工业水平管道输送油砂尾矿中沥青残留物的计算流体动力学研究
Computational fluid dynamics investigation of bitumen residues in oil sands tailings transport in an industrial horizontal pipe
摘要：
油砂尾矿中的沥青残留物可能对环境构成威胁，因此在处置前将其与尾矿分离至关重要。然而，尾矿浆中的低沥青浓度和四相混合物的复杂输送特性使得该过程困难。建立了工业规模油砂尾矿管道的欧拉-欧拉CFD模型。对载体-固体和固体-沥青拖曳模型的选择进行了全面的敏感性分析。小颗粒尺寸和大颗粒尺寸的组合（即，75和700 μ m）和沥青液滴尺寸（即，400 μ m）在速度分布和压降方面与现场数据具有良好的一致性。随后将验证的模型扩展到研究第二阶段的影响（即，沥青液滴和气泡）对尾矿管道中流动特性的影响。研究范围包括沥青液滴尺寸（100-400 μ m）、沥青分数（0.0025-0.1）、气泡尺寸（5-1000 μ m）和气泡分数（0.0025-0.3），并揭示了它们对速度、固体和沥青分布的影响。对于500 μ m的最佳气泡尺寸，从管道横截面的顶部50%获得59%的最大回收率，从管道横截面的顶部75%获得83%的最大回收率。本研究表明，沥青的优先分布，并提供了有价值的见解沥青回收工业规模的尾矿管道。
英文摘要：
Bitumen residues in the oil sand tailings can be a threat to the environment that separating them from tailings before disposal is crucial. However, low bitumen concentration in the tailings slurry and the complex transport characteristics of the four-phase mixture make the process difficult. This study establishes an Eulerian-Eulerian CFD model for an industrial-scale oil sand tailings pipeline. A comprehensive sensitivity analysis was conducted on the selection of carrier-solid and solid-bitumen drag models. The combination of small and large particle sizes (i.e., 75 & 700 um) and bitumen droplet size (i.e., 400 um) provided good agreement with field data in velocity profiles and pressure drop. The validated model was subsequently extended to investigate the influence of the secondary phase (i.e., bitumen droplets and bubbles) on flow characteristics in a tailing pipeline. The investigation covered a range of bitumen droplet size (100-400 um), bitumen fraction (0.0025-0.1), bubble size (5-1000 um), and bubble fraction (0.0025-0.3) and their influences on the velocity, solids, and bitumen distribution are revealed. For an optimum bubble size of 500 um, a maximum recovery of 59% from the top 50 % and 83 % from the top 75 % of the pipe cross-section was obtained. The present study demonstrates the preferential distribution of bitumen and provides valuable insight on bitumen recovery from an industrial-scale tailings pipeline.
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