脉冲式密相气力输送水平管中的料栓行为  

Behavior of the Gas-granule Plug Flow along a Horizontal Pipeline

作　　者：郭艳[1] 易江林[1] 金涌[1] 俞芷青[1] 

机构地区：[1]清华大学化工系,北京100084

出　　处：《过程工程学报》2001年第2期147-151,共5页The Chinese Journal of Process Engineering

摘　　要：探讨了聚丙烯颗粒在脉冲式密相气力输送水平管中的料栓行为,结果表明在一定操作气速下,料栓的长短变化有规律,料栓的运动速度随其长度而变;栓长为1 m左右的聚丙烯颗粒由栓状流向沙丘流型转变的料气速度之比为0.7～0.8,出现在操作气速5 m/s左右;单个料栓的压力梯度与其长度有关,沿单个料栓的压力梯度和截面固含量随气速而变;料栓压降与操作气速无关,The investigation on the horizontal plug flow of polypropylene granules was conducted in a dense-phase pneumatic conveying system with pipeline of 50 mm in diameter, 11 m of vertical section and 19 m of horizontal section. The mini-pressure drop sensor and solid pipeline section concentration detector were used. It is found that the length of plug moving in the pipeline changes with time. The profiles of cross-sectional solid average concentration and pressure gradient along plugs vary with the gas velocity. The pressure drop across the plug is proportional to the square of plug length and independent of the gas velocity.

关 键 词：脉冲式密相气力输送 料栓行为 流动方式 压力降 聚丙烯颗粒 水平管 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TQ022.3