气流床气化炉气化过程的分区模拟

摘要

Based on three-region model and short-circuit model of entrained-flow gasifier,the space in a gasifier was divided into combustion region,jet-flow 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 oxygen-coal ratio and steam-coal ratio.%基于气流床气化炉的三区及短路混合模型,将气化炉炉内空间按流场-化学反应特征划分为燃烧区、射流区二次反应区、回流区二次反应区和管流区二次反应区。对一次均相反应采用Gibbs平衡模型,二次均相反应、非均相反应采用动力学模型进行了模拟计算,得到了气化炉中各分区的温度和气体组成,并将其结果与Gibbs平衡模型的计算结果进行了对比,吻合良好;在气化炉适宜的操作温度范围内,采用该模型预测了最优的氧煤比和蒸汽煤比的调节范围。