Self-Heating of Biochar during Postproduction Storage by O 2 Chemisorption at Low Temperatures

Aekjuthon Phounglamcheik, Nils Johnson, Norbert Kienzl, Christoph Strasser and Kentaro Umeki
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Aekjuthon Phounglamcheik: Division of Energy Science, Luleå University of Technology, 971 87 Lulea, Sweden
Nils Johnson: Division of Energy Science, Luleå University of Technology, 971 87 Lulea, Sweden
Norbert Kienzl: BEST—Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, 8010 Graz, Austria
Christoph Strasser: BEST—Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, 8010 Graz, Austria
Kentaro Umeki: Division of Energy Science, Luleå University of Technology, 971 87 Lulea, Sweden

Energies, 2022, vol. 15, issue 1, 1-16

Abstract: 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 O 2 at low temperatures, i.e., 50–300 °C. First, kinetic parameters of O 2 adsorption and CO 2 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 O 2 adsorption. Thermal runaway, i.e., self-ignition, was observed in some cases even at the initial biochar temperature of ca. 200 °C. However, if O 2 is not permeable through the container materials, the temperature starts decreasing after the consumption of O 2 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.

Keywords: biochar; self-heating; thermal runaway; O 2 chemisorption; large-scale storages; packed-bed simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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