000151392 001__ 151392
000151392 005__ 20250307114716.0
000151392 0247_ $$2doi$$a10.1016/j.fuel.2025.134668
000151392 0248_ $$2sideral$$a143097
000151392 037__ $$aART-2025-143097
000151392 041__ $$aeng
000151392 100__ $$aJiménez, S.
000151392 245__ $$aDetailed physicochemical evolution of iron particles burnt under controlled, realistic conditions
000151392 260__ $$c2025
000151392 5060_ $$aAccess copy available to the general public$$fUnrestricted
000151392 5203_ $$aThe combustion of pulverized iron has been studied experimentally in a flat flame reactor in a variety of conditions (high gas temperature, constant [O2] within 4.1–16 %, 75–90 µm). Particle temperature profiles were measured in situ. Samples were collected through rapid cooling in N2 at different residence times in these conditions, resulting in a very detailed characterization of their evolution in terms of internal structure, composition, size and mass. For the latter, a thermogravimetric method has been developed in order to determine the oxidation degree, i.e. the fraction of oxygen in each sample, with considerable advantages over e.g. X-ray diffraction. These new curves for mass vs. distance travelled (as well as the temperature profiles) show a clear gradation with [O2], highlighting iron may indeed be seen as a ‘regular’ fuel and pointing to existing technologies for controlling its oxidation rate and temperature in a potential industrial facility. SEM and XRD give sound evidence for the existence of successive stages in the oxidation process, namely Fe → FeO → Fe3O4 → Fe2O3, with no overlapping between them. In the step Fe → FeO, two clear phases are observed, with a receding iron core surrounded by iron oxide and spontaneous emulsification of both phases. The particles steadily grow when they get oxidized. Statistically significant voids appear in the last stages of oxidation; some particles nearly double their size in these stages. At least two types of particle breakup were observed, but none of them affected noticeably the particle size distribution.
000151392 536__ $$9info:eu-repo/grantAgreement/ES/AEI/PID2022-141372OB-I00
000151392 540__ $$9info:eu-repo/semantics/embargoedAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000151392 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000151392 700__ $$aMayoral, M.C.
000151392 700__ $$0(orcid)0000-0001-7379-6159$$aRomeo, L.M.$$uUniversidad de Zaragoza
000151392 7102_ $$15004$$2590$$aUniversidad de Zaragoza$$bDpto. Ingeniería Mecánica$$cÁrea Máquinas y Motores Térmi.
000151392 773__ $$g391 (2025), 134668$$pFuel$$tFuel$$x0016-2361
000151392 8564_ $$s3286925$$uhttps://zaguan.unizar.es/record/151392/files/texto_completo.pdf$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2027-03-01
000151392 8564_ $$s507799$$uhttps://zaguan.unizar.es/record/151392/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2027-03-01
000151392 909CO $$ooai:zaguan.unizar.es:151392$$particulos$$pdriver
000151392 951__ $$a2025-03-07-09:33:42
000151392 980__ $$aARTICLE