CN201658926U - Device for promoting particle aggregation - Google Patents
Device for promoting particle aggregation Download PDFInfo
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- CN201658926U CN201658926U CN2010200493843U CN201020049384U CN201658926U CN 201658926 U CN201658926 U CN 201658926U CN 2010200493843 U CN2010200493843 U CN 2010200493843U CN 201020049384 U CN201020049384 U CN 201020049384U CN 201658926 U CN201658926 U CN 201658926U
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- vortex street
- karman vortex
- particles
- flue
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Abstract
The utility model discloses a device for promoting particle aggregation, which is arranged in a flue on the front end of a deduster. The device comprises a Karman vortex street generator, fixers and deflectors, the fixers are arranged on the wall of the flue, and are connected with the Karman vortex street generator, and the deflectors are arranged on the inner wall of the flue as well. By generating a Karman vortex street, the device can promote the effective aggregation of particles in fluid, thus enhancing the mixing and agglomerating effect of particles and effectively reducing the fine dust emission of the subsequent electric deduster, moreover, the structure is simple, and the cost is low. The utility model can reduce the mass concentration of the fine dust emission of the subsequent electric deduster by 30 to 60 percent, the opacity by 50 to 80 percent and the emission of PM 2.5 by 70 to 90 percent. The gas passage resistance of a single aggregator is not higher than 200Pa. In particular, since the deflectors are adopted, the deflecting effect is better.
Description
[technical field]
The utility model relates to and is used for promoting or improving the device that flows aggregation of particles at fluid, this device can be installed on the air inlet flue of pollution control equipments such as electric cleaner or sack cleaner, fine dust can be aggregated into big particle, improve deduster arresting efficiency thereafter.
[background technology]
Often contain a large amount of pellet (the aerodynamics equivalent diameter claims PM10 less than the fine particle of 10 μ m) in the industrial production discharged flue gas.Pellet (PM10) can stop several days in surrounding air even several weeks, the principal element that be not only and cause air pollution, reduces atmospheric visibility, and be the killer of harm humans health.Pellet can be accumulated in the respiratory system after being sucked by human body, causes multiple disease.More and more discover: the increase of the generation of PM10 and coronary heart disease, myocardial infarction, hypertension and apoplexy (palsy) and death is closely related.It is dark more that tiny more particle enters the position of respiratory tract, big more to the harm of human body.Particle diameter enters alveolar less than the particle of 2 μ m even the lung that can go directly, and participates in blood circulation directly, and damage lung tissue causes a series of pathologies.
No matter be, all exist the health risk that human body is exposed to pellet to some extent in developed country or in developing country.2005 " World Health Organization's air quality criteria " determined standard for PM for the first time, and regulation PM10 average is 20 μ g/m
3, the PM2.5 average is 10 μ g/m
3Global environmental protection institution all controls the discharging of pellet at pay attention to day by day.The electrostatic precipitator of comparatively using always in the dedusting field is better greater than the capture effect of the particle of 10 μ m to particle diameter at present, efficient can reach 99.9% usually, and to PM10, particularly to be that the fine particle of 0.5 μ m～2 μ m captures effect very poor for particle diameter, generally be lower than 90%, when the worst even be lower than 50%, then need increase electric field quantity or reduce wind speed as raising the efficiency; Sack cleaner is handled in the time of can sucking particle also need reduce the rate of filtration, and these all cause not only increasing cost but also increase floor space, for sack cleaner, also can increase air resistance, increases energy resource consumption.
For overcoming the above problems, many companies and research institution have proposed to make the preprocess method of fine particle polymerization before deduster.This method is different from the pre-charged technology of 70～eighties of last century.Polymerization is that coalescent phenomenon takes place in being in contact with one another process the suspended particulate in the gas.But present polyplant is relatively poor to the mixing flocculating result of particle, makes the fine solid particle discharge capacity of follow-up electric cleaner still very high.
[summary of the invention]
The purpose of this utility model solves the problems of the prior art exactly, proposes a kind of device that promotes aggregation of particles, can improve the mixing flocculating result of particle, reduces the fine solid particle discharge capacity of follow-up deduster.
For achieving the above object, the utility model proposes a kind of device that promotes aggregation of particles, be arranged in the flue of deduster front end, comprise Karman vortex street generating means, fixture, deflector, described fixture is arranged on the walling of flue, and be connected with the Karman vortex street generating means, also be provided with deflector on the inwall of described flue.
As preferably, described deflector is " V " shape plate or angle steel.The water conservancy diversion best results of " V " shape plate, angle steel is simple in structure, and cost is low.
As preferably, described Karman vortex street generating means comprises at least one organ timbering volume array, and the cylinder in every organ timbering volume array adopts connecting rod to link together.Simple in structure, produce the effective of Karman vortex street, connect the back and keep cylinder stable.
As preferably, described Karman vortex street generating means comprises two organ timbering volume arrays, and the front row is a n root cylinder, the n-1 root cylinder of back row for being interspersed with the front row, and described deflector is located on the cylinder line of centres of back organ timbering volume array, described n 〉=2.Produce the best results of Karman vortex street, and the water conservancy diversion effect of deflector is best.
As preferably, described cylinder array adopts at least a in cylindrical-array, angle steel array, the sharp edges array of vanes.This 3 class cylinder is easy to make, and cost is low.
As preferably, also comprise connector, described Karman vortex street generating means links to each other with fixture by connector.Described Karman vortex street generating means links to each other with fixture by connector, keeps the stable of Karman vortex street generating means.
The beneficial effects of the utility model: the utility model impels the effective polymerization of particle in the fluid by producing Karman vortex street, has improved the mixing flocculating result of particle, effectively reduces the fine solid particle discharge capacity of follow-up electric cleaner, and simple in structure, and cost is low.The utility model can make the fine solid particle discharge quality concentration of follow-up electric cleaner reduce 30%～60%, and opacity reduces by 50%～80%, and the PM2.5 discharging reduces 70%～90%.Separate unit polymerizer gas is not more than 200Pa by resistance.Particularly adopt deflector, the water conservancy diversion better effects if.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 promotes the structural representation of the device of aggregation of particles for the utility model;
Fig. 2 promotes the transverse sectional view of the device of aggregation of particles for the utility model.
[specific embodiment]
Consult Fig. 1,2, promote the device of aggregation of particles, be arranged in the flue 1 of deduster 6 front ends, comprise Karman vortex street generating means 4, fixture, connector 3, deflector 7, described fixture is arranged on flue 1 wall, the inwall of flue 1 is provided with deflector 7, this fixture can be arranged on the upper end of Karman vortex street generating means 4, at least one end in the lower end, present embodiment adopts suspension insulator 2 as fixture in the upper end, Karman vortex street generating means 4 is suspended in the lower end of suspension insulator 2 by connector 3.Connector 3 adopts rectangular steel pipe, and deflector 7 adopts " V " shape plate or angle steel.
Karman vortex street generating means 4 comprises two organ timbering volume arrays, and the front row is a n root cylinder, and back row is the n-1 root cylinder that is interspersed with the front row, and described deflector is located on the cylinder line of centres of back organ timbering volume array, described n 〉=2.For example: the front row is 4 cylinders 8, and back row is 3 cylinders 8 that are interspersed with the front row, and the cylinder 8 in every organ timbering volume array adopts connecting rods 5 to link together.Described deflector 7 is located on the cylinder line of centres of back organ timbering volume array.
The utility model is based on following understanding:
If the particle motion exists speed and/or direction difference in flowing, then particle will come in contact coalescence.The rotation of fluid (vortex or half vortex) is beneficial to and varies in size most, the contact of quality seriate.In the vortex, flow direction changes constantly, and the mobile Su Du rotation of Internal and external cycle is so different, therefore has speed difference concurrently and direction is poor.Will promote the particle coalescence so in fluid, create vortex.Vortex quantity is many more, the big more contact that can promote particle more of spin intensity, improves the coalescence probability of particle, and vortex is stable more, lasting simultaneously, more the coalescence of energy enhanced particles.
When fluid was walked around the non-streamline object, that the object wake flow left and right sides produces was paired, antisymmetry vortex that arrange, that direction of rotation is opposite alternately, and this vortex group is exactly a Karman vortex street.Its characteristics are as follows:
1, vortex is distributed with rule and more stable.
2, vortex breaks away from it and relies " column " that take place afterwards, does not disappear, but continues to advance downstream, forms vertical vortex row, and the impetus is still powerful, and the duration is of a specified duration, and it is long to continue distance.
3, the particle of different material in the fluid and/or different aerodynamic qualities will be with different track response Karman vortex streets.
Particularly, if Karman vortex street has specific scale and/or size and/or stability, the particle of different-grain diameter will be inhaled into different tracks in the vortex street, improve intergranular collision probability greatly, promote effective polymerization of particle.
The utility model relates to the movement locus that uses Karman vortex street to handle the different-grain diameter particle, thereby improves particle collision and interactional possibility.
Fluid greatly depends on mobile Reynolds number around the flow regime of cylinder.Reynolds number is defined as:
Wherein Re---mobile Reynolds number, dimensionless;
U---speed of incoming flow, m/s;
The equivalent diameter of d---cylinder, m;
The kinematic viscosity of v---fluid, m
2/ s.
When Reynolds number is increased to approximately 2000 the time gradually from 0.1, flowing is in laminar condition; Be in 2000 to 2 * 10 and work as Reynolds number
5Between the time, at this moment flowing is in from the transition zone of laminar flow to turbulent flow; When Reynolds number greater than 2 * 10
5The time, separation has appearred in fluid, flows to become turbulent flow.
The lift-off frequency of Karman vortex street has important function, dimensionless number to the effect of aggregation of particles---and the Strouhal number can be used for weighing Karman vortex street lift-off frequency, and the Strouhal number is defined as:
Wherein S---Strouhal number, dimensionless;
N---vortex street lift-off frequency, 1/s;
D---cylinder equivalent diameter, m;
U---speed of incoming flow, m/s.
Studies show that: for single cylinder, less than 500 o'clock, the Strouhal number increased with Reynolds number at Reynolds number, and in Reynolds number is in 500～6000 scopes the time, the Strouhal base originally remains constant, and no longer the variation with Reynolds number becomes colored, and this constant is approximately 0.21.Be in 6000～2 * 10 at Reynolds number
5In the scope (subcritical), the Strouhal number slightly reduces, (Re=3 * 10 under higher Reynolds number
5～3 * 10
6), Karman vortex street no longer occurs, and further raises and work as Reynolds number, reaches 3 * 10
6When above, Karman vortex street occurs once more, and the Karman vortex street of this moment is the Karman vortex street under the turbulence state.
For cylindrical-array, above-mentioned Strouhal number slightly changes.
Among the embodiment of the present utility model, what the Karman vortex street generating means adopted is cylindrical-array, spreads perpendicular to flue gas and puts, as shown in Figure 2.
Speed of incoming flow U=12.5m/s among the embodiment, turbulence columns diameter d=0.219m, fluid viscosity v=2.6 * 10
-5m
2/ s, then Re=1.05 * 10
5Be in the critical zone of laminar flow and turbulent flow though flow this moment, as long as small sample perturbations is arranged, flowing to become turbulent flow.Owing in the present embodiment flow region a large amount of disturbing sources are arranged, and contain a large amount of particles again, therefore, flowing of flue gas is turbulent flow.So the time Karman vortex street that produces be Karman vortex street under the turbulence state.
From increasing flocculating result, Karman vortex street is flowed through time long more (being that polymeric area is long more) of mixed zone, and fine particle and oarse-grained collision opportunity are just more, and flocculating result can be better.But oversize meeting increases drag losses, also can increase equipment investment.But back row's turbulence columns reaches the one-period length l of body-shedding vortex at least to the length of polymerizer end.
The relation of l and other parameter is as follows:
Wherein d is the diameter of turbulence columns (cylinder in the Karman vortex street generating means), and S is the Strouhal number.Experiment shows that when producing Karman vortex street, the Strouhal number is 0.2～0.27.As approximate, as get S=0.27, then l ≈ 4d.Therefore, back row turbulence columns need be greater than 4 times of turbulence columns diameter to the length of polymerizer end.Among the embodiment of the present utility model, the length of polymeric area is 1.9m, satisfies 1.4≤T/d≤3.6,2.2≤L/d≤3.6 simultaneously.This moment, to produce the body-shedding vortex diameter be 0.4m, and the body-shedding vortex frequency is 13/second a Karman vortex street, changes the movement locus of different-grain diameter particle, and make that particle bumps, polymerization.Produced the Karman vortex street of certain scale, size after the turbulence columns, the particle of two kinds of different-grain diameters mixes in a large number, collides.
Though the utility model illustrates and describes by the reference preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.
Claims (6)
1. promote the device of aggregation of particles, be arranged in the flue of deduster front end, it is characterized in that: comprise Karman vortex street generating means, fixture, deflector, described fixture is arranged on the walling of flue, and be connected with the Karman vortex street generating means, also be provided with deflector on the inwall of described flue.
2. the device of promotion aggregation of particles as claimed in claim 1 is characterized in that: described deflector is " V " shape plate or angle steel.
3. the device of promotion aggregation of particles as claimed in claim 1 is characterized in that: described Karman vortex street generating means comprises at least one organ timbering volume array, and the cylinder in every organ timbering volume array adopts connecting rod to link together.
4. the device of promotion aggregation of particles as claimed in claim 3, it is characterized in that: described Karman vortex street generating means comprises two organ timbering volume arrays, the front row is a n root cylinder, back row is the n-1 root cylinder that is interspersed with the front row, described deflector is located on the cylinder line of centres of back organ timbering volume array, described n 〉=2.
5. the device of promotion aggregation of particles as claimed in claim 1 is characterized in that: described cylinder array adopts at least a in cylindrical-array, angle steel array, the sharp edges array of vanes.
6. as the device of each described promotion aggregation of particles in the claim 1 to 5, it is characterized in that: also comprise connector, described Karman vortex street generating means links to each other with fixture by connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200493843U CN201658926U (en) | 2010-01-05 | 2010-01-05 | Device for promoting particle aggregation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200493843U CN201658926U (en) | 2010-01-05 | 2010-01-05 | Device for promoting particle aggregation |
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| CN201658926U true CN201658926U (en) | 2010-12-01 |
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ID=43229334
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|---|---|---|---|
| CN2010200493843U Expired - Lifetime CN201658926U (en) | 2010-01-05 | 2010-01-05 | Device for promoting particle aggregation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213811A (en) * | 2017-05-25 | 2017-09-29 | 中国水利水电科学研究院 | Flow mixing device based on Karman vortex street |
-
2010
- 2010-01-05 CN CN2010200493843U patent/CN201658926U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213811A (en) * | 2017-05-25 | 2017-09-29 | 中国水利水电科学研究院 | Flow mixing device based on Karman vortex street |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101201 |