JPH06254438A - Charge control method for electrical dust controller - Google Patents
Charge control method for electrical dust controllerInfo
- Publication number
- JPH06254438A JPH06254438A JP4382593A JP4382593A JPH06254438A JP H06254438 A JPH06254438 A JP H06254438A JP 4382593 A JP4382593 A JP 4382593A JP 4382593 A JP4382593 A JP 4382593A JP H06254438 A JPH06254438 A JP H06254438A
- Authority
- JP
- Japan
- Prior art keywords
- spark discharge
- voltage
- constant
- control method
- electrostatic precipitator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Electrostatic Separation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば排ガス中のダス
ト等を捕集するための電気集じん機の荷電制御方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge control method for an electrostatic precipitator for collecting dust or the like in exhaust gas.
【０００２】[0002]
【従来の技術】従来の電気集じん機の荷電制御方法には
次のようなものがあった。 （１）火花放電検出制御2. Description of the Related Art There have been the following conventional charge control methods for an electrostatic precipitator. (1) Spark discharge detection control
【０００３】火花放電が発生すると電気集じん機荷電電
圧が急激に低下するので、これをとらえて火花放電の検
出を行ない、荷電制御用サイリスタの遮断、位相制御等
を行なって荷電レベルの急速低下抑制などを行なう方
法。 （２）定電圧、定電流制御 運転中に火花放電が発生しない場合は、設定電圧又は設
定電流に到達するとその値を一定に保つ方法。When a spark discharge occurs, the charging voltage of the electrostatic precipitator drops sharply. Therefore, the spark discharge is detected by catching this, and the charge control thyristor is cut off, the phase is controlled, etc., and the charge level is rapidly lowered. How to suppress. (2) Constant voltage, constant current control When spark discharge does not occur during operation, a method to keep the value constant when it reaches the set voltage or set current.
【０００４】上述した二つの荷電制御方法では、火花放
電の発生を防ぐことができるものの、荷電レベルを高レ
ベルに維持することができないため、電気集じん機の能
率が低下するという問題があった。そこで、荷電レベル
を可能な限り火花発生電圧レベル近くまで上昇させる方
法として次に示す制御方法が提案されている。 （３）火花頻度制御Although the above-mentioned two charge control methods can prevent the occurrence of spark discharge, they cannot maintain the charge level at a high level, which causes a problem that the efficiency of the electrostatic precipitator decreases. . Therefore, the following control method has been proposed as a method for raising the charge level to a level close to the spark generation voltage level as much as possible. (3) Spark frequency control
【０００５】火花放電検出により一定時間サイリスタゲ
ートしゃ断による荷電抑制を行なった後、サイリスタの
ゲート遮断を解除し、直ちに火花放電検出前の出力電流
・電圧より一定量だけ低いレベルまで荷電レベルを復旧
し、その後出力電流・電圧を緩やかに増加させる。この
結果、例えば火花放電開始電圧が図２に示すような変化
をした場合、その変化に追従して荷電電圧のしゃ断と上
昇とが繰り返され、常に火花発生電圧近くに荷電電圧が
保たれるようにジグザグ運転される。After the charge is suppressed by the thyristor gate cutoff for a certain period of time by detecting the spark discharge, the gate cutoff of the thyristor is released, and the charge level is immediately restored to a level lower than the output current / voltage before the spark discharge detection by a certain amount. Then, gradually increase the output current and voltage. As a result, for example, when the spark discharge start voltage changes as shown in FIG. 2, the charging voltage is cut off and increased repeatedly following the change so that the charging voltage is always maintained near the spark generation voltage. Zigzag driving is done.
【０００６】[0006]
【発明が解決しようとする課題】上記の提案された従来
の電気集じん機の荷電制御方法では、以下のような不具
合が生じる。すなわち上記の荷電制御方法では、ほぼ一
定の周期で火花放電を起こしながらの運転となるため、
火花放電によるショックで集じん電極へ付着・堆積した
ダストが飛散してしまい、集じん性能が低下するという
問題があった。特に電気抵抗の低いダストは、捕集性が
悪く、飛散性が高いため、このような低抵抗ダストの場
合、電気集じん機で荷電され、集じん電極に到達して一
旦捕集されても、その直後にその電荷を失って集じん空
間に飛び出してしまうことがある。また、集じん空間に
飛び出さないまでも集じん電極への付着力が弱いため、
わずかな火花放電のショックが与えられただけでも飛散
し、電気集じん機の集じん性能を低下させる。SUMMARY OF THE INVENTION In the above proposed conventional charge control method for an electrostatic precipitator, the following problems occur. That is, in the above charge control method, since the operation is performed while causing a spark discharge in a substantially constant cycle,
There was a problem that the dust that adhered to and accumulated on the dust collecting electrode was scattered by the shock caused by the spark discharge, and the dust collecting performance was deteriorated. In particular, dust with low electric resistance has poor collection properties and high scattering properties.Therefore, in the case of such low resistance dust, even if it is charged by the electrostatic precipitator and reaches the dust collection electrode, it is once collected. , Immediately after that, it may lose its charge and jump out into the dust collecting space. In addition, even if it does not jump out into the dust collecting space, the adhesion to the dust collecting electrode is weak,
Even if a slight shock of spark discharge is given off, it scatters and reduces the dust collecting performance of the electric dust collector.
【０００７】かかる問題を解決する手段として、予め荷
電レベルを予想火花放電発生荷電レベル以下に手動にて
設定し、運転する方法が考えられる。しかし、火花放電
発生荷電レベルは電気集じん機が処理するガス、ダスト
の状態、及び電気集じん機内部の状態によって変化する
ため、火花放電発生荷電レベルを予想することは困難で
ある。したがって上記方法の実施は困難である。As a means for solving such a problem, a method of manually setting the charge level in advance to a level below the expected spark discharge generation charge level and operating it is conceivable. However, it is difficult to predict the spark discharge generation charge level because the spark discharge generation charge level changes depending on the state of gas and dust processed by the electrostatic precipitator and the state inside the electrostatic precipitator. Therefore, the implementation of the above method is difficult.
【０００８】本発明は、極力火花放電の発生を少なく
し、しかも可能な限り高い荷電レベルで運転し、飛散性
の高い低抵抗ダストをも効率よく捕集することを可能な
らしめる電気集じん機の荷電制御方法を提供することを
目的としている。The present invention is an electrostatic precipitator which minimizes the occurrence of spark discharge, operates at the highest possible charge level, and efficiently collects low-resistance dust with high scattering properties. It is an object of the present invention to provide a charge control method of the above.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決し目的を
達成するために、本発明は、電気集じん機の運転中にお
いて火花放電が検知されたとき、前記電気集じん機の荷
電レベルを一定値だけ下げて運転を続行させ、その後一
定時間に亘り火花放電が検知されないとき、前記電気集
じん機の荷電レベルを一定の増加率で増加させるように
した。In order to solve the above problems and achieve the object, the present invention provides a charging level of an electrostatic precipitator when spark discharge is detected during operation of the electrostatic precipitator. When the spark discharge is not detected for a certain period of time after continuing the operation by lowering it by a certain value, the charge level of the electrostatic precipitator is increased at a certain increasing rate.
【００１０】[0010]
【作用】上記手段を講じた結果、次のような作用が生じ
る。火花放電が発生すると、荷電レベルは一定値だけ下
げられる。この電圧レベルは火花放電発生レベルよりも
低いレベルであり、このレベルに一定時間保持される。
このため、火花放電の発生回数は減少し、ダストが飛散
する回数が減少する。またその後、一定時間に亘り火花
放電が発生しない場合には、一定の増加率で荷電レベル
が増加する。このため、火花放電開始レベルが上昇した
場合であってもこれに追従して荷電レベルが上昇し、可
能な限り集じん電極に高い荷電電圧を印加供給すること
ができ、集じん能力を最高レベルに保つことができる。As a result of taking the above-mentioned means, the following effects occur. When a spark discharge occurs, the charge level is reduced by a certain amount. This voltage level is lower than the spark discharge generation level and is maintained at this level for a certain period of time.
Therefore, the number of spark discharges is reduced, and the number of dust scattering is reduced. Further, thereafter, when the spark discharge does not occur for a certain period of time, the charge level increases at a constant increasing rate. Therefore, even if the spark discharge start level rises, the charge level rises following it, and as high a charging voltage as possible can be applied and supplied to the dust collection electrode, the dust collection capability is at the highest level. Can be kept at
【００１１】[0011]
【実施例】図１は本発明による電気集じん機の荷電制御
方法の一実施例を示す時間−出力電圧の関係を示す図で
ある。なお、火花放電開始電圧は時間経過に伴って変化
している。FIG. 1 is a diagram showing a time-output voltage relationship showing an embodiment of a charge control method for an electrostatic precipitator according to the present invention. The spark discharge starting voltage changes with the passage of time.
【００１２】図中領域Ａは、火花放電開始電圧が一定の
領域であり、領域Ｂは、火花放電開始電圧が低下傾向に
ある領域であり、領域Ｃは、再び火花開始電圧が一定と
なった領域であり、領域Ｄは火花放電開始電圧が上昇傾
向にある領域である。In the figure, region A is a region where the spark discharge starting voltage is constant, region B is a region where the spark discharge starting voltage tends to decrease, and region C is where the spark starting voltage becomes constant again. Region D is a region where the spark discharge inception voltage tends to increase.
【００１３】領域Ａにおいて、荷電電圧が上昇し、火花
放電開始電圧に達すると火花放電が発生する（ｔ1 ）。
そうすると、荷電電圧は一定値Ｌだけ低下し、低下した
電圧のまま一定に保たれる。このため火花放電開始電圧
の近傍で火花放電を続発させる虞はない。In region A, when the charging voltage rises and reaches the spark discharge starting voltage, spark discharge occurs (t 1 ).
Then, the charging voltage is reduced by a constant value L, and the reduced voltage is kept constant. For this reason, there is no possibility that the spark discharge will continue in the vicinity of the spark discharge starting voltage.
【００１４】火花放電が発生したときより一定時間Ｔ
const が経過すると、一定の増加率（傾きθ）で電圧が
上昇し、火花放電開始電圧に達すると火花放電が発生す
る（ｔ2 ）。そうすると前述した時点ｔ1 の時と同様に
荷電電圧が一定値Ｌだけ低下し、低下した電圧のまま一
定に保たれる。From the time when the spark discharge occurs, a predetermined time T
When const passes, the voltage rises at a constant increase rate (slope θ), and when the spark discharge start voltage is reached, spark discharge occurs (t 2 ). Then, as in the case of the time point t 1 described above, the charging voltage is reduced by the constant value L, and the reduced voltage is kept constant.
【００１５】荷電電圧が一定電圧に保たれた状態におい
て領域Ｂに示すように火花放電開始電圧が下降していく
と、相対的に荷電電圧が火花放電開始電圧に達し、火花
が発生する（ｔ3 ）。このときも荷電電圧が一定値Ｌだ
け低下し、低下した電圧のまま一定に保たれる。荷電電
圧が一定に保たれた状態でさらに火花放電開始電圧が下
降していくと、荷電電圧が火花放電開始電圧に達するた
め、火花が発生する（ｔ4 ）。このときも荷電電圧が一
定値Ｌだけ低下し、低下した電圧のまま一定に保たれ
る。以上のようにして、領域Ｂでは火花放電開始電圧が
荷電電圧まで下降する毎に火花が発生し、一定値Ｌずつ
荷電電圧が低下する。When the spark discharge starting voltage is lowered as shown in the region B in the state where the charging voltage is kept constant, the charging voltage relatively reaches the spark discharge starting voltage and sparks are generated (t. 3 ). At this time as well, the charging voltage is reduced by a constant value L, and the reduced voltage is maintained constant. When the spark discharge start voltage further decreases while the charge voltage is kept constant, the charge voltage reaches the spark discharge start voltage, so that a spark is generated (t 4 ). At this time as well, the charging voltage is reduced by a constant value L, and the reduced voltage is maintained constant. As described above, in the region B, a spark is generated each time the spark discharge start voltage drops to the charging voltage, and the charging voltage decreases by the constant value L.
【００１６】領域Ｃでは火花放電開始電圧が一定とな
る。一定時間だけ経過すると荷電電圧が上昇し、火花放
電開始電圧に達すると、火花放電が発生する（ｔ5 ）。
そうすると、荷電電圧が一定値Ｌだけ低下し、低下した
電圧のまま一定時間Ｔconst だけ保たれる。火花放電が
発生したときから一定時間Ｔconst が経過すると、一定
の増加率（傾きθ）で荷電電圧が上昇し始める
（ｔ6 ）。領域Ｄでは、荷電電圧の上昇が火花放電開始
電圧の上昇よりも低いので火花が発生することはない。In the region C, the spark discharge starting voltage becomes constant. The charging voltage rises after a lapse of a certain time, and when the spark discharge start voltage is reached, spark discharge occurs (t 5 ).
Then, the charging voltage decreases by a constant value L, and the decreased voltage is maintained for a constant time T const . When T const elapses for a certain period of time after the spark discharge occurs, the charging voltage starts increasing at a constant increasing rate (slope θ) (t 6 ). In the region D, since the increase in the charging voltage is lower than the increase in the spark discharge starting voltage, no spark is generated.
【００１７】火花放電開始電圧が一定値になると、荷電
電圧が火花放電開始電圧に達し、火花が発生する
（ｔ7 ）。このため、荷電電圧は一定値Ｌだけ低下し、
低下した電圧のまま一定時間Ｔconst だけ保たれる。火
花放電が発生したときから一定時間Ｔconst が経過する
と、一定の増加率（傾きθ）で荷電電圧が上昇し始める
（ｔ8 ）。荷電電圧が火花放電開始電圧に達すると、火
花放電が発生する（ｔ9 ）。このため、荷電電圧は一定
値Ｌだけ低下し、低下した電圧のまま保持される。When the spark discharge starting voltage reaches a constant value, the charging voltage reaches the spark discharge starting voltage and sparks are generated (t 7 ). Therefore, the charging voltage decreases by a constant value L,
The lowered voltage is maintained for a certain time T const . When T const elapses for a certain period of time after the spark discharge occurs, the charging voltage starts increasing at a constant increasing rate (slope θ) (t 8 ). When the charged voltage reaches the spark discharge starting voltage, a spark discharge occurs (t 9). Therefore, the charging voltage is reduced by a constant value L, and the reduced voltage is maintained.
【００１８】ここで、従来の火花頻度制御による火花放
電の発生周期をＴF.O とすると、上記の出力一定制御を
行なう時間Ｔconst との関係は次式のように決定され
る。 Ｔconst ＞＞ＴF.O …（１） なお、Ｔconst 及びθは適宜変更可能となっている。Here, when the generation period of spark discharge by the conventional spark frequency control is T FO , the relationship with the time T const for performing the above-described constant output control is determined by the following equation. T const >> T FO (1) Note that T const and θ can be changed as appropriate.
【００１９】すなわち、本実施例においては、火花放電
発生後は、火花放電発生レベルよりも低い荷電電圧を維
持し、一定時間（Ｔconst ）出力電圧の増加を行なわず
（出力一定制御）、その後、一定の増加率（傾きθ）で
次に火花放電が発生するまで出力電圧を増加する。但
し、出力一定制御を行なっている一定時間（Ｔconst ）
以内に火花放電が発生した場合は、一定値だけ荷電電圧
を低下させる。したがって、火花放電の回数は最小限度
に抑えられ、かつ火花放電発生電圧により近い荷電電圧
で電気集じん機を運転できるため、低抵抗ダストを効率
よく捕集することが可能である。なお、本発明は上述し
た実施例に限定されるものではなく、本発明の要旨を逸
脱しない範囲で種々変形実施可能であるのは勿論であ
る。That is, in this embodiment, after the spark discharge is generated, the charging voltage lower than the spark discharge generation level is maintained, the output voltage is not increased for a fixed time (T const ) (output constant control), and thereafter, , The output voltage is increased at a constant increase rate (slope θ) until the next spark discharge occurs. However, a fixed time (T const ) during which constant output control is performed
When the spark discharge occurs within, the charging voltage is reduced by a certain value. Therefore, the number of spark discharges is suppressed to a minimum, and the electrostatic precipitator can be operated at a charging voltage closer to the spark discharge generation voltage, so that low-resistance dust can be efficiently collected. It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
【００２０】[0020]
【発明の効果】本発明によれば、火花放電が発生する毎
に一定値だけ荷電レベルを低下させ、この荷電レベルの
まま一定時間保持するようにしたので、飛散性の高い低
抵抗ダストの飛散原因となる火花放電を最小限に抑える
ことができ、しかも荷電レベルを可能な限り高く保つこ
とができるため電気集じん機の集じん性能を最大限に発
揮させ得る電気集じん機の荷電制御方法を提供できる。According to the present invention, the charge level is lowered by a constant value each time a spark discharge occurs, and the charge level is maintained for a predetermined time. Charge control method for electrostatic precipitator that can maximize the dust collecting performance of the electrostatic precipitator because the spark discharge that causes it can be minimized and the charge level can be kept as high as possible. Can be provided.
【図１】本発明による荷電制御方法の一実施例を示す時
間−電圧の関係を示す図。FIG. 1 is a diagram showing a time-voltage relationship showing an embodiment of a charge control method according to the present invention.
【図２】従来の荷電制御方法の一例を示す時間−電圧の
関係を示す図。FIG. 2 is a diagram showing a time-voltage relationship showing an example of a conventional charge control method.
Ｌ…一定電圧 θ…一定増加率
の傾きL: constant voltage θ: slope of constant increase rate
Claims (1)
検知されたとき、前記電気集じん機の荷電レベルを一定
値だけ下げて運転を続行させ、その後一定時間に亘り火
花放電が検知されないとき、前記電気集じん機の荷電レ
ベルを一定の増加率で増加させるようにしたことを特徴
とする電気集じん機の荷電制御方法。1. When a spark discharge is detected during operation of the electrostatic precipitator, the charge level of the electrostatic precipitator is lowered by a constant value to continue the operation, and no spark discharge is detected for a fixed time thereafter. At this time, the charge control method of the electrostatic precipitator is characterized in that the charging level of the electrostatic precipitator is increased at a constant increase rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4382593A JPH06254438A (en) | 1993-03-04 | 1993-03-04 | Charge control method for electrical dust controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4382593A JPH06254438A (en) | 1993-03-04 | 1993-03-04 | Charge control method for electrical dust controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06254438A true JPH06254438A (en) | 1994-09-13 |
Family
ID=12674534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4382593A Withdrawn JPH06254438A (en) | 1993-03-04 | 1993-03-04 | Charge control method for electrical dust controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06254438A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09253527A (en) * | 1996-03-19 | 1997-09-30 | Terumo Kogyo:Kk | Air purifier |
| JP2014226661A (en) * | 2013-05-21 | 2014-12-08 | 株式会社トルネックス | Electric dust collector for habitable room ventilation and ventilation system incorporated with the same |
-
1993
- 1993-03-04 JP JP4382593A patent/JPH06254438A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09253527A (en) * | 1996-03-19 | 1997-09-30 | Terumo Kogyo:Kk | Air purifier |
| JP2014226661A (en) * | 2013-05-21 | 2014-12-08 | 株式会社トルネックス | Electric dust collector for habitable room ventilation and ventilation system incorporated with the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000509 |