| On the basis of gas-solid two-phase hydromechanics theory, variable-diameter pulsed airseparation technology was promoted, mechanism of separating particles in variable diameterspulsed airflow field based on density was researched in this paper, variable diameters pulsed airseparator was designed, variable diameters pulsed air separation system was established. Inconstant airflow field, the effect of velocity on heavy product distribution, separation density andseparation efficiency were researched, and the effect of feed characteristics and separator structureon separation efficiency was discussed. In pulsed airflow field, the effects of pulsation on-off ratio,pulsation period, pulsation airflow, and pulsed airflow on heavy product distribution andseparation efficiency for5-3.2mm fine coal were researched. With orthogonal experiment,mathematical model between separation efficiency and constant airflow, pulsation airflow, pulseon-off ratio was gained. On this basis, the rule of setting pulsation on-off with different granularityand washable feed was studied?and separation efficiency in pulsed airflow of5-2.5mm fine coalwas researched. The influence of variable-diameter structure and airflow velocity distribution onseparating by density was analysed by means of numerical simulating... |
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