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在拜耳法生产氧化铝的过程中,为探索氢氧化铝结晶过程中的节能措施,采用工业试验和计算流体力学的方法对无搅拌氢氧化铝晶种分解槽中的固相分散规律进行了研究.试验结果表明,在正常工业流速条件下,无搅拌分解槽的大部分区域即从槽底至高度为25 m的范围内的固相质量含量差较小,仅为48.19 g/L,而在顶部的相对较小的区域即离槽面5 m范围内的固相质量含量差较大,达到149.66 g/L.因此,在正常工业流速条件下,无搅拌的分解槽中的固相分散不会完全向底部聚集.计算机模拟的结果也很好地揭示了这一固相分散规律,同时发现,随着槽内流速的增加,顶部较大固相质量含量差的区域逐渐收缩并向槽面靠拢,这意味着整个槽内的固相分布更加趋于一致.
In the process of Bayer alumina production, in order to explore the energy-saving measures in the crystallization process of aluminum hydroxide, the solid-state dispersion of unstirred aluminum hydroxide seeded tank was studied by means of industrial test and computational fluid dynamics The results show that at normal industrial flow rates, the mass fraction of the solid phase in the most part of the untimed decomposition tank, ie from the bottom to the height of 25 m, is only 48.19 g / L, The relatively small area at the top, ie, the mass difference of the solid phase within 5 m of the trough surface, is quite large, reaching 149.66 g / L. Therefore, under normal industrial flow rates, the solid phase dispersion in the unstirred trough Will be completely gathered to the bottom.Computer simulation results also reveal the solid phase dispersion law, also found that, as the flow velocity increases, the top of the larger solid phase with poor quality of the area gradually shrink and the groove surface Closer, which means that the distribution of the solid phase within the tank tends to be more consistent.