新型柱浮选泡沫自吸输送装置内流特性的数值模拟

Numerical simulation of flow characteristics of new self-sucking device for column flotation froth transportation

采用Fluent软件对叶轮直径450 mm、高度142 mm的吸浆器进行了气液两相数值模拟,研究了气泡直径、叶轮转速和含气率对吸浆器内流特性的影响。结果表明:气泡直径和含气率是影响吸浆器吸浆能力的关键因素,当含气率达45%时,叶片吸力面附近气相回流现象基本消失,但含气率越高,吸浆器的吸浆能力越低;气泡直径越大,叶轮中心区域和叶片吸力面区域含气率越高,聚集在叶轮中心区的气团越大,吸浆器的吸浆能力越低;叶轮转速越高,叶轮内气液分离现象越明显。

A numerical simulation for self-sucking device with the impeller diameter of 450 mm,and the impeller height of 142 mm,was performed using Fluent software,the influence of bubble diameter,impeller speed and gas holdup on flow characteristics was studied.The results show that the bubble diameter and the gas holdup are key factors influencing the performance of self-sucking device,when the gas holdup is 45%,the back flow of gas phase basically disappears on the suction surface of blade,but with the increasing of the gas holdup,the self-sucking capability decreases;with the increasing of the bubble diameter,the gas holdup goes up on the central area of impeller and the suction surface of blade,the air mass increases which congregating on the central area of impeller,and the self-sucking capability decreases;with the increasing of the impeller speed,the phenomenon of gas-liquid separation is more obvious in the impeller.