Industrial-grade ultra-high concentration nanobubble generating system and preparation method

Abstract

This application discloses an industrial-grade ultra-high concentration nanobubble generation system and preparation method. The system includes a raw water treatment unit for filtering, heating, and pressurizing industrial water and outputting high-pressure water; a carbon dioxide treatment unit for storing carbon dioxide and heating and pressurizing the output carbon dioxide; a premixing unit for thoroughly mixing the high-pressure water from the raw water treatment unit and the carbon dioxide from the carbon dioxide treatment unit, the premixing unit having a multi-stage shear structure for progressively refining the mixture of carbon dioxide and high-pressure water to form primary nanobubbles; and an aeration and throttling unit for receiving and stirring the primary nanobubbles output from the premixing unit to generate finished nanobubbles, and for replenishing the carbon dioxide treatment unit with aeration. This system is a stable, continuous, and industrially scalable ultra-high concentration nanobubble generation system.

Description

Technical Field

[0001] This application belongs to the field of high-concentration nanofluid preparation technology, specifically relating to an industrial-grade ultra-high concentration nanobubble generation system and preparation method. Background Technology

[0002] The physicochemical properties of nanobubbles are closely related to their concentration, especially in ultra-high concentration environments (≥10). 9 Nanobubbles generated at concentrations of 100 nanobubbles per mL exhibit stronger collective interface effects (interface area per unit volume increased by 2-3 orders of magnitude), ultra-long lifespan (up to 6-12 months or more, 10-100 times that of conventional concentration nanobubbles), and more stable synergistic properties (forming aerosol network structures). These characteristics make them revolutionary in cutting-edge fields such as efficient gene / drug delivery, pollutant degradation (degradation rate increased by 10-100 times compared to conventional concentrations), petroleum development, and precision materials synthesis.

[0003] However, current nanobubble preparation technology remains largely confined to laboratory scale due to limitations in understanding its mechanisms and equipment. Current mainstream nanobubble preparation technologies generally suffer from a disconnect between the "generation" and "stabilization" processes. Although some methods (such as ultrasonic cavitation, hydrodynamic cavitation, and electrolysis) can generate bubbles locally and instantaneously, the overall preparation level remains significantly limited: First, the concentration of the obtained nanobubbles is generally low, typically less than 10⁻⁶. 8 mL -1 The current methods are insufficient to meet the application requirements of enhanced mass transfer and efficient reaction. Furthermore, the uneven bubble size distribution, with most bubbles exceeding 200 nm and even falling within the micro-nano critical range, hinders the full realization of nanoscale effects. Secondly, regarding stability, the complex dynamic interactions between high-density bubbles (such as electrostatic shielding and hydrodynamic coupling) have not been effectively controlled, leading to rapid aggregation, dispersion, and even annihilation of generated bubbles, making it difficult to balance macroscopic concentration and stability. Moreover, existing theoretical systems are mostly based on classical nucleation-growth models under low-concentration conditions, which are insufficient to accurately describe the evolutionary behavior of "ultra-high concentration" non-equilibrium systems, lacking effective guidance for the preparation of high-concentration nanobubbles. At the engineering implementation level, existing devices are mostly laboratory-scale (such as ultrasonic generators and microchannel reactors), with processing capacities typically not exceeding 0.5 m³. 3 The operating time is typically less than 100 hours, and key components are difficult to withstand industrial-grade high pressure (≥30 MPa) and high flow rate scouring. This severely restricts the development of nanobubble technology towards high concentration, continuous operation, and large-scale production. Summary of the Invention

[0004] The purpose of this application is to provide an industrial-grade ultra-high concentration nanobubble generation system and its preparation method, achieving nanobubble generation at ultra-high concentrations of 9.0 × 10⁻⁶. 9 Stable and continuous generation under conditions of particles / mL and ultra-low particle size ≤50 nm, and capable of industrial-scale production.

[0005] To achieve the above objectives, this application provides an industrial-grade ultra-high concentration nanobubble generation system, comprising: The raw water treatment unit is connected to the industrial water supply pipeline through a large-diameter interface. The raw water treatment unit is used to filter, heat and pressurize industrial water and output high-pressure water. A carbon dioxide processing unit is used to store carbon dioxide and heat and pressurize the output carbon dioxide. The premixing preparation unit is connected to the raw water treatment unit near the bottom and to the carbon dioxide treatment unit at the top. This unit is used to efficiently swirl and mix the high-pressure water supplied by the raw water treatment unit with the supercritical CO2 supplied by the carbon dioxide treatment unit to form a uniformly distributed gas-liquid mixture. The premixing preparation unit is equipped with a multi-stage shearing structure, including a throttling orifice plate with a gradually narrowing flow channel. The synergistic effect of the throttling orifice plate and the high-speed fluid, combined with the gradually narrowing flow channel, can increase the flow velocity of the gas-liquid mixture to 5-6 m / s. The multi-stage shearing structure is used to perform stepwise cavitation and breakup of the gas-liquid mixture to initially refine the bubble particle size from the micrometer level to 200-300 nm and increase the bubble nucleation density. The gas replenishment and throttling unit is connected to the outlet of the premixing preparation unit, and its gas replenishment port is connected to the carbon dioxide treatment unit. This unit receives the primary nanobubbles output from the premixing preparation unit and replenishes gaseous CO2 through the gas replenishment chamber to increase the bubble nucleation density. The gas replenishment and throttling unit includes a throttling valve assembly. When the gas-liquid mixture enters the throttling valve assembly, a strong cavitation effect is generated under the high-pressure throttling action of 30-50MPa, which further shears and pulverizes the primary nanobubbles to form finished nanobubbles. The average particle size of the finished nanobubbles is ≤50nm, and the concentration is ≥9.0×10⁻⁶. 9 per mL.

[0006] In some embodiments, the premixing preparation unit includes a reaction vessel with a high-pressure cavity structure inside. The multi-stage shearing structure includes a throttling orifice plate arranged along the flow direction of the mixing medium and a positioning plate for mounting the throttling orifice plate. The throttling orifice plate has a throttling orifice extending axially, and a tapered flow channel is formed inside the throttling orifice for the mixing medium to pass through. The tapered flow channel is a three-section variable diameter flow channel structure, including three sections with successively decreasing inner diameters along the fluid flow direction. The inlet end of the tapered flow channel is located on the high-pressure side and at the lower end, and the outlet end is located on the low-pressure side and at the upper end. Two positioning holes are symmetrically arranged on the outside of the throttling orifice for positioning and fixing the throttling orifice plate. Multiple mounting positioning posts are evenly distributed circumferentially on the outer edge of the positioning plate for fastening assembly with external pipelines or valve seats.

[0007] In some embodiments, the carbon dioxide treatment unit includes: The carbon dioxide storage tank is a high-pressure vessel with a gaseous output channel and a liquid output channel inside. The top and bottom of the carbon dioxide storage tank are respectively provided with gaseous carbon dioxide outlet and liquid carbon dioxide outlet. The first-stage booster module is connected to both the inlet and the outlets of gaseous and liquid carbon dioxide. The outlet is connected to the inlet of the buffer tank. The first-stage booster module is used to boost the carbon dioxide output from the gaseous and liquid carbon dioxide outlets and deliver it to the buffer tank. The buffer tank has an internal elastic pressure balancing structure and is used to buffer the pressure of the gas-liquid mixture of carbon dioxide after the first stage of pressurization. The secondary booster module is connected to the outlet of the buffer tank. The secondary booster module is used to boost the carbon dioxide output from the outlet of the buffer tank in two stages. The first heating module is used to regulate the temperature of the carbon dioxide after secondary pressurization.

[0008] In some embodiments, the raw water treatment unit includes, in series: The water inlet module is connected to the industrial water supply pipeline through the water supply pipeline, which is equipped with a one-way check valve. The filter module is used to filter particulate impurities in the industrial water output from the inlet module. The second heating module is used to heat the filtered industrial water. The outlet end of the second heating module is equipped with a temperature detection device for real-time monitoring of the water temperature. The pressurization module is used to pressurize the heated water to a preset pressure.

[0009] In some embodiments, the top of the reaction vessel has a first inlet, and the side wall has a second inlet and a bubble outlet. The bubble outlet is located above the second inlet. The first inlet is connected to the carbon dioxide treatment unit, and the carbon dioxide from the carbon dioxide treatment unit is supplied to the reaction vessel through the first inlet. The second inlet is connected to the raw water treatment unit, and the high-pressure water from the raw water treatment unit is supplied to the reaction vessel through the second inlet. The bubble outlet is connected to the gas replenishment and throttling unit, and the primary nanobubbles discharged from the bubble outlet enter the gas replenishment and throttling unit through a pipe.

[0010] In some embodiments, the gas replenishment and throttling unit is a high-pressure container structure with a gas replenishment chamber inside. The top of the gas replenishment chamber is connected to the carbon dioxide treatment unit through a pressure-holding pipeline. When the gas storage pressure of the carbon dioxide treatment unit drops, the gas replenishment chamber replenishes carbon dioxide to the carbon dioxide treatment unit through the pressure-holding pipeline. A bubble delivery pipeline is connected between the gas replenishment and throttling unit and the bubble outlet. A low-speed stirring paddle is provided inside the gas replenishment chamber to stir the primary nanobubbles entering the gas replenishment chamber. A throttling valve assembly is provided on the bubble delivery pipeline.

[0011] A second aspect of this application provides a method for preparing industrial-grade ultra-high concentration nanobubbles, applied to the system described above. The preparation method includes the following steps: S10: The industrial water is pretreated by filtration, heating and pressurization in the raw water treatment unit and then delivered to the premixing preparation unit. S20: Turn on the carbon dioxide processing unit to perform secondary pressurization and heating treatment on the carbon dioxide so that the carbon dioxide is in a supercritical state and is then transported to the premixing preparation unit; S30: In the premixing preparation unit, high-pressure water and supercritical carbon dioxide are fully mixed by gas-liquid contact under the action of multi-level shear structure, so that carbon dioxide forms primary nanobubbles in high-pressure water. S40: The primary nanobubbles are fed into the gas-injection throttling unit and stirred to generate the finished nanobubbles. Among them, the concentration of the finished nanobubble product is ≥9.0×10⁻⁶. 9 Particles / mL, average particle size ≤50nm.

[0012] In some implementations, step S20 includes: The gaseous carbon dioxide outlet and liquid carbon dioxide outlet of the carbon dioxide storage module are opened, and the gas-liquid output ratio of carbon dioxide is maintained by flow regulation, so that carbon dioxide is stably supplied to the premixing preparation unit. Carbon dioxide enters the first-stage booster module according to the preset gas-liquid output ratio. The first-stage booster module pressurizes the gas to the predetermined pressure and then sends it into the buffer tank. The internal elastic pressure balancing structure reduces pressure fluctuations and stabilizes the gas pressure. After being pressurized and stabilized by the first-stage pressurization module, the carbon dioxide enters the second-stage pressurization module, where it is further pressurized to the high pressure required for nanobubble preparation. The carbon dioxide, after being pressurized in two stages, is sent to the first heating module and heated to a preset temperature so that the carbon dioxide is in a supercritical state.

[0013] In some implementations, step S30 includes: High-pressure water and supercritical carbon dioxide are introduced into the reaction vessel of the premixing preparation unit, respectively. Through multi-stage mixing and shearing structure, full gas-liquid contact is achieved, so that carbon dioxide forms primary nanobubbles in the water. At the same time, the gas volume fraction is kept within a predetermined range by adjusting the flow rate. After undergoing multiple shearing processes and fluid flow rate regulation, the primary nanobubble mixture gradually refines the bubbles, forming a nanobubble solution with uniform size and high concentration.

[0014] In some implementations, step S40 includes: Open the bubble outlet of the premix preparation unit to deliver primary nanobubbles to the gas replenishment and throttling unit through the bubble delivery pipeline; While the carbon dioxide processing unit supplies carbon dioxide to the premixing preparation unit, it also replenishes the gas supply chamber with carbon dioxide through the pressure-maintaining pipeline. Turn on the low-speed stirring paddle in the air replenishment chamber to stir the primary nanobubbles and the replenished carbon dioxide in the air replenishment chamber to form a high-concentration carbon dioxide nanobubble product.

[0015] Through the above technical solution, the raw water treatment unit is connected to the industrial water supply pipeline. The raw water treatment unit filters, heats, and pressurizes the industrial water and outputs high-pressure water. The carbon dioxide treatment unit stores carbon dioxide and heats and pressurizes the output carbon dioxide. The premixing preparation unit is connected to the raw water treatment unit near the bottom and to the carbon dioxide treatment unit at the top. The premixing preparation unit thoroughly mixes the high-pressure water supplied by the raw water treatment unit and the carbon dioxide supplied by the carbon dioxide treatment unit. The premixing preparation unit has a multi-stage shearing structure, which is used to progressively refine the mixture of carbon dioxide and high-pressure water to form primary nanobubbles. The air replenishment and throttling unit is connected to both the outlet of the premixing preparation unit and the carbon dioxide treatment unit. The air replenishment and throttling unit receives the primary nanobubbles output from the premixing preparation unit, stirs and processes them to generate finished nanobubbles, and can also replenish air to the carbon dioxide treatment unit. This application can treat industrial-grade raw water. Through large-scale media adaptation and improvement of the raw water treatment unit and the carbon dioxide treatment unit, it can achieve large-scale generation of industrial-grade ultra-high concentration nanobubbles.

[0016] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the industrial-grade ultra-high concentration nanobubble generation system of this application; Figure 2 This is a schematic diagram of the perforated plate structure in the premix preparation unit of this application; Figure 3 This is a schematic diagram of the process for preparing industrial-grade ultra-high concentration nanobubbles according to this application; Figure 4 Morphology of ultra-high concentration CO2 nanobubbles (NTA) prepared for the industrial-grade ultra-high concentration nanobubble generation system of this application.

[0018] Explanation of reference numerals in the attached figures 1. Raw water treatment unit; 35. Installation positioning column; 3. Premix preparation unit; 36. Positioning plate; 31. Throttling orifice plate; 2. Carbon dioxide treatment unit; 32. Throttling orifice; 4. Air replenishment and throttling unit; 33. Positioning hole; 41. Pressure holding pipeline; 34. Gradually narrowing flow channel; 42. Bubble delivery pipeline. Detailed Implementation

[0019] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0020] The following description, with reference to the accompanying drawings, describes an industrial-grade ultra-high concentration nanobubble generation system and preparation method according to this application, which is applicable to industrial scenarios requiring large-scale ultra-high concentration nanobubble fluids, such as oil extraction, industrial wastewater treatment, and biomedicine.

[0021] like Figure 1As shown, this application proposes an industrial-grade ultra-high concentration nanobubble generation system, including a raw water treatment unit 1, a carbon dioxide treatment unit 2, a premixing preparation unit 3, and an air replenishment and throttling unit 4. The raw water treatment unit 1 is connected to an industrial water supply pipeline and is used to filter, heat, and pressurize industrial water to output high-pressure water. The carbon dioxide treatment unit 2 is used to store carbon dioxide and heat and pressurize the output carbon dioxide. The premixing preparation unit 3 is connected to the raw water treatment unit 1 near its bottom and to the carbon dioxide treatment unit 2 at its top. The premixing preparation unit 3 is used to fully mix the high-pressure water supplied by the raw water treatment unit 1 and the carbon dioxide supplied by the carbon dioxide treatment unit 2. The premixing preparation unit 3 is connected to the raw water treatment unit 1 near its bottom and to the carbon dioxide treatment unit 2 at its top. This unit is used to efficiently swirl and mix the high-pressure water supplied by the raw water treatment unit 1 and the supercritical CO2 supplied by the carbon dioxide treatment unit 2 to form... A uniformly distributed gas-liquid mixture system is formed. The premixing preparation unit 3 is equipped with a multi-stage shearing structure, including a throttling orifice plate with a tapered flow channel. The synergistic effect of the throttling orifice plate and the high-speed fluid, combined with the tapered flow channel, can increase the flow velocity of the gas-liquid mixture to 5-6 m / s. The multi-stage shearing structure is used to progressively cavitate and break up the gas-liquid mixture, initially refining the bubble size from micrometers to 200-300 nm and increasing the bubble nucleation density. The gas replenishment and throttling unit 4 is connected to the outlet of the premixing preparation unit 3, and its gas replenishment port is connected to the carbon dioxide treatment unit 2. This unit receives the primary nanobubbles output from the premixing preparation unit 3 and replenishes gaseous CO2 through the gas replenishment chamber to increase the bubble nucleation density. The gas replenishment and throttling unit 4 includes a throttling valve assembly. When the gas-liquid mixture enters the throttling valve assembly, a strong cavitation effect is generated under the high-pressure throttling action of 30-50 MPa, further shearing and pulverizing the primary nanobubbles to form the finished nanobubble product. Figure 4 As shown, the average particle size of the finished nanobubble product is ≤50nm, and the concentration is ≥9.0×10⁻⁶. 9 per mL.

[0022] In this embodiment, the carbon dioxide treatment unit 2 achieves a stable supply of high-pressure carbon dioxide through storage, pressure regulation, pressurization, and heating. This carbon dioxide is initially mixed with high-pressure water pretreated by the raw water treatment unit 1 in the premixing preparation unit 3. Then, through multi-stage shearing and cavitation effects of a multi-stage shear structure, the bubbles are gradually refined. Finally, a high-concentration, highly stable nanobubble aqueous solution is formed under the control of the gas replenishment and throttling unit 4. The premixing preparation unit 3 is used for premixing the pretreated high-pressure water and carbon dioxide gas and preparing nanobubbles; it is the core functional unit for achieving ultra-high concentration nanobubble generation. This premixing preparation unit 3 is connected to the raw water treatment unit 1 and the carbon dioxide treatment unit 2. By guiding the gas-liquid medium to fully contact and exchange energy under controlled pressure and flow conditions, the carbon dioxide in the water undergoes continuous refinement and forms a stable distribution of nanobubbles. This application can treat industrial-grade raw water. By improving the large-scale media adaptation treatment of the raw water treatment unit 1 and the carbon dioxide treatment unit 2, the large-scale generation of industrial-grade ultra-high concentration nanobubbles can be achieved.

[0023] In some embodiments, the premix preparation unit 3 includes a reaction vessel, the interior of which is a high-pressure chamber structure, such as... Figure 2 As shown, the multi-stage shear structure includes a throttling orifice plate arranged along the flow direction of the mixing medium and a positioning plate 36 for mounting the throttling orifice plate 31. The throttling orifice plate 31 has a throttling orifice 32 extending through it axially. The throttling orifice 32 has a tapered flow channel 34 for the mixing medium to pass through. The tapered flow channel 34 is a three-section variable diameter flow channel structure, including three sections whose inner diameter decreases sequentially along the fluid flow direction. The inlet end of the tapered flow channel 34 is located on the high-pressure side and at the lower end, and the outlet end is located on the low-pressure side and at the upper end. Two positioning holes 33 are symmetrically arranged on the outside of the throttling orifice 32. The positioning holes 33 are used to position and fix the throttling orifice plate 31. Multiple mounting positioning posts 35 are evenly distributed around the outer edge of the positioning plate 36 for fastening assembly with external pipelines or valve seats.

[0024] The reaction vessel employs a multi-stage hydraulic shear system, connected to the carbon dioxide treatment unit 2 and the raw water treatment unit 1 via two pipelines. This unit features a three-stage series of gradually narrowing flow channels with orifice diameters of 200 nm, 120 nm, and 50 nm, respectively. The gradually narrowing flow channel 34 comprises a first-stage orifice plate channel, a second-stage orifice plate channel, and a third-stage orifice plate channel, all with progressively decreasing inner diameters and interconnected. During operation, a mixture of high-pressure carbon dioxide and high-pressure water flows through each orifice plate: firstly, cavitation is induced by throttling in the first-stage orifice plate channel, causing bubbles to collapse and break down under sudden pressure changes; then, after passing through the second-stage orifice plate channel, high-intensity shearing force is generated under the shearing action of the high-speed fluid, mechanically tearing and refining the bubbles. Finally, through the third-stage orifice plate channel, the bubbles are gradually sheared to the nanoscale, ultimately forming a high-pressure nanofluid with a uniform and fine particle size distribution. This application utilizes the synergistic effect of a tapered fluid channel and a multi-stage shear structure to achieve efficient multi-stage shearing of the gas-liquid mixture, enabling repeated bubble generation and high-density enrichment. This significantly increases the concentration of nanobubbles per unit volume while efficiently refining bubbles to the nanoscale. In this embodiment, a perforated plate structure involving three variable-diameter flow channels is used, where the pore size of the fluid channel decreases sequentially. This causes the bubble size to continuously decrease and become more uniform as the mixed medium of carbon dioxide and high-pressure water flows through the perforated plate structure, thereby significantly increasing the concentration of nanobubbles per unit volume of water.

[0025] like Figure 2 As shown, the orifice plate 31 adopts a three-section variable diameter flow channel design. The flow channel is set through the orifice plate axially, with the inlet end located at the lower end of the structure (high pressure side) and the outlet end located at the upper end of the structure (low pressure side).

[0026] like Figure 2 As shown, when the mixed medium passes through the orifice plate at high speed, the throttling and pressure reduction of the medium induces cavitation, and a large number of microbubbles are generated under the shearing action of the high-speed radial flow. The microbubble solution enters the flow channel of the next orifice plate along the flow channel of the previous stage and is further torn and refined to form nanobubbles, thereby achieving the multi-stage shearing effect described above. This application, through comprehensive control of the gas-liquid mixing state and flow conditions, enables the generated nanobubbles to have good stability and dispersibility, making it suitable for the continuous preparation process of ultra-high concentration nanobubbles.

[0027] In some embodiments, the carbon dioxide processing unit 2 includes a carbon dioxide storage tank, a primary pressurization module, a buffer tank, a secondary pressurization module, and a first heating module. The carbon dioxide storage tank is a high-pressure vessel structure used to store and stably supply carbon dioxide gas to the system. The carbon dioxide storage tank has a gaseous output channel and a liquid output channel inside. Gaseous carbon dioxide outlets and liquid carbon dioxide outlets are respectively located at the top and bottom of the storage tank. The output ratio of carbon dioxide in different physical states can be controlled by adjusting the opening of control valves on the connecting pipelines, thereby controlling the carbon dioxide output state and ensuring that the carbon dioxide entering subsequent processing units is in a stable and controllable supply state. The inlet of the first-stage pressurization module is connected to both the gaseous carbon dioxide outlet and the liquid carbon dioxide outlet. The outlet is connected to the inlet of the buffer tank. The first-stage pressurization module is used to pressurize the carbon dioxide output from the gaseous carbon dioxide outlet and the liquid carbon dioxide outlet and deliver it to the buffer tank. The buffer tank has an elastic pressure balancing structure inside and is used to buffer the pressure of the gas-liquid mixed carbon dioxide after the first-stage pressurization. The inlet of the second-stage pressurization module is connected to the outlet of the buffer tank. The second-stage pressurization module is used to pressurize the carbon dioxide output from the outlet of the buffer tank in the second stage. The first heating module is used to regulate the temperature of the carbon dioxide after the second-stage pressurization.

[0028] The primary booster module employs a diaphragm-type high-pressure structure (306 stainless steel diaphragm booster pump), entirely constructed of stainless steel. Its inlet pressure is matched to the working pressure of the carbon dioxide storage tank, while its outlet pressure is set to a boosted state higher than the storage pressure of the carbon dioxide storage tank, meeting the needs of subsequent high-pressure mixing and nanobubble generation. The rated flow rate of this primary booster pump maintains a predetermined ratio with the raw water treatment unit 1 (for example, the gas-liquid volume ratio can be set to a range of 1:3-1:5), ensuring that the gas-liquid volume ratio entering the system is within a range conducive to nanobubble formation.

[0029] The buffer tank is a high-pressure vessel structure used for pressure buffering and stabilization of carbon dioxide after the first-stage pressurization. An elastic pressure balancing structure is installed inside the buffer tank to absorb pressure fluctuations generated during the first-stage pressurization process, thereby significantly reducing pressure instability entering subsequent units. This elastic pressure balancing structure can be a 2-5mm thick nitrile rubber pressure balancing diaphragm. Pressure monitoring and safety protection components are installed at the top of the buffer tank to ensure the safety and stability of the system under high-pressure operating conditions.

[0030] The secondary booster module employs a reciprocating high-pressure structure (306 stainless steel reciprocating plunger pump), with its inlet pressure matched to the output pressure of the buffer tank. Further pressurization within the secondary booster module brings the carbon dioxide to the high-pressure conditions required for nanobubble preparation. This secondary booster pump maintains minimal pressure fluctuations during operation, providing stable pressure conditions for gas-liquid mixing and nanobubble refinement.

[0031] The first heating module regulates the temperature of the carbon dioxide after secondary pressurization, ensuring it is in a state conducive to dissolution and foaming before entering the subsequent premixing preparation unit 3. Furthermore, by controlling the heating power and target temperature, the carbon dioxide can be brought to the appropriate thermodynamic conditions for efficient nanobubble formation. A temperature monitoring element is installed at the outlet of the heating device to monitor the carbon dioxide temperature in real time, ensuring that the carbon dioxide output from the outlet of the first heating module meets the temperature requirements for bubble preparation.

[0032] In summary, the carbon dioxide processing unit 2 maintains a dynamic and stable input of carbon dioxide gas through a fixed ratio of mixed carbon dioxide output, a buffer tank, and multi-stage pressurization, thereby maintaining stable pressure inside the carbon dioxide storage tank and solving the problem of stability in the continuous supply of high-pressure gas.

[0033] In some embodiments, the raw water treatment unit 1 includes an inlet module, a filtration module, a second heating module, and a pressurization module connected in series. The inlet module is connected to an industrial water supply pipeline via the supply pipeline, which is equipped with a one-way check valve. The filtration module is used to filter particulate impurities in the industrial water output from the inlet module. The second heating module is used to heat the filtered industrial water, and its outlet end is equipped with a temperature sensor for real-time monitoring of the water temperature. The pressurization module is used to pressurize the heated water to a preset pressure.

[0034] The inlet of the water inlet pipe uses a DN200 306 stainless steel flange for connection to the industrial piping system. A pressure sensor is installed at this interface to monitor the inlet pressure in real time, and a one-way check valve is connected in series to prevent backflow of fluid under high pressure conditions, thereby ensuring the safety and stability of the system operation.

[0035] The filtration module is a two-stage series filter, made entirely of 306 stainless steel. The first-stage filtration unit removes larger particulate impurities from the raw water, while the second-stage filtration unit further removes finer particles, effectively reducing the interference of impurities on the subsequent high-pressure mixing and nanobubble generation processes, thus providing clean water conditions for the formation of stable, high-concentration nanobubbles.

[0036] The second heating module is a tubular heating structure used to regulate the temperature of the industrial water entering the system. By controlling the water temperature, the water is placed in a state conducive to gas dissolution and nanobubble formation, thereby improving the efficiency and stability of nanobubble generation. A temperature sensor is installed at the outlet of the second heating module for real-time monitoring of the outlet water temperature.

[0037] The pressurization module is a plunger-type high-pressure pump used to pressurize the pretreated (filtered and heated) water to the high pressure required for nanobubble preparation. This high-pressure pump can maintain a stable output pressure under continuous operation, thus providing a stable pressure base for the gas-liquid mixing and nanobubble generation process. A safety protection structure and pressure sensor are installed at the pump outlet to ensure safe operation of the system under high pressure conditions.

[0038] In summary, by optimizing and integrating the raw water treatment process, the overall processing capacity and operating efficiency of the system have been improved while ensuring that the water quality meets the requirements for nanobubble preparation. This enables the device to adapt to the needs of continuous and large-scale industrial applications. Furthermore, the raw water treatment unit 1 adopts a large-diameter interface and a low-resistance filtration module, enabling the treatment capacity to reach industrial-grade levels. Combined with a high-pressure water pump, it ensures a continuous and stable supply of high-flow-rate, high-pressure water.

[0039] In some embodiments, the reaction vessel has a first inlet at the top and a second inlet and a bubble outlet on its side wall. The bubble outlet is spaced above the second inlet. The first inlet is connected to the carbon dioxide treatment unit 2, and carbon dioxide from the carbon dioxide treatment unit 2 is supplied to the reaction vessel through the first inlet. The second inlet is connected to the raw water treatment unit 1, and high-pressure water from the raw water treatment unit 1 is supplied to the reaction vessel through the second inlet. In this way, the pretreated high-pressure water and carbon dioxide enter the reaction vessel simultaneously through the two inlets for mixing and reaction. The bubble outlet is connected to the gas replenishment and throttling unit 4, and the primary nanobubbles discharged from the bubble outlet enter the gas replenishment and throttling unit 4 through a pipe for further mixing and stirring to form the finished nanobubble product.

[0040] This application significantly reduces the impact of gas source fluctuations on the nanobubble generation process by synergistically regulating carbon dioxide supply and pressure status, making the concentration and distribution of nanobubbles more stable during the preparation process, and has a clear advantage in terms of operational stability compared with traditional devices.

[0041] In some embodiments, the gas replenishment and throttling unit 4 is a high-pressure container structure with an internal gas replenishment chamber. The top of the gas replenishment chamber is connected to the carbon dioxide treatment unit 2 via a pressure-holding pipeline 41. The primary bubbles generated by the premixing preparation unit 3 are transported to the gas replenishment chamber of the gas replenishment and throttling unit via a bubble delivery pipeline 42. Simultaneously, gaseous carbon dioxide from the carbon dioxide treatment unit 2 is also transported to the gas replenishment chamber of the gas replenishment and throttling unit via the pressure-holding pipeline 41. The primary bubbles and the replenished carbon dioxide are mixed by a stirring paddle in the gas replenishment chamber to increase the carbon dioxide concentration in the mixture and generate the final finished nanobubbles. Furthermore, a throttling valve assembly is also provided on the output pipeline of the gas replenishment and throttling unit 4. The throttling valve assembly further throttles and cavitations the stirred mixture, ultimately producing a finished nanobubble product with high concentration and fine particle size.

[0042] In this embodiment, the gas replenishment and throttling unit 4 is a high-pressure container used to further regulate the gas content and system pressure during the nanobubble preparation process. Its interior is the gas replenishment chamber, with no other areas. Gaseous carbon dioxide from the carbon dioxide treatment unit 2 replenishes this chamber under controlled conditions, and promotes gas dispersion in the water body through slow mixing with the primary bubbles in the chamber. Through the coordinated control of the gas replenishment and throttling processes, the gas-liquid system generates flow and energy change conditions conducive to further bubble refinement and uniform dispersion as it passes through this unit, thereby further reducing the size of the generated bubbles and maintaining a stable distribution. This unit significantly improves the concentration level and stability of nanobubbles in the system, making it suitable for continuous preparation of ultra-high concentration nanobubbles.

[0043] like Figure 3 As shown, the second aspect of this application provides a method for preparing industrial-grade ultra-high concentration nanobubbles, applied to the system described above. The preparation method includes the following steps: S10: The industrial water is pretreated by filtration, heating and pressurization in the raw water treatment unit 1 and then high-pressure water is delivered to the premixing preparation unit 3; S20: Turn on the carbon dioxide treatment unit 2 to perform secondary pressurization and heating treatment on the carbon dioxide so that the carbon dioxide is in a supercritical state and is transported to the premix preparation unit 3; S30: In the premixing preparation unit 3, high-pressure water and supercritical carbon dioxide are fully mixed by gas-liquid contact under the action of multi-level shear structure, so that carbon dioxide forms primary nanobubbles in high-pressure water. S40: The primary nanobubbles are fed into the gas-injection throttling unit 4 and stirred to generate the finished nanobubbles. Among them, the concentration of the finished nanobubble product is ≥9.0×10⁻⁶. 9 Particles / mL, average particle size ≤50nm.

[0044] In this embodiment, industrial raw water is pretreated by filtration, heating, and pressurization. Carbon dioxide undergoes secondary pressurization and heating pretreatment to obtain supercritical carbon dioxide. High-pressure water and supercritical carbon dioxide are then subjected to multi-stage shearing in the premixing preparation unit 3 to obtain primary nanobubbles. Finally, ultra-high concentration nanobubbles are formed in the gas replenishment and throttling unit 4. This invention employs an in-situ preparation method under high pressure conditions, ensuring that the nanobubbles remain in a controlled high-pressure environment throughout their generation and stabilization. This effectively maintains the physical properties of the gas in the water, significantly prolongs the stable existence time of the nanobubbles, and enhances their interfacial activity. This overcomes the technical problem in existing technologies where high activity and stability of nanobubbles are difficult to maintain due to pressure limitations.

[0045] In some implementations, step S20 includes: Open the gaseous carbon dioxide outlet and liquid carbon dioxide outlet of the carbon dioxide storage module, and maintain the gas-liquid output ratio of carbon dioxide by adjusting the flow rate to ensure a stable supply of carbon dioxide to the premixing preparation unit 3. Carbon dioxide enters the first-stage booster module according to the preset gas-liquid output ratio. The first-stage booster module pressurizes the gas to the predetermined pressure and then sends it into the buffer tank. The internal elastic pressure balancing structure reduces pressure fluctuations and stabilizes the gas pressure. After being pressurized and stabilized by the first-stage pressurization module, the carbon dioxide enters the second-stage pressurization module, where it is further pressurized to the high pressure required for nanobubble preparation. The carbon dioxide, after being pressurized in two stages, is sent to the first heating module and heated to a preset temperature so that the carbon dioxide is in a supercritical state.

[0046] In this embodiment, when carbon dioxide is processed in the carbon dioxide processing unit 2, the gaseous and liquid outlets of the carbon dioxide storage unit are first opened. The gas-liquid output ratio is maintained by flow regulation to ensure a stable supply of carbon dioxide to subsequent processing units. The storage pressure is monitored in real time and kept within the range required for high-pressure operation. When the storage pressure drops, gaseous carbon dioxide is automatically replenished through the pressure-maintaining pipeline 41 to ensure a continuous and stable gas supply. Next, the carbon dioxide enters the first-stage pressurization module, where it is pressurized to a predetermined pressure and then sent to a buffer tank. The internal pressure balancing structure reduces pressure fluctuations and stabilizes the gas pressure, providing steady-state conditions for subsequent second-stage pressurization and heating. Finally, the stabilized carbon dioxide enters the second-stage pressurization module, where it is further pressurized to the high pressure required for nanobubble preparation and then sent to the first heating module to be heated to a suitable temperature (approximately 60°C), placing the carbon dioxide in a supercritical state to facilitate the formation of high-concentration nanobubble products in high-pressure water.

[0047] In some implementations, step S30 includes: High-pressure water and supercritical carbon dioxide are introduced into the reaction vessel of the premixing preparation unit 3 respectively. Through multi-stage mixing and shearing structure, full gas-liquid contact is achieved, so that carbon dioxide forms primary nanobubbles in the water. At the same time, the gas volume fraction is kept within a predetermined range by adjusting the flow rate. After undergoing multiple shearing processes and fluid flow rate regulation, the primary nanobubble mixture gradually refines the bubbles, forming a nanobubble solution with uniform size and high concentration.

[0048] In this embodiment, during bubble generation and preparation, high-pressure water and supercritical carbon dioxide are brought into full contact within the high-pressure chamber of the premixing preparation unit 3. Under the action of a multi-stage shear structure, the gas is gradually refined and forms primary nanobubbles by applying continuous action to the gas-liquid system under high pressure. Furthermore, through multi-stage shear action and fluid flow rate regulation, the fluid flow rate can be increased and the gas-liquid interaction effect can be enhanced, thereby improving the generation efficiency and concentration level of nanobubbles.

[0049] Further, step S10 includes: S11: Inject oilfield reinjection water (raw water pressure approximately 0.6 MPa, suspended solids content approximately 80 mg / L) into the device through the inlet interface.

[0050] S12: The coarse filtration module is activated. The raw water passes through the primary coarse filtration unit and the secondary precision filtration unit in sequence to remove particulate impurities in stages. The suspended solids content in the effluent is reduced to about 1 mg / L. At the same time, the resistance of the entire filtration process is kept stable to ensure that the water quality meets the requirements for subsequent nanobubble preparation.

[0051] S13: The filtered water is sent to the heating module, the water temperature is adjusted to about 50°C, and after the outlet temperature stabilizes, it enters the high-pressure water pump.

[0052] S14: Start the high-pressure water pump to pressurize the water to the required high-pressure condition (about 30MPa) and monitor it in real time through the pressure monitoring device to ensure that the water pressure fluctuation is within a controllable range, thereby providing stable high-pressure water conditions for gas-liquid mixing and the formation of nanobubbles.

[0053] Further, step S40 also includes: opening the bubble outlet of the premixing preparation unit 3 to deliver primary nanobubbles to the gas replenishment and throttling unit 4 through the bubble delivery pipeline 42; controlling the carbon dioxide treatment unit 2 to replenish carbon dioxide to the gas replenishment chamber through the pressure-maintaining pipeline 41 while simultaneously supplying carbon dioxide to the premixing preparation unit 3, thereby increasing the gas content in the mixed liquid; turning on the low-speed stirring paddle in the gas replenishment chamber to stir the primary nanobubbles and the replenished carbon dioxide in the gas replenishment chamber to form a high-concentration carbon dioxide nanobubble product; and ensuring the uniform distribution and dissolution of gas in the water body through stirring or fluid homogenization measures. Finally, the throttling adjustment structure is activated to maintain the system pressure at the target value by precisely controlling the outlet pressure, while using the throttling effect to further refine the bubble size, so that the nanobubbles reach the designed particle size range and maintain high concentration and stability.

[0054] To verify the stability of the entire generation system, the entire process was tested. The continuous running time was 1500 hours, with sampling every 24 hours. Each test consisted of three parallel samples, and the average value was taken as the final result. The final test results are as follows: Nanobubble concentration: Specifically, the final concentration of the nanobubble product is stabilized at 9.0 × 10⁻⁶. 9 Cells / mL, concentration fluctuation ≤±3% over 24 hours; Average particle size of nanobubbles: The average particle size of nanobubbles is 50 nm, the particle size distribution deviation is ±5 nm, and the particle size growth rate is ≤3% within 24 hours; Pressure fluctuation of carbon dioxide processing unit 2: The pressure fluctuation of carbon dioxide storage tank is ≤±0.3MPa throughout the process. After buffering, the pressure fluctuation of carbon dioxide is ≤±0.5MPa, ensuring a stable gas supply. The outlet pressure of the gas replenishment throttling unit 4 is stable at 40±0.1MPa, which meets the injection pressure requirements for oil displacement. Total energy consumption of the device: This device consumes 30m³ of energy. 3 When operating at a processing capacity of / h, the total energy consumption is 95kW. h, compared to traditional series-connected nanobubble devices (energy consumption 130kW) h) decreased by 27%; Component status: The 306 stainless steel components of the device (such as mixing tank, cutting unit, valve) show no obvious corrosion or wear after 1500 hours of operation. The filter element of the coarse filter module can be reused after backwashing with clean water, and the cleaning cycle is ≥30 days.

[0055] In-situ displacement experiment results: This in-situ displacement experiment was conducted based on the stabilized nanobubble aqueous solution prepared above. The comparison results with the water-drive baseline are as follows: ① Improved recovery rate: The water drive stage recovery rate was 22.3%. After injecting 0.5 PV of the nanobubble aqueous solution prepared in this invention, the total recovery rate increased to 35.1%, and the stage recovery rate increased by 12.8%, which is 77.8% higher than that of conventional carbon dioxide gas drive (stage recovery rate increased by 7.2%). ② Changes in water content: The water content reached 92.5% at the end of the water flooding. After the nanobubble flooding was stably injected, the water content gradually decreased to 81.2% and remained stable for more than 100 hours without significant rebound, demonstrating the high efficiency of water washing for residual oil. ③ Improved sweep efficiency: Through longitudinal pressure monitoring of the model (pressure monitoring points are set every 100 mm), the planar sweep efficiency of nanobubble-driven water ... ④ Gas channeling suppression effect: During the injection process, the pressure difference between the inlet and outlet is stable at 3.2±0.3MPa, with no sudden pressure drop. The gas-oil ratio produced is stable at less than 55m³ / m³, indicating that the stability of the nanobubbles (lifespan ≥72 hours) can effectively control the CO2 flow rate.

[0056] In summary, the industrial-grade ultra-high concentration nanobubble generation system of this application enables large-scale industrial production. Specifically, firstly, the raw water treatment unit employs a large-diameter interface and a low-resistance filtration module, achieving industrial-scale treatment capacity. Combined with a high-pressure water pump, this ensures a continuous and stable supply of high-flow-rate, high-pressure water. Secondly, the CO2 supply system maintains a dynamic and stable input of CO2 gas through a fixed-ratio mixed CO2 output, a buffer tank, and multi-stage pressurization, thereby maintaining stable pressure within the tank and solving the stability problem of continuous high-pressure gas supply. Thirdly, the secondary treatment by the gas replenishment and throttling unit ensures that the final nanobubble product has high concentration and fine particle size. The entire system has a processing capacity ≥30m³. 3 / d, the concentration of the finished nanobubble product can reach ≥9.0×10 9 With a particle size of ≤50nm and a density of ≥35MPa, this device boasts high pressure (≥35MPa) and continuous operation capability (≥1000 hours). It is suitable for industrial applications such as oil extraction, wastewater treatment, and biopharmaceuticals, and its modular design facilitates operation and maintenance.

[0057] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An industrial-grade ultra-high concentration nanobubble generation system, characterized in that, include: The raw water treatment unit (1) is connected to the industrial water supply pipeline through a large-diameter interface. The raw water treatment unit (1) is used to filter, heat and pressurize industrial water and output high-pressure water. A carbon dioxide processing unit (2) is used to store carbon dioxide and heat and pressurize the output carbon dioxide; The premixing preparation unit (3) is connected to the raw water treatment unit (1) near the bottom and to the carbon dioxide treatment unit (2) at the top. This unit is used to efficiently swirl and mix the high-pressure water delivered by the raw water treatment unit (1) with the supercritical CO2 delivered by the carbon dioxide treatment unit (2) to form a uniformly distributed gas-liquid mixture system. The premixing preparation unit (3) is equipped with a multi-stage shearing structure, which includes a throttling orifice plate. The throttling orifice plate has a tapered flow channel. The synergistic effect of the throttling orifice plate and the high-speed fluid, combined with the tapered flow channel, can increase the flow velocity of the gas-liquid mixture to 5-6 m / s. The multi-stage shearing structure is used to perform stepwise cavitation and breakup of the gas-liquid mixture to initially refine the bubble particle size from micrometers to 200-300 nm and increase the bubble nucleation density. A gas replenishment and throttling unit (4) is connected to the outlet end of the premixing preparation unit (3), and its gas replenishment port is connected to the carbon dioxide treatment unit (2). This unit is used to receive the primary nanobubbles output by the premixing preparation unit (3) and replenish gaseous CO2 through the gas replenishment chamber to increase the nucleation density of the bubbles. The gas replenishment and throttling unit (4) includes a throttling valve group. When the gas-liquid mixture enters the throttling valve group, a strong cavitation effect is generated under the high-pressure throttling action of 30-50MPa, which further shears and crushes the primary nanobubbles to form nanobubble finished products. The average particle size of the nanobubble finished products is ≤50nm and the concentration is ≥9.0×10⁻⁶. 9 per mL.

2. The industrial-grade ultra-high concentration nanobubble generation system according to claim 1, characterized in that, The premixing preparation unit (3) includes a reaction vessel with a high-pressure cavity structure inside. The multi-stage shearing structure includes a throttling orifice plate arranged along the flow direction of the mixing medium and a positioning plate for mounting the throttling orifice plate. The throttling orifice plate has a throttling hole through it along the axial direction. A tapered flow channel for the mixing medium to pass through is formed inside the throttling hole. The tapered flow channel is a three-section variable diameter flow channel structure and includes three sections with the inner diameter decreasing sequentially along the fluid flow direction. The inlet end of the tapered flow channel is located on the high-pressure side and at the lower end, and the outlet end is located on the low-pressure side and at the upper end. Two positioning holes are symmetrically arranged on the outside of the throttling orifice. The positioning holes are used to position and fix the throttling orifice plate. Multiple mounting positioning posts are evenly distributed around the outer edge of the positioning plate for fastening assembly with external pipelines or valve seats.

3. The industrial-grade ultra-high concentration nanobubble generation system according to claim 1, characterized in that, The carbon dioxide processing unit (2) includes: The carbon dioxide storage tank is a high-pressure container structure. The carbon dioxide storage tank is equipped with a gaseous output channel and a liquid output channel inside. The top and bottom of the carbon dioxide storage tank are respectively provided with gaseous carbon dioxide outlet and liquid carbon dioxide outlet. A primary pressurization module is provided, with its inlet connected to both the gaseous carbon dioxide outlet and the liquid carbon dioxide outlet, and its outlet connected to the inlet of a buffer tank. The primary pressurization module is used to pressurize the carbon dioxide output from the gaseous carbon dioxide outlet and the liquid carbon dioxide outlet and deliver it to the buffer tank. The buffer tank has an internal elastic pressure balancing structure and is used to buffer the pressure of the gas-liquid mixture of carbon dioxide after the first stage of pressurization. A secondary pressurization module, the inlet of which is connected to the outlet of the buffer tank, is used to perform secondary pressurization on the carbon dioxide output from the outlet of the buffer tank; The first heating module is used to regulate the temperature of the carbon dioxide after secondary pressurization.

4. The industrial-grade ultra-high concentration nanobubble generation system according to claim 1, characterized in that, The raw water treatment unit (1) comprises, in series: The water inlet module is connected to the industrial water supply pipeline via a water supply pipeline, and the water supply pipeline is equipped with a one-way check valve. The filter module is used to filter particulate impurities in the industrial water output from the inlet module. The second heating module is used to heat the filtered industrial water. The outlet end of the second heating module is equipped with a temperature detection device for real-time monitoring of the water temperature. The pressurization module is used to pressurize the heated water to a preset pressure.

5. The industrial-grade ultra-high concentration nanobubble generation system according to claim 2, characterized in that, The reaction vessel has a first inlet at the top and a second inlet and a bubble outlet on the side wall. The bubble outlet is located above the second inlet. The first inlet is connected to the carbon dioxide treatment unit (2). The carbon dioxide from the carbon dioxide treatment unit (2) is delivered to the reaction vessel through the first inlet. The second inlet is connected to the raw water treatment unit (1). The high-pressure water from the raw water treatment unit (1) is delivered to the reaction vessel through the second inlet. The bubble outlet is connected to the gas replenishment and throttling unit (4). The primary nanobubbles discharged from the bubble outlet enter the gas replenishment and throttling unit (4) through a pipe.

6. The industrial-grade ultra-high concentration nanobubble generation system according to claim 5, characterized in that, The gas replenishment and throttling unit (4) is a high-pressure container structure with a gas replenishment chamber inside. The top of the gas replenishment chamber is connected to the carbon dioxide treatment unit (2) through a pressure-holding pipeline (41). The carbon dioxide treatment unit (2) replenishes carbon dioxide to the gas replenishment chamber through the pressure-holding pipeline (41). A bubble delivery pipeline (42) is connected between the gas replenishment and throttling unit (4) and the bubble outlet to deliver primary nanobubbles to the gas replenishment and throttling unit (4). A low-speed stirring paddle is provided inside the gas replenishment chamber. The low-speed stirring paddle is used to stir the primary nanobubbles and the replenished carbon dioxide entering the gas replenishment chamber to form a high-concentration carbon dioxide nanobubble product. A throttling valve group is provided on the output pipeline of the gas replenishment and throttling unit (4).

7. A method for preparing industrial-grade ultra-high concentration nanobubbles, characterized in that, The preparation method, applied to the system according to any one of claims 1 to 6, comprises the steps of: S10: The industrial water is pretreated by filtration, heating and pressurization in the raw water treatment unit (1) and then high-pressure water is delivered to the premixing preparation unit (3); S20: Turn on the carbon dioxide processing unit (2) to perform secondary pressurization and heating treatment on the carbon dioxide so that the carbon dioxide is in a supercritical state and is transported to the premix preparation unit (3); S30: In the premixing preparation unit (3), high-pressure water and supercritical carbon dioxide are fully mixed by gas-liquid contact under the action of multi-level shear structure so that carbon dioxide forms primary nanobubbles in high-pressure water. S40: The primary nanobubbles are fed into the gas-filling throttling unit (4), and the nanobubbles are generated by stirring, shearing and crushing. Among them, the concentration of the finished nanobubble product is ≥9.0×10⁻⁶. 9 Particles / mL, average particle size ≤50nm.

8. The method for preparing industrial-grade ultra-high concentration nanobubbles according to claim 7, characterized in that, Step S20 includes: Open the gaseous carbon dioxide outlet and liquid carbon dioxide outlet of the carbon dioxide storage module, and maintain the gas-liquid output ratio of carbon dioxide by flow regulation, so that carbon dioxide is stably supplied to the premixed preparation unit (3). Carbon dioxide enters the first-stage pressurization module according to the preset gas-liquid output ratio. The first-stage pressurization module pressurizes the gas to the predetermined pressure and sends it into the buffer tank. The internal elastic pressure balancing structure reduces pressure fluctuations and stabilizes the gas pressure. After being pressurized and stabilized by the first-stage pressurization module, the carbon dioxide enters the second-stage pressurization module, where it is further pressurized to the high pressure required for nanobubble preparation. The carbon dioxide, after being pressurized in two stages, is sent to the first heating module and heated to a preset temperature so that the carbon dioxide is in a supercritical state.

9. The method for preparing industrial-grade ultra-high concentration nanobubbles according to claim 7, characterized in that, Step S30 includes: High-pressure water and supercritical carbon dioxide are introduced into the reaction vessel of the premixing preparation unit (3) respectively. Through multi-stage mixing and shearing structure, full gas-liquid contact is achieved, so that carbon dioxide forms primary nanobubbles in the water. At the same time, the gas volume fraction is kept within a predetermined range by flow rate regulation. After undergoing multiple shearing processes and fluid flow rate regulation, the primary nanobubble mixture gradually refines the bubbles, forming a nanobubble solution with uniform size and high concentration.

10. The method for preparing industrial-grade ultra-high concentration nanobubbles according to claim 7, characterized in that, Step S40 includes: Open the bubble outlet of the premix preparation unit (3) to deliver primary nanobubbles to the gas replenishment throttling unit (4) through the bubble delivery pipeline (42); While the carbon dioxide processing unit (2) supplies carbon dioxide to the premixing preparation unit (3), it also replenishes the gas replenishment chamber with carbon dioxide through the pressure-holding pipeline (41). Turn on the low-speed stirring paddle in the gas replenishment chamber to stir the primary nanobubbles and the replenished carbon dioxide in the gas replenishment chamber to form a high-concentration carbon dioxide nanobubble product.

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