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Effect of wood biomass components on self-heating
Nozomi Miyawaki1, Takashi Fukushima1, Takafumi Mizuno1
1Graduate School of Bioresources, Mie University, 1577 Kurimamachiyacho, Tsu, Mie, 514-8507, Japan.
Bioresources and Bioprocessing
|April 23, 2024
Summary
Controlling biomass self-heating through inorganic substance removal, particularly potassium, enables cost-effective biochar production. Optimal moisture content is key for stable self-heating behavior in biomass torrefaction.
Area of Science:
- Biomass energy conversion
- Thermochemical processing of biomass
- Biochar production
Background:
- Biomass spontaneous ignition results from biological and chemical oxidation.
- Controlled spontaneous ignition could lower biochar production costs by eliminating external heat sources.
Purpose of the Study:
- Investigate the control of biomass self-heating using sawdust and bark chips.
- Determine the influence of inorganic substances and moisture content on self-heating behavior.
Main Methods:
- Controlled torrefaction experiments using sawdust and bark chips.
- Analysis of ash and inorganic element content (ICP-OES) before and after water washing.
- Investigation of moisture content effects on self-heating reactivity.
Main Results:
- Bark chips reached torrefaction temperatures due to self-heating.
- Washing to remove inorganic substances suppressed self-heating.
- Potassium was identified as a key inorganic element influencing self-heating.
- A moisture content of 40%w.b. demonstrated steady self-heating behavior.
Conclusions:
- Inorganic substances, especially potassium, play a significant role in biomass self-heating.
- Washing biomass to reduce inorganic content can control self-heating.
- Optimizing moisture content is crucial for achieving stable and predictable self-heating during biochar production.
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