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

Halina Pawlak–Kruczek, Michał Czerep, Lukasz Niedzwiecki, Emmanouil Karampinis, Ioannis Violidakis, Ioannis Avagianos and Panagiotis Grammelis
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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

Energies, 2019, vol. 12, issue 7, 1-22

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.

Keywords: drying; lignite; toroidal bed; attrition; energy efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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