Four-impeller-shaped catalyst particle configuration

Abstract

The utility model discloses a four-impeller-shaped catalyst particle structure which at least comprises four blade ellipses, two blade ellipses, two blade ellipses, two blade ellipses, two blade ellipses, two blade ellipses, two blade ellipses and two blade ellipses, 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 eight transition ellipses are arranged at the positions, tangent to the adjacent blade ellipses and the center circle, of the blade ellipses in a pairwise mode correspondingly; and the outer arcs of the four blade ellipses, the outer arcs of the eight transition ellipses and a smooth curve formed by the central circle and the arcs tangent to the transition ellipses in pairs form a cross section contour line of the catalyst particle. On the premise of meeting the strength requirement of the catalyst, the catalyst bed has smaller particle stacking density and higher void ratio, and can further strengthen the filtering and storing capacity of mechanical impurities, optimize the material flow distribution, greatly relieve the rise of the pressure drop of the catalyst bed, effectively improve the utilization rate of the catalyst and reduce the production cost. The activity of the catalyst is fully exerted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the catalyst used in the field of petrochemical industry, especially to a four impeller shape catalyst particle configuration. BACKGROUND

[0002] In actual use, the solid catalyst must be processed into particles of certain shape and size to make the fluid mechanics performance of the catalyst meet the process requirements of the catalyst. The carrier can act as the skeleton of the active component in the supported catalyst and can interact with the active component to effectively improve the utilization rate of the active component and enhance the thermal stability and poison resistance of the catalyst.

[0003] The morphology of the catalyst affects the strength, specific surface area, pore volume, pressure drop and mass transfer efficiency of the catalyst to some extent and plays an important role in the petroleum refining process. At present, the catalyst morphology includes cylindrical strip shape, three-leaf shape, four-leaf shape, tooth ball shape and bird nest shape. In the field of petroleum refining, the four-leaf shape catalyst is a commonly used catalyst shape, and the cross section is usually symmetric four-leaf shape. Compared with the cylindrical strip shape catalyst, the four-leaf shape catalyst can increase the specific surface area of the catalyst, improve the reaction efficiency of the catalyst, increase the void fraction between the catalyst particles and effectively alleviate the pressure drop problem of the device.

[0004] In the prior art, for example, Chinese patent CN219424413U discloses a four-impeller-shaped catalyst particle configuration, as shown in Figure 1 , which comprises: four blade ellipses arranged horizontally and vertically; the centers of the four blade ellipses are connected to form a square; the four blade ellipses are uniformly spaced and tangent to an inscribed circle; a center circle concentric with the inscribed circle and arranged inside the four blade ellipses and concentric with the square; four transition ellipses arranged at the tangent positions of the adjacent blade ellipses and the center circle; and a smooth curve formed by the outer arc lines of the four blade ellipses and the inner arc lines of the four transition ellipses forms the cross-sectional profile line of the catalyst particle. Although this scheme has smaller particle packing density, higher void fraction of the catalyst bed, and can optimize the flow distribution under the premise of meeting the strength requirement, with the increasing difficulty of crude oil exploitation year by year, conventional crude oil resources have been significantly reduced, and inferior crude oil shows the characteristics of multiple types, difficult processing and increasing proportion. Metal and coke deposition is more likely to cause catalyst orifice blockage, and apparent activity decreases, thereby causing bed blockage. Therefore, the catalyst needs higher void fraction and higher impurity removal / capacity.

[0005] Therefore, there is an urgent need for a four-blade-shaped catalyst particle configuration that is more optimized than the prior art described above, thereby further reducing the bulk density of the particles, further increasing the porosity between the catalyst particles, and further strengthening the filtration and storage capacity of mechanical impurities, so as to effectively alleviate the problem of device pressure drop while meeting the strength requirements of the catalyst.

[0006] The information disclosed in this section is intended only to increase an understanding of the general background of the present application and should not be construed as recognizing or admitting that the information constitutes prior art that is already known to those of ordinary skill in the art. Content of the Invention

[0007] The present application aims to provide a four-blade-shaped catalyst particle configuration that has a smaller particle bulk density, a higher porosity of the catalyst bed, and a further strengthened filtration and storage capacity of mechanical impurities, thereby optimizing the flow distribution, substantially alleviating the rise of the catalyst bed pressure drop, effectively improving the utilization rate of the catalyst, and fully utilizing the activity of the catalyst.

[0008] To achieve the above-mentioned purpose, the present application provides a four-blade-shaped catalyst particle configuration, which at least comprises: four blade ellipses, two of which are arranged horizontally and two of which are arranged vertically; the four blade ellipses are uniformly spaced and each tangent to an outer tangent circle; a center circle concentric with the outer tangent circle and arranged inside the four blade ellipses; eight transition ellipses, each of which is arranged at a position tangent to an adjacent blade ellipse and the center circle; and a smooth curve formed by the outer arc of the four blade ellipses, the outer arc of the eight transition ellipses, the center circle, and the circular arc tangent to the two transition ellipses, which forms the cross-sectional profile of the catalyst particle.

[0009] Further, in the above technical solution, during the configuration process, the radius of the outer tangent circle is R, the radius of the center circle is r, the length of the major axis of the blade ellipse is A, and the length of the minor axis is B; and the length of the major axis of the transition ellipse is d.

[0010] Further, in the above technical solution, R can be 0.7mm to 5.0mm, r can be 1 / 4 to 2 / 3 of R, A can be greater than or equal to 2 / 3R, and d can be 1 / 3 to 3 / 4 of A. The length of d can be less than the length of B.

[0011] Further, in the above technical solution, the length of A can be 0.5mm to 3.0mm, and the length of d can be 0.2mm to 2.0mm.

[0012] Further, in the above technical solution, the angle formed by the tangent point of the two transition ellipses and the center circle and the center of the center circle is preferably 45°≤θ≤60°.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1) This utility model is based on Figure 1 The improvements shown are based on the existing configuration to address the characteristics of low-quality crude oil, which is characterized by its diverse types, difficulty in processing, and increasingly large proportion.

[0015] 2) This utility model is composed of a configuration consisting of four elliptical blades, eight transitional ellipses, and a central circle connected together, which is relative to... Figure 1 The existing configuration shown, due to the vertical arrangement of the transition ellipses in pairs, compared to the horizontal arrangement of a single transition ellipse, results in a catalyst with a smaller particle packing density and a higher porosity in the catalyst bed. This further enhances the filtration and storage capacity for mechanical impurities and optimizes the material flow distribution. Compared to... Figure 1 The existing technical configuration can significantly alleviate the increase in catalyst bed pressure drop, effectively improve catalyst utilization, and fully unleash catalyst activity.

[0016] 3) Relative to Figure 1 The existing configuration has four elliptical blades and four transition ellipses spaced apart (only the solid elliptical arc of one transition ellipse is used in the specific surface area calculation). This invention, by spaced four elliptical blades and eight transition ellipses (with two solid elliptical arcs of the transition ellipses and one arc of the central circle used in the specific surface area calculation), can more effectively increase the specific surface area of ​​the catalyst particles while ensuring the overall strength of the catalyst particles, thereby further improving the utilization rate of the catalyst and giving full play to the activity of the catalyst.

[0017] 4) This invention features a spacing between adjacent blade ellipses, meaning that adjacent blade ellipses are not tangent to each other and are smoothly connected by transition ellipses and a central circle. This ensures that the diameter of the central circle is not too small and also achieves a more open state between the outer arcs of the transition ellipses. The more open central circle arc, the outer arc of the transition ellipses, and the outer arc of the blade ellipses 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 catalyst bed pressure drop. This not only effectively improves the catalyst utilization rate but also fully utilizes the catalyst's activity.

[0018] 5) The configuration of this utility model reduces the probability and degree of catalyst particle blockage, and shortens the distance of inward diffusion from the outer surface of different positions of the particles; on the other hand, it can increase the bed porosity, ensure sufficient catalyst strength, increase the outer surface area, and reduce the equivalent diameter of the catalyst particles.

[0019] The above description is merely a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the specification, and in order to make the above and other purposes, technical features and advantages of the present application more easily understood, one or more preferred embodiments are listed below and are described in detail as follows with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of a four-blade-shaped catalyst particle configuration in the prior art.

[0021] Figure 2 is a schematic diagram of a four-blade-shaped catalyst particle configuration in the present application.

[0022] MAIN REFERENCE NUMERALS EXPLANATION Figure 2 ):

[0023] 1-Excircle; 2A-First blade ellipse, 2B-Second blade ellipse, 2C-Third blade ellipse, 2D-Fourth blade ellipse; 3A-First transition ellipse, 3B-Second transition ellipse, 3C-Third transition ellipse, 3D-Fourth transition ellipse, 3E-Fifth transition ellipse, 3F-Sixth transition ellipse, 3G-Seventh transition ellipse, 3H-Eighth transition ellipse; 4-Center circle. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0025] Unless otherwise explicitly stated, throughout the specification and claims, the term "comprise" or variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated element or group of elements but not the exclusion of other elements or groups of elements.

[0026] In this document, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", "on", "directly on", "indirectly on", and the like, can be used to describe one element's or feature's relationship to another element or feature as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0027] 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.

[0028] First, it should be noted that this utility model is... Figure 1 The improvements shown are based on the existing configuration and are designed to address the characteristics of low-quality crude oil, which is characterized by its variety, difficulty in processing, and increasing proportion. They also aim to solve the problem that metal and coke deposits are more likely to cause catalyst pore blockage and decreased apparent activity, thus leading to bed blockage. Therefore, while ensuring strength, the catalyst needs to have higher porosity and a higher ability to remove / dispose of impurities.

[0029] like Figure 2 As shown, this utility model provides a four-bladed wheel-shaped catalyst particle configuration, including: elliptical blades, a central circle, and a transitional ellipse. The number of elliptical blades is four, i.e., arranged in... Figure 2 The 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 horizontal), and the second blade ellipse 2B and the fourth blade ellipse 2D vertically arranged (i.e., the major axis of the blade ellipse is vertical). Furthermore, the four blade ellipses are evenly spaced and each is tangent to an external circle 1. The central circle 5 is concentric with the external circle 1 and is located inside the aforementioned four blade ellipses. Eight transition ellipses are arranged in pairs, each tangent to an adjacent blade ellipse and the central circle. Figure 1 Unlike existing technologies, this utility model does not employ... Figure 1 Instead of a configuration where a single transition ellipse is arranged laterally relative to the central circle, a design is adopted. Figure 2 The configuration involves two transition ellipses arranged vertically relative to the central circle. Specifically, the first transition ellipse 3A is tangent to the first blade ellipse 2A and the central circle 4; the second transition ellipse 3B is tangent to the second blade ellipse 2B and the central circle 4; the third transition ellipse 3C is tangent to the second blade ellipse 2B and the central circle 4; the fourth transition ellipse 3D is tangent to the third blade ellipse 2C and the central circle 4; the fifth transition ellipse 3E is tangent to the third blade ellipse 2C and the central circle 4; the sixth transition ellipse 3F is tangent to the fourth blade ellipse 2D and the central circle 4; the seventh transition ellipse 3G is tangent to the fourth blade ellipse 2D and the central circle 4; and the eighth transition ellipse 3H is tangent to the first blade ellipse 2A and the central circle 4. This completes the configuration of the four-bladed wheel-shaped catalyst particle of this invention, including the outer arcs of the four blade ellipses, the outer arcs of the eight transition ellipses, and the arcs where the central circle 4 is tangent to each pair of transition ellipses (i.e.,...). Figure 2The smooth curve (composed of the solid lines in the image) forms the cross-sectional profile of the catalyst particles.

[0030] Catalyst particles with this type of cross-sectional profile (the particles consist of an internal solid support and an active component on the surface) have a centrally symmetrical configuration, with a configuration consisting of four elliptical blades, eight transitional ellipses, and a central circle connecting to each other. Figure 1 The existing technical configuration, due to the vertical arrangement of the transition ellipses in pairs, results in a smaller particle packing density for the catalyst compared to the horizontal arrangement of a single transition ellipse (i.e., a wider area enclosed by the solid lines of the pair transition ellipses and the arc segment of the central circle). This leads to a higher porosity in the catalyst bed, further enhancing the filtration and storage capacity for mechanical impurities and optimizing the material flow distribution. Figure 1 The existing technical configuration can significantly alleviate the increase in catalyst bed pressure drop, effectively improve catalyst utilization, and fully unleash catalyst activity.

[0031] Further as Figure 2 As shown, because the four blades are arranged in a centrally symmetrical elliptical pattern, the overall configuration of the particle cross-section is... Figure 2 With the same dimensions in both the vertical and horizontal directions, the particles exhibit maximum stability, maximizing their overall strength. Relative to... Figure 1 The existing configuration uses an alternating arrangement of four blade ellipses and four transition ellipses (only the solid elliptical arc of one transition ellipse is used in the specific surface area calculation). This invention, by alternating an arrangement of four blade ellipses and eight transition ellipses (with two solid elliptical arcs of the transition ellipses and one arc of the central circle used in the specific surface area calculation), can more effectively increase the specific surface area of ​​the catalyst particles while ensuring the overall strength of the catalyst particles, thereby further improving the utilization rate of the catalyst and fully maximizing the activity of the catalyst.

[0032] Further as Figure 2As shown, when designing the particle cross-sectional configuration, the radius of the circumscribed circle 1 is R, the radius of the center circle 4 is r, the long axis length of the four blade ellipses is A, and the short axis length is B, and the long axis length of the eight transition ellipses is d. Further, preferably but not limitingly, the radius R of the circumscribed circle 1 can be 0.7mm to 5.0mm, the radius r of the center circle 4 is 1 / 4 to 2 / 3 of the radius R of the circumscribed circle 1, the long axis length A of the blade ellipse is greater than or equal to 2 / 3R, the long axis length d of the transition ellipse is 1 / 3 to 3 / 4 of the long axis length A of the blade ellipse, and the long axis length d of the transition ellipse is less than the short axis length B of the blade ellipse. Specifically, the long axis length A of the blade ellipse can be 0.5mm to 3.0mm. The long axis length d of the transition ellipse can be 0.2mm to 2.0mm. The included angle formed by the tangent point of the two transition ellipses and the center of the center circle 4 and the center of the center circle is 45°≤θ≤60°. Experiments and calculations show that such a configuration design can balance the overall strength and specific surface area of the catalyst particles.

[0033] The present utility model sets up a gap between adjacent blade ellipses, that is, adjacent blade ellipses are not tangent to each other and are connected by two transition ellipses and a center circle. In this way, the diameter size of the center circle can be ensured not to be too small, and a relatively more open state between the outer arcs of the two transition ellipses (i.e. Figure 2 the arc shown by the solid line in the figure) can be obtained. A too small size of the center circle will result in a small size of the middle part of the catalyst carrier, thus causing poor overall stability of the catalyst. The more open center circle arc, transition ellipse arc and blade ellipse arc form a smooth necking particle groove of the catalyst, which solves the problems of high particle packing density, low filtering and storage capacity for mechanical impurities, uneven distribution of raw material flow leading to easy coking and rising of catalyst bed pressure drop. Not only the utilization rate of the catalyst is effectively improved, but also the activity of the catalyst can be fully utilized.

[0034] The foregoing description of specific exemplary embodiments of the present utility model is for the purpose of explanation and illustration. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments are chosen and described in order to explain the principles of the present utility model and its practical application, thereby enabling others skilled in the art to implement and utilize the present utility model in various embodiments and various modifications as are suited to the particular use contemplated. Any simple modification, equivalent change, and modification of the above-described exemplary embodiments shall fall within the scope of protection of the present utility model.

Claims

1. A four-lobe shaped catalyst particle configuration, characterized by, Comprise: Four vane ellipses, two horizontally arranged and two vertically arranged; The four vane ellipses are uniformly spaced and each is tangent to an excircle; A central circle concentric with the excircle and disposed inside the four vane ellipses; Eight transition ellipses, each disposed between two adjacent vane ellipses and the central circle; The outer arcs of the four vane ellipses, the outer arcs of the eight transition ellipses, the central circle and the arcs tangent to the transition ellipses form a smooth curve which is the cross-sectional profile of the catalyst particle.

2. The four-lobe shaped catalyst particle configuration of claim 1, wherein, The radius of the excircle is R; the radius of the central circle is r; the length of the major axis of the vane ellipses is A and the length of the minor axis is B; the length of the major axis of the transition ellipses is d.

3. The four-lobe shaped catalyst particle configuration of claim 2, wherein, The R is 0.7mm to 5.0mm.

4. The four-lobe shaped catalyst particle configuration of claim 3, wherein, The r is 1 / 4 to 2 / 3 of the R.

5. The four-lobe shaped catalyst particle configuration of claim 3, wherein, The A is greater than or equal to 2 / 3 of the R.

6. The four-lobe shaped catalyst particle configuration of claim 5, wherein, The d is 1 / 3 to 3 / 4 of the A.

7. The four-lobe shaped catalyst particle configuration of claim 2, wherein, The length of the d is less than the length of the B.

8. The four-lobe shaped catalyst particle configuration of claim 5, wherein, The length of the A is 0.5mm to 3.0mm.

9. The four-lobe shaped catalyst particle configuration of claim 6, wherein, The length of the d is 0.2mm to 2.0mm.

10. The four-lobe shaped catalyst particle configuration of claim 1, wherein, The angle between the tangent point of the transition ellipses and the central circle and the center of the central circle is 45°≤θ≤60°.

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