Abstract

ROJAS GONZALEZ, Andrés Felipe; BARRAZA BURGOS, Juan Manuel  and  PINERES, Jorge Luís. Vitrinite-rich coal concentrate intrinsic reactivity index. Ing. Investig. [online]. 2007, vol.27, n.3, pp.45-51. ISSN 0120-5609.

This work defines a new reactivity coal combustion parameter called intrinsic reactivity index (IRI), combining reactive maceral fraction (vitrinite/liptinite), non-reactive maceral fraction (inertinite/intrinsic mineral matter) and vitirinite reflectance averages. Coal samples from La Yolanda and Guachinte (Valle del Cauca) collieries were used to evaluate the IRI; samples consisted of original and vitrinite concentrated fractions obtained from froth flotation column. This new parameter was compared to three conventional parameters: weighted mean activation energy (WMAE), peak temperature (PT) and final temperature (FT). Results revealed that vitrinite concentrated fractions had higher IRI figures than original coal. This meant that vitrinite concentrated fractions presented higher reactivity to combustion than original coal. Results also showed that EAMP, TP and TF decreased with an increase in IRI, suggesting that coal combustion reactivity becomes improved when vitirinite concentration in coal is increased.

Keywords : intrinsic reactivity index; combustion; flotation column; froth flotation; maceral.

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