Experimentally determined storage and handling properties of fuel pellets made from torrefied whole-tree pine chips, logging residues and beech stem wood

Timo Järvinen, D. Agar (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)

Abstract

Torrefaction is currently of interest for the production of a new generation of fuel pellets suitable for increasing co-firing rates at pulverised-coal power plants. However, few results have been reported on properties of pellets which can currently be produced from torrefied materials. This data is required in order to evaluate the suitability of this fuel for its primary application. The objective of this study was to obtain measured results on storage and handling properties of pellets made of torrefied pine, logging residues (with and without wheat flour binder) and beech. Experimental methods, most of which adhere to standard procedures, are described. The measured properties include calorific value, bulk density, durability, hardness and equilibrium moisture content (EMC). Additionally, EMC isotherms of torrefied beech wood are presented. The results are analysed and their influence on the feasibility of large-scale pellet production is discussed. The measured and derived values presented will be of use in determining feasibility of torrefied pellet production in offsetting the use of fossil coal. From the results the following statements can be made regarding produced pellet samples:•Feedstock choice has a strongly influence on properties of torrefied pellets.•Durability of torrefied pellets is problematic compared to wood pellets.•Outdoor heap storage of torrefied pellets is not recommended.•Logging residues do not seem to be an optimal feedstock choice for torrefied pellets.•Wheat flour does not appear suitable as binder for torrefied pellets production due to water absorption.•Pelletising using high die temperature (above 170 °C) should be investigated.

Original languageEnglish
Pages (from-to)330-339
JournalFuel
Volume129
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Wood
Coal
Feedstocks
Binders
Durability
Moisture
Ore pellets
Pelletizing
Calorific value
Water absorption
Isotherms
Power plants
Hardness
Temperature

Keywords

  • torrefaction
  • torrefield pellets
  • co-firing
  • pellet properties
  • bio-coal

Cite this

@article{b167198ed15d477dbcb724ec9ee68232,
title = "Experimentally determined storage and handling properties of fuel pellets made from torrefied whole-tree pine chips, logging residues and beech stem wood",
abstract = "Torrefaction is currently of interest for the production of a new generation of fuel pellets suitable for increasing co-firing rates at pulverised-coal power plants. However, few results have been reported on properties of pellets which can currently be produced from torrefied materials. This data is required in order to evaluate the suitability of this fuel for its primary application. The objective of this study was to obtain measured results on storage and handling properties of pellets made of torrefied pine, logging residues (with and without wheat flour binder) and beech. Experimental methods, most of which adhere to standard procedures, are described. The measured properties include calorific value, bulk density, durability, hardness and equilibrium moisture content (EMC). Additionally, EMC isotherms of torrefied beech wood are presented. The results are analysed and their influence on the feasibility of large-scale pellet production is discussed. The measured and derived values presented will be of use in determining feasibility of torrefied pellet production in offsetting the use of fossil coal. From the results the following statements can be made regarding produced pellet samples:•Feedstock choice has a strongly influence on properties of torrefied pellets.•Durability of torrefied pellets is problematic compared to wood pellets.•Outdoor heap storage of torrefied pellets is not recommended.•Logging residues do not seem to be an optimal feedstock choice for torrefied pellets.•Wheat flour does not appear suitable as binder for torrefied pellets production due to water absorption.•Pelletising using high die temperature (above 170 °C) should be investigated.",
keywords = "torrefaction, torrefield pellets, co-firing, pellet properties, bio-coal",
author = "Timo J{\"a}rvinen and D. Agar",
year = "2014",
doi = "10.1016/j.fuel.2014.03.057",
language = "English",
volume = "129",
pages = "330--339",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier",

}

Experimentally determined storage and handling properties of fuel pellets made from torrefied whole-tree pine chips, logging residues and beech stem wood. / Järvinen, Timo; Agar, D. (Corresponding Author).

In: Fuel, Vol. 129, 2014, p. 330-339.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimentally determined storage and handling properties of fuel pellets made from torrefied whole-tree pine chips, logging residues and beech stem wood

AU - Järvinen, Timo

AU - Agar, D.

PY - 2014

Y1 - 2014

N2 - Torrefaction is currently of interest for the production of a new generation of fuel pellets suitable for increasing co-firing rates at pulverised-coal power plants. However, few results have been reported on properties of pellets which can currently be produced from torrefied materials. This data is required in order to evaluate the suitability of this fuel for its primary application. The objective of this study was to obtain measured results on storage and handling properties of pellets made of torrefied pine, logging residues (with and without wheat flour binder) and beech. Experimental methods, most of which adhere to standard procedures, are described. The measured properties include calorific value, bulk density, durability, hardness and equilibrium moisture content (EMC). Additionally, EMC isotherms of torrefied beech wood are presented. The results are analysed and their influence on the feasibility of large-scale pellet production is discussed. The measured and derived values presented will be of use in determining feasibility of torrefied pellet production in offsetting the use of fossil coal. From the results the following statements can be made regarding produced pellet samples:•Feedstock choice has a strongly influence on properties of torrefied pellets.•Durability of torrefied pellets is problematic compared to wood pellets.•Outdoor heap storage of torrefied pellets is not recommended.•Logging residues do not seem to be an optimal feedstock choice for torrefied pellets.•Wheat flour does not appear suitable as binder for torrefied pellets production due to water absorption.•Pelletising using high die temperature (above 170 °C) should be investigated.

AB - Torrefaction is currently of interest for the production of a new generation of fuel pellets suitable for increasing co-firing rates at pulverised-coal power plants. However, few results have been reported on properties of pellets which can currently be produced from torrefied materials. This data is required in order to evaluate the suitability of this fuel for its primary application. The objective of this study was to obtain measured results on storage and handling properties of pellets made of torrefied pine, logging residues (with and without wheat flour binder) and beech. Experimental methods, most of which adhere to standard procedures, are described. The measured properties include calorific value, bulk density, durability, hardness and equilibrium moisture content (EMC). Additionally, EMC isotherms of torrefied beech wood are presented. The results are analysed and their influence on the feasibility of large-scale pellet production is discussed. The measured and derived values presented will be of use in determining feasibility of torrefied pellet production in offsetting the use of fossil coal. From the results the following statements can be made regarding produced pellet samples:•Feedstock choice has a strongly influence on properties of torrefied pellets.•Durability of torrefied pellets is problematic compared to wood pellets.•Outdoor heap storage of torrefied pellets is not recommended.•Logging residues do not seem to be an optimal feedstock choice for torrefied pellets.•Wheat flour does not appear suitable as binder for torrefied pellets production due to water absorption.•Pelletising using high die temperature (above 170 °C) should be investigated.

KW - torrefaction

KW - torrefield pellets

KW - co-firing

KW - pellet properties

KW - bio-coal

U2 - 10.1016/j.fuel.2014.03.057

DO - 10.1016/j.fuel.2014.03.057

M3 - Article

VL - 129

SP - 330

EP - 339

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -