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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Energy Res. | doi: 10.3389/fenrg.2019.00127

EXPERIMENTAL GASIFICATION OF COFFEE HUSK USING PURE OXYGEN-STEAM BLENDS

 Javier A. Bonilla1*, Gerardo Gordillo2 and  Carlos Cantor3
  • 1ECCI University, Colombia
  • 2University of Los Andes, Colombia, Colombia
  • 3Universidad Nacional Abierta y a Distancia (UNAD), Colombia

This work discusses results on temperature profile, syngas composition, High Heating Value, and efficiency of a Coffee Husk counter-current fixed-bed gasification process, in which oxygen-steam blends were used as oxidizing agent. The experimentation was carried out for various Equivalence Ratio (ER) and Steam-Fuel Ratio (SF), whose ranges were [1.6 – 5.6] and [0.4 – 0.8] respectively. The results show that Increased steam (higher steam fuel ratios) improves the H2/CO molar ratio i.e., for a constant ER=3.7 and SF at 0.4, 0.6, and 0.8, the H2/CO ratio was 1.2, 1.4, and 1.8 respectively. Also, the addition of steam tends to increase the syngas Higher Heating Value, which ranged between 7714 kJ/m3 at ER = 1.6 and SF = 0.4 and 8841 kJ/m3 at ER = 3.2 and SF = 0.8. On the other hand, increased ER (lower oxygen) decreases the Net Cold Gasification Efficiency (CGENET) which was between 53 % at ER = 5.6 and SF = 0.6 and 82 % at ER = 1.6 and SF = 0.4. Results were also compared to results published before for gasification of the same biomass but using air-steam mixtures for partial oxidation. This comparison shows that the use of oxygen increases both the temperature profile in the bed and the yield of CO and H2 contained in the syngas.

Keywords: Biomass Gasification, , Coffee husk, Updraft gasifier, Oxygen gasifying agent, syngas

Received: 17 Jul 2019; Accepted: 29 Oct 2019.

Copyright: © 2019 Bonilla, Gordillo and Cantor. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Javier A. Bonilla, ECCI University, Bogotá, Bogota, Colombia, jbonillap@ecci.edu.co