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Bed cooling effects in solid particulate matter emissions during biomass combustion. A morphological insight

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  • Pérez-Orozco, Raquel
  • Patiño, David
  • Porteiro, Jacobo
  • Míguez, José Luis

Abstract

Considering recent environmental regulations, the need to adapt domestic biomass combustion systems to models that generate less emissions has gained relative importance. The present research proposes an analysis of the bed cooling effects on emission patterns, specifically focusing on the concentration, typology and morphological aspects of the released particles. The study was carried out by comparing the behaviour of a small-scale pilot plant with air stratification, with and without bed cooling. The results revealed an optimal behaviour of the facility with distributions of 30% primary-70% secondary air, accompanied by a significant decrease in emissions due to the reduction in the operating temperatures. More than 75% of the particles were retained in the bed on the cooled surfaces due to the effect of the prominent temperature gradient that was produced. Among the types of emitted particles (mostly with sizes below 0.1 μm), the presence of partial biomass degradation remnants was observed, representing three-quarters of the total collected matter. To a lesser extent, the presence of carbonaceous agglomerates was detected and usually in very compact clusters; however, in cases of high primary air supply, large amounts of immature soot were observed.

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  • Pérez-Orozco, Raquel & Patiño, David & Porteiro, Jacobo & Míguez, José Luis, 2020. "Bed cooling effects in solid particulate matter emissions during biomass combustion. A morphological insight," Energy, Elsevier, vol. 205(C).
    • Handle: RePEc:eee:energy:v:205:y:2020:i:c:s0360544220311956
    DOI: 10.1016/j.energy.2020.118088
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    3. Liu, Zhuo & Li, Jianbo & Long, Xiaofei & Lu, Xiaofeng, 2022. "Mechanisms and characteristics of ash layer formation on bed particles during circulating fluidized bed combustion of Zhundong lignite," Energy, Elsevier, vol. 245(C).
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    5. Natalia Cid & Juan Jesús Rico & Raquel Pérez-Orozco & Ana Larrañaga, 2021. "Experimental Study of the Performance of a Laboratory-Scale ESP with Biomass Combustion: Discharge Electrode Disposition, Dynamic Control Unit and Aging Effect," Sustainability, MDPI, vol. 13(18), pages 1-12, September.

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