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Title: Steam explosion of oil palm residues for the production of durable pellets

Here we investigated the effect of steam explosion pretreatment on the physical and mechanical properties of the pellets made from empty fruit bunch (EFB) and palm kernel shell (PKS) and we compared to that of softwood Douglas fir (DF). We found that the high heating value of the empty fruit bunch was increased by 21% after steam explosion pretreatment. The pellet density of EFB and Douglas fir pellets did not change while the pellet density of PKS increased from 1.13 to 1.21 g/cm3 after steam explosion. That may be attributed to the rapid volatilization of high mass fraction extractives during high pressure steaming and lead to the shrinkage of micropores of the PKS fibers. The maximum brealdng strength of steam exploded EFB and PKS were increased by 63% and 45%, respectively. The required compaction energy for the steam exploded EFB pellet is 44.50 J/g while that of the untreated EFB pellet is 30.15 J/g. Similar to Douglas fir, the required extrusion energy for the steam exploded EFB pellet was about 6 times than that of the untreated EFB pellet. The increased extrusion energy is mainly contributed by the increase in mono-saccharides by auto-hydrolysis during steam explosion pretreatment.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [4] ;  [5] ;  [4]
  1. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemical and Biological Engineering
  2. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemical and Biological Engineering
  3. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemical and Biological Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Science Division
  4. Queen's Univ., Kingston, ON (Canada). Queen's Inst. for Energy and Environmental Policy; TorchLight Bioresources Inc., Toronto, ON (Canada)
  5. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Wood Science; TorchLight Bioresources Inc., Toronto, ON (Canada)
Publication Date:
OSTI Identifier:
1328297
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 141; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
Natural Sciences and Engineering Research Council of Canada; TorchLight Bioresources Inc.; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 09 BIOMASS FUELS Empty fruit bunch; Palm kernel shell; Pellet; Density; Compression energy; Steam explosion