Structural evolution of biomass char and its effect on the gasification rate

Hesameddin Fatehi, Xue Song Bai

Research output: Contribution to journalJournal articleResearchpeer-review

19 Citations (Scopus)

Abstract

The evolution of char porous structure can affect the conversion rate of the char by affecting the intra-particle transport, especially in the zone II conversion regime. A multi-pore model based on the capillary pore theory is developed to take into account different conversion rates for pores with different radii. The model is valid for biomass chars produced under relatively low heating rates, when the original beehive structure of the biomass is not destroyed during the pyrolysis stage. The contribution of different pores with different radius is taken into account using an effectiveness factor presented for each pore radius with respect to different reactions. As the char conversion proceeds, the pore enlargement increases the contribution of micro-pores; consequently the effective surface area will increase. The increase in the effective surface area leads to an increased reactivity of char during the entire conversion process. This model is used to analyze the steam gasification process of biomass char of centimeter sizes. The results from the present multi-pore model are in better agreement with experimental data than those from a corresponding single pore model. Since the multi-pore model accommodates the detailed intra-particle transport, it is a useful basis toward developing a more predictive model for biomass char gasification.
Original languageEnglish
JournalApplied Energy
Volume185
Issue numberPart 2
Pages (from-to)998–1006
Number of pages9
ISSN0306-2619
DOIs
Publication statusPublished - Jan 2017

Fingerprint

Gasification
Biomass
biomass
surface area
rate
gasification
effect
Heating rate
pyrolysis
Pyrolysis
Steam
heating

Keywords

  • Biomass char gasification
  • Pore surface reaction
  • Multi-pore model
  • Intra-particle transport

Cite this

Fatehi, Hesameddin ; Bai, Xue Song. / Structural evolution of biomass char and its effect on the gasification rate. In: Applied Energy. 2017 ; Vol. 185, No. Part 2. pp. 998–1006.
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Structural evolution of biomass char and its effect on the gasification rate. / Fatehi, Hesameddin; Bai, Xue Song.

In: Applied Energy, Vol. 185, No. Part 2, 01.2017, p. 998–1006.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Structural evolution of biomass char and its effect on the gasification rate

AU - Fatehi, Hesameddin

AU - Bai, Xue Song

PY - 2017/1

Y1 - 2017/1

N2 - The evolution of char porous structure can affect the conversion rate of the char by affecting the intra-particle transport, especially in the zone II conversion regime. A multi-pore model based on the capillary pore theory is developed to take into account different conversion rates for pores with different radii. The model is valid for biomass chars produced under relatively low heating rates, when the original beehive structure of the biomass is not destroyed during the pyrolysis stage. The contribution of different pores with different radius is taken into account using an effectiveness factor presented for each pore radius with respect to different reactions. As the char conversion proceeds, the pore enlargement increases the contribution of micro-pores; consequently the effective surface area will increase. The increase in the effective surface area leads to an increased reactivity of char during the entire conversion process. This model is used to analyze the steam gasification process of biomass char of centimeter sizes. The results from the present multi-pore model are in better agreement with experimental data than those from a corresponding single pore model. Since the multi-pore model accommodates the detailed intra-particle transport, it is a useful basis toward developing a more predictive model for biomass char gasification.

AB - The evolution of char porous structure can affect the conversion rate of the char by affecting the intra-particle transport, especially in the zone II conversion regime. A multi-pore model based on the capillary pore theory is developed to take into account different conversion rates for pores with different radii. The model is valid for biomass chars produced under relatively low heating rates, when the original beehive structure of the biomass is not destroyed during the pyrolysis stage. The contribution of different pores with different radius is taken into account using an effectiveness factor presented for each pore radius with respect to different reactions. As the char conversion proceeds, the pore enlargement increases the contribution of micro-pores; consequently the effective surface area will increase. The increase in the effective surface area leads to an increased reactivity of char during the entire conversion process. This model is used to analyze the steam gasification process of biomass char of centimeter sizes. The results from the present multi-pore model are in better agreement with experimental data than those from a corresponding single pore model. Since the multi-pore model accommodates the detailed intra-particle transport, it is a useful basis toward developing a more predictive model for biomass char gasification.

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KW - Pore surface reaction

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KW - Intra-particle transport

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M3 - Journal article

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JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

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