CN104623987B - A kind of demister for improving small particle droplet demisting efficiency - Google Patents
A kind of demister for improving small particle droplet demisting efficiency Download PDFInfo
- Publication number
- CN104623987B CN104623987B CN201510056951.5A CN201510056951A CN104623987B CN 104623987 B CN104623987 B CN 104623987B CN 201510056951 A CN201510056951 A CN 201510056951A CN 104623987 B CN104623987 B CN 104623987B
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- Prior art keywords
- demister
- bluff body
- shape plate
- small particle
- housing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The invention discloses a kind of demister for improving small particle droplet demisting efficiency, this demister includes housing, and n be positioned in housing rolls over shape plate and 1 bluff body of n, the bottom of housing is inlet end, the top of housing is outlet side, folding shape plate and bluff body are respectively fixedly connected with on housing, folding shape plate is parallel to each other, and the middle part bending of each folding shape plate, gas channel is formed between adjacent two folding shape plates, bluff body is between the bottom of housing and folding shape plate, and the corresponding gas channel of each bluff body.This demister can improve the small particle droplet demisting efficiency by demister.
Description
Technical field
The present invention relates to a kind of demister, it particularly relates to one is used for improving small particle droplet demisting efficiency
Demister.
Background technology
In fields such as the energy, environmental protection, chemical industry, pharmacy, food processings, exist in mass air flow containing droplet
Needing the occasion removed it from air-flow, this process is referred to as except mist.Such as the process of wet desulphurization of firepower power station,
The gypsum slurries that tower top sprays downwards with in desulfurizing tower, form reverse convection from the sulfur-containing smoke gas at the bottom of tower so that
Flue gas is mixed into a large amount of droplet in sweetening process, it is necessary to ability after being removed by the droplet in flue gas by demister
Entering air by chimney, otherwise the Gypsum Fibrosum in droplet and other sulfate species will be to environments.
Have the demister of multi-form at present, as use that multiple layer metal silk screen or porous media material constitute except mist
Device etc..For firepower power station wet desulphurization, folding shape plate demister because of its have that resistance is little, low cost, suitable
Close atm number scale and remove the advantages such as mist, currently used the most extensive.Existing folding shape plate demister is by a series of flat
Plate is converted into tortuous parallel baffle passage by certain angle and is constituted, and baffle spacing is usually about 30mm, when containing
After the air-flow having droplet enters demister, between plate, in bending channel, constantly change flow direction, according to fluid force
Learning principle, the drop in corner air-flow strikes under the effect of inertia force and is captured on wooden partition, thus from
Air-flow is separated and is formed except mist.This demister pattern to the droplet of big particle diameter (such as d > 30 μm) except mist
Efficiency higher (close to 90%), and fine mist demisting efficiency is drastically declined, as a diameter of 20 μm
Droplet, demisting efficiency be less than 40%.The reason causing this phenomenon is owing to small particle Quality of fogdrop is little, with
Air-flow followability is good to be caused.For the droplet of diameter 30 μm, at the demister baffle plate of 30mm
In passage, channel width is 1000 times of its diameter, when the streamline in passage is approximately parallel to channel wall
In the case of, the chance that small particle droplet hits wall is the least, thus demisting efficiency drastically declines, and this is also to cause at present
The main cause of power plant's periphery " gypsum rain " phenomenon, small particle droplet also will promote the life of haze after entering air
Become.
Summary of the invention
Technical problem: the technical problem to be solved is: provide one to be used for improving small particle droplet and remove
The demister of mist efficiency, improves the small particle droplet demisting efficiency by demister.
Technical scheme: for solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of demister for improving small particle droplet demisting efficiency, this demister includes housing, and is positioned at
N folding shape plate in housing and n-1 bluff body, the bottom of housing is inlet end, and the top of housing is outlet side,
Folding shape plate and bluff body are respectively fixedly connected with on housing, and folding shape plate is parallel to each other, and the middle part of each folding shape plate is curved
Folding, forms gas channel between adjacent two folding shape plates, and bluff body is in the bottom of housing and rolls between shape plate, and
The corresponding gas channel of each bluff body.
Further, described bluff body is positioned on the center line of gas channel.
Further, the cross section of described bluff body is triangular in shape, or rhombus, and bluff body is towards the inlet end of housing
One end is most advanced and sophisticated.
Further, the degree of depth of the middle part bending of described folding shape plate is more than or equal to the width of gas channel.
Further, described demister operationally meets formula (1):
Wherein, Re represents Reynolds characteristic number, and 800≤Re≤150000, and ρ represents current density, unit:
kg/m3；U represents air-flow velocity, unit: m/s；D represents the width of bluff body, unit: m；μ represents gas
Stream viscosity, unit: Pa s.
Further, described bluff body is 4D≤d≤6D to the distance of folding shape plate at d, and the width D of bluff body is:Wherein, d1Represent the distance between adjacent two folding shape plates.
Beneficial effect: compared with prior art, technical scheme has the advantages that
Retaining, template demister pressure drop is low, in the case of being not susceptible to the advantage of blocking, by arranging in front end
Bluff body, guides air-flow to form whirlpool, rely on whirlpool powerful centrifugal action the drop of air-flow entrained with is got rid of to
Wall, reaches more existing template demister preferably except fog effect.The demister of the present invention, including some parallel
The folding shape plate of arrangement and bluff body, bluff body is respectively positioned on folding shape front edge of board.For tradition deflection plate demister, containing droplet
Air-flow is when passing through a certain layer (or level) demister, and air-flow presents approximation streamline flow in gas channel,
And for preposition bluff body flow-disturbing demister disclosed in this invention, by arranging bluff body at folding shape front edge of board, air-flow
Forming eddy current under the effect of bluff body, eddy current drifts about in gas channel with the form of whirlpool, makes air-flow lead to simultaneously
Streamline in road gets muddled, beneficially gas-liquid separation.Result of study shows, at channel plate spacing, folding at present
Shape plate length and flue gas flow rate identical under conditions of, the Novel defroster of the present invention is for 10～20 μm droplets
Demisting efficiency can improve more than 15% than traditional deflection plate demister.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Figure has: housing 1, folding shape plate 2, bluff body 3, gas channel 4.
Detailed description of the invention
Below in conjunction with the accompanying drawings, technical scheme is further described in detail.
Seeing Fig. 1, a kind of demister for improving small particle droplet demisting efficiency of the present invention, including housing
1, and be positioned in housing 1 n folding shape plate 2 and n-1 bluff body 3, the bottom of housing 1 is inlet end,
The top of housing 1 is outlet side, and folding shape plate 2 and bluff body 3 are respectively fixedly connected with on housing 1, rolls over shape plate 2
It is parallel to each other, and the middle part bending of each folding shape plate 2, form gas channel 4 between adjacent two folding shape plates 2,
Bluff body 3 is between the bottom of housing 1 and folding shape plate 2, and the corresponding gas channel 4 of each bluff body 3.
The work process of the demister of said structure is: the air-flow containing droplet enters housing from the bottom of housing 1
In, first under the effect of bluff body 3, air-flow forms eddy current at bluff body 3 rear, and eddy current enters with the form of whirlpool
Entering in gas channel 4, the existence of whirlpool also makes flow field become disorderly, and folding shape plate 3 makes air-flow turn to simultaneously.
Droplet in air-flow, in motor process, is thrown out of under the centrifugal action of whirlpool, and is trapped by wooden partition.This
Invent by bluff body 3 and the synergism of folding shape plate 2, make droplet centrifugal force in whirlpool much larger than in tradition
Simple suffered centrifugal force in folding shape plate.Droplet is separated from air-flow because of powerful centrifugal action,
Trapped by wooden partition.
Further, the cross section, middle part of described folding shape plate 2 is trapezoidal.The shape of the middle part bending of folding shape plate 2 can
There to be various shape.This patent is the most trapezoidal, when air-flow flows in the middle part of gas channel, the change in path occurs
Number of times is three times, adds the medium and small droplet of air-flow and clashes into the probability of folding shape plate 2 wall, enhances demisting efficiency.
Further, described bluff body 3 is positioned on the center line of gas channel 4.Bluff body 3 is positioned at gas channel 4
Center line, the eddy current making bluff body 3 rear produce is directly entered in gas channel 4.
Further, can there be various shape in the cross section of bluff body 3, the preferred following two of this patent: the first: institute
The cross section of the bluff body 3 stated is triangular in shape, or rhombus, and bluff body 3 is point towards one end of the inlet end of housing 1
End.The second: the ellipsoidal cross section of described bluff body 3 or semicircle, and bluff body 3 entering towards housing 1
One end of gas end is arc.Bluff body 3 is arc or tip towards one end of the inlet end of housing 1, both avoids
Being significantly increased of resistance, in turn ensure that the generation of eddy current, the separation of the least droplet.
Further, described n-1 bluff body 3 is in a linear array.So arrangement facilitates each bluff body 3 right
Answer a gas channel center.
Further, the degree of depth of the middle part bending of described folding shape plate 2 is more than or equal to the width of gas channel 4.
So, when the air-flow containing droplet is through gas channel 4, will not directly pass from gas channel 4, it is necessary to
Collide with the middle part of folding shape plate 2, change path, so that it is guaranteed that except fog effect.
Further, for giving full play to eddy current effect, improving demisting efficiency, described demister operationally meets
Formula (1):
Wherein, Re represents Reynolds characteristic number, and 800≤Re≤150000, and ρ represents current density, unit:
kg/m3；U represents air-flow velocity, unit: m/s；D represents the width of bluff body (3), unit: m；μ table
Show air-flow viscosity, unit: Pa s.Described bluff body 3 is 4D≤d≤6D to the distance of folding shape plate 2 at d,
The width D of bluff body 3 is:Wherein, d1Represent adjacent two folding shape plates 3 between away from
From.As preferably, described d1It is 25 35mm.
When demister operationally meets formula (1), the demister of small particle droplet demisting efficiency can be improved.
Below by experimental demonstration.
In demister, the width of bluff body 3 is 7.5mm, and the distance between adjacent two folding shape plates 3 is 30mm,
Bluff body 3 is to rolling over the distance of shape plate 2 at 37.5mm.It is 1.205kg/m by the current density of demister3, gas
Stream flow velocity is 5m/s, and air-flow viscosity is 1.81 ' 10-5Pa·s.Reynolds characteristic number is 10000.Mist in air-flow
Dripping particle diameter is 10 19 μm.
Being arranged in existing wet desulphurization demister by the demister of above-mentioned size, test airflow is by except mist
Demisting efficiency after device.Test result is: before carrying out except mist, and the density of the droplet in air-flow is 10g/m3；
After demister, the density of the droplet in air-flow is 0.1g/m3。
The demister of the present invention, by arranging a bluff body in the front end of each gas channel, when airflow passes bluff body
Time will be alternately produced whirlpool, referred to as vortex street on hydrodynamics, the air-flow containing vortex street enters folding shape plate and leads to
Behind road, the streamline in passage is made to get muddled, it is possible to significantly improve the demisting efficiency of fine mist.The present invention's
Demister arranges bluff body 3 in the inlet end front of folding shape plate 2, it is therefore an objective to make air-flow produce whirlpool after flowing through bluff body
Street, to increase the demister removal efficiency to little droplet.The principle of this patent is: in order to increase small particle droplet
Hit wall chance, make the air-flow of passage lanes contain eddy current, increase the disturbance of air-flow in demister, thus increase
Add the medium and small droplet of air-flow hits wall chance.The little droplet of this patent refers to that particle diameter is less than the droplet of 20 μm.
Bluff body flow-disturbing demister arrangements preposition to one provided by the present invention is described in detail above.Above
Method and the core concept thereof being only intended to help to understand the present invention is described, it is noted that for the art
Those of ordinary skill for, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the demister being used for improving small particle droplet demisting efficiency, it is characterised in that this demister bag
Include housing (1), and n be positioned in housing (1) rolls over shape plate (2) and n-1 bluff body (3), shell
The bottom of body (1) is inlet end, and the top of housing (1) is outlet side, folding shape plate (2) and bluff body (3)
Being respectively fixedly connected with on housing (1), folding shape plate (2) is parallel to each other, and in each folding shape plate (2)
Portion bends, and forms gas channel (4) between adjacent two foldings shape plate (2), and bluff body (3) is positioned at housing (1)
Bottom and folding shape plate (2) between, and the corresponding gas channel (4) of each bluff body (3).
2. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, the cross section, middle part of described folding shape plate (2) is trapezoidal.
3. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, described bluff body (3) is positioned on the center line of gas channel (4).
4. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, the cross section of described bluff body (3) is triangular in shape, or rhombus, and bluff body (3) is towards housing (1)
One end of inlet end be most advanced and sophisticated.
5. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
It is, the ellipsoidal cross section of described bluff body (3) or semicircle, and bluff body (3) is towards housing (1)
One end of inlet end be arc.
6. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, described n-1 bluff body (3) is in a linear array.
7. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, the degree of depth of the middle part bending of described folding shape plate (2) is more than or equal to the width of gas channel (4).
8. according to the demister for improving small particle droplet demisting efficiency described in claim 1, its feature
Being, described demister operationally meets formula (1):
Wherein, Re represents Reynolds characteristic number, and 800≤Re≤150000, and ρ represents current density, unit:
kg/m3；U represents air-flow velocity, unit: m/s；D represents the width of bluff body (3), unit: m；μ table
Show air-flow viscosity, unit: Pa s.
9. according to the demister for improving small particle droplet demisting efficiency described in claim 8, its feature
Being, described bluff body (3) is 4D≤d≤6D to the distance of folding shape plate (2) at d, bluff body (3)
Width D is:Wherein, d1Represent the distance between adjacent two foldings shape plate (2).
10. according to the demister for improving small particle droplet demisting efficiency described in claim 9, its feature
It is, described d1It is 25 35mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056951.5A CN104623987B (en) | 2015-02-03 | 2015-02-03 | A kind of demister for improving small particle droplet demisting efficiency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056951.5A CN104623987B (en) | 2015-02-03 | 2015-02-03 | A kind of demister for improving small particle droplet demisting efficiency |
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| CN104623987B true CN104623987B (en) | 2016-08-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106362501A (en) * | 2016-11-18 | 2017-02-01 | 北京淘氪科技有限公司 | Air purifier and demister thereof |
| CN106902610B (en) * | 2017-03-24 | 2023-03-17 | 中国计量大学 | Sound coagulation synergy demister |
| CN107511028B (en) * | 2017-08-15 | 2020-11-13 | 神华集团有限责任公司 | Water washing tower, gas treatment system and gas treatment method |
| CN113750653B (en) * | 2020-06-03 | 2022-08-19 | 约克（无锡）空调冷冻设备有限公司 | Gas-liquid separator |
| CN113790619B (en) * | 2021-09-26 | 2023-11-07 | 约克（无锡）空调冷冻设备有限公司 | Falling film evaporator |
| CN114797292A (en) * | 2022-05-16 | 2022-07-29 | 大唐环境产业集团股份有限公司 | Large-particle fly ash intercepting device of multilayer corrugated plate type SCR system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087205U (en) * | 2011-05-27 | 2011-12-28 | 中节能六合天融环保科技有限公司 | Desulfurization pre-treatment tower provided with novel guide plates |
| CN202237590U (en) * | 2011-09-23 | 2012-05-30 | 武汉工程大学 | Novel folding-line type two-passage defogger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09290113A (en) * | 1996-04-30 | 1997-11-11 | Mitsubishi Heavy Ind Ltd | Oil mist separator |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087205U (en) * | 2011-05-27 | 2011-12-28 | 中节能六合天融环保科技有限公司 | Desulfurization pre-treatment tower provided with novel guide plates |
| CN202237590U (en) * | 2011-09-23 | 2012-05-30 | 武汉工程大学 | Novel folding-line type two-passage defogger |
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