Oxygen-enriched combustion characteristics of lignite: A case study of the Pingzhuang lignite from inner Mongolia, China

Combustion curves of lignite samples from China in four different particle sizes and Oxygen-enriched condition were analyzed using non-isothermal thermogravimetric method. The lignite samples separated into -150+100 mu m, -100+75 mu m, -75+50 mu m, and -50 mu m sizes. Combustion profiles shift to lower temperature zone as particle size decrease. Combustion profiles have little difference when the particle size below 100 mu m in oxygen atmosphere; Oxygen-enriched combustion experiment were carried out in O-2/N-2 mixture atmospheres with the volume fraction of oxygen was 21%, 30%, 40%, 50%, 60% and 70%, respectively. As oxygen concentration increase profiles shift to lower temperature zone. and gets the proper range of oxygen concentration is about 50%.