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基于欧拉多相流模型,自编化学反应子模型,通过建立生物质流化床气化动力学模型,对某实验室规模的流化床生物质气化炉进行了数值模拟,研究了蒸汽与生物质的质量比(mS/mB)、生物质粒径对产气组分、蒸汽分解率等的影响.结果表明:mS/mB增大,H2体积分数先上升后保持不变,而CO和CH4的体积分数先下降后几乎不变,蒸汽分解率下降;生物质粒径减小有利于气化过程,使CO和H2的体积分数明显上升;计算结果和试验结果基本吻合,表明基于欧拉多相流的动力学模型能对流化床中生物质的气化进行比较准确的模拟.
Based on Eulerian multiphase flow model and self-made chemical reaction submodel, a laboratory-scale fluidized bed biomass gasifier was numerically simulated by setting up a biomass fluidized bed gasification kinetic model. The effects of steam And mass fraction of biomass (mS / mB), biomass particle size on gas component and steam decomposition rate were studied.The results showed that when mS / mB increased and H2 volume fraction increased first, the content of CO And the volume fraction of CH4 decreased first and then decreased, the steam decomposition rate decreased. The decrease of biomass particle size was beneficial to the gasification process, and the volume fraction of CO and H2 significantly increased. The calculated results were in good agreement with the experimental results, The kinetic model of the multiphase flow can simulate the biomass gasification in the fluidized bed more accurately.