EP0287137B1 - Emission electrode - Google Patents
Emission electrode Download PDFInfo
- Publication number
- EP0287137B1 EP0287137B1 EP88200422A EP88200422A EP0287137B1 EP 0287137 B1 EP0287137 B1 EP 0287137B1 EP 88200422 A EP88200422 A EP 88200422A EP 88200422 A EP88200422 A EP 88200422A EP 0287137 B1 EP0287137 B1 EP 0287137B1
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- European Patent Office
- Prior art keywords
- corona discharge
- section
- discharge electrode
- tubular cross
- electrodes
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- 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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- 239000002184 metal Substances 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract description 2
- 239000012717 electrostatic precipitator Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 description 38
- 238000001556 precipitation Methods 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004924 electrostatic deposition Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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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
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
Definitions
- the invention relates to a self-supporting, mast-like spray electrode for electrostatic dust separators with plate-shaped, gas lanes forming precipitation electrodes.
- Spray electrodes and precipitation electrodes are the most important components of an electrostatic dust collector. They are coordinated in shape and arrangement. In most cases, the precipitation electrodes are grounded while the spray electrodes are connected to a high voltage source. The dust particles to be separated are ionized by electrons emitted by the spray electrodes and deflected from the gas flow in the electrostatic field existing between spray electrodes and precipitation electrodes and finally deposited on the precipitation electrodes. At certain intervals, the precipitation electrodes in particular, but also the spray electrodes, are shaken by knocking, whereby the deposited dust is released and falls down into the dust collection bunker. The effectiveness of an electrostatic dust collector depends on how well the spray electrodes and precipitation electrodes are matched to their different punctures.
- Spray electrodes often consist of wires or tapes studded with points that are clamped in a frame.
- Associated precipitation electrodes are composed of profiled sheet metal strips to form walls of gas passages. Spray electrodes are arranged in the center of the gas lanes and aligned with their tips so that an optimal field for dust separation is formed (cf. DE-OS 3408839).
- the spray electrodes with wires stretched in frames can only be manufactured up to certain sizes in the workshop. Limits are set by the permissible dimensions during transport. In power plants in particular, however, there is a tendency towards ever larger units, with corresponding effects on the electrostatic dust separators. For example, a 740 MW power plant block requires two electrostatic dust collectors, each approximately 33 m long, 37 m wide and 23 m high. Each separator has a projected precipitation electrode area of around 70,000 m 2 and a total length of the spray electrodes of around 220 km (Z., "Technische Mitteilungen” (1978), number 3, pages 123 to 131).
- spray electrodes have also become known which consist of relatively rigid components, such as profiled plates, masts or the like (e.g. US Pat. No. 3,435,594, US Pat. No. 4,321,068).
- the design of the spray electrodes is decisive for the formation of the precipitation electrodes, i.e. the precipitation electrodes are adapted to the spray electrodes and not vice versa, as with the wires stretched in frames. This does not have to be a disadvantage. If, however, precipitation electrodes with an optimal profile shape have been developed for a concept with wires stretched in frames, one would of course also want to use them if the spray electrodes with wires stretched in frames are out of the question.
- the spray electrode is characterized by the fact that it can be produced practically without material waste from a sheet metal strip, which is given the rigidity required for such spray electrodes by the shape according to the invention and, because of the one-piece design between the supporting parts and the spray tips, does not require any connection points, which experience has shown in multi-part spray electrodes are the cause of high electrical contact resistance and increased risk of corrosion.
- a section of a mast-like spray electrode is shown in side view and cross section.
- the spray electrode is made from a sheet metal strip (1) of constant width, in that the sheet metal strip (1) has been formed into an approximately elliptical tube cross section (2).
- the longitudinal edges (3, 4) of the metal strip (1) are arranged to overlap and are connected to one another.
- Triangular tabs (5) are bent out of the tube cross-section (2) in such a way that on both sides of the elliptical tube cross-section (2) they form outward-pointing flags (6) in an extension of its main axis (H), the outermost parts of which in the height alternating spray tips (7, 8) represent.
- These outward-facing flags (6) are cut in the middle and their outermost parts are bent in opposite directions by about 70 ° to form two spray tips (7al7b, 8a / 8b).
- the length ratio of the main axis (H) to the minor axis (N) of the elliptical tube cross section (2) is expediently in the range 2.4 to 2.7 to 1.
- the length of the flag (6) is 85 to 90% of the length of the stretched state Main axis (H) of the elliptical tube cross section (2). It is also provided that the greatest distance (A) between the oppositely bent spray tips (8a and 8b) is 30 to 90% of the length of the main axis (H) of the pipe cross section (2).
- the longitudinal edges (3, 4) are expediently connected to one another by flanging or welding. It is also advantageous if the center distance (T) of the outwardly facing flag (6) is 80 to 85% of the length of the main axis (H) of the pipe cross section (2).
- the self-supporting, mast-like spray electrode fulfills all the requirements mentioned at the outset. It is particularly advantageous and can be produced practically without any waste of material, the required rigidity being achieved by shaping. It can be continuously produced in any length on appropriate machines, the sequence of punching and forming processes being rationally coordinated.
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- Electrostatic Separation (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cold Cathode And The Manufacture (AREA)
- Electroluminescent Light Sources (AREA)
- Lasers (AREA)
- Elimination Of Static Electricity (AREA)
- Holo Graphy (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine selbsttragende, mastartige Sprühelektrode für elektrostatische Staubabscheider mit plattenförmigen, Gasgassen bildenden Niederschlagselektroden.The invention relates to a self-supporting, mast-like spray electrode for electrostatic dust separators with plate-shaped, gas lanes forming precipitation electrodes.
Sprühelektroden und Niederschlagselektroden sind die wichtigsten Bauteile eines elektrostatischen Staubabscheiders. Sie sind in Formgebung und Anordnung aufeinander abgestimmt. In den meisten Fällen sind die Niederschlagselektroden geerdet, während die Sprühelektroden mit einer Hochspannungsquelle verbunden sind. Die abzuscheidenden Staubteilchen werden durch Elektronen, die von den Sprühelektroden abgegeben werden, ionisiert und in dem zwischen Sprühelektroden und Niederschlagselektroden bestehenden elektrostatischen Feld aus der Gasströmung abgelenkt und schließlich auf den Niederschlagselektroden abgeschieden. In bestimmten zeitlichen Abständen werden vor allem die Niederschlagselektroden, aber auch die Sprühelektroden durch Klopfschläge erschüttert, wodurch der abgesetzte Staub abgelöst wird und nach unten in Staubsammelbunker abfällt. Die Wirksamkeit eines elektrostatischen Staubabscheiders hängt davon ab, wie gut die Sprühelektroden und Niederschlagselektroden auf ihre verschiedenen Punktionen hin abgestimmt sind.Spray electrodes and precipitation electrodes are the most important components of an electrostatic dust collector. They are coordinated in shape and arrangement. In most cases, the precipitation electrodes are grounded while the spray electrodes are connected to a high voltage source. The dust particles to be separated are ionized by electrons emitted by the spray electrodes and deflected from the gas flow in the electrostatic field existing between spray electrodes and precipitation electrodes and finally deposited on the precipitation electrodes. At certain intervals, the precipitation electrodes in particular, but also the spray electrodes, are shaken by knocking, whereby the deposited dust is released and falls down into the dust collection bunker. The effectiveness of an electrostatic dust collector depends on how well the spray electrodes and precipitation electrodes are matched to their different punctures.
Sprühelektroden bestehen vielfach aus mit Spitzen besetzten Drähten oder Bändern, die in einen Rahmen eingespannt sind. Zugehörige Niederschlagselektroden sind aus profilierten Blechstreifen zu Gasgassen bildenden Wänden zusammengesetzt. Sprühelektroden sind mittig in den Gasgassen angeordnet und mit ihren Spitzen so ausgerichtet, daß ein für die Staubabscheidung optimales Feld gebildet wird (vgl. DE-OS 3408839).Spray electrodes often consist of wires or tapes studded with points that are clamped in a frame. Associated precipitation electrodes are composed of profiled sheet metal strips to form walls of gas passages. Spray electrodes are arranged in the center of the gas lanes and aligned with their tips so that an optimal field for dust separation is formed (cf. DE-OS 3408839).
Bei den in Rahmen eingespannten Sprühelektroden muß die Herstellung sehr sorgfältig ausgeführt werden, damit alle Bänder oder Drähte gleichmäßig gespannt sind. Zu geringe Spannung führt unter dem Einfluß des vorbeiströmenden Gases und der elektrischen Feldkräfte zu unkontrollierten Schwingungen und bei einer Verringerung des Abstandes zu den Niederschlagselektroden schließlich zu ungewollten Überschlägen. Bei zu hoher Spannung können die Bänder oder Drähte unter dem zusätzlichen Einfluß der Klopfschläge abreißen, wodurch die Abscheideleistung herabgesetzt wird und kostspielige Stillstandszeiten, insbesondere bei Kraftwerken, erzwungen werden. Es sind daher schon spezielle Werkzeuge zurgleichmäßigen Spannung der Elektroden vorgeschlagen worden (DE-OS 2603514).With the spray electrodes clamped in the frame, the production must be carried out very carefully so that all strips or wires are evenly tensioned. Too little voltage leads to uncontrolled vibrations under the influence of the gas flowing past and the electrical field forces and, if the distance to the precipitation electrodes is reduced, leads to undesired flashovers. If the tension is too high, the tapes or wires can tear under the additional influence of the knocking, which reduces the separation efficiency and forces costly downtimes, particularly in power plants. Special tools for uniform voltage of the electrodes have therefore already been proposed (DE-OS 2603514).
Die Sprühelektroden mit in Rahmen gespannten Drähten sind nur bis zu bestimmten Baugrößen in der Werkstatt herstellbar. Grenzen werden durch die zulässigen Abmessungen beim Transport gesetzt. Insbesondere bei Kraftwerken geht aber die Tendenz zu immer größeren Baueinheiten, mit entsprechenden Auswirkungen auf die elektrostatischen Staubabscheider. Für einen Kraftwerksblockvon 740 MW sind beispielsweise zwei elektrostatische Staubabscheider erforderlich, jeder mit einer Länge von rund 33 m, einer Breite von 37 m und einer Höhe von 23 m. Jeder Abscheider weist eine projezierte Niederschlagselektrodenfläche von rund 70.000 m2 und eine Gesamtlänge der Sprühelektroden von etwa 220 km auf (Z., "Technische Mitteilungen" (1978), Heft 3, Seiten 123 bis 131).The spray electrodes with wires stretched in frames can only be manufactured up to certain sizes in the workshop. Limits are set by the permissible dimensions during transport. In power plants in particular, however, there is a tendency towards ever larger units, with corresponding effects on the electrostatic dust separators. For example, a 740 MW power plant block requires two electrostatic dust collectors, each approximately 33 m long, 37 m wide and 23 m high. Each separator has a projected precipitation electrode area of around 70,000 m 2 and a total length of the spray electrodes of around 220 km (Z., "Technische Mitteilungen" (1978), number 3, pages 123 to 131).
Es ist ohne weiteres verständlich, daß man bei bis zu 15 m hohen Niederschlagselektroden nicht mehr einteilige Spannrahmen vorsehen kann. Aber selbst 7,5 m hohe und in Gasströmungsrichtung etwa 6 m breite Rahmen sind nicht mehr zu transportieren. Werden sie auf der Baustelle hergestellt, ist ein erheblicher Aufwand zur Einhaltung der zwangsläufig sehr engen Fertigungstoleranzen erforderlich. Davon abgesehen, sind solche groden Rahmen aber auch schwierig zu handhaben.It is readily understandable that one can no longer provide one-piece clamping frames with precipitation electrodes up to 15 m high. But even frames 7.5 m high and about 6 m wide in the direction of gas flow can no longer be transported. If they are manufactured on site, considerable effort is required to comply with the inevitably very tight manufacturing tolerances. Apart from that, such large frames are also difficult to handle.
Schließlich besteht bei manchen Betreibem von elektrostatischen Staubabscheidem eine Abneigung gegen Sprühelektroden mit in Rahmen gespannten Drähten, die zwar verhältnismäßig rasch montiert und ausgerichtet werden können, die aber eine Reparatur einzelner Drähte nicht gestatten. Es muß jeweils der gesamte Rahmen ausgebaut werden und nach dem Einziehen eines neuen Drahtes müssen wieder alle Drähte nachgespannt, zumindest auf gleichmaßige Spannung geprüft werden.Finally, some operators of electrostatic dust separators dislike spray electrodes with wires stretched in frames, which can be installed and aligned relatively quickly, but which do not allow the repair of individual wires. The entire frame must be removed in each case and after pulling in a new wire, all wires must be re-tensioned, at least checked for uniform tension.
Auf der anderen Seite sind auch schon Sprühelektroden bekanntgeworden, die aus verhältnismäßig starren Bauteilen, wie profilierten Platten, Masten oder dergleichen, bestehen (z.B. US-PS 3435594, US-PS 4321068). In diesen Fällen ist die konstruktive Gestaltung der Sprühelektroden maßgebend für die Ausbildung der Niederschlagselektroden, d.h. die Niederschlagselektroden werden an die Sprühelektroden angepaßt und nicht umgekehrt, wie bei den in Rahmen gespannten Drähten. Dies muß kein Nachteil sein. Wenn aber für eine Konzeption mit in Rahmen gespannten Drähten Niederschlagselektroden mit einer optimalen Profilform entwickelt worden sind, so möchte man diese selbstverständlich auch dann einsetzen, wenn die Sprühelektroden mit in Rahmen gespannten Drähten nicht in Betracht kommen.On the other hand, spray electrodes have also become known which consist of relatively rigid components, such as profiled plates, masts or the like (e.g. US Pat. No. 3,435,594, US Pat. No. 4,321,068). In these cases, the design of the spray electrodes is decisive for the formation of the precipitation electrodes, i.e. the precipitation electrodes are adapted to the spray electrodes and not vice versa, as with the wires stretched in frames. This does not have to be a disadvantage. If, however, precipitation electrodes with an optimal profile shape have been developed for a concept with wires stretched in frames, one would of course also want to use them if the spray electrodes with wires stretched in frames are out of the question.
Es besteht somit die Aufgabe, eine Konzeption für die Sprühelektroden vorzuschlagen, bei der keine in Rahmen gespannten Drähte oder Bänder vorkom- men, jedoch ohne daß ein vorgegebenes System von Niederschlagselektroden geändert werden muß.Thus, there is the problem of proposing a design for the discharge electrodes at which no frame in the tensioned wires or tapes without, however, that a given system must be changed by precipitation electrodes before k om- men.
Zur Lösung dieser Aufgabe wird eine Sprühelektrode vorgeschlagen, die dadurch gekennzeichnet ist, daß sie
- a) aus einem Blechstreifen von durchgehend gleicher Breite besteht, der
- b) zu einem etwa ellipsenförmigen Rohrquerschnitt geformt ist und dessen Längskanten überlappend miteinander verbunden sind, wobei
- c) aus dem Rohrquerschnitt etwa dreiecksförmige Laschen derart abgebogen sind, daß sie
- d) an beiden Seiten des elliptischen Rohrquerschnitts in Verlängerung von dessen Hauptachse nach außen weisende Fahnen bilden, deren
- e) am weitesten außen liegende Teile in der Höhe alternierend angeordnete Sprühspitzen darstellen.
- a) from a continuous sheet of metal the same width exists
- b) is shaped into an approximately elliptical tube cross section and its longitudinal edges are connected to one another in an overlapping manner, wherein
- c) from the tube cross section approximately triangular tabs are bent such that they
- d) form on both sides of the elliptical tube cross section in an extension of its main axis outward-pointing flags whose
- e) represent outermost parts of the spray tips arranged alternately in height.
Weitere Einzelheiten und Ausgestaltungen der erfindungsgemäßen Sprühelektrode finden sich in den Ansprüchen 2 bis 7.Further details and configurations of the spray electrode according to the invention can be found in
Die Sprühelektrode zeichnet sich dadurch aus, daß sie praktisch ohne Materialabfall aus einem Blechstreifen gefertigt werden kann, der durch die erfindungsgemäße Formgebung die für derartige Sprühelektroden erforderliche Steifigkeit erhält und wegen der einstückigen Ausbildung zwischen den tragenden Teilen und den Sprühspitzen keine Verbindungsstellen erfordert, die erfahrungsgemäß bei mehrteiligen Sprühelektroden die Ursache für hohe elektrische Übergangswiderstände und erhöhte Korrosionsgefahr sind.The spray electrode is characterized by the fact that it can be produced practically without material waste from a sheet metal strip, which is given the rigidity required for such spray electrodes by the shape according to the invention and, because of the one-piece design between the supporting parts and the spray tips, does not require any connection points, which experience has shown in multi-part spray electrodes are the cause of high electrical contact resistance and increased risk of corrosion.
Das gilt nicht für die mehrteilig ausgebildeten Sprühelectroden gemäß US-PS 4521229, die aus einem Rohr mit elliptischem Querschnitt und aufgesetzten Drahtabschnitten bestehen. Sie sind zwischen den Niederschlagselektroden so angeordnet, daß die Drahtabschnitte parallel zur Gasströmungsrichtung und den Niederschlagselektroden von den Rohren abstehen und daß die Hauptachse des elliptischen Querschnitts senkrecht zur Gasströmungsrichtung und den Niederschlagselektroden verläuft. Durch diese Anordnung wird erreicht, daß die Sprühelektroden senkrecht zu den Niederschlagselektroden eine höhere Biegesteifigkeit aufweisen als parallel zu den Niederschlagselektroden und daß der Abstand zwischen den Sprühelektroden und den Niederschlagselektroden während des Betriebs in den geforderten engen Grenzen konstant gehalten werden kann. Diese Anordnung bedingt aber auch eine verhältnismäßig starke Einschnürung des Gasströmungsquerschnitts im Bereich der Sprühelektroden. Erfahrungen haben gezeigt, daß solche Sprühelektroden, angeregt durch den Gasstrom, zu Schwingungen senkrecht zur Hauptachse des elliptischen Querschnitts neigen. Daraus resultieren Wechselbeanspruchungen, die im Resonanzfall nicht nur zum Abbrechen der Drahtabschnitte, sondern auch zur Beschädigung der Sprühelektroden an den oberen und unteren Befestigungen führen können. Die bekannten Sprühelektroden sind auch nur in Verbindung mit glatten Niederschlagselektroden anwendbar, weil alle Sprühspitzen den gleichen Abstand von den Niederschlagselektroden aufweisen. Für Niederschlagselektroden, die zur Optimierung des elektrostatischen Abscheidefeldes und zur Versteifung einen profilierten Querschnitt - beispielsweise gestreckt W-förmig (DE-OS 3408839) - aufweisen, sind sie nicht geeignet.This does not apply to the multi-part spray electrodes according to US-PS 4521229, which consist of a tube with an elliptical cross section and attached wire sections. They are arranged between the precipitation electrodes so that the wire sections project parallel to the gas flow direction and the precipitation electrodes from the tubes and that the main axis of the elliptical cross section runs perpendicular to the gas flow direction and the precipitation electrodes. This arrangement ensures that the spray electrodes perpendicular to the precipitation electrodes have a higher bending stiffness than parallel to the precipitation electrodes and that the distance between the spray electrodes and the precipitation electrodes can be kept constant during operation within the required narrow limits. However, this arrangement also requires a relatively strong constriction of the gas flow cross section in the area of the spray electrodes. Experience has shown that such spray electrodes, excited by the gas flow, tend to vibrate perpendicular to the main axis of the elliptical cross section. This results in alternating stresses, which in the event of resonance can lead not only to the wire sections breaking off but also to the spray electrodes being damaged on the upper and lower fastenings. The known spray electrodes can also only be used in conjunction with smooth precipitation electrodes because all spray tips are at the same distance from the precipitation electrodes. They are not suitable for precipitation electrodes which have a profiled cross section for optimizing the electrostatic deposition field and for stiffening - for example stretched W-shaped (DE-OS 3408839).
Weitere Einzelheiten werden anhand des in Fig. 1 dargestellten Ausführungsbeispiels näher erläutert. (Die ursprüngliche Fig. 2 ist ausgeschieden).Further details are explained in more detail with reference to the embodiment shown in FIG. 1. (The original Fig. 2 is eliminated).
Dargestellt ist ein Abschnitt einer mastartigen Sprühelektrode in Seitenansicht und Querschnitt. Die Sprühelektrode ist aus einem Blechstreifen (1) von gleichbleibender Breite hergestellt, indem der Blechstreifen (1) zu einem etwa ellipsenförmigen Rohrquerschnitt (2) umgeformt wurde. Die Längsränder (3, 4) des Blechstreifens (1) sind überlappend angeordnet und miteinander verbunden. Aus dem Rohrquerschnitt (2) sind dreiecksförmige Laschen (5) derart abgebogen, daß sie an beiden Seiten des elliptischen Rohrquerschnitts (2) in Verlängerung von dessen Hauptachse (H) nach außen weisende Fahnen (6) bilden, deren am weitesten außen liegende Teile in der Höhe altemierend angeordnete Sprühspitzen (7, 8) darstellen. Diese nach außen weisenden Fahnen (6) sind mittig eingeschnitten und ihre am weitesten außen liegende Teile unter Bildung von jeweils zwei Sprühspitzen (7al7b, 8a/8b) gegenläufig um etwa 70° abgebogen. Das Längenverhältnis von Hauptachse (H) zur Nebenachse (N) des elliptischen Rohrquerschnitts (2) liegt zweckmäßigerweise im Bereich 2,4 bis 2,7 zu 1. Die Länge der Fahne (6) beträgt in gestrecktem Zustand 85 bis 90% der Länge der Hauptachse (H) des elliptischen Rohrquerschnitts (2). Außerdem ist vorgesehen, daß der größte Abstand (A) zwischen den gegenläufig abgebogenen Sprühspitzen (8a und 8b) 30 bis 90% der Länge der Hauptachse (H) des Rohrquerschnitts (2) beträgt. Die Längskanten (3, 4) sind zweckmäßigerweise durch Bördelung oder Schweißen miteinander verbunden. Ferner ist es vorteilhaft, wenn der Mittenabstand (T) der nach außen weisenden Fahne (6) 80 bis 85% der Länge der Hauptachse (H) des Rohrquerschnitts (2) beträgt.A section of a mast-like spray electrode is shown in side view and cross section. The spray electrode is made from a sheet metal strip (1) of constant width, in that the sheet metal strip (1) has been formed into an approximately elliptical tube cross section (2). The longitudinal edges (3, 4) of the metal strip (1) are arranged to overlap and are connected to one another. Triangular tabs (5) are bent out of the tube cross-section (2) in such a way that on both sides of the elliptical tube cross-section (2) they form outward-pointing flags (6) in an extension of its main axis (H), the outermost parts of which in the height alternating spray tips (7, 8) represent. These outward-facing flags (6) are cut in the middle and their outermost parts are bent in opposite directions by about 70 ° to form two spray tips (7al7b, 8a / 8b). The length ratio of the main axis (H) to the minor axis (N) of the elliptical tube cross section (2) is expediently in the range 2.4 to 2.7 to 1. The length of the flag (6) is 85 to 90% of the length of the stretched state Main axis (H) of the elliptical tube cross section (2). It is also provided that the greatest distance (A) between the oppositely bent spray tips (8a and 8b) is 30 to 90% of the length of the main axis (H) of the pipe cross section (2). The longitudinal edges (3, 4) are expediently connected to one another by flanging or welding. It is also advantageous if the center distance (T) of the outwardly facing flag (6) is 80 to 85% of the length of the main axis (H) of the pipe cross section (2).
Die erfindungsgemäße selbsttragende, mastartige Sprühelektrode erfüllt alle eingangs genannten Forderungen. Sie ist besonders vorteilhaft und praktisch ohne jeden Materialabfall herstellbar, wobei durch Formgebung die erforderliche Steifigkeit erreicht wird. Sie kann auf entsprechenden Maschinen kontinuierlich in beliebiger Länge gefertigt werden, wobei die Abfolge von Stanz- und Umformvorgängen rationell aufeinander abzustimmen ist.The self-supporting, mast-like spray electrode fulfills all the requirements mentioned at the outset. It is particularly advantageous and can be produced practically without any waste of material, the required rigidity being achieved by shaping. It can be continuously produced in any length on appropriate machines, the sequence of punching and forming processes being rationally coordinated.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88200422T ATE68727T1 (en) | 1987-04-15 | 1988-03-07 | SPRAY ELECTRODE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3712726 | 1987-04-15 | ||
| DE19873712726 DE3712726A1 (en) | 1987-04-15 | 1987-04-15 | SPRAY ELECTRODE |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90109095.1 Division-Into | 1988-03-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0287137A2 EP0287137A2 (en) | 1988-10-19 |
| EP0287137A3 EP0287137A3 (en) | 1989-01-11 |
| EP0287137B1 true EP0287137B1 (en) | 1991-10-23 |
Family
ID=6325652
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90109095A Expired - Lifetime EP0398236B1 (en) | 1987-04-15 | 1988-03-07 | Emission electrode |
| EP88200422A Expired - Lifetime EP0287137B1 (en) | 1987-04-15 | 1988-03-07 | Emission electrode |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90109095A Expired - Lifetime EP0398236B1 (en) | 1987-04-15 | 1988-03-07 | Emission electrode |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4848986A (en) |
| EP (2) | EP0398236B1 (en) |
| JP (1) | JPS63278573A (en) |
| KR (1) | KR880012271A (en) |
| AT (2) | ATE68727T1 (en) |
| AU (1) | AU594295B2 (en) |
| BR (1) | BR8801800A (en) |
| CA (1) | CA1320156C (en) |
| DE (3) | DE3712726A1 (en) |
| ES (2) | ES2026993T3 (en) |
| IN (1) | IN168338B (en) |
| ZA (1) | ZA882670B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3816717A1 (en) * | 1988-05-17 | 1989-11-30 | Metallgesellschaft Ag | SPRAY ELECTRODE FOR ELECTROSTATIC DUST SEPARATORS |
| EP0437849A1 (en) * | 1990-01-17 | 1991-07-24 | Elex Ag | Emission electrode in an electrostatic dust separator |
| US5254155A (en) * | 1992-04-27 | 1993-10-19 | Mensi Fred E | Wet electrostatic ionizing element and cooperating honeycomb passage ways |
| EP0629449A3 (en) * | 1993-06-18 | 1995-02-15 | Scheuch Alois Gmbh | Compact electrofilter. |
| DE19727568C1 (en) * | 1997-06-28 | 1998-05-28 | Metallgesellschaft Ag | Spray electrode for electrostatic separator |
| CN100525924C (en) * | 2001-10-23 | 2009-08-12 | 吉康姆控股公司 | Discharge electrode |
| SE520901C2 (en) * | 2001-11-30 | 2003-09-09 | Bact System Ab | emission electrode |
| US20110056376A1 (en) * | 2007-07-12 | 2011-03-10 | Ohio University | Low cost composite discharge electrode |
| RU2448779C1 (en) * | 2010-08-31 | 2012-04-27 | Закрытое акционерное общество "Кондор-Эко" | Corona-forming electrode |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE458888C (en) * | 1924-09-23 | 1928-04-25 | Siemens Schuckertwerke Akt Ges | Spray electrode for electrical gas cleaning |
| US2505907A (en) * | 1946-10-31 | 1950-05-02 | Research Corp | Discharge electrode |
| GB855621A (en) * | 1958-07-24 | 1960-12-07 | Metallgesellschaft Ag | Improvements in or relating to electrostatic precipitators |
| FI41381B (en) * | 1960-05-12 | 1969-07-31 | Svenska Flaektfabriken Ab | |
| DE1557148A1 (en) * | 1966-10-28 | 1970-05-27 | Metallgesellschaft Ag | Plate-shaped spray electrode for electrostatic dust collectors |
| DE2603514C2 (en) * | 1976-01-30 | 1984-06-07 | Metallgesellschaft Ag, 6000 Frankfurt | Method and device for tensioning spray electrodes |
| GB1575404A (en) * | 1977-03-15 | 1980-09-24 | Sturtevant Gas Cleaning Ltd | Corona discharge electrodes |
| AU510540B2 (en) * | 1977-08-12 | 1980-07-03 | Hara Keiichi | Electrostatic dust precipitator |
| CA1146092A (en) * | 1979-10-11 | 1983-05-10 | Terence B.F. Cottrell | Non-welded discharge electrode |
| GB2070979A (en) * | 1980-02-25 | 1981-09-16 | Lodge Cottrell Ltd | Discharge electrodes for electrostatic precipitators |
| US4375364A (en) * | 1980-08-21 | 1983-03-01 | Research-Cottrell, Inc. | Rigid discharge electrode for electrical precipitators |
| US4521229A (en) * | 1983-11-01 | 1985-06-04 | Combustion Engineering, Inc. | Tubular discharge electrode for electrostatic precipitator |
| DE3408839A1 (en) * | 1984-03-10 | 1985-09-12 | Metallgesellschaft Ag, 6000 Frankfurt | PREPARATION ELECTRODE FOR DUST SEPARATOR |
| SE452855B (en) * | 1985-01-28 | 1987-12-21 | Flaekt Ab | the emission electrodes |
-
1987
- 1987-04-15 DE DE19873712726 patent/DE3712726A1/en not_active Withdrawn
- 1987-07-08 IN IN524/CAL/87A patent/IN168338B/en unknown
-
1988
- 1988-03-07 AT AT88200422T patent/ATE68727T1/en not_active IP Right Cessation
- 1988-03-07 EP EP90109095A patent/EP0398236B1/en not_active Expired - Lifetime
- 1988-03-07 DE DE8888200422T patent/DE3865722D1/en not_active Expired - Lifetime
- 1988-03-07 EP EP88200422A patent/EP0287137B1/en not_active Expired - Lifetime
- 1988-03-07 DE DE9090109095T patent/DE3876104D1/en not_active Expired - Lifetime
- 1988-03-07 ES ES198888200422T patent/ES2026993T3/en not_active Expired - Lifetime
- 1988-03-07 AT AT90109095T patent/ATE82528T1/en not_active IP Right Cessation
- 1988-03-07 ES ES199090109095T patent/ES2036074T3/en not_active Expired - Lifetime
- 1988-03-30 CA CA000562946A patent/CA1320156C/en not_active Expired - Fee Related
- 1988-04-13 US US07/181,306 patent/US4848986A/en not_active Expired - Fee Related
- 1988-04-14 BR BR8801800A patent/BR8801800A/en unknown
- 1988-04-14 AU AU14628/88A patent/AU594295B2/en not_active Ceased
- 1988-04-14 KR KR1019880004277A patent/KR880012271A/en not_active Application Discontinuation
- 1988-04-15 JP JP63093302A patent/JPS63278573A/en active Pending
- 1988-04-15 ZA ZA882670A patent/ZA882670B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0398236A1 (en) | 1990-11-22 |
| DE3876104D1 (en) | 1992-12-24 |
| ES2036074T3 (en) | 1993-05-01 |
| CA1320156C (en) | 1993-07-13 |
| IN168338B (en) | 1991-03-16 |
| JPS63278573A (en) | 1988-11-16 |
| EP0287137A2 (en) | 1988-10-19 |
| US4848986A (en) | 1989-07-18 |
| DE3712726A1 (en) | 1988-11-10 |
| ATE68727T1 (en) | 1991-11-15 |
| BR8801800A (en) | 1988-11-16 |
| EP0398236B1 (en) | 1992-11-19 |
| DE3865722D1 (en) | 1991-11-28 |
| ATE82528T1 (en) | 1992-12-15 |
| KR880012271A (en) | 1988-11-26 |
| ES2026993T3 (en) | 1992-05-16 |
| ZA882670B (en) | 1989-12-27 |
| EP0287137A3 (en) | 1989-01-11 |
| AU594295B2 (en) | 1990-03-01 |
| AU1462888A (en) | 1988-10-20 |
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