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Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor
Published on: September 9, 2016
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Development of a biomass torrefaction process integrated with oxy-fuel combustion
Khanh-Quang Tran1, Trung Ngoc Trinh1, Quang-Vu Bach1
1Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Bioresource Technology
|September 13, 2015
Summary
Torrefaction of forest residues in carbon dioxide (CO2) yielded less mass but improved energy compared to nitrogen (N2). Adding steam to CO2 enhanced both mass and energy yields, while oxygen (O2) decreased them.
Area of Science:
- Biomass energy conversion
- Thermochemical processing of lignocellulosic materials
Background:
- Oxy-fuel combustion offers advantages for flue gas utilization.
- Torrefaction is a key pretreatment for biomass energy applications.
Purpose of the Study:
- Investigate forest residue torrefaction under oxy-fuel combustion conditions.
- Evaluate the impact of CO2, steam, and O2 on torrefaction yields.
Main Methods:
- Torrefaction experiments conducted using forest residues.
- Atmospheres varied to include N2, CO2, CO2/steam, and CO2/steam/O2 mixtures.
Main Results:
- Torrefaction in CO2 resulted in lower solid mass yield (81.36%) than N2 (83.06%).
- Adding steam to CO2 increased mass yield to 83.30% and energy yield to 88.32%.
- Oxygen addition (5-10% v/v) significantly reduced both mass and energy yields.
Conclusions:
- Steam addition to CO2 is beneficial for torrefaction of forest residues in oxy-fuel combustion.
- Oxygen presence negatively impacts torrefaction efficiency, reducing mass and energy recovery.
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