建立生物质鼓泡流化床气化过程的动力学三维数理模型,气相采用k-ε湍流模型,固相采用基于颗粒动理学理论封闭模型,并自编化学反应子模型.研究了气化炉内固相体积分数、各相的速度以及气化产物的组分的分布,并预测了水蒸气与生物质质量比(S/B)对气化的影响.在鼓泡床的下段固相和气相的速度均呈现振荡变化,特别是在床高H=0.18 m处,由于物料的加入,两相速度在此附近有较大的振荡.在接近鼓泡床床层表面,固相的速度达到了最大.随S/B的增加CO、H2的摩尔分数增加,CO2、CH4的摩尔分数减少,在S/B=3.4时,各气体的摩尔分数趋于稳定.
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