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Lignin from Bioethanol Production as a Part of a Raw Material Blend of a Metallurgical Coke

Author

Listed:
  • Aki Koskela

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

  • Hannu Suopajärvi

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

  • Olli Mattila

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

  • Juha Uusitalo

    (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

Replacement of part of the coal in the coking blend with lignin would be an attractive solution to reduce greenhouse gas emissions from blast furnace (BF) iron making and for obtaining additional value for lignin utilization. In this research, both non-pyrolyzed and pyrolyzed lignin was used in a powdered form in a coking blend for replacing 5-, 10- and 15 m-% of coal in the raw material bulk. Graphite powder was used as a comparative replacement material for lignin with corresponding replacement ratios. Thermogravimetric analysis was performed for all the raw materials to obtaining valuable data about the raw material behavior in the coking process. In addition, chemical analysis was performed for dried lignin, pyrolyzed lignin and coal that were used in the experiments. Produced bio cokes were tested in a compression strength experiment, in reactivity tests in a simulating blast furnace shaft gas profile and temperature. Also, an image analysis of the porosity and pore shapes was performed with a custom made MatLab-based image analysis software. The tests revealed that the pyrolysis of lignin before the coking process has an increasing impact on the bio coke strength, while the reactivity of the bio-cokes did not significantly change. However, after certain level of lignin addition the effect of lignin pyrolysis before the coking lost its significance. According to results of this research, the structure of bio cokes changes significantly when replacement of coal with lignin in the raw material bulk is at a level of 10 m-% or more, causing less uniform structure thus leading to a less strong structure for bio cokes.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1533-:d:225252
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    References listed on IDEAS

    as
    1. 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.
    2. Robert A. Berner, 2003. "The long-term carbon cycle, fossil fuels and atmospheric composition," Nature, Nature, vol. 426(6964), pages 323-326, November.
    3. 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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    1. Zheng, Kaiyue & Han, Hengda & Hu, Song & Ren, Qiangqiang & Su, Sheng & Wang, Yi & Jiang, Long & Xu, Jun & Li, Hanjian & Tong, Yuxing & Xiang, Jun, 2023. "Upgrading biomass waste to bio-coking coal by pressurized torrefaction: Synergistic effect between corncob and lignin," Energy, Elsevier, vol. 267(C).
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