开放式气力吸送系统设计方法  

Design method of open sucking pneumatic conveying system

作　　者：杨丹[1] 秋实[1] 沈继阳[1] 陈思林[1] 陈涛[1] 

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《化学工程》2012年第6期51-55,共5页Chemical Engineering(China)

摘　　要：由于吸嘴周围风速的衰减特性,开放式气力吸送系统的运行参数有别于封闭式气力吸送系统。针对入口风速38 m/s、内径40 mm的立管吸嘴,采用圆柱状流域吸气模型对吸嘴周围的风速分布进行了模拟。结果显示,距入口断面10 mm至20 mm处,轴线上的风速由15.7 m/s衰减至6.5 m/s。基于模拟结果,提出了开放式气力吸送系统设计方法进而设计了气力吸送装置。研究表明:在相同的固气比下,开放式气力吸送系统的压力损失比封闭式系统高137%,设计风量比后者高186%。在实验装置上开展了玻璃球散料的开放式吸送实验,实验结果与模拟数值吻合较好。As the air velocity around suction decreases evidently, the operation parameters of open sucking pneumatic conveying system are different to that of the closed system. For the suction mouth of open standpipe with inlet air velocity of 38 m/s and internal diameter of 40 mm, the air velocity distribution around the suction mouth was investigated by numerical simulation with a cylindrical model. The simulation result reveals that the air velocity of the axis decreases from 15.7 m/s to 6.5 m/s, while the suction distance increases from 10 mm to 20 mm. The design method of the open sucking pneumatic conveying system was advanced based on the results of numerical simulation and a sucking pneumatic conveying device was founded. The results indicate that the pressure loss and the volume flux of the open system are 137% and 186% respectively higher than those of the closed system when the solid loadings are equal. Using glass spheres, the suction experiment on the sucking device was tested and the experimental results approximately agree with the simulation results.

关 键 词：气力吸送 开放式吸嘴 风速分布 数值模拟 系统设计 

分 类 号：TQ051[化学工程]