JP3478327B2 - Spark detector for electric dust collector - Google Patents
Spark detector for electric dust collectorInfo
- Publication number
- JP3478327B2 JP3478327B2 JP29695698A JP29695698A JP3478327B2 JP 3478327 B2 JP3478327 B2 JP 3478327B2 JP 29695698 A JP29695698 A JP 29695698A JP 29695698 A JP29695698 A JP 29695698A JP 3478327 B2 JP3478327 B2 JP 3478327B2
- Authority
- JP
- Japan
- Prior art keywords
- charging voltage
- spark
- threshold value
- voltage
- discharge
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気中のダストを
捕集する電気集塵装置の火花検出装置に係り、特に火花
検出装置の誤判断を防止するための、電気集塵装置の火
花検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark detection device for an electric dust collector that collects dust in the air, and more particularly to a spark detection device for an electric dust collector to prevent erroneous determination of the spark detector. Regarding the device.
【０００２】[0002]
【従来の技術】電気集塵装置は一般に、より高い荷電電
圧で運転することが装置の性能面で有利である。そのた
め通常は放電電流の定電流制御または、前記定電流制御
と荷電圧の定電圧制御方式を併用した制御装置を具備
し、無火花時は各々の制御の設定器で設定された出力上
限値で運転されている。また、コロナ放電域からアー
ク、グロー放電域への移行を防止する目的から「火花追
随制御」、「火花頻度制御」や「火花積分制御」などと
一般に呼ばれている火花発生時に行う自動制御により電
気集塵装置の荷電電圧や放電電流を制御している。2. Description of the Related Art Generally, it is advantageous in terms of the performance of an electrostatic precipitator to operate at a higher charging voltage. Therefore, it is usually equipped with a constant current control of the discharge current or a control device that uses both the constant current control and the constant voltage control method of the load voltage, and when there is no spark, the output upper limit value set by the setting device of each control is used. You are driving. In order to prevent the transition from the corona discharge area to the arc or glow discharge area, automatic control that is commonly called "spark following control", "spark frequency control", "spark integration control", etc. is performed when a spark occurs. It controls the charging voltage and discharge current of the electrostatic precipitator.
【０００３】従来の火花検出回路の動作内容を以下に説
明する。火花発生時は荷電電圧が低下する現象が発生
し、電源装置の出力側が短絡状態となるために、放電電
流が上昇する。この放電電流が予め定められた放電電流
超過検出閾値以上であることと、荷電電圧が予め定めら
れた荷電電圧低下検出閾値以下に急速に低下したことの
ＡＮＤ条件が成立した場合にのみ火花検出と判断して上
記に示す火花発生時の自動制御を行なっていた。The operation contents of the conventional spark detection circuit will be described below. When a spark is generated, a phenomenon occurs in which the charging voltage drops, and the output side of the power supply device is short-circuited, so the discharge current rises. The spark detection is performed only when the AND condition that the discharge current is equal to or higher than the predetermined discharge current excess detection threshold value and that the charging voltage is rapidly decreased to the predetermined charge voltage drop detection threshold value or less is satisfied. Judgment was made and the above-mentioned automatic control at the time of spark generation was performed.
【０００４】この火花検出回路からの信号により電気集
塵装置の電源装置を以下の２つの運転モードを状況に応
じて使い分けて制御している。なお、火花検出を判定す
る閾値は、電源装置の１つの運転モードである連続荷電
方式の場合と、サイクリックに荷電・休止を行うもう１
つの運転モードである間欠荷電方法の場合も共に同じ閾
値で設定して検出動作を行っていた。A signal from the spark detection circuit controls the power supply unit of the electrostatic precipitator by selectively using the following two operation modes according to the situation. It should be noted that the threshold for determining the spark detection is one in which the power supply device is in the continuous charging method, and another in which the charging / pausing is cyclically performed.
In the case of the intermittent charging method which is one operation mode, the detection operation is performed by setting the same threshold value.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら間欠荷電
方式の場合に於いては、荷電休止時に荷電電圧が低下す
ることと、集塵装置を再荷電する時に突入充電電流が流
れることにより、火花検出条件が成立することになるた
め、連続荷電方法の時の閾値のままであると火花検出の
誤動作が発生していた。その誤動作を防止するために従
来は放電電流超過閾値の設定値を高くして、誤動作が発
生しないように対処していた。その結果、電流値が低い
火花が頻発した場合、火花として検出できないために火
花時自動制御が機能しないので荷電電圧の低下を助長
し、最終的には電源装置、電気集塵装置を保護するため
に設けられている機能である「低電圧検出装置」が動作
し、電源装置をトリップさせる事象にまで到達してしま
う。However, in the case of the intermittent charging method, the spark detection condition is reduced due to the decrease of the charging voltage when the charging is stopped and the inrush charging current flowing when the dust collector is recharged. Therefore, if the threshold value of the continuous charging method remains unchanged, the spark detection malfunction occurs. In order to prevent the malfunction, conventionally, the set value of the discharge current excess threshold value is increased to prevent the malfunction. As a result, if a spark with a low current value occurs frequently, it will not be detected as a spark, and automatic control during sparks will not function, which will help to reduce the charging voltage and ultimately protect the power supply and electrostatic precipitator. The "low-voltage detection device", which is a function provided in, operates and reaches the event of tripping the power supply device.
【０００６】また反対に荷電電圧の設定閾値を低くした
場合には、本来検出する必要のないアーク、グロー放電
に移行しない自己消弧形の火花発生時でも自動制御して
しまう。そのために荷電一時休止時間の増加による無荷
電時間が多くなり、電気集塵装置の性能が低下する不具
合が発生していた。図３（Ａ）、（Ｂ）、（Ｃ）、
（Ｄ）に従来の火花放電阻止回路の信号処理の機能を示
す。図３（Ａ）は間欠荷電方式における、荷電電圧測定
値８０と、荷電電圧検出閾値設定器に於いて設定された
荷電電圧低下閾値８２とを時間を横軸に示した図であ
る。図３（Ａ）は時間Ｔ１までは正常なコロナ放電が発
生していたが、Ｔ１以降火花放電８４が発生して、集塵
装置の荷電電圧を遮断した例を示している。図３（Ｂ）
に示す荷電電圧低下信号８６は、図３（Ａ）に於いて荷
電電圧測定値８０が荷電電圧低下閾値８２を下まわった
荷電電圧低下判定領域８８の間だけＨｉレベルになるよ
うに作られる信号である。この荷電電圧低下信号８６は
火花放電が発生していない間であるにもかかわらずＴ
２、Ｔ３以降出力されてしまう。図３（Ｄ）に示す電力
制御指令９２は、図３（Ｂ）の荷電電圧低下信号８６と
図３（Ｃ）の放電電流超過信号９０とのＡＮＤ信号であ
り、図３（Ｃ）に示されるように放電電流超過信号９０
は集塵装置に流れる突入電流によっても出力されるた
め、火花放電が発生していない間であっても図３（Ｄ）
に示す電力制御指令９２がＴ４からＴ５の間出力されて
しまい、誤動作が発生していた。On the other hand, when the set threshold value of the charging voltage is lowered, the automatic control is performed even when an arc which should not be detected originally and a self-extinguishing type spark which does not shift to glow discharge are generated. As a result, the non-charging time is increased due to the increase in the charging suspension time, and the performance of the electrostatic precipitator deteriorates. 3 (A), (B), (C),
(D) shows the signal processing function of the conventional spark discharge prevention circuit. FIG. 3A is a diagram showing the charging voltage measurement value 80 and the charging voltage lowering threshold value 82 set by the charging voltage detection threshold value setting device on the horizontal axis in the intermittent charging method. FIG. 3A shows an example in which a normal corona discharge was generated until time T1, but a spark discharge 84 was generated after T1 and the charging voltage of the dust collector was cut off. Figure 3 (B)
The charging voltage drop signal 86 shown in FIG. 3 is a signal generated so as to be at the Hi level only during the charging voltage drop determination region 88 in which the measured charging voltage value 80 falls below the charging voltage drop threshold value 82 in FIG. Is. This charging voltage drop signal 86 is T while the spark discharge is not occurring.
2, output after T3. The power control command 92 shown in FIG. 3 (D) is an AND signal of the charging voltage drop signal 86 of FIG. 3 (B) and the discharge current excess signal 90 of FIG. 3 (C), and is shown in FIG. 3 (C). Discharge current excess signal 90
Is also output by the inrush current that flows in the dust collector, so that even if no spark discharge is occurring, the discharge current of
The power control command 92 shown in is output from T4 to T5, causing a malfunction.
【０００７】時間Ｔ１以降に出力される電力制御指令９
２は、火花放電８４による信号であるので正常な検出で
ある。本発明はこのような事情に鑑みてなされたもの
で、火花検出の誤検出及びレベルの低い火花が検出でき
ないことによる誤った電源装置のトリップを防止させる
ための電気集塵装置の火花検出装置を提供することを目
的とする。Power control command 9 output after time T1
2 is a normal detection because it is a signal by the spark discharge 84. The present invention has been made in view of the above circumstances, and provides a spark detection device for an electrostatic precipitator for preventing an erroneous detection of spark detection and an erroneous trip of a power supply device due to the inability to detect a low-level spark. The purpose is to provide.
【０００８】[0008]
【課題を解決するための手段】本発明は前記目的を達成
するために、集塵極とその集塵極に対向して配置された
放電極との間に連続又は間欠荷電方式で電圧を印加し、
排ガス中のダストを捕集する電気集塵装置の火花検出装
置において、前記集塵極と放電極との間に印加される荷
電電圧値を検出する電圧検出手段と、前記電圧検出手段
によって検出された荷電電圧値に応じて変化するように
火花発生の判定基準となる荷電電圧低下閾値を設定する
閾値設定手段と、前記電圧検出手段によって検出された
荷電電圧値と前記閾値設定手段によって設定された荷電
電圧低下閾値とを比較することにより火花発生の有無を
判定する判定手段と、を備えたことを特徴としている。In order to achieve the above-mentioned object, the present invention applies a voltage between a dust collecting electrode and a discharge electrode arranged facing the dust collecting electrode by a continuous or intermittent charging method. Then
In a spark detection device of an electrostatic precipitator that collects dust in exhaust gas, a voltage detection unit that detects a charging voltage value applied between the dust collection electrode and a discharge electrode, and the voltage detection unit detects the voltage. A threshold value setting means for setting a charging voltage lowering threshold value which is a criterion for spark generation so as to change according to the charging voltage value, the charging voltage value detected by the voltage detecting means and the threshold setting means. And a determination unit that determines whether or not a spark is generated by comparing with a charging voltage lowering threshold value.
【０００９】本発明によれば、集塵極と放電極との間に
印加される荷電電圧値を検出する電圧検出手段と、前記
電圧検出手段によって検出された荷電電圧値に応じて変
化するように火花発生の判定基準となる荷電電圧低下閾
値を設定する閾値設定手段と、前記電圧検出手段によっ
て検出された荷電電圧値と前記閾値設定手段によって設
定された荷電電圧低下閾値とを比較することにより火花
発生の有無を判定する判定手段とを備えたので確実な火
花放電の検出が可能となる。これにより集塵装置の２つ
の荷電モードである、連続荷電方式と間欠荷電方式共に
同じ荷電電圧低下閾値及び放電電流超過閾値でも誤判断
せずにレベルの低い火花も検出できるので火花発生頻度
を抑制し、更に火花頻発を防止するための無荷電時間が
短縮でき電気集塵装置の機能を向上することができる。
また、電気集塵装置の性能を左右する荷電電圧を高い値
に保持し、効率を良くすることができる。According to the present invention, the voltage detecting means for detecting the charging voltage value applied between the dust collecting electrode and the discharge electrode, and the voltage detecting means for changing according to the charging voltage value detected by the voltage detecting means. By comparing the charging voltage lowering threshold set by the threshold value setting means for setting the charging voltage lowering threshold value which is the determination criterion of the spark occurrence, the charging voltage value detected by the voltage detecting means and the threshold value setting means. Since the determination means for determining the presence or absence of spark generation is provided, it is possible to reliably detect spark discharge. As a result, it is possible to detect low-level sparks without misjudging even with the same charging voltage lowering threshold value and discharge current excess threshold value for both the continuous charging method and the intermittent charging method, which are the two charging modes of the dust collector. In addition, the non-charging time for preventing frequent sparks can be shortened, and the function of the electrostatic precipitator can be improved.
In addition, the charging voltage that affects the performance of the electrostatic precipitator can be maintained at a high value to improve efficiency.
【００１０】本発明は前記目的を達成するために請求項
２に記載の発明は、前記閾値設定手段には前記電圧検出
手段によって検出された荷電電圧値を分圧する分圧抵抗
器と、前記荷電電圧値又は分圧された電圧値を所定の時
間遅延させる遅れ要素とを有することを特徴としてい
る。本発明によれば、前記閾値設定手段には前記電圧検
出手段によって検出された荷電電圧値を分圧する分圧抵
抗器と、前記荷電電圧値又は分圧された電圧値を所定の
時間遅延させる遅れ要素とを設けたので、簡単な構成で
確実に火花放電の検出が可能となる。In order to achieve the above-mentioned object, the present invention according to claim 2 is characterized in that the threshold value setting means divides the charging voltage value detected by the voltage detecting means, and the charging resistor. And a delay element for delaying the voltage value or the divided voltage value for a predetermined time. According to the present invention, the threshold value setting means divides the charging voltage value detected by the voltage detecting means, and a delay for delaying the charging voltage value or the divided voltage value for a predetermined time. Since the elements and are provided, the spark discharge can be reliably detected with a simple configuration.
【００１１】本発明は前記目的を達成するために請求項
３に記載の発明は、前記集塵極と放電極との間を流れる
放電電流を検出する電流検出手段を有し、前記判定手段
は、前記荷電電圧値が前記荷電電圧低下閾値以下とな
り、かつ前記電流検出手段によって検出された放電電流
値が所定の放電電流超過閾値以上になったときに火花発
生があったと判別することを特徴としている。In order to achieve the above-mentioned object, the present invention according to claim 3 has a current detecting means for detecting a discharge current flowing between the dust collecting electrode and the discharge electrode, and the judging means. The charging voltage value is equal to or lower than the charging voltage lowering threshold value, and when the discharge current value detected by the current detecting unit is equal to or higher than a predetermined discharge current excess threshold value, it is determined that a spark has occurred. There is.
【００１２】本発明によれば、前記集塵極と放電極との
間を流れる放電電流を検出する電流検出手段を有し、前
記判定手段は、前記荷電電圧値が前記荷電電圧低下閾値
以下となり、かつ前記電流検出手段によって検出された
放電電流値が所定の放電電流超過閾値以上になったとき
に火花発生があったと判別するようにしたので、簡単な
構成で確実に火花放電の検出が可能となる。According to the present invention, there is provided current detecting means for detecting a discharge current flowing between the dust collecting electrode and the discharge electrode, and the judging means has the charging voltage value equal to or lower than the charging voltage lowering threshold value. Further, since it is determined that the spark has occurred when the discharge current value detected by the current detection unit becomes equal to or higher than the predetermined discharge current excess threshold value, it is possible to reliably detect the spark discharge with a simple configuration. Becomes
【００１３】[0013]
【発明の実施の形態】図１に本発明に係る電気集塵装置
の火花検出装置の実施の形態を説明する。まず、電気集
塵装置の構成について説明する。電気集塵装置１０は放
電極１１と集塵極１２から形成される集塵装置１３を動
作させるために、交流電源１４と、交流電圧を位相制御
するために用いるサイリスタ等の電力制御素子１６と、
交流電圧を集塵装置１３で利用可能な電圧に変圧するた
めの変圧器１８と、変換した交流電圧を直流に変換する
整流器２０と、荷電電圧検出手段３０と、荷電電圧低下
判定手段３２と、本発明に係る検出波形改良回路３４
と、荷電電圧低下検出閾値設定器３６と、荷電電圧低下
判定器３８と、放電電流検出手段４０と、放電電流超過
判定手段４２と、放電電流超過検出閾値設定器４６と、
放電電流超過判定器４８と、位相制御装置５０と、ＡＮ
Ｄ回路５２と、位相制御回路５４とから構成されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates an embodiment of a spark detecting device for an electrostatic precipitator according to the present invention. First, the configuration of the electrostatic precipitator will be described. The electric dust collector 10 has an AC power supply 14 for operating a dust collector 13 formed of a discharge electrode 11 and a dust collector 12, and a power control element 16 such as a thyristor used for phase-controlling an AC voltage. ,
A transformer 18 for transforming the AC voltage into a voltage that can be used in the dust collector 13, a rectifier 20 for converting the converted AC voltage into a DC, a charging voltage detecting unit 30, and a charging voltage drop determining unit 32. Detection waveform improvement circuit 34 according to the present invention
A charging voltage drop detection threshold setting unit 36, a charging voltage drop determining unit 38, a discharge current detecting unit 40, a discharge current excess determining unit 42, a discharge current excess detecting threshold setting unit 46,
Discharge current excess determiner 48, phase control device 50, AN
It is composed of a D circuit 52 and a phase control circuit 54.
【００１４】次に、電気集塵装置１０の各部に於ける機
能及び動作について説明する。交流電源１４から得られ
る電力は、集塵装置１３へ供給するのに適した電力とな
るように位相制御装置５０からの指令に従って電力制御
素子１６により位相制御される。更に変圧器１８により
電圧が昇圧された後に整流器２０により直流へと変換さ
れ、集塵装置１３の放電極１１に印加されて放電極１１
と集塵極１２との間でコロナ放電を開始し、集塵運転さ
れている。このとき放電極１１と集塵極１２との間に印
加されている荷電電圧は例えば分圧抵抗器を使用した荷
電電圧検出手段３０の出力として常に監視されている。
そして放電極１１と集塵極１２との間に流れている放電
電流も例えば分流抵抗器を使用した放電電流検出手段４
０の出力として常に監視されている。Next, the function and operation of each part of the electrostatic precipitator 10 will be described. The electric power obtained from the AC power supply 14 is phase-controlled by the electric power control element 16 in accordance with a command from the phase control device 50 so that the electric power is suitable for being supplied to the dust collector 13. Further, after the voltage is boosted by the transformer 18, it is converted into direct current by the rectifier 20 and applied to the discharge electrode 11 of the dust collector 13 to discharge the discharge electrode 11.
The corona discharge is started between the dust collecting electrode 12 and the dust collecting electrode 12, and the dust collecting operation is performed. At this time, the charging voltage applied between the discharge electrode 11 and the dust collecting electrode 12 is constantly monitored as the output of the charging voltage detecting means 30 using a voltage dividing resistor, for example.
The discharge current flowing between the discharge electrode 11 and the dust collecting electrode 12 is also the discharge current detecting means 4 using, for example, a shunt resistor.
It is constantly monitored as an output of zero.
【００１５】もし集塵装置１３内の放電極１１と集塵極
１２間で火花放電が発生した場合には、放電電流が瞬時
に急増するとともに荷電電圧が降下する。このときに荷
電電圧検出手段３０と放電電流検出手段４０に於いて検
出された荷電電圧測定値６０と放電電流測定値は荷電電
圧低下判定手段３２と放電電流超過判定手段４２で読み
取り、供給する電力を減らすように電力制御素子１６を
制御する。放電電流超過判定手段４２に於いては、予め
放電電流超過閾値設定器４６により設定されている放電
電流の閾値よりも放電電流測定値が大きいかどうかを放
電電流超過判定器４８が判定している。検出した放電電
流測定値が閾値よりも大きい場合には放電電流超過を示
す信号を位相制御装置５０のＡＮＤ回路５２に出力す
る。また、荷電電圧低下判定手段３２に於いては、検出
した荷電電圧測定値６０を検出波形改良回路３４を通し
た値と、予め荷電電圧低下検出閾値設定器３６により設
定されている荷電電圧の閾値とを加えた値である荷電電
圧低下閾値６２と、検出した荷電電圧測定値６０とを荷
電電圧低下判定器３８で比較判定している。ここで前記
荷電電圧低下閾値６２よりも検出した荷電電圧測定値６
０の方が低い場合には荷電電圧低下を示す信号を位相制
御装置５０のＡＮＤ回路５２に出力する。このようにし
て得られた放電電流超過信号７０と、荷電電圧低下信号
６６が同時に位相制御装置５０のＡＮＤ回路５２に入力
された場合にはＡＮＤ回路５２は電力制御指令を位相制
御回路５４に出力し、その電力制御指令に応じて位相制
御回路５４は電力制御指令を電力制御素子１６に出力し
て集塵装置１３に印加される電力が制御される。例えば
集塵装置１３に於ける火花発生時の持続放電を防止する
ために、瞬時に電力制御素子１６のゲートをオフ（荷電
停止）して一定時間経過後に火花発生時の荷電電圧まで
徐々に復帰するような火花時自動制御回路を構成する。
これにより常時適切な放電状態を維持することが可能と
なる。また、放電極１１の断線または、異物混入により
放電極１１と集塵極１２が短絡した場合等には、荷電電
圧が徐々に低下しコロナ開始電圧以下の状態が一定時間
以上継続したことを荷電電圧検出手段３０が出力するこ
とにより、前記の火花時自動制御回路が動作して電力制
御素子１６のゲートをオフさせるかまたは交流電源１４
を遮断させるように図示しない保護回路が構成されてい
る。If a spark discharge occurs between the discharge electrode 11 and the dust collecting electrode 12 in the dust collector 13, the discharge current instantly increases rapidly and the charging voltage drops. At this time, the charge voltage measurement value 60 and the discharge current measurement value detected by the charge voltage detection means 30 and the discharge current detection means 40 are read by the charge voltage drop determination means 32 and the discharge current excess determination means 42, and the supplied power is supplied. The power control element 16 is controlled so as to reduce In the discharge current excess determination means 42, the discharge current excess determination device 48 determines whether or not the discharge current measurement value is larger than the discharge current threshold value set in advance by the discharge current excess threshold value setting device 46. . When the detected discharge current measurement value is larger than the threshold value, a signal indicating the discharge current excess is output to the AND circuit 52 of the phase controller 50. Further, in the charging voltage drop determining means 32, the detected charging voltage measurement value 60 is passed through the detection waveform improving circuit 34 and the charging voltage threshold value preset by the charging voltage drop detection threshold value setting device 36. The charging voltage drop threshold 62, which is a value obtained by adding and, and the detected charging voltage measurement value 60 are compared and determined by the charging voltage drop determiner 38. Here, the charging voltage measured value 6 detected from the charging voltage lowering threshold value 62
When 0 is lower, a signal indicating a decrease in charging voltage is output to the AND circuit 52 of the phase controller 50. When the discharge current excess signal 70 thus obtained and the charging voltage reduction signal 66 are simultaneously input to the AND circuit 52 of the phase control device 50, the AND circuit 52 outputs a power control command to the phase control circuit 54. Then, according to the power control command, the phase control circuit 54 outputs the power control command to the power control element 16 to control the power applied to the dust collector 13. For example, in order to prevent continuous discharge at the time of spark generation in the dust collector 13, the gate of the power control element 16 is instantly turned off (charging stopped), and after a certain period of time, the charge voltage at the time of spark generation is gradually restored. Configure an automatic control circuit for such a spark.
This makes it possible to always maintain an appropriate discharge state. In addition, when the discharge electrode 11 and the dust collecting electrode 12 are short-circuited due to the disconnection of the discharge electrode 11 or the inclusion of foreign matter, the charging voltage is gradually decreased, and the state that the voltage is equal to or lower than the corona start voltage is continued for a certain time or longer. By the output of the voltage detection means 30, the spark automatic control circuit operates to turn off the gate of the power control element 16 or the AC power supply 14
A protection circuit (not shown) is configured to shut off the power supply.
【００１６】上記の例では荷電電圧低下判定手段３２
や、放電電流超過判定手段４２や、位相制御装置５０に
ハードウェアを用いた例で説明しているが、Ａ−Ｄ変換
器等でデータを読み込んでソフトウェアで判定や制御の
処理を行ってもよい。本発明に係る電気集塵装置の火花
検出装置は、荷電電圧低下判定手段３２内に検出波形改
良回路３４を追加することによって火花検出精度の向上
を図るものである。In the above example, the charging voltage drop determining means 32
Alternatively, the discharge current excess determination means 42 and the phase control device 50 are described as an example in which hardware is used. However, even if data is read by an A / D converter or the like and determination or control processing is performed by software. Good. The spark detecting device for an electrostatic precipitator according to the present invention is intended to improve the spark detection accuracy by adding a detection waveform improving circuit 34 in the charging voltage drop determining means 32.
【００１７】図２（Ａ）、（Ｂ）、（Ｃ）、（Ｄ）に検
出波形改良回路３４の信号処理機能について示す。図２
（Ａ）は間欠荷電方式における、荷電電圧検出手段３０
にて検出した荷電電圧測定値６０と、前記荷電電圧測定
値６０を検出波形改良回路３４を通過したのちに荷電電
圧低下検出閾値設定器３６にて設定された荷電電圧低下
閾値６２とを時間を横軸に示した図である。図２（Ａ）
は時間Ｔ１までは正常なコロナ放電が発生していたが、
Ｔ１以降火花放電６４が発生して、集塵装置１３の荷電
電圧を電力制御素子１６に指令を出力して遮断した例を
示している。本発明によれば、荷電電圧測定値６０に応
じて荷電電圧低下閾値６２が追従して変化するので図２
（Ｂ）に示す荷電電圧低下判定器３８から出力されてい
る荷電電圧低下信号６６は火花放電が発生しない間はＬ
ｏレベルのままである。従って、図２（Ｃ）に於ける放
電電流超過信号７０が放電電流超過判定器４８から出力
されていても図２（Ｄ）に示す電力制御指令７２は火花
放電が発生しない間はＬｏレベルのままとなり誤動作は
起こらない。2A, 2B, 2C and 2D show the signal processing function of the detection waveform improving circuit 34. As shown in FIG. Figure 2
(A) is a charging voltage detecting means 30 in the intermittent charging system.
The charging voltage measurement value 60 detected by the charging voltage measurement value 60 and the charging voltage reduction threshold value 62 set by the charging voltage reduction detection threshold value setting device 36 after passing through the detection voltage improvement circuit 34 It is the figure shown on the horizontal axis. Figure 2 (A)
Had a normal corona discharge until time T1,
An example is shown in which the spark discharge 64 is generated after T1 and the charging voltage of the dust collector 13 is cut off by outputting a command to the power control element 16. According to the present invention, the charging voltage lowering threshold 62 changes following the charging voltage measured value 60.
The charge voltage drop signal 66 output from the charge voltage drop determiner 38 shown in (B) is L while the spark discharge is not generated.
It remains at the o level. Therefore, even if the discharge current excess signal 70 in FIG. 2 (C) is output from the discharge current excess determiner 48, the power control command 72 shown in FIG. 2 (D) is at Lo level while the spark discharge does not occur. As it is, no malfunction occurs.
【００１８】時間Ｔ１に於いて火花放電６４が発生した
場合には、荷電電圧測定値６０が火花放電６４により低
下するが、検出波形改良回路３４の働きにより荷電電圧
低下閾値６２は追従が遅れるために図２（Ａ）の荷電電
圧低下判定領域６８の部分に於いて、荷電電圧低下信号
６６＝荷電電圧低下閾値６２−荷電電圧測定値６０が正
の値をとる。従って、図２（Ｂ）に示す荷電電圧低下信
号６６が火花放電６４の発生と同時に検出波形改良回路
３４の時定数の時間の間出力される。この荷電電圧低下
信号６６と、図２（Ｃ）に示す放電電流超過信号７０と
のＡＮＤ演算をＡＮＤ回路５２で行うことにより、図２
（Ｄ）に示す電力制御指令７２が得られる。When the spark discharge 64 occurs at the time T1, the measured value 60 of the charging voltage is lowered by the spark discharge 64, but the detection waveform improving circuit 34 works to delay the follow-up of the charging voltage lowering threshold 62. 2A, the charging voltage drop signal 66 = charging voltage drop threshold 62−charging voltage measurement value 60 takes a positive value in the charging voltage drop determination area 68. Therefore, the charging voltage drop signal 66 shown in FIG. 2B is output during the time of the time constant of the detection waveform improving circuit 34 at the same time when the spark discharge 64 is generated. The AND circuit 52 performs an AND operation on the charging voltage drop signal 66 and the discharge current excess signal 70 shown in FIG.
The power control command 72 shown in (D) is obtained.
【００１９】上記のように本発明によれば、集塵極１２
と放電極１１間に発生する火花の検出が確実になるの
で、レベルの低い火花を検出できないことによる不要な
電源装置のトリップ防止を図ることができる。なお、図
１の説明では検出波形改良回路３４は、１次のローパス
フィルタで形成しているが、本発明はこれに限定される
ものではなく多次のフィルタを形成してもよいし、比例
動作と定数を加算した回路であっても目的は達成され
る。また、検出波形改良回路３４を設ける場所も荷電電
圧低下判定手段３２の内部及び放電電流超過判定手段４
２の少なくとも何れか一方に設けることにより目的は達
成される。例えば、多次の遅れ要素を荷電電圧低下閾値
６２の信号経路に設けても本発明の目的は達成される。
また、位相制御装置５０の内部に遅延回路等を設けるこ
とによっても本発明の目的は達成される。As described above, according to the present invention, the dust collecting electrode 12
Since the spark generated between the discharge electrode 11 and the discharge electrode 11 is reliably detected, it is possible to prevent unnecessary tripping of the power supply device due to the inability to detect the low-level spark. In the description of FIG. 1, the detection waveform improving circuit 34 is formed by a first-order low-pass filter, but the present invention is not limited to this, and a multi-order filter may be formed, or a proportional filter. The object can be achieved even with a circuit in which an operation and a constant are added. Further, the place where the detection waveform improving circuit 34 is provided is also inside the charging voltage drop judging means 32 and the discharge current excess judging means 4
The object can be achieved by providing at least one of the two. For example, a multi-order lag element may be provided in the signal path of the charging voltage drop threshold 62 to achieve the object of the present invention.
The object of the present invention can also be achieved by providing a delay circuit or the like inside the phase control device 50.
【００２０】[0020]
【発明の効果】以上説明したように、本発明に係る電気
集塵装置の火花検出装置によれば、集塵極と放電極との
間に印加される荷電電圧値を検出する電圧検出手段と、
前記電圧検出手段によって検出された荷電電圧値に応じ
て変化するように火花発生の判定基準となる荷電電圧低
下閾値を設定する閾値設定手段と、前記電圧検出手段に
よって検出された荷電電圧値と前記閾値設定手段によっ
て設定された荷電電圧低下閾値とを比較することにより
火花発生の有無を判定する判定手段とを備えたので確実
な火花放電の検出が可能となる。これにより集塵装置の
２つの荷電モードである、連続荷電方式と間欠荷電方式
共に同じ荷電電圧低下閾値及び放電電流超過閾値でも誤
判断せずにレベルの低い火花も検出できるので火花発生
頻度を抑制し、更に火花頻発を防止するための無荷電時
間が短縮でき電気集塵装置の機能を向上することができ
る。また、電気集塵装置の性能を左右する荷電電圧を高
い値に保持し、効率を良くすることができる。As described above, according to the spark detecting device of the electrostatic precipitator according to the present invention, the voltage detecting means for detecting the charging voltage value applied between the dust collecting electrode and the discharge electrode is provided. ,
Threshold setting means for setting a charging voltage lowering threshold serving as a determination criterion of spark generation so as to change according to the charging voltage value detected by the voltage detecting means, and the charging voltage value detected by the voltage detecting means and the Since the determination means for determining the presence / absence of spark by comparing with the charging voltage lowering threshold set by the threshold setting means is provided, it is possible to reliably detect the spark discharge. As a result, it is possible to detect low-level sparks without misjudging even with the same charging voltage lowering threshold value and discharge current excess threshold value for both the continuous charging method and the intermittent charging method, which are the two charging modes of the dust collector. In addition, the non-charging time for preventing frequent sparks can be shortened, and the function of the electrostatic precipitator can be improved. In addition, the charging voltage that affects the performance of the electrostatic precipitator can be maintained at a high value to improve efficiency.
【００２１】また他の発明の形態によれば、前記閾値設
定手段には前記電圧検出手段によって検出された荷電電
圧値を分圧する分圧抵抗器と、前記荷電電圧値又は分圧
された電圧値を所定の時間遅延させる遅れ要素とを設け
たので、簡単な構成で確実に火花放電の検出が可能とな
る。また他の発明の形態によれば、前記集塵極と放電極
との間を流れる放電電流を検出する電流検出手段を有
し、前記判定手段は、前記荷電電圧値が前記荷電電圧低
下閾値以下となり、かつ前記電流検出手段によって検出
された放電電流値が所定の放電電流超過閾値以上になっ
たときに火花発生があったと判別するようにしたので、
簡単な構成で確実に火花放電の検出が可能となる。According to another aspect of the invention, the threshold value setting means includes a voltage dividing resistor for dividing the charging voltage value detected by the voltage detecting means, and the charging voltage value or the divided voltage value. Since the delay element that delays the predetermined time is provided, it is possible to reliably detect the spark discharge with a simple configuration. According to another aspect of the invention, the current detection unit has a current detection unit that detects a discharge current flowing between the dust collection electrode and the discharge electrode, and the determination unit has the charging voltage value equal to or lower than the charging voltage reduction threshold value. And, since the discharge current value detected by the current detection means becomes equal to or higher than a predetermined discharge current excess threshold, it is determined that a spark has occurred,
It is possible to reliably detect spark discharge with a simple configuration.
【図１】本発明に係る電気集塵装置の火花検出装置の実
施の形態を示す図FIG. 1 is a diagram showing an embodiment of a spark detection device for an electrostatic precipitator according to the present invention.
【図２】（Ａ）は本発明に係る電気集塵装置による信号
処理を示す図
（Ｂ）は本発明に係る荷電電圧低下信号の出力状態を示
す図
（Ｃ）は本発明に係る放電電流超過信号の出力状態を示
す図
（Ｄ）は本発明に係る電力制御指令信号の出力状態を示
す図2A is a diagram showing signal processing by the electrostatic precipitator according to the present invention, FIG. 2B is a diagram showing an output state of a charging voltage drop signal according to the present invention, and FIG. 2C is a discharge current according to the present invention. The figure which shows the output state of an excess signal is a figure which shows the output state of the power control command signal which concerns on this invention.
【図３】（Ａ）は従来の電気集塵装置による信号処理を
示す図
（Ｂ）は従来の荷電電圧低下信号の出力状態を示す図
（Ｃ）は従来の放電電流超過信号の出力状態を示す図
（Ｄ）は従来の電力制御指令信号の出力状態を示す図FIG. 3A shows a signal processing by a conventional electrostatic precipitator, FIG. 3B shows an output state of a conventional charging voltage drop signal, and FIG. 3C shows an output state of a conventional discharge current excess signal. The figure (D) which shows the output state of the conventional electric power control command signal
１０…電気集塵装置 １１…放電極 １２…集塵極 １３…集塵装置 ３０…荷電電圧検出手段 ３２…荷電電圧低下判定手段 ３４…検出波形改良回路 ３８…荷電電圧低下判定器 ６２…荷電電圧低下閾値 ６４…火花放電 10 ... Electrostatic precipitator 11 ... Discharge electrode 12 ... dust collector 13 ... Dust collector 30 ... Charging voltage detecting means 32 ... Charging voltage drop determining means 34 ... Detection waveform improving circuit 38 ... Charge voltage drop determining device 62 ... Charging voltage reduction threshold 64 ... Spark discharge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高藤 一明 千葉県松戸市上本郷537番地 株式会社 日立プラント建設機電エンジニアリング 内 (56)参考文献 実開 昭51−77673（ＪＰ，Ｕ) 実開 昭52−59984（ＪＰ，Ｕ) 実開 昭59−131254（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B03C 3/00 - 3/88 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Takafuji 537 Uemotogo, Matsudo-shi, Chiba Hitachi Plant Construction Machinery & Engineering Co., Ltd. (56) References: 51-77673 -59984 (JP, U) Actual development Sho 59-131254 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) B03C 3/00-3/88
Claims (3)
た放電極との間に連続又は間欠荷電方式で電圧を印加
し、排ガス中のダストを捕集する電気集塵装置の火花検
出装置において、 前記集塵極と放電極との間に印加される荷電電圧値を検
出する電圧検出手段と、 前記電圧検出手段によって検出された荷電電圧値に応じ
て変化するように火花発生の判定基準となる荷電電圧低
下閾値を設定する閾値設定手段と、 前記電圧検出手段によって検出された荷電電圧値と前記
閾値設定手段によって設定された荷電電圧低下閾値とを
比較することにより火花発生の有無を判定する判定手段
と、 を備えたことを特徴とする電気集塵装置の火花検出装
置。1. An electrostatic precipitator for collecting dust in exhaust gas by applying a voltage between the dust collecting electrode and a discharge electrode arranged opposite to the dust collecting electrode by a continuous or intermittent charging method. In the spark detection device, a voltage detection means for detecting a charging voltage value applied between the dust collecting electrode and the discharge electrode, and a spark generation so as to change according to the charging voltage value detected by the voltage detection means. Threshold value setting means for setting the charging voltage lowering threshold value that is the criterion for the determination, and the occurrence of sparks by comparing the charging voltage value detected by the voltage detecting means and the charging voltage lowering threshold value set by the threshold value setting means. A spark detecting device for an electrostatic precipitator, comprising: a determining unit for determining the presence or absence.
によって検出された荷電電圧値を分圧する分圧抵抗器
と、前記荷電電圧値又は分圧された電圧値を所定の時間
遅延させる遅れ要素とを有することを特徴とする請求項
１の電気集塵装置の火花検出装置。2. The threshold value setting means divides a charging voltage value detected by the voltage detecting means by a voltage dividing resistor, and a delay element delays the charging voltage value or the divided voltage value by a predetermined time. The spark detecting device for an electrostatic precipitator according to claim 1, further comprising:
電流を検出する電流検出手段を有し、前記判定手段は、
前記荷電電圧値が前記荷電電圧低下閾値以下となり、か
つ前記電流検出手段によって検出された放電電流値が所
定の放電電流超過閾値以上になったときに火花発生があ
ったと判別することを特徴とする請求項１又は２の電気
集塵装置の火花検出装置。3. A current detecting means for detecting a discharge current flowing between the dust collecting electrode and the discharge electrode, wherein the determining means comprises:
It is characterized in that it is determined that a spark has occurred when the charging voltage value is equal to or lower than the charging voltage lowering threshold value and the discharge current value detected by the current detecting unit is equal to or higher than a predetermined discharge current excess threshold value. A spark detection device for an electrostatic precipitator according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29695698A JP3478327B2 (en) | 1998-10-19 | 1998-10-19 | Spark detector for electric dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29695698A JP3478327B2 (en) | 1998-10-19 | 1998-10-19 | Spark detector for electric dust collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000117146A JP2000117146A (en) | 2000-04-25 |
| JP3478327B2 true JP3478327B2 (en) | 2003-12-15 |
Family
ID=17840372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29695698A Expired - Fee Related JP3478327B2 (en) | 1998-10-19 | 1998-10-19 | Spark detector for electric dust collector |
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| Country | Link |
|---|---|
| JP (1) | JP3478327B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004015090A1 (en) * | 2004-03-25 | 2005-11-03 | Hüttinger Elektronik Gmbh + Co. Kg | Arc discharge detection device |
| DE502006005363D1 (en) | 2006-11-23 | 2009-12-24 | Huettinger Elektronik Gmbh | A method of detecting an arc discharge in a plasma process and arc discharge detection device |
| US7795817B2 (en) | 2006-11-24 | 2010-09-14 | Huettinger Elektronik Gmbh + Co. Kg | Controlled plasma power supply |
| EP1928009B1 (en) | 2006-11-28 | 2013-04-10 | HÜTTINGER Elektronik GmbH + Co. KG | Arc detection system, plasma power supply and arc detection method |
| EP1933362B1 (en) | 2006-12-14 | 2011-04-13 | HÜTTINGER Elektronik GmbH + Co. KG | Arc detection system, plasma power supply and arc detection method |
| ATE493749T1 (en) | 2007-03-08 | 2011-01-15 | Huettinger Elektronik Gmbh | METHOD AND DEVICE FOR SUPPRESSING ARC DISCHARGES DURING OPERATING A PLASMA PROCESS |
| US8216341B2 (en) | 2008-11-12 | 2012-07-10 | Babcock & Wilcox Power Generation Group, Inc. | System and method for locating sparks in electrostatic precipitators |
| CA2772390C (en) * | 2011-04-05 | 2015-01-06 | Alstom Technology Ltd. | Method and system for discharging an electrostatic precipitator |
| WO2018150876A1 (en) | 2017-02-14 | 2018-08-23 | パナソニックＩｐマネジメント株式会社 | Arc detection circuit, switch system, power conditioner system and arc detection method |
| CN110152887B (en) * | 2019-04-30 | 2020-06-16 | 东南大学 | Constant-current intermediate-frequency dust removal power supply spark flashover detection processing system based on FPGA |
-
1998
- 1998-10-19 JP JP29695698A patent/JP3478327B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000117146A (en) | 2000-04-25 |
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