FI118152B - Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta - Google Patents

Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta Download PDF

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Publication number
FI118152B
FI118152B FI990484A FI990484A FI118152B FI 118152 B FI118152 B FI 118152B FI 990484 A FI990484 A FI 990484A FI 990484 A FI990484 A FI 990484A FI 118152 B FI118152 B FI 118152B
Authority
FI
Finland
Prior art keywords
ion
voltage
collecting
electrically conductive
gas
Prior art date
Application number
FI990484A
Other languages
English (en)
Finnish (fi)
Swedish (sv)
Other versions
FI990484A0 (fi
FI990484L (fi
Inventor
Veikko Ilmari Ilmasti
Original Assignee
Veikko Ilmari Ilmasti
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 Veikko Ilmari Ilmasti filed Critical Veikko Ilmari Ilmasti
Publication of FI990484A0 publication Critical patent/FI990484A0/fi
Priority to FI990484A priority Critical patent/FI118152B/fi
Priority to HK02105074.6A priority patent/HK1043335B/xx
Priority to JP2000603807A priority patent/JP4897142B2/ja
Priority to AU31680/00A priority patent/AU773687B2/en
Priority to EEP200100463A priority patent/EE200100463A/xx
Priority to DE60043218T priority patent/DE60043218D1/de
Priority to EP00909376A priority patent/EP1165241B1/en
Priority to CA002362721A priority patent/CA2362721C/en
Priority to RU2001124328/12A priority patent/RU2235601C2/ru
Priority to TR2001/02534T priority patent/TR200102534T2/xx
Priority to CNB00804600XA priority patent/CN1172753C/zh
Priority to US09/914,730 priority patent/US6632267B1/en
Priority to KR1020017011298A priority patent/KR100710697B1/ko
Priority to BRPI0008762-9A priority patent/BR0008762B1/pt
Priority to ES00909376T priority patent/ES2337979T3/es
Priority to UA2001096119A priority patent/UA72499C2/uk
Priority to PL350430A priority patent/PL199884B1/pl
Priority to DK00909376.6T priority patent/DK1165241T3/da
Priority to PCT/FI2000/000168 priority patent/WO2000053325A1/en
Priority to AT00909376T priority patent/ATE446807T1/de
Priority to SK1239-2001A priority patent/SK12392001A3/sk
Priority to HU0200199A priority patent/HU229018B1/hu
Priority to PT00909376T priority patent/PT1165241E/pt
Priority to CZ20013122A priority patent/CZ301801B6/cs
Publication of FI990484L publication Critical patent/FI990484L/fi
Priority to ZA200107068A priority patent/ZA200107068B/xx
Priority to NO20014196A priority patent/NO328514B1/no
Application granted granted Critical
Publication of FI118152B publication Critical patent/FI118152B/fi
Priority to CY20101100085T priority patent/CY1110286T1/el

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02Plant or installations having external electricity supply
    • B03C3/16Plant or installations having external electricity supply wet type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/40Electrode constructions
    • B03C3/41Ionising-electrodes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/66Applications of electricity supply techniques
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/74Cleaning the electrodes
    • B03C3/78Cleaning the electrodes by washing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00Details of magnetic or electrostatic separation
    • B03C2201/10Ionising electrode with two or more serrated ends or sides
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/38Tubular collector electrode

Landscapes

  • Electrostatic Separation (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Combined Means For Separation Of Solids (AREA)
FI990484A 1999-03-05 1999-03-05 Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta FI118152B (fi)

Priority Applications (27)

Application Number Priority Date Filing Date Title
FI990484A FI118152B (fi) 1999-03-05 1999-03-05 Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta
ES00909376T ES2337979T3 (es) 1999-03-05 2000-03-03 Procedimiento y proceso para separar materiales en forma de particulas y/o gotas de un flujo de gas.
UA2001096119A UA72499C2 (uk) 1999-03-05 2000-03-03 Спосіб та пристрій для виділення матеріалів в формі часток та/або капель з газового потоку
AU31680/00A AU773687B2 (en) 1999-03-05 2000-03-03 Method and process for separating materials in the form of particles and/or drops from a gas flow
EEP200100463A EE200100463A (et) 1999-03-05 2000-03-03 Meetod ja seades osakeste ja/või tilkade kujul olevate ainete eraldamiseks gaasivoost
DE60043218T DE60043218D1 (de) 1999-03-05 2000-03-03 Verfahren und gerät für trennung von teilchen und/oder tröpfhen aus gasfluss
EP00909376A EP1165241B1 (en) 1999-03-05 2000-03-03 Method and process for separating materials in the form of particles and/or drops from a gas flow
CA002362721A CA2362721C (en) 1999-03-05 2000-03-03 Method and process for separating materials in the form of particles and/or drops from a gas
RU2001124328/12A RU2235601C2 (ru) 1999-03-05 2000-03-03 Способ и устройство для отделения частиц и/или капель материала от потока газа
TR2001/02534T TR200102534T2 (tr) 1999-03-05 2000-03-03 Zerre ve/veya damla şeklindeki cisimlerin bir gaz akışından ayrılması için bir yöntem ve işlem.
CNB00804600XA CN1172753C (zh) 1999-03-05 2000-03-03 用于从气流中分离微粒和/或液滴状物质的方法和装置
US09/914,730 US6632267B1 (en) 1999-03-05 2000-03-03 Method and device for separating materials in the form of particles and/or drops from a gas flow
KR1020017011298A KR100710697B1 (ko) 1999-03-05 2000-03-03 가스 흐름으로부터 입자 및/또는 소적 형태의 물질을분리시키는 방법 및 장치
BRPI0008762-9A BR0008762B1 (pt) 1999-03-05 2000-03-03 Método e dispositivo para a separaçao materiais na forma de partículas e/ou gotas de um fluxo de gás
HK02105074.6A HK1043335B (en) 1999-03-05 2000-03-03 Method and device for separating materials in the form of particles and/or drops from a gas flow
DK00909376.6T DK1165241T3 (da) 1999-03-05 2000-03-03 Fremgangsmåde og indretning til separation af materialer i form af partikler og/eller dråber fra en gasstrøm
SK1239-2001A SK12392001A3 (sk) 1999-03-05 2000-03-03 Spôsob oddeľovania látok v tvare častíc a/alebo kvapiek z prúdu plynu
PL350430A PL199884B1 (pl) 1999-03-05 2000-03-03 Sposób i urządzenie do oddzielania cząstek stałych i/lub ciekłych ze strumienia gazu
PCT/FI2000/000168 WO2000053325A1 (en) 1999-03-05 2000-03-03 Method and process for separating materials in the form of particles and/or drops from a gas flow
AT00909376T ATE446807T1 (de) 1999-03-05 2000-03-03 Verfahren und gerät für trennung von teilchen und/oder tröpfhen aus gasfluss
JP2000603807A JP4897142B2 (ja) 1999-03-05 2000-03-03 気体流から粒子および/または液滴形態の物質を分離する方法および装置
HU0200199A HU229018B1 (en) 1999-03-05 2000-03-03 Method and process for separating materials in the form of particles and/or drops from a gas flow
PT00909376T PT1165241E (pt) 1999-03-05 2000-03-03 Método e processos para separar materiais sob a forma de partículas e / ou gotas de um fluxo de gás
CZ20013122A CZ301801B6 (cs) 1999-03-05 2000-03-03 Zpusob oddelování látek v podobe cástic a/nebo kapek z proudu plynu a zarízení k provádení zpusobu
ZA200107068A ZA200107068B (en) 1999-03-05 2001-01-01 Method and process for separating materials in the form of particles and/or drops from gas flow.
NO20014196A NO328514B1 (no) 1999-03-05 2001-08-29 Fremgangsmate og anordning for separering av materialer i form av partikler og/eller draper fra en gasstrom
CY20101100085T CY1110286T1 (el) 1999-03-05 2010-01-28 Μεθοδος και διαδικασια για το διαχωρισμο υλικων σε μορφη σωματιδιων και/ή σταγονων απο μια ροη αεριου

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990484A FI118152B (fi) 1999-03-05 1999-03-05 Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta
FI990484 1999-03-05

Publications (3)

Publication Number Publication Date
FI990484A0 FI990484A0 (fi) 1999-03-05
FI990484L FI990484L (fi) 2000-09-06
FI118152B true FI118152B (fi) 2007-07-31

Family

ID=8554084

Family Applications (1)

Application Number Title Priority Date Filing Date
FI990484A FI118152B (fi) 1999-03-05 1999-03-05 Menetelmä ja laite hiukkas- ja/tai pisaramuodossa olevien materiaalien erottamiseksi kaasuvirtauksesta

Country Status (26)

Country Link
US (1) US6632267B1 (cs)
EP (1) EP1165241B1 (cs)
JP (1) JP4897142B2 (cs)
KR (1) KR100710697B1 (cs)
CN (1) CN1172753C (cs)
AT (1) ATE446807T1 (cs)
AU (1) AU773687B2 (cs)
BR (1) BR0008762B1 (cs)
CA (1) CA2362721C (cs)
CY (1) CY1110286T1 (cs)
CZ (1) CZ301801B6 (cs)
DE (1) DE60043218D1 (cs)
DK (1) DK1165241T3 (cs)
EE (1) EE200100463A (cs)
ES (1) ES2337979T3 (cs)
FI (1) FI118152B (cs)
HU (1) HU229018B1 (cs)
NO (1) NO328514B1 (cs)
PL (1) PL199884B1 (cs)
PT (1) PT1165241E (cs)
RU (1) RU2235601C2 (cs)
SK (1) SK12392001A3 (cs)
TR (1) TR200102534T2 (cs)
UA (1) UA72499C2 (cs)
WO (1) WO2000053325A1 (cs)
ZA (1) ZA200107068B (cs)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10244051C1 (de) * 2002-09-21 2003-11-20 Karlsruhe Forschzent Ionisator und seine Verwendung in einer Abgasreinigungsanlage für tropfenbeladene und/oder kondensierende Feuchtgase
DK1658901T3 (en) * 2003-08-29 2017-04-03 Mitsubishi Hitachi Power Systems Env Solutions Ltd DUST COLLECTOR
US20060174763A1 (en) * 2005-02-04 2006-08-10 Mainstream Engineering Corporation Self cleaning electrostatic air cleaning system
WO2006113749A1 (en) * 2005-04-19 2006-10-26 Ohio University Composite discharge electrode
DE202005010532U1 (de) * 2005-07-05 2006-11-16 Hengst Gmbh & Co.Kg Elektroabscheider mit auswechselbarer Niederschlagselektrode
DE102005045010B3 (de) * 2005-09-21 2006-11-16 Forschungszentrum Karlsruhe Gmbh Elektrostatische Ionisierungsstufe in einer Abscheidungseinrichtung
US7651553B2 (en) * 2005-09-29 2010-01-26 Sarnoff Corporation Ballast circuit for electrostatic particle collection systems
KR100787234B1 (ko) * 2006-02-17 2007-12-21 한국기계연구원 입자 분리 장치 및 입자 분리 방법
RU2320422C1 (ru) * 2006-08-02 2008-03-27 Федеральное государственное унитарное предприятие "Московское машиностроительное производственное предприятие "САЛЮТ" (ФГУП "ММПП "САЛЮТ") Способ отделения частиц и/или капель вещества микронного и субмикронного размера от потока газа
JP4873564B2 (ja) * 2007-03-29 2012-02-08 トヨタ自動車株式会社 排ガス浄化装置
TWI340665B (en) * 2008-06-18 2011-04-21 Ind Tech Res Inst Wet electrostatic precipitator with condensation-growth chamber
US8323386B2 (en) * 2009-10-16 2012-12-04 Midwest Research Institute, Inc. Apparatus and method for electrostatic particulate collector
US20110192284A1 (en) * 2010-02-09 2011-08-11 Ventiva, Inc. Spark resistant ion wind fan
EP3271077B1 (de) * 2015-03-19 2021-02-17 WOCO Industrietechnik GmbH Vorrichtung und verfahren zum abscheiden von verunreinigungen
CN106311543A (zh) * 2016-10-22 2017-01-11 钟贵洪 一种漆雾处理房
MX387456B (es) 2017-06-02 2025-03-18 Genano Oy Dispositivo y método para separar materiales.
US10518271B2 (en) 2017-06-02 2019-12-31 Genano Oy Device and method for separating materials
HUE056748T2 (hu) 2017-06-02 2022-03-28 Genano Oy Készülék és eljárás anyagok leválasztására
DE102017114638B4 (de) * 2017-06-30 2019-11-21 Das Environmental Expert Gmbh Elektrostatischer Abscheider und Verfahren zur elektrostatischen Abscheidung von Stoffen aus einem Abgasstrom
CN111473434A (zh) * 2020-04-15 2020-07-31 北京信和洁能新能源技术服务有限公司 一种杀灭空气中的病原微生物的消毒杀菌装置及消毒杀菌方法

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE368519C (de) * 1920-07-08 1923-02-06 Siemens Schuckertwerke G M B H Elektrische Niederschlagseinrichtung mit isolierten Elektroden
US1992113A (en) * 1931-10-26 1935-02-19 Int Precipitation Co Electrical precipitating apparatus
US3157479A (en) * 1962-03-26 1964-11-17 Arthur F Boles Electrostatic precipitating device
DE1974466U (de) * 1967-07-14 1967-12-07 Constantin Grafvon Berckheim Kraftfahrzeug mit deckenelektrode mit physikalischer beeinflussung der raumluft durch ein elektrisches gleichfeld.
DE2139824C2 (de) * 1971-08-09 1982-10-14 Hoechst Ag, 6000 Frankfurt Vorrichtung zur Durchführung eines Spannungszuführungsleiters durch den Deckel eines Elektroabscheiders
US3890103A (en) * 1971-08-25 1975-06-17 Jinemon Konishi Anti-pollution exhaust apparatus
JPS5119182B2 (cs) * 1971-08-25 1976-06-15
NL7303156A (cs) * 1973-03-06 1974-09-10
US4010011A (en) * 1975-04-30 1977-03-01 The United States Of America As Represented By The Secretary Of The Army Electro-inertial air cleaner
US4077782A (en) * 1976-10-06 1978-03-07 Maxwell Laboratories, Inc. Collector for electrostatic precipitator apparatus
US4233037A (en) * 1979-07-13 1980-11-11 The United States Of America As Represented By The Administrator U.S. Environmental Protection Agency Method of and apparatus for reducing back corona effects
US4477268A (en) * 1981-03-26 1984-10-16 Kalt Charles G Multi-layered electrostatic particle collector electrodes
US4585320A (en) * 1984-12-12 1986-04-29 Xerox Corporation Corona generating device
FI83481C (fi) * 1989-08-25 1993-10-25 Airtunnel Ltd Oy Foerfarande och anordning foer rengoering av luft, roekgaser eller motsvarande
US5084078A (en) * 1990-11-28 1992-01-28 Niles Parts Co., Ltd. Exhaust gas purifier unit
WO1997005955A1 (fr) * 1995-08-08 1997-02-20 Galaxy Yugen Kaisha Dispositif de precipitation electrostatique
JPH1047037A (ja) * 1996-07-29 1998-02-17 Teikoku Piston Ring Co Ltd 微粒子分離装置
JP2887163B2 (ja) * 1996-10-07 1999-04-26 ギャラクシー有限会社 電気集塵装置および焼却炉
DE19751984A1 (de) * 1997-11-24 1999-05-27 Abb Research Ltd Verfahren zum Reinigen einer Abscheideelektrode eines Elektrofilters
FI108992B (fi) * 1998-05-26 2002-05-15 Metso Paper Inc Menetelmä ja laite hiukkasten erottamiseksi ilmavirrasta

Also Published As

Publication number Publication date
AU3168000A (en) 2000-09-28
KR100710697B1 (ko) 2007-04-23
CY1110286T1 (el) 2015-01-14
FI990484A0 (fi) 1999-03-05
ZA200107068B (en) 2002-03-05
JP4897142B2 (ja) 2012-03-14
CZ301801B6 (cs) 2010-06-30
CA2362721A1 (en) 2000-09-14
DK1165241T3 (da) 2010-03-15
PT1165241E (pt) 2010-02-03
CN1346296A (zh) 2002-04-24
ES2337979T3 (es) 2010-05-03
UA72499C2 (uk) 2005-03-15
BR0008762B1 (pt) 2014-07-22
FI990484L (fi) 2000-09-06
NO20014196D0 (no) 2001-08-29
EP1165241B1 (en) 2009-10-28
RU2235601C2 (ru) 2004-09-10
CZ20013122A3 (cs) 2002-02-13
CN1172753C (zh) 2004-10-27
CA2362721C (en) 2010-01-05
PL350430A1 (en) 2002-12-16
NO328514B1 (no) 2010-03-08
HK1043335A1 (en) 2002-09-13
TR200102534T2 (tr) 2002-01-21
NO20014196L (no) 2001-08-29
PL199884B1 (pl) 2008-11-28
ATE446807T1 (de) 2009-11-15
DE60043218D1 (de) 2009-12-10
AU773687B2 (en) 2004-06-03
JP2002537993A (ja) 2002-11-12
HU229018B1 (en) 2013-07-29
BR0008762A (pt) 2002-01-02
HUP0200199A2 (en) 2002-05-29
KR20010102506A (ko) 2001-11-15
US6632267B1 (en) 2003-10-14
WO2000053325A1 (en) 2000-09-14
EP1165241A1 (en) 2002-01-02
EE200100463A (et) 2002-12-16
SK12392001A3 (sk) 2002-03-05

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