Based on CaO and Fe2O3 content in coal ash

21 typical Chinese coal samples are categorized into low-calcium-low-ferric

medium-calcium-medium-ferric

medium-calcium-high-ferric

high-calcium-low-ferric

and high-calcium-high-ferric.The characteristic of cohesiveness-temperature of coal molten ash was measured by a high-temperature rotary viscometer

Factsage.The thermodynamic equilibrium of their molten states was calculated and the relationship between liquid molten slag

solid mineral crystal and viscosity of the slag was studied.Influences of initial SiO2/Al2O3 mass ratio

solid crystals and composition of liquid-slag on the behavior of coal ash melting and characteristic of cohesiveness-temperature of the molten slag were analyzed and discussed in detail.A simple and practical method based on ash composition data of coal is provided to predict coal ash melting behavior and evaluate adaptability to entrained flow gasifier.The order of coal adapting to liquid-state slagging of entrained flow gasifier could be

from high to low

as follows:medium-calcium-high-ferric

high-calcium-low-ferric

medium-calcium-medium-ferric

low-calcium-low-ferric

and high-calcium-high-ferric.