The aim of this work was to characterize the fluid dynamic behavior of mixtures of biomass with sand as inert material and to determine the fluidization curves of each mixture. For comparison purposes, mixtures of coal with sand were also studied. Biomasses investigated were eucalyptus bark (Eucalyptus sp.), pine bark (Pinus elliottii), and pine wood chips. The experiment was performed in a scaled cold reactor with internal diameter of 94 mm and 1200 mm in height. Samples had average particle sizes of 0.537 mm (eucalyptus bark), 0.579 mm (pine bark), 0.729 mm (pine chip) and 0.680 mm (coal). The mixtures with sand were made in proportions between 20 and 60% of biomass or coal in volume. Fluidization curves were analyzed, and the minimum fluidization velocity (u_mf) was determined. The minimum fluidization velocity was highly affected by biomass concentration and type, meaning that even for similar density and particle size, biomass morphology and composition are influential features in the process of fluidization. The experimental results of the minimum fluidization velocity were compared with empirical correlations from literature. The errors were very large, suggesting the need to develop specific correlations for these types of biomasses.

这项工作的目的是表征生物质与惰性材料砂的混合物的流体动力学行为，并确定每种混合物的流化曲线。为了比较，还研究了煤与沙子的混合物。研究的生物量为桉树皮（Eucalyptus sp。），松树皮（Pinus elliottii）和松木屑。该实验在一个内径为94毫米，高为1200毫米的规模冷反应器中进行。样品的平均粒度为0.537mm（桉树皮），0.579mm（松树皮），0.729mm（松木屑）和0.680mm（煤）。与沙子的混合物的比例为生物质或煤炭的20％至60％（体积）。分析流化曲线，并计算最小流化速度（u_mf）已确定。最小流化速度受生物质浓度和类型的高度影响，这意味着即使对于相似的密度和粒径，生物质形态和组成也是流化过程中的影响特征。将最小流化速度的实验结果与文献中的经验相关性进行了比较。误差非常大，表明需要针对这些类型的生物质开发特定的相关性。