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以直径1 m的搅拌槽为模型、含水率92%的污泥和粒径0.1 mm的固体颗粒为工作介质,采用Fluent软件对错位六叶螺旋桨搅拌下污泥与固体颗粒的混合过程进行数值模拟,通过与普通六叶螺旋桨对比,分析了2种桨型的浓度场分布、混合时间及单位体积混合能,并将计算的固体颗粒浓度分布与实验结果进行了比较.结果表明,固体颗粒浓度分布计算结果和实验结果吻合较好,流动场分布对混合过程有一定影响,相同条件下错位桨搅拌的浓度场分布更快趋于稳定.当转速N=4 r/s时,错位六叶螺旋桨的混合时间为27 s,比六叶螺旋桨的混合时间缩短9 s.采用错位桨单位体积混合能仅为普通桨的79.6%,节能效果显著.
Using a stirred tank with a diameter of 1 m as a model, sludge with 92% moisture content and solid particles with a particle size of 0.1 mm were used as working media. The mixing process of sludge and solid particles under dislocation six-bladed propeller was simulated by Fluent software , The concentration field distribution, mixing time and unit volume mixing energy of the two paddles were analyzed by comparison with the conventional six-bladed propeller, and the calculated solid particle concentration distribution was compared with the experimental results.The results show that the concentration distribution of solid particles The calculated results agree well with the experimental results, and the distribution of flow field has a certain influence on the mixing process. Under the same conditions, the concentration field of dislocated paddle agitates faster and tends to be stable. When the rotation speed N = 4 r / s, The mixing time is 27 s, which is 9 s shorter than the mixing time of the six-bladed propeller. The unit volumetric mixing energy of dislocation paddles is only 79.6% of ordinary paddles, and the energy saving effect is remarkable.