Abstract

Effect of Temperature, Time, Particle size and Moisture content on Physical and Chemical Properties of Steam Exploded Woody Biomass Effect of Temperature, Time, Particle size and Moisture content on Physical and Chemical Properties of Steam Exploded Woody Biomass The effects of steam explosion processing conditions and feedstock parameters on physical and chemical properties of woody biomass were studied. The moisture contents of treated samples ranged between 14.5% and 32.2% and were higher than the initial moisture content of the untreated samples at 10% and 15%. The solid yield of treated samples varied between 46% and 86%. The mean value for solid yield was significantly (a=0.05) lower for samples treated at 220oC, compared to samples treated at 200oC. The pressure of steam before releasing the samples from high pressure cooking chamber to ambient (i.e. explosion pressure) ranged between 1169.83 – 1316.90 kPa for samples at 200oC and between 1732.86 – 1935.15 kPa for samples treated at 220oC, respectively. The steam pressure at pressure release point were modeled with multilinear regression with time and temperature with R2=0.85. Size reduction effect of steam explosion leading to particle fragmentation was observed. The relative geometric mean diameter of samples ground with 3.175 mm screen size were modeled with R2= 0.87 from the factors temperature, time, and moisture content. Relative bulk densities of steam treated samples ranged from 1.25 to 2.51, and relative tapped bulk densities from 1.12 to 2.23. A multilinear regression model for relative tapped bulk density with R2=0.91 was created from the factors temperature (T), time (t), particle size (p), moisture content (m), and the interaction terms T×p, T×m, and t×p. The lignin content and extractives increased with temperature and time. The lignin content and extractives of samples treated at 220oC were significantly higher than that of samples treated at 200oC. The equilibrium moisture content of treated samples decreased with increasing temperature from moisture sorption test

Published in

Publisher: American Society of Agricultural and Biological Engineers

SLU Authors

• Larsson, Sylvia

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    
  • University of British Columbia

UKÄ Subject classification

Forest Science
Renewable Bioenergy Research


Permanent link to this page (URI)

https://res.slu.se/id/publ/32993