EP0030657A1 - 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
EP0030657A1
EP0030657A1 EP80107357A EP80107357A EP0030657A1 EP 0030657 A1 EP0030657 A1 EP 0030657A1 EP 80107357 A EP80107357 A EP 80107357A EP 80107357 A EP80107357 A EP 80107357A EP 0030657 A1 EP0030657 A1 EP 0030657A1
Authority
EP
European Patent Office
Prior art keywords
voltage
breakdown
filter
waiting time
current
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.)
Granted
Application number
EP80107357A
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German (de)
English (en)
Other versions
EP0030657B1 (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
Siemens Corp
Original Assignee
Metallgesellschaft AG
Siemens AG
Siemens Corp
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, Siemens Corp 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-AS 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 flashover limit changes during operation depending on several influencing variables, such as gas composition, dust content and temperature changes, the voltage of the electrostatic precipitator must be regulated depending on the amount of the flashover 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 in stationary operation, in which the breakdown limit is continuously scanned depending on the time, to optimize the control process so that one drives at the breakdown limit as far as possible, but the number of breakdowns required to drive at this limit - during which duration 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.
  • 1 advantageously does not increase the voltage increase provided when the waiting time has elapsed but the new waiting time that runs from this point is shortened.
  • the waiting time can advantageously also be changed in stages of different sizes, e.g. 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 consists of the measured and saved filter values, the required reduction and the waiting time as well as other parameters are calculated.
  • an electrostatic filter 5 is fed from an AC 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 and / or the breakdown of the secondary-side voltage UF, there is the breakdown detection element 70 sends 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 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 not a filter voltage reduction, but a filter current reduction ⁇ I. of the filter current I F is made.
  • the value n is determined from the history of the filter and is dependent on the number k of carbon copies during a previous search period of, for example, 10 to 30 minutes. If the number k of breakdowns not caused by the scanning of the filter voltage limit is greater than a preselectable limit value k of, for example, 1000, the reduction level n is increased and a new search period is started. Then the reduction amounts ⁇ u are calculated and saved.
  • the reduction level n initially remains unchanged. If k is also less than k 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 I until the filter voltage starts up again is changed as a function of the breakdown, specifically the value of the breakdown voltage U F stored in a memory 69 during the previous breakdown is compared with the current breakdown voltage U Fa . If it turns out that the measured voltage amplitude during breakdown has increased to the measured voltage amplitude during the previous breakdown, then by the comparison element 68 reduces the waiting time by the amount ⁇ T in the time change element 67.
  • This amount of time change p T then changes the waiting time T of the waiting stage 64 accordingly.
  • the changing of the waiting times is graded in a geometric series, for example. If, for example, the comparisons show that the current breakdown voltage is always greater than the previous breakdown voltage, the waiting times are reduced by amounts ⁇ T, which increase, for example, in a geometric series. The reverse applies in the event that the values become lower and lower. If at least one breakdown occurs during the waiting time, the voltage increase provided at the end of the waiting time is omitted, but the waiting time running from this point in time is also reduced by the amount T after the current change level.
  • 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 relevant for the waiting time are determined directly from the peak values of the voltage half-waves directly before the breakdowns.
  • the peak values are continuously recorded and stored and those values (eg U Fa , U F V) used for the comparison that are immediately before the breakthrough.
  • 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)
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
DE2949764 1979-12-11
DE19792949764 DE2949764A1 (de) 1979-12-11 1979-12-11 Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze

Publications (2)

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

Family

ID=6088134

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038505A1 (fr) * 1980-04-21 1981-10-28 Metallgesellschaft Ag Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge
EP0039817A1 (fr) * 1980-05-08 1981-11-18 Metallgesellschaft Ag Méthode de réglage de la tension d'un électrofiltre placé dans une installation
EP0071592A3 (en) * 1981-07-28 1984-04-18 Flakt Aktiebolag Control device for an electrostatic dust separator
EP0145221A1 (fr) * 1983-11-09 1985-06-19 F.L. Smidth & Co. A/S Détecteur d'étincelle à action rapide
EP0576069A1 (fr) * 1992-06-24 1993-12-29 Metallgesellschaft Ag Procédé pour amener la tension UF d'un séparateur électrostatique à la limite de claquage

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1557061A1 (de) * 1966-01-18 1970-04-02 Fuji Electric Co Ltd Elektrofilteranlage

Family Cites Families (5)

* 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
DE1657352B2 (de) * 1967-06-12 1974-02-14 Veb Transformatoren- Und Roentgenwerk Hermann Matern, X 8030 Dresden Einrichtung zur Regelung der Ausgangsspannung von Gleichspannungserzeugern für elektrische Abscheider
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1557061A1 (de) * 1966-01-18 1970-04-02 Fuji Electric Co Ltd Elektrofilteranlage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038505A1 (fr) * 1980-04-21 1981-10-28 Metallgesellschaft Ag Procédé pour porter automatiquement la tension d'un électrofiltre à la limite de décharge
EP0039817A1 (fr) * 1980-05-08 1981-11-18 Metallgesellschaft Ag Méthode de réglage de la tension d'un électrofiltre placé dans une installation
EP0071592A3 (en) * 1981-07-28 1984-04-18 Flakt Aktiebolag Control device for an electrostatic dust separator
EP0145221A1 (fr) * 1983-11-09 1985-06-19 F.L. Smidth & Co. A/S Détecteur d'étincelle à action rapide
EP0576069A1 (fr) * 1992-06-24 1993-12-29 Metallgesellschaft Ag Procédé pour amener la tension UF d'un séparateur électrostatique à la limite de claquage

Also Published As

Publication number Publication date
DE3064654D1 (en) 1983-09-29
JPS6124052B2 (fr) 1986-06-09
ZA807728B (en) 1981-12-30
AU6522480A (en) 1981-06-18
US4354152A (en) 1982-10-12
DE2949764A1 (de) 1981-07-02
JPS56124460A (en) 1981-09-30
ATE4486T1 (de) 1983-09-15
EP0030657B1 (fr) 1983-08-24
AU538541B2 (en) 1984-08-16

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