高通量循环流化床提升管内Geldart B类颗粒团聚特性研究

发布时间：2018-01-10 12:24

本文关键词：高通量循环流化床提升管内Geldart B类颗粒团聚特性研究　出处：《高校化学工程学报》2016年05期 　论文类型：期刊论文

【摘要】：在内径60 mm、高5.5 m的循环流化床提升管实验装置上,基于光纤探针所测颗粒浓度信号、采用小波分解方法,研究了高通量操作条件下Geldart B类颗粒(石英砂)的团聚特性(团聚物颗粒浓度、持续时间和频率等)。研究表明,团聚物在提升管轴径向分布不均匀,且与操作条件密切相关。在提升管中心区域,团聚物颗粒浓度小,持续时间短,出现频率较高;而在边壁区域则相反。团聚物颗粒浓度和持续时间随循环量的增加而增加,随气速的增加而减小;聚团频率的变化趋势相反,且在低气速下随着循环量的增加先增加后减小。
[Abstract]:Based on the particle concentration signal measured by optical fiber probe, the wavelet decomposition method is used in the experimental device of circulating fluidized bed riser with 60 mm inner diameter and 5.5 m high. The agglomeration characteristics (concentration, duration and frequency of aggregate particles) of Geldart B particles (quartz sand) under high throughput operation conditions were studied. The distribution of aggregates in the axial diameter of the riser is not uniform and is closely related to the operating conditions. In the central region of the riser, the aggregate particle concentration is small, the duration is short, and the occurrence frequency is high. The particle concentration and duration of agglomerates increase with the increase of circulation and decrease with the increase of gas velocity. The change trend of cluster frequency is opposite, and at low gas velocity, it increases first and then decreases with the increase of circulation rate.
【作者单位】：华北电力大学国家火力发电工程技术研究中心;
【基金】：国家自然科学基金(51476085,91434120)
【分类号】：TQ051.13
【正文快照】： 1引言循环流化床以其高效的气固混合、传热和传质等优点被广泛应用于化工、能源和医药等工业领域。近年来,高通量循环流化床日益得到研究者的关注。针对高通量操作条件下提升管内气固两相宏观流动特性,众多学者进行了研究,但对提升管内微观流动结构特别是颗粒团聚特性的认识有

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