EP2352575A1 - Method for scrubbing a flue gas of a metallurgical plant and flue gas scrubbing apparatus - Google Patents

Method for scrubbing a flue gas of a metallurgical plant and flue gas scrubbing apparatus

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Publication number
EP2352575A1
EP2352575A1 EP09744067A EP09744067A EP2352575A1 EP 2352575 A1 EP2352575 A1 EP 2352575A1 EP 09744067 A EP09744067 A EP 09744067A EP 09744067 A EP09744067 A EP 09744067A EP 2352575 A1 EP2352575 A1 EP 2352575A1
Authority
EP
European Patent Office
Prior art keywords
flue gas
gas
scrubber
metallurgical plant
dust collector
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.)
Ceased
Application number
EP09744067A
Other languages
German (de)
French (fr)
Inventor
Ulrich Leibacher
Helmuth Ester
Christian Klein
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.)
SMS Elex AG
Original Assignee
SMS Elex AG
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 SMS Elex AG filed Critical SMS Elex AG
Publication of EP2352575A1 publication Critical patent/EP2352575A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
    • 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
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • 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
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/16—Plant or installations having external electricity supply wet type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/10—Intercepting solids by filters
    • F23J2217/102—Intercepting solids by filters electrostatic

Definitions

  • the invention relates to a method for purifying a flue gas of a metallurgical plant. Furthermore, the invention relates to a flue gas purification device.
  • the flue gas produced in a metallurgical plant must be sufficiently dedusted before being discharged to the environment in order to avoid environmental pollution. It is known to use wet scrubbers (for example DE 1176099 B) for which various types are possible. With such gas scrubbers can be done dedusting of the flue gas.
  • the BAUMCO scrubber is, as one skilled in the art knows, a typical representative of a wet dust removal system, as has been used, for example, in oxygen / air converters for decades.
  • the purification of the exhaust gas is carried out in two stages, wherein in a first step in a so-called quencher of the coarse dust is precipitated by spraying water into the gas stream and in a second step, the fine cleaning by an eddy current mixture of gas and scrubber water in a special designed scrubber unit is performed.
  • annular-gap scrubbers which are also known to the expert for a long time in the flue gas dedusting of metallurgical plants use, usually flows through hot water together with the hot gas in the co-current tube and deprives the hot gas sensible heat, whereby a large amount of steam is formed and the gas at least approximately until is enriched to its saturation limit with water vapor.
  • entrained by the gas ultrafine particles are wetted to a large extent and serve in a subsequent stages in the stages of condensation of water as germ cells for drop formation.
  • the particles are then eliminated together with the drops in the condensate.
  • electrostatic precipitators are available in two types: In dry electrostatic precipitators, the high-pressure gas is cooled and conditioned in a conditioning tower by means of evaporation. The dust is then separated electrostatically. The separated dust falls dry in this process variant. The cleaning of the electrodes required in the separator takes place by mechanical tapping.
  • the purified flue gas if it has a sufficiently high chemical calorific value, can be absorbed for further use: in the case of converter steelworks, a dry electrostatic filter is used, this is referred to as so-called e.g. Lurgi-Thyssen steel gas process.
  • a dry electrostatic filter in this case, dry electrostatic precipitators in round design are used for emission control.
  • this type of electric filter With this type of electric filter, the low amount of clean gas dust required in the useful gas is easily achieved, whereby this steel gas process offers decisive advantages over conventional scrubbing systems, in particular a lower energy requirement, a dry dust separation and low maintenance costs.
  • wet electrostatic precipitators for flue gas cleaning.
  • the exhaust gas is cooled in a first step to saturation temperature in a conditioning tower and then also electrostatically deposited.
  • the electrodes are cleaned by rinsing.
  • the present invention is therefore based on the object of developing a method of the type mentioned above and to provide a Rauchgastherapiesvor- direction, with which it is possible or easier to comply with strict limits for the dedusting of a flue gas. This should be possible in an energetically favorable mode of operation. In addition, the investment level should be kept as low as possible and the maintenance costs reduced by a simple design.
  • the solution of this problem by the invention is characterized by the following process steps: a) introducing the flue gas into a gas scrubber, wherein the flue gas stream in the scrubber with a liquid, in particular with water, is brought into contact. By gravity and wetting with water dust particles are separated from the gas stream and rinsed with the wash water. b) feeding the flue gas pre-cleaned in the gas scrubber into a wet
  • Electrostatic precipitator wherein the flue gas stream is further removed by electrostatic separation of particles from the flue gas.
  • the flue gas is preferably passed directly from the gas scrubber into the electric dust collector.
  • the flue gas can be cooled on its way from the metallurgical plant to the gas scrubber. It can be passed behind the electric dust collector in a fireplace, or if energetically usable gas extraction are supplied.
  • the flue gas is preferably cooled in the gas scrubber.
  • the cooling of the flue gas in the gas scrubber is preferably carried out to saturation temperature.
  • the flue gas is cleaned in the gas scrubber so that it with a dust amount, e.g. less than 1.0 g / Nm3 to ensure a permanently satisfactory performance of the wet electrostatic precipitator.
  • the electric dust collector has at least one collecting electrode, wherein the cleaning of the at least one collecting electrode preferably takes place by rinsing with a liquid, in particular with water.
  • the melt metallurgical plant is preferably a converter, a blast furnace or an electric furnace.
  • the proposed flue gas purification device of a metallurgical plant comprises a gas scrubber connected via a connecting line to the metallurgical plant and a wet electrostatic precipitator connected to the gas scrubber via a further connecting line.
  • the connecting line between the metallurgical plant and the gas scrubber can be formed at least in sections as a cooling chimney. Behind the wet electrostatic filter, a chimney with a flaring device can be arranged. In a connecting line between the wet electrostatic precipitator and the fireplace can be arranged a fan. If a gas recovery is desired, a switching station can be arranged between fan and chimney.
  • the basic idea of the invention therefore depends on the combination of two methods known per se.
  • a gas scrubbing operation is coupled with an electrostatic dust removal operation. Both techniques are strengthened by the combination, i. the advantages of the respective procedures are used better and the respective weaknesses are no longer significant.
  • the scrubber is no longer used for dedusting to clean gas dust content, but the pre-cleaning and conditioning of the exhaust stream. These are favorable conditions for trouble-free and efficient operation of the subsequent wet electrostatic precipitator.
  • the gas scrubber thus only reduces the dust content in the flue gas to such an extent that reliable operation of the downstream electric dust collector can be ensured.
  • the gas scrubber can therefore be operated with less pressure loss. Overall, this results in a lower energy consumption for the fan. Thus, the operating costs can be reduced.
  • the following wet electrostatic filter is designed in its construction and operating mode to the pre-cleaned and conditioned gas stream. As a result, it can be built smaller than conventional wet electrostatic precipitators. Its installations and controls are optimized according to the new size.
  • the electric dust collector takes over the cleaning of the flue gas to the final dust content of the clean gas.
  • a further advantage is the simple cleaning of the electrodes of the wet electrostatic precipitator by rinsing.
  • the service life of the electrodes in the electrostatic precipitator is achieved by pre-cleaning the gas in the scrubber. increased.
  • the cleaning of the electrodes in the wet electrostatic precipitator is considerably easier than in the dry electrostatic precipitator. Smoldering fires are excluded in the wet electrostatic precipitator. The risk of explosion is reduced in the water-saturated flue gas.
  • the size reduction of the electric dust collector which is made possible by the reduced gas temperature in the pre-cleaning, results in advantages in terms of investment volume.
  • the preferred application of the proposed idea is the gas cleaning of steel works, in particular the cleaning of the exhaust gases of metallurgical vessels such as converters and electric furnace. This applies to the production of standard steels and stainless steels.
  • FIG. 1 An embodiment of the invention is shown.
  • the single figure shows schematically the structure of a flue gas cleaning device for a metallurgical plant.
  • the illustrated flue gas cleaning device serves to purify the flue gas which originates from a metallurgical plant 1.
  • the flue gas is conveyed via a connecting line 5 in the form of a chimney of the cleaning fed direction.
  • the connecting line 5 is already designed as a cooling section for the flue gas to be cleaned.
  • the pre-cooled gas is pre-cleaned in the gas scrubber 2, with a pure dust content of preferably less than 1 g / Nm3 (grams per standard cubic meter) is sought.
  • the flue gas cleaning device consists essentially of two directly interconnected filter systems, namely a gas scrubber 2, which is connected via a connecting line 6 with an electric dust collector 3.
  • the electric dust collector 3 is designed as a wet electrostatic precipitator.
  • the water management 10 supplies the system with the supply and discharge of the water or washing liquid.
  • Both the gas scrubber 2 and the wet electrostatic filter 3 operate in a known manner.
  • the gas stream to be cleaned is brought into contact with a liquid stream to receive components of the gas stream in the liquid.
  • the passing components of the gas stream may be solid, liquid or gaseous constituents.
  • washing liquid pure solvents such as water but also suspensions can be used.
  • the gas scrubber often has six areas: In the bottom of the gas scrubber, the scrubbing liquid is collected and withdrawn in the gas inlet, the gas is given and installed by a uniform load on the interior, in the contact section, the leaching of the gas stream in the constituents takes place in the washing liquid is added to the washing liquid and distributed, are entrained in the drip ne components of the washing liquid deposited and leaving the purified gas stream in the outlet, the gas scrubber.
  • the scrubbing liquid is sprayed through the gas at high speed and in small drops.
  • the gas must pass through the scrubbing liquid like through a curtain. If the drops of the washing liquid are fast enough, the particles in the gas stream can no longer escape the drop and fuse with them to larger drops. These larger drops can then be separated with the drip.
  • the conditioning tower otherwise required for dry electrostatic precipitators is eliminated.
  • the electric dust collector 3 can be made relatively small.
  • the wet electrostatic precipitator 3 is equally a plant for the separation of particles from gases, which is based on the electrostatic principle.
  • the separation in the electrostatic precipitator usually takes place in five phases: First, the generation of the electrical charges takes place, then the charging of the dust particles takes place in the electric field. Subsequently, the transport of the charged dust particles to the collecting electrode takes place. The dust particles then adhere to the collecting electrode. Finally, the cleaning of the dust layer from the electrodes is carried out by the washing liquid.
  • the wet electrostatic filter can be made significantly smaller than would be the case if the upstream scrubber 2 were dispensed with. Furthermore, the wear of the electrodes is reduced by the abrasive dusts in that already precleaned gas is introduced.
  • Another advantage of the proposed system in plants that are operated in batch mode - for example, a converter steelworks, is that during the process phase, in which hot dust-laden flue gas is produced, the Washing liquid is used for the gas scrubber. In the phase in which no flue gas is produced, the available washing liquid can be diverted into the wet electrostatic precipitator to clean the electrodes.
  • the now purified gas stream is conducted via a connecting line 8 into a chimney 4, at the upper end of which a flaring device 7 is arranged.
  • a gas switching station can be installed, which - depending on the process phase - diverts process gases with a chemical calorific value into a gas container.
  • the transport of the gas is accomplished by a blower 9, which is integrated into the conduit 8. If gas recovery is desired, a switching station is arranged between the fan 9 and the chimney 4.
  • the proposed hydro-hybrid filter system is therefore an advanced dedusting technology.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrostatic Separation (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention relates to a method for scrubbing a flue gas from a metallurgical plant (1), in particular removing dust from it, comprising the following steps: a) introducing the flue gas into a gas scrubber (2), wherein the flue gas stream is brought into contact with a liquid, in particular water, in the gas scrubber (2), in order to transfer particles from the flue gas to the liquid, and b) feeding the flue gas, which has been prescrubbed in the gas scrubber (2), into a wet electrostatic filter (3), wherein the flue gas stream is further freed of particles from the flue gas in this electrostatic dust separator (3). This allows an energetically advantageous and efficient filtering of particles out of the flue gas. In addition, the invention relates to a flue gas scrubbing apparatus.

Description

Verfahren zur Reinigung eines Rauchgases einer metallurgischen Anlage und Rauchgasreinigungsvorrichtung Process for purifying a flue gas of a metallurgical plant and flue gas purification device
Die Erfindung betrifft ein Verfahren zur Reinigung eines Rauchgases einer metallurgischen Anlage. Des Weiteren betrifft die Erfindung einer Rauchgasreinigungsvorrichtung.The invention relates to a method for purifying a flue gas of a metallurgical plant. Furthermore, the invention relates to a flue gas purification device.
Das in einer metallurgischen Anlage, wie beispielsweise in einem Konverter oder in einem Elektroofen, entstehende Rauchgas muss vor der Abgabe an die Umgebung hinreichend entstaubt werden, um Umweltverschmutzung zu vermeiden. Bekannt ist es, hierfür Nasswäscher (z.B. DE 1176099 B) einzusetzen, wofür verschiedene Bauarten möglich sind. Mit solchen Gaswäschern kann eine Entstaubung des Rauchgases erfolgen.The flue gas produced in a metallurgical plant, such as in a converter or in an electric furnace, must be sufficiently dedusted before being discharged to the environment in order to avoid environmental pollution. It is known to use wet scrubbers (for example DE 1176099 B) for which various types are possible. With such gas scrubbers can be done dedusting of the flue gas.
Der BAUMCO-Wäscher ist, wie der Fachmann weiß, ein typischer Vertreter eines Nass-Entstaubungssystems, wie beispielsweise in Sauerstoff- Blaskonkonvertern schon seit Jahrzehnten Anwendung findet. Prinzipiell wird die Reinigung des Abgases in zwei Stufen durchgeführt, wobei in einem ersten Schritt in einem so genannten Quenscher der grobe Staub durch Einsprühen von Wasser in den Gasstrom ausgefällt wird und in einem zweiten Schritt die Feinreinigung durch eine Wirbelstrommischung aus Gas und Wäscherwasser in einer speziell gestalteten Wäschereinheit durchgeführt wird.The BAUMCO scrubber is, as one skilled in the art knows, a typical representative of a wet dust removal system, as has been used, for example, in oxygen / air converters for decades. In principle, the purification of the exhaust gas is carried out in two stages, wherein in a first step in a so-called quencher of the coarse dust is precipitated by spraying water into the gas stream and in a second step, the fine cleaning by an eddy current mixture of gas and scrubber water in a special designed scrubber unit is performed.
In Ringspalt-Wäschern, die ebenfalls wie dem Fachmann bekannt seit langem in der Rauchgasentstaubung metallurgischer Anlagen Verwendung finden, durchströmt üblichwerweise Heißwasser gemeinsam mit dem heißen Gas im Gleichstrom ein Rohr und entzieht dem heißen Gas fühlbare Wärme, wodurch eine große Dampfmenge gebildet wird und das Gas zumindest annähernd bis an seine Sättigungsgrenze mit Wasserdampf angereichert wird. Hierdurch werden die vom Gas mitgeführten ultrafeinen Partikel zu einem großen Teil benetzt und bei einer in nachfolgenden Stufen erfolgenden Kondensation des Wassers als Keimzellen für die Tropfenbildung dienen. Hierbei werden dann die Partikel zusammen mit den Tropfen im Kondensat ausgeschieden.In annular-gap scrubbers, which are also known to the expert for a long time in the flue gas dedusting of metallurgical plants use, usually flows through hot water together with the hot gas in the co-current tube and deprives the hot gas sensible heat, whereby a large amount of steam is formed and the gas at least approximately until is enriched to its saturation limit with water vapor. As a result, entrained by the gas ultrafine particles are wetted to a large extent and serve in a subsequent stages in the stages of condensation of water as germ cells for drop formation. Here, the particles are then eliminated together with the drops in the condensate.
Alternativ ist es auch bekannt, zur Entstaubung elektrostatische Staubabscheider einzusetzen. Derartige Elektrofilter gibt es in zwei Bauarten: Bei Trocken- Elektrofilter wird das Rauschgas in einem Konditionierungsturm mittels Verdampfung gekühlt und konditioniert. Anschliessend wird der Staub elektrosta- tisch abgeschieden. Der abgeschiedene Staub fällt in dieser Verfahrensvariante trocken an. Das Reinigen der im Abscheider benötigten Elektroden erfolgt durch mechanisches Klopfen.Alternatively, it is also known to use for dedusting electrostatic dust. Such electrostatic precipitators are available in two types: In dry electrostatic precipitators, the high-pressure gas is cooled and conditioned in a conditioning tower by means of evaporation. The dust is then separated electrostatically. The separated dust falls dry in this process variant. The cleaning of the electrodes required in the separator takes place by mechanical tapping.
Bei beiden Verfahrensvarianten kann das gereinigte Rauchgas, wenn es einen genügend grossen chemischen Heizwert besitzt, zur weiteren Nutzung aufge- fangen werden: bei Konverterstahlwerken dazu ein Trocken-Elektrofilter ein, spricht man vom sogenannten z.B. Lurgi-Thyssen Stahlgasverfahren. Hierbei werden Trocken-Elektrofilter in Rundbauweise zur Abgasreinigung eingesetzt. Mit diesem Elektrofiltertyp werden die in Nutzgas notwendigen niedrigen Rein- gasstaubmenge problemlos erreicht, wobei dieses Stahlgasverfahren entschei- dende Vorteile gegenüber konventionellen Wäschersystemen bietet, nämlich insbesondere einen geringeren Energiebedarf, eine trockene Staubabscheidung sowie niedrige Wartungskosten.In both variants of the method, the purified flue gas, if it has a sufficiently high chemical calorific value, can be absorbed for further use: in the case of converter steelworks, a dry electrostatic filter is used, this is referred to as so-called e.g. Lurgi-Thyssen steel gas process. In this case, dry electrostatic precipitators in round design are used for emission control. With this type of electric filter, the low amount of clean gas dust required in the useful gas is easily achieved, whereby this steel gas process offers decisive advantages over conventional scrubbing systems, in particular a lower energy requirement, a dry dust separation and low maintenance costs.
Darüber hinaus ist es bekannt Nass-Elektrofilter zur Rauchgasreinigung einzu- setzen. Bei Nass-Elektrofiltern wird das Abgas in einem ersten Schritt bis auf Sättigungstemperatur in einem Konditionierungsturm abgekühlt und anschliessend ebenfalls elektrostatisch abgeschieden. Die Reinigung der Elektroden erfolgt durch Spülen. Diese vorbekannten Verfahren zur Reinigung des Rauchgases weisen verschiedene Nachteile auf:In addition, it is known to use wet electrostatic precipitators for flue gas cleaning. In wet electrostatic precipitators, the exhaust gas is cooled in a first step to saturation temperature in a conditioning tower and then also electrostatically deposited. The electrodes are cleaned by rinsing. These prior art methods for purifying the flue gas have several disadvantages:
Im Falle des Einsatzes eines Gaswäschers sind die strengen Grenzwerte für den Reinigungsgrad des gefilterten Rauchgases nur schwer zu erreichen und erfordern eine hohe Gebläseenergie wegen des benötigten Differentialdrucks. Im Falle des Einsatzes eines Elektrofilters ist eine aufwändige Konstruktion für den speziellen Anwendungsfall entzündlicher Gase notwendig . Die abgeschiedenen Stäube im Trocken-Elekrofilter sind zudem pyrophor. Hierdurch kann es zu Glimmbränden auf den Elektroden kommen, was die Standzeiten der Elektroden entsprechend reduziert. Für Nass-Elektrofilter gilt, dass diese grundsätzlich nicht für hohe Staubbelastungen geeignet sind.In the case of using a gas scrubber, the strict limit values for the degree of purification of the filtered flue gas are difficult to achieve and require a high blower energy because of the required differential pressure. In the case of the use of an electrostatic precipitator, a complex construction is necessary for the special application of flammable gases. The separated dusts in the dry Elekrofilter are also pyrophoric. This can lead to glowing fires on the electrodes, which reduces the service life of the electrodes accordingly. For wet electrostatic precipitators, these are generally not suitable for high dust loads.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art so fortzubilden und eine Rauchgasreinigungsvor- richtung zu schaffen, mit dem bzw. mit der es möglich ist, leichter strenge Grenzwerte für die Entstaubung eines Rauchgases einzuhalten. Dies soll in einer energetisch günstigen Betriebsweise möglich werden. Zudem soll durch eine einfache Bauweise das Investitionsniveau so gering wie möglich gehalten und die Unterhaltskosten gesenkt werden.The present invention is therefore based on the object of developing a method of the type mentioned above and to provide a Rauchgasreinigungsvor- direction, with which it is possible or easier to comply with strict limits for the dedusting of a flue gas. This should be possible in an energetically favorable mode of operation. In addition, the investment level should be kept as low as possible and the maintenance costs reduced by a simple design.
Die Lösung dieser Aufgabe durch die Erfindung zeichnet sich durch die folgenden Verfahrensschritte aus: a) Einleiten des Rauchgases in einen Gaswäscher, wobei der Rauchgasstrom im Gaswäscher mit einer Flüssigkeit, insbesondere mit Wasser, in Kontakt gebracht wird. Durch Gravitation sowie Benetzung mit Wasser werden Staubpartikel vom Gasstrom getrennt und mit dem Waschwasser ausgespült. b) Zuleiten des im Gaswäscher vorgereinigten Rauchgases in ein Nass-The solution of this problem by the invention is characterized by the following process steps: a) introducing the flue gas into a gas scrubber, wherein the flue gas stream in the scrubber with a liquid, in particular with water, is brought into contact. By gravity and wetting with water dust particles are separated from the gas stream and rinsed with the wash water. b) feeding the flue gas pre-cleaned in the gas scrubber into a wet
Elektrofilter, wobei der Rauchgasstrom durch elektrostatische Abscheidung weiter von Partikeln aus dem Rauchgas befreit wird. Das Rauchgas wird vom Gaswäscher vorzugsweise unmittelbar in den Elektro- Staubabscheider geleitet. Das Rauchgas kann auf seinem Weg von der metal- lurgischen Anlage zum Gaswäscher gekühlt werden. Es kann hinter dem Elektro-Staubabscheider in einen Kamin geleitet werden, oder falls energetisch verwendbar der Gasgewinnung zugeführt werden.Electrostatic precipitator, wherein the flue gas stream is further removed by electrostatic separation of particles from the flue gas. The flue gas is preferably passed directly from the gas scrubber into the electric dust collector. The flue gas can be cooled on its way from the metallurgical plant to the gas scrubber. It can be passed behind the electric dust collector in a fireplace, or if energetically usable gas extraction are supplied.
Das Rauchgas wird vorzugsweise im Gaswäscher gekühlt. Die Kühlung des Rauchgases im Gaswäscher erfolgt dabei bevorzugt bis auf Sättigungstemperatur. Das Rauchgas wird im Gaswäscher so gereinigt, dass es diesen mit einer Staubmenge z.B. geringer als 1 ,0 g/Nm3 verlässt, um eine dauerhaft zufriedenstellende Leistung des Nass-Elektrofilters zu gewährleisten. Der Elektro-Staubabscheider weist mindestens eine Niederschlagselektrode auf, wobei die Reinigung der mindestens einen Niederschlagselektrode vorzugsweise durch Spülung mit einer Flüssigkeit, insbesondere mit Wasser, erfolgt.The flue gas is preferably cooled in the gas scrubber. The cooling of the flue gas in the gas scrubber is preferably carried out to saturation temperature. The flue gas is cleaned in the gas scrubber so that it with a dust amount, e.g. less than 1.0 g / Nm3 to ensure a permanently satisfactory performance of the wet electrostatic precipitator. The electric dust collector has at least one collecting electrode, wherein the cleaning of the at least one collecting electrode preferably takes place by rinsing with a liquid, in particular with water.
Die schmelzmetallurgische Anlage ist bevorzugt ein Konverter, ein Hochofen oder ein Elektroofen.The melt metallurgical plant is preferably a converter, a blast furnace or an electric furnace.
Die vorgeschlagene Rauchgasreinigungsvorrichtung einer metallurgischen Anlage weist erfindungsgemäss einen über eine Verbindungsleitung mit der metallurgischen Anlage verbundenen Gaswäscher und einen über eine weitere Verbindungsleitung mit dem Gaswäscher verbundenen Nasselektrofilter auf.The proposed flue gas purification device of a metallurgical plant according to the invention comprises a gas scrubber connected via a connecting line to the metallurgical plant and a wet electrostatic precipitator connected to the gas scrubber via a further connecting line.
Die Verbindungsleitung zwischen der metallurgischen Anlage und dem Gaswäscher kann dabei zumindest abschnittsweise als Kühlkamin ausgebildet sein. Hinter dem Nass-Elektrofilter kann ein Kamin mit einer Abfackeleinrichtung angeordnet sein. In einer Verbindungsleitung zwischen dem Nass-Elektrofilter und dem Kamin kann ein Gebläse angeordnet werden. Wird eine Gasrückgewinnung angestrebt, kann zwischen Gebläse und Kamin eine Umschaltstation angeordnet werden.The connecting line between the metallurgical plant and the gas scrubber can be formed at least in sections as a cooling chimney. Behind the wet electrostatic filter, a chimney with a flaring device can be arranged. In a connecting line between the wet electrostatic precipitator and the fireplace can be arranged a fan. If a gas recovery is desired, a switching station can be arranged between fan and chimney.
Der Grundgedanke der Erfindung stellt also auf die Kombination zweier an sich bekannter Verfahren ab. Ein Gaswaschvorgang wird mit einem Elektro- Staubabscheidevorgang gekoppelt. Beide Techniken stärken sich durch die Kombination, d.h. die Vorteile der jeweiligen Verfahren werden verbessert genutzt und die jeweiligen Schwächen fallen nicht mehr ins Gewicht.The basic idea of the invention therefore depends on the combination of two methods known per se. A gas scrubbing operation is coupled with an electrostatic dust removal operation. Both techniques are strengthened by the combination, i. the advantages of the respective procedures are used better and the respective weaknesses are no longer significant.
Der Gaswäscher dient nicht mehr der Entstaubung auf Reingasstaubgehalt, sondern der Vorreinigung und Konditionierung des Abgasstromes. Dies sind günstige Voraussetzungen für einen störungsfreien und effizienten Betrieb des nachfolgenden Nass-Elektrofilters. Der Gaswäscher reduziert also den Staubgehalt im Rauchgas nur soweit, als dass ein zuverlässiger Betrieb des nachfol- genden Elektro-Staubabscheiders gewährleistet werden kann. Der Gaswäscher kann daher mit geringerem Druckverlust betrieben werden. Insgesamt ergibt sich hierdurch ein geringerer Energieaufwand für das Gebläse. Somit können die Betriebskosten gesenkt werden.The scrubber is no longer used for dedusting to clean gas dust content, but the pre-cleaning and conditioning of the exhaust stream. These are favorable conditions for trouble-free and efficient operation of the subsequent wet electrostatic precipitator. The gas scrubber thus only reduces the dust content in the flue gas to such an extent that reliable operation of the downstream electric dust collector can be ensured. The gas scrubber can therefore be operated with less pressure loss. Overall, this results in a lower energy consumption for the fan. Thus, the operating costs can be reduced.
Das nachfolgende Nass-Elektrofilter ist in seiner Bau- und Betriebsart auf den vorgereinigten und konditionierten Gasstrom ausgelegt. Dadurch kann er kleiner als herkömmliche Nass-Elektrofilter gebaut werden. Dessen Einbauten und Steuerung werden entsprechend der neuen Grosse optimiert. Der Elektro- Staubabscheider übernimmt die Reinigung des Rauchgases auf den endgülti- gen Staubgehalt des Reingases.The following wet electrostatic filter is designed in its construction and operating mode to the pre-cleaned and conditioned gas stream. As a result, it can be built smaller than conventional wet electrostatic precipitators. Its installations and controls are optimized according to the new size. The electric dust collector takes over the cleaning of the flue gas to the final dust content of the clean gas.
Vorteilhaft ist weiterhin die einfache Reinigung der Elektroden des Nass- Elektrofilters durch Spülen. Die Standzeit der Elektroden im Elektro- Staubabscheider wird durch die Vorreinigung des Gases im Gaswäscher er- höht. Die Reinigung der Elektroden im Nass-Elektrofilter ist erheblich einfacher als im Trocken-Elektrofilter. Glimmbrände sind im Nass-Elektrofilter ausgeschlossen. Die Explosionsgefahr ist im mit Wasser gesättigten Rauchgas vermindert.A further advantage is the simple cleaning of the electrodes of the wet electrostatic precipitator by rinsing. The service life of the electrodes in the electrostatic precipitator is achieved by pre-cleaning the gas in the scrubber. increased. The cleaning of the electrodes in the wet electrostatic precipitator is considerably easier than in the dry electrostatic precipitator. Smoldering fires are excluded in the wet electrostatic precipitator. The risk of explosion is reduced in the water-saturated flue gas.
Die Grössenreduktion des Elektro-Staubabscheiders, die durch die reduzierte Gastemperatur in der Vorreinigung möglich wird, ergibt Vorteile bezüglich des Investitionsvolumens.The size reduction of the electric dust collector, which is made possible by the reduced gas temperature in the pre-cleaning, results in advantages in terms of investment volume.
Vorteilhaft ist auch eine einfache Möglichkeit der Nachrüstung der erfindungs- gemässen Idee an bestehenden Anlagen. Neben der Ausrüstung von Neuanlagen ist es auch möglich, mit dem erfind ungsgemässen Konzept bestehende Anlagen, die nur mit einem Gaswäscher ausgerüstet sind, nachzurüsten. Der besondere Vorteil liegt hierbei darin, dass die vorhandenen Komponenten der bestehenden Anlage, wie z.B. Gebläse und die Wasserwirtschaft, weiter ver- wendet werden können.Also advantageous is a simple possibility of retrofitting the idea according to the invention to existing systems. In addition to the equipment of new plants, it is also possible to retrofit with the concept according to the invention existing plants that are equipped only with a gas scrubber. The particular advantage here is that the existing components of the existing system, such. Blower and the water industry can continue to be used.
Die bevorzugte Anwendung der vorgeschlagenen Idee ist die Gasreinigung bei Stahlwerken, insbesondere die Reinigung der Abgase von metallurgischen Ge- fässen wie Konvertern und Elektroofen. Dies gilt für die Herstellung von Nor- malstählen und Edelstahlen.The preferred application of the proposed idea is the gas cleaning of steel works, in particular the cleaning of the exhaust gases of metallurgical vessels such as converters and electric furnace. This applies to the production of standard steels and stainless steels.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die einzige Figur zeigt schematisch den Aufbau einer Rauchgasreinigungsvorrichtung für eine metallurgische Anlage.In the drawing, an embodiment of the invention is shown. The single figure shows schematically the structure of a flue gas cleaning device for a metallurgical plant.
Die dargestellte Rauchgasreinigungsvorrichtung dient der Reinigung des Rauchgases, das von einer metallurgischen Anlage 1 stammt. Das Rauchgas wird über eine Verbindungsleitung 5 in Form eines Kamins der Reinigungsvor- richtung zugeführt. Die Verbindungsleitung 5 ist bereits als Kühlstrecke für das zu reinigende Rauchgas ausgelegt. Das vorgekühlte Gas wird im Gaswäscher 2 vorgereinigt, wobei ein Reingasstaubgehalt von vorzugsweise weniger als 1 g/Nm3 (Gramm pro Normkubikmeter) angestrebt wird.The illustrated flue gas cleaning device serves to purify the flue gas which originates from a metallurgical plant 1. The flue gas is conveyed via a connecting line 5 in the form of a chimney of the cleaning fed direction. The connecting line 5 is already designed as a cooling section for the flue gas to be cleaned. The pre-cooled gas is pre-cleaned in the gas scrubber 2, with a pure dust content of preferably less than 1 g / Nm3 (grams per standard cubic meter) is sought.
Die Rauchgasreinigungsvorrichtung besteht im Wesentlichen aus zwei direkt miteinander verbundenen Filteranlagen, nämlich aus einem Gaswäscher 2, der über eine Verbindungsleitung 6 mit einem Elektro-Staubabscheider 3 verbunden ist. Der Elektro-Staubabscheider 3 ist als Nass-Elektrofilter ausgebildet. Die Wasserwirtschaft 10 versorgt das System mit der Zu- und Ableitung des Was- sers bzw. Waschflüssigkeit.The flue gas cleaning device consists essentially of two directly interconnected filter systems, namely a gas scrubber 2, which is connected via a connecting line 6 with an electric dust collector 3. The electric dust collector 3 is designed as a wet electrostatic precipitator. The water management 10 supplies the system with the supply and discharge of the water or washing liquid.
Sowohl der Gaswäscher 2 als auch das Nass-Elektrofilter 3 arbeiten in bekannter Weise.Both the gas scrubber 2 and the wet electrostatic filter 3 operate in a known manner.
Im Gaswäscher 2 wird der zu reinigende Gasstrom mit einem Flüssigkeitsstrom in Kontakt gebracht, um Bestandteile des Gasstroms in der Flüssigkeit aufzunehmen. Bei den übergehenden Bestandteilen des Gasstromes kann es sich um feste, flüssige oder gasförmige Bestandteile handeln. Als Waschflüssigkeit können reine Lösungsmittel wie Wasser aber auch Suspensionen eingesetzt werden.In the gas scrubber 2, the gas stream to be cleaned is brought into contact with a liquid stream to receive components of the gas stream in the liquid. The passing components of the gas stream may be solid, liquid or gaseous constituents. As washing liquid pure solvents such as water but also suspensions can be used.
Eine beispielhafte Ausführung:An exemplary embodiment:
Der Gaswäscher hat häufig sechs Bereiche: Im Sumpf des Gaswäschers sammelt sich die Waschflüssigkeit und wird abgezogen, im Gaszulauf wird das Gas aufgegeben und durch Einbauten eine gleichmässige Belastung des Innenraumes erreicht, in der Kontaktstrecke findet das Auswaschen der sich im Gasstrom befindenden Bestandteile statt, in der Waschflüssigkeitsaufgabe wird die Waschflüssigkeit aufgegeben und verteilt, im Tropfenfänger werden mitgerisse- ne Bestandteile der Waschflüssigkeit abgeschieden und im Auslassbereich ver- lässt der gereinigte Gasstrom den Gaswäscher.The gas scrubber often has six areas: In the bottom of the gas scrubber, the scrubbing liquid is collected and withdrawn in the gas inlet, the gas is given and installed by a uniform load on the interior, in the contact section, the leaching of the gas stream in the constituents takes place in the washing liquid is added to the washing liquid and distributed, are entrained in the drip ne components of the washing liquid deposited and leaving the purified gas stream in the outlet, the gas scrubber.
Die Waschflüssigkeit wird mit hoher Geschwindigkeit und in kleinen Tropfen durch das Gas gesprüht. Das Gas muss durch die Waschflüssigkeit wie durch einen Vorhang hindurch treten. Sind die Tropfen der Waschflüssigkeit schnell genug, so können die Partikel im Gasstrom nicht mehr den Tropfen ausweichen und verschmelzen mit ihnen zu grosseren Tropfen. Diese grosseren Tropfen können anschliessend mit dem Tropfenfänger abgeschieden werden.The scrubbing liquid is sprayed through the gas at high speed and in small drops. The gas must pass through the scrubbing liquid like through a curtain. If the drops of the washing liquid are fast enough, the particles in the gas stream can no longer escape the drop and fuse with them to larger drops. These larger drops can then be separated with the drip.
Der sonst bei Trocken-Elektrofiltern notwendige Konditionierturm entfällt. Zudem kann der Elektro-Staubabscheider 3 relativ klein ausgeführt werden.The conditioning tower otherwise required for dry electrostatic precipitators is eliminated. In addition, the electric dust collector 3 can be made relatively small.
Das Nass-Elektrofilter 3 ist gleichermassen eine Anlage zur Abscheidung von Partikeln aus Gasen, die auf dem elektrostatischen Prinzip beruht. Die Ab- Scheidung im Elektrofilter erfolgt zumeist in fünf Phasen: Zunächst erfolgt die Erzeugung der elektrischen Ladungen, dann findet die Aufladung der Staubpartikel im elektrischen Feld statt. Anschliessend erfolgt der Transport der geladenen Staubteilchen zu der Niederschlagselektrode. Die Staubpartikel haften daraufhin an der Niederschlagselektrode an. Schliesslich erfolgt die Abreinigung der Staubschicht von den Elektroden durch die Waschflüssigkeit.The wet electrostatic precipitator 3 is equally a plant for the separation of particles from gases, which is based on the electrostatic principle. The separation in the electrostatic precipitator usually takes place in five phases: First, the generation of the electrical charges takes place, then the charging of the dust particles takes place in the electric field. Subsequently, the transport of the charged dust particles to the collecting electrode takes place. The dust particles then adhere to the collecting electrode. Finally, the cleaning of the dust layer from the electrodes is carried out by the washing liquid.
Der Nass-Elektrofilter kann deutlich kleiner ausgeführt werden, als dies der Fall wäre, wenn auf den vorgeschalteten Gaswäscher 2 verzichtet würde. Ferner wird der Verschleiss der Elektroden durch die abrasiven Stäube dadurch reduziert, dass schon vorgereinigtes Gas eingeleitet wird.The wet electrostatic filter can be made significantly smaller than would be the case if the upstream scrubber 2 were dispensed with. Furthermore, the wear of the electrodes is reduced by the abrasive dusts in that already precleaned gas is introduced.
Ein weiterer Vorteil des vorgeschlagenen Systems bei Anlagen, die im Batch- Betrieb gefahren werden - z.B. ein Konverterstahlwerk, liegt darin, dass während der Prozessphase, in der heisses staubbeladenes Rauchgas entsteht, die Waschflüssigkeit für den Gaswäscher genutzt wird. In der Phase, in der kein Rauchgas entsteht, kann die zur Verfügung stehende Waschflüssigkeit zur Ab- reinigung der Elektroden ins Nass-Elektrofilter umgeleitet werden.Another advantage of the proposed system in plants that are operated in batch mode - for example, a converter steelworks, is that during the process phase, in which hot dust-laden flue gas is produced, the Washing liquid is used for the gas scrubber. In the phase in which no flue gas is produced, the available washing liquid can be diverted into the wet electrostatic precipitator to clean the electrodes.
Hinter dem Nass-Elektrofilter 3 wird der nunmehr gereinigte Gasstrom über eine Verbindungsleitung 8 in einen Kamin 4 geleitet, an dessen oberen Ende eine Abfackeleinrichtung 7 angeordnet ist. Vor der Abfackeleinrichtung kann eine Gas-Umschaltstation installiert sein, die - je nach Prozessphase -Prozessgase mit chemischem Heizwert in einen Gasbehälter umleitet. Der Transport des Gases wird von einem Gebläse 9 bewerkstelligt, das in die Leitung 8 integriert ist. Wird eine Gasrückgewinnung angestrebt, ist zwischen dem Gebläse 9 und dem Kamin 4 eine Umschaltstation angeordnet.Behind the wet electrostatic precipitator 3, the now purified gas stream is conducted via a connecting line 8 into a chimney 4, at the upper end of which a flaring device 7 is arranged. In front of the flaring device, a gas switching station can be installed, which - depending on the process phase - diverts process gases with a chemical calorific value into a gas container. The transport of the gas is accomplished by a blower 9, which is integrated into the conduit 8. If gas recovery is desired, a switching station is arranged between the fan 9 and the chimney 4.
Die vorgeschlagene Hydro-Hybrid-Filteranlage ist also eine weiterentwickelte Entstaubungstechnologie. The proposed hydro-hybrid filter system is therefore an advanced dedusting technology.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
(1 ) metallurgische Anlage (metallurgisches Gefäss)(1) metallurgical plant (metallurgical vessel)
(2) Gaswäscher (3) Elektro-Staubabscheider(2) Gas Scrubber (3) Electric Dust Collector
(4) Kamin(4) fireplace
(5) Verbindungsleitung (Kühlkamin)(5) Connecting pipe (cooling chimney)
(6) Verbindungsleitung(6) Connecting line
(7) Kamin; Abfackelvorrichtung falls technisch erforderlich (8) Verbindungsleitung(7) fireplace; Flaring device if technically required (8) Connecting cable
(9) Gebläse(9) Blower
(10) Wasserwirtschaft (10) Water management

Claims

Patentansprüche:claims:
1 ) Verfahren zur Reinigung, insbesondere Entstaubung, eines Rauchgases einer metallurgischen Anlage (1), das die Schritte aufweist: a) Einleiten des Rauchgases in einen Gaswäscher (2), wobei der Rauch- gasstrom im Gaswäscher (2) mit einer Flüssigkeit, insbesondere mit1) A method for cleaning, in particular dedusting, a flue gas of a metallurgical plant (1), comprising the steps of: a) introducing the flue gas into a gas scrubber (2), wherein the flue gas stream in the gas scrubber (2) with a liquid, in particular With
Wasser, in Kontakt gebracht wird, um Partikel aus dem Rauchgas in die Flüssigkeit zu überführen, und b) Zuleiten des im Gaswäscher (2) vorgereinigten Rauchgases in einen E- lektro-Staubabscheider (3), wobei der Rauchgasstrom im Nass- Elektrofilter (3) weiter von Partikeln aus dem Rauchgas befreit wird.Water, is brought into contact to transfer particles from the flue gas into the liquid, and b) feeding the gas scrubber (2) pre-cleaned flue gas in a E- lektro-Staubabscheider (3), wherein the flue gas stream in the wet electrostatic precipitator (3 ) is further freed of particles from the flue gas.
2) Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Rauchgas vom Gaswäscher (2) unmittelbar in den Elektro-Staubabscheider (3) geleitet wird.2) Method according to claim 1, characterized in that the flue gas from the scrubber (2) is passed directly into the electric dust collector (3).
3) Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Rauchgas auf seinem Weg von der metallurgischen Anlage (1 ) zum Gaswäscher (2) gekühlt wird.3) Method according to claim 1 or 2, characterized in that the flue gas is cooled on its way from the metallurgical plant (1) to the gas scrubber (2).
4) Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Rauchgas hinter dem Elektro-Staubabscheider (3) in einen Kamin (4) geleitet und in diesem abgefackelt wird. Auch die Gewinnung von Pro- zessgas mit chemischem Heizwert (z.B. CO) ist möglich (z.B. LT-4) Method according to one of claims 1 to 3, characterized in that the flue gas is passed behind the electric dust collector (3) in a chimney (4) and flared in this. The recovery of process gas with a chemical calorific value (for example CO) is also possible (for example LT-
Stahlgasverfahren)Steel Gas process)
5) Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Rauchgas im Gaswäscher (2) gekühlt wird.5) Method according to one of claims 1 to 4, characterized in that the flue gas in the gas scrubber (2) is cooled.
6) Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Kühlung des Rauchgases im Gaswäscher (2) bis auf Sättigungstemperatur erfolgt.6) Method according to claim 5, characterized in that the cooling of the flue gas in the gas scrubber (2) takes place up to saturation temperature.
7) Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Rauchgas im Gaswäscher (2) so gereinigt wird, dass es diesen mit einer Staubmenge vorzugsweise unter 1 ,0 g/Nm3 verlässt. 8) Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Elektro-Staubabscheider (3) mindestens eine Niederschlagselektrode aufweist, wobei die Reinigung der mindestens einen Niederschlagselektrode durch Spülung mit einer Flüssigkeit, insbesondere mit Wasser, erfolgt. 9) Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die schmelzmetallurgische Anlage (1 ) ein Konverter, ein Hochofen oder ein Elektroofen ist.7) Method according to one of claims 1 to 6, characterized in that the flue gas in the gas scrubber (2) is cleaned so that it leaves with a dust amount preferably below 1, 0 g / Nm3. 8) Method according to one of claims 1 to 7, characterized in that the electric dust collector (3) has at least one collecting electrode, wherein the cleaning of the at least one collecting electrode by flushing with a liquid, in particular with water, takes place. 9) Method according to one of claims 1 to 8, characterized in that the melt-metallurgical plant (1) is a converter, a blast furnace or an electric furnace.
10)Rauchgasreinigungsvorrichtung einer metallurgischen Anlage (1 ), insbesondere zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 10, die aufweist: a) einen über eine Verbindungsleitung (5) mit der metallurgischen Anlage (1 ) verbundenen Gaswäscher (2) und b) einen über eine weitere Verbindungsleitung (6) mit dem Gaswäscher (2) verbundenen Elektro-Staubabscheider (3). 11 )Rauchgasreinigungsvorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Verbindungsleitung (5) zwischen der metallurgischen Anlage (1) und dem Gaswäscher (2) zumindest abschnittsweise als Kühlkamin ausgebildet ist. 12)Rauchgasreinigungsvorrichtung nach Anspruch 11 , dadurch gekennzeich- net, dass hinter dem Elektro-Staubabscheider (3) ein Kamin (4) mit oder ohne eine Abfackeleinrichtung (7) angeordnet ist.10) flue gas purification device of a metallurgical plant (1), in particular for carrying out the method according to one of claims 1 to 10, which comprises: a) a via a connecting line (5) with the metallurgical plant (1) connected gas scrubber (2) and b) a via a further connecting line (6) with the gas scrubber (2) connected to the electric dust collector (3). 11) flue gas cleaning device according to claim 10, characterized in that the connecting line (5) between the metallurgical plant (1) and the gas scrubber (2) is at least partially formed as a cooling chimney. 12) flue gas cleaning device according to claim 11, characterized marked, that behind the electric dust collector (3) a chimney (4) with or without a flaring device (7) is arranged.
13)Rauchgasreinigungsvorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass in einer Verbindungsleitung (8) zwischen dem Elektro- Staubabscheider (3) und dem Kamin (4) ein Gebläse (9) angeordnet ist. 14)Rauchgasreinigungsvorrichtung nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, dass die schmelzmetallurgische Anlage (1) ein Konverter, ein Hochofen oder ein Elektroofen ist. 13) flue gas cleaning device according to claim 12, characterized in that in a connecting line (8) between the electric dust collector (3) and the chimney (4) a fan (9) is arranged. 14) flue gas cleaning device according to one of claims 11 to 13, characterized in that the melt-metallurgical plant (1) is a converter, a blast furnace or an electric furnace.
EP09744067A 2008-10-20 2009-10-19 Method for scrubbing a flue gas of a metallurgical plant and flue gas scrubbing apparatus Ceased EP2352575A1 (en)

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