Disc type circumferential multi-nozzle bidirectional hedging homogenizing device

Abstract

The invention belongs to the technical field of fluid mixing and homogenizing, and relates to a disc-type circumferential multi-nozzle bidirectional hedging homogenizing device, which comprises a disc-shaped base body, an annular fluid channel is arranged in the disc-shaped base body, and a plurality of nozzle mounting cavities are uniformly distributed on the outer circumference of the disc-shaped base body; a micropore nozzle is arranged in each nozzle mounting cavity, and the axis of each nozzle is perpendicular to the axis of the disc-shaped base body; the driving mechanism is used for driving the disc-shaped base body to rotate around a central shaft; and the fluid conveying system is communicated with the annular fluid channel of the disc-shaped base body and is used for pumping a material to be treated into the disc-shaped base body. Compared with an existing homogenizing process, the method has the advantages that homogenizing treatment of a coupled jet flow field is achieved, high efficiency is achieved in the aspect of nano-dispersion, and the dispersion time of part of nano-particles is shortened by 50%-70%; the dynamic temperature regulation and control system achieves comprehensive breakthrough in the aspects of heat management and applicability, and the influence caused by machine temperature rise is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid mixing and homogenization, and relates to a disk-type circumferential multi-nozzle two-way counter-jet homogenization device, which is particularly suitable for the dispersion of nanomaterials, the emulsification of biopharmaceuticals, and the fine processing in the food industry. Background Art

[0002] A homogenizer is a device that breaks and evenly disperses particles in liquid materials through mechanical force. With the development of industry demands, homogenizers have been widely used in food and beverage, biopharmaceuticals, chemical materials, new energy, etc. Currently, the homogenizers on the market mainly rely on high-pressure jets and wall collisions, and there are problems such as high energy consumption, easy blockage of high-solid-content materials, single-direction jet or single centrifugal field action, insufficient turbulence intensity, and easy local overheating of heat-sensitive materials, and still need to be improved. Summary of the Invention

[0003] In view of the following limitations of the current homogenization technology, high energy consumption: traditional high-pressure homogenizers rely on ultra-high pressure (>50 Mpa) to force fluids through narrow gaps, and the energy consumption accounts for 40%-60% of the total cost; uneven mixing: due to insufficient turbulence intensity of static mixers or single-nozzle jet devices, it is difficult to achieve uniform dispersion of nanoparticles (<100 nm), resulting in poor emulsion stability (stratification time <24 h), and high-solid-content materials are prone to blockage; damage to heat-sensitive materials: local temperature rise (ΔT>10 °C) caused by high-speed shear or cavitation effect destroys bioactive components; based on this, the present invention introduces a homogenization device with low energy consumption, high shear, and controllable temperature rise.

[0004] The technical solution of the present invention is as follows:

[0005] A disk-type circumferential multi-nozzle two-way counter-jet homogenization device, comprising a disk-shaped base, an annular fluid channel, a nozzle mounting cavity, a two-way counter-jet nozzle module, a microporous nozzle, a jet counter-jet area, a driving mechanism, a fluid delivery system, and a temperature control unit;

[0006] The disk-shaped base is a disk-shaped metal structure with a diameter of 200-800 mm and a wall thickness of 20-50 mm. Its bottom is closed and provided with a shaft hole, and several flow channels are evenly distributed circumferentially; the shaft hole is rigidly connected to the drive shaft through a keyway or flange structure to transmit rotational power to realize the rotation of the disk-shaped base around its axis; the annular fluid channel is composed of a plurality of cavity structures evenly distributed around the central axis of the disk-shaped base, and the number is the same as that of the microporous nozzles. A single cavity is located in the near-edge area of the disk-shaped base. The outer wall of the cavity channel is 10-20 mm away from the edge of the disk body. The cross-section is circular, with a diameter of 20-30 mm and a vertical height of 5-100 mm. The cavity extends radially from the main channel to each nozzle mounting cavity, and the main channel is the outlet of the material fluid;

[0007] The two-way counter-jet nozzle module consists of a set of nozzle mounting cavities and microporous nozzles that face each other and have coincident central axes. Multiple groups of two-way counter-jet nozzle modules are evenly distributed on the circumference of the disc-shaped base to form a functional unit for material dispersion; the jet counter-jet area is the area where the material in the disc-shaped base completes homogenization and mixing under the combined action of centrifugal force and jet counter-jet.

[0008] The nozzle mounting cavity is a transition structure between the annular fluid channel and the microporous nozzle. Its flow channel is an arc-shaped tapered flow channel, which gradually narrows from the inlet to the outlet of the nozzle mounting cavity, with a contraction ratio of 1:1.5 to 1:3 and a contraction curvature radius of 15 to 20 mm;

[0009] The microporous nozzles are connected to the nozzle mounting cavities, are evenly distributed circumferentially along the inner wall of the disc-shaped base at equal angles, with an even distribution density of 12 to 24 and an even number; the injection axis angle between any two adjacent microporous nozzles is 15° to 30° and the axis is perpendicular to the axis of the disc-shaped base;

[0010] The microporous nozzle is a multi-stage high-efficiency nozzle, which is, in the direction of material flow, a connecting part, a contraction part, a throat part, and a diffusion part. The aperture of the contraction part contracts in an arc shape, with a contraction angle of 20° to 30°, the throat diameter is 0.5 to 1 mm, the length is 4.5 to 6 mm, the diffusion part expands in a conical shape, with an expansion angle of 15° to 20°, and the length is 7.5 to 9 mm;

[0011] The driving mechanism is a variable-frequency motor or magnetic levitation drive. The motor shaft is connected to the shaft hole of the disc-shaped base, and the speed regulation range is 500 to 5000 rpm and can be dynamically adjusted according to the material viscosity. The variable-frequency motor has a power of 2 to 10 kW.

[0012] The fluid delivery system consists of a high-pressure piston pump, a flow regulating valve, etc. Among them, the working pressure of the high-pressure piston pump is 0.5 to 10 MPa, and the flow range is 10 to 1000 L / h. Its pressure and flow are set according to the viscosity and dispersion effect of the material.

[0013] The temperature control unit is an integrated cooling flow channel inside the disc-shaped base, with a temperature control accuracy of ±1°C, reducing the system temperature rise and increased heat loss caused by jet impact. The temperature control unit adjusts the flow rate of the cooling medium through the PID algorithm.

[0014] By adopting this solution: The material is pumped from the storage tank by a high-pressure piston pump into the pipeline, converting the pressure energy into jet kinetic energy to make two jets collide head-on, and using high-pressure impact and cavitation effects to preliminarily break the particles;

[0015] Among them, in the feeding stage: the material is pumped into the annular fluid channel of the disc-shaped matrix through the fluid conveying system, and is distributed to each nozzle installation cavity along the pipeline. The high-pressure plunger pump can ensure the high-pressure injection ability and stable flow rate of the material; subsequently, the material undergoes secondary contraction transition, throat, and diffusion section in the nozzle installation cavity and the microporous nozzle to achieve preliminary particle crushing, and is ejected from the outlet of the microporous nozzle after static pressure recovery; in the jet injection stage: the high-energy fluid action area formed by the intersection and collision of two or more high-speed jets in a specific area has a high instantaneous energy density. The material forms a high-speed jet (speed 20 - 50 m / s) through the microporous nozzle. The jets of adjacent two microporous nozzles form an alternating impact area in the disc-shaped matrix, generating a strong turbulent flow field with an instantaneous Reynolds number > 5000. The jet material particles are further crushed and homogenized after being collided. The centrifugal force in the disc-shaped matrix is superimposed with the jet impact kinetic energy, enabling the material to undergo multi-directional shearing, collision, and cavitation effects, realizing refined homogenization with a particle size distribution ≤ 100 nm. During the whole process, the temperature control unit monitors the material temperature in real time and maintains the processing temperature within ±2°C of the set value through the cooling channel.

[0016] Furthermore, the pipeline of the annular fluid channel adopts a streamline transition: the connection between the inlet and the branch flow channel uses an arc chamfer, and the chamfer radius is about 0.2 times the cross-sectional diameter. Moreover, the disc-shaped matrix and the surface of the annular fluid channel are provided with wear-resistant coatings and surface polishing treatment.

[0017] The reason for adopting this technical solution: the streamline transition ensures the uniform distribution of the material and can avoid the flow separation of the material at the inlet / outlet; stainless steel has a certain yield strength, and the silicon carbide coating has the synergistic optimization properties of corrosion resistance and wear resistance. The surface with high surface finish can reduce the blockage of material particles and energy consumption.

[0018] As a further preferred embodiment of the present invention, the nozzle installation cavity is connected to the contraction part of the microporous nozzle to form a double-arc continuous contraction section.

[0019] The reason for adopting this technical solution: compared with the traditional trapezoidal transition, the flow velocity gradient of the double-arc continuous contraction is more optimized. The preliminary contraction of the nozzle installation cavity increases the flow velocity from 5 m / s to 10 m / s, and the secondary contraction of the microporous nozzle further increases the flow velocity to 30 m / s. In this way, the two-stage arc contraction acceleration avoids the flow separation caused by a single-stage high contraction ratio, the shear rate is increased, the flow velocity distribution and particle force are made uniform, and the dispersion effect is increased by 50%. At the same time, the double-arc diversion makes the particles gather towards the center of the flow channel, reduces the collision with the wall surface, and improves the service life of the microporous nozzle.

[0020] As a further preferred embodiment of the present invention, the micro-porous nozzle is a multi-stage high-efficiency nozzle, which includes a connecting portion, a contraction portion, a throat portion, and a diffusion portion along the material flow direction; the aperture of the contraction portion contracts in an arc shape, with a contraction angle of 20° to 30°, the diameter of the throat portion is 0.5 to 1 mm, the length is 4.5 to 6 mm, the diffusion portion expands in a conical shape, with an expansion angle of 15° to 20°, and the length is 7.5 to 9 mm;

[0021] The reason for adopting this technical solution is as follows: The contraction portion of the micro-porous nozzle converts the pressure energy of the fluid into kinetic energy by reducing the cross-sectional area, improving the flow rate, and the arc-shaped contraction can reduce fluid diversion and vortex phenomena; the throat portion determines the magnitude of the shear force, shear time, and pressure drop range of the material, and plays a preliminary crushing role on the material particles; the diffusion portion restores part of the static pressure by expanding the cross-sectional area, can reduce energy waste and outlet pressure loss, and form a stable jet.

[0022] A method for using a disk-type circumferential multi-nozzle two-way counter-jet homogenizing device is as follows:

[0023] The first step: Check the equipment before starting up, confirm that there is no residual material from the previous mixing in the homogenizer, and check the cooling liquid level and the installation and sealing conditions of the micro-porous nozzle;

[0024] The second step: Pre-cool the system, start the temperature control unit, turn on the cooling pump, adjust the system flow rate to 20 L / min, and the pressure to 0.2 MPa, ensure that the temperature of the disk-shaped matrix ≤ 35°C and the instrument readings are stable;

[0025] The third step: Start the drive mechanism, adjust the frequency converter to the lowest frequency of 10 Hz, start the drive mechanism, and gradually increase the frequency to 1500 rpm after confirming that the rotation direction is consistent with the arrow, with each increase ≤ 10%;

[0026] The fourth step: Start the fluid delivery system, open the feed valve, and set the initial feed flow rate to 5m 3 / h; Observe the pressure gauge to ensure that the inlet pressure ≤ 0.5 MPa to avoid idling and dry grinding;

[0027] The fifth step: Run and monitor, confirm that the homogenizer is running normally, regularly sample and detect the particle size, viscosity, etc. until the target particle size requirements are met;

[0028] The sixth step: Shut down, gradually reduce the speed to 10 Hz, close the feed valve, keep the temperature of the homogenizer < 40°C, circulate and rinse with a cleaning agent for 10 minutes, then turn off the main motor and the cooling pump, and lock the power switch.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] Compared with the existing homogenization process, the present invention has a homogenization treatment with a coupled jet flow field, is efficient in nano-dispersion (the dispersion time of some nano-particles is shortened by 50% - 70%), and has a dynamic temperature control system in the cavity, achieving a comprehensive breakthrough in thermal management and applicability, and reducing the impact brought by the temperature rise of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following further describes the detailed content of the present invention in conjunction with the drawings and specific embodiments.

[0032] FIG. 1(a) is a front view of the structure of the homogenizer in the specific embodiment of the present invention;

[0033] FIG. 1(b) is a top view of the structure of the homogenizer in the specific embodiment of the present invention;

[0034] Figure 2 FIG. 1(c) is a cross-sectional view of the structure of the annular pipeline inside the disc-shaped cavity in the specific embodiment of the present invention;

[0035] Figure 3 FIG. 1(d) is a partial enlarged view of a group of two-way counter-jet nozzles in the specific embodiment of the present invention;

[0036] Figure 4 FIG. 1(e) is a schematic diagram of the circumferential nozzle layout in the specific embodiment of the present invention.

[0037] The corresponding names of each part in the figure are as follows:

[0038] 10, disc-shaped base; 11, annular fluid channel; 12, nozzle installation cavity; 13, frame; 20, two-way counter-jet nozzle module; 21, micro-hole nozzle; 22, jet counter-jet area; 30, drive mechanism; 40, fluid delivery system; 41, high-pressure piston pump; 42, flow regulating valve; 50, temperature control unit. SPECIFIC EMBODIMENTS

[0039] To more clearly illustrate the technical solution of the present invention, the following further describes it in conjunction with embodiments.

[0040] Embodiment 1:

[0041] The present invention discloses a disc-type circumferential multi-nozzle two-way counter-jet homogenization device, including:

[0042] The disc-shaped substrate 10 is made of a silicon carbide ceramic coating material, with an outer diameter of 300 mm, a thickness of 30 mm, and nozzle mounting cavities 12 evenly distributed circumferentially; the inlet diameter of the nozzle mounting cavity 12 is 20 mm, and the flow channel is an arc-shaped tapered flow channel, gradually narrowing from the inlet to the outlet, with a contraction ratio of 1:1.5 and an arc-shaped contraction curvature radius of 30 mm; one end of the nozzle mounting cavity 12 is connected to the micro-nozzle 21, and the other end is connected to the annular fluid channel 11; the annular fluid channel 11 is connected to the fluid delivery system 40; among them, the inlet diameter of the micro-nozzle 21 is 10 mm, the contraction angle of the contraction part is 20°, the length is 10 mm, the throat diameter is 0.5 mm, the length is 1 mm, and the diffusion part angle is 15°, the length is 8 mm; the axes of the micro-nozzles 21 coincide with the axis of the nozzle mounting cavity 12, the angle between adjacent micro-nozzles 21 is 30°, and the number is 12; the driving mechanism 30 provides rotational power for the entire disc-shaped substrate 10 to enable the entire cavity to obtain sufficient centrifugal force; the fluid delivery system 40 is a material pumping device, one end is connected to the storage tank, and the other end is connected to the feed port through a flange to evenly pump the material into each micro-nozzle 21 to achieve counter-flushing, and the temperature control unit 50 is placed on the inner wall of the disc-shaped substrate 10 to avoid the influence of temperature rise on the material.

[0043] In practice, the specific working process is as follows: Prepare a slurry for chemical mechanical polishing, including nano-silica abrasive (10 wt%, particle size 50 nm, 500 nm after agglomeration); oxidant (0.5 wt% hydrogen peroxide); surfactant (0.2 wt% sodium dodecyl sulfate, SDS); pH regulator (NaOH solution, pH = 10.5); deionized water (the balance). Premix the above components in a stirring kettle for 30 minutes (rotation speed 500 rpm) to form a preliminary suspension, but there are the following problems: severe abrasive agglomeration (particle size 500 nm); uneven distribution of oxidant and surfactant (Zeta potential fluctuation ±10 mV).

[0044] Example 2:

[0045] Homogenize the slurry using a homogenizer, and the operation steps of the homogenizer are as follows:

[0046] 1. Check the equipment before starting, confirm that there is no residual material from the previous mixing in the homogenizer, and check the cooling liquid level and the installation and sealing conditions of the micro-nozzles 21;

[0047] 2. Pre-cool the system, start the temperature control unit 50, turn on the cooling pump, adjust the system flow rate to 20 L / min (pressure 0.2 MPa), and ensure that the temperature of the disc-shaped substrate 10 ≤ 35 °C and the instrument readings are stable;

[0048] 3. Start the driving mechanism, adjust the frequency converter to the lowest frequency of 10 Hz, start the driving motor, and gradually increase the frequency to 1500 rpm (each increase ≤ 10%) after confirming that the rotation direction is consistent with the arrow;

[0049] 4. Start the fluid delivery system 40, open the feed valve, and set the initial feed flow rate to 5 m 3 / h; Observe the pressure gauge to ensure that the inlet pressure ≤ 0.5 MPa (to avoid idling and dry grinding);

[0050] 5. Conduct operation monitoring, confirm that the homogenizer is running normally, take samples regularly to detect particle size, viscosity, etc., until the target particle size requirement is met;

[0051] 6. Shut down the machine, gradually reduce the speed to 10 Hz, close the feed valve, keep the temperature of the homogenizer < 40 °C, circulate and rinse with a cleaning agent for 10 minutes, then turn off the main motor and the cooling pump, and lock the power switch.

[0052] After homogenization, the particle size of the particles in the polishing liquid can be detected by a laser particle size analyzer, and its stability can be determined by the layering phenomenon and Zeta potential after standing for 72 h.

[0053] As described above, it is only a specific embodiment of the present invention, which is a basic description of the preferred mode of the present invention and does not limit the present invention. However, the protection scope of the present invention is not limited thereto. Any person skilled in the art, within the technical scope disclosed by the present invention and without departing from the design spirit of the present invention, makes various deformations and improvements to the technical solution of the present invention, and all should fall within the protection scope determined by the claims of the present invention patent. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A disc-type circumferential multi-nozzle two-way counter-jet homogenization device, characterized in that It includes a disc-shaped base body (10), an annular fluid channel (11), a nozzle mounting cavity (12), a two-way counter-jet nozzle module (20), a micro-hole nozzle (21), a driving mechanism (30), a fluid delivery system (40), and a temperature control unit (50); The bottom of the disc-shaped base body (10) is closed and provided with a shaft hole, and several flow channels are evenly distributed circumferentially; the shaft hole is rigidly connected to the driving shaft through a keyway or flange structure to transmit rotational power to realize the rotation of the disc-shaped base body (10) around its axis; the annular fluid channel (11) is composed of multiple cavity structures evenly distributed around the central axis of the disc-shaped base body (10), and the number is the same as that of the micro-hole nozzles (21). A single cavity is located in the near-edge area of the disc-shaped base body (10), and the cavity extends radially from the main channel to each nozzle mounting cavity (12), and the main channel is the outlet of the material fluid; The two-way counter-jet nozzle module (20) is composed of a group of nozzle mounting cavities (12) and micro-hole nozzles (21) that face each other and have coincident central axes. Multiple groups of two-way counter-jet nozzle modules (20) are evenly distributed on the circumference of the disc-shaped base body (10) to form a functional unit for material dispersion; the jet counter-jet area (22) is the area where the material in the disc-shaped base body (10) is homogenized and mixed under the combined action of centrifugal force and jet counter-jet; The nozzle mounting cavity (12) is a transition structure between the annular fluid channel (11) and the micro-hole nozzle (21). Its flow channel is an arc-shaped tapered flow channel, which gradually shrinks from the inlet to the outlet of the nozzle mounting cavity (12). The shrinkage ratio is 1:1.5 to 1:3, and the shrinkage curvature radius is 15 to 20 mm; The micro-hole nozzle (21) is connected to the nozzle mounting cavity (12), and is evenly distributed circumferentially at equal angles along the inner wall of the disc-shaped base body (10). The even distribution density is 12 to 24, and the number is even; the injection axis angle between any two adjacent micro-hole nozzles (21) is 15° to 30°, and the axis is perpendicular to the axis of the disc-shaped base body (10).

2. The circumferential multi-nozzle two-way counter-jet homogenization device of a disc type according to claim 1, wherein The micro-hole nozzle (21) includes a connecting part, a shrinking part, a throat part, and a diffusing part along the material flow direction. The aperture of the shrinking part shrinks in an arc shape, and the shrinking angle is 20° to 30°. The diameter of the throat part is 0.5 to 1 mm, and the length is 4.5 to 6 mm. The diffusing part expands in a conical shape, and the expanding angle is 15° to 20°, and the length is 7.5 to 9 mm.

3. A disk-type circumferential multi-nozzle two-way counter-jet homogenization device according to claim 1, characterized in that, The disc-shaped base body (10) is a disc-shaped metal structure with a diameter of 200 to 800 mm and a wall thickness of 20 to 50 mm.

4. A disk-type circumferential multi-nozzle two-way counter-jet homogenization device according to claim 1, characterized in that, The pipeline of the annular fluid channel (11) adopts a streamline transition: the connection between the inlet and the branch flow channel uses an arc chamfer, and the chamfer radius is 0.2 times the cross-sectional diameter. And the surfaces of the disc-shaped base body (10) and the annular fluid channel (11) are provided with wear-resistant coatings and surface polishing treatments.

5. A disk-type circumferential multi-nozzle two-way counter-jet homogenization device according to claim 1, characterized in that, The distance between the outer wall of the cavity channel and the edge of the disc body is 10 to 20 mm, the cross-section is circular, the diameter is 20 to 30 mm, and the vertical height is 5 to 100 mm.

6. The disk-type circumferential multi-nozzle two-way counter-jet homogenization device according to claim 1, wherein The nozzle mounting cavity (12) is connected to the shrinking part of the micro-hole nozzle (21) to form a double-arc continuous shrinking section.

7. A disk-type circumferential multi-nozzle two-way counter-jet homogenization device according to claim 1, characterized in that, The described driving mechanism (30) is a variable-frequency motor or a magnetic levitation drive. The motor shaft is connected to the shaft hole of the disc-shaped substrate (10). The rotational speed regulation range is 500 - 5000 rpm and can be dynamically adjusted according to the material viscosity. The variable-frequency motor has a power of 2 - 10 kW.

8. A disc-type circumferential multi-nozzle two-way counter-flow homogenizing device according to claim 1, characterized in that, The described fluid delivery system (40) includes a high-pressure plunger pump (41) and a flow regulating valve (42). The working pressure of the high-pressure plunger pump (41) is 0.5 - 10 MPa, and the flow range is 10 - 1000 L / h.

9. The disk-type circumferential multi-nozzle two-way counter-jet homogenizing device according to claim 1, characterized in that, The described temperature control unit (50) is an integrated cooling flow channel inside the disc-shaped substrate (10). The temperature control accuracy is ±1°C, reducing the system temperature rise and increased heat loss caused by jet impact.

10. The usage method of a disc-type circumferential multi-nozzle two-way counter-jet homogenizing device according to any one of claims 1 to 9, characterized in that, The steps are as follows: First step: Check the equipment before starting up. Confirm that there is no residual material from the previous mixing in the homogenizer. Check the cooling liquid level and the installation and sealing conditions of the micro-nozzle (21). Second step: Pre-cool the system. Start the temperature control unit (50), turn on the cooling pump, adjust the system flow to 20 L / min, and the pressure to 0.2 MPa. Ensure that the temperature of the disc-shaped substrate (10) ≤ 35°C and the instrument readings are stable. Third step: Start the driving mechanism. Adjust the frequency converter to the lowest frequency of 10 Hz, start the driving mechanism (30). After confirming that the rotation direction is consistent with the arrow, gradually increase the frequency to 1500 rpm, with each increase ≤ 10%. Step 4: Start the fluid delivery system (40), open the feed valve, and set the initial feed flow rate to 5 m 3 / h; Observe the pressure gauge to ensure that the inlet pressure ≤ 0.5 MPa to avoid idling and dry grinding; Fifth step: Run and monitor. Confirm that the homogenizer is operating normally, regularly take samples to detect particle size, viscosity, etc., until the target particle size requirement is met. Sixth step: Shut down. Gradually reduce the rotational speed to 10 Hz, close the feed valve, keep the temperature of the homogenizer < 40°C, circulate and rinse with a cleaning agent for 10 minutes, then turn off the main motor and the cooling pump, and lock the power switch.

Images