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Study of the transient release of water vapor from a fuel bed of wet biomass in a reciprocating-grate furnace
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
RISE, Sweden;Södra Innovation, Sweden.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.ORCID iD: 0000-0002-8086-1518
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.ORCID iD: 0000-0003-1138-5105
2019 (English)In: Journal of the Energy Institute, ISSN 1743-9671, E-ISSN 1746-0220, Vol. 92, no 4, p. 843-854Article in journal (Refereed) Published
Abstract [en]

The present study investigates how sudden changes in fuel moisture affected the combustion characteristics of the fuel bed in a 4-MW reciprocating-grate furnace. The moisture content of the fuel fed to the furnace was monitored online using a near-infrared spectroscopy device, and the water vapor concentration in the flue gas was measured continuously. To obtain experimental data on fuel-bed conditions, the temperature and gas composition in the bed were measured using a probe. A simplified drying model was developed using the measured gas composition values as inputs. The model was then used to estimate the drying rate and to simulate the extent of the drying zone along the grate. Measurements indicated that a change in the moisture content of the fuel fed to the furnace was detected as a change in water vapor concentration in the flue gas with a delay of about 2 h. The model predicted that a portion of wet fuel would need about 2 h to become dry, in line with the measured time delay of the water vapor concentration change in the flue gas. Overall, there was good alignment between the measured and simulated results, supporting the validity of the model and the assumed mechanisms.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 92, no 4, p. 843-854
National Category
Bioenergy
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:lnu:diva-77594DOI: 10.1016/j.joei.2018.06.014ISI: 000473381000002Scopus ID: 2-s2.0-85053155711OAI: oai:DiVA.org:lnu-77594DiVA, id: diva2:1246057
Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2023-11-14Bibliographically approved

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Razmjoo, NargesMorgalla, MarioStrand, Michael

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