CN203425920U - Electrostatic dedusting system - Google Patents
Electrostatic dedusting system Download PDFInfo
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- CN203425920U CN203425920U CN201320459807.2U CN201320459807U CN203425920U CN 203425920 U CN203425920 U CN 203425920U CN 201320459807 U CN201320459807 U CN 201320459807U CN 203425920 U CN203425920 U CN 203425920U
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- dedusting
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Abstract
The utility model relates to a dedusting device, and discloses an electrostatic dedusting system, which solves the problem that in the conventional technology, the electrostatic dedusting system is low in dedusting efficiency, and causes reentrainment of dust during strip breakage vibration to lead to dust discharge out of limit. The system comprises an air inlet, an air outlet, N electric field areas parallely arranged and a power supply arranged corresponding to the electric field areas, wherein the first electric field area is adjacent to the air inlet, the last electric field is adjacent to the air outlet, and N is an integer greater than 1. The improvement of the system provided by the utility model is that a mobile polar plate electric field is further arranged between the last electric field and the air outlet, the mobile polar plate electric field is provided with a rotatable mobile polar plate, and an ash bucket is arranged at the lower end of the mobile polar plate electric field. The system provided by the utility model can improve the dedusting efficiency and effectively inhibit reentrainment of dust and back corona phenomenon, and is applicable to dedusting of a thermal power plant.
Description
Technical field
The utility model relates to a kind of dust arrester, relates in particular to a kind of electrostatic precipitation system that is applied in power plant.
Background technology
Electrostatic precipitator be a kind of by ash-laden gas in the process ionizing by high voltage electric field, make dust charged, and make adsorbing powder dust on dust arrester under the effect of electric field force, thus a kind of dedusting environment friendly equipment that dust is separated from boiler waste gas; Electrostatic precipitator is mainly by by anode system, cathod system, anode and cathode rapping apparatus, incubator, even gas distribution device, housing, the compositions such as ash bucket and row's ash conveying device. anode system is arranged by pole plate, and anvil unit and antiswing device form. and cathod system is by cathode frame, cathode beam, cathode hanger system, the compositions such as antiswing device. the vibration dust-cleaning of negative electrode adopts top electromagnetic hammer rapping, and anode system adopts the rapping of side arm sinker hammer.Industrial Frequency Transformer is arranged on dust remover roof, and high-tension electricity directly, by high voltage isolator, is sent into cathod system after damping resistance.
The two chambers four electric field electrostatic precipitator that our factory uses of take are example, and it has four electric field regions: the first electric field region, the second electric field region, the 3rd electric field region, the 4th electric field region; In each electric field region, all have metal electrode, the lower position in electric field region also has ash bucket in order to collect the dust under rapping from electrode; The first electric field region and air inlet are adjacent, and the 4th electric field region is adjacent with exhaust outlet.
Its operation principle is: on 2 radius of curvature differ larger metal anode and negative electrode, pass to high voltage direct current (high pressure silicon rectifying transformer becomes 66～72kV high voltage direct current by 380V AC rectification), maintain an electrostatic field that is enough to make gas ionization.After gas ionization, generate anion and cation, these ionic adsorption are being passed through on the dust of electric field, make dust obtain electric charge. charged dust is under the effect of electric field force, to the contrary electrode operation of electric polarity, emit institute electrically charged and be deposited on electrode, make dust separated from the gas, and make ash fall into electrostatic precipitator bottom ash bucket by vibration dust-cleaning, thereby reach the object of dedusting.
But in use,, the inner dust concentration in electric field region is too high, a little less than frequent electric discharge causes electric field strength too.Part dust nuclear power difficulty, the electrically charged electric weight of institute very little, cannot adsorb, and efficiency of dust collection is low.From the rapping method of operation of electrostatic precipitator, in order to guarantee that polar board surface is clean, improve vibration dust-cleaning effect, improve the adsorption capacity of pole plate and effectively suppress back corona phenomenon, in a shaking cycle, can repeatedly carry out auto-breaking rapping.When each power-off rapping meeting causes the 4th electric field power-off rapping of reentrainment of dust, especially afterbody of dust, the reentrainment of dust of generation can directly be discharged from chimney along with air-flow, cause dust emission to exceed standard.Utility model content
Technical problem to be solved in the utility model is: propose a kind of electrostatic precipitation system, the electrostatic precipitator efficiency of dust collection solving in conventional art is low, also can produce reentrainment of dust, the problem that causes dust emission to exceed standard when carrying out broken belt rapping.
The utility model solves the problems of the technologies described above adopted technical scheme:
A kind of electrostatic precipitation system, the power supply that comprises the corresponding configuration in Ji Yuge electric field region, N electric field region of air inlet, gas outlet, parallel arranged, that first electric field region is connected with air inlet is adjacent, last electric field region is adjacent with gas outlet, and described N is greater than 1 integer; Improvement of the present utility model is: in the end between Hou，Yu gas outlet, an electric field region, be also provided with Mobile pole plate electric field region, be provided with rotatable Mobile pole plate, and be provided with ash bucket in the lower end of this Mobile pole plate electric field region in this Mobile pole plate electric field region.
Further, described rotatable Mobile pole plate favorable current in Mobile pole plate electric field region is arranged.
Further, in described ash bucket, be provided with dust cleaning brush.
Further, the number of described dust cleaning brush is at least two.
Further, described N=4, wherein adopts high frequency electric source with the power supply of the corresponding configuration in first electric field region with the power supply of second corresponding configuration in electric field region.
The beneficial effects of the utility model are: by the afterbody at electric dust collector, increase Mobile pole plate electric field region, utilize the Mobile pole plate in electric field region effectively to suppress reentrainment of dust and back corona phenomenon; Further, by the transformation to the power supply of electric field region, change the power frequency supply of first electric field region and second electric field region into high frequency electric source, can improve the nuclear power ability of dust, thereby improve the efficiency of dedusting.
Accompanying drawing explanation
Fig. 1 is that schematic diagram is arranged in each electric field region of electrostatic precipitation system in the utility model embodiment;
Fig. 2 is power frequency supply and high frequency electric source supply waveform comparison diagram.
The specific embodiment
For the electrostatic precipitator efficiency of dust collection solving in conventional art low, when carrying out broken belt rapping, also can produce reentrainment of dust, the problem that causes dust emission to exceed standard, the utility model proposes a kind of novel electrostatic precipitation system, with respect to conventional art, main corrective measure of the present utility model is: 1, by the afterbody at electric dust collector, increase Mobile pole plate electric field region, utilize the Mobile pole plate in electric field region effectively to suppress reentrainment of dust and back corona phenomenon; 2, by the transformation to the power supply of electric field region, change the power frequency supply of first electric field region and second electric field region into high frequency electric source, can improve the nuclear power ability of dust, thereby improve the efficiency of dedusting.
Still the two chambers four electric field electrostatic precipitator that our factory uses of take are example, and it has four electric field regions: the first electric field region, the second electric field region, the 3rd electric field region, the 4th electric field region; This is by transformation, between the 4th Hou Yu gas outlet, electric field region, increased a Mobile pole plate electric field region, as shown in Figure 1, in electric field region, downstream direction is furnished with Mobile pole plate, lower end position in electric field region is provided with for collecting the ash bucket of dust, is provided with dust cleaning brush in ash bucket; In this Mobile pole plate electric field region, as other several electric field regions, remain and rely on electrostatic force to collect dust: the high voltage from high-voltage DC power supply is applied on corona wire, corona wire produces corona discharge, after the dust of flowing through in the flue gas of electric field is charged, under electric field force effect, be collected on Mobile pole plate.When pole plate rotates to the ash bucket of electric field lower end, dust cleaning brush brushes the dust of plate face in the position away from air-flow; By the rotation of pole plate and the relative motion of dust cleaning brush, by force the ash on pole plate is cleared away; Because dust cleaning brush is mounted in ash bucket, ash bucket internal cause does not have air-flow to pass through, and is cleaned the dust that gets off because Action of Gravity Field directly drops in ash bucket, has effectively prevented the problem of the reentrainment of dust that brings because of deashing.It should be noted that, the quantity of dust cleaning brush arrange can adopt a plurality of, to improve the efficiency of cleaning dust.
In addition, on the power supply selection issue to electric field region, in this example, change the original power frequency supply using in the first electric field region and the second electric field region into high frequency electric source, the supply current of high frequency electric source consists of a series of burst pulses, its pulse height, width and frequency all can be adjusted, can provide various voltage waveforms to electric cleaner, control mode is flexible, thereby can provide most suitable voltage waveform according to the operating mode of electric cleaner, improve the efficiency of dust collection of electric cleaner, and can improve power supplying efficiency, save electric energy.In addition, high frequency electric source is compared with power frequency supply, also has volume little, lightweight, the plurality of advantages such as three-phase equilibrium power supply.Fig. 2 the first half has illustrated the supply waveform of power frequency supply, the latter half to illustrate the supply waveform of high frequency electric source, can find out, the positive half-wave of power frequency supply is very wide, and every 10ms just produces a positive half-wave, and secondary voltage is not steady yet.When flashing discharges, convalescence is very long, has affected dust collection effect.High frequency electric source just can produce a positive half-wave being less than 25Vs, and can be shorter, from secondary current, see and more approach direct current, it is constant that secondary voltage will maintain crest voltage, when running into spark discharge, it is very fast that voltage recovers, and can myopia be interpreted as and be operated in crest voltage work always, and secondary voltage is to improve field intensity to guarantee dust nuclear power and a how many important indicator of institute's carried charge.
To sum up, because the first electric field region and the second electric field region have adopted high frequency electric source, improve electric field strength, guaranteed the charged ability of dust; Such the first electric field region can guarantee to gather dust big dust particle more than 80%, and the second electric field region guarantees to gather dust more than 15%, and the 3rd electric field and the 4th electric field can guarantee 4% left and right of gathering dust; Remaining ultrafine dust utilizes afterbody Mobile pole plate electric field to collect, and has not only suppressed back corona phenomenon, guarantees the collection of ultrafine dust, and has effectively prevented reentrainment of dust.
Carrying out before above-mentioned modification measures, place, the electrostatic precipitator gas outlet dust emission that our factory is used is generally in 200mg/m3 left and right, can reach 400mg/m3 when afterbody the 4th electric field anode system power-off rapping more than, Gao Shike reaches 700mg/m3 left and right, to our factory, has brought great environmental protection pressure; And by after above-mentioned transformation, efficiency of dust collection improves greatly.Finally reached the dust emission standard that is less than 30mg/m3 of national environmental protection portion regulation.
It should be noted that, except the first electric field region and the second electric field region employing high frequency electric source, other electric field region also can adopt high frequency electric source, and for the first electric field region and the second electric field region, be main dedusting area and cost-saving consideration in the present embodiment, only in the first electric field region and the second electric field region, use high frequency electric source; Thereby; the claimed scope of the utility model comprises but is not limited only to above-described embodiment; those skilled in the art are according to being described in above equivalent modifications/replacement of in the situation that does not depart from the utility model Spirit Essence, technology contents of the present utility model being made, all within protection domain of the present utility model.
Claims (5)
1. an electrostatic precipitation system, the power supply that comprises the corresponding configuration in Ji Yuge electric field region, N electric field region of air inlet, gas outlet, parallel arranged, that first electric field region is connected with air inlet is adjacent, last electric field region is adjacent with gas outlet, and described N is greater than 1 integer; It is characterized in that, in the end between Hou，Yu gas outlet, an electric field region, be also provided with Mobile pole plate electric field region, in this Mobile pole plate electric field region, be provided with rotatable Mobile pole plate, and be provided with ash bucket in the lower end of this Mobile pole plate electric field region.
2. a kind of electrostatic precipitation system as claimed in claim 1, is characterized in that, described rotatable Mobile pole plate favorable current in Mobile pole plate electric field region is arranged.
3. a kind of electrostatic precipitation system as claimed in claim 1, is characterized in that, in described ash bucket, is provided with dust cleaning brush.
4. a kind of electrostatic precipitation system as claimed in claim 3, is characterized in that, the number of described dust cleaning brush is at least two.
5. a kind of electrostatic precipitation system as described in claim 1-4 any one, is characterized in that, described N=4 wherein adopts high frequency electric source with the power supply of the corresponding configuration in first electric field region with the power supply of second corresponding configuration in electric field region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320459807.2U CN203425920U (en) | 2013-07-30 | 2013-07-30 | Electrostatic dedusting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320459807.2U CN203425920U (en) | 2013-07-30 | 2013-07-30 | Electrostatic dedusting system |
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| Publication Number | Publication Date |
|---|---|
| CN203425920U true CN203425920U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320459807.2U Expired - Fee Related CN203425920U (en) | 2013-07-30 | 2013-07-30 | Electrostatic dedusting system |
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| CN (1) | CN203425920U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312158A (en) * | 2014-06-09 | 2016-02-10 | 黄河 | Multistage parallel static-electric air filtering plate |
-
2013
- 2013-07-30 CN CN201320459807.2U patent/CN203425920U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312158A (en) * | 2014-06-09 | 2016-02-10 | 黄河 | Multistage parallel static-electric air filtering plate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20150730 |
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| EXPY | Termination of patent right or utility model |