进气方式对气力提升效率的影响规律研究

为阐明进气方式增强气力提升作用的机理及过程, 以气力提升装置为研究对象, 研究了气孔分布方式对排沙量及提升效率的影响规律。结果表明: 相同浸入率下, 周向均布气孔方式较带中心孔的周向均布气孔方式排沙量和效率均上扬, 且各组对应差值均随气量值增加显著上升; 提升效率随气量值升高其变化关系大致呈M形, 即出现两峰值与之对应, 其中最高峰值所处位置与排沙量峰值对应点几近吻合; 任一进气方式下其无量纲实验散点近乎服从于同一分布函数, 并与理论模型吻合较好。研究成果为更好地理解和优化气力提升参数提供了重要的参考。

Experimental Study of Effect of Air-injection Method on Airlift Efficiency

In order to explain the mechanism of air-injection method for enhancing airlifting, the influence of pore distribution on mass flow rate of solids and airlift efficiency was studied with some airlifts in the experiment. The results are as follows: the mass flow rate of solids and lifting efficiency of air-injector with pores being circumferentially distributed were both higher than that of air-injector with pores being in the center and circumferentially distributed with the same submergence ratio. The difference value of each group increased significantly with the air volume flow. The relationship between efficiency and air volume flow followed a roughly M-shaped curve, namely with two peak values. The peak point of air volume flow was nearly coincident with that of mass flow rate of solids. The dimensionless experimental data obtained with any air-injection method nearly followed the same function curve, being in consistent with the theoretical model. The research results can provide a reference for optimizing air-lifting parameters.