测算散料低速栓流气力输送压降和栓速的新方法

A New Method for Determining Pressure Drop and Slug Velocity of Low-speed Slug Flow Pneumatic Transfer of Bulk

低速栓流气力输送技术已广泛应用于散料输送,然而对其输送对象的研究大多数针对有规则形状的散料(如塑料切片、小麦),对于不规则形状的散料(如牛奶什锦早餐、玉米芽等)的研究却很少。提出了一种新的预测方法,它根据粒子的特性及从一个简单的垂直测试筒得到的数据,可以精确地预测低速栓流气力输送系统中的压降和栓速,即使是大型的气力输送系统。该方法适用于规则、不规则或不同性能(如不同形状、密度、粒径和粒度分布)的散料的低速栓流气力输送,预测的结果可满足设计和操作要求。

Low-velocity slug-flow pneumatic conveying is applied increasingly in industry and to a wide range of bulk solid materials. However,most investigations focus on bulk solid materials with regular shape such as plastic pellets,wheat. And very little work is undertaken with irregular shaped materials such as muesli,maize germ.In this paper,a new test-design procedure is presented.Based on particle properties and data from a simple vertical test chamber,the pressure drop and slug velocity in low-velocity slug flow can be predicted accurately in large-scale systems.This procedure can be applied to bulk solid materials with regular,irregular and/or unusual physical properties such as different shape,density,size and size distribution,as long as they are good candidates for this mode of pneumatic conveying.