环空射流浮选装置吸气性能研究

Suction capacity of annular jet flotation device

利用引射吸气方式设计了一种环空射流浮选装置.为研究该浮选装置的吸气能力,对环空喷嘴在不同入料压力、喷嘴距下的吸气量、负压及叶轮转速的关系进行研究,分析射流吸气能力受射流边界层厚度2e与喷嘴出口直径D参数间关系的影响规律.结果表明:在同一喷嘴距条件下,环空喷嘴吸气量及喷嘴内的负压值随入料压力的增加逐渐增加,叶轮转速随入料压力增加先增加后平缓而后再增加;低入料压力、小喷嘴距条件下, 2e<D,喷嘴的吸气能力较弱;随入料压力及喷嘴距的增加,2e≥D,喷嘴吸气能力逐渐增强,喷嘴内负压环境更加稳定;在高入料压力、大喷嘴距条件下,2e?D,负压区被水介质占据,吸气区内气相空间体积被压缩,环空喷嘴吸气能力骤降.

An annular jet flotation device was designed according to the jet suction mode. In order to study the inspiratory capacity of the flotation device, the relationship between the suction volume, negative pressure and impeller speed of the annular nozzle under different feeding pressure and nozzle distance was studied. The influence of jet boundary layer thickness 2e and the nozzle exit diameter D on jet suction capacity was also analyzed. The results show that the annular nozzle suction volume and the negative pressure gradually increase with the increase of the feeding pressure under the same nozzle distance condition;the impeller speed first increases, then remains steady and goes up again. Under the condition of low feeding pressure and small nozzle distance, 2e<D, and the suction capacity of the nozzle is weak. With the increase of feeding pressure and nozzle distance, 2e≥D, the suction capacity increases gradually, and the negative pressure environment of the nozzle is more stable. Under the condition of high feeding pressure and large nozzle distance, 2e>>D, the negative pressure zone is occupied by water medium, the gas phase space volume of suction zone is compressed, and the suction capacity of the annular nozzle drops sharply.