DE19501901B4 - Method for controlling the filter flow of an electrostatic precipitator - Google Patents
Method for controlling the filter flow of an electrostatic precipitator Download PDFInfo
- Publication number
- DE19501901B4 DE19501901B4 DE1995101901 DE19501901A DE19501901B4 DE 19501901 B4 DE19501901 B4 DE 19501901B4 DE 1995101901 DE1995101901 DE 1995101901 DE 19501901 A DE19501901 A DE 19501901A DE 19501901 B4 DE19501901 B4 DE 19501901B4
- Authority
- DE
- Germany
- Prior art keywords
- filter
- current
- voltage
- breakdown
- electrostatic precipitator
- 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 - Lifetime
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Rectifiers (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Verfahren zur Regelung des Filterstromes (IF) eines Elektrofilters (7), bei dem nach Erkennung eines Filterdurchschlages (DS) über einen Spannungszusammenbruch der Filterstrom (IF) um einen vorgegebenen Prozentsatz (0,5 IF) abge- senkt wird, der Filterstrom (0,5 IF) sofort nach Wiederanstieg der Filterspannung (UF) auf einen vorgegebenen Wert (IF) angehoben wird und daß bei Nichtwiederkehr der Filterspannung (UF) nach einer vorgegebenen Wartezeit (t1–t4) der Filterstrom (IF) abgeschaltet wird.Method for controlling the filter current (I F ) of an electrostatic precipitator (7) in which, after a filter breakdown (DS) has been detected, the filter current (I F ) is lowered by a predetermined percentage (0.5 I F ) via a voltage breakdown; Filter current (0.5 I F ) immediately after the filter voltage (U F ) has risen to a predetermined value (I F ) is raised and that when not returning the filter voltage (U F ) after a predetermined waiting time (t 1 -t 4 ) of the filter current (I F ) is switched off.
Description
Die Erfindung bezieht sich auf ein Verfahren zur Regelung des Filterstromes eines Elektrofilters.The The invention relates to a method for controlling the filter flow an electrostatic precipitator.
Beim Auftreten eines Durchschlages, was sich durch den Zusammenbruch der Filterspannung bemerkbar macht, wird bei bekannten Steuerungen die Spannung abgeschaltet und nach einer vorgegebenen Zeit entsprechend einer vorgegebenen Rampenfunktion wieder hochgefahren.At the Occurrence of a punch, resulting in the collapse the filter voltage is noticeable, is in known controls the Voltage switched off and after a predetermined time accordingly restarted a predetermined ramp function.
Bei
einem aus der
Während der Zeit, in der das Filter spannungslos ist, ist auch keine Abscheidwirkung vorhanden. Ziel einer Regelung muß es also sein, diese Zeit möglichst kurz zu halten.During the Time, in which the filter is de-energized, is also no Abscheidwirkung available. The aim of a regulation must therefore be this time as possible to keep it short.
Diese Aufgabe wird durch ein Verfahren gelöst, bei dem nach Erkennung eines Filterdurchschlages über einen Spannungszusammenbruch der Filterstrom um einen vorgegebenen Prozentsatz abgesenkt wird, der Filterstrom sofort nach Wiederanstieg der Filterspannung auf einen vorgegebenen Wert angehoben wird und bei Nichtwiederkehr der Filterspannung nach einer vorgegebenen Wartezeit der Filterstrom abgeschaltet wird.These Task is solved by a method in which after detection a filter punch over a voltage breakdown of the filter current by a predetermined Percentage is lowered, the filter stream immediately after the recovery of the Filter voltage is raised to a predetermined value and at Non-return of the filter voltage after a predetermined waiting time the filter current is turned off.
Auf diese Weise wird im Regelfall die spannungslose, d.h. die abscheidungslose Zeit, nach einem Filterdurchschlag verkürzt, da die Lichtbogen bei Stromabsenkung sich häufig von selbst löschen. Dies beruht darauf, daß die sofortige Stromabsenkung eine starke Ionisierung der Durchbruchstrecke verhindert. Durch das gleichzeitig vorgesehene Abschalten des Stromes nach einer vorgegebenen Wartezeit, wird aber auch dafür gesorgt, daß ein durch die Stromabsenkung nicht gelöschter Lichtbogen innerhalb einer gewissen Zeitdauer gelöscht wird.On this way, as a rule, the dead-less, i. the uncaptured Time, shortened after a filter breakdown, as the arc at Current reduction is common delete by itself. This is based on the fact that the immediate current reduction prevents strong ionization of the breakdown section. By simultaneously switching off the stream after a given waiting time, but is also ensured that a through the Current reduction not extinguished Arc is deleted within a certain period of time.
Eine vorteilhafte Schaltung zur Durchführung des Verfahrens besteht in der Verwendung einer Spannungsversorgung mit einem Brückenwechselrichter, der z.B. die Stromrichtung mit einer Frequenz von 500 Hertz wechselt und dem zusätzlich noch eine Zweipunktstromregelung überlagert ist, die mit ca. 10 Kilohertz arbeitet. Mit einer solchen Anordnung kann aufgrund der kurzen Schaltzeiten bei Verwendung von IGBT innerhalb von einigen hundert Nanosekunden auf einen Filterdurchschlag reagiert werden.A advantageous circuit for carrying out the method consists in the use of a power supply with a bridge inverter, the e.g. the current direction changes at a frequency of 500 hertz and in addition still a two-point current control is superimposed, with about 10 kilohertz works. With such an arrangement may be due the short switching times when using IGBT within some a hundred nanoseconds to respond to a filter breakdown.
Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels sei die Erfindung näher erläutert; es zeigen:Based an embodiment shown in the drawing is the invention explained in more detail; it demonstrate:
Wie
aus
Wie
aus
Hätte sich im Zeitraum t0 bis z.B. dem Zeitpunkt t4 kein erneuter Anstieg der Filterspannung ergeben, d.h. hätte der Lichtbogen weiter bestanden, so würde dann zu diesem Zeitpunkt der Strom im Filter gänzlich abgeschaltet.If there had not been a renewed increase in the filter voltage in the period t 0 to, for example, the time t 4 , ie if the arc had continued to exist, then the current in the fil would be at this time completely switched off.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995101901 DE19501901B4 (en) | 1995-01-23 | 1995-01-23 | Method for controlling the filter flow of an electrostatic precipitator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995101901 DE19501901B4 (en) | 1995-01-23 | 1995-01-23 | Method for controlling the filter flow of an electrostatic precipitator |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19501901A1 DE19501901A1 (en) | 1996-07-25 |
DE19501901B4 true DE19501901B4 (en) | 2006-08-17 |
Family
ID=7752078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1995101901 Expired - Lifetime DE19501901B4 (en) | 1995-01-23 | 1995-01-23 | Method for controlling the filter flow of an electrostatic precipitator |
Country Status (1)
Country | Link |
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DE (1) | DE19501901B4 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4108811A1 (en) * | 1990-04-04 | 1991-10-10 | Siemens Ag | Regulating current supply to electro-filter - measuring parameters on primary side for regulation of filter voltage |
-
1995
- 1995-01-23 DE DE1995101901 patent/DE19501901B4/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4108811A1 (en) * | 1990-04-04 | 1991-10-10 | Siemens Ag | Regulating current supply to electro-filter - measuring parameters on primary side for regulation of filter voltage |
Also Published As
Publication number | Publication date |
---|---|
DE19501901A1 (en) | 1996-07-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8364 | No opposition during term of opposition | ||
R071 | Expiry of right |