Abstract: Mainly three groups exist in the fluidized bed: macro-agglomerates, micro-agglomerates, and free-particles. Agglomerates were generated by using TEB nozzles. Macro-agglomerates were distributed at the bottom of the fluidized bed, while micro-agglomerates and free-particles were uniformly distributed in the fluidized bed. The conductance signals measured by the self-developed multi-channel conductance electrical circuit experimental device showed linear relationship with moisture content inside the fluidized bed. Conductance signal was recovered under the influence of agglomerates breakup by continuous fluidization, so that measurement of moisture distribution could be implemented. Measurement of moisture distribution with TEB atomization nozzle gas liquid ratio in the range of 0-4% indicated that with the increase of gas liquid ratio, the moisture content in the micro-agglomerates and free-particles increased, while the moisture content in the macro-agglomerates decreased. But even when gas liquid ratio increased to 4%, most of the moisture content still existed in the macro-agglomerates.

Key words: conductance signal, agglomerates, fracture, moisture content, fluidized bed

摘要： 在流化床中团聚物主要以宏观团聚物、微小团聚物、自由颗粒3种形式存在，通过TEB雾化喷嘴制造流化床颗粒团聚物，其中宏观团聚物沉积在流化床的底部位置，微小团聚物和自由颗粒均匀分布在整个流化床中。研究发现本文自主研制开发的多通道电导电路实验装置测量所得电导信号与流化床内水分含量存在线性比例的关系，利用流化床的持续流化效应造成团聚物破裂引发电导信号回升，实现了颗粒团聚物水分分布状态的测量。利用该装置测量了TEB雾化喷嘴气液比在0～4%范围内变化时流化床内颗粒及团聚物的水分分布状态，结果表明随着气液比的增加，微小团聚物、自由颗粒所包含的水分有所增加，宏观团聚物所包含的水分有所减小，即使在气液比增加到4%时，大量的水分仍然被宏观团聚物所吸收。

关键词: 电导信号, 团聚物, 破裂, 水分, 流化床