Hollow quincunx catalyst particle configuration

Abstract

The utility model discloses a hollow quincunx catalyst particle structure which at least comprises four blade ellipses, two blade ellipses are horizontally arranged, and two blade ellipses are vertically arranged; the four blade ellipses are uniformly arranged at intervals and are tangent to a circumscribed circle; the central circle is concentric with the circumscribed circle and is arranged on the inner sides of the ellipses of the four blades; the number of the transition circles is twelve, every three transition circles form a group, each group comprises two small transition circles and a large transition circle, and each group of transition circles are arranged at the positions tangent to the ellipses and the center circles of the adjacent blades respectively; the outer contour line of the cross section of the catalyst particle is formed by a smooth curve formed by the outer arc lines of the four blade ellipses, the inner arc lines formed by the eight transition small circles, the ellipses of the adjacent blades and the corresponding transition large circles, and the outer arc lines formed by the four transition large circles and the transition small circles which are tangent in pairs; the center circle forms the inner contour line of the cross section of the catalyst particle. According to the utility model, on the premise of meeting the strength requirement of the catalyst, the granular bulk density is smaller, and the catalyst bed layer has higher void ratio.

Description

Technical Field

[0001] This utility model relates to catalysts used in the petrochemical field, and in particular to a hollow plum blossom-shaped catalyst particle configuration. Background Technology

[0002] The irregular shape of catalyst particles is a widely used technique in hydrogenation catalysts, primarily aimed at improving the effective factor of the catalyst particles and reducing the pressure drop in fixed-bed reactors. Researchers, through examining three irregularly shaped catalysts—ring-shaped, wheel-shaped, and honeycomb-shaped—concluded that the pressure drop in irregularly shaped particle beds is the result of multiple factors, with bed porosity having the greatest impact, while the influence of particle shape cannot be ignored. Furthermore, the shape of the support during molding also relates to important catalyst parameters such as the ease of support molding, catalyst packing density, and catalyst packing porosity, significantly affecting the bed pressure drop and catalyst activity.

[0003] The morphology of a catalyst significantly influences its strength, specific surface area, pore volume, pressure drop, and mass transfer efficiency. Specially designed hollow, plum-blossom-shaped catalyst particles possess high porosity and a large-pore structure, exhibiting superior metal removal and compatibility properties. This eliminates diffusion resistance during the adsorption and reaction of macromolecules on the catalyst surface, improving reaction efficiency, increasing the porosity between catalyst particles, effectively alleviating pressure drop issues, and ensuring long-term operation of the unit.

[0004] In the prior art, for example, Chinese patent CN202741152U discloses a hollow serrated catalyst support, which comprises a through hole, protrusions, and a cylinder; 3 to 5 arc-shaped solid protrusions are arranged in a serrated pattern around the outer periphery of the cylinder; the cylinder and protrusions are an integral structure; the through hole is axially located at the center of the cylinder; the diameter of the through hole is equal to one-third of the radius of the cross-section of the hollow serrated cylinder; the axial length of the support is equal to the diameter of the cross-section of the support. Although this type of catalyst particle can increase the lateral pressure bearing capacity and improve the lateral pressure strength, and has good rolling properties, the flow groove between adjacent blades of this type of hollow serrated catalyst is formed by tooth grooves, resulting in shallow grooves in the hollow serrated particles. The catalyst particles designed using this method have a high packing density and a low porosity in the catalyst bed. When processing heavier raw materials, the diffusion resistance of reactants in the grooves increases, the pore blockage phenomenon increases significantly, and the catalyst is prone to coking and deactivation, thereby reducing the utilization rate of catalyst particles. In addition, heavier components are prone to scale buildup, which causes catalyst particles to stick together and clump together, which can easily lead to an increase in bed pressure drop.

[0005] Therefore, there is an urgent need for a more optimized hollow plum blossom-shaped catalyst particle configuration, which can more effectively reduce the particle packing density and increase the porosity between catalyst particles while meeting the catalyst strength requirements. This can enhance the filtration and storage capacity for mechanical impurities, thereby effectively alleviating the pressure drop problem of the unit.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a hollow, plum blossom-shaped catalyst particle configuration that, while meeting the catalyst strength requirements, has a low particle packing density, a high porosity in the catalyst bed, enhances the filtration and storage capacity for mechanical impurities, optimizes material flow distribution, significantly alleviates the increase in catalyst bed pressure drop, effectively improves catalyst utilization, and fully utilizes catalyst activity.

[0008] To achieve the above objectives, this utility model provides a hollow plum blossom-shaped catalyst particle configuration, comprising at least: four elliptical blades, two arranged horizontally and two arranged vertically; the four elliptical blades are evenly spaced and each is tangent to an external circle; a central circle is concentric with the external circle and is located inside the four elliptical blades; twelve transition circles are arranged in groups of three, each group including two small transition circles and one large transition circle, each group of transition circles being located at a position tangent to the adjacent elliptical blade and the central circle; a smooth curve formed by the outer arc of the four elliptical blades, the inner arc of the eight small transition circles tangent to the adjacent elliptical blade and the corresponding large transition circle, and the outer arc of the four large transition circles and the two pairs of small transition circles forming the outer contour line of the catalyst particle's cross-section; and the central circle forming the inner contour line of the catalyst particle's cross-section.

[0009] Furthermore, in the above technical solution, let the radius of the circumscribed circle be R; the radius of the central circle be r1; the length of the major axis of the blade ellipse be D, and the length of the minor axis be d; the radius of the transition large circle be r2, and the radius of the transition small circle be r3. R is preferably 2.5 mm to 7.0 mm. r1 is preferably 1 / 4 to 1 / 3 of R. D preferably satisfies 4 / 5R ≥ D ≥ 2 / 3R. d is preferably 1 / 3 to 1 / 2 of D. The length of r2 is preferably less than the length of d.

[0010] Furthermore, in the above technical solution, the length of D can be from 1.5mm to 6.0mm. The length of d can be from 0.5mm to 3.0mm.

[0011] Furthermore, in the above technical solution, it is preferable to satisfy: r1>r2>r3.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1) The configuration design of this utility model, the catalyst particles with cross-sectional contour lines (the particles are composed of an internal solid carrier and surface active components), the catalyst configuration is centrally symmetrical, the configuration of four elliptical blades and twelve transition circles connected and the central circle is hollow, so that the catalyst has a small particle packing density, the catalyst bed has a high porosity, which can enhance the filtering and storage capacity of mechanical impurities, optimize the material distribution, greatly alleviate the rise of catalyst bed pressure drop, effectively improve the utilization rate of catalyst, and give full play to the activity of catalyst.

[0014] 2) The configuration of this utility model can maximize the overall strength of the particles. By arranging the four elliptical blades and twelve transition circles in groups of three at intervals, and by hollowing out the central circle, the specific surface area of ​​the catalyst particles can be effectively increased while ensuring the overall strength of the catalyst particles, thereby further improving the utilization rate of the catalyst and fully exerting the activity of the catalyst.

[0015] 3) This invention features a spacing between adjacent elliptical blades, meaning that adjacent elliptical blades are not tangent to each other and are smoothly connected by transition circles. This allows the hollow catalyst to have a large porosity and specific surface area, while also achieving a relatively open state between the inner arc of the small transition circle and the outer arc of the large transition circle. The relatively open transition arc and the outer arc of the blade ellipse constitute the smooth, constricted particle grooves of the catalyst, solving the problems of high particle packing density, low filtration and storage capacity for mechanical impurities, uneven raw material distribution leading to coking, and increased pressure drop in the catalyst bed in existing technologies.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of this utility model easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hollow plum blossom-shaped catalyst particle configuration of this utility model.

[0018] Explanation of key figure labels:

[0019] 1-Circumscribed circle; 2A-First blade ellipse, 2B-Second blade ellipse, 2C-Third blade ellipse, 2D-Fourth blade ellipse; 3A-First transition small circle, 3B-Second transition small circle, 3C-Third transition small circle, 3D-Fourth transition small circle, 3E-Fifth transition small circle, 3F-Sixth transition small circle, 3G-Seventh transition small circle, 3H-Eighth transition small circle; 4A-First transition large circle, 4B-Second transition large circle, 4C-Third transition large circle, 4D-Fourth transition large circle; 5-Central circle. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0021] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0022] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “upper,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0023] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0024] like Figure 1 As shown, this utility model provides a hollow plum blossom-shaped catalyst particle configuration, including: elliptical blades, a central circle, and a transition circle. The number of elliptical blades is four, i.e., arranged in a specific order... Figure 1The first blade ellipse 2A, the second blade ellipse 2B, the third blade ellipse 2C, and the fourth blade ellipse 2D are arranged clockwise, with the first blade ellipse 2A and the third blade ellipse 2C horizontally arranged (i.e., the major axis of the blade ellipse is in the horizontal direction), and the second blade ellipse 2B and the fourth blade ellipse 2D vertically arranged (i.e., the major axis of the blade ellipse is in the vertical direction). The four blade ellipses are evenly spaced and each is tangent to a circumscribed circle 1. The central circle 5 is concentric with the circumscribed circle 1 and is located inside the aforementioned four blade ellipses. There are twelve transition circles, arranged in groups of three. Each group consists of two small transition circles and one large transition circle. Each group of transition circles is positioned tangent to the adjacent blade ellipse and central circle. Specifically, the first small transition circle 3A, the second small transition circle 3B, and the first large transition circle 4A form one group, respectively positioned tangent to the first blade ellipse 2A, the second blade ellipse 2B, and the central circle 5; the third small transition circle 3C, the fourth small transition circle 3D, and the second large transition circle 4B form another group, respectively positioned tangent to the second blade ellipse 2B, the third blade ellipse 2C, and the central circle 5; the fifth small transition circle 3E, the sixth small transition circle 3F, and the third large transition circle 4C form another group, respectively positioned tangent to the third blade ellipse 2C, the fourth blade ellipse 2D, and the central circle 5; and the seventh small transition circle 3G, the eighth small transition circle 3H, and the fourth large transition circle 4D form another group, respectively positioned tangent to the fourth blade ellipse 2D, the first blade ellipse 2A, and the central circle 5. Furthermore, the two small transition circles in each group are tangent to the large transition circle within the same group. At this point, the hollow plum blossom-shaped catalyst particle configuration of this utility model is complete. The smooth curve formed by the outer arc of the four elliptical blades, the inner arc of the eight small transition circles tangent to the adjacent elliptical blades and the corresponding large transition circles, and the outer arc of the four large transition circles and the two small transition circles tangent to each other forms the outer contour line of the cross-section of the catalyst particle; the central circle 5 forms the inner contour line of the cross-section of the catalyst particle.

[0025] Catalyst particles with this type of cross-sectional profile (particles consisting of a solid internal support and active components on the surface) have a centrally symmetrical configuration. The configuration of four elliptical blades and twelve transition circles connected by a hollow central circle results in a low particle packing density and a high porosity in the catalyst bed. This enhances the filtration and storage capacity for mechanical impurities, optimizes the material flow distribution, significantly reduces the increase in catalyst bed pressure drop, effectively improves catalyst utilization, and fully utilizes the catalyst's activity.

[0026] Further as Figure 1 As shown, due to the central symmetry of the four elliptical blades, the overall configuration of the particle cross-section is... Figure 1With identical dimensions in both the vertical and horizontal directions, the particles exhibit maximum stability, maximizing their overall strength. The arrangement of four elliptical blades and twelve transition circles arranged in groups of three, along with a hollow center circle, effectively increases the specific surface area of ​​the catalyst particles while maintaining their overall strength. This further enhances catalyst utilization and maximizes their activity.

[0027] Further as Figure 1 As shown, in the particle cross-sectional configuration design, this invention sets the radius of the circumscribed circle 1 to R; the radius of the central circle 5 to r1; the major axis length of each of the four blade ellipses to D, and the minor axis length to d; the radius of the transition large circle to r2, and the radius of the transition small circle to r3. Further, preferably but not limitingly, the radius R of the circumscribed circle 1 can be 2.5 mm to 7.0 mm, the radius r1 of the central circle 5 is 1 / 4 to 1 / 3 of the radius R of the circumscribed circle 1, the major axis length of the blade ellipses is 4 / 5R ≥ D ≥ 2 / 3R, the minor axis length d of the blade ellipses is 1 / 3 to 1 / 2 of the major axis length D, and the radius r2 of the transition large circle is smaller than the minor axis length d of the blade ellipses. Specifically, the major axis length D of the blade ellipses can be 1.5 mm to 6.0 mm. The minor axis length d of the blade ellipses can be 0.5 mm to 3.0 mm. The length of the radius r3 of the transition small circle can be set to r1 > r2 > r3. Experiments and calculations show that this configuration design can balance the overall strength and specific surface area of ​​the catalyst particles.

[0028] This invention features a spacing between adjacent elliptical blades, ensuring that they are not tangent and are smoothly connected via transition circles (maintaining overall particle stability). This allows the hollow catalyst to have a large porosity and specific surface area, while also achieving a relatively open state between the inner arc of the transition circle and the outer arc of the transition circle. An excessively small central circle would result in a small central size of the catalyst support, leading to poor overall catalyst stability. The relatively open transition arc and the outer arc of the blade ellipse form smooth, constricted particle grooves, solving the problems of high particle packing density, low filtration and storage capacity for mechanical impurities, uneven raw material distribution leading to coking, and increased catalyst bed pressure drop in existing technologies. This not only effectively improves catalyst utilization but also fully utilizes catalyst activity.

[0029] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical applications, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. Any simple modifications, equivalent changes, and alterations made to the foregoing exemplary embodiments should fall within the protection scope of the present invention.

Claims

1. A hollow clover-shaped catalyst particle configuration, characterized in that, The application relates to a catalyst particle, which comprises: four blade ellipses, two of which are arranged horizontally and two of which are arranged vertically, the four blade ellipses being uniformly spaced and each being tangent to an outer tangent circle; a central circle which is concentric with the outer tangent circle and is arranged inside the four blade ellipses; twelve transition circles, three of which form a group, each group comprising two transition small circles and one transition large circle, each group of transition circles being arranged at a position tangent to an adjacent blade ellipse and the central circle; a smooth curve formed by the outer arc of the four blade ellipses, the inner arc of the eight transition small circles tangent to the adjacent blade ellipses and the corresponding transition large circles, the outer arc of the four transition large circles and the outer arc of the two transition small circles, the smooth curve forming the outer profile line of the cross section of the catalyst particle; and the central circle forming the inner profile line of the cross section of the catalyst particle.

2. Hollow Wye-shaped catalyst particle configuration according to claim 1, characterized in that The radius of the outer tangent circle is R; the radius of the central circle is r1; the length of the major axis of the blade ellipse is D and the length of the minor axis is d; the radius of the transition large circle is r2 and the radius of the transition small circle is r3.

3. Hollow Wye-shaped catalyst particle configuration according to claim 2, characterized in that The R is 2.5 mm to 7.0 mm.

4. Hollow Wye-shaped catalyst particle configuration according to claim 3, characterized in that The r1 is 1 / 4 to 1 / 3 of the R.

5. Hollow Wobbler catalyst particle configuration according to claim 3, characterized in that 4 / 5R >= D >= 2 / 3R.

6. Hollow Wye-shaped catalyst particle configuration according to claim 5, characterized in that The d is 1 / 3 to 1 / 2 of the D.

7. The hollow Wulff's star shaped catalyst particle configuration according to claim 2, characterized in that, The length of the r2 is less than the length of the d.

8. Hollow Wobbler catalyst particle configuration according to claim 5, characterized in that The length of the D is 1.5 mm to 6.0 mm.

9. Hollow Wobbler catalyst particle configuration according to claim 6, characterized in that The length of the d is 0.5 mm to 3.0 mm.

10. The hollow Wulff's star shaped catalyst particle configuration according to claim 2, characterized in that, The r1 > r2 > r3.

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