skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Demonstration of a Pilot-Scale Plant for Biomass Torrefaction and Briquetting

Abstract

<italic>Abstract.</italic> A semi-mobile torrefaction and densification pilot plant was constructed in order to determine ideal operating conditions and evaluate briquette quality and throughput rate using forest residuals as the input feedstock. Experiments were conducted at various conditions with feedstock moisture content ranging from 4% to 25% (wet basis), reactor residence times of 10 and 20 min, and final product temperatures between 214°C and 324°C. Optimal operating conditions, evaluated based on throughput rate, specific electricity demand, torrefied briquette grindability, briquette volumetric energy density, and briquette durability, were identified to occur with a short residence time (10 min), low feedstock moisture content (<11% wet basis), and high final product temperature between 267°C and 275°C. These conditions were able to process 510 to 680 kg h -1(wet basis) feedstock with a dry mass yield of 79% to 84% to produce torrefied biomass with a higher heating value of 21.2 to 23.0 MJ kg -1(dry basis) compared to 19.6 MJ kg -1for the original biomass. Torrefied briquettes produced at these conditions had a neatly stacked packing density of 990 kg m -3and a volumetric energy density of 21,800 MJ m -3. Their specific grinding energy was an average 37% of the energy required tomore » grind a raw biomass briquette. These torrefied briquettes were more durable (94% DU) than raw briquettes (85% DU) directly following production, but were less durable after undergoing temperature and humidity fluctuations associated with long distance transportation (74% DU for torrefied and 84% DU for raw biomass briquettes). Results from this pilot plant are promising for commercial scale production of high quality torrefied briquettes and should lead to additional research and development of a torrefaction system optimized for a higher throughput rate at these conditions. Keywords: Biomass, Biomass conversion technology, Bioenergy, Briquetting, Densification, Forest residuals, Pyrolysis, Torrefaction.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Humboldt State Univ., Arcata, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1541893
DOE Contract Number:  
EE0006297
Resource Type:
Journal Article
Journal Name:
Applied Engineering in Agriculture
Additional Journal Information:
Journal Volume: 34; Journal Issue: 1; Journal ID: ISSN 1943-7838
Publisher:
American Society of Agricultural and Biological Engineers
Country of Publication:
United States
Language:
English
Subject:
Agriculture

Citation Formats

Severy, Mark A., Chamberlin, Charles E., Eggink, Anthony J., and Jacobson, Arne E. Demonstration of a Pilot-Scale Plant for Biomass Torrefaction and Briquetting. United States: N. p., 2018. Web. doi:10.13031/aea.12376.
Severy, Mark A., Chamberlin, Charles E., Eggink, Anthony J., & Jacobson, Arne E. Demonstration of a Pilot-Scale Plant for Biomass Torrefaction and Briquetting. United States. doi:10.13031/aea.12376.
Severy, Mark A., Chamberlin, Charles E., Eggink, Anthony J., and Jacobson, Arne E. Mon . "Demonstration of a Pilot-Scale Plant for Biomass Torrefaction and Briquetting". United States. doi:10.13031/aea.12376.
@article{osti_1541893,
title = {Demonstration of a Pilot-Scale Plant for Biomass Torrefaction and Briquetting},
author = {Severy, Mark A. and Chamberlin, Charles E. and Eggink, Anthony J. and Jacobson, Arne E.},
abstractNote = {<italic>Abstract.</italic> A semi-mobile torrefaction and densification pilot plant was constructed in order to determine ideal operating conditions and evaluate briquette quality and throughput rate using forest residuals as the input feedstock. Experiments were conducted at various conditions with feedstock moisture content ranging from 4% to 25% (wet basis), reactor residence times of 10 and 20 min, and final product temperatures between 214°C and 324°C. Optimal operating conditions, evaluated based on throughput rate, specific electricity demand, torrefied briquette grindability, briquette volumetric energy density, and briquette durability, were identified to occur with a short residence time (10 min), low feedstock moisture content (<11% wet basis), and high final product temperature between 267°C and 275°C. These conditions were able to process 510 to 680 kg h-1(wet basis) feedstock with a dry mass yield of 79% to 84% to produce torrefied biomass with a higher heating value of 21.2 to 23.0 MJ kg-1(dry basis) compared to 19.6 MJ kg-1for the original biomass. Torrefied briquettes produced at these conditions had a neatly stacked packing density of 990 kg m-3and a volumetric energy density of 21,800 MJ m-3. Their specific grinding energy was an average 37% of the energy required to grind a raw biomass briquette. These torrefied briquettes were more durable (94% DU) than raw briquettes (85% DU) directly following production, but were less durable after undergoing temperature and humidity fluctuations associated with long distance transportation (74% DU for torrefied and 84% DU for raw biomass briquettes). Results from this pilot plant are promising for commercial scale production of high quality torrefied briquettes and should lead to additional research and development of a torrefaction system optimized for a higher throughput rate at these conditions. Keywords: Biomass, Biomass conversion technology, Bioenergy, Briquetting, Densification, Forest residuals, Pyrolysis, Torrefaction.},
doi = {10.13031/aea.12376},
journal = {Applied Engineering in Agriculture},
issn = {1943-7838},
number = 1,
volume = 34,
place = {United States},
year = {2018},
month = {1}
}