A pure two-fiuid model for turbulent combusting gas-particle fiows with reacting coalparticles, using unified Eulerian treatment of both gas phase and particle phase, was used tosimulate three-dimensional gas-particle flows and pulverized coal combustion in a combus-tor. The coal particle history effect, caused by the mass change due to moisture evaporation,devolatilization and char reaction is described only by partial differential equations in Eule-rian coordinate. Both velocity slip and temperature slip between coal particle phase and gasphase were predicted by solving momentum equations and energy equations of gas and coalparticle phase respectively. A pure two-fiuid model for turbulent combusting gas-particle fiows with coal particles, using unified Eulerian treatment of both gas phase and particle phase, was used tosimulate three-dimensional gas-particle flows and pulverized coal combustion in a combus- tor. coal particle history effect, caused by the mass change due to moisture evaporation, devolatilization and char reaction is described only by partial differential equations in Eule-rian coordinate. Both velocity slip and temperature slip between coal particle phase and gasphase were predicted byulsion momentum equations and energy equations of gas and coalparticle phase respectively.