2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 2: Gudenau Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Kleinschmidt G, Pook H, Ohno K, Wu K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-25-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Combustion of Coals and Thermally-Treated Eucalyptus Aiming at Blast Furnace Injection: Differences in Chars Structure and Reactivity
Juliana Goncalves Pohlmann1; Antonio Cezar Vilela1; Eduardo Osorio1; Angeles G. Borrego2; Maria Antonia Diez2;1FEDERAL UNIVERSITY OF RIO GRANDE DO SUL, Porto Alegre, Brazil; 2INSTITUTO NACIONAL DEL CARBON - INCAR, Oviedo, Spain;
Type of Paper: Regular
Id Paper: 221
Topic: 2
Abstract:
Reduction of CO2 emissions due to partial substitution of coal by a renewable fuel, like woody biomass, is a subject of increasing interest in the ironmaking process. This study aims to investigate the combustibility of eucalyptus densified at different temperatures and of two bituminous coals typically used for Pulverized Coal Injection (PCI) in blast furnace. The coals range from low to high-volatile bituminous and biomasses were thermally-treated in order to reach similar volatile matter content of coals on a dry-ash-free (daf) basis. Combustion at different O2 concentrations of pulverized samples (36-80µm) was carried out in a Drop Tube Furnace (DTF) at 1300 °C. The characteristics of the chars were evaluated by its reactivity to CO2 in thermobalance, optical microscopy and adsorption isotherms techniques. The conversion of densified biomasses in the DTF was greater than that of the coals with similar volatile matter contents. The biomass yielded chars with a well-defined cellular structure and isotropic optical texture whereas the chars from bituminous coals showed anisotropic cenospheric particles with high porosity in the walls. The N2 and CO2 specific surface areas of the biomass-chars were significantly higher than those of the coal-chars. The differences between the two biomass-chars and the two coal chars were small regarding distribution of porosity and reactivity, but great when comparing coals and biomasses to each other. The higher reaction rate of biomass-chars compared to coal-chars could be positive to the incorporation of this kind of biomass in blends for pulverized injection in blast furnace tuyeres.
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