A mathematical model of fluidized bed biomass gasification
A mathematical model of fluidized bed biomass gasification
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DOI：
10.1002/cjce.5450710407
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发表时间：
1993-08
影响因子：
2.1
通讯作者：
J. Bilodeau;N. Thérien;P. Proulx;S. Czernik;E. Chornet
中科院分区：
文献类型：
--
作者：
J. Bilodeau;N. Thérien;P. Proulx;S. Czernik;E. Chornet
建立了生物质流化床气化的数学模型。它考虑了气泡和乳液相中浓度和温度的轴向变化。质量平衡包括生物质的瞬时氧化和平衡脱挥发，固气气化反应动力学以及气相反应和相间传质和气体对流。能量平衡对每个垂直体积单元进行局部求解，并通过对床底温度的迭代对反应器进行全局求解。根据实验结果调整了三个参数：壁面传热系数、水气转换反应动力学的权重以及脱挥发后生物质炭的剩余比例。该模型用于模拟中试规模（50 kg/h）生物质气化炉，并将其预测结果与实验测量结果进行比较。在使用木材原料的实验中，除了氢的浓度被高估外，温度和气体浓度的估计精度很高。
A mathematical model of biomass gasification in a fluidized bed has been developed. It considers axial variations of concentrations and temperature in the bubble and emulsion phases. The mass balance involves instantaneous oxidation and equilibrium devolatilization of the biomass, kinetics of solid-gas gasification reactions as well as of gaseous phase reactions and interphase mass transfer and gas convection. The energy balance is solved locally for each vertical volume element, and globally on the reactor by iteration on the temperature at the bottom of the bed. Three parameters have been adjusted based on the experimental results: the heat transfer coefficient at the wall, the weighting of the kinetics of the water-gas shift reaction and the fraction of biomass carbon remaining as char after devolatilization. The model is used to simulate a pilot scale (50 kg/h) biomass gasifier, and its predictions compared to experimental measurements. The temperature and gaseous concentrations are estimated with good accuracy for the experiments using a wood feedstock, except for the concentration of hydrogen which is overestimated.