Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. I: Carbon conversion, gas yields and tar formation

Esa Kurkela (Corresponding Author), Pekka Ståhlberg

Research output: Contribution to journalArticleScientificpeer-review

90 Citations (Scopus)

Abstract

Fluidized bed air gasification of Finnish peat, sawdust and German brown coal were studied in a small pressurized fluidized-bed pilot plant operated at 0.4–1.0 MPa. The effects of air-to-fuel-ratio and other gasification variables on the conversion efficiencies and product yields are discussed in the article. Over 95% carbon conversion was achieved with all studied fuels under the best operating conditions. The lower heating value of the wet product gas ranged 3.5–5 MJ/Nm3. The highest heating value was achieved in low temperature gasification of wood, the light hydrocarbon gases representing nearly half of the gas heating value. The tar yields were dependent on the fuel type and on the freeboard temperature. The total yield of benzene and tars in wood gasification at 900°C was in the range of 3–4 wt% of dry ash-free fuel. In peat gasification the yield at the same freeboard temperature was only 0.7–1.2 wt% and in brown coal gasification below 0.5 wt%. The most stable components at higher freeboard temperatures were benzene and naphthalene. Toluene and phenol were almost completely decomposed when the temperature was raised above 850°C.

Original languageEnglish
Pages (from-to)1 - 21
Number of pages21
JournalFuel Processing Technology
Volume31
Issue number1
DOIs
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

Fingerprint

Tars
Peat
Coal
Tar
Lignite
Gasification
Fluidized beds
Wood
Carbon
Gases
Air
Benzene
Ashes
Temperature
Gas heating
Heating
Sawdust
Coal gasification
Toluene
Naphthalene

Keywords

  • gasification
  • fluidized beds

Cite this

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title = "Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. I: Carbon conversion, gas yields and tar formation",
abstract = "Fluidized bed air gasification of Finnish peat, sawdust and German brown coal were studied in a small pressurized fluidized-bed pilot plant operated at 0.4–1.0 MPa. The effects of air-to-fuel-ratio and other gasification variables on the conversion efficiencies and product yields are discussed in the article. Over 95{\%} carbon conversion was achieved with all studied fuels under the best operating conditions. The lower heating value of the wet product gas ranged 3.5–5 MJ/Nm3. The highest heating value was achieved in low temperature gasification of wood, the light hydrocarbon gases representing nearly half of the gas heating value. The tar yields were dependent on the fuel type and on the freeboard temperature. The total yield of benzene and tars in wood gasification at 900°C was in the range of 3–4 wt{\%} of dry ash-free fuel. In peat gasification the yield at the same freeboard temperature was only 0.7–1.2 wt{\%} and in brown coal gasification below 0.5 wt{\%}. The most stable components at higher freeboard temperatures were benzene and naphthalene. Toluene and phenol were almost completely decomposed when the temperature was raised above 850°C.",
keywords = "gasification, fluidized beds",
author = "Esa Kurkela and Pekka St{\aa}hlberg",
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doi = "10.1016/0378-3820(92)90038-R",
language = "English",
volume = "31",
pages = "1 -- 21",
journal = "Fuel Processing Technology",
issn = "0378-3820",
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}

Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. I : Carbon conversion, gas yields and tar formation. / Kurkela, Esa (Corresponding Author); Ståhlberg, Pekka.

In: Fuel Processing Technology, Vol. 31, No. 1, 1991, p. 1 - 21.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. I

T2 - Carbon conversion, gas yields and tar formation

AU - Kurkela, Esa

AU - Ståhlberg, Pekka

N1 - Project code: POV1001

PY - 1991

Y1 - 1991

N2 - Fluidized bed air gasification of Finnish peat, sawdust and German brown coal were studied in a small pressurized fluidized-bed pilot plant operated at 0.4–1.0 MPa. The effects of air-to-fuel-ratio and other gasification variables on the conversion efficiencies and product yields are discussed in the article. Over 95% carbon conversion was achieved with all studied fuels under the best operating conditions. The lower heating value of the wet product gas ranged 3.5–5 MJ/Nm3. The highest heating value was achieved in low temperature gasification of wood, the light hydrocarbon gases representing nearly half of the gas heating value. The tar yields were dependent on the fuel type and on the freeboard temperature. The total yield of benzene and tars in wood gasification at 900°C was in the range of 3–4 wt% of dry ash-free fuel. In peat gasification the yield at the same freeboard temperature was only 0.7–1.2 wt% and in brown coal gasification below 0.5 wt%. The most stable components at higher freeboard temperatures were benzene and naphthalene. Toluene and phenol were almost completely decomposed when the temperature was raised above 850°C.

AB - Fluidized bed air gasification of Finnish peat, sawdust and German brown coal were studied in a small pressurized fluidized-bed pilot plant operated at 0.4–1.0 MPa. The effects of air-to-fuel-ratio and other gasification variables on the conversion efficiencies and product yields are discussed in the article. Over 95% carbon conversion was achieved with all studied fuels under the best operating conditions. The lower heating value of the wet product gas ranged 3.5–5 MJ/Nm3. The highest heating value was achieved in low temperature gasification of wood, the light hydrocarbon gases representing nearly half of the gas heating value. The tar yields were dependent on the fuel type and on the freeboard temperature. The total yield of benzene and tars in wood gasification at 900°C was in the range of 3–4 wt% of dry ash-free fuel. In peat gasification the yield at the same freeboard temperature was only 0.7–1.2 wt% and in brown coal gasification below 0.5 wt%. The most stable components at higher freeboard temperatures were benzene and naphthalene. Toluene and phenol were almost completely decomposed when the temperature was raised above 850°C.

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KW - fluidized beds

U2 - 10.1016/0378-3820(92)90038-R

DO - 10.1016/0378-3820(92)90038-R

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