A Two-Fluid Model for Simulating Turbulent Gas-Particle Flows, Coal Combustion and NO{sub}X Formation in an Oxygen-Coal Combustor

摘要

A pure two-fluid model for turbulent combusting gas-particle flows with reacting coal particles, using unified Eulerian treatment of both gas phase and particle phase, was used to simulate 3-D gas-particle flows and pulverized coal combustion in a combustor for the first time. The particle history effect, caused by the mass change due to moisture evaporation, devolatilization and char reaction is described only by partial differential equations in Eulerian coordinate. Both velocity slip and temperature slip between coal particles phase and gas were predicted by solving momentum equations and energy equations of gas and particle phases respectively. A k-ε-k{sub}p two-phase turbulence model and a second-order moment model of NO{sub}X formation were incorporated into the comprehensive model. Predictions give reasonable results.