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Pulverized biomass flame under imposed acoustic oscillations: Flame morphology and emission characteristics
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0003-1250-9683
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0308-3871
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-6081-5736
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-6958-5508
2022 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 238, article id 107484Article in journal (Refereed) Published
Abstract [en]

Forced intermittent combustion with periodical variations of pressure, velocity, and air-fuel ratios is a promising method to increase efficiency and reduce emissions from combustion and gasification applications. In this work, flame characteristics and emissions from a pulverized biomass burner are investigated under oscillations induced by an acoustically-driven synthetic jet. Instantaneous images of incandescent light emitted from flame were captured using high-speed cameras. The images were analyzed to identify the liftoff distance, flame length, and shape. The flame liftoff distance decreased under excited conditions, notably at high forcing amplitude applied to small particle size distribution (63-112 μm). In such conditions, acoustic forcing increases particle dispersion as presented in the previous work, providing conditions for earlier ignition due to enhanced fuel-air mixing besides reducing CO emissions. Flue gas emissions were influenced mainly by the particle size distribution, from which the 63-112 μm particle size presented the lowest values of CO and highest levels of NO emissions. The results presented stable flame edge positions for the particle size of 63-112 μm, while wide range particle distributions (0–600, 0-400 μm) had strong fluctuations, indicating high flame instability. The experimental work adds new insights regarding acoustic excitation in swirl burners, which could be used to optimize pulverized fuel combustion.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 238, article id 107484
Keywords [en]
Pulverized solid biomass, Acoustic excitation, Swirl stabilized burner, Particle-laden flow, Flame
National Category
Other Mechanical Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-93053DOI: 10.1016/j.fuproc.2022.107484ISI: 000893047000004Scopus ID: 2-s2.0-85138799832OAI: oai:DiVA.org:ltu-93053DiVA, id: diva2:1696141
Funder
Swedish Energy Agency, 47485-1The Kempe Foundations, SMK-1632
Note

Validerad;2022;Nivå 2;2022-09-15 (joosat);

Available from: 2022-09-15 Created: 2022-09-15 Last updated: 2023-09-05Bibliographically approved

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Dal Belo Takehara, MarceloChishty, Muhammad AqibUmeki, KentaroGebart, Rikard

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