HYDRODYNAMICS STUDY OF GAS-SOLID FLOW PATTERN IN AN INTERNALLY CIRCULATING FLUIDIZED BED WITH A DRAFT TUBE
(0) Circulating fluidized beds (CFB) are widely used in coal combustion and gasification processes.These CFBs suffer from having very tall column as a solids raiser and accompanying additional external circulation of solids through cyclone.To avoid the external circulation accessories a compact internally circulating fluidized bed (IFCB) is developed.ICFB represent a modified spouted fluidized bed with a draft tube inside to avoid problem of gas bypassing.The hydrodynamics of ICFB have studied using combination of experiments and CFD simulations.Solids circulation rate and bed pressure drop were measured using high speed camera and pressure manometers for a wide range of particle sizes and bed heights.3D Two-fluid Eulerian granular flow model was adopted to predict the hydrodynamic behavior of ICFB.Effect of gas velocity, presence of draft tube on solid hold-up distribution, solid circulation pattern and variations in gas bypassing fraction in the ICFB have been investigated with the help of CFD simulations.CFD validation against the experimental data is made.
Ravi Gujjula Narasimha Mangadoddy
Department of Chemical Engineering,Indian Institute of Technology,Hyderabad 502205,India
国际会议
The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)
北京
英文
167-173
2014-05-14（万方平台首次上网日期，不代表论文的发表时间）