiments, the area ratio of the solder region 33 to the wave plate 30 is about 20% to about 67%.

Please refer to FIG. 6A again. In this embodiment, the solder area 33 overlaps at least a portion of the second area 31. In other words, in this embodiment, the solder area 33 is all on the second area 31, that is, the solder T will be applied to the second area 31 during the manufacturing process, so that the solder T is located in the solid part between the second holes 31a of the second area 31 (when the viscosity of the solder T is low, the solder T may also be located on the hole wall of the second hole 31a). In addition, in this embodiment, the area ratio of the solder area 33 to the wave plate 30 is about 40% to about 67%.

Please refer to FIG. 6B again. In this embodiment, the solder region 33 overlaps at least a portion of the continuous region 32. In other words, the solder region 33 is entirely on the continuous region 32, that is, the solder T will be applied on the continuous region 32 during the manufacturing process. In this embodiment, the area ratio of the solder region 33 to the wave plate 30 is about 20% to about 33%.

Please refer to FIG. 6C again. In this embodiment, the solder region 33 overlaps at least a portion of the second region 31 and at least a portion of the continuous region 32. In other words, in this embodiment, the solder region 33 is partially located on the continuous region 32 and partially located on the second region 31, that is, during the manufacturing process, the solder T will be applied on the continuous region 32 and the second region 31. In addition, in this embodiment, the area ratio of the solder region 33 to the wave plate 30 is about 21% to about 40%.

In addition, it should be noted that the second area 31 (indicated by a frame line) in FIG. 5C may also be a simple rectangle, and the diagram is only used to simply illustrate which area is the second area 31. However, it is not important whether the second area 31 is a polygon or a rectangle, as long as the opening rate meets the aforementioned numerical range. Similarly, the first area 21 (indicated by a frame line) in FIG. 5A may also be a simple rectangle, and the diagram is only used to simply illustrate which area is the first area 21. However, it is not important whether the first area 21 is a polygon or a rectangle, as long as the opening rate meets the aforementioned numerical range.

Please refer to Figures 8A and 8B and refer to Figures 3A to 3C again. Figure 8A shows a schematic diagram of a manufacturing method of a flat plate 20 and a corrugated plate 30 of an annular catalyst unit 100 according to some embodiments (I). Figure 8B shows a schematic diagram of a manufacturing method of a flat plate 20 and a corrugated plate 30 of an annular catalyst unit 100 according to some embodiments (II). The following diagrams briefly illustrate the manufacturing process of the flat plate 20 and the corrugated plate 30 of the annular catalyst unit 100 according to one or more embodiments. First, a hole 91 (as shown in Figure 8B) is processed on a planar continuous plate 90 (as shown in Figure 8A) by a punching machine (such as a punching machine). Next, a portion of the continuous plate 90 with the hole 91 (i.e., corresponding to the wave plate 30) is processed into a wave cross-section structure by a wave plate forming machine to form the wave plate 30, and the remaining portion of the continuous plate 90 with the hole 91 is not processed into a wave cross-section, that is, a flat plate 20 (as shown in FIG. 3A and FIG. 3B). Next, according to the above-mentioned embodiment, solder T is applied to the solder area 33 of the wave plate 30. In one embodiment, solder T is applied to both the front and back sides of the solder area 33. Afterwards, the flat plate 20 and the wave plate 30 are overlapped with each other with the center line C as the fold line (as shown in FIG. 3B and FIG. 3C).

Next, please refer to FIG. 9A, which shows a schematic diagram (I) of a manufacturing method of the annular catalyst unit 100 according to some embodiments. As shown in FIG. 9A, in some embodiments, the wave plate 30 is integrally connected to the flat plate 20 (in other words, in some embodiments, the wave plate 30 and the flat plate 20 are the same plate body), so that one end of the flat plate 20 and one end of the wave plate 30 are integrally connected (here, for the convenience of explanation, the holes on the flat plate 20 and the wave plate 30 are not shown in the figure), and the connection between the flat plate 20 and the wave plate 30 is then welded to the outer surface 14a of the second metal annular body 14 through solder T, but this is not limited to this; for example, in some embodiments, the connection between the flat plate 20 and the wave plate 30 can also be welded to the outer surface 14a of the second metal annular body 14 through spot welding. Afterwards, the flat plate 20 and the corrugated plate 30 are wound along the outer surface 14a of the second metal annular body 14 by a winding machine, thereby forming an annular honeycomb structure H on the outer surface 14a of the second metal annular body 14, and then the annular honeycomb structure H and the second metal annular body 14 are placed together in the first metal annular body 12 to form a semi-finished product. Finally, the semi-finished product is placed in a vacuum furnace for heating to melt the solder T so that the annular honeycomb structure H can be stably fixed between the first metal annular body 12 and the second metal annular body 14. In other embodiments, please refer to FIG. 9B, which shows a schematic diagram (II) of a manufacturing method of the annular catalyst unit 100 according to some embodiments. As shown in FIG. 9B, in other embodiments, the corrugated plate 30 and the flat plate 20 are different plates. Specifically, after the hole 91 is processed on the continuous plate 90, the continuous plate 90 with the hole 91 is cut, and the cut two plates are respectively made into the flat plate 20 and the corrugated plate 30 with a small section of the flat plate structure. Afterwards, the flat plate 20 and the corrugated plate 30 are stacked (as shown in FIG. 9B ) and a winding machine is used to wind the flat plate 20 and the corrugated plate 30 along the outer surface 14a of the second metal annular body 14, thereby forming an annular honeycomb structure H on the outer surface 14a of the second metal annular body 14, and then the annular honeycomb structure H and the second metal annular body 14 are placed together in the first metal annular body 12. In addition, in some embodiments, the first metal annular body 12 and the annular honeycomb structure H may not include solder T; in other words, in some embodiments, the first metal annular body 12 and the annular honeycomb structure H are not relatively fixed.

In some embodiments, the apertures of the first hole 21a in the first region 21 of the flat plate 20 and the second hole 31a in the second region 31 of the corrugated plate 30 may be different. For example, the first hole 21a may be larger and the second hole 31a may be smaller. Thus, for the embodiment where the solder region 33 overlaps the second region 31, since the second hole 31a is smaller, the solder T is more likely to be provided to the solid portion between the second holes 31a in the second region 31, thereby improving the bonding strength between the corrugated plate 30 and the flat plate 20.

In addition, in some embodiments, in addition to setting the solder T in the solder area 33 according to the aforementioned method during the manufacturing process, additional solder T may be set at one end of the corrugated plate 30 away from the flat plate 20, thereby further enhancing the structural strength of the outer portion of the annular honeycomb structure H.

In some embodiments, the flat plate 20 and the corrugated plate 30 are overlapped and wound together so that the annular honeycomb structure H includes 12 to 36 turns of the flat plate 20 and 12 to 36 turns of the corrugated plate 30 .

Thus, according to one or more embodiments, the solder area 33 of the annular catalyst unit 100 and the corrugated plate 30 have an appropriate area ratio, so that the annular honeycomb structure H formed by the corrugated plate 30 and the flat plate 20 can be stably welded between the first metal annular body 12 and the second metal annular body 14, so that the annular catalyst unit 100 has good mechanical strength. In addition, according to one or more embodiments, the flat plate 20 and the corrugated plate 30 in the annular honeycomb structure H of the annular catalyst unit 100 have an appropriate opening rate, which can make the exhaust gas stay in the annular catalyst unit 100 for a longer time, thereby increasing the turbulence effect, so that the annular catalyst unit 100 has a better conversion efficiency. In addition, due to the opening design of the flat plate 20 and the corrugated plate 30 of the annular honeycomb structure H, the catalyst converter as a whole also has better thermal uniformity.

100: annular catalyst unit 12: first metal annular body 14: second metal annular body 14a: outer surface 20: flat plate 21: first region 21a: first hole 22: continuous region 30: wave plate 30a: wave crest 30b: wave trough 31: second region 31a: second hole 32: continuous region 33: solder region 90: continuous plate 91: hole C: center line D1: long axis direction H: annular honeycomb structure T: solder

FIG. 1 is a three-dimensional schematic diagram of an annular catalyst unit according to some embodiments. FIG. 2 is a decomposed schematic diagram of an annular catalyst unit according to some embodiments. FIG. 3A is a three-dimensional schematic diagram of a flat plate and a wave plate of an annular catalyst unit according to some embodiments. FIG. 3B is a side view schematic diagram of an annular catalyst unit before the flat plate and the wave plate are stacked on each other according to some embodiments. FIG. 3C is a side view schematic diagram of an annular catalyst unit after the flat plate and the wave plate are stacked on each other according to some embodiments. FIG. 4 is a schematic diagram of a second region and a continuous region of a wave plate that has not yet been bent into a wave shape of an annular catalyst unit according to some embodiments. FIG. 5A is a schematic diagram of a first region of a flat plate of an annular catalyst unit according to some embodiments (I). FIG. 5B is a schematic diagram of a first region of a flat plate of an annular catalyst unit according to some embodiments (II). FIG. 5C is a schematic diagram of a second region of a wave plate of an annular catalyst unit that has not yet been bent into a wave shape according to some embodiments (I). FIG. 5D is a schematic diagram of a second region of a wave plate of an annular catalyst unit that has not yet been bent into a wave shape according to some embodiments (II). FIG. 6A is a schematic diagram of a second region, a continuous region, and a solder region of a wave plate of an annular catalyst unit that has not yet been bent into a wave shape according to some embodiments (I). FIG. 6B is a schematic diagram of the second region, the continuous region and the solder region of the wavy plate that has not been bent into a wavy shape according to some embodiments of the annular catalyst unit (II). FIG. 6C is a schematic diagram of the second region, the continuous region and the solder region of the wavy plate that has not been bent into a wavy shape according to some embodiments of the annular catalyst unit (III). FIG. 7 is a schematic diagram of a partial cross-section of the annular honeycomb structure of the annular catalyst unit according to some embodiments. FIG. 8A is a schematic diagram of a manufacturing method of a flat plate and a wavy plate of an annular catalyst unit (I). FIG. 8B is a schematic diagram of a manufacturing method of a flat plate and a wavy plate of an annular catalyst unit (II). FIG. 9A is a schematic diagram showing a method for manufacturing an annular catalyst unit according to some embodiments (I). FIG. 9B is a schematic diagram showing a method for manufacturing an annular catalyst unit according to some embodiments (II).

100: Annular catalyst unit

12: First metal ring body

14: Second metal ring body

H: Ring honeycomb structure

Claims (4)

A ring-shaped catalyst monomer, comprising: a first metal ring-shaped body; a second metal ring-shaped body, located in the first metal ring-shaped body, wherein the diameter of the second metal ring-shaped body is smaller than the diameter of the first metal ring-shaped body; an annular honeycomb structure, located between the first metal ring-shaped body and the second metal ring-shaped body, wherein the annular honeycomb structure comprises a flat plate and a corrugated plate, the flat plate and the corrugated plate are overlapped and wound with each other and accommodated in the first metal ring-shaped body; the flat plate has a first area, the first area has a plurality of first holes, and the diameter of each first hole is between 0.8 mm and 5 mm; and The corrugated plate has a corrugated cross section and includes a second region and a continuous region, the second region is connected to the continuous region, and the corrugated cross section includes a plurality of crests and a plurality of troughs; wherein one end of the flat plate and one end of the corrugated plate are connected to an outer surface of the second metal annular body; wherein the second region has a plurality of second holes, the aperture size of each of the second holes is between 0.8 mm and 5 mm, and the total area of the first holes and the second holes is between 35% and 45% relative to the total area of the flat plate and the corrugated plate; The wave plate has a solder area, which overlaps at least a portion of at least one of the second area and the continuous area, and there is solder outside the wave crests and the wave troughs of the solder area. The area ratio of the solder area to the wave plate is 20% to 67%. An annular catalyst unit as described in claim 1, wherein the overlapping portion is located in the second area, and the area ratio of the solder area to the corrugated plate is 40% to 67%. An annular catalyst unit as described in claim 1, wherein the overlapping portion is located in the continuous area, and the area ratio of the solder area to the corrugated plate is 20% to 33%. The annular catalyst unit as described in claim 1, wherein the overlapping portion is located in the second area and the continuous area, and the area ratio of the solder area to the corrugated plate is 21% to 40%.

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