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Particulate emissions measurements by laser-based techniques in a boiler fueled by wood pellets

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Abstract

This paper describes mainly laser-based techniques applied to a boiler fueled by wood pellets which is a real complicated combustion system. To our knowledge, laser-induced incandescence (LII) and extinction are used to characterize particulate emission at the exhaust for the first time because laser diagnostics are generally applied to laboratory flames, automotive engines and aeroengines. The 30-kW boiler was first characterized by temperature mapping in the combustion chamber and particle diameter analysis by scanning mobility particle sizer at the exhaust and inside the first combustion chamber for a better understanding of the running of this complex combustion system. Non-intrusive laser-based diagnostics including broadband LII, two-color LII and laser extinction excited at 1064 nm have been employed to study the particulate emissions at the exhaust of the boiler during the start-up and the steady-state phases of the boiler. The cross analysis of the experimental results obtained with the different diagnostics shows that particle size distributions, particles volume fractions and the temperature distribution are strongly dependent on the boiler cycle linked to the pellets loading. Laser extinction and LII-based methods provided complementary information about the particulate emissions. The LII technique probes incandescent soot particles formed during the combustion of pellets, while laser extinction detects both soot and non-incandescent particles (such as dust, fly ashes).

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Acknowledgements

This work was supported by several funding sources: the Région Hauts-de-France, in the framework of the regional project SYLWATT and in partnership with LAMIH (UPHF, Valenciennes), PC2A (Lille), CCM (ULCO, Dunkerque) and Enerbiom; the company Enerbiom and the ANRT (National Association of Research and Technology) for the Ph.D. Grant awarded to Ms. Creyx; the Région Hauts-de-France for the post-doctoral grant awarded to Ms. Bejaoui.

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Authors and Affiliations

  1. Faculté des Sciences et Technologies, Université de Lille, 59655, Villeneuve d’Ascq, France

    Salma Bejaoui & Eric Therssen

  2. Univ. Polytechnique Hauts-de-France, CNRS, UMR 8201-LAMIH, 59313, Valenciennes, France

    Marie Creyx, Eric Delacourt & Céline Morin

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  1. Salma Bejaoui
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  2. Marie Creyx
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  3. Eric Delacourt
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  4. Céline Morin
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  5. Eric Therssen
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Correspondence to Eric Therssen.

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This article is part of topical collection of on Laser-Induced Incandescence (Klaus Peter Geigle and Stefan Will).

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Bejaoui, S., Creyx, M., Delacourt, E. et al. Particulate emissions measurements by laser-based techniques in a boiler fueled by wood pellets. Appl. Phys. B 126, 6 (2020). https://doi.org/10.1007/s00340-019-7350-5

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