针对PVC等颗粒的干燥过程要求，设计并建立了多级旋流干燥系统．对其操作方式、流体力学特性进行了较为系统的研究．实验对气固逆流和气固并流两种操作方式分别进行了探讨．在多级旋流干燥器中成功地实现了气固逆流接触．并对旋流板结构、开孔率和操作气速对床层压降及床层平均密度的影响进行了研究，给出了气固逆流及并流操作时的操作性能曲线和操作窗口． Aiming at the requirement of drying process of PVC and other particles, a multi-stage cyclone drying system was designed and established. Its operation mode and fluid mechanics characteristics are systematically studied. Experiments on gas-solid countercurrent and gas-solid two methods of operation were discussed. In the multi-stage cyclone dryer successfully achieved gas-solid countercurrent contact. The influence of cyclone structure, opening rate and operating gas velocity on bed pressure drop and bed average density was also studied. The operation performance curves and operating window during gas-solid countercurrent and cocurrent operation were given.