150414 20251017144641.0 sideral 60984 ART-2008-60984 eng Aznar, M. Universidad de Zaragoza Influence of freeboard temperature, fluidization velocity and particle size on tar production and composition during the air gasification of sewage sludge 2008 Access copy available to the general public Unrestricted The influence of freeboard temperature, fluidization velocity, and particle size on tar production and composition during the air gasification of dried sewage sludge has been researched using a bench-scale gasifier. Of the operating variables analyzed, the results obtained from a statistical analysis (ANOVA and PCA) indicate that only the freeboard temperature has a significant influence on tar production. The results also show that freeboard temperature is the key factor that influences the tar composition. A high freeboard temperature reduces the amount of tar produced, but the tar compounds obtained are mainly PAH, which could require a more complicated secondary treatment for tar removal. Nevertheless, an increase in the freeboard temperature value implies a substantial increase in both low heating value and cold gas efficiency (6.5% and 10.8%, respectively, when the required freeboard temperature was increased from 873 to 1123 K). Future studies should focus on testing/developing catalytic materials able to degrade (in a secondary treatment) tar with a high content of PAH compounds. info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 2.056 2008 ENGINEERING, CHEMICAL 18 / 113 = 0.159 2008 Q1 T1 ENERGY & FUELS 15 / 66 = 0.227 2008 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Manyà, J. J. Universidad de Zaragoza (orcid)0000-0002-0118-3254 García, G. Universidad de Zaragoza Sánchez, J.L. Universidad de Zaragoza (orcid)0000-0002-9705-2207 Murillo, M. B. Universidad de Zaragoza (orcid)0000-0002-3771-8994 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 X Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Proy. investigación HKA 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 22, 4 (2008), 2840-2850 Energy fuels Energy and Fuels 0887-0624 518042 http://zaguan.unizar.es/record/150414/files/texto_completo.pdf Postprint 644104 http://zaguan.unizar.es/record/150414/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:150414 articulos driver 2025-10-17-14:32:15 ARTICLE