Study on the Influence of Central Cone Structure on Flow Field and Separation Efficiency of Hydrocyclone
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摘要:
使用计算流体力学软件FLUENT15.0对中心锥上锥段底角为40°、45°、50°、55°水力旋流器进行了数值模拟，通过数值分析研究中心锥结构对水力旋流器内流场及分离效率影响，并考虑中心锥结构的磨损情况。模拟结果表明：适当的减小上锥段底角能提高分离效率，并改善上锥段的磨损情况，而过小的上锥段底角反而会降低分离效率，加重上锥段的磨损情况，说明中心锥上锥段底角在40°~50°之间存在着一个最佳角度，该角度能够得到较高的分离效率以及较小的磨损。模拟结果也为进一步优化中心锥结构提供了参考。
Abstract:FLUENT 15.0, a computational fluid dynamics software, was used to numerically simulate the hydrocyclone with 40°, 45°, 50° and 55° of the upper cone angle of the central cone. The influence of central cone structure on flow field and separation efficiency in hydrocyclone are studied by numerical analysis, and taking into account the erosion status of the central cone structure.The simulation results indicate that proper reduction of the upper cone angle can improve the separation efficiency and improve the erosion status of the upper cone section, while too small upper cone angle will reduce the separation efficiency and increase the erosion status of the upper cone section. It can be seen that there is an optimum angle between the 40° and 50° of the upper cone angle of the central cone, which can result in higher separation efficiency and less erosion. The simulation results also provide a reference for further optimization of the central cone structure.
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Key words:
- hydrocyclone /
- computational fluid dynamics /
- central cone structure /
- erosion /
- separation efficiency
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表 1 入口颗粒粒径累计分布
Table 1. Inlet particle size cumulative distribution
Range of sizes/μm d/μm F(d) < 1 1 0.002 < 3.58 3.58 0.010 < 6.16 6.16 0.028 < 8.74 8.74 0.057 < 11.32 11.32 0.097 < 13.89 13.89 0.149 < 16.47 16.47 0.210 < 19.05 19.05 0.280 < 21.63 21.63 0.356 < 24.21 24.21 0.436 < 26.79 26.79 0.517 < 29.37 29.37 0.596 < 31.95 31.95 0.672 < 34, 53 34, 53 0.742 < 37.11 37.11 0.805 < 39.68 39.68 0.860 < 42.26 42.26 0.907 < 44.84 44.84 0.945 < 47.42 47.42 0.976 < 50 50.00 1.000 
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表 2 不同上锥段底角旋流器分离效率
Table 2. Separation efficiency of different upper cone angle of hydrocyclone
角度/(°) 入口处进入的总颗粒数 溢流口逃逸的颗粒数 底流口捕集的颗粒数 分离效率/% 55 2 880 829 2 051 71.22 50 2 880 775 2 105 73.09 45 2 880 557 2 323 80.66 40 2 880 901 1 979 68.72
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表 3 不同上锥段底角旋流器压降及分离效率对比
Table 3. Comparison of the pressure drop and separation efficiency of different upper cone angle of hydrocyclone
角度/(°) 55 50 45 40 压降/Pa 50 412.15 53 543.92 55 267.78 44 835.52 分离效率/% 71.22 73.09 80.66 68.72
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