TAILIEUCHUNG - Study of catalytic post-treatment of the vapours from sewage sludge pyrolysis by means of c-Al2O3

The present work describes an experimental study on sewage sludge pyrolysis in a Fluidised Bed Reactor(FluBR) and the effect on the pyrolysis liquid product of passing the hot exhaust (pyrolysis) vapours through a Fixed Bed Reactor (FixBR) filled with gamma-alumina (c-Al2O3). | Fuel 107 2013 113-121 Contents lists available at SciVerse ScienceDirect Fuel journal homepage locate fuel Study of catalytic post-treatment of the vapours from sewage sludge pyrolysis by means of c-Al2O3 M. Azuaraa I. Fontsa b P. Barcelona a . Murilloa G. Geaa a Thermochemical Processes Research Group GPT Aragón Institute for Engineering Research I3A Universidad de Zaragoza Mariano Esquillor s n E-50018 Zaragoza Spain b Centro Universitario de la Defensa de Zaragoza Ctra. Huesca s n 50090 Zaragoza Spain HIGHLIGHTS y-Al2O3 is useful for obtaining a better pyrolysis liquid from the point of view of its phase separation. y-Al2O3 application makes it possible to lower the pyrolysis temperature. A general improvement in the higher heating value of the organic phases has been achieved. Energy content of the organic phase is comparable to a conventional fuel. ARTICLE INFO ABSTRACT Article history Received 9 February 2012 Received in revised form 31 January 2013 Accepted 7 February 2013 Available online 26 February 2013 Keywords Pyrolysis Sewage sludge Gamma-alumina Biomass Catalytic treatment The present work describes an experimental study on sewage sludge pyrolysis in a Fluidised Bed Reactor FluBR and the effect on the pyrolysis liquid product of passing the hot exhaust pyrolysis vapours through a Fixed Bed Reactor FixBR filled with gamma-alumina y-Al2O3 . Experiments have been done at temperatures of 450 and 550 C FluBR and 400 and 500 C FixBR . In the FixBR experiments the bed was filled with inert sand and two different bed quantities of y-Al2O3 g g giving a weight hour space velocity WHSV of between and h 1. By means of this treatment the pyrolysis liquid phase separation was improved obtaining a liquid with two phases organic and aqueous instead of the three two organic and an aqueous phase usually obtained in sewage sludge pyrolysis without applying y-Al2O3. This organic phase is quite interesting from the point of view of a

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