Micro-nano bubble generating device and method

Abstract

The invention relates to a micro-nano bubble generating device and method. The device comprises a liquid storage tank (2) used for storing gas dissolving liquid (1) and a low-temperature platform (3) used for freezing the gas dissolving liquid (1). The low-temperature platform (3) enables the gas-dissolved liquid (1) in the liquid storage tank (2) to be frozen and solidified, a solid-liquid phase interface is pushed, and micro-nano bubbles are generated. Compared with the prior art, the micro-nano bubble generation device and method based on solidification segregation have the advantages that bubble generation is stable and efficient, the machining technology is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-nano bubble preparation, and in particular to a micro-nano bubble generating device and method. Background Art

[0002] In some industrial applications, micro-nano bubbles have shown great application potential in many fields. For example, in the field of ultrasonic imaging, the high compressibility of micro-nano bubbles makes them have a better scattering effect on ultrasonic waves and show nonlinear effects, which can make their scattering signals clearly distinguished from the corresponding signals generated by the body's tissues, providing a very good tissue perfusion imaging method; in the medical field, oxygen micro-nano bubbles can be used to supply oxygen to the body while delivering drugs directly to the lesion site, thereby achieving direct treatment of the lesion site, reducing the number of surgeries, and allowing the body to recover quickly; in the petrochemical field, micro-nano bubbles have the characteristics of large specific surface area, long residence time, and large pressure difference between the inside and outside of the bubble, which can significantly improve the gas-liquid mass transfer rate and are expected to be used in the liquid phase hydrogenation process of oil products to improve the quality of oil products.

[0003] Conventional methods for preparing micro-nano bubbles include mechanical cutting, electromagnetic wave irradiation, chemical electrolysis and substrate heating. However, they have the following obvious disadvantages: the preparation system is complex and costly, the original solution is contaminated after adding reagents through chemical reactions, the bubbles cannot be recycled and are unstable after temperature changes. There is currently no effective technology to solve these problems. Summary of the invention

[0004] The purpose of the present invention is to provide a micro-nano bubble generating device and method, which has a simple preparation system and low cost.

[0005] The object of the present invention can be achieved by the following technical scheme: A micro-nano bubble generating device comprises a liquid storage tank for storing dissolved gas liquid and a low temperature platform for freezing the dissolved gas liquid;

[0006] The low temperature platform causes the dissolved gas liquid in the liquid storage tank to freeze and solidify, and the solid-liquid interface moves and generates micro-nano bubbles.

[0007] Preferably, the solubility of the gas in the gas-dissolving liquid in the liquid is 0.1-20.

[0008] Further preferably, the gas in the gas-dissolved liquid includes one or more of oxygen, carbon dioxide and nitrogen.

[0009] Further preferably, the liquid in the gas-dissolving liquid includes pure water, ethanol aqueous solution or sodium chloride aqueous solution.

[0010] More preferably, in the ethanol aqueous solution, the concentration of ethanol is 25-35 wt %.

[0011] More preferably, in the sodium chloride aqueous solution, the concentration of sodium chloride is 0.8-1.2 wt %.

[0012] Preferably, the gas-dissolving liquid is pure water with a solubility of 0.1 to 20 in which oxygen, carbon dioxide and nitrogen are dissolved, a 30% ethanol solution or a 1% sodium chloride solution.

[0013] Further preferably, the pure water contains 8 mg / L of oxygen, 30 mg / L of carbon dioxide and 20 mg / L of nitrogen.

[0014] Further preferably, the ethanol solution contains 8 mg / L of oxygen, 6 mg / L of carbon dioxide and 3 mg / L of nitrogen.

[0015] Further preferably, the sodium chloride solution contains 7 mg / L of oxygen, 15 mg / L of carbon dioxide and 12 mg / L of nitrogen.

[0016] Preferably, the operating temperature of the low temperature platform is below -10°C.

[0017] Preferably, the solid-liquid interface movement speed is less than 10 μm / s.

[0018] Preferably, the diameter of the micro-nano bubbles is 10 to 60 μm.

[0019] Preferably, the low-temperature platform is arranged at the bottom of the liquid storage tank, the solid-liquid interface moves from the bottom to the top, and micro-nano bubbles are generated above the solid-liquid interface.

[0020] Further preferably, the top of the liquid storage tank is connected with a micro-nano bubble collection component, and the micro-nano bubble collection component includes a collection medium;

[0021] The collecting medium is a liquid medium whose density is lower than that of the gas-dissolving liquid and is immiscible with the gas-dissolving liquid. The top of the gas-dissolving liquid contacts the collecting medium, and a liquid-liquid interface exists at the contact point.

[0022] More preferably, the collection medium is a water-insoluble liquid medium such as benzene, perfluorohexanone or silicone oil.

[0023] Preferably, the silicone oil has a viscosity of 1 to 200 cs.

[0024] More preferably, the temperature of the collecting medium does not exceed 25°C.

[0025] More preferably, the micro-nano bubble collection component further comprises a transport pipeline, a micro-nano bubble collector, a delivery pump, a collection medium inlet and a collection medium outlet;

[0026] The top of the liquid storage tank is connected to the transport pipeline, the transport pipeline is connected to the micro-nano bubble collector and the delivery pump, the micro-nano bubble collector is provided with a collection medium outlet, the delivery pump is connected to the collection medium inlet, the collection medium enters the transport pipeline through the collection medium inlet and the delivery pump, and contacts the top of the dissolved gas liquid to form a liquid-liquid phase interface.

[0027] Preferably, the top of the liquid storage tank is connected to the transport pipeline through a closing structure that is small at the top and large at the bottom.

[0028] Further preferably, the cross-sectional shape of the closing structure is an isosceles trapezoid.

[0029] More preferably, the bottom angle of the isosceles trapezoid is 25-35°.

[0030] Further preferably, the collection medium fills the closing structure from the top of the dissolved gas liquid in the liquid storage tank to the lower bottom surface of the closing structure.

[0031] Preferably, the bottom material of the liquid storage tank is a metal material with good chemical stability, not easy to corrode or oxidize, and high thermal conductivity.

[0032] Further preferably, the bottom of the liquid storage tank is made of copper.

[0033] Preferably, the micro-nano bubble collector is a hollow sphere, the side of which is connected to the transport pipeline, and the top is connected to the collection medium outlet. The collection medium output from the collection medium outlet of the present invention is pollution-free and can be recycled.

[0034] Preferably, the delivery pump is a stainless steel chemical centrifugal pump.

[0035] A micro-nano bubble generation method is carried out using the above-mentioned micro-nano bubble generation device, comprising the following steps: using a low-temperature platform to create supercooling conditions, freezing and solidifying the dissolved gas liquid in a liquid storage tank, shifting the solid-liquid interface, and generating micro-nano bubbles at the solid-liquid interface.

[0036] Further preferably, the micro-nano bubble generation method specifically includes the following steps: a low-temperature platform located at the bottom of the liquid storage tank creates a supercooling condition, the dissolved gas liquid in the liquid storage tank freezes and solidifies, the solid-liquid interface moves from the bottom to the top, and micro-nano bubbles are generated above the solid-liquid interface, the generated micro-nano bubbles pass through the liquid-liquid interface and float into the collection medium, and the shear flow generated by the delivery pump pushes the micro-nano bubbles into the bubble collector.

[0037] More preferably, when the solid-liquid interface moves from the bottom to the top, the flow rate of the conveying medium is 0 mm / s.

[0038] More preferably, when the shear flow generated by the delivery pump pushes the micro-nano bubbles into the bubble collector, the flow rate of the collecting medium is 2-3 mm / s.

[0039] The present invention utilizes that during the solidification process, due to the regular arrangement of solid phase molecules, the substance to be extracted dissolved in the original liquid phase will be segregated, enriched and nucleated at the front of the solidification phase interface to form bubbles or micro-droplets. For example, during the freezing process of water, as the solidification surface gradually rises, bubbles gradually form above the ice-water interface.

[0040] Conventional bubble generating devices are complex, difficult to clean, easy to introduce impurities and have high costs. Different from the chemical method for preparing micro-nano bubbles, the present invention generates micro-nano bubbles by freezing water, which is a pure physical process based on solidification phase change. The prepared micro-nano bubbles are pure and pollution-free. In addition, the dissolved pure water can be repeatedly frozen and thawed, so that the micro-nano bubbles are fully collected and the utilization rate is high.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention provides a micro-nano bubble generating device and method based on solidification segregation, which not only generates bubbles stably and efficiently, but also has simple processing technology and low cost.

[0043] 2. The working principle of the micro-nano bubble generating device of the present invention is to generate micro-nano bubbles by freezing water, which is a pure physical process based on solidification phase change and will not introduce impurities. The produced micro-nano bubbles are pure and pollution-free.

[0044] 3. The micro-nano bubble generating device of the present invention can complete the preparation of micro-nano bubbles only by freezing and solidifying dissolved pure water. The preparation system is simple, the cost is low and the efficiency is high. While generating bubbles, a pure liquid phase without dissolved impurities can be prepared.

[0045] 4. The dissolved gas pure water used in the micro-nano bubble generating device of the present invention can undergo repeated freezing and thawing processes. The solubility of gas molecules in the crystal phase is much smaller than that in the liquid phase, thereby fully collecting more than 99% of the gas in the liquid phase, and the utilization rate of the gas-producing working fluid is high.

[0046] 5. The present invention is based on the physical process of solidification phase change, and physically transports micro-nano bubbles through a liquid medium, while obtaining a pure liquid phase without dissolved impurities. It can overcome the problems of existing micro-nano bubble preparation methods, such as unstable bubbles obtained after temperature changes, complex preparation methods, and high costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the micro-nano bubble generating device of the present invention;

[0048] Figure 2 A schematic diagram of bubbles generated above the ice-water interface of the present invention;

[0049] Figure 3A schematic diagram of the micro-nano bubbles of the present invention floating up into the oil;

[0050] Figure 4 It is a schematic diagram of collecting bubbles under the driving action of the shear flow of the pump in the present invention;

[0051] Figure 5 This is a measured experimental diagram of the micro-nano bubbles of the present invention floating up into the oil;

[0052] Figure 6 It is a histogram of the particle size of micro-nano bubbles collected in the actual measurement experiment of the present invention;

[0053] In the figure: 1-dissolved gas liquid, 11-solid-liquid interface, 12-micro-nano bubbles, 13-solidification surface, 2-liquid storage tank, 21-liquid inlet of the liquid storage tank, 22-liquid outlet of the liquid storage tank, 3-low temperature platform, 31-refrigeration medium inlet, 32-refrigeration medium outlet, 4-micro-nano bubble collection component, 41-collection medium, 42-liquid-liquid interface, 43-transport pipeline, 44-micro-nano bubble collector, 45-transport pump, 46-collection medium inlet, 47-collection medium outlet. DETAILED DESCRIPTION

[0054] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0055] Example 1

[0056] A micro-nano bubble generating device based on solidification segregation, such as Figure 1 As shown, the liquid storage tank 2 includes a low temperature platform 3 arranged at the bottom of the liquid storage tank 2. The liquid storage tank 2 stores the dissolved gas liquid 1. The low temperature platform 3 can freeze the dissolved gas liquid 1. During the freezing and solidification process of the dissolved gas liquid 1, Figure 2 As shown, the solidification surface 13 gradually rises, the solid-liquid interface 11 moves upward, and micro-nano bubbles 12 can be generated.

[0057] Example 2

[0058] A micro-nano bubble generating device based on solidification segregation, a micro-nano bubble collecting component 4 is provided on the top of a liquid storage tank 2, and the micro-nano bubble collecting component 4 specifically includes a collecting medium 41, a liquid-liquid interface 42, a transport pipeline 43, a micro-nano bubble collector 44, a transport pump 45, a collecting medium inlet 46 and a collecting medium outlet 47.

[0059] Specifically, the top of the liquid storage tank 2 is connected to the bottom opening of the delivery pipeline 43. The input end of the delivery pipeline 43 is provided with a delivery pump 45, and the output end is provided with a micro-nano bubble collector 44. The delivery pump 45 is connected to the collection medium inlet 46, and the micro-nano bubble collector 44 is connected to the collection medium outlet 47. The collection medium 41 enters the delivery pipeline 43 through the collection medium inlet 46 and the delivery pump 45, and contacts with the top of the dissolved gas liquid 1 in the liquid storage tank 2 to form a liquid-liquid interface 42. Figure 3 As shown, when the solid-liquid interface 11 moves upward and generates micro-nano bubbles 12, the generated micro-nano bubbles 12 pass through the liquid-liquid interface 42 and float into the collection medium 41, as shown in FIG. Figure 4 As shown, the shear flow generated by the delivery pump 45 pushes the micro-nano bubbles 12 into the bubble collector 44 .

[0060] Example 3

[0061] A micro-nano bubble generating device based on solidification segregation includes a bubble generating unit for generating micro-nano bubbles by freezing a solidified liquid phase and a bubble collecting unit for transporting and storing micro-nano bubbles. The bubble generating unit includes a low temperature platform for freezing a dissolved gas liquid, and a liquid storage tank for storing the dissolved gas liquid and connecting the collecting unit. The bubble collecting unit includes an oil pump and a pipeline for transporting micro-nano bubbles and a bubble collector for storing bubbles.

[0062] A low temperature platform is used to create sufficient supercooling conditions. The dissolved gas liquid in the liquid storage tank freezes and solidifies, and the solid-liquid interface moves from the bottom to the top. Bubbles are generated above the interface, and when approaching the oil interface, a large number of micro-nano bubbles pass through the oil interface and float into the oil layer. The trapezoidal structure opening design allows the bubbles to converge faster into the transport pipeline. Then the shear flow generated by the oil pump pushes the bubbles into the bubble collector.

[0063] Example 4

[0064] A micro-nano bubble generating device based on solidification segregation, based on Example 2, this embodiment also includes the following preferred details:

[0065] The working temperature of the low temperature platform is controlled to be below -10°C, and the working temperature of the low temperature platform is set according to the advancement speed of the ice-water interface from bottom to top.

[0066] The bottom of the water storage tank is made of copper material with good chemical stability, not easy to corrode or oxidize, and high thermal conductivity.

[0067] The liquid storage tank is designed with a trapezoidal opening, and the bottom angle and height of the trapezoidal structure are reasonable, and the height of the oil interface is reasonable, which is convenient for bubbles to float up and enter the oil.

[0068] The advancing speed of the solid-liquid interface is generally less than 10 μm / s.

[0069] The dissolved gas liquid is pure water with dissolved oxygen.

[0070] The oil medium introduced into the transport pipeline of the micro-nano bubble generating device is a silicone oil liquid with a viscosity of 1 to 200 cs.

[0071] The oil pump (delivery pump) used in this embodiment is an IH65-40-200 stainless steel chemical centrifugal pump produced by Nanjing Longli Machinery Manufacturing Co., Ltd.

[0072] Driven by the shear flow of the oil pump, the flow rate of the transported silicone oil is 2 to 3 mm / s.

[0073] The micro-nano bubble generation method using the micro-nano bubble generation device comprises the following steps:

[0074] Open the liquid inlet, inject an appropriate amount of dissolved gas liquid into the liquid storage tank, close the liquid inlet when the liquid level reaches the lower bottom surface of the trapezoidal structure opening, and then fill the transport pipeline with silicone oil. Place the entire device on a low-temperature platform with a set supercooling degree. As the temperature of the medium in the liquid storage tank gradually decreases to below the solidification point, the solidification surface moves from the bottom of the liquid storage tank to the top, and bubbles are generated above the solid-liquid interface. When the solidification surface advances to the oil interface, a large number of bubbles are generated above the solid-liquid interface. As the solidification surface continues to advance upward to the oil interface, the bubbles pass through the oil interface and float to the transport pipeline filled with silicone oil. Driven by the shear flow of the oil pump, a large number of micro-nano bubbles are transported to the bubble collector. After waiting for the solidification to end, close the low-temperature platform and wait for the solid to melt into liquid, and then perform the above steps again to continue to collect some of the remaining micro-nano bubbles trapped in the solid phase during the freezing process. When the bubbles in the dissolved gas liquid in the liquid storage tank have been basically collected, open the liquid inlet and the liquid outlet, replace the dissolved gas liquid in the liquid storage tank and repeat the above steps to continue collecting micro-nano bubbles.

[0075] The working principle of this embodiment is to utilize the regular arrangement of solid phase molecules during the solidification process, so that the substance to be extracted dissolved in the original liquid phase will be segregated, enriched and nucleated at the front of the solidification phase interface, and form bubbles or micro-droplets. For example, during the freezing process of water, as the solidification interface moves from the bottom to the top, bubbles are gradually generated above the ice-water interface. Under the action of buoyancy, a large number of micro-nano bubbles generated float up and enter the oil layer. Since the freezing point of silicone oil is much lower than the freezing point of water, and gas is insoluble in silicone oil, the floating micro-nano bubbles are transported to the collector under the shear flow of the oil pump.

[0076] Example 5

[0077] A freezing-based micro-nano bubble generating device includes a low-temperature platform 3 and a refrigerant inlet 31 and a refrigerant outlet 32 ​​connected to the low-temperature platform. A water storage tank (liquid storage tank 2) is placed on the low-temperature platform 3, and a water inlet (liquid storage tank liquid inlet 21) and a water outlet (liquid storage tank liquid outlet 22) are provided on the water storage tank. An oil pump (delivery pump 45) with an oil inlet (collection medium inlet 46), a transport pipeline 43 and a bubble collector (micro-nano bubble collector 44) are connected above the water storage tank, and an oil outlet (collection medium outlet 47) is connected above the bubble collector. The device is placed on the low-temperature platform 3 as a whole and can be in direct contact with the low-temperature platform 3 through a thermally conductive adhesive.

[0078] The working temperature of the low temperature platform 3 is controlled to be lower than -10°C, and the working temperature of the low temperature platform 3 is set according to the advancement speed of the ice-water interface from bottom to top. The coolant circulating in the circulating cooling device (low temperature platform 3) is a 40% mass concentration of ethylene glycol aqueous solution.

[0079] The bottom of the water storage tank is made of copper, which has good chemical stability, is not easy to corrode or oxidize, and has high thermal conductivity.

[0080] The top of the water storage tank is designed as a trapezoidal opening, and the bottom angle and height of the trapezoidal structure are reasonable, and the height of the oil interface (liquid-liquid interface 42) is reasonable, which makes it easier for bubbles to float up and enter the oil.

[0081] The dissolved gas liquid 1 is pure water with dissolved oxygen, and the micro-nano bubbles containing oxygen are widely used in various industries.

[0082] The advancing speed of the ice-water interface (solid-liquid interface 11) is generally less than 10 μm / s, which avoids the generation of a large number of trapped bubbles due to the freezing speed being too fast, and can generate more micro-nano bubbles 12 to float into the oil and be collected.

[0083] The oil medium (collecting medium 41) introduced into the transport pipeline 43 is silicone oil with a viscosity of 1 to 200 cs. The density of silicone oil is less than that of water, and the freezing point of silicone oil is much lower than that of water. The properties of silicone oil are stable and the collected oxygen bubbles are insoluble in silicone oil.

[0084] Driven by the shear flow of the oil pump, the flow velocity of the transported silicone oil is 2 to 3 mm / s. The flow velocity is smooth and stable, which avoids the merging and rupture of micro-nano bubbles and is conducive to the transportation and collection of micro-nano bubbles.

[0085] The above-mentioned freezing-based micro-nano bubble generating device, when used in a specific embodiment, comprises the following steps:

[0086] Step 1: First, fill a cylindrical container pipe with a radius of 2 cm and a height of 3 cm with oxygen-rich pure water, from the water surface to the lower bottom surface of the trapezoidal structure opening, where the bottom angle of the trapezoidal structure is 30°. Then fill a cylindrical transport pipe with a length of 8 cm and a radius of 1 cm and the connected trapezoidal structure opening with a silicone oil with a viscosity of 50 cs.

[0087] Step 2: Place the entire bubble generating device on a low temperature platform with a set supercooling degree. The operating temperature of the low temperature platform is generally set to below -10°C. As the bottom surface temperature decreases, the ice-water interface moves from the bottom to the top at a speed of less than 10 μm / s, and bubbles are generated above the ice-water interface.

[0088] Step 3, when the solidification surface continues to advance to the oil interface, a large number of micro-nano bubbles with a diameter of 10 to 60 μm are generated above the ice-water interface. As the solidification surface continues to advance upward to the oil interface, the bubbles pass through the water-oil interface and float up into the transport pipeline filled with silicone oil.

[0089] Step 4: Under the shear flow of the oil pump, the flow rate of the silicone oil is 3 mm / s, and a large number of micro-nano bubbles generated are collected in a spherical bubble collector with a radius of 2 cm.

[0090] Step 5: After the solidification is completed, turn off the low temperature platform switch and wait for the ice to melt into water again, and repeat the above steps to continue collecting the remaining micro-nano bubbles dissolved in the ice during the freezing process. When the bubbles in the water in the water storage tank have been basically collected, open the water inlet and outlet, replace the pure water in the water storage tank, and repeat the above steps to continue collecting micro-nano bubbles.

[0091] like Figure 5 It is an experimental measurement diagram of bubbles floating up into oil in a Hele-Shaw device. When the solidification surface 13 gradually rises to the oil interface (liquid-liquid interface 42), a large number of micro-nano bubbles 12 are generated above the ice-water interface (solid-liquid interface 11). Figure 6 This is a histogram of the particle sizes of micro-nano bubbles collected in the actual measurement experiment. It can be seen that a large number of micro-nano bubbles with a size of 10 to 60 μm can be collected through this device.

[0092] Experiments show that the use of a purely physical process based on solidification phase change can solve the problem of introducing impurities when preparing micro-nano bubbles using chemical methods, thereby generating a large number of pure and pollution-free micro-nano bubbles. At the same time, by changing the working temperature of the cryogenic platform, the advancement speed of the ice-water interface can be controlled to control the number and size trend of micro-nano bubbles generated: the lower the temperature of the cryogenic platform, the faster the advancement speed of the ice-water interface, the more micro-nano bubbles are generated, and the larger the diameter; the higher the temperature of the cryogenic platform, the slower the advancement speed of the ice-water interface, the fewer micro-nano bubbles are generated, and the smaller the diameter. By using different types of dissolved gas liquids, the types of micro-nano bubbles containing different gases can be obtained, thereby achieving more diverse bubble collection.

[0093] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A micro-nano bubble generating device, characterized in that: It comprises a liquid storage tank (2) for storing dissolved gas liquid (1) and a low temperature platform (3) for freezing the dissolved gas liquid (1); The low temperature platform (3) causes the gas-dissolving liquid (1) in the liquid storage tank (2) to freeze and solidify, causing the solid-liquid interface to shift and generate micro-nano bubbles.

2. The micro-nano bubble generating device according to claim 1, characterized in that: The gas-dissolving liquid (1) is pure water in which oxygen is dissolved.

3. The micro-nano bubble generating device according to claim 1, characterized in that: The low temperature platform (3) has an operating temperature below -10°C.

4. The micro-nano bubble generating device according to claim 1, characterized in that: The solid-liquid interface moving speed is less than 10 μm / s.

5. The micro-nano bubble generating device according to claim 1, characterized in that: The low-temperature platform (3) is arranged at the bottom of the liquid storage tank (2), the solid-liquid interface moves from the bottom to the top, and micro-nano bubbles are generated above the solid-liquid interface.

6. The micro-nano bubble generating device according to claim 5, characterized in that: The top of the liquid storage tank (2) is connected to a micro-nano bubble collection component (4), and the micro-nano bubble collection component (4) comprises a collection medium (41); The collecting medium (41) is a liquid medium with a density lower than that of the gas-dissolving liquid (1) and is immiscible with the gas-dissolving liquid (1). The top of the gas-dissolving liquid (1) contacts the collecting medium (41), and a liquid-liquid interface (42) exists at the contact point.

7. The micro-nano bubble generating device according to claim 6, characterized in that: The collecting medium (41) is a silicone oil liquid with a viscosity of 1 to 200 cs.

8. The micro-nano bubble generating device according to claim 6, characterized in that: The micro-nano bubble collection component (4) further comprises a transport pipeline (43), a micro-nano bubble collector (44), a delivery pump (45), a collection medium inlet (46) and a collection medium outlet (47); The top of the liquid storage tank (2) is connected to a transport pipeline (43), the transport pipeline (43) is connected to a micro-nano bubble collector (44) and a transport pump (45), a collection medium outlet (47) is provided on the micro-nano bubble collector (44), and the transport pump (45) is connected to a collection medium inlet (46), the collection medium (41) enters the transport pipeline (43) through the collection medium inlet (46) and the transport pump (45), and contacts the top of the dissolved gas liquid (1) to form a liquid-liquid interface (42).

9. A method for generating micro-nano bubbles, characterized in that: The method is carried out using the micro-nano bubble generating device as claimed in any one of claims 1 to 8, comprising the following steps: using a low temperature platform (3) to create supercooling conditions, freezing and solidifying the dissolved gas liquid (1) in the liquid storage tank (2), shifting the solid-liquid interface, and generating micro-nano bubbles at the solid-liquid interface.

10. The micro-nano bubble generation method according to claim 9, characterized in that: The specific steps include: A low-temperature platform (3) located at the bottom of the liquid storage tank (2) creates supercooling conditions, the dissolved gas liquid (1) in the liquid storage tank (2) freezes and solidifies, the solid-liquid interface moves from the bottom to the top, and micro-nano bubbles are generated above the solid-liquid interface. The generated micro-nano bubbles pass through the liquid-liquid interface (42) and float up into the collection medium (41), and the shear flow generated by the delivery pump (45) pushes the micro-nano bubbles into the bubble collector (44).

Images