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首页> 外文期刊>International Journal of Multiphase Flow >Classification of concentrated suspensions using inclined settlers
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Classification of concentrated suspensions using inclined settlers

机译：使用倾斜沉降器对浓缩悬浮液进行分类

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Sedimentation vessels with parallel inclined walls are able to clarify or classify particle suspensions more rapidly than conventional settlers due to their increased surface area and decreased settling distances. The use of continuous inclined settlers to classify or separate particles by size and/or density from concentrated suspensions is considered. Mass balances are applied to each particle species in order to predict its concentration in the settler overflow (fine fraction) and settler underflow (coarse fraction), given the settler geometry, operating conditions, fluid and particle properties, and the particle c concentration and size distribution in the feed. A hindered settling function with no adjustable parameters is employed for bidisperse and polydisperse suspensions. Unlike many processes, it is shown that the efficiency of the classification process increases with increasing particle concentration in the feed, as measured by an increasing fraction of smaller or slower-settling particles partitioning to the fine fraction rather than contaminating the coarse fraction. This is a direct result of hindered settling, which reduces the settling rate and increases the relative concentration of slower-settling particles in the upper portion of the vessel. Experimental data are presented for bidisperse suspensions of glass and acrylic beads and of coal particles and yeast cells, and for polydisperse suspensions of polystyrene latex beads. The results are in good agreement with the model predictions.
机译：具有平行倾斜壁的沉淀容器由于其表面积增加和沉降距离减少，因此比常规沉降器能够更快地澄清或分类颗粒悬浮液。考虑使用连续的倾斜沉降器通过尺寸和/或密度从浓缩的悬浮液中分类或分离颗粒。给定沉降器的几何形状，运行条件​​，流体和粒子特性以及粒子c的浓度和大小，可对每种粒子应用质量平衡，以预测其在沉降器溢流（细馏分）和沉降器底流（粗馏分）中的浓度。在Feed中分配。对于双分散和多分散悬浮液，使用没有可调整参数的受阻沉降函数。与许多方法不同，它表明，分级过程的效率随着进料中颗粒浓度的增加而增加，这是通过将较小或更慢沉降的颗粒的比例增加分配为细颗粒而不是污染粗颗粒来衡量的。这是沉降受限的直接结果，沉降降低了沉降速率并增加了较慢沉降颗粒在容器上部的相对浓度。给出了玻璃和丙烯酸珠粒，煤颗粒和酵母细胞的双分散悬浮液以及聚苯乙烯胶乳珠的多分散悬浮液的实验数据。结果与模型预测非常吻合。

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