TY - JOUR

T1 - Quality effects caused by torrefaction of pellets made from Scots pine

A1 - Shang,Lei

A1 - Nielsen,Niels Peter K.

A1 - Dahl,Jonas

A1 - Stelte,Wolfgang

A1 - Ahrenfeldt,Jesper

A1 - Holm,Jens Kai

A1 - Thomsen,Tobias

A1 - Henriksen,Ulrik B.

AU - Shang,Lei

AU - Nielsen,Niels Peter K.

AU - Dahl,Jonas

AU - Stelte,Wolfgang

AU - Ahrenfeldt,Jesper

AU - Holm,Jens Kai

AU - Thomsen,Tobias

AU - Henriksen,Ulrik B.

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - <p>The purpose of the study was to investigate the influence of torrefaction on the quality of Scots pine pellets. Pellet samples were torrefied at 230, 250 and 270°C for 1h in nitrogen atmosphere. Higher heating value (HHV) was increased from 18.37MJkg⁻¹ to 24.34MJkg⁻¹. The energy to crush a pellet by mechanical compression was determined using a material tester and results showed a rapid decrease before torrefaction temperature reached 250°C. Slightly further decrease was observed when increasing the temperature up to 270°C. The strength loss was confirmed by determining the energy required for grinding the pellet samples in a bench scale disc mill. Particle size distribution measurements after grinding indicated a significant increase of small particles (diameterca. 2mm). To further analyze the effect on strength, the mechanical durability of pellets was tested according to wood pellet standards, EN 15210^-1. The results have shown a good correlation between pellet durability and compression strength, and indicated that the pellet durability can be estimated based on compression strength data of about 25 pellets.</p>

AB - <p>The purpose of the study was to investigate the influence of torrefaction on the quality of Scots pine pellets. Pellet samples were torrefied at 230, 250 and 270°C for 1h in nitrogen atmosphere. Higher heating value (HHV) was increased from 18.37MJkg⁻¹ to 24.34MJkg⁻¹. The energy to crush a pellet by mechanical compression was determined using a material tester and results showed a rapid decrease before torrefaction temperature reached 250°C. Slightly further decrease was observed when increasing the temperature up to 270°C. The strength loss was confirmed by determining the energy required for grinding the pellet samples in a bench scale disc mill. Particle size distribution measurements after grinding indicated a significant increase of small particles (diameterca. 2mm). To further analyze the effect on strength, the mechanical durability of pellets was tested according to wood pellet standards, EN 15210^-1. The results have shown a good correlation between pellet durability and compression strength, and indicated that the pellet durability can be estimated based on compression strength data of about 25 pellets.</p>

KW - Wood pellets

KW - Torrefaction

KW - Durability

KW - Strength

KW - Grinding

U2 - 10.1016/j.fuproc.2012.03.013

DO - 10.1016/j.fuproc.2012.03.013

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

VL - 101

SP - 23

EP - 28

ER -