WO2011141827A1 - Procédé et équipement de dépoussiérage d'un flux de gaz chargés de poussière dans une installation à filtre hybride - Google Patents

Procédé et équipement de dépoussiérage d'un flux de gaz chargés de poussière dans une installation à filtre hybride Download PDF

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Publication number
WO2011141827A1
WO2011141827A1 PCT/IB2011/051146 IB2011051146W WO2011141827A1 WO 2011141827 A1 WO2011141827 A1 WO 2011141827A1 IB 2011051146 W IB2011051146 W IB 2011051146W WO 2011141827 A1 WO2011141827 A1 WO 2011141827A1
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WO
WIPO (PCT)
Prior art keywords
dust
laden gases
esp
ducts
high voltage
Prior art date
Application number
PCT/IB2011/051146
Other languages
English (en)
Inventor
Henrik Vittrup Pedersen
Karsten Poulsen
Original Assignee
Flsmidth A/S
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 Flsmidth A/S filed Critical Flsmidth A/S
Publication of WO2011141827A1 publication Critical patent/WO2011141827A1/fr

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    • 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
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • 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
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • 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
    • B03C3/36—Controlling flow of gases or vapour
    • B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
    • B03C3/365—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located after the filter
    • 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
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • 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
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/04—Ionising electrode being a wire

Definitions

  • the present invention relates to a method for dedusting a stream of dust-laden gases in a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) having ducts provided with grounded collecting plates and high voltage electrodes and a fabric filter (FF).
  • ESP electrostatic precipitator
  • FF fabric filter
  • Hybrid filter installations of the aforementioned kind are well known and widely used within e.g. the cement manufacturing industry.
  • the average cleaning efficiency of a normal working ESP is about 99.9 % and the dust leaving the ESP suspended in the gases is mono-modal and constitutes the finest fraction of the dust which entered the ESP with the gases.
  • the dense dust cake on the FF requires a high cleaning frequency and thus high compressed air consumption and a relatively short life of the filter media used in the FF. Further, it may also leads to a relatively high dust emission from the plant.
  • this is achieved by a method of the kind mentioned in the introduction, and being characterized in that a part of the stream of dust-laden gases are bypassed the ducts in the ESP provided with grounded collecting plates and high voltage electrodes, and in that the bypassed dust-laden gases are mixed with dust-laden gases which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes before the mixed dust-laden gases are conducted to the FF.
  • the dust in the dust-laden gases conducted to the FF is coarser, causing the filter cake on the FF to be of higher permeability, thus decreasing the pressure loss over the filter media in the FF, improving the filter media life time and reducing the use of compressed air for cleaning. Further, a lower dust emission from the plant is obtained. This is due to the fact that a considerable agglomeration of the dust particles takes place when the bypassed uncharged dust-laden gases and the charged dust-laden gases, which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes, are mixed, thus resulting in an overall coarser particle size distribution prior to settling on the FF filter media.
  • the plant for carrying out the method according to the invention comprises a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) having ducts provided with grounded collecting plates and high voltage electrodes and a fabric filter (FF), and is characterized in that it comprises means for bypassing a part of the stream of dust-laden gases the ducts in the ESP provided with grounded collecting plates and high voltage electrodes, a mixing zone for mixing the bypassed dust-laden gases with dust-laden gases which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes before the mixed dust-laden gases are conducted to the FF.
  • ESP electrostatic precipitator
  • FF fabric filter
  • the means for bypassing a part of the stream of dust-laden gases the ducts in the ESP provided with grounded collecting plates and high voltage electrodes may be a duct connecting an inlet duct to the ESP with outlet end of the ESP thus enabling a part of the dust-laden gases to be bypassed the ESP.
  • Such bypass duct may preferable be provided with means for regulating the gas flow through it.
  • the bypassing means may also be ducts within the ESP itself, and may preferably be provided in between the ducts provided with grounded collecting plates and high voltages electrodes. In the latter embodiment a better mixing ensuring bipolar agglomeration is obtained.
  • the mixing zone may comprise mixing screens of the kind already marketed by the applicant of the present patent application.
  • the invention is applicable for filter installations where the ESP and the FF are fitted within the same casing as well as where they are fitted within each their separate casing.
  • Fig. 1 shows an embodiment of a hybrid filter installation according to the invention.
  • Fig. 1 a hybrid filter installation for dedusting a stream of dust-laden gases and comprising an ESP 1 having an inlet duct 7 for gases to be dedusted, ducts 2 defined by grounded collecting plates 6 and provided with high voltage electrodes 3 and a FF 4 in form of a bag filter having bags 5.
  • a stream of dust-laden gases to be dedusted are first introduced through the inlet duct 7 to the ESP 1, wherein the gases in traditional way are dedusted by being electrically charged by high voltages electrodes 3 provided in ducts 2 and collected by collecting plates 6, which are frequently cleaned by rapping means, not shown.
  • the dust-laden gases are conducted to the FF 4, which as shown, may be a bag filter, wherein the gases are drawn through the bags 5 by means of a fan, not shown, while the dust settles on the outer side of the bags 5, thus creating a filter cake, which frequently is cleaned off by back flushing or compressed air pulsing.
  • a part of the stream of dust-laden gases are bypassed the ducts 2 in the ESP 1 provided with grounded collecting plates 6 and high voltage electrodes 3 through ducts 8 within the ESP 1 itself, which ducts 8 are provided in between the ducts 2 provided with grounded collecting plates 6 and high voltages electrodes 3.
  • the mixing zone 9 may comprise mixing screens 10 of the kind already marketed by the applicant of the present patent application.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

La présente invention se rapporte à un procédé ainsi qu'à un équipement de dépoussiérage d'un flux de gaz chargés de poussière dans une installation à filtre hybride. Les gaz chargés de poussière sont dépoussiérés dans un précipitateur électrostatique (ESP) (1) comportant des conduits (2) pourvus de plaques de collecte mises à la terre (6) et d'électrodes haute-tension (3) et un filtre en tissu (FF) (4). Le procédé et l'équipement sont particuliers en ce qu'une partie du flux de gaz chargés de poussière contourne les conduits (2) de l'ESP (1) pourvu de plaques de collecte mises à la terre (6) et d'électrodes haute-tension (3), et en ce que les gaz chargés de poussière détournés sont mélangés aux gaz chargés de poussière qui sont passés par les conduits (2) de l'ESP (1) pourvu des plaques de collecte mises à la terre (6) et d'électrodes haute-tension (3) avant que les gaz chargés de poussière mélangés soient menés jusqu'au FF (4).
PCT/IB2011/051146 2010-05-11 2011-03-18 Procédé et équipement de dépoussiérage d'un flux de gaz chargés de poussière dans une installation à filtre hybride WO2011141827A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201000417 2010-05-11
DKPA201000417 2010-05-11

Publications (1)

Publication Number Publication Date
WO2011141827A1 true WO2011141827A1 (fr) 2011-11-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/051146 WO2011141827A1 (fr) 2010-05-11 2011-03-18 Procédé et équipement de dépoussiérage d'un flux de gaz chargés de poussière dans une installation à filtre hybride

Country Status (1)

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WO (1) WO2011141827A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103908862A (zh) * 2014-04-03 2014-07-09 江苏天洁环境工程有限公司 一种叠加式电袋复合除尘器
ITUB20161246A1 (it) * 2016-03-02 2017-09-02 Ecospray Tech Srl Apparato filtrante ad efficienza migliorata e processo per la depolverazione di gas

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE362539A (fr) *
US5217511A (en) * 1992-01-24 1993-06-08 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Enhancement of electrostatic precipitation with electrostatically augmented fabric filtration
JPH09972A (ja) * 1995-06-16 1997-01-07 Hitachi Ltd オゾン脱臭集塵機
EP1125622A2 (fr) * 2000-02-14 2001-08-22 Dart Industries Inc. Système de filtration d'air
EP1434012A2 (fr) * 2002-12-23 2004-06-30 Samsung Electronics Co., Ltd. Purificateur d'air
WO2006101070A1 (fr) * 2005-03-24 2006-09-28 Isuzu Motors Limited Dispositif et méthode de traitement des gaz d'évacuation
EP1837489A1 (fr) * 2004-12-17 2007-09-26 FURUGEN, Munekatsu Moyen de traitement electrique pour gaz d'echappement de moteur diesel et son dispositif

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE362539A (fr) *
US5217511A (en) * 1992-01-24 1993-06-08 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Enhancement of electrostatic precipitation with electrostatically augmented fabric filtration
JPH09972A (ja) * 1995-06-16 1997-01-07 Hitachi Ltd オゾン脱臭集塵機
EP1125622A2 (fr) * 2000-02-14 2001-08-22 Dart Industries Inc. Système de filtration d'air
EP1434012A2 (fr) * 2002-12-23 2004-06-30 Samsung Electronics Co., Ltd. Purificateur d'air
EP1837489A1 (fr) * 2004-12-17 2007-09-26 FURUGEN, Munekatsu Moyen de traitement electrique pour gaz d'echappement de moteur diesel et son dispositif
WO2006101070A1 (fr) * 2005-03-24 2006-09-28 Isuzu Motors Limited Dispositif et méthode de traitement des gaz d'évacuation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103908862A (zh) * 2014-04-03 2014-07-09 江苏天洁环境工程有限公司 一种叠加式电袋复合除尘器
ITUB20161246A1 (it) * 2016-03-02 2017-09-02 Ecospray Tech Srl Apparato filtrante ad efficienza migliorata e processo per la depolverazione di gas
WO2017149489A1 (fr) * 2016-03-02 2017-09-08 Ecospray Technologies S.R.L. Appareil et procédé de filtre de dépoussiérage de gaz
CN108883421A (zh) * 2016-03-02 2018-11-23 埃科斯普雷技术有限公司 气体除尘过滤设备和方法
CN108883421B (zh) * 2016-03-02 2020-08-18 埃科斯普雷技术有限公司 气体除尘过滤设备和方法
US11117139B2 (en) 2016-03-02 2021-09-14 Ecospray Technologies S.R.L. Gas dedusting filter apparatus and process

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