Gas-solid countercurrent enhanced stripping device for catalyst regeneration

Abstract

The present application relates to the technical field of catalyst regeneration, in particular to a gas-solid countercurrent enhanced stripping device for catalyst regeneration, comprising: a mounting frame and an inclined plate assembly. The inclined plate assembly is arranged inside the mounting frame, used for guiding the flow of catalyst particles and capable of prolonging the contact time of catalyst particles with water vapor. Further, when the catalyst particles impact the inclined plate assembly under the action of gravity, the inclined plate assembly can absorb kinetic energy through its elastic deformation, converting rigid collision into cushioned contact. Therefore, on the one hand, the impact force of the catalyst particles on the inclined plate assembly is reduced, which not only slows down the wear of the catalyst particles themselves, but also avoids the abrasion of the inclined plate assembly; on the other hand, the slight vibration induced by elastic deformation can disturb the flow state of the catalyst particles, promoting them to spread evenly on the inclined plate assembly, thereby improving the contact efficiency between the catalyst particles and water vapor and further improving the stripping efficiency.

Description

Technical Field

[0001] This invention relates to the field of catalyst regeneration technology, and in particular to a gas-solid countercurrent enhanced stripping device for catalyst regeneration. Background Technology

[0002] Catalysts gradually deactivate during industrial reactions due to carbon buildup, poisoning, or sintering of active components, requiring regeneration to restore their catalytic activity. The regeneration process typically involves high-temperature combustion in an oxygen-containing atmosphere to remove carbon deposits and other sediments from the catalyst surface. The regenerated catalyst (hereinafter referred to as regenerator) must be returned to the reaction system for continued use. However, when the regenerator leaves the regenerator, it often carries a certain amount of regeneration flue gas (mainly nitrogen, oxygen, and small amounts of carbon dioxide) between its particles and within its pores. If this flue gas is returned to the reactor along with the regenerator, it will not only dilute the reactants and reduce the selectivity of the target product, but also increase the inert gas load on the reaction system, interfering with normal reaction conditions. Therefore, before the regenerator is recycled back to the reactor, the flue gas it carries must be effectively removed through stripping.

[0003] As a key device in the catalyst regeneration loop, the stripper's main function is to displace the flue gas entrained in the surface and internal pores of the catalyst particles through countercurrent contact with the stripping medium (usually superheated steam), and discharge it into the flue gas treatment system. This ensures that the regenerator entering the reactor has a low flue gas carrying capacity, thereby improving the stability of the reaction system and the economic efficiency of the equipment operation.

[0004] With the increasing demands for catalyst regeneration efficiency and long-term operation in industrial plants, higher requirements are being placed on the performance of strippers. Traditional strippers often employ baffle or packing structures to extend the contact time by increasing the gas-solid contact path. Among them, inclined plate strippers are widely used in catalyst regeneration processes due to their relatively simple structure, low manufacturing cost, and ability to improve gas-solid distribution to a certain extent. A typical inclined plate stripper uses multiple sets of inclined baffles welded alternately inside the tower, allowing catalyst particles to fall along the surface of the inclined plates under gravity, while water vapor flows from bottom to top, forming a gas-solid countercurrent contact between the inclined plates, thereby achieving desorption and replacement of flue gas. Existing inclined plates are usually made of metal sheets directly welded to the mounting frame, relying on the shielding and guiding effect of the inclined plates to increase the contact probability between water vapor and catalyst.

[0005] However, during the descent of catalyst particles within the stripper, they are prone to rigid impact friction with the rigid inclined plates. Simultaneously, frequent collisions occur between particles due to water vapor disturbance, leading to catalyst particle wear, breakage, and pulverization. This not only significantly reduces the catalyst's lifespan but also exacerbates the wear rate of the inclined plate surface. The catalyst powder generated from breakage easily adheres to the inner wall of the equipment and the gaps between the inclined plates, potentially causing blockages in the equipment channels and directly affecting the smooth flow of regenerator and stripping efficiency. Summary of the Invention

[0006] Therefore, it is necessary to provide a gas-solid countercurrent enhanced stripping device for catalyst regeneration to address the problem of increased wear and reduced stripping efficiency caused by the impact contact between the catalyst and the rigid inclined plate in the current stripper.

[0007] The above objectives are achieved through the following technical solutions: A gas-solid countercurrent enhanced stripping unit for catalyst regeneration includes: Mounting frame; the mounting frame is provided with an inclined plate assembly, which can guide the flow of catalyst particles; The inclined plate assembly has elastic deformation capability, which can absorb impact energy under the impact of catalyst particles.

[0008] Furthermore, the inclined plate assembly is arranged in multiple groups along the vertical direction, and the inclined plate assembly is arranged in multiple groups at uniform intervals along the horizontal direction.

[0009] Furthermore, along the vertical direction, adjacent inclined plate assemblies guide the catalyst particles in different directions.

[0010] Furthermore, each set of inclined plate assemblies includes multiple main boards, with adjacent main boards overlapping each other; the main boards are inclined and hinged to the mounting bracket; a first through hole is provided on the main board, and the first through hole penetrates the main board.

[0011] Furthermore, the first through hole is configured as a plurality of holes, which are evenly spaced on the motherboard.

[0012] Furthermore, elastic plates are provided on both sides of the main board along the width direction. The elastic plates are elastically connected to the main board and are used to withstand the impact of catalyst particles.

[0013] Furthermore, a second through hole is provided on the elastic plate, and the second through hole penetrates the elastic plate; the elastic plates on the adjacent main plate form a suction cavity, and a unidirectional sheet is provided on the elastic plate, which can control water vapor to pass unidirectionally through the suction cavity and the second through hole.

[0014] Furthermore, along the direction in which the catalyst particles flow on the main plate, the width of the main plate increases sequentially.

[0015] Furthermore, along the direction in which the catalyst particles flow on the main board, the tilt angle of the main board decreases sequentially.

[0016] Furthermore, a connecting plate is fixedly provided on the mounting bracket, and the connecting plate is used to fix the mounting bracket.

[0017] The beneficial effects of this invention are: This invention provides a gas-solid countercurrent enhanced stripping device for catalyst regeneration, comprising: a mounting frame and an inclined plate assembly. The inclined plate assembly is disposed inside the mounting frame. When catalyst particles fall onto the inclined plate assembly under gravity, the assembly guides the catalyst particles to flow obliquely, prolonging the contact time between the catalyst particles and water vapor. Furthermore, when the catalyst particles impact the inclined plate assembly under gravity, the assembly absorbs kinetic energy through its elastic deformation, transforming rigid collisions into buffered contact. Therefore, on the one hand, the impact force of the catalyst particles on the inclined plate assembly is reduced, mitigating wear on the catalyst particles themselves and preventing erosion of the inclined plate assembly; on the other hand, the micro-vibrations induced by elastic deformation can disturb the flow state of the catalyst particles, promoting their uniform spreading on the inclined plate assembly, thereby improving the contact efficiency between the catalyst particles and water vapor, and further enhancing the stripping efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a gas-solid countercurrent enhanced stripping device for catalyst regeneration provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a gas-solid countercurrent enhanced stripping device for catalyst regeneration provided in another embodiment of the present invention; Figure 3 for Figure 2 Axonometric drawing; Figure 4 for Figure 2 Schematic diagram of the mounting bracket; Figure 5 for Figure 3 Schematic diagram of the cross-section of the middle part of the structure; Figure 6 for Figure 5 A magnified view of a portion of point A in the middle; Figure 7 for Figure 3 A schematic diagram of the structure of the main board and the flexible board.

[0019] in: 101. Mounting bracket; 102. Connecting plate; 111. Slanted frame; 112. Limiting block; 200. Inclined plate assembly; 201. Main board; 202. First through hole; 203. Hinge post; 211. Elastic plate; 212. Suction chamber; 213. Unidirectional sheet; 214. Second through hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] The following reference Figures 1 to 7This invention describes a gas-solid countercurrent enhanced stripping device for catalyst regeneration provided in an embodiment of the present invention. The device includes a mounting frame 101, a connecting plate 102, and an inclined plate assembly 200. The connecting plate 102 is fixedly connected to the mounting frame 101. The mounting frame 101 is installed vertically and fixed inside the stripper by the connecting plate 102. The inclined plate assembly 200 is disposed inside the mounting frame 101. During operation, catalyst particles fall from the top of the stripper and, under gravity, fall onto the inclined plate assembly 200, which guides the catalyst particles to flow obliquely. Simultaneously, water vapor flows upwards and contacts the catalyst particles. Compared to traditional vertical free-falling, this forced-guided flow significantly extends the residence path and time of the catalyst particles within the stripper, effectively increasing the probability and uniformity of gas-solid countercurrent contact, thereby greatly improving stripping efficiency.

[0024] Furthermore, when catalyst particles impact the inclined plate assembly 200 under gravity, the inclined plate assembly 200 absorbs kinetic energy through its own elastic deformation, transforming the rigid collision into a buffered contact. This process reduces the impact force of the catalyst particles on the inclined plate assembly 200, thus mitigating the wear of the catalyst particles themselves and preventing erosion of the inclined plate assembly 200. On the other hand, the micro-vibrations caused by the elastic deformation can disturb the flow state of the catalyst particles, promoting their uniform spread on the inclined plate assembly 200, thereby improving the contact efficiency between the catalyst particles and water vapor, and further enhancing the stripping efficiency.

[0025] In one embodiment, the inclined plate assembly 200 is arranged in multiple layers along the vertical direction, and multiple sets are evenly distributed along the horizontal direction within each layer, forming an array-like distribution structure. This array-like distribution structure increases the contact area between the catalyst particles and water vapor during the flow process, improves the mass transfer efficiency and reaction uniformity of the gas-solid two-phase system, thereby significantly improving the overall stripping efficiency.

[0026] In one embodiment, adjacent inclined plate assemblies 200 have different guiding effects on the flow direction of catalyst particles along the vertical direction, so as to guide the particles to continuously change their movement direction during the layer-by-layer falling process, increase the path density of catalyst particles in the flow process, extend the flow path of catalyst particles in the steam section, increase the contact time between catalyst particles and steam, and further improve the stripping efficiency.

[0027] In one embodiment, each inclined plate assembly 200 includes multiple main plates 201 arranged side by side, with adjacent main plates 201 overlapping each other. An inclined frame 111 is fixedly mounted on the mounting bracket 101, and a limiting block 112 is fixedly mounted on the inclined frame 111. The limiting block 112 has a through-hole. Each main plate 201 has a hinge post 203 fixedly mounted at both ends, which passes through the hinge hole to achieve hinge connection between the main plate 201 and the mounting bracket 101. A first through-hole 202 is provided on each main plate 201, allowing water vapor to flow upwards through the first through-hole 202 and react with the catalyst particles. Figure 6 The up and down directions in the middle.

[0028] To facilitate the guided flow of catalyst particles, the main board 201 is inclined relative to the horizontal direction. For example, as Figure 2 As shown, each motherboard 201 located in the top layer of the mounting bracket 101 is tilted towards the right side of the mounting bracket 101; each motherboard 201 located in the middle layer of the mounting bracket 101 is tilted towards the front side of the mounting bracket 101; and each motherboard 201 located in the bottom layer of the mounting bracket 101 is tilted towards the left side of the mounting bracket 101. Figure 2 The catalyst particles move in both left-right and front-back directions, causing them to continuously change their trajectory as they fall layer by layer. This means the catalyst particles alternately turn to the right, front, and left, forming an approximately zigzag flow trajectory. This increases the path density of the catalyst particles during the flow process, extends the flow path of the catalyst particles in the steam section, increases the contact area with the steam, and further improves the stripping efficiency.

[0029] In one embodiment, the first through holes 202 are provided in multiple locations and are evenly distributed on the main board 201 to enhance the uniformity of contact between the catalyst particles and water vapor.

[0030] In one embodiment, elastic plates 211 are respectively provided on both sides of the main board 201 along its width direction. The elastic plates 211 are elastically connected to the main board 201 and are used to absorb kinetic energy by absorbing the slight deformation caused by the impact of catalyst particles. Both elastic plates 211 extend at an angle relative to the main board 201, and their angles are opposite. Figure 5 As shown, the elastic plate 211 at the bottom of the main board 201 extends obliquely towards the inclined frame 111, forming an opening towards the inclined frame 111 between the elastic plate 211 and the main board 201; the elastic plate 211 at the top of the main board 201 extends obliquely away from the inclined frame 111, forming an opening away from the inclined frame 111 between the elastic plate 211 and the main board 201. Along the flow direction of the catalyst particles on the main board 201, the elastic plate 211 at the bottom of the upper main board 201 abuts against the surface of the adjacent lower main board 201, i.e. Figure 5In the vertical direction, the elastic plate 211 at the top of the lower motherboard 201 abuts against the surface of the upper motherboard 201 to form an overlapping connection structure.

[0031] Specifically, when catalyst particles fall and impact the main plate 201, the elastic plate 211 deforms under stress, increasing the opening angle between it and the main plate 201. This causes adjacent main plates 201 to tend to move closer together, creating a buffering effect to absorb kinetic energy and transforming rigid collisions into buffered contact. This process reduces the impact force of catalyst particles on the main plate 201, mitigating wear on the catalyst particles themselves and preventing erosion of the inclined plate assembly 200. Furthermore, the micro-vibrations induced by elastic deformation can disturb the flow state of the catalyst particles, promoting their uniform spread on the main plate 201, thereby improving the contact efficiency between the catalyst particles and water vapor, and further enhancing the stripping efficiency.

[0032] In one embodiment, adjacent motherboards 201 are interlocked by elastic plates 211, meaning the bottom elastic plate 211 of the upper motherboard 201 abuts against the surface of the lower motherboard 201, and the top elastic plate 211 of the lower motherboard 201 abuts against the surface of the upper motherboard 201. Figure 5 The upper and lower, left and right directions of the plate and the main board 201 together form a suction cavity 212. Each elastic plate 211 has a one-way thin plate 213 on the side facing away from the corresponding inclined frame 111. The elastic plate 211 has a second through hole 214 for water vapor to pass through. Specifically, when the two elastic plates 211 constituting the suction cavity 212 rebound due to elastic force, causing the adjacent main boards 201 to move away from each other, the one-way thin plate 213 on the right side of the suction cavity opens, that is... Figure 5 In the left-right direction, the second through hole 214 at this location opens, drawing some water vapor that is close to the back of the main plate 201 into the suction chamber 212. During the process where catalyst particles impact the main plate 201, causing the two elastic plates 211 constituting the suction chamber 212 to deform and bring adjacent main plates 201 closer together, the unidirectional thin plate 213 located on the right side of the suction chamber opens, and the second through hole 214 at this location opens, ejecting water vapor located inside the suction chamber, which collides with the rising main water vapor flow. Therefore, this process not only actively disturbs the water vapor distribution, preventing water vapor stagnation in local areas, but also slows down the overall water vapor flow rate through airflow counter-current, prolonging the contact time between the catalyst particles and water vapor, thereby further improving the stripping efficiency.

[0033] In one embodiment, along the direction of catalyst particle flow on the main board 201, the width and weight of the main board 201 increase sequentially. Since the main board 201 is mounted via a hinge, its tilting posture is affected by gravity to some extent. The heavier lower main board 201 can maintain a stable tilt angle due to greater gravity, while simultaneously supporting the upper main board 201 it overlaps with. Figure 5 The vertical direction of the motherboard is used to resist the disturbance caused by particle impact, thereby ensuring that the motherboard 201 is always in the preset guiding posture.

[0034] In one embodiment, along the direction of catalyst particle flow on the main board 201, the tilt angle of the main board 201 decreases sequentially, meaning the lower main board 201 is less tilted than the upper one, and is closer to a horizontal state. Figure 5 The tangential force on the catalyst particles falling onto the lower main plate 201 is reduced, thus slowing down their descent and extending their residence time on the main plate 201. By controlling the tilt angle of each main plate 201, it is possible to effectively prevent catalyst particles from falling prematurely into the main plate 201 of the next layer of inclined plate assembly 200 due to excessively high flow rate and insufficient stripping; it also helps to balance the particle retention on each main plate 201, ensuring a relatively uniform residence time distribution of catalyst particles throughout the flow path, thereby ensuring sufficient contact time between the catalyst particles and water vapor, and further improving stripping efficiency.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A gas-solid countercurrent enhanced stripping device for catalyst regeneration, characterized in that, include: Mounting rack; The mounting frame is equipped with an inclined plate assembly, which can guide the flow of catalyst particles. The inclined plate assembly has elastic deformation capability, which can absorb impact energy under the impact of catalyst particles.

2. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 1, characterized in that, The inclined plate assembly is arranged in multiple groups along the vertical direction, and the inclined plate assembly is arranged in multiple groups at uniform intervals along the horizontal direction.

3. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 2, characterized in that, Along the vertical direction, adjacent inclined plate assemblies guide the catalyst particles in different directions.

4. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 3, characterized in that, Each set of inclined plate assemblies includes multiple main plates, with adjacent main plates overlapping each other; the main plates are inclined and hinged to the mounting bracket; a first through hole is provided on the main plate, and the first through hole penetrates the main plate.

5. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 4, characterized in that, The first through hole is configured as a plurality of holes, which are evenly spaced on the motherboard.

6. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 4, characterized in that, The main board is provided with elastic plates on both sides along its width direction. The elastic plates are elastically connected to the main board and are used to withstand the impact of catalyst particles.

7. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 6, characterized in that, The elastic plate has a second through hole that penetrates the elastic plate; the elastic plates on the adjacent main plate form a suction cavity, and a unidirectional sheet is provided on the elastic plate, which can control water vapor to pass through the suction cavity and the second through hole in one direction.

8. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 4, characterized in that, Along the direction in which the catalyst particles flow on the main plate, the width of the main plate increases sequentially.

9. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 4, characterized in that, Along the direction in which the catalyst particles flow on the main plate, the tilt angle of the main plate decreases sequentially.

10. The gas-solid countercurrent enhanced stripping device for catalyst regeneration according to claim 1, characterized in that, A connecting plate is fixedly installed on the mounting frame, and the connecting plate is used to fix the mounting frame.

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