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Dal Belo Takehara, MarceloORCID iD iconorcid.org/0000-0003-1250-9683
Publications (4 of 4) Show all publications
Dal Belo Takehara, M., Umeki, K. & Gebart, R. (2024). Investigation of oxygen-enriched biomass flames in a lab-scale entrained flow reactor. Fuel, 366, Article ID 131343.
Open this publication in new window or tab >>Investigation of oxygen-enriched biomass flames in a lab-scale entrained flow reactor
2024 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 366, article id 131343Article in journal (Refereed) Published
Abstract [en]

Oxygen-enriched air combustion of pulverized biomass fuel is an effective method to improve char combustion and improve flame stability. Moreover, understanding the impact of O2 addition is an important step toward oxyfuel combustion, one of the most promising technologies for bioenergy with carbon capture and storage (BECCS). Our previous studies focused on flow manipulation methods, e.g., swirling co-flow and acoustic forcing, to enhance particle dispersion during biomass combustion and gasification. This work aims to extend the understanding of the effect of different manipulation methods on oxygen-enriched combustion at different levels in a lab-scale entrained flow reactor. This methodology combines the analysis of visible flame characteristics, CO and NO gas emissions, and coarse particle emissions characterization with thermogravimetric analysis and particle size distribution by dynamic imaging. The results indicated that oxygen-enriched combustion leads to lower liftoff distance and higher flame brightness. Moreover, oxygen-enriched combustion presented coarse particle emissions with finer particle size distribution and lower carbon content. The acoustic forcing further decreased the flame liftoff and decreased CO emissions, increasing combustion efficiency under conditions with similar equivalence ratios and lower momentum flux at the secondary air.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Pulverized fuel, Biomass, Acoustic excitation, Oxygen-enrichment, Combustion
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-104555 (URN)10.1016/j.fuel.2024.131343 (DOI)2-s2.0-85186518924 (Scopus ID)
Funder
Swedish Energy Agency, 47485-1The Kempe Foundations, SMK-1632
Note

Validerad;2024;Nivå 2;2024-04-02 (joosat);

Full text: CC BY License

Available from: 2024-03-12 Created: 2024-03-12 Last updated: 2024-04-02Bibliographically approved
Purnomo, V., Dal Belo Takehara, M., Faust, R., Ejjeta, L. A. & Leion, H. (2024). New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states. Particuology, 90, 493-503
Open this publication in new window or tab >>New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states
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2024 (English)In: Particuology, ISSN 1674-2001, E-ISSN 2210-4291, Vol. 90, p. 493-503Article in journal (Refereed) Published
Abstract [en]

One of the crucial issues in the chemical looping technology lies in its bed material: the oxygen carrier. Particle size analysis of an oxygen carrier is important since in a fluidized bed the material can only work well within a specific size range. While the favorable size ranges for oxygen carrier materials have already been reported, none of the published studies has analyzed the particle size and shape of oxygen carriers in detail. Furthermore, the effect of oxygen carriers' oxidation degree on such properties has not been considered either. This study aimed to report the particle size and shape analysis of five iron-based oxygen carriers, one natural ore, one synthetic material, and three residue products, at different oxidation degrees using dynamic image analysis (DIA). The oxygen carriers were prepared at different mass conversion degrees in a fluidized bed batch reactor. The size distribution, sphericity, and aspect ratio of the oxygen carrier particles were examined experimentally using a Camsizer instrument. Our results show that the DIA method was successfully able to analyze the particle size and shape of our oxygen carriers with satisfying accuracy for comparison. The oxidation state of the investigated materials seems to only affect the particle size and shape of oxygen carriers to a minor extent. However, exposures to redox cycles in a fluidized bed reactor may alter the particle size and shape of most oxygen carriers.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Oxygen carrier, Size and shape analysis, Dynamic image analysis, Oxidation state, Fluidized bed, Chemical looping
National Category
Chemical Process Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-104281 (URN)10.1016/j.partic.2024.01.010 (DOI)
Projects
EU CLARA (Chemical Looping Gasification for Sustainable Production of Biofuels)
Funder
EU, Horizon 2020, 817841Swedish Energy Agency, 51430-1
Note

Validerad;2024;Nivå 2;2024-04-02 (signyg);

Funder: Stiftelsen ÅForsk (No: 20-269);

Full text license: CC-BY

Available from: 2024-02-14 Created: 2024-02-14 Last updated: 2024-04-02Bibliographically approved
Dal Belo Takehara, M. (2022). Experimental analysis of a pulverized biomass-fired entrained flow reactor under imposed acoustic oscillations. (Licentiate dissertation). Luleå: Luleå University of Technology
Open this publication in new window or tab >>Experimental analysis of a pulverized biomass-fired entrained flow reactor under imposed acoustic oscillations
2022 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2022
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-90097 (URN)978-91-8048-065-9 (ISBN)978-91-8048-066-6 (ISBN)
Presentation
2022-06-02, E231, Luleå Tekniska Universitet, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2022-04-13 Created: 2022-04-12 Last updated: 2023-09-05Bibliographically approved
Dal Belo Takehara, M., Chishty, M. A., Umeki, K. & Gebart, R. (2022). Pulverized biomass flame under imposed acoustic oscillations: Flame morphology and emission characteristics. Fuel processing technology, 238, Article ID 107484.
Open this publication in new window or tab >>Pulverized biomass flame under imposed acoustic oscillations: Flame morphology and emission characteristics
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
Keywords
Pulverized solid biomass, Acoustic excitation, Swirl stabilized burner, Particle-laden flow, Flame
National Category
Other Mechanical Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-93053 (URN)10.1016/j.fuproc.2022.107484 (DOI)000893047000004 ()2-s2.0-85138799832 (Scopus ID)
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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ORCID iD: ORCID iD iconorcid.org/0000-0003-1250-9683

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