Hydrodynamics of a fluidized bed co-combustor for tobacco waste and coal.
Hydrodynamics of a fluidized bed co-combustor for tobacco waste and coal.
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DOI：
10.1016/j.biortech.2012.05.132
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发表时间：
2012-09
影响因子：
11.4
通讯作者：
Kai Zhang;Bangting Yu;Jian Chang;Guiying Wu;Tengda Wang;D. Wen
中科院分区：
文献类型：
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作者：
Kai Zhang;Bangting Yu;Jian Chang;Guiying Wu;Tengda Wang;D. Wen
在截面积为0.3×0.025m2的矩形床内，研究了烟杆（TS）与阳离子交换树脂（煤的替代物）二元混合物的流化特性。草本生物质颗粒的存在及其独特的性质，如低密度和高纵横比导致不同的流化行为。随着TS质量分数从7%增加到20%，观察到三个流化速度，即初始，最小和全流化速度，并经历了四个流体动力学阶段，包括静态，分离，过渡和混合阶段，随着操作气速的增加。结果表明，在现有的鼓泡流化床中，操作气速应在二元混合物最小流化速度的2.0-5.0倍范围内，TS质量分数应小于7%。较高TS分数的夹杂物需要引入中心射流气体以改善混合效果。
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 0.3×0.025m2. 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.