University of Oulu

Katja Ohenoja, Mika Körkkö, Valter Wigren, Jan Österbacka, Mirja Illikainen, Fly ash classification efficiency of electrostatic precipitators in fluidized bed combustion of peat, wood, and forest residues, In Journal of Environmental Management, Volume 206, 2018, Pages 607-614, ISSN 0301-4797,

Fly ash classification efficiency of electrostatic precipitators in fluidized bed combustion of peat, wood, and forest residues

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Author: Ohenoja, Katja1; Körkkö, Mika2; Wigren, Valter3;
Organizations: 1Fibre and Particle Engineering, Faculty of Technology, PO Box 4300, 90014, University of Oulu, Finland
2Haarla Oy, Pyhäjärvenkatu 5 A, 33200, Tampere, Finland
3Renotech Oy, Sampsankatu 4B, PO Box 20520, Turku, Finland
4Fortum Waste Solutions Oy, Kuulojankatu 1, PO Box 181, 11101, Riihimäki, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2019-11-10


The increasing use of biomasses in the production of electricity and heat results in an increased amount of burning residue, fly ash which disposal is becoming more and more restricted and expensive. Therefore, there is a great interest in utilizing fly ashes instead of just disposing of it. This study aimed to establish whether the utilization of fly ash from the fluidized bed combustion of peat, wood, and forest residues can be improved by electrostatic precipitator separation of sulfate, chloride, and some detrimental metals. Classification selectivity calculations of electrostatic precipitators for three different fuel mixtures from two different power plants were performed by using Nelson’s and Karnis’s selectivity indices. Results showed that all fly ashes behaved similarly in the electrostatic separation process SiO₂ resulted in coarse fractions with Nelson’s selectivity of 0.2 or more, while sulfate, chloride, and the studied detrimental metals (arsenic, cadmium, and lead) enriched into fine fractions with varying selectivity from 0.2 to 0.65. Overall, the results of this study suggest that it is possible to improve the utilization potential of fly ashes from fluidized bed combustion in concrete, fertilizer, and earth construction applications by using electrostatic precipitators for the fractionating of fly ashes in addition to their initial function of collecting fly ash particles from flue gases. The separation of the finer fractions (ESP 2 and 3) from ESP 1 field fly ash is recommended.

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Series: Journal of environmental management
ISSN: 0301-4797
ISSN-E: 1095-8630
ISSN-L: 0301-4797
Volume: 206
Pages: 607 - 614
DOI: 10.1016/j.jenvman.2017.10.047
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
218 Environmental engineering
Funding: This study was supported by the Finnish Funding Agency for Technology and Innovation and the following Finnish companies: Boliden Harjavalta Oy, Ekokem Oy, Fortum Power and Heat Oy, Helen Oy, Jyväskylän Energia Oy, Kemira Chemicals Oy, Metsä Board Oyj, Napapiirin Energia ja Vesi Oy, Nordkalk Oy Ab, Paroc Group Oy, SSAB Europe Oy, Stora Enso Oyj, UPM-Kymmene Oyj and Valmet Technologies Oy.
Copyright information: © 2017 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license