dc.contributor.author | García Llamas, Ángel David | |
dc.contributor.author | Guo, Ning | |
dc.contributor.author | Li, Tian | |
dc.contributor.author | Gebart, Rikard | |
dc.contributor.author | Umeki, Kentaro | |
dc.date.accessioned | 2022-01-18T11:06:32Z | |
dc.date.available | 2022-01-18T11:06:32Z | |
dc.date.created | 2022-01-10T11:40:06Z | |
dc.date.issued | 2021 | |
dc.identifier.citation | Combustion and Flame. 2022, 238, . | en_US |
dc.identifier.issn | 0010-2180 | |
dc.identifier.uri | https://hdl.handle.net/11250/2837896 | |
dc.description.abstract | Our earlier study showed significant differences in average particle velocity between simulation and experimental results for devolatilizing biomass particles in an idealised entrained flow reactor [N. Guo et al., Fuel, 2020]. This indicates that the simulations do not accurately describe the physicochemical transformations and fluid dynamic processes during devolatilization. This article investigates the reasons for these discrepancies using time-resolved analyses of the experimental data and complementary modelling work. The experiments were conducted in a downdraft drop-tube furnace with optical access, which uses a fuel-rich flat flame (CH4single bondO2single bondCO2) to heat the particles. Gas flow was characterized using particle image velocimetry, equilibrium calculations and thermocouple measurements. High-speed images of devolatilizing Norway spruce (Picea Abies) particles were captured and analysed using time-resolved particle tracking velocimetry methods. The data were used to estimate the balance of forces and fuel conversion. Thrust and “rocket-like” motions were frequently observed, followed by quick entrainment in the gas flow. Rocketing particles were, on average, smaller, more spherical and converted faster than their non-rocketing counterparts. These differences in conversion behaviour could be captured by a particle-size dependent, 0-D devolatilization model, corrected for non-isothermal effects. The results from this investigation can provide a basis for future modelling and simulation work relevant for pulverized firing technologies. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier Ltd. | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Rapid change of particle velocity due to volatile gas release during biomass devolatilization | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.source.volume | 238 | en_US |
dc.source.journal | Combustion and Flame | en_US |
dc.identifier.doi | 10.1016/j.combustflame.2021.111898 | |
dc.identifier.cristin | 1977390 | |
dc.relation.project | Norges forskningsråd: 267916 | en_US |
dc.source.articlenumber | 111898 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |