A model for predicting solid particle behavior in petroleum sludge during centrifugation
A model for predicting solid particle behavior in petroleum sludge during centrifugation
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DOI：
10.1016/j.fuel.2013.09.002
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发表时间：
2014-01
期刊：
影响因子：
7.4
通讯作者：
Qun-xing Huang;Xu Han;F. Mao;Y. Chi;Jian-hua Yan
中科院分区：
文献类型：
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作者：
Qun-xing Huang;Xu Han;F. Mao;Y. Chi;Jian-hua Yan
提出了一种有效的模型，用于根据粒度分布和石油粘度来预测离心过程中石油污泥中固体颗粒的行为。对分别从含有石油废水的污水库和石油储罐收集的石油污水污泥（PSS）和油罐底污泥（OBS）进行了研究。测量固体颗粒去除率和油回收率以评估模型的效率。该模型预测，在离心过程中，固体颗粒可以被分离成三组，PSS 的临界分离尺寸为 69.2 和 80.3 μm，OBS 的临界分离尺寸为 91.2 和 110.3 μm，大于较小临界分离尺寸的颗粒可以在室温下从每个污泥中有效去除，无需预处理。对于三个 PSS 粒径范围（按升序排列），使用三阶段离心过程的预测累积颗粒去除率分别为 50%、61% 和 70%，这与实验测量值（分别为 54%、65% 和 75%）非常吻合。实验水/油乳状液回收率分别为86%、81%和75%。 PSS的粘度随着温度的升高而迅速下降，预热使PSS的固体颗粒去除率提高了29%。添加溶剂使 PSS 的固体颗粒去除率提高到 90%，OBS 的固体颗粒去除率提高到 82%，但导致水/油乳液回收率降低到 PSS 的 69% 和 OBS 的 67%。模型和实验结果表明，应在评估石油粘度和固体颗粒尺寸分布后确定最佳离心时间。
An efficient model is proposed for predicting the behavior of solid particles in petroleum sludge during centrifugation, from the particle size distribution and petroleum viscosity. Petroleum sewage sludge (PSS) and oil-tank bottom sludge (OBS), respectively collected from a sewage reservoir containing petroleum waste water and a petroleum oil storage tank, were studied. The solid particle removal and oil recovery rates were measured to assess the efficiency of the model. The model predicted that solid particles could be separated into three groups during centrifugation, with critical separation sizes of 69.2 and 80.3 μm for the PSS and 91.2 and 110.3 μm for the OBS, and that particles larger than the smaller critical separation size could be removed from each sludge efficiently at room temperature without pretreatment. The predicted cumulative particle removal rates using a three-stage centrifugation process were 50%, 61%, and 70%, for the three PSS-particle size ranges (in ascending order), which agreed well with experimental measurements (54%, 65%, and 75%, respectively). The experimental water/oil emulsion recovery rates were 86%, 81%, and 75%, respectively. Preheating enhanced the solid particle removal rate by 29% for PSS whose viscosity decreasing quickly with increasing temperature. Adding a solvent increased the solid particle removal rates to 90% for the PSS and 82% for the OBS, but caused the water/oil emulsion recovery rates to decrease to 69% for the PSS and 67% for the OBS. The model and experimental results suggest that the optimum centrifugation time should be determined after assessing the petroleum viscosity and the solid particle size distribution.