EP0508509B1 - Verfahren zur Bestimmung der optimalen Anzahl von Durchschlägen pro Zeiteinheit Dsn in einem elektrostatischen Abscheider - Google Patents

Verfahren zur Bestimmung der optimalen Anzahl von Durchschlägen pro Zeiteinheit Dsn in einem elektrostatischen Abscheider Download PDF

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Publication number
EP0508509B1
EP0508509B1 EP92200725A EP92200725A EP0508509B1 EP 0508509 B1 EP0508509 B1 EP 0508509B1 EP 92200725 A EP92200725 A EP 92200725A EP 92200725 A EP92200725 A EP 92200725A EP 0508509 B1 EP0508509 B1 EP 0508509B1
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EP
European Patent Office
Prior art keywords
determined
voltage
time
values
per unit
Prior art date
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Expired - Lifetime
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EP92200725A
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German (de)
English (en)
French (fr)
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EP0508509A1 (de
Inventor
Ralph Hundertmark
Heinrich Böcker
Helmut Schummer
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GEA Group AG
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Metallgesellschaft AG
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Publication date
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Publication of EP0508509A1 publication Critical patent/EP0508509A1/de
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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

Definitions

  • the invention relates to a method for determining the optimal number of breakdowns per unit time Ds n in an electrostatic precipitator.
  • GB-A-981147 describes a method for automatic voltage control in an electrostatic precipitator, in which a continuous measurement of the voltage profile is carried out during operation and the voltage difference between the respective breakdown voltage and the voltage which is actually set is continuously calculated. The voltage difference determined in this way is compared with a predetermined voltage difference. If the specified voltage difference is greater than the determined one, the voltage applied in the electrostatic precipitator is increased. If the specified voltage difference is smaller than the determined one, the voltage applied in the electrostatic precipitator is reduced. In this method, the voltage difference determined is varied by varying the voltage applied until it coincides with the predetermined voltage difference.
  • GB-A-956783 describes a method for regulating the voltage of an electrostatic precipitator, in which the intensity of each breakdown is measured during a certain period of time. The individual measured values are summed up and compared with a specified value. The voltage in the electrostatic precipitator is increased if the sum is less than the specified value. If the total is greater than the specified value, the voltage in the electrostatic precipitator is reduced. In this process, the quantity is called 'intensity' understand the electrical charge flowing between the precipitation electrodes during the individual breakdowns in a certain time interval.
  • DE-B-1154076 describes a device for contactless, constant voltage regulation of electrostatic precipitators as a function of the number of flashovers, in which an arrangement for comparing an actual value formed by integrating the flashovers in a memory with a continuous or pulse-shaped - preferably on a memory - Provided setpoint is provided, which actuates the actuator for the separator voltage when a control deviation occurs.
  • the electrical quantities derived from the rollover setpoint and rollover actual values are applied to the control lines of at least one magnetic amplifier provided as a comparison arrangement in such a way that the output signal of the magnetic amplifier immediately delivers the control deviation signal for the contactless, continuous control of the separator voltage.
  • the invention has for its object to provide a method for determining the optimal number of breakthroughs per unit time Ds n in an electrostatic precipitator, which can be carried out relatively quickly and in which an adaptation to fluctuating parameters of the exhaust gas, such as temperature and concentration of the Pollutants is possible.
  • the object underlying the invention is achieved by a method for determining the optimal number of breakthroughs per unit time Ds n in an electrostatic precipitator, in which in a first step an arbitrarily selected number of breakthroughs per unit time Ds1 is specified and up to a point in time t1 individual values of the values that arise during operation Breakdown voltage U1 D can be determined as a function of time t and at which the values be determined, then the value is determined and in a second step an arbitrarily selected number of breakdowns per unit time Ds2 is specified and up to a point in time t2 the individual values of the voltage U2 arising during operation are determined, the individual values of the breakdown voltage U2 D as a function of Time t can be determined and at which the values be determined, then the value is determined, the values Vh1 and Vh2 are compared with each other and then n - 2 further steps are carried out, the values Vh3 to Vh n being determined in a corresponding manner and for each different choice of the number of breakthroughs per unit time D
  • the optimal number of breakdowns per unit time Ds n is to be understood as the number of breakdowns per unit time whose specification specifies the greatest efficiency of the electrostatic precipitator. With the proposed method, the optimal number of breakthroughs per unit time Ds n can be determined both in a wet electro separator and in a dry electro separator.
  • the voltage U1 which arises during operation is to be understood as those voltages which are determined in the first step of the method for determining the optimal number of breakdowns per unit time Ds n in the electrostatic precipitator.
  • the breakdown voltage U1 D is to be understood as those voltages in the first step at which a voltage drop occurs immediately after their setting. The voltage usually drops to a residual voltage.
  • the voltages U2 and U2 D are correspondingly related to the second step of the method for determining the optimal number of breakdowns per unit time Ds n .
  • the method according to the invention allows the optimum number of penetrations per unit time Ds n to be determined relatively quickly, with fluctuations in the exhaust gas with regard to the temperature and concentration of the pollutants being taken into account.
  • the breakdown voltages in the i-th step of the method for determining the optimal number of breakdowns per unit time Ds n are to be understood as Ui D.
  • Ui means the voltages that arise in the i-th step.
  • the efficiency of an electrostatic precipitator is a function of the effective rate of migration of the individual dust particles for a given separation area of the precipitation electrodes and for a given throughput of the exhaust gas.
  • This effective migration speed is in turn a function of the voltage Ui raised to 2.
  • Fig. 1 shows the breakdown voltage Ui D as a function of time t.
  • 3a, 3b, 3c, 3d schematically show the value Vh i as a function of the number of breakdowns per time unit Ds i .
  • Fig. 1 the breakdown voltage Ui D is shown as a function of time t with the hatched area (2) under the breakdown voltage curve (1).
  • n corresponds to the area of the hatched area (2) in the time interval t i-1 to t i to the value Fmax i.
  • the breakdown voltage curve (1) which describes the functional relationship between the breakdown voltage Ui D and the time t, is also shown in dashed lines.
  • the area of the hatched area (4) under the voltage curve (3) corresponds to the value Fact i .
  • the voltage Ui is first increased until it reaches the value of the breakdown voltage Ui D.
  • the values Vh3 and Vh2 are compared in a corresponding manner and the corresponding number of breakthroughs per time unit Ds4 for the fourth step is selected and specified accordingly.
  • the areas of the hatched areas (2) and (4) are the same, so that a value of 1 results for Vh i .
  • the optimum number of breakthroughs per unit time Ds n is reached when the value Vh i can no longer be increased by further steps and the value Vh n is thus reached.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP92200725A 1991-04-10 1992-03-13 Verfahren zur Bestimmung der optimalen Anzahl von Durchschlägen pro Zeiteinheit Dsn in einem elektrostatischen Abscheider Expired - Lifetime EP0508509B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4111673A DE4111673C1 (enExample) 1991-04-10 1991-04-10
DE4111673 1991-04-10

Publications (2)

Publication Number Publication Date
EP0508509A1 EP0508509A1 (de) 1992-10-14
EP0508509B1 true EP0508509B1 (de) 1994-08-24

Family

ID=6429272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200725A Expired - Lifetime EP0508509B1 (de) 1991-04-10 1992-03-13 Verfahren zur Bestimmung der optimalen Anzahl von Durchschlägen pro Zeiteinheit Dsn in einem elektrostatischen Abscheider

Country Status (3)

Country Link
EP (1) EP0508509B1 (enExample)
AT (1) ATE110299T1 (enExample)
DE (2) DE4111673C1 (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142501C1 (enExample) * 1991-12-21 1992-12-10 Metallgesellschaft Ag, 6000 Frankfurt, De
DE4220658C1 (enExample) * 1992-06-24 1993-03-18 Metallgesellschaft Ag, 6000 Frankfurt, De
DE19511442C1 (de) * 1995-03-30 1996-03-07 Babcock Anlagen Gmbh Verfahren zum Betrieb eines elektrostatischen Abscheiders

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080979B (de) * 1954-09-29 1960-05-05 Herbert Brandt Dr Ing Verfahren zur selbstaendigen Regelung der Spannung von elektrischen Gasreinigungsanlagen
US2978065A (en) * 1957-07-03 1961-04-04 Svenska Flaektfabriken Ab Regulating electric precipitators
DE1154076B (de) * 1958-10-16 1963-09-12 Licentia Gmbh Einrichtung zur kontaktlos stetigen Spannungsregelung von elektrostatischen Abscheidern
GB956783A (en) * 1960-08-05 1964-04-29 Brandt Herbert Voltage regulation in gas purifying plant
DE1199240B (de) * 1961-02-17 1965-08-26 Herbert Brandt Dr Ing Verfahren und Einrichtung zur selbsttaetigen Regelung der Spannung eines elektrostatischen Staubabscheiders
GB981147A (en) * 1962-07-28 1965-01-20 Brandt Herbert Improvements in the automatic voltage control of electrical precipitators
DE3219664A1 (de) * 1982-05-26 1983-12-01 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur erfassung von durchschlaegen bei einem elektrofilter
DE3301772A1 (de) * 1983-01-20 1984-07-26 Walther & Cie AG, 5000 Köln Verfahren und vorrichtung zur automatischen spannungsregelung eines elektrostatischen filters
GB8431294D0 (en) * 1984-12-12 1985-01-23 Smidth & Co As F L Controlling intermittant voltage supply

Also Published As

Publication number Publication date
ATE110299T1 (de) 1994-09-15
DE59200397D1 (de) 1994-09-29
EP0508509A1 (de) 1992-10-14
DE4111673C1 (enExample) 1992-07-02

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