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EP0369016A1 - Source de tension alternative pour electrofiltres de purification de gaz - Google Patents

Source de tension alternative pour electrofiltres de purification de gaz Download PDF

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Publication number
EP0369016A1
EP0369016A1 EP88907451A EP88907451A EP0369016A1 EP 0369016 A1 EP0369016 A1 EP 0369016A1 EP 88907451 A EP88907451 A EP 88907451A EP 88907451 A EP88907451 A EP 88907451A EP 0369016 A1 EP0369016 A1 EP 0369016A1
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EP
European Patent Office
Prior art keywords
voltage
input
output
inputs
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.)
Withdrawn
Application number
EP88907451A
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German (de)
English (en)
Other versions
EP0369016A4 (en
Inventor
Boris Iliich Grinshtein
Valery Pavlovich Zhmurov
Anatoly Lukich Timoshenko
Stanislav Leontievich Bezugly
Vladimir Petrovich Kotlyar
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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Application filed by Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni Gmkrzhizhanovskogo filed Critical Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni Gmkrzhizhanovskogo
Publication of EP0369016A1 publication Critical patent/EP0369016A1/fr
Publication of EP0369016A4 publication Critical patent/EP0369016A4/ru
Withdrawn legal-status Critical Current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 present invention relates to the separation of very finely divided particles from gases using an electrostatic effect and in particular relates to a source of alternating voltage for gas cleaning electrostatic precipitators.
  • a source of alternating voltage for gas cleaning electrostatic precipitators (SU, A, 904784) which contains high-voltage sources for voltages of different polarities, which consist of step-up transformers, the primary windings of which are connected to a voltage source and the secondary windings of which are connected to the input of rectifier bridges.
  • the outputs of the rectifier bridges are connected to the electrodes of an electrostatic filter via changeover switches.
  • the source also contains a controlled discharge element, the first connection of which is connected to a spray electrode of the electrostatic precipitator, the second connection is connected via a limiting resistor to a low-level electrode of the electrostatic precipitator and the control input of which is connected to the first output of a control unit.
  • the two other outputs of the control unit are connected to the control inputs of the changeover switches.
  • the high voltage sources for voltages of positive and negative polarity are alternately connected to the electrostatic filter.
  • This device is complicated and not reliable enough to work due to the presence of the two high voltage sources and therefore also the two changeover switches. If one of the high-voltage sources fails, a voltage of one polarity is applied to the electrodes of the electrostatic filter with pauses, the duration of which is equal to the time of absence of the voltage of the other polarity. This causes a sharp drop in the degree of gas purification.
  • the input of a current generator is connected to the second connection of the secondary winding of the step-up transformer, the output of which is connected to a precipitation electrode of the electrostatic filter.
  • An input of a control unit is connected to the output of the current transmitter, the outputs of which are connected to the control inputs of the thyristor controller and to the second input of the former of an alternating voltage.
  • the source also includes a voltage divider in the form of a voltage divider, the first connection of which to the spray electrode of the electro Filters placed and the second connection is connected to the precipitation electrode of the electrostatic filter. The output of the voltage divider is led to the second input of the control unit.
  • the control unit contains a series circuit consisting of a current regulator, a logic unit and a former with wide chip removal pulses.
  • Said device ensures the one-way rectification of the voltage supplied to the electrodes of the electrostatic filter.
  • the positive and negative polarity of the voltage at the electrodes of the electrostatic precipitator are determined by the control input of the high-voltage thyristor holder located in the diagonal branch of the rectifier bridge of the former of an alternating voltage with voltage pulses from the output of the former of the control unit.
  • the output signals of the current and voltage transmitter go to the input of the current controller of the control unit.
  • the control unit specifies the polarity and amplitude of the voltage at the electrodes of the electrostatic filter and the duration of the voltage of each polarity. In emergency operation, for example in the event of a breakdown, the current regulator generates the control unit receives a signal to switch off the power supply.
  • the present invention is based on the object of providing a source of alternating voltage for gas cleaning electrostatic precipitators, the implementation of which in terms of circuitry by means of a transition to the operating mode of a unipolar power supply for the electrostatic precipitator makes it possible to increase the operational reliability of the device.
  • the Alternating voltage source for gas cleaning electrostatic precipitators which is provided with a means for electrode shaking and an step-up transformer, in which the connections of the primary winding are connected to an AC voltage source via a thyristor voltage regulator, an alternating voltage former, the first input of which is connected to the first connection of the secondary winding of the step-up transformer and its output is led to a spray electrode of the electric filter, a current transmitter, the input of which is connected to the second connection of the secondary winding of the step-up transformer and the output of which is electrically connected to a low-voltage electrode of the electrostatic filter, a control unit whose one input is connected to the output of the current generator and its outputs are connected to the control inputs of the thyristor voltage regulator and to the second input of the former of an alternating voltage, and contains a voltage generator in the form of a spa voltage divider is executed, the first connection to the spray electrode of the electrostatic precipitator, the second connection electrically connected to the precipitation electrode of the electrostatic
  • the source additionally contains an indicator connected to the output of the execution element.
  • the use of the present invention makes it possible to increase the operational reliability because in the source of alternating voltage for gas cleaning electrostatic precipitators, a check is carried out for the presence of a voltage of positive and negative polarity on the electrodes of the electrostatic precipitator.
  • the mode of operation is switched to a unipolar power supply for the electrostatic precipitator without a voltage drop during the absence of voltage from one of the polarities.
  • the source of alternating voltage for a gas cleaning electrostatic filter 1 (FIG. 1) is provided with a means 2 for shaking the electrodes.
  • the means 2 for shaking a precipitation electrode and a spray electrode 3 or 4 is designed in the form of a hammer system (not shown in FIG. 1) arranged on the shaft of an electric motor.
  • the source also has a thyristor voltage regulator 5, the first input of which is connected to an AC voltage source 6.
  • the thyristor voltage regulator 5 is constructed from two thyristor valves 7, 8 connected in anti-parallel.
  • the output of the thyristor voltage regulator 5 is connected to the primary winding 9 of a step-up transformer 10.
  • the first input of a former 12 of an alternating voltage is connected to the first connection of the secondary winding 11 of the step-up transformer 10, the output of which is connected to the spray electrode 4 of the electrostatic filter 1.
  • the former 12 of an alternating voltage is designed as a rectifier bridge with diodes 13, 14, 15, 16, in whose diagonal branch there is a 1% thyristor switch.
  • a combined connection of the diodes 13, 15 is connected to the first connection of the secondary winding 11 of the step-up transformer 10.
  • a combined connection of the diodes 14, 16 is guided to the spray electrode 4 of the electrostatic filter 1.
  • the source has a current transmitter 18, as which a shunt resistor is used, the high-voltage connections of which are connected to the second connection of the secondary winding 11 of the step-up transformer 10 and to a common rail 19.
  • the precipitation electrode 3 of the electrostatic filter 1 is guided to the common rail 19.
  • the first input of a control unit 20 is connected to the measuring terminals of the current transmitter 18, the outputs of which are connected to the control inputs of the thyristors 7, e of the thyristor controller 5 and to the control input of the thyristor switch 17, which occurs as the second input of the former 12 of an alternating voltage.
  • the control unit 20 contains a series circuit comprising a current regulator 21 (GM-A.Aliev "Agregaty pitania elektrofiltrov” (power supply devices for electrostatic precipitators), 1981, publisher “Energoizdat”, Moscow, pp. 96 to 97), a logic unit 22 and a former 23 broad voltage impulses ("Elektrotekhnika", No. 1.1985, BI Grinshtein ea "Tiristornyi istochnik znakoperemennogo napryazhenia. dlya pitania elektrofiltrov gazoochistki", Moscow, p. 22,23).
  • the first input of the current regulator 21 serves as the first input of the control unit 20 and is connected to the measuring terminals of the current generator 18.
  • the second input of the current regulator 21 occurs as the second input of the control unit 20.
  • the first and the second input of the logic unit 22 act as third and fourth inputs of the control unit 20.
  • the first and the second output of the shaper 23 of wide voltage pulses appear as the first and second inputs * of the control unit 20 and are at the control inputs of the thyristors 7,8 of the thyristor regulator 5 and the control inputs of the thyristor switch 17 of the former 12 are connected to an alternating voltage.
  • the source also includes a voltage transmitter 24, which is designed in the form of a voltage divider connected in parallel with the electrostatic filter 1, the first connection of which is connected to the spray electrode 4 of the electrostatic filter 1, the second connection to the common rail 19 and the output of which is connected to the second input of the control unit 20 .
  • the input of a unit 25 for separating the input signal into signals of different polarity is also connected to the combined connection of the voltage transmitter 24.
  • the unit 25 for separating the input signal into signals of different polarity contains anti-parallel diodes 26, 27, the inputs of which are connected together and the outputs of which are connected via stabilizer diodes 28, 29 to a common rail 30 of a (not shown in FIG.) Supply source of the control unit 20.
  • the inputs of integrators 31, 32, each of which contains an operational amplifier 33, in whose feedback circuits capacitors 34 are connected, are connected to the outputs of the unit 25 for separating the input signal into signals of different polarity.
  • the control input of the switching element 35 bridging the integrator 31 is connected to the input of the integrator 32.
  • the control input of the switching element 36 bridging the integrator 32 is connected to the input of the integrator 31.
  • the source also contains threshold elements 37, 38, the inputs of which are connected to the outputs of the integrators 31 and 32, and each of which is constructed in the form of an electronic relay.
  • the outputs of the sound wave elements 37, 38 are connected to the first and second inputs of the logic unit 22 of the control unit 20.
  • the outputs of the Sohwelle elements 37, 38 are also connected to the first and second inputs of an OR gate 39.
  • the output of the OR gate 39 is connected to the input of an execution element 40.
  • the execution element 40 is constructed in the form of an electronic switch from a transistor 41.
  • the base of transistor 41 is connected to the output of OR gate 39.
  • the emitter of transistor 41 is connected to the common rail 30.
  • the collector of the transistor 41 is in the circuit of an electromagnetic coil 42, the contacts 43 and 44 of which are in the supply circuit of the means 2 for shaking the electrodes 3 and 4 of the electrostatic filter 1 and in the circuit of an indicator 45.
  • the alternating voltage source for gas cleaning electrostatic precipitators works as follows.
  • the primary winding 9 (FIG. 1) of the step-up transformer 10 is supplied with a voltage U 1 (FIG. 2a) from the output of the Weohsel voltage source 6 (FIG. 1) via the thyristor voltage regulator 5. From the connection of the secondary winding 11 of the step-up transformer 10, the signal reaches the input of the shaper 12 of an alternating voltage, at the output of which a voltage U 2 (FIG. 2b, 3a) is generated, the amplitude and duration of each polarity due to the properties of the sicn on the electrodes 3, 4 (FIG. 1) of the electrostatic precipitator 1.
  • the information about the processes in the electrostatic filter 1 arrive at the input of the current controller 21 of the control unit 20, at the output of which voltage pulses U 3 (FIG. 2a) are generated.
  • voltage pulses U 4 At the exit of the former 23 (Fig. 1) wide voltage pulses of the control unit 20, voltage pulses U 4 (Fig. 2c) are formed, the sequence of which is predetermined by an algorithm from the logic unit 22 of the control unit 20.
  • the voltage pulses U 4 arrive at the control inputs of the thyristor voltage regulator 5 (FIG. 1) and the former 12 of an alternating voltage, as a result of which the value of the control angle ⁇ (FIG. 2a) of the thyristor valves 7,8 (FIG.
  • the thyristor switch 17 of the former 12 is determined.
  • the amplitude of the voltage of any polarity on the electrodes 3, 4 of the electrostatic filter 1 is regulated.
  • a voltage proportional to the voltage at the electrodes 3, 4 of the electrostatic filter 1 is supplied from the voltage generator 24 to the input of the unit 25 for separating the input signal into signals of different polarity.
  • the input signal of the unit 25 is limited to a certain level U 5 , U 6 (Fig. 3b, c) and branched into two channels via the valves 26,27 (Fig. 1).
  • the limit level of the voltage U 5 , U 6 corresponds to the minimum possible voltage at the electrodes 3, 4 (FIG. 1) of the electrostatic filter 1 in normal operation.
  • the voltage of positive and negative polarity U 5 , U 6 (FIG. 3b, c) is given by the outputs of the unit 25 (FIG.
  • the time constants of the integrators 31, 32 are selected such that the voltage at their outputs in normal operation with a maximum pulse duration of the voltage of any polarity at the electrodes 3, 4 of the electrostatic filter 1 does not exceed the threshold voltage U p (FIG. 3d). in which the threshold elements 37, 38 (FIG. 1) are triggered.
  • the voltage from the outputs of the integrators 31, 32 is fed to the inputs of the threshold elements 37, 38, the output signals of which are given via the OR gate 39 to the input of the execution element 40. If there is a voltage of both polarities at the electrodes 3, 4 of the electrostatic filter 1, the threshold elements 37, 38 do not respond, the signals fail to appear, which is why the execution element 40 is not triggered.
  • the control unit 20 does not generate a pulse U 4 (FIG. 2 c) for forming a voltage U 2 (FIG. 3 a ) of negative polarity through the former 12 (FIG. 1 ) of an alternating voltage (the missing pulses of voltage U 4 (FIG. 2c) coming from the output of the farmer 23 (FIG. 1) of wide pulses from the control unit 20) dotted hinted).
  • the former 23 (FIG. 1) of wide pulses from the control unit 20 generates a pulse of the voltage U 4 (FIG. 2c), which at the input of the former 12 (FIG. 1) has an alternating voltage to form a voltage of positive polarity arrives.
  • a signal U 9 (FIG. 3 f) reaches the input of control unit 20 (FIG. 1) from the output of threshold element 37 (FIG. 1) to make the channel more negative for the voltage Lock polarity.
  • a signal U 4 (FIG. 2c) had to be generated at the output of the control unit 20 (FIG. 1) at the time t 4 to form a voltage of negative polarity by the former 12. Since the channel for the negative polarity voltage in the control unit 20 is blocked by a signal arriving from the output of the threshold element 37 and carrying information about a failure of the negative polarity voltage at the electrodes 3, 4 of the electrostatic filter 1, a signal remains at the output of the former 23 (FIG.
  • the source operates in a similar manner.
  • the use of the alternating voltage source for gas cleaning electrostatic precipitators allows increasing the operational reliability of the electrostatic precipitator, the degree of gas purification in the absence of the voltage of one of the polarities on the electrodes of the electrostatic precipitator, and to prevent possible emergencies in the event of a voltage failure of one of the polarities caused by a simultaneous Falling large masses of separated dust can cause the hardening in the receiving bunkers of a system of pressurized water ash removal.
  • the present invention is used in energetics in thermal power plants, in black metallurgy, cement industry, building material production.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Electroluminescent Light Sources (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

Une source de tension alternative pour électrofiltres de purification de gaz pourvus de moyens (2) pour faire vibrer les électrodes comprend un transformateur survolteur (10) dont l'enroulement primaire (9) est relié, par l'intermédiaire d'un régulateur de tension du type thyristor (5), à une source de tension alternative (6), un générateur de tension alternative (12) dont l'entrée est reliée à l'enroulement secondaire (11) du transformateur survolteur (10), tandis que la sortie est reliée à l'électrode de courant (24) de l'électrofiltre (1). Un enroulement secondaire (11) du transformateur survolteur (10) est relié à un détecteur de courant (18) raccordé à l'électrode réceptrice (3) de l'électrofiltre (1). A la sortie du détecteur de courant (18) est raccordée l'entrée d'une unité de commande (20) dont les sorties sont reliées aux entrées du régulateur de tension du type thyristor (5) et du générateur de tension alternative (12). Aux électrodes de couronne et de réception (3, 4) de l'électrofiltre (1) est relié un détecteur de tension (24) se présentant sous la forme d'un diviseur de tension dont la sortie est reliée à l'unité de commande (20). La source comporte également une unité (25) pour diviser le signal d'entrée en signaux de polarité opposée, dont l'entrée est raccordée au détecteur de tension (24), des intégrateurs (31, 32) dont les entrées sont reliées aux sorties correspondantes de l'unité (25), des éléments de commutation (35, 36) dont les sorties respectives sont raccordées en parallèle à chacun des intégrateurs (31, 32), des éléments à seuil (37, 38) dont les entrées sont reliées aux sorties des intégrateurs (31, 32) et dont les sorties sont raccordées à l'unité de commande (20), un élément logique ''OU'' (39) dont les entrées sont reliées aux sorties des éléments à seuil (37, 38), ainsi qu'un élément d'actionnement (40) dont l'entrée est raccordée à la sortie de l'élément logique ''OU'' (39), tandis que la sortie est reliée aux moyens (2) pour faire vibrer les électrodes de l'électrofiltre (1).
EP19880907451 1988-04-22 1988-04-22 Source of alternating voltage for gas-cleaning electrofilters Withdrawn EP0369016A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1988/000094 WO1989010198A1 (fr) 1988-04-22 1988-04-22 Source de tension alternative pour electrofiltres de purification de gaz

Publications (2)

Publication Number Publication Date
EP0369016A1 true EP0369016A1 (fr) 1990-05-23
EP0369016A4 EP0369016A4 (en) 1990-09-26

Family

ID=21617242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880907451 Withdrawn EP0369016A4 (en) 1988-04-22 1988-04-22 Source of alternating voltage for gas-cleaning electrofilters

Country Status (4)

Country Link
EP (1) EP0369016A4 (fr)
JP (1) JPH03500503A (fr)
FI (1) FI896185A7 (fr)
WO (1) WO1989010198A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111448760A (zh) * 2017-12-19 2020-07-24 新电元工业株式会社 半导体模块

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7001447B1 (en) * 2003-04-22 2006-02-21 Electric Power Research Institute Polarity reversing circuit for electrostatic precipitator system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1372843A (en) * 1970-09-24 1974-11-06 Westinghouse Brake & Signal Electrical power supply control circuit
SU361462A1 (ru) * 1971-01-25 1972-12-07 Сибирский энергетический институт Сибирского отделени СССР 8СьСОЮ
US4111669A (en) * 1975-01-28 1978-09-05 Koppers Company, Inc. Magnetic impulse rapper control system
SU644032A1 (ru) * 1976-03-19 1979-01-25 Предприятие П/Я А-1772 Генератор пилообразного напр жени
US4308494A (en) * 1977-10-31 1981-12-29 General Electric Co. Thyristor power controller for an electrostatic precipitator
SU904784A1 (ru) * 1980-05-08 1982-02-15 Всесоюзный Научно-Исследовательский И Проектный Институт По Очистке Технологических Газов, Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии Устройство питани электрофильтра знакопеременным напр жением
US4488885A (en) * 1982-11-01 1984-12-18 High Voltage Engineering Corporation Electrostatic charging apparatus
SU1216824A1 (ru) * 1983-09-29 1986-03-07 Научно-Исследовательский И Проектный Институт Автоматизированных Систем Управления Автомобильным Транспортом Общего Пользования Формирователь напр жени развертки
DE3447719A1 (de) * 1983-12-28 1985-07-11 Senichi Tokio/Tokyo Masuda Impuls-hochspannungsquelle sowie hiermit ausgeruesteter elektrischer staubabscheider mit impulsaufladung
SU1306597A1 (ru) * 1984-04-20 1987-04-30 Московское Отделение Научно-Исследовательского Института По Передаче Электроэнергии Постоянного Тока Высокого Напряжения Устройство дл импульсного питани полей электрофильтра
SU1262705A1 (ru) * 1984-07-18 1986-10-07 Предприятие П/Я А-1298 Формирователь пилообразного напр жени
SU1262704A1 (ru) * 1984-09-10 1986-10-07 Предприятие П/Я Р-6621 Генератор линейно измен ющегос напр жени

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111448760A (zh) * 2017-12-19 2020-07-24 新电元工业株式会社 半导体模块
CN111448760B (zh) * 2017-12-19 2023-07-14 新电元工业株式会社 半导体模块

Also Published As

Publication number Publication date
FI896185A0 (fi) 1989-12-21
JPH03500503A (ja) 1991-02-07
EP0369016A4 (en) 1990-09-26
WO1989010198A1 (fr) 1989-11-02
FI896185A7 (fi) 1989-12-21

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