The impact of biomass drying on the efficiency of a gasification plant co-producing Fischer-Tropsch fuels and heat: A conceptual investigation

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This study examines the impact of biomass drying on the overall efficiency of a Biomass-to-Liquids (BTL) process co-producing Fischer-Tropsch (FT) syncrude and heat. The proposed BTL process is based on steam-blown dual fluidised-bed gasification of biomass, simplified gas clean-up and FT synthesis. Biomass drying was found to have a significant effect on both the FT product yield and the overall thermal efficiency of the BTL plant. In the considered concept, FT off-gases are used as supplementary feedstock in the oxidiser, alongside with char, to satisfy the heat demand in gasification. Drying of the biomass feedstock leads to reduced need of water evaporation during gasification. This in turn reduces the demand for off-gases in the oxidiser, and allows to produce more syncrude (and less off-gases) in the FT unit. The simulations indicated that more extensive drying could result in a significant increase in FT syncrude yield: the thermal efficiency of FT syncryde production increased from 47.7% to 54.6% as the moisture mass fraction of the biomass feed was reduced from 30% to 8%. The highest overall thermal efficiencies of 85–88% were obtained with a two-stage drying concept that combines a belt dryer and an indirectly-heated steam dryer.

Original languageEnglish
Article number105272
JournalBiomass and Bioenergy
Volume127
DOIs
Publication statusE-pub ahead of print - 15 Jun 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

gasification
Gasification
Drying
Biomass
drying
heat
biomass
gases
dryers
feedstocks
Gases
gas
steam
Feedstocks
liquid
liquids
Liquids
Steam
Fischer-Tropsch synthesis
belts (equipment)

Keywords

  • Belt dryer
  • Biomass-to-Liquids
  • Dual fluidised-bed
  • Simulation
  • Steam dryer
  • Synthesis

Cite this

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title = "The impact of biomass drying on the efficiency of a gasification plant co-producing Fischer-Tropsch fuels and heat: A conceptual investigation",
abstract = "This study examines the impact of biomass drying on the overall efficiency of a Biomass-to-Liquids (BTL) process co-producing Fischer-Tropsch (FT) syncrude and heat. The proposed BTL process is based on steam-blown dual fluidised-bed gasification of biomass, simplified gas clean-up and FT synthesis. Biomass drying was found to have a significant effect on both the FT product yield and the overall thermal efficiency of the BTL plant. In the considered concept, FT off-gases are used as supplementary feedstock in the oxidiser, alongside with char, to satisfy the heat demand in gasification. Drying of the biomass feedstock leads to reduced need of water evaporation during gasification. This in turn reduces the demand for off-gases in the oxidiser, and allows to produce more syncrude (and less off-gases) in the FT unit. The simulations indicated that more extensive drying could result in a significant increase in FT syncrude yield: the thermal efficiency of FT syncryde production increased from 47.7{\%} to 54.6{\%} as the moisture mass fraction of the biomass feed was reduced from 30{\%} to 8{\%}. The highest overall thermal efficiencies of 85–88{\%} were obtained with a two-stage drying concept that combines a belt dryer and an indirectly-heated steam dryer.",
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author = "Sanna Tuomi and Esa Kurkela and Ilkka Hannula and Berg, {Carl Gustav}",
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The impact of biomass drying on the efficiency of a gasification plant co-producing Fischer-Tropsch fuels and heat : A conceptual investigation. / Tuomi, Sanna; Kurkela, Esa; Hannula, Ilkka; Berg, Carl Gustav.

In: Biomass and Bioenergy, Vol. 127, 105272, 15.06.2019.

Research output: Contribution to journalArticleScientificpeer-review

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