PCDD/F emissions from co-combustion of RDF with peat, wood waste and coal in FBC boilers

Juha Huotari, Raili Vesterinen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

The use of refuse derived fuel (RDF) as additional fuel in multifuel fluidized bed boilers (FBC) is a promising way for rational waste management. Several combustion experiments using RDF as additional fuel have been carried out in the research program of combustion and gasification technologies in Finland under the title Liekki 2.

The size of fluidized bed combustors used in these experiments ranged from 15 kWth up to 117 MWth. The chlorine content of fuel rose up to 0.35% as a measured dry base (db). The emissions of the toxic PCDD/F compounds were found to follow fuel-Cl content trendwise, as expected. However, quantitatively the relative emission levels varied with the factor of 103 at the same Cl- content in fuel. Using statistical analysis correlations between PCDD/F emissions and combustion conditions (Tg, CO etc.) as well as fuel and ash properties were found.

Most of the earlier measurements in commercial plants have been conducted usually after an electrostatic precipitator (ESP), which has made it difficult to relate emission results to corresponding combustion conditions. According to the laboratory scale fluidized bed reactor (15 kWth) using normal (primary and secondary) and staged (primary + secondary + tertiary) combustion air feeding, it was found that in the staged condition (higher vertical temperature profile) the total amount of PCDD/F compounds (gas and particles) decreased, but the amount of PCDD/F in solid phase increased.

Although the required European emission level of PCDD/F (0.1 ng/m3n I-TEQ, in 11% O2) can be achieved, the detailed formation and destruction mechanisms of PCDD/F in combustion conditions are not known well enough for quantitative determination of the emissions.
Original languageEnglish
Number of pages10
JournalHazardous Waste and Hazardous Materials
Volume13
Issue number1
DOIs
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

Fingerprint

Refuse derived fuels
Wood wastes
Peat
Coal
PCDD
Boilers
peat
combustion
coal
Ashes
Fluidized beds
Fluidized bed combustors
Electrostatic precipitators
Poisons
Chlorine
Carbon Monoxide
Waste management
Gasification
temperature profile
research program

Keywords

  • cocombustion
  • fluidized bed combustion
  • fluidized beds
  • refuse derived fuels
  • municipal solid waste
  • RDF
  • peat
  • wood fuels
  • wood wastes
  • coal
  • dibenzodioxins
  • dibenzofurans

Cite this

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title = "PCDD/F emissions from co-combustion of RDF with peat, wood waste and coal in FBC boilers",
abstract = "The use of refuse derived fuel (RDF) as additional fuel in multifuel fluidized bed boilers (FBC) is a promising way for rational waste management. Several combustion experiments using RDF as additional fuel have been carried out in the research program of combustion and gasification technologies in Finland under the title Liekki 2.The size of fluidized bed combustors used in these experiments ranged from 15 kWth up to 117 MWth. The chlorine content of fuel rose up to 0.35{\%} as a measured dry base (db). The emissions of the toxic PCDD/F compounds were found to follow fuel-Cl content trendwise, as expected. However, quantitatively the relative emission levels varied with the factor of 103 at the same Cl- content in fuel. Using statistical analysis correlations between PCDD/F emissions and combustion conditions (Tg, CO etc.) as well as fuel and ash properties were found.Most of the earlier measurements in commercial plants have been conducted usually after an electrostatic precipitator (ESP), which has made it difficult to relate emission results to corresponding combustion conditions. According to the laboratory scale fluidized bed reactor (15 kWth) using normal (primary and secondary) and staged (primary + secondary + tertiary) combustion air feeding, it was found that in the staged condition (higher vertical temperature profile) the total amount of PCDD/F compounds (gas and particles) decreased, but the amount of PCDD/F in solid phase increased.Although the required European emission level of PCDD/F (0.1 ng/m3n I-TEQ, in 11{\%} O2) can be achieved, the detailed formation and destruction mechanisms of PCDD/F in combustion conditions are not known well enough for quantitative determination of the emissions.",
keywords = "cocombustion, fluidized bed combustion, fluidized beds, refuse derived fuels, municipal solid waste, RDF, peat, wood fuels, wood wastes, coal, dibenzodioxins, dibenzofurans",
author = "Juha Huotari and Raili Vesterinen",
year = "1996",
doi = "10.1089/hwm.1996.13.1",
language = "English",
volume = "13",
journal = "Environmental Engineering Science",
issn = "1092-8758",
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PCDD/F emissions from co-combustion of RDF with peat, wood waste and coal in FBC boilers. / Huotari, Juha; Vesterinen, Raili.

In: Hazardous Waste and Hazardous Materials, Vol. 13, No. 1, 1996.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - PCDD/F emissions from co-combustion of RDF with peat, wood waste and coal in FBC boilers

AU - Huotari, Juha

AU - Vesterinen, Raili

PY - 1996

Y1 - 1996

N2 - The use of refuse derived fuel (RDF) as additional fuel in multifuel fluidized bed boilers (FBC) is a promising way for rational waste management. Several combustion experiments using RDF as additional fuel have been carried out in the research program of combustion and gasification technologies in Finland under the title Liekki 2.The size of fluidized bed combustors used in these experiments ranged from 15 kWth up to 117 MWth. The chlorine content of fuel rose up to 0.35% as a measured dry base (db). The emissions of the toxic PCDD/F compounds were found to follow fuel-Cl content trendwise, as expected. However, quantitatively the relative emission levels varied with the factor of 103 at the same Cl- content in fuel. Using statistical analysis correlations between PCDD/F emissions and combustion conditions (Tg, CO etc.) as well as fuel and ash properties were found.Most of the earlier measurements in commercial plants have been conducted usually after an electrostatic precipitator (ESP), which has made it difficult to relate emission results to corresponding combustion conditions. According to the laboratory scale fluidized bed reactor (15 kWth) using normal (primary and secondary) and staged (primary + secondary + tertiary) combustion air feeding, it was found that in the staged condition (higher vertical temperature profile) the total amount of PCDD/F compounds (gas and particles) decreased, but the amount of PCDD/F in solid phase increased.Although the required European emission level of PCDD/F (0.1 ng/m3n I-TEQ, in 11% O2) can be achieved, the detailed formation and destruction mechanisms of PCDD/F in combustion conditions are not known well enough for quantitative determination of the emissions.

AB - The use of refuse derived fuel (RDF) as additional fuel in multifuel fluidized bed boilers (FBC) is a promising way for rational waste management. Several combustion experiments using RDF as additional fuel have been carried out in the research program of combustion and gasification technologies in Finland under the title Liekki 2.The size of fluidized bed combustors used in these experiments ranged from 15 kWth up to 117 MWth. The chlorine content of fuel rose up to 0.35% as a measured dry base (db). The emissions of the toxic PCDD/F compounds were found to follow fuel-Cl content trendwise, as expected. However, quantitatively the relative emission levels varied with the factor of 103 at the same Cl- content in fuel. Using statistical analysis correlations between PCDD/F emissions and combustion conditions (Tg, CO etc.) as well as fuel and ash properties were found.Most of the earlier measurements in commercial plants have been conducted usually after an electrostatic precipitator (ESP), which has made it difficult to relate emission results to corresponding combustion conditions. According to the laboratory scale fluidized bed reactor (15 kWth) using normal (primary and secondary) and staged (primary + secondary + tertiary) combustion air feeding, it was found that in the staged condition (higher vertical temperature profile) the total amount of PCDD/F compounds (gas and particles) decreased, but the amount of PCDD/F in solid phase increased.Although the required European emission level of PCDD/F (0.1 ng/m3n I-TEQ, in 11% O2) can be achieved, the detailed formation and destruction mechanisms of PCDD/F in combustion conditions are not known well enough for quantitative determination of the emissions.

KW - cocombustion

KW - fluidized bed combustion

KW - fluidized beds

KW - refuse derived fuels

KW - municipal solid waste

KW - RDF

KW - peat

KW - wood fuels

KW - wood wastes

KW - coal

KW - dibenzodioxins

KW - dibenzofurans

U2 - 10.1089/hwm.1996.13.1

DO - 10.1089/hwm.1996.13.1

M3 - Article

VL - 13

JO - Environmental Engineering Science

JF - Environmental Engineering Science

SN - 1092-8758

IS - 1

ER -