Abstract: Pressure profiles in the flow channels and beds in a F3000 mm′7000 mm cold model of multi-layered radial flow reactor were measured and the flow properties of multi-layered radial reactor investigated. The results showed that when the mean square root of the pressure difference between distributing and collecting channels was smaller than 1%, the mean square root of the pressure difference between beds and maximum deviation of radial velocity along the axial direction of the beds were smaller than 5%. But when that of the pressure difference between the channels was greater than 10%, radial velocity along the axial direction of the beds became nonuniform. The flow maldistribution of the bed near the flow channel with the large change of pressure gradient was the biggest and the deviation of radial velocity on the top and the bottom of the bed was greater than 70%. The P-type flow gives the best flow distribution for the momentum recovery radial reactor and proper design of the pressure difference between distributing and collecting channels can ensure a uniform distribution in a multi-layered radial reactor.

Key words: radial reactor, momentum exchange, multi-layered bed, flow distribution, flow field

摘要： 在直径3 m、高5 m的大型多床层径向反应器冷模装置上，通过测定流体在流道和各分床层内的静压分布，考察了各分床层的流体流动行为和特征. 结果表明，当流道静压差的均方根偏差小于1%时，各分床层静压差的均方根偏差小于5%，流体在各分床层的径向流速沿轴向分布均匀，流速最大偏差小于5%；当流道静压差沿轴向的差别大于10%时，则其沿轴向分布显著不均匀，且靠近流道静压变化梯度大的分床层的径向流速均匀性最差，床层上下端流速偏差达70%. P型流动形式是动量交换型径向反应器的最佳选择，适宜的两流道静压差设计可实现径向流速沿床层轴向完全均匀分布.

关键词: 径向反应器, 动量交换, 多床层, 流体分布, 流场