CN102489405B - Method and device for high-voltage static dust removal - Google Patents
Method and device for high-voltage static dust removal Download PDFInfo
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- CN102489405B CN102489405B CN201110391938.7A CN201110391938A CN102489405B CN 102489405 B CN102489405 B CN 102489405B CN 201110391938 A CN201110391938 A CN 201110391938A CN 102489405 B CN102489405 B CN 102489405B
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- rapping
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- gap
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- 239000000428 dust Substances 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003068 static effect Effects 0.000 title abstract 2
- 230000000694 effects Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 17
- 230000005684 electric field Effects 0.000 description 7
- 239000003500 flue dust Substances 0.000 description 7
- 238000010009 beating Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005367 electrostatic precipitation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Abstract
The invention discloses a method and a device for high-voltage static dust removal. The method comprises detecting dust content in exhaust gas, vibrating a pole plate with absorbed charged dust, determining time interval between current vibration operation and next vibration operation based on the dust content, and automatically selecting combination of vibration modes based on size of the dust content and duration. By means of the technical scheme, a proper vibration interval and a proper vibration mode can be selected based on the dust content (turbidity) in the exhaust gas, and therefore the problems of excessive vibration or insufficient vibration of the pole plate are well resolved.
Description
Technical field
The present invention relates to a kind of high-pressure electrostatic precipitation method and apparatus.
Background technology
In fume emission, need to use electrostatic precipitator and remove the flue dust in flue gas.Electrostatic precipitator generally can comprise ionization part, absorbed portion and control section.Ionization part can produce high voltage electric field, flue dust when this high voltage electric field of flue gas process in flue gas is ionized charged, charged flue dust enters absorbed portion, this absorbed portion has multiple pole plates, the polarity of this pole plate is contrary with the polarity of charged flue dust, when flue dust enters absorbed portion, under the effect of electric field force, is adsorbed on pole plate.Absorbed portion also has rapping apparatus, and this rapping apparatus carries out regular rapping to pole plate, and the certain thickness flue dust that has that makes to be adsorbed on pole plate drops in the ash bucket below pole plate under the double action of deadweight and vibration, thereby realizes the object of removing flue dust.Control section can be used for control example as imposed on the voltage of pole plate, shaking cycle etc.
Pole plate is carried out in rapping process, if rapping is too frequent, crosses and beat, the dust being collected on pole plate can not become bulk to fall into ash bucket, and secondary fly-up is serious, and the especially secondary fly-up of final stage electric field will reduce efficiency of dust collection greatly.Otherwise, if rapping is very few, owe to beat, can make pole plate deashing unclean, even likely make the dust of pole plate blocked up, make space electric field voltage drop, secondary current reduces, and corona discharge power reduces, and affects the charged of dust, finally affects dust removing effects.And existing electrostatic precipitator adopts single or simple timing combination rapping mode, can not finely overcome and beat or owed the problem of beating
Summary of the invention
The object of this invention is to provide a kind of electrostatic dust removing method and equipment, can fine solution cross and beat and owe the problem of beating.
To achieve these goals, the invention provides a kind of electrostatic dust removing method, the method comprises: detect the dust content in discharge gas; There is the pole plate of charged dust to carry out rapping to absorption, determine the time interval between current rapping operation and the operation of rapping next time according to described dust content, and automatically select rapping mode to combine according to dust content size and duration.
The present invention also provides a kind of electrostatic dust collection equipment, and this equipment comprises pole plate, rapping apparatus and controller, and wherein, this equipment also comprises turbidity detection device, for detection of the dust content in discharge gas; And described controller is for obtaining this dust content from described turbidity detection device, control described rapping apparatus described pole plate is carried out to rapping, determine current rapping operation and start the time interval between rapping operation next time according to this dust content, and automatically selecting rapping mode to combine according to dust content size and duration.
By technique scheme, can select suitable rapping interval and rapping mode to combine according to the dust content (turbidity) in discharge gas, beat or owe the problem of beating thereby can be good at overcoming.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the electrostatic dust collection equipment of an embodiment of the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 1 is according to the schematic diagram of the electrostatic dust collection equipment of an embodiment of the invention.As shown in Figure 1, according to an embodiment of the invention, provide a kind of electrostatic dust collection equipment, this equipment can comprise pole plate 10, rapping apparatus 20 and controller 40, wherein, this equipment can also comprise turbidity detection device 30, for detection of the dust content in discharge gas; And described controller 40 is for obtaining this dust content from described turbidity detection device 30, control described rapping apparatus 20 described pole plate 10 is carried out to rapping, determine current rapping operation and start the time interval between rapping operation next time according to this dust content, and automatically selecting rapping mode to combine according to dust content size and duration.
Described turbidity detection device 30 can be the device well known to a person skilled in the art for detection of dust content in emission gases, for example P-5B particle detector (turbidity detector), turbidity detection device 30 can be arranged on discharge gas (for example flue gas) exit of electrostatic dust collection equipment.
Determine according to the dust content of discharge gas that time of rapping next time operation and rapping mode can solve well and in prior art, cross the problem of beating or owing dozen.If dust content is larger when current rapping operation, can the time interval between current rapping operation and the operation of rapping next time be set shortlyer; If dust content is smaller when current rapping operation, can the time interval between current rapping operation and the operation of rapping next time be set more longerly.Can automatically adjust the time interval between rapping operation according to the content of dust in discharge gas like this, can fine adaptation discharge gas in the variation of dust content.
Dust content and can be for example inversely proportional relation between the time interval.But it will be understood by those skilled in the art that the in the situation that of design according to the invention, can also have other relation.
In addition, can also different rapping patterns be set according to dust content.In the preferred embodiment of the present invention, described controller 40 can also be used for determining that described dust content belongs to an interval in one group of predefined interval, uses the rapping pattern corresponding with this interval to control described rapping apparatus 20; Described rapping pattern comprises one in the following or several persons' any combination:
Rapping continuously, step-down rapping, gap rapping and power-off rapping.
Described one group of predefined interval is larger than the desired value of dust content.
Here set suitable rapping pattern according to dust content in discharge gas, and can more optimize dust removing effects.Rapping continuously, step-down rapping, gap rapping and power-off rapping are the rapping modes of using in this area.
Continuously rapping is conventional rapping mode, pole plate 10 is continued to rapping, keeps on pole plate 10 voltage constant simultaneously.
Step-down rapping is to reduce the voltage on this pole plate 10 when described pole plate 10 is carried out to rapping; And
Power-off rapping is to turn-off the voltage on this pole plate 10 when described pole plate 10 is carried out to rapping.
Gap rapping is that pole plate 10 is carried out to intermittent rapping, and in the time of rapping, keeps the voltage on pole plate 10 constant.
Wherein, in the situation that using step-down rapping, described controller 40 is also for reducing the voltage on described pole plate 10.
Wherein, in the situation that using power-off rapping, described controller 40 is also for turn-offing the voltage on described pole plate 10.
Here, controller 40 can also be controlled the voltage applying on pole plate 10, for example, recently realize the control to pole plate 10 voltages by the angle of flow or the duty of controlling reverse-blocking tetrode thyristor.
Further,
If the described dust content detecting belongs to minimum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this minimum is: gap rapping and power-off rapping combination; Because dust content is lower, now should be discharge gas dust content (for example dust concentration) lower or dust removing effects is better, utilize gap rapping regularly to remove the dust of collecting on pole plate 10, utilize power-off rapping to carry out thorough peace and quiet pole plate 10.
If the described dust content detecting belongs to maximum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this maximum is: gap rapping, step-down rapping, power-off rapping and rapping combination continuously.
Wherein, described gap rapping, step-down rapping, power-off rapping can comprise with the mode of rapping combination continuously:
In the case of the described dust content that detects higher be due to the dust content in discharge gas causes more greatly, use the rapping of described gap;
In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and for example, use power-off rapping and rapping continuously in the time that the rear described dust content of experience a period of time (20-50 minute) does not still reduce.
If the dust content detecting is higher, for example may be now, because discharge gas dust content (dust concentration) dust removing effects higher or electrostatic dust collection equipment is poor.Can utilize load signal or other external condition auxiliary judgment dust concentration higher is to cause because load increases, but not dust removing effects variation causes, in this case, can regularly remove the dust of collecting on pole plate with gap rapping; If extraneous subsidiary conditions do not change, judge that dust concentration is higher because dust removing effects variation causes, now first automatically use step-down rapping and gap rapping pattern, when dust content does not still reduce after experience a period of time, automatically use power-off rapping and continuous rapping pattern.
Described pole plate 10 can be multiple, is successively set on this dirt pocket 50 from entrance to the outlet of dirt pocket 50; In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and use when after experience a period of time, described dust content does not still reduce power-off rapping and continuously rapping comprise:
First to returning to gap rapping in multiple pole plates 10 after a nearest pole plate 10 of described entrance uses described power-off rapping and rapping reaches the scheduled time continuously; After more next pole plate 10 being used described power-off rapping and rapping reaches the scheduled time continuously, return to gap rapping, until return to gap rapping to after all using described power-off rapping except all pole plates 10 from the nearest pole plate 10 of described outlet and rapping reaching the scheduled time continuously; And
Use step-down rapping and gap rapping to described from the nearest pole plate 10 of described outlet always.
If have four pole plates 10 (forming four electric fields) in a dirt pocket 50, and start to use in turn above-mentioned power-off rapping and continuous rapping pattern from first pole plate 10 (from the nearest pole plate 10 of dirt pocket 50 entrances).First first pole plate 10 is used to power-off rapping and rapping continuously, for example, after the scheduled time (2-5 minute), return to gap rapping, now second pole plate 10 used to power-off rapping and rapping continuously, after the scheduled time, return to gap rapping, then the 3rd pole plate 10 used to power-off rapping and rapping continuously.But inapplicable this pattern of last pole plate 10 (exporting the 4th nearest pole plate 10 from dirt pocket 50), the 4th pole plate 10 uses step-down rapping and gap rapping pattern all the time.This pattern circulates always, for example, until dust content drops to setting value (, the lower limit in this correspondence interval).
If the described dust content detecting belongs in described one group of predefined interval between the mesozone between maximum interval and minimum interval, with this mesozone between corresponding rapping pattern be: step-down rapping is combined with gap rapping; Normal voltage when magnitude of voltage when now step-down rapping on pole plate 10 should be continuous rapping on pole plate 10 is below 30%, and step-down rapping for example, for example, is carried out in turn from first pole plate 10 (the first pole plate 10) to last pole plate 10 (quadripolar plate 10).
As shown in Figure 1, except said modules, this equipment can also comprise dirt pocket 50 and ash bucket 60, and pole plate 10 is arranged in dirt pocket 50, and ash bucket 60 is positioned at the below of dirt pocket 50.
Correspondingly, according to an embodiment of the invention, also provide a kind of electrostatic dust removing method, the method can comprise:
Detect the dust content in discharge gas;
There is the pole plate 10 of charged dust to carry out rapping to absorption, and determine current rapping and time interval between rapping next time according to described dust content.
Preferably, described dust content and the described time interval can inversely proportional relations.
Preferably, the method can also comprise:
Determine that the dust content detecting belongs to one group of predefined interval interval;
Use the rapping pattern corresponding with this interval to have the pole plate 10 of charged dust to carry out rapping to absorption; Described rapping pattern comprises one or any combination in the following:
Rapping continuously, step-down rapping and power-off rapping.
Described step-down rapping is to reduce the voltage on this pole plate 10 when described pole plate 10 is carried out to rapping; And
Described power-off rapping is to turn-off the voltage on this pole plate 10 when described pole plate 10 is carried out to rapping.
Gap rapping is that pole plate 10 is carried out to intermittent rapping, and in the time of rapping, keeps the voltage on pole plate 10 constant.
Preferably, if the described dust content detecting belongs to minimum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this minimum can be: gap rapping and power-off rapping combination; Because dust content is lower, now should be discharge gas dust content (for example dust concentration) lower or dust removing effects is better, utilize gap rapping regularly to remove the dust of collecting on pole plate 10, utilize power-off rapping to carry out thorough peace and quiet pole plate 10.
Preferably, if the described dust content detecting belongs to maximum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this maximum can be gap rapping, step-down rapping, power-off rapping and rapping combination continuously.
Wherein, described gap rapping, step-down rapping, power-off rapping can comprise with the mode of rapping combination continuously:
In the case of the described dust content that detects higher be due to the dust content in discharge gas causes more greatly, use the rapping of described gap;
In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and for example, use power-off rapping and rapping continuously in the time that the rear described dust content of experience a period of time (20-50 minute) does not still reduce.
If the dust content detecting is higher, for example may be now, because discharge gas dust content (dust concentration) dust removing effects higher or electrostatic dust collection equipment is poor.Can utilize load signal or other external condition auxiliary judgment dust concentration higher is to cause because load increases, but not dust removing effects variation causes, in this case, can regularly remove the dust of collecting on pole plate with gap rapping; If extraneous subsidiary conditions do not change, judge that dust concentration is higher because dust removing effects variation causes, now first automatically use step-down rapping and gap rapping pattern, when dust content does not still reduce after experience a period of time, automatically use power-off rapping and continuous rapping pattern.
Described pole plate 10 can be multiple, is successively set on this dirt pocket 50 from entrance to the outlet of dirt pocket 50; In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and use when after experience a period of time, described dust content does not still reduce power-off rapping and continuously rapping comprise:
First to returning to gap rapping in multiple pole plates 10 after a nearest pole plate 10 of described entrance uses described power-off rapping and rapping reaches the scheduled time continuously; After more next pole plate 10 being used described power-off rapping and rapping reaches the scheduled time continuously, return to gap rapping, until return to gap rapping to after all using described power-off rapping except all pole plates 10 from the nearest pole plate 10 of described outlet and rapping reaching the scheduled time continuously; And
Use step-down rapping and gap rapping to described from the nearest pole plate 10 of described outlet always.
If have four pole plates 10 (forming four electric fields) in a dirt pocket 50, and start to use in turn above-mentioned power-off rapping and continuous rapping pattern from first pole plate 10 (from the nearest pole plate 10 of dirt pocket 50 entrances).First first pole plate 10 is used to power-off rapping and rapping continuously, for example, after the scheduled time (2-5 minute), return to gap rapping, now second pole plate 10 used to power-off rapping and rapping continuously, after the scheduled time, return to gap rapping, then the 3rd pole plate 10 used to power-off rapping and rapping continuously.But last pole plate 10 exports the 4th nearest inapplicable this pattern of pole plate 10 from dirt pocket 50, and the 4th pole plate 10 uses step-down rapping and gap rapping pattern all the time.This pattern circulates always, for example, until dust content drops to setting value (, the lower limit in this correspondence interval).
Preferably, if the described dust content detecting belongs in described one group of predefined interval between the mesozone between maximum interval and minimum interval, with this mesozone between corresponding rapping pattern can be: step-down rapping is combined with gap rapping; Below 30% of normal voltage when magnitude of voltage when now step-down rapping on pole plate 10 should be continuous rapping on pole plate 10, step-down rapping for example, for example, is carried out in turn from first pole plate 10 (the first pole plate 10) to last pole plate 10 (quadripolar plate 10).
By above electrostatic dust collection equipment and method, can solve well the mistake existing due to single, fixing rapping mode in prior art and beat or owe the problem of beating, can improve dust removing effects.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned detailed description of the invention, in reconcilable situation, can combine by any suitable mode.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. an electrostatic dust removing method, the method comprises:
Detect the dust content in discharge gas;
There is the pole plate (10) of charged dust to carry out rapping to absorption, and determine the time interval between current rapping operation and the operation of rapping next time according to described dust content;
Determine that the dust content detecting belongs to one group of predefined interval interval;
Use the rapping pattern corresponding with this interval to have the pole plate (10) of charged dust to carry out rapping to absorption;
Described rapping pattern comprises one in the following or several persons' any combination:
Rapping continuously, step-down rapping, gap rapping and power-off rapping;
Wherein,
If the described dust content detecting belongs to minimum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this minimum is: gap rapping and power-off rapping combination;
If the described dust content detecting belongs to maximum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this maximum is: gap rapping, step-down rapping, power-off rapping and rapping combination continuously;
If the described dust content detecting belongs in described one group of predefined interval between the mesozone between maximum interval and minimum interval, with this mesozone between corresponding rapping pattern be: step-down rapping is combined with gap rapping.
2. method according to claim 1, wherein, described dust content and inversely proportional relation of the described time interval.
3. method according to claim 1, wherein:
Described step-down rapping for reducing the voltage on this pole plate (10) when described pole plate (10) is carried out to rapping; Described power-off rapping for turn-offing the voltage on this pole plate (10) when described pole plate (10) is carried out to rapping; And the rapping of described gap keeps the voltage on this pole plate (10) for discontinuously described pole plate (10) being carried out to rapping simultaneously.
4. method according to claim 1, wherein, the rapping of described gap, step-down rapping, power-off rapping comprise with continuous rapping combination:
In the case of the described dust content that detects higher be due to the dust content in discharge gas causes more greatly, use the rapping of described gap;
In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and use power-off rapping and rapping continuously when described dust content does not still reduce after experience a period of time.
5. method according to claim 4, wherein, described pole plate (10) is multiple, is successively set on this dirt pocket (50) from entrance to the outlet of dirt pocket (50); In the case of the described dust content that detects higher be due to dust removing effects variation causes, first use step-down rapping and gap rapping, and use when after experience a period of time, described dust content does not still reduce power-off rapping and continuously rapping comprise:
First to returning to gap rapping in multiple pole plates (10) after the nearest pole plate (10) of described entrance uses described power-off rapping and rapping reaches the scheduled time continuously; After more next pole plate (10) being used described power-off rapping and rapping reaches the scheduled time continuously, return to gap rapping, until return to gap rapping to after all using described power-off rapping except all pole plates (10) from the nearest pole plate of described outlet (10) and rapping reaching the scheduled time continuously; And
Use step-down rapping and gap rapping to described from the nearest pole plate of described outlet (10) always.
6. an electrostatic dust collection equipment, this equipment comprises pole plate (10), rapping apparatus (20) and controller (40), it is characterized in that, this equipment also comprises turbidity detection device (30), for detection of the dust content in discharge gas; And
Described controller (40) is for obtaining this dust content from described turbidity detection device (30), control described rapping apparatus (20) described pole plate (10) is carried out to rapping, and determine current rapping and time interval between rapping next time according to this dust content;
Described controller (40) is also for determining that described dust content belongs to an interval in one group of predefined interval, uses the rapping pattern corresponding with this interval to control described rapping apparatus (20); Described rapping pattern comprises one in the following or several persons' any combination:
Rapping continuously, step-down rapping, gap rapping and power-off rapping;
Wherein:
If the described dust content detecting belongs to minimum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this minimum is: gap rapping and power-off rapping combination;
If the described dust content detecting belongs to maximum interval in described one group of predefined interval, the rapping pattern corresponding with the interval of this maximum is: gap rapping, step-down rapping, power-off rapping and rapping combination continuously;
If the described dust content detecting belongs in described one group of predefined interval between the mesozone between maximum interval and minimum interval, with this mesozone between corresponding rapping pattern be: step-down rapping is combined with gap rapping.
7. equipment according to claim 6, wherein, described dust content and inversely proportional relation of the described time interval.
8. equipment according to claim 6, wherein, described step-down rapping for reducing the voltage on this pole plate (10) when described pole plate (10) is carried out to rapping; In the situation that using step-down rapping, described controller (40) is also for reducing the voltage on described pole plate (10).
9. equipment according to claim 6, wherein, described power-off rapping for turn-offing the voltage on this pole plate (10) when described pole plate (10) is carried out to rapping; In the situation that using power-off rapping, described controller (40) is also for turn-offing the voltage on described pole plate (10).
10. equipment according to claim 6, wherein, the rapping of described gap is for described pole plate (10) is carried out to rapping keeps the voltage on this pole plate (10) discontinuously simultaneously; In the situation that using gap rapping, described controller (40) does not turn-off the voltage on described pole plate (10).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103769298A (en) * | 2012-10-18 | 2014-05-07 | 金东纸业（江苏）股份有限公司 | Electrostatic precipitation system |
| CN105251618A (en) * | 2015-11-18 | 2016-01-20 | 神华集团有限责任公司 | Bilateral vibration and beating dust removal structure and system of dust remover |
| CN109967258A (en) * | 2019-04-25 | 2019-07-05 | 芜湖新兴铸管有限责任公司 | Sintering machine head end electric precipitator ash-discharging device |
| CN110665642A (en) * | 2019-10-28 | 2020-01-10 | 华北电力科学研究院有限责任公司 | Electric dust collector vibration control method and device |
| CN112354310B (en) * | 2020-10-25 | 2022-07-19 | 山西宇力特环保工程有限公司 | Multistage purification treatment system of industrial waste gas |
| CN113019705B (en) * | 2021-03-09 | 2023-06-27 | 浙江菲达环保科技股份有限公司 | Final electric field vibration control and system of electric dust removal system |
| CN114558694B (en) * | 2022-02-28 | 2022-12-20 | 广东大唐国际雷州发电有限责任公司 | Intelligent electric dust removal equipment and dust removal method for coal-fired power plant |
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