转筒干燥器的设计和高效化方面

像沙，碎石，肥料和食品等产品的干燥，是在工业生产过程的重要一步。随着对减少温室气体排放量和能源需求的日益重视干燥机组的设计已成为关键。在过去的一段时间里回转烘干机已在一些情况下热效率很低，这主要是由于设计的不当。另一方面流化床干燥器热效率非常高，由于了解对个别粒子的气流安葬接触和对设计原则更好的理解。因此，流化床干燥机设计科学的手段使这些单位比较容易设计，即使每一类单位之间的热能源的需求大致相同。问题是，工程知识的水平都还没有推出旋转干燥机，这使的这些单位的设计一般并且热效率不高。
   本文探讨了一个旋转干燥器和用于干燥矿渣的流化床干燥机之间的差异。重要的是要理解旋转式干燥机的设备和设计方面的要求之间的差异。旋转干燥机设计的困难之一是确定在任何时刻通过气流的材料的数量。工作由卡梅隆和理斯特展开（1990）。

The drying of products like sand, aggregates, fertilizers and food products is an important step in industrial processes.  With an increasing focus on reducing greenhouse gas emissions and energy demand the design of drying units has become critical.  In the past rotary dryers have been in some cases thermally very inefficient primarily due to poor design. Fluid bed dryers on the other hand are thermally very efficient due to the interment contact of the gas stream with individual particles and a better understanding of the design principles.   Thus, the science of fluid bed dryer design means these units are relatively easy to design even though thermal energy demand between each type of unit is approximately the same.  The problem is that the same level of engineering knowledge has not been available for rotary dryers and as consequence these drying units are generally over designed and thermally inefficient.

DESIGN AND EFFICIENY ASPECTS OF ROTARY DRYERS

by Greg Palmer, B.E. Ph.D. and Tony Howes*, B.E. Ph.D.

Palmer Technologies Pty Ltd, Brisbane, Australia

* Department of Chemical Engineering, University of Queensland, St. Lucia 4072 Australia.

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