A micro-nano bubble generating process

Abstract

The present application relates to a kind of micro-nano bubble generation processes, belong to bubble generation field, including the following steps: S1, make water flow have preset speed into beam cavity, and in beam cavity, flow in jet form, the beam that flows out from beam cavity and after mixing from air inlet cavity into gas, into flow guide cavity;S2, gas-liquid mixture from flow guide cavity into collision cavity, and in collision cavity, bubble micronization;S3, after impact and the gas-liquid mixture of forming turbulent flow, into rotating cavity, by rotating piece in rotating cavity, impact again, finally with high-speed rotating state shoots out rotating cavity, and high-speed rotating water flow and negative pressure cavity can continuously cut gas bubble, to further produce micro-nano bubble.The present application has the advantages that: water flow and gas are rotated and sheared in turn through beam cavity, flow guide cavity, collision cavity and rotating cavity, and the phenomenon of rotating and shearing breakage or mutual impact occurs, to realize the breakage of gas bubble several times.

Description

Technical Field

[0001] This invention relates to a micro / nano bubble generation process, belonging to the field of bubble generation. Background Technology

[0002] Micro- and nanobubbles refer to bubbles with diameters ranging from tens of micrometers to hundreds of nanometers during their formation. These bubbles fall between micrometer and nanobubbles, possessing physical and chemical properties not found in conventional bubbles. Micro- and nanobubbles are characterized by large specific surface area, slow rise velocity, self-pressurization and dissolution, surface charging, generation of numerous free radicals, and high gas solubility. They are widely used in wastewater treatment, environmental protection, and fruit and vegetable cleaning.

[0003] Currently, domestic and international methods for generating micro- and nano-bubbles include the water temperature difference method, the electric field method, the microwave method, and the Venturi jet method. These methods are used in conjunction with devices such as rotary shearing and centrifugation to prepare micro- and nano-bubbles. However, the Venturi jet method cannot produce bubbles with nanometer-sized particles, and the jet generator is mainly used in the plug flow aeration stage of wastewater treatment plants, limiting its application. The water temperature difference method cannot precisely control the water temperature difference, and the number of micro- and nano-bubbles produced is small. The electric field method has drawbacks such as low bubble quantity, electrode consumption, and high energy consumption, placing strict requirements on the electrolysis equipment in many practical applications.

[0004] Pressurized dissolved air micro-nano bubble generators have significant application potential due to their advantages such as "compact structure, high controllability, and small bubble production". However, traditional pressurized dissolved air aeration devices produce too few bubbles, and the generated micro-nano bubbles diffuse unevenly and insufficiently when applied to river and lake water bodies. At the same time, the pressurized dissolved air process requires a large pressure, resulting in high energy consumption. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a micro / nano bubble generation process. The technical solution of this invention is as follows:

[0006] A micro / nano bubble generation process includes the following steps:

[0007] S1. Water flows into the beam cavity and flows in a jet-like manner within the beam cavity. The beam flowing out of the beam cavity mixes with the gas entering from the air inlet cavity and then enters the guide cavity. The gas-liquid mixture impacts the inner wall of the guide cavity, forming a water sealing point to eliminate the gap between the water flow and the guide cavity, thereby improving the pressure resistance to the subsequent water flow.

[0008] S2. The gas-liquid mixture enters the collision chamber from the guide cavity and undergoes micro-nanoization of bubbles within the collision chamber. Multiple threaded columns are arranged within the collision chamber, with the end of each threaded column facing the gas-liquid mixture. The gas-liquid mixture passing through the threaded column is impacted. When the gas-liquid mixture with velocity impacts the threaded column, turbulence is formed in the gas-liquid mixture, resulting in micro-nanoization of bubbles.

[0009] S3. The gas-liquid mixture, after impact and turbulence, enters the rotating cavity and is impacted again by the rotating component inside. When the gas-liquid mixture acts on the rotating component, it pushes the component to rotate. Due to the spiral groove formed between the rotating component and the rotating cavity, the gas-liquid mixture passes through the spiral groove and the water passage on the rotating component, and then continues to flow in a spiral shape in the rotating cavity. Because the rotating cavity is funnel-shaped, the gas-liquid mixture increases in speed as the inner diameter of the rotation is continuously compressed during the spiral advance. Finally, it is ejected from the rotating cavity in a rotating state. The high-speed rotating water flow and the negative pressure cavity continuously cut the bubbles, thereby further generating micro-nano bubbles. The formation of the negative pressure cavity is mainly due to the difference in density between water and gas. During the rotation, the centrifugal forces on water and gas are different. During rotation, water is continuously compressed outward, and gas is continuously accumulated inward, thus forming a negative pressure shaft.

[0010] In step S3, the diameter of the outlet at the end of the rotating chamber and the diameter of the negative pressure shaft must satisfy the following relationship:

[0011] Let the volume of the rotating chamber be A, the length of the rotating chamber be L2, the required water output be Q, the gas inlet velocity be v3, and the diameter of the water outlet at the end of the rotating chamber be D2.

[0012] Then: D2<2x√[Q x v3 / (A x L2 xπ)](1);

[0013] The rotating gas-liquid mixture dispersed through the rotating cavity has a cone-shaped dispersion, which provides the contact area between gas and water for the micro- and nano-sized bubbles.

[0014] The depth L3 of the outlet hole at the end of the rotating chamber and the diameter D3 of the negative pressure shaft satisfy the following relationship:

[0015] L3 < 2x D3.

[0016] In step S3, in order to form a stable rotating water flow into the rotating cavity and provide a stable water flow for the formation of the negative pressure shaft in the rotating cavity, the rotating component needs to meet the following condition: L1>2*n1*D1(2); where D1 is the diameter of the water passage hole on the rotating component; L1 is the length of the helix; n1 is the number of water passage holes; where,

[0017] The length L1 of the helix is ​​calculated as follows:

[0018] L1=2πR+(2πrd√2 / 3)(n-1 / 2) (3);

[0019] Where R is the outer diameter of the helix; d is the pitch of the helix; r is the radius of curvature inside the helix; and n is the number of folds in the helix.

[0020] Therefore, based on formula (2), we can conclude that:

[0021] 2πR+(2πrd√2 / 3)(n-1 / 2)>2*n1*D1 (4);

[0022] D1<(2πR+(2πrd√2 / 3)(n-1 / 2)) / (2*n1) (5);

[0023] In step S1, the beam cavity is arranged in a funnel shape with an outward flare, and the water outlet of the beam cavity is adjacent to the water inlet of the guide cavity. After the gas-liquid mixture is ejected from the beam cavity, it enters the guide cavity and undergoes one refraction in the guide cavity. The point of refraction is the sealing point of the water flow, forming a water seal.

[0024] In step S1, the beam cavity is narrowed inward and the water outlet of the beam cavity is adjacent to the water inlet of the guide cavity. After the gas-liquid mixture is ejected from the beam cavity, it enters the guide cavity and undergoes one refraction in the guide cavity. The point of refraction is the sealing point of the water flow, forming a water seal.

[0025] In step S2, the threaded column is divided into two groups: a front threaded unit and a rear threaded unit, with a gap between them. After the gas-liquid mixture enters the front threaded unit, it directly impacts the threaded column, creating turbulence and collision effects to achieve micro-nanoization of the bubbles. The mixed water flows through the side holes distributed around the front threaded unit into the rear threaded unit, where it impacts the threaded column again. The water, after impact and turbulence, enters the rotating cavity through the central hole of the rear threaded unit.

[0026] The advantages of this invention are: water and gas sequentially pass through the flow chamber, the guide chamber, the collision chamber, and the rotating chamber, undergoing rotational shearing, resulting in spin-cutting and breakage or mutual collisions, thus achieving multiple breakages of the bubbles. This results in a greater number of micro- and nano-bubbles with more uniform particle size, while reducing the pressure and energy consumption required for gas-liquid mixing, i.e., pressurized gas dissolution. It also improves the efficiency of bubble preparation, broadens the application range, and plays an important role in energy conservation, environmental protection, and efficiency improvement.

[0027] It has the following advantages:

[0028] (1) Less prone to clogging, eliminating the need for small-diameter, high-pressure processes commonly found in the market, thus reducing clogging. (2) Low power consumption, eliminating the influence of gas-liquid mixing pumps, directly using pipeline booster pumps or frequency converter pumps. Compared to equipment on the market, the advantages are as follows:

[0029] (2-1) Reduced equipment manufacturing costs. The purchase cost of a gas-liquid mixing pump of the same specifications is higher than that of adding a pump or a variable frequency pump.

[0030] (2-2) Low operating costs in the later stages. The purchase power of a gas-liquid mixing pump of the same specifications is higher than that of an additional pump or a variable frequency pump.

[0031] Flow rates can be superimposed. By eliminating the limitations of gas-liquid mixing pumps, flow rate limitations are eliminated. Flow rates can be superimposed according to basic specifications, thus achieving the production of high-flow-rate micro-nano hydrogen-rich water. (2-3) Low noise. Gas-liquid mixing pumps emit a loud and harsh noise when operating, but using pipeline booster pumps or frequency converters results in very low noise, especially frequency converters, which can basically operate at a low noise level.

[0032] (2-4) Improve the service life of the water pump. The gas-liquid mixing pumps used on the market use air in the pump inlet. The air bubbles present in the pump can cause cavitation on the pump blades, which reduces the service life of the water pump. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the apparatus for implementing the process of the present invention.

[0034] Figure 2 yes Figure 1 A schematic diagram showing the connection between the mid-beam cavity and the guide cavity.

[0035] Figure 3 yes Figure 2 A schematic diagram illustrating the working principle of the mid-beam cavity and the guide cavity.

[0036] Figure 4 A schematic diagram of the negative pressure shaft of the present invention.

[0037] Figure 5 This is a diameter distribution diagram of the air bubble particles in the hydrogen-rich water produced by the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Beam cavity; 2. Inlet cavity; 3. Guide cavity; 4. Collision cavity; 5. Front threaded assembly unit; 6. Rear threaded assembly unit; 7. Rotating cavity; 8. Rotating component; 9. Negative pressure shaft. Detailed Implementation

[0040] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0041] See Figures 1 to 4 This invention relates to a micro / nano bubble generation process, comprising the following steps:

[0042] S1. Water is pumped into the beam cavity 1 and flows in a jet-like manner within the beam cavity 1. The beam flowing out of the beam cavity 1 mixes with the gas entering from the air inlet cavity 2 and then enters the guide cavity 3. The gas-liquid mixture impacts the inner wall of the guide cavity 3, forming a water sealing point to eliminate the gap between the water flow and the guide cavity 3, thereby improving the pressure resistance to the subsequent water flow. The pressure of the gas-liquid mixture is between 0.6-0.8 MPa, and the gas-water ratio of the gas-liquid mixture is 1:10.

[0043] S2. The gas-liquid mixture enters the collision chamber 4 from the guide chamber 3 and undergoes micro-nanoization of bubbles in the collision chamber 4. Multiple threaded columns are arranged in the collision chamber 4, with the end of each threaded column facing the gas-liquid mixture. The gas-liquid mixture passing through the threaded column is impacted. When the gas-liquid mixture with velocity impacts the threaded column, turbulence of the gas-liquid mixture is formed, and micro-nanoization of bubbles is achieved.

[0044] S3. The gas-liquid mixture, after impact and turbulence, enters the rotating cavity 7 and is impacted again by the rotating component 8 inside the rotating cavity 7. When the gas-liquid mixture acts on the rotating component 8, it pushes the rotating component 8 to rotate. Since a spiral groove is formed between the rotating component 8 and the rotating cavity, the gas-liquid mixture passes through the spiral groove and the water passage on the rotating component 8, and then continues to flow in a spiral shape in the rotating cavity 7. Since the rotating cavity 7 is funnel-shaped, the gas-liquid mixture increases in speed as the inner diameter of the rotation is continuously compressed during the spiral advance, and finally exits the rotating cavity 7 in a rotating state. The high-speed rotating water flow and the negative pressure cavity will continuously cut the bubbles, thereby further generating micro-nano bubbles. The formation of the negative pressure cavity is mainly due to the difference in density between water and gas. During the rotation, the centrifugal force experienced by water and gas is different. During rotation, water will continuously compress outward and gas will continuously accumulate inward, thus forming the negative pressure shaft 9.

[0045] The device for generating the process of the present invention includes a beam cavity 1, a guide cavity 3, a collision cavity 4 and a rotating cavity 7 arranged sequentially in the housing. A rotating component 8 is rotatably installed in the rotating cavity 7. An air inlet cavity 2 (conical in shape) is arranged in the area between the beam cavity 1 and the guide cavity 3. At least two sets of threaded units are arranged in the collision cavity 4 to collide the gas-liquid mixture.

[0046] In step S3, the diameter of the outlet at the end of the rotating cavity 7 and the diameter of the negative pressure shaft 9 need to satisfy the following relationship: L3 < 2xD2.

[0047] Let the volume of the rotating chamber 7 be A, the length of the rotating chamber 7 be L2, the required water output be Q, the gas inlet velocity be v3, and the diameter of the water outlet at the end of the rotating chamber be D2.

[0048] Then: D2<2x√[Qxv3 / (AxL2xπ)](1);

[0049] The rotating gas-liquid mixture dispersed through the rotating cavity 7 has a cone-shaped dispersion, which provides the contact area between gas and water for the micro- and nano-sized bubbles.

[0050] In step S3, in order to form a stable rotating water flow into the rotating cavity 7 and provide a stable water flow for the formation of the negative pressure shaft 9 in the rotating cavity 7, the rotating component 8 needs to meet the following condition: L1>2*n1*D1(2); where D1 is the diameter of the water passage hole on the rotating component 8; L1 is the length of the helix; n1 is the number of water passage holes; and the calculation method for the length of the helix L1 is as follows:

[0051] L1=2π R+(2πrd√2 / 3)(n-1 / 2) (3);

[0052] Where R is the outer diameter of the helix; d is the pitch of the helix; r is the radius of curvature inside the helix; and n is the number of folds in the helix.

[0053] Therefore, based on formula (2), we can conclude that:

[0054] 2πR+(2πrd√2 / 3)(n-1 / 2)>2*n1*D1 (4);

[0055] D1<(2 π R+(2πrd√2 / 3)(n-1 / 2)) / (2*n1) (5);

[0056] The beam cavity 1 is generally arranged in the shape of a flared funnel, and the water outlet of the beam cavity 1 is adjacent to the water inlet of the guide cavity 3. After the gas-liquid mixture is ejected from the beam cavity 1, it enters the guide cavity 3 and is refracted once in the guide cavity 3. The point of refraction is the sealing point of the water flow, forming a water seal.

[0057] In step S1, the beam cavity 1 is narrowed inwards and its outlet end is adjacent to the inlet end of the guide cavity 3. After the gas-liquid mixture exits the beam cavity 1, it enters the guide cavity 3, changing the straight-through characteristic of the beam cavity 1 to an outward expansion angle of α, forming a trumpet shape. After exiting the beam cavity 1, the water flow enters the guide cavity 3 and undergoes one refraction within the guide cavity 3. The point of refraction is the sealing point b of the water flow. This water sealing point can eliminate the gap between the water flow and the guide cavity 3, improving the pressure resistance of the downstream water.

[0058] The flare angle α of the flow cavity 1 needs to be within the range of 0-90°, and the size of this angle is related to the flow velocity of the water. The formation of the flow cavity 1 into a funnel-shaped water flow is not limited to a single angle change, but can be achieved through multiple step angle changes to address the issue of large angles not being formed in one step.

[0059] Water passing through the beam cavity 1 forms a funnel-shaped feature. This is not limited to the α-angle design within the beam cavity 1. Alternatively, a feature can be added in the middle of the water flow so that the water flow impacts the feature, guiding the water flow to form a funnel-shaped feature.

[0060] The water passing through the flow chamber 1 forms a funnel-shaped feature, which is not limited to expanding outwards, but can also contract inwards. After the water flow contracts, it is injected into the flow guide chamber 3. Due to the surface tension of the water, after contracting to a point, there will be an outward expansion phenomenon. Therefore, the expanded water collides with the inner wall of the flow guide chamber 3, which will also form a liquid sealing point, so the effect can also be achieved.

[0061] It is not limited to the number and combination of the beam cavity 1 and the guide cavity 3 (the diameter of the beam cavity 1 is larger than the diameter of the guide cavity 3, the diameter of the beam cavity 1 is smaller than the diameter of the guide cavity 3, or the beam cavity 1 and the guide cavity 3 are misaligned); at the same time, it is not limited to the air intake method and the number of air intake holes.

[0062] By relying on the high-speed flow of water, it collides and refracts with the inner wall of the guide cavity 3, forming a water sealing point and completing the performance improvement.

[0063] In step S2, the threaded column is divided into two groups: a front threaded unit 5 and a rear threaded unit 6, with a gap between them. After the gas-liquid mixture enters the front threaded unit 5, it directly impacts the threaded column, creating turbulence and collision effects to achieve micro-nanoization of the bubbles. The mixed water flows through the side holes distributed around the front threaded unit and enters the rear threaded unit 6, where it impacts the threaded column again. The water, after impact and turbulence, enters the rotating cavity 7 through the central hole of the rear threaded unit 6.

[0064] Of course, the threaded column of this invention can also be replaced by a conical ring structure. The bearing method is not limited to columnar, but can also be square or other irregular shapes to achieve mutual collision of air bubbles in the water flow, increase the collision effect. The smaller or sharper the setting, the faster the water flow speed, the smaller the diameter of the generated air bubbles, and the better the micro-nanoization of the air bubbles.

[0065] Of course, threaded columns are not limited to cylindrical shapes; they can also be mesh-like or other cut structures. Similarly, water flow impact methods are not limited to direct impact on the collision feature; scattering can also be achieved by reducing the size of the upper pores and the wall thickness.

[0066] like Figure 5 As shown, the diameter distribution of air bubbles in the hydrogen-rich water produced using the process of this invention is illustrated. Figure 5 As can be seen, the results of the three tests are quite consistent, which means that the generated micro-nano bubbles have good stability, and the diameter of most of the tested bubbles is below 130nm.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A micro / nano bubble generation process, characterized in that, Includes the following steps: S1. Water flows into the beam cavity and flows in a jet-like manner within the beam cavity. The beam flowing out of the beam cavity mixes with the gas entering from the air inlet cavity and then enters the guide cavity. The gas-liquid mixture impacts the inner wall of the guide cavity, forming a water sealing point to eliminate the gap between the water flow and the guide cavity, thereby improving the pressure resistance to the subsequent water flow. S2. The gas-liquid mixture enters the collision chamber from the guide cavity and undergoes micro-nanoization of bubbles within the collision chamber. Multiple threaded columns are arranged within the collision chamber, with the end of each threaded column facing the gas-liquid mixture. The gas-liquid mixture passing through the threaded column is impacted. When the gas-liquid mixture with velocity impacts the threaded column, turbulence is formed in the gas-liquid mixture, resulting in micro-nanoization of bubbles. S3. The gas-liquid mixture, after impact and turbulence, enters the rotating cavity and is impacted again by the rotating component inside. When the gas-liquid mixture acts on the rotating component, it pushes the component to rotate. Due to the spiral groove formed between the rotating component and the rotating cavity, the gas-liquid mixture passes through the spiral groove and the water passage on the rotating component, and then continues to flow in a spiral shape inside the rotating cavity. Because the rotating cavity is funnel-shaped, the gas-liquid mixture increases in speed as the inner diameter of the rotating cavity is continuously compressed during the spiral advance, and finally exits the rotating cavity in a rotating state. The high-speed rotating water flow and the negative pressure cavity continuously cut the bubbles, thereby further generating micro-nano bubbles. The formation of the negative pressure cavity is mainly due to the difference in density between water and gas. During the rotation, the centrifugal forces experienced by water and gas are different. During rotation, water is continuously compressed outward, and gas is continuously accumulated inward, thus forming a negative pressure shaft. In step S3, the diameter of the outlet at the end of the rotating chamber and the diameter of the negative pressure shaft must satisfy the following relationship: Let the volume of the rotating chamber be A, the length of the rotating chamber be L2, the required water output be Q, the gas inlet velocity be v3, and the diameter of the water outlet at the end of the rotating chamber be D2. Then: D2 < 2x√[Q x v3 / (AxL2xπ)] (1; The rotating gas-liquid mixture dispersed through the rotating cavity has a cone-shaped dispersion, which provides the contact area between gas and water for the micro- and nano-sized bubbles. The depth L3 of the outlet hole at the end of the rotating chamber and the diameter D3 of the negative pressure shaft satisfy the following relationship: L3 < 2 x D3; In step S3, in order to form a stable rotating water flow into the rotating cavity and provide a stable water flow for the formation of the negative pressure shaft in the rotating cavity, the rotating component needs to meet the following condition: L1>2*n1*D1 (2); where D1 is the diameter of the water passage hole on the rotating component; L1 is the length of the helix; n1 is the number of water passage holes; where, The length L1 of the helix is ​​calculated as follows: L1=2πR+(2πrd√2 / 3)(n-1 / 2) (3); Where R is the outer diameter of the helix; d is the pitch of the helix; r is the radius of curvature inside the helix; and n is the number of folds in the helix. Therefore, based on formula (2), we can conclude that: 2πR+(2πrd√2 / 3)(n-1 / 2)>2*n1*D1 (4); D1<(2πR+(2πrd√2 / 3)(n-1 / 2)) / (2*n1) (5).

2. The micro / nano bubble generation process according to claim 1, characterized in that, In step S1, the beam cavity is arranged in the shape of an outwardly flared funnel, and the water outlet of the beam cavity is adjacent to the water inlet of the guide cavity. After the gas-liquid mixture is ejected from the beam cavity, it enters the guide cavity and undergoes one refraction in the guide cavity. The point of refraction is the sealing point of the water flow, forming a water seal.

3. The micro / nano bubble generation process according to claim 1, characterized in that, In step S1, the beam cavity is narrowed inward and the water outlet of the beam cavity is adjacent to the water inlet of the guide cavity. After the gas-liquid mixture is ejected from the beam cavity, it enters the guide cavity and undergoes one refraction in the guide cavity. The point of refraction is the sealing point of the water flow, forming a water seal.

4. The micro / nano bubble generation process according to claim 1, characterized in that, In step S2, the threaded column is divided into two groups: a front threaded unit and a rear threaded unit, with a gap between them. After the gas-liquid mixture enters the front threaded unit, it directly impacts the threaded column, creating turbulence and collision effects to achieve micro-nanoization of the bubbles. The mixed water flows through the side holes distributed around the front threaded unit into the rear threaded unit, where it impacts the threaded column again. The water, after impact and turbulence, enters the rotating cavity through the central hole of the rear threaded unit.

Images