Bed Particle Agglomeration in Circulating Fluidized Bed Burning High-sodium Zhundong Coal

被引：0

作者：

Liu Z. ^{[1
]}

Li J. ^{[1
]}

Long X. ^{[1
]}

Wang Q. ^{[1
]}

Lu X. ^{[1
]}

机构：

[1] Key Laboratory of Low Grade Energy Utilization Technology and System, Ministry of Education (Chongqing University), Shapingba District, Chongqing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2022年 / 42卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Bed particle agglomeration; Blast-furnace slag; Circulating fluidized bed; Zhundong coal;

D O I：

10.13334/j.0258-8013.pcsee.210302

中图分类号：

学科分类号：

摘要：

This presented work presents an experimental investigation into bed particle agglomeration in a lab-scale circulating fluidized bed burning Zhundong coal at 950 °C using quartz sand and blast-furnace slag (BFS) respectively as the bed material. The surface and cross-sectional morphology, mineralogy and chemistry of the bottom ash were analyzed by using Environmental SEM-EDS, XRD and XRF for revealing the mechanisms of particle agglomeration. Results show that in the quartz case, the surface of the discrete bed particle was coated by a layer of sub-micron particles being enriched in Ca/Mg/Si/Fe, whereas the agglomerated particles were bound by Ca/Na/Si eutectics as the "neck". The presence of the sticky coating layer and low melting-points Ca/Na/Si eutectics would promote bed particle agglomeration. In the BFS case, the bottom ash was found not agglomerated as observed, due to its special mineralogy, chemistry and surface structure, preliminarily proving that BFS might be a potential viable bed material effectively alleviating bed particle agglomeration. © 2022 Chin. Soc. for Elec. Eng.

引用

页码：2248 / 2257

页数：9

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