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Dataset - 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: 0000-0001-6081-5736
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-8372-4386
Responsible organisation
2022 (English)Data set, Primary data
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
2022.
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-88668OAI: oai:DiVA.org:ltu-88668DiVA, id: diva2:1624784
Available from: 2022-01-04 Created: 2022-01-04 Last updated: 2022-01-21

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data set(15441 kB)49 downloadsDescription of content
File information
File name DATASET01.zipFile size 15441 kBChecksum SHA-512Description The zip file contains: 1. pilot scale temperature measurement data 2. TG-DSC data 3. folder containing all the raw data from the TGA.
f798cbddb9ded23e004c1494caddbc8c488f80df5d3289b07f5be2c1f0cd0bb35311de8e14c8a404d0a93a68c119110a58f89612bb781c487ee58ad9023e9c30
Type datasetMimetype application/zip

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Umeki, KentaroPhounglamcheik, Aekjuthon

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Umeki, KentaroPhounglamcheik, Aekjuthon
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Phounglamcheik, A., Johnson, N., Kienzl, N., Strasser, C. & Umeki, K. (2022). Self-Heating of Biochar during Postproduction Storage by O2 Chemisorption at Low Temperatures. Energies, 15(1), Article ID 380.

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CiteExportLink to record
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