Abstract

The multistage drying system is one of the novel methods that has small specific energy consumption (SEC) compared to the conventional single drying systems. Rotary and fluidized bed dryers are the conventional drying systems of suspension-grade polyvinyl chloride (S-PVC). This article describes the energy consumption characteristics of a two-stage pneumatic fluidized bed drying system for drying of S-PVC. Computational Fluid Dynamics is used to anticipate the hydrodynamics and drying mechanisms with Eulerian–Lagrangian and Eulerian–Eulerian approach in the pneumatic dryer and fluidized bed dryer, respectively. The experimental study is accomplished using spiral pneumatic and a fluidized bed dryer. The investigation of the SEC and influence of a two-stage drying system on S-PVC drying has been set as the main target. The result shows that by using the two-stage pneumatic-fluidized bed drying in certain conditions, the SEC is reduced up to 8255 kJ/kg and an average of 5260 kJ/kg compared with fluidized bed single-stage drying.

摘要

多级干燥系统是一种新型方法，与传统的单级干燥系统相比，其比能耗 (SEC) 小。旋转床和流化床干燥机是悬浮级聚氯乙烯 (S-PVC) 的常规干燥系统。本文介绍了用于干燥 S-PVC 的两级气动流化床干燥系统的能耗特性。计算流体动力学分别用于在气动干燥器和流化床干燥器中通过欧拉-拉格朗日和欧拉-欧拉方法预测流体动力学和干燥机制。实验研究是使用螺旋气动和流化床干燥器完成的。SEC 的研究和两级干燥系统对 S-PVC 干燥的影响已被设定为主要目标。