CN112691562B - Micro-nano-scale gas-liquid mixing preparation device and preparation method of micro-nano-scale bubbles - Google Patents
Micro-nano-scale gas-liquid mixing preparation device and preparation method of micro-nano-scale bubbles Download PDFInfo
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- CN112691562B CN112691562B CN202110039079.9A CN202110039079A CN112691562B CN 112691562 B CN112691562 B CN 112691562B CN 202110039079 A CN202110039079 A CN 202110039079A CN 112691562 B CN112691562 B CN 112691562B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/2319—Methods of introducing gases into liquid media
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
- B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
- B01F33/811—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
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Abstract
The invention relates to the technical field of micro-bubble generation, in particular to a micro-nano gas-liquid mixing preparation device and a micro-nano bubble preparation method. The device comprises an input cover body, an external cabin body, an output cover body and a bubble generating device. The bubble generating means includes an inner ceramic tube and an intermediate ceramic tube. The mixing chamber and the storage chamber are formed by the inner ceramic tube, the middle ceramic tube and the outer chamber body respectively. The liquid and the gas overflowing from the inner ceramic tube are fully mixed in the mixing chamber to generate a first gas-liquid mixture. And then the second gas-liquid mixture is obtained by cutting the intermediate ceramic tube. And finally, obtaining the micro-nano gas-liquid mixture which meets the flow demand and has uniform bubble particle size through flow regulation, wherein the energy of the bubbles in the obtained micro-nano gas-liquid mixture is more, the bursting strength is higher, the uniformity is better, and the applicable range is wider.
Description
Technical Field
The invention relates to the technical field of micro-bubble generation, in particular to a micro-nano gas-liquid mixing preparation device and a micro-nano bubble preparation method.
Background
The micro-nano bubble principle is to mix liquid and gas, produces micro-nano bubble through the expansion pipe after high pressure compression, and the rethread micro-nano bubble shower nozzle discharges. The micro bubbles are bubbles existing in the liquid and having a bubble diameter of 100 μm or less. Nanobubbles are bubbles that exist in a liquid and have a diameter of several hundreds of nanometers or less. The air bubbles between the two form micro-nano bubbles in a mixed state. The micro-nano bubble preparation device is equipment for generating the micro-nano bubbles. The micro-nano bubbles have physical and chemical characteristics which are not possessed by the conventional bubbles, and are widely applied to the industrial fields of sewage treatment, waste gas treatment, beauty treatment, aquaculture, cleaning, water-based cultivation and the like.
Through retrieval, a micro-nano bubble generating device is disclosed in chinese patent document CN 106964268A. The device comprises a water inlet pipeline, a water pump, a connecting pipeline, a pressure tank, a water outlet pipeline and a micro-nano spray head which are connected in sequence, wherein the water inlet pipeline is also provided with a water diversion tank, a ball valve and a check valve; the diversion tank comprises a first tank body, a first water inlet and a first water outlet, the first water inlet is formed in the upper portion of the first tank body, the first water outlet is formed in the bottom of the first tank body, the diversion tank is connected to the water inlet pipeline in series, the water inlet pipeline is divided into a first pipeline and a second pipeline, the first pipeline is communicated with the first water inlet, the second pipeline is communicated with the first water outlet, an air guide pipe is further arranged in the first tank body, the two ends of the air guide pipe are respectively communicated with the first water inlet and the first water outlet, and the upper portion of the air guide pipe is further provided with an air guide through hole communicated with the inner portion of the first tank body.
However, in the actual use process, the micro-nano bubble generating device and the like are not good enough in structural design, the number of generated micro-nano bubbles is small, and the requirements of various industries on high bubble content are difficult to meet. Meanwhile, the micro-nano bubble generating device is difficult to accurately control the flow of liquid and the particle size of bubbles, and further influences the micro-nano bubbles to exert physical and chemical properties.
For another example, chinese patent document CN109876684A discloses a laboratory nanobubble generator with controllable particle size. The device comprises a main body bubble generator membrane assembly system, an air inlet system, a vacuum air exhaust system and a circulating water inlet system; in the main body bubble generator membrane module, a ceramic membrane filter core is fixed inside a membrane shell through an axial sealing ring to form an inner cavity and an outer cavity, openings on two sides of the upper part of the membrane module shell are connected with an air inlet system, and a nano microporous ceramic membrane is arranged on the ceramic membrane filter core. The device utilizes the nano-porous ceramic material as a membrane separator, has controllable pore size distribution, is convenient to replace, is beneficial to researching the generation mechanism of nano-bubbles under laboratory conditions and meets different experimental requirements. For example, the generated flow rate, the different gas types and the nano bubbles with uniform particle size form nano bubbles with a certain concentration. However, the device is mostly applied to the use environment of a laboratory, and under the complex working conditions of actual use, the output stability of the nano-scale bubbles generated by the device is difficult to ensure.
For another example, chinese patent document CN106310986B discloses a circulating micro-bubble type gas-liquid mixing device. The device comprises a gas-liquid mixing container, a plunger type metering pump, a pressure sensor, a system pressure relief opening, a valve and a pipeline, wherein a gas inlet of the gas-liquid mixing container is connected with a pressurization opening of the plunger type metering pump, a gas outlet of the gas-liquid mixing container is divided into two branches through the pipeline, one branch is connected with a gas charging opening of the plunger type metering pump, the other branch is connected with the system pressure relief opening, and the two branches are respectively controlled by the valve. The gas-liquid mixing container comprises a pressure container, a micro bubble generating device and a hydrophilic porous medium plate, wherein a water outlet and a gas inlet are arranged at the lower part of the pressure container, and a gas outlet is arranged at the upper part of the pressure container. The device is suitable for the gas-liquid mixing field with small dosage and high precision requirement under various temperature and pressure conditions, but is difficult to meet the use working conditions of high flow and higher uniformity of bubble particle size.
In summary, in the process of preparing micro-nano bubbles, how to design a gas-liquid mixing device to improve the output flow and uniformity of micro-nano bubbles formed by the existing micro-nano bubble preparation equipment, and to improve the content of nano bubbles at the same time, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a micro-nano gas-liquid mixing preparation device in the micro-nano bubble preparation process, which is used for improving the output flow and uniformity of micro-nano bubbles formed by the existing micro-nano bubble preparation equipment, improving the content of the nano bubbles, reducing the structural complexity and being suitable for more working conditions.
In order to achieve the purpose, the invention adopts the following scheme: the micro-nano gas-liquid mixing preparation device comprises an input cover body, an external cabin body, an output cover body and a bubble generation device, wherein the bubble generation device comprises an internal ceramic tube and a middle ceramic tube;
the input cover body is fixedly arranged at the head end of the outer cabin body, the output cover body is connected to the tail end of the outer cabin body and rotates relative to the outer cabin body, the middle ceramic pipe is arranged inside the outer cabin body, a storage cavity is formed between the outer wall of the middle ceramic pipe and the inner wall of the outer cabin body, the inner ceramic pipe is arranged inside the middle ceramic pipe, and a mixing cavity is formed between the inner wall of the middle ceramic pipe and the outer wall of the inner ceramic pipe;
the input cover body is provided with an input port and an air inlet, the input port is used for liquid to enter, the air inlet is used for gas to enter, the end face of the tail end of the input cover body is provided with a mounting hole, the head end of the middle ceramic tube is fixedly mounted in the mounting hole, and a first sealing structure is arranged between the middle ceramic tube and the input cover body;
the head end of the internal ceramic tube is connected with the air inlet through an air tube, and a second sealing structure is arranged between the internal ceramic tube and the air tube;
the end face of the tail end of the outer cabin body is provided with a first flow hole, a ceramic tube fixing seat is arranged inside the outer cabin body, the tail end of the middle ceramic tube and the tail end of the inner ceramic tube are both fixedly arranged on the ceramic tube fixing seat, and the ceramic tube fixing seat is provided with a third sealing structure for respectively sealing the tail end of the middle ceramic tube and the tail end of the inner ceramic tube;
the end face of the head end of the output cover body is provided with a second flow hole, the size of the overlapping area of the first flow hole and the second flow hole changes along with the rotation of the output cover body, and the output cover body is provided with an output port for discharging micro-nano gas-liquid mixture.
Preferably, the end face of the tail end of the input cover body is provided with a plurality of mounting holes, each mounting hole is internally provided with a bubble generating device, and the head end of each internal ceramic pipe is connected with the air inlet through an air pipe. So set up, be convenient for install a plurality of bubble generating device in external cabin, be favorable to when the flow of increase input liquid and gas and their pressure, can also guarantee the content of nanometer bubble in the micro-nanometer gas-liquid mixture.
Preferably, the end face of the tail end of the input cover body is provided with 3 mounting holes, and the 3 mounting holes are arranged on the end face of the tail end of the input cover body in an equilateral triangle shape. So set up, be favorable to further improving the speed that nanometer bubble produced, equilateral triangle's arrangement structure is favorable to reducing the mutual interference between 3 groups of bubble generating devices, further guarantees the homogeneity of bubble.
As the preferred, input lid and outside cabin body are connected through last fixed clamp, the installation and the dismantlement of the input lid of being convenient for, are provided with the sealed pad of input annular between input lid and the outside cabin body, through adjusting the elasticity of fixed clamp, are favorable to the sealed pad of input annular to form better sealed effect to the cavity between the input lid and the outside cabin body. Output lid and outside cabin body are connected through fixed clamp down, be provided with the sealed pad of output annular between the output lid and the outside cabin body, the installation and the dismantlement of the output lid of being convenient for on the one hand, make the sealed pad of output annular form better sealed effect simultaneously, on the other hand when adjusting the fixed clamp down, be convenient for adjust the turned angle of output lid for the outside cabin body, thereby adjust the coincidence area in first flow orifice and second flow orifice, and then be convenient for realize the regulation to delivery outlet discharge liquid flow size.
Preferably, the first sealing structure is an intermediate ceramic tube sealing ring, and the intermediate ceramic tube sealing ring is used for preventing liquid from leaking from the head end of the intermediate ceramic tube, so that the liquid is prevented from directly entering the storage chamber along the outer wall of the intermediate ceramic tube, and sufficient contact and mixing of the liquid and gas are facilitated. The second sealing structure is an internal ceramic tube sealing ring which is used for preventing gas from leaking from the head end of the internal ceramic tube, and the utilization rate of the gas is improved. The third sealing structure is a double-layer sealing ring, the inner layer of the double-layer sealing ring is used for preventing gas from leaking from the tail end of the inner ceramic tube, and the outer layer of the double-layer sealing ring is used for preventing liquid from leaking from the tail end of the middle ceramic tube. So set up, be convenient for maintain the pressure of liquid and gas in the equipment, be favorable to further promoting the production rate of micro-nano bubble.
Preferably, the side walls of the middle ceramic tube and the inner ceramic tube are both provided with nano ceramic films, and each nano ceramic film is composed of a plurality of layers of densely arranged nano micropores. So set up, through the nanometer ceramic membrane of selecting to have not unidimensional nanometer micropore, and then be favorable to realizing the control and the screening to the diameter of the bubble that produces, further improved the homogeneity of bubble in the micro-nano level gas-liquid mixture.
Preferably, the inner wall of the middle ceramic tube is provided with a first nano ceramic film, the inner wall of the inner ceramic tube is provided with a second nano ceramic film, the aperture of the nano micropore of the first nano ceramic film is 2nm-50nm, and the aperture of the nano micropore of the second nano ceramic film is 2nm-10 nm. The pore sizes of the nanometer micropores of the first nanometer ceramic membrane and the nanometer micropores of the second nanometer ceramic membrane are beneficial to screening the nanometer bubbles in the micro-nanometer gas-liquid mixture, and the content of the nanometer bubbles in the micro-nanometer gas-liquid mixture is further improved.
Preferably, the plurality of first flow holes are arranged in an annular array on the end face of the tail end of the outer cabin body, the plurality of second flow holes are arranged in the same annular array on the output cover body, the aperture of each second flow hole is equal to that of each first flow hole, the superposition area of the first flow holes and the second flow holes is convenient to calculate, and accurate adjustment of flow is facilitated.
When the micro-nano-scale gas-liquid mixing preparation device provided by the invention is used for preparing a gas-liquid mixture, liquid enters the mixing cavity from the input port of the output cover body through the head end of the middle ceramic tube. The gas passes through the gas pipe from the gas inlet, enters the inner ceramic pipe, and then enters the mixing chamber through the nanometer micropores on the inner ceramic pipe. The gas and the liquid are mixed in the mixing chamber to form a first gas-liquid mixture. And the first gas-liquid mixture is divided by the middle ceramic tube to obtain a second gas-liquid mixture. The second gas-liquid mixture is stored in the storage chamber. And the second gas-liquid mixture is discharged from the bottom of the outer cabin body through the flow regulation of the first flow holes and the second flow holes and the output port to obtain the micro-nano gas-liquid mixture which meets the flow demand and has uniform bubble particle size.
The invention also provides a method for preparing the micro-nano bubbles by using the micro-nano gas-liquid mixing preparation device, which comprises the following steps:
step one, introducing liquid into an input port of an input cover body, and introducing gas into an air inlet of the input cover body;
adjusting the pressure value of the gas to a first pressure value, and then adjusting the pressure value of the liquid to a second pressure value;
and step three, adjusting the size of the overlapping area of the first flow hole and the second flow hole, adjusting the flow rate to a first flow rate value, and discharging mixed liquid containing micro-scale bubbles and nano-scale bubbles.
Preferably, the method for preparing micro-nano bubbles further comprises: and step four, continuously circulating the output liquid obtained in the step three in the device for a period of time and then discharging the output liquid.
Preferably, the method for preparing micro-nano bubbles further comprises: and step five, standing the liquid discharged in the step four to be in a transparent state.
Preferably, the first pressure value in the second step is 0.5MPa to 0.8MPa, and the second pressure value is 0.5MPa to 0.8 MPa;
the first flow value in the third step is 5L/min-15L/min;
the circulation time of the liquid in the fourth step is 15-25 min;
and the standing time of the discharged liquid in the fifth step is 5-15 min.
Compared with the prior art, the micro-nano gas-liquid mixing preparation device and the preparation method of the micro-nano bubbles have the following prominent substantive characteristics and remarkable progress:
1. the micro-nano-scale gas-liquid mixing preparation device is designed by analyzing the physical characteristics of gas and liquid and controlling the porosity of the ceramic substrate by utilizing the loosening and the compaction degree of the ceramic tube, and the quality of an output gas-liquid mixture is improved by adjusting the pressure flow of input gas and liquid, the compaction degree of the ceramic tube and the contact ratio of the annular array holes of an output port;
2. the micro-nano-scale gas-liquid mixing preparation device realizes the mixing effect by adopting the pressure of input liquid and input gas, does not need external energy supply and improves the environmental protection degree;
3. the micro-nano-scale gas-liquid mixing preparation device is internally provided with a mixing chamber and a storage chamber, liquid and gas overflowing from an internal ceramic tube are fully mixed in the mixing chamber to generate a first gas-liquid mixture, the first gas-liquid mixture contains a large amount of micro-scale bubbles and nano-scale bubbles, and then is divided by an intermediate ceramic tube to obtain a second gas-liquid mixture, the content of the nano-scale bubbles in the second gas-liquid mixture is greatly improved, and finally, a micro-nano-scale gas-liquid mixture which meets the flow demand and is uniform in bubble particle size is obtained through flow regulation;
4. this micro-nano-scale gas-liquid mixture preparation facilities simple structure, the installation and debugging is convenient, can insert all kinds of pipelines, and to environmental suitability strong adaptability, it is swift convenient to wash the change accessory, can install multiunit bubble generating device according to the in-service use condition in external cabin body and use, has improved micro-nano-scale bubble's preparation speed greatly.
Drawings
FIG. 1 is a schematic perspective view of a micro-nano-scale gas-liquid mixing preparation apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of the retainer clip of FIG. 1;
FIG. 3 is a schematic perspective view of a micro-nano-scale gas-liquid mixing preparation device equipped with three sets of bubble generation devices;
FIG. 4 is a schematic top view of FIG. 3;
fig. 5 is an assembled view of fig. 1.
Reference numerals: the device comprises an upper fixing hoop 1, an input cover body 2, an input annular sealing gasket 3, an intermediate ceramic pipe sealing ring 4, an internal ceramic pipe sealing ring 5, an internal ceramic pipe 6, an intermediate ceramic pipe 7, an external cabin body 8, an output annular sealing gasket 9, a ceramic pipe fixing seat 10, an output cover body 11, a lower fixing hoop 12, a fastening screw 13, a connecting piece 14, an intermediate fixing hoop 15, an input port 21 and an air inlet 22.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The micro-nano-scale gas-liquid mixing preparation device shown in fig. 1-5 is used for generating micro-nano bubbles, utilizes physical and chemical characteristics of the nano bubbles, and is widely applied to the fields of sewage treatment, waste gas treatment, beauty treatment, aquaculture, cleaning, water-based cultivation and the like. The device utilizes an inner ceramic tube, a middle ceramic tube and an outer cabin body to respectively form a mixing chamber and a storage chamber. The liquid and the gas overflowing from the inner ceramic tube are fully mixed in the mixing chamber to generate a first gas-liquid mixture. And then the second gas-liquid mixture is obtained by cutting the intermediate ceramic tube. And finally, obtaining the micro-nano gas-liquid mixture which meets the flow demand and has uniform bubble particle size through flow regulation, wherein the energy of the bubbles in the obtained micro-nano gas-liquid mixture is more, the bursting strength is higher, the uniformity is better, and the applicable range is wider.
As shown in fig. 1, a micro-nano-scale gas-liquid mixing preparation device includes an input cover 2, an outer chamber 8, an output cover 11 and a bubble generation device. The bubble generating means comprises an inner ceramic tube 6 and an intermediate ceramic tube 7. The side walls of the middle ceramic tube 7 and the inner ceramic tube 6 are both provided with nano ceramic films, and the nano ceramic films are composed of a plurality of layers of densely arranged nano micropores. So set up, through the nanometer ceramic membrane of selecting to have not unidimensional nanometer micropore, and then be favorable to realizing the control and the screening to the diameter of the bubble that produces, further improved the homogeneity of bubble in the micro-nano level gas-liquid mixture. The nanoceramic film may include a nanoceramic film made of alumina, silicon carbide, boron carbide, silicon oxide, or the like.
The input cover 2 is fixedly mounted at the head end of the outer hull 8. The output cover 11 is attached to the rear end of the outer hull 8 and rotates relative to the outer hull 8. The middle ceramic tube 7 is placed inside the outer chamber 8. A storage chamber is formed between the outer wall of the middle ceramic tube 7 and the inner wall of the outer chamber body 8. The inner ceramic tube 6 is placed inside the middle ceramic tube 7. A mixing chamber is formed between the inner wall of the intermediate ceramic tube 7 and the outer wall of the inner ceramic tube 6.
As shown in fig. 1, the input cover body 2 is connected with the external cabin body 8 through the upper fixing clamp 1, so that the input cover body 2 can be conveniently installed and detached, the input annular sealing gasket 3 is arranged between the input cover body 2 and the external cabin body 8, and the input annular sealing gasket 3 can form a better sealing effect on a cavity between the input cover body 2 and the external cabin body 8 by adjusting the tightness of the upper fixing clamp 1.
The input cover 2 has an input port 21 and an intake port 22. The inlet 21 is for liquid entry. The gas inlet 22 is for gas entry. The end face of the tail end of the input cover body 2 is provided with a mounting hole. The head end of the middle ceramic tube 7 is fixedly arranged in the mounting hole. A first sealing structure is arranged between the middle ceramic tube 7 and the input cover body 2. As shown in fig. 1, the first sealing structure may be selected as an intermediate ceramic tube sealing ring 4, and the intermediate ceramic tube sealing ring 4 is used to prevent liquid from leaking from the head end of the intermediate ceramic tube 7, so as to prevent the liquid from directly entering the storage chamber along the outer wall of the intermediate ceramic tube 7, thereby facilitating sufficient contact and mixing between the liquid and the gas.
The head end of the inner ceramic tube 6 is connected to the gas inlet 22 through a gas tube. A second sealing structure is arranged between the inner ceramic tube 6 and the air tube. The second sealing structure can be selected as an internal ceramic tube sealing ring 5, and the internal ceramic tube sealing ring 5 is used for preventing gas from leaking from the head end of the internal ceramic tube 6, so that the utilization rate of the gas is improved.
The end surface of the tail end of the outer cabin body 8 is provided with a first flow hole. The outer cabin 8 is provided with a ceramic tube fixing seat 10 inside. The tail end of the middle ceramic tube 7 and the tail end of the inner ceramic tube 6 are both fixedly arranged on the ceramic tube fixing seat 10. The ceramic tube fixing seat 10 is provided with a third sealing structure for respectively sealing the tail end of the middle ceramic tube 7 and the tail end of the inner ceramic tube 6. The third sealing structure may be selected to be a double sealing ring, an inner layer of which is used to prevent gas from leaking from the tail end of the inner ceramic tube 6, and an outer layer of which is used to prevent liquid from leaking from the tail end of the middle ceramic tube 7.
The first sealing structure, the second sealing structure and the third sealing structure can form sealing by filling sealing glue in gaps at joints, so that the pressure of liquid and gas in equipment is maintained, and the generation rate of micro-nano bubbles is further increased.
The end surface of the head end of the output cover 11 is provided with a second flow hole. The size of the overlapping area of the first flow orifice and the second flow orifice changes with the rotation of the output cover 11. The output cover 11 has an output port for discharging the micro-nano-scale gas-liquid mixture.
As shown in fig. 1, the output cover 11 is connected to the outer hull 8 by a lower fixing clip 12. An output annular sealing gasket 9 is arranged between the output cover body 11 and the outer cabin body 8. Due to the arrangement, on one hand, the output cover body 11 is convenient to mount and dismount, and meanwhile, the output annular sealing gasket 9 has a better sealing effect; on the other hand when adjusting loose fixed clamp 12, be convenient for adjust the turned angle of output lid 11 for outside cabin body 8 to adjust the coincidence area of first flow orifice and second flow orifice, and then be convenient for realize the regulation to the delivery outlet discharge liquid flow size.
As shown in fig. 2, the upper and lower retainer clips 1 and 12 each have two semi-annular clips. One end of one of the semi-annular bands is connected to one end of the other semi-annular band by a connector 14 to form a connection end of the band. The connecting piece 14 is provided with a rotating shaft, and the semi-annular hoop can rotate around the rotating shaft to realize the opening and closing of the fixed hoop. The free end of the clip is locked by a fastening screw 13. The tightness of the fastening screw 13 is adjusted, and then the tightness of the fixed hoop is adjusted.
As shown in fig. 1, the plurality of first flow orifices are arranged in an annular array on the end face of the aft end of the outer hull 8. The plurality of second flow holes are arranged in the same annular array on the output cover 11. The aperture of the second flow hole is equal to that of the first flow hole, so that the overlapping area of the first flow hole and the second flow hole can be calculated conveniently, and accurate adjustment of flow can be realized. The number and the pore size of the first flow orifice and the second flow orifice can be selected according to the actual flow regulation range. The number of the first flow holes and the second flow holes can be 2, 3, 4, 5, 6 and the like. As shown in fig. 1, in order to increase the adjustment range of the flow rate, the number of the first flow orifices and the second flow orifices is each selected to be 12.
In order to further increase the flow rate without affecting the generation rate of nano-scale bubbles, a plurality of groups of bubble generation devices can be installed in the outer chamber body 8. A plurality of mounting holes are provided in the end surface of the rear end of the input cover 2. And each mounting hole is internally provided with a bubble generating device. The head end of each inner ceramic tube 6 is connected to the gas inlet 22 through a gas pipe. So set up, be convenient for install a plurality of bubble generating device in outside cabin body 8, be favorable to when increasing the flow of input liquid and gas and their pressure, can also guarantee the content of nanometer bubble in the micro-nanometer gas-liquid mixture.
As shown in fig. 3, 3 sets of bubble generating devices are installed inside the outer hull 8. A middle fixing clamp 15 is further arranged in the middle of the outer cabin 8 to further improve the structural strength of the equipment and facilitate installation and disassembly. As shown in fig. 4, 3 mounting holes are provided in the end surface of the rear end of the input cover 2. The 3 mounting holes are arranged in an equilateral triangle on the end face of the tail end of the input cover body 2. So set up, be favorable to further improving the speed that nanometer bubble produced, equilateral triangle's arrangement structure is favorable to reducing the mutual interference between 3 groups of bubble generating devices, further guarantees the homogeneity of bubble. According to the actual requirement, a corresponding number of bubble generating devices can be installed in the outer chamber 8 and other arrangement modes can be selected. For example, the number of bubble generating devices may be selected to be 1, 2, 3, 4, etc.
In order to further improve the content of the nano bubbles in the micro-nano gas-liquid mixture, the pore diameter of the nano micropores of the nano ceramic membrane can be selected according to actual needs. The inner wall of the middle ceramic tube 7 is provided with a first nano ceramic film. The inner wall of the inner ceramic tube 6 is provided with a second nano ceramic film. The pore diameter of the nanometer micropores of the first nanometer ceramic membrane is 2nm-50 nm. The pore diameter of the nanometer micropores of the second nanometer ceramic film is 2nm-10 nm. The pore sizes of the nanometer micropores of the first nanometer ceramic membrane and the nanometer micropores of the second nanometer ceramic membrane are selected to be suitable, so that the nanometer bubbles in the micro-nanometer gas-liquid mixture can be further screened.
When the micro-nano-scale gas-liquid mixing preparation device provided by the invention is used for preparing a gas-liquid mixture, liquid enters the mixing cavity from the input port of the output cover body through the head end of the middle ceramic tube. The gas passes through the gas pipe from the gas inlet, enters the inner ceramic pipe, and then enters the mixing chamber through the nanometer micropores on the inner ceramic pipe. The gas and the liquid are mixed in the mixing chamber to form a first gas-liquid mixture. And the first gas-liquid mixture is divided by the middle ceramic tube to obtain a second gas-liquid mixture. The second gas-liquid mixture is stored in the storage chamber. And the second gas-liquid mixture is discharged from the bottom of the outer cabin body through the flow regulation of the first flow holes and the second flow holes and the output port to obtain the micro-nano gas-liquid mixture which meets the flow demand and has uniform bubble particle size.
The invention also provides a preparation method of the micro-nano-scale gas-liquid mixing preparation device, which comprises the following steps:
step one, introducing liquid into an input port of an input cover body, and introducing gas into an air inlet of the input cover body;
adjusting the pressure value of the gas to a first pressure value, and then adjusting the pressure value of the liquid to a second pressure value;
and step three, adjusting the size of the overlapping area of the first flow hole and the second flow hole, adjusting the flow rate to a first flow rate value, and discharging mixed liquid containing micro-scale bubbles and nano-scale bubbles.
In the actual preparation process, the first pressure value in the second step can be selected to be 0.5MPa-0.8MPa, and the second pressure value can be selected to be 0.5MPa-0.8 MPa. The first flow rate value in step three can be selected from 5L/min-15L/min. The circulation time of the liquid in the fourth step can be selected from 15min to 25 min. The standing time for discharging the liquid in the step five can be selected from 5min to 15 min.
The outer cabin body, the input cover body, the output cover body, the upper fixing hoop, the lower fixing hoop and the middle fixing hoop can be made of 316 stainless steel materials. The device is mainly used for enhancing the high temperature resistance and corrosion resistance of the device and reducing the influence of expansion with heat and contraction with cold on the device. The outer cabin, the input cover, the output cover, the upper fixing clamp, the lower fixing clamp and the middle fixing clamp can also be made of 304 stainless steel materials.
The inner ceramic tube sealing ring, the middle ceramic tube sealing ring, the annular sealing gasket and the double-layer sealing ring can be made of polytetrafluoroethylene materials. The adoption of acid and alkali corrosion resistant materials can realize the mixing of various gases and liquids without causing any damage to equipment, and can realize the preparation of better micro-nano gas-liquid mixture.
The following is the process of testing and detecting the content of bubbles by using the micro-nano-scale gas-liquid mixing device of the invention, and bubbles with the diameter of less than 1 μm are regarded as nano-scale bubbles.
[ EXAMPLES one ]
The implementation conditions are as follows: a group of bubble generating devices are installed in the external cabin body, the pressure of liquid and gas is the same, the porosity of the internal ceramic tube is the same as that of the middle ceramic tube, and the wall thickness of the internal ceramic tube is the same as that of the middle ceramic tube.
Step 1: introducing liquid: water; liquid pressure: 0.5 MPa; introducing gas: compressing air; gas pressure: 0.5 MPa; the porosity of the inner ceramic tube is 2000 meshes, the porosity of the middle ceramic tube is 2000 meshes, the length of the inner ceramic tube and the length of the middle ceramic tube are both 150mm, and the wall thickness is both 3 mm;
step 2: the liquid in the step 1 is connected to an input port, and the gas is connected to a gas inlet pipe, so that no leakage is ensured;
and step 3: firstly, opening gas to 0.5MPa, and then stabilizing the opening pressure of liquid to 0.5 MPa;
and 4, step 4: regulating the contact ratio of the porous structure of the annular array, and controlling the flow at 10L/min;
and 5: circulating 20L of water for 20 min;
step 6: photographing the mixed liquid by using a high-speed camera for measurement, and obtaining that the diameter of the bubbles is 5-10 μm accounting for 12%, the diameter of the bubbles is 1-5 μm accounting for 36%, and the diameter of the bubbles is less than 1 μm accounting for 58%;
and 7: standing for 10min to make the mixed liquid basically transparent, and irradiating with laser pen to form a visible light beam. Standing for 10min for floating and bursting a small amount of large micron-sized and above bubbles;
according to the results of the examples, it can be known that under the conditions of the same water pressure and air pressure, the same porosity of the internal ceramic tube and the middle ceramic tube, the same wall thickness and the like, more micro-bubbles, fewer nano-bubbles and larger flow rate can be obtained.
[ example two ]
The implementation conditions are as follows: a group of gas generating devices are installed in the external cabin body, the pressure of gas is increased on the basis of the first embodiment, the porosity of the middle ceramic tube is increased, and the flow is reduced.
Step 1: introducing liquid: water; liquid pressure: 0.5 MPa; introducing gas: compressing air; gas pressure: 0.8 MPa; the porosity of the internal ceramic tube is 2000 meshes, the porosity of the intermediate ceramic tube is 3000 meshes, the lengths of the internal ceramic tube and the intermediate ceramic tube are both 150mm, and the wall thickness is both 3 mm;
step 2: the liquid in the step 1 is connected to an input port, and the gas is connected to a gas inlet pipe, so that no leakage is ensured;
and step 3: firstly, opening gas to 0.8MPa, and then stabilizing the opening pressure of liquid to 0.5 MPa;
and 4, step 4: regulating the contact ratio of the porous structure of the annular array, and controlling the flow at 5L/min;
and 5: circulating 20L of water for 20 min;
step 6: photographing the mixed liquid by using a high-speed camera to measure, and obtaining that the diameter of the bubbles is 5-10 μm accounting for 7%, the diameter of the bubbles is 1-5 μm accounting for 12%, and the diameter of the bubbles is less than 1 μm accounting for 81%;
and 7: standing for 10min to make the mixed liquid basically transparent, and irradiating with laser pen to form a visible light beam. Standing for 10min for floating and bursting a small amount of large micron-sized and above bubbles;
according to the results of the second embodiment and the results of the first embodiment, the obtained micro-bubble content is generally improved, the nano-bubble content is obviously improved, and the flow is relatively reduced under the condition of changing the porosity and the air inlet pressure of the air inlet pipe and reducing the flow of the outlet water.
[ EXAMPLE III ]
The implementation conditions are as follows: three groups of bubble generating devices are installed in the external cabin body, the pressure of gas is increased on the basis of the first embodiment, the porosity of the middle ceramic tube is increased, the lengths of the middle ceramic tube and the internal ceramic tube are lengthened, and the flow is increased.
Step 1: introducing liquid: water; liquid pressure: 0.5 MPa; introducing gas: compressing air; gas pressure: 0.8 MPa; the porosity of the internal ceramic tube is 2000 meshes, the porosity of the intermediate ceramic tube is 3000 meshes, the lengths of the internal ceramic tube and the intermediate ceramic tube are both 450mm, and the wall thickness is both 3 mm;
step 2: the liquid in the step 1 is connected to an input port, and the gas is connected to a gas inlet pipe, so that no leakage is ensured;
and step 3: firstly, opening gas to 0.8MPa, and then stabilizing the opening pressure of liquid to 0.5 MPa;
and 4, step 4: regulating the contact ratio of the porous structure of the annular array, and controlling the flow at 15L/min;
and 5: circulating 60L of water for 20 min;
step 6: photographing the mixed liquid by using a high-speed camera for measurement, and obtaining that the diameter of the bubbles is 5-10 μm accounting for 6%, the diameter of the bubbles is 1-5 μm accounting for 12%, and the diameter of the bubbles is less than 1 μm accounting for 82%;
and 7: standing for 10min to make the mixed liquid basically transparent, irradiating with laser pen to form a visible light column, and standing for 10min to make a small amount of large bubbles of micrometer size or above float and burst.
According to the third result of the embodiment, when three groups are used simultaneously, the obtained micro-bubbles have less content, the nano-bubbles have higher content and the flow rate is also obviously increased under the conditions of changing the porosity and the air inlet pressure of the air inlet pipe and increasing the flow rate of the outlet water. The results of the second embodiment show that the mixing device can be used in series, and the flow rate is increased without affecting the rate and content of nano-scale bubbles.
From the three groups of embodiments, the gas and liquid pressure required for preparing the mixed liquid with large porosity is relatively small, the flow is large, and the micron-sized bubbles are more; the gas and liquid pressure required for preparing the mixed liquid with small porosity is relatively increased, the flow is relatively reduced, and the content of nano-scale bubbles is obviously improved; under the condition that three groups of devices are used in series, the pressure of gas and liquid is improved, the flow is increased by times, and the content and the quality of nano-scale bubbles are stable and unchanged.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A micro-nano-scale gas-liquid mixing preparation device is characterized by comprising an input cover body, an external cabin body, an output cover body and a bubble generation device, wherein the bubble generation device comprises an internal ceramic tube and a middle ceramic tube;
the input cover body is fixedly arranged at the head end of the outer cabin body, the output cover body is connected to the tail end of the outer cabin body and rotates relative to the outer cabin body, the middle ceramic pipe is arranged inside the outer cabin body, a storage cavity is formed between the outer wall of the middle ceramic pipe and the inner wall of the outer cabin body, the inner ceramic pipe is arranged inside the middle ceramic pipe, and a mixing cavity is formed between the inner wall of the middle ceramic pipe and the outer wall of the inner ceramic pipe;
the input cover body is provided with an input port and an air inlet, the input port is used for liquid to enter, the air inlet is used for gas to enter, the end face of the tail end of the input cover body is provided with a mounting hole, the head end of the middle ceramic tube is fixedly mounted in the mounting hole, and a first sealing structure is arranged between the middle ceramic tube and the input cover body;
the head end of the internal ceramic tube is connected with the air inlet through an air tube, and a second sealing structure is arranged between the internal ceramic tube and the air tube;
the end face of the tail end of the outer cabin body is provided with a first flow hole, a ceramic tube fixing seat is arranged inside the outer cabin body, the tail end of the middle ceramic tube and the tail end of the inner ceramic tube are both fixedly arranged on the ceramic tube fixing seat, and the ceramic tube fixing seat is provided with a third sealing structure for respectively sealing the tail end of the middle ceramic tube and the tail end of the inner ceramic tube;
a second flow hole is arranged on the end face of the head end of the output cover body, the size of the overlapping area of the first flow hole and the second flow hole is changed along with the rotation of the output cover body, and the output cover body is provided with an output port for discharging micro-nano gas-liquid mixture;
the side walls of the middle ceramic tube and the inner ceramic tube are both provided with nano ceramic films, and the nano ceramic films are composed of a plurality of layers of densely arranged nano micropores;
the side wall of the middle ceramic tube is provided with a first nano ceramic film, the side wall of the inner ceramic tube is provided with a second nano ceramic film, the aperture of the nano micropore of the first nano ceramic film is 2nm-50nm, and the aperture of the nano micropore of the second nano ceramic film is 2nm-10 nm.
2. The micro-nano scale gas-liquid mixing preparation device according to claim 1, wherein a plurality of mounting holes are provided on an end surface of the tail end of the input cover body, a bubble generation device is installed in each mounting hole, and a head end of each internal ceramic tube is connected to the gas inlet through a gas pipe.
3. The micro-nano scale gas-liquid mixing preparation device according to claim 2, wherein the end face of the tail end of the input cover body is provided with 3 mounting holes, and the 3 mounting holes are arranged in an equilateral triangle on the end face of the tail end of the input cover body.
4. The micro-nano scale gas-liquid mixing preparation device according to claim 1 or 2, wherein the input cover body and the outer chamber body are connected by an upper fixing clamp, an input annular sealing gasket is arranged between the input cover body and the outer chamber body, the output cover body and the outer chamber body are connected by a lower fixing clamp, and an output annular sealing gasket is arranged between the output cover body and the outer chamber body.
5. The micro-nano scale gas-liquid mixing preparation device according to claim 1, wherein the first sealing structure is a middle ceramic tube sealing ring, the second sealing structure is an inner ceramic tube sealing ring, and the third sealing structure is a double-layer sealing ring.
6. The micro-nano scale gas-liquid mixing preparation device according to claim 1, wherein a plurality of first flow holes are arranged in an annular array on an end face of the tail end of the outer chamber body, a plurality of second flow holes are arranged in the same annular array on the output cover body, and the aperture of the second flow holes is equal to that of the first flow holes.
7. The method for preparing micro-nano bubbles of a micro-nano gas-liquid mixing preparation device according to any one of claims 1 to 6, comprising:
step one, introducing liquid into an input port of an input cover body, and introducing gas into an air inlet of the input cover body;
adjusting the pressure value of the gas to a first pressure value, and then adjusting the pressure value of the liquid to a second pressure value;
and step three, adjusting the size of the superposed area of the first flow hole and the second flow hole, adjusting the flow to a preset flow value, and discharging mixed liquid containing micron-sized bubbles and nanometer-sized bubbles.
8. The method for preparing micro-nano bubbles according to claim 7, further comprising:
and step four, continuously circulating the output liquid obtained in the step three in the device for a period of time and then discharging the output liquid.
9. The method for preparing micro-nano bubbles according to claim 8, further comprising:
and step five, standing the liquid discharged in the step four to be in a transparent state.
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| CN109701457A (en) * | 2019-03-05 | 2019-05-03 | 北京化工大学 | A kind of overweight excitability micro-bubble generation device and reaction system |
| CN109876684A (en) * | 2019-03-22 | 2019-06-14 | 大连理工大学 | A kind of nano-bubble generating apparatus of laboratory controllable grain size |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109701457A (en) * | 2019-03-05 | 2019-05-03 | 北京化工大学 | A kind of overweight excitability micro-bubble generation device and reaction system |
| CN109876684A (en) * | 2019-03-22 | 2019-06-14 | 大连理工大学 | A kind of nano-bubble generating apparatus of laboratory controllable grain size |
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