EP0534950B1 - Process for controlling the current supply device of an electrofilter - Google Patents

Process for controlling the current supply device of an electrofilter Download PDF

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Publication number
EP0534950B1
EP0534950B1 EP90905427A EP90905427A EP0534950B1 EP 0534950 B1 EP0534950 B1 EP 0534950B1 EP 90905427 A EP90905427 A EP 90905427A EP 90905427 A EP90905427 A EP 90905427A EP 0534950 B1 EP0534950 B1 EP 0534950B1
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Prior art keywords
filter
current
process according
voltage
measuring
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EP90905427A
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German (de)
French (fr)
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EP0534950A1 (en
Inventor
Gerhard Dönig
Roland HÜMPFNER
Norbert Grass
Hans-Joachim Knaak
Franz Neulinger
Helmut Schummer
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Siemens AG
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Siemens AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/903—Precipitators

Definitions

  • the invention relates to a control method for the power supply device of an electrostatic filter.
  • Power supply devices which consist of an intermediate circuit converter equipped with a measuring and control unit with a downstream high-voltage transformer are, for. B. from DE-OS 35 22 569 known.
  • a serious disadvantage of the previously known control methods is the necessity to determine the filter current and the filter voltage on the secondary side, ie. H. on the high voltage side of the transformer. Measuring devices for measuring under high voltage are expensive and prone to failure. In addition, extensive shielding and insulation measures must be taken to ensure safety for the operating personnel.
  • the determination of secondary-side conditions is indispensable, since the electrostatic filter should be controlled as optimally as possible and for this purpose a constant adjustment of the setpoints, e.g. B. for the intermediate circuit current, is necessary.
  • the object of the present invention is to avoid the secondary measurement at high voltage.
  • Another object of the invention is to accelerate and automate the target value specification so that the electrostatic filter is optimally controlled and environmental protection requirements are thereby met.
  • Automation is also intended to save personnel costs.
  • actual values e.g. B. the primary voltage, measured, it is u.
  • setpoints actual values and setpoints, links between actual and setpoints, or combinations thereof.
  • the secondary-side actual values are calculated from the primary-side actual values of voltage and current, and the electrostatic filter is hereby checked for filter breakdown and filter short-circuit.
  • the electrostatic filter can be operated with direct current, with current pulses or with a combination of both.
  • the Breaks between two pulses created several small measuring pulses in order to be able to measure sensible values on the primary side even during the pulse breaks.
  • a filter characteristic curve is recorded, this filter characteristic curve is evaluated, and new setpoints, e.g. B. for the DC link current.
  • the new setpoints are calculated in an automation unit that is superior to the measuring and control unit.
  • the FIG shows schematically an arrangement for carrying out the control process and the management process for specifying the setpoint.
  • An intermediate circuit converter 2 equipped with a measuring and control unit 1 feeds a high-voltage transformer 3, the output voltage of which is applied to an electrostatic filter 5 via a rectifier 4.
  • the measuring and control unit 1 is connected to a higher-level automation unit 6.
  • the higher-level automation unit 6 can, for. B. a programmable logic controller (Siemens S5) or a personal computer.
  • the measuring and control unit 1 measures or determines continuously - z. B. every millisecond - DC link current and primary voltage on the primary side and determines the filter current and filter voltage from these variables.
  • the filter voltage from one measurement or calculation to the other from a value above a predetermined, changeable minimum value, z. B. 5 kV, less than a predetermined, variable percentage, for. B. 25% it is detected on filter breakdown. If the filter voltage is within a predefined, changeable breakdown waiting time between 0 and 200 ms, e.g. B. 100 ms, increases again above this percentage, the counter for self-extinguishing breakthroughs is increased by one in the measuring and control unit 1. Otherwise, the counter for non-self-extinguishing breakthroughs is increased by one and a deionization reaction is initiated. The filter 5 is then recharged.
  • a filter current flows which is greater than a predetermined, variable minimum current, for. B. 10% of the maximum current, is detected on filter short circuit and the power supply in the intermediate circuit of the intermediate circuit converter 2 for a predetermined, variable waiting time of z. B. locked for 500 ms.
  • the time of the filter short circuit is also saved.
  • the filter 5 is then recharged. Exceeds the number of filter short circuits during a predetermined, changeable period of time, e.g. B. a minute, a predetermined, changeable maximum number, e.g. B. 10, it is recognized for permanent short-circuit and the electrostatic filter 5 is switched off.
  • the filter characteristic curve is represented as a function of the filter voltage as a function of the filter current. If the electrostatic filter is operated with current pulses, the filter voltage as a function of time is shown as the filter characteristic.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Protection Of Static Devices (AREA)
  • Networks Using Active Elements (AREA)
  • Ac-Ac Conversion (AREA)
  • Protection Of Transformers (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A filter short circuit is detected when the primary voltage of the high-voltage transformer drops below a specified minimum value and does not rise above the specified minimum value during a specified delay period and a filter current is greater than a specified minimum current. No current is drawn from the external current supply for a variable time delay when a filter short circuit is detected. A filter short circuit count is incremented when a filter short circuit is detected. When the count exceeds a specified, variable limit within a specified, variable time span, the indirect converter is disconnected.

Description

Die Erfindung betrifft ein Regelverfahren für die Stromversorgungseinrichtung eines Elektrofilters.The invention relates to a control method for the power supply device of an electrostatic filter.

Stromversorgungseinrichtungen die aus einem mit einer Meß- und Steuereinheit ausgestatteten Zwischenkreisumrichter mit nachgeschaltetem Hochspannungstransformator bestehen sind z. B. aus der DE-OS 35 22 569 bekannt. Ein gravierender Nachteil der bisher bekannten Regelverfahren ist die Notwendigkeit, zur Ermittlung sekundärseitiger Zustände den Filterstrom und die Filterspannung sekundärseitig, d. h. auf der Hochspannungsseite des Transformators, zu messen. Meßgeräte zur Messung unter Hochspannung sind teuer und störanfällig. Zudem müssen umfangreiche Abschirmungs- und Isolierungsmaßnahmen getroffen werden, um die Sicherheit für das Betriebspersonal zu gewährleisten. Andererseits ist die Ermittlung sekundärseitiger Zustände unabdingbar, da das Elektrofilter möglichst optimal ausgesteuert werden soll und hierzu eine ständige Anpassung der Sollwerte, z. B. für den Zwischenkreisstrom, nötig ist.Power supply devices which consist of an intermediate circuit converter equipped with a measuring and control unit with a downstream high-voltage transformer are, for. B. from DE-OS 35 22 569 known. A serious disadvantage of the previously known control methods is the necessity to determine the filter current and the filter voltage on the secondary side, ie. H. on the high voltage side of the transformer. Measuring devices for measuring under high voltage are expensive and prone to failure. In addition, extensive shielding and insulation measures must be taken to ensure safety for the operating personnel. On the other hand, the determination of secondary-side conditions is indispensable, since the electrostatic filter should be controlled as optimally as possible and for this purpose a constant adjustment of the setpoints, e.g. B. for the intermediate circuit current, is necessary.

Wegen der vorstehend beschriebenen Hochspannungsprobleme erfolgte bisher die Sollwertvorgabe für Werte wie z.B. Zwischenkreisstrom, Pulswiederholfrequenz oder Pulsdauer dadurch, daß die Filterkennlinie gemessen wurde und mit Hilfe dieser Messung aufgrund der Erfahrung des Bedienpersonals neue Sollwerte manuell vorgegeben wurden.Because of the high-voltage problems described above, the setpoint specification for values such as e.g. DC link current, pulse repetition frequency or pulse duration by measuring the filter characteristic and using this measurement based on the experience of the operating personnel, new setpoints were manually specified.

Diese Art der Sollwertvorgabe hat Nachteile: Ihre Zuverlässigkeit und Genauigkeit ist von Erfahrung und Aufmerksamkeit des Bedienpersonals abhängig, und sie führt zu hohen Personalkosten.This type of setpoint specification has disadvantages: its reliability and accuracy depends on the experience and attentiveness of the operating personnel, and it leads to high personnel costs.

Insbesondere wegen verschärfter Umweltgesetze (z. B. TA Luft) ist es nötig, das Elektrofilter optimal zu betreiben. Da sich die Durchschlagsspannung des Filters während des Betriebes ändert, müssen für einen optimalen Betrieb die Sollwerte immer wieder neu bestimmt und angepaßt werden. Aufgrund der Schnelligkeit der Änderung der Durchschlagsspannung ist eine ständige Sollwertanpassung auch für geschultes Personal nicht möglich.Particularly because of stricter environmental laws (e.g. TA Luft), it is necessary to operate the electrostatic filter optimally. Since the breakdown voltage of the filter changes during operation, the setpoints have to be determined and adjusted again and again for optimal operation. Due to the rapid change in the breakdown voltage, a constant setpoint adjustment is not possible even for trained personnel.

Aus der DE-A-1 557 061 ist es bekannt, den primärseitigen Strom zu messen, um über einen primärseitig angeordneten Magnetverstärker die dem Elektrofilter zugeführte Betriebsspannung zu steuern.From DE-A-1 557 061 it is known to measure the primary current in order to control the operating voltage supplied to the electrostatic filter via a magnetic amplifier arranged on the primary side.

Aufgabe der vorliegenden Erfindung ist, das sekundärseitige Messen bei Hochspannung zu vermeiden. Eine weitere Aufgabe der Erfindung besteht darin, die Sollwertvorgabe zu beschleunigen und zu automatisieren, so daß das Elektrofilter optimal gesteuert und dadurch Umweltschutzauflagen erfüllt werden. Insbesondere soll aus Gründen der Wirtschaftlichkeit die Nachrüstung existierender Anlagen mit dem erfindungsgemäßen Regelverfahren möglich sein. Ferner sollen durch die Automatisierung Personalkosten eingespart werden.The object of the present invention is to avoid the secondary measurement at high voltage. Another object of the invention is to accelerate and automate the target value specification so that the electrostatic filter is optimally controlled and environmental protection requirements are thereby met. In particular, for reasons of economy, it should be possible to retrofit existing systems with the control method according to the invention. Automation is also intended to save personnel costs.

Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The object is solved by the features of claim 1.

Im Regelfall werden hierbei primärseitig Istwerte, z. B. die Primärspannung, gemessen, es ist u. U. aber auch sinnvoll, Sollwerte, Istwerte und Sollwerte, Verknüpfungen von Ist- und Sollwerten oder Kombinationen hiervon zu messen.As a rule, actual values, e.g. B. the primary voltage, measured, it is u. However, it may also make sense to measure setpoints, actual values and setpoints, links between actual and setpoints, or combinations thereof.

In einer vorteilhaften Ausgestaltung des Regelverfahrens werden aus den primärseitigen Istwerten von Spannung und Strom die sekundärseitigen Istwerte berechnet und hiermit das Elektrofilter auf Filterdurchschlag und Filterkurzschluß überprüft.In an advantageous embodiment of the control method, the secondary-side actual values are calculated from the primary-side actual values of voltage and current, and the electrostatic filter is hereby checked for filter breakdown and filter short-circuit.

Das Elektrofilter kann hierbei mit Gleichstrom, mit Strompulsen oder mit einer Kombination von beidem betrieben werden. Bei mit Strompulsen betriebenen Elektrofiltern werden in den Pausen zwischen zwei Pulsen mehrere kleine Meßpulse angelegt, um auch in den Pulspausen primärseitig sinnvolle Werte messen zu können.The electrostatic filter can be operated with direct current, with current pulses or with a combination of both. In the case of electrostatic filters operated with current pulses, the Breaks between two pulses created several small measuring pulses in order to be able to measure sensible values on the primary side even during the pulse breaks.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung wird eine Filterkennlinie aufgenommen, diese Filterkennlinie ausgewertet, und aufgrund der Auswertung der Filterkennlinie neue Sollwerte, z. B. für den Zwischenkreisstrom, bestimmt. Die Berechnung der neuen Sollwerte erfolgt in einer der Meß- und Steuereinheit übergeordneten Automatisiereinheit.In a further advantageous embodiment of the invention, a filter characteristic curve is recorded, this filter characteristic curve is evaluated, and new setpoints, e.g. B. for the DC link current. The new setpoints are calculated in an automation unit that is superior to the measuring and control unit.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels und in Verbindung mit den weiteren Einzelansprüchen.Further advantages and details emerge from the following description of an exemplary embodiment and in conjunction with the further individual claims.

Die FIG zeigt schematisch eine Anordnung zur Durchführung des Regelverfahrens und des Führungsverfahrens zur Sollwertvorgabe.The FIG shows schematically an arrangement for carrying out the control process and the management process for specifying the setpoint.

Ein mit einer Meß- und Steuereinheit 1 ausgestatteter Zwischenkreisumrichter 2 speist einen Hochspannungstransformator 3, dessen Ausgangsspannung über einen Gleichrichter 4 an ein Elektrofilter 5 angelegt ist. Die Meß- und Steuereinheit 1 ist mit einer übergeordneten Automatisiereinheit 6 verbunden. Die übergeordnete Automatisiereinheit 6 kann z. B. eine speicherprogram mierbare Steuerung (Siemens S5) oder ein Personalcomputer sein. Die Meß- und Steuereinheit 1 mißt oder bestimmt kontinuierlich - z. B. jede Millisekunde - primärseitig Zwischenkreisstrom und Primärspannung und ermittelt aus diesen Größen Filterstrom und Filterspannung.An intermediate circuit converter 2 equipped with a measuring and control unit 1 feeds a high-voltage transformer 3, the output voltage of which is applied to an electrostatic filter 5 via a rectifier 4. The measuring and control unit 1 is connected to a higher-level automation unit 6. The higher-level automation unit 6 can, for. B. a programmable logic controller (Siemens S5) or a personal computer. The measuring and control unit 1 measures or determines continuously - z. B. every millisecond - DC link current and primary voltage on the primary side and determines the filter current and filter voltage from these variables.

Wenn die Filterspannung von einer Messung bzw. Berechnung auf die andere von einem Wert oberhalb eines vorgegebenen, veränderbaren Minimalwertes, z. B. 5 kV, auf weniger als einen vorgegebenen, veränderbaren Prozentsatz, z. B. 25 %, absinkt, so wird auf Filterdurchschlag erkannt. Wenn die Filterspannung in einer vorgegebenen, veränderbaren Durchschlag-Wartezeit zwischen 0 und 200 ms, z. B. 100 ms, wieder über diesen Prozentsatz ansteigt, wird in der Meß- und Steuereinheit 1 der Zähler für selbstverlöschende Durchschläge um eins erhöht. Andernfalls wird der Zähler für nicht selbstverlöschende Durchschläge um eins erhöht und eine Entionisierungsreaktion eingeleitet. Anschließend wird das Filter 5 wieder aufgeladen.If the filter voltage from one measurement or calculation to the other from a value above a predetermined, changeable minimum value, z. B. 5 kV, less than a predetermined, variable percentage, for. B. 25%, it is detected on filter breakdown. If the filter voltage is within a predefined, changeable breakdown waiting time between 0 and 200 ms, e.g. B. 100 ms, increases again above this percentage, the counter for self-extinguishing breakthroughs is increased by one in the measuring and control unit 1. Otherwise, the counter for non-self-extinguishing breakthroughs is increased by one and a deionization reaction is initiated. The filter 5 is then recharged.

Wenn die Primärspannung des Hochspannungstransformators 3 unter einen vorgegebenen, veränderbaren Minimalwert im Bereich von 60 bis 100 V, typisch ca. 80 V, absinkt, während einer vorgegebenen, veränderbaren Kurzschluß-Wartezeit von z. B. 250 ms nicht wieder über diesen Wert ansteigt und gleichzeitig ein Filterstrom fließt, der größer als ein vorgegebener, veränderbarer Mindeststrom, z. B. 10 % des Maximalstromes, ist, so wird auf Filterkurzschluß erkannt und die Stromzufuhr in den Zwischenkreis des Zwischenkreisumrichters 2 für eine vorgegebene, veränderbare Wartezeit von z. B. 500 ms gesperrt. Ferner wird der Zeitpunkt des Filterkurzschlusses gespeichert. Anschließend wird das Filter 5 wieder aufgeladen. Übersteigt die Zahl der Filterkurzschlüsse während einer vorgegebenen, veränderbaren Zeitspanne, z. B. eine Minute, eine vorgegebene, veränderbare maximale Anzahl, z. B. 10, so wird auf Dauerkurzschluß erkannt und das Elektrofilter 5 abgeschaltet.If the primary voltage of the high-voltage transformer 3 drops below a predetermined, changeable minimum value in the range from 60 to 100 V, typically about 80 V, during a predetermined, changeable short-circuit waiting time of, for. B. 250 ms does not rise above this value again and at the same time a filter current flows which is greater than a predetermined, variable minimum current, for. B. 10% of the maximum current, is detected on filter short circuit and the power supply in the intermediate circuit of the intermediate circuit converter 2 for a predetermined, variable waiting time of z. B. locked for 500 ms. The time of the filter short circuit is also saved. The filter 5 is then recharged. Exceeds the number of filter short circuits during a predetermined, changeable period of time, e.g. B. a minute, a predetermined, changeable maximum number, e.g. B. 10, it is recognized for permanent short-circuit and the electrostatic filter 5 is switched off.

In Intervallen werden von der übergeordneten Automatisiereinheit 6 Kommandos sowie eventuell nötige Parameter an die Meß- und Steuereinheit 1 übertragen. Diese Kommandos können sein:

  • Das Kommando zum Verändern der Betriebsart (Gleichstrombetrieb, Pulsbetrieb, gemischter Betrieb),
  • das Kommando zum Verändern der Betriebsparameter und die neuen Betriebsparameter,
  • das Kommando zur Aufnahme einer Filterkennlinie.
At intervals, 6 commands and any necessary parameters are transmitted from the higher-level automation unit to the measuring and control unit 1. These commands can be:
  • The command to change the operating mode (DC operation, pulse operation, mixed operation),
  • the command to change the operating parameters and the new operating parameters,
  • the command to record a filter characteristic.

Wenn die Meß- und Steuereinheit 1 das Kommando zur Kennlinienaufnahme empfängt, unterbricht die Meß- und Steuereinheit 1 den normalen Betrieb des Elektrofilters 5, nimmt die Filterkennlinie auf und überträgt die Daten an die übergeordnete Automatisiereinheit 6. Die Automatisiereinheit 6 zeigt die Filterkennlinie auf einem (nicht dargestellten) Monitor an, wertet die übermittelten Daten aus und übertragt neue Sollwerte an die Meß- und Steuereinheit 1. Neue Sollwerte können für alle veränderbaren Werte vorgegeben werden. Als Beispiele seien hier genannt:

  • Stellgrößen wie z. B. Zwischenkreisstrom und bei Pulsbetrieb die Pulsdauer,
  • Vergleichsgrößen wie z. B. die kritische Spannung für die Detektion eines Filterkurzschlusses,
  • Zeiten wie z. B. die Durchschlag-Wartezeit.
When the measuring and control unit 1 receives the command to record the characteristic curve, the measuring and control unit 1 interrupts the normal operation of the electrostatic filter 5 and takes the filter characteristic curve and transmits the data to the higher-level automation unit 6. The automation unit 6 displays the filter characteristic on a monitor (not shown), evaluates the transmitted data and transmits new setpoints to the measuring and control unit 1. New setpoints can be used for all changeable values be specified. Examples include:
  • Manipulated variables such. B. DC link current and in pulse mode the pulse duration,
  • Comparative variables such as B. the critical voltage for the detection of a filter short circuit,
  • Times such as B. the breakthrough waiting time.

Wenn das Elektrofilter 5 mit Gleichstrom betrieben wird, wird die Filterkennlinie als Funktion der Filterspannung in Abhängigkeit vom Filterstrom dargestellt. Wenn das Elektrofilter mit Strompulsen betrieben wird, wird als Filterkennlinie die Filterspannung als Funktion der Zeit dargestellt. Um während der Pause zwischen zwei Pulsen die Filterwerte primärseitig messen zu können, werden während der Pulspause periodisch, z. B. mit einer Frequenz zwischen 100 und 1000 Hz, kleine Meßpulse an das Elektrofilter 5 angelegt. Dies ist im Pulsbetrieb nicht nur während der Kennlinienaufnahme, sondern immer nötig, da sonst während der Pulspausen das Elektrofilter 5 durch den Gleichrichter 4 vom Hochspannungstransformator 3 abgekoppelt ist.If the electrostatic filter 5 is operated with direct current, the filter characteristic curve is represented as a function of the filter voltage as a function of the filter current. If the electrostatic filter is operated with current pulses, the filter voltage as a function of time is shown as the filter characteristic. In order to be able to measure the filter values on the primary side during the pause between two pulses, periodically, e.g. B. with a frequency between 100 and 1000 Hz, small measuring pulses applied to the electrostatic filter 5. This is always necessary in pulse mode not only during the recording of the characteristic curve, since otherwise the electrostatic filter 5 is decoupled from the high-voltage transformer 3 by the rectifier 4 during the pulse pauses.

Im Vorangegangenen wurde neben einem Regelverfahren für die Stromversorgungseinrichtung eines Elektrofilters 5 durch eine Meß- und Steuereinheit 1 die Führung der Meß- und Steuereinheit 1 einer Stromversorgungseinrichtung für ein Elektrofilter 5 durch eine übergeordnete Automatisiereinheit 6 geschildert. Selbstverständlich ist es ebenso möglich, mit einer derartigen Automatisiereinheit 6 mehrere Elektrofilter 5 zu führen. Die Betriebsarten der Elektrofilter sind hierbei völlig unabhängig voneinander.In the foregoing, in addition to a control method for the power supply device of an electrostatic filter 5 by a measuring and control unit 1, the guidance of the measuring and control unit 1 of a power supply device for an electrostatic filter 5 by a higher-level automation unit 6 was described. Of course, it is also possible to guide several electrostatic filters 5 with such an automation unit 6. The operating modes of the electrostatic precipitators are completely independent of one another.

Claims (11)

  1. Control process for the power supply device of an electrostatic filter, the device consisting of an indirect converter equipped with a measuring and control unit and with downstream high-voltage transformer, whereby the measuring and control unit (1) measures current and voltage of the high-voltage transformer (3) on the primary side and, from this, secondary filter current and secondary filter voltage are automatically calculated and upon detection of a filter short circuit from the calculated values for a specified variable waiting time of the external current supply no more current is removed, the instant of the occurrence of the filter short circuit is stored and the indirect converter (2) is disconnected if the number of filter short circuits within a specified variable period exceeds a specified variable limit.
  2. Process according to claim 1, characterized in that the electrostatic filter (5) is operated with direct current.
  3. Process according to claim 1, characterized in that the electrostatic filter (5) is operated with current pulses.
  4. Process according to claim 1, 2 or 3, characterized in that the electrostatic filter (5) is operated with direct current on which current pulses are imposed.
  5. Process according to one or more of claims 1 to 4, characterized in that with an electrostatic filter (5) operated with current pulses, during the pause between two current pulses at short intervals measuring pulses are applied to the electrostatic filter (5).
  6. Process according to one or more of claims 1 to 5, characterized in that a filter puncture is detected in that the filter voltage decreases in a short time, for example 1-10 ms, from a high value, for example greater than 5 kV, to a low value, for example less than 25% of the previous voltage.
  7. Process according to claim 6, characterized in that upon detection of a filter puncture a counter in the measuring and control unit (1) is increased, after a specified variable puncture waiting time it is examined anew as to whether a filter puncture is taking place, and with the presence of a filter puncture a deionizing reaction is introduced.
  8. Process according to one or more of claims 1 to 7, characterized in that a filter short circuit is detected in that with small primary voltage, for example 60 to 100 V, of the high-voltage transformer (3) a high filter current flows, for example more than 10% of the maximum current.
  9. Process according to one or more of the above claims, characterized in that at intervals a filter characteristic is taken up, from which new desired values are calculated for the control of the indirect converter (2).
  10. Process according to claim 9, characterized in that manipulated variables, for example the intermediate-circuit current, comparison variables, for example the minimum value for detection of a filter short circuit, and times, for example the puncture waiting time, can be specified as new desired values.
  11. Process according to claim 9 or 10, characterized in that the characteristics are transmitted by the measuring and control unit (1) to an automation unit (6) of a higher level, are evaluated by the automation unit and the new desired values are transmitted to the measuring and control unit (1).
EP90905427A 1990-04-04 1990-04-04 Process for controlling the current supply device of an electrofilter Expired - Lifetime EP0534950B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1990/000262 WO1991015297A1 (en) 1990-04-04 1990-04-04 Process for controlling the current supply device of an electrofilter

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EP0534950A1 EP0534950A1 (en) 1993-04-07
EP0534950B1 true EP0534950B1 (en) 1995-07-26

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US (1) US5471377A (en)
EP (1) EP0534950B1 (en)
JP (1) JPH05505137A (en)
AT (1) ATE125470T1 (en)
DE (2) DE59009450D1 (en)
DK (1) DK0534950T3 (en)
ES (1) ES2075201T3 (en)
WO (1) WO1991015297A1 (en)

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Publication number Priority date Publication date Assignee Title
EP0569838A1 (en) * 1992-05-15 1993-11-18 Siemens Aktiengesellschaft Control process and control device for an electrofilter
FR2723438B1 (en) * 1994-08-02 1996-09-20 Lorraine Carbone IMPROVED POWER CHEMICAL HEAT PUMP REACTOR
DE19501901B4 (en) * 1995-01-23 2006-08-17 Siemens Ag Method for controlling the filter flow of an electrostatic precipitator
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DE4108811A1 (en) 1991-10-10
US5471377A (en) 1995-11-28
EP0534950A1 (en) 1993-04-07
DE59009450D1 (en) 1995-08-31
JPH05505137A (en) 1993-08-05
DK0534950T3 (en) 1995-12-18
ATE125470T1 (en) 1995-08-15
ES2075201T3 (en) 1995-10-01
WO1991015297A1 (en) 1991-10-17

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