Multi-phase micro-mixing structure

Abstract

The invention provides a multiphase micro-mixing structure which comprises an all-phase fluid leading-in structure and a multiphase mixing structure which are integrally formed, the multiphase mixing structure comprises a pre-mixing area and a strong mixing area which are sequentially communicated in the fluid flowing direction, and multiphase mixed fluid outlets are formed in the peripheral side of the strong mixing area. The strong mixing area is arranged in a rotor rotating at a high speed, and is used for performing high-shear and supergravity rotation on premixed fluid from the premixing area to achieve micro mixing; and each phase fluid leading-in structure is communicated with the pre-mixing area. By highly integrating the fluid inlet, the fluid outlet, the pre-mixing area and the strong mixing area, the reactor has the advantages of compact structure, remarkable mixing and mass transfer effects and the like, and a safe and efficient solution is provided for toxic, harmful and other high-risk reaction and mixing processes.

Description

A multiphase micro-mixing structure Technical Field

[0001] This invention relates to the field of fluid mixing and chemical process enhancement technology, specifically to a multiphase micro-mixing structure, which is particularly suitable for applications requiring efficient and uniform mixing and enhanced mass transfer of gas, liquid, and solid multiphase media. Background Technology

[0002] In industrial processes such as chemical engineering, pharmaceuticals, environmental protection, and materials synthesis, efficient mixing and mass transfer of multiphase fluids are key factors affecting reaction rates, product selectivity, and process energy consumption. Based on the scale of mixing, it can be divided into macro-mixing and micro-mixing.

[0003] Macroscopic mixing refers to the process by which materials tend to be roughly uniform on a device scale through large-scale flow (such as bulk convection and turbulent diffusion), with the mixing scale typically ranging from millimeters to centimeters. Microscopic mixing, on the other hand, refers to the uniform dispersion of materials at the molecular or micrometer scale, and is the final step that determines the contact probability of reactants and the selectivity of the reaction.

[0004] Traditional mixing equipment (such as mechanically stirred tanks and inline mixers) primarily relies on macroscopic turbulence for mixing. The input energy is often dissipated in large-scale vortices, making it difficult to effectively transfer to the dissipation scale (i.e., the microscopic mixing scale). Therefore, in fast-reaction systems, the macroscopic mixing rate often becomes a limiting factor, easily leading to problems such as excessively high local concentrations of reactants, increased side reactions, and wider product distribution. Especially for hazardous reactions involving toxic or harmful substances or highly exothermic reactions, insufficient macroscopic mixing can trigger runaway reactions, localized overheating, and safety accidents.

[0005] In contrast, micro-mixing, by enhancing the uniformity of material dispersion at the smallest scale, can significantly improve reaction efficiency, selectivity, and process safety, and is one of the core approaches to achieving chemical process intensification.

[0006] To enhance micro-mixing, hypergravity technology has emerged. Hypergravity beds (such as rotating packed beds) are a typical example. They generate a high-intensity centrifugal force field (i.e., a hypergravity field) through high-speed rotor rotation, stretching the liquid into extremely thin liquid films, filaments, or droplets under extremely high acceleration, thereby significantly expanding the phase interface area and reducing mass transfer resistance. However, existing hypergravity devices still have certain limitations. Most devices focus primarily on enhancing gas-liquid mass transfer. For complex systems requiring pre-dispersion, multi-stage shearing, or involving the coexistence of gas-liquid-solid multiphase systems, a pre-mixing unit is often required, resulting in low system integration.

[0007] Therefore, the industry urgently needs a new type of hybrid structure that can deeply integrate the extreme transmission enhancement effect of the supergravity field with functions such as pre-dispersion, multi-level shearing and microscale homogenization for multiphase media. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a multiphase micro-mixing structure that achieves enhanced mixing from macro to micro and from inlet to outlet within a single device. It provides an inherently safe, efficient, and compact solution, especially for high-risk and high-requirement reaction processes; it is highly integrated, has high mixing efficiency, and good safety.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a multiphase micro-mixing structure, comprising an integrally formed multiphase fluid inlet structure and a multiphase mixing structure, wherein the multiphase mixing structure includes a premixing zone and a strong mixing zone connected sequentially along the fluid flow direction, wherein the strong mixing zone is provided with multiphase mixed fluid outlets on its four periphery, and wherein the strong mixing zone is located inside a high-speed rotating rotor, wherein the strong mixing zone is used to subject the premixed fluid from the premixing zone to high shear and hypergravity rotation to achieve micro-mixing; each phase fluid inlet structure is connected to the premixing zone.

[0010] Furthermore, the strong mixing zone includes multiple micro-mixing units arranged in series along the fluid flow direction. Each of the multiple micro-mixing units includes a microchannel structure and an orifice plate structure arranged in series along the fluid flow direction. The outlet of the multiphase mixed fluid is a small hole in the orifice plate structure.

[0011] Furthermore, the microchannel structure is a Venturi channel array, which comprises a microchannel array and a Venturi structure disposed within each microchannel.

[0012] Furthermore, the Venturi channel array is arranged in a ring, and the microchannel array is surrounded by partitions that are arranged in a ring and extend in the radial direction.

[0013] Furthermore, the incident angle α of the Venturi structure blade is 15~20º, and the throat diameter ratio d v / D v =1 / 4~1 / 5, divergence angle β=10~15º.

[0014] Furthermore, the premixing zone is an annular chamber. Different enhanced mixing components can also be added to the premixing zone.

[0015] Furthermore, the fluid introduction structure includes a liquid introduction structure and a gas introduction structure. The liquid introduction structure is provided with a liquid rotation acceleration structure, which includes multiple main blades evenly distributed in a circle. The gas introduction structure is rotatably configured.

[0016] Furthermore, the multiphase micro-mixing structure also includes a shell, which comprises a fluid inlet cavity, a multiphase mixing cavity, and a hollow rotating shaft. A liquid / solid fluid inlet is provided on the fluid inlet cavity, and the liquid rotation acceleration structure is disposed in the fluid inlet cavity. The multiphase mixing cavity is an annular cavity with a completely open inner ring surface. The premixing zone and the strong mixing zone are sequentially disposed within the annular cavity, and the fluid inlet cavity is located directly in front of the premixing zone. The front part of the hollow rotating shaft passes through the multiphase mixing cavity and extends into the fluid inlet cavity. The main blade connects the hollow rotating shaft and the inner sidewall of the fluid inlet cavity. The inner ring sidewall of the annular cavity is fixedly connected to the sidewall of the hollow rotating shaft. A gas / liquid phase inlet is provided at the bottom end of the hollow rotating shaft, and multiple annular gas / liquid inlets are provided on the sidewall of the hollow rotating shaft opposite to the inner ring surface of the multiphase mixing cavity.

[0017] Furthermore, the perforated plate structure comprises an annular outer wall of a cavity with multiple small holes and an annular plate with multiple small holes located inside the multiphase mixing cavity. The annular plate is spaced apart from the annular outer wall of the cavity, and the small holes on the plate are staggered from the small holes on the annular outer wall of the cavity. The diameter of the small holes is 0.4 mm to 1.1 mm.

[0018] Furthermore, multiple evenly distributed keyways are provided on the lower sidewall of the hollow rotating shaft.

[0019] The multiphase micro-mixing structure provided by this invention achieves full-process mixing control from the millimeter scale to the micrometer and even the molecular scale through a series design of initial dispersion in the premixing zone and multi-level micro-fragmentation in the strong mixing zone, combined with global enhancement of the hypergravity field. The mixing efficiency and uniformity are far superior to traditional macro-mixing equipment and single-function hypergravity beds.

[0020] With a highly integrated and compact structure, it innovatively integrates multiple unit operations such as separate feeding, premixing, Venturi effect, microchannel shearing and supergravity field generation into a single rotating rotor, replacing the complex system that requires multiple devices in series in the past. This significantly reduces the size of the equipment and simplifies the process.

[0021] The integrated, sealed rotating structure significantly reduces the risk of leakage, making it particularly suitable for handling toxic, harmful, flammable, explosive, or highly reactive media. The synergy between the hypergravity field and multiple microscopic mixing mechanisms results in an order-of-magnitude increase in mass transfer and mixing rates, significantly shortening reaction time and improving the safety, efficiency, and economy of the process.

[0022] By adjusting the rotation speed, the configuration of the micro-mixing unit (such as the Venturi throat diameter and microchannel size), and the inlet and outlet forms, it can flexibly adapt to various mixing systems such as gas-liquid, liquid-liquid, and gas-liquid-solid, as well as different process requirements, showing broad application prospects. Specifically, in liquid-liquid mixing, the two liquids are introduced from the gas / liquid phase inlet and the liquid / solid fluid inlet, respectively; in gas-liquid-solid mixing, the liquid-solid phase is introduced from the liquid / solid fluid inlet, and the gas phase is introduced from the gas / liquid phase inlet.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses high-density fluid to shear low-density fluid. Because the high-density fluid has a large mass and a large flow energy, the shearing efficiency is high. The present invention ingeniously improves the energy of the high-density fluid; 2. The strong mixing zone of the present invention adopts a variety of micro-mixing structures; 3. The mixing reaction structure in the present invention is simple, low in cost, and easy to operate; 4. The present invention has an ingenious structure and is suitable for toxic and harmful multiphase reactions, reducing safety risks. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the internal structure of the multiphase micro-mixed structure described in this invention.

[0025] Figure 2 is a cross-sectional top view of the multiphase micro-mixed structure described in this invention.

[0026] Figure 3 is a schematic diagram of the multiphase micro-mixed structure described in this invention.

[0027] Figure 4 is a diagram showing the partial dimensional parameters of the Venturi structure described in this invention.

[0028] Figure 5 is a schematic diagram of material mixing of the multiphase microstructure described in this invention.

[0029] Among them, 1-shell, 2-Venturi structure, 3-main blade, 4-microchannel, 5-main flow channel, 6-gas / liquid inlet, 7-annular collecting cavity, 8-annular gas / liquid inlet, 9-premixing zone, 10-keyway, 11-liquid / solid fluid inlet, 12-multiphase mixed fluid outlet, 13-strong mixing zone, 14-orifice plate structure, 15-partition, 41-constricting inlet section, 42-throat, 43-expanding outlet section, 101-fluid inlet cavity, 102-multiphase mixing, 103-hollow rotating shaft Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0031] As shown in Figures 1-5, a multiphase micro-mixing structure includes an integrally formed fluid introduction structure for each phase and a multiphase mixing structure. The multiphase mixing structure includes a premixing zone 9 and a strong mixing zone 13 that are sequentially connected along the fluid flow direction. The strong mixing zone 13 has multiphase mixed fluid outlets on its four periphery. The strong mixing zone 13 is located inside a high-speed rotating rotor. The strong mixing zone 13 is used to subject the premixed fluid from the premixing zone 9 to high shear and hypergravity rotation to achieve micro-mixing. Each fluid introduction structure is connected to the premixing zone 9.

[0032] Furthermore, the strong mixing zone 13 includes multiple micro-mixing units arranged in series along the fluid flow direction. Each of the multiple micro-mixing units includes a microchannel structure and an orifice plate structure 14 arranged in series along the fluid flow direction. The multiphase mixed fluid outlet 12 is a small hole in the orifice plate structure 14 to achieve uniform and stable discharge of the fluid. Under the action of hypergravity, the mixed fluid is accelerated and sheared through the small hole and ejected in the form of a high-speed jet, thereby achieving a uniform mixing product.

[0033] All or part of the structure of the strong mixing zone 13 is located inside the high-speed rotating rotor, so that the fluid flowing through the zone is simultaneously subjected to the combined effects of high shear force and hypergravity field.

[0034] In some embodiments, the microchannel structure is a Venturi channel array, which comprises a microchannel array and a Venturi structure 2 disposed within each microchannel 4; the Venturi channel array is arranged in a ring, and the microchannel array is surrounded by a ring-shaped baffle 15 extending radially. The Venturi structure 2 is used to generate local negative pressure and cavitation effect through throat acceleration, achieving initial gas-liquid fragmentation; the microchannel array is used to divide the fluid to achieve microscale dispersion.

[0035] The microchannel 4 has a hydrodynamically optimized cross-sectional shape, including a tapered inlet section 41 near the premixing zone, a minimum-sized throat 42 located in the middle of the channel, and a tapered outlet section 43 near the outer periphery, forming a primary micro-mixing unit.

[0036] Wherein, when the incident angle α of the Venturi structure blade 2 is 15~20º, the throat diameter ratio d v / D v The effect is best when the divergence angle β = 10~15º, which is 1 / 4~1 / 5.

[0037] By adjusting the rotation speed, the configuration of the micro-mixing units (such as the Venturi throat diameter and microchannel size), and the inlet and outlet forms, it can flexibly adapt to various mixing systems such as gas-liquid, liquid-liquid, and gas-liquid-solid, as well as different process requirements, and has broad application prospects. In this design, the solid and liquid phases are mixed and then enter the structure through the liquid inlet.

[0038] Furthermore, the premixing zone 9 is an annular chamber or a tapered chamber. Different enhanced mixing components can also be added to the premixing zone 9. In this region, the accelerated liquid phase encounters the introduced gas or liquid phase, and under the guidance of the hypergravity field formed by high-speed rotation and the microfluidic structure, preliminary collision, shearing, and mixing occur.

[0039] Furthermore, the fluid introduction structure includes a liquid introduction structure and a gas introduction structure. The liquid introduction structure includes a liquid rotation acceleration structure (e.g., a spiral guide channel or a tangential injection pipe) to give the liquid phase rotational momentum upon entry. More specifically, the liquid rotation acceleration structure includes multiple circularly distributed main blades 3; the gas introduction structure is rotatably configured. The main blades 3 can be twisted blades, spiral blades, straight blades, etc.

[0040] More specifically, the multiphase micro-mixing structure further includes a shell 1, which includes a fluid inlet cavity 101, a multiphase mixing cavity 102, and a hollow rotating shaft 103. A liquid / solid fluid inlet 11 is provided on the fluid inlet cavity 101, and the liquid rotation acceleration structure is disposed in the fluid inlet cavity 101, forming a main flow channel 5 within the fluid inlet cavity 101. The multiphase mixing cavity 102 is an annular cavity with a completely open inner ring surface. The premixing zone 9 and the strong mixing zone 13 are sequentially disposed within the annular cavity, and the fluid inlet cavity 101 is located directly in front of and above the premixing zone 9. The upper front part of the hollow rotating shaft 103 passes through the multiphase mixing cavity 102 and extends into the fluid inlet cavity 101. The main blade 3 connects the hollow rotating shaft 103 and the inner sidewall of the fluid inlet cavity 101. The inner annular sidewall of the annular cavity is fixedly connected to the sidewall of the hollow rotating shaft 103. The inner cavity of the hollow rotating shaft 103 is a gas accumulation cavity. The bottom end of the hollow rotating shaft 103 is provided with a gas / liquid phase inlet 6, and its internal cavity forms a gas annular collection cavity 7. Multiple annular gas / liquid inlets 8 are provided on the sidewall of the hollow rotating shaft 103 opposite to the inner annular surface of the multiphase mixing cavity 102. Multiple evenly distributed keyways 10 are formed on the lower sidewall of the hollow rotating shaft 103.

[0041] The shell 1, fluid introduction structure, premixing zone 9, and strong mixing zone 13 are manufactured using a one-piece molding process, forming an integrated rotating rotor. This integrated, sealed rotating structure significantly reduces the risk of leakage, making it particularly suitable for handling toxic, harmful, flammable, explosive, or highly reactive media. The synergy between the hypergravity field and multiple microscopic mixing mechanisms results in an order-of-magnitude increase in mass transfer and mixing rates, significantly shortening reaction time and improving the safety, efficiency, and economy of the process.

[0042] Understandably, when the shell 1 rotates at high speed, a hypergravity field environment is formed inside it, so that the fluid flowing through the premixing zone 9 and the strong mixing zone 13 is simultaneously subjected to the combined effect of centrifugal force and shear force generated by the micro-mixing unit.

[0043] The perforated plate structure 14 consists of an annular outer wall with multiple small holes and an annular plate with multiple small holes located inside the multiphase mixing chamber 102. The annular plate is spaced apart from the annular outer wall, and the small holes on the plate are staggered from the small holes on the annular outer wall. The diameter of the small holes is 0.4 mm to 1.1 mm to reduce blockage by foreign objects.

[0044] When the entire structure rotates at high speed, a hypergravity environment is created inside. The multiphase media (gas, liquid, and possibly solid phases) flow sequentially through the following stages: premixing zone: to achieve initial dispersion of gas and liquid; Venturi channel array: to complete primary shearing and mixing; orifice plate: to perform secondary transport and final high shearing.

[0045] Ultimately, the mixed fluid achieves uniform dispersion at the microscale at the outer edge of the rotor or at the outlet. This integrated design compactly integrates premixing, multi-stage micromixing, and the enhanced effect of the hypergravity field into a single rotating component, achieving an efficient, uniform, and safe multiphase mixing process.

[0046] The enhanced microscopic mixing of gas-liquid-solid three-phase media is achieved through a rotating-jet synergistic dynamic mixing structure. This structure, utilizing highly integrated rotating mixing units, deeply integrates the hypergravity field enhancement effect with a multi-level microscopic mixing mechanism, achieving extreme dispersion and efficient mixing of multiphase media. Its core feature lies in the multi-level coupling of the hypergravity field effect generated by high-speed rotation with the jet shearing effect of the built-in microscopic mixing units, such as the Venturi blades and microchannels, through an integrated flow channel design.

[0047] In this hybrid structure, a premixing chamber and a strong mixing zone 13 are sequentially arranged in series inside the high-speed rotating integral rotor, forming a multi-stage crushing and mixing interface. Gas and liquid phases (or solid slurry) enter the high-speed rotating rotor through their respective independent inlets. The gas phase enters along the axial or centrally arranged gas / liquid inlet 6, concentrates in the gas collection chamber, and is then introduced into the premixing zone 9 through an annular gas / liquid inlet. The liquid phase enters through a tangential inlet with a rotational acceleration structure, and is accelerated into the premixing zone 9 under the influence of a hypergravity field. Within the premixing zone 9, the gas and liquid phases undergo initial collisions and turbulent dispersion; subsequently, the mixed fluid enters the strong mixing zone 13 and flows sequentially through multiple built-in micro-mixing units.

[0048] The strong mixing zone 13 integrates micro-mixing units such as a tapered and expanding Venturi structure. When the fluid flows through the Venturi throat, the flow velocity increases sharply and the pressure drops abruptly, creating a local negative pressure and cavitation effect, achieving initial shearing and fragmentation of the gas phase in the high-speed liquid phase. Subsequently, the mixture enters micro-structural units such as microchannel arrays, where it is further divided into micron- or even submicron-scale fluid units under hypergravity conditions, completing the final micro-homogenization mixing.

[0049] This highly integrated multiphase micro-mixing structure ensures that the fluid undergoes multiple physical processes, including collision, stretching, shearing, and splitting, under hypergravity rotation conditions, thereby achieving uniform mixing across the entire scale from macro to micro. This structure is particularly suitable for multiphase reaction and mixing processes that require high efficiency, safety, and compactness.

[0050] For a gas-liquid-solid three-phase system, solid particles are also efficiently suspended, dispersed, and uniformly encapsulated in the fluid medium during this process. The multiphase fluid, having completed micro-mixing, is then discharged as a high-speed jet through a tangential outlet at the rotor's edge or end, driven by a powerful centrifugal force. Throughout the process, the hypergravity environment significantly enhances the mass transfer rate, while the integrated multi-stage mixing design ensures uniform mixing across the entire scale, from macro to micro.

[0051] The multiphase micro-mixing structure of the present invention was used in fermentation experiments, and the examples are as follows. Example 1

[0052] In this example of a fermentation experiment to produce hydroxytryptophan, the fermentation medium was first sterilized by moist heat, followed by inoculation with a seed culture for hydroxytryptophan production. Sterile air was introduced through the gas inlet of the apparatus, while the sterile medium and seed culture entered through the liquid inlet. Driven by external power, they were accelerated by rotation to form a three-phase mixture of gas, liquid, and solid at a certain flow rate. This three-phase mixture first underwent preliminary mixing in the premixing zone 9, and then entered the strong mixing zone 13, where efficient mass transfer and biochemical reactions were achieved. The mixture after the reaction and any unreacted parts were finally discharged from the multiphase mixture outlet of the apparatus and could be reintroduced for a cyclic reaction.

[0053] Under the fermentation conditions set in this apparatus, the culture temperature was 37°C, the pH was maintained at 7.0, and the dissolved oxygen (DO) was not lower than 20%. The final fermentation results showed that the OD600 reached a maximum of 159.2, and the hydroxytryptophan concentration increased to 38 g / L, approximately twice that of a conventional reactor. Example 2

[0054] In this experiment, the fermentation medium for producing docosahexaenoic acid (DHA) by *Schizochytrium* was first sterilized by moist heat, followed by inoculation with *Schizochytrium* seed culture. Sterile air was introduced through the gas inlet of the apparatus, while the sterile medium and seed culture entered through the liquid inlet. Driven by external power, the mixture was accelerated by rotation to form a three-phase mixture of gas, liquid, and solid at a certain flow rate. This three-phase mixture first underwent preliminary mixing in the premixing zone 9, and then entered the strong mixing zone 13, where efficient mass transfer and biochemical reactions were achieved. The mixture after the reaction and any unreacted residues were finally discharged from the multiphase mixture outlet of the apparatus and could be reintroduced for cyclic reactions.

[0055] Under the fermentation conditions set in this device, the culture temperature was 30℃, the pH was maintained at 7.0, and the dissolved oxygen (DO) was not lower than 20%. The final fermentation results showed that the cell dry weight (DCW) increased by 46.99%, and the maximum specific growth rate (DHA) increased by 24.77%. The yields of oil and DHA also increased, reaching a maximum of 71.55±1.20 g / L and 31.98±1.30 g / L, respectively, representing increases of 53.62% and 65.50% compared to conventional reactors. Example 3

[0056] In this experiment on the production of lysine decarboxylase by *E. coli* fermentation, the fermentation medium was first sterilized by moist heat, followed by inoculation with *E. coli* seed culture. Sterile air was introduced through the gas inlet of the apparatus, while the sterile medium and seed culture entered through the liquid inlet. Driven by external power, they were accelerated by rotation to form a three-phase mixture of gas, liquid, and solid at a certain flow rate. This three-phase mixture first underwent preliminary mixing in the premixing zone 9, and then entered the strong mixing zone 13, where efficient mass transfer and biochemical reactions were achieved. The reaction was completed, and any incompletely reacted mixture was discharged from the multiphase mixture outlet of the apparatus, and could be reintroduced into the apparatus for recycling.

[0057] Under the fermentation conditions set in this device, the culture temperature was 37℃, the pH was maintained at 7.0, and the dissolved oxygen (DO) was not lower than 20%. The final fermentation results showed that the highest OD600 reached 112.7, and the enzyme activity reached 2487.52 U·OD. -1 This represents a 32.10% improvement over conventional reactors.

[0058] Those skilled in the art should understand that the above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multiphase micro-mixed structure, characterized in that, It includes an integrally formed fluid inlet structure and a multiphase mixing structure. The multiphase mixing structure includes a premixing zone and a strong mixing zone that are connected sequentially along the fluid flow direction. The strong mixing zone has multiphase mixed fluid outlets on its four sides. The strong mixing zone is located inside a high-speed rotating rotor. The strong mixing zone is used to perform high-shear and high-gravity rotation on the premixed fluid from the premixing zone to achieve micro-mixing. Each fluid inlet structure is connected to the premixing zone.

2. The multiphase micro-mixed structure according to claim 1, characterized in that, The strong mixing zone includes multiple micro-mixing units arranged in series along the fluid flow direction. Each of the multiple micro-mixing units includes a microchannel structure and an orifice plate structure arranged in series along the fluid flow direction. The outlet of the multiphase mixed fluid is a small hole in the orifice plate structure.

3. The multiphase micro-mixed structure according to claim 2, characterized in that, The microchannel structure is a Venturi channel array, which consists of a microchannel array and a Venturi structure disposed in each microchannel.

4. The multiphase micro-mixed structure according to claim 3, characterized in that, The Venturi channel array is arranged in a ring, and the microchannel array is surrounded by partitions that are arranged in a ring and extend in the radial direction.

5. The multiphase micro-mixed structure according to claim 3 or 4, characterized in that, The Venturi structure blade has an incident angle α = 15~20º and a throat diameter ratio d. v / D v =1 / 4~1 / 5, divergence angle β=10~15º.

6. The multiphase micro-mixing structure according to claim 3 or 4, characterized in that, The premixing zone is an annular chamber or a tapering chamber.

7. The multiphase micro-mixed structure according to claim 6, characterized in that, The fluid introduction structure includes a liquid introduction structure and a gas introduction structure. The liquid introduction structure is provided with a liquid rotation acceleration structure, which includes multiple main blades evenly distributed in a circle. The gas introduction structure is rotatably configured.

8. The multiphase micro-mixed structure according to claim 7, characterized in that, The multiphase micro-mixing structure further includes a shell, which comprises a fluid inlet cavity, a multiphase mixing cavity, and a hollow rotating shaft. A liquid / solid fluid inlet is provided on the fluid inlet cavity, and the liquid rotation acceleration structure is disposed within the fluid inlet cavity. The multiphase mixing cavity is an annular cavity with a completely open inner ring surface. The premixing zone and the strong mixing zone are sequentially disposed within the annular cavity, and the fluid inlet cavity is located directly in front of the premixing zone. The front part of the hollow rotating shaft passes through the multiphase mixing cavity and extends into the fluid inlet cavity. The main blade is fixedly connected to the side wall of the hollow rotating shaft, and the side wall of the hollow rotating shaft is fixedly connected to the inner side wall of the fluid inlet cavity. The inner ring side wall of the annular cavity is fixedly connected to the side wall of the hollow rotating shaft. A gas / liquid phase inlet is provided at the bottom end of the hollow rotating shaft, and multiple annular gas / liquid inlets are provided on the side wall of the hollow rotating shaft opposite to the inner ring surface of the multiphase mixing cavity.

9. The multiphase micro-mixed structure according to claim 8, characterized in that, The perforated plate structure consists of an annular outer wall with multiple small holes and an annular plate with multiple small holes located inside the multiphase mixing chamber. The annular plate is spaced apart from the annular outer wall, and the small holes on the plate are staggered from the small holes on the annular outer wall. The diameter of the small holes is 0.4 mm to 1.1 mm.

10. The multiphase micro-mixed structure according to claim 8, characterized in that, Multiple evenly distributed keyways are provided on the lower side wall of the hollow rotating shaft.

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