【摘要】 为提高水介旋流器分选效果，设计了一种新型充气水介旋流器，即在水介旋流器溢流管上部设置充气装置，研究充气量、入料压力对充气水介旋流器分选效果的影响。试验结果表明，经溢流管充气后，溢流灰分基本不变，-0.5～+0.25 mm粒级的底流灰分由51.80%增加至72.75%,说明气体的引入对重选分选有促进作用，最佳充气量为2.4 Nm~3/h;在充气条件下，增大给料压力，各粒级溢流灰分小幅增大，底流灰分大幅增加，分选效果明显提高。采用Ansys Fluent软件，对充气水介旋流器进行流场模拟。模拟结果表明：经溢流管充气后，旋流器内空气柱消失，旋流器内部分区域流体流动迹线改变，底流口锥部出现一个较为明显的新分离区。对比试验和模拟结果可知，溢流管充气后旋流器内实际分选空间增大、流体流动特性改变及锥部分选作用增强是溢流管充气提高水介旋流器分选效果的主要原因。更多还原

【Abstract】 In order to improve the separation effect of the water-only cyclone, a new type of inflatable water-only cyclone was designed, that is, an inflatable device was set up at the top of the vortex finder of the water-only cyclone, and the influence of inflation rate and feeding pressure on the separation effect of the inflatable water-only cyclone was studied. The experimental results show that after inflation through the vortex finder, the overflow ash content remains basically unchanged, and the bottom flow ash content of-0.5 mm to +0.25 mm particle size increases from 51.80% to 72.75%, indicating that the introduction of gas has a promoting effect on re-selection and separation. The optimal inflation amount is 2.4 Nm~3/h. Under inflation conditions, increasing the feeding pressure results in a slight increase in overflow ash content at each particle level, a significant increase in underflow ash content, and a significant improvement in separation efficiency. Using Ansys Fluent software, the flow field of an inflatable water-only cyclone was simulated. The simulation results show that after inflation through the vortex finder, the air column inside the cyclone disappears, the fluid flow trajectory in some areas of the cyclone changes, and a more obvious and new separation zone appears in the cone of the underflow port. Combining the comparing experiment and simulation results, it can be concluded that the increase of the actual separation space in the cyclone, the change of the fluid flow characteristics and the enhancement of the separation effect in cone are the main reasons for the increase of the separation effect of the water-only cyclone after the vortex finder is inflated.更多还原