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WO1993020926A1 - Method for cleaning flue gases - Google Patents

Method for cleaning flue gases Download PDF

Info

Publication number
WO1993020926A1
WO1993020926A1 PCT/SE1993/000163 SE9300163W WO9320926A1 WO 1993020926 A1 WO1993020926 A1 WO 1993020926A1 SE 9300163 W SE9300163 W SE 9300163W WO 9320926 A1 WO9320926 A1 WO 9320926A1
Authority
WO
WIPO (PCT)
Prior art keywords
soot
flue gases
incineration
gas duct
flue gas
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
PCT/SE1993/000163
Other languages
French (fr)
Inventor
Peter Odenmo
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.)
ABB Technology FLB AB
Original Assignee
ABB Flaekt AB
Flaekt AB
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 ABB Flaekt AB, Flaekt AB filed Critical ABB Flaekt AB
Publication of WO1993020926A1 publication Critical patent/WO1993020926A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • B01D53/70—Organic halogen compounds
    • 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
    • F23J15/006—Layout of treatment plant

Definitions

  • the present invention relates to a method for clean ⁇ ing flue gases generated upon incineration in an incine- rator, especially upon incineration of refuse, in which method the flue gases are conducted through a flue gas duct to an installation for separating particulate impu ⁇ rities.
  • active carbon or active coke for separating dioxines and mercury which are present in particular in the flue gases resulting from the incineration of refuse.
  • Particulate active carbon or active coke is blown into the flue gas duct.
  • the particles of carbon or coke adsorb dioxines and mercury, and are subsequently separated in the separating installation.
  • the object of the present invention is, therefore, to provide a simple and inexpensive method for cleaning flue gases, especially of dioxines and mercury.
  • this object is achieved by a method which is of the above type and is character- ised by performing soot-generating incineration of a fuel with a deficiency of oxygen; and mixing the generated soot with the flue gases in the flue gas duct.
  • the soot-generating incineration can be performed in an incineration unit located outside the flue gas duct.
  • the soot-generating incineration can be performed with the aid of a burner unit placed in the flue gas duct.
  • An incinerator 1 is supplied with fuel in the form of refuse, such as combustible household waste and indus ⁇ trial waste.
  • the flue gases generated upon the refuse incineration contain dioxines and mercury. This invention is especially directed to the separation of precisely dioxines and mercury.
  • the flue gases are conducted from the incinerator 1, via a flue gas duct 2, to an installation 3 for separat ⁇ ing gaseous impurities, such as sulphur dioxide and hydro- gen chloride, and then to an installation 4 for separat ⁇ ing particulate impurities (dust).
  • the installation 3 is a wet scrubber, but it may also be a contact reactor of some other type.
  • the instal ⁇ lation 4 here is a barrier filter unit in the form of a bag filter with textile filter bags, but it may also be an electrostatic dust separator.
  • the working tempe ⁇ rature in the barrier filter unit is 60-150°C.
  • the f ue gases are conducted from the installation 4 on to other treatment installations before being finally emitted into the atmosphere through a chimney (not shown).
  • soot-generating incinera ⁇ tion of a fuel is performed with a deficiency of oxygen.
  • the thus-generated soot-laden flue gases are introduced into the flue.gas duct 2 between the gas separator 3 and the dust separator 4.
  • the soot particles adsorb dioxines and mercury before being separated in the dust separator 4.
  • soot-generating incineration it is much easier and considerably less expensive to thus perform soot-generating incineration according to the invention and use the generated soot for adsorbing dioxines and mercury than to use, for this purpose, active carbon or active coke according to the prior-art tech- nique described in the foregoing.
  • the soot- laden flue gases from the unit 5 may, for example, be introduced, into the flue gas duct 2 between the incinera- tor 1 and the gas separator 3.
  • the unit 5 can be replaced with a burner provided in the flue gas duct 2 between the dust separator 3 and the dust separator 4 and burning, in soot-generating fashion, a fuel with which it is supplied. Then, the burner raises the temperature in the flue gas duct 2, which confers the advantage that the temperature in the gas separator 3 can be reduced, whereby to increase the degree of separation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

In a method for cleaning flue gases generated upon incineration in an incinerator (1), especially upon incineration of refuse, the flue gases are conducted through a flue gas duct (2) to an installation (4) for separating particulate impurities. Soot-generating incineration of a fuel is performed with a deficiency of oxygen, and the generated soot is mixed with the flue gases in the flue gas duct (2).

Description

METHOD FOR CLEANING FLUE GASES
The present invention relates to a method for clean¬ ing flue gases generated upon incineration in an incine- rator, especially upon incineration of refuse, in which method the flue gases are conducted through a flue gas duct to an installation for separating particulate impu¬ rities.
In a prior-art method of this type, use is made of active carbon or active coke for separating dioxines and mercury which are present in particular in the flue gases resulting from the incineration of refuse. Particulate active carbon or active coke is blown into the flue gas duct. The particles of carbon or coke adsorb dioxines and mercury, and are subsequently separated in the separating installation.
Active carbon and active coke are expensive mate¬ rials, which in addition are difficult to handle in powder or particle form. The object of the present invention is, therefore, to provide a simple and inexpensive method for cleaning flue gases, especially of dioxines and mercury.
According to the invention, this object is achieved by a method which is of the above type and is character- ised by performing soot-generating incineration of a fuel with a deficiency of oxygen; and mixing the generated soot with the flue gases in the flue gas duct.
The soot-generating incineration can be performed in an incineration unit located outside the flue gas duct. Alternatively, the soot-generating incineration can be performed with the aid of a burner unit placed in the flue gas duct.
The invention will now be described in more detail with reference to the accompanying drawing, which highly schematically illustrates an installation for performing the inventive method. An incinerator 1 is supplied with fuel in the form of refuse, such as combustible household waste and indus¬ trial waste. The flue gases generated upon the refuse incineration contain dioxines and mercury. This invention is especially directed to the separation of precisely dioxines and mercury.
The flue gases are conducted from the incinerator 1, via a flue gas duct 2, to an installation 3 for separat¬ ing gaseous impurities, such as sulphur dioxide and hydro- gen chloride, and then to an installation 4 for separat¬ ing particulate impurities (dust). In this particular instance, the installation 3 is a wet scrubber, but it may also be a contact reactor of some other type. The instal¬ lation 4 here is a barrier filter unit in the form of a bag filter with textile filter bags, but it may also be an electrostatic dust separator. Suitably, the working tempe¬ rature in the barrier filter unit is 60-150°C. Optionally, the f ue gases are conducted from the installation 4 on to other treatment installations before being finally emitted into the atmosphere through a chimney (not shown).
In an incineration unit 5, soot-generating incinera¬ tion of a fuel is performed with a deficiency of oxygen. The thus-generated soot-laden flue gases are introduced into the flue.gas duct 2 between the gas separator 3 and the dust separator 4. The soot particles adsorb dioxines and mercury before being separated in the dust separator 4.
It is much easier and considerably less expensive to thus perform soot-generating incineration according to the invention and use the generated soot for adsorbing dioxines and mercury than to use, for this purpose, active carbon or active coke according to the prior-art tech- nique described in the foregoing.
The method described can be modified in different ways within the scope of the invention. Thus, the soot- laden flue gases from the unit 5 may, for example, be introduced, into the flue gas duct 2 between the incinera- tor 1 and the gas separator 3. In special applications, the unit 5 can be replaced with a burner provided in the flue gas duct 2 between the dust separator 3 and the dust separator 4 and burning, in soot-generating fashion, a fuel with which it is supplied. Then, the burner raises the temperature in the flue gas duct 2, which confers the advantage that the temperature in the gas separator 3 can be reduced, whereby to increase the degree of separation.

Claims

1. A method for cleaning flue gases generated upon incineration in an incinerator (1), especially upon inci¬ neration of refuse, in which method the flue gases are conducted through a flue gas duct (2) to an installation (4) for separating particulate impurities, c h a r a c ¬ t e r i s e d by performing soot-generating incineration of a fuel with a deficiency of oxygen; and mixing the generated soot with the flue gases in the flue gas duct (2).
2. A method as claimed in claim 1, c h a r a c ¬ t e r i s e d by performing the soot-generating incine- ration in an incineration unit (5) located outside the flue gas duct (2).
3. A method as claimed in claim 1, c h a r a c ¬ t e r i s e d by performing the soot-generating incine¬ ration with the aid of a burner placed in the flue gas duct (2).
PCT/SE1993/000163 1992-04-16 1993-02-26 Method for cleaning flue gases Ceased WO1993020926A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9201232A SE501158C2 (en) 1992-04-16 1992-04-16 Ways to clean flue gases with a deficit of oxygen and formed soot
SE9201232-7 1992-04-16

Publications (1)

Publication Number Publication Date
WO1993020926A1 true WO1993020926A1 (en) 1993-10-28

Family

ID=20385997

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1993/000163 Ceased WO1993020926A1 (en) 1992-04-16 1993-02-26 Method for cleaning flue gases

Country Status (3)

Country Link
AU (1) AU3910493A (en)
SE (1) SE501158C2 (en)
WO (1) WO1993020926A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0847795A1 (en) * 1996-12-06 1998-06-17 Kabushiki Kaisha Kawasaki Giken Method of removing dioxins in waste incineration plant
EP2111906A1 (en) 2003-06-03 2009-10-28 ALSTOM Technology Ltd Method and apparatus for removing mercury from flue gas of solid fuel combustion
US7780765B2 (en) 2003-06-03 2010-08-24 Alstom Technologies Ltd Control of mercury emissions from solid fuel combustion
US8277545B2 (en) 2007-12-21 2012-10-02 Alstom Technology Ltd Method of reducing an amount of mercury in a flue gas
US8828341B1 (en) 2013-07-18 2014-09-09 Alstom Technology Ltd Sulfite control to reduce mercury re-emission
US9120055B2 (en) 2014-01-27 2015-09-01 Alstom Technology Ltd Mercury re-emission control
US9669351B2 (en) 2003-06-03 2017-06-06 General Electric Technology Gmbh Removal of mercury emissions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338183A2 (en) * 1988-04-22 1989-10-25 Howorka, Franz Device for decomposing fluid pollutants by heat
SE466814B (en) * 1989-06-01 1992-04-06 Kvaerner Generator Ab DEVICE FOR DEGRADATION OF GASES GENERATED FOR PRESENT BURNING AT UNGEFER 850 DEGREES C OF THE SOLID BROWN IN A LIQUID BED

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338183A2 (en) * 1988-04-22 1989-10-25 Howorka, Franz Device for decomposing fluid pollutants by heat
SE466814B (en) * 1989-06-01 1992-04-06 Kvaerner Generator Ab DEVICE FOR DEGRADATION OF GASES GENERATED FOR PRESENT BURNING AT UNGEFER 850 DEGREES C OF THE SOLID BROWN IN A LIQUID BED

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 82, C-481; & JP,A,62 216 630 (MITSUBISHI HEAVY IND LTD), 24 Sept 1987. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0847795A1 (en) * 1996-12-06 1998-06-17 Kabushiki Kaisha Kawasaki Giken Method of removing dioxins in waste incineration plant
EP2111906A1 (en) 2003-06-03 2009-10-28 ALSTOM Technology Ltd Method and apparatus for removing mercury from flue gas of solid fuel combustion
US7780765B2 (en) 2003-06-03 2010-08-24 Alstom Technologies Ltd Control of mercury emissions from solid fuel combustion
EP2295129A1 (en) 2003-06-03 2011-03-16 Alstom Technology Ltd Method and apparatus for removing mercury from flue gas of solid fuel combustion
US8069797B2 (en) 2003-06-03 2011-12-06 Alstom Technology Ltd. Control of mercury emissions from solid fuel combustion
US9669351B2 (en) 2003-06-03 2017-06-06 General Electric Technology Gmbh Removal of mercury emissions
US8277545B2 (en) 2007-12-21 2012-10-02 Alstom Technology Ltd Method of reducing an amount of mercury in a flue gas
US8828341B1 (en) 2013-07-18 2014-09-09 Alstom Technology Ltd Sulfite control to reduce mercury re-emission
US9120055B2 (en) 2014-01-27 2015-09-01 Alstom Technology Ltd Mercury re-emission control

Also Published As

Publication number Publication date
SE9201232L (en) 1993-10-17
SE9201232D0 (en) 1992-04-16
AU3910493A (en) 1993-11-18
SE501158C2 (en) 1994-11-28

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