EP1284825A1 - Filtre a poussiere avec manche filtrante, electrode a couronne et electrode de precipitation - Google Patents

Filtre a poussiere avec manche filtrante, electrode a couronne et electrode de precipitation

Info

Publication number
EP1284825A1
EP1284825A1 EP01940008A EP01940008A EP1284825A1 EP 1284825 A1 EP1284825 A1 EP 1284825A1 EP 01940008 A EP01940008 A EP 01940008A EP 01940008 A EP01940008 A EP 01940008A EP 1284825 A1 EP1284825 A1 EP 1284825A1
Authority
EP
European Patent Office
Prior art keywords
filter
electrode
dust
hose
precipitation
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.)
Withdrawn
Application number
EP01940008A
Other languages
German (de)
English (en)
Inventor
Alois Scheuch
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.)
Scheuch GmbH
Original Assignee
Scheuch GmbH
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 Scheuch GmbH filed Critical Scheuch GmbH
Publication of EP1284825A1 publication Critical patent/EP1284825A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—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
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/38—Tubular collector electrode

Definitions

  • the invention relates to a dust filter according to the preamble of patent claim 1.
  • Dust-containing exhaust gases occur in many areas of industry, e.g. in wood processing, in the chipboard and fibreboard industry, the iron and steel industry, in foundries, the building materials industry or in metal production.
  • the use of various filters is common for cleaning the dust-laden exhaust gases.
  • the fabric filters usually consist of filter bags with a closed tube end, which are mostly supplied with the raw gas from the outside and in which the clean gas escapes at the open tube end.
  • the filter bags consist of a suitable fabric to which the contaminants adhere.
  • the cleaning is made by compressed air pulses of short duration. During cleaning, the gas flow in the filter fabric is reversed and the adhering dust cake is cleaned up by the inflation of the hose and the resulting acceleration, as well as by the purging effect of the compressed air flow. Depending on the type of contamination and the bag filter used, cleaning can also be carried out gently with low-pressure purge air that is blown into the interior of the filter.
  • the particles thrown off the filter hose during cleaning slide down between the filter hoses in the filter housing and are collected, for example, in a dust collection funnel and transported via a discharge screw into a container for disposal or recycling.
  • cleaning by shaking the filter bags is also common.
  • electrostatic precipitators for separating particles from exhaust gases are also common. In addition to solids, electrostatic precipitators can also be used to separate organic substances and odorous substances with good effects.
  • the majority of the dust particles in the electrostatic precipitator are negatively ionized by spray electrodes with negative direct voltage. The negatively charged dust particles migrate to the positively charged or grounded precipitation electrodes and deposit there over time in the form of a dust layer.
  • Both the spray electrodes, on which dust layers also form, and the precipitation electrodes are periodically cleaned, for example by knocking, and the falling dust, as with the fabric filters, is collected, for example, in a dust collection funnel and sent to containers for further disposal or recycling.
  • the cleaning is carried out by means of liquids which are directed onto the electrodes via the injection nozzles arranged above the filter and thus remove the contaminants with the washing liquid.
  • electrostatic precipitators are cleaned more quickly, since there is no problem with the accumulation of dust particles after cleaning the bag filters.
  • fabric filters have a higher degree of separation.
  • Filters are known which combine the advantages of electrostatic filters with the high degree of separation of fabric filters. Such combinations of bag filters made of fabric and electrostatic filters are called hybrid filters. For example, the high-voltage electrodes of an electrostatic filter are arranged between the bag filters. However, this did not solve the problem of the dust accumulating on the bag filters after the cleaning phase to a satisfactory degree.
  • a hybrid filter is proposed in US Pat. No. 5,938,818 A, which arranges a large number of bag filters in a filter housing and moreover between individual ones Filter hose rows arranged in the form of earthed electrodes in plate form and high-voltage electrodes between the filter hose rows, so that an electrostatic field is built up on each side of each hose row. Dust particles that pass through this zone are collected on the grounded sheet-like electrode. The pre-cleaned gas then flows through the fabric of the filter bags into the interior, where it is passed on to the clean gas outlet. Due to the electrostatic field and the corresponding distances between the filter hose, high-voltage electrode and precipitation electrode, most of the particles are attached to the precipitation electrode.
  • a two-stage cleaning compressed air pulse is also used, consisting of a first short compressed air pulse of high pressure and a subsequent second longer compressed air pulse with lower pressure.
  • the precipitation electrodes are accomplished by reversing the direction of the electric field between the electrodes.
  • the cleaning of the precipitation electrode by shaking or tapping can be improved.
  • the object of the present invention is to further improve the filter effect by increasing the degree of dust separation.
  • the disadvantages of known systems should be avoided or at least reduced.
  • the object of the invention is achieved in that Filter hose seen, which is arranged at least one spray electrode behind the at least one precipitation electrode.
  • the term “behind” means that the spray electrode is at a greater distance from the filter hose than the precipitation electrode from the filter hose.
  • the electrodes do not have to be aligned, but can also be offset from one another.
  • the dust particles ionized in the electric field between the spray electrodes and precipitation electrodes migrate to the precipitation surface and are largely deposited there. Those dust particles that do not adhere to the precipitation electrodes reach the filter bags and form a dust cake on the fabric surface.
  • the dust particles deposited on the filter hose are ionized, which supports the attachment to the grounded precipitation electrode when the filter hose is cleaned by compressed air pulses. It is thereby avoided that especially the fine dust particles get back to the filter surface immediately after the end of the cleaning pulse and thereby increase the filter resistance. This means that significantly higher filter loads are possible with a high degree of dust separation. This has a positive effect, especially with expensive filter media, since the fabric filter can be kept much smaller.
  • the area of the dust filter according to the invention which is effective for dust separation is larger, as a result of which the degree of dust separation can be increased or the filter can be made smaller with the same dust separation.
  • the at least one filter hose and any support basket arranged in the filter hose are advantageously electrically insulated, so that the electrically charged dust particles adhering to the filter hose fabric do not lose their charge.
  • the charge of the dust particles supports the movement of the filter bags in the direction of the grounded precipitation electrode.
  • the at least one precipitation electrode is tubular.
  • the surface of the precipitation electrode is substantially increased over prior art designs', whereby the frequency of cleaning of the collecting electrode can be reduced and a smaller Dust pollution of the filter bags follows.
  • a plurality of tubular precipitation electrodes are arranged in a row next to one another and at a distance from one another. This further increases the area of precipitation. A sufficient distance between the precipitation electrodes ensures a sufficient flow of the gas in the filter.
  • a plurality of filter bags each form at least one row of filter bags. This increases the filter surface and thus the filter's separation efficiency.
  • an electrostatic filter according to the invention is arranged on at least one side of each row of filter tubes, it is achieved that the gases to be cleaned must always pass through the ionization zone formed by the electrostatic filter before they reach the filter tubes.
  • At least one spray electrode is advantageously arranged between two filter hose rows and at least one precipitation electrode is arranged between the at least one spray electrode and each filter hose row. This significantly increases the cleaning of gases contaminated with pollutants.
  • At least one precipitation electrode is arranged on the outer side of at least one outermost row of filter tubes, the area of the filter which is effective for dust separation can be further enlarged, as a result of which the filter effect is further increased.
  • at least one precipitation electrode is arranged on the outer sides of the outermost rows of filter bags.
  • the row of filter bags lies between this or these outside precipitation electrodes and the closest spray electrode within an ionization zone, as a result of which the negatively charged particles are largely deposited on the precipitation electrodes when the filter bags are cleaned.
  • the at least one precipitation electrode is electrically grounded and the at least one spray electrode is at a negative direct voltage potential.
  • the at least one filter hose and / or the at least one precipitation electrode is advantageously arranged essentially vertically. This will make cleaning supported.
  • the dust-containing gas is advantageously flowed in essentially in the direction of the filter hose rows.
  • an essentially vertical baffle in front of the outermost filter hose of each filter hose row in the inflow direction of the dust-containing gas.
  • This baffle covers the filter bags and the surrounding precipitation electrodes, so that the dusty gases are immediately forced into the ionization zone built up between the spray electrodes and the precipitation electrodes and, after passing through the ionization zone, the ionized dust particles that do not deposit on the precipitation electrodes Continue moving filter bags.
  • the number and design of the baffles can be made according to the desired flow conditions.
  • Fig.l is a plan view of part of a dust filter according to an embodiment of the present invention during the filtering phase;
  • FIG. 2 shows a plan view of the part of the filter according to FIG. 1 during the cleaning phase
  • FIG. 3 shows a multi-stage dust filter according to the present invention in plan view
  • FIG. 4 shows a partially sectioned side view of the dust filter according to FIG. 3.
  • Fig.l is a filter bag row 6 consisting of three filter bags 1 is shown.
  • an electrostatic filter or an electrostatic filter alley 3 consisting of the spray electrodes 2 and precipitation electrodes 4 is arranged.
  • precipitation electrodes 4 are also arranged on the other side of the spray electrodes 2 and also on the other side of the filter hose row 6.
  • the filter bags 1 and any support baskets 7 arranged therein are preferably electrically insulated.
  • Precipitation electrodes 4 preferably consist of vertically arranged and spaced tubes which are electrically grounded.
  • the spray electrodes 2 are at a negative DC voltage level, as a result of which an electric field is built up between them and the precipitation electrodes 4. in which the dust particles 5 are ionized.
  • the electrical charge of the respective components of the dust filter is identified by the signs "+" and "-”.
  • the dust-containing gas is preferably flowed into the dust filter in the direction of the filter hose row 6. The direction of flow is indicated by the arrows X.
  • the raw gas is forced into the ionization zone between the spray electrodes 2 and the precipitation electrodes 4, where the dust particles are negatively charged , Most of the ionized dust particles 5 are deposited on the surface of the precipitation electrodes 4. Only a small proportion passes between the precipitation electrodes 4 and is passed through the gas flow to the filter bags 1, where they are deposited on the outside of the filter bags 1.
  • the electrical field between the spray electrodes 2 and the precipitation electrodes 4 causes the dust particles 5 to move in the direction of the arrows A.
  • an electrostatic filter lane 3 is arranged between each two rows of filter tubes 6, each consisting of a spray electrode 2 and precipitation electrodes 4 arranged on both sides.
  • the distance can between the spray electrodes 2 and the filter bags 1 turn out to be significantly smaller than in known arrangements, where no precipitation electrode is arranged between the spray electrodes and the filter bags.
  • the distance between the spray electrodes 2 and the filter bags 1 must be considerably greater than the distance between the spray electrodes 2 and the precipitation electrodes 4, since otherwise the spray electrodes 2 will roll over to the wires of the support baskets 7 of the filter bags 1 if the distances are too small would, whereby the tissue of the filter bags 1 would be perforated. Because the filter bags 1 are to a lesser extent dust particles 5, they only have to be cleaned at larger "time intervals.
  • the cleaning of the precipitation electrodes 4 is preferably done by tapping and can also be done less frequently due to the enlarged surface compared to a plate-shaped electrode
  • the filter arrangement according to the invention has the advantage that a significantly higher filter load is possible with a high degree of dust separation at the same time.
  • the degree of separation of the electrostatic filter lane 3 can be significantly improved since the flow speed in the electrostatic filter is lower
  • the present invention has the advantage that when the bag filter is cleaned, the fine dust does not have to pass through the ionization zone again in order to reach the precipitation areas, but directly from the filter also get to the precipitation electrodes.
  • Figures 3 and 4 show a plan view and a 'partially sectioned side view of a multi-stage dust filter constructed according to the invention, in which two filter hose rows 6 are shown, the filter hose row 6 shown on the left being in the filtering phase and the right filter hose row 6 in the cleaning phase.
  • the nozzles for delivering the compressed air pulses for cleaning the filter bags 1 are located above the filter bags.
  • the compressed air is supplied via corresponding compressed air lines 10, only a part of which is shown.
  • a compressed air pulse is emitted via the nozzles 9, which is blown into the filter hose 1 equipped with a support basket 7.
  • the filter tube 1 closed at the bottom is inflated and the dust particles 5 located thereon are moved against the precipitation electrodes 4 in the direction of the arrows B.
  • the cleaned gas flows according to the arrows Y through the open end of the filter bags into the clean gas space of the filter.
  • the distance between two rows of filter tubes 6 can be chosen smaller in the present arrangement, since a larger area of the filter is effective for dust separation.
  • the arrangement of the electrostatic filters constructed according to the invention between the filter hose rows can be repeated as often as required, depending on the number of filter stages and the size of the cleaning system.

Landscapes

  • Electrostatic Separation (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

Filtre à poussière qui comporte au moins une manche filtrante (1) fermée à son extrémité inférieure, sur laquelle sont envoyés depuis l'extérieur les gaz contenant de la poussière, et au moins un électrofiltre (3) pourvu d'au moins une électrode de précipitation (4) et d'au moins une électrode à couronne (2) soumise à un potentiel négatif par rapport à l'électrode de précipitation (4). Le filtre selon la présente invention permet d'améliorer l'effet de filtrage par une augmentation du degré de dépôt des poussières. A cet effet, vue depuis la manche filtrante (1), l'électrode à couronne (2) au moins est placée derrière l'électrode de précipitation (4) au moins. Les manches filtrantes (1) et les éventuels paniers de soutien (7) sont avantageusement isolés électriquement. Lors du nettoyage des manches filtrantes (1), les particules de poussière ionisées (5) se déposent pour la plus grande partie sur les électrodes de précipitation (4) qui se trouvent à proximité immédiate.
EP01940008A 2000-05-31 2001-05-31 Filtre a poussiere avec manche filtrante, electrode a couronne et electrode de precipitation Withdrawn EP1284825A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0096000A AT408843B (de) 2000-05-31 2000-05-31 Staubfilter
AT9602000 2000-05-31
PCT/AT2001/000179 WO2001091908A1 (fr) 2000-05-31 2001-05-31 Filtre a poussiere avec manche filtrante, electrode a couronne et electrode de precipitation

Publications (1)

Publication Number Publication Date
EP1284825A1 true EP1284825A1 (fr) 2003-02-26

Family

ID=3683559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01940008A Withdrawn EP1284825A1 (fr) 2000-05-31 2001-05-31 Filtre a poussiere avec manche filtrante, electrode a couronne et electrode de precipitation

Country Status (9)

Country Link
US (1) US6869467B2 (fr)
EP (1) EP1284825A1 (fr)
AT (1) AT408843B (fr)
AU (1) AU2001273726A1 (fr)
CA (1) CA2413993A1 (fr)
HU (1) HUP0301744A2 (fr)
PL (1) PL365585A1 (fr)
SK (1) SK15672002A3 (fr)
WO (1) WO2001091908A1 (fr)

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US7559976B2 (en) * 2006-10-24 2009-07-14 Henry Krigmont Multi-stage collector for multi-pollutant control
WO2008112306A1 (fr) * 2007-03-14 2008-09-18 Tucker Richard D Systèmes et procédés de pyrolyse, et résultats en provenant
US9604192B2 (en) 2007-03-14 2017-03-28 Richard D. TUCKER Pyrolysis and gasification systems, methods, and resultants derived therefrom
US8784616B2 (en) * 2007-03-14 2014-07-22 Tucker Engineering Associates, Inc. Pyrolysis systems, methods, and resultants derived therefrom
US7582145B2 (en) * 2007-12-17 2009-09-01 Krigmont Henry V Space efficient hybrid collector
US7582144B2 (en) * 2007-12-17 2009-09-01 Henry Krigmont Space efficient hybrid air purifier
US7695551B2 (en) * 2008-03-12 2010-04-13 Bha Group, Inc. Apparatus for filtering gas turbine inlet air
US8038776B2 (en) * 2008-03-12 2011-10-18 Bha Group, Inc. Apparatus for filtering gas turbine inlet air
US7527674B1 (en) 2008-03-12 2009-05-05 Bha Group, Inc. Apparatus for filtering gas turbine inlet air
US7597750B1 (en) * 2008-05-12 2009-10-06 Henry Krigmont Hybrid wet electrostatic collector
US7819945B2 (en) * 2008-10-30 2010-10-26 Cymer, Inc. Metal fluoride trap
US9797864B2 (en) * 2011-05-24 2017-10-24 Carrier Corporation Current monitoring in electrically enhanced air filtration system
DE102013113334A1 (de) * 2013-12-02 2015-06-03 Jochen Deichmann Vorrichtung zum Reinigen von Gasen
JP6290824B2 (ja) * 2015-05-22 2018-03-07 トヨタ自動車株式会社 排気浄化装置
JP6956714B2 (ja) * 2015-10-30 2021-11-02 エルジー エレクトロニクス インコーポレイティドＬｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｉｎｃ． 空気清浄装置
CN108499735A (zh) * 2017-02-27 2018-09-07 袁野 结露型电除尘器
CN115007314B (zh) * 2022-05-30 2023-05-16 福建龙净环保股份有限公司 一种耦合增强电袋复合除尘装置

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Also Published As

Publication number Publication date
US20030159584A1 (en) 2003-08-28
SK15672002A3 (sk) 2003-03-04
PL365585A1 (en) 2005-01-10
HUP0301744A2 (en) 2003-08-28
AU2001273726A1 (en) 2001-12-11
US6869467B2 (en) 2005-03-22
ATA9602000A (de) 2001-08-15
CA2413993A1 (fr) 2002-12-02
AT408843B (de) 2002-03-25
WO2001091908A1 (fr) 2001-12-06

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