Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop
文献类型：期刊论文
| 作者 | Li, HZ; Tong, H |
| 刊名 | CHEMICAL ENGINEERING SCIENCE
 |
| 出版日期 | 2004-04-01 |
| 卷号 | 59期号:8-9页码:1897-1904 |
| 关键词 | fluidization ultrafine powders agglomerate multi-scale structure powder technology |
| ISSN号 | 0009-2509 |
| 其他题名 | Chem. Eng. Sci. |
| 中文摘要 | The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved. |
| 英文摘要 | The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Chemical |
| 研究领域[WOS] | Engineering |
| 关键词[WOS] | FORCES |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000221628600025 |
| 公开日期 | 2013-11-05 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/4966]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | Chinese Acad Sci, Inst Proc Engn, Multiphase React Lab, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, HZ,Tong, H. Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop[J]. CHEMICAL ENGINEERING SCIENCE,2004,59(8-9):1897-1904. |
| APA | Li, HZ,&Tong, H.(2004).Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop.CHEMICAL ENGINEERING SCIENCE,59(8-9),1897-1904. |
| MLA | Li, HZ,et al."Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop".CHEMICAL ENGINEERING SCIENCE 59.8-9(2004):1897-1904. |
入库方式： OAI收割
来源：过程工程研究所
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