DE2130805A1 - Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk - Google Patents

Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk

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Publication number
DE2130805A1
DE2130805A1 DE19712130805 DE2130805A DE2130805A1 DE 2130805 A1 DE2130805 A1 DE 2130805A1 DE 19712130805 DE19712130805 DE 19712130805 DE 2130805 A DE2130805 A DE 2130805A DE 2130805 A1 DE2130805 A1 DE 2130805A1
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DE
Germany
Prior art keywords
voltage
held
positive
negative
way
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.)
Pending
Application number
DE19712130805
Other languages
German (de)
Inventor
Hermann Dipl-Ing Krug
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19712130805 priority Critical patent/DE2130805A1/en
Publication of DE2130805A1 publication Critical patent/DE2130805A1/en
Pending 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

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  • Electrostatic Separation (AREA)

Abstract

A method of controlling the flashover voltage of D.C. electrostatic precipitators uses a rectifier and transformer connected in series, this leads to superimposition of a positive or negative D.C. voltage with an alternating voltage of any frequency. Specif. the applied voltage variation may be determined in accordance with the specific resistance of the dust separated; the method operates by periodically reducing the surface charge of dust of high resistance, thus reducing the flashover risk.

Description

Steuerung der Rücksprüheinsatzspannung eines Gleichspannungsfilters durch Anwendung von Mischspannungen.Control of the back spray voltage of a DC voltage filter by using mixed voltages.

Bei der Abscheidung hochohmiger Stäube mit Hilfe eines Gleichspannungsstaubfilters tritt in der abgeschiedenen Staubschicht das sogenannte Rücksprühen ein, welches die Abscheideleistung eines derartigen Filters ganz erheblich zu verringern vermag. Als Rücksprühen bezeichnet man elektrische Gasentladungen, die in der hochohmigen Staubschicht zünden. Der Einsatz dieser Entladungen erfolgt nicht sofort beim Anlegen der Spannung, sondern je nach Ladungszustand an der Oberfläche der Staubschicht, zeitlich gestaffelt. Wenn man Sorge trägt, dass in bestimmten Zeitabständen die Aufladung der Stauboberfläche zumindest reduziert wird, so kann man das Rücksprühen weitgehend unterbinden.When separating high-resistance dust with the help of a DC voltage dust filter the so-called back-spraying occurs in the separated dust layer, which able to reduce the separation efficiency of such a filter quite considerably. Back spraying is the term used to describe electrical gas discharges that occur in the high-resistance Ignite the dust layer. The use of these discharges does not take place immediately upon application the voltage, but depending on the state of charge on the surface of the dust layer, staggered in time. If you take care that the Charging of the dust surface is at least reduced, so you can spray back largely prevent.

Der erfindungsgemässe Vorschlag dazu ist folgender: Durch Speisung des Filters mit Mischspannungen lässt sich die an der Oberfläche der Staubschicht vorhandene Ladung auf einfache Weise reduzieren. Als Spannungsquelle dient hierbei z.B. die Reihenschaltung eines Gleichrichters und eines Trafos. Der Gleichrichter wird von einem eigenen Transformator gespeist. Man kann die Höhe der Gleich- bzw. Wechselspannung jetzt so einstellen, dass die Gesamtspannung in der positiven Spannungshalbschwingung grösse.O wird. Auf diese Weise werden vom Sprühsystem positive Ladungsträger erzeugt, wleche die negative Ladungs dichte auf - bzw. in der Staubschicht reduzieren.The proposal according to the invention is as follows: By feeding the filter with mixed voltages can be the on the surface of the dust layer reduce existing charge in a simple way. The voltage source is used here E.g. the series connection of a rectifier and a transformer. The rectifier is fed by its own transformer. You can determine the height of the equal resp. Now set the alternating voltage so that the total voltage is in the positive voltage half-oscillation size. O becomes. In this way, positive charge carriers are generated by the spray system, wheche the negative charge density - or reduce it in the dust layer.

Es ist zu beachten, dass möglichst niederfrequente Spannungen zur Anwendung gelangen, um die Ladeleistung des Filters klein zu halten. Derselbe Effekt lässt sich erreichen, wenn der negativen bzw. positiven Betriebsspannung des Filters positive bzw. negative Spannungsimpulse überlagert werden.It should be noted that voltages that are as low as possible are used for Use to keep the charging power of the filter small. Same effect can be achieved when the negative or positive operating voltage of the filter positive or negative voltage pulses are superimposed.

Patent - Ansprüche s. AnlagePatent claims see attachment

Claims (7)

Patent - Ansprüche Steuerung der Rücksprüheinsatzspannung eines Gleichspannungsfilters durch Anwendung von Mischspannungen.Patent - Claims Control of the back spray voltage of a DC voltage filter by using mixed voltages. 1) Konstruktion der Steuerung der RückspriiheinsatzXpannung für Gleichspannungsfilter so gehalten, dass durch weihenschaltung eines Gleichrichters und eines Trafos, überlagerung einer positiven oder negativen Gleichspannung mit Wechselspannung beliebiger Frequenz erreicht wird.1) Construction of the control of the sprayback insert voltage for DC voltage filters held in such a way that by connecting a rectifier and a transformer in series, superimposition a positive or negative direct voltage with alternating voltage of any frequency is achieved. Konstruktion nach Anspruch 1 so gehalten, dass eine Überla-2) gerung einer positiven oder negativen Gleichspannung mit positiven oder negativen Spannungsimpulsen möglich ist.Construction according to claim 1 held in such a way that an overlap 2) a positive or negative DC voltage with positive or negative voltage pulses is possible. 3) Konstruktion nach Anspruch 1 so gehalten, dass eine Überlagerung einer positiven oder negativen Gleichspannung mit einer anderen Spannung beliebiger Kurvenform f Trapez, Dreieck usw.) möglich- ist.3) Construction according to claim 1 held so that an overlay a positive or negative DC voltage with any other voltage of your choice Curve shape f trapezoid, triangle, etc.) is possible. 4) Konstruktion nach Anspruch 1, 2 u. 3 so gehalten, dass die Art der Überlagerungsspannung nach den jeweiligen Betriebsverhältnissen bestimmt werden kann. (Unter Betriebsverhältnisse soll hier insbesondere die Höhe des spezifischen Staubwiderstandes -erstanden werden.) 4) Construction according to claim 1, 2 and 3 held in such a way that Art the superimposition voltage can be determined according to the respective operating conditions can. (Under operating conditions, the amount of the specific Dust resistance.) 5) Konstruktion nach Anspruch 1, 2, 3 u. 4 so gehalten, dass es möglich ist, immer im niederfrequen-ten Bereich zu arbeiten.5) Construction according to claim 1, 2, 3 and 4 held in such a way that it is possible to always work in the low-frequency range. 6) Konstruktion nach Anspruch 1 so gehalten und geschaffen,dass für den Fall, dass Wechselspannung sinusförmigen Verlaufs oder eine Spannung: beliebiger Kurvenform als Überlagerungsspannung zur Anwendung kommt,der Frequenzbereich: sichergestellt werden kann. 6) Construction according to claim 1 held and created so that in the event that AC voltage sinusoidal or a voltage: any curve shape is used as an overlay voltage, the frequency range: can be ensured. 7) Konstruktion für die Steuerung der Pückspriiheinsatzspannung nach Anspruch 1 bis 6 so gehalten, dass sowohl die Gleichals auch die Überlagerungsspannung in ihrer Amplitude regel-oder steuerbar sind.7) Construction for the control of the spray application voltage according to Claim 1 to 6 held so that both the DC and the superimposition voltage are regulated or controllable in their amplitude.
DE19712130805 1971-06-22 1971-06-22 Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk Pending DE2130805A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712130805 DE2130805A1 (en) 1971-06-22 1971-06-22 Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712130805 DE2130805A1 (en) 1971-06-22 1971-06-22 Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk

Publications (1)

Publication Number Publication Date
DE2130805A1 true DE2130805A1 (en) 1972-12-28

Family

ID=5811404

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712130805 Pending DE2130805A1 (en) 1971-06-22 1971-06-22 Electrostatic dust precipitator - with periodically varying voltage to reduce flashover risk

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Country Link
DE (1) DE2130805A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2341541A1 (en) * 1972-08-17 1974-03-07 High Voltage Engineering Corp METHOD AND EQUIPMENT FOR ELECTROSTATIC PARTICULAR DEPOSITION
DE2438881A1 (en) * 1973-12-06 1975-06-12 High Voltage Engineering Corp METHOD AND EQUIPMENT FOR ELECTROSTATIC PARTICULAR DEPOSITION
US4209306A (en) * 1978-11-13 1980-06-24 Research-Cottrell Pulsed electrostatic precipitator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2341541A1 (en) * 1972-08-17 1974-03-07 High Voltage Engineering Corp METHOD AND EQUIPMENT FOR ELECTROSTATIC PARTICULAR DEPOSITION
DE2438881A1 (en) * 1973-12-06 1975-06-12 High Voltage Engineering Corp METHOD AND EQUIPMENT FOR ELECTROSTATIC PARTICULAR DEPOSITION
US4209306A (en) * 1978-11-13 1980-06-24 Research-Cottrell Pulsed electrostatic precipitator

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