压力脉动法探究U型还原室内床层流化特性

U型还原室是铁矿悬浮磁化焙烧炉的核心装置，其内部物料流化特性尚不明确.为此，搭建冷态试验系统，采用压力脉动法探讨了初始床层高度、松动风速及物料粒度对流化室内物料流化特性的影响，通过功率谱密度分析了流化机理.结果表明:松动风速和物料粒度是影响初始流化速度的主要因素，而初始床层高度影响不大;流化室内压力脉动随初始床层高度和松动风速增大而减小，随物料粒度增大而增大;功率谱分析揭示了气泡形成、聚并及破碎是导致压力脉动的根本原因.研究结果为悬浮磁化焙烧试验过程中操作参数的设计及优化提供了理论和数据支持.

Fluidization Characteristics of U-Typed Reduction Chamber with Pressure Fluctuation Method

The U-typed reduction chamber is the core reaction device of the iron suspension roaster. In order to study the fluidization characteristics， a cold experiment system of U-typed reduction chamber was established. Based on the experimental data collected by pressure fluctuation method， the following conclusions were drawn. Aeration velocity and particle size were the main factors affecting the initial fluidization velocity， while the initial bed height had little effect. With the increasing of initial bed height and aeration velocity， the pressure fluctuation in fluidization chamber became lower， but opposite result was obtained for particle size. Besides， power spectrum analysis revealed that the formation， coalescence and fragmentation of bubbles were the fundamental reasons for pressure fluctuation. The results would provide theoretical support for the design and optimization of the operating parameters during suspension magnetization roasting experiments.