EP0030657B1 - Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge et appareil pour la mise en oeuvre du procédé - Google Patents

Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge et appareil pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0030657B1
EP0030657B1 EP80107357A EP80107357A EP0030657B1 EP 0030657 B1 EP0030657 B1 EP 0030657B1 EP 80107357 A EP80107357 A EP 80107357A EP 80107357 A EP80107357 A EP 80107357A EP 0030657 B1 EP0030657 B1 EP 0030657B1
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EP
European Patent Office
Prior art keywords
voltage
breakdown
filter
waiting time
during
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
Application number
EP80107357A
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German (de)
English (en)
Other versions
EP0030657A1 (fr
Inventor
Helmut Dipl.-Ing. Herklotz
Franz Dipl.-Ing. Neulinger
Horst Dr. Dipl.-Ing. Daar
Heinrich Winkler
Günter Mehler
Helmut Dipl.-Ing. Schummer
Walter Dipl.-Ing. Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Siemens AG
Original Assignee
Metallgesellschaft AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metallgesellschaft AG, Siemens AG filed Critical Metallgesellschaft AG
Priority to AT80107357T priority Critical patent/ATE4486T1/de
Publication of EP0030657A1 publication Critical patent/EP0030657A1/fr
Application granted granted Critical
Publication of EP0030657B1 publication Critical patent/EP0030657B1/fr
Expired legal-status Critical Current

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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 method for automatically guiding the voltage of an electrostatic precipitator at the breakdown limit by increasing the filter voltage as a function of time until it breaks down and then reducing it as a function of breakdown.
  • This generic term refers to a method as described, for example, in DE-B-11 48 977.
  • the degree of separation of an electrostatic precipitator is higher the closer the operating voltage is to the flashover limit. Since the rollover limit changes during operation depending on several influencing factors, such as. B. gas composition, dust content and temperature changes, the voltage of the electrostatic precipitator must be controlled depending on the amount of the rollover limit.
  • Devices for voltage regulation are known in which the voltage is increased up to the rollover limit. If one or more rollovers occur, the voltage is reduced by a certain fixed amount below the rollover limit and then increased again to the rollover limit.
  • a control capacitor is charged depending on the filter current via a resistor.
  • a continuously controllable tube is connected in parallel to this control capacitor, which in turn is controlled by a capacitor.
  • This capacitor is charged depending on the breakdown and continuously discharged via a parallel resistor.
  • the voltage at the control capacitor serves as a control voltage for a primary-side actuator.
  • the current dependency of the charging voltage for the control capacitor is such that a relatively rapid increase in voltage is achieved with small separator currents and a relatively slow increase with large separator currents. Due to the constant discharge of the control capacitor - depending on the flashover - the separator voltage after flashover is reduced by an amount given by the number or duration of the flashover.
  • the object of the present invention is to optimize the control method in stationary operation, in which the breakdown limit is continuously scanned as a function of time, so that one drives at the breakdown limit as far as possible, but the number of breakdowns required to drive at this limit - during its duration yes the actual separation is not possible - is kept within predetermined limits.
  • This object is achieved in that after each breakdown the voltage or the current is reduced by a percentage of the breakdown voltage or the breakdown current which is dependent on the breakdown frequency in a predetermined period of time and that the waiting time until a new one Voltage increase is reduced when the measured voltage amplitude during breakdown has increased to the measured voltage amplitude during the previous breakdown and vice versa.
  • the voltage is reduced by a percentage, which is determined on the one hand by the breakdown voltage and on the other hand by the history of the breakdown; the waiting time is also determined so that no impermissible breakdown frequency occurs.
  • the filter voltage is advantageously increased to a breakdown with a fixed, preselectable voltage gradient that depends on the operating state of the system.
  • the voltage increase provided at the end of the waiting time advantageously does not take place, but the new waiting time running from this point in time is shortened.
  • the waiting time can advantageously also be changed in stages of different sizes, e.g. B. the steps can be selected in the form of a geometric series.
  • a microcomputer is advantageously provided for specifying the control voltage to the actuator, which is made up of the measured and stored Filter values, the required reduction and the waiting time as well as other parameters are calculated.
  • an electrostatic filter 5 is fed from an alternating current network 1 via a rectifier 4 and a high-voltage transformer 3.
  • an alternating current regulator 2 consisting of anti-parallel thyristors is provided, the lattice control unit 21 of which receives its control voltage U st from a digital regulator 6, which is shown with a broken line.
  • This dashed-edged digital controller 6 today generally consists - as indicated by the equal sign 8 - of the microcomputer system shown in FIG Measured values and data from the periphery can be entered and output.
  • the digital controller is shown in the form of hard-wired function blocks.
  • the control voltage U st is supplied by a control module 61 which determines the filter voltage U or the filter current I.
  • the gradient of the increase in the filter voltage up to the breakdown is predetermined by the module 63.
  • the setting value for this gradient is taken from a memory 62 depending on the operating conditions of the filter. If the filter voltage reaches the breakdown value, which is determined from the primary current I P and / or the breakdown of the secondary-side voltage U F , the breakdown detection element 70 issues a corresponding voltage reduction command to the voltage control unit 61 via a percentage amount adjuster 66 and a voltage reduction element 65.
  • the reduction amount in the event of a breakdown is calculated or where X is a value between 0.2 and 1, n is the reduction stage and U F is the current filter voltage. The same applies if there is not a filter voltage reduction, but a filter current reduction ⁇ I F of the filter current I F.
  • the value n is determined from the history of the filter, namely the number k of carbon copies during a previous search period of z. B. 10 to 30 minutes depending. If the number k of the breakdowns not caused by the scanning of the filter voltage limit is greater than a preselectable limit kg of z. B. 1,000, the reduction level n. increased and a new search period started. Then the reduction amounts ⁇ u are calculated and saved.
  • the reduction level n initially remains unchanged. If k is also less than kg in the following search period, the reduction level n is reduced. Then the new current reduction amounts ⁇ u are also calculated and saved.
  • the waiting time T until the filter voltage starts up again is changed as a function of the breakdown, specifically the value of the breakdown voltage U FV stored in a memory 69 is compared with the current breakdown voltage U Fa during the previous breakdown. If it is found that the measured voltage amplitude during the breakdown has increased to the measured voltage amplitude during the previous breakdown, the waiting time is reduced by the amount ⁇ T in the time change element 67 by the comparison element 68.
  • This amount of time change .DELTA.T then changes the waiting time T of the waiting stage 64 accordingly.
  • FIG. 2 shows the voltage profiles on the filter.
  • the cut control and the rectifiers on the secondary side cause pulsating half-waves. If a provoked breakdown occurs at point D1, the filter voltage U F initially breaks down, the recurring filter voltage is then reduced by an amount ⁇ u, which is calculated according to the equation given above. This is followed by a waiting time T closes up to the point S on, is increased from which the filter voltage U F again to provoked breakdown D2, after which the voltage U F is also lowered again to a value .DELTA.u.
  • the voltage comparison values which are decisive for the waiting time are obtained the peak values of the voltage half-waves determined immediately before the breakdowns.
  • the peak values are continuously recorded and stored and those values (e.g. U Fa , U FV ) that are immediately before the breakthrough are used for the comparison.
  • the filter voltage is optimally guided at the breakdown limit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Networks Using Active Elements (AREA)
  • Power Conversion In General (AREA)

Claims (7)

1. Procédé pour amener automatiquement la tension d'un électrofiltre (5) au niveau de la limite de décharge par accroissement, en fonction du temps, de la tension (UF) du filtre jusqu'à la charge, et par diminution ultérieure, en fonc- con de la décharge, caractérisé en ce qu'après chaque décharge, la tension ou le courant (UF, IF) est réduite d'un pourcentage (Δu, Δl) de la valeur de la tension de décharge ou du courant, qui dépend de la fréquence (k) des décharges dans un intervalle de temps antérieur déterminé, et que le temps d'attente (T) jusqu'à un nouvel accroissement de la tension est réduit lorsque l'amplitude de tension mesurée (UFa) lors de la décharge a augmenté par rapport à l'amplitude de tension mesurée (UFv) lors de la décharge précédente, et inversement.
2. Procédé selon la revendication 1, caractérisé en ce que la tension (UF) du filtre peut être augmentée jusqu'à la décharge, avec un gradient de tension fixe et pouvant être présélectionné.
3. Procédé selon la revendication 1, caractérisé en ce que lors de l'apparition d'au moins une décharge pendant le temps d'attente (T), l'accroissement de la tension, prévu à la fin du temps d'attente, est supprimé, alors que le nouveau temps d'attente (T) qui s'écoule à partir de cet instant est raccourci.
4. Procédé selon la revendication 1, caractérisé en ce que le temps d'attente (T) est modifié par échelons possédant des valeurs différentes.
5. Procédé selon la revendication 4, caractérisé en ce que les échelons sont choisis sous la forme d'une progression géométrique.
6. Procédé selon la revendication 1, caractérisé en ce que les valeurs crêtes (UF) des alternances de tension sont comparées entre elles immédiatement avant les décharges.
7. Dispositif pour la mise en oeuvre du procédé selon les revendications 1 à 6, dans un électrofiltre (5), qui est alimenté par l'intermédiaire d'un redresseur (4), d'un transformateur et d'un organe de réglage (2), à partir d'un réseau (1) à tension alternative, caractérisé en ce que pour la prédétermination de la tension de commande (Ust) appliquée à l'organe de réglage (2), il est prévu un microcalculateur (8) qui, à partir des valeurs du filtre et des données mesurées et mémorisées, calcule la diminution nécessaire (Δu, Δl) de la tension du filtre ou du courant dans le filtre lors de la décharge et le temps d'attente (T) jusqu'à un nouvel accroissement de la tension (UF) du filtre.
EP80107357A 1979-12-11 1980-11-25 Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge et appareil pour la mise en oeuvre du procédé Expired EP0030657B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107357T ATE4486T1 (de) 1979-12-11 1980-11-25 Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze und vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792949764 DE2949764A1 (de) 1979-12-11 1979-12-11 Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze
DE2949764 1979-12-11

Publications (2)

Publication Number Publication Date
EP0030657A1 EP0030657A1 (fr) 1981-06-24
EP0030657B1 true EP0030657B1 (fr) 1983-08-24

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EP80107357A Expired EP0030657B1 (fr) 1979-12-11 1980-11-25 Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge et appareil pour la mise en oeuvre du procédé

Country Status (7)

Country Link
US (1) US4354152A (fr)
EP (1) EP0030657B1 (fr)
JP (1) JPS56124460A (fr)
AT (1) ATE4486T1 (fr)
AU (1) AU538541B2 (fr)
DE (2) DE2949764A1 (fr)
ZA (1) ZA807728B (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015275A1 (de) * 1980-04-21 1981-10-22 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze
DE3017685A1 (de) * 1980-05-08 1981-11-12 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum regeln der spannung eines in einer anlage eingesetzten elektrofilters
SE8104574L (sv) * 1981-07-28 1983-01-29 Svenska Flaektfabriken Ab Styranordning for en elektrostatisk stoftavskiljare
US4479164A (en) * 1982-08-09 1984-10-23 Combustion Engineering, Inc. Control for an electrostatic treater
US4587475A (en) * 1983-07-25 1986-05-06 Foster Wheeler Energy Corporation Modulated power supply for an electrostatic precipitator
US4536698A (en) * 1983-08-25 1985-08-20 Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Po Ochikh Tke Tekhnologichesky Gazov, Stochnykh Vod I Ispolzovaniju Vtorichnykh Energoresursov Predpriyaty Chernoi Metallurgii Vnipichermetenergoochist Ka Method and apparatus for supplying voltage to high-ohmic dust electrostatic precipitator
GB2149594A (en) * 1983-11-09 1985-06-12 Smidth & Co As F L Fast-acting spark-over detector
US4605424A (en) * 1984-06-28 1986-08-12 Johnston David F Method and apparatus for controlling power to an electronic precipitator
DK552186A (da) * 1986-11-19 1988-05-20 Smidth & Co As F L Fremgangsmaade og apparat til detektering af tilbagestraaling i et elektrofilter med almindelig eller intermitterende jaevnspaendingsforsyning
DE4220658C1 (fr) * 1992-06-24 1993-03-18 Metallgesellschaft Ag, 6000 Frankfurt, De
SE500810E (sv) * 1993-01-29 2003-04-29 Flaekt Ab Sätt att vid ¦verslag reglera str¦mtillf¦rseln till en elektrostatisk stoftavskiljare
US5378978A (en) * 1993-04-02 1995-01-03 Belco Technologies Corp. System for controlling an electrostatic precipitator using digital signal processing
US5689177A (en) * 1996-01-11 1997-11-18 The Babcock & Wilcox Company Method and apparatus to regulate a voltage controller
RU2266161C1 (ru) * 2004-08-09 2005-12-20 Сикорский Владимир Иванович Способ автоматического регулирования напряжения электрофильтра
CN114100860B (zh) * 2022-01-29 2022-04-19 华能平凉发电有限责任公司 一种电除尘器的闪络电压控制方法及装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148977B (de) * 1958-07-02 1963-05-22 Licentia Gmbh Einrichtung zur Spannungsregelung von elektrostatischen Abscheidern
DE1657352A1 (de) * 1967-06-12 1972-01-05 Transform Roentgen Matern Veb Einrichtung zur Regelung der Ausgangsspannung von Gleichspannungserzeugern fuer elektrische Abscheider

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1557061B2 (de) * 1966-01-18 1976-05-13 Fuji Electric Co., Ltd., Kawasaki, Kanagawa (Japan) Einrichtung zum regeln der spannung eines elektroabscheiders
US3577708A (en) * 1968-05-28 1971-05-04 Koppers Co Inc Spark interval responsive precipitator voltage control
US3745749A (en) * 1971-07-12 1973-07-17 Envirotech Corp Circuits for controlling the power supplied to an electrical precipitator
DE2540084C2 (de) * 1975-09-09 1983-08-25 Metallgesellschaft Ag, 6000 Frankfurt Einrichtung zum hochspannungsseitigen Erfassen von Überschlägen bei einem Elektroabscheider

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148977B (de) * 1958-07-02 1963-05-22 Licentia Gmbh Einrichtung zur Spannungsregelung von elektrostatischen Abscheidern
DE1657352A1 (de) * 1967-06-12 1972-01-05 Transform Roentgen Matern Veb Einrichtung zur Regelung der Ausgangsspannung von Gleichspannungserzeugern fuer elektrische Abscheider

Also Published As

Publication number Publication date
US4354152A (en) 1982-10-12
DE2949764A1 (de) 1981-07-02
DE3064654D1 (en) 1983-09-29
ATE4486T1 (de) 1983-09-15
AU538541B2 (en) 1984-08-16
JPS6124052B2 (fr) 1986-06-09
ZA807728B (en) 1981-12-30
EP0030657A1 (fr) 1981-06-24
JPS56124460A (en) 1981-09-30
AU6522480A (en) 1981-06-18

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