Deep insight into the ash fusibility and viscosity fluctuation behavior during co-gasification of coal and indirect coal liquefaction residue

• Effect of ICLR addition on ash fusibility and viscosity of YCW coal were studied. • “Barbed-shape” needle-like crystal was the main cause of viscosity fluctuation. • ICLR additive inhibited the increase of crystal aspect ratio and volume fraction. • The addition of ICLR alleviated the viscosity fluctuation behavior of YCW coal ash. Co-gasification of coal and indirect coal liquefaction residue (ICLR) is an effective approach to large-scale...