Ammonia cracking catalyst carrying structure and microreactor
By adopting a plate-shaped carrier and cross-flow channel design in the ammonia cracking reactor, the problems of large size and uneven heat in traditional devices are solved, realizing a miniaturized and low-energy-consumption ammonia cracking reaction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN XIANHU LAB
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-22
AI Technical Summary
In traditional ammonia cracking reactors, the catalyst is mounted in a honeycomb or mesh cylinder, resulting in a large furnace volume, uneven internal heating, and increased reverse reactions, making it difficult to achieve miniaturization and low energy consumption.
Multiple sheet-like carriers are used, each with air passage holes and flow channels. The air passage holes are staggered, and the flow channels are interconnected. The carriers are stacked to form an ammonia cracking catalyst carrier structure. The catalyst is coated in the holes and channels, and the reaction gas comes into contact with the catalyst multiple times in the structure to increase the reaction area and uniformity.
This improved the contact time and heat transfer uniformity of the reactant gases, reduced the reverse reaction rate, and enabled the miniaturization and low energy consumption of the device.
Smart Images
Figure CN224265755U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of ammonia cracking reaction, and in particular to an ammonia cracking catalyst mounting structure and microreactor. Background Technology
[0002] Traditional ammonia cracking reactors are ammonia decomposition furnaces, which mainly consist of pipelines, cracking furnaces, heat exchangers, purifiers, and other systems. In traditional ammonia cracking units, the catalyst is mounted inside the cracking furnace in a honeycomb or mesh-like cylindrical structure, resulting in drawbacks such as large furnace volume, uneven internal heating, and increased reverse reaction rate. The key to the current development of ammonia cracking hydrogen production units towards miniaturization and low energy consumption is to improve the uniformity of heat transfer and reduce the reverse reaction rate while increasing the catalyst reaction interface area. Utility Model Content
[0003] The purpose of this invention is to provide an ammonia cracking catalyst mounting structure and microreactor to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.
[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:
[0005] This utility model provides an ammonia cracking catalyst mounting structure, including:
[0006] The carrier is provided in multiple ways, and the multiple carriers are stacked sequentially along a first direction. Each carrier has multiple air passages evenly distributed along the first direction. At least a portion of the air passages on two adjacent carriers are staggered in the first direction. At least one side of two adjacent carriers that are stacked together has multiple flow channels evenly distributed. The air passages on the corresponding carriers are located in the flow channels. The air passages on two adjacent carriers that are close to each other are connected through the flow channels. The air passages and the flow channels are respectively provided with ammonia cracking catalysts.
[0007] The beneficial effects of the ammonia cracking catalyst mounting structure of this invention are:
[0008] This invention features an ammonia cracking catalyst in both the vent hole and the flow channel. When the reacting gas flows through the ammonia cracking catalyst support structure in the first direction, a portion of the gas reacts with the ammonia cracking catalyst in the vent hole of the first support, while a portion does not. This unreacted gas then flows along the flow channel between two adjacent supports and reacts with the ammonia cracking catalyst in the flow channel. It then flows into the vent hole of the second support, where it reacts with the ammonia cracking catalyst. The remaining gas passes directly through the vent hole of the second support and reacts, and so on, until the reacting gas is completely reacted. This invention ensures that the reacting gas has sufficient time to react under the action of the ammonia cracking catalyst on the surface of the support while passing through it. It also ensures a certain gas flow rate, allowing the reacted gas to be discharged in time. Furthermore, it reduces the volume of the support structure and shortens the path of the reacting gas, thereby reducing the generation of reverse reactions.
[0009] As a further improvement to the above technical solution, multiple flow channels are provided on the two overlapping surfaces of two adjacent carriers. The flow channels on the two adjacent carriers are arranged in a cross pattern. The air passage of the carrier on the upstream side is connected to the air passage of the carrier on the downstream side through the flow channels on the two overlapping surfaces of the two adjacent carriers.
[0010] As a further improvement to the above technical solution, the carrier is a sheet-like structure.
[0011] As a further improvement to the above technical solution, all the air vents on two adjacent carriers are staggered in the first direction.
[0012] As a further improvement to the above technical solution, a plurality of the flow channels are provided on the overlapping surface of the carrier along the second direction and are arranged at intervals along the third direction, wherein the second direction, the third direction and the first direction are perpendicular to each other.
[0013] As a further improvement to the above technical solution, the depth of the flow channel is 0.1-0.5mm and the width is 0.5-1mm.
[0014] As a further improvement to the above technical solution, the flow channel is formed on the carrier by stamping, etching or machining.
[0015] As a further improvement to the above technical solution, both sides of the carrier are coated with the ammonia cracking catalyst.
[0016] As a further improvement to the above technical solution, the ammonia cracking catalyst is coated on the support by one or more methods such as spraying, deposition, and scraping.
[0017] In addition, this utility model also proposes a microreactor, including the aforementioned ammonia cracking catalyst mounting structure, and a shell with an inlet and an outlet, wherein a plurality of the mounting bodies are sequentially stacked and arranged inside the shell along a first direction.
[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0021] Figure 1 This is a schematic diagram of an embodiment of the ammonia cracking catalyst mounting structure provided by this utility model;
[0022] Figure 2 This is a schematic diagram of an embodiment of the carrier provided by this utility model;
[0023] Figure 3 This is a schematic diagram of the reaction gas flow in one embodiment of the three carriers provided by this utility model.
[0024] Icon labels:
[0025] Mounting body 100; air vent 110; flow channel 120;
[0026] First carrier 200;
[0027] Second carrier 300;
[0028] The third carrier is 400. Detailed Implementation
[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0030] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0031] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.
[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0033] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.
[0034] In traditional ammonia cracking units, the catalyst is mounted in a cylindrical cracking furnace with an internal honeycomb or mesh structure, resulting in drawbacks such as large furnace volume, uneven internal heating, and increased reverse reaction rate. Improving heat transfer uniformity and reducing the reverse reaction rate while simultaneously increasing the catalyst reaction interface area is crucial for the miniaturization and energy efficiency of ammonia cracking hydrogen production units. Therefore, this invention proposes an ammonia cracking catalyst mounting structure to address the problems of large furnace volume, uneven internal heating, and increased reverse reaction rate.
[0035] like Figure 1 As shown, the ammonia cracking catalyst mounting structure of this utility model includes: a plurality of mounts 100, which are stacked sequentially along a first direction.
[0036] In this embodiment, the carrier 100 has a sheet-like structure. To reduce volume and cost, the carrier 100 can be as thin as 0.1 mm. The ultra-thin carrier 100 can reduce the size of the carrier structure and reduce the path of the reactant gas, thereby reducing the generation of reverse reaction.
[0037] Among them, such as Figure 2As shown, the carrier 100 is evenly distributed with a plurality of air passages 110 that are arranged through the first direction to increase the gas flow during the pyrolysis reaction. It can be understood that the air passages 110 penetrate through both sides of the carrier 100, and at least a portion of the air passages 110 on two adjacent carriers 100 are staggered in the first direction. In the assembly of the carrier structure in this embodiment, in order to ensure that the gas has sufficient reaction time inside the carrier 100, the air passages 110 do not completely overlap, but are staggered at a certain angle, preferably 0-45°.
[0038] In this invention, at least one side of two adjacent carriers 100 are evenly distributed with multiple flow channels 120. The corresponding air passages 110 on the carrier 100 are provided in the flow channels 120. The air passages 110 on two adjacent carriers 100 that are close to each other are connected through the flow channels 120. After the reaction gas passes through the air passage 110 on the upstream side, it will be diverted along the flow channels 120 to the air passage 110 on the next carrier 100 to realize the gas deflection path.
[0039] Ammonia cracking catalysts are provided on the inner walls of the air passage 110 and the flow channel 120, respectively. Ammonia cracking catalysts are generally commercial catalysts such as ruthenium-based and nickel-based catalysts.
[0040] In use, when the reactant gas flows through the ammonia cracking catalyst support structure in the first direction, as the reactant gas passes through the gas passage 110 on the first support 100, a portion of the gas comes into contact with the ammonia cracking catalyst within the gas passage 110 and participates in the reaction. A portion of the gas does not come into contact with the ammonia cracking catalyst. This unreacted gas then flows through the gas passage 110 on the first support 100, and a portion of the reactant gas flows along the flow channel 120 between two adjacent supports 100, coming into contact with the ammonia cracking catalyst within the flow channel 120 and participating in the reaction. Afterward, it flows into the second support 100. The gas passes through the pores 110 on the second carrier 100, and the ammonia cracking catalyst inside the pores 110 participates in the reaction. Another part passes directly through the pores 110 on the second carrier 100 and participates in the reaction. This process continues until the reacting gas is completely reacted. This invention can ensure that the reacting gas has sufficient time to react under the action of the ammonia cracking catalyst on the surface of the carrier 100 when passing through the carrier 100, and can also ensure a certain gas flow rate so that the reacted gas can be discharged in time. At the same time, it can reduce the volume of the carrier structure and reduce the path of the reacting gas, thereby reducing the generation of reverse reaction.
[0041] Furthermore, in order to further increase the gas flow rate and increase the contact area of the reaction, this embodiment provides multiple flow channel grooves 120 on both sides of the two adjacent carriers 100 that overlap each other. It can be understood that multiple flow channel grooves 120 are provided on both the front and back sides of the carrier 100.
[0042] Furthermore, the flow channels 120 on two adjacent carriers 100 are arranged in a cross pattern. The air passage 110 of the upstream carrier 100 is connected to the air passage 110 of the downstream carrier 100 through the flow channels 120 on the two overlapping surfaces of the two adjacent carriers 100. After the reaction gas passes through the air passage 110 on the upstream side, a portion of it will flow along the flow channel 120 on the back of the first carrier 100 and also along the flow channel 120 on the front of the second carrier 100. That is, after the reaction gas passes through the air passage 110 on the upstream side, it can achieve four-way diversion and flow to at least four air passages 110 on the second carrier 100 respectively.
[0043] In some embodiments, all the vent holes 110 on two adjacent mounts 100 are staggered in the first direction. The reaction gas passes through one vent hole 110 on the upstream side, the flow channel groove 120 on the back of the first mount 100 and the flow channel groove 120 on the front of the second mount 100 in sequence, and the four vent holes 110 on the downstream side, ensuring that the gas has sufficient reaction time inside the mount structure.
[0044] Among them, such as Figure 2 As shown, in each mount 100, a plurality of flow channels 120 are provided extending along the second direction on the overlapping surface of the mount 100 and are arranged at intervals along the third direction, with the second direction, the third direction and the first direction being perpendicular to each other.
[0045] In this embodiment, the depth of the flow channel 120 is 0.1-0.5 mm and the width is 0.5-1 mm.
[0046] In this embodiment, the flow channel 120 is formed on the carrier 100 by stamping, etching or machining.
[0047] In some other embodiments, both sides of the carrier 100 are coated with an ammonia cracking catalyst, and the reaction gas can participate in the reaction during both the inlet and outlet phases.
[0048] The ammonia cracking catalyst is coated on the carrier 100 by one or more methods, such as spraying, deposition, or scraping.
[0049] like Figure 3 As shown, this embodiment uses three carriers 100 as a unit to describe the flow of the reaction gas. The three carriers 100 are a first carrier 200, a second carrier 300 and a third carrier 400 stacked in sequence.
[0050] The reactant gas enters through the vent 110 of the first carrier 200. At this time, part of the gas moves along the flow channel 120 on the back of the first carrier 200, another part directly passes through the vent 110 of the second carrier 300, and another part moves along the flow channel 120 on the front of the second carrier 300. The gas then passes through at least four vents 110 on the periphery of the second carrier 300. At this time, part of the gas moves along the flow channel 120 on the back of the second carrier 300 and the front of the third carrier 400. The gas then passes through multiple vents 110 on the periphery of the third carrier 400, and another part directly passes through the vents 110 of the third carrier 400. This process continues until the reactant gas has completely reacted.
[0051] In addition, this utility model also proposes a microreactor, including the above-mentioned ammonia cracking catalyst support structure, and also includes a shell with an air inlet and an air outlet, with multiple supports 100 stacked sequentially in the shell along a first direction.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0053] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A structure for supporting an ammonia cracking catalyst, characterized in that, include: The carrier is provided in multiple ways, and the multiple carriers are stacked sequentially along a first direction. Each carrier has a plurality of air passages that are evenly distributed along the first direction. At least a portion of the air passages on two adjacent carriers are staggered in the first direction. At least one side of two adjacent carriers that are stacked together has a plurality of flow channel grooves evenly distributed. The air passages on the corresponding carriers are located in the flow channel grooves. The air passages on two adjacent carriers that are close to each other are connected through the flow channel grooves. The air passages and the flow channel grooves are respectively provided with ammonia cracking catalysts.
2. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: Each of the two overlapping surfaces of two adjacent carriers is provided with a plurality of flow channel grooves. The flow channel grooves on the two adjacent carriers are arranged in a cross pattern. The air passage hole of the carrier on the upstream side is connected to the air passage hole of the carrier on the downstream side through the flow channel grooves on the two overlapping surfaces of the two adjacent carriers.
3. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: The carrier has a sheet-like structure.
4. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: All the air vents on two adjacent mounts are offset in the first direction.
5. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: The plurality of flow channels extend along a second direction on the overlapping surface of the carrier and are arranged at intervals along a third direction, wherein the second direction, the third direction and the first direction are perpendicular to each other.
6. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: The depth of the flow channel is 0.1-0.5 mm and the width is 0.5-1 mm.
7. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: The flow channel is formed on the carrier by stamping, etching or machining.
8. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: Both sides of the carrier are coated with the ammonia cracking catalyst.
9. The ammonia cracking catalyst mounting structure according to claim 1, characterized in that: The ammonia cracking catalyst is applied to the carrier by one or more methods, such as spraying, deposition, or scraping.
10. A microreactor, characterized in that: The ammonia cracking catalyst mounting structure as described in any one of claims 1 to 9 further includes a housing with an inlet and an outlet, wherein a plurality of the mounting bodies are sequentially stacked and disposed within the housing along a first direction.