Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Several Circulating Fluidised-Bed (CFB) gasifiers have been recently built in Finland to replace the use of fossil fuels in boilers and lime kilns. When clean wood feedstocks are used, the hot raw gas is usually led directly from the recycle cyclone to the boiler or kiln. In the case of contaminated wastederived fuels or high-alkali biomasses, filtration of the gas is usually required to protect the boiler or kiln from gas contaminants. In CFB gasification, the bed material, gasification temperature, the location of the fuel feeding point and the operation conditions of the filter unit are important design parameters, which must be optimised for the target fuel and end-application. High-alkali biomasses, like straw, are usually rather reactive but have to be gasified at relatively low temperature, and often special bed materials are needed to avoid ash sintering and deposition problems. The results from extensive test campaigns carried out at the CFB gasification Process Development Unit (PDU) of VTT are presented in this paper. The gasification tests were carried out using three different feedstocks: clean forest wood residues, demolition wood waste and crushed wheat straw pellets. The gasification tests with forest residues were focused on studying the effects of bed material, air distribution and fuel feeding point on the formation of tars and nitrogen compounds. The difference of using sand and limestone as the bed material was very significant as the CaO was effectively catalyzing tar decomposition. The fuel feeding point also had a strong effect on the gasification results especially on the tar yields. The tests with straw and demolition wood were on the other hand focused on finding stable gasifier operation conditions and on the other hand on the removal of gas contaminants by filtration.
Original languageEnglish
Title of host publicationProceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland
PublisherÅbo Akademi
Pages476-486
ISBN (Print)978-952-12-3222-0
Publication statusPublished - 2015
MoE publication typeB3 Non-refereed article in conference proceedings
Event22nd International Conference on Fluidized Bed Conversion, FBC 2015 - Turku, Finland
Duration: 14 Jun 201517 Jun 2015
Conference number: 22

Conference

Conference22nd International Conference on Fluidized Bed Conversion, FBC 2015
Abbreviated titleFBC 2015
CountryFinland
CityTurku
Period14/06/1517/06/15

Fingerprint

Demolition
Straw
Gasification
Wood
Tar
Kilns
Air
Boilers
Ashes
Gases
Feedstocks
Biomass
Impurities
Wood wastes
Nitrogen compounds
Limestone
Fossil fuels
Lime
Sintering
Sand

Keywords

  • gasification
  • forest residue
  • demolition wood
  • straw
  • high-alkali biomass
  • gas filtration

Cite this

Laatikainen-Luntama, J., & Kurkela, E. (2015). Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets. In Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland (pp. 476-486). Åbo Akademi.
Laatikainen-Luntama, Jaana ; Kurkela, Esa. / Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets. Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland. Åbo Akademi, 2015. pp. 476-486
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Laatikainen-Luntama, J & Kurkela, E 2015, Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets. in Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland. Åbo Akademi, pp. 476-486, 22nd International Conference on Fluidized Bed Conversion, FBC 2015, Turku, Finland, 14/06/15.

Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets. / Laatikainen-Luntama, Jaana; Kurkela, Esa.

Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland. Åbo Akademi, 2015. p. 476-486.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets

AU - Laatikainen-Luntama, Jaana

AU - Kurkela, Esa

PY - 2015

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N2 - Several Circulating Fluidised-Bed (CFB) gasifiers have been recently built in Finland to replace the use of fossil fuels in boilers and lime kilns. When clean wood feedstocks are used, the hot raw gas is usually led directly from the recycle cyclone to the boiler or kiln. In the case of contaminated wastederived fuels or high-alkali biomasses, filtration of the gas is usually required to protect the boiler or kiln from gas contaminants. In CFB gasification, the bed material, gasification temperature, the location of the fuel feeding point and the operation conditions of the filter unit are important design parameters, which must be optimised for the target fuel and end-application. High-alkali biomasses, like straw, are usually rather reactive but have to be gasified at relatively low temperature, and often special bed materials are needed to avoid ash sintering and deposition problems. The results from extensive test campaigns carried out at the CFB gasification Process Development Unit (PDU) of VTT are presented in this paper. The gasification tests were carried out using three different feedstocks: clean forest wood residues, demolition wood waste and crushed wheat straw pellets. The gasification tests with forest residues were focused on studying the effects of bed material, air distribution and fuel feeding point on the formation of tars and nitrogen compounds. The difference of using sand and limestone as the bed material was very significant as the CaO was effectively catalyzing tar decomposition. The fuel feeding point also had a strong effect on the gasification results especially on the tar yields. The tests with straw and demolition wood were on the other hand focused on finding stable gasifier operation conditions and on the other hand on the removal of gas contaminants by filtration.

AB - Several Circulating Fluidised-Bed (CFB) gasifiers have been recently built in Finland to replace the use of fossil fuels in boilers and lime kilns. When clean wood feedstocks are used, the hot raw gas is usually led directly from the recycle cyclone to the boiler or kiln. In the case of contaminated wastederived fuels or high-alkali biomasses, filtration of the gas is usually required to protect the boiler or kiln from gas contaminants. In CFB gasification, the bed material, gasification temperature, the location of the fuel feeding point and the operation conditions of the filter unit are important design parameters, which must be optimised for the target fuel and end-application. High-alkali biomasses, like straw, are usually rather reactive but have to be gasified at relatively low temperature, and often special bed materials are needed to avoid ash sintering and deposition problems. The results from extensive test campaigns carried out at the CFB gasification Process Development Unit (PDU) of VTT are presented in this paper. The gasification tests were carried out using three different feedstocks: clean forest wood residues, demolition wood waste and crushed wheat straw pellets. The gasification tests with forest residues were focused on studying the effects of bed material, air distribution and fuel feeding point on the formation of tars and nitrogen compounds. The difference of using sand and limestone as the bed material was very significant as the CaO was effectively catalyzing tar decomposition. The fuel feeding point also had a strong effect on the gasification results especially on the tar yields. The tests with straw and demolition wood were on the other hand focused on finding stable gasifier operation conditions and on the other hand on the removal of gas contaminants by filtration.

KW - gasification

KW - forest residue

KW - demolition wood

KW - straw

KW - high-alkali biomass

KW - gas filtration

M3 - Conference article in proceedings

SN - 978-952-12-3222-0

SP - 476

EP - 486

BT - Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland

PB - Åbo Akademi

ER -

Laatikainen-Luntama J, Kurkela E. Air-blown CFB gasification of forest residues, demolition wood and crushed wheat straw pellets. In Proceedings of the 22nd International Conference on Fluidized Bed Conversion, 14-17 June 2015, Turku, Finland. Åbo Akademi. 2015. p. 476-486