Star-shaped rotational flow gas-liquid static mixing reactor

Abstract

The invention belongs to the technical field of chemical mixing and reaction equipment, and particularly relates to a star-shaped rotational flow gas-liquid static mixing reactor which is composed of a star-shaped rotational flow static mixing element, a fixing part, a reaction tube, a dispersed phase inlet tube and a heat exchange jacket. The star-shaped element is formed by arranging a plurality of star-shaped splitter plates in the circumferential direction of the fixed shaft in a rotating mode, a multi-shearing-layer spiral flow channel is formed, fluid rotational flow cutting and staggering can be achieved, the gas-liquid contact area is increased, and the two-phase mixing and mass transfer efficiency is remarkably improved. The number of vertexes of the star-shaped splitter plate is determined by the number of edges of a circle internally tangent polygon, the spaced vertexes are sequentially connected to form a star-shaped main body frame, intersection points of the frame are respectively connected with a circle center point to form the star-shaped splitter plate, a boundary layer can be effectively destroyed, heat exchange between core flow and a near wall surface area is promoted, and timely removal of reaction heat is ensured. The gas-liquid two-phase uniform mixing device can quickly realize gas-liquid two-phase uniform mixing, improves the reaction efficiency, accurately controls the reaction temperature, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical mixing and reaction equipment, and in particular relates to a star-shaped cyclone gas-liquid static mixing reactor. Background Art

[0002] As a highly efficient multiphase reaction engineering equipment, gas-liquid reactors are widely used in catalytic hydrogenation, oxidation reactions, wastewater treatment and other process. The built-in static mixing element can destroy the laminar boundary layer in the reaction tube, promote bubble breakage, optimize the gas-liquid dispersion efficiency, increase the mass transfer rate and shorten the reaction time. This passive enhancement method does not require additional energy input, can effectively improve the mixing efficiency of the gas-liquid two-phase, increase the contact area between the phases, reduce gas diffusion resistance, raw material consumption and system energy consumption. Developing a new type of gas-liquid static mixing reactor to achieve the intensification of the gas-liquid two-phase flow reaction process and promote the transformation of chemical, energy, environmental protection and other fields to efficient, green and intelligent ones is of great significance to achieving the "dual carbon" goals, resource recycling and high-end manufacturing upgrades.

[0003] The ozone oxidation method for treating wastewater belongs to a gas-liquid oxidation treatment process. Its principle is that the ozone molecules introduced into the wastewater will decompose to produce hydroxyl radicals, etc., and the pollutants in the wastewater will be degraded through the synergistic effect of direct oxidation and indirect oxidation. With its strong oxidation ability and the advantages of no secondary pollution, it has become an important method in the field of deep wastewater treatment, especially in the treatment of difficult-to-degrade organic matter. It has shown remarkable effects. However, the current traditional static wastewater tank aeration technology has problems such as low gas-liquid mixing and mass transfer efficiency, resulting in the failure to fully utilize the ozone oxidation wastewater treatment capacity. Based on this, the present invention proposes a star-shaped cyclone static mixing reactor, which can increase the contact interface between gas and liquid, improve mixing and mass transfer efficiency, significantly reduce energy consumption and operating costs, so that organic pollutants in wastewater can be completely oxidized and decomposed in a relatively short time, and provide a new solution for the intensification of gas-liquid process such as ozone oxidation. Summary of the invention

[0004] The present invention provides a star-shaped cyclone gas-liquid static mixing reactor, which can induce cyclone, cutting and interlacing effects in gas-liquid two-phase flow under different working conditions and operating conditions, thereby achieving homogenization of the dispersed phase to solve the prior art problems mentioned in the above background.

[0005] The technical solution adopted by the present invention is:

[0006] A star-shaped cyclone gas-liquid static mixing reactor, characterized in that the static mixing reactor comprises a star-shaped cyclone static mixing element, a fixing member, a reaction tube, a dispersed phase inlet pipe and a heat exchange jacket;

[0007] Further, both ends of the reaction tube are respectively arranged as a feed inlet and a discharge outlet, and the reaction tube can be installed horizontally or vertically; the dispersed phase inlet tube is arranged on the side wall surface of the reactor feed inlet and can be provided with a single or multiple ones at different deflection angles along the radial direction of the reaction tube.

[0008] Further, the star-shaped swirl static mixing element is located at the center of the reaction tube and is evenly distributed along the axis direction of the reaction tube;

[0009] Further, the fixing member includes a fixed shaft and a fixing plate. The fixed shaft coincides with the central axis of the reaction tube, and the fixed shaft passes through the centers of the star-shaped swirl mixing element and the fixing plate; the fixing plate is located between the flanges, and the flanges are located at the feed inlet and the discharge outlet of the reaction tube;

[0010] Further, the heat exchange jacket is located on the outer wall of the reactor, and the jacket inlet and outlet are respectively arranged on both sides of the outer wall surface of the jacket, and multiple groups of baffle plates are arranged inside the jacket.

[0011] The star-shaped swirl static mixing element is connected to the fixed shaft in the form of threads or welding to prevent the star-shaped swirl static mixing element from shifting in position;

[0012] Further, the fixing plate is clamped between the flanges and is connected to the fixed shaft in the form of threads or welding;

[0013] Further, the flange is connected to the reactor in the form of welding.

[0014] The star-shaped swirl static mixing element is composed of the arrangement of multiple basic periodic units;

[0015] Further, the basic periodic unit is composed of n (n≥8) star-shaped flow dividing plates arranged in a circumferential rotation along the fixed shaft;

[0016] Further, the rotation angle of the star-shaped flow dividing plate is α / n (60°≤α≤360°);

[0017] Further, the distance between adjacent star-shaped flow dividing plates is 0 to 0.3 times the diameter of the reaction tube.

[0018] The number of vertices of the star-shaped flow dividing plate is determined by the number of sides (m) of the inscribed polygon of the circle, and the angle between adjacent vertices is 360° / m, where the polygon includes pentagon, hexagon, heptagon, octagon, etc.;

[0019] Further, the adjacent vertices are sequentially connected to form a star-shaped main frame, and each intersection point of the star-shaped main frame is respectively connected to the center point to form a star-shaped flow dividing plate;

[0020] Further, the material of the star-shaped flow dividing plate is square steel or angle steel, etc.;

[0021] Further, the distance between the outer edge of the star-shaped splitter plate and the inner wall of the reaction tube is 0 to 0.1 times the diameter of the reaction tube;

[0022] Furthermore, the thickness of the star-shaped manifold is 0.05 to 0.1 times the diameter of the reaction tube.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are:

[0024] (1) The present invention innovatively achieves efficient mixing of gas-liquid two-phase flow by arranging a star-shaped diverter plate in the reaction tube. The number of vertices of the star-shaped diverter plate is determined by the number of edges of the inscribed polygon of the circle. The vertices are connected in sequence to form a star-shaped main frame, and the intersections of the star-shaped main frame are respectively connected to the center point of the circle to form a star-shaped diverter plate. Each edge line in the plate is cut and intersected to form a multi-angle star structure. When the fluid flows through the star-shaped diverter plate, a cutting effect can be triggered to divide the fluid into finer tributaries. After multiple star-shaped diverter plates are evenly arranged, a multi-shear layer flow channel is formed, so that the gas phase can achieve continuous cutting and interlacing of the fluid during the two-phase flow process, thereby enhancing the bubble crushing effect, increasing the contact area between the gas and liquid phases, and significantly improving the mixing effect and reaction mass transfer efficiency of the gas-liquid system.

[0025] (2) The present invention forms a spiral flow path by arranging multiple star-shaped flow dividers in a circumferentially rotating manner. Each change in the rotation angle and spacing will change the direction and intensity of the swirl, thereby forming a complex spiral structure, causing the fluid to exhibit nonlinear disturbance behavior in the pipeline, thereby significantly increasing the turbulence intensity and enhancing the mixing effect without significantly increasing the flow resistance.

[0026] (3) The star-shaped manifold in the present invention has a star-shaped sharp-angle structure and is close to the inner wall of the reaction tube. When the fluid contacts these sharp edges, the direction and flow rate will change sharply, generating local turbulence and vortex, destroying the fluid boundary layer effect, promoting the heat exchange between the core fluid and the inner wall of the tube, and ensuring that the reaction heat is removed in time. The sharp geometric shape makes the fluid flow pattern more complex, increases the turbulence intensity, and improves the heat transfer and reaction rate in the gas-liquid two-phase flow system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1 It is a front view of the overall structure of the star-shaped cyclonic gas-liquid static mixing reactor in the present invention.

[0029] Figure 2 It is a left view of the star-shaped diverter plate structure of the present invention.

[0030] Figure 3It is a left view of the star-shaped manifold structure of different units in the present invention.

[0031] Figure 4 It is a schematic diagram of the basic periodic unit structure of the star-shaped swirl static mixing in the present invention.

[0032] Figure 5 It is a schematic diagram of the structure of the star-shaped swirl static mixing element in the present invention.

[0033] Figure 6 It is a left view of the structure of the star-shaped swirl static mixing element in the present invention.

[0034] Figure 7 It is a schematic diagram of the fixing structure of the present invention.

[0035] The reference numerals in the above drawings indicate:

[0036] 1-reactor; 2-dispersed phase inlet pipe; 3-star-shaped splitter plate; 4-baffle plate; 5-heat exchange jacket inlet; 6-flange; 7-jacket; 8-heat exchange jacket outlet; 9-fixing part (9-1-fixing plate; 9-2-fixing shaft); 10-basic periodic unit. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Combination Figure 1 As shown, the star-shaped cyclone gas-liquid static mixing reactor of the present invention is composed of a star-shaped cyclone static mixing element, a fixing part, a reaction tube, a dispersed phase inlet pipe and a heat exchange jacket.

[0039] The star-shaped swirl static mixing element is located at the center of the reactor and is fixed in position by a combined fixing piece, wherein the fixing shaft in the fixing piece is connected to the center of the star-shaped swirl static mixing element by welding, and the fixing plate is clamped between flanges, which are respectively located at the feed inlet and the discharge port of the reactor and at both ends of the star-shaped swirl static mixing element, so as to facilitate the installation and fixation of the star-shaped swirl static mixing element.

[0040] The two ends of the reactor are respectively provided with a feed port and a discharge port, and the continuous phase flows into the reactor from the feed port along the axial direction;

[0041] Furthermore, the dispersed phase inlet pipe is on the side wall of the reactor feed port, and the dispersed phase flows into the reactor in a radial direction.

[0042] The heat exchange jacket is located on the outer wall of the reactor and is provided with a plurality of baffles;

[0043] Furthermore, the jacket inlet and outlet are respectively arranged on both sides of the jacket outer wall;

[0044] Furthermore, the heat exchange fluid flows in from the heat exchange jacket inlet along the radial direction of the jacket, flows through a plurality of baffles, and then flows out from the heat exchange jacket outlet along the radial direction of the jacket.

[0045] Combination Figure 2 As shown, the number of vertices of the star-shaped manifold in the present invention is determined by the number of sides (m) of the inscribed polygon of the circle, and the angle between adjacent vertices is 360° / m, wherein the polygon includes a pentagon, a hexagon, a heptagon, an octagon, etc. The alternate vertices are sequentially connected to form a star-shaped main frame, and each intersection of the star-shaped main frame is respectively connected to the center point of the circle to form a star-shaped manifold.

[0046] Furthermore, the present invention adopts an inscribed hexagon to form a hexagonal star-shaped manifold;

[0047] Furthermore, the star-shaped spoiler may be made of square steel or angle steel.

[0048] Combination Figure 3 As shown, the same principle can be applied to polygons with different numbers of sides and lengths, such as pentagons, heptagons and octagons, to form star-shaped manifolds with similar structures and functions.

[0049] Combination Figure 4 As shown, a basic periodic unit in the star-shaped cyclonic gas-liquid static mixing element is composed of n (n≥8) star-shaped flow dividers arranged in multiple stages at a certain circumferential rotation angle.

[0050] Furthermore, the circumferential deflection angle between adjacent star-shaped diverter plates is α / n (60°≤α≤360°). Each time a star-shaped diverter plate is rotated, it is moved a certain distance along the axial direction of the fixed axis until the rotation angle of the nth star-shaped diverter plate is the same as that of the first star-shaped diverter plate, thus forming a basic periodic unit of a star-shaped cyclonic gas-liquid static mixing element.

[0051] Combination Figure 5 As shown, the star-shaped swirl gas-liquid static mixing element is composed of multiple groups of basic periodic units connected in series along the axial direction of a fixed axis.

[0052] Furthermore, the spacing between the star-shaped manifolds is consistent with the spacing between the basic periodic units, and the spacing is 0 to 0.3 times the inner diameter of the reactor.

[0053] Furthermore, the number of basic cycle units can be adjusted according to specific working conditions and operating conditions to meet different application requirements.

[0054] Combination Figure 6 As shown in the figure, due to the rotation of the star-shaped flow divider, a swirl channel is formed inside the polygon. At the same time, the axial arrangement of the star-shaped flow divider results in gaps between the star-shaped flow dividers, which enables the fluid to be divided into finer branches when the material flows through this part, resulting in multiple cutting effects, which promotes the mixing and mass transfer of the two phases.

[0055] Furthermore, combined with Figure 5 and Figure 6 As shown in FIG. 1 , due to the presence of a triangular circumferential array on the outer edge of the star-shaped swirl gas-liquid static mixing element, a multi-shear layer material cutting is formed on the outer edge. At the same time, the rotation and equidistant arrangement of the star-shaped splitter plates also generate swirl channels on the outer edge.

[0056] Combination Figure 7 As shown, the fixing member includes a fixing shaft and a fixing plate, the fixing shaft coincides with the central axis of the reaction tube, and the fixing shaft passes through the center of the star-shaped swirl mixing element and the fixing plate;

[0057] Furthermore, the fixing plate is located between the flanges, and the flanges are located at the front and rear ends of the reaction tube, so as to ensure that the star-shaped swirl static mixing element does not deviate in position during installation and operation.

[0058] The present invention realizes efficient mixing of gas-liquid two-phase flow by arranging an innovative star-shaped diverter plate in the reaction tube. The polygonal vertices inside the star-shaped diverter plate are connected to the central axis, and the edges extend outward and intersect to form a triangular array along the circumferential direction. The cutting and intersecting edges form a polygonal star structure. When the fluid flows through the star-shaped diverter plate, the cutting effect divides the fluid into finer tributaries, enhances the bubble crushing effect, increases the gas-liquid contact area, and thus improves the mixing effect and reaction mass transfer efficiency. Multiple star-shaped diverters are evenly distributed and arranged in a circumferential rotation to form a spiral flow path. By adjusting the rotation angle and spacing, the direction and intensity of the swirl can be changed, thereby generating a complex spiral structure, enhancing the formation and development of turbulence, and improving the turbulence intensity and mixing degree without significantly increasing the flow resistance. The star-shaped pointed structure of the star-shaped manifold is close to the wall of the reaction tube. When the fluid contacts these sharp edges, drastic changes in direction and flow rate will occur, resulting in local turbulence and vortices, destroying the fluid boundary layer effect, promoting heat exchange between the core fluid and the inner wall of the tube, ensuring that the reaction heat is removed in time, and improving the heat transfer and reaction rate in the gas-liquid two-phase flow system.

[0059] Embodiment 1:

[0060] The present invention is described below in conjunction with specific data: the star-shaped swirl static mixing element is connected by 4 groups of basic periodic units, two supports and a central fixed axis. The basic periodic unit is composed of 12 hexagonal star-shaped diverter plates that are evenly distributed and rotated. The plate diameter of the star-shaped diverter plate is 190 mm and the thickness is 3 mm; the length of the fixed axis is 1200 mm and the diameter is 5 mm; taking the first star-shaped diverter plate as the reference, the second star-shaped diverter plate is rotated 10° clockwise relative to the first star-shaped diverter plate, and is offset by 5 mm in the downstream direction of the fixed axis, and so on, until the twelfth star-shaped diverter plate is rotated 120° relative to the first star-shaped diverter plate, it is considered that a basic periodic unit of a star-shaped swirl gas-liquid static mixing element is completed. Based on this group of basic periodic units, the adjacent basic periodic units are deflected 10° clockwise, that is, two groups of basic periodic units are connected in series along the axial direction of the fixed axis.

[0061] Furthermore, the star-shaped manifold can be formed by polygons such as pentagons, heptagons, octagons, etc. according to the same principle, such as Figure 4 As shown; the circumferential deflection angle, offset spacing, star-shaped manifold diameter, number of elements, etc. can vary according to different operating conditions.

[0062] Embodiment 2:

[0063] A working condition for treating wastewater by ozone oxidation in a star-shaped cyclonic gas-liquid static mixing reactor is preset, and the static mixing element in Example 2 is basically the same as that in Example 1.

[0064] Ozone as dispersed phase flows into the reactor tube from the dispersed phase inlet pipe along the radial direction of the reactor, and wastewater as continuous phase flows into the reactor from one end of the reactor along the axial direction of the reactor. After the two-phase fluid flows through the star-shaped swirl static mixing element, it flows out of the reactor along the other end of the reactor. Among them, the star-shaped swirl static mixing element adopts a hexagonal star-shaped splitter plate.

[0065] Furthermore, due to the rotation of the star-shaped diverter plate, the inner and outer edges of the polygon form swirl channels, which promote the flow of ozone and wastewater along the axis of the tube, and the sharp structure of the outer edge destroys the boundary layer inside the tube. At the same time, due to the axial offset of the star-shaped diverter plate, there are gaps between the star-shaped diverter plates, which enables ozone and wastewater to produce multiple cutting effects when flowing through the star-shaped swirl static mixing element, thereby increasing the contact area with the wastewater. The swirl and cutting effects are coupled with each other, which can significantly increase the shearing effect on ozone and wastewater, thereby promoting the fragmentation and refinement of ozone, and enhancing the mixing, heat transfer and mass transfer efficiency of ozone and wastewater.

[0066] In the system of the present invention, the particle size of the bubbles is 1 to 2 orders of magnitude smaller than that of conventional bubbles, the mass concentration of ozone in water can reach 11 mg / L, and the ozone mass transfer rate can reach 0.04 min-1 , the amount of ozone added is less, the utilization rate is higher, and the mass transfer effect and reaction rate are better than traditional processes.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. Anyone should know that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. A star-shaped cyclonic gas-liquid static mixing reactor, characterized in that: The static mixing reactor comprises a star-shaped cyclone static mixing element, a fixing member, a reaction tube, a dispersed phase inlet tube and a heat exchange jacket; The two ends of the reaction tube are respectively arranged as a feed port and a discharge port, wherein the reaction tube can be installed horizontally or vertically; the dispersed phase inlet pipe is arranged on the side wall of the reactor feed port, and a single or multiple inlet pipes can be arranged at different angles along the radial deflection of the reaction tube. The star-shaped swirl static mixing element is located at the center of the reaction tube and is evenly distributed along the axis of the reaction tube; The fixing member comprises a fixing shaft and a fixing plate, the fixing shaft coincides with the central axis of the reaction tube, and the fixing shaft passes through the center of the star-shaped swirl mixing element and the fixing plate; the fixing plate is located between the flanges, and the flanges are located at the feed inlet and the discharge port of the reaction tube; The heat exchange jacket is located on the outer wall of the reactor, the jacket inlet and outlet are respectively arranged on both sides of the outer wall of the jacket, and a plurality of baffles are arranged inside the jacket.

2. The star-shaped cyclone static mixing reactor according to claim 1, characterized in that: The star-shaped swirl static mixing element is connected to the fixed shaft to prevent the star-shaped swirl static mixing element from positional displacement; the fixed plate is clamped between the flanges and connected to the fixed shaft; the flange is connected to the reactor in the form of welding.

3. The star-shaped swirl static mixing element according to claim 1, characterized in that: The star-shaped swirl static mixing element is composed of a plurality of basic periodic units arranged; the basic periodic unit is composed of n (n≥8) star-shaped diverter plates arranged and rotated circumferentially along a fixed axis; wherein the rotation angle of the star-shaped diverter plates is α / n (60°≤α≤360°), and the spacing between adjacent star-shaped diverter plates is 0 to 0.3 times the diameter of the reaction tube.

4. The star-shaped manifold according to claim 3, characterized in that: The number of vertices of the star-shaped manifold is determined by the number of sides of the inscribed polygon (m), and the angle between adjacent vertices is 360° / m, where the polygons include pentagons, hexagons, heptagons, octagons, etc. The alternate vertices are connected in sequence to form a star-shaped main frame, and the intersections of the star-shaped main frame are connected to the center point of the circle to form a star-shaped manifold. The material of the star-shaped manifold can be square steel or angle steel; the distance between the outer edge of the star-shaped manifold and the inner wall of the reaction tube is 0 to 0.1 times the diameter of the reaction tube; the thickness of the star-shaped manifold is 0.05 to 0.1 times the diameter of the reaction tube.

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