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采用递归图系统研究了流化风速、床存量对双支腿流化床(DL-FB)内气固流动混沌特性的影响规律。DL-FB的宽、深和高分别为0.24、0.04和2.0 m,支腿高为0.16 m,使用粒径范围为0.25～0.28的玻璃珠作为床料。结果表明递归图可用于描述DL-FB内的气固两相流动的混沌特性,且DL-FB内的气固流动较单布风板流化床复杂。DL-FB系统熵随着流化气速的增加呈“M”型曲线变化。DL-FB系统随气速的增加会出现低速颗粒未交换段、低速颗粒交换起始段、颗粒交换段和颗粒悬浮段。床存量对系统熵的影响较大且没有明显规律。DL-FB内的压力脉动包含气泡行为和颗粒交换在半床间交换行为。
The influence of fluidizing velocity and bed stock on the chaos characteristics of gas-solid flow in double-leg fluidized bed (DL-FB) was studied by recursive graph system. The width, depth and height of the DL-FB were 0.24, 0.04 and 2.0 m, respectively, with a leg height of 0.16 m. Glass beads with a particle size range of 0.25 to 0.28 were used as bed material. The results show that the recursive graph can be used to describe the chaotic characteristics of the gas-solid two-phase flow in the DL-FB, and the gas-solid flow in the DL-FB is more complicated than the single-bed wind-bed fluidized bed. DL-FB system entropy with the increase of fluidized gas velocity was “M ” type curve changes. DL-FB system with the increase of gas velocity will appear low-speed particles not exchange section, low-speed particle exchange start section, particle exchange section and particle suspension section. The influence of bed stock on the entropy of the system is larger and there is no obvious law. Pressure pulsations in the DL-FB contain bubble behavior and the exchange of particles between the half-beds.