Development and validation of predictive relationships between mechanical properties of ground willow and pellet quality

Apoorva Karamchandani, Hojae Yi, Virendra Puri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Willow is a light-weight and uniform-grained hardwood, which is common to the Northeast U.S. Unlike other hardwood such as oak, beech, and cherry, willow is a short rotation crop. It has the ability to resprout after multiple cuts, and has tolerance of dense planting. Therefore, willow is gaining popularity as a biomass. In this study, willow was ground and pelletized. Physical and mechanical properties of ground willow and quality of willow pellets were determined. Size reduction was performed with two different screen sizes (3.175 mm and 6.35 mm) and conditioned to obtain biomass at two different moisture contents (17.5% and 20% on wet basis). Determined physical properties of ground willow include bulk density, particle density, and particle size distribution. D50 of willow ground with 6.35 mm screen size was higher by 33.7% than D50 of willow ground with 3.175 mm screen. To determine mechanical properties of ground willow, hydrostatic triaxial compression (HTC) tests were performed using the Cubical Triaxial Tester (CTT). Bulk modulus, compression index, and spring-back index of ground willow for four different conditions at four unloading pressures were determined. Durability, pellet density, axial compressive strength, and diametral tensile strength were the indicators of pellet quality. Pellets formed with the larger screen size, 6.350 mm, at 17.5% (w.b.) moisture content has highest axial and diametral tensile strengths among all four conditions. Compression index was found most suitable for predicting diametral tensile strength and axial compressive strength for willow pellets.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014
PublisherAmerican Society of Agricultural and Biological Engineers
Pages732-735
Number of pages4
ISBN (Electronic)9781632668455
StatePublished - Jan 1 2014
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014 - Montreal, Canada
Duration: Jul 13 2014Jul 16 2014

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014
Volume1

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014
CountryCanada
CityMontreal
Period7/13/147/16/14

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)
  • Mechanical Engineering

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