Abstract:
Based on threeregion model and shortcircuit model of entrainedflow gasifier, the space in a gasifier was divided into combustion region, jetflow secondary reaction region, recirculation secondary reaction region and plug flow secondary reaction region. The primary homogeneous reactions were calculated by Gibbs equilibrium model while the secondary homogeneous reactions and all heterogeneous reactions were calculated by kinetic model. The simulation results showed that the temperature distribution and gas composition of each region of gasifier are in good agreement with those of gasifier simulated by Gibbs equilibrium model. According to appropriate temperature range of the gasifier, the partition model predicted the range of optimal oxygencoal ratio and steamcoal ratio.