高通量循环流化床提升管中气固两相流动的研究  

The Research on Gas-solid Flow in High Particle Flux CFB's Riser

作　　者：王嘉昌[1] 王雪瑶[1] 王圣典[1] 徐祥[1] 肖云汉[1] 

机构地区：[1]中国科学院(先进能源动力重点实验室)工程热物理研究所,北京100190

出　　处：《锅炉技术》2010年第1期36-39,59,共5页Boiler Technology

基　　金：国家自然科学基金(40501017);国家863高技术研究发展计划项目(2006AA05A103)

摘　　要：发展清洁煤炭利用、煤炭多联产和IGCC迫切需求研发先进的煤气化技术。循环流化床(CFB)提升管内的气固两相流动对循环流化床气化技术有重要影响。在f 0.187′10 m的冷态实验台上考察密相CFB提升管内气固两相流动。基于能量最小多尺度原理(EMMS)提出了改进的曳力修正系数表达式,并嵌入到双流体模型中,完成了冷态实验台的三维数值模拟。结果展现了CFB提升管内典型的环核结构和壁面颗粒返混现象,同时捕捉到了颗粒团的形成与破裂运动。通过与Gidaspow曳力模型计算结果的比较证实,提出了曳力修正系数可以较好地模拟浓相CFB提升管内的气固两相运动。It is very urgent to develop the advanced pulverized coal gasification technology to satisfy the requirements of coal-based poly-generation and IGCC in China.The flow structure in the CFB（circulating fluidized bed） risers has an important influence on the coal gasification technology.In this paper,experiment study was performed in a cold unit withf 0.187′10 m.The structure-dependent energy-minimization multi-scale（EMMS） model based on the heterogenerious character of gas-solid flow is applied in the paper and a revised drag force model based on the EMMS is proposed.Two-fluid model is used to calculate the experimental riser in a 3D bench-scale.The typical core-annulus structure and the back-mixing phenomenon near the wall of the riser is observed.The assembly and fragmentation processes of clusters are captured.By comparing with the Gidaspow drag model,the revised drag model based on EMMS shows better consistent with the experimental data.

关 键 词：气固两相流 CFB EMMS模型 三维仿真 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]