论文部分内容阅读
采用计算流体力学软件Fluent、简化的三维Eulerian两相流和Realizable k-ε湍流模型,并结合SIMPLE算法对直径40 m的氧化铝赤泥沉降槽内的固液分离过程进行数值模拟,以得到槽内流场形态和赤泥浓度的分布规律.通过对比计算结果和现场测试数据,并结合自定义分析评价指标,分析了有无溢流围堰和中心下料桶的不同进料方式下沉降槽的固液分离和赤泥沉降的流动规律.结果表明,去掉沉降槽的溢流围堰后浆液的固相浓度降低84.3%;采用自吸式射流进料管,60～64 g/L固相浓度范围内的浆液在中心桶内所占体积由3.70%提高到14.36%,可有效促进中心桶内赤泥浓度分布的均匀性,提高平底沉降槽内赤泥的沉降分离效率.
The computational fluid dynamics software Fluent, the simplified three-dimensional Eulerian two-phase flow and the Realizable k-ε turbulence model were used in combination with the SIMPLE algorithm to simulate the solid-liquid separation process in an alumina red mud settler with a diameter of 40 m to obtain a The shape of inner flow field and the distribution of red mud concentration were studied.According to the calculated results and the field test data, combined with the custom analysis and evaluation index, it was analyzed whether the overflow tank with different feeding ways The results showed that the solid concentration of the slurry decreased 84.3% after the overflow cofferdam was removed from the sedimentation tank. The self-priming jet feeding tube and the solid phase of 60 ~ 64 g / L The volume of the slurry in the central barrel increases from 3.70% to 14.36% in the concentration range, which can effectively promote the uniformity of the red mud concentration distribution in the central barrel and improve the sedimentation separation efficiency of the red mud in the flat bottom sedimentation tank.