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Self-Heating of Biochar during Postproduction Storage by O2 Chemisorption at Low Temperatures
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-8372-4386
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
BEST—Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, 8010 Graz, Austria.
BEST—Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, 8010 Graz, Austria.
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2022 (English)In: Energies, E-ISSN 1996-1073, Vol. 15, no 1, article id 380Article in journal (Refereed) Published
Abstract [en]

Biochar is attracting attention as an alternative carbon/fuel source to coal in the process industry and energy sector. However, it is prone to self-heating and often leads to spontaneous ignition and thermal runaway during storage, resulting in production loss and health risks. This study investigates biochar self-heating upon its contact with O2 at low temperatures, i.e., 50–300 °C. First, kinetic parameters of O2 adsorption and CO2 release were measured in a thermogravimetric analyzer using biochar produced from a pilot-scale pyrolysis process. Then, specific heat capacity and heat of reactions were measured in a differential scanning calorimeter. Finally, a one-dimensional transient model was developed to simulate self-heating in containers and gain insight into the influences of major parameters. The model showed a good agreement with experimental measurement in a closed metal container. It was observed that char temperature slowly increased from the initial temperature due to heat released during O2 adsorption. Thermal runaway, i.e., self-ignition, was observed in some cases even at the initial biochar temperature of ca. 200 °C. However, if O2 is not permeable through the container materials, the temperature starts decreasing after the consumption of O2 in the container. The simulation model was also applied to examine important factors related to self-heating. The results suggested that self-heating can be somewhat mitigated by decreasing the void fraction, reducing storage volume, and lowering the initial char temperature. This study demonstrated a robust way to estimate the cooling demands required in the biochar production process.

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 15, no 1, article id 380
Keywords [en]
biochar, self-heating, thermal runaway, O2 chemisorption, large-scale storages, packed-bed simulation
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-88691DOI: 10.3390/en15010380ISI: 000741139200001Scopus ID: 2-s2.0-85122269482OAI: oai:DiVA.org:ltu-88691DiVA, id: diva2:1625967
Note

Validerad;2022;Nivå 2;2022-01-10 (johcin);

Funder: FFG (Austrian Research Promotion Agency) program COMET (Competence Center for Excellent Technolgies) (869341)

Available from: 2022-01-10 Created: 2022-01-10 Last updated: 2023-08-28Bibliographically approved

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Phounglamcheik, AekjuthonUmeki, Kentaro

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Phounglamcheik, AekjuthonJohnson, NilsUmeki, Kentaro
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Energy ScienceDepartment of Engineering Sciences and Mathematics
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Umeki, K. (2022). Dataset - Self-Heating of Biochar during Postproduction Storage by O2 Chemisorption at Low Temperatures.

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