CN110465249A - A kind of regulation size bubble fractal structure strengthens the method and device of mass transfer - Google Patents
A kind of regulation size bubble fractal structure strengthens the method and device of mass transfer Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012546 transfer Methods 0.000 title claims abstract description 27
- 230000033228 biological regulation Effects 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 238000010008 shearing Methods 0.000 claims abstract description 39
- 238000005192 partition Methods 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 230000002459 sustained effect Effects 0.000 claims abstract description 3
- 238000006276 transfer reaction Methods 0.000 claims abstract description 3
- 230000005587 bubbling Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 3
- 238000005295 random walk Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 230000014509 gene expression Effects 0.000 claims description 2
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 1
- 230000032258 transport Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J10/00—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor
- B01J10/002—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor carried out in foam, aerosol or bubbles
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Abstract
A kind of regulation size bubble fractal structure strengthens the method and device of mass transfer, it is precisely to describe bubble size distribution using bubble size fractal dimension in bubble reactor, and bubble fractal dimension in bubble reactor is precisely controlled by a point shape bubble method for generation, and obtain and promote bubble reactor mass transfer reaction performance；The present invention relates to air pockets to occur, the fractal structure distribution of minute bubbles generation and bubble population spatially, a part of gas enters throttling passage and forms air pocket, another part gas enters shearing channel and forms minute bubbles, partition on sustained height in reactor occurs for two kinds of bubbles, and bubble population forms Fractal Structure Character of Agri in reactor cross-section and longitudinal section after dispersing member.It is generated using two kinds of bubbles and the fractal structure of bubble decentralised control gas-liquid reactor air entrapment group is distributed, realized and strengthen gas-liquid mass transfer.
Description
Technical field
A kind of regulation size bubble fractal structure strengthens the method and device of mass transfer, and in particular to a kind of with bubble point
The gas-liquid reactor of shape structure, and it is related to the method for generation and control methods of point shape bubble, realize the target for strengthening mass transfer,
It can be used for the fields such as petroleum refining, pharmaceuticals industry, fine chemistry industry, coal chemical industry, electric power, aviation, environment.
Background technique
Bubble shape in gas-liquid reactor has dominated gas-liquid mass transfer and reactivity worth, and the parameter for describing bubble shape is logical
It often include bubble size distribution and bubble position distribution.
Regulation based on bubble shape, in terms of strengthening bubble reactor mass-transfer performance.It, can be with by reducing bubble size
Reactor void fraction is improved, and then improves the gas-liquid mass transfer interfacial area of reactor, lifting body mass tranfer coefficient, it has also become common recognition.
But problem is, bubble size should be controlled should control as unimodal concentration still in which scale and bubble size distribution
Wide range scale.
Around mass-transfer progress, overall mass transfer coefficient KLa=KLA, wherein KLFor liquid phase side mass tranfer coefficient, a is gas
Liquid mass transfer interfacial area.And liquid phase side mass tranfer coefficient is related with liquid phase tubulence energy E (k), KL=f (E (k)), and there are peaks
Value.Turbulent interface, which is more advantageous to, improves gas-liquid mass transfer efficiency, under the conditions of high turbulent interface, liquid phase side Surface Renewal rate
It gets a promotion.
The liquid turbulence (bubble induced turbulence) of bubble induction is detailed by domestic and foreign scholars
Research, larger bubble can lead to more violent fluid eddies.In gas-liquid reactor, smaller bubble provides biggish interface
Area, larger bubble inducing peripheral liquid forms vortex, and then improves the probability at liquid micelle contact mass transfer interface, accelerates gas
Liquid around bubble updates, and a certain proportion of larger bubble can provide liquid phase tubulence energy, larger, smaller bubble the side of coexisting
Method can increase effective mass transfer area and improve liquid phase mass transfer coefficient.Illustrate that bubble size distribution should be a multiple dimensioned model
It encloses, most beneficial for gas liquid reaction.
In terms of bubble size distribution description, bubble diameter size is usually using digital average, Suo Te is average, maximum value,
Minimum value is described, and lacks the method that high unity can carry out mathematical description to bubble population.It is distributed and describes in bubble position
Aspect is described usually using the void fraction of a certain position, and the bubble that can not further provide in unit volume is believed in detail
Breath.Conventional method cause the inside of existing gas-liquid reactor bubble shape can not effective statistics and analysis, hinder reactor
The progress of optimization and development.
Irregular phenomenon (dividing shape) is generally existing in nature, and 1973, mathematician Mang Deboluo was put forward for the first time a point dimension
With the imagination for dividing shape.Point shape is a coarse or scrappy geometry, is segmented into several parts, and each section is all extremely
It is less approximately the shape after whole reduce.
Summary of the invention
The purpose of the present invention is establishing a kind of gas-liquid reactor with bubble fractal structure, and it is related to a point shape bubble
Method for generation and control methods, realize strengthen mass transfer target.
The specific technical solution of the present invention is: a method of regulation size bubble fractal structure strengthens mass transfer, is to utilize
Bubble size fractal dimension precisely to describe bubble size distribution in bubble reactor, and by dividing shape bubble method for generation smart
Bubble fractal dimension in quasi- control bubble reactor, and obtain the method for promoting bubble reactor mass transfer reaction performance；
There are relational expressions for inside reactor bubble diameter and bubble cumulative amount:That is bubble
Fractal scale law, left side of the equal sign represent the number of bubbles that size is more than or equal to λ, and largest air bubbles are having a size of λ in reactormax,
DfFor fractal dimension.
Further, the bubble size fractal dimension be air pocket occur, minute bubbles occur and bubble population spatially
Fractal structure distribution.
The invention also provides a kind of regulation size bubble fractal structures to strengthen the device of mass transfer, and cross section has bubble
The gas-liquid reactor of fractal characteristic, meets the fractal structure of basic unit iterative model generation, and bubble fractal dimension is 1~2；
Longitudinal section has the gas-liquid reactor of bubble fractal characteristic, meets the fractal structure of random walk model generation, bubble FRACTAL DIMENSION
Number is 0.5~2；Horizontal cross-section is refered in particular in the cross section, and vertical section is refered in particular in longitudinal section, and there is the same bubble to divide shape special
Sign.
Further, under the conditions of superficial gas velocity 0.0001m/s~2m/s, body mass tranfer coefficient with fractal dimension increasing
Increase greatly.
Further, the reactor is tank body, and tank base is equipped with gas feed and liquid-inlet；The tank body
It is interior to be equipped with partition 4；
Partition is equipped with several shearing channels 2 that minute bubbles occur, and minute bubbles, shearing occurs by vortex shearing channel
Liquid velocity at the circular hole jet port in channel is 4~20m/s；Vortex shearing channel includes the gas of inducing fluid rotation
The ratio between sectional area of liquid feed inlet and a circular hole jet port, sectional area of gas-liquid feed inlet and circular hole jet port for 1.9~
0.9；
Partition is equipped with several apparatus for redistributing 3；Apparatus for redistributing is the rolling fin that a vertical section is wing, position
In the surface of throttling passage, disc radius is equal to the distance between throttling passage and shearing channel；Shearing upper part of channel is equipped with
Feed inlet circular hole jet orifice 2-1, middle part are equipped with the feed inlet 2-2 in shearing channel, and lower part is equipped with the shearing cavity 2- in shearing channel
3。
The apparatus for redistributing mixes the air pocket and minute bubbles that are occurred, and apparatus for redistributing changes air pocket
Direction is transported to minute bubbles group around；Has fractal characteristic in reactor by the bubble population of apparatus for redistributing, i.e. air pocket is hidden
Body generates multiple dimensioned bubble in minute bubbles group at reactor feed, and bubble diameter range is 0.001~20mm, bubble diameter
Maximum be 2~20mm, the 0.05~0.9 of the total bubble volume of air pocket volume Zhan.
Further, for each bubble apparatus for redistributing, the lead curve of disk can be hyperbola, parabola, two
Section broken line and logarithmic curve.
Further, minute bubbles production method is vortex, venturi, jet stream, impeller etc. based on liquid shear principle,
Air pocket production method is aeration, bubbling etc. based on Throttle Principle.
Further, described device includes the throttling passage that air pocket occurs, the shearing channel and again that minute bubbles occur
Distribution apparatus；Partition is equipped with several throttling passages 1 that air pocket occurs, and atmosphere occurs by throttling passages such as aperture, gaps
It steeps, the gas velocity at throttling passage minimum dimension is 5~50m/s；Throttling passage minimum dimension is 0.1~5mm.
Further, throttling passage and shearing channel are located at same partition, and arrangement 2~6 is cut around each throttling passage
It cuts through.
Further, the gas-liquid reactor is vertical gas-liquid reactor or horizontal type gas and liquid reactor.
The technology of the present invention effect:
The present invention is occurred by air pocket, the fractal structure of minute bubbles generation and bubble population spatially is distributed, a part
Gas enters throttling passage and forms air pocket, and another part gas enters shearing channel and forms minute bubbles, and two kinds of bubbles occur
The partition on sustained height in reactor, bubble population, which is formed after dispersing member in reactor cross-section and longitudinal section, to be divided
Shape structure feature.It is generated using two kinds of bubbles and the fractal structure of bubble decentralised control gas-liquid reactor air entrapment group is distributed,
It realizes and strengthens gas-liquid mass transfer.
Detailed description of the invention
The mass tranfer coefficient of Fig. 1 embodiment 1 and the correspondence diagram for strengthening mass transfer apparatus；
The mass tranfer coefficient of Fig. 2 embodiment 2 and the correspondence diagram for strengthening mass transfer apparatus；
Fig. 3 divides distribution schematic diagram of the shape bubble in reactor；
Fig. 4 has the structural schematic diagram of the gas-liquid reactor of bubble fractal structure；
Symbol description: in figure:
1, throttling passage；2, channel is sheared；3, apparatus for redistributing；4, partition；
2-1, the feed inlet circular hole jet orifice for shearing channel；2-2, the feed inlet for shearing channel；2-3, cutting for channel is sheared
Cut cavity.
Specific embodiment
In the following, the present invention is specifically described by embodiment.It is necessarily pointed out that following embodiment is only
For the invention will be further described, it should not be understood as limiting the scope of the invention, the professional technique people in the field
Some nonessential modifications and adaptations that member's content according to the present invention is made, still fall within protection scope of the present invention.
A kind of vertical gas-liquid reactive mode, cross section have the gas-liquid reactor of bubble fractal characteristic, meet basic unit
The fractal structure that iterative model generates, bubble fractal dimension are 1~2；Longitudinal section has the gas liquid reaction of bubble fractal characteristic
Device, meets the fractal structure of random walk model generation, and bubble fractal dimension is 0.5~2.Superficial gas velocity 0.0001m/s~
Under the conditions of 2m/s, gas-liquid mass tranfer coefficient with higher, body mass tranfer coefficient increases with the increase of fractal dimension.
Fig. 4 is the structural schematic diagram for the gas-liquid reactor that the present invention has bubble fractal structure；Reactor is tank body, tank
Body bottom is equipped with gas feed and liquid-inlet；Partition 4 is equipped in the tank body；
Partition is equipped with several throttling passages 1 that air pocket occurs, and atmosphere occurs by throttling passages such as aperture, gaps
It steeps, the gas velocity at throttling passage minimum dimension is 5~50m/s；Throttling passage minimum dimension is 0.1~5mm；
Partition is equipped with several shearing channels 2 that minute bubbles occur, and minute bubbles, shearing occurs by vortex shearing channel
Liquid velocity at the circular hole jet port in channel is 4~20m/s；Vortex shearing channel includes the gas of inducing fluid rotation
The ratio between sectional area of liquid feed inlet and a circular hole jet port, sectional area of gas-liquid feed inlet and circular hole jet port for 1.9~
0.9；
Throttling passage and shearing channel are located at same partition, arrange 2~6 shearing channels around each throttling passage；
Partition is equipped with several apparatus for redistributing 3；Apparatus for redistributing is the rolling fin that a vertical section is wing, position
In the surface of throttling passage, disc radius is equal to the distance between throttling passage and shearing channel；Shearing upper part of channel is equipped with
Feed inlet circular hole jet orifice 2-1, middle part are equipped with the feed inlet 2-2 in shearing channel, and lower part is equipped with the shearing cavity 2- in shearing channel
3；
The apparatus for redistributing mixes the air pocket and minute bubbles that are occurred, and apparatus for redistributing changes air pocket
Direction is transported to minute bubbles group around.Has fractal characteristic in reactor by the bubble population of apparatus for redistributing, i.e. air pocket is hidden
Body generates multiple dimensioned bubble in minute bubbles group at reactor feed, and bubble diameter range is 0.001~20mm, bubble diameter
Maximum be 2~20mm, the 0.05~0.9 of the total bubble volume of air pocket volume Zhan.For each bubble apparatus for redistributing,
The lead curve of disk can be hyperbola, parabola, two sections of broken lines and logarithmic curve；
Minute bubbles production method is vortex, venturi, jet stream, impeller etc. based on liquid shear principle, and air pocket generates
Method is aeration, bubbling etc. based on Throttle Principle.
In one embodiment, bubble production method is patterns occur for a variety of bubbles combination at reactor feed,
To realize the effect of multiple dimensioned bubble.
In another embodiment, size bubble production method is to shear channel by a kind of vortex to realize, works as gas-liquid
When than being greater than 50, vortex shearing channel not only can produce minute bubbles, also can produce a certain proportion of air pocket.Therefore root
According to needs, throttling passage can be cancelled.
In another embodiment, the sectional area at throttling passage minimum dimension and shearing channel circular hole jet port
The ratio between sectional area is 0.001~0.1, and to realize partition, there are suitable pressure differences up and down.
In one embodiment, gas-liquid reactor is horizontal, then horizontal cross-section is refered in particular in cross section, and longitudinal section refers in particular to erect
Straightforward face has the same bubble fractal characteristic.
Embodiment 1
In 2.2 meters diameter 180mm, height of reactor, carry out oxygen transfer experiment, using traditional bubbling reactor and
Point shape bubble reactor compares and analyzes, as shown in Figure 1, being gas-liquid up-flow fluidised form, superficial gas velocity 0.025m/s, table
Sight liquid speed is 0.0077m/s, and experimental temperature is 15 degrees Celsius, measures KLa, body mass tranfer coefficient such as Fig. 2 using Dynamic Oxygen concentration method
It is shown.When using this method and device to dissolved oxygen in water process, body mass tranfer coefficient is promoted to 0.027 by original 0.015.
Embodiment 2
In diameter 280mm, highly 6 meters of reactor, oxygen transfer experiment is carried out, using traditional bubbling reactor and is divided
Shape bubble reactor compares and analyzes.It is gas-liquid up-flow fluidised form, superficial gas velocity is 0.005~0.025m/s, superficial liquid velocity
For 0.0077m/s, experimental temperature is 15 degrees Celsius, measures KLa using Dynamic Oxygen concentration method, body mass tranfer coefficient is as shown in Figure 2.
When using this method and device to dissolved oxygen in water process, the body mass tranfer coefficient of traditional bubbling reactor is 0.0025~
0.013, the reasonable reactor F body mass tranfer coefficient of fractal dimension is 0.013~0.026, in superficial gas velocity 0.025m/s operating condition
Under, body mass tranfer coefficient is promoted to 2 times of bubbling reactor.
Divide distribution schematic diagram of the shape bubble in reactor as shown in Figure 3；Show point shape bubble in reactor in figure
Interior, in high-speed camera photo, the photo including cross section and longitudinal section, from the tree-like Fractal Analysis of bubble, atmosphere
It is larger to steep raising speed, generates stronger liquid turbulence；Minute bubbles are dispersed in around air pocket.
Claims (10)
1. a kind of method that regulation size bubble fractal structure strengthens mass transfer is to utilize bubble size FRACTAL DIMENSION in bubble reactor
Number precisely describes bubble size distribution, and is precisely controlled bubble FRACTAL DIMENSION in bubble reactor by a point shape bubble method for generation
Number, and obtain the method for promoting bubble reactor mass transfer reaction performance；
There are relational expressions for inside reactor bubble diameter and bubble cumulative amount:Bubble divides shape ruler
Degree, left side of the equal sign represent the number of bubbles that size is more than or equal to λ, and largest air bubbles are having a size of λ in reactormax, DfFor FRACTAL DIMENSION
Number.
2. the method according to claim 1, wherein the bubble size fractal dimension is that air pocket occurs, is small
The fractal structure distribution of bubble generation and bubble population spatially.A part of gas inlet passages form air pocket, another part
Gas inlet passages form minute bubbles, and the partition on the sustained height in reactor occurs for two kinds of bubbles, and bubble population is through excessive
Fractal Structure Character of Agri is formed in reactor cross-section and longitudinal section after scattered component, realizes and strengthens gas-liquid mass transfer.
3. the device that a kind of regulation size bubble fractal structure strengthens mass transfer, which is characterized in that there is bubble to divide shape special for cross section
The gas-liquid reactor of sign, meets the fractal structure of basic unit iterative model generation, and bubble fractal dimension is 1~2；Longitudinal section tool
Have the gas-liquid reactor of bubble fractal characteristic, meet random walk model generation fractal structure, bubble fractal dimension be 0.5~
2；Horizontal cross-section is refered in particular in the cross section, and vertical section is refered in particular in longitudinal section, has the same bubble fractal characteristic.
4. device according to claim 3, which is characterized in that the reactor is tank body, and tank base is equipped with gas
Import and liquid-inlet；Partition is equipped in the tank body；
Partition is equipped with several shearing channels that minute bubbles occur, and minute bubbles occur by vortex shearing channel, shear channel
Liquid velocity at circular hole jet port is 4~20m/s；Vortex shearing channel includes the gas-liquid feed inlet of inducing fluid rotation
With a circular hole jet port, the ratio between the sectional area and the sectional area of circular hole jet port of gas-liquid feed inlet are 1.9~0.9；
Partition is equipped with several apparatus for redistributing；Apparatus for redistributing is the rolling fin that a vertical section is wing, is located at throttling
The surface in channel, disc radius are equal to the distance between throttling passage and shearing channel；
The apparatus for redistributing mixes the air pocket and minute bubbles that are occurred, and apparatus for redistributing changes air pocket and transports direction
To minute bubbles group around；Has fractal characteristic in reactor by the bubble population of apparatus for redistributing, i.e. air pocket is hidden oneself in small
Bubble population, generates multiple dimensioned bubble at reactor feed, and bubble diameter range is 0.001~20mm, bubble diameter it is very big
Being worth is 2~20mm, the 0.05~0.9 of the total bubble volume of air pocket volume Zhan.
5. device according to claim 4, which is characterized in that shearing upper part of channel is equipped with feed inlet circular hole jet orifice, in
Portion is equipped with the feed inlet in shearing channel, and lower part is equipped with the shearing cavity in shearing channel.
6. device according to claim 4, which is characterized in that for each bubble apparatus for redistributing, the guiding of disk is bent
Line is hyperbola, parabola, two sections of broken lines or logarithmic curve.
7. device according to claim 4, which is characterized in that minute bubbles production method is the whirlpool based on liquid shear principle
Stream, venturi, jet stream or impeller；Air pocket production method is aeration or bubbling based on Throttle Principle.
8. device according to claim 4, which is characterized in that described device includes the throttling passage that air pocket occurs, hair
Tiff bubble shearing channel and apparatus for redistributing；Partition be equipped with it is several occur air pockets throttling passages, by aperture,
Air pocket occurs for the throttling passages such as gap, and the gas velocity at throttling passage minimum dimension is 5~50m/s；Throttling passage is minimum
Having a size of 0.1~5mm.
9. device according to claim 8, which is characterized in that the throttling passage and shearing channel are located at same partition,
2~6 shearing channels are arranged around each throttling passage.
10. device according to claim 4, which is characterized in that the gas-liquid reactor is vertical gas-liquid reactor or crouches
Formula gas-liquid reactor.
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Cited By (4)
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| CN111362394A (en) * | 2020-02-28 | 2020-07-03 | 华东理工大学 | Device and method for efficiently oxidizing waste alkali liquor with fractal distribution of large bubbles and small bubbles |
| CN111359539A (en) * | 2020-02-17 | 2020-07-03 | 华东理工大学 | Gas-liquid reaction method and gas-liquid reaction device capable of entering reaction preparation state in advance |
| CN113663635A (en) * | 2021-09-10 | 2021-11-19 | 中国石油大学(华东) | Gas-liquid mass transfer equipment for enhancing mass transfer rate of carbonization reaction |
| CN115448440A (en) * | 2022-07-25 | 2022-12-09 | 中石化宁波工程有限公司 | Fractal oxidation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111359539A (en) * | 2020-02-17 | 2020-07-03 | 华东理工大学 | Gas-liquid reaction method and gas-liquid reaction device capable of entering reaction preparation state in advance |
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| CN111362394A (en) * | 2020-02-28 | 2020-07-03 | 华东理工大学 | Device and method for efficiently oxidizing waste alkali liquor with fractal distribution of large bubbles and small bubbles |
| CN111362394B (en) * | 2020-02-28 | 2022-08-05 | 华东理工大学 | Device and method for efficiently oxidizing waste alkali liquor with fractal distribution of large bubbles and small bubbles |
| CN113663635A (en) * | 2021-09-10 | 2021-11-19 | 中国石油大学(华东) | Gas-liquid mass transfer equipment for enhancing mass transfer rate of carbonization reaction |
| CN115448440A (en) * | 2022-07-25 | 2022-12-09 | 中石化宁波工程有限公司 | Fractal oxidation device |
| CN115448440B (en) * | 2022-07-25 | 2023-10-24 | 中石化宁波工程有限公司 | Fractal oxidation device |
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