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Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat

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  • Halina Pawlak–Kruczek

    (Wroclaw University of Science and Technology, Faculty of Mechanical and Power Engineering, Department of Boilers, Combustion and Energy Processes, 59-400 Wrocław, Poland)

  • Michał Czerep

    (Wroclaw University of Science and Technology, Faculty of Mechanical and Power Engineering, Department of Boilers, Combustion and Energy Processes, 59-400 Wrocław, Poland)

  • Lukasz Niedzwiecki

    (Wroclaw University of Science and Technology, Faculty of Mechanical and Power Engineering, Department of Boilers, Combustion and Energy Processes, 59-400 Wrocław, Poland)

  • Emmanouil Karampinis

    (Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute, GR 502 00 Ptolemais, Greece)

  • Ioannis Violidakis

    (Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute, GR 502 00 Ptolemais, Greece)

  • Ioannis Avagianos

    (Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute, GR 502 00 Ptolemais, Greece)

  • Panagiotis Grammelis

    (Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute, GR 502 00 Ptolemais, Greece)

Abstract

An experimental study was carried out for lignites of different places of origin, i.e., Poland, Greece, Romania and Australia, using a toroidal bed dryer. The effect of the temperature on the drying efficiency, including the loss of moisture content over time under fixed drying conditions was the subject of the investigation. The main goal was to confirm the possibility of the use of a toroidal bed as a base for a drying system that could utilize low quality heat from sources such as flue gases from a boiler and determine the optimum parameters for such a system. The conducted study has conclusively proven the feasibility of the use of low temperature heat sources for drying lignite in a toroidal bed. A moisture content of 20% could be achieved for most of the tested lignites, using the toroidal bed, with reasonably short residence times (approx. 30 min) and an air temperature as low as 60 °C. Moreover, the change of the particle size distribution, to some degree, affected the final moisture content due to the entrainment of wet, fine particles. The study also determined that the in-bed attrition of the particles is partially responsible for the generation of fines.

Suggested Citation

  • Halina Pawlak–Kruczek & Michał Czerep & Lukasz Niedzwiecki & Emmanouil Karampinis & Ioannis Violidakis & Ioannis Avagianos & Panagiotis Grammelis, 2019. "Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat," Energies, MDPI, vol. 12(7), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1191-:d:217477
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    References listed on IDEAS

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    1. Heng Chen & Zhen Qi & Qiao Chen & Yunyun Wu & Gang Xu & Yongping Yang, 2018. "Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit," Energies, MDPI, vol. 11(9), pages 1-16, September.
    2. Xu, Cheng & Xu, Gang & Zhao, Shifei & Zhou, Luyao & Yang, Yongping & Zhang, Dongke, 2015. "An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant," Applied Energy, Elsevier, vol. 160(C), pages 882-891.
    3. Anna Sciazko & Yosuke Komatsu & Marcin Zakrzewski & Taro Akiyama & Akira Hashimoto & Naoki Shikazono & Shozo Kaneko & Shinji Kimijima & Janusz S. Szmyd & Yoshinori Kobayashi, 2016. "Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere," Energies, MDPI, vol. 9(5), pages 1-18, May.
    4. Agraniotis, Michalis & Koumanakos, Antonis & Doukelis, Aggelos & Karellas, Sotirios & Kakaras, Emmanuel, 2012. "Investigation of technical and economic aspects of pre-dried lignite utilisation in a modern lignite power plant towards zero CO2 emissions," Energy, Elsevier, vol. 45(1), pages 134-141.
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    Cited by:

    1. Prabhakaran, SP Sathiya & Swaminathan, Ganapathiraman & Joshi, Viraj V., 2022. "Combustion and pyrolysis kinetics of Australian lignite coal and validation by artificial neural networks," Energy, Elsevier, vol. 242(C).
    2. Tadeáš Ochodek & Emmanouil Karampinis & Artur Pozarlik, 2022. "Contemporary Problems in Combustion—Fuels, Their Valorisation, Emissions, Flexibility and Auxiliary Systems," Energies, MDPI, vol. 15(5), pages 1-4, February.

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