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          <r:AttributeValue>Institutionen för teknikvetenskap och matematik, Luleå University of Technology</r:AttributeValue>
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            <a:FirstGiven>Kentaro</a:FirstGiven>
            <a:LastFamily>Umeki</a:LastFamily>
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              <r:String>Kentaro Umeki</r:String>
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      <r:Title>
        <r:String xml:lang="sv">Dataset - Self-Heating of Biochar during Postproduction Storage by O₂ Chemisorption at Low Temperatures</r:String>
        <r:String xml:lang="en">Dataset - Self-Heating of Biochar during Postproduction Storage by O₂ Chemisorption at Low Temperatures</r:String>
      </r:Title>
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          <r:URN>urn:ddi:se.researchdata:2024-348.Individual-0:2.0</r:URN>
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          <r:String xml:lang="sv">Luleå tekniska universitet</r:String>
          <r:String xml:lang="en">Luleå University of Technology</r:String>
        </r:PublisherName>
      </r:Publisher>
      <r:Publisher>
        <r:PublisherName>
          <r:String xml:lang="sv">Luleå tekniska universitet</r:String>
          <r:String xml:lang="en">Luleå University of Technology</r:String>
        </r:PublisherName>
      </r:Publisher>
      <r:PublicationDate>
        <r:SimpleDate>2022-01-04</r:SimpleDate>
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        <r:IdentifierContent>10.5878/40dp-hx03</r:IdentifierContent>
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      <r:Content xml:lang="sv">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.

Datasetet har ursprungligen publicerats i DiVA och flyttades över till SND 2024.</r:Content>
      <r:Content xml:lang="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.

The dataset was originally published in DiVA and moved to SND in 2024.</r:Content>
    </r:Abstract>
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        <r:URN>urn:ddi:se.researchdata:2024-348.TopicalCoverage:2.0</r:URN>
        <r:Subject xml:lang="en" controlledVocabularyID="20304" controlledVocabularyName="Standard för svensk indelning av forskningsämnen 2025">Energy Engineering</r:Subject>
        <r:Subject xml:lang="sv" controlledVocabularyID="20304" controlledVocabularyName="Standard för svensk indelning av forskningsämnen 2025">Energiteknik</r:Subject>
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