A layered loading support structure for reforming catalyst

Abstract

The utility model relates to the field of industrial catalytic reaction equipment discloses a kind of layered filling support structure for reforming catalyst, including tank body, the top of tank body is fixedly connected with the reaction gas inflow pipe that penetrates tank body upper surface, the lower part of reaction gas inflow pipe is fixedly connected with shell, the inside of shell is provided with catalyst diffusion chamber, the inside of shell is provided with multiple passages, multiple passages are annularly equiangularly spaced and arranged in the inside of shell, the inside of tank body is provided with lower support assembly, the inside of tank body is provided with intermediate partition assembly between shell and lower support assembly. In the utility model, tank body is divided into upper layer filling area and lower layer filling area by setting intermediate partition, respectively filling pretreatment type catalyst and high-temperature reforming main catalyst, realizing the isolation partition of pretreatment catalyst and high-temperature reforming main catalyst, reducing catalyst replacement frequency, reduce operation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of industrial catalytic reaction equipment, and in particular to a layered packing support structure for reforming catalysts. Background Technology

[0002] In distributed hydrogen energy systems, methanol steam reforming for hydrogen production is widely used due to its readily available raw materials, moderate reaction temperature, and high potential for miniaturization. This process typically employs a fixed-bed reactor, where the catalyst is packed in granular form within the reaction tubes. Its performance directly affects hydrogen yield, purity, and system stability. These reactions are often highly exothermic or sensitive to temperature distribution, requiring catalysts with different functionalities at different reaction stages to optimize the entire process.

[0003] Existing reforming reactors typically employ a single catalyst bed structure. However, when the feed gas flows in at high speed from the top of the reactor, the airflow impact causes catalyst particles of different sizes and densities to collide and rub against each other, exacerbating particle wear and pulverization. The resulting catalyst powder can clog the gaps between the bed layers, leading to bed degradation, which shortens the continuous operating time of the unit and increases operation and maintenance costs. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a layered packing support structure for reforming catalysts, which aims to solve the problem in the prior art that "airflow impact causes catalyst particles of different sizes and densities to collide and rub against each other, aggravating particle wear and pulverization".

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a layered loading support structure for reforming catalysts, comprising a tank body, a reaction gas inflow pipe fixedly connected to the top of the tank body penetrating the upper surface of the tank body, a shell fixedly connected to the lower part of the reaction gas inflow pipe, a catalyst diffusion chamber disposed inside the shell body, multiple channels disposed inside the shell body, the multiple channels being arranged in a ring at equal angles inside the shell body, a lower support assembly disposed inside the tank body, and an intermediate partition assembly disposed inside the tank body between the shell body and the lower support assembly, the intermediate partition assembly comprising an intermediate partition plate, the intermediate partition plate being fixedly connected to the circumferential inner wall of the tank body and coaxially disposed with the tank body, a circular hole penetrating the upper and lower surfaces of the intermediate partition plate being opened on the surface of the intermediate partition plate, the intermediate partition plate dividing the tank body into an upper loading area and a lower loading area.

[0006] As a further description of the above technical solution: a purified air outlet pipe is fixedly connected to the bottom of the tank.

[0007] As a further description of the above technical solution: the reaction gas inflow pipe is connected to the catalyst diffusion chamber.

[0008] As a further description of the above technical solution: the catalyst diffusion chamber is connected to the outside of the shell through a channel.

[0009] As a further description of the above technical solution: the lower support assembly includes a support grid, which is fixedly connected to the circumferential inner wall of the tank, and a uniformly distributed perforated plate is fixedly connected to the bottom of the support grid.

[0010] As a further description of the above technical solution: the supporting grid is disposed below the bottom catalyst support layer, the uniformly distributed perforated plate is horizontally disposed in the tank and is made of high-temperature resistant stainless steel sintered plate or ceramic porous body, and the surface of the uniformly distributed perforated plate is distributed with guide holes arranged in a honeycomb pattern.

[0011] As a further description of the above technical solution: the interior of the tank is provided with a conical inclined surface.

[0012] As a further description of the above technical solution: the upper filling area is located above the middle partition plate inside the tank body, and the lower filling area is located below the middle partition plate inside the tank body.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the tank is divided into an upper filling zone and a lower filling zone by setting a middle partition, and pre-treated catalyst and high-temperature reforming main catalyst are filled respectively, so as to realize the isolation and partitioning of pre-treated catalyst and high-temperature reforming main catalyst, improve the overall reaction efficiency and selectivity, reduce the frequency of catalyst replacement, and reduce operation and maintenance costs.

[0014] 2. In this invention, by providing a catalyst diffusion chamber and multiple channels inside the shell, the raw material gas entering the reactor can be evenly distributed to each catalyst bed, reducing the occurrence of local overheating or overcooling and ensuring the consistency and stability of the reaction conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model; Figure 2 This is a three-dimensional cross-sectional view of the overall device in this utility model; Figure 3 This is a three-dimensional cross-sectional view of the shell and the intermediate partition plate in this utility model; Figure 4 This is a three-dimensional structural diagram of the middle partition and the lower support assembly in this utility model.

[0016] Legend: 1. Tank body; 12. Reactant gas inlet pipe; 13. Purified gas outlet pipe; 15. Conical inclined surface; 21. Intermediate partition assembly; 22. Intermediate partition plate; 23. Circular hole; 24. Upper filling zone; 25. Lower filling zone; 3. Shell; 31. Catalyst diffusion chamber; 32. Channel; 41. Lower support assembly; 42. Support grid; 43. Uniformly distributed perforated plate; 44. Guide hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 - Figure 3 This utility model provides an embodiment of a layered loading support structure for reforming catalysts, comprising a tank 1, which is a vertically arranged cylindrical high-temperature pressure-bearing container with a catalyst loading area in its inner cavity. A reaction gas inflow pipe 12 is fixedly connected to the top of the tank 1, penetrating the upper surface of the tank 1, and a purified gas outflow pipe 13 is fixedly connected to the bottom of the tank 1. A shell 3 is fixedly connected to the lower part of the reaction gas inflow pipe 12. A catalyst diffusion chamber 31 is provided inside the shell 3 to guide the reaction gas to uniformly enter the next layer of catalyst bed and achieve a smooth transition in the gas flow direction. The reaction gas inflow pipe 12 is connected to the catalyst diffusion chamber 31. A conical inclined surface 15 is provided inside the tank 1 to gather the reaction gas flow from top to bottom. Multiple channels 32 are provided inside the shell 3, which are arranged in a ring at equal angles inside the shell 3. The catalyst diffusion chamber 31 is connected to the outside of the shell 3 through the channels 32.

[0019] Reference Figure 2 - Figure 4 The tank body 1 is equipped with a lower support assembly 41 to optimize the bottom flow field and achieve uniform airflow and full reaction. The lower support assembly 41 includes a support grid 42, which is fixedly connected to the circumferential inner wall of the tank body 1. A uniformly distributed perforated plate 43 is fixedly connected to the bottom of the support grid 42. The support grid 42 is located below the bottom catalyst support layer and is used to support all catalyst layers and allow the purified gas to be discharged smoothly. The uniformly distributed perforated plate 43 is horizontally set inside the tank body 1 and is made of high-temperature resistant stainless steel sintered plate or ceramic porous body. The surface of the uniformly distributed perforated plate 43 is distributed with honeycomb-shaped guide holes 44 with a diameter of 2 to 5 mm and an opening rate of 30% to 60%, which are used to achieve uniform redistribution of gas.

[0020] Reference Figure 2 - Figure 4 The tank 1 has an intermediate partition 21 located between the shell 3 and the lower support assembly 41. This partition 21 is used to accommodate reforming catalyst particles with different activities or functions, so as to realize functional partitioning of the catalyst and prevent the mixing and contamination of different catalysts. The intermediate partition 21 includes an intermediate partition 22, which is fixedly connected to the circumferential inner wall of the tank 1 and is coaxially arranged with the tank 1. The surface of the intermediate partition 22 has a circular hole 23 that penetrates the upper and lower surfaces of the intermediate partition 22. The intermediate partition 22 divides the tank 1 into an upper filling area 24 and a lower filling area 25.

[0021] Reference Figure 2 The upper filling zone 24 is located above the middle partition 22 inside the tank 1 and is used to fill the pretreatment catalyst to remove sulfides and chlorides from the feed gas. The lower filling zone 25 is located below the middle partition 22 inside the tank 1 and is used to fill the high-temperature reforming main catalyst to catalyze the reaction of methanol with water vapor to generate a hydrogen-rich mixture.

[0022] Working principle: During use, the raw material gas formed by the mixture of methanol and water vapor enters the catalyst diffusion chamber 31 inside the shell 3 through the reaction gas inlet pipe 12. After initial buffering in the chamber, the gas is sprayed out tangentially or obliquely downward through the circumferentially distributed channels 32, forming a swirling or diffused airflow, which enters the upper filling zone 24 evenly. In the upper filling zone 24, the pre-treated catalyst deeply purifies the raw material gas, removing impurities such as sulfur and chlorine, and preventing them from entering the main reaction zone and causing permanent catalyst poisoning.

[0023] The purified gas passes through the round holes 23 on the intermediate partition 22 and enters the lower filling zone 25. Under the action of the high-temperature reforming main catalyst, a methanol-water vapor reforming reaction occurs, generating a mixed gas mainly composed of hydrogen. After the reaction is completed, the mixed gas continues to flow downward, passing through the support grid 42 and the uniformly distributed perforated plate 43 in sequence. The support grid 42 supports all catalyst layers to prevent collapse, and the uniformly distributed perforated plate 43 distributes the gas flow evenly, reducing local velocity differences and making the outlet gas flow stable and uniform. Finally, the gas converges along the conical inclined surface 15 at the bottom of the tank 1 and flows into the purified gas outlet pipe 13, which is then transported to the downstream PSA unit and other purification systems for hydrogen purification.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A layered packing support structure for reforming catalysts, comprising a tank (1), characterized in that: A reaction gas inflow pipe (12) penetrating the upper surface of the tank (1) is fixedly connected to the top of the tank (1). A shell (3) is fixedly connected to the lower part of the reaction gas inflow pipe (12). A catalyst diffusion chamber (31) is provided inside the shell (3). Multiple channels (32) are provided inside the shell (3). The multiple channels (32) are arranged in a ring at equal angles inside the shell (3). A lower support assembly (41) is provided inside the tank (1). The part is provided with an intermediate partition assembly (21) located between the shell (3) and the lower support assembly (41). The intermediate partition assembly (21) includes an intermediate partition plate (22). The intermediate partition plate (22) is fixedly connected to the circumferential inner wall of the tank (1) and is coaxially arranged with the tank (1). The surface of the intermediate partition plate (22) is provided with a circular hole (23) that penetrates the upper and lower surfaces of the intermediate partition plate (22). The intermediate partition plate (22) divides the tank (1) into an upper filling area (24) and a lower filling area (25).

2. The layered packing support structure for reforming catalyst according to claim 1, characterized in that: The bottom of the tank (1) is fixedly connected to a purification gas outlet pipe (13).

3. The layered packing support structure for reforming catalysts according to claim 1, characterized in that: The reaction gas inlet pipe (12) is connected to the catalyst diffusion chamber (31).

4. The layered packing support structure for reforming catalysts according to claim 1, characterized in that: The catalyst diffusion chamber (31) is connected to the outside of the shell (3) through the channel (32).

5. A layered packing support structure for a reforming catalyst according to claim 1, characterized in that: The lower support assembly (41) includes a support grid (42), which is fixedly connected to the circumferential inner wall of the tank (1), and a uniformly distributed perforated plate (43) is fixedly connected to the bottom of the support grid (42).

6. The layered packing support structure for reforming catalyst according to claim 5, characterized in that: The supporting grid (42) is located below the bottom catalyst support layer. The uniformly distributed perforated plate (43) is horizontally arranged inside the tank (1) and is made of high-temperature resistant stainless steel sintered plate or ceramic porous body. The surface of the uniformly distributed perforated plate (43) is distributed with honeycomb-shaped guide holes (44).

7. The layered packing support structure for reforming catalyst according to claim 1, characterized in that: The interior of the tank (1) is provided with a conical inclined surface (15).

8. The layered packing support structure for reforming catalyst according to claim 1, characterized in that: The upper filling area (24) is located above the middle partition (22) inside the tank (1), and the lower filling area (25) is located below the middle partition (22) inside the tank (1).

Images