title: Hydrodynamics of a fluidized bed co-combustor for tobacco waste and coal.
abstract: The fluidization characteristics of binary mixtures containing tobacco stem (TS) and cation exchange resin (a substitute for coal) were studied in a rectangular bed with the cross-section area of 0.3 × 0.025 m(2). The presence of herbaceous biomass particles and their unique properties such as low density and high aspect ratio resulted in different fluidization behaviors. Three fluidization velocities, i.e. initial, minimum and full fluidization velocities, were observed as the TS mass fraction increased from 7% to 20%, and four hydrodynamic stages were experienced, including the static, segregation, transition and mixing stages, with increasing operational gas velocities. The results suggest that the operational gas velocity should be in the range of 2.0-5.0 times of the minimum fluidization velocity of the binary mixtures, and less than 7% TS mass fraction should be used in an existing bubbling fluidized bed. Higher TS fraction inclusion requires the introduction of central jet gas to improve the mixing effect.
authors: Center of Chem. Eng. for Clean Energy, North China Electric Power University, Beijing 102206, PR China. kzhang@ncepu.edu.cnkzhang@ncepu.edu.cn
authors: Kai
authors: K
authors: Zhang
authors: Bangting
authors: B
authors: Yu
authors: Jian
authors: J
authors: Chang
authors: Guiying
authors: G
authors: Wu
authors: Tengda
authors: T
authors: Wang
authors: Dongsheng
authors: D
authors: Wen
mesh_terms: D003031:Coal; D003198:Computer Simulation; D003246:Conservation of Energy Resources / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006361:Heating / Q000295:instrumentation*; D017745:Incineration / Q000295:instrumentation*; D007220:Industrial Waste / Q000517:prevention & control*; D008956:Models, Chemical; D012037:Refuse Disposal / Q000295:instrumentation*; D012996:Solutions; D014026:Nicotiana / Q000737:chemistry*
chemical_list: D003031:Coal; D007220:Industrial Waste; D012996:Solutions