EP0386242A1 - Pulsspannungsgenerator für gasreinigungselektrofilter - Google Patents

Pulsspannungsgenerator für gasreinigungselektrofilter Download PDF

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Publication number
EP0386242A1
EP0386242A1 EP88909404A EP88909404A EP0386242A1 EP 0386242 A1 EP0386242 A1 EP 0386242A1 EP 88909404 A EP88909404 A EP 88909404A EP 88909404 A EP88909404 A EP 88909404A EP 0386242 A1 EP0386242 A1 EP 0386242A1
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EP
European Patent Office
Prior art keywords
voltage
electrostatic precipitator
corona
electrode
outputs
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.)
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Application number
EP88909404A
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English (en)
French (fr)
Other versions
EP0386242A4 (en
Inventor
Valery Pavlovich Zhmurov
Boris Iliich Grinshtein
Zinovy Lazarevich Shvarts
Viktor Vladimirovich Nagorny
Stanislav Leontievich Bezugly
Vladimir Petrovich Kotlyar
Vladimir Ivanovich Sikorsky
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.)
Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni Gmkrzhizhanovskogo
Original Assignee
Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni Gmkrzhizhanovskogo
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.)
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Publication of EP0386242A1 publication Critical patent/EP0386242A1/de
Publication of EP0386242A4 publication Critical patent/EP0386242A4/en
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to the area of electric gas cleaning, and more specifically.to pulse voltage supplies for electrostatic precipitators.
  • a thyristor controller connected to a sine voltage supply, a step-up transformer, the primary whereof is connected to the thyristor controller, with a voltage sensor connected to the corona-forming and precipitating electrodes.
  • the output of the voltage sensor is connected to the input of a control unit, the outputs whereof are connected to the thyristor gates in the thyristor controller.
  • the secondary of the step-up transformer drives a bridge rectifier, the output whereof is loaded onto a capacitor, the first lead whereof is connected to the precipitator's corona-forming electrode via connected in series electronic key and first choke, with the electronic key shunted by connected in series gate of opposite polarity and second choke.
  • the second lead of the capacitor is connected to the precipitating electrode.
  • the outputs of a pulse generator are connected to the heavy-duty terminal and to the control input of the electronic key.
  • the repetition rate of pulses from the generator connected to the heavy-duty terminal and to the control input of the electronic key is preset for each gas cleaning process individually, depending on the properties of the dust being precepitated.
  • the pulse supply further comprises a resistor with the first lead thereof connected to the output of the bridge rectifier and with the second lead thereof connected to a lead of the first choke connected to the electronic key.
  • the voltage across the precipitator electrodes is approximately equal to the voltage of corona discharge initiation.
  • the capacitor connected across the bridge rectifier output is charged to a voltage, the magnitude whereof is set by the thyristor controller, which receives a signal, as specified by the precipitator process, from the output of the control unit.
  • Enabling the electronic key initiates an oscillatory process in the capacitor precipitator-choke network, wherein the time dependence of the voltage across the precipitator electrodes is determined by the precipitator and choke electric parameters, so that this voltage exceeds the voltage across the capacitor.
  • a.bell-shaped pulse is developed across the precipitator.
  • the electronic key is disabled the voltage across the electrodes drops off to the corona voltage.
  • This bell-shaped waveform of the supply voltage eliminates corona backfiring, liable to be generated when precipitating dust of a specific electric conductivity over 10 10 0hm ⁇ m (high-resistance dust).
  • a pulse supply voltage reduces the mean voltage drop across the precipitator electrodes.
  • the efficiency of precipitation is determined by the mean voltage across the precipitator, and therefore a lower mean voltage reduces the efficiency of dust precipitation and the efficiency of dust gathering by the precipitating electrodes.
  • the main mechanism reducing the efficiency of charging and precipitating the dust particles is corona backfire at the precipitating electrode.
  • a pulsed supply waveform allows elimination of corona backfire and thus makes it possible to intensify the process of dust particles charging and precipitation on the precipitation electrode.
  • This invention is to provide a pulse voltage supply for electrostatic precipitators, the design configuration whereof, by increasing the mean voltage, would improve the efficiency of gas cleaning in electrostatic precipitators.
  • the pulse voltage supply for electrostatic precipitators comprising a step-up transformer with the primary thereof connected to a sine voltage supply via a hhyristor controller, a control unit with the outputs thereof connected to the thyristor gates in the thyristor controller, a precipitator parameters sensor with the inputs thereof connected to the corona-forming and precipitating electrodes of the electrostatic precipitator and with the output thereof connected to the input of the control unit, a bridge rectifier with the inputs thereof connected to the secondary of the step-up transformer and with the first and second outputs thereof electrically connected to the corona-forming and precipitating electrodes., a capacitor with the first lead thereof connected via connected in series choke and electronic key shunted by an opposite connected gate to the corona-forming electrode of the electrostatic precipitator and with the second lead thereof connected to the precipitating electrode of the electrostatic precipitator, a pulse generator with the outputs thereof connected to a heavy-duty contact terminal and to the control input of the electronic key, according to the invention the output
  • the use of this invention allows improvement of gas cleaning efficiency from dust with a specific resistivity below 1 0 9 obm.m (medium-resistance dust) by increasing the mean voltage across the electrostatic precipitator electrodes, while applying a pulse voltage to these electrodes.
  • the pulse voltage supply for electrostatic precipitators comprises thyristor controller 1 (Fig. 1) designed with two thyristors 2,3 in parallel-opposition connection.
  • Thyristor controller 1 is connected to the first terminal of primary 4 of step-up transformer 5.
  • Primary 4 of step-up transformer 4 has its first terminal connected to a sine voltage supply (not shown in the Figure) via thyristor controller 1 and its second terminal directly connected to this sine voltage supply.
  • Secondary 6 of step-up transformer 5 is connected to the inputs of bridge rectifier 7 comprising diodes 8,9,10,11.
  • the first output (negative terminal) of bridge rectifier 7 is connected directly to corona-forming electrode 1 4 of electrostatic precipitator 13, with precipitating electrode 14 thereof connected to common bus 15.
  • the second output (positive terminal) of bridge rectifier 7 is connected to common bus 15.
  • the pulse voltage supply further comprises control unit 16 of generally known design (T.M. A.Aliev. "Agregati pitaniya elektrofiltrov” (Electrostatic Precipitator Power Supplies), Moscow, Energoizdat Publishers, 1981, pp. 53-60. In Russian).
  • the output of control unit 16 is connected to gates 17 of thyristors 2,3 in thyristor controller 1.
  • the pulse voltage supply yet further comprises capacitor 1 8 with the first lead thereof connected via a network of connected in series first choke 19 and electronic key 20 to corona-forming electrode 12 of electrostatic precipitator 13, with electronic key 20 shunted by connected in opposition to it gate 21 and second choke 22.
  • the second lead of capacitor 18 is connected to common bus 15.
  • pulse generator 25 The outputs of pulse generator 25 are connected to the terminal of heavy-duty contact 23 and to control input 24 of electronic key 19 .
  • the repetition rate of pulse generator 25 is preset individually for each dust precipitation process, according to the properties of the dust being precipitated. The pulse repetition rate remains approximately constant during the entire process.
  • the pulse voltage supply comprises voltage sensor 26 serving as a sensor of the electric parameters of the electrostatic precipitator and designed as a voltage divider with resistors 27, 28 connected in parallel to electrostatic precipitator 13.
  • the first lead of voltage sensor 26 is connected to corona-forming electrode 1 2 of electrostatic precipitator 13, the second lead is connected to common bus 15, with sensor 26 output connected to the input of control unit 16.
  • the pulse voltage supply for electrostatic precipitators functions as follows.
  • Voltage U1 (Fig. 2a) from a sine voltage supply (not shown) is applied to primary 4 (Fig, 1) of step-up transformer 5 via thyristor controller 1.
  • the voltage from the terminals of secondary 6 of step-up transformer 5 is applied to the input of bridge rectifier 7, the output voltage whereof features an amplitude and frequency determined by the properties (specific resistivity) of the dust being precipitated by electrodes 12 and 14 of electrostatic precipitator 13.
  • the output signal of voltage sensor 26 carries data on processes taking place in electrostatic precipitator 13, such as corona discharge in the precipitator, dust particle charging and drift to the precipitating electrode, precipitation of dust particles on this latter, to the input of control unit 1 6.
  • Voltage pulses U i1 (Fig. 2c) from the output of control unit 16 are applied to the gates in thyristor controller 1, with the algorithm of the pulse sequence dependent on the processes taking place in electrostatic precipitator 13 (Fig. 1) and determining the firing angle of thyristors 2,3 in thyristor controller 1.
  • firing thyristors 2,3 of thyristor. controller 1 at the moment of time to, voltage U 1 (Fig. 2a) transformed by step-up transformer 5 (Fig. 1) and rectified by bridge rectifier 7 charges the equivalent capacitance between the corona-formirg electrode 12 and precipitating electrode 14 of electrostatic precipitator 13.
  • voltage U 2 (Fig.
  • Voltage U 2 (Fig. 2b) is maintained at a level, corresponding to breakdown of the interelectrode gap in electrostatic precipitator 13 by the signal arriving from the output of control unit 16 (Fig. 1).
  • Capacitor 18 is charged via gate 21 to a voltage of U 1 magnitude (Fig. 2a) simultaneously with charging the interelectrode capacitance of electrostatic precipitator 13.
  • the use of the pulse voltage supply for electrostatic precipitators improves the efficiency of gas cleaning, reduces wear of electrostatic precipitators and prolongs their service life, and reduces power consumption.
  • This invention can be advantageously applied in thhermal power engineering, in ferrous and non-ferrous metallurgy, in the chemical industry, and in the construction material industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
EP19880909404 1988-08-19 1988-08-19 Pulsed-voltage source for gas-cleaning electrofilters Withdrawn EP0386242A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1988/000157 WO1990001991A1 (en) 1988-08-19 1988-08-19 Pulsed-voltage source for gas-cleaning electrofilters

Publications (2)

Publication Number Publication Date
EP0386242A1 true EP0386242A1 (de) 1990-09-12
EP0386242A4 EP0386242A4 (en) 1991-01-09

Family

ID=21617288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880909404 Withdrawn EP0386242A4 (en) 1988-08-19 1988-08-19 Pulsed-voltage source for gas-cleaning electrofilters

Country Status (4)

Country Link
EP (1) EP0386242A4 (de)
JP (1) JPH03501941A (de)
FI (1) FI901971A0 (de)
WO (1) WO1990001991A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7547353B2 (en) * 2004-10-26 2009-06-16 F.L. Smidth Airtech A/S Pulse generating system for electrostatic precipitator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5588440A (en) * 1995-08-10 1996-12-31 Cowie; Jocelyn W. Method and apparatus for locating and assessing soft tissue lesions

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108963A1 (de) * 1982-11-06 1984-05-23 Walther & Cie. Aktiengesellschaft Versorgungsschaltung für einen elektrostatischen Staubabscheider

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
SU1268207A1 (ru) * 1984-11-06 1986-11-07 Московское Отделение Ордена "Знак Почета" Научно-Исследовательского Института По Передаче Электроэнергии Постоянным Током Высокого Напряжения Устройство дл питани электрофильтра (его варианты)
GB8431294D0 (en) * 1984-12-12 1985-01-23 Smidth & Co As F L Controlling intermittant voltage supply
SU1282100A1 (ru) * 1985-04-02 1987-01-07 Научно-Исследовательский И Проектный Институт По Газоочистным Сооружениям,Технике Безопасности И Охране Труда В Промышленности Строительных Материалов Источник питани электрофильтра

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108963A1 (de) * 1982-11-06 1984-05-23 Walther & Cie. Aktiengesellschaft Versorgungsschaltung für einen elektrostatischen Staubabscheider

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9001991A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7547353B2 (en) * 2004-10-26 2009-06-16 F.L. Smidth Airtech A/S Pulse generating system for electrostatic precipitator

Also Published As

Publication number Publication date
EP0386242A4 (en) 1991-01-09
WO1990001991A1 (en) 1990-03-08
JPH03501941A (ja) 1991-05-09
FI901971A0 (fi) 1990-04-19

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