EP2352575A1 - Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées - Google Patents

Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées

Info

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)
English (en)
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/fr
Ceased legal-status Critical Current

Links

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.

Landscapes

  • 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

L'invention porte sur un procédé de purification, en particulier de dépoussiérage, d'un gaz de fumée d'une installation métallurgique (1), qui comprend les étapes de : a) introduction d'un gaz de fumée dans un laveur de gaz (2), le courant du gaz de fumée étant, dans le laveur de gaz (2), mis en contact avec un liquide, en particulier avec de l'eau, pour transférer les particules du gaz de fumée dans le liquide, et b) amenée du gaz de fumée, pré-purifié dans le laveur de gaz (2), dans un électrofiltre (3) par voie humide, le courant de gaz de fumée étant, dans un séparateur de poussière électrostatique (3), débarrassé encore plus des poussières se trouvant dans le gaz de fumée. On peut ainsi réaliser une filtration avantageuse du point de vue énergétique et efficace de particules se trouvant dans le gaz de fumée. En outre, l'invention porte sur un dispositif de purification d'un gaz de fumée.
EP09744067A 2008-10-20 2009-10-19 Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées Ceased EP2352575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008052119 2008-10-20
PCT/EP2009/007482 WO2010046071A1 (fr) 2008-10-20 2009-10-19 Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées

Publications (1)

Publication Number Publication Date
EP2352575A1 true EP2352575A1 (fr) 2011-08-10

Family

ID=41396006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09744067A Ceased EP2352575A1 (fr) 2008-10-20 2009-10-19 Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées

Country Status (4)

Country Link
EP (1) EP2352575A1 (fr)
CN (1) CN102202768A (fr)
TW (1) TW201020020A (fr)
WO (1) WO2010046071A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102580437A (zh) * 2012-02-21 2012-07-18 中冶华天工程技术有限公司 转炉一次烟气双塔净化方法及转炉一次烟气净化塔
CN103571984A (zh) * 2012-08-01 2014-02-12 马西元 一种用原煤冶炼铁的方法
DE102012224521A1 (de) 2012-12-28 2014-07-03 Sms Siemag Ag Vorrichtung und Verfahren zum Reinigen von Rauchgas einer metallurgischen Anlage
DE102012224523A1 (de) 2012-12-28 2014-07-03 Sms Siemag Ag Vorrichtung und Verfahren zum Reinigen von Rauchgas einer metallurgischen Anlage
CN104075335B (zh) * 2014-07-22 2017-01-11 山东神华山大能源环境有限公司 一种利用耦合技术实现锅炉烟气达标排放的工艺及其装置
DE102014223917A1 (de) 2014-11-25 2016-05-25 Sms Group Gmbh Vorrichtung und Verfahren zum Reinigen von Rauchgas einer metallurgischen Anlage
KR101984814B1 (ko) * 2017-08-31 2019-05-31 주식회사 에코에너젠 Ipa를 포함하는 공정 배기 스트림의 처리 시스템
AT16120U1 (de) * 2018-01-19 2019-02-15 Scheuch Gmbh Vorrichtung zur Reinigung von mit Staub und organischen als auch anorganischen Verbindungen belasteten Abgasen aus der holzverarbeitenden Industrie
CN108837646A (zh) * 2018-04-09 2018-11-20 张素平 一种空气净化装置
CN108295588A (zh) * 2018-04-10 2018-07-20 北京英华高科技有限公司 一种新型气体除尘净化设备
CN109331601B (zh) * 2018-12-04 2023-11-28 昊姆（上海）节能科技有限公司 热湿烟气脱白除尘装置及利用其的脱白除尘方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820768A (en) * 1971-07-19 1974-06-28 Pennsylvania Engineering Corp Steel conversion method and apparatus
US5980606A (en) * 1996-03-22 1999-11-09 Steel Technology Corporation Method for reducing sulfuric content in the offgas of an iron smelting process

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004130213A (ja) * 2002-10-10 2004-04-30 Chiyoda Corp 排ガス処理装置
JP2004238236A (ja) * 2003-02-05 2004-08-26 Nippon Electric Glass Co Ltd ガラス溶融方法およびガラス溶融設備
JP3937356B1 (ja) * 2006-03-29 2007-06-27 株式会社日立プラントテクノロジー 排ガス処理方法および設備
KR100817303B1 (ko) * 2006-11-07 2008-03-27 (주)플라즈마텍 혼산 배기 가스 처리 장치 및 방법
JP2008202071A (ja) * 2007-02-19 2008-09-04 Nippon Steel Engineering Co Ltd 高炉ガス清浄設備の操業方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820768A (en) * 1971-07-19 1974-06-28 Pennsylvania Engineering Corp Steel conversion method and apparatus
US5980606A (en) * 1996-03-22 1999-11-09 Steel Technology Corporation Method for reducing sulfuric content in the offgas of an iron smelting process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2010046071A1 *

Also Published As

Publication number Publication date
WO2010046071A1 (fr) 2010-04-29
TW201020020A (en) 2010-06-01
CN102202768A (zh) 2011-09-28

Similar Documents

Publication Publication Date Title
EP2352575A1 (fr) Procédé de purification d'un gaz de fumée d'une installation métallurgique, et dispositif de purification des fumées
AT511613B1 (de) Verfahren und anlage zur abgasreinigung bei vakuum-stahlbehandlungsprozessen
DE4240196C2 (de) Verfahren zur Kühlung und Reinigung von ultrafeine Partikel enthaltendem Gas, insbesondere Gichtgas oder Generatorgas und Vorrichtung zu seiner Durchführung
EP2749341B1 (fr) Dispositif et procédé de nettoyage de gaz de fumée d'une installation métallurgique
EP0143395A1 (fr) Procédé et installation pour brûler des matériaux en grains fins pour la production des clinkers de ciment
EP0748647A1 (fr) Procédé et dispositif pour réduire la teneur en poussière d'un gaz provenant de la combustion d'un générateur de vapeur
CH638107A5 (de) Vorrichtung und verfahren zum absorbieren von verunreinigungen in abgasen.
DE3703706C2 (de) Verfahren und Anordnung zum Reinigen eines kontaminierten Heissgasstromes
DE4233685C2 (de) Verfahren und Anordnung zur Energienutzung von Rauchgasen in kohlegefeuerten Kraftwerken
DE521697C (de) Verfahren und Einrichtung zum Reinigen von Gasen
CN207520858U (zh) 一种岩棉生产过程中废气综合处理系统
DE911013C (de) Nassbetribener Mehrfach-Fliehkraft-Staubabscheider und Verfahren zum Betrieb eines solchen
DE3325140A1 (de) Verfahren zur reinigung von staub- und aerosolhaltigen gasen und/oder daempfen sowie anlage zur durchfuehrung des verfahrens
DE102012224523A1 (de) Vorrichtung und Verfahren zum Reinigen von Rauchgas einer metallurgischen Anlage
EP3025785B1 (fr) Dispositif et procédé de nettoyage de gaz de fumée d'une installation métallurgique
DD275725A1 (de) Verfahren und anlage zur rauchgasentschwefelung
EP2563940B1 (fr) Procédé de fabrication de fonte brute ou de produits d'acier semi-finis liquides
DE3433707C2 (fr)
AT393631B (de) Verfahren und einrichtung zur abscheidung von schadstoffen
DE4018488C1 (en) Removing dust and hazardous materials from waste gases - by sepg. dust in dry multi-cyclone stage, and wet electrostatic precipitator stage
DE4229736C1 (de) Verfahren zum Betrieb einer Rauchgasentschwefelungsanlage und Anlage für die Durchführung des Verfahrens
DE2625304C3 (de) Verfahren und Anlage zur Rauchgasreinigung an metallurgischen öfen u.dgl
EP0013299B1 (fr) Procédé et dispositif pour le traitement de fumées
AT509735B1 (de) Verfahren und vorrichtung zur herstellung von zumindest teilweise reduzierten metallerzen und/oder metallen
DE2166912A1 (de) Verfahren und anlage zur verbesserung des filtereffektes an filterflaechen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110415

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20130107

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20150203