Fishtail bionic static mixer for strengthening gas-liquid oxidation reaction

Abstract

The invention discloses a fishtail bionic static mixer for strengthening gas-liquid oxidation reaction, and relates to the technical field of chemical process strengthening. The static mixer comprises a reinforcing pipe (1), a fishtail bionic static mixing element (2), a connecting piece (3) and a fixing piece (4). The static mixing element is mainly applied to gas-liquid continuous flow oxidation reaction, and the bionic fishtail shape design of the static mixing element strengthens fluid full mixing by inducing hairpin vortex on the premise of not remarkably increasing energy consumption. The middle ribs and the surface drilling structure are used for shearing and stretching fluid, so that multi-scale flow pattern coupling enhanced bubble group breaking is realized, bubbles in continuous phase liquid are promoted to be uniformly distributed, the gas-liquid interface area is remarkably increased, the reaction time is shortened, and the oxidation reaction efficiency is improved. Meanwhile, the mixing element is simple in structure, free of mechanical parts, energy-saving, efficient, not prone to scaling and capable of stably running for a long time. The technology is particularly suitable for the strong oxidation reaction process in the industries of chemical industry, petrochemical industry, pharmacy and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical process intensification, and in particular relates to a fishtail bionic static mixer for intensifying gas-liquid oxidation reaction. Background Art

[0002] Pyrazole fungicide is a broad-spectrum fungicide widely used in agriculture to control fungal diseases. Its chemical structure contains pyrazole rings and ether groups, which can effectively inhibit the growth of various pathogens and improve the yield and quality of crops. Traditional pyrazole synthesis methods mostly rely on complex reactor equipment, and the material transfer and mixing effects during the reaction process often limit the reaction rate and product yield. Mixers in the prior art often rely on mechanical stirring, which may result in high energy consumption, uneven mixing, and long reaction time, affecting the quality of the product.

[0003] As a continuous flow reaction intensification equipment, static mixers are widely used in chemical, pharmaceutical, food and other fields due to their excellent fluid dynamics performance. Static mixers can efficiently and evenly mix different substances through mixing elements, effectively increase the reaction rate, optimize the reaction conditions, and thus improve the quality and yield of the product. Compared with traditional reactors, they are cheaper and have higher reaction efficiency.

[0004] The present invention aims at the performance optimization problem existing in the existing static mixer, and proposes a novel static mixing element structure design method based on the bionic strategy. By changing the key parameters such as the geometric structure, angle and arrangement of the mixing element, the fluid mixing efficiency and reaction rate of the mixer can be significantly improved. This structural optimization can not only improve the mixing effect of the materials, but also reduce energy consumption, control the temperature and pressure changes during the reaction process, and thus provide more stable and controllable reaction conditions for the efficient synthesis of pyraclostrobin. Summary of the invention

[0005] The purpose of the present invention is to provide a fishtail bionic static mixer for enhancing gas-liquid oxidation reactions. The mixing element can induce the pseudo-mixed fluid to effectively produce jets and vortex mixing under different fluid properties and operating conditions, thereby achieving the purpose of enhancing the gas-liquid oxidation reaction under low flow resistance conditions, so as to solve the problems existing in the above-mentioned prior art.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A fishtail bionic static mixer for strengthening gas-liquid oxidation reaction, the static mixer comprising a strengthening tube (1), a fishtail bionic static mixing element (2), a connecting piece (3) and a fixing piece (4); the fishtail bionic static mixing element is evenly or unevenly arranged in the strengthening tube and connected by the connecting piece; the middle ribs (2-1) of the bionic static mixing element are staggered; two adjacent fishtail bionic static mixing elements have a certain rotation angle in the axial direction; the fixing piece and the strengthening tube are fixedly matched by welding, threaded connection or the like to prevent the fishtail bionic static mixing element from rotating and deflecting in the working state.

[0008] Furthermore, the cross section of the strengthening tube (1) is circular, polygonal, or irregular in shape;

[0009] Furthermore, the bionic static mixing element (2) is formed by two spiral ribbons (2-2) with circular or square cross sections and a middle rib (2-1) twisted by 90° to 360° in a left-hand or right-hand rotation, and the width to length ratio of the fishtail bionic static mixing element is 2 to 4 times;

[0010] Furthermore, the middle ribs (2-1) are staggered and the cross-section of the ribs is V-shaped, circular, square, triangular, rhombus-shaped, etc.;

[0011] Furthermore, the axial cross-section of the middle rib (2-1) is V-shaped, M-shaped, S-shaped, etc., and the rib bending angle is 0° to 90°;

[0012] The rib surface is drilled with holes, and the hole shapes are any one or more combinations of teardrop-shaped holes, polygonal holes, star-shaped holes, etc.;

[0013] The advantages and effects of the present invention are:

[0014] 1. The bionic static mixing element of the present invention can shear the fluid through the middle ribs, promote fluid dispersion, enhance the degree of fluid turbulence, increase the gas-liquid interface area, improve the diffusion efficiency of the gas phase, and effectively increase the rate of gas-liquid reaction.

[0015] 2. The bionic static mixing element of the present invention has a surface drilling design of the middle rib that enables the fluid to produce jet and vortex mixing effects, which can not only increase the disturbance of the fluid, but also enhance the rupture and refinement of bubbles, further increase the gas-liquid interface area, and improve the reaction rate.

[0016] 3. The fishtail shape of the bionic static mixing element of the present invention can reduce flow resistance and enhance the full mixing of the fluid by inducing hairpin vortices without significantly increasing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of the structure of a fishtail bionic static mixer for enhancing gas-liquid oxidation reaction;

[0019] Figure 2 It is a front view of a V-shaped middle rib fishtail bionic static mixing element;

[0020] Figure 3 A side view of a V-shaped middle rib fishtail bionic static mixing element;

[0021] Figure 4 It is a front view of an M-shaped middle rib fishtail bionic static mixing element;

[0022] Figure 5 A side view of an M-shaped middle rib fishtail bionic static mixing element; DETAILED DESCRIPTION

[0023] The present invention provides a fishtail bionic static mixer for strengthening gas-liquid oxidation reaction. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The present invention is described in detail below with reference to the accompanying drawings.

[0025] Reference Figure 1 The components of the fishtail bionic static mixer for enhancing gas-liquid oxidation reaction include: an enhancing tube (1), a fishtail bionic static mixing element (2), a connecting piece (3) and a fixing piece (4).

[0026] The function of the connector is to fix the fishtail bionic static mixing element. According to the material of the fishtail bionic static mixing element, the mixing element can be fixed on the connector by welding or the like. The cross-sectional shape of the connector can be square, triangular, circular, Y-shaped, cross-shaped, etc.

[0027] The fishtail bionic static mixing elements are arranged uniformly or non-uniformly in the axial direction, and there is a certain spacing between two fishtail bionic static mixing elements, which is 0 to 4 times the width of the mixing element. At the same time, there is a certain staggered angle between the two fishtail bionic static mixing elements, which is 0° to 90°.

[0028] In order to ensure that the connected static mixing element will not be displaced or deflected during operation, fixing parts are installed on both sides of the static mixing element. Grooves are provided on both sides of the reinforcing tube so that the connecting parts can be inserted into them, limiting their circumferential rotation and hindering their axial and radial movement.

[0029] Example 1

[0030] The strengthening tube (1) is a circular tube with a cross section of 420 mm in length, made of stainless steel and placed vertically. The gas phase and the liquid phase enter the static mixer from the lower inlet in a concentric injection manner and flow out from the upper outlet after passing through the mixing section. A total of 4 fishtail bionic static mixing elements are arranged in the strengthening tube, which are connected in series using a square steel with a cross section of 2 mm and a length of 400 mm as a connecting piece (3). Square steel sheets with a length of 32 mm, a width of 2 mm and a thickness of 2 mm are welded on both sides of the square steel as fixing pieces (4). The middle rib (2-1) of the fishtail bionic static mixing element (2) is M-shaped (teardrop-shaped holes are set on the rib, and the rib bending angle is 0°), each fishtail bionic static mixing element is 28 mm wide and 60 mm long, and the staggered angle between two mixing elements is 90° and the spacing is 40 mm.

[0031] All connections in the entire fishtail bionic static mixer are welded to ensure that the mixer will not slip or deflect during operation.

[0032] Example 2

[0033] The components required for the fishtail bionic static mixer for enhancing the gas-liquid oxidation reaction of Example 2 are exactly the same as those of Example 1, except that the middle rib (2-1) of the static mixing element of this example is V-shaped (star-shaped holes are provided on the ribs, and the rib bending angle is 60°), and the other parameters of the element are the same as those of Example 1; since the ribs of the element of this example are not bent, there is no gap in the middle of the element for connecting the elements in series, and a Y-shaped connector is required to connect two adjacent elements.

Claims

1. A fishtail bionic static mixer for strengthening gas-liquid oxidation reaction, characterized in that: The static mixer comprises a reinforcing tube (1), a fishtail bionic static mixing element (2), a connecting piece (3) and a fixing piece (4); the fishtail bionic static mixing element is evenly or unevenly arranged in the reinforcing tube and connected by the connecting piece; the middle ribs (2-1) of the fishtail bionic static mixing element are staggeredly arranged, and the surface of the middle ribs (2-1) is drilled, and the hole shape is any one or more combinations of teardrop-shaped holes, polygonal holes, star-shaped holes, etc.; adjacent fishtail bionic static mixing elements have a certain rotation angle in the axial direction; the inlet and outlet of the fishtail bionic mixer are provided with fixing pieces for fixing the mixing element to prevent the mixing element from rotating or deflecting in the working state.

2. The fishtail bionic static mixer for enhancing gas-liquid oxidation reaction according to claim 1, characterized in that: The cross section of the strengthening tube (1) is circular, polygonal, or irregular in shape. The bionic static mixing element structure is formed by twisting two spiral ribbons (2-2) with circular or square cross sections and a middle rib (2-1) through 90° to 360° in a left-hand or right-handed manner. The cross section of the middle rib is square, triangular, or other geometric shapes. The width to length ratio of the element is 2 to 4 times.

3. The fishtail bionic static mixer for enhancing gas-liquid oxidation reaction according to claim 1, characterized in that: The axial cross section of the middle rib (2-1) is V-shaped, M-shaped, S-shaped, etc., and the rib bending angle is 0° to 90°.

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