95794 20210902121929.0 doi 10.3390/en13164164 sideral 120229 ART-2020-120229 eng Arauzo, P.J. Combustion characteristics of hydrochar and pyrochar derived from digested sewage sludge 2020 Access copy available to the general public Unrestricted In this paper, hydrochars and pyrochars were produced at 260 ºC under different residence times (2 and 4 h) using anaerobic digested sewage sludge (SSL) as initial feedstock. The effect of reaction time on the fuel properties of hydrochars and pyrochars was evaluated. Moreover, the combustion kinetics of raw SSL and the derived pyrochars and hydrochars without coal blending were determined at two different air flows (20 and 90 mL/min) and compared. In the same conditions, the yield of hydrochar was significantly lower than that of pyrochar, confirming the different reaction pathways followed in each process. The results showed hydrochars have lower carbon recovery and energy yield than pyrochars, making the latter more suitable for energy purposes. The thermogravimetric combustion study showed that both thermochemical treatments increased the ignition temperature but decreased the burnout temperature, which results in higher stability during handling and storage. However, raw SSL is better for combustion than hydrochar according to the combustibility index. In addition, the kinetic study showed that the activation energy of the combustion of biochars, especially pyrochar, is lower than that of raw SSL, which is advantageous for their combustion. info:eu-repo/grantAgreement/EC/H2020/721991/EU/Advanced Carbon Materials from Biowaste: Sustainable Pathways to Drive Innovative Green Technologies/ GreenCarbon This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 721991- GreenCarbon info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.004 2020 ENERGY & FUELS 70 / 114 = 0.614 2020 Q3 T2 0.597 2020 Control and Optimization 2020 Q2 Electrical and Electronic Engineering 2020 Q2 Renewable Energy, Sustainability and the Environment 2020 Q2 Energy Engineering and Power Technology 2020 Q2 Fuel Technology 2020 Q2 Energy (miscellaneous) 2020 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Atienza-Martínez, M. (orcid)0000-0002-5047-5106 Ábrego, J. Universidad de Zaragoza (orcid)0000-0003-4493-6540 Olszewski, M.P. Cao, Z. Kruse, A. 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 13, 6 (2020), 4164 [15 pp] ENERGIES Energies 1996-1073 603680 http://zaguan.unizar.es/record/95794/files/texto_completo.pdf Versión publicada 480872 http://zaguan.unizar.es/record/95794/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:95794 articulos driver 2021-09-02-10:53:45 ARTICLE