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Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Author

Listed:
  • Hannu Suopajärvi

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

  • Essi Dahl

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

  • Antti Kemppainen

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

  • Stanislav Gornostayev

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

  • Aki Koskela

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

  • Timo Fabritius

    (Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland)

Abstract

The aim of this research was to investigate the effects of charcoal and Kraft-lignin additions on the structure, cold compression strength, and reactivity of bio-cokes produced at the laboratory scale. Bio-cokes were prepared by adding charcoal and Kraft-lignin (2.5, 5.0, 7.5, and 10.0 wt %) to medium-volatile coal and coking the mixture with controlled heating rate (3.5 °C/min) up to 1200 °C. In addition, four particle sizes of charcoal were added with a 5 wt % addition rate to investigate the effect of particle size on the compression strength and reactivity. Thermogravimetric analysis was used to evaluate the pyrolysis behavior of coal and biomasses. Optical microscopy was used to investigate the interaction of coal and biomass components. It was found that by controlling the amount of charcoal and Kraft-lignin in the coal blend, the compression strength of the bio-cokes remains at an acceptable level compared to the reference coke without biomass addition. The cold compression strength of the charcoal bio-cokes was higher compared to Kraft-lignin bio-cokes. The reactivity of the bio-cokes with charcoal addition was markedly higher compared to reference coke and Kraft-lignin bio-cokes, mainly due to the differences in the physical properties of the parental biomass. By increasing the bulk density of the coal/biomass charge, the cold compression strength of the bio-cokes can be improved substantially.

Suggested Citation

  • Hannu Suopajärvi & Essi Dahl & Antti Kemppainen & Stanislav Gornostayev & Aki Koskela & Timo Fabritius, 2017. "Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity," Energies, MDPI, vol. 10(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1850-:d:118578
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    References listed on IDEAS

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    1. Raphael Slade & Ausilio Bauen & Robert Gross, 2014. "Global bioenergy resources," Nature Climate Change, Nature, vol. 4(2), pages 99-105, February.
    2. Suopajärvi, Hannu & Pongrácz, Eva & Fabritius, Timo, 2013. "The potential of using biomass-based reducing agents in the blast furnace: A review of thermochemical conversion technologies and assessments related to sustainability," Renewable and Sustainable Energy Reviews, Elsevier, vol. 25(C), pages 511-528.
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    Cited by:

    1. Suopajärvi, Hannu & Umeki, Kentaro & Mousa, Elsayed & Hedayati, Ali & Romar, Henrik & Kemppainen, Antti & Wang, Chuan & Phounglamcheik, Aekjuthon & Tuomikoski, Sari & Norberg, Nicklas & Andefors, Alf , 2018. "Use of biomass in integrated steelmaking – Status quo, future needs and comparison to other low-CO2 steel production technologies," Applied Energy, Elsevier, vol. 213(C), pages 384-407.
    2. Aki Koskela & Hannu Suopajärvi & Olli Mattila & Juha Uusitalo & Timo Fabritius, 2019. "Lignin from Bioethanol Production as a Part of a Raw Material Blend of a Metallurgical Coke," Energies, MDPI, vol. 12(8), pages 1-19, April.
    3. Surup, Gerrit & Vehus, Tore & Eidem, Per-Anders & Trubetskaya, Anna & Nielsen, Henrik Kofoed, 2019. "Characterization of renewable reductants and charcoal-based pellets for the use in ferroalloy industries," Energy, Elsevier, vol. 167(C), pages 337-345.
    4. Michał Rejdak & Małgorzata Wojtaszek-Kalaitzidi & Grzegorz Gałko & Bartosz Mertas & Tomasz Radko & Robert Baron & Michał Książek & Sten Yngve Larsen & Marcin Sajdak & Stavros Kalaitzidis, 2022. "A Study on Bio-Coke Production—The Influence of Bio-Components Addition on Coke-Making Blend Properties," Energies, MDPI, vol. 15(18), pages 1-27, September.
    5. Toloue Farrokh, Najibeh & Suopajärvi, Hannu & Mattila, Olli & Umeki, Kentaro & Phounglamcheik, Aekjuthon & Romar, Henrik & Sulasalmi, Petri & Fabritius, Timo, 2018. "Slow pyrolysis of by-product lignin from wood-based ethanol production– A detailed analysis of the produced chars," Energy, Elsevier, vol. 164(C), pages 112-123.

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