渐扩进料体旋流器分级性能试验研究

Experimental research on the classification performance of the hydrocyclone with conical feed part

针对水力旋流器处理细粒级颗粒分级时易出现溢流跑粗的问题,设计出一种渐扩式进料体旋流器,并通过粉煤灰的分级试验,研究底流口直径、压力、给料浓度对其分离性能的影响。研究表明,随着底流口直径增大,底流浓度减小、底流产率升高、分级粒度变细,分级效率明显增大;随着压力增大,溢流浓度减小,底流浓度明显升高,分级效率升高;随着给料浓度增大,溢流和底流浓度都升高,底流产率减小,分级效率降低。当底流口直径为Φ18mm、压力为0.06MPa、浓度为16%时,旋流器分离粒度d50为54μm,且-54μm分级质效率为49.50%,量效率为88.66%;此时,溢流-45μm含量达到88%以上,符合一级灰标准。

The overflow granularity often became coarse when fine particles were classified in a hydrocyclone. In order to solve this probiem, a new type of hydrocyclone with conieal feed part was put forward and an experimental study on its separating performance for fly ash grading was carried out. Different structural and operating parameters including the apex diameter, the inlet pressure and the feed concentration have been used in the experiments. The experimental results show that, as the apex diameter increases,the underflow concentration decreases but the productive rate increases, and the comprehensive classification efficiency is improved obviously. When the inlet pressure increases, the overflow concentration decreases while the underflow concentration and the classification efficiency increases at the same time. However, compared with the increasing overflow and underflow concentration, both the underflow production rate and the classification efficiency gradually decrease with the increase of feed concentration. In conclusion,the grading granularity ds0 is 54μm,and the classification efficiency reaches 88.66% by quantity and 49. 50% by quality when the apex diameter is 18mm, the inlet pressure is 0. 06MPa and the feed concentration is 16 %. Moreover, the --45μm particle content is above 88 %, which meets the requirement of the first grade fly ash standard well.