CA2512491A1 - Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream - Google Patents

Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream Download PDF

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Publication number
CA2512491A1
CA2512491A1 CA002512491A CA2512491A CA2512491A1 CA 2512491 A1 CA2512491 A1 CA 2512491A1 CA 002512491 A CA002512491 A CA 002512491A CA 2512491 A CA2512491 A CA 2512491A CA 2512491 A1 CA2512491 A1 CA 2512491A1
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Canada
Prior art keywords
flue gas
filter bed
gas stream
pollutants
bed unit
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Granted
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CA002512491A
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French (fr)
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CA2512491C (en
Inventor
Karim Zahedi
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Publication of CA2512491C publication Critical patent/CA2512491C/en
Expired - Fee Related legal-status Critical Current
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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
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/014—Addition of water; Heat exchange, e.g. by condensation
    • 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

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  • Treating Waste Gases (AREA)

Abstract

Pollutants in a flue gas stream from a dryer of products, such as wood chips, are removed by a pollution abatement system that includes an electrified filter bed unit for removing solid particulates. To prevent deteriorated operation of the electrified filter bed unit due to condensation of volatile organic compounds, the flue gas stream is heated, prior to admission to the electrified filter bed unit, to a temperature sufficient to convert condensable liquid aerosols to a gaseous state. The electrified filter bed unit then removes solid particulate selectively without collecting condensable organics.
After the flue gas stream has passed through the electrified filter bed unit, gaseous pollutants can be removed by an oxidation process, for example.

Claims (10)

1. Apparatus for drying particulate material and controlling emission of pollutants in flue gas, comprising a dryer using a hot gas stream, a pollution abatement system, and means for passing the flue gas through said pollution abatement system, wherein the flue gas contains particulate pollutants, gaseous pollutants, and condensable liquid aerosols, and wherein the pollution abatement system includes an electrified filter bed unit, and a heater, the flue gas being passed from the dryer through the heater and the electrified filter bed unit in that order, wherein the heater raises the temperature of the flue gas passed therethrough to a level sufficient to render liquid aerosols gaseous and to prevent condensation of the aerosols in the electrified filter bed unit, and the electrified filter bed unit removes particulates from the flue gas passed therethrough, without removing gaseous pollutants.
2. Apparatus according to claim 1, further comprising an incineration unit that receives flue gas passed from the electrified filter bed unit and that oxidizes gaseous pollutants in the flue gas.
3. Apparatus according to claim 1, wherein the heater is an air-to-air heat exchanger.
4. Apparatus according to claim 1, wherein the heater is an air/liquid heat exchanger.
5. Apparatus according to claim 1, wherein the heater is a direct hot gas mixing chamber.
6. A method of removing pollutants in a flue gas stream from a dryer of particulate materials, wherein the flue gas stream contains solid particulate pollutants, gaseous pollutants, and condensable liquid aerosol pollutants, said method comprising:
passing the flue gas stream through an electrified filter bed unit to remove the solid particulate pollutants from the flue gas stream; and prior to passing the flue gas stream through the electrified filter bed unit, heating the flue gas stream to a temperature sufficient to convert the condensable liquid aerosol pollutants to a gaseous phase and to maintain that phase as the flue gas stream is passed through the electrified filter bed unit, so that operation of the electrified filter bed unit is not impaired by condensation of the liquid aerosol pollutants in the electrified filter bed.
7. A method according to claim 6, wherein the flue gas stream is passed from the electrified filter bed unit to an incinerator to destroy gaseous pollutants.
8. A method according to claim 6, wherein the material dried comprises wood chips and the pollutants in the flue gas stream include volatile organic compounds that are driven off of the wood chips during the drying.
9. A method according to claim 8, wherein the wood chips are from southern and/or yellow pine.
10. A method according to claim 6, wherein the drying is performed in a dryer using hot gas supplied to the dryer in a temperature range of about 700°F to 1000°F, the flue gas stream is emitted from the dryer at a temperature range of about 200°F to 250°F, and prior to passing the flue gas stream through the electrified filter bed unit, the temperature of the flue gas stream is raised by about 50°F to 100°F.
CA002512491A 2004-10-25 2005-07-19 Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream Expired - Fee Related CA2512491C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/971,009 US6974494B1 (en) 2004-10-25 2004-10-25 Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream
US10/971,009 2004-10-25

Publications (2)

Publication Number Publication Date
CA2512491A1 true CA2512491A1 (en) 2006-04-25
CA2512491C CA2512491C (en) 2009-12-01

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Family Applications (1)

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CA002512491A Expired - Fee Related CA2512491C (en) 2004-10-25 2005-07-19 Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream

Country Status (2)

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US (1) US6974494B1 (en)
CA (1) CA2512491C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103055675A (en) * 2013-01-18 2013-04-24 大恩(天津)环境技术研发有限公司 Industrial smoke comprehensive treatment system and method based on advanced oxidation

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EP1888204A4 (en) * 2005-05-12 2012-02-29 Turbosonic Inc Pollution control in wood products dryer operation
US7318288B2 (en) * 2006-03-17 2008-01-15 Karim Zahedi Apparatus and method using an electrified filter bed for removal of pollutants from a flue gas stream
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US20090239429A1 (en) 2007-03-21 2009-09-24 Kipp Michael D Sound Attenuation Building Material And System
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US8591677B2 (en) 2008-11-04 2013-11-26 Ashtech Industries, Llc Utility materials incorporating a microparticle matrix formed with a setting agent
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Also Published As

Publication number Publication date
CA2512491C (en) 2009-12-01
US6974494B1 (en) 2005-12-13

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