CN116059877B - Gas-liquid mixing stirring device based on dynamic wind distribution - Google Patents
Gas-liquid mixing stirring device based on dynamic wind distribution Download PDFInfo
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- CN116059877B CN116059877B CN202310286134.3A CN202310286134A CN116059877B CN 116059877 B CN116059877 B CN 116059877B CN 202310286134 A CN202310286134 A CN 202310286134A CN 116059877 B CN116059877 B CN 116059877B
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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
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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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
- 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
- B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a gas-liquid mixing stirring device based on dynamic air distribution, which comprises a stirring shaft, an upper cover plate, a lower cover plate, blades, an air distribution block, an air inlet ring and an air inlet pipe, wherein the upper cover plate is arranged on the upper cover plate; the upper cover plate is annular, the stirring shaft penetrates through the inner ring of the upper cover plate and then is fixed on the lower cover plate, and the blades are arranged between the upper cover plate and the lower cover plate and are uniformly distributed along the circumferential direction; the plurality of air distribution blocks are fixed on the lower cover plate and are positioned in the radial inner area of the plurality of blades; the lower cover plate is provided with a plurality of through grooves, an air passage is formed in the air distribution block, the end face of the air distribution block, which is positioned at the radial outer side, is provided with an air outlet groove, and the through grooves are communicated with the air outlet groove through the air passage; the air inlet ring is fixed on the lower end face of the lower cover plate and is sleeved with the through grooves, and the air inlet pipe is inserted into the inner side of the air inlet ring from bottom to top. By adopting the technical scheme, the gas-liquid mixing and stirring device based on dynamic air distribution can realize efficient gas-liquid mixing and reduce stirring power consumption.
Description
Technical Field
The invention relates to a gas-liquid mixing and stirring device based on dynamic air distribution, and belongs to the technical field of mixing and stirring instruments.
Background
The gas-liquid mixing stirring device is widely applied to industries such as petrochemical industry, biological fermentation, water treatment and the like, and is used for uniformly dispersing gas so as to increase the contact area of gas and liquid and finally improve the gas-liquid mass transfer rate. Six straight blade disk turbines were successfully used in the field of gas-liquid mixing since the 50 s of the 20 th century. And a vent pipe or a vent ring is arranged below the six-straight-blade disc turbine to initially disperse the gas, and the ascending gas is further dispersed through the disc turbine to realize gas-liquid mixing.
Researchers have employed cavitation theory to analyze gas dispersion processes. Cavitation theory shows that when a six-straight-blade disc turbine is used for dispersing gas, low-pressure vortex is formed on the back surface of the blade, and gas sucked into the lower part of the blade forms cavitation. Under the shearing action of the stirring paddle, the air cavity breaks at the tail part to form a large number of dispersion areas of small bubbles, and the centrifugal force generated by the high-speed rotation of the stirring paddle blade drives the liquid near the paddle to rotate, so that the small bubbles are thrown out under the action of the centrifugal force to form gas-liquid mixture. The traditional six-straight-blade disc turbine blade has small gas bearing capacity and is easy to generate flooding. Researchers improve straight blade disc turbine paddles according to cavitation theory, optimize straight blade into semicircle pipe, parabolic blade, asymmetric concave blade etc. form to improve the gas bearing capacity of paddle, for example chinese patent document CN113731219a discloses a sweepback disc turbine stirring paddle, improves traditional straight blade into sweepback concave blade face to improve gas bearing capacity, reduce stirring consumption, like chinese patent document CN105854664a also discloses a gas-liquid dispersion stirrer device of assembly fan ring type concave blade, improves traditional straight blade into fan ring type concave blade in order to high-efficient, energy-conserving realization gas-liquid mixing.
Summarizing the existing gas-liquid dispersing and stirring device, the existing disc turbine blades and the initial gas dispersing device are independent, and gas is initially dispersed through a gas distribution ring or a gas distribution pipe, and then is further dispersed through the turbine blades in the rising process. In the gas rising process, part of the gas enters the turbine blade negative pressure area to form small bubbles for dispersion, and meanwhile part of the gas can bypass the blade to enter the liquid phase main body, so that the overall gas-liquid mixing effect is affected. In addition, the existing turbine blade is an open turbine, besides the pushing effect of the projection of the blades on the fluid, the upper edges and the lower edges of the blades also have shearing effect on the fluid, and extra shearing power consumption is increased. In order to further improve the gas-liquid mixing effect and reduce the stirring power consumption, the invention provides a gas-liquid mixing stirring device based on dynamic air distribution.
Disclosure of Invention
Therefore, the invention aims to provide a gas-liquid mixing stirring device based on dynamic air distribution, so as to enhance the gas-liquid mixing effect of the stirring device and reduce the stirring power consumption.
In order to achieve the purpose, the gas-liquid mixing stirring device based on dynamic air distribution comprises a stirring shaft, an upper cover plate, a lower cover plate, blades, an air distribution block, an air inlet ring and an air inlet pipe; the upper cover plate is annular, the stirring shaft penetrates through the inner ring of the upper cover plate and then is fixed on the lower cover plate, and the blades are arranged between the upper cover plate and the lower cover plate and are uniformly distributed along the circumferential direction; the plurality of air distribution blocks are fixed on the lower cover plate and are positioned in the radial inner area of the plurality of blades; the lower cover plate is provided with a plurality of through grooves, an air passage is formed in the air distribution block, the end face of the air distribution block, which is positioned at the radial outer side, is provided with an air outlet groove, and the through grooves are communicated with the air outlet groove through the air passage; the air inlet ring is fixed on the lower end face of the lower cover plate and is sleeved with the through grooves, and the air inlet pipe is inserted into the inner side of the air inlet ring from bottom to top.
The air outlet position of the air distribution block is positioned on the back liquid surface of the blade, and the included angle between the air outlet direction and the blade is 0-45 degrees.
The rotating radius of the air outlet groove of the air distribution block does not exceed the rotating radius of the radial inner edge of the blade.
The number of the air distribution blocks is n times of the number of the blades, and n is more than or equal to 1.
The height of the air outlet groove is 0.1-0.9 times of the height of the blade.
The upper edge and the lower edge of the blade are respectively fixed on the upper cover plate and the lower cover plate, the number of the blades is 2-36, and the types of the blades are asymmetric concave blades, symmetric concave blades, semicircular pipes, semi-elliptical pipes, straight blades or oblique blades.
The ratio of the height of the air inlet ring to the height of the blades is 0.5-20, and the radius of the air inlet ring is larger than the rotation radius of the outer edge of the through groove on the lower cover plate.
The inner ring of the upper cover plate forms a liquid suction inlet, the radius of the liquid suction inlet is smaller than the rotation radius of the radial inner side edge of the blade, and the ratio of the radius of the outer edges of the upper cover plate and the lower cover plate to the rotation radius of the radial outer side edge of the blade is 0.5-2.0.
The air outlet of the air inlet pipe is higher than the lower edge of the air inlet ring.
By adopting the technical scheme, in the gas-liquid mixing stirring device based on dynamic air distribution, during the gas-liquid mixing process, gas enters the gas inlet ring through the gas inlet pipe, enters the air passages of the air distribution blocks through the through grooves reserved on the lower cover plate, and is sprayed outwards through the gas outlet grooves of the air distribution blocks to finish dynamic air distribution. In the process of rotating the stirring device, on one hand, a large amount of liquid is sucked through the liquid suction inlet formed by the inner ring of the upper cover plate and is discharged to the radial outside by the blades, so that the liquid phase main body is circulated, and on the other hand, the blades can form a negative pressure area on the back liquid surface when pushing the liquid. Because the air outlet of the air distribution block is aligned to the negative pressure area of the back liquid surface of the blade, all the air is sucked into the negative pressure area to form stable air pockets, and then the air pockets are further dispersed to form fine air bubbles based on the air pocket theory and enter the liquid phase circulation main body, so that efficient air-liquid mixing is finally realized. In addition, as the cover plates are additionally arranged on the upper and lower sides of the blades, the shearing of the upper and lower edges of the blades to the liquid phase main body is avoided, and therefore the power consumption of the liquid-gas-liquid mixing and stirring device is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of a gas-liquid mixing stirring device based on dynamic air distribution.
Fig. 2 is a schematic distribution diagram of the air distribution block.
Fig. 3 is a schematic structural diagram of the gas-liquid mixing experiment in example 1.
Fig. 4 is a schematic top view of the blade and air distribution block distribution structure in embodiment 1.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1 and 2, the invention provides a gas-liquid mixing stirring device based on dynamic air distribution, which comprises a stirring shaft 1, an upper cover plate 2, a lower cover plate 3, blades 4, an air distribution block 5, an air inlet ring 6 and an air inlet pipe 7.
The upper cover plate 2 is annular, the stirring shaft 1 penetrates through the inner ring of the upper cover plate 2 and then is fixed on the lower cover plate 3, and the blades 4 are arranged between the upper cover plate 2 and the lower cover plate 3 and are uniformly distributed along the circumferential direction.
A plurality of air distribution blocks 5 are fixed on the lower cover plate 3 and are positioned in the radially inner areas of the plurality of blades 4; the lower cover plate 3 is provided with a plurality of through grooves 31, an air passage is formed in the air distribution block 5, an air outlet groove 51 is formed in the end face of the air distribution block 5, which is positioned on the radial outer side, and the through grooves 31 are communicated with the air outlet groove 51 through the air passage.
The air inlet ring 6 is fixed on the lower end surface of the lower cover plate 3 and is sleeved with a plurality of through grooves 31, and the air inlet pipe 7 is inserted into the inner side of the air inlet ring 6 from bottom to top.
The air outlet position of the air distribution block 5 is positioned on the back liquid surface of the blade, and the included angle between the air outlet direction and the blade 4 is 0-45 degrees.
The radius of rotation of the air outlet grooves 51 of the air distribution block 5 does not exceed the radius of rotation of the radially inner edges of the blades 4.
The number of the air distribution blocks 5 is n times that of the blades 4, and n is more than or equal to 1.
The height of the air outlet groove 51 is 0.1-0.9 times of the height of the blade 4.
The upper edge and the lower edge of the blade 4 are respectively fixed on the upper cover plate 2 and the lower cover plate 3, the number of the blades 4 is 2-36, and the types of the blades 4 are asymmetric concave blades, symmetric concave blades, semicircular pipes, semi-elliptic pipes, straight blades or oblique blades.
The ratio of the height of the air inlet ring 6 to the height of the blades 4 is 0.5-20, and the radius of the air inlet ring 6 is larger than the rotation radius of the outer edge of the through groove 31 on the lower cover plate 3.
The inner ring of the upper cover plate 2 forms a liquid suction inlet, the radius of the liquid suction inlet is smaller than the rotation radius of the radial inner side edge of the blade 4, and the ratio of the radius of the outer edges of the upper cover plate 2 and the lower cover plate 3 to the rotation radius of the radial outer side edge of the blade 4 is 0.5-2.0.
The air inlet pipe 7 is inserted into the inner side of the air inlet ring 6, and when the stirring shaft 1 drives the upper cover plate 2, the lower cover plate 3, the blades 4, the air distribution block 5 and the air inlet ring 6 to rotate together, the air inlet pipe 7 is relatively static and sends air into the air inlet ring 6. The air outlet of the air inlet pipe 7 is higher than the lower edge of the air inlet ring 6.
Example 1
In the gas-liquid mixing stirring device based on dynamic wind distribution of the embodiment, the number of the blades 4 is 6, and the types of the blades 4 are semicircle tubes. The rotation diameter of the outer edge of the blade 4 is 0.25m, the diameter of the semicircular tube is 0.05m, and the length is 0.06m. The total of 6 air distribution blocks 5, the air outlet grooves 51 of the air distribution blocks 5 are rectangular openings with the length of 2cm multiplied by 2.5cm, the height of the air distribution blocks 5 is 2.5cm, the air outlet direction of the air outlet grooves 51 is positioned on the back liquid surface of the semicircular tube and forms an included angle of 15 degrees with the blades 4, as shown in fig. 4, the stirring device rotates clockwise in the drawing, the liquid is pushed out by the liquid facing surfaces 4a of the blades, a negative pressure area is formed by the back liquid surfaces 4b of the blades, and the air outlet grooves 51 outlet air towards the negative pressure area so as to achieve better dispersing effect.
The outer edge diameter of the upper cover plate 2 and the lower cover plate 3 is 0.26m, the diameter of the inner ring of the upper cover plate 2 is 0.12m, the lower cover plate 3 is provided with 6 rectangular through grooves 31, and the sizes of the through grooves 31 are 2cm multiplied by 2cm. The air inlet ring 6 is fixed on the bottom surface of the lower cover plate 3, the inner diameter of the air inlet ring 6 is 0.12m, and the height is 0.04m. The air outlet of the air inlet pipe 7 is inserted into the air inlet ring 6, and the air outlet is 0.01m higher than the bottom edge of the air inlet ring 6.
The gas-liquid mixing and stirring device 200 based on dynamic wind distribution is placed in a gas-liquid mixing experimental device shown in fig. 3, and stirring power consumption and gas-liquid dispersing effect are evaluated. The diameter of the stirring kettle body 100 is 0.48m, and the liquid level height is 0.5m. A baffle 101 is arranged in the stirring kettle body 100,
before the experiment started, water was filled into the stirred tank body 100, and the liquid level reached 0.5m. The bottom is filled with a certain amount of air through an air inlet pipe 7. Monitoring stirring torque through a torque sensor 102 in the experimental process to calculate the power consumption of the stirring device; meanwhile, the dissolved oxygen probe 103 detects the change of the dissolved oxygen concentration and sends the data to the computer 104 in real time for calculating the gas-liquid mass transfer coefficient. At a stirring speed of 186rpm, aeration rate was 6m 3 Under the condition of/h, stirring power and mass transfer coefficient of 0.3kW and 0.01s are obtained through experiments -1 。
Comparative example 1:
comparative example 1 was conducted in the stirring vessel shown in fig. 3, the stirrer was replaced with a six-semicircular-tube disk turbine blade, the outer edge rotation diameter of the blade 4 was 0.25m, the semicircular tube diameters and lengths were 0.05m and 0.06m, respectively, and the disk diameter was 0.17m.
In practiceIn the testing process, the power consumption and the gas-liquid mixing stirring effect of the six-semicircle-tube disc turbine stirrer are evaluated. The diameter of the stirring kettle body is 0.48m, and the liquid level height is 0.5m. Before the experiment starts, water is filled into the stirring kettle body, and the liquid level reaches 0.5m. The stirring torque was monitored during the experiment to stir the device power consumption. The dissolved oxygen probe is used for detecting the change of the concentration of the dissolved oxygen and calculating the gas-liquid mass transfer coefficient. At a stirring speed of 186rpm, aeration rate was 6m 3 Under the condition of/h, stirring power and mass transfer coefficient of 0.5kW and 0.008s are obtained through experiments -1 。
As can be seen from the embodiment 1 and the comparative example 1, in the gas-liquid mixing process, the power consumption of the gas-liquid mixing stirring device based on dynamic wind distribution can be reduced by 40% compared with that of a semicircular tube disc turbine blade, and the mass transfer coefficient is improved by 25%. Compared with the existing disk turbine blade for gas-liquid dispersion, the dynamic gas distribution-based gas-liquid mixing stirring device has the advantages of low energy consumption and better gas-liquid mixing effect.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. Gas-liquid mixing stirring device based on dynamic air distribution, which is characterized in that: comprises a stirring shaft, an upper cover plate, a lower cover plate, blades, an air distribution block, an air inlet ring and an air inlet pipe; the upper cover plate is annular, the stirring shaft penetrates through the inner ring of the upper cover plate and then is fixed on the lower cover plate, and the blades are arranged between the upper cover plate and the lower cover plate and are uniformly distributed along the circumferential direction; the plurality of air distribution blocks are fixed on the lower cover plate and are positioned in the radial inner area of the plurality of blades; the lower cover plate is provided with a plurality of through grooves, an air passage is formed in the air distribution block, the end face of the air distribution block, which is positioned at the radial outer side, is provided with an air outlet groove, and the through grooves are communicated with the air outlet groove through the air passage; the air inlet ring is fixed on the lower end face of the lower cover plate and is sleeved with the plurality of through grooves, and the air inlet pipe is inserted into the inner side of the air inlet ring from bottom to top; the air outlet position of the air distribution block is positioned on the back liquid surface of the blade, and the included angle between the air outlet direction and the blade is 0-45 degrees; the rotating radius of the air outlet groove of the air distribution block does not exceed the rotating radius of the radial inner edge of the blade;
the radius of the air inlet ring is larger than the rotation radius of the outer edge of the through groove on the lower cover plate;
the air outlet of the air inlet pipe is higher than the lower edge of the air inlet ring.
2. The dynamic air distribution based gas-liquid mixing stirring device as set forth in claim 1, wherein: the number of the air distribution blocks is n times of the number of the blades, and n is more than or equal to 1.
3. The dynamic air distribution based gas-liquid mixing stirring device as set forth in claim 1, wherein: the height of the air outlet groove is 0.1-0.9 times of the height of the blade.
4. A dynamic air distribution based gas-liquid mixing stirring device according to any one of claims 1-3, wherein: the upper edge and the lower edge of the blades are respectively fixed on the upper cover plate and the lower cover plate, and the number of the blades is 2-36.
5. A dynamic air distribution based gas-liquid mixing stirring device according to any one of claims 1-3, wherein: the blade type is asymmetric concave blade, symmetric concave blade, semicircle tube, straight blade or oblique blade.
6. A dynamic air distribution based gas-liquid mixing stirring device according to any one of claims 1-3, wherein: the ratio of the height of the air inlet ring to the height of the blades is 0.5-20.
7. A dynamic air distribution based gas-liquid mixing stirring device according to any one of claims 1-3, wherein: the inner ring of the upper cover plate forms a liquid suction inlet, the radius of the liquid suction inlet is smaller than the rotation radius of the radial inner side edge of the blade, and the ratio of the radius of the outer edges of the upper cover plate and the lower cover plate to the rotation radius of the radial outer side edge of the blade is 0.5-2.0.
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| CN202310286134.3A CN116059877B (en) | 2023-03-23 | 2023-03-23 | Gas-liquid mixing stirring device based on dynamic wind distribution |
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| CN202310286134.3A CN116059877B (en) | 2023-03-23 | 2023-03-23 | Gas-liquid mixing stirring device based on dynamic wind distribution |
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| CN116059877B true CN116059877B (en) | 2023-06-06 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101172217A (en) * | 2006-11-01 | 2008-05-07 | 中国石油化工股份有限公司 | Self-suction gas-liquid mixing impeller |
| CN201324611Y (en) * | 2008-12-16 | 2009-10-14 | 上海吴泾化工有限公司 | Stirring paddle for sucking and dispensing easily autopolymerized gas |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451625B (en) * | 2010-10-15 | 2014-01-01 | 中国石油化工股份有限公司 | Self-suction gas-liquid mixing impeller |
| CN202860428U (en) * | 2012-10-23 | 2013-04-10 | 中国石油化工股份有限公司 | Self-suction pneumatic-hydraulic hybrid impeller |
| CN106422845B (en) * | 2016-12-21 | 2022-04-15 | 山东大学 | Cover plate type six-straight-blade disc turbine stirring paddle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101172217A (en) * | 2006-11-01 | 2008-05-07 | 中国石油化工股份有限公司 | Self-suction gas-liquid mixing impeller |
| CN201324611Y (en) * | 2008-12-16 | 2009-10-14 | 上海吴泾化工有限公司 | Stirring paddle for sucking and dispensing easily autopolymerized gas |
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