新型旋风管内颗粒浓度分布的实验研究

在Shell型旋风管基础上进行了结构与尺寸的优化匹配，得到一种新型高效旋风管. 采用等动采样方法，对新型旋风管内的颗粒浓度场进行了测试与分析. 实验结果表明，新型旋风管开有排尘槽的锥形排尘结构有较好的分离效果，并在一定程度上可以降低颗粒的返混；加设导流锥结构可显著减少短路流，并能使细小颗粒受到较强的惯性作用而得到分离. 灰斗上方区域，沿轴向向上颗粒浓度呈下降的趋势，表明内旋流对颗粒具有较强的二次分离作用. 对粒级效率的估算结果表明，新型旋风管可将粒径大于7 mm的颗粒全部除净，3~7 mm的细小颗粒的粒级分离效率可达86%以上，而相同操作条件下Shell型旋风单管仅能将10 mm以上的颗粒除净. 本工作为旋风管的结构改进、尺寸优化乃至工业推广应用提供了必要的基础.

Experimental Study on Particle Concentration Distribution in a Novel Cyclone Tube

A novel cyclone tube design is obtained on the basis of structural and dimensional optimization of Shell-type cyclone tube. By using isokinetic sampling method, the particle concentration distribution in the novel cyclone tube is measured and analyzed. The experimental result demonstrates that discharge dust cone with slots has better separation effect, flowguide cone can reduce short circuit flow greatly and makes small grain separated because of the strong inertia. Particle concentration decreases with axial coordinates increasing above the ashpit, which indicates that the inner revolving flow has a strong secondary separation effect. The estimation on particle grade efficiency suggests that the novel cyclone tube can separate particles of 7 mm completely, for small particles of 3~7 mm, its grade separation efficiency is above 86%. On contrast, Shell-type cyclone tube can only separate particles larger than 10 mm completely in the same operation condition. This work provides a necessary basis for structural improvement, dimensional optimization and even industrial application of cyclone tube.