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Title: Comparative net energy ratio analysis of pellet produced from steam pretreated biomass from agricultural residues and energy crops

Here, a process model was developed to determine the net energy ratio (NER) for production of pellets from steam pretreated agricultural residue (AR) and energy crop (i.e. switchgrass in this case). The NER is a ratio of the net energy output to the total net energy input from non-renewable energy sources into a system. Scenarios were developed to measure the effects of temperature and level of steam pretreatment on the NER of steam pretreated AR- and switch grass-based pellets. The NER for the base case at 6 kg h-1 is 1.76 and 1.37 for steam-pretreated AR- and switchgrass-based pellets, respectively. The reason behind the difference is that more energy is required to dry switchgrass pellets than AR pellets. The sensitivity analysis for the model shows that the optimum temperature for steam pretreatment is 160 C with 50% pretreatment (half the feedstock is pretreated, while the rest is undergoes regular pelletization). The uncertainty results for NER for steam pretreated AR and switch grass pellets are 1.62 ± 0.10 and 1.42 ± 0.11, respectively.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3]
  1. Univ. of Alberta, Edmonton, AB (Canada)
  2. Univ. of British Columbia, Vancouver, BC (Canada)
  3. Univ. of British Columbia, Vancouver, BC (Canada); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Biomass and Bioenergy
Additional Journal Information:
Journal Volume: 90; Journal Issue: C; Journal ID: ISSN 0961-9534
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; agricultural residue; energy crop; pelletization; process model; steam pretreatment
OSTI Identifier:
1328344