CN103418491A - Method for improving efficiency of electric deduster for removing particulate matter 2.5 (PM2.5) dust in flue gas - Google Patents
Method for improving efficiency of electric deduster for removing particulate matter 2.5 (PM2.5) dust in flue gas Download PDFInfo
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- CN103418491A CN103418491A CN201210151126XA CN201210151126A CN103418491A CN 103418491 A CN103418491 A CN 103418491A CN 201210151126X A CN201210151126X A CN 201210151126XA CN 201210151126 A CN201210151126 A CN 201210151126A CN 103418491 A CN103418491 A CN 103418491A
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Abstract
The invention relates to the environmental protection technology field of flue gas, and particularly relates to a method for improving efficiency of an electric deduster for removing particulate matter 2.5 (PM2.5) dust in the flue gas. The flue gas is pretreated before entering the electric deduster, and a treatment method of coupling ultrasonic reunion by water vapor spraying is used for pretreatment; further the water vapor can be sprayed by cis-spraying, reverse spraying or sprayed with a certain angle with the flow direction of the flue gas, the spraying quantity of the water vapor is designed to be 0.02-0.1 kg/m<3>, and the temperature of the water vapor is 100-150 DEG C; and further while the water vapor is sprayed into the flue gas, the flue gas is also treated by ultrasonic, the ultrasonic frequency is selected to be 20 kHZ-30 kHZ, and the ultrasonic power is selected to be 80 W-400 W. After the pretreatment of the flue gas, the highest removal efficiency of the PM2.5 can reach above 99%.
Description
Technical field
What the present invention relates to is the fume environment protection technical field, is specially a kind of raising electric cleaner to PM2.5 dust removal efficiency method in flue gas.
Background technology
Ultra-fine grain PM2.5 is mainly derived from the human activities such as fuel combustion, burning of as coalescent as the condensation of metallic vapour in the discharge of the burning of energy industrial department coal, motor-vehicle tail-gas, metal smelt process, resident living cooking stove etc.Coal take in China's energy resource structure as main, and coal burning has accounted for more than 70% of primary energy, and the discharge of the superfine particulate matter that coal burning causes is important pollution sources.
According to the relevant industries statistical report, show, the dust emission total amount of current China has surpassed 1,000 ten thousand tons, and only the discharge capacity in power industry every year has just reached 3,600,000 tons, accounts for total release 35% left and right.Within 2009, national industrial smoke discharge capacity is 43.61 tcms, within 2010, is 47.52 tcms.The flue dust particle diameter of discharge is distributed in below PM10 substantially, and the overwhelming majority is distributed in below PM2.5, forms comparatively stable aerosol in atmosphere.PM2.5 has become one of main component of China's atmospheric aerosol.
In large-scale coal-fired flue-gas dust Control, the quantity of electric cleaner accounts for 75% of the domestic coal-fired flue-gas total market size at present.Electric cleaner efficiency of dust collection under accidental conditions is high, but for ultrafine dust PM2.5, has at least particle more than 15% can leave electric cleaner and enters atmosphere.Strict (30mg/m3) gradually along with the atmospheric dust discharge standard, the efficiency of dust collection of electric cleaner faces new challenges, its main cause comprises the following aspects: the distribution of sizes of the dust granules that (1) coal produces in combustion process is very wide, contained molecule from sub-micron to the grade particulate that is easy to sedimentation, deduster is increased the control difficulty of various particle diameter dust; (2) high specific resistance of low-sulfur coal (desulfurization needs) or recirculating fluidized bed flying dust etc., make its anti-corona serious, and particularly the charged efficiency of ultrafine dust PM2.5 is low, and efficiency of dust collection is reduced; (3) variation of China's fire coal species is various, and boiler load fluctuation in actual motion is larger, must cause electric cleaner to increase the adaptability difficulty of exhaust gas volumn; (4) conventional dry electric precipitation device is cleared up the dust on dust collecting electrode by purge modes such as rapping, sound waves, in deashing process, some dust be collected into can return to air-flow, and the electric cleaner of finally overflowing causes dust emission concentration to increase.There are some researches show, in the dust of conventional dry electric precipitation device outlet, approximately have 20% to be that reentrainment of dust in deashing process causes.The dust size of PM2.5 is little, quality is light, and therefore conventional dry electric precipitation device is charged insufficient to it, and easily causes reentrainment of dust when rapping.
At present, the method that improves ESP Efficiency is a lot, comprise the condition of power supply that improves electric cleaner, providing high-intensity corona field to force particle charged is a kind of method, can be by increasing the dust-precipitator volume, increasing distance between plates or realize by pulse voltage; Also can adopt pre-charged method, the particle after charged by intergranular inertial collision, particle diffusion, space-charge force, intergranular heteropolarity attract, between particle or particle and the interaction force of wall make the minuteness particle coalescence become thicker particle to be removed afterwards.
Recent research shows, the coalescence and the reunion that utilize the phase transformation coalescence technology of water vapour can improve dust.The phase transformation coalescence technology of water vapour is that to utilize supersaturated vapor to condense in the coring on fine particle surface be the important measures that impel fine particle to grow up and remove.And water vapour add the water capacity that also can increase the dust surface, reduce the ratio resistance of dust.
Acoustic agglomeration is according to Principles of Acoustics, utilizes and has the very sound area of high-energy-density, and superfine particulate matter is reunited.In 18 end of the centurys, sound field is carried under one's arms after the theory of particulate is suggested, and a lot of scholar's vibrations in sound field to particle, reuniting is studied, and aspect the setting up of Agglomeration Mechanism and theoretical model, has also carried out a large amount of work.Theoretical research shows, frequency of sound wave one timing, and the sound intensity is little to the acoustic agglomeration effectiveness affects.And certain when the sound intensity, acoustic agglomeration efficiency increases along with the increase of frequency of sound wave.But due to limitation of acoustic agglomeration the complex nature of the problem, experiment condition difference and method of testing etc., make up to now, the view of also not agreeing on some critical problems, the conclusion even had is also conflicting, causes this technology still under test.
Summary of the invention
Thereby the object of the invention is to provide a kind of raising electric cleaner PM2.5 dust removal efficiency method in flue gas is solved to problems of the prior art,
Technical solution of the present invention is, a kind of raising electric cleaner is to PM2.5 dust removal efficiency method in flue gas, for the flue gas entered before electric cleaner, carries out pretreatment, and pretreatment adopts water vapour to spray lotus root and closes the method that ultrasonic wave is reunited and processed.
Further water vapour sprays and can adopt along spray, contrary spray or the angle certain with the flue gas flow direction journey, and the straying quatity of water vapour is designed to 0.02～0.1kg/m3, and the temperature of water vapour is 100～150 ℃.
When further in flue gas, spraying into water vapour, also adopt the ultrasonic wave smoke treatment, hyperacoustic frequency is chosen as 20kHZ～30kHZ, and hyperacoustic power is 80W～400W.
Advantage of the present invention is: dust in water vapour and flue gas, the particularly interaction of PM2.5, part capillary pressure or be condensate in the dust surface, the water capacity of dust is increased, it also will descend than resistance, the most important thing is that in flue gas, advantage has been created in the collision that increases to dust and the reunion of water vapour.In this process, ultrasonic wave is had an effect to PM2.5, water vapour etc. simultaneously, and the coalescence of dust and reunion are strengthened.The increase of dust granules particle diameter after reuniting, and the increase of dust surface water capacity, these dust charged process in entering electric cleaner becomes and is more prone to, reentrainment of dust in electric cleaner also greatly reduces, thereby improved the removal efficiency of whole system to dust, particularly the efficiency of dust collection of PM2.5 improved greatly.Flue gas is after pretreatment, and the highest removal efficiency of PM2.5 can reach more than 99%.
Below in conjunction with the specific embodiment and embodiment, the present invention is described in detail:
A kind of raising electric cleaner is to PM2.5 dust removal efficiency method in flue gas, for the flue gas entered before electric cleaner, carries out pretreatment, and pretreatment adopts water vapour to spray lotus root and closes the method that ultrasonic wave is reunited and processed.
Further water vapour sprays and can adopt along spray, contrary spray or the angle certain with the flue gas flow direction journey, and the straying quatity of water vapour is designed to 0.02～0.1kg/m3, and the temperature of water vapour is 100～150 ℃.
When further in flue gas, spraying into water vapour, also adopt the ultrasonic wave smoke treatment, hyperacoustic frequency is chosen as 20kHZ～30kHZ, and hyperacoustic power is 80W～400W.
Embodiment 1:
The straying quatity of water vapour is designed to 0.1kg/m3, and the temperature of water vapour is 100 ℃, adopts contrary spirt to enter; Hyperacoustic frequency is chosen as 30kHZ, and hyperacoustic power is 400W.Flue gas is after pretreatment, and after entering electric cleaner, the highest removal efficiency of PM2.5 is more than 99%.
Embodiment 2:
The straying quatity of water vapour is designed to 0.02kg/m3, and the temperature of water vapour is 150 ℃, adopts along spirt; Hyperacoustic frequency is chosen as 20kHZ, and hyperacoustic power is 80W.Flue gas is after pretreatment, and after entering electric cleaner, the highest removal efficiency of PM2.5 can reach more than 95%.
Embodiment 3:
The straying quatity of water vapour is designed to 0.06kg/m3, and the temperature of water vapour is 120 ℃, adopts reverse oblique spray (30 degree angle) to enter; Hyperacoustic frequency is chosen as 25kHZ, and hyperacoustic power is 200W.Flue gas is after pretreatment, and after entering electric cleaner, the highest removal efficiency of PM2.5 can reach more than 97%.
Claims (3)
1. a raising electric cleaner, to PM2.5 dust removal efficiency method in flue gas, is characterized in that, for the flue gas entered before electric cleaner, carries out pretreatment, and pretreatment adopts water vapour to spray lotus root and closes the method that ultrasonic wave is reunited and processed.
2. a kind of raising electric cleaner according to claim 1 is to PM2.5 dust removal efficiency method in flue gas, it is characterized in that, water vapour sprays and can adopt along spray, contrary spray or the angle certain with the flue gas flow direction journey, the straying quatity of water vapour is 0.02～0.1kg/m3, and the temperature of water vapour is 100～150 ℃.
3. a kind of raising electric cleaner according to claim 1 is to PM2.5 dust removal efficiency method in flue gas, it is characterized in that, when in flue gas, spraying into water vapour, also adopt the ultrasonic wave smoke treatment, hyperacoustic frequency is chosen as 20kHZ～30kHZ, and hyperacoustic power is 80W～400W.
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Cited By (8)
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| CN103736356A (en) * | 2014-01-09 | 2014-04-23 | 东南大学 | Device for removing fine particles by combining sound wave agglomeration and conventional dedusting |
| CN104190199A (en) * | 2014-09-02 | 2014-12-10 | 国家海洋局第三海洋研究所 | Device and method for removing fine particles by virtue of acoustic wave and phase change coupling effect |
| CN104258994A (en) * | 2014-05-29 | 2015-01-07 | 山东国舜建设集团有限公司 | Coagulation method and device of desulfurized wet flue gas tiny dust |
| CN104801420A (en) * | 2015-05-13 | 2015-07-29 | 东南大学 | Device and method for increasing grain size of PM2.5 (particulate matter2.5) through turbulent flow and chemical agglomeration coupling |
| CN107081217A (en) * | 2017-05-23 | 2017-08-22 | 东南大学 | A kind of Combustion Source PM2.5Minimum discharge method and integrated coupled system |
| CN111102602A (en) * | 2019-12-04 | 2020-05-05 | 重庆大学 | Flue device for reducing emission of fine particulate matters in flue gas of civil heating stove based on phase change agglomeration and wet dust removal |
| CN111151088A (en) * | 2020-01-17 | 2020-05-15 | 中国人民解放军国防科技大学 | Airport mist efficient elimination system and fog dispersal method thereof |
| CN114100858A (en) * | 2021-11-26 | 2022-03-01 | 云南铜业股份有限公司西南铜业分公司 | Method for modulating smelting flue gas based on electric precipitation device and application |
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| CN111102602A (en) * | 2019-12-04 | 2020-05-05 | 重庆大学 | Flue device for reducing emission of fine particulate matters in flue gas of civil heating stove based on phase change agglomeration and wet dust removal |
| CN111151088A (en) * | 2020-01-17 | 2020-05-15 | 中国人民解放军国防科技大学 | Airport mist efficient elimination system and fog dispersal method thereof |
| CN114100858A (en) * | 2021-11-26 | 2022-03-01 | 云南铜业股份有限公司西南铜业分公司 | Method for modulating smelting flue gas based on electric precipitation device and application |
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Application publication date: 20131204 |