CN115253834B - High-flux passive type rotational flow reinforced micro-mixer - Google Patents
High-flux passive type rotational flow reinforced micro-mixer Download PDFInfo
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- CN115253834B CN115253834B CN202210913993.6A CN202210913993A CN115253834B CN 115253834 B CN115253834 B CN 115253834B CN 202210913993 A CN202210913993 A CN 202210913993A CN 115253834 B CN115253834 B CN 115253834B
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- 239000000463 material Substances 0.000 claims abstract description 51
- 230000004907 flux Effects 0.000 claims abstract description 5
- 239000011797 cavity material Substances 0.000 claims description 71
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 14
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/30—Micromixers
- B01F33/301—Micromixers using specific means for arranging the streams to be mixed, e.g. channel geometries or dispositions
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Abstract
A high-flux passive cyclone reinforced micromixer belongs to the technical field of micro-chemical industry. The high-flux passive cyclone reinforced micro-mixer comprises a bottom feed distributor, a middle feed distributor, a mixing cavity, a micro-channel flow dividing element and a mixing cavity upper cover plate. The micro mixer is characterized in that a plurality of flow dividing plates and a plurality of circular plates are stacked in a staggered manner to form a micro-channel flow dividing element, so that the material flows from inside to outside, the speed is gradually reduced, and good initial conditions are provided for the next laminar diffusion; the inner wall surface of the mixing cavity is of a ladder structure so as to avoid fluid attachment and improve the material mixing efficiency; a swirl element is additionally arranged at the discharge port to improve the disturbance of the converged fluid, so that the mixing effect is further enhanced; compared with a mixer in an outside-in flow mode, the invention is not limited by the size of the central tube, can be flexibly designed according to the flow, and has the characteristics of large flux, high efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of micro-chemical industry, and particularly relates to a high-flux passive cyclone reinforced micro-mixer.
Background
The micromixer is beneficial to improving the product yield in the chemical reaction process, reducing the generation of byproducts and reducing the energy consumption of the chemical reaction by virtue of the unique advantages of high-efficiency mass transfer, heat transfer and small liquid holding capacity, so that the chemical reaction process is environment-friendly.
Current micromixers include active micromixers that mix fluids by external excitation and passive micromixers; the passive micromixer achieves the purpose of rapid mixing by increasing the chaotic flow degree of the fluid through various microchannel structures. The passive micromixer is widely used due to the characteristics of simple structure, easy integration, no need of external power source, etc. However, the micromixers currently on the market have the following problems:
(1) The characteristic size of the conventional Y-shaped, T-shaped, snake-shaped and heart-shaped micro-channel mixers is between 10 and 1000 mu m, the flux is small, and the micro-channel mixers are difficult to assemble and disassemble.
(2) The existing large-flux star-shaped micromixer material flows from outside to inside, so that the flow speed of the material is increased, and the diffusion mixing time is reduced; in addition, the mixer which flows from outside to inside is limited by the size of the central tube, when the flow rate is further increased, the diameter of the feeding position is increased, and the size of the central tube is increased, but the optimal matching between the flowing distance from the feeding to the central tube and the size of the central tube is difficult, so that the high-pass quantity is not facilitated; and the effluent fluid has the problem of wall attachment on the surface of the center cone, thereby reducing the mixing efficiency.
Disclosure of Invention
In order to overcome the defects in the prior art and improve the problems, the invention provides a high-flux passive cyclone reinforced micro-mixer, which comprises a bottom feed distributor, a middle feed distributor, a mixing cavity, a micro-channel flow dividing element and a mixing cavity upper cover plate which are sequentially connected, wherein the bottom feed distributor comprises a bottom feed cavity communicated with an A feed pipe, the middle feed distributor comprises a middle feed cavity communicated with a B feed pipe, and the periphery of the middle feed cavity on the middle feed distributor is provided with an A material hole penetrating through the middle feed distributor.
The mixing cavity adopts a structure that a plurality of mixing cavity material holes are formed in the bottom of the mixing cavity, a gradually-expanding mixing cavity is formed in the direction of an outlet, and the wall surface of the mixing cavity is a smooth wall surface or a stepped wall surface.
The micro-channel flow dividing element is arranged in the mixing cavity, the micro-channel flow dividing element comprises flow dividing plates and circular plates which are sequentially staggered and stacked, the periphery of each flow dividing plate is provided with a bulge, the flow dividing plates and the adjacent circular plates form micro-channels which are gradually expanded from inside to outside, and the adjacent flow dividing plates are staggered; the micro-channel flow dividing element consisting of the flow dividing plate and the circular plate is provided with a through flow dividing element material hole at a position corresponding to the material hole of the mixing cavity.
The upper cover plate of the mixing cavity is communicated with the outlet pipe.
In some embodiments, the micromixer further includes a cyclone element, one end of the cyclone element is connected to the microchannel split element, the other end is connected to the upper cover plate, and the cyclone element adopts a structure that a plurality of cyclone blades are arranged on the cyclone bottom plate.
In some embodiments, the number of steps of the step wall is 3-10, the height is 0.5-5mm, and the width is 0.1-5mm.
In some specific embodiments, the number of the flow dividing plates is 10-500, the protrusions on the flow dividing plates are elliptical, circular or triangular, the number of the protrusions is n, and the staggered angle between adjacent flow dividing plates is 180/n degrees; wherein n is an even number from 6 to 50.
In some specific embodiments, the thickness of the flow dividing plate is 10-1000 μm, and the height h of the top ends of the protrusions from the center of the material hole of the flow dividing element is 0.5-20 mm; the thickness of the circular plate is 10-1000 mu m, and the diameter is 10-300mm.
In some embodiments, the maximum equivalent diameter of the diverter plate is no greater than the diameter of the circular plate.
In some embodiments, the flow splitting element material holes have an equivalent diameter of 0.5 to 20mm.
In some embodiments, the swirl element comprises at least 3 swirl vanes, which are arcuate or rectilinear.
In some specific embodiments, the thickness of the swirl vane is 0.3-5mm, the height is 2-50mm, and the diameter of the swirl bottom plate is not larger than the diameter of the circular plate.
In some embodiments, the material holes 4-1 of the mixing cavity are sequentially and alternately communicated with the middle feeding cavity 3-1 and the bottom feeding cavity 2-1. The material hole 4-1 of the mixing cavity is communicated with the bottom feeding cavity 2-1 through the material hole A.
In some embodiments, the diverter element material aperture is disposed in a recess where two adjacent protrusions connect.
The beneficial effects of the invention are as follows:
the micromixer is designed into a detachable structure, is easy to process, is convenient to maintain and reuse, and reduces the processing difficulty and the use cost of the micromixer.
The micro mixer sequentially and alternately stacks the plurality of flow distribution plates and the plurality of circular plates, the flow distribution plates are provided with the convex structures, the flow distribution plates and the circular plates on two sides form a gradually-expanded fluid micro-channel, macroscopic fluid is divided into fluid thin layers with the thickness of a micron level, the fluid of the micro thin layers flows into the mixing cavity, the fluid flows into the mixing cavity through layer-by-layer superposition, the mutual diffusion time is shortened, the mixing time between materials is shortened, and the mixing efficiency of the materials is improved. The height of the bulges on the flow dividing plate can be designed according to the requirements of fluid and flow, and the flow dividing plate can be suitable for mixing fluids with different properties. The thickness and the maximum diameter of the splitter plate and the circular plate can be changed according to the process conditions, so that the advantage of uniform mixing of the micro-mixing technology is utilized, and the requirement of large flow in industrial application is met.
One advantage of the flow dividing plate as the flow of the micromixer increases is that the mixing efficiency of the micromixer of the present invention can be maintained high while the overall pressure drop remains unchanged by adjusting the number of material holes and the distance to the boundary of the circular plate.
The wall surface of the mixing cavity is designed to be a stepped wall surface, so that fluid entering the mixing cavity can be separated from the wall surface in advance, and the condition of uneven mixing of low-flow-rate fluid caused by the wall attachment problem is avoided, so that the mixing efficiency is improved.
At least 3 swirl elements with swirl blades are designed to converge the fluid and form a swirl reinforcing effect on the fluid, so that the fluid turbulence degree is increased, the fluid is disturbed, the mixing effect of the fluid under a low Reynolds number is further enhanced, and the mixing efficiency is improved.
The invention fully utilizes the characteristic of high-efficiency mass transfer of the micro-channel, avoids the defects of small flux and nonuniform mixing of the conventional mixer of the general micro-mixer, and adopts a plurality of flow dividing plates and a plurality of circular plates to form the large-flux micro-mixer with adjustable flux.
Compared with a mixer from outside to inside, the structure design of the invention is not limited by the size of the central tube, when the flow is increased, the diameter of the feeding position can be increased, and the proper distance from the feeding to the flow of the fluid in the mixing cavity is ensured by adjusting the diameter of the micro-channel flow dividing element, thereby realizing the reasonable design of the micro-channel flow dividing element under the condition of large flow.
Drawings
FIG. 1 is an internal block diagram of a high throughput passive swirl-enhanced micromixer.
Fig. 2 is a top view of the mid-feed distributor of fig. 1.
Fig. 3 is a perspective view of the microchannel shunting element of fig. 1.
Fig. 4 is a top view of the swirl element of fig. 1.
Fig. 5 is a mixing effect diagram of the micromixer.
Wherein a is a front view full section mixing effect diagram, and b is an outlet section mixing effect diagram.
FIG. 6 is a graph of the mixing effect of a micromixer in the literature.
Wherein a is a front view full section mixing effect diagram, and b is an outlet section mixing effect diagram.
Fig. 7 is a diagram of the mixing effect of a micromixer provided with swirl elements.
Wherein a is a front view full section mixing effect diagram, and b is an outlet section mixing effect diagram.
In the figure: 1. the device comprises a feeding pipe A, a feeding distributor 2-1, a feeding cavity at the bottom, a feeding distributor 3, a feeding distributor at the middle, a feeding distributor 3-1, a feeding cavity at the middle, a material hole 3-2, a material hole A, a material hole 3-3, a feeding distributor bolt hole at the middle, a mixing cavity 4-1, a material hole at the mixing cavity 4-2, a mixing cavity inner wall surface 4-3, a mixing cavity 5, a micro-channel flow dividing element 5-1, a circular plate 5-2, a flow dividing plate 5-3, a flow dividing element material hole 5-4, a bulge 5-5, a flow dividing element positioning hole 6, a fixing bolt 7, an upper cover plate 8, an outlet pipe 9, a flow dividing positioning pin 10, a rotational flow element 10-1, rotational flow blades 10-2, a rotational flow bottom plate 10-3, a rotational flow element positioning hole 11, a sealing ring 1, 12, a sealing ring 2, a feeding pipe 13, a sealing ring 14, a sealing ring 3-15 and a fixing nut.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
Fig. 1 shows a high throughput passive swirl-enhanced micromixer comprising a feed pipe 1, a bottom feed distributor 2, a middle feed distributor 3, a mixing chamber 4, a microchannel splitting element 5, an upper cover plate 7, an outlet pipe 8, a swirl element 10, b feed pipe 13.
The bottom feed distributor 2 comprises a bottom feed cavity 2-1 communicated with the A feed pipe 1, the middle feed distributor 3 comprises a middle feed cavity 3-1 communicated with the B feed pipe 13, and the periphery of the middle feed cavity 3-1 on the middle feed distributor 3 is provided with A material holes 3-2 (shown in figure 2) penetrating through the middle feed distributor.
The bottom of the mixing cavity 4 is provided with mixing cavity material holes 4-1, the mixing cavity material holes 4-1 are uniformly distributed on the same circumference as the A material holes 3-2, and the mixing cavity 4 is provided with a mixing cavity 4-3 which has a ladder structure and gradually expands from an inlet to an outlet. The material holes 4-1 of the mixing cavity are sequentially and alternately communicated with the middle feeding cavity 3-1 and the bottom feeding cavity 2-1. The material hole 4-1 of the mixing cavity is communicated with the bottom feeding cavity 2-1 through the material hole A.
The micro-channel flow dividing element 5 is arranged in the mixing cavity 4-3, the micro-channel flow dividing element 5 comprises round plates 5-1 and flow dividing plates 5-2 which are alternately stacked in sequence, the periphery of each flow dividing plate 5-2 is alternately provided with a bulge 5-4, the flow dividing plates 5-2 and adjacent round plates 5-1 form outwards gradually-expanded micro-channels, and the adjacent flow dividing plates 5-2 are alternately arranged (shown in figure 3).
The micro-channel flow dividing element 5 is provided with a flow dividing element material hole 5-3 at a position corresponding to the mixing cavity material hole, and the middle part of the micro-channel flow dividing element 5 is provided with a flow dividing element positioning hole 5-5.
The cyclone element 10 adopts a structure that a plurality of uniformly distributed cyclone blades 10-1 are arranged on a cyclone bottom plate 10-2, the cyclone bottom plate 10-2 of the cyclone element 10 is connected with one end of a micro-channel flow dividing element 5, the outer edge side is communicated with a mixing cavity 4-3, and the middle part is communicated with an outlet pipe 8 (shown in figure 4).
An upper cover plate 7 is arranged above the mixing cavity 4, and the top of the upper cover plate is connected with an outlet pipe 8. The swirl element 10 is arranged in an inner cavity communicating with the mixing chamber 4-3 in the upper cover plate 7.
The swirl element 10, the microchannel flow dividing element 5, the mixing chamber 4 are positioned by a flow dividing positioning pin 9.
The bottom feed distributor 2 and the middle feed distributor 3 are sealed by a sealing ring 14, the middle feed distributor 3 and the mixing cavity 4 are sealed by a sealing ring 12, and the mixing cavity 4 and the upper cover plate 7 are sealed by a sealing ring 11.
The bottom feeding distributor 2, the middle feeding distributor 3, the mixing cavity 4 and the upper cover plate 7 are fixedly connected through the fixing bolts 6 and the fixing nuts 15.
The mixing process of the high-flux passive cyclone reinforced micro-mixer material comprises the following steps: taking a mixing process of a material A and a material B as an example, the material A enters a bottom feeding cavity 2 from a material inlet pipe 1, and then flows through a material hole 3-2 from the bottom feeding cavity 2 to enter a material hole 4-1 of a part of the mixing cavity; the material B enters the middle feeding cavity 3-1 through the material B feeding pipe 13, and then enters the material hole 4-1 of the mixing cavity through the middle feeding cavity 3-1; the material A and the material B in the material hole 4-1 of the mixing cavity enter the material hole 5-3 of the flow dividing element of the micro-channel flow dividing element 5 and respectively flow out of the micro-channel to form a fluid thin layer with the thickness of micron level and enter the mixing cavity 4-3 for mixing; the mixed material flows into the cyclone element 10 for intensified mixing and finally flows out of the outlet pipe 8.
Example 1
The micromixers described in the present invention and in the literature (Y. Men, V. Hessel, etc. Trans IChemE, part A, chem Eng Res Des, 2007,85 (A5): 605-611.) were compared, and in order to ensure consistency of the comparison conditions, the same-layer number of microchannel flow dividing elements were used without swirl elements.
Structural parameters: the micromixers reported in the invention and the literature are provided with 65 circular plates and 65 flow dividing plates, the thicknesses of the circular plates and the flow dividing plates are 0.1mm, the diameters of the circular plates are 22mm, and the equivalent diameters of the material holes of the flow dividing elements are 1.5mm. The number of steps in the mixing cavity is 5, the height of a single step is 1mm, the width of the single step is 0.5mm, and the circle centers of the material holes of the flow dividing element are uniformly distributed on the circumference with the diameter of 10 mm. The conical bottom of the micromixer of the comparative literature has a diameter of 4.8mm and a height of 15mm.
Simulation parameters: the component transportation is taken as a model by Fluent software, and the diffusion coefficient of the substance is 2.3e-9m 2 And/s, wherein the flow is 430L/h, the calculated outlet parameter is stable and the residual error is converged, and then the outlet mixing efficiency eta of the micro-mixer is calculated by the following formula:
as shown in fig. 5, the mixing efficiency of the present invention, which does not include a swirl element, was 92%. As shown in fig. 6, the mixing efficiency of the comparative document under this condition is 80%. It can be seen that: under the condition of the same structural parameters, the efficiency of the micromixer is superior to that of the micromixer in the literature. And (3) reason analysis: the middle of the literature micromixer is provided with a conical structure, so that low-speed fluid adheres to the wall, the mixing effect of the fluid in the center of the outlet section is poor, and the overall efficiency is low; the micro-mixer fluid flows from inside to outside, the speed is gradually reduced, the mixing of the two fluids in the mixing cavity is facilitated, and the stepped wall surface is arranged in the mixing cavity, so that the phenomenon of fluid wall attachment is avoided, and the efficiency is higher.
Example 2
In order to demonstrate the strengthening effect of the swirl element on the invention, the mixing effect of the micromixer of the invention with and without the swirl element was compared. Structural parameters of the present embodiment: the radius of curvature r of the swirl vanes is 11mm, the thickness t is 0.5mm, the height is 4mm, and the swirl vanes are 6 swirl vanes which are uniformly distributed, and other structural parameters are the same as those of the invention in the embodiment 1.
The simulation parameters are the same as in example 1, and as shown in fig. 7, the mixing efficiency of the micromixer (comprising a swirl element) of the present invention is 97%, which is 92% higher than that of the micromixer without the swirl element. The results show that: the cyclone element strengthens the fluid mixing process and improves the efficiency.
The above description is only a few examples of the present invention and is not intended to limit the present invention in any way, and any person skilled in the art may make equivalent changes to the above-described embodiments without departing from the scope of the present invention.
For example, the invention is not limited to the number of the feeding units, and the number of the feeding units can be increased or decreased according to the actual requirement of the number of the mixed materials, and the feeding unit material holes are distributed correspondingly.
Without departing from the scope of the present invention, it is intended that the present invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, equivalent arrangements and adaptations of the embodiments described herein.
Claims (5)
1. The utility model provides a little blender is reinforceed to passive whirl of high flux, includes bottom feeding distributor, middle part feeding distributor, mixing chamber body, microchannel reposition of redundant personnel component and the mixing chamber upper cover plate that connects gradually, its characterized in that: the bottom feeding distributor comprises a bottom feeding cavity communicated with the feeding pipe A, the middle feeding distributor comprises a middle feeding cavity communicated with the feeding pipe B, and the periphery of the middle feeding cavity is provided with a material hole A penetrating through the middle feeding distributor;
the bottom of the mixing cavity is provided with a plurality of mixing cavity material holes, and a gradually-expanding mixing cavity structure is arranged along the outlet direction, and the wall surface of the mixing cavity is a stepped wall surface;
the micro-channel flow dividing element is arranged in the mixing cavity and comprises flow dividing plates and circular plates which are sequentially stacked in a staggered mode, bulges are arranged on the periphery of the flow dividing plates, micro-channels which are gradually expanded from inside to outside are formed by the flow dividing plates and adjacent circular plates, and the adjacent flow dividing plates are arranged in a staggered mode; the micro-channel flow dividing element consisting of the flow dividing plate and the circular plate is provided with a through flow dividing element material hole at a position corresponding to the material hole of the mixing cavity; the upper cover plate of the mixing cavity is communicated with the outlet pipe;
the micro mixer further comprises a rotational flow element, one end of the rotational flow element is connected with the micro channel flow dividing element, the other end of the rotational flow element is connected with the upper cover plate, and the rotational flow element adopts a structure that a plurality of rotational flow blades are arranged on a rotational flow bottom plate;
the number of steps of the step wall surface is 3-10, the height is 0.5-5mm, and the width is 0.1-5mm;
the number of the flow dividing plates is 10-500, the protrusions on the flow dividing plates are elliptical, circular or triangular, the number of the protrusions is n, and the staggered angle between the adjacent flow dividing plates is 180/n degrees; wherein n is an even number from 6 to 50;
the thickness of the flow dividing plate is 10-1000 mu m, and the height h between the top end of the bulge and the center of the material hole of the flow dividing element is 5-20 mm; the thickness of the circular plate is 10-1000 mu m, and the diameter is 10-300mm.
2. A high throughput passive cyclone-intensified micromixer according to claim 1, wherein: the maximum equivalent diameter of the splitter plate is no greater than the diameter of the circular plate.
3. A high throughput passive cyclone-intensified micromixer according to claim 1, wherein: the equivalent diameter of the material hole of the flow dividing element is 0.5-20mm.
4. A high throughput passive cyclone-intensified micromixer according to claim 1, wherein: the swirl element comprises at least 3 swirl blades which are arc-shaped or straight-line-shaped.
5. A high throughput passive cyclone-intensified micromixer according to claim 4, wherein: the thickness of the cyclone blade is 0.3-5mm, the height is 2-50mm, and the diameter of the cyclone bottom plate is not larger than that of the circular plate.
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| CN202210913993.6A CN115253834B (en) | 2022-08-01 | 2022-08-01 | High-flux passive type rotational flow reinforced micro-mixer |
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| CN202210913993.6A CN115253834B (en) | 2022-08-01 | 2022-08-01 | High-flux passive type rotational flow reinforced micro-mixer |
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