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Title: Impact of process conditions on the density and durability of wheat, oat, canola, and barley straw briquettes

The present study is to understand the impact of process conditions on the quality attributes of wheat oat, barley, and canola straw briquettes. Analysis of variance indicated that briquette moisture content and initial density immediately after compaction and final density after 2 weeks of storage are strong functions of feedstock moisture content and compression pressure, whereas durability rating is influenced by die temperature and feedstock moisture content. Briquettes produced at a low feedstock moisture content of 9 % (w.b.) yielded maximum densities >700 kg/m3 for wheat, oat, canola, and barley straws. Lower feedstock moisture content of <10 % (w.b.) and higher die temperatures >110 °C and compression pressure >10 MPa minimized the briquette moisture content and maximized densities and durability rating based on surface plots observations. Optimal process conditions indicated that a low feedstock moisture content of about 9 % (w.b.), high die temperature of 120–130 °C, medium-to-large hammer mill screen sizes of about 24 to 31.75 mm, and low to high compression pressures of 7.5 to 12.5 MPa minimized briquette moisture content to <8 % (w.b.) and maximized density to >700 kg/m3. Durability rating >90 % is achievable at higher die temperatures of >123 °C, lower to medium feedstockmore » moisture contents of 9 to 12 % (w.b.), low to high compression pressures of 7.5 to 12.5 MPa, and large hammer mill screen size of 31.75 mm, except for canola where a lower compression pressure of 7.5 to 8.5 MPa and a smaller hammer mill screen size of 19 mm for oat maximized the durability rating values.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States). Biofuels and Renewable Energy Technologies Dept., Energy Systems and Technology Div.
  2. Univ. of Saskatchewan, Saskatoon, SK (Canada). Dept. of Chemical and Biological Engineering
  3. Shenyang Agricultural Univ. (China). College of Engineering
Publication Date:
OSTI Identifier:
1177670
Report Number(s):
INL/JOU--15-34237
Journal ID: ISSN 1939-1234; PII: 9527
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
BioEnergy Research
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 1939-1234
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS Agricultural Straws; Briquettes; Unit Density