TY - JOUR
TI - Oxygen-enriched combustion mechanism of lignite
AU - Chen Xiangyun
AU - Zhang Yongfeng
AU - Zhang Yinmin
JN - Thermal Science
PY - 2020
VL - 24
IS - 4
SP - 2411
EP - 2418
PT - Article
AB - In this work, thermogravimetric experiments were carried out in a  thermogravi-metric analyzer under O2/N2 atmosphere with an oxygen content  ranging from 21 vol.% to 70 vol.%. Malek method combined with  iso-conversional method and non-isothermal method was employed to determine  the burning dynamical function of lignite in high temperature burning  region with different oxygen concentrations. The results indicated that the  lignite has different burning dynamical function in different oxygen  conditions. The combustion mechanism function of lignite belonged to 3-D  model when the oxygen concentration is below 30%. The combustion mechanism  of lignite belongs to a random successive nucleation growth model when the  oxygen concentration is between 40% and 50%. Kinetic burning model of  lignite in high burning temperature region with different oxygen  concentrations was established. The kinetic parameters were obtained from  the kinetic burning model of lignite using Kissinger-Akah-Sunose method.