首页|期刊导航|热科学学报（英文版）|The Simulation and Experimental Validation on Gas-Solid Two Phase Flow in the Riser of a Dense Fluidized Bed
热科学学报（英文版）2009，Vol.18Issue(2)：137-141,5.DOI:10.1007/s11630-009-0137-y
The Simulation and Experimental Validation on Gas-Solid Two Phase Flow in the Riser of a Dense Fluidized Bed
The Simulation and Experimental Validation on Gas-Solid Two Phase Flow in the Riser of a Dense Fluidized Bed
摘要
Abstract
Gas-solid flow in dense CFB (circulating fluidized bed)) riser under the operating condition, superficial gas 15.5m/s and solid flux 140 kg/m2s using Geldart B particles (sand) was investigated by experiments and CFD (com-putational fuid dynamics) simulation. The overall and local flow characteristics are determined using the axial pressure profiles and solid concentration profiles. The cold experimental results indicate that the axial solid con-centration distribution contains a dilute region towards the up-middle zone and a dense region near the bottom and the top exit zones. The typical core-annulus structure and the back-mixing phenomenon near the wall of the riser can be observed. In addition, owing to the key role of the drag force of gas-solid phase, a revised drag force coefficient, based on the EMMS (energy-minimization multi-scale) model which can depict the heterogeneous character of gas-solid two phase flow, was proposed and coupled into the CFD control equations. In order to fred an appropriate drag force model for the simulation of dense CFB riser, not only the revised drag force model but some other kinds of drag force model were used in the CFD. The flow structure, solid concentration, clusters phenomenon, fluctuation of two phases and axial pressure drop were analyzed. By comparing the experiment with the simulation, the results predicted by the EMMS drag model showed a better agreement with the experi-mental axial average pressure drop and apparent solid volume fraction, which proves that the revised drag force based on the EMMS model is an appropriate model for the dense CFB simulation.关键词
riser/gas-solid flow/drag force/EMMS modelKey words
riser/gas-solid flow/drag force/EMMS model分类
数理科学引用本文复制引用
Xue-yao Wang,Fan Jiang,Xiang Xu,Sheng-dian Wang,Bao-guo Fan,Yun-han Xiao..The Simulation and Experimental Validation on Gas-Solid Two Phase Flow in the Riser of a Dense Fluidized Bed[J].热科学学报（英文版）,2009,18(2):137-141,5.基金项目
The authors are grateful to the supports from the National High Technology Research and Development of China 863 Program (2006AA05A103) and the National Natural Science Foundation of China (No.40501017) （2006AA05A103）
