A multi-layer conical cylindrical mixing element inducing radial cross flow and jet flow

Abstract

The application belongs to the technical field of chemical process intensification, and specifically discloses a multi-layer conical cylinder mixing element for inducing radial cross flow and jet flow. The mixing element comprises a conical cylinder set and a wall disturbance member. The conical cylinder set is composed of conical cylinders, fan blades and wing blades. Two adjacent conical cylinders are arranged in the same height and are reversely nested in a concentric manner. The conical cylinder surface is provided with jet holes, and the inward conical surface is bent to form a wing blade. The conical cylinder set is arranged in a staggered manner in opposite directions and is uniformly arranged along the axial direction and connected by rigid or flexible wall disturbance members. The application can cut, compress and expand the material flow in the pipe, generate various flow patterns such as spiral cross flow and jet flow, and realize the purpose of intensifying mixing and heat transfer through the coupling of various multi-scale flow patterns. The application has a wide application range, is flexible to set, low in energy consumption and high in practicability, and can achieve optimal effect according to the working condition arrangement parameters.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of chemical process intensification, and particularly relates to a multi-layer conical cylinder mixing element inducing radial cross flow and jet flow. BACKGROUND

[0002] In many industrial fields, such as chemical industry, pharmaceutical industry, food processing, etc., efficient mixing and heat transfer processes are crucial. The efficiency of mixing and heat transfer directly affects the quality of products, production cycle and cost. Static mixing elements can enhance the mixing and heat transfer efficiency and greatly avoid the occurrence of fouling by disturbing the fluid in the pipe, forming rotational flow and secondary flow, breaking the boundary layer and enhancing the intensity of turbulent flow. Therefore, process intensification equipment based on static mixing elements has become one of the important means for intensifying mixing and heat transfer in modern industry due to the advantages of convenient replacement, flexible setting and simple modification.

[0003] In typical chemical production processes represented by gas-gas mixing, flow resistance and mixing effect determine the production cost and efficiency. For example, the mixing process of hydrogen and natural gas is mainly completed in a static mixer. In the traditional tubular static mixing device, the mixing element represented by SMX has a high flow resistance while achieving strong mixing effect, and the mixing element represented by Kenics has a low flow resistance, but the chaotic mixing performance is reduced. In order to meet the green development requirements of chemical production processes, static mixing elements with strong mixing and low resistance effect are urgently needed to be developed. SUMMARY

[0004] The purpose of the present application is to provide a multi-layer conical cylinder mixing element inducing radial cross flow and jet flow, which can induce effective cross flow and jet flow of pseudo-mixed fluid under different fluid properties and operating conditions, and realize the purpose of intensifying chaotic mixing and heat transfer under low flow resistance conditions by coupling multi-scale different flow patterns, so as to solve the problems existing in the prior art.

[0005] The purpose of the present application is achieved by the following technical solutions.

[0006] A multi-layer conical cylinder mixing element inducing radial cross flow and jet flow is composed of a conical cylinder sleeve group and a wall surface disturbance element connection.

[0007] The conical cylinder sleeve groups are arranged in opposite directions and staggered, and are connected by a plurality of wall surface disturbance elements between the two conical cylinder sleeve groups.

[0008] Further, the conical cylinder sleeve groups are arranged in opposite directions and staggered with an included angle of 0°-60°, and are uniformly arranged along the axial direction. The distance between the conical cylinder sleeve groups is 0.5-4.0 times the pipe diameter.

[0009] Further, the conical cylinder sleeve set is composed of a plurality of equal-height concentric reverse nested conical cylinders and fan blades, wing blades.

[0010] The conical cylinder cone angle is 5°-80°, the conical cylinder and the conical cylinder are fixed through the fan blade, and the included angle between the fan blade and the center axis is 0°-60°.

[0011] The surface of the conical cylinder is uniformly provided with a plurality of jet holes in the circumferential direction, and the shape of the jet hole is any one or a combination of a plurality of peach-shaped holes, cross-shaped holes, diamond-shaped holes, fish scale-shaped holes, eight-character-shaped holes, hexagonal holes, long holes, square holes, circular holes, triangular holes and the like.

[0012] The inner surface of the conical cylinder is provided with a wing blade, and the included angle between the wing blade and the conical cylinder wall surface is 10°-80°. The shape of the wing blade is any one or a combination of a plurality of peach-shaped, cross-shaped, diamond-shaped, fish scale-shaped, eight-character-shaped, hexagonal, rectangular, square, circular, triangular and the like.

[0013] Further, the wall surface disturbance member connection can be a rigid disturbance member or a flexible disturbance member.

[0014] When the connecting member between the two conical cylinder sleeve sets is a rigid disturbance member, a twisted sheet with different notch shapes can be used. The notch is provided on the edge of the twisted sheet close to the pipe wall, the twisted sheet is divided into n parts at the notch and is bent to a certain angle, where 0<n≤20, the bending angle is-90°-90° along the normal direction of the notch edge, and the notch depth is 1 / 4-1 / 3 of the diameter of the twisted sheet.

[0015] When the connecting member between the two conical cylinder sleeve sets is a flexible connecting member, a flexible spiral thin tube can be used for connection, and the outer diameter of the flexible spiral thin tube is not more than 1 / 4 of the maximum cross-sectional diameter of the conical sleeve.

[0016] The above structure is adopted, and the following advantages are achieved:

[0017] The present application provides a multi-layer conical cylinder mixing element for inducing radial cross flow and jet flow. The inner conical cylinder of the mixing element is arranged in equal-height concentric reverse nesting, which can realize concentric multiple cutting, expansion and compression of the fluid in the pipe, generate multiple cross flows, realize high-frequency scouring and effective destruction of the boundary layer under the condition of short-range mixing path, and further realize strong mixing effect under low flow resistance.

[0018] The two conical cylinder sleeve sets are installed oppositely, the fan blades with different rotation directions change the flow direction of the fluid from the previous conical cylinder sleeve set, and the fluid is mixed again in the next conical cylinder sleeve set, so that the heat exchange and mixing of the core flow and the boundary layer area fluid are further realized quickly and sufficiently.

[0019] The inner surface of the conical cylinder is provided with fins, and the fluid passes through the fins to generate multi-scale longitudinal vortex pairs, thereby improving the mixing effect of the fluid cut by the conical cylinder and further enhancing the mixing ability of the fluid.

[0020] The surface of the conical cylinder is provided with a jet hole, and the fluid in the flow channel generates a jet through the jet hole, so that the jet fluid entrains the surrounding fluid, expands the local mixing area, and destroys the temperature boundary layer of the local fluid, thereby further improving the mixing efficiency and mass and heat transfer capacity.

[0021] The adjacent conical cylinder sleeve groups are connected by a plurality of wall disturbance elements, which can be rigidly connected by twisted sheets with notches, or flexibly connected by flexible spiral thin tubes. When the fluid passes through the gap between the two conical cylinder sleeve groups, it is continuously cut and stretched by the wall disturbance element, so that the cross flow and jet flow generated in the front section of the mixing element are coupled in this interval, and the chaotic mixing characteristics of the fluid in the cross section are strengthened. When using rigid wall disturbance elements, the notches near the edge of the twisted sheet further disturb and destroy the fluid boundary layer, thereby improving the mixing and heat and mass transfer efficiency of the fluid in the entire pipe. In addition, the wall disturbance element can fix the relative position of the adjacent conical cylinder sleeve groups. When using flexible wall disturbance elements, not only can the fluid disturbance be strengthened, but also the impact vibration brought by the fluid flow can be absorbed, prolonging the service life of the mixing element.

[0022] The present application has a wide range of applications. The proposed multi-layer conical cylinder mixing element for inducing radial cross flow and jet flow has high flexibility, low energy consumption, small fluid resistance, easy processing, simple installation, and strong practicality. The conical angle of the mixing element, the angle between the fan blades, the angle between the fin and the conical cylinder, the number and connection position of the conical cylinder and the fin, and other structural parameters can be reasonably arranged according to the actual application conditions to achieve the optimal energy consumption and mixing and heat transfer effect, and improve the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural diagram of a multi-layer conical cylinder mixing element for inducing radial cross flow and jet flow.

[0024] Figure 2 FIG. 4 is an axial view of the present application.

[0025] Figure 3 FIG. 5 is a schematic diagram of the conical cylinder in the present application.

[0026] Figure 4 FIG. 6 is a schematic diagram of the wall disturbance element in the present application.

[0027] The reference signs of the above drawings represent:

[0028] 1, conical cylinder; 2, fan blade; 3, fin; 4, jet hole; 5, wall disturbance element. DETAILED DESCRIPTION

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0030] Combination Figure 1 The multi-layer conical cylindrical mixing element for inducing radial crossflow and jet flow described in this example is composed of a conical cylinder 1, fan blades 2, winglets 3, and wall-mounted flow deflectors 5.

[0031] The distance between the conical cylinder sleeves in the multi-layer conical cylinder mixing element for inducing radial crossflow and jet is 0.5 to 4.0 times the pipe diameter.

[0032] Combination Figure 2 The conical cylindrical sleeve assembly includes 4 to 6 fan blades 2, which are evenly arranged circumferentially.

[0033] Combination Figure 2 , Figure 3 The thickness of the conical cylinder 1, fan blade 2, and wing blade 3 in the multi-layer conical cylinder hybrid structure for inducing radial crossflow and jet is 0.01 to 0.1 times the outer tube diameter. For example, when the tube diameter is 50 mm, the thickness of the conical cylinder 1, fan blade 2, and wing blade 3 is 0.5 mm to 5.0 mm, and the specific thickness depends on the selected materials and processing conditions.

[0034] Combination Figure 3 The conical cylinder is uniformly provided with jet holes 4 in the circumferential direction. The shape of the jet holes is any one or more combinations of the following shapes: peach-shaped hole, cross-shaped hole, rhomboid hole, fish-scale hole, figure-eight hole, hexagonal hole, elongated hole, square hole, round hole, triangular hole, etc.

[0035] Combination Figure 2 The angle between the fan blade 2 of the hybrid structure and the central axis is 0° to 60°, and the selected angle depends on the actual situation.

[0036] Combination Figure 2 The conical cylinder 1, which is composed of intersecting and combined components, has blades 3 arranged on its inner conical surface. The angle between the blades 3 and the conical cylinder 1 is 10° to 80°. The direction of the angle can be the same as or opposite to the direction of fluid flow. The shape of the blades 3 can be peach-shaped, figure-eight-shaped, herringbone-shaped, trapezoidal, elliptical, etc. The specific shape and combination can be selected according to the flow conditions inside the pipe and is not limited to the forms mentioned above.

[0037] Combination Figure 1 , Figure 4The two sets of conical cylinder sleeves are connected by wall disturbance members 5 which are arranged uniformly in the circumferential direction between the two sets of conical cylinder sleeves. The wall disturbance members can be selected from twisted sheets with notches or flexible spiral thin tubes. The number of the wall disturbance members is determined according to the specific conditions. When the twisted sheets with notches are selected, the twisted sheets are provided with notches near the side edges of the tube wall. The twisted sheets are divided into n parts at the notches and are bent to a certain angle, wherein 0 < n < 20. The bending angle is -90°90° along the normal direction of the opening edge. The notch depth is 1 / 41 / 3 of the diameter of the twisted sheet. A deeper notch can more effectively destroy the boundary layer of the fluid, but an excessively deep notch will affect the strength of the twisted sheet. The specific notch depth is determined according to the actual working conditions. When the flexible spiral thin tubes are selected, the types of the spiral thin tubes include, but are not limited to, compressed spiral thin tubes and butterfly-shaped spiral thin tubes. The maximum outer diameter of the spiral thin tube is not more than 1 / 4 of the maximum cross section of the conical sleeve. Other related parameters are determined according to the actual working conditions.

[0038] Example 1

[0039] The present application is described below in combination with specific data: The multi-layer conical cylinder mixing element for inducing radial cross flow and jet flow is composed of two sets of conical cylinder sleeves and six twisted sheets with notches. The two sets of conical cylinder sleeves are composed of four conical cylinders with different sizes which are staggered and nested from the upper bottom surface to the lower bottom surface. The heights of the four conical cylinders are 40 mm, the cone angles are 3.6°, the thicknesses of the cylinder walls are 1 mm, and the diameters of the lower bottom surfaces from large to small are 48 mm, 40 mm, 32 mm and 24 mm. Three fan blades are used to fix the conical cylinders, and the included angle between the fan blades is 60°. Six groups of peach-shaped fins are arranged in each cylinder, and the included angle between the fins and the cylinder is 35.5°. Peach-shaped jet holes are arranged at the connection between the cylinder and the fin. The structural distance between the two sets of conical cylinder sleeves is 30 mm, and the two sets of conical cylinder sleeves are arranged in opposite directions with a stagger angle of 30°. Six twisted sheets with notches are arranged in the circumferential direction between the two sets of conical cylinder sleeves. The length of the twisted sheet is 30 mm, the maximum diameter is 8 mm, and a 3 mm deep and 18 mm long notch is opened near the wall surface in the middle section of the twisted sheet. The twisted sheet is equally divided into three parts at the notch, and is bent by -15°, 0° and 15° along the normal direction of the edge of the twisted sheet.

[0040] Example 2

[0041] Example 2 presets a working condition of natural gas mixed with hydrogen. The structure of Example 2 is basically the same as that of Example 1, except that the heights of the four conical cylinders are 200 mm, the cone angles are 8.8°, the thicknesses of the cylinder walls are 8 mm, the diameters of the lower bottom surfaces from large to small are 600 mm, 500 mm, 400 mm and 300 mm, and the structural distance between the two sets of conical cylinder sleeves is 200 mm. Flexible spiral thin tubes are used to replace the twisted sheets to connect the two sets of conical cylinder sleeves.

[0042] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A multi-layer conical cylinder mixing element for inducing radial cross-flow and jet flow, which is composed of a conical cylinder sleeve group and wall turbulence elements connected together. The conical cylinder sleeve groups are arranged in an opposing and staggered manner, and several wall turbulence elements are connected between the two conical cylinder sleeve groups; The conical cylinder sleeve group consists of multiple conical cylinders nested concentrically and in opposite directions with the same height, as well as fan blades and wing plates; The conical angle of the conical cylinder is 5° to 80°, and the conical cylinders are fixed to each other through fan blades. The included angle between the fan blade and the central axis is 0° to 60°; Jet holes are uniformly arranged circumferentially on the surface of the conical cylinder. The shape of the jet holes is any one or a combination of the shapes of peach-shaped holes, cross-shaped holes, diamond-shaped holes, fish-scale-shaped holes, figure-eight-shaped holes, hexagonal holes, long holes, round holes, and triangular holes; Wing plates are arranged on the inner surface of the conical cylinder. The included angle between the wing plate and the conical cylinder wall surface is 10° to 80°. The shape of the wing plate is any one or a combination of the shapes of peach-shaped, cross-shaped, diamond-shaped, fish-scale-shaped, figure-eight-shaped, hexagonal, rectangular, circular, and triangular shapes.

2. The multi-layer conical cylindrical mixing element for inducing radial crossflow and jet flow according to claim 1, characterized in that: The opposing and staggered arrangement of the conical cylinder sleeve groups has a stagger angle of 0° to 60°, and is uniformly arranged along the axial direction. The distance between the conical cylinder sleeve groups is 0.5 to 4.0 times the pipe diameter.

3. The multi-layer conical cylindrical mixing element for inducing radial crossflow and jet flow according to claim 1, characterized in that: The wall turbulence element is a rigid turbulence element or a flexible turbulence element; When the connecting element between the two conical cylinder sleeve groups is a rigid turbulence element, a twisted sheet with different notch shapes can be used; a notch is provided at the edge of the twisted sheet close to the pipe wall. The twisted sheet is divided into n parts at the notch and bent to a certain angle, where 0 < n ≤ 20, and the bending angle is -90° to 90° along the normal direction of the notch edge. The notch depth is 1 / 4 to 1 / 3 of the diameter of the twisted sheet; When the connecting element between the two conical cylinder sleeve groups is a flexible connecting element, a flexible spiral thin tube can be used for connection, and the maximum outer diameter of the flexible spiral thin tube does not exceed 1 / 4 of the maximum cross-sectional diameter of the conical sleeve.

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