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An "In-Situ Binding" Approach to Produce Torrefied Biomass Briquettes.

Osama Bu Aamiri¹, Rajeeva Thilakaratne², Jaya Shankar Tumuluru³

¹Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY 40292, USA. Osama.Buaamiri@louisville.edu.

Bioengineering (Basel, Switzerland)

|September 25, 2019

Summary

Biomass-derived coal (biocoal) faces handling challenges due to low density. This study introduces a novel method using lightly torrefied material (LTM) as an in-situ binder to improve biocoal briquette density and durability.

Keywords:

binding biomass briquetting durability highly and lightly torrefied materials hydrophobicity lignin moisture

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Area of Science:

Biomass energy conversion
Materials science
Sustainable fuels

Background:

Biocoal offers a carbon-neutral alternative to coal for power generation.
Torrefaction enhances biocoal's carbon content but reduces density, causing handling issues.
Densification into briquettes is needed, but torrefied biomass is hard to bind without expensive or incompatible binders.

Purpose of the Study:

To investigate the use of lightly torrefied material (LTM) as an in-situ binder for biocoal densification.
To overcome the challenges of binding torrefied biomass without external additives.
To improve the density, durability, and handling properties of biocoal briquettes.

Main Methods:

Lignin mobilization within biomass during torrefaction was studied.
A pilot-scale briquetter was used to densify torrefied biomass mixed with LTM.
Optimal moisture (10-11%) and temperature conditions for binding were determined.

Main Results:

LTM effectively mobilized in-situ lignin to act as a binder during briquetting.
Briquettes produced with LTM showed improved density and durability.
The resulting biocoal briquettes were hydrophobic, enhancing their suitability for storage and transport.

Conclusions:

Lightly torrefied material (LTM) is a cost-effective, in-situ binder for biocoal.
This method addresses the density and handling challenges of torrefied biomass.
The developed briquetting process yields durable, hydrophobic biocoal suitable for power generation.