CN107433115A - A kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system - Google Patents

A kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system Download PDF

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CN107433115A
CN107433115A CN201710835458.2A CN201710835458A CN107433115A CN 107433115 A CN107433115 A CN 107433115A CN 201710835458 A CN201710835458 A CN 201710835458A CN 107433115 A CN107433115 A CN 107433115A
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desulfurization
ultrasonic
flue gas
atomization
flue
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陈佐会
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
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    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
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    • B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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Abstract

A kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system, including：Flue gas flow guide system, ultrasonic atomizing system, demister system, water treatment system, medicine system and automatic control system；Flue gas passes through ultrasonic wave flue by water conservancy diversion, the compound alkali lye of circulation desulfurization after high-pressure pump voltage supply and ultrasonic equipment atomization by will form the uniform haze being made up of micron order fine mist in ultrasonic wave flue, haze is sufficient filling with ultrasonic wave flue, and stop through flue gas, SO2 is atomized desulfurizing agent and catches and react rapidly in flue gas；Ultrasonic wave is discharged by supersonic generator, the compound alkali lye of desulfurization is vibrated into the atomization gas less than 5 10 μm, surface tension is big, doctor solution has certain viscosity in itself, the dust in flue gas can effectively be caught, supersonic generator can effectively catch the ammonia of denitrating technique escape, and in the environment of ultrasonic oscillation atomization further with nitrogen oxides reduction reaction occurs for the ammonia for escape.

Description

A kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system
Technical field
The present invention relates to flue gas desulfurization technique, especially a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia one Body system.
Background technology
The existence form of sulphur has sulfide, sulfate and organic sulfur in coal.Coal in combustion, the sulphur of lower valency Compound, a part are direct oxidation into SO3, and form stable sulfate；Another part is then oxidized to SO2.This part SO2It is exhausted Most of alkaline materials and O that can again with high temperature2React generation sulfate.Remaining small part SO2Chimney can be entered Discharge.The sulfate of reaction generation mainly has the compounds such as potassium sulfate, sodium sulphate, calcium sulfate, the melting temperature of these compounds Respectively 1074 DEG C, 852 DEG C, 1397 DEG C, knot can be produced in stove tapering, necking, level Four cylinder and Pyatyi cylinder equitemperature appropriate site Skin, clogging, if there is reducing atmosphere, sulfate mineral regenerates SO under CO and C reduction2And dust, or temperature In the case that degree is more than 1500 DEG C, volatilization phenomenon occurs, participates in interior circulate.Relevant SO2And the control method of dust is from fuel The three phases human hand of life cycle, it is divided into before burning, in burning, after burning.Before burning, burning in desulfurization it is relatively difficult and into This is higher, and correlative study is less, and almost all of research is all concentrated after combustion to SO2And the control of dust.In industry, thermoelectricity The uniform main SO in factory, steel mill and cement plant2And dust pollution source, at present these pollution sources have corresponding control measure, Its desulfurization and dedusting technology is broadly divided into dry method, semidry method, wet method, but high using above method cost, and desulphurization and denitration and removes The effect of dirt is poor.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting and prevent the escaping of ammonia Integral system, desulfuration efficiency are high, and ultrasonic wave sulfur removal technology desulfurization degree is up to more than 99%, the not only titanium dioxide of the flue gas after desulfurization Sulphur concentration is very low, and dust content also greatly reduces, and effectively organizes the escape of ammonia.
In order to solve the above technical problems, the technical scheme is that：A kind of thermal power plant's ultrasonic atomization desulfurization and dedusting resistance Only the escaping of ammonia integral system, including：
Ultrasonic atomizing system, flue gas pass through water conservancy diversion by ultrasonic wave flue, the compound alkali lye of circulation desulfurization in ultrasonic wave flue By will form the uniform haze being made up of micron order fine mist after high-pressure pump voltage supply and ultrasonic equipment atomization, haze is abundant Fill ultrasonic wave flue, and stop through flue gas, SO2 is atomized desulfurizing agent and catches and react rapidly in flue gas；Pass through Supersonic generator discharges ultrasonic wave, and the compound alkali lye of desulfurization is vibrated into the atomization gas less than 5-10 μm, and surface tension is big, Doctor solution has certain viscosity in itself, can effectively catch the dust in flue gas, and supersonic generator can effectively catch denitration The ammonia of technique escape, and the ammonia for escape is further anti-with nitrogen oxides generation reduction in the environment of ultrasonic oscillation atomization Should；
Atomization system, flue gas after desulfurization temperature reduce, and smoke moisture is larger, will by the demisting reaction tower of built-in demisting packing layer Most dust and water smoke containing SO2 are retained down, and after desulfurization demisting, clean flue gas returns in the case where draining fan action To original flue simultaneously；
Caused waste liquid collects below range of atomization flue and led by orientation in water treatment system, ultrasonic system and deentrainment tower Stream is collected into regenerated reactor；The pulverized limestone that digestion is added in regenerated reactor is allowed to generate sulphur stone with the sulfuric acid reactant salt of desulfurization generation Cream, the follow-up flocculant that adds make the sulphur gypsum of generation and dust further flocculate into larger alumen ustum；Flocculated in regenerated reactor through regeneration Underflow liquid is extracted to concentrating and separating at hydrocyclone after processing, and limpid overflowing liquid is collected to circulation medicament pond and supplies ultrasonic system Use, cyclone bottom concentrate to vacuum filter dewater treatment, obtain block gypsum；
Medicine system, medicine system include water treatment dosing system and desulfurizing agent medicine system；Water treatment medicine is mainly lime Add slaking apparatus and PAC, PAM medicine dissolving tank three parts are formed, be responsible for adding water treatment agent to regenerated reactor；Desulfurizing agent dosing system System is counted comprising desulfurizing agent automatic adding device, catalyst automatic adding device and desulfurizing agent pond composition, PH built in desulfurization medicament pond Automatic medicament feeding machine dosing is controlled, desulphurization catalyst fills according to desulfurizing agent pond inflow automatic feeding, desulfurizing agent in desulfurizing agent pond After dividing dissolving mixing, it is supplemented to circulation medicament pond and is mixed with regenerated liquid, form circulating medical solution.
As an improvement, also including flue gas flow guide system, flue gas after electrostatic dust collection equipment through introducing ultrasonic atomizing system Middle carry out desulfurization process, is provided with shunting zone between induced duct and ultrasonic atomizing system, and flue gas is distinguished through water conservancy diversion uniform flux Into in each sub- flue of ultrasonic system.
As an improvement, flue gas passes through 20 meters of ultrasonic wave flues by water conservancy diversion with 3.47m/s flow velocitys.
As an improvement, regenerated reactor side is provided with accident emergency pond.
As an improvement, the water treatment dosing system also includes lime silo.
As an improvement, integral system also includes automatic control system, automatic control system is equipped with corresponding pressure sensing The monitoring devices such as device, PH detector and liquid level gauge and inlet and outlet smoke on-line monitoring system, are passed monitoring result by electric signal Central Control Room processor is transported to focus on.
As an improvement, the compound alkali lye of desulfurization is in percentage by weight, compound alkali lye forms including the following raw material：
Calcium chloride 8 ~ 25%
White clay 2 ~ 3%
Sodium hydroxide 4 ~ 8%
Barium monoxide 0.5 ~ 1.2%
Magnesium hydroxide 0.8 ~ 1%
Calcium hydroxide 5 ~ 10%
Green vitriol 9 ~ 16%
Lithium peroxide 7 ~ 9%
Potassium permanganate 5 ~ 10%
Water 15 ~ 25%
Lithium hydroxide 3 ~ 7%
Prodan 4 ~ 10%
Sodium carbonate 4 ~ 10%
Ethylene diamine phosphate 0.8 ~ 1.7%.
As an improvement, the electrostatic precipitator has four electrion electric fields, the first electric field is negative high voltage direct-current discharge Electric field, it is connected with smoke inlet pipelines, as pre- level of gathering dust；Second electric field and the 3rd electric field are positive high voltage pulsed discharge electricity , it is connected with the first DC electric field, as dust granules are charged and various pollutants of fume cooperation-removal level；4th electric field is negative HVDC discharge electric field, after the 3rd positive high voltage pulsed discharge electric field, gathered dust level as coalescence.
The caused compared with prior art beneficial effect of the present invention is：
（1）Desulfuration efficiency is high, and ultrasonic wave sulfur removal technology desulfurization degree is up to more than 99%, and not only sulfur dioxide is dense for the flue gas after desulfurization Degree is very low, and dust content also greatly reduces, and effectively organizes the escape of ammonia；
（2）Technology maturation, operational reliability is good, and the normal operation of equipment will not be influenceed because of desulphurization plant.Service life is grown, can Obtain good returns of investment；
（3）Desulfurizing byproduct is easy to comprehensively utilize, and the desulfurizing byproduct of ultrasonic atomization integrated technique is desulfurated plaster, in day Originally, German desulfurated plaster annual production is respectively 2,500,000 tons and 3,500,000 tons or so, and being substantially all to comprehensively utilize, and be mainly used for For producing building material product and cement retarder, desulfurizing byproduct comprehensive utilization, it can not only increase factory's benefit, reduce running cost With, and desulfurizing byproduct disposal costs can be reduced, extend lime plant service life；
（4）Cost of investment is low, short construction period.Ultrasonic atomization integrated technique capital equipment is integrated using modularization, scene Construction cost is low（The 70% of about traditional acid-base method）, a same Construction of Engineering Projects cycle constructs all less than traditional acid-base method The half of phase；
（5）Operation cost is low, and due to being integrated using modularization, project maintenance convenience and high-efficiency is cheap；Desulfurization medicament utilization rate is high, throws Dosage is few；Waste water whole recovery and reusing and recycling, without outer row；Polynary PLC port controllings technology, the project maintenance personnel are few；
（6）Compatibility is good, and ultrasonic atomization integrated technique can be attached to coal-burning power plant, cement plant, steel plant, coking well A variety of industries such as factory, adapt to different flue gas conditions, have splendid compatibility；
（7）Upgrading advantage, ultrasonic atomization integrated technique have great upgrading space, and ultra-clean discharge has popularization to become Gesture, traditional sulfur removal technology are difficult that upgrading is carried out in original system, and ultrasonic atomization integrated technique then can be in original equipment base Upgrade expanding is carried out on plinth and is expected with reaching new desulfurization, avoids overlapping investment.
Brief description of the drawings
Fig. 1 is present system frame diagram.
Fig. 2 is present system structural representation.
Embodiment
With reference to Figure of description, the invention will be further described.
As shown in Figure 1, 2, a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system, including：
Flue gas flow guide system, this sulfur removal technology are arranged at after electrostatic dust collection equipment, and flue gas is introduced into subsequent ultrasonic ripple atomization system Desulfurization process is carried out in system；Shunting zone is provided between induced duct and ultrasonic atomizing system, flue gas is through water conservancy diversion with more uniform stream Amount is respectively enterd in each sub- flue of ultrasonic system；The system can be overhauled and safeguarded simultaneously in the process of running, not influenceed Desulfuration efficiency.Emergent accident such as occur causes system shutdown, by electronic valve plate flue gas can be controlled to move towards, pass through flue gas standby Desulphurization system carries out processing discharge.
Ultrasonic atomizing system 1, flue gas passes through water conservancy diversion with 3.47m/s flow velocitys by 20 meters of ultrasonic wave flues 11, in ultrasound Circulation desulfurization liquid after high-pressure pump voltage supply and ultrasonic equipment atomization by that will form by micron order fine mist group in ripple flue 11 Into uniform haze, haze is sufficient filling with ultrasonic wave flue, and stop through flue gas, SO2 is atomized desulfurizing agent and caught in flue gas To catch and react rapidly, the hybrid reaction time is 5.76s, flue gas and the compound alkaline reaction ample time of desulfurization after atomization, Desulfuration efficiency is set to reach more than 99%.Ultrasonic wave is discharged by supersonic generator, by the compound alkali lye vibration of desulfurization into less than 5- 10 μm of atomization gas, surface tension is big, and the compound alkali lye of desulfurization has certain viscosity in itself, effectively can catch in flue gas Dust.In addition, supersonic generator can effectively catch the ammonia of denitrating technique escape, and cause the ammonia of escape in ultrasonic oscillation mist Reduction reaction further occurs with nitrogen oxides in the environment of change, the not only less escape of ammonia, also further functions as denitration Effect.
Atomization system 2, flue gas after desulfurization temperature reduce, and smoke moisture is larger, and the demisting by built-in demisting packing layer is anti- Tower is answered to be retained down most dust and water smoke containing SO2, after desulfurization demisting, clean flue gas is in drainage blower fan Original flue is returned under 3 effects and completes qualified discharge.
Caused waste liquid collects below range of atomization flue and by fixed in water treatment system, ultrasonic system and deentrainment tower Collected to water conservancy diversion into regenerated reactor 8, the side of regenerated reactor 8 is provided with accident emergency pond 9, and when emergency case, water is abnormal or shuts down inspection When repairing, stay with standby；The pulverized limestone that digestion is added in regenerated reactor 8 is allowed to generate sulphur stone with the sulfuric acid reactant salt of desulfurization generation Cream, the follow-up flocculant that adds make the sulphur gypsum of generation and dust further flocculate into larger alumen ustum；Flocculated in regenerated reactor 8 through regeneration Underflow liquid is extracted to concentrating and separating at hydrocyclone 5 after processing, and limpid overflowing liquid is collected to circulation medicament pond 7 and supplies ultrasonic wave system System 1 uses, and the bottom concentrate of hydrocyclone 5 to the dewater treatment of vacuum filter 6, obtains block gypsum, can Building wood the most Material recycles.
Medicine system, medicine system mainly include water treatment dosing system and the compound alkali lye medicine system two parts of desulfurization： Water treatment medicine is mainly that Lime-Injecting slaking apparatus and PAC, PAM medicine dissolving tank three parts are formed, and is responsible for adding water to regenerated reactor Treatment agent, because the system lime consumption amount is larger, therefore have corresponding lime storage 4；The compound alkali lye medicine system of desulfurization includes The compound alkali lye automatic adding device of desulfurization, catalyst automatic adding device and the compound alkali lye pond of desulfurization form, in desulfurization medicament pond PH meter control automatic medicament feeding machine dosings are put, desulphurization catalyst is compound according to the compound alkali lye pond inflow automatic feeding of desulfurization, desulfurization After alkali lye fully dissolves mixing in the compound alkali lye pond of desulfurization, it is supplemented to circulation medicament pond and is mixed with regenerated liquid, form circulation medicine Liquid.
Automatic control system, this ultrasonic atomization technique are provided with complete DCS automatic control systems, are equipped with corresponding pressure The monitoring devices such as sensor, PH detector and liquid level gauge and inlet and outlet smoke on-line monitoring system, will be monitored by electric signal and tied Fruit is transmitted to Central Control Room processor and focused on, and makes correct response to system automatically.
The electrostatic precipitator has four electrion electric fields, and the first electric field is negative high voltage direct-current discharge electric field, with cigarette Gas inlet duct is connected, as pre- level of gathering dust；Second electric field and the 3rd electric field are positive high voltage pulsed discharge electric field, straight with first Stream electric field is connected, as dust granules are charged and various pollutants of fume cooperation-removal level；4th electric field is that negative high voltage direct current is put Electric field, after the 3rd positive high voltage pulsed discharge electric field, gathered dust level as coalescence.
In percentage by weight, compound alkali lye forms the compound alkali lye of desulfurization including the following raw material：It is calcium chloride 8 ~ 25%, white Mud 2 ~ 3%, sodium hydroxide 4 ~ 8%, barium monoxide 0.5 ~ 1.2%, magnesium hydroxide 0.8 ~ 1%, calcium hydroxide 5 ~ 10%, seven hydrated sulfuric acids are sub- Iron 9 ~ 16%, lithium peroxide 7 ~ 9%, potassium permanganate 5 ~ 10%, water 15 ~ 25%, lithium hydroxide 3 ~ 7%, prodan 4 ~ 10%, sodium carbonate 4 ~ 10%, Ethylene diamine phosphate 0.8 ~ 1.7%.Before addition calcium hydroxide enters compound alkali lye, calcium hydroxide is first worn into 4000- 5000 mesh powders.
Environmental benefit caused by this year invention：Ultrasonic atomization desulfurization, dedusting and prevention the escaping of ammonia integration waste gas are net Chemical industry artistic skill enough effectively controls and reduced SO2 in cement industry flue gas and discharges, and synchronously reaches dedusting, prevents the escaping of ammonia effect, With great environmental benefit.
Social benefit caused by this year invention：Contributes to contemporary times and brings benefits for future centuries for environmental protection project.Ultrasonic atomization desulfurization, remove Dirt and a great revolution for preventing the escaping of ammonia integration waste gas purification technology field, necessarily drive its relevant industries such as manufacture of cement Change, for promote China's industrial repositioning play positive impetus.There are thousands of cement, steel, thermoelectricitys etc. in China at present Industry urgent need ultrasonic atomization technique is rectified and improved to its sulfur dioxide emission reduction.

Claims (8)

1. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting prevents the escaping of ammonia integral system, it is characterised in that including：
Ultrasonic atomizing system, flue gas pass through water conservancy diversion by ultrasonic wave flue, the compound alkali lye of circulation desulfurization in ultrasonic wave flue By will form the uniform haze being made up of micron order fine mist after high-pressure pump voltage supply and ultrasonic equipment atomization, haze is abundant Fill ultrasonic wave flue, and stop through flue gas, SO2 is atomized desulfurizing agent and catches and react rapidly in flue gas；Pass through Supersonic generator discharges ultrasonic wave, and the compound alkali lye of desulfurization is vibrated into the atomization gas less than 5-10 μm, and surface tension is big, Doctor solution has certain viscosity in itself, can effectively catch the dust in flue gas, and supersonic generator can effectively catch denitration The ammonia of technique escape, and the ammonia for escape is further anti-with nitrogen oxides generation reduction in the environment of ultrasonic oscillation atomization Should；
Atomization system, flue gas after desulfurization temperature reduce, and smoke moisture is larger, will by the demisting reaction tower of built-in demisting packing layer Most dust and water smoke containing SO2 are retained down, and after desulfurization demisting, clean flue gas returns in the case where draining fan action To original flue simultaneously；
Caused waste liquid collects below range of atomization flue and led by orientation in water treatment system, ultrasonic system and deentrainment tower Stream is collected into regenerated reactor；The pulverized limestone that digestion is added in regenerated reactor is allowed to generate sulphur stone with the sulfuric acid reactant salt of desulfurization generation Cream, the follow-up flocculant that adds make the sulphur gypsum of generation and dust further flocculate into larger alumen ustum；Flocculated in regenerated reactor through regeneration Underflow liquid is extracted to concentrating and separating at hydrocyclone after processing, and limpid overflowing liquid is collected to circulation medicament pond and supplies ultrasonic system Use, cyclone bottom concentrate to vacuum filter dewater treatment, obtain block gypsum；
Medicine system, medicine system include water treatment dosing system and desulfurizing agent medicine system；Water treatment medicine is mainly lime Add slaking apparatus and PAC, PAM medicine dissolving tank three parts are formed, be responsible for adding water treatment agent to regenerated reactor；Desulfurizing agent dosing system System is counted comprising desulfurizing agent automatic adding device, catalyst automatic adding device and desulfurizing agent pond composition, PH built in desulfurization medicament pond Automatic medicament feeding machine dosing is controlled, desulphurization catalyst fills according to desulfurizing agent pond inflow automatic feeding, desulfurizing agent in desulfurizing agent pond After dividing dissolving mixing, it is supplemented to circulation medicament pond and is mixed with regenerated liquid, form circulating medical solution.
2. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：Also include flue gas flow guide system, flue gas is taken off through being introduced into after electrostatic dust collection equipment in ultrasonic atomizing system Sulphuring treatment, is provided with shunting zone between induced duct and ultrasonic atomizing system, and flue gas respectively enters ultrasound through water conservancy diversion uniform flux Wave system is united in each sub- flue.
3. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：Flue gas passes through 20 meters of ultrasonic wave flues by water conservancy diversion with 3.47m/s flow velocitys.
4. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：Regenerated reactor side is provided with accident emergency pond.
5. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：The water treatment dosing system also includes lime silo.
6. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：Integral system also includes automatic control system, and automatic control system is equipped with corresponding pressure sensor, PH detections The monitoring device such as device and liquid level gauge and inlet and outlet smoke on-line monitoring system, are transmitted monitoring result to Central Control Room by electric signal Processor focuses on.
7. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：
In percentage by weight, compound alkali lye forms the compound alkali lye of desulfurization including the following raw material：
Calcium chloride 8 ~ 25%
White clay 2 ~ 3%
Sodium hydroxide 4 ~ 8%
Barium monoxide 0.5 ~ 1.2%
Magnesium hydroxide 0.8 ~ 1%
Calcium hydroxide 5 ~ 10%
Green vitriol 9 ~ 16%
Lithium peroxide 7 ~ 9%
Potassium permanganate 5 ~ 10%
Water 15 ~ 25%
Lithium hydroxide 3 ~ 7%
Prodan 4 ~ 10%
Sodium carbonate 4 ~ 10%
Ethylene diamine phosphate 0.8 ~ 1.7%.
8. a kind of thermal power plant's ultrasonic atomization desulfurization and dedusting according to claim 1 prevents the escaping of ammonia integral system, its It is characterised by：The electrostatic precipitator has four electrion electric fields, and the first electric field is negative high voltage direct-current discharge electric field, with cigarette Gas inlet duct is connected, as pre- level of gathering dust；Second electric field and the 3rd electric field are positive high voltage pulsed discharge electric field, straight with first Stream electric field is connected, as dust granules are charged and various pollutants of fume cooperation-removal level；4th electric field is that negative high voltage direct current is put Electric field, after the 3rd positive high voltage pulsed discharge electric field, gathered dust level as coalescence.
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