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The Scientific World Journal
Volume 2013, Article ID 479403, 8 pages
http://dx.doi.org/10.1155/2013/479403
Research Article

An Experimental Investigation of Sewage Sludge Gasification in a Fluidized Bed Reactor

1IMARENABIO, University of León, Avenida de Portugal 41, 24071 León, Spain
2CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
3Department of Applied Chemistry and Physics, University of León, Campus de Vegazana, 24071 León, Spain

Received 26 September 2013; Accepted 18 November 2013

Academic Editors: A. Acir, C. Koroneos, and T. Morosuk

Copyright © 2013 L. F. Calvo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The gasification of sewage sludge was carried out in a simple atmospheric fluidized bed gasifier. Flow and fuel feed rate were adjusted for experimentally obtaining an air mass : fuel mass ratio (A/F) of . Fuel characterization, mass and power balances, produced gas composition, gas phase alkali and ammonia, tar concentration, agglomeration tendencies, and gas efficiencies were assessed. Although accumulation of material inside the reactor was a main problem, this was avoided by removing and adding bed media along gasification. This allowed improving the process heat transfer and, therefore, gasification efficiency. The heating value of the produced gas was 8.4 MJ/Nm, attaining a hot gas efficiency of 70% and a cold gas efficiency of 57%.