Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 16, 7485-7496, 2016
http://www.atmos-chem-phys.net/16/7485/2016/
doi:10.5194/acp-16-7485-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Jun 2016
New particle formation in the fresh flue-gas plume from a coal-fired power plant: effect of flue-gas cleaning
Fanni Mylläri1, Eija Asmi2, Tatu Anttila1, Erkka Saukko1, Ville Vakkari2, Liisa Pirjola3, Risto Hillamo2, Tuomas Laurila2, Anna Häyrinen4, Jani Rautiainen4, Heikki Lihavainen2, Ewan O'Connor2, Ville Niemelä5, Jorma Keskinen1, Miikka Dal Maso1, and Topi Rönkkö1 1Department of Physics, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland
2Atmospheric Composition Research, Finnish Meteorological Institute, 00560, Helsinki, Finland
3Department of Technology, Metropolia University of Applied Sciences, 00180, Helsinki, Finland
4Helen Oy, 00090 Helen, Helsinki, Finland
5Dekati Ltd., Tykkitie 1, 36240 Kangasala, Finland
Abstract. Atmospheric emissions, including particle number and size distribution, from a 726 MWth coal-fired power plant were studied experimentally from a power plant stack and flue-gas plume dispersing in the atmosphere. Experiments were conducted under two different flue-gas cleaning conditions. The results were utilized in a plume dispersion and dilution model taking into account particle formation precursor (H2SO4 resulted from the oxidation of emitted SO2) and assessment related to nucleation rates. The experiments showed that the primary emissions of particles and SO2 were effectively reduced by flue-gas desulfurization and fabric filters, especially the emissions of particles smaller than 200 nm in diameter. Primary pollutant concentrations reached background levels in 200–300 s. However, the atmospheric measurements indicated that new particles larger than 2.5 nm are formed in the flue-gas plume, even in the very early phases of atmospheric ageing. The effective number emission of nucleated particles were several orders of magnitude higher than the primary particle emission. Modelling studies indicate that regardless of continuing dilution of the flue gas, nucleation precursor (H2SO4 from SO2 oxidation) concentrations remain relatively constant. In addition, results indicate that flue-gas nucleation is more efficient than predicted by atmospheric aerosol modelling. In particular, the observation of the new particle formation with rather low flue-gas SO2 concentrations changes the current understanding of the air quality effects of coal combustion. The results can be used to evaluate optimal ways to achieve better air quality, particularly in polluted areas like India and China.

Citation: Mylläri, F., Asmi, E., Anttila, T., Saukko, E., Vakkari, V., Pirjola, L., Hillamo, R., Laurila, T., Häyrinen, A., Rautiainen, J., Lihavainen, H., O'Connor, E., Niemelä, V., Keskinen, J., Dal Maso, M., and Rönkkö, T.: New particle formation in the fresh flue-gas plume from a coal-fired power plant: effect of flue-gas cleaning, Atmos. Chem. Phys., 16, 7485-7496, doi:10.5194/acp-16-7485-2016, 2016.
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Short summary
The primary emissions of a coal-fired power plant were highly affected by the flue-gas cleaning technologies. The primary emission results were used as input values for a Gaussian plume model and the model correlated well with the atmospheric measurements from the flue-gas plume. Concentrations of newly formed particles in the flue gas plume were higher than the primary particle concentration, and thus the source of particle-forming precursors should be characterized in more detail.
The primary emissions of a coal-fired power plant were highly affected by the flue-gas cleaning...
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