Ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing regulation and control system and application thereof

Abstract

The invention belongs to the technical field of gas-liquid mixing and dispersing, and particularly relates to an ultrasonic-assisted efficient gas-liquid mixing regulation and control system for micro-nano bubbles and application of the ultrasonic-assisted efficient gas-liquid mixing regulation and control system. In order to realize accurate regulation and control of bubbles, a water phase and gas are subjected to cavitation and ultrasonic treatment in a bubble generation unit, the water phase and the gas are subjected to hydrodynamic cavitation in a Venturi tube and then subjected to ultrasonic treatment, the water phase and the gas are subjected to cavitation through the Venturi tube again after ultrasonic treatment, and then circulation and synchronous cavitation and ultrasonic treatment are performed. Bubble particles in the solution are detected in real time in the treatment process; the ultrasonic frequency ranges from 20 kHz to 200 kHz, the gas pressure ranges from 0.1 MPa to 0.5 MPa, the gas flow ranges from 0.1 L / min to 0.5 L / min, the total time of cavitation and ultrasonic treatment ranges from 3 min to 10 min, and the water phase temperature in the treatment process ranges from 15 DEG C to 50 DEG C; the particle size D90 of the micro-nano bubbles in the finally obtained system is less than or equal to 600nm, and the accurate regulation and control of the bubble size are realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas-liquid mixing and dispersion, and particularly relates to an ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing and regulation system and application thereof. BACKGROUND

[0002] In a gas-liquid mixing system, the bubbles generated by a traditional bubble generating device are uneven in size and poor in stability, resulting in low gas-liquid mass transfer efficiency and limiting the practical application thereof in industrial production. In addition, in a traditional gas-liquid mixing device (such as a bubble column, an aeration head, a Venturi tube, etc.), bubbles are mainly generated through mechanical shearing, gas jet or simple compression dissolution. Although these methods can realize basic gas-liquid contact, the generated bubbles are generally uneven in size and discrete in distribution, and are mostly millimeter-level or even centimeter-level large bubbles. Moreover, it is often difficult to stably and continuously generate micro-nano bubbles with good monodispersity and narrow size distribution range under working conditions. The initial size, concentration and stability of the bubbles are significantly affected by fluid properties, pressure, temperature and equipment parameters, and lack flexible and accurate online regulation means.

[0003] Micro-nano bubbles are slow in rising in water, can stay in water for several days to several weeks, greatly extend the gas-liquid contact time, have high specific surface area and mass transfer efficiency, accelerate the transfer of gas (such as oxygen and ozone) to the liquid phase, can generate hydroxyl radicals (·OH) when the bubbles shrink and break, have strong oxidizing property, and can adsorb positively charged pollutants (such as heavy metals and oil droplets) by using the surface charging characteristics. Based on the above unique advantages, micro-nano bubbles become the key to improving the gas-liquid mixing efficiency, but the existing technology is difficult to realize accurate regulation and real-time monitoring of the bubble size. SUMMARY

[0004] In view of the deficiencies of the prior art, the application aims to provide an ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing and regulation system and application thereof, which performs ultrasonic treatment on micro-nano bubbles during or after the generation of the micro-nano bubbles, optimizes the particle size distribution and stability of the micro-nano bubbles, realizes efficient and homogeneous gas-liquid mixing, solves the problem of insufficient adaptability of a traditional gas-liquid mixing system, and is connected with other subsequent devices for practical application and processing in multiple fields.

[0005] The ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing and regulation system of the application comprises an ultrasonic treatment micro-nano bubble generating unit for generating micro-nano bubbles and a real-time monitoring unit for monitoring the particle size distribution of the micro-nano bubbles.

[0006] Aqueous phase and gas are subjected to cavitation and ultrasonic treatment in micro-nano bubble generation unit. Specifically, aqueous phase and gas are first hydraulically cavitated in Venturi tube and then flow into ultrasonic cleaner for circulation and simultaneous cavitation and ultrasonic treatment. During the treatment process, real-time monitoring unit detects bubble particles in solution in real time, and finally obtains micro-nano bubble solution system that meets the requirements.

[0007] The ultrasonic frequency was 20kHz~200kHz, the gas pressure was 0.1MPa~0.5MPa, the gas flow rate was 0.1L / min~0.5L / min, the total time for cavitation and ultrasonic treatment was 3min~10min, and the water phase temperature during the treatment was 15℃~50℃; the final solution system had a micro-nano bubble particle size of D90≤600nm.

[0008] The specific processing procedure includes the following: the aqueous phase is first injected into an ultrasonic cleaner, and then flows into a Venturi tube from the ultrasonic cleaner. After the gas and aqueous phase undergo hydraulic cavitation in the Venturi tube, an initial micro-nano bubble aqueous solution is formed. The initial micro-nano bubble aqueous solution is then pumped into the ultrasonic cleaner for ultrasonic treatment via a peristaltic pump. The ultrasonically treated micro-nano bubble aqueous solution is then fed back into the Venturi tube for hydraulic cavitation again. This process is repeated, with cavitation and ultrasonic treatment occurring simultaneously. At the same time, a nanoparticle tracking analyzer is used to track the micro-nano bubble aqueous solution during the processing, monitoring the particle size and distribution of the micro-nano bubbles in the aqueous solution in real time. Micro-nano bubble aqueous solutions that meet the particle size requirements are then introduced into subsequent application units.

[0009] The gases include air and nitrogen. The aqueous phase includes artificial seawater, active solution, fermentation solution, or fruit juice; the active solution contains 0.3% to 1.0% active ingredients by mass, including methyl isobutyl methanol, sodium oleate, dodecylamine, and polyacrylamide; the fermentation solution contains 1.0% glucose, 0.8% soybean peptone, 0.5% yeast extract, and 0.3% potassium dihydrogen phosphate by mass concentration.

[0010] When the ultrasonic frequency is 20kHz~200kHz, the gas pressure is 0.1MPa~0.5MPa, the gas flow rate is 0.1L / min~0.5L / min, the total time for cavitation and ultrasonic treatment is 3min~10min, and the aqueous phase temperature is 15℃~50℃, the final solution system has a micro-nano bubble particle size ≤541nm.

[0011] When the ultrasonic frequency is 20kHz~150kHz, the gas pressure is 0.1MPa~0.4MPa, the gas flow rate is 0.1L / min~0.4L / min, the total time for cavitation and ultrasonic treatment is 3min~8min, and the aqueous phase temperature is 15℃~35℃, the final solution system has a micro-nano bubble particle size ≤498nm.

[0012] When the ultrasonic frequency is 50kHz~150kHz, the gas pressure is 0.1MPa~0.3MPa, the gas flow rate is 0.1L / min~0.3L / min, the total time for cavitation and ultrasonic treatment is 3min~5min, and the aqueous phase temperature is 15℃~30℃, the final solution system has a micro-nano bubble particle size ≤425nm.

[0013] When the ultrasonic frequency is 50kHz~100kHz, the gas pressure is 0.1MPa~0.2MPa, the gas flow rate is 0.1L / min~0.2L / min, the total time for cavitation and ultrasonic treatment is 3min~5min, and the aqueous phase temperature is 15℃~25℃, the final solution system has a micro-nano bubble particle size ≤386nm.

[0014] The final micro / nano bubble solution system had a bubble particle concentration of 4.21 × 10⁻⁶ particles per 1 ml of solution. 6 ~5.17×10 6 The system was allowed to stand at room temperature for 10 minutes, and the concentration of air bubbles per 1 ml of solution was 2.35 × 10⁻⁶. 6 ~3.05×10 6 The bubble number half-life is 139s~147s; after standing for 30 minutes, the bubble particle concentration per 1ml of solution is 1.32×10⁻⁶. 6 ~2.27×10 6 The number half-life of the bubbles is 108s~117s.

[0015] The ultrasonic micro-nano bubble generating unit includes a pressure regulating valve, a gas cylinder, a venturi tube, a peristaltic pump, an ultrasonic cleaner, a conversion connector, and a valve. The pressure regulating valve is located on the gas cylinder and is connected to the throat of the venturi tube via a hose. One end of the venturi tube is connected to the peristaltic pump via a hose, and the other end is connected to the drain port on one side of the ultrasonic cleaner. The hose with the conversion connector is connected to the ultrasonic cleaner via the pump head of the peristaltic pump.

[0016] The real-time monitoring unit includes a nanoparticle tracking analyzer and a computer. The nanoparticle tracking analyzer is connected to the computer to provide feedback on control parameters.

[0017] The ultrasonic cleaner is connected to a nanoparticle tracking analyzer via a hose with a valve.

[0018] The ultrasonic-assisted micro-nano bubble gas-liquid high-efficiency mixing and control system of the present invention can be connected to subsequent practical application units such as mineral flotation equipment, wastewater treatment equipment or bio-fermentation equipment, and can be used in the fields of mineral flotation, wastewater treatment, fruit juice preservation or bio-fermentation.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. By combining ultrasonic cavitation with the cavitation (contraction and rupture) effect of micro-nano bubbles, the solution and gas can be fully contacted and efficiently dispersed, thereby improving the bubble dispersion efficiency, significantly increasing the specific surface area and surface activity of the bubbles, and achieving a "1+1>2" enhanced oxidation effect.

[0021] 2. The device of the present invention can realize the "intelligent" and "customized" bubble function. By monitoring the movement trajectory and size distribution of micro-nano bubble water in real time through the closed-loop linkage of monitoring data and control unit, the bubble particle size distribution and particle concentration flowing into the subsequent application system can be accurately controlled, and the matching bubble size accuracy can be customized, which greatly improves the processing efficiency in different scenarios and broadens the application scope of the system.

[0022] 3. The micro-nano bubble water produced using this device exhibits high surface activity. By combining ultrasonic cavitation (high-frequency vibration) with parameter control, the problems of easy bubble aggregation and uneven distribution in traditional technologies are solved, resulting in a uniformly dispersed product. The device operates without secondary pollution, consumes little energy, and requires few reagents. Parameter control enables highly efficient preparation, reducing costs and consumption while minimizing pollution risks, thus meeting the requirements of green environmental protection.

[0023] 4. It solves the engineering problem of scaling and clogging in traditional gas-liquid mixing devices. The vibration generated by ultrasound in the device can effectively prevent impurities (such as particulate matter, microbial films and inorganic salts) from depositing on the surface of the cavitation storage tank, keeping the flow channel unobstructed, reducing maintenance costs, and making it easy to promote and apply in industrial applications. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the ultrasonic micro-nano bubble control device of the present invention.

[0025] Figure 2 This is a top view of the ultrasonic cleaner used in the control device of the present invention;

[0026] Among them: 1-pressure regulating valve, 2-gas cylinder, 3-Venturi tube, 4-peristaltic pump, 5-ultrasonic cleaner, 6-adapter, 7-valve A, 8-nanoparticle tracking analyzer, 9-computer, 10-valve B;

[0027] Figure 3 Figures showing the size and concentration distribution of micro / nano bubbles prepared in each embodiment;

[0028] Figure 4 The image shows the size distribution of micro-nano bubbles in the aqueous solution prepared in Example 1 after it has been left to stand. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. It should be noted that the embodiments described in this invention are only for further explanation and illustration, and not for limiting their application scope. Based on this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention.

[0030] A schematic diagram of the ultrasonic-assisted micro / nano bubble control device in the embodiment is shown below. Figure 1 As shown, the ultrasonic cleaner includes an ultrasonic micro-nano bubble generation unit and a real-time monitoring unit. A top view of the ultrasonic cleaner is shown below. Figure 2 As shown.

[0031] The ultrasonic micro-nano bubble generating unit includes a pressure regulating valve 1, a gas cylinder 2, a venturi tube 3, a peristaltic pump 4, an ultrasonic cleaner 5, a conversion connector 6, and a valve A7. The pressure regulating valve 1 is installed on the gas cylinder 2 and is connected to the throat of the venturi tube 3 via a hose. One end of the venturi tube 3 is connected to the peristaltic pump 4 via a hose, and the other end is connected to the drain port on one side of the ultrasonic cleaner 5. The other end of the peristaltic pump 4 is connected to the ultrasonic cleaner 5 via a hose with a conversion connector 6.

[0032] The real-time monitoring unit includes a nanoparticle tracking analyzer 8, a computer 9, and a valve B 10. The nanoparticle tracking analyzer 8 is connected to the computer 9 for feedback control parameters, and the nanoparticle tracking analyzer 8 is connected to the valve B10 via a hose.

[0033] The ultrasonic cleaner 5 is connected to the nanoparticle tracking analyzer 8 via a hose with valve A7.

[0034] Aqueous phase is injected into the ultrasonic cleaner and flows through a hose into the Venturi tube 3. Simultaneously, the pressure in the gas cylinder 2 is adjusted to 0.1 MPa~0.5 MPa using the pressure regulating valve 1, and the gas flow rate in the gas cylinder 2 is adjusted to 0.1 L / min~0.5 L / min. In the Venturi tube 3, hydraulic cavitation forms an initial micro / nano bubble solution. This initial micro / nano bubble solution is then pumped into the ultrasonic cleaner via a peristaltic pump 4 for ultrasonic treatment. The ultrasonically treated micro / nano bubble solution is then passed back into the Venturi tube for hydraulic cavitation again, and the process is repeated, with cavitation and ultrasonic treatment occurring simultaneously. Throughout the cavitation and ultrasonic treatment process, the ultrasonic frequency is 20 kHz~200 kHz, the aqueous phase solution temperature is 15℃~50℃, and the treatment time is 3 min~10 min. The ultrasonically treated micro / nano bubble aqueous solution is then sent to a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution, and the prepared micro / nano bubble aqueous solution with a specific particle size range is introduced into subsequent application units. The concentration of nanobubble particles in the solution was detected using a NanoSight Pro nanoparticle tracking analyzer, and the bubble half-life was detected using a DFA100 fully automated foam analyzer.

[0035] Example 1

[0036] A 1% (w / w) methyl isobutyl methanol solution was prepared as the aqueous phase. The pressure of air cylinder 2 was adjusted to 0.1 MPa using pressure regulating valve 1, and the air flow rate of air cylinder 2 was adjusted to 0.1 L / min. After hydraulic cavitation in venturi tube 3, the solution was pumped into an ultrasonic cleaner via peristaltic pump 4 for ultrasonic treatment. The process was then circulated and cavitation and ultrasonic treatment were performed simultaneously. The total time for cavitation and ultrasonic treatment was 5 min, the ultrasonic operating frequency was 50 kHz, and the temperature of the aqueous phase solution was 25℃ throughout the process. The resulting micro / nano bubble aqueous solution was fed into a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution, yielding a micro / nano bubble aqueous solution with a particle size of 67 nm to 386 nm. The micro / nano bubble aqueous solution after standing at room temperature is shown below. Figure 4 As shown.

[0037] The prepared micro / nano bubble aqueous solution was introduced into a flotation machine as the flotation water. 2.0 g of spodumene powder was added to the flotation machine. During flotation, the pH of the pulp was maintained at 7 using HCl and NaOH solutions. An activator, CaCl2 solution, and a collector were added sequentially. The collector consisted of sodium oleate and dodecylamine in a mass ratio of 8:1. The activator concentration was 20 mg / L, and the collector concentration was 50 mg / L. Each addition of reagents was followed by a 3-minute reaction before the next addition, yielding spodumene concentrate. The recovery rate of spodumene using micro / nano bubble water flotation was calculated to be 75.96%. Under the same flotation conditions, the recovery rate of spodumene using ordinary water was 52.67%.

[0038] Example 2

[0039] A 1% (w / w) polyacrylamide solution was prepared as the aqueous phase. The pressure of air cylinder 2 was adjusted to 0.4 MPa using pressure regulating valve 1, and the air flow rate of air cylinder 2 was adjusted to 0.3 L / min. After hydraulic cavitation in venturi tube 3, the solution was pumped into an ultrasonic cleaner via peristaltic pump 4 for ultrasonic treatment. The process was then circulated and cavitation and ultrasonic treatment were performed simultaneously. The total time for cavitation and ultrasonic treatment was 8 minutes, the ultrasonic operating frequency was 20 kHz, and the temperature of the aqueous phase solution was 30℃ throughout the process. The resulting micro / nano bubble aqueous solution was sent to a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution, yielding a micro / nano bubble aqueous solution with a particle size of 98 nm to 425 nm.

[0040] The prepared micro-nano bubble aqueous solution was continuously injected into the wastewater treatment equipment through an aeration system for wastewater purification. After oxidation treatment with the micro-nano bubble aqueous solution, the DO concentration of the polluted water sample reached 8.67 mg / L, the COD concentration was 21.68 mg / L, and the removal rate reached 55%.

[0041] Example 3

[0042] Artificial seawater was used as the aqueous phase. Pressure regulating valve 1 adjusted the pressure of air cylinder 2 to 0.3 MPa and the air flow rate of air cylinder 2 to 0.4 L / min. After hydraulic cavitation in venturi tube 3, the air was pumped through peristaltic pump 4 into an ultrasonic cleaner for ultrasonic treatment. The process was then circulated and cavitation and ultrasonic treatment were performed simultaneously. The total time for cavitation and ultrasonic treatment was 5 minutes, the ultrasonic operating frequency was 50 kHz, and the aqueous solution temperature was 25℃ throughout the process. The resulting micro / nano bubble aqueous solution was sent to a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution, yielding a micro / nano bubble aqueous solution with a particle size of 135 nm to 482 nm.

[0043] The prepared micro-nano bubble aqueous solution was continuously injected into a high-density recirculating aquaculture system via a suspended aeration chain as aquaculture water. The aquaculture water was pre-aerated for two days using the method of this invention before the seedlings were introduced. During the aquaculture period, continuous intelligent aeration was maintained 24 hours a day. The dissolved oxygen (DO) concentration in the aquaculture pond remained stable within the range of 8.60 mg / L to 9.62 mg / L. The incidence of aquatic organism diseases decreased by 34.81%, the stocking density increased by 1.84 times compared to traditional aquaculture, and the aquaculture cycle was shortened by 15.88%.

[0044] Example 4

[0045] The fermentation solution served as the aqueous phase. Bacillus subtilis was used as the fermentation strain. The fermentation solution (culture medium) mainly consisted of the following components by mass percentage: 1.0% glucose, 0.8% soybean peptone, 0.5% yeast extract, and 0.3% potassium dihydrogen phosphate. Pressure was adjusted to 0.3 MPa using pressure regulating valve 1 and the air flow rate of air cylinder 2 was adjusted to 0.5 L / min. After hydraulic cavitation in venturi tube 3, the gas was pumped through peristaltic pump 4 into an ultrasonic cleaner for ultrasonic treatment. The process was then circulated and cavitation and ultrasonic treatment were performed simultaneously. The total time for cavitation and ultrasonic treatment was 8 minutes, with an ultrasonic operating frequency of 200 kHz. The temperature of the aqueous phase solution was 35℃ throughout the process. The resulting micro / nano bubble aqueous solution was fed into a nanoparticle tracking analyzer 8 for bubble particle tracking. The particle size and distribution of micro / nano bubbles in the aqueous solution were monitored in real time, yielding an aqueous solution with a bubble size of 116 nm to 541 nm.

[0046] The prepared micro / nano bubble aqueous solution was continuously injected into the bio-fermentation system via an airlift circulating reactor as fermentation water. After 3 days, the dissolved dissolved oxygen (DO) in the fermentation broth of the aquaculture tank stabilized at 6.5 mg / L~7.2 mg / L; the viable bacterial count reached 3.2 × 10⁻⁶. 9 The CFU / mL was increased by 42.3% compared to the traditional direct aeration technology, and the protein yield was increased to 35.6 g / L.

[0047] Example 5

[0048] Apple juice was used as the aqueous phase. Pressure was adjusted to 0.2 MPa in nitrogen cylinder 2 using pressure regulating valve 1, and the gas flow rate was adjusted to 0.3 L / min. After hydraulic cavitation in venturi tube 3, the gas was pumped into an ultrasonic cleaner via peristaltic pump 4 for ultrasonic treatment. The process was then repeated, with cavitation and ultrasonic treatment occurring simultaneously. The total time for cavitation and ultrasonic treatment was 3 minutes, with an ultrasonic operating frequency of 150 kHz. The aqueous phase solution temperature was maintained at 15℃ throughout the process. The juice containing micro / nano bubbles was then fed into a nanoparticle tracking analyzer 8 for particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution. A micro / nano bubble juice system with bubble sizes ranging from 53 nm to 396 nm was obtained. The micro / nano bubble size and concentration distribution are shown below. Figure 3 As shown, a concentration peak appears at 112.5 nm, where the bubble particle concentration is 1.05 × 10⁻⁶. 6 .

[0049] Nitrogen micro-nano bubbles are used to replace dissolved oxygen in fruit juice. The dissolution efficiency of nitrogen in fruit juice is 2.68 times higher than that of traditional bubbling, the dissolved oxygen (DO) level drops rapidly to below 0.3 mg / L, the browning rate of the fruit juice is reduced by 43.73%, and the flavor loss is reduced by about 30% compared with traditional vacuum degassing processes.

[0050] Example 6

[0051] A 1% sodium oleate solution was prepared as the aqueous phase and injected into the ultrasonic cleaner. The solution flowed through a hose into a venturi tube 3. Simultaneously, the pressure in air cylinder 2 was adjusted to 0.1 MPa using a pressure regulating valve 1, and the air flow rate in air cylinder 2 was adjusted to 0.1 L / min. In the venturi tube 3, hydraulic cavitation formed an initial micro / nano bubble aqueous solution. This initial micro / nano bubble aqueous solution was then pumped into the ultrasonic cleaner via a peristaltic pump 4 for ultrasonic treatment. The process was then circulated, with cavitation and ultrasonic treatment occurring simultaneously. The total time for cavitation and ultrasonic treatment was 5 minutes, the ultrasonic operating frequency was 100 kHz, and the temperature of the aqueous phase solution was 25℃ throughout the process. The micro / nano bubble aqueous solution was then fed into a nanoparticle tracking analyzer 8 for particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution, yielding a micro / nano bubble aqueous solution with a particle size ranging from 76 nm to 353 nm. After standing at room temperature for 30 minutes, the bubble number half-life was 155.34 s, while the bubble number half-life of conventional NaOL solution was 122.51 s. The micro-nano bubble system prepared by the method of this invention has more stable bubbles.

[0052] Example 7

[0053] A 1% (w / w) methyl isobutyl methanol solution was prepared as the aqueous phase and injected into the ultrasonic cleaner. The solution flowed through a hose into a venturi tube 3. Simultaneously, the pressure in air cylinder 2 was adjusted to 0.3 MPa using a pressure regulating valve 1, and the air flow rate in air cylinder 2 was adjusted to 0.3 L / min. In the venturi tube 3, hydraulic cavitation formed an initial micro / nano bubble aqueous solution. This initial micro / nano bubble aqueous solution was then pumped into the ultrasonic cleaner via a peristaltic pump 4 for ultrasonic treatment. The process was then circulated, with cavitation and ultrasonic treatment occurring simultaneously. The total time for cavitation and ultrasonic treatment was 3 minutes, the ultrasonic operating frequency was 150 kHz, and the temperature of the aqueous phase solution was 15℃ throughout the process. The micro / nano bubble aqueous solution was then fed into a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution. A micro / nano bubble aqueous solution with a particle size of 53 nm to 425 nm was obtained. The micro / nano bubble size and concentration distribution are shown below. Figure 3 As shown, the bubble particle concentration at 116.5 nm is 0.85 × 10⁻⁶. 6 The concentration of bubble particles at 149.5 nm is 1.13 × 10⁻⁶. 6 .

[0054] Example 8

[0055] A 1% (w / w) methyl isobutyl methanol solution was prepared as the aqueous phase and injected into an ultrasonic cleaner. The solution flowed through a hose into a venturi tube 3. Simultaneously, the pressure in an air cylinder 2 was adjusted to 0.4 MPa using a pressure regulating valve 1, and the air flow rate in the air cylinder 2 was adjusted to 0.4 L / min. In the venturi tube 3, hydraulic cavitation formed an initial micro / nano bubble aqueous solution. This initial micro / nano bubble aqueous solution was then pumped into the ultrasonic cleaner via a peristaltic pump 4 for ultrasonic treatment. The process was then circulated, with cavitation and ultrasonic treatment occurring simultaneously. The total time for cavitation and ultrasonic treatment was 3 minutes, the ultrasonic operating frequency was 150 kHz, and the temperature of the aqueous phase solution was 15℃ throughout the process. The micro / nano bubble aqueous solution was then fed into a nanoparticle tracking analyzer 8 for bubble particle tracking, real-time monitoring of the micro / nano bubble particle size and distribution in the aqueous solution. A micro / nano bubble aqueous solution with a particle size of 90 nm to 498 nm was obtained. The micro / nano bubble size and concentration distribution are shown below. Figure 3 As shown, the bubble particle concentration at 89.7 nm is 0.89 × 10⁻⁶. 6 The bubble particle concentration at 130.5 nm is 0.80 × 10⁻⁶. 6 .

[0056] Example 9

[0057] The total time for cavitation and ultrasonic treatment was 10 minutes. The temperature of the aqueous solution was 50°C throughout the entire cavitation and ultrasonic treatment process. Other preparation methods were the same as in Example 8. The final micro / nano bubble aqueous solution had a bubble size of 83 nm to 536 nm. The micro / nano bubble size and concentration distribution are shown below. Figure 3 As shown, the bubble particle concentration at 97.5 nm is 0.76 × 10⁻⁶. 6 The bubble particle concentration at 161.5 nm is 0.78 × 10⁻⁶. 6 .

[0058] The scope of protection of this invention is not limited to the embodiments described above. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its scope and spirit. If these modifications and variations fall within the scope of this invention and its equivalents, then the intent of this invention also includes these modifications and variations.

Claims

1. An ultrasonic-assisted micro-nano bubble gas-liquid high-efficiency mixing and regulation system, characterized in that, The control system comprises an ultrasonic treatment micro-nano bubble generating unit for generating micro-nano bubbles and a real-time monitoring unit for monitoring the particle size distribution of the micro-nano bubbles; The water phase and the gas are subjected to cavitation and ultrasonic treatment in the micro-nano bubble generating unit: the water phase and the gas are subjected to cavitation in a Venturi tube and then subjected to ultrasonic treatment, and after the ultrasonic treatment, the water phase and the gas are subjected to cavitation in the Venturi tube again, and then the cavitation and the ultrasonic treatment are cyclically and synchronously performed, and in the process, the real-time monitoring unit detects the bubble particles in the solution; and a micro-nano bubble solution system meeting the requirements is obtained. The ultrasonic frequency is 20 kHz to 200 kHz, the gas pressure is 0.1 MPa to 0.5 MPa, the gas flow rate is 0.1 L / min to 0.5 L / min, the total cavitation and ultrasonic treatment time is 3 min to 10 min, and the water phase temperature in the process is 15℃ to 50℃; and the micro-nano bubble particle size in the finally obtained solution system is D90≤600 nm.

2. The system of claim 1, wherein, The gas comprises air and nitrogen; and the water phase comprises artificial seawater, an active solution, a fermentation solution or fruit juice.

3. The system of claim 2, wherein, The mass fraction of the active ingredient in the active solution is 0.3% to 1.0%, and the active ingredient comprises methyl isobutyl carbinol, sodium oleate, dodecylamine and polyacrylamide; and the fermentation solution comprises 1.0% glucose, 0.8% soybean peptone, 0.5% yeast extract powder and 0.3% potassium dihydrogen phosphate.

4. The system of claim 1, wherein, When the ultrasonic frequency is 20 kHz to 200 kHz, the gas pressure is 0.1 MPa to 0.5 MPa, the gas flow rate is 0.1 L / min to 0.5 L / min, the total cavitation and ultrasonic treatment time is 3 min to 10 min, and the water phase temperature is 15℃ to 50℃, the micro-nano bubble particle size in the finally obtained solution system is ≤541 nm.

5. The system of claim 1, wherein, When the ultrasonic frequency is 20 kHz to 150 kHz, the gas pressure is 0.1 MPa to 0.4 MPa, the gas flow rate is 0.1 L / min to 0.4 L / min, the total cavitation and ultrasonic treatment time is 3 min to 8 min, and the water phase temperature is 15℃ to 35℃, the micro-nano bubble particle size in the finally obtained solution system is ≤498 nm.

6. The system of claim 1, wherein, When the ultrasonic frequency is 50 kHz to 150 kHz, the gas pressure is 0.1 MPa to 0.3 MPa, the gas flow rate is 0.1 L / min to 0.3 L / min, the total cavitation and ultrasonic treatment time is 3 min to 5 min, and the water phase temperature is 15℃ to 30℃, the micro-nano bubble particle size in the finally obtained solution system is ≤425 nm.

7. The system of claim 1, wherein, When the ultrasonic frequency is 50 kHz to 100 kHz, the gas pressure is 0.1 MPa to 0.2 MPa, the gas flow rate is 0.1 L / min to 0.2 L / min, the total cavitation and ultrasonic treatment time is 3 min to 5 min, and the water phase temperature is 15℃ to 25℃, the micro-nano bubble particle size in the finally obtained solution system is ≤386 nm.

8. The system of claim 1, wherein, The bubble generating unit comprises a pressure regulating valve, a gas cylinder, a Venturi tube, a peristaltic pump, an ultrasonic cleaning machine, a conversion joint and a valve; the pressure regulating valve is arranged on the gas cylinder and connected with a throat of the Venturi tube through a hose; one end of the Venturi tube is connected with the peristaltic pump through a hose, and the other end is connected with a liquid outlet on one side of the ultrasonic cleaning machine; the other end of the peristaltic pump is connected with the ultrasonic cleaning machine through a hose with the conversion joint; The real-time monitoring unit comprises a nanoparticle tracking analyzer and a computer connected with the nanoparticle tracking analyzer; The ultrasonic cleaning machine is connected with the nanoparticle tracking analyzer through a hose with the valve.

9. The use of the system for ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing and regulation according to claim 1, characterized in that, The regulation system is used in the fields of mineral flotation, wastewater treatment, fruit juice preservation or biological fermentation.

10. The use of an ultrasonic-assisted micro-nano bubble gas-liquid efficient mixing and control system according to claim 9, characterized in that, The regulation system is connected with an actual application unit, and the actual application unit comprises a mineral flotation device, a wastewater treatment device or a biological fermentation device.

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