EP0038505B1 - Verfahren zum selbsttätigen Führen der Spannung eines Elektro-Filters an der Durchschlagsgrenze - Google Patents

Verfahren zum selbsttätigen Führen der Spannung eines Elektro-Filters an der Durchschlagsgrenze Download PDF

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Publication number
EP0038505B1
EP0038505B1 EP81102820A EP81102820A EP0038505B1 EP 0038505 B1 EP0038505 B1 EP 0038505B1 EP 81102820 A EP81102820 A EP 81102820A EP 81102820 A EP81102820 A EP 81102820A EP 0038505 B1 EP0038505 B1 EP 0038505B1
Authority
EP
European Patent Office
Prior art keywords
voltage
breakdown
time
filter
follow
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
EP81102820A
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German (de)
English (en)
French (fr)
Other versions
EP0038505A1 (de
Inventor
Helmut Dipl.-Ing. Herklotz
Günter Mehler
Franz Dipl.-Ing. Neulinger
Helmut Dipl.-Ing. Schummer
Horst Dr. Dipl.-Ing. Daar
Walter Dipl.-Ing. Schmidt
Heinrich Winkler
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 AT81102820T priority Critical patent/ATE6912T1/de
Publication of EP0038505A1 publication Critical patent/EP0038505A1/de
Application granted granted Critical
Publication of EP0038505B1 publication Critical patent/EP0038505B1/de
Expired legal-status Critical Current

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Classifications

    • 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 by a predetermined amount to a new value.
  • 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 as a function of time up to the rollover limit. If one or more rollovers occur, the voltage is reduced by a certain, predetermined amount below the rollover limit and then increased again to the rollover limit.
  • a control capacitor is charged via a resistor depending on the filter current.
  • 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 object of the present invention is therefore to design the method of the type mentioned in the introduction in such a way that consequential breakthroughs are avoided as far as possible.
  • the filter voltage is reduced to zero in the case of a further breakdown following a breakdown, the so-called follow-through breakdown, within a predetermined time period, and is brought up to the new value after a predetermined pause within a predetermined ramp-up period , whereby the breakthrough follow-up time is selected somewhat larger than the sum of the break and run-up time.
  • the control voltage for an actuator is then carried out so that its number remains as small as possible.
  • pause and run-up times are also advantageously made dependent on the number of subsequent copies in a previous, predetermined search period; d. H. If there were many follow-up copies in the previous search period, the pause duration and the ramp-up time are chosen to be relatively long and vice versa. This means that both the recording criterion for subsequent copies and their treatment follow the parameter subsequent copies themselves. Furthermore, the search period can also be made dependent on the number of copies.
  • the voltage or current is reduced after each breakdown.
  • a reduction in the current breakdown voltage or current is selected for the reduction, the percentage being dependent on the breakdown frequency in a previously defined period of time.
  • the power supply of an electrostatic filter normally consists of a thyristor actuator, which is arranged between the mains and a high-voltage transformer, and a rectifier connected downstream.
  • a microcomputer system is advantageously used within the scope of the present invention, which calculates the required control voltage from the existing values and stored operating parameters.
  • a breakthrough D may occur at time To. If the next breakdown lies within the so-called breakthrough time t F z. B. at T 1 , this breakdown is treated as a subsequent breakdown D F. If the breakthrough occurred outside the breakthrough follow-up time t F at time TY, it would happen again a normal breakthrough.
  • the breakthrough time t F is defined as
  • the pause time tp is to be understood as the pause or deionization time which should pass until the voltage is increased again after the control voltage has dropped to zero. This time is advantageously made automatically dependent on the frequency of the subsequent copies in a previous search period, i. H. if there were many subsequent runs, this pause time tp is increased and vice versa.
  • the run-up time t H is defined as the time that passes until the voltage is brought up to the new value. This time is also advantageously made dependent on the number of follow-through copies of a given search period, in the same way as the pause time, ie the increase is slowed down with increasing frequency, ie the run-up time is increased and vice versa. For safety henceforth nor the time T / 2 is then taken into account in the calculation of the penetration time sequence, wherein T under the power supply period of 20 ms and 16 2/3 ms is understood.
  • a breakdown D occurs at the time T o , as can be seen from the corresponding breakdown of the filter voltage U F or the increase in the filter current I F.
  • the control voltage Ust for the actuator is reduced by the amount L tU s t, so that a filter voltage would result in the subsequent half-wave which is lower than the previous voltage by the value UP.
  • This voltage drop UP can be selected as a percentage of the pulsating filter DC voltage that is currently present.
  • a new breakdown occurs at the time T 1 within the breakthrough follow-up time to be defined after the breakdown D, so that this breakdown is to be regarded as a subsequent breakdown D F.
  • the control voltage U st for the actuator is set to zero and the filter voltage is also reduced accordingly. Since this is the first subsequent breakdown, a pause time, ie a deionization time, is not taken into account and the filter voltage is gradually increased again within the period t H to the new value U FN of the filter voltage with the current value I FN . From this value, the breakdown limit is then sought again in a manner known per se by increasing the voltage as a function of time.
  • Fig. 3 shows the circuit implementation of the arrangement.
  • an AC voltage network 1 feeds the primary side of a high-voltage transformer 3 via a thyristor actuator 2.
  • a rectifier 4 is connected to the secondary side of the high-voltage transformer 3 and supplies the filter DC voltage for the electrostatic filter 5.
  • the control voltage U st for the control rate 21 of the thyristor actuator 2 is carried out by a digital controller 6, which - as indicated by the equal sign - today generally consists of a microcomputer system 7.
  • This system has the main components of the central unit 71, the memory 72 and the input and output devices 73. For the sake of easier understanding, however, the individual functions of this microcomputer system are shown as function blocks in the controller 6.
  • a breakdown detection 62 is provided which derives the criterion for the breakdown from the primary current and / or filter voltage, e.g. B. in such a way that it is checked whether the voltage in the current half-wave of the filter DC voltage falls below the corresponding values of the same phase position in the previous half-wave of the filter DC voltage. If a breakdown occurs, the voltage reduction element 63 generates a correspondingly reduced control voltage U st via the voltage regulator 61 and thus the filter voltage is lowered by the value OPEN. After a certain period of time has elapsed, this voltage is raised again to the breakdown limit using a predetermined gradient - gradient selector 64, whereupon the game described above is repeated.
  • the primary current and / or filter voltage e.g. B.
  • a follow-up breakdown detection 66 is connected to the breakdown detection 62 via a test stage 65; This reports breakthroughs that lie within the so-called breakthrough follow-up time t F as follow-through breakthroughs to the follow-through breakthrough detection element 66.
  • pause time tp and time t H of the increase as well as the breakthrough follow-up time are regarded as a function of the number of follow-through copies D F within a predetermined search period, a value proportional to the number h of follow-up copies within a given search period is also stored in a follow-through copy memory 67 and as appropriate size used to determine the breakthrough follow-up time and the other times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Rectifiers (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP81102820A 1980-04-21 1981-04-13 Verfahren zum selbsttätigen Führen der Spannung eines Elektro-Filters an der Durchschlagsgrenze Expired EP0038505B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81102820T ATE6912T1 (de) 1980-04-21 1981-04-13 Verfahren zum selbsttaetigen fuehren der spannung eines elektro-filters an der durchschlagsgrenze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803015275 DE3015275A1 (de) 1980-04-21 1980-04-21 Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze
DE3015275 1980-04-21

Publications (2)

Publication Number Publication Date
EP0038505A1 EP0038505A1 (de) 1981-10-28
EP0038505B1 true EP0038505B1 (de) 1984-04-04

Family

ID=6100559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102820A Expired EP0038505B1 (de) 1980-04-21 1981-04-13 Verfahren zum selbsttätigen Führen der Spannung eines Elektro-Filters an der Durchschlagsgrenze

Country Status (7)

Country Link
US (1) US4382805A (OSRAM)
EP (1) EP0038505B1 (OSRAM)
JP (1) JPS56163764A (OSRAM)
AT (1) ATE6912T1 (OSRAM)
AU (1) AU534502B2 (OSRAM)
DE (2) DE3015275A1 (OSRAM)
ZA (1) ZA812550B (OSRAM)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0097161B1 (en) * 1981-07-24 1987-03-18 TRUCE, Rodney John Detecting, measuring and applying back corona parameters on an electrostatic precipitator
DE3233249C2 (de) * 1982-09-08 1986-10-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum Steuern eines Elektroabscheiders und Steuerungsvorrichtung zur Durchführung des Verfahrens
JPS6125650A (ja) * 1984-07-17 1986-02-04 Sumitomo Heavy Ind Ltd 電気集塵装置の荷電制御方法
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 (OSRAM) * 1992-06-24 1993-03-18 Metallgesellschaft Ag, 6000 Frankfurt, De
DE4222069A1 (de) * 1992-07-04 1994-01-05 Rothemuehle Brandt Kritzler Verfahren zum Betrieb eines Elektrofilters sowie Elektrofilter zur Ausübung des Verfahrens
US7081152B2 (en) * 2004-02-18 2006-07-25 Electric Power Research Institute Incorporated ESP performance optimization control
CN103752413B (zh) * 2014-01-24 2016-03-23 镇江天力变压器有限公司 一种高频除尘电源的二次电压调理电路

Family Cites Families (9)

* 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
US3577708A (en) * 1968-05-28 1971-05-04 Koppers Co Inc Spark interval responsive precipitator voltage control
US3648437A (en) * 1969-07-23 1972-03-14 Koppers Co Inc Automatic scr precipitator control
US3745749A (en) * 1971-07-12 1973-07-17 Envirotech Corp Circuits for controlling the power supplied to an electrical precipitator
US3873282A (en) * 1972-07-27 1975-03-25 Gen Electric Automatic voltage control for an electronic precipitator
CA1089002A (en) * 1976-08-13 1980-11-04 Richard K. Davis Automatic control system for electric precipitators
US4290003A (en) * 1979-04-26 1981-09-15 Belco Pollution Control Corporation High voltage control of an electrostatic precipitator system
US4267502A (en) * 1979-05-23 1981-05-12 Envirotech Corporation Precipitator voltage control system
DE2949764A1 (de) * 1979-12-11 1981-07-02 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum selbsttaetigen fuehren der spannung eines elektrofilters an der durchschlagsgrenze

Also Published As

Publication number Publication date
ATE6912T1 (de) 1984-04-15
ZA812550B (en) 1982-04-28
DE3162931D1 (en) 1984-05-10
DE3015275A1 (de) 1981-10-22
US4382805A (en) 1983-05-10
JPS6124053B2 (OSRAM) 1986-06-09
JPS56163764A (en) 1981-12-16
AU534502B2 (en) 1984-02-02
AU6956581A (en) 1981-10-29
EP0038505A1 (de) 1981-10-28

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