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Advances in Materials Science and Engineering
Volume 2018 (2018), Article ID 3807609, 14 pages
https://doi.org/10.1155/2018/3807609
Research Article

Evaluation of Carbonisation Gas from Coal and Woody Biomass and Reduction Rate of Carbon Composite Pellets

1Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
3Osaka University, JFE Steel Corporation, 1 Kawasaki-cho, Chuo-ku, Chiba 260-0835, Japan
4School of Mines, Federal University of Ouro Preto (UFOP), 35400-000 Ouro Preto, MG, Brazil
5Vanzolini Foundation, University of São Paulo, Avenida Paulista, 967-3° Floor, 01311-100 São Paulo, SP, Brazil
6School of Mines, UFOP, Campus Morro do Cruzeiro, 35400-000 Ouro Preto, MG, Brazil
7School of Mines, UFOP, 522 Igaporã, 46490-000, BA, Brazil
8Materials and Metallurgy, UFOP/REDEMAT, Praça Tiradentes 20, 35400-000 Ouro Preto, MG, Brazil

Correspondence should be addressed to Tateo Usui; pj.ca.u-akaso.gne.tam@iusu

Received 26 June 2017; Accepted 28 September 2017; Published 11 March 2018

Academic Editor: Liming Lu

Copyright © 2018 Tateo Usui 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

Carbon composite iron oxide pellets using semichar or semicharcoal were proposed from the measured results of the carbonisation gas release behaviour. The carbonisation was done under a rising temperature condition until arriving at a maximum carbonisation temperature Tc,max to release some volatile matter (VM). The starting point of reduction of carbon composite pellets using semicharcoal produced at Tc,max = 823 K under the rising temperature condition was observed at the reduction temperature TR = 833 K, only a little higher than Tc,max, which was the aimed phenomenon for semicharcoal composite pellets. As Tc,max increases, the emitted carbonisation gas volume increases, the residual VM decreases, and, as a whole, the total heat value of the carbonisation gas tends to increase monotonically. The effect of the particle size of the semicharcoal on the reduction rate was studied. When TR is higher than Tc,max, the reduction rate increases, as the particle size decreases. When TR is equal to Tc,max, there is no effect. With decreasing Tc,max, the activation energy Ea of semicharcoal decreases. The maximum carbonisation temperature Tc,max may be optimised for reactivity (1/Ea) of semicharcoal and the total carbonisation gas volume or the heat value.