Effect of pressure on tar decomposition activity of different bed materials in biomass gasification conditions

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Abstract

The objective of this study was to compare the tar decomposing activity of different bed materials and to investigate the effect of pressure on their activity at pressures up to 10 bar. Gasification experiments were first conducted in an atmospheric pressure bubbling fluidised-bed gasifier, while the influence of pressure was studied in a laboratory-scale fixed-bed reactor with simulated gasification gas. The tested bed materials were sand, dolomite, MgO, olivine A and a 50/50 wt.% mixture of olivine B and kaolin. At atmospheric pressure both in gasification and laboratory-scale experiments, dolomite and MgO were the most active bed materials. In air/steam-blown fluidised-bed gasification conditions, all the studied bed materials were capable of reducing the tar content in reference to the base case sand; the reductions amounted to 87%, 83% and 54% with dolomite, MgO and olivine B/kaolin mixture, respectively. Increasing pressure decreased the tar decomposing activities of dolomite and MgO. On the other hand, higher pressure enhanced thermal tar decomposition reactions over sand and olivine A. In pressurised conditions at 5 bar, the carbonate and oxide forms of dolomite (calcium either as CaCO3 or CaO) had similar activities implying that the observed loss in activity at higher pressures was more attributed to the pressure rather than the calcination.
Original languageEnglish
Pages (from-to)293-305
JournalFuel
Volume158
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Tars
Tar
Gasification
Biomass
Olivine
Decomposition
Kaolin
Sand
Atmospheric pressure
Carbonates
Steam
Calcination
Oxides
Calcium
Gases
Experiments
dolomite
olivine
Air

Keywords

  • biomass gasification
  • tar
  • bed materials
  • pressure
  • tar decomposition

Cite this

@article{491c6ea43c86483fb3234161e7a0717b,
title = "Effect of pressure on tar decomposition activity of different bed materials in biomass gasification conditions",
abstract = "The objective of this study was to compare the tar decomposing activity of different bed materials and to investigate the effect of pressure on their activity at pressures up to 10 bar. Gasification experiments were first conducted in an atmospheric pressure bubbling fluidised-bed gasifier, while the influence of pressure was studied in a laboratory-scale fixed-bed reactor with simulated gasification gas. The tested bed materials were sand, dolomite, MgO, olivine A and a 50/50 wt.{\%} mixture of olivine B and kaolin. At atmospheric pressure both in gasification and laboratory-scale experiments, dolomite and MgO were the most active bed materials. In air/steam-blown fluidised-bed gasification conditions, all the studied bed materials were capable of reducing the tar content in reference to the base case sand; the reductions amounted to 87{\%}, 83{\%} and 54{\%} with dolomite, MgO and olivine B/kaolin mixture, respectively. Increasing pressure decreased the tar decomposing activities of dolomite and MgO. On the other hand, higher pressure enhanced thermal tar decomposition reactions over sand and olivine A. In pressurised conditions at 5 bar, the carbonate and oxide forms of dolomite (calcium either as CaCO3 or CaO) had similar activities implying that the observed loss in activity at higher pressures was more attributed to the pressure rather than the calcination.",
keywords = "biomass gasification, tar, bed materials, pressure, tar decomposition",
author = "Sanna Tuomi and Noora Kaisalo and Pekka Simell and Esa Kurkela",
note = "LIS: 24 embargo",
year = "2015",
doi = "10.1016/j.fuel.2015.05.051",
language = "English",
volume = "158",
pages = "293--305",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of pressure on tar decomposition activity of different bed materials in biomass gasification conditions

AU - Tuomi, Sanna

AU - Kaisalo, Noora

AU - Simell, Pekka

AU - Kurkela, Esa

N1 - LIS: 24 embargo

PY - 2015

Y1 - 2015

N2 - The objective of this study was to compare the tar decomposing activity of different bed materials and to investigate the effect of pressure on their activity at pressures up to 10 bar. Gasification experiments were first conducted in an atmospheric pressure bubbling fluidised-bed gasifier, while the influence of pressure was studied in a laboratory-scale fixed-bed reactor with simulated gasification gas. The tested bed materials were sand, dolomite, MgO, olivine A and a 50/50 wt.% mixture of olivine B and kaolin. At atmospheric pressure both in gasification and laboratory-scale experiments, dolomite and MgO were the most active bed materials. In air/steam-blown fluidised-bed gasification conditions, all the studied bed materials were capable of reducing the tar content in reference to the base case sand; the reductions amounted to 87%, 83% and 54% with dolomite, MgO and olivine B/kaolin mixture, respectively. Increasing pressure decreased the tar decomposing activities of dolomite and MgO. On the other hand, higher pressure enhanced thermal tar decomposition reactions over sand and olivine A. In pressurised conditions at 5 bar, the carbonate and oxide forms of dolomite (calcium either as CaCO3 or CaO) had similar activities implying that the observed loss in activity at higher pressures was more attributed to the pressure rather than the calcination.

AB - The objective of this study was to compare the tar decomposing activity of different bed materials and to investigate the effect of pressure on their activity at pressures up to 10 bar. Gasification experiments were first conducted in an atmospheric pressure bubbling fluidised-bed gasifier, while the influence of pressure was studied in a laboratory-scale fixed-bed reactor with simulated gasification gas. The tested bed materials were sand, dolomite, MgO, olivine A and a 50/50 wt.% mixture of olivine B and kaolin. At atmospheric pressure both in gasification and laboratory-scale experiments, dolomite and MgO were the most active bed materials. In air/steam-blown fluidised-bed gasification conditions, all the studied bed materials were capable of reducing the tar content in reference to the base case sand; the reductions amounted to 87%, 83% and 54% with dolomite, MgO and olivine B/kaolin mixture, respectively. Increasing pressure decreased the tar decomposing activities of dolomite and MgO. On the other hand, higher pressure enhanced thermal tar decomposition reactions over sand and olivine A. In pressurised conditions at 5 bar, the carbonate and oxide forms of dolomite (calcium either as CaCO3 or CaO) had similar activities implying that the observed loss in activity at higher pressures was more attributed to the pressure rather than the calcination.

KW - biomass gasification

KW - tar

KW - bed materials

KW - pressure

KW - tar decomposition

U2 - 10.1016/j.fuel.2015.05.051

DO - 10.1016/j.fuel.2015.05.051

M3 - Article

VL - 158

SP - 293

EP - 305

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -