Abstract

This paper shows how the problem of simulation and design of integrated direct rotary dryer and cooler can be solved in an algorithmic way. In the last few decades dryers and coolers are often assembled in one unit to save space and/or energy (process integration). Several types of construction of such units have been proposed. Since the coupling between models describing both parts of such a unit exists, usually a “trial and error” method is used in the design process to get an acceptable agreement with design specifications. This work shows how to bypass this drawback. Three exemplary cases are studied to illustrate the suggested approach: (1) countercurrent dryer and cooler, (2) cocurrent dryer and countercurrent cooler, (3) double-pass cocurrent dryer and countercurrent cooler. The three cases correspond to typical commercial designs. In addition, an algorithmic way of dimensioning the drum and its interior is presented.

摘要

本文说明如何以算法方式解决集成直接旋转式干燥机和冷却器的仿真和设计问题。在最近的几十年中，干燥机和冷却机通常组装成一个单元，以节省空间和/或能源（过程集成）。已经提出了几种类型的这种单元的构造。由于描述这种单元的两个部分的模型之间存在耦合，通常在设计过程中使用“试验和错误”方法来获得与设计规范的可接受的协议。这项工作显示了如何绕过此缺点。研究了三种示例性情况以说明建议的方法：（1）逆流干燥器和冷却器，（2）并流干燥器和逆流冷却器，（3）双程并流干燥器和逆流冷却器。这三种情况对应于典型的商业设计。