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Journal of Combustion
Volume 2011 (2011), Article ID 303168, 9 pages
http://dx.doi.org/10.1155/2011/303168
Research Article

Adiabatic Gasification and Pyrolysis of Coffee Husk Using Air-Steam for Partial Oxidation

Conversion Energy Research Group, Mechanical Engineering Department, Universidad de los Andes, Kr 1 E No. 19A-40, Office ML 652, Bogotá, Colombia

Received 30 January 2011; Revised 14 April 2011; Accepted 28 April 2011

Academic Editor: Constantine D. Rakopoulos

Copyright © 2011 Catalina Rodriguez and Gerardo Gordillo. 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

Colombian coffee industry produces about 0.6 million tons of husk (CH) per year which could serve as feedstock for thermal gasification to produce gaseous and liquid fuels. The current paper deals with: (i) CH adiabatic gasification modeling using air-steam blends for partial oxidation and (ii) experimental thermogravimetric analysis to determine the CH activation energy ( 𝐸 ). The Chemical Equilibrium with Applications Program (CEA), developed by NASA, was used to estimate the effect of equivalence ratio (ER) and steam to fuel ratio (S : F) on equilibrium temperature and gas composition of ~150 species. Also, an atom balance model was developed for comparison purposes. The results showed that increased ER and (S : F) ratios produce mixtures that are rich in H2 and CO2 but poor in CO. The value for the activation energy was estimated to be 221 kJ/kmol.