摘要: |
考虑CFB提升管快速床中因颗粒团聚物的存在而发生的气固相间曳力下滑的现象,建立基于能量最小多尺度方法(EMMS)的曳力模型,并将其与CFD两相流模型相耦合模拟传统等径提升管和新型分区多流域提升管两种不同结构的提升管。结果表明:将EMMS曳力模型耦合CFD双流体模型,可以合理地预测提升管内轴向与径向上的流场分布,实现对提升管内气固两相流动的准确表达;当CFB提升管的结构与操作工况发生变化时须重新寻求更为合适的曳力模型。 |
关键词: 两相流 曳力模型 流态化 分区多流域提升管 |
DOI:10.3969/j.issn.1673-5005.2017.01.024 |
分类号::TE 624 |
文献标识码:A |
基金项目:国家“973”项目(2012CB215006) |
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Development of EMMS-based drag model for multi-regime riser |
DU Yupeng1, YANG Chaohe1, ZHU Di2
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(1.State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China;2.SINOPEC Geophysical Corporation Shengli Branch, Dongying 257086, China)
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Abstract: |
Considering the phenomenon of gas-solid flow caused by the particle clusters in the circulating fluidized bed (CFB) riser, the energy minimum multi-scale method (EMMS)-based drag model was developed in this study. And the drag model was coupled with the two-phase flow model of CFD for simulations of a conventional riser and a novel multi-regime riser. It is found that the developed drag model can reasonably predict the flow distributions on both axial and radial directions, which leads to the correct characterization of the gas-solid flow in the riser. An appropriate drag models is needed when the configuration and operational conditions in CFB riser are changed. |
Key words: two-phase flow drag model fluidization multi-regime riser |