论文部分内容阅读
叙述了新开发的边续操作循环撞击流干燥机基本结构、工作原理和设计参数。以悬浮法PVC为对象，热态实验研究了干燥机的基本性能。结果表明，该干燥机用于单机脱除游离水和孔隙水是可行的：物料循环具有延长停留时间和有利于水分从颗粒内部向表面迁移的双重作用。实验和理论研究了干物料出口的安排，表明溢流方式不可行。以容积蒸发系数为主要判据，实验研究了某些重要结构和操作参数对悬浮法PVC循环撞击流干燥过程的影响。确定了最优撞击距离和下部间距，并为操作条件的选择指明了方向。
The basic structure, working principle and design parameters of the newly developed continuous operation impingement flow dryer are described. The suspension method of PVC as the object, the thermal experimental study of the basic performance of the dryer. The results show that this dryer is feasible for removing free water and pore water from a single machine. The material circulation has the dual function of prolonging the residence time and facilitating the migration of water from the interior to the interior of the particle. Experimental and theoretical study of the dry material export arrangements, indicating that overflow mode is not feasible. Taking the volume evaporation coefficient as the main criterion, the influence of some important structures and operating parameters on the drying process of PVC impact flow by suspension method was studied experimentally. The optimal impact distance and lower spacing were determined and the direction was chosen for the selection of operating conditions.