32190 20170503140338.0 doi 10.1016/j.fuel.2014.03.059 sideral 86684 ART-2014-86684 eng (orcid)0000-0002-8704-9274 Gil-Lalaguna, N. Air-steam gasification of char derived from sewage sludge pyrolysis. Comparison with the gasification of sewage sludge 2014 Access copy available to the general public Unrestricted Air-steam gasification of char derived from fast pyrolysis of sewage sludge has been experimentally evaluated in a fluidized bed as a route towards a full recovery of energy from sewage sludge. The results have been compared with those obtained from the direct gasification of sewage sludge in order to evaluate how the previous pyrolysis stage affects the subsequent gasification process. The fixed carbon content in the solid increased after the pyrolysis stage so that heterogeneous reactions of carbon with steam or CO2 assumed greater importance during char gasification than during sewage sludge gasification. Furthermore, char gasification led to an improvement in the gas yield -calculated on a dry and ash-free basis (daf)- due to the increased concentration of carbon in the organic fraction of the solid after the pyrolysis step, with an increase in the average CO yield of about 70% -in terms of g/kg solid daf-. The reduction in the fraction of carbon which forms tar is another advantage of char gasification over the direct gasification of sewage sludge, with an average decrease of about 45%. Regarding the influence of the operating conditions, the response variables were mainly controlled by the same factors in both processes. info:eu-repo/grantAgreement/ES/MINECO/CTQ2010-20137 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.52 2014 ENGINEERING, CHEMICAL 13 / 135 = 0.096 2014 Q1 T1 ENERGY & FUELS 19 / 89 = 0.213 2014 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-9705-2207 Sánchez, J.L. Universidad de Zaragoza (orcid)0000-0002-3771-8994 Murillo, M.B. Universidad de Zaragoza Ruiz, V. (orcid)0000-0002-4364-2535 Gea, G. Universidad de Zaragoza 5005 790 Universidad de Zaragoza Departamento de Ingeniería Química y Tecnologías del Medio Ambiente Tecnologías del Medio Ambiente 5005 555 Universidad de Zaragoza Departamento de Ingeniería Química y Tecnologías del Medio Ambiente Ingeniería Química 129 (2014), 147-155 Fuel FUEL 0016-2361 605759 http://zaguan.unizar.es/record/32190/files/texto_completo.pdf Postprint 63429 http://zaguan.unizar.es/record/32190/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:32190 articulos driver 2017-05-03-13:58:35 ARTICLE