Fractal characteristics and reactivity evolution of lignite during the upgrading process by supercritical CO2 extraction

In this study, an upgrading process of lignite with supercritical CO2 extraction under rather mild temperatures was studied as a possible method for producing clean solid fuel with less moisture and enhanced combustion reactivity. The fractal characteristics and reactivity evolution of two typical lignites during the upgrading process by supercritical CO2 extraction have been studied in present work. Two typical lignites and one subbituminous...