CN103128001A - Dry-wet combination type electrostatic dust extractor and dust extracting method - Google Patents
Dry-wet combination type electrostatic dust extractor and dust extracting method Download PDFInfo
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- CN103128001A CN103128001A CN2012104970633A CN201210497063A CN103128001A CN 103128001 A CN103128001 A CN 103128001A CN 2012104970633 A CN2012104970633 A CN 2012104970633A CN 201210497063 A CN201210497063 A CN 201210497063A CN 103128001 A CN103128001 A CN 103128001A
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Abstract
The invention relates to a dry-wet combination type electrostatic dust extractor and a dust extracting method directed at extracting fine particulate matters in smoke, and belongs to the technical field of industrial dust extracting. According to the dry-wet combination type electrostatic dust extractor, an existing electric dust extractor is adopted, and two back levels of an electric field are modified. An angle iron long bur wire or a jag wire or a fishbone-shaped polar wire is adopted by a second level electric field counted backward of the dust extractor so as to strengthen a loading effect of the second level electric field counted backward of the dust extractor on particles. A round polar wire is adopted by a last level electric field of the dust extractor so as to increase the working voltage of the last level electric field and form a strong moving electric field, and then the influence of corona wind on a flow field is reduced. The second level electric field counted backward is combined with the last level electric field, so that the moving rate of the particles within 0.1-1 mu m is improved. A plurality of last level dust extracting water jets are arranged above a polar plate of the last level electric field, dust is extracted by washing the polar plate with water instead of beating, completely extraction of the particles attached to the polar plate can be ensured, and secondary dust flying caused by beating in the prior art is relieved.
Description
Technical field
The present invention relates to a kind of dried wet convolution electrostatic precipitator and dust collection method for removing fine particle in flue gas, belong to the industrial dedusting technical field.
Background technology
Coal is the industrial main energy sources such as China's generating, metal smelt, cement manufacturing, still can dominate within coming few decades.Contain a large amount of particles in the flue gas of its burning and exhausting, can cause serious environmental pollution, particularly aerodynamic diameter less than the entered lung particle of 2.5 μ m, it can enter in human body from respiratory tract, and the easy enriched heavy metal in surface, very large to human health damage.
Along with environmental protection standard is constantly strict, only have electric cleaner and sack cleaner can reach emission request in the cleaner of using now.Wherein electrostatic precipitation technology has that separation force is concentrated, gas-flow resistance is little, little power consumption, treatment scale is large, high temperature resistant and the characteristics of anti-strong corruption, uses very extensive in the industrial production of China.The existence of particle in 0.1-1.0 μ m scope penetrates window but it is to particle diameter, and grade dust-collection efficiency is lower than 80%.It is charged that its main cause is that the particle in this particle size range is difficult to, and particle easily with stream, causes reentrainment of dust in the vibration dust-cleaning process.
For PM
2.5The problem that removal efficiency is not high, existing electric cleaner improved procedure mainly contains geometric parameter, the operational factor of optimizing the traditional electrical deduster, adopt pre-coalescence principle to make particle agglomeration by bipolar charge, and by adopting portable pole plate, wet electrical dust precipitator etc. to improve deashing process.Ohio university adopts the overlay film wet electrical dust precipitator, replaces corrosion resistant plate with fibrous material, and forms moisture film at polar board surface, can significantly reduce the use of steel, and reduces reentrainment of dust.(Membrane-based wet electrostatic precipitation, Fuel Processing Technology, 2004,85:781-798.) a kind of electric dust collector of patent (201010607898.0) adopts fine and closely woven woven wire Substitute For Partial polar curve at the electric cleaner afterbody, realizes that charged enhancing, inertia interception, Blang spread the multiple effects such as seizure, electrostatic force reinforcement, migration distance shortening.This technology can strengthen deduster its to fine grain capture rate, but the problem of reentrainment of dust can't solve traditional electrical deduster deashing the time.To sum up, the overwhelming majority is improved original electric cleaner change very large, is difficult to promote.Therefore utilize existing equipment, the technology that improves electric precipitation capture fine particle draws attention day by day.
Summary of the invention
This patent is caught PM for the traditional electrical cleaner
2.5The problem that efficient is not high, the reentrainment of dust impact is serious provides a kind of wet convolution electrostatic precipitator and dust collection method done.
Of the present inventionly do the technical scheme that wet convolution electrostatic precipitator adopts and be, adopt existing electric cleaner, its inside comprises multistage electric field, and the rear two-stage of electric field is transformed.The penultimate stage electric field of described deduster adopts the long prickle wire of angle steel, jaggies or fish bone well polar curve, strengthens the penultimate stage electric field to the charged effect of particle; The final stage electric field of deduster adopts the entelechy line, strengthens the operating voltage of final stage electric field, forms strong migration electric field, and reduces the impact of corona wind stream field; The combination of penultimate stage electric field and final stage electric field has promoted particle diameter in the particle of 0.1-1 μ m migration velocity and the mobility at the final stage electric field; Several final stage deashing water jets are set above the pole plate of final stage electric field, and the mode that water rinses pole plate replaces vibration dust-cleaning, and the particle of guaranteeing to be attached on pole plate all can be eliminated, and reduces the reentrainment of dust that originally caused because of rapping.
The pole plate of described final stage electric field adopts anti-corrosion electric conducting material or plating anti-corrosion layer, with the etching problem of avoiding the wet type deashing to bring.
The convolution electrostatic dust removing method that wets of doing of the present invention, be specially: flue gas enters deduster, and through front what electric field, in flue gas, most particles are captured; In the end in the two-stage electric field, in flue gas, particle is with PM
2.5In the majority, during through the penultimate stage electric field, charging particle can be strengthened, and moves to pole plate be hunted down in the strong migration electric field of final stage, improves efficiency of dust collection; During deashing, the mode that the final stage electric field adopts water to clean, and by regulating and controlling position and the flow velocity of final stage deashing water jet spout, make the water of ejection form moisture film at polar board surface, significantly reduce reentrainment of dust.
Described final stage electric field reduces probability and the number of times of electric field breakdown for adapting to the weak discharge electric field of wet type deashing, guarantees deduster stable operation.
In the wet type deashing process of described final stage electric field, by adding washing agent or being aided with the mechanical rapping cleaning dust mode to strengthen ash-removal effect.
This patent advantage compared with prior art is as follows:
(1) improve efficiency of dust collection, especially PM
2.5The classification capture rate.In the end the two-stage electric field according to the characteristics of its entrance flue dust, changes the configuration of polar curve, pole plate, realizes that front electric field strengthens the combination that charged, rear electric field strengthens migration, and makes every effort to promote into the migration of particle and adhesion by wet type deashing introducing thermophoretic forces, liquid bridge at last electric field.Be deposited on particle on pole plate and rushed by water and can reduce to greatest extent reentrainment of dust, thereby greatly improved deduster to PM under comprehensive function
2.5Removal efficiency;
(2) configuration of the polar curve pole plate of final stage electric field is regulated to the weak discharge electric field that adapts to the wet type deashing, reduces probability and the number of times of electric field breakdown, guarantees deduster stable operation.And by controlling layout and the cleaning cycle of (operating) water nozzle, guarantee that the upper of pole plate can not cover thicker grieshoch, and reduce the impact of the anti-corona of grieshoch, keep the equal uniform electric field between the polar curve pole plate.
(3) application prospect is good, and cost is low.Little to original traditional electrical deduster change, the transformation of polar curve, pole plate easily realizes, and in the end one-level is used wet dust removal, and the ash amount is few, and water consumption is few, and cleaning cycle is long.
Description of drawings
Fig. 1 is the overall structure schematic diagram of doing wet convolution electrostatic precipitator after improving.
Fig. 2 (a) and Fig. 2 (b) are respectively the structural representations of doing wet convolution electrostatic precipitator penultimate stage electric field and final stage electric field.
Fig. 3 is the partial structurtes schematic diagram of doing wet convolution electrostatic precipitator final stage electric field.
Fig. 4 is the front view of Fig. 3.
Number in the figure:
1-deduster smoke inlet, 2-penultimate stage electric field, 3-final stage electric field, the outlet of 4-deduster, 5-ash bucket, 6-penultimate stage electric field polar curve, 7-final stage deashing water jet, 8-final stage electric field polar curve, 9-pole plate.
The specific embodiment
The invention provides a kind of wet convolution electrostatic precipitator and dust collection method done, the present invention will be further described below in conjunction with the drawings and specific embodiments.
The general arrangement that adopts four electric fields in the conventional electrostatic deduster, through front two-stage electric field, the above bulky grain of most of 10 μ m is all caught by pole plate, and in flue gas, remaining ash amount is below 10% of total ash amount, and is wherein in the majority with the fine grained of particle diameter below 2.5 μ m.
The overall structure of dried wet convolution electrostatic precipitator of the present invention as shown in Figure 1.This deduster adopts existing electric cleaner, comprise deduster smoke inlet 1, deduster outlet 4, ash bucket 5 and a plurality of pole plate 9, keep traditional electrical except the design of the anterior electric field of device, thereby realize the removing of large-size particles in flue gas, and the rear two-stage of electric field is transformed.The penultimate stage electric field 2 of deduster adopts the long prickle wire of angle steel, jaggies or fish bone well polar curve, strengthens the penultimate stage electric field to the charged effect of particle, as shown in Fig. 2 (a); The discharge effect such as the final stage electric field 3 employing entelechy lines of deduster are relatively poor, the uniform polar curve of electric field, strengthen the operating voltage of final stage electric field, form strong migration electric field, and the impact of minimizing corona wind stream field; The combination of penultimate stage electric field 2 and final stage electric field 3 has promoted particle diameter in the particle of 0.1-1 μ m migration velocity and the mobility at the final stage electric field; Several final stage deashing water jets 7 are set above the pole plate of final stage electric field 3, the mode that water rinses pole plate replaces vibration dust-cleaning, the particle of guaranteeing to be attached on pole plate all can be eliminated, and reduces the reentrainment of dust that originally caused because of rapping, as Fig. 2 (b), Fig. 3 and shown in Figure 4; And pole plate can adhere to the lower liquid film of one deck temperature rinsing the rear surface, is conducive to by thermophoretic forces, liquid bridge power etc., particle is attached on pole plate.The pole plate of final stage electric field 3 adopts anti-corrosion electric conducting material or plating anti-corrosion layer, with the etching problem of avoiding the wet type deashing to bring, guarantees the electric cleaner normal operation.
In running, due to PM
2.5Proportion in total ash amount is very little, so the cycle of final stage deashing is very long, and water consumption is few.In addition, the highfield that final stage entelechy line forms is more even, can reduce the probability of final stage wet scrubber electric field breakdown, ensures its long-term normal operation.Realize doing the high-efficiency and economic operation of wet convolution electrostatic precipitator.Final captive ash is collected in ash bucket 5, and Purge gas is flowed out by deduster outlet 4.
In course of normal operation, it is to PM
2.5The mechanism of removing of mainly catching be:
(1) in the penultimate stage electric field, by the configuration of change polar curve, pole plate, the enhanced discharge effect, in room for promotion, the concentration of free ion, make PM
2.5Easier in charged, thus be conducive to catch in electric field;
(2) in the final stage electric field, the configuration of polar curve pole plate is become to be beneficial to form uniform and stable strong migration electric field, weaken discharge effect, reduce the airborne dust that turbulent flow that corona wind causes is brought, particle easily is hunted down and fugacity not;
(3) in deashing process, the pole plate of final stage electric field can be avoided the rapping pole plate in the mode of washing, the ash bucket that is deposited on pole plate can be collected, thereby significantly reduce reentrainment of dust.And can add washing agent in cleaning fluid according to the ash particle different in kind, guarantee that particle can be eliminated;
(4) the even low discharge of final stage electric field selection moves by force electric field, can reduce the probability of the generation punch-through in wet flue gas, guarantees deduster stable operation;
(5) the final stage electric field uses the wet type deashing that most dusts are eliminated, and reduces the generation of anti-corona, thereby guarantees the stable of highfield between polar curve, pole plate;
(6) in the final stage electric field, pole plate uses the alternative stainless steels of corrosion resistant conductive material such as carbon fiber, or at polar board surface plating anti-corrosion layer, promotes the corrosion resistance of pole plate, guarantees normally operation;
(7) in the final stage electric field, the pole plate that rinsed through water can form on the surface the lower moisture film of one deck temperature, and the particle in flue gas can drive into wooden partition under the effect of thermophoretic forces, and is attached to polar board surface by fluid bridge power, strengthens capture effect;
Wherein, above-mentioned mechanism (1) and (2) have strengthened deduster and caught PM under many couplings according to the characteristics of final stage electric field entrance flue dust
2.5Ability, mechanism (3) guarantees that by the wet type deashing captive particle the reentrainment of dust phenomenon can not occur, mechanism (4), (5) and (6) cooperatively interact polar curve pole plate form and wet type purge mode, assurance equipment stable and high effective operation, mechanism (7) is introduced thermophoretic forces and is promoted that particle drives into motion to pole plate, and stick to wooden partition at polar board surface by fluid bridge power, strengthen capture effect.
Claims (5)
1. do wet convolution electrostatic precipitator for one kind, inside comprises multistage electric field, it is characterized in that, the penultimate stage electric field of described deduster adopts the long prickle wire of angle steel, jaggies or fish bone well polar curve, strengthens the penultimate stage electric field to the charged effect of particle; The final stage electric field of deduster adopts the entelechy line, strengthens the operating voltage of final stage electric field, forms strong migration electric field, and reduces the impact of corona wind stream field; The combination of penultimate stage electric field and final stage electric field has promoted particle diameter in the particle of 0.1-1 μ m migration velocity and the mobility at the final stage electric field; Several final stage deashing water jets are set above the pole plate of final stage electric field, and the mode that water rinses pole plate replaces vibration dust-cleaning, and the particle of guaranteeing to be attached on pole plate all can be eliminated, and reduces the reentrainment of dust that originally caused because of rapping.
2. a kind of wet convolution electrostatic precipitator of doing according to claim 1, is characterized in that, the pole plate of described final stage electric field adopts anti-corrosion electric conducting material or plating anti-corrosion layer, with the etching problem of avoiding the wet type deashing to bring.
3. the convolution electrostatic dust removing method that wets of doing based on deduster claimed in claim 1, is characterized in that, flue gas enters deduster, and through front what electric field, in flue gas, most particles are captured; In the end in the two-stage electric field, in flue gas, particle is with PM
2.5In the majority, during through the penultimate stage electric field, charging particle can be strengthened, and moves to pole plate be hunted down in the strong migration electric field of final stage, improves efficiency of dust collection; During deashing, the mode that the final stage electric field adopts water to clean, and by regulating and controlling position and the flow velocity of final stage deashing water jet spout, make the water of ejection form moisture film at polar board surface, significantly reduce reentrainment of dust.
4. a kind of wet convolution electrostatic dust removing method of doing according to claim 3, it is characterized in that: described final stage electric field reduces probability and the number of times of electric field breakdown for adapting to the weak discharge electric field of wet type deashing, guarantees deduster stable operation.
5. a kind of wet convolution electrostatic dust removing method of doing according to claim 3, is characterized in that: in the wet type deashing process of described final stage electric field, by adding washing agent or being aided with the mechanical rapping cleaning dust mode to strengthen ash-removal effect.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190540A (en) * | 2014-08-15 | 2014-12-10 | 浙江诸暨利达环保设备有限公司 | Dry-wet mixed electric precipitation device |
| CN104722401A (en) * | 2015-01-09 | 2015-06-24 | 李连清 | Vehicle-mounted haze eliminator |
| CN105689132A (en) * | 2016-03-11 | 2016-06-22 | 浙江信雅达环保工程有限公司 | Dry-wet compound electric dust remover |
| CN107743420A (en) * | 2015-06-29 | 2018-02-27 | 韩国电力公社 | Flyash separates and retracting device |
| CN109647117A (en) * | 2019-02-26 | 2019-04-19 | 北京合壹北科环保科技有限公司 | A kind of flue gas refined dedusting device with dehydrating function |
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| CN2562880Y (en) * | 2002-07-17 | 2003-07-30 | 中国人民解放军昆明陆军学院 | Integrated air purifier for high voltage electric field and dust collection |
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| JP2003010733A (en) * | 2001-06-29 | 2003-01-14 | Kawasaki Steel Corp | Polar plate for flat plate type electrostatic precipitator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104190540A (en) * | 2014-08-15 | 2014-12-10 | 浙江诸暨利达环保设备有限公司 | Dry-wet mixed electric precipitation device |
| CN104722401A (en) * | 2015-01-09 | 2015-06-24 | 李连清 | Vehicle-mounted haze eliminator |
| CN107743420A (en) * | 2015-06-29 | 2018-02-27 | 韩国电力公社 | Flyash separates and retracting device |
| CN105689132A (en) * | 2016-03-11 | 2016-06-22 | 浙江信雅达环保工程有限公司 | Dry-wet compound electric dust remover |
| CN109647117A (en) * | 2019-02-26 | 2019-04-19 | 北京合壹北科环保科技有限公司 | A kind of flue gas refined dedusting device with dehydrating function |
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| CN103128001B (en) | 2015-04-15 |
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