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Vitrinite-rich coal concentrate intrinsic reactivity index
Índice de reactividad intrínseco de carbones concentrados ricos en vitrinita
DOI:
https://doi.org/10.15446/ing.investig.v27n3.14844Keywords:
intrinsic reactivity index, combustion, flotation column, froth flotation, maceral (en)índice de reactividad intrínseco, combustión, columna de flotación, flotación espumante, macerales (es)
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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.
En este trabajo se definió un nuevo parámetro de reactividad de carbón a la combustión llamado índice de reactividad intrínseco (IRI), el cual combina la fracción maceral reactiva (vitrinita/liptinita), la fracción maceral no reactiva (inertinita/materia mineral intrínseca) y la reflectancia media a la vitrinita. Para evaluar el IRI se utilizaron muestras de carbón de las minas La Yolanda y Guachinte (Valle del Cauca) original, sin tratar, y fracciones concentradas en vitrinita obtenidas en una columna de flotación burbujeante. Este nuevo parámetro de reactividad se comparó con tres parámetros convencionales ampliamente usados para medir la reactividad de carbones, que son: la energía de activación media ponderada (EAMP), temperatura pico (TP) y temperatura final (TF). Los resultados mostraron que los carbones concentrados en vitrinita presentaron mayores valores del IRI en comparación con los originales, lo cual significa que esas fracciones concentradas en vitrinita presentan mayor reactividad en la combustión que los carbones originales sin tratar. Los resultados también mostraron que la EAMP TP y TF decrecen con el incremento en el IRI, lo cual sugiere que la reactividad en la combustión de los carbones se mejora si su contenido de vitrinita se incrementa.
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Copyright (c) 2007 Andrés Felipe Rojas González, Juan Manuel Barraza Burgos, Jorge Luís Piñeres Mendoza
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