CN109157993B - Micro-nano bubble generator and generation method - Google Patents

Micro-nano bubble generator and generation method Download PDF

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Publication number
CN109157993B
CN109157993B CN201810972839.XA CN201810972839A CN109157993B CN 109157993 B CN109157993 B CN 109157993B CN 201810972839 A CN201810972839 A CN 201810972839A CN 109157993 B CN109157993 B CN 109157993B
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main body
water
micro
nano bubble
bubble generator
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CN109157993A (en
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张秀芳
方渡飞
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Shanghai Zhanheng Environmental Protection Technology Co ltd
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Shanghai Jieshengyuan Tech Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/10Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/23Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2319Methods of introducing gases into liquid media
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/23Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2366Parts; Accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/23Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91Direction of flow or arrangement of feed and discharge openings
    • B01F2025/914Tangential flow, i.e. flow spiraling in a tangential direction in a flat plane or belt-like area

Abstract

The invention relates to a micro-nano bubble generator and a generating method thereof, wherein the micro-nano bubble generator comprises a main body and an end cover, the end cover is hermetically arranged at the top end of the main body, an air inlet is arranged on the end cover, the main body is provided with an inverted conical inner cavity, the side wall of the main body is provided with a water inlet, the bottom of the main body is provided with a water outlet, and the water inlet is tangential to the inner wall of the main body. When the air-water separator works, water flow is injected from the water inlet along the tangential direction of the inner wall of the main body by controlling pressure, rotational flow is formed in the inner cavity, air is introduced from the air inlet, and bubbles are generated after the air and the water flow are mixed and are discharged from the water outlet together with the water flow. According to the invention, the structure of the micro-nano bubble generator is improved, the opportunity and the strength of bubble/water mixing are improved by combining eccentricity and rotational flow, the volume percentage of bubbles/water is greatly improved, the volume ratio of bubbles/water can reach about 40%, and the micro-nano bubble generator has a good application prospect.

Description

Micro-nano bubble generator and generation method
Technical Field
The invention relates to the field of bubble generation, in particular to a micro-nano bubble generator and a generation method.
Background
In the sewage, dilute sludge treatment and aquaculture industry, ozone or oxygen-containing bubbles are usually fed into the water in order to effectively oxidize the water or enrich the water with oxygen. The diameter of the traditional bubble is about hundreds of microns to about 1 millimeter, and the bubble can only be remained in the water body with the depth of about 2 meters for less than 10 seconds under the action of buoyancy. Therefore, the efficiency of the process of oxygen enrichment by bubbles is very low, especially for the bubbles containing ozone in sewage treatment, because the efficiency of the ozone generation process is very low and the energy consumption is large, most of the ozone in the bubbles has no time to generate oxidation with the water body and the bubbles are broken out of the water surface to lose efficacy. In recent years, a great deal of research has shown that if the diameter of the generated bubbles is several micrometers, two directions of change tend to occur, one being that the bubbles are combined by collision and the diameter becomes large, and the other being that the bubble diameter becomes small due to surface tension. Thus, micro-nano bubbles are formed in a proper water body, and experiments show that the retention time of the micro-nano bubbles is greatly increased, wherein the bubbles with the diameter of about 100 nanometers can be retained in the water body for hours or even longer.
Currently, there are many devices and methods for generating micro-nano bubbles, for example, CN205868033U discloses a nano bubble generator, which includes a jet orifice, an axial flow fan, a circulating water system, a water pump, and a nano bubble system, wherein the jet orifice is installed above an upper reaction tank, a detection port is arranged on the right side of the upper reaction tank, a liquid column is arranged below the jet orifice, a vibration bubble splitter is arranged on the left side of the liquid column, the nano bubble system is installed below the upper reaction tank, and a partition plate is arranged below the upper reaction tank. CN107583480A discloses a microbubble generator and a manufacturing method thereof, the microbubble generator includes a pressure increasing pipe including a first water inlet and a first water outlet, and a sectional area of the first water outlet is smaller than a sectional area of the first water inlet; the bubble generating pipe is communicated with the first water outlet and comprises a second water inlet and a second water outlet, and the first water outlet is arranged in the second water inlet; the air inlet channel is arranged on the bubble generating pipe and is communicated with the outside air; and the cutting net is arranged at the second water outlet. CN2571736A discloses an improved bubble generator, which mainly comprises a shaft rod and a sleeve, wherein the diameter of the shaft rod is slightly smaller than the inner diameter of the sleeve, and two ends of the shaft rod are provided with protruding fixing parts, the center is provided with a surrounding arc-shaped groove, the shaft rod is sleeved on the sleeve, a connecting rod is connected to the fixing part and the opening edge of the sleeve, a proper gap is formed between the shaft rod and the sleeve, when water flows through the gap, the central groove of the shaft rod sinks to form instantaneous extrusion, so as to generate micro bubbles.
At present, micro-nano bubble generating devices circulating in the market are mostly designed based on the Venturi effect principle. This effect is manifested in the phenomenon that the flow rate of the fluid increases when the restricted flow passes through a reduced flow cross section, the flow rate being inversely proportional to the flow cross section. This effect is referred to as the creation of a low pressure in the vicinity of the high velocity flow, thereby creating an adsorption effect. When gas and liquid flow inside the venturi, at the narrowest point of the duct, the dynamic pressure (head of velocity) reaches a maximum, the static pressure (resting pressure) reaches a minimum, and the velocity of the gas (liquid) rises as the cross-sectional area of the flow decreases. The entire inrush current is subjected to the pipe reduction process at the same time, and the pressure is reduced at the same time. Thereby creating a pressure differential that is used to measure or provide an external suction to the fluid.
Although the venturi tube type micro-nano bubble generator has the characteristics of simple structure, self-absorption and the like, the bubble generation efficiency is low (two indexes for measuring the bubble generation efficiency are the number of bubbles at an outlet and the volume percentage of the bubbles to water), and the mixing volume ratio of the bubbles/water is about 10-20%. Too low a volume ratio of bubbles/water limits its further application and spread.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a micro-nano bubble generator and a generating method thereof, which greatly improve the bubble generating efficiency, enable the volume ratio of bubbles/water to reach about 40% and have good application prospects.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a micro-nano bubble generator which comprises a main body and an end cover, wherein the end cover is arranged at the top end of the main body in a sealing mode, an air inlet is formed in the end cover, the main body is provided with an inverted conical inner cavity, a water inlet is formed in the side wall of the main body, a water outlet is formed in the bottom of the main body, and the water inlet is tangent to the inner wall of the main body.
Preferably, the micro-nano bubble generator is provided with a first plane passing through the central axis of the main body, the first plane is parallel to the central axis of the water inlet, and the air inlet is positioned on one side of the first plane close to the water inlet.
Preferably, the end cover is provided with a groove for placing an O-shaped ring so as to seal the whole conical inner cavity.
Preferably, the water inlet is disposed at a side of the main body adjacent to the end cap.
Preferably, the air inlet is eccentrically arranged on the end cover to improve the volume mixing ratio of air bubbles/water at the water outlet. The ratio of the eccentric distance, i.e. the distance between the central axis of the air inlet and the central axis of the main body, and the maximum diameter of the inner cavity is 0.3-0.4, for example, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39 or 0.4, and the specific values therebetween are limited to space and for the sake of brevity, and the present invention is not exhaustive.
Preferably, the taper of the lumen is 15-30 °, such as 15 °, 18 °, 20 °, 23 °, 25 °, 28 °, or 30 °, and the specific values therebetween, are not exhaustive for reasons of space and brevity.
The dimensional parameters of the invention for the components of the device are defined as follows:
the height of the inner cavity is defined as L, and the diameter of the air inlet is defined as D1The maximum diameter of the inner cavity is D2The diameter of the water outlet is D3
Preferably, the above parameters satisfy the following relationship:
D3/D2=0.05–0.12,L/D2=1.5–2.5
preferably, the dimensions of the above parameters are as shown in Table 1 (unit: mm):
TABLE 1
D1 D2 D3 L
0.3–1.2 10–50 1.5–4.0 12-120
In a second aspect, the present invention provides a method for generating micro-nano bubbles, using the apparatus of the first aspect to generate micro-nano bubbles, the method comprising: and controlling the pressure to enable water flow to be injected from the water inlet along the tangential direction of the inner wall of the main body, forming rotational flow in the inner cavity, introducing gas from the gas inlet, mixing the gas and the water flow to generate bubbles, and discharging the bubbles and the water flow from the water outlet.
In the invention, after water flow is injected from the water inlet along the tangential direction of the inner wall of the main body, rotational flow is formed in the pipe, the rotating water flow forms a relatively small pressure area in the center of the conical inner cavity due to centrifugal action, and introduced gas is fully mixed and compressed with water in the area and is finally discharged from the water outlet at the lower end together with the water.
In addition, the position of the air inlet is not in the center of the end cover, but has certain eccentricity, so that the design can greatly improve the volume mixing ratio of air bubbles to water discharged from the water outlet.
Preferably, the pressure of the introduced water stream is 0.15-0.25MPa, and may be, for example, 0.15MPa, 0.16MPa, 0.17MPa, 0.18MPa, 0.19MPa, 0.20MPa, 0.21MPa, 0.22MPa, 0.23MPa, 0.24MPa or 0.25MPa, and the specific values therebetween are limited for space and for the sake of brevity and are not exhaustive.
Preferably, the gas is introduced in a self-absorption or pressurization manner, and when the gas is introduced in a pressurization manner, the pressure is 0.05-0.075MPa lower than the pressure of the introduced water flow.
Compared with the prior art, the invention at least has the following beneficial effects:
according to the invention, the structure of the micro-nano bubble generator is improved, and the opportunity and strength of bubble/water mixing are improved by combining eccentricity and rotational flow, so that the volume percentage of bubbles/water is greatly improved, and the volume ratio of bubbles/water can reach about 40%.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a micro-nano bubble generator provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of an external structure of a micro-nano bubble generator provided in embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional view of a micro-nano bubble generator provided in embodiment 1 of the present invention;
in the figure: 1-main body, 2-end cover, 3-air inlet, 4-water inlet, and 5-water outlet.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The invention provides a micro-nano bubble generator in a specific embodiment, which comprises a main body and an end cover, wherein the end cover is hermetically arranged at the top end of the main body, an air inlet is formed in the end cover, the main body is provided with an inverted conical inner cavity, the side wall of the main body is provided with a water inlet, the bottom of the main body is provided with a water outlet, and the water inlet is tangential to the inner wall of the main body.
Preferably, the micro-nano bubble generator is provided with a first plane passing through the central axis of the main body, the first plane is parallel to the central axis of the water inlet, and the air inlet is positioned on one side of the first plane close to the water inlet.
Preferably, the end cover is provided with a groove for placing an O-shaped ring.
Preferably, the water inlet is disposed at a side of the main body adjacent to the end cap.
Preferably, the air inlet is eccentrically arranged on the end cover.
Preferably, the ratio of the distance between the central axis of the air inlet and the central axis of the main body to the maximum diameter of the inner cavity is 0.3-0.4.
Preferably, the taper of the cavity is 15-30 °.
The invention also provides a method for generating micro-nano bubbles in a specific embodiment part, wherein the micro-nano bubble generator is used for generating the micro-nano bubbles, and the method comprises the following steps: and controlling the pressure to enable water flow to be injected from the water inlet along the tangential direction of the inner wall of the main body, forming rotational flow in the inner cavity, introducing gas from the gas inlet, mixing the gas and the water flow to generate bubbles, and discharging the bubbles and the water flow from the water outlet.
Preferably, the pressure of the introduced water flow is 0.15-0.25 MPa.
Preferably, the gas is introduced in a self-priming or pressurized manner.
Preferably, the pressure of the pressurized gas is lower than the pressure of the water flow by 0.05-0.075 MPa.
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
As shown in fig. 1, 2 and 3, the embodiment provides a micro-nano bubble generator, which includes a main body 1 and an end cover 2, wherein the end cover 2 is provided with a groove for placing an O-ring and is hermetically arranged at the top end of the main body 1, the end cover 2 is eccentrically provided with an air inlet 3, the main body 1 is provided with an inverted conical inner cavity, the side wall of the main body 1 is provided with a water inlet 4, the bottom of the main body is provided with a water outlet 5, and the water inlet 4 is tangential to the inner wall of the main body 1; the micro-nano bubble generator is provided with a first plane passing through the central axis of the main body 1, the first plane is parallel to the central axis of the water inlet 4, and the air inlet 3 is positioned on one side of the first plane close to the water inlet.
Further, the dimensions of the components in this embodiment are: the diameter of the air inlet is 1.2mm, the eccentric distance is 13.5mm, the diameter of the water inlet is 3mm, the diameter of the water outlet is 3.2mm, the height of the inner cavity of the main body is 51mm, the maximum diameter of the inner cavity is 40mm, and the taper of the inner cavity is 19.8 degrees.
Example 2
The embodiment provides a micro-nano bubble generation method, which is implemented by using the micro-nano bubble generator provided in embodiment 1 to prepare micro-nano bubbles, and the method comprises the following steps: the pressure is controlled to be 0.2MPa, so that water flow is injected from the water inlet 4 along the tangential direction of the inner wall of the main body 1 to form rotational flow in the inner cavity, meanwhile, gas is introduced from the gas inlet 3 at the pressure of 0.15MPa, and the gas and the water flow are fully mixed in the inner cavity to generate bubbles and are discharged from the water outlet 5 together with the water flow.
The volumetric mixing ratio of bubbles/water in the discharged liquid was determined to be about 39%.
Example 3
The embodiment provides a micro-nano bubble generation method, which is implemented by using the micro-nano bubble generator provided in embodiment 1 to prepare micro-nano bubbles, and the method comprises the following steps: the pressure is controlled to be 0.25MPa, so that water flow is injected from the water inlet 4 along the tangential direction of the inner wall of the main body 1, rotational flow is formed in the inner cavity, the air inlet 3 is opened, air is introduced in a self-absorption mode, and the air and the water flow are fully mixed in the inner cavity to generate bubbles and are discharged from the water outlet 5 together with the water flow.
The volume mixing ratio of bubbles/water in the discharged liquid was measured to be 38%.
Comparative example 1
Compared with the embodiment 1, the micro-nano bubble generator provided by the comparative example is completely the same as the embodiment 1 except that the gas inlet 3 is arranged at the center of the end cover 2 (namely, the eccentric distance is 0 mm).
The device provided by the comparative example is used for preparing the micro-nano bubbles, and the preparation method is completely the same as that of the embodiment 2.
The volume mixing ratio of bubbles/water in the discharged liquid was determined to be 29%.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (8)

1. A micro-nano bubble generator is characterized by comprising a main body and an end cover, wherein the end cover is arranged at the top end of the main body in a sealing manner, an air inlet is formed in the end cover, the main body is provided with an inverted conical inner cavity, a water inlet is formed in the side wall of the main body, a water outlet is formed in the bottom of the main body, and the water inlet is tangent to the inner wall of the main body; the micro-nano bubble generator is provided with a first plane passing through the central axis of the main body, the first plane is parallel to the central axis of the water inlet, and the air inlet is positioned on one side of the first plane close to the water inlet; the air inlet is eccentrically arranged on the end cover, and the ratio of the distance between the central axis of the air inlet and the central axis of the main body to the maximum diameter of the inner cavity is 0.3-0.4.
2. The micro-nano bubble generator according to claim 1, wherein the end cap is provided with a groove for placing an O-shaped ring.
3. The micro-nano bubble generator according to claim 1, wherein the water inlet is disposed on a side of the main body close to the end cap.
4. The micro-nano bubble generator of claim 1, wherein the taper of the inner cavity is 15-30 °.
5. A micro-nano bubble generation method is characterized in that a micro-nano bubble generator according to any one of claims 1 to 4 is used for generating micro-nano bubbles, and the method comprises the following steps: and controlling the pressure to enable water flow to be injected from the water inlet along the tangential direction of the inner wall of the main body, forming rotational flow in the inner cavity, introducing gas from the gas inlet, mixing the gas and the water flow to generate bubbles, and discharging the bubbles and the water flow from the water outlet.
6. The method according to claim 5, wherein the pressure of the introduced water stream is 0.15 to 0.25 MPa.
7. The method of claim 5, wherein the gas is introduced by self-priming or pressurization.
8. The method of claim 7, wherein the pressure of the pressurized gas is between 0.05 and 0.075MPa less than the pressure of the water stream.
CN201810972839.XA 2018-08-24 2018-08-24 Micro-nano bubble generator and generation method Active CN109157993B (en)

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CN110813567A (en) * 2019-06-06 2020-02-21 南京擅水科技有限公司 Nano bubble shower nozzle
CN113477111B (en) * 2021-07-27 2023-02-10 微纳气泡(浙江)智能科技有限公司 Gas dissolving device for pushing and pressurizing from inside to outside and using method
CN113716644A (en) * 2021-08-19 2021-11-30 浙江一龙环保科技有限公司 Bubble cutter and method for preparing nano bubbles

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CN1256642A (en) * 1997-12-30 2000-06-14 大成博文 Swirling fine-bubble generator
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CN105214531A (en) * 2015-09-11 2016-01-06 中国石油化工股份有限公司 Foam-making apparatus
CN106552522A (en) * 2016-11-28 2017-04-05 北京工商大学 Micro-nano bubble generator
KR101829732B1 (en) * 2017-04-04 2018-02-20 신창기 Nano micro bubble generator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1202145A (en) * 1995-11-13 1998-12-16 里贝亚工程公司 Device for adding oxygen to water
CN1256642A (en) * 1997-12-30 2000-06-14 大成博文 Swirling fine-bubble generator
CN202078862U (en) * 2011-05-11 2011-12-21 深圳市神州创宇低碳技术有限公司 Straight-line spiral-flow type high-efficiency ultramicro fine bubble generator
WO2014192896A1 (en) * 2013-05-29 2014-12-04 株式会社アースリンク Micronanobubble generation method, micronanobubble generator, and micronanobubble generation device
CN105214531A (en) * 2015-09-11 2016-01-06 中国石油化工股份有限公司 Foam-making apparatus
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KR101829732B1 (en) * 2017-04-04 2018-02-20 신창기 Nano micro bubble generator

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Effective date of registration: 20230307

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Address before: 201315 area B, 2 / F, building 4, 128 dieqiao Road, Kangqiao Town, Pudong New Area, Shanghai

Patentee before: SHANGHAI JIESHENGYUAN TECH CO.,LTD.