Numerical simulation of loop seal for a circulating fluidized bed based on an improved EMMS bubbling model
文献类型：期刊论文
| 作者 | Zhao, Meng1; Zhang, Nan1 ; Liu, Xinhua1; Du, Wei2
|
| 刊名 | POWDER TECHNOLOGY
 |
| 出版日期 | 2015-11-01 |
| 卷号 | 284期号:NOV页码:443-451 |
| 关键词 | Loop seal Circulating fluidized bed Numerical simulation Bubbling fluidization Gas flow Multiscale |
| ISSN号 | 0032-5910 |
| 英文摘要 | A typical loop seal consists of a supply chamber and a recycle chamber as well as a bottom connection slit in between. The supply chamber is generally operated in the minimum fluidization state, while the recycle chamber in the bubbling fluidization regime. The energy-minimization multi-scale (EMMS) model, as generally used to calculate interphase drag coefficient in previous simulations of the loop seal, is still open to discussion since it is based on the concept of particle clusters. So an EMMS bubbling model was developed to model dense gas-solid flow by taking into account the interphase interaction between the emulsion and bubble phases. In this article, a heterogeneity index is calculated from an improved EMMS bubbling model to measure the interphase drag coefficient and further integrated into the two-fluid-model (TFM) approach to simulate the loop seal for a circulating fluidized bed (CFB) system. This index is dependent on superficial gas velocity in bubbling fluidization, so a region-specific drag correction scheme is proposed to allow the application of various heterogeneity index correlations to different zones of the loop seal, since superficial gas velocity may differ much from the recycle to supply chamber. Several typical cases of drag correction are comparatively investigated by applying various gas velocities and/or drag models in the recycle and supply chambers, and the optimal one is proven to be able to reasonably simulate the parametric effects on gas inverse flow in the loop seal. (C) 2015 Elsevier B.V. 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] | GAS-SOLID FLOW ; GRANULAR FLOW ; CPFD METHOD ; OPERATION ; RECYCLE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000361582300051 |
| 公开日期 | 2015-12-27 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/19574]  |
| 专题 | 过程工程研究所_多相复杂系统国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Meng,Zhang, Nan,Liu, Xinhua,et al. Numerical simulation of loop seal for a circulating fluidized bed based on an improved EMMS bubbling model[J]. POWDER TECHNOLOGY,2015,284(NOV):443-451. |
| APA | Zhao, Meng,Zhang, Nan,Liu, Xinhua,&Du, Wei.(2015).Numerical simulation of loop seal for a circulating fluidized bed based on an improved EMMS bubbling model.POWDER TECHNOLOGY,284(NOV),443-451. |
| MLA | Zhao, Meng,et al."Numerical simulation of loop seal for a circulating fluidized bed based on an improved EMMS bubbling model".POWDER TECHNOLOGY 284.NOV(2015):443-451. |
入库方式： OAI收割
来源：过程工程研究所
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