High-efficiency solid catalyst stirred suspension

Abstract

This utility model belongs to the technical field of stirring devices, specifically relating to a high-efficiency solid catalyst stirring suspender. The high-efficiency solid catalyst stirring suspender includes: a tank and a stirring shaft, and upper, middle, and lower impellers arranged sequentially from top to bottom on the stirring shaft. The upper and middle impellers are designed as three-bladed arc-shaped impellers, capable of generating strong axial flow and weak radial flow. The weak radial flow generated by the upper and middle layers can more promptly disperse the catalyst particles in the upper and middle parts to the surrounding areas, preventing excessive aggregation in the central region. Simultaneously, in conjunction with the axial flow, it ensures rapid and uniform distribution of catalyst particles within the main liquid phase region. The lower impeller is designed as a three-bladed arc-shaped impeller of equal width, possessing strong axial flow, capable of achieving an up-and-down tumbling effect on the particles to prevent sedimentation. The synergistic design of the multi-stage impellers results in a more rational flow field distribution, enabling uniform mixing of solid particles while improving stirring efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of stirring devices, specifically relating to a high-efficiency solid catalyst stirring suspender. Background Technology

[0002] In chemical production and laboratory settings, solid catalysts are frequently used. These catalysts need to be vigorously stirred and suspended in the reaction solution to meet the process requirements of reaction and formulation. In catalytic reactions, the density of most catalysts is greater than that of the solvent. For example, in biodiesel production, the significant density difference (Δρ≈2.58 g / cm³) between high-density CaO-ZnO / haloysite catalyst (3.5 g / cm³) and low-density palm oil (0.92 g / cm³) can easily lead to particle sedimentation and agglomeration, reducing catalytic efficiency.

[0003] In the catalyst mixing process, the stirring and suspension effect of the agitator is crucial. It can uniformly disperse the solid catalyst in the reaction liquid, prevent particle agglomeration or sedimentation, thereby improving the catalyst activity and utilization rate, and effectively enhancing the efficiency and selectivity of the chemical reaction. The hydrodynamic field generated by the agitator through its specific blade structure can effectively solve the problems of catalyst particle agglomeration and sedimentation. The flow field intensity generated by existing traditional agitators is singular (such as radial flow only / axial flow only / chaotic axial and radial flow fields, etc.) and cannot simultaneously meet the suspension dynamics requirements of particles, resulting in density stratification and particle size segregation. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency solid catalyst agitator to solve the technical problem that the flow field intensity generated by existing traditional agitators is singular and cannot simultaneously meet the suspension dynamics requirements of particles, resulting in density stratification and particle size segregation.

[0005] This application provides a high-efficiency solid catalyst stirred suspension device, comprising:

[0006] The tank body and the stirring shaft, and the upper, middle and lower blades arranged on the stirring shaft from top to bottom;

[0007] The upper and middle blades are three-bladed arc-shaped blades used to generate radial flow and downward axial flow; and

[0008] The lower blades are three-bladed, equally wide arc-shaped blades used to generate upward and downward axial flow.

[0009] In one embodiment of this application, the blades of the three-bladed arc-shaped impeller are curved downwards, and the width of the blade root end connected to the stirring shaft is greater than the width of the blade tip.

[0010] In one embodiment of this application, the acute angle between the blades of the three-bladed arc-shaped impeller and the axis of the stirring shaft is 45° to 75°.

[0011] In one embodiment of this application, the width of the root end and the width of the tip end of the three-bladed equal-width arc-shaped blade are equal.

[0012] The three-bladed, equally wide arc-shaped blades have a twist angle of 18° to 22° from the root end to the tip end.

[0013] In one embodiment of this application, the acute angle between the root end of the three equal-width arc-shaped blades and the axis of the stirring shaft is 65° to 75°.

[0014] In one embodiment of this application, the height and diameter of the tank's interior are H and D, respectively;

[0015] The lower blade is 0.1 to 0.2H above the bottom of the tank.

[0016] The height of the middle layer blades from the bottom of the tank is 0.45 to 0.55H;

[0017] The height of the upper blade from the bottom of the tank is 0.65 to 0.75H.

[0018] In one embodiment of this application, the blade width of the three-bladed arc-shaped blade is 0.03 to 0.05D, and the diameter is 0.4 to 0.5D;

[0019] The blade width of the three-bladed, equally wide arc-shaped propeller is 0.04–0.06D, and the diameter is 0.4–0.55D.

[0020] In one embodiment of this application, the inner wall of the tank is further provided with a plurality of radially extending baffles.

[0021] In one embodiment of this application, the height of the baffle is 0.8 to 0.95H and the width is 1 / 12 to 1 / 10D.

[0022] In one embodiment of this application, the middle blade is circumferentially deflected by 60° relative to the upper blade.

[0023] The beneficial effects of this utility model are:

[0024] Unlike existing technologies, this application provides a high-efficiency solid catalyst stirred suspension device, comprising: a tank and a stirring shaft, and upper, middle, and lower impellers arranged sequentially from top to bottom on the stirring shaft. The upper and middle impellers are designed as three-bladed arc-shaped blades, capable of generating strong axial flow and weak radial flow. The weak radial flow generated by the upper and middle layers can more promptly disperse the catalyst particles in the upper and middle parts to the surrounding areas, preventing excessive aggregation in the central region. Simultaneously, in conjunction with the axial flow, it ensures rapid and uniform distribution of catalyst particles within the main liquid phase region. The lower impeller is designed as a three-bladed arc-shaped blade of equal width, possessing strong axial flow, capable of achieving an up-and-down tumbling effect on the particles to prevent sedimentation. The synergistic design of the multi-stage impellers results in a more rational flow field distribution, enabling uniform mixing of solid particles while improving stirring efficiency.

[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 It is a traditional agitator in the suspension industry;

[0029] Figure 2 This is a schematic diagram of CFD flow field analysis for a traditional agitator;

[0030] Figure 3 This is a schematic diagram of a preferred embodiment of the high-efficiency solid catalyst stirred suspension device of this utility model;

[0031] Figure 4 This is a schematic diagram of the stirring shaft and impeller of a preferred embodiment of the present invention;

[0032] Figure 5 This is a top view of the upper and middle blades of a preferred embodiment of the present invention;

[0033] Figure 6This is a side view of a preferred embodiment of the three-bladed arc-shaped propeller blade of the present invention;

[0034] Figure 7 This is a side view of a preferred embodiment of the present invention, showing a three-bladed, equally wide arc-shaped blade.

[0035] Figure 8 The CFD simulation streamline diagram and velocity vector diagram of a high-efficiency solid catalyst stirred suspension device according to a preferred embodiment of this utility model are shown.

[0036] In the picture:

[0037] Tank body 1, baffle 11, stirring shaft 2, upper impeller 3, middle impeller 4, lower impeller 5. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] See Figure 1 This is a traditional agitator used in the suspension industry. The agitator features three layers of blades distributed axially. The upper and lower layers use turbine-type four-bladed oblique blades, while the middle layer uses turbine-type two-bladed oblique blades, responsible for mixing in the upper, middle, and lower regions respectively. Flow field analysis using CFD revealed (e.g.) Figure 2 As shown, the inherent geometry of this agitator has certain problems, resulting in weak flow field control capability of the three-layer impeller (failure to fully optimize flow field characteristics). Furthermore, a significant "dead zone" phenomenon appears in the lower part of tank 1, leading to severe particle settling and greatly affecting the suspension effect during the mixing process. CFD calculations show that the axial power of the upper impeller (3rd layer) is 32.1 kW, the middle impeller (4th layer) is 12.8 kW, and the lower impeller (5th layer) is 24.4 kW, resulting in a total axial power of 67.3 kW, which is relatively high. Therefore, there is an urgent need for an agitator that simultaneously possesses good axial and radial mixing performance and low energy consumption to achieve uniform suspension of solid particles throughout the reactor, thereby effectively improving the suspension effect and meeting the requirements of the suspension process.

[0040] Based on this, this application provides a high-efficiency solid catalyst stirred suspender, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0041] See Figure 3 and Figure 4 In one embodiment, the high-efficiency solid catalyst stirred suspension includes: a tank body 1 and a stirring shaft 2, and upper impeller 3, middle impeller 4 and lower impeller 5 arranged sequentially from top to bottom on the stirring shaft 2; the upper impeller 3 and the middle impeller 4 are three-bladed arc-shaped impellers used to generate radial flow and downward axial flow; and the lower impeller 5 is a three-bladed arc-shaped impeller of equal width used to generate upward and downward axial flow.

[0042] In this embodiment, by designing the upper impeller 3 and the middle impeller 4 as three-bladed arc-shaped impellers, a strong axial flow and a weak radial flow can be generated, promoting fluid circulation throughout the stirred tank. The lower impeller 5 is designed as a three-bladed arc-shaped impeller of equal width, which has a strong axial flow and can achieve an up-and-down tumbling effect on the particles to prevent particle settling. In addition, the radial flow generated by the upper and middle layers can more promptly disperse the catalyst particles in the upper and middle parts to the surrounding areas, avoiding excessive aggregation in the central region. At the same time, in conjunction with the axial flow, the catalyst particles are rapidly and uniformly distributed in the main liquid phase region. The synergistic design of the multi-stage impellers has a more reasonable flow field distribution, which enables the solid particles to be mixed uniformly while improving the stirring efficiency.

[0043] Optional, see Figure 3 The stirring shaft 2 extends vertically inside the tank 1. Let the height and diameter of the tank 1 be H and D, respectively; the stirring shaft can be a standard part with a diameter of 0.03 to 0.05D.

[0044] See Figure 4 and Figure 5 In this embodiment, to adapt to the catalyst mixing medium and operating conditions, both the upper impeller 3 and the middle impeller 4 adopt three-bladed arc-shaped blades. The blades of the three-bladed arc-shaped blades are curved downwards, and the width of the blade root end connected to the stirring shaft 2 is greater than the width of the blade tip. The acute angle formed by the blades of the three-bladed arc-shaped blades and the axis of the stirring shaft 2 is 45° to 75°, and can be, but is not limited to, 45°, 50°, 56°, 63°, 75°, etc. It can be adjusted as needed. See also Figure 5 The middle blade 4 is circumferentially deflected by 60° relative to the upper blade 3. Optionally, the three-bladed arc-shaped blade has a blade width of 0.03–0.05D and a diameter of 0.4–0.5D.

[0045] The three-bladed arc-shaped impeller primarily generates a downward axial flow (approximately 70-80%), while also producing a weak radial flow component (approximately 20-30%). As the impeller rotates, it propels the fluid downwards axially, creating a strong axial flow. This axial flow helps push the fluid from the rear to the front of the agitator, promoting circulation throughout the mixing tank. The radial flow generated by the impeller pushes the fluid outwards, increasing lateral mixing within the tank and ensuring thorough agitation and diffusion of the fluid in the radial direction.

[0046] In one application scenario, taking into account the characteristic that the density of solid catalyst is greater than that of solvent in a special medium, the radial flow generated in the upper and middle layers can more promptly disperse the catalyst particles in the upper and middle parts to the surrounding areas, avoiding excessive aggregation in the middle region. At the same time, in conjunction with the axial flow, the catalyst particles are rapidly and uniformly distributed in the main liquid phase region. Compared with the bottom radial flow, the mixing time can be shortened, which helps to accelerate the catalytic reaction process.

[0047] Further, see Figure 4 and Figure 7 The lower impeller 5 is a three-bladed, equally wide arc-shaped impeller, designed for strong axial flow to achieve a turbulent effect on particles and prevent sedimentation. Specifically, the root and tip widths of the three-bladed, equally wide arc-shaped impeller are equal; the root to tip angle of the three-bladed, equally wide arc-shaped impeller is 18°–22°. Preferably, the twist angle can be 20°. Further, the acute angle between the root of the three-bladed, equally wide arc-shaped impeller and the axis of the stirring shaft 2 is 65°–75°. The blade width of the three-bladed, equally wide arc-shaped impeller is 0.04–0.06D, and the diameter is 0.4–0.55D.

[0048] In this embodiment, the lower impeller 5 is positioned 0.1–0.2H above the tank bottom, preferably 0.15H, to ensure sufficient axial flow at the tank bottom and prevent dead zones in the mixing process. The middle impeller 4 is positioned 0.45–0.55H above the tank bottom, preferably 0.5H, to support the axial flow of the lower impeller. The upper impeller 3 is positioned 0.65–0.75H above the tank bottom, preferably 0.7H. The liquid level in the mixing tank is typically above 70% of the tank height; at this point, the upper impeller is close to the liquid surface, improving the mixing effect. Calculations show that the upper impeller is preferably positioned at 0.7H. When the liquid level is low, the upper impeller consumes less power, and the mixing effect is mainly provided by the middle and lower impellers. As the liquid level rises, the upper impeller participates in the work, forming axial and weak radial flows in the upper part. This layout avoids mutual interference between impellers, achieving efficient and energy-saving mixing at all liquid levels. This structural design aims to achieve uniform mixing throughout the mixing tank by creating different combinations of flow patterns through blades with varying numbers of layers.

[0049] Further, see Figure 3The inner wall of the tank body 1 is also provided with several radially extending baffles 11.

[0050] In this embodiment, in order to achieve uniform distribution of turbulent kinetic energy in the flow field inside the tank 1 and efficient mixing of solid particles, the baffle 11 is designed to eliminate tangential vortices and force fluid to turn, making axial-radial turbulence the dominant force, and converting ineffective energy consumption into effective mass transfer work.

[0051] Optionally, the height of the baffle 11 is 0.8 to 0.95H, and the width is 1 / 12 to 1 / 10D.

[0052] In addition, according to CFD simulation calculations, the upper shaft power of this embodiment is 9.12 kW, the middle shaft power is 6.55 kW, and the lower shaft power is 11.68 kW, with a total shaft power of 27.35 kW, which is 59.3% less than that of traditional blades.

[0053] See Figure 8 The high-efficiency solid catalyst stirred suspension in this embodiment achieves efficient matching of axial and radial flow fields through the coordinated optimization design of multi-stage blades, ensuring uniform mixing of the flow field throughout the entire stirred tank, eliminating the stirring dead zone, and reducing shaft power.

[0054] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0055] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.

Claims

1. A high-efficiency solid catalyst stirred suspension device, characterized in that, include: Tank body (1) and stirring shaft (2), and upper blade (3), middle blade (4) and lower blade (5) arranged sequentially from top to bottom on stirring shaft (2); The upper blade (3) and the middle blade (4) are three-bladed arc-shaped blades used to generate radial flow and downward axial flow; and The lower blade (5) is a three-bladed, equal-width arc-shaped blade used to generate upward and downward axial flow.

2. The high-efficiency solid catalyst stirred suspension device according to claim 1, characterized in that, The blades of the three-bladed arc-shaped impeller are curved downwards, and the width of the blade root end connected to the stirring shaft (2) is greater than the width of the blade tip.

3. The high-efficiency solid catalyst stirred suspension device according to claim 1, characterized in that, The acute angle between the blades of the three-bladed arc-shaped impeller and the axis of the stirring shaft (2) is 45° to 75°.

4. The high-efficiency solid catalyst stirred suspender according to claim 1, characterized in that, The width of the root end and the tip end of the three equal-width arc-shaped blades are equal. The three-bladed, equally wide arc-shaped blades have a twist angle of 18° to 22° from the root end to the tip end.

5. The high-efficiency solid catalyst stirred suspension device according to claim 4, characterized in that, The acute angle between the root end of the three equal-width arc-shaped blades and the axis of the stirring shaft (2) is 65° to 75°.

6. The high-efficiency solid catalyst stirred suspender according to claim 1, characterized in that, The height and diameter of the interior of the tank (1) are H and D, respectively; The lower blade (5) is 0.1 to 0.2H above the bottom of the tank; The height of the middle layer blade (4) from the bottom of the tank is 0.45 to 0.55H; The height of the upper blade (3) from the bottom of the tank is 0.65 to 0.75H.

7. The high-efficiency solid catalyst stirred suspension device according to claim 6, characterized in that, The blade width of the three-bladed arc-shaped propeller is 0.03–0.05D, and the diameter is 0.4–0.5D. The blade width of the three-bladed, equally wide arc-shaped propeller is 0.04–0.06D, and the diameter is 0.4–0.55D.

8. The high-efficiency solid catalyst stirred suspension device according to claim 1, characterized in that, The inner wall of the tank (1) is also provided with several radially extending baffles (11).

9. The high-efficiency solid catalyst stirred suspension device according to claim 8, characterized in that, The height of the baffle (11) is 0.8 to 0.95H and the width is 1 / 12 to 1 / 10D.

10. The high-efficiency solid catalyst stirred suspender according to claim 1, characterized in that, The middle blade (4) is circumferentially deflected by 60° relative to the upper blade (3).

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