CN101745284B - Ultrasonic atomizing bag type dust removing device and dust removing method - Google Patents
Ultrasonic atomizing bag type dust removing device and dust removing method Download PDFInfo
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- CN101745284B CN101745284B CN 201010100710 CN201010100710A CN101745284B CN 101745284 B CN101745284 B CN 101745284B CN 201010100710 CN201010100710 CN 201010100710 CN 201010100710 A CN201010100710 A CN 201010100710A CN 101745284 B CN101745284 B CN 101745284B
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Abstract
The invention provides an ultrasonic atomizing bag type dust removing device and a dust removing method. The ultrasonic atomizing bag type dust removing device mainly comprises a deduster, and is characterized in that: the lower part of the bag type deduster is provided with a plurality of fog inlets which are connected with an ultrasonic atomizer respectively; and a flow valve is arranged on each fog inlet connecting pipe. By utilizing the ultrasonic atomizing bag type dust removing device, superfine fog drops are injected into the deduster in the process of dust removal to obtain moist filter cakes with large voidage; the moist filter cakes are easy to shed, and can avoid secondary dust-raising phenomenon; the cakes with the large voidage can reduce the running resistance of filtering effectively, and is favorable for saving energy sources. The removing device and the dust removing method have the advantages of capability of reducing energy consumption in the filtering process, less water consumption, simple dust subsequent treatment process and convenient dust recovery, no secondary dust raising, reduction in running resistance in the filtering process, and improvement on trapping performance of filter materials.
Description
Technical field:
The present invention relates to a kind of ultrasonic atomizing bag type dust arrester and dust collection method, belong to environmental protection and analysis field.
Background technology:
Atmosphere pollution is to affect one of key factor of China's environment, and wherein dust pollution is the pith of atmosphere pollution.Dust is very large to the harm of human body in the atmosphere, and grain diameter is less, and is larger to the harm of human body.Studies show that the floating dust of diameter 10 μ m can deposit in lung's tracheae, cause bronchus to stop up, affect the eupnea motion of human body.Therefore, the control dust pollution question, the discharging of particularly controlling fine dust has great importance.
In recent years, China has strengthened the dynamics of environmental protection, and the dust emission problem has obtained certain control, but for the minuteness particle to the human health damage maximum, owing to the characteristics such as its volume is little, lightweight have been brought very large difficulty to removing.At present, industrial dust arrester commonly used has cyclone dust collectors, electrostatic precipitator, sack cleaner etc.
Document 1: Zhang Youzhong, cement grinding mill bag dust collector existing problems and improvement, [J] cement, 2002,1:29-30.The exhaust dust device with bag of mentioning in the literary composition is divided into blowback system, filtration system and dust removing system 3 parts.Exhaust dust device with bag figure is version commonly used in the sack cleaner in the document.
Document 2: Xu Jian, Shen Henggen etc. improve the method that cyclone duster structure improves efficiency of dust collection, [J] industry security and environmental protection, 2003,29 (1): 3-5.Result of study shows: the cyclone dust collectors filtration resistance is larger; Efficiency of dust collection is lower, and is particularly lower for subparticle efficient, and to PM
10The efficiency of dust collection of (inhalable particles) is along with particle diameter reduces to reduce gradually;
Document 3: Sun Guangmin, Li Peisong etc., the research of XJF type cyclone dust collectors, [J] industry security and environmental protection, 2001,27 (11): 8-11.Dust removal efficiency in cyclone cleaner is lower, and is particularly lower for subparticle efficient.Herein with coal dust as simulating dust, the average dust removal efficiency of XJF type cyclone dust collectors is 92%, particle size range is 5～10 microns particle, its classification efficiency only is 50～65%, and is 0～5 micron particles for particle diameter, its classification efficiency only is 30～50%;
Document 4: Duan Shuai affects main cause and the countermeasure of electrostatic precipitator, national STEELMAKING PRODUCTION technical conference in 2008 and ironmaking annual meeting, 2008.Electrostatic precipitator generally is to utilize negative direct current high voltage to make the gas electricity produce corona discharge, and then makes dust charged, and in highfield, with dust, the dust arrester of separating from gas is characterized in that drag losses is little, all be 49-196Pa generally, energy consumption is less; Efficiency of dust collection is high, and generally more than 99%, design efficiency reaches as high as 99.99%; It is better that flue gas concentration is changed adaptability; But the electric precipitation range of application is subjected to the restriction of dust specific resistance, and the ratio resistance of dust is outside normal range (NR) the time, and efficiency of dust collection obviously reduces, can not qualified discharge, and easily cause the bad phenomenon such as reentrainment of dust;
Document 5: Wang Geng, Shi Bingjie, Zhang Weidong etc., the eptfe membrane filtrate is in the research of bag-type dusting efficiency of dust collection wherein, [J] engineering and technology, 2004. studies show that the sack cleaner take expanded PTFE as filtrate the capture of subparticle is had preferably effect, efficiency of dust collection is stable to reach 99.999%.But because sack cleaner belongs to filtration dust catcher, filtration resistance is larger.
Can find out in the above-mentioned document that in the various dust arresters, sack cleaner has the impact of dust characteristics such as not being subjected to smoke components, dust content, particle size range, efficiency of dust collection is high, and can efficiently capture fine dust, simple to operate, can qualified discharge etc. advantage.But sack cleaner is compared with other dust arresters, and running resistance is too high, easily causes reentrainment of dust, and ash discharge difficulty etc. is seriously restricting sack cleaner and using widely industrial.Therefore, provide a kind of novel method to strengthen its dust removal performance, have important economy and environment meaning to widening bag type dust removing technology.
Summary of the invention:
The purpose of this invention is to provide a kind of ultrasonic atomizing bag type deduster and dust collection method, is a kind of gas-solid separating method of novel high-efficiency and energy-saving.
Ultrasonic atomizing bag type deduster provided by the invention and dust collection method are according to principles such as cloud physics, dynamics, change the interaction force between dust granules, the surface viscosity of dust is changed, and increased droplet and become oarse-grained probability with the dust coalescence, thereby changed the deposition properties of dust, the porosity of filter cake has been increased, and then greatly reduce filtration resistance, reduce energy consumption, improved simultaneously the arresting efficiency to fine dust.In addition, formed filter cake is hygrometric state, is convenient to subsequent treatment.
Ultrasonic atomizing bag type dust arrester of the present invention as shown in Figure 1, its critical piece is deduster (1), wherein filter bag (2) is fixed on deduster inside, the deduster bottom has a dusty gas air inlet (3) to be connected with dust sucting pipeline through flow valve (11), deduster top is provided with air outlet (6) and is connected with air-introduced machine (10), the deduster outside is provided with differential manometer (9), two tie points of differential manometer are separately positioned on filter bag upstream side and downstream; Technical characteristics of the present invention is, is provided with a plurality of fog inlets (4) in the deduster bottom and is connected with ultrasonic ultrasonic delay line memory (7) respectively, and a flow valve (8) is housed on each fog inlet tube connector.
The quantity of deduster bottom fog inlet is made as 2-8 according to the volume of deduster, and better is 3-6.
The material of described filter bag is needled mat, nonwoven or coated filter material, and wherein coated filter material needs to support, and its backing material is nonwoven, Nomex or glass fibre etc.The below introduces the dust collection method of ultrasonic atomizing bag type deduster according to Fig. 1: open air-introduced machine (10), dusty gas enters into sack cleaner (1) from air inlet (3), by adjusting flow valve (11) controlled filter speed at 0.5～8m/min, simultaneously, open supersonic atomizer (7), the fine fog that produces is sent in the deduster by each fog inlet (4), control into the mist amount by the adjust flux valve, make atomizing concentration arrival 0.5～20g/m in the deduster
3And make the ratio of atomizing concentration and dust concentration, namely the mist powder is than being 0.5-1.5: 1; Fine mist is fully mixed with dust and the coalescence effect is occured in deduster, is then held back by filtrate, forms filter cake on the surface of filter bag (2), and clean gas passes filtrate and discharges dust pelletizing system by air outlet (6), thereby realizes gas solid separation.In said process, when resistance of filter cake reaches industrial capping (being generally less than 1500Pa), by backwashing system, make filter cake and filtrate peel off, be deposited to the dust arrester bottom, and discharge dust arrester by powder outlet (5).
The method is applicable to particle diameter less than 300 microns polydispersion or monodisperse particles.
The invention has the beneficial effects as follows:
1. this deduster is because the effect of fine fog, makes that filtration resistance diminishes in the capture process, filter Energy Intensity Reduction, and each blowback prolongs blanking time.So this sack cleaner energy efficient.
2. the dust subsequent treatment is simple.Because filter cake is hygrometric state, is easy to come off with filtrate, and is difficult for causing reentrainment of dust, need not the operation of follow-up dust suppression.Therefore this sack cleaner has been simplified operation.
Description of drawings
Fig. 1 is ultrasonic atomizing bag type deduster schematic diagram: wherein each symbolic representation: (1) sack cleaner; (2) filter bag; (3) dusty gas air inlet; (4) fog inlet; (5) powder outlet; (6) air outlet; (7) ultrasonic ultrasonic delay line memory (8) advances the mist flow valve; (9) differential manometer; (10) air-introduced machine; (11) air intake flow valve.
Fig. 2 is that embodiment 1 filters pressure drop temporal evolution figure;
Fig. 3 is that embodiment 2 filters pressure drop temporal evolution figure;
Fig. 4 is that embodiment 3 filters pressure drop temporal evolution figure;
Fig. 5 is that embodiment 4 crosses pressure drop temporal evolution figure.
The specific embodiment
Take polyfluortetraethylefilm film coated as filter pocket material, glass fibre is backing material, and the film average pore size is 0.47 μ m, and porosity is 87.6%; Stand-by dust is 2500 purpose talcum powder, and dust concentration is 10.5g/m
3
Open air-introduced machine (10), dusty gas enters into sack cleaner (1) from air inlet (3).By adjust flux valve (11) controlled filter speed at 6.4m/min.Simultaneously, open supersonic atomizing humidifier (7), the fine fog that produces is sent in the deduster by each fog inlet (4).Control into the mist amount by the adjust flux valve, make atomizing concentration arrival 10.5g/m in the deduster
3, at this moment, mist powder ratio is 1: 1.Filter pressure drop by differential manometer (9) metering.To filter pressure drop temporal evolution figure and be plotted in Fig. 2.
Under similarity condition, not adding the mist dust removal operation (is that atomizing concentration is 0g/m in the deduster
3), it is filtered pressure drop temporal evolution figure be plotted in Fig. 2 and add mist and filter and compare.
As seen from Figure 2, more not during humidification, mist powder ratio is 1: 1 o'clock, the filtration pressure drop of identical filtration time obviously descends, and can know by inference, and humidification is not more during humidification, reaching the identical needed time of filtration pressure drop increases greatly, each filtration time is prolonged, reduced the backwash number of times, be conducive to energy-conservation.In addition, because humidification, filter cake is hygrometric state, thereby does not produce the reentrainment of dust phenomenon.
Experiment with dust and filtering material with embodiment 1.Dust concentration is 9.8g/m
3, atomizing concentration is 12.7g/m
3, mist powder ratio is 1.3: 1.Other operations are with embodiment 1.With humidification and not the filtration pressure drop temporal evolution figure of humidification be plotted in Fig. 3.
Can be obtained the identical conclusion of embodiment 1 by Fig. 3.
Experiment is 0.0177m/s (being 1m/min) with dust and filtering material with embodiment 1 rate of filtration, and dust concentration is 8.4g/m
3, atomizing concentration is 4.7g/m
3, mist powder ratio is 0.5: 1.Other operations are with embodiment 1.With humidification and not the filtration pressure drop temporal evolution figure of humidification be plotted in Fig. 4.
Can be obtained the identical conclusion of embodiment 1 by Fig. 4.
Experiment is 2500 order talcum powder with dust, and filtering material is nonwoven; Dust concentration is 14.5g/m
3, atomizing concentration is 7.2g/m
3, mist powder ratio is 0.7: 1.Other operating conditions are with embodiment 1.With humidification and not the filtration pressure drop temporal evolution figure of humidification be plotted in Fig. 5.
Can be obtained the identical conclusion of embodiment 1 by Fig. 5.
More than concrete example show that it is a kind of effective intensifying method to the method that fine dust captures performance that ultrasonic atomization is strengthened sack cleaner, but the strainability of Effective Raise filtrate.
Claims (5)
1. ultrasonic atomizing bag type dust arrester, its critical piece is deduster (1), wherein filter bag (2) is fixed on deduster inside, the deduster bottom has a dusty gas air inlet (3) to be connected with dust sucting pipeline through flow valve (11), deduster top is provided with air outlet (6) and is connected with air-introduced machine (10), the deduster outside is provided with differential manometer (9), and two tie points of differential manometer are separately positioned on filter bag upstream side and downstream; Its technical characteristics is, is provided with a plurality of fog inlets (4) in the deduster bottom and is connected with ultrasonic ultrasonic delay line memory (7) respectively, and a flow valve (8) is housed on each fog inlet tube connector.
2. ultrasonic atomizing bag type dust arrester according to claim 1, the quantity that it is characterized in that the deduster fog inlet are 2-8; The material of described filter bag is needled mat, nonwoven or coated filter material, and wherein the used backing material of coated filter material is nonwoven, Nomex or glass fibre.
3. ultrasonic atomizing bag type dust arrester according to claim 1, the quantity that it is characterized in that the deduster fog inlet are 3-6.
4. method that adopts ultrasonic atomizing bag type dust arrester as claimed in claim 1 dedusting, its concrete steps are: open air-introduced machine (10), dusty gas enters into sack cleaner (1) from air inlet (3), by adjusting flow valve (11) controlled filter speed at 0.5～8m/min, simultaneously, open ultrasonic ultrasonic delay line memory (7), the fine fog that produces is sent in the deduster by each fog inlet (4), control into the mist amount by the adjust flux valve, make atomizing concentration arrival 0.5～20g/m in the deduster
3And the ratio that makes atomizing concentration and bug dust concentration is 0.5-1.5: 1; Fine mist is fully mixed with dust and the coalescence effect is occured in deduster, is then held back by filtrate, forms filter cake on the surface of filter bag (2), and clean gas passes filtrate and discharges dust pelletizing system by air outlet (6), thereby realizes gas solid separation;
When resistance of filter cake reaches industrial capping, by backwashing system, make filter cake and filtrate peel off, be deposited to the dust arrester bottom, and discharge dust arrester by powder outlet (5).
5. the dust collection method of ultrasonic atomizing bag type dust arrester according to claim 4, the method are applicable to particle diameter less than 300 microns polydispersion or monodisperse particles.
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| CN 201010100710 CN101745284B (en) | 2010-01-25 | 2010-01-25 | Ultrasonic atomizing bag type dust removing device and dust removing method |
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| CN101745284B true CN101745284B (en) | 2013-03-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101912705B (en) * | 2010-09-03 | 2012-06-06 | 北京化工大学 | Method for fixing filter cake in bag type dust collector |
| CN101985077B (en) * | 2010-11-11 | 2012-07-25 | 周建安 | Dedusting method of bag type dust collector |
| CN102380275A (en) * | 2011-08-26 | 2012-03-21 | 兰州大学 | Dedusting device and dedusting method therefor |
| SE541827C2 (en) * | 2017-05-02 | 2019-12-27 | Husqvarna Ab | Valve, use of such valve, separator comprising such valve and method of operating a separator |
| SE542082C2 (en) * | 2017-05-02 | 2020-02-18 | Husqvarna Ab | Valve, use of such valve, separator comprising such valve and method of cleaning a separator body |
| CN108619896B (en) * | 2018-05-16 | 2023-11-21 | 安徽建筑大学 | CO based on switching type packed bed reactor 2 Circulation removing device and method |
| CN111473448B (en) * | 2020-03-31 | 2021-10-22 | 宁波方太厨具有限公司 | New fan and method for reducing resistance of filter screen |
| CN111871139A (en) * | 2020-08-09 | 2020-11-03 | 盐城工学院 | Rhombus superfine particle coalescence box |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2290390Y (en) * | 1997-05-19 | 1998-09-09 | 冶金工业部马鞍山矿山研究院 | Ultrasonic atomizing cyclone duster |
| CN1524629A (en) * | 2003-09-14 | 2004-09-01 | 周俊宇 | Method of ultrasonic atomized water participated in filtration in cleaner |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2290390Y (en) * | 1997-05-19 | 1998-09-09 | 冶金工业部马鞍山矿山研究院 | Ultrasonic atomizing cyclone duster |
| CN1524629A (en) * | 2003-09-14 | 2004-09-01 | 周俊宇 | Method of ultrasonic atomized water participated in filtration in cleaner |
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